Light sensing element and liquid crystal display containing same

A technology of light sensing element and photosensitive unit, which can be used in static indicators, optics, instruments, etc., and can solve problems such as photocurrent attenuation.

Active Publication Date: 2012-02-01
HANNSTAR DISPLAY CORPORATION
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  • Abstract
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Problems solved by technology

However, figure 1 Since the phototransistor 96 in the photosensitive transistor 96 is continuously subjected to the common voltage of the common line 91, the photocurrent will be attenuated under long-term operation.
[0004] In view of this, it is necessary to propose a light-sensing element, which will not be affected by the operating time of the operating performance

Method used

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  • Light sensing element and liquid crystal display containing same
  • Light sensing element and liquid crystal display containing same
  • Light sensing element and liquid crystal display containing same

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Embodiment Construction

[0043] In order to make the above and other objects, features, and advantages of the present invention more apparent, a detailed description will be given below with reference to the accompanying drawings. In the description of the present invention, the same members are denoted by the same symbols.

[0044] In addition, only some components are shown in each diagram of the present invention and components not directly related to the description of the present invention are omitted.

[0045] refer to figure 2As shown, it shows the circuit diagram of the light sensing element of the first embodiment of the present invention. The light sensing element 10 includes a first wire 111, a second wire 112, a third wire 113, a reading switch 121, a photosensitive unit 122, and a charging switch 123; wherein, the reading switch 121 and the charging switch 113 can be, for example, thin films A transistor (thin film transistor), the photosensitive unit 122 can be, for example, a thin fi...

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PUM

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Abstract

The invention provides a light sensing element, which comprises a first lead, a second lead, a third lead, a reading switch, a charging switch and a sensitive unit, wherein a control end of the reading switch is electrically connected to the first lead, and a second end of the reading switch is electrically connected to the third lead; a control end of the charging switch is electrically connected to the first lead, and a first end of the charging switch is electrically connected to the second lead; the sensitive unit is electrically connected between a first end of the reading switch and a second end of the charging switch; and when the reading switch and the charging switch are turned on by the first lead, a light current is produced by the sensitive unit according to the electric potential of the second lead and the intensity of light incident into the sensitive unit, and arrives the third lead via the reading switch. The invention further provides a liquid crystal display.

Description

technical field [0001] The invention relates to a touch device, in particular to a light sensing element and a liquid crystal display including the light sensing element. Background technique [0002] Liquid crystal display is currently a widely used display device. With the maturity of touch screen technology, various mobile electronic devices, such as multimedia players, mobile phones and personal digital assistants (PDA), are almost equipped with touch-sensitive LCD screens. In order to increase the convenience of use; wherein, the optical touch screen detects the change of light intensity to locate the touch position. [0003] refer to figure 1 As shown, it shows a photosensitive element 9 of an optical touch panel in the prior art, which includes a data line 91, a scanning line 92, a reading line 93, a common line 94, a reading transistor 95 and a phototransistor 96 . The photosensitive transistor 96 will have different photocurrent outputs according to the received ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/133G02F1/1362G06F3/042
Inventor 张弘昌柯健专吴昭慧
Owner HANNSTAR DISPLAY CORPORATION
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