JPH11175000A - Slit defect countermeasure structure of color display element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a slit defect inconspicuous while maintaining the maximum aperture rate of the color zone of a color display body by making the color zone narrow for light colors and wide for dark colors. SOLUTION: The widths Y(yellow) and W(white) of color zones of light colors are made narrower than the widths M(magenta) and C(cyan) of color zones of dark colors. A defect of a slit is conspicuous when a light color appears by a dark color and nearly inconspicuous in reverse cases. The stop position of a stepping motor has an error about its determined accurate position to some extent, so the widths of wide color zones including the range of the error are set to M and C and then light colors Y and W never appear by them as defects of slits. When, however, Y and W come to front positions, M and C are seen on both the sides of the color zones, but they are darker than the light Y and W, so area seen in a slit shape is small and nearly inconspicuous.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen comprising a plurality of color display elements each having a color display element which is painted in multiple colors, and rotating and stopping each color display element with a stepping motor for display. The present invention relates to a multicolor display device that switches information such as characters and pictures at a speed of several tens of frames per second by switching colors to be displayed as a moving image.

[0002]

2. Description of the Related Art The applicant of the present invention has previously disclosed a Japanese Utility Model Application Laid-Open No. 5-90.
No. 549 proposes a multicolor display device. In that proposal, masks are set up on both sides of one color band of the color display so that only one color of the color display whose surface is divided into multicolored color bands can be seen from the front position. The color of the pixel constituted by the color display is switched by the rotation of, and characters and pictures are displayed as moving images. The distance between the masks on both sides of the front of the color display is set to the same dimension as the width of the color band of the color display, and each color band is also set to the same width.
The configuration was such that the area of the color band visible from between the masks was maximized.

[0003]

However, there is an error in the stop position due to the rotation of the stepping operation of the stepping motor, and the width and position of the color band of the color display body and the interval and position of the mask are also different in manufacturing. Due to the variation, the gap between the stop position of the color display body and the mask is relatively shifted, and there are many slit defects in the conventional multicolor display device in which the adjacent color band looks like a slit from between the masks. Was. The present invention provides means for making the above-mentioned slit defects inconspicuous.

[0004]

According to the present invention, in order to solve the above-mentioned slit defect, a magnet is fixed to a rotating shaft center of a cylindrical color display body whose surface is painted in a multicolored color band. A stator that freely supports and surrounds the magnet, a magnetic core magnetically coupled to the stator and vertically holding the stator, a coil wound around the magnetic core, and a ground plate magnetically coupled to the magnetic core and vertically holding the magnetic core A color display element that constitutes a motor and has a structure in which a color indicator covers a stator and a coil and rotates on a ground plate. The color indicator is arranged vertically on both sides of the front of the color indicator, and a specified color band of the color indicator is displayed on the front. The width of each color band is configured to be narrow for a bright color and wide for a dark color. In addition, a slit-shaped division band is provided at the boundary of each color band, and the end of the mask is set inside the width of the division band, or the color of the division band is constituted by the same color as the mask. , Or a mixed color of adjacent color bands, or a transition color that gradually changes from one color of the adjacent color band to another color. Also, by making the colors of the color bands adjacent to each other primary colors only in the center of each color band and gradually changing colors, it is possible to remove the masks on both sides, or conversely, the width of the color band is The slit defect is also solved by means of a normal configuration such as making the interval between the masks on both sides narrower than the width of the color band.

[0005]

FIG. 6 is an exploded perspective view of a conventional color display element constituting a display screen of a multicolor display device. The magnetic material base plate 8 is provided with four magnetic cores 12 having fitting holes 11.
The coil bobbins 14 are arranged so as to cover the respective magnetic cores 12 by press-fitting the magnetic cores 12, and the coils 16 are wound around the surfaces of the respective coil bobbins 14, and the coils 16 are wound around the magnetic cores 12.
The coil terminals 18 at the lower end are respectively provided with the slots 15 of the base plate 8.
And is connected to the circuit board 20. At the upper ends of the four magnetic cores 12, one magnetic material stator 22 is connected to each magnetic core 12, and the stator 22 is separated by a stator gap 24 which is four gaps between the stators 22. Are separated. The rotation axis of the color display body 26 whose cylindrical surface is divided into four colors is located on the rotation shaft 32 integrally formed at the center of the inside of the color display body, and the lower end of the rotation shaft 32 is a stator holding the stator. Through hole 23 of frame 23
The color display 26 is disposed so as to cover the magnetic core 12, the coil bobbin 14, the coil 16, the stator 22, and the stator frame 23 so as to be freely rotatable by being fitted into a hole 13 formed in the base plate 8 passing through a. . The magnet 28 fixed to the concave portion 31 of the color display 26 is magnetized in the diameter direction,
The step motor is located in a space surrounded by the magnet 2 with the magnet gap 29 therebetween. The drive signal of the step motor is
The mask 1 is applied from each coil terminal 18, rotates the color display 26 to a specified angle, and bends the base plate 8 vertically.
The designated color band is exposed from between 0a, 10b and 10c. The part of the step motor and the color display 26 is referred to as a color display element 30 as one set.
A device in which a large number of such color display elements 30 are arranged in a matrix is referred to as a multicolor display device. In this embodiment, two color display elements will be described.

FIG. 7 is an explanatory view of a conventional system showing a positional relationship between a color display and a mask. FIG. 7A shows an expanded color band on the outer surface of the color display 26 described with reference to FIG. The color bands of this embodiment are M (magenta), Y
(Yellow), C (cyan), and W (white). The periphery of the outer surface of the color display 26 is divided into four equal parts.

FIG. 7B is a top view of the color display element 30 described with reference to FIG. Masks 10a, 10b, 10c
Are arranged such that only one color band is exposed at the front position, and when the color display bodies 26a and 26b are rotated in a step operation, the respective color bands appear one after another at the front position. The intervals between the masks 10a, 10b, and 10c are matched with the width of the color band in order to make the area where the color band can be seen as large as possible. However, at the stop position of the step motor,
In general, there is a slight variation, and there is a case where the color band C (cyan) shifts to the left as shown in the right color display 26b, but the color band C (cyan) may stop accurately. On the contrary, it may shift to the right. Mask 10
The widths of the masks a and 10b are determined by the pitch at which the color display bodies 26a and 26b are arranged. The pitch is the center-to-center distance between vertically and horizontally adjacent color displays. In the present embodiment, the description will be given only of the horizontal pitch. The pitch and the width of the color band affect the aperture ratio of the multicolor display device, and the aperture ratio will be described with reference to FIG.

FIG. 7 (c) is a front view of FIG. 7 (b). The color display 26a has the mask 1 because the stop position is accurate.
Only the color band C (cyan) can be seen from between 0b and 10c, but the color display 26b is rotated too far to the left, and a bright color band W (white) is seen beside the mask 10a, Has a defect. Hereinafter, the present invention for preventing a slit defect will be described.

FIG. 1 is an explanatory diagram of a first embodiment of the present invention showing a positional relationship between a color display and a mask. FIG. 1 (a)
Is configured such that the widths Y (yellow) and W (white) of the light color band are narrower than the widths M (magenta) and C (cyan) of the dark color band. A slit defect is conspicuous when a bright color appears beside a dark color, and vice versa. Since the stop position of the step motor as in this configuration causes a certain error with respect to the determined accurate stop position, the width of a wide color band including the error range is set to M (magenta), C (magenta), and C (magenta). If it is set to (cyan), bright colors Y (yellow) and W (white) do not appear as slit defects beside it. However, when Y (yellow) and W (white) come to the front position, M (magenta) and C (color) on both sides of the color band.
(Cyan) will be visible, but they are bright Y
(Yellow), darker than W (white),
The area that looks like a slit is small and hardly noticeable.
Further, by setting the mask color to black, the contrast ratio of the brightness with the color of the color band can be increased, and when the color of the slit defect appearing beside the mask is M (magenta) or C (cyan), It becomes almost inconspicuous assimilated to the black color of the mask.

FIG. 1B is a top view in which the color band of FIG. 1A is wound around a color display. The color band C (cyan) of the left color display body 26a is within the interval between the masks 10b and 10c even if the stop position of the stepping motor is shifted, and no slit defect occurs. However, the color band W (white) of the color display body 26b on the right side has the right end inside the mask 10a so that M (magenta) can be seen, causing a slit defect.

FIG. 1C is a front view of FIG. 1B. The color display 26a has no slit defect, but the color display 26b has M (magenta) visible as a slit defect beside the mask 10a. However, as described above, W (white) has a bright and large area and M
(Magenta) has a dark and small area, and it has been experimentally confirmed that a slit defect is hardly recognized in such a state. Therefore, the above-described method has an effect of absorbing the error of the stop position of the step motor and making the slit defect inconspicuous, while keeping the area where the color band can be seen to the maximum.

FIG. 2 is an explanatory diagram of a second embodiment of the present invention showing a positional relationship between a color display and a mask. In FIG. 2A, the width of each color band is slightly reduced, and division bands 40a to 40d are provided at boundaries between adjacent color bands. Division 40
The widths a to d are set within the error range of the stop position of the step motor described with reference to FIG. Therefore, when the stop position is shifted, the divisional bands 40a to 40d can be seen from the front position. However, if the color of the divisional bands 40a to 40d is configured to be the same color as that of the mask, it will not be noticeable as a slit defect.

FIG. 2B is a top view in which the color band of FIG. 2A is wound around a color display. In the color band C (cyan) of the left color display 26a, the stop position of the step motor is normal, and no slit defect occurs. The interval between the two masks 10b and 10c is set to be the same as the width of the color band. However, the color band C (cyan) of the color display body 26b on the right side
Indicates that the right end thereof is shifted from the left side of the mask 10a,
0a is visible, and a slit defect has occurred.

FIG. 2C is a front view of FIG. 2B. Mask 1 disposed on both sides of color display bodies 26a and 26b
0a, 10b, 10c each end 17a-d
When the stepping motor is at the normal stop position, it is set to match the width of the color band. The color display 26a has no slit defect, but the color display 26b has the division 4
0a is seen beside the mask 10a as a slit defect. However, as described above, if the colors of the divided bands 40a to 40d are configured with the same color black as that of the mask, they will not be conspicuous as slit defects. In the case of this method, the range of the error of the stop position of the step motor can be absorbed by the width of the section band. Although the area where the color band can be seen becomes small when the divided band is present, it is improved more than the case where a bright color is seen due to the slit defect.

FIG. 3 is an explanatory view of a color band of a color display according to a third embodiment of the present invention. In FIG. 3A, the colors of the divided bands in FIG. 2A are constituted by mixed colors of color bands adjacent to the divided bands. As shown in the figure, the section 40e is C (cyan).
CW (cyan white) which is an intermediate color between W (white) and M (magenta)
(White magenta) which is an intermediate color of
g is an intermediate color between M (magenta) and Y (yellow)
Y (magenta yellow), 40h is Y (yellow) and C
(Cyan), which is an intermediate color of YC (yellow cyan). When the same mask configuration as described with reference to FIG. 2 is applied to this method, the black color of the divisional band 40a in FIG.
This area corresponds to the CW (cyan white) of the divisional band 40e in the drawing, and the area of the color band exposed from between the masks 10a and 10b increases accordingly. The color of the slit defect is not correct because it is not all C (cyan),
All are better than bright slit defects in W (white).

FIG. 3 (b) shows the color of the divided band in FIG. 2 (a) constituted by a transition color which gradually changes from one color of the color band adjacent to the divided band to another color. As shown in the drawing, the dividing band 40j gradually changes from C (cyan) to W (white), the dividing band 40k gradually changes from W (white) to M (magenta), and the dividing band 40l is M (magenta). To Y (yellow)
The section 40m is composed of a color that gradually changes from Y (yellow) to C (cyan). When the same mask configuration as that described with reference to FIG. 2 is applied to this method, the black color of the divisional band 40a in FIG. 2C gradually changes from C (cyan) to W (white) in the divisional band 40j of FIG. And the masks 10a and 10b
The area of the color band exposed from between becomes larger accordingly. Since the slit defect portion is not all C (cyan), the color is not correct. However, as the stop position error of the stepping motor is smaller, the color is closer to C (cyan).

FIG. 4 is an explanatory view of a color band of a color display according to a fourth embodiment of the present invention. In this figure, there is no clear boundary for the color band, and the center of the color band is the primary color for all four colors M (magenta), Y (yellow), C (cyan), and W (white). The colors are arranged so that the color gradually changes from the part to the adjacent primary color. In the figure, the color change is shown in steps with small divisions 40p to s, but it is also possible to change the divisions further smaller or the color in a stepless manner. When the same mask configuration as that described with reference to FIG. 2 is applied to this embodiment, the black color of the divisional band 40a in FIG. 2C corresponds to the CW (cyan white) of the divisional band 40p in FIG. The color composition of the color band exposed from between the two masks is as follows: C (cyan) at the center, YC (yellow cyan) from the center to the left, and CW (cyan) from the center to the right. (White). Therefore, there is no clear boundary between adjacent color bands, and in this method, the interval between masks set on both sides of the color display described in FIG. 2 is expanded to the full diameter of the color display, or the mask is completely removed. Is also possible. As the distance between the two masks increases, the area of the color band exposed at the front position increases, and the aperture ratio improves. As described in FIG. 7, the aperture ratio is defined by an area ratio determined by the product of the width × height of one color band exposed from the mask and the vertical and horizontal pitches between adjacent color displays. As the size is larger, the brightness of the screen of the entire multicolor display device is improved. In the present system, since the width of the color band and the width of the mask are configured as the horizontal pitch of one pixel, an image having a color tone slightly different from the color signal data of the original image is obtained because the color band is not a primary color. However, this method, in which a difference in color tone is hardly recognized for a general image having many intermediate colors, there is no slit defect, and the aperture ratio is improved, is very effective.

FIG. 5 is an explanatory diagram of a fifth embodiment of the present invention showing the positional relationship between a color display and a mask. FIG. 5 (a)
Are M (magenta), Y (yellow), C (cyan),
The width of the W (white) color band is set at equal intervals.
FIG. 5B is a top view in which the color band of FIG. 5A is wrapped around a color display. The intervals between the masks 10a, 10b, and 10c are set to be narrower than the width of the color band, so that variations in the stop position of the step motor can be tolerated. The color band C (cyan) of the left color display 26a is when the stop position of the step motor is normal. In the case of the color display body 26b on the right side, the color band C (cyan) is rotated too far to the left, but the position of the end portion 17a of the mask 10a is shown in FIG.
Since it extends slightly to the left from the position of the end 17a, no slit defect occurs.

FIG. 5C is a front view of FIG. 5B. The intervals between the masks 10a, 10b, and 10c are set to be narrower than those in FIG. 1C, so that only the designated color band appears at the front position even if the stop position of the color display is shifted. I have. The aperture ratio is smaller than in FIG.
In the case of the present embodiment, the color signal data of the original image is suitable for an animation image or a character advertisement mainly composed of the primary colors. Each has an effect that a slit image and a color other than the primary color do not appear and a clear image can be seen.

[0020]

As described above, according to the method of the present invention, the width of the color band of the color display is narrower for light colors and wider for dark colors, or the color of each color band is changed to the color of an adjacent color band. For example, to change gradually, to set a division band at the border of the color band, and to configure the color of the division band with black or mixed color, or to set the mask interval in a range that can absorb the error of the stop position of the step motor The slit defect can be made inconspicuous while maintaining the aperture ratio of the color band to the maximum by means such as the following. Each of the above-mentioned means is used properly depending on a video having many intermediate colors, an animation, a character advertisement, or a viewing position, and the visual effect can be further improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a first embodiment of the present invention showing a positional relationship between a color display and a mask.

FIG. 2 is an explanatory diagram of a second embodiment of the present invention showing a positional relationship between a color display and a mask.

FIG. 3 is an explanatory diagram of a color band of a color display according to a third embodiment of the present invention.

FIG. 4 is an explanatory diagram of a color band of a color display according to a fourth embodiment of the present invention.

FIG. 5 is an explanatory diagram of a fifth embodiment of the present invention showing a positional relationship between a color display and a mask.

FIG. 6 is an exploded perspective view of a conventional color display element constituting a display screen of a multicolor display device.

FIG. 7 is an explanatory diagram of a conventional method showing a positional relationship between a color display body and a mask.

[Explanation of symbols]

 8 Base plate 10a-c Mask 12 Magnetic core 16 Coil 22 Stator 26a, b Color display 28 Magnet 30 Color display element 40a-s Sectional band

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Junichi Shimoyamada 5-6-112 Maeharacho, Koganei-shi, Tokyo Co., Ltd. Inside the T.I.C. Citizen Koganei Plant (72) Inventor Yoshihiko Yanagawa, Tokorozawa, Saitama 840 Takeno, Shimotomi, Citizen Watch Co., Ltd.

Claims (8)

[Claims] 1. A stator that is rotatably supported by fixing a magnet to a rotation axis of a cylindrical color display body whose surface is painted in a multicolored color band, and a stator that surrounds the magnet and is magnetically coupled to the stator. A step motor is constituted by a magnetic core that holds the magnetic core vertically, a coil wound around the magnetic core, and a base plate that is magnetically coupled to the magnetic core and holds the magnetic core vertically, and the color display body covers the stator and the coil. A color display element having a structure that rotates on the main plate, and a mask disposed on both sides of the front of the color display body and exposing a designated color band to the front position. A structure for preventing a slit defect of a color display element, wherein a width of a light color band is narrower than a width of a dark color band. 2. A stator which is rotatably supported by fixing a magnet to a rotating shaft core of a cylindrical color display body whose surface is painted in a multicolored color band, and a stator which surrounds the magnet and which is magnetically coupled to the stator. A step motor is constituted by a magnetic core that holds the magnetic core vertically, a coil wound around the magnetic core, and a base plate that is magnetically coupled to the magnetic core and holds the magnetic core vertically, and the color display body covers the stator and the coil. A color display element having a structure rotating on the ground plate, wherein the color arrangement of the color band of the color display body is a primary color in a central portion of one color band and another adjacent color band. Characterized in that the color difference between the two primary colors and the other primary colors is gradually changed between the two primary colors. 3. In addition to the slit defect countermeasure structure of the color display element according to claim 2, a mask is provided on both sides of the front surface of the color display body and exposes a designated color band at the front position. Slit defect countermeasure structure of color display element characterized by the following. 4. A stator which is rotatably supported by fixing a magnet to a rotation axis of a cylindrical color display body whose surface is divided into multicolored color bands, and a stator which surrounds the magnet and which is magnetically coupled to the stator. A step motor is constituted by a magnetic core that holds the magnetic core vertically, a coil wound around the magnetic core, and a base plate that is magnetically coupled to the magnetic core and holds the magnetic core vertically, and the color display body covers the stator and the coil. A color display element having a structure that rotates on the main plate, and a mask disposed on both sides of the front of the color display body and exposing a designated color band to the front position. A color display element, wherein slit-shaped divisional bands are provided at respective boundaries, and the ends of two masks arranged on both sides of one color band are set inside the width of each of the divisional bands. Slit defect prevention structure. 5. The structure according to claim 4, wherein the color of the slit-shaped divisional band is the same as the color of the mask. 6. The structure for preventing a slit defect of a color display element according to claim 4, wherein the color of the slit-shaped divisional band is constituted by a mixture of colors of color bands adjacent to the divisional band. . 7. The color of the slit-shaped divisional band is formed by a transition color that gradually changes from one color of the color band adjacent to both sides of the divisional band to another color band. 5. The structure for preventing a slit defect of the color display element according to 4. 8. A stator which is rotatably supported by fixing a magnet to a rotating shaft core of a cylindrical color display body whose surface is painted in a multicolored color band, and a stator which surrounds the magnet and which is magnetically coupled to the stator. A step motor is constituted by a magnetic core that holds the magnetic core vertically, a coil wound around the magnetic core, and a base plate that is magnetically coupled to the magnetic core and holds the magnetic core vertically, and the color display body covers the stator and the coil. A color display element having a structure that rotates on the main plate, and a mask disposed on both sides of the front surface of the color display body and exposing a designated color band to the front position, and arranged on both sides of one color band. Wherein the distance between the two masks is set to be inside the width of one color band of the color display.