JPH06261263A - Multi-screen display method - Google Patents

Abstract

PURPOSE:To display a slave screen of desired size in a desired position on a master screen by generating the slave screen of desired size, based on a video signal inputted in accordance with a given instruction, and arranging and displaying it in the master screen. CONSTITUTION:A control part 7 supplies an operation timing signal outputted from a timing generating part 8 to each frame memory 3-5 and a signal switching part 6, based on an instruction 15 of size and a display position of a supplied display screen. Also, data of size and a display position of an instructed display screen is stored in a memory 9, and based on the data of size and a display position of the display screen, an address of read-out and write to each frame memory 3-5 is calculated by an arithmetic part 10. According to this constitution, in accordance with size and a display position of the instructed display, a screen of desired size is generated, based on inputted video signals 13, 14, and the generated screen can be arranged and displayed in one display screen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-screen display method in which a plurality of input video signals are freely arranged and displayed on one screen according to given instructions.

[0002]

2. Description of the Related Art Conventionally, in a television utilizing digital signal processing such as clear vision, for example, a plurality of video signals such as a home video screen and a television screen are Pin to P
An example of displaying on a (parent-child screen) is known. FIG. 4 is a display example of a parent-child screen by P in P in the conventional clear vision. A clear-vision display screen 40 displays, for example, a television image on the main screen 41, and simultaneously displays a home video image on the 1/9 sub-screen 42. However, in P in P, the size of the child screen 42 is determined to be one-ninth or one-fourth of the parent screen as in the above example, and the display position is, for example, nine-ninths. In the case of the first sub-screen 42, the clear-vision display screen 40 is determined to be selected from nine display positions that are divided into three parts vertically and horizontally, and the size of the sub-screen is set to a desired size. It was not possible to freely set the screen display position.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and generates an image of a desired size based on an input video signal in accordance with an instructed display size and a display position. However, it is an object of the present invention to provide a multi-screen display method in which the generated screen is freely arranged and displayed within one display screen.

[0004]

In order to achieve the above object, at least one scan converter for converting a scanning frequency of an input video signal into a predetermined scanning frequency and an input video signal for storing a predetermined timing signal. A first frame memory for reading out the video signal, thinning out scanning lines from the video signal at a predetermined ratio and thinning out horizontal pixels at a predetermined ratio, and storing the video signal; A second and subsequent frame memories cascade-connected to one scan converter, and a video signal supplied from the first frame memory, the second frame memory, etc. are switched based on a predetermined timing signal, and a parent screen and a child screen are combined. A signal switching unit for outputting the generated video signal, the first frame memory and the second frame memory, and signals Based on a timing signal generation unit that generates an operation timing signal to be supplied to the replacement unit, a memory that stores the size and position data of the instructed child screen display, and an instruction of the size and position of the child screen display. It is composed of an arithmetic unit for calculating an address for reading or writing the frame memory and a control unit for controlling each unit.

[0005]

With the above configuration, the scan converter adjusts the scanning frequency of the input video signal to the predetermined scanning frequency. Further, the control unit thins out the scanning line data at a predetermined ratio from the stored scanning line data at a predetermined operation timing from each frame memory, for example, a video signal to be used as a child screen, and also obtains the pixel data of each scanning line. The video signal obtained by thinning out at a predetermined ratio is input to the signal switching unit, and then selectively switched at a predetermined timing of the parent screen to generate and output a video signal in which the parent screen and the child screen are combined. Further, the control unit supplies the operation timing signal output from the timing generation unit to each frame memory and the signal switching unit based on the supplied display screen size and display position instruction, and at the same time, specifies the display screen size. And store the data of the display position in the memory,
Further, control is performed such that the arithmetic unit calculates the read and write addresses for each frame memory based on the size and display position data of the display screen.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A multi-screen display method according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a conceptual block diagram for implementing the multi-screen display method according to the present invention. Reference numeral 1 denotes a first scan converter which inputs a composite video signal 13 output from a home video or the like and performs scan line conversion (up conversion) to a high-definition (parent screen) scan frequency. Reference numeral 2 is a second scan converter for inputting the composite video signal 14 of the personal computer after the level conversion and converting the scanning line into the scanning frequency of high definition. 3 receives and stores the high-definition video signal 12 output from the MUSE decoder, and appropriately reads the stored high-definition video signal 12 at a predetermined timing signal, thins out the scanning lines from the video signal at a predetermined ratio, and sets horizontal pixels. It is a first frame memory which generates a video signal thinned out at a predetermined ratio and stores the video signal. Reference numeral 4 denotes a second frame memory that stores the video signal output from the first scan converter 1 and that operates similarly to the first frame memory 3. Reference numeral 5 is a third frame memory that stores the video signal output from the second scan converter 2 and that operates in the same manner as the first frame memory 3. Reference numeral 6 is a video signal in which a predetermined video signal is supplied from each of the first frame memory 3, the second frame memory 4 and the third frame memory 5, and these are appropriately switched, and a main screen and a child screen are combined. 16 is a signal switching unit for generating 16. Reference numeral 7 is a control unit that supplies operation timing signals to the first frame memory 3, the second frame memory 4, the third frame memory 5, and the signal switching unit 6 and controls each unit. Reference numeral 8 denotes a timing generator that generates an operation timing signal based on the supplied display screen size and display position instruction. Reference numeral 9 denotes a memory that stores the size and display position data of the designated display screen. Reference numeral 10 is an arithmetic unit for calculating read and write addresses for each frame memory.

The operation of the multi-screen display method according to the present invention will be described. FIG. 2 is a diagram showing a display position of a child screen of the multi-screen display method according to the present invention. Reference numeral 20 is a high-definition display screen that displays a parent screen 21 and a child screen 23 that is fitted into the parent screen 21 and displayed. Reference numeral 24 is a horizontal scanning period that passes through the sub-screen 23, and Ah and Bh represent start and end positions of the sub-screen 23 in the horizontal scanning direction.
Reference numeral 25 is a vertical scanning period that passes through the child screen 23, and Av and Bv represent the start position and the end position of the child screen 23 in the vertical scanning direction.

FIG. 3 is a thinning (a) diagram of pixel data and a thinning (b) of scanning lines in the multi-screen display method according to the present invention.
It is a conceptual explanatory drawing which reduces the size of the small screen by a figure.
30 is a data position chart for the horizontal scanning period, and 33
Is a data position chart of the vertical scanning period. For example,
When the horizontal size of the small screen is ½ of the entire display period, only the odd-numbered position data is set as the start timing at the Ah position of the horizontal scanning period, and the thinned-out odd-numbered pixel data is shown in the chart 31. To read. Also, if the vertical size of the sub-screen is half the total display period,
Only the odd-numbered position data is read out as shown in the chart 34 by using the Av position of the vertical scanning period as the start timing and thinning out the odd-numbered scanning line data.

[0009]

As described above, according to the present invention, an image of a desired size is generated based on an input video signal in accordance with an instructed display size and a display position, and is displayed on one display screen. A multi-screen display method for freely arranging and displaying the generated screens is provided. Therefore, it is possible to freely display various video screens input in one screen, for example, a clear vision screen can be reduced to fit and displayed on a high-definition screen, and a personal computer screen can be fit and displayed.

[Brief description of drawings]

FIG. 1 is a conceptual block diagram for implementing a multi-screen display method according to the present invention.

FIG. 2 is a diagram showing a display position of a child screen of a multi-screen display method according to the present invention.

FIG. 3 is a conceptual explanatory diagram for reducing the size of a child screen by a pixel data thinning (a) diagram and a scanning line thinning (b) diagram in the multi-screen display method according to the present invention.

FIG. 4 is a display example of a parent-child screen by P in P in the conventional clear vision.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st scan converter 2 2nd scan converter 3 1st frame memory 4 2nd frame memory 5 3rd frame memory 6 Signal switching section 7 Control section 8 Timing generation section 9 Memory 10 Computing section 12 High-definition video signal 13 Composite video signal 14 PC composite video signal 15 Display screen size and display position instruction 16 Composite video signal 20 High-definition display screen 21 Parent screen 23 Sub-screen 24 Horizontal scanning period 25 Vertical scanning period 30 Vertical scanning period 30 Data position chart 31 Thinned pixel data chart 33 Vertical scanning period data position chart 34 Thinned scan line data chart 40 Clear vision display screen 41 Parent screen 42 1/9 child screen

Claims (2)

[Claims] 1. At least one scan converter for converting a scanning frequency of an input video signal into a predetermined scanning frequency, an input video signal is stored, the video signal is read at a predetermined timing signal, and a predetermined ratio is obtained from the video signal. A first frame memory for generating a video signal in which scanning lines are thinned out and horizontal pixels are thinned out at a predetermined ratio, and the video signal is stored; and second and subsequent frames cascade-connected to the at least one scan converter. A memory, a signal switching unit for switching a video signal supplied from the first frame memory, the second frame memory or the like based on a predetermined timing signal, and outputting a composite video signal of a parent screen and a child screen, Generates operation timing signals to be supplied to the first frame memory, the second frame memory, etc. and the signal switching unit. And a memory for storing data of the size and position of the instructed small screen display, and an address for reading or writing the frame memory based on the instruction of the size and position of the small screen display. It consists of a calculation unit and a control unit that controls each unit, and according to the given instructions, at the corresponding display position on the main screen,
A multi-screen display method in which a sub-screen generated in a desired size is fitted and displayed simultaneously. 2. The multi-screen display method according to claim 1, wherein a plurality of child screens each having a desired size are fitted into each of the designated positions of the parent screen and displayed simultaneously.