Multi-pixel master control LED lamp bead and LED display module

Abstract

The invention discloses a multi-pixel master control LED lamp bead and an LED display module. The multi-pixel master control LED lamp bead comprises a lamp bead support, a light-emitting chip, a driving chip and pins. The driving chip comprises a light-emitting control unit used for controlling the light-emitting state of the light-emitting chip or the connected controlled LED lamp bead, and a data transmission unit used for receiving control data from upstream equipment and sending the control data to downstream equipment. And the state master control unit is used for acquiring control data of the light-emitting chip and the accessed controlled LED lamp beads from the data stream transmitted by the data transmission unit, and controlling the light-emitting states of the light-emitting chip and the plurality of accessed controlled LED lamp beads through the light-emitting control unit. The multi-pixel master control LED lamp bead drives a group of common controlled LED lamp beads to complete display control, the stability of the LED display screen is improved, meanwhile, the device cost is reduced, and the LED display screen has the advantages of being simple in wiring, light and handy in structure and high in refresh rate.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optoelectronic semiconductor devices, in particular to an LED display device and an LED display module. BACKGROUND

[0002] In the occasions of intelligent light control, photoelectric glass, intelligent display screen, etc., light adjustment, color control, image display are usually realized by means of a series of LED lamp bead arrays. According to the display requirements of different application occasions, multi-color light emission, color display, water flow, galloping, alternating flashing and other display effects can be realized, such as light display effects in various application occasions such as bee swarm unmanned plane indication decoration, balance car decoration, children's shoe decoration, outdoor brightening engineering lamp, landscape lighting lamp, stage atmosphere rendering lamp, etc. In the specific implementation process, the color channel gray scale combination, brightness and other parameters of each LED lamp bead are controlled by the main control chip according to the control program to issue instruction signals. In order to ensure the accuracy of the display effect, a control IC is usually embedded in each LED lamp bead to realize programmable, independent address control, single-point control, multi-point continuous transmission, point-by-point scanning and other functions, so as to accurately control the execution action parameters of each LED lamp bead.

[0003] In the prior art, the LED display screen control architecture realized by means of zero return code serial transmission data is as shown in Figure 1 The main control board outputs M groups of control signals to control M rows of pixel display. For the pixels in each row, N LED lamp beads are connected in parallel between the positive electrode and the negative electrode of the power supply. The control signal is output from the main control board to the signal input end DIN of the first LED lamp bead, and thereafter the signal input end DIN of the LED lamp bead is connected to the signal output end DOUT of the previous LED lamp bead. The main control board outputs N control signals for each row of pixels. After each LED lamp bead receives its own control signal, it transmits the remaining control signals to the next LED lamp bead. The disadvantages of this method are: (1) when a certain lamp bead is damaged, the subsequent signal transmission will be terminated, causing all subsequent lamp beads to be unable to receive control signals and thus unable to be lit; (2) the signal transmission frequency of this method is only about 800Khz, which cannot produce a high refresh rate display screen. The high-speed control system needs to accommodate the low-speed lamp beads, resulting in a low load capacity of a single control card, causing cost increase; (3) each LED lamp bead is a lamp driver in one, resulting in high cost of producing a display screen.

[0004] In the prior art, the LED display screen control architecture realized by means of address code parallel transmission data is as shown in Figure 2As shown. The main control board outputs M groups of control signals to control M rows of pixel display. For the pixels in each row, N LED lamp beads are connected in parallel between the positive and negative power supply, and the signal input end DIN of each LED lamp bead is connected in parallel on a signal input line. The main control board inputs N control signals to each row of pixels, each control signal including display data and address information. The address information of each lamp bead is fixedly set as an address code when the lamp bead chip is manufactured. Parallel transmission of data with address code can avoid the situation that damage to one lamp bead causes all subsequent lamp beads to be unable to receive control signals. However, this method still has the following disadvantages: (1) Since there are usually 64 common address formats in the industry, the same specification of lamp beads will have 64 different address formats, leading to the phenomenon that the same specification of lamp beads with different address formats are mixed, making subsequent processing difficult, and requiring matching of lamp beads with the corresponding address format for replacement during maintenance; (2) When the number of lamp beads in series in the same pixel exceeds 64, the second 64 lamp beads need to be provided with a second signal supply port on the main board. In straight-line transmission, the control signal from the second signal supply port needs to bypass the first 64 lamp beads and be connected from the 65th lamp bead. If there are a third 64 lamp beads, a third signal supply port needs to be added on the main board, and the control signal from the third signal supply port needs to bypass the first and second 64 lamp beads and be connected from the 129th lamp bead; and so on. This results in increased wiring space, a large number of wires, and a wider circuit board, affecting the layout and use effect of the dimming glass, smart display screen, and especially transparent display screen; (3) Address codes need to be transmitted in control communication, which is complicated and slow, and the cost of the display screen is high.

[0005] In the prior art, the control architecture of the LED display screen with lamp drive separation is as shown. Figure 3 The pixels of the LED display screen are all ordinary LED lamp beads. The main control board sends power signals to the ordinary LED lamp beads row by row through the decoder chip, so that the ordinary LED lamp beads are powered row by row, and then the LED display screen drive chip controls the light-emitting state of the column pixels. Although the pixels of the LED display screen in this way are all ordinary LED lamp beads, multiple decoder chips and LED display screen drive chips are needed to complete the display control, which increases the cost of devices and also requires additional power supply, communication, chip selection, and latch signal lines, making the overall display screen wiring complex, the peripheral devices numerous, the overall structure bulky, the refresh rate low, and it is difficult to support lightweight applications such as transparent display screens and unmanned aerial display screens. SUMMARY

[0006] The present application aims to overcome the problems of unstable signal, high cost, low refresh rate, complex wiring and bulky structure of the prior art LED display screen, and provides a multi-pixel master control LED lamp bead and an LED display module.

[0007] The present application provides the following solutions: According to the first aspect, the present application provides a multi-pixel master control LED lamp bead for forming an LED display screen, comprising a lamp bead support, a light emitting chip, a driving chip and a pin arranged on the lamp bead support and electrically connected with each other. The pin comprises: a light emitting power supply pin for providing power 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 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 bead; 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 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.

[0008] In some embodiments, the driving chip further comprises a voltage stabilizing unit, a power supply input end of the voltage stabilizing unit being connected with an external power supply through a power supply port and a grounding port, for supplying power to the driving chip.

[0009] In some embodiments, 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 being electrically connected with a negative 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 bead, 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 bead.

[0010] In some embodiments, the communication pins include a data input pin, a clock input pin, a data output pin and a clock output pin; The data transmission unit includes a receiving register, a clock processor and a sending register; The receiving register is connected to the data input pin, the clock input pin and the master control unit, for receiving data from an upstream device and transmitting the data to the master control unit; The clock processor is connected to the clock input pin, the sending register and the clock output pin, for receiving a clock signal from the upstream device, shaping the clock signal and outputting the shaped clock signal to the sending register and the clock output pin; and The sending register is connected to the master control unit and the data output pin, for outputting data to be transmitted to a downstream device to the data output pin.

[0011] In some embodiments, the clock input pin, the clock output pin and the clock processor are two groups.

[0012] According to a second aspect, the present application provides a multi-pixel master control LED lamp bead, based on the multi-pixel master control LED lamp bead of the first aspect, the pixel access pin includes: a same-column pixel access pin for accessing a plurality of controlled LED lamp beads in the same column as the multi-pixel master control LED lamp bead; and a different-column pixel access pin for accessing a plurality of controlled LED lamp beads in a different column from the multi-pixel master control LED lamp bead.

[0013] According to a third aspect, the present application provides a multi-pixel master control LED lamp bead, based on the multi-pixel master control LED lamp bead of the second aspect, the pin further includes: a first-row pixel power supply pin for providing power access for a plurality of controlled LED lamp beads in the same row as the multi-pixel master control LED lamp bead; a remaining-row pixel power supply pin for providing power access for a plurality of controlled LED lamp beads in a different row from the multi-pixel master control LED lamp bead; The driving chip further includes: a row selection module connected to the master control unit, the light-emitting power supply pin, the first-row pixel power supply pin and the remaining-row pixel power supply pin, for making the light-emitting power supply pin communicate with a selected pin including the first-row pixel power supply pin and the remaining-row pixel power supply pin according to the control of the master control unit.

[0014] According to a fourth aspect, the present application provides an LED display module, comprising a pixel matrix and a main control board, each column pixel of the pixel matrix comprises a plurality of pixel main control LED lamp beads according to the first aspect, and a plurality of controlled LED lamp beads connected to the pixel access pins of the plurality of pixel main control LED lamp beads; The first row of pixels of the pixel matrix are the plurality of pixel main control LED lamp beads, and the remaining row of pixels of the pixel matrix are controlled LED lamp beads; The first row of row scan output ports of the main control board are connected to the light-emitting power supply pins of the plurality of pixel main control LED lamp beads, and the remaining row scan output ports of the main control board are respectively connected to the power supply positive terminals of each row of pixels, and the main control board controls the power supply of each row of pixels row by row; The data port of the main control board is serially connected to the communication pins of the plurality of pixel main control LED lamp beads.

[0015] According to a fifth aspect, the present application provides an LED display module, comprising a pixel matrix and a main control board, the pixel matrix comprises a plurality of sub-matrices, the first pixel of the first column of pixels of the sub-matrix is a plurality of pixel main control LED lamp beads according to the second aspect, the remaining pixels of the first column of pixels of the sub-matrix are controlled LED lamp beads connected to the column pixel access pins of the plurality of pixel main control LED lamp beads, and the remaining column pixels of the sub-matrix are controlled LED lamp beads connected to the other column pixel access pins of the plurality of pixel main control LED lamp beads; The first row of pixels of the pixel matrix comprises the plurality of pixel main control LED lamp beads and controlled LED lamp beads, and the remaining row of pixels of the pixel matrix are controlled LED lamp beads; The first row of row scan output ports of the main control board are connected to the light-emitting power supply pins of the plurality of pixel main control LED lamp beads in the plurality of sub-matrices and the power supply positive terminals of the controlled LED lamp beads in the first row of pixels, and the remaining row scan output ports of the main control board are respectively connected to the power supply positive terminals of the remaining each row of pixels, and the main control board controls the power supply of each row of pixels row by row; The data port of the main control board is serially connected to the communication pins of the plurality of pixel main control LED lamp beads.

[0016] According to a sixth aspect, the present application provides an LED display module, comprising a pixel matrix and a main control board, the pixel matrix comprises a plurality of sub-matrices, the first pixel of the first column of pixels of the sub-matrix is a plurality of pixel main control LED lamp beads according to the third aspect, the remaining pixels of the first column of pixels of the sub-matrix are controlled LED lamp beads connected to the column pixel access pins of the plurality of pixel main control LED lamp beads, and the remaining column pixels of the sub-matrix are controlled LED lamp beads connected to the other column pixel access pins of the plurality of pixel main control LED lamp beads; The first row of pixels of the pixel matrix comprises the multi-pixel master LED lamp bead and the controlled LED lamp bead, and the remaining rows of pixels of the pixel matrix are controlled LED lamp beads; The row scanning power supply port of the master control board is connected to the light emitting power supply pin of the multi-pixel master LED lamp bead in the plurality of sub-matrices, and the first row of pixel power supply pins of the multi-pixel master LED lamp bead are connected to 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 LED lamp bead are respectively connected to the power supply positive terminals of the remaining rows of pixels in the same sub-matrix, and the driving chip of the multi-pixel master LED lamp bead controls the power supply of each row of pixels in the same sub-matrix row by row. The data port of the master control board is serially connected to the communication pin of the multi-pixel master LED lamp bead.

[0017] Compared with the prior art, the present application has the following advantages: The multi-pixel master LED lamp bead and the LED display module provided by the embodiment of the present application can control the light emitting state of the light emitting chip itself and the connected controlled LED lamp beads by being connected to a plurality of controlled LED lamp beads at the same time. If part of the connected controlled LED lamp beads is damaged, it will not affect the working state and signal control of the remaining controlled LED lamp beads, thereby improving the stability of the LED display screen. In addition, only one multi-pixel master LED lamp bead is needed to drive a plurality of ordinary LED lamp beads to form a partial pixel array. Compared with the LED display screen control architecture realized by the prior art zero return code serial data transmission and address code parallel data transmission, the device cost of the LED display screen can be greatly reduced. Moreover, a plurality of multi-pixel master LED lamp beads of the present application can be connected through serial communication to form a larger scale LED display array, so that the wiring of the LED display screen is simplified, the structure is light and compact, and the LED display screen can support lightweight applications such as transparent display screen, unmanned aerial display screen, etc. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0019] Figure 1 is a schematic diagram of the LED display screen control architecture realized by the prior art zero return code serial data transmission method; Figure 2 is a schematic diagram of the LED display screen control architecture realized by the prior art address code parallel data transmission method; Figure 3 is a schematic diagram of a prior art lamp and driver separated LED display screen control architecture; Figure 4 is a schematic diagram of an embodiment structure of a multi-pixel master control LED lamp bead of the present application; Figure 5 is a schematic diagram of an embodiment electrical structure of a multi-pixel master control LED lamp bead of the present application; Figure 6 is a schematic diagram of an embodiment light emitting control unit electrical structure of the present application; Figure 7 is a schematic diagram of an embodiment data transmission unit electrical structure of the present application; Figure 8 is a schematic diagram of an embodiment data transmission unit electrical structure of the present application; Figure 9 is a schematic diagram of an embodiment structure of an LED display module of the present application; Figure 10 is a schematic diagram of an embodiment structure of a multi-pixel master control LED lamp bead of the present application; Figure 11 is a schematic diagram of an embodiment structure of an LED display module of the present application; Figure 12 is a schematic diagram of an embodiment structure of a multi-pixel master control LED lamp bead of the present application; Figure 13 is a schematic diagram of an embodiment structure of an LED display module of the present application.

[0020] In the drawings: 100, multi-pixel master control LED lamp bead; 110, lamp bead support; 120, light emitting chip; 130, drive chip; 131, light emitting control unit; 1311, brightness control subunit; 13111, operational amplifier; 13112, NMOS tube; 13113, digital-to-analog converter; 1312, gray scale control subunit; 13121, switch module; 13122, PWM waveform generator; 132, data transmission unit; 1321, receiving register; 1322, clock processor; 1323, sending register; 133, master control unit; 134, voltage stabilizing unit; 135, row selection module; 140, pin; 200, controlled LED lamp bead; 300, master control board. DETAILED DESCRIPTION

[0021] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0022] Embodiment one Referring to Figure 4 and Figure 5 , the present application proposes a multi-pixel master LED lamp bead 100 embodiment. The multi-pixel master LED lamp bead 100 is used to constitute an LED display screen, comprising a lamp bead support 110, a light emitting chip 120, a driving chip 130 and a pin 140. The light emitting chip 120, the driving chip 130 and the pin 140 are arranged in the lamp bead support 110 and are electrically connected with each other. The light emitting chip 120 can include multiple color channels, such as red light emitting chips, green light emitting chips and blue light emitting chips, etc. Each color channel can include one or more light emitting devices.

[0023] In some embodiments, the lamp bead support 110 includes a support body, a metal inner support, a lamp cup and a cup inner pad, the pin 140 is exposed to the support body, an electrical circuit is arranged in the support body, the light emitting chip 120 and the driving chip 130 are connected to the cup inner pad through micron wires. The sealing glue of the lamp cup can be resin or silicone.

[0024] The pin 140 of the multi-pixel master LED lamp bead 100 includes a light emitting power supply pin VCC, a pixel access pin (CRL, CGL, CBL), a driving power supply pin VDD and a communication pin (SDI, CLKI, SDO, CLKO).

[0025] The light emitting power supply pin VCC is connected to the power supply positive end of the light emitting chip 120, and is used to provide power access for the light emitting chip 120. An external forward voltage can be accessed from the light emitting power supply pin VCC to the light emitting chip 120.

[0026] The pixel access pin (CRL, CGL, CBL) can include multiple color channels, and is used to access multiple controlled LED lamp beads. The pixel access pin (CRL, CGL, CBL) can be connected to the power supply negative end of the controlled LED lamp bead. The controlled LED lamp bead is a common LED lamp bead without a control chip, and the controlled LED lamp bead can also include multiple color channels.

[0027] The driving power supply pin VDD is connected to the power supply positive end of the driving chip 130, and is used to provide power access for the driving chip 130. An external power supply can be accessed from the driving power supply pin VDD to the driving chip 130.

[0028] The communication pin is used to provide communication connection for the driving chip 130, and can include a data input pin SDI, a clock input pin CLKI, a data output pin SDO and a clock output pin CLKO.

[0029] The driving chip 130 includes a light emitting control unit 131, a data transmission unit 132 and a master control unit 133.

[0030] The light emitting control unit 131 is connected to the power supply negative terminal of the light emitting chip 120, and is connected to the power supply negative terminal of the controlled LED lamp bead through the pixel access pins (CRL, CGL, CBL) for controlling the light emitting state of the light emitting chip 120 or the accessed controlled LED lamp bead, including brightness and gray scale of each color channel.

[0031] The data transmission unit 132 is connected to the data input pin SDI and the clock input pin CLKI to receive control data from the upstream device, and is also connected to the data output pin SDO and the clock output pin CLKO to send control data to the downstream device.

[0032] The master control unit 133 is connected to the light emitting control unit 131 and the data transmission unit 132, and is used to obtain the control data of the light emitting chip 120 and the accessed controlled LED lamp bead from the data stream transmitted by the data transmission unit 132, and control the light emitting state of the light emitting chip 120 and the accessed controlled LED lamp bead through the light emitting control unit 131. In some embodiments, the master control unit can include an arithmetic processor, a RAM (random access memory) and a ROM (read only memory), etc.

[0033] The multi-pixel master control LED lamp bead of the embodiments of the present application can control the light emitting state of the light emitting chip itself and the connected controlled LED lamp bead by being connected to multiple controlled LED lamp beads at the same time. If part of the connected controlled LED lamp beads is damaged, it will not affect the working state and signal control of the remaining controlled LED lamp beads, thereby improving the stability of the LED display screen. In addition, only one multi-pixel master control LED lamp bead is needed to drive multiple ordinary LED lamp beads to form a partial pixel array. Compared with the LED display screen control architecture of the prior art which realizes data transmission by zero code in series and data transmission by address code in parallel, the device cost of the LED display screen can be greatly reduced. Moreover, multiple multi-pixel master control LED lamp beads of the present application can be connected in series to form a larger scale LED display array, so that the wiring of the LED display screen is simplified, the structure is light and compact, and the LED display screen can support lightweight applications such as transparent display screen, unmanned aerial display screen, etc.

[0034] In some embodiments, the driving chip 130 further includes a voltage stabilizing unit 134, and the power supply input end of the voltage stabilizing unit 134 is connected to an external power supply through the power supply port VDD and the grounding port GND for converting the voltage of the external power supply into a voltage suitable for the components of the driving chip 130, thereby supplying power to the driving chip 130.

[0035] In some embodiments, referring to Figure 6For example, taking the light-emitting chip 120 or one color channel of the controlled LED lamp bead as an example, the light-emitting control unit 131 includes a brightness control subunit 1311 and / or a gray scale control subunit 1312, and the negative power supply terminal of the light-emitting device is electrically connected to the negative power supply terminal of the external power supply through the brightness control subunit 1311 and / or the gray scale 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 lamp bead, and the gray scale control subunit 1312 is used to control the gray scale of each color channel of the light-emitting chip 120 or the connected controlled LED lamp bead.

[0036] In some embodiments, the brightness control subunit 1311 includes a constant current source composed of an operational amplifier 13111 and an NMOS tube 13112. The positive input terminal of the operational amplifier 13111 is connected to a reference voltage, which can be obtained by outputting data from the master control unit 133 and through a 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, and the current of the light-emitting device can be obtained. The output terminal of the operational amplifier 13111 is connected to the gate of the NMOS tube 13112. The drain of the NMOS tube 13112 is electrically connected to the negative power supply terminal of the light-emitting device, and the source of the NMOS tube 13112 is electrically connected to the negative power supply terminal of the external power supply. Thus, the current of the light-emitting device can be stabilized through the operational amplifier 13111 and the NMOS tube 13112, and the brightness of the light-emitting device can be adjusted according to the data output from the master control unit 133.

[0037] In some embodiments, the gray scale control subunit 1312 includes a switch module 13121 and a PWM waveform generator 13122. The switch 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 data output from the master control unit 133 is used to generate a PWM wave with a specified duty cycle through the PWM waveform generator 13122. The switch module 13121 is controlled to be turned on and turned off through the PWM wave, thereby adjusting the gray scale of each color channel.

[0038] In some embodiments, referring to Figure 7 , the data transmission unit 132 includes a receiving register 1321, a clock processor 1322, and a sending register 1323.

[0039] The receiving register 1321 is connected to the data input pin SDI, the clock input pin CLKI, and the master control unit 133, and is used to receive data from the upstream device and transmit the data to the master control unit 133. In some embodiments, the receiving register 1321 can be a shift register, which receives data from the upstream device in series and transmits the data to the master control unit 133 in parallel.

[0040] The clock processor 1322 is connected to the clock input pin CLKI, the transmitting register 1323 and the clock output pin CLKO, for receiving the clock signal from the upstream device, shaping the clock signal and outputting the shaped clock signal to the transmitting register 1323 and the clock output pin CLKO.

[0041] The transmitting register 1323 is connected to the master unit 133 and the data output pin SDO, for outputting the data to be transmitted to the downstream device to the data output pin SDO. In some embodiments, the transmitting register 1323 can be a shift register, receiving the parallel data from the master unit 133 in parallel and transmitting the data to the downstream device in series.

[0042] In some embodiments, the transmitting register 1323 is also connected to the receiving register 1321, directly obtaining the control data of the non-multiple-pixel master LED lamp bead from the receiving register 1321 and transmitting the control data to the downstream device.

[0043] In some embodiments, referring to Figure 8 , the clock input pin (CLKI1, CLKI2), the clock output pin (CLKO1, CLKO2) and the clock processor 1322 are two groups. Transmitting two groups of clock signals at the same time can double the frequency of the clock signal in a differential manner, improving the data transmission rate.

[0044] Embodiment two Referring to Figure 9 , the present application provides an LED display module embodiment, comprising a pixel matrix and a master board 300, and each column pixel of the pixel matrix comprises a multiple-pixel master LED lamp bead 100 according to embodiment one at the beginning and a plurality of controlled LED lamp beads 200, and the plurality of controlled LED lamp beads 200 are connected to the pixel access pins (CRL, CGL, CBL) of the multiple-pixel master LED lamp bead 100.

[0045] The first row of pixels of the pixel matrix are all multiple-pixel master LED lamp beads 100, and the remaining rows of pixels of the pixel matrix are all controlled LED lamp beads 200.

[0046] The first row of row scan output ports of the master board 300 are connected to the light-emitting power supply pins VCC of the multiple-pixel master LED lamp beads 100, and the remaining row scan output ports of the master board are respectively connected to the power supply positive terminals of each row of pixels, and the master board 300 controls the power supply of each row of pixels row by row. In some embodiments, the master board 300 can comprise a master and a plurality of decoders connected thereto, and each channel output port of the decoder is connected to each row scan output port of the master board 300, and when the channel output port of the decoder is high, a forward voltage is provided to the light-emitting device power supply positive terminal of the corresponding row, that is, a row scan signal of the row of pixels is provided.

[0047] The data port of the master control board 300 is serially connected with the communication pins (SDI, CLKI, SDO, CLKO) of the multi-pixel master control LED lamp bead 100. The master control board 300 can output control signals to the serially connected multi-pixel master control LED lamp beads 100.

[0048] As an example, the data communication and control flow of the LED display module for each frame of image can include: S10, the master control board 300 sends the first row data signal and the clock signal of the current frame, at the same time, the first row of row scanning ports outputs the forward voltage, and the second row to the Mth row of row scanning ports do not output the forward voltage; S11, in the pixel matrix, the input pin SDI of the first multi-pixel master control LED lamp bead 100 of the first row receives N data signal packets from the master control board 300, and the clock input pin CLKI receives the clock signal; the first multi-pixel master control LED lamp bead 100 controls the light-emitting state of the light-emitting chip in it according to the first data signal packet; the first multi-pixel master control LED lamp 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; S12, in the pixel matrix, the subsequent multi-pixel master control LED lamp beads 100 of the first row all receive the data packets and the clock signal sent by the previous multi-pixel master control LED lamp bead 100, take out the first data signal packet, control the light-emitting state of the light-emitting chip in it according to the first data signal packet, and then pass the remaining data signal packets and the clock signal to the next multi-pixel master control LED lamp bead 100; until the last multi-pixel master control LED lamp bead 100, at this time, the first row of the mother lamp displays the first row of image of the current frame picture; S20, the master control board 300 sends the second row data signal and the clock signal of the current frame, at the same time, the second row of row scanning ports outputs the forward voltage, and the remaining row scanning ports do not output the forward voltage; S21, in the pixel matrix, the input pin SDI of the first multi-pixel master control LED lamp bead 100 of the first row receives N data signal packets from the master control board 300, and the clock input pin CLKI receives the clock signal; the first multi-pixel master control LED lamp bead 100 controls the light-emitting state of the second row of controlled LED lamp beads connected according to the first data signal packet; the first multi-pixel master control LED lamp 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; S22, in the pixel matrix, the subsequent multi-pixel master LED lamp beads 100 of the first row all receive the data packet and clock signal sent by the previous multi-pixel master LED lamp bead 100, take out the first data signal packet, control the light-emitting state of the second row of controlled LED lamp beads connected according to the first data signal packet, and then transmit the remaining data signal packet and clock signal to the next multi-pixel master LED lamp bead 100; until the last multi-pixel master LED lamp bead 100, at this time, the second row of sub-lamps displays the second row of images of the frame picture; S30, by analogy, until the first frame Mth row of sub-lamps displays the Mth row of images of the frame picture.

[0049] Embodiment three Referring to Figure 10 , the application provides a multi-pixel master LED lamp bead 100' embodiment, which is different from the embodiment one in that the pixel access pin includes the column pixel access pin (CRL, CGL, CBL) and the row pixel access pin (RLED2, GLED2, BLED2). The column pixel access pin (CRL, CGL, CBL) and the row pixel access pin (RLED2, GLED2, BLED2) can each include multiple color channels. The row pixel access pin can include multiple groups (xLED2, …, xLEDN).

[0050] The column pixel access pin (CRL, CGL, CBL) is used to access the power negative end of the multi-pixel master LED lamp bead 100' in the same column. The row pixel access pin (RLED2, GLED2, BLED2) is used to access the power negative end of the multi-pixel master LED lamp bead 100' in different columns.

[0051] In this embodiment, the multi-pixel master LED lamp bead 100' can control the light-emitting state of the controlled LED lamp beads in different columns in addition to the light-emitting state of the controlled LED lamp beads in the same column.

[0052] This embodiment can further reduce the number of multi-pixel master LED lamp beads in the LED display screen, and does not need to use a multi-pixel master LED lamp bead for each column of pixels, further reducing the device cost of the LED display screen.

[0053] Embodiment four Referring to Figure 11The application provides an LED display module, which comprises a pixel matrix and a main control board 300'. The pixel matrix comprises a plurality of sub-matrices. The first pixel of the first column of pixels of the sub-matrices is a multi-pixel main control LED lamp bead 100' of embodiment three. The remaining pixels of the first column of pixels of the sub-matrices are controlled LED lamp beads 200' connected to the current column pixel access pins (CRL, CGL and CBL) of the multi-pixel main control LED lamp bead 100'. The remaining column pixels of the sub-matrices are controlled LED lamp beads 200' connected to the other column pixel access pins (RLED2, GLED2 and BLED2) of the multi-pixel main control LED lamp bead 100'.

[0054] The first row of pixels of the pixel matrix comprises the multi-pixel main control LED lamp bead 100' and the controlled LED lamp bead 200'. The remaining rows of pixels of the pixel matrix are controlled LED lamp beads 200'.

[0055] The first row of row scanning output ports of the main control board 300' is connected to the light-emitting power supply pins VCC of the multi-pixel main control LED lamp bead 100' in the plurality of sub-matrices and the power supply positive end of the controlled LED lamp bead 200' in the first row of pixels. The remaining row scanning output ports of the main control board 300' are respectively connected to the power supply positive ends of the remaining rows of pixels. The main control board 300' controls the power supply of the rows of pixels in sequence. In some embodiments, the main control board 300' can comprise a main controller and a plurality of decoders connected thereto. The channel output ports of the decoders are respectively connected to the row scanning output ports of the main control board 300'. When the channel output ports of the decoders are high, the power supply positive end of the light-emitting device of the corresponding row is provided with a forward voltage, that is, the row scanning signal of the row of pixels is provided.

[0056] 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 lamp bead 100'.

[0057] The difference between the data communication and control process of the LED display module of the embodiment and that of embodiment two is that the data signal package received by the multi-pixel main control LED lamp bead 100' comprises the control signal of the light-emitting state of the light-emitting chip itself or the controlled LED lamp bead 200' in the same column as itself, and the control signal of the light-emitting state of the controlled LED lamp bead 200' in the same sub-matrix but in a different column as itself. After the row scanning signal is sent, the multi-pixel main control LED lamp bead 100' also controls the light-emitting state of the controlled LED lamp bead 200' connected to the other column pixel access pins (RLED2, GLED2 and BLED2).

[0058] Embodiment five Reference is made to Figure 12 The application provides a multi-pixel main control LED lamp bead 100" embodiment, which is different from that of embodiment three in that: The pins further include a first row of pixel power supply pins V1 and the rest of the row of pixel power supply pins (V2, …, VM), the first row of pixel power supply pins V1 being configured to provide power supply access for a plurality of controlled LED lamp beads in the same row as the multi-pixel master LED lamp bead 100" and the rest of the row of pixel power supply pins (V2, …, VM) being configured to provide power supply access for a plurality of controlled LED lamp beads in different rows from the multi-pixel master LED lamp bead 100". The driving chip 130 further includes a row selection module 135 connected to the master control unit 133, the light-emitting power supply pin VCC, the first row of pixel power supply pins V1 and the rest of the row of pixel power supply pins (V2, …, VM), configured to make the light-emitting power supply pin VCC communicate with a selected pin among the first row of pixel power supply pins V1 and the rest of the row of pixel power supply pins (V2, …, VM) according to the control of the master control unit 133, so as to provide power supply access for the controlled LED lamp beads in the row of the selected pin, and to realize partial row scanning function.

[0059] In this embodiment, the partial row scanning function is also integrated in the multi-pixel master LED lamp bead, which can further simplify the setting of other control modules of the LED display screen and reduce the wiring complexity.

[0060] Embodiment six Referring to Figure 13 , the present application provides an LED display module embodiment, which includes a pixel matrix and a master control board 300", the pixel matrix including a plurality of sub-matrices, the first column of pixels of the sub-matrices being the multi-pixel master LED lamp bead 100" of embodiment five, the rest of the pixels of the first column of pixels of the sub-matrices being the controlled LED lamp bead 200" connected to the current column pixel access pin (CRL, CGL, CBL) of the multi-pixel master LED lamp bead 100", and the rest of the columns of pixels of the sub-matrices being the controlled LED lamp bead 200" connected to the other column pixel access pin (xLED2, xLED3, …, xLEDN) of the multi-pixel master LED lamp bead 100".

[0061] The first row of pixels of the pixel matrix includes the multi-pixel master LED lamp bead 100" and the controlled LED lamp bead 200", and the rest of the rows of pixels of the pixel matrix are the controlled LED lamp bead 200".

[0062] The row scanning power supply port of the master control board 300" is connected to the light-emitting power supply pin VCC of the multi-pixel master LED lamp bead 100" in the plurality of sub-matrices, and the first row of pixel power supply pins V1 of the multi-pixel master LED lamp bead 100" are connected to the power supply positive terminals of the controlled LED lamp beads 200" in the first row of pixels in the same sub-matrix.

[0063] The remaining row pixel power supply pins V2, …, VM of the multi-pixel master LED lamp bead 100" are respectively connected to the positive power supply terminals of the remaining row pixels in the same sub-matrix, and the driving chip of the multi-pixel master LED lamp bead 100" controls the power supply of each row pixel in the same sub-matrix row by row.

[0064] The data port of the master control board 300" is serially connected with the communication pins SDI, CLKI, SDO, and CLKO of the multi-pixel master LED lamp bead 100".

[0065] The data communication and control process of the LED display module of the embodiment is different from that of the fourth embodiment in that the row scanning power supply port of the master control board 300" can provide a forward voltage for the controlled LED lamp bead 200" connected with the multi-pixel master LED lamp bead 100" in the sub-matrix, the data signal package received by the multi-pixel master LED lamp bead 100" further includes a row scanning signal, and the multi-pixel master LED lamp bead 100" controls the row selection module 135 to provide the row scanning signal to the controlled LED lamp bead 200" in the same sub-matrix.

[0066] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and should not be interpreted in an idealized or overly formal sense unless specifically so defined.

[0067] It should be noted that certain terms have been used throughout the specification in order to describe various embodiments. Those skilled in the art will understand that different manufacturers, producers, and / or vendors can refer to a particular element using different terminology. The specification does not distinguish between terms that differ only in name but have the same meaning. Rather, the specification distinguishes between elements based on functional differences.

[0068] The technical features of the above embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but it should be considered that any combination of the technical features is within the scope of the specification.

[0069] In addition, those skilled in the art will understand that although some embodiments described herein include certain features that are not included in other embodiments, the combination of features of different embodiments means that it is within the scope of the present application and forms different embodiments.

[0070] Those skilled in the art can understand that the modules in the device in the embodiments can be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or components in the embodiments can be combined into one module or unit or component, and furthermore can be divided into multiple sub-modules or sub-units or sub-components. Except that at least some of such features and / or processes or units are mutually exclusive, any combination of all the features disclosed in the specification and all the processes or units of any method or device disclosed thus can be adopted. Unless explicitly stated otherwise, each feature disclosed in the specification can be replaced by an alternative feature providing the same, equivalent or similar purpose.

[0071] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

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.

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 being connected with an external power supply through a power supply port and a grounding port, for supplying power for the driving chip.

3. The multi-pixel master LED lamp bead according to claim 1, characterized in that, 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 being electrically connected with a negative 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 bead, 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 bead.

4. 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, 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, 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, for outputting data to be transmitted to a downstream device to the data output pin.

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

6. The multi-pixel master LED lamp bead according to any one of claims 1 to 5, 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 the multi-pixel master LED lamp bead; and a different column pixel access pin for accessing a plurality of controlled LED lamp beads in a different column as the multi-pixel master LED lamp bead.

7. The multi-pixel master LED lamp bead according to claim 6, 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 multi-pixel master LED lamp bead. 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.

8. 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 the plurality of pixel master control LED lamp beads according to any one of claims 1 to 5 at the head, and a plurality of controlled LED lamp beads connected to the pixel access pins of the plurality of pixel master control LED lamp beads; The first row pixels of the pixel matrix each are the plurality of 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 plurality of pixel master control LED lamp beads, 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 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 pins of the plurality of pixel master control LED lamp beads.

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 the plurality of pixel master control LED lamp beads 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 plurality of pixel master control LED lamp beads, and the rest column pixels of the sub-matrices are controlled LED lamp beads connected to the other column pixel access pins of the plurality of pixel master control LED lamp beads; The first row pixels of the pixel matrix each comprise the plurality of pixel master control LED lamp beads and controlled 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 plurality of pixel master control LED lamp beads in the sub-matrices and the power supply positive terminals of the controlled LED lamp beads in the first row pixels, 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 pins of the plurality of pixel master control LED lamp beads.

10. 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 the plurality of pixel master control LED lamp beads according to claim 7, 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 plurality of pixel master control LED lamp beads, and the rest column pixels of the sub-matrices are controlled LED lamp beads connected to the other column pixel access pins of the plurality of pixel master control LED lamp beads; The first row pixels of the pixel matrix each comprise the plurality of pixel master control LED lamp beads and controlled LED lamp beads, 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.

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