Backlight Assembly Light Guide Plate Fixing Structure
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Solution Overview
Problem
Existing backlight assemblies face issues with light leakage and decreased luminance due to deformation or damage of the light guide plate and adhesive/mold fixing members caused by high temperature or humidity, leading to gaps between the light guide plate and the light source.
Innovation Solution
A backlight assembly design that includes a light guide plate, a mold with a receiving space for the light source, and a main frame with a protruding portion and hole configuration to securely attach the light guide plate, preventing gaps and ensuring stable fixation, thereby preventing light leakage and enhancing luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive or additional mold fixing member is used to fix the light guide plate to the main frame, then the light guide plate can be attached, but the adhesive or fixing member may be damaged due to high temperature or humidity, causing light leakage
Solution Approach 1:
The mold is divided into multiple portions (first mold portion, second mold portion, third mold portion) that collectively fix the light guide plate at different locations. This segmentation distributes the fixation function across multiple structural elements, eliminating reliance on a single adhesive bond and preventing light leakage through distributed mechanical support.
Solution Approach 2:
The patent replaces the chemical bonding mechanism (adhesive) with a mechanical fixing system consisting of mold portions that physically constrain the light guide plate. The mold portions act as mechanical fixtures that secure the light guide plate through geometric interlocking and physical contact, substituting the unreliable adhesive bond with a robust mechanical structure resistant to temperature and humidity.
2Ease of manufacture
If the light guide plate is fixed using adhesive, then the assembly process is simple, but the adhesive may be damaged by high temperature or humidity, creating gaps and light leakage
Solution Approach 1:
The mold portions are integrated with the main frame structure, merging the fixing function into the existing framework. The first mold portion is coupled to the side wall, while the second and third mold portions work together to secure the light guide plate, creating a unified structural system that provides both mechanical support and environmental protection without adding separate complex components.
Solution Approach 2:
Different portions of the mold provide specialized fixation functions at specific locations. The first mold portion handles side wall coupling, while the second and third mold portions specifically address light guide plate securing. This localized functional distribution optimizes the fixation performance at each critical point while maintaining overall manufacturing simplicity.
3Reliability
If the light guide plate is securely fixed to prevent deformation, then light leakage is prevented, but the structure becomes more complex
Solution Approach 1:
The mold portions serve multiple functions simultaneously: they provide mechanical fixation of the light guide plate, structural support against deformation, and prevention of light leakage. This multi-functionality reduces the need for separate dedicated components for each function, maintaining structural efficiency while achieving reliable light guide plate securing.
Data Source
AI summary
A backlight assembly includes a light guide plate, a light source, a mold and a main frame. The light guide plate includes a first surface and a second surface extending from the first surface. The light source is disposed adjacent to the first surface of the light guide plate. The mold includes an upper portion, a lower portion and a side portion. The side portion connects to the upper and lower portions to form a receiving space, and the receiving space receives the light source and the first surface of the light guide plate. The main frame includes side walls and an upper wall extending from an upper portion of the side walls, and the mold is disposed in an opening below the upper wall.