WO2020062592A1 - Polarizer and display device - Google Patents

Abstract

A polarizer and a display device. The polarizer comprises: a first phase compensation film (20) having a small refractive index, a plurality of recesses (220) being provided on the first phase compensation film (20); and a second phase compensation film (30) having a large refractive index, a plurality of protrusion structures (310) matching the recesses (220) being provided on the second phase compensation film (30).

Description

Polarizing plate and display device

Cross-reference to related applications

This application claims priority from a Chinese patent application filed with the Chinese Patent Office on September 30, 2018, with application number 201821625092.2, and with the application name "polarizing plate, display panel, and display device", the entire contents of which are incorporated herein by reference. in.

Technical field

The present application relates to the field of display technology, and in particular, to a polarizing plate and a display device.

Background technique

The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.

With the development of display technology, display devices have been widely used because of their advantages such as high picture quality, power saving, and thin body. Among them, the quality of the picture is the most important factor affecting consumer experience. The display device is generally composed of a backlight module and a display panel placed on the backlight module. The backlight module provides incident light for the display panel. The incident light is usually concentrated and incident on the display panel. Therefore, when viewing the display screen in the frontal direction, It can obtain better display image quality, but when viewing the display screen in the side view direction, the image quality is poor and the color cast is more serious, which makes the viewing angle of normal display smaller. At present, in a VA (Vertical Alignment Liquid Crystal) vertical liquid crystal display, a sub-pixel in a filter is again divided into a plurality of sub-pixels to improve the image quality of a side viewing angle, thereby expanding the viewing angle. However, this method requires more TFT (Thin Film Transistor) elements to drive the sub-pixels. This will inevitably increase the metal traces inside the panel, causing the light-transmissive area to become smaller, affecting the light transmittance of the panel and affecting Picture quality. In order to ensure the brightness, it is necessary to improve the performance of the backlight module so that it can generate incident light with higher brightness, which will increase the cost of the backlight.

Application content

According to various embodiments of the present application, a polarizing plate capable of improving a display angle of a display device with a small display angle and poor side-view image quality, without increasing cost, is provided.

In addition, a display device is provided.

A polarizing plate includes:

Pressure-sensitive adhesive layer

A first phase compensation film is formed on the pressure-sensitive adhesive layer and has a light incident surface and a light emitting surface; the light incident surface of the first phase compensation film is in contact with the pressure sensitive adhesive layer, and the first phase compensation The light emitting surface of the film is provided with a plurality of grooves having a predetermined shape, and an included angle between a side surface of the groove and the light incident surface is an acute angle;

A second phase compensation film is formed on the light emitting surface; a second refractive index of the second phase compensation film is greater than a first refractive index of the first phase compensation film; A plurality of convex structures matched with the shape and size of the groove are provided on a surface contacted by the first phase compensation film; and

A polarizing film is formed on the second phase compensation film.

A polarizing plate includes:

Pressure-sensitive adhesive layer

A first phase compensation film is formed on the pressure-sensitive adhesive layer and has a light incident surface and a light emitting surface; the light incident surface of the first phase compensation film is in contact with the pressure sensitive adhesive layer, and the first phase compensation The light emitting surface of the film is provided with a plurality of triangular pyramid-shaped grooves, and an included angle between a side surface of the triangular pyramid-shaped grooves and the light incident surface is an acute angle;

A second phase compensation film is formed on the light emitting surface; a second refractive index of the second phase compensation film is greater than a first refractive index of the first phase compensation film; A plurality of triangular pyramid-shaped convex structures matching the shape and size of the triangular pyramid-shaped groove are opened on a surface contacted by the first phase compensation film; and

A polarizing film is formed on the second phase compensation film.

A display device includes:

A backlight module configured to provide a light source; and

A display panel is placed on one side of the backlight module and is set as a display screen;

The display panel includes a polarizing plate, and the polarizing plate includes:

Pressure-sensitive adhesive layer

A first phase compensation film is formed on the pressure-sensitive adhesive layer and has a light incident surface and a light emitting surface; the light incident surface of the first phase compensation film is in contact with the pressure sensitive adhesive layer, and the first phase compensation The light emitting surface of the film is provided with a plurality of grooves having a predetermined shape, and an included angle between a side surface of the groove and the light incident surface is an acute angle;

A second phase compensation film is formed on the light emitting surface; a second refractive index of the second phase compensation film is greater than a first refractive index of the first phase compensation film; A plurality of convex structures matched with the shape and size of the groove are provided on a surface contacted by the first phase compensation film; and

A polarizing film is formed on the second phase compensation film.

Since the above-mentioned polarizing plate and display device are provided with a first phase compensation film and a second phase compensation film, and the first refractive index is smaller than the second refractive index, that is, light is incident from the light incident surface of the first phase compensation through the light emitting surface and then emitted When entering the second phase compensation film, it is from the photophosphine to the light dense. Therefore, a refraction phenomenon occurs at the contact interface between the two films, and the light is deflected. In this solution, a convex structure is formed on a side of the second phase compensation film that is in contact with the first phase compensation film, and an angle between the side surface of the convex structure and the light incident surface is an acute angle. After the perpendicular incident light enters the second phase compensation film, The incident angle formed on the surface of the raised structure is less than 90 °, so a refraction phenomenon occurs, which deflects the light incident vertically, thereby distributing the energy of the positive viewing angle to the side viewing angle and improving the image quality of the side viewing angle. In addition, since no additional metal wiring is used in the entire polarizing plate, there is no problem that affects the transmittance of light and further affects the image quality.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments or exemplary technologies of the present application, the drawings used in the embodiments or exemplary technical descriptions will be briefly introduced below. Obviously, the drawings in the following description are merely These are some embodiments of the present application. For those of ordinary skill in the art, without any creative effort, drawings of other embodiments can be obtained according to these drawings.

FIG. 1 is a schematic diagram of the composition of a polarizing plate in an embodiment; FIG.

2 is a schematic structural diagram of a second phase compensation film in FIG. 1;

3 is a perspective view of a second phase compensation film in an embodiment;

4 is a schematic diagram of a composition of a polarizing plate in another embodiment;

5 is a perspective view of a second phase compensation film in another embodiment;

FIG. 6 is a schematic diagram of a display device according to an embodiment; FIG.

FIG. 7 is a schematic diagram of the composition of the display panel in FIG. 6.

detailed description

In order to facilitate understanding of the present application, the present application will be described more fully with reference to the related drawings. The drawings show alternative embodiments of the present application. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and comprehensive understanding of the disclosure of this application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the specification of the application herein is only for the purpose of describing specific embodiments, and is not intended to limit the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

As shown in FIG. 1, the polarizing plate may include a pressure-sensitive adhesive layer 10, a first phase compensation film 20, a second phase compensation film 30, and a polarizing film 40. The pressure-sensitive adhesive layer 10 is mainly provided to adhere a polarizing plate and other components. The first phase compensation film 20 is formed on the pressure-sensitive adhesive layer 10. The first phase compensation film 20 has a light-incident surface and a light-exit surface. The light-incident surface is a side that receives incident light. The surface is in contact with the pressure-sensitive adhesive layer 10, and the light enters the first phase compensation film 20 from the incident surface and exits from the light emitting surface. The light emitting surface is provided with a plurality of grooves 220 having a predetermined shape. The angle formed by the surface is α, and α is an acute angle, which satisfies 0 ° <α <90 °. The angle between the side of the groove 220 and the light incident surface is set to an acute angle, so that when light enters the first phase compensation film 20 from the light incident surface and exits from the light emitting surface, it will be caused by the groove 220 opened on the light emitting surface. Refraction occurs. The second phase compensation film 30 is formed on the first phase compensation film 20. The second phase compensation film 30 is provided with a plurality of protrusions having the same shape and size as the grooves 220 on the surface in contact with the first phase compensation film 20. The structure 310, that is, the second phase compensation film 30 and the first phase compensation film 20 can be completely bonded to each other through the protruding structure 310 and the groove 220. The first phase compensation film 20 has a first refractive index n1, the second phase compensation film 30 has a second refractive index n2, and the first refractive index n1 is smaller than the second refractive index n2. When light penetrates the first phase compensation film 20 and enters the second phase compensation film 30, it enters the light dense from the photophosphine, so refraction occurs at the contact interface between the first phase compensation film 20 and the second phase compensation film 30. . In the display device, since most of the light is incident into the polarizing plate vertically, that is, most of the light is perpendicular to the light incident surface, the first phase compensation film 20 and the second phase compensation film 30 having different refractive indexes are provided in this solution. A convex structure 310 is provided on the light exit surface of the second phase compensation film 30. When the vertically incident light is incident from the first phase compensation film 20 to the second phase compensation film 30, combined with the surface characteristics of the convex structure 310, The surface of the structure 310 is refracted, and the propagation path of the vertically incident light is changed to deflect the light, so that the light energy of the normal viewing angle is distributed to the large viewing angle, and the image quality of the side viewing angle is improved. The polarizing plate 10 further includes a polarizing film 40. The polarizing film 40 is configured to polarize incident light and emit the polarized light.

In one embodiment, the polarizing film 40 may be a PVA (Polyvinyl alcohol) material, which mainly absorbs and penetrates polarized light. The polarizing film 40 is a product commonly used in the market. The transmission axis is Parallel to the 90/270 degree direction, the absorption axis is parallel to the 0/180 degree direction. Of course, the polarizing film 40 can also be selected from products in which the transmission axis is parallel to the 0/180 degree direction and the absorption axis is parallel to the 90/270 degree direction.

Please refer to FIG. 1 and FIG. 2 simultaneously. When the light R0 vertically penetrates the first phase compensation film 20 and enters the second phase compensation film 30, the incident angle of the vertically incident light at the surface of the convex structure 310 is γ, 0 <γ < 90 °, so the light will be refracted, the refraction angle is θ, because the light enters the second phase compensation film 30 (light (Dense quality), so γ is larger than θ, that is, the light propagation path is changed, and the light R1 deviates from the original normal incident direction and diverges to the side. Therefore, more light enters the side and improves the image quality of the side viewing angle. It can be understood that the larger the difference between the first refractive index n1 and the second refractive index n2, the larger the refraction angle when refraction occurs, and the easier it is to distribute the frontal light type energy to a large viewing angle. In one embodiment, the value range of the first refractive index n1 is 1.0 <n1 <2.5, and the value range of the second refractive index n2 is 1.0 <n2 <2.5. In one embodiment, if m = n2-n1, the selectable value range of m is 0.01 <m <1.5.

As shown in FIG. 2, reference is also made to FIG. 3. When the protrusion structure 310 of the second phase compensation film 30 is a triangular prism strip structure (V-shaped strip protrusion structure), the distance between adjacent triangular prism protrusions in the first direction is greater than or equal to three The length of the prism protrusion in the first direction. Here, the extension direction of the surface of the second phase compensation film 30 that is in contact with the first phase compensation film 20 perpendicular to the triangular prism-shaped convex structure (V-shaped convex structure) is the first direction, which can also be understood as Extension direction along the X axis. The triangular prism may be a regular triangular prism, or it may not be a regular triangular prism; the sizes of the multiple triangular prisms may be the same or different. The plurality of triangular prism protruding structures 310 are parallel to each other on a surface where the second phase compensation film 30 and the first phase compensation film 20 contact. The surface of the second phase compensation film 30 that is in contact with the first phase compensation film 20 is rectangular. As shown in FIG. 2, Px is the distance between adjacent triangular prism strip structures, Lx is the length of the triangular prism strip structures in the first direction, and Px and Lx satisfy: Px ≧ Lx.

Similarly, when the protrusion structure 310 is a triangular pyramid protrusion structure, since it can have the same cross-section as a triangular prism protrusion, reference may be made to FIG. 2 and FIG. 4 at the same time. Adjacent triangular pyramid protrusions The distance of the structure 310 in the first direction is greater than or equal to the length of the triangular pyramidal protrusion structure 310 in the first direction; the distance of the adjacent triangular pyramidal protrusion structure 310 in the second direction is greater than or equal to the triangular pyramidal protrusion structure The length of 310 in the second direction, where the surface where the second phase compensation film 30 and the first phase compensation film 20 are in contact is rectangular, so the extension direction of the rectangular width is taken as the first direction, which can also be understood as along X The extension direction of the axis; the extension direction of the rectangular length is the second direction, which can be understood here as the extension direction along the Y axis. The triangular prism may be a regular triangular pyramid, or may not be a regular triangular pyramid. The sizes of the multiple triangular pyramids may be the same or different. It can be understood that the shape, size, and size of the groove can be changed without departing from the core principle of the application to meet the actual needs of those skilled in the art. As shown in FIG. 5, Px is the distance in the first direction of adjacent triangular pyramidal protrusion structures 310; Py is the distance in the second direction of adjacent triangular pyramidal protrusion structures 310; Lx is triangular pyramidal protrusions The length of the structure 310 in the first direction; Ly is the length of the triangular pyramidal protrusion structure 310 in the second direction. Px, Py, Lx, and Ly satisfy: Px≥Lx; Py≥Ly. When Px> Lx and Py> Ly, there are gaps between adjacent convex structures 310, that is, the convex structures 310 are distributed in a two-dimensional matrix array. When light travels from photophosphine to light dense, the space and protrusion can be used. Disperse the vertically incident light toward the side, further distribute the energy of the frontal light to the side viewing angle, and improve the image quality of the side viewing angle.

Optionally, when the convex structure is a V-shaped strip, a plurality of V-shaped strip-shaped convex structures may also be distributed in a two-dimensional matrix array, and the arrangement in two dimensions may refer to the front triangular pyramid convex structure. The description is not repeated here. Due to the space between adjacent convex structures, the convex junctions are distributed in a two-dimensional matrix array. When light propagates from optically dense to light dense, vertical incident light can be diffused toward the side by means of the interval and convexity. The front-view light energy is further allocated to the side viewing angle to improve the image quality of the side viewing angle.

The first phase compensation film 20 and the second phase compensation film 30 may be a single optical axis optical compensation film made of a light-transmissive transparent or translucent material and having a function of phase compensation. In one embodiment, the phase compensation film Filled with liquid crystal, liquid crystal is a birefringent material. When light enters the liquid crystal, it will be refracted into two rays of normal light and abnormal light. Among them, the refractive index of normal light is the normal refractive index, and the refractive index of abnormal light is the abnormal refractive index. The rate direction is a direction in which the direction of the electric field is parallel to the optical axis of the liquid crystal, the direction of the normal refractive index is a direction in which the electric field is perpendicular to the optical axis of the liquid crystal, and the direction of the abnormal refractive index is perpendicular to the direction of the normal refractive index. In this embodiment, the first phase compensation film 20 may be a negative single optical axis compensation film, and specifically may be a negative single optical axis C-compensation film. The normal refractive index of the negative single optical axis C-compensation film is parallel to All directions of the light emitting surface. Negative uniaxial C-compensation film can be filled with dish-shaped liquid crystal molecules, the dish-shaped liquid crystal molecules are dish-shaped liquid crystals, the optical axis of the dish-shaped liquid crystal is perpendicular to the light incident surface, and the abnormal refractive index of the dish-shaped liquid crystal nce (extraordinary refractive index) ) Direction is parallel to the optical axis of the dish-shaped liquid crystal, and the normal refractive index nco (ordinary refractive index) direction of the dish-shaped liquid crystal is perpendicular to the abnormal refractive index (extraordinary refractive index) direction, that is, the normal refractive index nco direction of the dish-shaped liquid crystal is parallel to Incident surface, and nco> nce. The second phase compensation film 30 may be a positive single optical axis compensation film, and specifically may be a positive single optical axis A-compensation film, which also has an abnormal refractive index and a normal refractive index; the inside of the positive single optical axis A-compensation film Nematic liquid crystal molecules can be filled. The nematic liquid crystal molecules are long rod-shaped liquid crystals. The optical axis of the nematic liquid crystal is parallel to the light incident surface. The abnormal refractive index nae of the nematic liquid crystal and the optical axis of the nematic liquid crystal are filled. Parallel, that is, the abnormal refractive index nae direction of the nematic liquid crystal is parallel to the light incident surface, the normal refractive index nao direction of the nematic liquid crystal is perpendicular to the abnormal refractive index nae direction, and nae> nao; in this embodiment, the first The refractive index is the abnormal refractive index nae of the second phase compensation film 30, and the second refractive index is the normal refractive index nco of the C-compensation film. The direction of nae and the direction of nco are both parallel to the light incident surface.

Optionally, the refractive index of the first phase compensation film 20 may be 1.0-2.5, and the first refractive index here is also a normal refractive index, that is, nco (ordinary refractive index). The abnormal refractive index (second refractive index) of the second phase compensation film 30 is larger than the normal refractive index (first refractive index) of the first phase compensation film 20. In other words, the first phase compensation film 20 is an optically sparse medium with respect to the second phase compensation film 30, and the second phase compensation film 30 is an optically dense medium with respect to the first phase compensation film 20. Specifically, the range of the difference between the abnormal refractive index of the second phase compensation film 30 and the normal refractive index of the first phase compensation film 20 is optionally 0.01-2. Theoretically, the larger the difference between the abnormal refractive index of the second phase compensation film 30 and the normal refractive index of the first phase compensation film 20 is, the easier it is when the incident light is incident on the second phase compensation film 30 perpendicularly and the refractive effect occurs. Light energy from a positive viewing angle is distributed to a side viewing angle.

The polarizing film 40 has an absorption axis and a transmission axis, and polarized light having a polarization direction parallel to the transmission axis can pass through the polarizing film 40. In an embodiment, in order to reduce the polarization effect of the phase compensation film on light, the optical axis (optical axis of the liquid crystal) of the optical compensation film can be parallel to the transmission axis of the polarizing film 40, and the polarization of the incident light after passing through the phase compensation film The direction is parallel to the transmission axis of the polarizing film 40, so it can completely pass through the polarizing film. In this solution, because the optical compensation film also has a phase compensation function, in addition to using the optical compensation film to deflect incident light at the interface to expand the viewing angle and enhance the quality of the side viewing angle, it can also play a role in phase compensation.

In the exemplary technology, polyvinyl alcohol is usually used as a polarizing film, and polyvinyl alcohol has extremely strong hydrophilicity. In order to protect the physical properties of the polarizing film, it mainly absorbs and penetrates polarized light. Polarized light in this application The film 40 is selected from products currently used in the market. The penetration axis is parallel to the 90/270 degree direction, and the absorption axis is parallel to the 0/180 degree direction. Usually a layer of triacetate cellulose support film is required on both sides of the polarizer. The triacetate cellulose support film has high light transmittance, good water resistance and certain mechanical strength, and can protect the polarizer. In this embodiment, since a first phase compensation film 20 having a groove 220 and a second phase compensation film 30 having a protrusion 310 are provided on one side of the polarizer, the first phase compensation film 20 and the second phase compensation The film 30 can perform phase compensation and deflect light, and can also serve as a protective layer to protect the polarizing film 40. Therefore, the triacetate cellulose supporting film on the light-entering side of the polarizer can be omitted in the polarizing plate, which is beneficial to thinning the product. design. It should be noted that the thickness of the first phase compensation film 20 and the thickness of the second phase compensation film 30 (that is, D + d in FIG. 2) need to satisfy a suitable thickness to achieve the protective effect on the polarizing film.

Please continue to refer to FIG. 4, which is a schematic diagram of the composition of a polarizing plate in another embodiment. A polarizing plate may include a pressure-sensitive adhesive layer 10, a first phase compensation film 20, a second phase compensation film 30, a polarizing film 40 and Support protective film 50. The pressure-sensitive adhesive layer 10 is mainly provided to adhere a polarizing plate and other components. The first phase compensation film 20 is formed on the pressure-sensitive adhesive layer 10. The first phase compensation film 20 has a light incident surface and a light emitting surface. The light incident surface of the first phase compensation film 20 is in contact with the pressure sensitive adhesive layer 10. The light surface is the side that receives incident light. The light enters the first phase compensation film 20 from the incident surface and exits from the light emitting surface. The light emitting surface is provided with a plurality of grooves 220 having a predetermined shape. The second phase compensation film 30 is formed on The first refractive index of the first phase compensation film 20 is smaller than the second refractive index of the second phase compensation film 30. The first phase compensation film 20 is provided with a plurality of grooves 220 having a predetermined shape on the light emitting surface, and an included angle between a side surface of the groove 220 and the light incident surface is an acute angle. The second phase compensation film 30 is provided with a plurality of convex structures 310 matching the shape and size of the groove 220 on the surface in contact with the first phase compensation film 20. A polarizing film 40 is formed on the second phase compensation film 30; and a support protective film 50 is formed on the polarizing film 40.

It can be understood that, for the structures and materials of the pressure-sensitive adhesive layer 10, the first phase compensation film 20, the second phase compensation film 30, and the polarizing film 40, reference may be made to the description in the foregoing embodiments, and no further details are provided herein.

The material of the supporting protective film 50 may include any one of a polyethylene terephthalate film, a cellulose triacetate film, or a polymethyl methacrylate film. PET (Polyethylene terephthalate) has good optical properties and weather resistance, and amorphous PET plastic has good optical transparency. In addition, PET plastic has excellent abrasion resistance, dimensional stability, and electrical insulation. TAC (Triacetyl Cellulose) is mainly set to protect LCD polarizers. PMMA (Polymethyl Methacrylate) has good chemical stability and weather resistance. At the same time, since the supporting protective film 50 plays a role of supporting and protecting the polarizing film 40, the thickness of the supporting protective film 50 should ensure that the weather resistance of the polarizing film 40 is not affected, protect the polarizing film 40 from contacting the external environment, and prevent moisture from entering polarized light Film 40.

In one embodiment, the support protective film 50 may further be doped with resin particles so that the support protective film 50 has anti-vertigo function. There is no particular limitation on the specific doping concentration in this application, which is well known to those skilled in the art, and The usual doping concentration is sufficient.

In one embodiment, an optical film may also be coated on the light-emitting surface of the support protective film 50 so that the support protective film 50 has an anti-reflection function. There is no special limitation on the thickness of the coated optical film in this application. Those skilled in the art may use the thicknesses that are well known and commonly used.

A polarizing plate is also provided. The polarizing plate may include: a first phase compensation film having a light incident surface and a light emitting surface; a plurality of grooves having a triangular pyramid shape are provided on the light emitting surface of the first phase compensation film, and the triangular pyramid shape The angle between the side of the groove and the light incident surface is an acute angle; the second phase compensation film is formed on the light emitting surface; the second refractive index of the second phase compensation film is greater than the first refractive index of the first phase compensation film; The second phase compensation film is provided on the surface in contact with the first phase compensation film with a plurality of triangular pyramid-shaped convex structures matching the shape and size of the triangular pyramid-shaped groove; a polarizing film is formed on the second phase compensation film .

In the foregoing embodiment, by providing a plurality of triangular pyramid-shaped convex structures in the second phase compensation film, and according to a refractive effect caused by a refractive index different from that of the first phase compensation film, perpendicular incidence to the second phase compensation film can be achieved. The incident light is refracted, so that the light energy of the positive viewing angle is distributed to the side viewing angle, thereby solving the problem of color misregistration. In addition, since no additional metal wiring is used in the entire polarizing plate, there is no problem that affects the transmittance of light and further affects the image quality.

In summary, referring to FIGS. 1 and 2 at the same time, the first phase compensation film 20 is a negative single optical axis C-compensation film, the groove 220 of the first phase compensation film 20 is a V-shaped groove, and the second phase The protrusion structure 310 of the compensation film 30 is a V-shaped strip protrusion. The transmission axis of the polarizing film is parallel to the 90/270 ° direction, and the absorption axis is parallel to the 0/180 ° direction. Principle: The light passes through the lower polarizer 2000 before entering the display panel, and then enters the upper polarizer 1000. The upper polarizer 1000 has the function of absorbing and penetrating polarized light. After entering the upper polarizer 1000, the light can be divided into horizontal polarization and vertical. Since the polarization axis of the polarizing film 40 used in the present application is parallel to the direction of 90/270 °, only the interface of the medium through which the polarizing light passes will be focused here. The equivalent refractive index of the light R0 of the vertical polarization component on the negative single optical axis C-compensating film is nco (ordinary refractive index). After the light of the vertical polarization component passes through the negative single optical axis C-compensating film, After passing through the positive single optical axis A-compensation film (corresponding to the refractive index of the positive single optical axis A-compensation film is nae), the vertically polarized light is at the interface between the two media (ie, the V-shaped strip in FIG. 2) (Bulge) occurs from the optically sparse medium into the light-tight medium (nae> nco). In conjunction with the acute angle formed between the convex structure 310 of the second phase compensation film 30 and the light incident surface, a refraction effect is generated to produce the outgoing light R1, forming Optical phenomenon with large viewing angle for energy distribution of positive viewing angle light type. Thus, the light energy of the positive viewing angle is allocated to the side viewing angle, and the problem of color cast is improved.

Similarly, when the polarization axis of the polarizing film 40 used is parallel to the 0/180 ° direction, the absorption axis is parallel to the 90/270 ° direction. The light passes through the lower polarizing plate 2000 before entering the display panel, and then enters the upper polarizing plate 1000. The upper polarizing plate 1000 has the function of absorbing and penetrating polarized light. After entering the upper polarizing plate 1000, the light can be divided into horizontal polarization and vertical polarization components. Light. Since the transmission axis of the polarizing film 40 used here is a parallel 0/180 ° direction, only the medium interface through which light with a horizontal polarization component passes will be focused here. The light of the horizontal polarization component passes through the polarization axis 40/180 ° direction of the polarizing film 40 (the vertically polarized light is absorbed by the polarizing film 40 absorption axis 90/270 °), which is equivalent to the negative single optical axis C-compensation film The refractive index is nco (ordinary refreactive index, normal refractive index). The light of the horizontal polarization component passes through the negative single optical axis C-compensation film and then passes through the positive single optical axis A-compensation film (corresponding to the positive single optical axis A- The refractive index of the compensation film is nae), so the horizontally polarized light enters the light-dense medium (nae> nco) from the light-sparse medium to the light-dense medium (nae> nco) at the interface between the two media (ie, the V-shaped strip-shaped protrusions in FIG. 2). A sharp angle formed between the convex structure 310 and the light incident surface of the second phase compensation film 30 produces a refraction effect, forming a positive viewing angle optical type energy distribution and a large viewing angle optical phenomenon. It is also possible to achieve the problem of color misregistration by allocating the light energy of the positive viewing angle to the side viewing angle through the above principle.

Please refer to FIG. 6, which is a schematic diagram of a display device according to an embodiment. The present application also discloses a display device including a backlight module 5 and a display panel 1 disposed above the backlight module. The backlight module 5 is configured to provide incident light R0 (not labeled in FIG. 6). The incident light R0 is incident on the display panel 1 in a concentrated manner. The divergent direction of the incident light R0 is at a small angle with the direction perpendicular to the display panel 1. Less than 30 °, most of the light received by the display panel 1 is perpendicularly incident light. Since the first phase compensation film 20 and the second phase compensation film 30 and the second phase compensation film 30 and the first phase compensation film exist in the display panel 1. The 20-contacting surface is provided with a plurality of convex structures 310 having a preset shape. The surface of the convex structure 310 can be deflected to generate the outgoing light R1 (remarked by not shown in FIG. 6) by refraction, thereby distributing the energy of the positive viewing angle. Go to the side view angle to improve the picture quality of the side view angle. The backlight module 5 may include a side-type LED light source 51, a reflection sheet 52, and a light guide plate 53. The upper and lower surfaces of the light guide plate 53 are provided with long V-shaped grooves. The side walls of the V-shaped grooves on the lower surface of the light guide plate 53 are parallel to the side-type light source 51, and the V-shaped grooves on the upper surface of the light guide plate 53 and the V-shaped grooves on the lower surface. Set up perpendicular to each other.

Please refer to FIG. 7, which is a schematic diagram of the composition of the display panel in FIG. 6. The display panel may be, for example, a TFT-LCD (Thin Film Transistor Liquid Crystal Displayer) display panel 1, an OLED (Organic Light-Emitting Diode) display panel 1, a QLED (Quantum Dot Light Emitting Diodes, Quantum dot light emitting diode) display panel 1, curved display panel 1 or other display panel 1. As shown in FIG. 7, the display panel 1 includes an upper polarizing plate 1000, a lower polarizing plate 2000, an upper substrate 3000, a lower substrate 4000, and a liquid crystal layer 6000 sandwiched between the upper substrate 3000 and the lower substrate 4000. The middle incidence order is: first enter the lower polarizing plate 2000, then pass through the lower substrate 4000, then pass through the liquid crystal layer 6000, rotate through the liquid crystal layer 6000, and then enter the upper substrate 3000, and finally enter the upper polarizing plate 1000. The upper polarizing plate 1000 is the polarizing plate described in the foregoing embodiment. The upper polarizing plate 1000 may include a first phase compensation film 20, a second phase compensation film 30, and a polarizing film 40. The first phase compensation film 20 has a first refractive index, and the second phase compensation film 30 has a second refractive index. The refractive index is smaller than the second refractive index, and the first phase compensation film 20 is provided with a plurality of grooves 220 having a predetermined shape. The angle between the side of the groove 220 and the light incident surface is an acute angle; the upper polarizing plate 1000 It may further include a support protection film 50 formed on the polarizing film 40; a side of the second phase compensation film 30 in contact with the first phase compensation film 20 is provided with a plurality of protrusions matching the shape and size of the groove 220.起 结构 310。 From the structure 310. The light is incident from the upper polarizing plate 1000 into the first phase compensation film 20 in the upper polarizing plate 1000 and enters the second phase compensation film 30. The first phase compensation film 20 and the second phase compensation film 30 can phase compensate the incident light. Because light enters light dense from photophosgene, and the incident angle of incident light on at least part of the contact surface is not equal to 90 °, a refraction phenomenon occurs, which deflects normal incident light to a side viewing angle and distributes positive viewing angle energy to the side viewing angle. To improve the quality of the side view. The specific structure of the polarizing plate has been described in detail above, and is not repeated here.

The technical features of the embodiments described above can be arbitrarily combined. In order to simplify the description, all possible combinations of the technical features in the above embodiments have not been described. However, as long as there is no contradiction in the combination of these technical features, It should be considered as the scope described in this specification.

The above-mentioned embodiments only express several implementation manners of the present application, and their descriptions are more specific and detailed, but they cannot be understood as a limitation on the scope of patent application. It should be noted that, for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of this application patent shall be subject to the appended claims.

Claims (20)

1. A polarizing plate includes:

   Pressure-sensitive adhesive layer

   A first phase compensation film is formed on the pressure-sensitive adhesive layer and has a light incident surface and a light emitting surface; the light incident surface of the first phase compensation film is in contact with the pressure sensitive adhesive layer, and the first phase compensation The light emitting surface of the film is provided with a plurality of grooves having a predetermined shape, and an included angle between a side surface of the groove and the light incident surface is an acute angle;

   A second phase compensation film is formed on the light emitting surface; a second refractive index of the second phase compensation film is greater than a first refractive index of the first phase compensation film; A plurality of convex structures matched with the shape and size of the groove are provided on a surface contacted by the first phase compensation film; and

   A polarizing film is formed on the second phase compensation film.
2. The polarizing plate according to claim 1, wherein the first phase compensation film is a negative uniaxial C-compensation film, a first refractive index of the first phase compensation film is a normal refractive index, and the first The phase compensation film includes a dish-shaped liquid crystal molecular material, and an optical axis of the dish-shaped liquid crystal molecular material is perpendicular to the light incident surface.
3. The polarizing plate according to claim 1, wherein the second phase compensation film is a positive uniaxial A-compensation film, the second refractive index of the second phase compensation film is an abnormal refractive index, and the second The phase compensation film includes a nematic liquid crystal molecular material, and an optical axis of the nematic liquid crystal molecular material is parallel to the light incident surface.
4. The polarizing plate according to claim 2, wherein the polarizing film has a transmission axis, light having a polarization direction parallel to the transmission axis can pass through the polarizing film, and the negative uniaxial C-compensation film The optical axis is perpendicular to the penetration axis.
5. The polarizing plate according to claim 1, wherein the value of the first refractive index ranges from 1.0 to 2.5.
6. The polarizing plate according to claim 1, wherein the value of the second refractive index ranges from 1.0 to 2.5.
7. The polarizing plate according to claim 1, wherein a difference between the second refractive index and the first refractive index ranges from 0.01 to 1.5.
8. The polarizing plate according to claim 1, wherein the polarizing plate further comprises a support protective film formed on the polarizing film and configured to support and protect the polarizing film.
9. The polarizing plate according to claim 8, wherein the support protective film comprises a polyethylene terephthalate film.
10. The polarizing plate according to claim 8, wherein the support protective film comprises a cellulose triacetate film.
11. The polarizing plate according to claim 8, wherein the support protective film comprises a polymethyl methacrylate film.
12. The polarizing plate according to claim 8, wherein the support protective film is doped with resin particles having a predetermined concentration.
13. The polarizing plate according to claim 1, wherein the convex structure is a V-shaped strip-shaped convex structure, and a plurality of the V-shaped strip-shaped convex structures are parallel to each other.
14. The polarizing plate according to claim 1, wherein the convex structure is a triangular pyramid convex structure, and a plurality of the triangular pyramid convex structures are in contact with the first phase compensation film at the second phase compensation film. The surface is distributed in a two-dimensional matrix array.
15. The polarizing plate according to claim 13, wherein a distance in a first direction between the adjacent protruding structures is greater than or equal to a length of the protruding structures in the first direction; A direction perpendicular to an extending direction of the V-shaped stripe-shaped convex structure on a surface of the second phase compensation film in contact with the first phase compensation film is a first direction.
16. The polarizing plate according to claim 13, wherein a surface of the second phase compensation film in contact with the first phase compensation film is rectangular, and a distance between adjacent triangular pyramidal protrusion structures in a first direction Greater than or equal to the length of the triangular pyramidal protrusion structure in the first direction; the distance of adjacent triangular pyramidal protrusion structures in the second direction is greater than or equal to the triangular pyramidal protrusion structure in the first direction The length in the second direction; wherein the extending direction of the rectangular width is the first direction, and the extending direction of the rectangular length is the second direction.
17. A polarizing plate includes:

    Pressure-sensitive adhesive layer

    A first phase compensation film is formed on the pressure-sensitive adhesive layer and has a light incident surface and a light emitting surface; the light incident surface of the first phase compensation film is in contact with the pressure sensitive adhesive layer, and the first phase compensation The light emitting surface of the film is provided with a plurality of triangular pyramid-shaped grooves, and an included angle between a side surface of the triangular pyramid-shaped grooves and the light incident surface is an acute angle;

    A second phase compensation film is formed on the light emitting surface; a second refractive index of the second phase compensation film is greater than a first refractive index of the first phase compensation film; A plurality of triangular pyramid-shaped convex structures matching the shape and size of the triangular pyramid-shaped groove are opened on a surface contacted by the first phase compensation film; and

    A polarizing film is formed on the second phase compensation film.
18. A display device includes:

    A backlight module configured to provide a light source; and

    A display panel is placed on one side of the backlight module and is set as a display screen;

    The display panel includes a polarizing plate, and the polarizing plate includes:

    Pressure-sensitive adhesive layer

    A first phase compensation film is formed on the pressure-sensitive adhesive layer and has a light incident surface and a light emitting surface; the light incident surface of the first phase compensation film is in contact with the pressure sensitive adhesive layer, and the first phase compensation The light emitting surface of the film is provided with a plurality of grooves having a predetermined shape, and an included angle between a side surface of the groove and the light incident surface is an acute angle;

    A second phase compensation film is formed on the light emitting surface; a second refractive index of the second phase compensation film is greater than a first refractive index of the first phase compensation film; A plurality of convex structures matched with the shape and size of the groove are provided on a surface contacted by the first phase compensation film; and

    A polarizing film is formed on the second phase compensation film.
19. The display device according to claim 18, wherein the display panel is a liquid crystal display panel.
20. The display device according to claim 18, wherein the display panel is an organic electroluminescence display panel.

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