CN114545688B - Display panel and alignment film preparation method - Google Patents
Display panel and alignment film preparation method Download PDFInfo
- Publication number
- CN114545688B CN114545688B CN202210455216.1A CN202210455216A CN114545688B CN 114545688 B CN114545688 B CN 114545688B CN 202210455216 A CN202210455216 A CN 202210455216A CN 114545688 B CN114545688 B CN 114545688B
- Authority
- CN
- China
- Prior art keywords
- alignment
- alignment film
- display
- film
- display area
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 238000001179 sorption measurement Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000000758 substrate Substances 0.000 claims description 136
- 239000007788 liquid Substances 0.000 claims description 93
- 239000000463 material Substances 0.000 claims description 53
- 239000004973 liquid crystal related substance Substances 0.000 abstract description 33
- 150000002500 ions Chemical class 0.000 abstract description 31
- 239000012535 impurity Substances 0.000 abstract description 13
- 239000000853 adhesive Substances 0.000 abstract description 2
- 230000001070 adhesive effect Effects 0.000 abstract description 2
- 239000010408 film Substances 0.000 description 257
- 239000004642 Polyimide Substances 0.000 description 24
- 229920001721 polyimide Polymers 0.000 description 24
- 229920005575 poly(amic acid) Polymers 0.000 description 20
- 239000010410 layer Substances 0.000 description 14
- 238000007639 printing Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 6
- 206010047571 Visual impairment Diseases 0.000 description 5
- 239000002344 surface layer Substances 0.000 description 4
- 239000003292 glue Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- G02F1/13—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 liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/13378—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
Abstract
The application provides a display panel and an alignment film preparation method, the display panel comprises a first alignment film and a second alignment film, the display panel is provided with a display area and a non-display area, the first alignment film completely covers the display area and extends at least partially to the non-display area, the second alignment film covers at least part of the non-display area and surrounds the first alignment film, the ion adsorption capacity of the second alignment film is larger than that of the first alignment film, and the adhesion force of the second alignment film is larger than that of the first alignment film. Because the ion adsorption capacity and the adhesive force of the second alignment film are both larger than those of the first alignment film, and the second alignment film is arranged in the non-display area, when direct-current bias voltage occurs in the driving process of the display panel, charged impurity ions in the liquid crystal layer can be selectively adsorbed to the surface of the second alignment film, so that pixels on the display area are prevented from being influenced, and the problem of residual image of the display panel is solved. The second alignment film is well adhered to the rest of the components in the non-display region, thereby ensuring the airtightness of the display panel.
Description
Technical Field
The application relates to the technical field of display, in particular to a display panel and an alignment film preparation method.
Background
Display technology is one of the important research directions in electronic devices, in which a Thin Film Transistor Liquid Crystal Display (TFT-LCD) is formed by combining a Liquid Crystal Display panel, a circuit board and a backlight assembly, and the Liquid Crystal Display panel is formed by combining an Array (Array) backplane, a Color Filter (CF) backplane, Liquid crystals in the two backplates, and a sealant. Therefore, the technology of the liquid crystal display panel comprises an Array technology, a CF technology and a box forming (Cell) technology, wherein the box forming technology is to print alignment films on an Array substrate and a color film substrate, after the alignment films are solidified, coat frame sealing glue and drop liquid crystal on the Array substrate or the color film substrate, pair the Array substrate and the color film substrate to form a box under the vacuum condition, and enable the liquid crystal to be regularly arranged and solidify the frame sealing glue through ultraviolet light and heating.
The alignment film is used for forming a pretilt angle with a certain angle, anchoring surface layer liquid crystal in contact with the alignment film and enabling the surface layer liquid crystal to be regularly arranged according to the pretilt angle. The alignment film is directly contacted with the liquid crystal layer due to the action of the alignment film, the liquid crystal layer contains certain impurity ions due to the reasons of materials, manufacturing processes and the like, and the charged impurity ions in the liquid crystal layer can be selectively adsorbed to the surface of the alignment film when direct-current bias voltage occurs in the driving process of the display panel due to the fact that the alignment film material is polyimide high-molecular organic matter. When the Image IS switched, the charged ions on the surface of the alignment film form an additional electric field, which causes the brightness difference of the pixels on the display panel and displays the same Image for a long time, and this phenomenon IS particularly obvious when the Image IS switched to display, and IS referred to as Image Sticking (IS).
It can be understood that the degree of the afterimage of the panel is greatly affected by the strength of the ion adsorption capability of the alignment film, and when the ion adsorption capability of the alignment film is strong, the afterimage phenomenon of the display panel is obviously deteriorated. For the material of the alignment film, the more polar the alignment film, the stronger its ability to adsorb ions. In general, the weaker the polarity of most alignment film materials is, the weaker the bonding force is, so that a gap may exist at the bonding portion of the alignment film and the frame sealing glue, thereby affecting the air tightness of the display panel and being easily corroded by moisture. Therefore, in the prior art, the afterimage problem and the airtightness of the display panel cannot be simultaneously ensured.
Disclosure of Invention
The application discloses display panel can guarantee display panel's gas tightness when solving display panel afterimage problem.
In a first aspect, the present application provides a display panel, the display panel includes a first alignment film and a second alignment film, the display panel has a display area and a non-display area, the first alignment film completely covers the display area and extends at least a portion of the non-display area, the second alignment film covers at least a portion of the non-display area and surrounds the first alignment film, wherein an ion adsorption capacity of the second alignment film is greater than the first alignment film, and a bonding force of the second alignment film is greater than the first alignment film.
Optionally, the first alignment film is made of a PAA material and a PI material, and the second alignment film is made of a PAA material.
Optionally, the distance that the first alignment film extends to the non-display area ranges from 0.2mm to 1 mm.
Optionally, the second alignment film covers at least 50% of the non-display region.
Optionally, the display panel further includes an array substrate and a color film substrate which are stacked, the first alignment film is disposed on a portion of the array substrate corresponding to the display area and extends at least partially to a portion of the array substrate corresponding to the non-display area, the second alignment film is disposed on a portion of the array substrate corresponding to the non-display area, and the first alignment film is further disposed on a portion of the color film substrate corresponding to the display area and the non-display area; or,
the first alignment film is arranged on the portion, corresponding to the display area, of the color film substrate and extends at least partially to the portion, corresponding to the non-display area, of the color film substrate, the second alignment film is arranged on the portion, corresponding to the non-display area, of the color film substrate, and the first alignment film is further arranged on the portion, corresponding to the display area and the non-display area, of the array substrate.
Optionally, the display panel further includes an array substrate and a color film substrate which are stacked, the first alignment film is disposed on portions of the array substrate and the color film substrate corresponding to the display area and extends at least partially to portions of the array substrate and the color film substrate corresponding to the non-display area, and the second alignment film is disposed on portions of the array substrate and the color film substrate corresponding to the non-display area.
In a second aspect, the present application further provides a method for preparing an alignment film, which is applied to a display panel, where the display panel has a display region and a non-display region, the non-display region is surrounded by the display region, and the method for preparing the alignment film includes:
presetting a first alignment area on the display panel, wherein the first alignment area completely covers the display area and extends at least partially to the non-display area;
presetting a second alignment area on the display panel, wherein the second alignment area covers at least part of the non-display area and is arranged around the first alignment area;
providing a first alignment liquid and a second alignment liquid, disposing the first alignment liquid in the first alignment region to form a first alignment film, and disposing the second alignment liquid in the second alignment region to form a second alignment film, wherein the ion adsorption capacity of the second alignment film is greater than that of the first alignment film, and the adhesion force of the second alignment film is greater than that of the first alignment film.
Optionally, "providing a first alignment liquid and a second alignment liquid" specifically includes:
providing a PAA material and a PI material;
mixing the PAA material and the PI material in proportion to prepare the first alignment liquid;
and preparing the PAA material into the second alignment liquid.
Optionally, the display panel includes an array substrate and a color film substrate that are stacked, and the alignment film preparation method further includes:
presetting that the first alignment area covers the part of the array substrate corresponding to the display area, and presetting that the second alignment area covers the part of the array substrate corresponding to the non-display area;
presetting a third alignment area on the color film substrate, wherein the third alignment area completely covers the parts of the color film substrate corresponding to the display area and the non-display area;
arranging the first alignment liquid in the third alignment area; or,
presetting a part of the color film substrate corresponding to the display area, which is covered by the first alignment area, and presetting a part of the color film substrate corresponding to the non-display area, which is covered by the second alignment area;
presetting a third alignment area on the array substrate, wherein the third alignment area completely covers the parts of the array substrate corresponding to the display area and the non-display area;
and arranging the first alignment liquid in the third alignment area.
Optionally, the display panel includes an array substrate and a color film substrate that are stacked, and the alignment film preparation method further includes:
presetting the first alignment region to cover the array substrate and the color film substrate corresponding to the display region, and presetting the second alignment region to cover the array substrate and the color film substrate corresponding to the non-display region.
Because the ion adsorption capacity and the adhesion of second alignment film all are greater than first alignment film, just the second alignment film set up in the non-display area, when display panel appears direct current bias voltage in the drive process, charged impurity ion has the selective absorption in the liquid crystal layer to the surface of second alignment film avoids influencing pixel on the display area to improve display panel's afterimage problem. Meanwhile, the second alignment film is well adhered to the rest of the components in the non-display area, so that the airtightness of the display panel is ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for a person skilled in the art to obtain other drawings based on the drawings without any inventive exercise.
Fig. 1 is a schematic top view of a display panel according to an embodiment of the present disclosure.
Fig. 2 is a schematic sectional view taken along line I-I in fig. 1.
Fig. 3 is a schematic cross-sectional view of a display panel according to an embodiment of the present application.
Fig. 4 is a schematic cross-sectional view of a display panel according to another embodiment of the present application.
Fig. 5 is a schematic cross-sectional view of a display device according to an embodiment of the present application.
Fig. 6 is an enlarged partial cross-sectional view of a display panel according to an embodiment of the present application.
Fig. 7 is a schematic flow chart illustrating a method for preparing an alignment film according to an embodiment of the present disclosure.
The reference numbers illustrate: the display device comprises a display panel-1, a display area-1 a, a non-display area-1 b, a first alignment film-11, a second alignment film-12, an array substrate-13, a color film substrate-14, a liquid crystal layer-15, a display device-2, a back plate-21 and a frame body-22.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.
Please refer to fig. 1, wherein fig. 1 is a schematic top view of a display panel 1 according to an embodiment of the present disclosure. The display panel 1 includes a first alignment film 11 and a second alignment film 12, the display panel 1 has a display area 1a and a non-display area 1b, the first alignment film 11 completely covers the display area 1a and extends at least partially to the non-display area 1b, the second alignment film 12 covers at least partially the non-display area 1b and surrounds the first alignment film 11, wherein the ion adsorption capacity of the second alignment film 12 is greater than that of the first alignment film 11, and the adhesion force of the second alignment film 12 is greater than that of the first alignment film 11.
In this embodiment, the display panel 1 is a TFT-LCD display, and the display panel 1 is provided with a liquid crystal for adjusting light emitted from the backlight assembly to display a picture. The first alignment film 11 and the second alignment film 12 function to form a pretilt angle with a certain angle, so as to anchor the surface layer liquid crystal in contact with the first alignment film 11 or the second alignment film 12, and to enable the liquid crystal to be regularly arranged according to the pretilt angle.
In this embodiment, the first alignment film 11 and the second alignment film 12 are formed by disposing a first alignment liquid and a second alignment liquid on the display panel, respectively, and the properties of the first alignment film 11 formed by the first alignment liquid and the properties of the second alignment film 12 formed by the second alignment liquid may be different by the preparation materials of the first alignment liquid and the second alignment liquid. In this embodiment, the properties of the first alignment film 11 are different from those of the second alignment film 12, in that the ion adsorption capacity of the second alignment film 12 is greater than that of the first alignment film 11, and the adhesion force of the second alignment film 12 is greater than that of the first alignment film 11.
It can be understood that the ion adsorption capacity of the second alignment film 12 is greater than that of the first alignment film 11, the first alignment film 11 is disposed in the display region 1a, and the second alignment film 12 is disposed in the non-display region 1b, when a dc bias voltage occurs during the driving process of the display panel 1, charged impurity ions in the liquid crystal are preferentially adsorbed to the second alignment film 12, thereby avoiding affecting the normal operation of the pixel unit in the display region 1 a.
Further, in this embodiment, the first alignment film 11 extends at least partially toward the non-display region 1b, so that the second alignment film 12 is formed on the periphery of the non-display region 1b to a greater extent, that is, when a dc bias voltage occurs during the driving of the display panel 1, charged impurity ions in the liquid crystal are adsorbed to the periphery of the non-display region 1b, thereby avoiding affecting the normal operation of the pixel unit of the portion where the display region 1a is connected to the non-display region 1 b.
Specifically, the adhesion force of the second alignment film 12 is greater than the adhesion force of the first alignment film 11, which means that when the surface of the second alignment film 12 contacts with other structures, the adhesion or adsorption degree of the second alignment film 12 to the other structures is greater than that of the first alignment film 11, and the second alignment film 12 is disposed in the non-display area 1b, so that the airtightness of the non-display area 1b of the display panel 1 is improved, and thus, external water, gas and other substances are prevented from entering the display panel 1 and corroding.
It can be understood that, in the embodiment, since the ion adsorption capacity and the adhesion force of the second alignment film 12 are both greater than those of the first alignment film 11, and the second alignment film 12 is disposed in the non-display region 1b, when a dc bias voltage occurs during the driving process of the display panel 1, charged impurity ions in the liquid crystal are selectively adsorbed onto the surface of the second alignment film 12, so as to avoid affecting the pixels on the display region 1a, thereby improving the image sticking problem of the display panel 1. Meanwhile, the second alignment film 12 is well attached to the rest of the components located in the non-display region 1b, ensuring the airtightness of the display panel 1.
It should be noted that, in the embodiment of the present application, the display panel 1 may be capable of bearing electronic devices such as a television, a mobile phone, a smart phone, a tablet computer, an electronic reader, a portable device when worn, and a notebook computer, and may communicate with a data transfer server through the internet, where the data transfer server may be an instant messaging server, an SNS (Social Networking Services) server, and the like, and the embodiment of the present application is not limited thereto.
In one possible embodiment, the first alignment film 11 is made of a PAA material and a PI material, and the second alignment film 12 is made of a PAA material.
The alignment film materials used for the display panel 1 mainly include two types, which are polyamic acid (PAA) and Polyimide (PI). Among them, an alignment film made of a PAA-based material has a better adhesion force, but has a stronger ion adsorption capability, and a poor Voltage Holding Ratio (VHR). The alignment film made of the PI materials has weak ion adsorption capacity, excellent VHR (very high frequency) and excellent heat resistance and Ultraviolet (UV) resistance stability, but has poor adhesion.
In this embodiment, the first alignment liquid is made of a mixture of a PAA material and a PI material, so that the first alignment film 11 formed by the first alignment liquid has characteristics of superior VHR, superior heat resistance, and superior UV stability. It can be understood that, the second alignment liquid is made of a PAA material, and since the PI material is mixed in the first alignment liquid, the second alignment film 12 formed by the second alignment liquid has a larger particle adsorbing capability and a larger adhesive force than the first alignment film 11, so that when a dc bias voltage occurs during driving of the display panel 1, charged impurity ions in the liquid crystal can be selectively adsorbed to the surface of the second alignment film 12, and meanwhile, the airtightness of the display panel 1 is improved.
In a possible embodiment, the proportion of the PI material in the first alignment liquid is in a range of 20% to 100%; further, the proportion range of the PI material in the first alignment liquid can also be 40% -80%.
It is understood that the larger the specific gravity of the PI material doped in the first alignment liquid, the weaker the ability of the first alignment film 11 to adsorb particles relative to the second alignment film 12 is, but the specific gravity of the PI material doped in the first alignment liquid should not be too large in order to maintain a certain adhesion force of the first alignment film 11. In this embodiment, the ratio of the PAA material to the PI material in the first alignment solution is 5:5, that is, the ratio of the PI material in the first alignment solution is 50%.
It is understood that, in other possible embodiments, the ratio of the PAA material to the PI material in the first alignment solution may also be other, and the application is not limited thereto.
In one possible embodiment, the first alignment film 11 extends toward the non-display region 1b by a distance ranging from 0.2mm to 1 mm.
In this embodiment, the first alignment film 11 may extend from the portion located in the display region 1a to any direction of the non-display region 1b, and optionally, the first alignment film 11 extends from the portion located in the display region 1a along the upper, lower, left, and right sides perpendicular to the stacking direction of the display panel 1, and the extending distance ranges from 0.2mm to 1 mm. It is understood that the distances that the first alignment films 11 extend along the upper, lower, left, and right sides perpendicular to the stacking direction of the display panel 1 may be the same or different. It is understood that, in contrast, the distance between the second alignment film 12 and the inner boundary of the non-display region 1b is also in the range of 0.2mm to 1 mm.
Specifically, the distance range of the first alignment film 11 extending to the non-display region 1b is 0.2mm to 1 mm; optionally, the distance range of the first alignment film 11 extending to the non-display region 1b may also be 0.4mm to 0.8 mm; further, the first alignment film 11 extends 0.5mm toward the non-display region 1 b.
It can be understood that, when the distance that the first alignment film 11 extends to the non-display area 1b is longer, the portion of the second alignment film 12 covering the non-display area 1b may be smaller, and the adhesion area between the second alignment film 12 and the rest of the display panel 1 in the non-display area 1b becomes smaller, resulting in poor adhesion and affecting the air tightness of the display panel 1; when the first alignment film 11 extends to the non-display region 1b for a short distance, the second alignment film 12 is disposed adjacent to the display region 1a, so that when the impurity ions in the liquid crystal are adsorbed on the second alignment film 12, the normal operation of the pixel unit in the portion of the display region 1a adjacent to the non-display region 1b may still be affected. Therefore, the distance that the first alignment film 11 extends to the non-display region 1b is not too large or too small, and in the present embodiment, the distance that the first alignment film 11 extends to the non-display region 1b is in the range of 0.2mm to 1 mm.
In one possible embodiment, the second alignment film 12 covers at least 50% of the non-display region 1 b.
It is understood that, since the first alignment film 11 extends at least partially toward the non-display region 1b, thereby reducing the occupied space of the second alignment film 12, the second alignment film 12 covers at least 50% of the non-display region 1b in order to ensure good adhesion of the second alignment film 12 to the rest of the components located in the non-display region 1 b. It can be understood that as the space of the second alignment film 12 covering the non-display region 1b is larger, the area of the second alignment film 12 contacting the rest of the non-display region 1b is also larger, so that the second alignment film 12 can better contact the rest of the display panel 1 in the non-display region 1b to ensure the airtightness of the display panel 1.
It is understood that, in other possible embodiments, the second alignment film 12 may also cover at least 60%, 70%, 80%, etc. of the non-display region 1b, which is not limited in this application.
In one possible embodiment, please refer to fig. 2 and fig. 3 together, fig. 2 is a schematic cross-sectional view taken along line I-I in fig. 1; fig. 3 is a schematic cross-sectional view of a display panel according to an embodiment of the present application. The display panel 1 further includes an array substrate 13 and a color film substrate 14 which are stacked, the first alignment film 11 is disposed on a portion of the array substrate 13 corresponding to the display area 1a and extends at least partially to a portion of the array substrate 13 corresponding to the non-display area 1b, the second alignment film 12 is disposed on a portion of the array substrate 13 corresponding to the non-display area 1b, and the first alignment film 11 is further disposed on a portion of the color film substrate 14 corresponding to the display area 1a and the non-display area 1 b; or,
the first alignment film 11 is disposed on a portion of the color film substrate 14 corresponding to the display area 1a and extends at least partially to a portion of the color film substrate 14 corresponding to the non-display area 1b, the second alignment film 12 is disposed on a portion of the color film substrate 14 corresponding to the non-display area 1b, and the first alignment film 11 is further disposed on a portion of the array substrate 13 corresponding to the display area 1a and the non-display area 1 b.
It should be noted that, as shown in fig. 2 and fig. 3, the display panel 1 further includes a liquid crystal layer 15, in a normal case, the liquid crystal layer 15 is disposed between the array substrate 13 and the color filter substrate 14, and the first alignment film 11 and the second alignment film 12 are disposed on one side of the array substrate 13 adjacent to the color filter substrate 14, or the color filter substrate 14 is adjacent to one side of the array substrate 13, so that the first alignment film 11 and the second alignment film 12 are connected to the surface of the liquid crystal layer 15 to anchor surface layer liquid crystals of the liquid crystal layer 15 and make them regularly arranged according to a pretilt angle.
Specifically, as shown in fig. 2, the first alignment film 11 is further disposed on a portion of the color filter substrate 14 corresponding to the display area 1a, so that the first alignment film 11 disposed on the portion of the color filter substrate 14 corresponding to the display area 1a is integrated with the first alignment film 11 disposed on the portion of the color filter substrate 14 corresponding to the non-display area 1 b; alternatively, as shown in fig. 3, the first alignment film 11 is further disposed on the portion of the array substrate 13 corresponding to the display area 1a, so that the first alignment film 11 disposed on the portion of the array substrate 13 corresponding to the display area 1a is integrated with the first alignment film 11 disposed on the portion of the array substrate 13 corresponding to the non-display area 1 b.
In this embodiment, the second alignment film 12 is only disposed on the array substrate 13 in the non-display region 1b, or the second alignment film 12 is only disposed on the color filter substrate 14 in the non-display region 1b, and the rest of the second alignment film is disposed corresponding to the first alignment film 11. It can be understood that, the number of the second alignment films 12 in the non-display region 1b is at least one, that is, when a dc bias voltage occurs during the driving process of the display panel 1, the impurity ions in the liquid crystal layer 15 are selectively adsorbed to the second alignment films 12, so as to avoid affecting the normal operation of the pixels in the display region 1 a.
In one possible implementation, please refer to fig. 4, and fig. 4 is a schematic cross-sectional view of a display panel according to another implementation of the present disclosure. The display panel 1 further includes an array substrate 13 and a color film substrate 14 which are stacked, the first alignment film 11 is disposed on portions of the array substrate 13 and the color film substrate 14 corresponding to the display area 1a and extends at least partially to portions of the array substrate 13 and the color film substrate 14 corresponding to the non-display area 1b, and the second alignment film 12 is disposed on portions of the array substrate 13 and the color film substrate 14 corresponding to the non-display area 1 b.
Specifically, the difference between the present embodiment and the previous embodiment is that the first alignment film 11 is disposed on the array substrate 13 and the color filter substrate 14 at the portion of the display area 1 a. It can be understood that, in the present embodiment, when the display panel 1 generates a dc bias voltage during driving, most of the impurity ions in the liquid crystal layer 15 are adsorbed to the second alignment film 12 in the non-display region 1b, so as to improve the image retention problem of the display panel 1 to the greatest extent.
It can be understood that, in this embodiment, the second alignment film 12 may be further disposed on a portion of the array substrate 13 or the color filter substrate 14 located in the display area 1a, so as to further improve the adhesion between the liquid crystal layer 15 and the array substrate 13 or the color filter substrate 14, and improve the air tightness of the display panel 1. In other possible embodiments, the present application does not limit the arrangement of the first alignment film 11 and the second alignment film 12 as long as it is ensured that the number of the second alignment films 12 located in the non-display region 1b is at least one.
In a possible embodiment, the present application further provides a display device 2, please refer to fig. 5 together, and fig. 5 is a schematic cross-sectional view of the display device provided in an embodiment of the present application. The display device 2 includes a back plate 21, a frame 22 and the display panel 1 as described above, the back plate 21 is used for carrying the display panel 1, the frame 22 surrounds the display panel 1, and the frame 22 is bonded to the second alignment film 12.
It can be understood that, in the embodiment, since the ion adsorption capacity and the adhesion force of the second alignment film 12 are both greater than those of the first alignment film 11, and the second alignment film 12 is disposed in the non-display region 1b, when the display panel 1 generates the dc bias voltage during the driving process, the charged impurity ions in the liquid crystal layer 15 can be selectively adsorbed onto the surface of the second alignment film 12, so as to avoid affecting the pixels on the display region 1a, thereby improving the image sticking problem of the display panel 1. Meanwhile, the second alignment film 12 is well adhered to the frame 22, so that the airtightness of the display panel 1 is ensured.
In a possible implementation manner, please refer to fig. 6 together, and fig. 6 is a partially enlarged cross-sectional schematic view of a display panel according to an embodiment of the present disclosure. The first alignment film 11 and the second alignment film 12 are at least partially stacked, and the range of the stacked portion is 0% -100%; optionally, the range of the laminated part may also be 0% to 60%, which is not limited in this application.
Specifically, as shown in fig. 6, the first alignment film 11 and the second alignment film 12 are at least partially stacked, and the cross-sectional shape of the second alignment film 12 is L-shaped. It is understood that, in the present embodiment, the first alignment film 11 and the second alignment film 12 are at least partially stacked, such that an adhesion area is provided between the first alignment film 11 and the second alignment film 12, and thus the adhesion between the first alignment film 11 and the second alignment film 12 is also good, and the air tightness of the display panel 1 is further improved.
It is understood that, in other possible embodiments, the cross-sectional shape of the second alignment film 12 may also be a Γ type, or the first alignment film 11 may also be embedded in the second alignment film 12, which is not limited in this application.
The application also provides a preparation method of an alignment film, which is applied to a display panel 1, wherein the display panel 1 has a display area 1a and a non-display area 1b, the non-display area 1b is surrounded on the display area 1a, please refer to fig. 7 together, and fig. 7 is a schematic flow diagram of the preparation method of the alignment film according to an embodiment of the application. The preparation method of the alignment film comprises the steps of S701, S702 and S703. The steps S701, S702, and S703 are described in detail as follows.
S701, presetting a first alignment area on the display panel, wherein the first alignment area completely covers the display area and extends at least partially to the non-display area;
s702, presetting a second alignment area on the display panel, wherein the second alignment area covers at least part of the non-display area and is surrounded on the first alignment area;
s703 providing a first alignment liquid and a second alignment liquid, disposing the first alignment liquid in the first alignment region to form a first alignment film, and disposing the second alignment liquid in the second alignment region to form a second alignment film, wherein an ion adsorption capacity of the second alignment film is greater than that of the first alignment film, and an adhesion force of the second alignment film is greater than that of the first alignment film.
Specifically, please refer to the above description for the display panel 1, the first alignment film 11, and the second alignment film 12, which is not repeated herein.
It can be understood that, in the embodiment, since the ion adsorption capacity and the adhesion force of the second alignment film 12 formed by the second alignment liquid are both greater than those of the first alignment film 11 formed by the first alignment liquid, and the second alignment film 12 is disposed in the non-display region 1b, when a dc bias voltage occurs during the driving process of the display panel 1, the charged impurity ions in the liquid crystal can be selectively adsorbed onto the surface of the second alignment film 12, so as to avoid affecting the pixels on the display region 1a, thereby improving the image sticking problem of the display panel 1. Meanwhile, the second alignment film 12 is well attached to the rest of the components located in the non-display region 1b, ensuring the airtightness of the display panel 1.
In one possible embodiment, the step of disposing the first alignment liquid in the first alignment region to form a first alignment film and the step of disposing the second alignment liquid in the second alignment region to form a second alignment film includes:
pre-baking the first alignment liquid arranged in the first alignment area and the second alignment liquid arranged in the second alignment area;
and re-baking the pre-baked first alignment liquid and the pre-baked second alignment liquid to form the first alignment film and the second alignment film respectively.
Specifically, after the first alignment liquid is disposed in the first alignment region and the second alignment liquid is disposed in the second alignment region, the first alignment liquid and the second alignment liquid need to be baked to evaporate moisture therein to realize curing, so as to form the first alignment film 11 and the second alignment film 12.
In this embodiment, the pre-baking temperature should be lower than the re-baking temperature, and it can be understood that the first alignment liquid and the second alignment liquid are pre-baked first and then the pre-baked first alignment liquid and the pre-baked second alignment liquid are re-baked, so as to achieve the purpose of "preheating" the first alignment liquid and the second alignment liquid, thereby avoiding directly baking the first alignment liquid and the second alignment liquid at a high temperature, so that the cured first alignment film 11 and the cured second alignment film 12 are not prone to have defects such as "cracks".
It is understood that, in other possible embodiments, the first alignment liquid and the second alignment liquid may be baked at more stages of temperatures, which is not limited in this application.
In one possible embodiment, the pre-bake conditions include:
the baking temperature is 100-150 ℃, and the baking time is 80-200 seconds;
the rebaking conditions include:
the baking temperature is 200-250 ℃, and the baking time is 1200-3000 seconds.
Specifically, the baking temperature of the pre-baking is about 1/2 of the baking temperature of the re-baking, and the baking time of the pre-baking is far shorter than the baking time of the re-baking. It is understood that, in the present embodiment, the pre-baking temperature is 110 degrees celsius, and the baking time is 120 seconds; the re-baking temperature is 230 ℃, and the baking time is 1800 seconds. The pre-baking is performed to enable the temperature of the first alignment liquid and the temperature of the second alignment liquid to be gradually increased to 110 ℃, and then the temperature of the first alignment liquid and the temperature of the second alignment liquid are gradually increased to 230 ℃ from 110 ℃ during the re-baking, so that the temperature of the first alignment liquid and the temperature of the second alignment liquid are prevented from being rapidly increased, defects such as 'cracks' are not prone to occurring on the first alignment film 11 and the second alignment film 12 which are formed through curing, the re-baking time is long, and moisture in the first alignment liquid and the second alignment liquid can be effectively evaporated and removed.
It is understood that, in other possible embodiments, the pre-baking condition and the re-baking condition may be other conditions, and the present application is not limited thereto.
In a possible embodiment, the "disposing the first alignment liquid in the first alignment region" specifically includes:
arranging the first alignment liquid in the first alignment area in a single-drop printing mode; wherein the single-drop printing amount of the first alignment liquid is 30ng-150 ng;
the "disposing the second alignment liquid in the second alignment region" specifically includes:
arranging the second alignment liquid in the second alignment area in a single-drop printing mode; wherein the single-drop printing quantity of the second alignment liquid is 30ng-150 ng.
Specifically, the single-drop printing manner is to dispose each drop of the first alignment liquid and the second alignment liquid in an amount of 30ng to 150ng in each of the first alignment region, the second alignment region, or the third alignment region to form the first alignment film 11 and the second alignment film 12, respectively. In order to ensure flatness of the first alignment film 11 and the second alignment film 12 in the direction perpendicular to the lamination direction and prevent the first alignment liquid and the second alignment liquid from overflowing to other regions, it is necessary to limit the single-drop printing amount of the first alignment liquid and the second alignment liquid. Optionally, the printing amount of a single drop of the first alignment liquid and the second alignment liquid may also be 50ng to 130 ng. It is understood that, in the present embodiment, the single drop printing amount of the first alignment liquid and the second alignment liquid is 90 ng.
In a possible embodiment, the providing the first alignment liquid and the second alignment liquid includes:
providing a PAA material and a PI material;
mixing the PAA material and the PI material in proportion to prepare the first alignment liquid;
and preparing the PAA material into the second alignment liquid.
Specifically, please refer to the above description for the PAA material and the PI material, which is not repeated herein. In this embodiment, the "mixing the PAA material and the PI material in a ratio to prepare the first alignment solution" specifically includes:
and mixing the PAA material and the PI material according to a ratio of 5:5 to prepare the first alignment liquid.
As can be understood, the proportion of the PI material in the first alignment liquid ranges from 20% to 100%; further, the ratio of the PI material in the first alignment solution may also be in a range of 40% to 80%, which is not limited in this application.
In one possible embodiment, referring to fig. 2 and fig. 3 again, the display panel 1 includes an array substrate 13 and a color film substrate 14, and the method for preparing an alignment layer further includes:
presetting that the first alignment region covers the part of the array substrate 13 corresponding to the display region 1a, and presetting that the second alignment region covers the part of the array substrate 13 corresponding to the non-display region 1 b;
presetting a third alignment region on the color film substrate 14, wherein the third alignment region completely covers the parts of the color film substrate 14 corresponding to the display region 1a and the non-display region 1 b;
arranging the first alignment liquid in the third alignment area; or,
presetting a part of the color film substrate 14 corresponding to the display area 1a covered by the first alignment area, and presetting a part of the color film substrate 14 corresponding to the non-display area 1b covered by the second alignment area;
presetting a third alignment region on the array substrate 13, wherein the third alignment region completely covers the parts of the array substrate 13 corresponding to the display region 1a and the non-display region 1 b;
and arranging the first alignment liquid in the third alignment area.
Specifically, please refer to the above description for the array substrate 13 and the color filter substrate 14, which is not repeated herein. In this embodiment, the first alignment liquid is disposed in the third alignment region, so that the first alignment film 11 disposed in the portion of the color film substrate 14 corresponding to the display region 1a and the first alignment film 11 disposed in the portion of the color film substrate 14 corresponding to the non-display region 1b are integrated; or, the first alignment film 11 disposed on the portion of the array substrate 13 corresponding to the display region 1a and the first alignment film 11 disposed on the portion of the array substrate 13 corresponding to the non-display region 1b are integrated.
In one possible embodiment, referring to fig. 4 again, the display panel 1 includes an array substrate 13 and a color film substrate 14, and the method for preparing an alignment layer further includes:
the first alignment region is preset to cover the array substrate 13 and the color film substrate 14 corresponding to the display region 1a, and the second alignment region is preset to cover the array substrate 13 and the color film substrate 14 corresponding to the non-display region 1 b.
Specifically, the difference between this embodiment and the previous embodiment is that the first alignment liquid is disposed in the first alignment region, and the formed first alignment film 11 is disposed in the array substrate 13 and the color filter substrate 14 at the portion of the display region 1 a.
The principle and the embodiment of the present application are explained herein by applying specific examples, and the above description of the embodiment is only used to help understand the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, the specific implementation manner and the application scope may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (8)
1. The display panel is characterized by comprising a first alignment film and a second alignment film, wherein the display panel is provided with a display area and a non-display area, the first alignment film completely covers the display area and extends at least partially towards the non-display area, the second alignment film covers at least part of the non-display area and is arranged around the first alignment film, the ion adsorption capacity of the second alignment film is greater than that of the first alignment film, and the adhesion force of the second alignment film is greater than that of the first alignment film; the first alignment film is composed of a PAA material and a PI material, and the second alignment film is composed of a PAA material.
2. The display panel according to claim 1, wherein the first alignment film extends toward the non-display region by a distance in a range of 0.2mm to 1 mm.
3. The display panel of claim 1, wherein the second alignment film covers at least 50% of the non-display region.
4. The display panel according to claim 1, wherein the display panel further includes an array substrate and a color film substrate that are stacked, the first alignment film is disposed on a portion of the array substrate corresponding to the display region and extends at least partially toward a portion of the array substrate corresponding to the non-display region, the second alignment film is disposed on a portion of the array substrate corresponding to the non-display region, and the first alignment film is further disposed on a portion of the color film substrate corresponding to the display region and the non-display region; or,
the first alignment film is arranged on the portion, corresponding to the display area, of the color film substrate and extends at least partially to the portion, corresponding to the non-display area, of the color film substrate, the second alignment film is arranged on the portion, corresponding to the non-display area, of the color film substrate, and the first alignment film is further arranged on the portion, corresponding to the display area and the non-display area, of the array substrate.
5. The display panel of claim 1, wherein the display panel further comprises an array substrate and a color filter substrate which are stacked, the first alignment film is disposed on the array substrate and the color filter substrate corresponding to the display area and extends at least partially to the array substrate and the color filter substrate corresponding to the non-display area, and the second alignment film is disposed on the array substrate and the color filter substrate corresponding to the non-display area.
6. A preparation method of an alignment film is applied to a display panel, the display panel is provided with a display area and a non-display area, and the non-display area is arranged in the display area in a surrounding mode, and the preparation method of the alignment film is characterized by comprising the following steps:
presetting a first alignment area on the display panel, wherein the first alignment area completely covers the display area and extends at least partially to the non-display area;
presetting a second alignment area on the display panel, wherein the second alignment area covers at least part of the non-display area and is arranged around the first alignment area;
providing a first alignment liquid and a second alignment liquid;
providing a PAA material and a PI material;
mixing the PAA material and the PI material in proportion to prepare the first alignment liquid;
preparing the PAA material into the second alignment liquid;
and arranging the first alignment liquid in the first alignment area to form a first alignment film, and arranging the second alignment liquid in the second alignment area to form a second alignment film, wherein the ion adsorption capacity of the second alignment film is greater than that of the first alignment film, and the adhesion force of the second alignment film is greater than that of the first alignment film.
7. The method for preparing an alignment film according to claim 6, wherein the display panel comprises an array substrate and a color film substrate which are stacked, the first alignment region is preset to cover a portion of the array substrate corresponding to the display region, and the second alignment region is preset to cover a portion of the array substrate corresponding to the non-display region;
presetting a third alignment region on the color film substrate, wherein the third alignment region completely covers the parts of the color film substrate corresponding to the display region and the non-display region;
arranging the first alignment liquid in the third alignment area; or,
presetting a part of the color film substrate corresponding to the display area, which is covered by the first alignment area, and presetting a part of the color film substrate corresponding to the non-display area, which is covered by the second alignment area;
presetting a third alignment region on the array substrate, wherein the third alignment region completely covers the part of the array substrate corresponding to the display region and the non-display region;
and arranging the first alignment liquid in the third alignment area.
8. The method for preparing an alignment film according to claim 6, wherein the display panel comprises an array substrate and a color film substrate which are stacked, and the method for preparing an alignment film further comprises:
presetting the first alignment region to cover the array substrate and the color film substrate corresponding to the display region, and presetting the second alignment region to cover the array substrate and the color film substrate corresponding to the non-display region.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210455216.1A CN114545688B (en) | 2022-04-28 | 2022-04-28 | Display panel and alignment film preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210455216.1A CN114545688B (en) | 2022-04-28 | 2022-04-28 | Display panel and alignment film preparation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114545688A CN114545688A (en) | 2022-05-27 |
| CN114545688B true CN114545688B (en) | 2022-08-09 |
Family
ID=81667722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210455216.1A Active CN114545688B (en) | 2022-04-28 | 2022-04-28 | Display panel and alignment film preparation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114545688B (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62231222A (en) * | 1986-03-31 | 1987-10-09 | Nitto Electric Ind Co Ltd | Solution for forming orientation film of liquid crystal |
| JP5151554B2 (en) * | 2007-04-13 | 2013-02-27 | Ｎｌｔテクノロジー株式会社 | Liquid crystal display device and manufacturing method thereof |
| CN105670494B (en) * | 2016-01-29 | 2018-06-29 | 京东方科技集团股份有限公司 | Orientation film layer solution and preparation method thereof, display base plate and preparation method thereof |
| CN107991815B (en) * | 2018-01-29 | 2020-09-04 | 深圳市华星光电技术有限公司 | Manufacturing method of alignment film, liquid crystal display panel and liquid crystal display |
| CN210691000U (en) * | 2019-11-21 | 2020-06-05 | 昆山龙腾光电股份有限公司 | Narrow-frame liquid crystal display panel and liquid crystal display device |
| CN111240104A (en) * | 2020-03-19 | 2020-06-05 | Tcl华星光电技术有限公司 | Display panel and preparation method thereof |
| CN113359355B (en) * | 2021-06-09 | 2022-07-29 | 深圳市华星光电半导体显示技术有限公司 | Liquid crystal display panel and display device |
-
2022
- 2022-04-28 CN CN202210455216.1A patent/CN114545688B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN114545688A (en) | 2022-05-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7999467B2 (en) | Display device and manufacturing method thereof for minimizing inflow of oxygen and moisture from the outside | |
| KR100794841B1 (en) | Seal structure, seal method, liquid crystal device, manufacturing method and projector | |
| JP2004163951A (en) | Substrate for liquid crystal display device | |
| US20090109369A1 (en) | Liquid crystal display device | |
| KR101247680B1 (en) | Electrophoretic Display Device and Method for Manufacturing thereof | |
| JP3815149B2 (en) | Component mounting method and electro-optical device manufacturing method | |
| US8023083B2 (en) | Liquid crystal device, method for manufacturing the same, and electronic apparatus including the same | |
| JP2008209529A (en) | Liquid crystal display and its manufacturing method | |
| US20180275437A1 (en) | Display panel and method of producing display panel | |
| JP4354948B2 (en) | Method for forming alignment film of liquid crystal display device | |
| CN114545688B (en) | Display panel and alignment film preparation method | |
| JP4623685B2 (en) | Manufacturing method of display device | |
| JP5059111B2 (en) | Liquid crystal display device and manufacturing method thereof | |
| CN1475848A (en) | Liquid crystal device, manufacturing method of liquid crystal device, and electronic device | |
| US8908142B2 (en) | Liquid crystal panel and manufacturing method thereof | |
| CN1324372C (en) | Liquid crystal element, manufacture thereof and electronic device | |
| JP2004117526A (en) | Liquid crystal display panel and method for manufacturing the same | |
| JP2008020541A (en) | Liquid crystal display device and its manufacturing method | |
| JP2009092766A (en) | Display device and its manufacturing method | |
| JP2008275806A (en) | Method for fabricating display device | |
| JPH11119221A (en) | Production of liquid crystal display device | |
| CN2704059Y (en) | Liquid crystal device and electronic device | |
| JP2009251565A (en) | Method for manufacturing liquid crystal display device | |
| CN112285965B (en) | Liquid crystal display panel and method for manufacturing the same | |
| KR101328013B1 (en) | Tape automated bonding process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |