Absorptive Scattering Element for Display Light Efficiency
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Solution Overview
Problem
Display apparatuses face optical loss issues due to absorption of source light by color filters, leading to reduced light-emitting efficiency, and there is a need to develop a structure that improves light-emitting efficiency while reducing external light reflectance.
Innovation Solution
Incorporating an absorptive scattering element with high optical absorptivity in specific wavelength ranges into the color control layer, which includes a light absorbing portion with higher absorptivity to green or red light, and a scattering body, to reduce external light reflectance and enhance optical conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a color filter layer is used to control color in the display apparatus, then color image production is achieved, but optical loss occurs due to absorption of source light by the color filter
Solution Approach 1:
The patent changes the optical parameters of the color control layer by incorporating an absorptive scattering element with specific transmittance characteristics. The element has high transmittance (70% or higher) for blue light (440-500 nm) and low transmittance (10% or lower) for green and red light (520-780 nm), thereby modifying how light interacts with the color control layer to reduce overall optical loss while maintaining color image production capability
2Object-affected harmful factors
If a conventional color control layer is used, then color conversion is achieved, but external light reflectance is not sufficiently reduced
Solution Approach 1:
The patent employs a composite absorptive scattering element that combines scattering functionality with wavelength-selective absorption. This composite structure includes a scattering body with a light absorbing portion having different transmittance for different wavelength ranges, enabling simultaneous reduction of external light reflectance and improvement of light-emitting efficiency within the same component
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 absorptive scattering element effectively reduces external light reflectance and improves light-emitting efficiency by absorbing unwanted light wavelengths, thereby increasing the overall light-emitting efficiency of the display apparatus.
Implementation Method 1
an absorptive scattering element having high optical absorptivity in a specific wavelength range is added
Implementation Method 2
a light absorbing portion, in which absorptivity to a green or red light is greater than absorptivity to the first light
Implementation Method 3
an absorptive scattering element provided in or on the color control layer. The absorptive scattering element includes a light absorbing portion and a scattering body
Data Source
AI summary
A display apparatus including a light emitting device layer emitting a first light having a peak wavelength of 500 nm or less, a color control layer disposed on the light emitting device layer, the color control layer including an emitting element converting the first light, a color filter layer disposed on the color control layer, and an absorptive scattering element provided in or on the color control layer. The absorptive scattering element may include a light absorbing portion, in which absorptivity of a green or red light is greater than absorptivity of the first light. Accordingly, reflectance of the display apparatus to an external light may be reduced.