OLED Panel Brightness Control During Booting
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Solution Overview
Problem
High brightness during the booting process of organic light-emitting diode (OLED) panels can lead to excessive current and voltage offset, causing image sticking and accelerated aging of the device.
Innovation Solution
A method to control the brightness of OLED panels by comparing the displayed brightness of each pixel with a preset threshold, adjusting it if necessary, and using the adjusted brightness to control the display, while gradually increasing the threshold over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If brightness of the picture during booting is increased to improve display quality, then display quality is improved, but temperature of the panel increases causing OLED device to age too fast or burn
Solution Approach 1:
The patent applies preliminary action by detecting the booting state before normal operation and proactively limiting brightness during this critical period. The brightness limiting module activates before the OLED device reaches dangerous temperature levels, preventing thermal accumulation that would cause aging or burning. This pre-emptive measure resolves the contradiction by controlling brightness during the vulnerable booting phase.
2Illumination intensity
If brightness of the picture during booting is increased to improve display quality, then display quality is improved, but voltage offset of TFT increases causing image sticking
Solution Approach 1:
The system performs preliminary detection of the booting state and applies brightness limiting before high brightness can cause voltage offset accumulation in TFT devices. By controlling brightness during the booting process, the patent prevents the voltage offset that would lead to image sticking, thus maintaining image quality stability while still allowing normal brightness operation after booting completes.
3Illumination intensity
If current is increased to improve brightness, then brightness is improved, but heat dissipation increases causing OLED device to age too fast or burn
Solution Approach 1:
The patent applies preliminary action by detecting the booting state and proactively limiting brightness current before excessive heat dissipation can occur. The brightness limiting module controls the current supplied to OLED devices during the booting phase, preventing thermal accumulation that would cause accelerated aging or burning. After booting completes, normal current levels can be restored for optimal brightness performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the probability of image sticking and slows down the aging of the panel by maintaining a safe brightness level during booting, thereby preventing excessive current and voltage offset.
Implementation Method 1
active-matrix organic light-emitting diode (AMOLED)
Data Source
AI summary
A method for controlling brightness of an OLED panel when booting. The method includes steps of: obtaining a brightness to be displayed corresponding to each pixel in a booting process; comparing the brightness to be displayed of each pixel with a preset brightness threshold; if the brightness to be displayed is greater than the brightness threshold, adjusting the brightness to be displayed to be less than or equal to the brightness threshold; using the brightness to be displayed after adjusting to adjust a grayscale value to be displayed of the pixel; using the grayscale value to be displayed to control a corresponding pixel to perform a display; gradually increasing the brightness threshold with time, and returning to the step of obtaining a brightness to be displayed corresponding to each pixel in a booting process. The present invention can reduce the probability of the image sticking and the speed of ageing.