KR100268479B1 - Compensation apparatus for color position of display system according to adjusting a brightness - Google Patents

Abstract

PURPOSE: An apparatus for compensating a color coordinate according to a brightness control of a video display device is provided to compensate cutoff voltages of RGB(Red, Green, and Blue) colors according to a brightness control signal input, so as to prevent the color coordinate from being distorted. CONSTITUTION: A video preamplifier(10) amplifies video signals of RGB(Red, Green, and Blue) colors inputted from a video card. A microcomputer(20) inputs horizontal/vertical synchronous signals from the video card, and outputs a reference oscillation signal. The microcomputer(20) calculates cutoff voltage compensation values of RGB according to a brightness control signal input, and outputs cutoff voltage compensation signals of RGB colors and a brightness control signal. A horizontal/vertical signal processor(30) inputs the reference oscillation signal and the horizontal/vertical synchronous signals, and supplies the signals to a high voltage circuit and a reflection circuit. An FBT(Fly Back Transformer)(40) generates a high voltage supplied to a cathode-ray tube(60). A video main amplifier(50) controls the brightness of the video signals, according to signals controlled in the video preamplifier(10) by the cutoff voltage compensation signals and the brightness control signal.

Description

Color coordinate compensation device according to brightness adjustment of image display device

The present invention relates to a color coordinate compensation device according to brightness adjustment of an image display device, and more particularly, to compensate for cutoff voltages of R, G, and B according to the brightness adjustment signal input when brightness is adjusted by a user. The present invention relates to a color coordinate compensation device according to brightness adjustment of an image display device to prevent distortion of color coordinates.

In general, in order to control screen brightness of a video display device such as a monitor having a cathode ray tube, the screen brightness control command is controlled through a switch or volume installed outside the video display device or by inputting a screen brightness control command through an input device such as a keyboard.

As such, when a screen brightness control command is input through an adjustment of a switch or volume or a keyboard to adjust screen brightness, the first grid voltage of the electron gun or the cathode clamp level is changed to change the brightness of the screen.

In other words, the greater the voltage between the cathode and the first grid, the smaller the amount of electrons coming from the cathode, which reduces the brightness of the screen, and the smaller the voltage between the cathode and the first grid, the greater the amount of electrons coming from the cathode, resulting in a higher brightness of the screen. It is increased.

In addition, the cathode ray tube used in the image display apparatus such as the monitor described above requires a specific range of brightness values, and the cathode ray tube is cutoff according to the bias of the R, G and B color signals displayed on the cathode ray tube. The voltage is set, and a bias voltage is generated based on the set cutoff voltage to change the brightness.

In this process, when the _cutoff voltages of the color signals of R, G, and B are different, the ratio of R _cutoff : G _cutoff : B _cutoff varies according to the brightness value.

As such, the ratios of the cut-off voltages of the color signals of R, G, and B, which are important factors for determining color coordinates, are adjusted for each product.

However, as described above, the brightness adjustment of the conventional video display device can be adjusted by the user by adjusting the switch or volume installed outside the video display device or by inputting a control command through an input device such as a keyboard. When the brightness value is adjusted by this, a problem occurs that the color coordinates that were adjusted during the production of the product are distorted.

Accordingly, an object of the present invention is to provide a color coordinate compensation device according to brightness adjustment of an image display device to prevent distortion of color coordinates by compensating cutoff voltages of R, G, and B according to a brightness adjustment signal input when brightness is adjusted by a user. To provide.

1 is a block diagram schematically illustrating an image display device for compensating color coordinates according to brightness adjustment according to the present invention;

FIG. 2 is a diagram illustrating a relationship between a voltage applied to a cathode ray tube and a compensation value according to color coordinates of each of R, G, and B when brightness is adjusted by a user.

Explanation of symbols on the main parts of the drawings

10: video preamp 20: microcomputer

30: horizontal and vertical signal processing unit 40: FBT

50: video main amplifier 60: cathode ray tube

Color coordinate compensation device according to the brightness adjustment of the image display device according to the present invention for achieving this object is a video preamplifier for amplifying the video signal of the R, G and B input from the video card provided in the computer system, the video card Outputs the reference oscillation signal from horizontal and vertical synchronous signals, calculates the cutoff voltage compensation values of R, G and B according to the user's brightness adjustment signal, and compensates the cutoff voltage compensation signals of R, G and B And a horizontal and vertical signal processor for receiving a reference oscillation signal and a horizontal / vertical synchronization signal from the microcomputer and a video card, and supplying a signal to a high voltage circuit and a deflection circuit. FBT connected to the output terminal of the signal processor to generate high pressure supplied to the cathode ray tube, and R, G input from the microcomputer And a video main amplifier configured to adjust the brightness of the signal according to a signal input and adjusted by the video preamplifier according to the cut-off voltage compensation signal of B and a brightness adjustment control signal input from the microcomputer.

Hereinafter, with reference to the accompanying drawings will be described in detail the color coordinate compensation device according to the brightness adjustment of the image display device of the present invention.

1 is a block diagram schematically illustrating an image display device that compensates color coordinates according to brightness adjustment according to the present invention.

As shown, the video preamplifier 10 amplifies and outputs video signals of R, G, and B input from a video card (not shown).

The microcomputer 20 receives horizontal and vertical synchronization signals from a video card provided in a computer system and outputs a reference oscillation signal.

In addition, the microcomputer 20 outputs the signal to the video main amplifier 50, which will be described later, when a brightness adjustment signal is input by a user through an input device such as a keyboard or a switch or volume installed outside the video display device. do.

The horizontal and vertical signal processing unit 30 receives the reference oscillation signal and the horizontal / vertical synchronization signal from the microcomputer 20 and the video card and sends the signal to the high voltage circuit (not shown) and the deflection circuit (not shown). Supply.

FBT 40 is connected to the output terminal of the horizontal and vertical signal processing unit 30 to generate a high pressure supplied to the cathode ray tube 60 to be described later.

The video main amplifier 50 is input from the microcomputer 20 and a signal input by being adjusted by the video preamplifier 10 according to the compensated cutoff voltages of R, G, and B calculated and output from the microcomputer 20. The brightness of the video signal of the R, G and B is adjusted according to the brightness adjustment control signal is output to the cathode ray tube 60.

Next, the relationship between the voltage applied to the cathode ray tube and the compensation value according to the color coordinates of each of the R, G and B in the color coordinate compensation device according to the brightness adjustment of the image display device according to the present invention configured as described above is adjusted by the user. This will be described in detail with reference to FIG. 2.

First, when the user adjusts the brightness of a video display device equipped with a cathode ray tube by using a switch or a volume installed outside the video display device or inputs a brightness adjustment signal through an input device such as a keyboard, the brightness adjustment signal is It is input to the microcomputer 20.

When the brightness adjustment signal is input by the user to the microcomputer 20 as described above, the microcomputer 20 calculates cutoff voltage compensation values of R, G, and B for preventing the color coordinate from being shifted during the brightness adjustment.

In this case, the microcomputer 20 represents a ratio of the brightness due to the cutoff voltages of R, G, and B in order to make the color coordinates constant while keeping the brightness constant to compensate for the cutoff voltages of R, G, and B. Equations 1 and 2 are input in advance.

Therefore, the microcomputer 20 compensates for the cutoff voltages of R, G, and B to prevent distortion of color coordinates according to brightness adjustment input by the user by using Equation 3 obtained by Equations 1 and 2 below. It calculates the values (R _C ', G _C ', B _C ').

For example, as shown in FIG. 2, when the brightness adjustment signal is input by the user and the brightness is changed, the ratio (a) of the cutoff voltages of R, G, and B set at the time of production is changed according to the brightness change. R, G, and B will be compared with the ratio (b) of the cut-off voltage of each.

When the ratio (a) of the cut-off voltage of each of R, G, and B set at the time of production of the product and the ratio (b) of the cut-off voltage of each of the R, G, and B according to the brightness change are different, the color coordinate is constant. Since it is not maintained, the ratio (c) of the cut-off compensation voltages R _C ', G _C ', and B _C 'of each of R, G, and B using Equation 3 is calculated.

The cutoff voltage compensation signals of R, G, and B compensated in this way are output to the video preamplifier 10 together with the brightness adjustment control signal, and the video main amplifier 50 is inputted by the video preamplifier 10; After adjusting the brightness of the video signals of the R, G and B input from the video preamplifier 10 according to the cut-off voltage compensation signals of the G and B and the brightness control signal input from the microcomputer 20, the cathode ray tube ( 60).

As described above, according to the color coordinate compensation device according to the brightness adjustment of the image display device of the present invention, when the brightness is adjusted by the user, the cut-off voltage of R, G and B to prevent the color coordinates due to the input of the brightness adjustment signal By compensating for keeping the color coordinates constant, there is an effect of preventing product degradation and enhancing the reliability of the product.

Claims (2)

A video preamplifier for amplifying the R, G, and B video signals input from a video card included in the computer system; It receives horizontal and vertical synchronization signals from the video card, outputs a reference oscillation signal, calculates cutoff voltage compensation values of R, G, and B according to the brightness adjustment signal input of the user, and compensates for the compensated R, G, and B A microcomputer for outputting a cutoff voltage compensation signal and a brightness adjustment control signal; Horizontal and vertical signal processing units for receiving a reference oscillation signal and a horizontal / vertical synchronization signal from the microcomputer and a video card and supplying a signal to a high voltage circuit and a deflection circuit; FBT connected to the output terminal of the horizontal and vertical signal processing unit to generate a high pressure supplied to the cathode ray tube; And The video signals of R, G, and B are controlled according to the cut-off voltage compensation signals of R, G, and B inputted from the microcomputer, and the signals are adjusted and input from the video preamplifier and the brightness adjustment control signals input from the microcomputer. Color coordinate compensation device according to the brightness adjustment of the video display device, characterized in that consisting of a video main amplifier for adjusting the brightness of the. The method of claim 1, wherein the cut-off voltage compensation signal of R, G and B to prevent the color coordinates output from the microcomputer is calculated by the equation (3) according to the brightness coordinates of the image display device Compensator. [Equation 3]