Multi-pixel master LED lamp bead and LED display module

Abstract

The application discloses a multi-pixel master LED lamp bead and an LED display module, which comprises a lamp bead support, a light emitting chip, a driving chip and a pin; the driving chip comprises a light emitting control unit for controlling the light emitting state of the light emitting chip or an accessed controlled LED lamp bead, a data transmission unit for receiving control data from an upstream device and sending the control data to a downstream device, and a master control unit for obtaining the control data of the light emitting chip and the accessed controlled LED lamp bead from a data stream transmitted from the data transmission unit, and controlling the light emitting state of the light emitting chip and the plurality of accessed controlled LED lamp beads through the light emitting control unit. The application completes display control by driving a group of common controlled LED lamp beads through the multi-pixel master LED lamp bead, improves the stability of the LED display screen, reduces the device cost, and has the advantages of simple wiring, light structure and high refresh rate.

Description

Technical Field

[0001] This invention relates to the field of optoelectronic semiconductor devices, and more particularly to an LED display device and an LED display module. Background Technology

[0002] In applications such as intelligent light control, optoelectronic glass, and intelligent displays, arrays of serial LED beads are typically used to achieve light adjustment, color control, and image display. Depending on the specific application, various display effects can be achieved, including multi-color illumination, dazzling effects, flowing water effects, running lights, and alternating flashing effects. Examples include lighting effects for drone swarms, balance scooter decorations, children's shoe decorations, outdoor lighting projects, landscape lighting, and stage atmosphere rendering lights. The implementation process requires a main control chip to issue command signals based on a control program to control the color channel grayscale combination, brightness, and other parameters of each LED bead. To ensure the accuracy of the display effect, a control IC is usually embedded inside each LED bead, enabling single-bead programmability, independent addressing control, single-point control, multi-point transmission, and point-by-point scanning functions to precisely control the execution parameters of each LED bead.

[0003] In existing technologies, the control architecture of LED displays implemented using return-to-zero code serial data transmission is as follows: Figure 1 As shown. The main control board outputs M sets of control signals simultaneously to control the display of M rows of pixels. For each row of pixels, N LED beads are connected in parallel between the positive and negative terminals of the power supply. The control signal is output from the main control board to the signal input terminal DIN of the first LED bead. After that, the signal input terminal DIN of each LED bead is connected to the signal output terminal DOUT of the previous LED bead. The main control board outputs N control signals to each row of pixels. After each LED bead receives its own control signal, it transmits the remaining control signal to the next LED bead. The disadvantages of this method are: (1) When a certain LED bead is damaged, the subsequent signal transmission will be terminated, causing all subsequent LED beads to be unable to receive the control signal and thus unable to light up; (2) The signal transmission frequency of this method is only about 800Khz, which cannot make a high refresh rate display screen. The high-speed control system needs to accommodate the low-speed LED beads, resulting in a low load capacity of a single control card and increased cost; (3) Each LED bead is a combined lamp driver, which makes the cost of making the display screen too high.

[0004] In existing technologies, LED display control architectures that utilize parallel data transmission via address codes are as follows: Figure 2As shown. The main control board simultaneously outputs M sets of control signals to control the display of M rows of pixels. For each row of pixels, N LEDs are connected in parallel between the positive and negative terminals of the power supply. The signal input terminal DIN of each LED is sequentially connected in parallel to a signal input line. The main control board inputs N control signals to each row of pixels. Each control signal includes display data and address information. The address information of each LED is fixed at the factory to form the address code LED. Parallel data transmission using address codes can avoid the situation where the failure of one LED causes all subsequent LEDs to be unable to receive control signals. However, this method still has shortcomings: (1) Since there are usually 64 common address formats for LEDs in the industry, LEDs of the same specification will have 64 different address formats, which can easily lead to the mixing of LEDs of the same specification but different address formats. This makes subsequent processing difficult, and it is also necessary to match the corresponding address format LED for replacement during maintenance; (2) When the number of LEDs serially connected to the same pixel exceeds 64, the 64 LEDs in the second segment need to have a second supply signal port added to the motherboard. During linear transmission, The control signal given by the second supply signal port needs to bypass the 64 LEDs in the first section and start from the 65th LED. If there are 64 LEDs in the third section, a third supply signal port needs to be added to the motherboard. The control signal given by the third supply signal port needs to bypass the 64 LEDs in the first and second sections and start from the 129th LED... and so on. This results in increased wiring space, more wiring, and the need to widen the circuit board accordingly, affecting the wiring layout and usage effect of dimming glass, smart display screen, and especially transparent display screen. (3) The control communication requires the transmission of address codes, which is cumbersome, has a low speed, and high display screen manufacturing cost.

[0005] In existing technologies, the control architecture of LED displays with separate lamp drivers is as follows: Figure 3 As shown, the pixels of this LED display are all ordinary LED beads. The main control board sends power signals row by row through a decoder chip, which powers the ordinary LED beads row by row. The LED display driver chip then controls the light-emitting state of the column pixels. Although the constituent pixels of this type of LED display are all ordinary LED beads, multiple decoder chips and LED display driver chips are required to complete the display control. This increases the cost of the components and also requires additional power, communication, chip select, and latch signal lines, making the overall wiring of the display complex, with many peripheral components, a bulky overall structure, and a low refresh rate. This makes it difficult to support lightweight applications such as transparent displays and UAV-borne displays. Summary of the Invention

[0006] To overcome the shortcomings of existing LED display technologies, such as unstable signals, high device costs, low refresh rates, complex wiring, and bulky structures, this invention proposes a multi-pixel master-controlled LED bead and an LED display module. The multi-pixel master-controlled LED bead drives a group of ordinary controlled LED beads to complete the display control. This improves the stability of the LED display while reducing device costs, and also has the advantages of simple wiring, lightweight structure, and high refresh rate.

[0007] This invention provides the following solution:

[0008] According to the first aspect, the present invention proposes a multi-pixel master-controlled LED bead for constituting an LED display screen, including a bead support, and a light-emitting chip, a driver chip, and pins disposed on the bead support and electrically connected to each other.

[0009] The pins include:

[0010] A light-emitting power supply pin used to provide power input to the light-emitting chip;

[0011] Pixel access pins used for connecting multiple controlled LED beads;

[0012] A drive power supply pin for providing power input to the driver chip; and

[0013] Communication pins used to provide communication connections for the driver chip;

[0014] The driver chip includes:

[0015] A light-emitting control unit is connected to the light-emitting chip and the pixel access pin, and is used to control the light-emitting state of the light-emitting chip or the connected controlled LED beads;

[0016] A data transmission unit, connected to the communication pin, is used to receive control data from upstream devices and to send control data to downstream devices; and

[0017] The main control unit connects the light-emitting control unit and the data transmission unit. It is used to obtain control data of the light-emitting chip and the connected controlled LED beads from the data stream transmitted from the data transmission unit, and to control the light-emitting state of the light-emitting chip and the multiple connected controlled LED beads through the light-emitting control unit.

[0018] In some embodiments, the driver chip further includes a voltage regulator unit, the power supply input terminal of which is connected to an external power supply through a power supply port and a ground port, for powering the driver chip.

[0019] In some embodiments, the light-emitting control unit includes a brightness control subunit and / or a grayscale control subunit. The negative power supply terminal of the light-emitting chip or the controlled LED bead is electrically connected to the negative terminal of an external power supply through the brightness control subunit and / or the grayscale control subunit. The brightness control subunit is used to control the brightness of the light-emitting chip or the connected controlled LED bead, and the grayscale control subunit is used to control the grayscale level of each color channel of the light-emitting chip or the connected controlled LED bead.

[0020] In some embodiments, the communication pin includes a data input pin, a clock input pin, a data output pin, and a clock output pin;

[0021] The data transmission unit includes: a receive register, a clock processor, and a transmit register;

[0022] The receiving register is connected to the data input pin, the clock input pin, and the main control unit, and is used to receive data from upstream devices and transmit data to the main control unit.

[0023] The clock processor is connected to the clock input pin, the transmit register, and the clock output pin. It receives clock signals from upstream devices, shapes them, and outputs them to the transmit register and the clock output pin.

[0024] The transmit register is connected to the main control unit and the data output pin, and is used to output the data to be transmitted to the downstream device to the data output pin.

[0025] In some embodiments, the clock input pins, clock output pins, and clock processor are each in two sets.

[0026] According to the second aspect, this application provides a multi-pixel master-controlled LED bead, which, based on the multi-pixel master-controlled LED bead of the first aspect, includes the following pixel access pins:

[0027] The pixel access pin for connecting multiple controlled LEDs in the same column as the multi-pixel master LED; and

[0028] Used to connect to other column pixel access pins of multiple controlled LEDs in a different column than the multi-pixel master LED.

[0029] According to a third aspect, this application provides a multi-pixel master-controlled LED bead, which, based on the multi-pixel master-controlled LED bead of the second aspect, further includes the following pins:

[0030] The first row of pixel power supply pins is used to provide power access to multiple controlled LEDs that are connected in the same row as the multi-pixel master LED.

[0031] The remaining row of pixel power supply pins are used to provide power access for multiple controlled LEDs that are not in the same row as the multi-pixel master LED.

[0032] The driver chip also includes:

[0033] The row selection module is connected to the main control unit, the light-emitting power supply pin, the first row pixel power supply pin, and the remaining row pixel power supply pins. It is used to connect the light-emitting power supply pin to a selected pin, including the first row pixel power supply pin and the remaining row pixel power supply pins, according to the control of the main control unit.

[0034] According to the fourth aspect, this application provides an LED display module, including a pixel matrix and a main control board. Each column pixel of the pixel matrix includes a multi-pixel main control LED bead located at the beginning according to the first aspect, and a plurality of controlled LED beads connected to the pixel access pin of the multi-pixel main control LED bead.

[0035] The first row of pixels in the pixel matrix consists of the multi-pixel master-controlled LED beads, while the remaining rows of pixels in the pixel matrix consist of controlled LED beads.

[0036] The first row scan output port of the main control board is connected to the light-emitting power supply pin of the multi-pixel main control LED lamp bead, and the remaining row scan output ports of the main control board are respectively connected to the power supply positive terminal of each row of pixels. The main control board controls the power supply to each row of pixels one by one.

[0037] The data port of the main control board is serially connected to the communication pin of the multi-pixel main control LED bead.

[0038] According to a fifth aspect, this application provides an LED display module, including a pixel matrix and a main control board. The pixel matrix includes multiple sub-matrices. The first pixel of the first column of the sub-matrices is a multi-pixel main control LED bead as described in the second aspect. The remaining pixels of the first column of the sub-matrices are controlled LED beads connected to the pixel access pins of the same column of the multi-pixel main control LED bead. The remaining columns of the sub-matrices are controlled LED beads connected to the pixel access pins of other columns of the multi-pixel main control LED bead.

[0039] The first row of pixels in the pixel matrix includes the multi-pixel master-controlled LED beads and the controlled LED beads, and the remaining rows of pixels in the pixel matrix are controlled LED beads.

[0040] The first row scan output port of the main control board is connected to the light-emitting power supply pin of the multi-pixel main control LED beads in multiple sub-matrices, as well as the power supply positive terminal of the controlled LED beads in the first row of pixels. The remaining row scan output ports of the main control board are respectively connected to the power supply positive terminals of the remaining rows of pixels. The main control board controls the power supply to each row of pixels row by row.

[0041] The data port of the main control board is serially connected to the communication pin of the multi-pixel main control LED bead.

[0042] According to a sixth aspect, this application provides an LED display module, including a pixel matrix and a main control board. The pixel matrix includes multiple sub-matrices. The first pixel of the first column of the sub-matrices is a multi-pixel main-controlled LED bead as described in the third aspect. The remaining pixels of the first column of the sub-matrices are controlled LED beads connected to the pixel access pins of the same column of the multi-pixel main-controlled LED bead. The remaining columns of the sub-matrices are controlled LED beads connected to the pixel access pins of other columns of the multi-pixel main-controlled LED bead.

[0043] The first row of pixels in the pixel matrix includes the multi-pixel master-controlled LED beads and the controlled LED beads, and the remaining rows of pixels in the pixel matrix are controlled LED beads.

[0044] The row scan power supply port of the main control board is connected to the light-emitting power supply pin of the multi-pixel main control LED beads in multiple sub-matrices, and the first row pixel power supply pin of the multi-pixel main control LED beads is connected to the positive power supply terminal of the controlled LED beads in the first row of pixels in the same sub-matrices.

[0045] The power supply pins of the remaining rows of pixels of the multi-pixel master control LED are respectively connected to the positive power supply terminals of the remaining rows of pixels in the same sub-matrix. The driver chip of the multi-pixel master control LED controls the power supply to each row of pixels in the same sub-matrix row by row.

[0046] The data port of the main control board is serially connected to the communication pin of the multi-pixel main control LED bead.

[0047] This application has the following advantages compared with the prior art:

[0048] The multi-pixel master-controlled LED bead and LED display module proposed in this application can control the light-emitting state of its own light-emitting chip and the connected controlled LED beads by connecting to multiple controlled LED beads simultaneously. If some of the connected controlled LED beads are damaged, it will not affect the working state and signal control of the remaining controlled LED beads, thus improving the stability of the LED display screen. In addition, this application only requires one multi-pixel master-controlled LED bead to drive multiple ordinary LED beads to form a partial pixel array. Compared with the existing LED display control architecture that uses return-to-zero code serial data transmission and address code parallel data transmission, it can greatly reduce the device cost of the LED display screen. Moreover, the multiple multi-pixel master-controlled LED beads of this application can be connected through serial communication to form a larger-scale LED display array, which simplifies the wiring of the LED display screen, makes the structure lightweight, and supports lightweight applications such as transparent displays and UAV-borne displays. Attached Figure Description

[0049] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0050] Figure 1 This is a schematic diagram of the control architecture of an LED display screen implemented using the return-to-zero code serial data transmission method in existing technology;

[0051] Figure 2 This is a schematic diagram of the control architecture of an LED display screen implemented using parallel data transmission of address codes in the existing technology;

[0052] Figure 3 This is a schematic diagram of the existing LED display control architecture with separate lamp drivers;

[0053] Figure 4 This is a schematic diagram of the structure of an embodiment of the multi-pixel main control LED lamp bead of this application;

[0054] Figure 5 This is a schematic diagram of the electrical structure of an embodiment of a multi-pixel main control LED lamp bead according to this application;

[0055] Figure 6 This is a schematic diagram of the electrical structure of the light-emitting control unit in some embodiments of this application;

[0056] Figure 7 This is a schematic diagram of the electrical structure of the data transmission unit in some embodiments of this application;

[0057] Figure 8This is a schematic diagram of the electrical structure of the data transmission unit in some embodiments of this application;

[0058] Figure 9 This is a schematic diagram of an embodiment of the LED display module of this application;

[0059] Figure 10 This is a schematic diagram of the structure of an embodiment of the multi-pixel main control LED lamp bead of this application;

[0060] Figure 11 This is a schematic diagram of an embodiment of the LED display module of this application;

[0061] Figure 12 This is a schematic diagram of the structure of an embodiment of the multi-pixel main control LED lamp bead of this application;

[0062] Figure 13 This is a schematic diagram of an embodiment of the LED display module of this application.

[0063] In the picture:

[0064] 100. Multi-pixel main control LED bead; 110. LED bead bracket; 120. Light-emitting chip; 130. Driver chip; 131. Light-emitting control unit; 1311. Brightness control subunit; 13111. Operational amplifier; 13112. NMOS transistor; 13113. Digital-to-analog converter; 1312. Grayscale control subunit; 13121. Switching module; 13122. PWM waveform generator; 132. Data transmission unit; 1321. Receive register; 1322. Clock processor; 1323. Transmit register; 133. Main control unit; 134. Voltage regulator unit; 135. Row selection module; 140. Pin; 200. Controlled LED bead; 300. Main control board. Detailed Implementation

[0065] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0066] Example 1

[0067] See Figure 4 and Figure 5This invention proposes an embodiment of a multi-pixel master-controlled LED bead 100. The multi-pixel master-controlled LED bead 100 is used to construct an LED display screen and includes a bead holder 110, a light-emitting chip 120, a driver chip 130, and pins 140. The light-emitting chip 120, driver chip 130, and pins 140 are disposed on the bead holder 110 and electrically connected to each other. The light-emitting chip 120 may include multiple color channels, such as a red-emitting chip, a green-emitting chip, and a blue-emitting chip. Each color channel may contain one or more light-emitting devices.

[0068] In some embodiments, the lamp bead bracket 110 includes a bracket body, a metal inner frame, a lamp cup, and an inner pad. Pins 140 are exposed outside the bracket body. Electrical wiring is disposed within the bracket body. The light-emitting chip 120 and the driver chip 130 are both connected to the inner pad via micron-sized wires. The lamp cup can be encapsulated with resin or silicone.

[0069] The pins 140 of the multi-pixel master control LED lamp bead 100 include the light-emitting power supply pin VCC, pixel access pins (CRL, CGL, CBL), drive power supply pin VDD, and communication pins (SDI, CLKI, SDO, CLKO).

[0070] The LED power supply pin VCC is connected to the positive power supply terminal of the LED chip 120, providing power to the LED chip 120. An external positive voltage can be applied to the LED chip 120 through the LED power supply pin VCC.

[0071] The pixel access pins (CRL, CGL, CBL) can include multiple color channels for connecting multiple controlled LEDs. These pins can be connected to the negative power supply terminal of the controlled LED. The controlled LEDs are ordinary LEDs without a control chip, and may also include multiple color channels.

[0072] The drive power supply pin VDD is connected to the positive power supply terminal of the driver chip 130 and is used to provide power to the driver chip 130. An external power supply can be connected to the driver chip 130 through the drive power supply pin VDD.

[0073] The communication pins are used to provide communication connections for the driver chip 130, and may include a data input pin SDI, a clock input pin CLKI, a data output pin SDO, and a clock output pin CLKO.

[0074] The driver chip 130 includes a light-emitting control unit 131, a data transmission unit 132, and a main control unit 133.

[0075] The light-emitting control unit 131 is connected to the negative power supply terminal of the light-emitting chip 120 and to the negative power supply terminal of the controlled LED beads through pixel access pins (CRL, CGL, CBL). It is used to control the light-emitting state of the light-emitting chip 120 or the connected controlled LED beads, including brightness and grayscale level of each color channel.

[0076] The data transmission unit 132 can be connected to the data input pin SDI and the clock input pin CLKI to receive control data from upstream devices; the data transmission unit 132 can also be connected to the data output pin SDO and the clock output pin CLKO to send control data to downstream devices.

[0077] The main control unit 133 connects the light-emitting control unit 131 and the data transmission unit 132. It is used to obtain control data for the light-emitting chip 120 and the connected controlled LED beads from the data stream transmitted from the data transmission unit 132, and then control the light-emitting state of the light-emitting chip 120 and the multiple connected controlled LED beads through the light-emitting control unit 131. In some embodiments, the main control unit may include a processing unit, RAM (random access memory), and ROM (read-only memory), etc.

[0078] The multi-pixel master-controlled LED bead of this application embodiment can control the light-emitting state of its own light-emitting chip and the connected controlled LED beads by connecting to multiple controlled LED beads simultaneously. If some of the connected controlled LED beads are damaged, it will not affect the working state and signal control of the remaining controlled LED beads, thus improving the stability of the LED display screen. In addition, this application only requires one multi-pixel master-controlled LED bead to drive multiple ordinary LED beads to form a partial pixel array. Compared with the existing LED display screen control architecture that uses return-to-zero code serial data transmission and address code parallel data transmission, it can greatly reduce the device cost of the LED display screen. Moreover, the multiple multi-pixel master-controlled LED beads of this application can be connected through serial communication to form a larger-scale LED display array, which simplifies the wiring of the LED display screen, makes the structure lightweight, and supports lightweight applications such as transparent displays and UAV-borne displays.

[0079] In some embodiments, the driver chip 130 further includes a voltage regulator unit 134. The power supply input terminal of the voltage regulator unit 134 is connected to an external power supply through a power supply port VDD and a ground port GND, and is used to convert the voltage of the external power supply into a voltage that is compatible with the various components of the driver chip 130, thereby powering the driver chip 130.

[0080] In some embodiments, see Figure 6Taking a color channel light-emitting device connected to the light-emitting chip 120 or a controlled LED bead as an example, the light-emitting control unit 131 includes a brightness control subunit 1311 and / or a grayscale control subunit 1312. The negative power supply terminal of the light-emitting device is electrically connected to the negative terminal of an external power supply through the brightness control subunit 1311 and / or the grayscale control subunit 1312. The brightness control subunit 1311 is used to control the brightness of the light-emitting chip 120 or the connected controlled LED bead, and the grayscale control subunit 1312 is used to control the grayscale level of each color channel of the light-emitting chip 120 or the connected controlled LED bead.

[0081] In some embodiments, the brightness control subunit 1311 includes a constant current source composed of an operational amplifier 13111 and an NMOS transistor 13112. The positive input terminal of the operational amplifier 13111 is connected to a reference voltage, which can be obtained by the main control unit 133 outputting data and passing through the digital-to-analog converter 13113. The negative input terminal of the operational amplifier 13111 is electrically connected to the negative power supply terminal of the light-emitting device, which can obtain the current of the light-emitting device. The output terminal of the operational amplifier 13111 is connected to the gate of the NMOS transistor 13112. The drain of the NMOS transistor 13112 is electrically connected to the negative power supply terminal of the light-emitting device, and the source of the NMOS transistor 13112 is electrically connected to the negative terminal of the external power supply. Thus, the current of the light-emitting device can be stabilized by the operational amplifier 13111 and the NMOS transistor 13112, and the current of the light-emitting device can be adjusted according to the data output by the main control unit 133, thereby adjusting the brightness of the light-emitting device.

[0082] In some implementations, the grayscale control subunit 1312 includes a switching module 13121 and a PWM waveform generator 13122. The switching module 13121 is electrically connected between the negative power supply terminal of the light-emitting device and the negative power supply terminal of the external power supply. The main control unit 133 outputs data to generate a PWM wave with a specified duty cycle through the PWM waveform generator 13122. The PWM wave controls the switching module 13121 to turn on and off, thereby adjusting the grayscale level of each color channel.

[0083] In some embodiments, see Figure 7 The data transmission unit 132 includes a receive register 1321, a clock processor 1322, and a transmit register 1323.

[0084] The receive register 1321 connects to the data input pin SDI, the clock input pin CLKI, and the main control unit 133, and is used to receive data from upstream devices and transmit data to the main control unit 133. In some embodiments, the receive register 1321 may be a shift register, which serially receives data from upstream devices and transmits data to the main control unit 133 in parallel.

[0085] The clock processor 1322 is connected to the clock input pin CLKI, the transmit register 1323, and the clock output pin CLKO. It is used to receive clock signals from upstream devices, shape them, and output them to the transmit register 1323 and the clock output pin CLKO.

[0086] The transmit register 1323 is connected to the main control unit 133 and the data output pin SDO, and is used to output the data to be transmitted to downstream devices to the data output pin SDO. In some embodiments, the transmit register 1323 may be a shift register, which receives parallel data from the main control unit 133 in parallel and transmits data serially to downstream devices.

[0087] In some implementations, the transmitting register 1323 is also connected to the receiving register 1321, and the control data of the non-local multi-pixel master LED beads is directly obtained from the receiving register 1321 and transmitted to the downstream device.

[0088] In some embodiments, see Figure 8 The clock input pins (CLKI1, CLKI2), clock output pins (CLKO1, CLKO2), and clock processor 1322 are all in two sets. Simultaneous transmission of two sets of clock signals can double the clock signal frequency through differential transmission, thereby increasing the data transmission rate.

[0089] Example 2

[0090] See Figure 9 This application provides an embodiment of an LED display module, including a pixel matrix and a main control board 300. Each column of the pixel matrix includes a multi-pixel main control LED 100 according to Embodiment 1 and a plurality of controlled LEDs 200 located at the beginning. The plurality of controlled LEDs 200 are connected to the pixel access pins (CRL, CGL, CBL) of the multi-pixel main control LED 100.

[0091] The first row of the pixel matrix consists of 100 multi-pixel master-controlled LED beads, while the remaining rows of the pixel matrix consist of 200 controlled LED beads.

[0092] The first row scan output port of the main control board 300 is connected to the power supply pin VCC of the multi-pixel main control LED bead 100. The remaining row scan output ports of the main control board are respectively connected to the positive power supply terminals of each row of pixels. The main control board 300 controls the power supply to each row of pixels sequentially. In some embodiments, the main control board 300 may include a main controller and multiple decoders connected to it. The output ports of each channel of the decoder are respectively connected to the row scan output ports of the main control board 300. When the output port of the decoder is high, a positive voltage is provided to the positive power supply terminal of the corresponding row's light-emitting device, that is, the row scan signal of that row of pixels is provided.

[0093] The data port of the main control board 300 is serially connected to the communication pins (SDI, CLKI, SDO, CLKO) of the multi-pixel master-controlled LED beads 100. The main control board 300 can output control signals to multiple serially connected multi-pixel master-controlled LED beads 100.

[0094] As an example, the data communication and control process of an LED display module for each frame of image may include:

[0095] S10, the main control board 300 sends out the first line data signal and clock signal of this frame. At the same time, the first line scan port outputs a positive voltage, while the second to Mth line scan ports do not output a positive voltage.

[0096] S11. In the pixel matrix, the input pin SDI of the first multi-pixel master-controlled LED bead 100 in the first row receives N data signal packets from the main control board 300, and the clock input pin CLKI receives a clock signal. The first multi-pixel master-controlled LED bead 100 controls the light-emitting state of its internal light-emitting chip according to the first data signal packet. The first multi-pixel master-controlled LED bead 100 shapes the remaining N-1 data signal packets and the clock signal, outputs N-1 data signal packets through the data output pin SDO, and outputs the clock signal through the clock output pin CLKO.

[0097] S12. In the pixel matrix, each subsequent multi-pixel master-controlled LED bead 100 in the first row receives the data packet and clock signal sent by the previous multi-pixel master-controlled LED bead 100, extracts the first data signal packet, controls the light-emitting state of its internal light-emitting chip according to the first data signal packet, and then transmits the remaining data signal packets and clock signal to the next multi-pixel master-controlled LED bead 100; until the last multi-pixel master-controlled LED bead 100, at which point the first row of master LEDs displays the first row of the image in this frame;

[0098] S20, the main control board 300 sends the second line data signal and clock signal of this frame. At the same time, the second line scan port outputs a positive voltage, while the other line scan ports do not output a positive voltage.

[0099] S21. In the pixel matrix, the input pin SDI of the first multi-pixel master-controlled LED bead 100 in the first row receives N data signal packets from the main control board 300, and the clock input pin CLKI receives a clock signal. The first multi-pixel master-controlled LED bead 100 controls the lighting state of the connected second row of controlled LED beads according to the first data signal packet. The first multi-pixel master-controlled LED bead 100 shapes the remaining N-1 data signal packets and the clock signal, outputs N-1 data signal packets through the data output pin SDO, and outputs the clock signal through the clock output pin CLKO.

[0100] S22. In the pixel matrix, each of the subsequent multi-pixel master-controlled LED beads 100 in the first row receives the data packets and clock signals sent by the previous multi-pixel master-controlled LED bead 100, extracts the first data signal packet, controls the illumination state of the second row of controlled LED beads connected to it according to the first data signal packet, and then transmits the remaining data signal packets and clock signals to the next multi-pixel master-controlled LED bead 100; until the last multi-pixel master-controlled LED bead 100, at which point the second row of sub-LEDs displays the second row image of this frame;

[0101] S30, and so on, until the Mth row of the first frame displays the Mth row of the image in this frame.

[0102] Example 3

[0103] See Figure 10 This application provides an embodiment of a multi-pixel master-controlled LED bead 100', which differs from Embodiment 1 in that: the pixel access pins include pixel access pins for the same column (CRL, CGL, CBL) and pixel access pins for other columns (RLED2, GLED2, BLED2). Both the pixel access pins for the same column (CRL, CGL, CBL) and the pixel access pins for other columns (RLED2, GLED2, BLED2) can include multiple color channels. The pixel access pins for other columns can include multiple groups (xLED2, ..., xLEDN).

[0104] The pixel access pins (CRL, CGL, CBL) in this column are used to connect to the negative power supply terminals of multiple controlled LEDs in the same column as the multi-pixel master LED 100'. The pixel access pins (RLED2, GLED2, BLED2) in other columns are used to connect to the negative power supply terminals of multiple controlled LEDs in different columns from the multi-pixel master LED 100'.

[0105] In this embodiment, the multi-pixel master control LED bead 100' can control the light emission state of the controlled LED beads in the same column as it, and can also control the light emission state of the controlled LED beads in different columns.

[0106] This embodiment can further reduce the number of multi-pixel master control LED beads in the LED display screen, eliminating the need to use a multi-pixel master control LED bead for each column of pixels, thereby further reducing the device cost of the LED display screen.

[0107] Example 4

[0108] See Figure 11This application proposes an embodiment of an LED display module, including a pixel matrix and a main control board 300'. The pixel matrix includes multiple sub-matrices. The first pixel of the first column of the sub-matrices is a multi-pixel main control LED bead 100' as described in Embodiment 3. The remaining pixels of the first column of the sub-matrices are controlled LED beads 200' connected to the pixel access pins (CRL, CGL, CBL) of the same column of the multi-pixel main control LED bead 100'. The remaining pixels of the sub-matrices are controlled LED beads 200' connected to the pixel access pins (RLED2, GLED2, BLED2) of other columns of the multi-pixel main control LED bead 100'.

[0109] The first row of pixels in the pixel matrix includes multi-pixel master LED beads 100' and controlled LED beads 200', and the remaining rows of pixels in the pixel matrix are controlled LED beads 200'.

[0110] The first row scan output port of the main control board 300' is connected to the power supply pin VCC of the multi-pixel master LED beads 100' in multiple sub-matrices, and the positive power supply terminal of the controlled LED beads 200' in the first row of pixels. The remaining row scan output ports of the main control board 300' are respectively connected to the positive power supply terminals of the remaining rows of pixels. The main control board 300' controls the power supply to each row of pixels row by row. In some embodiments, the main control board 300' may include a master controller and multiple decoders connected to it. The output ports of each channel of the decoder are respectively connected to the row scan output ports of the main control board 300'. When the output port of the decoder is high, a positive voltage is provided to the positive power supply terminal of the light-emitting device in the corresponding row, that is, the row scan signal of the pixel in that row is provided.

[0111] The data port of the main control board 300' is serially connected to the communication pins SDI, CLKI, SDO, and CLKO of the multi-pixel main control LED beads 100'.

[0112] The difference between the data communication and control process of the LED display module in this embodiment and that in Embodiment 2 is that the data signal packet received by the multi-pixel master LED 100' includes control signals for the light-emitting state of its own light-emitting chip or the controlled LED 200' in the same column, as well as control signals for the light-emitting state of controlled LED 200' in a different column within the same sub-matrix. After the row scan signal is issued, the multi-pixel master LED 100' also controls the light-emitting state of the controlled LED 200' connected to the pixel access pins (RLED2, GLED2, BLED2) in other columns.

[0113] Example 5

[0114] See Figure 12 This application provides an embodiment of a multi-pixel master-controlled LED lamp bead 100", which differs from embodiment three in that:

[0115] The pins also include a first row pixel power supply pin V1 and other rows pixel power supply pins (V2, ..., VM). The first row pixel power supply pin V1 is used to provide power to multiple controlled LEDs that are connected in the same row as the multi-pixel main control LED 100". The other rows pixel power supply pins (V2, ..., VM) are used to provide power to multiple controlled LEDs that are connected in a different row from the multi-pixel main control LED 100".

[0116] The driver chip 130 also includes a row selection module 135, which is connected to the main control unit 133, the light-emitting power supply pin VCC, the first row pixel power supply pin V1, and the remaining row pixel power supply pins (V2, ..., VM). According to the control of the main control unit 133, the light-emitting power supply pin VCC is connected to a selected pin among the first row pixel power supply pin V1 and the remaining row pixel power supply pins (V2, ..., VM), thereby providing power input to the controlled LED beads in the row where the selected pin is located, and realizing part of the row scanning function.

[0117] This embodiment also integrates some line scanning functions into the multi-pixel main control LED beads, which can further simplify the settings of other control modules of the LED display screen and reduce wiring complexity.

[0118] Example 6

[0119] See Figure 13 This application proposes an embodiment of an LED display module, including a pixel matrix and a main control board 300". The pixel matrix includes multiple sub-matrices. The first pixel of the first column of the sub-matrix is ​​a multi-pixel main control LED bead 100" as described in Embodiment 5. The remaining pixels of the first column of the sub-matrix are controlled LED beads 200" connected to the pixel access pins (CRL, CGL, CBL) of the same column of the multi-pixel main control LED bead 100". The remaining columns of the sub-matrix are controlled LED beads 200" connected to the pixel access pins (xLED2, xLED3, ..., xLEDN) of other columns of the multi-pixel main control LED bead 100".

[0120] The first row of pixels in the pixel matrix includes multi-pixel master LED beads 100" and controlled LED beads 200", and the remaining rows of pixels in the pixel matrix are controlled LED beads 200".

[0121] The 300" row scan power supply port of the main control board is connected to the light-emitting power supply pin VCC of the multi-pixel main control LED beads 100" in multiple sub-matrixes. The first row pixel power supply pin V1 of the multi-pixel main control LED beads 100" is connected to the positive power supply terminal of the controlled LED beads 200" in the first row of the same sub-matrix.

[0122] The power supply pins V2, ..., VM of the remaining rows of pixels in the multi-pixel master control LED lamp bead 100" are respectively connected to the positive power supply terminals of the remaining rows of pixels in the same sub-matrix. The driver chip of the multi-pixel master control LED lamp bead 100" controls the power supply to each row of pixels in the same sub-matrix row by row.

[0123] The 300" data port of the main control board is serially connected to the communication pins SDI, CLKI, SDO, and CLKO of the 100" multi-pixel main control LED beads.

[0124] The difference between the data communication and control process of the LED display module in this embodiment and that in embodiment four is that the row scan power supply port of the main control board 300” can provide a positive voltage to the controlled LED beads 200” connected to the multi-pixel main control LED beads 100” in the sub-matrix. The data signal packet received by the multi-pixel main control LED beads 100” also includes a row scan signal. The multi-pixel main control LED beads 100” controls the row selection module 135 to provide a row scan signal to the controlled LED beads 200” in the same sub-matrix.

[0125] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art and should not be interpreted in an idealized or overly formal sense unless specifically defined.

[0126] It should be noted that certain terms are used in this specification to refer to specific components. Those skilled in the art will understand that different manufacturers and producers may use different terms to refer to the same component. This specification does not distinguish components based on differences in terminology, but rather on differences in their functions.

[0127] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0128] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features included in other embodiments but not others, combinations of features from different embodiments are meant to be within the scope of the invention and form different embodiments.

[0129] Those skilled in the art will understand that modules in the device of the embodiments can be adaptively changed and placed in one or more devices different from that embodiment. Modules, units, or components in the embodiments can be combined into a single module, unit, or component, and further, they can be divided into multiple sub-modules, sub-units, or sub-components. Except where at least some of such features and / or processes or units are mutually exclusive, any combination can be used to combine all features disclosed herein and all processes or units of any method or device so disclosed. Unless expressly stated otherwise, each feature disclosed herein may be replaced by an alternative feature that serves the same, equivalent, or similar purpose.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-pixel master LED lamp bead for constituting an LED display screen, characterized in that, The LED lamp bead driving chip comprises a lamp bead support, a light emitting chip, a driving chip and a pin which are arranged on the lamp bead support and are electrically connected with each other. The pin comprises: a light emitting power supply pin for providing power supply access for the light emitting chip; a pixel access pin for accessing a plurality of controlled LED lamp beads; a driving power supply pin for providing power supply access for the driving chip; and a communication pin for providing communication connection for the driving chip; The driving chip comprises: a light emitting control unit connected with the light emitting chip and the pixel access pin, for controlling the light emitting state of the light emitting chip or the accessed controlled LED lamp beads; a data transmission unit connected with the communication pin, for receiving control data from an upstream device and sending control data to a downstream device; and a master control unit connected with the light emitting control unit and the data transmission unit, for obtaining control data of the light emitting chip and the accessed controlled LED lamp beads from a data stream transmitted from the data transmission unit, and controlling the light emitting state of the light emitting chip and the plurality of accessed controlled LED lamp beads through the light emitting control unit. The light emitting control unit comprises a brightness control subunit and / or a gray scale control subunit, a negative power supply end of the light emitting chip or the controlled LED lamp bead is electrically connected with a negative power supply end of an external power supply through the brightness control subunit and / or the gray scale control subunit; the brightness control subunit is used for controlling the brightness of the light emitting chip or the accessed controlled LED lamp beads, and the gray scale control subunit is used for controlling the gray scale of each color channel of the light emitting chip or the accessed controlled LED lamp beads.

2. The multi-pixel master LED lamp bead according to claim 1, characterized in that, The driving chip further comprises a voltage stabilizing unit, a power supply input end of the voltage stabilizing unit is connected with an external power supply through a power supply port and a grounding port, and the voltage stabilizing unit is used for supplying power for the driving chip.

3. The multi-pixel master LED lamp bead according to claim 1, characterized in that, The communication pin comprises a data input pin, a clock input pin, a data output pin and a clock output pin; The data transmission unit comprises a receiving register, a clock processor and a sending register; The receiving register is connected with the data input pin, the clock input pin and the master control unit, and is used for receiving data from an upstream device and transmitting the data to the master control unit; The clock processor is connected with the clock input pin, the sending register and the clock output pin, and is used for receiving a clock signal from an upstream device, shaping the clock signal and then outputting the shaped clock signal to the sending register and the clock output pin; and The sending register is connected with the master control unit and the data output pin, and is used for outputting data to be transmitted to a downstream device to the data output pin.

4. The multi-pixel master LED lamp bead according to claim 3, characterized in that, The clock input pin, the clock output pin and the clock processor are both in two groups.

5. The multi-pixel master LED lamp bead according to any one of claims 1 to 4, characterized in that, The pixel access pin comprises: a same column pixel access pin for accessing a plurality of controlled LED lamp beads in the same column as a plurality of pixel master LED lamp beads; and a different column pixel access pin for accessing a plurality of controlled LED lamp beads in different columns from the plurality of pixel master LED lamp beads.

6. The multi-pixel master LED lamp bead according to claim 5, characterized in that, The pin further comprises: a first row pixel power supply pin for providing power supply access for a plurality of controlled LED lamp beads in the same row as the plurality of pixel master LED lamp beads. a rest row pixel power supply pin for providing power supply access for a plurality of controlled LED lamp beads of different rows from the plurality of pixel master control LED lamp beads accessed; The driving chip further comprises: a row selection module connected to the master control unit, the light power supply pin, the first row pixel power supply pin and the rest row pixel power supply pin, for making the light power supply pin communicate with a selected pin including the first row pixel power supply pin and the rest row pixel power supply pin according to the control of the master control unit.

7. An LED display module, comprising a pixel matrix and a master control board, characterized in that, The column pixels of the pixel matrix each comprise a plurality of pixel master control LED lamp beads according to any one of claims 1 to 4 at the head, and a plurality of controlled LED lamp beads connected to the pixel access pins of the pixel master control LED lamp beads; The first row pixels of the pixel matrix each are the pixel master control LED lamp beads, and the rest row pixels of the pixel matrix each are controlled LED lamp beads; The first row row scan output port of the master control board is connected to the light power supply pin of the pixel master control LED lamp bead, the rest row scan output ports of the master control board are respectively connected to the power supply positive terminals of the pixels of the rest rows, and the master control board controls power supply to the pixels of the rows row by row. The data port of the master control board is serially connected to the communication pin of the pixel master control LED lamp bead.

8. An LED display module, comprising a pixel matrix and a master control board, characterized in that, The pixel matrix comprises a plurality of sub-matrices, the head pixel of the first column pixels of the sub-matrices is a pixel master control LED lamp bead according to claim 5, the rest pixels of the first column pixels of the sub-matrices are controlled LED lamp beads connected to the current column pixel access pins of the pixel master control LED lamp bead, and the rest column pixels of the sub-matrices are controlled LED lamp beads connected to the other column pixel access pins of the pixel master control LED lamp bead. The first row pixels of the pixel matrix each comprise the pixel master control LED lamp bead and the controlled LED lamp bead, and the rest row pixels of the pixel matrix each are controlled LED lamp beads; The first row row scan output port of the master control board is connected to the light power supply pin of the pixel master control LED lamp bead, the rest row scan output ports of the master control board are respectively connected to the power supply positive terminals of the pixels of the rest rows, and the master control board controls power supply to the pixels of the rows row by row. The data port of the master control board is serially connected to the communication pin of the pixel master control LED lamp bead.

9. An LED display module, comprising a pixel matrix and a master control board, characterized in that, The pixel matrix comprises a plurality of sub-matrices, the head pixel of the first column pixels of the sub-matrices is a pixel master control LED lamp bead according to claim 6, the rest pixels of the first column pixels of the sub-matrices are controlled LED lamp beads connected to the current column pixel access pins of the pixel master control LED lamp bead, and the rest column pixels of the sub-matrices are controlled LED lamp beads connected to the other column pixel access pins of the pixel master control LED lamp bead. The first row pixels of the pixel matrix each comprise the pixel master control LED lamp bead and the controlled LED lamp bead, and the rest row pixels of the pixel matrix each are controlled LED lamp beads; The row scanning power supply port of the master control board is connected with the light-emitting power supply pins of the multi-pixel master control LED lamp beads in the plurality of sub-matrices, the first row of pixel power supply pins of the multi-pixel master control LED lamp beads are connected with the power supply positive terminals of the controlled LED lamp beads in the first row of pixels in the same sub-matrix; The remaining row of pixel power supply pins of the multi-pixel master control LED lamp beads are respectively connected with the power supply positive terminals of the remaining row of pixels in the same sub-matrix, and the driving chip of the multi-pixel master control LED lamp beads controls the power supply of each row of pixels in the same sub-matrix in turn; The data port of the master control board is serially connected with the communication pins of the multi-pixel master control LED lamp beads.

Images