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AMOLED voltage external compensation method and system

An external compensation and voltage compensation technology, which is applied in the field of microelectronics, can solve problems such as adverse effects on display image quality, and achieve the effects of fast speed, increased duty cycle, and reduced time

Active Publication Date: 2013-08-28
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The difference in the threshold voltage of the drive tube and the electron mobility will have a negative impact on the quality of the displayed image

Method used

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  • AMOLED voltage external compensation method and system
  • AMOLED voltage external compensation method and system
  • AMOLED voltage external compensation method and system

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Embodiment

[0042] This embodiment provides an AMOLED voltage external compensation circuit, such as figure 1 and 2 As shown, the external compensation circuit is used to compensate the image signal input to the pixel array, so that the anode point voltage V of the OLED in each pixel unit in the pixel array OLED are equal to the reference voltage V ref , where V ref is based on V data_n The size of the OLED is determined, so the size of the brightness of each OLED in the pixel array is only related to the image signal V input to itself data_n It is related to the size of the TFT and has nothing to do with the threshold voltage and electron mobility of the driving TFT. figure 2 Among them, the pixel array includes M rows and N columns of pixel units, and both M and N are positive integers greater than or equal to 1.

[0043] The AMOLED voltage external compensation circuit includes: a reference voltage generator 10 , a comparator 20 , and a voltage compensation module 30 . Wherein, ...

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Abstract

The invention provides an AMOLED voltage external compensation method and circuit. The method includes the following steps of comparing the magnitude of a driving voltage of an OLED with the magnitude of a preset reference voltage through a comparator and beginning voltage compensation if the magnitude of the driving voltage of the OLED is less than the magnitude of the preset reference voltage. The voltage compensation includes the following steps of obtaining a voltage difference of between the driving voltage and the preset reference voltage through a subtractor, outputting a position signal of the comparator, looking up digital quantity which needs to be compensated, an output signal of the comparator and the position signal of the comparator according to the voltage difference, controlling a correction unit to correct an image signal which is input into the OLED according to the digital quantity through a voltage controller; conducting conversion on the corrected image signal through a digital-to-analog conversion module, obtaining a corrected image voltage signal and inputting the corrected image voltage signal to the OLED, repeating the voltage compensation process until the driving voltage is equal to the preset reference voltage, and stopping the voltage compensation. According to the AMOLED voltage external compensation method and circuit, a duty ratio of a pixel unit is improved, time for displaying an image is shortened, the luminance of the OLED is only related to the magnitude of Vdata_n, and the luminance of the OLED is not related to a threshold voltage which drives a TFT or electron mobility.

Description

technical field [0001] The invention belongs to the technical field of microelectronics, and relates to a voltage compensation method and system, in particular to an AMOLED voltage external compensation method and system. Background technique [0002] AMOLED (Active Matrix / Organic Light Emitting Diode, Active Matrix Organic Light Emitting Diode panel) uses active drive, which has a drive tube TFT, due to the deviation of the TFT process, the threshold voltage and electron mobility of each drive tube It is impossible to keep the parameters completely consistent. The difference in the threshold voltage of the drive tube and the electron mobility will have a bad influence on the quality of the displayed image. Therefore, the threshold voltage and electron mobility of the drive tube need to be compensated. [0003] The traditional compensation method is to compensate the threshold voltage and electron mobility of the drive tube inside the pixel. There are many compensation str...

Claims

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Application Information

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IPC IPC(8): G09G3/32G09G3/3258
Inventor 黄成强汪宁章琦妙维汪辉封松林
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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