WO2020019872A1

WO2020019872A1 - Display device

Info

Publication number: WO2020019872A1
Application number: PCT/CN2019/089821
Authority: WO
Inventors: 李赤; 梁丕树
Original assignee: 深圳市爱协生科技有限公司; 李赤
Priority date: 2018-07-26
Filing date: 2019-06-03
Publication date: 2020-01-30
Also published as: TWI698123B; TW202008769A; CN110782828B; CN110782828A

Abstract

A display device, comprising: a clock serial bus (SCLK) for providing a clock synchronization signal; a data serial bus (SDI) for transferring communication data, wherein the communication data comprises serial communication data and bus communication data; a plurality of communication devices (10) cascaded with one another by means of the data serial bus (SDI) and the clock serial bus (SCLK), and display modules (20) connected to the communication devices (10), wherein the communication devices (10) each comprise a bus mode/serial mode multiplexer (110) for switching between a bus communication mode and a serial communication mode, the plurality of communication devices (10) realizes synchronous transmission of communication data with the clock synchronization signal by means of the bus mode/serial mode multiplexer (110), and the communication devices (10) 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 (20). The display device can realize the synchronous display of multiple display modules (20).

Description

Display device

Technical field

The present invention relates to the field of computer technology, and in particular, to a display device.

Background technique

In the field of computer data transmission, UART, SPI and I2C communication interface standards have been used for a long time. Although they are widely used, they are a low data rate data transmission standard. With the improvement of computer display resolution (2k, 4k 8k), the development of large-capacity storage devices, is no longer capable of supporting functional operations between higher-level devices. Most of the circuits of the existing communication interface standards are relatively complicated and inconvenient when connecting with peripheral devices. At the same time, most of the traditional data transmission methods use the master-slave structure and the addressing method to transmit data, so the signal may be delayed during data transmission, which will affect the synchronous transmission of data between communication devices and peripheral devices.

Summary of the Invention

Based on this, it is necessary to provide a display device in response to the above problems.

A display device includes:

A clock serial bus, configured to provide a clock synchronization signal for the communication control link;

A data serial bus for transmitting data to be communicated, wherein the data to be communicated includes serial communication data and 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, and the bus mode / serial mode multiplexer is used to switch between the bus communication mode and the serial communication mode; a plurality of the communications The device realizes synchronous transmission of the data to be communicated under the clock synchronization signal through the bus mode / serial mode multiplexer;

The communication device is further configured to receive the serial communication data and output a control signal according to the serial communication data to control the display module to perform display.

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

In one embodiment, the communication device further includes a decoding module, and the decoding module is configured to decode the bus communication data in the bus communication mode to generate command data with a preset number of data bits; The command data is composed of a boot header, a command, and a parameter.

In one embodiment, the bus mode / serial mode multiplexer is further configured to receive the command data, and switch the communication device from the bus communication mode to the serial communication mode according to the command data.

In one embodiment, the communication device further includes a counting module, and the counting module is configured to receive and count the number of the display module and the number of data bits transmitted, and generate a latch after the counting is completed. signal.

In one embodiment, the bus mode / serial mode multiplexer is further configured to receive the latch signal and switch the communication device from serial communication mode to bus communication according to the latch signal. mode.

In one embodiment, the communication device further includes a bus data receiving shift register and a serial bus shift register;

An input end of the bus data receiving shift register is respectively connected to the clock serial bus and the data serial bus; an output end is connected to the decoding module; and used to receive and store the command data;

An input end of the serial bus shift register is respectively connected to the clock serial bus and the data serial bus; an output end is connected to an input end of the multiplexer; and is used to receive and store the data to be communicated. .

In one embodiment, the communication device further includes a configuration register, which is connected to the decoding module for receiving and storing the parameter; and for configuring a current output to the display module.

In one embodiment, the communication device further includes an output control module, which is connected between the serial bus shift register and the display module, and is used to control the output current output to the display module.

In one embodiment, 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.

In one embodiment, the communication device further includes a current adjustment module, and the current adjustment module is connected to the constant current module and is configured to adjust the current output by the constant current module.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a display device according to an embodiment; FIG.

2 is a schematic diagram of a display device in another embodiment;

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

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

detailed description

In order to facilitate understanding of the present invention, the present invention will be described more fully with reference to the accompanying drawings. The drawings show a preferred embodiment of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough understanding of the present disclosure.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms used herein in the description of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention.

Please refer to FIG. 1, which is a schematic diagram of a communication control link according to an embodiment. The communication control link is used to realize the synchronous transmission of data, and may include: a clock serial bus SCLK, a data serial bus SDI, a plurality of communication devices 10 cascaded through the clock serial bus SCLK and the data serial bus SDI, and A display module 20 connected to the communication device 10. 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; wherein the data to be communicated includes serial communication data and bus communication data. The plurality of communication devices 10 implements synchronous transmission of data to be communicated under a clock synchronization signal through a bus mode / serial mode multiplexer 110. The communication device 10 is further configured to receive serial communication data and output a control signal to control the display module 20 to perform display according to the serial communication data.

In the above embodiment, by using two signal lines (clock serial bus, data serial bus) to cascade multiple communication devices, the application is simpler to implement, and it is more convenient to connect with the display module at the same time; further, because The bus mode / serial mode multiplexer can be used to switch between the bus communication mode and the serial communication mode inside the communication device, thereby achieving the synchronous transmission of data. Compared with the traditional mode, the master-slave structure and the Address sending and other methods avoid the problem of signal delay caused by the use of 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 configured to decode the bus communication data in the bus communication mode to generate command data with a preset number of data bits. The command data is composed of a boot header, a command, and a parameter. . The parameters may include

parameters

1 and 2. For example, please refer to FIG. 3 for assistance, which is a schematic diagram of the composition of command data in an embodiment. The command data of the present application can be composed of a 40-bit command data by a boot header, a command word, a parameter 1, and a parameter 2. The command can be generally divided into CODE = 1 and CODE = 0. Parameter 1 and parameter 2 can be defined according to the actual 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, different commands and parameters can be constructed according to the functional requirements of the communication device 10. The bus mode / serial mode multiplexer 110 is the MUX in FIG. 2, and is also used to receive the command data decoded by the decoding module 120 and switch the communication link from the bus communication mode to the serial according to the command data. Communication mode. The bus mode / serial mode multiplexer MUX actually receives the command in the command data, and realizes the switch between the bus communication mode and the serial communication mode according to the command. As can be seen from the composition of the command data, the present application cancels the data start bit and stop bit transmission modes that restrict the serial communication rate in 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, using serial communication mode to generate its physical address in each communication device 10, in the bus communication mode, the communication device 10 can be used. Corresponding address, to achieve high-speed point-to-point, point-to-multipoint, addressing and sending operations; the final output loop of the link can be connected to the control MCU to achieve the response mechanism in half-duplex working mode; One data serial bus, using the communication device 10 of the present application to achieve a full-duplex working mode.

The display module 20 may be multiple LED (light emitting diode) lights with the same or different colors. For example, this application uses three outputs, that is, a communication device is connected to three LED lights. It can be understood that, , The specific number can be selected according to needs, can be five. At the same time, the output pins can be arranged arbitrarily.

Please continue to refer to FIG. 2, the communication device 10 may further include a counting module 130. The counting module 130 is configured to receive and count the number of display modules 20 and the number of data bits transmitted, and generate 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 to count 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. The number of data bits is 40 bits, that is, the number of command data bits. When the entire communication device is in serial communication mode, the counting module 130 starts to count the number of display modules 20 and the number of data bits transmitted, and After the counting is completed, a latch signal is generated. The latch 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. The counting unit is configured to count the number of the display module 20 and the number of transmitted data bits. The display control unit 132 is configured to generate a latch signal after the counting is completed, that is, LE in FIG. 2. The display control unit 132 is further configured 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; input terminals of the bus data receiving shift register 140 are connected to a clock serial bus SCLK and a data serial bus, respectively. SDI; output termination decoding module 120; used to receive and store command data. The input end of the serial bus shift register 150 is connected to the clock serial bus SCLK and the data serial bus SDI respectively; the output end is connected to the input end of the multiplexer 110; and is 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 this description here is only for distinction. A shift register is a flip-flop-based device that operates under several identical time pulses. Data is input to the device in parallel or serially, and then each time pulse is sequentially left or right. Shift one bit and 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 to receive and store parameters; and is also used to configure a 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) 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 and is configured to store the number of the display modules 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 for storing the data bit number of the command data. In the present application, the parameter 1 and the parameter 2 in the command data are stored by setting the configuration register 160, which makes it unnecessary to repeatedly define the parameter 1 and the parameter 2 when connecting with other peripheral devices in the future, so that the display device of the present application It's 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 also LRGB [2], LRGB [1 in FIG. 2 ] And LRGB [0]. Among them, LRGB [2], LRGB [1], and LRGB [0] are the same type of cache register, 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 configured to receive a 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, and OC are the same type of conduction unit, and the descriptions here are 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 to maintain a constant output of the output current. Based on the characteristics of LED lights, constant current drive is required when driving LED lights for display. At the same time, in order to maintain more stable light emission of LED lights, it is also necessary to ensure constant current drive of LED lights.

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 and is used 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) cannot be set externally. The current configured in the current configuration register (not shown) is generally set by the manufacturer at the time of shipment. After setting the current adjustment module 190, the user can adjust the current output to the LED light according to his own needs.

Please continue to refer to FIG. 2, the communication device 10 may further include a crystal oscillator, and the crystal oscillator is connected to the decoding module 120 for providing an internal clock signal to the decoding module 120. The clock signal is output after being driven by the BUFF buffer. The cascaded communication device 10 receives the synchronization signal 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. The switching command can also be generated. Using the internal crystal oscillator clock sampling function, the external input clock can be canceled, that is, the clock serial bus SCLK. In this case, the communication device can use RS232 mode or PWM mode (duty cycle) to transmit, and the bus mode can also be realized. / Serial mode switch transmission. At this time, there is only one communication line used in the entire communication process, that is, the data serial bus SDI.

Based on the above, and combined with FIG. 2 and FIG. 4 at the same time, the principle of the display device is: 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 booting. 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, it internally sets BUSState = 0, and the bus mode / serial mode multiplexer MUX switches the SDO output to the output of the serial bus shift register 150 inSDI, communication The device 10 enters a serial reception state internally. When entering the serial bus communication state, the counting module 130 performs reception counting based on the number of cascaded communication devices 10 in the communication control link and the number of data bits (3 bits of data in this application) to be received by each communication device 10, After the data transmission to the entire communication control link cascade communication device 10 is completed, the latch signal LE is generated to output data to the buffer register 172, that is, LRGB2, LRGB1, and LRGB0 in FIG. 4. The synchronous operation of each cascade communication device 10 is realized. Further, before requesting the serial communication bus to send (ASKSend) command (CODE = 1), a plurality of different commands may be sent as required. In this application, a sending command (CODE = 0) is set to the configuration register 160. The current configuration register (not shown in the figure) generates WRCR pulses to configure and display the output current inside the device. After receiving the data to be communicated, the device generates DispBegin pulses to control the conduction unit 170 to output current according to the configured current. The constant current 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, so that the entire device Stop output current. After receiving the data, the communication device 10 sets the bus state BUSState = 1 internally, returns 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, and performs synchronous data transmission in the serial communication mode. During data transmission, it is controlled according to the output current value configured inside the communication device. The display module 20 performs display, and after the serial communication is completed, the circuit returns to the bus communication mode so as to receive commands and parameters again.

The technical features of the embodiments described above can be arbitrarily combined. In order to simplify the description, all possible combinations of the technical features in the above embodiments have not been described. However, as long as there is no contradiction in the combination of these technical features, It should be considered as the scope described in this specification.

The above-mentioned embodiments only express several implementation manners of the present invention, and their descriptions are more specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be noted that, for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent shall be subject to the appended claims.

Claims

A display device, wherein the display device includes:

A clock serial bus, configured to provide a clock synchronization signal for the communication control link;

A data serial bus for transmitting data to be communicated, wherein the data to be communicated includes serial communication data and 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, and the bus mode / serial mode multiplexer is used to switch between the bus communication mode and the serial communication mode; a plurality of the communications The device realizes synchronous transmission of the data to be communicated under the clock synchronization signal through the bus mode / serial mode multiplexer;

The communication device is further configured to receive the serial communication data and output a control signal according to the serial communication data to control the display module to perform display.
The display device according to claim 1, wherein the communication device further comprises a decoding module, wherein the decoding module is configured to decode the bus communication data in a bus communication mode to generate a predetermined number of data bits. Command data; wherein the command data is composed of a boot header, a command, and a parameter.
The display device according to claim 2, wherein the bus mode / serial mode multiplexer is further configured to receive the command data, and switch the communication device to a bus communication mode according to the command data. Switch to serial communication mode.
The display device according to claim 2, wherein the communication device further comprises a counting module, the counting module is configured to receive and count the number of the display module and the number of data bits transmitted, and A latch signal is generated after the count is completed.
The display device according to claim 4, wherein the bus mode / serial mode multiplexer is further configured to receive the latch signal, and switch the communication device from a serial port according to the latch signal. The line communication mode is switched to the bus communication mode.
The display device according to claim 2, wherein the communication device further comprises a bus data receiving shift register and a serial bus shift register;

An input end of the bus data receiving shift register is respectively connected to the clock serial bus and the data serial bus; an output end is connected to the decoding module; and used to receive and store the command data;

An input end of the serial bus shift register is respectively connected to the clock serial bus and the data serial bus; an output end is connected to an input end of the multiplexer; and is used to receive and store the data to be communicated. .
The display device according to claim 2, wherein the communication device further comprises a configuration register, the configuration register is connected to the decoding module, and is configured to receive and store the parameters; and is further configured to output to The current of the display module.
The display device according to claim 6, wherein the communication device further comprises an output control module connected between the serial bus shift register and the display module for controlling output to the display The output current of the module.
The display device according to claim 8, wherein the communication device further comprises a constant current module connected between the output control module and the display module, and configured to maintain a constant output of the output current.
The display device according to claim 9, wherein the communication device further comprises a current adjustment module, and the current adjustment module is connected to the constant current module for adjusting the current output by the constant current module.