Two-DMD Optical Projector Solving Luminance and Cost Trade-offs
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Solution Overview
Problem
Projectors using one chip DLP technology face limitations in luminance efficiency and color saturation due to serial color modulation, leading to color breaking and inability to meet high-level application requirements, while three chip DLP projectors are bulky and costly.
Innovation Solution
An optical projecting apparatus utilizing two digital micro-mirror devices (DMDs) and at least one solid state light source, comprising a first and second solid state light generator, optical module, wavelength-converting module, color-splitting filters, and spatial light modulating module, which splits and converts light beams to achieve improved luminance efficiency and color brilliance while reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If one chip DLP technology is used, then the projector is compact and cost-effective, but luminance efficiency and color saturation are insufficient
Solution Approach 1:
The patent divides the single DMD into two separate DMDs, with each DMD dedicated to specific color channels (e.g., one DMD for red and green, another for blue and yellow). This segmentation allows parallel processing of different color spectra, eliminating the serial modulation bottleneck and significantly improving luminance efficiency while maintaining cost-effectiveness compared to three-chip systems.
2Device complexity
If one chip DLP technology is used, then the projector structure is simple, but color breaking occurs and high-level application requirements are not met
Solution Approach 1:
By segmenting the single DMD into two separate DMDs, each processor can be optimized for specific color ranges, improving color modulation accuracy and eliminating color breaking artifacts. The increased complexity is minimal compared to three-chip systems while delivering superior color performance.
3Illumination intensity
If three chips DLP technology is used, then color breaking and low luminous efficiency are overcome, but the projector becomes bulky and manufacturing cost increases
Solution Approach 1:
The patent merges the functionality of three separate DMDs into two DMDs by strategically assigning color channels to each DMD and using appropriate optical path design. This consolidation achieves the parallel processing benefits of three-chip systems while reducing device complexity, size, and manufacturing cost.
Solution Approach 2:
Each DMD in the two-chip system is designed to handle multiple color channels simultaneously (e.g., one DMD processes both red and green), making each component multi-functional. This universality reduces the total number of components needed while maintaining the parallel processing capability required for high luminance efficiency and color accuracy.
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 apparatus effectively enhances luminance efficiency, color brilliance, and cost-effectiveness by using two DMDs to split and modulate light beams, overcoming the limitations of one and three chip DLP technologies, and maintaining high-level application performance.
Implementation Method 1
the first light beam is converted by the first wavelength-converting module to generate a wavelength-converted light beam
Implementation Method 2
The first color-splitting filter reflects the wavelength-converted light and passes the first light beam through. The second color-splitting filter reflects the second light beam and passes the wavelength-converted light beam through.
Implementation Method 3
The spatial light modulating module is arranged between the optical module and the projecting lens, the spatial light modulating module splits the wavelength-converted light into a third light beam and a fourth light beam
Implementation Method 4
one chip digital light processing (DLP) technology to reduce cost. Projector using one chip DLP technology includes only one digital micro-mirror device (DMD) to modulate image
Data Source
AI summary
An optical projecting apparatus is used for providing a projecting light to a screen via a projecting lens, the optical projecting apparatus and the projecting lens collectively form an optical projecting system. The optical projecting apparatus includes a first solid state light generator generating a first light beam, a second solid state light generator generating a second light beam, a first wavelength-converting module, and a spatial light modulating module. The first wavelength-converting module converts the first light beam into a wavelength-converted light. The spatial light modulating module splits the wavelength-converted light into a third light beam and a fourth light beam, and transmits the second light beam, the third light beam, and the fourth light beam to the screen via the projecting lens.