Edge-Type Backlight Unit Light Guide Plate Hot Spot Prevention
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Solution Overview
Problem
Edge-type backlight units in LCD devices suffer from non-uniform light distribution, leading to hot spots due to the uneven arrangement of light sources, which results in varying luminance across the display panel.
Innovation Solution
The backlight unit is designed with a light guide plate divided into regions, where the first region near the light sources features engraved patterns to increase the directional angle of light, and the second region, with shallower patterns, converts line light into plane light, ensuring uniform distribution across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the light source is disposed at the edge of the light guide plate, then the structure is simplified and the light source arrangement is easier, but the light distribution becomes non-uniform causing hot spots
Solution Approach 1:
The light guide plate is divided into different regions with different pattern densities. The first region adjacent to the light source has a first density of patterns, while the second region farther from the light source has a second density of patterns. This local variation in pattern density allows each region to receive and distribute light appropriately, preventing hot spots while maintaining the edge-type simplified structure.
2Illumination intensity
If patterns are engraved in the light guide plate to improve light distribution, then light uniformity is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent varies the density of patterns in different regions of the light guide plate. The first region has a first density of patterns and the second region has a second density of patterns, where the densities differ to optimize light distribution. This parameter change approach allows for improved light uniformity while using a single manufacturing process, as it only requires adjusting pattern spacing rather than implementing completely different fabrication methods.
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 configuration effectively prevents hot spots and ensures uniform luminance across the display panel by diffusing light more evenly, addressing the issue of non-uniform light distribution.
Implementation Method 1
a first region including a light incidence surface and a second region extending from the first region, wherein the first region is provided with a first pattern, the second region is provided with a second pattern
Implementation Method 2
the first region is provided with a first pattern, the second region is provided with a second pattern
Implementation Method 3
This configuration effectively prevents hot spots and ensures uniform luminance across the display panel by diffusing light more evenly
Data Source
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AI summary
The present disclosure relates to a backlight unit and a display device including the backlight unit. The backlight unit includes a first pattern in a first region of a light guide plate including a light incidence surface and a second pattern in a second region of the light guide plate extending from the first region, so that, in the first region, a directional angle of light can be improved so as to prevent the occurrence of hot spots, and in the second region, a line light source can be converted into a plane light source.