TW202008769A - Display device - Google Patents

Abstract

A display device, comprising: a clock serial bus for providing a clock synchronization signal; a data serial bus for transferring communication data, wherein the communication data comprises serial communication data and bus communication data; a plurality of communication devices cascaded with one another by means of the data serial bus and the clock serial bus, and display modules connected to the communication devices, wherein the communication devices each comprise a bus mode/serial mode multiplexer for switching between a bus communication mode and a serial communication mode, the plurality of communication devices realizes synchronous transmission of communication data with the clock synchronization signal by means of the bus mode/serial mode multiplexer, and the communication devices are further configured to receive the serial communication data and output a serial control signal according to the serial communication data to control the display of the display module. The display device can realize the synchronous display of multiple display modules.

Description

Display device

The invention belongs to the field of computer technology, especially a display device.

In the field of computer data transmission, UART, SPI and I2C communication interface standards have long been used. Although they are widely used, they are a low data rate data transmission standard. With the increase of computer display resolution (2k, 4k, 8k), the development of large-capacity storage devices has no ability to support higher-level functional operations between devices. The circuits of the existing communication interface standards are mostly complicated and inconvenient to connect with peripheral devices. At the same time, traditional data transmission methods mostly adopt master-slave structure and addressing to transmit data, so it may cause signal delay during data transmission, which will affect the synchronous transmission of data between the communication device and peripheral equipment.

The following describes in detail the detailed features and advantages of the creation in the embodiments. The content is sufficient for any person skilled in the relevant art to understand and implement the technical content of the creation, and according to the content disclosed in this specification, the scope of patent application and the drawings Anyone who is familiar with related skills can easily understand the purpose and advantages of this creation.

The main purpose of the present invention is to realize synchronous display of multiple display modules.

To achieve the above object, the present invention is a display device including: a clock serial bus for providing a clock synchronization signal for a communication control link; and a data serial bus for transmitting a data to be communicated, wherein, The data to be communicated includes a serial communication data and a bus communication data; a plurality of communication devices cascaded by a clock serial bus and a data serial bus and a display module connected to the communication device, wherein the communication device includes a bus mode/ Serial mode multiplexer, bus mode/serial mode multiplexer is used to switch between a bus communication mode and a serial communication mode, multiple communication devices use this bus mode/serial mode multiplex selection The device realizes the synchronous transmission of the data to be communicated under the clock synchronization signal; the communication device is also used to receive the serial communication data and output a control signal according to the serial communication data to control the display module to display.

According to an embodiment of the present invention, wherein the communication device further includes a decoding module, the decoding module is used to decode the bus communication data to generate command data with a preset number of data bits in the bus communication mode; , Commands, and parameters.

According to an embodiment of the present invention, the bus mode/serial mode multiplexer is further used to receive command data and switch the communication device from the bus communication mode to the serial communication mode according to the command data.

According to an embodiment of the present invention, the communication device further includes a counting module. The counting module is used for receiving and counting the number of display modules and the number of transmitted data bits, and generates a latch signal after the counting is completed.

According to an embodiment of the present invention, the bus mode/serial mode multiplexer is further used to receive the latch signal and switch the communication device from the serial communication mode to the bus communication mode according to the latch signal.

According to an embodiment of the present invention, the communication device further includes a bus data receiving shift register and a serial bus shift register; the input terminal of the bus data receiving shift register is connected to the clock serial bus and the data serial bus respectively; the output terminal Connected to the decoder module; used to receive and store command data; the input terminal of the serial bus shift register is connected to the clock serial bus and the data serial bus; the output terminal is connected to the input terminal of the multiplexer; used to receive and store Data to be communicated.

According to an embodiment of the present invention, the communication device further includes a configuration register, which is connected to the decoding module for receiving and storing parameters; and is also used for configuring the current output to the display module.

According to an embodiment of the present invention, the communication device further includes an output control module, connected between the serial bus shift register and the display module, and used to control the output current output to the display module.

According to an embodiment of the present invention, the communication device further includes a constant current module, connected between the output control module and the display module, for maintaining a constant output of the output current.

According to an embodiment of the present invention, the communication device further includes a current adjustment module. The current adjustment module is connected to the constant current module and is used to adjust the magnitude of the current output by the constant current module.

The following describes the implementation of the present invention through specific examples. Those familiar with this skill can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

The structure, ratio, size, etc. shown in the drawings of this specification are only used to match the contents disclosed in the specification, for those who are familiar with this skill to understand and read, not to limit the implementation of the present invention. Conditions, so it has no technical significance, any modification of structure, change of proportional relationship or adjustment of size should still fall within the scope of the present invention without affecting the efficacy and the purpose of the present invention. The disclosed technical content can be covered. At the same time, the terms such as "one", "two", and "upper" cited in this specification are only for the convenience of description, and are not intended to limit the scope of the invention, the change of the relative relationship or Adjustments, without substantial changes in the technical content, should also be regarded as the scope of the invention.

Please refer to FIG. 1, which is a schematic diagram of a communication control link in an embodiment. The communication control link is used to realize the synchronous transmission of data, and may include: clock serial bus SCLK, data serial bus SDI, multiple communication devices 10 cascaded through clock serial bus SCLK and data serial bus SDI, and communication The display module 20 to which the device 10 is connected. The communication device 10 includes a bus mode/serial mode multiplexer 110, and the bus mode/serial mode multiplexer 110 is used to switch between the bus communication mode and the serial communication mode. The clock serial bus SCLK is used to provide a clock synchronization signal for the communication control link. The data serial bus SDI is used to transmit data to be communicated; among them, the data to be communicated includes serial communication data and bus communication data. The multiple communication devices 10 realize the synchronous transmission of the data to be communicated under the clock synchronization signal through the bus mode/serial mode multiplexer 110. The communication device 10 is also used to receive serial communication data and output control signals according to the serial communication data to control the display module 20 to display.

In the above embodiment, by using two signal lines (clock serial bus and data serial bus) to cascade multiple communication devices, this application is simpler to implement and more convenient to connect with the display module at the same time; further, The bus mode/serial mode multiplexer can be used to switch between the bus communication mode and the serial communication mode within the communication device, thereby achieving the synchronous transmission of data. Compared with the traditional mode, the master-slave structure Address transmission and other methods avoid the signal delay caused by the master-slave structure to send data, which in turn affects the synchronous transmission of data between the communication device and the display module.

Please refer to FIG. 2, which is a schematic diagram of a display device in another embodiment. The communication device 10 may further include a decoding module 120. The decoding module 120 is used to decode the bus communication data to generate command data with a preset number of data bits in the bus communication mode; wherein, the command data is composed of a leading head, commands, and parameters . The parameters may include parameter 1 and parameter 2. For example, please refer to FIG. 3 for assistance, which is a schematic diagram of composition of command data in an embodiment. The command data of this application can be composed of a 40-bit command data consisting of a leading header, a command word, parameter 1, and parameter 2, where commands can generally be divided into CODE=1 and CODE=0. Parameter 1 and parameter 2 can be defined according to the actual operation needs of the user. In this application, parameter 1 is defined as the number of connected display modules, and parameter 2 is defined as the display length. At the same time, according to the functional requirements of the communication device 10, different commands and parameters can be constructed. The bus mode/serial mode multiplexer 110 is also the MUX in FIG. 2 and is also used to receive the command data generated by the decoding module 120 and to switch the communication link from the bus communication mode to the serial communication according to the command data. mode. The bus mode/serial mode multiplexer MUX actually receives the commands in the command data, and switches between the bus communication mode and the serial communication mode according to the commands. It can be seen from the composition of the command data that this application cancels the data start bit and stop bit transmission modes that restrict the serial communication rate in the traditional serial bus communication, so that the maximum transmission rate of the communication device is the system clock frequency, which can meet the high speed Communication needs. After testing and verification, the maximum transmission rate of the communication device of the present application is above 20 Mbps.

The communication device 10 can also expand a variety of functions by constructing a command set; for example, by sending a token command, the serial communication mode is used to generate its physical address in each communication device 10, and in the bus communication mode, the communication device 10 can correspond Address, to achieve high-speed point-to-point, point-to-multipoint, addressing and other operations; the final output loop of the link can be connected to the control MCU to realize the response mechanism in the half-duplex working mode; further, by adding one The data serial bus uses the communication device 10 of the present application to realize a full-duplex working mode.

The display module 20 may be a plurality of LED (light emitting diode) lights of the same color or different colors. Exemplarily, the present application uses three outputs, that is, one communication device is connected to three LED lights. It can be understood that in specific implementation , The specific number can be selected according to need, can be five. At the same time, the output pins can be arranged at will.

Please continue to refer to FIG. 2. The communication device 10 may further include a counting module 130. The counting module 130 is used for receiving and counting the number of display modules 20 and the number of transmitted data bits, and generates a latch signal after the counting is completed. The bus mode/serial mode multiplexer MUX is also used to receive the latch signal and switch the communication device from the serial communication mode to the bus communication mode according to the latch signal. Specifically, the counting module 130 is mainly used for receiving and counting the number of display modules 20 and the number of transmitted data bits. For example, the communication device 10 is connected to three display modules 20 which are LED01, LED02, and LED03, respectively. The number of data bits is 40 bits, which is the number of command data. When the entire communication device is in the serial communication mode, the counting module 130 starts to count the number of display modules 20 and the number of transmitted data bits, and After the counting is completed, a latch signal is generated. Latching is to temporarily store the signal to maintain a certain level state. After receiving the latch signal, the bus mode/serial mode multiplexer MUX automatically switches the communication control link from the current serial communication mode to the bus communication mode, and restarts receiving the next command data. Further, the counting module 130 may further include a counting unit 131 and a display control unit 132, and the counting unit is used to receive and count the number of display modules 20 and the number of transmitted data bits. The display control unit 132 is used to generate a latch signal after the counting is completed, that is, LE in FIG. 2. The display control unit 132 is also used to generate a current-on signal, that is, OE in FIG. 2.

Please continue to refer to FIG. 2, the communication device 10 may further include a bus data receiving shift register 140 and a serial bus shift register 150; the input ends of the bus data receiving shift register 140 are respectively connected to a clock serial bus SCLK, a data serial bus SDI; output terminal decoding module 120; used to receive and store command data. The input terminals of the serial bus shift register 150 are respectively connected to the clock serial bus SCLK and the data serial bus SDI; the output terminal is connected to the input terminal of the multiplexer 110; and used to receive and store data to be communicated. The serial bus shift register 150 is also FD1, FD2, and FD3 in FIG. 2. Among them, FD1, FD2, and FD3 are the same type of shift register, and the description here is only for distinction. A shift register is a device based on flip-flops that operates under several same time pulses. Data is input to the device in parallel or serial manner, and then each time pulse moves one to the left or right in turn. Bits, output at the output.

Please continue to refer to FIG. 2. The communication device 10 may further include a configuration register 160. The configuration register 160 is connected to the decoding module 120 for receiving and storing parameters. It is also used for configuring the current output to the display module 20. Further, the configuration register 160 may include a current configuration register (not shown in the figure), a display module register (not shown in the figure) and a display length register (not shown in the figure). The current configuration register (not shown in the figure) is used to configure the output current output to the display module 20. The display module register (not shown in the figure) is connected to the counting unit 131 in the counting module 130 for storing the number of the display module 20. The display length register (not shown in the figure) is connected to the counting unit 131 in the counting module 130, and is used to store the number of data bits of the command data. In this application, parameter 1 and parameter 2 in the command data are stored by setting the configuration register 160, so that subsequent connection with other peripheral devices does not require repeated definition of parameter 1 and parameter 2, so that the display device of this application It is easier to operate.

Please continue to refer to FIG. 2. The communication device 10 may further include an output control module 170 connected between the serial bus shift register 150 and the display module 20 for controlling the output current output to the display module 20. The output control module may include a buffer register 172 connected to the serial bus shift register 150 for receiving and storing the serial communication data. The buffer register 172 is LRGB[2] and LRGB[1 in FIG. 2 ] And LRGB[0]. Among them, LRGB[2], LRGB[1] and LRGB[0] are the same kind of cache register device, and the description here is only for distinction. The conducting unit 171 is connected between the buffer register 172 and the display module 20, and is used to receive the current conducting signal and control the output current output to the display module 20 according to the current conducting signal. The conducting unit 171 is OR, OB, OC in FIG. 2. Among them, OR, OB, OC are the same kind of conducting unit, and the description here is only for distinction.

Please continue to refer to FIG. 2. The communication device 10 may further include a constant current module 180 connected between the output control module 180 and the display module 20 for maintaining a constant output of the output current. Based on the characteristics of the LED lamp, when driving the LED lamp for display, a constant current drive is required. At the same time, in order to keep the LED lamp's light emission more stable, it is also necessary to ensure the constant current drive of the LED lamp.

Please continue to refer to FIG. 2. The communication device 10 may further include a current adjustment module 190. The current adjustment module 190 is connected to the constant current module 180 to adjust the current output by the constant current module 180. The current adjustment module 190 can make up for the problem that the configuration current in the current configuration register (not shown in the figure) cannot be set externally. The configuration current in the current configuration register (not shown in the figure) is generally based on the factory settings at the factory. After setting the current adjustment module 190, the user can adjust the current output to the LED lamp according to his own needs.

Please continue to refer to FIG. 2. The communication device 10 may further include a crystal oscillator. The crystal oscillator is connected to the decoding module 120 for providing an internal clock signal for the decoding module 120. The clock signal is output after being driven by the BUFF buffer, and the communication devices 10 at all levels receive it synchronously. The generation of the switching command can also be generated by stopping the clock and using the input interval at which the internal oscillator sampling clock stops. Using the internal crystal oscillator clock sampling function, the external input clock can be cancelled, which is the clock serial bus SCLK. In this case, the communication device can be transmitted in RS232 mode or PWM mode (duty cycle), and the bus mode can also be implemented /Serial mode switch transmission, then only one communication line is used in the entire communication process, which is the data serial bus SDI.

Based on the above, combined with FIGS. 2 and 4, the principle of the display device is as follows: the data input and clock input of the bus data receiving shift register 140 and the serial bus shift register 150 are connected together, the communication device 10 and the display module 20 The display system composed of other peripheral circuits is generally in the bus state (BUSState=1) when it is turned on. The bus mode/serial mode multiplexer MUX selects SDI as the SDO output. At this time, the entire system is in the bus communication mode receiving state. In the bus communication mode, each communication device 10 receives command data synchronously, and the decoding module 120 will decode according to different command data requirements. When the communication device 10 receives a command request to enter the serial communication mode, internally sets BUSState=0, the bus mode/serial mode multiplexer MUX switches the SDO output to the output inSDI of the serial bus shift register 150, communication The device 10 enters a serial receiving state. When entering the serial bus communication state, the counting module 130 performs receiving counting according to the number of cascaded communication devices 10 in the communication control link and the number of data bits to be received by each communication device 10 (this application is 3-bit data). After completing the data transmission to the entire communication control link cascade communication device 10, a latch signal LE is generated to output the data to the buffer register 172, that is, LRGB2, LRGB1, LRGB0 in FIG. The synchronous operation of each cascade communication device 10 is realized. Further, before requesting the serial communication bus to send (ASKSend) command (CODE=1), you can also send as many different commands as needed. In this application, the send command (CODE=0) is set to the configuration register 160 The current configuration register (not shown in the figure) generates a WRCR pulse to configure the output current inside the display device. After receiving the data to be communicated, the device generates a DispBegin pulse to control the conduction unit 170 to output the current according to the configured current. The streaming module 180 drives the display module 20 to emit light, and at the same time, the counting module 130 in the communication device 10 starts counting. When the count reaches the defined "display length", the display control unit 132 of the communication device 10 sets OE=1, causing the entire device to stop Output current. After completing receiving data, the communication device 10 internally sets the bus state BUSState=1, restores to the bus communication mode receiving state, and receives command data again.

The communication device 10 of the present application sends commands and parameters in the bus communication mode, requests to switch to the serial communication mode, performs data synchronization transmission in the serial communication mode, and controls the output current value configured inside the communication device during data transmission The display module 20 performs display, and the circuit returns to the bus communication mode after the serial communication is completed, so as to receive commands and parameters again.

Of course, the above description is only a preferred embodiment of the present invention, and the present invention is not limited to enumerating the above embodiments. It should be noted that any person skilled in the art can make all equivalent substitutions under the teaching of this specification The obvious deformation forms all fall within the substantive scope of this specification and should be protected by the present invention.

1‧‧‧parameter 10‧‧‧Communication device 110‧‧‧Bus mode/serial mode multiplexer 120‧‧‧decoding module 130‧‧‧Counting module 131‧‧‧Counting unit 132‧‧‧Display control unit 140‧‧‧bus data receive shift register 150‧‧‧Serial bus shift register 160‧‧‧Configuration register 170‧‧‧ output control module 171‧‧‧Conduction unit 172‧‧‧Cache register 180‧‧‧Constant current module 190‧‧‧ current adjustment module 2‧‧‧parameter 20‧‧‧Display module SCLK‧‧‧Clock Serial Bus SDI‧‧‧Data serial bus

FIG. 1 is a schematic diagram of a display device in an embodiment.

2 is a schematic diagram of the principle of a display device in another embodiment.

FIG. 3 is a schematic diagram of the composition of command data in an embodiment.

FIG. 4 is a simulation waveform diagram of the display device in an embodiment.

10‧‧‧Communication device

110‧‧‧Bus mode/serial mode multiplexer

20‧‧‧Display module

Claims (10)

A display device including: A clock serial bus, used to provide clock synchronization signals for a communication control link; A data serial bus is used to transmit a data to be communicated, wherein the data to be communicated includes a serial communication data and a bus communication data; Multiple communication devices cascaded through the clock serial bus and the data serial bus, and a display module connected to the communication device, wherein the communication device includes a bus mode/serial mode multiplexer, the bus mode /Serial mode multiplexer is used to switch between a bus communication mode and a serial communication mode. A number of the communication devices use the bus mode/serial mode multiplexer to realize the synchronization under the clock synchronization signal. Synchronous transmission of the data to be communicated; The communication device is also used to receive the serial communication data and output a control signal according to the serial communication data to control the display module to display. The display device as described in item 1 of the patent application scope, wherein the communication device further includes a decoding module for decoding the bus communication data to generate command data with a preset number of data bits in the bus communication mode ; Among them, the order data is made up of leading head, order, parameter. The display device as described in item 2 of the patent application scope, wherein the bus mode/serial mode multiplexer is also used to receive the command data and switch the communication device from the bus communication mode to the serial according to the command data Communication mode. The display device as described in item 2 of the patent application scope, wherein the communication device further includes a counting module, the counting module is used for receiving and counting the number of display modules and the number of data bits transmitted, and after the counting is completed Generate latch signal. The display device as described in item 4 of the patent application scope, wherein the bus mode/serial mode multiplexer is also used to receive the latch signal and switch the communication device from the serial communication mode according to the latch signal To bus communication mode. The display device as described in item 2 of the patent application scope, wherein the communication device further includes a bus data receiving shift register and a serial bus shift register; The input terminal of the bus data receiving shift register is respectively connected to the clock serial bus and the data serial bus; the output terminal is connected to the decoding module; used to receive and store the command data; The input terminal of the serial bus shift register is respectively connected to the clock serial bus and the data serial bus; the output terminal is connected to the input terminal of the multiplexer; and used to receive and store the data to be communicated. The display device as described in item 2 of the patent application scope, wherein the communication device further includes a configuration register connected to the decoding module for receiving and storing the parameter; and also for configuring the output to the display module Current. The display device as described in item 6 of the patent application scope, wherein the communication device further includes an output control module, connected between the serial bus shift register and the display module, for controlling the output current output to the display module size. The display device as described in item 8 of the patent application range, wherein the communication device further includes a constant current module, connected between the output control module and the display module, for maintaining a constant output of the output current. The display device as described in item 9 of the patent application scope, wherein the communication device further includes a current adjustment module, the current adjustment module is connected to the constant current module, and is used to adjust the magnitude of the current output by the constant current module.

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