Thin LCD Light Control Layer Suppresses Color Unevenness
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Solution Overview
Problem
Liquid crystal display apparatuses that switch between wide and narrow viewing angles face challenges in achieving thinness while preventing color unevenness during narrow viewing angle settings.
Innovation Solution
A liquid crystal display apparatus configuration featuring a light control layer with thin transparent substrates and a surface light source device that emits linearly polarized light, where the light control layer includes a first and second transparent substrate with a thickness of 70 μm or less and a front retardation of 100 nm or less, and a surface light source device that emits light with directivity in the normal direction, parallel to the back surface-side polarizing plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the transparent substrate thickness is reduced to achieve thinning, then the overall device thickness is reduced, but color unevenness occurs during narrow viewing angle setting
Solution Approach 1:
The patent applies parameter changes by precisely controlling the front retardation value of the transparent substrate (设定前延迟值为特定值或更小) and the thickness of the light control layer to suppress color unevenness while achieving thinning. This resolves the contradiction by optimizing specific parameters rather than simply reducing thickness.
Solution Approach 2:
The patent uses a composite structure consisting of the transparent substrate, light control layer with specific materials, and polarizing plates. This composite material approach allows the thin substrate to maintain optical performance and prevent color unevenness while achieving overall thinning.
2Adaptability or versatility
If a light control layer is used to enable viewing angle switching, then wide and narrow viewing angles can be switched, but the device thickness increases
Solution Approach 1:
The patent uses a thin film light control layer with thickness of 10 μm or less that can switch between wide and narrow viewing angles. This thin film approach enables viewing angle switching capability while minimizing the increase in device thickness.
Solution Approach 2:
The patent optimizes the thickness parameter of the light control layer to 10 μm or less and controls the front retardation of the substrate to achieve viewing angle switching with minimal thickness increase.
3Length of stationary object
If the light control layer is thinned to reduce device thickness, then portability is improved, but color unevenness occurs during narrow viewing angle setting
Solution Approach 1:
The patent resolves this contradiction by changing the parameter of front retardation value of the transparent substrate to a specific value or less, and optimizing the light control layer thickness to 10 μm or less. This allows thinning for improved portability while suppressing color unevenness through precise parameter control.
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 enables the liquid crystal display apparatus to switch between wide and narrow viewing angles while suppressing color unevenness, achieving both thinness and improved display characteristics.
Implementation Method 1
a surface light source device configured to emit, from a light emitting surface opposed to the light control layer, light which has directivity in an approximately normal direction of the light emitting surface, and which contains a linearly polarized light component that vibrates in a specific direction at a high ratio
Implementation Method 2
a light control layer which includes in an order from the viewer side: a first transparent substrate; a first transparent electrode layer; a composite layer of a polymer matrix and a liquid crystal compound
Implementation Method 3
a liquid crystal panel which includes: a liquid crystal cell; a viewer-side polarizing plate arranged on the viewer side of the liquid crystal cell; and a back surface-side polarizing plate arranged on an opposite side to the viewer side of the liquid crystal cell
Data Source
AI summary
The liquid crystal display apparatus includes: a liquid crystal panel; a light control layer; and a surface light source device, wherein the liquid crystal panel includes: a liquid crystal cell; a viewer-side polarizing plate; and a back surface-side polarizing plate, wherein the light control layer includes a first transparent substrate; a first transparent electrode layer; a composite layer of a polymer matrix and a liquid crystal compound; a second transparent electrode layer; and a second transparent substrate, wherein the first transparent substrate and the second transparent substrate each independently have a thickness of 70 μm or less, wherein the first transparent substrate and the second transparent substrate each independently have a front retardation at a wavelength of 590 nm of 100 nm or less, wherein the surface light source device is configured to emit light which has directivity in an approximately normal direction of the light emitting surface.