Energy-saving LED display screen driven by double cathodes

Abstract

The energy-saving LED display screen comprises a double-negative-voltage power supply circuit, a signal amplification circuit and a detection circuit which are sequentially connected, the signal amplification circuit comprises a row scanning circuit and a column driving circuit which are respectively connected with the double-negative-voltage power supply circuit, the double-negative-voltage power supply circuit is used for generating and outputting a first negative voltage and a second negative voltage, and the detection circuit is used for detecting the first negative voltage and the second negative voltage. The first negative voltage is used for driving the row scanning circuit, and the second negative voltage is used for driving the column driving circuit; and the signal amplification circuit is connected with the double-negative-voltage power supply circuit and is used for receiving a negative-voltage signal output by the double-negative-voltage power supply circuit. According to the utility model, two different negative voltage signals are generated and output through the double negative voltage power supply circuit and are respectively used for driving the row scanning circuit and the column driving circuit, and meanwhile, the negative voltage output value is monitored in real time and dynamically adjusted through the detection circuit, so that the energy consumption is reduced, and the temperature control is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to LED display screen technical field, especially in a kind of double cathode drive's energy-saving LED display screen. BACKGROUND

[0002] Energy conservation, low-carbon life, it is the common vision of whole society.Meanwhile, it has given birth to the energy-saving environmental protection appeal of various application products and services, and LED display screen is more and more favored by the majority of terminal customers and operators with its high brightness, long life, wide viewing angle and other advantages.It is widely used in commercial display, meeting, performance, transportation and other fields, and has a huge consumption and application market.

[0003] With the continuous development of LED display technology, under the demand of virtual display, outdoor display and other applications, the traditional LED display screen circuit uses single voltage power supply under the traditional power design, which leads to low overall energy efficiency and high temperature problems, and high temperature environment has negative impact on the performance of LED display screen, especially in high brightness display, temperature rise makes display effect appear cyan and other problems. UTILIT Y MODEL CONTENT

[0004] The main purpose of the utility model is to provide a kind of double cathode drive's energy-saving LED display screen, to solve the problem of high energy consumption and high temperature of traditional LED display screen circuit.

[0005] To achieve the above purpose, the utility model provides a kind of double cathode drive's energy-saving LED display screen, it includes double negative voltage power supply circuit, signal amplification circuit, detection circuit connected in sequence, the signal amplification circuit includes the row scanning circuit, column drive circuit connected with the double negative voltage power supply circuit respectively, the double negative voltage power supply circuit is used to generate and output first negative voltage and second negative voltage, the first negative voltage is used to drive the row scanning circuit, the second negative voltage is used to drive the column drive circuit;

[0006] The signal amplification circuit is connected with the double negative voltage power supply circuit, is used to receive the negative voltage signal output by the double negative voltage power supply circuit, and the negative voltage signal is amplified and shaped;

[0007] The detection circuit is connected with the signal amplification circuit, is used to monitor the driving signal output by the signal amplification circuit in real time, and according to the monitoring result, feedback control signal is fed back to the double negative voltage power supply circuit, to dynamically adjust the output value of the first negative voltage and the second negative voltage.

[0008] In an embodiment, the energy-saving LED display screen further includes a step-down conversion module, the step-down conversion module is connected with the signal amplification circuit, digital signal is signal amplified through the signal amplification circuit, and the step-down conversion module is used to decode amplified digital signal.

[0009] In an embodiment, the energy-saving LED display screen further comprises a HUB module and a connector, the HUB module is connected with the signal amplification circuit, the amplified digital signal is input into the HUB module, and the HUB module transmits the amplified digital signal to the connector.

[0010] In an embodiment, the energy-saving LED display screen further comprises a filter circuit, the filter circuit is connected with the connector, and the filter circuit is used for inhibiting high-frequency noise.

[0011] In an embodiment, the filter circuit comprises an inductor and a first capacitor, one end of the inductor is connected with the connector, the other end of the inductor is connected with one end of the first capacitor, and the other end of the first capacitor is grounded.

[0012] In an embodiment, the signal amplification circuit comprises a bidirectional bus transceiver module, and the bidirectional bus transceiver module is connected with the row scanning circuit and the column driving circuit respectively.

[0013] In an embodiment, the chip model of the bidirectional bus transceiver module is 74HC245.

[0014] In an embodiment, the size of the first negative voltage is -2.8V to -3V.

[0015] In an embodiment, the size of the second negative voltage is -3.8V to -4V.

[0016] The utility model discloses a double negative voltage power supply circuit, signal amplification circuit, detection circuit are connected in sequence, wherein double negative voltage power supply circuit generates and exports two different negative voltage signals, is used for driving row scanning circuit and column driving circuit respectively, simultaneously through detection circuit real -time monitoring and dynamic adjustment negative voltage output value, has reduced energy consumption, has improved temperature control. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will briefly introduce the drawing needed to be used in the embodiment or prior art description, and obviously, the drawing in the following description is only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the structure shown in these drawings without paying creative labor.

[0018] Figure 1 It is energy-saving LED display screen schematic diagram;

[0019] Figure 2 It is the working principle diagram of row scanning circuit and column driving circuit;

[0020] Figure 3 is a common positive output schematic diagram;

[0021] Figure 4 is a detection circuit diagram;

[0022] Figure 5 is a row scanning circuit diagram;

[0023] Figure 6 is a bidirectional bus transceiver module circuit diagram;

[0024] Figure 7 is a connector circuit diagram;

[0025] Figure 8 is a column driving circuit diagram;

[0026] Figure 9 is an LED display screen circuit diagram;

[0027] Figure 10 is a signal amplification circuit diagram;

[0028] Figure 11 is a row signal decoding circuit diagram.

[0029] Brief Description of the Drawings:

[0030] 1, dual negative voltage power supply circuit; 2, signal amplification circuit; 3, detection circuit; 21, row scanning circuit; 22, column driving circuit; 4, voltage reduction conversion module; 5, HUB module; 6, connector; 7, filter circuit; LC1, inductor; CL1, first capacitor; 21, bidirectional bus transceiver module.

[0031] The realization, functional features and advantages of the utility model will be further described with reference to the drawings in combination with embodiments. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0033] It should be noted that if the embodiments of the utility model involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0034] In addition, if the description of "first", "second" and the like is involved in the embodiments of the utility model, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the same or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel schemes, taking "A and / or B" as an example, including A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the utility model.

[0035] The application provides a double-cathode driven energy-saving LED display screen.

[0036] In the embodiments of the utility model, as shown in Figure 1 、 Figure 4 、 Figure 9 The energy-saving LED display screen comprises double negative voltage power supply circuits 1, signal amplification circuits 2 and detection circuits 3 connected in sequence, the signal amplification circuit 2 comprises row scanning circuits 21 and column driving circuits 22 connected with the double negative voltage power supply circuit 1 respectively, the double negative voltage power supply circuit 1 is used for generating and outputting first negative voltage and second negative voltage, the first negative voltage is used for driving the row scanning circuit 21, and the second negative voltage is used for driving the column driving circuit 22.

[0037] The signal amplification circuit 2 is connected with the double negative voltage power supply circuit 1, is used for receiving the negative voltage signal output by the double negative voltage power supply circuit 1, and amplifies and shapes the negative voltage signal.

[0038] The detection circuit 3 is connected with the signal amplification circuit 2, is used for monitoring the driving signal output by the signal amplification circuit 2 in real time, and feeds back a control signal to the double negative voltage power supply circuit 1 according to the monitoring result, so as to dynamically adjust the output value of the first negative voltage and the second negative voltage.

[0039] The utility model discloses a double negative voltage power supply circuit 1, signal amplification circuit 2, detection circuit 3 that adopt in proper order are connected, wherein double negative voltage power supply circuit 1 generates and exports two different negative voltage signals, is used for driving line scanning circuit 21 and column drive circuit 22 respectively, simultaneously through detection circuit 3 real -time monitoring and dynamic adjustment negative voltage output value, has reduced energy consumption, has improved temperature control, and the energy -conserving LED display screen of adopting has reduced energy consumption effectively, and the embodiment supports up to 7680Hz refresh rate, ensures the smooth display of LED display screen. In the aspect of grey scale control, through 16 bit grey scale level adjustment, realize delicate color transition and performance, adopt the detection circuit 3 based on time sequence to carry out real -time monitoring to any exception in signal transmission process. In the working process of LED display screen, through the monitoring chip of special use to line signal, column signal and power voltage are monitored, ensure the normal operation of circuit, and detection circuit 3 built -in feedback mechanism can real -time feedback circuit failure and trigger alarm, and the maintenance personnel is handled in time.

[0040] As Figure 2 , Figure 5 , Figure 8 As shown in the drawing, the working current of the LED display screen flows into the R G B three color LED lamp from the positive pole of the lamp through the line scanning circuit 21, the column drive chip pin of the column drive circuit 22 is connected with the R G B lamp, the low level of the column drive chip constitutes a loop with the R G B lamp, and the column drive chip controls the brightness of the lamp by regulating the current. Since the power supply voltage of the line scanning circuit 21 is the same, and the low level of the loop constituted by the column drive circuit 22 is the same, the voltage drop of the line scanning circuit 21 and the R G B lamp is the same. However, the forward voltage drop of the red lamp is lower than that of the blue and green lamps, causing the loss of the red lamp to be higher than that of the blue and green lamps. Under normal circumstances, for high-brightness outdoor products, a voltage dividing resistor is connected in series with the red lamp to solve this problem. After the voltage dividing effect of the voltage dividing resistor, the forward voltage of the red lamp is reduced, and the loss of the red lamp is reduced. However, there is still loss on the red voltage dividing resistor. In order to completely solve this problem, a double negative voltage power supply is introduced. The power supply system adopts a double negative voltage power supply design, the positive pole is 0V, and the negative poles are -4V and -3V respectively. This voltage design can provide stable power supply for the drive chip. The double negative voltage design of the power supply can greatly reduce energy consumption and effectively reduce temperature rise. The high level of the double negative voltage power supply is GND, and the low levels are -3V and -4V respectively. The current flows from the line scanning circuit 21, passes through the red, green and blue lamps, and constitutes a loop with the low levels of the corresponding column drive chips. At this time, the low level voltage of the column drive voltage of the blue and green columns is -4V, and the low level voltage of the column drive voltage of the red column is -3V. The forward voltage drop of the red lamp is lower than that of the blue and green lamps, so that the loss caused by the excessively high voltage drop can be reduced without a voltage dividing resistor, thereby achieving the purpose of energy saving.

[0041] The energy-saving LED display screen also includes a step-down conversion module 4, which is connected to the signal amplification circuit 2. The digital signal is amplified by the signal amplification circuit 2, and the step-down conversion module 4 is used to decode the amplified digital signal.

[0042] like Figure 10 As shown, signal amplification circuit 2 amplifies the input digital signal to ensure sufficient signal strength. The on / off state of the signal is controlled by an SOP-16 transistor. Buck converter module 4 decodes the amplified signal to ensure it can be correctly recognized and processed by subsequent circuits. Through the cooperation of signal amplification circuit 2 and buck converter module 4, the technical problem of decoding the amplified digital signal is solved.

[0043] The buck converter module 4 can be implemented in various ways. For example, the buck converter module 4 can use a DC-DC buck converter of model RT5958, and the decoding of the amplified signal can be achieved by adjusting the input voltage, such as... Figure 11 As shown, the row signals are decoded by the buck converter module 4, controlling each row in the LED module sequentially. The color column signals are connected to the LED beads through a traditional column driver chip (ICND2153S) to achieve high-precision color control. The clock signal (CLK) is used for synchronous data transmission, and the latch signal (LAT) is used to latch the current row data to ensure data stability. Furthermore, the buck converter module 4 can also integrate a digital signal processor (DSP) or an application-specific integrated circuit (ASIC) to improve decoding speed and accuracy.

[0044] This embodiment introduces a step-down converter module 4, which, combined with the signal amplification circuit 2, enables effective decoding of the amplified digital signal. Compared with existing technologies, the technical solution of this application ensures that the signal maintains accuracy and stability during the decoding process after amplification, thereby improving the overall circuit reliability and performance.

[0045] The energy-saving LED display screen also includes a HUB module 5 and a connector 6. The HUB module 5 is connected to the signal amplification circuit 2. The amplified digital signal is input to the HUB module 5, and the HUB module 5 transmits the amplified digital signal to the connector 6. By adding the HUB module 5 and connector 6 to the energy-saving LED display screen, the amplified digital signal can be effectively transmitted to the connector 6, thereby achieving further signal processing and transmission.

[0046] The HUB module 5 is used to receive the amplified digital signal output by the signal amplification circuit 2 and transmit it to the connector 6. The HUB module 5 can be implemented in various ways, for example, a standard USB HUB chip or a dedicated signal distribution chip can be used to transmit the signal. The connector 6 can be a standard connection device for connecting with external devices to ensure stable transmission of the signal.

[0047] Thus, the embodiment effectively solves the problem of transmitting the amplified digital signal by adding the HUB module 5 and the connector 6, ensuring the stability and reliability of the signal. Compared with the prior art, the technical scheme of the present application can better realize further processing and transmission of the signal, improving the performance and reliability of the overall circuit.

[0048] As shown in Figure 7 The energy-saving LED display further includes a filter circuit 7 connected with the connector 6, and the filter circuit 7 is used to suppress high-frequency noise.

[0049] The energy-saving LED display suppresses high-frequency noise by adding the filter circuit 7. The filter circuit 7 is connected with the connector 6, so that the high-frequency noise generated during transmission can be effectively suppressed, thereby ensuring the stability of the signal and the clarity of the display effect. Through this technical means, the interference of high-frequency noise on the LED display circuit can be significantly reduced, and the overall performance and reliability of the display can be improved.

[0050] The filter circuit 7 includes an inductor LC1 and a first capacitor CL1. One end of the inductor LC1 is connected with the connector 6, the other end of the inductor LC1 is connected with one end of the first capacitor CL1, and the other end of the first capacitor CL1 is grounded. The filter circuit 7 can effectively eliminate high-frequency noise. The combination of the inductor LC1 and the first capacitor CL1 can effectively suppress high-frequency noise, ensuring the stability of the circuit and the integrity of the signal.

[0051] The combination of the inductor LC1 and the first capacitor CL1 can adopt different parameters and specifications to adapt to different application scenarios. For example, the inductance of the inductor LC1 and the capacitance of the first capacitor CL1 can be adjusted according to actual needs to achieve the best filtering effect. As a preferred embodiment, the inductance of the inductor LC1 can be selected between 10μH and 100μH, and the capacitance of the first capacitor CL1 can be selected between 10nF and 100nF. In addition, the materials and packaging forms of the inductor LC1 and the first capacitor CL1 can also be selected according to specific applications, for example, high-Q inductors and low-ESR capacitors can be selected to improve the filtering effect and reliability.

[0052] This embodiment effectively addresses the impact of high-frequency noise on the circuit by introducing a filter circuit 7 into the energy-saving LED display screen, thereby improving circuit stability and signal integrity. By adding the filter circuit 7, this embodiment effectively suppresses the influence of high-frequency noise on the LED display screen circuit, ensuring signal stability and display clarity.

[0053] like Figure 6 As shown, the signal amplification circuit 2 includes a bidirectional bus transceiver module 21, which is connected to the row scanning circuit 21 and the column driving circuit 22 respectively.

[0054] The bidirectional bus transceiver module 21 in the signal amplification circuit 2 is used to realize the effective transmission of signals between the row scanning circuit 21 and the column driving circuit 22. For example... Figure 3 As shown, the bidirectional bus transceiver module 21 enables signal transmission in different directions, ensuring that the signal amplification circuit 2 can effectively connect and transmit signals with the row scanning circuit 21 and the column driving circuit 22, thereby improving the stability and reliability of signal transmission. In this way, the signal transmission problem between the signal amplification circuit 2 and the row scanning circuit 21 and column driving circuit 22 is solved, ensuring the normal operation of the LED display screen.

[0055] The bidirectional bus transceiver module 21 can be implemented in various ways. For example, the 74HC245 chip can be used as the bidirectional bus transceiver module 21. This chip features high transmission rate and low power consumption, enabling efficient bidirectional signal transmission. Furthermore, the bidirectional bus transceiver module 21 can also be implemented using other types of transceiver chips, as long as the signal transmission requirements are met. Specifically, the bidirectional bus transceiver module 21 can be implemented through hardware circuit design or controlled through software programming to adapt to the needs of different application scenarios.

[0056] This embodiment introduces a bidirectional bus transceiver module 21 into the signal amplification circuit 2, realizing bidirectional signal transmission between the row scanning circuit 21 and the column driving circuit 22, thereby effectively solving the signal transmission problem. Compared with the prior art, the solution of this application improves the stability and reliability of signal transmission, ensuring the normal operation of the LED display screen. Therefore, this application not only solves the signal transmission problem but also improves the overall performance of the LED display screen.

[0057] The bidirectional bus transceiver module 21 uses a 74HC245 chip. The selection of this chip model played a crucial role in resolving the specific implementation issues of the bidirectional bus transceiver module 21. By employing the 74HC245 chip, the stability and reliability of the bidirectional bus transceiver module 21 can be ensured, thereby effectively realizing bidirectional signal transmission and amplification, and meeting the high-efficiency and high-precision display requirements of the LED display screen.

[0058] The 74HC245 chip is a commonly used bidirectional bus transceiver with low power consumption, high speed and high anti-interference capability. Specifically, the 74HC245 chip can realize bidirectional transmission of data in different working modes, support bidirectional communication and data isolation function of the bus. By reasonably configuring the control end of the chip, the direction and state of data transmission can be flexibly controlled. In addition, the 74HC245 chip internally integrates a level conversion circuit, which can realize compatibility between circuits of different voltage levels, thereby improving the flexibility and adaptability of system design. As a preferred embodiment, multiple 74HC245 chips can be used in parallel in the bidirectional bus transceiver module 21 to further improve the speed and stability of data transmission. By using the 74HC245 chip, the bidirectional bus transceiver module 21 in the present application has been significantly improved in terms of signal transmission stability, reliability and anti-interference capability.

[0059] The first negative voltage has a magnitude of -2.8V to -3V. The second negative voltage has a magnitude of -3.8V to -4V. By setting the negative voltage range, it is ensured that the first negative voltage and the second negative voltage of the driving circuit operate within a stable range, thereby improving the stability and reliability of the driving circuit.

[0060] The magnitude of the first negative voltage and the second negative voltage can be realized by a precise voltage regulator. Specifically, a high-precision negative voltage power module can be used, which can provide stable negative voltage output, ensuring that the first negative voltage is within the range of -2.8V to -3V and the second negative voltage is within the range of -3.8V to -4V. As a preferred embodiment, the first negative voltage of the present embodiment is selected as -3V, and the second negative voltage is selected as -4V. A negative voltage power module with automatic adjustment function can also be used, which can automatically adjust the output voltage according to the actual demand, further improving the stability of the driving circuit. In addition, a filter circuit 7 can also be added to the circuit to suppress possible voltage fluctuations and ensure stable negative voltage output.

[0061] The utility model also proposes a kind of LED display screen, including the energy-saving LED display screen. First negative voltage and second negative voltage are provided to drive row scanning circuit 21 and column driving circuit 22 respectively, to improve power supply efficiency and reduce energy consumption. At the same time, the stability of the driving signal is ensured by amplifying and shaping the negative voltage signal through signal amplification circuit 2, and then the display effect is improved. In addition, detection circuit 3 is used to monitor driving signal in real time, and dynamically adjusts negative voltage output to ensure that LED display screen can maintain good performance under different working conditions.

[0062] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications, combinations and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. An energy-saving LED display screen driven by dual cathodes, characterized in that, The device includes a dual negative voltage power supply circuit, a signal amplification circuit, and a detection circuit connected in sequence. The signal amplification circuit includes a row scanning circuit and a column driving circuit respectively connected to the dual negative voltage power supply circuit. The dual negative voltage power supply circuit is used to generate and output a first negative voltage and a second negative voltage. The first negative voltage is used to drive the row scanning circuit, and the second negative voltage is used to drive the column driving circuit. The signal amplification circuit is connected to the dual negative voltage power supply circuit and is used to receive the negative voltage signal output by the dual negative voltage power supply circuit, and to amplify and shape the negative voltage signal. The detection circuit is connected to the signal amplification circuit and is used to monitor the drive signal output by the signal amplification circuit in real time, and to feed back control signals to the dual negative voltage power supply circuit according to the monitoring results, so as to dynamically adjust the output values ​​of the first negative voltage and the second negative voltage.

2. The energy-saving LED display screen as described in claim 1, characterized in that, The energy-saving LED display screen also includes a step-down conversion module, which is connected to the signal amplification circuit. The digital signal is amplified by the signal amplification circuit, and the step-down conversion module is used to decode the amplified digital signal.

3. The energy-saving LED display screen as described in claim 2, characterized in that, The energy-saving LED display screen also includes a HUB module and connectors. The HUB module is connected to the signal amplification circuit. The amplified digital signal is input to the HUB module, and the HUB module transmits the amplified digital signal to the connectors.

4. The energy-saving LED display screen as described in claim 3, characterized in that, The energy-saving LED display screen also includes a filtering circuit, which is connected to the connector and is used to suppress high-frequency noise.

5. The energy-saving LED display screen as described in claim 4, characterized in that, The filter circuit includes an inductor and a first capacitor. One end of the inductor is connected to the connector, and the other end of the inductor is connected to one end of the first capacitor, which is grounded.

6. The energy-saving LED display screen as described in claim 1, characterized in that, The signal amplification circuit includes a bidirectional bus transceiver module, which is connected to the row scanning circuit and the column driving circuit respectively.

7. The energy-saving LED display screen as described in claim 6, characterized in that, The bidirectional bus transceiver module uses a 74HC245 chip.

8. The energy-saving LED display screen as described in claim 1, characterized in that, The magnitude of the first negative voltage is -2.8V to -3V.

9. The energy-saving LED display screen as described in claim 1, characterized in that, The magnitude of the second negative voltage is -3.8V to -4V.

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