Ballbladder Zi phase liquid crystal dynamic driving circuit

Abstract

The utility model discloses a gallbladder Zi phase liquid crystal dynamic driving circuit, which comprises a direct current booster circuit and an H-bridge driving circuit, and is characterized in that the direct current booster circuit is used for boosting input direct current and then outputting the boosted direct current; a DC boost circuit is formed by a boost inductor L1, a first switch tube Q1, a first diode U5-1, a first capacitor C2, a second capacitor C7 and a first resistor R1. The H-bridge driving circuit is connected with the output end of the first boost power supply, and the H-bridge driving circuit is used for converting the first boost power supply into a gall Zi phase liquid crystal dynamic driving signal under the action of a driving control signal so as to output the gall Zi phase liquid crystal dynamic driving signal to carry out local or global refreshing on the gall Zi phase liquid crystal. In the boost circuit, an RC buffer circuit is formed by the first resistor R1 and the second capacitor C7, the output voltage of the first capacitor C2 can be cached and then output, interference is reduced, so that HVTE detection is more accurate, false detection is avoided, and high precision and stability of the first boost power supply are ensured. Therefore, the H-bridge drive circuit has a good refreshing effect on the gall Zi-phase liquid crystal.

Description

Technical Field

[0001] The utility model relates to the technical field of cholestatic liquid crystal driving, in particular to a cholestatic liquid crystal dynamic driving circuit. Background Art

[0002] In the prior art, liquid crystal writing tablets are often manufactured by utilizing the characteristic of cholesteric bistable liquid crystals that they can maintain display without continuous power supply. Cholesteric liquid crystals have two stable states, FC state and P state. When the cholesteric liquid crystal is in the FC state, the liquid crystal writing tablet appears to be transparent from the outside; when the cholesteric liquid crystal is in the P state under pressure, it can reflect light of a fixed wavelength, so that the liquid crystal writing tablet can display handwriting. Since the FC state and the P state of the cholesteric liquid crystal do not require voltage and can be maintained for a long time, the energy consumption of this type of liquid crystal writing tablet is extremely low.

[0003] The display of cholesteric phase liquid crystal needs to be driven by a driving circuit. Usually, cholesteric phase liquid crystal is powered by a low-voltage battery. The battery power supply voltage usually cannot meet the driving voltage requirements of cholesteric phase liquid crystal. Therefore, it is usually necessary to use a boost circuit to boost the battery output power supply as the driving voltage of cholesteric phase liquid crystal. However, the existing boost circuit is usually complex and has a high failure rate, and the boost output voltage is unstable, resulting in poor refresh effect of cholesteric phase liquid crystal. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, one purpose of the utility model is to provide a cholesteric phase liquid crystal dynamic driving circuit.

[0005] To achieve the above object, a cholestatic liquid crystal dynamic driving circuit according to an embodiment of the utility model includes:

[0006] A DC boost circuit, the DC boost circuit is used to boost input DC power and then output it; the DC boost circuit includes a boost inductor L1, a first switch tube Q1, a first diode U5-1, a first capacitor C2, a second capacitor C7 and a first resistor R1, one end of the boost inductor L1 is connected to the input DC power supply, the other end of the boost inductor L1 is connected to the first end of the first switch tube Q1, the second end of the first switch tube Q1 is connected to a reference ground, the controlled end of the first switch tube Q1 is connected to a boost control signal, the other end of the boost inductor L1 is also connected to the anode of the first diode U5-1, the cathode of the first diode U5-1 is respectively connected to one end of the first capacitor C2, one end of the second capacitor C7 and one end of the first resistor R1, the other end of the first capacitor C2 is connected to the reference ground, the other end of the second capacitor C7 and the other end of the first resistor R1 output a voltage detection signal, and the one end of the first capacitor C2 also outputs the first boost power supply;

[0007] An H-bridge driving circuit is connected to the output end of the first boost power supply. The H-bridge driving circuit is used to convert the first boost power supply into a cholesteric phase liquid crystal dynamic driving signal under the action of a driving control signal, so as to output a local or global refresh of the cholesteric phase liquid crystal.

[0008] Further, according to an embodiment of the utility model, the DC boost circuit also includes a second diode U5-2, the anode of the second diode U5-2 is connected to the one end of the first capacitor C2, and the cathode of the second diode U5-2 is connected to the H-bridge drive circuit to output the first boost power supply to the H-bridge drive circuit.

[0009] Further, according to an embodiment of the utility model, the cholestatic liquid crystal dynamic driving circuit also includes a voltage doubling circuit, which is used to double the first boost power supply to a second boost power supply and output it to the H-bridge driving circuit. The H-bridge driving circuit is used to convert the first boost power supply or the second boost power supply into a cholestatic liquid crystal dynamic driving signal under the action of a driving control signal, so as to output the signal for local or global refresh of the cholestatic liquid crystal.

[0010] Further, according to an embodiment of the utility model, the voltage doubling circuit includes:

[0011] a third capacitor C6, one end of the third capacitor C6 being connected to the first end of the first switch tube Q1;

[0012] A third diode U4-1, wherein an anode of the third diode U4-1 is connected to the other end of the third capacitor C6;

[0013] a fourth diode U4-2, wherein a cathode of the fourth diode U4-2 is connected to an anode of the third diode U4-1;

[0014] A fourth capacitor C3, one end of the fourth capacitor C3 is connected to the cathode of the third diode U4-1, the other end of the fourth capacitor C3 is respectively connected to the one end of the first capacitor C2 and the anode of the fourth diode U4-2, and the one end of the fourth capacitor C3 outputs the second boost power supply.

[0015] Further, according to an embodiment of the utility model, the cholestatic liquid crystal dynamic driving circuit also includes a power output control circuit, and the power output control circuit is arranged between the second boost power supply output terminal and the H-bridge driving circuit to control the output of the second boost power supply under the action of a control signal.

[0016] Further, according to an embodiment of the present utility model, the power output control circuit includes:

[0017] A first MOS transistor Q2, wherein the source of the first MOS transistor Q2 is connected to the output end of the second boost power supply, the source of the first MOS transistor Q2 is also connected to the gate of the first MOS transistor Q2 through a second resistor R14, and the drain of the first MOS transistor Q2 is connected to the H-bridge drive circuit;

[0018] A first transistor Q3, wherein the collector of the first transistor Q3 is connected to the gate of the first MOS transistor Q2 through a third resistor R15, the emitter of the first transistor Q3 is connected to a reference ground, and the base of the first MOS transistor Q2 is connected to a control signal through a fourth resistor R26, so as to perform on- or off-driving control on the first MOS transistor Q2 through the first transistor Q3.

[0019] Further, according to an embodiment of the utility model, the cholesteric phase liquid crystal dynamic driving circuit also includes a release circuit, and the release circuit is connected to the output ends of the first boost power supply and the second boost power supply to release the electric quantity of the first capacitor C2 and / or the fourth capacitor C3 under the action of the control signal; the release circuit includes:

[0020] A second switch tube Q6, one end of the second switch tube Q6 is connected to the first boost power supply and the second boost power supply output end through a fifth resistor R2, the other end of the second switch tube Q6 is connected to the reference ground, and the control end of the second switch tube Q6 is connected to the control through a sixth resistor R3.

[0021] Further, according to an embodiment of the present utility model, the first switch tube Q1 and the second switch tube Q6 are triodes respectively; the one end of the first switch tube Q1 is the collector of the triode, the other end of the first switch tube Q1 is the emitter of the triode, and the controlled end of the second switch tube Q6 is the base of the triode;

[0022] The one end of the second switch tube Q6 is the collector of the transistor, the other end of the second switch tube Q6 is the emitter of the transistor, and the controlled end of the second switch tube Q6 is the base of the transistor.

[0023] Further, according to an embodiment of the present utility model, the H-bridge driving circuit includes:

[0024] a second MOS transistor Q7, wherein the source of the second MOS transistor Q7 is connected to the output end of the first boost power supply or the second boost power supply, the source of the second MOS transistor Q7 is also connected to the gate of the second MOS transistor Q7 through a seventh resistor R16, the drain of the second MOS transistor Q7 is connected to one end of an eighth resistor R25, and the other end of the eighth resistor R25 is connected to a signal end of a cholesteric phase liquid crystal;

[0025] a second triode Q8, wherein the collector of the second triode Q8 is connected to the gate of the second MOS transistor Q7 through a ninth resistor R18, the emitter of the second triode Q8 is connected to the reference ground, and the base of the second triode Q8 is connected to the control signal, so as to control the second MOS transistor Q7 to be turned on or off under the action of the control signal;

[0026] a third triode Q10, wherein the collector of the third triode Q10 is connected to the other end of the eighth resistor R25 through a tenth resistor R24, the emitter of the third triode Q10 is connected to the reference ground, and the base of the third triode Q10 is connected to the control end through an eleventh resistor R22;

[0027] a third MOS transistor Q5, wherein the source of the third MOS transistor Q5 is connected to the output end of the first boost power supply or the second boost power supply, the source of the third MOS transistor Q5 is also connected to the gate of the third MOS transistor Q5 through a twelfth resistor R17, the drain of the third MOS transistor Q5 is connected to one end of a thirteenth resistor R27, and the other end of the thirteenth resistor R27 is connected to the other signal end of the cholesteric phase liquid crystal;

[0028] a fourth triode Q9, wherein the collector of the fourth triode Q9 is connected to the gate of the third MOS tube Q5 through a fourteenth resistor R19, the emitter of the fourth triode Q9 is connected to the reference ground, and the base of the fourth triode Q9 is connected to the control signal, so as to perform on-off driving control on the third MOS tube Q5 under the action of the control signal;

[0029] A fifth transistor Q11, a collector of the fifth transistor Q11 is connected to the other end of the thirteenth resistor R27 through a fifteenth resistor R28, an emitter of the fifth transistor Q11 is connected to a reference ground, and a base of the fifth transistor Q11 is connected to a control end through a sixteenth resistor R23.

[0030] Further, according to an embodiment of the present utility model, the cholesteric phase liquid crystal dynamic driving circuit also includes a power input circuit, and the power input circuit includes:

[0031] A battery interface, the battery interface is used to connect to a battery to introduce the input direct current;

[0032] A jumper interface, wherein the jumper interface is arranged between the battery interface and the DC boost circuit, and the jumper interface is used to control the disconnection or conduction of the output DC power of the battery.

[0033] The embodiment of the utility model provides a dynamic driving circuit for a bipolar phase liquid crystal, wherein a DC boost circuit is used to boost the input DC power and then output it; a DC boost circuit is formed by a boost inductor L1, a first switch tube Q1, a first diode U5-1, a first capacitor C2, a second capacitor C7 and a first resistor R1; an H-bridge driving circuit is connected to the output end of the first boost power supply, and the H-bridge driving circuit is used to convert the first boost power supply into a bipolar phase liquid crystal dynamic driving signal under the action of a driving control signal, so as to output a local or global refresh of the bipolar phase liquid crystal. In the boost circuit, an RC buffer circuit is formed by the first resistor R1 and the second capacitor C7, and the output voltage of the first capacitor C2 can be cached and then output, thereby reducing interference, thereby making the HV_TE detection more accurate, thereby avoiding false detection, and ensuring the high-precision stability of the first boost power supply. This ensures that the H-bridge driving circuit has a good effect on refreshing the bipolar phase liquid crystal. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The utility model provides a schematic diagram of the structure of a cholestatic liquid crystal dynamic driving circuit.

[0035] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] In order to make the technical personnel in the technical field better understand the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described in combination with the drawings in the embodiment of the present invention. Unless otherwise defined, all technical and scientific terms used in this article have the same meaning as those commonly understood by the technical personnel in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0037] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] See also Figure 1The embodiment of the utility model provides a cholesteric liquid crystal dynamic driving circuit, comprising: a DC boost circuit and an H-bridge driving circuit, wherein the DC boost circuit is used to boost the input DC power and then output it; the DC boost circuit comprises a boost inductor L1, a first switch tube Q1, a first diode U5-1, a first capacitor C2, a second capacitor C7 and a first resistor R1, one end of the boost inductor L1 is connected to the input DC power supply, the other end of the boost inductor L1 is connected to the first end of the first switch tube Q1, the second end of the first switch tube Q1 is connected to the reference ground, the controlled end of the first switch tube Q1 is connected to the boost control signal, the other end of the boost inductor L1 is also connected to the anode of the first diode U5-1, the cathode of the first diode U5-1 is respectively connected to one end of the first capacitor C2, one end of the second capacitor C7 and one end of the first resistor R1, the other end of the first capacitor C2 is connected to the reference ground, the other end of the second capacitor C7 and the other end of the first resistor R1 output the voltage detection signal, and the one end of the first capacitor C2 also outputs the first boost power supply. Specifically, Figure 1 As shown in , the first switch tube Q1 can be a triode; the one end of the first switch tube Q1 is the collector of the triode, the other end of the first switch tube Q1 is the emitter of the triode, and the controlled end of the second switch tube Q6 is the base of the triode.

[0039] The working process of the DC boost circuit is that a pulse width signal can be output through the HV_SW signal terminal, and the transistor Q1 can be turned on or off. When the transistor Q1 is turned on, the input DC can charge the boost inductor L1, so that the current of the boost inductor L1 gradually increases, and when the current increases to a certain value, the transistor Q1 begins to cut off under the action of the pulse width control signal HV_SW. At this time, the voltage at both ends of the boost inductor L1 changes suddenly, and after the power supply VCC power supply is superimposed, the first capacitor C2 is charged through the first diode U5-1. Because the transistor Q1 is repeatedly turned on and off under the action of the pulse width signal, the boost voltage L1 can continuously charge the first capacitor C2, so that the voltage on the first capacitor C2 increases to the set voltage value, and stabilizes at the set voltage value, thereby outputting the first boost power supply.

[0040] like Figure 1As shown in , the controller controls the first switch tube Q1 to be turned on or off until it can obtain the actual voltage value of the first capacitor C2 through the HV_TE detection terminal, and controls the first switch tube Q1 to be turned on or off according to the actual voltage value of the first capacitor C2, so as to ensure the stability of the first boost power supply. In order to ensure the accuracy of the signal detected by the first boost power supply, the first resistor R1 and the capacitor C1 can form an RC buffer circuit, and the output voltage of the first capacitor C2 can be cached and then output to reduce interference, thereby making the HV_TE detection more accurate, thereby avoiding false detection and ensuring the high-precision stability of the first boost power supply.

[0041] The H-bridge driving circuit is connected to the output end of the first boost power supply. The H-bridge driving circuit is used to convert the first boost power supply into a cholesteric phase liquid crystal dynamic driving signal under the action of a driving control signal, so as to output a local or global refresh of the cholesteric phase liquid crystal.

[0042] like Figure 1As shown in, in one embodiment of the utility model, the H-bridge driving circuit includes: a second MOS tube Q7, a second triode Q8, a third triode Q10, a third MOS tube Q5, a fourth triode Q9 and a fifth triode Q11, the source of the second MOS tube Q7 is connected to the output end of the first boost power supply or the second boost power supply, the source of the second MOS tube Q7 is also connected to the gate of the second MOS tube Q7 through a seventh resistor R16, the drain of the second MOS tube Q7 is connected to one end of the eighth resistor R25, and the eighth resistor R25 is connected to the gate of the second MOS tube Q7. The other end of the resistor R25 is connected to the first signal end of the cholesteric phase liquid crystal; the collector of the second triode Q8 is connected to the gate of the second MOS tube Q7 through the ninth resistor R18, the emitter of the second triode Q8 is connected to the reference ground, and the base of the second triode Q8 is connected to the control signal, so as to control the on or off driving of the second MOS tube Q7 under the control signal; the collector of the third triode Q10 is connected to the other end of the eighth resistor R25 through the tenth resistor R24, and the emitter of the third triode Q10 is connected to the reference ground. The base of the third transistor Q10 is connected to the control end through the eleventh resistor R22; the source of the third MOS transistor Q5 is connected to the output end of the first boost power supply or the second boost power supply, the source of the third MOS transistor Q5 is also connected to the gate of the third MOS transistor Q5 through the twelfth resistor R17, the drain of the third MOS transistor Q5 is connected to one end of the thirteenth resistor R27, and the other end of the thirteenth resistor R27 is connected to the other signal end of the cholesteric phase liquid crystal; the collector of the fourth transistor Q9 is connected to the output end of the first boost power supply or the second boost power supply through the fourteenth resistor R17. The resistor R19 is connected to the gate of the third MOS transistor Q5, the emitter of the fourth triode Q9 is connected to the reference ground, and the base of the fourth triode Q9 is connected to the control signal, so as to perform on or off driving control on the third MOS transistor Q5 under the action of the control signal; the collector of the fifth triode Q11 is connected to the other end of the thirteenth resistor R27 through the fifteenth resistor R28, the emitter of the fifth triode Q11 is connected to the reference ground, and the base of the fifth triode Q11 is connected to the control end through the sixteenth resistor R23.

[0043] The working process of the H-bridge driving circuit is that when the cholesteric phase liquid crystal needs to be refreshed locally or globally, the controller can output complementary driving signals through the TP1_HV signal terminal and the TP1_VSS signal terminal. When the controller can output a high-level signal through the TP1_HV signal terminal, and the TP1_VSS signal terminal outputs a low-level signal, the second transistor Q8 can be turned on, thereby driving the second MOS transistor Q7 to be turned on, and at this time the third transistor Q10 is turned off, and then the first boost power supply HV can be output to the cholesteric phase liquid crystal through the TP1 signal terminal. On the contrary, when the controller can output a low-level signal through the TP1_HV signal terminal, and the TP1_VSS signal terminal outputs a high-level signal, the second transistor Q8 can be turned off, thereby driving the second MOS transistor Q7 to be turned off, and at this time the third transistor Q10 is turned on, and then a low level can be output to the cholesteric phase liquid crystal through the TP1 signal terminal. In this way, a pulse signal can be output to the cholesteric phase liquid crystal through the TP1 signal terminal as one of the refresh signals. Another refresh signal is output through the TP2 signal terminal, and is used together with the first refresh signal to refresh the cholesteric phase liquid crystal. Since the circuit structure of the other refresh signal formed by the fifth transistor Q11 and the third MOS transistor Q5 is the same as the circuit structure of the refresh signal formed by the second MOS transistor Q7 and the second transistor Q8, the working principle is also basically the same, and will not be repeated again.

[0044] like Figure 1 As shown in , the DC boost circuit also includes a second diode U5-2, the anode of the second diode U5-2 is connected to the one end of the first capacitor C2, and the cathode of the second diode U5-2 is connected to the H-bridge drive circuit to output the first boost power supply to the H-bridge drive circuit. Through the unidirectional conductivity of the second diode U5-2, the voltage backflow of the cholesteric phase liquid crystal can be avoided, and the voltage stability of the first boost power supply is ensured.

[0045] like Figure 1 As shown in , the cholestatic liquid crystal dynamic drive circuit also includes a voltage doubling circuit, and the voltage doubling circuit is used to double the first boost power supply to a second boost power supply, and output it to the H-bridge drive circuit. The H-bridge drive circuit is used to convert the first boost power supply or the second boost power supply into a cholestatic liquid crystal dynamic drive signal under the action of a drive control signal, so as to output a local or global refresh of the cholestatic liquid crystal. In some applications, the voltage of the first boost power supply output by the first capacitor C2 may not meet the voltage requirement of the cholestatic liquid crystal dynamic drive. At this time, the output voltage of the first boost power supply can be doubled by the voltage doubling circuit to become a higher power supply signal to meet the higher voltage requirement of the cholestatic liquid crystal dynamic drive.

[0046] like Figure 1As shown in, the voltage doubling circuit includes: a third capacitor C6, a third diode U4-1, a fourth diode U4-2 and a fourth capacitor C3, one end of the third capacitor C6 is connected to the first end of the first switch tube Q1; the anode of the third diode U4-1 is connected to the other end of the third capacitor C6; the cathode of the fourth diode U4-2 is connected to the anode of the third diode U4-1; one end of the fourth capacitor C3 is connected to the cathode of the third diode U4-1, and the other end of the fourth capacitor C3 is respectively connected to the one end of the first capacitor C2 and the anode of the fourth diode U4-2, and the one end of the fourth capacitor C3 outputs the second boost power supply.

[0047] Specifically, the working process of the voltage doubling circuit is that when the transistor Q1 is turned on, the first capacitor C2 can charge the third capacitor C6 through the fourth diode U4-2, and charge the voltage of the third capacitor C6 to the voltage value of the first boost power supply, and when the transistor Q1 is turned off, the input power supply VCC power supply, the inductor L1 and the electric quantity of the third capacitor C6 can charge the fourth capacitor C3 through the third diode U4-1, at this time, the fourth capacitor C3 and the first capacitor C2 are connected in series, so that the voltage of the fourth capacitor C3 is higher than the voltage of the first capacitor C2. In this way, the second boost power supply with a higher voltage can be output as a power supply signal to meet the higher voltage requirements of the dynamic drive of the biphasic liquid crystal.

[0048] like Figure 1 As shown in , the cholesteric phase liquid crystal dynamic driving circuit also includes a power output control circuit, and the power output control circuit is arranged between the second boost power output terminal and the H-bridge driving circuit to control the output of the second boost power under the action of a control signal. The output of the second boost power can be controlled by the power output control circuit, so that the second boost power can be output when it is necessary.

[0049] The power output control circuit includes: a first MOS tube Q2 and a first triode Q3, wherein the source of the first MOS tube Q2 is connected to the second boost power output terminal, the source of the first MOS tube Q2 is also connected to the gate of the first MOS tube Q2 through a second resistor R14, and the drain of the first MOS tube Q2 is connected to the H-bridge drive circuit; the collector of the first triode Q3 is connected to the gate of the first MOS tube Q2 through a third resistor R15, the emitter of the first triode Q3 is connected to a reference ground, and the base of the first MOS tube Q2 is connected to a control signal through a fourth resistor R26, so as to perform on or off driving control on the first MOS tube Q2 through the first triode Q3.

[0050] Specifically, the working process of the power output control circuit is that when the second boost power supply needs to be output as a refresh boost signal to the H-bridge drive circuit, the controller can output a high-level signal through the PL_EN signal terminal, so that the first transistor Q3 can be turned on, and then the first MOS tube Q2 can also be turned on. At this time, the second boost power supply can be output to the H-bridge drive circuit through the first MOS tube Q2. The H-bridge drive circuit can generate a cholesteric liquid crystal dynamic drive refresh signal based on the second boost power supply.

[0051] On the contrary, when only the first boost power supply needs to be output as a refresh boost signal to the H-bridge drive circuit, the controller can output a low-level signal through the PL_EN signal terminal, so that the first transistor Q3 can be turned off, and then the first MOS tube Q2 can also be turned off. At this time, the second boost power supply is not output to the outside. The first boost power supply can be output to the H-bridge drive circuit through the second diode U5-2, and the H-bridge drive circuit can generate a bipolar liquid crystal dynamic drive refresh signal according to the first boost power supply.

[0052] like Figure 1 As shown in , the bipolar phase liquid crystal dynamic driving circuit also includes a release circuit, which is connected to the output ends of the first boost power supply and the second boost power supply to release the charge of the first capacitor C2 and / or the fourth capacitor C3 under the control signal; the release circuit includes: a second switch tube Q6, one end of the second switch tube Q6 is connected to the output ends of the first boost power supply and the second boost power supply through a fifth resistor R2, the other end of the second switch tube Q6 is connected to the reference ground, and the control end of the second switch tube Q6 is connected to the control through a sixth resistor R3. Wherein, the second switch tube Q6 can be a triode; the one end of the second switch tube Q6 is the collector of the triode, the other end of the second switch tube Q6 is the emitter of the triode, and the controlled end of the second switch tube Q6 is the base of the triode.

[0053] Specifically, during the application process, it is sometimes necessary to release the charge of the first capacitor C2 or the fourth capacitor C3 to facilitate the next refresh, so the charge of the first capacitor C2 or the fourth capacitor C3 can be released through the release circuit. The working process of the release circuit is that when the charge of the first capacitor C2 or the fourth capacitor C3 needs to be released, the controller can output a high-level signal through the E_HV_EN signal terminal, so that the transistor Q6 can be turned on. At this time, the first capacitor C2 and the fourth capacitor C3 can be discharged through the fifth resistor R2. Thereby, the charge of the first capacitor C2 and the fourth capacitor C3 is released.

[0054] like Figure 1As shown in , the power input circuit includes: a battery interface BT1 and a jumper interface, the battery interface is used to connect to a battery to introduce the input DC power; the battery interface BT1 can be connected to a battery, so that the back-end circuit can be powered by the battery.

[0055] The jumper interface J2 is provided between the battery interface BT1 and the DC boost circuit, and is used to control the disconnection or conduction of the DC output of the battery. A jumper or a switch can be connected through the jumper interface J2, so that the power supply of the battery can be controlled to be turned on or off. When the battery is needed to supply power, the output circuit of the battery can be turned off, thereby saving the power of the battery.

[0056] The above are only embodiments of the utility model, but they do not limit the patent scope of the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above specific implementations, or replace some of the technical features therein with equivalents. Any equivalent structure made by using the contents of the utility model specification and drawings, directly or indirectly used in other related technical fields, is also within the scope of protection of the utility model patent.

[0057] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0058] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention, all of which are within the scope of protection of the present invention.

Claims

1. A cholestatic liquid crystal dynamic driving circuit, characterized in that: include: A direct current boost circuit, the direct current boost circuit is used for boosting input direct current and then outputting it; the direct current boost circuit comprises a boost inductor (L1), a first switch tube (Q1), a first diode (U5-1), a first capacitor (C2), a second capacitor (C7) and a first resistor (R1), one end of the boost inductor (L1) is connected to an input direct current power supply, the other end of the boost inductor (L1) is connected to a first end of the first switch tube (Q1), the second end of the first switch tube (Q1) is connected to a reference ground, and the first switch tube (Q1) is connected to a reference ground. The control end is connected to the boost control signal, the other end of the boost inductor (L1) is also connected to the anode of the first diode (U5-1), the cathode of the first diode (U5-1) is respectively connected to one end of the first capacitor (C2), one end of the second capacitor (C7) and one end of the first resistor (R1), the other end of the first capacitor (C2) is connected to the reference ground, the other end of the second capacitor (C7) and the other end of the first resistor (R1) output a voltage detection signal, and the one end of the first capacitor (C2) also outputs a first boost power supply; An H-bridge driving circuit is connected to the output end of the first boost power supply. The H-bridge driving circuit is used to convert the first boost power supply into a cholesteric phase liquid crystal dynamic driving signal under the action of a driving control signal, so as to output a local or global refresh of the cholesteric phase liquid crystal.

2. The cholesteric phase liquid crystal dynamic driving circuit according to claim 1, characterized in that: The DC boost circuit also includes a second diode (U5-2), an anode of the second diode (U5-2) is connected to the one end of the first capacitor (C2), and a cathode of the second diode (U5-2) is connected to the H-bridge drive circuit to output the first boost power supply to the H-bridge drive circuit.

3. The cholesteric phase liquid crystal dynamic driving circuit according to claim 1 or 2, characterized in that: It also includes a voltage doubling circuit, which is used to double the first boost power supply into a second boost power supply and output it to the H-bridge drive circuit. The H-bridge drive circuit is used to convert the first boost power supply or the second boost power supply into a cholesteric liquid crystal dynamic drive signal under the action of a drive control signal, so as to output a local or global refresh of the cholesteric liquid crystal.

4. The cholesteric phase liquid crystal dynamic driving circuit according to claim 3, characterized in that: The voltage doubling circuit comprises: a third capacitor (C6), one end of the third capacitor (C6) being connected to the first end of the first switch tube (Q1); a third diode (U4-1), wherein an anode of the third diode (U4-1) is connected to the other end of the third capacitor (C6); a fourth diode (U4-2), wherein a cathode of the fourth diode (U4-2) is connected to an anode of the third diode (U4-1); A fourth capacitor (C3), one end of the fourth capacitor (C3) is connected to the cathode of the third diode (U4-1), the other end of the fourth capacitor (C3) is respectively connected to the one end of the first capacitor (C2) and the anode of the fourth diode (U4-2), and the one end of the fourth capacitor (C3) outputs the second boost power supply.

5. The cholesteric phase liquid crystal dynamic driving circuit according to claim 4, characterized in that: It also includes a power output control circuit, which is arranged between the output end of the second boost power supply and the H-bridge drive circuit to control the output of the second boost power supply under the action of a control signal.

6. The cholesteric phase liquid crystal dynamic driving circuit according to claim 5, characterized in that: The power output control circuit comprises: a first MOS transistor (Q2), wherein a source electrode of the first MOS transistor (Q2) is connected to the output end of the second boost power supply, the source electrode of the first MOS transistor (Q2) is also connected to the gate electrode of the first MOS transistor (Q2) via a second resistor (R14), and the drain electrode of the first MOS transistor (Q2) is connected to the H-bridge drive circuit; A first triode (Q3), wherein the collector of the first triode (Q3) is connected to the gate of the first MOS tube (Q2) through a third resistor (R15), the emitter of the first triode (Q3) is connected to a reference ground, and the base of the first MOS tube (Q2) is connected to a control signal through a fourth resistor (R26), so as to control the first MOS tube (Q2) to be turned on or off through the first triode (Q3).

7. The cholesteric phase liquid crystal dynamic driving circuit according to claim 5 or 6, characterized in that: The device also includes a release circuit, which is connected to the output terminals of the first boost power supply and the second boost power supply to release the electric quantity of the first capacitor (C2) and / or the fourth capacitor (C3) under the action of a control signal; the release circuit includes: A second switch tube (Q6), one end of the second switch tube (Q6) is connected to the first boost power supply and the second boost power supply output end through a fifth resistor (R2), the other end of the second switch tube (Q6) is connected to a reference ground, and a control end of the second switch tube (Q6) is connected to a control through a sixth resistor (R3).

8. The cholesteric phase liquid crystal dynamic driving circuit according to claim 7, characterized in that: The first switch tube (Q1) and the second switch tube (Q6) are triodes respectively; one end of the first switch tube (Q1) is the collector of the triode, the other end of the first switch tube (Q1) is the emitter of the triode, and the controlled end of the second switch tube (Q6) is the base of the triode; The one end of the second switch tube (Q6) is the collector of the transistor, the other end of the second switch tube (Q6) is the emitter of the transistor, and the controlled end of the second switch tube (Q6) is the base of the transistor.

9. The cholesteric phase liquid crystal dynamic driving circuit according to claim 3, characterized in that: The H-bridge driving circuit comprises: a second MOS transistor (Q7), wherein the source of the second MOS transistor (Q7) is connected to the output end of the first boost power supply or the second boost power supply, the source of the second MOS transistor (Q7) is also connected to the gate of the second MOS transistor (Q7) through a seventh resistor (R16), the drain of the second MOS transistor (Q7) is connected to one end of an eighth resistor (R25), and the other end of the eighth resistor (R25) is connected to a signal end of a cholesteric phase liquid crystal; a second triode (Q8), wherein the collector of the second triode (Q8) is connected to the gate of the second MOS tube (Q7) through a ninth resistor (R18), the emitter of the second triode (Q8) is connected to a reference ground, and the base of the second triode (Q8) is connected to a control signal, so as to control the second MOS tube (Q7) to be turned on or off under the action of the control signal; a third triode (Q10), wherein the collector of the third triode (Q10) is connected to the other end of the eighth resistor (R25) through a tenth resistor (R24), the emitter of the third triode (Q10) is connected to a reference ground, and the base of the third triode (Q10) is connected to the control end through an eleventh resistor (R22); a third MOS tube (Q5), wherein the source of the third MOS tube (Q5) is connected to the output end of the first boost power supply or the second boost power supply, the source of the third MOS tube (Q5) is also connected to the gate of the third MOS tube (Q5) through a twelfth resistor (R17), the drain of the third MOS tube (Q5) is connected to one end of a thirteenth resistor (R27), and the other end of the thirteenth resistor (R27) is connected to the other signal end of the cholesteric phase liquid crystal; a fourth triode (Q9), wherein the collector of the fourth triode (Q9) is connected to the gate of the third MOS tube (Q5) through a fourteenth resistor (R19), the emitter of the fourth triode (Q9) is connected to a reference ground, and the base of the fourth triode (Q9) is connected to a control signal, so as to control the on or off driving of the third MOS tube (Q5) under the action of the control signal; A fifth transistor (Q11), wherein the collector of the fifth transistor (Q11) is connected to the other end of the thirteenth resistor (R27) through a fifteenth resistor (R28), the emitter of the fifth transistor (Q11) is connected to a reference ground, and the base of the fifth transistor (Q11) is connected to a control end through a sixteenth resistor (R23).

10. The cholesteric phase liquid crystal dynamic driving circuit according to claim 7, characterized in that: Also included is a power input circuit, the power input circuit comprising: A battery interface, the battery interface is used to connect to a battery to introduce the input direct current; A jumper interface, wherein the jumper interface is arranged between the battery interface and the DC boost circuit, and the jumper interface is used to control the disconnection or conduction of the output DC power of the battery.

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