WO2006109010A1 - Display assembly with photosensitive elements - Google Patents

Display assembly with photosensitive elements Download PDF

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Publication number
WO2006109010A1
WO2006109010A1 PCT/GB2006/000728 GB2006000728W WO2006109010A1 WO 2006109010 A1 WO2006109010 A1 WO 2006109010A1 GB 2006000728 W GB2006000728 W GB 2006000728W WO 2006109010 A1 WO2006109010 A1 WO 2006109010A1
Authority
WO
WIPO (PCT)
Prior art keywords
display
photosites
assembly
cell
photosite
Prior art date
Application number
PCT/GB2006/000728
Other languages
French (fr)
Inventor
John Michael Green
Original Assignee
John Michael Green
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 John Michael Green filed Critical John Michael Green
Publication of WO2006109010A1 publication Critical patent/WO2006109010A1/en

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/14—Systems for two-way working
    • H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
    • H04N7/142—Constructional details of the terminal equipment, e.g. arrangements of the camera and the display
    • H04N7/144—Constructional details of the terminal equipment, e.g. arrangements of the camera and the display camera and display on the same optical axis, e.g. optically multiplexing the camera and display for eye to eye contact
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • G02F1/13312—Circuits comprising photodetectors for purposes other than feedback

Definitions

  • This invention relates to displays, in particular displays including an array of display elements which can be collectively driven to provide a display output, for example an image of a scene.
  • the display could display what is directly in front of the display, ie mirror what is in front of the display.
  • One known way of achieving this result, to an approximation, is to place a camera close to the periphery of the display and to display a reversed image of the view seen by the camera on the display but this is not effective at mirroring close images due to the lateral displacement of the camera from the centre of the display area.
  • a more accurate effect is obtainable if the camera is situated centrally on the display but this has the disadvantage of blocking out a portion of the display, if the camera is positioned in front of the display, or requiring an arrangement to allow the camera to view through the centre of the display.
  • the present invention provides a display assembly including a display assembly including a two-dimensional array of display cells, each display cell including one or more display elements and one or more photosites, each of the photosites having a predetermined field of view.
  • the photosites can collectively form a view of what is in front of the display without noticeably obscuring the displayed image because the photosites are distributed over the display area.
  • the processed information from the photosite(s) associated with a given cell of display elements is displayed on each of the display elements of the display cell by means of suitable processing means.
  • Each cell of the display assembly can have the same or similar arrangement of photosite(s) and display element(s) or they may vary in constitution. There may be one or more photosites and, independently, one or more display elements in a given display cell.
  • the cells of the arrays may be rectangular or any other grouping.
  • a given photosite may be positioned in front of, or adjacent to, a display element or between two or more display elements of a given cell.
  • the photosites are configured such that their field of view, at the distance from the display that the object to be mirrored is positioned, will approximately equal the field of view represented by the display cell associated with the photosite.
  • the photosites and display elements may be charge coupled devices and liquid crystal display elements, for example.
  • Figure 1 is a schematic diagram of a first embodiment of the present invention
  • Figure 2 is a schematic diagram of a second embodiment of the present invention.
  • Figure 3 is a schematic diagram of a third embodiment of the present invention.
  • Figure 4 is a schematic diagram of a photosite useful with the present invention.
  • Figure 5 is a schematic diagram of a further photosite useful with the present invention.
  • Figure 6 is a schematic diagram an embodiment of the present invention coupled to a control processor
  • Figure 7 is a schematic diagram of the first embodiment of the present invention illustrating changing of the cell sizes
  • FIG 8 is a schematic diagram of a further embodiment of the present invention in which the capture device is clipped to a display screen.
  • Figure 1 shows a display assembly in which each display cell C includes a single display element 4 and single photosite 6 positioned in front of the display element 4, the display elements being illustrated, figuratively, as square elements for convenience.
  • the photosite 6 could, alternatively, be positioned adjacent the respective display cell 4, eg as illustrated by photosites 6a.
  • FIG. 2 shows a display assembly 10 in which each display cell C includes a square array of four display elements 1 2a, 1 2b, 1 2c and 1 2d, each display cell being associated with a single photosite 14. Again the photosite of a display cell could be positioned differently relative to the display elements 12, 1 2b, 12c and 1 2d, for example as shown by photosites 14a and 14b.
  • FIG. 3 shows a display assembly 20 according to the present invention in which there are three photosites 22a,22b and 22c associates with each single display element 24 of each display cell each photosite sensitive to a different frequency of visible light in order to provide colour information for display by the display element 24.
  • the present invention is not restricted to photosites which detect radiation in the visible part of the electromagnetic spectrum. They could, for example, be sensitive to infrared radiation. Similarly, the display need not reproduce the frequency detected but could be controlled to display a different frequency, for example to display a visible image derived from an infrared image detected by the photosites.
  • any suitable processing and control means may be used to process the signals generated by the photosites and to generate display signals so the display elements of the appropriate display cells of the display assembly are activated.
  • the display assembly of the present invention is not restricted in size and can be used with an array of displays cells of any useful dimensions.
  • the photosites may have a fixed field of view selected to match the normal, expected, viewing distance of the display or be adjustable to accommodate a variable viewing distance.
  • Figure 4 shows a side sectional view of a photosite 30 on a display panel 32 positioned at the bottom of a tubular light shield 34 which acts to restrict the angle of view of the photosite 30 to a desired angle.
  • This tubular light shield 34 may also be used to shield the photosite 30 from electromagnetic radiation emitted by backlighting of the display or the display elements of the display.
  • Figure 5 shows a variation of the shielded photosite of Figure 4 in which the tubular shield 34 is provided with an entrance pupil 36 to further restrict the electromagnetic radiation striking the photosite 30,
  • optical properties of the photosites may be modified, as desired, by the use of lenses.
  • FIG. 6 shows a display assembly 40 with each display cell having a single photosite, and a single display element coupled, respectively, to a photosite signal bus 42 and a display element bus 44 (shown schematically) connected via respective interfaces 46 and 48 to a processing means 50, for example a personal computer.
  • the display assembly of the present invention is operated as follows.
  • the signals from the photosites are passed to a processing means which is arranged to drive the display elements of a given display cell of the display assembly in some function of the signals from the photosites of that display cell.
  • What are considered to be display cells can be dynamically adjusted by suitable processing of the photosite signals.
  • a cell 60 could be considered to be made up of one display element 62 and one photosite 64 and the display element 62 controlled in response to the signal from the photosite 64.
  • the display elements could also be treated as being in cells 66 having an array of four display elements and four photosites, the display elements being driven to output the same display output dependent on the signals from one or more photosites 64.
  • This light can be natural daylight or may need to be from an artificial source. If artificial light is required then back lighting the screen will help accomplish this, as would outside lights directed towards the image the camera screen is to capture. In the event of backlighting, this light would normally be turned dim or black by the pixels cells or crystals being turned off. This is called the refresh time which all display screens use. It is during this refresh time when the light would normally be dimmed that the camera screen would capture the image. For the mirror it is proposed that the pixels, cells or crystals are increased to full bright white at the time of refresh. The amount of light emitted can then be controlled by the microprocessor so maximum lighting of the image can be achieved.
  • the photosites may be fabricated as part of the array of display cells or may be formed on a largely transparent substrate as distinct detector array assembly which can then be mounted on a separately manufactured display to form a display assembly according to the present invention, as in the embodiment of Figure 8.
  • an LED display screen 80 is supported by a stand 82.
  • a detector array assembly 84 is clipped over the display area 86 of the screen 80 by clips 88.
  • a display assembly according to the present invention could be formed from grouping one or more display assemblies, each according to the present invention.

Abstract

A display assembly (2) including a two-dimensional array of display cells (C), each display cell (C) including one or more display elements (4) and one or more photosites (6), each of the photosites (6) having a predetermined field of view.

Description

DISPLAY ASSEMBLY WITH PHOTOSENSITIVE ELEMENTS
This invention relates to displays, in particular displays including an array of display elements which can be collectively driven to provide a display output, for example an image of a scene.
In some circumstances it would be useful if the display could display what is directly in front of the display, ie mirror what is in front of the display. One known way of achieving this result, to an approximation, is to place a camera close to the periphery of the display and to display a reversed image of the view seen by the camera on the display but this is not effective at mirroring close images due to the lateral displacement of the camera from the centre of the display area. A more accurate effect is obtainable if the camera is situated centrally on the display but this has the disadvantage of blocking out a portion of the display, if the camera is positioned in front of the display, or requiring an arrangement to allow the camera to view through the centre of the display.
The present invention provides a display assembly including a display assembly including a two-dimensional array of display cells, each display cell including one or more display elements and one or more photosites, each of the photosites having a predetermined field of view.
The photosites can collectively form a view of what is in front of the display without noticeably obscuring the displayed image because the photosites are distributed over the display area. The processed information from the photosite(s) associated with a given cell of display elements is displayed on each of the display elements of the display cell by means of suitable processing means.
Each cell of the display assembly can have the same or similar arrangement of photosite(s) and display element(s) or they may vary in constitution. There may be one or more photosites and, independently, one or more display elements in a given display cell. The cells of the arrays may be rectangular or any other grouping. A given photosite may be positioned in front of, or adjacent to, a display element or between two or more display elements of a given cell.
The photosites are configured such that their field of view, at the distance from the display that the object to be mirrored is positioned, will approximately equal the field of view represented by the display cell associated with the photosite.
The photosites and display elements may be charge coupled devices and liquid crystal display elements, for example.
Embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings of which:
Figure 1 is a schematic diagram of a first embodiment of the present invention;
Figure 2 is a schematic diagram of a second embodiment of the present invention;
Figure 3 is a schematic diagram of a third embodiment of the present invention;
Figure 4 is a schematic diagram of a photosite useful with the present invention.
Figure 5 is a schematic diagram of a further photosite useful with the present invention;
Figure 6 is a schematic diagram an embodiment of the present invention coupled to a control processor;
Figure 7 is a schematic diagram of the first embodiment of the present invention illustrating changing of the cell sizes; and
Figure 8 is a schematic diagram of a further embodiment of the present invention in which the capture device is clipped to a display screen. Figure 1 shows a display assembly in which each display cell C includes a single display element 4 and single photosite 6 positioned in front of the display element 4, the display elements being illustrated, figuratively, as square elements for convenience.
The photosite 6 could, alternatively, be positioned adjacent the respective display cell 4, eg as illustrated by photosites 6a.
Figure 2 shows a display assembly 10 in which each display cell C includes a square array of four display elements 1 2a, 1 2b, 1 2c and 1 2d, each display cell being associated with a single photosite 14. Again the photosite of a display cell could be positioned differently relative to the display elements 12, 1 2b, 12c and 1 2d, for example as shown by photosites 14a and 14b.
There may be more than one photosite associated with a given display cell of a display assembly either to increase the amount of radiation received in respect of the display cell or to provide sensitivity over a range of wavelengths, eg so a colour may be detected and subsequently displayed. Figure 3 shows a display assembly 20 according to the present invention in which there are three photosites 22a,22b and 22c associates with each single display element 24 of each display cell each photosite sensitive to a different frequency of visible light in order to provide colour information for display by the display element 24.
The present invention is not restricted to photosites which detect radiation in the visible part of the electromagnetic spectrum. They could, for example, be sensitive to infrared radiation. Similarly, the display need not reproduce the frequency detected but could be controlled to display a different frequency, for example to display a visible image derived from an infrared image detected by the photosites.
It will be appreciated the present invention is not restricted in any way to particular forms of photosite or display elements nor any particular method of manufacturing them. Similarly, any suitable processing and control means may be used to process the signals generated by the photosites and to generate display signals so the display elements of the appropriate display cells of the display assembly are activated.
The display assembly of the present invention is not restricted in size and can be used with an array of displays cells of any useful dimensions.
The photosites may have a fixed field of view selected to match the normal, expected, viewing distance of the display or be adjustable to accommodate a variable viewing distance.
Figure 4 shows a side sectional view of a photosite 30 on a display panel 32 positioned at the bottom of a tubular light shield 34 which acts to restrict the angle of view of the photosite 30 to a desired angle. This tubular light shield 34 may also be used to shield the photosite 30 from electromagnetic radiation emitted by backlighting of the display or the display elements of the display.
Figure 5 shows a variation of the shielded photosite of Figure 4 in which the tubular shield 34 is provided with an entrance pupil 36 to further restrict the electromagnetic radiation striking the photosite 30,
The optical properties of the photosites may be modified, as desired, by the use of lenses.
Figure 6 shows a display assembly 40 with each display cell having a single photosite, and a single display element coupled, respectively, to a photosite signal bus 42 and a display element bus 44 (shown schematically) connected via respective interfaces 46 and 48 to a processing means 50, for example a personal computer.
The display assembly of the present invention is operated as follows. The signals from the photosites are passed to a processing means which is arranged to drive the display elements of a given display cell of the display assembly in some function of the signals from the photosites of that display cell. What are considered to be display cells can be dynamically adjusted by suitable processing of the photosite signals. Referring to Figure 7 a cell 60 could be considered to be made up of one display element 62 and one photosite 64 and the display element 62 controlled in response to the signal from the photosite 64. The display elements could also be treated as being in cells 66 having an array of four display elements and four photosites, the display elements being driven to output the same display output dependent on the signals from one or more photosites 64.
In the case of most video images capture light is required. This light can be natural daylight or may need to be from an artificial source. If artificial light is required then back lighting the screen will help accomplish this, as would outside lights directed towards the image the camera screen is to capture. In the event of backlighting, this light would normally be turned dim or black by the pixels cells or crystals being turned off. This is called the refresh time which all display screens use. It is during this refresh time when the light would normally be dimmed that the camera screen would capture the image. For the mirror it is proposed that the pixels, cells or crystals are increased to full bright white at the time of refresh. The amount of light emitted can then be controlled by the microprocessor so maximum lighting of the image can be achieved.
The photosites may be fabricated as part of the array of display cells or may be formed on a largely transparent substrate as distinct detector array assembly which can then be mounted on a separately manufactured display to form a display assembly according to the present invention, as in the embodiment of Figure 8. In this embodiment an LED display screen 80 is supported by a stand 82. A detector array assembly 84 is clipped over the display area 86 of the screen 80 by clips 88.
A display assembly according to the present invention could be formed from grouping one or more display assemblies, each according to the present invention.

Claims

1 . A display assembly including a two-dimensional array of display cells, each display cell including one or more display elements and one or more photosites, each of the photosites having a predetermined field of view.
2. A display assembly as claimed in claim 1 , in which each display cell has one display element.
3. A display assembly as claimed in claim 1 , in which each display cell has two or more display elements.
4. A display assembly as claimed in any one of claims 1 to 3, in which each display cell has one photosite.
5. A display assembly as claimed in any one of claims 1 to 3, in which each display cell has two or more photosites.
6. A display assembly as claimed in any preceding claim, in which each of the one or more photosites is adjacent a display element of the associated display cell.
7. A display assembly as claimed in any one of claims 1 to 5 in which at least one photosite of each display cell is positioned in front of a display element of that display ceil.
8. A display assembly in any preceding claim in which the photosites are charge coupled devices.
9. A display assembly as claimed in any preceding claim in which the display elements are liquid crystal display elements. 10, A display assembly as claimed in any preceding claim in which includes a detector array assembly including said photosites and which is detachably mounted on a display including said display elements.
1 1 . A display assembly substantially as hereinbefore described with reference to and/or as shown in, the accompanying drawings.
PCT/GB2006/000728 2005-04-12 2006-03-01 Display assembly with photosensitive elements WO2006109010A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0507384.6 2005-04-12
GBGB0507384.6A GB0507384D0 (en) 2005-04-12 2005-04-12 Display assembly

Publications (1)

Publication Number Publication Date
WO2006109010A1 true WO2006109010A1 (en) 2006-10-19

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WO (1) WO2006109010A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012131307A1 (en) 2011-03-29 2012-10-04 Kromek Limited Crystal growth apparatus
WO2017080057A1 (en) * 2015-11-13 2017-05-18 小米科技有限责任公司 Oled panel, terminal, and photosensitive control method
WO2018161563A1 (en) * 2017-03-10 2018-09-13 京东方科技集团股份有限公司 Display panel, and display device and image acquisition method thereof
WO2018171174A1 (en) * 2017-03-22 2018-09-27 京东方科技集团股份有限公司 Display panel and display apparatus

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US6040810A (en) * 1996-01-08 2000-03-21 Sharp Kabushiki Kaisha Display device having display and imaging pixels sandwiched between same substrates
US20020030775A1 (en) * 2000-07-31 2002-03-14 Koninklijke Philips Electronics N.V. Image-sensing display device
US20030179324A1 (en) * 2002-03-19 2003-09-25 Seiko Epson Corporation Liquid crystal display device, electro-optical device and method of producing the same, and electronic apparatus
US20040207718A1 (en) * 2001-11-14 2004-10-21 Boyden James H. Camera positioning system and method for eye -to-eye communication

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6040810A (en) * 1996-01-08 2000-03-21 Sharp Kabushiki Kaisha Display device having display and imaging pixels sandwiched between same substrates
US20020030775A1 (en) * 2000-07-31 2002-03-14 Koninklijke Philips Electronics N.V. Image-sensing display device
US20040207718A1 (en) * 2001-11-14 2004-10-21 Boyden James H. Camera positioning system and method for eye -to-eye communication
US20030179324A1 (en) * 2002-03-19 2003-09-25 Seiko Epson Corporation Liquid crystal display device, electro-optical device and method of producing the same, and electronic apparatus

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012131307A1 (en) 2011-03-29 2012-10-04 Kromek Limited Crystal growth apparatus
WO2017080057A1 (en) * 2015-11-13 2017-05-18 小米科技有限责任公司 Oled panel, terminal, and photosensitive control method
JP2018506730A (en) * 2015-11-13 2018-03-08 シャオミ・インコーポレイテッド OLED panel, terminal and photosensitive control method
RU2661034C2 (en) * 2015-11-13 2018-07-11 Сяоми Инк. Oled panel, terminal and method of controlling light sensitivity
WO2018161563A1 (en) * 2017-03-10 2018-09-13 京东方科技集团股份有限公司 Display panel, and display device and image acquisition method thereof
US10623697B2 (en) 2017-03-10 2020-04-14 Boe Technology Group Co., Ltd. Display panel, display device and image pickup method therefor
WO2018171174A1 (en) * 2017-03-22 2018-09-27 京东方科技集团股份有限公司 Display panel and display apparatus
US11121189B2 (en) 2017-03-22 2021-09-14 Boe Technology Group Co., Ltd. Display panel and display device

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