CN109754747B - Integrated LED driving circuit structure and corresponding LED display system - Google Patents
Integrated LED driving circuit structure and corresponding LED display system Download PDFInfo
- Publication number
- CN109754747B CN109754747B CN201711058808.5A CN201711058808A CN109754747B CN 109754747 B CN109754747 B CN 109754747B CN 201711058808 A CN201711058808 A CN 201711058808A CN 109754747 B CN109754747 B CN 109754747B
- Authority
- CN
- China
- Prior art keywords
- driving circuit
- led
- circuit module
- display device
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
Abstract
The application relates to an integrated LED driving circuit structure and a corresponding LED display system, wherein the LED display system with the integrated LED driving circuit structure also comprises an LED display control module and an LED display device, the integrated LED driving circuit structure comprises an LED tube driving circuit module and a dynamic driving circuit module, the LED tube driving circuit module is connected with the dynamic driving circuit module, the working mode of the integrated LED driving circuit structure can be switched according to the common end polarity of an external LED display device, and the display brightness of the external LED display device is consistent under all display conditions. The integrated LED driving circuit structure and the corresponding LED display system adopting the structure have low cost and good flexibility.
Description
Technical Field
The application relates to the field of electronic device driving, in particular to the field of LED tube driving, and specifically relates to an integrated LED driving circuit structure and a corresponding LED display system.
Background
The application of LED tubes is becoming more and more widespread, for example, LED nixie tube display devices or LED dot matrix display devices are used to display information in application schemes of many electronic products. In the prior art, a triode outside a driving integrated circuit is adopted to drive a public end of an LED nixie tube display device or an LED lattice display device. There are 2 disadvantages to the prior art:
each nixie tube in the LED nixie tube display device needs a triode and a base current limiting resistor of the triode to increase the purchase cost and the processing cost of the element;
the type of the LED nixie tube display device on the LED display system can only be fixed as one of a common cathode nixie tube or a common anode nixie tube and cannot be interchanged.
Taking an example of driving an LED nixie tube display device with 4 common-cathode LED nixie tubes, as shown in fig. 1, the solution of the prior art is that cathodes COM 1-COM 4 of the four common-cathode LED nixie tubes are driven by four triodes Q1-Q4, and bases of the four triodes Q1-Q4 are connected to one ends of four base current limiting resistors R11-R14. The other ends of the four base current limiting resistors R11-R14 are connected to the driving integrated circuit. Eight ports a, b, c, d, e, f, g and dp of the four supply LED nixie tubes are respectively connected with one ends of eight current limiting resistors R1-R8. The other ends of the eight current limiting resistors R1-R8 are connected with a driving integrated circuit.
According to the scheme in the prior art, the triodes Q1-Q4 and the base current limiting resistors R11-R14 of the triodes are needed outside the LED driving circuit structure, so that the cost of the scheme is increased. If the common anode LED nixie tube is to be driven, the type of the triode needs to be changed into a PNP type triode and the emitter connection point of the triode needs to be changed into VDD, which means that the wiring of the PCB in the LED display system needs to be modified, therefore, the existing technical scheme has high cost, single driving mode and no flexibility.
The disadvantage of the prior art is that the integrated LED driving circuit structure requires a triode to drive the common cathode LED nixie tube or the common anode LED nixie tube, which has the disadvantages of high cost and low flexibility.
Disclosure of Invention
The application aims to overcome the defects of the prior art and provide an integrated LED driving circuit structure with lower cost and wider application range and a corresponding LED display system.
In order to achieve the above object, the integrated LED driving circuit structure and the corresponding LED display system of the present application have the following constitution:
the integrated LED driving circuit structure comprises an LED tube driving circuit module and a dynamic driving circuit module, wherein:
the LED tube driving circuit module is used for receiving corresponding level control signals and common anode and common cathode control signals, converting the corresponding level control signals into corresponding first driving current signals and outputting the corresponding first driving current signals to corresponding gating ends in an external LED display device, judging the polarity of a common end of the external LED display device according to the common anode and common cathode control signals, switching the working mode of the integrated LED driving circuit structure into a common cathode control mode, a common anode control mode or a common cathode and common anode coexistence control mode, and providing dynamic driving signals for the dynamic driving circuit module;
the dynamic driving circuit module is correspondingly connected with the LED tube driving circuit module, and is used for receiving the corresponding COM output enabling signal, outputting the corresponding second driving current signal to the corresponding public end in the external LED display module, and enabling the display brightness of the external LED display device to be consistent under all display conditions according to the dynamic driving signal.
The LED display system with the integrated LED drive circuit structure is mainly characterized by further comprising an LED display control module and an LED display device;
the LED display control module is correspondingly connected with the LED tube driving circuit module and the dynamic driving circuit module respectively, and is used for sending the corresponding level control signal and the common anode and common cathode control signal to the LED tube driving circuit module and sending the corresponding COM output enabling signal to the dynamic driving circuit module;
the LED display device is provided with N gating ends and M public ends, the N gating ends are correspondingly connected with the LED tube driving circuit module, and the M public ends are correspondingly connected with the dynamic driving circuit module and are used for displaying corresponding characters according to the first driving current signal and the second driving current signal;
wherein N is more than or equal to 1, and M is more than or equal to 1.
The integrated LED driving circuit structure and the corresponding LED display system are adopted, an external triode is not required, the working mode of the integrated LED driving circuit structure can be switched into a common cathode control mode, a common anode control mode or a common cathode and common anode coexistence control mode according to the polarity of a public end of an external LED display device, and the dynamic driving circuit module can adjust driving capability according to the number of the lighted LED tubes, so that the display brightness of the external LED display device is consistent under all display conditions, and the integrated LED driving circuit structure has the characteristics of low cost and high flexibility.
Drawings
Fig. 1 is a schematic diagram of an application of an integrated LED driving circuit structure of the prior art.
Fig. 2 is a schematic diagram of an integrated LED driving circuit structure according to an embodiment of the present application.
Fig. 3 is a schematic diagram of a 4-bit co-cathode LED nixie tube.
Fig. 4 is a schematic diagram of a 4-bit common anode LED nixie tube.
Fig. 5 is a schematic diagram of the on state of the common cathode LED nixie tube.
Fig. 6 is a schematic diagram of a two-stage lighting state of the common-cathode LED nixie tube.
Fig. 7 is a schematic diagram of an integrated LED driving circuit structure and an LED display device according to an embodiment of the LED display system of the present application.
Fig. 8 is a first application circuit diagram of an integrated LED driving circuit structure and LED display device in an embodiment of the LED display system of the present application.
Fig. 9 is a circuit diagram of a second application of the LED display device and an integrated LED driving circuit structure in an embodiment of the LED display system of the present application.
Detailed Description
In order to more clearly describe the technical contents of the present application, a further description will be made below in connection with specific embodiments.
The implementations described in the following exemplary examples do not represent all implementations consistent with the application. Rather, they are merely examples of apparatus and methods consistent with aspects of the application as detailed in the accompanying claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Embodiments of the present application are described in detail below with reference to the accompanying drawings.
The integrated LED driving circuit structure of the present application and the corresponding integrated LED driving circuit structure in an LED display system,
the LED display system with the integrated LED driving circuit structure comprises an LED display control module and an LED display device, wherein the LED display control module is connected with the LED display device;
the LED display control module is correspondingly connected with the LED tube driving circuit module and the dynamic driving circuit module respectively, and is used for sending the corresponding level control signal and the common anode and common cathode control signal to the LED tube driving circuit module and sending the corresponding COM output enabling signal to the dynamic driving circuit module;
the LED display device is provided with N gating ends and M public ends, the N gating ends are correspondingly connected with the LED tube driving circuit module, and the M public ends are correspondingly connected with the dynamic driving circuit module and are used for displaying corresponding characters according to the first driving current signal and the second driving current signal;
wherein N is more than or equal to 1, and M is more than or equal to 1.
The integrated LED driving circuit structure comprises an LED tube driving circuit module and a dynamic driving circuit module, wherein:
the LED tube driving circuit module is used for receiving a corresponding level control signal and a common anode and common cathode control signal, converting the corresponding level control signal into a corresponding first driving current signal, outputting the corresponding first driving current signal to a corresponding gating end in an external LED display device, judging the polarity of a common end of the external LED display device according to the common anode and common cathode control signal, switching the working mode of the integrated LED driving circuit structure into a common cathode control mode, a common anode control mode or a common cathode and common anode coexistence control mode, and providing a dynamic driving signal for the dynamic driving circuit module;
the dynamic driving circuit module is correspondingly connected with the LED tube driving circuit module, and is used for receiving the corresponding COM output enabling signal, outputting the corresponding second driving current signal to the corresponding public end in the external LED display module, and enabling the display brightness of the external LED display device to be consistent under all display conditions according to the dynamic driving signal.
In the above embodiment, the LED display system further includes N current limiting resistors, and the LED tube driving circuit module is correspondingly connected to N gate ends of the LED display device through the N current limiting resistors.
In the above embodiment, the LED tube driving circuit module includes:
the system comprises N level control signal input ends, wherein each level control signal input end is used for receiving a corresponding level control signal;
each first driving current signal output end is used for outputting a corresponding first driving current signal obtained by converting a corresponding level control signal to a corresponding gating end in an external LED display device;
the common anode and common cathode control end is used for receiving a common anode and common cathode control signal, judging the polarity of the common end according to the external LED display device according to the common anode and common cathode control signal, and switching the working mode of the integrated LED drive circuit structure into a common cathode control mode, a common anode control mode or a common cathode and common anode coexistence control mode;
the dynamic driving signal output end is correspondingly connected with the dynamic driving circuit module and is used for providing dynamic driving signals for the dynamic driving circuit module;
wherein N is the number of corresponding gates in the external LED display device.
In the above embodiment, the dynamic driving circuit module includes:
m dynamic driving circuit units, which are connected in series,
each dynamic driving circuit unit comprises a dynamic driving signal input end, a COM output enabling end and a COM output control end;
wherein M is the number of corresponding control ends in the external LED display device;
the dynamic driving signal input end is correspondingly connected with the dynamic driving signal output end in the LED tube driving circuit module and is used for enabling the display brightness of the external LED display device to be consistent under all display conditions according to the dynamic driving signal;
the COM output enabling end is used for receiving the corresponding COM output enabling signal;
the COM output control end is used for outputting a corresponding second driving current signal to a corresponding public end in the external LED display module.
In the above embodiment, the LED tube driving circuit module further includes N xor gate units, where each xor gate unit includes a first input terminal, a second input terminal, and a first output terminal;
the first input ends are all used as corresponding level control signal input ends and are used for receiving corresponding level control signals;
the second input end is used as a common anode and common cathode control end and is used for receiving a common anode and common cathode control signal, judging the polarity of the common end of the external LED display device according to the common anode and common cathode control signal, and switching the working mode of the integrated LED drive circuit structure into a common cathode control mode, a common anode control mode or a common cathode and common anode coexistence control mode;
the first output ends are used as corresponding first driving current signal output ends and are used for outputting corresponding first driving current signals obtained by converting corresponding level control signals to corresponding gating ends in the external LED display device;
and the first input end and the first output end form the dynamic driving signal output end which is correspondingly connected with the dynamic driving circuit module and is used for providing dynamic driving signals for the dynamic driving circuit module.
In the above embodiment, the dynamic driving circuit unit further includes N dynamic driving circuit sub-units,
wherein each dynamic driving circuit subunit comprises an AND gate and a tri-state driver;
the AND gate comprises a third input end, a fourth input end and a second output end;
the tri-state driver comprises a fifth input end, a sixth input end and a third output end;
the third input end is used as the COM output enabling end and is used for receiving the corresponding COM output enabling signal;
the second output end is connected with the fifth input end;
the fourth input end and the sixth input end form the dynamic driving signal input end together and are connected with the LED tube driving circuit module, wherein the fourth input end is connected with the first input end of the corresponding exclusive-OR gate unit in the LED tube driving circuit module, and the sixth input end is connected with the first output end of the corresponding exclusive-OR gate unit in the LED tube driving circuit module;
the third output end is used as the COM output control end and is used for outputting a corresponding second driving current signal to a corresponding public end in the external LED display module.
In the above embodiment, the dynamic driving circuit module includes:
m dynamic driving circuit units, which are connected in series,
each dynamic driving circuit unit comprises a dynamic driving signal input end, a COM output enabling end and a COM output control end;
wherein M is the number of corresponding control ends in the external LED display device;
the dynamic driving signal input end is correspondingly connected with the dynamic driving signal output end in the LED tube driving circuit module and is used for enabling the display brightness of the external LED display device to be consistent under all display conditions according to the dynamic driving signal;
the COM output enabling end is used for receiving a corresponding COM output enabling signal;
the COM output control end is used for outputting a corresponding second driving current signal to a corresponding public end in the external LED display module.
In the above embodiment, the dynamic driving circuit unit further includes N dynamic driving circuit subunits, where N is the number of corresponding strobe ends in the external LED display device;
wherein each dynamic driving circuit subunit comprises an AND gate and a tri-state driver;
the AND gate comprises a third input end, a fourth input end and a second output end;
the tri-state driver comprises a fifth input end, a sixth input end and a third output end;
the third input end is used as the COM output enabling end and is used for receiving the corresponding COM output enabling signal;
the second output end is connected with the fifth input end;
the fourth input end and the sixth input end together form the dynamic driving signal input end to be connected with the LED tube driving circuit module, wherein the fourth input end is connected with the first input end of the corresponding exclusive OR gate unit in the LED tube driving circuit module, and the sixth input end is connected with the first output end of the corresponding exclusive OR gate unit in the LED tube driving circuit module;
the third output end is used as the COM output control end for outputting a corresponding second driving current signal to a corresponding public end in the external LED display module.
The following description will be made with reference to drawings of some embodiments, taking a 4-bit LED nixie tube display device as an example, to describe some structures and principles of the present application.
In this embodiment, the number of common terminals of the 4-bit LED nixie tube display device is 4, namely COM1, COM2, COM3 and COM4, and the number of the gating terminals is 8, namely a, b, c, d, e, f, dp, respectively, in order to make the expression more vivid, the pen segment "a" data, the pen segment "b" data, the pen segment "c" data, the pen segment "d" data, the pen segment "e" data, the pen segment "f" data and the pen segment "dp" data are respectively used for representing the level control signals input by the corresponding 8 level control signal input terminals in the LED nixie tube display device, respectively, inputting first driving current signals to the gating terminals a, b, c, d, e, f, d in the LED nixie tube display device, respectively, inputting second driving current signals to the four common terminals of COM1, COM2, COM3 and COM4 by the 4 dynamic driving circuit units, and in order to describe the expression more vivid, the LED nixie tube driving circuit module is used for representing the level control signals respectively driving different segments in the LED nixie tube display device, namely the LED nixie tube display device has the LED nixie tube display device with the same number as the LED nixie tube display device;
as shown in fig. 2, the integrated LED driving circuit structure 100 of the present application has a dynamic adjustment driving module (including an LED tube driving circuit module and a dynamic driving circuit module) 101 therein, and the LED nixie tube display device is directly driven by the dynamic adjustment driving module 101 inside the integrated LED driving circuit structure, so that the external driving transistor and the base current limiting resistor thereof of the integrated LED driving circuit structure are omitted, and the cost is reduced. Furthermore, the driven LED nixie tube display device in the technical scheme of the application can be a common anode LED nixie tube display device or a common cathode LED nixie tube display device, or the common anode LED nixie tube display device and the common cathode LED nixie tube display device are driven simultaneously, so that the display device is flexible and convenient.
Taking a 4-bit LED nixie tube as an example, the principles of the common-cathode LED nixie tube and the common-anode LED nixie tube are respectively shown in fig. 3 and 4, wherein fig. 3 is a display schematic diagram of the common-cathode nixie tube, fig. 4 is a display schematic diagram of the common-cathode anode nixie tube, and the nixie tubes 1-4 are four independent LED nixie tubes. Each independent nixie tube is composed of 8 LED tubes, and is called a common-cathode LED nixie tube if cathodes of the 8 LED tubes are connected, and is called a common-anode LED nixie tube if anodes of the 8 LED tubes are connected.
The LED nixie tube is provided with a common anode or cathode, and the driving requirement of the common electrode of the LED nixie tube display device is analyzed by using the driving of the common cathode LED nixie tube. Fig. 5 is a schematic diagram of the nixie tube displaying the number "1", fig. 6 is a schematic diagram of the nixie tube displaying the number "8", the anode resistance of each LED in the figure is the same, only two pen segments (i.e. LED tubes) of "b" and "c" are lighted when the LED nixie tube display device displays "1", and all eight pen segments are lighted when the LED nixie tube display device displays "8". In both cases of display "1" and display "8", in order to achieve uniform display brightness for each pen segment, it is necessary to ensure that the current flowing through each pen segment is the same, which requires that the levels of com_1 and com_2 be equal. If the common electrode of the LED nixie tube is driven by a triode, the triode has smaller internal resistance under the saturated state, namely, the resistance values of RCOM_1 and RCOM2 are smaller, and even if the current phase difference is 4 times under the two conditions of displaying 1 and 8, the level of COM_1 and COM_2 can be basically equal, so that the current values of all displayed pen sections are basically equal, and the display brightness is basically consistent. The current driving capability of the output pin of the integrated circuit is smaller, namely the equivalent resistance is larger, the resistance value of the equivalent resistances rcom_1 and rcom_2 is larger corresponding to fig. 5 and 6, the current flowing through rcom_1 is larger than the current flowing through rcom_2, the voltage of rcom_1 is higher than the voltage of rcom_2, the current of each pen section in the LED nixie tube displaying 8 is smaller, the brightness is lower, and the current of each pen section in the LED nixie tube displaying 1 is larger, the brightness is higher, and the contrast of the two influences the display effect.
As shown in fig. 7, taking a 4-bit LED code tube module as an example, 8 pen segment data are input to a pen segment driving circuit module 1012 (i.e., an LED tube driving circuit module), output signals a, b, c, d, e, f, g, dp of the pen segment driving circuit module 1012 are respectively connected with one ends of current limiting resistors R1 to R8 outside the circuit, and the other ends of R1 to R8 are connected with a, b, c, d, e, f, g, dp ports of the LED nixie tube. The common positive common negative control signal input to the pen segment driver circuit module 1012 (i.e., the LED tube driver circuit module in the integrated LED driver circuit structure) is used to select whether the external LED digital tube display device is common anode or common cathode. For the common anode LED nixie tube display device, the displayed pen section outputs a low level, and the non-displayed pen section outputs a high level; for the common cathode LED nixie tube display device, the displayed pen segment outputs a high level, and the non-displayed pen segment outputs a low level. The four control signals of COM1 output enable, COM2 output enable, COM3 output enable and COM4 output enable alternately output high level, are used for controlling the 4 LED nixie tube display devices to display in a time-sharing mode, and only one COMn (n represents any natural number of 1-4) output enable signal is high level at the same time, and the rest is low level. The dynamic driving circuit unit 1011 dynamically adjusts the driving capability according to the number of the pen segments to be lighted currently, so that the driving current of each pen segment is the same under all display conditions, thereby achieving the purpose of consistent display brightness.
The pen segment driving circuit module (i.e. LED tube driving circuit module) 1012 and the dynamic driving circuit unit 1011 in the present application are shown in fig. 8. The pen segment driving circuit module 1012 has the functions of outputting a low level when the levels of two input ends of the exclusive-or gate are the same, and outputting a high level when the levels of the two input ends of the exclusive-or gate are different, wherein I1 to I8 are exclusive-or gate (XOR) circuits. The outputs of I1-I8 respectively drive a, b, c, d, e, f, g, dp pen sections of the LED nixie tube display device, corresponding input pen section data signals, namely the corresponding level control signals are lighted when being 1, and input pen section data signals, namely the corresponding level control signals are not lighted when being 0. The action of the common-yang common-yin control signal is described by the illumination of pen segment "a": when the pen section 'a' needs to be lightened, a data signal of the input level control signal pen section 'a' is 1, if the common cathode LED nixie tube display device is used, the common anode and common cathode control signal is 1, the I1 outputs 1, and the pen section 'a' is lightened; if the common anode LED nixie tube display device is adopted, the common anode and common cathode control signals are set to be 0, the I1 outputs 0, and the pen section a is lighted. Conversely, if the pen segment "a" data is "0", then the pen segment "a" will not be lit in both cases.
The operation principle of the dynamic driving circuit unit 1011 is described below. Referring to fig. 8, the dynamic driving circuit unit 1011 drives the common terminal of the LED nixie tube display device, and corresponds to the data signals of a, b, c, d, e, f, g, dp eight pen segments, the dynamic driving circuit unit 1011 has eight t_bufs (tri-state drivers), and the output polarities of the t_bufs are opposite to the input data signals. When a certain pen segment data signal is '1', the corresponding T_BUF is turned on, and when a certain pen segment data signal is '0', the corresponding T_BUF is turned off, and the output end is in a high resistance state. Therefore, when in display, the dynamic driving circuit dynamically controls the opening quantity of the T_BUF according to the numerical value of the eight pen segments display data, so that the quantity of the T_BUF at the COM end of the LED nixie tube display device is the same as the quantity of the lighted pen segments, namely, the driving capability of the COM port is matched with the quantity of the lighted pen segments, the current value of each pen segment is the same when different data are displayed, and the high-quality display effect is achieved. The COM output enable signal in the dynamic driving circuit unit 1011 is used to control the operation of all eight t_bufs, when the COM output enable signal is "0", the output of the and gates I21 to I28 is all "0", the eight t_bufs are disabled from being output, the output terminal is in a high-impedance state, and only when the COM output enable signal is not "0", the eight t_bufs are turned on or off according to the eight pen segment data, which is used for the time-sharing driving control of the plurality of nixie tubes.
The following describes the operation of the pen segment driving circuit module 1012 and the dynamic driving circuit unit 011 by taking a nixie tube display character "1" as an example. Referring to fig. 8, the data of the pen segment "b" and the data of the pen segment "c" are "1" when the character "1" is displayed, and the data of the other six pen segments are "0". Assuming that the common-cathode LED nixie tube display device is driven, the common-anode and common-cathode control end inputs a signal of '0' for common-anode and common-cathode control, I2 and I3 in eight exclusive-OR gates output high level, and the other six exclusive-OR gates output low level. At this time, in the dynamic driving circuit unit 1011, "COM output enable" is at a high level, and the input signals of the and circuits I22 and I23 are both at a high level, so that I12 and I13 in the t_buf are turned on, and the COM signal outputted to the driving of the common terminal of the LED digital tube display device is outputted, so that the common terminal (i.e., COM terminal) of the LED digital tube display device is driven to a low level. As described above, when the exclusive or gates I2 and I3 output a high level and the common terminal of the LED nixie tube display device inputs a low level, the pen segments "b" and "c" of the common cathode LED nixie tube display device are lighted, and the character "1" is displayed. Similarly, if the common anode LED nixie tube display device is driven, the input signal "common anode and common cathode control" is "1", the exclusive or gates I2 and I3 output a low level, and the common terminal (COM terminal) of the LED nixie tube display device inputs a high level, so that the pen segments "b" and "c" of the common cathode LED nixie tube display device are lighted, and the character "1" is displayed.
Taking driving 4 LED nixie tube display devices as an example, one embodiment of the present application is shown in fig. 9. The four LED nixie tube display devices can be common cathode LED nixie tube display devices or common anode LED nixie tube display devices, the four LED nixie tube display devices are lightened in a time-sharing mode, only one LED nixie tube display device is lightened at the same time, and four signals of COM1 output enable, COM2 output enable, COM3 output enable and COM4 output enable alternately output high levels to select and drive one nixie tube.
In a specific embodiment of the application, four LED nixie tube display devices can be driven, but the number of the LED nixie tube display devices is not limited to 4, and the number of the LED nixie tube display devices can be easily increased or reduced according to the COM end time division multiplexing principle so as to adapt to different application system schemes; in a specific embodiment of the application, an LED nixie tube display device is adopted, and if the LED dot matrix display device is to be driven, the integrated LED driving circuit structure of the application is only required to be connected with the corresponding gate end and the common end of the LED dot matrix display device.
Compared with the prior art, the application has the following advantages in the circuit for driving the LED nixie tube display device:
advantage 1: the COM end driving circuit is built-in, so that a peripheral driving triode and a current limiting resistor for protecting the driving triode are omitted.
Advantage 2: the common-cathode LED nixie tube display device or the common-anode LED nixie tube display device can be driven, even 2 types of LED nixie tube display devices are driven simultaneously, the nixie tubes in the LED nixie tube display device are effective in time sharing (taking a 4-bit LED nixie tube display device as an example, 4 nixie tubes are lighted in turn), and only the corresponding common-anode and common-cathode control signals are output to different nixie tubes in the corresponding LED nixie tube display device in turn.
Advantage 3: the dynamic driving circuit is adopted, and when the same LED nixie tube display device displays different characters or each pen section in the adjacent LED nixie tube display device has the same current, the display brightness is consistent.
In the prior art, although a method for directly driving a digital tube COM end can be realized by using a common MCU IO port, the output driving capability of the MCU IO port is weak and uncontrollable, the driving capability cannot be adjusted when the number of display pen sections is different, the current of each pen section is large when the number of the display pen sections is small, and the current of each pen section is small when the number of the display pen sections is large, so that the brightness of the pen sections is inconsistent under the two conditions, and the display effect is not good as compared with the scheme of the application.
The integrated LED driving circuit structure and the corresponding LED display system are adopted, an external triode is not required, the working mode of the integrated LED driving circuit structure can be switched into a common cathode control mode, a common anode control mode or a common cathode and common anode coexistence control mode according to the polarity of a public end of an external LED display device, and the dynamic driving circuit module can adjust driving capability according to the number of the lighted LED tubes, so that the display brightness of the external LED display device is consistent under all display conditions, and the integrated LED driving circuit structure has the characteristics of low cost and high flexibility.
Those skilled in the art will appreciate that the drawing is merely a schematic representation of one preferred embodiment and that the modules or processes in the drawing are not necessarily required to practice the application. The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily appreciate variations or alternatives within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. The integrated LED driving circuit structure is characterized by comprising an LED tube driving circuit module and a dynamic driving circuit module, wherein:
the LED tube driving circuit module is used for receiving corresponding level control signals and common anode and common cathode control signals, converting the corresponding level control signals into corresponding first driving current signals and outputting the corresponding first driving current signals to corresponding gating ends in an external LED display device, judging the polarity of a common end of the external LED display device according to the common anode and common cathode control signals, switching the working mode of the integrated LED driving circuit structure into a common cathode control mode, a common anode control mode or a common cathode and common anode coexistence control mode, and providing dynamic driving signals for the dynamic driving circuit module;
the dynamic driving circuit module is correspondingly connected with the LED tube driving circuit module, and is used for receiving a corresponding COM output enabling signal, outputting a corresponding second driving current signal to a corresponding public end in the external LED display module and enabling the display brightness of the external LED display device to be consistent under all display conditions according to the dynamic driving signal;
the LED tube driving circuit module comprises:
the system comprises N level control signal input ends, wherein each level control signal input end is used for receiving a corresponding level control signal;
each first driving current signal output end is used for outputting a corresponding first driving current signal obtained by converting a corresponding level control signal to a corresponding gating end in an external LED display device;
the common anode and common cathode control end is used for receiving a common anode and common cathode control signal, judging the polarity of the common end according to the external LED display device according to the common anode and common cathode control signal, and switching the working mode of the integrated LED drive circuit structure into a common cathode control mode, a common anode control mode or a common cathode and common anode coexistence control mode;
the dynamic driving signal output end is correspondingly connected with the dynamic driving circuit module and is used for providing dynamic driving signals for the dynamic driving circuit module;
wherein N is the number of corresponding gating ends in the external LED display device;
the dynamic driving circuit module comprises M dynamic driving circuit units, wherein each dynamic driving circuit unit comprises a dynamic driving signal input end, a COM output enabling end and a COM output control end;
wherein M is the number of corresponding control ends in the external LED display device;
the dynamic driving signal input end is correspondingly connected with the dynamic driving signal output end in the LED tube driving circuit module and is used for enabling the display brightness of the external LED display device to be consistent under all display conditions according to the dynamic driving signal;
the COM output enabling end is used for receiving the corresponding COM output enabling signal;
the COM output control end is used for outputting a corresponding second driving current signal to a corresponding public end in the external LED display module.
2. The integrated LED driver circuit structure of claim 1, wherein the LED tube driver circuit module further comprises N xor gate units, wherein each xor gate unit comprises a first input terminal, a second input terminal, and a first output terminal;
the first input ends are all used as corresponding level control signal input ends and are used for receiving corresponding level control signals;
the second input end is used as a common anode and common cathode control end and is used for receiving a common anode and common cathode control signal, judging the polarity of the common end of the external LED display device according to the common anode and common cathode control signal, and switching the working mode of the integrated LED drive circuit structure into a common cathode control mode, a common anode control mode or a common cathode and common anode coexistence control mode;
the first output ends are used as corresponding first driving current signal output ends and are used for outputting corresponding first driving current signals obtained by converting corresponding level control signals to corresponding gating ends in the external LED display device;
and the first input end and the first output end form the dynamic driving signal output end together, are correspondingly connected with the dynamic driving circuit module and are used for providing dynamic driving signals for the dynamic driving circuit module.
3. The integrated LED driving circuit structure according to claim 2, wherein the dynamic driving circuit unit further comprises N dynamic driving circuit sub-units,
wherein each dynamic driving circuit subunit comprises an AND gate and a tri-state driver;
the AND gate comprises a third input end, a fourth input end and a second output end;
the tri-state driver comprises a fifth input end, a sixth input end and a third output end;
the third input end is used as the COM output enabling end and is used for receiving the corresponding COM output enabling signal;
the second output end is connected with the fifth input end;
the fourth input end and the sixth input end form the dynamic driving signal input end together and are connected with the LED tube driving circuit module, wherein the fourth input end is connected with the first input end of the corresponding exclusive-OR gate unit in the LED tube driving circuit module, and the sixth input end is connected with the first output end of the corresponding exclusive-OR gate unit in the LED tube driving circuit module;
the third output end is used as the COM output control end for outputting a corresponding second driving current signal to a corresponding public end in the external LED display module.
4. The integrated LED driving circuit structure is characterized by comprising an LED tube driving circuit module and a dynamic driving circuit module, wherein:
the LED tube driving circuit module is used for receiving corresponding level control signals and common anode and common cathode control signals, converting the corresponding level control signals into corresponding first driving current signals and outputting the corresponding first driving current signals to corresponding gating ends in an external LED display device, judging the polarity of a common end of the external LED display device according to the common anode and common cathode control signals, switching the working mode of the integrated LED driving circuit structure into a common cathode control mode, a common anode control mode or a common cathode and common anode coexistence control mode, and providing dynamic driving signals for the dynamic driving circuit module;
the dynamic driving circuit module is correspondingly connected with the LED tube driving circuit module, and is used for receiving a corresponding COM output enabling signal, outputting a corresponding second driving current signal to a corresponding public end in the external LED display module and enabling the display brightness of the external LED display device to be consistent under all display conditions according to the dynamic driving signal;
the dynamic driving circuit module comprises M dynamic driving circuit units,
each dynamic driving circuit unit comprises a dynamic driving signal input end, a COM output enabling end and a COM output control end;
wherein M is the number of corresponding control ends in the external LED display device;
the dynamic driving signal input end is correspondingly connected with the dynamic driving signal output end in the LED tube driving circuit module and is used for enabling the display brightness of the external LED display device to be consistent under all display conditions according to the dynamic driving signal;
the COM output enabling end is used for receiving a corresponding COM output enabling signal;
the COM output control end is used for outputting a corresponding second driving current signal to a corresponding public end in the external LED display module.
5. The integrated LED driving circuit structure of claim 4, wherein said dynamic driving circuit unit further comprises N dynamic driving circuit subunits, N being the number of corresponding gates in said external LED display device;
wherein each dynamic driving circuit subunit comprises an AND gate and a tri-state driver;
the AND gate comprises a third input end, a fourth input end and a second output end;
the tri-state driver comprises a fifth input end, a sixth input end and a third output end;
the third input end is used as the COM output enabling end and is used for receiving the corresponding COM output enabling signal;
the second output end is connected with the fifth input end;
the fourth input end and the sixth input end form the dynamic driving signal input end together and are connected with the LED tube driving circuit module, wherein the fourth input end is connected with the first input end of the corresponding exclusive-OR gate unit in the LED tube driving circuit module, and the sixth input end is connected with the first output end of the corresponding exclusive-OR gate unit in the LED tube driving circuit module;
the third output end is used as the COM output control end for outputting a corresponding second driving current signal to a corresponding public end in the external LED display module.
6. An LED display system having the integrated LED driving circuit structure of any one of claims 1 to 3 or 4 to 5, wherein the LED display system further comprises an LED display control module and an LED display device;
the LED display control module is correspondingly connected with the LED tube driving circuit module and the dynamic driving circuit module respectively, and is used for sending the corresponding level control signal and the common anode and common cathode control signal to the LED tube driving circuit module and sending the corresponding COM output enabling signal to the dynamic driving circuit module;
the LED display device is provided with N gating ends and M public ends, the N gating ends are correspondingly connected with the LED tube driving circuit module, and the M public ends are correspondingly connected with the dynamic driving circuit module and are used for displaying corresponding characters according to the first driving current signal and the second driving current signal;
wherein N is more than or equal to 1, and M is more than or equal to 1.
7. The LED display system of claim 6, further comprising N current limiting resistors, wherein said LED tube driving circuit module is correspondingly connected to N strobe terminals of said LED display device by said N current limiting resistors.
8. The LED display system of claim 7, wherein the LED display device is an LED nixie tube display device or an LED dot matrix display device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711058808.5A CN109754747B (en) | 2017-11-01 | 2017-11-01 | Integrated LED driving circuit structure and corresponding LED display system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711058808.5A CN109754747B (en) | 2017-11-01 | 2017-11-01 | Integrated LED driving circuit structure and corresponding LED display system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109754747A CN109754747A (en) | 2019-05-14 |
| CN109754747B true CN109754747B (en) | 2023-09-19 |
Family
ID=66398906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711058808.5A Active CN109754747B (en) | 2017-11-01 | 2017-11-01 | Integrated LED driving circuit structure and corresponding LED display system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109754747B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113724632B (en) * | 2021-09-07 | 2023-11-03 | 华帝股份有限公司 | Control method and device for adjusting display brightness according to number of pen segments |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2000343A (en) * | 1977-06-21 | 1979-01-04 | Vogel & Halke | Control and fault-indicating circuitry for led-displays |
| CN1206172A (en) * | 1998-06-15 | 1999-01-27 | 王仲健 | LED pixel driver circuit and tristate driving method |
| JP2007076255A (en) * | 2005-09-15 | 2007-03-29 | Oki Data Corp | Driving circuit and image forming apparatus using the same |
| CN201655254U (en) * | 2010-04-14 | 2010-11-24 | 中国人民解放军军事交通学院 | Large-sized digital tube display circuit based on MAX7219 |
| CN202905114U (en) * | 2012-09-21 | 2013-04-24 | 中山市晶威电子科技有限公司 | LED display drive circuit |
| CN103165058A (en) * | 2011-12-13 | 2013-06-19 | 无锡华润矽科微电子有限公司 | Multi-section nixie tube display drive circuit structure |
| CN203397666U (en) * | 2013-07-09 | 2014-01-15 | 中山市晶威电子科技有限公司 | LED display based on LED on-line state detection to realize mode output |
| CN204257173U (en) * | 2013-12-06 | 2015-04-08 | 马建华 | Colored segment code type digital tube display device |
| CN104808852A (en) * | 2015-04-30 | 2015-07-29 | 福州福大海矽微电子有限公司 | Touch identification and digital display integrated circuit as well as peripheral circuit and accessing method thereof |
| CN104966426A (en) * | 2015-07-24 | 2015-10-07 | 黄克亚 | Arithmetic learning machine for children |
| CN205354616U (en) * | 2016-02-02 | 2016-06-29 | 山西大同大学 | Novel dynamic scanning circuit |
-
2017
- 2017-11-01 CN CN201711058808.5A patent/CN109754747B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2000343A (en) * | 1977-06-21 | 1979-01-04 | Vogel & Halke | Control and fault-indicating circuitry for led-displays |
| CN1206172A (en) * | 1998-06-15 | 1999-01-27 | 王仲健 | LED pixel driver circuit and tristate driving method |
| JP2007076255A (en) * | 2005-09-15 | 2007-03-29 | Oki Data Corp | Driving circuit and image forming apparatus using the same |
| CN201655254U (en) * | 2010-04-14 | 2010-11-24 | 中国人民解放军军事交通学院 | Large-sized digital tube display circuit based on MAX7219 |
| CN103165058A (en) * | 2011-12-13 | 2013-06-19 | 无锡华润矽科微电子有限公司 | Multi-section nixie tube display drive circuit structure |
| CN202905114U (en) * | 2012-09-21 | 2013-04-24 | 中山市晶威电子科技有限公司 | LED display drive circuit |
| CN203397666U (en) * | 2013-07-09 | 2014-01-15 | 中山市晶威电子科技有限公司 | LED display based on LED on-line state detection to realize mode output |
| CN204257173U (en) * | 2013-12-06 | 2015-04-08 | 马建华 | Colored segment code type digital tube display device |
| CN104808852A (en) * | 2015-04-30 | 2015-07-29 | 福州福大海矽微电子有限公司 | Touch identification and digital display integrated circuit as well as peripheral circuit and accessing method thereof |
| CN104966426A (en) * | 2015-07-24 | 2015-10-07 | 黄克亚 | Arithmetic learning machine for children |
| CN205354616U (en) * | 2016-02-02 | 2016-06-29 | 山西大同大学 | Novel dynamic scanning circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109754747A (en) | 2019-05-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7808493B2 (en) | Displaying apparatus using data line driving circuit and data line driving method | |
| EP1694099B1 (en) | LED driver device | |
| US6160354A (en) | LED matrix current control system | |
| US8542170B2 (en) | Display device having data driver adjusting setup time and hold time | |
| KR102539963B1 (en) | Gamma voltage generating circuit and display driving device including the same | |
| TW201447861A (en) | Charge sharing method for reducing power consumption and apparatuses performing the same | |
| US9922612B2 (en) | Display device and display method | |
| CN109754747B (en) | Integrated LED driving circuit structure and corresponding LED display system | |
| TWI755903B (en) | Backlight module and display apparatus | |
| US20150381197A1 (en) | Driving voltage generator and digital to analog converter | |
| CN113380191B (en) | Display panel driving device and display device | |
| US8378948B2 (en) | Driving circuit and organic light emitting diode display device including the same | |
| CN207397672U (en) | Integrated led drive circuit structure and corresponding led display system | |
| CN213635161U (en) | Dot-matrix nixie tube | |
| KR101715855B1 (en) | Timing controller of liquid crystal display device | |
| CN219066407U (en) | Integrated LED drive circuit, LED display circuit and electrical equipment | |
| CN214587959U (en) | Improved 7-segment digital display system | |
| US20180324912A1 (en) | Display device | |
| CN105070206B (en) | A kind of display device | |
| JPH01266595A (en) | Lighting brightness controller for light emission diode matrix display | |
| CN216902208U (en) | Six-stroke display 6 and 9 common-cathode seven-segment digital tube display system | |
| US11373589B1 (en) | Display with pixel devices emitting light simultaneously | |
| CN111540314B (en) | Display control method, control circuit, chip and electronic equipment | |
| CN112581878A (en) | Dot-matrix nixie tube and display control method thereof | |
| US20230316983A1 (en) | Gamma voltage generator, source driver and display apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 214135 -6, Linghu Avenue, Wuxi Taihu international science and Technology Park, Wuxi, Jiangsu, China, 180 Applicant after: China Resources micro integrated circuit (Wuxi) Co.,Ltd. Address before: No.180-22, Linghu Avenue, Taihu International Science and Technology Park, Wuxi, Jiangsu 214135 Applicant before: WUXI CHINA RESOURCES SEMICO Co.,Ltd. |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |