Projection Display Light Adjustment for Multi-Screen Video Joints
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Solution Overview
Problem
Existing projection video display apparatuses struggle to maintain the quality of video joints during multi-screen projection, as the control of light adjusting means is not effectively managed in current technologies, leading to unnatural transitions between projected videos.
Innovation Solution
The apparatus incorporates a variable light adjusting function that allows for multiple display modes, including one where light adjustment is controlled in accordance with external input and another where it is adjusted based on the input video, enabling precise management of light levels to enhance the quality of video joints during multi-screen projections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple projection video display apparatuses are used for multi-screen projection, then the display area is expanded, but the quality of video joints deteriorates due to inconsistent illuminance between adjacent projections
Solution Approach 1:
The patent applies local quality by differentiating the treatment of video regions: the joint regions (peripheral areas near boundaries) receive special illuminance adjustment while the central regions maintain original display characteristics. This allows the system to expand display area through multiple projectors while maintaining video joint quality by locally adjusting only the critical boundary regions where joins occur.
2Stability of the object's composition
If light adjusting means is controlled to improve video joint quality in multi-screen projection, then the uniformity of illumination is improved, but the device complexity increases due to additional control mechanisms
Solution Approach 1:
The patent implements feedback control by having the control unit receive illuminance information from external devices (such as illuminance meters or sensors) and automatically adjust the light adjusting means accordingly. This feedback mechanism enables the system to maintain illumination uniformity across multi-screen projections without requiring complex manual control, as the system self-regulates based on measured illuminance values.
Solution Approach 2:
The system performs self-service by automatically calculating and applying illuminance correction values based on input from external measuring devices. The control unit autonomously determines the appropriate adjustment amounts for each projector's light adjusting means, eliminating the need for manual intervention and reducing operational complexity while maintaining illumination uniformity.
3Stability of the object's composition
If light adjusting means is controlled based on external illuminance information, then the illuminance distribution is improved, but the ease of operation deteriorates due to requirement of external control devices
Solution Approach 1:
The patent introduces an intermediary approach by accepting illuminance information from external devices (such as illuminance meters or sensors) as input to the control unit. These external devices act as mediators that provide objective measurements of the projection environment, enabling the system to automatically adjust illuminance distribution without requiring direct manual operation. The user simply needs to provide or allow the external measuring device, and the system handles the complex adjustment process automatically.
Data Source
AI summary
A projection video display apparatus includes a video input unit, a light source, a display element, a projection optical system, and a variable light adjusting function which changes the amount of light incident on the display element. Display modes using the variable light adjusting function are prepared, and one display mode of the display modes can be selected from a menu screen. Further, the display modes of the display video using the variable light adjusting function includes: a first display mode where the input video is displayed while changing a light adjusting amount in accordance with light adjusting control information, which is input from external equipment and is capable of controlling the variable light adjusting function in unit of frame of a projected video; and a second display mode where the input video is displayed while changing a light adjusting amount in accordance with the input video.