JPH04365092A - Light emitting tube for image display - Google Patents

Abstract

PURPOSE:To improve the resolution of a large-screen display device by miniaturizing the shape of a light emitting tube for the cathode-ray tube image display provided in response to many picture elements decomposed with a large screen. CONSTITUTION:Three-primary color phosphors 5g, 5r, 5b are coated on the inner face of the image display surface 4 of a glass tube 2 vacuumed inside, an electron gun 6 emitting electron beams 14g, 14r, 14b to the phosphors 5g, 5r, 5b is arranged in the glass tube 2, liquid crystal shutters 7, 7, 7 are arranged respectively at positions individually corresponding to the three-color phosphors 5g, 5r, 5b on the outer face of the image display surface 4, three-primary color signals are inputted to the electron gun 6 in sequence in time division, the liquid crystal shutters 7, 7, 7 are opened or closed in sequence synchronously with the inputting of the three-primary color signals to select the phosphors to be seen, and color selection is made.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel arc tube for displaying images.

[0002] Specifically, a luminous tube for displaying an image is provided corresponding to each pixel constituting the screen of a giant screen display device, and in particular, a phosphor coated on the image display surface of a glass tube whose inside is evacuated is used. This relates to a cathode ray tube type video display light emitting tube that emits an electron beam using an electron gun to cause a phosphor to emit light.It can be made smaller and can be used to display a large screen using the video display light emitting tube. The present invention aims to provide a novel arc tube for displaying images that can improve the resolution of the device.

0003

[Prior Art] In recent years, screens with a side of several meters or tens of meters (hereinafter referred to as "giant screens") have become available.
A video device (hereinafter referred to as a "giant screen display device") that displays images on a large screen has appeared, and such a huge screen display device usually divides a huge screen into a large number of pixels and divides the huge screen into a large number of pixels for each pixel. A screen is constructed by installing a large number of light emitting tubes and arranging them vertically and horizontally.

[0004] There are various types of light-emitting materials used in such giant screens, such as cathode ray tube type light emitting tubes, discharge tubes, fluorescent tubes, and liquid crystal display panels equipped with backlights. As such, cathode ray tube type arc tubes have many advantages in terms of light output efficiency and light emission characteristics.

[0005] This type of arc tube has various limitations due to the use of a evacuated glass tube as the outer shell, as well as the ease of assembling the screen and the economic efficiency of manufacturing and maintaining the arc tube. For example, there is a configuration in which one glass tube is shared by eight arc tubes.

FIGS. 7 and 8 show an example of a conventional arc tube for color image display having such a configuration.

In the figure, a, a, . . . are arc tube blocks each having eight arc tubes b, b, .・・・
A large number of such arc tube blocks a, a, .

The arc tube block a is formed into a rectangular box shape with its front surface serving as an image display surface c.
The interior of the glass tube e is evacuated, and on the inner surface of the front wall f of the glass tube e are eight phosphor trios g, one set of three primary color phosphors, g, .

Further, in these phosphor trio g, phosphors g1, g2, and g3 of the three primary colors of green, red, and blue are arranged in the left-right direction.

Inside the glass tube e, a set of three phosphors, ie,
Three electron guns h1, h2, and h3 are provided, respectively corresponding to the three phosphors g1, g2, and g3.

These electron guns h1, h2, h3 have cathodes i, i, i arranged at a distance from each other in the left-right direction at the rear end inside the glass tube e, and cathodes i, i, i arranged in front of the cathodes i, i, i. It consists of a first grid j, j, j placed at a position corresponding to each of these, and a second grid k, k, k, etc. placed in front of the first grid j, j, j, and such One arc tube b is constituted by a set of three electron guns h1, h2, h3, the corresponding phosphor trio g, and a part of the glass tube e.

Further, these arc tubes b, b, . . . correspond to each picture element of each color, and are therefore provided in the same number as the predetermined number of picture elements for the screen d.

[0013] Therefore, a set of three electron guns h1, h2,
h3 is driven according to the color information of the pixel signal and becomes the cathode i.
, i, i, the electron beam is emitted from the first grid j, j, j and the second grid k, k,
The phosphor trio g collides with the predetermined phosphors g1, g2, and g3 of the phosphor trio g under control of acceleration, deflection, focusing, etc. by the phosphor k, etc., thereby causing the phosphor trio g to emit light in a desired color. A color image is displayed on the giant screen d by emitting light from each region of the image display surfaces c, c, .

[0014]

[Problems to be Solved by the Invention] However, with such a luminous tube b, it is difficult to achieve miniaturization;
There is a problem in that it is extremely difficult to increase the resolution of large screen display devices.

That is, since the first grids j, j, . It is very difficult to reduce the total width w in the arrangement direction of a set of three electron guns h1, h2, h3 because it is necessary to leave some space between them.

In addition, since the glass tubes e, e, . The arrangement pitch P of the arc tube blocks a, a, . . . is twice the thickness t of the glass tube e and the electron guns h1, h2,
The total width w of h3 plus a certain amount of space required for assembly is required, and therefore the picture elements of the giant screen display cannot be made smaller, and therefore the resolution cannot be increased. There was a problem.

[0017]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the video display luminous tube of the present invention has three primary color phosphors coated on the inner surface of the video display surface of the glass tube whose interior is evacuated. An electron gun that emits an electron beam to the phosphor is placed inside the glass tube, and a liquid crystal display is installed on the outside of the image display screen at a position corresponding to each of the three color phosphors. Shutters are arranged respectively, and the three primary color signals are time-divided and sequentially input to the electron gun, and the liquid crystal shutters are synchronized with the input of the three primary color signals and sequentially opened and closed to illuminate the three primary color phosphors. This allows selection and color sorting.

[0018]

[Function] Therefore, according to the arc tube for displaying images of the present invention, 1
One electron gun can make a set of three primary color phosphors shine in a desired color, and the width can be made considerably smaller than a conventional arc tube equipped with three electron guns. , it is possible to reduce the arrangement pitch of the arc tubes, thereby increasing the number of picture elements on a screen of limited size, and thus increasing the resolution of a giant screen display.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the video display luminous tube of the present invention will be explained below according to the embodiments shown in the accompanying drawings.

1, 1, . . . are arc tube blocks,
The arc tube block 1 includes a certain number of arc tubes 3, 3, .
... are assembled into a set.

The glass tube 2 is formed in the shape of a rectangular box that is elongated in the left and right direction, the inside thereof is evacuated, and at least the front wall 4 thereof is formed transparent.
The front wall 4 is a video display surface, that is, the arc tubes 3, 3, . . .
The image display surface has the same number of picture elements as the number of pixels that emit light.

The arc tube 3 has a phosphor trio 5 coated with three primary color phosphors on the inner surface of the front wall 4, and one electron phosphor trio 5 arranged inside the glass tube 2 corresponding to one phosphor trio 5. It consists of a gun 6 and three liquid crystal shutters 7, 7, 7, etc. arranged in front of the front wall 4 in correspondence with the three primary color phosphors.

The phosphor trio 5 consists of phosphors 5g, 5r, and 5b of three primary colors (green, red, and blue) arranged in the order of horizontal direction, and each of these phosphors 5g, 5r, and 5b is long in the vertical direction. It is applied in the form of strips.

[0024] Such a phosphor trio 5, 5,
... are arranged in one glass tube 2, for example, in two rows, four each in the left and right directions, and the pitch of the arrangement is constant in both the left and right directions and the up and down directions.

The electron gun 6 is disposed behind the phosphor trio 5 and on the rear side of the glass tube 2 so as to correspond to the phosphor trio 5. a cathode 9 supported on the front surface of the plate 8; one first grid 10 disposed in front of the cathode 9; and 5g of each color phosphor of the phosphor trio 5 in front of the first grid 10; It consists of second grids 11g, 11r, 11b, etc. arranged so as to correspond to grids 5r and 5b, respectively.

The first grid 10 is formed in a vertically elongated rectangular shape when viewed from the front at the front part of the first grid piece 12 which is formed in a U-shape when viewed from above so as to be open at the rear. The grid piece 12 is supported by the insulating plate 8 so as to cover the cathode 9.

The second grids 11g, 11r, 11b are thin and have a rear surface closed by an insulating plate 8 that supports eight cathodes 9, 9, . . . and eight first grid pieces 12, 12, . are formed at positions corresponding to the respective first grid pieces 12 of the second grid plate 13 formed in a box shape,
Among the second grids 11g, 11r, and 11b, the one in the middle is located on the line connecting the red phosphor 5r and the first grid 10.

[0028] Also, the second grids 11g, 11r, 11
b is formed in a vertically long rectangular shape when viewed from the front, and 11r corresponding to the red phosphor 5r is the other second grid 11
It is formed thinner than g and 11b. This is because the second grid 11r is closest to the first grid 10 and
This is based on the fact that among the primary color phosphors 5, the red phosphor 5r has the highest luminous efficiency.

Then, the cathode 9 and the first grid piece 12
are supported by one insulating plate 8 in two stages, four in the left and right direction, and this insulating plate 8 is attached so as to cover the rear opening of the second grid plate 13. Eight sets of electron guns 6, 6, . . . are configured.

Furthermore, the eight sets of electron guns 6, 6, .
1r, 11b, ... are each phosphors 5g, 5r, 5b
, 5g, 5r, 5b, . . .

[0031] When cathode electrons are emitted from the cathode 9, the cathode electrons are accelerated, focused, deflected, etc. by the first grid 10 and the second grids 11g, 11r, and 11b. Book electron beam 14g,
14r, 14b (see FIG. 4) and collide with each of the phosphors 5g, 5r, 5b formed on the inner surface of the front wall 4 of the glass tube 2, respectively, and as a result, the phosphors 5g, 5r, 5b simultaneously It emits light.

The liquid crystal shutter 7 has two transparent electrode plates 15a and 15b arranged with a narrow gap in the front and rear directions.
and the liquid crystal 16 etc. sealed between the electrode plates 15a and 15b, and as described above, they are arranged on the front surface of the front wall 4 of the glass tube 2 at positions corresponding to the phosphors 5g, 5r, and 5b, respectively. ing.

Therefore, the area corresponding to the phosphor trio 5 on the front surface of the front wall 4 of the glass tube 2 is covered with a liquid crystal shutter 7.
, 7,..., so 5g of phosphor
, 5r, 5b, the light emitted from the phosphors 5g, 5r
, 5b, and liquid crystal shutters 7, 7, located at positions corresponding to 5b.
7 is prevented from ejecting forward unless it is optically opened.

One arc tube 3 is constituted by one phosphor trio 5, one electron gun 6 corresponding to the phosphor trio 5, and liquid crystal shutters 7, 7, 7. 3, 3, . . . are assembled in a collective shape sharing one glass tube 2 to form an arc tube block 1, and a large number of such arc tube blocks 1, 1, . . . are arranged vertically and horizontally. to form one giant screen.

The operation of the arc tube 3 is controlled as follows (
(See Figure 5).

In the NTSC system, the field frequency of the video signal is 60 Hz, so the time during which one picture element signal is input to one picture element is 1/60 second.

Therefore, in the video display arc tube of the present invention, the pixel signals input to the electron gun 6 of each arc tube 3 are time-divided into three, and the first 1/3 (1/60 seconds x 1/3 = 1/180 seconds), as a signal to make 5g of green phosphor emit light,
Also, the middle 1/3 (1/60 seconds x 1/3 = 1/180
seconds), as a signal to make the red phosphor 5r emit light,
Furthermore, the next 1/3 (1/60 seconds x 1/3 = 1/180 seconds)
Then, it is input to the electron gun 6 as a signal for causing the blue phosphor 5b to emit light.

As a result, among the three time-divided pixel signals, in the previous 1/180 second, the electron beams 14g and 14r of the output that should strike the green phosphor 5g from the electron gun 6 are
, 14b are emitted, and the electron beams 14g, 14r,
Each of the phosphors 5g, 5r, and 5b emits light by the phosphor 14b.

During the next 1/180 seconds, the electron beam 14g is emitted from the electron gun 6 with an output that should hit the red phosphor 5r.
, 14r, 14b are output, and this electron beam 14g,
Each of the phosphors 5g, 5r, and 5b emits light by the phosphors 14r and 14b, respectively.

Furthermore, during the final 1/180 second, electron beams 14g, 14r, and 14b are emitted from the electron gun 6 with the power to strike the blue phosphor 5b, and this electron beam 1
4g, 14r, 14b each phosphor 5g, 5r, 5b
are emitted respectively.

[0041] Therefore, one arc tube emits 3 lights in 1/60 second
Light is emitted separately in two time-divided states, depending on the intensity of the electron beam at that time.

[0042] Furthermore, the liquid crystal shutters 7, 7, 7 include:
The gates are sequentially opened and closed by signals synchronized with the picture element signals.

That is, during the first 1/180 seconds when the pixel signal is time-divided into three, only the liquid crystal shutter 7g corresponding to the green phosphor 5g is opened, and as a result, the three light emitted as described above are opened. Of the three phosphors 5g, 5r, and 5b, only the light emitted from the green phosphor 5g is emitted to the front of the arc tube 3.

In the next 1/180 seconds, only the liquid crystal shutter 7r corresponding to the red phosphor 5r is opened, and as a result, among the three phosphors 5g, 5r, and 5b, the red phosphor 5
Only the light emitted by r is emitted to the front of the arc tube 3.

In the last 1/180 seconds, only the liquid crystal shutter 7b corresponding to the blue phosphor 5b is opened, and as a result, of the three phosphors 5g, 5r, and 5b, only the blue phosphor 5b emits light. It is emitted to the front of the tube 3.

[0046] Therefore, three phosphors 5 are produced in 1/60 seconds.
g, 5r, and 5b appear to shine in that order when viewed from the front by opening and closing the liquid crystal shutters 7g, 7r, and 7b, and since the brightness is caused by a predetermined output beam,
During 1/60 second, each of these different radiances appears to be colored, and therefore the arc tube 3 appears to be radiant in a color corresponding to the output of the three time-divided electron beams.

For example, in FIG. 5, at the 3/60th second, that is, the third 1/60th second, the output of the pixel signal is the same throughout the period, so the pixel signal shines almost white during this period. It becomes visible.

The light emitting tube for displaying images according to the present invention also has an electron gun 6.
A stereoscopic image can also be obtained by controlling the pixel signals to and the control signals to the liquid crystal shutters 7, 7, and 7 as follows (see FIG. 6).

That is, the time (1/60 second) for inputting one pixel signal to one pixel is time-divided into six times, and the previous one
/2 (1/60 seconds x 1/2 = 1/120 seconds) and the later 1/2
2 (1/120 seconds) into a right-eye pixel signal and a left-eye pixel signal, and further time-divide each left-eye pixel signal into three, and as described above, electronic Controls the output of the electron beam of the gun 6.

In addition, the liquid crystal shutters 7, 7, 7 are synchronized with the picture element signal, and the previous 1/2 (1/120 second)
Then, apply a predetermined voltage and control the deflection angle for the right eye, and then apply another predetermined voltage and control the deflection angle for the left eye at 1/2 (1/120 seconds). shall be.

[0051] The viewer then looks at the arc tube 3 into which the pixel signals are inputted as described above through polarized glasses, thereby realizing the previous 1/1/2
2 (1/120 seconds) is the right eye and the predetermined color added at that time, and the next 1/2 (1/120 seconds) is the left eye and the predetermined color added at that time. It can be viewed separately, which allows a stereoscopic image to be viewed.

[0052]

[Effects of the Invention] As is clear from the above description, the video display luminous tube of the present invention is a video display luminous tube provided corresponding to each pixel constituting the screen of a giant screen display device. a glass tube whose interior is evacuated, and three primary color phosphors coated on the inner surface of the image display surface of the glass tube;
One electron gun is arranged inside the glass tube at a position corresponding to the image display surface and emits an electron beam to the three primary color phosphors; It is equipped with three liquid crystal shutters arranged in corresponding positions, and the three primary color signals are time-divided and sequentially input to the electron gun, and the liquid crystal shutters are synchronized with the input of the three primary color signals. The phosphors are sequentially opened and closed to selectively color-sort the phosphors that emit light from the entire surface.

Therefore, according to the arc tube for displaying images of the present invention, one set of three primary color phosphors can be made to shine in a desired color with one electron gun, and the conventional arc tube equipped with three electron guns can be made to shine in a desired color. Since the width dimension can be made considerably smaller than that of the previous model, the arrangement pitch of the arc tubes can be reduced accordingly, which makes it possible to increase the number of picture elements on a screen of limited size. This allows you to increase the resolution of giant screen displays.

It should be noted that the structure of the electron gun, the shape of the phosphor, the number of arc tubes that share one glass tube and their arrangement, etc., shown in the above embodiments may vary in carrying out the present invention. These are merely examples of specific embodiments, and the technical scope of the present invention should not be construed as being limited by them.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing an arc tube block in which a large number of arc tubes are arranged to share a single glass tube.

FIG. 2 is a horizontal sectional view showing the main parts of the arc tube block.

FIG. 3 is a partially cutaway front view.

FIG. 4 is an enlarged horizontal cross-sectional view of one arc tube.

FIG. 5 is a time chart diagram for explaining control operations.

FIG. 6 is a time chart diagram illustrating a control operation for viewing a stereoscopic image.

FIG. 7 is a front view showing a conventional video display light emitting tube, with a portion cut away to show the main part of the screen.

8 is an enlarged cross-sectional view taken along line VIII-VIII in FIG. 7. FIG.

[Explanation of symbols]

2 Glass tube 3. Luminous tube for video display 4 Video display screen 5g phosphor 5r phosphor 5b Phosphor 6 Electron gun 7. Liquid crystal shutter 14g electron beam 14r　Electron beam 14b Electron beam

Claims (1)

[Claims] 1. An image display luminous tube provided corresponding to each picture element constituting the screen of a giant screen display device, comprising:
A glass tube whose interior is evacuated, three primary color phosphors coated on the inner surface of the image display surface of the glass tube, and three primary color phosphors placed inside the glass tube at a position corresponding to the image display surface. It is equipped with one electron gun that emits an electron beam to the body, and three liquid crystal shutters arranged on the outer surface of the image display surface at positions corresponding to the three primary color phosphors, respectively, and three primary color signals. are sequentially input to the electron gun in a time-divided manner, and the liquid crystal shutter is synchronized with the input of the three primary color signals to sequentially open and close to selectively color-sort the phosphors emitted from the entire surface. A light emitting tube for displaying images.