KR20070065098A - Oled display panel - Google Patents

Abstract

An OLED(Organic Light Emitting Diode) display panel is provided to remove moisture and oxygen in the panel by forming an additional light emitting organic layer in an area except an active area and an area where a scan line and a data line pass. An OLED display panel includes a substrate(200). A bottom electrode pattern is formed on the substrate(200). An insulator defines a pixel area by exposing some area of the bottom electrode pattern on the substrate(200). A reverse-taper shaped separator is formed on the insulator between the pixel areas. A lengthwise direction of the reverse-taper shaped separator is perpendicular to the bottom electrode pattern. A light emitting organic layer is formed on the exposed transparent electrode pattern of the pixel area. An upper electrode is formed on the light emitting organic layer. A data line(120) electrically connects a bottom electrode to an external circuit on the substrate(200) to apply a predetermined electrical signal to the bottom electrode. A scan line(110) electrically connects the upper electrode to the external circuit on the substrate(200) to apply the electrical signal to the upper electrode. An excess organic layer(130) removes moisture and oxygen inside the panel except for an area where the structures are formed on the substrate(200).

Description

OLED display panel {OLED display panel}

1 is a plan view illustrating an LED display panel according to an exemplary embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of the active region of FIG. 1.

<Explanation of symbols for the main parts of the drawings>

105: active area 110: scan line

120: data line 130: surplus organic layer

200: substrate 210: lower electrode pattern

220: insulator 230: separator

240: light emitting organic layer 250: upper electrode

The present invention relates to an LED display panel, and more particularly, to an LED display panel including a means for effectively removing moisture and oxygen remaining inside the panel.

OLED stands for Organic Light Emitting Diode, and refers to a self-luminous display that emits light by electrically exciting a luminescent organic compound.

OLED can be operated at low voltage and eliminates the drawbacks of LCDs such as thinning, wide viewing angles, and fast response speeds.It is equivalent to or better than TFT-LCD in medium size and lower than other display devices. It is attracting attention as a next-generation display that has advantages such as being able to have a simple manufacturing process and advantageous in future price competition.

The OLED is formed of an organic luminescent material in a space between a lower plate having a form in which an ITO transparent electrode pattern is formed as a positive electrode on a transparent glass substrate and an upper plate in which a metal electrode is formed as a negative electrode on the substrate. And a display device that emits light while a current flows through the organic light emitting material when a predetermined voltage is applied between the metal electrode and the metal electrode.

In the OLED display panel, the organic light emitting material layer formed by the organic light emitting material is very reactive to moisture and oxygen. When the organic light emitting material comes into contact with moisture and oxygen, the organic light emitting material is degraded to form an overall LED display panel. It may lead to poor.

Therefore, after fabricating the pixel area of the LED display panel, the light emitting organic layer and the upper electrode exposed through a passivation process are covered, and an encapsulation with a desiccant attached to the rear is finally applied. The final seal will be installed.

In performing such a process, an aging process must be performed before the OLED display panel is commercialized. The aging process is a harsh condition for the entire panel and a voltage corresponding to a harsh condition in the pixel area of the ODL display panel. In order to remove the progressive defects by applying the corresponding heat and to stabilize the entire device.

In the aging process, the heat is applied to the light emitting organic layer of the OLED display panel without absorbing moisture and oxygen in a normal state, and when a voltage is applied to the upper electrode and the lower electrode to generate light, that is, when heat is generated. The light emitting organic layer is oxidized by absorbing moisture and oxygen.

As a result of the operation of the device, before the oxidation of the light emitting organic layer due to the heat generation of the light emitting organic material layer, the corresponding heat is applied in an aging process in advance to remove moisture and oxygen before the device operation. It reduces the deterioration and failure of the OID display panel that may occur during operation.

However, when the aging process is performed, heat of relatively high voltage and high temperature is applied to the LED display panel, which may be advantageous in absorbing moisture and oxygen, but other components of the LED display panel may be advantageous. This may have a bad effect. A representative example is a phenomenon in which an upper electrode made of metal is oxidized when heated.

Therefore, in manufacturing an OLED display panel, it is necessary to develop a new technology that can easily remove moisture and oxygen present in the panel even if a relatively high temperature is not applied after the device is manufactured.

The technical problem to be achieved in the present invention is to manufacture an OLED display panel, even without applying a high temperature heat to remove the moisture and oxygen present in the panel OLED display panel that can easily remove the moisture and oxygen inside the panel In providing.

Technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

An OLED display panel according to an embodiment of the present invention for solving the above technical problem is a pixel by exposing a portion of the lower electrode pattern on the substrate, the lower electrode pattern formed on the substrate, the lower electrode pattern formed on the substrate An insulator formed to define a region, an inverted tapered separator formed in a longitudinal direction perpendicular to the lower electrode pattern on the insulator between the pixel regions, a light emitting organic layer formed on the exposed transparent electrode pattern of the pixel region, and a light emitting organic layer An upper electrode formed on the substrate; a data line formed to electrically connect the lower electrode to an external circuit on the substrate to apply a predetermined electrical signal to the lower electrode; and an upper electrode electrically connected to the external circuit on the substrate. Scan lines formed to apply predetermined electrical signals to the electrodes, and structures on the substrate The region other than the region that is present inside the panel include an organic material layer is formed in order to remove excess of moisture and oxygen.

In addition, the plurality of electrode layers extending from the scan line and the data line to apply a predetermined voltage to the surplus organic layer.

Specific details of other embodiments are included in the detailed description and the accompanying drawings.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, only the present embodiments to make the disclosure of the present invention complete, and common knowledge in the art to which the present invention pertains. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

In addition, the size of the components constituting the invention in the drawings are exaggerated for clarity of the specification, when any component is described as "exists inside, or is installed in connection with" other components, any of the above configuration An element may be installed in contact with the other component, or may be installed at a predetermined distance from the other component, and when installed at a distance, a third element for fixing or connecting the component to the other component The description of the means of may be omitted.

FIG. 1 is a plan view illustrating an LED display panel according to an exemplary embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of the active region 105 of FIG. 1.

As shown in FIG. 1, in the LED display panel according to the exemplary embodiment of the present invention, an active region 105 that emits light is actually formed on a substrate 200, and the active region 105 is connected to an external circuit. Scan line 110 and data line 120 to apply an electrical signal to the active region 105, and a surplus organic layer 130 formed separately from the active region 105 in a predetermined region on the substrate 200. Include.

Referring to FIG. 2, the active region 105 will be described in more detail. As shown in FIG. 2, the active region 105 actually emits light and displays information on the LED element. , An insulator 220, a separator 230, a light emitting organic layer 240, and an upper electrode 250.

The substrate 200 serves as a base layer of the OLED display panel 20 of the present invention. In the case of a bottom emission type and a dual emission OLED display panel, the substrate 200 is made of glass. Transparent substrates are used, and in the case of top emission, silicon substrates are used.

The lower electrode pattern 210 is an anode that is used as an anode and is formed with a stripe pattern on the substrate 200. The lower electrode pattern 210 is electrically connected to a data line (see 120 in FIG. 1) to form an external circuit. The electrical signal is applied.

The lower electrode pattern 210 is formed of a transparent material such as indium tin oxide (ITO) in the case of the bottom emission type and the bidirectional emission type, but is formed using a metal material in the case of the top emission type.

The insulator 220 is formed conformally on the substrate 200 on which the lower electrode pattern 210 is formed, but is formed in a partial region of the lower electrode pattern 210 where a pixel area is to be defined. Not. That is, the lower electrode pattern 210 is exposed between the insulators 220 formed in the region where the pixel region is to be defined.

The insulator 220 is generally formed through an exposure and development process using a photoresist.

Separator 230 is formed on the insulator 220 between the pixel regions so that the longitudinal direction is perpendicular to the lower electrode pattern 210, the shape is inverted tapered (cross-sectional shape of the reverse diamond) have.

The reason why the shape of the separator 230 is reverse tapered is to electrically separate the upper electrode 250 to be formed later over each pixel region.

The light emitting organic layer 240 is formed on the exposed lower electrode pattern (the pixel region) between the insulators 220, and although not shown in detail in FIG. Corresponding luminescent organic layers are formed adjacent to each other, and the three cells are gathered to form one pixel.

The upper electrode 250 is an electrode used as a cathode, and is formed on the light emitting organic layer 240. In the case of the lower light emitting type, the upper electrode 250 is formed using a metal material having good electrical conductivity such as Al, Cr, Ag, and Ni. In the case of a light emitting type, it is formed using a transparent material such as ITO.

The upper electrode 250 is electrically connected to the scan line (see 110 in FIG. 1) to receive an electrical signal from an external circuit.

Referring back to FIG. 1, the active region 105 includes a data line 120 electrically connecting a lower electrode pattern (see 210 in FIG. 2) of the active region 105 to an external circuit to apply a predetermined electrical signal. A scan line 110 that electrically connects the upper electrode (see 250 in FIG. 2) of the active region 105 to an external circuit to apply a predetermined electrical signal is formed on the substrate 200 outside the active region 105. Formed.

Also, a portion of the substrate 200 in which the active region 105, the scan line 110, and the data line 120 are not formed is a light emitting layer in the active region 105 in a predetermined region (upper right part in FIG. 1). In addition to the formed organic material layer (see 240 of FIG. 2), a separate organic material layer is formed, which is defined as a surplus organic layer 130.

The surplus organic layer 130 is formed of a luminescent organic layer used for the luminescent organic layer (see 240 in FIG. 2) of the active region 105 and is formed to absorb moisture and oxygen inside the panel.

However, since the light emitting organic material has more excellent absorption power of moisture and oxygen when heat is generated in the process of emitting light by applying a constant voltage rather than itself, the surplus organic layer 130 is provided with an additional electrode to provide an active region 105. It is desirable to allow) to emit light together during operation.

Therefore, the electrode layers 131 and 132 extending from the scan line 110 and the data line 120 to the surplus organic layer 130 to be applied to the surplus organic layer 130 should be formed separately.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above embodiments but may be manufactured in various forms, and having ordinary skill in the art to which the present invention pertains. It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

According to the OLED display panel according to an embodiment of the present invention, by forming a separate light emitting organic layer in a region other than the active region and the region where the scan line and the data line pass on the substrate of the general LED display panel, a high temperature in the aging process Even without the harsh conditions, it is very easy to remove the excess moisture and oxygen present inside the panel.

Claims (2)

Board; A lower electrode pattern formed on the substrate; An insulator formed to define a pixel region by exposing a partial region of the lower electrode pattern on the substrate on which the lower electrode pattern is formed; An inverse tapered separator formed on the insulator between the pixel regions such that a longitudinal direction is perpendicular to the lower electrode pattern; A light emitting organic layer formed on the transparent electrode pattern exposed in the pixel region; An upper electrode formed on the light emitting organic layer; A data line formed on the substrate to electrically connect the lower electrode to an external circuit to apply a predetermined electrical signal to the lower electrode; A scan line formed on the substrate to electrically connect the upper electrode to an external circuit to apply a predetermined electrical signal to the upper electrode; And And an excess organic layer formed to remove moisture and oxygen present in the panel in a region other than a region in which the structures on the substrate are formed. The method of claim 1, The surplus organic layer is electrically connected to a first electrode extending from the scan line and a second electrode extending from the data line to emit light when a predetermined voltage is applied to the scan line and the data line. OLED display panel, characterized in that activated simultaneously with the organic layer.

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