A flexible LCD structure

Abstract

This utility model discloses a flexible LCD structure. The flexible substrate adopts a sandwich structure of a double-layer TAC thin film layer sandwiching a PVA polarizing film. By introducing the PVA polarizing film into the flexible substrate, the overall thickness of the flexible LCD structure is reduced to less than 0.25mm, thus reducing the thickness of the product. The nano-silver film is printed on the flexible substrate by relief printing, which does not require etching, reduces acid and alkali emissions, and has lower resistivity. The spacers are coated on the first PI layer by photolithography, so they will not move when bent. The spacing in the first region at the center is small, while the spacing in the second regions on both sides is large, which strengthens the bending support force in the center of the flexible LCD when bent. In the center region with high stress, the spacing distance is reduced and the density of the spacers 7 is increased, ensuring the uniformity of cell thickness under bending.

Description

Technical Field

[0001] This utility model relates to the field of display technology, and in particular to a flexible LCD structure. Background Technology

[0002] The description in this section provides only background information related to the disclosure of this utility model and does not constitute prior art.

[0003] Existing flexible passive LCDs (Liquid Crystal Displays) typically use an ITO flexible substrate and are obtained through the normal process of PI coating, powder spraying, screen printing into cells, liquid crystal filling, and sealing. This structure has the following problems: it requires a secondary attachment of a polarizer, increasing the complexity of the process; the internal spacer powder is easily moved by the liquid crystal flow when the finished product is bent, causing uneven cell thickness; the powder scatters light, affecting the blackness when it is opaque; and the junction of the sealing adhesive and the frame adhesive at the liquid crystal filling port is prone to stress and cracking when bent, causing the flexible LCD to leak.

[0004] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this utility model and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this utility model. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a flexible LCD structure to address the shortcomings of the existing technology.

[0006] This application discloses a flexible LCD structure, including:

[0007] A first flexible substrate and a second flexible substrate, wherein the first flexible substrate includes a first TAC thin film layer, a first PVA polarizing film layer and a second TAC thin film layer arranged sequentially from top to bottom, and the second flexible substrate includes a third TAC thin film layer, a second PVA polarizing film layer and a fourth TAC thin film layer arranged sequentially from top to bottom;

[0008] A first nano-silver film layer and a second nano-silver film layer are formed. The first nano-silver film layer is formed on the second TAC film layer by letterpress printing, and a PI layer is formed on the other side of the nano-silver film. The second nano-silver film layer is formed on the third TAC film layer by letterpress printing.

[0009] A first PI layer and a second PI layer, wherein the first PI layer is disposed on the side of the first silver nanofilm layer opposite to the second TAC film layer, and the second PI layer is disposed on the side of the second silver nanofilm layer opposite to the third TAC film layer.

[0010] A plurality of spacer pillars, one side of which is coated on the first PI layer with negative photoresist, and the other side of which abuts against the second PI layer;

[0011] A frame adhesive is disposed between the second and third TAC film layers, and the frame adhesive is bonded to the outer wall of the first and second nano-silver film layers.

[0012] Furthermore, in the aforementioned flexible LCD structure, the thickness of the first PVA polarizing film layer and the second PVA polarizing film layer is 20μm-30μm, and the thickness of the first TAC thin film layer, the second TAC thin film layer, the third TAC thin film layer and the fourth TAC thin film layer are all 25μm-60μm.

[0013] Furthermore, in the aforementioned flexible LCD structure, the spacer pillars contain 5%-10% anthraquinone-based black dye negative photoresist.

[0014] Furthermore, in the aforementioned flexible LCD structure, the spacers are divided along the length of the first flexible substrate into a first region at the center 1 / 3 of the area and a second region at each side 1 / 3 of the area of ​​the first region. The spacing between adjacent spacers in the first region is 50μm-70μm, and the spacing between adjacent spacers in the second region is 100μm-120μm.

[0015] Furthermore, in the aforementioned flexible LCD structure, the diameter of the spacer pillars is 4μm-6μm.

[0016] Furthermore, in the aforementioned flexible LCD structure, the frame adhesive is made of flexible resin adhesive.

[0017] In summary, the structure adopted in this embodiment of the present invention has the following advantages:

[0018] 1. The flexible LCD structure described in this utility model adopts a sandwich structure of double-layer TAC thin film layer sandwiching PVA polarizing film. The TAC is TAC with hydrolysis resistant groups. At the same time, it is modified by adding ultraviolet absorbers UV312 and UV342 to introduce PVA polarizing film into the flexible substrate. The overall thickness of the flexible LCD structure is reduced to less than 0.25mm, thus reducing the thickness of the product.

[0019] 2. Nano silver thin film replaces traditional ITO and is printed on flexible substrates using letterpress printing. It does not require etching, reduces acid and alkali emissions, and has lower resistivity. For the same thickness, the sheet resistance is reduced by 90% compared to ITO, and the wiring design is more convenient.

[0020] 3. The spacers are coated on the first PI layer by photolithography. They will not move when bent. The first region in the center has a small spacing, while the second region on both sides has a large spacing, which strengthens the bending support force in the center of the flexible LCD when it is bent. In the center region with high stress, the spacing distance is reduced to increase the density of the spacers 7, which ensures the uniformity of cell thickness under bending. Adding 5%-10% of anthraquinone black dye negative photoresist that is not sensitive to deep ultraviolet light can make the absorption rate of visible light of the spacers greater than 99.9%, which greatly reduces the diffuse reflection of light by the spacers, improves the blackness in the black state, and thus improves the contrast of the product.

[0021] 4. The frame adhesive is a flexible resin adhesive with an integrated frame adhesive design without a filling port. This avoids the weak point at the junction of the frame adhesive and the sealing adhesive at the filling port of flexible LCDs with liquid crystal filling ports, achieving overall encapsulation and improving the reliability of the flexible LCD structure when bent.

[0022] To further understand the features and technical content of this utility model, please refer to the following detailed description and drawings of this utility model. However, the drawings provided are for reference and illustration only and are not intended to limit this utility model. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments or prior art of this specification, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a cross-sectional schematic diagram of the flexible LCD structure in an embodiment of this utility model;

[0025] Figure 2 This is a schematic diagram of the distribution of spacer columns in an embodiment of this utility model.

[0026] The reference numerals in the above figures are as follows: 1. First flexible substrate; 11. First TAC thin film layer; 12. First PVA polarizing film layer; 13. Second TAC thin film layer; 2. Second flexible substrate; 21. Third TAC thin film layer; 22. Second PVA polarizing film layer; 23. Fourth TAC thin film layer; 3. First nano-silver thin film layer; 4. Second nano-silver thin film layer; 5. First PI layer; 6. First PI layer; 7. Spacer; 71. First region; 72. Second region; 8. Frame adhesive. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this specification.

[0028] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can understand the advantages and effects of this utility model from the content disclosed in this specification. This utility model can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of this utility model. Furthermore, the accompanying drawings of this utility model are for simple illustration only and are not depictions of actual dimensions, as stated in advance. The following embodiments will further describe the relevant technical content of this utility model in detail, but the disclosed content is not intended to limit the scope of protection of this utility model.

[0029] It should be understood that while terms such as "first," "second," and "third" may be used in this document to describe various components or signals, these components or signals should not be limited by these terms. These terms are primarily used to distinguish one component from another, or one signal from another. Furthermore, the term "or" as used herein should, as appropriate, include any combination of one or more of the related listed items.

[0030] Reference Figures 1 to 2 As shown in the figure, this application discloses a flexible LCD structure, including:

[0031] A first flexible substrate 1 and a second flexible substrate 2, wherein the first flexible substrate 1 includes a first TAC thin film layer 11, a first PVA polarizing film layer 12 and a second TAC thin film layer 13 arranged sequentially from top to bottom, and the second flexible substrate 2 includes a third TAC thin film layer 21, a second PVA polarizing film layer 22 and a fourth TAC thin film layer 23 arranged sequentially from top to bottom.

[0032] The first nano silver film layer 3 and the second nano silver film layer 4 are provided on the second TAC film layer 13 by letterpress printing, and the other side of the nano silver film is provided with a PI layer. The second nano silver film layer 4 is provided on the third TAC film layer 21 by letterpress printing.

[0033] The first PI layer 5 and the second PI layer 6 are disposed on the side of the first nano silver film layer 3 away from the second TAC film layer 13, and the second PI layer 6 is disposed on the side of the second nano silver film layer 4 away from the third TAC film layer 21.

[0034] A plurality of spacer pillars 7, one side of which is coated on the first PI layer 5 with negative photoresist, and the other side of which abuts against the second PI layer 6;

[0035] A frame adhesive 8 is disposed between the second TAC thin film layer 13 and the third TAC thin film layer 21, and the frame adhesive 8 is bonded to the outer wall of the first nano-silver thin film layer 3 and the second nano-silver thin film layer 4. In an LCD, the PI layer is mainly composed of polyimide, and its function is to orient the liquid crystal molecules.

[0036] Specifically, in this embodiment, the thickness of the first PVA polarizing film layer 12 and the second PVA polarizing film layer 22 is 20μm-30μm, and the thickness of the first TAC thin film layer 11, the second TAC thin film layer 13, the third TAC thin film layer 21, and the fourth TAC thin film layer 23 is 25μm-60μm. By incorporating the PVA polarizing film into the flexible substrate, the overall thickness of the flexible LCD structure is reduced to below 0.25mm, thus reducing the product's thickness.

[0037] Specifically, in this embodiment, the spacer column 7 contains 5%-10% anthraquinone-based black dye negative photoresist. Adding 5%-10% of anthraquinone-based black dye negative photoresist, which is insensitive to deep ultraviolet light, allows the spacer column 7 to absorb visible light at a rate exceeding 99.9%, significantly reducing diffuse reflection of light by the spacer, improving blackness in the black state, and thus enhancing the product's contrast.

[0038] Specifically, in this embodiment, the spacer pillars 7 are divided along the length of the first flexible substrate 1 into a first region 71 located at the center 1 / 3 of the area and a second region 72 located at each of the two sides of the first region 71 at the center 1 / 3 of the area. The spacing between adjacent spacer pillars 7 in the first region 71 is 50μm-70μm, and the spacing between adjacent spacer pillars 7 in the second region 72 is 100μm-120μm. The spacing between adjacent spacer pillars 7 in the first region 71 is small, while the spacing between adjacent spacer pillars 72 is large. This strengthens the bending support force at the center of the flexible LCD structure when it is bent. In the center region with high stress, the spacing distance is reduced to increase the density of the spacer pillars 7, thus ensuring the uniformity of cell thickness under bending.

[0039] Specifically, in this embodiment, the diameter of the spacer column 7 is 4μm-6μm.

[0040] Specifically, in this embodiment, the frame adhesive 8 is a flexible resin adhesive.

[0041] Using the above structure, the flexible substrate assembly adopts a sandwich structure of a double-layer TAC (triacetyl cellulose) film layer sandwiching a PVA (polyvinyl alcohol) polarizing film (stretched and immersed in iodine solution). The TAC is a TAC with hydrolysis-resistant groups, and it is modified by adding ultraviolet absorbers UV312 and UV342 to introduce the PVA polarizing film into the flexible substrate. The overall thickness of the flexible LCD structure is reduced to below 0.25mm, thus reducing the product thickness. The nano-silver film replaces the traditional ITO and is printed on the flexible substrate assembly using letterpress printing, eliminating the need for etching, reducing acid and alkali emissions, and resulting in lower resistivity. For the same thickness, the sheet resistance is reduced by 90% compared to ITO, making the wiring design more convenient. The spacer pillars 7 are coated on the first PI layer 5 through photolithography, and they will not move when bent, remaining in the middle. The small spacing in the first region 71 and the large spacing in the second regions 72 on both sides strengthen the bending support force in the center of the flexible LCD when it is bent. In the center region with high stress, the spacing distance is reduced and the density of the spacer pillars 7 is increased, ensuring the uniformity of cell thickness under bending. The addition of 5%-10% of anthraquinone black dye negative photoresist that is not sensitive to deep ultraviolet light can make the absorption rate of visible light of the spacer pillars 7 greater than 99.9%, which greatly reduces the diffuse reflection of light by the spacer and improves the blackness in the black state, thereby improving the contrast of the product. In addition, the frame adhesive 8 is a flexible resin adhesive. The integrated frame adhesive 8 design without a filling port avoids the weak point at the junction of the frame adhesive 8 and the sealing adhesive at the filling port of the flexible LCD, which has a liquid crystal filling port. It realizes overall encapsulation and improves the reliability of the flexible LCD structure when bent.

[0042] The above-disclosed content is only a preferred and feasible embodiment of the present utility model, and is not intended to limit the scope of the patent application of the present utility model. Therefore, all equivalent technical changes made using the contents of the present utility model specification and drawings are included in the scope of the patent application of the present utility model.

[0043] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0044] Although this application has been described through embodiments, those skilled in the art will recognize that many modifications and variations are possible without departing from the spirit of this application, and it is intended that the appended embodiments include these modifications and variations without departing from this application.

Claims

1. A flexible LCD structure, characterized by, include: A first flexible substrate and a second flexible substrate, wherein the first flexible substrate includes a first TAC thin film layer, a first PVA polarizing film layer and a second TAC thin film layer arranged sequentially from top to bottom, and the second flexible substrate includes a third TAC thin film layer, a second PVA polarizing film layer and a fourth TAC thin film layer arranged sequentially from top to bottom; A first nano-silver film layer and a second nano-silver film layer are formed. The first nano-silver film layer is formed on the second TAC film layer by letterpress printing, and a PI layer is formed on the other side of the nano-silver film. The second nano-silver film layer is formed on the third TAC film layer by letterpress printing. A first PI layer and a second PI layer, wherein the first PI layer is disposed on the side of the first silver nanofilm layer opposite to the second TAC film layer, and the second PI layer is disposed on the side of the second silver nanofilm layer opposite to the third TAC film layer. A plurality of spacer pillars, one side of which is coated on the first PI layer with negative photoresist, and the other side of which abuts against the second PI layer; A frame adhesive is disposed between the second and third TAC film layers, and the frame adhesive is bonded to the outer wall of the first and second nano-silver film layers.

2. The flexible LCD structure of claim 1, wherein, The thickness of the first PVA polarizing film layer and the second PVA polarizing film layer is 20μm-30μm, and the thickness of the first TAC film layer, the second TAC film layer, the third TAC film layer and the fourth TAC film layer is 25μm-60μm.

3. The flexible LCD structure according to claim 1, characterized in that, The spacers are divided along the length of the first flexible substrate into a first region at the center 1 / 3 of the area and a second region at each side 1 / 3 of the area of ​​the first region. The spacing between adjacent spacers in the first region is 50μm-70μm, and the spacing between adjacent spacers in the second region is 100μm-120μm.

4. The flexible LCD structure according to claim 1, characterized in that, The diameter of the spacer column is 4μm-6μm.

5. The flexible LCD structure of claim 1, wherein, The frame adhesive is made of flexible resin.

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