JPH04191914A - Battery driven computer - Google Patents

Abstract

PURPOSE:To surely notify the user of running out of a battery remaining amount by changing the display attribute of a cursor when the running out of the battery remaining amount is detected. CONSTITUTION:A battery remaining amount running out detecting means BC monitors battery voltage normally or periodically and transmits a voltage lowering (remaining amount running out) interrupting signal to a central processing unit CPU when a battery voltage is less than a reference value. Then, the attribute changing means of a cursor is started by interruption from the battery remaining amount running out detecting means BC, the display attribute of the cursor is changed by the processing and battery remaining amount running out is notified to a user. Thus, even when an operator concentrates on work, the battery remaining amount running out can be notified to the operator surely.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to battery-powered data processing devices such as personal computers and word processors that can operate on battery power.

[Prior Art] In recent years, portable data processing devices such as laptop personal computers have become popular. In such data processing equipment, operating power can be supplied by a rechargeable battery, and in order to prevent data loss or destruction due to a voltage drop in the battery, it is possible to detect when the battery is running low. It is necessary to warn the operator.

As a conventional technology regarding a warning of low battery power, for example, Japanese Patent Application Laid-Open No. 61-286885 discloses a document creation device that displays a specific display pattern at a specific position on a guide display section to display the battery consumption state. Disclosed.

Furthermore, Japanese Patent Application Laid-Open No. 64-66580 describes a battery rotation type electronic device that notifies the operator that the battery voltage has fallen below a certain level by sounding a buzzer and displaying a warning message. .

Japanese Unexamined Patent Application Publication No. 1-113681 discloses that in a hand-held terminal device, an angle line is displayed in a specific line on a small display screen, and the length of the line is reduced as the battery wears down. A degradation display method is disclosed. In a similar terminal device, a display method that notifies the operator that the battery voltage has decreased to a predetermined value by displaying an inverted display on the display screen is disclosed in Japanese Patent Laid-Open No. 1-1.1.36.
It is disclosed in Publication No. 82.

In addition, there is also a known method of notifying the operator that the remaining battery power is low by blinking a specific lamp.

[Problems to be Solved by the Invention] The conventional technology has the following problems regarding the warning of the battery being exhausted.
There is still room for further consideration in terms of ensuring that users are informed.

That is, when a specific lamp flashes or a pattern is displayed at a specific location, an operator who is concentrating on his/her work may miss the warning. Also.

In the method of notifying the user by emitting a warning sound, there is a possibility that the warning sound cannot be heard in an environment where the surrounding noise is loud.

In particular, processing is hindered when attempting to continue processing to a certain point even after a warning has been issued.

JP-A No. 1-113681 and JP-A No. 113-113
The unlined display or inverted display that spans one line on the display screen, as described in both publications of No. 682, may interfere with normal data processing, and can only be used for special purposes. Additionally, in devices with relatively large screen display devices such as personal computers and word processors, it is possible to use these techniques for one specific line (for example, the bottom line), but if you are concentrating on your work, you may miss it. This is the same as the prior art mentioned above.

The present invention provides a data processing device, a cursor display method thereof, and a warning message display that can reliably notify an operator of a low battery level even when the operator is concentrating on work or in a noisy environment. The purpose is to provide a method.

[Means for Solving the Problems] In order to achieve the above object, a data processing device according to the present invention includes a display means for displaying a cursor on a display screen of the data processing device in a data processing device that is powered by a battery. and a detecting means for detecting a depletion of the remaining battery power, and a display attribute changing means for changing the display attribute of the cursor when the depletion of the battery residual power is detected by the detecting means.

The display attributes of the cursor include, for example, shape, color, gradation,
This is at least one of the presence or absence of blinking and the cycle of blinking.

Another data processing apparatus according to the present invention is a data processing apparatus driven by a battery, and includes a display means for displaying a cursor on a display screen of the data processing apparatus, a detection means for detecting battery exhaustion, and the detection means. The device is equipped with means for displaying a warning message near the current cursor position when the remaining battery power is detected to be low.

This data processing device includes means for saving display information at a position on the display screen where a warning message is displayed, and means for redisplaying the saved display information at the original position when the remaining battery level is restored. Further provision may be made.

The detection means is not particularly limited in the present invention, but for example, the battery voltage may be compared with a predetermined reference value to detect whether the battery is depleted.

According to other researchers, the data processing device according to the invention includes:
In a data processing device driven by a battery, a central processing unit that controls the entire data processing device, a battery that supplies operating power for the data processing device, and a display unit that displays a cursor that indicates an input position on a display screen. and,
Monitor the remaining power of the battery.

The central processing unit comprises: a remaining battery power detecting means that interrupts the central processing unit when the remaining battery power is detected to be exhausted; and a storage means storing a program for changing display attributes of the cursor; A program for changing the display attributes of the cursor is executed in response to the interruption due to the battery being exhausted.

In this data processing device, preferably, the storage means also stores a second program for restoring the display attribute of the cursor to its original state, and the detection means detects that the remaining battery level has been recovered. The central processing unit also has a function of interrupting the central processing unit to restore the remaining battery power, and the central processing unit executes the second program in response to the interruption to restore the remaining battery power.

Further, the storage means preferably stores the program in a system area.

The device may further include means for prohibiting the change of the cursor display attribute until the remaining battery power is recovered after the cursor display attribute is changed due to the interruption due to the battery power being exhausted.

Depending on whether the current cursor whose display attributes are to be changed is an insert mode cursor, two different display attributes can be prepared as the changed display attributes. The user may further include means for the user to register display attributes of the cursor based on the content.

A cursor display method according to the present invention is a cursor display method for a battery-powered data processing device, in which a specific display attribute is determined in advance as a display attribute of a cursor to be displayed when the remaining battery power is exhausted. During operation, the remaining battery capacity is monitored, and when the remaining battery capacity is detected, the display attribute of the cursor is changed to the specific display attribute.

In this cursor display method, preferably, after the cursor attribute is changed to the specific display attribute, changing of the cursor display attribute is prohibited until the remaining battery power is recovered.

A warning message display method according to the present invention is a warning message display method for a battery-powered data processing device, comprising:
A message to be displayed when the battery runs out is determined in advance, and when the battery is in operation due to a suspicious battery, the remaining battery power is monitored, and when the remaining battery power is detected, a warning message is displayed near the cursor position at that time. It was designed so that

In this warning message display method, preferably, it is determined whether or not there is a sufficient area for displaying a warning message in the area on one end of the cursor within the line where the current cursor is located, and if there is an area on the side of the movement direction. If it is not available, it will be displayed in the area on the other end of the cursor.

In addition, when a warning message is displayed, the display data of the position where the warning message is displayed is saved, and when the remaining battery power is recovered, if the displayed warning message remains on the display screen, the warning message will be displayed. The original display data may be displayed instead.

[Operation] A user working on a data processing device generally pays attention to a cursor that indicates an input position on the screen.

Therefore, by changing the display attributes of the cursor (for example, cursor shape) from the normal state, or by displaying a warning message near the cursor position, it is possible to attract the user's attention and reliably notify the user that the battery is running low. .

Specifically, the battery remaining power detection means constantly or periodically monitors the battery voltage, and if the battery voltage falls below a reference value, it sends a voltage drop (remaining power out) to the central processing unit. ) sends an interrupt signal. Further, when the battery voltage is recovered by charging or replacing the battery, a voltage recovery (remaining capacity recovery) interrupt signal is sent to the central processing unit.

The cursor attribute changing means or the warning message displaying means is activated by an interrupt from the above-mentioned battery exhaustion detection means, and changes the cursor display attribute by one process or warns the user near the cursor position. Display a message to inform the user that the battery is low.

Furthermore, when a battery voltage recovery interrupt occurs, the cursor shape is restored or the message displayed near the cursor position is restored to return to its original state.

Note that various software runs on the data processing device, so programs for changing the cursor shape and displaying messages near the cursor position are built into the data processing device itself (that is, stored in the system area of memory). Programs running on the computer may not require any changes.

(Hereinafter, blank space) [Example] Hereinafter, examples of the present invention will be described in detail with reference to a field.

FIG. 1 is a block diagram showing the overall configuration of a computer device as an example of a data processing device to which the present invention is applied.

In the figure, KB is a keyboard for inputting data and giving processing instructions to the computer, and is provided with various keys necessary for making various inputs and instructions. R.O.
M mainly stores system programs, including service routines for operating various hardware. RAM stores application programs and data, and is also used as a work area for system programs.
U) is a processing unit that reads out the application program stored in the program storage unit or data storage unit and executes the program based on various instructions from the keyboard KB. The DSP is a display unit and displays the execution status of the program. BT is a battery and supplies power to the computer. This is a battery remaining power detection circuit, which in this embodiment constantly monitors the battery voltage and generates a voltage drop interrupt to the CPU when the battery voltage falls below a certain level. In addition, if the battery voltage returns to normal after the battery voltage has dropped by -degrees, such as by replacing the battery,
This time for the CPU.

Generates a voltage recovery interrupt. Note that the constant monitoring of the battery voltage may be periodic monitoring at fixed time intervals.

To change the display attributes of the cursor, change the shape of the cursor. There are various methods such as changing the color (including gradation) of the cursor, changing the blinking status or period of the cursor, etc., but in this embodiment, a method of changing the shape of the cursor is adopted. A second method of displaying a warning message near the cursor using the cursor position will be described later.

FIG. 2(a) shows an example of the shape of the warning cursor.

This warning cursor is displayed instead of the normal cursor when the battery is exhausted, as shown in Figure 3.
Warn the user that the battery is low. The shape of this warning cursor is registered in the warning cursor shape memory buffer CCBUF shown in FIG. 12, which will be described later. If you prepare a utility program that stores the cursor shape in this warning cursor shape memory buffer CCBUF,
User registration of warning cursor shape is now possible. for example,
As shown in FIG. 2(b), any shape such as a battery symbol can be registered.

In addition to the normal cursor shown in FIG. 3, as shown in FIG. 4, a cursor for insertion mode, which inserts data between input data, may be provided. When the cursor is normally displayed, as mentioned above, the registered warning cursor is displayed as is, but when the cursor is displayed in insert mode, it is 1, and when the battery is low, the difference between the two modes is to be able to distinguish. In this example.

The registered warning cursor is displayed in reverse as shown in FIG. Of course, a separate warning cursor may be provided instead of being inverted.

Next, a processing program for a voltage drop interrupt and a voltage recovery interrupt generated from the remaining battery power depletion detection circuit shown in FIG. 1 to the CPU will be described.

7 to 9 are flowcharts of a processing program for changing the cursor shape. The work area required at this time is shown in FIG.

In executing the processing programs shown in FIGS. 7 to 9,
Various storage units are set in the data storage unit RAM. 12th
The figure is a memory configuration diagram showing each of these storage units. C.C.F.
is a cursor shape change prohibition flag, which is referenced in the cursor shape setting process shown in FIG. 8 prepared in the system program. This flag is used to invalidate an attempt by an application program to change the cursor shape while the warning cursor is being displayed. Without such a flag, if the application program changes the cursor shape while the warning cursor is displayed, the warning cursor will disappear. For this reason, a cursor shape change prohibition flag was provided. The initial state of this flag is ○, which means that the cursor shape can be changed. CCBtIF is a warning cursor shape memory buffer that stores the shape of the warning cursor as a bit image. CDBIJF is a buffer for displaying a warning cursor. In the case of a cursor during insertion mode, the warning cursor is displayed in reverse, but this warning cursor display buffer is also used when performing the reverse operation of the warning cursor. C3BUF is.

This is a cursor shape save area. Before displaying the warning cursor, the current cursor shape is stored in this cursor shape save area, and is used to restore the cursor shape when the battery voltage is restored.

Hereinafter, a method of issuing a warning that the battery level is low by referring to these storage areas and changing the cursor shape will be described.

FIG. 7 shows a flowchart of voltage drop interrupt processing. This is a process that is executed by interrupting the process currently being executed when the remaining battery power detection circuit shown in FIG. 1 generates an interrupt for CPt when the battery voltage falls below a certain level.

First, in step 10, the current cursor shape is stored under the cursor shape save area C3BIj in order to restore the cursor shape to its original shape when the voltage is restored. Step 2
0, the read current cursor shape is inspected and it is determined that the current cursor shape is a normal cursor but is a cursor in insert mode. If the current cursor shape is a normal cursor, the process moves to step 3o, and if the current cursor shape is an insert mode cursor, the process moves to step 4o. Step 3o is for a normal cursor, in which case the contents of the warning cursor shape memory buffer CCBUF are transferred as they are to the warning cursor display buffer. Step 4o is for the case of the cursor in the insert mode, and in this case, the contents of the warning cursor shape memory buffer CCBUF are inverted and transferred to the warning cursor display buffer. next step 50
is a warning cursor display process, which calls the cursor shape setting process 5ETCUR shown in FIG. 8 using the start address of the warning cursor display buffer as a parameter.

Finally, in step 60, the cursor shape change prohibition flag is set to 1 to prohibit the application program from changing the cursor shape. Thereafter, the processing of the program whose processing was interrupted due to the occurrence of the voltage drop interrupt is resumed.

FIG. 8 shows details of the cursor shape setting process 5ETCUR, which is carried out in step 50 of FIG. Step 8
1 is a process for determining a cursor shape change prohibition flag.

If this flag is 1, it means that F cursor shape change is prohibited, and the process ends without doing anything. If this flag is O, it means that the cursor shape can be changed, and the process moves to step 82.

Step 82 is a cursor shape display process, in which it is assumed that the cursor shape is stored as a bit image with the given buffer address as the starting address, and a cursor shape according to the data is displayed.

FIG. 9 is a flowchart of voltage recovery interrupt processing. This is the process currently being executed when the battery exhaustion detection circuit shown in Figure 1 detects a drop in battery voltage, and then the battery voltage recovers by replacing the battery and generates an interrupt to the CPU. This is a process that is executed by interrupting the Step 91 is a process for permitting a change in the cursor shape, and sets the cursor shape change prohibition flag to 0. Step 92 is a process for returning the cursor shape to the cursor shape that was displayed before the warning cursor was displayed. As such, the cursor shape setting process 5ETC11R of FIG. 8 is called. Thereafter, the program processing that was interrupted due to the occurrence of the voltage recovery interrupt is resumed.

As is clear from the above description, according to this embodiment, by changing the shape of the cursor, it is possible to reliably notify the user that the remaining battery power is exhausted.

Next, FIGS. 5 and 6 show an embodiment in which a warning message is displayed near the current cursor position.

Here, as an example, the size of the display screen is assumed to be 25 lines in the vertical direction and 80 columns in the horizontal direction, as shown in FIG. To display warning messages and simplify the screen recovery process.

If there is an area to the right of the current cursor position where all warning messages can be displayed, the warning messages are displayed from the right of the cursor position on the same line as the current cursor position, as shown in FIG. Also, if there is not enough space to display the warning message to the right of the current cursor position, the 6th
Display a warning message to the left of the cursor position on the same line as the current cursor position, as shown in the figure. The contents of the warning message are stored in the warning message storage buffer shown in Figure 13.

The length of the warning message is stored in the warning message length field. If a utility is created to register a warning message in the same way as the warning cursor, the user can register any warning message.

Next, the procedure for displaying a warning message near the cursor position will be explained. 10 and 11 are flowcharts of a processing program for displaying a warning message near the cursor position. In executing these processing programs, various storage sections are set in the data storage section RAM. FIG. 13 is a memory configuration diagram showing each of these storage units, and each of these storage units will be explained below. C
ON○ is for storing the current column position of the cursor, and LINO is for storing the current cursor line position. SCO is for storing the message display start column position, and SLI is for storing the message display start line position. SCO and SLI are used to recover 5-screen information when voltage is restored. CCOλO is a column position work area used to recover screen information when voltage is restored, and CLINO is a row position work area used for the same purpose. MLEN indicates the character length of the warning message. MBUF is a buffer that stores the contents of the warning message.

5BUF is a buffer for saving screen information written at the position where the warning message is displayed. This is necessary when the voltage is restored and the screen information is restored to its original state.

Hereinafter, with reference to these, the procedure for displaying a message indicating that the remaining battery level is low near the cursor position will be explained.

FIG. 10 shows a flowchart of voltage drop interrupt processing. This is a process that is executed by interrupting the process currently being executed when the remaining battery power detection circuit shown in FIG. 1 generates an interrupt to the CPU when the battery voltage falls below a certain level.

Step 101 is a process of reading the current cursor position, and the read cursor position is stored in column No.
Stored in C0N0 and row No. LIN○. Step 10
2 is a process that checks whether there is enough space to display a warning message to the right of the current cursor position, and if the sum of the current column position and warning message length is greater than 79, the current It is determined that there is not enough area to display the warning message on the right side of the column position, and the process moves to step 104. Otherwise, it is determined that there is sufficient area to display the warning message to the right of the current cursor position, and the process moves to step 103. In step 103, the message display start column SCO is set to the column number CON◯, which is the column position of the current cursor, plus 1 as a warning message to be displayed on the right side of the current cursor position.

Further, the line number and LINO, which is the current line position of the cursor, is set in the message display start line SLI. In step 104, a message display start column SC is selected to display a warning message to the left of the current cursor.
Column No. C, which is the column position of the current cursor, in O
Set the value of ON○ minus the warning message length MLEN. Further, in the message display start line SLI, the line number, LIN○, which is the current line position of the cursor, is set. Step 105 is a process in which the screen information of the area where the message is displayed is saved in order to be restored when the voltage is restored.The screen information of only the long warning message is saved on the screen from the message display start column and message display start line. Save to information save buffer 5BUF. Step 106 is a warning message display process, in which a warning message is read from the message display start column and message display start line from the warning message storage buffer MBUF and displayed on the screen.

Thereafter, the program processing that was interrupted due to the occurrence of the voltage drop interrupt is resumed.

FIG. 11 is a flowchart of voltage recovery interrupt processing. This detects a low battery voltage due to the low battery level circuit shown in Figure 1, and when the battery voltage recovers by replacing the battery and an interrupt is generated to the CPU, the process currently being executed is interrupted. This is the process that is executed.

Step 111 is initial processing, in which message display start column SCO is compared with column No., CCO\゛0,
Compare message display start line SLI with line No, CL
Set each to INO. Step 112 is the end determination of the screen information recovery process, and if the comparison column No, CC0N0 is larger than the message display start column SLO plus the warning message length MLEN, the screen information recovery has ended. Then, this process is terminated and the process interrupted by the voltage recovery interrupt is resumed.

Otherwise, proceed to step 113, step 1
13 is a process for determining whether or not to restore the screen information before displaying the warning message, which was saved in advance in step 105 of FIG. 10. Comparison column! The screen information written in the position indicated by <o, comparison line No. is read out, and it is determined whether it is the warning message portion at the position written in the voltage drop interrupt processing. If it is not a warning message or sausage part, it is determined that the warning message was written by the voltage drop interrupt and then overwritten by the application program, and the screen position is saved and processed to be written back to the screen information. Try not to do it. In this case, the process jumps to step 115. If the read screen information is a warning message part, the process moves to step 114.

Step 114 is a drawing information recovery process, and the 10th
The screen information saved in step 105 of the figure is read from the relevant position of the screen information saver sofa 5BUF, and the comparison column No.

CC0NO2 comparison line No, write back to CLTNO. Step 115 includes comparison columns N o , CC0N
This is an increment process of 0, and the comparison column N o ,
Add 1 to CC0N0 and return to step 112.

As is clear from the above description, according to this embodiment, since a warning message is displayed near the cursor position that the user is watching, it is possible to reliably notify the user that the battery is running low. In addition, since the warning message is displayed in the same line regardless of the cursor position, the warning message does not span two lines and degrade visibility. Even if the cursor is at the bottom line, the display of the warning message will not cause the screen to scroll to the next line. Therefore, it is possible to avoid a situation where such screen scrolling interferes with the display state of the application program.

In addition, in the above embodiment, everything is realized on the system side so that the present invention can be implemented without changing the existing application program, but the same processing as in this embodiment can also be implemented by incorporating it into the application program. be able to.

[Effects of the Invention] According to the present invention, by taking advantage of the fact that people are paying attention to the cursor on the screen while working, if the remaining battery power is exhausted, the display attributes of the cursor can be changed or the cursor can be Since the user is warned by displaying a message near the location, the user can be reliably informed that the battery is running low.

[Brief explanation of the drawing]

Fig. 1 is a system configuration diagram of the present invention, Fig. 2 is an explanatory diagram of the warning cursor shape, Fig. 3 is an explanatory diagram of the warning cursor shape when using a normal cursor, and Fig. 4 is an explanatory diagram of the warning cursor shape when the cursor is in insert mode. Figure 5 is an explanatory diagram of the screen when a warning message is displayed on the right side of the cursor, Figure 6 is an explanatory diagram of the screen when a warning message is displayed on the left side of the cursor, and Figure 7 is an explanatory diagram of the cursor shape. Figure 8 is a flowchart of voltage drop interrupt processing when changing the cursor shape, Figure 9 is a flowchart of voltage drop recovery interrupt processing when changing the cursor shape, and Figure 10 is when displaying a warning message. 11 is a flowchart of voltage recovery interrupt processing when displaying a warning message, FIG. 12 is an internal configuration diagram of the memory when changing the cursor shape, and FIG. 13 is a flowchart of voltage recovery interrupt processing when displaying a warning message. FIG. 3 is an internal configuration diagram of a memory when displaying. CPU/processing section, DSP...display section, KB...keyboard, ROM/program storage section, RAM...data storage section, BT...battery, BC...battery exhaustion detection circuit.

Claims (1)

[Scope of Claims] 1. In a data processing device driven by a battery, a display means for displaying a cursor on a display screen of the data processing device, a detection means for detecting battery exhaustion, and a battery power supply by the detection means. When the remaining amount is detected,
A battery-powered data processing device comprising display attribute changing means for changing a display attribute of the cursor. 2. The battery-powered data processing device according to claim 1, wherein the display attribute of the cursor is at least one of shape, color, gradation, blinking, and blinking cycle. 3. In a data processing device driven by a battery, a display means for displaying a cursor on a display screen of the data processing device, a detection means for detecting a depletion of battery power, and a detection means for detecting a depletion of battery power by the detection means. When
A battery-powered data processing device comprising means for displaying a warning message near the current cursor position. 4. Means for evacuating the display information at the position on the display screen where the warning message is displayed, and means for redisplaying the evacuated display information at the original position when the remaining battery power is restored. The battery-powered data processing device according to claim 3, characterized in that: 5. The battery-powered data processing device according to claim 1, wherein the detecting means detects the battery remaining power by comparing the battery voltage with a predetermined reference value. 6. In a data processing device driven by a battery, a central processing unit that controls the entire data processing device; a battery that supplies operating power for the data processing device; and a display device that displays a cursor that indicates an input position on a display screen. a remaining battery amount detection means for monitoring the remaining amount of the battery and interrupting the central processing unit when the remaining battery amount is detected to be exhausted; and a storage means storing a program for changing the display attribute of the cursor. A battery-powered data processing device, characterized in that the central processing unit executes a program for changing display attributes of the cursor in response to an interruption of the battery being exhausted. 7. The storage means also stores a second program for restoring the display attribute of the cursor to its original state, and the detection means detects that the remaining battery level has been recovered and sends the battery to the central processing unit. 7. The battery according to claim 6, further comprising a function of generating an interrupt for restoring battery power, and wherein the central processing unit executes the second program in response to the interrupt for restoring battery power. Drive type data processing device. 8. The battery-powered data processing device according to claim 6 or 7, wherein the storage means stores the program in a system area. 9. The computer according to claim 6, further comprising means for prohibiting a change in the cursor display attribute until the remaining battery level is recovered after the cursor display attribute is changed due to the interruption due to the battery remaining capacity being exhausted. Battery-powered data processing device. 10. According to claim 6, two different display attributes are prepared as display attributes after the change, depending on whether the current cursor whose display attribute is to be changed is an insert mode cursor or not. battery-powered data processing equipment. 11. The battery-powered data processing device according to claim 6, further comprising means for a user to register a cursor display attribute caused by an interruption due to the battery being exhausted. 12. A cursor display method for a battery-powered data processing device, wherein a specific display attribute is determined in advance as the display attribute of the cursor to be displayed when the remaining battery power is exhausted, and the remaining battery power is displayed when operating on a battery. 1. A cursor display method, characterized in that battery power is monitored, and when battery power is detected to be low, a display attribute of the cursor is changed to the specific display attribute. 13. The cursor display method according to claim 12, wherein after the cursor attribute is changed to the specific display attribute, changing of the cursor display attribute is prohibited until the remaining battery power is recovered. 14. A warning message display method for a battery-powered data processing device, which predetermines a message to be displayed when the battery runs out, monitors the remaining battery level during battery-powered operation, and detects when the battery runs out. A warning message display method characterized in that when a warning message is detected, a warning message is displayed near the current cursor position. 15. In the line where the current cursor is located, determine whether there is enough area to display a warning message in the area on one end of the cursor, and if so, display it in the area on the moving direction side, and if not, close the cursor. 15. The warning message display method according to claim 14, wherein the warning message is displayed in an area on the other end side. 16. When a warning message is displayed, save the display data of the position where the warning message is displayed, and when the remaining battery power is restored, if the displayed warning message remains on the display screen, the warning message will be saved. 15. The warning message display method according to claim 14, further comprising displaying original display data instead of.