OLED Lens Array Color Shift Mitigation via CIE Coordinate Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices using organic light emitting diodes (OLEDs) face issues with color-shift phenomena due to light passing through lens array structures, which can lead to distortion of image information.
Innovation Solution
A display device configuration that includes a light-emitting-element layer with an anode and cathode electrode, and sub-pixels with specific emission structures, paired with a lens-array layer where each lens overlaps a corresponding sub-pixel. This configuration defines light output in specific color coordinates to enhance light output efficiency and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a lens array structure is used to guide light output, then light output efficiency is improved, but color-shift phenomenon occurs causing image distortion
Solution Approach 1:
The patent applies local quality by configuring different sub-pixels (red, green, blue) with specific emission structures and pairing them with corresponding lenses in the lens array layer. Each sub-pixel-lens combination is locally optimized to emit light within specific CIE color coordinate ranges, ensuring that each local region contributes to accurate overall color reproduction while maintaining high light output efficiency
Solution Approach 2:
The patent utilizes parameter changes by precisely controlling the CIE color coordinates of light emitted from each sub-pixel. The red sub-pixel emits light with x-coordinate 0.670-0.685, green sub-pixel emits light with x-coordinate 0.230-0.265, and blue sub-pixel emits light with x-coordinate 0.040-0.060. By adjusting and maintaining these specific parameter ranges, the patent achieves accurate color reproduction while using the lens array for efficient light guidance
2Manufacturing precision
If color coordinates are precisely controlled to improve color quality, then light output efficiency may be reduced
Solution Approach 1:
The patent applies preliminary action by pre-configuring the emission structures of sub-pixels to emit light within specific CIE color coordinate ranges before the light passes through the lens array. The red, green, and blue sub-pixels are designed to emit light with predetermined color coordinates, so that when the light passes through the lens array for efficient guidance, the color quality is already optimized and maintained
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 proposed solution achieves excellent color quality, enhanced light output efficiency, and improved reliability of light output information by precisely defining color coordinates, thereby minimizing image distortion caused by color-shift phenomena.
Implementation Method 1
Organic light emitting diodes (OLEDs) are active emission display elements... The OLEDs have advantages of being lightweight and thin, and having fast response time characteristics
Implementation Method 2
When light passes through the lens array structure, a color-shift phenomenon may occur
Data Source
AI summary
A display device may include: a light-emitting-element layer disposed on a substrate, and including an anode electrode, a cathode electrode, a first sub-pixel including a first emission structure, a second sub-pixel including a second emission structure, and a third sub-pixel including a third emission structure; and a lens-array layer on the light-emitting-element layer, and including lenses including first, second, and third lenses provided to respectively overlap the first, second, and third emission structures. In the first sub-pixel, first base light provided from the first emission structure may pass through the first lens and be provided as first light. In the second sub-pixel, second base light provided from the second emission structure may pass through the second lens and be provided as second light. In the third sub-pixel, third base light provided from the third emission structure may pass through the third lens and be provided as third light.