JPH0865702A - Sync signal controller - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to always output a display screen in synchronization with each other and to improve the efficiency of work in factory adjustment and market adjustment. A sync separation circuit 1 for separating a video signal and a sync signal from an input signal, an internal sync generation circuit 7 for generating a sync signal inside the OSD circuit, and a sync detection means 3 for detecting the sync signal from the input signal, If the sync signal is detected, the sync signal separated from the input signal by the sync separation circuit 1 is used. If the sync signal is not detected, the OS is used.
The synchronous switching control means 4 for deciding and switching to use the synchronous signal generated inside the D circuit is provided, and even when the synchronous signal cannot be obtained because the channel not including the video signal is selected, it is always provided. Output of synchronized display screen can be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver and a high-definition television receiver.

[0002]

2. Description of the Related Art Television receivers that are currently in widespread use include display of the currently selected channel, adjustment of a video menu,
It holds various functions such as adjusting the voice menu, but most of them are realized by screen display. Here, a basic configuration for displaying a screen on the television receiver will be described with reference to FIG.

In FIG. 2, a sync separation circuit 1 separates a video signal and a sync signal from an input signal, and a display data setting means 8 in the CPU 2 outputs V display data to be displayed on the screen.
Write to RAM9. On-screen circuit (hereinafter referred to as OS
A D circuit 6 abbreviates the data on the VRAM 9 written by the display data setting means 8 in synchronization with the sync signal separated from the input signal by the sync separation circuit 1 and outputs it. The video switching circuit 11 fits and combines the video signal separated from the input signal by the sync separation circuit 1 and the OSD color signal output from the OSD circuit 6 (hereinafter referred to as superimpose) and outputs the result to the CRT 12. To do.

[0004]

However, in the conventional method as described above, since the synchronizing signal separated from the video signal is used to output the display data, the user does not include the video signal. If a display screen is output while a channel is selected, a synchronization signal cannot be obtained, so a stable screen that is always synchronized cannot be output.

Further, even when adjustment is performed using a test pattern or the like in a factory, test pattern data must be input from the antenna as an input signal in order to obtain a synchronization signal, and the efficiency of work during factory adjustment is improved. Was hindering the change. Further, it is difficult to make adjustments in the market because the input signal source of the test pattern cannot be obtained.

In view of the above problems, the present invention provides the user with a display screen which is always synchronized regardless of which channel the user selects.
In addition, the test pattern data to be performed at the time of factory adjustment and market adjustment is built into the CPU and output using an internal synchronization signal, so that the factory adjustment and market adjustment can be performed by using the remote controller without inputting the test pattern data from the antenna. The purpose is to improve the efficiency of work during factory adjustment and market adjustment.

[0007]

In order to solve the above problems, an OSD device of the present invention comprises an internal synchronization generating circuit for generating an internal synchronization signal, a synchronization detecting means for receiving an input signal and detecting the synchronization signal. A synchronization switching control means for controlling whether to use internal synchronization or external synchronization is provided.

[0008]

According to the OSD output device of the present invention, even when the sync signal cannot be obtained because the channel not containing the video signal is selected, the internal sync generation circuit incorporated in the OSD circuit allows the OSD circuit to be internally operated. Since the synchronization signal can be obtained, it is possible to always output the display screen in synchronization. In addition, the test pattern data is held in the CPU, and the OSD
It is possible to output in synchronization with the sync signal generated by the internal sync generation circuit built in the circuit, and it is not necessary to connect the antenna to input the video signal when performing factory adjustment / market adjustment. By operating the remote control, the test pattern can be displayed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a television receiver will be described in detail below with reference to the drawings.

In FIG. 1, a sync separation circuit 1 separates a video signal and a sync signal from an input signal and outputs them to a CPU 2. The internal synchronization generating circuit 7 internally generates synchronization. The synchronization detecting means 3 takes in the input signal and detects the synchronization signal. The synchronization switching control means 4 switches to the synchronization signal if the synchronization detection means 3 detects the synchronization signal from the input signal, and if the synchronization signal is not detected from the input signal,
It switches to the internal synchronization signal generated by the internal synchronization generation circuit 7.

The display data setting means 8 writes the display data to be displayed on the screen in the VRAM 9 which is a storage means. OS
In the D circuit 6, the V is set by the display data setting means 8.
A color signal is output to the video switching circuit 11 based on the display data written in the RAM 9. The video switching circuit 11
Is superimposed on the video signal separated from the input signal in the sync separation circuit 1 and the color signal based on the display data output from the OSD circuit 6 and output from the sync switching control means 4. The data is output to the CRT 12 in synchronization with the synchronization signal. The input signal received by the input signal receiving circuit 10 which receives the input signal from the remote controller is output to the input signal determining means 5.

When the input signal determined by the input signal determining means 5 is a remote control code for outputting a test pattern, the synchronization switching control means 4 detects the synchronization signal from the input signal by the synchronization detecting means 3. In this case, the display data setting means 8 writes the test pattern data corresponding to the remote control signal determined by the input signal determining means 5 in the VRAM 9 even when the internal synchronization signal generated in the internal synchronization generating circuit 7 is switched.

The OSD circuit 6 outputs a color signal to the video switching circuit 11 based on the test pattern data written in the VRAM 9 by the display data setting means 8. The video switching circuit 11 outputs the color signal based on the test pattern data output from the OSD circuit 6 to the CRT 12 in synchronization with the internal synchronization signal output from the synchronization switching control means 4. Therefore, even if the user selects a channel that does not include a video signal, the OSD display screen can always be seen in synchronization.

Further, factory adjustment and market adjustment can be performed using a remote controller.

[0015]

As described above, according to the OSD output device of the present invention, by providing the internal sync generation circuit, the sync detection means, and the sync switching control means, in the case where the channel not containing the video signal is selected. Can output a display screen that is always synchronized.

Further, when the test pattern data is held in the CPU and the test pattern is output, the OS is forced to operate.
By switching to the internal sync signal from the internal sync generation circuit held inside the D circuit and outputting the test pattern, it is not necessary to connect the antenna and input the test pattern data signal as an input signal, so factory adjustment・ The test pattern can be displayed by remote control when adjusting the market, which can improve work efficiency.

[Brief description of drawings]

FIG. 1 is a block diagram showing the operation of an OSD output device of the present invention.

FIG. 2 is a block diagram showing the operation of a conventional OSD output device.

[Explanation of symbols]

 1 sync separation circuit 2 CPU 3 sync detection means 4 sync switching control means 5 input signal determination means 6 OSD circuit 7 internal sync generation circuit 8 display data setting means 9 VRAM 10 input signal receiving circuit 11 video switching circuit 12 CRT

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takayokazu Yamanaka 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. A sync separation circuit for separating a sync signal from a video signal, a sync detection means for detecting whether an input signal holds the sync signal, an internal sync generation circuit for generating the sync signal, and the sync detection circuit. Synchronization switching control means for controlling which of the synchronization signal separated by the synchronization separation circuit and the synchronization signal output by the internal synchronization generation circuit to be used by the output from the means, and the screen display data is written in the storage means The display data setting means, the color signal based on the display data set by the display data setting means, and the video signal separated by the synchronization separation circuit are synchronized with the synchronization signal output from the synchronization switching control means and combined. And a video switching circuit for outputting to a display means. 2. An input signal receiving circuit for receiving an input from a remote controller, an input signal determining means for determining an input signal received by the input signal receiving circuit, and an input determined by the input signal determining means. When the signal is the test pattern output signal, the synchronization switching control means forcibly switches to the internal synchronization signal output from the internal synchronization generating circuit, and the display data setting means sets the test pattern data stored in the CPU in the storage means. 2. The synchronization signal control device according to claim 1, wherein the color signal based on the test pattern data built in the CPU is output to the display means in synchronization with the internal synchronization signal output from the internal synchronization generation circuit.