Transparent Mold Frame for LCD Backlight Illumination Uniformity
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Solution Overview
Problem
In liquid crystal display (LCD) devices, the reduction of bezel size leads to visibility of end portions of the diffusion plate and optical sheet, causing nonuniform illumination and image quality deterioration, and the need for a mold frame that can stably fix the diffusion plate without being visible as a dark area.
Innovation Solution
A transparent mold frame is designed with a first mold unit supporting the display panel and a second mold unit forming an acute angle to securely fix the diffusion plate, allowing light to pass through and preventing the mold frame from being seen as a dark area, while accommodating thermal expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the bezel size is reduced, then the display area is increased, but the end portions of the diffusion plate and optical sheet become visible causing nonuniform illumination and image quality deterioration
Solution Approach 1:
A mold frame is introduced as an intermediary component between the diffusion plate/optical sheet and the bezel. This mold frame extends to cover the end portions of the diffusion plate and optical sheet, preventing them from being visible and ensuring uniform illumination across the display area.
2Reliability
If the mold frame is made opaque to fix the diffusion plate, then the diffusion plate is stably fixed, but the mold frame appears as a dark area in the display area
Solution Approach 1:
The mold frame is made transparent instead of opaque, allowing light to pass through it. This eliminates the dark area effect while maintaining the fixing function, as the transparent mold frame still securely holds the diffusion plate and optical sheet in place.
3Stability of the object's composition
If the diffusion plate is fixed between mold frames, then the diffusion plate is stably supported, but the fixing portion of the mold frame creates a dark area
Solution Approach 1:
The mold frame material is changed from opaque to transparent, allowing light to pass through the fixing portions. This resolves the dark area issue while maintaining the structural support function for the diffusion plate.
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 transparent mold frame effectively stabilizes the diffusion plate and optical sheet, enhancing image quality by ensuring uniform illumination and hiding the mold frame from the display area, thus addressing the issues of nonuniform illumination and visibility.
Implementation Method 1
a transparent mold frame configured to fix a diffusion plate and allows light to pass through
Data Source
AI summary
A display device includes: a display panel having a display area and a non-display area; a light source unit supplying light to the display panel; a bottom chassis on which the light source unit is disposed; a mold frame coupled to the bottom chassis; and a diffusion plate fixed to the mold frame and emitting light emitted from the light source unit to the display panel, wherein the mold frame may be transparent.