Color Filter Array for Display Backlight Spectrum Control
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Solution Overview
Problem
Current display technologies face challenges in achieving high color gamut, particularly in improving the purity of red, green, and blue wavelength bands, which limits their ability to accurately reproduce a wide range of colors.
Innovation Solution
A light emitting apparatus with a color filter layer comprising color filters of at least two colors arranged in an array, where the transmittance of the color filter layer is adjusted to modify the light emission spectrum, enhancing the relative spectral intensity of specific color lights to match a target spectrum, thereby improving the color gamut of display devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional light source is used without color filter layer, then the device structure is simple, but the color gamut is limited and cannot accurately reproduce a wide range of colors
Solution Approach 1:
The color filter layer is divided into multiple color filter elements (red, green, blue) arranged in an array, where each element selectively transmits specific wavelength bands. This segmentation allows independent control of spectral intensity for different colors, enabling accurate reproduction of a wide color gamut while maintaining a relatively simple overall structure.
Solution Approach 2:
Different regions of the color filter layer have different transmittance characteristics. The red color filter element has high transmittance for red light, the green element for green light, and the blue element for blue light. This local differentiation of optical properties enables precise spectral control to achieve high color gamut without requiring complex overall structure.
2Manufacturing precision
If the color filter layer has high transmittance for all colors, then the light intensity is high, but the spectral intensity of specific colors cannot be enhanced to match target spectrum
Solution Approach 1:
Each color filter element is designed with specific transmittance characteristics tailored to its function. The red element has high transmittance for red wavelengths, the green for green wavelengths, and the blue for blue wavelengths. This local optimization allows enhancement of spectral intensity for specific colors while maintaining appropriate light intensity levels.
Solution Approach 2:
The transmittance parameters of the color filter layer are optimized by adjusting the thickness, material composition, and arrangement of the color filter elements. By changing these parameters, the spectral intensity of specific colors can be enhanced to match the target spectrum while maintaining overall light intensity suitable for display applications.
3Ease of manufacture
If the color filter layer uses uniform thickness and material for all colors, then the manufacturing process is simple, but the transmittance cannot be optimized for different wavelength bands
Solution Approach 1:
The color filter layer is segmented into multiple color filter elements (red, green, blue) with different thicknesses and material compositions. Each element is optimized for its specific wavelength band, allowing precise control of transmittance characteristics. This segmentation, while increasing manufacturing complexity slightly, enables significant improvement in wavelength band transmittance optimization.
Solution Approach 2:
Different regions of the color filter layer have different local properties - the red element has specific thickness and material composition optimized for red light transmission, the green element for green light, and the blue element for blue light. This local quality differentiation allows optimal transmittance for each wavelength band while maintaining a systematic manufacturing approach.
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 effectively adjusts the light emission spectrum to enhance the color gamut of display devices, allowing for improved color reproduction by optimizing the transmittance of the color filter layer, thereby achieving a higher color gamut similar to reference spectra.
Implementation Method 1
the color filter layer is configured to have different transmittances to light of the at least two colors in white light emitted by the light source
Data Source
AI summary
A light emitting apparatus, a method of adjusting a light emission spectrum thereof, a backlight module and a liquid crystal display apparatus. The light emitting apparatus includes a light source and a color filter layer on a light exiting side of the light source. The color filter layer includes color filters of at least two colors arranged in an array, and the color filter layer is configured to have different transmissions to light of the at least two colors in white light emitted from the light source.