Wavelength-Converted Display Optics for Color Mixing Suppression
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Solution Overview
Problem
Current display devices face challenges in achieving improved display quality, particularly in terms of color accuracy and efficiency, due to limitations in wavelength conversion and light management within the display structure.
Innovation Solution
The proposed display device incorporates a base with a light emitting region, a light emitting element, a wavelength conversion pattern, and color filters that include specific absorbing and transmitting colorants to optimize light transmission and absorption, ensuring that light is converted and filtered effectively across different wavelength ranges to enhance color visibility and reduce external light interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a wavelength conversion pattern is used to convert light from one color to another, then color accuracy is improved, but color mixing and unwanted light emission occur reducing display quality
Solution Approach 1:
A light absorbing layer is introduced as an intermediary component between the wavelength conversion pattern and the color filter. This layer selectively absorbs light in specific wavelength ranges, preventing unwanted light emission and color mixing while allowing the wavelength conversion function to operate effectively. The light absorbing layer acts as a mediator that filters out harmful wavelengths before they reach the final display output.
Solution Approach 2:
The color filter is designed with different colorants for different wavelength ranges. The first colorant transmits light in a first wavelength range while the second colorant transmits light in a second wavelength range. This local differentiation of optical properties within the same color filter structure allows precise control over which wavelengths are transmitted and which are blocked, improving color accuracy while preventing color mixing.
2Measurement precision
If color filters with multiple colorants are used to improve color accuracy, then color visibility is improved, but light transmission efficiency decreases
Solution Approach 1:
The wavelength conversion pattern is divided into multiple regions, each containing different wavelength conversion materials that convert light to different colors. The color filter is similarly segmented with different colorant regions corresponding to different wavelength ranges. This segmentation allows each segment to be optimized for its specific function, maximizing light transmission in desired wavelengths while blocking unwanted wavelengths, thus improving both color accuracy and light efficiency.
3Loss of energy
If the display structure is simplified to increase light efficiency, then light transmission is improved, but color accuracy and control over unwanted emission deteriorate
Solution Approach 1:
Multiple functional layers are merged into an integrated structure where the wavelength conversion pattern, color filter, and light absorbing layer work together as a unified system. The wavelength conversion pattern converts blue light to red light, the color filter selectively transmits specific wavelength ranges, and the light absorbing layer absorbs unwanted wavelengths. This merging of multiple optical functions into a single integrated structure achieves high color accuracy while maintaining light efficiency through synergistic operation of the components.
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 color visibility at side viewing angles, increases light efficiency, and extends the lifespan of the display device by minimizing unwanted light emission and color mixing, thereby enhancing overall display quality.
Implementation Method 1
a first wavelength conversion pattern which is disposed on the first light emitting element, overlaps the first light emitting element, and comprises a first wavelength shifter wavelength-converting the light of the first color into light of a second color
Implementation Method 2
the colorant of the second color blocks transmission of the light of the first color and transmits the light of the second color
Implementation Method 3
the first light absorbing colorant absorbs the light in the first overlapping wavelength range
Data Source
AI summary
A display device includes a first light emitting element which overlaps a first light emitting region, and emits first color light, a first wavelength conversion pattern which overlaps the first light emitting element, and wavelength-converts the first color light into a second color light, and a first color filter which overlaps the first wavelength conversion pattern, and includes a first light absorbing colorant and a colorant of the second color, where the colorant of the second color blocks transmission of the first color light and transmits the second color light, where the colorant of the second color transmits light in a first overlapping wavelength range in which a first emission spectrum of the first wavelength conversion pattern overlaps a first light absorption spectrum of the first wavelength conversion pattern, and where the first light absorbing colorant absorbs the light in the first overlapping wavelength range.