LIQUID CRYSTAL DISPLAY

• US 20110096035A1
• Filed: 01/04/2011
• Published: 04/28/2011
• Est. Priority Date: 09/09/2010
• Status: Abandoned Application

• Current Assignee: VastView Technology Inc.
• Original Assignee: VastView Technology Inc.
• Inventors: SHEN, Yuhren
• Application Number:
  US12/984,423
• Publication Number:
  US 20110096035A1
• Time in Patent Office: Days
• US Class Current: 345/175
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/042 by opto-electronic means

Abstract

A liquid crystal display comprises a liquid crystal module, a backlight module, a driving and detecting module, and plural photo-sensors; the said liquid crystal module contains polarizers, glass plates, liquid crystal, color filters, thin film transistors (TFTs), black matrixes, and various lines; the said backlight module contains light source, light guide, and diffuser; the said driving and detecting module contains date driver, gate driver, photo-sensor driver, and photo-sensing detector; the said plural photo-sensors contains P-N diodes or thin film transistors; each of the said plural photo-sensors is respectively installed at each pixel unit; the plural photo-sensors are used to sense the red and infrared rays which are first emitted from the light source, then pass through the liquid crystal module, and are finally reflected from the touch finger of the user using the optical touch-sensitive liquid crystal display, and are used to provide the sensed signals for the determination of the touch location of the user finger.

Claims

1. A liquid crystal display, comprising:

a liquid crystal module which contains an upper glass plate, a lower glass plate, plural pixel units, and plural thin film transistors;

a backlight module which contains a visible light source and an infrared source;

a driving and detecting module; and

plural photo-sensors, each of which is installed on the glass plate in every pixel cell, which are used for sensing the infrared rays which are first emitted from the light source, then pass through the liquid crystal module, and are finally reflected from the touch finger of the user using the optical touch-sensitive liquid crystal display, and are used to provide the sensed signals for the determination of the touch location of the user finger.

2. A liquid crystal display according to claim 1, wherein the plural photo-sensors are installed on the inner surface of the lower glass plate in the liquid crystal module.

3. A liquid crystal display according to claim 2, wherein each of the thin film transistors is installed at one corner of every pixel unit, and each of the photo-sensors is in stalled at any other corner of the pixel unit.

4. A liquid crystal display according to claim 1, wherein the plural photo-sensors are installed on the upper surface of the lower glass plate in the liquid crystal module.

5. A liquid crystal display according to claim 4, wherein each of the thin film transistors is installed at one corner of every pixel unit, and each of the photo-sensors is in stalled at any other corner of the pixel unit.

6. A liquid crystal display according to claim 1, where in both the visible light source and the infrared source in the backlight module are cold cathode fluorescent lamp.

7. A liquid crystal display according to claim 1, wherein the visible light source is white light emitting diode, and the infrared source is infrared light emitting diode in the backlight module.

8. A liquid crystal display according to claim 1, wherein the wavelength of the infrared emitted from the infrared source ranges from 650 nm to 1100 nm.

9. A liquid crystal display according to claim 1, wherein the photo sensors are made up of diodes which can detect the radiation of 650˜

1100 nm wavelength.

10. A liquid crystal display according to claim 1, wherein the photo-sensors are made up of thin film transistors.

11. A liquid crystal display according to claim 10, wherein the thin film transistors of the photo-sensors operate under a forward bias voltage applied between the source and the drain of the thin film transistor.