Display Device Transparent Layer Refractive Index Light Shielding
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Solution Overview
Problem
Display devices face issues with luminance degradation due to light absorption by the light-shielding layer, leading to reduced light use efficiency and display quality, especially as distance from the light-emitting element increases, and undesired scattering of external light.
Innovation Solution
A display device configuration featuring a light-shielding layer with reduced refractive index compared to the transparent substrates, a transparent layer between the light-shielding layer and the substrate, and strategically positioned apertures to minimize light absorption and scattering, ensuring efficient light transmission and reduced luminance loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light-shielding layer is used to block external light, then light shielding performance is improved, but light absorption occurs leading to luminance degradation
Solution Approach 1:
A transparent layer with refractive index matching is introduced as an intermediary between the light-shielding layer and the transparent substrate. This intermediate layer mediates the optical interaction, reducing light absorption by the light-shielding layer while maintaining its light-blocking function. The transparent layer acts as a buffer that optimizes light transmission paths.
Solution Approach 2:
The refractive index of the transparent layer is specifically controlled to match between 1.40 and 1.70, which is lower than the transparent substrate's refractive index. This parameter optimization minimizes refraction and reflection at interfaces, reducing light scattering and absorption while maintaining effective light shielding performance.
2Illumination intensity
If the transparent layer refractive index matches the transparent substrate, then light transmission is improved, but light scattering increases
Solution Approach 1:
The refractive index of the transparent layer is precisely controlled within the range of 1.40 to 1.70, which is lower than the transparent substrate's refractive index. This optimized parameter range minimizes refraction angles and reflection coefficients at the interfaces, thereby reducing light scattering while maintaining adequate light transmission.
Solution Approach 2:
The transparent layer is positioned specifically at the interface region between the light-shielding layer and the transparent substrate, where optical transitions occur. By optimizing the refractive index of this specific local region, the patent addresses the scattering problem at the critical interface without affecting the overall light transmission properties of the entire panel.
3Illumination intensity
If the transparent layer thickness is increased to reduce light absorption, then luminance is improved, but device complexity increases
Solution Approach 1:
The transparent layer thickness is optimized within a specific range that balances light absorption reduction with structural simplicity. This optimized thickness parameter achieves adequate luminance improvement without requiring excessive layer thickness that would complicate the device structure or manufacturing process.
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 suppresses light absorption and scattering, maintaining high luminance and display quality across the panel, even at greater distances from the light-emitting elements, thereby enhancing overall display performance.
Implementation Method 1
a transparent layer disposed between the second transparent substrate and the light-shielding layer... A refractive index of the light-shielding layer is less than a refractive index of the second transparent substrate
Data Source
AI summary
According to one embodiment, a display device includes a first substrate including a first transparent substrate, a wiring portion, and a pixel electrode, a second substrate including a second transparent substrate, a common electrode opposed to the pixel electrode, a light-shielding layer overlapping the wiring portion between the second transparent substrate and the common electrode, and a transparent layer disposed between the second transparent substrate and the light-shielding layer, a liquid crystal layer including a stripe-shaped polymer and liquid crystal molecules, and light-emitting elements. A refractive index of the transparent layer is less than a refractive index of the second transparent substrate.