Liquid Crystal Display Panel Response Synchronization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal display devices with multiple panels suffer from image quality degradation due to differences in response speed between panels, leading to issues like flicker and luminance unevenness in moving images.
Innovation Solution
A liquid crystal display device configuration that includes a first liquid crystal panel and a second liquid crystal panel superposed on each other, with an image processor that performs parallax reduction, temporal filtering, and correction processing to synchronize the response speeds and generate optimized output signals for each panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple liquid crystal panels are overlaid to improve contrast ratio, then contrast ratio is improved, but image quality is reduced due to response speed differences
Solution Approach 1:
The patent applies preliminary action by performing parallax reduction processing on the image signal before it is displayed on the multiple liquid crystal panels. The image processing unit pre-processes the image signal to reduce parallax components that would otherwise cause misalignment between panels with different response speeds, thereby preventing image quality degradation while maintaining the high contrast ratio benefit of multi-panel overlay
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the parallax reduction processing parameters based on the specific characteristics of the overlaid panels. The image processing unit modifies image signal parameters to compensate for response speed differences between panels, ensuring that the combined display maintains both high contrast ratio and high image quality without flicker or luminance unevenness
2Device complexity
If panels with different response speeds are used in multi-panel display, then device complexity is reduced, but flicker and luminance unevenness occur in moving images
Solution Approach 1:
The patent introduces an intermediary - the image processing unit with parallax reduction processing - that mediates between the different response speeds of the liquid crystal panels. This intermediary processes the image signals to pre-compensate for the response speed differences, eliminating flicker and luminance unevenness while allowing the use of panels with different characteristics, thus maintaining low device complexity
Data Source
AI summary
A liquid crystal display device includes: first and second liquid crystal panels disposed to be overlapped with each other; a parallax reduction unit that generates the second output image signal by performing smoothing processing on a first signal based on the input image signal; a first temporal filter that generates a first response correction signal determining the first output image signal based on the second output image signal; and a corrector that generates the first output image signal based on at least the first response correction signal and a second signal based on the input image signal. The first temporal filter generates the first response correction signal of a current frame based on the second output image signal of the current frame and the first response correction signal of a previous frame.