Segmented LCD Backlight for VR Latency Reduction
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Solution Overview
Problem
Virtual reality and augmented reality systems experience motion sickness due to latency issues in liquid crystal display (LCD) devices, which are not adequately addressed by existing technologies.
Innovation Solution
The LCD display is segmented into two sections, each with a liquid crystal segment and a backlight unit, where the liquid crystal segment of one section is programmed during a first portion of the frame while the backlight unit of the other section is driven, and vice versa, to reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the LCD display is used in VR/AR systems, then images can be displayed to immerse the user, but latency causes motion sickness
Solution Approach 1:
The LCD display is divided into two independent sections, each with its own liquid crystal segment and backlight unit. This segmentation allows the display to operate in two alternating modes within a single frame period: one section displays the current frame while the other updates, effectively halving the perceived latency and eliminating motion sickness caused by delayed image display.
2Measurement precision
If the liquid crystal segment is programmed during the entire frame period, then the display can show complete images, but latency increases causing motion sickness
Solution Approach 1:
The display operates using periodic alternating action between two sections. During each frame period, Section 1 displays while Section 2 updates, then they switch. This periodic alternation maintains complete image quality in the displaying section while the updating section prepares the next frame, reducing overall latency without compromising image completeness.
3Loss of time
If the display device is divided into two sections with separate backlight units, then latency is reduced, but device complexity increases
Solution Approach 1:
The display is segmented into two independent sections, each with its own liquid crystal segment and backlight unit. This segmentation enables parallel operation where one section displays while the other updates, reducing latency. The modular segmented structure allows for systematic organization that manages the increased complexity through clear functional separation.
Data Source
AI summary
A display device includes a liquid crystal layer and a backlight. The liquid crystal layer includes a first liquid crystal portion including a first plurality of pixels, and a second liquid crystal portion including a second plurality of pixels. The backlight includes a first backlight unit corresponding to the first liquid crystal portion, and a second backlight unit corresponding to the second liquid crystal portion. Each backlight unit includes one or more light sources, and a light guide for guiding light generated by the one or more light sources to a respective liquid crystal portion.