CA2038598A1 - Lcd touch screen - Google Patents

Lcd touch screen

Info

Publication number
CA2038598A1
CA2038598A1 CA002038598A CA2038598A CA2038598A1 CA 2038598 A1 CA2038598 A1 CA 2038598A1 CA 002038598 A CA002038598 A CA 002038598A CA 2038598 A CA2038598 A CA 2038598A CA 2038598 A1 CA2038598 A1 CA 2038598A1
Authority
CA
Canada
Prior art keywords
light
viewing surface
transflector
array
touch screen
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA002038598A
Other languages
French (fr)
Other versions
CA2038598C (en
Inventor
Gregory J. May
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HP Inc
Original Assignee
Hewlett Packard Co
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 Hewlett Packard Co filed Critical Hewlett Packard Co
Publication of CA2038598A1 publication Critical patent/CA2038598A1/en
Application granted granted Critical
Publication of CA2038598C publication Critical patent/CA2038598C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
    • 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
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/13338—Input devices, e.g. touch panels

Abstract

A touch screen includes a liquid crystal display (LCD) having a viewing surface through which light passes into and out of the display and a back surface comprising a transflector such as transflective film. The transflector reflects some of the light beak through the display and viewing surface and transmits some of the light. An array of light dependent resistors (LDRs) or equivalent light detecting devices underlie the transflector and detect a change in the transmitted light caused by a touching of the viewing surface. The light detecting array may be integrated into a keyboard interface. Keys are then displayed on the viewing surface opposite LDRs in the array to indicate where the viewing surface must be touched to actuate a key.
CA002038598A 1990-05-25 1991-03-19 Lcd touch screen Expired - Fee Related CA2038598C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/529,099 US5105186A (en) 1990-05-25 1990-05-25 Lcd touch screen
US529,099 1990-05-25

Publications (2)

Publication Number Publication Date
CA2038598A1 true CA2038598A1 (en) 1991-11-26
CA2038598C CA2038598C (en) 2002-01-08

Family

ID=24108519

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002038598A Expired - Fee Related CA2038598C (en) 1990-05-25 1991-03-19 Lcd touch screen

Country Status (6)

Country Link
US (1) US5105186A (en)
EP (1) EP0458513B1 (en)
JP (1) JP3385038B2 (en)
CA (1) CA2038598C (en)
DE (1) DE69128106T2 (en)
SG (1) SG47749A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7345680B2 (en) 2002-06-25 2008-03-18 David Albert M Laminated touch screen

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CA2038598C (en) 2002-01-08
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EP0458513A1 (en) 1991-11-27
JPH04232524A (en) 1992-08-20
DE69128106T2 (en) 1998-02-26
US5105186A (en) 1992-04-14
EP0458513B1 (en) 1997-11-05
JP3385038B2 (en) 2003-03-10

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