A method and system for adaptive brightness compensation of oled devices based on temperature feedback

A technology of brightness compensation and temperature feedback, applied in instruments, static indicators, etc., can solve problems such as changes, and achieve the effect of fast response

Active Publication Date: 2021-10-26
NANJING GUOZHAO OPTOELECTRONICS TECH CO LTD
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Problems solved by technology

[0003] Technical purpose: to directly adjust the cathode voltage V when adjusting the brightness of the OLED microdisplay in the prior art COM Defects that lead to changes in GAMMA characteristics. The present invention discloses a method and system for adaptive brightness compensation of OLED devices based on temperature feedback. The system includes a set of off-chip parameter calculation models and a set of on-chip temperature feedback brightness compensation models. Through In the temperature feedback brightness compensation model, the temperature detection unit detects the temperature of the OLED device and controls the cathode voltage V COM Feedback adjustment is performed, and at the same time feedback updates the look-up table of each binding point value of the GAMMA calibration curve, so that the display can maintain the consistency of brightness and GAMMA characteristics in a wide temperature range

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  • A method and system for adaptive brightness compensation of oled devices based on temperature feedback

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Embodiment

[0065] In this embodiment, the low temperature is -25°C, the normal temperature is 25°C, and the high temperature is 70°C.

[0066] S1. Establish an off-chip parameter calculation model. The parameter calculation model is used to realize: based on the measured results of OLED device current-anode and cathode voltage (I-V) characteristics and brightness characteristics at different temperatures, the cathode voltage at room temperature 25°C V COM Input the values ​​of each binding point of the GAMMA calibration curve, and calculate the corresponding cathode voltage V corresponding to the brightness of the OLED device at room temperature 25 °C at a low temperature of -25 °C and at a high temperature of 70 °C and keeping the GAMMA characteristics unchanged at room temperature 25 °C COM Binding point values ​​with the GAMMA calibration curve; output the cathode voltage V corresponding to the same brightness of the OLED device at the low temperature of -25°C, normal temperature of 2...

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Abstract

The invention discloses a method and system for adaptive brightness compensation of OLED devices based on temperature feedback. The method includes establishing an off-chip parameter calculation model; establishing an internal temperature feedback brightness compensation model; and updating the cathode voltage V of the OLED device in real time. COM and each binding point value of the GAMMA calibration curve. The present invention uses two sets of models in conjunction to self-adaptively adjust the OLED cathode voltage V according to ambient temperature changes. COM , so that the OLED device can maintain the consistency of brightness in a wide temperature range; at the same time, it controls the GAMMA calibration curve of the OLED device to update the value lookup table of each binding point in real time according to the change of the ambient temperature, so as to ensure the GAMMA characteristics of the OLED device. Consistency over temperature.

Description

technical field [0001] The invention relates to the field of microelectronics and display technology, in particular to a method and system for adaptive brightness compensation of OLED devices based on temperature feedback. Background technique [0002] Microdisplay is a branch of the field of display technology, which realizes the combination of display technology and silicon-based integrated circuit technology. According to different light-emitting principles, the existing microdisplays mainly include: digital micromirror device (Digital Mirror Device, DMD), LCD microdisplay, liquid crystal on silicon (Liquid Crystal on Silicon, LCoS) microdisplay, silicon-based organic light-emitting diode (Organic Light Emitting Diode on Silicon, OLED-on-Silicon) microdisplays, Micro-LED microdisplays, etc., in which OLED devices are active light emitting devices, and the luminous brightness is proportional to the magnitude of the driving current. However, the I-V characteristics of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/3208
CPCG09G3/3208G09G2320/0233G09G2320/041
Inventor 徐亭亭秦昌兵张白雪陈啓宏朱会成杨建兵
Owner NANJING GUOZHAO OPTOELECTRONICS TECH CO LTD
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