TWI227650B - Organic light-emitting diode - Google Patents

Abstract

An organic light-emitting diode (OLED) is provided. It comprises a substrate, an anode layer, a cathode layer, an organic emitting layer, and a optical compensating film, wherein the organic emitting layer comprises a red organic emitting layer, a blue organic emitting layer, and a green organic emitting layer. The anode layer is located on the substrate. The organic emitting layer is located on the anode layer. The cathode layer is located on the organic emitting layer. The optical compensating film is located between the substrate and the anode layer under the red and blue organic emitting layer, whereby rising the transmittance of red light and blue light. Moreover, there is no optical compensating film under the green organic emitting layer to keep the transmittance of green light.

Description

1227650 5. Description of the invention (1) The technical field to which the invention belongs i. The present invention relates to an organic light emitting diode (0rganic Emitting Diode, referred to as 0LED), and in particular to an organic light emitting diode of: transmittance . The previous technology has undergone the development of South Technology's video products, especially digital or imaging devices have become common in ordinary life to produce some digital video or image devices. The display is an important Information. The user can read the information from the display or control the operation of the device. Moreover, in order to match the modern living mode, the volume of V-shirts is gradually becoming thinner and lighter. Although the traditional cathode layer radiation still has its advantages, it needs to occupy a large volume and consume power. Due to the combination of optoelectronic technology and semiconductor manufacturing technology, panel-type displays have become common display products such as liquid crystal displays or light-emitting displays. Among them, the organic light-emitting diode is a self-luminous element. Because of the low-voltage DC drive, high brightness, high efficiency, high contrast value, thin, and its luminous color is red (red, R for short), green (gree η G ), And the degrees of freedom from the three primary colors of blue (blue, B for short) to white. This organic light-emitting diode is considered to be the next-generation planar focal point of the next generation. Organic light emitting diode technology not only has the advantages of high-resolution liquid crystal display, active light emission of light diode, response speed, electric cooling light source, etc., but also has many advantages such as wide viewing angle and low color contrast effect. Therefore, organic light emitting diodes can be widely used

Light through the video products ° is. Components, and then control or monitor, so the development is organic and its characteristics and lightness, referred to as 8, because the lightness of the board is thin and fast and saves money and costs.

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1227650 V. Description of the invention (2) Back of display or indication board Personal digital assistant (PDA), etc. From the viewpoint of driving mode (passive matrix), there are two types of driving modes. The passive type is often simple and therefore the cost is low. It is made directly on the panel using thin-film transistor technology. It can be used even on large scales. However, due to the traditional structure, the light is lost. Generally speaking, the light is 90%, while the organic luminosity is about 80%. In addition, the transparency of green light is about what kind of light the diode emits. Therefore, the object of the present invention is to improve the transparency of light. Still another object of the present invention is to provide one liter of red and blue light transparency, and another object of the present invention is to provide red (R) and green (G) of an organic light emitting diode to be optimized. There are light sources, mobile phones, digital cameras, and other methods. The active technology driver has a volume-inch panel such as organic light emission, where the emission directly passes through the diode. If the organic light is 87%, there will be a light-emitting diode that is a light-emitting diode. When the short and computer and flat diodes are included, the light or red light emitting diodes emitted by the glass substrate must be divided. In other words, the problematic body of the loss can be divided into the matrix, and the TV is reduced to multiple layers. When there will be light, it will emit whatever is passive.) The non-characteristics of the driving structure will drive the needs of the film. The brightness of the film group is transparent, and the transparent green light machine emits an organic light-emitting diode. Organic light emitting diodes to improve the transparency of green light while maintaining. Organic light-emitting diodes to achieve 'blue (B) three primary colors

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Page 7 1227650 V. Description of the invention (3) According to the above and other purposes, the body includes a substrate, an anode layer, and an optical compensation film, wherein the organic layer and the blue organic light-emitting layer are located on the substrate. Luminescence is placed on the organic light emitting layer. And the optical red light emitting layer and the blue light. In addition, the present invention further proposes an active plate, a plurality of thin film transistors, an anode layer, and an optical compensation film. The light layer, a blue organic light emitting layer, and the polar layer are located on the substrate. On the organic light emitting layer, the thin film anode layer is electrically connected. The optically compensated red light organic light-emitting layer and blue light are somewhere. In addition, the organic light emitting device for green light uses an optical compensation film disposed between the plate and the anode layer, and the transparency of the blue light can reach an average of 900/0 under the organic light emitting layer. This layer does not add optical compensation, so the invention can Hair performance is optimized. In order to make the above and the present invention an organic light emitting diode, a cathode layer, and an organic light emitting layer, the light emitting layer includes a red organic light emitting layer and a green organic light emitting layer. The anode layer is on the anode layer. The cathode layer and the compensation film are arranged in the organic light-emitting layer. The substrate under the organic light-emitting layer and the anode layer are not provided with a light compensation film. The organic light emitting diode includes a base layer, a cathode layer, and an organic light emitting layer. The organic light emitting layer includes a red organic light emitting layer and a green organic light emitting layer. The solar layer is on the anode layer. The cathode layer transistor is formed on the substrate, and the compensation film is disposed under the organic light emitting layer of the organic light emitting layer and the substrate and the anode layer are not provided with a light compensation film. Red light and blue light under the organic light emitting layer to improve its transparency, so red light and. Furthermore, the present invention is particularly directed to a green light compensation film to maintain green light transparency. The red, green, and blue primary colors of the light-polar body can make its purpose, characteristics, and advantages clearer.

10254twf.ptd Page 8 1227650 V. Description of the invention (4) In conjunction with the attached drawings, make it easy to understand in detail. 'The following is a description of the preferred embodiment. The first implementation of the method is t. According to the invention, a cross-sectional view of the organic light-emitting diode-body according to the embodiment of 筮 ^ Α 4 M d di-lit. Please moxibustion Zhao Di 1 country ^ Λ. Month, ..., Figure 1. The organic light-emitting diode in this embodiment is applied to a passive organic light-emitting diode. The substrate name is-substrate 102-the anode layer 104 and a cathode layer 106. Layer 110 and-optical compensation film 1G8, wherein the optical compensation film m and the organic light emitting layer ⑴ light layer 112, a blue light organic light emitting layer 114, and a green light organic light emitting layer 116; the material of the anode layer 104 may be indium tin oxide (IT〇), indium zinc oxide (IZ0), aluminum oxide (AZ0) or zinc oxide (Zη〇); the material of the cathode layer 106 can be aluminum, aluminum / lithium fluoride, calcium, magnesium / silver Or silver. Please continue to refer to FIG. 1. In this embodiment, the arrangement of each layer of the organic light-emitting diode 丨 00 is located on the substrate 102, and the organic light-emitting layer 110 is located on the anode layer 104. The cathode layer 6 is disposed on the organic light emitting layer i Q. The optical compensation film 108 is disposed between the red organic light-emitting layer 112 and the blue organic light-emitting layer 114 between the substrate 102 and the anode layer in the organic light-emitting layer. In addition, an optical compensation film 108 cannot be provided under the green organic light emitting layer 116 to maintain the transparency of green light. In addition, the organic light emitting diode in this embodiment method may further include an electron transport layer between the organic light emitting layer 110 and the cathode layer 106, and the surface of the organic light emitting layer 110 facing the anode layer 104 may be added. Upper hole

l〇254twf.ptd Page 9 1227650 V. Description of the invention (5) The transmission layer and a hole injection layer. Second Embodiment When the present invention is applied to an active organic light emitting diode, see FIG. 2A and FIG. 2B. Figures 2A and 2B are cross-sectional views of an active organic light emitting diode according to a second embodiment of the present invention. Photograph 2A and 2B of Qing Cangzhao, the active organic light emitting diode includes a substrate 202, a thin film transistor 220, an anode layer 204, a cathode layer 206, an organic light emitting layer and an The optical compensation film 208 may be made of silicon nitride. The organic light-emitting layer in FIG. 2A is a red and blue organic light-emitting layer 21 2/214; that is, whether the red light-emitting organic layer or the blue organic light-emitting layer is applicable to the structure shown in FIG. 2A . The organic light-emitting layer in FIG. 2B is a green light-emitting organic layer 2 1 6. In addition, the material of the anode layer 204 can be indium tin oxide, indium oxide, zinc aluminum oxide, or zinc oxide; the material of the cathode layer 106 can include aluminum, aluminum / fluoride, calcium, and magnesium. / Silver or silver. The thin film transistor 220 has a gate 222, a source / drain 224, a channel layer 2 2 6 and an insulating layer covering the gate 2 22. In addition, a protective layer 228 covers the thin film transistor 220. Please continue to refer to FIG. 2A. The anode layer 204 of the active organic light emitting diode is located on the substrate 202. The red and blue organic light emitting layers 212/214 are located on the anode layer 204. The cathode layer 206 is disposed on the red and blue organic light emitting layers 212/214. The thin film transistor 220 is formed on the substrate 202, and one end of the source / inverter 224 is electrically connected to the anode layer 204. The optical compensation film 208 is disposed on the substrate 202 under the red and blue organic light emitting layers 212/2 丨 4.

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V. Description of the invention (6) Between the anode layer and 204 to increase the transparency of red and blue light. In this embodiment, the optical compensation film 208 can be used as the key two. In addition, the insulating layer of the gate electrode 2 2 2 is covered in the middle.电, transistor 2 2 2 In addition, please refer to Figure 2B again. The only difference between the active organic system and Figure 2A is the green organic light-emitting layer gig ° between the substrate 2 0 2 and the anode layer 2 0 4 There is no optical compensation gland, and the lower part of the sun is maintained to maintain green light. To support the features of the present invention, please refer to FIG. 3. The light shown in FIG. 3 passes through the glass substrate and the broken glass substrate +, respectively. A graph of the relationship between the spectrum and transmittance of the anode layer and the transmission of the glass substrate + optical compensation film + anode layer. Please refer to Figure 3. The three curves in this figure are respectively the light transmitted through the glass substrate, the glass substrate plus a layer of indium tin 7 oxide ^ do not transmit through the anode layer, and the light through the glass substrate plus a layer of silicon nitride optical compensation Transparency of the structure formed by the film plus the anode layer of indium tin oxide

Diagram with spectrum. X From Fig. 3, it can be seen that 'when light directly penetrates through a glass substrate, the transparency of any color light is greater than 90%. When the light penetrates through the glass substrate plus the indium tin oxide anode layer, it can be learned from the range of the spectrum that the light transmittance in the range of red and blue light (about 600-7000 nm) is about 8 The transmittance in the range of green light (about 500 nm) is about 87 /. ° In order to improve the transparency of the light, when adding an optical compensation film between the glass substrate and the indium tin oxide anode layer, and then measuring the transparency, it will be found that although the transmittance of red and blue light can be changed from 80% of the original Raised to more than 90% ', but the green light transmittance has been reduced from 87% to 80%. So this

1227650 5. Description of the invention (7) The solution adopted in the invention is to selectively add an optical compensation film to the organic light-emitting diode structure, so that the red (R), green (G), and blue ( B) The performance of the three primary colors is optimized. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and retouches without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be determined by the scope of the attached patent application.

10254twf.ptd Page 12 1227650 Brief description of the drawings Figure 1 is a schematic cross-sectional view of an organic light emitting diode according to a first embodiment of the present invention; Figures 2A and 2B are drawings according to one of the first A schematic cross-sectional view of the active organic light emitting diode of the second embodiment; and the spectrum and transparency of the light obtained through the transmission of the glass substrate, glass substrate + anode layer, and glass substrate + optical compensation film + anode layer shown in FIG. relation chart. Explanation of reference numerals 1 0 0: Organic light emitting diodes 102, 20 2: Substrates 104, 204 ·· Anode layer 1 0 6, 2 0 6: Cathode layer 108, 208: Optical compensation film 1 1 0: Organic light emitting layer 1 1 2: Red organic light emitting layer 1 1 4: Blue organic light emitting layer 116, 216: Green organic light emitting layer 21 2/214: Red and blue organic light emitting layer 220 Thin film transistor 222 Gate 224 Source / Drain Pole 226 Channel layer 228 Protective layer

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Claims (1)

1227650 VI. Scope of patent application 1. An organic light-emitting diode, comprising: '^ substrate'-an anode layer 'on the substrate'-an organic light-emitting layer 'on the anode layer' The organic light-emitting layer includes a red-light organic A light emitting layer, a blue organic light emitting layer 'and a green organic light emitting layer; a cathode layer on the organic light emitting layer; and an optical compensation film disposed under the red organic light emitting layer and the blue organic light emitting layer Between the substrate and the anode layer. 2. The organic light emitting diode according to item 1 of the scope of the patent application, wherein the material of the optical compensation film includes silicon nitride. 3. The organic light-emitting diode according to item 1 of the scope of patent application, wherein the material of the anode layer includes one of indium tin oxide, indium zinc oxide, zinc oxide, and zinc oxide. 4. The organic light-emitting diode according to item 1 in the scope of patent application, wherein the material of the cathode layer includes aluminum, aluminum / lithium fluoride, calcium, magnesium / silver, and silver. The organic light emitting diode according to item 1, further comprising an electron transport layer between the organic light emitting layer and the cathode layer. 6. The organic light emitting diode according to item 1 of the scope of patent application, wherein a hole injection layer is further included between the organic light emitting layer and the anode layer. 7. The organic light emitting diode according to item 6 of the scope of patent application, wherein a far hole organic light emitting layer and the hole injection layer further include a hole transporting layer. 8 · — an active organic light emitting diode, including at least: 1227650 VI. Application scope: a substrate; an anode layer on the substrate; an organic light emitting layer on the anode layer; the organic light emitting layer includes a green organic light emitting layer, a red organic light emitting layer, and a A blue organic light emitting layer; a cathode layer on the organic light emitting layer; a plurality of thin film transistors formed on the substrate and electrically connected to the anode layer; and an optical compensation film disposed on the red organic light emitting layer The light emitting layer and the substrate and the anode layer under the blue organic light emitting layer. 9. The active organic light emitting diode as described in item 8 of the scope of patent application, wherein the material of the optical compensation film includes silicon nitride. 10 · The active organic light-emitting diode according to item 8 of the scope of patent application, wherein the thin film transistor includes at least: a gate; a channel layer located above the gate; an insulating layer located at the gate Between the electrode and the channel layer to cover the gate electrode; and a source / drain electrode located on both sides of the channel layer 2 2 6 above the gate electrode. 1 1 · The active organic light emitting diode according to item 10 of the scope of patent application, wherein one end of the source / drain is electrically connected to the anode layer. 12. The active organic light emitting diode as described in item 10 of the scope of patent application, wherein the function of the optical compensation film includes the insulating layer as the thin film transistor. 10254twf.ptd Page 15 1227650 6. Scope of patent application 1 3. The active organic light emitting diode described in item 8 of the scope of patent application, wherein the material of the anode layer includes indium tin oxide. 1 4. The active organic light-emitting diode according to item 8 of the scope of patent application, wherein the material of the cathode layer includes one of aluminum, aluminum / lithium fluoride, calcium, magnesium / silver, and silver. 1 5. The active organic light emitting diode as described in item 8 of the scope of patent application, wherein an electron transporting layer is further included between the organic light emitting layer and the cathode layer. 16. The active organic light-emitting diode according to item 8 of the scope of patent application, wherein a hole injection layer is further included between the organic light-emitting layer and the anode layer. 1 7. The active organic light emitting diode according to item 16 of the scope of patent application, wherein a hole transporting layer is further included between the organic light emitting layer and the hole injection layer. 10254twf.ptd Page 16