CN113013216B - Display panel, display device and preparation method of display panel - Google Patents
Display panel, display device and preparation method of display panel Download PDFInfo
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- CN113013216B CN113013216B CN202110223683.7A CN202110223683A CN113013216B CN 113013216 B CN113013216 B CN 113013216B CN 202110223683 A CN202110223683 A CN 202110223683A CN 113013216 B CN113013216 B CN 113013216B
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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
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
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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
- H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
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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
- H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
- H10K59/65—OLEDs integrated with inorganic image sensors
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- H—ELECTRICITY
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- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
Abstract
The embodiment of the invention provides a display panel, a display device and a preparation method of the display panel, wherein the display panel comprises a substrate; the light-emitting layer comprises a plurality of display light-emitting units and function light-emitting units which are distributed in an array manner, and the plurality of function light-emitting units are distributed among the plurality of display light-emitting units at intervals; the light conversion layer is arranged on one side, away from the substrate, of the light emitting layer and comprises a plurality of light conversion units distributed at intervals, orthographic projections of the functional light emitting units on the substrate are respectively located in the orthographic projections of the light conversion units on the substrate, and the light conversion units are used for converting visible light emitted by the functional light emitting units into infrared light. The embodiment of the invention has the display light-emitting units and the function light-emitting units with different functions, and can improve the phenomenon that the display panel has uneven color development due to the influence of display and function multiplexing on the service life of part of the light-emitting units.
Description
Technical Field
The invention relates to the technical field of display equipment, in particular to a display panel, a display device and a preparation method of the display panel.
Background
Flat Display panels such as Organic Light Emitting Diode (OLED) Display panels and Display panels using LED devices have the advantages of high image quality, power saving, thin body, and wide application range, and thus are widely used in various consumer electronic products such as mobile phones, televisions, personal digital assistants, digital cameras, notebook computers, and desktop computers, and become the mainstream of Display devices.
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 slot (Notch) or an opening can be formed in a display screen, and external light can enter a photosensitive element located below the screen through the slot or the opening in the screen. The electronic product adopting the display panel comprises a first display area and a second display area. The first display area is a photosensitive functional area, and may be, for example, an off-screen image pickup area, an off-screen fingerprint recognition area, or the like. However, the first display area and the second display area of the display panel have different brightness, which causes the display panel to have uneven brightness.
Disclosure of Invention
The embodiment of the invention provides a display panel, a display device and a preparation method of the display panel, which are used for improving uneven color development of the display panel.
An embodiment of a first aspect of the invention provides a display panel comprising a substrate; the light-emitting layer comprises a plurality of display light-emitting units and function light-emitting units which are distributed in an array manner, and the plurality of function light-emitting units are distributed among the plurality of display light-emitting units at intervals; the light conversion layer is arranged on one side, away from the substrate, of the light emitting layer and comprises a plurality of light conversion units distributed at intervals, orthographic projections of the functional light emitting units on the substrate are respectively located in the orthographic projections of the light conversion units on the substrate, and the light conversion units are used for converting visible light emitted by the functional light emitting units into infrared light.
According to an embodiment of the first aspect of the present invention, the light emitting layer further includes a plurality of first electrodes spaced apart from each other, and each of the first electrodes is located on a side of each of the functional light emitting units facing the substrate;
the light-emitting layer further comprises a plurality of second electrodes distributed at intervals, each second electrode is located on one side, facing the substrate, of each display light-emitting unit, and the orthographic projection of each second electrode on the substrate is larger than that of each first electrode.
According to any one of the preceding embodiments of the first aspect of the invention, the light-emitting layer further comprises a third electrode, the third electrode being located on a side of the display light-emitting units and the functional light-emitting units facing away from the substrate, the third electrode being a common electrode.
According to any one of the preceding embodiments of the first aspect of the invention, further comprising: and the light conversion layer is arranged on one side of the light-emitting layer, which is deviated from the substrate.
According to any one of the embodiments of the first aspect of the present invention, the light extraction layer is provided with a functional opening, so that the functional light emitting unit is exposed from the functional opening, and an orthographic projection of the light conversion unit on the light extraction layer is located within the functional opening.
According to any of the preceding embodiments of the first aspect of the invention, the light conversion unit is located within the functional opening;
or the display panel further comprises an encapsulation layer, the encapsulation layer is positioned on one side of the light extraction layer, which is far away from the light emitting layer, the light conversion layer is positioned on the surface of the encapsulation layer, which is far away from the light extraction layer, and the plurality of light conversion units are distributed on the surface of the encapsulation layer, which is far away from the light extraction layer, at intervals.
According to any one of the preceding embodiments of the first aspect of the present invention, the display light-emitting unit comprises a first color light-emitting unit, a second color light-emitting unit and a third color light-emitting unit, the first color light-emitting unit, the second color light-emitting unit and the third color light-emitting unit form one display unit, one or more display units and one functional light-emitting unit form one repeating unit, and a plurality of repeating units are distributed in an array on the substrate.
According to any one of the preceding embodiments of the first aspect of the invention, the plurality of display units and the one functional light-emitting unit form a repeating unit.
According to any one of the preceding embodiments of the first aspect of the present invention, the functional light emitting unit comprises a red functional unit for emitting red light, a green functional unit for emitting green light and a blue functional unit for emitting blue light;
the conversion unit comprises a first conversion unit for converting red light into infrared light, a second conversion unit for converting green light into infrared light and a third conversion unit for converting blue light into infrared light, wherein the orthographic projection of the first conversion unit on the substrate is at least partially overlapped with the orthographic projection of the red functional unit on the substrate, the orthographic projection of the second conversion unit on the substrate is at least partially overlapped with the orthographic projection of the green functional unit on the substrate, and the orthographic projection of the third conversion unit on the substrate is at least partially overlapped with the orthographic projection of the blue functional unit on the substrate.
According to any one of the preceding embodiments of the first aspect of the present invention, the display panel has a functional area, the plurality of functional light-emitting units are distributed at intervals in the functional area, and the display panel further includes a functional sensor, and the functional sensor is located in the functional area.
According to any one of the preceding embodiments of the first aspect of the invention, the orthographic projection of the one or more functional light-emitting units on the substrate is located within the orthographic projection of the functional sensor on the substrate.
Embodiments of the second aspect of the present invention further provide a display device, including the display panel of any one of the embodiments of the first aspect.
Embodiments of the third aspect of the present invention further provide a method for manufacturing a display panel, including:
providing a substrate;
forming a light-emitting layer on a substrate, wherein the light-emitting layer comprises a plurality of display light-emitting units and functional light-emitting units which are arranged on the same layer and distributed in an array manner, and the plurality of functional light-emitting units are distributed among the plurality of display light-emitting units at intervals;
and forming a light conversion layer on the side of the light emitting layer, which is far away from the substrate, wherein the light conversion layer comprises a plurality of light conversion units distributed at intervals, the orthographic projection of each functional light emitting unit on the substrate is respectively positioned in the orthographic projection of each light conversion unit on the substrate, and the light conversion units are used for converting the visible light emitted by the functional light emitting units into infrared light.
According to an embodiment of the third aspect of the present invention, before the step of forming the light conversion layer on the side of the light emitting layer facing away from the substrate, the method further comprises:
a light extraction layer is formed on the side of the light-emitting layer facing away from the substrate.
According to any one of the foregoing embodiments of the third aspect of the present invention, in the step of forming the light extraction layer on the side of the light-emitting layer facing away from the substrate, the light extraction layer includes a plurality of functional openings so that the functional light-emitting units are exposed from the functional openings;
in the step of forming a light-converting layer on the side of the light-emitting layer facing away from the substrate: a light conversion unit is formed within the functional opening.
According to a third aspect of the present invention, in the step of forming the light conversion layer on the side of the light emitting layer away from the substrate, an evaporation process is selected to form the light conversion unit in the functional opening.
According to an embodiment of the third aspect of the present invention, before the step of forming the light conversion layer on the side of the light emitting layer facing away from the substrate, the method further comprises:
forming an encapsulation layer on one side of the light-emitting layer, which is far away from the substrate;
in the step of forming the light conversion layer on the side of the light emitting layer facing away from the substrate, the light conversion layer is formed on the surface of the encapsulation layer facing away from the substrate.
According to any one of the preceding embodiments of the third aspect of the invention, in the step of forming the light conversion layer on the surface of the encapsulation layer facing away from the substrate: and forming the light conversion layer on the surface of the packaging layer, which is far away from the substrate, by adopting a laser etching, ink-jet printing or evaporation process.
In the display panel provided by the embodiment of the invention, the light-emitting layer arranged on the substrate comprises both the display single light unit and the functional light-emitting unit. The display lighting unit can be used for display of the display panel, and the functional lighting unit is used for implementing a part of functions of the display panel, for example, the functional lighting unit is used for implementing a fingerprint recognition function. The embodiment of the invention has the display light-emitting units and the function light-emitting units with different functions, and can improve the phenomenon that the display panel has uneven color development due to the influence of display and function multiplexing on the service life of part of the light-emitting units. In addition, display panel still including being used for converting the light conversion layer of visible light conversion infrared light, function luminescence unit and display luminescence unit set up in same layer, need not to set up extra infrared light emitting module, can reduce display panel thickness.
Drawings
Other features, objects and advantages of the invention will become apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings in which like or similar reference characters refer to the same or similar parts.
Fig. 1 is a top view of a display panel according to an embodiment of the present invention;
fig. 2 is a partially enlarged view of a portion of the first display area AA1 of a display panel according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view taken at A-A of FIG. 2;
FIG. 4 is a cross-sectional view taken at A-A of FIG. 2 in another embodiment;
FIG. 5 is a cross-sectional view taken at A-A of FIG. 2 in a further embodiment;
FIG. 6 is a cross-sectional view taken at A-A of FIG. 2 in a further embodiment;
FIG. 7 is a schematic flow chart of a method for manufacturing a display panel according to an embodiment of the third aspect of the present invention;
FIG. 8 is a schematic flow chart of a method for manufacturing a display panel according to another embodiment of the third aspect of the present invention;
fig. 9 is a schematic flow chart of a manufacturing method of a display panel according to still another embodiment of the third aspect of the present invention.
Description of the reference numerals:
10. a display panel;
100. a substrate; 110. an array substrate; 111. a thin film transistor;
200. a light emitting layer; 210. a display light emitting unit; 220. a functional light emitting unit; 230. a first electrode; 240. a second electrode; 250. a third electrode; 260. a pixel defining layer;
300. a light conversion unit;
400. a functional sensor;
500. a light extraction layer;
600. a packaging layer;
AA1, first display area; AA2, second display area; NA, non-display area.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, 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. In the drawings and the following description, at least some well-known structures and techniques have not been shown to avoid unnecessarily obscuring the present invention; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, as used herein, refer to orientations or positional relationships and are used merely to facilitate description of the invention and to simplify the description, but do not indicate or imply that the device or element so referred to must be oriented, constructed, and operated in a particular orientation and therefore should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The directional terms appearing in the following description are intended to be illustrative in all directions, and are not intended to limit the specific construction of embodiments of the present invention. In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as either a fixed connection, a removable connection, or an integral connection; can be directly connected or indirectly connected. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
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.
For example, the display panel can effectively improve the screen occupation ratio and the appearance industrial design by placing the image sensor for optical fingerprint identification on the back of the display area. In order to realize fingerprint identification under the screen, the light transmittance of the display panel needs to be ensured. At present, the method of instantaneous highlight of a display panel is adopted to ensure the intensity of fingerprint reflected light so as to realize the image acquisition of optical fingerprint identification. The inventor finds that part of the sub-pixels of the display panel are used for normal display of the display panel and are multiplexed as a light source for fingerprint identification, which seriously affects the service life of the part of the sub-pixels and may cause the risk of local screen burn-in.
The present invention is proposed to solve the above-mentioned technical problems. For better understanding of the present invention, the display panel, the display device and the method for manufacturing the display panel according to the embodiment of the present invention are described in detail below with reference to fig. 1 to 9.
Fig. 1 is a schematic top view of a display panel 10 according to an embodiment of the present invention.
As shown in fig. 1, the display panel 10 has a first display area AA1, a second display area AA2, and a non-display area NA surrounding the first display area AA1 and the second display area AA 2. The first display area AA1 is a function display area for implementing functions such as fingerprint recognition. The second display area AA2 is a normal display area.
In other alternative embodiments, the display panel 10 may not include the non-display area NA.
In still other alternative embodiments, the first display area AA1 and the second display area AA2 are overlapped, that is, all screens of the display panel 10 are both functional display areas, for example, all screens of the display panel 10 are both fingerprint identification areas, so that full-screen large-area fingerprint identification can be realized.
The function Display area may be, for example, an under-screen image capture area or a Fingerprint identification (FOD) area. In an embodiment where the first display area AA1 is a fingerprint identification area, the user may place a finger on the display panel 10 opposite to the first display area AA1 to capture the finger fingerprint and complete an operation instruction such as unlocking.
Referring to fig. 2 and 3 together, fig. 2 is a partially enlarged view of a portion of the first display area AA1 in fig. 1, and fig. 3 is a cross-sectional view taken along line a-a in fig. 2.
As shown in fig. 2 and fig. 3, in the display panel 10 provided by the embodiment of the first aspect of the present invention, the display panel 10 includes a substrate 100; the light emitting layer 200 includes a plurality of display light emitting units 210 and functional light emitting units 220 distributed in an array, and the functional light emitting units 220 are distributed among the display light emitting units 210 at intervals; and a light conversion layer disposed on a side of the light emitting layer 200 away from the substrate 100, wherein the light conversion layer includes a plurality of light conversion units 300 distributed at intervals, orthographic projections of the functional light emitting units 220 on the substrate 100 are respectively located within orthographic projections of the light conversion units 300 on the substrate 100, and the light conversion units 300 are used for converting visible light emitted by the functional light emitting units 220 into infrared light.
In the display panel 10 provided by the embodiment of the invention, the light emitting layer 200 disposed on the substrate 100 includes both the display single light unit and the functional light emitting unit 220. The display light-emitting unit 210 can be used for display of the display panel 10, and the functional light-emitting unit 220 is used for implementing a part of functions of the display panel 10, for example, the functional light-emitting unit 220 is used for implementing a fingerprint recognition function. The embodiment of the invention has the display light-emitting unit 210 and the functional light-emitting unit 220 with different functions, and can improve the phenomenon that the display panel 10 has uneven color development due to the influence of display and function multiplexing on the service life of part of the light-emitting units.
In addition, the display panel 10 further includes a light conversion layer for converting visible light into infrared light, the functional light emitting unit 220 and the display light emitting unit 210 are disposed on the same layer, an additional infrared light emitting module is not required, the visible light emitted by the functional light emitting unit 22 can be converted into infrared light by adding the light conversion layer, and the thickness of the display panel 10 can be reduced.
The plurality of functional light emitting units 220 are distributed among the plurality of display light emitting units 210 at intervals, which means that: the plurality of functional light emitting units 220 are distributed at intervals, and each functional light emitting unit 220 is respectively located between different ones of the plurality of display light emitting units 210. For example, one of the functional light-emitting units 220 is located between one of the groups of the display light-emitting units 210, and the other functional light-emitting units 220 are located between the other display light-emitting units 210, so that the distance between the functional light-emitting units 220 is increased, the functional light-emitting units 220 are arranged in a more distributed manner, and the influence of the functional light-emitting units 220 on the display effect of the display panel 10 is improved.
Optionally, the display light-emitting unit 210 includes a first color light-emitting unit, a second color light-emitting unit, and a third color light-emitting unit, where the first color light-emitting unit, the second color light-emitting unit, and the third color light-emitting unit form a display unit, one or more display units and one functional light-emitting unit 220 form a repeating unit, and the plurality of repeating units are distributed in an array on the substrate. The first color light emitting unit is, for example, a red light emitting unit, the second color light emitting unit is, for example, a blue light emitting unit, and the third color light emitting unit is, for example, a green light emitting unit.
In these alternative embodiments, the first color light emitting unit, the second color light emitting unit, and the third color light emitting unit form one display unit, i.e., the light emitting units of different colors form one display unit emitting white light. One or more display units and one functional light-emitting unit 220 form a repeating unit, which can improve the influence of the functional light-emitting unit 220 on the display effect of the display panel 10.
Alternatively, a plurality of display units and one functional light emitting unit 220 form a repeating unit. The influence of the functional light emitting unit 220 on the display effect of the display panel 10 can be further reduced.
The light conversion unit 300 may be disposed in various ways as long as the light conversion unit 300 can convert visible light emitted from the function display unit 220 into infrared light. For example, the material of the conversion unit 300 comprises a down-conversion luminescent material doped with a rare earth element. The rare earth elements comprise one or more of erbium, ytterbium, praseodymium, terbium and thulium.
There are various ways of setting the emission color of the functional display unit 220, for example, the functional display unit 220 may emit red light, green light, or blue light. The corresponding light conversion units 300 may convert red light, green light, and blue light into infrared light.
Optionally, the functional display unit 220 includes a red functional unit, a green functional unit, and a blue functional unit, where the red functional unit is configured to emit red light, the green functional unit is configured to emit green light, the blue functional unit is configured to emit blue light, and the numbers of the red functional unit, the green functional unit, and the blue functional unit are equal to improve an influence of the functional display unit 220 on a display color shift of the display panel.
Optionally, the light conversion unit 300 includes a first conversion unit, a second conversion unit and a third conversion unit, the first conversion unit is configured to convert red light into infrared light, the second conversion unit is configured to convert green light into infrared light, and the third conversion unit is configured to convert blue light into infrared light. The orthographic projection of the first conversion unit on the substrate and the orthographic projection of the red functional unit on the substrate are at least partially overlapped, the orthographic projection of the second conversion unit on the substrate and the orthographic projection of the green functional unit on the substrate are at least partially overlapped, and the orthographic projection of the third conversion unit on the substrate and the orthographic projection of the blue functional unit on the substrate are at least partially overlapped.
Optionally, the display panel 10 further includes a function sensor 400. There are various positions where the functional sensor 400 is disposed, for example, the functional sensor 400 may be disposed between the substrate 100 and the light emitting layer 200, or the functional sensor 400 may be disposed on a side of the substrate 100 facing away from the light emitting layer 200. There are various ways of disposing the function sensor 400, and the function sensor 400 will be described as a fingerprint recognition sensor.
Illustratively, the substrate 100 may be a flexible substrate 100 or a rigid substrate 100. For example, the substrate 100 may be made of a light-transmitting material such as glass or Polyimide (PI).
Optionally, the display panel 10 further includes an array substrate 110, the array substrate 110 is located between the light emitting layer 200 and the substrate 100, and the array substrate 110 includes a device layer. The device layer may include a plurality of transistors. The transistors constitute a pixel circuit for controlling the display light emitting unit 210 and the functional light emitting unit 220 in the light emitting layer 200 to emit light. The connections between the transistors and the light emitting layer 200 are only schematic.
The light emitting layer 200 may further include a pixel defining layer 260, and the pixel defining layer 260 includes an isolation structure and a pixel opening surrounded by the isolation structure. The number of the pixel openings is plural, and each display light emitting unit 210 and each functional light emitting unit are respectively located in each pixel opening.
The display light emitting unit 210 may include a red light emitting unit, a blue light emitting unit, and a green light emitting unit, thereby implementing a color display.
The functional light-emitting unit may also include a red light-emitting unit, a blue light-emitting unit, and a green light-emitting unit. To improve the effect of the functional light-emitting unit 220 on the display of the display panel 10. Alternatively, in the normal display state, the functional light emitting unit 220 may not emit light.
In some alternative embodiments, the light emitting layer 200 further includes a plurality of first electrodes 230 spaced apart from each other, and each first electrode 230 is located on a side of each functional light emitting unit 220 facing the substrate 100. Alternatively, each of the first electrodes 230 is disposed corresponding to each of the pixel openings.
Alternatively, the first electrode 230 may also be a reflective electrode.
In other alternative embodiments, the light emitting layer 200 further includes a plurality of second electrodes 240 distributed at intervals, each of the second electrodes 240 is located on a side of each of the display light emitting units 210 facing the substrate 100, and an orthogonal projection of the second electrode 240 on the substrate 100 is larger than an orthogonal projection of the first electrode 230 on the substrate 100.
In these alternative embodiments, the orthographic projection of the second electrode 240 on the substrate 100 is larger than the orthographic projection of the first electrode 230 on the substrate 100, that is, the size of the first electrode 230 is smaller, which can further improve the light transmittance of the display panel 10 in the area where the first electrode 230 is located, and ensure that enough light information passes through the first electrode 230 and is recognized by the fingerprint recognition sensor.
Alternatively, the first electrode 230 may be made of the same material as the second electrode 240. For example, the first electrode 230 and the second electrode 240 are both reflective electrodes, and the first electrode 230 and the second electrode 240 both include a magnesium silver alloy layer.
In some alternative embodiments, the light transmittance of the first display area AA1 may also be increased by increasing the spacing between the display light emitting units 210 in the first display area AA 1.
Optionally, the light emitting layer 200 further includes a third electrode 250, the third electrode 250 is located on a side of the display light emitting unit 210 and the functional light emitting unit 220 facing away from the substrate 100, and the third electrode 250 is a common electrode. The third electrode 250 and the first electrode 230 cooperate with each other to realize light emission of the functional light emitting unit 220, and the cooperation of the third electrode 250 and the second electrode 240 realizes light emission of display light emission. The third electrode 250 includes, for example, a magnesium silver alloy layer, so that the third electrode 250 has good conductivity.
Optionally, the display panel 10 further includes a light extraction layer 500 on a side of the light emitting layer 200 facing away from the substrate 100; an encapsulation layer 600 on a side of the light extraction layer 500 facing away from the substrate 100. There are various positions for disposing the light conversion layer, and the light conversion layer is located at a side of the encapsulation layer 600 facing or departing from the light extraction layer 500.
As shown in fig. 3, in some alternative embodiments, the light extraction layer 500 is an integrated whole-layer structure layer, and the light conversion layer may also be disposed on a surface of the light extraction layer 500 facing away from the light emitting layer 200. In the process of manufacturing the display panel 10, the light conversion unit 300 may be directly formed on the light extraction layer 500 without performing a patterning process on the light extraction layer 500, which may simplify the manufacturing method of the display panel 10 and improve the manufacturing efficiency of the display panel 10.
Referring to fig. 4, fig. 4 is a cross-sectional view taken along line a-a of fig. 2 according to another embodiment. In other alternative embodiments, as shown in fig. 4, the light conversion layer is located on the surface of the encapsulation layer 600 facing away from the light extraction layer 500, and the plurality of light conversion units 300 are spaced apart on the surface of the encapsulation layer 600 facing away from the light extraction layer 500.
In these alternative embodiments, a light conversion layer may be formed on the encapsulation layer 600 to prevent the light conversion layer from affecting the normal operation of the light emitting layer 200. In addition, when the light conversion layer is disposed on the package layer 600, the light conversion layer may be formed on the package layer 600 by using laser etching, chemical etching, inkjet printing, vapor deposition, or other processes.
Referring to FIG. 5, FIG. 5 is a cross-sectional view taken along line A-A of FIG. 2 in accordance with yet another embodiment.
As shown in fig. 5, in some alternative embodiments, the light extraction layer 500 is provided with a functional opening disposed therethrough, so that the functional light emitting unit 220 is exposed from the functional opening, and the orthographic projection of the light conversion unit 300 on the light extraction layer 500 is located within the functional opening.
In these alternative embodiments, since the light extraction layer 500 is provided with the functional opening, the functional light emitting unit 220 is exposed from the functional opening, so that the light extraction layer 500 does not shield the light emitted by the functional light emitting unit 220, and the light transmittance of the area where the functional light emitting unit 220 is located can be improved.
As shown in fig. 5, in some alternative embodiments, the light conversion layer is located on a side of the encapsulation layer 600 facing the light extraction layer 500, the light extraction layer 500 includes a plurality of functional openings such that the functional light emitting units 220 are exposed from the functional openings, and the light conversion units 300 are located in the functional openings.
In these alternative embodiments, the light extraction layer 500 is provided with a functional opening corresponding to the functional light emitting unit 220, so that the light extraction layer 500 does not affect the light emitted from the functional light emitting unit 220. The light conversion unit 300 is located in the functional opening, and can perform a light conversion function without increasing the thickness of the display panel 10 due to the provision of the light conversion layer.
Referring to fig. 6, fig. 6 is a cross-sectional view taken along line a-a of fig. 2 in yet another embodiment.
Optionally, when the light conversion layer is located on the surface of the encapsulation layer 600 away from the light extraction layer 500, a functional opening may be provided on the light extraction layer 500 at a position corresponding to the light conversion unit, and the orthographic projection of the light conversion unit 300 on the light extraction layer 500 is located in the functional opening, so that the light extraction layer 500 does not block the functional display unit.
In some alternative implementations, the plurality of function light units 220 are spaced apart in the first display area AA1, and the function sensor 400 is located in the first display area AA 1. That is, the plurality of functional light emitting units 220 are spaced apart within the functional area where the functional sensor 400 is located.
In these alternative embodiments, the functional light-emitting unit 220 and the functional sensor 400 are both located in the first display area AA1, which can increase the amount of light collected by the functional sensor 400.
Optionally, the orthographic projection of the one or more functional light emitting units 220 on the substrate 100 is located within the orthographic projection of the functional sensor 400 on the substrate 100. The amount of light collected by the functional sensor 400 can be further increased.
For example, the display panel 10 may further include a polarizer and a cover plate located above the encapsulation layer 600, or the cover plate may be directly disposed above the encapsulation layer 600, without a polarizer, or at least the cover plate may be directly disposed above the encapsulation layer 600 of the first display area AA1, without a polarizer, so as to avoid the polarizer from affecting the light collection amount of the functional sensor 400 disposed below the first display area AA1, and of course, a polarizer may also be disposed above the encapsulation layer 600 of the first display area AA 1.
Or, a polarizer may be disposed on a side of the light conversion layer away from the encapsulation layer 600, where the polarizer includes a through-hole portion, and the orthographic projection of the functional display unit on the polarizer is located in the through-hole portion, so as to avoid the polarizer from affecting the light collection amount of the functional sensor 400 disposed below the first display area AA 1.
A second aspect of the present invention also provides a display device comprising the display panel 10 of any one of the first aspects. Since the display device of the embodiment of the invention includes the display panel 10, the display device of the embodiment of the invention has the beneficial effects of the display panel 10, and the description thereof is omitted.
The display device in the embodiment of the present invention includes, but is not limited to, a mobile phone, a Personal Digital Assistant (PDA), a tablet computer, an electronic book, a television, a door lock, a smart phone, a console, and other devices having a display function.
Referring to fig. 7, fig. 7 is a schematic flow chart illustrating a manufacturing method of a display panel 10 according to a third embodiment of the present invention.
As shown in fig. 7, the third aspect of the present invention further provides a method for manufacturing a display panel 10, where the display panel 10 may be the display panel 10 provided in any one of the embodiments of the first aspect. The manufacturing method of the display panel 10 includes:
step S01: a substrate 100 is provided.
Step S02: the light emitting layer 200 is formed on the substrate 100, and the light emitting layer 200 includes a plurality of display light emitting units 210 and a plurality of functional light emitting units 220 distributed in an array at the same layer, and the plurality of functional light emitting units 220 are distributed among the plurality of display light emitting units 210 at intervals.
Optionally, before step S02, an array substrate 110 may be further formed on the substrate 100, where the array substrate 110 includes devices such as thin film transistors 111. Then, in step S02, a pixel defining layer 260 is formed on a side of the array substrate 110 facing away from the substrate 100, the pixel defining layer 260 includes an isolation structure and a pixel opening surrounded by the isolation structure, and the functional light emitting unit 220 and the display light emitting unit 210 are located in the pixel opening.
Step S03: a light conversion layer is formed on the side of the light emitting layer 200 facing away from the substrate 100, the light conversion layer includes a plurality of light conversion units 300 distributed at intervals, the orthographic projection of each functional light emitting unit 220 on the substrate 100 is respectively located within the orthographic projection of each light conversion unit 300 on the substrate 100, and the light conversion units 300 are used for converting the visible light emitted by the functional light emitting units 220 into infrared light.
According to the display panel 10 prepared by the preparation method of the display panel 10 provided by the embodiment of the invention, the luminescent layer 200 arranged on the substrate 100 comprises both the display single light unit and the functional luminescent unit 220. The display light emitting unit 210 can be used for display of the display panel 10, and the function light emitting unit 220 is used for implementing a part of functions of the display panel 10, for example, the function light emitting unit 220 is used for implementing a fingerprint recognition function. The embodiment of the invention has the display light-emitting unit 210 and the functional light-emitting unit 220 with different functions, and can improve the phenomenon that the display panel 10 has uneven color development due to the influence of display and function multiplexing on the service life of part of the light-emitting units. In addition, the display panel 10 further includes a light conversion layer for converting visible light into infrared light, and the functional light emitting unit 220 and the display light emitting unit 210 are disposed on the same layer, so that an additional infrared light emitting module is not required, and the thickness of the display panel 10 can be reduced.
Optionally, the display panel 10 may further include a light extraction layer 500 and an encapsulation layer 600, the light extraction layer 500 is located on a side of the light-emitting layer 200 facing away from the substrate 100, and the encapsulation layer 600 is located on a side of the light extraction layer 500 facing away from the substrate 100.
Referring to fig. 8, fig. 8 is a schematic flow chart illustrating a manufacturing method of a display panel 10 according to another embodiment of the third aspect of the present invention. Before step S03, the method for manufacturing the display panel 10 further includes:
step S021: a light extraction layer 500 is formed at the side of the light emitting layer 200 facing away from the substrate 100.
Alternatively, in the step of forming the light extraction layer 500 on the side of the light emitting layer 200 facing away from the substrate 100, the light extraction layer 500 includes a plurality of functional openings such that the functional light emitting units 220 are exposed by the functional openings.
The light conversion unit 300 may be formed within the functional opening in step S03. This enables the function of light conversion without increasing the thickness of the display panel 10.
For example, an evaporation process may be selected to form the light conversion unit 300 in the functional opening. In the preparation process of the display panel 10, when the light extraction layer 500 is prepared and is not moved out of the evaporation chamber, the light conversion unit 300 may be continuously formed by using an evaporation process, which can simplify the preparation process of the display panel 10 and improve the preparation efficiency of the display panel 10.
Referring to fig. 9, fig. 9 is a schematic flow chart illustrating a manufacturing method of a display panel 10 according to yet another embodiment of the third aspect of the present invention. In further alternative embodiments, the step of forming a light conversion layer on the side of the light emitting layer 200 facing away from the substrate 100 further comprises:
step S022: forming an encapsulation layer 600 on a side of the light emitting layer 200 facing away from the substrate 100;
then in step S03 a light conversion layer is formed at the surface of the encapsulation layer 600 facing away from the substrate 100. Optionally, in the step of forming the light conversion layer on the surface of the encapsulation layer 600 facing away from the substrate 100: and forming a light conversion layer on the surface of the packaging layer 600, which is far away from the substrate 100, by using a process of laser etching, ink-jet printing or evaporation.
While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.
Claims (14)
1. A display panel, comprising:
a substrate;
the luminous layer comprises a plurality of display luminous units and function luminous units which are distributed in an array manner, and the plurality of function luminous units are distributed among the plurality of display luminous units at intervals;
the light extraction layer is positioned on one side, away from the substrate, of the light emitting layer; the light extraction layer is provided with a functional opening which is arranged in a penetrating way so that the functional light-emitting unit is exposed from the functional opening;
the light conversion layer is arranged on one side, away from the substrate, of the light extraction layer and comprises a plurality of light conversion units distributed at intervals, orthographic projections of the light conversion units on the light extraction layer are located in the functional openings, orthographic projections of the functional light emitting units on the substrate are respectively located in orthographic projections of the light conversion units on the substrate, and the light conversion units are used for converting visible light emitted by the functional light emitting units into infrared light.
2. The display panel according to claim 1, wherein the light emitting layer further comprises a plurality of first electrodes spaced apart from each other, and each of the first electrodes is located on a side of each of the functional light emitting units facing the substrate;
the light-emitting layer further comprises a plurality of second electrodes distributed at intervals, each second electrode is located on one side, facing the substrate, of each display light-emitting unit, and the orthographic projection of each second electrode on the substrate is larger than that of each first electrode on the substrate.
3. The display panel according to claim 2, wherein the light-emitting layer further comprises: and a third electrode on a side of the display light-emitting unit and the functional light-emitting unit facing away from the substrate, the third electrode being a common electrode.
4. The display panel according to claim 1, wherein the light conversion unit is located inside the functional opening;
or the display panel further comprises an encapsulation layer, the encapsulation layer is positioned on one side of the light extraction layer, which is far away from the light emitting layer, the light conversion layer is positioned on the surface of the encapsulation layer, which is far away from the light extraction layer, and the plurality of light conversion units are distributed at intervals on the surface of the encapsulation layer, which is far away from the light extraction layer.
5. The display panel according to claim 1, wherein the display light-emitting units include a first color light-emitting unit, a second color light-emitting unit, and a third color light-emitting unit, the first color light-emitting unit, the second color light-emitting unit, and the third color light-emitting unit form one display unit, one or more of the display units and one of the functional light-emitting units form one repeating unit, and a plurality of the repeating units are arranged in an array on the substrate.
6. The display panel according to claim 5, wherein a plurality of the display units and one of the functional light-emitting units form the repeating unit.
7. The display panel according to claim 1,
the functional light emitting unit includes a red functional unit for emitting red light, a green functional unit for emitting green light, and a blue functional unit for emitting blue light;
the conversion unit comprises a first conversion unit for converting red light into infrared light, a second conversion unit for converting green light into infrared light and a third conversion unit for converting blue light into infrared light, wherein the orthographic projection of the first conversion unit on the substrate is at least partially overlapped with the orthographic projection of the red functional unit on the substrate, the orthographic projection of the second conversion unit on the substrate is at least partially overlapped with the orthographic projection of the green functional unit on the substrate, and the orthographic projection of the third conversion unit on the substrate is at least partially overlapped with the orthographic projection of the blue functional unit on the substrate.
8. The display panel according to claim 1, wherein the display panel has a functional region, a plurality of the functional light-emitting units are spaced apart in the functional region, and the display panel further comprises a functional sensor located in the functional region.
9. The display panel of claim 8, wherein an orthographic projection of one or more of the functional light-emitting units on the substrate is within an orthographic projection of the functional sensor on the substrate.
10. A display device characterized by comprising the display panel according to any one of claims 1 to 9.
11. A method for manufacturing a display panel, comprising:
providing a substrate;
forming a light-emitting layer on the substrate, wherein the light-emitting layer comprises a plurality of display light-emitting units and functional light-emitting units which are arranged on the same layer and in an array manner, and the plurality of functional light-emitting units are distributed among the plurality of display light-emitting units at intervals;
forming a light extraction layer on one side of the light-emitting layer, which is far away from the substrate; a functional opening which penetrates through the light extraction layer is formed in the light extraction layer, so that the functional light-emitting unit is exposed from the functional opening;
and forming a light conversion layer on one side of the light extraction layer, which is far away from the substrate, wherein the light conversion layer comprises a plurality of light conversion units distributed at intervals, the light conversion units are formed in the functional openings, the orthographic projections of the functional light emitting units on the substrate are respectively positioned in the orthographic projections of the light conversion units on the substrate, and the light conversion units are used for converting visible light emitted by the functional light emitting units into infrared light.
12. The method according to claim 11, wherein in the step of forming a light conversion layer on a side of the light extraction layer away from the substrate, an evaporation process is selected to form a light conversion unit in the functional opening.
13. The method of manufacturing according to claim 11, further comprising, before the step of forming a light conversion layer on a side of the light extraction layer facing away from the substrate:
forming an encapsulation layer on one side of the light extraction layer, which is far away from the substrate;
and in the step of forming the light conversion layer on the side of the light extraction layer, which is far away from the substrate, forming the light conversion layer on the surface of the encapsulation layer, which is far away from the substrate.
14. The manufacturing method according to claim 13, wherein in the step of forming a light conversion layer on a surface of the encapsulation layer facing away from the substrate: and forming the light conversion layer on the surface of the packaging layer, which is far away from the substrate, by adopting a laser etching, ink-jet printing or evaporation process.
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| US11139444B2 (en) * | 2017-12-12 | 2021-10-05 | Universal Display Corporation | Organic electroluminescent devices containing a near-infrared down-conversion layer |
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