WO2003083818A1 - Device and method of operation for automatic control of backlight - Google Patents

Device and method of operation for automatic control of backlight Download PDF

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Publication number
WO2003083818A1
WO2003083818A1 PCT/JP2003/004014 JP0304014W WO03083818A1 WO 2003083818 A1 WO2003083818 A1 WO 2003083818A1 JP 0304014 W JP0304014 W JP 0304014W WO 03083818 A1 WO03083818 A1 WO 03083818A1
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WO
WIPO (PCT)
Prior art keywords
led
backlight
level
light
user
Prior art date
Application number
PCT/JP2003/004014
Other languages
French (fr)
Inventor
Paul H. Dietz
Original Assignee
Mitsubishi Denki Kabushiki Kaisha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Denki Kabushiki Kaisha filed Critical Mitsubishi Denki Kabushiki Kaisha
Priority to JP2003581160A priority Critical patent/JP2005521995A/en
Publication of WO2003083818A1 publication Critical patent/WO2003083818A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/22—Illumination; Arrangements for improving the visibility of characters on dials
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/144—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light being ambient light
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/04—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
    • G09G3/06—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources
    • G09G3/12—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources using electroluminescent elements
    • G09G3/14—Semiconductor devices, e.g. diodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00—Legends
    • H01H2219/036—Light emitting elements
    • H01H2219/038—Light emitting elements ambient light dependent
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
    • H04W52/0267—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by controlling user interface components
    • H04W52/027—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by controlling user interface components by controlling a display operation or backlight unit
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • This invention relates generally to light emitting diodes, and more particularly to using light emitting diodes as light sensors as well as light emitters.
  • Remote controls, personal digital assistants (PDAs) , pagers, cell phones and other handheld devices often include a backlight for display, keys, and control buttons so that the devices can be used in dark environments.
  • PDAs personal digital assistants
  • the user must press a button, open a lid, or take some other sort of action to turn on the backlight.
  • locating the backlight actuation mechanism can be difficult to do in the dark.
  • Backlights are also extensively used in passive display panels that are subject to various levels of ambient light, for example, vehicle and plane instrument panels.
  • the automatic backlight turns on before the user hits a key, but only in dark lighting conditions . It is inexpensive, and uses very little power.
  • a capacitive proximity sensor detects active handling of the device, and the backlight itself is also used as a light sensor.
  • the circuit requires only a single additional capacitor and three I/O pins of a typical microprocessor-based systems (such as remote controls) . Because the system also uses the backlight LED as a sensor, devices can often be upgraded to include this feature without changing the existing packaging.
  • Figure 1 is a schematic of a capacitance measuring circuit
  • Figure 2 is schematic of a prior art light emitter circuit
  • Figure 3 is a schematic of an LED emitter/detector circuit according to the invention
  • Figures 4a-c shows the circuit of Figure 3 operating in light, reverse bias, and discharge modes, respectively; and Figure 5 is a flow diagram of a process operating an automatic backlight according to the invention.
  • FIG. 1 shows a basic capacitance measurement circuit 100 used by the invention.
  • the circuit uses two standard digital I/O pins 101-102 of a standard microprocessor, e.g., a PIC16C series microchip from Microchip Technology Inc., plus an integrating capacitor Ci 103 to measure capacitive coupling C US er 104 to a user 105 handling a device incorporating the circuit 100.
  • a standard microprocessor e.g., a PIC16C series microchip from Microchip Technology Inc.
  • Ci 103 to measure capacitive coupling C US er 104 to a user 105 handling a device incorporating the circuit 100.
  • pins I/Oi and I/0 2 101-102 are initially set to output low, discharging the capacitors.
  • C ⁇ 103 is set to input, and C use r 104 is set to output high. This charges Cuser to the supply voltage.
  • I/Oi 101 is set to input and I/0 2 102 is set to output low. This causes Ci lOland C U3er 104 to charge share. If C ⁇ > C user+ , then this causes a small increase in the charge on Ci 103.
  • a sensitive handling sensor By placing sensing electrodes on a printed circuit board to form a Cuser capacitance that varies with handling and using the above described circuit and process, a sensitive handling sensor is constructed. To save power, the microprocessor is left in sleep mode the majority of the time, waking up periodically to perform this quickmeasurement to determine handling state . For a typical remote control microprocessor, this operation draws microwatts of power, and thus is suitable for continuous handling sampling. This process is described in greater detail below with reference to Figure 5.
  • Another sensing technology for an automatic backlight for a device uses a light sensor . It is possible to use a cadmium sulfide (CdS) cell, or some other separate photo-detector. However, a separate detector typically requires a modification to the device's case, as well as a mechanism to channel light to the sensor in a way that is not obscured by ordinary handling.
  • CdS cadmium sulfide
  • the backlight LED itself as the light sensor. This requires only the use of an additional I/O pin on the microprocessor, but no other extra components.
  • the backlight LED is already ideally optically coupled to an area of the device that is to be illuminated.
  • LEDs are photodiodes, and the ability of LEDs to be used as detectors is well known, see “Siliconnections : Coming of Age in the Electronic Era, " ForrestMimms, 1985. However, for unknown reasons, this ability to use an LED as a light detector has rarely been exploited in prior art devices. There, LEDs are almost universally used only as light emitters. Possibly the problem has been the lack of a simple circuit that can easily switch between emitting and detecting.
  • Figure 2 shows a typical prior art LED emitter circuit 200.
  • An I/O pin 201 of a microprocessor controller 200 is used to sink current throughanLED202 with a resistor 203 to limit the current .
  • FIG. 3 shows an LED emitter/detector circuit according to the invention.
  • the Led 302 and resister 303 are coupled in series between two I/O pins 301 of the microprocessor 300. Now both ends of the LED/resistor circuit are driven by the microprocessor.
  • Figures 4a-c show how this circuit can operate in three modes, "light, " "reverse bias, “ and “discharge, “ respectively.
  • the LED operates conventionally and emits light.
  • reverse bias mode the normal emittingpolarities are switched to reverse bias the diode junction.
  • an optically generated photocurrent can discharge the junction at a rate proportional to the amount of received light.
  • the capacitive discharge can be measured as described above.
  • the voltage on the input pin crosses an input threshold T. By timing how long this takes, a high-resolution measurement of the light level is made.
  • the circuit according to the invention requires no addition components, and draws extremely little power during sensing. By switching quickly between emitting and sensing modes, the LED can appear to be continuously emitting, even though it is briefly switching to sensing at periodic intervals.
  • the light sensor circuit of Figure 4 can be used alone or in combination with the handling sensor circuit of Figure 1 to construct an automatic backlight for handheld devices .
  • the basic process repeatedly samples 510 the handling sensor. If handling is detected, then sample 520 the light sensor. If the sensed level of ambient light is less than a predetermined threshold, then adjust the backlight level accordingly. In a simple case, the light is either turned on or off . Alternatively, the level of backlight emitted is some function of the measured level of ambient light. If the device has not been handled for a predetermined time interval, then turn off the backlight and return to the normal sampling state. This process has an interesting advantage. If the device is not being actively handled, then the capacitive coupling with the user does not change, and the backlight turns off automatically.
  • the device is a remote control
  • the user is watching TV holding the remote control in a steady state .
  • the backlight turns off.
  • the backlight turns on again only if the ambient light is less than the predetermined threshold.
  • the handling sensor and the light sensor can serve other purposes as well .
  • the handling sensor can be used to immediately transmit a "stand-by" signal to a controlleddevice to enable the controlled device to prepare for a request from the user.
  • a controlleddevice For example, projection TVs and some other type of appliances have fairly long warm-up times. Anticipating that a user is likely to turn on power can allow these appliances to preemptively begin the start-up process and thus decrease the apparent startup time from the users perspective.
  • the light sensor can also be used to measure the relative amount of ambient light, and automatically adjusting the brightness level of backlight to match the level of ambient light.

Abstract

An automatic backlight turns on before a user hits a key, but only in dark lighting conditions. A capacitive proximity sensor detects active handling of the device and the backlight itself is used as a light sensor. The circuit requires only a single additional capacitor and three free I/O pins to implement on typical microprocessor-based systems (such as remote controls). Because the system uses the current backlight LED as a sensor, devices can often be upgraded to include this feature without changing the existing packaging.

Description

DESCRIPTION DEVICE AND METHOD OF OPERATION FOR AUTOMATIC CONTROL OF BACKLIGHT
Technical Field
This invention relates generally to light emitting diodes, and more particularly to using light emitting diodes as light sensors as well as light emitters.
Background Art
Remote controls, personal digital assistants (PDAs) , pagers, cell phones and other handheld devices often include a backlight for display, keys, and control buttons so that the devices can be used in dark environments. Generally, the user must press a button, open a lid, or take some other sort of action to turn on the backlight. However, locating the backlight actuation mechanism can be difficult to do in the dark. Backlights are also extensively used in passive display panels that are subject to various levels of ambient light, for example, vehicle and plane instrument panels.
Some conventional mechanisms turn on the backlight by any user action. This provides multiple ways to activate the backlight, but the user must be careful not to hit an undesirable function key in the dark by mistake. Worse still, this mechanism turns on the backlight even in bright environments, when it is not needed. Because battery life is critical in handheld devices, some designers have added light sensors to prevent actuation in bright light conditions, but this adds complexity and cost.
Anotherprior artmechanismuses a.combination of accelerometers, capacitive touch sensors, and infrared proximity sensors to determine ahandling state of amobilephone to turnon abacklight, see Hinckley et al., "Toward More Sensitive Mobile Phones," Proceedings of ACM UIST, 2001. Not only are these components expensive, they also draw a substantial amount of power and require significant tooling changes for the design of the device' s enclosure . A simpler mechanism uses a simple capacitive proximity sensor as described in U.S. Patent Application Sn. 09/864, 812, "Real-Time Buffering for Telephone Handsets, " filed by Dietz et al . on May 24, 2001, but with a slight modification to detect motion rather than simply crossing a threshold.
Disclosure of Invention
Unlike conventional systems, the automatic backlight turns on before the user hits a key, but only in dark lighting conditions . It is inexpensive, and uses very little power. A capacitive proximity sensor detects active handling of the device, and the backlight itself is also used as a light sensor. The circuit requires only a single additional capacitor and three I/O pins of a typical microprocessor-based systems (such as remote controls) . Because the system also uses the backlight LED as a sensor, devices can often be upgraded to include this feature without changing the existing packaging.
Brief Description of Drawings
Figure 1 is a schematic of a capacitance measuring circuit; Figure 2 is schematic of a prior art light emitter circuit; Figure 3 is a schematic of an LED emitter/detector circuit according to the invention;
Figures 4a-c shows the circuit of Figure 3 operating in light, reverse bias, and discharge modes, respectively; and Figure 5 is a flow diagram of a process operating an automatic backlight according to the invention.
Best Mode for Carrying Out the Invention
Capacitance Measuring Circuit
Figure 1 shows a basic capacitance measurement circuit 100 used by the invention. The circuit uses two standard digital I/O pins 101-102 of a standard microprocessor, e.g., a PIC16C series microchip from Microchip Technology Inc., plus an integrating capacitor Ci 103 to measure capacitive coupling CUSer 104 to a user 105 handling a device incorporating the circuit 100.
Measuring Process To make the measurement, pins I/Oi and I/02101-102 are initially set to output low, discharging the capacitors. Next, Cτ 103 is set to input, and Cuser 104 is set to output high. This charges Cuser to the supply voltage. Then, I/Oi 101 is set to input and I/02 102 is set to output low. This causes Ci lOland CU3er 104 to charge share. If CΣ > Cuser+, then this causes a small increase in the charge on Ci 103. Repeating this cycle of charging Cuser and sharing with Ci slowly charges up Ci 101, in exponentially decreasing steps proportional to CU3er/ Cτ - When CU3er is charging, I/02 is an input, and can be used to determine when a charge level on Ci has caused the input to cross an input threshold T. By counting how many charge-share cycles are required to cross the input threshold T, a high-resolution measurement of the capacitive coupling Cuser is acquired.
Given this basic capacitance measurement circuit 100, it is now possible to detect capacitive change in a robust fashion, even with a small amount of noise, and slow component drift. After each measurement, the absolute difference from the previous measurement is low-pass filtered via a single pole filter, and the output of this filter is checked to see if it exceeds the threshold T.
By placing sensing electrodes on a printed circuit board to form a Cuser capacitance that varies with handling and using the above described circuit and process, a sensitive handling sensor is constructed. To save power, the microprocessor is left in sleep mode the majority of the time, waking up periodically to perform this quickmeasurement to determine handling state . For a typical remote control microprocessor, this operation draws microwatts of power, and thus is suitable for continuous handling sampling. This process is described in greater detail below with reference to Figure 5.
Light Sensing
Another sensing technology for an automatic backlight for a device uses a light sensor . It is possible to use a cadmium sulfide (CdS) cell, or some other separate photo-detector. However, a separate detector typically requires a modification to the device's case, as well as a mechanism to channel light to the sensor in a way that is not obscured by ordinary handling.
Instead, it is possible to use the backlight LED itself as the light sensor. This requires only the use of an additional I/O pin on the microprocessor, but no other extra components. As an advantage, the backlight LED is already ideally optically coupled to an area of the device that is to be illuminated.
LEDs are photodiodes, and the ability of LEDs to be used as detectors is well known, see "Siliconnections : Coming of Age in the Electronic Era, " ForrestMimms, 1985. However, for unknown reasons, this ability to use an LED as a light detector has rarely been exploited in prior art devices. There, LEDs are almost universally used only as light emitters. Possibly the problem has been the lack of a simple circuit that can easily switch between emitting and detecting.
Figure 2 shows a typical prior art LED emitter circuit 200. An I/O pin 201 of a microprocessor controller 200 is used to sink current throughanLED202 with a resistor 203 to limit the current .
Figure 3 shows an LED emitter/detector circuit according to the invention. Here, the Led 302 and resister 303 are coupled in series between two I/O pins 301 of the microprocessor 300. Now both ends of the LED/resistor circuit are driven by the microprocessor.
Figures 4a-c show how this circuit can operate in three modes, "light, " "reverse bias, " and "discharge, " respectively. In the light mode, the LED operates conventionally and emits light. In reverse bias mode, the normal emittingpolarities are switched to reverse bias the diode junction. By releasing one end in dischargemode, i.e., setting that end tobe an input, an optically generated photocurrent can discharge the junction at a rate proportional to the amount of received light. The capacitive discharge can be measured as described above. At some point, the voltage on the input pin crosses an input threshold T. By timing how long this takes, a high-resolution measurement of the light level is made.
The circuit according to the invention requires no addition components, and draws extremely little power during sensing. By switching quickly between emitting and sensing modes, the LED can appear to be continuously emitting, even though it is briefly switching to sensing at periodic intervals.
Automatic Backlight
As shown in Figure 5, the light sensor circuit of Figure 4 can be used alone or in combination with the handling sensor circuit of Figure 1 to construct an automatic backlight for handheld devices .
The basic process repeatedly samples 510 the handling sensor. If handling is detected, then sample 520 the light sensor. If the sensed level of ambient light is less than a predetermined threshold, then adjust the backlight level accordingly. In a simple case, the light is either turned on or off . Alternatively, the level of backlight emitted is some function of the measured level of ambient light. If the device has not been handled for a predetermined time interval, then turn off the backlight and return to the normal sampling state. This process has an interesting advantage. If the device is not being actively handled, then the capacitive coupling with the user does not change, and the backlight turns off automatically. This is useful in the case where the user is just holding the device, for example, the device is a remote control, and the user is watching TV holding the remote control in a steady state . As long as the user does not move his or her hand relative to the remote control, no "handling" is detected, and the backlight turns off. As soon as the user moves to use the remote control, the backlight turns on again only if the ambient light is less than the predetermined threshold.
Shipping
For shipping the device, it is possible that a situation can arise where the device is constantly being jostled relative to conductivepackingmaterials .This couldactivate thebacklight . Therefore, it is useful to specifically look for this case of extended "handling" and purposely raise the handling time interval threshold to preserve battery life.
Standby
It should be noted that the handling sensor and the light sensor can serve other purposes as well . In the case of a remote control, the handling sensor can be used to immediately transmit a "stand-by" signal to a controlleddevice to enable the controlled device to prepare for a request from the user. For example, projection TVs and some other type of appliances have fairly long warm-up times. Anticipating that a user is likely to turn on power can allow these appliances to preemptively begin the start-up process and thus decrease the apparent startup time from the users perspective.
The light sensor can also be used to measure the relative amount of ambient light, and automatically adjusting the brightness level of backlight to match the level of ambient light.
Although the invention has been described by way of examples of preferred embodiments, it is to be understood that various other adaptations andmodifications maybe made within the spirit and scope of the invention. Therefore, it is the object of the appended claims to cover all such variations and modifications as come within the true spirit and scope of the invention.

Claims

1. An automatic backlight, comprising: an LED coupled in series with a resistor; a micro-processor having a first I/O pin connected to the LED and a second I/O pin coupled to the resistor; means for periodically driving the LED in forward bias to emit light; means for periodically driving the LED in reverse bias; means for discharging the LED after driving the LED in reverse bias to measure a level of ambient light; and means foradjustinga level ofthe emitted light according to a level of measured ambient light.
2. The automatic backlight of claim 1 wherein the level of emitted light is on or off.
3. The automatic backlight of claim 1 further comprising: means for measuring a capacitive coupling with a user, and only driving the LED when there is a capacitive coupling with the user.
4. The automatic backlight of claim 1 further comprising: means for measuring a capacitive coupling with a user.
5. The automatic backlight of claim 4 wherein the LED is driven only when the capacitive coupling with the user exceeds a predetermined threshold.
6. The automatic backlight of claim 4 wherein a standby signal is transmitted to a controlled device when the capacitive coupling with the user exceeds a threshold.
7. A method for operating an automatic backlight, comprising: coupling an LED in series with a resistor; connecting a first I/O pin of a microprocessor to the LED and a second I/O pin to the resistor; periodically driving the LED in forward bias to emit light; periodically driving the LED in reverse bias; discharging the LED after driving the LED in reverse bias to measure a level of ambient light; and adjusting a level of the emitted light according to a level of measured ambient light.
PCT/JP2003/004014 2002-04-03 2003-03-28 Device and method of operation for automatic control of backlight WO2003083818A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003581160A JP2005521995A (en) 2002-04-03 2003-03-28 Automatic backlight and method for operating automatic backlight

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/115,299 US6664744B2 (en) 2002-04-03 2002-04-03 Automatic backlight for handheld devices
US10/115,299 2002-04-03

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1701331A1 (en) * 2005-03-07 2006-09-13 Research In Motion Limited System and method for adjusting a backlight for a display for an electronic device
EP2482273A1 (en) * 2011-01-28 2012-08-01 Broadcom Corporation Apparatus and method for using an LED for backlighting and ambient light sensing
US8575845B2 (en) 2011-12-14 2013-11-05 Texas Instruments Incorporated Method and apparatus to measure light intensity
DE102014005927A1 (en) 2014-04-24 2015-04-09 Diehl Aerospace Gmbh Illuminating device and method with the illuminating device
US9854975B2 (en) 2006-06-12 2018-01-02 Koninklijke Philips N.V. Skin monitoring device, method of monitoring the skin, monitoring device, method of irradiating the skin, and use of an OLED
CN110278642A (en) * 2019-06-25 2019-09-24 珠海格力电器股份有限公司 A kind of controller backlight control system and method
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Families Citing this family (209)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002135374A (en) * 2000-10-26 2002-05-10 Nec Corp Mobile phone, control method for the mobile phone, and recording medium for recording its control program
KR100940530B1 (en) * 2003-01-17 2010-02-10 삼성전자주식회사 Silicon optoelectronic device manufacturing method and Silicon optoelectronic device manufactured by thereof and Image input and/or output apparatus applied it
TW575849B (en) * 2002-01-18 2004-02-11 Chi Mei Optoelectronics Corp Thin film transistor liquid crystal display capable of adjusting its light source
US6870148B2 (en) * 2002-09-20 2005-03-22 Mitsubishi Electric Research Laboratories, Inc. LED with controlled capacitive discharge for photo sensing
KR100464321B1 (en) * 2002-11-20 2004-12-31 삼성전자주식회사 Silicon optoelectronic device and image input/output apparatus applying it
FI114950B (en) * 2003-06-24 2005-01-31 Nokia Corp Method for visualizing a terminal's input and display portion and the terminal
US7042341B2 (en) * 2003-08-12 2006-05-09 Overhead Door Corporation Device including light emitting diode as light sensor and light source
US7187139B2 (en) 2003-09-09 2007-03-06 Microsemi Corporation Split phase inverters for CCFL backlight system
US7183727B2 (en) * 2003-09-23 2007-02-27 Microsemi Corporation Optical and temperature feedbacks to control display brightness
US7286767B2 (en) * 2003-09-30 2007-10-23 Intel Corporation Optical transceiver over single communication link
KR100658042B1 (en) * 2003-11-06 2006-12-15 주식회사 신창전기 LED combined with resistence
CN1910894A (en) * 2004-01-15 2007-02-07 三菱电机株式会社 Key system, key device and information apparatus
GB0402640D0 (en) * 2004-02-06 2004-03-10 Pelikon Ltd Ambient light sensor
US7468722B2 (en) 2004-02-09 2008-12-23 Microsemi Corporation Method and apparatus to control display brightness with ambient light correction
GB2411278B (en) * 2004-02-20 2008-05-07 Pelikon Ltd Improved displays
US10575376B2 (en) 2004-02-25 2020-02-25 Lynk Labs, Inc. AC light emitting diode and AC LED drive methods and apparatus
WO2011143510A1 (en) 2010-05-12 2011-11-17 Lynk Labs, Inc. Led lighting system
US10499465B2 (en) 2004-02-25 2019-12-03 Lynk Labs, Inc. High frequency multi-voltage and multi-brightness LED lighting devices and systems and methods of using same
EP1730623A2 (en) * 2004-03-22 2006-12-13 Koninklijke Philips Electronics N.V. Method and apparatus for power management in mobile terminals
WO2005099316A2 (en) 2004-04-01 2005-10-20 Microsemi Corporation Full-bridge and half-bridge compatible driver timing schedule for direct drive backlight system
US20050222801A1 (en) 2004-04-06 2005-10-06 Thomas Wulff System and method for monitoring a mobile computing product/arrangement
US7755595B2 (en) * 2004-06-07 2010-07-13 Microsemi Corporation Dual-slope brightness control for transflective displays
GB2415769A (en) 2004-06-30 2006-01-04 Nokia Corp Portable device having multicolour illumination
US8381135B2 (en) 2004-07-30 2013-02-19 Apple Inc. Proximity detector in handheld device
US7498951B2 (en) * 2004-10-18 2009-03-03 Ixi Mobile (R &D), Ltd. Motion sensitive illumination system and method for a mobile computing device
EP1811452B1 (en) * 2004-11-08 2010-04-21 Sony Corporation Information processing system and information processing device
KR100612875B1 (en) * 2004-11-24 2006-08-14 삼성전자주식회사 Silicon optoelectronic device manufacturing method and Silicon optoelectronic device manufactured by thereof and Image input and/or output apparatus applied it
KR20060059327A (en) * 2004-11-27 2006-06-01 삼성전자주식회사 Silicon optoelectronic device manufacturing method and silicon optoelectronic device manufactured by thereof and image input and/or output apparatus applied it
US7486044B2 (en) * 2004-11-30 2009-02-03 Motorola, Inc. Light detection power system and method for same
DE102004060199A1 (en) * 2004-12-14 2006-06-29 Schreiner Group Gmbh & Co. Kg brightness sensor
US7627330B2 (en) * 2005-01-31 2009-12-01 Research In Motion Limited Mobile electronic device having a geographical position dependent light and method and system for achieving the same
TW200638332A (en) * 2005-04-29 2006-11-01 Benq Corp Electronic appliance capable of adjusting luminance according to brightness of its environment
CN1857166B (en) * 2005-04-30 2010-09-08 Ge医疗系统环球技术有限公司 Ultrasonic diagnostic device
JP4338140B2 (en) * 2005-05-12 2009-10-07 株式会社 日立ディスプレイズ Touch panel integrated display device
JP4823568B2 (en) * 2005-05-23 2011-11-24 三菱電機株式会社 Planar light source device and display device using the same
JP4718240B2 (en) * 2005-05-24 2011-07-06 日東光学株式会社 Data communication apparatus and electronic device
EP1748307A1 (en) * 2005-07-25 2007-01-31 Research In Motion Limited Shared light pipe for message Indicator and light sensor of ambient light
US7352930B2 (en) * 2005-07-25 2008-04-01 Research In Motion Limited Shared light pipe for a message indicator and light sensor
US7822513B2 (en) * 2005-07-27 2010-10-26 Symbol Technologies, Inc. System and method for monitoring a mobile computing product/arrangement
WO2007031043A1 (en) * 2005-09-16 2007-03-22 Siemens Aktiengesellschaft Electrical field device having a display apparatus
US7728316B2 (en) * 2005-09-30 2010-06-01 Apple Inc. Integrated proximity sensor and light sensor
US7714265B2 (en) 2005-09-30 2010-05-11 Apple Inc. Integrated proximity sensor and light sensor
US7633076B2 (en) 2005-09-30 2009-12-15 Apple Inc. Automated response to and sensing of user activity in portable devices
US7701434B2 (en) * 2005-10-31 2010-04-20 Research In Motion Limited Automatic screen and keypad brightness adjustment on a mobile handheld electronic device
US20080258999A1 (en) * 2005-12-22 2008-10-23 Koninklijke Philips Electronics N.V. Chameleon Glasses
US7958355B2 (en) * 2006-03-01 2011-06-07 Microsoft Corporation Keytote component
US7936878B2 (en) * 2006-04-10 2011-05-03 Honeywell International Inc. Secure wireless instrumentation network system
US20070248232A1 (en) * 2006-04-10 2007-10-25 Honeywell International Inc. Cryptographic key sharing method
US7825891B2 (en) 2006-06-02 2010-11-02 Apple Inc. Dynamic backlight control system
US8594742B2 (en) * 2006-06-21 2013-11-26 Symbol Technologies, Inc. System and method for monitoring a mobile device
US7569998B2 (en) 2006-07-06 2009-08-04 Microsemi Corporation Striking and open lamp regulation for CCFL controller
WO2008044171A2 (en) * 2006-10-11 2008-04-17 Koninklijke Philips Electronics N.V. Led based luminaire and lighting device
CN101558588A (en) * 2006-11-30 2009-10-14 皇家飞利浦电子股份有限公司 Intrinsic flux sensing
US8006002B2 (en) 2006-12-12 2011-08-23 Apple Inc. Methods and systems for automatic configuration of peripherals
US8031164B2 (en) * 2007-01-05 2011-10-04 Apple Inc. Backlight and ambient light sensor system
US8698727B2 (en) 2007-01-05 2014-04-15 Apple Inc. Backlight and ambient light sensor system
US7957762B2 (en) * 2007-01-07 2011-06-07 Apple Inc. Using ambient light sensor to augment proximity sensor output
US8693877B2 (en) 2007-03-09 2014-04-08 Apple Inc. Integrated infrared receiver and emitter for multiple functionalities
KR101618582B1 (en) * 2007-04-20 2016-05-09 코닌클리케 필립스 엔.브이. Lighting device with a led used for sensing
US9455783B2 (en) 2013-05-06 2016-09-27 Federal Law Enforcement Development Services, Inc. Network security and variable pulse wave form with continuous communication
US11265082B2 (en) 2007-05-24 2022-03-01 Federal Law Enforcement Development Services, Inc. LED light control assembly and system
US9100124B2 (en) 2007-05-24 2015-08-04 Federal Law Enforcement Development Services, Inc. LED Light Fixture
GB2458095A (en) * 2007-06-15 2009-09-09 Sharp Kk Solid state illumination system with elements employed as both light source and light sensor
US11297705B2 (en) 2007-10-06 2022-04-05 Lynk Labs, Inc. Multi-voltage and multi-brightness LED lighting devices and methods of using same
US11317495B2 (en) 2007-10-06 2022-04-26 Lynk Labs, Inc. LED circuits and assemblies
US7960682B2 (en) 2007-12-13 2011-06-14 Apple Inc. Display device control based on integrated ambient light detection and lighting source characteristics
DE202008002020U1 (en) * 2008-02-13 2009-03-05 Steca Elektronik Gmbh Electronic switch
US20090218957A1 (en) * 2008-02-29 2009-09-03 Nokia Corporation Methods, apparatuses, and computer program products for conserving power in mobile devices
US8082455B2 (en) * 2008-03-27 2011-12-20 Echostar Technologies L.L.C. Systems and methods for controlling the power state of remote control electronics
US9520743B2 (en) * 2008-03-27 2016-12-13 Echostar Technologies L.L.C. Reduction of power consumption in remote control electronics
US8009054B2 (en) 2008-04-16 2011-08-30 Echostar Technologies L.L.C. Systems, methods and apparatus for adjusting a low battery detection threshold of a remote control
TWI397898B (en) 2008-04-22 2013-06-01 Htc Corp Portable electronic apparatus and backlight control method thereof
US20090276700A1 (en) * 2008-04-30 2009-11-05 Nokia Corporation Method, apparatus, and computer program product for determining user status indicators
US7907060B2 (en) * 2008-05-08 2011-03-15 Echostar Technologies L.L.C. Systems, methods and apparatus for detecting replacement of a battery in a remote control
US20090303097A1 (en) * 2008-06-09 2009-12-10 Echostar Technologies Llc Systems, methods and apparatus for changing an operational mode of a remote control
KR101322137B1 (en) * 2008-06-24 2013-10-25 엘지디스플레이 주식회사 Liquid Crystal Display
CN101621586B (en) * 2008-06-30 2012-10-03 宏达国际电子股份有限公司 Handheld device and power-saving method
US8305249B2 (en) 2008-07-18 2012-11-06 EchoStar Technologies, L.L.C. Systems and methods for controlling power consumption in electronic devices
US8498541B2 (en) * 2008-07-31 2013-07-30 Finisar Corporation Backdoor diagnostic communication to transceiver module
US8861972B2 (en) * 2008-08-28 2014-10-14 Finisar Corporation Combination network fiber connector and light pipe
US8687966B2 (en) * 2008-08-28 2014-04-01 Finisar Corporation Fiber optic transceiver module with optical diagnostic data output
US8837950B2 (en) * 2008-08-28 2014-09-16 Finisar Corporation Accessing transceiver link information from host interface
US8773336B2 (en) 2008-09-05 2014-07-08 Ketra, Inc. Illumination devices and related systems and methods
US8179787B2 (en) * 2009-01-27 2012-05-15 Smsc Holding S.A.R.L. Fault tolerant network utilizing bi-directional point-to-point communications links between nodes
US8456092B2 (en) 2008-09-05 2013-06-04 Ketra, Inc. Broad spectrum light source calibration systems and related methods
US20120001567A1 (en) * 2009-09-30 2012-01-05 Firefly Green Technologies, Inc. Lighting Control System
US9276766B2 (en) * 2008-09-05 2016-03-01 Ketra, Inc. Display calibration systems and related methods
US8471496B2 (en) 2008-09-05 2013-06-25 Ketra, Inc. LED calibration systems and related methods
US10210750B2 (en) 2011-09-13 2019-02-19 Lutron Electronics Co., Inc. System and method of extending the communication range in a visible light communication system
US8521035B2 (en) * 2008-09-05 2013-08-27 Ketra, Inc. Systems and methods for visible light communication
US9509525B2 (en) * 2008-09-05 2016-11-29 Ketra, Inc. Intelligent illumination device
US8886047B2 (en) * 2008-09-05 2014-11-11 Ketra, Inc. Optical communication device, method and system
US8674913B2 (en) 2008-09-05 2014-03-18 Ketra, Inc. LED transceiver front end circuitry and related methods
US20100079426A1 (en) * 2008-09-26 2010-04-01 Apple Inc. Spatial ambient light profiling
US8466864B2 (en) * 2008-10-08 2013-06-18 Dell Products, Lp Grayscale-based field-sequential display for low power operation
US8093839B2 (en) 2008-11-20 2012-01-10 Microsemi Corporation Method and apparatus for driving CCFL at low burst duty cycle rates
US8669944B2 (en) * 2008-12-15 2014-03-11 Sony Corporation Touch sensitive displays with layers of sensor plates providing capacitance based proximity sensing and related touch panels
US20100164745A1 (en) * 2008-12-29 2010-07-01 Microsoft Corporation Remote control device with multiple active surfaces
US8324830B2 (en) * 2009-02-19 2012-12-04 Microsemi Corp.—Analog Mixed Signal Group Ltd. Color management for field-sequential LCD display
US8134475B2 (en) * 2009-03-16 2012-03-13 Echostar Technologies L.L.C. Backlighting remote controls
US8890773B1 (en) 2009-04-01 2014-11-18 Federal Law Enforcement Development Services, Inc. Visible light transceiver glasses
US8928227B2 (en) 2009-08-23 2015-01-06 Thomas John Padula Light emitting bio-mimicry device
US20110069967A1 (en) * 2009-09-24 2011-03-24 Stephen Howard Culpepper Standardized Identification of Pluggable Optics
JP2011170834A (en) * 2010-01-19 2011-09-01 Sony Corp Information processing apparatus, operation prediction method, and operation prediction program
JP2011150413A (en) * 2010-01-19 2011-08-04 Sony Corp Information processing apparatus, method and program for inputting operation
JP2011150414A (en) * 2010-01-19 2011-08-04 Sony Corp Information processing apparatus, method and program for determining operation input
JP5636678B2 (en) * 2010-01-19 2014-12-10 ソニー株式会社 Display control apparatus, display control method, and display control program
DE202010003326U1 (en) * 2010-03-08 2011-08-26 Deltron Elektronische Systeme Gmbh Optical signal transmission
US8494374B2 (en) * 2010-06-14 2013-07-23 Streamlight, Inc. Portable light providing illumination and data
US8641470B2 (en) 2010-09-20 2014-02-04 Disney Enterprises, Inc. Systems and methods to communicate and control actions using light emitting diodes
US9386668B2 (en) 2010-09-30 2016-07-05 Ketra, Inc. Lighting control system
USRE49454E1 (en) 2010-09-30 2023-03-07 Lutron Technology Company Llc Lighting control system
US8233803B2 (en) 2010-09-30 2012-07-31 Transmitive, LLC Versatile remote control device and system
FR2971066B1 (en) 2011-01-31 2013-08-23 Nanotec Solution THREE-DIMENSIONAL MAN-MACHINE INTERFACE.
US8629623B2 (en) 2011-04-28 2014-01-14 Echostar Technologies L.L.C. Smart illumination for electronic devices
US8749172B2 (en) 2011-07-08 2014-06-10 Ketra, Inc. Luminance control for illumination devices
WO2013026053A1 (en) 2011-08-18 2013-02-21 Lynk Labs, Inc. Devices and systems having ac led circuits and methods of driving the same
US9143126B2 (en) 2011-09-22 2015-09-22 Ford Global Technologies, Llc Proximity switch having lockout control for controlling movable panel
US9477263B2 (en) 2011-10-27 2016-10-25 Apple Inc. Electronic device with chip-on-glass ambient light sensors
US10112556B2 (en) 2011-11-03 2018-10-30 Ford Global Technologies, Llc Proximity switch having wrong touch adaptive learning and method
US8547036B2 (en) 2011-11-20 2013-10-01 Available For Licensing Solid state light system with broadband optical communication capability
US9247597B2 (en) 2011-12-02 2016-01-26 Lynk Labs, Inc. Color temperature controlled and low THD LED lighting devices and systems and methods of driving the same
US9582083B2 (en) 2011-12-22 2017-02-28 Apple Inc. Directional light sensors
TWI479360B (en) * 2011-12-23 2015-04-01 Capella Microsystems Corp Optical sensing device capable of switching operation mode and control method thereof
US9183779B2 (en) * 2012-02-23 2015-11-10 Broadcom Corporation AMOLED light sensing
US20130221851A1 (en) * 2012-02-28 2013-08-29 Texas Instruments Incorporated Sensorless LED Light Detection
TWI467935B (en) * 2012-03-06 2015-01-01 Ind Tech Res Inst Visible light communication transceiver and system
US8873965B2 (en) * 2012-04-10 2014-10-28 Disney Enterprises, Inc. Visible light communication with flickering prevention
US9197206B2 (en) 2012-04-11 2015-11-24 Ford Global Technologies, Llc Proximity switch having differential contact surface
US9660644B2 (en) 2012-04-11 2017-05-23 Ford Global Technologies, Llc Proximity switch assembly and activation method
US9568527B2 (en) 2012-04-11 2017-02-14 Ford Global Technologies, Llc Proximity switch assembly and activation method having virtual button mode
US9831870B2 (en) 2012-04-11 2017-11-28 Ford Global Technologies, Llc Proximity switch assembly and method of tuning same
US9559688B2 (en) 2012-04-11 2017-01-31 Ford Global Technologies, Llc Proximity switch assembly having pliable surface and depression
US9531379B2 (en) 2012-04-11 2016-12-27 Ford Global Technologies, Llc Proximity switch assembly having groove between adjacent proximity sensors
US9184745B2 (en) 2012-04-11 2015-11-10 Ford Global Technologies, Llc Proximity switch assembly and method of sensing user input based on signal rate of change
US9944237B2 (en) 2012-04-11 2018-04-17 Ford Global Technologies, Llc Proximity switch assembly with signal drift rejection and method
US9219472B2 (en) 2012-04-11 2015-12-22 Ford Global Technologies, Llc Proximity switch assembly and activation method using rate monitoring
US9520875B2 (en) 2012-04-11 2016-12-13 Ford Global Technologies, Llc Pliable proximity switch assembly and activation method
US9287864B2 (en) 2012-04-11 2016-03-15 Ford Global Technologies, Llc Proximity switch assembly and calibration method therefor
US9136840B2 (en) * 2012-05-17 2015-09-15 Ford Global Technologies, Llc Proximity switch assembly having dynamic tuned threshold
US9337832B2 (en) * 2012-06-06 2016-05-10 Ford Global Technologies, Llc Proximity switch and method of adjusting sensitivity therefor
US9146304B2 (en) 2012-09-10 2015-09-29 Apple Inc. Optical proximity sensor with ambient light and temperature compensation
US8922340B2 (en) 2012-09-11 2014-12-30 Ford Global Technologies, Llc Proximity switch based door latch release
US9704387B1 (en) 2012-10-31 2017-07-11 Robert C. Goodman Self-illuminating remote controller
US9024530B2 (en) 2012-11-13 2015-05-05 Apple Inc. Synchronized ambient light sensor and display
US9129548B2 (en) 2012-11-15 2015-09-08 Apple Inc. Ambient light sensors with infrared compensation
US9070648B2 (en) 2012-11-27 2015-06-30 Apple Inc. Electronic devices with display-integrated light sensors
US8987652B2 (en) 2012-12-13 2015-03-24 Apple Inc. Electronic device with display and low-noise ambient light sensor with a control circuitry that periodically disables the display
US9310843B2 (en) 2013-01-02 2016-04-12 Apple Inc. Electronic devices with light sensors and displays
US9088282B2 (en) 2013-01-25 2015-07-21 Apple Inc. Proximity sensors with optical and electrical sensing capabilities
FR3002052B1 (en) 2013-02-14 2016-12-09 Fogale Nanotech METHOD AND DEVICE FOR NAVIGATING A DISPLAY SCREEN AND APPARATUS COMPRISING SUCH A NAVIGATION
US9265112B2 (en) 2013-03-13 2016-02-16 Federal Law Enforcement Development Services, Inc. LED light control and management system
US9311204B2 (en) 2013-03-13 2016-04-12 Ford Global Technologies, Llc Proximity interface development system having replicator and method
US9310064B2 (en) 2013-03-17 2016-04-12 Bao Tran Liquid cooled light bulb
US9264138B2 (en) * 2013-05-16 2016-02-16 Disney Enterprises, Inc. Reliable visibile light communication with dark light synchronization
US9155155B1 (en) 2013-08-20 2015-10-06 Ketra, Inc. Overlapping measurement sequences for interference-resistant compensation in light emitting diode devices
US9345097B1 (en) 2013-08-20 2016-05-17 Ketra, Inc. Interference-resistant compensation for illumination devices using multiple series of measurement intervals
USRE48956E1 (en) 2013-08-20 2022-03-01 Lutron Technology Company Llc Interference-resistant compensation for illumination devices using multiple series of measurement intervals
US9769899B2 (en) 2014-06-25 2017-09-19 Ketra, Inc. Illumination device and age compensation method
US9237620B1 (en) 2013-08-20 2016-01-12 Ketra, Inc. Illumination device and temperature compensation method
USRE48955E1 (en) 2013-08-20 2022-03-01 Lutron Technology Company Llc Interference-resistant compensation for illumination devices having multiple emitter modules
US9651632B1 (en) 2013-08-20 2017-05-16 Ketra, Inc. Illumination device and temperature calibration method
US9332598B1 (en) 2013-08-20 2016-05-03 Ketra, Inc. Interference-resistant compensation for illumination devices having multiple emitter modules
US9360174B2 (en) 2013-12-05 2016-06-07 Ketra, Inc. Linear LED illumination device with improved color mixing
US9247605B1 (en) 2013-08-20 2016-01-26 Ketra, Inc. Interference-resistant compensation for illumination devices
US9578724B1 (en) 2013-08-20 2017-02-21 Ketra, Inc. Illumination device and method for avoiding flicker
US9736895B1 (en) 2013-10-03 2017-08-15 Ketra, Inc. Color mixing optics for LED illumination device
US9146028B2 (en) 2013-12-05 2015-09-29 Ketra, Inc. Linear LED illumination device with improved rotational hinge
US20150198941A1 (en) 2014-01-15 2015-07-16 John C. Pederson Cyber Life Electronic Networking and Commerce Operating Exchange
US20150226788A1 (en) * 2014-02-07 2015-08-13 Fujitsu Limited Optical device failure detection
CN103984028A (en) * 2014-05-26 2014-08-13 中国联合网络通信集团有限公司 Detection device and mobile terminal
US9167666B1 (en) 2014-06-02 2015-10-20 Ketra, Inc. Light control unit with detachable electrically communicative faceplate
US9736903B2 (en) 2014-06-25 2017-08-15 Ketra, Inc. Illumination device and method for calibrating and controlling an illumination device comprising a phosphor converted LED
US10161786B2 (en) 2014-06-25 2018-12-25 Lutron Ketra, Llc Emitter module for an LED illumination device
US9392663B2 (en) 2014-06-25 2016-07-12 Ketra, Inc. Illumination device and method for controlling an illumination device over changes in drive current and temperature
US9557214B2 (en) 2014-06-25 2017-01-31 Ketra, Inc. Illumination device and method for calibrating an illumination device over changes in temperature, drive current, and time
US9510416B2 (en) 2014-08-28 2016-11-29 Ketra, Inc. LED illumination device and method for accurately controlling the intensity and color point of the illumination device over time
US9392660B2 (en) 2014-08-28 2016-07-12 Ketra, Inc. LED illumination device and calibration method for accurately characterizing the emission LEDs and photodetector(s) included within the LED illumination device
FR3025687B1 (en) * 2014-09-08 2019-05-24 Schneider Electric Industries Sas DEVICE FOR TRANSMITTING AN ELECTRICAL PARAMETER SIGNAL TO A CONTROLLING MEMBER OF A LIGHT EMITTING DIODE LIGHT MODULE, POWER SUPPLY SYSTEM, LIGHTING ASSEMBLY AND TRANSMISSION METHOD THEREOF
US10038443B2 (en) 2014-10-20 2018-07-31 Ford Global Technologies, Llc Directional proximity switch assembly
CN104506235B (en) * 2014-12-10 2018-11-30 北京智谷睿拓技术服务有限公司 Optical communication method and equipment
US9537979B2 (en) * 2014-12-12 2017-01-03 Intel Corporation Network adapter optical alert system
US10451376B2 (en) 2014-12-16 2019-10-22 Kurt S. SCHULZ Firearm simulators
US9237612B1 (en) 2015-01-26 2016-01-12 Ketra, Inc. Illumination device and method for determining a target lumens that can be safely produced by an illumination device at a present temperature
US9485813B1 (en) 2015-01-26 2016-11-01 Ketra, Inc. Illumination device and method for avoiding an over-power or over-current condition in a power converter
US9237623B1 (en) 2015-01-26 2016-01-12 Ketra, Inc. Illumination device and method for determining a maximum lumens that can be safely produced by the illumination device to achieve a target chromaticity
US11113941B2 (en) 2015-02-27 2021-09-07 Carrier Corporation Ambient light sensor in a hazard detector and a method of using the same
US9654103B2 (en) 2015-03-18 2017-05-16 Ford Global Technologies, Llc Proximity switch assembly having haptic feedback and method
US9548733B2 (en) 2015-05-20 2017-01-17 Ford Global Technologies, Llc Proximity sensor assembly having interleaved electrode configuration
FR3038450B1 (en) * 2015-07-01 2017-08-18 Sagemcom Broadband Sas METHOD FOR DETERMINING A LIGHT EMITTING CAPACITY OF A LIGHT EMITTING DIODE
US20170048953A1 (en) 2015-08-11 2017-02-16 Federal Law Enforcement Development Services, Inc. Programmable switch and system
US10644077B1 (en) 2015-10-28 2020-05-05 Apple Inc. Display with array of light-transmitting windows
US10157590B1 (en) 2015-12-15 2018-12-18 Apple Inc. Display with localized brightness adjustment capabilities
BR112018012812A2 (en) 2015-12-22 2018-12-04 3M Innovative Properties Co performance monitoring disinfectant system
CN108781337A (en) * 2016-03-08 2018-11-09 索诺瓦公司 Hearing devices, hearing devices system and the method executed in hearing devices
CN105702230B (en) * 2016-04-14 2018-06-05 广东欧珀移动通信有限公司 Display backlight luminance regulating method, device and the terminal of a kind of terminal
DE102016207355A1 (en) 2016-04-29 2017-11-02 Ford Global Technologies, Llc LED arrangement and method for ambient light-dependent brightness control of LEDs
US20170346557A1 (en) * 2016-05-25 2017-11-30 Korea Maritime and Ocean University Research and Development Business Foundation Underwater visible light transceiving terminal
US10163984B1 (en) 2016-09-12 2018-12-25 Apple Inc. Display with embedded components and subpixel windows
US10310326B2 (en) 2016-10-10 2019-06-04 Hyperion Technology, LLC Liquid crystal display using the photovoltaic behavior of LED backlights as a source of electrical energy
KR102653578B1 (en) * 2016-11-25 2024-04-04 엘지디스플레이 주식회사 Electroluminescent display device integrated with image sensor
US10895435B2 (en) * 2017-02-27 2021-01-19 Kurt S. SCHULZ Firearm simulator targets and firearm simulation systems
US11257463B2 (en) * 2017-03-31 2022-02-22 Cae Inc. Artificial eye system
CN106961309B (en) * 2017-05-31 2019-06-21 中国科学技术大学 A kind of VLC transceiver and visible light communication system
US11245469B2 (en) * 2017-07-27 2022-02-08 The Regents Of The University Of Michigan Line-of-sight optical communication for vehicle-to-vehicle (v2v) and vehicle-to-infrastructure (v2i) mobile communication networks
US11079077B2 (en) 2017-08-31 2021-08-03 Lynk Labs, Inc. LED lighting system and installation methods
US11272599B1 (en) 2018-06-22 2022-03-08 Lutron Technology Company Llc Calibration procedure for a light-emitting diode light source
CN108709638B (en) * 2018-07-27 2021-01-08 维沃移动通信有限公司 LED circuit, electronic equipment and detection method
CN111899694B (en) * 2019-05-06 2022-06-07 京东方科技集团股份有限公司 Backlight control method and device of backlight module and display device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999040559A2 (en) * 1998-02-06 1999-08-12 Koninklijke Philips Electronics N.V. Organic electroluminescent device
WO2000041378A1 (en) * 1998-12-31 2000-07-13 Nokia Mobile Phones Limited Backlight for a portable device
GB2347592A (en) * 1998-12-28 2000-09-06 Nec Corp Portable telephone with backlit display
WO2001013209A1 (en) * 1999-08-18 2001-02-22 Ericsson, Inc. Electronic devices including keypads that illuminate in response to proximity of a user and methods of operating such electronic devices

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4168427A (en) 1978-06-14 1979-09-18 Bell Telephone Laboratories, Incorporated Duplex optical communication system with reverse Rayleigh scattered power equalizer
US4567480A (en) * 1982-12-13 1986-01-28 John Fluke Mfg. Co., Inc. Touch-sensitive overlay
US5268635A (en) * 1992-07-31 1993-12-07 At&T Bell Laboratories Intelligent self-diagnosing and sparing light emitting diodes
US5903624A (en) * 1993-03-08 1999-05-11 Communications Manufacturing Company Data terminal for telephone circuits
US5537211A (en) * 1995-01-13 1996-07-16 Triliance Corporation Method and apparatus for selecting a wearable to match an object
US5795327A (en) * 1995-03-06 1998-08-18 Sabratek Corporation Infusion pump with historical data recording
US5631757A (en) * 1995-06-07 1997-05-20 Lucent Technologies Inc. Full-duplex data communication system using different transmit and receive data symbol lengths
US5736973A (en) * 1995-11-01 1998-04-07 Digital Ocean, Inc. Integrated backlight display system for a personal digital assistant
US5829878A (en) * 1996-10-15 1998-11-03 Micro Idea Instruments, Ltd. Digital fever thermometer having an illuminated display
US6219021B1 (en) * 1997-09-29 2001-04-17 Sharp Kabushiki Kaisha Display control device and storage medium therefor
US6330091B1 (en) * 1998-05-15 2001-12-11 Universal Electronics Inc. IR receiver using IR transmitting diode
JP2002539590A (en) * 1999-03-11 2002-11-19 パワー・サーキット・イノベーションズ・インコーポレーテッド Networkable power controller
US6204752B1 (en) * 1999-11-24 2001-03-20 Shimano Inc. Bicycle display unit with backlight
JP3438693B2 (en) * 2000-02-03 2003-08-18 日本電気株式会社 Electronic device with display
US6559788B1 (en) * 2002-02-12 2003-05-06 Charles Douglas Murphy Parallel and shared parallel analog-to-digital conversion for digital imaging

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999040559A2 (en) * 1998-02-06 1999-08-12 Koninklijke Philips Electronics N.V. Organic electroluminescent device
GB2347592A (en) * 1998-12-28 2000-09-06 Nec Corp Portable telephone with backlit display
WO2000041378A1 (en) * 1998-12-31 2000-07-13 Nokia Mobile Phones Limited Backlight for a portable device
WO2001013209A1 (en) * 1999-08-18 2001-02-22 Ericsson, Inc. Electronic devices including keypads that illuminate in response to proximity of a user and methods of operating such electronic devices

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1701331A1 (en) * 2005-03-07 2006-09-13 Research In Motion Limited System and method for adjusting a backlight for a display for an electronic device
US9854975B2 (en) 2006-06-12 2018-01-02 Koninklijke Philips N.V. Skin monitoring device, method of monitoring the skin, monitoring device, method of irradiating the skin, and use of an OLED
EP2482273A1 (en) * 2011-01-28 2012-08-01 Broadcom Corporation Apparatus and method for using an LED for backlighting and ambient light sensing
US9041697B2 (en) 2011-01-28 2015-05-26 Broadcom Corporation Apparatus and method for using an LED for backlighting and ambient light sensing
US9646544B2 (en) 2011-01-28 2017-05-09 Avago Technologies General Ip (Singapore) Pte. Ltd. Apparatus and method for using an LED for backlighting and ambient light sensing
US8575845B2 (en) 2011-12-14 2013-11-05 Texas Instruments Incorporated Method and apparatus to measure light intensity
DE102014005927A1 (en) 2014-04-24 2015-04-09 Diehl Aerospace Gmbh Illuminating device and method with the illuminating device
WO2019184989A1 (en) * 2018-03-29 2019-10-03 京东方科技集团股份有限公司 Charge release circuit and driving method therefor, and display device
US11156868B2 (en) 2018-03-29 2021-10-26 Beijing Boe Optoelectronics Technology Co., Ltd. Charge release circuit and driving method therefor, and display device
CN110278642A (en) * 2019-06-25 2019-09-24 珠海格力电器股份有限公司 A kind of controller backlight control system and method

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US20030189211A1 (en) 2003-10-09
US7072587B2 (en) 2006-07-04
US20040208632A1 (en) 2004-10-21
US6664744B2 (en) 2003-12-16
CN1514992A (en) 2004-07-21

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