Display Device Light-Diffusing Layer Protrusion
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Solution Overview
Problem
Existing display devices with wavelength conversion layers containing optically isotropic semiconductor particles and light-diffusing layers face inefficiencies in light energy conversion due to insufficient luminous efficiency and increased haze, complicating production and reducing light transmission to the display screen.
Innovation Solution
A display device with a light-diffusing layered body comprising a wavelength conversion layer and a light-diffusing layer on at least one surface, where the light-diffusing layer has projections and depressions formed by light-diffusing particles protruding 3 to 50% from the surface, and internal scattering particles with a higher refractive index than the binder resin, optimizing light energy conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If diffusing particles are added throughout the wavelength conversion layer, then light energy conversion efficiency is improved, but haze increases and light transmission to the display screen decreases
Solution Approach 1:
The patent divides the light-diffusing particles into two distinct groups: internal scattering particles (first light-diffusing particles) with a refractive index higher than the binder resin, and surface diffusing particles (second light-diffusing particles) with a refractive index lower than the binder resin. This segmentation allows each particle type to perform its specific function optimally - internal particles enhance light conversion efficiency through scattering, while surface particles control haze and improve light transmission to the display screen.
Solution Approach 2:
The patent applies different refractive index characteristics to different particle types based on their functional requirements. Internal scattering particles use high refractive index materials to maximize light scattering and energy conversion, while surface diffusing particles use low refractive index materials to minimize haze and maintain light transmission. This local quality differentiation resolves the contradiction between improving energy conversion and maintaining light transmission.
2Loss of energy
If multiple materials are dispersed in the binder component, then light energy conversion efficiency is improved, but the number of factors to consider increases and production becomes complicated
Solution Approach 1:
The patent segments the diffusing particles into two functional categories with clearly defined refractive index relationships to the binder resin. This segmentation provides a systematic framework for material selection and dispersion process control, reducing production complexity despite using multiple materials. The clear distinction between internal and surface particles simplifies quality inspection and process parameter optimization.
3Loss of energy
If the wavelength conversion layer is made thicker, then light energy conversion efficiency is improved, but haze increases and light transmission decreases
Solution Approach 1:
The patent applies different refractive index characteristics to internal and surface particles to optimize light interaction at different depths and locations within the wavelength conversion layer. This local quality differentiation allows the layer to maintain sufficient thickness for effective wavelength conversion while controlling overall haze and maintaining light transmission to the display screen.
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 significantly improves light energy conversion efficiency while maintaining sufficient light transmission to the display screen, enhancing the overall performance of the display device.
Implementation Method 1
a wavelength conversion layer containing optically isotropic semiconductor particles
Implementation Method 2
a light-diffusing layer containing a binder component and light-diffusing particles that contain an organic material or an inorganic material, the light-diffusing layer having projections and depressions on the outermost surface due to the light-diffusing particles protruding therefrom
Implementation Method 3
internal scattering particles with a higher refractive index than the binder resin
Data Source
AI summary
The present invention provides a display device having excellent light energy conversion efficiency. The present invention relates to a display device including a light-diffusing layered body. The light-diffusing layered body includes a wavelength conversion layer containing optically isotropic semiconductor particles and a light-diffusing layer on at least one surface of the wavelength conversion layer. The light-diffusing layer contains a binder component and light-diffusing particles that contain an organic material or an inorganic material. The light-diffusing particles protrude in a range of 3 to 50% of the particle size of the light-diffusing particles from an outermost surface of the light-diffusing layer. The light-diffusing layer has projections and depressions on the outermost surface due to the light-diffusing particles protruding therefrom. The light-diffusing layer has a film thickness of 1 to 30 μm.