Asynchronous Display Control for VR Image Stability
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Solution Overview
Problem
Traditional display driving schemes, such as line-scanning and low-persistence driving, cause 'image broken' and increase cybersickness in VR/AR applications due to synchronous control of display update and light emission, leading to higher display data interface bandwidth and gate scan frequency, which also reduces average brightness.
Innovation Solution
An asynchronous control method where the gate scanning driver scans subpixels at a first rate in a first period of each frame, and the light emitting driver causes subpixels to emit light at a higher second rate in a second period that overlaps the first period, allowing for concurrent display update and light emission without mutual exclusivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional line-scanning driving is used to update display images, then the display can present content, but the upper and lower portions of the display screen present content from different display images causing image broken and cybersickness
Solution Approach 1:
The patent applies preliminary action by completing the entire display image update on the display panel before initiating light emission. The gate scanning driver finishes scanning all subpixels with the new frame data, and only then does the light emitting driver cause the subpixels to emit light. This ensures that the entire image is fully updated before presentation, preventing image broken and cybersickness caused by partial updates during light emission.
2Reliability
If low-persistence driving is used to present each display image only after entire image update, then image broken is prevented, but display data interface bandwidth and gate scan frequency are increased
Solution Approach 1:
The patent merges the display update period and light emission period into a single integrated frame period. Unlike low-persistence driving that uses two subsequent periods (one for update, one for emission), this invention allows the light emission to occur during the same frame period when the image is being updated, with the update completing before emission begins. This consolidation reduces the required bandwidth and scan frequency while maintaining image integrity.
3Reliability
If low-persistence driving is used with two subsequent periods for update and emission, then image broken is avoided, but average brightness of each frame is reduced
Solution Approach 1:
The patent applies continuity of useful action by ensuring that light emission begins immediately after the display update completes within the same frame period, without requiring a separate subsequent period. This continuous transition from update to emission maximizes the utilization of the frame period for both purposes, maintaining image consistency while preserving average brightness by eliminating the temporal separation that would reduce emission duration.
Data Source
AI summary
An apparatus for display includes an active region, a gate scanning driver, and light emitting driver. The active region includes a plurality of subpixels. The gate scanning driver is operatively coupled to the active region and configured to scan the plurality of subpixels in a first period of each frame at a first rate. The light emitting driver is operatively coupled to the active region and configured to cause the plurality of subpixels to start emitting light in a second period of each frame at a second rate. The second rate is higher than the first rate. The second period overlaps the first period.