Liquid Crystal Panel Drive Circuit Compensation Unit
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Solution Overview
Problem
Liquid crystal display devices face extended response times due to slow rotational speed of liquid crystal molecules, especially during transitions from black to halftone, resulting in abrupt changes in transmittance and flickering.
Innovation Solution
A liquid crystal panel drive circuit with a compensation unit, including a compensation capacitor and electrical inductor, is used to smooth the drive voltage waveform by controlling the charging and discharging of the compensation capacitor, ensuring a smoother transition and increased rotational speed of liquid crystal molecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the drive voltage is increased to increase the rotational speed of liquid crystal molecules, then the response time is shortened, but the transmittance changes abruptly causing flicker
Solution Approach 1:
The patent applies periodic action by using alternating current drive voltage with specific waveforms (triangle wave, sine wave, or modified sine wave) that periodically vary the voltage magnitude. This periodic voltage application causes the liquid crystal molecules to rotate and return in a controlled manner, achieving both fast response and smooth transmittance transition without abrupt changes that cause flicker.
Solution Approach 2:
The patent changes the voltage parameters (magnitude, waveform shape, duration) of the drive signal to optimize performance. By adjusting the drive voltage waveform from simple square wave to triangle wave, sine wave, or modified sine wave, and by controlling the voltage magnitude within specific ranges, the patent achieves both fast molecular rotation and smooth transmittance transition, resolving the contradiction between speed and flicker.
2Loss of time
If the drive voltage is increased to shorten response time, then the rotational speed increases, but the transition from black to halftone becomes abrupt
Solution Approach 1:
The patent uses periodic drive voltage waveforms (triangle wave, sine wave, or modified sine wave) that naturally provide smooth transitions between voltage levels. This periodic action ensures that liquid crystal molecules rotate at high speed while the transmittance changes gradually, maintaining stability in the transition process and avoiding abrupt changes from black to halftone.
Solution Approach 2:
The patent applies dynamic drive voltage waveforms that adapt the voltage magnitude over time rather than applying a static voltage. The triangle wave, sine wave, and modified sine wave formulations dynamically adjust the voltage during the switching period, enabling fast response while maintaining smooth, controlled transmittance transitions that preserve image quality.
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 shortens response times, prevents abrupt transmittance changes, and enhances the quality of liquid crystal display devices by allowing smoother transitions from black to halftone while increasing the drive voltage.
Implementation Method 1
A liquid crystal panel drive circuit with a compensation unit, including a compensation capacitor and electrical inductor, is used to smooth the drive voltage waveform by controlling the charging and discharging of the compensation capacitor
Implementation Method 2
A liquid crystal panel drive circuit with a compensation unit, including a compensation capacitor and electrical inductor
Implementation Method 3
Liquid crystal material used in a vertical alignment (VA) liquid crystal display device is generally liquid crystal molecule having negative dielectric anisotropy. When an electrical voltage is applied, the liquid crystal molecules start to rotate along a vertical axis
Implementation Method 4
By means of the anisotropy of refraction of liquid crystal molecule, application of electrical voltage to the liquid crystal molecule to redefine refraction anisotropic axis may control the luminance of transmitting light of liquid crystal molecule
Data Source
AI summary
The present invention provides a method for speeding up rotation of liquid crystal molecule and a liquid crystal panel drive circuit used in the method. The method includes providing a liquid crystal display device, which includes a glass substrate having a liquid crystal panel drive circuit formed thereon and including a timing controller and pixel units each including a thin-film transistor, a common electrode, a pixel electrode electrically connected to the thin-film transistor, a compensation unit, and a storage capacitor, the compensation unit including a compensation capacitor, the timing controller being electrically connected to the compensation unit and the pixel electrode; calculating discharging/charging time of the compensation capacitor; activating the liquid crystal display device, where the source driver applies a drive voltage via the thin-film transistor to the pixel electrode; and the timing controller controlling the compensation unit to conduct on or cut off according to the drive voltage.