Portrait Converter OSD Rotation for Projection Displays
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Solution Overview
Problem
In projection video display devices, when converting from a landscape to a portrait screen, the on-screen display (OSD) images are rotated along with the video, making it difficult for users to read menu information, especially in restricted installation environments where portrait projection is desired without changing the device's orientation.
Innovation Solution
A projection video display device with a portrait converter that rotates the video around the optical axis by 90°, accompanied by a projection lens that magnifies and projects the rotated video, and a control system that adjusts the OSD image direction to be readable, either in the same or opposite direction of the video rotation, ensuring the OSD is displayed in a user-friendly orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a portrait converter is used to rotate the video by 90° for portrait projection, then the projection screen can be displayed in portrait orientation, but the OSD image is also rotated making it difficult for users to read menu information
Solution Approach 1:
The patent segments the video signal processing from the OSD signal processing. The portrait converter only processes the video signal to rotate it by 90°, while the OSD signal is processed separately to maintain its original orientation, allowing independent control of each signal type's rotation
Solution Approach 2:
The patent applies different quality characteristics to different parts of the display system. The video portion is rotated to achieve portrait orientation, while the OSD portion maintains its original landscape orientation characteristics, allowing each part to have optimal orientation for its specific function
2Device complexity
If the projection video display device is used in landscape state without change, then the device structure remains simple, but portrait projection cannot be performed in restricted installation environments
Solution Approach 1:
The patent introduces a portrait converter as an intermediary component between the video display element and the projection lens. This mediator rotates the video signal by 90° without requiring changes to the overall device structure or installation orientation, enabling portrait projection while keeping the device in landscape position
Solution Approach 2:
The patent solves the orientation problem by operating in the signal dimension rather than changing the physical device orientation. The portrait converter rotates the video signal in the optical dimension, allowing portrait projection capability without altering the device's physical installation dimension
Data Source
AI summary
A projection video display device includes a projection video display main body (main body) including a light source and a video display element and generating a video to be projected, a portrait converter that rotates the video generated by the main body around an optical axis by 90°, and a projection lens that magnifies and projects the video rotated by the portrait converter. The main body rotates directions of OSD (On Screen Display) images and in the video generated by the video display element to an opposite direction to or in the same direction as a rotation direction of the video by the portrait converter by 90°. Accordingly, the OSD image can be displayed in a direction in which it is easy for the user to see in portrait projection screens.