JPH11177840A - Device for automatically adjusting amplitude of picture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it unnecessary to previously adjust inputted frequency and output the adjusted frequency or for a user to adjust the frequency by himself (or herself) by controlling the amplitude of a deflection current and the phase of a video signal by a microcomputer so that a detected video signal is displayed in an optimum state and automatically adjusting the size of a picture. SOLUTION: The automatic picture amplitude adjusting device for a television receiver and a display monitor corresponding to plural frequency levels is constituted of a video signal detection circuit 1 for detecting a video signal, a picture amplitude adjusting circuit 2 for adjusting the amplitude of a picture and a picture position adjusting circuit 3 for adjusting the position of the picture. A video signal area in a video signal inputted to a multi-scanning set is detected by the circuit 1. The detected video signal is automatically adjusted by both the circuits 2, 3 so as to obtain an optimum picture.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a television receiver corresponding to a plurality of frequencies and a display monitor.

[0002]

2. Description of the Related Art Conventionally, a television receiver and a display monitor (hereinafter, referred to as a multi-scan set) corresponding to a plurality of frequencies are in a state of a screen amplitude previously adjusted with respect to an input frequency. Or, the adjustment of the screen amplitude is released to the user, and the user adjusts the state of the screen amplitude by himself.

[0003]

In the conventional method of adjusting the screen amplitude at the time of shipment as before, the screen amplitude to be adjusted is limited, and the multi-scan set cannot cope with all the signals. There was a problem. Also, in the method of releasing the adjustment to the user, it is difficult for a novice user to understand, and there is a case where the user misunderstands the malfunction.

[0004]

A video signal detection circuit for detecting a video signal and a deflection current detection circuit for detecting a deflection current are compared, so that the video signal is positioned at the center with respect to the deflection current. A microcomputer that adjusts the amplitude of the deflection current and the phase of the video signal so that the detected video signal is displayed optimally, and includes a screen position adjustment circuit that adjusts the phase and an amplitude adjustment circuit that adjusts the amplitude of the deflection current. Control and automatically adjust the screen size.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first invention of the present invention has a video signal detection circuit for detecting a video signal, a screen amplitude adjustment circuit for adjusting a screen amplitude, and a screen position adjustment circuit for adjusting a screen position. It is possible to optimally adjust the screen according to the detected video signal.

Further, the second invention has a video signal detection circuit for detecting a video signal and a deflection current detection circuit for detecting a deflection current, and compares the two so that the video signal is located at the center with respect to the deflection current. A screen position adjustment circuit for adjusting the phase, and an amplitude adjustment circuit for adjusting the amplitude of the deflection current, wherein the amplitude of the deflection current and the phase adjustment of the video signal are adjusted so that the detected video signal is displayed optimally. , Enables the microcomputer to control and automatically adjust the screen size.

Further, a third aspect of the present invention, in addition to the second aspect of the present invention, further comprises a mode switching circuit capable of selecting two types of modes: 16: 9 mode and 4: 3 mode.
It is possible to automatically adjust the type of optimal display.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An automatic screen amplitude adjusting apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram of an automatic screen amplitude adjusting apparatus according to Embodiment 1 of the present invention. The device of the present invention includes a video signal detection circuit 1 for detecting a video signal,
It comprises a screen amplitude adjustment circuit 2 for adjusting the screen amplitude and a screen position adjustment circuit 3 for adjusting the screen position.

The video signal input to the multi-scan set has a video signal area detected by a video signal detection circuit 1. The screen amplitude adjustment circuit 2 and the screen position adjustment circuit 3 automatically adjust the detected video signal to be the optimum screen, and the screen is optimum.

(Embodiment 2) FIG. 2 is a block diagram of an automatic screen amplitude adjusting apparatus according to Embodiment 2 of the present invention. The apparatus of the present invention comprises a horizontal / vertical deflection circuit 4 and a deflection current detection circuit 1.
7, a video signal detecting circuit 1 for detecting a video signal, a comparing circuit 5 for comparing a video signal with a deflection circuit, a screen amplitude adjusting circuit 2 for adjusting a screen amplitude, and a screen position adjusting circuit 3 for adjusting a screen position. And a microcomputer 6 for controlling the amplitude and the position.

FIG. 3 shows waveforms of respective parts used for explaining the embodiment. FIG. 5 shows a general circuit of a horizontal deflection circuit as an example of a deflection circuit.

The video signal input to the multi-scan set is detected by the video signal detection circuit 1 in the area of the video signal. Let the time of the detected video signal area be TV. C
The effective display area of the RT is determined in advance by specifications (specifications). Therefore, it is known how long the one scanning distance of the image area is at an optimum display position. This distance is L. On the other hand, the synchronization signal input to the multi-scan set operates the horizontal and vertical deflection circuits.
The frequency can be determined from the input synchronization signal. The time of one cycle can also be determined from the frequency. This time is defined as Tp. Normally, the retrace time is constant depending on the circuit. This time is defined as Tr. Time T calculated from frequency
The time obtained by subtracting the retrace time Tr from p becomes the raster area time T ↓ RAS. T ↓ RAS = Tp-Tr The comparison circuit compares T ↓ RAS and TV, and sends to the microcomputer the calculation data for TV to be L and the data for TV to change the phase to the center of T ↓ RAS.

Since L is distance and TV is time, it is sufficient to know the speed. In this case, the speed is the PP value of the deflection current, and the deflection current PP is determined by the + B voltage of the deflection circuit.
The microcomputer controls the screen position adjustment circuit 3 and the screen amplitude adjustment circuit 2 (+ B voltage) based on the data from the comparison circuit 5 to perform an optimum screen display. The deflection current generated at this time is detected by the deflection current detection circuit 17 to detect a raster area. The detected video signal area and the raster area are compared by the comparison circuit 5 and the deviation of the video signal with respect to the raster is notified to the microcomputer 6. The microcomputer 6 controls the screen position adjustment circuit 3 and the screen amplitude adjustment circuit 2 to correct this deviation,
Perform optimal screen display.

(Embodiment 3) FIG. 4 is a block diagram of an automatic screen amplitude adjusting apparatus according to Embodiment 3 of the present invention. The configuration is such that a device for selecting a screen size between 16: 9 and 4: 3 is added to the block diagram described in the second embodiment. The operation is the same as the operation described in the second embodiment, and the optimum screen is displayed by further selecting the screen size to 16: 9 or 4: 3. The effect is the same as that of the second embodiment, and an optimal screen is automatically displayed.

[0016]

According to the present invention, since the video signal is automatically adjusted, there is no need to make adjustments in advance at the input frequency before shipping, and it is not necessary for the user to make adjustments on his own.

[Brief description of the drawings]

FIG. 1 is a block diagram of an automatic screen amplitude adjustment device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a screen amplitude automatic adjustment device according to a second embodiment of the present invention.

FIG. 3 is a diagram illustrating a relationship between a deflection current, a collector pulse, and a video signal used in the description of FIG.

FIG. 4 is a block diagram of a screen amplitude automatic adjustment device according to a third embodiment of the present invention.

FIG. 5 is a circuit diagram showing an example of the deflection circuit shown in FIG. 2;

[Explanation of symbols]

 Reference Signs List 1 video signal detection circuit 2 screen amplitude adjustment circuit 3 screen position adjustment circuit 4 horizontal / vertical deflection circuit 5 comparison circuit 6 microcomputer 7 deflection current waveform 8 collector pulse waveform 9 video signal waveform 10 multi scan set 11 16: 9, 4: 3 Selection 12 Transistor 13 Diode 14 Capacitor 15 DY 16 Coil 17 Deflection current detection circuit

Claims (3)

[Claims] 1. A video signal detecting circuit for detecting a video signal, a screen amplitude adjusting circuit for adjusting a screen amplitude, and a screen position adjusting circuit for adjusting a screen position, wherein the screen is optimized according to the detected video signal. An automatic screen amplitude adjustment device characterized by adjustment. 2. A screen having a video signal detection circuit for detecting a video signal and a deflection current detection circuit for detecting a deflection current, and comparing the two to adjust the phase so that the video signal is located at the center with respect to the deflection current. A position adjustment circuit, and an amplitude adjustment circuit that adjusts the amplitude of the deflection current, controls the microcomputer to adjust the amplitude of the deflection current and the phase of the video signal so that the detected video signal is displayed optimally, and reduces the screen size. Automatic screen amplitude adjustment device characterized by automatic adjustment. 3. The automatic screen amplitude adjustment apparatus according to claim 2, wherein two kinds of optimum displays are automatically adjusted by selecting a 16: 9 mode and a 4: 3 mode.