Projection Device Multiple Color Gamut Modes
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Solution Overview
Problem
Projection devices using laser light sources face challenges in accommodating different color gamuts due to fixed wavelength emissions, limiting their ability to satisfy varied display color requirements.
Innovation Solution
A projection device with multiple color gamut modes is achieved by incorporating a light source module with multiple light sources and a control device that adjusts the brightness ratios of red, green, and blue sub-color beams across different time slots to produce primary color beams, allowing the device to switch between color gamut modes such as DCI-P3 and Rec. 709 standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If laser light sources with fixed wavelengths are used to improve projection brightness, then projection brightness is improved, but the display color gamut becomes fixed and cannot satisfy different color gamut requirements
Solution Approach 1:
The patent applies dynamics by making the color gamut adjustable rather than fixed. The system can dynamically switch between different color gamut modes (e.g., DCI-P3, Rec.709, BT.2020) by controlling the brightness ratios of red, green, and blue sub-color beams through pulse width modulation, allowing the projection device to adapt to different display standards while maintaining high brightness from laser sources.
Solution Approach 2:
The patent changes the parameters of the light output by adjusting the brightness ratios of the three primary color beams (red, green, blue) through independent pulse width modulation control. By varying these brightness parameters in different time slots, the system can transform the fixed-wavelength laser output into multiple color gamut modes, resolving the contradiction between fixed wavelength and variable color gamut.
2Adaptability or versatility
If multiple light sources are added to enable multiple color gamut modes, then color gamut adaptability is improved, but device complexity increases
Solution Approach 1:
The patent merges the functions of multiple light sources into a single integrated light source module. Instead of using separate physical light sources for different color gamuts, the system combines red, green, and blue laser or LED sources in one module and controls their brightness ratios through electronic pulse width modulation, achieving multiple color gamut modes without proportionally increasing device complexity.
Solution Approach 2:
The light source module is designed with multi-functionality to support multiple color gamut modes (DCI-P3, Rec.709, BT.2020, etc.) using the same physical hardware. By enabling the module to perform different color gamut functions through software-controlled brightness ratio adjustments, the patent avoids the need for separate dedicated light sources for each color standard, thus limiting the increase in device complexity.
3Measurement precision
If brightness ratios of sub-color beams are adjusted dynamically, then color gamut precision is improved, but control complexity increases
Solution Approach 1:
The patent uses periodic time-division multiplexing to control the brightness ratios of red, green, and blue sub-color beams. Each color beam is emitted in alternating time slots with specific duty cycles, and the human eye's persistence of vision integrates these periodic pulses into perceived continuous colors. This periodic control approach achieves precise color gamut adjustment through simple on/off timing control rather than complex analog dimming circuits.
Solution Approach 2:
The patent replaces complex mechanical or analog brightness control mechanisms with electronic pulse width modulation. Instead of using variable attenuators, neutral density filters, or mechanical apertures to control brightness ratios, the system uses digital electronic control to adjust the duty cycle of each color beam, achieving precise color gamut control with simpler electronic components and better reproducibility.
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 device to dynamically adjust its color gamut to match different display standards, enhancing its capability to project images with varied color gamuts effectively.
Implementation Method 1
more and more projection devices began to directly adopt laser light beams as illumination beams
Implementation Method 2
The light source module at least includes a plurality of light sources configured to provide different color beams
Data Source
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Figure 4~5
AI summary
A projection device (100) and its display method are provided. The projection device (100) includes a light source module (102), a control device (104), a light valve module (106), and a lens module (108). The light source module (102) provides an illumination beam (L) and includes first (110) and second (120) light sources respectively emitting first (111) and second (121) sub-color beams and a driving circuit (140) for driving the first (110) and second (120) light sources. The illumination beam (L) includes the first (111) and second (121) sub-color beams. The light valve module (106) converts the illumination beam (L) to an image beam (IB). The lens module (108) projects the image beam (IB). The projection device (100) is configured to have multiple color gamut modes. In at least partial time of a first time slot, the control device (104) controls the driving circuit (140) to simultaneously drive the first (110) and second (120) light sources.