Backlight Unit With Pattern Layer For Uniform Luminance
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Solution Overview
Problem
Conventional backlight units for display apparatuses face limitations in reducing thickness, improving image quality, and simplifying manufacturing processes, particularly due to the need for a slim design and uniform luminance distribution.
Innovation Solution
A backlight unit design that closely contacts a display panel, featuring a layered structure with light sources emitting in different directions, a pattern layer for light reflection, and a resin layer for uniform luminance, allowing for a slim and efficient display apparatus with improved image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional backlight unit with fluorescent lamp is used, then the display apparatus can provide sufficient illumination, but the thickness of the display apparatus cannot be reduced
Solution Approach 1:
The patent combines multiple light sources (first and second light sources) into a single backlight unit structure, merging their functions to provide sufficient illumination while maintaining a slim profile. The light guides integrate the optical paths of multiple sources, allowing compact arrangement that reduces overall thickness.
Solution Approach 2:
The patent transitions from a single-direction light emission approach to multi-directional light emission by arranging light sources and light guides in different spatial orientations. This dimensional arrangement allows light to be distributed effectively across the display panel while keeping the backlight unit thin.
2Manufacturing precision
If light sources are arranged to provide uniform luminance, then image quality improves, but the structural complexity of the backlight unit increases
Solution Approach 1:
The patent applies different properties to different parts of the light guides - the first light guide has a first reflective plate with specific reflectivity, while the second light guide has a second reflective plate with different reflectivity. This local differentiation allows each region to be optimized for its specific function, achieving uniform overall luminance while keeping the structure manageable.
Solution Approach 2:
The patent changes the reflectivity parameter of the reflective plates to achieve uniform luminance distribution. By adjusting the reflectivity of different reflective plates, the patent balances the light output from multiple sources without requiring complex structural modifications.
3Manufacturing precision
If multiple light guides with different reflectivities are used, then uniform luminance distribution is achieved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent divides the backlight unit into separate light guides (first and second light guides) with distinct reflective properties. This segmentation allows each light guide to be manufactured and optimized independently, then assembled into the final structure, simplifying the overall manufacturing process while achieving uniform luminance.
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 enables a thinner display apparatus with enhanced image quality by providing uniform luminance and simplifying the manufacturing process, reducing the risk of malfunction and foreign substance ingress.
Implementation Method 1
a reflective plate and a liquid crystal display apparatus with such a reflective plate. The reflective plate includes a first reflective part having a predetermined surface roughness and a second reflective part having a surface roughness that is less than the predetermined surface roughness of the first reflective part.
Implementation Method 2
An optical sheet is disposed over the LEDs. At least a portion of light entering one side of the optical sheet from the LEDs is guided within the optical sheet in the direction generally parallel to the substrate.
Data Source
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AI summary
The present invention relates to an optical assembly, a backlight unit, and a display apparatus thereof. According to an embodiment of the present invention, an optical assembly includes a substrate, a plurality of light sources disposed over the substrate, a reflective layer, a light guide that is disposed above the substrate and covering the plurality of light sources and the reflective layer, and a pattern layer formed on the reflection layer.