US5847690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrated liquid crystal display and digitizer having a black matrix layer adapted for sensing screen touch location
Assignee: Nokia of America Corp
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Filing: 1995-10-24
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Granted: 1998-12-08
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Expires: 2015-10-24
Abstract
Abstract A unitary display and sensing device integrates liquid crystal display module elements of a liquid crystal display module for detecting input on a flat panel display screen with the capability for digitizing the detected inputs. In accordance with an illustrative embodiment of the present invention, display elements of a liquid crystal display module are modified to sense input on the display screen. An electrical signal is applied to modified display elements of the liquid crystal display module so that contact with a surface portion of the display screen produces an output signal indicative of its location. The integrated display and sensing device is active matrix addressed for finger input, but may also incorporate display systems for active pen input.
Inventors
- 👤 Robert Albert Boie
- 👤 Richard Alan Gottscho
- 👤 Allan Robert Kmetz
- 👤 Richard H. Krukar
- 👤 Po-Yen Lu
- 👤 John Robert Morris, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:43
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/03; G06F3/041; G06F3/0412; G06F3/044; G06F3/0443
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
133 words
A liquid crystal display comprising: a display screen; an active matrix plate spaced apart from the display screen wherein the active matrix plate has a plurality of switching elements connected to an array of thin film transistors formed thereon; a color filter plate positioned between the display screen and the active matrix plate wherein the color filter plate has a layer of black matrix material formed on a surface thereof; and a transparent conductive layer positioned between the active matrix plate and the color filter plate wherein the layer of black matrix material and the transparent conductive layer are adapted to sense the location of an object touching the display screen based upon the relative size of the displacement current generated at the point of contact between the object and the display screen.
Claim 2
Dependent Claim
133 words
A liquid crystal display comprising: a display screen; an active matrix plate spaced apart from the display screen wherein the active matrix plate has a plurality of switching elements connected to an array of thin film transistors formed thereon; a color filter plate positioned between the display screen and the active matrix plate wherein the color filter plate has a layer of black matrix material formed on a surface thereof; and a transparent conductive layer positioned between the active matrix plate and the color filter plate wherein the layer of black matrix material and the transparent conductive layer are adapted to sense the location of an object touching the display screen based upon the relative size of the displacement current generated at the point of contact between the object and the display screen.
Claim 3
Dependent Claim
13 words
The liquid crystal display of claim 1 wherein the object is a finger.
Claim 4
Dependent Claim
13 words
The liquid crystal display of claim 1 wherein the object is a stylus.
Claim 5
Dependent Claim
36 words
The liquid crystal display of claim 1 wherein the layer of black matrix material is patterned into a plurality of strips of conducting material which are separated from each other by a plurality of isolation areas.
Claim 6
Dependent Claim
66 words
The liquid crystal display of claim 1 wherein the plurality of switching elements are adapted to have a plurality of gate lines and a plurality of row lines and wherein at least one of the plurality of isolation areas are aligned to one of the plurality of gate lines and the plurality of row lines of the plurality of switching elements on the active matrix plate.
Claim 7
Dependent Claim
30 words
The liquid crystal display of claim 4 wherein the layer of black matrix material is further patterned to have a plurality of resistive strings and a plurality of contact pads.
Claim 8
Dependent Claim
17 words
The liquid crystal display of claim 4 wherein at least one of the isolation areas is non-continuous.
Claim 9
Dependent Claim
45 words
The liquid crystal display of claim 7 further comprising a color filter array having a red filter, a blue filter and a green filter, wherein the at least one isolation area that is non-continuous is aligned to the blue filter of the color filter array.
Claim 10
Independent Claim
147 words
A method of sensing the location of an object touching a surface portion of a display screen of a liquid crystal display comprising the steps of: applying a signal to a black matrix layer of a liquid crystal display wherein the black matrix layer is patterned into a plurality of stripes of conducting material which are separated from each other by a plurality of isolation areas, and wherein the signal generates a current in the black matrix layer; and generating a displacement current in response to an object touching a portion of a display screen of the liquid crystal display wherein the black matrix layer and a transparent conductive layer of the liquid crystal display sense the location of the object touching the display screen based upon the relative size of the displacement current generated at the point of contact between the object and the display screen.
Claim 11
Independent Claim
147 words
A method of sensing the location of an object touching a surface portion of a display screen of a liquid crystal display comprising the steps of: applying a signal to a black matrix layer of a liquid crystal display wherein the black matrix layer is patterned into a plurality of stripes of conducting material which are separated from each other by a plurality of isolation areas, and wherein the signal generates a current in the black matrix layer; and generating a displacement current in response to an object touching a portion of a display screen of the liquid crystal display wherein the black matrix layer and a transparent conductive layer of the liquid crystal display sense the location of the object touching the display screen based upon the relative size of the displacement current generated at the point of contact between the object and the display screen.
Claim 12
Dependent Claim
11 words
The method of claim 9 wherein the object is a stylus.
Claim 13
Dependent Claim
11 words
The method of claim 9 wherein the object is a finger.
Claim 14
Dependent Claim
19 words
The method of claim 9 further comprising applying the signal to a transparent conductor of the liquid crystal display.
Claim 15
Independent Claim
151 words
A method of sensing the location of an object touching a surface portion of a display screen of a liquid crystal display comprising the steps of: applying a signal to a black matrix layer and a transparent conductor of a liquid crystal display wherein the black matrix layer is patterned into a plurality of strips of conducting material which are separated from each other by a plurality of isolation areas, and wherein the signal generates a current in the black matrix layer; and generating a displacement current in response to an object touching a portion of a display screen of the liquid crystal display wherein the black matrix layer and the transparent conductive layer of the liquid crystal display sense the location of the object touching the display screen based upon the relative size of the displacement current generated at the point of contact between the object and the display screen.
Claim 16
Independent Claim
151 words
A method of sensing the location of an object touching a surface portion of a display screen of a liquid crystal display comprising the steps of: applying a signal to a black matrix layer and a transparent conductor of a liquid crystal display wherein the black matrix layer is patterned into a plurality of strips of conducting material which are separated from each other by a plurality of isolation areas, and wherein the signal generates a current in the black matrix layer; and generating a displacement current in response to an object touching a portion of a display screen of the liquid crystal display wherein the black matrix layer and the transparent conductive layer of the liquid crystal display sense the location of the object touching the display screen based upon the relative size of the displacement current generated at the point of contact between the object and the display screen.
References Cited (Backward Citations)
US4224615A
Cited
US4290061A
Cited
US4363029A
Cited
US4529968A
Cited
GB2134760A
Cited
US4893115A
Cited
US5159323A
Cited
US4893071A
Cited
US5083118A
Cited
US5300927A
Cited
US5592197A
Cited
US5337353A
Cited
US5534892A
Cited
US5353135A
Cited
US5606194A
Cited
US5568292A
Cited
EP0622754A1
Cited
US5677744A
Cited
US5550659A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-12-07 | 2002-06-08 | 2002-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-12-07 | 2006-06-08 | 2006-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-12-07 | 2010-06-08 | 2010-12-08 | $7700.00 | Window Closed / Lapsed |