CN1582072A - Organic light-emitting double-sided display element - Google Patents

Abstract

The invention relates to an organic light-emitting double-sided display element, which is characterized in that an electrode layer and an organic light-emitting layer are sequentially arranged on a main substrate and a secondary substrate; injecting a conductive adhesive material on the main substrate, wherein the conductive adhesive material is higher than the organic light-emitting layer, and arranging a packaging adhesive material on the side edge of the main substrate; finally, pressing the two substrates together and then packaging, and coating the circuits on the substrates with packaging glue materials to block moisture; the inner space of the main substrate and the sub-substrate is also filled with a non-transparent moisture absorption drying material, and the moisture absorption drying material can absorb moisture and isolate the mutual interference of the organic light-emitting sources from the back.

Description

Organic light-emitting double-sided display element

technical field

The invention relates to an organic light-emitting element, in particular to an organic light-emitting double-sided display element and a manufacturing method thereof.

Background technique

Organic Light-Emitting Diode (Organic Light-Emitting Diode), also known as Organic Electroluminescence (OEL), has a new generation of technology that is difficult to achieve with other flat-panel display technologies, such as bright and clear full-color images and High agile reaction speed.

The basic structure of an organic light-emitting diode display panel is a thin and transparent semiconductor indium tin oxide (ITO) as the positive electrode, which is stacked with a metal cathode to sandwich an organic material layer. The organic material layer includes holes. transport layer (HTL), light emitting layer (EL), and electron transport layer (ETL). When the battery provides an appropriate voltage (low voltage characteristics), when the holes injected into the anode and the charges of the cathode are combined in the light-emitting layer, the organic material can be excited to produce light. The structure of the organic layer and the selection of the positive and negative electrodes are designed to make The key for the organic light-emitting diode display panel device to fully exert its luminous efficacy.

Organic light-emitting diode display panels are characterized by self-illumination, no need for backlight modules, low-voltage drive (less than 10 Volts) and power saving, high energy efficiency (16lm/W), and high brightness (up to 100,000cd/m ² or more) , short response time (less than 2μs), high contrast, wide viewing angle (close to 180°), light weight, thin thickness, simple structure, low manufacturing cost, flexibility (plastic substrate) and full color.

Therefore, OLED display panels can be used in a wide range of applications, and have huge market potential in displays or lighting equipment. Such as: mobile phones, game consoles, audio panels, digital cameras, personal digital assistants (PDA), car navigation systems, e-books, information appliances, notebook computers, monitors, TVs, etc.

Among them, taking mobile phones as an example, the usage rate of mobile phones has been very popular in recent years, and the communication quality has also been continuously improved. The display screen of mobile phones has evolved from early digital display to dynamic graphic display at the current stage. Most of the display screens have changed from the original single display screen to a foldable dual display screen. At this stage, when organic light-emitting diode display panels are used as foldable dual display screens, two display panels and two sets of drive circuits must be used. , as shown in Figure 1, is a schematic structural diagram of an existing dual display screen, as shown in the figure; it mainly has upper and lower main substrates A and sub-substrates B, and two substrates A and B are respectively arranged in sequence A set of cathode circuits C, C1, two sets of anode circuits D, D1, an organic light emitter E, F, a drying material G, H, and a package glue I, J coated on the two substrates A, B, through a package The covers K and L are bonded to the encapsulation adhesives I and J to complete the encapsulation process, and finally the double-sided adhesive M is coated on the backside of the two encapsulation covers K and L, so that the main substrate A and the sub-substrate B are combined into one body. The main and sub-substrates A and B are used to emit light sources respectively, so that dual display screens can be completed; in addition, when driving the display screens, a driving circuit N and O must be respectively arranged on the main substrate A and the sub-substrate B.

The dual display screen combined by the above method needs two sets of cathode circuits C, two sets of anode circuits D, two pieces of drying materials G, H, two pieces of packaging covers K, L, a double-sided adhesive M and a driving circuit N, O, therefore, there will be problems of increased thickness, difficulty in assembly, and high cost.

Therefore, in order to reduce the above problems, a method of transparent cathode is currently proposed, as shown in Figure 2, which is a schematic structural diagram of the existing transparent cathode method, as shown in the figure; it mainly includes: an organic light-emitting diode 1, a transparent cathode 2 , an etched circuit 3 , a flexible circuit board 4 , a transparent packaging cover 5 , a transparent substrate 6 , a light-emitting direction of the primary screen 7 , a light-emitting direction of the main screen 7A, a light-shielding sheet 8 for the primary screen, and a light-shielding sheet 8A for the main screen; This method utilizes the concept of transparent electrodes, cooperates with the characteristics of organic light-emitting diodes as point light sources, and performs shielding treatment on the required light-emitting surface to achieve the effect of double-sided display.

Although the structure of the above-mentioned transparent cathode method can make the thickness thinner (only one substrate is needed) and save materials (only one substrate, one production process, one circuit board), but in fact, because the display surface belongs to the light-emitting position of one substrate , so there are constraints on each other and cannot be moved arbitrarily; and the light of the main screen and the light of the secondary screen will reflect and interfere with each other in the structure, and there will be angle problems, as shown in the direction of the black solid line 9 arrow; in addition, the transparent The light transmittance of cathode 2 must reach the same standard as that of glass in the application of some products before it can be used.

Contents of the invention

Therefore, the main purpose of the present invention is to solve the above defects. In order to avoid the existence of the defects, it provides an organic light-emitting double-sided display element, which mainly reduces the use of drying materials, packaging covers, double-sided adhesive tape and driving circuits. Therefore, the thickness and cost can be reduced, and the assembly is simple.

The secondary purpose of the present invention is to use the main substrate and the secondary substrate as packaging covers for each other, and the packaging adhesive material can complete the packaging of the two substrates in only one packaging manufacturing process, thereby reducing the packaging procedure.

Another object of the present invention is to use a non-transparent moisture-absorbing desiccant material to be arranged on the back of the organic light-emitting layer, so as to absorb moisture, isolate the mutual interference from the back light source, and prevent the mutual interference of light. The light-emitting positions of the substrate and the display surface do not overlap, so they can be moved arbitrarily.

Description of drawings

FIG. 1 is a schematic structural diagram of an existing dual display screen.

Fig. 2 is a structural schematic diagram of an existing transparent cathode method.

Fig. 3 is a schematic diagram of the fabrication of the main board circuit of the organic light-emitting double-sided display element of the present invention.

Fig. 4 is a schematic diagram of the fabrication of the sub-board circuit of the organic light-emitting double-sided display element of the present invention.

FIG. 5 is a schematic diagram (1) of manufacturing an organic light-emitting double-sided display element of the present invention.

Fig. 6 is a schematic diagram (2) of manufacturing an organic light-emitting double-sided display element of the present invention.

Detailed ways

Embodiments and technical contents of the present invention are described as follows in conjunction with the accompanying drawings:

As shown in Figures 3 and 4, it is a schematic diagram of the production of the main board and the sub-substrate circuit of the organic light-emitting double-sided display element of the present invention. As shown in the figure: it includes a main substrate 10 and a primary substrate 20. A pair of alignment marks 11, 21 are prefabricated on the substrate 20, and the commonly used data lines 12, 22, and the scanning lines 13, 23 that must be used separately are arranged to form an action area 14, 24; and the data lines 12, 22 and the ends of scanning lines 13, 23 have data line conduction points 120, 220 and scan line conduction points 130, 230;

The purpose of separating the scanning lines 13 and 23 is mainly to avoid scanning to the pixels of the sub-substrate 20 when driving the pixels (Pixels) of the main substrate 10, so as to reduce the waste of power. In addition, the data lines of the sub-substrate 20 lead The pass point 130 and the scan line conduction point 230 need to be reserved in advance during wiring. At this time, the line pitch of the sub-substrate 20 can be enlarged, thereby reducing the difficulty of wiring and increasing the conductivity.

Please refer to Figures 5 and 6, which are schematic diagrams (1) and (2) of the fabrication of the organic light-emitting double-sided display element of the present invention, as shown in the figure: mainly on the main substrate 10 and the sub-substrate 20 in sequence An electrode layer 15, 25, an organic light-emitting layer 16, 26 and a cathode layer 19, 29 are arranged, and a conductive adhesive material 17 (such as "silver conductive adhesive") is injected on the main substrate 10, and the conductive adhesive material 17 higher than the organic light-emitting layers 16 and 26, and secondly, an encapsulating adhesive 18 is provided on the side of the main substrate 10 by coating or screen printing; finally, the pre-made alignment marks of the main substrate 10 and the sub-substrate 20 are used 11, 21, the two substrates 10, 20 are pressed together and packaged (the packaging method can be UV curing or thermal curing).

When the two substrates 10 and 20 are combined into one body, a drive circuit 40 is provided on the electrode layer 15 of one of the substrates (such as the main substrate 10), and the main substrate 10 and the sub-substrate 20 are connected through the conductive adhesive material 17. A single driving circuit board 40 can drive the display of the two substrates 10, 20;

It is worth mentioning that the present invention coats a non-transparent moisture-absorbing desiccant material 30 in the space between the two substrates 10, 20, through which the moisture-absorbed desiccant material 30 can absorb moisture and isolate the organic light-emitting source from the back side. Interference, used as insulation: use the encapsulant 18 to cover the circuits on the substrates 10 and 20 to block moisture.

The organic light-emitting double-sided display element of the present invention is composed of the above-mentioned components. Compared with the existing double-display screen structure in FIG. Two sets of drive circuits N and O are used for display, and two pieces of drying material G, H, two pieces of packaging cover K, L (secondary packaging production process), and a double-sided adhesive M are required, so the thickness is increased, assembly is difficult, And the problem of high cost;

And the present invention does not need double-sided tape M, desiccant material G, H and encapsulating lid K, L, can make thickness thinner and reduce cost, the most important is because the present invention utilizes this main substrate 10 and sub-substrate 20 are formed as packaging covers for each other. Through the packaging glue 18, the packaging of the two substrates can be completed in only one packaging manufacturing process, reducing the packaging procedure.

Furthermore, compared with the structure of the existing transparent cathode method in Fig. 2, the present invention also has a more practical and progressive effect, although the structure of the above-mentioned transparent cathode method can make the thickness thinner and save materials, but because the display surface The light-emitting positions belong to the same substrate, so they are bound to each other and cannot be moved arbitrarily; and the light of the main screen and the light of the secondary screen will reflect and interfere with each other in the structure, and there will be angle problems;

However, the present invention utilizes a non-transparent moisture-absorbing desiccant material 30 to be disposed on the back of the organic light-emitting layer 16, 26 by vapor deposition or coating, so as to absorb moisture and isolate the mutual interference from the back light source, so there will be no mutual interference of light. The problem of interference; and the present invention uses two substrates (the main substrate 10 and the sub-substrate 20 ), the light-emitting positions of the display surface will not overlap, so they can be moved arbitrarily.

Obviously, those skilled in the art can make various modifications and changes to the present invention without departing from the spirit and scope of the present invention. Therefore, various modifications and changes of the present invention are covered by the appended claims and their equivalents.

Claims (6)

1. organic light emission double-sided display element, it comprises a main substrate (10) and time substrate (20), wherein on described main substrate (10) and described substrate (20), an electrode layer (15), (25) are set in regular turn respectively, an organic luminous layer (16), (26) and a cathode layer (19), (29);

It is characterized in that: go up to inject a conducting resinl material (17) at described main substrate (10), and described conducting resinl material (17) is higher than described organic luminous layer (16) (26), and a packaging adhesive material (18) is set on the side of described main substrate (10); Finish encapsulating after the two plate base pressings at last, and utilize described packaging adhesive material (18) that the circuit on the described substrate is coated wherein, to intercept aqueous vapor;

And, fill a nontransparent hygroscopic desiccation material (30) in the inner space that described main substrate (10) combines with described substrate (20), can absorb moisture by described hygroscopic desiccation material (30), and completely cut off phase mutual interference from the organic light emission source at the back side.

2. organic light emission double-sided display element according to claim 1, it is characterized in that, on the described electrode layer (15) of described main substrate (10) one drive circuit (40) is set, and utilize described main substrate of described conducting resinl material (17) conducting (10) and described substrate (20), drive described main substrate (10) by described single drive circuit (40) and show with described substrate (20).

3. organic light emission double-sided display element according to claim 1 is characterized in that, utilizes silver conductive adhesive material (17) to make described main substrate (10) and described substrate (20) form conducting on the described main substrate (10).

4. organic light emission double-sided display element according to claim 1 is characterized in that, described main substrate (10) and described substrate (20) cap formation each other.

5. organic light emission double-sided display element according to claim 1 is characterized in that described packaging adhesive material (18) is arranged on the described main substrate (10) in the wire mark mode.

6. organic light emission double-sided display element according to claim 1 is characterized in that described packaging adhesive material (18) is arranged on the described main substrate (10) with coating method.

Images