Superposed LCD Parallax Reduction via Dynamic Filter Gain
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Solution Overview
Problem
Conventional liquid crystal display devices with overlapping display panels suffer from insufficient reduction of display defects due to parallax, as the filter coefficient for low-pass filter processing is determined independently of the background level in input image data.
Innovation Solution
A liquid crystal display device with multiple superposed panels, featuring an image processor that performs differential filter processing, background level detection, and gain determination to adjust the low-pass filter processing based on the detected background level, thereby optimizing the filter gain for reduced parallax-related display defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If low-pass filter processing is performed with a fixed filter coefficient regardless of background level, then the device complexity is reduced, but the display defect due to parallax is insufficiently reduced
Solution Approach 1:
The filter coefficient is changed from a fixed static value to a dynamic value that varies according to the background level of the image. The gain determination circuit dynamically adjusts the filter gain based on detected background levels, allowing the low-pass filter to adapt its processing strength to different image regions and effectively reduce parallax defects while maintaining device complexity at an acceptable level.
Solution Approach 2:
The filter coefficient parameter is modified based on the background level parameter. By detecting different background levels in the image and correspondingly adjusting the filter gain, the system optimizes the low-pass filter processing for different regions, thereby improving parallax defect reduction without requiring a completely complex system architecture.
2Ease of operation
If a simple fixed filter coefficient is used, then the ease of operation is improved, but the manufacturing precision of image processing is insufficient
Solution Approach 1:
The image processing system performs self-adjustment by automatically detecting background levels and determining appropriate filter gains without requiring manual intervention. The gain determination circuit and background level detection circuit work autonomously to optimize the low-pass filter coefficients, achieving high image processing precision while maintaining ease of operation.
Solution Approach 2:
The system implements feedback by detecting the background level of the image and using this information to adjust the filter coefficient. The background level detection circuit provides feedback to the gain determination circuit, which then adjusts the low-pass filter gain accordingly, creating a closed-loop system that achieves high precision image processing while remaining easy to operate.
Data Source
AI summary
A liquid crystal display device having a plurality of display panels disposed in a superposed manner, comprising: a first display panel that displays a first image; a second display panel disposed on a back surface side of the first display panel to display a second image; and an image processor that generates first image data for the first image and second image data for the second image based on the input image data, wherein the image processor includes: a differential filter that performs differential filter processing on a luminance signal calculated from the input image data and outputs a differential detection value; a background level detection circuit that detects a background level using the luminance signal; a gain determination circuit that determines a filter gain using the differential detection value and the background level; and a low-pass filter that performs low-pass filter processing using the filter gain.