Touch display device comprising sense electrode with sub-electrodes extending along a first direction defining a pitch between sub-electrodes

• US 10,042,451 B2
• Filed: 11/30/2015
• Issued: 08/07/2018
• 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
• Primary Examiner(s): Eisen, Alexander
• Assistant Examiner(s): LAM, NELSON C
• Application Number:
  US14/954,818
• Publication Number:
  US 20160085350A1
• Time in Patent Office: 981 Days
• Field of Search: 345173-179
• 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 touch display device, comprising:

a substrate;

a plurality of sub-pixels disposed on the substrate; and

a first sense electrode disposed on the substrate, wherein the first sense electrode is corresponding to the plurality of sub-pixels, and the first sense electrode comprises;

a first sub-electrode extended along a first direction;

a second sub-electrode extended along the first direction and adjacent to the first sub-electrode; and

a third sub-electrode extended along the first direction and adjacent to the second sub-electrode,

wherein the first sub-electrode, the second sub-electrode, and the third sub-electrode are directly connected, the second sub-electrode is disposed between the first sub-electrode and the third sub-electrode, there is no sub-electrode located between the first sub-electrode and the second sub-electrode, and there is no sub-electrode located between the second sub-electrode and the third sub-electrode,

wherein a pitch between the first sub-electrode and the second sub-electrode in a second direction perpendicular to the first direction is defined as a first pitch, a pitch between the second sub-electrode and the third sub-electrode in the second direction is defined as a second pitch, and the second pitch is greater than the first pitch.

2. The touch display device as claimed in claim 1, wherein the first sense electrode further comprises a fourth sub-electrode along the first direction, the fourth sub-electrode and the first sub-electrode are directly connected, the first sub-electrode is disposed between the second sub-electrode and the fourth sub-electrode, a pitch between the first sub-electrode and the fourth sub-electrode is defined as a third pitch, and the third pitch is different from the second pitch.

3. The touch display device as claimed in claim 2, wherein the third pitch is greater than the second pitch.

4. The touch display device as claimed in claim 2, further comprising a plurality of dummy electrodes along the first direction, wherein the plurality of dummy electrodes are disposed between the first sub-electrode and the fourth sub-electrode, and the plurality of dummy electrodes are not connected to the first sub-electrode, the second sub-electrode, the third sub-electrode, and the fourth sub-electrode.

5. The touch display device as claimed in claim 1, further comprising a second sense electrode disposed on the substrate, wherein the second sense electrode is corresponding to the plurality of sub-pixels, and the second sense electrode is crossed with the first sense electrode.

6. The touch display device as claimed in claim 1, wherein the first sense electrode senses a capacitance signal which varies in a presence of a touch input.

7. The touch display device as claimed in claim 1, further comprising a plurality of color filters disposed on the substrate and corresponding to the plurality of sub-pixels.

8. The touch display device as claimed in claim 1, further comprising a display layer disposed on the substrate and corresponding to the plurality of sub-pixels, wherein the display layer comprises a liquid crystal layer.

9. The touch display device as claimed in claim 1, further comprising a display layer disposed on the substrate and corresponding to the plurality of sub-pixels, wherein the display layer comprises a plurality of organic light emission diodes.