Integrated self-capacitive touch display
First Claim
Patent Images
1. A method for operating a display stack comprising, comprising:
- providing a display stack comprising a single common voltage layer and an electrode array layer, the single common voltage layer being configured to operate as both;
(1) a common voltage layer with a first voltage to operate the display stack in a display addressing mode, and (2) a guard layer with a second voltage to operate the display stack in a touch measurement; and
providing a single voltage synchronization signal to a touch control module, the single voltage synchronization signal configured for operating as the common voltage layer during the display addressing mode and the guard layer during the touch measurement mode,wherein the single voltage synchronization signal causes switching of the voltage signal driving the common voltage layer from the first voltage to the second voltage.
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Abstract
A display 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.
18 Citations
20 Claims
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1. A method for operating a display stack comprising, comprising:
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providing a display stack comprising a single common voltage layer and an electrode array layer, the single common voltage layer being configured to operate as both;
(1) a common voltage layer with a first voltage to operate the display stack in a display addressing mode, and (2) a guard layer with a second voltage to operate the display stack in a touch measurement; andproviding a single voltage synchronization signal to a touch control module, the single voltage synchronization signal configured for operating as the common voltage layer during the display addressing mode and the guard layer during the touch measurement mode, wherein the single voltage synchronization signal causes switching of the voltage signal driving the common voltage layer from the first voltage to the second voltage. - View Dependent Claims (2, 3)
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4. An electronic display comprising:
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a single common voltage layer in a display stack, the single common voltage layer configured to provide a fixed voltage to operate as both;
(1) a common voltage layer with a fixed voltage to operate a display stack in a display addressing mode, and (2) a guard layer with an oscillating voltage to operate the display stack in a touch measurement mode;an electrode array layer arranged at a distance on top of the single common voltage layer of the display stack; at least one processor and a memory storing instructions executable to generate a single synchronization signal configured to cause the single common voltage layer to cycle between operating as the common voltage layer during the display addressing mode and the guard layer during the touch measurement mode. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12)
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13. A display structure, comprising:
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a display stack comprising a single common voltage layer and an electrode array layer, the single common voltage layer being configured to operate as both;
(1) a common voltage layer with a fixed voltage to operate the display stack in a display addressing mode and, (2) a guard layer with an oscillating voltage to operate the display stack in a touch measurement mode;the electrode array layer arranged at a distance on top of the single common voltage layer on the display stack; and a touch control element coupled to the single common voltage layer and to the electrode array layer, wherein the touch control element causes the single common voltage layer to cycle between operating as the common voltage layer during the display addressing mode and the guard layer during the touch measurement mode. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification