3D Overlay Disparity Adjustment for Head Tilt in AR Displays

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Solution Overview

Problem

In augmented reality and virtual reality systems, overlay content presented on 3D content can cause depth conflicts and visual discomfort when viewed from different angles due to mismatched disparity axes with the user's head orientation, leading to issues like blurry or double vision.

Innovation Solution

Adjusting the disparity of overlay content based on head pose data, incorporating vertical and horizontal components to compensate for head tilt, thereby reducing the apparent depth gap between overlay and underlying content.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If overlay content is presented with a fixed disparity different from the underlying 3D content, then the overlay content appears closer to the user and avoids depth conflict, but when the user tilts their head the disparity axis no longer matches the user's eyes causing blurry or double vision

Engineering Contradiction:

Improvevisual comfortVSAvoidhead orientation adaptability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent applies dynamics by transforming the static, fixed disparity approach into a dynamic system that continuously adapts overlay disparity based on real-time head orientation data. The playback device dynamically adjusts overlay disparity values in response to detected head movements, ensuring the disparity axis remains aligned with the user's eyes regardless of head tilt, thereby maintaining visual comfort across varying head positions.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements parameter changes by modifying the disparity parameter of overlay content based on detected head orientation. When head tilt is detected, the system changes the disparity values of the overlay content to compensate for the angular mismatch, effectively adjusting the depth perception parameters to maintain proper alignment between the overlay and the user's visual axis.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If overlay content is presented with maximum negative parallax to avoid depth conflict, then the overlay appears closer to the user, but this creates a large apparent depth gap that exacerbates visual discomfort when viewing from angled positions

Engineering Contradiction:

Improvedepth conflict avoidanceVSAvoidvisual discomfort

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies parameter changes by dynamically adjusting the disparity values of overlay content based on detected head orientation. When head tilt is detected, the system modifies the disparity parameters to reduce the apparent depth gap, thereby maintaining depth conflict avoidance while reducing visual discomfort caused by excessive depth separation during angled viewing.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250392690A13D Overlay Disparity with Head Tilt

Publication Date: 2025.12.25 APPLE INC

AI summary

The presentation of overlay content for a 3D scene is adjusted based on head tilt. Image content for a 3D scene is obtained by a head-mounted device. A target depth for the overlay content is determined based on depth information for the content of the scene corresponding to a first disparity. In response to a tilt of the head-mounted device satisfying a correction criterion, an adjusted target depth value for the overlay content is determined, and the disparity of the overlay content is reduced in accordance with the adjusted target depth value. Alternatively, an adjusted vertical disparity and an adjusted horizontal disparity are determined based on the first disparity and the orientation of the head-mounted device, and applied to the overlay content.