CN110423020B

CN110423020B - Foldable ultrathin glass protective cover plate with circular polarization function and manufacturing method

Info

Publication number: CN110423020B
Application number: CN201910691187.7A
Authority: CN
Inventors: 赖耀升; 金渶桓; 江建志
Original assignee: Aeneq Co ltd
Current assignee: Aeneq Co ltd
Priority date: 2019-07-29
Filing date: 2019-07-29
Publication date: 2021-09-17
Anticipated expiration: 2039-07-29
Also published as: CN110423020A

Abstract

The invention discloses a foldable ultrathin glass protective cover plate with a circular polarization function, which comprises ultrathin glass, wherein an ink frame is printed below the ultrathin glass, an explosion-proof layer is coated below the ink frame, a nanoscale WGP (micro-groove waveguide) polarizer is printed below the explosion-proof layer, and an 1/4 lambda phase difference film is coated below the nanoscale WGP polarizer.

Description

Foldable ultrathin glass protective cover plate with circular polarization function and manufacturing method

Technical Field

The invention belongs to the field of mobile phone folding display screens, and particularly relates to a foldable ultrathin glass protective cover plate with a circular polarization function and a manufacturing method thereof.

Background

Since the year 2019, companies including samsung, kyotong, etc. have successively released fully self-developed foldable self-luminous OLED flexible screens. Based on network messages, companies such as samsung, huashi, rouyu, and millet have made related foldable mobile phone products. Unicom even in officers means "fold screen handset not far away! "

The flexible screen essential to the folding screen mobile phone has the advantages of being ultra-strong in portability, high in resolution, high in brightness, low in energy consumption and the like, and the mobile phone adopting the technology can provide high image quality in the future and can further enhance cruising ability by expanding the battery space.

The folding screen mobile phones released in the market at present have many problems, for example, various problems occur on the screen of a tester just released by a three-star Galaxy Fold. So at present, no mobile phone manufacturer really sells the folding screen mobile phone in mass production. One of the problems is that the protective cover plate is made of transparent plastic material, the hardness is insufficient, and the crease is easy to generate.

The foldable screen mobile phone has the advantages that the flexible OLED display panel can be folded, the outer protective cover plate of the flexible OLED display panel also needs to be foldable, the glass cover plate covers the OLED panel, and in the whole mobile phone display screen, other functional layers such as a polarizer are needed between the glass cover plate and the panel layer.

The polaroid that OLED used must be the circular polaroid, and the circular polaroid realizes the circular polarization by a slice polaroid and a slice 1/4 lambda phase difference membrane, and the traditional way is that the circular polaroid laminates alone at present, if meet folding OLED panel, this kind of way has directly increased the thickness of whole folding display screen, is unfavorable for the screen to fold, and the circular polaroid produces the skew with glass apron or OLED panel easily after folding moreover.

For a folding screen, the thicker the thickness and the more adhesive layers, the more difficult it is to fold, and the larger the angle of folding.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the circular polarizer which does not need to be adhered by optical cement, not only integrates the functions of the circular polarizer, but also omits the thickness and the adhering process of the optical cement and the traditional circular polarizer base material, so that the functions of the circular polarizer and the glass cover plate are integrated, the bendable angle of the glass cover plate is effectively reduced, the bent circular polarizer and the glass cover plate body can not deviate, and the circular polarizer is particularly suitable for being used by mobile phones or electronic equipment with internally folded screens.

In order to achieve the purpose, the invention provides the following technical scheme: the foldable ultrathin glass protective cover plate with the circular polarization function comprises ultrathin glass, wherein an ink frame is printed below the ultrathin glass, an explosion-proof layer is coated below the ink frame, a nanoscale WGP (micro-groove waveguide) polarizer is printed below the explosion-proof layer, and an 1/4 lambda phase difference film is coated below the nanoscale WGP polarizer.

Further, the explosion-proof layer is a transparent resin coating.

The nano WGP polarizer is made of nano silver.

Further, a plurality of strip-shaped grooves are formed in the transparent resin coating, and the nanoscale WGP polaroid is printed in the grooves.

The thickness of the ink frame is 6-8 microns.

Further the transparent resin coating has a thickness of 30 to 60 micrometers.

And further, an anti-fouling coating is arranged above the ultrathin glass.

A method for manufacturing a foldable ultrathin glass protective cover plate with a circular polarization function comprises the following steps,

1) printing a required ink frame on the lower surface of the ultrathin glass in a gravure printing mode, wherein the thickness of the ink frame is 6-8 microns;

2) the lower surface of the ink frame is coated with a layer of transparent resin coating, and the thickness of the transparent resin coating is 30-60 microns;

3) then, printing a layer of nano WGP polaroid on the lower surface of the transparent resin coating by using a printing method, wherein the specific process comprises the following steps: firstly, forming a groove on a transparent resin coating by using a mold with a stripe-shaped convex structure and applying a nanoimprint technology; secondly, filling only the groove portion with metal ink by using a blade; finally, baking the metal gate WGP polaroid by using an oven;

4) an 1/4 lambda phase difference film was coated under the nanoscale WGP polarizer.

The method further comprises the following step of arranging an anti-fouling layer on the upper surface of the ultrathin glass, wherein the step is arranged before the step 1) or after the step 4).

The material of the nano-scale WGP polaroid in the step 3) is nano-silver.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the glass cover plate, the nano WGP polaroid is printed on the body of the glass cover plate in a printing mode, linear polarization is achieved, the 1/4 lambda phase difference film is coated in a coating mode, the circular polarization function is achieved, and the body of the glass cover plate is a part for removing the circular polarization. The circular polaroid is not required to be adhered by optical cement, so that the functions of the circular polaroid are integrated, the thickness and the laminating process of the optical cement and the traditional circular polaroid base material are omitted, the functions of the circular polaroid and the glass cover plate are integrated, the bendable angle of the glass cover plate is effectively reduced, the circular polaroid and the body of the glass cover plate cannot deviate after being bent, and the circular polaroid is particularly suitable for being used by mobile phones or electronic equipment with internally-folded screens;

2. the transparent resin coating of 30-60 microns has low material cost and low process cost, and can effectively achieve the explosion-proof effect;

3. the ink frame printed by the gravure printing device can be used for printing various frame colors such as blue, golden and the like, and can be applied to mobile phones with different colors.

Drawings

FIG. 1 is a schematic structural diagram of a foldable ultra-thin glass protective cover plate with circular polarization function according to the present invention;

FIG. 2 is a schematic diagram of a process for fabricating a nanoscale WGP polarizer according to the present invention;

FIG. 3 is a schematic view of the structure of the pad printing apparatus used in the present invention.

Reference numerals: 1. an anti-fouling coating; 2. ultra-thin glass; 3. printing ink frame; 4.1, an explosion-proof layer; 4.2, a nano WGP polaroid; 5. 1/4 lambda phase difference film; 6. a mold; 7. a groove; 8. a metallic ink; 9. a blade; 51. a jig; 52. a pad printing roller; 53. a gravure cylinder; 54. an ink bin; 55. an ink roller; 56. a doctor blade.

Detailed Description

Embodiments of the foldable ultra-thin glass protective cover plate with circular polarization function according to the present invention will be further described with reference to fig. 1 to 3.

In the description of the present invention, it should be noted that, for the terms of orientation, such as "central", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate that the orientation and positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific scope of the present invention.

Furthermore, if the terms "first" and "second" are used for descriptive purposes only, they are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. Thus, a definition of "a first" or "a second" feature may explicitly or implicitly include one or more of the features, and in the description of the invention, "a number" or "a number" means two or more unless explicitly specified otherwise.

A foldable ultrathin glass protective cover plate with a circular polarization function comprises ultrathin glass 2, wherein an ink frame 3 is printed below the ultrathin glass 2, an explosion-proof layer 4.1 is coated below the ink frame 3, a nanoscale WGP (WGP) polarizer 4.2 is printed below the explosion-proof layer 4.1, and an 1/4 lambda phase difference film 5 is coated below the nanoscale WGP polarizer 4.2.

The nanometer WGP polaroid 4.2 and the 1/4 lambda phase difference film 5 jointly form a circular polaroid, wherein the WGP polaroid is combined with a glass cover plate body (combination of the ultrathin glass 2, the ink frame 3 and the explosion-proof layer 4.1) in a printing mode, optical glue and a traditional circular polaroid base material are omitted, so that the function of the circular polaroid and the glass cover plate are integrated, the bending angle of the glass cover plate is effectively reduced, and the bent circular polaroid and the glass cover plate body cannot deviate.

The preferable material of the nano WGP polarizer 4.2 is nano silver.

Ink frame 3 the thickness of ink frame 3 is 6-8 microns, and it is used for shielding the display screen and shows the external component of area, and in addition there is the shading effect, and ink frame 3 can print various frame colours such as blue, gold, can also realize through frame template design that the depth of printing ink reaches the texture effect, can also print different shapes and colour many times and reach color and pattern effect, and the ink frame 3 of different colours can be applicable to the cell-phone collocation of different colours.

The preferred explosion-proof layer 4.1 of this embodiment is the transparent resin coating, and the thickness of transparent resin coating is 30-60 microns, and the transparent resin coating is the CPI that the best application effect at present, has good explosion-proof effect when reaching certain thickness for the glass apron can not splash away when receiving striking cracked, and the transparent resin coating is coated on ink frame 3.

The ink frame 3 is printed on the edge of the ultra-thin glass 2, and when the explosion-proof layer 4.1 is actually coated, one part of the explosion-proof layer 4.1 contacts the ink frame 3, and the other part contacts the surface of the ultra-thin glass 2.

Preferably, the transparent resin coating is provided with a plurality of strip-shaped grooves 7, and the nano WGP polarizer 4.2 is printed in the grooves 7.

The ultra-thin glass 2 adopted by the scheme is ultra-thin toughened glass with the thickness of 30-100 microns, and German Schottky corporation has started to supply flexible glass with the thickness of 25-100 microns in batches in 2013, the width of the glass is about 50cm, and the length of the glass is hundreds of meters. In 2014, Asahi glass company of Japan made a flexible glass SPOOL with a thickness of 0.05mm by the float method. Chinese patent CN10404521B discloses a method for preparing flexible ultra-thin glass 2. Chinese patent 201710261451.4 has disclosed WGP polarizers.

The ink frame 3 of the present embodiment is printed by using a pad printing device, as shown in fig. 3, which mainly includes an ink chamber 54, an intaglio cylinder 53, a pad printing cylinder 52 and a jig 51, wherein the pad printing cylinder 52 is a rubber roller.

The printing ink is placed in an ink chamber, an ink roller 55 is further arranged in the ink chamber, the ink roller 55 is abutted against an intaglio roller 53, the ink roller 55 sucks the printing ink in the ink chamber and transfers the printing ink into an intaglio of the intaglio roller 53, the intaglio roller 53 rotates along the direction a, a doctor blade 56 is arranged beside the intaglio roller 53 to scrape the printing ink in the intaglio of the intaglio roller 53, the intaglio roller 53 transfers the printing ink in the intaglio to the surface of a transfer printing roller 52, the transfer printing roller 52 rotates along the direction b, the ultrathin glass 2 is placed on a jig 51 and moves along the direction c, the ultrathin glass 2 passes below the transfer printing roller 52, the transfer printing roller 52 prints an ink frame 3 on the surface of the ultrathin glass 2, and the ink frame 3 layers reach 6-8 microns through repeated printing.

Each layer of the ultrathin glass 2 protective cover plate in the embodiment adopts a printing or coating mode, optical cement is not needed, the traditional circular polarizer base material is omitted, the overall thickness is reduced at first, and crease marks are not easy to generate during bending.

In the embodiment, an anti-fouling coating 1 is preferably arranged above the ultrathin glass 2, and the anti-fouling coating 1 is coated on the upper surface of the ultrathin glass 2.

A method for manufacturing a foldable ultrathin glass 2 protective cover plate with a circular polarization function comprises the following steps,

1) printing a required ink frame 3 on the lower surface of the ultrathin glass 2 in a gravure printing mode, wherein the thickness of the ink frame 3 is 6-8 microns;

2) the lower surface of the ink frame 3 is coated with a layer of transparent resin coating, and the thickness is 30-60 microns;

3) then, a layer of nano WGP polarizer 4.2 is printed on the lower surface of the transparent resin coating, as shown in figure 2, the specific process is as follows: firstly, using a mold 6 with a stripe-shaped convex structure, forming a groove 7 on a transparent resin coating layer by using a nanoimprint technology; secondly, only the groove 7 is partially filled with the metal ink 8 by using the blade 9; finally, baking the metal gate WGP polaroid by using an oven;

4) an 1/4 lambda retardation film 5 is coated under the nanoscale WGP polarizer 4.2.

The present embodiment preferably further includes a step of providing an anti-smudge layer on the upper surface of the ultra-thin glass 2, which is disposed before step 1) or after step 4).

In this embodiment, the material of the nano-WGP polarizer 4.2 (i.e., the metallic ink 8) in the step 3) is preferably nano-silver.

By using the low reflectivity of the WGP polarizer with high-durability metal, the visible light polarizer with low reflectivity and high-strength durability is realized. The visible light wavelength used for the metal WGP polarizer for visible light is much thinner than (400-800nm), the polarization characteristic is improved by making the metal grid thinner and thicker, and the line width is thinner than the previously verified 80 nm. And the thick film nano printing technology of the metal ink 8 pattern with the line width of less than 50nm and the aspect ratio of more than 10 is realized by combining the nano imprinting technology, the humidity control technology and the printing technology again.

The transparent resin coating in the embodiment is used as an explosion-proof layer 4.1 and a carrier of a nano WGP polaroid 4.2, so that the adhesion of optical cement and a traditional circular polaroid substrate are omitted, and the overall thickness is greatly reduced.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims

1. The utility model provides a collapsible ultra-thin glass protection apron with circular polarization function which characterized in that: the printing ink comprises ultra-thin glass, wherein an ink frame is printed below the ultra-thin glass, an explosion-proof layer is coated below the ink frame, a nanoscale WGP polarizer is printed below the explosion-proof layer, and an 1/4 lambda phase difference film is coated below the nanoscale WGP polarizer;

the forming process of the nanoscale WGP polaroid comprises the following steps of firstly, forming a groove on the explosion-proof layer by using a mold with a stripe-shaped convex structure and applying a nanoimprint technology; secondly, filling only the groove portion with metal ink by using a blade; and finally, baking the metal gate WGP polaroid by using an oven.

2. The foldable ultra-thin glass protective cover plate with circular polarization function according to claim 1, wherein: the explosion-proof layer is a transparent resin coating.

3. The foldable ultra-thin glass protective cover plate with circular polarization function according to claim 2, wherein: the nano WGP polaroid is made of nano silver.

4. The foldable ultra-thin glass protective cover plate with circular polarization function according to claim 3, wherein: the thickness of the ink frame is 6-8 microns.

5. The foldable ultra-thin glass protective cover plate with circular polarization function according to claim 3, wherein: the thickness of the transparent resin coating is 30-60 microns.

6. The foldable ultra-thin glass protective cover plate with circular polarization function according to claim 1, wherein: and an anti-fouling coating is arranged above the ultrathin glass.

7. A method for manufacturing a foldable ultra-thin glass protective cover plate with circular polarization function according to claim 1, comprising the steps of,

8. The method for manufacturing the foldable ultrathin glass protective cover plate with the circular polarization function according to claim 7, is characterized in that: the method also comprises the following step of arranging an anti-fouling layer on the upper surface of the ultrathin glass, wherein the step is arranged before the step 1) or after the step 4).

9. The method for manufacturing the foldable ultrathin glass protective cover plate with the circular polarization function according to claim 8, is characterized in that: the nano WGP polaroid in the step 3) is made of nano silver.