TWI595359B - Remote control system, keyboard-video-mouse (kvm) switch, and mouse cursor displaying method - Google Patents

Description

Remote control system, multi-computer switcher and mouse cursor display method

The invention relates to the display of a mouse cursor, in particular to a remote control system, a KVM switch and a mouse cursor display method.

The Keyboard-Video-Mouse Switch (KVM Switch) allows users to simultaneously control multiple computers through a single set of keyboards, screens and mice, while the IP-based KVM Switch Further, users of desktop or notebook computers can manage multiple remotely controlled computers through the network and view the images transmitted from the controlled computers via the network. The network type KVM switch converts the image signal outputted by the controlled computer into a network packet and transmits it to the host computer. The host computer also converts the keyboard or mouse signal into a network packet and transmits it to the network. KVM switch. For example, a Taiwan-based manager can remotely manage or control a server located in a US computer room through a networked KVM switch.

Please refer to FIG. 1A. FIG. 1A is a schematic diagram showing a remote control system in the prior art. As shown in FIG. 1A, the remote control system CS includes at least one host computer 11, at least one controlled computer 12, and a KVM switch 13. The KVM switch 13 is electrically coupled between the at least one host computer 11 and the at least one controlled computer 12. In this embodiment, at least one of the main control computers 11 communicates with the KVM switch 13 through the network N, and at least one of the controlled computers 12 is electrically coupled to the KVM switch 13.

In fact, the number of at least one master computer 11 and at least one controlled computer 12 may be determined according to actual needs, and there is no specific limitation; the network N may be any type of wireless network or wired network; at least one master The computer 11 can also be transmitted through any type of transmission line (such as USB transmission The power line or Cat5 transmission line is electrically coupled to the KVM switch 13.

FIG. 1B is a detailed functional block diagram of the KVM switch 13 in FIG. 1A. As shown in FIG. 1B, the KVM switch 13 includes a communication unit 130, a processing unit 131, a storage unit 132, an encoding unit 133, and a capture unit 134. The capturing unit 134 is electrically coupled to the at least one controlled computer 12 . The communication unit 130 includes a network communication interface 1300. The network communication interface 1300 communicates with at least one host computer 11 via the network N. The storage unit 132 includes a capture screen buffer 1322 and an encoded data buffer 1324. The capture picture buffer 1322 is electrically coupled to the coding unit 133 and the capture unit 134, respectively. The coded data buffer 1324 is electrically coupled between the processing unit 131 and the encoding unit 133. The processing unit 131 directly transmits the mouse status information PMI (including the mouse cursor position) to the controlled computer 12 through the mouse output hole 135 on the KVM switch 13.

However, in the current application, when the user views the screen of the remote controlled computer 12 through the screen of the host computer 11, it is necessary to go through the position of the mouse cursor from the far end until the mouse cursor is actually drawn. The same signal transmission path as the general screen data update, each step takes a certain time, resulting in the remote mouse cursor displayed on the screen of the host computer 11 (such as the solid cursor CSR1 shown in Figure 1C) When moving, compared to the remote mouse cursor on the screen of the controlled computer 12 (such as the hollow cursor CSR2 shown in Figure 1D, the mouse cursor moving direction DOM is moving to the right), there is a sense of delay, and the update frequency Slower, making the user inconvenient in handling.

Therefore, the present invention provides a remote control system, a KVM switch, and a mouse cursor display method to solve the above problems encountered in the prior art.

A specific embodiment of the present invention is a KVM switch. In this embodiment, the KVM switch is coupled between the at least one main control computer and the at least one controlled computer. The KVM switch includes a storage unit, a coding unit, and a communication unit. The storage unit contains a list of mouse events. The mouse event queue is used to temporarily store the mouse status information transmitted by the host computer, the mouse event queue, and the mouse status information is converted into a mouse state related specific area command. The coding unit is electrically coupled to the mouse event queue in the storage unit for referring to the mouse state related specific The zone command preferentially encodes a particular area of the controlled computer screen of the controlled computer to generate the mouse cursor encoded material. The specific area is related to the mouse cursor. The communication unit is electrically coupled to the processing unit, the encoded data buffer and the encoding unit in the storage unit, and is configured to transmit the mouse cursor encoded data to the main control computer via the encoded data buffer, the processing unit and the communication unit in the storage unit. The main control computer updates the main control computer screen displayed by the main control computer according to the mouse cursor coding data.

In an embodiment, the KVM switch further includes a capture unit. The capture unit is electrically coupled to the control computer for referring to the mouse status information to capture the controlled computer screen of the controlled computer. The controlled computer screen is the entire screen displayed by the controlled computer or contains a specific set of regions related to the mouse cursor, and the specific regions are grouped into one or more specific regions.

In one embodiment, the communication unit includes a network communication interface, and the network communication interface communicates with the host computer through the network.

In an embodiment, the mouse status information includes a mouse cursor position and a mouse button state, and the specific area is formed according to the mouse cursor position and a specific rule, and the specific area including the mouse cursor position and the surrounding mouse cursor may appear. region.

In an embodiment, the storage unit further includes a capture screen buffer electrically coupled between the capture unit and the encoding unit for temporarily storing the controlled computer screen captured by the capture unit for the coding unit Encode.

In an embodiment, the storage unit further includes an encoded data buffer electrically coupled between the encoding unit, the processing unit, and the communication unit, and the encoded data buffer is used by the temporary storage unit and transmitted to the encoded data buffer. The mouse cursor encoding data, the mouse cursor encoding data is sent to the main control computer through the communication unit.

Another embodiment of the present invention is a mouse cursor display method. In this embodiment, the mouse cursor display method is applied to a KVM switch. The KVM switch is coupled between the at least one host computer and the at least one controlled computer. The KVM switch includes a storage unit, and the mouse cursor display method comprises the following steps: (a) receiving the mouse status information transmitted by the host computer and temporarily storing the mouse status information in the storage unit mouse event queue (b) The mouse event queue converts the mouse status information to the mouse-specific area-specific instructions; (c) refers to the mouse status-related specific area command and prioritizes the specifics in the controlled computer screen of the controlled computer; The area is coded to generate the mouse cursor encoding data, wherein the specific area is related to the mouse cursor; (d) the mouse cursor encoding data is transmitted to the main control computer; (e) the main control computer updates the main data according to the mouse cursor encoding data. Control the main computer screen displayed by the computer.

Another embodiment in accordance with the present invention is a remote control system. In this embodiment, the remote control system includes at least one main control computer, at least one controlled computer, and a multi-computer switch. The KVM switch is coupled between the at least one host computer and the at least one controlled computer. The KVM switch includes a storage unit, a coding unit, and a communication unit. The storage unit contains a list of mouse events. The mouse event queue is used to temporarily store the mouse status information transmitted by the host computer. The mouse event queues and changes the mouse status information to the mouse-related specific area command. The coding unit is electrically coupled to the mouse event queue in the storage unit for referring to the specific state command related to the mouse state and preferentially encoding a specific area in the controlled computer screen of the controlled computer to generate the mouse cursor encoded data. . The specific area is related to the mouse cursor. The communication unit is electrically coupled to the processing unit, the encoded data buffer and the encoding unit in the storage unit, and is configured to transmit the mouse cursor encoded data to the main control computer via the encoded data buffer, the processing unit and the communication unit in the storage unit. The main control computer updates the main control computer screen displayed by the main control computer according to the mouse cursor coding data.

A specific embodiment of the present invention is a KVM switch. In this embodiment, the KVM switch is coupled between the at least one main control computer and the at least one controlled computer, and the KVM switch includes a mouse event queue, a coding unit, and a communication unit. The mouse event queue is used to temporarily store the mouse status information transmitted by the host computer and convert the mouse status information into a mouse-related specific area command. The coding unit is electrically coupled to the mouse event queue for referring to the specific state command related to the mouse state and preferentially encoding a specific area in the controlled computer screen of the controlled computer to generate the mouse cursor encoded data. The specific area is related to the mouse cursor. The communication unit is electrically coupled to the coding unit for transmitting the mouse cursor encoded data to the main control computer, so that the main control computer updates the main control computer screen displayed by the main control computer according to the mouse cursor encoded data. The mouse state related specific area command includes a mouse cursor position and a mouse button state, and the specific area is formed according to a specific rule and a mouse cursor position, and the specific area includes a mouse cursor position and a possible mouse cursor surrounding area.

Compared with the prior art, the remote control system and multi-computer switching according to the present invention The device and mouse cursor display method can achieve the following functions: (1) effectively shorten the time from the start of the operation of the mouse on the main computer side to the mouse cursor of the controlled computer of the remote control computer screen The time required between the end of the time. (2) Increase the update frequency of the mouse cursor of the controlled computer. (3) Allows the user to operate the mouse cursor of the remotely controlled computer as sensitively as a local mouse cursor while operating the remote controlled computer through the host computer.

The advantages and spirit of the present invention will be further understood from the following detailed description of the invention.

S10~S22‧‧‧ Process steps

CS‧‧‧Remote Control System

11, 21‧‧‧ master computer

12, 22‧‧‧ controlled computer

13, 23‧‧‧Multicomputer switcher

135, 235‧‧‧ mouse output hole

N‧‧‧Network

230‧‧‧Communication unit

231‧‧‧Processing unit

232‧‧‧ storage unit

233‧‧‧ coding unit

234‧‧‧Capture unit

2300‧‧‧Internet communication interface

2320‧‧‧Mouse event queue

2322‧‧‧ Capture picture buffer

2324‧‧‧Coded data buffer

T0~tn‧‧‧Time

Te‧‧‧First time difference

Tn‧‧‧Second time difference

F1~fn‧‧‧ screen update

(X1, Y1)~(Xn,Yn)‧‧‧Mouse cursor position

M1~Mn‧‧‧ button status

PMI, MI‧‧‧ Mouse Status Information

VI‧‧‧Controlled computer screen

Mouse cursor displayed on the CSR1‧‧‧ controlled computer

Mouse cursor displayed on the CSR2‧‧‧ master computer

DOM‧‧‧Mouse cursor movement direction

RI‧‧‧Mouse Status Related Specific Area Instructions

RIR‧‧ specific area

Figure 1A is a schematic diagram showing a prior art remote control system.

Figure 1B is a functional block diagram of the multi-computer switcher in Figure 1A.

1C and 1D illustrate the disadvantages of the prior art cursor having a delayed display and a low update frequency, wherein the 1Cth image shows the mouse cursor displayed on the host computer, and the 1D image shows the controlled computer. The mouse cursor displayed.

2A-1 is a functional block diagram of a KVM switch in accordance with an embodiment of the present invention.

2A-2 is a functional block diagram of a KVM switch in accordance with another embodiment of the present invention.

2B and 2C are diagrams showing that the cursor in the present invention effectively improves the disadvantages of the prior art having a low delay display and a low update frequency, wherein FIG. 2B shows the mouse cursor displayed on the main control computer, and FIG. 2C shows The mouse cursor displayed on the controlled computer.

Figure 3A shows the entire screen displayed by the controlled computer from the controlled computer screen captured by the retrieval unit.

Figure 3B shows that the controlled computer screen captured by the capture unit from the controlled computer is only a specific area related to the mouse cursor in the screen displayed by the controlled computer.

4A to 4C are diagrams showing a specific area that may appear as a mouse cursor with a valid mouse cursor priority area group according to a specific rule.

Figure 5 is a flow chart showing a method of displaying a mouse cursor in another embodiment of the present invention.

A preferred embodiment of the present invention is a KVM switch. Please refer to FIG. 2A-1. FIG. 2A-1 is a detailed functional block diagram of the KVM switch in this embodiment. As shown in FIG. 2A-1, the KVM switch 23 includes a communication unit 230, a processing unit 231, a storage unit 232, an encoding unit 233, and a capture unit 234. The communication unit 230 is electrically coupled between the network N and the processing unit 231. The processing unit 231 is electrically coupled between the communication unit 230 and the storage unit 232. The storage unit 232 is electrically coupled to the processing unit 231, the encoding unit 233, and the capturing unit 234, respectively. The capturing unit 234 is electrically coupled to the at least one controlled computer 22 . In practice, the processing unit 231 can be a central processing unit or a microprocessor, and the processing unit 231 can control the communication unit 230, the storage unit 232, and the encoding unit 233, but not limited thereto.

The communication unit 230 includes a network communication interface 2300. The network communication interface 2300 communicates with at least one host computer 21 via the network N. The storage unit 232 includes a mouse event queue 2320, a capture screen buffer 2322, and an encoded data buffer 2324. The storage unit 232 can be a memory or a solid state hard disk, but is not limited thereto. The mouse event queue 2320 is electrically coupled to the processing unit 231, the encoding unit 233, and the capturing unit 234, respectively. The capture picture buffer 2322 is electrically coupled to the coding unit 233 and the capture unit 234, respectively. The coded data buffer 2324 is electrically coupled between the processing unit 231 and the encoding unit 233.

When the main control computer 21 transmits its mouse status information MI to the KVM switch 23 via the network N, the communication unit 230 of the KVM switch 23 receives the mouse status information MI through the network communication interface 2300. The mouse status information MI transmitted by the main control computer 21 may include a mouse cursor position and a mouse button status. For example, the mouse status information MI may include: the mouse cursor position is on the coordinate (X=50, Y=25) and the left button of the mouse is in the pressed state (M=1), but not The example is limited.

On the one hand, the processing unit 231 transmits the mouse status information MI directly to the controlled computer 22 through the mouse output hole 235 on the KVM switch 23. Then, after the processing unit 231 temporarily stores the mouse status information MI sent by the main control computer 21 in the mouse event queue 2320, the mouse event queue 2320 converts the mouse status information MI into a mouse status-related specific The regional command RI is transmitted to the capture unit 234, and the capture unit 234 refers to the mouse state. The fixed area command RI retrieves the controlled computer screen VI of the controlled computer 22 from the controlled computer 22. Among them, the mouse event queue 2320 is a FIFO column with a finite length. In fact, the mouse event queue 2320 can be a memory storage queue, but not limited thereto. Assuming that the mouse event queue 2320 has a length L, a new set of mouse status information transmitted by the host computer 21 is placed in the head end of the mouse event queue 2320, and simultaneously at the mouse event. The tail end of the queue 2320 removes a set of old mouse state information so that the length of the mouse event queue 2320 can be maintained at L.

The difference between the 2A-2 and 2A-1 is that the mouse event queue 2320 described in FIG. 2A-2 is independently disposed outside the storage unit 232, that is, the storage unit 232 only includes the captured image. Buffer 2322 and coded data buffer 2324. The storage unit 232 can be a memory or a solid state hard disk, but is not limited thereto. The mouse event queue 2320 is electrically coupled to the processing unit 231, the encoding unit 233, and the capturing unit 234, respectively. The capture picture buffer 2322 is electrically coupled to the coding unit 233 and the capture unit 234, respectively. The coded data buffer 2324 is electrically coupled between the processing unit 231 and the encoding unit 233.

Since the KVM switch 23 can effectively shorten the time from the start of the operation of the mouse on the main control computer 21 to the time end of the mouse cursor of the remote control computer 22 of the main control computer 21 screen. It takes time, so the update frequency of the mouse cursor of the controlled computer 22 can be increased. Assuming that the movement direction DOM of the mouse cursor is moving to the right, the user can operate the remote control computer 22 through the main control computer 21 as if the mouse cursor of the main control computer 21 is operated (such as the hollow slide of FIG. 2C). The mouse cursor CSR2 is shown to move the mouse cursor of the remotely controlled computer 22 as shown (as shown in the hollow mouse cursor CSR1 of Fig. 2B) to the right.

It should be noted that the controlled computer screen VI captured by the capture unit 234 from the controlled computer 22 may be the entire screen displayed by the controlled computer 22 (as shown in FIG. 3A) or the controlled computer 22 at the same time. The specific area RIR associated with the mouse cursor in the displayed screen (as shown in FIG. 3B) depends on the hardware capabilities of the capture unit 234 in the KVM switch 23. For example, depending on the hardware design of the capture unit 234, the entire screen displayed by the controlled computer 22 or/and the area within a certain range of the mouse coordinates can be processed. Since the area within a certain range around the mouse coordinates is an area where the mouse cursor may appear, the specific area RIR associated with the mouse cursor in the screen displayed by the controlled computer 22 may include the mouse cursor position and its surroundings. Slip The mouse cursor may appear in the area.

In fact, the specific area RIR is formed according to the mouse cursor position and a specific rule, and the range may vary depending on the state of the system and the mouse button, and the user may also set in advance. For example, a specific rule may refer to a circular area formed by a mouse cursor position (for example, a coordinate (X=50, Y=25)) as a specific area where a mouse cursor may appear, but not Limited.

In addition, the specific rule may also refer to a valid cursor priority region set combined with a mouse position of an effective mouse event as a specific occurrence of the mouse cursor. region. As shown in FIGS. 4A to 4C, since any of the mouse status information (X1, Y1), M1 is transmitted to the controlled computer 22 at time t0 until the controlled computer 22 updates its output screen at time t1. The mouse cursor is displayed on the coordinates (X1, Y1) and the button state is M1, there is a first time difference Te, and the output screen is updated by the controlled computer 22 and the mouse cursor is displayed in the next event (X0, Y0). There is a second time difference Tn until the coordinates of M0. Therefore, the mouse cursor track stored in the mouse event string 2320 should have a length sufficient for (X1, Y1), and M1 can remain in the mouse event queue 2320 for the second time difference Tn, that is, at least All mouse events transmitted to the controlled computer 22 between the second time differences Tn. At the same time, because the mouse event received by the controlled computer 22 in the first time difference Te has not been updated to the screen, the mouse event corresponding to the first time difference Te can be omitted when the effective mouse event is selected. Therefore, for a group of mouse events (X1, Y1), M1~(Xn, Yn), Mn, (Xn, Yn), Mn is first delivered to the controlled computer 22 (X1, Y1), and M1 is finally delivered to the controlled computer 22 And falling within the first time difference Te, a valid mouse cursor priority region group formed by combining the mouse cursor positions (X2, Y2) ~ (Xn, Yn) of the effective mouse event, as shown in FIG. 4C The position of the cursor cursor circled by the thick frame is shown.

Then, the captured picture buffer 2322 of the storage unit 232 temporarily stores the controlled computer screen VI captured by the capturing unit 234 for the encoding unit 233 to perform subsequent encoding. When the encoding unit 233 receives the controlled computer screen VI from the captured picture buffer 2322 and receives the mouse state related specific area command RI from the mouse event queue 2320, the encoding unit 233 will refer to the mouse state related specific area instruction. The RI prioritizes encoding the particular area of the controlled computer screen VI of the controlled computer 22 to generate the mouse cursor encoded material.

When the encoding unit 233 generates the mouse cursor encoded data and transmits it to the encoding When the data buffer 2324 is present, the mouse cursor encoded data will be temporarily stored in the encoded data buffer 2324. Then, the processing unit 231 transmits the mouse cursor encoded data to the communication unit 230, and the network communication interface 2300 of the communication unit 230 transmits the mouse cursor encoded data to the host computer 21 through the network N. When the main control computer 21 receives the mouse cursor encoded data, the main control computer 21 updates the main control computer screen displayed by the main control computer 21 according to the mouse cursor encoded data to display the updated mouse cursor position.

It should be noted that the mouse cursor cursor screen of the present invention has a higher priority of transmission than the normal screen, and its transmission can be actively pushed by the KVM switch 23. In the actual application, when the main control computer 21 updates the main control computer screen displayed by the main control computer 21 according to the mouse cursor encoding data, the mouse cursor screen may be located on the same layer as the general screen or the mouse cursor screen may be respectively displayed. It is located on two different layers above and below the general screen.

For example, if the upper layer is a mouse cursor screen, for example, it is directly transmitted from the mouse event queue 2320 to the screen formed by the mouse state related specific region command RI (not necessarily via the controlled computer 22) of the encoding unit 233, and The lower layer is a general screen. For example, the controlled computer 22 is received by the processing unit 231 in the KVM switch 23 through the mouse output hole 235 on the KVM switch 23, and then the controlled computer is used. 22 The controlled computer screen VI directly transmitted to the capturing unit 234: the non-transparent area of the upper screen covers the lower layer screen, and the main control computer 21 directly draws the updated mouse cursor data to the upper layer, and empties the old mouse cursor. The area in the data that does not intersect with the new mouse cursor data. In this way, there will be no two mouse cursors appearing in the screen of the host computer 21.

If the mouse cursor screen is on the same layer as the normal screen: (1) When the mouse cursor cursor data updated by the master computer 21 is recorded, the area of the mouse screen is recorded, and the mouse image position is avoided when the next update is performed; When the main control computer 21 updates the mouse cursor data, the KVM switch 23 grabs the area of the mouse screen, so when the KVM switch 23 encodes and transmits the new mouse cursor data, the slide can be omitted. The area where the mouse cursor is located.

Another embodiment of the present invention is a mouse cursor display method. In this embodiment, the mouse cursor display method is applied to a KVM switch. The KVM switch is coupled between the at least one host computer and the at least one controlled computer. The KVM switch contains a storage unit. Please refer to FIG. 5 , which is a diagram showing a method for displaying a mouse cursor of this embodiment. flow chart.

As shown in FIG. 5, first, in step S10, the method receives the mouse status information transmitted by the host computer and temporarily stores the mouse status information in the mouse event queue of the storage unit. In fact, the mouse status information can include the mouse cursor position and the mouse button status. The method can receive the mouse status information transmitted by the host computer through the network or the transmission line, but not limited thereto.

In step S11, the mouse event queue converts the mouse status information into a mouse status related specific area command (RI). In step S12, the method refers to the mouse state related specific area command (RI) to retrieve the controlled computer screen of the controlled computer. The controlled computer screen is the entire screen displayed by the controlled computer or only the specific area related to the mouse cursor. In fact, a particular area can be formed according to a particular rule and mouse cursor position. The specific area contains the mouse cursor position and the area around which the mouse cursor may appear. In step S14, the method temporarily stores the controlled computer screen captured in step S12.

In step S16, the method refers to a mouse state related specific area command (RI) and preferentially encodes a specific area in the controlled computer screen of the controlled computer to generate a mouse cursor encoded data, wherein the specific area is related to the mouse Cursor related. In step S18, the method temporarily stores the mouse cursor encoded data generated in step S16.

In step S20, the method transmits the mouse cursor encoded data to the host computer. In step S22, the main control computer updates the main control computer screen displayed by the main control computer according to the mouse cursor coding data.

Compared with the prior art, the remote control system, the multi-computer switcher and the mouse cursor display method according to the present invention can achieve the following effects: (1) effectively shortening the user's operation of the mouse on the main control computer until the main control computer The time required for the screen to update the mouse cursor of the remote controlled computer. (2) Increase the update frequency of the mouse cursor of the controlled computer. (3) Allows the user to operate the mouse cursor of the remotely controlled computer as sensitively as a local mouse cursor while operating the remote controlled computer through the host computer.

The features and spirit of the present invention will be more apparent from the detailed description of the preferred embodiments. Instead, its purpose is to cover all kinds of changes and equal The nature of the invention is within the scope of the patent scope of the invention as claimed.

CS‧‧‧Remote Control System

21‧‧‧Master computer

22‧‧‧Controlled computer

23‧‧‧Multicomputer Switcher

MI‧‧‧Mouse Status Information

N‧‧‧Network

VI‧‧‧Controlled computer screen

230‧‧‧Communication unit

231‧‧‧Processing unit

232‧‧‧ storage unit

233‧‧‧ coding unit

234‧‧‧Capture unit

235‧‧‧Smooth output hole

2300‧‧‧Internet communication interface

2320‧‧‧Mouse event queue

2322‧‧‧ Capture picture buffer

2324‧‧‧Coded data buffer

RI‧‧‧Mouse Status Related Specific Area Instructions

Claims (13)

A KVM switch is coupled between at least one main control computer and at least one controlled computer. The KVM switch includes: a storage unit, including a mouse event queue, the mouse event queue is used to Temporarily storing one of the mouse status information transmitted by the master computer, the mouse event queues and converting the mouse status information into a mouse-related specific area command; a coding unit electrically coupled to the storage a unit for referring to the mouse state related specific area instruction and preferentially encoding a specific area in the controlled computer screen of one of the controlled computers to generate a mouse cursor encoded data, wherein the specific area is related to a slide And the communication unit is electrically coupled to the coding unit for transmitting the mouse cursor coded data to the main control computer, so that the main control computer updates the main control according to the mouse cursor coded data. One of the main control computer screens displayed by the computer; wherein the mouse state related specific area command includes a mouse cursor position and a mouse button state, and the specific area is based on the mouse cursor position a specific rule is formed as a circular area formed by the mouse cursor position as a center of the mouse cursor, or the specific rule is a valid mouse event A valid mouse cursor priority area group combined with the mouse cursor position is used as the specific area in which the mouse cursor may appear. The KVM switch of claim 1, further comprising: a capture unit electrically coupled to the controlled computer for referring to the specific state command related to the mouse state to retrieve the controlled computer The controlled computer screen; wherein the controlled computer screen is the entire screen displayed by the controlled computer or only the specific area related to the mouse cursor. The KVM switch of claim 1, wherein the communication unit comprises a network communication interface, and the network communication interface communicates with the host computer through a network. The KVM switch of claim 2, wherein the storage unit further comprises: a capture picture buffer electrically coupled between the capture unit and the coding unit for temporarily storing the The controlled computer screen captured by the capture unit is encoded by the coding unit. The KVM switch of claim 1, wherein the storage unit further comprises: an encoded data buffer electrically coupled between the encoding unit and the communication unit for temporarily storing the coding unit The mouse cursor encoded data generated and transmitted to the encoded data buffer, the mouse cursor encoded data being sent to the host computer via the communication unit. A mouse cursor display method is applied to a KVM switch, the KVM switch is coupled between at least one main control computer and at least one controlled computer, the KVM switch includes a storage unit, the mouse The cursor display method comprises the following steps: (a) receiving a mouse status information transmitted by the host computer and temporarily storing the mouse status information in a mouse event queue of the storage unit; (b) the sliding The mouse event queue converts the mouse status information into a mouse status related specific area command; (c) refers to the mouse status related specific area command and prioritizes one of the controlled computer screens of one of the controlled computers The region is encoded to generate a mouse cursor encoded material, wherein the particular region is associated with a mouse cursor; (d) transmitting the mouse cursor encoded data to the main control computer; and (e) updating, by the main control computer, one of the main control computer screens displayed by the main control computer according to the mouse cursor encoded data; wherein the sliding The mouse state related specific area command includes a mouse cursor position and a mouse button state, and the specific area is formed according to the mouse cursor position and a specific rule formed by the mouse cursor position as a center a circular area range as the specific area where the mouse cursor may appear, or the specific rule is a valid mouse cursor priority area group combined with the mouse cursor position of a valid mouse event as the slip This particular area of the mouse cursor may appear. The method for displaying a mouse cursor as described in claim 6 further comprises the following steps before the step (c): (b-1) referring to the mouse status information to retrieve the controlled computer screen of the controlled computer The controlled computer screen is the entire screen displayed by the controlled computer or only the specific area related to the mouse cursor. The method for displaying a mouse cursor according to claim 6, wherein the step (a) receives the mouse status information transmitted by the host computer through a network or a transmission line. The method for displaying a mouse cursor according to claim 6, wherein the step (d) transmits the mouse cursor encoded data to the host computer through a network or a transmission line. The method for displaying a mouse cursor as described in claim 7 further includes the following steps between step (b-1) and step (c): (b-2) temporary storage step (b-1) Take the controlled computer screen for step (c) code. The mouse cursor display method as described in claim 6 further includes the following steps between step (c) and step (d): (c-1) temporarily storing the mouse generated in the step (c) The cursor encodes data for the step (d) to transmit the mouse cursor encoded data to the host computer. A remote control system includes: at least one main control computer; at least one controlled computer; and a KVM switch coupled between the at least one main control computer and the at least one controlled computer, the multi-computer switch The device comprises: a storage unit, comprising a mouse event queue, the mouse event queue is used to temporarily store one of the mouse status information transmitted by the host computer, the mouse event queues and the mouse The status information is converted into a mouse-related specific area command; a coding unit is electrically coupled to the storage unit for referring to the mouse-related specific area command and prioritizing the controlled computer screen of one of the controlled computers One of the specific areas is encoded to generate a mouse cursor encoded data, wherein the specific area is associated with a mouse cursor; and a communication unit is electrically coupled to the coding unit for transmitting the mouse cursor encoded data Up to the master computer, wherein the master computer updates one of the master computer screens displayed by the master computer according to the mouse cursor code data; wherein the mouse state related specific area command includes Mouse cursor position and a state of the mouse button, the specific area based on the mouse-based position and a specific rule is formed, the particular rule to the mouse cursor position as a center is formed a circular area range as the specific area where the mouse cursor may appear, or the specific rule is a valid mouse cursor priority area group combined with the mouse cursor position of a valid mouse event as the slip This particular area of the mouse cursor may appear. A KVM switch is coupled between at least one main control computer and at least one controlled computer, the KVM switch includes: a mouse event queue for temporarily storing one of the transmitted by the main control computer The mouse status information is converted into a mouse-related specific area command; a coding unit is electrically coupled to the mouse event queue for referring to the mouse-related specific area command and prioritizing One of the controlled computers is encoded in a specific area of the computer screen to generate a mouse cursor encoded data, wherein the specific area is associated with a mouse cursor; and a communication unit electrically coupled to the coding unit And transmitting the mouse cursor coded data to the main control computer, so that the main control computer updates one of the main control computer screens displayed by the main control computer according to the mouse cursor coded data; wherein the mouse state is related The specific area command includes a mouse cursor position and a mouse button state, and the specific area is formed according to the mouse cursor position and a specific rule, the specific rule is the mouse cursor position A circular area formed by the center of the circle as the specific area where the mouse cursor may appear, or the specific rule is a valid mouse cursor priority area combined by the mouse cursor position of a valid mouse event The group is the specific area that may appear as the mouse cursor.