OLED Display Selective Illumination for Uniform Degradation
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Solution Overview
Problem
OLED display devices face challenges due to uneven degradation of organic materials, particularly blue light, which affects image quality and lifespan, especially in devices expected to have extended use.
Innovation Solution
A system that senses user presence and adjusts pixel illumination based on the field of view, reducing blue light intensity for pixels outside the field of view to promote uniform degradation of OLED films, thereby extending display lifespan and maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If blue OLED material is used to generate light, then the display can produce full-color images, but the blue material deteriorates at twice the rate of red and green materials
Solution Approach 1:
The patent applies local quality by differentiating treatment between pixels in the user's field of view and those outside it. Pixels outside the field of view receive adjusted drive signals that reduce blue channel illumination intensity, while pixels within the field of view maintain normal color output. This localized adjustment protects blue OLED material in non-viewed areas without compromising the overall display quality.
Solution Approach 2:
The patent implements dynamics by continuously monitoring user position via camera and dynamically adjusting pixel drive signals in real-time. As the user moves or changes viewing angle, the system recalculates which pixels are within the field of view and adjusts blue channel intensity accordingly. This dynamic adaptation ensures optimal protection of blue OLED material while maintaining image quality throughout the display session.
2Stability of the object's composition
If prolonged illumination of a color is applied to generate images, then the display can maintain consistent color output, but the OLED material in that area degrades at a different rate than other areas
Solution Approach 1:
The patent applies local quality by implementing different illumination strategies for pixels within versus outside the user's field of view. Pixels outside the field of view receive reduced blue channel intensity to prevent excessive degradation from prolonged illumination, while pixels within the field of view maintain full color output for quality viewing experience.
Solution Approach 2:
The patent implements feedback by continuously monitoring user position through camera input and using this information to adjust pixel drive signals. The system calculates which pixels fall within the user's field of view and dynamically modifies blue channel intensity for pixels outside this region, creating a closed-loop system that adapts to changing viewing conditions and prevents uneven degradation.
3Duration of action of stationary object
If blue OLED material illumination is reduced to extend lifespan, then material degradation is slowed, but the display may lack full color accuracy
Solution Approach 1:
The patent applies local quality by selectively adjusting blue channel intensity only for pixels outside the user's field of view, while maintaining full blue illumination for pixels within the field of view. This ensures that color accuracy is preserved in the visible area where the user actually views the display, while extending the lifespan of the blue OLED material in non-viewed areas through reduced illumination.
Solution Approach 2:
The patent implements dynamics by continuously adapting pixel drive signals based on real-time user position data from the camera. As the user moves or changes viewing angle, the system dynamically recalculates which pixels should receive full blue illumination versus reduced blue illumination, ensuring that color accuracy is maintained in the currently viewed area while protecting material in non-viewed areas.
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
This approach ensures uniform OLED film degradation, minimizing the impact on user experience while extending the display's lifespan by adjusting pixel values to account for differential material degradation, particularly reducing blue light exposure where it's not directly viewed.
Implementation Method 1
OLED devices generate images with pixels much like CRT and LCD devices but instead excite an emissive electroluminescent layer of an organic compound film to emit light in response to an electric current
Data Source
AI summary
A display presents information as visual images with plural pixels, each pixel having red, green and blue OLED films that illuminate with varying intensity defined by pixel values generated by a graphics processor. An image adjuster alters the pixel values for pixels located outside the field of view of an end user so that degradation of OLED material occurs in a balanced manner, such as by reducing illumination of blue OLED material, which tends to degrade at a more rapid rate than red and green OLED material.