Projection Device Color Gamut Adjustment via Segmented Phosphor
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Solution Overview
Problem
Current projection devices have limited brightness adjustment and a narrow color gamut, which restricts their ability to provide high image quality and energy efficiency, especially in varying ambient conditions and high visual demand scenarios.
Innovation Solution
A projection device with a light source system that includes laser lights of primary colors and fluorescent light of a mixed color, controlled by a device to modulate the color gamut range, allowing for adjustable brightness and energy savings by selectively turning off unnecessary light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If yellow phosphor is used in the Y-segment to improve brightness, then the brightness of emitted light is improved, but the color gamut range becomes very limited
Solution Approach 1:
The color wheel is divided into multiple segments including a Y segment with yellow phosphor, an R segment with red phosphor, and a G segment with green phosphor. This segmentation allows selective excitation of different phosphor regions to achieve different color gamut ranges while maintaining brightness improvement from the yellow phosphor segment.
Solution Approach 2:
The system dynamically adjusts which phosphor segments are excited by controlling the laser light source timing. By selectively turning on/off excitation to different segments (Y, R, G) based on the required color gamut, the system can switch between wide color gamut mode and brightness-optimized mode, making the color gamut adjustable rather than fixed.
2Adaptability or versatility
If red laser light and green laser light are used combined with yellow fluorescent light, then the color gamut is improved, but the cost becomes too high
Solution Approach 1:
Instead of using expensive red and green laser light sources throughout the entire system, the invention applies laser excitation locally and selectively to specific phosphor segments (Y, R, G) on the color wheel. This localized approach allows the system to achieve wide color gamut when needed by exciting appropriate segments, while avoiding the high cost of continuous laser operation or complex laser source assemblies.
Solution Approach 2:
The system uses a single blue laser light source that excites different phosphor segments sequentially as the color wheel rotates, rather than requiring expensive long-lived red and green laser sources. This approach replaces expensive permanent laser sources with a cheaper single laser source combined with phosphor conversion, achieving similar color gamut performance at lower cost.
3Ease of operation
If the color wheel is rotated at 60 Hz with R, G, B regions, then the basic color output is achieved, but the brightness of emitted light is limited and not adjustable
Solution Approach 1:
The system makes the brightness adjustable by dynamically controlling which phosphor segments are excited during color wheel rotation. The control device can adjust the duty cycle and timing of laser excitation to different segments (Y, R, G), enabling continuous brightness adjustment from low to high levels while maintaining basic color output capability through the segmented phosphor structure.
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
Enables the projection of images with a wide color gamut range while optimizing energy usage by adjusting light output based on the required color gamut, improving visual quality and reducing costs.
Implementation Method 1
coating yellow phosphor on the Y segment, the excitation efficiency will be greatly improved since an excitation efficiency of the yellow phosphor is much higher than that of red or green phosphor. When the projection device is in a scenario with high ambient light, it can make the yellow phosphor be excited to generate yellow fluorescent light
Implementation Method 2
A projection device, including: a light source device configured to emit, according to instructions, laser light of a first primary color, laser light of a second primary color, laser light of a third primary color and fluorescent light of a fourth mixed color
Data Source
AI summary
A projection device, comprising a light source device and a control device. The light source device is configured to, according to instructions, emit laser light of first primary color, second primary color, third primary color, and a fourth mixed color fluorescence, respectively. The control device is configured to determine a color gamut range of pixels of an image to be modulated, and transmit the instructions according to the color gamut range to control the light source device to output light required for modulation of the image to be modulated from the laser light of first primary color laser, second primary color, third primary color, and fourth mixed color fluorescence, respectively. The device and method are capable of modulating an image with a wide color gamut, and also save light source energy.