Projector Light Source Timing Control for Bright Environment Adaptability
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Solution Overview
Problem
Conventional projectors with synchronized luminescent and color wheels have limited flexibility in setting the allocation angle for the spoke period, restricting the ability to change brightness and color modes, especially in bright environments.
Innovation Solution
A projector system with a light source unit comprising a first light source for the blue wavelength range and a second light source for the green and red wavelength ranges, a timing setting module to adjust the ratio of emission periods, and a light source driving module to control the light sources based on these settings, allowing for various color modes by changing the ratio of blue and green light periods during the spoke period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the luminescent wheel device and the color wheel device are driven in synchronism with each other, then the projector can operate stably, but the degree of freedom in setting the allocation angle for the spoke period is limited
Solution Approach 1:
The patent divides the light source unit into multiple independent light sources (first light source emitting blue light, second light source emitting green light, third light source emitting red light) that can be controlled independently. This segmentation allows each light source to be driven according to different timing settings, enabling flexible adjustment of the spoke period allocation angle while maintaining stable operation through coordinated control of all light sources.
2Device complexity
If the allocation angle for the spoke period is fixed, then the system structure is simple, but the ability to change brightness and color modes is restricted
Solution Approach 1:
The patent implements dynamic control of the light source timing by introducing a timing setting module that can adjust the spoke period allocation angle and the ratio of emission periods for different light sources. This dynamic adjustment capability allows the system to switch between different color modes (such as brightness-stressed mode and coloring-stressed mode) without requiring physical structural changes, thereby maintaining simple system structure while achieving high adaptability.
3Device complexity
If the ratio of emission periods for different light sources is fixed, then the control system is simple, but the flexibility in setting color modes is limited
Solution Approach 1:
The patent employs parameter changes by allowing the timing setting module to dynamically adjust the ratio of emission periods for different light sources within the spoke period. By changing the duty cycle ratios of blue, green, and red light sources independently, the system can achieve various color modes and brightness levels without complicating the control system architecture, as it only requires modifying temporal parameters rather than adding hardware components.
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 improved flexibility in allocating angles for colors and enhancing brightness and color modes, even with limited degree of freedom in setting the spoke period, thereby improving the projector's ability to project clear images in bright conditions.
Implementation Method 1
a light source unit including a first light source configured to emit light in a first wavelength range and a second light source configured to emit light in a second wavelength range
Implementation Method 2
a luminescent wheel device having a transmission section, which is configured to transmit diffusely light having a wavelength in the blue wavelength range or simply light in the blue wavelength range emitted from an excitation light shining device
Data Source
AI summary
A projector of the present invention includes a light source unit including a first light source emitting light in a first wavelength range and a second light source emitting light in a second wavelength range, a display device for forming image light, a projection optical system for projecting the image light onto a projection target, a timing setting module for changing a ratio of a period shining light in the first wavelength range to a period shining light in the second wavelength range in a spoke period having a plane period emitting light in the first or second wavelength range and a color mixing period emitting both lights in the first and second wavelength ranges for each of a plurality of color modes, and alight source driving module for driving the light source unit based on a setting at the timing setting module.