LCD Over-Driving Apparatus for Moving Image Blurring Reduction
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Solution Overview
Problem
Liquid crystal display (LCD) devices suffer from blurring of moving images due to slow response speed of the liquid crystal material, which affects the display quality by causing degradation in contrast ratio.
Innovation Solution
An over-driving apparatus that detects motion in the image data and generates modulated data using a look-up table system to adjust the response speed of the liquid crystal cells, synchronizing the scan signals with the data conversion to prevent blurring by applying appropriate voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional driving method is used, then device complexity is low, but response speed is slow causing moving image blurring
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing over-driving data in a look-up table before actual image display. The motion detection result from the previous frame is used to select appropriate over-driving data in advance, enabling the liquid crystal cells to achieve faster response without adding complex real-time processing circuits. This resolves the contradiction by preparing the necessary data beforehand rather than computing it during the critical display timing.
Solution Approach 2:
The patent introduces an intermediary look-up table that stores pre-computed over-driving data. This intermediary structure mediates between the simple conventional driving method and the desired fast response speed. The look-up table acts as a buffer that contains predetermined voltage adjustment values based on motion detection, allowing the system to achieve fast response without implementing complex real-time calculation hardware.
2Manufacturing precision
If over-driving is applied to improve response speed, then blurring is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies partial action by selectively applying over-driving only to pixels that contain moving objects, as identified by motion detection. The over-driving data is multiplied by the motion detection result, so that stationary pixels receive normal driving signals while moving pixels receive enhanced signals. This selective approach improves display quality for moving images without requiring the entire display system to be manufactured with higher precision specifications.
3Measurement precision
If motion detection and over-driving data processing is added, then moving image quality improves, but device complexity increases
Solution Approach 1:
The patent uses preliminary action by performing motion detection using data from the previous frame before the current frame is displayed. The motion detection result is then used to select pre-prepared over-driving data from the look-up table. This timing arrangement allows motion analysis to be completed in advance, avoiding the need for complex real-time processing circuits during the critical display timing window.
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
The solution effectively reduces blurring of moving images on the LCD screen, improving display quality by enhancing the response speed of liquid crystal cells, thus maintaining better contrast ratios.
Implementation Method 1
liquid crystal display (LCD) devices adjust light transmittance of liquid crystal cells in accordance with an applied video signal to display an image
Data Source
AI summary
An apparatus for driving an LCD device includes an image display unit having liquid crystal cells in respective regions defined by a plurality of gate and data lines; an over-driving apparatus to detect a signal of a moving image based on a source data and to detect modulated data based on the detected signal, the modulated data changes a response speed of a liquid crystal based on the detected signal; a gate driver to supply scan signals to the gate lines; a data driver to convert the modulated data into analog video signals and to supply the analog video signals to the data lines; and a timing controller to align the modulated data and to generate data control signal and gate control signal, the timing controller outputs the aligned data and the data control signal to the data driver and outputs the gate control signal to the gate driver.