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Current mirror circuit, display drive circuit, display device

A current mirror and circuit technology, applied in the fields of current mirror circuits, display drive circuits, and display devices, can solve the problems of large current mirror error and difficulty in ensuring that Vds are completely phased, etc.

Active Publication Date: 2019-02-12
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Obviously, in the actual working process of the circuit, it is difficult to ensure that the V of each MOS tube ds are exactly equal, so the mirror error of the current is larger

Method used

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  • Current mirror circuit, display drive circuit, display device
  • Current mirror circuit, display drive circuit, display device
  • Current mirror circuit, display drive circuit, display device

Examples

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Embodiment Construction

[0063] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms, and should not be construed as being limited to the embodiments set forth herein; on the contrary, these embodiments are provided so that this disclosure will be comprehensive and complete, and fully convey the concept of the example embodiments To those skilled in the art. The described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to give a sufficient understanding of the embodiments of the present disclosure. However, those skilled in the art will realize that the technical solutions of the present disclosure can be practiced without one or more of the specific details, or other methods, components, materials, devices, steps, etc. can be used. In other cases, well-known technic...

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Abstract

The invention provides a current mirror circuit, a display drive circuit and a display device. The current mirror circuit comprises a first transistor, a second transistor, a third transistor, a fourth transistor, an operational amplifier, a fifth transistor, a sixth transistor, a seventh transistor and an eighth transistor. Equivalence of a current ratio of an input end and an output end to a ratio of a width-length ratio of the first transistor and a width-length ratio of the third transistor can be guaranteed, current mirror errors are reduced, and current mirror precision is improved.

Description

Technical field [0001] The present disclosure relates to the field of integrated circuit technology, and in particular to a current mirror circuit, a display drive circuit, and a display device. Background technique [0002] The current mirror circuit is the most basic circuit in analog integrated circuits. It can mirror a given drive source current according to a certain ratio, so that the output current is completely the same as the drive current. Current mirror circuits generally have high resolution, high output impedance, and high tracking speed when the input current changes. Therefore, current mirror circuits have been widely used in the design of analog and digital circuits. [0003] Such as figure 1 As shown, the cascode (cascode) current mirror circuit includes 4 MOS tubes. When the 4 MOS tubes are all working in saturation, according to the saturation current calculation formula: [0004] Where u is the mobility, Is the aspect ratio, V gs Is the gate-source voltage, V...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F3/26
CPCG05F3/26
Inventor 王糖祥宋琛
Owner BOE TECH GRP CO LTD