JP2007328956A - Image display device and method of manufacturing image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an image display device improved in adhesiveness of a getter material powder and the adhering surface and capable of maintaining a high display performance for a long period. <P>SOLUTION: This is a method of manufacturing the image display device provided with a housing having a front substrate with a display surface and a rear substrate arranged opposed to the front substrate, and a getter layer installed in the housing. After minute concave and convex shapes are formed on the surface of a member on which the getter layer is formed, the getter material powder is adhered to it. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image display device, and more particularly, to a method for manufacturing an image display device including a front substrate and a back substrate that are arranged to face each other.

  In recent years, various flat-type image display devices have attracted attention as next-generation lightweight and thin display devices. For example, a plasma display (PDP) using phosphor emission due to a discharge phenomenon and a field emission display (hereinafter referred to as FED) mainly using electron emission by an electric field are known.

  These image display devices include, as a basic configuration, a front substrate and a rear substrate that are arranged to face each other at a predetermined interval, and these substrates constitute an envelope by joining peripheral portions to each other. In particular, the FED enables good image display by maintaining the space between the front substrate and the rear substrate, that is, the inside of the envelope at a high degree of vacuum. In PDP, it is an important technique to keep the inert gas filling the inside of the envelope with high purity.

  For example, in order to maintain the inside of an FED envelope in a high vacuum for a long period of time, a technique is known in which various getter materials that adsorb released gas are provided in the envelope.

  As a method of providing the getter material in the envelope, conventionally, in order to improve the gas adsorption property of the getter material, the getter material is deposited on the inner surface of the front substrate or the rear substrate or other structures in a vacuum processing apparatus. A method of forming an envelope by forming a vapor deposition type getter layer and sealing both substrates in a vacuum has been proposed (see, for example, Patent Document 1).

In addition, as a non-evaporable getter layer, a method of adhering getter material powder using colloidal silica has been proposed. However, sufficient adhesion characteristics cannot be obtained, and the getter material powder falls and moves due to vibration and Coulomb force, which adversely affects the withstand voltage characteristics and screen defects.
JP 2001-229824 A

  The present invention has been made in view of the above circumstances, and its purpose is to improve the adhesion of the getter material powder, prevent the getter material powder from dropping due to vibration and Coulomb force, and display high over a long period of time. An object of the present invention is to provide an image display device capable of maintaining performance and a method for manufacturing the image display device.

An image display device manufacturing method according to the present invention includes an envelope having a front substrate provided with a display surface, a rear substrate disposed opposite to the front substrate, and a getter layer provided in the envelope. In the manufacturing method of the image display apparatus provided,
After the formation of minute irregularities on the surface of the member on which the getter layer is formed, getter material powder is adhered.

The image display device of the present invention includes an envelope having a front substrate provided with a display surface, a rear substrate disposed opposite to the front substrate, and a getter layer provided in the envelope. In the provided image display device,
The getter layer is formed by adhering getter material powder after forming minute irregularities on the surface of the member on which the getter layer is formed.

  As described above, according to the present invention, it is possible to obtain an image display device that improves the adhesive force between the getter material powder and the adhesive surface and maintains high display performance over a long period of time.

  Hereinafter, a display device according to an embodiment of the present invention will be described with reference to the drawings, taking an FED having a surface conduction electron-emitting device as an example.

  FIG. 1 is a perspective view showing an example of an FED according to the present invention.

  FIG. 2 is a cross-sectional view taken along the line A-A ′.

  As shown in FIGS. 1 and 2, this FED includes a front substrate 11 and a rear substrate 12 each made of a rectangular glass plate as insulating substrates, and these substrates are arranged to face each other with a gap of 1 to 2 mm. Has been. The front substrate 11 and the back substrate 12 constitute a flat rectangular vacuum envelope 10 whose peripheral portions are bonded to each other via a rectangular frame-shaped side wall 13 and the inside is maintained in a vacuum state. .

  A plurality of spacers 14 are provided inside the vacuum envelope 10 in order to support an atmospheric pressure load applied to the front substrate 11 and the rear substrate 12. As the spacer 14, a plate-like or columnar spacer or the like can be used.

  On the inner surface of the front substrate 11, a phosphor screen 15 having red, green and blue phosphor layers 16 and a matrix-shaped light shielding layer 17 is formed as an image display surface. These phosphor layers 16 may be formed in stripes or dots. A metal back 20 made of an aluminum film or the like is formed on the phosphor screen 15. Further, in order to lower the internal pressure of the vacuum envelope 10, a getter film 21 is formed to adsorb unnecessary gas inside. The getter powder is mixed with an adhesive material.

  On the inner surface of the back substrate 12, a number of surface conduction electron-emitting devices 18 that emit electron beams are provided as electron sources that excite the phosphor layer 16 of the phosphor screen 15. These electron-emitting devices 18 are arranged in a plurality of columns and a plurality of rows corresponding to each pixel. Each electron-emitting device 18 includes an electron emitting portion (not shown) and a pair of device electrodes for applying a voltage to the electron emitting portion. Further, on the inner surface of the back substrate 12, a large number of wirings 21 for supplying a potential to the electron-emitting devices 18 are provided in a matrix shape, and the end portions are drawn out of the vacuum envelope 10.

  In such an FED, when an image is displayed, an anode voltage is applied to the phosphor screen 15 and the metal back 20, and an electron beam emitted from the electron emitter 18 is accelerated by the anode voltage to collide with the phosphor screen. As a result, the phosphor layer 16 of the phosphor screen 15 is excited to emit light and display a color image.

  If the getter layer is formed in a place where the electron beam trajectory from the electron source is obstructed, the luminance of the phosphor screen is lowered.

  For example, a zirconium alloy having an average particle diameter of 1 μm to 10 μm is prepared as the getter material powder.

  Fine irregularities having a surface irregularity of about 1 μm are formed on the surface to which the getter material powder is adhered, such as a light shielding layer or a metal back, with chemicals or blasting.

  3 and 4 are schematic cross-sectional views showing the process of forming the getter layer.

  As shown in the drawing, minute irregularities 31 are formed in the surface region where the getter material powder on the light shielding layer 30 is adhered.

  The minute irregularities preferably have, for example, a surface irregularity of about 1 μm to 10 μm.

  If the thickness is less than 1 μm, the hook-like connection effect cannot be obtained and the adhesive strength tends to be weak. If the thickness exceeds 10 μm, a film in which getter agent powder and colloidal silica enter the concave portion cannot be obtained and the adhesive strength is weakened. Tend.

  In addition, this surface unevenness | corrugation is measured by scanning the surface with a laser length measuring machine.

  Next, a solution obtained by mixing the getter material powder 32 and the colloidal silica 33 is patterned into minute irregularities to form the getter layer 21.

  According to the present invention, colloidal silica flows along the unevenness, the getter material powder and the adhesive are mixed without unevenness, the concentration of the adhesive becomes uniform with respect to the getter material powder, and a stable film is formed. The adhesion between the material powder and the bonding surface is improved.

  Further, when the adhesive enters the minute irregularities on the surface, the adhesive surface and the adhesive are connected in a hook shape, and a strong film is obtained.

  In addition, according to the present invention, it is possible to improve the adhesion of the getter material powder, prevent the getter material powder from dropping and moving due to vibration and Coulomb force, and obtain an FED capable of maintaining high display performance over a long period of time. Is possible.

  At this time, the getter layer was about 20 μm thick.

  The thickness of the getter layer is preferably 5 μm to 50 μm, and if it is less than 5 μm, the gas adsorption capacity tends to be insufficient, and if it exceeds 50 μm, the counter substrate tends to be discharged.

  As the non-evaporable getter material, one or more metals or alloys of titanium, zirconium, vanadium, iron, aluminum, chromium, niobium, tungsten, molybdenum, nickel, and manganese can be used.

  The blending weight ratio between the getter material powder and the colloidal silica is preferably, for example, 1: 0.5 to 1: 1.

  Further, the obtained getter layer is heat-treated at a temperature of, for example, 50 ° C. to 120 ° C., whereby a uniform film having a good surface condition can be obtained.

  In addition, the colloidal silica enters the surface micro unevenness, and the adhesive surface and the colloidal silica are connected in a hook-like shape, resulting in a strong film. The adhesion of the getter layer according to the invention was improved by 80%.

  At this time, as a conventional product, a zirconium alloy was used as a getter material, a solution mixed with colloidal silica at 1: 0.5 was prepared, and a getter layer was formed by stretching smoothly while being dispersed on an evaluation substrate.

  The adhesion of the getter layer was measured by sticking a sheet with an adjusted adhesive concentration to the getter layer, pressurizing with an equal load, and comparing the areas of the getter layer attached to the sheet side.

  According to the embodiment configured as described above, when the colloidal silica enters the minute irregularities, the adhesive surface and the colloidal silica are connected in a hook shape, and a strong film can be obtained. The strong adhesive force as described above is useful in a configuration in which the anode voltage exceeds 10 kV and the peeling force due to the Coulomb force acts strongly like the FED.

  In the above-described embodiment, the FED including the front substrate having the phosphor screen on the inner surface has been described as an example of the member to be the getter film. However, the present invention is not limited to this, and the SED, PDP The present invention can also be applied to other devices such as other vacuum apparatuses, fluorescent display tubes, and semiconductor sensors. The material of the non-evaporable getter powder, the adhesive particles, and the insulating adhesive layer is not limited to the above embodiment, and can be used in various ways according to the vacuum characteristics, emission gas characteristics, heat resistance, etc. of the device to be used. it can.

  For example, the dimensions, materials, and the like of each component are not limited to the numerical values and materials shown in the above-described embodiment, and can be variously selected as necessary.

  The getter material is not limited to titanium, zirconium, vanadium, iron, aluminum, chromium, niobium, tungsten, molybdenum, nickel, manganese, and other metal materials, organic materials, inorganic materials, and the like can be selected.

  In addition, the getter material is not limited to the front substrate, and may be formed on other components located in the vacuum envelope.

  The present invention is not limited to the FED, and may be applied to the manufacture of other image display devices such as a PDP.

The perspective view which shows FED which is an example of the image display apparatus manufactured by the manufacturing method which concerns on embodiment of this invention. FIG. 2 is a cross-sectional view of the FED taken along line AA in FIG. 1. Schematic sectional view showing the process of forming the getter layer Schematic sectional view showing the process of forming the getter layer

Explanation of symbols

10 ... Vacuum envelope, 11 ... Front substrate, 12 ... Rear substrate,
13 ... sidewall, 15 ... phosphor screen, 18 ... electron-emitting device,
20 ... Metal back 21 ... Getter layer 30 ... Black matrix,
31 ... Adhesive surface for micro uneven processing, 32 ... Getter material powder, 33 ... Colloidal silica,

Claims (9)

In a manufacturing method of an image display device, comprising: an envelope having a front substrate provided with a display surface and a rear substrate disposed opposite to the front substrate; and a getter layer provided in the envelope.
A method for manufacturing an image display device, comprising: forming fine irregularities on a surface of a member on which the getter layer is formed, and then bonding getter material powder.   The getter material powder is made of at least one metal material selected from the group consisting of titanium, zirconium, vanadium, iron, aluminum, chromium, niobium, tungsten, molybdenum, nickel, and manganese. 2. A method for manufacturing the image display device according to 1.   The method for manufacturing an image display device according to claim 1, wherein the minute unevenness is formed on a member surface using chemicals or blasting.   4. The method of manufacturing an image display device according to claim 1, wherein colloidal silica is mixed with the getter material powder and adhered to the surface of the minute irregularities. 5.   The method for manufacturing an image display device according to claim 1, wherein the minute unevenness has a surface unevenness of 1 μm to 10 μm. In an image display device comprising: a front substrate provided with a display surface; an envelope having a rear substrate disposed opposite to the front substrate; and a getter layer provided in the envelope.
The getter layer is formed by forming minute irregularities on a surface of a member on which the getter layer is formed, and then adhering getter material powder.   The getter material powder is made of at least one metal material selected from the group consisting of titanium, zirconium, vanadium, iron, aluminum, chromium, niobium, tungsten, molybdenum, nickel, and manganese. 6. The image display device according to 6.   The image display device according to claim 5, wherein the minute unevenness is formed on a member surface using chemicals or blasting.   8. The image display device according to claim 5, wherein colloidal silica is mixed with the getter material powder and adhered to a minute uneven surface. 9.

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