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LCD boosted circuit

A technology of liquid crystal display and booster circuit, applied in static indicators, instruments, etc., can solve problems such as inaccurate output voltage and poor picture quality of liquid crystal display, and achieve the effect of avoiding crosstalk and ensuring picture quality

Inactive Publication Date: 2009-04-22
INNOCOM TECH (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In order to solve the problem in the prior art that the image quality of the liquid crystal display is not good due to the inaccurate output voltage of the liquid crystal display booster circuit, it is necessary to provide a liquid crystal display booster circuit with an accurate output voltage

Method used

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Examples

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Embodiment Construction

[0021] see figure 2 , is a schematic circuit diagram of the first embodiment of the liquid crystal display booster circuit of the present invention. The boost circuit 20 is arranged on the driving integrated circuit of the liquid crystal display, and it can provide multi-level voltages to drive the liquid crystal display to display, and the multi-level voltages are V op , V 1 , V 2 , V 3 , V 4 and V ss .

[0022] The boost circuit 20 includes a boost unit 22 , a voltage drop unit 24 , and a voltage divider unit 26 electrically connected in sequence. The step-up unit 22 receives a low-voltage voltage V from an external circuit ci converted into a high voltage V 1cd , and output it to the step-down unit 24. The step-down unit 24 takes the high voltage V 1cd converted into an operating voltage V op , and output to the voltage dividing unit 26. The voltage divider unit 26 is composed of a resistor R 4 , R 3 , R w , R 2 , R 1 are connected in series in sequence, wh...

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PUM

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Abstract

The utility model relates to a booster circuit for a liquid crystal display, which comprises a step-up unit, a step-down unit and a dividing unit that are serially connected in order. The utility model is characterized in that an input voltage from the external power supply is converted into a working voltage required as the power supply of liquid crystal display by the step-up unit and the step-down unit, the working voltage is divided in the a plurality of levels by the dividing unit which comprises a plurality of resistors and a direct current chopper circuit with the function of stepping and stepping down, wherein a resistor is variable, the direct current chopper circuit is connected to the voltage output terminals between the two neighboring resistors and between the resistor and the earthing terminal and steps up or steps down the output voltage, then the driving voltage at each level for driving the liquid crystal display to display are output.

Description

technical field [0001] The invention relates to a voltage boosting circuit for a liquid crystal display. Background technique [0002] With the wide application of liquid crystal displays, the industry has higher and higher requirements on the display quality of liquid crystal displays, especially in terms of anti-crosstalk (Crosstalk) capability of liquid crystal displays. The crosstalk phenomenon refers to a visible subordinate pattern generated by mutual interference of adjacent pixels, which is related to the characteristics of the liquid crystal display panel itself and the design performance of the drive integrated circuit (Drive Integrated Circuit), which seriously affects the display quality of the picture. [0003] FIG. 1 is a schematic circuit diagram of a liquid crystal display booster circuit in the prior art. The boost circuit 10 is arranged on the driving integrated circuit of the liquid crystal display, and it can provide multi-level voltages to drive the liq...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/133G09G3/36
Inventor 杜怀
Owner INNOCOM TECH (SHENZHEN) CO LTD