CN115236914A - A signal converter based on dichroic dye liquid crystal - Google Patents

Abstract

The present invention relates to a signal converter based on dichroic dye liquid crystal, comprising: the liquid crystal display device comprises a liquid crystal box, wherein a liquid crystal mixture is filled in the liquid crystal box, the liquid crystal mixture comprises a dichroic dye and a negative liquid crystal, two end faces of the liquid crystal box are connected with a signal input end used for inputting alternating-current voltage, a black box is arranged on one side of the liquid crystal box, a photoresistor is arranged in the black box, and two ends of the photoresistor are connected with a signal output end used for outputting high level or low level. Compared with the existing converter, the signal converter based on the dichroic dye liquid crystal improves the anti-interference capability and reduces the energy loss.

Description

A signal converter based on dichroic dye liquid crystal

technical field

The invention relates to a signal converter based on a dichroic dye liquid crystal, belonging to the field of optoelectronic information.

Background technique

An analog-to-digital (A/D) converter converts an analog signal (in the form of voltage or current) into a digital signal. The digital signal converted by the signal converter can be operated or used by an instrument, a computer peripheral interface or a microprocessor.

In the existing signal converter scheme, it can be divided into direct A/D converter and indirect A/D converter according to the conversion principle. Among them, the direct A/D converter directly converts the analog signal into a digital signal, such as successive approximation type, parallel comparison type and so on. The successive approximation type A/D converter is easy to be realized by an integrated process, and can achieve higher resolution and speed. Therefore, many integrated A/D chips use the successive approximation type; the indirect A/D converter is the first The analog quantity is converted into an intermediate quantity, and then converted into a digital quantity, such as voltage/time conversion type (integral type), voltage/frequency conversion type, voltage/pulse width conversion type, etc. The integral A/D converter has a simple circuit and strong anti-interference ability. Although it can achieve high resolution, the conversion speed is relatively slow.

The converters in the existing solutions have a rather complicated circuit structure, and since a large number of energy-consuming devices are involved, a large amount of unnecessary energy loss will be generated during use.

SUMMARY OF THE INVENTION

The present invention provides a signal converter based on a dichroic dye liquid crystal, aiming at at least solving one of the technical problems existing in the prior art.

The technical solution of the present invention is a signal converter based on a dichroic dye liquid crystal, which includes: a liquid crystal cell, the liquid crystal cell is filled with a liquid crystal mixture, and the liquid crystal mixture includes a dichroic dye and a negative liquid crystal, so the liquid crystal cell is filled with a liquid crystal mixture. The two ends of the liquid crystal cell are connected with signal input terminals for inputting AC voltage, a black box arranged on one side of the liquid crystal cell, a photoresistor arranged in the black box, and both ends of the photoresistor are connected with Signal output terminal that outputs high or low level.

Further, the liquid crystal cell is a vertical liquid crystal cell, the liquid crystal cell includes a pair of light-transmitting substrates arranged oppositely, the signal input terminal includes a first signal input electrode and a second signal input electrode, and the first signal input electrode and the second signal input electrodes are respectively connected with one end of the surface of the pair of light-transmitting substrates.

Further, the main body of the photoresistor and the main body of the liquid crystal cell are arranged parallel to each other.

Further, the signal output terminal includes a first signal output electrode and a second signal output electrode, wherein the first signal output electrode and the second signal output electrode are connected to both ends of the photoresistor.

Further, a DC power supply is connected in series with the first signal output electrode.

Further, a first resistor is connected in parallel between the first signal output electrode and the second signal output electrode.

Further, the inner surface of the liquid crystal cell is also provided with a vertical alignment agent.

Further, the signal output terminal is arranged outside the liquid crystal cell.

The beneficial effects of the present invention are as follows.

1. The above-mentioned signal converter based on dichroic dye liquid crystal can convert the input analog signal to digital signal at the same time, even if the input signal waveform is not ideal, the device can still change from The information contained in the signal is correctly parsed from the input signal.

2. Compared with the existing signal converter, the signal converter of the present invention has a more concise circuit structure, which reduces the dependence on various energy-consuming devices; The power consumption is an energy-saving device.

Description of drawings

FIG. 1 is a schematic structural diagram of a signal converter based on a dichroic dye liquid crystal according to an embodiment of the present invention.

FIG. 2 is a state schematic diagram of a signal converter based on a dichroic dye liquid crystal when a low voltage is connected according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of a state of a signal converter based on a dichroic dye liquid crystal when a high voltage is connected according to an embodiment of the present invention.

4 is a schematic diagram of corresponding output signal waveforms when different signals are input to the signal converter based on dichroic dye liquid crystal according to an embodiment of the present invention.

Detailed ways

The concept, specific structure and technical effects of the present invention will be clearly and completely described below with reference to the embodiments and the accompanying drawings, so as to fully understand the purpose, solutions and effects of the present invention. It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict.

It should be noted that, unless otherwise specified, when a feature is called "fixed" or "connected" to another feature, it can be directly fixed or connected to another feature, or it can be indirectly fixed or connected to another feature. on a feature. In addition, the descriptions of upper, lower, left, right, top, bottom, etc. used in the present invention are only relative to the mutual positional relationship of each component of the present invention in the accompanying drawings.

Also, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terms used in the specification herein are for the purpose of describing specific embodiments only, and not for the purpose of limiting the present invention. As used herein, the term "and/or" includes any combination of one or more of the associated listed items.

It will be understood that, although the terms first, second, third, etc. may be used in this disclosure to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish elements of the same type from one another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present disclosure.

1 to 4 , in some embodiments, the present invention discloses a signal converter based on dichroic dye liquid crystal, which includes:

Referring to the liquid crystal cell 10 of FIG. 1 , the liquid crystal cell 10 is filled with a liquid crystal mixture, and the liquid crystal mixture includes a dichroic dye 12 and a negative liquid crystal 13 , and the two ends of the liquid crystal cell 10 are connected with an input AC voltage. Signal input terminal 11. The black box 20 arranged on one side of the liquid crystal cell 10 has the function of shielding light. The photoresistor 30 disposed in the black box 20 is connected to both ends of the photoresistor 30 with a signal output terminal 31 for outputting a high level or a low level.

Referring to FIG. 1 , the liquid crystal cell 10 is a vertical liquid crystal cell 10 , and the liquid crystal cell 10 includes a pair of light-transmitting substrates 14 disposed opposite to each other. The signal input terminal 11 includes a first signal input electrode and a second signal input electrode, and the first signal input electrode and the second signal input electrode are respectively connected to one end of the surface of the pair of transparent substrates 14 . The inner surface of the liquid crystal cell 10 is also provided with a vertical alignment agent. Specifically, referring to FIG. 1 , a vertical alignment agent is provided on the inner surface of a pair of substrates disposed opposite to each other, which forms an anchoring effect on the molecules of the liquid crystal mixture, so that the liquid crystal cell is formed. 10 remains transparent when powered down.

When the amplitude of the AC voltage input at the signal input terminal 11 is greater than the threshold voltage of the dichroic dye 12 in the liquid crystal mixture, the liquid crystal cell 10 is in a dark state; when the amplitude of the AC voltage input at the signal input terminal 11 is less than the At the threshold voltage, the liquid crystal cell 10 is in a transparent state. Therefore, the above-mentioned signal converter can dynamically adjust the visible illuminance of the liquid crystal cell 10 according to the change of the input voltage signal, thereby affecting the resistance of the photoresistor 30 in the black box 20, and finally connecting the signal output terminal 31 to output different signals.

The principle of the conversion between the dark state and the transparent state of the liquid crystal cell 10 is as follows: since the liquid crystal mixture contains the negative liquid crystal 13 doped with the dichroic dye 12, the dichroic dye 12 has dichroism, which is in the long axis of the molecule. and the short axis direction of the molecule have different absorption coefficients for polarized light; when the long axis of the dichroic dye 12 molecule is parallel to the polarized light direction, the dichroic dye 12 molecule absorbs light the most; when the dichroic dye 12 molecule When the long axis of is perpendicular to the direction of polarized light, the absorption of light by the dichroic dye 12 molecules is minimal. The liquid crystal molecules of the negative liquid crystal 13 can be rotated under the action of an external voltage, and the rotation of the negative liquid crystal 13 molecules is used to drive the dye to rotate synchronously, thereby changing the coloring and transparent states.

The change of the resistance value of the photoresistor 30 is related to its photoconductive effect. When the liquid crystal cell 10 is in the dark state without light acting on the photoresistor 30, the resistance value of the photoresistor 30 is very high; when the liquid crystal cell 10 is illuminated in the transparent state, the photoresistor 30 resists. value dropped significantly. The stronger the light, the lower the resistance of the photoresistor 30; when the light stops, the photoresistor 30 returns to a high resistance state.

1 , the main body of the photoresistor 30 and the main body of the liquid crystal cell 10 are arranged parallel to each other, so that light of different intensities can directly act on the main body of the photoresistor 30 through the liquid crystal cell 10 .

Referring to FIG. 1 , the signal output terminal 31 includes a first signal output electrode and a second signal output electrode, and both ends of the photoresistor 30 are connected between the first signal output electrode and the second signal output electrode. A DC power supply 32 is connected in series with the first signal output electrode. A first resistor 33 is connected in parallel between the first signal output electrode and the second signal output electrode.

For the use of the signal converter: when the signal input terminal 11 connected to the liquid crystal cell 10 makes the amplitude of the input voltage signal greater than the threshold voltage, when the input voltage signal is less than the threshold voltage, the anchoring force of the vertical liquid crystal cell 10 to the liquid crystal molecules is greater than Under the action of electric field force, the liquid crystal molecules are aligned perpendicular to the liquid crystal cell 10 . At this time, the long axis of the dichroic dye 12 is perpendicular to the polarized light direction, and the absorption of light by the molecules of the dichroic dye 12 is minimal. The liquid crystal box 10 is in a transparent state, the light entering the black box 20 is the most, the resistance value of the photoresistor 30 is the smallest, the voltage across the photoresistor 30 is the smallest, and the voltage of the signal output terminal 31 reaches the maximum value; when the input voltage signal is greater than the threshold voltage , the anchoring force of the vertical liquid crystal cell 10 to the liquid crystal molecules is smaller than that of the electric field force, and the liquid crystal molecules are arranged parallel to the liquid crystal cell 10 . At this time, the long axis of the dichroic dye 12 is parallel to the direction of polarized light, the molecules of the dichroic dye 12 absorb the light the most, the liquid crystal cell 10 is in a dark state, the light entering the black cell 20 is the least, and the photoresistor 30 blocks the light. The maximum value, the voltage across the photoresistor 30 is the maximum, and the voltage of the signal output terminal 31 reaches the minimum value. That is, when the input voltage of the signal input terminal 11 is greater than the threshold voltage of the dye liquid crystal, the signal output terminal 31 outputs a low level; when the input voltage of the signal input terminal 11 is less than the threshold voltage of the dye liquid crystal, the signal output terminal 31 outputs a high level.

For the state changes when the signal converter is connected to a low voltage and a high voltage, refer to FIGS. 2 to 4 respectively.

2, when the signal input terminal 11 is less than the threshold voltage of the liquid crystal of the dichroic dye 12, the liquid crystal cell 10 is in a transparent state, light enters the black box 20, the resistance of the photoresistor 30 decreases, and the signal output terminal 31 outputs a high output level, recorded as "1".

3, when the signal input terminal 11 is greater than the threshold voltage of the liquid crystal of the dichroic dye 12, the liquid crystal cell 10 is in a dark state, only a small amount of light can enter the black cell 20, the resistance of the photoresistor 30 increases, and the signal output Terminal 31 outputs a low level, denoted as "0".

The signal converter modulates the input signal. Referring to Figure 4, the amplitude change of the input voltage contains information, and the input voltage signal can be converted into corresponding high and low levels after being processed by the device, thereby converting the original analog signal containing the information. Convert directly to digital signal.

The amplitude change of the input voltage of the signal input terminal 11 of the signal converter contains information, and the input voltage signal can be converted into the high and low levels corresponding to the signal output terminal 31 after being processed by the device, so that the original analog signal containing the information can be directly converted to a digital signal.

The above-mentioned signal converter based on dichroic dye liquid crystal can directly convert the input analog signal to digital signal, and even if the input signal waveform is not ideal, the device can still convert the input signal from the input signal in the limited change interval. The information contained in the signal is correctly parsed from the signal.

The above are only preferred embodiments of the present invention, and the present invention is not limited to the above-mentioned embodiments, as long as the technical effect of the present invention is achieved by the same means, all within the spirit and principles of the present disclosure, the Any modification, equivalent replacement, improvement, etc., should be included within the protection scope of the present disclosure. All should belong to the protection scope of the present invention. Various modifications and changes can be made to its technical solutions and/or implementations within the protection scope of the present invention.

Claims (8)

1. a signal converter based on dichroic dye liquid crystal, is characterized in that, comprises: A liquid crystal cell (10), the liquid crystal cell (10) is filled with a liquid crystal mixture, the liquid crystal mixture includes a dichroic dye (12) and a negative liquid crystal (13), and the two end faces of the liquid crystal cell (10) are connected There is a signal input terminal (11) for inputting AC voltage, a black box (20) arranged on one side of the liquid crystal cell (10), A photoresistor (30) arranged in the black box (20), two ends of the photoresistor (30) are connected with a signal output terminal (31) for outputting a high level or a low level. 2. The signal converter based on dichroic dye liquid crystal according to claim 1, wherein, The liquid crystal cell (10) is a vertical liquid crystal cell (10), the liquid crystal cell (10) includes a pair of light-transmitting substrates (14) arranged oppositely, and the signal input end (11) includes a first signal input electrode and a The second signal input electrode, the first signal input electrode and the second signal input electrode are respectively connected to one end of the surface of a pair of light-transmitting substrates (14). 3. The signal converter based on dichroic dye liquid crystal according to claim 1, wherein, The main body of the photoresistor (30) and the main body of the liquid crystal cell (10) are arranged parallel to each other. 4. The signal converter based on dichroic dye liquid crystal according to claim 1, wherein, The signal output terminal (31) includes a first signal output electrode and a second signal output electrode, Wherein, both ends of the photoresistor (30) are connected between the first signal output electrode and the second signal output electrode. 5. The signal converter based on dichroic dye liquid crystal according to claim 5, wherein, A DC power supply (32) is connected in series with the first signal output electrode. 6. The signal converter based on dichroic dye liquid crystal according to claim 5, wherein, A first resistor (33) is connected in parallel between the first signal output electrode and the second signal output electrode. 7. The signal converter based on dichroic dye liquid crystal according to claim 1, wherein, The inner surface of the liquid crystal cell (10) is also provided with a vertical alignment agent. 8. The signal converter based on dichroic dye liquid crystal according to claim 1, wherein, The signal output terminal (31) is arranged outside the liquid crystal cell (10).

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