CN111668278A - Display panel and display device - Google Patents

Display panel and display device Download PDF

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Publication number
CN111668278A
CN111668278A CN202010612022.9A CN202010612022A CN111668278A CN 111668278 A CN111668278 A CN 111668278A CN 202010612022 A CN202010612022 A CN 202010612022A CN 111668278 A CN111668278 A CN 111668278A
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China
Prior art keywords
pixel circuit
pixel
electrically connected
light emitting
display panel
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Granted
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CN202010612022.9A
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Chinese (zh)
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CN111668278B (en
Inventor
马向文
敦栋梁
夏志强
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Wuhan Tianma Microelectronics Co Ltd
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Wuhan Tianma Microelectronics Co Ltd
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Priority to CN202010612022.9A priority Critical patent/CN111668278B/en
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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
    • H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • 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
    • H10K50/85—Arrangements for extracting light from the devices
    • 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
    • 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
    • H10K59/123—Connection of the pixel electrodes to the thin film transistors [TFT]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/549—Organic PV cells

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Electroluminescent Light Sources (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

The embodiment of the invention discloses a display panel and a display device. The display panel includes a substrate base plate; the light-emitting element layer comprises a plurality of light-emitting elements, the plurality of light-emitting elements form a display area, the display area comprises a first display area and a second display area, and the second display area is reused as a light sensing element setting area; in the second display area, the light-emitting elements comprise a first type light-emitting element and a second type light-emitting element, the pixel circuit layer comprises at least two pixel circuit sub-layers, the at least two pixel circuit sub-layers are positioned between the second type light-emitting element and the substrate, the second type light-emitting element is electrically connected with the pixel circuits in one pixel circuit sub-layer in a one-to-one correspondence mode, and the first type light-emitting element is electrically connected with the pixel circuits in the other pixel circuit sub-layer in a one-to-one correspondence mode. According to the technical scheme, normal display of the light sensation element setting area under the screen is achieved, and the screen occupation ratio of the display panel is improved.

Description

Display panel and display device
Technical Field
The present invention relates to display technologies, and in particular, to a display panel and a display device.
Background
With the development of display technology, the demand of products such as mobile phones and the like for high screen occupation ratio is increasing day by day, the screen occupation ratio is the ratio of the screen area to the whole area, and higher screen occupation ratio can bring better visual experience to users.
Because the cell-phone openly need place parts such as camera, light sensor, current solution usually is at a non-display area of screen top design, for example by solution such as "bang of now widely adopted", "water droplet screen", "dig hole screen", non-display area can not show the picture, can't realize real comprehensive screen display when considering setting up the camera.
Disclosure of Invention
The embodiment of the invention provides a display panel and a display device, which are used for realizing normal display of a light sensation element setting area under a screen and improving the screen occupation ratio of the display panel.
In a first aspect, an embodiment of the present invention provides a display panel, including:
a substrate base plate;
the light-emitting element layer comprises a plurality of light-emitting elements, the plurality of light-emitting elements form a display area, the display area comprises a first display area and a second display area, and the second display area is reused as a light sensing element arrangement area;
in the second display area, the light emitting elements include a first type light emitting element and a second type light emitting element, the pixel circuit layer includes at least two pixel circuit sub-layers, the at least two pixel circuit sub-layers are located between the second type light emitting element and the substrate, the second type light emitting element is electrically connected with the pixel circuit in one pixel circuit sub-layer in a one-to-one correspondence manner, and the first type light emitting element is electrically connected with the pixel circuit in the other pixel circuit sub-layer in a one-to-one correspondence manner.
In a second aspect, an embodiment of the present invention further provides a display device, including the display panel, further including:
the light sensing element is arranged in the second display area of the display panel and is positioned on one side of the light emergent surface which deviates from the display panel, and the light sensitive surface of the light sensing element faces the display panel.
The display panel provided by the embodiment of the invention comprises a substrate base plate; the light-emitting element layer comprises a plurality of light-emitting elements, the plurality of light-emitting elements form a display area, the display area comprises a first display area and a second display area, and the second display area is reused as a light sensing element setting area; in the second display area, the light-emitting elements comprise a first type light-emitting element and a second type light-emitting element, the pixel circuit layer comprises at least two pixel circuit sub-layers, the at least two pixel circuit sub-layers are positioned between the second type light-emitting element and the substrate, the second type light-emitting element is electrically connected with the pixel circuits in one pixel circuit sub-layer in a one-to-one correspondence mode, and the first type light-emitting element is electrically connected with the pixel circuits in the other pixel circuit sub-layer in a one-to-one correspondence mode. The light-emitting elements are arranged in the second display area, so that normal display of the second display area is realized, the screen occupation ratio of the display panel is improved, and full-screen display is realized; the light-emitting elements in the second display area are divided into the first type light-emitting elements and the second type light-emitting elements, and the pixel circuits corresponding to the first type light-emitting elements are arranged between the second type light-emitting elements and the substrate, so that the area where the first type light-emitting elements are located has light transmittance, and external light is transmitted when the light sensing elements (such as a camera) work, so that the second display area has dual functions of light transmittance and display, normal display of the light sensing element setting area under the screen is realized, and the screen occupation ratio of the display panel is improved.
Drawings
Fig. 1 is a schematic top view of a display panel according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view taken along line AA' of FIG. 1;
fig. 3 is a schematic top view illustrating a second display area of a display panel according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view taken along line AA' of FIG. 3;
FIGS. 5 and 6 are schematic views of a cross-sectional structure taken along the line BB' in FIG. 3;
FIG. 7 is a schematic view of another cross-sectional structure taken along line AA' of FIG. 3;
FIGS. 8 and 9 are schematic views of a cross-sectional structure taken along the line BB' in FIG. 3;
FIG. 10 is a schematic view of another cross-sectional structure taken along line AA' of FIG. 3;
fig. 11 is a schematic structural diagram of a second pixel circuit according to an embodiment of the invention;
fig. 12 is a schematic diagram of film structures of a first type light emitting device and a second pixel circuit according to an embodiment of the invention;
fig. 13 is a schematic diagram of film structures of another first type light emitting device and a second pixel circuit according to an embodiment of the invention;
fig. 14 is a schematic circuit diagram of a second pixel circuit according to an embodiment of the present invention;
fig. 15 is a schematic diagram illustrating a film structure of a second pixel circuit according to an embodiment of the invention;
fig. 16 is a schematic diagram of film structures of another first type light emitting device and a second pixel circuit according to an embodiment of the invention;
FIG. 17 is a schematic top view illustrating a second display area of another display panel according to an embodiment of the present invention;
FIG. 18 is a schematic top view illustrating a second display area of another display panel according to an embodiment of the present invention;
fig. 19 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It should be noted that the terms "upper", "lower", "left", "right", and the like used in the description of the embodiments of the present invention are used in the angle shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in this context, it is also to be understood that when an element is referred to as being "on" or "under" another element, it can be directly formed on "or" under "the other element or be indirectly formed on" or "under" the other element through an intermediate element. The terms "first," "second," and the like, are used for descriptive purposes only and not for purposes of limitation, and do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the existing mobile phone or tablet computer, in order to provide a sufficient frame area for disposing the front camera, the area of the display area is often limited. For example, holes are often drilled in the border area of the display panel for positioning the lens of the camera. However, the portion of the drilled hole does not have a display function, resulting in a limitation in the area of a display area in which a screen can be displayed. Therefore, the existing display panel has the technical problem that the light transmission and the display of the camera area under the screen cannot be compatible, and needs to be improved.
Accordingly, an embodiment of the present invention provides a display panel, including a substrate base plate; the light-emitting element layer comprises a plurality of light-emitting elements, the plurality of light-emitting elements form a display area, the display area comprises a first display area and a second display area, and the second display area is reused as a light sensing element setting area; in the second display area, the light-emitting elements comprise a first type light-emitting element and a second type light-emitting element, the pixel circuit layer comprises at least two pixel circuit sub-layers, the at least two pixel circuit sub-layers are positioned between the second type light-emitting element and the substrate, the second type light-emitting element is electrically connected with the pixel circuits in one pixel circuit sub-layer in a one-to-one correspondence mode, and the first type light-emitting element is electrically connected with the pixel circuits in the other pixel circuit sub-layer in a one-to-one correspondence mode.
Fig. 1 is a schematic top view of a display panel according to an embodiment of the present invention, and fig. 2 is a schematic cross-sectional view along a cross-sectional line AA' in fig. 1. Referring to fig. 1 and 2, a display panel provided by an embodiment of the present invention includes: a base substrate 10; a pixel circuit layer 20 and a light emitting element layer 30 disposed on one side of the substrate 10, wherein the light emitting element layer 30 includes a plurality of light emitting elements 31, the plurality of light emitting elements 31 form a display area, the display area includes a first display area 100 and a second display area 200, and the second display area 200 is reused as a light sensing element disposing area; in the second display area 200, the light emitting elements 31 include a first type light emitting element 311 and a second type light emitting element 312, the pixel circuit layer 20 includes two pixel circuit sublayers 21 and 22, the pixel circuit sublayer 21 and the pixel circuit sublayer 22 are both located between the second type light emitting element 312 and the substrate 10, the second type light emitting element 312 is electrically connected to the pixel circuit 211 in the pixel circuit sublayer 21 in a one-to-one correspondence manner, and the first type light emitting element 311 is electrically connected to the pixel circuit 221 in the pixel circuit sublayer 22 in a one-to-one correspondence manner. In other embodiments, it is also possible to design that the second type light emitting elements 312 are electrically connected to the pixel circuits 221 in the pixel circuit sub-layer 22 in a one-to-one correspondence, and the first type light emitting elements 311 are electrically connected to the pixel circuits 211 in the pixel circuit sub-layer 21 in a one-to-one correspondence.
It is understood that, in the first display area 100, the pixel circuit layer 20 is also provided with the pixel circuits corresponding to the light emitting elements 31 in the area, wherein the shape and size of the second display area 200 are only schematic and are not limited to the embodiment of the present invention. The display panel provided by the embodiment of the invention is suitable for a display device which needs to be provided with a light sensing element under a screen, wherein the light sensing element can be a camera, and the light sensing element is taken as the camera for example in the following description. Since the camera has a high requirement for light, the camera installation region needs to have high light transmittance, wherein the light emitting element 31 may be an organic light emitting diode, and for the organic light emitting display panel, the pixel circuit mainly affecting the light transmittance performance is a pixel circuit, so in this embodiment, the corresponding pixel circuit of the first type light emitting element 311 is designed below the second type light emitting element 312, so that the region where the first type light emitting element is located forms a light transmittance region to realize the transmission of the external light. It should be noted that, the pixel circuit layer 20 shown in fig. 2 is provided with two pixel circuit sublayers, and the number of the first type light emitting elements 311 and the second type light emitting elements 312, which account for half of each, is only schematic, and in the specific implementation, the number of the pixel circuit sublayers and the number of the first type light emitting elements may be designed according to actual requirements, where the larger the number of the first type light emitting elements is, the better the light transmittance of the second display area is, and in the limit, the light emitting elements in the second display area may all be used as the first type light emitting elements, and the corresponding pixel circuits are designed to the first display area, and in the specific implementation, the pixel circuit layer may be designed according to actual requirements.
According to the technical scheme of the embodiment of the invention, the light-emitting element is arranged in the second display area, so that the normal display of the second display area is realized, the screen occupation ratio of the display panel is improved, and the full-screen display is realized; the light-emitting elements in the second display area are divided into the first type light-emitting elements and the second type light-emitting elements, and the pixel circuits corresponding to the first type light-emitting elements are arranged between the second type light-emitting elements and the substrate, so that the area where the first type light-emitting elements are located has light transmittance, and external light is transmitted when the light sensing elements (such as a camera) work, so that the second display area has dual functions of light transmittance and display, normal display of the light sensing element setting area under the screen is realized, and the screen occupation ratio of the display panel is improved.
On the basis of the foregoing embodiment, optionally, in the second display area, the pixel circuit layer includes a first pixel circuit sublayer and a second pixel circuit sublayer, the first pixel circuit sublayer is located between the second type light emitting element and the second pixel circuit sublayer, the second type light emitting element is electrically connected to the first pixel circuit in a one-to-one correspondence manner, and the first type light emitting element is electrically connected to the second pixel circuit in a one-to-one correspondence manner; the first pixel circuit is located in the first pixel circuit sublayer, and the second pixel circuit is located in the second pixel circuit sublayer.
With reference to fig. 2, the pixel circuit sub-layer 21 is a first pixel circuit sub-layer, the pixel circuit sub-layer 22 is a second pixel circuit sub-layer, the first light emitting elements 311 are electrically connected to the second pixel circuits 221 in a one-to-one correspondence, and the second light emitting elements 312 are electrically connected to the first pixel circuits 211 in a one-to-one correspondence, so that the first pixel circuits 211 and the second pixel circuits 221 respectively drive the second light emitting elements 312 and the first light emitting elements 311 to emit light, thereby realizing normal display in the second display area.
Fig. 3 is a schematic top view of a second display area of a display panel according to an embodiment of the present invention, and fig. 4 is a schematic cross-sectional view along a cross-sectional line AA' in fig. 3. Referring to fig. 3, alternatively, a plurality of light emitting elements 31 are arranged in a pixel unit 300 arranged in an array; referring to fig. 4, a planarization layer 23 is disposed between the first pixel circuit sublayer 21 and the second pixel circuit sublayer 22, the first pixel circuit 211 includes a first scan line 212, and the second pixel circuit 221 includes a second scan line 222; in the pixel circuits corresponding to the same row of pixel units 300, the second scan lines 222 in the second pixel circuits 221 are sequentially connected in series with the first scan lines 212 in the first pixel circuits 211 through the traces 231 penetrating through the planarization layer 23, wherein the first ends a of the second pixel circuits 222 and the second ends b of the first pixel circuits 211, which are projected on the substrate 10 and overlapped with each other, are connected, and the first end c of the first pixel circuit 211 is connected to the second end d of one second pixel circuit 222 adjacent to the first pixel circuit 211 in the row direction.
The light emitting elements 31 may include a red light emitting element R, a green light emitting element G, and a blue light emitting element B according to different light emitting colors, and the three light emitting elements with different light emitting colors form a pixel unit 300, wherein the RGB arrangement shown in fig. 3 is only schematic, and may be set according to actual situations in specific implementations. The pixel circuits in the same row of pixel units are directly connected in series, and the scanning signal driving mode of the pixel units is the same as that of the first display area (normal display area), so that synchronous driving of the light-emitting elements of the first display area and the second display area is realized, the splitting feeling of a picture during display is reduced, the load of a scanning line of the second display area and the load of the scanning line of the first display area can be balanced, and the uniformity of the displayed picture can be improved.
Fig. 5 and 6 are schematic views of a cross-sectional structure taken along the cross-sectional line BB' of fig. 3. Referring to fig. 5, alternatively, the first pixel circuit 211 includes a first data line 213, and the second pixel circuit 221 includes a second data line 223; in the pixel circuits corresponding to the same column of pixel units, the second data line 223 in the second pixel circuit 221 and the first data line 213 in the first pixel circuit 211 are sequentially connected in series through a routing line 232 penetrating through the planarization layer 23, wherein a first end e of the second pixel circuit 221 and a second end f of the first pixel circuit 211, which are overlapped in projection on the substrate 10, are connected, and a first end g of the first pixel circuit 211 is connected with a second end h of one second pixel circuit 221 adjacent to the column direction. Alternatively, referring to fig. 6, in the pixel circuits corresponding to the same column of pixel units, the first data lines 213 in the first pixel circuits 211 are sequentially connected, and the second data lines 223 in the second pixel circuits 221 are sequentially connected.
In the embodiment shown in fig. 5, the pixel circuits in each row of pixel units are directly connected in series, and the data signal driving manner is the same as that of the first display area (normal display area), so that the synchronous driving of the light emitting elements in the first display area and the second display area is realized, the split feeling of the picture during the display is reduced, the load of the scanning lines in the second display area and the load of the scanning lines in the first display area can be balanced, and the uniformity of the display picture can be improved. In the embodiment shown in fig. 6, two layers of data lines are disposed to connect two layers of pixel circuits in series, so that it is avoided that too many wires penetrate through the planarization layer 23, which is beneficial to simplifying the manufacturing process.
Fig. 7 is a schematic view of another cross-sectional structure taken along the cross-sectional line AA' in fig. 3. Referring to fig. 3, alternatively, a plurality of light emitting elements 31 are arranged in a pixel unit 300 arranged in an array; referring to fig. 7, a planarization layer 23 is disposed between the first pixel circuit sublayer 21 and the second pixel circuit sublayer 22, the first pixel circuit 211 includes a first scan line 214, and the second pixel circuit 221 includes a second scan line 224; in the pixel circuits corresponding to the pixel units 300 in the same row, the first scan lines 214 in the first pixel circuits 211 are sequentially connected, and the second scan lines 224 in the second pixel circuits 221 are sequentially connected.
The scanning lines in the pixel circuits on the same layer are arranged in series, and then the shift register circuits are respectively connected into the frame areas, so that the independent control of the first type of light-emitting elements and the second type of light-emitting elements is realized, and the wiring design difficulty can be simplified.
Fig. 8 and 9 are schematic views of alternative cross-sectional structures along the cross-sectional line BB' of fig. 3, respectively. Referring to fig. 8, alternatively, the first pixel circuit 211 includes a first data line 215, and the second pixel circuit 221 includes a second data line 225; in the pixel circuits corresponding to the same column of pixel units, the second data line 225 in the second pixel circuit 221 and the first data line 215 in the first pixel circuit 211 are sequentially connected in series through a routing line 233 penetrating through the planarization layer 23, wherein a first end a of the second pixel circuit 221 and a second end b of the first pixel circuit 211, which are overlapped in projection on the substrate 10, are connected, and a first end c of the first pixel circuit 211 is connected with a second end d of one second pixel circuit 221 adjacent to the column direction. Alternatively, referring to fig. 9, in the pixel circuits corresponding to the pixel units in the same column, the first data lines 215 in the first pixel circuits 211 are sequentially connected, and the second data lines 225 in the second pixel circuits 221 are sequentially connected.
In the embodiment shown in fig. 8, the pixel circuits in each row of pixel units are directly connected in series, and the data signal driving manner is the same as that of the first display area (normal display area), so that the synchronous driving of the light emitting elements in the first display area and the second display area is realized, the split feeling of the picture during the display is reduced, the load of the scanning lines in the second display area and the load of the scanning lines in the first display area can be balanced, and the uniformity of the display picture can be improved. In the embodiment shown in fig. 9, two layers of data lines are disposed to connect two layers of pixel circuits in series, so that it is avoided that too many wires penetrate through the planarization layer 23, which is beneficial to simplifying the manufacturing process.
Fig. 10 is a schematic view of another cross-sectional structure taken along the cross-sectional line AA' in fig. 3. Referring to fig. 10, optionally, the display panel provided in this embodiment further includes a first shielding layer 24, where the first shielding layer 24 is located in the planarization layer 23 between the first pixel circuit sublayer 21 and the second pixel circuit sublayer 22.
It can be understood that, because the first pixel circuit sublayer 21 and the second pixel circuit sublayer 22 are stacked, when no trace penetrating the planarization layer 23 is disposed between the two pixel circuits, the first shielding layer 24 may be disposed between the two pixel circuits, so as to prevent the two pixel circuits from interfering with each other. In other embodiments, considering signal coupling and light transmittance, the planarization layer 23 may be made of an organic oxygen-controlling material with high light transmittance, and the thickness thereof may be 2 μm to 3 μm.
Fig. 11 is a schematic structural diagram of a second pixel circuit according to an embodiment of the invention. Referring to fig. 11, alternatively, the first type light emitting element includes a first electrode D1, a light emitting layer, and a second electrode D2; the second pixel circuit includes: the driving module 1, wherein the control end a1 of the driving module 1 is electrically connected with the first node N1; a first initialization block 2, a control terminal a1 of the first initialization block 2 being electrically connected to a first scan signal line S1, a first terminal a2 of the first initialization block 2 being electrically connected to a first reference signal line Ref1, and a second terminal a3 of the first initialization block 2 being electrically connected to a first node N1; a threshold compensation module 3, wherein a control terminal a1 of the threshold compensation module 3 is electrically connected to the second scan signal line S2, a first terminal a2 of the threshold compensation module 3 is electrically connected to a second terminal a3 of the driving module 1, and a second terminal a3 of the threshold compensation module 3 is electrically connected to the first node N1; a Data writing module 4, the Data writing module 4 being configured to write a Data signal into the first node N1, the Data signal being provided by the Data signal line Data; a memory module 5, a first terminal c1 of the memory module 5 being electrically connected to the first power signal line VDD, and a second terminal c2 of the memory module 5 being electrically connected to the first node n 1; a second initializing module 6, a control terminal a1 of the second initializing module 6 being electrically connected to the second scan signal line S2, a first terminal a2 of the second initializing module 6 being electrically connected to the second reference signal line Ref2, a second terminal a3 of the second initializing module 6 being electrically connected to the first electrode D1, the second initializing module 6 being configured to initialize a potential of the first electrode D1 in an initializing stage; a first light emission control module 7, wherein a control end a1 of the first light emission control module 7 is electrically connected to the enable signal line Emit, a first end a2 of the first light emission control module 7 is electrically connected to the first power signal line VDD, and a second end a3 of the first light emission control module 7 is electrically connected to the first end a2 of the driving module 1; and/or the second lighting control module 8, wherein the control end a1 of the second lighting control module 8 is electrically connected with the enable signal line Emit, the first end a2 of the second lighting control module 8 is electrically connected with the second end a3 of the driving module 1, the second end a3 of the second lighting control module 8 is electrically connected with the first electrode D1, and the second electrode D2 is electrically connected with the second power signal line VSS.
It is understood that the second pixel circuit provided in this embodiment is a pixel circuit with threshold compensation, wherein the structure of the first pixel circuit may be the same as that of the second pixel circuit. The pixel circuit driving the light emitting element to emit light generally includes three stages, i.e., an initialization stage, a data writing stage, and a light emitting stage. The driving module 1 is used for providing a driving current for the light-emitting element, and the light-emitting element emits light in response to the driving current; the first initialization module 2 is used for initializing the potential of the control terminal a1 of the driving module 1 in an initialization stage; the threshold compensation module 3 is used for writing a compensation signal into the control terminal a1 of the driving module 1 before the light-emitting phase; the memory module 5 is used to maintain the potential of the control terminal a1 of the driving module 1 in the light emitting phase. The light emitting element is a current driving element, and supplies a power supply voltage through a first power supply signal line VDD, and controls the current output by the driving module 1 through a data signal to realize the adjustment of the light emitting brightness. The first light-emitting control module 7 and/or the second light-emitting control module 8 are used for conducting in a light-emitting stage and controlling the light-emitting elements to emit light. The first electrode D1 is an anode, the second electrode D2 is a cathode, the first power signal line VDD provides an anode voltage, and the second power signal line VSS provides a cathode voltage.
In the embodiment of the invention, the first type light emitting element and the second pixel circuit are arranged in a staggered manner, so that the first electrode of the first type light emitting element and the second pixel circuit need to be connected through a lead. Fig. 12 is a schematic diagram illustrating a film structure of a first type light emitting device and a second pixel circuit according to an embodiment of the present invention. Referring to fig. 12, optionally, the second pixel circuit further includes a connection terminal 40, a first trace 41 and a second trace 42; the first trace 41 is used to connect the first electrode D1 and the connection terminal 40, the first trace 41 is a transparent trace, and may be formed by using Indium Tin Oxide (ITO), for example; the second trace 42 is used to connect the second end N2 of the second lighting control module and the connection terminal 40, and the connection terminal 40 electrically connects the first trace 41 and the second trace 42 through the through hole.
It is understood that three first-type light emitting elements are shown in fig. 12, which may be a red light emitting element R, a green light emitting element G, and a blue light emitting element B, wherein the shapes of the first routing line 41 and the second routing line 42 are only schematic, and may be set according to an actual film layer relationship in a specific implementation. In this embodiment, distances between different first light emitting elements and corresponding pixel circuits are different, and in order to avoid uneven display caused by different wiring resistances, optionally, a resistance difference value between the first wiring and the second wiring corresponding to different light emitting elements is smaller than or equal to a preset value.
Fig. 13 is a schematic diagram illustrating a film structure of another first type light emitting device and a second pixel circuit according to an embodiment of the invention. Referring to fig. 13, the second routing line 42 corresponding to the red light emitting element R is provided with a routing area 421, so that the resistances between the three light emitting elements are balanced, and the specific difference can be designed according to actual situations.
It should be noted that fig. 13 is only a schematic illustration of the principle of balancing the trace resistance, and does not limit the embodiment of the present invention.
Optionally, the second pixel circuit further includes a second shielding layer, where the second shielding layer is electrically connected to the first power signal line and is used to shield the capacitive coupling between the first node and the second trace in the same-layer pixel circuit.
Through setting up the second shielding layer, can avoid the second to walk the line and couple between the adjacent second pixel circuit, promote display effect.
Fig. 14 is a schematic circuit structure diagram of a second pixel circuit according to an embodiment of the invention, and fig. 15 is a schematic film structure diagram of the second pixel circuit according to the embodiment of the invention. Referring to fig. 14, optionally, the driving module 1 includes a driving transistor T0, the first initialization module 2 includes a first transistor T1, the threshold compensation module 3 includes a second transistor T2, the data writing module 4 includes a third transistor T3, the first lighting control module 7 includes a fourth transistor T4, the second lighting control module 8 includes a fifth transistor T5, the second initialization module 6 includes a sixth transistor T6, and the storage module 5 includes a first capacitor C1; in the present embodiment, the first transistor T1 and the second transistor T2 are double gate transistors. Referring to fig. 15, the first scan signal line S1, the second scan signal line S2, the enable signal line Emit, and the gates of the respective transistors extending in the first direction x are provided in the same layer; a first reference signal line Ref1, a second reference signal line Ref2 and a first plate C11 of a first capacitor C1 extending along the first direction x are disposed in the same layer, the first plate C11 of the first capacitor C1 is electrically connected to the first power signal line VDD, and the second shielding layer 50 is disposed in the same layer as the first reference signal line Ref 1; a Data signal line Data extending in the second direction y and the first power signal line VDD are disposed on the same layer, and the Data signal line Data is used for providing a Data signal; wherein the first direction x intersects the second direction y.
In other embodiments, the second shielding layer may also be provided as a separate metal layer, which is not limited in this embodiment of the present invention.
Fig. 16 is a schematic diagram illustrating film structures of another first type light emitting device and a second pixel circuit according to an embodiment of the invention. Referring to fig. 16, alternatively, the plurality of second routing lines 42 form a first area 43 between the projections of the substrate base, and the first node N1 in the second pixel circuit is located in the first area 43 in the substrate base projection.
In specific implementation, the distance between the second trace 42 and the first node N1 in other second pixel circuits can be increased as much as possible to avoid the light emitting element from being influenced by the coupling between the second trace 42 and the first node N1.
Optionally, the plurality of first type light emitting elements form a first pixel unit, and the plurality of second type light emitting elements form a second pixel unit; the first pixel units and the second pixel units are arranged at intervals along a first direction; along the second direction, the first pixel units and the second pixel units are arranged at intervals; wherein the first direction and the second direction intersect.
Fig. 17 is a schematic top view illustrating a second display area of another display panel according to an embodiment of the present invention. Referring to fig. 17, three first type light emitting elements 311 constitute a first pixel unit 301, and a semi-transmissive region is formed without a pixel circuit under the first pixel unit 301; three second-type light-emitting elements 312 constitute a second pixel unit 302; along a first direction x, the first pixel unit 301 and the second pixel unit 302 are arranged at intervals; along the second direction y, the first pixel unit 301 and the second pixel unit 302 are arranged at intervals; wherein the first direction x and the second direction y intersect.
Optionally, the plurality of first type light emitting elements form a first pixel unit, and the plurality of second type light emitting elements form a second pixel unit; the first pixel units and the second pixel units are arranged at intervals along a first direction; along a second direction, the plurality of first pixel units are sequentially arranged, and the plurality of second pixel units are sequentially arranged; wherein the first direction and the second direction intersect.
Fig. 18 is a schematic top view illustrating a second display area of another display panel according to an embodiment of the present invention. Referring to fig. 18, three first type light emitting elements 311 constitute a first pixel unit 301, and a semi-transmissive region is formed without a pixel circuit under the first pixel unit 301; three second-type light-emitting elements 312 constitute a second pixel unit 302; along a first direction x, the first pixel unit 301 and the second pixel unit 302 are arranged at intervals; along the second direction y, the plurality of first pixel units 301 are sequentially arranged, and the plurality of second pixel units 302 are sequentially arranged; wherein the first direction x and the second direction y intersect.
It should be noted that the pixel arrangement of the second display region shown in fig. 17 and 18 is only schematic, and the specific implementation can be flexibly designed according to actual situations.
Optionally, the density and arrangement of the light emitting elements in the first display area and the second display area are the same, so that the first display area and the second display area have the same display effect.
Optionally, the density of the light emitting elements in the first display area is greater than that of the light emitting elements in the second display area, so that the light transmittance of the second display area can be increased, the imaging effect of the camera can be improved, the display effect and the light transmittance of the second display area can be considered in a balanced manner during specific implementation, and the design is carried out according to actual requirements.
Fig. 19 is a schematic structural diagram of a display device according to an embodiment of the present invention. Referring to fig. 19, the display device 60 includes any one of the display panels 70 provided in the above embodiments, and further includes: the light sensing element 80 is disposed in the second display region of the display panel 70 and located on a side of the light emitting surface away from the display panel 70, and a light sensing surface of the light sensing element 80 faces the display panel 70. The display device 60 may be a mobile phone, a tablet computer, or the like.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (18)

1. A display panel, comprising:
a substrate base plate;
the light-emitting element layer comprises a plurality of light-emitting elements, the plurality of light-emitting elements form a display area, the display area comprises a first display area and a second display area, and the second display area is reused as a light sensing element arrangement area;
in the second display area, the light emitting elements include a first type light emitting element and a second type light emitting element, the pixel circuit layer includes at least two pixel circuit sub-layers, the at least two pixel circuit sub-layers are located between the second type light emitting element and the substrate, the second type light emitting element is electrically connected with the pixel circuit in one pixel circuit sub-layer in a one-to-one correspondence manner, and the first type light emitting element is electrically connected with the pixel circuit in the other pixel circuit sub-layer in a one-to-one correspondence manner.
2. The display panel according to claim 1, wherein in the second display region, the pixel circuit layer comprises a first pixel circuit sublayer and a second pixel circuit sublayer, the first pixel circuit sublayer is located between the second type light emitting elements and the second pixel circuit sublayer, the second type light emitting elements are electrically connected to the first pixel circuits in a one-to-one correspondence, and the first type light emitting elements are electrically connected to the second pixel circuits in a one-to-one correspondence;
wherein the first pixel circuit is located in the first pixel circuit sublayer and the second pixel circuit is located in the second pixel circuit sublayer.
3. The display panel according to claim 2, wherein a plurality of the light emitting elements are arranged in a pixel unit arranged in an array;
a planarization layer is arranged between the first pixel circuit sublayer and the second pixel circuit sublayer, the first pixel circuit comprises a first scanning line, and the second pixel circuit comprises a second scanning line;
in the pixel circuits corresponding to the pixel units in the same row, the second scan lines in the second pixel circuits are sequentially connected in series with the first scan lines in the first pixel circuits through routing lines penetrating through the planarization layer, wherein the first ends of the second pixel circuits, which are overlapped in projection on the substrate, are connected with the second ends of the first pixel circuits, and the first end of the first pixel circuit is connected with the second end of one second pixel circuit adjacent to the first pixel circuit in the row direction.
4. The display panel according to claim 3, wherein the first pixel circuit includes a first data line, and wherein the second pixel circuit includes a second data line;
in the pixel circuits corresponding to the pixel units in the same column, a second data line in the second pixel circuit is sequentially connected in series with a first data line in the first pixel circuit through a routing wire penetrating through the planarization layer, wherein a first end of the second pixel circuit overlapped in projection on the substrate is connected with a second end of the first pixel circuit, and the first end of the first pixel circuit is connected with a second end of one second pixel circuit adjacent to the column direction; or
In the pixel circuits corresponding to the pixel units in the same column, the first data lines in the first pixel circuits are connected in sequence, and the second data lines in the second pixel circuits are connected in sequence.
5. The display panel according to claim 2, wherein a plurality of the light emitting elements are arranged in a pixel unit arranged in an array;
a planarization layer is arranged between the first pixel circuit sublayer and the second pixel circuit sublayer, the first pixel circuit comprises a first scanning line, and the second pixel circuit comprises a second scanning line;
in the pixel circuits corresponding to the pixel units in the same row, the first scanning lines in the first pixel circuits are connected in sequence, and the second scanning lines in the second pixel circuits are connected in sequence.
6. The display panel according to claim 5, wherein the first pixel circuit includes a first data line, and wherein the second pixel circuit includes a second data line;
in the pixel circuits corresponding to the pixel units in the same column, a second data line in the second pixel circuit is sequentially connected in series with a first data line in the first pixel circuit through a routing wire penetrating through the planarization layer, wherein a first end of the second pixel circuit overlapped in projection on the substrate is connected with a second end of the first pixel circuit, and the first end of the first pixel circuit is connected with a second end of one second pixel circuit adjacent to the column direction; or
In the pixel circuits corresponding to the pixel units in the same column, the first data lines in the first pixel circuits are connected in sequence, and the second data lines in the second pixel circuits are connected in sequence.
7. The display panel of claim 5, further comprising a first shielding layer located within the planarization layer between the first pixel circuit sub-layer and the second pixel circuit sub-layer.
8. The display panel according to claim 2, wherein the first-type light-emitting element comprises a first electrode, a light-emitting layer, and a second electrode;
the second pixel circuit includes:
the control end of the driving module is electrically connected with the first node;
a control end of the first initialization module is electrically connected with a first scanning signal line, a first end of the first initialization module is electrically connected with a first reference signal line, and a second end of the first initialization module is electrically connected with the first node;
a control end of the threshold compensation module is electrically connected with a second scanning signal line, a first end of the threshold compensation module is electrically connected with a second end of the driving module, and a second end of the threshold compensation module is electrically connected with the first node;
a data write module for writing a data signal to the first node;
a memory module, a first end of the memory module being electrically connected to a first power signal line, a second end of the memory module being electrically connected to the first node;
a second initialization module, a control end of which is electrically connected to the second scanning signal line, a first end of which is electrically connected to a second reference signal line, a second end of which is electrically connected to the first electrode, and which is used to initialize a potential of the first electrode in an initialization stage;
a first light emitting control module, a control end of which is electrically connected with an enable signal line, a first end of which is electrically connected with the first power signal line, and a second end of which is electrically connected with a first end of the driving module; and/or the presence of a gas in the gas,
and a control end of the second light emission control module is electrically connected with the enable signal line, a first end of the second light emission control module is electrically connected with a second end of the driving module, a second end of the second light emission control module is electrically connected with the first electrode, and the second electrode is electrically connected with the second power signal line.
9. The display panel according to claim 8, further comprising a connection terminal, a first trace, and a second trace;
the first wire is used for connecting the first electrode and the connecting terminal, and the first wire is a transparent wire;
the second wire is used for connecting a second end of the second light-emitting control module with the connecting terminal, and the connecting terminal electrically connects the first wire with the second wire through a through hole.
10. The display panel according to claim 9, wherein a difference in resistance between the first wire and the second wire corresponding to different light emitting elements is less than or equal to a predetermined value.
11. The display panel according to claim 9, wherein the second pixel circuit further comprises a second shielding layer electrically connected to the first power signal line for shielding the capacitive coupling between the first node and the second trace in the same-layer pixel circuit.
12. The display panel according to claim 11, wherein the driving module includes a driving transistor, the first initialization module includes a first transistor, the threshold compensation module includes a second transistor, the data writing module includes a third transistor, the first light emission control module includes a fourth transistor, the second light emission control module includes a fifth transistor, the second initialization module includes a sixth transistor, and the storage module includes a first capacitor;
the first scanning signal line, the second scanning signal line, the enabling signal line and the grid electrodes of the transistors extending along the first direction are arranged in the same layer;
the first reference signal line, the second reference signal line and a first plate of the first capacitor extending along the first direction are arranged on the same layer, the first plate of the first capacitor is electrically connected with the first power signal line, and the second shielding layer is arranged on the same layer as the first reference signal line;
a data signal line extending in a second direction and a first power signal line are disposed in the same layer, the data signal line being for supplying the data signal;
wherein the first direction intersects the second direction.
13. The display panel according to claim 9, wherein the second traces form a first region between projections of the substrate base, and the first node in the second pixel circuit is located in the first region in the substrate base projection.
14. The display panel according to any one of claims 2 to 13, wherein a plurality of the first type light emitting elements constitute a first pixel unit, and a plurality of the second type light emitting elements constitute a second pixel unit;
the first pixel unit and the second pixel unit are arranged at intervals along a first direction;
along a second direction, the first pixel unit and the second pixel unit are arranged at intervals;
wherein the first direction and the second direction intersect.
15. The display panel according to any one of claims 2 to 13, wherein a plurality of the first type light emitting elements constitute a first pixel unit, and a plurality of the second type light emitting elements constitute a second pixel unit;
the first pixel unit and the second pixel unit are arranged at intervals along a first direction;
along a second direction, the first pixel units are sequentially arranged, and the second pixel units are sequentially arranged;
wherein the first direction and the second direction intersect.
16. The display panel according to claim 1, wherein the density and arrangement of the light emitting elements in the first display region and the second display region are the same.
17. The display panel according to claim 1, wherein a density of the light emitting elements in the first display region is larger than a density of the light emitting elements in the second display region.
18. A display device comprising the display panel according to any one of claims 1 to 17, further comprising:
the light sensing element is arranged in the second display area of the display panel and is positioned on one side of the light emergent surface which deviates from the display panel, and the light sensitive surface of the light sensing element faces the display panel.
CN202010612022.9A 2020-06-29 2020-06-29 Display panel and display device Active CN111668278B (en)

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