Foldable Display Luminance Compensation Using Optical Feedback
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Solution Overview
Problem
Flexible display panels in foldable display devices suffer from deterioration over time, affecting display quality, which existing technologies have difficulty in effectively compensating for.
Innovation Solution
A foldable display device with a flexible display panel, an optical module, and a deterioration compensator that senses display luminance and applies luminance compensation values only when necessary to maintain target luminance, using a lookup table to calculate compensation based on stress values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous deterioration compensation is performed, then display quality is maintained, but energy is wasted when luminance is already sufficient
Solution Approach 1:
The system continuously monitors display luminance through the optical module and uses this feedback to dynamically control whether compensation operations are performed. The deterioration compensator compares sensed luminance values against reference values and adjusts compensation operations accordingly, enabling the system to maintain display quality while avoiding unnecessary energy consumption when compensation is not needed.
Solution Approach 2:
The compensation operation transitions from a static continuous process to a dynamic conditional process. The system adaptively adjusts the compensation state based on real-time luminance measurements and folding angle conditions, switching between compensation and non-compensation modes to optimize energy efficiency while maintaining display quality when needed.
2Reliability
If luminance compensation is always applied, then display quality is maintained, but display uniformity deteriorates due to over-compensation
Solution Approach 1:
The system uses real-time luminance feedback to determine whether compensation is actually needed. By comparing sensed luminance against reference values and considering folding angle conditions, the system applies compensation only when luminance deterioration is detected, preventing over-compensation that would cause display uniformity issues while maintaining quality when deterioration occurs.
Solution Approach 2:
The system dynamically changes the compensation parameter (luminance compensation value) based on folding angle and sensed luminance conditions. When the folding angle exceeds the reference angle or luminance is sufficient, compensation is reduced or stopped, preventing display uniformity deterioration. When conditions warrant compensation, the parameter is adjusted to maintain display quality.
3Reliability
If deterioration compensation operations are frequently performed, then display quality is maintained, but response time increases due to processing overhead
Solution Approach 1:
The system performs luminance sensing and compensation operations periodically based on folding angle changes rather than continuously. The optical module senses luminance at specific intervals determined by folding angle thresholds, and compensation is triggered only when angle changes exceed the reference angle. This periodic approach maintains display quality while significantly reducing processing overhead and improving response time compared to continuous operations.
4Measurement precision
If the optical module senses the entire display area, then measurement precision is high, but device complexity increases
Solution Approach 1:
The optical module is positioned to sense luminance from a specific local region of the display panel rather than the entire display area. The deterioration compensator uses luminance measurements from this localized sensing area to determine compensation needs for the entire display. This approach achieves sufficient measurement precision for compensation control while keeping the optical module size and system complexity manageable.
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
The solution selectively compensates for display luminance deterioration, improving display quality by applying compensation only when needed, thus enhancing the overall performance of the foldable display device.
Implementation Method 1
an optical module disposed in the first display area configured to sense a display luminance of the test image
Data Source
AI summary
A foldable display device is disclosed that includes a flexible display panel, an optical module, and a deterioration compensator. The flexible display panel includes a folding line, a first display area disposed on a first side of the folding line, and a second display area disposed on a second side of the folding line to display a test image. The optical module is disposed in the first display area and is configured to sense a display luminance of the test image. The deterioration compensator is configured to perform a deterioration compensating operation of the display luminance by a luminance compensation value when the display luminance is less than a target luminance, without performing the deterioration compensating operation when the display luminance is greater than the target luminance.