TOUCH INPUT DEVICE

• US 20160085350A1
• Filed: 11/30/2015
• Published: 03/24/2016
• Est. Priority Date: 04/30/2008
• Status: Active Grant

• Current Assignee: InnoLux Corporation
• Original Assignee: InnoLux Corporation
• Inventors: EDWARDS, Martin John, AYRES, John Richard, BRAMANTE, Nicola
• Granted Patent: US 10,042,451 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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
• CPC Class Codes: G06F 3/047 using sets of wires, e.g. crossed wires

Abstract

A touch sensor input device includes a first and second array of electrodes, the electrodes in the first array being orthogonal to the electrodes in the second array. A capacitor sensing arrangement senses an electrode capacitance signal which varies in the presence of a touch input. The capacitance signals for groups of electrodes in each array are combined in order to derive respective individual sense signals. This arrangement has electrodes with a finer resolution than the sensing resolution, and this gives improved ability to sense accurately the position of the touch input.

Claims

1. A display device with touch sensor input, the display device comprising an array display pixels or an array of display sub-pixels with groups of sub-pixels together defining respective display pixels, the display device comprising:

a display layer; and

a touch sensor input device for enabling a touch input to the device, wherein

the touch sensor input device comprises;

a first and second arrays of electrodes, wherein each of the first and second arrays of electrodes includes a plurality of groups of electrodes, and each of the groups of electrodes includes a plurality of sub-electrodes, the sub-electrodes of one group of the first array are electrically connecting to each other, and

wherein the pitch of the sub-electrodes is the same as a pixel or sub-pixel pitch of the display device, and

wherein the touch sensor input device further comprises a plurality of dummy electrodes which are not used to derive any individual sense signals and are arranged between two adjacent groups of electrodes of the first array or of the second array, the dummy electrodes has a distribution width less than a pitch of the two adjacent groups of electrodes.

2. The display device as claimed in claim 1, wherein the sub-electrodes close to an edge of the first array or the second array in a sensor area use a different pattern compared to the sub-electrode group patterns away from the edge.

3. The display device as claimed in claim 1, wherein at least two groups of the Sub-electrodes are positioned parallel to each other.

4. The display device as claimed in claim 1, wherein the pitch of the two adjacent groups of electrodes is less than a distribution width of one of the two adjacent groups of electrodes.

5. The display device as claimed in claim 1, wherein the touch sensor input device further comprises a plurality of first and second arrays of electrodes.

6. The display device as claimed in claim 1, wherein the sub-electrodes of one group of the first array are electrically connecting to each other.

7. The display device as claimed in claim 1, wherein the touch sensor input device further comprises:

a capacitor sensing arrangement for sensing an electrode capacitance signal which varies in the presence of the touch input,

wherein the electrode capacitance signals for groups of the electrodes in each array are combined in order to derive respective individual sense signals.

8. The display device as claimed in claim 7, wherein the different individual sense signals are each derived from different groups of electrodes.

9. The display device as claimed in claim 1, wherein the electrodes of a group are physically electrically connected together.

10. The display device as claimed in claim 1, wherein the groups of the first array have the same pitch.

11. The display device as claimed in claim 1, wherein the groups of the second array have the same pitch.

12. The display device as claimed in claim 1, further comprising a color filter arrangement.

13. The display device as claimed in claim 1, wherein the display layer comprises a liquid crystal layer.