Position encoded sensing device and a method thereof

• US 7,385,594 B2
• Filed: 02/19/2004
• Issued: 06/10/2008
• Est. Priority Date: 02/19/2004
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Liao, Chen-Hsien, Tseng, Hsu-Ping
• Primary Examiner(s): DHARIA, PRABODH M
• Application Number:
  US10/780,702
• Publication Number:
  US 20050184964A1
• Time in Patent Office: 1,573 Days
• Field of Search: 345/175, 345/178, 345/174, 345/55, 345/74, 345/76, 345/80, 345/104, 345179-183, 345/102, 455/12.1, 342/386, 342/385, 340/995, 382/186, 341/5, 347/3, 361/93.1
• US Class Current: 345/173
• CPC Class Codes: G02B 6/0038 Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
• CPC Class Codes: G02B 6/0046 Tapered light guide, e.g. wedge-shaped light guide
• CPC Class Codes: G02B 6/0058 varying in density, size, shape or depth along the light guide
• CPC Class Codes: G06F 3/03545 Pens or stylus
• CPC Class Codes: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen

Abstract

A position encoded sensing device having a display panel, a light guiding layer disposed on the display panel. The light guiding layer is configured to have encoded information therein. In addition, the position encoded sensing device includes a transceiver for detecting light and the encoded information that are guided out of the light guiding layer.

Claims

1. A position encoded sensing device comprising:

an LCD display panel;

a light guiding layer disposed on the display panel, wherein the light guiding layer includes;

a transparent light guiding plate, disposed on a surface of the LCD display panel, wherein the transparent light guide layer has a width and length dimension substantially similar to the LCD display panel;

at least one light source disposed at one side edge of the light guiding plate; and

wherein the light guiding plate is configured to have encoded information therein; and

a transceiver for detecting light and the encoded information that are outputted from the light guiding layer.

2. The device of claim 1, wherein the light guiding layer further comprises:

a light guiding face disposed within the light guiding plate, wherein the light guiding face is configured to optimally guide the encoded information and light from the at least one light source out of the light guiding plate.

3. The device of claim 2, wherein the light guiding face is configured to include the encoded information.

4. The device of claim 2, wherein the light guiding face includes at least one light guiding surface configured to optimally guide the encoded information and light from the at least one light source out of the light guiding plate.

5. The device of claim 2, wherein the light guiding face includes at least one light guiding serrated surface configured to optimally guide the encoded information and light from the at least one light source out of the light guiding plate.

6. The device of claim 2, wherein the light guiding face includes at least one light guiding inverse-V surface configured to optimally guide the encoded information and light from the at least one light source out of the light guiding plate.

7. The device of claim 1, wherein the encoded information comprises at least one display position code information.

8. The device of claim 1, wherein the transceiver comprises a detector for detecting the light and the encoded information that are outputted from the light guiding layer, and a filter for filtering the light.

17. The system for sensing a position on a display according to claim 1, wherein the LCD display panel is rectangular.

9. A method of sensing a position on a display, said method comprising the steps of:

displaying information on an LCD display panel;

positioning a transceiver proximately to the display panel;

emitting light from at least one light source disposed at a side edge of a light guiding layer;

guiding the light with encoded information out of a transparent light guiding layer, wherein the transparent light guiding layer is disposed on a surface of the LCD display panel;

detecting the light and the encoded information outputted from the light guiding layer at the transceiver; and

processing the encoded information detected by the transceiver.

10. The method of claim 9, wherein the step of guiding the light comprises the step of:

guiding the light with encoded information formed on a light guiding face of the light guiding layer.

11. The method of claim 9, wherein the step of guiding the light comprises the step of:

guiding the light with display position code information formed on a light guiding face of the light guiding layer.

12. The method of claim 9, wherein the step of processing comprises the step of:

determining a position of the transceiver with respect to the display panel based on the detected encoded information.

18. The system for sensing a position on a display according to claim 9, wherein the LCD display panel is rectangular.

19. The system for sensing a position on a display according to claim 18, wherein the transparent light guide layer has a width and length dimension substantially similar to the LCD display panel.

13. A system for sensing a position on a display comprising:

a display means for displaying information on an LCD display panel;

a positioning means for positioning a transceiver proximately to the display panel;

an emitting means for emitting light from at least one light source disposed at a side edge of a transparent light guiding layer;

wherein the transparent light guiding layer is disposed on a surface of the LCD display panel;

a light guiding means for guiding the light with encoded information out of light guiding layer;

a detecting means for detecting the light and the encoded information guided out of the light guiding layer at the transceiver; and

a processing means for processing the encoded information detected by the transceiver.

14. The system of claim 13, wherein the light guiding means guides the light with encoded information that are formed on a light guiding face of the light guiding layer.

15. The system of claim 13, wherein the light guiding means guides the light with display position code information formed on a light guiding face of the light guiding layer.

16. The system of claim 13, wherein the processing means comprises:

a

determining means for determining a position of the transceiver with respect to the display panel based on the detected encoded information.

20. The system for sensing a position on a display according to claim 13, wherein the LCD display panel is rectangular.

21. The system for sensing a position on a display according to claim 20, wherein the transparent light guide layer has a width and length dimension substantially similar to the LCD display panel.