JP2004071354A - Method of manufacturing glass cap for organic el display and glass cap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a glass cap for an organic EL display manufacturable in a relatively short time and having high strength. <P>SOLUTION: The method of manufacturing the glass cap for the organic EL display comprises a process (a masking process) forming a resist layer 10 having acid resistance and sand blast resistance covering a non-forming portion of graving acting as a housing part 55 on a surface under working 1a of a glass plate 1 and forming a resist layer 20 having acid resistance over the whole surface of the other surface 1b of the glass plate 1; a process (a blasting process) cutting and forming a space 45 acting as the target housing part 55 by blasting an abrasive to the surface under working 1a of the glass plate 1; and a process (an etching process) forming the housing part by immersing the glass plate 1 with the resist layers 10, 20 attached after blasting work in an etching solution, and etching to graving depth forming the target housing part 55. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sealing cap for sealing an organic thin film of an organic EL (Electro Luminescence) display and a method for manufacturing the same, and more particularly, to a glass sealing cap formed by engraving a glass plate. (Herein referred to as “glass cap”).
[0002]
[Prior art]
As shown in FIG. 6, a display panel of an organic EL display is formed by stacking a hole transport layer 41, a light emitting layer 42, an electron transport layer 43, and the like on a glass substrate 30 in which transparent electrodes 31 are patterned in a strip shape. The structure is such that a film 40 is formed, the transparent electrode 31 (column) and the metal electrode 50 (row) are sandwiched therebetween, and pixels in a matrix are formed at the intersection of the two electrodes.
[0003]
In this display panel, the intersection of the transparent electrode 31 and the metal electrode 50 corresponds to a light emitting portion, and the light emitting material sandwiched between the positive and negative carrier transporting materials emits light.
[0004]
The surface of the substrate glass on which the pixels are mounted is covered with a sealing cap 60, and the pixels mounted on the substrate glass are protected from the external environment (see FIG. 7).
[0005]
[Problems to be solved by the invention]
This organic EL display is very weak against moisture, and when the EL element absorbs moisture, a black defect called a dark spot is generated, and this defect grows with time, resulting in a dark defect. In order to reduce the adverse effects of such moisture, the panel covered with the sealing cap described above contains N ₂ It is common to enclose a gas and further add a hygroscopic agent such as BaO. Therefore, the above-mentioned sealing cap is provided with a space 45 as a storage portion 55 for enclosing them.
[0006]
As a sealing cap having such a space 45, a metal (SUS) cap (metal cap) is generally used, but has the same coefficient of thermal expansion as the substrate glass 30. The reason is that it is easy to adhere when laminating, the airtightness and heat shock of the panel are improved, and the thickness of the panel can be made thinner than the metal cap, so that the overall thickness of the panel can be reduced. Therefore, use of a sealing cap (glass cap) made of glass has been studied.
[0007]
In this glass cap, a storage portion 55 is formed in glass having a thickness of 0.7 mm to 1.1 mm according to the thickness of the moisture absorbent so that the space 45 for disposing the moisture absorbent can be secured. The engraving is formed, and as a method of forming the engraving, a wet etching method, a sand blast method, and a working molding method have been studied. However, each of these processing methods has the following problems.
[0008]
(1) Wet etching method
Among the above-mentioned processing methods, the wet etching method is a method of covering a glass plate with a dry film photoresist (DFR) except for a portion for forming the above-mentioned engraving serving as the storage portion 55 and having a concentration of 10 to 30%. And immersed in an etching solution composed of hydrofluoric acid to etch portions not covered with DFR.
[0009]
However, the formation of a resist layer using DFR is costly, and in the case of the wet etching method, it takes a relatively long time to complete the etching. To etch to the depth, it is necessary to soak in soda lime glass for 60 to 90 minutes and non-alkali glass for 120 to 180 minutes.
[0010]
In addition, when immersed in the etchant, the etchant enters the gap between the DFR and the glass plate, and so-called "side etching" occurs in which etching proceeds to a portion covered by the DFR.
[0011]
As a method of eliminating the side etching, for example, a method of forming a metal film on the surface of a glass plate in advance, forming a DFR, and etching the glass plate together with the metal film has been studied. The number of steps required for forming the metal film increases, and the processing time further increases because the metal film must be etched.
[0012]
(2) Sandblast method
In the sand blast method, as in the case of the above-described wet etching method, the non-engraved non-formed portion serving as the storage portion 55 on the glass plate is covered with, for example, DFR, and an abrasive is projected onto the coated glass plate. Thus, the storage portion 55 is formed by cutting a portion of the plate glass not covered with the DFR.
[0013]
This sandblasting method has the advantages that the processing time is shorter than that of the above-described wet etching method and that side etching hardly occurs. However, as in the case of the wet etching method, DFR is used as a mask material. If so, the cost is high.
[0014]
Further, when the storage portion 55 is formed by the sandblasting method, since the processed portion has fine irregularities, the storage portion 55 is relatively easily cracked when the storage portion 55 is deepened and the wall thickness is reduced. Has the disadvantage that the strength of the glass cap is low.
[0015]
(3) Forming method
The process molding method is to heat a glass plate in a heating furnace and then press a ceramic mold on the heated glass plate to obtain a glass cap of a desired shape. A glass cap of a corresponding desired shape can be manufactured accurately.
[0016]
However, in the case of using this method, a heating furnace for heating the glass plate is necessary, and it is necessary to prepare a mold separately according to the size of the glass plate and the engraving depth to be the storage portion 55. There is a lot of initial investment required.
[0017]
In addition, since the processing involves pressing the mold at the softening point temperature of the glass, holding the mold for about one hour, and slowly cooling, the production requires a relatively long time.
[0018]
In addition, the inventors of the present invention can solve the disadvantage that the strength of the glass cap obtained by the sandblasting method described above is low by melting the surface of the portion cut by sandblasting with hydrofluoric acid treatment to improve the surface smoothly. However, if the DFR for sandblasting resistance used during sandblasting is used as it is as the DFR for etching with hydrofluoric acid, the DFR peels off and the desired etching cannot be performed. A new problem that sandblasting and wet etching cannot be performed continuously, such as the necessity of removing a DFR for wet etching and forming a DFR for wet etching again.
[0019]
In the case of sandblasting, even if air bubbles are present in the adhesive part, the object is achieved if the adhesive is not peeled off, but in the case of hydrofluoric acid treatment, if air bubbles come into contact with the adhesive, even if the adhesive strength is high, there is a gap Fluorine acid is eroded from the film and peels off. It is considered that the DFR has weak liquid-tightness due to the adhesive force of the adhesive portion and a weak function of repelling hydrofluoric acid.
[0020]
Accordingly, a first object of the present invention is to provide a glass cap for an organic EL display which can be manufactured in a relatively short time and has high strength, and a method for manufacturing the same.
[0021]
Another object of the present invention is to solve the problem newly generated in the process of achieving the first object, in which sandblasting and wet etching cannot be performed in a continuous process by masking with DFR. It is an object of the present invention to provide a glass cap for an organic EL display and a method for manufacturing the same.
[0022]
[Means for Solving the Problems]
In order to achieve the above object, the glass cap of the organic EL display of the present invention has a structure in which a hole transport layer, a light emitting layer, an electron transport layer, and the like are laminated on a glass plate on which a transparent electrode provided in a general glass cap is patterned. An organic film is formed between the transparent electrode and the metal electrode, and a matrix pixel is formed at the intersection of the two electrodes. Positive and negative carrier transport is performed at the intersection of the transparent electrode and the metal electrode. A glass for an organic EL display having a light-emitting material sandwiched between materials, a surface on which the pixels of the glass plate are mounted is covered with a sealing cap, and a storage portion for storing and enclosing a moisture absorbent is provided. In the cap,
A resist layer having acid resistance and sand blast resistance is formed on a surface to be processed of the glass plate as a material, the resist layer covering a non-engraved portion serving as the storage portion, and on the other surface of the glass plate. A resist layer having acid resistance is formed over the entire surface thereof, and further, a space formed by cutting an abrasive on the surface to be processed of the glass plate, and the glass plate after the cutting is performed. Further, a storage portion is formed by immersing the space in an etching solution with the respective resist layers adhered thereto, and etching the space to a further engraved depth serving as a target storage portion.
[0023]
In addition, the method for manufacturing a glass cap of an organic EL display according to the present invention is provided with acid resistance and sand blast resistance on a surface to be processed 1a of a glass plate 1 serving as a material to cover a non-engraved portion serving as a storage portion 55. Forming a resist layer 10 on the other surface 1b of the glass plate 1 and forming a resist layer 20 having acid resistance over the entire surface (masking step);
An abrasive is projected onto the processing surface 1a of the glass plate 1 to cut a space to be a target storage portion 55 by subtracting a constant engraving depth by the etching process from the thickness of the glass plate. The glass plate 1 after the step of forming the space 45 (blasting step) and the cutting of the space 45 by the abrasive in the above step is performed while the resist layers 10 and 20 are adhered. A step (etching step) of immersing in the liquid and etching to a target engraving depth to become the storage section 55 to form the storage section 55 (claims 1 and 2).
[0024]
In the above-mentioned masking step, the masking sheet comprising a base layer having sandblast resistance and an adhesive layer having acid resistance is attached to the surface 1a to be processed of the glass plate 1, whereby the glass plate A resist layer 10 having a two-layered structure of an acid-resistant resist layer 11 composed of the adhesive layer and a sandblast-resistant resist layer 12 composed of the base material layer is formed on a surface to be processed. ).
[0025]
In place of the above-described configuration, a step of forming an acid-resistant resist layer 11 by printing on the processing surface 1a of the glass plate 1 in the masking step, and a step of forming a sandblast-resistant layer on the acid-resistant resist layer 11 by printing. By forming the resist layer 12, the resist layer 10 including the acid-resistant resist layer 11 and the sandblast-resistant resist layer 12 may be formed on the surface 1a to be processed of the glass plate 1. 4).
[0026]
Preferably, the acid-resistant resist layer 11 formed on the processing surface 1a of the glass plate 1 is formed of a material that is insoluble in water and easily soluble in warm water. (Claim 5).
[0027]
The etching solution used in the etching may be a hydrofluoric acid concentration of 40 to 70% or a mixed acid solution of the hydrofluoric acid and at least one acid selected from phosphoric acid, sulfuric acid, hydrochloric acid and nitric acid. After being immersed in the etching solution for a predetermined period of time, it may be washed with cleaning water and dried, and may be etched to a target engraving depth to form a storage portion. In this case, a concentration of 50 to 60% is used. A mixed acid solution composed of hydrofluoric acid and sulfuric acid having a concentration of 70 to 98% is used, and the mixing ratio of the two is preferably 1: 1 to 3: 2 (claims 6, 9, and 11).
[0028]
Further, after immersing the glass plate 1 in the etching solution for a predetermined time, the glass plate 1 is washed with washing water and dried to form a storage section 55. At this time, the step of immersing in the etching solution after the washing and drying may be repeated to form the storage section by etching to the target engraving depth to be the storage section 55 (claim 10).
[0029]
It is preferable that the washing with the washing water is performed by applying vibration to the washing water in which the glass plate 1 is immersed (claim 7).
[0030]
It is preferable that the etching and the cleaning be performed at a temperature of 5 to 25 ° C. for the etching solution and a temperature of 38 ° C. or higher for the cleaning water (claim 8).
[0031]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, the method for manufacturing the glass cap of the organic EL display of the present invention will be described below step by step.
[0032]
[Embodiment 1]
(1) Preparation and cleaning of glass plate
The glass plate 1 as a material of the glass cap is preferably made of the same material as the glass substrate 30 on which the organic film is mounted, such as soda lime glass and non-alkali glass. By using the glass plate 1 made of a material, the expansion coefficients of the glass substrate 30 and the glass cap 60 are the same, and sealing can be performed well.
[0033]
A glass plate 1 serving as a glass cap, for example, in the present embodiment, a 0.7 mm-thick non-alkali glass plate is firstly used to remove dust, water residue, and oils adhering to its surface. Washing is performed sufficiently and dried. In this state, the preparation of the glass plate 1 serving as the material of the glass cap is completed.
[0034]
(2) Masking
As described above, the glass plate 1 that has been washed and dried has the blast resistance and the blast resistance on the non-formed portion of the storage portion 55 in the processed surface 1 a on which the engraving to be the storage portion 55 is formed. A resist layer 10 having acid resistance is formed, and a resist layer 20 having acid resistance is formed on the entire surface 1b of the glass plate 1 on the opposite side 1b. At the time of wet etching, the portions covered with the resist layers 10 and 20 are prevented from being processed.
[0035]
(2-1) Sticking masking sheet
In the present embodiment, the resist layer 10 formed on the surface (the processed surface 1b) of the glass plate 1 on the side where the engraving to be the storage portion 55 is performed is a layer having acid resistance (in the present specification, " This embodiment has a two-layer structure of an acid-resistant resist layer 11) and a layer 12 having a sandblast-resistant property (hereinafter referred to as a “sandblast-resistant resist layer”) 12 further formed on the surface thereof. In the embodiment, as shown in FIG. 1, a resist layer 10 formed on a processing surface 1a of a glass plate 1 is formed by sticking a masking sheet.
[0036]
Therefore, in the present embodiment, the masking sheet forms a resist layer, and the engraving pattern which becomes the storage portion 55 on the work surface 1a by performing cutting described later and removing unnecessary portions of the masking sheet. The formation of the resist layer is performed in accordance therewith.
[0037]
The masking sheet 10 has acid resistance, is insoluble in water at 25 ° C. to 30 ° C. or less, and has hot water of about 40 ° C. or more at one side of the base layer 12 having sand blast resistance. The masking sheet 10 is adhered to the work surface 1a of the glass plate 1 to form an acid-resistant resist layer composed of the pressure-sensitive adhesive layer 11. And a sandblast-resistant resist layer composed of the base material layer 12 are simultaneously formed on the glass plate 1.
[0038]
On the other surface 1b of the glass plate 1, a masking sheet having acid resistance is stuck to form a resist layer.
[0039]
As the pressure-sensitive adhesive layer 11 having such acid resistance, for example, an acrylic solvent-type pressure-sensitive adhesive can be used. As the base layer 12 having blast resistance, for example, a vinyl chloride-based film or sheet can be used. Can be used.
[0040]
In the present embodiment, a masking sheet including an adhesive layer 11 having acid resistance and a base layer 12 having sandblast resistance is used.
[0041]
On the other surface 1b of the glass plate 1, a masking sheet 20 using PVC as a base material layer 22 is used as a masking sheet 20 having acid resistance.
[0042]
The above-mentioned masking sheets 10 and 20 are respectively adhered to both surfaces 1a and 1b of the glass plate 1 as a material by a laminating machine.
[0043]
(2-2) Cutting of masking sheet
Among the masking sheets 10 and 20 adhered to the glass plate 1 as described above, the masking sheet 10 adhered to the side to be engraved to be the storage section 55, that is, the masking sheet 10 adhered to the processing surface 1a of the glass plate 1 This is cut by a precision cutting machine according to a pattern input to a computer without damaging the glass sheet 1.
[0044]
(2-3) Removal of unnecessary portion of masking sheet
Since the cut masking sheet 10 is cut according to the pattern of the engraved portion serving as the storage portion 55, the sheet of the engraved portion serving as the storage portion 55 is removed, and the masking sheet 10 becomes the storage portion 55 of the glass plate 1. The portion for forming the engraving is exposed as shown in FIG.
[0045]
The adhesive of the masking sheet 10 adheres to the mark where the unnecessary portion of the masking sheet 10 is removed, or the oil of the hand that adheres when removing the unnecessary portion of the masking sheet 10 adheres. Therefore, after the dirt is wiped off with a dedicated solvent, alcohol, or the like, the appearance inspection or the dimensional inspection is performed, and the masking of the glass plate 1 is completed.
[0046]
(3) Processing by sandblasting
In this way, the blast machine is used to blast the abrasive onto the glass plate 1 on which masking has been completed, and the exposed portion of the work surface 1a from which the masking sheet 10 has been removed is cut.
[0047]
In the present embodiment, the cutting by the blast is performed by using a fine powder abrasive which is sprayed together with the compressed air, and by using a constant feed conveyor type blast machine capable of feeding the glass plate 1 as a work in a fixed amount. Performs stable, high-precision sandblasting.
[0048]
As the fine powder abrasive used, a relatively high hardness fine powder abrasive is used, and for example, alumina oxide, WA, and carbon random # 150 to # 600 (90 μm to 40 μm) are used.
[0049]
The cutting by the sand blast method is performed so that a margin is slightly left in the engraved shape (broken line) as the storage portion 55 to be finally formed as shown in FIG. 3, and specifically, is finally obtained. The engraving depth is set to be slightly shallower with respect to the engraving depth serving as the storage section 55. In the present embodiment, the engraving depth is set at 0.25 mm with respect to the engraving depth 0.3 mm which becomes the storage section 55 formed. The processing time and the like are adjusted so as to obtain the depth.
[0050]
In this way, by making the cutting depth by the sandblasting method a little shallower than the engraving depth that becomes the storage portion 55, the time required for engraving can be reduced as much as possible, and the side etching can be relatively performed. After the cutting shape of the space 45 serving as the storage portion 55 is substantially determined by the sand blasting method, which is unlikely to occur, a later-described wet etching is performed. Can be engraved. In addition, in the sand blasting process, the dimensional control in the depth direction is easier and more stable than hydrofluoric acid treatment, so the blast cutting amount is increased and the hydrofluoric acid processing time is shortened. In addition, the burden on environmental measures such as wastewater treatment can be reduced.
[0051]
(4) Wet etching
The glass plate 1 on which sand blasting has been completed as described above is washed with water and dried in order to completely remove abrasives and cutting powder attached to the glass 1 during sand blasting.
[0052]
The glass plate 1 from which the abrasive and the cutting powder have been removed in this manner is left attached to any of the above-mentioned masking sheets 10 and 20, and is exposed to an etching solution composed of a mixed acid solution containing a high concentration of hydrofluoric acid as a main component. By wet etching performed by repeating immersion and washing several times, etching is performed under strictly controlled conditions until the required engraving depth for the storage portion 55 is obtained.
[0053]
The mixed acid solution used as an etching solution is hydrofluoric acid alone or a mixed solution of the hydrofluoric acid and at least one acid of phosphoric acid, sulfuric acid, hydrochloric acid, and nitric acid. % And 40% sulfuric acid are used.
[0054]
Generally, hydrofluoric acid used for wet etching is diluted to a concentration of about 10 to 30%, but by using a mixed acid solution having a high concentration as described above, wet etching can be performed in a relatively short time. Can be completed. Further, the immersion time in the etching solution is short, and the adhesive layer 11 of the masking sheet 10 adhered to the glass plate 1 is not dissolved, so that it is possible to prevent the masking sheet from peeling off from the glass plate 1.
[0055]
The temperature of the etching liquid and the cleaning water used for this wet etching are both strictly controlled. For example, the etching liquid is controlled at a temperature of 5 to 25 ° C., and the cleaning water is controlled at a temperature of 40 ° C. or higher. I have.
[0056]
Such temperature control of the etching solution and the cleaning water is such that hydrofluoric acid in the etching solution is easily evaporated by reaction heat, and that the pressure-sensitive adhesive layer 11 of the masking sheet 10 has a temperature higher than 40 ° C. It is performed because it shows easy solubility. By strictly controlling the temperature of the etching solution and the cleaning solution to the above-mentioned temperature, the concentration of the etching solution is prevented from changing and the etching is always performed at a constant speed. At the same time, it is for preventing the masking sheet 10 from peeling off and forming a sculpture in the glass plate 1 as an accurate storage portion 55.
[0057]
At the time of cleaning with the above-mentioned cleaning water, the cleaning liquid is applied to the cleaning water by ultrasonic cleaning or other methods to improve the cleaning ability, thereby almost completely removing the etching liquid attached to the glass plate 1. The erosion of the glass plate 1 is prevented from progressing.
[0058]
Further, the glass plate 1 after the water washing is sufficiently dried and immersed in an etching solution to prevent the washing solution from being mixed into the etching solution to dilute the etching solution. The drying of the glass plate 1 is performed by blowing dry air, preferably by blowing hot air.
[0059]
In this manner, the glass plate 1 is repeatedly immersed in the etching solution and washed with the washing water, and is subjected to wet etching until the glass plate 1 reaches the engraving depth to be the remaining storage portion 55 left during the cutting by sandblasting. The engraving to become the storage portion 55 is performed, and the inner surface of the engraved portion, which is the space 45 that has been finely uneven after cutting by sandblasting, is formed into a smooth shape by etching with hydrofluoric acid.
[0060]
As described above, fine irregularities formed on the inner surface of the cut portion of the space 45 are removed, and as a result, the strength of the manufactured glass cap is improved.
[0061]
(5) Removal of masking sheet
In this manner, when the etching of the glass plate 1 is completed until the engraving depth becomes the predetermined storage portion 55, the masking sheets 10, 20 stuck on both surfaces of the glass plate 1 are removed.
[0062]
The removal of the masking sheets 10 and 20 may be performed, for example, by washing with a dedicated stripping solution corresponding to the properties of the adhesive used for the masking sheets 10 and 20. In the case of using a masking sheet provided with an adhesive layer exhibiting easy solubility with respect to water, this is easily peeled off by washing with warm water, in the above-mentioned example, with warm water of 40 ° C. or more. be able to.
[0063]
The glass sheet 1 from which the masking sheets 10 and 20 have been removed in this way and which have been cleaned is subjected to a quality inspection, thereby measuring dimensions, inspecting appearance such as presence of scratches, stains, stripes and chips. And a glass cap that satisfies a predetermined quality as a result of the appearance inspection is a product.
[0064]
[Embodiment 2]
In the embodiment described above, an example is shown in which the masking sheets 10 and 20 are attached to the surfaces 1a and 1b of the glass plate 1 in order to form a resist layer on the glass plate 1 serving as a glass cap. In the embodiment, a resist layer is formed on the glass plate 1 by using a printing technique such as screen printing instead of attaching the masking sheet described above.
[0065]
In this manner, by forming the resist layer by printing, the resist layer can be formed directly on the portion of the processing surface 1a of the glass plate 1 where the engraving serving as the storage portion 55 is not formed. A step of making a cut in the masking sheet 10 that was indispensable, a step of peeling off and removing unnecessary portions of the masking sheet 10 along the cut, and subsequent steps such as cleaning of the glass plate 1 are unnecessary. Thus, the manufacturing process of the glass cap can be further simplified.
[0066]
The formation of the resist layer by printing is performed in such a manner that an acid-resistant resist material diluted with a solvent or the like and liquefied with a solvent or the like is first left on the surface 1a to be processed of the glass plate 1 except for a portion for forming the engraving serving as the storage portion 55. Is printed and dried to form an acid-resistant resist layer. As the resist material applied by printing in this way, for example, a paraffin chloride or a synthetic rubber material is used.
[0067]
Further, on the acid-resistant resist layer formed as described above, a sandblast-resistant resist material, which was similarly diluted with a solvent or the like and liquefied, was printed thereon, and a sandblast-resistant resist layer was formed. By forming a resist layer composed of these two types of layers on the surface to be processed of the glass plate, the surface of the glass plate covered with the resist layer is subjected to erosion or the like in both cases of sandblasting and wet etching. It is configured not to be done.
[0068]
As a resist agent having sandblast resistance, for example, a urethane-based material applied and dried is used.
[0069]
Further, the other surface 1b of the glass plate 1 is coated with the above-described acid-resistant resist material on the entire surface, and becomes a storage portion 55 for the glass plate 1 when immersed in an etching solution during wet etching. The surface 1b where no engraving is formed is cured so as not to be eroded.
[0070]
The formation of the resist layer on the surface 1b on which the engraving is not formed may be performed by attaching the masking sheet 20 in the same manner as in the first embodiment.
[0071]
As described above, when the masking sheet 10 is used as in the above-described embodiment by forming the resist layer directly on the non-engraved non-formed portion that becomes the storage portion 55 on the glass plate 1 by printing, The masking sheet 10 is cut into a predetermined shape, an unnecessary portion of the masking sheet 10 is peeled and removed according to the cut shape, and an adhesive or a hand is removed from the surface 1a of the glass plate 1 after removing the unnecessary portion of the masking sheet 10. Although it was necessary to wipe off the oil and the like, these steps can be omitted.
[0072]
The other steps are the same as those in the above-described embodiment, and thus the description thereof will be omitted.
[0073]
(Test example)
FIGS. 4 and 5 show the strength test and the results of the glass cap of the organic EL display of the present invention in the above-described embodiment, in which average values were obtained for six samples (the numbers in the graph are average values).
Sample: No alkali
0.7mm thick
0.3mm depth
Sandblasting process: abrasive: carborundum (100 μm)
Processing pressure 0.5Mpa,
Hydrofluoric acid solution bath temperature: 10 ° C
[0074]
As a result of the strength test, it can be seen from FIG. 4 that the material subjected to sandblasting and hydrofluoric acid treatment for about 8 minutes has a strength approximately five times that of the material subjected to blast treatment.
[0075]
【The invention's effect】
With the configuration of the present invention described above, it was possible to provide a method for manufacturing a glass cap for an organic EL display, which can be manufactured in a relatively short time and can obtain a high-strength glass cap.
[0076]
In addition, when the method for manufacturing a glass cap is performed, sand blasting and wet etching can be performed as a continuous process, and a manufacturing method capable of obtaining a glass cap for a high-strength EL display in a shorter time is provided. We were able to.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view of a glass plate on which a resist layer is formed.
FIG. 2 is a schematic cross-sectional view of a glass plate after cutting of a resist layer is completed.
FIG. 3 is a schematic cross-sectional view of the glass plate after sandblasting is completed.
FIG. 4 is a schematic view showing a method of a strength test.
FIG. 5 is a graph showing strength test results.
FIG. 6 is a sectional perspective view showing the structure of an organic EL display.
FIG. 7 is an explanatory diagram of a glass cap of the organic EL display.
[Explanation of symbols]
1 glass plate
1a Work surface
1b The other surface
10 Masking sheet (resist layer)
11 Adhesive layer (acid-resistant resist layer)
12 Base layer (sandblast resistant resist layer)
20 Masking sheet (resist layer)
21 Adhesive layer
22 Base material layer
30 glass substrate
31 Transparent electrode (column)
40 Organic film
41 hole transport layer
42 light emitting layer
43 Electron transport layer
45 space
50 Metal electrode (row)
55 storage
60 Glass cap (sealing cap)

Claims (12)

On the surface of the glass plate to be processed, a resist layer having acid resistance and sand blast resistance covering the non-engraved portion serving as a storage portion is formed, and on the other surface of the glass plate, the entire surface is formed. Forming a resist layer having acid resistance over
A cutting step of projecting an abrasive on the surface to be processed of the glass plate to form a space,
The glass plate after the cutting of the space by the abrasive in the process is immersed in an etchant while the respective resist layers are adhered, and etched to a target engraving depth serving as a storage portion. A method for manufacturing a glass cap for an organic EL display, comprising a step of forming a storage portion. 2. The glass for an organic EL display according to claim 1, wherein the cutting depth of the space by the projection of the abrasive is a value obtained by subtracting a constant engraving depth by the etching process from a thickness of the glass plate. Cap manufacturing method. By sticking a masking sheet comprising a base layer having sandblast resistance and an adhesive layer having acid resistance to the surface to be processed of the glass plate, the adhesive layer is formed on the surface to be processed of the glass plate. 3. A glass cap for an organic EL display according to claim 1, wherein a resist layer having a two-layer structure of an acid-resistant resist layer composed of: and a sandblast-resistant resist layer composed of the base layer is formed. Method. Forming an acid-resistant resist layer by printing on the processed surface of the glass plate, and forming a sandblast-resistant resist layer by printing on the acid-resistant resist layer; The method for producing a glass cap for an organic EL display according to any one of claims 1 to 3, wherein the resist layer including two layers, an acid-resistant resist layer and a sandblast-resistant resist layer, is formed. The acid-resistant resist layer formed on the surface to be processed of the glass plate is insoluble in water at 25 to 30 ° C. or lower, and is formed of a material that is easily soluble in warm water. The method for producing a glass cap for an organic EL display according to any one of claims 3 to 4, wherein: An etching solution used in the etching is a hydrofluoric acid concentration of 40 to 70% or a mixed acid solution of hydrofluoric acid and at least one acid selected from phosphoric acid, sulfuric acid, hydrochloric acid and nitric acid, and etching the glass plate by the etching method. The storage part is formed by immersing in a liquid for a predetermined time, then washing with cleaning water and drying, and etching to an engraved depth to be a target storage part to form a storage part. Of manufacturing a glass cap for an organic EL display. 7. The method according to claim 6, wherein the cleaning with the cleaning water is performed by applying vibration to the cleaning water in which the glass plate is immersed. 8. The method of manufacturing a glass cap for an organic EL display according to claim 6, wherein the etching and the cleaning are performed at a temperature of 5 to 30 [deg.] C. for the etchant and 40 [deg.] C. or more for the cleaning water. 7. The method according to claim 6, wherein the etching solution used in the etching is a mixed acid solution comprising 50 to 60% hydrofluoric acid and 70 to 98% sulfuric acid. . After the glass plate is immersed in the etching solution for a predetermined time, the glass plate is washed and washed with cleaning water, dried, and then repeatedly immersed in the etching solution. The method for producing a glass cap for an organic EL display according to any one of claims 1 to 5, wherein: The method according to claim 9, wherein a mixing ratio of the hydrofluoric acid and the sulfuric acid is 1: 1 to 3: 2. A resist layer having acid resistance and sand blast resistance is formed on a surface to be processed of the glass plate as a material, the resist layer covering a non-engraved portion serving as the storage portion, and on the other surface of the glass plate. And a resist layer having acid resistance is formed over the entire surface thereof, and further, a space formed by cutting an abrasive on the surface to be processed of the glass plate,
The glass plate after the cutting was performed was immersed in an etchant with the respective resist layers attached to the glass plate, and the space was further etched to an engraved depth to be a target storage portion. A glass cap for an organic EL display, comprising a storage part.

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