Selective Wavelength Absorbing Member for Display Black Image Quality
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Solution Overview
Problem
Current light emitting display apparatuses suffer from low light emission efficiency due to internal reflections, resulting in reduced luminance and increased power consumption, as well as poor visual characteristics of black images caused by high diffuse reflectance.
Innovation Solution
Incorporating a selective wavelength absorbing member, such as a long wavelength absorption dye or film, in the light emitting display apparatus to reduce diffuse reflectance and improve light emission efficiency by absorbing light in the range of 640 nm to 680 nm, which is incident on the member, thereby enhancing the visual characteristics of black images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional light emitting display apparatus is used, then light is emitted from light emitting elements, but light emission efficiency is reduced due to internal reflections and total reflection at interfaces
Solution Approach 1:
The patent applies the principle of converting harmful internal reflections into beneficial effects by introducing a reflective reduction member that selectively absorbs long-wavelength light. This member converts the harmful reflected light into absorbed energy, preventing multiple internal reflections while maintaining useful light emission. The reflective reduction member is positioned to intercept reflected light paths and absorb specific wavelengths, thereby improving light emission efficiency by reducing energy loss through internal reflections.
2Illumination intensity
If light emission efficiency is improved by reducing internal reflections, then luminance increases, but diffuse reflectance also increases causing poor visual characteristics of black images
Solution Approach 1:
The patent applies local quality by making the reflective reduction member wavelength-selective, with different absorption characteristics for different wavelength ranges. The member is designed to absorb long-wavelength light (which contributes to diffuse reflectance and poor black image quality) while allowing short-wavelength light to pass through. This localized wavelength-selective absorption property enables simultaneous improvement of luminance and black image visual characteristics by targeting specific wavelength ranges for absorption.
Solution Approach 2:
The patent utilizes color changes through the wavelength-selective absorption properties of the reflective reduction member. By absorbing long-wavelength light (red region) and transmitting short-wavelength light (blue-green region), the member effectively changes the spectral composition of transmitted light. This color-selective absorption mechanism allows the display to achieve better black image quality by reducing long-wavelength diffuse reflectance while maintaining overall luminance through short-wavelength transmission.
3Object-generated harmful factors
If a selective wavelength absorbing member is introduced to reduce diffuse reflectance, then visual characteristics of black images improve, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the reflective reduction member to perform multiple functions simultaneously: it acts as both a reflective reduction member and a wavelength-selective absorbing member. This multi-functional component reduces diffuse reflectance, improves black image quality, and maintains light emission efficiency all through a single integrated element. By combining multiple functions into one component, the patent minimizes device complexity while achieving the desired performance improvements.
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 selective wavelength absorbing member effectively reduces diffuse reflectance and improves light emission efficiency, leading to increased luminance and better visual characteristics of black images without compromising light emission efficiency, thus addressing the limitations of existing technologies.
Implementation Method 1
the selective wavelength absorbing member will reduce diffuse reflectance for light of a long wavelength, which is incident on the selective wavelength absorbing member
Data Source
AI summary
A light emitting display apparatus is disclosed, which can improve visual characteristic of a black image in accordance with reduction of diffuse reflectance while improving light emission efficiency of light emitted from a light emitting diode. The light emitting display apparatus comprises a substrate including a plurality of pixel areas, a light emission pattern arranged in each of the plurality of pixel areas, a light emitting device layer arranged over the light emission pattern, and a selective wavelength absorbing member overlapped with at least one of the plurality of pixel areas, wherein the selective wavelength absorbing member may reduce transmittance of light of a long wavelength, which is incident.