Asymmetric Mirror Segmentation for Multi-Directional Light Modulation
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Solution Overview
Problem
Existing projection display devices face difficulties in simultaneously modulating multiple light-source light beams emitted from different directions due to the limitations of digital micromirror devices, where mirrors have the same turn-on and turn-off positions, leading to interference and color breakup issues.
Innovation Solution
A projection display device with an electrooptical device that includes two mirrors and their respective driving elements, allowing each mirror to swing in a different direction to modulate light-source light beams from distinct irradiation directions, preventing interference by controlling their positions between turn-on and turn-off positions, and utilizing a light-source unit that emits light beams of different wavelengths to prevent color breakup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple light-source light beams are emitted from different directions, then the ability to modulate various types of light beams is improved, but interference between light beams reflected by adjacent mirrors occurs
Solution Approach 1:
The patent divides the electrooptical device into multiple independent mirror units (first mirrors and second mirrors), each capable of independently receiving light beams from different directions. This segmentation allows each mirror to process its specific light beam without interfering with others, while collectively enabling the system to modulate multiple types of light beams simultaneously
Solution Approach 2:
The patent employs asymmetric mirror configurations where first mirrors and second mirrors are arranged with different orientations and receiving directions. The first mirrors receive light from a first direction while second mirrors receive light from a second direction, creating asymmetric light paths that prevent interference between adjacent mirrors while maintaining the ability to modulate various light beam types
2Device complexity
If mirrors have the same turn-on and turn-off positions, then the device structure is simplified, but simultaneously modulating multiple light beams from different directions becomes difficult
Solution Approach 1:
The patent segments the mirror system into first mirrors with first driving elements and second mirrors with second driving elements. Each segment can independently control its mirror's position, allowing different mirrors to have different turn-on and turn-off positions. This segmentation enables simultaneous modulation of multiple light beams from different directions while maintaining manageable device complexity through modular design
Solution Approach 2:
The patent introduces dynamic control mechanisms where first driving elements and second driving elements independently control the positions of first mirrors and second mirrors respectively. This dynamic control allows the mirrors to switch between different positions (turn-on and turn-off) at different timings and in different directions, enabling simultaneous modulation of multiple light beams while maintaining operational simplicity through automated control
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 simultaneous modulation of light-source light beams from different directions, reducing interference and preventing color breakup in projected images by ensuring that light beams are reflected in non-overlapping directions and cycled at different timings, resulting in improved image quality.
Implementation Method 1
the first mirror reflects the first light-source light beam in an ON-direction toward the optical projection system
Implementation Method 2
the second mirror reflects the second light-source light beam in the ON-direction toward the optical projection system
Data Source
AI summary
An electrooptical device of a projection display device includes a first driving element and a second driving element. The first driving element switches a position of a first mirror between a first turn-on position, in which the first mirror reflects a first light-source light beam from a first irradiation direction in an ON-direction, and a first turn-off position, in which the first mirror reflects the first light-source light beam in a first OFF-direction. The second driving element switches a position of a second mirror between a second turn-on position, in which the second mirror reflects a second light-source light beam in the ON-direction, and a second turn-off position, in which the second mirror reflects the second light-source light beam in a second OFF-direction.