Flexible electronic paper display device and preparation process thereof

Abstract

The invention relates to a flexible electronic paper display device and a preparation process thereof, and the flexible electronic paper display device comprises a flexible substrate; the electronic paper, the front OCA and the front waterproof film are sequentially arranged above the flexible substrate; a back OCA and a back waterproof film are sequentially arranged below the flexible substrate, and a front sealing frame is further arranged above the flexible substrate and used for sealing interlayer intervals among the electronic paper, the front OCA, the front waterproof film and the flexible substrate. And a back sealing frame is also arranged below the flexible substrate and is used for sealing an interlayer interval among the back OCA, the back waterproof film and the flexible substrate. According to the flexible electronic paper display device, the upper interlayer and the lower interlayer are attached in a waterproof mode, the product is good in waterproof stability, flexible, bendable, resistant to falling and light and thin, laser cutting can be adopted, and it is ensured that the product tolerance precision meets + / -0.05 mm. The preparation process is high in production efficiency and good in product precision.

Description

Technical Field

[0001] The present invention belongs to the field of electronic paper display, and in particular relates to a flexible electronic paper display device and a preparation process thereof. Background Art

[0002] Existing electronic paper display products such as Figure 1-2 As shown, it is mainly a glass dot matrix display screen. The product is waterproofed by glass substrate + electronic paper upper front waterproof film + glue. It has the following limitations: 1. The product is thick and cannot be bent; 2. The glue mainly uses thermosetting glue, which has the limitation of being crisp; and it is difficult to dispense glue on narrow-edge window products and it is easy to overflow.

[0003] At present, the development of electronic paper products shows a trend of becoming lighter, thinner and more flexible. The existing waterproof structure and process for glass screens cannot meet the requirements of flexible bending. Therefore, it is necessary to develop flexible electronic paper display devices and explore the product structure and production process that meet the waterproof requirements of flexible electronic paper display products. Summary of the invention

[0004] In view of the shortcomings of existing glass screen electronic paper devices, the present invention provides a flexible electronic paper display device and a preparation process thereof. The product has good waterproof stability, high uniformity of product appearance dimensions, and is also bendable, drop-resistant, and thin.

[0005] A first aspect of the present invention provides a flexible electronic paper display device, comprising a flexible substrate; electronic paper, a front OCA, and a front waterproof film are sequentially arranged above the flexible substrate; a back OCA and a back waterproof film are sequentially arranged below the flexible substrate, a front sealing frame is also arranged above the flexible substrate, used for sealing the interlayer interval between the electronic paper, the front OCA, the front waterproof film and the flexible substrate; a back sealing frame is also arranged below the flexible substrate, used for sealing the interlayer interval between the back OCA, the back waterproof film and the flexible substrate.

[0006] By using a flexible substrate to bond the electronic paper, combined with the upper and lower interlayer waterproof bonding, the product has good waterproof stability, and is flexible, bendable, drop-resistant, and thin. The product structure is suitable for laser cutting, which can ensure that the product tolerance accuracy meets ±0.05mm.

[0007] Another aspect of the present invention provides a process for preparing the above-mentioned flexible electronic paper display device, comprising the steps of:

[0008] 1) Preparing a flexible substrate;

[0009] 2) Laminating the electronic paper: Laminating the cut electronic paper on the front of the flexible substrate;

[0010] 3) Laminating OCA: Laminating OCA on the front side of the electronic paper to obtain the front side OCA, and laminating OCA on the back side of the flexible substrate to obtain the back side OCA;

[0011] 4) Shape cutting: cutting the above-mentioned laminated products according to the shape of the product display area;

[0012] 5) Laminating a waterproof film: Laminating a waterproof film above the front OCA and below the back OCA respectively to obtain a front waterproof film and a back waterproof film, and then performing a degassing treatment;

[0013] 6) Glue dispensing and curing to form front and back glue sealing frames; select waterproof glue, and dispense glue on the electronic paper, front OCA, the interlayer between the front waterproof film and the flexible substrate, and the interlayer between the back OCA, the back waterproof film and the flexible substrate, and cure to obtain the front glue sealing frame and the back glue sealing frame;

[0014] 7) Product shape cutting.

[0015] Preferably, in step 1), the flexible substrate is designed diagonally and is provided with positioning holes. The diagonal design can improve the utilization rate of the electronic paper. The positioning holes can provide a guarantee for the subsequent lamination accuracy.

[0016] Preferably, in step 2), CCD laser is used to cut the electronic paper. CCD is a laser cutting device loaded with a camera, which can visually recognize patterns, accurately position and cut, and automatically find edges, greatly improving the cutting accuracy and production efficiency.

[0017] Preferably, in step 2), the cutting parameters are: shape half-cutting frequency: 3.5%, cutting speed is 40 mm / s, laser pulse duty cycle is 14.2%, and minimum signal value is 3; via cutting frequency: 3.5%, cutting speed is 30 mm / s, laser pulse duty cycle is 5.7%, and minimum signal value is 1.5.

[0018] Preferably, in step 2), the electronic paper is laminated by a flapper, and the lamination parameters are temperature: 42°, pressure: 0.2 MPa, and speed: 15 mm / s.

[0019] Preferably, in step 5), the front waterproof film is firstly attached and then the back waterproof film is attached, so as to ensure the attachment accuracy and reduce the difficulty of glue dispensing.

[0020] Preferably, in step 5), the waterproof film lamination parameters are: room temperature, pressure 0.25 MPa, speed 20 mm / s.

[0021] Preferably, in step 5), the degassing parameters are: temperature: 50°, pressure: 0.5 MPa, time: 1H.

[0022] Preferably, in step 6), during curing, pressing is combined with UV curing to ensure the thickness of the product while curing.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The flexible electronic paper display device of the present invention uses a flexible substrate to bond electronic paper, combined with upper and lower interlayer waterproof bonding, the product has good waterproof stability, is flexible, bendable, drop-resistant, thin and light, and can be laser cut to ensure that the product tolerance accuracy meets ±0.05mm.

[0025] The preparation process of the present invention has high production efficiency and improves the ability to produce multiple products at one time. The obtained products have good waterproof stability, high uniformity of product appearance dimensions, are bendable, drop-resistant and thin, and the product thickness can reach about 0.5 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the front structure of a glass substrate device in the prior art;

[0027] Figure 2 It is a schematic diagram of the cross-sectional structure of a glass substrate device in the prior art;

[0028] Figure 3 This is a schematic diagram of the cross-sectional structure of the flexible electronic paper display device of the present invention;

[0029] Figure 4 This is a process flow chart for preparing the flexible electronic paper display device of the present invention;

[0030] Figure 5 It is a schematic diagram of the device structure after the electronic paper is attached in the preparation process of the present invention;

[0031] Figure 6 It is a schematic diagram of the device structure after OCA bonding in the preparation process of the present invention;

[0032] Figure 7 It is a schematic diagram of the device structure after the waterproof film is attached in the preparation process of the present invention. DETAILED DESCRIPTION

[0033] The specific implementation of the present invention is further described below in conjunction with the specific drawings.

[0034] refer to Figure 3The present invention provides a flexible electronic paper display device, including a flexible substrate 5; an electronic paper 4, a front OCA 2, and a front waterproof film 1 are sequentially arranged above the flexible substrate 5; a back OCA 6 and a back waterproof film 8 are sequentially arranged below the flexible substrate 5; a front sealing frame 3 is also arranged above the flexible substrate 5, which is used to seal the electronic paper, the front OCA, the front waterproof film and the interlayer interval between the flexible substrate; a back sealing frame 7 is also arranged below the flexible substrate 5, which is used to seal the interlayer interval between the back OCA, the back waterproof film and the flexible substrate.

[0035] By using a flexible substrate to collage electronic paper, and then combining the front and back waterproof films to form an upper and lower sandwich waterproof structure design, the product has good waterproof stability, and is flexible, bendable, drop-resistant, and thin. The product thickness can be more than 0.5m. In a specific embodiment, the product thickness is 0.58mm.

[0036] The present invention also provides a process for preparing the above-mentioned flexible electronic paper display device, referring to Figure 4 , including the steps of:

[0037] 1) Prepare a flexible substrate.

[0038] Flexible substrates can be transformed from traditional monolithic Figure 5 The diagonal design shown improves the utilization rate of the electronic paper.

[0039] In addition, positioning holes can be designed on the flexible substrate to ensure the accuracy of subsequent waterproof film adhesive bonding, such as standard 2.0 mm positioning holes.

[0040] 2) Laminating the electronic paper: Laminating the cut electronic paper on the front side of the flexible substrate.

[0041] First, the electronic paper needs to be cut to obtain the assembled electronic paper. Preferably, the electronic paper conductive holes and the shape can be aligned and cut by CCD laser marking.

[0042] In a specific embodiment, a full-page E-paper (electronic paper) is placed on the CCD cutting machine platform, and a laser light point height tester is used to ensure that the water jet light point is in the best position, and the product frame is followed to ensure that all cutting points are within the cutting range; cutting is performed after the cutting parameters are checked to be correct. Among them, the shape half-cutting frequency: 3.5%, the cutting speed is 40mm / s, the laser pulse duty cycle is 14.2%, and the minimum signal value is 3; the through hole cutting frequency: 3.5%, the cutting speed is 30mm / s, the laser pulse duty cycle is 5.7%, and the minimum signal value is 1.5.

[0043] After cutting, the cut panelized electronic paper and the flexible substrate are bonded together using a panel turning machine.

[0044] In a specific embodiment, the laminating parameters of the flapper are set as follows: temperature: 42°, pressure: 0.2 MPa, speed: 15 mm / S.

[0045] After the electronic paper is bonded, the core flexible electronic paper display structure is obtained, such as Figure 5 As shown, the panelized electronic paper is placed on the front side of the flexible substrate.

[0046] 3) Laminating OCA: Laminating OCA on the front side of the electronic paper to obtain the front side OCA, and laminating OCA on the back side of the flexible substrate to obtain the back side OCA.

[0047] OCA (Optical Clear Adhesive) is a substrate-free optically transparent double-sided adhesive used for display device bonding. Through front OCA bonding, it can ensure that the front waterproof film of the subsequent electronic paper effective display area is fully bonded, and back OCA bonding can ensure that the back waterproof film is fully combined with the flexible substrate to avoid defects caused by immersion into the display area and the back of the substrate during dispensing.

[0048] The device structure obtained after OCA bonding is as follows Figure 6 As shown in the figure, the bottom layer is a flexible substrate, the middle layer is electronic paper, and the OCA is a surface layer, which are located on the front side of the electronic paper and the back side of the flexible substrate respectively.

[0049] 4) Product shape cutting: Cut the above-mentioned bonded products according to the shape of the product display area.

[0050] Through shape cutting, the consistency of the product can be ensured.

[0051] 5) Laminating waterproof films: Laminating waterproof films on the upper side of the front OCA and on the lower side of the back OCA respectively to obtain a front waterproof film and a back waterproof film, and then performing a degassing treatment.

[0052] An optional flexible, soft, ultra-thin waterproof membrane can be laminated.

[0053] When laminating, first laminarize the front waterproof film and then the back waterproof film. The reason for laminating the front waterproof film first is to ensure the accuracy of lamination and reduce the difficulty of gluing.

[0054] In a specific embodiment, the waterproof film bonding parameters are: room temperature, pressure 0.25 MPa, speed 20 mm / S.

[0055] After lamination, in order to remove the bubbles between the interlayers and ensure the visibility and flatness of the display area, the lamination bubbles are squeezed out by degassing.

[0056] In a specific embodiment, positive pressure degassing is adopted, and the setting parameters are: temperature: 50°, pressure: 0.5 MPa, time: 1H.

[0057] After attaching the front and back waterproof films, the device structure is as follows Figure 6 As shown, the bottom layer is the back waterproof film, the middle layers are the back OCA, the flexible electronic paper display, the front OCA, and the top layer is the front waterproof film, so that an effective waterproof interlayer is achieved on the upper and lower surfaces of the core flexible electronic paper display layer.

[0058] 6) Glue is dispensed and cured to form front and back sealing frames.

[0059] Waterproof glue is selected and dispensed on the electronic paper, the front OCA, the interlayer between the front waterproof film and the flexible substrate, and the interlayer between the back OCA, the back waterproof film and the flexible substrate, and cured to obtain the front glue sealing frame and the back glue sealing frame.

[0060] Preferably, a pressing jig and UV curing are used during curing to ensure the thickness of the product while curing.

[0061] 7) Product shape cutting.

[0062] Finally, the product shape is cut to ensure the consistency of the product shape and avoid high-precision tolerances in the fitting process. At the same time, the production capacity is greatly accelerated.

[0063] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A flexible electronic paper display device, characterized in that: including a flexible substrate; Electronic paper, front OCA and front waterproof film are arranged in sequence above the flexible substrate; The back side OCA and the back side waterproof film are arranged in sequence below the flexible substrate. A front sealing frame is also provided above the flexible substrate to seal the electronic paper and the front OCA. The interlayer area between the front waterproof film and the flexible substrate; A back side sealing frame is also provided below the flexible substrate to seal the interlayer space between the back side OCA, the back side waterproof film and the flexible substrate.

2. The process for preparing the flexible electronic paper display device according to claim 1, characterized in that: Includes steps: 1) Preparing a flexible substrate; 2) Laminating the electronic paper: Laminating the cut electronic paper on the front of the flexible substrate; 3) Laminating OCA: Laminating OCA on the front side of the electronic paper to obtain the front side OCA, and laminating OCA on the back side of the flexible substrate to obtain the back side OCA; 4) Shape cutting: cutting the above-mentioned laminated products according to the shape of the product display area; 5) Laminating a waterproof film: Laminating a waterproof film above the front OCA and below the back OCA respectively to obtain a front waterproof film and a back waterproof film, and then performing a degassing treatment; 6) Glue dispensing and curing to form front and back glue sealing frames; select waterproof glue, and dispense glue on the electronic paper, front OCA, the interlayer between the front waterproof film and the flexible substrate, and the interlayer between the back OCA, the back waterproof film and the flexible substrate, and cure to obtain the front glue sealing frame and the back glue sealing frame; 7) Product shape cutting.

3. The preparation method according to claim 2, characterized in that: In step 1), the flexible substrate is designed diagonally and is provided with positioning holes.

4. The preparation method according to claim 2, characterized in that: In step 2), CCD laser is used to cut the electronic paper.

5. The preparation method according to claim 4, characterized in that: In step 2), the cutting parameters are: Outer shape half-cutting frequency: 3.5%, cutting speed 40mm / s, laser pulse duty cycle 14.2%, minimum signal value 3; The cutting frequency of the via hole is 3.5%, the cutting speed is 30 mm / s, the laser pulse duty cycle is 5.7%, and the minimum signal value is 1.

5.

6. The preparation method according to claim 2, characterized in that: In step 2), the electronic paper is laminated by a flipping machine, and the laminating parameters are temperature: 42°, pressure: 0.2Mpa, and speed: 15mm / S.

7. The preparation method according to claim 2, characterized in that: In step 5), the front waterproof film is first attached, and then the back waterproof film is attached.

8. The preparation method according to claim 2, characterized in that: In step 5), the waterproof film lamination parameters are: room temperature, pressure 0.25 MPa, speed 20 mm / s.

9. The preparation method according to claim 8, characterized in that: In step 5), degassing parameters are: temperature: 50°, pressure: 0.5 MPa, time: 1 H.

10. The preparation method according to claim 2, characterized in that: In step 6), during curing, a combination of pressing and UV curing is used.

Images