Scattering Layer for Display Viewing Angle Uniformity
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Solution Overview
Problem
Display devices often exhibit inconsistent color and luminance when viewed from various angles due to insufficient scattering of light by existing polarizer and color filter configurations.
Innovation Solution
Incorporating a scattering layer with scatterers dispersed in a resin composition between the display panel and color filter layer, and using a backlight unit with blue light emission and color conversion quantum dots to optimize light scattering and uniformity, along with wire grid polarizers for improved light management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional polarizer and color filter configuration is used, then the display device structure is simple, but the color and luminance are inconsistent when viewed from various angles
Solution Approach 1:
A scattering layer is introduced as an intermediary component between the color filter layer and the liquid crystal layer. This scattering layer contains scatterers that diffuse light paths, enabling consistent color and luminance perception across various viewing angles without fundamentally altering the core display panel structure.
Solution Approach 2:
The scattering layer is positioned specifically at the color filter layer side rather than uniformly throughout the display stack. This localized approach addresses the viewing angle issue at its source (where color filtering occurs) while minimizing overall structural complexity and maintaining other display functions.
2Ease of operation
If the scattering layer thickness is increased to improve light scattering, then viewing angle consistency improves, but light loss increases
Solution Approach 1:
The thickness of the scattering layer is optimized to a specific range (1-10 μm) to achieve the optimal balance between light scattering effectiveness and light transmission. This parameter optimization ensures sufficient luminance uniformity across viewing angles while minimizing unnecessary light loss.
Solution Approach 2:
Rather than making the scattering layer extremely thick to maximize scattering, a moderate thickness (1-10 μm) is used that provides sufficient scattering effect for practical viewing angle requirements. This partial action approach avoids excessive light loss while achieving acceptable luminance uniformity.
3Ease of operation
If scatterer diameter is increased to enhance scattering effect, then viewing angle performance improves, but color accuracy deteriorates
Solution Approach 1:
The scatterer diameter is precisely controlled within the range of 0.1 to 0.5 times the wavelength of incident light. This parameter control ensures that scattering is sufficient for good viewing angle performance while maintaining color accuracy by preventing excessive wavelength-dependent scattering that would distort colors.
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 achieves uniform luminance distribution and accurate color reproduction across different viewing angles, enhancing image quality and consistency.
Implementation Method 1
a scattering layer positioned between the display panel and the color filter layer for scattering the first light
Implementation Method 2
The color filter layer may convert the first light scattered by the scattering layer into second light having a different wavelength from that of the first light
Implementation Method 3
The backlight unit may include a light source for emitting blue light and may include a color conversion sheet with a red color conversion quantum dot and a green color conversion quantum dot, wherein the blue light emitted from the light source may pass through the color conversion sheet to be converted into white light
Implementation Method 4
At least one of the first polarizer and the second polarizer may be a wire grid polarizer
Data Source
AI summary
A display device may include a first polarizer, a second polarizer, a liquid crystal layer, a light unit, a color filter layer, and a particle set. The second polarizer may overlap the first polarizer. The liquid crystal layer may be positioned between the first polarizer and the second polarizer. The light unit may overlap the liquid crystal layer and may provide first light. The first polarizer may be positioned between the light unit and the liquid crystal layer. The color filter layer may overlap the liquid crystal layer. The second polarizer may be positioned between the color filter layer and the liquid crystal layer. The particle set may include a plurality of particles, may overlap the liquid crystal layer, and may scatter the first light. The second polarizer may be positioned between the particle set and the liquid crystal layer.