A signal converter based on dichroic dye liquid crystal

Abstract

The present invention relates to a signal converter based on dichroic dye liquid crystals, comprising: a liquid crystal cell filled with a liquid crystal mixture comprising a dichroic dye and negative liquid crystals; signal input terminals for inputting an AC voltage connected to both end faces of the liquid crystal cell; a black box disposed on one side of the liquid crystal cell; and a photoresistor disposed within the black box, with both ends of the photoresistor connected to signal output terminals for outputting a high or low level. Compared to existing converters, the signal converter based on dichroic dye liquid crystals disclosed in the present invention has improved anti-interference capabilities and reduced energy loss.

Description

Technical Field

[0001] The invention relates to a signal converter based on dichroic dye liquid crystal, belonging to the field of photoelectric information. Background Art

[0002] An analog-to-digital (A / D) converter converts analog signals (voltage or current) into digital signals. The digital signals output by the signal converter can be manipulated or used by instruments, computer peripherals, or microprocessors.

[0003] Existing signal converters can be categorized as direct A / D converters and indirect A / D converters based on their conversion principles. Direct A / D converters, such as successive approximation and parallel comparison types, convert analog signals directly into digital signals. Successive approximation A / D converters are easily implemented using integrated processes and can achieve high resolution and speed, making the successive approximation type the most common type used in current integrated A / D chips. Indirect A / D converters, such as voltage / time conversion (integral), voltage / frequency conversion, and voltage / pulse width conversion, first convert analog quantities into intermediate quantities and then into digital quantities. Integral A / D converters have simple circuits and strong anti-interference capabilities. While they can achieve high resolution, they have relatively slow conversion speeds.

[0004] The converters in existing solutions all have rather complex circuit structures. 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

[0005] The present invention provides a signal converter based on dichroic dye liquid crystal, aiming to solve at least one of the technical problems existing in the prior art.

[0006] The technical solution of the present invention is a signal converter based on dichroic dye liquid crystal, which includes: a liquid crystal box, the liquid crystal box is filled with a liquid crystal mixture, the liquid crystal mixture includes a dichroic dye and a negative liquid crystal, the two end faces of the liquid crystal box are connected to a signal input terminal for inputting an AC voltage, a black box is arranged on one side of the liquid crystal box, and a photoresistor is arranged in the black box, and the two ends of the photoresistor are connected to a signal output terminal for outputting a high level or a low level.

[0007] Furthermore, the liquid crystal box is a vertical liquid crystal box, which includes a pair of transparent substrates arranged opposite to each other, and the signal input end 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.

[0008] Furthermore, the body of the photoresistor and the body of the liquid crystal box are arranged parallel to each other.

[0009] Furthermore, the signal output end 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 two ends of the photoresistor.

[0010] Furthermore, a DC power supply is connected in series to the first signal output electrode.

[0011] Furthermore, a first resistor is connected in parallel between the first signal output electrode and the second signal output electrode.

[0012] Furthermore, a vertical alignment agent is provided on the inner surface of the liquid crystal cell.

[0013] Furthermore, the signal output terminal is arranged outside the liquid crystal box.

[0014] The beneficial effects of the present invention are as follows.

[0015] 1. The above-mentioned signal converter based on dichroic dye liquid crystal can convert the input analog signal into a digital signal. Even if the input signal waveform is not ideal, the device can still correctly parse the information contained in the signal from the input signal within a limited variation range.

[0016] 2. Compared with existing signal converters, the signal converter of the present invention has a simpler circuit structure and reduces dependence on various energy-consuming devices; in addition, the device is a capacitive response device with lower power consumption and is an energy-saving device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 3 is a schematic structural diagram of a signal converter based on dichroic dye liquid crystal according to an embodiment of the present invention.

[0018] Figure 2 3 is a schematic diagram of the state of a signal converter based on dichroic dye liquid crystal according to an embodiment of the present invention when connected to a low voltage.

[0019] Figure 3 1 is a schematic diagram of the state of a signal converter based on dichroic dye liquid crystal according to an embodiment of the present invention when a high voltage is connected.

[0020] Figure 4 1 is a schematic diagram of output signal waveforms corresponding to different input signals of a signal converter based on dichroic dye liquid crystal according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The following will be combined with the embodiments and drawings to clearly and completely describe the concept, specific structure and technical effects of the present invention so as to fully understand the purpose, scheme and effect of the present invention. It should be noted that the embodiments and features in the embodiments of this application can be combined with each other unless there is a conflict.

[0022] It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature or indirectly fixed or connected to the other feature. Furthermore, terms such as "upper," "lower," "left," "right," "top," and "bottom" used in this disclosure are intended solely to describe the relative positions of the components of the disclosure as shown in the accompanying drawings.

[0023] In addition, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. The terms used in this specification are only for describing specific embodiments and are not intended to limit the present invention. The term "and / or" as used herein includes any combination of one or more of the related listed items.

[0024] It should be understood that although the terms first, second, third, etc. may be used to describe various elements in the present disclosure, these elements should not be limited to these terms. These terms are only used to distinguish elements of the same type from each other. For example, a first element may also be referred to as a second element, and similarly, a second element may also be referred to as a first element without departing from the scope of the present disclosure.

[0025] Reference Figures 1 to 4 In some embodiments, the present invention discloses a signal converter based on dichroic dye liquid crystal, comprising:

[0026] Reference Figure 1 A liquid crystal cell 10 is provided. The liquid crystal cell 10 is filled with a liquid crystal mixture comprising a dichroic dye 12 and negative liquid crystals 13. Signal input terminals 11 for inputting an AC voltage are connected to both end faces of the liquid crystal cell 10. A black box 20 is provided on one side of the liquid crystal cell 10 and serves as a light shield. A photoresistor 30 is provided within the black box 20. Both ends of the photoresistor 30 are connected to signal output terminals 31 for outputting a high or low level.

[0027] Reference Figure 1 The liquid crystal cell 10 is a vertical liquid crystal cell 10, and 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 light-transmitting substrates 14. The inner surface of the liquid crystal cell 10 is also provided with a vertical alignment agent, specifically, referring to Figure 1 A vertical alignment agent is provided on the inner surfaces of a pair of substrates arranged opposite to each other, which forms an anchoring effect on the liquid crystal mixture molecules, so that the liquid crystal box 10 remains in a transparent state when the power is off.

[0028] When the amplitude of the AC voltage input to signal input terminal 11 is greater than the threshold voltage of the dichroic dye 12 in the liquid crystal mixture, liquid crystal cell 10 is in a dark state. When the amplitude of the AC voltage input to signal input terminal 11 is less than the threshold voltage of the dye liquid crystal, liquid crystal cell 10 is in a transparent state. Therefore, the aforementioned signal converter can dynamically adjust the visible light illumination of liquid crystal cell 10 based on changes in the input voltage signal, thereby affecting the resistance value of photoresistor 30 in black box 20, and ultimately connecting to signal output terminal 31 to generate different output signals.

[0029] The principle of the liquid crystal cell 10's transition between the dark and transparent states is as follows: The liquid crystal mixture contains negative liquid crystal 13 doped with a dichroic dye 12. The dichroic dye 12 exhibits dichroism, meaning it has different absorption coefficients for polarized light along its long and short axes. When the long axis of the dichroic dye 12 is parallel to the polarization direction, the absorption is maximized; when the long axis is perpendicular to the polarization direction, the absorption is minimized. The liquid crystal molecules of the negative liquid crystal 13 rotate under the influence of an external voltage. This rotation of the negative liquid crystal 13 drives the dye to rotate synchronously, thereby producing the transition between the dark and transparent states.

[0030] The change in resistance of the photoresistor 30 is related to its photoconductivity. When the liquid crystal cell 10 is in the dark state and no light is applied to the photoresistor 30, the resistance of the photoresistor 30 is very high. When the liquid crystal cell 10 is in the transparent state and light is applied to it, the resistance of the photoresistor 30 drops 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.

[0031] Reference Figure 1 The body of the photoresistor 30 and the body of the liquid crystal cell 10 are arranged parallel to each other, so that light of different intensities can directly pass through the liquid crystal cell 10 and act on the body of the photoresistor 30 .

[0032] Reference Figure 1 The signal output terminal 31 includes a first signal output electrode and a second signal output electrode, and the first signal output electrode and the second signal output electrode are connected to the two ends of the photoresistor 30. 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.

[0033] Regarding the use of this signal converter: When the amplitude of the input voltage signal to the signal input terminal 11 connected to the liquid crystal cell 10 is greater than the threshold voltage, and when the input voltage signal is less than the threshold voltage, the anchoring force of the vertical liquid crystal cell 10 on the liquid crystal molecules becomes greater than the electric field force, causing the liquid crystal molecules to align perpendicular to the liquid crystal cell 10. At this point, the long axis of the dichroic dye 12 is perpendicular to the direction of polarized light, and the dichroic dye 12 molecules absorb minimal light. The liquid crystal cell 10 is in a transparent state, allowing the maximum amount of light to enter the black box 20. The resistance of the photoresistor 30 is minimal, the voltage across the photoresistor 30 is minimal, and the voltage at the signal output terminal 31 reaches its maximum value. When the input voltage signal is greater than the threshold voltage, the anchoring force of the vertical liquid crystal cell 10 on the liquid crystal molecules becomes less than the electric field force, causing the liquid crystal molecules to align parallel to the liquid crystal cell 10. At this point, the long axis of the dichroic dye 12 is parallel to the polarization direction, the dichroic dye 12 molecules absorb maximum light, the liquid crystal cell 10 is in a dark state, minimal light enters the black box 20, the photoresistor 30 has a maximum resistance, the voltage across the photoresistor 30 is maximum, and the voltage at the signal output terminal 31 reaches a minimum. Specifically, when the input voltage at 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 at 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.

[0034] For the state changes of the signal converter when it is connected to low voltage and high voltage, refer to Figures 2 to 4 .

[0035] Reference Figure 2 When the signal input terminal 11 is less than the threshold voltage of the dichroic dye 12 liquid crystal, the liquid crystal box 10 is transparent, light enters the black box 20, the resistance of the photoresistor 30 decreases, and the signal output terminal 31 outputs a high level, which is recorded as "1".

[0036] Reference Figure 3 When the signal input terminal 11 is greater than the threshold voltage of the dichroic dye 12 liquid crystal, the liquid crystal box 10 is in a dark state, only a small amount of light can enter the black box 20, the resistance of the photoresistor 30 increases, and the signal output terminal 31 outputs a low level, which is recorded as "0".

[0037] The signal converter modulates the input signal, referring to Figure 4 The amplitude change of the input voltage contains information. The input voltage signal can be converted into corresponding high and low levels after being processed by this device, thereby directly converting the original analog signal containing information into a digital signal.

[0038] The amplitude change of the input voltage at the signal input terminal 11 of the signal converter contains information. After being processed by the device, the input voltage signal can be converted into high and low levels corresponding to the signal output terminal 31, thereby directly converting the original analog signal containing information into a digital signal.

[0039] The above-mentioned signal converter based on dichroic dye liquid crystal can directly convert the input analog signal into a digital signal. Even if the input signal waveform is not ideal, within a limited range of variation, the device can still correctly parse the information contained in the signal from the input signal.

[0040] The above description is merely a preferred embodiment of the present invention. The present invention is not limited to the aforementioned embodiments. As long as the technical effects of the present invention are achieved by the same means, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included within the scope of protection of the present disclosure. Within the scope of protection of the present invention, its technical solutions and / or implementation methods may be modified and varied in various ways.

Claims

1. A signal converter based on dichroic dye liquid crystal, characterized in that: include: A liquid crystal box (10), wherein the liquid crystal box (10) is filled with a liquid crystal mixture, wherein the liquid crystal mixture includes a dichroic dye (12) and a negative liquid crystal (13), and both end surfaces of the liquid crystal box (10) are connected to signal input terminals (11) for inputting an AC voltage. A black box (20) is provided on one side of the liquid crystal box (10), A photoresistor (30) is provided in the black box (20), wherein both ends of the photoresistor (30) are connected to signal output terminals (31) for outputting a high level or a low level; When the input voltage signal is less than the threshold voltage, the anchoring force of the vertical liquid crystal box (10) on the liquid crystal molecules is greater than the electric field force, and the liquid crystal molecules are arranged perpendicular to the liquid crystal box (10); when the input voltage signal is greater than the threshold voltage, the anchoring force of the vertical liquid crystal box (10) on the liquid crystal molecules is less than the electric field force, and the liquid crystal molecules are arranged parallel to the liquid crystal box (10); The signal converter modulates the input signal. The amplitude change of the input voltage contains information. The input voltage signal can be converted into corresponding high and low levels after being processed by the signal converter, and the original analog signal containing information is directly converted into a digital signal.

2. The signal converter based on dichroic dye liquid crystal according to claim 1, characterized in that: The liquid crystal box (10) is a vertical liquid crystal box (10), comprising a pair of light-transmitting substrates (14) arranged opposite to each other, and the signal input end (11) comprises a first signal input electrode and a second signal input electrode, wherein the first signal input electrode and the second signal input electrode are respectively connected to one end of the surface of the pair of light-transmitting substrates (14).

3. The signal converter based on dichroic dye liquid crystal according to claim 1, characterized in that: The body of the photoresistor (30) and the body of the liquid crystal box (10) are arranged parallel to each other.

4. The signal converter based on dichroic dye liquid crystal according to claim 1, characterized in that: The signal output end (31) comprises a first signal output electrode and a second signal output electrode, The first signal output electrode and the second signal output electrode are connected to two ends of a photoresistor (30).

5. The signal converter based on dichroic dye liquid crystal according to claim 4, characterized in that: A DC power supply (32) is connected in series to the first signal output electrode.

6. The signal converter based on dichroic dye liquid crystal according to claim 5, characterized in that: 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, characterized in that: A vertical alignment agent is also provided on the inner surface of the liquid crystal box (10).

8. The signal converter based on dichroic dye liquid crystal according to claim 1, characterized in that: The signal output end (31) is arranged outside the liquid crystal box (10).

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