Auxiliary Capacitance Wiring Driver for Liquid Crystal Display Response Time
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Solution Overview
Problem
Liquid crystal display devices face long response times when switching between gradations due to small dielectric torque in minimum voltage states, leading to inconsistent display luminance and false impulse displays.
Innovation Solution
A liquid crystal display device with an auxiliary capacitance wiring driver that increases the dielectric torque of liquid crystal molecules by changing the potential of auxiliary capacitance wirings while the backlight is off, allowing for faster image data writing and reduced response time across the entire gradation range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the auxiliary capacitance line is driven during the period when the backlight is turned on, then the display device performs false impulse display, but the display luminance of a pixel after image data is written varies
Solution Approach 1:
The patent applies preliminary action by driving the auxiliary capacitance line during the backlight off period before the actual display period. This preliminary driving prepares the liquid crystal molecules in advance, ensuring they are in the optimal state when the backlight turns on, thus preventing false impulse display and maintaining consistent luminance without varying display brightness.
2Force
If a minimum voltage is applied to the pixel, then the dielectric torque applied to the liquid crystal molecules is small, but the response time of liquid crystal molecules becomes long
Solution Approach 1:
The patent applies preliminary action by applying a preliminary voltage through the auxiliary capacitance line before the main voltage is applied to the pixel. This preliminary voltage generates initial dielectric torque that starts the liquid crystal molecule rotation earlier, so when the main voltage is applied, the molecules are already in motion and can reach their target orientation faster, effectively increasing the dielectric torque and reducing response time.
Solution Approach 2:
The patent changes the voltage parameter by applying an additional voltage through the auxiliary capacitance line. This voltage change creates an enhanced electric field that increases the dielectric torque acting on the liquid crystal molecules, enabling faster response times especially during transitions from low to high gradations where the standard voltage produces insufficient torque.
3Speed
If the potential of the auxiliary capacitance wiring is changed to increase dielectric torque, then the response time is shortened, but the image data writing must be performed in a specific state
Solution Approach 1:
The patent applies preliminary action by changing the potential of the auxiliary capacitance wiring before the scanning signal line drives the image data writing. This timing arrangement ensures that the liquid crystal molecules are already in the optimal state with increased dielectric torque when the image data is written, achieving fast response times while maintaining straightforward operation through proper sequencing of the driving steps.
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 shortens the response time of liquid crystal molecules when transitioning between gradations, averaging response time and preventing luminance changes, thus enhancing the display's performance and user experience.
Implementation Method 1
the auxiliary capacitance wiring driver changes a potential of a first auxiliary capacitance wiring so that dielectric torque of liquid crystal molecules of a first pixel becomes larger
Data Source
AI summary
In a liquid crystal display device, an auxiliary capacitance wiring driver changes a potential of an auxiliary capacitance wiring so that a dielectric torque of liquid crystal molecules of a pixel (PXj) to which a minimum voltage corresponding to a backlight is written becomes larger while the backlight is turned off, and a scanning signal line driver drives a scanning signal line so that image data is written to the pixel in a state in which the potential of the auxiliary capacitance wiring is changed so that the dielectric torque of the liquid crystal molecules of the pixel becomes larger.