CN110446084B - Delay determining method, display device, system and computer storage medium - Google Patents
Delay determining method, display device, system and computer storage medium Download PDFInfo
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- CN110446084B CN110446084B CN201910618608.3A CN201910618608A CN110446084B CN 110446084 B CN110446084 B CN 110446084B CN 201910618608 A CN201910618608 A CN 201910618608A CN 110446084 B CN110446084 B CN 110446084B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
- G06F3/1423—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display
- G06F3/1446—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display display composed of modules, e.g. video walls
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/4104—Peripherals receiving signals from specially adapted client devices
- H04N21/4122—Peripherals receiving signals from specially adapted client devices additional display device, e.g. video projector
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
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Abstract
The disclosure provides a time delay determination method, display equipment, a system and a computer storage medium, and relates to the field of image display. The delay determining method comprises the steps that display information issued by a video processing platform is received through display equipment, the display information is converted into image information adaptive to a display screen, when the display equipment is stored in the previous-stage display equipment, the display equipment receives the image information of the previous-stage display equipment, and the display equipment determines delay time according to the image information of the display equipment and the image information of the previous-stage display equipment, so that the display equipment can automatically determine the delay time according to the image information of two adjacent stages, and display errors caused by artificial recording of the delay time are avoided.
Description
Technical Field
The present disclosure relates to the field of image display, and in particular, to a delay determining method, a display device, a system, and a computer storage medium.
Background
With the development of the tiled display technology, large-screen display systems are widely applied to various fields such as broadcast television broadcasting, video monitoring, various production scheduling and the like. The large-screen display system is composed of a video processing platform and a plurality of display devices, wherein the video processing platform can split each frame of video picture into a plurality of groups of sub-pictures corresponding to different areas and send the sub-pictures to the display devices, and the display devices can be combined together to splice and display the received groups of sub-pictures into a whole video picture. However, when a plurality of display devices are used to display a video image in a combined manner, the problem of image display asynchronism between different display devices often exists because the video image is a dynamic image, and the display effect of the video image is seriously affected.
In the prior art, a worker is required to manually adjust a picture displayed by each display device, so that the requirement of synchronous display of the display devices is met.
Disclosure of Invention
The disclosure aims to provide a delay determining method, a display device, a system and a computer storage medium, which are used for solving the problem that the conventional large-screen display system needs to be manually adjusted to enable the display device to synchronously display.
In a first aspect, an embodiment of the present disclosure provides a delay determining method, which is applied to a display device in a display system, where the display system includes: the system comprises a video processing platform and at least two display devices, wherein the at least two display devices are cascaded; the method comprises the following steps:
the display equipment receives display information issued by the video processing platform and converts the display information into image information adaptive to the display screen;
when the display equipment is stored in the upper-level display equipment, the display equipment receives the image information of the upper-level display equipment;
the display device determines the delay time according to the image information of the display device and the image information of the previous display device.
Optionally, the display information is display information corresponding to N frames of images, the image information includes a Start of vertical line (STV) signal and a DATA (DATA) signal, and the DATA signal included in each frame of image in the N frames of images is different;
the display device determines the delay time according to the image information of the display device and the image information of the previous-stage display device, and comprises:
the display equipment determines the intra-frame delay between the STV signals according to the STV signal of the display equipment and the STV signal of the previous-stage display equipment;
when the display device detects the rising edge of the STV signal of the display device, M display DATA in the DATA signal of the display device are obtained, wherein M is an integer larger than 0;
when the display equipment detects the rising edge of the STV signal of the previous-stage display equipment, acquiring M display DATA in the DATA signal of the previous-stage display equipment;
the display equipment determines the inter-frame delay of the DATA signal on the display equipment and the DATA signal of the previous-stage display equipment according to a preset frame sequence, M display DATA in the DATA signal of the display equipment and M display DATA in the DATA signal of the previous-stage display equipment;
the display device determines a delay time based on the intra-frame delay and the inter-frame delay.
Optionally, after the display device determines the delay time according to the image information of the display device and the image information of the previous display device, the method further includes:
the display equipment sends the delay time of the display equipment and the previous stage of display equipment to the video processing platform so that the video processing platform sends display information according to the delay time.
Optionally, after the display device determines the delay time according to the image information of the display device and the image information of the previous display device, the method further includes:
the display equipment receives the delay time between two adjacent stages of display equipment in the display system, and calculates the final delay time of each display equipment in the display system according to the received delay time between two adjacent stages of display equipment;
and the display equipment issues the final delay time to corresponding display equipment so that the corresponding display equipment performs delay compensation on the display information issued by the video processing platform according to the final delay time.
In a second aspect, an embodiment of the present disclosure provides a display device, which is applied in a display system, where the display system includes: the system comprises a video processing platform and at least two display devices, wherein the at least two display devices are cascaded;
the display device includes: a Central Processing Unit (CPU) and a timing control Unit;
the CPU is used for receiving the display information issued by the video processing platform, converting the display information and sending the converted display information to the time sequence control unit;
the time sequence control unit is used for converting the converted display information into image information adaptive to the display screen and sending the image information to the CPU;
the CPU is also used for receiving the image information of the upper-level display equipment when the display equipment is stored in the upper-level display equipment; and determining the delay time according to the image information of the display equipment and the image information of the display equipment at the previous stage.
Optionally, the display information is display information corresponding to N frames of images, the image information includes an STV signal and a DATA signal, and the DATA signal included in each frame of image in the N frames of images is different;
the CPU is specifically used for determining the intra-frame delay between the STV signals according to the STV signal of the display equipment and the STV signal of the upper-level display equipment; when the rising edge of the STV signal of the display equipment is detected, M display DATA in the DATA signal of the display equipment are obtained, wherein M is an integer larger than 0; when the rising edge of the STV signal of the upper-level display equipment is detected, M display DATA in the DATA signal of the upper-level display equipment are obtained; determining the inter-frame delay of the DATA signal on the display equipment and the DATA signal of the previous display equipment according to a preset frame sequence and M pieces of display DATA; and determining delay time according to the intra-frame delay and the inter-frame delay.
Optionally, the CPU is further configured to send the delay time of the display device and the delay time of the previous stage of display device to the video processing platform, so that the video processing platform issues the display information according to the delay time.
Optionally, the CPU is further configured to receive delay time between two adjacent stages of display devices in the display system, and calculate final delay time of each display device in the display system according to the received delay time between two adjacent stages of display devices; and issuing the final delay time to corresponding display equipment so that the corresponding display equipment performs delay compensation on the display information issued by the video processing platform according to the final delay time.
In a third aspect, an embodiment of the present disclosure provides a display system, including: a video processing platform and at least two display devices according to the second aspect, the at least two display devices being cascaded.
In a fourth aspect, the disclosed embodiments also provide a computer storage medium, on which a computer program is stored, where the computer program is executed by a processor to perform the steps of the method in the first aspect.
The beneficial effects of this disclosure are:
in the delay determination method, the display device, the system and the computer storage medium provided by the embodiment of the disclosure, the delay time between the two adjacent stages of display devices is calculated through the image information received by the two adjacent stages of display devices, so that the automatic determination of the delay time is realized, and the error caused by the manual adjustment of the staff is avoided.
Drawings
To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present disclosure and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings may be obtained from the drawings without inventive effort.
Fig. 1 shows a schematic structural diagram of a display system provided by an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of another structure of a display system provided by an embodiment of the present disclosure;
fig. 3 is a schematic flowchart illustrating a method for determining a delay according to an embodiment of the present disclosure;
fig. 4 is another schematic flow chart of a delay determination method provided by the embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a display device provided by an embodiment of the present disclosure;
FIG. 6 is a schematic structural diagram of a display system provided by an embodiment of the present disclosure;
fig. 7 shows a flowchart of a delay determination method provided by an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some, but not all embodiments of the present disclosure. The components of the embodiments of the present disclosure, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present disclosure, presented in the figures, is not intended to limit the scope of the claimed disclosure, but is merely representative of selected embodiments of the disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The display system can display ultra-large pictures with ultra-high resolution by a splicing display technology, and is widely applied to various fields of broadcast television broadcasting, video monitoring, various production scheduling and the like.
Based on this, the embodiment of the present disclosure provides a delay determining method, which is applied to a display device in a display system. The delay time between the display devices is determined by the delay time determining method, so that the display devices can automatically determine the delay time, and possible errors caused by artificial adjustment are avoided.
Fig. 1 shows a schematic structural diagram of a display system provided by an embodiment of the present disclosure.
As shown in fig. 1, the display system may include: a video processing platform 110 and at least two display devices 120, the at least two display devices 120 being cascaded. Optionally, a video processing platform 110 is connected to each display device 120 separately. Here, the cascade refers to that the display devices 120 are connected in sequence. In the display system, the video processing platform 110 may issue the display information to each display device 120, and each display device 120 may display a corresponding picture according to the display information issued by the video processing platform 110.
Fig. 2 shows another schematic structural diagram of a display system provided by the embodiment of the present disclosure.
The display system may include: a video processing platform 110 and at least two display devices 120, the at least two display devices 120 being cascaded. The difference from the display system shown in fig. 1 is that in the display system shown in fig. 2, the video processing platform 110 may be connected to only the first display device 120. In the display system shown in fig. 2, the display information corresponding to each display device 120 is sent to the first display device 120 together, and after the first display device 120 intercepts the display information corresponding to itself from the received display information, the display information is sent to the next-stage display device 120, and so on until the last-stage display device 120 receives the display information corresponding to itself.
In the display system shown in fig. 1 or fig. 2, the video processing platform 110 may be a computer, a server, or other devices capable of processing video pictures and communicating with the display device 120, which is not limited in this disclosure. The delay determination method provided by the embodiment of the disclosure can be applied to the display device in the display system shown in any one of fig. 1 or fig. 2.
Fig. 3 shows a schematic flow chart of a delay determination method provided by the embodiment of the present disclosure.
As shown in fig. 3, the delay determining method may include:
s301, the display device receives display information issued by the video processing platform and converts the display information into image information adaptive to the display screen.
Because the signal transmitted by the video processing platform is different from the signal displayed by the display screen, after the display device receives the display information sent by the video processing platform, the display information needs to be converted into image information adaptive to the display screen. For example, the display device may convert a display signal transmitted by the video processing platform based on a High Definition Multimedia Interface (HDMI) protocol into image information adapted to be displayed on the display screen. In addition, Display information may be transmitted using a Display Port (DP) or a Digital Visual Interface (DVI), for example.
The display screen may be self-contained in the display device, or may be an independent display screen connected externally, and the disclosure is not limited thereto.
And S302, when the display device exists in the upper-level display device, the display device receives the image information of the upper-level display device.
For the display system, each display device may send the image information obtained by conversion to the next-stage display device, wherein for the last-stage display device, if the next-stage display device does not exist, the image information does not need to be sent. Accordingly, in each cascaded display device, the first display device does not have a previous display device, and therefore, for the display devices except the first display device, the image information sent by the previous display device can be received.
And S303, the display device determines the delay time according to the image information of the display device and the image information of the previous-stage display device.
After the display device receives the image information sent by the previous-level display device, the delay time of the display device relative to the previous-level display device can be determined by comparing the image information of the display device with the image information of the previous-level display device.
Specifically, the STV signal included in the image information is used to indicate the start of one frame image, and the DATA signal is used to indicate the voltage value applied for display of the display screen. When the display device detects a rising edge of the STV signal, the display is performed by applying voltages to the pixels on the display screen via the display DATA in the DATA signal (which is a set of binary DATA, e.g., every 3 bits of the DATA signal represents a voltage applied to a pixel, and these 3 bits can be referred to as a display DATA).
Optionally, as shown in fig. 4, the determining, by the display device, the delay time according to the image information of the display device and the image information of the previous-stage display device includes:
s401, the display device determines the intra-frame delay between the STV signals according to the STV signal of the display device and the STV signal of the previous-stage display device.
Since the time required for the display screen to display a frame is fixed, the STV signal is a periodic signal, and the display device can compare the STV signals of the display device itself and the display device at the previous stage to determine the delay time within a frame, which is referred to as an intra-frame delay.
S402, when the display device detects the rising edge of the STV signal of the display device, M display DATA in the DATA signal of the display device are obtained, wherein M is an integer larger than 0.
And S403, when the display device detects the rising edge of the STV signal of the previous-level display device, acquiring M display DATA in the DATA signal of the previous-level display device.
And S404, the display device determines the inter-frame delay of the DATA signal on the display device and the DATA signal of the previous display device according to the preset frame sequence, the M display DATA in the DATA signal of the display device and the M display DATA in the DATA signal of the previous display device.
Because the display information sent by the video processing platform to the display system is the same, the display information includes N frames of images, and each frame of image is preset to be different, for example, 4 frames of images, which are red, yellow, blue and green in sequence. Then, after the display apparatus converts the image information, the display DATA contained in the DATA signal of each frame is different. One display device determines that red is being displayed and the upper display device is displaying blue. At this time, the display apparatus may determine the difference in the number of frames between the present display apparatus and the previous display apparatus to be two frames from the colors and the frame order of the 4-frame images. And, because the displayed time of each frame is fixed, the inter-frame delay can be calculated according to the frame number difference of two frames. The frame sequence may be pre-stored in the display device, or may be issued to the display device by the video processing platform during the delay determination process.
It should be noted that the M value in the M pieces of display data is determined according to preset display information. If the content displayed by the current frame can be confirmed through a single color, for example, each frame of image in the display information issued by the video processing platform is a pure color, M may be 1, that is, the color of the current frame can be confirmed only by detecting 1 display data. If the displayed content of the current frame is confirmed by the color order of the display data, M may be set to a desired value, such as by the display device determining the current frame by the appearance order of the first 3 display data. Of course, it may also be determined by analyzing the complete content of the current frame, and M needs to be set to a corresponding value, which is not described herein again.
S405, the display device determines delay time according to the intra-frame delay and the inter-frame delay.
Based on the above steps, the intra-frame delay and the inter-frame delay between the two display devices can be determined, and the delay time between the two display devices can be determined by accumulating.
In addition, since there is a precedence order between the times when two adjacent display devices receive the display information, but the display devices cannot determine which device is the first when performing the calculation, there may be both positive and negative values in the inter-frame delay and the intra-frame delay. For example, when the inter-frame delay and the true intra-delay are positive values, it means that the present display apparatus is faster than the previous-stage display apparatus, and when negative values, it means that the present display apparatus is slower than the previous-stage display apparatus.
It should be noted that the image information may include an STV signal and a DATA signal, or may be other signals as long as the signals reflect a delay time between the display device and the previous display device.
In view of the above, the method for determining delay provided by the embodiment of the present disclosure includes receiving, by a display device, display information delivered by a video processing platform, and converting the display information into image information adapted to a display screen, where when the display device exists in a previous-stage display device, the display device receives image information of the previous-stage display device, and the display device determines a delay time according to the image information of the display device and the image information of the previous-stage display device, so that a display system can perform delay compensation on a picture to be displayed based on the determined delay time, and the delay time is automatically determined by the display device according to the image information of the display device and the image information of the previous-stage display device.
Moreover, automatic compensation in the display system can be further performed based on the method, so that manual operation is not needed, the problem of display dislocation among different display devices can be avoided, and high-precision synchronization of display pictures of the display devices is realized.
In the display system shown in fig. 1 and 2, the display devices may include n display devices, and the delay time between two display devices may be determined by the above-mentioned delay time determination method, and if the delay time between all the display devices needs to be determined, the delay time needs to be repeated n-1 times.
After the delay time of the display system is determined, delay compensation can be performed through one display device or one video processing platform, so that synchronous display of the display system is achieved.
When the delay compensation is performed, it is necessary to perform difference processing according to differences in display systems. For example, with respect to the display system provided in fig. 1, after the display information of the video processing platform is respectively sent to each display device, in a first manner, the display device determines the delay time according to the image information of the display device and the image information of the previous display device, the method may further include:
the display equipment sends the delay time of the display equipment and the previous stage of display equipment to the video processing platform so that the video processing platform sends display information according to the delay time.
After a display device determines the delay time between the display device and the previous display device, the delay time can be sent to the video processing platform. After the video processing platform determines that all the delay times in the display system are acquired (i.e., the delay times of n-1 display devices), one display device which is displayed slowest can be selected from the n-1 delay times as a reference display device, and the system delay time of other display devices in the display system relative to the reference display device is calculated.
When the video processing platform sends the display information to each display device, the display information is sent to the reference display device first, and the display information is sent to other display devices in sequence according to the system delay time relative to the reference display device, so that the synchronous display of the display system is realized.
In a second mode, after the display device determines the delay time according to the image information of the display device and the image information of the previous display device, the method may further include:
the display equipment receives delay time between two adjacent stages of display equipment in the display system, and system delay time of each display equipment in the display system is calculated according to the received delay time between the two adjacent stages of display equipment;
and the display equipment issues the system delay time to the corresponding display equipment, so that the corresponding display equipment performs delay compensation on the display information issued by the video processing platform according to the system delay time.
In the second mode, unlike the first mode, one of the plurality of display devices is selected in advance as a computing device, and the other display devices transmit their own determined delay times to the computing device, and the computing device determines the system delay time of each display device. For example, the display device displaying the slowest is taken as a reference display device, the system delay time of the reference display device is set to 0, and the system delay times of the other display devices are calculated based on the reference display device.
And after one display device receives the display information sent by the video processing platform, the display device carries out delay compensation according to the system delay time sent by the computing device.
In addition, for the display system provided in fig. 2, since the display information of the complete image sent by the video processing platform sequentially arrives at the display device 1 …, each display device respectively intercepts and displays the required part of the display information. Therefore, the video processing platform cannot perform delay compensation by separately issuing display information, and therefore, the display system shown in fig. 2 needs to perform delay compensation by using the second method.
In contrast to the foregoing method for determining a delay, the present disclosure further provides a display device applied to a display system, where the display system includes: the system comprises a video processing platform and at least two display devices, wherein the at least two display devices are cascaded;
the display device, as shown in fig. 5, includes: a CPU and a timing control unit;
the CPU is used for receiving the display information issued by the video processing platform, converting the display information and sending the converted display information to the time sequence control unit;
the time sequence control unit is used for converting the converted display information into image information adaptive to the display screen and sending the image information to the CPU;
the CPU is also used for receiving the image information of the upper-level display equipment when the display equipment is stored in the upper-level display equipment; and determining the delay time according to the image information of the display equipment and the image information of the display equipment at the previous stage.
Optionally, the display information is display information corresponding to N frames of images, the image information includes an STV signal and a DATA signal, and the DATA signal included in each frame of image in the N frames of images is different;
the CPU is specifically used for determining the intra-frame delay between the STV signals according to the STV signal of the display equipment and the STV signal of the upper-level display equipment; when the rising edge of the STV signal of the display equipment is detected, M display DATA in the DATA signal of the display equipment are obtained, wherein M is an integer larger than 0; when the rising edge of the STV signal of the upper-level display equipment is detected, M display DATA in the DATA signal of the upper-level display equipment are obtained; determining inter-frame delay of the DATA signal on the display device and the DATA signal of the previous display device according to a preset frame sequence, M display DATA in the DATA signal of the display device and M display DATA in the DATA signal of the previous display device; the delay time is determined based on the intra-frame delay and the inter-frame delay.
Optionally, the CPU is further configured to send the delay time of the display device and the delay time of the previous stage of display device to the video processing platform, so that the video processing platform issues the display information according to the delay time.
Optionally, the CPU is further configured to receive a delay time between two adjacent stages of display devices in the display system, and calculate a system delay time of each display device in the display system according to the received delay time between two adjacent stages of display devices; and issuing the system delay time to the corresponding display equipment so that the corresponding display equipment performs delay compensation on the display information issued by the video processing platform according to the system delay time.
The following describes a display system in detail by way of an example, and the display system, as shown in fig. 6, includes: a video processing platform and four display devices (i.e., display device 1, display device 2, display device 3, and display device 4). The video processing platform is connected with each display device through the HDMI cable, so that the video processing platform transmits display information of images to each display device through the HDMI cable, the video processing platform is further connected with each display device through a serial port (not shown in the figure), the video processing platform can issue a frame sequence to the display devices through the serial port, delay confirmation of adjacent two stages of display devices is started according to the frame sequence, and the display devices can upload determined delay time to the video processing platform through the serial port.
The display equipment comprises a main board, a time sequence control board and a display screen; CPU sets up in the mainboard, and sequential control chip and driver chip set up in the sequential control board. In one display device, a CPU can receive display information in an HDMI format, and the CPU is connected to a timing control chip, so that the CPU converts the received display information in the HDMI format into display information in a Low-Voltage Differential Signaling (LVDS) format, and transmits the display information to the timing control chip; the time sequence control chip can convert the received display information in the LVDS format into image information, wherein the image information comprises an STV signal and a DATA signal; the time sequence control chip is connected with the driving chip, and the driving chip is respectively connected with the CPU and the display screen, so that the driving chip can respectively transmit the STV signal and the DATA signal to the display screen for displaying and transmit the STV signal and the DATA signal to the CPU on the display device.
Between two adjacent stages of display devices, for example, the driving chip of the display device 1 is connected to the CPU of the display device 2, so that the driving chip can transmit the STV signal and the DATA signal received by itself to the CPU of the display device 2, so that the CPU of the display device 2 can analyze and compare the STV signal and the DATA signal transmitted by the driving chip of itself and the STV signal and the DATA signal transmitted by the display device 1 to determine the delay time between the display device 1 and the display device 2. In addition, the same between the display device 2 and the display device 3, and between the display device 3 and the display device 4, the corresponding connection relationship will not be described again here. For a display device, the CPU respectively reserves two pins for the STV signal and the DATA signal of the display device, and reserves two pins for the STV signal and the DATA signal of the previous display device, so that the source of the signals can be confirmed through different pins.
In addition, it should be noted that, since the display device 1 is the first display device in the display system, there is no previous display device, and the CPU does not acquire the STV signal and the DATA signal of the previous display device; the display device 4 is the last display device of the display system, and thus there is no next-stage display device, and its driving chip does not transmit the STV signal and the DATA signal to the next-stage display device.
When it is necessary to detect the delay of the display system, as shown in fig. 7, each apparatus performs the following steps:
and S1, the video processing platform issues a frame sequence related to the preset display information for delay detection to the CPU of each display device through the serial port.
In the preset display information, 8 frames of images, which are white, red, orange, yellow, green, blue, purple, and black in sequence, may be included, and the corresponding DATA signals may be 000, 001, 010, 011, 100, 101, 110, and 111, respectively. Correspondingly, after the video processing platform issues the frame sequence, each display device respectively stores the frame sequence, that is, the first frame is 000, the second frame is 001, the third frame is 010, the fourth frame is 011, the fifth frame is 100, the sixth frame is 101, the seventh frame is 110, and the eighth frame is 111. When the frame sequence is issued, the video processing platform is informed of the display devices to start the detection of the delay time. And the video processing platform starts timing, and sends display information after the timing reaches the preset 1S. Here, the timing time of the video processing platform may be set according to specific situations, and it is only necessary to ensure that each display device has received the frame sequence when the video processing platform issues the display information.
S2, the video processing platform starts the delay detection, and issues the preset display information to each display device (i.e., the display devices 1 to 4) through the HDMI interface.
S3, each display device processes the display information and generates image information.
After receiving the display information, the CPU starts to process the display information, converts the display information transmitted by the HDMI protocol into the display information of the LVDS protocol, and sends the display information to the time sequence control chip.
The time sequence control chip converts the display information of the LVDS protocol into image information which can be identified by the display screen, wherein the image information comprises STV signals, DATA signals and other signals. In the method, the delay is determined by the STV signal and the DATA signal, so that the effect of other signals is not considered. Only the display device 1 and the display device 2 are described as an example, and details are omitted here as well as between the display device 2 and the display device 3 and between the display device 3 and the display device 4.
S4, the driving chip of the display device 1 transmits the STV signal and the DATA signal to the display screen, the CPU of the display device 1, and the CPU of the display device 2, respectively. The driving chip of the display device 2 transmits the STV signal and the DATA signal to the display screen and its own CPU. The display device 2 will now also transmit the STV signal and the DATA signal to the display device 3.
Thus, it is possible for the display device 2 to receive the STV signal and the DATA signal of itself, and the STV signal and the DATA signal from the display device 1.
S5, the CPU of the display device 2 detects the intra delay between the display device 1 and the display device 2 through the pin (denoted as pin 1) connected to the STV signal of its own driver chip and the pin (denoted as pin 2) connected to the STV signal of the driver chip of the display device 1.
For example, the CPU of the display device 2 starts a timer to count when detecting a rising edge on the pin 1, and terminates the counting when detecting a rising edge on the pin 2 after 3 ms. At this time, the timer time (3ms) is the intra-frame delay between the display device 1 and the display device 2. Further, since the rising edge of the STV signal itself is detected first, which indicates that the display speed of the STV signal itself is faster than that of the display device 1, the intra-frame delay may be recorded as +3 ms.
S6, after the CPU of the display device 2 detects the rising edge of the STV signal, the DATA signal corresponding to the pin is buffered, and the inter-frame delay is determined by the pins to which the two DATA signals are connected (the pin to which the DATA signal of the driver chip of the display device itself is connected is denoted as pin 3, and the pin to which the DATA signal of the driver chip of the display device of the previous stage is connected is denoted as pin 4).
The buffering of the DATA signal transmitted on pin 3 begins after the CPU of the display device 2 detects a rising edge on pin 1. At this time, if the current frame of the display device 2 displays yellow, the recorded display data is determined to be 010 according to the 5 pieces of display data.
When the CPU of the display device 2 detects a rising edge on pin 2, the display data on pin 4 is similarly buffered. At this time, the display apparatus 1 records the display data as 000 when the current frame shows red.
The CPU of the display device 2 determines 000 as the first frame and 010 as the third frame according to the recorded frame sequence, and the difference between the frame numbers of the two frames is two frames. Since the display time of each frame is fixed to 16.7ms and the display speed of the display device 2 is faster than that of the display device 1, it can be determined that the inter-frame delay of the display device 1 and the display device 2 is +33.4 ms.
S7, the CPU of the display device 2 determines that the delay time of the display device 2 and the display device 1 is +36.4ms based on the calculated intra-frame delay and inter-frame delay.
And S8, the CPU of the display device 2 sends the delay time between the display device 1 and the display device 2 to the video processing platform through the serial port.
The video processing platform records the delay time of this time as 36.7ms and as the delay time of the display device 1 and the display device 2.
Thereafter, the video processing platform calculates the delay time (+10ms) between the display device 2 and the display device 3 and the delay time (-34.7ms) between the display device 3 and the display device 4, and records the feedback. After the video processing platform records the delay times of the display devices 1 to 4, respectively, the determination of the delay is completed.
Further, in order to enable the display devices to automatically display the screen synchronously, each display device in the display system displays the delay time (recorded as the system delay time) required by the display device in actual display, and enables the display device to perform delay compensation according to the recorded system delay time.
S9, the video processing platform sends each determined delay time to the display device 1 as a computing device, and the display device 1 computes the system delay time of each display device in the display system.
In calculating the system delay times, the video processing platform may send each delay time to a predetermined display device, here display device 1 as the computing device.
After the display device 1 receives that the delay time of the display device 1 and the display device 2 is +36.7ms, the delay time of the display device 2 and the display device 3 is +10ms, and the delay time of the display device 3 and the display device 4 is-34.7 ms, the display device with the slowest display in the display system is recorded as a reference display device. Since the display speed of the display device 1 is the slowest, the system delay time of the display device 1 is 0ms, and the system delay times of the display device 2, the display device 3, and the display device 4 are respectively calculated as 12ms, 36.7ms, and 46.7ms from the display device 1. The steps are not shown one by one in the figure.
S10, the display device 1 transmits the system delay time to the display device 2, the display device 3, and the display device 4.
S11, after each display device receives the display information actually displayed, the delay compensation is performed on the display information according to the system delay time.
The video processing platform sends the actually displayed display information to each display device respectively, at this time, the display information preferentially arrives at the display device 3, the display device 3 starts the timing of 46.7ms, arrives at the display device 2 after 10ms, the display device 2 starts the timing of 36.7ms, arrives at the display device 4 after 34.7ms, starts the timing of 12ms, and arrives at the display device 1 after 46.7 ms. At this time, the timings of the display device 3, the display device 2, and the display device 4 described above are reached, and four display devices are caused to simultaneously perform display, thereby realizing synchronous display of the display devices in the display system.
In addition, the embodiment of the present disclosure further provides a computer storage medium, where a computer program is stored on the computer storage medium, and when the computer program is executed by a processor, the steps of the foregoing delay determination method are performed.
The embodiment of the disclosure provides a delay determining method, display equipment and a system, and the delay determining method is used for determining delay time among the display equipment, so that the display equipment can automatically determine the delay time, and possible errors caused by artificial adjustment are avoided.
In addition, the automatic compensation of the delay time can be realized through the cooperation between the video processing platform and the display equipment, and the synchronous display between the display equipment is realized.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (8)
1. A delay time determination method, applied to a display device in a display system, the display system comprising: the system comprises a video processing platform and at least two display devices, wherein the at least two display devices are cascaded; the method comprises the following steps:
the display equipment receives display information issued by the video processing platform and converts the display information into image information adaptive to a display screen;
when the display equipment has the upper-level display equipment, the display equipment receives image information of the upper-level display equipment;
the display equipment determines delay time according to the image information of the display equipment and the image information of the upper-level display equipment;
the display information is display information corresponding to N frames of images, the image information comprises STV signals and DATA signals, and the DATA signals corresponding to each frame of image in the N frames of images are different;
the display device determines the delay time according to the image information of the display device and the image information of the previous-stage display device, and comprises:
the display equipment determines the intra-frame delay between the STV signals according to the STV signal of the display equipment and the STV signal of the upper-level display equipment;
when the display equipment detects the rising edge of the STV signal of the display equipment, M display DATA in the DATA signal of the display equipment are obtained, wherein M is an integer larger than 0;
when the display equipment detects the rising edge of the STV signal of the upper-level display equipment, acquiring M display DATA in the DATA signal of the upper-level display equipment;
the display equipment determines the inter-frame delay of the DATA signal on the display equipment and the DATA signal of the previous-stage display equipment according to a preset frame sequence, M display DATA in the DATA signal of the display equipment and M display DATA in the DATA signal of the previous-stage display equipment;
and the display equipment determines delay time according to the intra-frame delay and the inter-frame delay.
2. The method according to claim 1, wherein the display device determines the delay time according to the image information of the display device and the image information of the previous display device, and further comprises:
and the display equipment sends the delay time of the display equipment and the previous-stage display equipment to the video processing platform so that the video processing platform issues display information according to the delay time.
3. The method according to claim 1, wherein the display device determines the delay time according to the image information of the display device and the image information of the previous display device, and further comprises:
the display equipment receives delay time between two adjacent stages of display equipment in the display system, and system delay time of each display equipment in the display system is calculated according to the received delay time between two adjacent stages of display equipment;
and the display equipment issues the system delay time to corresponding display equipment so that the corresponding display equipment performs delay compensation on the display information issued by the video processing platform according to the system delay time.
4. A display device, applied to a display system, the display system comprising: the system comprises a video processing platform and at least two display devices, wherein the at least two display devices are cascaded;
the display device includes: a central processing unit CPU and a time sequence control unit;
the CPU is used for receiving the display information issued by the video processing platform, converting the display information and sending the converted display information to the time sequence control unit;
the time sequence control unit is used for converting the converted display information into image information adaptive to a display screen and sending the image information to the CPU;
the CPU is also used for receiving the image information of the upper-level display equipment when the upper-level display equipment exists in the display equipment; determining delay time according to the image information of the display equipment and the image information of the upper-level display equipment;
the display information is corresponding to N frames of images, the image information comprises STV signals and DATA signals, and the DATA signals contained in each frame of image in the N frames of images are different;
the CPU is specifically used for determining the intra-frame delay between the STV signals according to the STV signal of the display equipment and the STV signal of the upper-level display equipment; when the rising edge of the STV signal of the display equipment is detected, M display DATA in the DATA signal of the display equipment are obtained, wherein M is an integer larger than 0; when the rising edge of the STV signal of the upper-level display equipment is detected, M display DATA in the DATA signal of the upper-level display equipment are obtained; determining inter-frame delay of the DATA signal on the display device and the DATA signal of the previous display device according to a preset frame sequence, M display DATA in the DATA signal of the display device and M display DATA in the DATA signal of the previous display device; and determining delay time according to the intra-frame delay and the inter-frame delay.
5. The display device according to claim 4, wherein the CPU is further configured to send the delay time of the display device and the display device at the previous stage to the video processing platform, so that the video processing platform issues the display information according to the delay time.
6. The display device according to claim 4, wherein the CPU is further configured to receive a delay time between two adjacent stages of display devices in the display system, and calculate a system delay time of each display device in the display system according to the received delay time between two adjacent stages of display devices; and issuing the system delay time to corresponding display equipment so that the corresponding display equipment performs delay compensation on the display information issued by the video processing platform according to the system delay time.
7. A display system, comprising: a video processing platform and at least two display devices according to any of claims 4-6, said at least two display devices being cascaded.
8. A computer storage medium, characterized in that the computer storage medium has stored thereon a computer program which, when being executed by a processor, performs the steps of the method according to any one of claims 1 to 3.
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