OLED Display Luminance Switching for Burn-In Prevention
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Solution Overview
Problem
Light emitting display apparatuses used in multiple devices face challenges in effectively applying deterioration prevention functions when transitioning between uses, such as from television to monitor, leading to issues like reduced luminance that cannot be restored.
Innovation Solution
A control driver in the display apparatus analyzes input image data to activate or deactivate deterioration prevention functions like Temporal Peak Luminance Control (TPC) and Logo Extraction Algorithm (LEA), adjusting luminance levels based on image content to minimize device degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a deterioration prevention function is activated in a light emitting display apparatus made for television, then the luminance is reduced to prevent deterioration, but the luminance cannot be changed back to normal when the apparatus is used as a monitor
Solution Approach 1:
The system dynamically adjusts luminance based on real-time detection of moving objects in the display area. When a moving object is detected, the deterioration prevention function is deactivated and normal luminance is restored. When no moving objects are detected for a predetermined time, the function is reactivated. This dynamic switching resolves the contradiction by making the luminance adaptation flexible rather than fixed.
Solution Approach 2:
The system uses a detector to continuously monitor the display area for moving objects and provides feedback to the control driver. Based on this feedback, the control driver automatically switches between deterioration prevention mode and normal display mode. This feedback mechanism enables the system to adapt to different usage scenarios automatically, resolving the contradiction between deterioration prevention and usage flexibility.
2Duration of action of stationary object
If the luminance is continuously reduced to prevent light emitting device deterioration, then the device lifespan is extended, but the display performance and user experience are degraded
Solution Approach 1:
The system periodically evaluates whether to activate or deactivate the deterioration prevention function based on the presence of moving objects. Instead of maintaining continuously reduced luminance, the system alternates between low luminance (when no moving objects detected) and normal luminance (when moving objects detected), thus extending device lifespan while maintaining acceptable display performance during active usage.
Solution Approach 2:
The system changes the luminance parameter dynamically based on detected usage patterns. When a moving object is detected, the luminance parameter is increased to normal levels for optimal display performance. When no moving objects are detected for a predetermined time, the luminance parameter is reduced to prevent deterioration. This parameter change strategy resolves the contradiction between lifespan extension and performance maintenance.
3Adaptability or versatility
If a scaler is added to analyze input image data and control deterioration prevention function activation, then the adaptability to different usage scenarios is improved, but the device complexity increases
Solution Approach 1:
The scaler acts as an intermediary component that analyzes input image data and communicates usage pattern information to the control driver. Rather than making the control driver directly complex, the scaler mediates between the input signal source and the control logic, enabling adaptive deterioration prevention while maintaining a relatively simple overall system structure.
Data Source
AI summary
A light emitting display apparatus can include a control driver configured to perform a deterioration prevention function, a scaler configured to transmit a deterioration prevention function activation request signal to the control driver and transmit a deterioration prevention function deactivation request signal to the control driver based on an analysis result of input image data when deterioration prevention function start information is received from the control driver, and a light emitting display panel configured to display images under control of the control driver. The amount of change in an image used in the scaler is smaller than the amount of change in an image used in the control driver.