OLED Mirroring Image Brightness Control via APL Thresholds
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Solution Overview
Problem
OLED display devices experience an afterimage phenomenon due to varying lifespans of elements caused by the display of mirroring screens, particularly in regions emitting higher brightness, leading to reduced brightness and user inconvenience.
Innovation Solution
An OLED display device with a controller that receives mirroring image data, calculates the average picture level (APL) variation, and controls the display to either maintain or hide the mirroring image based on APL thresholds, adjusting transparency and size to prevent excessive wear on specific elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the OLED display device continuously displays a mirroring image in a specific region, then the screen mirroring function is effectively provided, but the lifespan of OLED elements in high-brightness regions is rapidly reduced causing afterimage phenomenon
Solution Approach 1:
The controller periodically changes the display state of the mirroring image between display and non-display states. This periodic switching prevents continuous high-brightness emission in the same region, thereby reducing cumulative wear on specific OLED elements while still providing the screen mirroring function over time
Solution Approach 2:
The display state of the mirroring image is dynamically adjusted based on detected image types (still image vs. moving image). When a still image is detected, the system switches to non-display state to prevent element degradation, while allowing display state for moving images, creating a dynamic adaptation to content characteristics
2Ease of operation
If the mirroring image is continuously displayed to maintain functionality, then user convenience is preserved, but brightness difference between regions increases causing afterimage
Solution Approach 1:
The controller extracts and identifies still image regions within the mirroring image content. By detecting regions with minimal or no image changes over time, the system selectively applies non-display state to these static regions while maintaining display for dynamic regions, thereby preserving overall functionality while preventing localized brightness degradation
Solution Approach 2:
The display control is applied locally to specific regions rather than uniformly across the entire display. The controller identifies high-brightness static regions and applies non-display state specifically to those areas, while other regions continue normal display operations, creating different display qualities in different spatial locations based on their usage characteristics
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
Prevents the afterimage phenomenon by ensuring OLED elements in high-brightness regions have similar lifespan reduction to others, maintaining image quality and extending device reliability.
Implementation Method 1
The OLED is a self-luminous organic material that emits light by itself by using an electroluminescence phenomenon that light is emitted when a current flows through a fluorescent organic compound
Data Source
AI summary
An organic light emitting diode (OLED) display device includes a communication transceiver configured to connect with a terminal; a display including pixels constituted by OLEDs; and a controller configured to receive mirroring image data, which corresponds to a screen displayed on the terminal, through the communication transceiver, control the display to display a mirroring image on an area of the display based on the received mirroring image data, and adjust brightness of the displayed mirroring image based on an average picture level (APL) of the displayed mirroring image.