LED drive circuit and electronic equipment

Abstract

The present invention provides an LED driving circuit and electronic device, in which several LED driving chips in each serial communication module of the circuit are connected by a data line to form a serial communication link, and the data port of the LED driving control module is connected to the first port of the first LED driving chip of the serial communication module, which reduces the wiring length of the LED driving circuit and avoids the risk of cross-line of the LED driving circuit. The second port of the last LED driving chip of the circuit receives an address voltage, and the address voltages received by the N last LED driving chips are different. Each last LED driving chip is configured to: parse and process the address voltage to obtain row address information, and send the row address information to the data port of the LED driving control module based on the configuration information. Since the address voltages received by each last LED driving chip are different, the row address information obtained is different, so the LED driving control module can obtain the accurate row address of each serial communication module.

Description

Technical Field

[0001] The present invention relates to the technical field of LED driving, and in particular to an LED driving circuit and electronic equipment. Background Art

[0002] For traditional LED drive circuit, please refer to Figure 1 , consisting of an LED driving control module 100 and a serial communication module 200. The data port of the LED driving control module 100 is coupled to the first port of the first LED driving chip of the serial communication module 200, and several LED driving chips 201 in the serial communication module 200 are connected by a data line to form a serial communication link.

[0003] However, when LED driver chips need to be arranged in multiple rows, the connection between the last LED driver chip in each row and the first LED driver chip in the next row requires very long connecting wires, or even cross-line connections, resulting in longer wiring of the LED driver circuit and the risk of cross-line connections.

[0004] In addition, for traditional LED driving circuits, when LED driving chips need to be arranged in multiple rows, since several LED driving chips in different rows are connected by the same data line to form a row serial communication link, the LED driving control module cannot accurately obtain the row address of each LED driving chip.

[0005] Therefore, for an LED driving circuit in which LED driving chips are arranged in multiple rows, how to solve the technical problem of how the LED driving control module can obtain the accurate row address of the LED driving chip, reduce the wiring length and avoid the risk of cross-line has become a technical problem that needs to be solved urgently in the prior art. Summary of the invention

[0006] The present invention provides an LED driving circuit and an electronic device. For an LED driving circuit in which LED driving chips are arranged in multiple rows, the technical problems that an LED driving control module can obtain accurate row addresses of LED driving chips, reduce wiring length and avoid cross-line risks are solved.

[0007] According to a first aspect of the present invention, an embodiment of the present invention provides an LED driving circuit; comprising: an LED driving control module and N serial communication modules, each serial communication module comprising a plurality of LED driving chips, wherein N is an integer greater than or equal to 2; wherein: Several LED driver chips in the serial communication module are connected via a data line to form a serial communication link, and the LED driver chip includes a first port and a second port, and the first port and the second port are used to send or receive data; The first port of the first LED driver chip of the serial communication module is connected to the data port of the LED driver control module to send or receive data to the LED driver control module; The second port of the last LED driver chip of the serial communication module receives an address voltage, and the address voltages received by the N last LED driver chips are different from each other; The last LED driver chip is configured to: parse the address voltage to obtain row address information, and send the row address information to the data port of the LED driver control module based on configuration information, wherein the configuration information includes the information transmission order of N serial communication modules.

[0008] Optionally, the last LED driver chip includes: a voltage detection unit and a digital communication unit; The first end of the voltage detection unit is coupled to the second port of the last LED driver chip, the second end of the voltage detection unit is coupled to the first end of the digital communication unit, and the second end of the digital communication unit is coupled to the first port of the last LED driver chip, wherein: The voltage detection unit is used to: collect the address voltage and output a detection signal; The digital communication unit is used to analyze the detection signal to obtain row address information, and send the row address information to the data port of the LED drive control module based on configuration information.

[0009] Optionally, the voltage detection unit includes a comparator; The non-phase input terminal of the comparator is coupled to the second port of the last LED driver chip, the inverting input terminal of the comparator receives a reference voltage signal, and the output terminal of the comparator is coupled to the first terminal of the digital communication unit; the reference voltage signal includes a plurality of different reference voltages, and the comparator is used to compare the address voltage with a plurality of reference voltages respectively to obtain a detection signal, and the detection signal includes a plurality of bits, and each bit corresponds to a comparison result between a reference voltage and the address voltage.

[0010] Optionally, the digital communication unit includes an address resolution subunit and a communication subunit; The first end of the address resolution subunit is coupled to the output end of the comparator, the second end of the address resolution subunit is coupled to the first end of the communication subunit, and the second end of the communication subunit is coupled to the first port of the last LED driver chip; The address parsing subunit is used to receive the detection signal, and parse the detection signal based on the mapping relationship between the bit value of the detection signal and the row address to obtain the row address information; The communication subunit is used to send the row address information to the data port of the LED drive control module based on configuration information.

[0011] Optionally, the second port Do of each last LED driver chip 210 is connected to an address resistor R adder , each last LED driver chip includes a corresponding current source and a switch; The first end of the address resistor receives a first voltage, and the second end of the address resistor is coupled to the second port of the last LED driver chip; The first end of the current source is coupled to the second port of the last LED driver chip through a switch, and the second end of the current source receives a second voltage.

[0012] Optionally, the currents provided by the N current sources are the same or the resistance values ​​of the N address resistors are the same.

[0013] Optionally, the first voltage is a power supply voltage, and the second voltage is a ground voltage.

[0014] Optionally, the address voltage has the relationship: V adder =VDD-I×R adder Among them, V adder is the address voltage, VDD is the power supply voltage, I represents the current value of the current source, R adder Indicates the resistance value of the address resistor.

[0015] Optionally, the first voltage is a ground voltage, and the second voltage is a power supply voltage.

[0016] Optionally, the address voltage has the relationship: V adder =I×R adder Among them, V adder is the address voltage, I represents the current value of the current source, R adder Indicates the resistance value of the address resistor.

[0017] According to a second aspect of the present invention, an embodiment of the present invention provides an electronic device, comprising any one of the above LED driving circuits.

[0018] Compared with the prior art, the technical solution of the embodiment of the present invention has the following beneficial effects: The present invention provides an LED driving circuit and electronic device. The circuit forms a serial communication link by connecting several LED driving chips in each serial communication module through a data line. The data port of the LED driving control module is connected to the first port of the first LED driving chip of the serial communication module, which reduces the wiring length of the LED driving circuit and avoids the risk of cross-line of the LED driving circuit. The second port of the last LED driving chip of the circuit receives an address voltage, and the address voltages received by the N last LED driving chips are different. Each last LED driving chip is configured to: parse and process the address voltage to obtain row address information, and send the row address information to the data port of the LED driving control module based on the configuration information. Since the address voltages received by each last LED driving chip are different, the row address information obtained is different, so the LED driving control module can obtain the accurate row address of each serial communication module. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of a traditional LED driving circuit of the present invention; Figure 2 It is a structural schematic diagram of an LED driving circuit of the prior art of the present invention; Figure 3 It is a structural schematic diagram provided by an embodiment of an LED driving circuit of the present invention; Figure 4 It is a structural schematic diagram of a first embodiment of a last LED driver chip of the present invention; Figure 5 It is a structural schematic diagram of a second embodiment of a last LED driver chip of the present invention; Figure 6 It is a structural schematic diagram of a third embodiment of a last-position LED driver chip of the present invention; Figure 7 It is a structural schematic diagram of a fourth embodiment of a last-position LED driver chip of the present invention; Figure 8 It is a structural schematic diagram of a fifth embodiment of a last LED driver chip of the present invention. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or modules is not necessarily limited to those steps or modules that are clearly listed, but may include other steps or modules that are not clearly listed or inherent to these processes, methods, products or devices.

[0023] The technical solution of the present invention is described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0024] As described in the background technology, the present invention aims to solve the technical problem that for an LED driving circuit in which LED driving chips are arranged in multiple rows, an LED driving control module can obtain accurate row addresses of LED driving chips, reduce wiring length, and avoid cross-line risks. The following will be described in conjunction with the accompanying drawings.

[0025] Before filing this application, the applicant has conducted sufficient research on LED drive circuits. For example, please refer to Figure 2 , shows a schematic diagram of an LED driving circuit, comprising: an LED driving control module 100 and N serial communication modules 200 connected to the LED driving control module 100; Each serial communication module 200 includes a plurality of LED driver chips 210, where N is an integer greater than or equal to 2; wherein: A plurality of the LED driver chips 210 in the serial communication module 200 are connected via a data line to form a serial communication link. The LED driver chip 210 includes a first port Di and a second port Do, and the first port Di and the second port Do are used to send or receive data; The LED driving control module 100 includes N data ports DOS, each of which is connected to the first port Di of the first LED driving chip 210 of the serial communication module 200 and sends or receives data through the first LED driving chip 210 .

[0026] Although this implementation reduces the wiring cost of the LED driving circuit and avoids wiring branching of the LED driving circuit, the LED driving control module requires multiple data ports, which increases the design and use cost of the LED driving control module.

[0027] In order to solve the above problems, an embodiment of the present invention provides an LED driving circuit, which forms a serial communication link by connecting several LED driving chips in each serial communication module through a data line. The data port of the LED driving control module is connected to the first port of the first LED driving chip of the serial communication module, which reduces the wiring length of the LED driving circuit and avoids the risk of cross-line of the LED driving circuit. The second port of the last LED driving chip of the circuit receives the address voltage, and the address voltages received by the N last LED driving chips are different. Each last LED driving chip is configured to: parse the address voltage to obtain row address information, and send the row address information to the data port of the LED driving control module based on the configuration information. Since the address voltages received by each last LED driving chip are different, the row address information obtained is different, so the LED driving control module can obtain the accurate row address of each serial communication module.

[0028] In order to make the above-mentioned objects, features and beneficial effects of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] Please refer to Figure 3 An embodiment of the present invention provides an LED driving circuit, comprising: an LED driving control module 100 and N serial communication modules 200, each serial communication module 200 includes a plurality of LED driving chips 210, wherein N is an integer greater than or equal to 2; wherein: The LED driver chips 210 in the serial communication module 200 are connected via a data line to form a serial communication link. The LED driver chip 210 includes a first port Di and a second port Do. The first port Di and the second port Do are used to send or receive data. The first port Di of the first LED driver chip 210 of the serial communication module 200 is connected to the data port DOS of the LED driver control module 100 to send or receive data to the LED driver control module 100; The second port Do of the last LED driver chip 210 of the serial communication module 200 receives the address voltage V adder , the address voltage V received by the N last LED driver chips 210 adder Different from each other; The last LED driver chip 210 is configured to: adder The row address information is obtained by performing parsing processing, and the row address information is sent to the data port DOS of the LED drive control module 100 based on the configuration information, wherein the configuration information includes the information transmission sequence of the N serial communication modules 200 .

[0030] The number of LED driver chips 210 in each serial communication module 200 may be the same or different.

[0031] exist Figure 3 The address voltage V in the example adder The voltage values ​​are different from each other.

[0032] The configuration information in the present invention is used to control the N serial communication modules 200 to transmit row address information to the data port DOS of the LED drive control module 100 at different times to ensure that the row address information of the N last LED driver chips 210 is sent to the data port DOS of the LED drive control module 100 at different times.

[0033] It can be seen that the circuit connects the first LED driver chip of each serial communication module through a data port of the LED driver control module, which reduces the wiring length of the LED driver circuit and avoids the risk of cross-line of the LED driver circuit. Since the address voltages received by the last LED driver chips in this circuit are different, the row address information obtained is different, so the LED driver control module can obtain the accurate row address of each serial communication module.

[0034] The internal structure of the last LED driver chip is now described in detail: As an implementation, please refer to Figure 4 , the last LED driver chip 210 includes: a voltage detection unit 211 and a digital communication unit 212; The first end of the voltage detection unit 211 is coupled to the second port Do of the last LED driver chip 210, the second end of the voltage detection unit 211 is coupled to the first end of the digital communication unit 212, and the second end of the digital communication unit 212 is coupled to the first port Di of the last LED driver chip 210, wherein: The voltage detection unit 211 is used to: detect the address voltage V adderCollect data and output detection signals; The digital communication unit 212 is used to analyze the detection signal to obtain row address information, and send the row address information to the data port DOS of the LED drive control module 100 based on configuration information.

[0035] As a specific implementation, please refer to Figure 5 , the voltage detection unit 211 includes a comparator CMP; The non-inverting input terminal of the comparator CMP is coupled to the second port Do of the last LED driver chip 210, the inverting input terminal of the comparator CMP receives the reference voltage signal V_CAS, and the output terminal of the comparator is coupled to the first terminal of the digital communication unit 212; the reference voltage signal V_CAS includes a plurality of different reference voltages, and the comparator is used to convert the address voltage V adder The detection signals are compared with several reference voltages to obtain detection signals, wherein the detection signals include several bits, each bit corresponding to a reference voltage and the address voltage V adder The comparison results.

[0036] It should be understood that the comparator CMP is an implementation of the voltage detection unit, and the voltage detection unit can also be other devices that can detect the address voltage V adder The circuit or device being tested.

[0037] In order to parse and process the detection signal to obtain row address information, and send the row address information to the adjacent LED driver chip 210, in this case, in a specific implementation, please refer to Figure 6 , the digital communication unit 212 includes an address resolution subunit 2122 and a communication subunit 2121; The first end of the address resolution subunit 2122 is coupled to the output end of the comparator CMP, the second end of the address resolution subunit 2122 is coupled to the first end of the communication subunit 2121, and the second end of the communication subunit 2121 is coupled to the first port Di of the last LED driver chip 210; The address parsing subunit 2122 is used to receive the detection signal, and parse and obtain the row address information based on the mapping relationship between the bit value of the detection signal and the row address; The communication subunit 2121 is used to send the row address information to the data port DOS of the LED drive control module 100 based on the configuration information.

[0038] As an embodiment, the second port Do of each last LED driver chip 210 is connected to an address resistor Radder , each last LED driver chip 210 includes a corresponding current source I and a switch SW; The address resistor R adder The first end receives a first voltage, the address resistor R adder The second end of is coupled to the second port Do of the last LED driver chip 210; A first terminal of the current source I is coupled to the second port Do of the last LED driver chip 210 through a switch SW, and a second terminal of the current source I receives a second voltage.

[0039] The present invention provides a corresponding address voltage V to the second port Do of each last LED driver chip 210 through this setting. adder .

[0040] Of course, it should be understood that the corresponding address voltage V is provided to the second port Do of each last LED driver chip 210. adder The present invention is not limited thereto, and those skilled in the art may also provide the corresponding address voltage V to the second port Do of each last LED driver chip 210 in other ways. adder For example, a voltage source is connected to the second port Do of each last LED driver chip 210 .

[0041] For the current source I, the switch and the address resistor R adder、 For the specific connection and implementation of the first voltage and the second voltage, please refer to Figure 7 as well as Figure 8 A schematic diagram of a specific embodiment of the invention.

[0042] To realize the address voltage V received by the N last LED driver chips 210 adder In a specific implementation manner, the currents provided by the N current sources I are the same or the N address resistors R adder The resistance value is the same.

[0043] Therefore, the present invention only needs to control N address resistors R adder The resistance values ​​of the N current sources I are different from each other or the currents provided by the N current sources I are different from each other, so that the address voltage V received by the N last LED driver chips 210 can be realized. adder Different from each other.

[0044] Furthermore, the address resistor R adder Can be used as a pull-up resistor or a pull-down resistor.

[0045] As a specific example, please refer to Figure 7, the first voltage is the power supply voltage VDD, and the second voltage is the ground voltage GND. In this case, the address resistor R in the embodiment of the present invention adder As a pull-up resistor.

[0046] Furthermore, the address voltage V adder With the relation: V adder =VDD-I×R adder Wherein, VDD is the power supply voltage VDD, I represents the current value of the current source I, R adder Represents the address resistance R adder resistance value.

[0047] As another specific embodiment, please refer to Figure 8 , the first voltage is the ground voltage GND, and the second voltage is the power supply voltage VDD. In this case, the address resistor R in the embodiment of the present invention adder as a pull-down resistor.

[0048] Furthermore, the address voltage V adder With the relation: V adder =I×R adder Wherein, I represents the current value of the current source I, R adder Represents the address resistance R adder resistance value.

[0049] In summary, the LED driving circuit provided by the present invention forms a serial communication link by connecting several LED driving chips in each serial communication module through a data line, and the data port of the LED driving control module is connected to the first port of the first LED driving chip of the serial communication module, which reduces the wiring length of the LED driving circuit and avoids the risk of cross-line of the LED driving circuit. The second port of the last LED driving chip of the circuit receives the address voltage, and the address voltages received by the N last LED driving chips are different. Each last LED driving chip is configured to: parse and process the address voltage to obtain row address information, and send the row address information to the data port of the LED driving control module based on the configuration information. Since the address voltages received by each last LED driving chip are different, the row address information obtained is different, so the LED driving control module can obtain the accurate row address of each serial communication module.

[0050] In addition, the present invention provides an electronic device, comprising any one of the above-mentioned LED driving circuits.

[0051] As an example, the electronic device may be a lighting device, a display device, an indicating device, etc. Of course, it should be understood that the present invention is not limited thereto, and the electronic device may also be other types of electronic devices that require LED light sources.

[0052] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. An LED driving circuit, characterized in that: include: An LED drive control module and N serial communication modules, each serial communication module includes a number of LED drive chips, where N is an integer greater than or equal to 2; wherein: Several LED driver chips in the serial communication module are connected via a data line to form a serial communication link, and the LED driver chip includes a first port and a second port, and the first port and the second port are used to send or receive data; The first port of the first LED driver chip of the serial communication module is connected to the data port of the LED driver control module to send or receive data to the LED driver control module; The second port of the last LED driver chip of the serial communication module receives an address voltage, and the address voltages received by the N last LED driver chips are different from each other; The last LED driver chip is configured to: parse the address voltage to obtain row address information, and send the row address information to the data port of the LED driver control module based on configuration information, wherein the configuration information includes the information transmission order of N serial communication modules.

2. The LED driving circuit according to claim 1, characterized in that: The last LED driver chip includes: a voltage detection unit and a digital communication unit; The first end of the voltage detection unit is coupled to the second port of the last LED driver chip, the second end of the voltage detection unit is coupled to the first end of the digital communication unit, and the second end of the digital communication unit is coupled to the first port of the last LED driver chip, wherein: The voltage detection unit is used to: collect the address voltage and output a detection signal; The digital communication unit is used to: parse and process the detection signal to obtain row address information, and send the row address information to the data port of the LED drive control module based on configuration information.

3. The LED driving circuit according to claim 2, characterized in that: The voltage detection unit includes a comparator; The non-phase input terminal of the comparator is coupled to the second port of the last LED driver chip, the inverting input terminal of the comparator receives a reference voltage signal, and the output terminal of the comparator is coupled to the first terminal of the digital communication unit; The reference voltage signal includes several different reference voltages. The comparator is used to compare the address voltage with the several reference voltages respectively to obtain a detection signal. The detection signal includes several bits, and each bit corresponds to a comparison result between a reference voltage and the address voltage.

4. The LED driving circuit according to claim 3, characterized in that: The digital communication unit includes an address resolution subunit and a communication subunit; The first end of the address resolution subunit is coupled to the output end of the comparator, the second end of the address resolution subunit is coupled to the first end of the communication subunit, and the second end of the communication subunit is coupled to the first port of the last LED driver chip; The address parsing subunit is used to receive the detection signal, and parse the detection signal based on the mapping relationship between the bit value of the detection signal and the row address to obtain the row address information; The communication subunit is used to send the row address information to the data port of the LED drive control module based on configuration information.

5. The LED driving circuit according to claim 1, characterized in that: The second port of each last LED driver chip is connected to an address resistor, and each last LED driver chip includes a corresponding current source and a switch; The first end of the address resistor receives a first voltage, and the second end of the address resistor is coupled to the second port of the last LED driver chip; The first end of the current source is coupled to the second port of the last LED driver chip through a switch, and the second end of the current source receives a second voltage.

6. The LED driving circuit according to claim 5, characterized in that: The currents provided by the N current sources are the same or the resistance values ​​of the N address resistors are the same.

7. The LED driving circuit according to claim 6, characterized in that: The first voltage is a power supply voltage, and the second voltage is a ground voltage.

8. The LED driving circuit according to claim 7, characterized in that: The address voltage has the relationship: V adder =VDD-I×R adder Among them, V adder is the address voltage, VDD is the power supply voltage, I represents the current value of the current source, R adder Indicates the resistance value of the address resistor.

9. The LED driving circuit according to claim 6, characterized in that: The first voltage is a ground voltage, and the second voltage is a power supply voltage.

10. The LED driving circuit according to claim 9, characterized in that: The address voltage has the relationship: In adder =I×R adder Among them, V adder is the address voltage, I represents the current value of the current source, R adder Indicates the resistance value of the address resistor.

11. An electronic device, characterized in that: It comprises the LED driving circuit as described in any one of claims 1 to 10.

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