WO2020062585A1 - Polariseur et dispositif d'affichage - Google Patents

Polariseur et dispositif d'affichage Download PDF

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Publication number
WO2020062585A1
WO2020062585A1 PCT/CN2018/119656 CN2018119656W WO2020062585A1 WO 2020062585 A1 WO2020062585 A1 WO 2020062585A1 CN 2018119656 W CN2018119656 W CN 2018119656W WO 2020062585 A1 WO2020062585 A1 WO 2020062585A1
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WO
WIPO (PCT)
Prior art keywords
film layer
optical film
prism
optical axis
prism portions
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PCT/CN2018/119656
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English (en)
Chinese (zh)
Inventor
康志聪
Original Assignee
惠科股份有限公司
重庆惠科金渝光电科技有限公司
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Publication of WO2020062585A1 publication Critical patent/WO2020062585A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers

Definitions

  • the present application relates to the field of display technology, and in particular, to a polarizer and a display device.
  • Exemplary large-size display panels include an LCD (Liquid Crystal Display) panel and an OLED (Organic Light-Emitting Diode) panel, etc., where the LCD panel includes a VA (Vertical Vertical Alignment) liquid crystal panel and IPS (In-Plane Switching) LCD panels, etc.
  • VA LCD panels have the advantages of higher production efficiency and lower manufacturing costs, but they are more obvious in optical properties than IPS LCD panels. Defective optical properties, especially for large-size panels that require large viewing angles for commercial applications.
  • VA-type LCD panels quickly saturate the brightness at large viewing angles with voltage, which causes the viewing angle image quality contrast and color shift to deteriorate more seriously than the front-view image quality. There is a problem of color cast.
  • the VA liquid crystal technology solves the problem of viewing role deviation by subdividing R (Red, Red), G (Green, Green), and B (Blue, Blue) sub-pixels into primary and secondary pixels, so that the overall large viewing angle brightness changes with voltage. It is closer to the front view.
  • This method of providing different driving voltages to solve the defect of viewing role deviation is given by the primary and secondary pixels in space. It is often necessary to redesign metal traces or switching elements to drive the sub-pixels, causing sacrifices in the light-transmissive opening area. Affects panel penetration.
  • the present application provides a polarizer capable of improving viewing role polarization and having better panel transmittance.
  • a display device is provided.
  • a polarizer includes:
  • the second single optical axis optical film layer includes a plate-shaped portion and a plurality of spaced-apart prism portions formed on one side of the plate-shaped portion, and the plurality of prism portions are housed in the space.
  • a plurality of the prism portions are selected from one of a triangular prism structure and a triangular pyramid structure.
  • the prism portions When a plurality of the prism portions are triangular prism structures, One side surface of the prism portion is attached to the plate-like portion, and when a plurality of the prism portions are triangular pyramid structures, a bottom surface of each of the prism portions is attached to the plate-like portion;
  • a polarizing layer is laminated on a side of the plate-like portion remote from the prism portion.
  • a polarizer includes:
  • the second single optical axis optical film layer includes a plate-shaped portion and a plurality of spaced-apart prism portions formed on one side of the plate-shaped portion, and the plurality of prism portions are housed in the space.
  • a plurality of the prism portions are triangular prism structures, and the plurality of prism portions are arranged in parallel along a straight line, and one side surface of each of the prism portions is in contact with the The plate-shaped portions are abutted, and a distance between two adjacent side edges of the prism portion away from the plate-shaped portion is greater than or equal to two sides of each of the prism portions near the plate-shaped portion. Distance between edges
  • a polarizing layer is laminated on a side of the plate-like portion remote from the prism portion.
  • a display device includes a backlight source, a display panel, and the above-mentioned polarizer, wherein the display panel is located on one side of the backlight source, and the polarizer is located between the display panel and the backlight source; or The polarizer is located on a side of the display panel away from the backlight.
  • FIG. 1 is a schematic structural diagram of a display device according to an embodiment
  • FIG. 2 is a schematic structural diagram of a backlight source of the display device shown in FIG. 1;
  • FIG. 3 is a schematic structural diagram of a polarizer of the display device shown in FIG. 1;
  • FIG. 4 is a schematic structural diagram of a second single optical axis optical film layer of the polarizer shown in FIG. 3;
  • FIG. 5 is a schematic structural view of the second single optical axis optical film layer at another angle shown in FIG. 4;
  • FIG. 6 is a schematic structural view of the second single optical axis optical film layer at another angle shown in FIG. 4;
  • FIG. 7 is a schematic structural diagram of a second single optical axis optical film layer of another embodiment of the polarizer shown in FIG. 3;
  • FIG. 8 is a schematic structural view of the second single optical axis optical film layer of FIG. 7 at another angle;
  • FIG. 9 is a schematic structural view of the second single optical axis optical film layer at another angle shown in FIG. 7;
  • FIG. 10 is a schematic structural diagram of a first single optical axis optical film layer and a second single optical axis optical film layer of the polarizer shown in FIG. 3;
  • FIG. 11 is a schematic structural diagram of a polarizer of another embodiment of the display device shown in FIG. 1;
  • FIG. 12 is a schematic structural diagram of an upper polarizer of the display device shown in FIG. 1.
  • a display device 10 includes a backlight 100, a polarizer 200, a display panel 300, and a polarizer 400.
  • the backlight source 100 is a collimated backlight light source (BL), so that the energy of the light is concentrated and output at a positive viewing angle.
  • BL backlight light source
  • the backlight 100 includes a reflection sheet 110, a light guide plate 120, a prism film 130, and an LED light source 140, and the reflection sheet 110, the light guide plate 120, and the prism film 130 are sequentially stacked.
  • the light surface 121 and the LED light source 140 are disposed opposite to the light incident surface 121.
  • a side of the light guide plate 120 near the reflective sheet 110 is provided with a strip-shaped first groove 122.
  • the cross-section of the first groove 122 is V-shaped and the first concave
  • the extending direction of the groove 122 is perpendicular to the light emitting direction of the LED light source 140.
  • a side of the light guide plate 120 near the prism film 130 is provided with a strip-shaped second groove 123.
  • the cross-section of the second groove 123 is V-shaped, and the second groove The extending direction of 123 is parallel to the light emitting direction of the LED light source 140.
  • the prism side of the prism film 130 is laminated on the light guide plate 120.
  • the polarizer 200 is located on one side of the backlight 100. Specifically, the polarizer 200 includes a first single optical axis optical film layer 210, a second single optical axis optical film layer 220, a polarizing layer 230, a first compensation film layer 240, a first pressure-sensitive adhesive layer 250, and a first protective layer. 260.
  • the first single-optical-axis optical film layer 210 has optical anisotropy, and light passing through the first single-optical-axis optical film layer 210 may cause a birefringence phenomenon.
  • the light rays entering the first single-optical-axis optical film layer 210 can be equivalent to two light rays whose vibration directions are perpendicular to each other.
  • the light rays that are perpendicular to the optical axis of the first single-optical-axis optical film layer 210 are called ordinary rays.
  • O light; light that is parallel to the optical axis of the first single optical axis optical film layer 210 is referred to as extraordinary light, and is referred to as E light.
  • the extraordinary light refractive index (ne1) is the equivalent refractive index of the optical axis of the first single optical axis optical film layer 210 parallel to the direction of electric field vibration;
  • the ordinary light refractive index (no1) is the first single light
  • the material of the first single optical axis optical film layer 210 is a dish-shaped liquid crystal molecular material.
  • the ordinary light refractive index of the first single optical axis optical film layer 210 is 1.0-2.5.
  • the second single optical axis optical film layer 220 is disposed on the first single optical axis optical film layer 210.
  • the second single-optical-axis optical film layer 220 has optical anisotropy, and light passing through the second single-optical-axis optical film layer 220 may cause a birefringence phenomenon.
  • the light rays entering the second single-optical-axis optical film layer 220 can be equivalent to two light rays whose vibration directions are perpendicular to each other.
  • the light rays perpendicular to the optical axis of the second single-optical-axis optical film layer 220 are called ordinary rays.
  • the extraordinary light refractive index (ne2) is an equivalent refractive index of the optical axis of the second single optical axis optical film layer 220 parallel to the electric field vibration direction; the ordinary light refractive index (no2) is the second single light
  • the equivalent refractive index of the optical axis of the axial optical film layer 220 is perpendicular to the direction of electric field vibration.
  • the material of the second single optical axis optical film layer 220 is a nematic liquid crystal molecular material.
  • the extraordinary light refractive index of the second single-optical-axis optical film layer 220 is 1.0 to 2.5, so as to distribute the energy of the front-view light to a large viewing angle.
  • the extraordinary light refractive index of the second single-optical-axis optical film layer 220 is greater than the ordinary light refractive index of the first single-optical-axis optical film layer 210.
  • the difference between the extraordinary refractive index of the second single optical axis optical film layer 220 and the refractive index of the first single optical axis optical film layer 210 is 0.01 to 1.5.
  • the second single optical axis optical film layer 220 includes a plate-shaped portion 221 and a plurality of prism portions 222.
  • the plate-like portion 221 is laminated on the first single-optical-axis optical film layer 210.
  • a plurality of prism portions 222 are formed on one side of the plate-like portion 221 and are disposed at intervals.
  • the plurality of prism portions 222 are housed in the first single optical axis optical film layer 210.
  • the plurality of prism portions 222 are located on the plate-shaped portion 221 on the side of the first single optical axis optical film layer 210.
  • each of the plurality of prism portions 222 is a triangular prism structure or a triangular pyramid structure.
  • each prism portion 222 has a triangular prism structure
  • one side surface of each prism portion 222 is in contact with the plate-shaped portion 221.
  • the plurality of prism portions 222 are arranged in parallel.
  • the plurality of prism portions 222 are arranged in parallel along a straight line, and the distance between the side edges of two adjacent prism portions 222 away from the plate-shaped portion 221 is greater than or equal to that of the prism portion 222 near the plate-shaped portion 221. The distance between two side edges.
  • FIG. 5 and FIG. 6 together.
  • the distance (Px1) between the side edges of two adjacent prism portions 222 away from the plate-shaped portion 221 is greater than or equal to two of the prism portion 222 near the plate-shaped portion 221.
  • the distance (Lx1) between the side edges; D + d is the maximum thickness of the second single optical axis optical film layer 220.
  • the optical axis direction (long axis direction) of the liquid crystal in the single-optical-axis optical film layer 220 is parallel to the light emitting surface or the light incident surface, which may be parallel to the arrangement direction of the plurality of prism portions 222 and perpendicular to each prism portion 222.
  • the extending direction of the prisms may be perpendicular to the arrangement direction of the plurality of prism portions 222 and parallel to the extending direction of each prism portion 222.
  • the transmissive polarization direction of the apparent polarization layer 230 determines the extraordinary light direction refractive index (ne2) and the ordinary light direction refractive index (no2).
  • the optical axis direction (long axis direction) of the liquid crystal in the second single optical axis optical film layer 220 is parallel to the transmission axis direction of the polarizing layer 230, and the optical axis direction (long axis) of the liquid crystal in the second single optical axis optical film layer 220 (Axis direction) is perpendicular to the short axis direction of the liquid crystal in the second single optical axis optical film layer 220. Therefore, the transmission axis direction of the polarizing layer 230 determines the extraordinary light direction refractive index (ne2) and the ordinary light direction refractive index (no2). .
  • each of the plurality of prism portions 222 has a regular triangular prism structure.
  • each prism portion 222 when the plurality of prism portions 222 have a triangular pyramid structure, one bottom surface of each prism portion 222 is in contact with the plate-shaped portion 221.
  • the plurality of prism portions 222 are arranged in a two-dimensional matrix to more effectively distribute the light energy of the positive viewing angle to the two-dimensional direction, so that the viewing angle of the display device 10 is more uniform.
  • FIGS. 7 to 9 please refer to FIGS. 7 to 9 together.
  • Each prism portion 222 has a vertex opposite to the bottom surface, passes through a line between the vertices of two adjacent prism portions 222, and is perpendicular to the two adjacent prism portions.
  • each of the plurality of prism portions 222 is a regular triangular pyramid structure.
  • the polarizing layer 230 is laminated on the plate-shaped portion 221 on the side away from the prism portion 222. Among them, the polarizing layer 230 has the functions of absorbing and transmitting polarized light, and the light intensity can be adjusted with the driving of liquid crystal molecules. Specifically, the polarizing layer 230 is a polyvinyl alcohol (PVA) layer.
  • PVA polyvinyl alcohol
  • the first single optical axis optical film layer 210 and the second single optical axis optical film layer 220 form a flat optical film.
  • the first single-optical-axis optical film layer 210 and the second single-optical-axis optical film layer 220 must have a certain thickness to ensure the weather resistance of the polarizing layer 230, prevent the polarizing layer 230 from contacting the external environment, and prevent moisture from affecting the polarizing layer 230. Make an impact.
  • the extraordinary refractive index (ne2) and ordinary refractive index (no2) of the second single optical axis optical film layer 220 can be selected.
  • the film thickness direction (perpendicular to the light emitting surface) is parallel to the Z axis direction.
  • the principle of allocating light energy with a positive angle of view to a large angle of view is: light propagates from a sparse medium to a light dense medium, that is, light propagates from the first single optical axis optical film layer 210 to the second
  • the single optical axis optical film layer 220 may cause refraction or diffusion due to the difference in refractive index.
  • the multiple prism portions 222 of the second single optical axis optical film layer 220 are all triangular prism structures or triangular pyramid structures, the direction of travel of light The light that is not perpendicular to the interface between the first single optical axis optical film layer 210 and the second single optical axis optical film layer 220 will allow the light energy of the normal viewing angle to be distributed to the side viewing angle, so that the side viewing angle can enjoy the image quality presentation of the positive viewing angle. .
  • the first compensation film layer 240 is laminated on a side of the polarizing layer 230 away from the second single optical axis optical film layer 220. Among them, the first compensation film layer 240 has birefringence, can compensate the polarized light output of the liquid crystal molecules at a large viewing angle, and can also support and protect the polarization layer 230.
  • the first pressure-sensitive adhesive layer 250 is laminated on a side of the first compensation film layer 240 away from the polarizing layer 230.
  • the first protective layer 260 is laminated on a side of the first single optical axis optical film layer 210 away from the second single optical axis optical film layer 220.
  • the first protective layer 260 is a transparent layer, which mainly plays a supporting and protecting role.
  • the first protective layer 260 is an organic material layer. More specifically, the first protective layer 260 is selected from one of a polyethylene terephthalate (PET) layer, a cellulose triacetate layer (TAC), and a polymethyl methacrylate (PMMA) layer.
  • PET polyethylene terephthalate
  • TAC cellulose triacetate layer
  • PMMA polymethyl methacrylate
  • the polarizer 200 is not limited to the above structure, and the first pressure-sensitive adhesive layer 250 layer may be omitted; similarly, the first compensation film layer 240 may be omitted.
  • the polarizer 200 is not limited to the above structure. Please refer to FIG. 11 together.
  • the first protective layer 260 is laminated between the plate-shaped portion 221 and the polarizing layer 230. In one embodiment, the first protective layer 260 may be omitted.
  • the polarizing layer 230 of the polarizer 200 has the function of absorbing and penetrating polarized light.
  • the light entering the polarizer 200 can be divided into horizontal polarization Component light and vertically polarized component light, when the transmission axis of the polarizer 200 is parallel to the arrangement direction of the plurality of prism portions 222, and the absorption axis is parallel to the extending direction of each prism portion 222, the horizontal polarization of the transmission axis is considered.
  • the light of the polarized component passes through the first single optical axis optical film layer 210, and the light of the horizontally polarized component has the equivalent refractive index corresponding to the first single optical axis optical film layer 210, and then passes through the second single optical axis optical film layer 220 ,
  • the extraordinary light refractive index corresponding to the second single optical axis optical film layer 220 is ne2, so the horizontally polarized light undergoes light sparse entry into the light dense medium (ne2> no1) at the interface between the two media. Interface with optically dense medium that is not perpendicular to the direction of light travel Light passes through the interface to produce a refraction effect, so that the positive
  • the transmission axis of the polarizer 200 is parallel to the extending direction of each prism portion 222 and the absorption axis is parallel to the arrangement direction of the plurality of prism portions 222, the light having a vertical polarization component of the transmission axis is considered in the first unit.
  • the single-optical-axis optical film layer 210 has the equivalent refractive index of the first single-optical-axis optical film layer 210 corresponding to the vertically polarized component light, and then passes through the second single-optical-axis optical film layer 220, corresponding to the second single-light
  • the extraordinary optical refractive index of the axial optical film layer 220 is ne2, so the horizontally polarized light enters the optically dense medium (ne2> no1) at the interface between the two media. The interface where the light advances in a vertical direction. Light passes through the interface to produce a refraction effect, so that the positive-angle light type energy distribution has a large viewing angle.
  • the display panel 300 is laminated on a side of the polarizer 200 remote from the backlight 100. In one embodiment, the display panel 300 is laminated on a side of the first pressure-sensitive adhesive layer 250 away from the first compensation film layer 240. Specifically, the display panel 300 is a liquid crystal display panel.
  • the polarizing plate 400 is laminated on a side of the liquid crystal panel 300 away from the polarizer 200. Please refer to FIG. 12 together. Specifically, the polarizing plate 400 includes a second pressure-sensitive adhesive layer 410, a second compensation film layer 420, a polarizing layer 430, a second protective layer 440, an optical film layer 450, and an anti-glare layer that are sequentially stacked. Reflective layer 460.
  • the materials and functions of the second pressure-sensitive adhesive layer 410 and the first pressure-sensitive adhesive layer 250 are approximately the same; the materials and functions of the second compensation film layer 420 and the first compensation film layer 240 are approximately the same; the polarizing layer 430 and the polarizing layer
  • the materials and functions of 230 are substantially the same; the functions of the second protective layer 440 and the first protective layer 260 are substantially the same, and the material of the second protective layer 440 is an organic material layer.
  • the second protective layer 440 is selected from one of a high-temperature-resistant polyethylene terephthalate (PET) layer, a cellulose triacetate layer (TAC), and PMMA; the optical film layer 450 may be as required
  • PET polyethylene terephthalate
  • TAC cellulose triacetate layer
  • the function is to select the corresponding film; the role of the anti-glare low-reflection layer 460 is to prevent glare and reduce the reflection of light to reduce the energy loss of light.
  • the display device 10 is not limited to the above structure, and the polarizing plate 400 in the display device 10 may also be a polarizer 200, that is, the polarizer 200 may also be used as an upper polarizer, and is located on a display panel 300 away from the backlight 100 side.
  • the above display device 10 has at least the following advantages:
  • the above-mentioned polarizer 200 is provided with a second single optical axis optical film layer 220 between the first single optical axis optical film layer 210 and the polarizing layer 230, and an extraordinary optical refractive index of the second single optical axis optical film layer 220 is greater than that of the first single optical axis optical film layer 220.
  • the ordinary light refractive index of the single-optical-axis optical film layer 210 light is transmitted from the first single-optical-axis optical film layer 210 to the second single-optical-axis optical film layer 220. Due to the difference in refractive index, a phenomenon of refraction or diffusion occurs.
  • the multiple prism portions 222 of the two single-optical-axis optical film layers 220 are all triangular prism structures or triangular pyramid structures, and the direction of travel is not the same as the interface between the first single-optical-axis optical film layer 210 and the second single-optical-axis optical film layer 220.
  • the vertical light allows the light energy of the front viewing angle to be distributed to the side viewing angle, so that the side viewing angle can watch the image quality presentation of the front viewing angle, which solves the problem of the large viewing role of the display device 10; at the same time, the display panel 300 does not need to separate the RGB sub-pixels.
  • Pixels are divided into primary and sub-pixel structures, avoiding the need to design metal traces or TFT elements to drive the sub-pixels, causing sacrifices to the transparent opening area and affecting panel penetration. Therefore, the above-mentioned polarizer 200 can not only improve the viewing role polarization, but also has a better panel transmittance.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal (AREA)
  • Polarising Elements (AREA)

Abstract

La présente invention concerne un polariseur (200) qui consiste en un premier film optique uniaxial (210), en un second film optique uniaxial (220) et en une couche de polarisation (230). Le second film optique uniaxial est disposé au-dessus du premier film optique uniaxial. Le second film optique uniaxial présente un indice de réfraction extraordinaire supérieur à un indice de réfraction ordinaire du premier film optique uniaxial. Le second film optique uniaxial comprend une partie plaque (221) et de multiples parties prismes (222) formées sur un côté de la plaque et agencées à des intervalles. Les multiples parties prismes sont reçues dans le premier film optique uniaxial. La partie prisme est sélectionnée parmi une structure de prisme triangulaire et une structure pyramidale triangulaire. La couche de polarisation est fixée à un côté de la partie plaque à l'opposé des parties prismes (222).
PCT/CN2018/119656 2018-09-30 2018-12-07 Polariseur et dispositif d'affichage WO2020062585A1 (fr)

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CN201811161983.1A CN109100825A (zh) 2018-09-30 2018-09-30 偏光片和显示装置
CN201811161983.1 2018-09-30

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CN109633987A (zh) * 2019-01-30 2019-04-16 惠科股份有限公司 光学膜层和显示装置
CN109597240A (zh) * 2019-01-30 2019-04-09 惠科股份有限公司 光学膜层和显示装置
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