Movable Projection Mirror for Portrait Landscape Switching
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Solution Overview
Problem
Conventional projection display devices face challenges in projecting images smoothly without being bound by the shape of the projection plane or positioning of the projector, leading to issues like partial image extension off the screen and deterioration in picture quality due to the need for large lenses and fixed display types.
Innovation Solution
A projection display device with an illumination optical system, a projection lens unit, and a moving projection mirror unit that can switch between positions to adapt between portrait and landscape display types, allowing for flexible image projection based on the projection plane and audience positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the projection lens diameter is increased and focus length is decreased to shorten throw distance, then the throw distance is reduced, but the projection lens becomes huge in size
Solution Approach 1:
The patent introduces a movable projection mirror unit that can switch between first and second positions, dynamically changing the optical path length. This allows the system to achieve short throw distance when needed without permanently increasing lens size, as the mirror position adjusts the effective optical path rather than requiring a larger lens diameter.
Solution Approach 2:
The patent uses an aspherical mirror to reflect light at a large spread angle from an oblique direction, introducing angular dimension to the projection system. This allows the light to reach the projection plane from a different spatial dimension, enabling short throw distance without requiring a proportionally large lens diameter.
2Adaptability or versatility
If the spread angle of projected light is increased using an aspherical mirror, then the light is less prone to interruption and angle widening is achieved, but the projector size may increase
Solution Approach 1:
The movable projection mirror unit allows the system to dynamically adjust the projection angle and optimize the optical path. By switching between positions, the system can achieve large spread angle for obstacle avoidance while keeping the projector compact, as the mirror's movable design allows efficient light routing without requiring a permanently large optical system.
3Manufacturing precision
If the projector is fixed in position to match a specific display type, then the image can be displayed optimally for that configuration, but the projector cannot adapt to different projection plane shapes or audience positioning
Solution Approach 1:
The patent employs a movable projection mirror unit that can switch between first and second positions to change the projection direction and display orientation. This dynamic adjustment capability allows the same projector to adapt to different projection plane shapes (portrait/landscape) and audience positioning requirements while maintaining optimal image display quality through proper optical path configuration.
Solution Approach 2:
The movable projection mirror unit enables the projector to perform multiple display functions (portrait and landscape modes) with a single device. By switching the mirror position, the system can universally adapt to different projection scenarios without requiring multiple fixed configurations or additional hardware, achieving both precision and versatility.
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 smooth and favorable image projection on variously shaped surfaces without the constraints of projector positioning, maintaining picture quality by switching between display types and optimizing the use of projection optics.
Implementation Method 1
a projection mirror unit for reflecting light from the projection lens unit
Data Source
AI summary
A projection lens unit and a projection mirror unit are moved relative to an illumination optical system, between a first position where an image is projected in a shape that is longer along a direction of projection onto a projection plane and a second position where an image is projected in a shape that is longer along a direction perpendicular to the direction of projection onto the projection plane. When the projection lens unit and the projection mirror unit are located in the first position, a vertically long image is projected onto the projection plane (portrait display). In this state, when the projection lens unit and the projection mirror unit are moved to the second position, a horizontally long image is projected onto the projection plane (landscape display).