Light-Transmitting Substrate with Flat Translucent Particles for LCD Uniformity
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Solution Overview
Problem
Existing light diffusion films in liquid crystal display devices suffer from low total light transmittance, durability issues, and inability to prevent luminance unevenness and moiré interference, while also being complex to produce.
Innovation Solution
A light-transmitting substrate with an uneven profile formed from a thermoplastic resin containing flat translucent particles, optimized with specific tilt angle distributions and average distances between troughs and crests, which is used to create a polarizing plate that enhances display uniformity and reduces moiré interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a conventional diffusion sheet is used to achieve uniform light diffusion, then surface uniformity is improved, but device thickness increases and production complexity increases
Solution Approach 1:
The patent combines the light diffusion function with the polarizing plate by forming a light diffusion layer on the polarizing plate's surface. This merging eliminates the need for a separate diffusion sheet, reducing the number of members while maintaining surface uniformity. The light diffusion layer is formed by dispersing particles (such as porous particles or spherical particles) within the polarizing plate structure itself.
Solution Approach 2:
The polarizing plate is designed to perform multiple functions: polarization, light diffusion, and surface uniformization. By integrating the light diffusion layer into the polarizing plate structure, the same component serves both as a polarizing element and a light diffusion element, eliminating the need for separate dedicated components.
2Length of moving object
If the distance between backlight source and diffusion sheet is decreased for thinning LCD, then device thickness is reduced, but light diffusion uniformity deteriorates
Solution Approach 1:
The light diffusion layer is designed with specific local properties to compensate for the reduced distance. By controlling the particle size, concentration, and distribution within the light diffusion layer, the patent achieves effective light diffusion even when the overall distance between components is minimized. The layer's optical properties are optimized for close-proximity operation.
Solution Approach 2:
The patent changes the optical parameters of the light diffusion layer by selecting specific particle types (porous particles with controlled pore sizes, spherical particles with specific diameters) and controlling their concentration and distribution. These parameter adjustments enable the layer to provide sufficient light diffusion over short distances, maintaining uniformity despite the reduced spacing.
3Shape
If a light diffusion layer with porous particles is used to improve light diffusion, then surface uniformity is improved, but total light transmittance decreases
Solution Approach 1:
The patent uses different types of particles with specific local properties to balance light diffusion and transmittance. Porous particles provide diffusion through their pore structure, while spherical particles provide diffusion through their shape and size distribution. By carefully selecting and combining these particle types, the layer achieves effective diffusion without excessive light absorption, maintaining acceptable transmittance levels.
Solution Approach 2:
The light diffusion layer is formed as a composite material containing multiple types of particles (porous particles and spherical particles) dispersed within the polarizing plate matrix. This composite structure allows different particle types to contribute differently to the diffusion process while maintaining overall optical transparency. The composite design enables optimization of both diffusion performance and light transmittance simultaneously.
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 provides high durability and uniformity in liquid crystal display devices, maintaining high front white luminance while reducing moiré interference and luminance unevenness, and simplifies the production process.
Implementation Method 1
a light-transmitting substrate having an uneven profile on at least one surface... which is formed of a thermoplastic resin and contains a flat translucent particle
Data Source
AI summary
A light-transmitting substrate has an uneven profile on at least one surface thereof, the light-transmitting substrate contains a thermoplastic resin and a flat translucent particle; a tilt angle of the uneven profile on at least one surface of the light-transmitting substrate has the following distribution:(a) an integral value of frequencies of from 0° to less than 1.0° is from 0% to less than 25%,(b) an integral value of frequencies of from 1.0° to less than 10° is from 60% to less than 100%, and(c) an integral value of frequencies of 10° or more is from 0% to less than 25%,andan average distance between trough and crest in the uneven profile is from 10 to 300 μm.