JP2003217826A - Moisture adsorbent holding method for organic el display panel, glass board used in it and machining method for it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To hold a fixed quantity of moisture adsorbent in a recess of a glass board without lowering of strength. <P>SOLUTION: In covering the back of the glass board provided with an organic EL element 4 with a glass board to seal, reinforcing parts 5 formed as a protrusion or a rib are disposed on the inner surface of the glass board 1 to hold the moisture adsorbent 7 in the formed recess 6. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an organic EL (Ele)
The present invention relates to a method for holding a water adsorbent in a display panel, a glass substrate used for the method, and a method for processing the same.

[0002]

2. Description of the Related Art While progress has been made in the display technology of flat display panels, and various display elements have been developed and put into practical use, organic EL elements are self-luminous, have a wide viewing angle, and can be made thin and lightweight. It is one of the display elements that is expected to develop in the future because of its feature that power consumption can be kept low.

This organic EL element is deteriorated by water and oxygen.
Therefore, in order to prevent these intrusions, conventionally, as shown in FIG. 5, the back portion of the transparent substrate a such as glass on which the organic EL elements b are arranged is covered with a SUS cap c, and the organic EL element b is covered.
The periphery is sealed by a sealant d between the transparent substrate a and the cap c. At the same time, on the inner surface of the cap c, a moisture adsorbent f is formed in a recess e formed by pressing.
Is applied and held, and even if water intrudes or occurs, it is adsorbed by the water adsorbent f and the organic EL element is protected from water and oxygen.

On the other hand, as one of mass production, an organic EL element b and a TF for driving the organic EL element b are mounted on a large glass transparent substrate a.
A method is employed in which a large number of sets of driving elements g such as T are formed and sealed with a cap c to perform multi-production, and then each set of organic EL elements b is divided and used.

[0005]

DISCLOSURE OF THE INVENTION The inventors of the present invention have conducted various experiments by adopting the above-mentioned multi-production method, and as a result of repeated examinations, as a result, a transparent substrate a made of glass and a cap c made of metal such as SUS are obtained. It has been found that, in the case of bonding, the larger the multi-production unit, the more difficult it is to produce due to the difference in the coefficient of thermal expansion between the transparent substrate a and the cap c, and in some cases, the quality becomes poor and the production becomes impossible.

To cope with this, the present inventors have adopted the same glass substrate as the transparent substrate a for the cap c, and are similar to the metallic cap c as shown in FIGS. 6 (a) and 6 (b). A glass substrate j having a recess h was formed. By adopting this instead of the conventional cap c, the problem due to the difference in thermal expansion coefficient was solved.

However, the conventional cap c is attached to the glass substrate j.
When the multi-production is repeated by adopting the one having a thickness of about 0.7 mm in the same manner as the above, the larger the multi-production unit is, the more easily the glass substrate j is cracked, the yield is decreased, and it is practically used. I can't stand it. This is because the microcracks on the processed surface that occur during recess processing affect the glass strength, and the processed glass substrate is
This is probably because the organic EL elements b arranged on the transparent substrate a and the glass substrate j as a cap are cracked by a deflection amount larger than the gap.

An object of the present invention is to provide a method for holding a water adsorbent in an organic EL display panel capable of holding an amount of the water adsorbent in the concave portion of the glass substrate without lowering the strength, a glass substrate used for the method, and a processing method thereof. It is in.

[0009]

In order to achieve the above object, a method for holding a water adsorbent in an organic EL display panel according to the present invention comprises a glass substrate covering a back portion provided with an organic EL element and sealing. The main feature of this method is to hold the moisture adsorbent in a concave portion formed by arranging a reinforcing portion forming a protrusion or a rib on the inner surface of the glass substrate.

In such a structure, the glass substrate is provided with the recessed portion as a space for holding the water adsorbent, and is reinforced by the protrusions or the reinforcing portions forming ribs, and the strength is reduced due to the presence of the recessed portion. Will be supplemented,
The organic EL display panel is prevented from cracking during manufacture, handling and use, both yield and life are improved, and it is suitable for practical use.

In a further configuration in which the reinforcement has a height from the bottom of the recess that is about the same as or less than the depth of the recess, and in a further configuration in which the water adsorbent is held almost to the depth of the recess or up to the height of the reinforcement, the reinforcement is If the glass substrate has the same height as the depth of the recesses, the degree of reinforcement against the presence of the recesses in the glass substrate is improved, the array density of the reinforcements is correspondingly reduced, and the entire depth of the recesses is effectively used. As a result, the retention capacity of the water adsorbent can be increased. Further, if the height of the reinforcing portion is lower than the depth of the recessed portion, even when the protruding end of the reinforcing portion is exposed on the surface of the moisture adsorbent held in the recessed portion, the reinforcing portion has almost the same height as the depth of the recessed portion. Compared with a certain case, a gap is provided between the protruding end of the reinforcing portion and the organic EL element without increasing the thickness of the organic EL display panel, so that the air permeability between the protruding end of the reinforcing portion and the organic EL element is improved. As a result, it is possible to prevent the protruding end of the reinforcing portion having no water adsorbing property from coming into contact with the organic EL element and causing a partial water adsorbing failure or failure. In addition, when the moisture adsorbent is stored and held up to almost the full depth of the recess beyond the reinforcing portion having a height lower than that of the recess, the holding amount of the moisture adsorbent increases without increasing the thickness of the organic EL display panel. , Water adsorbent is organic E
Even if it contacts the L element, the water adsorption action at this contact portion is not impaired.

The glass substrate for encapsulating an organic EL display panel of the present invention is mainly characterized by having a concave portion in which a reinforcing portion forming a protrusion or a rib is arranged at a depth substantially equal to or lower than the depth on one surface side. It is what

As a result, the function as described above is exerted for holding the water adsorbent in the organic EL display panel.

In the method of processing a glass substrate for sealing an organic EL display panel of the present invention, blasting is performed on one surface side of the glass substrate through a masking resist or a mask, and a reinforcing portion forming a protrusion or a rib is left. The main feature is to form a concave portion.

With such a structure, during blasting,
Since the blasting material works and cuts the part of the glass substrate that is not covered by the masking resist or the mask, it is possible to form the concave part while leaving the reinforcing part corresponding to the masking resist or the mask pattern. By adopting a hard mask that is not cut by the blast material, the reinforcing portion according to the pattern can be easily obtained. Further, the blast-resistant masking resist or mask has an advantage that a harmful masking resist such as Cr may not be used when chemical etching with hydrofluoric acid or the like is performed.

In the blasting process, a first step of cutting the concave portion in the middle of the concave portion using a masking resist while leaving the reinforcing portion, and a second step of removing the masking resist in the concave portion region to cut the concave portion to a predetermined depth. In a further configuration including the above, the recess having the reinforcing portion lower than the depth can be formed by blasting.

In the blasting process, the first step is to form a recess having a uniform shallow depth corresponding to the difference between the height of the reinforcement and the depth of the recess, and the shallow recess is left to a predetermined depth with the reinforcement remaining. With a further configuration including the second step of forming even the concave portion of the groove, the concave portion that leaves the reinforcing portion lower than the depth can be formed by blasting.

As the masking resist, a soft masking resist material such as a rubber material cut by a blast material is used. In a further structure, a reinforcing portion having the same height as the depth is left by appropriate protection or adjustment of softness. Two steps such that the resist action is secured even by cutting the masking resist by blasting up to the step of forming the concave portion, and thereafter the masking resist is removed and the reinforcing portion is cut so as to be lower than the depth of the concave portion.
If necessary, different patterns can be blasted with a greater number of steps, which is suitable for forming recesses that leave various reinforcing portions.

Further objects and features of the invention will be apparent from the following detailed description and drawings. The respective features of the present invention can be employed alone or in combination in various combinations as much as possible.

[0020]

EXAMPLES Hereinafter, a method for holding a water adsorbent in an organic EL display panel according to the present invention and a glass substrate used for the method,
Examples of the processing method and the processing method thereof will be described with reference to FIGS. 1 to 4 to provide an understanding of the present invention. Note that the following description and drawings are specific examples of the present invention and do not limit the content of the claims.

For the method for holding the water adsorbent in the organic EL display panel of the present invention in this embodiment, refer to the glass substrate 1 and the organic EL display panel 2 using the glass substrate 1 schematically shown in FIGS. 1 (a) and 1 (b). Then, the organic E of the glass substrate 3
The L element 4 is formed by arranging a reinforcing portion 5 forming a protrusion or a rib on the inner surface of the glass substrate 1 for covering and sealing the back portion provided with the driving element 9 such as a TFT with the glass substrate 1. The moisture adsorbent 7 is held in the recessed portion 6. The reinforcing portion 5 is intended to reinforce the strength of the glass substrate 1 because the glass substrate 1 is provided with the concave portion 6 for holding the moisture adsorbent 7 without increasing the thickness of the organic EL display panel 2 on one surface thereof, Basically the recess 6
It is formed so that it fits within the space formed by. However, it does not matter if there is a problem.

As described above, the glass substrate 1 is provided with the concave portion 6 as a holding space for the water adsorbent 7, and the concave portion 6 is provided.
By compensating for the decrease in strength due to the presence of the concave portion, which is reinforced by the reinforcing portion 5 forming the protrusion or the rib and there is prevented the occurrence of cracks during manufacture, handling and use of the organic EL display panel.
Therefore, a large number of organic ELs are formed on the relatively large glass substrate 1.
Even if the elements 4 are arranged for multi-production, both the yield and the life are improved, and it is suitable for practical use in mass production.

2A and 2B, even if the reinforcing portion 5 is a columnar reinforcing portion 5a as in the example shown in FIGS. 1A and 1B.
It may be a rib-shaped reinforcing portion 5b as in the example shown in FIG.
The columnar shape of the reinforcing portion 5a may be a straight shape or a tapered shape, and the cross-sectional shape may be a circular shape shown in the figure, or another shape such as an elliptical shape or a rectangular shape. The rib-shaped reinforcing portion 5b may be continuous or discontinuous, and it is preferable that the rib-shaped reinforcing portion 5b is provided in a plurality of directions such as vertical and horizontal directions so as not to show directionality depending on the degree of reinforcement.
As shown in (a) and (b), the reinforcing degree is improved by making them continuous in a grid pattern. Even in the case of the columnar reinforcing portion 5a, the rib-like reinforcing portion 5b can be used together to connect the narrow rib-like reinforcing portions 5b to each other to enhance the degree of reinforcement. Rib-shaped reinforcing portions 5b connecting the columnar reinforcing portions 5a form a lattice,
A pattern in which one or several columnar reinforcing portions 5a that are not connected to each other are also effective. Figure 2 (a)
In the example shown in (b), the grid has a slightly rectangular shape, but it may be a square or any other polygonal shape, or may be circular or elliptical in some cases. Since the elliptical or rectangular columnar reinforcing portions 5 and the lattices give directionality to the strength and weakness of the reinforcement, they are dispersedly arranged in two or more directions such as vertical and horizontal directions, or the strength is directional such as the glass substrate 1 is rectangular. In this case, it is preferable to disperse them so as to cancel them.

Further, in the example of the reinforcing portion 5a shown in FIGS. 1 (a) and 1 (b), the reinforcing portion 5 is formed so as to have substantially the same height as the depth of the concave portion 6 from the bottom surface of the concave portion 6, Figure 2 (a)
In the example of the reinforcing portion 5b shown in (b), the reinforcing portion 5b is formed to have a height lower than the depth of the concave portion 6. In this way, the height of the reinforcing portion 5 can be set in two ways regardless of the form, and when the moisture adsorbent 7 is accommodated and held up to the depth of the concave portion 6 or the height of the reinforcing portion 5, the reinforcing portion 5 is reinforced. Part 5 is FIG.
When the glass substrate 1 has the same height as the depth of the concave portions 6 as in the examples shown in (a) and (b), the degree of reinforcement for the glass substrate 1 having the concave portions 6 is improved, and the arrangement density of the reinforcing portions 5 is correspondingly increased. It is possible to increase the holding capacity of the water adsorbent 7 by reducing the amount of water and effectively utilizing the entire depth of the recess 6. Further, when the reinforcing portion 5 has a height lower than the depth of the concave portion 6 as in the example shown in FIGS. 2 (a) and 2 (b), the protruding end 5c of this is as shown in the example shown in FIG. 2 (b). Even when the holding form exposed on the surface of the moisture adsorbent 7 held in the recess 6 is reinforced without increasing the thickness of the organic EL display panel 2 as compared with the case where the reinforcing portion 5 has the same height as the depth of the recess 6. A space corresponding to the height of the reinforcing portion 5 lower than the depth of the recess 6 is ensured between the protruding end 5c of the portion 5 and the organic EL element 4, and the protruding end 5c of the reinforcing portion 5 and the organic EL element 4 are secured. Ventilation with the EL element 4 can be achieved. As a result, the protruding end 5 of the reinforcing portion 5 having no water adsorption
It is possible to avoid that "c" comes into contact with the organic EL element 4 and causes a partial failure or failure of water adsorption, and the life of the organic EL display panel 2 is improved. Also,
Although not shown, as shown in FIG. 2B, when the moisture adsorbent 7 is accommodated and held up to almost the full depth of the recess 6 beyond the reinforcing portion 5 which is lower than the recess 6, the organic EL display panel Even if the amount of water adsorbent 7 retained increases and the water adsorbent 7 contacts the organic EL element 4 without increasing the thickness of 2, the protruding end 5c of the reinforcing portion 5 does not directly contact. Without this, the water adsorption action at this contact portion is not impaired.

Here, the glass substrate 1 has a concave portion 6 in which a reinforcing portion 5 forming a protrusion or a rib is arranged at a depth substantially equal to or lower than the depth, so that the organic EL display panel 2 is sealed. It is applied for use on the inner surface and has a moisture adsorbent 7
Is suitable for holding. Such a processing method of the glass substrate 1 is performed by subjecting one surface side of the glass substrate 1 to blasting through a masking resist 11 or a mask as shown in FIG. Further, the recess 6 can be formed while leaving the reinforcing portion 5 forming the rib. Various materials such as sand and alumina powder can be applied to the blast material, and the masking resist 11 is usually
Use a material that is not cut by blasting material. Here, this is defined as a hard masking resist material for convenience. This has a UV curable resin, and the masking resist 11 having a predetermined pattern can be formed by printing. In FIG. 3, the masking resist material 1 is moved by moving the squeegee 14 through the screen 13 into the through hole of the mask 12.
The screen printing method of filling and printing 1a is illustrated. After printing, the mask 12 is peeled off or melted with a solvent to be removed, and then subjected to blasting in the state shown in FIG. Printing can also be performed by transfer or a coating method. Instead of such a masking resist 11, a mask made of a harder metal material can be used. For the mask, various processing methods such as laser processing and punching can be adopted.

In the blasting process, the blasting material works and cuts the masking resist 11 on the one surface side of the glass substrate 1 or a portion not covered by the mask, so that the reinforcing portion 5 corresponding to the masking resist 11 or the mask pattern is left. The recess 6 can be formed. By using the masking resist 11 or a hard masking resist that is not cut by the blasting material, the reinforcing portion 5 according to the pattern can be easily obtained. Further, the blast resistant masking resist 11 and the mask are C in the case of performing chemical etching with hydrofluoric acid or the like.
There is an advantage that harmful masking resists such as r need not be used. The finer the particles of the blast material, the higher the pattern forming accuracy, but the slower the processing speed. Therefore, a rough blast material is used in the initial stage, and the masking resist 1
It is possible to use fine particles at the final stage of following 1 or a mask pattern.

In such a blasting process, the blasting process includes the first step of cutting the recessed part 6 halfway using the masking resist 11 leaving the reinforcing part 5 and the recessed part 6.
By providing the second step of removing the masking resist 11 in the region of 4 and cutting the concave portion 6 to a predetermined depth, the concave portion 6 leaving the reinforcing portion 5 lower than the depth can be formed by blasting. .

As shown in FIG. 2 (b), the reinforcing portion 5
First step of forming a uniform recess 6a having a shallow depth corresponding to the difference between the height of the recess and the depth of the recess 6, and forming the shallow recess 6a up to the recess 6 having a predetermined depth while leaving the reinforcing portion 5. By providing the second step, the recess 6 having the reinforcing portion 5 lower than the depth can be formed by blasting. This is because a masking resist having only a window corresponding to the recess 6a is used in the first step, and a masking resist having a pattern for leaving a predetermined reinforcing portion 5 in the region of the recess 6a is used in the second step. The workability is better than that in the case where the masking resist 11 is realized by using the masking resist 11 and a part thereof is left.

Of course, the masking resist 11 may be defined as a soft masking resist material such as a rubber material cut by a blast material with respect to the hard mask resist. Thereby, by appropriately protecting or adjusting the softness, for example, the concave portion 6 having a predetermined depth, which leaves the reinforcing portion 5 having the same height as the depth, is formed as shown in FIG.
After the formation as shown in (b), the soft masking resist material is removed by continuing the blasting process, and the upper end of the reinforcing portion 5 remaining in the concave portion 6 is cut by a predetermined amount to make it lower than the depth of the concave portion 6. Can be formed to height,
It is not necessary to manually remove the masking resist 11 on the way or apply it on the way to manually switch the blast conditions. In this case, the outer peripheral portion of the area corresponding to the concave portion 6 of the masking resist 11 can be a hard masking resist. This can be dealt with by adopting a protective film or another masking resist material.

Here, three Examples 1, 2, and 3 will be shown.
In each case, a glass substrate 1 having a thickness of 0.7 mm and an area of 40 mm × 50 mm was used.

Example 1 An area of 30 mm × 40 mm was obtained by sandblasting using a masking resist having a reinforcing portion forming pattern having holes having a diameter of 2.5 mm and an arrangement pitch of 6 mm.
A concave portion having a depth of 0.3 mm was formed, and a reinforcing portion having a diameter of 2.0 mm and a height of 0.3 mm remained on the bottom surface of the concave portion and was finished. For this, two 40 mm glass substrates
Support the 5 mm range of both ends on each side with prisms,
Press the central part from above with a metal rod with a tip diameter of 3 mm,
When the load for breaking the glass substrate was measured, the breaking load was 2,300 g · f.

Example 2 An area of 3 was obtained by sandblasting using a masking resist having a reinforcing portion forming pattern having a lattice width of 1 mm and a 1 mm square lattice corresponding to the lattice-like reinforcing portion.
After forming a concave portion having a depth of 0 mm × 40 mm and a depth of 0.15 mm, only the grid-like masking resist in the inner region of the concave portion is removed and a sandblasting process is performed leaving the surrounding area, and a concave portion having a depth of 0.3 mm is formed. And a reinforcing portion corresponding to the grid pattern is formed on the bottom surface at a height of 0.1.
At a height of 5 mm, the depth was 0.15 mm lower than the depth of the recess of 0.3 mm, and finished. For this, 2 of the glass substrate
Each 5 mm area on both sides of each 40 mm side is supported by a prism, and the central part is pressed from above by a metal rod with a tip diameter of 3 mm, and the load at which the glass substrate breaks is measured. The breaking load is 1,900 g. It was f.

Example 3 Initially, a masking resist having a pattern having only a large window corresponding to a concave portion was used, and an area of 30 mm ×
After forming a uniform concave portion having a depth of 40 mm and a depth of 0.15 mm, a reinforcing portion forming pattern having a lattice width of 1 mm and 1 mm square corresponding to the lattice-like reinforcing portion was formed on the bottom of the concave portion. Sandblasting is performed by applying a hard mask to further form recesses having a depth of 0.15 mm, and a reinforcing portion corresponding to the above-mentioned grid-like pattern is formed on the bottom surface with a height of 0.15 mm as in Example 2. The recess was left at a height of 0.15 mm lower than the depth of 0.3 mm and finished. About this, both ends 5m on two 40mm sides of the glass substrate
Each of the m ranges was supported by a prism, the central portion was pressed from above with a metal rod having a tip diameter of 3 mm, and the load at which the glass substrate was broken was measured.
It was 900 g · f. However, the workability was better than in the case of Example 2, and the productivity was improved and the cost was reduced.

Comparative Example As a comparative example, a glass substrate having a recess different from that of Examples 1 to 3 was formed by blasting, except that no reinforcing portion was left, and the same conditions as those of Examples 1 to 3 were used. When the breaking load was measured with, the breaking load was 600 g
It was f.

The breaking loads of Examples 1 to 3 and the comparative example are shown in Table 1 below.

[0036]

[Table 1]

[0037]

According to the method for holding a water adsorbent of an organic EL display panel of the present invention, the glass substrate is provided with the concave portion thereof as a space for holding the water adsorbent, and at the same time, a reinforcement forming a protrusion or a rib in the concave portion. Since it is reinforced by the parts to compensate for the decrease in strength due to the presence of the recesses, it is possible to prevent cracks from occurring during manufacturing, handling and use of the organic EL display panel, improve both yield and life, and are suitable for practical use. Will be things.

In a further configuration in which the reinforcement has a height from the bottom of the recess that is about the same as or less than the depth of the recess and retains the moisture adsorbent to approximately the depth of the recess or to the height of the reinforcement, the reinforcement is If the glass substrate has the same height as the depth of the recesses, the degree of reinforcement against the presence of the recesses in the glass substrate is improved, the array density of the reinforcements is correspondingly reduced, and the entire depth of the recesses is effectively used. As a result, the retention capacity of the water adsorbent can be increased. Further, if the height of the reinforcing portion is lower than the depth of the recessed portion, even when the protruding end of the reinforcing portion is exposed on the surface of the moisture adsorbent held in the recessed portion, the reinforcing portion has almost the same height as the depth of the recessed portion. Compared with a certain case, a gap is provided between the protruding end of the reinforcing portion and the organic EL element without increasing the thickness of the organic EL display panel, so that the air permeability between the protruding end of the reinforcing portion and the organic EL element is improved. As a result, it is possible to prevent the protruding end of the reinforcing portion having no water adsorbing property from coming into contact with the organic EL element and causing a partial water adsorbing failure or failure. In addition, when the moisture adsorbent is stored and held up to almost the full depth of the recess beyond the reinforcing portion having a height lower than that of the recess, the holding amount of the moisture adsorbent increases without increasing the thickness of the organic EL display panel. , Water adsorbent is organic E
Even if it contacts the L element, the water adsorption action at this contact portion is not impaired.

The glass substrate for encapsulating the organic EL display panel of the present invention has a concave portion having a reinforcing portion forming a protrusion or a rib at a depth which is substantially equal to or lower than the depth. It exerts the action as described by being used for holding the water adsorbent in the EL display panel.

According to the processing method of the glass substrate for sealing the organic EL display panel of the present invention, the blasting material works on the portion not covered by the masking resist or the mask on the one surface side of the glass substrate during the blasting process to cut. Therefore, it is possible to form a recess while leaving the reinforcing portion corresponding to the masking resist or the pattern of the mask,
By adopting a masking resist or a hard mask which is not cut by the masking resist material, the reinforcing portion according to the pattern can be easily obtained. Further, the blast-resistant masking resist or mask has an advantage that a harmful masking resist such as Cr may not be used when chemical etching with hydrofluoric acid or the like is performed.

The blasting process includes a first step of cutting the concave portion to a predetermined depth by removing the masking resist in the concave region by using a masking resist while leaving the reinforcing portion, and a second step of cutting the concave portion to a predetermined depth. In a further configuration including the above, the recess having the reinforcing portion lower than the depth can be formed by blasting.

In the blasting process, the first step is to form a recess having a uniform shallow depth corresponding to the difference between the height of the reinforcement and the depth of the recess, and the shallow recess is left at a predetermined depth with the reinforcement remaining. With a further configuration including the second step of forming even the concave portion of the groove, the concave portion that leaves the reinforcing portion lower than the depth can be formed by blasting.

As the masking resist, a soft masking resist material such as a rubber material cut by a blast material is used. In a further structure, a reinforcing portion having the same height as the depth is left by appropriate protection or adjustment of softness. It is lower than the depth by securing the resisting action by cutting the masking resist by blasting until the step of forming the recess, and then removing the masking resist and cutting the reinforcing part so that it is lower than the depth of the recess. It is not necessary to manually change the blast condition in the middle of the recess having the height reinforcing portion.

[Brief description of drawings]

FIG. 1 shows an organic EL display panel according to one embodiment of the present invention, in which (a) is a front view of the inside of a glass substrate for sealing, and (b) is a schematic view of a cross section of the entire organic EL display panel. Is.

FIG. 2 shows a glass substrate for sealing an organic EL display panel of another embodiment of the present invention, (a) is an inner front view and (b) is a sectional view.

FIG. 3 is a sectional view schematically showing a state in which a masking resist material for blasting is printed on a glass substrate.

FIG. 4 is a cross-sectional view showing an example of a masking resist and an example of blast processing formed by printing in FIG.

FIG. 5 is a sectional view schematically showing a conventional organic EL display panel.

FIG. 6 shows an improved example in which the sealing cap of FIG. 5 is replaced with a glass substrate, in which (a) is an inner front view and (b) is a sectional view.

[Explanation of symbols]

1 glass substrate 2 Organic EL display panel 3 glass substrates 4 Organic EL element 5, 5a, 5b Reinforcement part 5c protruding end 6, 6a recess 7 Water adsorbent 9 Drive element 11 Masking resist 11a Masking resist material

Claims (7)

[Claims] 1. A concave portion formed by arranging a reinforcing portion forming a protrusion or a rib on the inner surface of the glass substrate for sealing the back portion of the glass substrate provided with the organic EL element with the glass substrate for sealing. A method for holding a water adsorbent in an organic EL display panel, which is characterized by holding a water adsorbent. 2. The reinforcing portion has a height from the bottom surface of the concave portion to approximately the same as or lower than the depth of the concave portion, and holds the moisture adsorbent up to almost the full depth of the concave portion or the height of the reinforcing portion.
7. A method for holding a water adsorbent in an organic EL display panel according to item 4. 3. A glass substrate for encapsulating an organic EL display panel, which has a concave portion in which a reinforcing portion forming a protrusion or a rib is arranged at a depth substantially equal to or lower than the depth. 4. A sealing of an organic EL display panel, characterized in that one surface of a glass substrate is blasted through a masking resist or a mask to form a recess leaving a reinforcing portion forming a protrusion or a rib. For processing glass substrates for automobiles. 5. The blasting includes a first step of cutting a concave portion halfway while leaving a reinforcing portion using a masking resist, and a second step of removing the masking resist in the concave portion region and cutting the concave portion to a predetermined depth. The method for processing a glass substrate for encapsulating an organic EL display panel according to claim 4, further comprising: 6. The blasting includes a first step of forming a uniform recess having a shallow depth corresponding to the difference between the height of the reinforcement and the depth of the recess, and the shallow recess having a predetermined depth with the reinforcement remaining. The method of processing a glass substrate for encapsulating an organic EL display panel according to claim 4, further comprising a second step of forming even a concave portion. 7. The organic EL according to claim 5, wherein a soft masking resist material such as a rubber material cut by a blast material is used as the masking resist.
A method for processing a glass substrate for sealing a display panel.