Color-Converting Substrate With Selective Reflection for Light Reuse
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Solution Overview
Problem
Current organic light-emitting display devices with color filters and color-converting parts face inefficiencies in light utilization, leading to absorption of reflected light rather than reuse, which reduces overall light efficiency.
Innovation Solution
Incorporating a light-reflective layer between the color-converting part and the color filter, featuring a stacked structure with different refractive indices or a nano-particle configuration, including silver, to selectively reflect incident light of the same wavelength, thereby preventing absorption and enhancing light efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a color filter and color-converting part are used in organic light-emitting display devices, then display quality is improved, but light efficiency deteriorates due to absorption of reflected light
Solution Approach 1:
The patent converts the harmful absorption of reflected light by the color filter into a beneficial effect by introducing a light-reflective layer that redirects the reflected light back through the color-converting part. This allows the previously wasted reflected light to be reused, transforming the energy loss into useful light output and improving overall light efficiency while maintaining display quality
Solution Approach 2:
The light-reflective layer acts as an intermediary component between the color-converting part and the color filter. It mediates the interaction between these two elements by reflecting light back through the color-converting part before it reaches the color filter, enabling light reuse without compromising the color filtering function
2Stability of the object's composition
If scattering particles are used to improve light distribution, then uniformity is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts the light scattering function from the color-converting part by implementing a dedicated light-reflective layer with specific reflective properties. This separation allows the color-converting part to focus solely on wavelength conversion while the reflective layer handles light distribution, simplifying the overall structure and reducing manufacturing complexity
3Use of energy by moving object
If the color-converting part is made thicker to improve conversion efficiency, then wavelength conversion is improved, but light absorption by the color filter increases
Solution Approach 1:
The patent ensures continuous useful action of light by reflecting light that passes through the color-converting part back through it again. This allows the light to undergo wavelength conversion multiple times, maintaining high conversion efficiency while preventing energy loss through the color filter, as the reflected light is continuously reused
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
This configuration improves light efficiency by reflecting and reusing light that would otherwise be absorbed, reducing the need for scattering particles and allowing for a thinner color-converting part and less dye or pigment in the color filter, thus enhancing the display device's performance.
Implementation Method 1
a light-reflective layer disposed between the color-converting part and the color filter pattern to selectively reflect a light having a wavelength same as the wavelength of the incident light
Implementation Method 2
a color-converting part including a wavelength-converting particle configured to change a wavelength of an incident light to emit a light having a color different from the incident light
Implementation Method 3
a color filter pattern filtering the light emitted from the color-converting part
Data Source
AI summary
A color-converting substrate includes a color-converting part including a wavelength-converting particle configured to change a wavelength of an incident light to emit a light having a color different from the incident light, a color filter pattern filtering the light emitted from the color-converting part, and a light-reflective layer disposed between the color-converting part and the color filter pattern to selectively reflect a light having a wavelength same as the wavelength of the incident light.