Stereoscopic Display Optics Adjustment With Stop Position Correction
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Solution Overview
Problem
Existing video display apparatuses experience unnatural adjustment shifts in visibility due to fixed focal positions for left and right eyes, leading to a feeling of strangeness during stereoscopic viewing.
Innovation Solution
A video display apparatus with a movement drive unit that adjusts the relative positions of the video display unit and optical elements, determining a stop index position based on user input and correcting for inevitable delays or overruns to set precise relative positions, using stop index positions adjusted for individual user characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the focal position is fixed for left and right videos on a display screen, then the parallax video display processing can be performed, but an unnatural state and feeling of strangeness occurs during stereoscopic viewing
Solution Approach 1:
The patent applies dynamics by making the focal position adjustable rather than fixed. The optical element's position can be dynamically changed to match the user's actual focal point, allowing the display system to adapt to individual viewing conditions and eliminate the unnatural feeling caused by fixed focal positions.
Solution Approach 2:
The patent changes the parameter of focal position from a fixed value to an adjustable parameter. By allowing the optical element to be positioned at different locations corresponding to the user's actual focal point, the system can optimize viewing comfort for each user while maintaining proper stereoscopic display functionality.
2Ease of operation
If the optical element position is adjusted to match user's actual focal point, then viewing comfort is improved, but adjustment shift occurs due to delay between user operation and actuator response
Solution Approach 1:
The patent applies preliminary action by predicting the user's intended stop position based on the operation start position and expected operation amount, before the user actually completes the adjustment operation. This allows the system to pre-position the optical element at the correct location, compensating for the time delay in actuator response and eliminating adjustment shifts.
Solution Approach 2:
The patent uses feedback by monitoring the user's adjustment operation and using this information to control the actuator. The system detects when the user starts and stops the adjustment operation, and uses this feedback to automatically position the optical element at the correct focal point, compensating for response delays.
3Measurement precision
If the actuator is driven to move the optical element, then the relative position can be changed, but the actuator cannot stop exactly at the target position due to overrun or underrun
Solution Approach 1:
The patent applies preliminary anti-action by driving the actuator in reverse before the user releases the adjustment operation. This reverse driving counteracts the momentum and prevents overrun, allowing the optical element to stop exactly at the target position corresponding to the user's actual focal point without requiring complex control systems.
4Adaptability or versatility
If the stop position is determined by user operation timing, then individual user characteristics can be accommodated, but adjustment shift occurs due to delay between operation and actual stop position
Solution Approach 1:
The patent applies preliminary action by calculating the expected stop index position based on the operation start position and expected operation amount before the user actually stops the adjustment. This allows the system to determine the correct stop position in advance, accommodating individual user characteristics while eliminating adjustment shifts caused by response delays.
Solution Approach 2:
The patent uses feedback by detecting when the user releases the adjustment operation and using this information to determine the actual stop index position. The system combines this feedback with the expected operation amount to accurately identify the user's actual focal point, adapting to individual differences while maintaining precision.
Data Source
AI summary
A video display apparatus includes video display units, optical elements, and movement drive units configured to change relative positions of the video display units and the optical elements, wherein the movement drive units determine a stop index position in accordance with a timing at which a user has performed a stop operation, and sets the relative positions using the stop index position as a target by returning a position to the stop index position from a state in which the position exceeds the stop index position.