CN118885141A - Dual-screen display and control method thereof - Google Patents

Abstract

The invention relates to a double-screen display and a control method thereof, comprising a display driving plate and two display screens; the double-screen display comprises a display driving plate and two display screens; the computer with full-function Type C output or the TYPE C patch cord with the USB2.0/USB3.0 interface can be connected with the double-screen display through the first input interface, the second input interface, the interface control chip and the conversion module through the common Type C cable, so that the connection cost is greatly reduced, and the omitted components enable the structural design of the display to be lighter and thinner; only the interface computer of the normal USB2.0/USB3.0 can be used for drawing; and the display screen also supports the same screen display with the display screen of the host computer or expands the display, thereby improving the office efficiency and enriching the entertainment content.

Description

Dual-screen display and control method thereof

Technical Field

The present invention relates to the technical field of displays, and more particularly to a dual-screen display and a control method thereof.

Background Art

A dual-screen display usually includes two display screens, which are connected to different video sources respectively. The two display screens are generally not directly connected, such as two video output interfaces of a computer. The content displayed on each display screen is independent of the other display screen. The user can process different tasks on the two display screens at the same time. In this case, each display screen will have one or more corresponding data cables connected to the control host. The existing connection cost is relatively high. A dual-screen display with a new structure is now proposed. Only one ordinary data cable is needed to connect the two display screens, which greatly reduces the connection cost.

Summary of the invention

The technical problem to be solved by the present invention is to provide a dual-screen display and a control method thereof in view of the above-mentioned defects of the prior art.

On the one hand, the technical solution adopted by the present invention to solve its technical problem is: a dual-screen display, including a display driver board and two display screens, wherein the display driver board includes a first input interface, a second input interface, a conversion module, a first point screen chip, a second point screen chip, a first output interface and a second output interface; the first input interface and the second input interface are both used to access external input DP signals or USB2.0 signals; the first input interface and/or the second input interface are connected to the interface control chip through an integrated circuit bus; the conversion module converts the DP signal or the USB2.0 signal output by the first input interface into a first HDMI signal or a first VGA signal or The first DP signal is transmitted to the first dot screen chip, and the DP signal or the USB2.0 signal output by the second input interface is converted into a second HDMI signal or a second VGA signal or a second DP signal and transmitted to the second dot screen chip; the first output interface and the second output interface are electrically connected to the two display screens respectively; the first dot screen chip and the second dot screen chip are connected by signal and control the dots of the two display screens respectively; the dual-screen display also includes a power module, which converts the power connected to the first input interface or the second input interface into a DC power supply for the DCDC control voltage output required by the display driver board and the backlight power required by the two display screens;

The dual-screen display of the present invention, wherein the conversion module includes a first PD protocol controller of the interface control chip and a USB to video decoding output device that converts and encodes the signals of the first input interface and the second input interface into HDMI signals or VCG signals respectively; the first PD protocol controller converts the signals connected to the first input interface and the second input interface into charging CC protocol signals, controls the input power supply, and outputs the charging voltage circuit gear;

The dual-screen display of the present invention, wherein the two output interfaces of the USB to video decoding output device are electrically connected to the first dot screen chip and the second dot screen chip respectively, and the converted HDMI signal and the VCG signal are respectively distributed to the first dot screen chip and the second dot screen chip;

The dual-screen display of the present invention, wherein the two DP signals output by the first input interface and the second input interface are respectively connected to the first dot screen chip; the second dot screen chip is signal-connected to the first dot screen chip, for outputting the DP video signal from the first dot screen chip to the second dot screen chip; the two USB2.0 signals output by the first input interface and the second input interface are output as HDMI signals via a USB to video decoding outputter; the first dot screen chip and the second dot screen chip respectively control the dot screen of the first output interface and the second output interface;

The dual-screen display of the present invention, wherein the power module includes an IM2603 power chip and an IM5200 power chip; the IM2603 power chip and the IM5200 power chip are both electrically connected to the first PD protocol controller; the IM2603 power chip is electrically connected to the first dot screen chip through a first DCDC module; the IM5200 power chip is electrically connected to the second dot screen chip through a second DCDC module;

The dual-screen display of the present invention, wherein the USB to video decoding output device comprises a USB-SW module, a USB-HUB module and a USB-8268 module connected in sequence; the first input interface and the second input interface are both electrically connected to the USB-SW module, and the output end of the USB-8268 module converts and outputs an HDMI signal to a dot screen signal of the second dot screen chip;

The dual-screen display of the present invention, wherein the display driver board further comprises a third input interface directly electrically connected to the first dot screen chip; the third input interface is used to access an external input HDMI signal and transmit the HDMI signal to the first dot screen chip dot screen;

The dual-screen display described in the present invention, wherein the display driver board also includes a PD power input interface and a battery interface; the conversion module includes two second PD protocol controllers and two switching chips respectively arranged in the first point screen chip and the second point screen chip; the two second PD protocol controllers are respectively electrically connected to the PD power input interface and the battery interface, and transmit the external power signal to the first point screen chip; the two switching chips are respectively electrically connected to the first input interface and the second input interface, one of the switching chips switches the DP signal or HDMI signal of the first input interface to the first point screen chip, and the other switching chip switches the DP signal or HDMI signal of the second input interface to the second point screen chip;

The dual-screen display of the present invention, wherein the display driver board further comprises an audio amplifier and a speaker electrically connected to the first dot screen chip or the second dot screen chip; the audio amplifier controls the volume of the speaker;

On the other hand, the present invention further discloses a control method for a dual-screen display screen, using any of the dual-screen displays described above, wherein the control method steps are as follows:

The interface control chip detects whether there is a power supply or device plugged into the display driver board. If so, the system is powered or the device is charged through the CC protocol. The integrated circuit bus detects the charging status of the first dot screen chip or the second dot screen chip, as well as the forward and reverse insertion status of the first input interface and the second input interface.

After the first dot screen chip and the second dot screen chip are powered on, they work normally and light up the startup logos of the two display screens;

The conversion module converts the DP signal or USB2.0 signal output by the first input interface into a first HDMI signal or a first VGA signal or a first DP signal and transmits it to the first dot screen chip, and converts the DP signal or USB2.0 signal output by the second input interface into a second HDMI signal or a second VGA signal or a second DP signal and transmits it to the second dot screen chip;

After the first dot screen chip detects the first HDMI signal, the first VGA signal or the first DP signal, it controls the display screen connected thereto to start displaying;

After the second dot screen signal detects the second HDMI signal, the second VGA signal or the second DP signal, the second dot screen signal controls the display screen connected thereto to start displaying.

The beneficial effects of the present invention are as follows: the dual-screen display and the control method thereof are cleverly designed, comprising a display driver board and two display screens; through a first input interface, a second input interface, an interface control chip and a conversion module, a computer with a full-function Type C output or a TYPE C adapter with a USB2.0/USB3.0 interface can be connected to the dual-screen display through an ordinary Type C cable, thereby greatly reducing the connection cost, and the omitted components also make the structural design of the display thinner and lighter; a computer with only a common USB2.0/USB3.0 interface can also output images; it also supports displaying on the same screen as the display screen of a main computer, or extending the display, thereby improving office efficiency and enriching entertainment content.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work:

FIG1 is a circuit diagram of a dual-screen display according to a first embodiment of the present invention;

FIG2 is a logic flow chart of the dual-screen display in FIG1 ;

FIG3 is a circuit diagram of a dual-screen display according to a second embodiment of the present invention;

FIG4 is a logic flow chart 1 of the dual-screen display in FIG3 (TYPE-C input);

FIG5 is a second logic flow chart of the dual-screen display in FIG3 (TYPE-C input + USB2.0 input);

FIG6 is a logic flow chart 3 of the dual-screen display in FIG3 (HDMI input + USB2.0 input);

FIG7 is a circuit diagram of a dual-screen display according to Embodiment 3 of the present invention;

FIG8 is a logic flow chart 1 of the dual-screen display in FIG7 (TYPE-C input);

FIG9 is a second logic flow chart of the dual-screen display in FIG7 (TYPE-C input + USB2.0 input);

FIG10 is a logic flow chart 3 of the dual-screen display in FIG7 (HDMI input + USB2.0 input);

11 is a circuit diagram of a dual-screen display according to Embodiment 4 of the present invention;

FIG12 is a logic flow chart 1 of the dual-screen display in FIG11 (two DP inputs);

FIG13 is a second logic flow chart of the dual-screen display in FIG11 (one DP input + one HDMI input).

DETAILED DESCRIPTION

The terms "first", "second", "third" and "fourth" etc. in the specification and claims of the present invention and the drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

"Multiple" means two or more. "And/or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and/or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character "/" generally indicates that the related objects are in an "or" relationship.

Moreover, the terms "up, down, front, back, left, right, upper end, lower end, longitudinal" and the like indicating directions are all based on the posture and position of the device or equipment described in this solution during normal use.

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be described clearly and completely in combination with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are partial embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

1. Embodiment 1:

A dual-screen display according to a preferred embodiment of the present invention, as shown in FIG1, comprises a display driver board 10 and two display screens, wherein the display driver board 10 comprises a first input interface 11, a second input interface 12, a conversion module, a first dot screen chip 13, a second dot screen chip 14, a first output interface 15 and a second output interface 16; in one embodiment, the first input interface 11 adopts a TYPE-C1 interface, and the second input interface 12 adopts a TYPE-C2 interface; the chip models of the first dot screen chip 13 and the second dot screen chip 14 can adopt RTD2556VD in the prior art; the first output interface 15 and the second output interface 16 both adopt an EDP screen interface that matches the display screen;

Furthermore, the first input interface 11 and the second input interface 12 are both used to access external input DP signals or USB2.0 signals; the first input interface 11 and the second input interface 12 are both connected to the interface control chip 17 through an integrated circuit bus; the conversion module converts the DP signal or USB2.0 signal output by the first input interface 11 into a first HDMI signal or a first VGA signal or a first DP signal and transmits it to the first dot screen chip 13, and converts the DP signal or USB2.0 signal output by the second input interface 12 into a second HDMI signal or a second VGA signal or a second DP signal and transmits it to the second dot screen chip 14; the first output interface 15 and the second output interface 16 are electrically connected to the two display screens respectively; the first dot screen chip 13 and the second dot screen chip 14 are connected by signal and control the dot screens of the two display screens respectively; the dual-screen display also includes a power module 18, the first input interface 11 and The second input interface 12 is electrically connected to the power module 18; the power module 18 converts the power connected to the first input interface 11 or the second input interface 12 into a DC power supply with a DCDC control voltage output required by the display driver board 10 and a backlight power supply required by the two display screens; in one embodiment, the chip model of the interface control chip 17 can be LDR6282 in the prior art; the chip model of the power module 18 can be IM2603 in the prior art; the IM2603 power module 18 supplies power to the first 12V backlight circuit and the first dot screen chip through the first DCDC module; the first 12V backlight circuit outputs backlight power to the first output interface 15; similarly, the IM2603 power module 18 supplies power to the second 12V backlight circuit and the second dot screen chip through the second DCDC module; the second 12V backlight circuit outputs backlight power to the second output interface 16.

In this embodiment, the conversion module includes a first PD protocol controller of the interface control chip 17 and a USB to video decoder output 19 that converts and encodes the signals of the first input interface 11 and the second input interface 12 into HDMI signals or VCG signals respectively; the first PD protocol controller converts the signals connected to the first input interface 11 and the second input interface 12 into charging CC protocol signals, the LDR6282 interface control chip 17 is connected to the TYPE-C1 interface and the TYPE-C2 interface through two integrated circuit buses CC, controls the input power supply through the CC protocol, and outputs the charging voltage circuit gear, wherein the USB to video decoder output 19 can use the SIM768 model in the prior art.

Compared with the prior art, the dual-screen display of the present invention includes a display driver board and two display screens; through the first input interface, the second input interface, the interface control chip and the conversion module, a computer with a full-function Type C output or a TYPE C adapter with a USB2.0/USB3.0 interface can be connected to the dual-screen display through an ordinary Type C cable, which greatly reduces the connection cost, and the saved components also make the structural design of the display thinner and lighter; a computer with only a common USB2.0/USB3.0 interface can also output images; it also supports display on the same screen as the main computer's display screen, or extended display, thereby improving office efficiency and enriching entertainment content.

As shown in FIG2 , a logic diagram of a control method of a dual-screen display screen in this embodiment is shown, wherein the specific steps of the control method are described as follows:

1. First, the LDR6282 interface control chip 17 detects that there is a power supply or device plugged into the display driver board, and completes the system power supply or device charging function through the CC protocol. The integrated circuit bus detection informs the RTD2556VD of the charging status of the first dot screen chip 13 or the second dot screen chip 14, as well as the forward and reverse insertion status of the first input interface 11TYPE-C1 interface and the second input interface 12TYPE-C2 interface;

2. The USB2.0 video conversion interface distributor 19 of SIM768 controls the first dot screen chip 13 and the second dot screen chip 14 of RTD2556VD to work normally after being powered on, and light up two EDP display screens to display the power-on LOGO at the same time;

3. The RTD2556VD first point screen chip 13 or the second point screen chip 14 that transmits the HDMI signal controls the reset control logic circuit of the SIM768USB to video decoding output device 19;

4. After the SIM768 USB to video decoding output device 19 is powered on and reset, it normally recognizes that the USB device is inserted and outputs two video signals (VGA, HDMI) to the RTD2556VD first point screen chip and the second point screen chip at the back end at the same time;

5. After the RTD2556VD first point screen chip and the second point screen chip detect the VGA and HDMI video signals input by the SIM768 USB to video decoding output device 19, the screens are normally turned on and displayed at the same time; 6. The RTD2556VD first point screen chip and the second point screen chip control the menu logic, respectively controlled by two different buttons, which are mutually exclusive; and through serial port communication, as long as one screen displays the OSD menu, the other screen does not display it; thus, through the three same buttons, each OSD menu can be adjusted without interfering with each other.

Furthermore, the above scheme has the following advantages:

1. USB2.0 can output two channels to two screens at the same time, and is compatible with all MAC and WINDOWS computer systems, and is adapted to the respective computer interfaces USB2.0/USB3.0/TYPE-C/Thunderbolt 3/Thunderbolt 4.

2. The USB2.0 decoding video encryption conversion algorithm has a high rate, the system has high-speed DDR memory, the video synchronization display is fast, it occupies low computer memory, and does not slow down the computer system operation; it meets the customer's requirements for fast video refresh, no heat in the computer system, and both high and low configuration computers can output and display smoothly without lag.

3. When two screens are displayed on the same line, the brightness is automatically limited; after the charger is inserted, the brightness is automatically adjusted to facilitate use in various occasions. The extended screen can also charge the computer.

4. The dual screens can expand the display at the same time, or display the same screen at the same time, which is convenient for users to choose and use a variety of display combinations.

5. The OSD menus are adjusted separately without interfering with each other, and the operation is simple; it is convenient for users to operate and adjust.

2. Embodiment 2:

A dual-screen display according to a preferred embodiment of the present invention, as shown in FIG3, comprises a display driver board 10 and two display screens, wherein the display driver board 10 comprises a first input interface 11, a second input interface 12, a conversion module, a first dot screen chip 13, a second dot screen chip 14, a first output interface 15 and a second output interface 16; in one embodiment, the first input interface 11 adopts a TYPE-C1 interface, and the second input interface 12 adopts a TYPE-C2 interface; the chip models of the first dot screen chip 13 and the second dot screen chip 14 can adopt RTD2785T in the prior art; the first output interface 15 and the second output interface 16 both adopt an EDP screen interface that matches the display screen;

Furthermore, the first input interface 11 and the second input interface 12 are both used to access external input DP signals or USB2.0 signals; the first input interface 11 or the second input interface 12 is connected to the interface control chip 17 through an integrated circuit bus, and then converts the externally connected Type C1/C2 signal into a charging CC protocol signal, wherein the model of the interface control chip 17 adopts the LDR6282 in the prior art; the conversion module converts the DP signal or USB2.0 signal output by the first input interface 11 into a first HDMI signal or a first VGA signal or a first DP signal and transmits it to the first point screen chip 13, and converts the DP signal or USB2.0 signal output by the second input interface 12 into a second HDMI signal or a second VGA signal or a second DP signal and transmits it to the second point screen chip 14; the two DP signals output by the first input interface 11 and the second input interface 12 are respectively connected to the first point screen chip 13; the second point screen chip 14 is signal-connected to the first point screen chip 13, and is used to output the DP video signal from the first point screen chip 13 to the second point screen chip 14 ; The two USB2.0 signals output by the first input interface 11 and the second input interface 12 are output as HDMI signals through the USB to video decoding output device 19; the first dot screen chip 13 and the second dot screen chip 14 respectively control the dot screen of the first output interface 15 and the second output interface 16; the first output interface 15 and the second output interface 16 are respectively electrically connected to the two display screens; the first dot screen chip 13 and the second dot screen chip 14 control the dot screen of the two display screens respectively after the signals are connected; the dual-screen display also includes a power module 18, and the first input interface 11 and the second input interface 12 are both electrically connected to the power module 18; the power module 18 converts the power connected to the first input interface 11 or the second input interface 12 into a DC power supply for the DCDC control voltage output required by the display driver board 10 and the backlight power required by the two display screens;

In one embodiment, the conversion module includes a first PD protocol controller of an LDR6282 interface control chip 17, and a USB to video decoder outputter 19 that converts and encodes the signals of the first input interface 11 and the second input interface 12 into HDMI signals or VCG signals respectively; the power module 18 includes an IM2603 power chip 181 and an IM5200 power chip 182; the IM2603 power chip 181 and the IM5200 power chip 182 are both electrically connected to the first PD protocol controller 17; the IM2603 power chip 181 is electrically connected to the first dot screen chip 13 through the first DCDC module 183; the IM5200 power chip 182 is electrically connected to the second dot screen chip 14 through the second DCDC module 184. The DCDC modules are controlled respectively through the IM5200 power chip 182 and the IM2603 power chip 181, and the output system power circuit and the backlight power circuit are output;

Optionally, the system power supply circuit is connected to the power supply connected to the first input interface 11 or the second input interface 12, and includes three DCDC step-down circuits, wherein two DCDC step-down circuits are used to convert the power supply connected to the first input interface 11 or the second input interface 12 into 3.3V, and the other two DCDC step-down circuits are used to convert the power supply connected to the first input interface 11 or the second input interface 12 into 2.8V and 1.8V;

The backlight power supply circuit includes two 12V boost circuits, which are connected to the power supply of the first input interface 11 or the power supply of the second input interface 12. The two boost circuits are used to convert the power supply of the first input interface 11 or the power supply of the second input interface 12 into a 12V power supply, and provide it to the two EDP display screens respectively, wherein the boost circuit is implemented using the boost chip IM5200.

The USB to video decoding output device 19 includes a USB-SW module 191, a USB-HUB module 192 and a USB-8268 module 193 connected in sequence; the first input interface 11 and the second input interface 12 are both electrically connected to the USB-SW module 191, and the output end of the USB-8268 module 193 converts and outputs HDMI signals;

Furthermore, the DP signal of the first input interface 11 or the second input interface 12 is connected to the first dot screen chip 13RTD2785T, and the second dot screen chip 14RTD2785T is connected to the DP signal output port of the first dot screen chip 13RTD2785T, and then the first dot screen chip 13RTD2785T outputs the DP video signal to the second dot screen chip 14RTD2785T; the USB2.0 signal of the first input interface 11 or the second input interface 12 switches the USB2.0 signal to the USB-8268 module 193 through the USB-SW module 191, and outputs the HDMI signal to the second dot screen chip 14RTD2785T; the second dot screen chip 14RTD2785T and the first dot screen chip 13RTD2785T output control the first output interface 15 and the second output interface 16, and the first output interface 15 and the second output interface 16 are respectively connected to two EDP display screens.

In the embodiment of the present invention, the USB-8268 module may adopt the HS8268 in the prior art;

Furthermore, the display driver board 10 also includes a third input interface 20 directly and electrically connected to the first dot screen chip 13; the third input interface 20 is used to access an external input HDMI signal and transmit the HDMI signal to the first dot screen chip 13 dot screen.

The display driver board 10 also includes an audio amplifier 21 and a speaker 22 electrically connected to the first dot screen chip 13 or the second dot screen chip 14; the audio amplifier 21 controls the volume of the speaker 22, wherein the model of the audio amplifier 21 can be NS4263 in the prior art.

Compared with the prior art, the dual-screen display of the present invention includes a display driver board and two EDP display screens, wherein the display driver board includes a Type C1 interface, a TYPE C2 interface, a PD protocol controller of an interface control chip LDR6282, a USB2.0 video conversion HDMI decoder HS8268, a first and a second point screen chip RTD2785T, an IM5200 power chip and an IM2603 power chip and two EDP output interfaces, and is connected to a computer/mobile phone with a full-function Type C output through the Type C1/C2 interface, and can be connected through an ordinary Type C cable, and through the (MST/SST) function of the front-end RTD2785T, a DP signal is output to the back-end RTD2785T to output a dual-screen display; Type C The DP signal of C1/C2 input is input to the first dot screen chip RTD2785T. The computer can also output an HDMI signal to the second dot screen chip RTD2785T through the USB2.0 interface, and display the dual-screen function at the same time, solving the problem that the Apple system does not support the simultaneous expansion of two screens; it also supports one HDMI input and one USB2.0 input, and displays two screens at the same time; it supports different systems and various computer interfaces. The main computer's display can be displayed on the same screen, or the display can be expanded to improve office efficiency and enrich entertainment content.

As shown in FIG. 4-6, a logic diagram of the control method of the dual-screen display screen in this embodiment is shown, wherein the specific steps of the control method are described as follows:

1. First, the LDR6282 interface control chip 17 detects that a power source or device is plugged in, and completes the system power supply or device charging function through the CC protocol. The integrated circuit bus detection informs the RTD2785T whether the first point screen chip or the second point screen chip is in charging status, as well as the forward and reverse insertion status of the TYEP_C1 or TYPE_C2 signal;

2. After the first and second dot screen chips RTD2785T are powered on, they work normally and light up the startup logos of the two displays;

3. The first dot screen chip RTD2785T controls the video logic MST output or switches the USB3.0 video output function; after the first dot screen chip RTD2785T normally recognizes that a TYPE_C device is inserted, it outputs a DP signal video signal, and at the same time outputs another DP signal to the second dot screen chip RTD2785T through the MST function;

4. The second dot screen chip RTD2785T detects the DP video signal input by the first dot screen chip RTD2785T and then displays the screen normally; the first dot screen chip RTD2875T controls the circuit switch of the video output USB2.0 video output to the second dot screen chip RTD2785T, and turns off the MST output function;

5. The second dot screen chip RTD2785T inputs the USB2.0 to HDMI input signal and lights up the connected display screen; the first dot screen chip RTD2785T detects the HDMI signal input and lights up the display screen connected to it. When the USB2.0 signal is input, the USB2.0 control circuit is turned on and the HDMI is output to the second dot screen chip RTD2785T to light up the other display screen, thus realizing two-way expansion;

6. When set to one-key large-screen mode, the first dot screen chip RTD2785T displays the upper half of the input video, and the first dot screen chip RTD2785T then outputs the video to the second dot screen chip RTD2785T through the SST function, and the second dot screen chip RTD2785T displays the lower half of the video.

7. The first point screen chip RTD2785T and the second point screen chip RTD2785T control the menu logic, through individual button control, and through serial port communication, adjust the display OSD menu adjustment function of the two screens at the same time.

Furthermore, the above scheme has the following advantages:

1. Both TYPE-C ports support full functions and are compatible with all MAC and WINDOWS computer systems, and are adapted to the respective computer interfaces TYPE-C/Thunderbolt 3/Thunderbolt 4. The dual TYPE-C ports support image output and have charging function. The interface device uses power while the device consumes battery power, which is convenient and fast.

2. The first point screen chip RTD2785T has MST function. When the device that supports MST function is input, two screens can be expanded at the same time. When the inserted device does not support MST function (such as Apple MAC system), two screens can be expanded at the same time through one DP signal and another USB signal.

3. The first and second point screen chips RTD2795T can realize one-key large screen (1920X2160@60Hz) signal input. The upper screen supports 180-degree video flipping and can display point-to-point, so that the upper and lower screens can display the same video screen, which is convenient for some users to work and operate documents. When the computer only has USB+HDMI ports, connecting two USB and HDMI signals can still expand two screens at the same time.

4. When two screens are displayed on the same line, the brightness is automatically limited; after the charger is plugged in, the brightness is automatically adjusted to facilitate use in various occasions.

5. The dual screens can simultaneously expand the display, or display the same screen at the same time; it is convenient for users to choose and use a variety of display combinations; the OSD menu can be adjusted at the same time, and the operation is simple; it is convenient for users to operate and adjust.

3. Embodiment 3:

A dual-screen display according to a preferred embodiment of the present invention, as shown in FIG7 , comprises a display driver board 10 and two display screens, wherein the display driver board 10 comprises a first input interface 11, a second input interface 12, a conversion module, a first dot screen chip 13, a second dot screen chip 14, a first output interface 15 and a second output interface 16; in one embodiment, the first input interface 11 adopts a TYPE-C1 interface, and the second input interface 12 adopts a TYPE-C2 interface; the chip model of the first dot screen chip 13 can adopt RTD2785T in the prior art, and the second dot screen chip 14 can adopt RTD2555T in the prior art; the first output interface 15 and the second output interface 16 both adopt an EDP screen interface that matches the display screen;

Furthermore, the first input interface 11 and the second input interface 12 are both used to access external input DP signals or USB2.0 signals; the first input interface 11 and the second input interface 12 are both connected to the interface control chip 17 through an integrated circuit bus, and then convert the externally connected Type C1/C2 signal into a charging CC protocol signal, wherein the model of the interface control chip 17 adopts the LDR6020P in the prior art; the conversion module converts the DP signal or USB2.0 signal output by the first input interface 11 into a first HDMI signal or a first VGA signal or a first DP signal and transmits it to the first point screen chip 13, and converts the DP signal or USB2.0 signal output by the second input interface 12 into a second HDMI signal or a second VGA signal or a second DP signal and transmits it to the second point screen chip 14; the two DP signals output by the first input interface 11 and the second input interface 12 are respectively connected to the first point screen chip 13; the second point screen chip 14 is signal-connected to the first point screen chip 13, and is used to output the DP video signal from the first point screen chip 13 to the second point screen chip 1 4; the two USB2.0 signals output by the first input interface 11 and the second input interface 12 are output as HDMI signals through the USB to video decoding output device 19; the first dot screen chip 13 and the second dot screen chip 14 respectively control the dot screen of the first output interface 15 and the second output interface 16; the first output interface 15 and the second output interface 16 are respectively electrically connected to the two display screens; the first dot screen chip 13 and the second dot screen chip 14 are respectively controlled to dot the two display screens after the signals are connected; the dual-screen display also includes a power module 18, and the first input interface 11 and the second input interface 12 are both electrically connected to the power module 18; the power module 18 converts the power connected to the first input interface 11 or the second input interface 12 into a DC power supply for the DCDC control voltage output required by the display driver board 10 and the backlight power required by the two display screens;

In one embodiment, the conversion module includes a first PD protocol controller of an LDR6020P interface control chip 17, and a USB to video decoder outputter 19 that converts and encodes the signals of the first input interface 11 and the second input interface 12 into HDMI signals or VCG signals respectively; the power module 18 includes an IM2603 power chip 181 and an IM5200 power chip 182; the IM2603 power chip 181 and the IM5200 power chip 182 are both electrically connected to the first PD protocol controller 17; the IM2603 power chip 181 is electrically connected to the first dot screen chip 13 through the first DCDC module 183; the IM5200 power chip 182 is electrically connected to the second dot screen chip 14 through the second DCDC module 184. The DCDC modules are controlled respectively through the IM5200 power chip 182 and the IM2603 power chip 181, and the output system power circuit and the backlight power circuit are output;

Optionally, the system power supply circuit is connected to the power supply connected to the first input interface 11 or the second input interface 12, and includes three DCDC step-down circuits, wherein two DCDC step-down circuits are used to convert the power supply connected to the first input interface 11 or the second input interface 12 into 3.3V, and the other two DCDC step-down circuits are used to convert the power supply connected to the first input interface 11 or the second input interface 12 into 2.8V and 1.8V;

The backlight power supply circuit includes two 12V boost circuits, which are connected to the power supply of the first input interface 11 or the power supply of the second input interface 12. The two boost circuits are used to convert the power supply of the first input interface 11 or the power supply of the second input interface 12 into a 12V power supply, and provide it to the two EDP display screens respectively, wherein the boost circuit is implemented using the boost chip IM5200.

The USB to video decoding output device 19 includes a USB-SW module 191, a USB-HUB module 192 and a USB-8268 module 193 connected in sequence; the first input interface 11 and the second input interface 12 are both electrically connected to the USB-SW module 191, and the output end of the USB-8268 module 193 converts and outputs HDMI signals;

Furthermore, the DP signal of the first input interface 11 or the second input interface 12 is connected to the first dot screen chip 13RTD2785T, and the second dot screen chip 14RTD2555T is connected to the DP signal output port of the first dot screen chip 13RTD2785T, and then the first dot screen chip 13RTD2785T outputs the DP video signal to the second dot screen chip 14RTD2555T; the USB2.0 signal of the first input interface 11 or the second input interface 12 switches the USB2.0 signal to the USB-8268 module 193 through the USB-SW module 191, and outputs the HDMI signal to the second dot screen chip 14RTD2555T; the second dot screen chip 14RTD2555T and the first dot screen chip 13RTD2785T output control the first output interface 15 and the second output interface 16, and the first output interface 15 and the second output interface 16 are respectively connected to two EDP display screens.

In the embodiment of the present invention, the USB-8268 module may adopt the HS8268 in the prior art;

Furthermore, the display driver board 10 also includes a third input interface 20 directly and electrically connected to the first dot screen chip 13; the third input interface 20 is used to access an external input HDMI signal and transmit the HDMI signal to the first dot screen chip 13 dot screen.

The display driver board 10 also includes an audio amplifier 21 and a speaker 22 electrically connected to the first dot screen chip 13 or the second dot screen chip 14; the audio amplifier 21 controls the volume of the speaker 22, wherein the model of the audio amplifier 24 can be NS4263 in the prior art.

Compared with the prior art, the dual-screen display of the present invention includes a display driver board and two EDP display screens, wherein the display driver board includes a Type C1 interface, a TYPE C2 interface, a PD protocol controller of an interface control chip LDR6020, a USB2.0 video conversion HDMI decoder HS8268, a first point screen chip RTD2785T and a second point screen chip RTD2555T, an IM5200 power chip and an IM2603 power chip and two EDP output interfaces, and is connected to a computer/mobile phone with a full-function Type C output through the Type C1/C2 interface, and can be connected through an ordinary Type C cable, and through the (MST/SST) function of the first point screen chip RTD2785T, a DP signal is output to the second point screen chip RTD2555T, and a dual-screen display is output; Type C1/C2 interface, a DP signal is output to the second point screen chip RTD2555T, and a dual-screen display is output; The DP signal of C1/C2 input is input to the first dot screen chip RTD2785T. The computer can also output an HDMI signal to the second dot screen chip RTD2785T through the USB2.0 interface, and display the dual-screen function at the same time, solving the problem that the Apple system does not support the simultaneous expansion of two screens; it also supports one HDMI input and one USB2.0 input, and displays two screens at the same time; it supports different systems and various computer interfaces. The main computer's display can be displayed on the same screen, or the display can be expanded to improve office efficiency and enrich entertainment content.

As shown in FIGS. 8-10 , a logic diagram of the control method of the dual-screen display screen in this embodiment is shown, wherein the specific steps of the control method are described as follows:

1. First, the LDR6020 interface control chip 17 detects that a power source or device is plugged in, and completes the system power supply or device charging function through the CC protocol. The integrated circuit bus detection informs the RTD2785T first point screen chip and the RTD2555T second point screen chip whether they are in charging status, as well as the forward and reverse insertion status of the TYEP_C1 or TYPE_C2 signal;

2. The first dot screen chip RTD2785T and the second dot screen chip RTD2555T work normally after being powered on to light up the startup logos of the two displays;

3. The first dot screen chip RTD2785T controls the video logic MST output or switches the USB3.0 video output function; after the first dot screen chip RTD2785T normally recognizes that a TYPE_C device is inserted, it outputs a DP signal video signal, and at the same time outputs another DP signal to the second dot screen chip RTD2555T through the MST function;

4. The second dot screen chip RTD2785T detects the DP video signal input by the first dot screen chip RTD2785T and then displays the screen normally; the first dot screen chip RTD2875T controls the circuit switch of the video output USB2.0 video output to the second dot screen chip RTD2555T, and turns off the MST output function;

5. The second dot screen chip RTD2555T inputs the USB2.0 to HDMI input signal and lights up the connected display screen; the first dot screen chip RTD2785T detects the HDMI signal input and lights up the display screen connected to it. When the USB2.0 signal is input, the USB2.0 control circuit is turned on and the HDMI is output to the second dot screen chip RTD2555T to light up the other display screen, thus realizing two-way expansion;

6. When set to one-key large-screen mode, the upper half of the input video is displayed on the first dot screen chip RTD2785T, and the first dot screen chip RTD2785T then outputs the video to the second dot screen chip RTD2555T through the SST function, and the second dot screen chip RTD2555T displays the lower half of the video.

7. The first screen chip RTD2785T and the second screen chip RTD2555T control the menu logic, which are controlled by individual buttons and communicate through the serial port to adjust the display OSD menu adjustment function of the two screens at the same time.

Furthermore, the above scheme has the following advantages:

1. Both TYPE-C ports support full functions and are compatible with all MAC and WINDOWS computer systems, and are adapted to the respective computer interfaces TYPE-C/Thunderbolt 3/Thunderbolt 4. The dual TYPE-C ports support image output and have charging function. The interface device uses power while the device consumes battery power, which is convenient and fast.

2. The first point screen chip RTD2785T has MST function. When the device that supports MST function is input, two screens can be expanded at the same time. When the inserted device does not support MST function (such as Apple MAC system), two screens can be expanded at the same time through one DP signal and another USB signal.

3. The first point screen chip RTD2785T can pass the SST function, one-click large screen (1920X2160@60Hz) signal input, to achieve the upper and lower screens to display the same video screen, convenient for some users to work and document operation. When the computer only has USB+HDMI port, two USB and HDMI signals can be connected to expand two screens at the same time.

4. When two screens are displayed on the same line, the brightness is automatically limited; after the charger is plugged in, the brightness is automatically adjusted to facilitate use in various occasions.

5. The dual screens can simultaneously expand the display, or display the same screen at the same time; it is convenient for users to choose and use a variety of display combinations; the OSD menu can be adjusted at the same time, and the operation is simple; it is convenient for users to operate and adjust.

4. Embodiment 4:

A dual-screen display according to a preferred embodiment of the present invention, as shown in FIG11 , comprises a display driver board 10 and two display screens, wherein the display driver board 10 comprises a first input interface 11, a second input interface 12, a conversion module, a first dot screen chip 13, a second dot screen chip 14, a first output interface 15 and a second output interface 16; in one embodiment, the first input interface 11 adopts a TYPE-C1 interface, and the second input interface 12 adopts a TYPE-C2 interface; the chip models of the first dot screen chip 13 and the second dot screen chip 14 can adopt RTD2556VD in the prior art; the first output interface 15 and the second output interface 16 both adopt an EDP screen interface that matches the display screen;

Furthermore, the first input interface 11 and the second input interface 12 are both used to access external input DP signals or USB2.0 signals; the first input interface 11 or the second input interface 12 is powered by a separate PD; the first input interface 11 and the second input interface 12 Type C1/C2 interface are used to access external Type The DP signal or HDMI signal input by C1/C2; the conversion module converts the DP signal or USB2.0 signal output by the first input interface 11 into a first HDMI signal or a first VGA signal or a first DP signal and transmits it to the first dot screen chip 13, and converts the DP signal or USB2.0 signal output by the second input interface 12 into a second HDMI signal or a second VGA signal or a second DP signal and transmits it to the second dot screen chip 14; the first output interface 15 and the second output interface 16 are electrically connected to the two display screens respectively; the first dot screen chip 13 and the second dot screen chip 14 are connected by signal and control the dot screens of the two display screens respectively; the dual-screen display also includes a power module (not shown in the figure), and the first input interface 11 and the second input interface 12 are both electrically connected to the power module (not shown in the figure); the power module (not shown in the figure) converts the power connected to the first input interface 11 or the second input interface 12 into a DC power supply for the DCDC control voltage output required by the display driver board 10 and the backlight power required by the two display screens;

The display driver board 10 also includes a PD power input interface 23 and a battery interface 24; the PD power input interface 23 and the battery interface 24 are electrically connected to the second dot screen chip 14 through the interface control chip 17 respectively; the conversion module includes two second PD protocol controllers respectively arranged in the interface control chip 17 and two switching chips 25; the model of the switching chip can be ASW3642 in the prior art, and the model of the interface control chip 17 can be CH543D in the prior art; the two interface control chips 17 transmit both external power signals to the second dot screen chip 14; the two switching chips 25 are electrically connected to the first input interface 11 and the second input interface 12 respectively, and one switching chip 25 switches the DP signal or HDMI signal of the first input interface 11 to the first dot screen chip 13, and the other switching chip 25 switches the DP signal or HDMI signal of the second input interface 12 to the second dot screen chip 14.

The CH543D interface control chip 17 is connected to the PD power input interface 23 and the battery interface 24 through the CC bus of TYPE C1/C2, and controls the input power voltage and the output charging voltage circuit gear control by controlling the CC protocol; the two DCDC modules are controlled by the two interface control chips 17 to output the system power circuit and the backlight power circuit respectively;

The system power supply circuit is connected to the power supply of the first or second input interface Type C1/C2 interface, and includes three DCDC step-down circuits, wherein two DCDC step-down circuits are used to convert the power supply of the Type C1/C2 interface to 3.3V, and the other two DCDC step-down circuits are used to convert the power supply of the first or second input interface Type C1/C2 interface to 2.8V and 1.8V;

The backlight power supply circuit includes two 12V boost circuits, which are connected to the power supply of the first input interface Type C1 interface or the power supply of the second input interface TYPE C2 interface. The two boost circuits are used to convert the power supply of the first input interface Type C1 interface or the power supply of the second input interface TYPE C2 interface into 12V power supply, and provide it to the two EDP display screens respectively; the boost circuit is implemented by the boost chip LA1315E.

The display driver board 10 also includes an audio amplifier 21 and a speaker 22 electrically connected to the first dot screen chip 13 or the second dot screen chip 14; the audio amplifier 21 controls the volume of the speaker 22, wherein the model of the audio amplifier 24 can be CS8580E in the prior art.

Compared with the prior art, the dual-screen display of the present invention includes a display driver board and two EDP display screens, wherein the display driver board includes a Type C1 interface, a TYPE C2 interface, two CH543D PD protocol controllers, a first and a second dot screen chip RTD2556VD, a LA1315E and two STI3508 power modules and a first and a second output EDP interface, and is connected to a computer/mobile phone with a full-function Type C output through the Type C1/C2 interface, and can be connected through an ordinary Type C cable, and an HDMI custom cable is added to output a signal to the back-end RTD2556VD to output a dual-screen display; the dual-screen function is displayed at the same time, and the display screens of the main computers of various computer interfaces are displayed on the same screen, or the display is extended, thereby improving office efficiency and enriching entertainment content;

As shown in FIGS. 12-13 , a logic diagram of a control method of a dual-screen display screen in this embodiment is shown, wherein the specific steps of the control method are described as follows:

1. First, the CH543D interface control chip 17 detects whether there is a power supply or device inserted, and the integrated circuit bus detection informs RTD2556VD of the charging status of the first point screen chip 13 or the second point screen chip 14, as well as the forward and reverse insertion status of the first input interface 11TYPE-C1 interface and the second input interface 12TYPE-C2 interface;

2. The first and second dot screen chips RTD256VD work normally after being powered, and light up two EDP display screens to display the power-on LOGO;

3. The first input interface TYPE-C1 video input detects whether the current insertion is DP or HDMI through the switching chip ASW3642, realizes two signal recognition functions, and sends one DP or HDMI signal to the first point screen chip RTD2556VD;

4. The second input interface TYPE-C2 video input detects whether the current insertion is DP or HDMI through the switching chip ASW3642, realizes two signal recognition functions, and sends one DP or HDMI signal to the second point screen chip RTD2556VD;

5. After the battery is inserted into the battery socket and the PD voltage is also inserted, the whole machine can also charge the battery; one DP signal and the other HDMI input can expand the display of two screens at the same time; 7. The first and second point screen chips RTD2556VD control the menu logic, and through individual button control and serial port communication, the OSD menu adjustment function of adjusting the display of two screens at the same time is realized.

Furthermore, the above scheme has the following advantages:

1. Both TYPE-C ports support full functions and are compatible with all MAC and WINDOWS computer systems, and are adapted to the respective computer interfaces TYPE-C/Thunderbolt 3/Thunderbolt 4. The dual TYPE-C ports support image output and have charging function, and the interface device consumes power from the device battery.

2. After the PD power supply is inserted, the first and second input interfaces support image output and have a charging function, which solves the problem of extended screen power consumption and battery power consumption of computer equipment, which is convenient and fast.

3. Dual DP input or DP+HDMI input, two TYPE-C ports can be inserted at will to expand two screens at the same time.

4. When an external battery is inserted, the system can follow up whether there is PD power and select the system's power supply system. When there is PD, the external battery and device can be charged. If the PD power is not connected, the battery can power the entire extended screen, increase the outdoor application of the system, and reduce dependence on the computer equipment system battery.

5. When two screens are displayed with one line, the brightness is automatically limited; after the charger is inserted, the brightness is automatically adjusted to facilitate use in respective occasions; the dual screens can be expanded at the same time, or one screen can be displayed at the same time; it is convenient for users to choose and use a variety of display combinations; the OSD menu can be adjusted at the same time, and the operation is simple; it is convenient for users to operate and adjust.

It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims (10)

1. A dual-screen display, comprising a display driver board and two display screens, characterized in that the display driver board comprises a first input interface, a second input interface, a conversion module, a first point screen chip, a second point screen chip, a first output interface and a second output interface; the first input interface and the second input interface are both used to access external input DP signals or USB2.0 signals; the first input interface and/or the second input interface are connected to an interface control chip via an integrated circuit bus; the conversion module converts the DP signal or the USB2.0 signal output by the first input interface into a first HDMI signal or a first VGA signal or a first DP signal and transmits it to the first dot-screen chip, and convert the DP signal or the USB2.0 signal output by the second input interface into a second HDMI signal or a second VGA signal or a second DP signal and transmit it to the second dot-screen chip; the first output interface and the second output interface are electrically connected to the two display screens respectively; the first dot-screen chip and the second dot-screen chip are connected by signal and control the dots of the two display screens respectively; the dual-screen display also includes a power module, which converts the power connected to the first input interface or the second input interface into a DC power supply for the DCDC control voltage output required by the display driver board and the backlight power required by the two display screens. 2. The dual-screen display according to claim 1 is characterized in that the conversion module includes a first PD protocol controller of the interface control chip and a USB to video decoding outputter that converts and encodes the signals of the first input interface and the second input interface into HDMI signals or VCG signals respectively; the first PD protocol controller converts the signals connected to the first input interface and the second input interface into charging CC protocol signals, controls the input power supply, and outputs the charging voltage circuit gear. 3. The dual-screen display according to claim 2 is characterized in that the two output interfaces of the USB to video decoding output device are electrically connected to the first dot screen chip and the second dot screen chip respectively, and the converted HDMI signal and the VCG signal are respectively distributed to the first dot screen chip and the second dot screen chip. 4. The dual-screen display according to claim 2 is characterized in that the two DP signals output by the first input interface and the second input interface are respectively connected to the first dot screen chip; the second dot screen chip is signal-connected to the first dot screen chip for outputting DP video signals from the first dot screen chip to the second dot screen chip; the two USB2.0 signals output by the first input interface and the second input interface are output as HDMI signals through a USB to video decoder outputter; the first dot screen chip and the second dot screen chip respectively control the dot screens of the first output interface and the second output interface. 5. The dual-screen display according to claim 4 is characterized in that the power module includes an IM2603 power chip and an IM5200 power chip; the IM2603 power chip and the IM5200 power chip are both electrically connected to the first PD protocol controller; the IM2603 power chip is electrically connected to the first dot screen chip through a first DCDC module; the IM5200 power chip is electrically connected to the second dot screen chip through a second DCDC module. 6. The dual-screen display according to claim 4 or 5 is characterized in that the USB to video decoding output device includes a USB-SW module, a USB-HUB module and a USB-8268 module connected in sequence; the first input interface and the second input interface are both electrically connected to the USB-SW module, and the output end of the USB-8268 module converts and outputs the HDMI signal to the second dot screen chip dot screen signal. 7. The dual-screen display according to claim 4 or 5 is characterized in that the display driver board also includes a third input interface directly electrically connected to the first dot screen chip; the third input interface is used to access an external input HDMI signal and transmit the HDMI signal to the first dot screen chip. 8. The dual-screen display according to claim 1 is characterized in that the display driver board also includes a PD power input interface and a battery interface; the conversion module includes two second PD protocol controllers and two switching chips respectively arranged in the first point screen chip and the second point screen chip; the two second PD protocol controllers are electrically connected to the PD power input interface and the battery interface, respectively, and transmit the external power signal to the first point screen chip; the two switching chips are electrically connected to the first input interface and the second input interface, respectively, one of the switching chips switches the DP signal or HDMI signal of the first input interface to the first point screen chip, and the other switching chip switches the DP signal or HDMI signal of the second input interface to the second point screen chip. 9. The dual-screen display according to any one of claims 1-5 and 8 is characterized in that the display driver board also includes an audio amplifier and a speaker electrically connected to the first dot screen chip or the second dot screen chip; the audio amplifier controls the volume of the speaker. 10. A control method for a dual-screen display screen, using the dual-screen display as claimed in any one of claims 1 to 9, characterized in that the control method comprises the following steps: The interface control chip detects whether there is a power supply or device plugged into the display driver board. If so, the system is powered or the device is charged through the CC protocol. The integrated circuit bus detects the charging status of the first dot screen chip or the second dot screen chip, as well as the forward and reverse insertion status of the first input interface and the second input interface. After the first dot screen chip and the second dot screen chip are powered on, they work normally and light up the startup logos of the two display screens; The conversion module converts the DP signal or USB2.0 signal output by the first input interface into a first HDMI signal or a first VGA signal or a first DP signal and transmits it to the first dot screen chip, and converts the DP signal or USB2.0 signal output by the second input interface into a second HDMI signal or a second VGA signal or a second DP signal and transmits it to the second dot screen chip; After the first dot screen chip detects the first HDMI signal, the first VGA signal or the first DP signal, it controls the display screen connected thereto to start displaying; After the second dot screen signal detects the second HDMI signal, the second VGA signal or the second DP signal, the second dot screen signal controls the display screen connected thereto to start displaying.