Display device with touch sensor
First Claim
1. A display device having a capacitive touch sensor, comprising:
- a plurality of display pixel electrodes;
a common electrode facing the display pixel electrodes;
a display function layer having an image display function;
a display control circuit that performs an image display control by applying a voltage for display between the display pixel electrode and the common electrode, based on an image signal, so that the display function of the display function layer is exhibited;
a pixel substrate, the pixel substrate including a circuit substrate in which the display control circuit is located;
an opposed substrate facing the pixel substrate, the display function layer being interposed between the pixel substrate and the opposed substrate; and
a touch detection electrode for the capacitive touch sensor, the touch detection electrode and the common electrode both being disposed in the pixel substrate and arranged such that a capacitance exists between the common electrode and the touch detection electrode,wherein,the common electrode is on the circuit substrate inside a display region,the touch detection electrode is on the circuit substrate in a frame region surrounding the display region, the touch detection electrode being separate from the common electrode, andthe common electrode and the touch detection electrode are formed along same plane on the circuit substrate such that the common electrode and the touch detection electrode are disposed side by side and the capacitance is formed between the common electrode and the touch detection electrode in a lateral direction that runs parallel to the plane on which both the touch detection electrode and the common electrode are located.
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Accused Products
Abstract
A common electrode 43 for display, which is originally provided in a liquid crystal display element, is also used as one (drive electrode) of a pair of electrodes for a touch sensor, and the other (detection-electrode-for-the-sensor 44) of the pair of electrodes is newly formed. An existing common drive signal Vcom as a drive signal for display is used in common for a drive signal for the touch sensor. A capacitance is formed between the common electrode 43 and the detection-electrode-for-the-sensor 44, and touch detection is performed by utilizing a change of this capacitance caused by a finger touch of a user. Thus, a display device with a touch sensor is also applicable to a mobile device in which electric potential of the user is inconstant in many cases. The newly-provided electrode is only the detection-electrode-for-the-sensor 44, and it is unnecessary to newly prepare a drive signal for the touch sensor. Therefore, the configuration is simple.
83 Citations
11 Claims
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1. A display device having a capacitive touch sensor, comprising:
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a plurality of display pixel electrodes; a common electrode facing the display pixel electrodes; a display function layer having an image display function; a display control circuit that performs an image display control by applying a voltage for display between the display pixel electrode and the common electrode, based on an image signal, so that the display function of the display function layer is exhibited; a pixel substrate, the pixel substrate including a circuit substrate in which the display control circuit is located; an opposed substrate facing the pixel substrate, the display function layer being interposed between the pixel substrate and the opposed substrate; and a touch detection electrode for the capacitive touch sensor, the touch detection electrode and the common electrode both being disposed in the pixel substrate and arranged such that a capacitance exists between the common electrode and the touch detection electrode, wherein, the common electrode is on the circuit substrate inside a display region, the touch detection electrode is on the circuit substrate in a frame region surrounding the display region, the touch detection electrode being separate from the common electrode, and the common electrode and the touch detection electrode are formed along same plane on the circuit substrate such that the common electrode and the touch detection electrode are disposed side by side and the capacitance is formed between the common electrode and the touch detection electrode in a lateral direction that runs parallel to the plane on which both the touch detection electrode and the common electrode are located. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification