TOUCH-SENSING DISPLAY DEVICE

• US 20150103031A1
• Filed: 10/15/2013
• Published: 04/16/2015
• Est. Priority Date: 10/15/2013
• Status: Active Grant

• Current Assignee: Himax Technologies Ltd. (Himax Technologies Incorporated)
• Original Assignee: Himax Technologies Ltd. (Himax Technologies Incorporated)
• Inventors: Liu, Jui-Ming, Liu, Li-Lin, Chang, Chung-Wen, Tai, Shen-Feng
• Granted Patent: US 9,310,945 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/04186 Touch location disambiguation
• 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-sensing display device comprises a plurality of row electrodes and column electrodes, a capacitance detector, detecting first capacitance-variation values of the row electrodes and second capacitance-variation values of the column electrodes, and detecting third capacitance-variation values of each intersection of the row electrodes and the column electrodes. The processor counts the first number of the first and second capacitance-variation values, exceeding a first threshold, counts the second number of the first and second capacitance-variation values up to a maximum capacitor-variation value, and counts the third number of the third capacitance values, exceeding a second threshold. The processor makes the touch-sensing display device enter a bending mode when the first and second numbers are over a first predetermined number and a second predetermined number respectively, and the third number is below the first number. The processor further raises the second threshold when entering the bending mode.

Claims

1. A touch-sensing display device, comprising:

a plurality of row electrodes and column electrodes;

a capacitance detector, detecting first capacitance-variation values of each of the row electrodes with respect to a reference and second capacitance-variation values of each of the column electrodes with respect to the reference, and detecting third capacitance-variation values of each intersection of the row electrodes and the column electrodes; and

a processor, carrying out a first operation to determine the entering of a bending mode, according to the first, second and third capacitance-variation values;

in the first operation, the processor counting the first number of the first and second capacitance-variation values which exceed a first threshold, counting the second number of the first and second capacitance-variation values which are up to a maximum capacitor-variation value, and counting the third number of the third capacitance values which exceed a second threshold;

the processor making the touch-sensing display device enter the bending mode when the first and second numbers are over a first predetermined number and a second predetermined number respectively, and the third number is below the first number;

the processor carrying out a second operation to raise the second threshold when the touch-sensing display device is in the bending mode.

2. The touch-sensing display device as claimed in claim 1, wherein

in the first operation, the processor further counting a fourth number of third capacitance-variation values which are up to the maximum capacitor-variation value;

the processor making the touch-sensing display device enter the bending mode when the first and second numbers are over a respectively, the third number is below the first number, and the fourth number is over a third predetermined number.

3. The touch-sensing display device as claimed in claim 1, wherein the touch-sensing display device further has the functions of Palm Rejection and Recalibration;

when the processor is making the touch-sensing display device enter the bending mode, the processor disables the functions of Palm Rejection and Recalibration.

4. The touch-sensing display device as claimed in claim 1, wherein the capacitor detector further comprises:

a self-sensing channel, detecting the first capacitance-variation values and the second capacitance-variation values and transmitting the detection results to the processor; and

a mutual sensing channel, detecting the third capacitance-variation values and transmitting the detection results to the processor.

5. The touch-sensing display device as claimed in claim 1, wherein the processor defines the region where the first capacitance-variation values of the row electrodes exceed the first threshold and the second capacitance-variation values of the column electrodes exceed the first threshold as a bending zone and defines the rest of the region as a non-bending zone and the processor raises the second threshold of the bending zone.

6. A method for reducing the misreporting of the touch point of a touch-sensing display device, comprising:

providing a plurality of row electrodes and column electrodes;

detecting first capacitance-variation values of each of the row electrodes with respect to a reference and second capacitance-variation values of each of the column electrodes with respect to the reference, and detecting third capacitance-variation values of each intersection of the row electrodes and the column electrodes;

counting the first number of the first and second capacitance-variation values which exceed a first threshold, counting the second number of the first and second capacitance-variation values which are up to a maximum capacitor-variation value, and counting the third number of the third capacitance values which exceed a second threshold, in the first operation;

carrying out a first operation to determine the entering of a bending mode, according to the first, second and third capacitance-variation values;

making the touch-sensing display device enter the bending mode when the first and second numbers are over a first predetermined number and a second predetermined number respectively, and the third number is below the first number; and

carrying out a second operation to raise the second threshold when the touch-sensing display device is in the bending mode.

7. The method for reducing the misreporting of the touch point of the touch-sensing display device as claimed in claim 6, further comprising:

counting a fourth number of third capacitance-variation values which are up to the maximum capacitor-variation value;

making the touch-sensing display device enter the bending mode when the fourth number is over a third predetermined number.

8. The method for reducing the misreporting of the touch point of the touch-sensing display device as claimed in claim 6, wherein the touch-sensing display device further has the functions of Palm Rejection and Recalibration;

disabling the functions of Palm Rejection and Recalibration when making the touch-sensing display device enter the bending mode.

9. The method for reducing the misreporting of the touch point of the touch-sensing display device as claimed in claim 6, further comprising:

defining the region where the first capacitance-variation values of the row electrodes exceed the first threshold and the second capacitance-variation values of the column electrodes exceed the first threshold as a bending zone, defining the rest of the region as a non-bending zone, and the processor raising the second threshold of the bending zone.