Backlight Light Guide Plate Edge Segmentation for Luminance Uniformity
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Solution Overview
Problem
Conventional liquid crystal display devices face challenges in maintaining uniform luminance along the edges of the light guide plate, leading to potential image quality issues due to light diffusion and displacement risks during manufacturing and use.
Innovation Solution
A backlight apparatus featuring a light guide plate with protruding portions and gaps that serve as reflection surfaces, integrated into a frame with fitted portions, which helps in maintaining uniform luminance and preventing displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the light guide plate has smooth continuous edges, then the manufacturing process is simple, but the luminance uniformity along the edges deteriorates
Solution Approach 1:
The light guide plate edge is segmented into multiple portions (first, second, third, fourth portions) with different structures. The first and second portions have gaps that create reflection surfaces, while the third and fourth portions have different configurations. This segmentation allows different edge regions to control light reflection differently, improving luminance uniformity while maintaining manufacturability through modular design.
Solution Approach 2:
Different regions of the light guide plate edge are given different local properties. The first portion has a gap creating a reflection surface, the second portion has a different gap configuration, and the third and fourth portions have yet another configuration. This local quality variation ensures that each edge region optimally controls light reflection to achieve uniform luminance distribution.
2Device complexity
If the light guide plate uses a simple rectangular shape, then the device complexity is low, but the light reflection control and luminance uniformity deteriorate
Solution Approach 1:
The light guide plate is divided into functional segments with distinct purposes. The first portion with its gap configuration serves one reflection function, while the second portion with different gap characteristics serves another reflection function. This segmentation enables complex light control behavior while maintaining a relatively simple overall structure that is easy to manufacture.
3Device complexity
If the light guide plate lacks protruding portions, then the frame structure is simple, but the displacement prevention and positioning accuracy deteriorate
Solution Approach 1:
The protruding portions of the light guide plate are nested within corresponding recesses of the frame structure. This nesting arrangement provides precise positioning and prevents displacement during manufacturing and use. The protruding portions fit into the frame's recesses like a nested doll structure, ensuring accurate alignment without requiring complex external fixing mechanisms.
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 more uniform luminance along the edges of the light guide plate, enhancing image quality and reducing the risk of displacement, thereby improving the overall performance of liquid crystal display devices.
Implementation Method 1
The first wall provides a reflection surface for light waves carried by the light guide plate that approach the protruding portion
Data Source
AI summary
A backlight apparatus is provided that may have: a backlight having a light guide plate; and a frame supporting the backlight and having a fitted portion. The light guide plate has a light guide main body, and a protruding portion extending outward from one of side edges of the light guide main body. The protruding portion is fitted into the fitted portion. The light guide plate is provided with a gap formed at least partially in the protruding portion. The gap defines a first wall extending from one of a top surface and a bottom surface of the light guide plate toward the other of the top surface and the bottom surface. The first wall provides a reflection surface for light waves carried by the light guide plate that approach the protruding portion.