JPH02284338A - Flat display - Google Patents

Abstract

PURPOSE:To prevent implosion and restrain luminous unevenness by wholly providing plural apertures, in which a cross section shape is contracting from an address electrode substrate side toward a front panel side, on a spacer panel. CONSTITUTION:One or more apertures 51 are provided on individual regions where both address electrodes 4 and 6 of an address electrode substrate 12 are crossed. For instance, when plural apertures 51 are provided on a cross region of both the electrodes, a transit region of an electron is ensured even if drift occurs in that position. Since an address electrode substrate 12 side is sufficiently widely opened in an aperture 31 of a spacer panel 3, an electron beam is unhindered with the spacer panel 3. Moreover, since the aperture 31 is contracted in a front panel 1 side, sufficient strength is maintained and atmospheric pressure acting the front panel 1 is supported with sufficient bearing force even an opening in the address electrode substrate 12 side is enlarged. This prevents implosion, and concurrently restrains luminous unevenness.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a device that displays an image by exciting phosphors in a display panel with an electron beam, and particularly to a flat display suitable for large-screen TVs. .

(Prior Art) Various types of flat displays are being researched with the aim of creating high-definition large-screen wall-mounted TVs. By the way, C
RT is the most superior method in terms of image quality because a high-speed electron beam irradiates and excites the phosphor. but,
CRTs for high-definition TVs of 40 inches or more have a weight of 170 kg and a depth of over 850 mm, making them unacceptable for general home use.

Therefore, an electron beam type flat display has been proposed in which a high-speed electron beam is emitted from a cathode and is controlled by an XY matrix electrode to strike a predetermined address on a phosphor screen (U.S. Pat. No. 4,719,388 and Japanese Patent Laid-Open No. (Sho 6l-242489).

FIG. 7 shows the configuration of a flat display according to the above-mentioned US patent. This is a flat space formed by a front panel (10) with a fluorescent screen on the inside and a back panel (70) with a back electrode (72) on the inside, and a linear filament cathode (80) and an address electrode substrate. (
12) and a filament cathode (80
) and the address electrode substrate (12), a grid-shaped accelerating electrode (9) is arranged in parallel thereto.

The address electrode substrate (12) has first address electrodes (4
Apertures (53) are provided at the points where the electrodes 0) and the second address electrodes (60) intersect, respectively. In the device, two selected address electrodes (40) (6G)
When a positive voltage is simultaneously applied to the electrodes, an electron beam is extracted from the aperture (53) located at the intersection of these electrodes, and irradiates the fluorescent screen of the front panel (10) to which a high voltage is applied, causing it to emit light. be.

This method is basically the same principle as CRT, so it can be used with other flat display methods, such as plasma display panel (POP) method and liquid crystal display (LCD).
) method, fluorescent display tube (VFD) method, etc., higher image quality can be obtained.

(Problem to be solved) In the case of high-speed electron beam method, the inside of the display is 10-
”While maintained in a vacuum of Torr, the front and back panels are subjected to large compressive forces due to atmospheric pressure. If the display is small, the necessary pressure resistance can be achieved by increasing the glass thickness of the panel. However, in a large high-definition display having the structure shown in FIG. 7, there is a problem in that increasing the thickness of the glass plate increases the weight significantly.

Further, in the address electrode substrate (12) of FIG. 7, as shown in FIG. 8A, the first address electrode (40) and the second address electrode (60) sandwich the base (50). Since one aperture (53) is opened in the center of the intersecting region, due to the accumulation of errors during manufacturing of the aperture and each electrode, the aperture (53) is connected to both electrodes (40) as shown in FIG. 8B. (60) may deviate from the intersection area.

Therefore, if the positional deviation is extreme, the aperture (53) will completely deviate from the intersection area of the electrodes (40) and (60) as shown in Figure 8C, resulting in pixels that do not emit light at all, resulting in a decrease in image quality. Invite.

On the other hand, as shown in FIG.
A spacer panel (3) having a large number of apertures (32) is arranged in the space between the front panel (1) and the front panel (1), thereby devising a flat display with increased pressure resistance.

However, in the flat display shown in Fig. 5, it is necessary to precisely match the aperture (32) of the spacer panel (3) and the aperture (52) of the address electrode substrate (12), and there is a need to accurately match the aperture (52) of the address electrode substrate (12). occurs,
There was a problem in that the area through which electrons passed became narrower, causing uneven light emission on the screen. FIG. 6 shows the worst case of this problem, in which the overlapping area of both apertures, indicated by hatching in the figure, ie, the region through which electrons pass straight through becomes extremely small.

An object of the present invention is to provide a flat display that can prevent implosion and suppress uneven light emission.

(Means for Solving the Problems) In the flat display according to the present invention, in the flat space between the front panel (1) and the back panel (7),
Filament cathode (8) and address electrode substrate (1
2) is placed.

One or more apertures (51) are provided in the address electrode substrate (12) in each area where both the address electrodes (4) and (6) intersect with the base body (5) in between.

Further, a spacer panel (3) is arranged between the address electrode substrate (12) and the front panel (1). A plurality of apertures (31) whose cross-sectional shape decreases from the address electrode substrate (12) side to the front panel (1) side are opened on the entire surface of the spacer panel (3).

(Function) Although the filament cathode (8) always emits electrons, the address electrode (4) of the address electrode substrate (12)
When an address signal voltage is applied to (6), an electron beam is attracted from the filament cathode (8) closest to the address position, and the electron beam is directed to the address electrode substrate (
The phosphor (2) at the corresponding position on the front panel (1) is irradiated through the aperture (51) at the address position of 12) and the aperture (31) of the spacer panel (3).

(Effects of the Invention) In the flat display according to the present invention, one or more apertures (51) are provided in each area where both address electrodes (4) and (6) of the address electrode substrate (12) intersect. Therefore, for example, when providing a plurality of apertures (51) in the intersection region of both electrodes, even if the positions of the apertures (51) are shifted, one or more apertures (51) will always open in the intersection region. Therefore, a region through which electrons can pass is secured.

In addition, since the aperture (31) of the spacer panel (3) has a sufficiently wide opening on the address electrode substrate (12) side, the electron beam passing through the address electrode substrate (12) is blocked by the spacer panel (3). Never.

However, the aperture (31) of the spacer panel (3) is
Since it is reduced to the front panel (1) side, even if the opening on the address electrode substrate (12) side is enlarged, sufficient strength can be maintained and the atmospheric pressure acting on the front panel (1) can be withstood with sufficient strength. support.

Therefore, according to the flat display of the present invention, implosion is prevented and uneven light emission is suppressed at the same time.

Embodiments The drawings and the following description depict one embodiment of the invention, and should not be interpreted as limiting the scope of the claims.

As shown in FIGS. 1 and 2, a flat display is constructed by stacking a front panel (1), a spacer panel (3), an address electrode substrate (12), and a back panel (7). The periphery of the front panel (1) is integrated with the inner surface of the front panel (1) to form a flat sealed space.

Front panel (1) has a horizontal length of 880 mm and a vertical length of 497 m.
m.

It is a large panel with a thickness of 3 to 4 mm, and as is well known, phosphors (2) of the three primary colors of red, blue, and green are formed on the inner surface at a predetermined pixel pitch.

The back panel (7) is formed of a glass plate of 3 to 4 mm, and spacer strips (71) with a height of about 0.3 mm are protruded at a constant pitch on the inner surface. The spacer shape (30)
The width is gradually narrowed on the address electrode substrate (12) side, and both side surfaces of the spacer strip are symmetrically inclined with respect to the plate surface of the rear panel (7).

On the inside of the back panel (7), line-shaped filament cathodes (14) are stretched under tension in each space between spacer strips (71). The cathode is a tungsten wire with a diameter of 30 to 50 μm coated with an electron emitter material such as barium oxide.

- Cover the inner surface of the back panel (7) and the entire length side surface of the spacer strip (71) with a metal film to form a back electrode (72).

As is well known, the filament cathode (8) emits free electrons by applying an alternating current of 100 KHz with an amplitude of ±2 cm with the center voltage being 0 volts.

On the other hand, the back electrode (72) is maintained at zero volts DC or a slightly higher potential to facilitate the emission of electrons from the circumferential surface of the cathode.

The address electrode substrate (12) has a first address electrode (4) facing one side of the XY matrix formed on one surface of a plate-like substrate (5) made of glass or ceramic and having a thickness of 1 mm. 5) is provided with a second address electrode (6) extending orthogonally to the address electrode.
) to form.

A large number of apertures (51) are provided on the entire surface of the address electrode substrate <12>re. These apertures (
51) are arranged at a fine pitch so that at least one electrode is included in the intersection area of both electrodes (4) and (6).

In the embodiment of FIG. 1, twelve apertures (51) are provided.

As shown in Fig. 3, the diameter of the aperture (51) is Da, the shortest distance between adjacent apertures is Ia, and the second address electrode (
6) width is Wxg, and the gap width between electrodes (6) (6) is I.
xg, the pitch of the second address electrode (6) is Pxg, the width of the first address electrode (4) is wyg, the electrode (4) (
4) If the gap width between them is IYg and the pitch of the first address electrode (4) is pyg, then Wxg= kX (D a+ I a) I xg= L
X (D a+ I a)P xg= (k+ l)
X (Da+I a)Wyg=mX (Da+I
a) I yg= nX (D a+, I a) P yg=
(m+ n) X (D a+ I a) However, kS
Each radical method is determined so that l, m, and n are integers.

Note that FIG. 3 shows the case where k=3, l=1, m=4, and n=1.

In this embodiment, the aperture (51) has a circular cross-sectional shape, but it goes without saying that it may have a polygonal shape.

As shown in FIGS. 1 and 2, the address electrode substrate (12) is
Spacer strips (
71), and is bonded if necessary to prevent bending vibration.

The spacer panel (3) has a large number of apertures (31) formed in the glass plate at the pixel pitch of the phosphor (2) of the front panel (1), and each aperture (31) is connected to the address electrode substrate (12). It has a tapered cross section that decreases in diameter from the side toward the front panel (1) side. Aperture (3
The openings on the address electrode substrate (12) side of 1) are formed as large as possible so as not to overlap with each other, and in this example,
It has a sufficiently wider opening area than the aperture (51) of the address electrode substrate (12).

On the other hand, the opening area of the aperture (31) on the front panel (1) side is determined by the phosphor (2) provided on the inner surface of the front panel (1).
is defined according to the size of one pixel.

Therefore, even if a positional shift occurs between the aperture (31) of the spacer panel (3) and the aperture (51) of the address electrode substrate (12), a sufficient electron passage area is ensured. For example, as shown in Figure 4, both apertures (51) (
Even in the worst case where the positional deviation of 31) is at its maximum, the straight electron passage area shown by hatching in the figure is larger than in the case of FIG. 6.

In the above flat display, when an address signal voltage is applied to the address electrodes (4) and (6) of the address electrode substrate (12), electrons are attracted from the filament cathode (8) closest to the address position, and the electrons are teeth,
As shown by the chain line in Fig. 2, first the address electrode substrate (12
) is divided into a plurality of apertures (51) at the address positions of To efficiently irradiate the body (2).

Therefore, the uneven light emission that was a problem in the flat display of FIG. 5 does not occur, and a clear image can be obtained.

Furthermore, since the back panel (7) is reinforced by the plurality of spacer strips (71) and the address electrode substrate (12) and the front panel (1) are directly supported by the spacer panel (3), the glass Sufficiently high pressure resistance can be obtained without increasing the thickness.

The drawings and the description of the above embodiments are for illustrating the present invention, and do not limit the invention described in the claims.
Nor should it be construed as limiting the scope.

Further, the configuration of each part of the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made within the technical scope of the claims.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing the main parts of a flat display according to the present invention, FIG. 2 is a vertical cross-sectional view, FIG. 3 is a plan view showing the arrangement of apertures on the address electrode substrate, and FIG. 4 is an address FIG. 5 is a partially cutaway perspective view of a flat display previously devised by the applicant, and FIG. 6 is a fourth diagram of the flat display. A corresponding plan view, FIG. 7 is a partially cutaway exploded perspective view of a conventional flat display, and FIG. 8A and BSC are diagrams explaining the positional relationship between the first and second address electrodes and apertures in the flat display. . (1)...Front panel (31)...Aperture (51)...Aperture (7)...Back panel (3)...Spacer panel (12)...Address electrode substrate (4) (6) Address electrode (71) Spacer strip

Claims (1)

[Claims] 1 In the flat space between the front panel (10) and the back panel (7), which have a phosphor (2) on the inner surface, the back panel (
An address electrode substrate (12) having a linear filament cathode (8) on the side 7) and a plurality of apertures (51) on the front panel (10) side is arranged, and the address electrode substrate (12) is a flat plate. a shaped substrate (5);
A plurality of first address electrodes (
4), and a plurality of second address electrodes (6) formed on the other surface of the base (5) in a direction crossing the first address electrodes (4). , the address electrode substrate (12) has a base (5)
One or more apertures (51) are provided in each region where both address electrodes (4) and (6) intersect, and a spacer panel (3) is provided between the address electrode substrate (12) and the front panel (1). It is noted that the spacer panel (3) is provided with a large number of apertures (31) whose opening cross section decreases from the address electrode substrate (12) side to the front panel (1) side. Features a flat display.