LCD Timing Controller Modulation for Rapid Response Speed
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Solution Overview
Problem
LCD devices suffer from low response speed due to the inherent viscosity and elasticity of liquid crystals, leading to motion blurring and degradation in contrast ratio and display quality when displaying moving images.
Innovation Solution
An LCD device and method that includes a timing controller to modulate data input at a first frame frequency for rapid response speed, a gate driver to generate and sequence gate voltages, and a data driver to convert and synchronize data voltages with scan pulses, effectively improving liquid crystal response speed by adjusting voltage application and retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional LCD driving is used, then the liquid crystal cells can maintain stable operation, but the response speed is slow (20-80ms rising time, 20-30ms falling time) causing motion blurring in moving images
Solution Approach 1:
The patent applies preliminary action by pre-charging the liquid crystal cells to a voltage level higher than the final target voltage before the actual frame is displayed. This over-voltage pre-charging allows the liquid crystal molecules to begin their reorientation process earlier and faster, reducing the response time from 20-80ms to under 16.67ms (one frame period), thereby eliminating motion blurring in moving images.
2Speed
If the liquid crystal response time is reduced to match one frame period (16.67ms), then motion blurring is reduced, but the voltage application timing and level control becomes more complex
Solution Approach 1:
The patent employs periodic action through multi-frame driving, where the liquid crystal cells are driven with different voltage patterns across successive frames. Specifically, odd frames use one voltage pattern while even frames use another, creating a periodic driving scheme that achieves fast response while maintaining manageable control complexity through regular, repeating patterns rather than arbitrary complex waveforms.
3Speed
If over-voltage pre-charging is applied to accelerate response, then rising time is reduced, but the voltage management and timing synchronization becomes more challenging
Solution Approach 1:
The patent applies continuity of useful action by maintaining the liquid crystal cells in a continuously charged state across multiple frames, rather than charging and discharging completely between frames. The over-voltage pre-charging is applied continuously in a controlled manner across odd and even frames, ensuring that the liquid crystal molecules are always in the process of reaching their target state without interruption, thereby reducing effective charging time while maintaining continuous display functionality.
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 achieves rapid response speed, reducing motion blurring and enhancing picture quality by ensuring the liquid crystal cells reach desired voltage levels quickly, thereby improving contrast ratio and display quality.
Implementation Method 1
the characteristics of the inherent viscosity and the elasticity of liquid crystal
Implementation Method 2
the characteristics of the inherent viscosity and the elasticity of liquid crystal
Implementation Method 3
VF is a Freederick transition voltage at which liquid crystal molecules start to be inclined
Data Source
AI summary
An LCD device and a method of driving the same are disclosed, to improve a picture quality by realizing a rapid response speed, wherein the LCD device comprises an image display part which includes liquid crystal cells formed in respective regions defined by a plurality of gate and data lines; a timing controller which modulates data inputted according to a first frame frequency to modulation data to realize a rapid response speed of liquid crystal, and outputs the modulation data or data to a second frame frequency; a gate driver which generates gate on voltages under control of the timing controller, and supplies the gate on voltages to the gate lines in sequence; and a data driver which converts the modulation data or data supplied from the timing controller to a data voltage, and supplies the data voltage to the data line in synchronization with the gate on voltage.