Dual LCD Panel Asymmetry for Motion Blur Reduction
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Solution Overview
Problem
Conventional liquid crystal display (LCD) technologies face issues with motion blur due to slow response speed, especially when switching between grayscale levels, and stacking multiple panels exacerbates this problem, leading to decreased in-plane contrast and brightness.
Innovation Solution
A liquid crystal display device comprising a backlight, a first liquid crystal panel, a second liquid crystal panel with lower resolution, and a driver that operates at different refresh rates to compensate for the response speed of the first panel, with the driver adjusting grayscale values in sub-frames to improve contrast and response time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If two liquid crystal panels are stacked together to improve in-plane contrast, then in-plane contrast is improved, but response speed decreases significantly
Solution Approach 1:
The patent divides the display system into two separate liquid crystal panels with different resolutions and refresh rates. The first panel (higher resolution) operates at a lower refresh rate, while the second panel (lower resolution) operates at a higher refresh rate. This segmentation allows each panel to be optimized independently, resolving the contradiction between contrast improvement and response speed maintenance.
Solution Approach 2:
The patent applies different quality characteristics to different parts of the system: the first panel uses high resolution with standard refresh rate for detailed static content, while the second panel uses lower resolution with high refresh rate for motion compensation. This local differentiation allows the high refresh rate to be applied only where needed for motion blur reduction, rather than requiring all pixels to operate at high refresh rates.
2Loss of time
If the refresh rate of the first liquid crystal panel is increased to reduce motion blur, then motion blur is reduced, but power consumption increases and response speed challenges worsen
Solution Approach 1:
The patent applies partial action by using a second panel with lower resolution that operates at high refresh rate to provide motion compensation, rather than requiring the entire high-resolution first panel to operate at high refresh rate. This partial approach reduces power consumption while still achieving motion blur reduction through the combined effect of both panels.
Solution Approach 2:
The patent creates a simplified copy (second panel with lower resolution) that operates at high refresh rate to compensate for motion blur in the high-resolution first panel. This copying approach allows motion compensation without requiring the full high-resolution panel to operate at high refresh rates, thereby reducing power consumption.
3Manufacturing precision
If the second liquid crystal panel has the same resolution as the first panel, then image quality is maintained, but the complexity of the system increases and the benefits of differential refresh rates are reduced
Solution Approach 1:
The patent deliberately creates asymmetry between the two panels by using different resolutions. The first panel has high resolution for detailed content, while the second panel has lower resolution optimized for high refresh rate operation. This asymmetric design reduces system complexity compared to using identical high-resolution panels, while still achieving the desired motion compensation effect.
Data Source
AI summary
A liquid crystal display device includes a backlight, a first liquid crystal panel, a second liquid crystal panel, and a driver. The second liquid crystal panel is overlapped with the first liquid crystal panel, and disposed closer to the backlight than to the first liquid crystal panel. The driver is configured to drive the backlight, the first liquid crystal panel, and the second liquid crystal panel. The second liquid crystal panel is lower in resolution than the first liquid crystal panel. The driver drives the first liquid crystal panel and the second liquid crystal panel at different refresh rates.