Projection Display Device Compact Optical Scanning
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Solution Overview
Problem
Existing projection display devices using laser light require large optical path spaces due to horizontal and vertical scanning, resulting in a bulky device with low light use efficiency.
Innovation Solution
A compact projection display device design incorporating semiconductor lasers, collimating lenses, integrator illumination systems, and deflectors to form non-overlapping rectangular illumination regions for each color, allowing for efficient deflection-scanning and high light use efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If optical scanning is performed in both horizontal and vertical directions using polygonal mirror and galvanometer mirror, then complete image scanning is achieved, but device size becomes large and optical path space increases
Solution Approach 1:
The patent extracts the vertical scanning function from the traditional dual-mirror system and reassigns it to the projection lens through vertical displacement mechanism. This removes the need for a separate galvanometer mirror dedicated to vertical scanning, thereby reducing device volume while maintaining complete image scanning capability.
Solution Approach 2:
The projection lens is given dual functionality: it not only focuses the laser beam but also performs vertical scanning through vertical displacement. This multi-functionality eliminates the need for dedicated vertical scanning mirrors, reducing the overall device size while achieving complete optical scanning.
2Ease of operation
If traditional dual-mirror optical scanning system is used, then scanning coverage is complete, but light use efficiency decreases due to multiple reflections and losses
Solution Approach 1:
The patent merges the vertical scanning function with the projection lens function, combining what were previously separate operations into a single optical path. This reduces the number of optical interfaces and reflections, thereby minimizing light loss and improving light use efficiency while maintaining complete scanning coverage.
Solution Approach 2:
By using vertical displacement of the projection lens instead of discrete mirror reflections for vertical scanning, the patent creates a more continuous optical path with fewer interruptions and reflections. This continuous action reduces light loss at each interface while maintaining complete scanning coverage.
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 solution enables a compact projection display device with easy driving control and high light use efficiency by utilizing semiconductor lasers and integrator illumination systems to create non-overlapping color regions, reducing the device size while maintaining effective light projection.
Implementation Method 1
semiconductor lasers, collimating lenses
Implementation Method 2
collimating lenses
Implementation Method 3
integrator illumination systems
Implementation Method 4
deflectors to form non-overlapping rectangular illumination regions
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
A projection display device (1000, 1001, 1002, 1003) includes a plurality of semiconductor lasers (11), a collimating lens (102), an integrator illumination system (INT) , a deflection element (210, 210B, 210G, 210R), a transfer optical system (200, 320), and a projection lens (360). The collimating lens (102) is configured to collimate a plurality of laser beams output from the plurality of semiconductor lasers (11). The integrator illumination system (INT) is configured to overlap the plurality of laser beams collimated by the collimating lens (102) to form a rectangular illumination region (IM1). The deflection element (210,210B, 210G, 210R) is disposed at a position closer to the collimating lens (102) than a position where the rectangular illumination region (IM1) is formed by the integrator illumination system (INT). The transfer optical system (200, 320) is configured to enlarge and transfer the rectangular illumination region (IM1) deflection-scanned by the deflection element (210, 210B, 210G, 210R) to a reflective optical modulation element (340). The projection lens (360) is configured to project video light output from the reflective optical modulation element (340).