3D Display Gate Scanning Inversion for Crosstalk Reduction
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Solution Overview
Problem
Three-dimensional image display devices using shutter glasses suffer from a crosstalk phenomenon, where the left and right eye images interfere with each other, particularly in the lower part of the panel, leading to deteriorated display quality due to timing issues in applying voltage during scanning.
Innovation Solution
The solution involves inputting consecutive left and right eye images with opposite gate scanning directions, using over-shoot or under-shoot driving, and controlling the gate scanning based on an inversion signal, along with synchronizing the shutter member's open and closed states with a three-dimensional sync signal to reduce crosstalk and enhance luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If gate scanning is performed in a single direction for consecutive frames, then the scanning process is simple and fast, but the lower part of the panel experiences delayed voltage application and insufficient image output time, causing crosstalk
Solution Approach 1:
The gate scanning direction is periodically inverted between consecutive frames. In odd frames, scanning proceeds from upper to lower gate lines, while in even frames, scanning proceeds from lower to upper gate lines. This periodic inversion ensures that each region of the panel receives timely voltage application in alternating frames, preventing crosstalk while maintaining simple scanning hardware.
Solution Approach 2:
The gate scanning direction is inverted in alternating frames. Instead of always scanning from upper to lower, the system scans from lower to upper in even frames. This inversion compensates for the delayed voltage application in the lower panel region by addressing it first in frames where scanning starts from the lower end.
2Productivity
If voltage is applied quickly to maintain scanning speed, then productivity is high, but the lower part of the panel does not have sufficient time to output the image, generating crosstalk
Solution Approach 1:
The system alternates the scanning direction periodically between frames, allowing the lower panel region to be addressed early in even frames when scanning starts from the lower end. This periodic reversal ensures sufficient voltage application time for image output in all regions without reducing overall scanning speed.
3Loss of time
If the panel scans from upper to lower continuously, then the scanning process is efficient, but the lower part of the panel experiences delayed voltage application timing
Solution Approach 1:
The gate scanning direction is inverted in alternating frames. In odd frames, scanning proceeds from upper to lower gate lines, while in even frames, scanning proceeds from lower to upper gate lines. This inversion compensates for the delayed voltage application in the lower panel region by addressing it first in frames where scanning starts from the lower end.
Solution Approach 2:
The gate scanning direction is periodically inverted between consecutive frames. In odd frames, scanning proceeds from upper to lower gate lines, while in even frames, scanning proceeds from lower to upper gate lines. This periodic inversion ensures that each region of the panel receives timely voltage application in alternating frames, preventing crosstalk while maintaining simple scanning hardware.
Data Source
AI summary
A three dimensional image display device includes a display panel in which at least one of two consecutive left eye images and two consecutive right eye images are inputted, where the two consecutive left eye images are substantially the same as each other, and the two consecutive right eye images are substantially the same as each other, and where gate scanning directions of the two consecutive left eye images are opposite to each other, and gate scanning directions of the two consecutive right eye images are opposite to each other.