Light Path Control Member for Micro-Cavity Display Color Shift
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Solution Overview
Problem
Light emitting display apparatuses with micro-cavity structures experience significant color shift as the viewing angle increases, leading to degradation in image quality, particularly exhibiting a bluish phenomenon when displaying white images from the side.
Innovation Solution
A light path control member comprising a layered structure with a transparent base member and multiple refractive surfaces, where the third light control layer has a lower refractive index than the second, and the first and second refractive surfaces are inclined at specific angles to control the path of incident light, minimizing color shift by refracting light in the vertical direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a micro-cavity structure including a reflector and a semi-transmissive reflector is applied to improve output luminance, then the luminance of the self-emitting device is improved, but color shift occurs as the viewing angle increases from front to side
Solution Approach 1:
The light control layer is divided into multiple layers (first, second, and third light control layers) with different refractive indices. Each layer segments the light control function, with the first layer having higher refractive index for strong light bending at large angles, the second layer providing intermediate control, and the third layer with lower refractive index for minimal interference at small angles, collectively resolving the color shift problem across different viewing angles
Solution Approach 2:
Different regions of the light control layer are assigned different refractive indices to optimize performance for different viewing conditions. The first light control layer with higher refractive index is positioned to handle large-angle viewing, while the third light control layer with lower refractive index handles small-angle viewing, creating local optimization throughout the structure
2Adaptability or versatility
If the viewing angle increases from front surface to side surface, then the observation coverage is improved, but color shift occurs and white is recognized as bluish due to blue shift
Solution Approach 1:
The light control structure dynamically adapts to different viewing angles through its multi-layer refractive index configuration. At small viewing angles, light passes through with minimal refraction maintaining color accuracy, while at large viewing angles, the higher refractive index layers actively bend light paths to compensate for the micro-cavity's blue shift tendency, providing dynamic color correction across the viewing cone
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 solution effectively reduces color shift and bluish phenomena across various viewing angles, maintaining image quality and color accuracy, especially in side viewing conditions.
Implementation Method 1
the third light control layer has a refractive index which is lower than a refractive index of the second light control layer, and the light path control layer includes a first refractive surface between the first light control layer and the third light control layer and a second refractive surface and a third refractive surface between the second light control layer and the third light control layer
Data Source
AI summary
A light path control device and an electronic device including the light path control device, which reduce color shift at a side viewing angle, are provided. The light path control device can include a light path control layer including first, second and third light control layers, and a transparent base member coupled to the first light control layer or the third light control layer. The third light control layer can have a refractive index which is lower than a refractive index of the second light control layer. The light path control layer can include a first refractive surface disposed between the first light control layer and the third light control layer, and a second refractive surface and a third refractive surface disposed between the second light control layer and the third light control layer.