TW201423588A - Input device for magnifying display screen and method thereof - Google Patents

Abstract

A method for using an input device magnifying a display screen is suitable for magnification on the display screen of a computer apparatus. The input device receives an informed instruction of the computer apparatus, wherein the informed instruction indicates whether an operating system of the computer apparatus provides a screen magnifier program. When the operating system supports the screen magnifier program, the input device according to the press of a function key outputs a first magnifying instruction to the computer apparatus. The computer apparatus according to the first magnifying instruction starts the screen magnifier program for operating system and the display screen zooms. When the operating system does not support the screen magnifier program, the input device according to the press of the function key outputs a second magnifying instruction for providing by the input device to the computer apparatus. The computer apparatus according to the second instruction lets the display screen zoom.

Description

Input device and method for performing display screen enlargement thereof

The present invention is an input device, and more particularly to an input device for a computer device and a method for performing display image enlargement thereof.

The information products are currently developing in a multi-functional, exquisite and small direction, wherein the display screen of the information product is usually set in a higher resolution display mode in order to display a more detailed and beautiful picture. The display on the screen and the font size become smaller. In this way, it is inconvenient to observe the display screen for the visual acuity such as myopia, presbyopia or amblyopia, or the use of the group, such as the screen display and the font display. The picture. However, the operating system of some existing information products has been provided with a system magnifying glass function, which can enlarge the user's view of the display screen.

The present invention provides an input device and a method of performing display image enlargement thereof to solve the above problems.

The present invention provides a method for performing display screen enlargement by an input device, which is suitable for amplifying a display screen of a computer device, comprising: receiving, by the input device, a notification command of the computer device, wherein the command is instructed to indicate whether an operating system of the computer device is Providing a system magnifying glass; when the operating system supports the use of the system magnifying glass, the input device outputs a first amplifying command to the computer device according to the pressing of a function key, so that the computer device starts the operating system according to the first amplifying command The system magnifier is supplied and the display is enlarged. When the operating system does not support the use of the system magnifier, the input device outputs a second amplification command provided by the input device to the computer device according to the pressing of the function key, wherein the second enlargement command is to activate a software magnifying glass to enlarge the display screen.

In an embodiment of the invention, the computer device further includes an application software, the application software has a software magnifying glass, and the application software obtains a version information of the operating system, and generates a notification command including version information.

The invention provides a method for performing display screen enlargement by an input device, which is suitable for a method for amplifying a display screen of a computer device, comprising: receiving, by the input device, a notification command of the computer device, wherein the notification command is an operating system for indicating the computer device Whether a system magnifying glass is provided; when the operating system supports the use of the system magnifying glass, the input device outputs a first amplifying command or a second amplifying command to the computer device according to the pressing of a function key and a set value, wherein the setting value is setting Using the first enlargement instruction or the second enlargement instruction to perform display screen enlargement; when the operating system does not support using the system magnifier, the input device outputs a second enlargement instruction to the computer device according to the pressing of the function key; wherein the first enlargement instruction is The system magnifier provided by the operating system is activated to enlarge the display screen, and the second enlargement command is to activate a software magnifying glass to enlarge the display screen.

The invention provides a method for performing display screen enlargement by using an input device, which is suitable for amplifying a display screen of a computer device, comprising: receiving a computer device output according to a connection interface when a connection interface of the input device is connected with the computer device a transmission signal determines whether an operating system of the computer device provides a system magnifying glass; when the operating system supports the use of the system magnifying glass, the input device outputs a first amplification command to the computer device according to pressing of a function key, so that the computer device is First amplifying the command and starting the system magnifying glass provided by the operating system and Amplifying the display screen; and when the operating system does not support the use of the system magnifying glass, the input device outputs a second amplification instruction provided by the input device to the computer device according to the pressing of the function key, wherein the second amplification instruction is to start a soft magnifying glass Zoom in on the display screen.

In an embodiment of the invention, the input device further includes an application firmware, the application firmware has a soft magnifying glass, and the application firmware obtains a version information of the operating system according to the transmission signal, and the application firmware determines the computer according to the version information. Whether the operating system of the device provides a system magnifier.

The invention provides an input device capable of providing display screen enlargement, which is suitable for amplifying a display screen of a computer device, comprising: a control unit, an input operation unit and a connection interface. The input operation unit is coupled to the control unit and has a function key. The connection interface is coupled to the control unit. The control unit determines whether a working system of the computer device provides a system magnifier when the connection interface is connected to the computer device; when the operating system supports the use of the system magnifier, the input device outputs a first amplification command to the computer device according to the pressing of the function button. So that the computer device activates the system magnifying glass provided by the operating system according to the first magnifying instruction and amplifies the display screen; when the operating system does not support the use of the system magnifying glass, the input device outputs the input device according to the pressing of the function key. The second enlargement command is sent to the computer device to cause the computer device to enlarge the display screen according to the second enlargement command.

The specific means of the present invention is to receive an instruction command or a transmission signal of the computer device by using the input device, wherein the instruction command or the transmission signal is to indicate whether the operating system of the computer device provides a system magnifying glass, whereby the input device outputs the first according to the pressing of the function key. Or the second amplifying command is sent to the computer device, so that the computer device enlarges the display screen according to the first or second amplifying command, and the above mechanism can improve the cross-platform operation of the input device and enlarge the display screen. The convenience is to effectively solve the problem that the input device performs the display screen enlargement under different operating systems.

The detailed description of the present invention and the accompanying drawings are to be understood by the claims The scope is subject to any restrictions.

In order to fully understand the present invention, the embodiments are described in detail below with reference to the accompanying drawings, and are not intended to limit the present invention.

(First Embodiment)

1 is a flow chart of a method for an input device to perform display screen enlargement according to an embodiment of the present invention. Please refer to Figure 1. A method for performing display screen enlargement by an input device is suitable for amplifying a display screen of a computer device, comprising the following steps: First, in step S101, the input device receives a notification instruction of the computer device. In practice, the input device is, for example, a mouse, a keyboard or a computer tablet. This embodiment does not limit the aspect of the input device. The peripheral device, such as a computer device and an input device, is transmitted through a Human Interface Device Class (HID Class) specification, for example, so that the computer device can recognize the functions and identities of peripheral products such as input devices. Of course, the computer device can also customize its own instructions to notify the peripheral device such as the input device, and enable the peripheral device such as the input device to obtain a notification instruction of whether the computer device provides the system magnifying glass.

In detail, the computer device installs an application software, and the application software has There is a software magnifying glass, and the application software obtains a version information of the computer device operating system, and generates a notification command according to the manual interface device category specification. In addition, the software magnifying glass of the application software has the same function as the system magnifying glass of the operating system, and the display screen can be enlarged, and will not be described here.

Next, in step S103, the instruction is instructed to indicate whether the operating system provides a system magnifier. In practice, when the connection interface of the input device is connected to the computer device, the input device receives an instruction command from the computer device, wherein the instruction command is to indicate whether the operating system of the computer device provides a system magnifier. For example, if the operating system is a Windows Vista version or a newer version of Microsoft, the operating system already has the system magnifying glass, and the operating system is, for example, a Windows XP version of Microsoft or earlier, and the operating system does not have the system magnifying glass.

It can be seen from this that the input device obtains information on whether the computer device provides the system magnifier according to the notification command. When the instruction instruction indicates that the operating system provides the system magnifying glass, the steps S105 and S107 are performed, and the input device transmits the first amplification instruction to the computer device; when the notification instruction indicates that the operating system does not provide the system magnifying glass, step S109 and step S111 are performed. In the program, the input device transmits a second amplification command to the computer device.

The input device of the present invention can perform the function of displaying the image enlargement by using the step of transmitting the first or second enlargement command to enable the input device of the present invention to be on the version of the different operating system or different operating system, wherein the application software transmits The instruction notification input device is configured to determine that the input device transmits the first or second amplification command to the computer device.

When the application software determines to cause the input device to transmit the first amplification command to the computer device, that is, "the determination result in step S103 is YES" In the program, the step is executed, step S105, the input device outputs a first amplification command to the computer device according to the pressing of a function key. In practice, when the operating system supports the use of the system magnifier, the input device outputs a first amplification command to the computer device according to the pressing of a function key, so that the computer device activates the system magnifying glass provided by the operating system according to the first amplification instruction. Zoom in on the display.

In detail, the input device outputs a first amplification command to the computer device, and the operating system of the computer device receives the first amplification command to activate the system magnifier provided by the operating system. In addition, in other embodiments, when the operating system supports the use of the system magnifying glass, the application software can further use a set value to set the execution screen to enlarge using a system magnifying glass or a soft magnifying glass. When the operating system supports the use of the system magnifying glass, the input device is based on the input device. Pressing the function key and setting the application software, and outputting the first enlargement command or the second enlargement command to the computer device, wherein the set value is setting to use the first enlargement command or the second enlargement command to perform display screen enlargement, thereby The user can selectively activate the system magnifier or the soft magnifying glass through the set value, and enlarge the display screen.

In this embodiment, the setting value of the application software is prioritized to start the system magnifying glass of the operating system. In other embodiments, the setting value of the application software may be set to preferentially start the software magnifying glass or the setting value of the application software. The system magnifier or the soft magnifying glass is set according to the user's habit or demand, and the embodiment does not limit the aspect of the set value of the application software.

It is worth mentioning that the first zoom instruction is a shortcut key signal of the operating system. In practice, the first zoom instruction is a set of shortcut key signals. For example, the first zoom instruction may include a shortcut key signal for starting the system magnifier, a time delay signal, and a shortcut key signal for adjusting the system magnifier. start up The shortcut key signal of the system magnifier can be, for example, "win key and +", and the shortcut key signal of the system magnifying glass can be, for example, "win key and L". Therefore, in step S107, the computer device activates the system magnifier of the operating system according to the first enlargement command, and can adjust whether the enlarged screen is a full screen or a non-full screen.

In other embodiments, the first zooming instruction may also be a sequence of signals for starting a system magnifying glass and adjusting the magnification of the system magnifying glass, for example, the first zoom instruction is a "win key and +" shortcut key signal, a time delay signal, and Adjusting the shortcut key signal of the "win key and +" of the magnification, thereby achieving the effect of starting the system magnifier and adjusting the magnification, and the embodiment does not limit the aspect of the first enlargement instruction.

When the application software determines that the input device transmits the second amplification command to the computer device, that is, in the program of "NO in step S103", step S109 is performed, and the input device outputs a second amplification according to pressing of a function button. Command to the computer device. In practice, when the operating system does not support the use of the system magnifying glass, the input device outputs a second amplification command provided by the input device to the computer device according to the pressing of the function key, so that the computer device performs the display screen according to the second amplification instruction. amplification.

In detail, the input device outputs a second amplification command to the computer device, the application software receives the second amplification command, and the application software launches the software magnifying glass. In practice, the second zooming instruction may be, for example, a shortcut key signal of the application software. For example, the second zoom instruction is a button signal of a mouse or a manufacturer command (Vender Command) conforming to the USB HID (Human Interface Device) specification, and the button signal of the mouse may be a fourth button signal, a fifth button signal or a sixth Button signal, thereby outputting the second amplification instruction to the application software, so that the application software starts when receiving the second amplification instruction The software magnifying glass, therefore, in step S111, the computer device enlarges the display screen according to the software magnifying glass activated by the application software executing the second enlargement instruction, and the embodiment does not limit the aspect of the second enlargement command.

It should be noted that the input device of the embodiment performs the method for zooming in the display screen, and the application device is installed by the computer device, and the application software obtains the version information of the computer device, and generates a notification command according to the manual interface device type (HID) specification. The input device, whereby the input device outputs a first or second amplification command to the computer device according to pressing a function key, whereby the input device achieves the effect of amplifying the display screen across different operating systems.

(Second embodiment)

2 is a flow chart of a method for an input device to perform a display screen enlargement according to another embodiment of the present invention. Please refer to Figure 2. A method for performing display screen enlargement by an input device is suitable for amplifying a display screen of a computer device, comprising the following steps: First, in step S201, a connection interface of the input device is connected to the computer device. In practice, the connection interface is, for example, a universal serial bus (USB), a mini universal serial bus (Mini USB), or a micro universal serial bus (Micro USB). This embodiment does not limit the aspect of the connection interface. The type of device described in the description information of the input device (OS DESCRIPTORS), that is, the HID Class, for example: 03h, the Vendor ID applied to the USB Association, for example: 046D, and the manufacturer A product ID, such as C517, or even a Version Number, which identifies the function and identity of the input device in order for the computer device to find an input device connection. .

Next, in step S203, the input device determines whether a system of the computer device provides a system magnifier according to the transmission signal. In practice, the input device determines whether the operating system of the computer device provides a system magnifier according to the transmission signal output by the computer device received by the connection interface. When the input device is connected to the computer device through the connection interface, the input device can also determine the version information of the computer device.

It is assumed that the version of the input device is applicable to the Microsoft Windows Vista version of the computer device. When the input device is connected to the computer device, and the computer device supports the version of the input device, the description information of the input device (OS DESCRIPTORS) requires a reply. Valid OS_STRING information, such as a Microsoft Windows Vista version or a newer version of the computer device, will provide valid OS_STRING information to the input device; and when the computer device does not support the input device version, the input device description information (OS DESCRIPTORS) The information of the OS_STRING that is required to be replied will be omitted by the computer device and the registration value (Registry), such as the Microsoft Windows XP version or earlier version of the computer device, will use the registration value, so that the input device can judge The computer device is a version above windows vista or a version before windows xp. This embodiment does not limit the connection between the connection interface of the input device and the computer device.

In detail, the input device further includes an application firmware, and the application firmware obtains a version information of the operating system according to the transmission signal, and the application firmware determines whether the operating system of the computer device provides the system magnifying glass according to the version information.

It is worth mentioning that when two operating systems, such as Apple or Microsoft, detect the connection of peripheral products such as input devices, the two operating systems will be different. The detection method, for example, the input device is connected to the Apple operating system through the connection interface, and the Apple operating system detects only the mouse and does not detect the keyboard. When the input device is connected to the Microsoft operating system through the connection interface, the Microsoft operating system detects the mouse and then detects the keyboard. In this way, the input device is connected to the Apple or Microsoft operating system through the connection interface, and the input device determines the connection between the Apple or Microsoft operating system according to the detection methods of the Apple and Microsoft operating systems.

The input device obtains information on whether the computer device provides the software magnifier according to the transmission signal. When the transmission signal indicates that the operating system provides the software magnifying glass, the steps S205 and S207 are performed, and the input device transmits the first amplification instruction to the computer device; when the transmission signal indicates that the operating system does not provide the software magnifying glass, step S209 and step S211 are performed. In the program, the input device transmits a second amplification command to the computer device.

The input device of the present invention can perform the function of zooming in on the display screen by using the step program for transmitting the first or second enlargement command to enable the input device of the present invention to be on a different operating system or a version of a different operating system, wherein the input device is The application firmware receives the transmission signal to determine whether the input device transmits the first or second amplification command to the computer device.

Next, when the operating system supports the use of the system magnifier, the application firmware determines to cause the input device to transmit the first enlargement command to the computer device, that is, when the determination result in step S203 is YES, in step S205, the input device is configured according to Pressing a function key to output a first amplification command to the computer device. In step S207, the computer device activates the system magnifier provided by the operating system according to the first enlargement command and amplifies the display screen.

Application when the firmware determination operating system supports the use of the system magnifier The firmware transmits the first amplification instruction to the computer device through the manual interface device category specification, and the first amplification instruction is the shortcut key signal of the operating system. The first amplifying command of this embodiment is the same as the first amplifying command of the first embodiment, and therefore will not be further described herein.

In addition, when the operating system does not support the use of the system magnifying glass, the application firmware determines to cause the input device to transmit the second amplification command to the computer device, that is, when the determination result in step S203 is NO, step S209 is performed, and the input device is configured according to Pressing a function key to output a second amplification command to the computer device. In step S211, the computer device enlarges the display screen according to the second enlargement command.

In detail, when the application firmware determination operating system does not support the use of the system magnifying glass, the input device outputs a second amplification instruction to the computer device according to the pressing of the function key, wherein the computer device includes an application software, and the application software has a soft magnifying glass. . When the application software receives the second enlargement instruction, the application software starts the software magnifying glass. The second zoom instruction is a mouse button signal or a manufacturer command (Vender Command). The second enlargement command of this embodiment is the same as the second enlargement command of the first embodiment, and therefore will not be further described herein. In addition, the software magnifying glass has the same function as the system magnifying glass of the operating system, and the display screen can be enlarged, which will not be repeated here.

(Third embodiment)

FIG. 3 is a functional block diagram of an input device capable of providing display screen enlargement according to another embodiment of the present invention. Please refer to Figure 3. An input device 1 for providing display screen enlargement, suitable for amplifying a display screen of a computer device 9, comprising a control unit 10, an input operation unit 12 and a connection Interface 14.

The control unit 10 is coupled between the input operation unit 12 and the connection interface 14 . In practice, the control unit 10 is, for example, a central processing unit (CPU) or a microprocessor (MCU) or the like for performing signal calculation and processing in the input device 1. The control unit 10 determines whether a working system of the computer device 9 provides a system magnifying glass when the connection interface 14 is connected to the computer device 9. This embodiment does not limit the aspect of the control unit 10.

The connection interface 14 is coupled to the control unit 10. In practice, the connection interface 14 can be a universal serial bus (USB), a mini universal serial bus (Mini USB), or a micro universal serial bus (Micro USB). Of course, those of ordinary skill in the art can arbitrarily choose the type of connection interface 14.

The input operation unit 12 is coupled to the control unit 10 and has a function key 120. In practice, the input operation unit 12 is, for example, a left mouse button, a right mouse button, a mouse wheel, a mouse displacement sensor, or a keyboard button. Of course, when the input operation unit 12 is pressed, scrolled or moved, a corresponding input operation signal will be generated and transmitted to the control unit 10. Those skilled in the art should know the function of the input operation unit 12, and therefore will not be described herein.

When the operating system supports the use of the system magnifying glass, the input device 1 outputs a first amplification command to the computer device 9 according to the pressing of the function key 120, so that the computer device 9 activates the system magnifying glass provided by the operating system according to the first amplification instruction and The display is enlarged. When the operating system does not support the use of the system magnifying glass, the input device 1 outputs a second amplification command provided by the input device 1 to the computer device 9 according to the pressing of the function key 120, so that the computer device 9 displays the second amplification command according to the second amplification command. The picture is enlarged.

For example, the mouse has a function key 120. When the user needs to activate the display screen to zoom in, when the user presses the function key 120, the mouse will generate the first The first or second enlargement command is sent to the computer device 9, whereby the display screen is enlarged; when the user needs to close the display screen to zoom in, when the user presses the function button 120 again, the mouse generates a close command to the computer device 9, thereby Restore the display of the original operating system.

In other embodiments, the user can also press the function key 120 multiple times to achieve the function of cyclically starting, adjusting, and closing the system magnifier. For example, when the function key 120 is pressed for the first time, the mouse will generate the first or The second enlargement command is sent to the computer device 9, whereby the display screen is enlarged; when the function key 120 is pressed for the second time, the display screen is subjected to magnification adjustment, for example, three, four, five or multiple times; when the function key 120 When pressed three times, it will return to the display screen of the original operating system. Of course, the function key 120 can also be set to have the function after being pressed for a period of time. This embodiment does not limit the implementation of the function key 120.

In summary, the specific means of the present invention is to receive an instruction command or a transmission signal of a computer device by using an input device, wherein the instruction command or the transmission signal is a system loupe indicating whether the operating system of the computer device provides a system magnifier, thereby inputting the device according to the function key. Pressing to output the first or second amplification command to the computer device, so that the computer device enlarges the display image according to the first or second amplification command, and the above mechanism can improve the cross-platform operation of the input device and make the display screen The convenience of enlargement is to effectively solve the problem that the input device performs display screen enlargement under different operating systems.

The specific embodiments of the present invention are intended to be illustrative only and not to limit the invention to the above embodiments, without departing from the spirit of the invention and the following claims. The scope of the invention and the various changes made are within the scope of the invention. Therefore, the scope of protection of the present invention is defined by the scope of the appended patent application. Prevail.

1‧‧‧Input device

9‧‧‧Computer equipment

10‧‧‧Control unit

12‧‧‧Input operation unit

120‧‧‧ function keys

14‧‧‧Connection interface

S101~S111‧‧‧ steps of the embodiment of the present invention

S201~S211‧‧‧ steps of the embodiment of the present invention

1 is a flow chart of a method for an input device to perform display screen enlargement according to an embodiment of the present invention.

2 is a flow chart of a method for an input device to perform a display screen enlargement according to another embodiment of the present invention.

FIG. 3 is a functional block diagram of an input device capable of providing display screen enlargement according to another embodiment of the present invention.

S201~S211‧‧‧ steps of the embodiment of the present invention

Claims (17)

A method for performing display screen enlargement by an input device, which is suitable for amplifying a display screen of a computer device, comprising: the input device receiving a notification command of the computer device, wherein the notification command is an operation system indicating the computer device Whether a system magnifying glass is provided; when the operating system supports the use of the system magnifying glass, the input device outputs a first amplifying command to the computer device according to pressing of a function key, so that the computer device according to the first amplifying instruction Activating the system magnifying glass provided by the operating system and amplifying the display screen; and when the operating system does not support the use of the system magnifying glass, the input device outputs a second provided by the input device according to the pressing of the function key Amplifying the command to the computer device, wherein the second zooming instruction is to activate a software magnifying glass to enlarge the display image. The method of claim 1, wherein the computer device further comprises an application software, the application software has the software magnifying glass, and the application software obtains a version information of the operating system and generates information including the version information. The notification instruction. The method of claim 2, wherein the input device outputs the second amplification command to the computer device, the application software receives the second amplification command, and the application software activates the software magnifying glass. The method of claim 1, wherein the first enlarged instruction is a set of shortcut key signals. The method of claim 1, wherein the first enlargement The command is a shortcut key signal that includes a shortcut key signal for starting the system magnifier, a time delay signal, and an adjustment system magnifier. The method of claim 1, wherein the second amplifying instruction is a mouse button signal or a manufacturer command (Vender Command). A method for performing display screen enlargement by an input device, which is suitable for amplifying a display screen of a computer device, comprising: the input device receiving a notification command of the computer device, wherein the notification command is a command indicating the computer device Whether the operating system provides a system magnifying glass; when the operating system supports the use of the system magnifying glass, the input device outputs a first amplifying command or a second amplifying command to the computer device according to a pressing of a function key and a set value The setting value is set to use the first amplifying instruction or the second amplifying instruction to perform display screen enlargement; when the operating system does not support using the system magnifying glass, the input device outputs the button according to the pressing of the function key a second amplifying instruction to the computer device; wherein the first amplifying command is to activate the system magnifying glass provided by the operating system to enlarge the display screen, and the second amplifying command is to activate a software magnifying glass to perform the display image amplification. The method of claim 7, wherein the first enlarged instruction is a set of shortcut key signals. The method of claim 7, wherein the first zooming instruction is a shortcut key signal including a shortcut key signal for starting the system magnifier, a time delay signal, and a system magnifying lens. The method of claim 7, wherein the second amplifying command is a mouse button signal or a manufacturer command (Vender Command). The method of claim 7, wherein the computer device further comprises an application software, the application software has the software magnifying glass and the set value, and the application software obtains a version information of the operating system, and generates the inclusion The notification instruction for this version of the information. A method for performing display screen enlargement by an input device, which is suitable for amplifying a display screen of a computer device, comprising: receiving a computer device according to the connection interface when a connection interface of the input device is connected to the computer device Outputting a transmission signal determines whether an operating system of the computer device provides a system magnifying glass; when the operating system supports the use of the system magnifying glass, the input device outputs a first amplification command to the computer device according to pressing of a function key So that the computer device activates the system magnifying glass provided by the operating system according to the first magnifying instruction and enlarges the display screen; and when the operating system does not support the use of the system magnifying glass, the input device according to the function Pressing the key to output a second amplifying command provided by the input device to the computer device, wherein the second amplifying command is to activate a software magnifying glass to enlarge the display screen. The method of claim 12, wherein the computer device further comprises an application software, the application software having the software magnifying glass, and when the application software receives the second amplification instruction, the application software starts the software magnifying glass. The method of claim 12, wherein the first enlarged instruction is a set of shortcut key signals. The method of claim 12, wherein the first enlargement command is a shortcut key signal including a shortcut key signal for starting the system magnifier, a time delay signal, and an adjustment system magnifier. The method of claim 12, wherein the second amplifying command is a mouse button signal or a manufacturer command (Vender Command). An input device capable of providing display screen enlargement, suitable for amplifying a display screen of a computer device, comprising: a control unit; an input operation unit coupled to the control unit, having a function key; and a connection interface coupled Connecting the control unit; wherein the control unit determines whether a working system of the computer device provides a system magnifying glass when the connecting device is connected to the computer device; and when the operating system supports the use of the system magnifying glass, the input device is configured according to the function Pressing the key to output a first zooming instruction to the computer device, so that the computer device activates the system magnifying glass provided by the operating system according to the first zooming instruction and enlarges the display screen; when the operating system does not Supporting the use of the system magnifier, the input device outputs a second amplification command provided by the input device to the computer device according to the pressing of the function button, so that the computer device performs the display screen according to the second amplification command. amplification.