Touch display circuit, equipment mainboard and vehicle-mounted equipment

Abstract

The utility model discloses a touch display circuit, a device mainboard and a vehicle-mounted device, the circuit comprises a master control CPU processor, a display screen socket, an I2C touch screen socket, a USB touch screen socket and a protocol conversion circuit, the display screen socket is electrically connected with a display processing unit in the master control CPU processor, and the protocol conversion circuit is electrically connected with the I2C touch screen socket. The I2C touch screen socket is connected with the touch processing unit in the main control CPU processor through the protocol conversion circuit, or the USB touch screen socket is connected with the touch processing unit in the main control CPU processor through the protocol conversion circuit. According to the invention, the hardware circuit board can adapt to the input of the USB protocol touch screen and the I2C protocol touch screen at the same time. On one hand, the main control CPU only needs to support the USB interface, and on the other hand, the resource demand of the main control interface is not additionally increased.

Description

Technical Field

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

[0002] The main board of an in-vehicle device in the related art is shown as Figure 1 in the main board design block diagram. 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] When the touch transmission uses the I2C protocol, the main board of an in-vehicle device in the related art is shown as Figure 2 in the figure. The touch screen outputs an I2C signal, which is transmitted through a cable to the touch socket of the main board. After being processed by an I2C-to-USB chip on the device main board, it reaches the main control USB touch processing unit for processing.

[0004] However, in the related art, there is still a situation where an additional main control interface needs to be added. In the case of an in-vehicle device with touch screens of multiple protocols, it is impossible to meet both the access requirements of the I2C touch screen socket and the access requirements of the USB touch screen socket. Summary of the Utility Model

[0005] Embodiments of this application provide a touch display circuit, a device main board, and an in-vehicle device. The main control CPU processor only needs to support a USB interface, without additional main control interface resource requirements. Thus, the hardware circuit board can be adapted to the input of both USB protocol touch screens and I2C protocol touch screens simultaneously.

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

[0007] In a first aspect, embodiments of this application provide a touch display circuit, where the circuit includes: a main control CPU processor, a display screen socket, an I2C touch screen socket, a USB touch screen socket, and a protocol conversion circuit. The display screen socket is electrically connected to the display processing unit in the main control CPU processor. The I2C touch screen socket is connected to the touch processing unit in the main control CPU processor through the protocol conversion circuit, or the USB touch screen socket is connected to the touch processing unit in the main control CPU processor through the protocol conversion circuit.

[0008] In some embodiments, the USB signal output of the main control CPU processor passes through the I2C protocol conversion chip of the protocol conversion circuit, is converted into the I2C protocol, and then is connected to the I2C touch screen socket.

[0009] In some embodiments, the USB signal output of the main control CPU processor branches at the pin of the I2C protocol conversion chip of the protocol conversion circuit and passes through the resistor of the protocol conversion circuit nearby, and is connected to the USB touch screen socket through the resistor.

[0010] In some embodiments, the resistor is disposed close to the I2C protocol conversion chip.

[0011] In some embodiments, when a USB interface touch screen is adopted, the resistor is soldered and the path of the I2C protocol conversion chip is not soldered;

[0012] When an I2C interface touch screen is adopted, the path of the I2C protocol conversion chip is soldered and the resistor is not soldered.

[0013] In some embodiments, the display screen socket is connected to the display screen through a cable.

[0014] In some embodiments, the I2C touch screen socket adopts a 3Pin connector, which includes 2-way data signals Touch_Data and 1-way reference ground signal GND;

[0015] The USB touch screen socket adopts a 3Pin connector, which includes 2-way data signals Touch_Data and 1-way reference ground signal GND.

[0016] In some embodiments, the main control CPU processor processes touch signals using a USB protocol interface.

[0017] In a second aspect, an embodiment of the present application further provides a device motherboard, which includes the touch display circuit described in the first aspect.

[0018] In a third aspect, an embodiment of the present application further provides a vehicle-mounted device, which includes the device motherboard described in the second aspect.

[0019] At least one of the above technical solutions adopted in the embodiments of the present application can achieve the following beneficial effects: The touch display circuit includes a main control CPU processor, a display screen socket, an I2C touch screen socket, a USB touch screen socket, and a protocol conversion circuit. The display screen socket is electrically connected to the display processing unit in the main control CPU processor, and the I2C touch screen socket is connected to the touch processing unit in the main control CPU processor through the protocol conversion circuit. This meets the access requirements of the I2C touch screen socket. Alternatively, the USB touch screen socket is connected to the touch processing unit in the main control CPU processor through the protocol conversion circuit. This meets the access requirements of the USB touch screen socket. Description of the Drawings

[0020] The accompanying 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 of the present application. In the drawings:

[0021] Figure 1 It is a schematic diagram of video output display;

[0022] Figure 2 It is a schematic diagram of video output display when the touch transmission adopts the I2C protocol;

[0023] Figure 3 It is a schematic diagram of the internal structure of the touch display circuit in the embodiment of the present application;

[0024] Figure 4 It is a schematic diagram of the principle of the touch display circuit in the embodiment of the present application. Detailed implementation manners

[0025] 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. Obviously, 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 making creative efforts belong to the scope of protection of the present application.

[0026] The following will, in conjunction with the drawings, detail the technical solutions provided by each embodiment of the present application.

[0027] The embodiment of the present application provides a touch display circuit, as Figure 3 shown, provides an internal schematic diagram of the touch display circuit in the embodiment of the present application. The circuit includes: a main control CPU processor, a display screen socket 310, an I2C touch screen socket 330, a USB touch screen socket 320, and a protocol conversion circuit. The display screen socket 310 is electrically connected to the display processing unit 340 in the main control CPU processor. The I2C touch screen socket 330 is connected to the touch processing unit 350 in the main control CPU processor through the protocol conversion circuit 360. Alternatively, the USB touch screen socket is connected to the touch processing unit 350 in the main control CPU processor through the protocol conversion circuit 360.

[0028] The protocol conversion circuit 360 includes a USB-to-I2C protocol conversion chip. For the I2C touch screen channel, the USB output of the main control CPU processor is converted into the I2C protocol by the protocol conversion chip and then connected to the I2C touch screen socket 330.

[0029] For the USB touch screen channel, due to the high-speed characteristics of the USB signal and considering signal integrity, the USB differential touch signal cannot be directly connected from the main control USB controller to the USB touch socket. In this case, the long forked trace will affect the signal quality. The USB signal of the main control CPU processor needs to be branched from the pin of the protocol conversion chip and walked nearby to the resistor, and then reach the USB touch screen socket 320 through the resistor.

[0030] Through the above touch display circuit, the main control CPU processor only needs to support the USB interface, without additional requirements for the main control interface resources. The touch screen circuits of two different protocols, USB and I2C, can be integrated on a single hardware circuit board. By constraining the PCB traces and components during hardware design, the purpose of enabling a single hardware circuit board to adapt to touch screens of two different protocols can be achieved.

[0031] In an embodiment of the present application, the USB signal output of the main control CPU processor passes through the I2C protocol conversion chip of the protocol conversion circuit, is converted into the I2C protocol, and then is connected to the I2C touch screen socket.

[0032] As Figure 4 shown, the USB signal output of the main control CPU processor passes through the I2C protocol conversion chip of the protocol conversion circuit, and after conversion, is connected to the I2C touch screen socket based on the I2C protocol.

[0033] In an embodiment of the present application, the USB signal output of the main control CPU processor is branched at the pin of the I2C protocol conversion chip of the protocol conversion circuit and passes through the resistor of the protocol conversion circuit nearby, and is connected to the USB touch screen socket through the resistor.

[0034] As Figure 4 shown, the USB signal output of the main control CPU processor is branched at the pin of the I2C protocol conversion chip of the protocol conversion circuit and passes through the resistor (two resistors) of the protocol conversion circuit nearby, and is connected to the USB touch screen socket through the resistor.

[0035] In an embodiment of the present application, the resistor is arranged close to the I2C protocol conversion chip.

[0036] The USB signal bifurcation should be as close as possible to the pad of the protocol conversion chip. Preferably, Figure 4As shown in [figure], it first passes through the pads of the protocol conversion chip and then extends to the resistor. At the same time, the resistor at the USB touch screen channel should also be as close as possible to the protocol conversion chip, aiming to minimize the redundant USB signal traces at the USB channel when using an I2C touch screen and reduce the interference brought by the tail wire to the high-speed USB signal. Of course, those skilled in the art can also adopt other methods, which are not specifically limited in the embodiments of this application.

[0037] In an embodiment of this application, when using a USB interface touch screen, the path of the resistor is welded and the path of the I2C protocol conversion chip is not welded; when using an I2C interface touch screen, the path of the I2C protocol conversion chip is welded and the resistor is not welded.

[0038] When the application scenario uses a USB interface touch screen, as Figure 4 shown, it is not necessary to weld the protocol conversion chip during factory production. When it is necessary to use an I2C touch screen, it is not necessary to weld the two resistors of the USB channel during factory production. Thus, it can adapt to the input of both USB protocol touch screens and I2C protocol touch screens at the same time.

[0039] In an embodiment of this application, the display socket is connected to the display through a cable.

[0040] During specific implementation, the data of the main control display processing unit is directly output and connected to the display socket of the single board, and then connected to the display through a cable.

[0041] In an embodiment of this application, the I2C touch screen socket uses a 3Pin connector, which includes 2-way data signals Touch_Data and 1-way reference ground signal GND; the USB touch screen socket uses a 3Pin connector, which includes 2-way data signals Touch_Data and 1-way reference ground signal GND.

[0042] The touch screen is connected to the main board through a touch screen socket. The touch screen socket is a 3Pin connector, with 2-way data signals Touch_Data and 1-way reference ground signal GND. The protocol conversion circuit can support the touch screen signals of these two protocols at the same time.

[0043] In an embodiment of this application, the main control CPU processor uses a USB protocol interface to process touch signals.

[0044] In order not to additionally increase the resource requirements of the main control interface, during specific implementation, the main control CPU processor uses a USB protocol interface to process touch signals. The main control CPU processor only needs to support the USB interface, without additionally increasing the resource requirements of the main control interface, which enables a hardware circuit board to simultaneously adapt to USB protocol touchscreens and I2C protocol touchscreen inputs. In this way, the integration degree is high, the hardware compatibility is strong, which can further simplify the transmission method and reduce the system maintenance cost; the hardware cost is low, and the implementation method is simple and reliable.

[0045] In an embodiment of the present application, a device main board is further provided, which includes the touch display circuit described above. The circuit includes: a main control CPU processor, a display screen socket, an I2C touchscreen socket, a USB touchscreen socket, and a protocol conversion circuit. The display screen socket is electrically connected to the display processing unit in the main control CPU processor, and the I2C touchscreen socket is connected to the touch processing unit in the main control CPU processor through the protocol conversion circuit, or the USB touchscreen socket is connected to the touch processing unit in the main control CPU processor through the protocol conversion circuit.

[0046] In some embodiments, the USB signal output of the main control CPU processor of the device main board passes through the I2C protocol conversion chip of the protocol conversion circuit, is converted into the I2C protocol, and then communicates with the I2C touchscreen socket.

[0047] In some embodiments, the USB signal output of the main control CPU processor of the device main board branches at the pin of the I2C protocol conversion chip of the protocol conversion circuit and passes through the resistor of the protocol conversion circuit nearby, and is connected to the USB touchscreen socket through the resistor.

[0048] In some embodiments, the resistor of the device main board is arranged close to the I2C protocol conversion chip.

[0049] In some embodiments, when the device main board uses a USB interface touchscreen, the path of the I2C protocol conversion chip is not soldered;

[0050] When using an I2C interface touchscreen, the resistor is not soldered.

[0051] In some embodiments, the display screen socket of the device main board is connected to the display screen through a cable.

[0052] In some embodiments, the I2C touchscreen socket of the device main board uses a 3Pin connector, which includes 2-way data signals Touch_Data and 1-way reference ground signal GND;

[0053] The USB touch screen socket uses a 3Pin connector, which includes 2-way data signals Touch_Data and 1-way reference ground signal GND.

[0054] In some embodiments, the main control CPU processor of the device motherboard uses a USB protocol interface for touch signal processing.

[0055] In an embodiment of the present application, a vehicle-mounted device is further provided, which includes the device motherboard described above.

[0056] 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 touch display circuit, wherein: The circuit includes: a main control CPU processor, a display screen socket, an I2C touch screen socket, a USB touch screen socket, and a protocol conversion circuit. The display screen socket is electrically connected to a display processing unit in the main control CPU processor, the I2C touch screen socket is connected to a touch processing unit in the main control CPU processor through the protocol conversion circuit, or the USB touch screen socket is connected to a touch processing unit in the main control CPU processor through the protocol conversion circuit.

2. The circuit as claimed in claim 1, wherein: The USB signal output of the main control CPU processor passes through the I2C protocol conversion chip of the protocol conversion circuit, is converted into the I2C protocol, and then connected to the I2C touch screen socket.

3. The circuit as claimed in claim 2, wherein: The USB signal output of the main control CPU processor is bifurcated at the pin of the I2C protocol conversion chip of the protocol conversion circuit and passes through the resistor of the protocol conversion circuit nearby, and is connected to the USB touch screen socket through the resistor.

4. The circuit as claimed in claim 3, wherein: The resistor is arranged close to the I2C protocol conversion chip.

5. The circuit as claimed in claim 3, wherein: When a USB interface touch screen is used, the resistor is welded instead of the path of the I2C protocol conversion chip; When an I2C interface touch screen is used, the path of the I2C protocol conversion chip is welded instead of the resistor.

6. The circuit as claimed in claim 1, wherein: The display screen socket is connected to the display screen through a cable.

7. The circuit as claimed in claim 1, wherein: The I2C touch screen socket adopts a 3-pin connector, which includes 2 data signals Touch_Data and 1 reference ground signal GND; The USB touch screen socket uses a 3-pin connector, which includes 2 data signals Touch_Data and 1 reference ground signal GND.

8. The circuit of claim 1, wherein: The main control CPU processor uses a USB protocol interface to process touch signals.

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

10. A vehicle-mounted device, wherein: Comprising the device mainboard as described in claim 9.

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