CN115134551A - Double-screen display method based on LVDS (Low Voltage differential Signaling) interface, controller and electronic equipment - Google Patents

Double-screen display method based on LVDS (Low Voltage differential Signaling) interface, controller and electronic equipment Download PDF

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Publication number
CN115134551A
CN115134551A CN202110331072.4A CN202110331072A CN115134551A CN 115134551 A CN115134551 A CN 115134551A CN 202110331072 A CN202110331072 A CN 202110331072A CN 115134551 A CN115134551 A CN 115134551A
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display
display data
data
screen
channel
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马海斌
方名康
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Actions Technology Co Ltd
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Actions Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/765—Interface circuits between an apparatus for recording and another apparatus

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The invention provides a double-screen display method based on an LVDS interface, wherein the LVDS interface comprises a first channel and a second channel, the first channel of the LVDS interface is connected with a first display screen, the second channel of the LVDS interface is connected with a second display screen, and the method comprises the following steps: acquiring display data, wherein the display data comprises first display data and second display data; performing odd-even row splicing processing on the first display data and the second display data to obtain spliced data; and respectively transmitting the spliced data to the first channel and the second channel according to the alternating sequence of parity. The invention realizes double-screen abnormal display based on the existing double-channel LVDS interface, improves the expansibility and compatibility of the LVDS interface, reduces the requirement of IC design, saves the pin of the IC and saves the cost.

Description

Double-screen display method based on LVDS (Low Voltage differential Signaling) interface, controller and electronic equipment
Technical Field
The invention relates to the technical field of display, in particular to a dual-screen display method based on an LVDS interface, a controller and electronic equipment.
Background
Among the digital signals output by the lcd driver board, signals such as RGB data signals, line synchronization, field synchronization, and pixel clock are included, and currently, the lcd driver board mostly adopts an LVDS (Low-Voltage Differential Signaling) interface to transmit data, so as to realize high-speed, Low-noise, long-distance, and high-accuracy data transmission.
In the related art, in order to implement multi-screen display, compatibility between single-screen display and multi-screen display is not very good under the condition of being based on the LVDS interface. The multi-set LVDS interfaces can only support high-resolution screens, such as dual-channel LVDS interfaces, signals are transmitted in an odd-even alternating mode, high-resolution large-screen display is achieved, and multi-screen different display cannot be supported. In order to realize multi-screen different display, the driver board IC needs to have different interface outputs, which increases the cost.
Therefore, the above problems need to be solved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a double-screen display method based on an LVDS interface, which realizes double-screen different display and simultaneous display based on the LVDS interface and simultaneously reduces the cost.
In order to solve the technical problems, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a method for dual-screen display based on an LVDS interface, where the LVDS interface includes a first channel and a second channel, the first channel of the LVDS interface is connected to a first display screen, and the second channel of the LVDS interface is connected to a second display screen, and the method includes:
acquiring display data, wherein the display data comprises first display data and second display data;
performing odd-even row splicing processing on the first display data and the second display data to obtain spliced data;
and respectively transmitting the spliced data to the first channel and the second channel according to the alternating sequence of parity.
Preferably, before the step of performing odd-even line splicing processing on the first display data and the second display data, the method further includes the steps of:
judging whether the display mode is double-screen display or not;
and if the judgment result of the splicing judgment module is yes, the data splicing module performs odd-even line splicing processing on the first display data and the second display data.
Preferably, before the splicing process, the method further comprises the steps of:
judging whether the first display data and the second display data are displayed simultaneously;
if yes, in the step of acquiring the first display data and the second display data, modifying to acquire only the first display data or the second display data.
Preferably, before the splicing process, the method further comprises the steps of:
respectively acquiring the scanning directions of the first display data and the second display data;
and rotating the first display data and the second display data according to the display directions of the first display screen and the second display screen connected with the LVDS interface and the acquired scanning direction.
In a second aspect, the present invention provides a controller for dual-screen display based on an LVDS interface, where the LVDS interface includes a first channel and a second channel, the first channel is used to connect to a first display screen, and the second channel is used to connect to a second display screen, the controller including:
the data acquisition module is used for acquiring display data, wherein the display data comprises first display data and second display data;
and the data transmission module is used for transmitting the first display data and the second display data to the first channel and the second channel respectively.
Preferably, the controller further comprises:
the splicing judgment module is used for judging whether the display mode is double-screen display or not;
and if the judgment result of the splicing judgment module is yes, the data splicing module carries out odd-even line splicing processing on the first display data and the second display data.
Preferably, the controller further comprises:
the display judging module is used for judging whether the first display data and the second display data are displayed simultaneously;
and the adjusting module is used for modifying the step of acquiring the first display data and the second display data into the step of acquiring only the first display data or the second display data when the judgment result of the display judging module is yes.
Preferably, the controller further comprises:
a scanning direction obtaining module, configured to obtain scanning directions of the first display data and the second display data respectively;
and the data rotation processing module is used for performing rotation processing on the first display data and the second display data according to the display directions of the first display screen and the second display screen connected with the LVDS interface and the acquired scanning direction.
In a third aspect, the present invention provides an electronic device comprising: the display device comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the computer program to realize the steps of the LVDS interface-based dual-screen display method.
In a fourth aspect, the present invention provides a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps of the method for LVDS interface-based dual-screen display according to any one of the above.
Compared with the related art, in an embodiment of the invention, the LVDS interface with two channels is respectively connected with the first display screen and the second display screen through the first channel and the second channel, then the first display data and the second display data are respectively obtained, odd-even line splicing is carried out on the first display data and the second display data, and the spliced data is transmitted to the first channel and the second channel through the LVDS interface according to the odd-even line alternating sequence, so that different pictures (namely, different displays on two screens) are displayed on the first display screen and the second display screen. The invention realizes double-screen differential display based on the existing double-channel LVDS interface, improves the expansibility and compatibility of the LVDS interface, and simultaneously reduces the requirement of IC design, such as reducing the use of IC pin and saving the cost.
Drawings
The present invention is described in detail below with reference to the attached drawings. The foregoing and other aspects of the invention will become more apparent and more readily appreciated from the following detailed description, taken in conjunction with the accompanying drawings. In the drawings:
FIG. 1 is a flow chart of a method for dual-screen display according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a connection between an LVDS interface and a dual screen according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a hardware implementation of a dual-screen display method according to an embodiment of the present invention;
FIG. 4 is a flow chart of another method for dual screen display in accordance with an embodiment of the present invention;
FIG. 5 is a flowchart illustrating a method for implementing a dual-screen display by a hardware controller according to an embodiment of the present invention;
FIG. 6 is a flowchart illustrating another method for dual-screen display according to an embodiment of the present invention;
FIG. 7 is a flowchart of another method for dual-screen display according to an embodiment of the present invention;
FIG. 8 is a flowchart illustrating a rotation process performed on display data in the dual-screen display method according to an embodiment of the present invention;
FIG. 9 is a block diagram of a hardware controller according to an embodiment of the present invention;
FIG. 10 is a schematic diagram illustrating a data splicing method according to an embodiment of the present invention;
fig. 11 is a schematic diagram of another data splicing method according to an embodiment of the present invention.
Detailed Description
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 application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof in the description and claims of this application and the description of the figures above, are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different objects and not for describing a particular order.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
Example one
FIG. 1 shows a flow chart of a method for providing a dual-screen display based on an LVDS interface of the present invention, and FIG. 2 shows a manner that a first channel and a second channel of an LVDS interface are connected with a first display screen and a second display screen, specifically, as an interface form, the LVDS interface may be a dual-channel (dual-channel) 8-bit output interface, wherein a data channel TXOUT0+, TXOUT0-, TXOUT1+, TXOUT1-, TXOUT2+, TXOUT2-, TXOUT3+, TXOUT3-, and a clock channel CLK TX 1+, TXTXOUT 1-form a first channel (first channel), a data channel TXOUT4+, OUT4-, OUT5+, TXOUT5-, TXOUT6+, OUT6-, TXOUT7+, TXOUT7-, and a clock channel TXOUT1+, CLK 1-form a second channel (second channel), the first channel of the LVDS interface is connected with a first display line, and the second display screen is connected with the second transmission line, of course, the LVDS interface may also be a two-way 6-bit output interface or a two-way multi-bit interface, and is not limited to the example given in this embodiment. Based on the LVDS interface, the method comprises the following steps:
s101, display data are obtained, wherein the display data comprise first display data and second display data.
In this embodiment, the LVDS interface is a dual channel interface having a first channel for connecting to the first display screen and a second channel for connecting to the second display screen. The acquired display data is based on the first display data and the second display data which are pre-processed according to the display requirements.
And S102, performing odd-even line splicing processing on the first display data and the second display data to obtain spliced data.
In this embodiment, after the first display data and the second display data are spliced, the obtained spliced data is data with alternating odd and even rows, and when the data is sent out through the LVDS interface, the data is sent out with alternating odd and even rows, and the data is sent out to the first display screen and the second display screen through the first channel and the second channel, so that the first display data and the second display data can be transmitted to the first display screen and the second display screen. As shown in fig. 3, a hardware implementation manner for performing a splicing process on first display data and second display data at a certain time is specifically that the display data (the display data includes the first display data and the second display data) is received by a hardware controller, then the display data is spliced in the hardware controller, and then the display data is alternately output through a first channel and a second channel of LVDS.
S103, respectively transmitting the spliced data to the first channel and the second channel according to the odd-even alternating sequence.
In this embodiment, because the LVDS interface has two channels, the first display data and the second display data can be spliced and then respectively transmitted to the first channel and the second channel through the hardware controller, and the first display screen and the second display screen respectively receive the first display data and the second display data and then output a display image, thereby implementing a function of dual-screen differential display.
Specifically, based on the characteristics of the LVDS interface, the display interface is divided into odd pixel points and even pixel points by adopting the dual-channel LVDS interface, and the scanning assignment of the odd pixel points and the even pixel points is completed within one pixel clock period. According to the embodiment of the invention, by utilizing the characteristic, the spliced data is subjected to scanning assignment in an odd-even alternating scanning assignment mode in one pixel clock cycle, so that the scanning assignment of the pixel points of the spliced data is completed, and different display on the first display screen and the second display screen is realized. Because the first channel and the second channel are respectively connected with different screens, double-screen display can be realized. The principle is that the first display data and the second display data form spliced data after splicing and can be output through the LVDS interface, for example, the spliced data of the first display data is positioned at an odd row position, the spliced data of the second display data is positioned at an even row position, and based on the characteristics of the dual-channel LVDS interface, when the data is output through the LVDS interface, odd row data is output to the first channel, even row data is output to the second channel, namely, the first display data is output through the first channel, and the second display data is output through the second channel, so that the dual-screen differential display is realized.
As shown in fig. 4 and fig. 5, as a further improvement of this embodiment, before the step of respectively transmitting the first display data and the second display data to the first channel and the second channel, the method further includes the steps of:
s201, judging whether the display mode is double-screen display or not.
Specifically, when the LVDS interface is accessed to only one display screen, the display is a non-dual-screen display, and when the LVDS interface is accessed to two display screens simultaneously, the display is a dual-screen display.
If the determination result in the step S201 is yes, the process proceeds to step S102, and the first display data and the second display data are subjected to splicing processing.
Specifically, data output by a first channel and data output by a second channel of the LVDS interface are odd-even alternating, so that when dual-screen display needs to be implemented, the first display data and the second display data need to be output to different display screens, and odd-even splicing is performed, so that the first display data and the second display data are odd-even row alternating. As shown in fig. 10, the first display data a [ x1] [ x2] and the second display data b [ y1] [ y2] are spliced in odd-even alternate rows and are superimposed to form data alternately output in odd-even rows, and the spliced data are output to the first display screen and the second display screen through the first channel and the second channel of the LVDS interface, respectively, because the spliced data are alternately output in odd-even rows. When the single-screen display is carried out, data splicing is not needed, data is input only by one, when the two channels are simultaneously connected into a large screen, the two channels are simultaneously output in odd-even mode out of the large screen, and if only a single-channel small screen is connected, the data can be output only through one channel.
As shown in fig. 5 and fig. 6, as a further improvement of this embodiment, before the splicing process, the method further includes the steps of:
s301, judging whether the first display data and the second display data are displayed simultaneously.
Specifically, the dual-screen display has two modes, one is the same display, the other is the different display, the same display means that the two display screens display the same content, and the different display means that the different content is displayed. Whether the display mode is the same display mode or not is confirmed based on the characteristics of the first display data and the second display data.
S302, if yes, in the step of acquiring the first display data and the second display data, only the first display data or the second display data is acquired.
Specifically, if the display mode is the same, only one path of display data needs to be acquired, so that the data acquisition efficiency can be improved, and the hardware burden and the power consumption can be reduced. In the process of acquiring data, the data address of data acquisition is set and modified into one group of data addresses.
As shown in fig. 7-8, as a further improvement of this embodiment, before the splicing process, the method further includes the steps of:
s401, scanning directions of the first display data and the second display data are respectively obtained.
Specifically, the scanning direction of the first display data and the second display data may be different from the display direction of the display screen, for example, some display screens are placed vertically (90 degrees), some display screens are placed along (0 degrees), or placed upside down (180 degrees), and the scanning direction of the first display data and the second display data is different from the placement direction of the display screens, so that normal display cannot be performed according to the placement direction of the display screens.
S402, rotating the first display data and the second display data according to the display directions of the first display screen and the second display screen connected with the LVDS interface and the acquired scanning direction.
Specifically, if the scanning direction of the first display data and the second display data is a 0 ° direction, and the first display screen and the second display screen are vertically disposed at 90 °, the scanning direction of the first display data and the second display data needs to be rotated. And rotating the scanning directions of the first display data and the second display data by 90 degrees, thereby realizing normal picture display on the first display screen and the second display screen which are vertically placed. Compared with other access modes, such as a mode of simultaneously accessing two display screens by using an LVDS interface and a VGA interface, if the scanning direction of data is not adjusted in advance, the displayed image is displayed based on the placement direction of the display screens (for example, the display screens are placed at 90 degrees, and the display screen is at 90 °).
As shown in fig. 11, before the first display data a [ x1] [ x2] and the second display data b [ y1] [ y2] are spliced in odd-even alternate rows, the second display data b [ y1] [ y2] needs to be rotated by 90 ° and then spliced in consideration of the fact that the display direction of the second display screen is 90 ° with respect to the first display screen, and as can be seen from the spliced data, the second display data b [ y1] [ y2] is rotated by 90 °. The first display data and the second display data are spliced and then respectively positioned in odd-even line positions, and are alternately output to the first display screen and the second display screen through the first channel and the second channel of the LVDS interface.
It is noted that if one display screen is displayed at 0 ° or 180 °, the other display screen is only displayed at 0 ° or 180 °; if one display screen displays 90 degrees or 270 degrees, the other display screen can only display 90 degrees or 270 degrees; unless the width and the height of the two screens are consistent, the two display screens can rotate in any direction, and compared with the traditional double-screen display realized through different interfaces, the double-screen display is not limited in the arrangement mode and the placement direction of the display screens, the scanning direction of the display data can be adjusted according to the arrangement mode and the placement direction of the display screens, and then different user requirements are met.
Compared with the related art, in the embodiment of the invention, the LVDS interface with two channels is respectively connected with the first display screen and the second display screen through the first channel and the second channel, then the first display data and the second display data are respectively obtained, and the first display data and the second display data are respectively transmitted to the first channel and the second channel, so that the first display screen and the second display screen can display different pictures (namely, double-screen different display). The invention realizes double-screen abnormal display based on the existing double-channel LVDS interface, improves the expansibility and compatibility of the LVDS interface, simultaneously, in the existing LVDS interface, two channels are generally used for driving a screen with large resolution, if two screens are driven, a group of LVDS controllers and interfaces are needed to be designed, but if the circuits of the two groups of interface controllers need to drive one screen, one more group of pins (pins) are needed, thus wasting one group of LVDS controllers. The present invention addresses this situation by driving large resolution screens with multiple channels at a time of a single screen. If the double-screen display is used, the screen with less channels is used for driving the double-screen display, so that the greater utilization rate of resources is achieved. The requirement of IC design is reduced, and the cost is saved.
Example two
As shown in fig. 9, the present invention provides a controller 100 for dual-screen display based on an LVDS interface, where the LVDS interface includes a first channel and a second channel, the first channel is used to connect to a first display screen, and the second channel is used to connect to a second display screen, the controller including:
the display device comprises a data acquisition module 101, a display module and a display module, wherein the data acquisition module is used for acquiring display data, and the display data comprises first display data and second display data;
the data splicing module 102 is configured to perform odd-even row splicing processing on the first display data and the second display data to obtain spliced data;
a data transmission module 103, configured to transmit the spliced data to the first channel and the second channel respectively according to an order of odd-even alternation.
As a further improvement of this embodiment, the controller further includes:
a splicing judgment module 201, configured to judge whether the display mode is a dual-screen display;
if the judgment result of the splicing judgment module 201 is yes, the data splicing module 102 performs odd-even row splicing processing on the first display data and the second display data.
As a further improvement of this embodiment, the controller further includes:
a display determining module 301, configured to determine whether the first display data and the second display data are displayed simultaneously;
an adjusting module 302, configured to modify the step of obtaining the first display data and the second display data to obtain only the first display data or the second display data when the determination result of the display determining module is yes.
As a further improvement of this embodiment, the controller further includes:
a scanning direction obtaining module 401, configured to obtain scanning directions of the first display data and the second display data respectively;
a data rotation processing module 402, configured to rotate the first display data and the second display data according to the display directions of the first display screen and the second display screen connected to the LVDS interface and the acquired scanning direction.
EXAMPLE III
The present invention also provides an electronic device, comprising: the display device comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the computer program to realize the steps of the method for the LVDS interface-based dual-screen display according to the embodiment.
Example four
The present invention provides a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps of the method for LVDS interface-based dual-screen display according to the first embodiment or the second embodiment.
It should be noted that the above-mentioned embodiments described with reference to the drawings are only intended to illustrate the present invention and not to limit the scope of the present invention, and it should be understood by those skilled in the art that modifications and equivalent substitutions can be made without departing from the spirit and scope of the present invention. Furthermore, unless the context indicates otherwise, words that appear in the singular include the plural and vice versa. Additionally, all or a portion of any embodiment may be utilized with all or a portion of any other embodiment, unless stated otherwise.

Claims (10)

1. A double-screen display method based on an LVDS interface, the LVDS interface comprises a first channel and a second channel, the first channel of the LVDS interface is connected with a first display screen, the second channel of the LVDS interface is connected with a second display screen, the method comprises the following steps:
acquiring display data, wherein the display data comprises first display data and second display data;
performing odd-even row splicing processing on the first display data and the second display data to obtain spliced data;
and respectively transmitting the spliced data to the first channel and the second channel according to the alternating sequence of parity.
2. The LVDS interface-based dual-screen display method according to claim 1, wherein before the step of performing odd-even line splicing processing on the first display data and the second display data, further comprising the steps of:
judging whether the display mode is double-screen display or not;
and if so, performing odd-even line splicing processing on the first display data and the second display data.
3. The LVDS-interface-based dual-screen display method according to claim 2, further comprising, before the splicing process, the steps of:
judging whether the first display data and the second display data are displayed simultaneously;
if yes, in the step of acquiring the first display data and the second display data, modifying to acquire only the first display data or the second display data.
4. The LVDS-interface-based dual-screen display method according to claim 2, further comprising, before the splicing process, the steps of:
respectively acquiring the scanning directions of the first display data and the second display data;
and performing rotation processing on the first display data and the second display data according to the display directions of the first display screen and the second display screen connected with the LVDS interface and the acquired scanning direction.
5. A controller for dual-screen display based on an LVDS interface, the LVDS interface including a first channel and a second channel, wherein the first channel is configured to be connected to a first display screen, and the second channel is configured to be connected to a second display screen, the controller comprising:
the data acquisition module is used for acquiring display data, wherein the display data comprises first display data and second display data;
the data splicing module is used for performing odd-even line splicing processing on the first display data and the second display data to obtain spliced data;
and the data transmission module is used for respectively transmitting the spliced data to the first channel and the second channel according to an odd-even alternating sequence.
6. The LVDS-interface-based controller for dual-screen display according to claim 5, further comprising:
the splicing judgment module is used for judging whether the display mode is double-screen display or not;
and if the judgment result of the splicing judgment module is yes, the data splicing module performs odd-even line splicing processing on the first display data and the second display data.
7. The LVDS-interface-based controller for dual-screen display according to claim 6, further comprising:
the display judging module is used for judging whether the first display data and the second display data are displayed simultaneously;
and the adjusting module is used for modifying the step of acquiring the first display data and the second display data into only acquiring the first display data or the second display data when the judgment result of the display judging module is yes.
8. The controller for a dual-screen display based on an LVDS interface according to claim 6, further comprising:
a scanning direction obtaining module, configured to obtain scanning directions of the first display data and the second display data, respectively;
and the data rotation processing module is used for performing rotation processing on the first display data and the second display data according to the display directions of the first display screen and the second display screen connected with the LVDS interface and the acquired scanning direction.
9. An electronic device, comprising: memory, processor and computer program stored on the memory and executable on the processor, the processor implementing the steps in the method for LVDS interface based dual-screen display according to any of the claims 1 to 4 when executing the computer program.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps in the LVDS interface-based dual-screen display method according to any one of claims 1 to 4.
CN202110331072.4A 2021-03-26 2021-03-26 Double-screen display method based on LVDS (Low Voltage differential Signaling) interface, controller and electronic equipment Pending CN115134551A (en)

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