LCD Driver Motion-Adaptive Grayscale Control for Response Speed
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Solution Overview
Problem
Liquid crystal displays with vertically aligned mode and normally black mode suffer from image quality degradation due to insufficient response when displaying moving images, while maintaining the contrast ratio achieved for still images remains a challenge.
Innovation Solution
A driver device for liquid crystal displays that determines whether a pixel is in a moving image area and adjusts the grayscale level data to prevent darker levels than a predetermined first grayscale level, using hardware or computer programs to implement this functionality, thereby addressing the slow response speed issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If liquid crystal displays use vertically aligned mode and normally black mode to maintain contrast ratio, then the contrast ratio is improved, but the response speed deteriorates causing image quality degradation during moving image display
Solution Approach 1:
The patent applies different grayscale level processing to different regions of the display based on motion detection. For pixels identified as being in moving image areas, the grayscale level is constrained to be no darker than a predetermined first grayscale level, while other pixels maintain normal grayscale processing. This localized quality adjustment resolves the contradiction by improving response speed in moving regions without sacrificing contrast ratio in static regions.
2Manufacturing precision
If the display maintains dark grayscale levels for moving images to preserve image quality, then the image quality is improved, but the response time increases causing motion blurriness
Solution Approach 1:
The patent performs preliminary detection of moving image areas and pre-adjusts grayscale levels before the liquid crystal molecules need to respond. By identifying moving regions in advance and constraining their grayscale levels to be no darker than the first grayscale level, the system prepares the display state proactively, reducing the actual response time required during motion and preventing motion blurriness while maintaining image quality.
3Speed
If grayscale level data is adjusted to improve response speed during moving images, then the response speed is improved, but the grayscale level precision deteriorates
Solution Approach 1:
The patent applies partial action by constraining grayscale levels only in specific moving image regions rather than the entire display. The grayscale level is limited to be no darker than a predetermined first grayscale level in moving areas, while maintaining full grayscale precision in non-moving areas. This partial application of the constraint achieves the necessary response speed improvement without unnecessarily sacrificing grayscale precision where it is not needed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively reduces image quality degradation during moving image display while maintaining the contrast ratio achieved for still images, ensuring improved display quality and natural grayscale levels.
Implementation Method 1
liquid crystal with negative dielectric anisotropy. In the absence of applied voltage, liquid crystal molecules align vertically
Implementation Method 2
the liquid crystal layer has little birefringence (optical anisotropy). Linearly polarized light incident from a polarizer on a liquid crystal layer under these conditions leaves the liquid crystal layer while retaining its polarization
Implementation Method 3
when a voltage is applied, liquid crystal molecules in the liquid crystal layer tilt in accordance with the applied voltage. Linearly polarized light incident from a polarizer on a liquid crystal layer under these conditions develops phase difference in the liquid crystal layer
Data Source
AI summary
There is provided a motion-adaptive grayscale level converter section between a video signal source and a pixel array. The pixel array includes a liquid crystal cell of normally black and vertically aligned mode. The motion-adaptive grayscale level converter section determines based on information from a decoder section whether the pixels of an image represented by a video signal is in a moving image area. If a pixel is in a moving image area, the motion-adaptive grayscale level converter section changes the grayscale level data representing the grayscale level of the pixel so that there is no darker grayscale level than a predetermined first grayscale level. The resultant data is output as a video signal. Accordingly, we can provide a liquid crystal display capable of easing image quality degradation due to insufficient response when displaying a moving image while maintaining the contrast ratio achieved for a still image display.