KR19990030304U - Convergence adjusting device of color display tube - Google Patents

Abstract

An apparatus for adjusting convergence of a color display tube according to the present invention includes a pattern generator, a luminance measuring unit, a digital / analog converter, a corrector, and an amplifier. The pattern generator applies a predetermined pattern to the drive circuit of the color display tube. The luminance measuring unit measures luminances of red, green, and blue, respectively, for the pattern appearing on the screen of the color display tube. The digital / analog converter converts the luminance data from the luminance measuring unit into an analog signal. The correction unit generates a correction signal by comparing the luminance signal from the digital / analog converter with a reference luminance signal. The amplifier unit amplifies the correction signal from the correction unit and inputs it to the driving circuit of the color display tube.

Description

Convergence adjusting device of color display tube

The present invention relates to a convergence adjusting device of a color display tube, and more particularly, to a convergence adjusting method and apparatus that can be used by a manufacturer such as a color television or a monitor.

In general, a pattern generator is used to adjust the convergence of color indicators. For example, when a white cross hatch pattern is applied to a color display tube with no convergence adjusted, the white pattern is not displayed on the screen of the color display tube, and red, green, And patterns separated by blue are displayed. At this time, the operator adjusts the convergence by turning a convergence adjustment terminal, for example, an offset voltage adjustment terminal for driving a convergence coil, so that the separated patterns coincide with each other.

1 shows a conventional convergence adjustment method. As shown in FIG. 1, the operator 11 applies a test pattern from the pattern generator 13, for example, a white cross hatch pattern, to the drive circuit 122 of the color display tube 12. While watching the screen state of the color display tube 12, the convergence adjustment terminal 121 is directly turned by hand. However, since the convergence adjustment terminal 121 is installed behind the color display tube 12, the operator cannot turn the convergence adjustment terminal 121 by hand while still watching the screen. Therefore, the adjustment error by the operator becomes large, and the adjustment time takes a lot.

An object of the present invention is to provide an apparatus for adjusting the convergence of a color display tube that can be automatically executed.

1 is a schematic diagram illustrating a conventional convergence adjustment method.

2 is a block diagram of an apparatus for adjusting convergence according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

12, 51 ... color indicator tube, 121 ... convergence adjustment terminal,

11, operator, 122, 511 ... drive circuit,

13, 52 ... pattern generator, 53 ... CCD camera,

54 digital / analog converter, 55 ...

56.

An apparatus for adjusting the convergence of a color display tube according to the present invention for achieving the above object includes a pattern generator, a luminance measuring unit, a digital / analog converter, a corrector, and an amplifier. The pattern generator applies a predetermined pattern to the drive circuit of the color display tube. The luminance measuring unit measures luminances of red, green, and blue, respectively, with respect to the pattern appearing on the screen of the color display tube. The digital / analog converter converts the luminance data from the luminance measuring unit into an analog signal. The correction unit generates a correction signal by comparing the luminance signal from the digital / analog converter with a reference luminance signal. The amplifier unit amplifies the correction signal from the correction unit and inputs the correction signal to the driving circuit of the color display tube.

According to the convergence adjustment apparatus of the color display tube of this invention, the automatic execution is possible and the error and time of convergence adjustment by an operator can be reduced.

Preferably, the amplified signal from the amplifier is set to an offset voltage for driving a convergence coil in the color display tube.

Hereinafter, preferred embodiments of the present invention will be described in detail.

As shown in Fig. 2, the convergence adjusting device of the present embodiment includes a pattern generator 52, a CCD (Charge Coupled Device) camera 53 as a luminance measuring unit, a digital / analog converting unit 54, and a correcting unit 55. And an amplifier 56. The pattern generator 52 applies a white cross hatch pattern to the drive circuit 511 of the color display tube 51. The CCD camera 53 measures luminances of red (R), green (G), and blue (B), respectively, for the cross hatch pattern appearing on the screen of the color display tube 51. The digital / analog converter 54 converts the luminance data from the CCD camera 53 into an analog signal. The correction unit 55 generates a correction signal by comparing the luminance signal from the digital / analog converter 54 with a reference luminance signal. Here, the reference luminance signal means a luminance signal obtained in a state where the convergence of the color display tube 51 is well adjusted. The amplifier 56 amplifies the correction signal from the correction unit 55 and inputs it to the drive circuit 511 of the color display tube 51.

When the pattern generator 52 applies a white cross hatch pattern to the driving circuit 511 of the color display tube 51, vertical lines and horizontal lines that cross each other are displayed on the screen of the color display tube 51. Here, each vertical line maintains the same distance from each other, and each horizontal line also maintains the same distance from each other. The CCD camera 53 detects light emitted from the screen of the color display tube 51 and generates red, green and blue luminance data for each intersection of the displayed vertical lines and horizontal lines. The luminance data from the CCD camera 53 is converted into an analog luminance signal through the digital / analog converter 54 and then input to the correction unit 55.

The luminance signal input to the correction unit 55 is a luminance signal of red, green, and blue for each intersection of the vertical lines and the horizontal lines displayed on the color display tube 51. The reference luminance signal is also a corresponding signal obtained in a state where the convergence is well adjusted. The correction unit 55 obtains the sum of the luminance deviations at each intersection and generates vertical and horizontal correction signals proportional thereto. The amplifier 56 amplifies the correction signal input from the correction unit 55 and inputs the correction voltage to the driving circuit 511.

The correction voltage input to the drive circuit 511 acts as an offset voltage for driving the convergence coil in the color display tube 51. As a result, the reference direction and magnitude of the deflection magnetic field generated from the convergence coil in the color display tube 51 are changed, and the convergence of the color display tube 51 is adjusted. On the other hand, the microcomputer in the drive circuit 511 stores the average value of the input correction voltage and applies it as an offset voltage for subsequent convergence coil driving.

As described above, according to the convergence adjustment device of the color display tube according to the present invention, the automatic execution is possible, and the error and time of convergence adjustment by the operator can be reduced.

The present invention is not limited to the above embodiments, and modifications and improvements are possible at the level of those skilled in the art.

Claims (4)

A pattern generator for applying a predetermined pattern to the drive circuit of the color display tube; A luminance measuring unit measuring luminance of red, green, and blue, respectively, with respect to the pattern appearing on the screen of the color display tube; A digital / analog converter for converting luminance data from the luminance measurer into an analog signal; A correction unit for generating a correction signal by comparing the luminance signal from the digital / analog converter with a reference luminance signal; And And an amplifier for amplifying a correction signal from the corrector and inputting the amplified signal to a driving circuit of the color display tube. The method of claim 1, wherein the luminance measuring unit, And measuring luminances of red, green, and blue at each intersection point of the pattern, respectively. The method of claim 1, wherein the amplified signal from the amplifier, And an offset voltage for driving a convergence coil in said color display tube. The method of claim 1, wherein the reference luminance signal, And a luminance signal obtained when the convergence of the color display tube is well adjusted.