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An improved OLED pixel driving circuit

A technology of pixel driving circuit and driving circuit, which is applied in the direction of instruments, static indicators, etc., can solve the problem of unable to display the sampling signal stably and so on.

Pending Publication Date: 2019-05-31
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the purpose of this patent is to provide an OLED pixel drive circuit, when the brightness is close to the "black level" in the sampling phase, to solve the problem that the OLED cannot display the sampling signal stably

Method used

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  • An improved OLED pixel driving circuit
  • An improved OLED pixel driving circuit
  • An improved OLED pixel driving circuit

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Embodiment Construction

[0011] Such as figure 1 It is a driving circuit diagram of a single pixel unit, which consists of three parts: DAC and buffer, sample and hold circuit, and pixel circuit. The 8-bit DAC converts the digital signal (video signal) into a current I1, and the current I flowing into N1 is the sum of the currents of I1 and I2 to generate a voltage V1; when the Sample is high, the voltage V1 is sampled to the capacitor C1 through the buffer ; When Hold and Sample-row become low, the current I3 controlled by V1 flows from P1 to N1', and the corresponding voltage V3 is stored on capacitor C2; when hold-row becomes low, Sample-row changes from low to high , At the same time, the top plate of C2 is connected to the high reference VBH, according to the charge conservation, the gate voltage of P1 is raised, and I4 is used to drive OLED to emit light.

[0012] When sampling several dimmest brightnesses, the current I is very small, the gate voltage of N1 cannot be charged or discharged to t...

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Abstract

The invention relates to an improved pixel driving circuit scheme. A slew rate enhancement circuit for organic light emitting diode (OLED) micro-display design. Due to the fact that the basic pixel unit area of the OLED micro display is only hundreds of square micrometers, the driving current of the pixel circuit is only hundreds of picos to tens of nanoamperes. When the gray scale is very low, aconversion rate enhancement circuit is inserted into an original circuit, the circuit current of the built-in reference voltage is very low and is easily influenced by the noise of the switch transistor, and an isolator needs to be added between the reference voltage and the M1 switch transistor to isolate the noise generated by the switch transistor. This improvement helps to achieve a better display effect of the OLED when the brightness is close to the darkest level.

Description

technical field [0001] This patent relates to the field of display technology, especially for OLED pixel drive circuits. Background technique [0002] Organic Light Emitting Diode (OLED) display devices have many advantages such as wide viewing angle, high brightness, high contrast, good color reproduction, low operating voltage, fast response, low cost, wide operating temperature range, and high luminous efficiency. In addition, OLED can also be combined with CMOS technology and integrated on CMOS silicon substrate to provide high optical performance and low power consumption microdisplay. Compared with non-emitting liquid crystal displays, OLEDs are self-emitting devices, so no separate light source is required in microdisplay applications, and power consumption is greatly reduced. Therefore, OLED is considered to be one of the most promising display technologies in the future. [0003] As we all know, in the design of micro-display driving circuit, the current of OLED p...

Claims

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Application Information

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IPC IPC(8): G09G3/3208
Inventor 唐莹王玉龙刘祖刚赵红韦一柏沁园杨媚
Owner CHINA JILIANG UNIV