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Light sensing type touching and controlling circuit and liquid crystal display thereof

A touch circuit and light-sensing technology, applied to static indicators, optics, instruments, etc., to avoid misjudgment and improve accuracy

Active Publication Date: 2012-07-11
AU OPTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention proposes a photosensitive touch circuit and its liquid crystal display. One or more touch reference units are arranged at unresolvable edge positions to provide a reference level for the touch sensing unit to perform calculations, and then Reduce or solve the problem that may cause misjudgment of the touch sensing unit

Method used

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  • Light sensing type touching and controlling circuit and liquid crystal display thereof
  • Light sensing type touching and controlling circuit and liquid crystal display thereof
  • Light sensing type touching and controlling circuit and liquid crystal display thereof

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Embodiment Construction

[0072] Please refer to figure 2 , figure 2 It is the circuit block diagram of the first embodiment of the present invention. Such as figure 2 As shown, the light-sensitive touch circuit 200 of the first embodiment of the present invention includes a light-sensing unit 20, a first signal reading unit 27, a touch reference unit 30, a second signal reading unit 37 and a touch sensor Measuring unit 84.

[0073] The photo-sensing unit 20 can be turned on or off according to the light intensity, so as to provide the first signal correspondingly. The first signal includes a first voltage and a second voltage. The light sensing unit 20 may include a light sensing element 22 and a first storage capacitor C1. In addition, for the convenience of illustration, figure 2 Only one photo-sensing unit 20 is shown in the figure. In fact, the number of photo-sensing units 20 can be adjusted (increased or decreased) according to the design requirements, and each photo-sensing unit 20 ca...

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PUM

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Abstract

Provided is a light sensing type touching and controlling circuit, comprising a light sensing unit allowed to switch on or off according to an illumination strength to accordingly provide a first signal comprising a first voltage and a second voltage; a first signal reading unit coupled with the light sensing unit and allowed to switch on or off according to a first operation time sequence to output the first signal; a touching and controlling reference unit arranged at one side of the light sensing unit and used for providing a reference voltage; a second signal reading unit coupled with the touching and controlling reference unit and allowed to switch on or off according to a second operation time sequence to output a reference voltage; and a touching and controlling sensing unit coupled with the first signal reading unit and the second signal reading unit, wherein the touching and controlling sensing unit determines whether the light sensing type touching and controlling circuit is touched using the level difference between the first signal and the reference voltage as one of bases.

Description

technical field [0001] The present invention relates to a touch sensing system and its display device, and in particular to a photosensitive touch circuit and its liquid crystal display device which can avoid misjudgment. Background technique [0002] At present, touch panel technology generally has the following types: resistive, capacitive, optical, electromagnetic, ultrasonic, and embedded LCD (LCD In-Cell, which can be divided into three types: resistive, capacitive, and optical. kind). In the display of the embedded light-sensitive touch panel, the difference in leakage current caused by different light intensities is used as the condition for whether the light-sensing element in the embedded light-sensitive touch panel is turned on, and then the embedded light is judged. Whether the touch panel is touched or not. [0003] For example, the photosensitive element includes thin film transistors and the like. The thin film transistor leakage current of the light sensing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/042G02F1/133
CPCG06F3/042G02F1/133G06F3/0416G06F3/0412G06F3/04166
Inventor 郑宜如徐雅玲钟岳宏黄雪瑛
Owner AU OPTRONICS CORP
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