Curved LCD Substrate with Composite Plastic-Glass Structure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current liquid crystal display devices face challenges in forming a high-performance, thin-film transistor substrate on plastic due to thermal expansion coefficient differences between glass and plastic substrates, leading to damage during heat processing and bending, which results in mechanical stress and instability in curved shapes.
Innovation Solution
A liquid crystal display device with a substrate structure that combines a plastic substrate with a thin-film glass substrate, featuring a curved shape with positive and negative curvatures to balance mechanical stresses, and a resin member to hold the shape and alleviate residual stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a plastic substrate is used instead of glass substrate to achieve light-weight and thin structure, then weight and thickness are reduced, but the substrate cannot withstand high-temperature processes (350°C to 600°C) required for manufacturing thin film transistors
Solution Approach 1:
The patent uses a composite substrate structure consisting of a plastic substrate and a glass substrate bonded together. The plastic substrate provides light weight and thinness, while the glass substrate provides heat resistance. This composite structure allows the substrate to withstand high-temperature processes (350°C to 600°C) required for manufacturing thin film transistors while maintaining the advantages of plastic materials.
2Shape
If a glass substrate is thinned to enable curving, then flexibility and curved shape capability are improved, but the substrate becomes vulnerable to mechanical stress and damage during bending
Solution Approach 1:
The patent employs a composite structure of plastic and glass substrates where the combination provides both curving capability and mechanical strength. The plastic substrate contributes flexibility enabling the curved shape, while the glass substrate maintains mechanical strength to prevent damage during bending operations.
Solution Approach 2:
The patent utilizes thin-film structures in the composite substrate that enable flexibility and curving while maintaining integrity. The thin-film glass and plastic layers are designed to work together to achieve the desired curved shape without compromising mechanical strength.
3Stability of the object's composition
If heat pressing process is applied to cell structure with plastic and glass substrates, then bonding between substrates is improved, but thermal expansion coefficient differences cause damage or separation
Solution Approach 1:
The patent controls the heat pressing process parameters (temperature, pressure, time) to achieve proper bonding while minimizing thermal stress. The process parameters are optimized to account for the thermal expansion coefficient differences between plastic and glass substrates, preventing damage or separation during bonding.
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
This configuration prevents damage during bending and maintains a stable curved state, enhancing the reliability and quality of the liquid crystal display device by canceling stress differences and reducing distortion.
Implementation Method 1
utilizing nature that orientation of liquid crystal changes according to an electric field applied to the liquid crystal from a pixel selection electrode provided to the substrate
Implementation Method 2
source light from a backlight mounted in a rear surface side of the liquid crystal display panel is polarized by about 90 degrees in a liquid crystal layer and passed through a polarizer so that a latent electron image can be seen as a visible image
Data Source
AI summary
A liquid crystal display device preventing a liquid crystal display panel from damage by bending of a light-transmissive substrate and capable of curving a display surface of the panel is provided. The liquid crystal display device comprising: a liquid crystal display panel having a liquid crystal layer sealed between a pair of light-transmissive substrates having pixel formation electrodes on inner surfaces thereof, and formed by assembling positive and negative curved surfaces with respect to one direction; a backlight mounted on a rear surface of the panel along a curved shape of the panel and having at least one light emission device irradiating illumination light toward the rear surface; and a resin member held in a space between peripheral portions where the panel is opposed to the backlight, and fixing and holding a curved state, is provided. Distortion of the light transmissive glass substrates by bending of the panel is eased.