Blue Sub-Pixel Segmentation for EL Display Lifetime
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Solution Overview
Problem
Electroluminescence (EL) display panels have a short lifetime due to the shorter lifespan of blue sub-pixels, which affects the overall display panel's performance and color reproduction, as blue organic compounds degrade faster than red and green ones.
Innovation Solution
The implementation of at least two blue sub-sub-pixels that are operated alternately among frames to extend the lifetime of the blue sub-pixel, with a specific pixel configuration that includes a red sub-pixel, a green sub-pixel, and multiple blue sub-sub-pixels arranged to maintain high image resolution and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a low electrical current is applied to blue sub-pixel, then the lifetime of blue sub-pixel is extended, but the color reproduction becomes weaker and color requirement for full color display cannot be satisfied
Solution Approach 1:
The blue sub-pixel is divided into multiple blue sub-sub-pixels (first blue sub-sub-pixel, second blue sub-sub-pixel, etc.). Each sub-sub-pixel can be independently driven, allowing the system to distribute the driving current across multiple segments. This segmentation enables maintaining lower current per segment (extending lifetime) while combining their light output to achieve sufficient overall color reproduction.
Solution Approach 2:
The blue sub-sub-pixels are driven alternately in a periodic manner across different frames. In odd frames, the first blue sub-sub-pixel is driven while the second is off, and in even frames, the second is driven while the first is off. This periodic activation allows each sub-sub-pixel to rest and recover, extending overall lifetime while maintaining continuous blue color output through temporal multiplexing.
2Illumination intensity
If the area of blue sub-pixel is enlarged to satisfy color requirement, then the color reproduction is improved, but the lifetime is still reduced due to increased heating
Solution Approach 1:
Instead of enlarging a single blue sub-pixel area, the invention segments the blue sub-pixel into multiple smaller blue sub-sub-pixels. This allows the total blue area to be distributed across multiple independent units, each operating at lower current and generating less heat, thereby extending lifetime while maintaining sufficient overall color output through combined emission.
Solution Approach 2:
By alternately driving different blue sub-sub-pixels in periodic frames, the invention allows each sub-sub-pixel to have rest periods during which it can cool down and recover. This periodic operation prevents continuous heating that would occur with a single enlarged blue sub-pixel, thereby extending lifetime while maintaining color reproduction quality.
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 extends the lifetime of the blue sub-pixel by at least two times, maintaining full color display quality and improving image resolution without compromising on color reproduction, even when using lower electrical currents.
Implementation Method 1
electroluminescence (EL) display device displays by using light generated through electrically exciting organic compounds
Data Source
AI summary
The present invention relates to an electroluminescence display panel and a method of driving the same. The electroluminescence display panel comprises a plurality of pixels arranged in a matrix, each of the pixels including a red sub-pixel, a green sub-pixel and a blue sub-pixel. The blue sub-pixel includes at least a first blue sub-sub-pixel and a second blue sub-sub-pixel. In operation, the first blue sub-sub-pixel and the second blue sub-sub-pixel are alternately driven among frames.