Two-Plate Projector Brightness via Segmented Blue Light
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Solution Overview
Problem
The two-plate projector faces a limitation in increasing the display periods for green and red images due to the fixed time period required for displaying a blue image, which restricts the overall brightness of the image.
Innovation Solution
The projector divides the frame period into two display periods, where the first period is used for irradiating image forming elements with blue light and the second period for green and red light, allowing for increased display times for green and red images by reducing the blue image display time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the display period for blue image is increased to improve blue color quality, then the display periods for green and red images must be reduced, but this decreases the overall image brightness
Solution Approach 1:
The invention divides the frame period into multiple sub-periods, further segmenting the time allocation for each color. By introducing intermediate periods and subdividing the blue light display time into multiple shorter intervals, the system can allocate more total time to green and red images while still providing sufficient display time for blue through multiple refreshes, thus resolving the contradiction between blue image quality and overall brightness
Solution Approach 2:
The invention dynamically adjusts the display periods for different colors within each frame based on the relative luminosity requirements. The system optimizes the time allocation by making the blue light display period shorter and dividing it into multiple sub-periods, while extending the green and red light display periods, creating a dynamic time-multiplexed display scheme that adapts to human visual characteristics
2Illumination intensity
If the display periods for green and red images are extended to improve brightness, then the display period for blue image must be reduced, but this degrades blue color quality
Solution Approach 1:
The blue light display period is segmented into multiple sub-periods within the frame. Instead of allocating one long continuous period to blue, the system divides it into several shorter intervals separated by green and red light periods. This segmentation allows the total blue display time to be distributed effectively, maintaining blue image quality while freeing up time for extended green and red display periods that improve overall brightness
Solution Approach 2:
The invention implements a periodic display scheme where blue light is displayed in repeated short intervals rather than a single continuous period. This periodic action with multiple cycles of blue light display within one frame period ensures that blue image quality is maintained through cumulative exposure, while the gaps between blue periods are utilized for extended green and red light display, thereby improving overall image brightness
3Ease of operation
If equal display periods are allocated to all colors, then the system is simple to control, but the image brightness is insufficient due to not optimizing for human eye sensitivity
Solution Approach 1:
The invention changes the time allocation parameters for each color within the frame period based on relative luminosity characteristics. By adjusting the display period lengths for blue, green, and red light according to human eye sensitivity, the system optimizes perceived brightness without requiring complex control mechanisms. The parameter optimization is built into the display timing scheme, maintaining ease of operation while significantly improving image brightness
Solution Approach 2:
The invention optimizes the display strategy by considering the different luminosity characteristics of various colors. It allocates longer display periods to colors with lower relative luminosity (blue) and shorter periods to colors with higher relative luminosity (green and red), creating a color-adapted time-multiplexed display scheme that improves overall perceived brightness while maintaining simple control through predetermined timing patterns
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
This configuration enhances the brightness of the image by extending the display periods for green and red images, while maintaining a reduced blue image display time, thereby improving overall image luminosity.
Implementation Method 1
micromirrors each reflecting light in directions different according to an on-state and an off-state to allow images to be formed by reflected light from the micromirrors in the on-state
Implementation Method 2
wavelength converting layer 203 is partitioned in the circumferential direction into first and second regions. The first region is a phosphor region that includes a yellow phosphor. The second region is a transmission region that transmits at least light in a blue wavelength range. In the first region, yellow fluorescence is emitted from the yellow phosphor having received the excitation light (blue).
Implementation Method 3
a projection lens that projects the images formed on the first and second image forming elements
Data Source
AI summary
A projector that can increase the brightness of an image, includes: first and second image forming elements that each include micromirrors; a projection lens that projects images formed on the first and second image forming elements; and a light source/optical unit that irradiates the first and second image forming elements with first blue light and second blue light in a first display period, and irradiates the first image forming element with the green light and irradiates the second image forming element with the red light in a second display period.