Display Color Component Positioning for Head-Mounted Gaze Tracking
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Solution Overview
Problem
In head or helmet-mounted display systems, relative movement between the display and the viewer's gaze can cause false color effects due to the separation of color components, leading to unwanted display artefacts, particularly when space-stabilized images are intended to appear fixed relative to the viewer's line of sight.
Innovation Solution
A method and apparatus that adjust the positioning of color components based on the rate of change in orientation of the display relative to the viewer's gaze, using predetermined relative timings to ensure accurate alignment and reduce color break-up, by determining the necessary adjustments for each color component and outputting their positions to the display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If color images are displayed as a sequence of color component images within an image refresh period, then the display can generate colour images for viewing, but false color effects and unwanted display artefacts occur when there is relative movement of the display and viewer's direction of gaze
Solution Approach 1:
The patent applies preliminary action by calculating and adjusting the positions of color components before they are displayed. The system determines the relative movement between display and viewer gaze, then pre-compensates the position of each color component to account for this movement, ensuring that even when displayed sequentially, the components converge at the correct perceived position on the retina
Solution Approach 2:
The patent implements dynamics by making the display position of color components adaptive and time-varying. Instead of fixed positions, the system continuously adjusts color component positions based on real-time or predicted relative movement data, allowing the display to dynamically compensate for viewer motion and maintain color accuracy during head movements
2Stability of the object's composition
If space-stabilised images are displayed to appear fixed relative to viewer's line of sight, then the images remain stable during head movement, but color components become separated causing regions of false colours
Solution Approach 1:
The patent applies local quality by treating each color component (e.g., red, green, blue) differently in terms of position adjustment. Instead of applying a uniform transformation to all pixels, the system calculates specific position offsets for each color component based on its display timing and the relative movement, ensuring that each color converges at the correct location while maintaining overall image stability
Solution Approach 2:
The system pre-calculates the position adjustments for each color component before display, using predicted relative movement data to determine where each color should be positioned to compensate for upcoming motion, thereby preventing color separation rather than correcting it after the fact
3Ease of manufacture
If color components are displayed at predetermined relative timings, then the display can generate colour images, but the sequential display causes color break-up when relative movement occurs
Solution Approach 1:
The patent applies preliminary action by calculating and adjusting the positions of color components before they are displayed. The system determines the relative movement between display and viewer gaze, then pre-compensates the position of each color component to account for this movement, ensuring that even when displayed sequentially, the components converge at the correct perceived position on the retina
Solution Approach 2:
The patent implements dynamics by making the display position of color components adaptive and time-varying. Instead of fixed positions, the system continuously adjusts color component positions based on real-time or predicted relative movement data, allowing the display to dynamically compensate for viewer motion and maintain color accuracy during head movements
Data Source
AI summary
A method and apparatus are provided for controlling a display device to generate a colour image for viewing by a user on a display, the colour image being formed by one or more colour components each of a colour selected from two or more different colours to be displayed with predetermined relative timings. Received image data define one or more colour components of a feature to be displayed as an element in the colour image. Rate data are received, e.g. from an associated tracker system, indicative of a rate of change in orientation of the display relative to a direction of gaze of an eye of the user. The received rate data are used to determine a position on the display for displaying each of the one or more colour components of the feature including determining any respective adjustment required to a determined position for the colour component according to its respective colour, the received rate data and the predetermined relative timings. The determined position of each of the one or more colour components is output to the display device for display of the colour component at the respective determined position.