Detecting and protecting circuit used in liquid crystal display device for avoiding liquid crystal polarization
A technology of liquid crystal display device and liquid crystal display panel, which is applied to static indicators, instruments, etc., and can solve the problems of abnormal control signal output by timing controller and unstable output voltage of low voltage drop voltage regulator, etc.
Inactive Publication Date: 2013-07-24
INNOLUX CORP
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Problems solved by technology
[0007] (3) The output voltage of the low-drop voltage regulator is unstable, which in turn causes the timing controller to output abnormal control signals
Method used
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[0052] In order to describe the display method and display of the display of the present invention, the following detailed examples are used to illustrate, but the scope of rights of the present invention is not limited to the following examples.
[0053] Referring to FIGS. 2A and 2B , they are schematic diagrams of a detection and protection circuit applied in a liquid crystal display device to prevent polarization of liquid crystals according to a first preferred embodiment of the present application. As shown in FIGS. 2A and 2B , the switch 220 is electrically connected to the input voltage V of the external circuit via a fuse (fuse) 210 cc . The DC / DC converter 230 is electrically connected to the switch 220 and receives an input voltage V from an external circuit. cc , to perform DC voltage conversion to obtain the output voltage V aa , the output voltage V aa It is provided to the subsequent DC conversion module (for example, the charge pump circuit 270 ) and the data...
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The invention relates to a detecting and protecting circuit used in a liquid crystal display device for avoiding liquid crystal polarization. The liquid crystal display device comprises a liquid crystal display panel, a scanning driving circuit, a data driving circuit and a time schedule controller, is electrically connected with a data driver and a scanning driver, transmits image data signals to the data driving circuit according to time sequence settings, and sends scanning control signals to the scanning driving circuit simultaneously; the liquid crystal display panel and a DC / DC converter are driven by the scanning driving circuit and the data driving circuit so as to receive input voltage from an external circuit and carry out DC voltage conversion for obtaining output voltage, thussupplying the working voltage required by the data driving circuit and the scanning driving circuit. The detecting and protecting circuit comprises a switch which is electrically connected between the input voltage of the external circuit and the DC / DC converter and a detecting circuit which is electrically connected with the output terminal of the DC / DC converter.
Description
technical field [0001] The invention relates to a detection and protection circuit, in particular to a detection and protection circuit applied in a liquid crystal display device to prevent liquid crystal polarization. Background technique [0002] Referring to FIG. 1 , it is a schematic diagram of a circuit structure of a conventional liquid crystal display device. As shown in FIG. 1 , the liquid crystal display device 100 includes a low dropout (LDO, Low Drop-out) voltage regulator 110, a DC / DC converter 120, a timing controller (Timing controller) 130, a charge pump circuit 140, a scan The driving circuit 150 , the data driving circuit 160 and the liquid crystal display panel 170 . The low dropout voltage regulator 110 receives an input voltage V from an external circuit cc Perform voltage regulation, and then provide the operating voltage V to the timing controller 130 dd . The DC / DC converter 120 receives an input voltage V from an external circuit cc Perform DC vo...
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IPC IPC(8): G09G3/36G02F1/133
Inventor 潘明嘉萧百宏潘树林
Owner INNOLUX CORP