Projection Optical System for Multi-Screen Depth Display
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Solution Overview
Problem
Conventional projection type display devices are expensive due to the use of video split devices with prisms, and they lack the ability to display sub-images with a depth feel on multiple screens simultaneously.
Innovation Solution
A projection type display device utilizing a single optical unit with an illumination system, a liquid crystal panel as the image displaying element, and a projection optical system that projects images onto multiple screens without overlapping shadows, allowing for independent image areas on each screen and providing a depth feel by varying the intensity and position of the projected images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a video split device with prism is used to project images to multiple screens, then multiple images can be displayed on multiple screens, but the manufacturing cost becomes expensive
Solution Approach 1:
The patent merges the functions of the video split device and projection optical system into a single integrated projection optical system. The projection optical system directly projects different image areas to different screens without requiring a separate video split device with prisms, thereby reducing manufacturing cost while maintaining the capability to display multiple images on multiple screens
Solution Approach 2:
The projection optical system is designed to perform multiple functions: it projects the first image area to the first screen and the second image area to the second screen simultaneously. This multi-functional design eliminates the need for dedicated video split devices, reducing overall system cost while achieving versatile multi-screen display capability
2Device complexity
If a video split device with prism is used to divide projection light flux, then the structure becomes complex, but the patent achieves a simple structure without such devices
Solution Approach 1:
The patent combines the light division function and projection function into a single projection optical system. The projection optical system inherently divides the projection light flux to different screens through its optical design without requiring additional video split devices with prisms, thereby simplifying the overall structure while maintaining the ability to project to multiple screens
Solution Approach 2:
The patent extracts and eliminates the video split device with prism from the system. By removing this complex component and integrating its light division function directly into the projection optical system, the patent achieves a simpler structure that still accomplishes multi-screen projection
3Adaptability or versatility
If screens are arranged to display multiple images, then the ability to display sub-images with depth feel is improved, but shadow overlap may occur
Solution Approach 1:
The patent applies local quality by assigning different projection characteristics to different image areas. The first image area is projected to the first screen with specific optical parameters, while the second image area is projected to the second screen with different optical parameters. This localized optimization allows sub-images to be displayed with depth feel on the second screen without shadow overlap, as each area is projected with tailored optical properties
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 the display of multiple images on multiple screens with a simple structure and low manufacturing cost, providing a depth feel effect by ensuring that the sub-image on one screen is displayed prominently behind the main image, creating a three-dimensional appearance.
Implementation Method 1
an image displaying element having a first image display area and a second image display area and optically modulating light flux from the light source by the first image display area and the second image display area based on a first video signal and a second video signal
Implementation Method 2
a projection optical system for projecting respective fluxes as projection light flux from an emitting part
Data Source
AI summary
A projection type display device includes a image displaying element having image display areas for displaying a plurality of images respectively, a projection optical system having an emitting part for emitting projection light flux to the image display areas of the image displaying element, and a plurality of screens for displaying projected images by the projection light flux transmitted through the image display areas of the image displaying element. In the projection type display device, the image display areas are formed in respective areas in the image displaying element independent of each other. The projected images on the screens correspond to the image display areas, respectively. Each of the screens is arranged in such a position that the each of the screens is not overlapped with shadows of the other screens which are produced since the projection light flux is emitted from the emitting part to the screens.