Gradient Plastic Frame for LCD Light Leakage Prevention
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Solution Overview
Problem
Current liquid crystal display devices face issues with light leaking due to thin plastic frames, which require thicker frames to prevent leakage, increasing production costs and failing to meet narrow frame requirements.
Innovation Solution
A liquid crystal display device with a plastic frame that gradually changes color from white to black using 3D printing, composed of multiple sub-layers with varying thickness and gray levels, where the inner and outer layers are thicker than the middle layers, to absorb penetrating light and prevent leakage without increasing frame thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the plastic frame wall is made thinner to meet narrow frame requirements, then the frame thickness is reduced, but light leaking occurs
Solution Approach 1:
The plastic frame is designed with non-uniform thickness distribution, where the inner wall portion has greater thickness than the outer wall portion. This local quality variation allows the frame to maintain overall thinness while concentrating light-blocking material where most needed near the liquid crystal layer, preventing light leaking without increasing overall frame thickness.
Solution Approach 2:
The plastic frame incorporates multiple materials with different optical properties - a light-absorbing material (such as black plastic) for the inner wall portion and a light-diffusing material (such as white plastic) for the outer wall portion. This composite material approach enables the thin frame to effectively block light leakage through the inner layer while the outer layer provides aesthetic appearance and additional light scattering.
2Object-affected harmful factors
If a black tape is attached to the outermost side of the plastic frame to prevent light leaking, then light leaking is prevented, but the module size changes and production cost increases
Solution Approach 1:
The light-blocking function previously requiring a separate black tape attachment is merged into the plastic frame structure itself. The inner wall portion of the frame is directly formed with light-absorbing material, eliminating the need for separate tape components and assembly steps, thereby simplifying the production process while maintaining light leakage prevention.
Solution Approach 2:
The plastic frame is designed to perform multiple functions simultaneously: structural support, aesthetic appearance, and light leakage prevention. By integrating the light-blocking inner wall portion directly into the frame structure, the frame becomes a multi-functional component that eliminates the need for separate light-blocking tapes and their associated assembly processes.
3Object-affected harmful factors
If a dual-color plastic frame is formed by sequential molding processes, then light leaking is prevented, but the frame thickness increases to at least 0.8 mm
Solution Approach 1:
The plastic frame is segmented into distinct functional zones with different thicknesses and materials - the inner wall portion with greater thickness containing light-absorbing material, and the outer wall portion with lesser thickness providing appearance. This segmentation allows optimization of material distribution to prevent light leakage without requiring uniform thick construction throughout the entire frame.
Solution Approach 2:
The frame design utilizes parameter changes in material composition and thickness distribution - transitioning from uniform thick construction to variable thickness with light-absorbing inner layer and lighter outer layer. This parameter optimization enables effective light blocking at minimal thickness, achieving the light leakage prevention function without the 0.8 mm minimum thickness requirement of traditional dual-color molding.
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 effectively reduces light leakage by absorbing light with the black outer layers while maintaining a thin frame, eliminating the need for external black tape and reducing production costs, allowing for thinner frames that meet narrow frame requirements.
Implementation Method 1
A color of the plastic frame changes from white to black, from a side close to the liquid crystal layer to a side far from the liquid crystal layer, to prevent light leaking
Data Source
AI summary
A liquid crystal display device is provided. The liquid crystal display device includes a plastic frame, used to install a liquid crystal display panel. A color of the plastic frame changes from white to black, from a side close to the liquid crystal layer to a side far from the liquid crystal layer, to prevent light leaking. The color of the plastic frame changes gradually from white to black from inside to outside, so as to reduce a thickness of the plastic frame while preventing light leaking.