JP2561823Y2 - Television receiver - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver which displays pictographs (hereinafter referred to as icons) corresponding to a plurality of operation functions on a CRT screen.

[0002]

2. Description of the Related Art Normally, a television receiver is operated by a remote control transmitter. In addition, the remote control transmitter has operation keys corresponding to the number of functions, so that the size of the remote control transmitter cannot be avoided.

In order to solve this drawback, there has been proposed a method of displaying an icon corresponding to an operation key on a screen, selecting the icon with a cursor, and performing key input. According to this method, the operation keys of the remote control transmitter need only be the cursor movement key and the enter key.

[0004]

However, when an icon is displayed on a screen, there is a drawback that a part of the image disappears when the icon is displayed over the video signal.

In order to solve this drawback, it is only necessary to reduce and display the image only at the portion where the icons overlap, but at the time of reduction, it is necessary to thin out the image signal and the image quality deteriorates.

[0006] The present invention is to solve the above disadvantages,
An object of the present invention is to provide a television receiver capable of displaying an icon without missing a part of an image and without deteriorating image quality.

[0007]

A television receiver according to the present invention displays a plurality of icons corresponding to a plurality of operation functions on a CRT screen, and executes an operation by selecting the icon. An icon generation circuit for generating a video signal representing the icon,
An icon synthesizing circuit for synthesizing the television signal and the video signal representing the icon such that the video signal representing the icon is superimposed on the pedestal portion of the television signal; and a deflection supplying a deflection current to a deflection coil of the CRT. A control circuit for controlling the amplitude and bias of the deflection current, wherein the control circuit reduces the amplitude of the deflection current and adjusts the bias of the deflection current when displaying the icon. And display television images and icons on the screen.

[0008]

According to the present invention, since the amplitude of the deflection current is controlled to be small when an icon is displayed on the screen, the screen is reduced and displayed without being thinned.
On the other hand, as the image is reduced, an icon is displayed in an overscan portion that should appear on the conventional screen. In addition, since the bias of the deflection current is adjusted, the center position of the image when displaying the icon can be appropriately controlled.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

First, the operation principle of the present invention will be described. FIG. 1 is a diagram illustrating a relationship between a screen and a television signal, and FIG. 1A illustrates a relationship during a normal display. Reference numeral 6 denotes an area displayed on the CRT screen in the scanning portion.
Indicates an overscan portion of the scan portion that does not appear on the CRT screen. This overscan portion corresponds to the pedestal portion of the video signal, and exists on the upper, lower, left, and right sides of the screen.
The relationship at the time of display is shown. An icon signal representing an operation key is superimposed on a pedestal portion of the video signal. The operation key 8 based on the icon signal is displayed at a predetermined width on the lower side and the right side on the screen. Therefore, an overscan portion does not occur in this portion and exists only on the left side and the upper side of the screen.

The image appearing on the CRT screen is slightly reduced. However, at this time, since the amplitude of the deflection current flowing through the deflection coil is controlled to be small, the number of scanning lines appearing on the screen does not change. Therefore, the image quality does not deteriorate at all.

FIG. 2 is a schematic block diagram of the apparatus according to the present embodiment. 1 is an icon generating circuit for generating a video signal representing an icon (hereinafter referred to as an icon signal), and 2 is a pedestal portion of a television signal. An icon synthesizing circuit for synthesizing the television signal and the icon signal so that the icon signal is superimposed thereon, and specifically includes a frame memory. Reference numeral 3 denotes a control circuit which outputs an instruction to the icon synthesizing circuit 2 when displaying an icon and controls the deflection circuit 4 to supply the amplitude and bias of a deflection current supplied to a deflection coil (not shown) in the CRT 5. To change. As a result, overscan portions on the lower and right sides of the screen appear on the screen, and icons are displayed on these portions.

FIG. 3 is a specific block diagram of the deflection circuit. The vertical synchronization signal and the horizontal synchronization signal separated by the synchronization separation circuit 41 are supplied to a vertical oscillation circuit 42 oscillating at about 60 Hz and a horizontal oscillation circuit 43 oscillating at 15.75 kHz, respectively. The output of the vertical oscillation circuit 42 and the output of the horizontal oscillation circuit 43 are adjusted by the vertical output circuit 44 and the horizontal output circuit 45, respectively, after the bias adjustment and the amplitude adjustment of the deflection current are performed.
H. Here, when there is an instruction to display an icon from the control circuit 3, control is performed so as to reduce the amplitude of the deflection current in the vertical output circuit 44 and the horizontal output circuit 45. Also, as shown in FIG. 1, the center position of the image is shifted with the icon display, so that the bias adjustment is also performed.

If the center of the screen is corrected by shifting the reading position of the frame memory of the icon synthesizing circuit 2, it is not necessary to adjust the bias of the deflection circuit.

[0015]

According to the present invention, as described above, the operation keys using icons can be displayed on the screen without any loss of the image and without deteriorating the image quality.
In addition, by controlling the amplitude and bias of the deflection current, an icon can be displayed in an overscan portion that should appear on a conventional screen as the image is reduced, and the center position of the image at that time can be appropriately controlled.

[Brief description of the drawings]

FIG. 1 is a schematic view showing the principle of the present invention.

FIG. 2 is a schematic block diagram of a television receiver in the embodiment.

FIG. 3 is a schematic block diagram of a deflection circuit in the present embodiment.

[Description of Signs] 1 Icon generation circuit 2 Icon composition circuit 3 Control circuit 4 Deflection circuit

Claims (1)

(57) [Scope of request for utility model registration] 1. A television receiver which displays a plurality of icons corresponding to a plurality of operation functions on a CRT screen and executes an operation by selecting the icon, generates a video signal representing the icon. An icon generating circuit; an icon synthesizing circuit for synthesizing the television signal and the video signal representing the icon such that the video signal representing the icon is superimposed on a pedestal portion of the television signal; and a deflection coil of the CRT. A deflection circuit that supplies a current, and a control circuit that controls an amplitude and a bias of the deflection current, wherein the control circuit displays the icon when the icon is displayed.
While reducing the amplitude of the deflection current, the deflection current
A television receiver that adjusts the angle and displays television images and icons on the screen.