Composite Optical Sheet with Bead Diffusion for Thinner Displays
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Solution Overview
Problem
Existing liquid crystal display panels are thick and heavy due to multiple optical sheets and diffusion plates, leading to image quality degradation and luminance issues from thermal contraction and expansion.
Innovation Solution
A composite optical sheet is introduced, comprising an adhesive layer with beads and a light diffusion layer, which is directly attached to the display panel, eliminating the need for separate optical sheets and diffusion plates, and includes a refractive index gradient and air bubbles to diffuse light efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple thick optical sheets and a diffusion plate are used to uniformly disperse light, then light uniformity is improved, but panel thickness and weight increase
Solution Approach 1:
The patent combines multiple optical sheets and diffusion plates into a single composite optical sheet that integrates light diffusing particles, reflecting particles, and adhesive layers into one unified structure, thereby reducing the number of separate components and overall panel thickness while maintaining light uniformity
Solution Approach 2:
The composite optical sheet uses composite material structures including transparent resin matrices with dispersed diffusing particles (e.g., TiO2, SiO2) and reflecting particles (e.g., Al, Ag), creating a multi-functional material that performs multiple optical functions in a single layer
2Illumination intensity
If multiple thick optical sheets and a diffusion plate are used to uniformly disperse light, then light uniformity is improved, but panel weight increases
Solution Approach 1:
The patent combines multiple optical sheets and diffusion plates into a single composite optical sheet that integrates light diffusing particles, reflecting particles, and adhesive layers into one unified structure, thereby reducing the number of separate components and overall panel thickness while maintaining light uniformity
Solution Approach 2:
The patent uses thin-film structures with controlled thicknesses (e.g., adhesive layers of 1-10 μm, optical sheets of 50-200 μm) that provide sufficient optical functionality with minimal material quantity, reducing overall weight
3Illumination intensity
If existing optical sheets and diffusion plate are used, then light diffusion is achieved, but friction with the case degrades image quality
Solution Approach 1:
The patent extracts the problematic diffusion plate that contacts the case and replaces it with a composite optical sheet structure where the light diffusion function is achieved through particles embedded in adhesive layers that are bonded to the display panel, eliminating the source of friction-induced image degradation
Solution Approach 2:
The patent introduces adhesive layers as intermediary bonding interfaces between the composite optical sheet and the display panel, creating a stable bonded structure that prevents relative movement and friction with the case, thereby eliminating image quality degradation
4Illumination intensity
If existing optical sheets and diffusion plate are used, then light diffusion is achieved, but thermal contraction and expansion cause luminance issues
Solution Approach 1:
The patent extracts the problematic diffusion plate that is prone to thermal expansion issues and replaces it with a composite optical sheet structure where the light diffusion function is achieved through particles embedded in adhesive layers that are bonded to the display panel, eliminating the source of friction-induced image degradation
Solution Approach 2:
The composite optical sheet uses composite material structures including transparent resin matrices with dispersed diffusing particles (e.g., TiO2, SiO2) and reflecting particles (e.g., Al, Ag), creating a multi-functional material that performs multiple optical functions in a single layer
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 composite sheet reduces panel thickness, prevents image quality degradation by avoiding thermal expansion issues, and enhances light diffusion, resulting in improved luminance and reduced panel weight.
Implementation Method 1
Each of the plurality of beads includes: a core layer; and an outer layer surrounding the core layer. A refractive index of the core layer is greater than a refractive index of the outer layer. A refractive index of the outer layer is greater than a refractive index of the adhesive material.
Implementation Method 2
The light diffusion layer includes: two support layers facing each other; and a plurality of prisms formed between the support layers. The plurality of prisms includes particles therein.
Implementation Method 3
The display panel further includes an air bubble disposed in the second layer. The air bubble is formed between adjacent ones of the beads.
Data Source
AI summary
The present disclosure relates to a display panel including a composite optical sheet that can replace the existing optical sheet and diffusion plate.