Photoluminescence Display Panel with Low-Index Light Extraction
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Solution Overview
Problem
Display panels face challenges in achieving high luminous efficiency and reducing light attenuation to display realistic, color images effectively.
Innovation Solution
Incorporating a low index of refraction layer between color conversion patterns and color filters, with a refractive index lower than both, along with a light reflection layer to selectively reflect and convert wavelengths, enhancing the efficiency of light conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a color conversion structure is used to convert light wavelength, then desired color light is displayed, but light attenuation increases and luminous efficiency decreases
Solution Approach 1:
A low index of refraction layer is introduced as an intermediary between the color conversion pattern and the color filter. This layer has a refractive index lower than both adjacent layers, creating optical conditions that reduce light attenuation and improve light extraction efficiency, thereby increasing brightness without sacrificing conversion efficiency
Solution Approach 2:
The refractive index parameter is strategically optimized by selecting a low index of refraction layer with a refractive index lower than both the color conversion pattern and the color filter. This parameter change creates favorable optical conditions for light extraction and reduces attenuation, improving overall luminous efficiency
2Measurement precision
If a color filter is used to selectively pass desired color light, then color accuracy is improved, but light transmission efficiency decreases
Solution Approach 1:
The low index of refraction layer serves as an optical intermediary between the color conversion pattern and the color filter, reducing the optical impedance mismatch and improving light transmission through the color filter while maintaining its color selection function
Solution Approach 2:
By changing the refractive index parameter of the intermediate layer to be lower than both adjacent layers, the optical transmission characteristics are improved, allowing more light to pass through the color filter while maintaining color accuracy
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 solution reduces light attenuation and increases the percentage of desired color light transmission, improving luminous efficiency and brightness of the display panel.
Implementation Method 1
a low index of refraction layer having a second refractive index and being disposed between the color conversion pattern and the color filter. The second refractive index being lower than the first refractive index
Implementation Method 2
a color conversion pattern having a first refractive index and configured to convert light provided from the image generating device from one wavelength to another
Implementation Method 3
a light reflection layer disposed between the color conversion pattern and the image generating device and configured to selectively reflect light of a particular range of wavelengths
Data Source
AI summary
A display panel includes: a light emitting device to generate light; a plurality of color conversion patterns including: a first color conversion pattern including first scattering particles dispersed in the first color conversion pattern and configured to scatter the light of the light emitting device; and a second color conversion pattern including second scattering particles dispersed in the second color conversion pattern and configured to scatter the light of the light emitting device; a plurality of color filters including: a first color filter overlapping the first color conversion pattern; and a second color filter overlapping the second color conversion pattern; and a single, low index of refraction layer continuously extending in the surface direction to overlap the first and the second color conversion patterns. The low index of refraction layer has a refractive index lower than refractive indexes of the first and second color conversion patterns.