Compensating Uneven OLED Aging in Foldable Displays
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Solution Overview
Problem
Foldable electronic devices with OLED displays face inconsistent aging due to uneven usage patterns, leading to variations in display quality across different areas, especially with blue subpixels aging faster, which worsens when the device is folded, causing uneven luminance and color issues.
Innovation Solution
An electronic device method that determines actual values of display parameters by statistical analysis and adjusts working currents or prolongs usage duration to set compensation target values, ensuring consistent display effects across different displays by writing these values into control registers, thereby reducing differences in aging and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If OLED displays are used to provide high luminance and wide viewing angle, then display quality is improved, but uneven aging occurs due to inconsistent usage duration across different display areas
Solution Approach 1:
The patent applies local quality by dividing the display into different usage areas (first usage area with longer duration, second usage area with shorter duration) and applying different compensation strategies to each area. The compensation module writes different compensation values into different display regions based on their specific aging characteristics, ensuring each area is compensated according to its actual aging degree rather than applying a uniform compensation across the entire display.
Solution Approach 2:
The patent changes parameters by dynamically adjusting compensation values based on usage statistics. The system collects usage duration data, determines actual aging degrees for different areas, and calculates compensation values that modify display parameters (such as luminance output) to counteract the uneven aging effects. This parameter adjustment is continuously adapted based on monitored usage patterns.
2Adaptability or versatility
If foldable display configuration is used to enhance portability, then device adaptability is improved, but usage duration difference between displays increases causing inconsistent display effects
Solution Approach 1:
The patent segments the display system into multiple independent usage areas with distinct compensation modules. Each display area (first display area and second display area) has its own compensation value stored in separate memory locations. The system separately collects usage statistics for each area and applies independent compensation, allowing each segment to be optimized for its specific usage pattern while maintaining overall display consistency.
Solution Approach 2:
The patent implements feedback by continuously collecting usage duration statistics from different display areas and using this information to dynamically adjust compensation values. The system monitors actual usage patterns, compares them against compensation criteria, and automatically modifies compensation parameters to maintain consistent display effects across all areas despite different usage durations caused by the foldable configuration.
3Quantity of substance
If blue subpixel materials are used to achieve RGB full-color display, then color completeness is improved, but aging speed increases due to shorter attenuation period
Solution Approach 1:
The patent changes parameters by determining compensation values specifically tailored to counteract the faster aging of blue subpixels. The system monitors usage statistics for areas with blue subpixel content and calculates compensation values that adjust the display parameters (such as reducing luminance or adjusting color balance) to extend the effective lifetime of blue subpixels and match the aging rates of red and green subpixels.
Data Source
AI summary
A compensation method includes that an electronic device determines, based on statistical data of a first display and a first correspondence, a first actual value of a to-be-measured parameter of the first display at the end of a first statistical period; determines, based on statistical data of a second display and a second correspondence, a second actual value of a to-be-measured parameter of the second display at the end of the first statistical period; determines a compensation target value based on the first actual value and the second actual value when the first actual value is less than the second actual value; and writes the compensation target value into a first register configured to control the to-be-measured parameter of the first display, and writes the compensation target value into a second register configured to control the to-be-measured parameter of the second display.