CN111723766A - Display module, preparation method thereof and display terminal - Google Patents
Display module, preparation method thereof and display terminal Download PDFInfo
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- CN111723766A CN111723766A CN202010605227.4A CN202010605227A CN111723766A CN 111723766 A CN111723766 A CN 111723766A CN 202010605227 A CN202010605227 A CN 202010605227A CN 111723766 A CN111723766 A CN 111723766A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
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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
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Abstract
The invention provides a display module, comprising: the display screen comprises a fingerprint identification area and a non-fingerprint identification area; the bonding support layer is positioned on one side, away from the display light emitting side, of the display screen and comprises a through opening, and the projection of the through opening on the display screen is covered by the fingerprint identification area; and the transparent reflection compensation film layer is positioned in the opening and attached to the side, away from the display light emitting side, of the display screen, and the absolute value of the difference between the blue light waveband reflectivity at the interface of the transparent reflection compensation film layer and the display screen and the blue light waveband reflectivity at the non-opening area of the bonding support layer and the interface of the display screen is smaller than or equal to a preset value. Set up transparent reflection compensation rete, fingerprint identification region and non-fingerprint identification region have the difference in blue light wave band reflectivity of predetermineeing the within range, effectively reduce Mura and obvious marginal problem.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display module, a preparation method thereof and a display terminal.
Background
With the development of display technology, the underscreen finger print is receiving much attention. No matter traditional fingerprint unblock is the unblock of front scraping or the mode of pressing unblock, all can reduce the screen and account for the ratio, influence user experience, even back unblock also can influence cell-phone aesthetic property, consequently, the fingerprint should be transported to and happened under the screen.
When a Display terminal with an underscreen Fingerprint is prepared, FOD (Fingerprint On Display) holes need to be formed in films such as a composite tape layer, and due to the difference of the FOD holes and the composite tape layer structure in a non-perforated area, when the Display screen emits light, problems such as Mura (uneven color and uneven brightness) and obvious boundaries can occur, so that the Display terminal is poor in Display.
Disclosure of Invention
In view of this, embodiments of the present invention provide a display module, a method for manufacturing the same, and a display terminal, so as to solve the technical problem of poor display caused by Mura and an obvious boundary generated when an FOD hole is formed in the prior art.
According to an aspect of the present invention, an embodiment of the present invention provides a display module, including: the display screen comprises a fingerprint identification area and a non-fingerprint identification area; an adhesive support layer located on a side of the display screen facing away from display light emission, the adhesive support layer including a projection of the opening onto the display screen covered by the fingerprint identification area; and the transparent reflection compensation film layer is positioned in the opening and attached to the side, away from the display light emitting side, of the display screen, and the absolute value of the difference between the blue light waveband reflectivity at the interface of the transparent reflection compensation film layer and the display screen and the blue light waveband reflectivity at the non-opening area of the bonding support layer and the interface of the display screen is smaller than or equal to a preset value.
In one embodiment the preset value is 10% of the reflectance of the blue wavelength band at the interface of the non-open area of the adhesive support layer and the display screen.
In one embodiment, the thickness of the transparent reflection compensation film layer is smaller than the depth of the opening, the transparent reflection compensation film layer comprises a plurality of laminated transparent reflection compensation sub-film layers, and the refractive indexes of blue light bands of the plurality of transparent reflection compensation sub-film layers are different.
In a further embodiment, the transparent reflection compensation film layer has a thickness of 5 μm or less. In one embodiment, the thicknesses of the plurality of transparent reflection compensation sub-film layers are the same, and the refractive indexes of the blue light bands of the plurality of transparent reflection compensation sub-film layers are gradually increased within a preset range along the display light emitting direction of the display screen.
In one embodiment, the absolute value of the difference between the refractive indexes of the blue light band of two adjacent transparent reflection compensation sub-film layers is inversely proportional to the number of the transparent reflection compensation sub-film layers.
In one embodiment, the transparent reflection compensation sub-film layer is prepared by a deposition method or a magnetron sputtering method.
In one embodiment, the bonding support layer comprises: a composite tape layer sequentially stacked along a display light emitting direction, the composite tape layer including a first sub-opening; and a first pressure sensitive adhesive layer including a second sub-opening; wherein the first sub-opening and the second sub-opening constitute the opening.
According to another aspect of the present invention, a method for manufacturing a display module according to an embodiment of the present invention includes: providing a display screen, wherein the display screen comprises a fingerprint identification area and a non-fingerprint identification area; preparing a bonding support layer on the side, away from the display light, of the display screen, wherein the bonding support layer is provided with a through opening, and the projection of the opening on the display screen is covered by the fingerprint identification area; and preparing a transparent reflection compensation film layer in the opening and attached to the side, away from the display light, of the display screen, wherein the absolute value of the difference between the reflectivity of the blue light waveband at the interface of the transparent reflection compensation film layer and the display screen and the reflectivity of the blue light waveband at the non-opening area of the bonding support layer and the interface of the display screen is smaller than or equal to a preset value.
In one embodiment, the preparing a transparent reflection compensation film layer attached to the side of the display screen facing away from the display light emitting side in the opening includes: and a plurality of transparent reflection compensation sub-film layers are deposited or magnetron sputtered in a stacking manner on the side, away from the display light emitting side, of the display screen in the opening, wherein the refractive indexes of blue light wave bands of the plurality of transparent reflection compensation sub-film layers are different.
According to another aspect of the present invention, an embodiment of the present invention provides a display terminal, including: the display module as described in any of the above; and the fingerprint identification module is arranged in the opening in the display module and is positioned on the side, deviating from the display light-emitting side, of the transparent reflection compensation film layer.
According to the display module provided by the embodiment of the invention, the transparent reflection compensation film layer is arranged in the opening (namely, the FOD hole) of the bonding support layer and attached to the side, away from the display light, of the display screen, so that the absolute value of the difference value between the blue light waveband reflectivity at the interface of the transparent reflection compensation film layer and the display screen and the blue light waveband reflectivity at the non-opening area of the bonding support layer and the interface of the display screen is smaller than or equal to the preset value, the blue light waveband reflectivity of the difference in the preset range is realized in the fingerprint identification area and the non-fingerprint identification area, and the problems of Mura and an obvious boundary are effectively reduced. In addition, compared with the prior art that Mura is reduced by providing a voltage compensation value for the pixels in the fingerprint identification area through the compensation circuit, the preparation process for arranging the transparent reflection compensation film layer is simpler and saves more space.
Drawings
Fig. 1 is a schematic view of a display module provided in the prior art.
Fig. 2 is a top view of a schematic diagram of a display module according to an embodiment of the invention.
Fig. 3 is a front view of the display module shown in fig. 2.
Fig. 4 is a front view of a schematic diagram of a display module according to an embodiment of the invention.
Fig. 5 is a flowchart illustrating a method for manufacturing a display module according to an embodiment of the invention.
Fig. 6 is a flowchart illustrating a method for manufacturing a display module according to an embodiment of the invention.
Detailed Description
As described in the background art, the prior art has a technical problem of poor display caused by Mura and an obvious boundary when the FOD hole is opened during the fingerprint under the screen. The inventors have studied and found that the reason why such a problem occurs is as follows. Fig. 1 is a schematic view of a display module provided in the prior art. As shown in fig. 1, when a display module having an underscreen fingerprint is manufactured, it is necessary to form an FOD hole on the pressure-sensitive adhesive layer 2 and the composite adhesive tape layer 3 in the non-display light-emitting direction of the display screen 1. Within the FOD hole is Air, forming an Air Gap. Because the refractive index of Air Gap is different from the total refractive index of the pressure sensitive adhesive layer 2 and the composite adhesive tape layer 3, the reflectivity E1 at the interface of the FOD hole and the display screen 1 is different from the reflectivity E1' at the interface of the pressure sensitive adhesive layer 2 and the display screen 1, the reflectivity of the blue light waveband at the interface of the FOD hole and the display screen 1 is different from the reflectivity of the blue light waveband at the interface of the pressure sensitive adhesive layer 2 and the display screen 1, the reflectivity of the blue light waveband can influence the luminous flux of the blue light waveband entering the TFT and influence the electrical property of the TFT, and further the electrical property of the TFT region corresponding to the fingerprint identification region is different from that corresponding to the non-fingerprint region, so that the brightness of the pixels in the fingerprint identification region is different from that of the pixels in the non-fingerprint identification region, and the color. When the display screen emits light, problems such as Mura (uneven color and uneven brightness) and obvious boundaries occur, and the display of the display terminal is poor. In addition, in the prior art, Mura is reduced by providing a compensation circuit to provide voltage compensation values for the pixels in the fingerprint identification area, which is complex and requires additional space for additional circuit arrangement.
In order to solve the above problems, the inventor researches and discovers that by arranging a transparent reflection compensation film layer in an opening (i.e., a FOD hole) of a bonding support layer and attached to the side of a display screen, which is away from the display light emitting side, the absolute value of the difference between the blue light band reflectivity at the interface of the transparent reflection compensation film layer and the display screen and the blue light band reflectivity at the interface of a non-opening area of the bonding support layer and the interface of the display screen is smaller than or equal to a preset value, the blue light band reflectivity with the difference within a preset range is realized in a fingerprint identification area and a non-fingerprint identification area, and the Mura and obvious boundary problems. In addition, compared with the prior art that Mura is reduced by providing a voltage compensation value for the pixels in the fingerprint identification area through the compensation circuit, the preparation process for arranging the transparent reflection compensation film layer is simpler and saves more space.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 2 is a top view of a schematic diagram of a display module according to an embodiment of the invention. Fig. 3 is a front view of the display module shown in fig. 2. As shown in fig. 2 and 3, the display module includes: the display screen 1, the display screen 1 includes fingerprint identification area 11 and non-fingerprint identification area 12; it can be understood that the fingerprint identification area is a part of the display area, the display area refers to an area with a display function, the adhesive support layer 4 is located on the side, away from the display light, of the display screen 1, the adhesive support layer 4 includes a through opening 41, and the projection of the opening 41 on the display screen 1 is covered by the fingerprint identification area 11; and a transparent reflection compensation film layer 5 located in the opening 41 and attached to a side of the display screen 1 away from the display light emission side, wherein an absolute value of a difference between a blue light band reflectivity at an interface between the transparent reflection compensation film layer 5 and the display screen 1 and a blue light band reflectivity at an interface between the non-opening area 42 of the bonding support layer 4 and the display screen is less than or equal to a preset value.
Due to the sensitivity of the TFT itself to the blue light band, the reflectance of the blue light band at the interface between the transparent reflection compensation film 5 and the display screen 1 is different from the reflectance of the blue light band at the interface between the non-opening 41 region of the adhesive support layer 4 and the display screen 1, which affects the luminous flux of the blue light band entering the TFT corresponding to the fingerprint identification region 11 and the TFT corresponding to the non-fingerprint identification region 12. The luminous flux of a blue waveband in a certain area in the TFT is large, and the driving voltage value is large; the TFT has a small luminous flux in a blue wavelength band in a certain region and a small driving voltage value. The TFTs corresponding to the fingerprint identification area 11 and the TFTs in the non-fingerprint identification area 12 have different luminous fluxes in the blue wavelength band, and the fingerprint identification area 11 and the non-fingerprint identification area 12 have different luminance and color development uniformity.
In the embodiment of the invention, the transparent reflection compensation film layer 5 is arranged in the opening 41 (i.e., the FOD hole) of the bonding support layer 4 and attached to the side, away from the display light, of the display screen 1, so that the absolute value of the difference between the blue light waveband reflectivity at the interface between the transparent reflection compensation film layer 5 and the display screen 1 and the blue light waveband reflectivity at the interface between the non-opening 41 area of the bonding support layer 4 and the interface between the display screen 1 is smaller than or equal to a preset value, the blue light waveband reflectivity within a preset range is realized in the fingerprint identification area 11 and the non-fingerprint identification area 12, and the problems of Mura and obvious boundaries are effectively reduced. In addition, compared with the prior art that Mura is reduced by providing a compensation circuit to provide voltage compensation values for the pixels of the fingerprint identification area 11, the preparation process of the transparent reflection compensation film layer 5 is simpler and more space-saving.
It should be understood that the transparent reflection compensation film layer 5 is only required to be transparent, and an absolute value of a difference between a reflectivity of a blue light waveband at an interface between the transparent reflection compensation film layer 5 and the display screen 1 and a reflectivity of a blue light waveband at an interface between a non-opening 41 area of the bonding support layer 4 and the display screen 1 is less than or equal to a preset value, and the specific structure of the transparent reflection compensation film layer 5 is not limited in the embodiment of the invention.
It should be understood that the preset values may be 0%, 2%, 3%, 5%, 8%, and 10% of the reflectance of the blue band at the interface of the non-open area of the bonding support layer and the display screen. The preset value is only required to be less than 10% of the reflectivity of the blue light waveband at the interface between the non-opening area of the bonding support layer and the display screen, and the specific numerical value of the preset value is not limited in the embodiment of the invention.
It should be understood that the display screen 1 may be an OLED flexible screen or the like. The shape of the fingerprint identification area 11 may be circular, rectangular, square, etc. The Adhesive support layer 4 is a film layer for adhering the display panel 1 and supporting the display panel 1 when the display terminal is manufactured, and the Adhesive support layer 4 may be a multilayer structure including a composite Adhesive tape layer (SCF) and a PSA (pressure sensitive Adhesive) film layer, which are sequentially stacked. The openings 41 (i.e., FOD holes) of the adhesive support layer 4 conform to the shape of the fingerprint recognition area 11.
It should be understood that the display screen 1 includes the supporting layer 11, the second pressure sensitive adhesive layer 12, and the OLED panel layer 13 which are sequentially stacked along the display light emitting direction as in the conventional display screen 1, wherein the OLED panel layer 13 includes a substrate, a thin film transistor layer, an organic light emitting device layer, an encapsulation layer, a polarization layer, a touch layer, and a cover plate which are sequentially stacked. The area corresponding to the fingerprint identification area 11 in the display screen 1 formed by the multilayer structure needs to form a light transmission channel, which is light needed by the normal use of the fingerprint identification module located under the screen.
In one embodiment, the preset value is 10% of the reflectance of the blue wavelength band at the interface of the non-open area of the bonding support layer and the display screen.
In the embodiment of the invention, the transparent reflection compensation film layer is arranged in the opening (namely, the FOD hole) of the bonding support layer and attached to the side, away from the display light, of the display screen, so that the absolute value of the difference value between the blue light waveband reflectivity at the interface of the transparent reflection compensation film layer and the display screen and the blue light waveband reflectivity at the non-opening area of the bonding support layer and the interface of the display screen is less than or equal to 10% of the blue light waveband reflectivity at the interface of the display screen and the non-opening area of the bonding support layer, the blue light waveband reflectivity with the difference within the preset range is realized in the fingerprint identification area 11 and the non-fingerprint identification area 12, and the problems of Mura and. In a further embodiment, the preset value is zero. Through in the opening 41 (the FOD hole) of bonding supporting layer 4 and attached in the luminous one side of deviating from of display screen 1 and showing and set up transparent reflection compensation rete 5 for the blue light wave band reflectivity of transparent reflection compensation rete 5 and display screen 1's interface department is the same with the blue light wave band reflectivity of bonding supporting layer 4's non-open area and display screen 1's interface department, realize equal blue light wave band reflectivity in fingerprint identification region 11 and non-fingerprint identification region 12, effectively reduce Mura and obvious marginal problem.
In one embodiment, the thickness of the transparent reflective compensation film layer 5 is less than the depth of the opening 41, and the transparent reflective compensation film layer 5 includes: and the refractive indexes of blue light wave bands of the plurality of transparent reflection compensation sub-film layers are different.
In the embodiment of the invention, a plurality of transparent reflection compensation sub-film layers with different refractive indexes of blue light wave bands are stacked, the matching of the plurality of transparent reflection compensation sub-film layers with different refractive indexes of blue light wave bands makes the absolute value of the difference between the refractive indexes of the Air Gap and the blue light wave bands of the plurality of stacked transparent reflection compensation sub-film layers and the blue light wave bands of the non-opening 41 area of the bonding support layer 4 smaller than or equal to a preset value when the thickness of the transparent reflection compensation film layer 5 is smaller than the depth of the opening 41, the absolute value of the difference between the refractive indexes, the thicknesses and the refractive indexes of the blue light wave bands of the interface between the transparent reflection compensation film layer 5 and the display screen 1 and the blue light wave band of the interface between the non-opening 41 area of the bonding support layer 4 and the display screen 1 is smaller than or equal to the preset value through the conversion relation among the refractive indexes, the thicknesses and the refractive indexes, and the Reflectivity, effectively reducing Mura and the problem of sharp boundaries.
In a further embodiment, the transparent reflection compensation film layer 5 has a thickness of 5 μm or less. In the prior art, the thickness of the bonding support layer 4 is greater than 5 μm, and the thickness of the transparent reflection compensation film 5 is set to be 5 μm or less so that the transparent reflection compensation film 5 is positioned in the opening of the bonding support layer 4. 5 thickness overthicknesss of transparent reflection compensation rete, in order to guarantee the planarization of display module assembly, will compress the headspace of fingerprint identification module thickness under the fingerprint identification region 11, the preparation degree of difficulty that fingerprint identification module's volume undersize can increase fingerprint identification module. Therefore, the thickness of the transparent reflection compensation film layer 5 is less than or equal to 5 microns, Mura can be effectively reduced, the smoothness of the display module can be guaranteed, and the difficulty in manufacturing the fingerprint identification module can not be increased. In one embodiment, the thicknesses of the transparent reflection compensation sub-film layers are the same, and the refractive indexes of the blue light bands of the transparent reflection compensation sub-film layers are gradually increased within a preset range along the display light emitting direction of the display screen 1. The thicknesses of the plurality of transparent reflection compensation sub-film layers are made to be the same, and only the refractive index of each transparent reflection compensation sub-film layer in the plurality of transparent reflection compensation sub-film layers is required to be gradually increased within a preset range along the display light emitting direction, and finally when the thickness of the transparent reflection compensation film layer 5 is smaller than the depth of the opening 41, the absolute value of the difference between the refractive index of the blue light waveband of the plurality of stacked transparent reflection compensation sub-film layers and the refractive index of the blue light waveband of the non-opening 41 region of the bonding support layer 4 is smaller than or equal to a preset value, and the thickness of each transparent reflection compensation sub-film layer does not need to be considered. It is more simply achieved that the absolute value of the difference between the reflectance of the blue wavelength band at the interface of the transparent reflection compensation film layer 5 and the display screen 1 and the reflectance of the blue wavelength band at the interface of the non-opening 41 region of the adhesive support layer 4 and the display screen 1 is less than or equal to a preset value.
It should be understood that the gradual increase may or may not be in accordance with the step gradient. As long as the refractive index of the blue light band of the plurality of transparent reflection compensation sub-film layers gradually increases within a preset range along the display light emitting direction, the embodiment of the present invention does not limit the specific gradually increasing manner.
In a further embodiment, the predetermined range comprises the refractive index of air in the blue wavelength band to the refractive index of the blue wavelength band of the support layer of the display screen. Because one side of the transparent reflection compensation film layer 5 is Air and the other side is the supporting layer of the display screen 1, the refractive index of the blue light wave band of the plurality of transparent reflection compensation sub-film layers is gradually increased between the refractive index of the blue light wave band of the Air and the refractive index of the blue light wave band of the supporting layer along the display light emitting direction of the display screen 1, and the absolute value of the difference between the refractive index of the blue light wave band of the plurality of stacked transparent reflection compensation sub-film layers and the refractive index of the blue light wave band of the non-opening 41 area of the bonding supporting layer 4 is favorably smaller than or equal to a. In one embodiment, an absolute value of a difference in refractive indices of blue wavelength bands of adjacent two transparent reflection compensation sub-film layers is inversely proportional to the number of layers of the plurality of transparent reflection compensation sub-film layers. When the thickness of the transparent reflection compensation film layer is constant, the absolute value of the difference value of the refractive indexes of the blue light wave bands of the two adjacent transparent reflection compensation sub-film layers is inversely proportional to the number of the transparent reflection compensation sub-film layers. The more the number of the transparent reflection compensation sub-film layers is, the smaller the absolute value of the difference value of the refractive indexes of the blue light wave bands of the two transparent reflection compensation sub-film layers is; the smaller the number of layers of the plurality of transparent reflection compensation sub-film layers, the larger the absolute value of the difference in refractive index of the blue light band of the two transparent reflection compensation sub-film layers. With such an arrangement, it is beneficial to construct that the absolute value of the difference between the refractive index of the Air Gap and the blue light band of the stacked plurality of transparent reflection compensation sub-film layers and the refractive index of the blue light band of the non-opening 41 region of the bonding support layer 4 is less than or equal to a preset value.
In a preferred embodiment, the transparent reflection compensation film layer 5 is 5 μm, and the transparent reflection compensation film layer 5 includes 4 transparent reflection compensation sub-film layers, each having a thickness of 1.25 μm. The refractive index of the blue light wave band of the 4 transparent reflection compensation sub-film layers is gradually increased according to the interval gradient, and the value of the interval gradient is the value obtained by dividing the absolute value of the difference between the refractive index of the blue light wave band of the supporting layer and the refractive index of the blue light wave band of air by 4. Each transparent reflection compensation sub-film layer obtains the refractive index of the corresponding blue light waveband by magnetron sputtering different optional materials, or each transparent reflection compensation sub-film layer obtains the refractive index of the corresponding blue light waveband by depositing different optional materials.
In one embodiment, the material of the transparent reflection compensation sub-film layer includes polymethyl methacrylate or transparent silicone. Polymethyl methacrylate or transparent silicone is a common transparent material which can obtain a difference in the reflectivity of the blue light band within a preset range when the thickness is different from that of the bonding support layer 4. Polymethyl methacrylate or transparent silica gel is adopted as the material of the transparent reflection compensation sub-film layer, which is beneficial to batch production.
In one embodiment, the transparent reflection compensation sub-film layer is prepared by a deposition method or a magnetron sputtering method. A plurality of transparent reflection compensation sub-film layers with different blue light wave band refractive indexes are prepared by depositing or magnetron sputtering materials with different blue light wave band refractive indexes in a stacking mode to form a transparent reflection compensation film layer 5, so that the absolute value of the difference value between the blue light wave band reflectivity at the interface of the transparent reflection compensation film layer 5 and the display screen 1 and the blue light wave band reflectivity at the non-opening 41 area of the bonding supporting layer 4 and the interface of the display screen 1 is smaller than or equal to a preset value.
Fig. 4 is a front view of a schematic diagram of a display module according to an embodiment of the invention. As shown in fig. 4, the adhesive support layer 4 includes: the composite tape layers 3, 3 laminated in sequence along the display light emission direction include a first sub-opening 31; and a first pressure-sensitive adhesive layer 2, the first pressure-sensitive adhesive layer 2 including a second sub-opening 21; the first sub-opening 31 and the second sub-opening 21 form an opening 41.
The adhesive support layer 4 is composed of the composite adhesive tape layer 3 and the first pressure sensitive adhesive layer 2, and the first sub-opening 31 and the second sub-opening 21 are respectively formed on the composite adhesive tape layer 3 and the first pressure sensitive adhesive layer 2, so that the first sub-opening 31 and the second sub-opening 21 form an opening 41.
In a further embodiment, as shown in fig. 4, the display screen 1 includes a support layer 11, a second pressure sensitive adhesive layer 12, and an OLED panel layer 13, which are sequentially stacked along a display light emitting direction, of the conventional display screen 1, wherein the OLED panel layer 13 includes a substrate, an organic light emitting device layer, an encapsulation layer, a polarizing layer, a touch layer, a cover plate, and the like, which are sequentially stacked.
Fig. 5 is a flowchart illustrating a method for manufacturing a display module according to an embodiment of the invention. As shown in fig. 5, the preparation method includes the following steps:
step 501: providing a display screen, wherein the display screen comprises a fingerprint identification area and a non-fingerprint identification area;
step 502: preparing a bonding support layer on the side, away from the display luminescence, of the display screen, wherein the bonding support layer comprises a through opening, and the projection of the opening on the display screen is covered by a fingerprint identification area;
step 503: and preparing a transparent reflection compensation film layer attached to the side, away from the display light, of the display screen in the opening, wherein the absolute value of the difference between the reflectivity of the blue light wave band at the interface of the transparent reflection compensation film layer and the display screen and the reflectivity of the blue light wave band at the non-opening area of the bonding support layer and the interface of the display screen is less than or equal to a preset value.
In the embodiment of the invention, the transparent reflection compensation film layer is arranged in the opening of the bonding support layer and attached to the side, away from the display light emitting side, of the display screen, so that the absolute value of the difference value between the blue light waveband reflectivity at the interface of the transparent reflection compensation film layer and the display screen and the blue light waveband reflectivity at the non-opening area of the bonding support layer and the interface of the display screen is smaller than or equal to the preset value, the blue light waveband reflectivity within the preset range is differentiated in the fingerprint identification area and the non-fingerprint identification area, and the problems of Mura and obvious boundaries are effectively reduced. In addition, compared with the prior art that Mura is reduced by providing a voltage compensation value for the pixels in the fingerprint identification area through the compensation circuit, the preparation process for arranging the transparent reflection compensation film layer is simpler and saves more space.
Fig. 6 is a flowchart illustrating a method for manufacturing a display module according to an embodiment of the invention.
As shown in figure 6 of the drawings,
preparing a transparent reflection compensation film layer attached to the side of the display screen, which is away from the display light-emitting side, in the opening, includes:
step 5021: and a plurality of transparent reflection compensation sub-film layers are deposited or magnetron sputtered in a stacking manner on the side, away from the display light emitting side, of the display screen in the opening, wherein the refractive indexes of blue light wave bands of the plurality of transparent reflection compensation sub-film layers are different.
In the embodiment of the invention, a plurality of transparent reflection compensation sub-film layers with different blue light wave band refractive indexes are prepared by depositing or magnetron sputtering materials with different blue light wave band refractive indexes in a stacking way, the absolute value of the difference value between the AirGap and the blue light wave band refractive index of the stacked plurality of transparent reflection compensation sub-film layers and the blue light wave band refractive index of a non-opening area of a bonding supporting layer is less than or equal to a preset value when the thickness of the transparent reflection compensation film layer is less than the depth of an opening, and the absolute value of the difference value between the blue light wave band reflectivity of the interface between the transparent reflection compensation film layer and a display screen and the blue light wave band reflectivity of the interface between the bonding supporting layer and the display screen is less than or equal to the preset value through the conversion relation among the refractive indexes, the thicknesses and the reflectivities, equal blue light wave band reflectivity is realized in a fingerprint identification area and a non-fingerprint identification area, and the problems of Mura and obvious boundaries are effectively reduced.
In an embodiment, a display terminal includes any one of the display modules described above, and a fingerprint identification module disposed in the opening of the display module and located on a side of the transparent reflection compensation film layer facing away from the display light-emitting side.
In the embodiment of the invention, the fingerprint identification module is arranged on the side, deviating from the display light-emitting side, of the transparent reflection compensation film layer in the opening (namely the FOD hole) in the display module, and the transparent reflection compensation film layer is utilized to enable the fingerprint identification area and the non-fingerprint identification area to realize the blue light waveband reflectivity with the difference within the preset range, so that the problems of Mura and obvious boundaries are effectively reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and the like that are within the spirit and principle of the present invention are included in the present invention.
Claims (10)
1. A display module, comprising:
the display screen comprises a fingerprint identification area and a non-fingerprint identification area;
the bonding support layer is positioned on one side, away from the display light emitting side, of the display screen and comprises a through opening, and the projection of the through opening on the display screen is covered by the fingerprint identification area; and
the transparent reflection compensation film layer is positioned in the opening and attached to the side, away from the display light emitting side, of the display screen, and the absolute value of the difference between the reflectivity of the blue light wave band at the interface of the transparent reflection compensation film layer and the display screen and the reflectivity of the blue light wave band at the non-opening area of the bonding support layer and the interface of the display screen is smaller than or equal to a preset value.
2. The display module of claim 1, wherein the predetermined value is 10% of a reflectance of a blue wavelength band at an interface of the non-open area of the adhesive support layer and the display screen.
3. The display module of claim 1, wherein the thickness of the transparent reflective compensation film layer is smaller than the depth of the opening, the transparent reflective compensation film layer comprises a plurality of transparent reflective compensation sub-film layers stacked, and the refractive indices of the plurality of transparent reflective compensation sub-film layers in the blue wavelength band are different.
4. The display module according to claim 3, wherein the plurality of transparent reflection compensation sub-film layers have the same thickness, and the refractive index of the blue light band of the plurality of transparent reflection compensation sub-film layers gradually increases within a predetermined range along the display light emitting direction of the display screen.
5. The display module of claim 3, wherein the absolute value of the difference between the refractive indices of the blue light band of two adjacent transparent reflection compensation sub-film layers is inversely proportional to the number of the transparent reflection compensation sub-film layers.
6. The display module according to claim 3, wherein the transparent reflection compensation sub-film layer is prepared by a deposition method or a magnetron sputtering method.
7. The display module of claim 1, wherein the adhesive support layer comprises: laminated in sequence along the display emission direction
A composite tape layer comprising a first sub-opening; and
a first pressure-sensitive adhesive layer including a second sub-opening;
wherein the first sub-opening and the second sub-opening constitute the opening.
8. A preparation method of a display module is characterized by comprising the following steps:
providing a display screen, wherein the display screen comprises a fingerprint identification area and a non-fingerprint identification area;
preparing a bonding support layer on one side of the display screen, which is far away from the display luminescence, wherein the bonding support layer comprises a through opening, and the projection of the opening on the display screen is superposed with the fingerprint identification area; and
and preparing a transparent reflection compensation film layer on the side, away from the display light, of the display screen in the opening, wherein the absolute value of the difference between the reflectivity of the blue light waveband at the interface of the transparent reflection compensation film layer and the display screen and the reflectivity of the blue light waveband at the non-opening area of the bonding support layer and the interface of the display screen is less than or equal to a preset value.
9. The method of claim 8, wherein the step of forming a transparent reflective compensation film layer in the opening attached to the side of the display screen facing away from the display light emission comprises:
and a plurality of transparent reflection compensation sub-film layers are deposited or magnetron sputtered in a stacking manner on the side, away from the display light emitting side, of the display screen in the opening, wherein the refractive indexes of blue light wave bands of the plurality of transparent reflection compensation sub-film layers are different.
10. A display terminal, comprising:
the display module according to any one of claims 1 to 7; and
the fingerprint identification module is arranged in the opening in the display module and is positioned on the side, deviating from the display light-emitting side, of the transparent reflection compensation film layer.
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