CN116301681A - Display device and picture backtracking method thereof - Google Patents

Display device and picture backtracking method thereof Download PDF

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Publication number
CN116301681A
CN116301681A CN202111563877.8A CN202111563877A CN116301681A CN 116301681 A CN116301681 A CN 116301681A CN 202111563877 A CN202111563877 A CN 202111563877A CN 116301681 A CN116301681 A CN 116301681A
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China
Prior art keywords
backtracking
display device
image
picture
display
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CN202111563877.8A
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Chinese (zh)
Inventor
高金圳
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Jichen Co ltd
Giga Byte Technology Co Ltd
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Jichen Co ltd
Giga Byte Technology Co Ltd
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Priority to CN202111563877.8A priority Critical patent/CN116301681A/en
Publication of CN116301681A publication Critical patent/CN116301681A/en
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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
    • 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
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
    • G06F3/0655—Vertical data movement, i.e. input-output transfer; data movement between one or more hosts and one or more storage devices
    • G06F3/0656—Data buffering arrangements

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Controls And Circuits For Display Device (AREA)

Abstract

A display device, comprising: an image buffer; a display module; and a display controller for receiving an image signal from a host and storing the image signal in the image buffer. In response to the display controller receiving a trigger signal, the display controller controls the display device to enter a picture backtracking mode. The display controller takes out the backtracking image corresponding to the backtracking time point from the image buffer according to a user instruction, and plays the backtracking image on the display module.

Description

Display device and picture backtracking method thereof
Technical Field
The present invention relates to a display device, and more particularly, to a display device and a picture backtracking method thereof.
Background
Because of technological advances, computer users use displays for ever longer periods of time each day. However, the user often forgets to perform the previous operation when operating the computer, and cannot return to the previous step, or the user wants to watch the previously viewed screen. However, the conventional display device does not have a picture backtracking function, which sometimes causes inconvenience to the user.
Disclosure of Invention
In view of the above, the present invention provides a display device and a picture backtracking method thereof to solve the above-mentioned problems.
The present invention provides a display device including: an image buffer; a display module; and a display controller for receiving an image signal from a host and storing the image signal in the image buffer. In response to the display controller receiving a trigger signal, the display controller controls the display device to enter a picture backtracking mode. The display controller takes out the backtracking image corresponding to the backtracking time point from the image buffer according to a user instruction, and plays the backtracking image on the display module.
In some embodiments, the display controller first compresses the image signal to obtain a compressed image signal, and stores the compressed image signal into the image buffer. When the display device is in the picture backtracking mode, the display controller obtains the compressed image signal corresponding to the backtracking time point from the image buffer, and decompresses the compressed image signal to obtain the backtracking image.
In some embodiments, the video buffer stores the compressed video signal for a predetermined time interval, and the display controller uses a first-in first-out mechanism to store the compressed video signal to the video buffer.
In some embodiments, the display device further comprises: the input interface comprises a first function key, a second function key and a third function key, wherein the second function key is used for generating the trigger signal to start or stop the picture backtracking mode of the display device, and the first function key and the third function key are used for generating the user instruction and respectively controlling the picture backwinding function and the picture backward function in the picture backtracking mode.
In some embodiments, when the display device is in the screen backtracking mode and a user presses the first function key or the third function key and releases the first function key, the display controller goes forward or backward from the current search time point for a predetermined number of seconds to obtain the backtracking time point, and obtains the backtracking image corresponding to the backtracking time point from the image buffer.
In some embodiments, when the display device is in the screen backtracking mode and a user keeps pressing the first function key or the third function key, the display controller searches the backtracking image from the current searching time point fast forward or backward.
In some embodiments, when the display device is in the picture backtracking mode and the display controller receives the trigger signal from the second function key, the display controller controls the display device to return to the normal picture mode.
In some embodiments, the display controller stops writing the image signal to the image buffer in response to the display device entering the picture backtracking mode.
The invention further provides a picture backtracking method of a display device, wherein the display device comprises an image buffer, a display module and a display controller, and the method comprises the following steps: receiving an image signal from a host by using the display controller, and storing the image signal in the image buffer; responding to the display controller receiving a trigger signal, controlling the display device to enter a picture backtracking mode by using the display controller; and taking out the backtracking image corresponding to the backtracking time point from the image buffer by utilizing the display controller according to a user instruction, and playing the backtracking image on the display module.
Drawings
FIG. 1 is a block diagram of a computer system according to an embodiment of the invention.
Fig. 2A-2C are schematic diagrams of retrospective images according to an embodiment of the invention.
Fig. 3 is a flowchart of a picture backtracking method of a display device according to an embodiment of the invention.
Reference numerals illustrate:
10: host machine
11: image signal
20: user' s
100: display device
110: display controller
111: image scaler
112: time sequence controller
120: display module
130: storage device
131: firmware
132: on-screen display interface
140: image buffer
141: a first storage space
142: a second storage space
150: transmission interface
160: input interface
161: entity button
162: five-way control rod
1631-1633: function key
170: multiplexer
171-172: path
202. 204, 206: retrospective image
211: time series
S310 to S320: step (a)
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Fig. 1 is a block diagram of a display device according to an embodiment of the invention.
As shown in fig. 1, the host 10 is signally connected to the display device 100. For example, the host 10 may be a personal computer, a server, a television stick/box, a set-top box, a game machine, a DVD/blu-ray player, or other devices with image output function. The display device 100 may be, for example, a flat panel display, a television, a projector, a computer screen, etc., but the present invention is not limited thereto. The display device 100 includes a display controller 110, a display module 120, a storage device 130, an image buffer 140, a transmission interface 150, an input interface 160 and a multiplexing circuit 170.
The display controller 110 may be, for example, an application-oriented integrated circuit (application-specific integrated circuit), a System-on-chip (System-on-chip), a processor, or a microcontroller (microcontroller), but the present invention is not limited thereto.
The display module 120 may be, for example, a liquid crystal (liquid crystal) panel (including a backlight module), a light-emitting diode (light-emitting diode) panel, an organic light-emitting diode (organic light-emitting diode) panel, a cathode ray tube (cathode tube), an electronic Ink (E-Ink) display module, an electroluminescent (electroluminescent) display module, a Plasma (Plasma) display module, a projection (projection) display module, a Quantum Dot (Quantum Dot) display module, but the present invention is not limited thereto.
The memory device 130 may be a non-volatile memory such as Read Only Memory (ROM), erasable Programmable Read Only Memory (EPROM), electrically Erasable Programmable Read Only Memory (EEPROM), for example. The storage device 130 is used for storing firmware 131 associated with the display device 100. The storage device 130 may be external to the display controller 110, or may be integrated into the display controller 110, for example.
The firmware 131 includes, for example, display settings and extended display capability identification data (Extended Display Identification Data, EDID) of an on-screen display interface of the display device 100, display settings, one or more on-screen-display (OSD) interfaces 132. The extended display capability identification data includes, for example, a manufacturer of the display device 100, a product name, a resolution, a display frame number per second, and the like. The display settings include, for example, settings of brightness, contrast, sharpness, color temperature, and the like of the display device 100.
The transmission interface 150 may include a wired transmission interface and/or a wireless transmission interface, wherein the wired transmission interface may include: a high-resolution multimedia interface (High Definition Multimedia Interface, HDMI), a Display Port (DP) interface, an embedded display port (impregnated DisplayPort, eDP), an interface universal serial bus (Universal Serial Bus, USB) interface, a USB Type-C interface, a Lei Li (Thunderbolt) interface, a Digital Video Interface (DVI), a Video Graphics Array (VGA) interface, a general purpose input-output (GPIO) interface, a universal asynchronous receiver-transmitter (UART) interface, a Serial Peripheral Interface (SPI) interface, an integrated circuit bus (I2C) interface, or a combination thereof, and the wireless transmission interface may include: bluetooth (Bluetooth), wiFi, near Field Communication (NFC) interfaces, etc., but the invention is not limited thereto.
In one embodiment, the display controller 110 may read the firmware 131 stored in the storage device 130 and the program codes of the on-screen display interface 132 through a bus (e.g., an I2C bus), and set the relevant display parameters accordingly. In addition, the display controller 110 may also transmit the extended display capability identification data of the display device 100 to the host 10 through the transmission interface 150, so that the host 10 can set the resolution of the image signal to be outputted and the related synchronization signal. The on-screen display interface 132 includes, for example, an on-screen display Menu (OSD Menu) and options, an information display interface (information dashboard), a timer, a counter, a sight (cross share), a specific symbol, a specific color, a specific text, or a combination thereof, but the present invention is not limited thereto.
In one embodiment, the display controller 110 includes an image scaler (image scaler) 111 and a timing controller (timing controller) 112. The display controller 110 receives the image signal from the host 10 and/or the image signals from other hosts through the transmission interface 150, and the image scaler 111 performs an image scaling process and/or an image superimposition process on the image in the received image signal 11 to conform to the resolution of the display module 120, and stores the image (e.g. referred to as an output image) after the image scaling process in the image buffer 140. The timing controller 112 controls the display module 120 to read the output image from the image buffer 140 and play the output image.
In another embodiment, the display controller 110 may include the timing controller 112, and the resolution of the image signal 11 from the host 10 is consistent with the resolution of the display module 120, so the display controller 110 may store the image signal in the image buffer 140 without performing the image scaling process after receiving the image signal from the host 10. The timing controller 120 can read the output image from the image buffer 140 and control the display module 120 to play the output image.
The image buffer 140 may be, for example, a volatile memory (e.g., a dynamic random access memory) or a nonvolatile memory (e.g., a flash memory) for storing the image signal 11 from the host 10 or storing the image signal 11 compressed by the display controller 110, and may store the image signal for a predetermined time (e.g., 10 minutes or more) for the image trace-back function of the display device 100.
For example, the image buffer 140 includes a first storage space 141 and a second storage space 142. When the display device 100 receives the image signal 11 from the host 10 through the transmission interface 150, the multiplexer 170 transmits the image signal 11 to the display controller 110 through the path 171 and/or writes the image signal 11 to the first storage space 141 of the image buffer 140 through the path 172. The first storage space 140 is used as an output image buffer in a normal frame mode, and the second storage space 142 is used as an output image buffer in a frame trace-back mode.
The input interface 160 is used for controlling the on/off of the screen display menu and the screen backtracking function of the display device 100. In some embodiments, the input interface 160 may be implemented by a five-way joystick 162 or by five physical buttons 161, thereby implementing up, down, left, right, and confirm commands. In addition, the input interface 160 further includes one or more function buttons 1631-1633, wherein the function button 1632 is used for turning on or off the screen backtracking function of the display device 100, and the function buttons 1631 and 1632 perform the functions of screen backwinding (rewind) and screen backward (forward).
In one embodiment, when the user performs one of the five-way control levers 162 (or presses one of the physical buttons 161), the display controller 110 may read the firmware 132 and the program codes of the on-screen display menu and related options in the on-screen display interface 132 from the storage device 130 and display the menu and related options on the display module 120.
In another embodiment, the display device 100 of the present invention is not limited to the operation screen backtracking function using the function buttons 1631-1633. The user can also operate the on-screen display interface 132 related to the picture backtracking function through the input interface 160, and can operate the physical button 161 or the five-way control lever 162 in the input interface 160 to control the on/off of the picture backtracking function, the picture backwinding and picture backward functions, and the like.
In some embodiments, the display controller 100 uses a first-in first-out (first-out) mechanism to store the image signal 11 (or compressed image signal) into the second storage space 142 in the image buffer 140. For example, the host 10 or the display device 100 may preset the capacity of the second storage space 142 of the image buffer 140, which corresponds to the number of storable output images, that is, the number may be converted into the time length of the image signal of the picture backtracking function.
In detail, in some embodiments, the display controller 100 may directly store the output image (e.g. RGB image) for the picture backtracking function in the second storage space 142. When the picture tracing function of the display device 100 is turned on, the display controller 100 can directly take out the trace image of the trace time point to be played from the second storage space 142 by using the control signal of the picture tracing function, and play the trace image on the display module 120.
In other embodiments, the display controller 100 performs image compression (or video compression) on the image signal 11 for the picture tracing function to obtain a compressed image, and stores the compressed image in the second storage space 142. When the picture tracing function of the display device 100 is turned on, the display controller 100 can utilize the control signal of the picture tracing function to directly take out the compressed image corresponding to the tracing time point to be played from the second storage space 142, decompress the compressed image to obtain the tracing image to be played on the display module 120, and play the tracing image on the display module 120.
It should be noted that, whether the display controller 110 performs image compression on the image signal to be stored in the second storage space 142 or not, the display controller 110 uses a first-in first-out mechanism to store the image signal or the compressed image signal in the second storage space 142. In other words, when the total capacity of the stored video signals or compressed video signals exceeds the capacity of the second storage space 142, the display controller 110 deletes the video signal or compressed video signal with the earliest predetermined time point in the second storage space 142, and writes the video signal or compressed video signal with the latest time point into the second storage space 142.
When the user starts the image trace-back function of the display device 100 at the time point T1 through the function button 1632 or the on-screen display interface 132, it means that the display controller 110 starts to play the trace-back image signal on the display module 120 at the time point T1, so that the user does not need to view the image from the host 10 temporarily. At this time, the switch circuit (not shown) in the multiplexer 170 receives the trigger signal of the picture tracing function from the input interface 160 to disconnect the path 172, i.e. the display controller 110 will not write the image signal 11 from the host 10 into the second storage space 142 at the time point T1. If the user starts the screen trace-back function of the display device 100 at the time point T1, the user can only search the trace-back image within the predetermined time interval before the time point T1 through the function key 1631. When the display device 100 is in the screen backtracking mode and the user searches for the backtracking image through the function button 1633, the display controller 110 can only search for the backtracking image at the time point T1.
In some embodiments, if the display device 100 is in the screen backtracking mode, each time the user presses the function button 1631 once and releases it, the display controller 110 will go a predetermined number of seconds (e.g. 5 seconds or 10 seconds) before the current search time point to obtain a backtracking image of the corresponding search time point, and set the current search time point as the time point corresponding to the backtracking image. After the user continues to hold the function button 1631 for more than a predetermined number of seconds (e.g., 2 seconds), the display controller 110 will continuously and rapidly search for the retrospective image from the current search time point. When the user releases the function button 1631, the display controller 110 stops searching for the retrospective image.
Similarly, each time the user presses the function button 1633 once and releases, the display controller 110 will obtain the retrospective image of the corresponding search time point a predetermined number of seconds (e.g. 5 seconds or 10 seconds) from the current search time point, and set the current search time point as the time point corresponding to the retrospective image. After the user continues to hold the function button 1633 for more than a predetermined number of seconds (e.g., 2 seconds), the display controller 110 will continuously and rapidly search back for the retrospective image from the current search time point. When the user releases the function button 1633, the display controller 110 stops searching for the retrospective image.
Fig. 2A-2C are schematic diagrams illustrating backtracking pictures according to an embodiment of the invention. Please refer to fig. 1 and fig. 2A-2C simultaneously.
Assume that the user is at time 09:35 (i.e. time T1), when the function key 1632 is used to activate the screen trace-back function of the display device 100, the display controller 110 will first obtain the first data from the second memory space 142 at time 09:35, and playing the retrospective image 202 on the display module 120, wherein the retrospective image 202 includes a time line 211 for displaying a time point corresponding to the retrospective image 202, and the user 20 faces forward at this time, as shown in fig. 2A.
Assuming that the second storage space 142 of the display device 110 can store the image signal with the length of at most 10 minutes, when the user continues to trace back the image through the function key 1631, the display controller 110 can obtain the image signal at most at the time 09: ten minutes before 35, trace back image 204. The retrospective image 204 also includes a time line 211 for displaying a corresponding time point of the retrospective image 204, and the user 20 faces to the left as shown in fig. 2B.
Next, when the user performs the screen search backward through the function key 1633, the display controller 110 can search backward to the time 09 at most: 35. If the user views the button 1633 back at time 09:31, the retrospective image 206 also includes a time line 211 for displaying the corresponding time point of the retrospective image 206, and the user 20 faces backward at this time, as shown in fig. 2C.
It should be noted that there is still a time limitation when the user searches for the screen forward or backward through the function key 1631 or 1633. In detail, the forward search can only search for the retrospective image within a predetermined time interval (for example, 10 minutes) before the time point T1 at most. The backward search can only search backward for the retrospective image up to the time point T1 from the earliest time point before the predetermined time interval of the time point T1 (i.e., ten minutes before the time point T1) at most.
Fig. 3 is a flowchart of a picture backtracking method of a display device according to an embodiment of the invention. Please refer to fig. 1 and fig. 3 simultaneously.
In step S310, the display controller 110 receives the video signal 11 from the host 10 and stores the video signal 11 in the video buffer 140. For example, in some embodiments, the display controller 100 may directly store the output image (e.g. RGB image) for the picture backtracking function in the second storage space 142. When the picture tracing function of the display device 100 is turned on, the display controller 100 can directly take out the tracing image signal of the tracing time point to be played from the second storage space 142 by using the control signal of the picture tracing function, and play the tracing image signal on the display module 120.
In other embodiments, the display controller 100 performs image compression (or video compression) on the image signal 11 for the picture tracing function to obtain a compressed image, and stores the compressed image in the second storage space 142. When the picture tracing function of the display device 100 is turned on, the display controller 100 can utilize the control signal of the picture tracing function to directly take out the compressed image corresponding to the tracing time point to be played from the second storage space 142, decompress the compressed image to obtain the tracing image to be played on the display module 120, and play the tracing image on the display module 120.
In step S312, it is determined whether a trigger signal is received. When it is determined that the trigger signal is received, step S314 is performed. When it is determined that the trigger signal is not received, the process returns to step S312. For example, the function key 1632 of the input interface 160 is used to turn on or turn off the screen trace back function of the display device 100, i.e. when the user presses the function key 1632 and releases it, the function key 1632 can generate a trigger signal to transmit to the multiplexer 170 and the display controller 110.
In step S314, the display apparatus 100 enters a screen backtracking mode. For example, in response to receiving the trigger signal (e.g. at time T1), the display controller 110 controls the display device 100 to enter the picture backtracking mode, and the switch circuit 172 of the multiplexer 170 breaks the path, i.e. the display controller 110 does not write the image signal 11 from the host 10 into the second storage space 142 at time T1. If the user starts the screen trace-back function of the display device 100 at the time point T1, the user can only search the trace-back image within the predetermined time interval before the time point T1 through the function key 1631. When the display device 100 is in the screen backtracking mode and the user searches for the backtracking image through the function button 1633, the display controller 110 can only search for the backtracking image at the time point T1.
In step S316, the display controller 111 fetches the image signals corresponding to the time from the image buffer according to the user command. For example, when the display device 100 is in the picture backtracking mode, the user can operate the function key 1631 or 1633 or the input interface 160 to turn on the on-screen display 132 related to the picture backtracking function, and can operate the physical button 161 or the five-way control lever 162 in the input interface 160 to control the on/off of the picture backtracking function, and the picture backwinding and picture backward functions. In some embodiments, when the picture tracing function of the display device 100 is turned on, the display controller 100 can directly take the trace image of the trace time point to be played out of the second storage space 142 by using the control signal of the picture tracing function, and play the trace image on the display module 120. In other embodiments, when the picture tracing function of the display device 100 is turned on, the display controller 100 can directly take out the compressed image corresponding to the tracing time point to be played from the second storage space 142 by using the control signal of the picture tracing function, and decompress the compressed image to obtain the tracing image to be played on the display module 120, and play the tracing image on the display module 120.
In step S318, it is determined whether a trigger signal is received. When it is determined that the trigger signal is received, step S320 is performed. When it is determined that the trigger signal is not received, the process returns to step S316. For example, the trigger signal is used to switch the normal mode or the trace-back mode of the display device 100. When the display device 100 is in the picture backtracking mode, if the display controller 110 determines that the trigger signal is received again, the display controller 110 controls the display device 100 to enter the normal picture mode.
In step S320, the display apparatus 100 enters a normal screen mode. For example, the first storage space 140 is used as an output image buffer in a normal frame mode. That is, in the normal screen mode, the display controller 110 obtains the output image from the first storage space 141 and plays the output image on the display module 120.
In summary, the present invention provides a display device and a picture tracing method thereof, and a user can browse a screen picture within a predetermined time interval by using a picture tracing function built in the display device, so as to help the user recall a previously executed operation on a host or browse a previously viewed picture by the user, thereby increasing user experience.
In the claims, the terms "first," "second," "third," and the like are used for modifying elements of the claims, and are not intended to indicate a precedence order or precedence relationship over one element over another or the temporal order in which steps of a method are performed, but are used to distinguish between elements having the same name.
While the present invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (16)

1. A display device, comprising:
an image buffer;
a display module; and
a display controller for receiving an image signal from a host and storing the image signal in the image buffer;
wherein, in response to the display controller receiving a trigger signal, the display controller controls the display device to enter a picture backtracking mode,
the display controller takes out the backtracking image corresponding to the backtracking time point from the image buffer according to a user instruction, and plays the backtracking image on the display module.
2. The display device of claim 1, wherein the display controller compresses the video signal to obtain a compressed video signal and stores the compressed video signal in the video buffer,
when the display device is in the picture backtracking mode, the display controller obtains the compressed image signal corresponding to the backtracking time point from the image buffer, and decompresses the compressed image signal to obtain the backtracking image.
3. The display device of claim 2, wherein the video buffer stores the compressed video signal for a predetermined time interval, and the display controller uses a first-in first-out mechanism to store the compressed video signal to the video buffer.
4. The display device of claim 1, further comprising: the input interface comprises a first function key, a second function key and a third function key, wherein the second function key is used for generating the trigger signal to start or stop the picture backtracking mode of the display device, and the first function key and the third function key are used for generating the user instruction and respectively controlling the picture backwinding function and the picture backward function in the picture backtracking mode.
5. The display device according to claim 4, wherein when the display device is in the picture backtracking mode and a user presses the first function key or the third function key and releases the first function key, the display controller goes forward or backward from a current search time point by a predetermined number of seconds to obtain the backtracking time point, and obtains the backtracking image corresponding to the backtracking time point from the image buffer.
6. The display device of claim 4, wherein the display controller searches for the retrospective image from a current search time point rapidly forward or backward when the display device is in the picture retrospective mode and a user keeps pressing the first function key or the third function key.
7. The display device of claim 4, wherein the display controller controls the display device to return to a normal screen mode when the display device is in the screen backtracking mode and the display controller receives the trigger signal from the second function key.
8. The display device of claim 1, wherein the display controller stops writing the video signal to the video buffer in response to the display device entering the picture backtracking mode.
9. A picture backtracking method of a display device, wherein the display device includes an image buffer, a display module and a display controller, the method includes:
receiving an image signal from a host by using the display controller, and storing the image signal in the image buffer;
responding to the display controller receiving a trigger signal, controlling the display device to enter a picture backtracking mode by using the display controller; and
the display controller is utilized to take out the backtracking image corresponding to the backtracking time point from the image buffer according to a user instruction, and the backtracking image is played on the display module.
10. The picture backtracking method of a display device of claim 9, further comprising:
firstly compressing the image signal by using the display controller to obtain a compressed image signal, and storing the compressed image signal into the image buffer;
when the display device is in the picture backtracking mode, the display controller is utilized to acquire the compressed image signal corresponding to the backtracking time point from the image buffer, and decompresses the compressed image signal to obtain the backtracking image.
11. The picture tracing method according to claim 9, wherein the image buffer stores the compressed image signal within a predetermined time interval, and the method further comprises: the compressed image signal is stored in the image buffer by the display controller using a first-in first-out mechanism.
12. The picture backtracking method of a display device of claim 9, wherein the display device further comprises: the input interface comprises a first function key, a second function key and a third function key, wherein the second function key is used for generating the trigger signal to start or stop the picture backtracking mode of the display device, and the first function key and the third function key are used for generating the user instruction and respectively controlling the picture backwinding function and the picture backward function in the picture backtracking mode.
13. The picture backtracking method of a display device of claim 12, further comprising:
when the display device is in the picture backtracking mode and a user presses the first function key or the third function key and releases the first function key, the display controller is utilized to obtain the backtracking time point from the current searching time point by a preset second number before or after the current searching time point, and the backtracking image corresponding to the backtracking time point is obtained from the image buffer.
14. The picture backtracking method of a display device of claim 12, further comprising:
when the display device is in the picture backtracking mode and a user continuously presses the first function key or the third function key, the display controller is utilized to quickly search the backtracking image forward or backward from the current searching time point.
15. The picture backtracking method of a display device of claim 12, further comprising:
when the display device is in the picture backtracking mode and the display controller receives the trigger signal from the second function key, the display controller is utilized to control the display device to return to the normal picture mode.
16. The picture backtracking method of a display device of claim 9, further comprising:
and stopping writing the image signal into the image buffer by using the display controller in response to the display device entering the picture backtracking mode.
CN202111563877.8A 2021-12-20 2021-12-20 Display device and picture backtracking method thereof Pending CN116301681A (en)

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