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Display drive circuit of LCD screen

A driving circuit and display driving technology, applied in static indicators, instruments, etc., can solve the problems of complicated operation, increase the cost of LCD display screen, and cannot directly drive STN type LCD display screen, etc. Effect

Inactive Publication Date: 2012-02-29
江苏航顺集成电路技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The generation of these analog signals generally requires a dedicated LCD driver. Traditional digital signal processing devices such as single-chip microcomputers, DSPs, and FPGA / CPLDs cannot directly drive STN-type LCD displays. Add additional LCD screen driver chip
The versatility of the dedicated driver chip is not strong, and the use of the driver chip is complicated to operate, which increases the cost of using the LCD display

Method used

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  • Display drive circuit of LCD screen
  • Display drive circuit of LCD screen
  • Display drive circuit of LCD screen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Such as figure 1 As shown: the digital output driving circuit U1 is a three-state gate circuit, and the digital output driving circuit U1 includes an output terminal out1, an input terminal IN1 and a control terminal EN1. When the control terminal EN1 and the input terminal IN1 of the digital output driving circuit U1 can be directly connected to the output terminal of a processor such as a single chip microcomputer, the control terminal EN1 and the input terminal IN1 can receive digital signals. When the control terminal EN1 of the digital output driving circuit U1 is at a high level, when the input at the input terminal IN1 is also at a high level, the output terminal out1 of the digital output driving circuit U1 is also at a high level; when the input at the input terminal IN1 is at a high level When the level is low, the output terminal out1 of the digital output driving circuit U1 is at zero level; when the control terminal EN1 of the digital output driving circuit...

Embodiment 2

[0016] Such as figure 2 Shown: in order to meet the requirements of the 1 / 3VDD or 2 / 3VDD voltage reference of the COM terminal or SEG terminal of the LCD screen, a resistor R3 is provided at the end of the resistor R2 corresponding to the connection with the ground, and one end of the resistor R3 is connected to the resistor R2 connected, and the other end is grounded. The resistor R3 is provided with a digital output drive circuit U2 corresponding to the end connected to the resistor R2, and the digital drive output circuit U2 is also a tri-state gate circuit. The digital output driving circuit U2 cooperates with the digital output driving circuit U1 so that the driving output terminal can output voltage references of 1 / 3VDD and 2 / 3VDD.

[0017] Such as figure 2 As shown: when the control terminal EN1 of the digital output driving circuit U1 is at a high level, and when the input terminal IN1 of the digital output driving circuit U1 is at a low level, regardless of the st...

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PUM

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Abstract

The invention relates to a display drive circuit of an LCD screen, comprising a digital output drive circuit, wherein the digital output drive circuit comprises an output end, an input end and a control end; the input end and the control end of the digital output drive circuit are used for receiving digital signals; the input end and the control end of the digital output drive circuit ensure thatthe output end outputs a zero level, a high level or a high-resistance state by corresponding digital signals; the output end of the digital output drive circuit comprises a resistor R1 and a resistor R2, wherein one end of the resistor R1 and one end of the resistor R2 are connected with the output end of the digital output drive circuit; the other end of the resistor R1 is connected with a power supply, and the other end of the resistor R2 is grounded; and the resistor R1 corresponds to an end connected with the output end of the digital output drive circuit and the resistor R2 to form the drive output end of a display drive circuit. The invention has simple drive mode, is safe and reliable, can reduce use cost and is convenient to use.

Description

technical field [0001] The present invention relates to a driving circuit, in particular to a display driving circuit for an LCD screen, in particular to a display driving circuit for an STN (Super Twisted Nematic) or TN (Twisted Nematic) type LCD screen. Background technique [0002] At present, the application of STN LCD has been very extensive, such as calculators, watches, instruments, portable players (MP3, simple mobile phones) and other fields. The driving method of STN type LCD is quite special. It is composed of a set of SEG (segment line) signals and a set of COM (common line) signals. The voltage signal is not a digital waveform, but an analog waveform composed of several voltage steps according to a certain timing. , and these waveforms are different according to different display contents. The generation of these analog signals generally requires a dedicated LCD driver. Traditional digital signal processing devices such as single-chip microcomputers, DSPs, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/36G09G3/20
Inventor 范建林唐伟范卫东史训男王开
Owner 江苏航顺集成电路技术有限公司