LCD Middle Frame Recess Design for Borderless Backlight Assembly
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Solution Overview
Problem
Current liquid crystal display devices face challenges in achieving ultra-thin and borderless designs while maintaining image quality and light mixing efficiency, particularly in the production of LCD TVs with direct-type backlight modules.
Innovation Solution
The liquid crystal display device incorporates a back plate with integral side walls and a middle frame assembly that includes recessed structures to support the diffusion plate, reflective sheet, and optical film, optimizing light mixing and appearance through a three-segment design and integral bending for enhanced strength and assembly efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a direct-type backlight module is used to achieve better image quality, then illumination intensity is improved, but device complexity increases due to the need for precise component positioning and assembly
Solution Approach 1:
The patent integrates the middle frame, diffusion plate holder, and light guide plate holder into a single integrated middle frame structure. This merging of components simplifies the overall assembly process while maintaining the precise positioning needed for direct-type backlight modules to achieve optimal display brightness and image quality.
Solution Approach 2:
The middle frame structure serves multiple functions simultaneously: it provides structural support, holds the diffusion plate, supports the light guide plate, and enables precise positioning of optical components. This multi-functionality reduces the number of separate components needed, thereby reducing assembly complexity while maintaining illumination performance.
2Length of moving object
If ultra-thin design is pursued to reduce device thickness, then length is reduced, but manufacturing precision requirements increase to maintain structural integrity and assembly accuracy
Solution Approach 1:
The patent divides the middle frame into distinct functional segments: a first middle frame portion for holding the diffusion plate and a second middle frame portion for supporting the light guide plate. This segmentation allows each portion to be optimized for its specific function while maintaining overall structural integrity in ultra-thin designs, reducing the need for high manufacturing precision across the entire structure.
Solution Approach 2:
The patent positions the diffusion plate and light guide plate in different spatial dimensions and orientations within the integrated middle frame structure. This dimensional arrangement allows for simplified manufacturing and assembly in ultra-thin devices, as components can be positioned and secured more easily in three-dimensional space rather than requiring extreme precision in a single plane.
3Shape
If borderless design is implemented to eliminate visible frames, then shape is improved for aesthetic purposes, but device complexity increases due to the need for precise component alignment and hidden support structures
Solution Approach 1:
The integration of multiple support and positioning functions into the single middle frame structure eliminates the need for additional visible frame elements or complex alignment mechanisms. The middle frame is designed to provide all necessary support and positioning while remaining inconspicuous, enabling a true borderless appearance without proportionally increasing device complexity.
Data Source
AI summary
The present disclosure describes a liquid crystal display device. The liquid crystal display device includes a back plate, a middle frame and a diffusion plate. The back plate includes a bottom portion, and a side wall perpendicular to the bottom portion. The middle frame includes a first support portion and a second support portion which are disposed in opposite, and a middle frame connection portion. The middle frame connection portion connects the first support portion and the second support portion. The first support portion is parallel to the bottom portion. The first support portion, the second support portion and the middle frame connection portion form a recess. A portion of the diffusion plate is within the recess.