JPS60198044A - Image displayer - Google Patents

Abstract

PURPOSE:To improve the absorption of a getter even when only a small surface area of the getter can be flashed by vapordepositing a getter film on the back surface of a back electrode near the hot cathode. CONSTITUTION:A plate image displayer is assembled by installing an electrode structure consisting of an electron source, an electrode group for accelerating, focusing, deflecting and modulating electrons and a luminous phosphor in a flat glass case 6. A Ba alloy getter 8 installed in a case 9 is placed at a proper position in the case 6 so that when the getter 8 is flashed a getter film 10 is formed through vapordeposition on the back surface of a back electrode 7a near a linear hot cathode 7b. Therefore, it is possible to accelerate the diffusion of Ba by heating the Ba getter film 10 by heat radiated from a cathode 7b, thereby constantly supplying fresh Ba to the surface of the displayer. Accordingly it is possible to maintain the internal space of the case 6 at a hard vacuum.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a tube-type image display device in which the inside of the getter is kept at a high vacuum.

(Conventional structure and its problems) - In Au electron tubes, the degree of vacuum inside the tube decreases due to gas remaining in the tube during sealing and gas released from various constituent materials in the tube after sealing, so getter is used to adsorb these gases and maintain a high vacuum inside the tube. There are two types of ivy: evaporative ivy, which has a getter effect in both vapor and vapor-deposited form by flashing kernels on the inner wall of the tube in a vacuum, and evaporative ivy, which has a getter effect in both vapor and vapor-deposited film states, and evaporative ivy, which is applied to metal materials and fired in a vacuum. There are known non-evaporable ivy materials that later produce ivy effects; Ba, Mg, AA, etc. are known as materials for the former, and Zr, Ti, Th, etc. are known as materials for the latter. Here, as an example, the CRT shown in FIG. 1 will be described. Usually, a CRT uses a Ba getter, and Bal is heated to 900 DEG C. by high frequency and flashed onto the inner wall of the glass container 2. This C
In the case of R'[', the inner wall of the glass container 2, the electron gun 3, the conductive film 4, and the shadow mask 5 are the main gas emission sources, and a large amount of gas is emitted compared to other electron tubes. Since the inner wall of the evaporator is wide and a sufficient amount of getter can be flooded over a wide area with respect to the released gas trap, the evaporated Bal and resin (not shown) can quickly adsorb a large amount of released gas. The adsorption rate is high enough to make the inside of the glass container 2 a high vacuum for a long time, and the saturated adsorption amount is high enough to maintain the high vacuum for a long time.

Next, a conventional example of a flat panel image display device to which the present invention is applied will be described. As shown in FIG. 2, the flat panel image display device U1 includes an electron emission source in a flat glass container 6.
An electric contact structure 7 is provided, which is composed of an electrode group that accelerates, focuses, deflects, and modulates electrons from an electron emission source, and a phosphor that emits light when the electrons controlled by the electrode group collide. The inside of the glass container 6 is in vacuum. In the case of such a flat panel image display device, it is difficult to use high-frequency heating like the CRT shown in Fig. 1 when flashing the getter due to space problems, so it is necessary to flash the getter using resistance heating. There is. In this example, Ba alloy case 9 is used, and Ba-AA alloy 8 added with Ni powder is used in case 9.
By heating the Ba-k1 alloy 8 by passing current through the case 9, the Ba-k1 alloy 8 is heated.
A Ba getter film 10 is deposited on the inner wall of the glass container 6 by flooding.

However, in the conventional flat-panel image display device as described above, compared to a CRT of the same size, the number of parts that make up the electrode structure 7 is large, so there are many components such as metal, glass, and ceramic that are gas generating sources. The profit is several times higher,
On the other hand, since the area of the inner wall of the glass container 6 is narrow and the area where getter can be flushed is less than half, it is difficult to flush a sufficient amount of getter for the amount of released gas. For example, 10 inches (25,4
CwL) CRT's 8 ivy falcons are several 10'Om long on the panel.
9, whereas that of a flat panel image display device was about 40 m9.

For this reason, the inside of the glass container 6 could not be kept in a high vacuum for a long time, shortening the life of the flat panel image display device. Furthermore, even if the amount of getter is increased to the same level as that of a CRT, the area that can be flooded is small as described above, so the thickness of the Ba getter film 10 will only increase, and the amount of gas emitted will actually increase. It is Ba 0 ivy film 10 that adsorbs
The area from the surface to about 10X, the rest is diffusion
Since new Ba is deposited on the surface of the Ba getter film 10 to adsorb the released gas, the adsorption rate of the Ba getter film 1o is hardly improved and the characteristics as an image display device are not improved much.

(Object of the invention) The present invention has been made in view of the drawbacks of the above-mentioned conventional examples, and
By improving the suction ability of the ivy, the getter's flutter and shield are improved.
An object of the present invention is to provide an image display device that can maintain a high vacuum inside for a long time even when the available area is small.

(Structure of the Invention) In order to achieve the above object, the present invention provides an electron tube type image display device in which diffusion of a grease film is promoted near a hot cathode by radiant heat from the hot cathode. The getter film is vapor-deposited by flashing the getter in such a place.With this configuration, even if the place where the getter is flashed is small, such as in a flat panel image display device, a large amount of getter can be deposited. If the cutter film is made thicker, the getter film will diffuse more vigorously, exhibiting sufficient adsorption capacity for the amount of released gas, and making it possible to maintain a high vacuum inside the device for a long period of time.

(Hepatic portal of example) Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 3 is a diagram showing the configuration of an embodiment of the present invention, and the same reference numerals as in FIG. 2 indicate the same components. In FIG. 3, 7a and 7b are a back electrode and a plurality of linear hot cathodes as electron emission sources, respectively, which constitute a part of the electrode assembly 7, and are located close to each other. Furthermore, in this embodiment, a Ba getter film 1o is deposited on the back surface of the back electrode 7a.

In the above configuration, when the present embodiment is driven, each linear hot cathode 7b is heated to 600 to 700'C, and the back electrode 7b is heated to 600 to 700'C.
Due to the radiant heat, the temperature of the Ba ivy film 10 that has been deposited on the back surface of the back electrode 7a is about the same temperature. Here, B measured by Bloomer
ak room temperature, 40°C.

Figure 4 shows changes in the adsorption rate of o2 at various temperatures of 70°C. As is clear from this figure, the higher the temperature of the film, the higher the adsorption rate and the saturated adsorption amount of Ba14, and the higher the adsorption ability as a getter. Therefore, in this embodiment, as described above, the Ba getter film 1o is deposited on the back surface of the back electrode 7a adjacent to the linear hot cathode 7b, and the radiant heat from the linear hot cathode 7b is applied to the back surface 'l:I,4''n. Ba via 7a
By heating the ivy film lO, Ba ivy J
II! Because it can promote the diffusion of IO and continuously supply fresh a to its surface, Ba
The adsorption rate and saturated adsorption amount of o can be improved several times that at room temperature. To prevent this, by increasing the amount of ivy according to the amount of released gas and increasing the thickness of the Ba 8 ivy (61o) film, the gas released by many mice can be quickly absorbed and the inside of the glass container 6 can be kept under high vacuum for a long time. It is possible to obtain excellent adsorption capacity that can be maintained at

(Effects of the Invention) As explained above, according to the present invention, even if a sufficient area for fluan in the ivy cannot be obtained, the ivy film can diffuse vigorously and has a high adsorption capacity. It is possible to keep the inside of the device in a high vacuum for a long time by flooding the image display device, and it is possible to improve the performance and extend the life of the image display device.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view of a CRT, FIG. 2 is a sectional view of a conventional flat panel image display device, FIG. 3 is a sectional view of an embodiment of the present invention, and FIG. 4 is a partial sectional view of a CRT at different temperatures. 02 of Ba film
FIG. 3 is a diagram showing changes in adsorption rate of 6... Glass container, 7... Electrode specimen, 7a... Back electrode, 7b... Linear hot cathode, 8... Ba-A1 alloy, 9... Case, 10... Ha datta II. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] An image display device characterized in that a getter film is deposited by flooding the getter in the vicinity of the hot cathode where diffusion of the getter film is promoted by radiant heat from the hot cathode.