CN113764500A - Display panel and preparation method thereof - Google Patents

Display panel and preparation method thereof Download PDF

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Publication number
CN113764500A
CN113764500A CN202111107174.4A CN202111107174A CN113764500A CN 113764500 A CN113764500 A CN 113764500A CN 202111107174 A CN202111107174 A CN 202111107174A CN 113764500 A CN113764500 A CN 113764500A
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China
Prior art keywords
sub
display area
pixel
functional film
film layer
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CN202111107174.4A
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Chinese (zh)
Inventor
金广
孔超
曹鹏
李金钰
张建超
朱运遥
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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Priority to CN202111107174.4A priority Critical patent/CN113764500A/en
Publication of CN113764500A publication Critical patent/CN113764500A/en
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/868—Arrangements for polarized light emission
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
    • H10K59/352—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels the areas of the RGB subpixels being different
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
    • H10K59/353—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels characterised by the geometrical arrangement of the RGB subpixels
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K77/00—Constructional details of devices covered by this subclass and not covered by groups H10K10/80, H10K30/80, H10K50/80 or H10K59/80
    • H10K77/10—Substrates, e.g. flexible substrates
    • H10K77/111—Flexible substrates
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/549—Organic PV cells

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

Abstract

The disclosure relates to a display panel and a preparation method thereof, wherein a functional film layer in a planar display area of the display panel is not affected by bending stress, the light transmittance of sub-pixels with different colors is low, the luminance of at least part of sub-pixels with at least one color is equal to the target luminance, and no color cast is normally displayed; the functional film layer of the bending display area of the display panel can be subjected to certain bending stress, along with the increase of the bending angle of the bending display area, light emitted by at least part of sub-pixels of at least one color of the bending display area passes through the functional film layer, the transmittance is increased compared with that of the plane display area, and after the transmittance of part of sub-pixels of the bending display area is increased, the brightness ratio of light of different colors of the bending display area can be consistent with that of light of different colors of the plane display area, so that the phenomena of color cast such as yellowing and greening of the bending display area can be eliminated, and the effect of improving the color cast of the bending display area is achieved.

Description

Display panel and preparation method thereof
Technical Field
The disclosure relates to the technical field of display, in particular to a display panel and a preparation method thereof.
Background
An Active-matrix organic light emitting diode (AMOLED) panel is widely applied to the fields of mobile phones, wearable devices, and the like because of its advantages of being bendable and foldable.
Generally, a flexible display panel includes a flat display area and a bending display area, but the bending display area of the flexible display panel is often accompanied by color cast phenomena such as yellowing and greening, which causes undesirable phenomena such as color cast of the bending display area.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
The present disclosure is directed to overcoming a display color shift phenomenon occurring in a conventional bent display region, and provides a display panel and a method for manufacturing the same.
According to one aspect of the present disclosure, a display panel is provided, which has a bending display area, and further includes a flexible substrate, a plurality of pixel units and a functional film layer, wherein the plurality of pixel units are arranged on one side of the flexible substrate in an array manner, the pixel units include sub-pixels of a plurality of different colors, and the luminance of at least part of the sub-pixels of at least one color is greater than a target luminance; the functional film layer is arranged on one side, away from the flexible substrate, of at least part of the sub-pixels of at least one color, the functional film layer is subjected to tensile stress proportional to a bending angle in the bending display area, the light transmittance of the functional film layer is increased along with the increase of the tensile stress, and the light emitting brightness of the at least part of the sub-pixels of at least one color after penetrating through the functional film layer is equal to the target brightness, so that the brightness of the light of the sub-pixels of different colors in the bending display area is consistent with the brightness ratio of the light of the sub-pixels of different colors in the plane display area.
In one embodiment of the disclosure, the functional film layer is provided with an opening, and an orthographic projection of the opening on the flexible substrate is overlapped with an orthographic projection of at least part of the sub-pixels of at least one color on the flexible substrate.
In one embodiment of the present disclosure, the plurality of different color sub-pixels includes a first color sub-pixel, a second color sub-pixel, and a third color sub-pixel, and a forward projection of the opening on the flexible substrate overlaps with a forward projection of at least a portion of the first color sub-pixel and at least a portion of the second color sub-pixel on the flexible substrate.
In one embodiment of the present disclosure, the first color sub-pixel is a red sub-pixel, the second color sub-pixel is a green sub-pixel, and the third color sub-pixel is a blue sub-pixel.
In one embodiment of the present disclosure, the functional film layer includes a transparent elastic substrate having first and second oppositely disposed faces with a gathered layer on the first face.
In one embodiment of the present disclosure, the material of the transparent elastic substrate comprises polysiloxane, and the material of the wrinkle layer comprises polyvinyl alcohol alkene.
In one embodiment of the present disclosure, the transparent elastic substrate has a light transmittance of greater than 90%.
In one embodiment of the present disclosure, the thickness of the functional film layer is in the range of 100-1000 microns.
In one embodiment of the present disclosure, the functional film layer has a tensile stress in a range of 30 to 50 megapascals.
According to another aspect of the present disclosure, there is provided a method of manufacturing a display panel, including:
providing a flexible substrate, and arranging a plurality of pixel units on one side of the flexible substrate in an array manner;
arranging a functional film layer prepared in advance on one side of at least part of the pixel units away from the flexible substrate;
the preparation of the functional film layer comprises the following steps:
providing a transparent elastic substrate, and pretreating at least the first surface of the transparent elastic substrate;
a corrugated layer is formed on the first surface.
According to the display panel, the pixel unit comprises the sub-pixels with various different colors, the functional film layer is arranged on one side, away from the flexible substrate, of at least part of the sub-pixels with at least one color, and the light transmittance of the functional film layer is increased along with the increase of the bending stress of the bending display area. The functional film layer of the plane display area is not affected by bending stress, the light transmittance of the sub-pixels with different colors is low, the luminance of at least part of the sub-pixels with at least one color is equal to the target luminance, and no color cast is normally displayed; the functional film layer of the bending display area can be subjected to certain bending stress, along with the increase of the bending angle of the bending display area, light emitted by at least part of sub-pixels of at least one color of the bending display area passes through the functional film layer, the transmittance is increased compared with that of the plane display area, and after the transmittance of part of sub-pixels of the bending display area is increased, the luminance ratio of light of different colors of the bending display area can be consistent with that of light of different colors of the plane display area, so that the phenomena of color cast such as yellowing and greening of the bending display area can be eliminated, and the effect of improving the color cast of the bending display area is achieved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.
Fig. 1 is a spectrum diagram of a state in which a cover glass is present or absent when a bending angle of a display panel in the related art is 0 degree.
Fig. 2 is a spectrum diagram of a state in which the display panel is bent at an angle of 45 degrees with or without the cover glass in the related art.
Fig. 3 is a spectrum diagram illustrating a state of the display panel with or without the cover glass when the display panel is bent at an angle of 60 degrees according to the related art.
FIG. 4 is a schematic diagram illustrating transmittance attenuation of a display panel with a polarizer when the display panel is bent according to the related art.
Fig. 5 is a spectrum diagram of 0 degree and 60 degree when the display panel is bent in a state of having a polarizer in the related art.
Fig. 6 is a diagram illustrating a relationship between a bending angle of a display panel and a stress of a functional film according to an embodiment of the disclosure.
Fig. 7 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure.
Fig. 8 is a schematic structural diagram of a functional film layer according to an embodiment of the disclosure.
Fig. 9 is a schematic plan structure diagram of a pixel unit according to an embodiment of the present disclosure.
Fig. 10 is a graph illustrating a relationship between a tensile stress applied to the functional film layer and a blue light transmittance according to an embodiment of the disclosure.
Fig. 11 is a flowchart of a method for manufacturing a display panel according to an embodiment of the present disclosure.
In the figure: 1-functional film layer, 11-transparent elastic substrate, 12-wrinkled layer, 121-opening, 2-polarizer, 3-flat layer, 4-pixel unit, 41-red sub-pixel, 42-blue sub-pixel, 43-green sub-pixel and 5-flexible substrate.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.
Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.
The terms "a," "an," "the," "said," and "at least one" are used to indicate the presence of one or more elements/components/parts/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.; the terms "first," "second," and "third," etc. are used merely as labels, and are not limiting on the number of their objects.
In the related art, the flexible display panel includes a flat display area and a bent display area, and structures such as an encapsulation layer, a polarizer, cover glass, etc. are prepared on the light emitting unit, and the absorption intensities of the encapsulation layer, the polarizer, the cover glass, etc. on the light emitting unit are not consistent to red, green, and blue light. For the flat display area, the distance, the path, the light-emitting angle and the like of the light emitted by the light-emitting unit positioned in the bent display area through the structures such as the packaging layer, the polaroid, the cover plate glass and the like can be changed, along with the increase of the bending angle of the bent display area, the absorption proportion of the structures such as the packaging layer, the polaroid, the cover plate glass and the like to certain color light is enhanced, the proportion of red, green and blue synthesized white light is unbalanced, and when people observe the bent display area, the color cast phenomenon can occur.
Fig. 1 to fig. 3 are schematic diagrams of normalized light transmittance spectrums of three colors of red, green and blue of a light emitting unit under different bending angles under the influence of cover glass, wherein wave forms of blue light, green light and red light are sequentially arranged at wave peaks from left to right in the diagrams.
As shown in fig. 1, the spectrum of the display panel in the state of the presence or absence of the cover glass when the display panel is not bent. Compared with the flexible display panel with the cover glass before and after the cover glass is added, the waveform curve of the blue light is superposed with the waveform curve of the flexible display panel without the cover glass, and the waveform curves of the red light and the green light are slightly increased compared with the waveform curve of the flexible display panel without the cover glass. Therefore, the proportion of the blue light in the mixed light is slightly reduced compared with the mixed light without the cover glass, and the proportion of the red light and the green light is slightly increased compared with the mixed light without the cover glass. It can be understood that when the cover plate glass is not arranged, the difference of the transmittance of the red light, the transmittance of the green light and the transmittance of the blue light of the bent display area are smaller, the transmittance of the blue light is slightly reduced relative to the transmittance of the red light and the transmittance of the green light, and the difference of the transmittance of the red light, the transmittance of the green light and the transmittance of the blue light of the bent display area is increased.
Fig. 2 is a spectrum diagram showing a state of the display panel with or without the cover glass when the display panel is bent at an angle of 45 degrees, and fig. 3 is a spectrum diagram showing a state of the display panel with or without the cover glass when the display panel is bent at an angle of 60 degrees. It can be seen that, with the flexible display panel added with the cover glass, as the bending angle of the bending display area increases, the waveform curve of the blue light is superposed with the waveform curve of the non-cover glass, and the waveform curves of the red light and the green light are raised more than those of the non-cover glass. Therefore, the proportion of the blue light in the mixed light is reduced more than that of the mixed light without the cover plate glass, and the proportion of the red light and the green light is increased more than that of the mixed light without the cover plate glass. It can be understood that the attenuation of the blue light transmittance of the bent display area is serious, and the attenuation of the red light transmittance and the green light transmittance is less, so that the proportion of the red light, the green light transmittance and the blue light transmittance of the bent display area to synthesize white light is unbalanced, and the bent display area has abnormal yellow emission.
As shown in fig. 4, under the influence of the polarizer, the transmittances of red light, green light and blue light in the bent display area are all attenuated to a certain extent as the bending angle of the bent display area increases, but the transmittance attenuation of the blue light is the greatest, which aggravates the display yellowing phenomenon in the bent display area.
Fig. 5 is a diagram of normalized photometry spectrum of the display panel with the polarizer in the state, the flat display area and the bending display area bent by 60 degrees, wherein the wave forms of blue light, green light and red light are sequentially arranged at the wave crest from left to right in the diagram. As shown in fig. 5, when the display panel is bent by 60 degrees, the waveform curve of the blue light is much lower than that of the flat display area, and the waveform curves of the red light and the green light are greatly increased. Therefore, the proportion of the blue light in the mixed light is greatly reduced compared with the mixed light without the cover glass, and the proportion of the red light and the green light is greatly increased compared with the mixed light without the cover glass. The attenuation degree of the blue light is most obvious, and the blue light in the RGB three primary colors of the white light synthesized by the bent display area is less, so that the display color of the bent display area is yellow.
Generally, the display generates a certain tensile stress when being bent, and the tensile stress gradually increases as the bending angle increases. The elastic modulus of the display panel provided by the embodiment is 4.076GPa, the flexible display panel is bent at a certain angle and is kept still for 300 seconds, and the tensile stress of the display panel is tested. As shown in fig. 6, when the bending radius of curvature of the display is 10mm, the tensile stress gradually increases as the bending angle increases, and when the bending angle is 75 degrees, the tensile stress reaches about 18 mpa.
In order to improve the color cast of the display panel in the bent display area, a functional film layer for regulating and controlling the light transmittance by tensile stress is additionally arranged between the polarizer and the light-emitting unit or on the other side of the polarizer of the display panel. The functional film layer can effectively adjust the light transmittance by changing the surface appearance, change the surface appearance of the material by tensile stress, and adjust and control the number of folds on the surface of the material, thereby achieving the purpose of adjusting and controlling the light transmittance.
As shown in fig. 7 to 10, the present disclosure provides a display panel having a bending display area and a flat display area, the display panel further includes a flexible substrate 5, a plurality of pixel units 4 and a functional film layer 1, the plurality of pixel units 4 are arranged on one side of the flexible substrate 5 in an array, the pixel units 4 include sub-pixels of a plurality of different colors, and at least a part of the sub-pixels of at least one color have a luminance greater than a target luminance; the functional film layer 1 is arranged on one side, away from the flexible substrate 5, of at least part of the sub-pixels of at least one color, the functional film layer 1 is subjected to tensile stress proportional to a bending angle in the bending display area, the light transmittance of the functional film layer 1 is increased along with the increase of the tensile stress, and the light emitting brightness of the at least part of the sub-pixels of at least one color after penetrating through the functional film layer 1 is equal to the target brightness, so that the ratio of the light brightness of the sub-pixels of different colors in the bending display area to the light brightness of the sub-pixels of different colors in the plane display area is consistent.
The functional film layer 1 in the plane display area is not affected by bending stress, the light transmittance of the sub-pixels with different colors is low, the luminance of at least part of the sub-pixels with at least one color is equal to the target luminance, and no color cast is displayed normally; the functional film layer 1 of the bending display area can be subjected to certain bending stress, along with the increase of the bending angle of the bending display area, light emitted by at least part of sub-pixels of at least one color of the bending display area passes through the functional film layer 1, the transmittance is increased compared with that of the plane display area, and after the transmittance of part of sub-pixels of the bending display area is increased, the brightness ratio of light of different colors of the bending display area can be consistent with that of light of different colors of the plane display area, so that the phenomena of color cast such as yellowing and greenness of the bending display area can be eliminated, and the effect of improving the color cast of the bending display area is achieved.
As shown in fig. 7 to 9, the present disclosure provides a display panel having a flat display area and a bent display area, the display panel includes a flexible substrate 5, a plurality of pixel units 4, a polarizer 2 and a functional film 1, the plurality of pixel units 4 are arranged on one side of the flexible substrate 5 in an array, each pixel unit 4 includes a red sub-pixel 41, a green sub-pixel 43 and a blue sub-pixel 42, and the luminance of the blue sub-pixel 42 is greater than a target luminance; the polaroid 2 is arranged on one side of the pixel units 4 far away from the flexible substrate 5; the functional film layer 1 is arranged between the polarizer 2 and the plurality of pixel units 4 or on one side of the polarizer 2 far away from the flexible substrate 5, and the light transmittance of the functional film layer 1 in the flat display area is smaller than that in the bending display area. The luminance of the blue sub-pixel 42 of the functional film layer 1 in the flat display area is equal to the target luminance, the transmittance of the functional film layer 1 in the bending display area is increased along with the increase of the bending stress, and the luminance of the blue sub-pixel 42 after passing through the functional film layer 1 is equal to the target luminance, so that the luminance of the sub-pixels of the three colors in the bending display area is consistent with the luminance ratio of the sub-pixels of the three colors in the flat display area.
It should be noted that the pixel unit 4 may include a thin film transistor, an anode, a cathode, and a light emitting unit, which are distributed on the flexible substrate 5 in an array, where the anode is connected to a drain of the thin film transistor, the anode is connected to an anode of a power supply, the cathode is connected to a cathode of the power supply, the light emitting unit is located between the anode and the cathode, and the light emitting unit may emit red light, green light, and blue light. In order to facilitate the arrangement of the polarizer 2, a planarization layer 3 may be arranged on the plurality of pixel units 4.
The target brightness refers to the brightness of the blue sub-pixel 42 when the functional film layer 1 is not disposed, and the ratio of the red light, the green light and the blue light to synthesize white light can be synthesized in the flat display area. In the flat display area, the portion of the blue sub-pixel 42 emitting light with a luminance exceeding the target luminance can eliminate the weakening of the blue transmittance by the functional film layer 1, so that the light emitted by the blue sub-pixel 42 is equal to the target luminance after passing through the unstressed functional film layer 1.
The luminance of the blue sub-pixel 42 is higher than the target luminance, in the flat display area, the functional film layer 1 is not affected by the tensile stress, the light transmittance of the blue sub-pixel 42 is small, the weakening of the blue light transmittance by the functional film layer 1 is neutralized with the increase of the luminance of the blue sub-pixel 42, and therefore, the display of the flat display area is not affected. In the display area of buckling, function rete 1 can receive certain tensile stress, along with the increase of the display area angle of buckling, the light that blue subpixel 42 sent compares the planar display area increase through function rete 1 back, the transmissivity can compensate the blue light transmissivity that leads to because of polaroid 2 and descends, the proportion of the synthetic white light of ruddiness, green glow, the blue light trichrome of buckling the display area tends to balance again, can eliminate the display area of buckling's phenomenons such as yellow, give off green, reach the effect of improving the display area colour cast of buckling.
The functional film layer 1 comprises a transparent elastic substrate 11 and a wrinkle layer 12, wherein the transparent elastic substrate 11 is provided with a first surface and a second surface which are oppositely arranged, the wrinkle layer 12 is arranged on the first surface of the transparent elastic substrate 11, the wrinkle layer 12 is provided with a plurality of openings 121, and the light transmittance of the wrinkle layer 12 is related to the tensile stress generated by the wrinkle layer. The orthographic projection of the red sub-pixel 41 and the green sub-pixel 43 on the flexible substrate 5 is positioned in the orthographic projection of the plurality of openings 121 on the flexible substrate 5, and the orthographic projection of the blue sub-pixel 42 on the flexible substrate 5 is positioned outside the orthographic projection of the plurality of openings 121 on the flexible substrate 5.
The transparent elastic substrate 11 may be made of transparent silicone, transparent acrylic (pma), transparent polyurethane or transparent chitosan (cs), and the wrinkle layer 12 may be made of polyvinyl alcohol. It is noted that the transparency of the transparent elastic substrate 11 is ninety percent or more. Generally, the thickness of the functional film layer 1 is between 100 and 1000 microns, and the tensile stress is 30-50 MPa.
Fig. 10 is a schematic diagram of a relationship between a tensile stress applied to the functional film layer 1 and a light transmittance emitted by the blue subpixel 42, where the transmittance of the functional film layer 1 changes under the tensile stress, and the light transmittance of the functional film layer 1 in a visible light range increases first and then decreases with the increase of the tensile stress. The tensile stress corresponding to the tensile elongation with the highest transmittance is σ, σ is about 20 megapascals, and when the tensile stress is less than σ, the light transmittance increases with the increase of the tensile stress; when the tensile stress is greater than σ, the light transmittance decreases as the tensile stress increases.
It is understood that in the flat display region, the functional film layer 1 is not affected by tensile stress, and has fifty percent of light transmittance for the blue sub-pixel 42. In the bending display area, as the tensile stress applied to the functional film layer 1 increases, the light transmittance emitted to the blue sub-pixel 42 can be increased to more than ninety percent, and the light transmittance increases by more than fifty percent, so that the attenuation of the blue light transmittance by the polarizer can be completely neutralized.
Generally, the tensile stress of the functional film layer in the bending display area may be greater than or equal to 10 mpa and less than or equal to 30 mpa, and the tensile stress of the functional film layer in the planar display area may be greater than or equal to 0 mpa and less than or equal to 5 mpa. The light transmittance of the functional film layer in the bending display area can be greater than or equal to 85% and less than or equal to 95%, and the light transmittance of the functional film layer in the plane display area can be greater than or equal to 50% and less than or equal to 70%.
When the tensile stress of the functional film layer 1 in the bending display area is more than or equal to 10 MPa and less than or equal to 30 MPa, the light transmittance of the functional film layer in the bending display area is more than or equal to 85% and less than or equal to 95%; when the tensile stress of the flat display area is more than or equal to 0 MPa and less than or equal to 5 MPa, the light transmittance of the functional film layer in the flat display area is more than or equal to 50% and less than or equal to 70%.
The functional film layer 1 may be disposed between the polarizer 2 and the plurality of pixel units 4 or on a side of the polarizer 2 away from the flexible substrate 5 in a pre-stretching and attaching manner. It will be appreciated that the magnitude of the pre-stretching tension may be in the range 4 to 20 mpa, with a typical pre-stretching tension setting of 5 mpa. The pre-stretching and laminating mode has the significance that when the bending display area is bent by a small angle, the stress of the functional film layer 1 is small, and the attenuation of the blue light transmittance caused by the bending of the polarizer 2 cannot be completely offset by the increase of the blue light transmittance. Therefore, a node where the transmittance of the functional film layer 1 to blue light is increased rapidly, for example, the transmittance corresponding to 20 mpa, is achieved through the pre-stretching tension, so that the increase of the transmittance of the functional film layer 1 to blue light can completely offset the attenuation of the transmittance of the polarizer 2 to blue light by bending.
As shown in fig. 11, the present disclosure provides a method for manufacturing a display panel, including:
step S10, providing a flexible substrate 5, and arranging a plurality of pixel units 4 in an array on one side of the flexible substrate 5;
step S20, disposing a pre-prepared functional film layer on a side of at least some of the pixel units 4 away from the flexible substrate 5, the preparation of the functional film layer including: providing a transparent elastic substrate 11, and pretreating at least a first surface of the transparent elastic substrate 11; a corrugated layer 12 is formed on the first side.
The preparation of the functional film layer may further include: a plurality of openings 121 are formed in the corrugated layer 12.
In practice, the corrugated layer 12 is disposed only on the first surface of the transparent elastic substrate 11, and therefore the first surface of the transparent elastic substrate 11 may be pretreated, mainly for enhancing the bonding performance of the first surface to the corrugated layer 12.
In this embodiment, the material of the transparent elastic substrate 11 may be polysiloxane, and the pretreatment at least on the first surface of the transparent elastic substrate 11 includes: the transparent elastic substrate 11 is oxidized by oxygen plasma. In other embodiments, the transparent elastic substrate 11 may also be etched with strong bases including, but not limited to, potassium hydroxide and sodium hydroxide.
Forming a corrugated layer 12 on the first face, comprising: forming a polyvinyl alcohol alkene layer on the first surface, patterning the polyvinyl alcohol alkene layer, and forming a double-layer film by the patterned polyvinyl alcohol alkene layer and the transparent elastic substrate 11; and applying tensile force to two opposite ends of the double-layer film to enable the patterned polyvinyl alcohol alkene layer to generate strain and then release the strain, so that the polyvinyl alcohol alkene layer is formed into the wrinkle layer 12.
A layer of polyvinyl alcohol alkene solution with certain morphology is formed on the transparent elastic surface in an ink-jet printing mode, and after heating and curing, a rigid and elastic double-layer film with a certain shape is prepared. In addition to the inkjet printing method, a spin coating method may be used instead.
Forming the polyvinyl alcohol olefin layer on the first side may include: 3-10 wt% of polyvinyl alcohol alkene solution is dripped on the transparent elastic substrate 11 and dried, and the drying temperature can be generally set to 80 ℃.
The tensile stress applied to both ends of the bilayer film is related to the thickness of the bilayer film, and generally the thicker the bilayer film, the greater the tensile stress. The pressure applied across the bilayer is of such an amount that it is strained from 5% to 15%, and preferably may be 10%. In the embodiment, the thickness of the functional film layer 1 may be 100-1000 μm, and correspondingly, the tensile stress may be 30-50 mpa.
The disclosed embodiments provide a display device, which may include the above display panel. The detailed structure of the display panel has already been described above, and therefore, the detailed description thereof is omitted here.
It should be noted that the display device includes other necessary components and components besides the display panel, taking the display as an example, specifically, such as a housing, a circuit board, a power line, and the like, and those skilled in the art can supplement the display device accordingly according to the specific use requirements of the display device, and details are not described herein.
The display device may be a conventional electronic device, for example: cell phones, computers, televisions, video recorders and video players, as well as emerging wearable devices such as VR glasses, not to mention here.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims (10)

1. A display panel having a bend display region and a flat display region, the display panel comprising:
a flexible substrate;
the pixel units are arranged on one side of the flexible substrate in an array mode and comprise sub-pixels with various colors, and the light emitting brightness of at least part of sub-pixels with at least one color is larger than target brightness;
and the functional film layer is arranged on one side of at least part of the sub-pixels of at least one color, which is far away from the flexible substrate, and is subjected to tensile stress proportional to a bending angle in the bending display area, the light transmittance of the functional film layer is increased along with the increase of the tensile stress, and the light-emitting brightness of at least part of the sub-pixels of at least one color after penetrating through the functional film layer is equal to the target brightness, so that the brightness of the sub-pixels of different colors in the bending display area is consistent with the brightness of the sub-pixels of different colors in the plane display area.
2. The display panel according to claim 1, wherein the functional film layer is provided with an opening, and an orthographic projection of the opening on the flexible substrate overlaps with an orthographic projection of at least part of the sub-pixels of at least one color on the flexible substrate.
3. The display panel according to claim 1 or 2, wherein the plurality of different color sub-pixels comprises a first color sub-pixel, a second color sub-pixel and a third color sub-pixel, and wherein an orthographic projection of the opening on the flexible substrate overlaps with an orthographic projection of at least a portion of the first color sub-pixel and at least a portion of the second color sub-pixel on the flexible substrate.
4. The display panel of claim 3, wherein the first color sub-pixel is a red sub-pixel, the second color sub-pixel is a green sub-pixel, and the third color sub-pixel is a blue sub-pixel.
5. The display panel of claim 1, wherein the functional film layer comprises a transparent elastic substrate having a first side and a second side disposed opposite to each other, and wherein the first side has a corrugated layer thereon.
6. The display panel according to claim 5, wherein the material of the transparent elastic substrate comprises polysiloxane, and the material of the wrinkle layer comprises polyvinyl alcohol alkene.
7. The display panel of claim 5, wherein the transparent elastic substrate has a light transmittance of greater than 90%.
8. The display panel of claim 1, wherein the thickness of the functional film layer is in the range of 100-1000 μm.
9. The display panel of claim 1, wherein the functional film layer has a tensile stress in a range of 30-50 mpa.
10. A method for manufacturing a display panel, comprising:
providing a flexible substrate, and arranging a plurality of pixel units on one side of the flexible substrate in an array manner;
arranging a pre-prepared functional film layer on one side of at least part of the pixel units away from the flexible substrate;
the preparation of the functional film layer comprises the following steps:
providing a transparent elastic substrate, and pretreating at least a first surface of the transparent elastic substrate;
and forming a wrinkle layer on the first surface.
CN202111107174.4A 2021-09-22 2021-09-22 Display panel and preparation method thereof Pending CN113764500A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117835725A (en) * 2024-03-05 2024-04-05 惠科股份有限公司 Flexible display panel and display device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117835725A (en) * 2024-03-05 2024-04-05 惠科股份有限公司 Flexible display panel and display device
CN117835725B (en) * 2024-03-05 2024-05-24 惠科股份有限公司 Flexible display panel and display device

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