Dual DMD Control System for Projection Display Brightness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing single-DMD projection display systems suffer from low light source utilization efficiency, resulting in relatively low image brightness due to limited display time for each color, which is not effectively addressed by current technologies.
Innovation Solution
A digital micromirror device control apparatus utilizing two DMD driving circuits to control two digital micromirror devices, allowing for simultaneous processing and display of component data signals for at least three colors, thereby improving image displaying efficiency by increasing the average display time for each color.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single DMD is used for projection display, then the device complexity is reduced, but the light source utilization efficiency and image brightness deteriorate
Solution Approach 1:
The patent divides the single DMD system into two separate DMDs, with each DMD handling specific color channels. The first DMD displays first color component data (e.g., red and green), while the second DMD displays second color component data (e.g., blue and yellow), enabling parallel processing of multiple color signals and doubling the display time per color from 1/3 to 1/2 of the cycle.
Solution Approach 2:
The patent transitions from a single-DMD sequential color display to a dual-DMD parallel color display system. By adding the dimension of multiple DMDs working simultaneously, the system processes multiple color channels in parallel rather than sequentially, thereby improving light source utilization efficiency without proportionally increasing overall system complexity.
2Ease of manufacture
If a single DMD is used for projection display, then the fabrication cost is reduced, but the image brightness and displaying efficiency deteriorate
Solution Approach 1:
The patent segments the color display function across two DMDs, where each DMD is responsible for specific color components. This segmentation allows each DMD to operate at full capacity for its assigned colors, effectively doubling the display time per color and improving image brightness by approximately 80% compared to single-DMD systems.
3Device complexity
If time-sharing display is used for three colors on a single DMD, then the device complexity is reduced, but the average display time per color and image brightness deteriorate
Solution Approach 1:
The patent segments the three-color time-sharing display into two parallel display paths using two DMDs. The first DMD handles first color component data while the second DMD handles second color component data, allowing simultaneous display of multiple colors and increasing the average display time per color from one-third to one-half of the display cycle.
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The invention provides a digital micromirror device control apparatus and a projection display system. The digital micromirror device control apparatus includes a video decoding circuit configured to decode received video data, thereby obtaining component data signals of a plurality of colors; a digital micromirror device driving circuit including a first sub-driving circuit and a second sub-driving circuit. An input end of the first sub-driving circuit is connected to the video decoding circuit, an output end of the first sub-driving circuit is connected to the first digital micromirror device, an input end of the second sub-driving circuit is connected to the video decoding circuit, and an output end of the second sub-driving circuit is connected to a second digital micromirror device. The first sub-driving circuit and the second sub-driving circuit are configured to process component data signals of at least three of the plurality of colors. According to the present invention, an effect of improving image displaying efficiency of the projection display system is achieved.