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Photosensitive driving circuit, photosensitive driving method and display

A driving circuit and driving method technology, applied in static indicators, instruments, etc., can solve problems such as thin film transistors cannot be driven, thin film transistor current driving ability becomes smaller, and I-V curve characteristics drift

Inactive Publication Date: 2009-12-02
WINTEK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, since the thin film transistor of the photosensitive device is in the conduction state for a long time, there will be a shift in the I-V curve characteristic, which is called the stress effect (Stress Effect)
This phenomenon will cause the threshold voltage Vth of the thin film transistor to increase, making the current driving capability of the thin film transistor smaller
If the threshold voltage Vth of the thin film transistor is greater than a certain value, the thin film transistor cannot be driven, and the service life of the photosensitive device will be reduced.

Method used

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  • Photosensitive driving circuit, photosensitive driving method and display
  • Photosensitive driving circuit, photosensitive driving method and display
  • Photosensitive driving circuit, photosensitive driving method and display

Examples

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no. 1 example

[0042] Please refer to Figure 4 , Which is shown as a schematic diagram of a photosensitive device and a photosensitive driving circuit according to the first embodiment of the present invention. The aforementioned photosensitive driving circuit 122 and the photosensitive device 130 may be presented in various embodiments. In the first embodiment, the photosensitive device 130 includes a photosensitive element 132 and a current-to-voltage element 134, and the photosensitive driving circuit 122 includes a pulse width modulation (PWM) circuit 1222, an output buffer 1224, a burning unit 1225, The judgment unit 1226, the analog-digital converter 1227, the analog-digital converter 1228, and the detection unit 1229.

[0043] When the aforementioned figure 2 When the illustrated sensing signal S(m) is an induced voltage, the pulse width modulation circuit 1222 provides a pulse width modulation voltage Vpwm to drive the photosensitive element 132 of the photosensitive device 130, so tha...

no. 2 example

[0053] Please refer to Figure 5 , Which is shown as a schematic diagram of a photosensitive device and a photosensitive driving circuit according to the second embodiment of the present invention. In addition to the implementation of the first embodiment, the aforementioned photosensitive driving circuit 122 and the photosensitive device 130 can also be represented by the implementation of the second embodiment. In the second embodiment, the photosensitive device 130 includes a photosensitive element 132, and the photosensitive driving circuit 122 includes a current-to-voltage element 134, a pulse width modulation (Pulse Width Modulation, PWM) circuit 1222, an output buffer 1224, a burning unit 1225, The judgment unit 1226, the analog-digital converter 1227, the analog-digital converter 1228, and the detection unit 1229.

[0054] When the aforementioned figure 2 When the illustrated sensing signal S(m) is an induced current, the photosensitive device 130 of the second embodiment...

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Abstract

The invention relates to a photosensitive driving circuit, a photosensitive driving method and a display. The photosensitive driving circuit comprises a pulse width modulation circuit, a judgment unit and a first analog-digital converter, wherein the pulse width modulation circuit is used for providing pulse width modulation voltage to drive a photosensitive device to enable the photosensitive device to output an induction signal according to an outside light source; the judgment unit is used for judging whether detection and a program are carried out or not according to an external command; and if detection and a burning program are not needed, the first analog-digital converter outputs a digital signal according to the induction signal.

Description

Technical field [0001] The present invention relates to a photosensitive driving circuit, and more particularly to a photosensitive driving circuit, a photosensitive driving method and a display capable of extending the life of the photosensitive device. Background technique [0002] As the technology of display devices becomes more mature, more and more electronic devices integrate display devices with them, such as mobile phones or personal digital assistants. In this way, the user can not only view the image screen or text message from the display device, but also further operate the electronic device through the message displayed on the display device. [0003] In the known technology, in order to adjust the backlight brightness of the display device according to the ambient brightness of the external light source, a fixed voltage is used to directly drive the photosensitive device, and then the backlight brightness of the display device is adjusted according to the output si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/34
Inventor 赖志章王文俊
Owner WINTEK CORP