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Self-adjusting circuit for exactly matching reference current between chips

A technology of reference current and adjustment circuit, applied in the direction of instruments, static indicators, etc., can solve the problems of the accuracy of the driving current and the effect of the color effect of the LCD screen display.

Inactive Publication Date: 2012-07-04
深圳市科铭实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the accuracy of the driving current has a great influence on the final display color effect of the LCD screen.

Method used

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  • Self-adjusting circuit for exactly matching reference current between chips
  • Self-adjusting circuit for exactly matching reference current between chips
  • Self-adjusting circuit for exactly matching reference current between chips

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Embodiment Construction

[0017] These and other advantages of the present invention will become apparent upon reading the following detailed description of the aspects, including the description of the accompanying drawings. The present invention will be described in detail below in conjunction with the accompanying drawings.

[0018] figure 1 It is a circuit block diagram of the first embodiment of the present invention, including: bias current part 1, bandgap reference voltage source part 2, voltage generating circuit part 3, switching circuit part 4, comparator part 5, current source part 6, PMOS Part 7, resistor part 8.

[0019] The present invention will be described below for a typical example of an OLED driving circuit.

[0020] OLED is an organic electroluminescent material, and its luminous brightness is related to the magnitude of the current passing through it and the duration of the current. Therefore, when two chips are cascaded to drive an OLED screen, if there is a current deviation ...

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PUM

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Abstract

The invention relates to the field of integrated circuits, and in particular discloses a self-adjusting circuit for exactly matching reference current between chips. In the implementation process, a chip is configured as a master chip, the other chip is configured as a slave chip and the voltage in the master chip is fed back to the slave chip, so that the problem of deviation of the reference current deviation caused by deviation of an integrated circuit technique when the two chips are cascaded. The circuit can be applied to a system requiring cascade connection of the two chips and exact equality of the reference current of the two chips, such as an OLED display driving chip requiring to realize an Qvga (320*240RGB) resolution.

Description

technical field [0001] The present invention relates to high voltage regulation circuits for use in integrated circuits. The circuits included in the present invention relate more particularly to liquid crystal display devices and related analog integrated circuit technology. The present invention is applicable to a system requiring two chips to be used in cascade connection, and the reference currents of the two chips must be exactly equal, such as OLED display driving chips with large resolution (320*240RGB resolution and higher). Background technique [0002] OLED is a newly emerging category in display panels and is known as "dream display". OLED has many outstanding features such as ultra-thin, self-luminous, fast response, good temperature characteristics, and flexible display. Manufacturers in the industry believe that it is only a matter of time before OLED replaces LCD in the future. [0003] OLED display technology is different from traditional LCD display method...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/32G09G3/3208
Inventor 王富中林丰成李家栋林昕
Owner 深圳市科铭实业有限公司