KR100200129B1 - Apparatus for converting image position based on 2-image screen display in video image reproducing system - Google Patents

Abstract

[0001] The present invention relates to a screen position changing apparatus for two-screen reproduction of an image reproducing system, and more particularly to a screen position changing apparatus for two- And first and second video data of the first and second screens which are supplied with the read clock (RCLK) and the read only set signal (RRST), respectively, First and second data inversion means (28, 30) for converting the video signals of the readout first and second screens into analog signals, The width position of the screen display section W with respect to the video signal according to the first and second analog-converted screens corresponding to the selection state of the screen display section W by the selection signal inputted according to the first embodiment is In addition to this, in the second embodiment, An image multiplexing means 32 for multiplexing the video signals according to the selected state of the screen transition positions by the first and second screens so that the video signals according to the first and second screens are shifted to different display positions, And generates a pseudo vertical / vertical synchronizing signal (H SYNC / V SYNC) synchronously with the read clock R CLK and synchronously generates a dummy set signal R RST) according to the first embodiment of the present invention, a key setting for shifting the width of the screen display interval of the video signal of the first and second screens according to the first embodiment of the present invention, A function setting means 40 for performing a key setting operation for shifting the position of the screen display position of the video signal of the first and second screens according to the first embodiment of the present invention, By a key operation for moving the width position to the screen display section (W) The selection control signal for the screen display section W is generated on the basis of the read clock RCLK and the pseudo horizontal / vertical synchronization signal H SYNC / V SYNC from the pseudo signal generation means, On the basis of the read clock (RCLK) and the pseudo horizontal / vertical synchronizing signal (H SYNC / V SYNC) from the pseudo signal generating means by a key operation for position transition of the screen display A control unit 42 for generating a transition selection control signal for a display position of a width position to which the pseudo horizontal synchronizing signal H SYNC is supplied according to the first embodiment of the present invention, A selection signal generating means 44 for generating a selection signal corresponding to the selection signal W of the first and second screens and a selection signal generating means 44 for converting the selection signal according to the transition selection control signal according to the second embodiment of the present invention, A transition selection screen for mutually shifting screen display positions And a transition selection signal generating means for generating a selection signal for generating a video signal.

Description

A screen position conversion device for two-screen reproduction of a video reproduction system

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a screen position conversion apparatus for two-screen reproduction of a video reproduction system, and more particularly to a video reproduction system for performing position- The present invention relates to a screen position conversion apparatus for two-screen reproduction.

2. Description of the Related Art At present, a video reproduction system for reproducing video information recorded on a video recording medium such as a television broadcast signal and a video tape or a video disk has been generally adopted and in such a video reproduction system, A tuner receiving a channel of a television broadcast signal transmitted from the system to the airwave is incorporated and integrated with a video reproducing apparatus such as a video tape recorder or a video disk player that reads information recorded on a video recording medium such as a video tape or a video disk And provides a high quality image screen.

As a display device for forming an image screen in this image reproducing system, a direct view type image display device typified by a CRT (Cathode Ray Tube) and a liquid crystal display (LCD) device or an AMA (Actuated Mirror Array) A projection type image display device is used. In particular, in the case of the projection type video display device employing the AMA means, a plurality of pixel driving elements, for example, a MOS transistor corresponding to the number of pixels for driving a plurality of pixels provided on a screen of 640 * 480 size, An active matrix substrate arranged in the form of an array, an actuator formed on the active matrix substrate in a number corresponding to each of the plurality of pixels, for modulating the incident light by obliquely deforming in accordance with the image signal voltage applied from each pixel driving element And it disadvantageously has the disadvantages of the enlargement of the direct view type image display device such as the CRT and the sharpness of the image quality of the projection type image display device employing the LCD means.

On the other hand, in such a video reproducing system, a plurality of video signals from a plurality of video reproducing apparatuses that simultaneously select a plurality of channels of television broadcasting signals or reproduce video information from video recording media such as video tape recorders and video disk players, A main / sub-screen reproduction function for displaying a main / sub-screen on a screen screen of a main screen, and a two screen reproduction function for forming two screens by dividing a single screen screen to the left / right.

Among them, according to the two-screen reproduction processing apparatus of the video reproduction system, as shown in FIG. 1, a video signal of a first screen corresponding to one screen among two screens formed on a single screen screen is sampled and converted into digital data A second ADC 4 for sampling a video signal of a second screen corresponding to the other screen among the two screens and converting the sampled video signal into digital data; A first field memory 6 receiving the clock CLK1 synchronized with the sampling clock CLK1 and storing the image data according to the digitally converted first screen in units of video fields, A second field memory 8 for receiving the clock CLK2 synchronized with the clock CLK2 and storing the image data according to the digitally converted second picture in field units, 1 video data according to the screen A second DAC (Digital-Analog Converter) 10 for converting signals in the form of analog signals, a second DAC 12 for converting image data according to a second screen from the second field memory 8 into analog signals, And a multiplexer 14 for determining the positions of the two screens by the select signal SEL and multiplexing the video signals according to the first and second screens which are analog-converted, and outputting the multiplexed video signals reproducibly as two screens .

According to the two-screen reproduction processing apparatus of the video reproduction system having such components, the first ADC 2 converts the video signal according to the first screen on one side of the single screen in synchronization with the sampling clock CLK1, The first field memory 6 synchronizes with the sampling clock CLK1 and digitally converts the video signal according to the second screen on the other side of the single screen into the second ADC 4 in synchronization with the clock CLK2, And the second field memory 8 stores the image data according to the second screen in synchronization with the sampling clock CLK2. Accordingly, the first and second DACs 10 and 12 are supplied with the same clock pulse CLK3 and are synchronized, respectively, so that the images of the first and second screens from the first and second field memories 6 and 8 The multiplexer 14 selects the screen display position of the first and second screens by the select signal SEL so that the first and second DACs 10 and 12, Multiplexes the video signal according to the first and second screens from the first and second screens and outputs the multiplexed video signal so that two screens each of which is divided into left and right sides are formed on the screen screen.

However, in the two-picture reproduction processing apparatus of this video reproduction system, the first and second screens reproduced by being divided into left and right sides of a single screen having an aspect ratio of 640 x 480, i.e., 4: 3 or 16: 9, When a video signal according to the first and second screens has a screen mode of 4: 3 or 16: 9 per each frame, a part of the video screen to be reproduced It is impossible to move the image screen for viewing the remaining portion of the screen even if the screen is partially displayed, so that normal viewing of the two screens becomes impossible.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a video reproducing apparatus and a video reproducing method which are capable of performing position conversion of a video screen of one side at the time of executing a two- And to provide a screen position conversion apparatus for two-screen reproduction of the system.

It is another object of the present invention to provide a video playback system and a video playback system which are capable of performing a two-screen playback function, The present invention provides an apparatus for converting a screen position in a two-screen reproduction of a video reproduction system which enables simultaneous position shift to a video screen position.

According to a second aspect of the present invention, there is provided an apparatus for converting a screen position in a two-screen reproduction of a video reproduction system according to the first aspect of the present invention, First and second data conversion means for respectively sampling signals and converting them into digital data; and a control means for respectively supplying a read clock and a dummy set signal to the memory, respectively, First and second image memory means for reading image data of first and second screens memorized and memorized, image signals of first and second screens respectively read from the first and second image memory means, And a second data inverse transforming means for transforming and outputting the first and second data in accordance with the analog-converted first and second screens corresponding to the selected state of the screen display period by the input selection signal Image multiplexing means for performing multiplexing so that a width position of a screen display section with respect to a video signal is shifted; a readout clock is supplied to the first and second image memory means, and synchronous with the read clock, A pseudo signal generating means for generating a pseudo vertical synchronizing signal synchronously with the pseudo vertical synchronizing signal and supplying the same to the first and second image memory means, A function setting means for performing a key setting operation for moving a width position of a screen display section with respect to a video signal; a display means for displaying a read clock signal from the pseudo signal generating means, And control means for generating a selection control signal for a screen display section on the basis of a pseudo horizontal / vertical synchronizing signal, And a selection signal generating means for generating a selection signal corresponding to a screen display period of the width position to be shifted by the selection control signal from the control means in response to the signal, Device.

According to another aspect of the present invention, there is provided a screen position conversion apparatus for two-screen reproduction of a video reproduction system according to the second aspect of the present invention, First and second data conversion means for sampling each of the image signals according to the first and second image data and converting the digital image data into digital data; First and second image memory means for reading the image data of the first and second memories supplied and memorized, respectively, and image signals of the first and second images read from the first and second image memory means, respectively First and second data reverse conversion means for converting and outputting signals in the form of analog signals and for outputting the first and second data inversely corresponding to the selected state of the screen transition position by the input transition selection signal, Image multiplexing means for performing a multiplexing operation so that image signals corresponding to the first and second image memory means are shifted to different display positions; a second image memory means for supplying a read clock to the first and second image memory means, A pseudo signal generating means for generating a pseudo vertical synchronizing signal synchronously with the pseudo vertical synchronizing signal and supplying the same to the first and second image memory means, a first and a second screen A function setting means for performing a key setting operation for shifting the position of a screen display position with respect to a video signal of the display means by a key operation for shifting the screen display from the function setting means, Control means for generating a transition selection control signal for the first and second screens based on the horizontal / vertical synchronizing signal, A selection signal generating means for generating a selection signal for receiving a horizontal synchronizing signal to determine a width position for the first and second screens and a selection signal generating means for generating a selection signal from the selection signal generating means in response to a transition selection control signal from the control means, And a transition selection signal generating means for generating a transition selection signal for transiting the screen display positions of the first and second screens by converting a signal of the first screen and the second screen, .

According to the present invention configured as described above, in the case where two left and right screens are reproduced as the first screen and the second screen in the image reproducing system, So that the width positions of the first and second screens are shifted from each other and the display positions of the first screen and the second screen are mutually shifted in accordance with the selection operation state by the user.

1 is a block diagram showing a conventional two-screen reproduction processing apparatus of a video reproduction system,

FIG. 2 is a block diagram illustrating a screen position conversion apparatus for two-screen reproduction of a video playback system according to a first embodiment of the present invention. FIG.

3 is a timing chart for explaining a state of converting the reproduction positions of the first and second image screens according to the preferred embodiment of the present invention,

FIG. 4 is a diagram illustrating a mutual position conversion state between a first video screen and a second video screen according to a reproduction position conversion operation of the first and second video screens shown in FIG. 3;

FIG. 5 is a block diagram illustrating a screen position conversion apparatus for two-screen reproduction of a video playback system according to a second embodiment of the present invention.

FIG. 6 is a view illustrating a state in which left and right screen display positions of a first image screen and a second image screen are mutually changed according to a second embodiment of the present invention.

Description of the Related Art [0002]

20, 22: ADC, 24, 26: field memory,

28, 30: DAC, 32, 48: multiplexer,

34: clock generator, 36: N counter,

38: M counter, 39: L counter,

40: function setting section, 42: microcomputer,

44: Selection counter, 46: Inverter.

Hereinafter, a first embodiment of the present invention constructed as described above will be described in detail with reference to the accompanying drawings.

That is, FIG. 2 is a block diagram illustrating a screen position conversion apparatus for two-screen reproduction of the video reproduction system according to the first embodiment of the present invention. In the apparatus according to the first embodiment of the present invention, A first ADC for sampling and digitally converting a video signal of a first screen constituting one screen at the time of the reproducing function, 22 a sampling circuit for sampling the video signal of the second screen constituting the other screen at the time of the two screen reproducing function, Gt; ADC < / RTI >

Reference numeral 24 denotes a video decoder for receiving a recording clock signal WCLK1 and a recording reset signal WRST1 generated in synchronism with a synchronizing signal included in the video signal of the first screen, A read clock R CLK from a clock generator 34 and a read only set signal R RST from an L counter 39 to be described later are supplied to a memory 26 denotes a first field memory in which video data on the screen is read, 26 denotes a write clock signal (WCLK2) generated in synchronism with a sync signal included in the video signal of the second screen, and a write reset signal (WRST2) And receives the digital converted image signal of the second screen in units of fields and outputs a read clock signal R CLK from a clock generator 34 and a read only set signal from an L counter 39 R RST) is received and the image data of the second screen In the second field memory.

Reference numeral 28 denotes a first DAC for converting the image data according to the first screen from the first field memory 24 into an analog signal. Reference numeral 30 denotes a first field memory 2 < / RTI > that converts image data according to two screens into analog signal form.

Reference numeral 32 denotes a video input terminal for receiving a video signal of the first screen through the first DAC 28 via the first input terminal A and receiving the video signal of the first screen through the second input terminal B from the second DAC 30 And is switched and selected in response to the selection signal generated by the selection counter 44 to be described later, so that the video signal of the first screen and the video signal of the second screen And a multiplexer for shifting and multiplexing the width position of the screen display.

Reference numeral 34 denotes a clock generator for generating and supplying a read clock R CLK to the first and second field memories 24 and 26. Reference numeral 36 denotes a read clock R Counts M times (for example, 240 times) from the N counter 36, and N represents a count value of the pseudo horizontal synchronizing signal (H SYNC) And generates a pseudo vertical synchronizing signal (V SYNC) having a pulse period equal to, for example, three scanning periods (3H), and 39 denotes a pseudo vertical synchronizing signal (V SYNC) from the M counter And an L counter for counting times (for example, counting the pseudo horizontal synchronizing signal (V SYNC) having three scanning periods (3H) seven times) to generate a read-only set signal (R RST).

Reference numeral 40 denotes a matrix button provided on the control panel unit of the main body of the video reproducing system or a remote controller for remote control so that the width position of the first and second screens constituting the two screens The function setting unit (40) includes a mode setting key (40A) for setting a width position / movement mode of two screens, and a mode setting key (40A) for setting a screen display period for the first and second screens And a movement selection key 40B composed of an up / down key for performing a selection operation for changing the width position of the work W.

In addition, reference numeral 42 denotes a display device according to the two-screen width position shift mode by the function setting unit 44 in a state in which the pseudo horizontal / vertical synchronizing signal H SYNC / V SYNC and the read clock R CLK are supplied. And generates a selection control signal for controlling the width and position movement of the first and second screens in response to the selection operation for changing the width position of the screen display section W for the first and second screens.

A pseudo horizontal synchronizing signal (H SYNC) from the N counter 36 is supplied to the pseudo horizontal synchronizing signal H SYNC by a selection control signal from the microcomputer 42, And a selection counter for generating a selection signal having a changed screen display period W selected within a pulse period.

Next, an operation according to the first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, when a video signal of a first screen constituting one screen in two screens is sampled by the first ADC 20 and converted into digital data, the first field memory 24 stores the video signal included in the video signal of the first screen And a write reset signal W RST1 generated so as to be synchronized with the synchronous signal and stores the image data of the first screen and a read clock R generated from the clock generator 34 The first DAC 28 converts the read image data of the first screen into an analog signal and supplies the signal to the multiplexer 32. [

When the video signal of the second screen constituting the other screen is sampled by the second ADC 22 and converted into digital data in the two screens, the second field memory 26 is included in the video signal of the second screen (WCLK2) and a write reset signal (WRST2) generated so as to be synchronized with the synchronizing signal generated by the clock generator 34, R CLK), the second DAC 30 converts the image data of the second screen into an analog signal, and supplies the signal to the multiplexer 32.

At this time, the N counter 36 counts the read clock R CLK from the clock generator 34 N times as shown in FIG. 3 to generate a pseudo horizontal synchronizing signal H SYNC, The controller 38 counts the pseudo horizontal synchronizing signal H SYNC M times, for example, 240 times to generate a pseudo vertical synchronizing signal V SYNC having a pulse period of, for example, 3 scanning periods 3H, The controller 39 counts the pseudo vertical synchronizing signal V SYNC having the pulse period of L times, for example, 3 scanning periods 3H, seven times, for example, in the 21 scanning period 21H And generates a read-only set signal R RST having a period.

Accordingly, the first and second field memories 24 and 26 receive the read-only set signal R RST from the L counter 39 to perform the read operation on the video data of the first and second screens Is reset.

On the other hand, when the mode setting key 40A of the function setting unit 40 is operated to set the width and position movement mode for the first and second screens and the keys of the movement selection keys 40B are operated, The microcomputer 42 receives the pseudo horizontal / vertical synchronizing signal H SYNC / V SYNC and the reading clock R CLK in the case of performing the width position changing operation of the screen display section W for the second screen Recognizes the key operation state of the function setting unit 40 and displays the screen of the first and second screens on the basis of the count values of the pseudo horizontal / vertical synchronizing signal (H SYNC / V SYNC) and the read clock (R CLK) And generates a selection control signal for controlling the conversion of the width position with respect to the display section W. [

Accordingly, the selection counter 44 counts the selection control signal based on the pseudo horizontal synchronizing signal (H SYNC) supplied from the N counter 36, thereby generating the pseudo horizontal synchronizing signal H SYNC), and the multiplexer 32 receives the selection signal and selects and outputs the selection signal having the screen display interval W converted into the first and second screens Multiplexes the video signal so that the width position of the video signal is shifted, and outputs the multiplexed video signal.

Accordingly, the video signal according to the first and second screens output from the multiplexer 32 is shifted to the left or right while the screen display interval W is changed as shown in FIG.

Next, a second embodiment of the present invention constructed as described above will be described in detail with reference to the accompanying drawings.

That is, FIG. 5 is a block diagram showing a screen position conversion apparatus for two-screen reproduction of a video reproduction system according to a second embodiment of the present invention. In the apparatus according to the second embodiment shown in FIG. 1 and second ADCs 20 and 22 and first and second field memories 24 and 26, first and second DACs 28 and 30, a clock generator 34, an N counter 36, an M counter 38, the L counter 39, and the selection counter 44 are given the same reference numerals as the components of the apparatus according to the first embodiment shown in FIG. 2, and a detailed description thereof will be omitted .

It should be noted that the multiplexer 32 functioning according to the second embodiment of the present invention and the function setting unit 40, the microcomputer 42, the inverter 46 and the multiplexer 48 will be described in detail below do.

5, the function setting unit 40 includes a mode setting key 40A for setting a width position movement mode of two screens, a mode setting key 40A for setting a width position movement mode for two screens, And a movement selection key 40B composed of an up / down key for performing a selection operation for changing the width position of the section W. In addition to the constitution of the first embodiment, And a transition selection key 40C for performing a key operation for shifting the position to the position.

In addition, the microcomputer 42 generates a selection control signal for determining mutual width positions of the first and second screens according to the first embodiment of the present invention, and controls the transition of the function setting unit 40 A transition selection control signal for controlling the mutual position transition of the first screen according to the key operation of the selection key 40C and the left / right screen position of the second screen is generated.

In addition, the inverter 46 inverts the signal level of the selection signal determined by the selection counter 44 according to the width positions of the first and second screens.

The multiplexer 48 receives the selection signal from the selection counter 44 at its first input terminal A and receives the inverted selection signal from the inverter 46 through the second input terminal B, And a transition selection signal for switching the screen display position of the video signal of the first and second screens is selected by switching selected by the transition selection control signal from the microcomputer 42. [

The multiplexer 32 multiplexes the video signals of the first and second screens to be shifted to the left and right positions, respectively, by switching selected by the transition selection signal generated from the multiplexer 48.

Next, an operation according to a second embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, a video signal of a first screen constituting one screen on two screens is subjected to signal processing through the first ADC 20, the first field memory 24, and the first DAC 28, The video signal of the second screen is signal-processed through the second ADC 22, the second field memory 26 and the second DAC 30 and supplied to the multiplexer 32 respectively while the N counter 36 is read The counter 38 generates a pseudo vertical synchronizing signal V SYNC and the L counter 39 counts the clock R CLK to generate a pseudo horizontal synchronizing signal H SYNC, The selection counter 44 selects the screen display period for the width position of the first and second screens by the selection control signal of the microcomputer 42 by the key operation of the function setting unit 40 (See FIG. 3 according to the first embodiment) is determined, and the multiplexer 32 determines the screen display period W by the selection signal, and by performing the multi-pleasing operation A first screen is formed on the right side of the single screen and a second screen is formed on the left side as shown in FIG.

In this state, when the transition selection key 40C of the function setting unit 40 is operated to shift the screen display position of the first and second screens, the microcomputer 42 sets the key of the transition selection key 40C Recognizes the operation state and generates a transition selection control signal for controlling the screen display position transition of the first and second screens to the multiplexer 48. [

The multiplexer 48 receives the selection signal from the selection counter 44 through the first input terminal A and receives the selection signal from the selection counter 44 via the second input terminal B, Is switched and selected by the transition selection signal from the microcomputer (42) in a state of receiving the inverted selection signal from the inverted selection counter (44), and the screen display position for the video signal of the first and second screens is So that a transition selection signal for causing the transition to the position is generated.

Accordingly, the multiplexer 32 receives the transition selection signal from the multiplexer 48, multiplexes the video signals of the first and second screens by switching and selecting, and thereby multiplexes the video signals of the first and second screens, The first screen being positioned is shifted to the left to form the first-first screen, and the second screen positioned to the left of the single screen is shifted to the right to form the second-first screen.

According to the present invention as described above, the width positions of the first and second screens constituting the two screens can be mutually moved at the time of executing the two-screen reproducing function of the video reproducing system, As the screen display positions of the two screens can be mutually position-shifted, the playback positions of the two screens can be arbitrarily moved by the user's operation, thereby maximizing the viewing effect.

Claims (5)

First and second data conversion means (20, 22) for sampling and converting the video signals according to the first and second screens on one side and the other side of the two screens into digital data, The image data of the first and second digital converted images are supplied to the memory, and the read clock RCLK and the read only set signal RRST are received, The first and second image memory means (24, 26) First and second data inversion means (28, 28) for converting the video signals of the first and second screens read from the first and second video memory means (24, 26) 30), The multiplexing operation is performed such that the width position of the screen display section W with respect to the video signal according to the first and second screens is shifted corresponding to the selection state of the screen display section W by the input selection signal The multiplexing means 32, And supplies a read clock RCLK to the first and second image memory means 24 and 26 and synchronously supplies a pseudo horizontal / vertical sync signal H SYNC / V SYNC to the read clock R CLK, Pseudo signal generating means for generating a dummy set signal R RST synchronously with the pseudo vertical synchronizing signal V SYNC and supplying the same to the first and second image memory means 24 and 26, Function setting means (40) for performing a key setting operation for moving the width position of the screen display section with respect to the video signals of the first and second screens constituting the two screens, The read clock RCLK and the pseudo horizontal / vertical synchronizing signal H SYNC / V from the pseudo signal generating means are generated by a key operation for moving the width position with respect to the screen display section W of the function setting means 40. [ Control means (42) for generating a selection control signal for the screen display section (W) based on the control signal (SYNC) A pseudo horizontal synchronizing signal (H SYNC) from the pseudo signal generating means is supplied and a selection signal corresponding to a screen display section (W) of a width position to be moved is generated by a selection control signal from the control means And a selection signal generating means (44) for generating a selection signal for selecting one of the plurality of video signals. The semiconductor memory device according to claim 1, wherein the pseudo signal generating means comprises: a clock generator (34) for generating a clock for generating a read clock (R CLK) supplied to the first and second memory means (24, 26) A first counter 36 for counting the read clock R CLK from the clock generator 34 N times to generate a pseudo level signal H SYNC, A second counter 38 for counting the pseudo vertical synchronization signal V SYNC by counting M times and counting the pseudo vertical synchronization signal V SYNC from the second counter 38 by counting L times, And a third counter (39) for generating a null set signal (R RST). First and second data conversion means (20, 22) for sampling and converting the video signals according to the first and second screens on one side and the other side of the two screens into digital data, The image data of the first and second digital converted images are supplied to the memory, and the read clock RCLK and the read only set signal RRST are received, The first and second image memory means (24, 26) First and second data inversion means (28, 28) for converting the video signals of the first and second screens read from the first and second video memory means (24, 26) 30), Image multiplexing means 32 for multiplexing the video signals according to the analog-converted first and second screens to different display positions corresponding to the selected state of the screen transition position by the transition selection signal to be inputted, And supplies a read clock RCLK to the first and second image memory means 24 and 26 and synchronously supplies a pseudo horizontal / vertical sync signal H SYNC / V SYNC to the read clock R CLK, Pseudo signal generating means for generating a dummy set signal R RST synchronously with the pseudo vertical synchronizing signal V SYNC and supplying the same to the first and second image memory means 24 and 26, Function setting means (40) for performing a key setting operation for changing the position of the screen display position with respect to the video signal of the first and second screens constituting the two screens, On the basis of the read clock (RCLK) and the pseudo horizontal / vertical synchronizing signal (H SYNC / V SYNC) from the pseudo signal generating means by a key operation for shifting the screen display from the function setting means Control means (42) for generating a transition selection control signal for the first and second screens, A selection signal generating means (44) for receiving a pseudo horizontal synchronizing signal (H SYNC) from said pseudo signal generating means and generating a selection signal for determining a width position for said first and second screens, A selection signal from the selection signal generating means 44 is converted by a transition selection control signal from the control means 42 to generate a transition selection signal for causing the screen display positions of the first and second screens to transit to each other And a transition selection signal generating means for generating a transition selection signal in response to the selection signal. The semiconductor memory device according to claim 3, wherein the pseudo signal generating means comprises: a clock generator (34) for generating a clock for generating a read clock (R CLK) supplied to the first and second memory means (24, 26) A first counter 36 for counting the read clock R CLK from the clock generator 34 N times to generate a pseudo level signal H SYNC, A second counter 38 for counting the pseudo vertical synchronization signal V SYNC by counting M times and counting the pseudo vertical synchronization signal V SYNC from the second counter 38 by counting L times, And a third counter (39) for generating a null set signal (R RST). The apparatus according to claim 3, characterized in that the transition selection signal generating means comprises an inverter (46) for inverting the signal level of the selection signal from the selection signal generating means (44) Receives a selection signal from the generating means 44 and receives an inverted selection signal inverted through the inverter 46 through the second input terminal B and outputs the inverted selection signal to the transition selection control signal from the control means 42 And a multiplexer (48) for selecting and multiplexing a selection signal or an inversion selection signal to generate a transition selection signal.