JPS5837650B2 - Color display panel display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an in-line color picture tube panel printing apparatus that eliminates the need for dynamic convergence, and particularly relates to simultaneous exposure of black matrices for three colors.

According to recent new technology, the combination of an in-line special electron gun and a special deflection yoke eliminates the need for dynamic convergence, which cannot be eliminated with conventional color picture tubes.

By the way, it has been found that the new type of in-line color picture tube has the following characteristics as compared to conventional ones that require dynamic convergence.

Figure 1 is an enlarged view of a part of the striped phosphor screen seen from the face plate side of the front panel 1 of an in-line color picture tube, and shows the relationship between the three in-line electron guns and how to take coordinates. This is a diagram.

That is, the longitudinal direction of the face plate of an in-line color picture tube having a rectangular screen is the X axis, the direction perpendicular to this is the y axis, and the center axis (tube axis) of the face plate is the two axes.

As shown in Figure 1 of the electron gun, the red gun is the tube axis, and the blue gun is -X.
The green gun is also separated by the amount SBymx in the +X direction on the deflection center plane.

In this S, the amount of S B irt is, for example, 14 type (1
In a Guinamiku convergence-free tube with a 9CP deflection (4 inches), it is about 3.80 +++ m.

Next, the S direction of the blue and green electron guns will be defined. For the blue electron gun, the -\ direction is the +S direction, and for the green electron gun, the +X direction is the +S direction.

The landing characteristic of the conventional dynamic convergence device is that in order to match the electron beam deflected toward the periphery of the screen with the phosphor, the position of the blue light source when printing the phosphor must be set at the above distance S B A correction is required to move the light source further by ΔS in the +S direction of the light source arrangement direction from the position that is away by vtirt.

Similarly, regarding the position of the green light source, blue and white light sources are placed in the +S direction.
゛It was necessary to correct the same amount of △S.

Figure 2A is a diagram for explaining the above.
R, LQ are the light sources on the actual exposure table, and LBl, LGl
shows an apparent light source that has been corrected by ΔS1 on an exposure table for printing the corresponding phosphor when the electron beam scans the periphery of the screen.

Here l1 is l1=△S1+SB+SB+△S1-4io+2△S1
? , an apparent light source L B'+ L for both side beams (blue and green) with respect to the central beam red at the periphery of the screen
Indicates the length between G'.

It has been found that the characteristics of the landing characteristics of both tubes with and without dynamic convergence are summarized as follows.

For side beams with △S9o-l-1
~1.5 h, △S t t = +2 ~3 mm
, and for side beams when unnecessary, △S,
.

0.15 to +0.2, △Sll.

It is about 20.6 to 0.7 ho.

Here, △S901△S IIQ is the apparent △S value of the light source on the deflection center plane required when deflecting toward the periphery of the screen of the 90° deflection tube and the 110° deflection tube, respectively.

In other words, (△S when present)》 (△S when unnecessary)
Because of this relationship, the need for ΔS correction was lower in cases where dynamic convergence was not required than in cases where dynamic convergence was present.

Moreover, 90' when dynamic convergence is not required
For color picture tubes with smaller deflection angles, △
The value of S is smaller than the above-mentioned △S90 and can be almost ignored. Therefore, in the process of making a black matrix, one sheet is required to make matrix holes (stripe) for blue, red, and green. It is possible to print simultaneously with three light sources using a common correction lens.

However, even for devices that do not require dynamic convergence, in the case of 110° deflection, etc., a △S of 0.6 to 0.7 is required, so it is difficult to avoid changes in the shadow mask over time, the influence of geomagnetism, etc. If you think about it, just like in a color picture tube with a deflection angle smaller than 90°, if you ignore the △S component, the resulting riding error (the deviation from the beam center will significantly affect the white uniformity) .

Figure 6 shows △ on the screen of the 18-inch 1100 deflection tube.
Indicates the amount of S.

In the figure, the length of the line in the +X direction with respect to the y-axis indicates the amount of △S of the blue light source, and the length of the line in the 1X direction with respect to the y-axis indicates the amount of △S of the green light source. It shows the amount of

In addition, the figure shows △S on the screen, and +X on the screen
ΔS in the axial direction corresponds to ΔS in the -X direction on the light source side, and ΔS on the screen is 1/20 of ΔS on the light source side.

In other words, in a color picture tube with a deflection angle of 90 degrees or more that does not require dynamic convergence, if you try to print black markers for blue, red, and green at the same time using three light sources, The correction lens for aligning the center of the electron beam and the center of the phosphor is placed between the pair of panel masks to be printed and the light source, so the correction lens is almost the same for blue, red, and green. optical system.

That is, the effect of the correction lens is that the amount of correction is almost the same for blue, red, and green.

Therefore, the required correction amount ΔS of the side beam (blue, green) light source must be corrected in the light source section.

Figure 2B shows the landing state of a tube that does not require dynamic convergence and has a phosphor screen formed by the conventional exposure method. The red and green phosphor stripes, BB, RB, and GB are the blue, red, and blue stripes on the screen that have passed through one hole in the shadow mask, respectively.
The green beam section is shown.

In the case of Fig. 2B, the only correction lens used is one that reduces the red landing error to O, so △S1 in Fig. 2A is not corrected, so the landing error for blue and green is not corrected. Errors occur or are likely to occur.

In other words, since blue and green are not corrected in the part shown in the figure, the blue, red, and green trio (BB, RB, G) of the electron beam is
Compared to B), the trio of phosphors (BS, RS, GS) is in the direction of the so-called grouping/grouping.

That is, since a certain portion of the blue and green ΔS is printed without being corrected, this landing error occurs or is likely to occur.

Additionally, the advantages of printing the black matrices for three colors at the same time are that the exposure time is reduced to 1/3, the number of exposure devices is reduced, and the maintenance of the exposure devices is easy. The cost of manufacturing one face plate can be reduced.

This invention was made in view of the above points, and is a panel printing device that can correct the △S component of multiple colors when scanning around a tube that does not require dynamic convergence (the deflection angle is large) using a common optical system. It provides:

The panel printing apparatus of the present invention uses the same optical system to print three light sources simultaneously or sequentially in order to create a black matrix phosphor screen, so that the distance between the light sources in FIG. 2A is Conventionally, the irradiation position was constant regardless of whether it was around the periphery of the panel or near the center. This device is characterized by a correction lens that increases the apparent distance between the three light sources in the direction in which the light sources are arranged, and is arranged close to the three light sources. It is possible to increase the margin of landing error of an in-line color picture tube that does not require dynamic convergence and has a deflection angle of .

Before explaining this invention, the operation of the conventional exposure method will be explained with reference to FIG.

FIG. 3 is an enlarged view of a light source used in conventional black matrix IJ printing.

LB, LR, and LG are light sources for printing blue, red, and green matrices, respectively; for example, IK of an ultra-high pressure mercury lamp.
It belonged to W.

A flowing water layer 2 surrounds these light sources.

The flowing water layer 2 and the air are separated by, for example, a flat optical glass window 3 having a thickness of 3+i+.

Since the refractive index of the optical glass of the flowing water layer 2 and the optical glass window 3 is almost the same, when considering the refractive index of light,
I will explain this using a diagram showing refraction only on surfaces that are in contact with air.

In FIG. 3, θ1 corresponds to the deflection angle, and the light sources LB, L
There is actually a difference in deflection angle between R and LG, but this S
Since the value of SB is small and the distance from these light sources to the pair of panel masks is sufficiently long compared to SB, the difference in deflection angle is less than 1° at the outer periphery, which can be considered to be almost the same.

In addition, from now on, Shadow Mask 1? The deflection angle with respect to the through hole is represented by the deflection angle of the central light source LR.

Thus, according to the conventional exposure method, when θ1-O, l1-lo=SB+SB.

On the other hand, when θ1 becomes large, that is, θ
The light at an angle of 2 is refracted and travels at an angle of θ1.

Considering this in terms of the arrangement direction of the light sources on the real light source plane P, the apparent light source deviates from the real light source by ΔS2.

This relationship can be considered to be exactly the same for each of the LB, LR, and LG light sources.

That is, in this case, each light source appears to have moved by the same amount in parallel.

Therefore, in this case as well, it can be approximated as l1=lo.

4 and 5 are a diagram of the vicinity of the light source and an overall diagram for explaining an embodiment of the present invention, in which 1 is a front panel, 2 is a flowing water layer, 4 is a first correction lens, and 5 is a plurality of a second one to correct common landing errors of light and multiple electron beams;
correction lens, 6 is a shadow mask, 7 is front panel 1
and a support for the first correction lens 4, and 8 are light sources LB and LR.
, LG holding stand.

The first correction lens 4 has an outer surface curved toward the front panel 1, and is made of optical glass having a cylindrical curved surface.

According to the structure shown in this figure, the deflection angle of the light source LR is θ1 with respect to one through hole of the shadow mask 6, as in FIG.
In this case, the deflection angles for the light sources LB and LG are θ1+Δθ2 and θ1−Δθ3, respectively.

Here, assuming that the refractive index for the light source LB is about the same as that shown in Figure 3, the position of the light source LB moves by tenon ΔS2 in the light source arrangement direction on the actual light source plane P, and the position of the light source LB shifts to the light source LR. On the other hand, since the refraction angle is steep, the amount of deflection is small, and the position of the light source LR moves by ΔS3, which is smaller than ΔS2.

Further, the refraction angle for the light source LG is steeper than that for the light sources LB and LR, that is, the light source is closer to perpendicular to the exit surface of the first correction lens 4, so the amount of movement of the light source LG due to refraction ΔS4 becomes smaller than ΔS3.

Note that when the light source is perpendicular to the exit surface of the first correction lens 4, ΔS410, that is, the apparent light source does not move in line with the actual light source.

So in this case Thus, the purpose is achieved.

As can be seen from the above, a decrease in the deflection angle θ1 means that the light source becomes closer to perpendicular to the exit surface of the first correction lens, so the amount of refraction decreases and the apparent movement of the light source decreases. quantity decreases.

This is common to each of the light sources T, B, LR, T, and G, and the difference in their deflection angles △θ
2. Since △θ3 is small, the apparent movement amount of the light source, △S, becomes smaller as the deflection angle becomes smaller.
The distance between the apparent light source of the light source LB and the apparent light source of the light source LG, which is considered a problem here, is smaller than l2.

In this way, the first correction lens 4 controls the apparent light sources of the light from each light source so that the smaller the deflection angle, the smaller the apparent distance between the light sources.

In this case, if the actual light sources are placed so that lo-28B is obtained, when the deflection angle θt of the light source LR is Q, the apparent light source of the light from each light source LB and LG is moves in the direction in which the light sources are arranged on the real light source surface P, and the apparent distance between the light sources is l.

'-2 8 B + 2 ΔS5, so in reality, the value of SB of the real light source is reduced by that amount, so that the apparent light source becomes l in the arrangement direction of the light sources on the real light source surface P.

’-28B.

In implementation, the light source system is set so that the distance l2 becomes the desired value as described above, and the landing between the central red electron beam and the red phosphor is adjusted as shown in Figure 5. A single second correction lens 5 is designed to commonly correct the direction of the three colors of light so that the error is O, and in the case of actual exposure, the above-mentioned second correction lens 5 is installed between the tenons of the light source top panel mask pair. Two correction lenses are arranged, and black matrix holes (stripe) for three colors (blue, red, green) are printed simultaneously or sequentially.

By using such an exposure apparatus, even if the same optical system is used, it is possible to make red mislanding 0 and increase the latitude to make blue and green mislanding almost 0 as well.

In addition, in the above explanation, the case where the first correction lens 4 was constructed of optical glass having a cylindrical surface was explained.
For color picture tubes, which have a band-shaped screen printed on a shadow mask with slot holes, you only need to pay attention to the landing characteristics in one direction, so it is possible to achieve the same effect by using, for example, a hemispherical lens. You can have it.

In addition, in FIG. 4, the first correction lens 4 is shown as a flat glass bent into a cylindrical shape, but in actual implementation, a cylindrical lens may be used instead of the optical glass bent into a flat plate. It goes without saying that the cylindrical lens described above may be placed farther away from the flat optical glass window 3 of FIG. 3 toward the front panel 1 of the color picture tube.

As explained in detail above, the present invention provides an apparatus for printing a black matrix on an in-line color picture tube panel. Since the first correction lens has such optical characteristics, it is possible to easily print black I-IJ marks on an in-line color picture tube panel that does not cause landing errors and does not require dynamic convergence. There are advantages.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the phosphor screen structure of a tube that does not require dynamic convergence, the arrangement of electron guns, and how to determine the coordinates. Figure 2A
, B is an explanatory diagram of the landing characteristics of a tube that does not require dynamic convergence, FIG. 3 is a diagram explaining the effect of the conventional exposure method, FIG. FIG. 3 is a diagram showing the amount of ΔS on the screen of an inch 110° deflection tube. In the figure, 1 is the front panel of the color picture tube, 2 is the flowing water layer, and 4 is the front panel of the color picture tube.
is the first correction lens, 5 is the second correction lens, 6 is the shadow mask, and LB, LR, and LG are the blue, red, and green lenses.
This is a light source for burning IJ holes. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. In a panel printing device for an in-line color picture tube that does not require dynamic convergence, and is equipped with a front panel, a shadow mask having a large number of through holes arranged opposite to each other on the inner surface of the front panel, and an in-line 3-electron gun. , three light sources arranged substantially in a line and exposing the inner surface of the panel through the through holes of the shadow mask; The optical path is corrected so that the apparent distance between the light sources in the direction in which the light sources are arranged is longer than the apparent distance between the light sources in the direction in which the light sources are arranged when viewed from near the center of the front panel. a first correction lens, which is disposed between the first correction lens and the shadow mask, and which commonly corrects the light from each light source to match the lanoding position and the exposure position of the electron beam; 2
An in-line type color picture tube panel printing apparatus characterized in that a black matrix for three colors can be shaped by one exposure by providing a correction lens.