HMD Image Correction via Head-Motion Synchronized Pixel Shift
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Solution Overview
Problem
Head-mounted display devices experience image shake and pixel deterioration due to their proximity to the user's eyes, leading to issues like motion sickness and nausea, as existing pixel shift techniques are not effective in preventing afterimages and deterioration without recognizing image shifts to the user.
Innovation Solution
A head-mounted display device that includes a motion tracker, image corrector, data driver, and scan driver, which shifts entire image data based on the user's head movement, adjusting the shift amount and direction according to the rotation angle, thereby preventing pixel deterioration and afterimages without recognizing the image shift to the user.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pixel shift operation is performed to prevent afterimage and pixel deterioration, then pixel deterioration and afterimage are reduced, but image shake is visually recognized causing motion sickness and nausea
Solution Approach 1:
The patent applies dynamics by making the pixel shift operation adaptive to head movements. The system continuously adjusts the shift amount and direction based on real-time head position data from the motion tracker, transforming the static pixel shift into a dynamic correction that compensates for head motion. This resolves the contradiction by making the pixel shift invisible to the user while maintaining its protective effect against pixel deterioration.
Solution Approach 2:
The patent implements feedback through the motion tracker that continuously monitors head movement and feeds this information back to the image corrector. The image corrector uses this feedback to adjust pixel shift parameters in real-time, creating a closed-loop system. This feedback mechanism ensures that pixel shifts are performed only when necessary and in the correct direction, preventing visible image shake while maintaining pixel protection.
2Device complexity
If pixel shift is performed without head movement tracking, then implementation is simple, but image shake is visually recognized and causes discomfort
Solution Approach 1:
The patent applies universality by making the motion tracker and image corrector serve multiple functions. The motion tracker not only tracks head movement for pixel shift correction but also provides data for display timing adjustments. The image corrector handles both pixel shift operations and coordinate transformation. This multi-functionality reduces overall system complexity while achieving effective pixel shift without visible image shake.
3Reliability
If pixel shift is performed continuously, then pixel deterioration is prevented, but user comfort is reduced due to visible image movement
Solution Approach 1:
The patent applies periodic action by performing pixel shift operations at specific intervals triggered by head movement detection, rather than continuously. The motion tracker detects head movement events and triggers pixel shift only when necessary. This periodic approach prevents pixel deterioration through regular maintenance while maintaining user comfort by avoiding unnecessary continuous adjustments.
Data Source
AI summary
A head mounted display device includes a head mounted display panel, a motion tracker which tracks a movement of the head mounted display panel according to a head movement of a user and outputs sensing data, an image corrector which shifts and outputs entire image data based on the sensing data when the head mounted display panel rotates, a data driver which converts the entire image data output from the image corrector into a data signal and provides the data signal to the head mounted display panel, and a scan driver which provides a scan signal to the head mounted display panel.