Backlight Unit Optical Plate with Engraved Color Conversion Patterns
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Solution Overview
Problem
Existing backlight units in display devices face challenges in maintaining image quality and reliability while reducing overall thickness, which affects the performance of liquid crystal display devices and organic light emitting display devices.
Innovation Solution
A backlight unit design featuring a substrate with multiple light sources, a reflector with holes accommodating the light sources, and an optical plate with engraved patterns containing color conversion material, which enhances light diffusion and wavelength conversion, reducing the thickness and improving image quality and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the backlight unit uses conventional color conversion material placement, then the structure is simple, but the color conversion material may experience abnormalities affecting image quality
Solution Approach 1:
The optical plate incorporates a porous layer with controlled porosity (30-70%) that contains the color conversion material. This porous structure protects the color conversion material from degradation while allowing efficient light interaction, thereby improving reliability without excessive structural complexity
Solution Approach 2:
The optical plate is designed as a composite structure combining transparent resin material with a porous layer containing color conversion material. This composite approach enables both structural integrity and protected color conversion functionality, resolving the contradiction between reliability and complexity
2Reliability
If the backlight unit increases thickness to improve image quality, then image quality improves, but the overall thickness increases
Solution Approach 1:
The patent optimizes the porosity parameter of the porous layer (maintained between 30-70%) to achieve optimal balance between light interaction efficiency and color conversion material protection. This parameter optimization allows thin design while maintaining image quality
Solution Approach 2:
Instead of increasing thickness in the vertical dimension, the patent uses horizontal distribution of color conversion material within the porous layer and optimizes the lateral light propagation path. This dimensional approach maintains thin profile while achieving high image quality
3Ease of manufacture
If the optical plate uses simple flat structure, then manufacturing is easy, but light diffusion and color conversion efficiency are insufficient
Solution Approach 1:
The porous layer structure provides increased surface area and light interaction paths without significantly complicating manufacturing. The porosity (30-70%) creates natural light scattering and diffusion effects that enhance conversion efficiency while maintaining manufacturing feasibility through standard molding processes
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 proposed design maintains image quality and reliability while reducing the overall thickness of the backlight unit, enhancing light efficiency and preventing color conversion material abnormalities, thus improving the performance of display devices.
Implementation Method 1
an optical plate positioned on the plurality of light sources and the reflector and wherein the optical plate further comprises a plurality of engraved patterns on a bottom surface corresponding to each of the plurality of light sources and a color conversion portion including a color conversion material which is disposed inside of the plurality of engraved patterns
Implementation Method 2
the optical plate further comprises a plurality of engraved patterns on a bottom surface corresponding to each of the plurality of light sources
Data Source
AI summary
Embodiments of the present disclosure are related to a backlight unit and a display device, and the backlight unit in which an optical plate including an engraved pattern in which a color conversion material is disposed is positioned on a light source can be provided. As the color conversion material is disposed in the engraved pattern, a change of the color conversion material by an external factor can be prevented and an amount of the color conversion material can be reduced, thus the backlight unit providing an image quality greater or equal to a certain level and with improved reliability can be implemented easily.