Backlight Unit Support Side Members for Luminance Uniformity
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Solution Overview
Problem
Direct-type liquid crystal display devices experience non-uniform light distribution, leading to dark areas at the edges of the screen, which affects image quality and makes it difficult to create large-sized displays without quality deterioration.
Innovation Solution
A backlight unit with point light sources and a support side structure featuring multiple support side members oriented at different angles to redirect light uniformly across the liquid crystal panel, ensuring even illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light sources are arranged below the liquid crystal panel in a direct-type backlight unit, then the structure is simple and manufacturing is easy, but non-uniform light distribution occurs causing dark areas at the edges
Solution Approach 1:
The support side is divided into multiple support side members (first support side member, second support side member, third support side member) with different orientations. Each segment redirects light in a specific direction to address the non-uniform light distribution problem while maintaining the overall simple structure of the direct-type backlight unit.
Solution Approach 2:
Different support side members are positioned and oriented differently to provide localized light redirection. The first support side member redirects light toward the edge area, the second support side member redirects light at a different angle, and the third support side member provides additional redirection. This local differentiation ensures uniform light distribution across different regions of the liquid crystal panel.
2Illumination intensity
If support sides are arranged to increase light supply to edge areas, then luminance uniformity improves, but the structure becomes more complex
Solution Approach 1:
The support side members serve multiple functions: they provide structural support for the liquid crystal panel, redirect light in specific directions to improve luminance uniformity, and define the optical path. By combining these functions into a single component, the invention avoids additional light redirecting elements that would increase structural complexity.
Solution Approach 2:
The support side members are integrated with the bottom cover structure, combining the support function and light redirection function into a unified structure. This merging reduces the number of separate components and simplifies the overall assembly process while achieving the light redistribution goal.
3Area of stationary object
If the bezel is narrowed to increase display area, then screen size increases, but light non-uniformity in edge areas becomes more noticeable
Solution Approach 1:
The invention addresses the light non-uniformity problem by introducing angular dimensionality through support side members with different orientations. Instead of simply increasing the display area horizontally, the solution redistributes light in multiple angular directions to ensure uniform illumination across the expanded display area, including edge regions.
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
This solution enhances luminance uniformity across the display area, preventing dark areas and improving image quality, even in large-sized displays or multi-unit configurations.
Implementation Method 1
A support side is provided to change a path of light from the plurality of point light sources toward the liquid crystal panel
Implementation Method 2
Light generated from the light sources is scattered and refracted through the diffuser plate and the optical sheets, and then spreads toward an entire surface of the liquid crystal panel
Data Source
AI summary
A backlight unit comprises a plurality of point light sources facing a rear surface of a liquid crystal panel; a bottom cover comprising a lower surface supporting the plurality of point light sources and two or more side surfaces disposed between the lower surface of the bottom cover and the liquid crystal panel; and a support side in contact with a first side surface of the bottom cover's side surfaces and in contact with the lower surface of the bottom cover in order to change a path of light from the plurality of point light sources toward the liquid crystal panel, the support side including a plurality of support side members oriented at different angles relative to the bottom cover.