Ferroelectric Liquid Crystal Drive Circuit Temperature Compensation
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Solution Overview
Problem
Ferroelectric liquid crystal panels face challenges in maintaining high response speed and optimal switching angle across a wide temperature range, as their performance is temperature-dependent, leading to fluctuations in contrast ratio and response speed, and orientation deformation issues at high temperatures.
Innovation Solution
A liquid crystal apparatus with a ferroelectric liquid crystal panel, a drive circuit, a waveform generation circuit, and a control circuit that adjusts the driving voltage based on temperature measurements to stabilize response speed and switching angle, using a table of voltage values to ensure optimal performance across varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high driving voltage is applied to increase response speed, then response speed is improved, but switching angle deviates from optimal value and contrast ratio deteriorates
Solution Approach 1:
The patent applies dynamics by making the driving voltage adjustable and adaptable to temperature conditions. The control circuit dynamically selects from multiple voltage values stored in a table, allowing the system to optimize both response speed and switching angle based on real-time temperature measurements. This resolves the contradiction by enabling voltage to be high enough for fast response while maintaining the correct switching angle through temperature-based compensation.
Solution Approach 2:
The patent changes the parameter of driving voltage based on temperature conditions. By storing multiple voltage values in a table corresponding to different temperature ranges and selecting the appropriate voltage based on measured temperature, the system maintains optimal switching angle (45 degrees) across varying temperatures while ensuring sufficiently fast response speed. This parameter adaptation resolves the contradiction between speed and precision.
2Manufacturing precision
If driving voltage is increased to maintain switching angle at low temperature, then switching angle is improved, but response speed becomes slow
Solution Approach 1:
The system dynamically adjusts driving voltage based on temperature measurements. At low temperatures where higher voltage is needed to maintain switching angle, the control circuit selects the appropriate higher voltage value from the stored table. This dynamic adjustment ensures that the system maintains optimal switching angle precision while compensating for the naturally slower response speed at low temperatures.
Solution Approach 2:
The patent changes the driving voltage parameter according to temperature conditions. By storing multiple voltage values corresponding to different temperature ranges and selecting based on measured temperature, the system ensures that at low temperatures the higher voltage maintains the 45-degree switching angle while accepting the trade-off of slower response speed, which is unavoidable at low temperatures.
3Speed
If high driving voltage is applied to achieve fast response speed, then response speed is improved, but orientation deformation occurs at high temperature
Solution Approach 1:
The patent changes the driving voltage parameter based on temperature to prevent orientation deformation. By storing multiple voltage values corresponding to different temperature ranges and selecting the appropriate voltage based on measured temperature, the system applies lower voltage at high temperatures to prevent orientation deformation while maintaining sufficiently fast response speed, thus resolving the contradiction between speed and reliability.
4Adaptability or versatility
If temperature range is expanded, then adaptability is improved, but performance stability deteriorates due to temperature-dependent fluctuations
Solution Approach 1:
The patent applies feedback by measuring the temperature and using this information to select the appropriate driving voltage from a stored table. The temperature sensor provides feedback about the current thermal conditions, and the control circuit uses this feedback to adjust the driving voltage accordingly. This feedback mechanism maintains performance stability across a wide temperature range by compensating for temperature-dependent fluctuations in response speed and switching angle.
Solution Approach 2:
The patent changes the driving voltage parameter according to temperature conditions to maintain performance stability. By storing multiple voltage values corresponding to different temperature ranges and selecting based on measured temperature, the system expands its operational temperature range while maintaining stable performance characteristics including response speed and switching angle.
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 apparatus achieves stable and optimal response speed and switching angle performance across a wide temperature range, preventing orientation deformation and ensuring uniform switching operations without excessive voltage application.
Implementation Method 1
ferroelectric liquid crystal panel that uses a ferroelectric liquid crystal... transition between the first state and the second state of the molecular long axis direction of the ferroelectric liquid crystal occurs by an application of a given voltage to the ferroelectric liquid crystal
Implementation Method 2
polarizing films 101a, 101b according to crossed nicols... molecular long axis direction during a first state (arrow E) or the polarization axis C of the polarizing film 101a are substantially parallel
Data Source
AI summary
A drive circuit has a ferroelectric liquid crystal panel that operates at a given switching angle and response speed, a sensor that measures temperature, a drive circuit that supplies driving voltage to the ferroelectric liquid crystal panel, a waveform generation circuit that supplies a waveform signal to the drive circuit, and a control circuit that controls the waveform generation circuit; and in a first frame of the driving voltage, outputs during a first interval, a first voltage that is positive and outputs during a second interval that is longer than the first interval, a second voltage that is positive, and in a second frame, outputs during the first interval, the first voltage that is negative and outputs during the second interval that is longer than the first interval, the second voltage that is negative. The control circuit varies the first voltage and the second voltage according to the measured temperature.