JPH05236516A - Method for adjusting convergence and device therefor - Google Patents

Abstract

PURPOSE:To improve the precision of measurement and adjustment of color convergence by using a crosstalk coefficient to calculate the luminance level distribution of each color fluorescence based on the light intensity level distribution of each color component. CONSTITUTION:A solid-state image pickup device 3 picks up the image of a display face of a color cathode-ray tube 1 through a filer 2 consisting of red, green, and blue filters to measure the light intensity distribution on all of the display face. A signal processor 6 performs prescribed signal processing based on respective chrominance signals and data read out from respective chrominance signal memories 5R, 5G, and 5B. That is, crosstalk coefficients indicating the light intensity levels in which red, green, and blue color fluorescence forming a white measuring pattern in the color cathode-ray tube 1 are measured as the other color components through the color filter 2 are preliminarily measured, and crosstalk coefficients are used to calculate the luminance level distributions based on light intensity level distributions of respective color components, which are measured through the filter 2, of the measuring pattern displayed on the color cathode-ray tube 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a convergence adjusting method and a convergence adjusting device for adjusting color convergence in a color cathode ray tube.

[0002]

2. Description of the Related Art Conventionally, in the adjustment of so-called color convergence in a color cathode ray tube, a white measurement pattern is displayed by this color cathode ray tube, and the brightness level distribution of each color fluorescence forming the measurement pattern is measured by a solid-state image sensor. Measurement is performed using an image pickup device included therein.

In the color cathode ray tube, white is displayed by superposing red fluorescent light, green fluorescent light and blue fluorescent light. Therefore, if the luminance level distributions of the respective colors of fluorescence are the same, it means that the convergence is good and so-called white without color shift is displayed.

The above-mentioned image pickup device has three solid-state image pickup elements for red, green and blue. Therefore, the solid-state imaging device for each color measures the light intensity level distribution of the color component corresponding to each of the measurement patterns. That is, the red solid-state image sensor measures the measurement pattern through the red filter. Further, the solid-state image pickup device for green color measures the measurement pattern through a green color filter. Similarly, the blue solid-state image sensor measures the measurement pattern through the blue filter.

The convergence adjustment is performed by adjusting the deflection coil and the like of the color cathode ray tube so that the light intensity level distributions measured by the solid-state image pickup devices match.

By the way, the spectral transmission characteristics of each color filter do not always match the spectral emission characteristics of each color fluorescence. That is, although it is ideal that the red fluorescence emitted from the red phosphor is 100% transmitted by the red filter and completely blocked by the green and blue filters, the red fluorescence is actually Even the green and blue filters are slightly transmitted. Similarly, the green fluorescence is slightly transmitted by the red and blue filters, and the blue fluorescence is slightly transmitted by the red and green filters.

The red fluorescent light transmitted through the green and blue filters, the green fluorescent light transmitted through the red and blue filters, and the blue fluorescent light transmitted through the red and green filters are measured as crosstalk, respectively. This causes a measurement error of the brightness level distribution of each color fluorescence.

In order to remove and correct the measurement error due to such crosstalk, for example, the light intensity levels of the respective color components are compared with respect to each pixel forming the display surface of the color cathode ray tube, and the maximum color component is obtained. The measured values of the color components other than are regarded as crosstalk and are excluded from the measured values. Alternatively, a measurement value that is equal to or less than the maximum light intensity level that can occur as crosstalk is excluded from the measurement value regardless of which color component.

[0009]

By the way, as described above, the light intensity levels of the color components of the respective pixels are compared, and the measured value of the color component other than the maximum color component is regarded as crosstalk. When removing and correcting the measurement error due to the crosstalk by excluding it from the measured value, the number of data to be compared becomes enormous. Therefore, a dedicated calculation device for performing this data processing is required. You need to prepare.
In this case, it takes a long time to process the data,
Inability to make quick measurements and adjustments.

In addition, when a measurement value which is equal to or lower than the maximum light intensity level that can occur as crosstalk is excluded from the measurement value regardless of which color component, the measurement error due to the crosstalk is removed and corrected. In addition, since the measured values of the color components that should not be excluded are treated as crosstalk and excluded, high-precision measurement and adjustment cannot be performed.

Therefore, the present invention is proposed in view of the above-mentioned circumstances, and provides a convergence adjusting method capable of quickly and highly accurately measuring and adjusting color convergence using a simple processing device. The purpose is to provide.

It is another object of the present invention to provide a convergence adjusting device which has a simple device structure and which can measure and adjust color convergence quickly and with high accuracy.

[0013]

In order to solve the above-mentioned problems and achieve the above-mentioned objects, a convergence adjusting method according to the present invention is a white cathode having a white measurement pattern consisting of red fluorescence, green fluorescence and blue fluorescence. Is displayed to measure the luminance level distribution for each of these color components of the measurement pattern using a color separation means for separating white into red, green, and blue, and the convergence adjustment method is performed based on the measurement result. And
A crosstalk coefficient indicating a light intensity level measured as a component of another color when each color fluorescence of the measurement pattern passes through the color separation means is measured in advance, and the crosstalk coefficient displayed on the color cathode ray tube is measured. The brightness level distribution of the fluorescent light of each color is calculated using the crosstalk coefficient based on the light intensity level distribution of each color component measured through the color separation means of the measurement pattern.

Further, the convergence adjusting device according to the present invention comprises a color separating means for separating white into red, green and blue, and white for measuring white consisting of red fluorescence, green fluorescence and blue fluorescence displayed on a color cathode ray tube. A light measuring means for measuring a pattern through the color separating means and measuring a light intensity level distribution of each color component separated by the color separating means; and a light measuring means for measuring the measurement pattern through the color separating means. Based on the light intensity level distribution of each color component measured by the light measuring unit, a storage unit that stores a crosstalk coefficient indicating the light intensity level at which the fluorescence of each color is measured as a component of another color when measured by And a calculating means for calculating the luminance level distribution of each color fluorescence using the crosstalk coefficient stored in the storing means.

[0015]

In the convergence adjusting method according to the present invention, the red fluorescent light, the green fluorescent light and the blue fluorescent light forming the white measuring pattern in the color cathode ray tube are measured as the components of other colors when passing through the color separation means. The crosstalk coefficient indicating the light intensity level is measured in advance, and the crosstalk is based on the light intensity level distribution of each color component measured through the color separation means of the measurement pattern displayed on the color cathode ray tube. Since the brightness level distribution of each color fluorescence is calculated using the coefficient, even if the spectral emission characteristics of each color fluorescence and the spectral color separation characteristics of the color separation means do not match, the brightness level distribution of each color fluorescence is accurately calculated. Can be measured.

Further, in the convergence adjusting device according to the present invention, the calculating means is based on the light intensity level distribution of each color component of the white measurement pattern measured by the light measuring means through the color separation means, and the above measurement is performed. Since each color fluorescence forming the use pattern is supplied from the storage means using a crosstalk coefficient indicating a light intensity level measured as a component of another color, the brightness level distribution of each color fluorescence is calculated, Even if the spectral emission characteristics and the spectral color separation characteristics of the color separation means do not match, the luminance level distribution of each color fluorescence can be accurately measured.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings. The convergence adjustment method according to the present invention is a method for measuring and adjusting so-called color convergence in a color cathode ray tube, and is executed by the convergence adjustment device according to the present invention.

As shown in FIG. 1, the convergence adjusting device according to the present invention comprises a color filter as a color separation device and a solid-state image pickup device 3 as a light measuring device. The solid-state imaging device 3 images the display surface of the color cathode ray tube 1 through the color filter and measures the light intensity level distribution over the entire display surface.

The display surface of the color cathode-ray tube 1 is composed of finely divided red phosphors, green phosphors and blue phosphors, and these respective color phosphors are selectively red phosphor and green phosphor. And, by displaying blue fluorescence, an image is displayed.

The color filter 2 comprises a red filter for transmitting red light, a green filter for transmitting green light, and a blue filter for transmitting blue light. The solid-state imaging device 3 includes a solid-state imaging device for red (CCD) that captures the display surface through the red filter, a solid-state imaging device for green that captures the display surface through the green filter, and the solid-state imaging device. It is configured to have three solid-state image pickup elements for blue, which pick up images of the display surface through a blue filter. As the color separation means, a color separation prism or the like can be used instead of the color filter 2.

The red solid-state image pickup device picks up only the red component of the image displayed on the display surface. Similarly, the solid-state image sensor for green has only the green component of the image displayed on the display surface, and the solid-state image sensor for blue has only the blue component of the image displayed on the display surface. , Respectively.

The video signal output from each solid-state image pickup device is sent to the corresponding A / D converter (analog-digital converter) 4R, 4G, 4B. That is, the output signal of the solid-state image pickup device for red color is sent to the A / D converter 4R for red color signal. The output signal of the solid-state image sensor for green color is sent to the green signal A / D converter 4G. Then, the output signal of the solid-state imaging device for blue color is sent to the A / D converter 4B for blue color signal.

Each of the above A / D converters 4R, 4G, 4
Each video signal converted into a digital signal by B is
While being sent to the red signal memory 5R, the green signal memory 5G, and the blue signal memory 5B, which are storage means provided corresponding to the converters 4R, 4G, and 4B,
It is sent to the signal processing device (CPU) 6 which serves as a calculation means.

The signal processing device 6 carries out predetermined signal processing as described later on the basis of the transmitted color signals and the data read from the color signal memories 5R, 5G and 5B. Further, the signal processing device 6 controls the display 7 to perform various displays based on the result of the signal processing. Further, the signal processing device 6 controls the single-color and white-signal generating circuit 8 for displaying a white, red, green, or blue single-color measurement pattern on the color cathode-ray tube 1. As the measurement pattern, a dot pattern or a grid pattern formed of a plurality of dot-like displays is used.

In the convergence adjusting method according to the present invention which is executed in the convergence adjusting apparatus constructed as described above, the crosstalk coefficient is obtained prior to the execution. The crosstalk coefficient is a coefficient indicating a light intensity level at which each color fluorescence on the display surface passes through the color filter 2 and is measured as a component of another color.

That is, as the crosstalk coefficient, C indicating the light intensity level at which the red fluorescence is imaged by the green solid-state image pickup device through the green filter.
_rg , C indicating the light intensity level of the red fluorescence imaged by the blue solid-state image sensor through the blue filter
_rb , C indicating the light intensity level of the green fluorescence imaged by the red solid-state imaging device through the red filter
_gr , C indicating the light intensity level at which the green fluorescence is imaged by the blue solid-state imaging device through the blue filter
_gb , C indicating the light intensity level of the blue fluorescence imaged by the red solid-state image sensor through the red filter
_br , C indicating the light intensity level of the blue fluorescence imaged by the green solid-state image sensor through the green filter
There is _bg .

These crosstalk coefficients are displayed on the display surface of the color cathode-ray tube 1 in the order of the measurement patterns consisting of single colors of red fluorescence, green fluorescence and blue fluorescence, and these measurement patterns are displayed by the solid-state image pickup device 3. It is obtained by imaging. That is, when the red fluorescence measurement pattern is displayed, C _rg is obtained from the green signal and C _rb is obtained from the blue signal. Further, when the green fluorescence measurement pattern is displayed, C _gr is obtained from the red signal and C _gb is obtained from the blue signal. Furthermore, when the blue fluorescence measurement pattern is displayed, C _br is obtained from the red signal,
C _bg is obtained from the green signal.

The above crosstalk coefficients C _rg , C _rb ,
C _gr , C _gb , C _br and C _bg are calculated by the signal processing device 6 and stored in the color signal memories 5R, 5G and 5B.

In the convergence adjustment, the monochromatic and white signal generation circuit 8 displays a white measurement pattern on the display surface of the color cathode ray tube 1. Then, the solid-state imaging device 3 images the measurement pattern via the color filter 2.

At this time, in the green solid-state image pickup device, as shown in FIG. 2, at the positions g _{1 to} g _m on the display surface, the levels G _{1 to} G _m correspond to these positions, respectively. It is measured as a measurement value of the light intensity level distribution corresponding to the brightness level distribution of green fluorescence. At the same time, in this solid-state image pickup device for green, at the positions r _{1 to} r _l on the display surface, the light having levels R _{1 to} R _l corresponding to these positions corresponds to crosstalk due to red fluorescence. It is measured as a measure of the intensity level distribution. further,
In this solid-state image sensor for green, at the positions b _{1 to} b _n on the display surface, the levels B _{1 to} B _n corresponding to these positions are the light intensity level distributions corresponding to the crosstalk due to blue fluorescence. It is measured as a measured value.

Similarly, also in the red solid-state image pickup device and the blue solid-state image pickup device, the luminance level distributions of the red fluorescence and the blue fluorescence are obtained at a plurality of positions on the display surface in correspondence with the respective positions. The corresponding light intensity level distribution is measured. The light intensity level distributions corresponding to the crosstalk due to the fluorescence of other colors are also measured in the red solid-state image pickup device and the blue solid-state image pickup device.

Here, considering the center of gravity of the light intensity distribution measured in the above-mentioned solid-state image pickup device for green color, this is the center of gravity g ′ including the above-mentioned crosstalk components,

[0033]

[Equation 1]

It can be expressed by (Equation 1). Here, the sum of crosstalk components from red fluorescence is R
_C, and the sum of the components of the green fluorescent G, the sum of the components of the cross-talk from the blue fluorescent and B _C, and the center of gravity of the light intensity distribution, respectively r _C, g, When b _C, centroid r _C is,

[0035]

[Equation 2] ········· (Equation 2), the center of gravity g is

[0036]

[Equation 3] ・ ・ ・ ・ ・ ・ ・ ・ ・ (Equation 3), and the center of gravity b _C is

[0037]

[Equation 4] ・ ・ ・ ・ ・ ・ ・ ・ ・ (Formula 4) Substituting these equations 2 to 4 into the above equation 1,

[0038]

[Equation 5] ・ ・ ・ ・ ・ ・ ・ ・ ・ (Formula 5) That is, the light intensity level distribution by crosstalk from red fluorescence, the light intensity level distribution by green fluorescence, and the light intensity level distribution by crosstalk from blue fluorescence as shown in FIG. 2 are as shown in FIG. The level can be regarded as the sum of the respective components and the three components located at the respective centers of gravity.

Here, the sum of the components of the luminance level distribution of red fluorescence which does not include the crosstalk component of fluorescence of other colors is R. Similarly, the sum of the components of the brightness level distribution that does not include the crosstalk component of green fluorescence is G, and the sum of the components of the brightness level distribution that does not include the crosstalk component of blue fluorescence is B. Then, the sum of the components of the light intensity level distribution including the crosstalk component measured for red fluorescence is R ′, the sum of the components of the light intensity level distribution including the crosstalk component measured for green fluorescence is G, and blue If the sum of the components of the light intensity level distribution including the crosstalk component measured for fluorescence is B, then between these R, G, B, R ', G', B ',

[0040]

[Equation 6] ........ (Equation 6) holds. Therefore, the sum R, G, B of the components of the luminance level distribution of each color fluorescence which does not include the crosstalk component is

[0041]

[Equation 7] ・ ・ ・ ・ ・ ・ ・ ・ ・ (Equation 7)

[0042]

[Equation 8] ・ ・ ・ ・ ・ ・ ・ ・ ・ (Equation 8)

[0043]

[Equation 9] ........ can be expressed by (Equation 9).

Then, the center of gravity of the luminance level distribution that does not include the crosstalk component of red fluorescence is different from that of fluorescence of other colors. Similarly, the centroid of the luminance level distribution that does not include the crosstalk component of green fluorescence is g, and the centroid of the luminance level distribution that does not include the crosstalk component of blue fluorescence is b. Further, the centroid of the light intensity level distribution including the crosstalk component measured for red fluorescence is r ′, the centroid of the light intensity level distribution including the crosstalk component measured for green fluorescence is g, and the centroid of the blue fluorescence is measured. If the center of gravity of the light intensity level distribution including the crosstalk component is b, then between these r, g, b, r ', g', b '

[0045]

[Equation 10] ··········· (Equation 10) is established. Therefore, the centroids r, g, b of the luminance level distribution of each color fluorescence not including the crosstalk component are

[0046]

[Equation 11] ・ ・ ・ ・ ・ ・ ・ ・ ・ (Equation 11)

[0047]

[Equation 12] ・ ・ ・ ・ ・ ・ ・ ・ ・ (Equation 12)

[0048]

[Equation 13] .............. (Equation 13) can be shown.

In this way, in this convergence adjustment method, the centers of gravity r, g, and b are found for the luminance level distribution that does not include the crosstalk component of the other colors of the above-mentioned fluorescence of each color.

Then, in this convergence adjusting device, the sum R of the components of the light intensity level distribution including the crosstalk component from the fluorescence of the other colors with respect to each of the above-mentioned fluorescence of each color.
′, G ′, B ′ are measured by the signal processing device 6 via the solid-state imaging device 3. Further, the center of gravity r ′, g ′, b ′ of the light intensity level distribution including the crosstalk component of the fluorescence of each color with respect to the fluorescence of each color is measured by the signal processing device 6 via the solid-state imaging device 3. The signal processing device 6 calculates from the obtained light intensity level distribution.
Also, the sum R of the components of the brightness level distribution that does not include the crosstalk component of the fluorescence of each color with respect to the fluorescence of each color
G and B are calculated by the signal processing device 6 using the above equation 6.

Then, the signal processing device 6 uses the respective crosstalk coefficients, and according to the above equations 11 to 13, the center of gravity of the luminance level distribution not including the crosstalk component of the other colors of the respective color fluorescences. Calculate r, g, b. The signal processing device 6 displays the calculation results of the respective centers of gravity r, g, and b on the display 7.

In the color cathode-ray tube 1, the deflection coils and the like are adjusted so that the center of gravity r, g, b of the brightness level distribution that does not include the crosstalk component of the other colors of the fluorescence of each color.
The adjustment of the color convergence is completed by making the values coincide with each other.

[0053]

As described above, in the convergence adjusting method according to the present invention, when the red fluorescent light, the green fluorescent light and the blue fluorescent light forming the white measurement pattern in the color cathode ray tube pass through the color separation means, they are different from each other. The crosstalk coefficient indicating the light intensity level measured as a color component is measured in advance, and the light intensity of each color component measured through the color separation means of the measurement pattern displayed on the color cathode ray tube. The brightness level distribution of each color fluorescence is calculated using the crosstalk coefficient based on the level distribution.

Further, in the convergence adjusting device according to the present invention, the calculating means is based on the light intensity level distribution of each color component of the white measurement pattern measured by the light measuring means through the color separation means, and the above-mentioned measurement is performed. The brightness level distribution of each color fluorescence is calculated by using the crosstalk coefficient indicating the light intensity level at which each color fluorescence forming the usage pattern is measured as a component of another color, supplied from the storage means.

Therefore, in the convergence adjusting method and the convergence adjusting apparatus, even if the spectral emission characteristics of each color fluorescence and the spectral color separation characteristics of the color separation means do not match, the luminance level distribution of each color fluorescence can be accurately measured. Can be measured.

Therefore, in the convergence adjusting method and the convergence adjusting apparatus, it is not necessary to match or approximate the spectral color separation characteristics of the color separation means to the spectral emission characteristics of each color phosphor.
It is possible to use a color filter which is easy to manufacture and obtain and which is inexpensive.

In the convergence adjusting method and the convergence adjusting apparatus according to the present invention, the brightness level distribution of each color fluorescence can be calculated by simple signal processing. Therefore, a simple calculating apparatus can be used to quickly and quickly. The luminance level distribution of each color fluorescence can be measured with high accuracy.

Furthermore, the crosstalk coefficient can be automatically measured every time the convergence is measured according to the characteristics of the phosphor and the color filter by using the monochromatic signal generator.

That is, the present invention can provide a convergence adjusting method capable of measuring and adjusting color convergence rapidly and with high accuracy using a simple processing device.

Further, the present invention can provide a convergence adjusting device which has a simple device configuration and can perform a quick and highly accurate measurement and adjustment of color convergence.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a convergence adjustment device according to the present invention, which is configured so as to be able to execute a convergence adjustment method according to the present invention.

FIG. 2 is a graph showing a light intensity level distribution of each color component measured by the convergence adjustment method.

FIG. 3 is a graph showing a state in which the light intensity level distribution of each color component measured in the convergence adjustment method is represented by one component for each color.

FIG. 4 is a graph showing the position of the center of gravity of each color component obtained based on the measured values including crosstalk in the convergence adjustment method.

FIG. 5 is a graph showing the barycentric position of each color component obtained by correcting the influence of crosstalk in the convergence adjustment method.

[Explanation of symbols]

 1 ・ ・ ・ ・ ・ ・ ・ ・ ・ Color cathode ray tube 2 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Color filter 3 ・ ・ ・ ・ ・ ・ ・ Solid-state imaging device 5R ・ ・・ ・ ・ ・ ・ ・ ・ ・ Red signal memory 5G ・ ・ ・ ・ ・ ・ ・ ・ Green signal memory 5B ・ ・ ・ ・ ・ ・ ・ ・ Blue signal memory 6 ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ Signal processing device

Claims (2)

[Claims] 1. A color cathode ray tube displays a white measurement pattern composed of red fluorescence, green fluorescence, and blue fluorescence,
Using a color separation means for separating white into red, green and blue, the brightness level distribution for each of these color components of the measurement pattern is measured, and the convergence adjustment method is performed to adjust the color convergence based on the measurement result. The crosstalk coefficient indicating the light intensity level measured as the other color component when each color fluorescence of the measurement pattern passes through the color separation means is measured in advance, and displayed on the color cathode ray tube. Based on the light intensity level distribution of each color component measured through the color separation means of the measured pattern, the crosstalk coefficient is used to calculate the brightness level distribution of the fluorescence of each color. .. 2. A color separation means for decomposing white into red, green and blue, and a white measurement pattern composed of red fluorescence, green fluorescence and blue fluorescence displayed on a color cathode ray tube via the color separation means. The light measuring means for measuring and measuring the light intensity level distribution of each color component decomposed by the color separating means, and the fluorescence of each color when the measuring pattern is measured by the light measuring means via the color separating means. Is stored in the storage means on the basis of a storage means for storing a crosstalk coefficient indicating a light intensity level measured as a component of another color, and a light intensity level distribution of each color component measured by the light measurement means. A convergence adjusting apparatus comprising: a calculating unit that calculates the luminance level distribution of each color fluorescence using a crosstalk coefficient.