CN117826501A - Display panel, manufacturing method and display device - Google Patents
Display panel, manufacturing method and display device Download PDFInfo
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- CN117826501A CN117826501A CN202410008910.8A CN202410008910A CN117826501A CN 117826501 A CN117826501 A CN 117826501A CN 202410008910 A CN202410008910 A CN 202410008910A CN 117826501 A CN117826501 A CN 117826501A
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field
- G02F1/1685—Operation of cells; Circuit arrangements affecting the entire cell
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field
- G02F1/166—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
- G02F1/167—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
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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
- G09F9/37—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 being movable elements
- G09F9/372—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 being movable elements the positions of the elements being controlled by the application of an electric field
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention discloses a display panel, a manufacturing method and a display device. The display panel of one embodiment comprises a substrate and a driving substrate arranged on the substrate, wherein the driving substrate comprises a display area and a non-display area at least surrounding part of the display area, and the non-display area comprises: the binding area is provided with a connecting terminal; and a transition area which is positioned at one side of the binding area far away from the display area, wherein a metal film layer is not arranged on the film layer of the transition area. According to the embodiment of the invention, the transition area is additionally arranged on one side, far away from the display area, of the binding area in the non-display area of the driving substrate, and the metal layer is not arranged on the film layer of the transition area, so that micro stripping or damage of the edge film layer of the cutting line is solved, and the defects of electrode separation and abnormal display caused by expansion of the film layer stripping area in the subsequent crimping process can be solved.
Description
Technical Field
The invention relates to the technical field of display. And more particularly, to a display panel, a manufacturing method, and a display device.
Background
An electrophoretic Display (EPD) is a mainstream electronic paper Display technology that does not emit light itself, relies on natural light reflection imaging, and is bistable to maintain a static image without using electricity, and has the advantages of energy saving, environmental protection, and the like. Compared with the traditional electronic paper display device, the flexible substrate of the flexible electronic paper display replaces the glass substrate of the traditional electronic paper display, and has the characteristics of flexibility, bending and uneasiness in breaking.
In the related art, a small-piece module and then a laser stripping scheme is adopted in the manufacturing of the flexible electronic display device, and when a cutter wheel is adopted to cut a composite film layer of the electronic paper display module during the composite laser cutting equipment, micro-separation defects are easily generated between film layers in the nearby area due to transverse extrusion of the film layers at two sides of a cutting line. Further, under the high temperature and high pressure process in the crimping process of the driving circuit board of the subsequent module, the interlayer separation defect is expanded to the whole driving circuit crimping area, so that the film layer of the crimping area is peeled off and remains on the final display product to form the product defect.
Disclosure of Invention
The invention aims to provide a display panel, a manufacturing method and a display device, which are used for solving at least one of the problems existing in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a first aspect of the present invention provides a display panel comprising a substrate and a drive substrate disposed on the substrate, the drive substrate comprising a display region and a non-display region surrounding at least part of the display region,
the non-display area includes:
the binding area is provided with a connecting terminal; and
and the film layer of the transition area is not provided with a metal film layer.
Optionally, the direction from the display area to the transition area is a first direction, a second direction is perpendicular to the first direction,
in the second direction, the number of film layers of the transition region of at least a portion of the region is less than the number of film layers of the binding region.
Further, the film layer of the binding region comprises an organic layer, an inorganic layer and a metal layer forming the connecting terminal;
the film layer of the transition zone comprises one or more layers of organic layers or inorganic layers, and the substrate is one of the organic layers.
Optionally, the connection terminals of the binding area are sequentially arranged along the second direction,
a first distance is reserved between a terminal boundary of the binding area, which is far away from the display area, and a first boundary of the transition area, which is close to the display area;
the display panel takes the area, away from the display area, of the first boundary as a bending area, and is folded to the surface, away from the driving substrate, of the substrate.
Optionally, at least part of the area of the transition area comprises at least one first groove extending along the second direction, and the film layer at the corresponding position of the first groove comprises one or more layers of organic layers or inorganic layers;
in the second direction, the first groove extends to a length that covers at least the furthest distance between the two connection terminals that are furthest from each other.
Optionally, the width of the first groove in the first direction is a groove width, and the groove width is 5 μm to 10 μm:
the distance between the boundary of the groove body on one side of the first groove close to the display area and the boundary of the transition area on one side of the transition area far away from the display area is the width of the transition area, and the width of the transition area is 0.5-5 mm.
Optionally, the film layer of the whole area of the transition zone comprises one or more layers of organic layers or inorganic layers;
the distance between the first boundary of the transition area, which is close to one side of the display area, and the boundary of the transition area, which is far away from one side of the display area, is the width of the transition area, and the width of the transition area is larger than the aperture of the switching hole of the binding area.
Optionally, the aperture of the photoresist used to form the via hole located in the bonding area is smaller than the aperture of the photoresist used to form the via hole located in the display area.
Optionally, the binding area further includes a second groove, the second groove is located between a boundary of a side, close to the display area, of the binding area, and a boundary of a side, close to the binding area, of the display area, the film layer at a position corresponding to the second groove includes a metal film layer, so as to connect the driving substrate and the connecting terminal of the binding area, and the second groove extends along the second direction and penetrates through an opposite boundary, extending along the first direction, of the display module.
Optionally, the display panel uses a second boundary of the second groove near the side of the display area as a bending area, and is folded to a surface of the substrate away from the side of the driving substrate.
Optionally, the display panel further includes an electronic paper layer disposed on the driving substrate, and a driving circuit board connected to the driving substrate, where the connection terminal is used to connect to the driving circuit board.
Optionally, the display module further includes a driving chip, the connection terminal is further connected to the driving chip, and the driving chip is located in the binding area, and the driving circuit board is close to one side of the display area.
Optionally, the display panel further includes a protective layer, which is located on a surface of the film layer at the position of the transition region and/or the binding region, which is far away from the substrate, and the orthographic projection of the protective layer on the substrate is not overlapped with the orthographic projection of the driving circuit board or the driving chip on the substrate.
A second aspect of the present invention provides a display device comprising the display panel according to the first aspect of the present invention.
A third aspect of the present invention provides a method of manufacturing a display panel, the method comprising:
forming a substrate arranged in an array on a glass substrate;
forming driving substrates on the substrates, respectively;
cutting a plurality of driving substrates, wherein the driving substrates comprise a display area and a non-display area surrounding the display area, and the non-display area comprises: the display device comprises a binding area provided with a connecting terminal and a transition area positioned at one side of the binding area far away from the display area, wherein a metal film layer is not arranged on the film layer of the transition area.
The beneficial effects of the invention are as follows:
in the embodiment of the invention, the transition area is additionally arranged on one side of the binding area in the non-display area of the driving substrate, which is far away from the display area, and the film layer of the transition area is not provided with the metal layer, so that the problem of micro-peeling or damage of the edge film layer of the cutting line is solved, and the defects of electrode separation and abnormal display caused by the expansion of the film layer peeling area in the subsequent crimping process can be solved.
Drawings
The following describes the embodiments of the present invention in further detail with reference to the drawings.
Fig. 1 is a schematic view showing a defect that a cutting area of a display panel of the related art is separated by a film layer and expanded toward a bonding area;
fig. 2 is a schematic top view of a display panel according to an embodiment of the present invention;
FIG. 3 is a schematic top view of a non-display area of a display panel according to an embodiment of the invention;
FIG. 4 illustrates a side structural schematic view of the display panel shown in FIG. 2;
FIGS. 5 and 6 show schematic top view of non-display areas of the display panel;
FIG. 7 shows a schematic top and side view of a transition zone of another embodiment of the present invention;
FIG. 8 shows a schematic top view of a transition zone according to another embodiment of the present invention;
fig. 9 shows a layer structure diagram of a transition zone according to an embodiment of the invention.
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be further described with reference to examples and drawings. Like parts in the drawings are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.
In the related art, a small-chip module and then a laser peeling scheme is adopted in the manufacturing of the flexible electronic display device, and when a knife flywheel is adopted to cut a composite film layer of the electronic paper display module during the composite laser cutting equipment, as shown in fig. 1, micro-separation defects are easily generated between film layers in the nearby area due to transverse extrusion of the film layers at two sides of a cutting area. Further, under the high temperature and high pressure process in the crimping process of the driving circuit board of the subsequent module, the interlayer separation defect is expanded to the binding crimping area of the whole driving circuit, so that the film layer of the binding crimping area is peeled off and remains on the final display product to form the product defect.
In view of the above, a first embodiment of the present invention provides a display panel, a manufacturing method and a display device for solving the above-mentioned problems.
A first embodiment of the present invention proposes a display panel, as shown in fig. 2 and 3, comprising a substrate 11 and a driving base plate 12 provided on said substrate 11, said driving base plate 12 comprising a display area AA and a non-display area NA surrounding at least part of said display area AA,
the non-display area NA includes:
a binding area NA01 provided with a connection terminal 121; and
and a transition area NA02 positioned at one side of the binding area NA01 far from the display area AA, wherein a metal film layer is not arranged on the film layer of the transition area NA02.
In the embodiment of the invention, the bonding area NA01 in the non-display area NA of the driving substrate 12 is additionally provided with the transition area NA02 at one side far away from the display area AA, and the film layer of the transition area NA02 is not provided with the metal layer, so that the problem of micro stripping or damage of the edge film layer of the cutting line is solved, and the defects of electrode separation and abnormal display caused by the expansion of the film layer stripping area in the subsequent crimping process can be solved.
In this embodiment, the substrate 11 is a flexible substrate, and the material thereof may be yellow polyimide, which refers to an organic polymer material having an imide ring on its main chain and having a golden or yellow appearance. The yellow polyimide has the advantages of good chemical stability, high temperature resistance, low temperature resistance, chemical corrosion resistance, good mechanical property and the like.
In this embodiment, the display panel is an electronic paper display panel, and display is realized by using an electrophoretic display technology. In an alternative embodiment, as shown in fig. 2 and 4, the display panel further includes an electronic paper layer 13 disposed on the driving substrate 12, and a driving circuit board 14 connected to the driving substrate 12, and the connection terminals 121 are used to connect the driving circuit board 14.
In an alternative embodiment, the display module further includes a driving chip, and the connection terminal 121 is further connected to the driving chip, where the driving chip is located on a side of the driving circuit board 14 in the binding area NA01, which is close to the display area AA.
Fig. 2 shows a schematic top view of a display panel according to an embodiment of the present invention, fig. 3 shows a structural design of a non-display area NA, and fig. 4 shows a schematic test surface of the display panel according to an embodiment of the present invention.
In this embodiment, the display panel mainly comprises a substrate 11, a driving substrate 12 disposed on the substrate 11, and an electronic paper layer 13 disposed on the driving substrate 12, where the substrate 11 is a flexible substrate, and the substrate 11 is disposed on a back plate protection layer 15 with good support property to play a role in supporting the substrate 11. The driving substrate 12 includes driving electrode layers disposed on the substrate 11 and disposed in the display area AA and the non-display area NA. The electronic paper layer 13 comprises a particle layer of tens of thousands of oppositely charged black and white ions or color particles encapsulated in spherical or cup-shaped micro-communication capsules or cavities, and an encapsulated electrode layer (not identified in fig. 4) arranged on the side of the particle layer away from the substrate 11, wherein when positive and negative electric fields are formed between the driving electrode layer and the encapsulated electrode layer, the particles of each color can be driven to move to the surface of the particles on the side away from the substrate 11 respectively, and corresponding color patterns are generated through absorption or reflection.
The display substrate further comprises a second protective layer, illustratively, as shown in fig. 4, the second protective layer 16 comprises a side protective layer 161 surrounding the display area AA and a front protective layer 162 covering the electronic layer for protecting the electronic paper layer 13.
The display panel of the embodiment of the present invention further includes a peripheral driving circuit, for example, a driving circuit board 14 connected to the display panel, and for example, a driving chip 18 connected to the display panel, as shown in fig. 3, the connection between the driving substrate 12 and the driving chip 18 in the embodiment is located in the binding area NA01, and the connection area between the driving substrate 12 and the driving chip 18 is also located in the binding area NA01. As shown in fig. 3, the connection area corresponding to the driving chip 18 is closer to the display area AA than the driving circuit board 14, and the binding area NA01 in the non-display area NA is used to connect the driving substrate 12 and different electronic components.
It should be noted that, in the display panel of the present embodiment, the driving chip 18 is designed according to a person skilled in the art, that is, as shown in fig. 3, the display panel may not be provided with the driving chip 18, but only the driving circuit board 14, and the driving circuit board 14 and the driving substrate 12 perform signal transmission and data processing.
In an alternative embodiment, as shown in fig. 9, the display panel further includes a first protection layer 17, which is located on a surface of the film layer at the position of the transition area NA02 and/or the binding area NA01, which is far away from the substrate 11, and the front projection of the first protection layer 17 on the substrate 11 does not overlap with the front projection of the driving circuit board 14 or the driving chip 18 on the substrate 11.
The first protection layer 17 according to the embodiment of the present invention is disposed in the transition area NA02 and the binding area NA01 except for the driving circuit board 14 and the driving chip 18, that is, the first protection layer 17 is not disposed on the surfaces of the driving circuit board 14 and the driving chip 18 on the side away from the substrate 11, so that the first protection layer 17 is prevented from affecting the electrical connection performance between the metal pads of the driving circuit board 14 and the driving chip 18 and the connection terminals 121.
The first protective layer 17 of the present embodiment has a corresponding design according to the design of the transition area NA02 and the film layer structure of the transition area NA02, and is described in the following embodiments.
In an alternative embodiment, the direction from the display area AA to the transition area NA02 is a first direction, and the second direction is perpendicular to the first direction, that is, the vertical direction is the first direction, and the lateral direction is the second direction as shown in fig. 2.
In this embodiment, in the second direction, the number of film layers of the transition area NA02 of at least a part of the area is smaller than the number of film layers of the binding area NA01.
Through the arrangement of this embodiment, the number of the layers of the transition area NA02 is reduced, that is, at least a part of the area described in this embodiment, that is, the whole area of the transition area NA02 may be reduced, and the part of the area of the transition area NA02 may be reduced, so that the flexibility of the transition area NA02 is better than that of the binding area NA01, and, because the transition area NA02 of this embodiment is not provided with a metal film, on one hand, the electrical connection performance of this embodiment is not affected, on the other hand, the transition area NA02 is not provided with a metal film, so that the flexibility of the transition area NA02 is further improved, the bending performance of the transition area NA02 is improved, and the narrow frame design is facilitated.
In an alternative embodiment, as shown in fig. 9, the film layer of the binding area NA01 includes an organic layer (for example, the substrate 11 made of an organic material), an inorganic layer 112, and a metal layer forming the connection terminal 121, and in this embodiment, the film layer of the binding area NA01 is a laminated structure of a hybrid design of the organic layer and the inorganic layer, and the structure has a flexible function of the organic layer and a function of preventing intrusion of vapor of the inorganic layer, so that the binding area NA01 of the display panel has higher reliability.
In the actual process, the film layer of the bonding area NA01 and the film layer of the transition area NA02 are arranged in the same layer, the subtracted film layer of the transition area NA02 and the rest film layer of the transition area NA02 can be formed on the substrate 11 by the same process, wherein when the metal layer of the transition area NA02 is manufactured, the metal film layer is not formed in the transition area NA02, and then the redundant film layer is removed by etching and other processes, so that the formed film layer of the transition area NA02 comprises one or more layers of an organic layer or an inorganic layer, that is, the film layer of the transition area NA02 can be subtracted to comprise only the organic layer, can also be subtracted to comprise only the inorganic layer, and can also be subtracted to comprise a mixed film layer of the organic layer and the inorganic layer, and the number of the mixed film layer of the organic layer and the inorganic layer is less than that of the mixed film layer of the bonding area NA01, so that the flexibility of the transition area NA02 is superior to that of the bonding area NA01.
Illustratively, when the film layer of the transition region NA02 comprises only an organic layer, the organic layer has good flexibility, and in an alternative embodiment, the substrate 11 is one of the organic layers. That is, the design of reducing the number of film layers in the first groove 122 according to the embodiment of the present invention may not design any film layer except the substrate 11 at the position of the first groove 122, so as to achieve the design of the optimum bending performance at the first groove 122.
In a preferred embodiment, as shown in fig. 9, the film layer of the transition area NA02 is a mixed layer structure design of an organic layer (substrate 11 of organic material) and an inorganic layer 112. Compared with the structural design of an organic layer, the device has the advantages that the reliability of the NA02 transition area is improved by utilizing the strong water-oxygen resistance of the inorganic layer, and the water-oxygen erosion is avoided.
In an alternative embodiment, as shown in fig. 3, the connection terminals 121 of the binding area NA01 are sequentially arranged along the second direction, and a first distance a is provided between a terminal boundary of the binding area NA01 on a side far from the display area AA and a first boundary of the transition area NA02 on a side near to the display area AA.
In this embodiment, the first distance a is 0.05mm to 0.3mm, and the lower limit value amin of the value of the first distance a is 1.0 to 1.5 μm, which is limited by the patterning process deviation capability to ensure that the connection terminal 121 of the binding area NA01 does not leak. On the other hand, the upper limit amax of the first distance a needs to consider the maximum value of the lower frame value required by the terminal, and the first distance is too large to affect the beauty of the display panel and the frame size. In summary, the value of the first distance a ranges from a lower limit value amin to an upper limit value amax, and is preferably 0.05mm to 0.3mm.
As shown in fig. 4, the display panel uses a region of the first boundary, which is far from the display area AA, as a bending region 1221, and is folded to a surface of the substrate 11, which is far from the driving substrate 12. In this embodiment, the transition area NA02 is designed to have flexibility by reducing the film layer in the transition area NA02, so that the transition area NA02 has better bending performance, a bending area is set in the transition area NA02, the bending area 1221 is used to bend towards the non-light-emitting side, and the substrate 11 is attached to the back surface of the driving substrate 12 through the adhesive 19, as shown in fig. 4, exemplary, a back plate protection layer 15 is set on the side of the substrate 11 away from the driving substrate 12, the edge of the back plate protection layer 15 is cut off in the bending area of the transition area NA02, that is, as shown in fig. 4, the substrate 11 covers the back plate protection layer 15, and the transition area NA02 in a tiled state (in an unbent state) is not provided with the back plate protection layer 15, so that the bending performance of the transition area NA02 is further improved, and other film layers of the transition area NA02 are bent to the non-light-emitting side, as shown in fig. 2, the cut area is added in the state, and film layer separation of the binding area NA01 during cutting can be avoided, as shown in fig. 4, the transition area NA02 is increased to the non-light-emitting side, and the display panel is designed to have a narrow frame, and the frame is not designed, and the frame is required to be displayed.
Further, the embodiment of the invention provides different design schemes for improving flexibility of the transition area NA02.
As shown in fig. 3, at least a part of the transition area NA02 includes at least one first groove 122 extending along the second direction, the film layer at the corresponding position of the first groove 122 includes one or more of an organic layer or an inorganic layer, and the substrate 11 is one of the organic layers.
As shown in fig. 2 and 3, the transition area NA02 includes the first groove 122 region where the film is reduced and the non-subtractive region 123 where the film is not subtractive.
The design of reducing the number of film layers of the first groove 122 according to the embodiment of the present invention may not design any film layer except the substrate 11 at the position of the first groove 122, so as to realize the design of the optimum bending performance at the position of the first groove 122.
On the basis of the foregoing embodiment of the present invention, the first protective layer 17 is coated on each surface of the first groove 122, thereby improving the overall strength and reliability at the position of the first groove 122.
The extending direction of the first grooves 122 and the extending direction of the connecting terminals 121 in this embodiment are the same, and are both arranged in the lateral direction as shown in fig. 3, in this embodiment, the first grooves 122 located in the transition area NA02 are arranged to have a reduced number of film layers, that is, the number of film layers at the position of the non-subtractive area 123 (non-first grooves 122) in the transition area NA02 is greater than the number of film layers at the position of the first grooves 122, that is, the bending performance of the first grooves 122 is higher than the bending performance at the non-subtractive area 123 in the transition area NA02. Therefore, the first groove 122 is used as a bending area, and after being folded, a bending structure as shown in fig. 4 is formed, so that a narrow frame design is realized.
In an alternative embodiment, as shown in fig. 3 and 5, in the second direction, the first groove 122 extends to a length that covers at least the furthest distance between the two connection terminals 121 that are furthest apart.
As shown in fig. 3, the first grooves 122 of the present embodiment penetrate through opposite boundaries of the display panel, as shown in fig. 5, the first grooves 122 do not penetrate through opposite boundaries of the display panel, but the length of the first grooves 122 is greater than the whole length of the connection terminals 121, so as to ensure uniformity of stress and bending performance corresponding to the whole area of the connection terminals 121.
As shown in fig. 3 and fig. 5, after the transition area NA02 is added, when the driving substrate 12 is cut, the boundary, parallel to the first recess, of the side, away from the display area AA, of the transition area NA02 is taken as a cutting boundary, that is, the boundary, parallel to the first groove 122, of the side, close to the display area AA, of the transition area NA02 is taken as a bending boundary, the boundary, parallel to the first groove 122, of the side, away from the display area AA, of the transition area NA02 is taken as a cutting boundary, and based on the arrangement of the transition area NA02, the film peeling can be prevented from expanding from the cutting boundary to the binding area NA01, and the first groove 122 can further block the film peeling defect, so that the overall yield of the display panel is improved.
In an alternative embodiment, the width of the first groove 122 in the first direction is a groove width, and the value of the groove width c is 5 μm to 10 μm. In the present embodiment, the lower limit value cmin of the groove width c is related to the patterning process capability limit value, and exemplary processes of the first groove 122 include, but are not limited to, photolithography, 3D printing, etc., and those skilled in the art will not limit the specific manufacturing method of the first groove 122.
In an alternative embodiment, the connection terminal 121 located in the binding area NA01 may be connected between the metal film layers of different layers through a transfer hole, the width of the groove is close to the aperture of the transfer hole located in the binding area NA01, and the transfer hole is used for realizing cross-layer connection between the different metal film layers, and the transfer hole is also included in the display area AA.
The aperture of the transfer hole located in the bonding area NA01 and the transfer hole located in the display area AA is 5 μm to 10 μm, and the groove width c of the first groove 122 is 5 μm to 10 μm, and within this design range, the groove widths of the transfer hole located in the bonding area NA01 and the first groove 122 are the same as much as possible.
In this embodiment, to improve the manufacturing efficiency of the display panel, the first recess 122, the via hole of the display area AA, and the via hole of the bonding area NA01 are formed by the same etching process. Therefore, if the difference between the groove width of the first groove 122 and the size of the aperture value of the transfer hole in each area is larger, the etching gas flow required when the value of the groove width c is too large is larger, so that the etching gas flow of the transfer hole in the binding area NA01 close to the first groove 122 is also larger than the etching gas flow of the transfer hole in the display area AA far from the first groove 122, but because the aperture values of the transfer holes in different areas are the same, the problem that the etching degrees of the transfer holes in the display area AA and the transfer holes in the binding area NA01 are different in the same etching time can occur due to the difference of the etching gas flow in different areas, so that the problem that the transfer holes in the same design size are unbalanced in different areas can occur.
Based on the above consideration, in this embodiment, the groove width of the first groove 122 and the aperture size of the via hole of the bonding area NA01 are set to be approximately the same, so as to avoid the problem of etching difference when the first groove 122 and the via hole are etched by the same etching process.
In an alternative embodiment, as shown in fig. 6, the number of the first grooves 122 is plural, in the transition area NA02, the first grooves 122 are arranged along the first direction, by this arrangement, the overall flexibility of the transition area NA02 is increased, and the arrangement of the first grooves 122 can block the film peeling when the cutting boundary is cut, so as to avoid the film peeling defect from expanding to the binding area NA01 side. In an alternative embodiment, the distance between the boundary of the first groove 122 near the display area AA and the boundary of the transition area NA02 far from the display area AA is the width of the transition area NA02, and the width of the transition area NA02 is 0.5-5 mm.
In the embodiment of the present invention, the lower limit of the width b value of the transition area NA02 is limited by the manufacturing lower limit bmin1 of the crimping process of the driving circuit board 14, and when b is less than or equal to bmin1, a failure condition as shown in fig. 1 occurs.
On the other hand, the width b of the transition area NA02 is too small, and the bending operation is not easy to be performed, and the bonding glue 19 needs to adhere after bending as shown in fig. 4, the cutting size of the bonding glue has a minimum size bmin2, and the lower limit of the width b of the transition area NA02 is selected from the maximum values of bmin1 and bmin 2.
On the other hand, an increase in the width b of the transition area NA02 may result in a decrease in the number of cut pieces, and when the width b of the transition area NA02 is increased to a certain critical value bmax may result in a decrease in the number of cut products, thereby reducing the number of display modules that can be formed in the same manufacturing area. Therefore, the lower limit value of the width b of the transition area NA02 is the maximum value of the lower limit value bmin1 of the manufacturing process of the driving circuit board 14 and the lower limit value bmin2 of the cut size of the bonding paste after bending, and the upper limit value bmax of the width b of the transition area NA02 is determined according to the number of cut pieces, so the b value is preferably 0.5 to 5mm.
Based on the above embodiment, the embodiment of the invention improves the problem of peeling the film layer of the display panel by arranging the mode of reducing the film layer of the partial area, and improves the product reliability of the display panel.
In an alternative embodiment, as shown in fig. 7, the film layer in the whole area of the transition area NA02 includes one or more layers of an organic layer or an inorganic layer, and the substrate 11 is one layer of the organic layer, that is, the embodiment of the present invention reduces the number of film layers in the whole transition area NA02, and may not design any film layer except the substrate 11 at the position of the whole transition area NA02, so as to achieve the design of the best bending performance of the transition area NA02.
Unlike the design of embodiment 1 for reducing the film layer in the partial area of the transition area NA02, embodiment 2 reduces the film layer in the entire area of the transition area NA02, and both the bending performance and flexibility of the transition area NA02 are improved compared with those of embodiment 1.
On the basis of the previous embodiment of the present invention, the side wall position having the film level difference at the boundary between the transition area NA02 and the binding area NA01 and the entire surface of the transition area NA02 are coated with the first protective layer 17, thereby improving the overall strength and reliability of the entire transition area NA02.
Because the bending performance of the transition area NA02 is higher, as shown in the schematic top view structure on the left side of fig. 7, a bending area is formed on one side of the transition area NA02, which is close to the binding area NA01, and after the bending structure is formed, as shown on the right side of fig. 7, a narrow frame design is realized.
As shown in fig. 7, the distance between the first boundary of the transition area NA02 near the display area AA and the boundary of the transition area NA02 far from the display area AA is the width of the transition area NA02, the value of the width b of the transition area NA02 is similar to the foregoing embodiment 1, the lower limit value of the width b of the transition area NA02 needs to consider the manufacturing lower limit value bmin1 and the dicing size bmin2 of the crimping process of the driving circuit board 14, and the upper limit value bmax of the width b of the transition area NA02 is determined according to the number of dicing sheets, and the width b of the transition area NA02 in embodiment 2 is preferably 0.5-5 mm.
In this embodiment, the width of the transition area NA02 is greater than the aperture of the transfer hole of the binding area NA01. Illustratively, the width of the transition zone NA02 is 0.5-5 mm and the aperture of the transfer hole is 5 μm-10 μm, i.e., the width of the transition zone NA02 is much greater than the aperture of the transfer hole of the binding zone NA01.
Similar to the selection principle of the aperture of the via hole and the groove width of the first groove 122 in the foregoing embodiment 1, the film layer corresponding to all the areas of the transition area NA02 in embodiment 2 needs to be etched, so that the size difference between the size of the transition area NA02 and the aperture value of the via hole in each area is large, and the etching gas flow required when the width value of the transition area NA02 is too large is large, so that the etching gas flow of the via hole located in the bonding area NA01 near the transition area NA02 is also larger than the etching gas flow of the via hole located in the display area AA far from the transition area NA02, but because the aperture values of the via holes in different areas are the same, the problem that the etching degree is different occurs in the via hole in the display area AA and the via hole in the bonding area NA01 unbalanced in the same etching time occurs, and the problem that the via hole in the same design size is also occurs in the size of the via hole in different areas.
Therefore, to solve the above-mentioned problem of unbalanced sizes of the via holes of the same design size in different areas, in an alternative embodiment, the aperture of the photoresist used to form the via hole located in the bonding area NA01 is not smaller than the aperture of the photoresist used to form the via hole located in the display area AA.
Based on the problem that the sizes of the transfer holes are unbalanced, because the binding area NA01 is closer to the transition area NA02 than the display area AA, and the film layer to be etched in the transition area NA02 is larger in width, therefore, the etching gas flow rate of the binding area NA01 is larger than that of the display area AA, in the etching process of the transfer holes, patterned photoresist is formed on the uppermost film layer corresponding to the transfer holes, the transfer holes are formed at the positions of the hollowed-out patterns of the photoresist, the photoresist and the film layer at the hollowed-out positions are etched by using etching gas, and in the process of the transfer holes, the hole diameters of the photoresist forming the transfer holes in different areas are designed.
In an alternative embodiment, as shown in fig. 8, the binding area NA01 further comprises a second groove 124,
the second groove 124 is located between a boundary of the connection terminal 121 of the binding area NA01 near the display area AA and a boundary of the display area AA near the binding area NA01, and a film layer at a corresponding position of the second groove 124 includes a metal film layer to connect the driving substrate 12 and the connection terminal 121 of the binding area NA01.
In a specific example, when the display module includes only the driving circuit board 14, the bonding area NA01 includes the connection terminal 121 bonded to the driving circuit board 14, and the second groove 124 is disposed in an area between a boundary of the transition area NA02 near the display area AA and a boundary of the connection terminal 121 near the display area AA. The distance between the boundary of the second groove 124 near the display area AA and the display area AA can be designed with reference to the value of the distance a between the first groove 122 and the binding area NA01, and the distance between the boundary of the second groove 124 far from the display area AA and the boundary of the binding area NA01 near the display area AA can also be designed with reference to the value of the distance a between the first groove 122 and the binding area NA01, which will not be described herein.
The function of the second groove 124 in this embodiment is different from that of the first groove 122 in the transition area NA02 in embodiment 1, the first groove 122 is used for blocking the peeling of the film layer at the cutting boundary, and is also used for improving the flexibility of the transition area NA02 after removing the metal film layer, so that the bending is facilitated, the metal film layer is not removed at the position of the second groove 124 in this embodiment to realize metal connection, and the etching of part of the film layer at the position of the second groove 124 is used for improving the flexibility, so that the functions of the first groove 122 and the second groove 124 in this embodiment are different.
In an alternative embodiment, the second groove 124 extends along the second direction and penetrates through the opposite boundary of the display module extending along the first direction, that is, the first groove 122 may be different from the structural design of the second groove 124, the length of the first groove 122 is based on the overall length covering the area where the connection terminal 121 is located, and it is not limited whether the first groove 122 penetrates through the display module, but the second groove 124 is based on the penetrating through display module as a design criterion, so as to achieve different design requirements.
In an alternative embodiment, the display panel is folded to the surface of the substrate 11 facing away from the driving substrate 12 with the second boundary of the second recess 124 near the display area AA shown in fig. 8 as a bending area.
That is, the bending region in embodiment 3 is different from the bending regions in embodiment 1 and embodiment 2, and after bending, the metal wiring connected to the driving substrate 12 and the connection terminal 121 is similarly bent, and the bending region in embodiment 3 is closer to the display area AA, so that the frame size can be further reduced, and a narrow frame design can be realized.
Another embodiment of the present invention provides a method for manufacturing the display panel according to the foregoing embodiment of the present invention, including:
s1, forming a substrate 11 in array arrangement on a glass substrate, wherein the substrate 11 is a flexible substrate, and a plurality of flexible substrates are formed on the glass substrate at one time;
s3, forming a driving substrate 12 on the substrate 11, where the driving substrate 12 includes a display area AA and a non-display area NA surrounding the display area AA, and the non-display area NA includes: a binding area NA01 provided with a connecting terminal 121, and a transition area NA02 positioned on one side of the binding area NA01 far away from the display area AA, wherein the film layer of the transition area NA02 is not provided with a metal film layer. Illustratively, the top view structure of the transition area NA02 of the driving substrate 12 formed in this step is as shown in fig. 2, 3, and 5-8;
s5, cutting the plurality of driving substrates 12.
Further, based on the above process, the method further includes performing a bonding process of the driving circuit board 14 and the driving chip 18 on each of the driving substrates 12 after dicing, respectively.
In the related art, there are two cutting schemes for cutting the driving substrate 12, and, by way of example,
cutting scheme 1: when dicing the drive substrate 12, laser dicing is used to avoid film-to-film separation caused by mechanical dicing of the laterally extruded film layers. However, because the glass substrate, the flexible substrate and the multilayer film of the driving substrate 12 form a rigid-flexible composite structure, special laser cutting devices are required to be used respectively, and the rigid film layer and the flexible film layer are cut twice by using the cutting devices of two different laser sources, or the rigid film layer and the flexible film layer are cut up and down simultaneously by using the cutting devices of two different laser sources, the investment of the cutting scheme is large.
Cutting scheme 2: after the first cutting of the driving substrate 12, after the crimping of the driving circuit board 14 and the binding process of the driving chip 18 are completed, the transition area NA02 is cut off from the non-light-emitting side surface by using the newly added laser device. According to the scheme, one laser cutting operation is additionally added, and the manufacturing cost is increased. The manufacturing method of the embodiment of the invention can be completed by only one cutting process without newly added laser equipment and performing one cutting by using the conventional cutting process, and in the cutting process, the phenomenon of blocking film separation by using the transition area NA02 is expanded to the binding area NA01, so that the cutting process is conventional and efficient, such as cutting by a cutter wheel, and the cost is lower and the process efficiency is high.
It should be noted that, the specific embodiments of the method for manufacturing a display panel according to the embodiment of the present invention can refer to the display panel of the foregoing embodiment, and are not described herein again. Another embodiment of the present invention provides a display device, which includes the display panel according to the foregoing embodiment of the present invention. The display device comprising the display module of any one of the preceding embodiments. The display device may be any product or component with a display function, such as electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, etc., which is not limited in this embodiment.
In the description of the present invention, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
It should be understood that the foregoing examples of the present invention are provided merely for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (15)
1. A display panel, characterized in that the display panel comprises a substrate and a driving substrate arranged on the substrate, the driving substrate comprises a display area and a non-display area surrounding at least part of the display area,
the non-display area includes:
the binding area is provided with a connecting terminal; and
and the film layer of the transition area is not provided with a metal film layer.
2. The display panel of claim 1, wherein the display panel comprises,
the direction from the display area to the transition area is a first direction, a second direction is perpendicular to the first direction,
in the second direction, the number of film layers of the transition region of at least a portion of the region is less than the number of film layers of the binding region.
3. The display panel of claim 2, wherein the display panel comprises,
the film layer of the binding region comprises an organic layer, an inorganic layer and a metal layer for forming the connecting terminal;
the film layer of the transition zone comprises one or more layers of organic layers or inorganic layers, and the substrate is one of the organic layers.
4. The display panel according to claim 3, wherein,
the connection terminals of the binding area are sequentially arranged along the second direction,
a first distance is reserved between a terminal boundary of the binding area, which is far away from the display area, and a first boundary of the transition area, which is close to the display area;
the display panel takes the area, away from the display area, of the first boundary as a bending area, and is folded to the surface, away from the driving substrate, of the substrate.
5. The display panel of claim 4, wherein the display panel comprises,
at least part of the transition region comprises at least one first groove extending along a second direction, and the film layer at the corresponding position of the first groove comprises one or more layers of an organic layer or an inorganic layer;
in the second direction, the first groove extends to a length that covers at least the furthest distance between the two connection terminals that are furthest from each other.
6. The display panel of claim 5, wherein the first groove has a width in the first direction of 5 μm to 10 μm:
the distance between the boundary of the groove body on one side of the first groove close to the display area and the boundary of the transition area on one side of the transition area far away from the display area is the width of the transition area, and the width of the transition area is 0.5-5 mm.
7. The display panel of claim 4, wherein the film layer of the entire area of the transition region includes one or more of an organic layer or an inorganic layer;
the distance between the first boundary of the transition area, which is close to one side of the display area, and the boundary of the transition area, which is far away from one side of the display area, is the width of the transition area, and the width of the transition area is larger than the aperture of the switching hole of the binding area.
8. The display panel according to claim 7, wherein an aperture of the photoresist for forming the transfer hole located in the bonding region is not smaller than an aperture of the photoresist for forming the transfer hole located in the display region.
9. A display panel according to claim 3, wherein the bonding area further comprises a second groove, the second groove is located between a boundary of a side of the bonding area, where the connection terminal is close to the display area, and a boundary of a side of the display area, where the display area is close to the bonding area, and the film layer at a corresponding position of the second groove comprises a metal film layer to connect the driving substrate and the connection terminal of the bonding area, and the second groove extends along the second direction and penetrates through an opposite boundary of the display module, where the connection terminal extends along the first direction.
10. The display panel according to claim 9, wherein the display panel is folded to a surface of the substrate facing away from the driving substrate with a second boundary of the second groove on a side close to the display area as a bending region.
11. The display panel according to claim 1, further comprising an electronic paper layer provided on the driving substrate, and a driving circuit board connected to the driving substrate, the connection terminal being for connecting the driving circuit board.
12. The display panel of claim 11, further comprising a driver chip, wherein the connection terminals are further configured to connect to the driver chip, and wherein the driver chip is located on a side of the driver circuit board in the bonding area, which is adjacent to the display area.
13. The display panel according to claim 11 or 12, further comprising a protective layer on a surface of the film layer at the transition region and/or the binding region on a side away from the substrate, the front projection of the protective layer on the substrate not overlapping with the front projection of the driving circuit board or the driving chip on the substrate.
14. A method of making the display panel of any one of claims 1-13, the method comprising:
forming a substrate arranged in an array on a glass substrate;
forming driving substrates on the substrates, respectively;
cutting a plurality of driving substrates, wherein the driving substrates comprise a display area and a non-display area surrounding the display area, and the non-display area comprises: the display device comprises a binding area provided with a connecting terminal and a transition area positioned at one side of the binding area far away from the display area, wherein a metal film layer is not arranged on the film layer of the transition area.
15. A display device, characterized in that the display device comprises the display panel of any one of claims 1-13.
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| CN202410008910.8A CN117826501A (en) | 2024-01-02 | 2024-01-02 | Display panel, manufacturing method and display device |
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| CN202410008910.8A CN117826501A (en) | 2024-01-02 | 2024-01-02 | Display panel, manufacturing method and display device |
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