JPH069382B2 - Image display device having an IC memory card - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to an image display device provided with a removable IC memory card.

BACKGROUND OF THE INVENTION In recent years, pocket TVs having excellent portability have been put into practical use and have become widespread. When watching this kind of pocket TV outdoors, for example, we want to record the image or sound displayed on the screen by the user, such as weather maps for weather forecasts, list of ingredients for cooking programs, mailing addresses for sweepstakes for quiz programs, etc. There were many cases.

Further, in particular, when the teletext broadcast, which has been conventionally used for breaking news or sports news using a vertical blanking period (hereinafter abbreviated as “VBL”) of an image signal, has become more popular, the recording of the teletext image is performed. Will also be needed.

However, as described above, the advantage of the pocket TV is that it is excellent in portability. Therefore, in order to record a display image or sound on the pocket TV, the VTR is used.
It is virtually difficult to carry with you at all times. It is also possible to temporarily stop the desired screen as a still image using the display buffer in the pocket TV, but in that case, the display cannot be performed, so while the image is stationary I cannot see the images being broadcast.

Therefore, it is conceivable to install a removable IC memory in the pocket TV to store the still image. Some examples of such a pocket TV will be described.

FIG. 1 shows the external structure. In the figure, 11 is a case body, and a liquid crystal panel is provided on the front surface of the case body 11.
A keyboard 12, a keyboard 13 and a channel display unit 14 are provided.
Further, a volume switch 15 and a changeover switch 16 are provided on the side of the case body 11. Then, the case body 11
A rod antenna 17 and a card insertion opening 18 are provided on the upper part of the. An IC card 19 provided with a connector terminal 191 at a specified position is inserted into and removed from the card insertion port 18.

Next, the configuration of the electronic circuit provided in the case body 11 will be described with reference to FIG. In the figure, 21 is a control circuit. The control circuit 21 controls each circuit according to a key input signal from the keyboard 13.
Input / output of data to / from each of the V circuit 22 and the card interface 23, output of the gate signal D to the gate circuits 24 and 25, output of the gate signal W to the gate circuit 26, gate circuit
The output of the gate signal R ₁ to 27, to output the gate signal R ₂ to the gate circuit 28. The TV circuit 22 is a control circuit
The received signal input from the rod antenna 17 is processed according to the control data from 21 and the image signal is output to the A / D conversion unit 29. The A / D conversion unit 29 converts an image signal of an analog value input from the TV circuit 22 into a digital value, for example, a 4-bit signal, and supplies it to the liquid crystal driver 30 via the gate circuit 24 and also to the gate circuit. It outputs to RAM31 via 25, respectively. The RAM 31 temporarily stores the transmitted image data screen portion, and stores the stored content in either the liquid crystal driver 30 via the gate circuit 28 or the card interface 23 via the gate circuit 26. Output. The card interface 23 writes the image signal input from the RAM 31 to the IC card 19 according to the control data from the control circuit 21, reads the image signal written in the IC card 19, and outputs the image signal via the gate circuit 27. RAM31
Send to. In the liquid crystal driver 30, the A / D converter 29
Image signal output from the TV circuit 22 sent from the IC card 19 via the gate circuit 24, or an image stored in the IC card 19 sent from the card interface 23 via the gate circuit 27, RAM 31, and gate circuit 28. According to the signal
The liquid crystal panel 12 is driven to display a television image.

Next, the operation will be described. First, when the changeover switch 16 is operated to "TV" to enter the television viewing mode, the gate signal D from the control circuit 21 to the gate circuits 24 and 25 is "1".
And the other gate signals W, R ₁ and R ₂ are “0”. As a result, the television image signal received by the rod antenna 17 and processed by the TV circuit 22 is A / D converter 29.
It is sent to the liquid crystal driver 30 via the gate circuit 24 after being digitized by
Sent to 31. The liquid crystal driver 30 drives the liquid crystal panel 12 for display in accordance with the television image signal sent from the A / D converter 29 via the gate circuit 24. During this time, RA
An image signal similar to that of the liquid crystal driver 30 is always written in M31, but the gate circuit 26 and the gate circuit 28 are both the control circuit 21.
Since the gate signals W and R ₂ from "0" are "0", it is in the closed state, and the written signal is not read.

If it is desired to record an image, the changeover switch 16 which was at the "TV" position is changed to the "W" position to set the image signal writing mode. Along with this, the gate signal D from the control circuit 21 to the gate circuits 24 and 25 and the gate signal W to the gate circuit 26 become "1", and the other gate signals R ₁ and R ₂ become "0". On the other hand, the control circuit 21 further sends control data for instructing the writing to the IC card 19 to the card interface 23. The television image signal received by the rod antenna 17 and processed by the TV circuit 22 is sent to the liquid crystal driver 30 via the gate circuit 24 after being digitized by the A / D converter 29, and the gate circuit 25 It is sent to the RAM 31 via the. The liquid crystal driver 30 drives the liquid crystal panel 12 for display in accordance with the television image signal sent from the A / D converter 29 via the gate circuit 24. During this period, an image signal similar to that of the liquid crystal driver 30 is written in the RAM 31. Here, the gate circuit 26 is in the open state because the gate signal W from the control circuit 21 is "1", so that the image signal written in the RAM 31 is read out, and the card circuit 26 reads the image signal. Sent to interface 23. The card interface 23 is a control circuit
The image signal sent according to the control data of 21 is output to the IC card 19 and stored therein.

The timing of writing the image signal in the IC card 19 will be described here. Although one screen is constantly updated and recorded in the RAM 31 in synchronization with the vertical synchronizing signal of the television signal (the synchronizing signal system is not shown), the switching is performed. With the switch 16 set to the "W" position, at the moment when the write key in the keyboard 13 is pressed, one screen from the vertical synchronizing signal that comes immediately after that is read
IC card from AM31 via card interface 23
It is supposed to write in 19.

Next, when the image signal recorded in the IC card 19 is to be displayed on the liquid crystal panel 12, the changeover switch 16 is switched to the "R" position this time to set the read mode of the recorded image. By this operation, the control circuit 21 sets the gate signal R ₁ to the gate circuit 27 and the gate signal R ₂ to the gate circuit 28 to “1” and the other gate signals D and W to “0”, while the card interface Control data for instructing the reading of the image signal recorded in the IC card 19 is sent to 23.
The gate signal D to the gate circuits 24 and 25 is "0"
Since these gate circuits 24 and 25 are in the closed state, they are received by the rod antenna 17, and the TV circuit 22 is received.
The image signal of the television processed in (4) is not sent to the liquid crystal driver 30 and the RAM 31 after being digitized by the A / D converter 29. The card interface 23 reads the image data recorded in the IC card 19 according to the control data of the control circuit 21, and sends it to the RAM 31 via the gate circuit 27 which is in an open state by the gate signal R ₁ from the control circuit 21. To do. The RAM 31 temporarily stores the sent image signal,
The stored contents are output, and the output image data is sent to the liquid crystal driver 30 via the gate circuit 28 which is in an open state by the gate signal R ₂ of the control circuit 21. Then, the liquid crystal driver 30 drives the liquid crystal panel 12 for display in accordance with the image signal from the RAM 31, and displays the image recorded in the IC card 19 as a still image.

In this example, the TV circuit 22 is merely for obtaining a normal TV image, but this is a TV circuit for teletext by a method such as full-screen fixed display, super fixed display, and subtitle display. It is also possible. The TV circuit 22 for teletext will be briefly described below.

Unlike a normal television video signal, a teletext signal is superimposed and sent during a vertical blanking period (VBL) of a television signal. Figure 3 shows the VBL,
It is composed of 21 horizontal scanning periods H. As shown in the figure, the 10th to 21th odd fields and the 273h to 284h even fields can be used in principle for multiplex broadcasting, but do not interfere with the currently used television. Depending on the conditions, it is considered to use 16th and 21H of the odd field and 279H and 284H of the even field.

FIG. 4 shows the circuit configuration of the TV circuit 22 for receiving the teletext, which is roughly divided into three blocks: a demodulation section 111, a character signal processing section (decoder section) 112, and a display section 113.

The demodulation unit 111 includes a tuner 114, a video intermediate frequency signal processing circuit 115, and a video signal / color signal processing circuit 116. The demodulation unit 111 demodulates television radio waves received by the rod antenna 17, and the obtained video signal is decoded by the decoder unit 112 and It is supplied to the display unit 113.

The decoder unit 112 includes the keyboard 13, sampling circuit 117, clock generation circuit 118, synchronization separation circuit 119, AB.
C circuit 120, clamp slice circuit 121, write control circuit
122, memory 123, and read control circuit 124.

The decoder unit 112 extracts the character signal superimposed in the vertical blanking period of the video signal, selects the signal of the program designated by the keyboard 13 and writes it in the memory 123, and the contents of the memory 123 are stored in the field. The character signal is repeatedly read out at a cycle (every 160 seconds) and supplied to the display unit 113.

The display unit 113 includes a video switching / mixing circuit 125 and a color output circuit 12.
6, the signal of the TV program and the signal of the character program are switched, and the image signal is mixed for superimposing characters on the TV program, and the image signal is converted into the A / D converter of FIG.
Output to 57.

The circuit shown in FIG. 2 has a monochrome television configuration, but in the case of color, signals of R, G, and B systems are A / D.
It suffices to provide three A / D conversion units for conversion and supply R, G, B data to the corresponding R, G, B segments of the liquid crystal panel 12.

Next, another example will be described.

Since the external configuration is almost the same as that shown in FIG. 1, the same parts are designated by the same reference numerals and the description thereof will be omitted.

FIG. 5 shows the configuration of the electronic circuit. In the figure
Reference numeral 33 denotes a control circuit, which controls the entire circuit according to the operation of the volume switch 15 and the change-over switch 16, and the control data is sent to each circuit. The received signal received by the rod antenna 17 is TV
Input to the circuit 34. The TV circuit 34 processes the input received signal, and the obtained image signal is A / D converter 35.
Then, the audio signal is output to the audio circuit 36, respectively. A / D
The conversion unit 35 digitizes the input image signal and outputs it to the liquid crystal driver 37 to display an image on the liquid crystal panel 12. The audio circuit 36 also sends the input audio signal to the selector 38 and the A / D conversion circuit 38. The A / D conversion circuit 39 converts the sent analog-valued audio signal into a digital-valued audio signal and outputs it to the encoding circuit 40. The encoding circuit 40 encodes the audio signal of the digital value from the A / D conversion circuit 39 in order to make it suitable for storage, and the encoded audio signal is sent to the memory 41 and stored. To be done. The memory 41 is appropriately written / read by the card interface 42. The card interface 42 writes the voice signal read from the memory 41 into the IC card 19 and the voice written in the IC card 19. The signal is read and stored in the memory 41. The voice signal stored in the memory 41 from the card interface 42 is then sent to the compounding circuit 43 to be compounded. Then, the synthesized voice signal is again converted into the original analog voice signal by the voice synthesis circuit 44 and is sent to the selector 38. Selector 38
Selects a voice signal from the voice circuit 36 and a voice signal from the voice synthesizing circuit 44 according to the control data from the control circuit 33, and sends the voice signal to the speaker 32 to output voice.

Next, the operation will be described.

First, when the changeover switch 16 is operated to "TV" to enter the television viewing mode, the reception signal received by the rod antenna 17 is input to the TV circuit 34. The TV circuit 34 processes the input reception signal and outputs the image signal to the A / D conversion unit 35.
The audio signal is output to the audio circuit 36, respectively. The A / D converter 35 digitizes the input image signal and outputs it to the liquid crystal driver 37 to display an image on the liquid crystal panel 12. In addition, the audio circuit 36 selects the audio signal to be input.
38 and the A / D conversion circuit 39. The selector 38 selects the received audio signal of the currently broadcast television program from the audio circuit 36 based on the control data from the control circuit 33, sends it to the speaker 32, and outputs the audio.

If it is desired to record a voice here, the changeover switch 16 which has been at the position of "TV" is changed to the position of "W" to set the voice signal writing mode. Along with this, the control circuit 33 outputs control data for instructing the writing of the audio signal to the IC card 19 to the card interface 42.
The card interface 42 reads the encoded voice signal stored in the memory 41 from the voice circuit 36 via the A / D conversion circuit 39 and the encoding circuit 40 by the control data and sends it to the IC card 19. Remember. During this time, selector 38
Since the sound signal from the sound circuit 36 is selected by the control data of the control circuit 33, the speaker 32 outputs the received sound of the currently broadcast television program. Memory 41
Has a storage capacity of, for example, 4 minutes, and is always recording endlessly, but if the write key in the keyboard 13 is operated while the changeover switch 16 is set to the "W" position, the memory at that time is stored. The 4-minute voice signal stored in 41 is recorded in the IC card 19 via the card interface 42. Therefore, it is possible to record the voice signal four minutes after the write key is pressed.

Next, when the voice signal recorded in the IC card 19 is to be output from the speaker 32, this time, the changeover switch 16 is switched to the "R" position to set the read mode of the recorded voice. By this operation, the control circuit 33 sends control data for instructing the card interface 42 to read the audio signal recorded in the IC card 19, and control data for selecting the audio signal output by the audio synthesis circuit 44 to the selector 38. Send each. The card interface 42 reads the audio signal written in the IC card 19 according to the control data from the control circuit 33 and sends it to the memory 41 for storage. This memory 41
The voice signal stored in is decoded by the decoding circuit 43, synthesized by the speech synthesis circuit 44, and sent to the selector 38.
The selector 38 selects the audio signal from the audio synthesis circuit 44 according to the control data of the control circuit 33 and sends it to the speaker 32. As a result, the speaker 32 outputs a sound according to the sound signal stored in the IC card 19.

Next, still another example will be described. In this example, a color image of a television is recorded on an IC card, but when the storage capacity of one IC card is small and the color still image cannot be recorded, the image information of R, G, B is displayed. It is intended to record on three IC cards separately.

The external structure is exactly the same as that shown in FIG. 1, so the same parts are designated by the same reference numerals and the description thereof will be omitted.

FIG. 6 shows a structure of an electronic circuit provided in the case body 11. In the figure, reference numeral 45 is a control circuit for controlling each circuit in response to a key input signal from the keyboard 13. The control circuit 45 includes gate circuits 46a to 46c,
A gate signal D in 47a to 47c, the gate signal _W R to the gate circuit 48a through _48c, W G, and _{W B,} the gate signal RD to the gate circuit 49a to 49c, a gate signal to the gate circuit 50 a to 50 c R
D _{R, RD} G, while output the RD _B, the TV circuit 51 performs input and output of the card interface 52 respectively and data. The TV circuit 51 processes a television reception signal input from the rod antenna 17, and converts the red (R) signal of the three color image signals of red, green, and blue into an RA / D converter.
53a, the green (G) signal is output to the G-A / D converter 53b, and the blue (B) signal is output to the B-A / D converter 53c. These RA / D converter 53a, GA / D converter 53b, BA /
The D conversion unit 53c digitizes and outputs the input image signal of the analog value. Then, the RA / D converter 53a
Output to the liquid crystal driver 54, the R-RAM 55a, and the G-A / D converter 53b via the gate circuit 46a and the gate circuit 47a.
Output to the liquid crystal driver 54 and the G-RAM 55b via the gate circuit 46b and the gate circuit 47b, and the B-A / D converter 53c.
Output is sent to the liquid crystal driver 54 and the B-RAM 55c via the gate circuit 46c and the gate circuit 47c, respectively, and stored therein. R-RAM55a, G-RAM55b, B-RAM55
The image signal stored in c is transferred to the card interface 52 via the gate circuits 48a to 48c and also to the gate circuits 49a to 49c.
Is output to the liquid crystal driver 54 via. The card interface 52 uses the R-RA according to the data from the control circuit 45.
The image signals from the M55a, G-RAM55b, and B-RAM55c are written in the IC card 19, and the image signals written in the IC card 19 are read out and read out via the gate circuits 50a to 50c.
-Send to RAM55a, G-RAM55b, B-RAM55c. In this case, as the IC card 19, three IC cards 19a to 19c are used as shown in FIG. IC card 19
a represents the R signal of the three color image signals of red, green and blue as IC
The card 19b stores the same G signal, and the IC card 19c stores the same B signal.
It is performed in order by repeating insertion and removal at 18. The liquid crystal driver 54 includes the gate circuits 46a to 46c from the RA / D converter 53a, the GA / D converter 53b, the BA / D converter 53c.
Image signal or R-RAM55 sent via
a, G-RAM55b, B-RAM55c to gate circuit 49a-
LCD panel 1 according to the image signal sent via 49c
Drive 2 to display a color image.

Next, the operation will be described.

First, in the television viewing mode in which the change-over switch 16 is set to the "TV" position, the control circuit 45 causes the gate circuits 46a to 46a.
c, the gate signal D is "1" to 47a to 47c, other gate signal _{W R, W G, W B} , RD, RD R, RD G, RD
_B is all "0". As a result, the R signal, the G signal, which form the color image signal output from the TV circuit 51,
The B signal is supplied to the RA / D converter 53a and the GA / D converter 53b.
After being digitized by the B-A / D converter 53c, the R-RAM 55a and the G-RAM 5 are supplied to the liquid crystal driver 54 via the gate circuits 46a to 46c and the R-RAM 55a and G-RAM 5 via the gate circuits 47a to 47c.
5b and B-RAM 55c. In the liquid crystal driver 54, the liquid crystal panel 12 is responsive to the transmitted color image signal.
Is driven to display a color image. On the other hand, RR
In AM55a, G-RAM55b and B-RAM55c, R-
A / D converter 53a, G-A / D converter 53b and B-A / D
The image signal sent from the conversion unit 53c through the gate circuits 47a to 47c is stored, and the stored content is the gate circuit 48.
A～48c, gate signal _W R of the gate circuit 49a~49c from TV circuit _51, W _G, W _B, since in the closed state by the RD, not read anywhere.

Next, when the color image writing mode is designated by setting the changeover switch 16 to the "W" position, the control circuit 45 changes the gate circuit to the gate circuit.
46a through 46c, the gate signal D is "1" to 47a to 47c, sequentially gate signal _W R to the gate circuit 48a through _48c, W G, is _{W B} in accordance with the data from the card interface 52 "1", The other gate signals RD, RD _R , RD _G and RD _B are “0”.
Becomes The control circuit 45 also includes a card interface 52.
The control data for instructing the writing of the signal to the color image to the IC card 19 is sent to the. The color image signal output from the TV circuit 51, that is, the R signal, the G signal, and the B signal is R
-A / D converter 53a, GA / D converter 53b and BA /
After being digitized by the D converter 53c, they are sent to the liquid crystal driver 54 via the gate circuits 46a to 46c and to the R-RAM 55a, G-RAM 55b and B-RAM 55c via the gate circuits 47a to 47c. The liquid crystal driver 54 drives the liquid crystal panel 12 to display a color image according to the transmitted color image signal. On the other hand, R-RAM55
a, G-RAM55b and B-RAM55c, RA-D
Converter 53a, GA / D converter 53b, and BA / D converter
The image signal sent from 53c via the gate circuits 47a to 47c is stored. Here, first, the gate signal W _R from the control circuit 45 to the gate circuit 48a becomes "1". As a result, the R signal stored in the R-RAM 55a is read and sent to the card interface 52. Here, as the IC card 19, when the IC card 19a is inserted into the card insertion slot 18 and the "R write key" of the keyboard 13 is operated, the card interface 52 receives the R signal sent by the control data from the control circuit 45. It is written in and stored in the IC card 19a.
Writing is completed, IC card 1 replaces IC card 19a
When 9b is inserted and the "G write key" is operated, data is sent from the card interface 52 to the control circuit 45.
Control circuit 45, the data gate signal W _R to the gate circuit 48a in response to a "0", instead the gate circuit 48b
The gate signal W _G to the gate is set to "1". Then G-RA
The G signal stored in M55b is read out and sent to the card interface 52. The card interface 52 sends the G signal sent by the control data from the control circuit 45 to the I signal.
Write and store in C card 19b. Then, when the writing is completed, the IC card 19c is inserted in place of the IC card 19b, and the "B write key" is operated, the data is sent from the card interface 52 to the control circuit 45 again. Control circuit 45 to "0" to the gate signal W _G of the gate circuit 48b in response to this data, a "1" gate signal W _B to the gate circuit 48c instead. Then, B-RAM55
The B signal stored in c is read and sent to the card interface 52. The card interface 52 is a control circuit
The B signal sent by the control data from 45 is written and stored in the IC card 19c. IC card 19a ~
This means that the writing of all the color image signals to 19c is completed.

Then, the changeover switch 16 is set to the “R” position, and the IC card
If you specify a read mode of the recorded color image 19 a - 19 c, the gate circuit 46a through 46c, the gate signal W _R to the gate signal D and the gate circuit 48a~48c to 47a to _47c, W _G,
W _B is "0", the gate signal RD to the gate circuit 50a~50c
_{R, RD} G, RD _B are sequentially "1", the middle gate signal RD to the gate circuit 49a~49c is "1" in response to data from the card interface 52. Color image signals output from the TV circuit 51, that is, R signal, G signal, B
The signals are digitized by the RA / D converter 53a, the GA / D converter 53b, and the BA / D converter 53c, respectively, but the gate signal D sent from the control circuit 45 is " 0 "
Therefore, since the gate circuits 46a to 46c and 47a to 47c are in the closed state, they are not delivered to anywhere. on the other hand,
In the card interface 52, the R signal stored in the IC card 19a which is first inserted as the IC card 19 is stored in the control circuit 45 by operating the "R read key" in the keyboard 13.
It is read and output by the control data from. At this point, in the gate circuit 50 a to 50 c, only the gate signal RD _R is input from the control circuit 45 to the gate circuit 50a is "1". Therefore, the R signal of the IC card 19a output from the card interface 52 is sent to the R-RAM 55a via the gate circuit 50a and stored therein.
After reading the contents stored in the IC card 19a, this IC
When the IC card 19b is inserted into the card insertion slot 18 instead of the card 19a and the "G read key" is operated, data is sent from the card interface 52 to the control circuit 45. Control circuit 45, IC data gate signal RD _R to the gate circuit 50a in response to a "0", with a "1" to the gate signal RD _G to the gate circuit 50b instead, the card interface 52 The control data for instructing to read the stored contents of the card 19b is output. Card interface 52
According to this, when the G signal stored in the IC card 19b is read out and output, the read G signal is in turn detected by the gate circuit.
It is sent to the G-RAM 55b via 50b and stored. Then, the reading of the stored contents of the IC card 19b is completed, and this I
IC card 19c in place of C card 19b, card insertion slot 18
And the "B read key" is operated, data is sent from the card interface 52 to the control circuit 45. Control circuit 45, the data gate signal RD _G to the gate circuit 50b in response to a "0", instead the gate circuit 50c
With a "1" gate signal RD _B to outputs control data for instructing the reading of the contents of the IC card 19c to the card interface 52. Card interface
When 52 reads out and outputs the B signal stored in the IC card 19b accordingly, the read B signal is sent to the G-RAM 55c via the gate circuit 50c this time and stored therein. R
-IC for RAM55a, G-RAM55b and B-RAM55c
When the "display key" in the keyboard 13 is operated at the stage where the R signal, G signal and B signal stored in the card 19a, IC card 19b and IC card 19c are read, the control circuit 45 shifts to the gate circuits 49a to 49c. Gate signal RD of "0" becomes "1", and R-RAM55a, G-RAM5
The contents of 5b and the B-RAM 55c are sent to the liquid crystal driver 54 via the gate circuits 49a to 49c. And LCD driver
54 is an R-RAM 55a, a G-RAM 55b and a B-RAM 55
According to R signal, G signal and B signal sent from c,
The liquid crystal panel 12 is driven to display a color image.

Next, still another example will be described. In this example, IC
When the memory capacity of the card is not so large, the image signal is divided into a plurality of IC cards for recording. For example, when the number of display pixels in the horizontal direction of the liquid crystal panel is N dots, an odd number By recording N / 2 dots, and recording an even number of N / 2 dots on the other sheet, even one sheet can be recorded as an image with a reduced amount of information, and if two sheets are used, high resolution recording can be performed. It was made possible.

The external structure is exactly the same as that shown in FIG. 1, so the same parts are designated by the same reference numerals and the description thereof will be omitted.

FIG. 8 shows the structure of an electronic circuit provided in the case body 11. In the figure, 56 is a keyboard 13
It is a control circuit that performs a control operation of each circuit according to a key input signal from. The control circuit 56 includes an A / D converter 57,
A sampling clock φ _{1 having} a frequency corresponding to N clocks per scanning line is provided to the distributor 58 and the multiplexer 59.
To the gate circuits 60a and 60b, the gate circuits 61a and 61b, the gate signal W1 to the gate circuit 62a, the gate signal W2 to the gate circuit 62b, the gate signal R1 to the gate circuit 63a, and the gate signal R1 to the gate circuit 63b. The gate signal R2 is sent to the gate circuits 64a and 64b. When the television signal is received by the rod antenna 17, the received signal is sent to the TV circuit 65. The TV circuit 65 processes the received signal sent thereto, and sends the obtained television image signal to the A / D converter 57. The A / D converter 57 samples and digitizes the signal sent from the control circuit 56 according to the sampling clock φ ₁ , and the digitized image signal is sent to the distributor 58. The distributor 58 controls the image signal from the A / D converter 57 by the control circuit 56.
By the sampling clock φ ₁ from, and is output in a plurality, for example, two. The distributed image signal output from the distributor 58 is sent to the multiplexer 59 via the gate circuits 60a and 60b and to the first via the gate circuits 61a and 61b.
It is sent to the RAM 66 and the second RAM 67. First RAM66,
The second RAM 67 stores the input image signal, and outputs the stored content to the card interface 68 via the gate circuits 62a and 62b and to the multiplexer 59 via the gate circuits 64a and 64b. The card interface 68 sends the image signal sent via the gate circuit 62a and the gate circuit 62b to the IC card 19 in accordance with the control data from the control circuit 56 to store the image signal therein.
The image signal read from the gate circuit 63a, the gate circuit 6
It is sent to the first RAM 66 and the second RAM 67 via 3b. In this case, two IC cards 19d and 19 are used as the IC card 19.
Use e. The IC card 19d and the IC card 19e are divided by the distributor 58, and the first RAM 66 and the second RA
The image signal stored and read in M67 is stored, and each storage is sequentially performed by repeatedly inserting and removing one by one at the card insertion port 18. The multiplexer 59 uses the image signal sent from the distributor 58 via the gate circuits 60a and 60b or the first RAM 66 and the second RAM 67.
The image signals sent from the gate circuits 64a and 64b are superposed in accordance with the sampling clock φ ₁ from the control circuit 56 and output to the liquid crystal driver 69 in the same state as the output of the A / D converter 57. And the LCD driver 69
The liquid crystal panel 12 is driven to display according to the image signal sent from the multiplexer 59, and an image is displayed.

Next, the operation will be described.

First, in the television viewing mode in which the changeover switch 16 is set to the "TV" position, the control circuit 56 causes the gate circuits 60a, 60 to operate.
b, the gate signal D to the gate circuits 61a and 61b is "1", and the other gate signals W1, W2, R1, R2 and RD are all "0". In this case, the image signal obtained by the TV circuit 65 is digitized by the A / D converter 57 and then distributed by the distributor.
At 58, it is divided into two according to the sampling clock φ ₁ , and for example, the odd number is outputted to the gate circuit 60a, 61a side, and the even number is outputted to the gate circuit 60b, 61b side. Here, since the gate circuits 60a, 60b, 61a, 61b are opened by the gate signal D, the output of the distributor 58 is sent to the multiplexer 59, the first RAM 66, and the second RAM 67 via them. The multiplexer 59 superimposes two image signals input in synchronization with the distribution operation of the distributor 58 according to the sampling clock φ ₁ and sends it to the liquid crystal driver 69. The liquid crystal driver 69 drives the liquid crystal panel 12 for display according to the image signal from the multiplexer 59, and displays a television image. On the other hand, sent to the first RAM66, the second RAM67,
The stored image signal is not read anywhere because both gate circuits 62a, 62b, 64a, 64b are closed by the gate signals W1, W2, RD.

Next, when the changeover switch 16 is set to the "W" position to specify the writing mode of the television image, the gate signal D from the control circuit 56 to the gate circuits 60a, 60b, 61a, 61b is "1", and the gate circuits 62a, 62b. The gate signals W1 and W2 to the gate interfaces 52 are sequentially set to "1" according to the data from the card interface 52, and the gate signals R1 and R2 to the other gate circuits 63a and 63b and the gate signal RD to the gate circuits 64a and 64b are set to "1". It becomes 0 ".
Further, the control circuit 56 sends control data for instructing the card interface 52 to write a signal to a television image on the IC card 19. The television image signal output from the TV circuit 65 is digitized by the A / D converter 57, and then distributed by the distributor 58 to two odd-numbered and even-numbered according to the sampling clock φ ₁ and output. . Here, since the gate circuits 60a, 60b, 61a, 61b are in the open state by the gate signal D, the output of the distributor 58 passes through them through the multiplexer 59, the first RAM 66, and the second RAM 67.
Sent to. The multiplexer 59 superimposes two image signals input in synchronization with the distribution operation of the distributor 58 according to the sampling clock φ ₁ and sends it to the liquid crystal driver 69. The liquid crystal driver 69 drives the liquid crystal panel 12 for display according to the image signal from the multiplexer 59, and displays a television image. On the other hand, the first RAM 66 and the second RAM 67 store the image signal sent from the distributor 58 via the gate circuits 61a and 61b. Therefore, odd-numbered image signals are stored in the first RAM 66 and even-numbered image signals are stored in the second RAM. Here as IC card 19 I
When the C card 19d is inserted into the card insertion slot 18 and the "first writing key" in the keyboard 13 is operated, the control circuit
The gate signal W1 from 56 becomes "1" and the gate circuit 62
The a is closed and the image data stored in the first RAM 66 is read out to the card interface 68. The card interface 68 receives the first data from the control data from the control circuit 56.
The image signal read from the RAM 66 is written and stored in the IC card 19d. After writing, insert the IC card 19e in place of the IC card 19d into the card insertion slot 18,
When the "second write key" is operated, the control circuit 56 sets the gate signal W1 to the gate circuit 62a to "0" according to this data, and instead, the gate signal W1 to the gate circuit 62b.
Set 2 to “1”. Then, the image signal stored in the second RAM 67 is read this time and sent to the card interface 68 via the gate circuit 62b. Card interface
68 writes and stores the image signal sent by the control data from the control circuit 56 in the IC card 19e. Thus, the writing of the image signal to the two IC cards 19, that is, the IC cards 19d and 19e is completed.

When the changeover switch 16 is set to the "R" position and the read mode of the image signals recorded in the IC cards 19d and 19e is designated, the control circuit 56 controls the gate signals D to the gate circuits 60a, 60b, 61a and 61b and the gate signals. Gate signal W to circuits 62a and 62b
1, W2 is "0", gate signals R1 and R2 to the gate circuits 63a and 63b are sequentially "1" according to the data from the card interface 52, and gate signals R to the gate circuits 64a and 64b.
Let D be "1". Further, the control circuit 56 sends control data for instructing the card interface 52 to read out the television image signal of the IC card 19. The television image signal output from the TV circuit 65 is digitized by the A / D conversion unit 57, and is then divided into two by the divider 58 according to the sampling clock φ1 and is output, but the gate circuits 60a and 60b. , The gate signal D from the control circuit 56 is "0" in both the gate circuits 61a and 61b, so that the circuit is closed.
I can't send it anywhere. On the other hand, when the IC card 19d is first inserted and the "first read key" in the keyboard 13 is operated, the IC card 19d is controlled by the control data from the control circuit 56.
The image signal stored in is read out to the card interface 68 and sent out. Here, the gate signal R1 to the gate circuit 63a is "1", the gate signal R2 to the gate circuit 63b is "0", and the image signal of the IC card 19d read by the card interface 68 is the gate circuit. It is sent to the first RAM 66 via 63a and stored therein. When the reading of the stored contents of the IC card 19d is completed, the IC card 19e is inserted into the card insertion slot 18 in place of the IC card 19d, and the "second read key" is operated, data is transferred from the card interface 68 to the control circuit 56. Is sent. The control circuit 56 sets the gate signal R1 to the gate circuit 63a to "0" according to this data, and instead, the gate signal R1 to the gate circuit 63b.
Set 2 to “1”. At the same time, the control circuit 56 sends to the card interface 68 control data for instructing to read the stored contents of the IC card 19e. Card interface 68
When the IC card 19e reads and outputs the image signal stored in the IC card 19e, the image signal is transferred to the second RA through the gate circuit 63b.
It is sent to M67 and stored. First RAM 66, second RAM
The image signal stored in 67 is sent to the multiplexer 59 via the gate circuits 64a and 64b because the gate signal RD to the gate circuits 64a and 64b is "1".
The multiplexer 59 superimposes two image signals input from the first RAM 66 and the second RAM 67 according to the sampling clock φ1 and sends them to the liquid crystal driver 69. Then, the liquid crystal driver 69 drives the liquid crystal panel 12 to display according to the image signal from the multiplexer 59, and displays the images stored in the IC cards 19d and 19e.

In this example, the image signals are distributed and stored in the two IC cards 19d and 19e, which are superimposed and reproduced and displayed on the screen.
9e, It is also possible to reproduce and display only one of the stored signals, although the resolution will drop. Then, by reproducing the image signal stored in the two IC cards 19d and 19e and stored and displaying it on the screen, an image with higher resolution can be obtained.

Further, in this example, the TV circuit 65 is merely for obtaining a normal TV image, but this is especially used as a TV circuit for teletext by a method such as full screen fixed display, super fixed display, and subtitle display. It is also possible to do it. The configuration of the TV circuit 65 for teletext is almost the same as that shown in FIG. 4, and the description thereof will be omitted.

[Object of the Invention] Although the background art has been described in detail above, the present invention provides an image display device having an IC memory card detachably
The present invention is to provide an image display device that employs an information reduction method that is different from any of the above-mentioned methods, when the amount of information is reduced and image information is stored when the storage capacity of the memory card is not very large.

SUMMARY OF THE INVENTION The present invention is, in an image display device equipped with an IC memory card detachably, an A / D conversion means for converting a television signal into A-bit digital gradation data, and the A-bit gradation. The first memory stores the upper B bits (B <A) of the data, the second memory stores the lower AB bits of the A-bit grayscale data, and the first memory. Means for transferring B-bit gradation data to a removable first IC memory card, and a second IC memory card removable from AB bit gradation data stored in the second memory Means for transferring the B-bit gradation data stored in the first IC card memory to the first memory, and a second I
Means for transferring the A-B bit gradation data stored in the C card memory to the second memory, and A based on the gradation data stored in the first memory or the second memory.
And a display means for selectively displaying gradation of B or B bits.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIG.
In this embodiment, when the display capacity of an IC memory card is not so large and it has A-bit gradation information per display dot, this A-bit is divided into a plurality of times and a plurality of IC memory cards are divided. The image can be recorded separately by dividing the image into a single image with a reduced contrast, and by using two images, a high-contrast image can be recorded.

The external structure is exactly the same as that shown in FIG. 1, so the same parts are designated by the same reference numerals and the description thereof will be omitted.

FIG. 9 shows a structure of an electronic circuit provided in the case body 11. In the figure, reference numeral 70 is a control circuit for controlling each circuit according to a key input signal from the keyboard 13. The control circuit 70 includes gate circuits 71a to 71e,
The gate signal D is supplied to the gate circuits 72a to 72e, and the gate circuit 73a.
To 73c, the gate signal W1 to the gate circuits 73d and 73e, and the gate signal R1 to the gate circuits 74a to 74c.
The gate signal R2 is applied to the gate circuits 74d and 74e, and the gate circuit 75a
The gate signal RD is sent to ~ 75e. Rod antenna 17
When a television signal is received at, the received signal is T
It is sent to the V circuit 76. The TV circuit 76 processes the received signal sent thereto, and sends the obtained television signal, for example, an image signal to the A / D conversion unit 77. The A / D converter 77
It is assumed that the transmitted signal is digitized, and the digitized image signal is such that parallel gradation data, for example, of 5 bits, is output in the order of each display dot. The output of the A / D converter 77 is the gate circuits 71a to 7a.
1e to the shift register 78, and also the gate circuit 72a
~ 72c, 72d, 72e is sent to the first RAM79, the second RAM80. The first RAM 79 and the second RAM 80 separately store the input image signal, that is, the upper 3 bits and the lower 2 bits of each display dot, and store the stored contents in the gate circuit.
Card interface 81 via 73a-73c, 73d, 73e
And to the shift register 78 via the gate circuits 75a to 75e. The card interface 81 uses the gate circuits 73a to 73c, 73 according to the control data from the TV circuit 76.
The image signal sent via d, 73e is sent to the IC card 19 for storage, and the image signal read from the IC card 19 is transferred to the first R via gate circuits 74a to 74c, 74d, 74e.
It is sent to the AM 79 and the second RAM 80. In this case, two IC cards 19f and 19g are used as the IC card 19. These two IC cards 19d and 19e are the first RA
The image signals stored and read by the M66 and the second RAM 67 are stored, and each storage is performed in order by repeating insertion and removal one by one at the card insertion slot 18. The shift register 78 includes the A / D converter 77 to the gate circuit 71.
a through 71e, or the first RAM 79, the second RAM 80
The image signals of 5 bits for each display dot sent from the above through the gate circuits 75a to 75e are sequentially stored, and when one horizontal line is stored, the stored contents are sent to the buffer register 82. The buffer register 82 stores the image signal from the shift register 78 and then sends it to the gradation signal generating circuit 83. The gradation signal creating circuit 83 creates a gradation signal corresponding to each display dot from an image signal having an information amount of 5 bits for each display dot sent from the buffer register 82, and outputs the gradation signal. Send to liquid crystal panel 12. A drive signal is input to the liquid crystal panel 12 from the scanning side driver 84, and an image is displayed by the drive signal and the gradation signal.

Next, the operation of the above embodiment will be described.

First, in the television viewing mode in which the changeover switch 16 is set to the "TV" position, the TV circuit 76 moves the gate circuits 71a to 71a.
e, the gate signal D to the gate circuits 72a to 72e is "1", and the other gate signals W1, W2, R1, R2, RD are all "0". In this case, the image signal obtained by the TV circuit 76 is digitized by the A / D converter 77, and is output as 5-bit parallel gradation data for each display dot. Here, the gate circuits 71a to 71e and the gate circuits 72a to 72e
Is opened by the gate signal D, the A / D
The output of the conversion unit 77 is sent to the shift register 78, the first RAM 79, and the second RAM 80 via these. Shift register
78 sequentially shifts and stores the input serial signal, and sends the stored content to the buffer register 82. The buffer register 82 stores the image signal from the shift register 78 and then sends it to the gradation signal generating circuit 83. The gradation signal creating circuit 83 creates a gradation signal corresponding to each display dot from the image signal having the information amount of 5 bits for each display dot, and sends the gradation signal to the liquid crystal panel 12. . Then, the liquid crystal panel 12 is a driver on the scanning side.
A television image is displayed by the drive signal from 84 and the gradation signal from the gradation signal generating circuit 83. On the other hand, the first RA
The image signal sent to M79 and the second RAM 80 and stored is
Since the gate circuits 73a to 73c, 73d and 73e and the gate circuits 75a to 75e are both closed by the gate signals W1, W2 and RD, they are not read anywhere.

Next, when the changeover switch 16 is set to the "W" position and the television image writing mode is designated, the gate signal D from the control circuit 70 to the gate circuits 71a to 71e and the gate circuits 72a to 72e.
Is "1", the gate signals W1 and W2 to the gate circuits 73a to 73c, 73d and 73e are "1" sequentially according to the data from the card interface 81, and the other gate circuits 74a to 74c and 74d,
The gate signals R1 and R2 to 74e and the gate signal RD to the gate circuits 75a to 75e become "0". In addition, the control circuit 70
Sends to the card interface 81 control data for instructing the writing of a signal to a television image on the IC card 19. The television image signal output from the TV circuit 76 is digitized by the A / D conversion unit 77 and output as 5-bit parallel gradation data for each display dot.
Here, since the gate circuits 71a to 71e and the gate circuits 72a to 72e are in the open state by the gate signal D, the output of the A / D conversion unit 77 passes through them and the shift register 78 and the first R.
It is sent to the AM 79 and the second RAM 80. Shift register 78
Stores sequentially input serial signals while shifting them and sends the stored contents to the buffer register 82.
The buffer register 82 stores the image signal from the shift register 78 and then sends it to the gradation signal generating circuit 83.
The gradation signal creating circuit 83 creates a gradation signal corresponding to each display dot from the image signal having an information amount of 5 bits for each display dot, and the gradation signal is generated.
Send to. Then, the liquid crystal panel 12 displays a television image by the driving signal from the scanning side driver 84 and the gradation signal from the gradation signal generating circuit 83. On the other hand, the first RAM79
Stores the image signal of the upper 3 bits sent from the A / D converter 77 through the gate circuits 72a to 72c, and stores the second RA
The M80 stores the image signal of the lower 3 bits sent via the gate circuits 72d and 72e. Here, since the gate signal W1 from the TV circuit 76 is "1", the gate circuits 73a to 73c are in the open state, and the image data stored in the first RAM 79 is read to the card interface 81. Here, the IC card 19f is the IC card 19 and the card insertion slot 1
When the card is inserted into the memory card 8 and the "first writing key" in the keyboard 13 is operated, the card interface 81 writes the image signal read from the first RAM 79 to the IC card 19f and stores it in accordance with the control data from the control circuit 70. . When writing is completed, insert the IC card 19g in place of the IC card 19f into the card insertion slot 18, and operate the "second write key".
The card interface 81 sends data to the control circuit 70. The control circuit 70 responds to this data by the gate circuit 73.
The gate signal W1 to the a to 73c is set to "0", and the gate signal W2 to the gate circuits 73d and 73e is set to "1" instead. Then, the image signal stored in the second RAM 80 is read out this time, and the card interface 8 is read through the gate circuits 73d and 73e.
Sent to 1. The card interface 81 is a control circuit 70.
The image signal sent by the control data from the IC card is written into the IC card 19g and stored therein. This completes the writing of image signals to the two IC cards 19, that is, the IC cards 19f and 19g.

Then, the changeover switch 16 is set to the “R” position, and
When the read mode of the image signals recorded in 19f and 19g is designated, the control circuit 70 controls the gate signals D to the gate circuits 71a to 71e and 72a to 72e and the gate signals W1 to the gate circuits 73a to 73c, 73d and 73e. W2 is “0”, gate circuits 74a to 74c, 74d,
Card interface 8 for gate signals R1 and R2 to 74e
Sequentially “1” according to the data from 1, gate circuits 75a to 75
The gate signal RD to e is set to "1". In addition, the control circuit 7
At 0, control data for instructing the reading of the television image signal of the IC card 19 is sent to the card interface 81. The television image signal output from the TV circuit 76 is digitized by the A / D converter 77, but the gate circuit
Since the gate signal D from the control circuit 70 is "0" in both 71a to 71e and the gate circuits 72a to 72e, they are in a closed state and cannot be sent anywhere. On the other hand, in the card interface 81, an image signal stored in the IC card 19f which is initially inserted as the IC card 19 is stored by the control data from the control circuit 70 when the "first read key" of the keyboard 13 is operated. It is read and sent. Where the gate circuit 74
The gate signal R1 to a to 74c is "1", and the gate circuits 74d and 74
The gate signal R2 to e is "0", and the image signal of the IC card 19f read by the card interface 81 is sent to the first RAM 79 via the gate circuits 74a to 74c.
Remembered. When the reading of the stored contents of the IC card 19f is completed, the IC card 19g is inserted in place of the IC card 19f into the card insertion slot 18 and the "second read key" is operated, data is transferred from the card interface 81 to the control circuit 70. Is sent. The control circuit 70 responds to this data by the gate circuit 74.
The gate signal R1 to a to 74c is set to "0", and the gate signal R2 to the gate circuits 74d and 74e is set to "1" instead. At the same time, the control circuit 70 sends to the card interface 81 control data for instructing the reading of the stored contents of the IC card 19g. When the card interface 81 reads out and outputs the image signal stored in the IC card 19g, this image signal is sent to the second RAM 80 via the gate circuits 74d and 74e and stored therein. Since the gate signal RD to the gate circuits 75a to 75e is "1", the image signals stored in the first RAM 79 and the second RAM 80 are these gate circuits 75a to 75e.
Is synthesized into 5-bit data via the shift register
Sent to 78. The shift register 78 stores the input signals while sequentially shifting them and sends the stored contents to the buffer register 82. The buffer register 82 stores the image signal from the shift register 78 and then sends it to the gradation signal generating circuit 83. The gradation signal creating circuit 83 creates a gradation signal corresponding to each display dot from the image signal having the information amount of 5 bits for each display dot, and sends the gradation signal to the liquid crystal panel 12. . And the liquid crystal panel 12
Displays an image stored in the IC cards 19f and 19g according to the driving signal from the scanning side driver 84 and the gradation signal from the gradation signal generating circuit 83.

In the above-described embodiment, the two IC cards 19f and 19g are divided into a plurality of gradation data for each display dot as image signals and are stored separately, and are reproduced in a composite manner and displayed on the screen. IC card 19f or IC card 19g,
It is also possible to reproduce and display only one of the stored signals, although the resolution will drop. And two ICs
If the gradation signals stored in the cards 19f and 19g by being distributed are combined, reproduced, and displayed on the screen, an image with higher resolution can be obtained.

Further, in the above embodiment, the TV circuit 76 is merely for obtaining a normal TV image, but this is especially used as a TV circuit for teletext by a method such as full screen fixed display, super fixed display, and subtitle display. It is also possible to do it. The configuration of the TV circuit 76 for teletext is almost the same as that shown in FIG. 4, and the description thereof will be omitted.

[Effects of the Invention] As described in detail above, according to the present invention, A / D conversion means for converting a television signal into A-bit digital gradation data, and upper B bits of the A-bit gradation data. A first memory for storing (B <A), a second memory for storing lower A-B bits of the A-bit gradation data, and a floor for B-bits stored in the first memory. Means for transferring the tone data to the removable first IC memory card, and means for transferring the AB-bit gradation data stored in the second memory to the removable second IC memory card Means for transferring the B-bit grayscale data stored in the first IC card memory to the first memory, and A- stored in the second IC card memory.
Means for transferring B-bit gradation data to the second memory, and selective A-bit or B-bit gradation display based on the gradation data stored in the first memory or the second memory. Since it is equipped with a display means for displaying the image, it is possible to see a high-density image when viewing a TV image as it is, and when recording an image on an IC memory card, the amount of information is reduced but the content of the image is sufficient. It has the effect of being able to grasp.

[Brief description of drawings]

1 to 8 show an example of the background of the present invention. FIG. 1 is a perspective view showing an external configuration of an image display device in which an IC card is detachable, and FIG. 2 is a circuit configuration. Block diagram, FIG. 3 is a diagram showing a multiplexing position of a character signal, FIG. 4 is a block diagram showing a circuit configuration of a TV circuit for receiving a character broadcast, and FIG. 5 is a circuit configuration for explaining another background art. FIG. 6 is a block diagram showing a circuit configuration for explaining still another background art, FIG. 7 is a diagram showing an IC card inserted / removed in FIG. 6, and FIG. 8 is still another. FIG. 9 is a block diagram showing a circuit configuration for explaining the background art of the present invention, and FIG. 9 is a block diagram showing the circuit configuration of an embodiment of the present invention. 11 …… Case body, 12 …… Liquid crystal panel, 13 …… Keyboard, 14 …… Channel display, 15 …… Volume switch, 16 …… Changeover switch, 17 …… Rod antenna, 18…
… Card slot, 19,19a-19g …… IC card, 191 ……
Connector terminals, 21, 33, 45, 56, 70 ... Control circuit, 22, 34,5
1,65,76 …… TV circuit, 23,42,52,68,81 …… Card interface, 29,35,57,77 …… A / D converter, 30,37,54,
69 …… LCD driver, 31 …… RAM, 32 …… Speaker,
36 ... Voice circuit, 38 ... Selector, 39 ... A / D conversion circuit, 40 ... Encoding circuit, 41 ... Memory, 43 ... Decoding circuit, 44 ... Voice synthesis circuit, 53a ... R -A / D converter, 5
3b …… GA-D converter, 53c …… BA-D converter, 5
5a ... R-RAM, 55b ... G-RAM, 55c ... BR
AM, 58 ... Distributor, 59 ... Multiplexer, 66, 79 ...
... 1st RAM, 67, 80 ... 2nd RAM, 78 ... shift register, 82 ... buffer register, 83 ... gradation signal creating circuit, 84 ... scanning side driver, 111 ... demodulation section, 112 ...
Decoder section, 113 ... Display section, 114 ... Tuner, 115 ...
Video intermediate frequency signal processing circuit, 116 video signal / color signal processing circuit, 117 sampling circuit, 118 clock recovery circuit, 119 sync separation circuit, 120 ABC circuit, 121 clamp slice Circuit, 122 ... Write control circuit, 123 ... Memory, 124 ... Read control circuit, 125 ...
… Video switching / mixing circuit, 126 …… Color output circuit.

Claims (1)

[Claims] 1. An image display device having an IC memory card removably attached, wherein A / D conversion means for converting a television signal into A-bit digital gradation data, and a higher order of the A-bit gradation data. B bit (B <
A) for storing A), a second memory for storing lower A-B bits of the A-bit gradation data, and a B-bit gradation data stored in the first memory. Means for transferring to a removable first IC memory card; means for transferring the AB bit gradation data stored in the second memory to a removable second IC memory card; Means for transferring the B-bit gradation data stored in the first IC card memory to the first memory; and the A-B bit gradation data stored in the second IC card memory as the second And a display means for selectively performing A-bit or B-bit gradation display based on the gradation data stored in the first memory or the second memory. IC memory card characterized by An image display device equipped with.