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High-precision current scaling circuit applied to display driving and scaling method

A display-driven, high-precision technology, applied in the direction of electrical components, etc., can solve problems such as consistency effects

Pending Publication Date: 2020-10-23
天津中科新显科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a common current mirror current scaling circuit is used, it will have different current scaling ratios under different input current conditions, which will have a greater impact on the consistency of the final display

Method used

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  • High-precision current scaling circuit applied to display driving and scaling method
  • High-precision current scaling circuit applied to display driving and scaling method
  • High-precision current scaling circuit applied to display driving and scaling method

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Embodiment Construction

[0020] In order to better understand the present invention, the present invention will be further described below in conjunction with specific embodiments and accompanying drawings.

[0021] Such as figure 2 As shown, the present invention provides a high-precision current scaling circuit applied to display driving, including a current mirror scaling circuit 10, and a compensation circuit 30 connected to the output end of the current mirror scaling circuit 10, for adjusting the current mirror scaling circuit The voltage at the 10 output is compensated.

[0022] Existing current scaling circuits such as figure 1 As shown, it includes a current mirror scaling circuit 10a and a pixel unit circuit 20a connected to the current mirror scaling circuit 10a. The current mirror scaling circuit 10a adopts a basic current mirror structure, including a first transistor M1a and a second transistor M2a. A transistor M1a is diode-connected, and the input current I in flows through the dio...

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Abstract

The invention provides a high-precision current scaling circuit applied to display driving and a scaling method. The high-precision current scaling circuit applied to display driving comprises a current mirror scaling circuit and a compensation circuit connected to an output end of the current mirror scaling circuit, wherein the compensation circuit is used for compensating a voltage of the outputend of the current mirror scaling circuit. In the high-precision current scaling circuit, the compensation circuit is connected between the current mirror scaling circuit and a pixel unit circuit, and the voltage of the output end of the current mirror scaling circuit is compensated through the compensation circuit, so that drain-source voltages of two transistors in the current mirror scaling circuit are basically consistent, thereby guaranteeing that the current scaling circuit have a relatively precise current scaling ratio.

Description

technical field [0001] The invention relates to the technical field of current scaling, in particular to a high-precision current scaling circuit and scaling method applied to display driving. Background technique [0002] With the development of display technology in recent years, OLED (Organic Light-Emitting Diode onSilicon, Organic Light-Emitting Diode) panels have ultra-high contrast, faster response speed, wider viewing angle, wider color gamut and thinner And many other advantages, it has been favored by major display manufacturers, and many related products have been launched. Although the current flat panel display market is still dominated by LCD (Liquid Crystal Display, liquid crystal display), the proportion of OLED display panels is increasing year by year, and there is a trend of continuously squeezing the liquid crystal display market. [0003] The biggest difference between OLED and LCD is that OLED is an active light emitting device, and its luminous brightn...

Claims

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Application Information

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IPC IPC(8): H05B45/00H05B45/30
CPCH05B45/60H05B45/00Y02D10/00
Inventor 赵博华黄苒
Owner 天津中科新显科技有限公司