Field Sequential Colour Display Image Stability

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Solution Overview

Problem

Field sequential colour displays, particularly in head-mounted display systems, suffer from colour break-up issues due to user head motion, which affects the visibility of colour fields and leads to an unstable image, especially in augmented reality applications.

Innovation Solution

A data processing system that transforms each colour field of a frame based on a predicted view orientation specific to that colour field, allowing for individual transformations to account for the different display times of each colour field, thereby improving image stability and reducing colour break-up.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a field sequential colour display is used to reduce device complexity and cost, then the display can be physically smaller and lower power, but colour break-up occurs due to head motion affecting different colour fields at different times

Engineering Contradiction:

Improvedisplay structureVSAvoidimage stability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The display frame is segmented into multiple colour fields (red, green, blue) that are displayed sequentially rather than simultaneously. Each colour field is transformed individually based on its specific display time and predicted head orientation at that moment, allowing differential compensation for head motion affecting each colour field differently.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system performs preliminary transformation of each colour field before display by predicting the head orientation at the specific time each colour field will be displayed. This advance preparation allows the image to be pre-adjusted to compensate for anticipated head motion, ensuring colour alignment when displayed.

Inventive Principle:

Principle #10Preliminary action

2Device complexity

If traditional single transformation is applied to all colour fields, then processing is simpler, but colour break-up occurs because it cannot account for different display times of each colour field

Engineering Contradiction:

Improvetransformation processingVSAvoidcolour field alignment

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

Each colour field receives a customized transformation based on its local characteristics - specifically, the predicted head orientation at the time that particular colour field will be displayed. This localised approach ensures that each colour field is correctly aligned for its specific display moment, preventing colour break-up.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The transformation parameters for each colour field are dynamically changed based on the predicted head orientation at the specific display time for that colour field. By adjusting these parameters individually for each colour field rather than using a single set of parameters, the system achieves precise colour alignment despite sequential display timing.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11562701B2Data processing systems

Publication Date: 2023.01.24 ARM LTD

AI summary

In a data processing system that includes a field sequential colour display, when displaying a frame that is to be transformed based on a predicted view orientation on the field sequential colour display, each colour field to be displayed on the display for the frame is transformed based on a predicted view orientation for that particular colour field, such that each colour field will be subjected to a different view orientation transformation to the other colour fields for the frame. The so-transformed colour fields are then displayed sequentially on the display to display the frame.