Integrated self-capacitive touch display
AssigneeMicrosoft Corporation
InventorPasi Pylvas
Life of this patent
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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.
Claims20
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.
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.
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.
Dependencies are inferred from the claim text.