Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Output buffering circuit, array substrate and display device

一种输出缓冲、电路的技术,应用在放大装置的零部件、电气元件、静态指示器等方向,能够解决没有反馈电路、稳定性差、功耗大等问题

Inactive Publication Date: 2014-05-14
BEIJING BOE DISPLAY TECH CO LTD +1
View PDF5 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the above figure 1 There is no feedback circuit in the circuit shown, and the suppression of output fluctuations cannot be achieved, resulting in large fluctuations in the output voltage and poor stability
In order to solve the problem of unstable output, the existing circuit generally needs to add a special voltage regulator circuit on the basis of the above-mentioned two-stage operational amplifier circuit to increase the chip area. At the same time, it is also necessary to increase the bias current of the output stage to increase the sink current. consumes a lot

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Output buffering circuit, array substrate and display device
  • Output buffering circuit, array substrate and display device
  • Output buffering circuit, array substrate and display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0035] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0036] At present, the normal output voltage of the output buffer circuit of the driving voltage VOFF of the TFT-LCD gate driver is -8V, and an external voltage stabilizing capacitor is required. Such as figure 1 As shown, the first-stage operational amplifier circuit is a differential input circuit composed of five transistors M1~M5, and the second-stage operational amplifier circuit uses a common-source amplifier circuit with an active load composed of two transistors M9 and M10. For higher gain and larger output voltage swing. In order to reduce the static power consumption and the bias current of M10 and M9 is small, the voltage negative feedback forms a unity-gain a...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an output buffering circuit which comprises a first-stage operational amplifying circuit, a second-stage operational amplifying circuit and a feedback circuit arranged between the first-stage operational amplifying circuit and the second-stage operational amplifying circuit. The first-stage operational amplifying circuit is used as a differential input circuit, the second-stage operational amplifying circuit is used as a common-source cascade amplifying circuit with an active load, and the feedback circuit is used for providing a bias voltage and having the driving capacity of alternatively providing a source current and a sink current. The first-stage operational amplifying circuit and the second-stage operational amplifying circuit form a unit gain amplifier through the feedback circuit, so that the whole circuit can have the driving capacity of alternatively providing the source current and the sink current. A special voltage stabilizing circuit is not required any more, the circuit structure is simple, the chip area can be reduced, power consumption can be further lowered due to the fact that the special voltage stabilizing circuit is not required any more, meanwhile, fluctuations of the output voltage can be restrained, the stability of the circuit during working is guaranteed, shifting is restrained to the maximum degree, an output signal is accurate, and a displayed image is good in quality.

Description

technical field [0001] The invention relates to the field of liquid crystal display, in particular to an output buffer circuit, an array substrate and a display device. Background technique [0002] Liquid crystal displays are more and more entering people's lives due to their portability, ultra-thin, multi-color and high-definition features, and occupy a dominant position in the display field. However, in today's display field, as the requirements for display resolution and pixel quality are getting higher and higher, the power consumption of the entire voltage drive circuit is also increasing, which affects the power consumption of the drive control chip and the picture of the LCD screen. Quality requirements are also getting higher and higher. [0003] At present, most mainstream panels use TFT-LCD (Thin Film Transistor-Liquid Crystal Display) technology to obtain better image quality and lower power consumption as possible. Since the output buffer circuit of the TFT-LC...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36
CPCH03F1/0261G09G3/3677G09G2310/0291H03F3/45183H03F2203/45674
Inventor 刘宝玉张亮许益祯孙志华
Owner BEIJING BOE DISPLAY TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products