KR19990027034A - How to generate a pattern for white balance adjustment - Google Patents

Abstract

The present invention determines whether there is a white balance switch signal input from a key input unit in a television including an OSD unit for overlapping a video signal corresponding to an input operation control signal on a screen. A white balance adjustment method of a television for switching to a mode, the method comprising: a first step of determining whether the mode is a white balance mode, a second step of counting the number of scanning lines when the first step is switched to the white balance mode, and a detection at the second step By outputting an operation control signal to the OSD unit based on the number of scanned lines, if all patterns for white balance adjustment, that is, the number of scan lines reaches a predetermined value, a predetermined value different from the number of image signals and the number of scan lines converted to the minimum brightness and contrast Brightness and contrast are up to A white balance adjustment pattern without a pattern generator and a plurality of knob manipulations by a method of generating a white balance adjustment pattern including a third process of outputting a black and white video signal and finally a color image signal having maximum brightness and proper contrast. Can be generated.

Description

How to generate a pattern for white balance adjustment

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to white balance adjustment of a television. In particular, in order to facilitate white balance adjustment, a plurality of patterns for white balance adjustment on a CRT are simultaneously output on a screen without the need for a pattern generator and a plurality of knobs. A pattern generating method for white balance adjustment of a television that can facilitate white balance adjustment.

In general, color televisions need to adjust raster, purity magnet, convergence, and white balance to ensure that the video signal is output accurately.

Hereinafter, an embodiment of the white balance adjustment will be described in detail.

The white balance adjustment is performed by turning the channel to a place where there is no broadcast and making the noise-free raster come out without noise, and then raising and fixing the red screen to the maximum.

Then, the brightness and contrast are lowered to the maximum so that the raster is barely visible, the green and blue screens are adjusted so that the raster is white, and the channel is turned to perform black and white broadcasting. Receive, and raise the contrast and brightness as much as possible within the range where the black and white broadcast is not saturated.

As described above, adjust both the bias and drive of the color water pipe so that the brightest part of the black-and-white image is white with the maximum contrast and brightness, and adjust the above two or three times for accurate adjustment. Repeat.

After the above adjustment, the contrast is set to a good state, the brightness is set to the maximum, the auxiliary brightness is adjusted to the most suitable state, the color broadcast is received, and the color saturation adjustment is minimized so that a black and white image is produced.

Then adjust all the balance adjusting variable resistors on the demodulation output side to achieve white balance.

Repeat the above adjustment two or three times so that black-and-white images or rasters are not colored when receiving black-and-white broadcasting, and other colors do not appear on the color when receiving color broadcasting.

However, in the conventional white balance adjustment method as described above, as described above, the user can directly change the brightness and contrast to the minimum or maximum to generate a pattern for white balance adjustment, or use a predetermined pattern generator to generate a white color. After generating a pattern for balance adjustment, a predetermined adjustment should be made.

Therefore, when adjusting the white balance of a conventional television, it is cumbersome to adjust the contrast knob and the brightness knob many times. When a pattern generator is used to solve this problem, a separate pattern generator is required. Adjusting the balance is not easy, and at the time of A / S application, there is a problem that the operator has to bring the pattern generator, so that the movement becomes inconvenient.

An object of the present invention for solving the above problems is to operate a pattern generator and a plurality of knobs so that a plurality of patterns for white balance adjustment on the CRT are simultaneously output on the screen in order to facilitate white balance adjustment. The present invention provides a method for generating a white balance adjustment pattern of a television that can easily adjust the white balance without using the same.

1 is a block diagram schematically showing the configuration of a television.

2 is a flowchart illustrating a method of generating a pattern for adjusting white balance according to the present invention.

A feature of the present invention for achieving the above object is, in the television comprising an OSD unit for overlapping the video signal corresponding to the input operation control signal on the screen to determine whether there is a white balance switch signal input from the key input unit, white balance A white balance adjustment method of a television for converting a television to a white balance mode when there is a switching signal input, the method comprising: a first step of determining whether a white balance mode is used; And a third process of outputting an operation control signal to the OSD unit based on the number of scan lines detected in the second process so that all patterns for white balance adjustment are simultaneously divided and output on the screen.

An additional feature of the present invention is that the third process includes a first step of outputting an image signal in which brightness and contrast are switched to a minimum when the number of scanning lines reaches a predetermined value; And a second step of outputting a black and white video signal with maximum contrast, and a third step of outputting a color video signal with maximum brightness and proper contrast.

Hereinafter, described in detail with reference to the accompanying drawings, preferred embodiments of the present invention.

1 is a block diagram showing a schematic configuration of a television.

In FIG. 1, reference numeral 1 denotes an antenna, and 2 denotes a tuner for selecting a broadcast signal of a channel selected by a preset voltage input from a wireless broadcast signal received through the antenna 1.

5 denotes a P / S separator for separating the image intermediate frequency signal PIF and the voice intermediate frequency signal SIF from the intermediate frequency signal output from the tuner 2, and 6 denotes the P / S separator 5 An audio detector detects an audio signal from an audio intermediate frequency signal (SIF) output from the PDP, and a signal detector 7 detects an image signal from the video intermediate frequency signal (PIF) output from the P / S separation unit (5). Represents wealth.

In addition, reference numeral 8 denotes a key input unit through which the viewer can select a desired channel or select each mode of the television, for example, channel selection, audio output level selection, white balance mode, and the like. The memory in which data corresponding to various operation modes is recorded is shown.

Reference numeral 12 denotes a screen for overlapping and outputting a character or a picture on a screen on which a broadcast signal is output separately from the broadcast signal according to an input operation control signal (On Screen Display). ), And reference numeral 14 serves to generate a PWM signal which is a channel tuning signal corresponding to the input operation control signal.

In addition, reference numeral 21 denotes a voice processor which processes a voice signal according to a predetermined process according to an input control signal although not shown for the voice signal output from the voice detector 6, and 22 denotes the voice signal. A voice amplifier for amplifying and outputting the voice signal processed by the processor 21 to the speaker.

Reference numeral 23 denotes R, Red, and G (Green) corresponding to the image signal by processing color, tint, brightness, etc. on the image signal output from the image detector 7. ), And an image processor for outputting a B (Blue) signal, wherein the RGB signal output from the image processor 23 is an RGB signal which is an output signal of the OSD generator 12 described above in the mixer indicated by reference numeral 24. The mixture is output to the CRT driver 26.

Reference numeral 30 denotes a microprocessor for outputting an operation control signal to various devices constituting the television based on the signal input from the key input section 8.

The operation of the microprocessor will be described below with reference to the flow chart of FIG. 2.

The microprocessor determines whether there is a white balance mode signal input from the key input unit (S101), and when there is a white balance mode signal input, stops the operation of various devices in operation and switches the television to the white balance mode (S102).

After switching to the white balance mode as described above (S102), the microprocessor counts the number of scanning lines and outputs the video signal with the minimum brightness and contrast within a third of the range from the upper side of the screen. The operation control signal is output (S103).

In addition, after the image signal having the minimum brightness and contrast is output (S103) in a portion corresponding to one third of the screen, the microprocessor counts the number of scanning lines and the lowest end of the image signal having the minimum brightness and contrast. The operation control signal is outputted to the OSD unit so that a black and white video signal having the maximum brightness and contrast is output to a portion corresponding to the other third of the screen (S104).

In operation S105, an operation control signal is output to the OSD unit such that a color image signal having a maximum brightness and an appropriate contrast is output to the remaining portion of the screen.

Therefore, according to the present invention, a pattern generator for generating a white balance adjustment pattern is not necessary, and white balance adjustment can be performed simultaneously under a number of conditions without manually operating the brightness knob or the contrast knob for generating the white balance adjustment pattern. The video signal for the split is output on the same screen.

According to the method for generating a white balance adjustment pattern according to the present invention which operates as described above, the white balance adjustment image signals under a plurality of conditions for white balance adjustment can be simultaneously outputted on the same screen by simple key operation. Since no pattern generator is needed for the white balance, and the brightness and contrast knobs do not need to be adjusted for white balance adjustment, no operation is required for pattern generation during white balance adjustment, and the device for predetermined white balance adjustment is not required. By adjusting, the white balance of the television can be easily adjusted.

Claims (2)

In a television including an OSD unit which overlaps a video signal corresponding to an input operation control signal on the screen, it is determined whether there is a white balance switch signal input from a key input unit, and if there is a white balance switch signal input, the television is switched to the white balance mode. In the white balance adjustment method of TV to say, Determining a white balance mode; A second step of counting the number of scanning lines when the first step is switched to the white balance mode; And a third process of outputting an operation control signal to the OSD unit based on the number of scan lines detected in the second process so that all patterns for white balance adjustment are simultaneously output on the screen. How to generate pattern for adjustment. The method of claim 1, wherein the third process comprises: a first step of outputting an image signal in which brightness and contrast are minimized when the number of scanning lines reaches a predetermined value; and the brightness and contrast until the number of scanning lines becomes another predetermined value. And a third step of outputting a black and white video signal having a maximum value, and finally, a third step of outputting a color video signal having a maximum brightness and a suitable contrast. .