CN110993680A - Flexible display panel and electronic equipment - Google Patents
Flexible display panel and electronic equipment Download PDFInfo
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- CN110993680A CN110993680A CN201911417919.XA CN201911417919A CN110993680A CN 110993680 A CN110993680 A CN 110993680A CN 201911417919 A CN201911417919 A CN 201911417919A CN 110993680 A CN110993680 A CN 110993680A
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
Abstract
The embodiment of the invention discloses a flexible display panel and electronic equipment, wherein the panel comprises: a light emitting device layer including a plurality of light emitting devices; the display device comprises a display area, a first pixel circuit layer and a second pixel circuit layer, wherein the display area comprises at least one first display area, at least one second display area, a bending area positioned between the first display area and the second display area, and the first pixel circuit layer is positioned between the light-emitting device layer and the second pixel circuit layer; the first pixel circuit layer is arranged in the first display area and drives the light-emitting device of the first display area, and the second pixel circuit layer is arranged in the first display area and drives the light-emitting device of the second display area; or the first pixel circuit layer and the second pixel circuit layer are arranged in the bending region and drive the light-emitting device of the bending region. The embodiment of the invention improves the bending performance and avoids the damage caused by bending extrusion.
Description
Technical Field
The embodiment of the invention relates to a display technology, in particular to a flexible display panel and electronic equipment.
Background
Wearable equipment is directly worn on one's body promptly, or integrate to a portable equipment of user's clothes or accessory, and wearable equipment realizes powerful function through software support and data interaction, high in the clouds interaction, will bring very big transformation to our life, perception.
Present wearable equipment is mostly intelligent wrist-watch, mainly adopts organic light emitting display product. The display area of small-size intelligence wrist-watch is too little, and is inconvenient to look over, produces the folding product of jumbo size on this basis, can realize the size switch of display area around it is folding, is convenient for be used for looking over, but frequent folding causes equipment to buckle the damage easily, influences the display effect.
Disclosure of Invention
The embodiment of the invention provides a flexible display panel and electronic equipment, which are used for improving bending performance.
An embodiment of the present invention provides a flexible display panel, including:
a light emitting device layer including a plurality of light emitting devices;
the display device comprises a display area, a first pixel circuit layer and a second pixel circuit layer, wherein the display area comprises at least one first display area, at least one second display area, a bending area between the first display area and the second display area, and a first pixel circuit layer and a second pixel circuit layer, and the first pixel circuit layer is positioned between the light-emitting device layer and the second pixel circuit layer;
the first pixel circuit layer is arranged in the first display area and drives the light emitting device of the first display area, and the second pixel circuit layer is arranged in the first display area and drives the light emitting device of the second display area; or, the first pixel circuit layer and the second pixel circuit layer are disposed in the bending region and drive the light emitting device of the bending region.
The embodiment of the invention also provides electronic equipment which comprises the flexible display panel.
In the embodiment of the invention, the flexible display device can be bent in the bending area to enable the first display area and the second display area to be mutually attached or form a certain angle between the first display area and the second display area, so that the flexible display device is conveniently applied to wearable equipment or other folding equipment. In the embodiment of the invention, the first pixel circuit layer and the second pixel circuit layer are both arranged in the first display area, wherein the first pixel circuit layer drives the light-emitting device in the first display area to emit light, and/or the second pixel circuit layer drives the light-emitting device in the second display area to emit light, so that the display panel can be switched between a small-size display panel and a large-size display panel. In addition, the pixel circuit is not arranged in the bending area, so that the bending performance is improved, the pixel circuit damage caused by extrusion in the bending process is avoided, and the display effect of the display area is ensured to be normal.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the embodiments or the technical solutions in the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a flexible display panel according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view taken along A-A' of FIG. 1;
FIG. 3 is a schematic view of FIG. 1 in a folded state;
FIG. 4 is another schematic view of FIG. 1 in a folded state;
fig. 5 is a schematic diagram of a connection of the second pixel circuit and the light emitting device in fig. 1;
fig. 6 is a schematic view of the connection of the second pixel circuit and the light emitting device in fig. 1;
fig. 7 is a schematic diagram of a flexible display panel according to an embodiment of the present invention;
FIG. 8 is a schematic layout diagram of the pixel circuit in the bending region of FIG. 7;
FIG. 9 is a schematic layout diagram of the pixel circuit in the bending region of FIG. 7;
FIG. 10 is a schematic layout diagram of the pixel circuit in the bending region of FIG. 7;
fig. 11 is a schematic diagram of a flexible display panel according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described through embodiments with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a flexible display panel according to an embodiment of the present invention is shown, and fig. 2 is a cross-sectional view taken along a-a' of fig. 1. The flexible display panel provided by the embodiment of the invention comprises: a light emitting device layer 1, the light emitting device layer 1 including a plurality of light emitting devices 11; the display area 2, the display area 2 includes at least one first display area 21 and second display area 22 and a bending area 23 located between the first display area 21 and the second display area 22, and also includes a first pixel circuit layer 3 and a second pixel circuit layer 4, the first pixel circuit layer 3 is located between the light-emitting device layer 1 and the second pixel circuit layer 4; the first pixel circuit layer 3 is disposed in the first display region 21 and drives the light emitting devices 11 of the first display region 21, and the second pixel circuit layer 4 is disposed in the first display region 21 and drives the light emitting devices 11 of the second display region 22.
In this embodiment, the light emitting device layer 1 emits light to realize a display function. The light emitting device layer 1 includes a plurality of light emitting devices 11 arranged in an array, the number of the light emitting devices 11 is related to the resolution of the display panel, and the number of the light emitting devices in the display panel varies according to the required resolution of different products. In the display stage, the respective light emitting devices 11 in the light emitting device layer 1 display image content to realize a display function, and a display process and a principle of the display stage are not described herein. The light emitting device layer 1 includes at least three light emitting devices 11 emitting different color spectra, and the optional light emitting device layer 1 includes a plurality of light emitting devices emitting a red color spectrum, a plurality of light emitting devices emitting a green color spectrum, and a plurality of light emitting devices emitting a blue color spectrum. In other embodiments, the light emitting device layer may further include light emitting devices with two or more different color spectrums, which is not limited in the present invention.
The selective flexible display panel is characterized in that organic light-emitting bodies directly emitting RGB three-color spectrums are respectively arranged in RGB three light-emitting device areas, the organic light-emitting body in the R light-emitting device area directly emits a red spectrum, the organic light-emitting body in the G light-emitting device area directly emits a green spectrum, and the organic light-emitting body in the B light-emitting device area directly emits a blue spectrum. In other embodiments, the display panel may further include a white organic light emitting layer and an RGB three-color filter disposed on the white organic light emitting layer.
In this embodiment, the display area 2 is divided into a first display area 21, a second display area 22 and a bending area 23 located between the first display area 21 and the second display area 22, and each display area is a flexible display panel area covered by the display area. It can be understood that the plurality of light emitting devices 11 of the light emitting device layer 1 are uniformly distributed, and the area covered by the light emitting devices is the display area 2, and the display area 2 can be folded in the bending area 23, and the folded second display area 22 is attached to the first display area 21. Specifically, the display area 2 has a light emitting surface 2a, and the adhesion of the second display area 22 to the first display area 21 means that the light emitting surface of the second display area 22 is adhered to the light emitting surface of the first display area 21.
In this embodiment, the flexible display panel further includes a first pixel circuit layer 3 and a second pixel circuit layer 4, the first pixel circuit layer 3 is located between the light emitting device layer 1 and the second pixel circuit layer 4; the first pixel circuit layer 3 is disposed in the first display region 21 and drives the light emitting devices 11 of the first display region 21, the second pixel circuit layer 4 is disposed in the first display region 21 and drives the light emitting devices 11 of the second display region 22, and the first pixel circuit layer 3 and the second pixel circuit layer 4 are disposed in a stacked manner and are disposed in the first display region 21.
The first pixel circuit layer 3 is used for driving the light emitting devices 11 in the first display area 21, and obviously, the first pixel circuit layer 3 includes a plurality of first pixel circuits, and the first display area 21 includes a plurality of light emitting devices 11, and the plurality of first pixel circuits and the plurality of light emitting devices 11 are respectively disposed and electrically connected. The output terminal of the first pixel circuit is directly electrically connected to the corresponding light emitting device 11 in the first display region 21. The second pixel circuit layer 4 is used for driving the light emitting devices 11 in the second display region 22, and obviously, the second pixel circuit layer 4 includes a plurality of second pixel circuits, and the second display region 22 includes a plurality of light emitting devices 11, and the plurality of second pixel circuits are respectively disposed and electrically connected to the plurality of light emitting devices 11. The output terminals of the second pixel circuits are led out from the first display area 21 by extension and electrically connected to the corresponding light emitting devices 11 in the second display area 22.
The first pixel circuit layer 3 and the second pixel circuit layer 4 may be structurally independent from each other, for example, their driving circuits are completely independent. There are various modes of controlling and driving the pixel circuit layer by the flexible display panel. Fig. 2 simply shows the position relationship between the first pixel circuit layer and the second pixel circuit layer, the first pixel circuit and the second pixel circuit have similar structures, and the light emitting principle and the process thereof are similar, and are not repeated herein.
It is understood that the bending region is further provided with a light emitting device, and the light emitting device of the bending region may be electrically connected to a plurality of first pixel circuits in the first pixel circuit layer, and/or the light emitting device of the bending region may be electrically connected to a plurality of second pixel circuits in the second pixel circuit layer, so that when the flexible display device is in the unfolded state, an overall image may be displayed. Obviously, the first pixel circuit layer may drive the light emitting devices of the first display area and the bending area, but not drive the light emitting devices of the second display area, and similarly, the second pixel circuit layer may drive the light emitting devices of the second display area and the bending area, but not drive the light emitting devices of the first display area.
Optionally, the first pixel circuit layer is disposed in the first display region and drives the light emitting device of the first display region, and the second pixel circuit layer is disposed in the first display region and drives the light emitting device of the second display region; in the folding display stage, the second display area is arranged in contact with the first display area, the second display area does not display and is switched into a transparent state to display in the first display area; in the unfolding display stage, the second display area, the bending area and the first display area are positioned on the same plane, and the second display area and the first display area are displayed simultaneously. The relevant film layers of the optional second display area are high-transmittance film layers so as to be switched between a transparent state or a display state.
Referring to fig. 2, the flexible display panel includes an unfolding display stage, the display area of the flexible display panel is a plane, and the first pixel circuit layer 3 and the second pixel circuit layer 4 control the light emitting device 11 in the display area 2 to emit light and display an image, thereby realizing large-size full-area display.
Referring to fig. 3, the flexible display panel includes a folding display stage, the flexible display panel may be folded in a bending area 23, so that the first display area 21 and the second display area 22 are attached to each other, at this time, the second display area 22 of the flexible display panel is not displayed and is switched to a transparent state, and the light emitting device 11 of the first display area 21 is controlled to emit light and display an image through the first pixel circuit layer 3, so that small-size single-sided display is achieved. It is understood that if the first pixel circuit layer is also electrically connected to at least one light emitting device in the bending region, the light emitting device of the bending region also displays an image.
Referring to fig. 4, the flexible display panel includes a folding display stage, where the flexible display panel may be folded in a bending region 23, so that a right angle or other non-0 angle is formed between the first display region 21 and the second display region 22, and at this time, the flexible display panel controls the light emitting device 11 of the first display region 21 to emit light and display an image through the first pixel circuit layer 3, or controls the light emitting device 11 of the second display region 22 to emit light and display an image through the second pixel circuit layer 4, so as to implement small-size single-sided display; alternatively, the light emitting devices 11 of the display region 2 are controlled to emit light and display an image by the first pixel circuit layer 3 and the second pixel circuit layer 4, thereby realizing large-size full-screen display in a bent state.
In other embodiments, the first display area and the second display area may have different display structures, and the first display area and the second display area can be bent and attached to achieve stereoscopic display.
In this embodiment, the flexible display device can be bent in the bending area to enable the first display area and the second display area to be mutually attached or form a certain angle therebetween, so that the flexible display device can be conveniently applied to wearable equipment or other folding equipment. In this embodiment, the first pixel circuit layer and the second pixel circuit layer are both disposed in the first display area, wherein the first pixel circuit layer drives the light emitting device in the first display area to emit light, and/or the second pixel circuit layer drives the light emitting device in the second display area to emit light, so that the display panel can be switched between a small-size display panel and a large-size display panel. In addition, the pixel circuit is not arranged in the bending area, so that the damage of the pixel circuit caused by extrusion during bending is avoided, and the display effect of the display area is ensured to be normal.
Alternatively, referring to fig. 5, the light emitting device 11 includes a first electrode 11a, a light emitting material layer 11b, and a second electrode 11c, and the plurality of light emitting devices 11 of the second display region 22 share the second electrode 11 c; the first pixel circuit layer 3 includes a plurality of first pixel circuits 31, the second pixel circuit layer 4 includes a plurality of second pixel circuits 41, and output terminals of the second pixel circuits 41 are electrically connected to the first electrodes 11a of the corresponding light emitting devices 11. The light emitting device 11 may further include a hole function layer disposed between the first electrode 11a and the light emitting material layer 11b for improving the injection efficiency of the holes of the first electrode 11a into the light emitting material layer 11b, and the light emitting device 11 further includes an electron function layer disposed between the second electrode 11c and the light emitting material layer 11b for improving the injection efficiency of the electrons of the second electrode 11c into the light emitting material layer 11b, thereby improving the light emitting efficiency. The optional hole functional layer comprises at least one film layer of a hole transport layer, a hole injection layer and an electron blocking layer, and the electronic functional layer comprises at least one film layer of an electron transport layer, an electron injection layer and a hole blocking layer.
The second electrode 11c of the light emitting device 11 is a cathode, and is usually a whole-surface electrode, all the light emitting devices 11 are shared, the first electrode 11a of the light emitting device 11 is an anode, and is usually a block-shaped electrode, the anodes of different light emitting devices 11 are independent and insulated from each other, and the output terminal of one pixel circuit is electrically connected to the anode of one light emitting device 11. When a voltage is applied to the cathode and a voltage is applied to the anode of the target light emitting device 11, holes of the anode and electrons of the cathode in the target light emitting device 11 are injected into the light emitting material layer 11b to make the light emitting material layer 11b electroluminesce.
In this embodiment, the second pixel circuit 41 is located in the first display region 21 and electrically connected to the light emitting device 11 of the second display region 22, so that the output terminal of the second pixel circuit 41 is electrically connected to the first electrode 11a of the corresponding light emitting device 11 through a connection line. The output terminal of the optional second pixel circuit 41 extends in a curved shape or a spiral shape and is electrically connected to the first electrode 11a of the corresponding light emitting device 11.
Alternatively, referring to fig. 6, the bending region 23 includes a connection film layer 6, where the connection film layer 6 has a plurality of transmission lines arranged in an insulating manner, and the plurality of transmission lines and the plurality of second pixel circuits 41 are respectively arranged correspondingly; a first end of the transmission line is electrically connected to an output end of one of the second pixel circuits 41, and a second end of the transmission line is electrically connected to the first electrode 11a of the light emitting device 11 corresponding to the second pixel circuit 41.
In this embodiment, the second pixel circuit 41 is connected to the corresponding light emitting device 11 through the connection film layer 6, and the output terminal lead of the second pixel circuit 41 is short, and will not break when bending, and the connection film layer 6 has large stress, which can effectively prevent the transmission line from breaking, thereby prolonging the service life of the flexible display panel.
Referring to fig. 7, another flexible display panel according to an embodiment of the present invention is shown, and fig. 7 is a cross-sectional view taken along a-a' of fig. 1. The flexible display panel provided by the embodiment of the invention comprises: a light emitting device layer 1, the light emitting device layer 1 including a plurality of light emitting devices 11; the display area 2, the display area 2 includes at least one first display area 21 and second display area 22 and a bending area 23 located between the first display area 21 and the second display area 22, and also includes a first pixel circuit layer 3 and a second pixel circuit layer 4, the first pixel circuit layer 3 is located between the light-emitting device layer 1 and the second pixel circuit layer 4; the first pixel circuit layer 3 and the second pixel circuit layer 4 are disposed at the bending region 23 and drive the light emitting device 11 of the bending region 23.
The same structure of the flexible display panel shown in fig. 7 and fig. 2 is not described in detail here. In the flexible display panel shown in fig. 7, the bending region 23 is provided with two pixel circuit layers, namely a first pixel circuit layer 3 and a second pixel circuit layer 4, the first pixel circuit layer 3 is used for driving part of the light emitting devices 11 in the bending region 23, and the second pixel circuit layer 4 is used for driving the rest of the light emitting devices 11 in the bending region 23.
In this embodiment, the display region 2 further includes a first display region 21 and a second display region 22, and the first display region 21 and the second display region 22 may be selected to be of a single-layer structure, for example, the first pixel circuit layer 3 is further located in the first display region 21 to be electrically connected to each light emitting device 11 of the first display region 21, and the first pixel circuit layer 3 is further located in the second display region 22 to be electrically connected to each light emitting device 11 of the second display region 22.
It is understood that the first pixel circuit layer 3 includes a plurality of first pixel circuits, which are respectively disposed and electrically connected to the light emitting devices 11 of the bending region 23, and specifically, the output terminals of the first pixel circuits are directly electrically connected to the corresponding light emitting devices 11. The second pixel circuit layer 4 includes a plurality of second pixel circuits, which are respectively disposed and electrically connected to the remaining light emitting devices 11 of the bending region 23, and specifically, the output ends of the second pixel circuits extend in a bending manner and are electrically connected to the corresponding light emitting devices 11 through the first pixel circuit layer 3.
The flexible display panel can be folded in the bending area 23, so that a right angle or other non-0 angle is formed between the first display area 21 and the second display area 22, at this time, the flexible display panel controls the light emitting device 11 of the bending area 23 to emit light and display an image through the first pixel circuit layer 3 and the second pixel circuit layer 4, and the flexible display panel also controls the light emitting device 11 of the first display area 21 and the second display area 22 to emit light through other pixel circuits, so that normal display of the display area 2 is realized.
First pixel circuit layer 3 and second pixel circuit layer 4 are located different layers, so the interval of two adjacent pixel circuits of bending region 23 on flexible display panel horizontal direction can be accomplished comparatively big, can avoid the extrusion between two adjacent pixel circuits when buckling, solved the pixel circuit damage problem that the extrusion caused between the base plate, guaranteed that the display effect in display area is normal. In addition, the pixel circuits in the bending region are divided into two layers, in other embodiments, the pixel circuits are located in the same layer, so that the thickness of the bending region is locally increased, but the thickness of the whole display panel is not increased after bending. The flexible display panel that this embodiment provided not only is applicable to the intelligent terminal screen, can also be used to other flexible equipment, like multiaspect screen electronic alarm clock, multiaspect screen electronic album multiaspect dysmorphism display screen such as.
Optionally, the first pixel circuit layer and the second pixel circuit layer are both disposed in the bending region, the first pixel circuit layer includes a plurality of first pixel circuits, and the second pixel circuit layer includes a plurality of second pixel circuits; the first pixel circuit and the second pixel circuit are arranged at intervals and do not overlap in orthographic projection of the plane where the light-emitting device layer is located.
Referring to fig. 7 and 8, the first pixel circuits 31 and the second pixel circuits 41 do not overlap in the orthogonal projection of the plane where the light emitting device layer 1 is located and are spaced apart in the first direction, then the distance between two first pixel circuits 31 adjacently located in the first direction in the bending region 23 is at least larger than the size of one pixel circuit, when the second direction is taken as the bending axis, the extrusion between two adjacent first pixel circuits 31 in the same layer can be avoided, and similarly, the distance between two adjacent second pixel circuits 41 in the bending region 23 along the first direction is at least larger than the size of one pixel circuit, when the second direction is taken as the bending axis for bending, extrusion between two adjacent second pixel circuits 41 on the same layer can be avoided, the problem of pixel circuit damage caused by extrusion between substrates is solved, and the normal display effect of the bending area of the display area is ensured.
Optionally, the plurality of first pixel circuits of the first pixel circuit layer and the plurality of second pixel circuits of the second pixel circuit layer are arranged in an array in the orthographic projection of the light emitting device layer; the pixel circuits in the same row in the orthographic projection of the plane where the light-emitting device layer is located belong to the same pixel circuit layer, and the pixel circuits in two adjacent rows in the orthographic projection of the plane where the light-emitting device layer is located belong to different pixel circuit layers; or the pixel circuits in the same column of the orthographic projection of the plane in which the light-emitting device layer is located belong to the same pixel circuit layer, and the pixel circuits in the two adjacent columns of the orthographic projection of the plane in which the light-emitting device layer is located belong to different pixel circuit layers; or two pixel circuits which are adjacently arranged in the orthographic projection of the plane where the light-emitting device layer is located belong to different pixel circuit layers.
Fig. 8 is a schematic diagram showing orthographic projections of the first pixel circuit layer and the second pixel circuit layer on a plane where the light emitting device layer is located. The first direction may be a row direction, and the second direction may be a column direction, and obviously, the plurality of first pixel circuits 31 of the first pixel circuit layer 3 are arranged in a plurality of columns, the plurality of second pixel circuits 41 of the second pixel circuit layer 4 are arranged in a plurality of columns, and the columns of the first pixel circuits 31 and the columns of the second pixel circuits 41 are distributed at intervals in the row direction. The first pixel circuit 31 and the second pixel circuit 41 are located in different pixel circuit layers, and thus no compression occurs between the first pixel circuit 31 and the second pixel circuit 41. The distance between two adjacent columns of first pixel circuits 31 is at least larger than the size of one second pixel circuit 42, so that the extrusion between two adjacent first pixel circuits 31 in the row direction can be avoided when the column direction is taken as a bending shaft for bending, and similarly, the extrusion between two adjacent second pixel circuits 41 in the row direction can be avoided when the column direction is taken as the bending shaft for bending, so that the problem of pixel circuit damage caused by extrusion between substrates is solved, and the normal display effect of the bending area of the display area is ensured.
As shown in fig. 9, the plurality of first pixel circuits 31 of the first pixel circuit layer 3 are arranged in a plurality of rows, the plurality of second pixel circuits 41 of the second pixel circuit layer 4 are arranged in a plurality of rows, and the rows of the first pixel circuits 31 and the rows of the second pixel circuits 41 are spaced apart in the column direction. The first pixel circuit 31 and the second pixel circuit 41 are located in different pixel circuit layers, and thus no compression occurs between the first pixel circuit 31 and the second pixel circuit 41. The distance between two adjacent rows of first pixel circuits 31 is at least larger than the size of one second pixel circuit 42, so that the extrusion between the same layer and two adjacent first pixel circuits 31 can be avoided when the column direction is taken as the bending axis for bending, and similarly, the extrusion between the same layer and two adjacent second pixel circuits 41 can be avoided when the column direction is taken as the bending axis for bending, thereby solving the problem of pixel circuit damage caused by extrusion between substrates and ensuring the normal display effect of the bending area of the display area.
As shown in fig. 10, the pixel circuits adjacent to the first pixel circuit 31 are all the second pixel circuits. The first pixel circuit 31 and the second pixel circuit 41 are located in different pixel circuit layers, and thus no compression occurs between the first pixel circuit 31 and the second pixel circuit 41. This flexible display panel can be followed arbitrary direction and buckled in the district of buckling, then the interval between two adjacent first pixel circuits 31 is greater than a second pixel circuit 42's size at least, can avoid the extrusion between two adjacent first pixel circuits 31 with the layer when buckling so, and on the same way, also can avoid the extrusion between two adjacent second pixel circuits 41, the pixel circuit damage problem that the extrusion led to the fact between the base plate has been solved, the bending property has been improved, the district of buckling display effect of having guaranteed the display area is normal, arbitrary curved surface screen has been realized.
It is understood that the pressing force between the adjacent pixel circuits in the bending axis direction is very small and negligible.
Optionally, as shown in fig. 11, the flexible display panel further includes: a first substrate 5 on which the pixel circuit is located 5; the first pixel circuits 31 of the first pixel circuit layer are disposed on the first substrate 5 through the pads 51, and the second pixel circuits 41 of the second pixel circuit layer are disposed on the first substrate 5.
In this embodiment, the first substrate 5 of the flexible display panel is a flexible material layer, the first substrate 5 may be a polyimide substrate with good ductility, and in other embodiments, the first substrate may also be a flexible material substrate suitable for application in a display panel, such as an organic film with good ductility, without being limited thereto. The first substrate 5 is provided with a pad 51, the first pixel circuit 31 is provided on the substrate 51, and the second pixel circuit 41 is provided on the first substrate 5, so that the first pixel circuit 31 and the second pixel circuit 41 are located on planes having different heights, and the first pixel circuit layer and the second pixel circuit layer are formed on different layers. Optional liner 51 is integrally formed on first substrate 5, and in other embodiments, the first substrate and liner may optionally be formed separately. Therefore, under the condition of ensuring high PPI, the distance between the pixel circuits on the same layer is increased, so that the pixel circuits are prevented from being damaged by extrusion between the substrates during bending, and the bending performance is improved.
Optionally, as shown in fig. 11, the pixel circuit includes a thin film transistor, where the thin film transistor includes a source/drain and a gate; the source-drain metal layer of the first pixel circuit 31 and the source-drain metal layer of the second pixel circuit 41 are manufactured by the same process, and the gate metal layer of the first pixel circuit 31 and the gate metal layer of the second pixel circuit 41 are manufactured by the same process.
In the present embodiment, the source and drain metal layers of the first pixel circuit 31 and the second pixel circuit 41 may be selected by using the same process, and the gate metal layer of the first pixel circuit 31 and the gate metal layer of the second pixel circuit 41 are manufactured by using the same process.
Optionally, the light emitting device 11 includes a first electrode 11a, a light emitting material layer 11b, and a second electrode 11c, and the second electrode 11c is shared by the plurality of light emitting devices 11 in the bending region; the output end of the second pixel circuit 41 is bent and extended and electrically connected to the first electrode 11a of the corresponding light emitting device 11.
In this embodiment, the first pixel circuit 31 is located on the pad 51, the second pixel circuit 41 is located on the first substrate 5, and the first pixel circuit 31 and the second pixel circuit 41 are disposed at an interval, so that when the output terminal of the second pixel circuit 41 is electrically connected to the first electrode 11a of the corresponding light emitting device 11, the connection can be bent and extended, for example, the first electrode 11a is electrically connected to the output terminal of the corresponding pixel circuit in a spiral or curved shape. The output end lead of the second pixel circuit 41 is bent and extended, so that the flexible display panel has better ductility and is not easy to break, and the service life of the flexible display panel is prolonged.
The flexible display panel provided by the embodiment of the invention can be suitable for display panels with different bending forms, wherein the flexible display panel can comprise a plurality of first display areas and second display areas, and a bending area is arranged between the adjacent first display areas and the second display areas; or, the whole surface of the flexible display panel is a bending area. The pixel circuit structure of the bending area of the flexible display panel is of a double-layer structure, the distance between two adjacent pixel circuits on the same layer is large when the flexible display panel is bent, so that the extrusion force is small, the bending performance is improved, the problem that the panel cannot be restored to be damaged due to extrusion when the flexible display panel is bent is also solved, and the product yield and the display effect are improved.
Based on the same inventive concept, embodiments of the present invention further provide an electronic device, which includes the flexible display panel according to any of the above embodiments. The electronic device can be selected as a smart watch, a smart phone, a multi-screen electronic alarm clock and the like, and is not particularly limited in the present invention. It can be understood that the drawings shown in the above embodiments are only simple schematic diagrams of the flexible display panel, and the structure of the flexible display panel substantially includes other film layers, which are not described and defined herein.
The electronic device provided by the embodiment integrates the flexible display panel described in the above embodiments, has a function of switching the display area of the size at will, and can also improve the bending performance, improve the problems of substrate damage and the like caused by bending extrusion, and improve the display effect.
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 (10)
1. A flexible display panel, comprising:
a light emitting device layer including a plurality of light emitting devices;
the display device comprises a display area, a first pixel circuit layer and a second pixel circuit layer, wherein the display area comprises at least one first display area, at least one second display area, a bending area between the first display area and the second display area, and a first pixel circuit layer and a second pixel circuit layer, and the first pixel circuit layer is positioned between the light-emitting device layer and the second pixel circuit layer;
the first pixel circuit layer is arranged in the first display area and drives the light emitting device of the first display area, and the second pixel circuit layer is arranged in the first display area and drives the light emitting device of the second display area; or, the first pixel circuit layer and the second pixel circuit layer are disposed in the bending region and drive the light emitting device of the bending region.
2. The flexible display panel according to claim 1, wherein the first pixel circuit layer and the second pixel circuit layer are each provided in the bending region, the first pixel circuit layer includes a plurality of first pixel circuits, and the second pixel circuit layer includes a plurality of second pixel circuits;
the orthographic projections of the first pixel circuit and the second pixel circuit on the plane where the light-emitting device layer is located are not overlapped and are arranged at intervals.
3. The flexible display panel according to claim 2, wherein the plurality of first pixel circuits of the first pixel circuit layer and the plurality of second pixel circuits of the second pixel circuit layer are arranged in an array in an orthogonal projection of the light emitting device layer; wherein the content of the first and second substances,
the pixel circuits in the same row in the orthographic projection of the plane where the light-emitting device layer is located belong to the same pixel circuit layer, and the pixel circuits in two adjacent rows in the orthographic projection of the plane where the light-emitting device layer is located belong to different pixel circuit layers; or the pixel circuits in the same column of the orthographic projection of the plane where the light-emitting device layer is located belong to the same pixel circuit layer, and the pixel circuits in the two adjacent columns of the orthographic projection of the plane where the light-emitting device layer is located belong to different pixel circuit layers; or two pixel circuits which are adjacently arranged in the orthographic projection of the plane where the light-emitting device layer is located belong to different pixel circuit layers.
4. The flexible display panel of claim 2, further comprising: a first substrate on which the pixel circuit is located;
the first pixel circuits of the first pixel circuit layer are disposed on the first substrate through pads, and the second pixel circuits of the second pixel circuit layer are disposed on the first substrate.
5. The flexible display panel of claim 4, wherein the pixel circuit comprises a thin film transistor comprising a source drain and a gate;
the source and drain metal layers of the first pixel circuit and the source and drain metal layers of the second pixel circuit are manufactured by the same process, and the grid metal layer of the first pixel circuit and the grid metal layer of the second pixel circuit are manufactured by the same process.
6. The flexible display panel according to claim 4, wherein the light emitting device comprises a first electrode, a light emitting material layer, and a second electrode, the second electrode being shared by a plurality of light emitting devices of the bending region;
the output end of the second pixel circuit is bent and extended and is electrically connected with the first electrode of the corresponding light-emitting device.
7. The flexible display panel according to claim 1, wherein the first pixel circuit layer is provided in the first display region and drives a light emitting device of the first display region, and wherein the second pixel circuit layer is provided in the first display region and drives a light emitting device of the second display region;
in the folding display stage, the second display area is arranged in contact with the first display area, the second display area does not display and is switched into a transparent state to display in the first display area;
in the unfolding display stage, the second display area, the bending area and the first display area are positioned on the same plane, and the second display area and the first display area are displayed simultaneously.
8. The flexible display panel according to claim 7, wherein the light emitting device comprises a first electrode, a light emitting material layer, and a second electrode, and the second electrode is shared by a plurality of light emitting devices of the second display region;
the first pixel circuit layer comprises a plurality of first pixel circuits, the second pixel circuit layer comprises a plurality of second pixel circuits, and output ends of the second pixel circuits are electrically connected with the first electrodes of the corresponding light-emitting devices.
9. The flexible display panel according to claim 8, wherein the bending region includes a connection film layer having a plurality of transmission lines provided in an insulating manner, the plurality of transmission lines being provided corresponding to the plurality of second pixel circuits, respectively;
a first end of the transmission line is electrically connected to an output end of one of the second pixel circuits, and a second end of the transmission line is electrically connected to a first electrode of the light emitting device corresponding to the second pixel circuit.
10. An electronic device, characterized in that it comprises a flexible display panel according to any one of claims 1-9.
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| CN110993680B (en) | 2022-06-17 |
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