Liquid crystal display drive circuit

A liquid crystal driving circuit and driving voltage technology, applied in the direction of logic circuit connection/interface layout, optics, instruments, etc., can solve the problems of large through current or charging and discharging current, driving voltage and voltage fluctuation, and chip size influence, etc. Prevents shoot-through current from flowing through the output transistors, reduces the number, and realizes the effect of power consumption
CN1920931AInactive Publication Date: 2007-02-28SANYO ELECTRIC CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SANYO ELECTRIC CO LTD
Publication Date
2007-02-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

In the liquid crystal drive circuit of the present invention, each of the four output transistors ( TR1 to TR4 ) is provided with two control transistors for each output transistor, for a total of eight control transistors. According to the dot signal (DA) and the field signal (DF), the eight control transistors are turned on and off, and one output transistor is selected from the four output transistors ( TR1 to TR4 ). By sharpening the rising edges of (DFp, DFBp) and the falling edges of (DFn, DFBn) applied to the output transistors ( TR1 to TR4 ), the output transistors are shifted from on to off earlier. Further, by slowing the falling edge of (DFp, DFBp) and the rising edge of (DFn, DFBn), each output transistor is delayed from OFF to ON. Therefore, in the liquid crystal drive circuit, the number of transistors in the output control circuit is greatly reduced, and the power consumption is reduced and the drive voltage is stabilized.
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Description

technical field

[0001] The invention relates to a liquid crystal drive circuit, in particular to a drive circuit for an STN-LCD panel (STN-LCD is a super twisted nematic liquid crystal). Background technique

[0002] Generally speaking, the driving circuits for STN-LCD panels are divided into two types: common driver and segment driver. The common driver and the segment driver output multi-bit driving signals to corresponding data lines (row lines or column lines), and each bit has 4 output transistors. By turning on one of these output transistors, the other The output transistor is turned off, and the drive voltage of any one of the four drive voltages V1, V2, V3, and V4 is output. A liquid crystal capacitor is formed at the intersection of the row line and the column line, and the liquid crystal display of dot matrix is ​​performed by applying the driving voltage to the liquid crystal capacitor.

[0003] FIG. 4 is a circuit diagram showing a one-bit output control circu...

Claims

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