Liquid Crystal Display Extension Filtering for Black Floating
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Solution Overview
Problem
Conventional liquid crystal display devices with overlapping display panels suffer from degraded display quality in dark regions due to uniform extension filtering, leading to increased luminance and visible black-floating levels.
Innovation Solution
A liquid crystal display device with overlapping panels employs an image processor that performs extension filtering with varying filter sizes based on luminance differences, using a larger filter size for regions with higher luminance differences and a smaller size for those with lower differences, and selects filter sizes from tables associated with different luminance levels to maintain optimal display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform extension filtering is applied to all pixels, then image deviation is prevented when viewed obliquely, but luminance of dark regions increases causing black-floating levels to become visible
Solution Approach 1:
The patent applies different filter sizes to different regions of the image based on luminance characteristics. Specifically, pixels in dark regions use a first filter size while pixels in bright regions use a second filter size, allowing local optimization of filtering parameters to prevent black-floating levels in dark areas while maintaining overall image quality.
Solution Approach 2:
The patent dynamically adjusts the filter size based on the luminance value of each pixel. The image processing unit determines whether to apply a larger or smaller filter size according to the luminance characteristics of the target pixel and its surrounding pixels, making the filtering process adaptive rather than static.
2Productivity
If a fixed filter size is used for extension filtering, then processing is simple and fast, but display quality degrades in regions with varying luminance
Solution Approach 1:
The patent divides the image into different regions based on luminance characteristics and applies appropriate filter sizes to each region. Dark regions use one filter size while bright regions use another, optimizing both processing efficiency and display quality for each specific area.
Solution Approach 2:
The patent changes the filter size parameter based on the luminance characteristics of the image regions. By adjusting this key parameter dynamically according to local luminance conditions, the system achieves both processing efficiency and high display quality across different regions.
Data Source
AI summary
A liquid crystal display device includes: a first display panel displaying a color image, a second display panel that is disposed farther away from the observer with respect to the first display panel and displays a monochrome image, and an image processor that generates color image data and monochrome image data. The image processor includes an extension filtering unit that performs extension filtering on first monochrome image data, which is made monochrome using a maximum value in a value of each color expressing color information included in the input video signal. The extension filtering unit performs the extension filtering on the first monochrome image data using a large filter size in a larger luminance difference region, and performs the extension filtering on the first monochrome image data using a small filter size in a small luminance difference region.