Display device including sensing elements and driving method thereof

• US 20060033011A1
• Filed: 08/02/2005
• Published: 02/16/2006
• Est. Priority Date: 08/02/2004
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Joo-Hyung, Park, Jong-Woung, Uh, Kee-Han, Choi, Young-Jun
• Application Number:
  US11/195,322
• Publication Number:
  US 20060033011A1
• Time in Patent Office: Days
• US Class Current: 250/208.200
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/041661 using detection at multiple resolutions, e.g. coarse and fine scanning; using detection within a limited area, e.g. object tracking window
• CPC Class Codes: G06F 3/042 by opto-electronic means

Abstract

A method of detecting a two-dimensional position of a touch exerted on an information display panel is provided. The display panel includes a plurality of sensing elements. The two-dimensional position of the touch may be represented by first and second coordinates. The method includes determining a range for the first coordinate of the two-dimensional position by driving a first group of the sensing elements and determining the second coordinate of the two-dimensional position by driving a second group of the sensing elements, the second group of the sensing elements included in the first group of the sensing elements.

Claims

1. A method of detecting a two-dimensional position of a touch, the touch represented by a first and a second coordinate and exerted on an information display panel including a plurality of sensing elements, the method comprising:

determining a range for the first coordinate of the two-dimensional position by driving a first group of the sensing elements; and

determining the second coordinate of the two-dimensional position by driving a second group of the sensing elements, the second group of the sensing elements being included in the first group of the sensing elements.

2. The method of claim 1, wherein the range for the first coordinate is equivalent to the first coordinate.

3. The method of claim 2, wherein the driving of the first group of the sensing elements comprises simultaneously driving the first group of the sensing elements.

4. The method of claim 3, wherein the second group of the sensing elements is equivalent to the first group of the sensing elements.

5. The method of claim 4, wherein the driving of the second group of the sensing elements comprises sequentially driving the second group of the sensing elements.

6. The method of claim 1, wherein the range for the first coordinate is wider than the first coordinate.

7. The method of claim 6, further comprising determining the first coordinate from the range for the first coordinate.

8. The method of claim 7, wherein the first group of the sensing elements further comprises a third group of the sensing elements and a fourth group of the sensing elements, the determination of the range for the first coordinate further comprising:

simultaneously driving the third group of the sensing elements to obtain first sensing data;

simultaneously driving the fourth group of the sensing elements to obtain second sensing data; and

comparing the first sensing data and the second sensing data to determine the range for the first coordinate.

9. The method of claim 8, wherein the first group of the sensing elements further comprises a fifth group of the sensing elements and a sixth group of the sensing elements, the fifth and the sixth groups comprising parts of the sensing elements in the third and the fourth groups, the determination of the range for the first coordinate further comprising:

simultaneously driving the fifth group of the sensing elements to obtain third sensing data;

simultaneously driving the sixth group of the sensing elements to obtain fourth sensing data; and

comparing the third sensing data and the fourth sensing data to determine the range for the first coordinate.

10. The method of claim 7, wherein the determination of the first coordinate comprises reducing the range for the first coordinate by repeatedly driving a reduced number of the first group of the sensing elements.

11. The method of claim 1, wherein the sensing elements generate output signals in response to an incident light.

12. The method of claim 1, wherein the sensing elements generate output signals in response to pressure applied on the display panel.

13. The method of claim 1, wherein the information display panel is selected from a liquid crystal display, an organic light emitting diode display, and a plasma display panel.

14. A method of detecting a two-dimensional position of a touch exerted on an information display panel including a plurality of sensing elements, the method comprising:

determining a range of a first coordinate and a range of a second coordinate by driving a first number of the sensing elements; and

determining the first and the second coordinates by driving a second number of the sensing elements, the second number being less than the first number.

15. The method of claim 14, wherein the determination of the first and the second coordinates comprises reducing the ranges for the first and the second coordinates by repeatedly driving a reduced number of the first number of the sensing elements.

16. A method of driving a display device, the display device including a display panel for detecting a touched position on the display panel, the display panel including a plurality of scanning lines, a plurality of data lines, and a plurality of sensing units coupled to the scanning lines and the data lines, the method comprising:

simultaneously applying scanning signals to the scanning lines;

generating first one-dimensional digital data based on output signals of the sensing units;

extracting an x-coordinate of the touched position by applying a position detection algorithm to the first digital data;

sequentially applying scanning signals to the scanning lines;

reading sensing data signals from one of the data lines corresponding to the x-coordinate the data lines;

generating second one-dimensional digital data based on the sensing data signals; and

extracting a y-coordinate of the touched position by applying a position detection algorithm to the second digital data.

17. The method of claim 16, wherein the simultaneous application applies all the scanning lines in the display panel.

18. The method of claim 17, wherein the extraction of the x-coordinate comprises:

determining whether a touch exists; and

extracting the x-coordinate when it is determined that a touch exists.

19. A method of driving a display device, the display device including a display panel for detecting a touched position on the display panel, the display panel including a plurality of scanning lines, a plurality of data lines, and a plurality of sensing units coupled to the scanning lines and the data lines, the method comprising:

setting an entire area of the display panel as a sensing area;

dividing the sensing area into a first sub-area and a second sub-area, the first sub-area and the second sub-area assigned to different scanning lines;

determining whether any one of the first and the second sub-areas is touched;

extracting a y-coordinate of the touched position in the first sub-area when it is determined that the first sub-area is touched; and

extracting an x-coordinate of the touched position by applying a scanning signal to a scanning line corresponding to the y-coordinate.

20. The method of claim 19, wherein the extraction of the y-coordinate comprises:

determining whether the first sub-area is divisible when it is determined that the first sub-area is touched;

setting the first sub-area as a new sensing area to be divided into new first and second sub-areas when it is determined that the first sub-area is divisible; and

extracting a y-coordinate of the first sub-area as the y-coordinate of the touched position when it is determined that the first sub-area is indivisible.

21. The method of claim 20, wherein the first sub-area and the second sub-area are substantially equivalent halves of the sensing area.

22. The method of claim 20, wherein the determination of whether any one of the first and the second sub-areas is touched comprises:

scanning the first sub-area to receive output signals from the sensing units in the first sub-area;

generating first one-dimensional digital data based on the output signals of the sensing units in the first sub-area;

scanning the second sub-area to receive output signals from the sensing units in the second sub-area;

generating second one-dimensional digital data based on the output signals of the sensing units in the second sub-area; and

comparing the first digital data and the second digital data to determine whether any one of the first and the second sub-areas is touched.

23. The method of claim 22, wherein the extraction of the x-coordinate comprises:

applying a scanning signal to a scanning line corresponding to the y-coordinate;

generating third one-dimensional digital data based on output signals from the sensing units coupled to the scanning line; and

applying a position detection algorithm to the third digital data to extract the x-coordinate of the touched position.

24. The method of claim 23, further comprising:

dividing the sensing area into a third sub-area and a fourth sub-area different from the first and second sub-areas and assigned to different scanning lines when it is determined that none of the first and the second sub-areas is touched;

determining whether any one of the third sub-area and the fourth sub-area is touched; and

extracting a y-coordinate of the touched position in the third sub-area when it is determined that the third sub-area is touched.

25. The method of claim 24, wherein the determination of whether any one of the third sub-area and the fourth sub-area is touched comprises:

scanning the third sub-area to receive output signals from the sensing units in the third sub-area;

generating third one-dimensional digital data based on the output signals of the sensing units in the third sub-area;

scanning the fourth sub-area to receive output signals from the sensing units in the fourth sub-area;

generating fourth one-dimensional digital data based on the output signals of the sensing units in the fourth sub-area; and

comparing the third digital data and the fourth digital data to determine whether any one of the third and the fourth sub-areas is touched.

26. A method of driving a display device, the display device including a display panel for detecting a touched position on the display panel, the display panel including a plurality of scanning lines, a plurality of data lines, and a plurality of sensing units coupled to the scanning lines and the data lines, the method comprising:

setting an entire area of the display panel as a sensing area;

dividing the sensing area into a plurality of sub-areas assigned to different scanning lines and different data lines;

determining whether any one of the sub-areas is touched; and

extracting x and y coordinates of the touched position in a sub-area when it is determined that the sub-area is touched.

27. The method of claim 26, wherein the extraction of the x and y coordinates comprises:

determining whether the sub-area is divisible when it is determined that the sub-area is touched;

setting the sub-area as a new sensing area to be divided into a plurality of new sub-areas when it is determined that the sub-area is divisible; and

extracting x and y coordinates of the sub-area as the x and y coordinates of the touched position when it is determined that the sub-area is indivisible.

28. The method of claim 26, wherein the sub-areas are arranged in a matrix.

29. The method of claim 26, wherein the determination of whether any one of the sub-areas is touched comprises:

scanning each of the sub-areas to receive output signals from the sensing units in the sub-areas;

generating a digital data for each of the sub-areas based on the output signals of the sensing units in the sub-areas; and

applying a position detection algorithm to the digital data to determine whether any one of the sub-areas is touched.

30. A display device comprising:

a display panel including a plurality of scanning lines, a plurality of data lines, a plurality of sensing units coupled to the scanning lines and the data lines; and

a detection unit detecting a two-dimensional position of a touch exerted on the display panel and represented by first and second coordinates,

wherein the detection unit determines a range for the first coordinate of the two-dimensional position by applying scanning signals to a first group of the scanning lines, and determines the second coordinate of the two-dimensional position by applying scanning signals to a second group of the scanning lines, the second group of the scanning lines being included in the first group of the scanning lines.

31. The display device of claim 30, wherein the detection unit comprises:

a scanning driver applying scanning signals simultaneously to at least two of the scanning lines;

a sensing signal processor generating digital data based on output signals from the sensing units; and

a signal controller dividing the display panel into a plurality of sub-areas and determining the first and second coordinates based on the digital data for the sub-areas.

32. The display device of claim 30, wherein the detection unit includes one of an integrated single chip, a flexible printed circuit in a tape carrier package, and combination at least one of the foregoing.

33. The display device of claim 30, wherein the sensing units generate the output signals in response to one of incident light, pressure and any combination including at least one of the foregoing.

34. The display device of claim 30, wherein the display device is selected from a liquid crystal display, an organic light emitting diode display, and a plasma display panel.