Touch panel

• US 8,325,155 B2
• Filed: 09/23/2009
• Issued: 12/04/2012
• Est. Priority Date: 06/16/2009
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Chang, Yu-Shuan, Huang, Hsueh-Ying, Chiang, Min-Feng
• Primary Examiner(s): Wong, K.
• Application Number:
  US12/565,062
• Publication Number:
  US 20100315377A1
• Time in Patent Office: 1,168 Days
• Field of Search: None
• US Class Current: 345/175
• CPC Class Codes: G06F 3/0386 for light pen
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/042 by opto-electronic means

Abstract

A touch panel is provided. The touch panel includes a plurality of pixels, wherein each pixel includes M*N sub-pixels, at least m sub-pixels each include at least one photo sensitive area and at least one effective display area, the other n sub-pixels each include only at least one effective display area, and M≧2, N≧1, m≦M, m+n=M and m≧0. A first color filter film is disposed over a photo sensor of the photo sensitive area and a second color filter film is disposed over the effective display area, wherein the color of the first and the second color filter films are different at the at least m sub-pixels. The photo sensors at the same column are electrically connected by a signal readout line, wherein only one signal readout line is disposed at every M column of the sub-pixels.

Claims

1. A touch panel, comprising:

a plurality of pixels, wherein each of the pixel includes M*N sub-pixels, and the M*N sub-pixels have at least m sub-pixels each containing at least one photo sensitive area and at least one effective display area, at least n other sub-pixels of the M*N sub-pixels each only contain at least one effective display area, and M≧

2, N≧

1, m≦

M, m+n=M and m≧

0, and the at least one photo sensitive area has at least one photo sensor;

a color filter disposed at the plurality of pixels, wherein the color filter contains a first color filter film disposed over the photo sensors of the at least m sub-pixels of the M*N sub-pixels, and a second color filter film disposed over the effective display areas of the at least m sub-pixels of the M*N sub-pixels and the effective display areas of the at least n other sub-pixels of the M*N sub-pixels, and the first color filter film disposed over the photo sensors of the at least m sub-pixels of the M*N sub-pixels have a color different from that of a color of the second color filter film disposed over the effective display areas of the at least m sub-pixels; and

a signal readout line electrically connecting the photo sensors at the same column, wherein only one signal readout line is disposed at every M columns of the sub-pixels.

2. The touch panel of claim 1, wherein the photo sensors are disposed parallel to a column of the sub-pixels or zigzagged along a vertical direction.

3. The touch panel of claim 1, wherein the first color filter film disposed over the photo sensors at the sub-pixels of an M^th column have a color mix substantially the same as a color mix of the first color filter film disposed over the photo sensors at the sub-pixels of an M*p^th column, or the first color filter film disposed over the photo sensors at the sub-pixels of the a N^th row have a color mix substantially the same as a color mix of the first color filter film disposed over the photo sensors at the sub-pixels of the a N*p^th row, and p≧

1.

4. The touch panel of claim 1, further comprising:

a first substrate;

a second substrate disposed opposite to the first substrate;

a display medium layer disposed between the first substrate and the second substrate;

a plurality of data lines and scan lines disposed crisscrossed on the first substrate to form the sub-pixels; and

a plurality of pixel electrodes disposed on the first substrate, wherein each of the pixel electrodes is disposed corresponding to each of the sub-pixels, and the photo sensors and the signal readout line are disposed on the first substrate.

5. The touch panel of claim 1, further comprising an input device being adapted to provide a light source with a plurality of frequency bands or colors to illuminate the touch panel, wherein the light source is sensed by the photo sensor when a frequency band or a color of the first color filter film disposed over the photo sensor contains the frequency band or the color of the light source.

6. A touch panel, comprising:

a plurality of pixels, wherein each of the pixels includes a*b sub-pixels, a≧

4 and b≧

1, and the a*b sub-pixels at least include a first sub-pixel, a second sub-pixel and a third sub-pixel, and wherein the first sub-pixel contains at least one photo sensitive area and at least one effective display area, the photo sensitive area contains at least one photo sensor, and the second sub-pixel and the third sub-pixel contain at least one effective display area;

a color filter disposed at the plurality of pixels, wherein the color filter contains a first color filter film covering the photo sensor of the first sub-pixel, and a second color filter film covering the effective display areas of the first, the second and the third sub-pixels; and

a signal readout line electrically connecting the photo sensors at the same column of the sub-pixels, wherein only one signal readout line is disposed at every a (a≧

4) columns of the sub-pixels.

7. The touch panel of claim 6, wherein each of the second sub-pixel and the third sub-pixel exclusively contain the at least one effective display area, the second color filter film contains a first, a second and a third sub-color filter film disposed at the effective display area of the first sub-pixel, the effective display area of the second sub-pixel and the effective display area of the third sub-pixel, and the first color filter film covering the photo sensor is selected from one of the first, the second and the third sub-color filter films.

8. The touch panel of claim 6, further comprising:

a first substrate;

a second substrate disposed opposite to the first substrate;

a display medium layer disposed between the first substrate and the second substrate;

a plurality of data lines and scan lines disposed crisscrossed on the first substrate to form the sub-pixels; and

a plurality of pixel electrodes disposed on the first substrate, wherein each of the pixel electrodes is disposed corresponding to each of the sub-pixel, and the photo sensors and the signal readout line are disposed on the first substrate.

9. The touch panel of claim 6, further comprising an input device for providing a light source with a plurality of colors to illuminate the touch panel, wherein the light source is sensed by the photo sensor when a color of the first color filter film disposed over the photo sensor is the same as the color of the light source.

10. A touch panel, comprising:

a plurality of sub-pixels, displaying A kinds of colors;

a plurality of photo sensors, sensing a light source having B kinds of colors, wherein A*B sub-pixels of the sub-pixels have B pieces of the photo sensors, and A≧

B and B≧

2;

a first color filter film disposed over the photo sensors;

a second color filter film disposed over an effective display area of the sub-pixels, wherein at the A*B sub-pixels, the first color filter film disposed over at least B−

1 pieces of the photo sensors has a color different from that of a color of the second color filter film disposed over the effective display area of the sub-pixel having the photo sensor therein; and

a signal readout line electrically connecting the photo sensors at the same column, wherein only one signal readout line is disposed at every A column of the sub-pixels.

11. The touch panel of claim 10, wherein the photo sensors are disposed parallel to a column of the sub-pixels or zigzagged along a vertical direction.

12. The touch panel of claim 10, wherein the photo sensors are disposed parallel to a row of the sub-pixels or zigzagged along a horizontal direction.

13. The touch panel of claim 10, further comprising:

a first substrate;

a second substrate disposed opposite to the first substrate;

a display medium layer disposed between the first substrate and the second substrate;

a plurality of data lines and scan lines disposed crisscrossed on the first substrate to form the sub-pixels; and

a plurality of pixel electrodes disposed on the first substrate, wherein each of the pixel electrodes is disposed corresponding to each of the sub-pixel, and the photo sensors and the signal readout line are disposed on the first substrate.

14. The touch panel of claim 10, further comprising an input device for providing a light source with a plurality of colors to illuminate the touch panel, wherein the light source is sensed by the photo sensor when a color of the first color filter film disposed over the photo sensor is the same as the color of the light source.

15. A touch panel, comprising:

a plurality of touch signal readout lines, wherein the touch signal readout lines at least contain a first signal readout line connecting to a plurality of photo sensors at the same column of sub-pixels of the touch panel, a left column and a right column of sub-pixels adjacent to the column of the sub-pixels with the first signal readout line therein have no signal readout line, and wherein the photo sensors at least contain a first photo sensor and a second photo sensor; and

a plurality of color filters disposed over the photo sensors, wherein the color filter disposed over the first photo sensor has a main frequency band which is different from that of a main frequency band of the color filter disposed over the second photo sensor.

16. The touch panel of claim 15, wherein the first photo sensor of the first signal readout line has a sensing readout time different from that of a sensing readout time of the second photo sensor of the first signal readout line.

17. The touch panel of claim 15, wherein the photo sensors of the first signal readout line further comprise a third photo sensor, and the color filters disposed over the first, the second and the third photo sensors has different main frequency bands.

18. The touch panel of claim 15, wherein the touch signal readout lines further comprise a second signal readout line connecting to a plurality of photo sensors, and the photo sensors at least contain a first photo sensor and a second photo sensor, and the color filter disposed over the first photo sensor of the first signal readout line has a main frequency band which is different from that of a main frequency band of the color filter disposed over the first photo sensor of the second signal readout line.

19. The touch panel of claim 15, wherein the touch signal readout lines further comprise a second signal readout line connecting to a plurality of photo sensors, and the photo sensors at least contain a first photo sensor and a second photo sensor, and the color filter disposed over the first photo sensor of the first signal readout line has a main frequency band that is the same as a main frequency band of the color filter disposed over the first photo sensor of the second signal readout line.

20. A touch panel, comprising:

a plurality of touch signal readout lines, wherein the touch signal readout lines at least contain a first signal readout line and a second signal readout line, each of the touch signal readout lines connect to each of a corresponding plurality of photo sensors at the same column of sub-pixels of the touch panel, at least one column of sub-pixels having no signal readout line therein is disposed between the first and the second signal readout lines, the photo sensors of the first signal readout line at least contain a first photo sensor and the photo sensors of the second signal readout line at least contain a first photo sensor; and

a plurality of color filters disposed over the photo sensors, wherein the color filter disposed over the first photo sensor of the first signal readout line has a main frequency band which is different from that of a main frequency band of the color filter disposed over the first photo sensor of the second signal readout line.

21. The touch panel of claim 20, wherein the touch signal readout lines further comprise a third signal readout line connecting to a plurality of photo sensors, the photo sensors at least contain a first photo sensor, and the color filters disposed over the first photo sensor of the first signal readout line, and the first photo sensor of the second signal readout line and the first photo sensor of the third signal readout line have different main frequency bands.

22. The touch panel of claim 20, wherein the first signal readout line further comprises a second photo sensor, and the color filters disposed over the first photo sensor and the second photo sensor of the first signal readout line have different main frequency bands.

23. The touch panel of claim 20, wherein the first signal readout line further comprises a second photo sensor, and the color filters disposed over the first photo sensor and the second photo sensor of the first signal readout line have the same main frequency bands.