CN112885293B - Three-channel LED display unit with built-in driving chip and display module - Google Patents
Three-channel LED display unit with built-in driving chip and display module Download PDFInfo
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- CN112885293B CN112885293B CN202110112662.8A CN202110112662A CN112885293B CN 112885293 B CN112885293 B CN 112885293B CN 202110112662 A CN202110112662 A CN 202110112662A CN 112885293 B CN112885293 B CN 112885293B
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- 238000003466 welding Methods 0.000 claims abstract 10
- 239000003292 glue Substances 0.000 claims abstract 2
- 238000004806 packaging method and process Methods 0.000 claims abstract 2
- 238000001514 detection method Methods 0.000 claims 3
- 239000003990 capacitor Substances 0.000 claims 2
- 230000001172 regenerating effect Effects 0.000 claims 2
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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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Abstract
The invention belongs to the technical field of LED display, and particularly relates to a three-channel LED display unit with a built-in driving chip. The three-channel LED display unit with the built-in driving chip comprises a support, an LED light-emitting chip and a driving chip, wherein the support, the LED light-emitting chip and the driving chip are packaged into a whole by using packaging glue; the bracket is provided with a welding cup structure connected with the driving chips, and the driving chips are connected with the bracket through the welding cup structures in a one-to-one correspondence manner; the anode of the LED light-emitting chip is electrically connected with the corresponding current output pin of the driving chip, and the cathode of the LED light-emitting chip is electrically connected with the grounding pin of the driving chip; the driving chip takes the input control signal of the adjacent driving chip as a bypass signal, and takes the bypass signal as a control signal when the driving chip detects that the received control signal is wrong. The display unit adopts two-way signal transmission, and the damage of any point does not influence the whole display effect.
Description
Technical Field
The invention belongs to the technical field of LED display, and particularly relates to a three-channel LED display unit with a built-in driving chip and a display module.
Background
The LED is called as a fourth generation illumination light source or a green light source, has the characteristics of energy conservation, environmental protection, long service life, small volume and the like, and is widely applied to the fields of various indications, display, decoration, backlight sources, common illumination, urban night scenes and the like. 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.
The existing LED display screen is generally composed of a plurality of independent LED display units arranged in an array, where each display unit includes an LED light emitting chip and a driving chip for driving the plurality of light emitting chips.
When the LED display unit is used, the situation that a single point is failed and damaged is inevitable. When one of the display screens formed by the existing LED display units breaks down, subsequent points influencing cascade transmission cannot be normally displayed, so that the normal use of the whole display screen is influenced, and the integral display effect is influenced.
Disclosure of Invention
Technical problem to be solved
In order to solve the above problems in the prior art, the invention provides a three-channel LED display unit with a built-in driving chip and a display module.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
the invention provides a three-channel LED display unit with a built-in driving chip, which comprises a bracket, an LED light-emitting chip and a driving chip, wherein the bracket, the LED light-emitting chip and the driving chip are packaged into a whole by using packaging glue,
the bracket is provided with a welding cup structure connected with the driving chips, and the driving chips are connected with the bracket through the welding cup structures in a one-to-one correspondence manner;
the anode of the LED light-emitting chip is electrically connected with a corresponding current output pin of the driving chip, and the cathode of the LED light-emitting chip is electrically connected with a grounding pin of the driving chip;
the driving chip takes an input control signal of an adjacent driving chip as a bypass signal, and when the driving chip detects that the received control signal is wrong, the bypass signal is taken as the control signal.
Optionally, the driving chip includes: the system comprises a packet processor, a multiplexer, a configuration register, an oscillator, a gray control and PWM module and a brightness adjusting module;
the packet processor is connected with the multiplexer and the configuration register and used for processing the received control signals, extracting the control command of the driving chip, storing the control command in the configuration register, carrying out clock synchronization based on the built-in oscillator and the control signals, and regenerating and sending the control signals of the follow-up three-channel LED display unit to the multiplexer;
the configuration register is connected with the packet processor and the gray control and PWM module and is used for storing a control command of the driving chip and controlling the gray control and PWM module to output corresponding gray control signals and current control signals based on the control command;
the multiplexer is used for multiplexing the received control signal, the bypass signal and the control signal of the subsequent three-channel LED display unit and then outputting the multiplexed control signal;
the oscillator is connected with the packet processor and used for generating clock oscillation pulses of the chip;
the gray control and PWM module is connected with the configuration register and the constant current driving module and is used for outputting corresponding gray control signals and current control signals based on the control command, outputting constant current through the constant current driving module and performing gray control;
the brightness adjusting module is connected with the configuration register and the constant current driving module and is used for acquiring brightness adjusting information from the configuration register and controlling the constant current driving module to adjust the brightness based on the brightness adjusting information;
the constant current driving module is connected with the brightness adjusting module and the gray level control and PWM module and is used for outputting constant current and carrying out gray level control and brightness adjustment.
Optionally, the driver chip includes a data input pin, a data output pin, and a data input bypass pin; the data input pin is electrically connected with the data output pin of the adjacent driving chip, and the data input bypass pin is electrically connected with the data input pin of the adjacent driving chip.
Optionally, the data output from the data output pin is obtained by multiplexing the data input from the data input pin and the data input from the data input bypass pin with regenerated data, where the regenerated data is obtained by regenerating control data of a subsequent driver chip by the driver chip after receiving the control data of the driver chip.
Optionally, the driving chip further includes: the circuit comprises a decoupling capacitor, an open circuit detection module and an over-temperature protection module;
the decoupling capacitor is packaged in the driving chip and used for reducing power supply noise;
the open circuit detection module is connected with the power supply and is used for carrying out LED open circuit detection on the power supply;
the over-temperature protection module is connected with the power supply and the configuration register and used for performing over-temperature protection on the three-channel LED display unit and storing an over-temperature protection command to the configuration register.
Optionally, the gray scale control and PWM module implements pulse width modulation for 12-bit gray scale control.
Optionally, the 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, a data input pin, a data output pin, an analog ground pin, and a data input bypass pin.
Optionally, the LED light emitting chip includes a red light chip, a green light chip, and a blue light chip;
one end of the red light chip is connected with the red light output current pin through a gold wire, and the other end of the red light chip is connected to the grounding welding cup of the bracket through a gold wire;
one end of the green light chip is connected with the green light output current pin through a gold wire, and the other end of the green light chip is connected to the grounding welding cup of the bracket through a gold wire;
one end of the blue light chip is connected with the blue light output current pin through a gold thread, and the other end of the blue light chip is connected with the grounding welding cup of the support through a gold thread.
The invention provides an LED display module, which comprises a circuit board and a plurality of display units positioned on the circuit board;
the display unit adopts a three-channel LED display unit with a built-in driving chip as described in any one of the first aspect;
the power supply anode welding cups of the three-channel LED display unit are electrically connected with each other, and the grounding welding cups of the three-channel LED display unit are electrically connected with each other;
in the plurality of display units, the data input welding cup of one three-channel LED display unit in two adjacent display units is electrically connected with the data output welding cup of the other three-channel LED display unit, and the data input bypass welding cup of one three-channel LED display unit in two adjacent display units is electrically connected with the data input welding cup of the other three-channel LED display unit.
(III) advantageous effects
The beneficial effects of the invention are:
the three-channel LED display unit with the built-in driving chip comprises a support, an LED light-emitting chip and a driving chip, wherein the support, the LED light-emitting chip and the driving chip are packaged into a whole by using packaging glue; the bracket is provided with a welding cup structure connected with the driving chips, and the driving chips are connected with the bracket through the welding cup structures in a one-to-one correspondence manner; the anode of the LED light-emitting chip is electrically connected with the corresponding current output pin of the driving chip, and the cathode of the LED light-emitting chip is electrically connected with the grounding pin of the driving chip; the driving chip takes the input control signal of the adjacent driving chip as a bypass signal, and takes the bypass signal as a control signal when the driving chip detects that the received control signal is wrong.
According to the invention, through additionally adding a signal line, double-path signal transmission is realized, and the cascade transmission of signals cannot be influenced when any one point is damaged, so that the integral display effect is not influenced by single-point failure completely in use.
Drawings
Fig. 1 is a schematic structural diagram of a three-channel LED display unit with a built-in driving chip according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a driving chip according to an embodiment of the present invention;
fig. 3 is an internal functional block diagram of a driving chip according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of an LED display module according to another embodiment of the present invention.
[ description of reference ]
110: a support; 120: a driving chip;
111: a grounding welding cup; 112: simulating a grounding welding cup; 113: inputting data into a welding cup; 114: a data output welding cup; 115: data input bypass weld cups; 116: welding a power supply anode;
121: a ground pad; 122: simulating a grounding pad; 123: a data input pad;
124: a data output pad; 125: a data input bypass pad; 126: a power supply positive electrode pad;
127: a red light output current pad; 128: a green light output current pad; 129: a blue light output current pad;
131: a red light chip; 132: a green chip; 133: and a blue light chip.
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.
A first aspect of the present application provides a three-channel LED display unit with a built-in driving chip, which includes a support, an LED light-emitting chip, and a driving chip, wherein the support, the LED light-emitting chip, and the driving chip are packaged together using a packaging adhesive, the support is provided with a solder cup structure connected to the driving chip, and the driving chip is connected to the support through the solder cup structure in a one-to-one correspondence; the anode of the LED light-emitting chip is electrically connected with a corresponding current output pin of the driving chip, and the cathode of the LED light-emitting chip is electrically connected with a grounding pin of the driving chip;
the driving chip takes the input control signal of the adjacent driving chip as a bypass signal, and takes the bypass signal as a control signal when the driving chip detects that the received control signal is wrong.
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 a three-channel LED display unit with a built-in driving chip according to an embodiment of the present invention, as shown in fig. 1, the three-channel LED display unit with a built-in driving chip according to the present invention includes: support 110, LED luminescence chip, drive chip 120.
The support 110 is provided with a grounding welding cup (GNDD) 111, a simulated grounding welding cup (GNDA) 112, a data input welding cup (DTKIn) 113, a data output welding cup (DTKOut) 114, a data input bypass welding cup (DTKBP) 115 and a power supply positive electrode welding cup (VCC) 116; a power supply anode pin, a grounding pin, a data input pin, a data output pin, a simulation grounding pin and a data input bypass pin are respectively connected to the power supply anode welding cup 116, the grounding welding cup 111, the data input welding cup 113, the data output welding cup 114, the simulation grounding welding cup 112 and the data input bypass welding cup 115 of the bracket.
The driving chip 120 comprises 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 grounding pin, a data input pin, a data output pin, an analog grounding pin and a data input bypass pin;
the LED light-emitting chip is respectively connected with the grounding welding cup 111 and the red light output current pin, the green light output current pin and the blue light output current pin of the driving chip through gold wires;
the power supply positive pin, the grounding pin, the data input pin, the data output pin, the analog grounding pin and the data input bypass pin of the driving chip are respectively connected with the power supply positive electrode welding cup 116, the grounding welding cup 111, the data input welding cup 113, the data output welding cup 114, the analog grounding welding cup 112 and the data input bypass welding cup 115 of the bracket 110 through gold wires.
In this embodiment, the LED light emitting chip includes a red light chip, a green light chip, and a blue light chip; the driving chip includes a plurality of connection pads. Fig. 2 is a schematic structural diagram of a driving chip according to an embodiment of the present invention, and as shown in fig. 2, the driving chip includes a ground pad 121, an analog ground pad 122, a data input pad 123, a data output pad 124, a data input bypass pad 125, a power supply positive pad 126, a red light output current pad 127, a green light output current pad 128, and a blue light output current pad 129.
One end of the red light chip is connected with the red light output current pad 127 through a gold wire, and the other end of the red light chip is connected to the grounding welding cup 111 through a gold wire;
one end of the green chip is connected with a green output current pad 128 through a gold wire, and the other end of the green chip is connected with the grounding welding cup 111 through a gold wire;
one end of the blue light chip is connected with the blue light output current pad 129 through a gold wire, and the other end is connected to the grounding welding cup 111 through a gold wire.
The support 110, the LED light-emitting chip and the driving chip 120 are packaged into a whole by using packaging glue, so that the driving chip 121 in the lamp bead controls the LED light-emitting chip.
By packaging the driving chip 120 and the LED light emitting chip in one support 100, the original separate packaging process is simplified, the production cost is saved, and the production efficiency and the product reliability are improved.
Fig. 3 is an internal functional block diagram of a driver chip according to an embodiment of the present invention, where, as shown in fig. 3, R denotes a red light output current pin, G denotes a green light output current pin, B denotes a blue light output current pin, VCC denotes a power supply positive electrode pin, GND denotes ground and analog ground, DTKIn denotes a data input pin, DTKOut denotes a data output pin, and DTKBP denotes a data input bypass pin. The driving chip includes: the system comprises a packet processor, a multiplexer, a configuration register, an oscillator, a gray control and PWM module, a brightness adjusting module, a constant current driving module, an over-temperature protection module and an open circuit detection module; the packet processor is connected with the multiplexer, the configuration register, the oscillator, the gray control and PWM module, the data input pin and the data input bypass pin, and the configuration register is connected with the packet processor, the gray control and PWM module and the brightness adjusting module; the multiplexer is connected with the data input pin, the data output pin, the data input bypass pin and the packet processor; an oscillator coupled to the packet processor; the gray control and PWM module is connected with the configuration register and the constant current driving module; and the brightness adjusting module is connected with the configuration register and the constant current driving module. The open circuit detection module is connected with the power supply, and the over-temperature protection module is connected with the power supply and the configuration register.
The driving chip in this embodiment includes an open circuit detection module for performing LED open circuit detection on the power supply, and an over-temperature protection module for performing over-temperature protection. When the constant current output is turned on, the open circuit detection module detects that the LED is disconnected, and the LED is 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.
The input control signal of the input port DTK is processed by a packet processor to input the data packet of the control signal, the control command of the driving chip is extracted and stored in a configuration register, wherein the packet processor is connected with an oscillator, and the oscillator is used for generating the clock oscillation pulse of the chip so as to be used for packet processing. The gray scale control and PWM module has a Pulse Width Modulation (PWM) adjustment function of 12-bit gray scale control, and outputs a constant current through the constant current driving module. The current value range of the output of the 3 constant current output channels is 0-18mA, the error among the channels is lower than 3%, the error among the chips is lower than 3%, and the gray data is input through a DTK port. The current driving chip also has the function of integral brightness adjustment, and 64-level brightness control can be realized through the brightness adjustment module.
The driving chip carries out clock synchronization according to signals on the data line based on a built-in oscillator, the packet processor can automatically regenerate and send subsequent data to the multiplexer after receiving the data of the unit, the multiplexer multiplexes input signals of the DTK port, bypass signals of the DTKBP port and regenerated data output by packet processing and sends the multiplexed data to a lower stage through the data output port DTKOUT, and the signals are not distorted or attenuated along with cascade connection.
Since the driver chip integrates multiple devices on a single chip, the devices become more sensitive to power/ground noise. Voltage drops are induced when multiple output channels are switched simultaneously. While the switch momentarily raises the ground voltage within the device relative to the system ground. This shift of the ground potential to a non-zero value is referred to as simultaneous switching noise. While switching noise can cause the logic circuit to erroneously switch states, switching can also cause problems in signal timing and quality, such as signal attenuation during rise time, signal path propagation delay distortion, and increased signal overshoot.
The decoupling capacitors in this embodiment are disposed within the IC chip package to reduce parasitic parameters caused by longer connection paths, thereby improving electrical performance.
The data input pins of the driving chips are used for being connected with the data output pins of the adjacent driving chips or the preset driving chips, the data input bypass pins are used for being connected with the data input pins of the adjacent driving chips or the preset driving chips, and the data output pins are used for being connected with the data input pins of the adjacent driving chips.
In the embodiment, the three-channel LED display unit is provided with the data input bypass pin, so that the function of intermittent continuous transmission is realized, the data input bypass of the node (from the previous node) is realized, and the subsequent transmission cannot be influenced when a single point has a problem.
Further, the driving chip 121 adopts static constant current driving and supports a PWM dimming technology.
In a second aspect, the present invention further provides an LED display module, and fig. 3 is a schematic circuit diagram of an LED display module according to another embodiment of the present invention, as shown in fig. 3, the LED display module includes a circuit board and a plurality of display units located on the circuit board;
the display unit adopts the three-channel LED display unit with the built-in driving chip;
the power supply positive electrode welding cups (VCC) of the three-channel LED display unit are electrically connected with each other, and the grounding welding cups (GND) of the three-channel LED display unit are electrically connected with each other;
in the plurality of display units, a data input soldering cup (DTKIn) of one three-channel LED display unit in two adjacent display units is electrically connected with a data output soldering cup (DTKout) of the other three-channel LED display unit, and a data input bypass soldering cup (DTKBP) of one three-channel LED display unit in two adjacent display units is electrically connected with a data input soldering cup (DTKIn) of the other three-channel LED display unit.
Specifically, in the embodiment of the present invention, the circuit board may be a circuit board with a double-layer conductive layer, or may be a multilayer circuit board with a plurality of conductive layers, and the embodiment of the present invention is not limited herein. The controller controls the display module according to a preset program to enable the LED array to regularly emit light, so that characters or graphs are displayed. In this embodiment, the maximum display unit can reach 2048 points.
By adopting the three-channel LED display unit in the embodiment, the decoupling capacitor is arranged in the driving chip, so that a bypass capacitor is not needed on the circuit board. According to the embodiment, the signal line is additionally added to realize double-path signal transmission, and the cascade transmission of signals cannot be influenced by any point damage, so that the whole display effect is not influenced by single-point faults completely in use.
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 such variations and modifications as 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 (5)
1. An LED display module is characterized by comprising a circuit board and a plurality of display units positioned on the circuit board;
the display unit adopts a three-channel LED display unit with a built-in driving chip;
the power supply anode welding cups of the three-channel LED display unit are electrically connected with each other, and the grounding welding cups of the three-channel LED display unit are electrically connected with each other;
in the plurality of display units, a data input welding cup of one three-channel LED display unit in two adjacent display units is electrically connected with a data output welding cup of the other three-channel LED display unit, and a data input bypass welding cup of one three-channel LED display unit in two adjacent display units is electrically connected with a data input welding cup of the other three-channel LED display unit;
wherein, the three-channel LED display unit with the built-in driving chip comprises a bracket, an LED light-emitting chip and a driving chip, the bracket, the LED light-emitting chip and the driving chip are packaged into a whole by using packaging glue,
the bracket is provided with a welding cup structure connected with the driving chips, and the driving chips are connected with the bracket through the welding cup structures in a one-to-one correspondence manner;
the anode of the LED light-emitting chip is electrically connected with a corresponding current output pin of the driving chip, and the cathode of the LED light-emitting chip is electrically connected with a grounding pin of the driving chip;
the driving chip takes an input control signal of an adjacent driving chip as a bypass signal, and when the driving chip detects that the received control signal is wrong, the bypass signal is taken as a control signal; the driving chip includes: the system comprises a packet processor, a multiplexer, a configuration register, an oscillator, a gray control and PWM module, a brightness adjusting module and a constant current driving module;
the packet processor is connected with the multiplexer, the configuration register, the data input pin and the data input bypass pin, and is used for processing the received control signal, extracting the control command of the driving chip, storing the control command in the configuration register, performing clock synchronization based on the built-in oscillator and the control signal, and regenerating and sending the control signal of the follow-up three-channel LED display unit to the multiplexer;
the configuration register is connected with the packet processor and the gray control and PWM module and is used for storing a control command of the driving chip and controlling the gray control and PWM module to output corresponding gray control signals and current control signals based on the control command;
the multiplexer is connected with the packet processor, the data input pin and the data input bypass pin, and is used for multiplexing and outputting the received control signal, the bypass signal and the control signal of the subsequent three-channel LED display unit;
the oscillator is connected with the packet processor and used for generating clock oscillation pulses of the chip;
the gray control and PWM module is connected with the configuration register and the constant current driving module and is used for outputting corresponding gray control signals and current control signals based on the control command, outputting constant current through the constant current driving module and performing gray control;
the brightness adjusting module is connected with the configuration register and the constant current driving module and is used for acquiring brightness adjusting information from the configuration register and controlling the constant current driving module to adjust the brightness based on the brightness adjusting information;
the constant current driving module is connected with the brightness adjusting module and the gray level control and PWM module and is used for outputting constant current and performing gray level control and brightness adjustment;
the driving chip comprises a data input pin, a data output pin and a data input bypass pin; the data input pin is electrically connected with the data output pin of the adjacent driving chip, and the data input bypass pin is electrically connected with the data input pin of the adjacent driving chip;
the data output by the data output pin is obtained by multiplexing the data input by the data input pin and the data input by the data input bypass pin with regeneration data, and the regeneration data is obtained by regenerating the control data of a subsequent driving chip after the driving chip receives the control data of the driving chip.
2. The LED display module of claim 1, wherein the driving chip further comprises: the circuit comprises a decoupling capacitor, an open circuit detection module and an over-temperature protection module;
the decoupling capacitor is packaged in the driving chip and used for reducing power supply noise;
the open circuit detection module is connected with the power supply and is used for carrying out LED open circuit detection on the power supply;
the over-temperature protection module is connected with the power supply and the configuration register and used for performing over-temperature protection on the three-channel LED display unit and storing an over-temperature protection command to the configuration register.
3. The LED display module of claim 2, wherein the gamma control and PWM module implements pulse width modulation for 12-bit gamma control.
4. The LED display module of any of claims 1-3, wherein the driver chip comprises a red output current pin, a green output current pin, a blue output current pin, a positive power pin, a ground pin, a data input pin, a data output pin, an analog ground pin, and a data input bypass pin.
5. The LED display module of claim 4, wherein the LED light-emitting chips comprise a red chip, a green chip and a blue chip.
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| CN117496877A (en) * | 2023-03-28 | 2024-02-02 | 惠州华星光电显示有限公司 | LED driver chip and light-emitting substrate |
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| TWI477961B (en) * | 2012-06-26 | 2015-03-21 | Silicon Touch Tech Inc | Chip applied to serial transmission system and associated fail safe method |
| CN104900191A (en) * | 2015-06-30 | 2015-09-09 | 深圳市金誉半导体有限公司 | Tri-channel LED driver chip |
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