CN206610831U - Organic Light Emitting Diode Display Device - Google Patents

Abstract

An organic light emitting diode display device comprises a lower substrate, an insulating layer, a lower electrode, an organic layer, an upper electrode, an upper substrate and an optical barrier layer. The insulating layer is arranged on the lower substrate. The lower electrode is arranged on the insulating layer, wherein the material of the lower electrode is transparent conductive material or semitransparent conductive material. The organic layer is disposed on the lower electrode. The upper electrode is arranged on the organic layer, wherein the material of the upper electrode is transparent conductive material or semitransparent conductive material. The upper substrate is disposed on the upper electrode and corresponds to the lower substrate to serve as a package structure. The optical barrier layer is arranged on one side of the upper electrode far away from the organic layer. By making the lower electrode and the upper electrode transparent or semitransparent, external light can pass through the lower electrode and the upper electrode and then be absorbed by the optical barrier layer, so that the organic light-emitting diode display device can avoid the influence of external light reflection on picture quality, and the contrast of the organic light-emitting diode display device is improved.

Description

Organic Light Emitting Diode Display Device

technical field

The utility model relates to an organic light emitting diode display device.

Background technique

Organic Light Emitting Diode (OLED) display devices are light-emitting elements using luminescent organic compounds, which have self-luminous properties, and are superior to Liquid Crystal Displays (Liquid Crystal Display, LCD). Due to the wide viewing angle, high response speed, and ultra-thin characteristics of the OLED display device, the application range of the OLED display device is becoming wider and wider.

Organic light emitting diode display devices are considered to be the mainstream technology of the next generation. In a traditional organic light emitting diode display device, in order to improve light extraction efficiency, a material with high reflectivity is used as the lower driving electrode of the organic light emitting diode, so that the light emitted downward can be reflected by the lower driving electrode and go upward, thereby obtaining a higher Light efficiency. Furthermore, there is also a technology that uses a micro-optical resonant cavity for an organic light-emitting diode display device. In this technology, in addition to the high-reflectivity materials that must be used for the lower driving electrode of the organic light-emitting diode, the upper driving electrode must also have certain properties. Reflectivity, this type of display device can provide better color saturation and higher brightness at the front viewing angle.

In the above technologies, although better light extraction efficiency can be obtained, some problems are also caused. For example, because the organic light emitting diode display device is self-illuminating, it will have display characteristics of high contrast and high color saturation indoors or under low ambient light conditions. However, if the user is under a high-intensity ambient light source, because the brightness of the organic light-emitting diode itself will be lower than the external ambient light, and the driving electrode with high reflectivity will reflect the incident light from the outside, when the user is in high-brightness Under the ambient light source (for example, outdoor sunlight), the light reflected from the outside through the display device will seriously affect the original display screen of the display device, reducing the image quality, so that the user cannot clearly see the screen displayed on the display device.

To solve the above-mentioned problems, currently known organic light-emitting diode display devices usually have optical anti-reflection structures (such as polarizers and optical compensation films) mounted outside the substrate on the light-emitting surface. Under this structure, although the external light will be completely absorbed by the optical anti-reflection structure to prevent the external light from affecting the picture quality of the display device, but at the same time, the internal light emitted by the display device will also pass through the optical anti-reflection structure, thus making the The luminous efficiency of the display device is greatly reduced. In addition, an additional optical anti-reflection structure will also increase the thickness and weight of the overall device.

In addition, as mentioned above, in order to increase light extraction efficiency, the existing organic light emitting diode display devices use electrode materials with high reflectivity as the driving electrodes. However, electrodes with high reflectivity often have high reactivity, and are easily affected by external moisture and oxygen, thereby reducing the service life of the OLED. Therefore, the existing organic light-emitting diode display devices also need a strict packaging process to prevent external moisture and oxygen from entering. At present, glass substrates are most commonly used as the upper and lower substrates of OLEDs, and the glass substrates are used to reduce the penetration rate of water vapor and oxygen to ensure the life and quality of OLED elements. However, if the overall weight, thickness, and even future flexible applications are considered, it is inevitable to use plastic substrates, but the use of plastic substrates will reduce the ability to block moisture and oxygen penetration, thereby reducing The lifespan and quality of organic light-emitting diodes.

Utility model content

A technical aspect of the present invention is to provide an organic light-emitting diode display device, which can not only improve its light-dark contrast and overall brightness, but also improve its reliability, and is more suitable for flexible applications.

According to an embodiment of the present invention, an OLED display device includes a lower substrate, an insulating layer, a lower electrode, an organic layer, an upper electrode, an upper substrate, and an optical barrier layer. The insulating layer is disposed on the lower substrate. The lower electrode is arranged on the insulating layer, wherein the lower electrode is a transparent conductive electrode or a translucent conductive electrode. The organic layer is disposed on the lower electrode. The upper electrode is arranged on the organic layer, wherein the upper electrode is a transparent conductive electrode or a translucent conductive electrode. The upper substrate is disposed on the upper electrode and corresponds to the lower substrate as a packaging structure. The optical blocking layer is disposed on the side of the upper electrode away from the organic layer.

In one or more embodiments of the present invention, the optical barrier layer is made of non-metallic material.

In one or more embodiments of the present invention, the material of the optical blocking layer is an organic material or an inorganic material.

In one or more embodiments of the present invention, the material of the optical barrier layer is graphite or carbon compound.

In one or more embodiments of the present invention, the optical blocking layer is disposed between the upper electrode and the upper substrate.

In one or more embodiments of the present invention, the optical barrier layer is disposed on the upper substrate.

In one or more embodiments of the present invention, the OLED display device further includes a color filter layer. The color filter layer is disposed between the lower substrate and the insulating layer, wherein the color of the color filter layer corresponds to the color of light emitted by the organic layer.

In one or more embodiments of the present invention, there are multiple organic layers. The OLED display device further includes a pixel definition layer and a plurality of thin film transistors. The pixel definition layer is disposed between the organic layers and is used to define each pixel. A plurality of thin film transistors are disposed between the lower substrate and the pixel definition layer, wherein each thin film transistor corresponds to each organic layer.

According to another embodiment of the present invention, an OLED display device includes a lower substrate, an insulating layer, a lower electrode, an organic layer, an upper electrode, and an optical barrier layer. The insulating layer is disposed on the lower substrate. The lower electrode is arranged on the insulating layer, wherein the lower electrode is a transparent conductive electrode or a translucent conductive electrode. The organic layer is disposed on the lower electrode. The upper electrode is arranged on the organic layer, wherein the upper electrode is a transparent conductive electrode or a translucent conductive electrode. The optical blocking layer is disposed on the upper electrode and corresponds to the lower substrate as a packaging structure.

In one or more embodiments of the present invention, the OLED display device further includes: a color filter layer disposed between the lower substrate and the insulating layer, wherein the color of the color filter layer Corresponds to the color of the light emitted by the organic layer.

In one or more embodiments of the present utility model, the number of the organic layers is multiple; and the organic light emitting diode display device further includes: a pixel definition layer, arranged between the organic layers, for to define each pixel; and a plurality of thin film transistors disposed between the lower substrate and the pixel definition layer, wherein each of the thin film transistors corresponds to each of the organic layers.

In the above embodiments of the present invention, the lower electrode and the upper electrode are both transparent or translucent, so that the external light generated from the external environment will pass through the lower electrode and the upper electrode, and then be absorbed by the optical barrier layer. In addition, half of the light generated from the organic layer will travel upwards and pass through the upper electrode, and then be absorbed by the optical blocking layer, and the other half will travel downwards and pass through the lower electrode, and then exit the OLED display device. Therefore, the organic light-emitting diode display device can avoid external light reflection from affecting the picture quality, and improve the light-dark contrast of the organic light-emitting diode display device. In addition, because the present invention does not require any optical anti-reflection structure externally installed on the outside of the organic light-emitting diode display device, therefore The self-luminous efficiency of the organic light emitting diode display device will not be affected, and the thickness and weight of the product can be simplified and the cost of design and production can be reduced. Furthermore, the designed optical barrier layer further has the function of blocking the penetration of water and oxygen, thereby improving the service life and quality of the organic light emitting diode element.

Description of drawings

1 shows a schematic cross-sectional view of an organic light emitting diode display device according to an embodiment of the present invention;

2 shows a schematic cross-sectional view of an organic light emitting diode display device according to another embodiment of the present invention;

3 shows a schematic cross-sectional view of an organic light emitting diode display device according to yet another embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of an OLED display device according to still another embodiment of the present invention.

detailed description

A number of implementations of the present invention will be disclosed below with the accompanying drawings. For the sake of clarity, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the invention. That is to say, in some embodiments of the present utility model, these practical details are unnecessary. In addition, for the sake of simplifying the drawings, some known and conventional structures and elements will be shown in a simple and schematic manner in the drawings.

FIG. 1 is a schematic cross-sectional view of an OLED display device 100 according to an embodiment of the present invention. Different embodiments of the present invention provide an OLED display device 100 . Specifically, the OLED display device 100 is a bottom-emitting OLED display device.

As shown in FIG. 1 , the OLED display device 100 includes a lower substrate 110 , an insulating layer 120 , a lower electrode 130 , an organic layer 140 , an upper electrode 150 , an upper substrate 160 and an optical blocking layer 170 . The insulating layer 120 is disposed on the lower substrate 110 . The lower electrode 130 is disposed on the insulating layer 120 , wherein the material of the lower electrode 130 is a transparent conductive material or a translucent conductive material. The organic layer 140 is disposed on the lower electrode 130 . The upper electrode 150 is disposed on the organic layer 140 , wherein the material of the upper electrode 150 is a transparent conductive material or a translucent conductive material. The upper substrate 160 is disposed on the upper electrode 150 and provides a packaging structure corresponding to the lower substrate 110 . The optical blocking layer 170 is disposed on a side of the upper electrode 150 away from the organic layer 140 . Specifically, the optical blocking layer 170 is disposed between the upper electrode 150 and the upper substrate 160 . In this embodiment, the insulating layer 120 , the lower electrode 130 , the organic layer 140 , the upper electrode 150 and the optical blocking layer 170 are packaged in the package structure formed by the upper substrate 160 and the lower substrate 110 .

Since the lower electrode 130 and the upper electrode 150 are both transparent or translucent, the external light L1 generated from the external environment will pass through the lower electrode 130 and the upper electrode 150 and then be absorbed by the optical blocking layer 170 . In addition, half of the light generated from the organic layer 140 will travel upwards and pass through the upper electrode 150, and then be absorbed by the optical blocking layer 170 (ie light L3), and the other half will travel downwards and pass through the lower electrode 130, and then The organic light emitting diode display device 100 (that is, light L2 ) is emitted. Therefore, the OLED display device 100 can not only avoid the reflection of the external light L1 from affecting the image quality, but also improve the light-dark contrast of the OLED display device 100, and about half of the light generated by the organic layer 140 can exit the OLED display device 100. , so that the overall brightness can be effectively improved.

In addition, compared with other organic light emitting diode display devices, the organic light emitting diode display device 100 does not need to install other additional devices to avoid the reflection of external light L1 and affect the picture quality, so the thickness of the organic light emitting diode display device 100 can be thinner, The weight can also be lighter.

Specifically, the material of the optical blocking layer 170 is a non-metallic material. More specifically, the material of the optical blocking layer 170 can be organic or inorganic. If the material of the optical blocking layer 170 is an organic material, the material of the optical blocking layer 170 can be an organic small molecule material or an organic polymer material. If the material of the optical blocking layer 170 is an inorganic material, the material of the optical blocking layer 170 may be graphite or other carbon compound materials. It should be understood that the material of the optical barrier layer 170 mentioned above is only an example, and is not intended to limit the present invention. Those with ordinary knowledge in the technical field of the present invention should flexibly select the material of the optical barrier layer 170 according to actual needs. material.

Specifically, the lower substrate 110 and the upper substrate 160 are transparent. More specifically, the material of the lower substrate 110 and the upper substrate 160 can be glass or plastic. Plastics can include polyimide (PI), polypropylene (PP), polystyrene (PS), acrylonitrile-butadiene-styrene (ABS), polyethylene terephthalate (PET), poly Vinyl chloride (PVC), polycarbonate (PC), polyethylene (PE), polymethyl methacrylate (PMMA), polytetrafluoroethylene (PTFE), etc. It should be understood that the materials of the lower substrate 110 and the upper substrate 160 mentioned above are only examples, and are not intended to limit the present utility model. Those with ordinary knowledge in the technical field of the present utility model should flexibly select the lower substrate according to actual needs. 110 and the material of the upper substrate 160.

Specifically, the upper electrode 150 and the lower electrode 130 are made of materials with low activity and both optically low reflectivity and high transmittance, such as indium tin oxide (ITO). But it is not limited thereto. In other embodiments, the material of the upper electrode 150 and the lower electrode 130 can be indium zinc oxide (IZO), aluminum zinc oxide (AZO), aluminum indium oxide (AIO), indium oxide (InO), Gallium oxide (GaO), carbon nanotubes or silver nanoparticles.

Specifically, the insulating layer 120 is transparent or translucent. It should be understood that the specific implementation of the insulating layer 120 mentioned above is only an example, and is not intended to limit the present utility model. Those with ordinary knowledge in the technical field of the present utility model should flexibly select the insulating layer 120 according to actual needs. detailed description.

Specifically, the organic layer 140 includes a hole injection layer 141 , a hole transport layer 142 , a light emitting layer 143 , a hole blocking layer 144 and an electron transport layer 145 . The hole injection layer 141 is disposed on the bottom electrode 130 . The hole transport layer 142 is disposed on the hole injection layer 141 . The light emitting layer 143 is disposed on the hole transport layer 142 . The hole blocking layer 144 is disposed on the light emitting layer 143 . The electron transport layer 145 is disposed on the hole blocking layer 144 .

Specifically, the hole injection layer 141 injects holes into the hole transport layer 142, and then the hole transport layer 142 transports the holes to the light-emitting layer 143, and because of the blocking of the hole blocking layer 144, the holes will be localized in the light emitting layer 143. The electron transport layer 145 transports the electrons in the upper electrode 150 to the hole blocking layer 144, and then the electrons move to the light-emitting layer 143, so the electrons and holes will combine in the light-emitting layer 143, so the light-emitting layer 143 generates light L2, L3.

It should be noted that the design of the internal stacked structure of the organic layer 140 in this embodiment is only an example, and the specific structure can be adjusted or changed according to actual design requirements, which is not limited by the present invention.

Specifically, there are multiple organic layers 140 , and each organic layer 140 can emit light of a different color, for example, red, blue or green. The OLED display device 100 further includes a pixel definition layer 180 , a plurality of thin film transistors 190 and a plurality of data lines 192 . The pixel definition layer 180 is disposed between the organic layers 140 to define each pixel. A plurality of thin film transistors 190 are disposed between the lower substrate 110 and the pixel definition layer 180 , wherein each thin film transistor 190 corresponds to each organic layer 140 . The respective data lines 192 respectively correspond to the organic layers 140 disposed in the same row. More specifically, the thin film transistor 190 is electrically connected to the organic layer 140 and the data line 192 respectively.

It is supplemented that, in one or more embodiments of the present invention, the idea of using highly active electrodes is discarded, and materials with low activity and both optical low reflectivity and high transmittance are used as the upper electrode 150 and the upper electrode 150. The lower electrode 130 and the optical barrier layer 170 are provided to avoid the use of an external optical anti-reflection structure, so that the overall luminous efficiency can be increased by about 25% compared with the traditional display using an external optical anti-reflection structure. In addition, the optical barrier layer 170 can also provide the function of blocking the penetration of water and oxygen. When considering the overall weight and thickness of the light-emitting diode display device 100, and even future flexible applications, the optical barrier layer 170 can make up for the use of plastic substrates. The resulting problem of poor sealing effect is to improve the ability to block the penetration of water and oxygen, thereby increasing the lifespan of the light emitting diode display device 100 .

In other embodiments of the present invention, the optical blocking layer 170 can further be a single-layer dense organic material or inorganic material structure, or a multi-layer structure in which organic materials and inorganic materials are interlaced. The specific effect can be to isolate water vapor and oxygen from the outside, or to absorb water vapor and oxygen, or to have the function of isolating and absorbing water and oxygen at the same time, so as to prevent water vapor and oxygen from penetrating into the LED display device 100 internal role.

Based on the above, the light-emitting diode display device 100 provided in this embodiment does not need to use an external optical anti-reflection structure, so the self-luminous efficiency of the organic light-emitting diode display device 100 will not be affected, and the product thickness can be simplified and the product can be lightened. Weight, reduce design and production costs. Moreover, the designed optical blocking layer 170 further has the function of blocking the penetration of water and oxygen, thereby improving the service life and quality of the internal components of the OLED display device 100 .

FIG. 2 is a schematic cross-sectional view of an OLED display device 100 according to another embodiment of the present invention. As shown in FIG. 2 , the organic light emitting diode display device 100 of this embodiment is substantially the same as the organic light emitting diode display device 100 of the previous embodiment, the main difference lies in the optical barrier layer 170 of the organic light emitting diode display device 100 of this embodiment disposed on the upper substrate 160 .

FIG. 3 is a schematic cross-sectional view of an OLED display device 100 according to yet another embodiment of the present invention. As shown in FIG. 3 , the organic light emitting diode display device 100 of this embodiment is substantially the same as the organic light emitting diode display device 100 of the previous embodiment, the main difference is that the organic light emitting diode display device 100 of this embodiment has no upper substrate, and The optical blocking layer 170 is disposed on the upper electrode 150 . In other words, the optical barrier layer 170 also serves as the upper substrate, and corresponds to the lower substrate 110 as a packaging structure. For this, in this embodiment, the insulating layer 120 , the lower electrode 130 , the organic layer 140 and the upper electrode 150 are packaged in the package structure formed by the optical blocking layer 170 and the lower substrate 110 .

FIG. 4 is a schematic cross-sectional view of an OLED display device 100 according to still another embodiment of the present invention. The organic light emitting diode display device 100 of this embodiment is substantially the same as the organic light emitting diode display device 100 of FIG. 1 , and the difference will be mainly described below.

As shown in FIG. 4 , the OLED display device 100 further includes a color filter layer 194 . The color filter layer 194 is disposed between the lower substrate 110 and the insulating layer 120 , wherein the color of the color filter layer 194 corresponds to the color of light emitted by the organic layer 140 (specifically, the light emitting layer 143 ).

For example, the color of the light emitted by the organic layer 140 is red, and the color of the color filter layer 194 is red, so the light L2 emitted by the organic layer 140 can pass through the color filter layer 194 without being affected. However, for the external light L1 generated from the external environment, when passing through the color filter layer 194, only its red part can pass through the color filter layer 194, and the other part is absorbed by the color filter layer 194, and then its red color Part of it is absorbed by the optical blocking layer 170 again. Because the external light L1 is absorbed by the color filter layer 194 and the optical blocking layer 170 respectively, the probability of the external light L1 being reflected and affecting the picture quality can be further reduced.

In the above embodiments of the present invention, the lower electrode 130 and the upper electrode 150 are made transparent or translucent, so the external light L1 generated from the external environment will pass through the lower electrode 130 and the upper electrode 150, and then be blocked by the optical blocking layer 170 absorb. In addition, half of the light generated from the organic layer 140 will travel upwards and pass through the upper electrode 150, and then be absorbed by the optical blocking layer 170 (ie light L3), and the other half will travel downwards and pass through the lower electrode 130, and then The organic light emitting diode display device 100 (that is, light L2 ) is emitted. Therefore, the organic light emitting diode display device 100 can avoid the reflection of the external light L1 from affecting the image quality, and improve the light-dark contrast of the organic light emitting diode display device 100 . In addition, since the present invention does not require any external optical anti-reflection structure outside the organic light emitting diode display device, it will not affect the self-luminous efficiency of the organic light emitting diode display device, and can simplify the product thickness and reduce product weight, reduce design and Cost of production. Furthermore, the designed optical barrier layer further has the function of blocking the penetration of water and oxygen, thereby improving the service life and quality of the organic light emitting diode element.

Although the present utility model has been disclosed as above in terms of implementation, it is not intended to limit the present utility model. Anyone familiar with the art can make various changes and modifications without departing from the spirit and scope of the present utility model. Therefore, the scope of protection of the present utility model should be as defined by the appended claims.

Claims (8)

1. a kind of organic LED display device, it is characterised in that include：

One infrabasal plate；

One insulating barrier, is arranged on the infrabasal plate；

One bottom electrode, is arranged on the insulating barrier, and wherein the bottom electrode is transparent conductive electrode or translucent conductive electrode；

One organic layer, is arranged on the bottom electrode；

One Top electrode, is arranged on the organic layer, and wherein the Top electrode is transparent or semitransparent；

One upper substrate, is arranged in the Top electrode, and to should infrabasal plate be used as an encapsulating structure；And

One optics barrier layer, is arranged at side of the Top electrode away from the organic layer.

2. organic LED display device according to claim 1, it is characterised in that the optics barrier layer is arranged at Between the Top electrode and the upper substrate.

3. organic LED display device according to claim 1, it is characterised in that the optics barrier layer is arranged at On the upper substrate.

4. organic LED display device according to claim 1, it is characterised in that also include：

One chromatic filter layer, is arranged between the infrabasal plate and the insulating barrier, and wherein the color of the chromatic filter layer, which corresponds to, is somebody's turn to do The color for the light that organic layer is launched.

5. organic LED display device according to claim 1, it is characterised in that the quantity of the organic layer is It is multiple；And

Also include：

One pixel defining layer, is arranged between the organic layer, to define each pixel；And

Multiple thin film transistor (TFT)s, are arranged between the infrabasal plate and the pixel defining layer, wherein each thin film transistor (TFT) point Dui Yingyu not each organic layer.

6. a kind of organic LED display device, it is characterised in that include：

One infrabasal plate；

One insulating barrier, is arranged on the infrabasal plate；

One bottom electrode, is arranged on the insulating barrier, and wherein the bottom electrode is transparent or semitransparent；

One organic layer, is arranged on the bottom electrode；

One Top electrode, is arranged on the organic layer, and wherein the Top electrode is transparent conductive electrode or translucent conductive electrode；And

One optics barrier layer, is arranged in the Top electrode, and to should infrabasal plate be used as an encapsulating structure.

7. organic LED display device according to claim 6, it is characterised in that also include：

One chromatic filter layer, is arranged between the infrabasal plate and the insulating barrier, and wherein the color of the chromatic filter layer, which corresponds to, is somebody's turn to do The color for the light that organic layer is launched.

8. organic LED display device according to claim 6, it is characterised in that the quantity of the organic layer is It is multiple；And

Also include：

One pixel defining layer, is arranged between the organic layer, to define each pixel；And

Multiple thin film transistor (TFT)s, are arranged between the infrabasal plate and the pixel defining layer, wherein each thin film transistor (TFT) point Dui Yingyu not each organic layer.