CN115167056A - A microcup display unit with self-healing function and its packaging method and application - Google Patents

Abstract

The application belongs to the technical field of electrophoretic display, and particularly relates to a micro-cup display unit with a self-repairing function, and a packaging method and application thereof; the utility model provides an among the little cup display element because formed strong and weak hydrogen bond between little cup and the encapsulated layer, the disulfide bond etc. have dynamic noncovalent bond and the dynamic covalent bond of self-repair function, receive external force and assault when little cup display element, encapsulated layer and little cup damage back, rely on strong and weak hydrogen bond, the bond of disulfide bond can let cracked bond recombine by the bond of disulfide bond, do not rely on bonding material, the selfreparing between encapsulated layer and the little cup has just been accomplished, it receives external force and assaults the back to have solved little cup display element, encapsulated layer and little cup damage lead to the electronic ink to leak, cause the reunion of electrified nanometer colour particle in the electronic ink, the technical problem of image display effect decay.

Description

A microcup display unit with self-healing function and its packaging method and application

technical field

The present application belongs to the technical field of electrophoresis display, and in particular, relates to a microcup display unit with self-healing function and a packaging method and application thereof.

Background technique

The backlight generated by traditional electronic displays, such as liquid crystal displays, can easily cause eye fatigue, leading to eye diseases such as myopia, and liquid crystal displays have high power consumption and heavy size, while electronic paper based on electrophoretic display technology does not produce backlight, power consumption Low and thin, it is a new type of display.

The micro-cup display unit is distributed on the surface of the electronic paper, and the image is displayed by the micro-cup display unit. The micro-cup in the micro-cup display unit contains electronic ink, and the electronic ink contains charged nano-color particles. When the bottom electrodes on the upper and lower sides of the micro-cup display unit and When the top electrode is applied with an electric field, the charged nano-color particles will be driven by the electric field to move, thereby displaying the pattern; the packaging methods of the microcup display unit in the prior art mainly include a one-step packaging method and a two-step packaging method. Mix the incompatible encapsulation layer material with the electronic ink. Since the encapsulation layer material is incompatible with the electronic ink and the density of the encapsulation layer material is small, the encapsulation layer material will float to the surface of the electronic ink, and the encapsulation layer material will be cured to complete the microcup. Encapsulation, while the two-step encapsulation method is to first prepare the microcup, then inject the electronic ink into the microwave, and then coat the encapsulation layer material on the surface of the electrophoretic liquid and cure it to complete the encapsulation; the one-step encapsulation method requires the selection of specific materials, that is, the encapsulation layer. The material is incompatible with the electronic ink and the density of the encapsulation layer material is lower than that of the electrophoretic liquid. The process is cumbersome, and the encapsulation effect is not good in the actual operation, which makes the electronic ink in the microcup display unit easy to leak, and the leakage of the electronic ink causes the charged nano-color. Particle agglomeration, electronic paper image display effect attenuation, etc.; while the microcup in the two-step packaging method is often made of nylon mesh and other materials, and the packaging layer material is often made of resin binder and other materials, relying on the adhesive force of the resin binder. Microcups are encapsulated, but the microcup display unit encapsulated with resin adhesive and other materials cannot self-repair the microcup display unit after being damaged by external force, resulting in easy leakage of the electronic ink in the microcup.

SUMMARY OF THE INVENTION

In view of this, the present application provides a microcup display unit with a self-healing function and a packaging method and application thereof, which are used to solve the problems caused by damage to the packaging layer and the microcup after the microcup display unit in the prior art is impacted by an external force. The leakage of electronic ink causes the agglomeration of charged nano-color particles, and the technical problem of image display effect attenuation.

A first aspect of the present application provides a microcup display unit with a self-healing function, the microcup display unit comprising: a bottom transparent electrode, a microcup, electronic ink, an encapsulation layer and a top transparent electrode;

the microcup is located on the surface of the bottom transparent electrode;

the microcup contains the electronic ink;

the encapsulation layer encapsulates the microcup;

the encapsulation layer is located on the surface of the top transparent electrode;

The material of the encapsulation layer is a transparent elastomer containing diisocyanate, disulfide or imine group;

The material of the microcup is a transparent elastomer containing diisocyanate, disulfide or imine group.

Preferably, the transparent elastomer is a silicone elastomer and/or a polyurethane elastomer.

Preferably, the bottom transparent electrode and the top transparent electrode are both 4 cm long and 4 cm wide;

The height of the microcup is 20-40 microns, and the thickness is 20-50 microns.

The thickness of the encapsulation layer is 3-6 microns.

Preferably, the bottom transparent electrode and the top transparent electrode are independently selected from PEDOT electrodes, ITO electrodes, IZO, MZO, carbon nanotubes or nanosilver.

Preferably, the electronic ink is selected from white electrophoretic ink, black electrophoretic ink, black and white mixed electrophoretic ink or colored electrophoretic ink.

It should be noted that white electrophoretic ink is electronic ink containing white charged particles, black electrophoretic ink is electronic ink containing black charged particles, black and white mixed electrophoretic ink is electronic ink containing both black and white charged particles, and color electrophoretic ink is electronic ink containing both black and white charged particles. The electrophoretic ink is an electronic ink that contains charged particles of other colors in addition to black and white charged particles.

A second aspect of the present application provides a method for preparing a microcup display unit with a self-healing function, comprising the following steps:

Step 1, pressing the embossing embossing template sprayed with the release agent against the bottom transparent electrode covered with the self-repairing liquid, performing a first curing reaction, and demoulding to obtain a microcup located on the surface of the bottom transparent electrode;

Step 2, injecting the electronic ink into the microcup to obtain a microcup containing the electronic ink;

Step 3, attaching the top transparent electrode covered with the self-healing liquid to the microcup, performing a second curing reaction, and encapsulating to obtain a microcup display unit;

The self-repairing liquid is a transparent self-repairing liquid containing diisocyanate, disulfide or imine group;

Preferably, the transparent self-healing liquid is silicone or polyurethane self-healing liquid.

Preferably, the cross section of the microcup is square, circular or hexagonal.

Preferably, the first curing temperature is 60-100°C, and the time is 8-16h;

The second curing temperature is 20˜80° C., and the time is 3˜24 h.

Preferably, the self-healing liquid is a silicone self-healing liquid containing amino-terminated PDMS, hexamethylene diisocyanate and citric acid chloride;

The second curing temperature is 40°C and the time is 12h.

Preferably, the self-repairing liquid is a polyurethane self-repairing liquid containing tetrahydrofuran, hexamethylene diisocyanate and 5-(2-hydroxyethyl)-6-methyl-2-aminouracil;

The second curing temperature was 80° C. and the time was 3 hours.

Preferably, the self-repairing liquid is a polyurethane self-repairing liquid containing polytetramethylene ether glycol, hexamethylene diisocyanate and 4,4 diphenylmethane diisocyanate;

The second curing temperature is 20-30° C., and the time is 24 hours.

It should be noted that the microcup display unit is encapsulated by using a polyurethane self-repairing liquid containing polytetramethylene ether glycol, hexamethylene diisocyanate and 4,4 diphenylmethane diisocyanate to obtain a microcup display unit. The display unit is self-healing at room temperature.

A third aspect of the present application provides an application of a microcup display unit with a self-healing function as a display screen.

Preferably, the display screen is a flexible display screen.

Preferably, the display screen is a display screen of a mobile phone, a display screen of a computer, a display screen of a TV set or a display screen of an e-book reader.

To sum up, the present application provides a microcup display unit with self-healing function and a packaging method and application thereof. The microcup display unit includes: a bottom transparent electrode, a microcup, an electronic ink, an encapsulation layer and a top transparent electrode; Among them, the microcup containing the electronic ink is encapsulated by the encapsulation layer and is located between the bottom transparent electrode and the top transparent electrode. Since the microcup and the encapsulation layer are polyurethane elastomers containing diisocyanate, disulfide or imine groups and / or siloxane elastomer containing diisocyanate, disulfide or imine group, so strong and weak hydrogen bonds, disulfide bonds, etc. are formed between the microcup and the encapsulation layer. Valence bond and dynamic covalent bond, when the microcup display unit is impacted by external force, after the encapsulation layer and the microcup are damaged, no additional adhesive materials are needed, relying on strong and weak hydrogen bonds and disulfide bonds to make the broken bonds reconnect. Combined, the self-healing between the encapsulation layer and the microcup is completed, which solves the problem that after the microcup display unit is impacted by external force, the encapsulation layer and the microcup are damaged, resulting in leakage of electronic ink, resulting in the agglomeration of charged nano-color particles in the electronic ink, and the image display effect Attenuation technical issues.

Description of drawings

In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the specific embodiments or the prior art will be briefly introduced below. The drawings are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

1 is a schematic diagram of a microcup display unit provided in Embodiment 1 of the present application;

2 is a schematic diagram of the shape of a microcup in the microcup display unit provided by the application;

FIG. 3 is a schematic diagram of the preparation method of the microcup display unit provided in Examples 2-4 of the present application;

Wherein, the reference signs are: 1-electrode, 2-self-healing liquid, 3-embossing convex template, 4-electronic ink.

Detailed ways

The present application provides a microcup display unit with self-healing function and a packaging method and application thereof, which are used to solve the problem of leakage of electronic ink due to damage to the packaging layer and the microcup after the microcup display unit in the prior art is impacted by external force. The technical problem of causing the agglomeration of charged nano-color particles and the attenuation of the image display effect.

The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

Example 1

Example 1 of the present application provides a microcup display unit with a self-healing function, the structure of which is shown in FIG. 1 , wherein the microcup display unit includes a bottom transparent electrode ITO electrode, a silicone elastomer microcup, and a white electrophoretic ink. , siloxane elastomer encapsulation layer and top transparent electrode ITO electrode, wherein the height of the microcup is 20-40 microns, the thickness is 20-50 microns, the thickness of the encapsulation layer is 3-6 microns, the bottom transparent electrode and the top transparent electrode are The electrodes are all 4 cm long and 4 cm wide.

It should be noted that the material of the electrodes in the microcup display unit provided in this embodiment can also be PEDOT electrodes or other conductive transparent electrodes, and the material of the microcup and the encapsulation layer is not only a transparent material such as siloxane elastomer, but also a transparent material. It can be containing tetrahydrofuran, hexamethylene diisocyanate, 5-(2-hydroxyethyl)-6-methyl-2-aminouracil or containing polytetramethylene ether glycol, hexamethylene diisocyanate, 4,4 diphenylmethane diisocyanate polyurethane elastomer is a transparent material; the electronic ink can also be black electrophoretic ink, black and white mixed electrophoretic ink or color electrophoretic ink.

Example 2

Embodiment 2 of the present application provides a method for encapsulating a microcup display unit with a self-healing function, the process of which is shown in FIG. 3 , including steps:

Step 1. Clean two pieces of 4x4cm ITO glass with plasma, and then spin-coat the self-healing liquid with a thickness of 40 microns and 5 microns on the surfaces of the two pieces of 4x4cm ITO glass by spin coating method;

Step 2. Spray a little release agent on the prepared embossing template with a square column shape, then press on the surface of the ITO glass spin-coated with a thickness of 40 microns self-healing liquid prepared in step 1, and put it in an oven at 80°C for 8 hours. The first curing reaction, demoulding to obtain a microcup located on the surface of the bottom transparent electrode;

Step 3. Put the microcup on the surface of the bottom transparent electrode prepared in step 2 into an inkjet printer, and pour the prepared black and white electrophoretic ink into it to obtain a microcup containing the electronic ink;

Step 4. The ITO glass spin-coated with the self-healing liquid with a thickness of 5 microns prepared in Step 1 is attached to the microcup filled with black and white electrophoretic ink prepared in Step 3, and placed at 40° C. for 12 hours to complete the packaging.

Step 5. Carry out the drive test on the packaged sample, and it can be driven normally;

It should be noted that the spin coating process in this embodiment is 500r/30s, 2500r/30s, and the self-repairing liquid is PDMS self-repairing liquid, including: amino-terminated PDMS, hexamethylene diisocyanate, and citric acid chloride.

Example 3

Embodiment 3 of the present application provides a method for encapsulating a microcup display unit with a self-healing function, the process of which is shown in FIG. 3 , including steps:

Step 1. Clean two pieces of 4x4cm ITO glass with plasma, and then spin-coat the self-healing liquid with a thickness of 40 microns and 5 microns on the surfaces of the two pieces of 4x4cm ITO glass by spin coating method;

Step 2. Spray a little release agent on the prepared embossing template with a square column shape, then press on the surface of the ITO glass spin-coated with a thickness of 40 microns self-healing liquid prepared in step 1, and put it in an oven at 80°C for 8 hours. The first curing reaction, demoulding to obtain a microcup located on the surface of the bottom transparent electrode;

Step 3. Put the microcup on the surface of the bottom transparent electrode prepared in step 2 into an inkjet printer, and pour the prepared black and white electrophoretic ink into it to obtain a microcup containing the electronic ink;

Step 4. The ITO glass spin-coated with the self-healing liquid with a thickness of 5 microns prepared in Step 1 is attached to the microcup filled with black and white electrophoretic ink prepared in Step 3, and placed at 80° C. for 3 hours to complete the packaging.

It should be noted that in this embodiment, the spin coating process is 300r/30s, 2000r/40s, and the self-repairing liquid is a polyurethane self-repairing liquid, including: tetrahydrofuran, hexamethylene diisocyanate, 5-(2-hydroxyethyl )-6-methyl-2-aminouracil.

Example 4

Embodiment 4 of the present application provides a method for encapsulating a microcup display unit with a self-healing function, the process of which is shown in FIG. 3 , including steps:

Step 1. Clean two pieces of 4x4cm ITO glass with plasma, and then spin-coat the self-healing liquid with a thickness of 40 microns and 5 microns on the surfaces of the two pieces of 4x4cm ITO glass by spin coating method;

Step 2. Spray a little release agent on the prepared embossing template with a square column shape, then press it on the surface of the ITO glass spin-coated with a thickness of 40 microns self-healing liquid prepared in step 1, and put it in an oven at 90°C for 16h. The first curing reaction, demoulding to obtain a microcup located on the surface of the bottom transparent electrode;

Step 3. Put the microcup on the surface of the bottom transparent electrode prepared in step 2 into an inkjet printer, and pour the prepared black and white electrophoretic ink into it to obtain a microcup containing the electronic ink;

Step 4. The ITO glass spin-coated with the self-healing liquid with a thickness of 5 microns prepared in Step 1 is attached to the microcup filled with black and white electrophoretic ink prepared in Step 3, and placed at room temperature for 24 hours to complete the packaging.

It should be noted that in this embodiment, the spin coating process is 500r/30s, 2500r/40s, and the self-repairing liquid is a polyurethane self-repairing liquid, including: polytetramethylene ether glycol, hexamethylene diisocyanate, 4, 4 Diphenylmethane diisocyanate.

Example 5

This embodiment 5 is to perform performance test on the microcup display unit with self-healing function after encapsulation in embodiment 2-4, wherein the driving performance test results show that the microcup display unit after encapsulation in embodiment 2-4 can perform the performance test. It is normally driven and has high transmittance; at the same time, a self-healing performance test is also carried out. The results show that the microcup display units encapsulated in Examples 2-4 can be self-repaired, especially the microcup display unit provided in Example 3. , the self-repair can be completed after being placed at room temperature for a period of time, and the repaired microcup display unit has high hardness and excellent wear resistance.

The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the above-mentioned embodiments, those of ordinary skill in the art should understand that: it is still possible to implement the above-mentioned implementations. The technical solutions described in the examples are modified, or some or all of the technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A micro-cup display unit with a self-repairing function, comprising: the micro-cup comprises a bottom transparent electrode, a micro-cup, electronic ink, a packaging layer and a top transparent electrode;

the microcups are positioned on the surface of the bottom transparent electrode;

the micro-cup contains the electronic ink;

the encapsulation layer encapsulates the microcups;

the packaging layer is positioned on the surface of the top transparent electrode;

the material of the packaging layer is a transparent elastomer containing diisocyanate, disulfide or an imine group;

the material of the microcups is a transparent elastomer containing diisocyanate, disulfide or an imine group.

2. The self-repairing micro-cup display unit of claim 1, wherein the transparent elastomer is a silicone elastomer and/or a polyurethane elastomer.

3. The self-repairing micro-cup display unit of claim 1, wherein the bottom transparent electrode and the top transparent electrode are independently selected from PEDOT electrode, ITO electrode, IZO, MZO, carbon nanotube or nano silver.

4. The self-repairing micro-cup display unit as claimed in claim 1, wherein the electronic ink is selected from a white electrophoretic ink, a black-white electrophoretic ink, or a color electrophoretic ink.

5. The self-repairing microcup display unit of claim 1, wherein the microcups have a square, circular or hexagonal cross-section.

6. A packaging method of a micro-cup display unit with a self-repairing function is characterized by comprising the following steps:

step 1, pressing an imprinting convex template sprayed with a release agent against a bottom transparent electrode covered with self-repairing liquid, carrying out a first curing reaction, and demolding to obtain a microcup positioned on the surface of the bottom transparent electrode;

step 2, injecting the electronic ink into the micro-cup to obtain the micro-cup containing the electronic ink;

step 3, attaching the top transparent electrode covered with the self-repairing liquid to the microcups, carrying out a second curing reaction, and packaging to obtain a microcup display unit;

the self-repairing liquid is a transparent self-repairing liquid containing diisocyanate, disulfide or an imine group.

7. The method for encapsulating a microcup display unit with a self-repairing function according to claim 6, wherein the transparent self-repairing liquid is a polyurethane self-repairing liquid containing tetrahydrofuran, hexamethylene diisocyanate, 5- (2-hydroxyethyl) -6-methyl-2-aminouracil;

the second curing reaction temperature is 80 ℃, and the time is 3 hours.

8. The method for encapsulating the microcup display unit with the self-repairing function according to claim 6, wherein the transparent self-repairing liquid is a siloxane self-repairing liquid containing amino-terminated PDMS, hexamethylene diisocyanate and citracyl chloride;

the second curing temperature is 40 ℃ and the time is 12h.

9. The method for encapsulating the microcup display unit with the self-repairing function according to claim 6, wherein the transparent self-repairing liquid is a polyurethane self-repairing liquid containing polytetramethylene ether glycol, hexamethylene diisocyanate and 4,4 diphenylmethane diisocyanate;

the second curing temperature is 20-30 ℃ and the time is 24h.

10. Use of a self-repairing microcup display unit as claimed in any one of claims 1-5 or a self-repairing microcup display unit packaged by the packaging method as claimed in any one of claims 6-9 as a display screen.

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