Projection System Color Saturation via Yellow Phosphor Modulation
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Solution Overview
Problem
Conventional projection technologies using red, green, and blue primary colors for image modulation result in low color saturation, as human eyes cannot distinguish rapidly changing primary color images effectively.
Innovation Solution
A projection system and image modulation method that utilize a light emitting device emitting colors including a first color, a second color, and a third color, where the third color is a mixture of the first and second colors, with a control device determining gray scale values for each pixel to modulate light through a light valve, enhancing color diversity and saturation by adjusting the duration of color emission based on gray scale values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional triple light valve or single light valve modulation technology using red, green, and blue primary colors is used, then the projection system can display color images, but the color saturation of the displayed image is not high
Solution Approach 1:
The patent changes the color parameters by introducing a third color (yellow) in addition to the traditional red, green, and blue primary colors. The light emitting device emits light of four colors including yellow, and the control device calculates gray scale values for each color channel, thereby improving color saturation through parameter expansion rather than system complexity increase
Solution Approach 2:
The system uses periodic color emission where the light emitting device alternates between different colors (red, green, blue, yellow) in a cyclic manner. The control device controls the duration of color emission based on gray scale values, creating a periodic modulation pattern that enhances color saturation while maintaining manageable system complexity
2Speed
If the image sequence changes rapidly enough for the human eyes to cannot distinguish the primary color images, then the primary color image sequence may be synthesized into a color image by the visual residual phenomenon, but the color saturation remains low
Solution Approach 1:
By adding yellow as a third color to the traditional RGB system, the patent expands the color parameter space. This allows for richer color representation and higher saturation when images are displayed at rapid change speeds, as the visual residual phenomenon combines more color components
Solution Approach 2:
The system employs periodic emission of four colors (red, green, blue, yellow) in sequence, with each color emitted for a duration controlled by its gray scale value. This periodic multi-color emission enhances the visual residual effect, allowing human eyes to synthesize highly saturated color images at high frame rates
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 method improves color diversity and saturation in projected images by effectively modulating light of four different colors, with the yellow phosphor converting efficiency being higher than red, thereby enhancing display quality.
Implementation Method 1
control the light valve to modulate light of corresponding colors emitted from the light emitting device in accordance with the determined gray scale values
Implementation Method 2
the wavelength converting material layer for light of the first color is capable of absorbing excitation light and emits the light of the first color
Data Source
AI summary
A projection system includes a light emitting device, a light valve and a control device. The light emitting device emits light of colors at least including a first color, a second color and a third color, and the third color is a color mixing the first color and the second color. The control device acquires gray scale values corresponding to at least the first color and the second color of each pixel point in an input image, and determines gray scale values corresponding to the first color, the second color and the third color of a corresponding pixel point in a pre-displayed image according to the gray scale values corresponding to the first color and the second color. The present disclosure also provides an image modulation method applied to the projection system.