HDMI or DP display switching circuit and industrial personal computer

Abstract

The utility model aims to disclose a switching circuit for HDMI or DP display and an industrial personal computer, which relate to the technical field of industrial personal computer control and comprise a DP + + signal end, a single-pole double-throw electronic switch, a first resistor, a first triode, a second resistor, a DP + + HPD signal end, a DP interface and an HDMI interface. An HPD signal end of DP + + is connected with a feedback pin of the DP interface through a first diode; an HPD signal end of DP + + is connected with a feedback pin of the HDMI interface through a second diode; the first diode and the second diode share a cathode and are grounded through a third resistor; a collector electrode of the first triode is connected with a power supply through the first resistor and is also connected with a selection pin of the single-pole double-throw electronic switch; the beneficial effects of the utility model are that through the cooperation of the single-pole double-throw electronic switch, the first resistor, the first triode and the second resistor, the device can adapt to a DP interface and also can adapt to an HDMI interface, thereby facilitating the selection of a user.

Description

TECHNICAL FIELD

[0001] The utility model relates to industrial computer control technical field, especially a kind of switching circuit and industrial computer of HDMI or DP display. BACKGROUND

[0002] At present, the mainboard with DP++ function outputs video signal through HDMI interface or DP interface;User selects different video connection line according to display type, when the video connection line of user and interface do not match, often need to transform interface or replace video connection line, the mainboard with DP++ function still has the defects of insufficient compatibility and flexibility.

[0003] Therefore, it is necessary to develop a kind of switching circuit and industrial computer of HDMI or DP display to overcome the above technical problems. SUMMARY

[0004] To solve the above technical problems, the utility model discloses a kind of switching circuit and industrial computer of HDMI or DP display.

[0005] The first invention purpose of the utility model is to provide a kind of switching circuit of HDMI or DP display.

[0006] The second invention purpose of the utility model is to provide a kind of industrial computer.

[0007] To achieve the above first invention purpose, the utility model provides a kind of switching circuit of HDMI or DP display, including DP++ signal end, single-pole double-throw electronic switch, first resistance, first triode, second resistance, DP++ HPD signal end, DP interface and HDMI interface;

[0008] DP++ HPD signal end is connected the feedback pin of the DP interface by first diode;

[0009] DP++ HPD signal end is connected the feedback pin of the HDMI interface by second diode;

[0010] The first diode and the second diode are common cathode and are connected ground through third resistance;

[0011] The collector of the first triode is connected power supply through the first resistance, and the collector of the first triode is also connected the selection pin of the single-pole double-throw electronic switch;

[0012] The emitter of the first triode is connected ground, and the base of the first triode is connected the feedback pin of the DP interface and the anode of the first diode through the second resistance.

[0013] Preferably, the single-pole double-throw electronic switch comprises a plurality of DP signal output pins and a plurality of HDMI signal output pins;

[0014] The DP signal output pins are connected to the DP interface;

[0015] The HDMI signal output pins are connected to the HDMI interface.

[0016] Preferably, an AUX signal channel of DP++ and a DDC signal channel of DP++ are further included.

[0017] Preferably, the single-pole double-throw electronic switch is provided with a selection pin, a first pin and a second pin;

[0018] The selection pin and the first pin are connected by default.

[0019] Preferably, the selection pin is pulled to high level by the first resistor and the power supply, the first triode is cut off, and the MAIN LINK signal emitted by the DP++ signal end is connected to the HDMI interface through the HDMI signal output pin.

[0020] Preferably, when the DP interface is inserted into the video line, the feedback pin of the DP interface outputs high level, the base of the first triode is pulled to high level by the second resistor, and the first triode is turned on.

[0021] The selection pin becomes low level by grounding the first triode;

[0022] The MAIN LINK signal emitted by the DP++ signal end is connected to the DP interface through the DP signal output pin.

[0023] Preferably, the first triode is an NPN triode.

[0024] Preferably, when the DP interface and the HDMI interface are simultaneously inserted into the video line, the feedback pin of the DP interface outputs high level, the base of the first triode is pulled to high level by the second resistor, and the first triode is turned on.

[0025] The selection pin becomes low level by grounding the first triode;

[0026] The MAIN LINK signal emitted by the DP++ signal end is connected to the DP interface through the DP signal output pin.

[0027] Preferably, the DP++ signal end communicates data through the AUX signal channel and the DP interface;

[0028] The DP++ signal terminal communicates with the HDMI interface via the DDC signal channel.

[0029] Based on the same inventive principle, in order to achieve the second inventive objective mentioned above, this utility model provides an industrial control computer, which has the HDMI or DP display switching circuit described in the first invention.

[0030] Compared with the prior art, the technical effects of this utility model are as follows:

[0031] This invention, through the cooperation of a single-pole double-throw electronic switch, a first resistor, a first transistor, and a second resistor, can adapt to both DP and HDMI interfaces, providing convenience for users. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a block diagram of the switching circuit principle for HDMI or DP display of this utility model.

[0034] Figure 2 This is a circuit diagram for switching between HDMI and DP displays according to this utility model.

[0035] Figure 3 This is a utility model Figure 2 Enlarged diagram of the area within the dashed box. Detailed Implementation

[0036] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. However, it should be noted that these embodiments are not intended to limit the present invention. Equivalent transformations or substitutions in function, method, or structure made by those skilled in the art based on these embodiments are all within the protection scope of the present invention.

[0037] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. Embodiment 1

[0038] Refer Figures 1 to 3 , this embodiment discloses a specific implementation manner of a switching circuit for HDMI or DP display (hereinafter referred to as "circuit").

[0039] Refer to Figures 1 to 3 , in Figure 2 , the label 1 at both ends of the resistor represents the first end of the resistor, and the label 2 represents the second end of the resistor.

[0040] Refer to Figures 1 to 3 , the switching circuit for HDMI or DP display includes a DP++ signal terminal, a single-pole double-throw electronic switch U1, a first resistor R1, a first triode Q1, a second resistor R2, a DP++ HPD signal terminal, a DP interface, and an HDMI interface. The first triode Q1 is an NPN-type triode; the DP++ HPD signal terminal is connected to the feedback pin DP_HPD of the DP interface through a first diode D1. HPD (Hot Plug Detect) is a hot plug detection signal; the DP++ HPD signal terminal is connected to the feedback pin HDMI_HPD of the HDMI interface through a second diode D2; HPD (Hot Plug Detect) is a hot plug detection signal for notifying the source device of the change in the connection status of the display (insertion or removal); the first diode D1 and the second diode D2 share the cathode and are grounded through a third resistor R3. The first diode D1 and the second diode D2 form a common-cathode diode, and the cathode of the common-cathode diode is connected to the DP++ HPD signal terminal; the collector C of the first triode Q1 is connected to the power supply through the first resistor R1, and the collector C of the first triode is also connected to the selection pin SEL of the single-pole double-throw electronic switch U1; the emitter E of the first triode Q1 is grounded, and the base B of the first triode Q1 is connected to the feedback pin DP_HPD of the DP interface and the positive electrode of the first diode D2 through the second resistor R2.

[0041] Specifically, refer to Figures 1 to 3The DP++ signal terminal emits a MAIN LINK signal, which transmits a video signal to the DP interface or HDMI interface via a single-pole double-throw electronic switch U1. Specifically, the single-pole double-throw electronic switch U1 includes several DP signal output pins (pins 16-19 of U1) and several HDMI signal output pins (pins 32-45 of U1). The DP signal output pins are connected to the DP interface, and the HDMI signal output pins are connected to the HDMI interface. To transmit MAIN LINK signals, the circuit also includes a DP++ AUX signal channel and a DP++ DDC signal channel. The AUX signal channel (Auxiliary Channel) is an auxiliary channel of the DP interface, designed based on bidirectional differential signals, used to transmit control commands, status information, and a small amount of data. The DP++ signal terminal communicates with the DP interface through the AUX signal channel. The DDC signal channel (Display Data Channel) is the display data channel of the HDMI interface, used to transmit configuration information between the source device (such as a computer or game console) and the display device (such as a monitor or TV), ensuring that the two negotiate a compatible display mode. The DP++ signal terminal communicates with the HDMI interface through the DDC signal channel.

[0042] See Figure 2 and Figure 3 The single-pole double-throw electronic switch U1 has a selection pin SEL(A), a first pin B, and a second pin C. The selection pin SEL(A) and the first pin B are connected by default. When an HDMI cable is inserted, the selection pin SEL(A) is pulled high by the first resistor R1 and the power supply VCC, the first transistor Q1 is cut off, and the MAIN LINK signal emitted by the DP++ signal terminal is connected to the HDMI interface through the HDMI signal output pin to match the HDMI video cable. When a video cable is inserted into the DP interface, the feedback pin DP_HPD of the DP interface outputs a high level, the base B of the first transistor Q1 is pulled high by the second resistor R2, and the first transistor Q1 is turned on. The selection pin SEL becomes low through the first transistor grounded Q1, and the single-pole double-throw electronic switch U1 switches to connect the selection pin SEL(A) and the second pin C. The MAIN LINK signal emitted by the DP++ signal terminal is connected to the DP interface through the DP signal output pin.

[0043] See Figure 2 and Figure 3When both the DP and HDMI interfaces are plugged into a video cable, the DP_HPD feedback pin of the DP interface outputs a high level, the base B of the first transistor Q1 is pulled to a high level by the second resistor R2, and the first transistor Q1 is turned on; the selection pin SEL becomes low level through the grounding of the first transistor Q1, and the single-pole double-throw electronic switch U1 switches to the selection pin SEL(A) and connects to the second pin C; the MAIN LINK signal emitted by the DP++ signal terminal is connected to the DP interface through the DP signal output pin.

[0044] This embodiment achieves compatibility with both DP and HDMI interfaces, expanding the flexibility of the interfaces and freeing users from limitations on interface and cable type when selecting display devices. Example 2

[0045] This embodiment discloses a specific implementation of an industrial control computer. The industrial control computer has the HDMI or DP display switching circuit described in Embodiment 1, which makes the industrial control computer compatible with DP and HDMI interfaces, expands the flexibility of the interface, and allows users to no longer be limited by the interface and cable type when selecting display devices.

[0046] The switching circuit for HDMI or DP display used in the industrial control computer in Example 2 is described in Example 1 and will not be repeated here.

Claims

1. A switching circuit for HDMI or DP displays, characterized in that, Includes DP++ signal terminal, single-pole double-throw electronic switch, first resistor, first transistor, second resistor, DP++ HPD signal terminal, DP interface and HDMI interface; The HPD signal terminal of DP++ is connected to the feedback pin of the DP interface through a first diode; The HPD signal terminal of DP++ is connected to the feedback pin of the HDMI interface via a second diode; The first diode and the second diode share a common cathode and are grounded through a third resistor; The collector of the first transistor is connected to the power supply through the first resistor, and the collector of the first transistor is also connected to the selection pin of the single-pole double-throw electronic switch. The emitter of the first transistor is grounded, and the base of the first transistor is connected to the feedback pin of the DP interface and the positive terminal of the first diode through the second resistor.

2. The switching circuit for HDMI or DP display as described in claim 1, characterized in that, The single-pole double-throw electronic switch includes several DP signal output pins and several HDMI signal output pins; The DP signal output pin is connected to the DP interface; The HDMI signal output pin is connected to the HDMI interface.

3. The switching circuit for HDMI or DP display as described in claim 1 or 2, characterized in that, It also includes the AUX signal channel of DP++ and the DDC signal channel of DP++.

4. The switching circuit for HDMI or DP display as described in claim 2, characterized in that, The single-pole double-throw electronic switch is provided with a selection pin, a first pin, and a second pin; The selection pin and the first pin are connected by default.

5. The switching circuit for HDMI or DP display as described in claim 4, characterized in that, The selection pin is pulled high by the first resistor and the power supply, the first transistor is cut off, and the MAIN LINK signal emitted by the DP++ signal terminal is connected to the HDMI interface through the HDMI signal output pin.

6. The switching circuit for HDMI or DP display as described in claim 4, characterized in that, When the DP interface is plugged into a video cable, the feedback pin of the DP interface outputs a high level, the base of the first transistor is pulled to a high level by the second resistor, and the first transistor is turned on. The selection pin is grounded through the first transistor and becomes low level; The MAIN LINK signal emitted from the DP++ signal terminal is connected to the DP interface through the DP signal output pin.

7. The switching circuit for HDMI or DP display as described in claim 4, characterized in that, The first transistor is an NPN transistor.

8. The switching circuit for HDMI or DP display as described in claim 4, characterized in that, When the DP interface and the HDMI interface are plugged into the video cable at the same time, the feedback pin of the DP interface outputs a high level, the base of the first transistor is pulled to a high level by the second resistor, and the first transistor is turned on. The selection pin is grounded through the first transistor and becomes low level; The MAIN LINK signal emitted from the DP++ signal terminal is connected to the DP interface through the DP signal output pin.

9. The switching circuit for HDMI or DP display as described in claim 3, characterized in that, The DP++ signal terminal communicates data through the AUX signal channel and the DP interface; The DP++ signal terminal communicates with the HDMI interface via the DDC signal channel.

10. An industrial control computer, characterized in that, The industrial control computer has a switching circuit for HDMI or DP display as described in any one of claims 1-9.

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