Display touch screen circuit, equipment mainboard and vehicle-mounted equipment

Abstract

The utility model discloses a display touch screen circuit, a device mainboard and a vehicle-mounted device, the circuit comprises a master control CPU processor, a display socket and a touch screen socket, the display socket is electrically connected with a display processing unit in the master control CPU processor, and the touch screen socket is electrically connected with the display processing unit in the master control CPU processor. The touch screen socket is connected with one of at least two protocol interfaces in the master control CPU processor through a resistance connector, and the resistance connector supports touch screen signals of at least two protocols including a USB interface and an I2C interface at the same time. The hardware circuit board in the embodiment of the utility model can be adapted to touch screens with two different protocols. On one hand, the transmission mode is simplified, and on the other hand, hardware development and maintenance cost is reduced.

Description

Technical Field

[0001] This application relates to the field of software and hardware circuit design of in-vehicle display touch screens, and particularly to a display touch screen circuit, a device main board, and an in-vehicle device. Background Art

[0002] Video output display is a basic function of in-vehicle devices. The display screen can display local in-vehicle videos or cloud videos on the driver and passenger display screens. At the same time, for drivers or passengers, there is a need for touch control, and the touch signal is transmitted to the touch unit of the main control for processing. As Figure 1 shown, it is a schematic diagram of the design of an in-vehicle device main board. The display signal is output to the display socket, transmitted through a cable to the display screen for presentation. The touch screen outputs a USB signal, which is transmitted through a cable to the touch socket of the main board and then to the main control USB touch processing unit for processing.

[0003] Figure 2 shown, it is a schematic diagram of the design of an in-vehicle device main board when the touch transmission uses the I2C protocol. The touch screen outputs an I2C signal, which is transmitted through a cable to the touch socket of the main board and then to the main control I2C touch processing unit for processing.

[0004] However, in-vehicle devices have touch screens with multiple protocols, such as USB / I2C protocol touch screens. The touch screen signal is connected to the main control end through a flexible cable or a cable. In this way, it is necessary to design multiple main boards to match different touch screens. Different protocol touch screens require different transmission methods and cables, and the main control end hardware cannot be compatible, resulting in hardware adaptation problems. Summary of the Utility Model

[0005] Embodiments of this application provide a display touch screen circuit, a device main board, and an in-vehicle device, so that the hardware circuit board can adapt to two different protocol touch screens. It simplifies the transmission method and reduces the hardware development and maintenance costs at the same time.

[0006] Embodiments of this application adopt the following technical solutions:

[0007] In a first aspect, embodiments of this application provide a display touch screen circuit. The circuit includes: a main control CPU processor, a display socket, and a touch screen socket. The display socket is electrically connected to the display processing unit in the main control CPU processor. The touch screen socket is respectively connected to one of at least two protocol interfaces in the main control CPU processor through a resistor connector. The resistor connector supports touch screen signals of at least two protocols including a USB interface and an I2C interface at the same time.

[0008] In some embodiments, the resistive connector includes: a first resistor and a second resistor. The inputs of the first resistor and the second resistor are connected together, and the outputs are respectively connected to two touch USB interfaces and a touch I2C interface in the main control CPU processor, and only one interface is connected.

[0009] In some embodiments, the touch screen socket includes a 3Pin socket. The resistive connector is connected to the 3Pin socket, and two signals are switched by hardware resistor selective soldering.

[0010] In some embodiments, the input ends of the first resistor and the second resistor use the same pad.

[0011] When using a USB protocol touch screen, it is soldered to the first resistor.

[0012] When using an I2C protocol touch screen, it is soldered to the second resistor.

[0013] In some embodiments, when soldered to the first resistor, the first resistor is connected to the touch USB interface through USB_DP signal line and USB_DM signal line.

[0014] When soldered to the second resistor, the second resistor is connected to the touch I2C interface through I2C_SCL signal line and I2C_SDA signal line.

[0015] In some embodiments, the touch screen socket uses two-channel data signals Touch_Data and one-channel reference ground signal GND.

[0016] In some embodiments, the main control CPU processor includes at least a touch USB interface and a touch I2C interface, and the main control CPU processor supports touch screen interface signals of the touch USB interface protocol and the touch I2C interface protocol.

[0017] In some embodiments, it further includes a touch screen, and the touch screen is electrically connected to the display socket.

[0018] In a second aspect, an embodiment of the present application further provides a device motherboard, which includes the display touch screen circuit as described in the first aspect.

[0019] In a third aspect, an embodiment of the present application further provides a vehicle-mounted device, which includes the display touch screen circuit as described in the first aspect.

[0020] The above at least one technical solution adopted in the embodiments of the present application can achieve the following beneficial effects: The display touch screen circuit includes a main control CPU processor, a display socket, and a touch screen socket. The display socket is electrically connected to the display processing unit in the main control CPU processor. The touch screen socket is connected to the touch USB interface and the touch I2C interface in the main control CPU processor through a resistance connector respectively. The resistance connector supports touch screen signals of two protocols of the USB interface and the I2C interface at the same time. By integrating touch screen circuits of two different protocols, namely USB and I2C, on a hardware circuit board, a hardware circuit board can be adapted to touch screens of two different protocols directly through resistance selective soldering. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The schematic embodiments and descriptions thereof of the present application are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0022] Figure 1 is a schematic diagram of the in-vehicle main board design in the related art;

[0023] Figure 2 is a schematic diagram of the connection relationship when the touch transmission adopts the I2C protocol in the related art;

[0024] Figure 3 is a schematic diagram of the internal structure of the display touch screen circuit in the embodiments of the present application;

[0025] Figure 4 is a circuit schematic diagram of the display touch screen circuit in the embodiments of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below in conjunction with the specific embodiments of the present application and the corresponding drawings. Apparently, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0027] The technical solutions provided in each embodiment of the present application will be described in detail below in conjunction with the drawings.

[0028] The embodiments of the present application provide a display touch screen circuit, as Figure 3As shown, a schematic diagram of the internal structure of the touch screen circuit in the embodiment of the present application is provided. The circuit includes: a main control CPU processor, a display socket 310, and a touch screen socket 320. The display socket 310 is electrically connected to a display processing unit 330 in the main control CPU processor. The touch screen socket 320 is connected to one of at least two protocol interfaces in the main control CPU processor through a resistor connector 360. The resistor connector 360 supports touch screen signals of at least two protocols including a USB interface and an I2C interface at the same time.

[0029] The data output of the main control CPU processor is directly connected to the display socket 310 of the single board. The main control CPU processor supports both USB protocol touch screen interface and I2C protocol touch screen interface signals at the same time. Optionally, the resistor connector 360 switches a 3Pin socket signal that is compatible with both USB and I2C protocols on the main board into two signals through hardware resistor selective soldering and sends them to the touch USB interface 340 and the touch I2C interface 350 of the main control CPU processor respectively.

[0030] The above circuit directly achieves the purpose that a hardware circuit board can adapt to two different protocol touch screens through resistor selective soldering, simplifies the transmission method, and reduces the hardware development and maintenance costs at the same time.

[0031] For the above circuit, the production workers on the production line can directly complete the connection adjustment without re-developing the software and hardware.

[0032] In an embodiment of the present application, the resistor connector 360 includes: a first resistor and a second resistor. The inputs of the first resistor and the second resistor are connected together, and the outputs are respectively connected to two touch USB interfaces and a touch I2C interface in the main control CPU processor, and only one interface is connected.

[0033] The resistor plays a role in signal coupling and switching. A signal line is divided into two outputs through two resistors (the first resistor and the second resistor). The inputs of the first resistor and the second resistor are connected together, and the outputs are respectively connected to two signal controllers of the main control. In this way, there are 2 groups of signals and a total of 4 such resistors are required as switching resistors, that is, both the first resistor and the second resistor include two resistors.

[0034] In an embodiment of the present application, the touch screen socket 320 includes a 3Pin socket. The resistor connector is connected to the 3Pin socket and is switched into two signals through hardware resistor selective soldering.

[0035] The touch screen and the main board are connected through the touch screen socket 320. The touch screen socket 320 uses a 3Pin connector with 2-way data signals Touch_Data and 1-way reference ground signal GND. The resistive connector 360 in the embodiment of the present application can support touch screen signals of both protocols simultaneously.

[0036] In an embodiment of the present application, the input ends of the first resistor and the second resistor share the same pad. When using a USB protocol touch screen, it is welded to the first resistor; when using an I2C protocol touch screen, it is welded to the second resistor.

[0037] During specific implementation, a common pad design is adopted in hardware, that is, the input ends of the two resistors share the same pad, and the outputs are respectively connected to the USB and I2C controller ports of the main control. This can minimize the high-speed signal integrity problems caused by branched traces to the greatest extent. When using a USB protocol touch screen, the R1 resistor (the first resistor) is welded; when using an I2C protocol touch screen, the R2 resistor (the second resistor) is welded. The input ends of R1 and R2 share a pad in the PCB design.

[0038] In an embodiment of the present application, when welded to the first resistor, the first resistor is connected to the touch USB interface through the USB_DP signal line and the USB_DM signal line; when welded to the second resistor, the second resistor is connected to the touch I2C interface through the I2C_SCL signal line and the I2C_SDA signal line.

[0039] As Figure 4 shown, when welded to the first resistor, the first resistor is connected to the touch USB interface through the USB_DP signal line and the USB_DM signal line. The USB_DP signal line and the USB_DM signal line are two signal lines in the USB data cable for transmitting data. Pull-up and pull-down refer to the operation of pulling up or pulling down the voltage of these two signal lines. USBDM and DP respectively represent the data differential transmission and data differential reception lines.

[0040] When welded to the second resistor, the second resistor is connected to the touch I2C interface through the I2C_SCL signal line and the I2C_SDA signal line. The I2C_SCL signal line is used to generate synchronous clock pulses. The I2C_SDA signal line is responsible for transmitting serial data between devices.

[0041] In an embodiment of the present application, the touch screen socket 320 uses 2-way data signals Touch_Data and 1-way reference ground signal GND.

[0042] After passing through the resistive connector 360, the touch screen socket 320 supports touch screen signals of both protocols simultaneously.

[0043] In one embodiment of the present application, the main control CPU processor includes at least a touch USB interface and a touch I2C interface, and the main control CPU processor supports touch screen interface signals of the touch USB interface protocol and the touch I2C interface protocol.

[0044] The main control CPU processor needs to support touch screen interface signals of the touch USB interface protocol and the touch I2C interface protocol.

[0045] In one embodiment of the present application, a touch screen is further included, and the touch screen is electrically connected to the display socket 310.

[0046] The data of the display processing unit in the main control CPU processing is directly output and connected to the display socket of the single board, and then connected to the display screen through a cable.

[0047] An embodiment of the present application further provides a device main board, which includes the display touch screen circuit. The display touch screen circuit includes: a main control CPU processor, a display socket, and a touch screen socket. The display socket is electrically connected to the display processing unit in the main control CPU processor. The touch screen socket is respectively connected to the touch USB interface and the touch I2C interface in the main control CPU processor through a resistor connector. The resistor connector supports touch screen signals of both the USB interface and the I2C interface protocols.

[0048] Through the device main board, the purpose that a hardware circuit board can adapt to two different protocol touch screens can be directly achieved by resistor selective soldering.

[0049] An embodiment of the present application further provides a vehicle-mounted device, which includes the display touch screen circuit. The display touch screen circuit includes: a main control CPU processor, a display socket, and a touch screen socket. The display socket is electrically connected to the display processing unit in the main control CPU processor. The touch screen socket is respectively connected to the touch USB interface and the touch I2C interface in the main control CPU processor through a resistor connector. The resistor connector supports touch screen signals of both the USB interface and the I2C interface protocols.

[0050] Through the vehicle-mounted device, the production line workers can directly complete the communication adjustment, without the need for re-development of software and hardware. A hardware circuit board can be adapted to both the USB protocol touch screen and the I2C protocol touch screen inputs at the same time. The vehicle-mounted device has a high integration level and strong hardware compatibility, which can simplify the transmission method, reduce the system maintenance cost, and has a low hardware cost. The implementation method is simple and reliable.

[0051] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A display touch screen circuit, wherein: The circuit includes: a main control CPU processor, a display socket, and a touch screen socket. The display socket is electrically connected to the display processing unit in the main control CPU processor. The touch screen socket is connected to one of at least two protocol interfaces in the main control CPU processor through a resistor connector. The resistor connector simultaneously supports touch screen signals of at least two protocols including a USB interface and an I2C interface.

2. The circuit as claimed in claim 1, wherein: The resistor connector includes: a first resistor and a second resistor, the inputs of the first resistor and the second resistor are connected together and the outputs are respectively connected to two touch USB interfaces and a touch I2C interface in the main control CPU processor, and only one interface is connected.

3. The circuit as claimed in claim 2, wherein: The touch screen socket includes a 3-pin socket, the resistor connector is connected to the 3-pin socket, and is switched into two signals through hardware resistor welding.

4. The circuit as claimed in claim 3, wherein: The input ends of the first resistor and the second resistor use the same pad, When a USB protocol touch screen is used, it is welded to the first resistor; When the I2C protocol touch screen is used, the second resistor is welded.

5. The circuit as claimed in claim 4, wherein: When welded with the first resistor, the first resistor is connected to the touch USB interface through the USB_DP signal line and the USB_DM signal line. When welded with the second resistor, the second resistor is connected to the touch I2C interface through the I2C_SCL signal line and the I2C_SDA signal line.

6. The circuit as claimed in claim 1, wherein: The touch screen socket uses two data signals Touch_Data and one reference ground signal GND.

7. The circuit as claimed in claim 1, wherein: The main control CPU processor at least includes a touch USB interface and a touch I2C interface, and the main control CPU processor supports touch screen interface signals of the touch USB interface protocol and the touch I2C interface protocol.

8. The circuit as claimed in claim 1, wherein: A touch screen is also included, and the touch screen is electrically connected to the display socket.

9. A device motherboard, wherein: The invention comprises a display touch screen circuit as claimed in any one of claims 1 to 8.

10. A vehicle-mounted device, wherein: It comprises the display touch screen circuit as described in any one of claims 1 to 8.

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