Interface circuit compatible with DP signal and HDMI signal

Abstract

The utility model provides an interface circuit compatible with a DP signal and an HDMI signal, which comprises a power supply, a DP signal to HDMI signal output circuit and a DP signal display direct transmission circuit, the input end of the DP signal to HDMI signal output circuit and the input end of the DP signal display direct transmission circuit are connected with the output end of a central processing unit, and the output end of the central processing unit is connected with the output end of a USB interface. The output end of the DP signal to HDMI signal output circuit can be connected with the input end of the DP to HDMI conversion line, and the output end of the DP to HDMI conversion line and the output end of the DP signal display direct transmission circuit are connected with the input end of the display mainboard. The beneficial effects of the utility model are that one interface can output a DP signal to the DP-to-HDMI conversion line to complete conversion of an HDMI signal and then transmit the HDMI signal to the HDMI signal display mainboard, and can also directly transmit the DP signal to the DP signal display mainboard.

Description

Technical Field

[0001] The utility model relates to the technical field of interface circuits, in particular to an interface circuit compatible with DP signals and HDMI signals. Background Art

[0002] In the computer field, the central processing unit (CPU) is one of the main devices of electronic computers and the core component of computers. Its main function is to interpret computer instructions and process data in computer software. All operations in the computer are performed by the CPU, which is the core component responsible for reading instructions, decoding instructions and executing instructions. Now CPU is widely used in many electronic devices, such as mobile terminals, industrial control terminals, PCs, etc.

[0003] DP signal, namely DisplayPort signal, is a high-definition digital display interface signal standard, which can connect computers and monitors, or computers and home theaters. In terms of performance, DisplayPort 1.1 supports a maximum transmission bandwidth of 10.8Gb / S, and the HDMI 1.3 standard can support a bandwidth of 10.2G / s; in addition, DisplayPort can support resolutions such as WQXGA+ (2560×1600), QXGA (2048×1536) and 30 / 36bit (10 / 12bit per primary color) color depth, and the color of 1920×1200 resolution supports 120 / 24Bit. The ultra-high bandwidth and resolution are fully sufficient to adapt to the development of display devices.

[0004] HDMI signal, namely High Definition Multimedia Interface signal (English: High Definition Multimedia Interface, HDMI) is a digital video / audio interface technology. It is a dedicated digital interface suitable for image transmission. It can transmit audio and image signals at the same time. The maximum data transmission speed is 2.25GB / s, and there is no need for digital / analog or analog / digital conversion before signal transmission. HDMI can be used with broadband digital content protection (HDCP) to prevent copyrighted audio and video content from being copied without authorization. The extra space provided by HDMI can be applied to audio and video formats that will be upgraded in the future. And because a 1080p video and an 8-channel audio signal require less than 0.5GB / s, HDMI still has a lot of margin. This allows it to use one cable to connect DVD players, receivers and PRRs respectively.

[0005] At present, the display signal of the display motherboard is usually a DP or HDMI signal sent by the central processing unit, which is received by the display motherboard of the display screen and finally displayed on the display screen. The display motherboard can usually only directly display one display signal. The most widely used display motherboards are HDMI signal display motherboards and DP signal display motherboards. Therefore, when using a display with a DP signal display motherboard, it is necessary to select the DP signal output interface of the central processing unit; when using a display with an HDMI signal display motherboard, it is necessary to switch to select the HDMI signal output interface of the central processing unit. Switching at the central processing unit is very troublesome, and two signal output interfaces, the DP signal output interface and the HDMI signal output interface, need to be set, which increases the production cost of the product and does not provide a good user experience. Utility Model Content

[0006] In order to solve the problems in the prior art, the utility model provides an interface circuit compatible with DP signals and HDMI signals, which is arranged between the central processing unit and the display mainboard. Through the DP signal to HDMI signal output circuit and the DP signal display direct transmission circuit that cooperate with each other, an interface is achieved that can output the DP signal to the DP to HDMI conversion line to complete the conversion of the HDMI signal and then transmit it to the HDMI signal display mainboard, and can also transmit the DP signal directly to the DP signal display mainboard. The utility model is simple to use, saves time and effort, and solves the problem in the prior art that the HDMI signal display mainboard and the DP signal display mainboard need to frequently switch the display signal output interface of the central processing unit, which is very troublesome.

[0007] The utility model provides an interface circuit compatible with DP signals and HDMI signals, which is arranged between a central processing unit and a display mainboard, and comprises a power supply, a DP signal to HDMI signal output circuit and a DP signal display direct transmission circuit. The input end of the DP signal to HDMI signal output circuit and the input end of the DP signal display direct transmission circuit are connected to the output end of the central processing unit. The power supply is connected to the DP signal to HDMI signal output circuit and the DP signal display direct transmission circuit for power supply. The output end of the DP signal to HDMI signal output circuit can be connected to the input end of a DP to HDMI conversion line. The output end of the DP to HDMI conversion line and the output end of the DP signal display direct transmission circuit are connected to the input end of the display mainboard. The DP signal to HDMI signal output circuit can output the DP signal sent by the central processing unit to the DP to HDMI conversion line to complete the conversion of the HDMI signal and then transmit it to the HDMI signal display mainboard. The DP signal display direct transmission circuit can directly transmit the DP signal sent by the central processing unit to the DP signal display mainboard.

[0008] The utility model is further improved, the DP signal to HDMI signal output circuit includes a DP signal output interface, a transistor Q7, a field effect transistor Q8, a field effect transistor Q6, a field effect transistor Q41 and a resistor R1276, wherein the DP signal output interface is provided with 20 pins, the 13th pin of the DP signal output interface is connected to one end of the resistor R1276, the other end of the resistor R1276 is connected to the base of the transistor Q7, the collector of the transistor Q7 is connected to the gate of the field effect transistor Q8, the drain of the field effect transistor Q8 is connected to the field The gate of the field effect transistor Q6 is connected to the gate of the field effect transistor Q41, the source of the field effect transistor Q6 and the drain of the field effect transistor Q41 are connected to the output end of the central processing unit, the drain of the field effect transistor Q6 is connected to the 17th pin of the DP signal output interface, the source of the field effect transistor Q41 is connected to the 15th pin of the DP signal output interface, the 1st, 3rd, 4th, 6th, 7th, 9th, 10th and 12th pins of the DP signal output interface are connected to the input end of the display mainboard, and the emitter of the transistor Q7 and the source of the field effect transistor Q8 are grounded.

[0009] The utility model is further improved, the DP signal to HDMI signal output circuit also includes a resistor R211, a resistor R208 and a resistor R1275, wherein one end of the resistor R1275 is connected to the 13th pin of the DP signal output interface and one end of the resistor R1276, one end of the resistor R211 is connected to the output end of the power supply, the other end of the resistor R211 is connected to the drain of the field effect transistor Q41 and the output end of the central processing unit, one end of the resistor R208 is connected to the output end of the power supply, the other end of the resistor R208 is connected to the source of the field effect transistor Q6 and the output end of the central processing unit, and the other end of the resistor R1275 is grounded.

[0010] The utility model is further improved, the DP signal to HDMI signal output circuit also includes a resistor R211, a resistor R208 and a resistor R1275, wherein one end of the resistor R1275 is connected to the 13th pin of the DP signal output interface and one end of the resistor R1276, one end of the resistor R211 is connected to the output end of the power supply, the other end of the resistor R211 is connected to the drain of the field effect transistor Q41 and the output end of the central processing unit, one end of the resistor R208 is connected to the output end of the power supply, the other end of the resistor R208 is connected to the source of the field effect transistor Q6 and the output end of the central processing unit, and the other end of the resistor R1275 is grounded.

[0011] The utility model is further improved, the DP signal display direct transmission circuit also includes a resistor R461 and a resistor R462, wherein one end of the resistor R461 is connected to the output end of the power supply, the other end of the resistor R461 is connected to the source of the field effect transistor Q553 and one end of the capacitor C360, one end of the resistor R462 is connected to the source of the field effect transistor Q551 and one end of the capacitor C362, and the other end of the resistor R462 is grounded.

[0012] The utility model is further improved in that the resistance value of the resistor R1276 is 10KΩ.

[0013] The utility model is further improved in that the resistance value of the resistor R1275 is 1MΩ, and the resistance values ​​of the resistor R208 and the resistor R211 are both 2.2KΩ.

[0014] The utility model is further improved in that the resistance value of the resistor R461 and the resistance value of the resistor R462 are both 100KΩ.

[0015] Compared with the prior art, the beneficial effects of the utility model are as follows: an interface circuit compatible with DP signals and HDMI signals is provided, which is arranged between a central processing unit and a display mainboard; through a DP signal to HDMI signal output circuit and a DP signal display direct transmission circuit that cooperate with each other, the DP signal to HDMI signal output circuit can output the DP signal sent by the central processing unit to the DP to HDMI conversion line to complete the conversion of the HDMI signal and then transmit it to the HDMI signal display mainboard; the DP signal display direct transmission circuit can directly transmit the DP signal sent by the central processing unit to the DP signal display mainboard, thereby achieving the purpose that an interface can output the DP signal to the DP to HDMI conversion line to complete the conversion of the HDMI signal and then transmit it to the HDMI signal display mainboard, and can also directly transmit the DP signal to the DP signal display mainboard; no matter whether the display mainboard is an HDMI signal display mainboard or a DP signal display mainboard, there is no need to switch the signal output interface, the use is simple, time-saving and labor-saving, and the problem that the HDMI signal display mainboard and the DP signal display mainboard in the prior art need to frequently switch the display signal output interface of the central processing unit, which is very troublesome, is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the solutions in the present application or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1The utility model is a circuit diagram of an interface circuit compatible with DP signals and HDMI signals. DETAILED DESCRIPTION

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0019] 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 application. The appearance of the phrase in various locations 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.

[0020] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0021] like Figure 1As shown, the utility model provides an interface circuit compatible with DP signals and HDMI signals, which is arranged between a central processing unit and a display mainboard, and includes a power supply, a DP signal to HDMI signal output circuit and a DP signal display direct transmission circuit. The input end of the DP signal to HDMI signal output circuit and the input end of the DP signal display direct transmission circuit are connected to the output end of the central processing unit, the power supply is connected to the DP signal to HDMI signal output circuit and the DP signal display direct transmission circuit for power supply, the output end of the DP signal to HDMI signal output circuit can be connected to the input end of a DP to HDMI conversion line, and the output end of the DP to HDMI conversion line and the output end of the DP signal display direct transmission circuit are connected to the input end of the display mainboard. In this embodiment, the DP signal to HDMI signal output circuit can output the DP signal sent by the central processing unit to the DP to HDMI conversion line to complete the conversion of the HDMI signal and then transmit it to the HDMI signal display mainboard. The DP signal display direct transmission circuit can directly transmit the DP signal sent by the central processing unit to the DP signal display mainboard, thereby realizing an interface that can output the DP signal to the DP to HDMI conversion line to complete the conversion of the HDMI signal and then transmit it to the HDMI signal display mainboard, and can also transmit the DP signal directly to the DP signal display mainboard. Regardless of whether the display mainboard is an HDMI signal display mainboard or a DP signal display mainboard, there is no need to switch the signal output interface, which is simple to use and saves time and effort.

[0022] like Figure 1As shown, the DP signal to HDMI signal output circuit includes a DP signal output interface, a transistor Q7, a field effect transistor Q8, a field effect transistor Q6, a field effect transistor Q41 and a resistor R1276. The DP signal output interface is provided with 20 pins. The 13th pin of the DP signal output interface is connected to one end of the resistor R1276, the other end of the resistor R1276 is connected to the base of the transistor Q7, the collector of the transistor Q7 is connected to the gate of the field effect transistor Q8, the drain of the field effect transistor Q8 is connected to the gate of the field effect transistor Q6 and the gate of the field effect transistor Q41, the source of the field effect transistor Q6 and the drain of the field effect transistor Q41 are connected to the output end of the central processing unit, the drain of the field effect transistor Q6 is connected to the 17th pin of the DP signal output interface, the source of the field effect transistor Q41 is connected to the 15th pin of the DP signal output interface, the 1st, 3rd, 4th, 6th, 7th, 9th, 10th, Pin 12 is connected to the input end of the display mainboard, the emitter of the transistor Q7 and the source of the field effect transistor Q8 are grounded; the DP signal to HDMI signal output circuit also includes a resistor R211, a resistor R208 and a resistor R1275, one end of the resistor R1275 is connected to the 13th pin of the DP signal output interface and one end of the resistor R1276, one end of the resistor R211 is connected to the output end of the power supply, the other end of the resistor R211 is connected to the drain of the field effect transistor Q41 and the output end of the central processing unit, one end of the resistor R208 is connected to the output end of the power supply, the other end of the resistor R208 is connected to the source of the field effect transistor Q6 and the output end of the central processing unit, and the other end of the resistor R1275 is grounded; wherein, the resistance value of the resistor R1276 is 10KΩ, the resistance value of the resistor R1275 is 1MΩ, and the resistance values ​​of the resistor R208 and the resistor R211 are both 2.2KΩ. In this embodiment, the DP signal to HDMI signal output circuit is used to output the DP signal sent by the central processor to the DP to HDMI conversion line to complete the conversion of the HDMI signal and then transmit it to the HDMI signal display mainboard.

[0023] like Figure 1As shown, the DP signal to HDMI signal output circuit also includes a resistor R211, a resistor R208 and a resistor R1275, one end of the resistor R1275 is connected to the 13th pin of the DP signal output interface and one end of the resistor R1276, one end of the resistor R211 is connected to the output end of the power supply, the other end of the resistor R211 is connected to the drain of the field effect tube Q41 and the output end of the central processing unit, one end of the resistor R208 is connected to the output end of the power supply, the other end of the resistor R208 is connected to the source of the field effect tube Q6 and the output end of the central processing unit The output end of the device is connected, and the other end of the resistor R1275 is grounded; the DP signal display direct transmission circuit also includes a resistor R461 and a resistor R462, one end of the resistor R461 is connected to the output end of the power supply, the other end of the resistor R461 is connected to the source of the field effect tube Q553 and one end of the capacitor C360, one end of the resistor R462 is connected to the source of the field effect tube Q551 and one end of the capacitor C362, and the other end of the resistor R462 is grounded; wherein the resistance value of the resistor R461 and the resistance value of the resistor R462 are both 100KΩ. In this embodiment, the DP signal display direct transmission circuit is used to directly transmit the DP signal sent by the central processing unit to the DP signal display mainboard.

[0024] As can be seen from the above, the utility model provides an interface circuit compatible with DP signals and HDMI signals, which is arranged between a central processing unit and a display mainboard. Through the DP signal to HDMI signal output circuit and the DP signal display direct transmission circuit that cooperate with each other, the DP signal to HDMI signal output circuit can output the DP signal sent by the central processing unit to the DP to HDMI conversion line to complete the conversion of the HDMI signal and then transmit it to the HDMI signal display mainboard. The DP signal display direct transmission circuit can directly transmit the DP signal sent by the central processing unit to the DP signal display mainboard, thereby achieving an interface that can output the DP signal to the DP to HDMI conversion line to complete the conversion of the HDMI signal and then transmit it to the HDMI signal display mainboard, and can also directly transmit the DP signal to the DP signal display mainboard. Regardless of whether the display mainboard is an HDMI signal display mainboard or a DP signal display mainboard, there is no need to switch the signal output interface. The use is simple, time-saving and labor-saving, and the problem that the HDMI signal display mainboard and the DP signal display mainboard in the prior art need to frequently switch the display signal output interface of the central processing unit, which is very troublesome, is solved.

[0025] The specific implementation modes described above are preferred implementation modes of the present utility model, and are not intended to limit the specific implementation scope of the present utility model. The scope of the present utility model includes but is not limited to the specific implementation modes, and all equivalent changes made in accordance with the present utility model are within the protection scope of the present utility model.

Claims

1. An interface circuit compatible with DP signals and HDMI signals, arranged between a central processing unit and a display mainboard, characterized in that: The invention comprises a power supply, a DP signal to HDMI signal output circuit and a DP signal display direct transmission circuit. The input end of the DP signal to HDMI signal output circuit and the input end of the DP signal display direct transmission circuit are connected to the output end of the central processing unit. The power supply is connected to the DP signal to HDMI signal output circuit and the DP signal display direct transmission circuit for power supply. The output end of the DP signal to HDMI signal output circuit can be connected to the input end of a DP to HDMI conversion line. The output end of the DP to HDMI conversion line and the output end of the DP signal display direct transmission circuit are connected to the input end of the display mainboard. The DP signal to HDMI signal output circuit can output the DP signal sent by the central processing unit to the DP to HDMI conversion line to complete the conversion of the HDMI signal and then transmit it to the HDMI signal display mainboard. The DP signal display direct transmission circuit can directly transmit the DP signal sent by the central processing unit to the DP signal display mainboard.

2. The interface circuit compatible with DP signal and HDMI signal according to claim 1, characterized in that: The DP signal to HDMI signal output circuit includes a DP signal output interface, a transistor Q7, a field effect transistor Q8, a field effect transistor Q6, a field effect transistor Q41 and a resistor R1276, wherein the DP signal output interface is provided with 20 pins, the 13th pin of the DP signal output interface is connected to one end of the resistor R1276, the other end of the resistor R1276 is connected to the base of the transistor Q7, the collector of the transistor Q7 is connected to the gate of the field effect transistor Q8, the drain of the field effect transistor Q8 is connected to the drain of the field effect transistor Q6 The gate and the gate of the field effect tube Q41 are connected, the source of the field effect tube Q6 and the drain of the field effect tube Q41 are connected to the output end of the central processing unit, the drain of the field effect tube Q6 is connected to the 17th pin of the DP signal output interface, the source of the field effect tube Q41 is connected to the 15th pin of the DP signal output interface, the 1st, 3rd, 4th, 6th, 7th, 9th, 10th and 12th pins of the DP signal output interface are connected to the input end of the display mainboard, and the emitter of the transistor Q7 and the source of the field effect tube Q8 are grounded.

3. The interface circuit compatible with DP signal and HDMI signal according to claim 2, characterized in that: The DP signal to HDMI signal output circuit also includes a resistor R211, a resistor R208 and a resistor R1275, wherein one end of the resistor R1275 is connected to the 13th pin of the DP signal output interface and one end of the resistor R1276, one end of the resistor R211 is connected to the output end of the power supply, the other end of the resistor R211 is connected to the drain of the field effect transistor Q41 and the output end of the central processing unit, one end of the resistor R208 is connected to the output end of the power supply, the other end of the resistor R208 is connected to the source of the field effect transistor Q6 and the output end of the central processing unit, and the other end of the resistor R1275 is grounded.

4. The interface circuit compatible with DP signal and HDMI signal according to claim 3, characterized in that: The DP signal display direct transmission circuit includes a field effect transistor Q551, a field effect transistor Q553, a capacitor C360 and a capacitor C362, wherein the drain of the field effect transistor Q553 is connected to the drain of the field effect transistor Q6 and the 17th pin of the DP signal output interface, the source of the field effect transistor Q553 is connected to one end of the capacitor C360, and the other end of the capacitor C360 is connected to the output end of the central processing unit, the gate of the field effect transistor Q553 is connected to the gate of the field effect transistor Q551, the collector of the transistor Q7, and the gate of the field effect transistor Q8, the drain of the field effect transistor Q551 is connected to the source of the field effect transistor Q41 and the 15th pin of the DP signal output interface, the source of the field effect transistor Q551 is connected to one end of the capacitor C362, and the other end of the capacitor C362 is connected to the output end of the central processing unit.

5. The interface circuit compatible with DP signal and HDMI signal according to claim 4, characterized in that: The DP signal display direct transmission circuit also includes a resistor R461 and a resistor R462, wherein one end of the resistor R461 is connected to the output end of the power supply, the other end of the resistor R461 is connected to the source of the field effect transistor Q553 and one end of the capacitor C360, one end of the resistor R462 is connected to the source of the field effect transistor Q551 and one end of the capacitor C362, and the other end of the resistor R462 is grounded.

6. The interface circuit compatible with DP signal and HDMI signal according to claim 5, characterized in that: The resistance of the resistor R1276 is 10KΩ.

7. The interface circuit compatible with DP signal and HDMI signal according to claim 6, characterized in that: The resistance value of the resistor R1275 is 1 MΩ, and the resistance values ​​of the resistor R208 and the resistor R211 are both 2.2 KΩ.

8. The interface circuit compatible with DP signal and HDMI signal according to claim 7, characterized in that: The resistance value of the resistor R461 and the resistance value of the resistor R462 are both 100KΩ.

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