CN111341820B - Display panel and display device - Google Patents
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- CN111341820B CN111341820B CN202010170263.2A CN202010170263A CN111341820B CN 111341820 B CN111341820 B CN 111341820B CN 202010170263 A CN202010170263 A CN 202010170263A CN 111341820 B CN111341820 B CN 111341820B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/14—Carrier transporting layers
- H10K50/16—Electron transporting layers
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/805—Electrodes
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
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Abstract
The invention discloses a display panel and a display device, wherein the display panel is provided with a first display area and a second display area, and comprises a cathode layer, a first electrode layer and a second electrode layer; a light extraction layer on the cathode layer, including a first light extraction layer and a second light extraction layer; the compensation layer comprises a first compensation layer positioned in the first display area and a second compensation layer positioned in the second display area, the first compensation layer comprises a first electron transport layer, and the second compensation layer comprises a second electron transport layer; the sum of the thicknesses of the first compensation layer, the first cathode layer and the first light extraction layer is equal to the sum of the thicknesses of the second compensation layer, the second cathode layer and the second light extraction layer, and the thickness of the first light extraction layer is larger than that of the second light extraction layer. The display panel provided by the embodiment of the invention can realize that at least part of the area of the display panel is light-permeable and displayable, and is convenient for the under-screen integration of the photosensitive assembly.
Description
Technical Field
The invention relates to the field of display, in particular to a display panel and a display device.
Background
With the rapid development of electronic devices, the requirements of users on screen occupation ratio are higher and higher, so that the comprehensive screen display of the electronic devices is concerned more and more in the industry.
Conventional electronic devices such as mobile phones, tablet computers, etc. need to integrate components such as front-facing cameras, earphones, infrared sensing elements, etc. In the prior art, a groove (Notch) or an opening may be formed in the display screen, and external light may enter the photosensitive element located below the screen through the groove or the opening. However, these electronic devices are not all full-screen in the true sense, and cannot display in each area of the whole screen, for example, the corresponding area of the front camera cannot display the picture.
Disclosure of Invention
The embodiment of the invention provides a display panel and a display device, which can realize that at least part of the area of the display panel is light-permeable and can display, and are convenient for the under-screen integration of a photosensitive assembly.
In one aspect, an embodiment of the present invention provides a display panel, which has a first display area and a second display area, where light transmittance of the first display area is greater than that of the second display area, and the display panel includes a cathode layer including a first cathode layer located in the first display area and a second cathode layer located in the second display area; a light extraction layer on the cathode layer, the light extraction layer including a first light extraction layer in the first display region and a second light extraction layer in the second display region; the compensation layer comprises a first compensation layer positioned in the first display area and a second compensation layer positioned in the second display area, the first compensation layer comprises a first electron transmission layer positioned under the first cathode layer, and the second compensation layer comprises a second electron transmission layer positioned under the second cathode layer; the sum of the thicknesses of the first compensation layer, the first cathode layer and the first light extraction layer is equal to the sum of the thicknesses of the second compensation layer, the second cathode layer and the second light extraction layer, and the thickness of the first light extraction layer is larger than that of the second light extraction layer.
According to an aspect of the embodiments of the present invention, the refractive index of the first cathode layer is smaller than the refractive index of the first electron transport layer, and the refractive index of the first cathode layer is smaller than the refractive index of the first light extraction layer.
According to an aspect of the embodiment of the present invention, the refractive index of the first electron transport layer is smaller than the refractive index of the first light extraction layer.
According to one aspect of embodiments of the invention, the first compensation layer further comprises a first encapsulation layer on the first light extraction layer, and the second compensation layer further comprises a second encapsulation layer on the second light extraction layer.
According to an aspect of an embodiment of the invention, the thickness of the first cathode layer is smaller than the thickness of the second cathode layer.
According to an aspect of an embodiment of the invention, the thickness of the first compensation layer is equal to the thickness of the second compensation layer.
According to an aspect of an embodiment of the present invention, a thickness of the first electron transport layer is equal to a thickness of the second electron transport layer, and a thickness of the first encapsulation layer is equal to a thickness of the second encapsulation layer.
According to an aspect of an embodiment of the invention, the thickness of the first cathode layer is equal to the thickness of the second cathode layer, and the thickness of the first cathode layer and the thickness of the second cathode layer are both less than or equal to
According to an aspect of the embodiment of the invention, the refractive index of the second cathode layer is smaller than the refractive index of the second electron transport layer, and the refractive index of the second cathode layer is smaller than the refractive index of the second light extraction layer.
According to an aspect of the embodiment of the present invention, the refractive index of the second electron transporting layer is smaller than the refractive index of the second light extraction layer.
According to an aspect of an embodiment of the invention, the thickness of the first compensation layer is smaller than the thickness of the second compensation layer.
According to an aspect of the embodiments of the present invention, the thickness of the first encapsulation layer is equal to the thickness of the second encapsulation layer, and the thickness of the first electron transport layer is less than the thickness of the second electron transport layer.
According to one aspect of an embodiment of the invention, a substrate;
a driving device layer on the substrate, the device layer including a first anode electrode in the first display region and a second anode electrode in the second display region;
and the pixel defining layer is positioned on the device layer and is positioned below the first electron transmission layer and the second electron transmission layer, and the pixel defining layer comprises a first pixel opening positioned in the first display area and a second pixel opening positioned in the second display area.
According to one aspect of the embodiments of the present invention, an area of an orthographic projection of the first anode on the substrate is smaller than an area of an orthographic projection of the second anode on the substrate.
According to an aspect of the embodiments of the present invention, the orthographic projection of the first anode on the substrate is composed of one first pattern unit or is composed of two or more first pattern units which are spliced, and the first pattern unit comprises at least one selected from the group consisting of a circle, an ellipse, a dumbbell, a gourd, and a rectangle.
According to an aspect of the embodiments of the present invention, the orthographic projection of the first pixel opening on the substrate is composed of one second graphic element or is composed of a concatenation of two or more second graphic elements, and the second graphic element includes at least one selected from the group consisting of a circle, an ellipse, a dumbbell, a gourd, and a rectangle.
According to an aspect of an embodiment of the invention, the first anode is a light-transmitting electrode.
According to an aspect of an embodiment of the invention, the first anode is a reflective electrode.
According to an aspect of an embodiment of the invention, the first anode comprises a layer of indium tin oxide or indium zinc oxide.
According to an aspect of an embodiment of the invention, the first cathode layer comprises a magnesium silver alloy layer.
According to an aspect of the embodiments of the present invention, the electron mobility of the first electron transport layer is greater than or equal to 10 - 6 cm 2 /Vs。
According to one aspect of an embodiment of the present invention, the material of the first electron transport layer comprises a nitrogen heteroaryl derivative.
According to one aspect of the embodiments of the present invention, further comprising a hole transport layer including a first hole transport layer located under the first electron transport layer, the first hole transport layer having a hole mobility of 10 or more -6 cm 2 /Vs。
According to one aspect of embodiments of the present invention, the material of the first hole transport layer comprises at least one of an aromatic amine, a spirofluorene, or a carbazole, furan, thiophene substituent.
On the other hand, the embodiment of the invention also provides a display device, which comprises the display panel.
In the display panel of the embodiment of the invention, the display panel comprises the cathode layer, the light extraction layer and the compensation layer, and the sum of the thicknesses of the first compensation layer, the first cathode layer and the first light extraction layer is equal to the sum of the thicknesses of the second compensation layer, the second cathode layer and the second light extraction layer, so that the thicknesses of the device layers of the first display area and the second display area tend to be consistent, and the lengths of the resonant cavities are consistent. And the thickness of the first light taking out layer is greater than that of the second light taking out layer, so that the light output quantity of the first display area can be improved, and the display effect of the first display area is improved. When the area of the anode of the first display area is small in order to improve the light transmittance of the first display area, the first display area can still have a good display effect. Therefore, the display panel provided by the embodiment of the invention can realize that at least partial area of the display panel is light-permeable and displayable, and is convenient for the under-screen integration of the photosensitive assembly.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings in which like or similar reference characters refer to like or similar parts and which are not necessarily drawn to scale.
FIG. 1 shows a schematic top view of a display panel according to an embodiment of the invention;
FIG. 2 shows an enlarged partial view of an exemplary region Q of FIG. 1;
FIG. 3 illustrates an exemplary cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 showsbase:Sub>A cross-sectional view A-A of FIG. 2 in another example;
FIG. 5 shows a schematic top view of a display device according to an embodiment of the invention;
fig. 6 shows a cross-sectional view along the line B-B in fig. 5.
Description of the reference numerals:
100. a display panel; 110. a cathode layer; 111. a first cathode layer; 112. a second cathode layer; 120. a light extraction layer; 121. a first light extraction layer; 122. a second light extraction layer; 130. an electron transport layer; 131. a first electron transport layer; 132. a second electron transport layer; 140. a packaging layer; 141. a first encapsulation layer; 142. a second encapsulation layer; 150. a driving device layer; 151. a first anode; 152. a second anode; 160. a pixel defining layer; 161. a first pixel opening; 162. a second pixel opening; 170. a hole transport layer; 171. a first hole transport layer; 172. a second hole transport layer; 180. a substrate; 191. a first pixel unit; 191a, a first light emitting subpixel; 192. a second pixel unit; 191a, a second light-emitting sub-pixel;
200. the photosensitive assembly.
Detailed Description
Features of various aspects and exemplary embodiments of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of another like element in a process, method, article, or apparatus that comprises the element.
It will be understood that when a layer, region or layer is referred to as being "on" or "over" another layer, region or layer in describing the structure of the component, it can be directly on the other layer, region or layer or intervening layers or regions may also be present. Also, if the component is turned over, one layer or region may be "under" or "beneath" another layer or region.
On electronic devices such as mobile phones and tablet computers, it is necessary to integrate a photosensitive component such as a front camera, an infrared light sensor, a proximity light sensor, and the like on the side where the display panel is provided. In some embodiments, a transparent display area may be disposed on the electronic device, and the photosensitive component is disposed on the back of the transparent display area, so that full-screen display of the electronic device is achieved under the condition that the photosensitive component is ensured to work normally.
In order to improve the light transmittance of the transparent display region and facilitate the arrangement of the pixel driving circuit of the sub-Pixels in the transparent display region, it is often necessary to reduce the pixel density (PPI) of the transparent display region, or even a portion of the display region around the transparent display region, so that the PPI of the transparent display region is lower than that of the main display region of the display panel.
Or in order to improve the light transmittance of the light-transmitting display area and facilitate the arrangement of the pixel driving circuit of the sub-pixels in the light-transmitting display area, the metal anode area of the light-transmitting display area is reduced to improve the light transmittance of the light-transmitting display area, so that an obvious display boundary can be formed between the light-transmitting display area and the normal display area when the display panel displays, and the display effect is influenced.
In order to solve the above problems, embodiments of the present invention provide a display panel and a display device, and the following describes embodiments of the display panel and the display device with reference to the accompanying drawings.
Embodiments of the present invention provide a display panel, which may be an Organic Light Emitting Diode (OLED) display panel.
Fig. 1 is a schematic top view of a display panel according to an embodiment of the present invention, and fig. 2 is a partially enlarged view of a Q region of fig. 1.
The display panel 100 has a first display area AA1 and a second display area AA2, and the light transmittance of the first display area AA1 is greater than that of the second display area AA 2.
Herein, it is preferable that the light transmittance of the first display area AA1 is 15% or more. In order to ensure that the light transmittance of the first display area AA1 is greater than 15%, even greater than 40%, or even higher, the light transmittance of each functional film layer of the display panel 100 in this embodiment is greater than 80%, and even at least a portion of the functional film layers is greater than 90%.
According to the display panel 100 of the embodiment of the invention, the light transmittance of the first display area AA1 is greater than that of the second display area AA2, so that the display panel 100 can integrate a photosensitive component on the back of the first display area AA1, and realize the integration under the screen of the photosensitive component, such as a camera, and meanwhile, the first display area AA1 can display a picture, thereby increasing the display area of the display panel 100 and realizing the overall screen design of the display device.
The display panel 100 includes a plurality of first pixel units 190 located in the first display area AA1 and a plurality of second pixel units 192 located in the second display area AA 2. The first pixel unit 190 includes a first light-emitting subpixel 191a, and the first light-emitting subpixel 191a includes, for example, a red subpixel, a green subpixel, and a blue subpixel. The second pixel unit 192 includes a second light emitting sub-pixel 191a, and the second light emitting sub-pixel 191a includes, for example, a red sub-pixel, a green sub-pixel, and a blue sub-pixel. The arrangement structure of the plurality of first pixel units 190 in the first display area AA1 and the arrangement structure of the plurality of second pixel units 192 in the first display area AA1 are, for example, the same or different.
Referring to fig. 3 and 4 together, fig. 3 showsbase:Sub>A partial cross-sectional view atbase:Sub>A-base:Sub>A of fig. 2, according to one embodiment; fig. 4 showsbase:Sub>A partial cross-sectional view atbase:Sub>A-base:Sub>A in fig. 2, according to another embodiment.
The display panel 100 includes a cathode layer 110, a light extraction layer 120, the light extraction layer 120 being located on the cathode layer 110, and a compensation layer including an electron transport layer 130 located below the cathode layer 110 and an encapsulation layer 140 located on the light extraction layer 120.
The cathode layer 110 includes a first cathode layer 111 positioned at the first display area AA1 and a second cathode layer 112 positioned at the second display area AA 2. The light extraction layer 120 includes a first light extraction layer 121 positioned at the first display area AA1 and a second light extraction layer 122 positioned at the second display area AA 2. The compensation layer includes a first compensation layer positioned at the first display area AA1 including a first electron transport layer 131 positioned under the first cathode layer 111 and a second compensation layer positioned at the second display area AA2 including a second electron transport layer 132 positioned under the second cathode layer 112.
The sum of the thicknesses of the first compensation layer, the first cathode layer 111, and the first light extraction layer 121 is equal to the sum of the thicknesses of the second compensation layer, the second cathode layer 112, and the second light extraction layer 122, and the thickness of the first light extraction layer 121 is greater than the thickness of the second light extraction layer 122.
In the display panel 100 according to the embodiment of the present invention, the sum of the thicknesses of the first compensation layer, the first cathode layer 111, and the first light extraction layer 121 is equal to the sum of the thicknesses of the second compensation layer, the second cathode layer 112, and the second light extraction layer 122, so that the thicknesses of the device layers in the first display area AA1 and the second display area AA2 tend to be the same, the resonant cavity lengths are the same, and the optical paths are the same.
In addition, the thickness of the first light extraction layer 121 is greater than that of the second light extraction layer 122, so that the light output amount of the first display area AA1 can be increased, the brightness of the first light-emitting sub-pixel 191a can be increased, and the display effect of the first display area AA1 can be improved. When the anode area of the first display area AA1 is small in order to improve the light transmittance of the first display area AA1, or when the pixel PPI of the first display area AA1 is low, it can still be ensured that the first display area AA1 has a good display effect, and the display difference between the first display area AA1 and the second display area AA2 is reduced. Therefore, the display panel 100 of the embodiment of the invention can realize that at least a partial area of the display panel 100 is light-permeable and displayable, which is convenient for the under-screen integration of the photosensitive assembly 200.
In some alternative embodiments, the display panel 100 further includes a substrate 180 and a driving device layer 150 on the substrate 180, and the driving device layer 150 includes a first anode 151 located at the first display area AA1 and a second anode 152 located at the second display area AA 2. The substrate 180 may be made of a light-transmitting material such as glass or Polyimide (PI). The driving device layer 150 may include pixel circuits for driving the display of the respective light emitting sub-pixels.
The first anode 151 is disposed corresponding to the first light emitting sub-pixel 191a of the first display area AA1, for example. For example, the first anode 151 is disposed corresponding to red, green, and blue sub-pixels. The second anode 152 is disposed corresponding to the second light emitting sub-pixel 191a of the second display area AA2, for example. For example, the second anode 152 is disposed corresponding to the red, green, and blue sub-pixels.
In some alternative embodiments, the area of the orthographic projection of the first anode 151 on the substrate 180 is less than the area of the orthographic projection of the second anode 152 on the substrate 180. The area of the first anode 151 is small, so that the light transmittance of the first display area AA1 can be improved, and the photosensitive assembly 200 can be conveniently integrated under a screen.
In some embodiments, the first anode 151 is, for example, a light-transmissive electrode. In some embodiments, the first anode 151 includes an Indium Tin Oxide (ITO) layer or an Indium zinc Oxide (izo) layer.
In other embodiments, the first anode 151 is, for example, a reflective electrode, and the first anode 151 includes a first light-transmissive conductive layer, a reflective layer on the first light-transmissive conductive layer, and a second light-transmissive conductive layer on the reflective layer. The first and second transparent conductive layers may be ITO, indium zinc oxide, etc., and the reflective layer may be a metal layer, such as made of silver.
In some embodiments, the first cathode layer 111 comprises, for example, a magnesium silver alloy layer. The second cathode layer 112 comprises, for example, a magnesium silver alloy layer. The first cathode layer 111 and the second cathode layer 112 are interconnected to form a common electrode layer.
In some embodiments, the orthographic projection of each first anode 151 on the substrate 180 is composed of one first pattern unit or is composed of a concatenation of more than two first pattern units, the first pattern units comprising at least one selected from the group consisting of a circle, an ellipse, a dumbbell, a gourd, a rectangle.
In some embodiments, the orthographic projection of each second anode 152 on the substrate 180 is composed of one third pattern element or is composed of a concatenation of more than two third pattern elements, the third pattern elements comprising at least one selected from the group consisting of a circle, an ellipse, a dumbbell, a gourd, a rectangle.
The display panel 100, for example, further includes a pixel defining layer 160 on the device layer, and the pixel defining layer 160 is positioned under the first electron transport layer 131 and the second electron transport layer 132. The pixel defining layer 160 includes a first pixel opening 161 located in the first display area AA1 and a second pixel opening 162 located in the second display area AA 2.
The display panel 100 further includes, for example, a light emitting structure including a first light emitting structure located in the first display area AA1 and a second light emitting structure located in the second display area AA 2. The first and second light emitting structures may include OLED light emitting layers, respectively. The first light emitting structure includes, for example, the first electron transport layer 131 described above, and further includes, for example, at least one of an electron injection layer, a hole transport layer, and a hole injection layer according to design requirements. The second light emitting structure includes, for example, the second electron transport layer 132 described above, and the second light emitting structure further includes, for example, at least one of an electron injection layer, a hole transport layer, and a hole injection layer.
The first light emitting structure is located in the first pixel opening 161, and the second light emitting structure is located in the second pixel opening 162. The first pixel opening 161 is disposed corresponding to the first light emitting sub-pixel 191a, for example, and the first pixel opening 161 is disposed corresponding to the red, green, and blue sub-pixels, for example. The second pixel aperture 162 is disposed corresponding to the second light emitting sub-pixel 191a, for example, the second pixel aperture 162 is disposed corresponding to the red, green, and blue sub-pixels, for example.
In some embodiments, the orthographic projection of the first pixel opening 161 on the substrate 180 is composed of one second graphic element or is composed of a concatenation of two or more second graphic elements, the second graphic element comprising at least one selected from the group consisting of a circle, an ellipse, a dumbbell, a gourd, a rectangle.
In some alternative embodiments, the refractive index of the first cathode layer 111 is smaller than the refractive index of the first electron transport layer 131, and the refractive index of the first cathode layer 111 is smaller than the refractive index of the first light extraction layer 121. By reasonably adjusting the refractive indexes of the first cathode layer 111, the first electron transport layer 131, and the first light extraction layer 121 adjacent to each other in the stacking direction, the resonance structure of the first display area AA1 can be optimized, so that light is coherent and superimposed, the light emission amount is increased, the luminance of the first light-emitting sub-pixel 191a is further increased, the display effect of the first display area AA1 is improved, and the display boundary between the first display area AA1 and the second display area AA2 is weakened.
There are various ways of adjusting the refractive index of the first cathode layer 111, the first electron transport layer 131, and the first light extraction layer 121. Taking the first cathode layer 111 as an example, for example, different metals or other materials may be doped in the material of the first cathode layer 111 to adjust the refractive index of the first cathode layer 111 reasonably, or the refractive index of the first cathode layer 111 may be adjusted by adjusting the thickness of the first cathode layer 111 reasonably.
Further, the refractive index of the first electron transport layer 131 is smaller than the refractive index of the first light extraction layer 121. The resonance structure of the first display area AA1 can be further optimized, and the display effect of the first display area AA1 is improved.
As shown in fig. 3, in some alternative embodiments, in order to improve the light transmittance of the first display area AA1, the thickness of the first cathode layer 111 is smaller than that of the second cathode layer 112, so as to facilitate the integration of the under-screen photosensitive assembly 200.
Further preferably, a first thickness difference between the first cathode layer 111 and the second cathode layer 112 is equal to a second thickness difference between the first light extraction layer 121 and the second light extraction layer 122, and thicknesses of the first compensation layer and the second compensation layer are equal, so that a molding process of the display panel 100 can be simplified, and the molding of the display panel 100 is facilitated.
In some alternative embodiments, the first compensation layer further includes a first encapsulation layer 141 on the first light extraction layer 121, and the second compensation layer further includes a second encapsulation layer 142 on the second light extraction layer 122.
Further, the thickness of the first electron transport layer 131 is equal to the thickness of the second electron transport layer 132, so that the first electron transport layer 131 and the second electron transport layer 132 can be simultaneously formed by using the same process step, further simplifying the molding process of the display panel 100. The thickness of the first encapsulation layer 141 and the thickness of the second encapsulation layer 142 are equal, so that the first encapsulation layer 141 and the second encapsulation layer 142 can be simultaneously formed by using the same process steps, and the molding process of the display panel 100 is simplified.
In other alternative embodiments, as shown in fig. 4, the thickness of the first cathode layer 111 is equal to the thickness of the second cathode layer 112 in order to weaken the display boundary between the first display area AA1 and the second display area AA 2. Further, the thickness of the first cathode layer 111 and the thickness of the second cathode layer 112 are both less than or equal to
The first cathode layer 111 and the second cathode layer 112 are thinned, so that the thicknesses of the first cathode layer 111 and the second cathode layer 112 are smaller, the microcavity effect of the first display area AA1 and the microcavity effect of the second display area AA2 can be weakened at the same time, the influence of the cathode layers on the microcavity effect is reduced, and the display boundary between the first display area AA1 and the second display area AA2 is weakened.
In some alternative embodiments, the refractive index of the second cathode layer 112 is less than the refractive index of the second electron transport layer 132, and the refractive index of the second cathode layer 112 is less than the refractive index of the second light extraction layer 122. When the thickness of the second cathode layer 112 is too thin, so that the brightness of the second light emitting sub-pixel 191a is low, and the display effect of the second display area AA2 cannot meet the requirement, the resonance effect of the second display area AA2 can be optimized, the light emitting amount of the second display area AA2 can be increased, and the display effect of the second display area AA2 can be further increased by adjusting the refractive index of the second cathode layer 112, the refractive index of the second electron transport layer 132, and the refractive index of the second light extraction layer 122.
Further, the refractive index of the second electron transport layer 132 is smaller than that of the second light extraction layer 122. The display effect of the second display area AA2 can be further improved.
When the thickness of the first light extraction layer 121 is greater than that of the second light extraction layer 122 and the thickness of the first cathode layer 111 is equal to that of the second cathode layer 112, the thickness of the first compensation layer is smaller than that of the second compensation layer so that the sum of the thicknesses of the first compensation layer, the first cathode layer 111, and the first light extraction layer 121 is equal to that of the second compensation layer, the second cathode layer 112, and the second light extraction layer 122.
In some alternative embodiments, the thickness of the first encapsulation layer 141 is equal to the thickness of the second encapsulation layer 142, and the thickness of the first electron transport layer 131 is less than the thickness of the second electron transport layer 132. The thickness of the first encapsulation layer 141 is equal to the thickness of the second encapsulation layer 142, so that the first encapsulation layer 141 and the second encapsulation layer 142 can be synchronously formed in the same process step, the molding process of the display panel 100 is simplified, and the molding efficiency of the display panel 100 is improved.
In some alternative embodiments, in order to improve the display effect of the first display area AA1, the electron mobility of the first electron transport layer 131 is greater than or equal to 10 -6 cm 2 (iv) Vs. Experimentally determined when the electron mobility is greater than or equal to 10 -6 cm 2 /Vs, that is, when the electron mobility of the first electron transport layer 131 is high, the electron transport amount in the first electron transport layer 131 can be increased, and thus the brightness of the first light emitting sub-pixel 191a is increased, and the display effect of the first display area AA1 is improved. The material of the first electron transport layer 131 includes, for example, an azaaryl derivative or the like.
In some alternative embodiments, the display panel 100 further includes a hole transport layer 170 positioned under the electron transport layer 130. The hole transport layer 170 includes a first hole transport layer 171 positioned under the first electron transport layer 131 and a second hole transport layer 172 positioned under the second electron transport layer 132. That is, the first light emitting structure includes the first hole transporting layer 171, and the second light emitting structure includes the second hole transporting layer 172.
In some alternative embodiments, the first hole transport layer 171 has a hole mobility greater than or equal to 10 -6 cm 2 and/Vs, the mobility efficiency of the first hole transporting layer 171 can be improved, the luminance of the first light emitting sub-pixel 191a can be improved, and the display effect of the first display area AA1 can be improved.
The material of the first hole transport layer 171 includes, for example, at least one of an aromatic amine, a spirofluorene, or a carbazole, furan, or a thiophene substituent.
In some embodiments, the device layer further includes a first pixel circuit located in the first display area AA1, and the first pixel circuit is used for driving the first light-emitting sub-pixel 191a to display. The number of the first pixel circuits may be plural and respectively electrically connected to the corresponding first light emitting sub-pixels 191a.
In some embodiments, the circuit structure of the first pixel circuit is any one of a 2T1C circuit, a 7T2C circuit, or a 9T1C circuit. Herein, the "2T1C circuit" refers to a pixel circuit including 2 thin film transistors (T) and 1 capacitor (C) in the pixel circuit, and the other "7T1C circuit", "7T2C circuit", "9T1C circuit", and the like are analogized in turn.
In some embodiments, the display panel 100 may further include a second pixel circuit located in the second display area AA2, and the second pixel circuit is electrically connected to the second light emitting sub-pixel 191a for driving the second light emitting sub-pixel 191a130. The circuit structure of the second pixel circuit may be any one of a 2T1C circuit, a 7T2C circuit, or a 9T1C circuit.
In some embodiments, the size of the first light emitting sub-pixel 191a is smaller than the size of the second light emitting sub-pixel 191a of the same color, so that the area of the non-light emitting region in the first display region AA1 is larger, which is convenient for further improving the light transmittance of the first display region AA 1. It is understood that in other embodiments, the size of the first light emitting sub-pixel 191a is not limited thereto, and may be the same size as the second light emitting sub-pixel 191a of the same color, for example.
For example, the display panel 100 may further include a polarizer and a cover plate located above the encapsulation layer 140, or the cover plate may be directly disposed above the encapsulation layer 140, without disposing the polarizer, or at least the cover plate may be directly disposed above the encapsulation layer 140 of the first display area AA1 without disposing the polarizer, so as to avoid the polarizer from affecting the light collection amount of the light sensing assembly 200 disposed below the first display area AA1, and of course, the polarizer may also be disposed above the encapsulation layer 140 of the first display area AA 1.
An embodiment of the present invention further provides a display device, which may include the display panel 100 of any of the above embodiments. The following description will be given taking as an example a display device of an embodiment including the display panel 100 of the above-described embodiment.
Fig. 5 is a schematic top view illustrating a display device according to an embodiment of the present invention, and fig. 6 is a cross-sectional view taken along line B-B of fig. 5.
In the display device of this embodiment, the display panel 100 may be the display panel 100 of one of the above embodiments, the display panel 100 has a first display area AA1 and a second display area AA2, and the light transmittance of the first display area AA1 is greater than that of the second display area AA 2.
The display panel 100 includes a first surface S1 and a second surface S2 opposite to each other, wherein the first surface S1 is a display surface. The display device further includes a photosensitive element 200, wherein the photosensitive element 200 is located on the second surface S2 side of the display panel 100, and the photosensitive element 200 corresponds to the first display area AA 1.
The photosensitive assembly 200 may be an image capturing device for capturing external image information. In this embodiment, the photosensitive assembly 200 is a Complementary Metal Oxide Semiconductor (CMOS) image capture Device, and in other embodiments, the photosensitive assembly 200 may also be a Charge-coupled Device (CCD) image capture Device or other types of image capture devices.
The photosensitive assembly 200 may not be limited to an image capture device, for example, in some embodiments, the photosensitive assembly 200 may also be an infrared sensor, a proximity sensor, an infrared lens, a floodlight sensing element, an ambient light sensor, a dot matrix projector, and the like. In addition, the display device may further integrate other components, such as a receiver, a speaker, etc., on the second surface S2 of the display panel 100.
According to the display device of the embodiment of the invention, the light transmittance of the first display area AA1 is greater than that of the second display area AA2, so that the display panel 100 can integrate the photosensitive component 200 on the back of the first display area AA1, for example, the under-screen integration of the photosensitive component 200 of the image acquisition device is realized, and meanwhile, the first display area AA1 can display a picture, so that the display area of the display panel 100 is increased, and the comprehensive screen design of the display device is realized.
In accordance with the above-described embodiments of the present invention, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.
Claims (25)
1. A display panel having a first display region and a second display region, the first display region having a light transmittance greater than that of the second display region, the display panel comprising:
a cathode layer including a first cathode layer positioned at the first display area and a second cathode layer positioned at the second display area;
a light extraction layer on the cathode layer, the light extraction layer including a first light extraction layer in the first display region and a second light extraction layer in the second display region;
a compensation layer including a first compensation layer located at the first display region and a second compensation layer located at the second display region, the first compensation layer including a first electron transport layer located under the first cathode layer, the second compensation layer including a second electron transport layer located under the second cathode layer;
wherein a sum of thicknesses of the first compensation layer, the first cathode layer, and the first light extraction layer is equal to a sum of thicknesses of the second compensation layer, the second cathode layer, and the second light extraction layer, and a thickness of the first light extraction layer is greater than a thickness of the second light extraction layer.
2. The display panel according to claim 1,
the refractive index of the first cathode layer is less than the refractive index of the first electron transport layer, and the refractive index of the first cathode layer is less than the refractive index of the first light extraction layer.
3. The display panel according to claim 2, wherein a refractive index of the first electron transport layer is smaller than a refractive index of the first light extraction layer.
4. The display panel according to claim 1,
the first compensation layer further includes a first encapsulation layer on the first light extraction layer, and the second compensation layer further includes a second encapsulation layer on the second light extraction layer.
5. The display panel of claim 4, wherein the thickness of the first cathode layer is less than the thickness of the second cathode layer.
6. The display panel according to claim 5, wherein the thickness of the first compensation layer is equal to the thickness of the second compensation layer.
7. The display panel of claim 5, wherein the first electron transport layer has a thickness equal to a thickness of the second electron transport layer, and wherein the first encapsulation layer has a thickness equal to a thickness of the second encapsulation layer.
8. The display panel of claim 4, wherein the thickness of the first cathode layer is equal to the thickness of the second cathode layer, and wherein the thickness of the first cathode layer and the thickness of the second cathode layer are both less than or equal to 120A.
9. The display panel according to claim 8, wherein a refractive index of the second cathode layer is smaller than a refractive index of the second electron transport layer, and a refractive index of the second cathode layer is smaller than a refractive index of the second light extraction layer.
10. The display panel according to claim 9, wherein a refractive index of the second electron transport layer is smaller than a refractive index of the second light extraction layer.
11. The display panel according to claim 8,
the thickness of the first compensation layer is smaller than that of the second compensation layer.
12. The display panel of claim 11, wherein the first encapsulating layer has a thickness equal to a thickness of the second encapsulating layer, and wherein the first electron transport layer has a thickness less than a thickness of the second electron transport layer.
13. The display panel according to claim 1, further comprising:
a substrate;
a driving device layer on the substrate, the device layer including a first anode electrode in the first display region and a second anode electrode in the second display region;
and the pixel definition layer is positioned on the device layer and is positioned below the first electron transmission layer and the second electron transmission layer, and the pixel definition layer comprises a first pixel opening positioned in the first display area and a second pixel opening positioned in the second display area.
14. The display panel of claim 13, wherein an area of an orthographic projection of the first anode on the substrate is smaller than an area of an orthographic projection of the second anode on the substrate.
15. The display panel of claim 13, wherein the orthographic projection of the first anode on the substrate is composed of one first graphic element or is composed of a concatenation of more than two first graphic elements, the first graphic element comprising at least one selected from the group consisting of a circle, an ellipse, a dumbbell, a gourd, and a rectangle.
16. The display panel of claim 13, wherein the orthographic projection of the first pixel opening on the substrate is composed of one second graphic element or is composed of a concatenation of two or more second graphic elements, the second graphic element comprising at least one selected from the group consisting of a circle, an ellipse, a dumbbell, a gourd, and a rectangle.
17. The display panel according to claim 13, wherein the first anode is a light-transmitting electrode.
18. The display panel according to claim 13, wherein the first anode is a reflective electrode.
19. The display panel according to claim 13, wherein the first anode comprises an indium tin oxide layer or an indium zinc oxide layer.
20. The display panel of claim 13 wherein the first cathode layer comprises a layer of magnesium silver alloy.
21. The display panel according to claim 1, wherein the first electron transport layer has an electron mobility of 10 or more -6 cm 2 /Vs。
22. The display panel of claim 21, wherein the material of the first electron transport layer comprises a nitrogen heteroaryl derivative.
23. The display panel according to claim 1, wherein the display panel further comprises a hole transport layer comprising a first hole transport layer under the first electron transport layer, the first hole transport layer having a hole mobility of 10 or more -6 cm 2 /Vs。
24. The display panel of claim 23, wherein the material of the first hole transport layer comprises at least one aromatic amine, spirofluorene, or carbazole, furan, thiophene substituent.
25. A display device characterized by comprising the display panel according to any one of claims 1 to 24.
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| CN111864106B (en) * | 2020-07-10 | 2021-06-22 | 武汉华星光电半导体显示技术有限公司 | Display panel, manufacturing method of display panel and display device |
| CN112102783B (en) | 2020-11-05 | 2021-02-02 | 武汉华星光电半导体显示技术有限公司 | Display device and electronic apparatus |
| CN112885976B (en) * | 2021-01-19 | 2024-03-12 | 京东方科技集团股份有限公司 | Display substrate, display device and mask |
| CN114203785B (en) * | 2021-12-10 | 2023-05-09 | 武汉华星光电半导体显示技术有限公司 | OLED display panel |
| CN114256437B (en) * | 2021-12-21 | 2023-07-18 | 合肥维信诺科技有限公司 | OLED display panel and display device |
| CN114520300B (en) * | 2022-01-05 | 2023-06-27 | 武汉华星光电半导体显示技术有限公司 | Display panel and display device |
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| CN110783485A (en) * | 2019-09-24 | 2020-02-11 | 昆山国显光电有限公司 | Light-transmitting display panel, manufacturing method and display device |
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| CN207947277U (en) * | 2018-04-02 | 2018-10-09 | 云谷（固安）科技有限公司 | A kind of top light emitting display panel and display device |
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