OLED Display Compensation for Brightness Uniformity and Power
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Solution Overview
Problem
In organic light emitting display (OLED) panels, the variability in electrical characteristics of driving thin film transistors due to manufacturing limitations and environmental factors leads to uneven display brightness and reduced product lifespan.
Innovation Solution
A display image compensation method that determines if an image is still or dynamic, preprocesses still images by reducing brightness based on frame count, and detects threshold voltage and mobility parameters to compensate for variations, thereby improving brightness uniformity and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If full brightness is maintained for still images, then display quality is preserved, but power consumption increases
Solution Approach 1:
The patent implements dynamic brightness adjustment by detecting whether the display image is a still image and automatically reducing brightness for still images while maintaining normal brightness for dynamic images. This dynamic adaptation resolves the contradiction between maintaining display quality and reducing power consumption.
Solution Approach 2:
The patent changes the brightness parameter based on image type detection. For still images, the brightness parameter is reduced to a lower level, while for dynamic images, the brightness parameter remains at normal levels. This parameter change strategy effectively balances display quality and power consumption.
2Illumination intensity
If threshold voltage and mobility parameters are detected and compensated, then brightness uniformity is improved, but device complexity increases
Solution Approach 1:
The patent performs preliminary detection of threshold voltage and mobility parameters before displaying images. By pre-detecting these parameters and preparing compensation data in advance, the system improves brightness uniformity without adding significant operational complexity during actual display.
Solution Approach 2:
The patent implements a feedback mechanism where detected threshold voltage and mobility parameters are used to generate compensation data that is fed back to the display system. This feedback loop automatically corrects brightness non-uniformity without requiring complex manual intervention.
3Measurement precision
If frame rate is reduced for detection, then detection accuracy is improved, but display smoothness deteriorates
Solution Approach 1:
The patent segments the display process into distinct phases: a detection phase where frame rate is temporarily reduced to accurately measure threshold voltage and mobility parameters, and a normal display phase where full frame rate is restored. This temporal segmentation allows high-precision detection without permanently sacrificing display smoothness.
Data Source
AI summary
A compensation method disclosed in this application comprises following steps of: obtaining a display image and determining whether the display image is a still image; if the display image is a still image, preprocessing the still image to reduce power consumption of the display image, thereby obtaining a target display image after preprocessing; detecting the target display image to obtain a threshold voltage data and a mobility parameter; and compensating the display image according to the threshold voltage data and the mobility parameter.