Liquid Crystal Display Device Luminance Preservation
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Solution Overview
Problem
Conventional liquid crystal display devices experience degraded display quality due to lower luminance when multiple overlapping display panels are used, resulting from m pixel-by-m pixel smoothing processing.
Innovation Solution
A liquid crystal display device comprising a first and second display panel, with an image processor that performs differential filtering, multiplies image data by a correction coefficient, and applies smoothing processing using a mean filter with a normal distribution to maintain peak luminance and improve grayscale distribution, thereby enhancing display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If m pixel-by-m pixel smoothing processing is performed on video signal for rear-side display panel, then display defects caused by parallax are reduced, but luminance corresponding to image data is lowered and display quality is degraded
Solution Approach 1:
The patent applies different processing strategies to different regions of the image data. High-luminance regions (peaks) are preserved without smoothing to maintain brightness, while low-luminance regions undergo smoothing processing to reduce parallax defects. This local differentiation resolves the contradiction by protecting luminance where it matters most while still applying smoothing where it benefits display quality.
Solution Approach 2:
The patent dynamically adjusts the smoothing intensity based on luminance parameters. By detecting peak luminance values and modifying the smoothing coefficient accordingly, the system reduces smoothing strength in high-luminance areas and maintains or increases it in low-luminance areas. This parameter adaptation allows the system to minimize luminance loss while still achieving parallax defect reduction.
2Reliability
If two display panels overlap with color image on front-side and black-and-white image on rear-side, then contrast is improved, but luminance degradation occurs due to smoothing processing
Solution Approach 1:
The patent preserves peak luminance values in the black-and-white image data while applying smoothing only to non-peak regions. This ensures that the high-contrast areas maintain their brightness and visual impact, while still benefiting from parallax defect reduction in the surrounding areas. The local quality principle allows the system to maintain contrast improvement without the associated luminance penalty.
Solution Approach 2:
Instead of applying full smoothing processing to all image data, the patent applies smoothing selectively and partially - only to regions that are not peak luminance areas. This partial action approach achieves sufficient parallax defect reduction without the excessive smoothing that would cause luminance degradation, thereby maintaining both contrast improvement and luminance quality.
Data Source
AI summary
A liquid crystal display device includes: a first display panel displaying a first image; a second display panel displaying a second image; and an image processor generating first and second image data based on input video signal. The image processor includes a first differential filtering processor, a multiplier that multiplies a grayscale of the image data subjected to the differential filtering by the first differential filtering processor by a correction coefficient, and a first smoothing processor that performs smoothing processing on image data obtained by adding the image data multiplied by the correction coefficient and the image data based on the input video signal. The image processor generates the first image data based on the image data based on the input video signal and the image data subjected to the smoothing processing, and generates the second image data based on the image data subjected to the smoothing processing.