JPH10200914A - Geomagnetic correcting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the adjustment of a convergence component by making an initially adjusted color correction value the offset value of a convergence component of the other two colors and performing arithmetic processing. SOLUTION: After a user adjusts a green raster center on a menu screen for geomagnetic correction by using remote control, the moving amount is made offset value of red and blue. That is, initial values of red, green and blue before adjustment are r01, g01 and b01 respectively, adjustment values are klr, klg and klb, where k is a coefficient. They concretely represent in expressions as follows; green 1=g01+k1g, red 1=r01+k*k1g+k1r (fine adjustment value), and blue 1=b01+k*k1g+k1b (fine adjustment value). Red and blue perform geomagnetic correction through only fine adjustment of klr and klb. In the case of digital convergence, because a correction amount is in proportion to adjustment time, fine adjustment shortens time and has a simplified operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a three-tube CRT projection television in which a conver shift occurs due to the influence of terrestrial magnetism.

[0002]

2. Description of the Related Art Conventional geomagnetism correction (static conversion adjustment) has two methods, automatic adjustment and manual adjustment.
As a representative patent for automatic adjustment, for example, Japanese Patent Laid-Open No. 59-1
No. 34966 has been proposed. The configuration diagram is shown in FIG.
Shown in

That is, a signal generator for generating a reference signal for automatically performing terrestrial magnetism correction, a detector for converting a shift due to terrestrial magnetism of the reference signal into a voltage, and a control of a correction amount according to the voltage converted from the shift amount. A microcomputer that performs the operation, a DAC unit that converts data from the microcomputer into a voltage, an amplifier that amplifies the output of the DAC, and a CRT that generates an electromagnetic field from the amplifier output
It is composed of a convergence yoke that deflects the internal electrons, and the feature does not require any adjustment. On the other hand, there are problems such as an increase in the circuit size of the detection unit, an increase in the capacity of the control software for the microcomputer, an increase in the cost due to the addition of a control signal generation unit, and erroneous detection due to the influence of external light.

Next, FIG. 6 shows a configuration diagram described in, for example, JP-A-5-236489 as a representative patent of manual adjustment. As can be seen from FIG. 6, the light receiving unit for controlling the terrestrial magnetism with the remote controller and the remote control signal are converted into bus data, and the microcomputer and the DC output of the terrestrial magnetism static DAC for converting the bus data into DC voltage are added to the converter correction waveform. It is composed of an amplifier that performs current amplification and a convergence yoke that generates an electromagnetic field from the amplifier output. The feature is that a circuit can be realized at low cost, but on the other hand, adjustment for each adjustment color (red, green, blue) However, in a TV that requires a plurality of broadcast systems and requires a separate adjustment for each input signal (NTSC system, PAL system, etc.), there is a problem of poor usability.

[0005]

In order to satisfy the above-mentioned problems (cost reduction, prevention of erroneous detection, usability), it is necessary to improve usability by manual adjustment. That is, it has been required to simplify the adjustment of a total of six convergence components in terms of color (red, green, blue) and frequency (NTSC system, PAL system, etc.).

An object of the present invention is to simplify adjustment of a convergence component.

[0007]

In order to solve the above-mentioned problems, a convergence correction apparatus according to the present invention, when performing terrestrial magnetism correction, compares the first adjusted correction value among the three R, G, and B rasters with the other two values. The arithmetic processing is performed as an offset value of the color convergence component.

Further, a plurality of broadcasting systems (NTSC system, P
When performing a geomagnetic correction in a TV receiver capable of inputting an AL system, a MUSE system, etc., the adjustment value of each R, G, B of the signal of one system is converted to the convergence component of each R, G, B of the other signals. By performing arithmetic processing as the offset value of, the adjustment can be simplified.

According to the present invention, a screen size of 48
In the case of an inch (wide screen), FIG. 3 shows how a user performs a geomagnetic correction from a menu screen using a remote controller on a raster (video) center moving on a circle (broken line portion) having a diameter of 10 mm due to the influence of geomagnetism. The user
The raster (video) center is adjusted to the screen center (+). As shown in FIG. 4, the influence of geomagnetism (in the direction of arrow A) is a force that is constantly applied from one direction regardless of the colors of R, G, and B. Therefore, by applying the same reverse magnetic field (in the direction of arrow B), the deviations of R, G, and B become the same except for the optical mounting angle 光学 of the CRT and the dispersion of the convergence yoke. Therefore, the adjustment can be simplified by performing a calculation process using the first adjusted adjustment value as the offset value of the convergence components of the other two colors.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to a fourth aspect of the present invention is directed to a light receiving section for controlling geomagnetic correction by a remote controller, a microcomputer for converting a remote control signal to bus data, and a geomagnetic for converting bus data to a DC voltage. Static DAC for correction
And a convergence yoke that generates an electromagnetic field from the amplifier output to deflect electrons in the CRT, and an R, G, B3 A terrestrial magnetism correction apparatus characterized by a calculation process in which a correction value adjusted first among color rasters is an offset value of a convergence component of the other two colors, and is an arbitrary one of three colors of R, G, and B rasters. By adjusting one color to the center, the other two colors are automatically adjusted to the center.

According to a fifth aspect of the present invention, there is provided a light receiving unit for controlling geomagnetic correction by a remote controller, a microcomputer for converting a remote control signal to bus data, and a static DAC for geomagnetic correction for converting bus data to a DC voltage. And a convergence yoke that generates an electromagnetic field from the amplifier output and deflects electrons in the CRT, and an amplifier that adds a DC output to a conver correction waveform to amplify current and a convergence yoke that deflects electrons in the CRT. In the case of a TV capable of inputting a signal (NTSC system, PAL system, MUSE system, etc.), the adjustment value of each R, G, B of one system signal is used as the convergence component of each R, G, B of the other signals. It is a geomagnetic compensator characterized by the calculation processing of the offset value. By adjusting the signal of one method, the other method is unadjusted. With a Mutoyuu action.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A geomagnetic correction device according to an embodiment of the present invention will be described below with reference to FIGS.

Embodiment 1 A solid cross in FIG. 3 is green.
The target adjustment position of the raster (video) center is shown, and the circumference of the broken line is a green raster (video) due to the influence of geomagnetism.
The center is shifted. The user uses the remote control to select “green” from the menu screen for geomagnetic correction.
After adjusting the n raster (video) center to the solid cross shown in FIG. 3, the amount of movement is set as an offset value of red and blue, that is, the initial values of red, green, and blue before adjustment are ro1, go1, and bo1, respectively. When the adjustment value is specifically expressed by an equation using klr, klg, klb, and coefficient k, green1 = go1 + klg ... a red1 = ro1 + k * klg + klr (fine adjustment value) ... a blue1 = bo1 + k * klg + klb (fine adjustment value) By making the microcomputer process the underlined portion from (a) to (b), red and blue can be corrected for geomagnetism only by fine adjustment of klr and klb. In the case of digital convergence, the correction amount and the adjustment time are in a proportional relationship, so that fine adjustment only has the effect of reducing the time and simplifying the operation.

(Embodiment 2) After the adjustment of the above equation, for signals having different frequencies, the initial values of red, green, and blue before the adjustment are concretely expressed by an equation using ro2, go2, and bo2, respectively. go2 + klg ... a red2 = ro2 + k * klg + klr ... blue2 = bo2 + k * klg + klb ... The underlined part from the wye is processed by the microcomputer as shown in FIG. Has the effect that adjustment can be made.

In addition, red and blue are used for the adjustment colors.
e A method based on the raster, a method that can eliminate the fine adjustment of klr and klb depending on how the coefficient k is determined, and a conversion table (A) as in the following equation from It is also possible to implement the method of having. green2 = go2 + A (klg) ... red2 = ro2 + A (k * klg + klr) ... blue2 = bo2 + A (k * klg + klb) ...

[0016]

As described above, according to the present invention, the advantageous effect of simplifying the static converter adjustment can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a geomagnetic correction device according to the present invention.

FIG. 2 is a configuration diagram of a data processing method by a microcomputer.

FIG. 3 is a diagram showing a shift of a raster due to the influence of geomagnetism on a screen.

FIG. 4 is a diagram showing the influence and correction of terrestrial magnetism in a westward set;

FIG. 5 is a configuration diagram of a conventional automatic geomagnetism correction device.

FIG. 6 is a configuration diagram of a conventional manual geomagnetism correction device.

[Explanation of symbols]

 01 Screen 02 Detector 03 CRT 04 Convergence Yoke 05 Amplifier 06 Microcomputer 07 DAC 08 Signal Generator 09 Remote Control Receiver 10 Microcontroller 11 DAC 12 Amplifier 13 CRT 14 Convergence Yoke 15 Remote Controller Receiver 16 Microcontroller 17 Static DAC 18 Amplifier 19 CRT Yoke 21 Screen 22 Raster position with set facing west 23 Raster position with set facing south 24 Raster position with set facing east 25 Raster position with set facing north 26 Optical Box 27 Magnetic Field Due to Geomagnetism 28 Convergence Yoke Correction Magnetic Field 29 Convergence Yoke 30 CRT 31 CRT Tilt from Vertical Direction

Claims (5)

[Claims] 1. Adjusting any one of R, G, and B rasters to the center of the target adjustment value, and automatically adjusting the other two colors to the center of the target adjustment value. Geomagnetic correction device characterized by the above-mentioned. 2. A signal of a plurality of broadcasting systems (NTSC system,
A geomagnetic correction device characterized in that a TV receiver capable of inputting a PAL system, a MUSE system, etc., adjusts a signal of one system and does not need to adjust other systems. 3. Adjusting any one of R, G, and B rasters to the center of the target adjustment value, and automatically adjusting the other two colors to the center of the target adjustment value; and , Signals of multiple broadcasting systems (NTSC system,
A geomagnetic correction device characterized in that a TV receiver capable of inputting a PAL system, a MUSE system, etc., adjusts a signal of one system and does not need to adjust other systems. 4. A light receiving unit for controlling geomagnetic correction with a remote controller, a microcomputer for converting a remote control signal into bus data,
A static DAC for terrestrial magnetism that converts bus data into a DC voltage, an amplifier that adds a DC output to a converter correction waveform to amplify current, and a convergence yoke that generates an electromagnetic field from the amplifier output and deflects electrons in the CRT A terrestrial magnetism correction apparatus comprising a terrestrial magnetism correction device configured to calculate a correction value that is adjusted first among the three rasters of R, G, and B as offset values of convergence components of the other two colors. 5. A light receiving section for controlling geomagnetic correction by a remote controller, a microcomputer for converting a remote control signal into bus data,
A static DAC for terrestrial magnetism that converts bus data into a DC voltage, an amplifier that adds a DC output to a converter correction waveform to amplify current, and a convergence yoke that generates an electromagnetic field from the amplifier output and deflects electrons in the CRT In the geomagnetic compensator configured, a plurality of broadcast system signals (NTSC system, PAL system, MUSE system, etc.)
In the case of a TV capable of inputting the terrestrial magnetism, the terrestrial magnetism correction is characterized in that the adjustment value of each R, G, and B of one of the signals is an offset value of the convergence component of each of the other signals. apparatus.