JP2000209515A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image display device where no undesired information is displayed on a circumferential part of a screen of a video device through simple signal processing. SOLUTION: The image display device where a video signal processing circuit 5 receiving a video signal conducts signal processing on the basis of a synchronizing signal included in the video signal so as to display an image and information on a screen 7a of a video device 1, is provided with a display control means 8 that receives the synchronizing signal of the video signal and outputs a display command signal denoting a change of color of an edge of a picture displayed on the screen 7a into an achromatic color or an optional color to the video signal processing circuit 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device such as a television receiver having a cathode ray tube or a liquid crystal display screen, and more particularly to an image display device in which information other than an image is not displayed on an edge of a screen of various video equipment. The present invention relates to an image display device capable of performing processing.

[0002]

2. Description of the Related Art In recent years, a television receiver (TV) of a type capable of changing the size of an image displayed on a screen has become widespread. As an example of this, there has been proposed an image signal display method and a display device for displaying images of various genres at an optimal size on a large screen display (see Japanese Patent Application Laid-Open No. 10-108108). In this apparatus, a display mode for displaying an image on a display screen is provided in a plurality of different sizes, and one of the display modes is selected according to the genre of the image.
Means for selecting one of the modes, and flexible window means for displaying an image of an image signal on a display screen with a display screen size defined by the mode selected by the selecting means. According to this display device, personal computer images can be displayed on a small screen, news and games can be displayed on a medium screen, and entertainment images can be displayed on a large screen according to the genre of images.

[0003]

By the way, video equipment, such as a TV, which receives a radio wave from a broadcasting station, has information such as characters and telops at an edge of an image displayed on its screen, especially at an upper edge. Is displayed. For example, a widespread T using a CRT held in a cabinet as a picture tube
In V, when a signal from the tuner is input to the video signal processing circuit, when the maximum screen size of the CRT is 100%, an image is displayed in an area of 85% to 95% based on 90%. Signal processing for displaying the character information or the like outside the area is performed. Therefore, when an image is displayed in a narrow area of 85%, which is the lower limit of the display, a state occurs in which some characters, telops, and the like are displayed on the screen. If such character information is displayed at the top of the screen or the like regardless of the display image, it is extremely disturbing and makes it difficult to view the broadcast program. Therefore, conventionally, a size coil was added to the deflection circuit so that it would not be displayed on the screen. However, the circuit configuration becomes complicated, the number of manufacturing steps increases, and the cost of manufacturing the TV increases because the coil is expensive. There were difficulties.

[0004] In addition, since the conventional display device can change the display screen size, it is possible to prevent unnecessary character information and the like from being displayed on the screen of the TV. Since it is realized by controlling the deflection system signal of the display unit or operating the image compression by signal processing, the configuration of these deflection control circuits or signal compression processing circuits is considerably complicated. Therefore, when this display device is used in a TV, there remains a problem that the production becomes more complicated and the production cost becomes more expensive.

The present invention has been made in view of the above problems, and has as its object to provide an image display apparatus that does not display unnecessary information on the edge of the screen of a video device by simple signal processing.

[0006]

According to a first aspect of the present invention, there is provided a video signal processing circuit in which a video signal is introduced. In an image display device that performs image processing based on signal processing and displays images and information on a screen of a video device, a synchronization signal of the video signal is guided, and when the synchronization signal is input, the video signal processing circuit displays the video signal on the screen. A display control means for outputting a display command signal for changing the edge of the displayed image to a colorless or arbitrary color is provided. Also, in the invention according to claim 2, the video signal processing circuit receives the display command signal, and sets a black level signal in several lines before and after the vertical synchronizing signal for one image scan, and the other lines. Is characterized in that signal processing for setting a black level before and after the horizontal synchronization signal is performed. The invention according to claim 3 is characterized in that the video equipment is a CRT television receiver. The invention according to claim 4 is characterized in that the video equipment is a television receiver having a liquid crystal display device.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an electric block diagram showing an image display device according to the present invention, and FIG.
It is a front view of the television receiver provided with the image display device. This image display device is applied to a popular type cathode ray tube television receiver (TV) 1.
The control unit 8 processes the video signal sent from the Y / C / A separation circuit 3 to which the received signal of the tuner 2 is guided to the video signal processing circuit 5, so that the image displayed on the screen 7 a of the CRT 7 is processed. Unnecessary information is not displayed on the edge.

A radio wave received by an antenna of the TV 1 is guided to a tuner 2 of a receiving circuit, and a signal of a selected channel is given to a Y / C / A separating circuit 3. This Y
The audio signal processing circuit 4, the video signal processing circuit 5, and the control unit 8 are connected to the / C / A separation circuit 3. This Y
The / C / A separation circuit 3 separates an input signal from the tuner 2 and sends a composite signal including a luminance signal (Y), a carrier signal (C), and a synchronization signal of the video signal to the video signal processing circuit 5 side. On the other hand, the audio signal (A) is sent to the audio signal processing circuit 4. Further, a video signal including a synchronization signal is also supplied to the control unit 8 side. Note that the audio signal processing circuit 4 uses a stereo IC, and sends out an audio signal extracted according to a command signal from the control unit 8 to a pair of stereo speakers (not shown).

The video signal processing circuit 5 comprises a chroma IC, and includes a color signal output circuit, a sync separation circuit, and the like. This video signal processing circuit 5 has a CR
While connected directly to T7, the CRT
7, and the output signal of the control unit 8 is guided. The color signal output circuit amplifies the R, G, and B primary color signals generated by matrixing the luminance signal (Y) and the color difference signal, and supplies the amplified signals to the cathode of the CRT 7. This color signal is a signal obtained by adding a carrier signal to a luminance signal, synthesizing horizontal and vertical synchronization signals, and further adding a color burst (color synchronization signal).

In the present embodiment, the video signal input from the Y / C / A separation circuit 3 is transmitted to the OSD (ON
(SCREEN DISPLAY) signal, when scanning one image displayed on the screen 7a of the CRT 7, all lines before and after the vertical synchronizing signal are set to black level signals, and the other lines are set to black level before and after the horizontal synchronizing signal. And transmits the signal to the CRT 7 side. The synchronization separation circuit amplifies and separates the synchronization signal from the video signal and sends out a horizontal synchronization signal and a vertical synchronization signal to the deflection circuit 6. The deflection circuit 6 sends a horizontal drive signal and a vertical drive signal to the CRT 7 side.

The control unit 8 includes a CPU, a ROM, and a RAM.
A microcomputer comprising: Y / C /
In addition to the A separation circuit 3, the audio signal processing circuit 4, the video signal processing circuit 5, etc., they are connected unidirectionally or bidirectionally according to the circuit components (not shown) and their functions. This control unit 8
Controls the operation of the entire TV, executes control to display an image and various information on the screen 7a of the CRT 7, and sends an OSD signal for changing the edge of the displayed image to black to the video signal processing circuit 5 side. Configuration.
In this display control, when a video signal is input from the Y / C / A separation circuit 3 to the control unit 8, a display control signal is sent to the video signal processing circuit 5, and the maximum size of the screen 7a of the CRT 7 is set to 100%. Sometimes, an image is displayed in a 95% area, and character information is displayed on the upper edge side of the image.

Normally, the CR held in the cabinet 11
At T7, when the dotted line A in FIG. 2 is the maximum size, the image is displayed in a range of about 5% before and after the maximum size, with 90% of the area indicated by the solid line C as a reference for image display. (The solid line B in FIG. 9 indicates the upper limit of image display.
5% region, two-dot chain line D indicates the lower limit of image display 85%
Area). In such display control, the character information is also displayed according to the upper and lower limits of the image display. Therefore, when an image is displayed in an area of 85%, the screen 7a which is the inner periphery of the front frame 11a of the cabinet 11 is displayed. A state occurs in which character information is projected on the outer peripheral portion of. For this reason, in this example, when the synchronization signal of the video signal is input to the control unit 8, the CRT 7
Is controlled to display an image in a 95% area on the screen 7a, and during the image display, the edges of the image are set to black equal to the background color so that part of the character information is not displayed on the screen 7a. Perform signal processing.

In the signal processing of the black display, an OSD signal is sent from the control unit 8 to the video signal processing circuit 5 in synchronization with a color broadcast video signal input to the video signal processing circuit 5, and is sent to the color signal output circuit. To the composite color signal. In other words, in the scanning of one image displayed on the screen 7a of the CRT 7, the vertical synchronizing signal is inserted into the scanning from the upper part 7b to the lower part 7c of the screen 7a, and this color signal is continuous from the previous image. Between the post-stage and pre-stage of the sync signal,
Horizontal synchronization signals corresponding to a predetermined number of lines are inserted. Therefore, regarding the color signal transmitted to the CRT 7, the scanning sections Ss, Se of the upper and lower portions 7b, 7c of the screen 7a are scanned.
The black level is inserted into each of several lines on the subsequent and preceding stages of the vertical synchronization signal. Then, the line is cut by 1H between the horizontal synchronizing signals S, S as shown by the waveforms Ps, Pe in FIGS. V is a color burst signal. Further, the scanning section S shown in FIG.
For a plurality of lines corresponding to the scanning section Sn other than s and Se, as shown in FIG. 3B, signal processing for setting each waveform P to a black level only for P1 and Pn before and after each horizontal synchronization signal S, S is performed. Do.

As a result, when an image is displayed on the screen 7a in an area of the upper limit of 95%, as shown by the oblique line E in FIG. 2, a narrow black color is applied to the edge of the display image overlapping the inner peripheral edge of the front frame 11a. Is displayed. The width of the black color can be adjusted by an OSD signal sent from the control unit 8 to the video signal processing circuit 5. As described above, when a narrow black color is displayed at the edge of the display image, information such as obstructive characters and telops is covered with black and is not displayed at the edge, and the image being displayed becomes easy to see. Further, when the cabinet 11 is black like a general TV 1, a black edge is displayed on the image, so that the viewer does not feel uncomfortable. In the above-described embodiment, the edge of the image is changed to black, but the signal processing for changing the color to colorless, gray, or another color in accordance with the color of the cabinet 11, which is widely used, is performed. Is also good. Also, CR as a video device
The example of application to the TV 1 having the T7 has been described.
The effect can be obtained.

[0015]

As described above, according to the first aspect of the present invention, when a synchronization signal included in a video signal is input, the display control means sends a display command signal to the video signal processing circuit. Since the image is transmitted and the color of the edge of the display image is changed to colorless or an arbitrary color, unnecessary information which has conventionally been annoying is no longer displayed on the periphery of the screen, and the image is easily viewed. Further, since the discoloration of the edge of the image can be realized only by the signal processing, there is no need to provide a special electric circuit, and there is also an effect that a video apparatus having a simple configuration and a low price can be provided. According to a second aspect of the present invention, in the video signal processing circuit, all the lines before and after the vertical synchronizing signal are black level signals for the scanning of one image, and the other lines are before and after the horizontal synchronizing signal. Is performed, black is displayed at the edge of the display image,
This is equivalent to the background color widely used by video equipment, and has the advantage of avoiding the problem of giving the viewer a sense of discomfort. Further, the invention according to claim 3 has the advantage that colorless or arbitrary color is displayed on the peripheral portion of the screen of the CRT television receiver, unnecessary information is not displayed, and the image is easy to see. According to the fourth aspect of the invention, colorless or arbitrary color is displayed on a peripheral portion of a liquid crystal screen of a television receiver provided with a liquid crystal display device, unnecessary information is not displayed, and an image is easily viewed. There are advantages.

[Brief description of the drawings]

FIG. 1 is an electrical block diagram showing a schematic configuration of an image display device according to the present invention.

FIG. 2 is an explanatory diagram showing a size of an image displayed on a screen of a television receiver.

FIG. 3 is a waveform chart of a video signal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Video equipment (TV) 5 Video signal processing circuit 7a Screen 8 Display control means

Claims (4)

[Claims] 1. An image display device in which a video signal processing circuit into which a video signal is introduced performs signal processing based on a synchronization signal included in the video signal to display images and information on a screen of a video device. A display control signal for guiding a synchronization signal of the signal and outputting a display command signal for changing an edge of an image displayed on the screen to a colorless or arbitrary color to the video signal processing circuit when the synchronization signal is input; An image display device comprising means. 2. The video signal processing circuit receives the display command signal and sets a black level signal in several lines before and after a vertical synchronizing signal for one image scan, and in other lines before and after a horizontal synchronizing signal in other lines. 2. The image display device according to claim 1, wherein signal processing is performed to set a black level. 3. The image display device according to claim 1, wherein the video device is a CRT television receiver. 4. The image display device according to claim 1, wherein the video device is a television receiver provided with a liquid crystal display device.