Display Panel Light Diffusion Layer for Viewing Angle Contrast
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Solution Overview
Problem
LED display panels experience variations in contrast and color tone due to differences in light distribution characteristics among RGB light-emitting elements, affecting display quality when viewed from different angles.
Innovation Solution
A display panel design featuring a mounting substrate with light-emitting elements of different luminescence wavelengths, paired with a counter substrate that includes a light-shielding layer and a light diffusion layer. The light diffusion layer is positioned to block apertures in the light-shielding layer, forming a gap with the light-emitting elements, which reduces variations in contrast and color tone across viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional LED display panel is used without a light diffusion layer, then the structure is simple and manufacturing is easy, but the display quality deteriorates due to variations in contrast and color tone depending on viewing angle
Solution Approach 1:
A light diffusion layer is introduced as an intermediary component between the light-emitting elements and the viewing environment. This layer mediates the light distribution characteristics by diffusing the light from RGB LEDs, thereby reducing viewing angle dependence and improving display quality without fundamentally changing the LED structure itself
Solution Approach 2:
The light diffusion layer is selectively positioned only in regions where light-emitting elements are located, rather than uniformly across the entire display panel. This localized approach addresses the specific problem of light distribution while maintaining structural simplicity in non-emissive areas
2Adaptability or versatility
If light-emitting elements with different luminescence wavelengths (RGB LEDs) are used for each pixel, then display color capability is improved, but variations in light distribution characteristics among different wavelengths cause contrast and color tone variations depending on viewing angle
Solution Approach 1:
The light diffusion layer changes the optical parameters of the emitted light by introducing diffusion. This modifies the light distribution characteristics across different wavelengths, reducing the viewing angle dependence that otherwise varies among RGB LEDs with different luminescence wavelengths
3Manufacturing precision
If the light diffusion layer is positioned close to the light-emitting elements, then the gap is small and the structure is compact, but the light diffusion effect may be insufficient; if positioned far, then diffusion effect is better but the device becomes larger
Solution Approach 1:
The gap distance between the light diffusion layer and light-emitting elements is optimized as a critical parameter. By carefully controlling this distance, sufficient light diffusion effect is achieved while maintaining a compact overall structure, balancing optical performance with device size constraints
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 configuration enhances display quality by minimizing contrast and color tone variations when viewed from different angles, thereby reducing the deterioration caused by light distribution differences among the light-emitting elements.
Implementation Method 1
a light diffusion layer, the light diffusion layer blocking up the apertures
Data Source
AI summary
A display panel includes: a mounting substrate including light-emitting elements that are mounted for each pixel on a wiring substrate, in which the light-emitting elements have different luminescence wavelengths from each other; and a counter substrate provided in opposition to a surface, of the mounting substrate, on which the pixels are disposed, and including a light-shielding layer and a light diffusion layer. The light-shielding layer is provided on a surface, of a light transmissive substrate, that faces the pixels and has apertures at respective positions that face the light-emitting elements. The light diffusion layer blocks up the apertures, is provided on a surface, of the light-shielding layer, that faces the pixels, is at least in contact with end edges of the respective apertures, and forms a gap together with the light-emitting elements between the light diffusion layer and the light-emitting elements.