JP2001083952A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the plotting speed of graphics in a switching of a image thinning the information of a graphic image to perform a simple display in the switching of the image, and shortening the time required or the display if the graphic image. SOLUTION: A simple display judgment part 113 judges whether a simple display is performed or not and gives notice of the display state to a memory I/F part 108, a simple display processing part 11, a display processing part 112 and a CPU. I/F part 110 on the basis of the control received from a remote control receiving part 109. The simple display processing part 11 reads a preliminarily prepared simple display data from an external memory 105 via the memory I/F part 108 on the basis of the instruction from the remote control receiving part 109 and performs a simple display processing according to the instruction from a CPU 115, and the display processing part 112 outputs the to an image output terminal 104. Since the data quantity to be accessed to the external memory 105 is reduced by the use the simple display data, the reading time can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the simultaneous display of a plurality of videos and graphics images, and more particularly to an image display device capable of rendering graphics images at high speed when redrawing a screen is required.

[0002]

2. Description of the Related Art In recent years, interactive services using a telephone line as a communication medium have been actively performed. As the interactive service, online shopping for purchasing a product at home, personal computer communication for exchanging information by character data, and the like are realized. In the future, when a movie or a TV program is requested, services such as video-on-demand that provide the selected program to individual recipients are scheduled.

[0003] In Japan, digital broadcasting is 2000
It will start in the year. In BS digital broadcasting,
It is possible to multiplex information with a plurality of standard quality video signals in one repeater of the satellite. In data broadcasting, which is the greatest feature of digital broadcasting, it is being studied to provide users with weather forecasts, news, and electronic program guides that can be viewed at any time. Furthermore, this data broadcast will utilize the size of the transfer capacity, and various services will be provided.

[0004] ISDB (Integrated Services Digital B)
Roadcasting) is a typical example, and comprises a plurality of moving images and complex graphics and presents them to the user.
In data broadcasting, the world standard MHEG5 (Multimedia a
nd Hypermedia InformationCoding Expert Group Part
5) Standards are adopted, and advanced graphics display is required for TV receivers as well as ISDB.

When displaying a plurality of moving images and complicated graphics simultaneously as shown in FIG. 7, for example,
It takes time to compress or decompress a plurality of moving images and draw more detailed graphics. That is, the user has to wait until all the displays are finished. Particularly in the case of a TV receiver, it is considered that the channel is frequently changed, but each time, the user has to wait until all the displays are completed, and a search cannot be freely and comfortably performed. Occurs.

[0006]

As described above, when simultaneously displaying a plurality of moving images and complicated graphics, it takes time to reduce the moving image and draw more detailed graphics. . This allows users to
When another operation such as a channel change is desired, it is necessary to wait until all the displays are completed, and a free and comfortable operating environment cannot be obtained.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an image display device that improves graphics drawing speed at the time of video switching.

[0008]

According to the present invention, in order to solve the above-mentioned problems, in an image display device capable of simultaneously displaying images on the same screen, information of the graphics image is displayed when the video is switched. By performing thinned-out simple display, the time required for displaying the graphics image is reduced.

According to the above-described means, when displaying a video or a graphics image simultaneously, the graphics drawing speed can be improved by simplifying the display of the graphics image when switching the video.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram for explaining a first embodiment of the present invention. In FIG. 1, reference numeral 100 denotes a graphic display unit, which includes a video input terminal 101, a remote control light receiving unit 10,
2. CPU (central processing unit) bus 103, video output terminal 104, memory bus 106 are provided as external I / F (interface), video input processing unit 107, memory I
/ F section 108, remote control receiving section 109, simple display determination section 113, CPU / I / F section 110, simple display processing section 11
1. It is composed of internal blocks of the display processing unit 112.

The graphics display unit 100 is controlled by a CPU 115 connected to a CPU bus 103,
The PU 115 accesses the inside of the graphics display unit 100 via the CPU / I / F unit 110. CPU11
The access from 5 is roughly divided into two types. One is read / write to the register of the internal block.
The other is read / write to the external memory 105 as a display memory via the memory I / F unit 108.

By the register access, each block is controlled, and the operation of the graphics display unit 100 is determined. The memory access is used to transfer graphics components such as icons and cursors used in a graphics menu provided to the user to the external memory 105.

The CPU / I / F unit 110 collects interrupt signals generated from each block, and
Output an interrupt signal to the The interrupt signal from each block is held in a register called a status register, and is used by the CPU 115 to know the content of the interrupt. The interrupt signal indicates a state inside the graphic display unit 100 such as a power on / off state, and is used when it is desired to notify the CPU 115 of the state.

On the other hand, a signal compressed by MPEG2 or the like is restored by an external MPEG2 decoder.
The restored digital video signal and data broadcast data are
The image is input to the image input processing unit 107 from the image input terminal 101. The video input processing unit 107 synchronizes with an internal clock and writes the data to the external memory 105 once via the memory I / F unit 108. The written data is
The image is read out by the display processing unit 112 and
Display on the monitor via 4.

In the display processing unit 112, the memory I / F unit 1
08 and the external memory 1 in accordance with the display synchronization signal.
05, the video signal is read. The read data is
The data is input to the CLUT converter 112a and the selector 112b. The CLUT conversion 112a is composed of a RAM,
This is a so-called palette memory. If the data stored in the external memory 105 is a pallet ID, CLUT
The color difference signals Y, Pr, Pb (4: 2:
Convert to 2). CLUT conversion 112 if it is a color difference signal
a so that the selector 112b is selected without passing through the
112a controls. Thereafter, the signal processing unit 112c performs processing such as interlace conversion and digital-to-analog conversion, and outputs the result to the video output terminal 104.

The memory I / F section 108 performs arbitration processing of memory access from each block, refresh processing of the external memory 105, and the like.

The remote control receiving section 109 receives the modulated infrared data transmitted from the remote control,
02, and decodes the data to determine control contents such as power on / off and channel change.
/ F unit 110 is notified.

The simple display determination section 113 is a block for determining whether or not to perform a simple display.
09, the display state is changed to the memory I / F unit 10
8, simple display processing unit 111, display processing unit 112 and C
The PU / I / F unit 110 is notified.

The simple display processing section 111 receives an instruction from the remote control receiving section 109, reads out simple display data prepared in advance from the external memory 105 via the memory I / F section 108, and executes a simple display data in accordance with an instruction from the CPU 115. The display processing unit 112 performs display processing and outputs the image data to the video output terminal 104. By using the simple display data, the amount of data accessing the external memory 105 is reduced, so that the read time can be reduced.

As shown in FIG. 2, a certain channel ("area information" (a)) is changed and a simple ("weather forecast"
The procedure for displaying in (b) will be described with reference to the flowchart in FIG.

In the remote control receiving unit 102, "area information"
Is changed to "weather forecast" from the selected channel (S101). The simple display determination unit 113 controls the CPU 11 to perform the simple display in response to the channel change.
5 and the simple display processing unit 113 indicate the state (S102).
In response to this, the simple display processing unit 113 reads the simple display data of “weather forecast” stored in the external memory in advance (S103). The read simplified display data is displayed via the display processing unit 112 (S10).
4). Then, it is determined whether or not a certain time has elapsed (S105). When the certain time has elapsed, the simple display data is changed to the detailed display data (S106).

At this time, the simple display data is not prepared in advance, and may be created when it is determined that the simple display is to be performed. As a method of creating the simplified display data, a method of reducing the color from the detailed display data, a method of changing the angle of view by sub-sampling, and the like can be considered.

Further, it is effective to prohibit the creation and display of the detailed display data when such simple display data is created and displayed. As a result, the memory and the display processing unit are used only for displaying the simplified display data, and the simplified display data can be promptly displayed to the user.

FIG. 4 shows the transition of the CPU calculation and display when such a channel change is performed to display simplified data.
This will be described with reference to FIG.

In the multi-display screen as shown in FIG. 4A, it is assumed that the upper right channel is changed from program A to program B. Then, the CPU 115 reads or creates the simplified display data of the program B. When the simple display data is ready, the display is a simple display of the program A to the program B. After a lapse of a predetermined time, the detailed display data of the program B is read out or created. When the detailed display data is ready, the display is the detailed display of the program B.

In addition, to change from the simple display to the detailed display,
It does not matter that the graphic display unit 100 does not judge that the predetermined time has elapsed, but that the user issues a change command to change from the simple display to the detailed display through the remote controller.

The simple display data display may be performed when the user operates the UP / DOWN button on the remote controller.

FIG. 5 is a block diagram for explaining a second embodiment of the present invention. The same components as those in FIG. 1 are described with the same reference numerals.

In this embodiment, the simple display determination unit 113
Sends information for simple display determination to the remote control receiving unit 10.
The information obtained from the information processed by the program information processing unit 201 is information on a receivable program such as an EPG instead of the information from No. 2.

The program information includes the title of the program, the start and end broadcast times, a brief introduction of the program, thumbnails, and the like. Thus, the state of the currently received program is determined, and it is determined whether or not the display should be simplified. For example,
Since there is a high possibility that the channel is changed near the start time or the end time of the program, the simple display data is displayed in advance in this time zone. At this time, the thumbnail transmitted as the program information may be displayed using the simplified display data.

The operation of FIG. 5 will be described with reference to the flowchart of FIG. The simplified display determination unit 113 obtains the status of the program currently being received from the program information processing unit 201, and determines whether or not this status is near the start or end time (S201). If it is near the start or end time, the status is indicated from the simple display determination unit 113 to the CPU 115 and the simple display processing unit 113 (S102). In response to this, the simplified display processing unit 112
5 is read out (S10).
3). The read simplified display data is transmitted to the display processing unit 11.
2 is displayed (S104). Then, it is determined whether or not a certain time has elapsed (S105). When the certain time has elapsed, the simple display data is changed to the detailed display data (S106).

At this time, the program is changed between 0 minute and 3 minutes.
It is considered that there are many 0 minutes, and the frequency at which the user changes the channel is also considered to be high in this time zone. Therefore, without using the program information processing unit 201, the data at the time of simple display is always used around 0 minutes and 30 minutes. The configuration may be changed.
Of course, this time zone may be set by the user.

[0033]

As described above, the image display device according to the present invention has a simplified display of graphics images when switching between videos when displaying a plurality of videos and graphics images simultaneously. In addition, the graphics drawing speed at the time of video switching can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram for explaining a first embodiment of the present invention.

FIG. 2 is an explanatory diagram for describing an example in which a plurality of images including a graphics image are simultaneously displayed.

FIG. 3 is a flowchart for explaining the operation of FIG. 1;

FIG. 4 is an explanatory diagram for describing transition of CPU calculation and display when performing simplified data display by changing channels.

FIG. 5 is a block diagram for explaining a second embodiment of the present invention.

FIG. 6 is a flowchart for explaining the operation of FIG. 5;

FIG. 7 is an explanatory diagram for describing an example in which a plurality of conventional moving images and complicated graphics are simultaneously displayed.

[Explanation of symbols]

100: graphic display unit, 101: video input terminal,
102: remote control light receiving unit, 103: CPU bus, 104
... video output terminal, 105 ... external memory, 106 ... memory bus, 107 ... video input processing unit, 108 ... memory I / F
Unit, 109: Remote control receiving unit, 110: CPU / I / F
Unit, 111: simple display processing unit, 112: display processing unit, 1
13: Simple display determination unit, 115: CPU, 201: Program information processing unit.

 ──────────────────────────────────────────────────の Continued on the front page F term (reference) 5C025 AA30 CA02 CB10 DA05 5C082 AA02 AA21 AA37 BA12 BA27 BA41 BB03 BB51 BC07 CA34 CA55 CA76 CA81 CB01 CB05 DA71 DA86 MM02

Claims (6)

[Claims] An image display device capable of simultaneously displaying a video and a graphics image on the same screen, wherein a simple display in which information of the graphics image is thinned out is performed when the video is switched. An image display device for reducing the time required for drawing the graphics image. 2. The image display device according to claim 1, wherein the switching of the video is performed near a start or end time zone of the program. 3. The graphics display method according to claim 1, wherein the simple display uses data for simple display prepared in advance and displays the data. 4. The image display device according to claim 1, wherein the simple display is switched to detailed graphics after a lapse of a predetermined time. 5. The image display device according to claim 4, wherein the predetermined time elapses when a user performs a switching operation for switching to a detailed image display. 6. The image display apparatus according to claim 1, wherein calculation for a detailed image display is stopped during a predetermined time during which the simple graphics are displayed.