Level shift circuit, level shift circuit driving method and pixel driving circuit

A technology of level shifting and driving power, applied in the direction of instruments, static indicators, etc., can solve the problems that the driving method is not simple and effective, the circuit structure is not simple enough, etc., and achieves a simple and effective driving method, simple structure and high reliability. Effect

Active Publication Date: 2015-11-25
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the current level shift circuit structure, the positive and negative levels are converted step by step. For example, only VDD is raised to VGH in the first stage conversion circuit, and GND is lowered to VGL in the second stage conversion circuit. The circuit The structure is not simple enough, the driving method is not simple and effective enough, and there is still room for improvement

Method used

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  • Level shift circuit, level shift circuit driving method and pixel driving circuit
  • Level shift circuit, level shift circuit driving method and pixel driving circuit

Examples

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Embodiment 1

[0042] This embodiment provides a level shift circuit. The level shift circuit uses simple control logic to transform the input signal Input into the output signal Output, so as to realize the conversion of a small-amplitude level signal to a large-value level signal. conversion.

[0043] In this embodiment, a level shifting circuit applicable to a gate driver is taken as an example for illustration. like figure 1 As shown, the level shift circuit includes a control unit 1, a selection unit 2 and an output unit 3, wherein:

[0044] The control unit 1 is connected to the power supply, the input signal terminal and the selection unit 2, and is used to generate a control signal opposite to the input signal, and transmit the control signal to the selection unit 2; the positive level in the selection unit 2 can be controlled by the control unit 1 The switching on and off of the negative level path or the negative level path is convenient for the subsequent switching on and off of...

Embodiment 2

[0066] This embodiment provides a level shift circuit driving method corresponding to the level shift circuit in Embodiment 1, which can amplify the voltage and use the amplified voltage to drive pixels, wherein the level shift circuit includes a control Unit 1, selection unit 2 and output unit 3, the driving method includes a stage of outputting a positive voltage and a stage of outputting a negative voltage, wherein:

[0067] In the positive voltage output stage: the input signal and the positive logic voltage of turning on the power enter the control unit 1, and the control signal opposite to the input signal is generated in the control unit 1. Under the control of the control signal, the selection unit 2 selects the polarity corresponding to the turning on of the power. The high-level power supply of the driving power supply is output through the output unit 3;

[0068] In the negative voltage output stage: the input signal and the negative logic voltage of turning on the ...

Embodiment 3

[0078] Correspondingly, this embodiment provides a pixel driving circuit, which includes the level shift circuit of Embodiment 1 and adopts the driving method of the level shift circuit of Embodiment 2.

[0079] The pixel drive circuit has high reliability and can better realize display, and is especially suitable for being applied to a gate drive circuit in a liquid crystal display device LCD. Among them, the high-level signal VGH and the low-level signal VGL are the control levels acting on the gate drive terminal of the TFT-LCD pixel. When VGH is valid, the thin film transistor corresponding to the control pixel is turned on, and the new pixel data voltage Write pixel capacitance; when the VGL level is valid, control the thin film transistor corresponding to the pixel to turn off, so as to ensure that the pixel data voltage of this row is not modified.

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Abstract

The invention belongs to the field of display technologies, and particularly relates to a level shift circuit, a level shift circuit driving method and a pixel driving circuit. The level shift circuit comprises a control unit, a selection unit and an output unit, wherein the control unit is connected with a turn-on power supply, an input signal end and the selection unit, and is used for generating control signals which are opposite to input signals and transmitting the control signals to the selection unit; the selection unit is connected with a driving power supply and the output unit, and is used for receiving the control signals, generating selection signals corresponding to the control signals and transmitting the selection signals to the output unit, wherein the control signals are used for controlling the selection unit to select a polarity end of the driving power supply corresponding to the polarity of the turn-on power supply; and the output unit is connected with the driving power supply, and is used for receiving the selection signals and outputting voltage of the driving power supply polarity corresponding to the polarity of the turn-on power supply. The level shift circuit provided by the invention is simple in structure, and the driving method is simple, effective and high in reliability.

Description

technical field [0001] The invention belongs to the field of display technology, and in particular relates to a level shift circuit, a driving method thereof, and a pixel driving circuit. Background technique [0002] Currently, the most common flat panel display devices include a liquid crystal display device (Liquid Crystal Display, LCD for short) and an organic light-emitting diode display device (Organic Light-Emitting Diode, OLED for short). In the display area of ​​the flat panel display device, it includes a plurality of pixel areas surrounded by cross-arranged gate lines and data lines, and a thin film transistor for controlling display is arranged in each pixel area; The driving of the driving unit realizes the image display of pixels. The drive unit includes a gate driver and a source driver. The gate driver is used to scan and open the multi-channel RGB pixels belonging to the same row in the display, and the source driver is used to provide display data for the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36G09G3/32
Inventor 苏国火汪建明孙志华刘宝玉张旭张志豪张洪林
Owner BOE TECH GRP CO LTD
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