CN114115785A - Display and method for realizing display interaction function simultaneously by wireless screen projection - Google Patents

Display and method for realizing display interaction function simultaneously by wireless screen projection Download PDF

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Publication number
CN114115785A
CN114115785A CN202111675818.XA CN202111675818A CN114115785A CN 114115785 A CN114115785 A CN 114115785A CN 202111675818 A CN202111675818 A CN 202111675818A CN 114115785 A CN114115785 A CN 114115785A
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display
intelligent terminal
image processing
processing chip
module
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郭松恒
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Shenzhen Anping Technology Co ltd
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Shenzhen Anping Technology Co ltd
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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
    • G06F3/1454—Digital output to display device ; Cooperation and interconnection of the display device with other functional units involving copying of the display data of a local workstation or window to a remote workstation or window so that an actual copy of the data is displayed simultaneously on two or more displays, e.g. teledisplay
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/382—Information transfer, e.g. on bus using universal interface adapter
    • G06F13/385—Information transfer, e.g. on bus using universal interface adapter for adaptation of a particular data processing system to different peripheral devices
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/40—Bus structure
    • G06F13/4063—Device-to-bus coupling
    • G06F13/4068—Electrical coupling
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
    • G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
    • 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
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/011—Arrangements for interaction with the human body, e.g. for user immersion in virtual reality
    • 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
    • G06F3/147—Digital output to display device ; Cooperation and interconnection of the display device with other functional units using display panels
    • 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
    • G06F3/16—Sound input; Sound output
    • G06F3/162—Interface to dedicated audio devices, e.g. audio drivers, interface to CODECs
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/35—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F2213/0042—Universal serial bus [USB]

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • Computer Hardware Design (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Multimedia (AREA)
  • General Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Health & Medical Sciences (AREA)
  • Controls And Circuits For Display Device (AREA)

Abstract

The invention provides a display for realizing a display interaction function while wirelessly projecting a screen, which comprises a drive board body, wherein the drive board body is provided with a display image processing chip, a liquid crystal panel, an interface module, a USB interface module and a Linux processor module, wherein the liquid crystal panel, the interface module, the USB interface module and the Linux processor module are connected with the display image processing chip, and the display has the beneficial effects that: the drive plate body can be used with the intelligent terminal in a matched mode, control information of video/sound/human-computer interaction equipment in the intelligent terminal is transmitted to the drive plate through a wireless network, audio and video decoding and forwarding of control information of USB human-computer interaction equipment are achieved through the LINUX module of the drive plate, the audio and video are output to the image processing chip through the HDMI after being decoded, then the liquid crystal panel is directly driven by the image processing chip, images in the intelligent terminal are displayed on the display equipment, when the images of the intelligent terminal are displayed on the display, interactive operation between the USB peripheral equipment and the intelligent terminal is achieved through the LINUX system through the uibc protocol.

Description

Display and method for realizing display interaction function simultaneously by wireless screen projection
Technical Field
The invention relates to the technical field of displays, in particular to a display and a method for realizing a display interaction function simultaneously by wireless screen projection.
Background
At present, intelligent electronic devices represented by mobile phones and computers support wireless screen projection, and the realization of a display function is far from insufficient for users, so that a matched display or other commercial display devices are urgently needed to support wireless screen projection, and simultaneously, a keyboard/mouse/touch screen interaction function can be realized in a wireless mode, and the intelligent devices can be operated through a terminal display device end, namely, so-called back control, and the traditional solution is as follows: the wireless screen of throwing only solves the demonstration problem, and keyboard mouse touch-sensitive screen passes through the bluetooth and connects, and the drawback of operation like this is: the operation is complicated, the screen is firstly projected, and then the Bluetooth is connected, and the two steps are carried out;
the screen projection and the Bluetooth peripheral are respectively two different communication interfaces, so that the screen projection and the Bluetooth peripheral can be displayed and closed, the touch screen can still work, the touch equipment can be connected, the graphic signal can not be projected, and the confusion and inconvenience are brought to users.
Disclosure of Invention
The invention aims to solve the defects of the technical problems and provides a novel display and a method for realizing a display interaction function simultaneously by wireless screen projection.
The invention is realized by the following technical scheme:
a display for realizing wireless screen projection and display interaction function at the same time comprises a driving board body, wherein a display image processing chip, a liquid crystal panel connected with the display image processing chip, an interface module, a USB interface module and a Linux processor module are arranged on the driving board body, the display image processing chip is internally provided with a Linux system, the liquid crystal panel, the interface module and the USB interface module are electrically connected with the display image processing chip, the Linux processor module is electrically connected with the display image processing chip, and after the Linux processor module decodes the image input by the intelligent terminal, the intelligent terminal image processing method comprises the steps that the intelligent terminal image is input into a display image processing chip through an HDMI interface, the display image processing chip transmits an image input by the intelligent terminal to a liquid crystal display through a port of a liquid crystal panel or is directly connected with the display through a data line which can be used for charging the intelligent terminal through a Linux processor module.
Furthermore, the device also comprises a Type-C/USB/HDMI conversion module, wherein the Type-C/USB/HDMI conversion module is electrically connected with the display image processing chip.
Furthermore, the Type-C/USB/HDMI conversion module is matched with the intelligent terminal for use, images and sounds in the intelligent terminal are transmitted to the Type-C/USB/HDMI conversion module on the drive plate body through the same-screen input interfaces of various intelligent terminals, and a display image processing chip on the drive plate body processes data of the images and the sounds received by the intelligent terminal.
Further, the interface module includes, but is not limited to, a TYPEC interface, an HDMI interface, a TYPEC interface power supply.
Further, the USB interface module includes, but is not limited to, a wireless network card USB interface, a keyboard USB interface, a mouse USB interface, and a touch screen USB interface.
Further, the model of the display image processing chip is RTD 2556.
Further, the model of the Linux processor module is AM 8271.
Furthermore, the intelligent terminal is a computer, a notebook computer, an intelligent mobile phone and a tablet.
The system further comprises a human-computer interaction device control information module, wherein the human-computer interaction device control information module is electrically connected with the interface module and the USB interface module; the human-computer interaction equipment control information module comprises but is not limited to a mouse, a keyboard and a touch screen.
A method for realizing display interaction function while wireless screen projection comprises the following steps:
s1: the driving board body is matched with an intelligent terminal for use, images and sounds in the intelligent terminal are transmitted to a Type-C/USB/HDMI conversion module on the driving board body through an intelligent terminal same-screen input interface module and a USB interface module, and the driving board body processes data of the images and the sounds received by the intelligent terminal;
s2: processing the data of the image and the sound of the intelligent terminal according to the driving board body in the S1, storing the processed data in a Linux processor module, loading a Linux system in the Linux processor module, and decoding the image input by the intelligent terminal by the Linux processor module;
s3: according to the Linux processor module in the S2, the image input by the intelligent terminal is decoded and then connected with the drive board body through the intelligent terminal, the image and the sound in the intelligent terminal are transmitted to the display image processing chip through the Type-C/USB/HDMI conversion module on the drive board body, then the image and the sound received in the intelligent terminal are processed, and the Linux system has a protocol to identify and transmit the intelligent terminal data to the Linux system;
s4: recognizing and transmitting the intelligent terminal data to the Linux system according to the protocol of the Linux system in the S3, and inputting the intelligent terminal data to the display image processing chip through the HDMI;
s5: and processing the input images and sounds according to the display image processing chip in the step S4, wherein after the processing, the display image processing chip transmits the images input by the intelligent terminal to the display device through the port of the liquid crystal panel, and plays the images and sounds in the intelligent terminal out of the display device.
The invention has the beneficial effects that:
(1) only wireless screen projection operation is needed, and after the screen is projected according to the wireless screen projection operation mode, the keyboard/mouse/touch screen and other external devices are immediately available;
(2) for a user, the host can be operated through the display terminal through one-time screen projection operation, the host can be regarded as a whole, the peripheral equipment can be immediately available through one-time screen projection, and the peripheral equipment cannot be immediately available after the screen projection is disconnected;
(3) the drive plate body can be used with the intelligent terminal cooperation, image and sound in the intelligent terminal are through various intelligent terminal with screen input interface module, USB interface module, transmit the Type-C USB/HDMI conversion module on the drive plate body, the drive plate body is handled data such as intelligent terminal image and sound received, the Linux system has agreement discernment and transmits intelligent terminal data, then export for display device through the HDMI interface, make image and sound in the intelligent terminal play from above display device.
[ description of the drawings ]
FIG. 1 is a schematic diagram of a structure of a monitor for simultaneously implementing a line-casting function and a display interaction function according to the present invention;
reference numerals: 1. a drive plate body; 2. a display image processing chip; 3. a liquid crystal panel; 4. an interface module; 41. a TYPEC interface; 42. an HDMI interface; 43. power is supplied through a TYPEC interface; 5. a USB interface module; 51. a wireless network card USB interface; 52. a keyboard USB interface; 53. a USB interface of the mouse; 54. a touch screen USB interface; 6. a Linux processor module.
Detailed Description
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different objects and not for describing a particular order.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Embodiment 1, referring to fig. 1, a display for wireless screen projection and display interaction function realization includes a driving board body 1, a display image processing chip 2, a liquid crystal panel 3 connected to the display image processing chip 2, an interface module 4, a USB interface module 5, and a Linux processor module 6 are disposed on the driving board body 1, the Linux system is mounted in the display image processing chip 4, the liquid crystal panel 3, the interface module 4, and the USB interface module 5 are electrically connected to the display image processing chip 2, the Linux processor module 6 is electrically connected to the display image processing chip 2, the Linux processor module 6 decodes an image input by an intelligent terminal, and inputs the image to the display image processing chip 2 through an HDMI interface 42, the display image processing chip 2 transmits the image input by the intelligent terminal to the display through a port of the liquid crystal panel 3, the data line for charging the intelligent terminal can be directly connected with the display through the Linux processor module 6.
Preferably, the device further comprises a Type-C/USB/HDMI conversion module, and the Type-C/USB/HDMI conversion module is electrically connected with the display image processing chip.
Preferably, the Type-C/USB/HDMI conversion module is used in cooperation with the intelligent terminal, images and sounds in the intelligent terminal are transmitted to the Type-C/USB/HDMI conversion module on the drive board body through the same-screen input interfaces of various intelligent terminals, and the display image processing chip on the drive board body processes the received data such as the images and sounds of the intelligent terminal.
Preferably, the interface module 4 includes, but is not limited to, a TYPEC interface 41, an HDMI interface 42, and a TYPEC interface power supply 43, the TYPEC interface 41 is electrically connected to the display image processing chip 2 through a DP display signal, the HDMI interface 42 is electrically connected to the display image processing chip 2 through an HDMI-1, and the TYPEC interface power supply 43 is electrically connected to the Linux processor module 6 through a USB D + D-.
Preferably, the USB interface module 5 includes, but is not limited to, a wireless network card USB interface 51, a keyboard USB interface 52, a mouse USB interface 53, and a touch screen USB interface 54.
Based on the above embodiment, the present embodiment may further include a wireless network card, the wireless network card is inserted into the USB interface of the wireless network card, and the display may be connected to an intelligent electronic module with a wireless module, such as an intelligent terminal, through the wireless network card, so as to wirelessly project an image of the intelligent terminal onto the display.
Preferably, the model of the display image processing chip 2 is RTD 2556.
Preferably, the model of the Linux processor module 6 is AM 8271.
Preferably, the intelligent terminal is a computer, a notebook computer, a smart phone or a tablet.
Preferably, the system also comprises a human-computer interaction device control information module, wherein the human-computer interaction device control information module is electrically connected with the interface module and the USB interface module; the human-computer interaction equipment control information module comprises but is not limited to a mouse, a keyboard and a touch screen.
Embodiment 2, referring to fig. 1, a method for implementing a display interaction function while wirelessly projecting a screen includes the following steps:
s1: the driving board body is matched with an intelligent terminal for use, images and sounds in the intelligent terminal are transmitted to a Type-C/USB/HDMI conversion module on the driving board body through an intelligent terminal same-screen input interface module and a USB interface module, and the driving board body processes data of the images and the sounds received by the intelligent terminal;
s2: processing the data of the image and the sound of the intelligent terminal according to the driving board body in the S1, storing the processed data in a Linux processor module, loading a Linux system in the Linux processor module, and decoding the image input by the intelligent terminal by the Linux processor module;
s3: according to the Linux processor module in the S2, the image input by the intelligent terminal is decoded and then connected with the drive board body through the intelligent terminal, the image and the sound in the intelligent terminal are transmitted to the display image processing chip through the Type-C/USB/HDMI conversion module on the drive board body, then the image and the sound received in the intelligent terminal are processed, and the Linux system has a protocol to identify and transmit the intelligent terminal data to the Linux system;
s4: recognizing and transmitting the intelligent terminal data to the Linux system according to the protocol of the Linux system in the S3, and inputting the intelligent terminal data to the display image processing chip through the HDMI;
s5: and processing the input images and sounds according to the display image processing chip in the step S4, wherein after the processing, the display image processing chip transmits the images input by the intelligent terminal to the display device through the port of the liquid crystal panel, and plays the images and sounds in the intelligent terminal out of the display device.
Embodiment 3, refer to fig. 1, a screen is thrown to line realizes showing display interaction function's display simultaneously, only need dispose a standard interface module, USB interface module, just enough make the display utilize the data line that corresponds with intelligent terminal can realize throwing the screen and be connected, this display throws the screen commonality good, for example, the apple user has certainly the charging wire, the charging wire inserts USB interface module and just can show, throw the screen when the customer needs the distance, can the option realize wireless throwing the screen through wireless network card and connect, it is more convenient, in a flexible way to use. The scheme greatly simplifies the using operation steps of a user, and meanwhile, vertical screen display can be realized by writing an image rotating program into the Linux processor module, so that the requirement of live broadcast platforms such as a tremble and the like for vertical screen display is met.
Appropriate changes and modifications to the embodiments described above will become apparent to those skilled in the art from the disclosure and teachings of the foregoing description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims (10)

1. The utility model provides a wireless screen projecting realizes showing display interaction function's display simultaneously which characterized in that: the intelligent terminal comprises a drive board body, wherein a display image processing chip, a liquid crystal panel, an interface module, a USB interface module and a Linux processor module are arranged on the drive board body, the liquid crystal panel, the interface module, the USB interface module and the display image processing chip are connected with the display image processing chip, the Linux processor module is electrically connected with the display image processing chip, a Linux system is loaded in the Linux processor module, the Linux processor module decodes an image input by the intelligent terminal and inputs the image into the display image processing chip through an HDMI interface, and the display image processing chip transmits the image input by the intelligent terminal to a liquid crystal screen through a port of the liquid crystal panel or can be directly connected with a display through a data line for charging the intelligent terminal through the Linux processor module.
2. The display for realizing the display interaction function by wireless screen projection according to claim 1, wherein: still include Type-C USB/HDMI conversion module, Type-C USB/HDMI conversion module with display image processing chip electric connection.
3. The display for realizing the display interaction function by wireless screen projection according to claim 2, wherein: the Type-C/USB/HDMI conversion module is matched with the intelligent terminal for use, images and sound in the intelligent terminal are transmitted to the Type-C/USB/HDMI conversion module on the drive plate body through the same-screen input interfaces of various intelligent terminals, and a display image processing chip on the drive plate body processes data of the images and the sound received by the display image processing chip.
4. The display for realizing the display interaction function by wireless screen projection according to claim 1, wherein: the interface module comprises but is not limited to a TYPEC interface, an HDMI interface and a TYPEC interface power supply.
5. The display for realizing the display interaction function by wireless screen projection according to claim 1, wherein: the USB interface module comprises but is not limited to a wireless network card USB interface, a keyboard USB interface, a mouse USB interface and a touch screen USB interface.
6. The display for realizing the display interaction function by wireless screen projection according to claim 1, wherein: the model of the display image processing chip is RTD 2556.
7. The display for realizing the display interaction function by wireless screen projection according to claim 1, wherein: the model of the Linux processor module is AM 8271.
8. The display for realizing the display interaction function by wireless screen projection according to claim 1, wherein: the intelligent terminal is a computer, a notebook computer or an intelligent mobile phone.
9. The display for realizing the display interaction function by wireless screen projection according to claim 1, wherein: the system also comprises a human-computer interaction equipment control information module which is electrically connected with the interface module and the USB interface module; the human-computer interaction equipment control information module comprises but is not limited to a mouse, a keyboard and a touch screen.
10. A method for wireless screen projection and display interaction function realization, comprising the display of any one of claims 1-8, wherein the method comprises the following steps:
s1: the driving board body is matched with an intelligent terminal for use, images and sounds in the intelligent terminal are transmitted to a Type-C/USB/HDMI conversion module on the driving board body through an intelligent terminal same-screen input interface module and a USB interface module, and the driving board body processes data of the images and the sounds received by the intelligent terminal;
s2: processing the data of the image and the sound of the intelligent terminal according to the driving board body in the S1, storing the processed data in a Linux processor module, loading a Linux system in the Linux processor module, and decoding the image input by the intelligent terminal by the Linux processor module;
s3: according to the Linux processor module in the S2, the image input by the intelligent terminal is decoded and then connected with the drive board body through the intelligent terminal, the image and the sound in the intelligent terminal are transmitted to the display image processing chip through the Type-C/USB/HDMI conversion module on the drive board body, then the image and the sound received in the intelligent terminal are processed, and the Linux system has a protocol to identify and transmit the intelligent terminal data to the Linux system;
s4: recognizing and transmitting the intelligent terminal data to the Linux system according to the protocol of the Linux system in the S3, and inputting the intelligent terminal data to the display image processing chip through the HDMI;
s5: and processing the input images and sounds according to the display image processing chip in the step S4, wherein after the processing, the display image processing chip transmits the images input by the intelligent terminal to the display device through the port of the liquid crystal panel, and plays the images and sounds in the intelligent terminal out of the display device.
CN202111675818.XA 2021-12-31 2021-12-31 Display and method for realizing display interaction function simultaneously by wireless screen projection Pending CN114115785A (en)

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CN202111675818.XA CN114115785A (en) 2021-12-31 2021-12-31 Display and method for realizing display interaction function simultaneously by wireless screen projection

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Application Number Priority Date Filing Date Title
CN202111675818.XA CN114115785A (en) 2021-12-31 2021-12-31 Display and method for realizing display interaction function simultaneously by wireless screen projection

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