Micro-LED Black Layer Structure for White Turbidity Reduction
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Solution Overview
Problem
The use of light scattering materials in Micro-LED displays to improve color viewing angle characteristics often results in a white turbidity phenomenon, which deteriorates the black impression and blackness of digital signage.
Innovation Solution
A display device structure that includes a semiconductor light-emitting device, a wiring substrate, a diffusion layer with light scattering material, and a first black layer structure with transparent layers, which is thermally compressed and bonded without an adhesive layer, to maintain or improve the black impression while enhancing color viewing angle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If light scattering materials are added to the coating layer to improve color viewing angle characteristics, then color viewing angle is improved, but white turbidity phenomenon occurs and black impression deteriorates
Solution Approach 1:
The patent extracts the light scattering function from the coating layer by introducing a separate diffusion layer containing light scattering materials. This separation removes the harmful white turbidity effect from the coating layer while preserving the color viewing angle improvement function in the dedicated diffusion layer.
Solution Approach 2:
The patent segments the display structure into distinct functional layers: a coating layer without light scattering materials and a separate diffusion layer with light scattering materials. This segmentation allows each layer to perform its specific function without interfering with the other, preventing white turbidity while maintaining color viewing angle characteristics.
2Object-generated harmful factors
If a black film layer is placed on the coating layer to improve black impression, then black impression is improved, but adhesive layers with low optical transparency are required
Solution Approach 1:
The patent extracts the blackening function from the coating layer by introducing a dedicated black film layer. This allows the coating layer to maintain its optical transparency without the black film, while the separate black film layer provides the necessary black impression improvement.
Solution Approach 2:
The patent segments the structure into a transparent coating layer and a separate black film layer, eliminating the need for low-transparency adhesive layers. The black film layer is positioned to provide blackening effect while the coating layer remains optically transparent for light transmission.
3Adaptability or versatility
If a grinding process is performed to improve color viewing angle, then color viewing angle is improved, but mechanical damage occurs to the semiconductor light-emitting device
Solution Approach 1:
The patent replaces the mechanical grinding process with a material-based solution by introducing a diffusion layer with light scattering materials. This substitution eliminates mechanical damage to the semiconductor light-emitting device while achieving the same color viewing angle improvement through optical means.
4Adaptability or versatility
If the coating layer thickness is increased to secure color viewing angle, then color viewing angle is improved, but black impression deteriorates
Solution Approach 1:
The patent segments the optical functions into separate layers: the coating layer maintains optimal thickness for black impression while the diffusion layer provides color viewing angle improvement. This segmentation allows each layer to be optimized for its specific function without compromise.
Solution Approach 2:
The patent extracts the color viewing angle improvement function from the coating layer by introducing a dedicated diffusion layer. This allows the coating layer to be kept thin for good black impression while the diffusion layer provides the necessary color viewing angle characteristics.
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 solution effectively reduces the distribution of scattering materials, maintains or improves the black impression, and increases frontal luminance by improving light transmittance, thereby addressing the issues of white turbidity and reduced blackness in Micro-LED displays.
Implementation Method 1
a diffusion layer 165 disposed on the semiconductor light-emitting device 110 and including a light scattering material 160
Implementation Method 2
a first black layer structure 180 disposed on the diffusion layer 165 and including a transparent layer, wherein the first black layer structure 180 is thermally compressed and bonded on the diffusion layer 165
Data Source
AI summary
A display device including a semiconductor light-emitting device according to an embodiment may include a wiring substrate, a semiconductor light-emitting device disposed on the wiring substrate, a diffusion layer disposed on the semiconductor light-emitting device and including a light scattering material, and a first black layer structure disposed on the diffusion layer and including a transparent layer. The first black layer structure including the transparent layer may include one or more transparent layers between the plurality of black layers. The first black layer structure including the transparent layer may include a first black layer, a first transparent layer disposed on the first black layer, and a second black layer disposed on the first transparent layer. The first black layer structure including the transparent layer may include a second transparent layer disposed on the second black layer and a third black layer disposed on the second transparent layer.