Backlight Unit Reflective Plate Inclined Structure Light Distribution
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Solution Overview
Problem
Slimmed backlight units in display devices often result in inadequate light distribution, leading to dark areas and bright lines due to insufficient or concentrated light supply, compromising display brightness uniformity.
Innovation Solution
A backlight unit with a reflective unit featuring a bent structure and a light absorption pattern applied to prevent dark areas and bright lines by ensuring uniform light distribution across the display panel, utilizing a cover bottom with an inclined surface and a reflective sheet with a step structure and light absorption pattern to adjust light incidence and reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the backlight unit is reduced in thickness, then the display device becomes slimmer, but light cannot be supplied sufficiently to specific areas of the display panel
Solution Approach 1:
The reflective plate is bent to form multiple surfaces (first inclined surface, second inclined surface, third inclined surface) at different angles and positions. This three-dimensional configuration redirects light from the edge light source to reach the entire display panel area, compensating for the reduced thickness of the backlight unit.
Solution Approach 2:
The reflective plate is divided into multiple functional segments with different orientations: a first inclined surface for redirecting light upward, a second inclined surface for lateral redistribution, and a third inclined surface for additional angle adjustment. Each segment performs a specific light redirection function to achieve comprehensive illumination.
2Shape
If the edge area of the slimmed backlight unit has an inclined structure, then the appearance is improved, but light concentrates in specific areas causing non-uniform display brightness
Solution Approach 1:
Different regions of the reflective plate are configured with different surface orientations and angles tailored to their specific functions. The first inclined surface addresses light deficiency in the upper area, the second inclined surface handles lateral light distribution, and the third inclined surface fine-tunes the light angles. Each local region has optimized properties to achieve overall uniform illumination.
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 effectively prevents dark areas and bright lines, achieving uniform brightness across the display panel by optimizing light supply and reflection, thereby enhancing the overall display quality.
Implementation Method 1
a reflective unit including a first part disposed in the bottom surface, a second part connected to the first part and having a first angle with respect to the first part and a third part connected to the second part and having a second angle with respect to the second part
Data Source
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AI summary
Some embodiments of the present disclosure relate to a backlight unit and a liquid crystal display device, in a case where an edge area of a cover bottom is formed in an inclined structure, a reflective unit, such as a reflective sheet, forming a step structure is disposed in the boundary between a bottom surface and an inclined surface of the cover bottom, and thus a sufficient amount of light can be uniformly supplied to a lower portion of the panel corresponding to an edge area of the cover bottom. In addition, since a light absorption pattern is applied to a step structure of the reflective unit, a bright line resulted from concentrating of the light reflected from the step structure of the reflective unit, in a specific area is prevented and improved luminance and uniformity of light can be provided in an area of the panel corresponding to an inner side of the inclined surface and the inclined surface of the cover bottom.