A flexible and foldable LCD display screen and manufacturing method thereof

Abstract

The present application discloses a flexible and foldable LCD display screen and a manufacturing method thereof, which comprises a bendable transparent layer, a liquid crystal electrode portion, a driving layer, a foldable rigid bearing layer, a filter, an upper polarizer, a lower polarizer and a backlight diffusion film, wherein the liquid crystal electrode portion comprises a liquid crystal portion, an upper electrode layer and a lower electrode layer, the bottom side of the upper electrode layer is arranged on the top side of the liquid crystal portion, the top side of the lower electrode layer is arranged on the bottom side of the liquid crystal portion, the bottom side of the filter is arranged on the top side of the upper electrode layer, the bottom side of the bendable transparent layer is arranged on the top side of the filter, the top side of the bendable transparent layer is attached to an upper polarizer, the driving layer is arranged between the bottom side of the lower electrode layer and the top side of the foldable rigid bearing layer, the top side of the lower polarizer is arranged on the bottom side of the foldable rigid bearing layer, and the backlight diffusion film is arranged on the bottom side of the lower polarizer.

Description

Technical Field

[0001] The present invention relates to an LCD (liquid crystal display), and in particular to a flexible and foldable LCD display screen and a manufacturing method thereof. Background Art

[0002] The LCD display screen is a liquid crystal box placed between two parallel glass substrates, with TFT (thin film transistor) set on the lower glass substrate and CF (color filter) set on the upper glass substrate. The rotation direction of the liquid crystal molecules in the liquid crystal box is controlled by changing the signal and voltage on the TFT, thereby controlling the emission of polarized light at each pixel to achieve the purpose of displaying different patterns.

[0003] When manufacturing LCD display screens, accessories such as control IC, filter and deflection film are selected. However, the curling degree of LCD display screens in the prior art is low, and the flexibility and toughness are relatively poor. In addition, the LCD display screens in the prior art are fragile. However, compared with OLED display screens, LCD display screens have low costs and are suitable for large-size displays.

[0004] In addition, the LCD display screen in the prior art must provide a gap between the two upper substrates and the lower substrate during production. If both the upper substrate and the lower substrate are made of ultra-thin glass substrates, although a gap can be formed, the ductility is poor, and the glue frame is easy to debond when bent, so that the liquid crystal molecules in the liquid crystal box are easy to leak. If an ultra-thin plastic substrate is used, although it can be bent, the substrate is too soft and the gap is easy to change, so that the LCD display screen cannot display normally. Summary of the invention

[0005] An object of the present invention is to provide a flexible and foldable LCD display screen and a manufacturing method thereof. The flexible and foldable LCD display screen of the present invention can provide a gap and is flexibly foldable.

[0006] To achieve at least one of the above purposes of the present invention, the present invention provides a flexible and foldable LCD display screen, which includes a bendable transparent layer, a liquid crystal electrode portion, a drive layer and a foldable rigid supporting layer, wherein the liquid crystal electrode portion includes a liquid crystal portion, an upper electrode layer, a lower electrode layer and a driver, wherein the drive layer is sandwiched between the foldable rigid supporting layer and the liquid crystal electrode portion, and is electrically connected to the driver, wherein the liquid crystal portion is encapsulated between the upper electrode layer and the lower electrode layer, and the upper electrode layer is arranged between the bendable transparent layer and the upper side of the liquid crystal portion, and the lower electrode layer is arranged between the liquid crystal portion and the foldable rigid supporting layer.

[0007] According to an embodiment of the present invention, the bendable transparent layer is a bendable plastic substrate.

[0008] According to an embodiment of the present invention, the foldable rigid supporting layer is implemented as a foldable ultra-thin glass substrate.

[0009] According to an embodiment of the present invention, the upper electrode layer and the lower electrode layer are implemented as composite layers of ITO and metal grids.

[0010] According to an embodiment of the present invention, a filter is disposed between the upper electrode layer and the bendable transparent layer.

[0011] According to an embodiment of the present invention, the flexible and foldable LCD display screen further includes a transparent insulating layer, and the transparent insulating layer is disposed between the lower electrode layer and the foldable rigid supporting layer.

[0012] To achieve the above object, according to another aspect of the present invention, the present invention provides a method for manufacturing a flexible and foldable LCD display screen, wherein the method for manufacturing a flexible and foldable LCD display screen comprises the following steps:

[0013] (S1) attaching a provided foldable rigid carrier layer to a first glass carrier, and manufacturing a TFT driving circuit on a side of the foldable rigid carrier layer opposite to the first glass carrier to form a driving layer;

[0014] (S2) forming a lower electrode layer on the driving layer by a yellow light process;

[0015] (S3) printing a lower alignment film on a side of the lower electrode layer opposite to the driving layer;

[0016] (S4) attaching a provided bendable transparent layer to a second glass substrate, and manufacturing a filter on a side of the bendable transparent layer opposite to the second glass substrate by printing or photolithography;

[0017] (S5) forming an upper electrode layer on the side of the filter opposite to the bendable transparent layer through a yellow light process;

[0018] (S6) printing an upper alignment film on a side of the upper electrode layer opposite to the filter;

[0019] (S7) The foldable rigid bearing layer containing the lower alignment film prepared in step (S3) and the bendable transparent layer containing the upper alignment film prepared in step (S6) are bonded and packaged by using frame glue; one side of the upper alignment film and the lower alignment film is the bonding side; then the first glass carrier plate and the second glass carrier plate are peeled off by using laser;

[0020] (S8) Cutting the panel prepared in step (S7) into small panels by laser, then pouring liquid crystal into the small panels and sealing them;

[0021] (S9) The upper and lower sides of the small panel completed in step (S8) are bonded to an upper polarizer and a lower polarizer using optical adhesive; one side of the foldable rigid bearing layer is bonded to the lower polarizer, and the other side is bonded to the upper polarizer;

[0022] (S10) The small panel of polarizers bonded in step (S9) is attached to the driver IC and then bonded to the backlight diffusion film using optical adhesive, wherein the lower polarizer of the small panel is bonded to the backlight diffusion film.

[0023] According to an embodiment of the present invention, the method for manufacturing the flexible foldable LCD display screen comprises the following steps:

[0024] (S11) Before the frame glue bonding and packaging in the step (S7), a support column is first made on the upper alignment film and / or the lower alignment film, and the support column is arranged between the upper alignment film and the lower alignment film.

[0025] According to one embodiment of the present invention, the foldable rigid bearing layer is implemented as a foldable ultra-thin glass substrate, and an explosion-proof film is provided on at least one side of the ultra-thin glass substrate, and the bendable transparent layer is implemented as a PET substrate, and a hardened film is provided on at least one side of the PET substrate.

[0026] Further objects and advantages of the present invention will be fully apparent through understanding of the following description.

[0027] These and other objects, features and advantages of the present invention will be fully reflected in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic structural diagram of the flexible and foldable LCD display screen of the present invention is shown.

[0029] Figure 2 A schematic diagram showing another embodiment of the flexible and foldable LCD display screen of the present invention is shown. DETAILED DESCRIPTION

[0030] The preferred embodiments described below are for example only, and those skilled in the art may think of other obvious variations. The basic principles of the present invention defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0031] Those skilled in the art should understand that, in the disclosure of the present invention, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0032] In conjunction with the instruction manual Figure 1 and Figure 2 A flexible and foldable LCD display screen according to a preferred embodiment of the present invention will be described in detail below, wherein the flexible and foldable LCD display screen is flexible and foldable.

[0033] The flexible and foldable LCD display screen includes a bendable transparent layer 10, a liquid crystal electrode portion 20, a driving layer 30, a foldable rigid bearing layer 40, a filter 50, an upper polarizer 61, a lower polarizer 62 and a backlight diffusion film 80, wherein the liquid crystal electrode portion 20 includes a liquid crystal portion 21, an upper electrode layer 22 and a lower electrode layer 23, wherein the bottom side of the upper electrode layer 22 is arranged on the top side of the liquid crystal portion 21, wherein the top side of the lower electrode layer 23 is arranged on the bottom side of the liquid crystal portion 21, wherein The bottom side of the filter 50 is arranged on the top side of the upper electrode layer 22, wherein the bottom side of the bendable transparent layer 10 is arranged on the top side of the filter 50, wherein the top side of the bendable transparent layer 10 is attached to an upper polarizer 61, wherein the drive layer 30 is arranged between the bottom side of the lower electrode layer 23 and the top side of the foldable rigid bearing layer 40, wherein the top side of the lower polarizer 62 is arranged on the bottom side of the foldable rigid bearing layer 40, and the backlight diffusion film 80 is arranged on the bottom side of the lower polarizer 62. In addition, the liquid crystal portion 21 includes an upper alignment film and a lower alignment film and liquid crystal filled between the upper alignment film and the lower alignment film. A support column is provided between the upper alignment film and the lower alignment film.

[0034] Preferably, the bendable transparent layer 10 is implemented as a bendable ultra-thin PET substrate (plastic substrate). It is understandable that when the entire flexible foldable LCD display is bent, the PET substrate's own ductility and compressibility enable the flexible foldable LCD display to be bent.

[0035] More preferably, the foldable rigid bearing layer 40 is implemented as an ultra-thin glass substrate (UTG). It is understandable that, since the UTG substrate has a certain rigidity and is not as soft as a plastic substrate, the liquid crystal electrode portion 20 can be stably clamped between the bendable transparent layer 10 and the foldable rigid bearing layer 40.

[0036] It is worth mentioning that when the flexible foldable LCD display is bent, the bendable transparent layer 10 can provide the flexible foldable LCD display with the ability to extend and compress, while the foldable rigid supporting layer 40 can maintain the gap in the liquid crystal portion 21 of the liquid crystal electrode portion 20 without changing, so that the pattern can be displayed normally.

[0037] In addition, the upper electrode layer 22 and the lower electrode layer 23 are implemented as a composite layer of ITO and a metal grid. The material used for the metal grid is at least one of gold, silver, copper, aluminum, zinc or molybdenum.

[0038] Preferably, when the foldable rigid bearing layer 40 is implemented as a bendable ultra-thin glass substrate, at least one side thereof is provided with an explosion-proof film. It is worth mentioning that the provided explosion-proof film can prevent the foldable rigid bearing layer 40 from bursting.

[0039] More preferably, when the bendable transparent layer 10 is implemented as a PET substrate, a hardening film is provided on at least one side thereof.

[0040] In addition, the flexible and foldable LCD display screen further includes a transparent insulating layer 70 . The transparent insulating layer 70 is disposed between the driving layer 30 and the foldable rigid bearing layer 40 .

[0041] According to another aspect of the present invention, the present invention provides a method for manufacturing a flexible and foldable LCD display screen, wherein the method for manufacturing a flexible and foldable LCD display screen comprises the following steps:

[0042] (S1) attaching a provided foldable rigid carrier layer 40 to a first glass carrier, and coating SiO2 on a side of the foldable rigid carrier layer 40 opposite to the first glass carrier by a PVD or CVD vacuum coating method to complete the production of a transparent insulating layer 70, and then producing a TFT driving circuit on a side of the transparent insulating layer 70 opposite to the foldable rigid carrier layer 40 to form a driving layer 30;

[0043] (S2) forming a lower electrode layer 23 on the driving layer 30 by a yellow light process;

[0044] (S3) printing a lower alignment film on the side of the lower electrode layer 23 opposite to the driving layer 30;

[0045] (S4) affixing a provided bendable transparent layer 10 to a second glass substrate, and manufacturing a filter 50 on a side of the bendable transparent layer 10 opposite to the second glass substrate by printing or photolithography;

[0046] (S5) forming an upper electrode layer 22 on the side of the optical filter 50 opposite to the bendable transparent layer 10 through a yellow light process;

[0047] (S6) printing an upper alignment film on a side of the upper electrode layer 22 opposite to the filter 50;

[0048] (S7) The foldable rigid bearing layer (40) containing the lower alignment film prepared in step (S3) and the bendable transparent layer (10) containing the upper alignment film prepared in step (S6) are bonded and packaged by using a frame glue; one side of the upper alignment film and the lower alignment film is the bonding side; then the first glass carrier plate and the second glass carrier plate are peeled off by using a laser; (S8) The panel prepared in step (S7) is cut into small panels by using a laser, and then the small panels are filled with liquid crystal and sealed;

[0049] (S9) The upper and lower sides of the small panel completed in step (S8) are bonded to the upper polarizer 61 and the lower polarizer 62 using optical adhesive; one side of the foldable rigid bearing layer 40 is bonded to the lower polarizer 62, and the other side is bonded to the upper polarizer 61;

[0050] ( S10 ) The small panel of polarizers bonded in step ( S9 ) is attached to the driver IC and then bonded to the backlight diffusion film 80 using optical adhesive, and the lower polarizer 62 of the small panel is bonded to the backlight diffusion film 80 .

[0051] Preferably, the method for manufacturing the flexible foldable LCD display screen comprises the following steps: (S11) before the frame glue bonding and packaging in step (S7), a support column is first manufactured on the upper alignment film and / or the lower alignment film, and the support column is arranged between the upper alignment film and the lower alignment film. Preferably, the foldable rigid bearing layer 40 is implemented as a foldable ultra-thin glass substrate, and an explosion-proof film is arranged on at least one side of the ultra-thin glass.

[0052] More preferably, the bendable transparent layer 10 is implemented as a PET substrate, and a hardening film is disposed on at least one side of the PET substrate.

[0053] It should be understood by those skilled in the art that the embodiments of the present invention described above are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A method for manufacturing a flexible foldable LCD display screen, characterized in that: The method for manufacturing the flexible foldable LCD display screen comprises the following steps: S1: attaching a provided foldable rigid carrier layer to a first glass carrier, completing the production of a transparent insulating layer on a side of the foldable rigid carrier layer opposite to the first glass carrier by vacuum coating, and producing a driving circuit on a side of the transparent insulating layer opposite to the foldable rigid carrier layer to form a driving layer; S2, on the driving layer, a lower electrode layer is formed by a yellow light process; S3 printing a lower alignment film on a side of the lower electrode layer opposite to the driving layer; S4: attaching a provided bendable transparent layer to a second glass substrate, and manufacturing a filter on a side of the bendable transparent layer opposite to the second glass substrate by printing or photolithography; S5: on the side of the filter opposite to the bendable transparent layer, a top electrode layer is manufactured by a yellow light process; S6 printing an upper alignment film on a side of the upper electrode layer opposite to the filter; S7: The foldable rigid bearing layer containing the lower alignment film prepared in step S3 and the bendable transparent layer containing the upper alignment film prepared in step S6 are bonded and packaged by using a frame glue; one side of the upper alignment film and the lower alignment film is the bonding side; and then the first glass carrier plate and the second glass carrier plate are peeled off by using a laser; S8: using laser to cut the panel prepared in step S7 into small panels, then pouring liquid crystal into the small panels and sealing them; S9: The upper and lower sides of the small panel completed in step S8 are bonded to the upper polarizer and the lower polarizer by using optical adhesive; one side of the foldable rigid bearing layer is bonded to the lower polarizer, and the other side is bonded to the upper polarizer; S10: attach the small panel of polarizers bonded in step S9 to the driver IC and then bond it to the backlight diffusion film using optical adhesive, and bond the lower polarizer of the small panel to the backlight diffusion film.

2. The method for manufacturing a flexible foldable LCD display screen according to claim 1, characterized in that: The method for manufacturing the flexible foldable LCD display screen comprises the following steps: S11: before the frame glue bonding and packaging in step S7, a support column is first made on the upper alignment film and / or the lower alignment film, and the support column is arranged between the upper alignment film and the lower alignment film.

3. The method for manufacturing a flexible foldable LCD display screen according to claim 1, characterized in that: The foldable rigid bearing layer is an ultra-thin glass substrate, at least one side of the ultra-thin glass substrate is provided with an explosion-proof film, the bendable transparent layer is implemented as a PET substrate, and at least one side of the PET substrate is provided with a hardened film.

4. A flexible and foldable LCD display screen, characterized in that: The method is as described in any one of claims 1 to 3.

5. The flexible and foldable LCD display screen according to claim 4, characterized in that: The bendable transparent layer is bendable PET.

6. The flexible and foldable LCD display screen according to claim 4, characterized in that: The upper electrode layer and the lower electrode layer are implemented as composite layers of ITO and metal mesh.

7. The flexible and foldable LCD display screen according to claim 4 or 5, characterized in that: A hardening film is provided on at least one side of the bendable transparent layer.

8. The flexible and foldable LCD display screen according to claim 4 or 5, characterized in that: At least one side of the foldable rigid bearing layer is provided with an explosion-proof membrane.

9. The flexible and foldable LCD display screen according to claim 4, characterized in that: The flexible and foldable LCD display screen further includes a transparent insulating layer, and the transparent insulating layer is arranged between the driving layer and the foldable rigid bearing layer.

10. The flexible and foldable LCD display screen according to claim 4, characterized in that: The foldable rigid carrier layer is implemented as a foldable ultra-thin glass substrate.

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