JP3275842B2 - Picture tube device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a picture tube device in which a screen is divided into a plurality of areas and each area is scanned by one or more electron guns.

[0002]

2. Description of the Related Art In general, by dividing a screen into a plurality of areas and scanning each area with one or more electron guns, the screen is made thinner and larger than when the entire screen is scanned with one electron gun. be able to. However, when the screen is divided into a plurality of regions, seams between the individual scanning regions are conspicuous, and the entire image is likely to be a divided video.

As a conventional example for solving this problem, there are known (1) Japanese Patent Application Laid-Open No. 8-227279 and (2) Japanese Patent Application Laid-Open No. 8-273555. The conventional example (2) is a method of controlling a beam by an index method. More specifically, in a color display tube using phosphors corresponding to red, green, and blue, an index phosphor different from those is provided on a screen. In this method, a signal is generated, the signal is detected by a detector, the beam position is detected, and the beam position is fed back to the beam deflection to improve the landing accuracy of the beam. In the conventional example (1), a seam of a plurality of small regions that are continuous in a slow scanning direction is set obliquely so that a plurality of scans are connected.

[0004]

However, in an electron beam scanning system using one type of index system,
There is a problem that seams of individual scanning regions cannot be made inconspicuous due to distortion of beam deflection or the like. That is, when the electron beam is deflected, distortion is generated particularly at the peripheral portion of the screen as shown in FIG. 7A, and the central portion is deformed into a concave shape so that the seam between the regions adjacent to each other in the direction perpendicular to the horizontal deflection direction. Stand out. For this reason, a method of providing a plurality of types of indexes has been proposed. However, this method requires a plurality of index detectors and a feedback circuit, so that an increase in the number of parts and an accompanying increase in cost are inevitable. Further, in the conventional example (1), the joints of a plurality of small areas that are continuous in the slow scanning direction are set diagonally.
Beam deflection distortion as shown in FIG. 2B occurs, and the joint cannot be made sufficiently inconspicuous.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to provide a picture tube device that can make the seams of individual scanning areas inconspicuous with a simple and inexpensive configuration.

[0006]

To achieve SUMMARY OF to the above objects, picture tube apparatus according to claim 1, a screen a plurality of regions
And scan each area with one or more electron guns
In a picture tube device, division is made between adjacent areas
Scanning the border so that it moves over time
It is characterized by. The picture tube device according to claim 2 includes a screen.
It is divided into a plurality of areas, and each area is divided by one or more electron guns.
In a picture tube device that scans
One end of one scan line belonging to one and one of the scan lines belonging to the other
The position of the boundary area formed with one end of the scanning line
It is characterized by being changed with excess. According to the picture tube device of the third aspect, the screen is divided into a plurality of areas and the individual areas are divided.
In a picture tube device that scans an area with one or more electron guns
Of one scan line belonging to one of the areas adjacent to each other
Formed by one end and one end of one scan line belonging to the other
A border area and a next scan of the one scan line in the one area
One scan line and the next scan of the one scan line in the other area
Make sure that the boundary area formed with one end of the
While arranging, the position of the boundary area is determined with the passage of time.
The feature is to change both. A picture tube device according to a fourth aspect is characterized in that the regions are vertically adjacent to each other. The picture tube device according to claim 5, wherein the regions are adjacent to each other on the left and right.
It is characterized by.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram showing a scanning method of an embodiment of a picture tube device according to the present invention, and FIG. 2 is an explanatory diagram showing a conventional scanning method.

FIG. 1 shows two scanning areas 1 and 2 adjacent to the left and right by dividing the screen into a plurality of areas. In the present invention, the right end 5 of the scanning line 3 (shown at the top) which is deflected horizontally in the left scanning area 1 and the scanning line 4 (scanning line 3) which is deflected horizontally in the right scanning area 2 (The same line as above), a boundary region 7 formed by a left end 6, a right end 5 ′ of a scan line 3 ′ below the scan line 3 in the left scan region 1, and a scan line 4 below the scan line 4 in the right scan region 2. The scanning is performed by the electron guns of the two scanning regions 1 and 2 so that the boundary region 7 'formed by the left end 6' of the scanning line 4 'is not adjacent, that is, dispersed in the left-right direction.

Similarly, the right end 5 ″ of the scan line 3 ″ below the scan line 3 ′ in the left scan area 1 and the left end 6 ″ of the scan line 4 ″ below the scan line 4 ′ in the right scan area 2 Is formed by the boundary region 7 on it,
Scanning is performed so as not to be adjacent to 7 '.

Here, scanning lines 3, 3 ', 3 ", 4,
4 ′, 4 ″ are white, and the boundary areas 7, 7 ′, 7 ″ are black, and the boundary area 7, 7 ′, 7 ″ in the rectangular area (shown by the left end 8 and the right end 9), When 7 ′ and 7 ″ are dispersed, when viewed macroscopically, the dispersed area between the left end 8 and the right end 9 is observed as a gray straight line extending vertically and having a relatively large width. FIG. 2 shows the boundary regions 7, 7 ',
7 ”shows a case where scanning is performed so that 7” is vertically adjacent,
In this case, the scanning lines 3, 3 ', 3 ", 4,
Assuming that 4 ′ and 4 ″ are white and the boundary areas 7, 7 ′ and 7 ″ are black, the area including all of the boundary areas 7, 7 ′ and 7 ″ is relatively narrow when the screen is viewed macroscopically. Observed as a black straight line.

Here, in FIG. 1, the width L of the dispersion area (8-9) between the left end 8 and the right end 9 and the boundary areas 7, 7 ', 7 "
If the ratio l / L of the width l is set to 5% or less, the change in luminance due to the dispersion region (8 to 9) becomes inconspicuous. That is, the boundary region 7 is set so that the ratio 1 / L becomes 5% or less.
By dispersing 7 ′, 7 ″ in the left-right direction and reducing the beam mislanding in the adjacent area to reduce the boundary area, the seam of each scanning area can be made inconspicuous with a simple and inexpensive configuration. it can.

FIG. 3 shows another example of the first embodiment in which the boundary areas 7, 7 ', 7 "are dispersed at an oblique angle, and the boundary areas 7, 7', 7" are vertically oriented. The method of scanning the boundary areas 7, 7 ', 7 "so that they are not arranged in the same manner is shown.

In the above description, monochrome is taken as an example, but in the case of a color picture tube, there are a type using a shadow mask and a type controlling the beam landing by an index method or the like. Can be considered. Also, the difference in which the luminance can be recognized has been described as 5%, but this depends on the luminance and the peripheral brightness. When the surrounding is relatively bright and the contrast is 100 or less, the above ratio 1 / L is about 10%. But not noticeable. Further, the sensitivity to red and blue is lower than that of green, depending on the color sensitivity of the human eye and the surrounding colors.
It is not noticeable even at about 0%.

FIG. 4 shows a second embodiment in which the scanning is performed so that the boundary areas 7 are vertically adjacent to each other as shown in FIG. 2, that is, in a straight line. 5 shows a method of scanning to move to. That is, the distance from the left end of the left scanning area 1 to the boundary area 7 is D-a1 in the first frame as shown in FIG. 4A, and the next second frame as shown in FIG. D-a2, as shown in FIG. 4 (c), D-a3 in the next third frame, and the next fourth frame as shown in FIG. 4 (d).
In the frame (b), the boundary region 7 extending in the up-down direction moves in the left-right direction for each frame so as to be Da-4. Here, when the distances a1 to an are changed within the range of the width L in the left-right direction with n frames as one unit, similarly, when the ratio l / L of the width L and the width l of the boundary region 7 is set to 5% or less, When the screen is viewed macroscopically, the boundary area 7 is inconspicuous and feels uniform as a whole.

FIG. 5 shows, as a third embodiment, a method of scanning so that the boundary area 7 between the scanning areas 1 and 2 divided in the vertical direction moves in the vertical direction for each frame. That is, the distance from the upper end of the upper scanning area 1 to the boundary area 7 is D'-b1 in the first frame as shown in FIG. 5A, and the second distance as shown in FIG. 5B. In the frame, D'-b2, as shown in FIG.
The boundary region 7 moves up and down for each frame so as to be D'-b3 in the frame No. and D'-b4 in the next fourth frame as shown in FIG. 5D. Similarly, in the case of this embodiment, when changing b1 to bn by the width L ′ in the vertical direction, the ratio l ′ / the width L ′ of the width L ′ and the width l ′ of the boundary region 7 is changed.
When L 'is 5% or less, the boundary region 7 is inconspicuous when the screen is viewed macroscopically, and is felt uniformly as a whole.

FIG. 6 shows the first embodiment (see FIG. 1) and the second embodiment.
6 shows a fourth embodiment in which the first embodiment (see FIG. 4) is combined. The positions of the boundary areas 7 between the two scanning areas 1 and 2 adjacent to each other on the left and right are dispersed in each scanning line.
It moves in the width direction for each frame as shown in (a) to (d).

Similarly, in the case of the fourth embodiment, when the boundary region 7 changes with the width L, the width L and the width l of the boundary region 7 are changed.
When the ratio 1 / L is set to 5% or less, the boundary region 7 is inconspicuous when the screen is viewed macroscopically, and is felt uniformly as a whole. Further, the fourth embodiment can be applied not only to the boundary region 7 between the two scanning regions 1 and 2 adjacent to the left and right, but also to the scanning region adjacent to the vertical and oblique directions. The present invention can be applied to a color picture tube regardless of the presence or absence of an index method, and an index method can be used together. Further, the present invention is effective even when the beam is distorted as shown in FIG. 7, and is particularly effective even when the beam trajectory is greatly distorted since color misregistration does not occur in a picture tube using a shadow mask.

[0018]

As described above, according to the present invention,
Since the boundaries on each scanning line that divides between adjacent areas are dispersed so as not to be adjacent to each other, or the positions are changed for scanning, the seams of the individual scanning areas can be made inconspicuous with a simple and inexpensive configuration. .

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a scanning method of a picture tube device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a conventional scanning method.

FIG. 3 is an explanatory diagram showing a scanning method of a picture tube device according to another example of the first embodiment.

FIG. 4 is an explanatory diagram showing a scanning method of the picture tube device of the second embodiment.

FIG. 5 is an explanatory diagram illustrating a scanning method of a picture tube device according to a third embodiment.

FIG. 6 is an explanatory diagram illustrating a scanning method of a picture tube device according to a fourth embodiment.

FIG. 7 is an explanatory diagram showing beam distortion in a conventional example.

[Explanation of symbols]

 1,2 scanning area 3,3 ', 3 ", 4,4', 4" scanning line 7,7 ', 7 "boundary area

Continuation of front page (58) Fields investigated (Int.Cl. ⁷ , DB name) G09G 1/20 H01J 31/00 H04N 5/66-5/74

Claims (5)

(57) [Claims] 1. A screen is divided into a plurality of areas and
To a picture tube device that scans an area with one or more electron guns.
And the boundaries dividing adjacent areas
Receiving means for scanning so as to move over time
Picture tube device. 2. The screen is divided into a plurality of regions and
To a picture tube device that scans an area with one or more electron guns.
And one scanning line belonging to one of the areas adjacent to each other
And one end of one scan line belonging to the other
To change the position of the boundary area over time.
A picture tube device characterized by the following. 3. The screen is divided into a plurality of areas and individually divided.
To a picture tube device that scans an area with one or more electron guns.
And one scanning line belonging to one of the areas adjacent to each other
And one end of one scan line belonging to the other
Next to the one scanning line of the one area
One end of the scanning line and the next of the one scanning line in the other area
Make sure that the boundary area formed with one end of the scanning line does not adjoin
And the position of the boundary area is changed over time.
A picture tube device characterized by being changed together. 4. The method according to claim 1, wherein the regions are vertically adjacent to each other.
The picture tube device according to any one of claims 1 to 3. 5. The method according to claim 1, wherein the areas are adjacent to each other on the left and right.
The picture tube device according to any one of claims 1 to 3.