TWI621990B - Switch circuit for graphic modules, motherboard and computer utilizing the same - Google Patents

Abstract

A display module switching circuit for switching a first display module and a second display module, comprising a signal processing module and a control module. The first identification of the signal processing module is used to connect the identification of the first display module, and the first and second enable ports of the signal processing module respectively connect the enable of the first and second display modules. . The control module is respectively connected to the enabler of the first display module and the enabler of the second display module, and the control module includes a switching unit for completing the control module in the first working mode and the second working mode. When the control module is in different working modes, the signal processing module outputs different enable signals. The invention also provides a motherboard and a computer using the display module switching circuit.

Description

Display module switching circuit, motherboard and computer using the same

The invention relates to a display module switching circuit, and to a motherboard and a computer using the display module switching circuit.

Some computers include an integrated display card on a computer motherboard and at least one independent display card, and the at least one independent display card can be plugged and unplugged for user upgrade. When the computer is connected to the independent display card, the computer motherboard will recognize that the independent display card is connected and control the work of the independent display card, the integrated display card does not work, and the independent display card works to output the image signal to the monitoring device of the computer; When the computer is not connected to the independent display card, the computer motherboard recognizes that the integrated display card is not connected at this time, and controls the integrated display card to output an image signal to the monitoring device of the computer. However, when the motherboard slot is connected to a separate display card but the independent display card fails and the system fails to work properly, the system cannot switch to the integrated display card and work in time.

In view of this, it is necessary to provide a display module switching circuit that can switch the monitoring output source, a motherboard that uses the display module switching circuit, and a computer.

A display module switching circuit is configured to switch between a first display module and a second display module on a computer motherboard, the display module switching circuit comprising: a signal processing module, the first identification of the signal processing module is used to connect the identification of the first display module, and the first signal of the signal processing module is connected to the signal of the first display module, The first enabler of the signal processing module is connected to the enabler of the first display module; the second signal of the signal processing module is connected to the signal of the second display module, and the signal processing module is And an enable module for connecting the second display module; and a control module, wherein the control module is respectively connected to the enable unit of the first display module and the enable unit of the second display module, The control module includes a switching unit, and the switching unit is configured to complete switching between the first working mode and the second working mode of the control module. When the control module is in the first working mode, the first display module The first display module is enabled to receive the first enable signal, and the second display module is enabled to receive the second enable signal when the control module is in the second working mode, the second Display module work.

A motherboard includes the display module switching circuit, and the motherboard further includes a first display module and a second display module.

A computer that includes the motherboard.

When the computer motherboard is connected to the first display module and the second display module but the first display module is abnormal, the display module switching circuit can enable the computer motherboard to enable the second display module to continue working.

100‧‧‧Display module switching circuit

200‧‧‧ computer

300‧‧‧ motherboard

10‧‧‧First display module

20‧‧‧Second display module

30‧‧‧Signal Processing Module

40‧‧‧Monitor

50‧‧‧Control module

60‧‧‧Switch unit

R1-R5‧‧‧ resistance

V1, V2‧‧‧ voltage input

K‧‧ switch

Q1, Q2‧‧‧ field effect transistor

C1‧‧‧ capacitor

1 is a circuit diagram of a preferred embodiment of a display module switching circuit of the present invention.

Please refer to FIG. 1 , the display module switching circuit 100 is located on the motherboard 300 of the computer 200 , and the display module switching circuit 100 is used to work on the first display module 10 of the motherboard 300 . When the abnormality is caused, the motherboard 300 enables the second display module 20. A preferred embodiment of the display module switching circuit 100 includes a signal processing module 30 and a control module 50.

The first identification 埠3 of the signal processing module 30 is used to connect the identification 埠1 of the first display module 10. The first signal 埠4 of the signal processing module 30 is connected to the signal of the first display module 埠The first enabler 埠 5 of the signal processing module 30 is connected to the enable 埠 3 of the first display module 10; the second signal 埠 7 of the signal processing module 30 is connected to the second display module 20 The second enable 埠6 of the signal processing module 30 is connected to the enable 埠2 of the second display module 20, and the second identification 埠9 of the signal processing module 30 is used to connect to the monitoring device 40. The third signal 埠8 of the signal processing module 30 is connected to the signal 埠1 of the monitoring device 40. The control module 50 is connected to the enabler 3 of the first display module 10 and the signal 埠3 of the second display module 20, and the control module 50 includes a switching unit 60 for completing the The control module 50 switches between the first mode of operation and the second mode of operation. The signal processing module 30 outputs the image signal received by the signal processing module 30 from the first signal 埠4 or the second signal 埠7 to the monitoring device 40 through the third signal 埠8, and the monitoring device 40 displays the image. .

In this embodiment, the switching unit 60 is a single-pole single-throw switch K, and the second display module 20 is a south bridge chip integrated on the motherboard 300. The south bridge chip integrates a monitoring chip, and the first display module 10 includes an independent The display card, the signal processing module 30 is a function switching chip integrated on the motherboard 300.

The control module 50 includes resistors R1-R3, a field effect transistor Q1, a field effect transistor Q2, and a capacitor C1. The first end of the switch K is connected to the voltage input terminal V2 through the resistor R1. The second end of the switch K is connected to the gate of the field effect transistor Q1, the second end of the switch K is also connected to the source of the field effect transistor Q2 through the resistor R3, and the second end of the switch K is also transmitted through the resistor R2. Connected to the drain of the field effect transistor Q1. The source of the field effect transistor Q1 is grounded, the drain of the field effect transistor Q1 is grounded through a capacitor C1, and the drain of the field effect transistor Q1 is connected to The first display module 10 is enabled 埠3, and the drain of the field effect transistor Q1 is also connected to the gate of the field effect transistor Q2. The drain of the field effect transistor Q2 is connected to the enable 埠2 of the second display module 20 and the general-purpose input/output 埠1.

The enable 埠2 of the second display module 20 is grounded through the resistor R4. The identification 埠1 of the first display module 10 is connected to the voltage input terminal V1 through a resistor R5.

When the motherboard 300 is connected to the first display module 10 and the second display module 20, the first display module 10 outputs a low level signal to the signal processing module 30 through the identification 埠1. The first identification 埠3, when the first identification 埠3 of the signal processing module 30 receives the low level signal, the signal processing module 30 outputs a high level signal to the first display module 10 through the first enable 埠5. The enabler 3, the first display module 10 starts to work.

If the motherboard 300 is only connected to the second display module 20 and is not connected to the first display module 10, the first identifier 3 of the signal processing module 30 receives the high level signal input by the voltage input terminal V1. The group 30 outputs a high level signal to the enable 埠2 of the second display module 20 through the second enable 埠6, and the second display module 20 starts to work.

The control module 50 is preset to be in the first working mode. In the first working mode, the control module 50 does not affect the operations of the first display module 10, the second display module 20, and the signal processing module 30. In this embodiment, when the switch K is turned off, the control module 50 is in the first working mode. At this time, the gate of the field effect transistor Q1 is at a low level, and the drain of the field effect transistor Q1 is disconnected from the source. The gate of the field effect transistor Q2 is at a high level, and the drain of the field effect transistor Q2 is disconnected from the source. The first display module 10, the second display module 20, and the signal processing module 30 operate normally.

When the motherboard 300 is connected to the first display module 10 but the first display module 10 is not working normally, the signal processing module 30 cannot automatically switch to the second display module 20. After the switch K is closed, the control module 50 enters a second working mode, and the field effect transistor Q1 is turned off and the source is When the enable 埠3 of the first display module 10 is grounded to a low level, the first display module 10 stops working. The field effect transistor Q2 is delayed in turn by the delay circuit formed by the capacitor C1 and the resistor R2. After the delay time, the gate of the field effect transistor Q2 is grounded to a low level, and the drain and source of the field effect transistor Q2 are turned on. The enable 埠2 of the second display module 20 receives a high level signal, and the second display module 20 starts to work. In the embodiment, the delay circuit is configured to prevent the first display module 10 and the second display module 20 from working simultaneously.

When the general-purpose input/output 埠1 of the second display module 20 receives a high level, the motherboard 300 monitors the abnormality of the first display module 10 in the startup interface. In this embodiment, the first display module 10 The independent display card is the MXM system. During the startup self-test of the BIOS of the motherboard 300, if the general input/output interface 1 of the second display module 20 receives a high level, the BIOS will prompt “MXM Card Damaged” information on the self-test screen. In order to prompt the user to check the first display module 10.

The field effect transistor Q1 is an N-channel field effect transistor, and the field effect transistor Q2 is a P-channel field effect transistor.

When the first display module 10 is abnormal, the user can enable the second display module 20 by the motherboard 300 to continue to obtain image monitoring.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims.

Claims (10)

A display module switching circuit for switching a first display module and a second display module on a computer motherboard, the display module switching circuit comprising: a signal processing module, the first identification of the signal processing module An identifier for connecting the first display module, the first signal of the signal processing module is connected to the signal of the first display module, and the first enable of the signal processing module is connected to the first display The enablement of the module; the second signal of the signal processing module is connected to the signal of the second display module, and the second enable of the signal processing module is connected to the enable of the second display module. And a control module, the control module is respectively connected to the enabler of the first display module and the enabler of the second display module, the control module includes a switching unit, and the switching unit is configured to complete the control Switching between the first working mode and the second working mode, when the control module is in the first working mode, the first display module is enabled to receive the first enabling signal, the first display mode Group work; the control module is in the second job In the mode, the second display module is enabled to receive the second enable signal, and the second display module is in operation; the control module includes a first field effect transistor, a first resistor, a second resistor, and a first capacitor The switching unit is a single-pole single-throw switch, the first end of the switch is connected to a first voltage input end through a first resistor, and the second end of the switch is connected to the gate of the first field effect transistor, the switch The second end is further connected to the drain of the first field effect transistor through a second resistor, the source of the first field effect transistor is grounded, and the drain of the first field effect transistor is grounded through the first capacitor, the first field effect The drain of the transistor is coupled to the enable enable of the first display module. The display module switching circuit of claim 1, wherein the control module further includes a third resistor and a second field effect transistor, wherein the identification of the second display module is grounded through a fourth resistor, The identification of the first display module is connected to a second voltage input through a fifth resistor, and the second end of the switch is further connected to the source of the second field effect transistor through a third resistor, the first field effect The drain of the transistor is also connected to the gate of the second field effect transistor, and the drain of the second field effect transistor is connected to the identification of the second display module. The display module switching circuit of claim 2, wherein the first capacitor and the second resistor form a delay circuit for delaying a level change of the second field effect transistor gate. The display module switching circuit of claim 2, wherein the second display module is integrated on a computer motherboard, the second display module further includes a universal input/output port, and the universal input/output port is connected. The drain of the second field effect transistor. The display module switching circuit of claim 2, wherein the first field effect transistor is an N-channel field effect transistor, and the second field effect transistor is a P-channel field effect transistor. The display module switching circuit of claim 4, wherein when the universal input/output 埠 of the second display module is at a high level, the computer motherboard prompts the first display module to operate abnormally in the startup interface. The display module switching circuit of claim 1, wherein the second identification port of the signal processing module is configured to connect to an identification device of the monitoring device, and the third signal of the signal processing module is connected to the monitoring device. The signal of the device is 埠. A motherboard, wherein the motherboard includes the display module switching circuit of any one of claims 1-7, wherein the motherboard further includes a first display module and a second display module. A computer, wherein the computer comprises a motherboard as described in claim 8 of the patent application. The computer of claim 9, wherein the computer further comprises a monitoring device that receives the image signal output by the first display module or the second display module to display the image.