CN212540971U

CN212540971U - Small-deformation cholesteric liquid crystal display device

Info

Publication number: CN212540971U
Application number: CN202021273627.1U
Authority: CN
Inventors: 赵景罡
Original assignee: Dalian Longning Technology Co ltd
Current assignee: Dalian Longning Technology Co ltd
Priority date: 2020-07-02
Filing date: 2020-07-02
Publication date: 2021-02-12
Anticipated expiration: 2030-07-02

Abstract

The utility model provides a little deformation cholesteric liquid crystal display device is applicable to the cholesteric liquid crystal display device of large screen, and display device includes: comprises upper and lower film substrates which are relatively parallel and a film which is attached to the inner surface of the film substrate and has patterning or non-patterning, wherein the film comprises but is not limited to an electrode film, an insulating film and an orientation film; the film substrate and/or the film are/is characterized in that a plurality of interval structures with high-strength cohesiveness are distributed between the upper film substrate and the lower film substrate, each interval structure at least comprises two connecting structures with concave-convex inlaying, and two ends of each interval structure are in contact with the inner surfaces of the film substrates and/or the films. The utility model discloses thereby can guarantee under the exogenic action cholesteric liquid crystal display device produces the stability that less deformation kept the display state, under the mode that grey level shows very much, can guarantee cholesteric liquid crystal display device's demonstration performance.

Description

Small-deformation cholesteric liquid crystal display device

Technical Field

The utility model relates to a cholesteric liquid crystal display technical field particularly, especially relates to a little deformation cholesteric liquid crystal display device.

Background

Color electronic paper display devices are a large category of display devices, which are different from tft (thin Film transistor) liquid crystal display devices and Organic Light Emitting Diode (OLED) display devices, and are expected to gradually occupy a place in the future. The remarkable characteristic is that the display content can be kept unchanged for a period of time even if no power supply is supplied.

The color electronic paper display device is being studied with a view to realizing a high color saturation, and the color electronic paper may be classified into an electrophoretic type, a cholesteric liquid crystal type, an electrowetting type, an electrophoretic/cholesteric liquid crystal hybrid type, and the like, according to a display mode. The electrophoresis type is a type of moving charged particles having different colors in a vacuum, a gas, or a liquid. The cholesteric liquid crystal type realizes color display by selectively reflecting light of different wavelengths by changing the arrangement form of cholesteric liquid crystal molecules. The electrowetting type is a type in which the wettability of a liquid droplet on a substrate, that is, a contact angle is changed by changing a voltage between the liquid droplet and an insulating substrate, and the liquid droplet is deformed or displaced. The color electronic paper adopting the electrophoresis/cholesteric liquid crystal mixing mode realizes the control of the reflection or absorption of light with a certain wavelength or a certain area wavelength and the control of the reflection or absorption of light with another area wavelength by cholesteric liquid crystal molecules with selective reflection characteristics by utilizing the characteristics of electrophoretic particles, and can also realize color display by simultaneously controlling the light with the same wavelength.

In the various modes of the color electronic paper, the advantages of the various display modes are different when the light with different wavelengths, particularly the gray scale, is displayed. The cholesteric liquid crystal type can regulate and control the reflection of one color or the transmission of light in the whole visible light spectrum region by liquid crystal molecules, so that color display can be realized by lamination, and the characteristic provides favorable conditions for adopting an electrophoresis/cholesteric liquid crystal mixing mode. Therefore, the electrophoretic/cholesteric liquid crystal hybrid system has an absolute advantage in color display in that advantages of various systems can be exhibited to the maximum extent as compared with other single systems such as the above-described electrophoretic system, cholesteric liquid crystal system, and electrowetting system. In the case of the single mode, the refresh rate, gray scale, and color saturation of the color display device are limited due to factors such as color filter transmittance, electrophoretic particle separation and mixing, electrowetting fluid coloring, and the like. Therefore, a display device that uses a single mode to realize colors faces a great obstacle to its color characteristics.

As described above, the electrophoretic/cholesteric liquid crystal system is advantageous in color performance of electronic paper, but it is not sufficient to realize only color display in color electronic paper including the cholesteric liquid crystal system. The reason for this is that the cholesteric liquid crystal is liquid, and when the cholesteric liquid crystal layer is deformed by being bent or pressed by an external force, the display state changes accordingly. The cholesteric liquid crystal flows due to the external force applied to the liquid crystal box, so that certain display states are changed, particularly when the display state in the focal conic state is pressed, the display state is completely converted into a planar state, the display state cannot be restored to the state before pressing until the display state is driven to refresh again, and otherwise, the display state cannot be restored.

How to improve the stable display performance of the color electronic paper containing cholesteric liquid crystal under the action of external force is a fundamental problem of the mixed color electronic paper, especially in the display state of a non-planar state. The cholesteric liquid crystal display mode requires a uniform liquid crystal layer having a thickness of several micrometers and a liquid crystal cell formed between upper and lower substrates. In order to form a uniform liquid crystal layer, the prior art is divided into several ways: (1) the spacer structure is formed using an organic or inorganic spherical or rod-shaped spacer material, typically using a dispersion method. (2) A ps (photospacer) material is used to form a spacer structure of a specific shape on a certain substrate through a series of processes by photolithography. The spacer structure is attached to a substrate at a constant density, but the conventional processing method cannot achieve stable cholesteric liquid crystal display performance.

The prior art alleviates the display performance change caused by the deformation generated by pressing through the following procedures, specifically: (1) and manufacturing an electrode pattern on the lower substrate. (2) A PS thin film is formed on the electrode pattern. (3) The PS film is exposed through a photomask. (4) And etching the exposed PS film by using a developing solution to form a spacing structure pattern. (5) And the upper substrate and the lower substrate are attached with preset patterns. (6) And (4) pressurizing and heating. (7) Vacuum liquid crystal injection and the like. In the processes (1) to (4), the tip portion of the spacer structure is made wider than the other portions of the spacer structure, and a part of the spacer structure is bonded to the electrode surface, thereby improving the adhesion between the spacer structure and the upper substrate. Therefore, the spacer structure can be reduced in lateral width, and the spacer structure can be prevented from being peeled off even in the developing process in the photolithography step.

The interval structure pattern has certain viscosity after the development, and the bonding of the upper substrate and the lower substrate can be realized through pressurization and heating treatment, so that the deformation of the display device is reduced. However, the above method has the following disadvantages: after the etching of the developing solution, the viscosity of the PS film is poor, and even the PS film is heated and pressurized, the contact area between the spacing structure and the substrate needs to keep a certain value, which is not beneficial to improving the resolution of the color electronic paper; the unstable chemical components in the spacer structure need to be removed by bonding synchronous heating or bonding first and then heating, otherwise the bonding property between the spacer structure and the substrate after development cannot be ensured. Furthermore, in such a process, the liquid crystal can be injected only through the liquid crystal injection port by vacuum injection. In the production process of the large-size color electronic paper, the production efficiency is low and the cost is high.

In view of the above, in order to apply cholesteric liquid crystals to color electronic paper, it is an important research subject to realize a cholesteric liquid crystal display device in which the display state does not change even if the electronic paper is pressed or bent, and it is very necessary to develop a new spacer structure to solve the problem of cholesteric liquid crystals in the application of color electronic paper.

SUMMERY OF THE UTILITY MODEL

According to the color electronic paper containing cholesteric liquid crystal, especially the color electronic paper with larger size is affected by the deformation of the cholesteric liquid crystal box in the display device, such as gray scale, resolution and the like, and a small deformation cholesteric liquid crystal display device and a manufacturing method thereof are provided. The utility model discloses mainly add the interval structure who has high strength cohesiveness between upper and lower film substrate, this interval structure comprises having unsmooth two parts structure of inlaying at least, cooperates sealed frame simultaneously, realizes the strong and high-efficient low-cost production of shock resistance, has little deformation and realizes the high resolution display of jumbo size colored electronic paper.

The utility model discloses a technical means as follows:

a small deformation cholesteric liquid crystal display device, the display device comprising: comprises relatively parallel upper and lower thin film substrates and a patterned or non-patterned thin film attached to the inner surface of the thin film substrate, wherein the thin film includes but is not limited to an electrode thin film, an insulating film, an orientation film and the like; it is characterized in that the preparation method is characterized in that,

a plurality of interval structures with high-strength cohesiveness are distributed between the upper film substrate and the lower film substrate, each interval structure at least comprises two connecting structures with concave-convex embedded structures, and two ends of each interval structure are in contact with the inner surfaces of the film substrates and/or the films.

The electrode films mentioned above are in a rectangular strip shape in practical application, the distance between the electrode films is usually less than 50 μm, the electrode films are of a type in which a transparent electrode is disposed in the display region, and the lead electrode connecting the pixel electrode and the driving IC may be formed of a lead electrode with low sheet resistance or a lead electrode with a transparent ITO electrode. The overlapping area is specifically set according to the wiring structure of the display device, an insulating film such as silicon oxide or silicon nitride can be arranged in the middle, and via holes are arranged on the insulating film to connect all parts of the electrode films.

The alignment film is usually disposed over the entire effective display area, also called AA (active area), and does not require a fine patterning process for each display device, but only covers the entire AA area and does not exceed the sealing frame. In the lead electrode or the blank region in the AA region, an alignment film is also generally provided. In the manufacture of liquid crystal, the adjustment of working procedures is very difficult, and the simplification process is difficult and expensive on the premise of not influencing the display performance. In order to adapt to the process flow of the production line, a cholesteric liquid crystal display device with a single-side orientation film can also be arranged, and a layer of protective film is arranged on the surface of an electrode film on the other side without the orientation film, so that the electrodes, particularly metal electrodes, are prevented from slowly seeping to pollute the display liquid crystal material, and the display stability is influenced by conductive impurities in the liquid crystal display material. The insulating film is patterned in a manner similar to that of the alignment film.

When the material of the spacer structure is in contact with the alignment film or the insulating film, good stability and film formation characteristics are required. The sealing frame portion of the sealing structure is in contact with ITO or a metal electrode, and is also required to have good stability and film forming characteristics.

Further, the spacing structure is composed of a connecting structure I and a connecting structure II which are embedded in a concave-convex mode, at least one side end portion of the connecting structure I is in contact with the inner surface of the upper (or lower) film substrate and/or the film and has a completely or partially hollow outer side structure, the connecting structure II is a solid structure embedded in the connecting structure I, and at least one side end portion of the connecting structure II is in contact with the inner surface of the lower (or upper) film substrate and/or the film.

Furthermore, the connecting structure II is embedded in the connecting structure I, and one side end of the connecting structure II is provided with an extension part wrapping the outer side structure.

Further, one or a plurality of hollow parts can be arranged in the outer side structure according to requirements, and a columnar or other filling structure can be arranged in the hollow parts.

The convex-concave mosaic connecting structure has the advantages that: the two structures are respectively connected with the upper film substrate and the lower film substrate, the material of one structure can be fixed on one film substrate in a patterning mode, and the patterning material is not required to have the adhesion property to the other film substrate in the processing process, namely, the material has the adhesion property to one film substrate. Before the two film substrates are attached, the requirement on another resin bonding material is that the liquid crystal material is kept stable and is not easy to diffuse into liquid crystal, so that cholesteric liquid crystal is dripped before the attaching process and then attached, the cholesteric liquid crystal injection time and the sealing process are saved, the production efficiency of the liquid crystal panel is improved, and the production cost is reduced.

Further, along the normal direction of the film substrate, the two ends of the spacer structure have tight connectivity with at least all or part of the contact surfaces of the upper and lower film substrates, the electrode films, the insulating films or the orientation films, and the two ends of the spacer structure refer to the end surfaces of the two ends or the side wall portions of the end portions. Both ends of the spacer structure in the normal direction of the film substrate may be in contact with the ITO electrode, the insulating film, and the alignment film, and must be in firm contact with the surface of the medium to satisfy the requirement of small deformation of the cholesteric liquid crystal layer. The spacer structure has long term stable performance in cholesteric liquid crystals.

Further, the thickness of the upper and lower thin film substrates is less than 200 μm; the projections of different films on the normal direction of the upper film substrate and the lower film substrate are partially overlapped or completely overlapped; the height of the spacing structure is between 2 and 5 mu m.

The utility model discloses a display device, film substrate thickness will be less than 200 mu m, and film substrate thickness is thinner the more easily the impulse is absorbed by interval structure when the exogenic action, and cholesteric liquid crystal layer produces deformation and is smaller. The size of the spacing structure is limited by the resolution size of the display, and the spacing structure cannot be designed at will, and only the structures at two ends can be optimized to meet the performance requirement of the display device. The thinner the film substrate is, the higher the flexibility is, the lower the elasticity is, and the easier the interval structure restrains the deformation of the film substrate. Small deformation cells can be formed as long as the density is high enough, very small (a few microns or tens of microns) spacer structures. Meanwhile, in the laminated color electronic paper display device, the thinner the substrate is, the more favorable the color mixing effect is, and the material of the film substrate may be a transparent material such as plastic or glass.

Furthermore, an auxiliary spacing structure for assisting in adjusting the supporting force between the film substrates is arranged between the upper film substrate and the lower film substrate, and the total cross-sectional area of the auxiliary spacing structure is not more than 5% of the effective display area.

The height of the auxiliary spacing structure is 2-5 μm, the area of the solid structure is as small as possible, and the solid structure is required to have relatively high supporting capacity. In the operating temperature range of the display device, the elastic modulus is required to be in the range of 0.1-1GPa at a compression amount of about 15%.

Further, the electrode thin film is transparent or non-transparent, and the orientation film is arranged on the outermost layer of each thin film on the inner side of the upper thin film substrate and/or the lower thin film substrate.

The electrode film has two kinds of transparency and opacity, the opaque electrode is usually a metal electrode, can be copper, molybdenum, aluminum, chromium or each layer is superposed, and the lamination structure of molybdenum, aluminum and molybdenum is preferably used in the aspect of cost and stability; the transparent electrode is usually a metal oxide electrode such as tin or indium, and preferably an ITO electrode. In flexible display, it is preferable to use a material such as a silver nanowire, graphene, PEDOT/PSS (poly 3, 4-ethylenedioxythiophene/polystyrenesulfonic acid) or the like for the transparent electrode. The transparent electrode film can be used for the display electrode part and can also be superposed with the metal electrode for the non-display electrode part, and the higher the resolution ratio is, the smaller the electrode distance is required to be.

The alignment film may be provided only on the upper film substrate side or only on the lower film substrate side. The orientation film is in direct contact with the cholesteric liquid crystal layer, and increases the degree of order of the cholesteric liquid crystal during the anchoring process of the liquid crystal, and a homeotropic orientation film is preferable. In the formation of each layer of thin film, bm (black matrix), oc (over coat) layer, electrode thin film and insulating film are first patterned, and the thin film required for patterning, orientation film coating and spacer formation are sputtered or evaporated, and may be formed in this order. After each layer of thin film is formed, corresponding patterning treatment is performed as required. But in the process flow of current production line, often the process flow is different, and the cost of resetting the process flow is high, the utility model discloses can use the individual layer orientation membrane to practice thrift manufacturing cost.

The utility model discloses in, the orientation membrane can be after the structure forms in the outside, and the preparation orientation membrane of recoating, this process are favorable to the outside structure to process in different workshops. The prior art requires that the alignment film be processed prior to all parts of the spacer structure, which would otherwise affect the adhesion properties of the spacer structure. The utility model discloses even coating the orientation film again after the structure forms in the outside can not influence the cohesiveness of interval structure yet, this is also the utility model discloses the advantage part compared with prior art.

Furthermore, the display device also comprises a sealing frame arranged between the upper film substrate and the lower film substrate, and the sealing frame seals the cholesteric liquid crystal in the closed space after the cholesteric liquid crystal forms a uniform liquid crystal layer according to the thickness of the interval structure.

Furthermore, the sealing frame at least comprises an inner frame and an outer frame with certain cohesiveness, and also comprises a frame spacing structure arranged between the inner frame and the outer frame; the frame spacing structure is a small cylindrical or other solid structure.

Compared with the prior art, the utility model discloses a thereby cholesteric liquid crystal display device produces less deformation and keeps the stability of demonstration state under the exogenic action can be guaranteed in the setting of interval structure, especially under the mode that grey level shows, can guarantee cholesteric liquid crystal display device's display performance. Meanwhile, the spacing structure is matched with the sealing frame, the mode of firstly dripping cholesteric liquid crystal materials can be adopted for lamination, liquid crystal is dripped in advance before the two film substrates are laminated, and then a box is formed, so that the liquid crystal display device is suitable for a large-screen cholesteric liquid crystal display device.

The utility model is suitable for a high resolution shows the requirement, has the high resolution that little deformation realized jumbo size colored electronic paper and shows, can high-efficient low-cost production to shock resistance is strong.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic structural diagram of a small deformation cholesteric liquid crystal display device according to the present invention.

Fig. 2 is a schematic structural diagram of the small-deformation cholesteric liquid crystal display device of the present invention in which the spacer structure and the outer structure of the sealing frame are bonded to the single-sided film substrate.

FIG. 3 is a schematic cross-sectional view (B-B) of the connection structure I of the present invention having a completely hollow structure^|)。

FIG. 4 is a schematic cross-sectional view (B-B) of the connection structure I of the present invention having a partially hollow structure (U-shaped structure)^|)。

FIG. 5 is a schematic cross-sectional view (B-B) of the connection structure I of the present invention having a solid structure^|)。

FIG. 6 is a schematic cross-sectional view (B-B) of the connection structure I of the present invention having a partially hollow structure (U-shaped structure) and one or more hollow portions provided therein^|)。

Fig. 7 is a schematic cross-sectional view of the connection structure i and the connection structure ii shown in fig. 3 after curing between the upper and lower film substrates according to the present invention.

Fig. 8 is a schematic cross-sectional view of the connection structure i and the connection structure ii shown in fig. 4 after curing between the upper and lower film substrates according to the present invention.

Fig. 9 is a schematic cross-sectional view of the connection structure i and the connection structure ii shown in fig. 5 after curing between the upper and lower film substrates according to the present invention.

Fig. 10 is a schematic view of the inner and outer frames and the frame spacing structure of the sealing frame according to the present invention.

In the figure: 1. an upper thin film substrate; 2. a lower film substrate; 3. a patterned or unpatterned film attached to the upper substrate; 4. a patterned or unpatterned film attached to the lower substrate; 5. sealing the frame; 6. a spacer structure; 7. cholesteric liquid crystal; 8. a connecting structure I; 10. a connecting structure II; 11. an inner frame; 12. an outer frame; 13. and a frame interval structure.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element in question must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.

As shown in fig. 1 and fig. 2, the utility model provides a little deformation cholesteric liquid crystal display device, display device includes: comprises an upper film substrate 1, a lower film substrate 2, a patterned or non-patterned film 3 attached to the upper substrate, a patterned or non-patterned film 4 attached to the lower substrate, which include but are not limited to electrode films, insulating films, and orientation films, etc. The electrode thin film is transparent or non-transparent, and the orientation film is arranged on the outermost layer of each thin film on the inner side of the upper thin film substrate 1 and/or the lower thin film substrate 2.

A plurality of spacing structures 6 with high-strength cohesiveness are distributed between the upper film substrate 1 and the lower film substrate 2, and the spacing structures can be uniformly distributed between the film substrates and also can be arranged according to actual needs. The spacing structure 6 is at least composed of two connecting structures with concave-convex embedded structures, and two ends of the spacing structure 6 are in contact with the inner surface of the film substrate and/or the film, namely two ends of the spacing structure 6 can be in contact with the inner surface of the film substrate at the same time, can also be in contact with the inner surface of the film at the same time, or one side of the spacing structure is in contact with one side of the film substrate. Along the normal direction of the film substrate, the two ends of the spacing structure 6 at least have close connectivity with all or part of the contact surfaces of the upper and lower film substrates, the electrode film, the insulating film or the orientation film, the two ends of the spacing structure 6 refer to the end surfaces of the two ends or the side wall parts of the end parts, and because of the multi-layer overlapping of the films, there will be close connectivity in the microstructure.

Preferably, the thickness of the upper and lower film substrates is less than 200 μm; the projections of different films on the normal direction of the upper film substrate and the lower film substrate are partially overlapped or completely overlapped; the height of the spacer structures 6 is between 2 and 5 μm.

Specifically, the spacing structure 6 is composed of a connecting structure i 8 and a connecting structure ii 10 which are inlaid in a concave-convex manner, at least one side end of the connecting structure i 8 is in contact with the inner surface of the upper (or lower) film substrate and/or the film and has a completely or partially hollow outer side structure, that is, the connecting structure i 8 may be as shown in the figure, and is a completely hollow structure, that is, the outer side structure is represented by a ring-shaped column, and the cross section of the outer side structure may be an inverted trapezoid, a rectangle or other shapes, and is not limited herein; the connection structure i 8 may also be a partially hollow structure as shown in fig. 4, which shows a U-shaped structure, and the bottom of the U-shaped structure is completely in contact with the lower film substrate 2 and/or the patterned or unpatterned film 4 attached to the lower substrate, where and/or because the film structure has a patterned or unpatterned structure as required, when the hollowed-out regions of the multi-layer pattern overlap, there is always a direct contact with the film substrate. Further, as shown in FIG. 5, the connecting structure I8 may be a solid structure, without a hollow portion.

As shown in fig. 7 to 9, the connection structure ii 10 is a solid structure embedded in the connection structure i, and at least one side end of the connection structure ii 10 is in contact with the inner surface of the lower (or upper) thin film substrate and/or the thin film, fig. 7 shows that two ends of the connection structure ii 10 are in contact with the upper and lower thin film substrates, respectively, and fig. 9 shows that one side end is in contact with the upper thin film substrate 1 and/or the patterned or unpatterned thin film 3 attached to the upper substrate.

As can be seen from the figure, the connecting structure II 10 is embedded in or on the connecting structure I8, and one side end of the connecting structure II 10 is provided with an extension part wrapping the outer side structure, namely the upper end of the connecting structure II 10 is wrapped on the upper end of the connecting structure I8 in an extending mode, so that the connecting structure II is more tightly combined.

Preferably, the inside of the outer side structure (connecting structure i 8) can be provided with one or more hollow parts according to the requirement, and the inside of the hollow part can be provided with a columnar or other-shaped filling structure, namely, a small hollow structure is further arranged in the hollow part in fig. 3 or fig. 4, as shown in fig. 6.

In the actual manufacturing process, the spacing structure 6 is formed by respectively and correspondingly processing two types of resin mixtures with different characteristics, and the two types of cured resin mixtures form a connecting structure with concave-convex inlaying at the connecting position. In the connection structure I8, a resin material (usually photoresist, PSA025 available from Daxing materials, Inc.) is used to have patterning characteristics, and the connection structure can be patterned in various ways, such as APR printing, gravure printing, screen printing, ink jet printing, photolithography, and the like. In consideration of process maturity and pattern fineness, a preferred scheme of the high-resolution color electronic paper manufacturing process is photolithography, and the formed resin pattern is not easily peeled off. The connecting structure II 10 adopts another resin material which is glue with ultraviolet heat-setting performance, and the requirements are as follows: (1) it is difficult for the liquid crystal display material to diffuse and precipitate before being cured; (2) easy positioning in forming the pattern is enough, and the preferable scheme is ink-jet printing; (3) the adhesive has good adhesion to various films, and the commercially available triple bond chemical TB3025B is usually selected, so long as the cured adhesive can form a concave-convex mosaic structure.

As another preferable scheme, an auxiliary spacing structure for assisting in adjusting the supporting force between the film substrates is further arranged between the upper film substrate and the lower film substrate, the material of the auxiliary spacing structure is the same as that of the connecting structure i, and the total cross-sectional area of the auxiliary spacing structure is not more than 5% of the effective display area.

In cooperation with the spacer structure 6, as another preferred embodiment, as shown in fig. 2, the display device further includes a sealing frame 5 disposed between the upper and lower film substrates, the sealing frame 5 forms a uniform liquid crystal layer on the cholesteric liquid crystal 7 according to the thickness of the spacer structure 6 and then seals the liquid crystal layer in the enclosed space, the enclosed space is a space surrounded by the sealing frame 5 disposed on the upper film substrate 1 or the lower film substrate 2, and the cholesteric liquid crystal 7 is stable and does not leak in this area. The specific arrangement of the sealing rim 5 is shown in fig. 10.

Preferably, the sealing frame 5 at least comprises an inner frame 11 and an outer frame 12 with certain cohesiveness, and further comprises a frame spacing structure 13 arranged between the inner frame and the outer frame; the frame spacing structure 13 is a small cylindrical, or other shaped solid structure.

The utility model discloses can make through following method, include following step:

s1, cleaning: cleaning an upper film substrate 1, a lower film substrate 2, a patterned or non-patterned film 3 attached to the upper substrate, and a patterned or non-patterned film 4 attached to the lower substrate;

s2, preparing a spacing structure: selecting a lower film substrate 2, coating a photoresist (commercially available PSA025) mixture on the inner surface of the film substrate by using spin and slit methods, and forming a connecting structure I8 by pre-curing, exposing, developing by using an alkaline solution, cleaning and curing;

in step S2, preparing the inner frame and the outer frame of the sealing frame 5 by the same method while preparing the connection structure i 8;

the material (commercially available TB3025B) of the connection structure ii 10 was filled in the connection structure i 8 by a printing method or an inkjet printing method, and the solvent in the paste was evaporated by heating to obtain a connection structure ii 10; at the same time, the glue may be filled into the sealing rim 5 to obtain the rim spacing structure 13.

S3, filling and preparing a cholesteric liquid crystal layer: filling the cholesteric liquid crystal 7 into the space surrounded by the sealing frame by using a dripping method; after the liquid crystal is instilled, the upper film substrate 1 is attached, and a liquid crystal box is pressed by using proper atmospheric pressure to form a uniform liquid crystal layer;

s4, curing and packaging: and carrying out photocuring on the liquid crystal box, and then carrying out thermocuring to obtain the small-deformation cholesteric liquid crystal display device.

As shown in fig. 7, the solid structure wraps around and makes up-and-down contact with the partially solid outer structure. The spacing structure 6 of the attached upper and lower film substrates is in close contact with the upper film substrate 1 and the lower film substrate 2. The solidification and bonding of the spacing structure 6 and the film substrate are realized in two steps, and the bonding firmness is ensured. Meanwhile, cholesteric liquid crystal 7 can be injected in the curing process, the existing vacuum injection technology is avoided, the production efficiency is improved, and the cost is reduced.

The utility model provides a cholesteric liquid crystal display device of little deformation is pressing, under the exogenic action of bending or other forms, and the planar state, the burnt cone state, the grey scale state of cholesteric liquid crystal all do not change, satisfy the needs of demonstration forms such as handwriting input, flexible display.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; the adjustment of the display device by changing the thickness of the film substrate, the density and height of the spacing structure, the proportion of the materials and the like is covered in the protection scope of the utility model; the utility model discloses according to the fixed order and the mode of interval structure and film substrate, produce little deformation cholesteric liquid crystal display device, any change to the material kind, the proportion of outside structure and solid structure, known processing method all is the optimization mode of thinking easily. Although the present invention is designed according to the requirements of the small deformation cholesteric liquid crystal display device, it will bring obvious benefits to other types of liquid crystal display devices, for example, when the display device is bent, the display content is kept unchanged. Those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A small deformation cholesteric liquid crystal display device, the display device comprising: the film comprises an upper film substrate, a lower film substrate and a film which is attached to the inner surface of the film substrate and has patterning or non-patterning, wherein the film comprises an electrode film, an insulating film and an orientation film; it is characterized in that the preparation method is characterized in that,

2. A small deformation cholesteric liquid crystal display device according to claim 1, wherein the spacer structure is composed of a connection structure i and a connection structure ii which are embedded in a concavo-convex manner, at least one side end of the connection structure i is in contact with an inner surface of the upper or lower film substrate and/or the film and has a completely or partially hollow outer side structure, the connection structure ii is a solid structure embedded in the connection structure i and at least one side end of the connection structure ii is in contact with an inner surface of the lower or upper film substrate and/or the film.

3. Small deformation cholesteric liquid crystal display device according to claim 2, wherein the connection structure II is embedded in the connection structure I, and one side end portion thereof has an extension portion wrapping the outer side structure.

4. Small deformation cholesteric liquid crystal display device according to claim 2, wherein one or more hollow parts are arranged inside the outer structure according to the requirement, and a columnar filling structure can be arranged inside the hollow parts.

5. A small deformation cholesteric liquid crystal display device according to claim 1, wherein both ends of the spacer structure are in close contact with at least all or part of the contact surfaces of the upper and lower film substrates, the electrode films, the insulating films, or the alignment films in a normal direction of the film substrates, and both ends of the spacer structure are end surfaces of both ends or side wall portions of the end portions.

6. A small deformation cholesteric liquid crystal display device according to claim 1, wherein the upper and lower film substrates have a thickness of less than 200 μm; the projections of different films on the normal direction of the upper film substrate and the lower film substrate are partially overlapped or completely overlapped; the height of the spacing structure is between 2 and 5 mu m.

7. A small deformation cholesteric liquid crystal display device according to claim 1, wherein an auxiliary spacer structure for assisting in adjusting a supporting force between the film substrates is further disposed between the upper and lower film substrates, and an overall cross-sectional area of the auxiliary spacer structure is not more than 5% of an effective display area.

8. A small deformation cholesteric liquid crystal display device according to claim 1, wherein the electrode film is transparent or opaque, and the alignment film is provided on an outermost layer of each film inside the upper film substrate and/or the lower film substrate.

9. A small deformation cholesteric liquid crystal display device according to claim 1, further comprising a sealing frame disposed between the upper and lower film substrates, wherein the sealing frame seals the cholesteric liquid crystal in the enclosed space after forming a uniform liquid crystal layer according to the thickness of the spacer structure.

10. A small form factor cholesteric liquid crystal display device according to claim 9, wherein the sealing frame comprises at least an inner frame and an outer frame having a certain adhesiveness, and further comprises a frame spacer structure disposed between the inner and outer frames.