Display panel manufacturing method and display panel

Abstract

The invention relates to the technical field of display screens, and particularly discloses a display panel manufacturing method and a display panel, and the display panel manufacturing method comprises the steps of array, evaporation and thin film packaging on a substrate; the polaroid is attached to the substrate; planning a cutting track on the polaroid; carrying out surface modification treatment on the polaroid by the laser beam along the cutting track; and synchronously cutting the substrate and the polaroid along the cutting track. According to the method, the polaroid located near the cutting track is modified through the laser beam, so that the polaroid is subjected to phase change in the area near the cutting track to become a modified material, the modified material enables the hardness of the phase change area to be higher, and deformation of the phase change area is well improved under the influence of temperature and water vapor; according to the method, the stress on the attached film layer (such as TP and TFE functional layers) materials is reduced, so that the display panel manufactured by the method effectively improves the film layer damage, and the reject ratio of the display panel is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of display screens, and in particular to a display panel manufacturing method and a display panel. Background Art

[0002] The display screen is composed of a backlight, a liquid crystal layer, a polarizer, a glass cover, etc. Among them, the polarizer is an indispensable part. In the display screen, the polarizer mainly plays the role of adjusting the direction of light, so that the light can be transmitted in a specific direction, thereby achieving the display effect of the display screen. The polarizer can convert chaotic light into polarized light and guide it to the liquid crystal layer, making the transmission of light more orderly and stable, thereby achieving the purpose of a wider viewing angle range.

[0003] On the display panel, the polarizer material is prone to deformation (warping), which generates stress on the film layer (such as TP and TFE functional layers) to which it is attached, causing damage to the film layer and producing adverse effects.

[0004] Therefore, a display panel manufacturing method is urgently needed to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a display panel manufacturing method and a display panel to solve the problem in the related art that the polarizer material is prone to deformation (warping), which generates stress on the film layer (such as TP and TFE functional layer) material to which it is attached, causing damage to the film layer.

[0006] In one aspect, the present invention provides a method for manufacturing a display panel, the method comprising:

[0007] Perform array, evaporation and thin film packaging on substrates;

[0008] attaching a polarizer to the substrate;

[0009] Planning a cutting trajectory on the polarizer;

[0010] Allowing the laser beam to perform surface modification treatment on the polarizer along the cutting track;

[0011] The substrate and the polarizer are cut synchronously along the cutting track.

[0012] As a preferred technical solution of the display panel manufacturing method, a low-power laser beam emitted by an infrared laser is used to perform surface modification treatment on the polarizer along the cutting track.

[0013] As a preferred technical solution of the display panel manufacturing method, a laser beam is used to synchronously cut the substrate and the polarizer along the cutting track.

[0014] As a preferred technical solution of the display panel manufacturing method, a high-power laser beam emitted by a carbon dioxide laser is used to synchronously cut the substrate and the polarizer along the cutting track.

[0015] As a preferred technical solution of the display panel manufacturing method, the polarizer is located between the cutting track and the display area of ​​the substrate to form a polarization ring;

[0016] Around the circumference of the polarizing ring, a plurality of ribs are arranged at intervals on the polarizing ring, and the ribs extend along the width direction of the polarizing ring;

[0017] The laser beam performs surface modification treatment on the polarizing ring along the rib line.

[0018] On the other hand, the present invention provides a display panel, which is manufactured by the display panel manufacturing method in any of the above schemes, and the display panel includes the polarizer, and at least a part of the polarizer includes a modified material.

[0019] As a preferred technical solution for the display panel, the edge of the polarizer includes the modified material.

[0020] As a preferred technical solution for the display panel, the modified material includes heat-treated polyvinyl alcohol.

[0021] As a preferred technical solution for the display panel, the polarizer is attached to the substrate, and the distance between the modified material and the display area of ​​the substrate is a preset value a.

[0022] As a preferred technical solution for the display panel, the value of a is 100um-500um.

[0023] The beneficial effects of the present invention are:

[0024] The present invention provides a display panel manufacturing method and a display panel, the display panel manufacturing method includes arraying, evaporation and thin film packaging on a substrate; attaching a polarizer to the substrate; planning a cutting track on the polarizer; allowing a laser beam to perform surface modification on the polarizer along the cutting track; and synchronously cutting the substrate and the polarizer along the cutting track. In this method, the polarizer located near the cutting track is modified by a laser beam, so that the area of ​​the polarizer located near the cutting track undergoes a phase change to become a modified material, and the modified material makes the phase change area not only harder, but also under the influence of temperature and water vapor, the deformation of the phase change area is also well suppressed, reducing the stress of the film layer (such as TP and TFE functional layer) material attached to it, effectively avoiding damage to the film layer, and improving the yield of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1is a flow chart of a method for manufacturing a display panel according to an embodiment of the present invention;

[0026] Figure 2 is a cross-sectional view of a display panel in an embodiment of the present invention;

[0027] Figure 3 FIG. 4 is a top view of a display panel in an embodiment of the present invention.

[0028] In the figure:

[0029] 1. Substrate; 11. Display area; 2. Polarizer; 21. Cutting track; 22. Polarizing ring; 23. Rib line. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] Currently, display panels are commonly used in electronic devices such as mobile phones, tablets, smart wearable devices, and large-screen display devices. Display panels include multiple layers of films with different functions that are attached in sequence. These films are relatively fragile and can easily be damaged by external forces.

[0035] Among them, the warping of the edge of the polarizer is an important cause of film damage. In the process of display panel manufacturing, the following steps are usually included, namely TFT array, CELL box and back-end assembly. Among them, the attachment of the polarizer occurs in the back-end assembly. After the back-end assembly is completed, the polarizer and substrate are uniformly cut to form display panels of different sizes. During the cutting process, since the edge of the polarizer material is prone to deformation (warping), stress is generated on the film layer (such as TP and TFE functional layer) material to which it is attached, thereby causing damage to the film layer.

[0036] The reasons why the edge of the polarizer is prone to deformation during the production of display panels can usually be attributed to the following two situations: 1. External force: The polarizer may be affected by external forces during installation, such as accidental collision, bending, tearing, etc. These external forces may cause the edge of the polarizer to deform. 2. Environmental factors: When the polarizer is under extreme temperature or humidity conditions, the performance of the adhesive may be affected, resulting in edge deformation.

[0037] In order to solve the film damage caused by the above reasons, Figure 1 to Figure 3 As shown, this embodiment provides a display panel manufacturing method, the display panel manufacturing method comprising:

[0038] S10: performing arraying, evaporation and thin film packaging on the substrate 1.

[0039] In this step, the array is a process of manufacturing a TFT array on a substrate 1, including substrate cleaning, coating, exposure, development, etching and stripping, to superimpose film layers of different patterns and different materials to form an LTPS (low temperature polysilicon) drive circuit to provide a lighting signal and a stable power input for the light-emitting device. Specifically, the etching process is to etch away the film under the pattern on the substrate 1 that is not covered by the photoresist, leaving a film layer with the desired pattern. Development is to use a reducing agent to reveal the latent image formed by exposure on the substrate 1. Stripping is that the panel that has been etched already has an array pattern, and the stripping equipment strips off the remaining photoresist.

[0040] Evaporation is to evaporate organic light-emitting materials and cathode materials on the substrate 1 through a high-precision metal mask (FMM). Specifically, the evaporation equipment is composed of multiple chambers, completing a whole set of processes from substrate cleaning, light-emitting layer injection and packaging.

[0041] Thin film encapsulation is used to encapsulate multiple film layers on the substrate 1.

[0042] Since the inner structure of the substrate 1 is extremely sensitive to water, oxygen and dust, multiple film layers need to be packaged. This step uses a thin film packaging process, and in other embodiments, glass packaging or metal packaging can also be used.

[0043] S20: attaching the polarizer 2 to the substrate 1 .

[0044] In this step, the polarizer 2 can significantly improve the brightness of the display area 11; it can be viewed from multiple viewing angles without the image quality becoming dim; it also has the effect of improving the contrast, so the polarizer 2 needs to be attached to the substrate 1 after the array, evaporation and thin film packaging are completed.

[0045] S30: planning a cutting track 21 on the polarizer 2.

[0046] The cutting track 21 in this step is prepared for the subsequent modification of the polarizer 2 and the cutting of the polarizer 2 and the substrate 1, and indicates the moving path of the laser beam to prevent the staff from damaging the display area 11 of the substrate 1. Specifically, the cutting track 21 can be a track line drawn on the polarizer 2, or a track projection projected on the polarizer 2.

[0047] S40 : allowing the laser beam to perform surface modification treatment on the polarizer 2 along the cutting track 21 .

[0048] In this step, the purpose of the above-mentioned setting is to modify the area of ​​the polarizer 2 located near the cutting track 21 so that a phase change occurs in the area, thereby reducing the deformation effect of the area caused by temperature and humidity, improving the hardness of the area, reducing the stress on the film layer (such as TP and TFE functional layers) material to which it is attached, and avoiding damage to the film layer.

[0049] The specific steps for modifying the polarizer 2 are as follows: the laser beam is emitted by an infrared laser, and the laser beam is a low-power laser beam. In this step, the infrared laser generates an infrared laser with a wavelength greater than 700nm, which can penetrate transparent materials and realize processing inside the material. Therefore, when the POV material of the polarizer 2 is irradiated and modified by an infrared laser, the material structure in this area will undergo a phase change to harden the area, and then when the area is affected by temperature and humidity again, the deformation of the area can be reduced. Among them, the laser beam is a low-power laser beam to prevent the temperature rise of the laser beam in this area from being too high, thereby avoiding damage to the polarizer 2 in this area.

[0050] like Figure 3 As shown, optionally, the modification treatment of the polarizer 2 also includes: forming a polarizing ring 22 in the area of ​​the polarizer 2 between the cutting track 21 and the display area 11 of the substrate 1; and a plurality of ribs 23 are arranged on the polarizing ring 22 at intervals around the circumference of the polarizing ring 22, and the ribs 23 extend along the width direction of the polarizing ring 22.

[0051] The laser beam performs surface modification on the polarizing ring 22 along the ribs 23. The laser beam performs surface modification on the polarizing ring 22 along the ribs 23, thereby causing a phase change in the area near the ribs 23 to harden the area, thereby preventing the polarizing ring 22 from warping from the edge area to the center area, reducing the stress on the film layer (such as TP and TFE functional layers) on the polarizing ring 22, and avoiding damage to the film layer.

[0052] S50 : cutting the substrate 1 and the polarizer 2 synchronously along the cutting track 21 .

[0053] This step is to cut the substrate 1 into a display panel along the cutting track 21. The edge area of ​​the polarizer 2 on the display panel is modified, so the impact on the mold attached to the polarizer 2 can be reduced. Specifically, it includes: using a laser beam to synchronously cut the substrate 1 and the polarizer 2 along the cutting track 21. The laser beam is emitted by a carbon dioxide laser and is a high-power laser beam.

[0054] In this step, the substrate 1 and the polarizer 2 are cut synchronously along the cutting track 21 by using a laser beam. Since the cutting track 21 area on the polarizer 2 has been modified before, the heat generated by this process can cause the polarizer ring 22 to undergo controllable deformation (without affecting the attached film layer), thereby avoiding uncontrollable deformation of the polarizer ring 22 area after the display panel is manufactured, thereby generating greater stress on the film layer (such as TP and TFE functional layers) on the polarizer ring 22 to avoid damage to the film layer. The carbon dioxide laser can generate a laser with a wavelength of 10.6 microns, which can accurately cut the polarizer 2.

[0055] This embodiment also provides a display panel, which is manufactured by the display panel manufacturing method in the above scheme, and includes a polarizer, at least a part of which includes a modified material.

[0056] In this embodiment, after the polarizer 2 is attached to the substrate 1, a cutting track 21 of a corresponding size is drawn on the polarizer 2 according to the size of the required display panel. Subsequently, a modified laser beam emitted by an infrared laser acts on the cutting track 21 on the polarizer 2, thereby forming a modified material near the cutting track 21 of the polarizer 2, and then a high-power laser beam is used to synchronously cut the substrate 1 and the polarizer 2 along the cutting track 21 to form a display panel. Since the modified material is not only harder, but also has a well-improved deformation in the phase change region under the influence of temperature and water vapor, the stress of the film layer (such as TP and TFE functional layer) material attached thereto is reduced, effectively avoiding damage to the film layer and improving the yield rate of the display panel.

[0057] Optionally, the edge of the polarizer 2 includes a modified material. In this embodiment, the basic structure of the polarizer 2 includes the middle PVA (polyvinyl alcohol), two layers of TAC (triacetyl cellulose), PSA film (pressure-sensitive adhesive), Release film (release film) and Protective film (protective film). Among them, the PVA layer plays a polarizing role, but the PVA material is very susceptible to the influence of temperature, water and external force, and then deforms. In order to protect the physical properties of the polarizer 2, a layer of (TAC) film with high light transmittance, good water resistance and certain mechanical strength is compounded on both sides of the PVA for protection, which forms the original plate of the polarizer 2. The PVA layer is still exposed at the edge of the polarizer 2. Therefore, when the polarizer 2 is deformed under the influence of temperature and water vapor, the edge of the polarizer 2 is deformed first, and then the internal area of ​​the polarizer 2 is deformed. Therefore, the modified material is set in the edge area of ​​the polarizer 2, and this setting can well suppress the deformation of the polarizer 2 in the edge area.

[0058] Specifically, a continuous circle of modified material is formed at the circumferential edge of the polarizer 2 of the display panel. The modified material in this arrangement is arranged in a ring structure, thereby effectively suppressing the warping of the polarizer 2. In other embodiments, the modified material may also be arranged in multiple sections, and the multiple sections of modified material are arranged at intervals along the circumferential edge of the polarizer 2.

[0059] Optionally, the modified material includes heat-treated polyvinyl alcohol. Since the main reason for the deformation of the polarizer 2 is that the PVA (polyvinyl alcohol) in the middle is deformed under the influence of temperature, water vapor and external force. Therefore, the modification of the polarizer 2 is mainly the treatment of the polyvinyl alcohol. Therefore, in this embodiment, the polyvinyl alcohol layer of the polarizer 2 is heat-treated by a laser beam to obtain a modified material.

[0060] like Figure 3 As shown, optionally, the polarizer 2 is attached to the substrate 1, and the distance between the modified material and the display area 11 of the substrate 1 is a preset value a. In this embodiment, when the polarizer 2 is modified and subsequently cut by the laser beam, the heat radiation generated by the laser beam will diffuse to the surroundings of the polarizer 2. In order to avoid affecting the display area 11 of the substrate 1, the modified material needs to be spaced apart from the display area 11 of the substrate 1. Therefore, the distance between the modified material and the display area 11 of the substrate 1 needs to be a preset value a.

[0061] Specifically, the value of a is 100um-500um. In this embodiment, the value of a is proportional to the radius of thermal radiation generated by the laser beam on the polarizer 2. Specifically, the value of a can be one of 100um, 200um, 300um, 400um, 500um, or other values, as long as 100um≤a≤500um is ensured.

[0062] Optionally, the display panel can be applied to smart wearable devices, computers, televisions, etc.

[0063] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A method for manufacturing a display panel, characterized in that: include: Performing arraying, vapor deposition and thin film packaging on a substrate (1); Attaching a polarizing film (2) to the substrate (1); Planning a cutting track (21) on the polarizer (2); Using a laser beam to perform surface modification treatment on the polarizer (2) along the cutting track (21); The substrate (1) and the polarizer (2) are cut synchronously along the cutting track (21).

2. The method for manufacturing a display panel according to claim 1, characterized in that: A low-power laser beam emitted by an infrared laser is used to perform surface modification treatment on the polarizer (2) along the cutting track (21).

3. The method for manufacturing a display panel according to claim 1, wherein: The substrate (1) and the polarizer (2) are cut synchronously along the cutting track (21) using a laser beam.

4. The method for manufacturing a display panel according to claim 3, characterized in that: The substrate (1) and the polarizer (2) are cut synchronously along the cutting track (21) using a high-power laser beam emitted by a carbon dioxide laser.

5. The method for manufacturing a display panel according to any one of claims 1 to 4, characterized in that: The polarizer (2) is located in an area between the cutting track (21) and the display area (11) of the substrate (1) to form a polarization ring (22); Around the circumference of the polarizing ring (22), a plurality of ribs (23) are arranged at intervals on the polarizing ring (22), and the ribs (23) extend along the width direction of the polarizing ring (22); The laser beam performs surface modification treatment on the polarizing ring (22) along the rib line (23).

6. A display panel, characterized in that The display panel is manufactured by the display panel manufacturing method according to any one of claims 1 to 5, wherein the display panel comprises the polarizer (2), and at least a part of the polarizer (2) comprises a modified material.

7. The display panel according to claim 6, characterized in that: The edge of the polarizer (2) comprises the modified material.

8. The display panel according to claim 6, characterized in that: The modified material includes heat-treated polyvinyl alcohol.

9. The display panel according to claim 6, characterized in that: The polarizer (2) is attached to the substrate (1), and the distance between the modified material and the display area (11) of the substrate (1) is a preset value a.

10. The display panel according to claim 9, characterized in that: The value of a is 100um-500um.

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