Sub-Pixel Light Resonance Structure for High-Resolution Color Conversion
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Solution Overview
Problem
Current display devices face challenges in achieving high resolution and compactness, particularly in augmented reality (AR) and vehicle head-up display (HUD) applications, due to issues with the size and durability of color conversion layers used in conjunction with light emitting diodes, which affect luminance and color accuracy.
Innovation Solution
The implementation of a display device with a substrate comprising sub-pixels that utilize light resonance structures, including reflective layers and color converters, to enhance luminance and resolution by optimizing light emission modes and minimizing lateral light loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If inorganic phosphor is used for the color conversion layer, then color conversion capability is improved, but the size of the sub-pixel cannot be reduced due to the large size of inorganic phosphor
Solution Approach 1:
The patent extracts the color conversion function from the traditional inorganic phosphor material and implements it through a cavity structure with specific optical resonance properties. The cavity resonates at the emission wavelength of the light-emitting diode, enabling color conversion without requiring large amounts of inorganic phosphor material, thus reducing sub-pixel size while maintaining color conversion capability.
Solution Approach 2:
The patent changes the optical parameters of the sub-pixel structure by introducing a cavity with specific dimensions and refractive index characteristics. This cavity structure modifies the optical resonance conditions to achieve wavelength-selective emission, replacing the material-based color conversion approach with a structure-based optical resonance approach.
2Area of moving object
If organic phosphor or quantum dot is used for the color conversion layer, then sub-pixel size can be reduced, but material properties deform and optical properties deteriorate due to vulnerability to high-energy light
Solution Approach 1:
The patent removes the vulnerable organic phosphor or quantum dot materials from the color conversion layer and replaces them with a cavity structure that achieves color conversion through optical resonance. This eliminates the material degradation issue caused by high-energy light exposure while maintaining the reduced sub-pixel size advantage.
Solution Approach 2:
The patent substitutes the material-based color conversion mechanism (chemical/optical properties of organic phosphor or quantum dots) with a physical structure-based mechanism (optical resonance of the cavity). This structural approach is more resistant to degradation from high-energy light exposure.
3Illumination intensity
If light emitting diode with high luminance is used, then super high resolution is achieved, but lateral light loss occurs and color mixing defects appear
Solution Approach 1:
The patent introduces a cavity structure with specific local optical properties at each sub-pixel location. The cavity resonates at a wavelength corresponding to the emission wavelength of the light-emitting diode, creating a localized optical field that confines and enhances light emission in the vertical direction while suppressing lateral light propagation, thus preventing color mixing between adjacent sub-pixels.
Solution Approach 2:
The patent utilizes the wavelength-selective resonance property of the cavity structure to control the color emission characteristics. The cavity resonates at specific wavelengths determined by its dimensional parameters and refractive index, enabling precise control over the emission spectrum and preventing color mixing defects between different sub-pixels.
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 approach improves luminance and resolution by maximizing light energy transfer and conversion efficiency within the display device, preventing color mixing defects and allowing for a more compact, high-definition display.
Implementation Method 1
a first light resonance structure disposed in the first sub-pixel and configured to emit a first light using a first light resonance mode
Implementation Method 2
a 1-1 reflective layer on the substrate; and a 1-2 reflective layer on the 1-1 reflective layer
Data Source
AI summary
A display device comprises a substrate including a first sub-pixel, a second sub-pixel, and a third sub-pixel, the first sub-pixel, the second sub-pixel, and the third sub-pixel constituting a pixel, a first light resonance structure disposed in the first sub-pixel and configured to emit a first light using a first light resonance mode, a second light resonance structure disposed in the second sub-pixel and configured to emit a second light using a second light resonance mode, and a third light resonance structure disposed in the third sub-pixel and configured to emit a third light using a third light resonance mode.