Backlight Unit Screwless Assembly for Uniform LED Illumination
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Solution Overview
Problem
Conventional flat panel displays using point light sources, such as LEDs, suffer from non-uniform light distribution leading to brightness variations and the occurrence of bright lines due to their small divergence angle, requiring increased thickness and cumbersome assembly with screws.
Innovation Solution
A backlight unit with a light guide plate and fixing projections/holes system that connects the substrate and light guide plate to the base chassis, allowing for uniform light diffusion and reduced thickness by eliminating the need for screws in assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a point light source (LED) with small divergence angle is used, then the light convergence is improved, but non-uniform light distribution occurs causing bright lines
Solution Approach 1:
A light guide plate is introduced as an intermediary component between the LED array and the display panel. The light guide plate receives light from the LEDs and redistributes it uniformly across the display area, mediating between the point光源's concentrated output and the panel's requirement for uniform illumination, thereby eliminating bright lines while preserving the benefits of LED light convergence
2Strength
If screws are used to connect the substrate to the base chassis, then the connection strength is improved, but the assembly complexity and thickness increase
Solution Approach 1:
The screw-based mechanical fastening system is replaced with a snap-fit mechanism. The light guide plate includes protrusions that engage with corresponding recesses in the base chassis, providing a screwless connection that maintains structural strength while eliminating threading operations, reducing assembly complexity, and decreasing overall display thickness
3Manufacturing precision
If LEDs are arranged at regular intervals, then the manufacturing precision is improved, but the light overlap becomes insufficient causing dark spots
Solution Approach 1:
The light guide plate incorporates localized optical structures (such as diffusers or refractive elements) at specific positions to enhance light redistribution in areas where LED spacing creates dark spots. This local modification of optical properties ensures uniform illumination across the entire display surface while maintaining the regular LED arrangement for manufacturing precision
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 ensures uniform light distribution across the display panel, preventing bright lines and reducing the overall thickness of the flat panel display while simplifying the assembly process.
Implementation Method 1
a light guide plate disposed between the display panel and the substrate to diffuse the lights generated from the respective LEDs
Data Source
AI summary
A flat panel display includes a base chassis, a display panel, a backlight unit connected to the base chassis to emit light to the display panel, and including a substrate mounted with a plurality of light emitting diodes (LEDs) each generating light and a light guide plate disposed between the display panel and the substrate to diffuse the lights generated from the respective LEDs, and a fixing member formed at any one of the base chassis, the substrate, and the light guide plate in order to connect the base chassis with the light guide plate. The base chassis, the substrate and the light guide plate can be conveniently assembled to one another at one time without the use of screws.