METHOD FOR A TOUCH PANEL TO GENERATE A TOUCH SIGNAL

• US 20130285936A1
• Filed: 08/09/2012
• Published: 10/31/2013
• Est. Priority Date: 04/27/2012
• Status: Abandoned Application

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Hsu, Yu-Min, Li, Yi-Min, Chang, Sheng-Yun, Jhou, Sin-Guo
• Application Number:
  US13/570,259
• Publication Number:
  US 20130285936A1
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/04182 Filtering of noise external to the device and not generated by digitiser components
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

A touch panel includes a plurality columns of sensing partitions, a plurality of driving lines, a plurality of sensing lines and a memory. A method for the touch panel to generate a touch signal includes sequentially inputting driving signals to the plurality of driving lines, reading a plurality of voltage values of one of the plurality columns of sensing partitions through one of the plurality of sensing lines, converting the plurality of voltage values into a plurality of digital values, calculating a mean of the digital values, and storing the coordinate of at least one digital value in a memory. The difference between the at least one digital value and the mean is larger than a predetermined value.

Claims

1. A method for a touch panel generating touch signals, the touch panel comprising a plurality of columns of sensing partitions, a plurality of driving lines, a plurality of sensing lines and a memory, the method comprising:

sequentially inputting driving signals to the plurality of driving lines;

reading a plurality of first voltage values of one of the plurality columns of sensing partitions through one of the plurality of sensing lines;

converting the plurality of first voltage values into a plurality of first digital values;

calculating a first mean of the first digital values; and

storing the coordinate of at least one first digital value larger than the first mean for a predetermined value in the memory.

2. The method of claim 1, further comprising storing a difference between the at least one digital value and the first mean in the memory.

3. The method of claim 1, further comprising generating a touch signal according to the coordinate of the at least one first digital value.

4. The method of claim 1, wherein converting the plurality of first voltage values into the plurality of first digital values, is using an analog-to-digital converter to convert the plurality of first voltage values into the plurality of first digital values.

5. The method of claim 1, further comprising if the sensing line is not a last sensing line, performing the following steps:

reading a plurality of second voltage values of a next column of sensing partitions of the plurality columns of sensing partitions through a next sensing line of the plurality of sensing lines;

converting the plurality of second voltage values into a plurality of second digital values;

calculating a second mean of the second digital values; and

storing the coordinate of at least one second digital value larger than the second mean for the predetermined value in the memory.

6. The method of claim 5, wherein the touch panel comprises n columns of sensing partitions and n sensing lines, a sensing line of the n sensing lines is a sensing line among a first sensing line to an (n−

1)th sensing line of the n sensing lines, and a next sensing line of the n sensing lines is a sensing line among a second sensing line to an nth sensing line of then sensing lines.

7. The method of claim 5, further comprising storing the difference between the at least one second digital value and the second mean in the memory.

8. The method of claim 5, further comprising generating a touch signal according to the difference between the at least one first digital value and the first mean.

9. The method of claim 5, wherein converting the plurality of second voltage values into the plurality of second digital values is using an analog-to-digital converter to convert the plurality of second voltage values into the plurality of second digital values.

10. The method of claim 1, further comprising if the sensing line is a last sensing line of the plurality of sensing lines, sequentially inputting the driving signals to the plurality of driving lines.

11. The method of claim 10, wherein the touch panel comprises n columns of sensing partitions and n sensing lines, a last sensing line of the n sensing lines is an nth sensing line, the method further comprises reading a plurality of third voltage values of a first column of sensing partition of the n columns of sensing partitions through a first sensing line of the n sensing lines, where n is a positive integer.