JPH08102928A - Help screen image display device - Google Patents

Abstract

PURPOSE: To display an illustration in an easily understandable way by displaying an explanation message of a key when an explanation illustration of an operation means is displayed by the entry of a specific key and the key in a displayed illustration is entered. CONSTITUTION: When a help key is depressed, a illustration of an operation panel of a remote control transmitter is illustrated as shown in Fig. A. A help text as to a multi-key is displayed as shown in Fig. B by depressing the multi- key in operation keys on the illustration. When the local multi-key is depressed once more, a multi-screen display for program selection is executed. A microcomputer sets a state of operation keys of the remote control transmitter in each image displayed in each stage of key operation in the help image pattern. Since function allocation of the operation keys changes in each image pattern, the function share is changed for each state setting when the help image pattern is displayed in the state of each image pattern.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a help screen display device, and in particular, in a subscriber terminal device such as a video-on-demand system, it is possible to understand the explanation of the operation procedure on each screen displayed according to the stage of key operation The present invention relates to a simplified help screen display device.

[0002]

2. Description of the Related Art Cable television broadcasting facilities (hereinafter referred to as CA
A TV) is a system for distributing a television signal from a center device to subscriber terminal devices by a cable, and is expected to provide various image information services as well as multi-channel.

[0003] CATV services include broadcasting services such as retransmission and voluntary broadcasting, as well as charging for pay programs,
There are non-broadcasting services such as home shopping and home banking.

Furthermore, in recent years, a bidirectional communication function between a center device and a terminal device group in CATV is used, and a subscriber accesses a center device equipped with a video server to allow a video and audio information service via a cable. A video-on-demand system has been developed that is designed to receive the information. Thus, if the subscriber terminal requests the center device to send out the video software, the desired video software can be viewed in real time.

By the way, in the subscriber terminal device of the video-on-demand system, the function allocation of the operation keys is changed on each screen displayed according to the stage of key operation. Therefore, in order to guide the operation procedure, a help key is provided in the operation means, and an explanation message of the operation key is displayed.

However, since the explanation of the operation keys is a message explanation using characters, it is difficult to immediately understand which key on the operation panel performs what function, and when the function assignment of the operation key changes, which key is changed. There is a problem that it is valid, it is difficult to know which key is invalid, and the operability is poor.

[0007]

As described above, in the conventional help screen display device, since the explanation message of each operation key is an explanation in characters, it is difficult to understand the function of each operation key immediately. Is valid, it is difficult to understand which key is invalid, and there is a problem that operability is poor.

In view of the above problems, the present invention immediately understands the function of the operation keys, and which key is effective,
It is an object of the present invention to provide a help screen display device which is easy to understand which key is invalid and has excellent operability.

[0009]

A help screen display device according to a first aspect of the present invention includes a video generation means for generating a video signal, a display means for displaying the video signal, and various types for the video generation means. Operation means for adding the display operation of
A memory having means for displaying an operation explanatory diagram of the operation keys of the operation means on the screen of the display means by inputting a specific key of the operation keys of the operation means; And a means for displaying an explanation message of the operation key corresponding to one of the operation keys displayed in the explanatory diagram, by adding a key to the operation explanatory diagram. Characterize.

According to another aspect of the present invention, there is provided a help screen display device, a video generating means for generating a video signal, a displaying means for displaying the video signal, and an operation for applying various display operations to the video generating means. Means and each screen displayed according to the stage of key operation by the operating means,
It has means for changing the function assignment of the operation keys and a memory, and displays an operation explanatory diagram of the operation keys of the operation means on the screen of the display means by inputting a specific key among the operation keys of the operation means. And a memory, and an explanation message of the operation key is added to the operation explanatory diagram by key input of the operation means corresponding to one of the operation keys displayed in the operation explanatory diagram. And means for displaying.

In the help screen display device according to the present invention, a video generation means for generating a video signal, a display means for displaying the video signal, and an operation for applying various display operations to the video generation means. Means and each screen displayed according to the stage of key operation by the operating means,
It has means for changing the function assignment of the operation keys and a memory, and displays an operation explanatory diagram of the operation keys of the operation means on the screen of the display means by inputting a specific key among the operation keys of the operation means. And a memory, and an explanation message of the operation key is added to the operation explanatory diagram by key input of the operation means corresponding to one of the operation keys displayed in the operation explanatory diagram. And a means for causing the display to be displayed and a means for executing a process corresponding to the key by re-keying the key of the operating means having the explanation message.

According to another aspect of the present invention, there is provided a help screen display device, a video generating means for generating a video signal, a displaying means for displaying the video signal, and an operation for applying various display operations to the video generating means. Means and each screen displayed according to the stage of key operation by the operating means,
It has means for changing the function assignment of the operation keys and a memory, and displays an operation explanatory diagram of the operation keys of the operation means on the screen of the display means by inputting a specific key among the operation keys of the operation means. And a memory, and an explanation message of the operation key is added to the operation explanatory diagram by key input of the operation means corresponding to one of the operation keys displayed in the operation explanatory diagram. And a means for displaying the explanation message and a means for erasing the explanation message by inputting a key different from the key of the operation means having the explanation message.

According to another aspect of the present invention, there is provided a help screen display device, a video generation unit for generating a video signal, a display unit for displaying the video signal, and an operation for applying various display operations to the video generation unit. Means and each screen displayed according to the stage of key operation by the operating means,
It has means for changing the function assignment of the operation keys and a memory, and displays an operation explanatory diagram of the operation keys of the operation means on the screen of the display means by inputting a specific key among the operation keys of the operation means. And a memory, and an explanation message of the operation key is added to the operation explanatory diagram by key input of the operation means corresponding to one of the operation keys displayed in the operation explanatory diagram. And a key different from the key of the operation means having the explanation message and the means for executing a process corresponding to the key by re-inputting the key of the operation means having the explanation message. And means for deleting the explanation message by inputting.

According to a sixth aspect of the present invention, in the help screen display device according to any one of the second to fifth aspects, a means for changing the display state between the invalid key and the valid key in the operation explanatory diagram is provided. It is characterized by having.

According to a seventh aspect of the present invention, in the help screen display device according to the sixth aspect, the means for changing the display state changes the display color or the display brightness between the invalid key and the effective key. To do.

According to an eighth aspect of the present invention, in the help screen display device according to the sixth aspect, the means for changing the display state causes the effective key to blink.

According to a ninth aspect of the present invention, in the help screen display apparatus according to the sixth aspect, the means for changing the display state displays only the valid key without displaying the invalid key.

[0018]

According to the invention described in claim 1, an explanatory view of the operating means is displayed by a specific key input, and an explanatory message of the key is displayed by inputting a key displayed in the explanatory view. Therefore, there is an effect that the function of the operation key can be immediately understood.

According to the second aspect of the present invention, the function assignment of the operation keys is changed and set on each screen displayed according to the stage of key operation, and a specific key input is made on each displayed screen. , The explanatory diagram of the operation key for which the function is changed and set is displayed, and the explanation message of the key is displayed by the input of the key displayed in the explanatory diagram, so that the function assignment of the operation key is changed. The effect is that the function of the operation key can be immediately understood.

According to the invention of claim 3, in addition to the effect of claim 2, by re-keying the key in which the explanation message is displayed, the processing corresponding to that key can be executed, and the same It is possible to improve operability by key operation. .

According to the invention described in claim 4, the explanation message can be erased by inputting a key different from the key on which the explanation message is displayed, and the explanation message of the new key input is displayed. can do.

According to the fifth aspect of the present invention, by re-keying the key for which the explanation message is displayed, the process corresponding to the key can be executed, or a key different from the key is input. As a result, the explanation message can be erased, and a new explanation message of key input can be displayed, so that the operability can be further improved.

According to the inventions of claims 6 to 9, even if the function assignment of the operation keys is changed at each stage of the key operation, it is possible to immediately know which key is valid and which is invalid. is there.

[0024]

EXAMPLES Examples will be described with reference to the drawings. Before describing the help screen display device according to the present invention with reference to FIG. 1, a video-on-demand system to which the help screen display device according to the present invention is applied will be described with reference to FIG.

FIG. 2 is a block diagram showing a video-on-demand system to which the help screen display device according to the present invention is applied.

As shown in FIG. 2, a cable 30 connects the center device 10 having a server and the subscriber device 20 having a terminal device group. Center device 1
At 0, the server 11 stores the program video as digitized image compression data, and provides the image data based on the program request from the terminal side. A program request from the terminal side is demodulated by a modem (modulator / demodulator) 13 and supplied to the center computer device 14. The center computer device 14 retrieves the requested program from the program menu management data memory 15 based on the program request information from the modem 13, reads the corresponding video information from the server 11,
It is supplied to the modulator 12 corresponding to one channel. As the modulator 12, a plurality of modulators corresponding to the number of channels of the center device 10 are provided. Modulator 12
Is composed of a digital modulator (for example, an OFDM modulator which is a kind of multi-carrier digital modulation system using a large number of carriers). When there is a program request from a plurality of terminal devices 21, a plurality of program videos are output from the server 11, and a plurality of modulators 12 output the modulated outputs corresponding to the channels. The modulation outputs corresponding to the channels from the respective modulators 12 are combined, sent out to the cable 30, and supplied to the plurality of terminal devices 21 connected to the cable 30. The output of the terminal device 21 is the television receiver 2
2 is supplied to display the video image information. Note that the OFDM modulation / demodulation processing can be performed collectively for all carriers using discrete Fourier transform without using a plurality of modulators / demodulators.

FIG. 1 is a block diagram showing the configuration of a terminal device to which the help screen display device according to the present invention is applied.
FIG. 1 shows an example of the terminal device 21 in FIG.

In the terminal device 21 shown in FIG. 1, a digital modulation signal is input to the RF signal input terminal 211 from the center device via a cable. The image data provided from the server out of the digitally modulated signal from the input terminal 211 is selected by the tuner circuit 212 that performs channel selection corresponding to each carrier, and then demodulated by the digital demodulator (for example, OFDM demodulator) 213. Further, the decoder circuit 214 uses MPEG (Motion Picture Expert).
Group) image compressed data is decoded into an NTSC signal, passes through an image switching switch circuit 227, is further supplied to one input end of an image superimposing image synthesizing circuit 215, and is output to a television via the image synthesizing circuit 215. It is output to the terminal 222. The television output terminal 222 is connected to a television receiver or a television monitor (also referred to as a CRT display) as a means for displaying a video signal.

The tuner circuit 212 and the demodulation circuit 21
3, decoder circuit 214, multi-screen combining circuit 227
Constitutes an image generation means.

On the other hand, digital modulation data downloaded from the center device 10 (for example, menu data, program data, control data for multi-screen display, control data for displaying help screen, and illustration display when displaying help screen) The graphic data for displaying and the text data for displaying a message at the time of displaying the help screen are demodulated by the modem 217 and taken into the microcomputer 216. If the captured data is, for example, menu data, the microcomputer 2
16 is stored in the program menu memory 221. If the captured data is, for example, program data, the microcomputer 216 stores it in the program information memory 224.
If the captured data is, for example, multi-screen data, the microcomputer 216 stores it in the multi-screen information memory 226. If the captured data is, for example, help control data, the microcomputer 216
Is stored in the help information memory 225. If the data to be fetched is, for example, illustration data for displaying help, the microcomputer 216 determines that the graphic memory 22
3a. If the data to be captured is text data for displaying help, for example, the microcomputer 216 stores it in the text memory 223b. Graphic memory 223a and text memory 223b
Constitutes a help display data memory 223.

The menu data stored in the program menu memory 221 includes data such as menu numbers, menu names, title names and the like. Program information memory 22
The program data stored in 4 includes data such as program program numbers and program names. Multi-screen information memory 226
The multi-screen data stored in
It includes data such as the number of multi-screen pages and the number of screens that make up the multi-screen. In the help control data (see FIG. 7) stored in the help information memory 225, the status program number set according to the status of each screen displayed at each stage of key operation, the figure number for displaying help, Contains data such as text numbers for displaying help.
The graphic data (see FIG. 8) stored in the graphic memory 223a includes data such as a graphic number and a graphic of a remote control transmitter as an operating means. Text memory 2
The text data stored in 23b (see FIG. 9) includes
It includes data such as a text number corresponding to the state of each screen and text information for giving an explanation message for each operation key (1 to n) in this text state. Note that the data giving the explanation message is not necessarily text data and may be image data giving character information. Therefore, instead of the text memory 223b, an image memory storing character information as image data is used. It is also possible to adopt a different structure.

Since the menu data and the program data are updated each time the program content is changed, the program menu memory 22 on the terminal side is downloaded by the center side.
1 and the program information memory 224 are also rewritten. The menu data and the program data stored in the program menu memory 221 and the program information memory 224 are read out by the microcomputer 216 and supplied to the image creating circuit 218 composed of a character generator or the like. The data is temporarily stored in the image memory 219. The data in the image memory 219 is read as an analog signal, supplied to the other input end of the image synthesizing circuit 215, and output to the television output terminal 222 as character information. The image synthesizing circuit 215 synthesizes the menu information signal and the program information signal with the screen signal from the switch circuit 227 and outputs the synthesized signal.

The graphic memory 223a, the microcomputer 216, the image forming circuit 218, and the image memory 21.
9. The image synthesizing circuit 215 constitutes means for displaying an operation explanatory view of the operation keys of the remote control transmitter as the operation means. Further, the text memory 223b, the microcomputer 216, the image creating circuit 218, the image memory 219, and the image synthesizing circuit 215 add the explanation message of the operation key of the remote control transmitter as the operation means to the operation explanation diagram and display it. Constitutes a means.

On the other hand, the terminal device 21 interlocks with the center device 10 to collectively display a plurality of programs currently being broadcast on one screen (called multi-screen display), and to select a program on the display screen. have. Terminal device 2
The video information for the multi-screen sent from the center side based on the multi-screen instruction from the tuner circuit 21
2, the data is demodulated by the demodulation circuit 213, the MPEG image compressed data is further decoded by the decoder circuit 214 into an NTSC signal, and is then combined into a multi-screen by a multi-screen combining circuit 227 including a frame memory or the like. During the multi-screen display for selecting the program, the switch circuit 228 selects the output from the multi-screen composition circuit 227, and the image is output to the television output terminal 222 via the image composition circuit 215. The microcomputer 216 controls the multi-screen synthesizing circuit 227 based on the screen data for multi-screen synthesizing from the multi-screen information memory 226 to synthesize the multi-screens.

The remote control receiving circuit 220 receives a remote control signal transmitted from a remote control transmitter (not shown) as an operating means. The remote control receiving circuit 220 receives the remote control signal, decodes the remote control signal, and decodes it. It is supplied to the computer 216.

The microcomputer 216 generates the multi-screen instruction, the help screen instruction, the help text display instruction, and each screen displayed according to the key operation stage, based on the data supplied from the remote control receiving circuit 220. The state setting, program selection, and channel selection based on the program selection are controlled.

FIG. 3 shows the operation surface of the remote control transmitter.
The remote control transmitter has a power key, an end key, a time display key, a multi-screen display key, up / down and left / right four-direction selection keys for selecting items or programs on the screen, an input (execute) key, and an operation. A help key for displaying the explanation screen is provided.

In the terminal device 21, the function assignment of the remote control operation keys changes on each screen displayed according to the stage of key operation by the remote control transmitter, and the valid key and the invalid key are generated according to each operation stage. There are cases. This is caused by the microcomputer 216 setting the state of each screen displayed according to the stage of key operation.

FIG. 4 shows an example of state setting in the terminal device 21. First, the power switch is turned on (step 51), and the initial menu is displayed (step 5).
2). At this time, the state "0" is set (step 5).
3). As a result, initial function assignments are made to the remote control operation keys. Next, item selection is performed by key input (step 54). If item 1 is selected from the initial menu, menu 1 is displayed (step 55). At this time, the state "1" is set (step 56). By this, for the remote control operation key,
A second function assignment is made. After this, the program is viewed. On the other hand, when item 2 is selected from the initial menu in step 54, menu 2 is displayed (step 5
7). At this time, the state "2" is set (step 5).
8). As a result, the third key
Function allocation is done. After this, the program is viewed (step 59) and the state "3" is set (step 60). As a result, the fourth function is assigned to the remote control operation key. Next, for example, it is referred to whether or not the program fast-forward operation is in progress. That is, it is determined whether or not fast forward is in progress (step 61), and if fast forward is in progress (YE
S), the state "4" is set (step 62). As a result, the fifth function is assigned to the remote control operation keys. In step 61, if fast-forwarding is not in progress (NO), the process returns to step 60 and the state is set to "3".

FIG. 5 shows a flow chart of the help screen display of the microcomputer 216 in the terminal device 21 of FIG. FIG. 6 shows a help screen display example.

In FIG. 5, a certain screen displayed in accordance with the stage of key operation is in a waiting state for the help key input (step 71), and it is next determined whether or not the help key is pressed. (Step 72). If there is no help key input (NO), the key input waiting state is entered again. If there is a help key input (YES), the help information of the operating means corresponding to the current terminal state (that is, the screen display state) is the help information memory and the help display data memory (see FIG. 1).
(Step 73) and a help screen is displayed (step 74). The help screen displayed at this time is an illustration of the operation surface of the remote control transmitter as shown in A of FIG. 6, for example. After the help screen is displayed, the help key input waiting state is again entered (step 75), and it is determined whether the help key has been pressed (step 76).
When the help key is input (YES), the illustration help screen of the remote control transmitter is erased (step 77), the process returns to step 71, and the display screen returns to the original screen state.

When an operation key other than the help key is pressed in step 76 (NO), the help text corresponding to the input key is obtained from the text memory (see FIG. 1) (step 78) and the help text is displayed. (Step 79). At this time, for example, if the help screen shown in FIG. 6A is displayed, and if the "multi" key among the operation keys is pressed in step 76, "
The help text, which is an explanatory message of the "multi" key, is displayed as shown in Fig. 6B. If the help text is multi-key, "If you press this key again, the program currently being broadcast will be displayed. All of them are displayed on a multi-screen, and the program can be selected by selecting one screen after that. " After this help text is displayed, it waits for key input (step 80),
It is again determined whether the same key (multi-key in the example of FIG. 6) has been pressed (step 81). When the same key is input (YES), the process (multi-screen display in the example of FIG. 2) corresponding to that key is started to execute (staple 82), and at the same time, the help text is erased (step 83) and the help screen is erased. (Step 77) is performed. Step 81
Then, if a different key is input, the help text is erased (step 84) and the process returns to step 76 again.

A display example of the help screen shown in FIG. 6 will be described. When the help key is pressed while a certain screen is displayed,
6B is displayed by pressing a multi-key (for example, this key is the multi-key of the remote controller at the subscriber's hand) in the operation keys on this remote control transmitter as shown in FIG. Help text about the multi-key as shown in is displayed. Then, by pressing the multi-key at hand again, multi-screen display for program selection is executed.

In the help screen shown in FIG. 6, the operation keys of the remote control transmitter are displayed at each step of key operation, and the microcomputer 216 sets the status as shown in FIG. Since the function assignment of the operation keys changes depending on the state of each screen, when the help screen is displayed in each state of the screen (when the remote control graphic of A is displayed in the screen example of FIG. 6), each state setting is performed. , Valid key and invalid key are generated, and the distribution of valid and invalid changes. Therefore, when the help key is pressed to display a remote control graphic on the help screen, control may be performed by the microcomputer 216 so that the invalid key and the valid key in the display graphic have different display states. Specifically, the invalid key and the valid key may have different display colors or display brightness, or the valid key may be displayed in a blinking manner. Alternatively, only invalid keys may be displayed without displaying invalid keys. Further, control may be performed such that the invalid key is displayed with reduced brightness and the valid key is displayed in a blinking manner. By controlling in this way, it is possible to immediately know which key is valid and which is invalid on the help screen.

FIG. 7 shows the center device 10 to the terminal device 2
1 shows an example of help control data downloaded.

The help control data is composed of a state number, a figure number and a text number. This help control data is stored in the help information memory 225 of FIG.

FIG. 8 shows the center device 10 to the terminal device 2.
1 shows an example of help graphic data downloaded. The help graphic data is composed of a graphic number and remote control graphic data. This help graphic data is shown in Figure 1.
Stored in the graphic memory 223a.

FIG. 9 shows the center device 10 to the terminal device 2.
1 shows an example of help text data downloaded. The help text data is composed of a text number and a plurality of help text data for a plurality of operation keys on the remote control graphic. This help text data is stored in the text memory 223b of FIG.

In the above embodiments, the help control data, the help graphic data and the help text data are described as being downloaded from the center side to the terminal side memory when the power is turned on. The data may be downloaded from the center side each time depending on the displayed screen, or these data may be preloaded in the memory on the terminal side at the factory stage.

The device of the present invention can be used not only for displaying a help screen on a terminal device of a video-on-demand system, but also for displaying a help screen of a general television receiver or a computer terminal device.

[0051]

As described above, according to the present invention, an explanatory drawing of the operating means is displayed by inputting a specific key, and when a certain key in the displayed drawing is input, an explanatory message of the key is displayed. Therefore, the functions of the operation keys can be displayed in an easy-to-understand manner corresponding to the drawings. Moreover, after that, by pressing the messaged key again, the function of the key can be executed. In addition, which key is valid,
By displaying which keys are invalid,
A device having excellent operability can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a terminal device to which a help screen display device according to the present invention is applied.

FIG. 2 is a block diagram showing a video-on-demand system to which the help screen display device according to the present invention is applied.

FIG. 3 is a plan view showing an operation surface of a remote control transmitter.

FIG. 4 is a flowchart showing an example of state setting in the terminal device of FIG.

5 is a flowchart illustrating a help screen display operation in the terminal device of FIG.

6 is an explanatory diagram showing a help screen display example in FIG. 5. FIG.

7 is a diagram showing an example of help control data loaded in the memory of the terminal device of FIG. 1. FIG.

8 is a diagram showing an example of help graphic data loaded in the memory of the terminal device of FIG. 1. FIG.

9 is a diagram showing an example of help text data loaded in the memory of the terminal device of FIG. 1. FIG.

[Explanation of symbols]

 21 ... Terminal device 215 ... Image synthesizing circuit 216 ... Microcomputer 223 ... Help display data memory 223a ... Graphic memory 223b ... Text memory 225 ... Help information memory 226 ... Multi-screen information memory

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] November 15, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takuji Kimura 1-9-2 Harara-cho Fukaya-shi, Saitama Prefecture Fukaya Plant, Toshiba Corporation (72) Inventor Shoji Uehara 3-3-9 Shimbashi, Minato-ku, Tokyo No. within Toshiba A.V.E. Co., Ltd. (72) Inventor Go Tomita 3-3-9 Shimbashi, Minato-ku, Tokyo Within Toshiba A.V.E.

Claims (9)

[Claims] 1. A video generation means for generating a video signal, a display means for displaying the video signal, an operation means for applying various display operations to the video generation means, a memory, and the operation means. And a memory for displaying an operation explanatory view of the operation keys of the operation means on the screen of the display means by inputting a specific key among the operation keys of FIG. A help screen display device comprising: means for displaying an explanation message of the operation key added to the operation explanatory diagram by a key input of the operation means corresponding to one of the operation keys. 2. A video generation means for generating a video signal, a display means for displaying the video signal, an operation means for applying various display operations to the video generation means, and a step of key operation by the operation means. In each screen displayed according to the above, there is a means for changing the function assignment of the operation keys and a memory, and the operation is performed on the screen of the display means by inputting a specific key of the operation keys of the operation means. Means for displaying an operation explanatory view of the operation keys of the means, and a memory, and by operating the key input of the operation means corresponding to one of the operation keys displayed in the operation illustration, A help screen display device comprising: means for displaying an explanatory message in addition to the operation explanatory diagram. 3. A video generation means for generating a video signal, a display means for displaying the video signal, an operation means for applying various display operations to the video generation means, and a step of key operation by the operation means. In each screen displayed according to the above, there is a means for changing the function assignment of the operation keys and a memory, and the operation is performed on the screen of the display means by inputting a specific key of the operation keys of the operation means. Means for displaying an operation explanatory view of the operation keys of the means, and a memory, and by operating the key input of the operation means corresponding to one of the operation keys displayed in the operation illustration, Means for displaying an explanation message by adding it to the operation explanation diagram, and performing a process corresponding to the key by re-keying the key of the operation means having the explanation message Help screen display device being characterized in that and means for. 4. A video generation means for generating a video signal, a display means for displaying the video signal, an operation means for applying various display operations to the video generation means, and a step of key operation by the operation means. In each screen displayed according to the above, there is a means for changing the function assignment of the operation keys and a memory, and the operation is performed on the screen of the display means by inputting a specific key of the operation keys of the operation means. Means for displaying an operation explanatory view of the operation keys of the means, and a memory, and by operating the key input of the operation means corresponding to one of the operation keys displayed in the operation illustration, By inputting a means for displaying an explanation message by adding it to the operation explanation drawing and a key different from the key of the operation means having this explanation message, the explanation message is displayed. Help screen display device being characterized in that and means for causing removed by. 5. A video generation means for generating a video signal, a display means for displaying the video signal, an operation means for applying various display operations to the video generation means, and a step of key operation by the operation means. In each screen displayed according to the above, there is a means for changing the function assignment of the operation keys and a memory, and the operation is performed on the screen of the display means by inputting a specific key of the operation keys of the operation means. Means for displaying an operation explanatory view of the operation keys of the means, and a memory, and by operating the key input of the operation means corresponding to one of the operation keys displayed in the operation illustration, Means for displaying an explanation message by adding it to the operation explanation diagram, and performing a process corresponding to the key by re-keying the key of the operation means having the explanation message Help screen display comprising a means for, that and means for erasing the description message by inputting a different key than the operating means with the description message. 6. The help screen display device according to any one of claims 2 to 5, further comprising means for changing a display state between an invalid key and an effective key in the operation explanatory diagram. Help screen display device. 7. The help screen display device according to claim 6, wherein the means for changing the display state changes the display color or the display brightness between the invalid key and the valid key. 8. The help screen display device according to claim 6, wherein the means for changing the display state causes the effective key to blink. 9. The help screen display device according to claim 6, wherein the means for changing the display state displays only the valid key without displaying the invalid key.