JPH0278141A - Image displaying device - Google Patents

Abstract

PURPOSE:To lower dispersion of luminuce in vertical direction of an image displaying plane by bridging a pair of linear cathode as electron beam source for one section in parallel each other while keeping a distance about the radius of the linear cathode between them. CONSTITUTION:Linear cathode 2 and 2' are bridged in parallel while keeping a distance about the radius of the linear cathode between them. First, they are bridged by a fixing seat 31 and a spring 33, supported by V-shaped grooves 34 to prevent them from out of position, and then electron beams distributed horizontally in strip-like shapes are generated from linear cathodes 2, 2' as beam sources in parallel each other. When passing a raw of through holes 10 of a perpendicularly focusing electrode 3, the stripe-like electron beams are devided in horizontal direction. When the linear cathode 2 or 2' starts vibrating, the other linear cathode 2' or 2 absorb the vibration and thus the vibration is lowered and as a result fluctuation of intensity of electron beam passing the raw of through holes 10 of the perpendicularly focusing electrode 3 can be decreased. After that, the electron beam is diffused while deflected perpendicularly when passing a perpendicularly deflecting electrode 4.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention generates an electron beam for each division when a screen on a screen is vertically divided into a plurality of divisions, and generates an electron beam for each division. The present invention relates to an apparatus for displaying a plurality of lines by vertically deflecting a beam to display a television image as a whole.

2. Description of the Related Art First, a basic configuration example of an image display element used here will be explained with reference to FIG.

This display element includes, in order from the back to the front, a back electrode 1, a line cathode 2 as a beam source, and a vertical focusing electrode 3.3'.
, a vertical deflection electrode 4, a beam flow control electrode 5, a horizontal focusing bridge 6, a horizontal deflection electrode 7, a beam acceleration electrode 8, and a screen plate 9. ) is housed inside a vacuum chamber. A line cathode 2 serving as a beam source is stretched horizontally so as to generate an electron beam distributed linearly in the horizontal direction, and a plurality of line cathodes 2 (here, (Only 2-2-2-4 trees are shown). In this embodiment, it is assumed that 15 pieces are provided. Let's call them 2i~2yo. These wire cathodes 2 are constructed by coating the surface of a tungsten wire with a diameter of 10 to 20 μΦ with an oxide cathode material for thermionic emission. These line cathodes 2A to 2Y are heated so as to generate a thermionic electron beam by passing an electric current through them, and as will be described later, the electron beams are generated sequentially for a certain period of time starting from the line cathode 2I. controlled to emit. The back electrode l suppresses generation of electron beams from other line cathodes 2 other than the line cathode 2 controlled to emit electron beams for a fixed period of time, and directs the generated electron beams only in the forward direction. It has the effect of pushing out toward the target. Any back electrode 1 may be formed by a coating of conductive material applied to the inner surface of the rear wall of the glass bulb. Further, instead of the back electrode 1 and the linear cathode 2, a planar electron beam emitting cathode may be used. - The vertical focusing electrode 3 is a conductive plate 11 having 100 rows of through holes arranged at small intervals in the horizontal direction facing each of the line cathodes 2a to 2yo, and the electrons emitted from the line cathodes 2 The beam is extracted through the row of through holes IO and vertically focused. The interval between the through holes 10 is the same as the slit interval of the control electrode 5, which will be described later. As a result, electron beams for one horizontal line (360 pixels) are simultaneously extracted. In the figure, only one section in the horizontal direction is shown.

A plurality of vertical deflection electrodes 4 are arranged horizontally at intermediate positions between the rows of through holes 10, and conductors 13.13° are provided on the upper and lower surfaces of the insulating substrate 12, respectively.
It consists of a set of

Then, a vertical deflection voltage is applied between the opposing conductors 13.13 degrees, thereby deflecting the electron beam in the vertical direction.

In this example, a pair of conductors 13.13"
The electron beam from the book line cathode 2 is vertically deflected to a position corresponding to 16 lines. And 16 vertical deflection electrodes 4
Thus, 15 conductor pairs corresponding to each of the 15 wire cathodes 2 are constructed, and in the end, 240 conductor pairs are formed on the screen 9.
The electron beam is deflected to draw a horizontal line on the book.

Next, the control electrodes 5 are composed of conductive plates 15 each having a vertically long slit 14, and a plurality of control electrodes 15 are arranged in parallel in the horizontal direction at predetermined intervals. In this embodiment, 180 conductive plates 15a to 15n for control electrodes are provided (only nine are shown in the figure). The control electrode 5 allows the electron beam divided by the through hole 10 of the vertical focusing electrode 3 to pass through each slit 14, and controls the amount of the electron beam passing through in accordance with a video signal for displaying each picture element. Therefore, the conductive plate 15a for the control electrode 5
- If 180 pieces of 15n are installed, 36 per horizontal 1547 minutes
0 pixels can be displayed. In addition, in order to display images in color, each picture element is displayed using phosphors of three colors, R, G, and H, and each control electrode 5 has two picture elements of R, G, and H.
, B are sequentially applied.

In addition, 180 sets of video signals for one line (2 pixels per set) are simultaneously applied to each of the 180 conductive plates 15a to 15n for the control electrode 5, and the video for one line is displayed at one time. Ru.

The horizontal focusing electrode 6 is composed of a conductive plate 17 having a plurality of vertically long slits 16 (180 slits) facing the control electrode 5's slit 14. Each electron beam is focused horizontally into a narrow electron beam.

The horizontal deflection electrodes 7 include a plurality of conductive plates 18.1 arranged vertically on both sides of the slit 16.
8°, each electrode 18, 18'
A six-step horizontal deflection voltage is applied to horizontally deflect the electron beam for each pixel, and the two sets of R, G, and B phosphors are sequentially irradiated on the screen 9 to emit light. Let them do it. In this embodiment, the deflection range is two picture elements wide for each electron beam.

The acceleration electrode 8 is composed of a plurality of conductive plates 19 provided horizontally at the same position as the vertical deflection electrode 4.
The electron beam is accelerated to collide with the screen 9 with sufficient energy.

The screen 9 is constructed by coating the back surface of a glass plate 21 with a phosphor 20 that emits light when irradiated with an electron beam, and a metallic layer (not shown) is added thereto.

The phosphors 20 are provided with two pairs of phosphors of three colors R, G, and B for each slit 14 of the control electrode 5, that is, for each horizontally divided electron beam. It is applied in vertical stripes.

In FIG. 1, the broken lines drawn on the screen 9 indicate divisions in the vertical direction that are displayed corresponding to each of the plurality of line cathodes 2, and the two-dot chain lines correspond to each of the plurality of control electrodes 5. Indicates the horizontal division displayed. As shown in an enlarged view in FIG. 4, one section partitioned by these two contains R, G, and B phosphors 20 for two picture elements in the horizontal direction.
It has a width of 16 lines in the vertical direction.

The size of one section is, for example, 1-1 mm in the horizontal direction and 10 mm in the vertical direction.

Note that in FIG. 3, the length in the horizontal direction is drawn much larger than the length in the vertical direction for clarity.

Further, in this embodiment, only one pair of R, G, and B phosphors 20 for two picture elements are provided for one control electrode 5, that is, for one electron beam, but of course, one picture element Alternatively, three or more picture elements may be provided, and in that case, the control electrode 5 has R, G, and B for one picture element or three or more picture elements.
The video signals are sequentially separated and horizontally deflected in synchronization with them.

Problems to be Solved by the Invention However, in the above configuration, the line cathode as an electron beam source has a structure in which it easily vibrates, making the amount of electron beam passing through the through hole of the vertical focusing electrode unstable. As a result, there is a problem in that brightness unevenness appears in the vertical direction on the screen.

In view of the above problems, the present invention stabilizes the amount of electron beam passing through the through hole of the vertical focusing electrode by making the line cathode as an electron beam source have a structure that does not easily vibrate. The present invention aims to provide an image display device that can reduce unevenness.

Means for Solving the Problems To achieve this object, the image display device of the present invention includes:
A section of wire cathode serving as an electron beam source is stretched parallel to Miki at intervals approximately equal to the length of the radius of the wire cathode.

Effect With this configuration, if one wire cathode starts to vibrate,
The vibrations are transmitted to the other wire cathode, but due to the frictional force acting between the wire cathodes, the vibrations tend to converge.

Conversely, even when the other wire cathode begins to vibrate, the vibration tends to converge due to the frictional force acting between the one wire cathode and the wire cathode. When both the - line cathode and the other line cathode vibrate, they also tend to converge. As a result, the amount of electron beam passing through the through hole of the vertical focusing electrode 3 can be stabilized, so that an image display device with less vertical brightness unevenness on the screen can be obtained.

Embodiment Hereinafter, an image display device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of an image display device in an embodiment of the present invention.

In Figure 1, 1 is a back electrode, 2 and 2' are line cathodes,
3 is a vertical focusing electrode, 4 is a vertical deflection electrode, 5 is a beam flow control electrode, 6 is a horizontal focusing electrode, 7 is a horizontal focusing electrode, 8 is a beam acceleration bridge, and 9 is a screen plate. Line cathode 2, 2
The other parts are the same as in FIG. 3.

FIG. 2 shows one section of a line cathode of an image display device in an embodiment of the present invention.

In Figure 2, 2 and 2° are line cathodes as mentioned above,
The wire cathodes 2 are stretched parallel to each other with an interval approximately equal to the length of the radius of the wire cathode 2. 31 is a fixed seat for maintaining one end of the wire cathodes 2, 2°, 32 is a frame, 33 is a spring for stretching and supporting the wire cathodes 2, 2°, and 34 is a position shift of the wire cathodes 2.2". This is a V-groove to prevent this.

The operation of the image display device configured as described above will be described below.

First, two line cathodes 2A and 2°A, which are parallel to each other and are stretched by fixed seats 31 and springs 33 and supported by grooves 34 so as not to be misaligned, are moved in the J horizontal direction. Generates a band-shaped electron beam. Next, by passing through the row of through holes 10 of the vertical focusing electrode 3, the band-shaped electron beam is divided in the horizontal direction. Here, line cathode 2
．． 2° begins to vibrate, the line cathode 2 or 2 absorbs the vibration, reducing the vibration. As a result, the amount of electron beam passing through the row of through holes 10 of the vertical focusing electrode 3 fluctuates. becomes smaller. Thereafter, the electron beam is diffused while being vertically deflected while passing through the vertical deflection electrode 4. The control electrode 5 controls the amount of electron beam passing through in accordance with a video signal for displaying each picture element. Further, the electron beam focused in the horizontal direction by the horizontal focusing electrode 6 is deflected in the horizontal direction by the horizontal deflection electrode 7, and sequentially irradiates two sets of R, G, and B phosphors 20 on the screen 9. Emits light.

As described above, according to this embodiment, the two linear cathodes 2 and 2' are stretched in parallel with an interval approximately equal to the length of the radius of the linear cathode, so that the line cathodes 2 and 2' pass through the through hole of the vertical focusing electrode 3. As a result, an image display device can be obtained that can stabilize the amount of electron beams and reduce uneven brightness in the vertical direction on the screen.

Effects of the Invention As described above, according to the present invention, the electron beam passing through the through hole of the vertical focusing electrode is As a result, it is possible to obtain an image display device that can stabilize the amount of brightness and reduce vertical brightness unevenness on the screen.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of an image display device according to an embodiment of the present invention, FIG. 2 is a perspective view of only the line cathode portion of the image display device according to an embodiment of the present invention, and FIG. 3 is a conventional image display. FIG. 4 is an exploded perspective view of the device and an enlarged view showing the structure of the screen of the device. 2.2″... Line cathode, 3... Vertical focusing electrode, 4... Vertical deflection electrode, 5... Beam flow control electrode, 6... ...Horizontal focusing electrode, 7...
...Horizontal deflection electrode, 9...Screen. Name of agent: Patent attorney Shigetaka Awano 1 person? , Do'-
--Tree (Kto1's (3/--IchigochiKou 34----V skin Fig. 2 Fig. 4 n

Claims (1)

[Claims] The screen on the screen is vertically divided into a plurality of sections, and each vertical section has a line cathode stretched in the horizontal direction, and a plate-shaped plate having a row of through holes in the horizontal direction facing each of the line cathodes. a vertical focusing electrode, a beam separation electrode for horizontally dividing the incident electron beam into multiple electron beams, and a vertical and horizontal deflection for vertically and horizontally deflecting each of the divided electron beams. What is claimed is: 1. An image display device comprising: an electrode, wherein two line cathodes of one section serving as electron beam sources are stretched in parallel with an interval approximately equal to the length of the radius of the line cathodes.