Polarizer and display panel

Abstract

The utility model provides a polaroid and a display panel, and relates to the technical field of display, and the polaroid comprises a polarizing layer and an optical film layer formed on the light emitting side of the polarizing layer; the optical film layer comprises a plurality of bulge structures arranged at intervals and flat structures filled among the bulge structures, the refractive index of the bulge structures is smaller than that of the flat structures, and the cross sections of the bulge structures are gradually reduced from bottom to top, so that after light is emitted out of the bulge structures with the smaller refractive index, the light can be emitted out of the bulge structures with the smaller refractive index; when the display panel rotates, the light can be diffused by the flat structure with the large refractive index, so that the angle of the light emitted out of the polaroid is increased, the large-viewing-angle light emitting effect of the display panel when a screen rotates is improved, and the use flexibility of a user is improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a polarizer and a display panel. Background Art

[0002] Liquid crystal display panels have the advantages of good image quality, small size, light weight, low driving voltage, low power consumption, no radiation and relatively low manufacturing cost, and they dominate the display field. As the size and resolution of display panels increase, users have higher and higher requirements for color accuracy and brightness when displaying content at a wide viewing angle.

[0003] In the related art, external optical solutions are usually used to improve the wide viewing angle performance of display panels. Among them, the most common method is to add a viewing angle improvement film with different optical microstructures in the display panel to achieve the purpose of improving the wide viewing angle display quality.

[0004] However, this viewing angle improvement film can only improve the light emission effect at a specific viewing angle. For example, when the user watches in landscape orientation, the viewing angle improvement film can improve the light emission effect at left and right viewing angles. However, when displayed in portrait orientation, it loses the function of improving the light emission effect at left and right viewing angles, and is not flexible enough in use. Utility Model Content

[0005] In view of this, the present application provides a polarizer and a display panel, which are used to improve the wide-viewing angle light output effect of the display panel and the flexibility of user use.

[0006] In order to achieve the above-mentioned purpose, in a first aspect, an embodiment of the present application provides a polarizer, which is applied to a display panel, and the polarizer includes: a polarizing layer and an optical film layer formed on a light-emitting side of the polarizing layer;

[0007] The optical film layer includes a plurality of convex structures arranged at intervals and a flat structure filled between the convex structures. The refractive index of the convex structure is smaller than that of the flat structure, and the cross section of the convex structure gradually decreases from bottom to top.

[0008] In an optional implementation of the first aspect, the protruding structure is in the shape of a prism or a hemisphere.

[0009] In an optional implementation of the first aspect, when the protruding structure is in a prism shape, the protruding structure is a right prism structure.

[0010] In an optional implementation of the first aspect, the protruding structure is a quadrangular pyramid structure.

[0011] In an optional implementation of the first aspect, the protruding structures are arranged in an array.

[0012] In an optional implementation of the first aspect, the material of the protruding structure is PET, and the material of the flat structure is transparent resin.

[0013] In an optional implementation of the first aspect, the interval between adjacent protrusion structures is 10 um to 30 um.

[0014] In a second aspect, an embodiment of the present application provides a display panel, comprising: the polarizer described in the first aspect or any embodiment of the first aspect and a display substrate, wherein the polarizer is attached to the light emitting side of the display substrate.

[0015] In a possible implementation of the second aspect, the protrusion structures correspond one-to-one to the sub-pixels in the display substrate.

[0016] In a possible implementation of the second aspect, in the light emitting direction of the polarizer, the projection of the protrusion structure is located within the projection range of the corresponding sub-pixel.

[0017] The polarizer and display panel provided in the present application include: a polarizer layer and an optical film layer formed on the light-emitting side of the polarizer layer; the optical film layer includes a plurality of convex structures arranged at intervals and a flat structure filled between the convex structures, the refractive index of the convex structure is smaller than the refractive index of the flat structure, and the cross-section of the convex structure gradually decreases from bottom to top, so that after the light is diffused through the optical film layer, the wide-angle light-emitting effect of the display panel when the screen is rotated can be improved, and the flexibility of user use can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic cross-sectional view of a first polarizer provided in an embodiment of the present application;

[0019] Figure 2 A schematic top view of a polarizer provided in an embodiment of the present application;

[0020] Figure 3 A schematic cross-sectional view of a second polarizer provided in an embodiment of the present application;

[0021] Figure 4 A schematic cross-sectional view of a third polarizer provided in an embodiment of the present application;

[0022] Figure 5 A schematic diagram of the structure of a display panel provided in an embodiment of the present application.

[0023] Description of reference numerals:

[0024] 10-polarizing layer; 20-optical film layer; 21-convex structure; 22-flat structure; 100-polarizer; 200-display substrate. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] In order to adapt to the horizontal screen display of the display content, a viewing angle improvement film with different optical microstructures is usually attached to the polarizer. When the display content is displayed in horizontal screen, the light from the positive viewing angle can be refracted to the left and right large viewing angles through the light splitting effect of the optical microstructure, thereby improving the light output effect of the left and right viewing angles of the display panel.

[0027] However, this viewing angle improvement film can only improve the viewing angle in two directions. If the display content is switched to vertical screen display, it can only improve the light emission effect in the up and down directions, but loses the function of wide viewing angle diffusion for the left and right sides of the vertical screen.

[0028] In order to solve the above technical problems, an embodiment of the present application provides a polarizer applied to a display panel to increase the visible range of the display panel and improve the light emitting effect of the display panel.

[0029] The polarizer may include a polarizing layer (or polarizer base layer) and an optical film layer formed on the light-emitting side of the polarizing layer. The optical film layer may include a plurality of convex structures arranged at intervals and a flat structure filled between the convex structures, the refractive index of the convex structure may be smaller than the refractive index of the flat structure, and the cross-section of the convex structure may gradually decrease from bottom to top.

[0030] The technical solution of the present application is described in detail below in conjunction with the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present application, but should not be understood as limiting the present application.

[0031] Figure 1 A cross-sectional schematic diagram of the first polarizer provided in the embodiment of the present application is shown in FIG. Figure 1 As shown, the polarizer may include a polarizing layer 10 and an optical film layer 20. The optical film layer 20 may be attached to the light-emitting side of the polarizing layer 10. The polarizing layer 10 may control the polarization direction of a specific light beam. When the outgoing light of the display panel passes through the polarizing layer 10, the light whose vibration direction is perpendicular to the transmission axis of the polarizing layer will be absorbed, so that only the polarized light whose vibration direction is parallel to the transmission axis of the polarizing layer is left in the transmitted light.

[0032] In some embodiments, the polarizing layer 10 may include a release film (or referred to as a Release film), a pressure sensitive adhesive (PSA) layer, a triacetyl cellulose (TAC) film, a polyvinyl alcohol (PVA) film, a TAC film, and a protective film stacked from bottom to top.

[0033] The release film can protect the PSA layer and reduce the damage to the PSA layer. The thickness of the release film can be 35μm-40μm, and the thickness of the PSA layer can be 10μm-25μm.

[0034] The TAC film can be a support for the PVA film, which can ensure that the PVA film does not shrink and reduce the influence of external water vapor on the PVA film, thereby improving the weather resistance of the polarizing layer 10. The thickness of the TAC film can be 20 μm-85 μm.

[0035] PVA film, also known as polarizing film, has high transparency, high ductility, excellent iodine adsorption and good film-forming properties. It has been widely used in the polarizing layer 10. The PVA film can absorb iodine molecules with biaxial absorption function after dyeing. By stretching, the iodine molecules can be arranged in order on the PVA film, thereby forming a polarizing film with uniform biaxial absorption performance, and its transmission axis is perpendicular to the stretching direction. The quality of the PVA film directly affects the polarization performance, transmittance, polarizer color tone and optical durability of the polarizing layer 10. The thickness of the PVA film can be 40μm-80μm.

[0036] The protective film can reduce the damage to the polarizing layer 10 , and the thickness of the protective film can be 5 μm-30 μm.

[0037] The above exemplary film structure of the polarizing layer 10 is described. It can be understood that, in addition to the above film structure, at least one other film structure, such as a phase difference film, can also be included below and adjacent to the film structure. Of course, the polarizing layer 10 can also be a film layer with polarizing effect in the prior art, and the present application embodiment does not impose any particular limitation on this.

[0038] After passing through the polarizing layer 10 , the light reaches the optical film layer 20 and can be emitted through a plurality of protruding structures 21 and the flat structures 22 filled between the protruding structures 21 .

[0039] Both the convex structure 21 and the flat structure 22 are made of light-transmitting materials. The refractive index of the convex structure 21 may be n1, and the refractive index of the flat structure 22 may be n2. The refractive index n1 may be smaller than the refractive index n2.

[0040] For example, in a possible implementation, the material of the protrusion structure 21 may be polyethylene terephthalate (PET), which has a highly symmetrical molecular structure and thus has good film-forming properties and moldability, thereby reducing the difficulty of preparing the protrusion structure 21. Moreover, PET also has a high heat deformation temperature, thereby increasing the service life of the polarizer.

[0041] The material of the flat structure 22 can be a transparent resin, which has good transparency, thereby reducing the loss of light. The transparent resin can include epoxy resin, acrylic resin, polyurethane resin, etc. In actual products, the transparent resin can be selected according to actual needs to meet the requirements that its refractive index n2 can be greater than the refractive index n1 of the protruding structure 21.

[0042] See also Figure 1 After reaching the optical film layer 20, the light entering the flat structure 22 can directly exit the optical film layer 20, and part of the light entering the convex structure 21 can be directly emitted from the upper surface of the prism, and the other part is irradiated on the side of the convex structure 21. After the light obliquely incident on the side exits the prism, since the refractive index of the convex structure 21 can be smaller than the refractive index of the flat structure 22, the incident angle θ of the light will be greater than the refraction angle α of the light, so that the light emitted from the sides of the convex structure 21 can change the direction of the emitted light under the refraction of the flat structure 22, thereby increasing the viewing angle range of the display panel and improving the light output effect of each viewing angle of the display panel.

[0043] In the embodiment of the present application, the protrusion structure 21 is Figure 1 The prism shape in the figure is used as an example for illustrative description. It can be understood that the protrusion structure 21 can also be other shapes that can perform viewing angle diffusion (or called splitting).

[0044] In the case where the protruding structure 21 is in the shape of a prism, the protruding structure 21 may be a regular prism structure. For example, the protruding structure 21 may be Figure 1 The four-sided pyramid structure shown in the figure can achieve four-way (i.e., up, down, left, and right) viewing angle compensation. When a user views displayed content, the polarizer provided in the embodiment of the present application can compensate for both the left and right viewing angles in the horizontal screen and the left and right viewing angles in the vertical screen, thereby improving the user viewing experience.

[0045] It is understandable that when the protruding structure 21 is in the shape of a prism, the more sides of the prism, the more uniform the light splitting is at each viewing angle. In an optional implementation, the shape of the protruding structure 21 can also be hemispherical, so that 360-degree full-range viewing angle compensation can be achieved.

[0046] The protrusion structure 21 may have a size in the micrometer range and thus may be referred to as a microstructure. Figure 1 and Figure 2 The protruding structures 21 may be arranged at equal intervals. Specifically, the protruding structures 21 may be arranged in an array, and the interval between adjacent protruding structures 21 may be 10 um to 30 um, thereby reducing the difficulty of preparation.

[0047] For example, in the case where the raised structure 21 is a prism, during the preparation process, a steel roller pre-engraved with a prism shape can be used to roll a substrate with a refractive index of n1, so that a precisely carved prism shape can be obtained on the substrate, and then a material filling a flat structure with a refractive index of n2 can be coated on the structural film forming the prism and cured at an appropriate temperature to remove excess solvent, thereby completing the preparation of the optical film layer 20.

[0048] In an optional implementation, the protruding structures 21 in the optical film layer 20 may also be arranged at unequal intervals. For example, in the edge area of ​​the optical film layer 20 close to the display panel, the interval between the protruding structures 21 may be smaller than the interval between the protruding structures 21 in the central area of ​​the display panel. This ensures that while the brightness at the normal viewing angle is ensured, the protruding structures 21 can also better enhance the light emitting effect at a wide viewing angle.

[0049] In some embodiments, see Figure 3 The bottoms of adjacent protruding structures 21 may also be connected through a base layer, and the material of the base layer may be the same as that of the protruding structures 21 , so that the flatness of the lower surface of the optical film layer 20 may be improved, and the degree of adhesion between the optical film layer 20 and the polarizing layer 10 may be improved.

[0050] In an alternative implementation, see Figure 4 The material of the flat structure 22 may also be disposed on the upper surface of the protruding structure 21 to improve the flatness of the upper surface of the optical film layer 20 .

[0051] The polarizer provided in the embodiment of the present application may include a polarizing layer and an optical film layer formed on the light-emitting side of the polarizing layer; the optical film layer includes a plurality of convex structures arranged at intervals and a flat structure filled between the convex structures, the refractive index of the convex structure is smaller than the refractive index of the flat structure, and the cross-section of the convex structure gradually decreases from bottom to top, so that the light obliquely incident on the side of the convex structure can change the direction of the outgoing light after passing through the splitting effect of the flat structure, thereby increasing the visible range of the display panel and improving the light emitting effect of the display panel.

[0052] Based on the same inventive concept, an embodiment of the present application also provides a display panel, which may be an organic electroluminescence display (OLED) display panel, a quantum dot light emitting diode (QLED) display panel, or of course, other display panels, such as a liquid crystal display (LCD) display panel.

[0053] Figure 5 A schematic diagram of the structure of a display panel provided in an embodiment of the present application is shown in FIG. Figure 5 As shown, the display panel may include the polarizer 100 and the display substrate 200 described in the above embodiment, wherein the polarizer 100 is attached to the light emitting side of the display substrate 200 .

[0054] The polarizer 100 may include a polarizing layer 10 (or referred to as a polarizer base layer) and an optical film layer 20 formed on the light-emitting side of the polarizing layer 10. The optical film layer 20 may include a plurality of convex structures 21 arranged at intervals and a flat structure 22 filled between the convex structures 21, the refractive index of the convex structure 21 may be smaller than the refractive index of the flat structure 22, and the cross section of the convex structure 21 may gradually decrease from bottom to top.

[0055] Considering that if one sub-pixel corresponds to two protruding structures 21 , for example, a red sub-pixel and a green sub-pixel share one protruding structure 21 , there may be a problem of light mixing after the light is diffused.

[0056] In an embodiment of the present application, the protruding structure 21 can correspond one-to-one to the sub-pixels (not shown) in the display substrate, and the spacing between adjacent protruding structures 21 can be smaller than the area of ​​the sub-pixels. Specifically, in the light emitting direction of the polarizer 100, the projection of the protruding structure 21 is located within the projection range of the corresponding sub-pixel, thereby improving the contrast of the display panel and further improving the display quality.

[0057] Since the display panel in this embodiment includes the polarizer in the above embodiment, that is, the display panel in this embodiment has all the technical features and technical effects of the above polarizer embodiments, specific reference is made to the above embodiment and no further details are given here.

[0058] It should be understood that in the description of the present application specification and the appended claims, the terms "include", "comprises", "has" and any variations thereof are intended to cover non-exclusive inclusions and mean "including but not limited to", unless otherwise specifically emphasized.

[0059] In the description of this application, unless otherwise specified, " / " indicates that the objects associated with each other are in an "or" relationship. For example, A / B can represent A or B. "And / or" in this application is used to describe the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural.

[0060] Furthermore, in the description of the present application, unless otherwise specified, "plurality" refers to two or more than two. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items.

[0061] In addition, in the description of the present application, it should be understood that the terms "center", "length", "width", "thickness", "longitudinal", "horizontal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0062] In the present application, unless otherwise clearly stipulated and limited, the terms "install", "connect", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in this application according to the specific circumstances.

[0063] In addition, in the description of the present specification and the appended claims, the terms "first", "second", etc. are used to distinguish similar objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein; the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0064] In the embodiments of the present application, the words "exemplarily" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplarily" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplarily" or "for example" is intended to present related concepts in a specific way.

[0065] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. appearing in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A polarizer, applied to a display panel, characterized in that: The polarizer comprises: a polarizing layer and an optical film layer formed on the light-emitting side of the polarizing layer; The optical film layer includes a plurality of convex structures arranged at intervals and a flat structure filled between the convex structures. The refractive index of the convex structure is smaller than the refractive index of the flat structure, and the cross-section of the convex structure gradually decreases from bottom to top.

2. The polarizer according to claim 1, characterized in that: The protruding structure is in a prism shape or a hemispherical shape.

3. The polarizer according to claim 2, characterized in that: When the protruding structure is in a prism shape, the protruding structure is a regular prism structure.

4. The polarizer according to claim 3, characterized in that: The raised structure is a quadrangular pyramid structure.

5. The polarizer according to claim 1, characterized in that: The protruding structures are arranged in an array.

6. The polarizer according to claim 1, characterized in that: The material of the protruding structure is PET, and the material of the flat structure is transparent resin.

7. The polarizer according to any one of claims 1 to 6, characterized in that: The interval between adjacent protrusion structures is 10um to 30um.

8. A display panel, characterized in that: include: The polarizer and display substrate as described in any one of claims 1 to 7, wherein the polarizer is attached to the light emitting side of the display substrate.

9. The display panel according to claim 8, characterized in that: The protruding structures correspond one to one to the sub-pixels in the display substrate.

10. The display panel according to claim 8 or 9, characterized in that: In the light emitting direction of the polarizer, the projection of the protruding structure is located within the projection range of the corresponding sub-pixel.

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