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Constant frequency pressure regulating driving method for electronic control dimming medium

A technology of dimming medium and driving method, applied in optics, nonlinear optics, instruments, etc., can solve the problems of uneven gray scale, difficult realization, and complicated operation.

Active Publication Date: 2014-03-26
重庆汉朗精工科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In other words, when realizing a certain gray scale, the three parameters of the voltage amplitude, frequency, and driving time of the voltage signal must be controlled at the same time. The voltage amplitude, frequency, and driving time corresponding to different gray scales are different. In particular, the driving time has a great influence on the gray scale. If the driving time is not enough, it will easily cause the instability of the gray scale and the unevenness of the gray scale. It must last for a certain driving time to achieve the desired gray scale.
[0005] To sum up, the traditional driving method adopted by the electrically controlled dimming medium made of smectic liquid crystal needs to simultaneously control the three parameters of the voltage amplitude, frequency and driving time of the voltage signal applied on the conductive electrode layer, The operation is complicated, the implementation is difficult, and only a limited number of gray scales can be achieved

Method used

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  • Constant frequency pressure regulating driving method for electronic control dimming medium
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  • Constant frequency pressure regulating driving method for electronic control dimming medium

Examples

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no. 1 example

[0038] A pair of sinusoidal AC positive and negative voltage signals with a frequency of 200 Hz, equal voltage amplitude, and opposite phase are respectively applied to the two conductive electrode layers 21 and 22 through the circuit drive control device 40, and the pair of AC positive and negative voltage signals is continuously adjusted. voltage amplitude.

[0039] When the voltage amplitude is 80~250V (fog shading voltage range, see figure 2 At any voltage value in the abscissa), the smectic liquid crystal molecules 31 and the additive molecules 32 all move under the action of the relatively high-voltage alternating electric field formed between the two conductive electrode layers 21 and 22. At this time , the movement of the additive molecules 32 with conductive properties is obviously stronger than that of the smectic liquid crystal molecules 31, therefore, the additive molecules 32 reciprocate, agitate and disrupt the orderly arrangement of the smectic liquid crystal m...

no. 2 example

[0043] A pair of sinusoidal AC positive and negative voltage signals with a frequency of 100 Hz, equal voltage amplitude, and opposite phase are respectively applied to the two conductive electrode layers 21 and 22 through the circuit drive control device 40, and the pair of AC positive and negative voltage signals is continuously adjusted. voltage amplitude.

[0044] When the voltage amplitude is at any voltage value between 60V and 250V (foggy shading voltage range), the smectic liquid crystal molecules 31 and the additive molecules 32 are formed between the two conductive electrode layers 21 and 22. Movement occurs under the action of a high-voltage alternating electric field. At this time, the movement of the additive molecules 32 with conductive properties is obviously stronger than that of the smectic liquid crystal molecules 31. Therefore, the additive molecules 32 reciprocate, stir and disrupt The orderly arrangement of smectic liquid crystal molecules 31 takes less th...

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Abstract

The invention discloses a constant frequency pressure regulating driving method for an electronic control dimming medium. The method comprises the steps that a pair of alternating positive-negative voltage signals which are identical in frequency amplitude and voltage amplitude and opposite in phase are loaded to two conductive electrode layers respectively, the frequency of the alternating positive-negative voltage signals is any frequency within a set frequency range and are unchanged, the voltage amplitude is correspondingly and continuously changed with a set voltage range between 10V and 250V, so that conversion of the electronic control dimming medium among the gray scale states needing to be displayed is achieved in the continuous change process of the voltage amplitude, and the set frequency range is determined by the thickness and the composition of a mixed layer of the electronic control dimming medium. Due to the adoption of the constant frequency pressure regulating driving method, a certain frequency value within the set frequency range is taken by the frequency of the exerted alternating positive-negative voltage signals and the frequency is unchanged so that conversion of the electronic control dimming medium among the gray scale states needing to be displayed can be achieved only through continuous change of the voltage amplitude of the alternating positive-negative voltage signals.

Description

technical field [0001] The invention relates to a driving method of an electronically controlled light-adjusting medium, in particular to a constant-frequency and voltage-regulating driving method applied to an electronically controlled light-adjusting medium made of smectic liquid crystal. Background technique [0002] At present, electronically controlled dimming technology has great application demands in architectural decoration, privacy control, automotive electronics and other fields. As the earliest electronically controlled dimming technology, PDLC mainly mixes nematic liquid crystal molecules and molecular polymers, and controls the alignment state of liquid crystals to generate different refractive indices inside, showing a gap between light transmission and astigmatism. changes in the macro state. Although this technology realizes the function of electronically controlled dimming, it must continue to power on when maintaining the transparent state, and cannot rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1343G02F1/1333
Inventor 田丽于涛孙刚
Owner 重庆汉朗精工科技有限公司