INTEGRATED SELF-CAPACITIVE TOUCH DISPLAY

• US 20160098114A1
• Filed: 10/01/2014
• Published: 04/07/2016
• Est. Priority Date: 10/01/2014
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Pylvas, Pasi
• Granted Patent: US 10,209,834 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 3/04166 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 3/0443 using a single layer of sensing electrodes
• 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: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters

Abstract

Adisplay with integrated self-capacitance sensors comprises a sensor electrode and a guard layer in the display stack. Touch displays combine internally elements required for the display function and the touch sensing function. In an embodiment, the common voltage layer, VCOM layer, is used as the guard layer and another layer on top of the common voltage layer, for example a color filter layer, is used as the electrode array layer. The functionality of the common voltage layer is alternated between the touch sensing function and the display function. Either function may be used while the other function is disabled.

Claims

1. A method for a display, comprising:

a display stack, a common voltage layer on the display stack and an electrode array layer on the display stack;

setting the display for a display addressing mode by driving the common voltage layer to a predefined voltage level;

setting the display for a touch measurement mode by driving the common voltage layer to drive a touch input and setting the display for a quiet period; and

detecting the touch by self-capacitance between the common voltage layer and the electrode array layer arranged at a distance on top of the common voltage layer on the display stack.

2. A method according to claim 1, wherein the electrode array layer is arranged on top of a color filter layer.

3. A method according to claim 1, wherein the electrode array layer is arranged between the adhesive layer and the window layer.

4. An electronic display comprising:

a common voltage layer;

an electrode array layer arranged at a distance on top of the common voltage layer on the display stack;

at least one processor and a memory storing instructions that, when executed, cause the display to alternate between the display addressing mode and the touch measurement mode wherein, in the touch measurement mode. the touch is detected by self-capacitance between the common voltage layer and the electrode array layer.

5. An electronic display according to claim 4, wherein a touch control element causes the display to alternate between the display addressing mode and the touch measurement mode.

6. An electronic display according to claim 4, wherein a display driver module and a touch control module connected to the display driver module cause the display to alternate between the display addressing mode and the touch measurement mode.

7. An electronic display according to claim 4, comprising a display driver module and a touch control module connected to the display driver module, wherein the display driver module causes the touch control module to measure the change in capacitance between the common voltage layer and the electronic sensor array in the touch measurement mode.

8. An electronic display according to claim 4, comprising a display driver module connected to the common voltage layer and a touch control module connected to the electrode array layer and to the display driver module, wherein the display driver module provides a DC signaling for the common voltage layer in the display addressing mode and an AC signaling for the common voltage layer in the touch measurement mode.

9. An electronic display according to claim 4, comprising a touch control module connected to the common voltage layer and to the electrode array layer;

and a display driver module connected to the touch control module, wherein the signal received from the display driver module causes the touch control module to drive the common voltage layer in the touch measurement mode.

10. An electronic display according to claim 4, comprising a touch control module connected to the common voltage layer and to the electrode array layer;

and a display driver module connected to the touch control module, wherein the touch control module provides a DC signaling for the common voltage layer in the display addressing mode and an AC signaling for the common voltage layer in the touch measurement mode.

11. An electronic display according to claim 4, wherein the electrode array layer is arranged on top of a color filter layer.

12. An electronic display according to claim 4, wherein the electrode array layer is arranged between the adhesive layer and the window layer.

13. A display structure, comprising:

a display stack, a common voltage layer on the display stack and an electrode array layer on the display stack;

the electrode array layer arranged at a distance on top of the common voltage layer on the display stack, wherein the electrode array senses touch by self-capacitance;

a touch control element coupled to the common voltage layer and to the electrode array layer, wherein the touch control element causes the common voltage layer to alternate between the display addressing mode and the touch measurement mode.

14. A display structure according to claim 13, wherein the touch control element comprises a display driver module and a touch control module connected to the display driver module causes the display to alternate between the display addressing mode and the touch measurement mode.

15. A display structure according to claim 13, wherein the touch control element comprises a display driver module and a touch control module connected to the display driver module, wherein the display driver module causes the touch control module to measure the change in capacitance between the common voltage layer and the electronic sensor array in the touch measurement mode.

16. A display structure according to claim 13, wherein the touch control element comprises a display driver module connected to the common voltage layer and a touch control module connected to the electrode array layer and to the display driver module, wherein the display driver module provides a DC signaling for the common voltage layer in the display addressing mode and an AC signaling for the common voltage layer in the touch measurement mode.

17. A display structure according to claim 13, wherein the touch control element comprises a touch control module connected to the common voltage layer and to the electrode array layer;

and a display driver module connected to the touch control module, wherein the signal received from the display driver module causes the touch control module to drive the common voltage layer in the touch measurement mode.

18. A display structure according to claim 13, wherein the touch control element comprises a touch control module connected to the common voltage layer and to the electrode array layer;

and a display driver module connected to the touch control module, wherein the touch control module provides a DC signaling for the common voltage layer in the display addressing mode and an AC signaling for the common voltage layer in the touch measurement mode.

19. A display structure according to claim 13, wherein the electrode array layer is arranged on top of a color filter layer.

20. A display structure according to claim 13, wherein the electrode array layer is arranged between the adhesive layer and the window layer.