Offset Light Valve for Portrait Projection
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Solution Overview
Problem
Conventional projection devices face challenges in efficiently projecting portrait images without sacrificing brightness and resolution, as they often require significant portions of the digital micro-mirror device's effective region to be set to the off-state, leading to reduced utilization and image quality.
Innovation Solution
The projection device includes an illumination system, a light valve, and a projection lens, where the center of the light valve is offset with respect to a reference plane that includes the central axis of the projection lens in the long side direction of the light valve, allowing the image beam to directly form a portrait image without unnecessary offsetting in the short side direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the parts corresponding to non-predetermined projection region are set to off-state to project portrait image, then portrait image can be projected, but the utilization rate of effective region is significantly reduced
Solution Approach 1:
The patent applies asymmetry by offsetting the light valve relative to the projection lens in the long side direction. This asymmetric configuration allows the effective region of the light valve to be fully utilized for portrait image projection without requiring large portions to be set to off-state, thereby resolving the contradiction between portrait projection capability and effective region utilization rate
2Adaptability or versatility
If large portions of effective region are set to off-state, then portrait image projection is achieved, but brightness is reduced
Solution Approach 1:
The asymmetric offset configuration of the light valve enables more of the effective region to remain in the on-state during portrait projection, maintaining higher illumination intensity and brightness while achieving the desired portrait image format
3Adaptability or versatility
If large portions of effective region are set to off-state, then portrait image projection is achieved, but resolution is reduced
Solution Approach 1:
By configuring the light valve with an offset in the long side direction relative to the projection lens, the patent ensures that a larger proportion of the effective region contributes to the portrait image projection, thereby maintaining higher resolution while achieving portrait format output
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 enables the projection device to form portrait images with favorable display quality without compromising brightness and resolution, even when projecting images to specific regions like elevator doors, by maintaining a high utilization rate of the light valve's effective region.
Implementation Method 1
The light valve is disposed on a transmission path of the illumination beam to modulate the illumination beam into an image beam
Implementation Method 2
The projection lens is disposed on a transmission path of the image beam to project the image beam out of the projection device to form a portrait image
Data Source
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AI summary
A projection device includes: an illumination system providing an illumination beam; a light valve disposed on a transmission path of the illumination beam to modulate the illumination beam into an image beam; and a projection lens disposed on a transmission path of the image beam to project the image beam out of the projection device to form a portrait image. A center of the light valve has a first offset relative to a reference plane in a long side direction of the light valve. The reference plane includes a central axis of the projection lens. The reference plane is perpendicular to the long side direction of the light valve. A center of the portrait image has a second offset relative to the reference plane in a long side direction of the portrait image. The projection device of the invention provides a portrait image with favorable display quality.