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Touch screen touch point location detection circuit, touch screen and display device

A detection circuit and positioning detection technology, applied in measuring devices, optical devices, electrical digital data processing, etc., can solve the problems that capacitive touch screens cannot meet the requirements of practical applications, etc.

Inactive Publication Date: 2013-06-26
HEFEI BOE OPTOELECTRONICS TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, capacitive embedded touch screens are developing rapidly and are popular, but capacitive touch screens are mainly suitable for small and medium-sized display devices, such as products with a size of 10 inches or less. For larger-sized display devices, Capacitive touch screens cannot meet practical application requirements

Method used

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  • Touch screen touch point location detection circuit, touch screen and display device
  • Touch screen touch point location detection circuit, touch screen and display device
  • Touch screen touch point location detection circuit, touch screen and display device

Examples

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Embodiment Construction

[0028] Embodiments of the present invention provide a touch point location detection circuit of a touch screen, a touch screen and a display device, so as to realize an optical embedded touch screen.

[0029] The following briefly introduces the optical touch screen.

[0030] Optical touch screens are generally divided into infrared type, embedded type and projection type. The optical touch screen provided by the embodiment of the present invention is an in-cell touch screen under natural light.

[0031] In the embedded touch screen under natural light provided by the embodiment of the present invention, a photosensitive element senses the change of the light intensity of the touch point on the screen to determine the position of the touch point.

[0032] The present invention is proposed relative to the traditional capacitive in-cell touch screen.

[0033] In the embodiment of the present invention, a touch sensing sub-circuit for sensing a touch point is embedded in the di...

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PUM

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Abstract

The invention discloses a touch screen touch point location detection circuit, a touch screen and a display device. The touch screen touch point location detection circuit, the touch screen and the display device aim at achieving an optical type embedded type touch screen. The detection circuit comprises a touch sensing sub circuit, a detection sub circuit connected with the touch sensing sub circuit, and a first touch drive electrode wire and a second touch drive electrode wire. The touch sensing sub circuit comprises a capacitor, a first switch transistor and a second switch transistor. A grid and a source electrode of the first switch transistor are connected with the touch drive electrode wire. A drain electrode of the first switch transistor is connected with a drain electrode of the second switch transistor. A source electrode of the second switch transistor is connected with the detection sub circuit. A grid of the second switch transistor is connected with the second touch drive electrode wire. One end of the capacitor is connected with the drain electrode of the first switch transistor. The other end of the capacitor is connected with an electrode wire which provides high level voltage. The first switch transistor is an optical switch transistor.

Description

technical field [0001] The invention relates to the technical field of touch display, in particular to a touch point location detection circuit of a touch screen, a touch screen and a display device. Background technique [0002] As an input medium, a touch panel (TP) is integrated with a display screen as an in-cell touch panel. The in-cell touch panel plays an important role in the display field. The mutual capacitive touch screen is favored by people because of its high sensitivity and advantages of multi-touch. [0003] Classified according to the principles, touch screens generally include: resistive touch screens, capacitive touch screens, optical sensing touch screens, and the like. Classified according to the composition and structure, the touch screen roughly includes: an out-cell touch panel with the touch screen mounted on the display panel, an on-cell touch panel with the touch sensing unit on the display panel, and an on-cell touch panel in the touch sensor uni...

Claims

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Application Information

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IPC IPC(8): G06F3/044
CPCG06F3/0412G06F3/042G01B11/14
Inventor 谷晓芳胡明
Owner HEFEI BOE OPTOELECTRONICS TECH
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