Stereoscopic Display Optics Alignment Using Corrected Stop Indexing

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Solution Overview

Problem

Existing video display apparatuses experience unnatural adjustment shifts in visibility adjustment due to fixed focal positions for left and right eyes, leading to a feeling of strangeness in stereoscopic viewing.

Innovation Solution

A video display apparatus with a movement drive unit that adjusts the relative positions of video display units and optical elements by setting stop index positions and correcting for delays in user operations, using vibration-type actuators and position detection sensors to minimize visibility shifts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If visibility adjustment is performed by driving an optical element in accordance with individual difference and usage state, then the feeling of strangeness in stereoscopic viewing is reduced, but an adjustment shift occurs in the visibility adjustment

Engineering Contradiction:

Improvevisibility adjustment accuracyVSAvoidadjustment position accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The system performs preliminary action by detecting the stop index position (user's intended stop point) and pre-calculating the corrected stop position that compensates for operational delay. The actuator is then driven to this pre-calculated position, ensuring accurate visibility adjustment despite the time lag between user input and actuator response.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements feedback by detecting the actual stop index position through user operation, calculating the appropriate corrected position based on this feedback, and then driving the actuator to achieve the desired visibility adjustment. This closed-loop approach ensures accuracy despite individual differences in user operation speed.

Inventive Principle:

Principle #23Feedback

2Device complexity

If the focal position is fixed to each of left and right videos on a display screen, then the video display apparatus can be simplified, but an unnatural state is created that cannot be caused in real object viewing

Engineering Contradiction:

Improvefocal position adjustment mechanismVSAvoidstereoscopic viewing naturalness

Core Design Contradiction:

Device complexityVSEase of operation

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 based on user input and individual differences, allowing the system to adapt to different viewing conditions and create a more natural stereoscopic experience while maintaining relative simplicity through controlled adjustability.

Inventive Principle:

Principle #15Dynamics

3Adaptability or versatility

If a stop operation is performed at a timing when the user determines the most appropriate visibility adjustment state, then visibility adjustment can be performed according to user preference, but a position shift occurs from the determined position due to overrun

Engineering Contradiction:

Improveuser-preferred visibility adjustmentVSAvoidstop position accuracy

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system applies preliminary anti-action by calculating a corrected stop position that anticipates and counteracts the overrun effect. Instead of letting the actuator overshoot the detected stop index position, the system pre-adjusts the target position to compensate for the expected delay and inertia, preventing the position shift before it occurs.

Inventive Principle:

Principle #9Preliminary anti-action

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 apparatus effectively prevents adjustment shifts, ensuring clear video display by accurately aligning optical elements with user-defined visibility settings, even accounting for individual differences and operational delays.

Implementation Method 1

the movement drive unit includes a visibility change drive unit that moves the optical element

Methodology Applied

Scientific EffectVibration-type actuator: Ultrasonic Motor

Implementation Method 2

position detection sensors to minimize visibility shifts

Methodology Applied

Scientific EffectPosition detection:

Data Source

PatentEP4671849A1Video display apparatus and adjustment method of the same

Publication Date: 2025.12.31 CANON KK

Figure 1A~1B
Figure 2A~2B
Figure 3

AI summary

A video display apparatus includes video display units 102a, 102b, optical elements 103a, 103b, and movement drive units 12 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.