CN114512089A - Display control circuit, display control method, display module and display device - Google Patents
Display control circuit, display control method, display module and display device Download PDFInfo
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- CN114512089A CN114512089A CN202011280411.2A CN202011280411A CN114512089A CN 114512089 A CN114512089 A CN 114512089A CN 202011280411 A CN202011280411 A CN 202011280411A CN 114512089 A CN114512089 A CN 114512089A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
Abstract
The disclosure relates to a display control circuit, a display control method, a display module and a display device. The circuit comprises: the receiving unit is used for receiving the data to be displayed sent by the host computer and converting the data into first transmission data to be output to the data management unit when the display control circuit is connected with the host computer; a data management unit to: receiving first transmitted data or data from a cascade input port; if the received data is the data of the scanning block, storing the data; otherwise, transmitting the data to a cascade output port; a scan control unit for generating a scan signal according to the data stored in the data management unit; and the display driving unit is used for driving the LED dot matrix corresponding to the scanning block to display according to the scanning signal. Therefore, the display control circuit can provide integrated control functions such as network communication, scanning control, display driving and the like, and has the characteristics of multiple functions, integration, high refreshing frequency and the like, so that the display device has the advantages of stable picture, optimized process, simple structure and lower cost.
Description
Technical Field
The disclosure relates to the field of LED display, in particular to a display control circuit, a display control method, a display module and a display device.
Background
Display devices (e.g., LED display panels) have matured considerably over several decades, and these years have LED to improved processes and increased pixel density to improve display performance. However, the display device has not been substantially changed in terms of its system configuration. For example, the synchronous LED display screen always maintains the ternary structure of the display module, the receiving card and the switching power supply, and this structure makes the manufacturing and installation of the synchronous LED display screen more complicated, specialized and engineered, and is prone to frequent failure. In addition, with the continuous reduction of the spacing between the LED dot matrixes, the number of microelectronic devices on the back of the display module is large, which makes the layout difficult. Also, the number of receiving cards and cables mounted behind the internal module of the housing is too large to handle. These are all important factors for the development of display devices at present.
In recent years, there have been few techniques or schemes for attempting circuit optimization for display modules, but no substantial changes have been made to the system architecture of the display device.
Disclosure of Invention
In order to overcome the problems in the related art, the present disclosure provides a display control circuit, a display control method, a display module and a display device.
In order to achieve the above object, in a first aspect, the present disclosure provides a display control circuit comprising:
the device comprises a receiving unit, a data management unit, a scanning control unit and a display driving unit;
the receiving unit is connected with the data management unit and used for receiving data to be displayed sent by a host when the display control circuit is connected with the host, converting the data to be displayed into first transmission data and outputting the first transmission data to the data management unit;
one end of the data management unit is used for being connected with the cascade input port, and the other end of the data management unit is used for being connected with the cascade output port and is used for: receiving the first transmission data output by the receiving unit or the data from the cascade input port; if the received data is the data of the scanning block, storing the received data; if the received data is not the data of the current scanning block, transmitting the received data to a cascade output port, wherein the cascade input port is used for being connected with a cascade output port of a display control circuit of a display module before the current display module, the cascade output port is used for being connected with a cascade input port of a display control circuit of a display module after the current display module, the current scanning block is a pixel space corresponding to the display control circuit, the current display module is a display module which belongs to the display control circuit in a display device, and the display device comprises one or more cascade display modules;
one end of the scanning control unit is connected with the data management unit, and the other end of the scanning control unit is connected with the display driving unit and used for generating a scanning signal according to the data stored in the data management unit and outputting the scanning signal to the display driving unit;
and the display driving unit is used for being connected with the LED dot matrix corresponding to the scanning block and driving the LED dot matrix corresponding to the scanning block to display according to the scanning signal.
Optionally, the data management unit includes a data control module, a memory, an input buffer, and an output buffer;
one end of the input buffer is used for being connected with the cascade input port, and the other end of the input buffer is connected with the data control module, and is used for buffering data output by the cascade input port and outputting the data to the data control module as second transmission data;
the data control module is respectively connected with the memory, the output buffer and the receiving unit, and is configured to: receiving the first transmission data output by the receiving unit or the second transmission data output by the input buffer; if the received data is the data of the scanning block, storing the received data to the memory; if the received data is not the data of the scanning block, outputting the received data to the output buffer;
and the output buffer is used for being connected with the cascade output port, buffering the data output by the data control module and outputting the data to the cascade output port.
Optionally, the display driving unit includes a decoder and a register;
one end of the decoder is connected with the scanning control unit, and the other end of the decoder is used for being connected with the line driving unit and decoding line numbers in the scanning signals to obtain line signals, and the line signals are output to the line driving unit so that the line driving unit generates line driving according to the line signals and outputs the line driving to the LED dot matrix corresponding to the scanning block;
and one end of the register is connected with the scanning control unit, and the other end of the register is used for being connected with the LED dot matrix corresponding to the scanning block and used for shifting, latching and outputting red, green and blue data in the scanning signal to the LED dot matrix corresponding to the scanning block.
Optionally, the display driving unit further comprises the row driving unit.
Optionally, the receiving unit includes a network control module;
the network control module is configured to receive data to be displayed sent by the host through a network communication module and convert the data to be displayed into first transmission data to output the first transmission data to the data management unit when the display control circuit is connected to the host, and the network communication module is configured to provide a communication receiving function of a physical layer for the network control module or provide a communication receiving function of a physical layer and a link layer for the network control module.
Optionally, the receiving unit further includes the network communication module.
Optionally, when the display driving unit includes the decoder and the register, the network control module, the data management unit, the scan control unit, and the decoder are integrated into a field programmable gate array chip;
the field programmable gate array chip is used for being connected with a configuration chip, and the configuration chip is used for storing and loading programs of the field programmable gate array chip.
Optionally, when the display driving unit includes the decoder and the register, the network control module, the data control module, the input buffer, the output buffer, the scan control unit, and the decoder are integrated into one or more complex programmable logic device chips.
Optionally, the display control circuit is integrated into one or more integrated circuits.
In a second aspect, the present disclosure provides a display control method applied to a display control circuit, where the display control circuit includes: the device comprises a receiving unit, a data management unit, a scanning control unit and a display driving unit; the receiving unit is connected with the data management unit; one end of the data management unit is used for being connected with a cascade input port, the other end of the data management unit is used for being connected with a cascade output port, the cascade input port is used for being connected with a cascade output port of a display control circuit of a display module before the current display module, and the cascade output port is used for being connected with a cascade input port of a display control circuit of a display module after the current display module; one end of the scanning control unit is connected with the data management unit, and the other end of the scanning control unit is connected with the display driving unit; the display driving unit is used for being connected with the LED dot matrix corresponding to the scanning block; the current display module is a display module which is included in a display device and the display control circuit, and the display device comprises one or more cascaded display modules;
the method comprises the following steps:
when the display control circuit is connected with a host, the receiving unit receives data to be displayed sent by the host, converts the data to be displayed into first transmission data and outputs the first transmission data to the data management unit;
the data management unit receives the first transmission data output by the receiving unit or the data from the cascade input port, stores the received data if the received data is the data of a local scanning block, and transmits the received data to the cascade output port if the received data is not the data of the local scanning block, wherein the local scanning block is a pixel space corresponding to the display control circuit;
the scanning control unit generates a scanning signal according to the data stored in the data management unit and outputs the scanning signal to the display driving unit;
and the display driving unit drives the LED dot matrix corresponding to the scanning block to display according to the scanning signal.
In a third aspect, the present disclosure provides a display module, including:
the LED scanning device comprises a cascade input port, a cascade output port, a display control circuit and an LED dot matrix corresponding to a scanning block, wherein the scanning block is a pixel space corresponding to the display control circuit;
the display control circuit is the display control circuit provided by the first aspect of the present disclosure.
In a fourth aspect, the present disclosure provides a display device, including a switching power supply, further including: a display module assembly or a plurality of cascaded display module assemblies, wherein, the display module assembly is that this third aspect of the disclosure provides the display module assembly.
In the above technical solution, the display control circuit includes a receiving unit, a data management unit, a scanning control unit, and a display driving unit. When the display control circuit is connected with the host, the receiving unit receives data to be displayed sent by the host, converts the data to be displayed into first transmission data and outputs the first transmission data to the data management unit; the data management unit receives the first transmission data output by the receiving unit or the data from the cascade input port, stores the received data if the received data is the data of the scanning block, and transmits the received data to the cascade output port if the received data is not the data of the scanning block; the scanning control unit generates a scanning signal according to the data stored in the data management unit and outputs the scanning signal to the display driving unit; and the display driving unit drives the LED dot matrix corresponding to the scanning block to display according to the scanning signal. Therefore, the display control circuit can realize the functions of all main devices except the LED dot matrix in the receiving card and the display module in the existing display device, the structure of the display module is optimized, the receiving card is omitted, and the display device structure is simplified into two parts, namely the display module and the switch power supply, from the three parts, namely the display module, the receiving card and the switch power supply. Moreover, a single display control circuit can control one display module, the single display module can be combined with a switching power supply to form a display device, and the display device with a given size can be realized by a plurality of display modules through simple cascade connection. Therefore, the display control circuit provided by the disclosure can provide integrated control functions such as network communication, scanning control and display driving for the display device, has the characteristics of multifunction, integration, high refresh frequency and the like, and enables the display device to have the advantages of stable picture, optimized process, concise structure, lower cost and the like.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a schematic structural diagram of a display module according to an exemplary embodiment.
Fig. 2 is a schematic structural diagram of a display module according to another exemplary embodiment.
Fig. 3 is a schematic structural diagram of a display module according to another exemplary embodiment.
Fig. 4 is a schematic structural diagram of a display module according to another exemplary embodiment.
Fig. 5 is a schematic structural diagram illustrating a display module according to another exemplary embodiment.
Fig. 6 is a schematic structural diagram of a display module according to another exemplary embodiment.
Fig. 7 is a flowchart illustrating a display control method according to an exemplary embodiment.
Description of the reference numerals
1 receiving unit 2 data management unit
3 scan control unit 4 display drive unit
5 cascade input port 6 cascade output port
10 display control circuit 7 and the LED lattice corresponding to the scanning block
8 network input port 9 configuration chip
11 network control module 12 network communication module
21 data control module 22 memory
23 input buffer 24 output buffer
41 decoder 42 register
43-row driver unit 100 JTAG interface
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Before describing embodiments of the present disclosure in detail, some terms used in the present disclosure are first defined or explained. It is to be understood that such terms are used merely for convenience of description and understanding, and are not intended to limit the present disclosure.
Chip (chip): one way in electronics to miniaturize circuits (including primarily semiconductor devices, including passive components, etc.) and, oftentimes, to fabricate on the surface of a semiconductor wafer is an essential element of integrated circuits.
Element (component): electronic components (electronic components), which are essential elements in electronic circuits, are usually individually packaged and have two or more leads or metal contacts. In this specification, "element" is used to particularly designate a discrete device such as a resistor, a capacitor, an inductor, a transistor, a diode, an oscillator, or the like.
Integrated circuit (integrated circuit): abbreviated as "IC" is a microelectronic device or component. The transistor, the resistor, the capacitor, the inductor and other elements and wires required in a circuit are interconnected together by adopting a certain process, are manufactured on a small or a plurality of small semiconductor wafers or medium substrates, and are then packaged in a tube shell to form a micro structure with the required circuit function; wherein all elements have been structurally integrated. In this specification, "integrated circuit" refers to an integrated circuit which is integrated and uniformly packaged by a chip, or an integrated circuit which is integrated and uniformly packaged by a chip and a component.
Circuit (circuit): in this specification, the term "electronic circuit" refers to a circuit/network of chips and/or electronic devices/components and interconnecting wires.
Logic circuit (logic circuit): the circuit is a circuit which is used for transmitting and processing discrete signals and realizes the logical operation and operation of digital signals by using a binary system as a principle. A sub-combinational logic circuit and a sequential logic circuit. The former is composed of the most basic 'AND' gate 'circuit, the' OR 'gate' circuit and the 'NOT' circuit, the output value of the former only depends on the current value of the input variable, and is irrelevant to the past value of the input variable, namely, the former has no memory and storage function; the latter is also composed of the basic logic gate circuit described above, but there is a feedback loop whose output value depends not only on the current value of the input variable, but also on the past value of the input variable. Because only high and low levels are separated, the interference resistance is strong, and the precision and the confidentiality are good. The method is widely applied to the aspects of computers, digital control, communication, automation, instruments and the like. The most basic are AND circuits, OR circuits and NOT circuits. A logic chip refers to a chip containing only logic circuits.
Module (module): circuit modules (circuits) are referred to herein, and refer to circuits or circuit portions that are functionally and structurally independent.
LED display screen (LED display): the display screen is generally a display screen composed of an array of LED devices in a certain control manner, and in this specification, mainly a synchronous LED display screen. The synchronous LED display screen refers to an LED display screen which synchronously displays (is synchronous to VGA) with a display of a computer (namely a host).
The display module assembly: also known as a module, refers to an independent unit which is determined by a circuit and a mounting structure and has a display function and constitutes the LED display screen.
A screen body: the LED screen is also called a display screen body, and the whole LED screen is formed by splicing a module and a power supply and control unit thereof in an array manner, wherein a remote control device and a computer are not included.
Receiving a card: conventional synchronous LED display screens use custom gigabit ethernet to transmit data, wherein the device for receiving ethernet data and controlling the LED display is called a "receiving card" (also called a "scan board"). Some receiving cards in the early days were designed as two parts, namely a receiving card and an adapter card, and most of the receiving cards were integrated later. In the present specification, "receiving card" broadly refers to these two ways.
The scanning mode is as follows: the LED display screen adopts an interlaced scanning mode, and if scanning is performed at intervals of N lines, the scanning mode is 1/N scanning.
Gray value: the RGB color level dynamic display method refers to a specific RGB color level numerical value dynamically representing the brightness of LED pixel colors.
And (3) data transmission: in this specification, display data of an additional control signal for cascade transmission is referred to as "transmission data", which mainly includes: display data, scan block number, and control signals (enable signals, etc.).
And (3) displaying data: refers to specific RGB gray scale values.
Scanning generation: the method refers to a process of converting display data representing gray values into a plurality of scans in a duty cycle manner, wherein each scan generates a set of scan signals.
Scanning signals: in this specification, a signal group resulting from the scan generation capable of further generating row driving and shift latch data to make the LED dot matrix normally display is referred to as a "scan signal". The scanning signal mainly includes: data-driven clock (SLK), line Enable (ECL), red, green, blue data, and line number (A, B, C, ·. Wherein, the red, green and blue data are bit data of three primary colors of red, green and blue in one scanning.
Scanning time sequence: in this specification, a timing waveform generated during execution of a scan signal is referred to as a scan timing.
Scanning time sequence mode: in this specification, the conditions and rules on which the scan timing is generated mainly include: data driving clock (period, duty cycle), scan block width (number of columns), scan block height (number of rows), scan mode, gray scale level, refresh frequency, and the like.
Gray scale: the number of the color levels (primary color levels) of the LED display screen with different changes between the darkest color and the brightest color is the capacity of distinguishing the bright level and the dark level of the LED display screen. Generally, display data output by a computer DVI is 8 bits each of RGB, that is, 256 gradations each of RGB. When the LED scanning is specifically designed, the gray scale can be improved by methods such as interpolation.
Refresh frequency: the number of times each second of the display data is repeated by the LED display screen.
In one embodiment, the display device includes a switching power supply and a display module.
In another embodiment, the display device comprises a switching power supply and a plurality of cascaded display modules.
As shown in fig. 1, the display module includes a cascade input port 5, a cascade output port 6, a display control circuit 10, and an LED dot matrix 7 corresponding to the scanning block, where the scanning block is a pixel space corresponding to the display control circuit 10. In order to simplify the structure of the display module, the display control circuit 10 may be integrated into one or more integrated circuits.
In the present disclosure, the cascade input port 5 is used for being connected with a cascade output port of a display control circuit of a display module before the current display module, the cascade output port 6 is used for being connected with a cascade input port of a display control circuit of a display module after the current display module, and the current display module is a display module belonging to the display control circuit in the display device.
Exemplarily, as shown in fig. 2, the cascade input port of the current display module N is connected to the cascade output port of the display control circuit of the previous display module N-1, and the cascade output port of the current display module N is connected to the cascade input port of the display control circuit of the next display module N + 1.
As shown in fig. 1 to 6, the display control circuit 10 includes a receiving unit 1, a data management unit 2, a scan control unit 3, and a display driving unit 4.
The receiving unit 1 is connected to the data management unit 2, and is configured to receive data to be displayed sent by the host, convert the data to be displayed into first transmission data, and output the first transmission data to the data management unit 2 when the display control circuit 10 is connected to the host, that is, the display module to which the current display control circuit 10 belongs is a first display module of the plurality of cascaded display modules of the display device. Only one display module (specifically, a display control circuit in the display module) in the display device is connected with the host, and at this time, a receiving unit of the display control circuit in the display module is in an enabling state and is used for receiving data to be displayed (including the data to be displayed corresponding to each display module in the display device) sent by the host; the receiving units of the display control circuits in the other display modules in the display device are not connected with the host and are in a non-enabled state.
One end of the data management unit 2 is used for being connected with the cascade input port 5, and the other end of the data management unit is used for being connected with the cascade output port 6, and is used for: receiving first transmission data output by the receiving unit 1 or data from a cascade input port 5; if the received data is the data of the scanning block, storing the received data; and if the received data is not the data of the scanning block, transmitting the received data to the cascade output port 6.
In the present disclosure, if the receiving unit 1 of the current display control circuit 10 is in an enabled state, the data management unit 2 is configured to receive the first transmission data output by the receiving unit 1; if the receiving unit 1 of the current display control circuit 10 is in the disabled state, the data management unit 2 is configured to receive data from the cascade input port 5, where the cascade input port 5 receives data from a cascade output port of a display module that is previous to the current display module.
The data management unit 2 receives the first transmission data output from the reception unit 1 or the data from the cascade input port 5, and then determines whether the received data is data of the current scan block.
Specifically, the transmission data may carry a scan block number, which is an identifier of a scan block to which the transmission data belongs. Therefore, whether the received data is the data of the scanning block can be judged through the scanning block number carried by the received data. If the number of the scanning block carried by the received data is the same as the number of the scanning block corresponding to the current display control circuit, determining the received data as the data of the scanning block; and if the scanning block number carried by the received data is different from the scanning block number corresponding to the current display control circuit, determining that the received data is not the data of the scanning block. The display control circuit may be provided with a dial switch outside for displaying the scan block number of the corresponding display control circuit, so that the data management unit 2 may obtain the scan block number of the current display control circuit through the dial switch.
If the received data is the data of the scanning block, storing the received data; if the received data is not the data of the scanning block, the received data is transmitted to the next display module of the current display module, namely the received data is transmitted to the cascade output port 6 so as to be transmitted to the cascade input port of the display control circuit of the next display module of the current display module through the cascade output port 6.
As shown in fig. 1 to 6, the scan control unit 3 has one end connected to the data management unit 2 and the other end connected to the display driving unit 4, and is configured to generate a scan signal according to the data stored in the data management unit 2 and output the scan signal to the display driving unit 4. Specifically, the scan control unit 3 may generate scan information line by line and dot by reading and processing data in the data management unit 2 in a predetermined scan timing manner, and output to the display driving unit 4.
Illustratively, the scan control unit 3 may be a logic circuit/chip.
And the display driving unit 4 is used for connecting with the LED dot matrix corresponding to the scanning block and driving the LED dot matrix corresponding to the scanning block to display according to the scanning signal.
In the foregoing embodiment, in the process of transmitting data step by step between a plurality of cascaded display modules (specifically, display control circuits of the display modules) that display data, the scan control unit and the display driving unit of the target circuit can perform data refreshing display at the same time, that is, pipeline operation can be implemented, where the target circuit is a display control circuit that receives data of the scan block, and each display module of the display device can perform data refreshing display in parallel, so as to greatly increase the refreshing frequency of the display device.
In the above technical solution, the display control circuit includes a receiving unit, a data management unit, a scanning control unit, and a display driving unit. When the display control circuit is connected with the host computer, the receiving unit receives data to be displayed sent by the host computer, converts the data to be displayed into first transmission data and outputs the first transmission data to the data management unit; the data management unit receives the first transmission data output by the receiving unit or the data from the cascade input port, stores the received data if the received data is the data of the scanning block, and transmits the received data to the cascade output port if the received data is not the data of the scanning block; the scanning control unit generates a scanning signal according to the data stored in the data management unit and outputs the scanning signal to the display driving unit; and the display driving unit drives the LED dot matrix corresponding to the scanning block to display according to the scanning signal. Therefore, the display control circuit can realize the functions of all main devices except the LED dot matrix in the receiving card and the display module in the existing display device, the structure of the display module is optimized, the receiving card is omitted, and the display device structure is simplified into two parts, namely the display module and the switch power supply, from the three parts, namely the display module, the receiving card and the switch power supply. Moreover, a single display control circuit can control one display module, the single display module can be combined with a switching power supply to form a display device, and the display device with a given size can be realized by a plurality of display modules through simple cascade connection. Therefore, the display control circuit provided by the disclosure can provide integrated control functions such as network communication, scanning control and display driving for the display device, has the characteristics of multifunction, integration, high refresh frequency and the like, and enables the display device to have the advantages of stable picture, optimized process, concise structure, lower cost and the like.
In addition, the receiving unit 1 has various configurations. In one embodiment, as shown in fig. 3 to 5, the receiving unit 1 includes a network control module 11, configured to receive data to be displayed sent by a host via a network communication module 12 when a display control circuit 10 to which the network control module 11 belongs is connected to the host (where the network control module 11 may be connected to the host via the network communication module 12 (the host is not shown in the figure)), and convert the data to be displayed into first transmission data to be output to the data management unit 2. The network communication module 12 is configured to provide a physical layer communication receiving function for the network control module 11, or provide a physical layer and a link layer communication receiving function for the network control module 11. Illustratively, the network control module 11 may be a logic circuit/chip, and the network communication module 12 may be a network interface circuit/chip.
In the present disclosure, the type and communication mode of the network communication module 12 (corresponding to the connection mode of the display control circuit 10 and the host) are not limited, and the type of the network communication module 12 may be a wired type or a wireless type. Illustratively, the network communication module 12 may be a 5G communication module.
For example, for the ethernet mode, the network communication module 12 may include a Media Access Control (MAC) and a Physical interface transceiver (PHY). The MAC and the PHY may be independently configured, or may be integrated into one chip (that is, the network communication module 12 is an ethernet interface circuit/chip combining the MAC and the PHY).
Preferably, the MAC and PHY may be integrated into one chip, so that the structure of the network communication module 12 may be simplified and space may be saved.
In another embodiment, as shown in fig. 6, the receiving unit 1 includes a network control module 11 and a network communication module 12, i.e. the network communication module 12 is integrated in the display control circuit 10, so that the number of components of the display module can be reduced, and the structure of the display module can be simplified. The network control module 11 is configured to, when the display control circuit 10 is connected to a host (specifically, in a wired network manner, the network control module 11 is connected to the host sequentially through the network communication module 12 and the network input port 8), receive data to be displayed sent by the host through the network communication module 12, convert the data to be displayed into first transmission data, and output the first transmission data to the data management unit 2. The network communication module 12 is configured to provide a physical layer communication receiving function for the network control module 11, or provide a physical layer and a link layer communication receiving function for the network control module 11.
The network input port 8 may include an RJ45 interface and a network transformer in an ethernet manner. The RJ45 interface and the network transformer may be set independently, or may be integrated into an RJ45 interface with transformer.
As shown in fig. 3 to 6, the data management unit 2 includes a data control module 21, a memory 22, an input buffer 23, and an output buffer 24.
The input buffer 23 has one end connected to the cascade input port 5 and the other end connected to the data control module 21, and is configured to buffer data output from the cascade input port 5 and output the buffered data to the data control module 21 as second transmission data.
The data control module 21 is connected to the memory 22, the output buffer 23, and the receiving unit 1, respectively, and is configured to: receiving the first transmission data outputted by the receiving unit 1 or the second transmission data outputted by the input buffer 23; if the received data is the data of the scanning block, the received data is stored in the memory 22; if the received data is not the data of the local scan block, the received data is output to the output buffer 24.
And the output buffer 24 is used for being connected with the cascade output port 6, buffering the data output by the data control module 21, and outputting the data to the cascade output port 6.
Illustratively, the data control module 21 is a logic circuit/chip; the memory 22 may be an SRAM circuit/chip; the input buffer 23, the output buffer 24 may be a buffer/transceiver circuit/chip.
In addition, the display driving unit 4 described above includes various structures. In one embodiment, as shown in fig. 4 and 6, the display driving unit 4 includes a decoder 41 and a register 42.
The decoder 41 has one end connected to the scan control unit 3 and the other end connected to the row driving unit 43, and is configured to decode a row number in the scan signal to obtain a row signal, and output the row signal to the row driving unit 43, so that the row driving unit 43 generates row driving according to the row signal and outputs the row driving to the LED dot matrix corresponding to the scan block.
And one end of the register 42 is connected with the scanning control unit 3, and the other end of the register is used for being connected with the LED dot matrix corresponding to the scanning block and used for shifting, latching and outputting red, green and blue data in the scanning signal to the LED dot matrix corresponding to the scanning block.
Illustratively, the decoder 41 may be a decoder circuit/chip, the register 42 may be a serial-in and parallel-out shift register circuit/chip, and the row driving module 43 may be a multi-path constant voltage/constant current driving circuit/chip.
The row driving module 43 may be composed of any one of a triode, a darlington transistor, and a Metal-Oxide-Semiconductor (MOS transistor), that is, the structure of the row driving module 43 may have the following three types: first, the row driving module 43 is composed of a plurality of triodes; second, the row driver module 43 is composed of a plurality of darlington tubes; thirdly, the row driving module 43 is composed of a plurality of MOS transistors.
In another embodiment, as shown in fig. 5, the display driving unit 4 includes a decoder 41, a register 42, and a row driving unit 43. The column driving unit 43 is integrated into the display control circuit 10, so as to further reduce the number of elements of the display module, simplify the structure of the display module, and facilitate the assembly of the display device.
The above technical solution provides a basic technical architecture of the display control circuit 10, and on this basis, the display control circuit 10 may also appropriately incorporate internal modules and further integrate other necessary functional modules or elements. In an embodiment, when the display driving unit includes a decoder 41 and a register 42, as shown in fig. 6, the network control module 11, the data management unit 2, the scan control unit 3, and the decoder 41 may be integrated into a Field Programmable Gate Array (FPGA) chip, where the FPGA chip is used to connect with the configuration chip 9, where the configuration chip 9 is used to store and load a program of the FPGA chip, and as shown in fig. 6, a Joint Test Action Group (JTAG) interface may be provided on the configuration chip 9, so that a user may modify the program of the FPGA chip. The register 42 needs to drive the LED array, and the working current is large, and is not suitable for being embedded in the FPGA chip, so the network control module 11, the data management unit 2, the scan control unit 3, and the decoder 41 can be integrated into one FPGA chip, which is more convenient for implementing the display control circuit 10.
The configuration chip 9 may be disposed outside the display control circuit 10 (as shown in fig. 6), or may be integrated into the display control circuit 10. Preferably, the configuration chip 9 can be integrated into the display control circuit 10 to further reduce the number of display module components and simplify the structure of the display module.
In another embodiment, when the data management unit 2 includes the data control module 21, the memory 22, the input buffer 23 and the output buffer 24, and the display driving unit 4 includes the decoder 41 and the register 42, the network control module 11, the data control module 21, the input buffer 23, the output buffer 24, the scan control unit 3 and the decoder 41 may be integrated into a Complex Programmable Logic Device (CPLD) chip. The network control module 11, the data control module 21, the input buffer 23, the output buffer 24, the scan control unit 3, and the decoder 41 may be implemented by one or more CPLD chips, that is, the network control module 11, the data control module 21, the input buffer 23, the output buffer 24, the scan control unit 3, and the decoder 41 may be integrated into one or more CPLD chips. Illustratively, the network control module 11 and the data control module 21 are integrated into one CPLD chip; the input buffer 23, the output buffer 24, the scan control unit 3, and the decoder 41 are integrated into one CPLD chip. The CPLD chip does not need to be configured with a chip, has high running speed and is lower in cost than the FPGA chip.
The present disclosure also provides a display control method applied to a display control circuit, wherein the display control circuit includes: the device comprises a receiving unit, a data management unit, a scanning control unit and a display driving unit; the receiving unit is connected with the data management unit; the data management unit is used for connecting one end of the data management unit with the cascade input port and the cascade output port, the cascade input port is used for being connected with the cascade output port of the display control circuit of the display module before the current display module, and the cascade output port is used for being connected with the cascade input port of the display control circuit of the display module after the current display module; one end of the scanning control unit is connected with the data management unit, and the other end of the scanning control unit is connected with the display driving unit; the display driving unit is used for being connected with the LED dot matrix corresponding to the scanning block; the current display module is a display module of the display device and the display control circuit, and the display device comprises one or more cascaded display modules.
As shown in fig. 7, the display control method includes S701 to S704.
In S701, when the display control circuit is connected to the host, the receiving unit receives data to be displayed sent by the host, converts the data to be displayed into first transmission data, and outputs the first transmission data to the data management unit.
In S702, the data management unit receives the first transmission data output by the receiving unit or the data from the cascade input port, stores the received data if the received data is the data of the local scanning block, and transmits the received data to the cascade output port if the received data is not the data of the local scanning block, where the local scanning block is a pixel space corresponding to the display control circuit.
In S703, the scan control unit generates a scan signal from the data stored in the data management unit and outputs the scan signal to the display driving unit.
In S704, the display driving unit drives the LED dot matrix corresponding to the scanning block to display according to the scanning signal.
In the above technical solution, the display control circuit includes a receiving unit, a data management unit, a scanning control unit, and a display driving unit. When the display control circuit is connected with the host, the receiving unit receives data to be displayed sent by the host, converts the data to be displayed into first transmission data and outputs the first transmission data to the data management unit; the data management unit receives the first transmission data output by the receiving unit or the data from the cascade input port, stores the received data if the received data is the data of the scanning block, and transmits the received data to the cascade output port if the received data is not the data of the scanning block; the scanning control unit generates a scanning signal according to the data stored in the data management unit and outputs the scanning signal to the display driving unit; and the display driving unit drives the LED dot matrix corresponding to the scanning block to display according to the scanning signal. Therefore, the display control circuit can realize the functions of all main devices except the LED dot matrix in the receiving card and the display module in the existing display device, the structure of the display module is optimized, the receiving card is omitted, and the display device structure is simplified into two parts, namely the display module and the switch power supply, from the three parts, namely the display module, the receiving card and the switch power supply. Moreover, a single display control circuit can control one display module, the single display module can be combined with a switching power supply to form a display device, and the display device with a given size can be realized by a plurality of display modules through simple cascade connection. Therefore, the display control circuit provided by the disclosure can provide integrated control functions such as network communication, scanning control and display driving for the display device, has the characteristics of multifunction, integration, high refresh frequency and the like, and enables the display device to have the advantages of stable picture, optimized process, concise structure, lower cost and the like.
Optionally, the data management unit includes a data control module, a memory, an input buffer, and an output buffer; one end of the input buffer is used for being connected with the cascade input port, and the other end of the input buffer is connected with the data control module; the data control module is respectively connected with the memory, the output buffer and the receiving unit; the output buffer is used for being connected with the cascade output port;
the data management unit receives the first transmission data output by the receiving unit or the data from the cascade input port, stores the received data if the received data is the data of the local scanning block, and transmits the received data to the cascade output port if the received data is not the data of the local scanning block, including:
the input buffer caches the data output by the cascade input port and outputs the data to the data control module as second transmission data;
the data control module receives the first transmission data output by the receiving unit or the second transmission data output by the input buffer; if the received data is the data of the scanning block, storing the received data to the memory; if the received data is not the data of the scanning block, outputting the received data to the output buffer;
and the output buffer caches the data output by the data control module and outputs the data to the cascade output port.
Optionally, the display driving unit includes a decoder and a register; one end of the decoder is connected with the scanning control unit, and the other end of the decoder is used for being connected with the row driving unit; and one end of the register is connected with the scanning control unit, and the other end of the register is used for being connected with the LED dot matrix corresponding to the scanning block.
The display driving unit drives the LED dot matrix corresponding to the scanning block to display according to the scanning signal, and the display driving unit comprises:
the decoder decodes the line numbers in the scanning signals to obtain line signals, and outputs the line signals to the line driving unit, so that the line driving unit generates line driving according to the line signals and outputs the line driving to the LED dot matrix corresponding to the scanning block;
and the register shifts and latches the red, green and blue data in the scanning signals and outputs the red, green and blue data to the LED dot matrix corresponding to the scanning block.
Optionally, the display driving unit further comprises the row driving unit.
Optionally, the receiving unit includes a network control module;
when the display control circuit is connected with a host, the receiving unit receives data to be displayed sent by the host, converts the data to be displayed into first transmission data and outputs the first transmission data to the data management unit, and the method comprises the following steps:
when the display control circuit is connected with the host computer, the network control module receives data to be displayed sent by the host computer through the network communication module, converts the data to be displayed into first transmission data and outputs the first transmission data to the data management unit, wherein the network communication module is used for providing a communication receiving function of a physical layer for the network control module or providing a communication receiving function of a physical layer and a link layer for the network control module.
Optionally, the receiving unit further includes the network communication module.
Optionally, the network control module, the data management unit, the scan control unit, and the decoder are integrated into a field programmable gate array chip; the field programmable gate array chip is used for being connected with a configuration chip, and the configuration chip is used for storing and loading programs of the field programmable gate array chip.
Optionally, when the data management unit includes the data control module, the memory, the input buffer, and the output buffer, the network control module, the data control module, the input buffer, the output buffer, the scan control unit, and the decoder are integrated into one or more complex programmable logic device chips.
Optionally, the display control circuit is integrated into one or more integrated circuits.
The chip can be a single chip or a plurality of single chips. The single chip can be a newly designed ASIC chip, or an existing chip (such as a memory chip, a register chip, a buffer chip, a network communication chip, a constant current/constant voltage driving chip, an FPGA chip, a configuration chip, a CPLD chip, etc.). The element may be a separate element (such as a resistor, a capacitor, a crystal oscillator, etc.) in a peripheral circuit associated with each module in the display control circuit.
With regard to the method in the above-described embodiment, the specific manner in which each step performs an operation has been described in detail in the embodiment related to the display control circuit, and will not be elaborated here.
In addition, terms used in the embodiments of the present disclosure, examples of the terms include "network control module", "data management unit", "scan control unit", "display driving unit", "data control module", "decoder", "memory", "register module", "input buffer", "output buffer", "network communication module", "cascade input port", "cascade output port", "line driving module", "FPGA chip", "CPLD chip", "configuration chip", "JTAG interface", "network input port", "line driving", cascade "," scan clock "," enable "," RGB "," line number "," ethernet "," gigabit ethernet "," network communication "," PHY "," MAC "," interface circuit "," interface chip "," data reception "," data conversion "," logic circuit ", and the like, "SRAM", "buffer", "transceiver", "shift register", "constant current drive", "constant voltage drive", "driver circuit", "transistor", "darlington transistor", "MOS transistor", etc., are used for convenience of description only and do not constitute a limitation of the present disclosure.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. To avoid unnecessary repetition, the disclosure does not separately describe various possible combinations.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. A display control circuit, comprising:
a receiving unit (1), a data management unit (2), a scanning control unit (3) and a display driving unit (4);
the receiving unit (1) is connected with the data management unit (2) and is used for receiving data to be displayed sent by a host when the display control circuit is connected with the host, converting the data to be displayed into first transmission data and outputting the first transmission data to the data management unit (2);
one end of the data management unit (2) is used for being connected with the cascade input port (5), and the other end of the data management unit is used for being connected with the cascade output port (6) and is used for: receiving the first transmission data output by the receiving unit (1) or data from the cascade input port (5); if the received data is the data of the scanning block, storing the received data; if the received data is not the data of the scanning block, transmitting the received data to the cascade output port (6), wherein the cascade input port (5) is used for being connected with a cascade output port of a display control circuit of a display module before the current display module, the cascade output port (6) is used for being connected with a cascade input port of a display control circuit of a display module after the current display module, the scanning block is a pixel space corresponding to the display control circuit, the current display module is a display module in a display device and to which the display control circuit belongs, and the display device comprises one or more cascade display modules;
one end of the scanning control unit (3) is connected with the data management unit (2), and the other end of the scanning control unit is connected with the display driving unit (4), and is used for generating a scanning signal according to the data stored in the data management unit (2) and outputting the scanning signal to the display driving unit (4);
and the display driving unit (4) is used for being connected with the LED dot matrix corresponding to the scanning block and driving the LED dot matrix corresponding to the scanning block to display according to the scanning signal.
2. A circuit according to claim 1, characterized in that the data management unit (2) comprises a data control module (21), a memory (22), an input buffer (23) and an output buffer (24);
one end of the input buffer (23) is used for being connected with the cascade input port (5), and the other end of the input buffer is connected with the data control module (21), and is used for buffering data output by the cascade input port (5) and outputting the data to the data control module (21) as second transmission data;
the data control module (21) is respectively connected with the memory (22), the output buffer (23) and the receiving unit (1) and is used for: receiving the first transmission data output by the receiving unit (1) or the second transmission data output by the input buffer (23); if the received data is the data of the scanning block, storing the received data in the memory (22); if the received data is not the data of the scanning block, outputting the received data to the output buffer (24);
and the output buffer (24) is connected with the cascade output port (6), and is used for buffering the data output by the data control module (21) and outputting the data to the cascade output port (6).
3. A circuit according to claim 2, wherein the display driving unit (4) comprises a decoder (41) and a register (42);
one end of the decoder (41) is connected with the scanning control unit (3), and the other end of the decoder is used for being connected with a row driving unit (43) and decoding a row number in the scanning signal to obtain a row signal, and outputting the row signal to the row driving unit (43), so that the row driving unit (43) generates row driving according to the row signal and outputs the row driving to an LED dot matrix corresponding to the scanning block;
and one end of the register (42) is connected with the scanning control unit (3), and the other end of the register is used for being connected with the LED dot matrix corresponding to the scanning block and used for shifting, latching and outputting red, green and blue data in the scanning signal to the LED dot matrix corresponding to the scanning block.
4. A circuit as claimed in claim 3, characterized in that the display drive unit (4) further comprises the row drive unit (43).
5. The circuit according to any of claims 1 to 4, characterized in that the receiving unit (1) comprises a network control module (11);
the network control module (11) is configured to receive data to be displayed sent by the host through a network communication module (12) when the display control circuit is connected to the host, convert the data to be displayed into first transmission data, and output the first transmission data to the data management unit (2), where the network communication module (12) is configured to provide a communication receiving function of a physical layer for the network control module (11), or provide a communication receiving function of the physical layer and a link layer for the network control module (11).
6. The circuit according to claim 5, characterized in that the receiving unit (1) further comprises the network communication module (12).
7. The circuit according to claim 5, characterized in that, when the display driving unit (4) comprises the decoder (41) and the register (42), the network control module (11), the data management unit (2), the scan control unit (3), and the decoder (41) are integrated as a field programmable gate array chip;
the field programmable gate array chip is used for being connected with a configuration chip, and the configuration chip is used for storing and loading programs of the field programmable gate array chip.
8. A display control method is applied to a display control circuit, and is characterized in that the display control circuit comprises: the device comprises a receiving unit, a data management unit, a scanning control unit and a display driving unit; the receiving unit is connected with the data management unit; one end of the data management unit is used for being connected with a cascade input port, the other end of the data management unit is used for being connected with a cascade output port, the cascade input port is used for being connected with a cascade output port of a display control circuit of a display module before the current display module, and the cascade output port is used for being connected with a cascade input port of a display control circuit of a display module after the current display module; one end of the scanning control unit is connected with the data management unit, and the other end of the scanning control unit is connected with the display driving unit; the display driving unit is used for being connected with the LED dot matrix corresponding to the scanning block; the current display module is a display module which is included in a display device and the display control circuit, and the display device comprises one or more cascaded display modules;
the method comprises the following steps:
when the display control circuit is connected with a host, the receiving unit receives data to be displayed sent by the host, converts the data to be displayed into first transmission data and outputs the first transmission data to the data management unit;
the data management unit receives the first transmission data output by the receiving unit or the data from the cascade input port, stores the received data if the received data is the data of a local scanning block, and transmits the received data to the cascade output port if the received data is not the data of the local scanning block, wherein the local scanning block is a pixel space corresponding to the display control circuit;
the scanning control unit generates a scanning signal according to the data stored in the data management unit and outputs the scanning signal to the display driving unit;
and the display driving unit drives the LED dot matrix corresponding to the scanning block to display according to the scanning signal.
9. A display module, comprising:
the LED scanning device comprises a cascade input port, a cascade output port, a display control circuit and an LED dot matrix corresponding to a scanning block, wherein the scanning block is a pixel space corresponding to the display control circuit;
the display control circuit according to any one of claims 1 to 7.
10. A display device includes a switching power supply, and is characterized by further including: a display module or a plurality of cascaded display modules, wherein, the display module is according to claim 9.
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Application publication date: 20220517 |