CN112885294A - LED drive chip, drive circuit and display unit of dual signal source input - Google Patents
LED drive chip, drive circuit and display unit of dual signal source input Download PDFInfo
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- CN112885294A CN112885294A CN202110112664.7A CN202110112664A CN112885294A CN 112885294 A CN112885294 A CN 112885294A CN 202110112664 A CN202110112664 A CN 202110112664A CN 112885294 A CN112885294 A CN 112885294A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention belongs to the technical field of LED display, and particularly relates to an LED driving chip with double signal source inputs. The chip includes: the detection unit is used for outputting a detection signal according to data input by an input pin and a bypass pin of the LED driving chip; an input/output management unit for taking the input pin or the bypass pin as an input terminal and taking the output pin as an output terminal based on the detection signal; or, the output pin is used as the input end, and the input pin is used as the output end; the signal processing unit is used for receiving the control data, extracting display control data required by the LED driving chip at the current stage based on the detection signal, and outputting the rest control data through an output end; and the constant current control unit is used for receiving the display control data and controlling the working state of the LED connected with the constant current control unit according to the display control data. The driving chip adopts double-signal-source input, when two adjacent points are damaged, the subsequent node can be automatically switched to a standby signal source, and the normal use of the subsequent node is ensured.
Description
Technical Field
The application belongs to the technical field of LED display, and particularly relates to an LED driving chip, a driving circuit and a display unit with double signal source input.
Background
LEDs are called fourth generation illumination sources or green light sources and are widely used in various fields such as indication, display, decoration, backlight, general illumination, and urban night scenes. According to different use functions, the system can be divided into five categories of information display, signal lamps, vehicle lamps, liquid crystal display backlight sources and general illumination.
When the LED is used, a controller generally controls a plurality of cascaded LED units, each LED unit including a plurality of LED light emitting chips and an LED driving chip for driving the plurality of light emitting chips.
The existing LED driving chip only receives one path of control data, so when an LED unit on a cascade link fails or is damaged, a subsequent point on the cascade link cannot be normally used because the subsequent point cannot receive the control data.
Disclosure of Invention
Technical problem to be solved
In order to solve the above problems in the prior art, the present invention provides a dual-signal-source input LED driving chip, a driving circuit and a display unit.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
the invention provides a double-signal-source input LED driving chip, which comprises:
the detection unit is used for detecting the running state of the superior LED driving chip according to the data input by the input pin and the bypass pin of the LED driving chip and outputting a detection signal;
the input and output management unit is connected with the detection unit and is used for taking an input pin or a bypass pin as an input end to receive control data and taking an output pin as an output end to output residual control data based on a detection signal; or, the output pin is used as an input end to receive the control data, and the input pin is used as an output end to output the rest control data;
the signal processing unit is connected with the detection unit and the input and output management unit, and is used for receiving control data input by the input end of the LED driving chip, extracting display control data required by the current-stage LED driving chip based on a detection signal, outputting the display control data to the constant current control unit, and outputting the residual control data after the display control data is extracted through the output end;
and the constant current control unit is connected with the signal processing unit and is used for receiving the display control data and controlling the working state of the LED connected with the constant current control unit according to the display control data.
Optionally, detecting an operating state of a preceding LED driving chip according to data input by an input pin and a bypass pin of the LED driving chip, includes:
when the control data input by the input pin and the bypass pin are normal, the running state of the previous-stage LED driving chip is a normal state;
when the control data input by the input pin is abnormal and the control data input by the bypass pin is normal, the running state of the previous-stage LED driving chip is an abnormal state;
when the control data input by the input pin and the bypass pin are abnormal, the running states of the first two stages of LED driving chips are abnormal.
Optionally, based on the detection signal, taking the input pin or the bypass pin as an input terminal to receive the control data, and taking the output pin as an output terminal to output the remaining control data; or, the method, which takes the output pin as the input end to receive the control data and takes the input pin as the output end to output the rest control data, includes:
when the running state of the previous stage of LED driving chip is a normal state, taking an input pin as an input end to receive first control data, taking the first control data as control data, and taking an output pin as an output end to output residual control data;
when the running state of the previous stage of LED driving chip is an abnormal state, taking a bypass pin as an input end to receive second control data, taking the second control data as control data, and taking an output pin as an output end to output residual control data;
when the running state of the two current stages of LED driving chips is an abnormal state, the output pin is used as an input end to receive third control data, the third control data is used as control data, and the input pin is used as an output end to output residual control data.
Optionally, the signal processing unit includes a processor, a configuration register, and an oscillator;
the processor is connected with the configuration register and used for processing the received control data, extracting the display control data of the driving chip, storing the display control data in the configuration register, carrying out clock synchronization and regeneration on the residual control data after the display control data is extracted based on the oscillator and the control data, and then sending the residual control data to the input and output management unit;
the configuration register is connected with the processor and used for storing display control data of the current-stage LED driving chip;
the oscillator is connected with the processor and used for generating clock oscillation pulses of the chip.
Optionally, the constant current control unit includes: the device comprises a gray level control and PWM module, a brightness adjusting module and a constant current driving module;
the gray control and PWM module is connected with the constant current driving module and used for generating corresponding gray control signals and current control signals based on the display control data and outputting the gray control signals and the current control signals to the constant current driving module;
the brightness adjusting module is connected with the constant current driving module and used for generating a corresponding brightness adjusting signal based on the display control data and outputting the brightness adjusting signal to the constant current driving module;
and the constant current driving module is used for outputting constant current based on the brightness adjusting signal, the gray control signal and the current control signal, and performing gray control and brightness adjustment on the LED.
Optionally, the driving chip further includes: the circuit comprises a decoupling capacitor, an open circuit detection unit and an over-temperature protection unit;
the decoupling capacitor is packaged in the driving chip and used for reducing power supply noise;
the open circuit detection unit is connected with an external power supply and is used for carrying out open circuit detection on the power supply;
the over-temperature protection unit is connected with an external power supply and used for performing over-temperature protection on the LED driving chip.
The invention provides a three-channel LED display unit in a second aspect, which comprises an LED driving chip, an LED light-emitting chip and a bracket, wherein the LED driving chip is input by a double signal source in any one of the first aspect;
the LED light-emitting chip comprises a red light chip, a green light chip and a blue light chip;
the LED driving chip, the LED light-emitting chip and the support are packaged into a whole by using packaging glue.
Optionally, the LED driving chip includes a red light output current pin, a green light output current pin, a blue light output current pin, a power supply positive electrode pin, a ground pin, an input pin, an output pin, and a bypass pin;
the anodes of the red light chip, the green light chip and the blue light chip are respectively and electrically connected with the red light output current pin, the green light output current pin and the blue light output current pin of the LED driving chip, and the cathode of the LED light-emitting chip is electrically connected with the grounding pin of the LED driving chip.
A third aspect of the present invention provides a dual-signal-source-input LED driving circuit, including: two controllers and a plurality of LED driving chips with double signal source input according to any one of the first aspect;
the LED driving chips are connected in a cascade mode, an input pin and a bypass pin of a first-stage LED driving chip are respectively connected with the output end of one controller, and an output pin and a bypass pin of a last-stage LED driving chip are respectively connected with the output end of the other controller;
the two controllers respectively output a first control signal and a second control signal, and the first control signal and the second control signal are mutually master and standby.
Optionally, the power supply positive pins of the LED driving chips are electrically connected to each other, and the ground pins of the LED driving chips are electrically connected to each other;
in the LED driving chips which are cascaded mutually, the input pin of the LED driving chip at the current stage is electrically connected with the output pin of the LED driving chip at the previous stage, and the bypass pin of the LED driving chip at the current stage is electrically connected with the input pin of the LED driving chip at the previous stage.
(III) advantageous effects
The invention has the beneficial effects that:
the invention provides a double-signal-source input LED driving chip, which comprises: the detection unit is used for outputting a detection signal according to data input by an input pin and a bypass pin of the LED driving chip; an input/output management unit for taking the input pin or the bypass pin as an input terminal and taking the output pin as an output terminal based on the detection signal; or, the output pin is used as the input end, and the input pin is used as the output end; the signal processing unit is used for receiving the control data, extracting display control data required by the LED driving chip at the current stage based on the detection signal, and outputting the rest control data through an output end; and the constant current control unit is used for receiving the display control data and controlling the working state of the LED connected with the constant current control unit according to the display control data.
The invention adopts double signal source input, wherein one signal source realizes double-path signal transmission, any one point is damaged, and the subsequent node uses a bypass signal, thereby not influencing the cascade transmission of control signals; when two adjacent points are damaged, the subsequent node can be automatically switched to a standby signal source to receive control data, so that the normal use of the subsequent node is ensured.
Drawings
Fig. 1 is a schematic structural diagram of a dual-signal-source-input LED driving chip according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a three-channel LED display unit according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a dual-signal-source-input LED driving circuit according to another embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a dual-signal-source-input LED driving circuit according to another embodiment of the present invention.
[ description of reference ]
100: a three-channel LED display unit; 200: an LED drive circuit;
110: an LED driving chip; 120: an LED light emitting chip;
111: a detection unit; 112: an input/output management unit; 113: a signal processing unit; 114: a constant current control unit;
131: a first controller; 132: a second controller.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the following specific examples are illustrative of the invention only and are not to be construed as limiting the invention. In addition, it should be noted that, in the case of no conflict, the embodiments and features in the embodiments in the present application may be combined with each other; for convenience of description, only portions related to the invention are shown in the drawings.
The first aspect of the present application provides a dual-signal-source-input LED driving chip, which includes:
the detection unit is used for detecting the running state of the superior LED driving chip according to the data input by the input pin and the bypass pin of the LED driving chip and outputting a detection signal;
the input and output management unit is connected with the detection unit and is used for taking an input pin or a bypass pin as an input end to receive the control data and taking an output pin as an output end to output the residual control data based on the detection signal; or, the output pin is used as an input end to receive the control data, and the input pin is used as an output end to output the rest control data;
the signal processing unit is connected with the detection unit and the input and output management unit, and is used for receiving control data input by the input end of the LED driving chip, extracting display control data required by the current-stage LED driving chip based on the detection signal, outputting the display control data to the constant current control unit, and outputting the residual control data after the display control data is extracted through the output end;
and the constant current control unit is connected with the signal processing unit and is used for receiving the display control data and controlling the working state of the LED connected with the constant current control unit according to the display control data.
In order to clearly illustrate the present invention, the present embodiment will be specifically and specifically described below with reference to fig. 1. Fig. 1 is a schematic structural diagram of an LED driving chip with dual signal source inputs according to an embodiment of the present invention, and as shown in fig. 1, the LED driving chip with dual signal source inputs according to the present invention includes: a detection unit 111, an input/output management unit 112, a signal processing unit 113, and a constant current control unit 114. In the figure, R denotes a red light output current pin, G denotes a green light output current pin, B denotes a blue light output current pin, DTKIn denotes an input pin, DTKOut denotes an output pin, and DTKBP denotes a bypass pin.
The detecting unit 111 detects an operating state of a preceding stage LED driving chip according to data input by an input pin and a bypass pin of the LED driving chip, and includes:
when the control data input by the input pin and the bypass pin are normal, the running state of the previous-stage LED driving chip is a normal state;
when the control data input by the input pin is abnormal and the control data input by the bypass pin is normal, the running state of the previous-stage LED driving chip is an abnormal state;
when the control data input by the input pin and the bypass pin are abnormal, the running states of the first two stages of LED driving chips are abnormal.
In this embodiment, the detection unit 111 is connected to the input/output management unit 112. The input/output management unit 112 receives the detection signal output by the detection unit 111, receives the control data through the input terminal based on the detection signal, and outputs the remaining control data through the output terminal, and specifically includes:
when the running state of the previous stage of LED driving chip is a normal state, taking an input pin as an input end to receive first control data, taking the first control data as control data, and taking an output pin as an output end to output residual control data;
when the running state of the previous stage of LED driving chip is an abnormal state, taking a bypass pin as an input end to receive second control data, taking the second control data as control data, and taking an output pin as an output end to output residual control data;
when the running state of the two current stages of LED driving chips is an abnormal state, the output pin is used as an input end to receive third control data, the third control data is used as control data, and the input pin is used as an output end to output residual control data.
It should be noted that, when the LED driving chip is directly connected to the first controller, the first control data is the same as the second control data, and both the first control data and the second control data are control data sent by the first controller; when the LED driving chip is connected to the LED driving chip, the first control data is different from the second control data, the first control data is the remaining control data output from the output terminal of the previous chip, and the second control data is the control data input from the input terminal of the previous chip, that is, the control data including the display control data of the previous chip. The first controller here is a controller that operates in the current driving circuit when there is no node failure or only a little failure in the LED driving circuit, that is, the controller outputs a control signal, and all driving chips receive control data from the controller.
When the LED driving chip is directly connected with the second controller, the third control data is control data sent by the second controller; when the LED driving chip is connected with the LED driving chip, the third control data is the residual control data output by the output end of the next-stage chip. Here, for the two driver chips, the LED driver chip close to the first controller is a front stage, and the LED driver chip close to the second controller is a rear stage.
In this embodiment, the signal processing unit 113 includes a processor, a configuration register, and an oscillator;
the processor is connected with the configuration register and used for processing the received control data, extracting the display control data of the driving chip, storing the display control data in the configuration register, carrying out clock synchronization and regeneration on the residual control data after the display control data is extracted based on the oscillator and the control data, and then sending the residual control data to the input and output management unit;
the configuration register is connected with the processor and used for storing display control data of the LED driving chip at the current stage;
the oscillator is connected with the processor and used for generating clock oscillation pulses of the chip.
In this embodiment, the constant current control unit 114 includes: the device comprises a gray level control and PWM module, a brightness adjusting module and a constant current driving module;
the gray control and PWM module is connected with the constant current driving module and used for generating corresponding gray control signals and current control signals based on the display control data and outputting the gray control signals and the current control signals to the constant current driving module;
the brightness adjusting module is connected with the constant current driving module and used for generating a corresponding brightness adjusting signal based on the display control data and outputting the brightness adjusting signal to the constant current driving module;
and the constant current driving module is used for outputting constant current based on the brightness adjusting signal, the gray control signal and the current control signal, and performing gray control and brightness adjustment on the LED.
The driving chip of the embodiment can adopt double-signal-source input, wherein one signal source realizes double-path signal transmission, any one point is damaged, and the subsequent node uses a bypass signal, so that the cascade transmission of the control signal is not influenced; when two adjacent points are damaged, the subsequent node can be automatically switched to a standby signal source to receive control data, so that the normal use of the subsequent node is ensured.
In some preferred embodiments, the driving chip further includes: the circuit comprises a decoupling capacitor, an open circuit detection unit and an over-temperature protection unit;
the decoupling capacitor is packaged in the driving chip and used for reducing power supply noise;
the open circuit detection unit is connected with an external power supply and is used for carrying out open circuit detection on the power supply;
the over-temperature protection unit is connected with an external power supply and used for performing over-temperature protection on the LED driving chip.
Decoupling capacitors are provided within the IC chip package to reduce parasitic parameters caused by longer connection paths, thereby improving electrical performance. When the constant current output is on, the open circuit detection module detects that the LED is disconnected, and the LED can be short-circuited to GND. The built-in over-temperature protection of the chip enables the LED driving power supply system to work more safely and reliably.
In a second aspect, the present invention further provides a three-channel LED display unit, fig. 2 is a schematic structural diagram of the three-channel LED display unit according to another embodiment of the present invention, and as shown in fig. 2, the three-channel LED display unit 100 includes the LED driving chip 110, the LED light emitting chip 120 and the bracket, which are input by the dual signal source according to the first aspect.
The LED light emitting chips 120 include a red chip, a green chip, and a blue chip.
The LED driving chip 110 includes a red light output current pin, a green light output current pin, a blue light output current pin, a power supply positive electrode pin, a ground pin, an input pin, an output pin, and a bypass pin.
The anodes of the red light chip, the green light chip and the blue light chip are respectively connected with the red light output current pin, the green light output current pin and the blue light output current pin of the LED driving chip 110 through gold threads, and the cathode of the LED light emitting chip 120 is connected with the grounding pin of the LED driving chip 110 through gold threads.
The LED driving chip 110, the LED light-emitting chip 120 and the support are packaged into a whole by using packaging glue, so that the LED light-emitting chip is controlled by the driving chip 110 in the lamp bead.
By packaging the LED driving chip 110 and the LED light-emitting chip 120 in one bracket, the original separate packaging process is simplified, the production cost is saved, and the production efficiency and the product reliability are improved.
In a third aspect, the present invention further provides a dual-signal-source LED driving circuit, and fig. 3 is a schematic structural diagram of a dual-signal-source LED driving circuit according to yet another embodiment of the present invention, as shown in fig. 3, the LED driving circuit 200 includes: two controllers, namely a first controller 131 and a second controller 132, and a plurality of LED driving chips 110 with dual signal source inputs as described in the first aspect above.
It should be noted that the number n of the driving chips is not limited here, and may be 4, 8, 16, or 32.
Fig. 4 is a schematic circuit diagram of a dual-signal-source-input LED driving circuit according to another embodiment of the present invention, where DTKIn denotes an input pin, DTKOut denotes an output pin, DTKBP denotes a bypass pin, VCC denotes a power supply positive pin, and GND denotes a ground pin. As shown in fig. 4, a plurality of LED driving chips 110 are cascade-connected, and the first-stage LED driving chip, i.e. the input pin DTKIn and the bypass pin DTKBP of the LED driving chip 1, are respectively connected to the output end of the first controller 131; an input pin DTKIn of a middle LED driving chip, namely the LED driving chip 2-LED driving chip n-1, is connected with an output pin DTKOut of a previous LED driving chip, the output pin DTKOut is connected with an input pin DTKIn of a next LED driving chip, and a bypass pin DTKBP is connected with an input pin of the previous LED driving chip; the output pin DTKOut and the bypass pin DTKBP of the last stage LED driving chip, i.e., the LED driving chip n, are connected to the output terminal of the second controller 132.
The two controllers respectively output a first control signal and a second control signal, and the first control signal and the second control signal are mutually master and standby.
In this embodiment, the power supply positive pins VCC of the LED driving chip 110 are electrically connected to each other, and the ground pins GND of the LED driving chip 110 are electrically connected to each other.
The double-signal-source-input LED driving circuit in the embodiment realizes the breakpoint continuous transmission function due to the double signal sources, and the normal operation of the LED on the whole link can not be influenced when the problems of node data input bypass, single point and two points occur.
It should be noted that in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. Furthermore, it should be noted that in the description of the present specification, the description of the term "one embodiment", "some embodiments", "examples", "specific examples" or "some examples", etc., means that a specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, the claims should be construed to include preferred embodiments and all changes and modifications that fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention should also include such modifications and variations.
Claims (10)
1. An LED driving chip with dual signal source input, the chip comprising:
the detection unit is used for detecting the running state of the superior LED driving chip according to the data input by the input pin and the bypass pin of the LED driving chip and outputting a detection signal;
the input and output management unit is connected with the detection unit and is used for taking an input pin or a bypass pin as an input end to receive control data and taking an output pin as an output end to output residual control data based on a detection signal; or, the output pin is used as an input end to receive the control data, and the input pin is used as an output end to output the rest control data;
the signal processing unit is connected with the detection unit and the input and output management unit, and is used for receiving control data input by the input end of the LED driving chip, extracting display control data required by the current-stage LED driving chip based on a detection signal, outputting the display control data to the constant current control unit, and outputting the residual control data after the display control data is extracted through the output end;
and the constant current control unit is connected with the signal processing unit and is used for receiving the display control data and controlling the working state of the LED connected with the constant current control unit according to the display control data.
2. The dual-signal-source-input LED driving chip according to claim 1, wherein detecting an operating state of a preceding LED driving chip according to data input from an input pin and a bypass pin of the LED driving chip comprises:
when the control data input by the input pin and the bypass pin are normal, the running state of the previous-stage LED driving chip is a normal state;
when the control data input by the input pin is abnormal and the control data input by the bypass pin is normal, the running state of the previous-stage LED driving chip is an abnormal state;
when the control data input by the input pin and the bypass pin are abnormal, the running states of the first two stages of LED driving chips are abnormal.
3. The dual-signal-source-input LED driving chip according to claim 2, wherein based on the detection signal, the input pin or the bypass pin is used as an input terminal to receive the control data, and the output pin is used as an output terminal to output the remaining control data; or, the method, which takes the output pin as the input end to receive the control data and takes the input pin as the output end to output the rest control data, includes:
when the running state of the previous stage of LED driving chip is a normal state, taking an input pin as an input end to receive first control data, taking the first control data as control data, and taking an output pin as an output end to output residual control data;
when the running state of the previous stage of LED driving chip is an abnormal state, taking a bypass pin as an input end to receive second control data, taking the second control data as control data, and taking an output pin as an output end to output residual control data;
when the running state of the two current stages of LED driving chips is an abnormal state, the output pin is used as an input end to receive third control data, the third control data is used as control data, and the input pin is used as an output end to output residual control data.
4. The dual-signal-source-input LED driving chip according to claim 1, wherein the signal processing unit comprises a processor, a configuration register, and an oscillator;
the processor is connected with the configuration register and used for processing the received control data, extracting the display control data of the driving chip, storing the display control data in the configuration register, carrying out clock synchronization and regeneration on the residual control data after the display control data is extracted based on the oscillator and the control data, and then sending the residual control data to the input and output management unit;
the configuration register is connected with the processor and used for storing display control data of the current-stage LED driving chip;
the oscillator is connected with the processor and used for generating clock oscillation pulses of the chip.
5. The dual-signal-source-input LED driving chip according to claim 1, wherein the constant current control unit comprises: the device comprises a gray level control and PWM module, a brightness adjusting module and a constant current driving module;
the gray control and PWM module is connected with the constant current driving module and used for generating corresponding gray control signals and current control signals based on the display control data and outputting the gray control signals and the current control signals to the constant current driving module;
the brightness adjusting module is connected with the constant current driving module and used for generating a corresponding brightness adjusting signal based on the display control data and outputting the brightness adjusting signal to the constant current driving module;
and the constant current driving module is used for outputting constant current based on the brightness adjusting signal, the gray control signal and the current control signal, and performing gray control and brightness adjustment on the LED.
6. The dual-signal-source-input LED driver chip according to any of claims 1-5, wherein the driver chip further comprises: the circuit comprises a decoupling capacitor, an open circuit detection unit and an over-temperature protection unit;
the decoupling capacitor is packaged in the driving chip and used for reducing power supply noise;
the open circuit detection unit is connected with an external power supply and is used for carrying out open circuit detection on the power supply;
the over-temperature protection unit is connected with an external power supply and used for performing over-temperature protection on the LED driving chip.
7. A three-channel LED display unit comprising the dual-signal-source-input LED driving chip, the LED light emitting chip and the support according to any one of claims 1 to 6;
the LED light-emitting chip comprises a red light chip, a green light chip and a blue light chip;
the LED driving chip, the LED light-emitting chip and the support are packaged into a whole by using packaging glue.
8. The three-channel LED display unit of claim 7, wherein the LED driver chip includes a red output current pin, a green output current pin, a blue output current pin, a power positive pin, a ground pin, an input pin, an output pin, a bypass pin;
the anodes of the red light chip, the green light chip and the blue light chip are respectively and electrically connected with the red light output current pin, the green light output current pin and the blue light output current pin of the LED driving chip, and the cathode of the LED light-emitting chip is electrically connected with the grounding pin of the LED driving chip.
9. A dual-signal-source-input LED driving circuit is characterized by comprising: two controllers and a plurality of dual signal source input LED driver chips as claimed in any one of claims 1 to 6;
the LED driving chips are connected in a cascade mode, an input pin and a bypass pin of a first-stage LED driving chip are respectively connected with the output end of one controller, and an output pin and a bypass pin of a last-stage LED driving chip are respectively connected with the output end of the other controller;
the two controllers respectively output a first control signal and a second control signal, and the first control signal and the second control signal are mutually master and standby.
10. The dual-signal-source-input LED driving circuit according to claim 9, wherein power supply positive pins of the LED driving chips are electrically connected to each other, and ground pins of the LED driving chips are electrically connected to each other;
in the LED driving chips which are cascaded mutually, the input pin of the LED driving chip at the current stage is electrically connected with the output pin of the LED driving chip at the previous stage, and the bypass pin of the LED driving chip at the current stage is electrically connected with the input pin of the LED driving chip at the previous stage.
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| CN112885294B (en) | 2023-04-07 |
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