Backlight Module Eliminating Region Light Guide Plate
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Solution Overview
Problem
Conventional back light modules suffer from light-jetting effects around the recess parts, leading to uneven light emission and mura defects in display devices, which affect the display quality.
Innovation Solution
A back light module design featuring a light guide plate with micro-structures and eliminating regions on its upper and lower surfaces, positioned within a frame, where the micro-structures are arranged parallel except for specific eliminating regions that prevent light interference with the positioning structure, ensuring even light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a positioning structure is arranged on the light guide plate to support and position it in the frame, then the light guide plate can be properly positioned, but light-jetting effect occurs around the recess part leading to uneven light emission
Solution Approach 1:
The patent applies local quality by creating a first eliminating region on the upper surface of the light guide plate where micro-structures are specifically removed or not formed in the area surrounding the positioning structure. This local modification eliminates light-jetting effects at the problematic location while preserving micro-structures in other areas to maintain overall light diffusion functionality, thus resolving the contradiction between positioning stability and light emission uniformity.
2Illumination intensity
If micro-structures are arranged on the upper surface of the light guide plate to diffuse light, then light emission is enhanced, but light-jetting effect occurs around the positioning structure causing mura defects
Solution Approach 1:
The patent applies the taking out principle by extracting or removing micro-structures from specific locations to eliminate harmful light-jetting effects. The first eliminating region is defined as an area where micro-structures are not formed or are removed, specifically targeting the region around the positioning structure that causes light interference, while maintaining micro-structures in other areas for light diffusion.
3Reliability
If the light guide plate design includes supporting pins or blocks between the light guide plate and frame, then the light guide plate is properly supported, but the periphery shape must correspond to the supporting structure creating recess parts
Solution Approach 1:
The patent applies segmentation by dividing the upper surface of the light guide plate into different functional regions: areas with micro-structures for light diffusion and a first eliminating region without micro-structures around the positioning structure. This segmentation allows the light guide plate to maintain structural support requirements while eliminating optical interference in specific localized areas.
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 design achieves an even light-emitting effect by eliminating light-jetting issues around the positioning structure, thereby enhancing the display quality of the display device by reducing mura defects.
Implementation Method 1
The first micro-structures extend along a first axial direction and are arranged in parallel on the upper surface except the first eliminating region... the light emitted by the point light sources enters the light guide plate from the light incident surface to be emitted from the upper surface
Implementation Method 2
the light emitted by the point light sources enters the light guide plate from the light incident surface to be emitted from the upper surface
Data Source
AI summary
A backlight module including a light guide plate, a plurality of point light sources and a frame is provided. The light guide plate includes a body, a positioning structure and a plurality of first micro-structures. The body has at least one light incident surface, an upper surface connected with the light incident surface, and at least one side surface connected with the light incident surface and the upper surface. The positioning structure is located on the side surface, wherein the upper surface has a first eliminating region adjacent to and surrounding the positioning structure. The first micro-structures are arranged on the upper surface except the first eliminating region. The point light sources face the light incident surface. The light guide plate is positioned in the frame by matching the positioning structure with a positioning component of the frame. A display device including the backlight module aforementioned is also provided.