Brightness compensation method and system for oled microdisplay based on temperature feedback

A technology of micro-display and temperature feedback, applied in static indicators, instruments, etc., can solve the problems of affecting display effect, OLED luminance fluctuation, OLED luminescence change, etc.

Active Publication Date: 2021-10-15
NANJING GUOZHAO OPTOELECTRONICS TECH CO LTD
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Problems solved by technology

However, the I-V characteristics of OLED devices will change with the change of ambient temperature, resulting in the fluctuation of OLED luminance with ambient temperature under constant voltage drive mode.
In order to keep the brightness consistency of the microdisplay in a wide temperature range, it can be directly changed by changing its cathode voltage (V COM ) to change the OLED device current, thereby adjusting the brightness of the display, but changing V COM The size of the voltage will lead to changes in the gamma (GAMMA) characteristics of OLED light, which will affect the display effect

Method used

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  • Brightness compensation method and system for oled microdisplay based on temperature feedback
  • Brightness compensation method and system for oled microdisplay based on temperature feedback
  • Brightness compensation method and system for oled microdisplay based on temperature feedback

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with the accompanying drawings.

[0045]The invention discloses a brightness compensation method for OLED micro-displays based on temperature feedback. According to temperature changes, the light-emitting time of OLED devices is adaptively modulated, so that the micro-display can maintain the consistency of brightness in a wide temperature range, such as figure 1 shown, including the following steps:

[0046] Step S1, preset the normal temperature, the temperature feedback module determines the required brightness of the micro-display at normal temperature and the corresponding luminous time, and quantifies the luminous time into the luminous series, that is, V COM Pulse width, calculate the temperature and V of the OLED device COM The luminescence time modulation function of the pulse width is fitted by a piecewise linear fit, and the piecewise linear fitting function of the luminescence time modulat...

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Abstract

The invention discloses a brightness compensation method and system for an OLED microdisplay based on temperature feedback, comprising: a temperature detection module detects and reads out the temperature of a microdisplay drive chip in real time; The function gets the corresponding V of the microdisplay at this temperature COM Pulse width; luminous time modulation module adaptively modulates V COM The voltage switching waveform changes the light-emitting time of the OLED device in one frame, thereby achieving the effect of brightness adjustment, so that the micro-display can maintain the consistency of brightness in a wide temperature range. The invention can realize N-level brightness modulation, and the method of changing the brightness of the micro-display by controlling the light-emitting time of the OLED device does not affect its gamma characteristics; Fluctuation does not flicker.

Description

technical field [0001] The invention belongs to the field of microelectronics and display technology, and in particular relates to a brightness compensation method and system for an OLED microdisplay 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), silicon-based liquid crystal (Liquid Crystal on Silicon, LCoS) microdisplay, silicon-based organic light emitting diode (Organic Light Emitting Diode on Silicon, OLED-on-Silicon) microdisplay, Micro-LED microdisplay, etc. The OLED device is an active light-emitting device, and the luminous brightness is proportional to the driving current. However, the I-V characteristics of the OLED device will change with th...

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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