Filter Device for Projection Apparatus with CIE1931 Chromaticity Control
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Solution Overview
Problem
Conventional filter devices in projection apparatuses produce images with non-smooth gray scales due to the deviation of yellow, magenta, and cyan light points from the triangular area formed by red, green, and blue light in the CIE 1931 chromaticity diagram, leading to deteriorated image quality and unsatisfactory color saturation.
Innovation Solution
A filter device comprising red, green, blue, yellow, magenta, and cyan filter units, where specific wavelength differences between the 50% transmittance points of these units are controlled to keep the points corresponding to yellow, magenta, and cyan light close to or on the edges of the triangle formed by red, green, and blue light, ensuring smoother gray scales and improved image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If yellow, magenta, and cyan filter units are added to enhance color saturation, then color saturation is improved, but the gray scale smoothness deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the transmission characteristics of the yellow, magenta, and cyan filter units. Specifically, it sets the wavelength ranges and transmittance values of these filters to ensure their corresponding light points fall within or near the RGB triangular area in the CIE chromaticity diagram. This parameter optimization allows the filters to enhance color saturation while maintaining smooth gray scale transitions, resolving the contradiction between color saturation and gray scale smoothness.
2Illumination intensity
If yellow, magenta, and cyan light points are positioned outside the RGB triangle area to increase color saturation, then color saturation is enhanced, but image quality deteriorates
Solution Approach 1:
The patent applies local quality by making the yellow, magenta, and cyan filter units have different transmission characteristics tailored to their specific functions. Each filter unit is designed with specific wavelength ranges and transmittance values that ensure its corresponding light point falls within or near the RGB triangular area. This localized optimization of filter properties allows the system to maintain high color saturation while ensuring all color points contribute to smooth gray scale and high image quality.
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 results in a smoother gray scale and better image quality by maintaining the yellow, magenta, and cyan light points near the triangle edges, enhancing color saturation and achieving high-quality images with improved white balance.
Implementation Method 1
a yellow filter unit, a green filter unit, a blue filter unit and a cyan filter unit... filtering incident white light into red light, green light and blue light
Data Source
AI summary
A filter device including a red filter unit, a green filter unit, a blue filter unit and at least one of a yellow filter unit, a cyan filter unit and a magenta filter unit is provided. Red light, green light and blue light are produced when white light passes through the red filter unit, the green filter unit and the blue filter unit. In the CIE1931 color space coordinate, a triangle color space is formed through joining the points representing the red, green and blue light. Moreover, yellow light, magenta light and cyan light are produced when white light passes through the yellow filter unit, the magenta filter unit and the cyan filter unit. In the CIE1931 color space coordinate, the minimum distance from the points representing the yellow, magenta and cyan light to the edge of the triangle is not exceeding in 0.03.