Touch screen including P-type transistor and applied with programmable voltage
AssigneeG2Touch Co., Ltd.
InventorHyung Guel Kim
Life of this patent
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Abstract
An object of the present invention is to efficiently reduce the number of signal lines of a control port and an input port of a sensor switch required for controlling a touch by supplying a programmable voltage from a touch drive IC TDI, not a separate external voltage source, as a voltage applied to a touch sensor. The present invention provides a touch screen which is capable of implementing low power consumption, low-resistance signal wiring, touch IC price reduction, and the like by forming a switching transistor of the sensor switch only with a P-type transistor manufactured in a Low Temperature Poly Silicon (LTPS) process, and driving the switching transistor without using a negative voltage (−V).
Claims16
A touch screen, comprising:
- a plurality of touch sensors which are maintainable in a sensing state and a driving state;
- a plurality of sensor switches, each of which independently controls a state of a corresponding one of the plurality of touch sensors and includes a first P-type transistor, a first capacitor, a second P-type transistor, and a second capacitor wherein the first capacitor connects a gate and a source of the first P-type transistor and the second capacitor connects a gate and a source of the second P-type transistor;
- a plurality of multiplexers (MUXs) which group the plurality of touch sensors into a plurality of groups and divide each of the plurality of groups into a plurality of blocks to control the plurality of touch sensors in a unit of a block;
- and
- a touch drive IC which detects a touch based on touch capacitance generated by at least one or more touch sensors in the sensing state, or provides a voltage applied to the plurality of touch sensors in the driving state.
Dependencies are inferred from the claim text.