Flat Panel Display Light Resonating Layer for Brightness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing flat panel displays face challenges in achieving high brightness and external light coupling efficiency due to refractive index differences between layers, leading to significant light loss and image sharpness degradation from total reflection and diffusion of light.
Innovation Solution
A flat panel display design featuring a light resonating layer with alternating low and high refractive index layers, where the thickness of each layer is optimized based on the wavelength of emitted light to minimize reflection and maximize constructive interference, enhancing brightness and external light coupling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-layer light resonating structure is used, then the device complexity is reduced, but the brightness and external light coupling efficiency cannot be maximized due to inability to control different wavelengths optimally
Solution Approach 1:
The light resonating layer is divided into multiple sub-layers (first light resonating sub-layer, second light resonating sub-layer, third light resonating sub-layer) with different thicknesses and refractive indices. Each sub-layer is optimized to resonate with specific wavelengths of light, enabling comprehensive control across the visible spectrum while maintaining manufacturability through systematic design
Solution Approach 2:
Different regions of the light resonating layer have different optical properties - the first sub-layer has thickness of λ/4 for blue light resonance, the second has (2m+1)λ/4 for green light, and the third has λ/2 for red light. This local optimization of optical properties at different positions enables wavelength-specific resonance enhancement while maintaining overall device simplicity
2Loss of energy
If the light resonating layer thickness is increased to improve light coupling, then more light can be extracted, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention optimizes specific parameters of the light resonating layer - the thickness of each sub-layer is precisely controlled to be λ/4, (2m+1)λ/4, or λ/2 depending on the wavelength, and the refractive indices are selected to create appropriate optical contrast. These parameter optimizations enable effective light resonance and extraction without requiring excessive layer thickness or complex multi-layer structures
Solution Approach 2:
The light resonating layer uses composite structure with alternating high and low refractive index materials arranged in specific thickness patterns. This composite design creates constructive interference for light extraction while maintaining a manageable number of layers, balancing light coupling efficiency with manufacturing feasibility
3Ease of manufacture
If conventional single-layer light resonating structure is used, then manufacturing is simpler, but image sharpness degrades due to horizontal light diffusion
Solution Approach 1:
The light resonating layer is segmented into multiple sub-layers with different optical properties, where each sub-layer is optimized to resonate with specific wavelengths. This segmentation enables precise control over light emission characteristics for each color channel, preventing horizontal diffusion and maintaining image sharpness while remaining manufacturable through systematic fabrication processes
Solution Approach 2:
Each sub-layer within the light resonating structure has locally optimized optical properties - different thicknesses (λ/4, (2m+1)λ/4, λ/2) and refractive indices tailored to specific wavelength ranges. This local quality optimization ensures that light is directed perpendicular to the display surface for each color, preventing cross-talk and maintaining sharp image definition
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 optimized light resonating layer structure significantly improves brightness and external light coupling efficiency by focusing horizontally-diffusing light and reducing light loss, while maintaining image sharpness by directing emitted light perpendicular to the display surface.
Implementation Method 1
the thickness of each layer is optimized based on the wavelength of emitted light to minimize reflection and maximize constructive interference
Implementation Method 2
the output coupling efficiency ηout is determined by a total reflection between the respective layers. The total reflection is a phenomenon that light is totally reflected when it advances from a high refractive layer to a low refractive layer at angles above a critical incidence angle
Implementation Method 3
The optimized light resonating layer structure significantly improves brightness and external light coupling efficiency by focusing horizontally-diffusing light
Data Source
AI summary
A flat panel display and a method of manufacturing the same are disclosed. In one embodiment, the manufacturing method includes: i) preparing a substrate, ii) forming a plurality of subpixels on the substrate and iii) forming a light resonating layer including two or more layers on the subpixels, wherein the light resonating layer varies in thickness depending on the subpixels. According to at least one embodiment, it is possible to improve the brightness and the external light coupling efficiency. Further, it is possible to easily manufacture the light resonating layer with the structure in which the low refractive layers alternate with the high refractive layers.