Liquid Crystal Display Pretilt Voltage Control for Response Speed
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Solution Overview
Problem
Conventional liquid crystal display devices have low response speed, which inhibits the effective realization of video images due to the time delay in charging liquid crystal capacitors, especially when the potential difference between target and previous voltages is significant.
Innovation Solution
The implementation of a display device with a first and second image processor, gamma reference voltage generator, data driver, and gate driver, which outputs pretilt voltages to liquid crystals during specific periods, ensuring that both main and sub pixels receive identical pretilt voltages, thereby maintaining consistent charging and improving response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the potential difference between target voltage and previous voltage is great, then the charging time of liquid crystal capacitor increases, but the response speed of liquid crystal decreases
Solution Approach 1:
The patent applies preliminary action by introducing a pretilt period before the main image display period. During this pretilt period, a pretilt voltage is applied to the liquid crystal capacitor to advance the charging process. This ensures that when the main image period begins, the capacitor is already closer to the target voltage, reducing the charging time and improving response speed even when the potential difference is large.
Solution Approach 2:
The patent segments the display timing into two distinct periods: a pretilt period for preliminary charging and a main image period for actual display. This segmentation allows the charging process to be separated from the display process, enabling optimized charging behavior that improves overall response speed without compromising display quality.
2Reliability
If pretilt voltages differ between main and sub pixels, then charging consistency is compromised, but response speed uniformity deteriorates
Solution Approach 1:
The patent applies equipotentiality by ensuring that both main pixels and sub pixels receive the same pretilt voltage during the pretilt period. This equalization of charging conditions ensures uniform response speed across different pixel types while maintaining charging consistency. The gamma reference voltage generator and data driver work together to provide identical pretilt voltages to all pixels regardless of their position or type.
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 approach allows the liquid crystal to be charged with the same voltage in both periods, enhancing the response speed and improving the quality of images displayed by preventing degradation of side viewing angles and gamma curve distortion.
Implementation Method 1
an electric field is applied to a liquid crystal layer and intensity of the electric field is controlled so as to adjust the transmittance of light passing through the liquid crystal layer
Data Source
AI summary
In a display device, a first image processor outputs a first pretilt gray scale in response to a first external image signal during a first pretilt period and a second image processor outputs a second pretilt gray scale higher than the first pretilt gray scale in response to a second external image signal during a second pretilt period. A gamma reference voltage generator outputs a gamma reference voltage. A data driver outputs a first pretilt voltage by converting the first pretilt gray scale into the first pretilt voltage and outputs a second pretilt voltage identical to the first pretilt voltage by converting the second pretilt gray scale into the second pretilt voltage.