TWI659530B - Transparent organic light-emitting diode panel - Google Patents

Abstract

A transparent organic light emitting diode panel includes a plurality of pixel units and a transparent conductive layer. Each pixel unit includes a first electrode, an organic light emitting layer, and a second electrode. The first electrode is disposed on the substrate. The organic light emitting layer is disposed on the first electrode, and the second electrode is disposed on the organic light emitting layer. The second electrode is a translucent conductive layer. Each pixel unit has a light-emitting region and a transmission region, and the first electrode, the organic light-emitting layer, and the second electrode are located in the light-emitting region. The transparent conductive layer is disposed on the second electrode, and the transparent conductive layer is located in the light emitting region and the transmission region. The second electrode of one pixel unit is electrically connected to the second electrode of the other pixel unit through a transparent conductive layer.

Description

Transparent organic light emitting diode panel

The invention relates to a panel, and in particular to a transparent organic light-emitting diode panel.

At present, in an organic light emitting diode panel, a capping layer can be used to narrow the full width at half maximum of its light emission and adjust the position of the peak of light emission, so that the organic light emitting diode panel has a better light emitting color. purity. However, if it is applied to a transparent organic light emitting diode panel, the cover layer is usually a light yellow organic layer, which may cause yellowing of the transparent region of the transparent organic light emitting diode panel.

In addition, in order to make the transparent region of the transparent organic light-emitting diode panel have a better transmittance, an electrode layer is not provided in the transparent region, and a metal wiring is used instead. However, only the metal traces are used to electrically connect the pixel units and introduce external current, which often causes a problem of IR drop. Therefore, there is an urgent need for a means to solve the aforementioned problems.

The invention provides a transparent organic light-emitting diode panel, which can improve the yellowing phenomenon of the penetration region and the problem of a steep drop in internal resistance, and has better luminous color purity.

The transparent organic light emitting diode panel of the present invention includes a plurality of pixel units and a transparent conductive layer. A plurality of pixel units are disposed on the substrate. Each pixel unit includes a first electrode, an organic light emitting layer, and a second electrode. The first electrode is disposed on the substrate. The organic light emitting layer is disposed on the first electrode. The second electrode is disposed on the organic light emitting layer, and the organic light emitting layer is located between the first electrode and the second electrode. The second electrode is a translucent conductive layer. Each pixel unit has a light-emitting region and a transmission region, and the first electrode, the organic light-emitting layer, and the second electrode are located in the light-emitting region. The transparent conductive layer is disposed on the second electrode, and the second electrode is located between the transparent conductive layer and the organic light emitting layer. The transparent conductive layer is located in the light-emitting region and the transmission region. The second electrode of one pixel unit is electrically connected to the second electrode of the other pixel unit through a transparent conductive layer.

One of the objectives of the present invention is to improve / reduce the yellowing phenomenon of a transparent organic light emitting diode panel.

One of the objectives of the present invention is to improve / reduce the problem of a sharp drop in the internal resistance of a transparent organic light emitting diode panel.

One of the objects of the present invention is to provide a transparent organic light emitting diode panel with better emission color purity.

In order to make the above features and advantages of the present invention more comprehensible, embodiments are hereinafter described in detail with reference to the accompanying drawings.

FIG. 1A is a schematic top view of a transparent organic light emitting diode panel according to an embodiment of the present invention. Fig. 1B is a schematic cross-sectional view taken along the line I-I 'in Fig. 1A.

Please refer to FIG. 1A and FIG. 1B together. The transparent organic light emitting diode panel 10 includes a plurality of pixel units 100 and a transparent conductive layer 200. The plurality of pixel units 100 are disposed on the substrate 110. Each pixel unit 100 includes a first electrode 120, an organic light emitting layer 130, and a second electrode 140. Each pixel unit 100 has a light-emitting region 150 and a transmission region 160, and the first electrode 120, the organic light-emitting layer 130, and the second electrode 140 are located in the light-emitting region 150. The transparent conductive layer 200 is located in the light emitting region 150 and the transmission region 160.

In detail, the substrate 110 includes a substrate SB and an active device 170 on the substrate SB. The active device 170 includes a source electrode 171, a drain electrode 172, a gate electrode 173, a channel layer 174, a gate insulation layer 175, and an interlayer insulation layer 176. The gate electrode 173 overlaps the channel layer 174, and a gate insulating layer 176 is sandwiched between the gate electrode 173 and the channel layer 174. In this embodiment, the active device 170 is a bottom gate thin film transistor, but the invention is not limited thereto. In other embodiments, the active device may also include a top gate thin film transistor. In this embodiment, the pixel unit 100 is schematically illustrated as an active element 170, but the present invention is not limited thereto. In other embodiments, the pixel unit may have more than one active element, and the pixel unit may further include a capacitor or other passive elements.

In this embodiment, the substrate 110 further includes a flat layer 180. The flat layer 180 is located on the active device 170, and the flat layer 180 and the gate insulation layer 175 of the active device 170 are located on opposite sides of the interlayer insulation layer 176 of the active device 170, respectively. The flat layer 180 has at least one hole 182, and the hole 182 exposes a part of the drain electrode 172.

In this embodiment, the first electrode 120 is disposed on the flat layer 180 of the substrate 110, the first electrode 120 and the source electrode 171 of the active device 170 are located on opposite sides of the flat layer 180, respectively, and the first electrode 120 and the active device 170 are located on opposite sides of the flat layer 180, respectively. The first electrode 120 may fill the hole 182 of the flat layer 180, so that the first electrode 120 is electrically connected to the drain electrode 172 of the active device 170. In this embodiment, the first electrode 120 may be a metal reflective layer, so that the light emitting direction of the organic light emitting layer 130 in the transparent organic light emitting diode panel 10 faces upward.

In this embodiment, the pixel unit 100 further includes a pixel definition layer 190. The pixel definition layer 190 is disposed on the flat layer 180 of the substrate 110 and covers a portion of the first electrode 120. The pixel definition layer 190 is located in the light emitting region 150. The pixel definition layer 190 has at least one opening 192, and the opening 192 exposes part of the first electrode 120.

In this embodiment, the organic light-emitting layer 130 is disposed in the opening 192 of the pixel definition layer 190, and the organic light-emitting layer 130 is located on an exposed portion of the first electrode 120.

In this embodiment, the second electrode 140 is disposed on the organic light emitting layer 130, and the organic light emitting layer 130 is located between the first electrode 120 and the second electrode 140. The second electrode 140 covers a part of the pixel definition layer 190 and the organic light emitting layer 130. In particular, in this embodiment, the second electrode 140 may be a semi-transparent conductive layer, and the material of the second electrode 140 may include a semi-transparent metal layer or a material having a transmittance between 30% and 70%. For example: Magnesium, silver, combinations thereof, or other suitable translucent metal layer materials, but not limited thereto. Thereby, the light emitted from the organic light emitting layer 130 in the transparent organic light emitting diode panel 10 of this embodiment can pass through the second electrode 140 and emit light upward.

It should be particularly noted that the first electrode 120 and the second electrode 140 are electrodes having different electrical properties, respectively. In this embodiment, for example, the first electrode 120 is an anode and the second electrode 140 is a cathode, but it is not limited thereto. In other embodiments, the first electrode 120 may be a cathode and the second electrode 140 may be an anode.

In this embodiment, each pixel unit 100 a more selectively includes a hole injection / transport layer 132 and an electron injection / transport layer 134. The hole injection / transport layer 132 is located between the first electrode 120 and the organic light emitting layer 130, and the hole injection / transport layer 132 is disposed in the light emitting region 150 and the penetration region 160 of each pixel unit 100a, and the electron injection / transport layer 134 is located between the organic light emitting layer 130 and the second electrode 140, and the electron injection / transport layer 134 is disposed in the light emitting region 150 and the transmission region 160 of each pixel unit 100a. In addition, the hole injection / transport layer 132 and the electron injection / transport layer 134 may have a single-layer or multilayer structure, that is, the hole injection / transport layer 132 represents any one of a hole injection layer and a hole transport layer Or more than two, the electron injection / transport layer 134 indicates any one or more of an electron injection layer and a hole transport layer.

In this embodiment, the transparent conductive layer 200 is disposed on the substrate 110 and covers the light emitting region 150 and the transmission region 160 of each pixel unit. In detail, the transparent conductive layer 200 is disposed on the second electrode 140 of the light emitting region 150, and the second electrode 140 is located between the transparent conductive layer 200 and the organic light emitting layer 130. The transparent conductive layer 200 directly contacts the second electrode 140, and the transparent conductive layer 200 completely covers the second electrode 140. In this embodiment, the configuration of the transparent conductive layer 200 may extend from the light emitting region 150 to the penetration region 160 and cover the flat layer 180 located in the penetration region 160. In this embodiment, the material of the transparent conductive layer 200 may include a metal oxide, such as indium zinc oxide (IZO), indium tin oxide (ITO), or other suitable metal oxide, but is not limited thereto.

In particular, since the transparent conductive layer 200 of the transparent organic light emitting diode panel 10 of this embodiment directly contacts the second electrode 140, and the transparent conductive layer 200 is disposed in the light emitting region 150 and the transmission region of the pixel unit 100. 160, so that the second electrode 140 of one pixel unit 100a in the transparent organic light emitting diode panel 10 can be electrically connected to the second electrode 140 of the other pixel unit 100b, 100c, etc. via the transparent conductive layer 200.

Other embodiments will be listed below for illustration. It must be noted here that the following embodiments use the component numbers and parts of the foregoing embodiments, in which the same reference numerals are used to indicate the same or similar components, and the description of the same technical content is omitted. For the description of the omitted parts, reference may be made to the foregoing embodiments, and the following embodiments are not repeated.

FIG. 2 is a schematic top view of a transparent organic light emitting diode panel according to another embodiment of the present invention. Please refer to FIG. 1A and FIG. 2 at the same time. The transparent organic light emitting diode panel 10a of this embodiment is similar to the transparent organic light emitting diode panel 10 of FIG. 1A, but the main difference is that The organic light emitting diode panel 10 a further includes a wire 300.

In this embodiment, the transparent organic light emitting diode panel 10 a includes a plurality of pixel units 100, a transparent conductive layer 200, and a conductive wire 300. Each pixel unit 100 has a light emitting region 150 and a transmission region 160. The second electrode 140 of each pixel unit 100 is disposed in the light emitting region 150. The conductive line 300 is disposed in the light emitting region 150 and the penetration region 160.

In detail, referring to FIG. 2, the wire 300 is disposed between the second electrode 140 of one pixel unit 100 a located in the light-emitting area 150 and the second electrode 140 of the other pixel unit 100 b and 100 c located in the light-emitting area 150. That is, the second electrode 140 of one pixel unit 100 a can be electrically connected to the second electrode 140 of the other pixel unit 100 b through the penetration region 160 through the wire 300. The second electrode 140 of one pixel unit 100a can also be electrically connected to the second electrode 140 of the other pixel unit 100c via a wire 300. Therefore, the transparent organic light-emitting diode panel 10a of this embodiment can electrically connect each pixel unit through the transparent conductive layer 200 and the wire 300 and introduce external current, thereby further improving the problem of a steep drop in internal resistance.

In this embodiment, the conductive wire 300 and the second electrode 140 may be integrally formed, that is, the conductive wire 300 and the second electrode 140 may be a same film layer. The material of the wire may include metal, for example, the material of the wire may include magnesium, silver, a combination thereof, or other suitable metal materials, but is not limited thereto. The second electrode of one of the pixel units is electrically connected to the second electrode of the other pixel unit via the transparent conductive layer.

In summary, in a transparent organic light emitting diode panel according to an embodiment of the present invention, a transparent conductive layer is disposed on the light emitting region and the transmission region of the pixel unit, and the transparent conductive layer is disposed on the second electrode. The transparent conductive layer is brought into direct contact with the second electrode. Thereby, the second electrode of one pixel unit of the transparent organic light emitting diode panel of this embodiment can be electrically connected to the second electrode of the other pixel unit through the transparent conductive layer, thereby improving the conventional knowledge. It has the problem of yellowing and a sharp drop in internal resistance. In addition, in the transparent organic light-emitting diode panel of some embodiments, the pixel units can also be electrically connected using the configuration of the transparent conductive layer and the wires, thereby further improving the problem of a steep drop in internal resistance. In addition, the transparent organic light-emitting diode panel of the present invention also has better efficacy of emitting color purity.

Although the present invention has been disclosed as above with the examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some modifications and retouching without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be determined by the scope of the attached patent application.

10, 10a‧‧‧Transparent organic light emitting diode panel

100, 100a, 100b, 100c ‧‧‧ pixel units

110‧‧‧ substrate

120‧‧‧first electrode

130‧‧‧Organic light emitting layer

132‧‧‧ Hole injection / transmission layer

134‧‧‧electron injection / transport layer

140‧‧‧Second electrode

150‧‧‧light-emitting area

160‧‧‧ penetration zone

170‧‧‧active components

171‧‧‧Source

172‧‧‧Drain

173‧‧‧Gate

174‧‧‧Channel layer

175‧‧‧Gate insulation

176‧‧‧Interlayer insulation

180‧‧‧ flat layer

182‧‧‧hole

190‧‧‧pixel definition layer

200‧‧‧ transparent conductive layer

300‧‧‧Wire

SB‧‧‧ substrate

FIG. 1A is a schematic top view of a transparent organic light emitting diode panel according to an embodiment of the present invention. Fig. 1B is a schematic cross-sectional view taken along the line I-I 'in Fig. 1A. FIG. 2 is a schematic top view of a transparent organic light emitting diode panel according to another embodiment of the present invention.

Claims (9)

A transparent organic light-emitting diode panel includes: a plurality of pixel units disposed on a substrate, and each pixel unit includes: a first electrode disposed on the substrate; and an organic light-emitting layer disposed on the substrate. A first electrode; and a second electrode disposed on the organic light-emitting layer, wherein the second electrode is a translucent conductive layer, each pixel unit has a light-emitting region and a penetration region, the first electrode, The organic light emitting layer and the second electrode are located in the light emitting area; a transparent conductive layer is disposed on the second electrodes, and the transparent conductive layer is located in the light emitting areas and the penetration areas, and one of the drawings The second electrode of the pixel unit is electrically connected to the second electrode of another pixel unit via the transparent conductive layer; and a wire is disposed in the light emitting region and the penetration region, so that one of the pixel units The second electrode is electrically connected to the second electrode of another pixel unit via the wire, wherein a material of the wire includes metal. The transparent organic light-emitting diode panel according to item 1 of the patent application scope, wherein the first electrode is a metal reflective layer. The transparent organic light-emitting diode panel according to item 1 of the patent application scope, wherein the transparent conductive layer directly contacts the second electrode. The transparent organic light emitting diode panel according to item 1 of the scope of patent application, wherein a material of the transparent conductive layer includes a metal oxide. The transparent organic light-emitting diode panel according to item 1 of the scope of patent application, wherein the wire and the second electrode are in the same film layer. The transparent organic light-emitting diode panel according to item 1 of the scope of patent application, wherein each of the pixel units further includes: an electron injection / transport layer disposed between the second electrode and the organic light-emitting layer; and A hole injection / transport layer is disposed between the organic light emitting layer and the first electrode. According to the transparent organic light-emitting diode panel described in item 1 of the patent application scope, each of the pixel units further includes an active element, and the first electrode of each of the pixel units is electrically connected to the active element. The transparent organic light-emitting diode panel according to item 1 of the patent application scope, wherein the second electrode is a semi-transparent metal layer. According to the transparent organic light-emitting diode panel described in item 1 of the scope of patent application, the transmittance of the second electrode is between 30% and 70%.