A manufacturing method for a small-sized liquid crystal display screen

Abstract

The present invention relates to a manufacturing method of a small-sized liquid crystal display screen, comprising: a cell process and a module process; the cell process includes: cleaning an array substrate and a color filter substrate; coating a layer of alignment material on the array substrate and the color filter substrate respectively to form an alignment film layer respectively, and rubbing the surfaces of the alignment film layers along a specified direction with rollers wrapped with chemical fiber or pure cotton flannelette; coating a circle of sealant on a pre-corresponding display boundary area on the color filter substrate; in a vacuum environment, aligning the array substrate and the color filter substrate together to obtain a first cavity; in a vacuum environment, inserting a thin tube into the sealant, and injecting liquid crystal into the first cavity through the thin tube according to a first preset pressure; in a vacuum environment, sealing the sealant, and under ultraviolet light irradiation conditions and applying a second preset pressure respectively to the outside of the array substrate and the outside of the color filter substrate, the sealant is cured to form a liquid crystal cell.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal display, and particularly to a manufacturing method for a small-sized liquid crystal display screen. Background Art

[0002] A liquid crystal display screen uses two pieces of polarizing material, and between them is a liquid crystal solution. When an electric current passes through the liquid crystal, the liquid crystal will rearrange itself so that light cannot pass through. Therefore, the liquid crystal can both allow light to pass through and block light.

[0003] Small-sized liquid crystal display screens generally include 0.8 inches, 1.54 inches, 1.77 inches, 2.0 inches, 2.8 inches, etc. Where are they generally used? Small-sized liquid crystal display screens are generally used in smart wearables, small handheld devices, medical products, etc. Common products include smart watches, VR glasses, police law enforcement devices, home blood glucose meters, etc.

[0004] With the wide application of liquid crystal display screens and the diversification of functions, in the production process of liquid crystal display screens, since many steps in the manufacturing process of liquid crystal display screens need to be carried out in a vacuum environment. However, although the existing vacuum environment seems to be completely enclosed, there is actually still some air inside, and it is not an absolute vacuum environment. Then, in this non-absolute vacuum environment during the manufacturing process of liquid crystal display screens (in fact, in the actual production process, some air will be adsorbed on the inner walls of the array substrate and the color filter substrate), when injecting liquid crystal between the array substrate and the color filter substrate, bubbles will be generated, and the bubbles will affect the arrangement of the liquid crystal, thereby affecting the clarity of the picture when the liquid crystal display module displays an image. Summary of the Invention

[0005] (I) Technical Problems to be Solved

[0006] In view of the above-mentioned disadvantages and deficiencies of the prior art, the present invention provides a manufacturing method for a small-sized liquid crystal display screen, which solves the technical problem in the prior art that when injecting liquid crystal between the array substrate and the color filter substrate during the manufacturing process of the liquid crystal display screen, bubbles will be generated, and the bubbles will affect the arrangement of the liquid crystal.

[0007] (II) Technical Solutions

[0008] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0009] An embodiment of the present invention provides a manufacturing method for a small-sized liquid crystal display screen. After obtaining an array substrate through an array process and a color filter substrate through a color filter process, the method is characterized in that it further sequentially includes: a cell process and a module process; the cell process includes:

[0010] Clean the array substrate and the color filter substrate separately;

[0011] Apply an alignment material on the array substrate and the color filter substrate respectively, so as to form an alignment film layer on the array substrate and the color filter substrate respectively, and use a roller wrapped with chemical fiber or pure cotton flannel to rub the surface of the alignment film layer along a specified direction respectively;

[0012] Apply a sealant around the pre-corresponding display boundary area on the color filter substrate;

[0013] In a vacuum environment, align the array substrate and the color filter substrate together to obtain a first cavity composed of the color filter substrate, the array substrate and a circle of sealant;

[0014] In a vacuum environment, insert a thin tube into the sealant, and inject liquid crystal into the first cavity through the thin tube according to a first preset pressure, so that the liquid crystal diffuses to fill the display area sealed by the sealant in the first cavity;

[0015] In a vacuum environment, seal the sealant, and under the conditions of ultraviolet light irradiation and applying a second preset pressure on the outside of the array substrate and the outside of the color filter substrate respectively, the sealant cures to form a liquid crystal cell.

[0016] Preferably, before the step of "in a vacuum environment, seal the sealant, and under the conditions of ultraviolet light irradiation and applying a second preset pressure on the outside of the array substrate and the outside of the color filter substrate respectively, the sealant cures to form a liquid crystal cell", it further includes:

[0017] Set a first electrode on the outside of the array substrate and a second electrode on the outside of the color filter substrate;

[0018] Apply a preset voltage to the first electrode and the second electrode, so as to generate an electric field between the array substrate and the color filter substrate, thereby making the liquid crystal in the first cavity arranged as a whole;

[0019] Stand the first cavity upright so that the through hole on the sealant of the first cavity is located at the upper edge of the first cavity;

[0020] In a vacuum environment, apply a second preset pressure on the outside of the array substrate and the outside of the color filter substrate respectively.

[0021] Preferably,

[0022] The step of "in a vacuum environment, seal the sealant, and under the conditions of ultraviolet light irradiation and applying a second preset pressure on the outside of the array substrate and the outside of the color filter substrate respectively, the sealant cures to form a liquid crystal cell" specifically includes:

[0023] In a vacuum environment, after a preset time period following the application of a second preset pressure to the outer sides of the array substrate and the color filter substrate, the capillary tube of the sealant in the first cavity is pulled out and the through-hole formed after pulling out the capillary tube from the sealant is closed. Under ultraviolet light irradiation conditions and with the application of a second preset pressure to the outer sides of the array substrate and the color filter substrate respectively, the sealant cures to form a liquid crystal cell.

[0024] Preferably,

[0025] The ultraviolet light irradiation conditions are: irradiating with ultraviolet light having an irradiation intensity of 70 - 75 mW / cm 2 and a wavelength of 380 nm for 25 minutes.

[0026] Preferably,

[0027] The array substrate and the color filter substrate are cleaned respectively, which specifically includes in sequence:

[0028] Performing oxidative cleaning on the surfaces of the array substrate and the color filter substrate respectively using an extreme ultraviolet light device;

[0029] Performing agitation cleaning on the surfaces of the array substrate and the color filter substrate after oxidative cleaning respectively using an atmospheric pressure plasma cleaning device;

[0030] Performing dry ultrasonic cleaning on the surfaces of the array substrate and the color filter substrate after agitation cleaning using an ultrasonic dry cleaning device.

[0031] Preferably,

[0032] The alignment material includes polyimide;

[0033] The first preset pressure is: 2 / 3 of the adhesive force of the sealant at room temperature.

[0034] Preferably,

[0035] Among them, the preset voltage applied to the first electrode and the second electrode is a DC voltage between 2.8 V and 16 V.

[0036] Preferably,

[0037] The second preset pressure is: 50 Newtons.

[0038] Preferably,

[0039] The module process includes: attaching a polarizer to the liquid crystal cell so that the liquid crystal cell forms a liquid crystal display screen after attaching the polarizer.

[0040] Preferably,

[0041] The module process further includes: epitaxially connecting the leads of the first electrode and the leads of the second electrode in the liquid crystal screen to a preset peripheral circuit to form a circuit interface, and assembling the circuit interface and the backlight to form a module.

[0042] (III) Beneficial Effects

[0043] The beneficial effects of the present invention are as follows: In the method for manufacturing a small-sized liquid crystal display screen of the present invention, since a thin tube is inserted into the sealant in a vacuum environment, and liquid crystal is injected into the first cavity through the thin tube according to a first preset pressure, the liquid crystal diffuses to fill the display area enclosed by the sealant in the first cavity. Compared with the prior art, it can make the liquid crystal in the first cavity more fully diffuse to fill the first cavity and reduce the bubbles in the first cavity. In addition, in the method for manufacturing a small-sized liquid crystal display screen of the present invention, since the through-hole of the sealant is closed in a vacuum environment, and the sealant is cured under ultraviolet light irradiation conditions and by applying a second preset pressure on the outer sides of the array substrate and the color filter substrate respectively to form a liquid crystal cell. Compared with the prior art, since the sealant is not cured temporarily after being closed, under the second preset pressure, in fact, the liquid crystal in the first cavity is pressurized, so that the liquid crystal in the first cavity can further fully diffuse to fill the first cavity and reduce the bubbles in the first cavity. Description of the Drawings

[0044] Figure 1 It is a flowchart of the cell formation process in the method for manufacturing a small-sized liquid crystal display screen of the present invention;

[0045] Figure 2 It is a flowchart of the method for manufacturing a small-sized liquid crystal display screen in this embodiment;

[0046] Figure 3 It is a schematic cross-sectional view of the first cavity in this embodiment.

[0047]

Description of the Reference Numerals

[0048] 1: Array substrate;

[0049] 2: Alignment film layer;

[0050] 3: Liquid crystal;

[0051] 4: Color filter substrate. Detailed Embodiments

[0052] In order to better explain the present invention for easy understanding, the present invention will be described in detail below with reference to the drawings through specific embodiments.

[0053] To better understand the above technical solutions, the exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0054] Embodiment 1

[0055] This embodiment provides a method for manufacturing a small-sized liquid crystal display screen. Referring to Figure 2 , after obtaining the array substrate 1 through the array process and the color filter substrate 4 through the color filter process, the method further sequentially includes: a cell process and a module process; referring to Figure 1 , the cell process includes:

[0056] Clean the array substrate 1 and the color filter substrate 4 respectively.

[0057] Apply a layer of alignment material on the array substrate 1 and the color filter substrate 4 respectively, so that an alignment film layer 2 is formed on the array substrate 1 and the color filter substrate 4 respectively, and a roller wrapped with chemical fiber or pure cotton flannel is used to rub the surface of the alignment film layer along a specified direction respectively.

[0058] In this embodiment, the alignment material includes polyimide.

[0059] Apply a circle of sealant on the pre-corresponding display boundary area on the color filter substrate 4.

[0060] Specifically, in this embodiment, the inner side of the circle of sealant applied on the color filter substrate 4 exactly corresponds to the pre-corresponding display boundary, or the distance between the inner side of the circle of sealant applied on the color filter substrate 4 and the pre-corresponding display boundary is exactly 2 mm.

[0061] Referring to Figure 3 , in a vacuum environment, the array substrate 1 and the color filter substrate 4 are aligned together to obtain a first cavity composed of the color filter substrate 4, the array substrate 1, and a circle of sealant.

[0062] In a vacuum environment, insert a thin tube into the sealant, and inject liquid crystal 3 into the first cavity through the thin tube according to a first preset pressure, so that the liquid crystal 3 diffuses and fills the display area enclosed by the sealant in the first cavity.

[0063] In this embodiment, the diameter of the thin tube is smaller than the distance between the array substrate 1 and the color filter substrate 4 in the first cavity. The length of the thin tube in this embodiment is 2 cm.

[0064] In a vacuum environment, seal the sealant. Under the conditions of ultraviolet light irradiation and applying a second preset pressure respectively from the outside of the array substrate 1 and the outside of the color filter substrate 4, the sealant cures to form a liquid crystal cell.

[0065] Since a second preset pressure is applied respectively from the outside of the array substrate 1 and the outside of the color filter substrate 4, the liquid crystal alignment in the first cavity becomes more compact and full. In addition, due to the application of the second preset pressure from the outside of the array substrate 1 and the outside of the color filter substrate 4, the sealant between the first cavities may be deformed. The distance between the inner side of the sealant coated on the color filter substrate 4 and the pre-corresponding display boundary is exactly 2 mm, and the 2 mm is exactly covered after deformation, and the sealant exactly surrounds the pre-corresponding display boundary.

[0066] Embodiment 2

[0067] This embodiment provides a manufacturing method for a small-sized liquid crystal display screen. After obtaining an array substrate through an array process and a color filter substrate through a color filter process, the method further sequentially includes: a cell process and a module process; the cell process includes:

[0068] Clean the array substrate and the color filter substrate respectively, specifically including in sequence:

[0069] Use an extreme ultraviolet light device to perform oxidation cleaning on the surfaces of the array substrate and the color filter substrate respectively.

[0070] Use an atmospheric pressure plasma cleaning device to perform agitation cleaning on the surfaces of the array substrate and the color filter substrate after oxidation cleaning.

[0071] Use an ultrasonic dry cleaning device to perform ultrasonic vibration dry cleaning on the surfaces of the array substrate and the color filter substrate after agitation cleaning.

[0072] Apply an alignment material on the array substrate and the color filter substrate respectively to form an alignment film layer on the array substrate and the color filter substrate respectively, and use a roller wrapped with chemical fiber or pure cotton flannel to rub the surfaces of the alignment film layers along a specified direction respectively.

[0073] The alignment material includes polyimide.

[0074] Apply a circle of sealant on the pre-corresponding display boundary area on the color filter substrate.

[0075] In a vacuum environment, align the array substrate and the color filter substrate together to obtain a first cavity composed of the color filter substrate, the array substrate, and a circle of sealant.

[0076] In a vacuum environment, a capillary tube is inserted into the sealant, and liquid crystal is injected into the first cavity through the capillary tube at a first preset pressure, so that the liquid crystal diffuses and fills the display area enclosed by the sealant in the first cavity.

[0077] The first preset pressure is: 2 / 3 of the bonding force of the sealant at room temperature.

[0078] A first electrode is provided outside the array substrate, and a second electrode is provided outside the color filter substrate.

[0079] In this embodiment, a transparent conductive thin film is deposited on the outside of the array substrate and the outside of the color filter substrate, serving as the first electrode and the second electrode respectively.

[0080] A preset voltage is applied to the first electrode and the second electrode, so that an electric field is generated between the array substrate and the color filter substrate, thereby causing the liquid crystal in the first cavity to be arranged as a whole.

[0081] Among them, the preset voltage applied to the first electrode and the second electrode is a DC voltage between 2.8V and 16V.

[0082] The first cavity is erected so that the through hole in the sealant of the first cavity is located at the upper edge of the first cavity.

[0083] In a vacuum environment, a second preset pressure is applied to the outside of the array substrate and the outside of the color filter substrate respectively.

[0084] In a vacuum environment, the sealant is sealed. Under the condition of ultraviolet light irradiation and while applying a second preset pressure to the outside of the array substrate and the outside of the color filter substrate respectively, the sealant is cured to form a liquid crystal cell.

[0085] The second preset pressure is: 50 Newtons.

[0086] The step of, in a vacuum environment, sealing the sealant and curing the sealant to form a liquid crystal cell under the condition of ultraviolet light irradiation and while applying a second preset pressure to the outside of the array substrate and the outside of the color filter substrate respectively specifically includes:

[0087] In a vacuum environment, after a preset time period of applying a second preset pressure to the outside of the array substrate and the outside of the color filter substrate respectively, the capillary tube of the sealant of the first cavity is pulled out and the through hole formed after pulling out the capillary tube from the sealant is sealed. Under the condition of ultraviolet light irradiation and while applying a second preset pressure to the outside of the array substrate and the outside of the color filter substrate respectively, the sealant is cured to form a liquid crystal cell.

[0088] The ultraviolet light irradiation condition is: using an irradiation intensity of 70 - 75mW / cm 2And irradiate with ultraviolet light having a wavelength of 380 nm for 15 - 30 minutes. In this embodiment, irradiate with ultraviolet light having an irradiation intensity of 75 mW / cm2 and a wavelength of 380 nm for 25 minutes.

[0089] The module process includes: attaching a polarizer to the liquid crystal cell, so that the liquid crystal cell forms a liquid crystal display screen after attaching the polarizer.

[0090] The module process further includes: epitaxially connecting the leads of the first electrode and the leads of the second electrode in the liquid crystal display screen to a preset peripheral circuit to form a circuit interface, and assembling the circuit interface and a backlight source to form a module.

[0091] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can be implemented in the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can be implemented in the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0092] The present invention is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, and the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions.

[0093] It should be noted that in the claims, any reference numerals placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" placed before a component does not exclude the presence of a plurality of such components. The present invention can be implemented by means of hardware including several different components and by means of a suitably programmed computer. In the claims listing several devices, several of these devices can be embodied by the same hardware. The use of the words first, second, third, etc. is only for convenience of expression and does not indicate any order. These words can be understood as part of the component names.

[0094] In addition, it should be noted that in the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0095] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications after learning the basic creative concepts. Therefore, the claims should be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0096] Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention should also include these modifications and variations.

Claims

1. A manufacturing method of a small-sized liquid crystal display screen. After obtaining an array substrate through an array process and a color filter substrate through a color filter process, the method is characterized in that, It also successively includes: a cell formation process and a module process; the cell formation process includes: Cleaning the array substrate and the color filter substrate respectively; Coating a layer of alignment material on the array substrate and the color filter substrate respectively, so as to form an alignment film layer on the array substrate and the color filter substrate respectively, and using a roller wrapped with chemical fiber or pure cotton flannel to rub the surface of the alignment film layer along a specified direction respectively; Coating a circle of sealant on the pre-corresponding display boundary area on the color filter substrate; Wherein, the inner side of the circle of sealant coated on the color filter substrate exactly corresponds to the pre-corresponding display boundary, or the distance between the inner side of the circle of sealant coated on the color filter substrate and the pre-corresponding display boundary is exactly 2 mm; In a vacuum environment, the array substrate and the color filter substrate are aligned together to obtain a first cavity composed of the color filter substrate, the array substrate and a circle of sealant; In a vacuum environment, a thin tube is inserted into the sealant, and liquid crystal is injected into the first cavity through the thin tube according to a first preset pressure, so that the liquid crystal diffuses and fills the display area sealed by the sealant in the first cavity; In a vacuum environment, the sealant is sealed, and under the condition of ultraviolet light irradiation and applying a second preset pressure respectively to the outside of the array substrate and the outside of the color filter substrate, the sealant is cured to form a liquid crystal cell; Before the step of "in a vacuum environment, the sealant is sealed, and under the condition of ultraviolet light irradiation and applying a second preset pressure respectively to the outside of the array substrate and the outside of the color filter substrate, the sealant is cured to form a liquid crystal cell", it also includes: Setting a first electrode on the outside of the array substrate and a second electrode on the outside of the color filter substrate; Applying a preset voltage to the first electrode and the second electrode, so as to generate an electric field between the array substrate and the color filter substrate, thereby enabling the liquid crystal in the first cavity to be arranged as a whole; Standing the first cavity upright so that the through hole on the sealant of the first cavity is located at the upper edge of the first cavity; In a vacuum environment, applying a second preset pressure respectively to the outside of the array substrate and the outside of the color filter substrate.

2. The manufacturing method according to claim 1, wherein The step of "in a vacuum environment, the sealant is sealed, and under the condition of ultraviolet light irradiation and applying a second preset pressure respectively to the outside of the array substrate and the outside of the color filter substrate, the sealant is cured to form a liquid crystal cell" specifically includes: In a vacuum environment, after a preset time period of applying a second preset pressure respectively to the outside of the array substrate and the outside of the color filter substrate, pulling out the thin tube of the sealant of the first cavity and closing the through hole formed after pulling out the thin tube from the sealant, and under the condition of ultraviolet light irradiation and applying a second preset pressure respectively to the outside of the array substrate and the outside of the color filter substrate, the sealant is cured to form a liquid crystal cell.

3. The manufacturing method according to claim 2, wherein The ultraviolet light irradiation condition is: irradiating with ultraviolet light having an irradiation intensity of 70 - 75 mW / cm2 and a wavelength of 380 nm for 25 minutes.

4. The manufacturing method according to claim 3, wherein Cleaning the array substrate and the color filter substrate respectively specifically successively includes: The surface of the array substrate and the color filter substrate are respectively subjected to oxidation cleaning by an extreme ultraviolet light device; The surfaces of the array substrate and the color filter substrate after oxidation cleaning are respectively subjected to agitation cleaning by an atmospheric pressure plasma cleaning device; The surfaces of the array substrate and the color filter substrate after agitation cleaning are subjected to dry cleaning with ultrasonic oscillation by an ultrasonic dry cleaning device.

5. The manufacturing method according to claim 4, characterized in that, The alignment material includes polyimide; The first preset pressure is: 2 / 3 of the bonding force of the sealant at room temperature.

6. The manufacturing method according to claim 5, characterized in that, Among them, The preset voltage applied to the first electrode and the second electrode is a DC voltage between 2.8V and 16V.

7. The manufacturing method according to claim 6, characterized in that, The second preset pressure is: 50 Newtons.

8. The manufacturing method according to claim 7, characterized in that, The module process includes: attaching a polarizer to the liquid crystal cell, so that the liquid crystal cell forms a liquid crystal display screen after attaching the polarizer.

9. The manufacturing method according to claim 8, characterized in that, The module process further includes: extending and connecting the leads of the liquid crystal display screen to the first electrode and the leads to the second electrode to a preset peripheral circuit to form a circuit interface, and assembling the circuit interface and a backlight source to form a module.

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