LCD Driving Data Converter Motion Vector Overshoot
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Solution Overview
Problem
Existing LCD devices suffer from motion blurring due to slow response speed of liquid crystals, leading to degradation in contrast ratio and display quality, despite the use of over-driving apparatuses that attempt to accelerate response speed.
Innovation Solution
An apparatus and method that detects motion vectors in input data to generate overshoot or undershoot along motion boundaries, using a data converter to modulate data and synchronize it with scan pulses, effectively reducing motion blurring by adjusting gray level changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If over-driving apparatus is used to accelerate liquid crystal response speed, then response speed is improved, but motion blurring and contrast ratio degradation occur at image boundaries
Solution Approach 1:
The patent applies different driving strategies to different regions of the display: normal driving for most pixels and over-driving with compensation for boundary pixels. The data driver identifies boundary regions and applies corrected video signals specifically to pixels at image boundaries, while maintaining normal driving for other regions, thus resolving motion blurring locally without affecting overall display performance
Solution Approach 2:
The patent preemptively compensates for the harmful effects of over-driving by adjusting video signals before they reach boundary pixels. The data driver预先 calculates and applies compensation values to prevent contrast ratio degradation and motion blurring before they occur, rather than attempting to correct them after the fact
2Productivity
If liquid crystal response speed is increased through over-driving, then frame rate is improved, but display quality deteriorates due to motion blurring
Solution Approach 1:
The patent selectively applies over-driving compensation only to boundary pixels where motion blurring occurs, while maintaining full frame rate performance for all pixels. This localized approach preserves overall display quality and frame rate productivity without the penalty of widespread quality degradation
Solution Approach 2:
The data driver acts as an intermediary that processes video signals and inserts compensation values at specific pixel locations. This intermediary function allows the system to maintain high frame rate productivity while filtering out the harmful effects of motion blurring at boundaries, thus mediating between speed and quality requirements
Data Source
AI summary
An apparatus and method for driving an LCD device is provided. The apparatus for driving an LCD device comprises an image display unit that includes liquid crystal cells formed in each region defined by a plurality of gate lines and a plurality of data lines. A data driver supplies analog video signals to the respective data lines. A gate driver supplies scan pulses to the respective gate lines. A data converter detects motion vectors from input data and generating modulated data by filtering the input data in accordance with the motion vectors to generate overshoot or undershoot in a boundary along a motion direction. A timing controller aligns the modulated data to supply the aligned data to the data driver and operates the data driver and the gate driver.