CN210349266U - Liquid crystal display screen and voltage dynamic adjusting circuit thereof - Google Patents
Liquid crystal display screen and voltage dynamic adjusting circuit thereof Download PDFInfo
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- CN210349266U CN210349266U CN201920984671.4U CN201920984671U CN210349266U CN 210349266 U CN210349266 U CN 210349266U CN 201920984671 U CN201920984671 U CN 201920984671U CN 210349266 U CN210349266 U CN 210349266U
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Abstract
The utility model discloses a liquid crystal display and voltage dynamic adjustment circuit thereof, the voltage dynamic adjustment circuit includes the control unit, digital analog conversion unit, the first filtering unit reaches, the regulating unit, wherein, the control unit is used for exporting the digital PWM signal that the duty ratio is adjustable; the digital-to-analog conversion unit is used for converting the digital PWM signal output by the control unit into a corresponding analog signal; the first filtering unit is used for filtering and converting the analog signal output by the digital-to-analog conversion unit into a direct-current level signal; the adjusting unit is used for dynamically adjusting the direct current level signal output by the first filtering unit and then outputting the direct current level signal; when the dynamic voltage adjusting circuit is applied to the liquid crystal display screen, different deflection voltages can be obtained only by directly adjusting the duty ratio of the PWM signal, the dynamic voltage adjusting circuit is used for deflection of liquid crystal molecules of the liquid crystal display screens with different specifications, the dynamic voltage adjusting circuit is simple and convenient, the production cost is reduced, and the universality is enhanced.
Description
Technical Field
The utility model relates to an electronic circuit technical field, in particular to liquid crystal display and voltage dynamic adjustment circuit thereof.
Background
At present, the application of the liquid crystal display screen is more and more extensive, and in order to meet different application environments, the specification of the liquid crystal display screen is more and more; for driving liquid crystal molecules of various liquid crystal display screens with different specifications, different hardware driving circuits need to be designed to meet the requirements of different liquid crystal molecule deflection voltages. The method brings great troubles to the wide application of the liquid crystal display screen, and has high production cost and low universality. Therefore, the utility model relates to a circuit avoids the appearance of above-mentioned problem.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a voltage dynamic adjustment circuit aims at providing the liquid crystal molecules that different deflection voltages gave the liquid crystal display of different specifications.
In order to achieve the above object, the present invention provides a voltage dynamic adjustment circuit, which includes:
a control unit for outputting a digital PWM (Pulse Width Modulation) signal with an adjustable duty ratio;
the input end of the digital-to-analog conversion unit is connected with the output end of the control unit and is used for converting the digital PWM signal output by the control unit into a corresponding analog signal;
the input end of the first filtering unit is connected with the output end of the digital-to-analog conversion unit and is used for filtering and converting the analog signal output by the digital-to-analog conversion unit into a direct-current level signal;
and the input end of the adjusting unit is connected with the output end of the first filtering unit and is used for dynamically adjusting and outputting the direct-current level signal output by the first filtering unit.
Preferably, the digital-to-analog conversion unit includes a power supply, a first triode and a first resistor, a base of the first triode is used as an input end of the digital-to-analog conversion unit and connected with an output end of the control unit, a collector of the first triode is connected with an output end of the power supply through the first resistor, an emitter of the first triode is grounded, and a common connection end between the collector of the first triode and the first resistor is used as an output end of the digital-to-analog conversion unit and connected with an input end of the first filtering unit.
Preferably, the first filtering unit includes a second resistor, a third resistor, a fourth resistor and a first capacitor, one end of the second resistor is used as the input end of the first filtering unit and connected to the output end of the digital-to-analog conversion unit, the other end of the second resistor is connected to one end of the third resistor and one end of the first capacitor, the other end of the first capacitor is grounded, the other end of the third resistor is connected to one end of the fourth resistor, the other end of the fourth resistor is grounded, and a common connection end between the third resistor and the fourth resistor is used as the output end of the first filtering unit and connected to the adjusting unit.
Preferably, the adjusting unit includes a second triode, a base of the second triode is used as an input end of the adjusting unit and is connected with an output end of the first filtering unit, a collector of the second triode is connected with an output end of the power supply, and an emitter of the second triode is used as an output end of the adjusting unit to output a voltage signal.
Preferably, the adjusting unit further includes a fifth resistor, and the fifth resistor is disposed between the power supply and the collector of the second transistor.
Preferably, the first triode and the second triode are both NPN-type triodes.
Preferably, the second triode operates in a current amplification state.
Preferably, the voltage dynamic adjustment circuit further includes a second filtering unit, where the second filtering unit includes a sixth resistor and a second capacitor, and the sixth resistor and the second capacitor are connected in parallel between the output end of the adjusting unit and ground.
Preferably, the voltage dynamic adjustment circuit further includes a seventh resistor for current limiting, and the seventh resistor is disposed between the output end of the control unit and the input end of the digital-to-analog conversion unit.
Furthermore, the utility model provides a liquid crystal display, this liquid crystal display includes voltage dynamic adjustment circuit, and the voltage of this voltage dynamic adjustment circuit output is used for doing liquid crystal display's liquid crystal molecule provides deflection voltage. The voltage dynamic adjustment circuit comprises:
the control unit is used for outputting a digital PWM signal with adjustable duty ratio;
the input end of the digital-to-analog conversion unit is connected with the output end of the control unit and is used for converting the digital PWM signal output by the control unit into a corresponding analog signal;
the input end of the first filtering unit is connected with the output end of the digital-to-analog conversion unit and is used for filtering and converting the analog signal output by the digital-to-analog conversion unit into a direct-current level signal;
and the input end of the adjusting unit is connected with the output end of the first filtering unit and is used for dynamically adjusting and outputting the direct-current level signal output by the first filtering unit.
The utility model discloses technical scheme's voltage dynamic adjustment circuit as long as the duty cycle of the digital PWM signal that the adjustment control unit exported, can obtain required voltage. When the voltage dynamic adjusting circuit is applied to the liquid crystal display screen, different deflection voltages can be obtained only by directly adjusting the duty ratio of the PWM signal, and the voltage dynamic adjusting circuit is used for deflection of liquid crystal molecules of the liquid crystal display screens with different specifications. Compared with the traditional drive circuit of the liquid crystal display screen, the liquid crystal display screens with different specifications can be driven quickly without respective improvement of corresponding hardware drive circuits, so that the method is simple and convenient, the production cost is reduced, and the universality is enhanced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic diagram of a module connection according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an embodiment of the dynamic voltage adjustment circuit of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | Control unit | R5 | |
| 200 | Digital-to-analog conversion unit | R6 | |
| 300 | First filter unit | R7 | |
| 400 | Adjusting unit | C1 | |
| 500 | Second filter unit | C2 | Second capacitor |
| R1 | A first resistor | Q1 | A first triode |
| R2 | Second resistance | Q2 | Second triode |
| R3 | Third resistance | ADD | Power supply |
| R4 | Fourth resistor |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a voltage dynamic adjustment circuit.
In the embodiment of the present invention, as shown in fig. 1, the voltage dynamic adjustment circuit includes:
a control unit 100 for outputting a digital PWM signal with an adjustable duty ratio;
an input end of the digital-to-analog conversion unit 200 is connected to an output end of the control unit 100, and is configured to convert the digital PWM signal output by the control unit 100 into a corresponding analog signal;
a first filtering unit 300, an input end of the first filtering unit 300 is connected to an output end of the digital-to-analog converting unit 200, and is configured to filter and convert the analog signal output by the digital-to-analog converting unit 200 into a direct current level signal;
and an adjusting unit 400, an input end of the adjusting unit 400 is connected to an output end of the first filtering unit 300, and is configured to dynamically adjust and output the dc level signal output by the first filtering unit 300.
In this embodiment, the control unit 100 may be implemented by a single chip, and the single chip outputs a digital PWM signal with an adjustable duty ratio through internal setting, that is, the pulse width of the digital PWM signal is adjustable. After the digital PWM signal is loaded to the digital-to-analog conversion unit 200, the digital-to-analog conversion unit 200 converts the digital PWM signal into a voltage analog signal with periodically changing high and low voltages, and the high and low changing rules of the voltage analog signal correspond to the digital PWM signal. Then, the voltage analog signal is filtered by the first filtering unit 300 and then becomes a dc level signal; the direct current level signal and the voltage analog signal are in a change period, the duration of the high level is in proportion to the whole period, namely the magnitude of the direct current level signal is related to the duty ratio of the digital PWM signal; finally, the dc level signal is outputted to the adjusting unit 400, and the required dynamic voltage is outputted after the fine adjustment of the adjusting unit 400.
By the above-mentioned dynamic voltage adjusting circuit, the required voltage can be obtained by adjusting the duty ratio of the digital PWM signal output by the control unit 100. When the voltage dynamic adjusting circuit is applied to the liquid crystal display screen, different deflection voltages can be obtained only by directly adjusting the duty ratio of the PWM signal, and the voltage dynamic adjusting circuit is used for deflection of liquid crystal molecules of the liquid crystal display screens with different specifications. Compared with the traditional drive circuit of the liquid crystal display screen, the liquid crystal display screens with different specifications can be driven quickly without respective improvement of corresponding hardware drive circuits, so that the method is simple and convenient, the production cost is reduced, and the universality is enhanced.
Specifically, as shown in fig. 2, the digital-to-analog conversion unit 200 includes a power supply ADD, a first transistor Q1 and a first resistor R1, a base of the first transistor Q1 is connected to an input terminal of the digital-to-analog conversion unit 200 and an output terminal of the control unit 100, a collector of the first transistor Q1 is connected to an output terminal of the power supply ADD through a first resistor R1, an emitter of the first transistor Q1 is grounded, and a common connection terminal between the collector of the first transistor Q1 and the first resistor R1 is connected to an input terminal of the first filtering unit 300 as an output terminal of the digital-to-analog conversion unit 200.
In this embodiment, the first transistor Q1 is preferably an NPN transistor. When the digital PWM signal output by the control unit 100 is at a high level, the first transistor Q1 is turned on, and at this time, since the emitter of the first transistor Q1 is grounded, the voltage of the collector of the first transistor Q1 is rapidly pulled low, and at this time, the digital-to-analog conversion unit 200 outputs a low level signal; when the digital PWM signal output by the control unit 100 is at a low level, the first transistor Q1 is turned off, and at this time, since the collector of the first transistor Q1 is connected to the power supply ADD through the first resistor R1, the voltage of the collector of the first transistor Q1 is pulled up to a high level by the power supply ADD, and at this time, the digital-to-analog conversion unit 200 outputs a high level signal. The digital-to-analog conversion unit 200 outputs a voltage analog signal with high and low voltage changes opposite to the digital PWM signal waveform output by the control unit 100.
Specifically, the first filter unit 300 includes a second resistor R2, a third resistor R3, a fourth resistor R4, and a first capacitor C1, wherein one end of the second resistor R2 is connected to the output end of the digital-to-analog conversion unit 200 as the input end of the first filter unit 300, the other end of the second resistor R2 is connected to one end of the third resistor R3 and one end of the first capacitor C1, the other end of the first capacitor C1 is grounded, the other end of the third resistor R3 is connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 is grounded, and a common connection end between the third resistor R3 and the fourth resistor R4 is connected to the adjustment unit 400 as the output end of the first filter unit 300.
In the present embodiment, the voltage of the output of the power supply source ADD is VADDWhen the digital PWM signal output from the control unit 100 is at a low level, the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 are connected in series between the power supply ADD and the ground. According to the partial pressure principle, the following can be obtained: the voltage value of the voltage analog signal output by the dac unit 200 is (R2+ R3+ R4)/(R1+ R2+ R3+ R4) × VADD(ii) a When the control unit 100 outputsWhen the digital PWM signal is at a high level, the voltage value of the voltage analog signal output by the digital-to-analog conversion unit 200 is 0V. Such a voltage analog signal varying regularly is loaded on the input terminal of the first filter unit 300, when the voltage analog signal output by the digital-to-analog conversion unit 200 is at a high level, the first capacitor C1 is charged through the second resistor R2, the voltage across the first capacitor C1 will rise due to the charging, and the potential of the common connection terminal between the first capacitor C1 and the second resistor R2 is related to the duration of the high level of the digital-to-analog conversion unit 200; when the voltage analog signal output by the dac unit 200 is at a low level, the first capacitor C1, the third resistor R3, and the fourth resistor R4 form a loop, the first capacitor C1 starts to discharge, and the discharge current is related to the energy accumulated in the original charging process, i.e. the duration of the high level of the dac unit 200. After the first capacitor C1 is charged and discharged in a cyclic manner, the voltage output at the common connection end between the third resistor R3 and the fourth resistor R4 is the dc level output of the first filter unit 300.
In this embodiment, the voltage value output by the power supply ADD, the resistances of the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 are all constant values, so that the charging voltage and the discharging current at the two ends of the first capacitor C1 will change along with the charging duration, that is, the magnitude of the dc level output by the first filtering unit 300 is related to the duration of the high level of the digital-to-analog converting unit 200, that is, related to the duty ratio of the digital PWM signal output by the control unit 100. By adjusting the duty ratio of the digital PWM signal output by the control unit 100, the first filtering unit 300 outputs a corresponding dynamic voltage value quickly.
Specifically, the adjusting unit 400 includes a second transistor Q2 and a fifth resistor R5, the fifth resistor R5 is disposed between the power supply ADD and the collector of the second transistor Q2, the base of the second transistor Q2 is connected to the output terminal of the first filtering unit 300 as the input terminal of the adjusting unit 400, and the emitter of the second transistor Q2 outputs a voltage signal as the output terminal of the adjusting unit 400.
In the bookIn an embodiment, the second transistor Q2 is preferably an NPN transistor. Since the first filter unit 300 continuously outputs the dc level signal, the second transistor Q2 continuously operates, and the second transistor Q2 operates in a current amplification state, so that the fifth resistor R5 determines the current value of the PN junction of the second transistor Q2. At this time, the voltage value output by the adjusting unit 400 is + V of the voltage value input by the first filtering unit 300BE(the voltage between the base and emitter of the second transistor Q2 is typically around 0.6V). The voltage output of the regulating unit 400 is dynamically adjustable as the voltage output of the whole voltage dynamic adjusting circuit, and is related to the duty ratio of the digital PWM signal output by the control unit 100; the duty ratio of the digital PWM signal output by the control unit 100 is adjusted to obtain the required voltage value.
Further, the voltage dynamic adjustment circuit further includes a second filtering unit 500, where the second filtering unit 500 includes a sixth resistor R6 and a second capacitor C2, and the sixth resistor R6 and the second capacitor C2 are connected in parallel between the output terminal of the adjustment unit 400 and ground.
The second filtering unit 500 is used for filtering the interference of the clutter signals, so that the voltage signal output by the adjusting unit 400 is stable and is not affected by other signals, i.e. the voltage dynamic adjusting circuit is stable and reliable when applied to the driving of the liquid crystal display.
Further, the voltage dynamic adjustment circuit further includes a seventh resistor R7 for current limiting, and the seventh resistor R7 is disposed between the output terminal of the control unit 100 and the input terminal of the digital-to-analog conversion unit 200.
The seventh resistor R7 is used for preventing the control unit 100 from outputting an overlarge current signal to break down the first triode Q1, so that the safety of electronic components in the circuit is ensured, and the service life of the circuit is prolonged.
The utility model also provides a liquid crystal display screen, which comprises the voltage dynamic adjusting circuit, wherein the voltage output by the voltage dynamic adjusting circuit is used for providing deflection voltage for the liquid crystal molecules of the liquid crystal display screen; the structure, the working principle and the advantageous effects of the voltage dynamic adjustment circuit are all referred to the above embodiments, and are not described herein again.
The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.
Claims (10)
1. A dynamic voltage adjustment circuit, comprising:
the control unit is used for outputting a digital PWM signal with adjustable duty ratio;
the input end of the digital-to-analog conversion unit is connected with the output end of the control unit and is used for converting the digital PWM signal output by the control unit into a corresponding analog signal;
the input end of the first filtering unit is connected with the output end of the digital-to-analog conversion unit and is used for filtering and converting the analog signal output by the digital-to-analog conversion unit into a direct-current level signal;
and the input end of the adjusting unit is connected with the output end of the first filtering unit and is used for dynamically adjusting and outputting the direct-current level signal output by the first filtering unit.
2. The voltage dynamic adjustment circuit according to claim 1, wherein the digital-to-analog conversion unit includes a power supply, a first transistor, and a first resistor, a base of the first transistor is used as an input terminal of the digital-to-analog conversion unit and is connected to an output terminal of the control unit, a collector of the first transistor is connected to an output terminal of the power supply through the first resistor, an emitter of the first transistor is grounded, and a common connection terminal between the collector of the first transistor and the first resistor is used as an output terminal of the digital-to-analog conversion unit and is connected to an input terminal of the first filtering unit.
3. The voltage dynamic adjustment circuit according to claim 2, wherein the first filtering unit includes a second resistor, a third resistor, a fourth resistor, and a first capacitor, one end of the second resistor is connected to the output terminal of the digital-to-analog conversion unit as the input terminal of the first filtering unit, the other end of the second resistor is connected to one end of the third resistor and one end of the first capacitor, the other end of the first capacitor is grounded, the other end of the third resistor is connected to one end of the fourth resistor, the other end of the fourth resistor is grounded, and a common connection end between the third resistor and the fourth resistor is connected to the adjustment unit as the output terminal of the first filtering unit.
4. The voltage dynamic adjustment circuit of claim 3, wherein the adjustment unit comprises a second transistor, a base of the second transistor is connected to the output terminal of the first filtering unit as the input terminal of the adjustment unit, a collector of the second transistor is connected to the output terminal of the power supply, and an emitter of the second transistor is used as the output terminal of the adjustment unit to output the voltage signal.
5. The voltage dynamics adjustment circuit of claim 4, wherein the regulation unit further comprises a fifth resistor disposed between a power supply and a collector of the second transistor.
6. The voltage dynamics adjustment circuit of claim 5, wherein the first transistor and the second transistor are both NPN transistors.
7. The dynamic voltage adjustment circuit of any one of claims 4-6, wherein the second transistor operates in a current amplification state.
8. The voltage dynamic adjustment circuit of claim 1, further comprising a second filtering unit, wherein the second filtering unit comprises a sixth resistor and a second capacitor, and the sixth resistor and the second capacitor are connected in parallel between the output terminal of the regulating unit and ground.
9. The voltage dynamic adjustment circuit of claim 2, further comprising a seventh resistor for current limiting, the seventh resistor being disposed between the output terminal of the control unit and the input terminal of the digital-to-analog conversion unit.
10. A liquid crystal display panel comprising the dynamic voltage adjustment circuit of any one of claims 1 to 8, wherein the dynamic voltage adjustment circuit outputs a voltage for providing a deflection voltage for liquid crystal molecules of the liquid crystal display panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920984671.4U CN210349266U (en) | 2019-06-27 | 2019-06-27 | Liquid crystal display screen and voltage dynamic adjusting circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920984671.4U CN210349266U (en) | 2019-06-27 | 2019-06-27 | Liquid crystal display screen and voltage dynamic adjusting circuit thereof |
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| Publication Number | Publication Date |
|---|---|
| CN210349266U true CN210349266U (en) | 2020-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920984671.4U Active CN210349266U (en) | 2019-06-27 | 2019-06-27 | Liquid crystal display screen and voltage dynamic adjusting circuit thereof |
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| CN (1) | CN210349266U (en) |
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Address after: 344000 first floor, Zhanghu medical building, Qianping Industrial Park, Le'an County, Fuzhou City, Jiangxi Province Patentee after: Jiangxi Yunzhi Yilian Technology Co.,Ltd. Address before: 344000 first floor, Zhanghu medical building, Qianping Industrial Park, Le'an County, Fuzhou City, Jiangxi Province Patentee before: Le'an Yunzhi Yi Lian Technology Co.,Ltd. |
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