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WO2017028326A1 - 防蓝光偏光板及液晶显示面板 - Google Patents

防蓝光偏光板及液晶显示面板 Download PDF

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Publication number
WO2017028326A1
WO2017028326A1 PCT/CN2015/087965 CN2015087965W WO2017028326A1 WO 2017028326 A1 WO2017028326 A1 WO 2017028326A1 CN 2015087965 W CN2015087965 W CN 2015087965W WO 2017028326 A1 WO2017028326 A1 WO 2017028326A1
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Prior art keywords
liquid crystal
cholesteric liquid
handed cholesteric
crystal film
film
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PCT/CN2015/087965
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English (en)
French (fr)
Inventor
韦宏权
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深圳市华星光电技术有限公司
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Priority to US14/786,157 priority Critical patent/US20170153495A1/en
Publication of WO2017028326A1 publication Critical patent/WO2017028326A1/zh

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    • 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
    • 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
    • G02F1/133533—Colour selective polarisers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3016—Polarising elements involving passive liquid crystal elements
    • 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
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • 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
    • G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • 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
    • G02F1/133531—Polarisers characterised by the arrangement of polariser or analyser axes
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/08—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 light absorbing layer
    • G02F2201/086—UV absorbing
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/50—Protective arrangements
    • 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
    • G02F2202/00—Materials and properties
    • G02F2202/02—Materials and properties organic material
    • G02F2202/022—Materials and properties organic material polymeric
    • 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
    • G02F2203/00—Function characteristic
    • G02F2203/05—Function characteristic wavelength dependent
    • G02F2203/055—Function characteristic wavelength dependent wavelength filtering

Definitions

  • the present invention relates to the field of liquid crystal display technology, and in particular, to a blue light-proof polarizing plate and a liquid crystal display panel.
  • LCD liquid crystal display
  • liquid crystal display devices which include a liquid crystal display panel and a backlight module.
  • the liquid crystal display panel is generally composed of a color filter (CF), a thin film transistor array substrate (TFT Array Substrate), and a liquid crystal layer disposed between the two substrates.
  • a polarizing plate is attached to a side of the CF substrate away from the liquid crystal layer, and a polarizing plate is attached to a side of the TFT substrate away from the liquid crystal layer.
  • the liquid crystal display panel controls the orientation of the liquid crystal molecules by the electric field, changes the polarization state of the light, and realizes the penetration and blocking of the optical path by the polarizer, thereby achieving the purpose of display.
  • the backlight module usually uses a Light Emitting Diode (LED) as a backlight.
  • the light emitted by the LED contains blue light that is very harmful to the human body.
  • Blue light refers to high-energy light with a wavelength of 380-480 nm. Its wavelength is short, energy is high, and it can be directly injected into the retina. Long-term accumulation causes eye fatigue, dryness, and decreased vision. At the same time, it is easy to stimulate brown pigment and make the skin grow yellow spots. ,freckle. Therefore, how to prevent Blu-ray has become one of the problems that the display industry needs to solve urgently.
  • the main solution at present is to attach a Blu-ray protection film on the screen, or the user wears anti-Blu-ray glasses, but these two methods will derive other Problems such as reduced screen brightness, inconvenient use, and chromatic aberration.
  • Cholesteric Phase Liquid crystals are a special form of nematic liquid crystal.
  • the molecules 201 of the cholesteric liquid crystal are arranged in a plurality of layers, and the long axes of the molecules 201 are arranged in parallel in each planar layer, but the long-axis orientation of the molecules 201 between the different planar layers is gradually deflected, and the planar layers are respectively
  • the director is twisted layer by layer, and the molecules 201 of the cholesteric liquid crystal are periodically spirally arranged along the normal direction of the plane layer.
  • the normal direction distance corresponding to the long axis orientation of the molecule 201 undergoing a 360° change is referred to as the pitch P.
  • the deflection distortion of the cholesteric liquid crystal may be either a left helix or a right helix, depending on the configuration of the molecule 201.
  • the pitch, n is the average refractive index of the liquid crystal, and n is relatively fixed, so the wavelength of the reflected light of the cholesteric liquid crystal can be controlled by adjusting P.
  • the cholesteric liquid crystal 200 also has a remarkable circular dichroism, and when a beam of light passes through the cholesteric liquid crystal 200, it only follows the Bragg reflection formula and is the same as the spiral direction of the cholesteric liquid crystal 200.
  • the circularly polarized light is reflected, and the remaining light is transmitted through, that is, a beam of light is incident, and the cholesteric liquid crystal 200 reflects the same light in the direction of its rotation, so the reflectance is 50%.
  • the characteristic of selectively reflecting light by cholesteric liquid crystal can effectively reflect blue light and prevent blue light from entering the human eye.
  • Another object of the present invention is to provide a liquid crystal display panel capable of realizing a good anti-blue light effect without reducing the brightness of the screen and causing no chromatic aberration.
  • the present invention firstly provides an anti-blue light polarizing plate comprising at least one left-handed cholesteric liquid crystal film and at least one right-handed cholesteric liquid crystal film; the left-handed cholesteric liquid crystal film and right-handed
  • the cholesteric liquid crystal films are stacked on each other, and the pitch of the left-handed cholesteric liquid crystal in the left-handed cholesteric liquid crystal film and the pitch of the right-handed cholesteric liquid crystal in the right-handed cholesteric liquid crystal film fall within the wavelength range of the blue light. .
  • the pitch of the left-handed cholesteric liquid crystal and the pitch of the right-handed cholesteric liquid crystal are both 380 to 480 nm.
  • the right-handed cholesteric liquid crystal film is stacked on the left-handed cholesteric liquid crystal film.
  • the left-handed cholesteric liquid crystal film is stacked on the right-handed cholesteric liquid crystal film.
  • the anti-blue light polarizing plate further includes a polarizing layer, an upper protective layer and a lower protective layer respectively disposed on the lower surface of the polarizing layer, and a pressure sensitive adhesive layer disposed on the lower surface of the lower protective layer, and disposed at the a release film on the lower surface of the pressure layer; and a surface protection film;
  • a left-handed cholesteric liquid crystal film and a right-handed cholesteric liquid crystal film which are laminated on each other are provided between the surface protective film and the upper protective layer.
  • the material of the polarizing layer is polyvinyl alcohol; the material of the upper protective layer and the lower protective layer is cellulose triacetate.
  • the invention also provides a liquid crystal display panel comprising oppositely disposed color film substrates and array bases a plate, and a liquid crystal layer disposed between the two substrates, a polarizing plate is attached to a side of the color filter substrate away from the liquid crystal layer, and a polarizing plate is attached to a side of the array substrate away from the liquid crystal layer;
  • the upper polarizing plate is a blue light-proof polarizing plate; the anti-blue light polarizing plate comprises at least one left-handed cholesteric liquid crystal film, and at least one right-handed cholesteric liquid crystal film; the left-handed cholesteric liquid crystal film and the right
  • the spin-on-phase liquid crystal films are stacked on each other, and the pitch of the left-handed cholesteric liquid crystal in the left-handed cholesteric liquid crystal film and the pitch of the right-handed cholesteric liquid crystal in the right-handed cholesteric liquid crystal film fall in the wavelength range of the blue light.
  • the pitch of the left-handed cholesteric liquid crystal and the pitch of the right-handed cholesteric liquid crystal are both 380 to 480 nm.
  • the right-handed cholesteric liquid crystal film is stacked on the left-handed cholesteric liquid crystal film or the right-handed cholesteric liquid crystal film is stacked on the left-handed cholesteric liquid crystal film.
  • the anti-blue light polarizing plate further includes a polarizing layer, an upper protective layer and a lower protective layer respectively disposed on the lower surface of the polarizing layer, and a pressure sensitive adhesive layer disposed on the lower surface of the lower protective layer, and disposed at the a release film on the lower surface of the pressure layer; and a surface protection film;
  • a left-handed cholesteric liquid crystal film and a right-handed cholesteric liquid crystal film which are laminated on each other are provided between the surface protective film and the upper protective layer.
  • the invention also provides an anti-blue light polarizing plate comprising at least one left-handed cholesteric liquid crystal film and at least one right-handed cholesteric liquid crystal film; the left-handed cholesteric liquid crystal film and the right-handed cholesteric liquid crystal film Stacked on each other, and the pitch of the left-handed cholesteric liquid crystal in the left-handed cholesteric liquid crystal film and the pitch of the right-handed cholesteric liquid crystal in the right-handed cholesteric liquid crystal film fall within the wavelength range of the blue light;
  • the pitch of the left-handed cholesteric liquid crystal and the pitch of the right-handed cholesteric liquid crystal are both 380-480 nm;
  • a polarizing layer Further comprising a polarizing layer, an upper protective layer and a lower protective layer respectively disposed on the lower surface of the polarizing layer, a pressure sensitive adhesive layer disposed on a lower surface of the lower protective layer, and disposed under the pressure sensitive adhesive layer a release film of the surface, and a surface protective film;
  • a left-handed cholesteric liquid crystal film and a right-handed cholesteric liquid crystal film laminated on each other are disposed between the surface protective film and the upper protective layer;
  • the material of the polarizing layer is polyvinyl alcohol; and the material of the upper protective layer and the lower protective layer is cellulose triacetate.
  • the present invention provides an anti-blue light polarizing plate by providing a left-handed cholesteric liquid crystal film and a right-handed cholesteric liquid crystal film laminated with each other, and a pitch of the left-handed cholesteric liquid crystal and a right-handed cholesteric film.
  • the pitch of the liquid crystal falls within the wavelength range of the blue light, so that the left-handed cholesteric liquid crystal film reflects the left-handed light in the blue light, and the right-handed cholesteric liquid crystal film reflects the right-handed light in the blue light, so that the blue light is completely reflected, and cannot Entering the human eye, it achieves a good anti-blue light effect.
  • the invention provides A liquid crystal display panel is provided with a lower polarizing plate as a common polarizing plate, and the upper polarizing plate is an anti-blue polarizing plate including a left-handed cholesteric liquid crystal film and a right-handed cholesteric liquid crystal film stacked on each other, without additional Adding a layer of anti-blue film can achieve a good anti-blue light effect without reducing the brightness of the screen and producing chromatic aberration.
  • FIG. 1 is a schematic structural view of a conventional cholesteric liquid crystal
  • FIG. 2 is a schematic view showing the principle of the conventional cholesteric liquid crystal having circular dichroism
  • FIG. 3 is a structural block diagram of a blue light-proof polarizing plate of the present invention.
  • FIG. 4 is a schematic view showing the working state of a left-handed cholesteric liquid crystal film and a right-handed cholesteric liquid crystal film in the blue light-proof polarizing plate of the present invention
  • FIG. 5 is a schematic structural view of a liquid crystal display panel of the present invention.
  • the present invention provides a blue light-proof polarizing plate, comprising a polarizing layer 40, an upper protective layer 50 and a lower protective layer 30 respectively disposed on the lower surface of the polarizing layer 40, and a pressure sensitive adhesive layer 20 on the lower surface of the lower protective layer 30, a release film 10 disposed on the lower surface of the pressure sensitive adhesive layer 20, a surface protective film 80, and the surface protective film 80 and the upper protection layer At least one layer of the left-handed cholesteric liquid crystal film 60 and at least one layer of the right-handed cholesteric liquid crystal film 70 between the layers 50.
  • the left-handed cholesteric liquid crystal film means that the spiral direction of the cholesteric liquid crystal in the liquid crystal film is left-handed
  • the right-handed cholesteric liquid crystal film means that the spiral direction of the cholesteric liquid crystal in the liquid crystal film is right-handed.
  • the left-handed cholesteric liquid crystal film 60 and the right-handed cholesteric liquid crystal film 70 are laminated on each other, and the pitch of the left-handed cholesteric liquid crystal in the left-handed cholesteric liquid crystal film 60 and the right-handed cholesteric liquid crystal film 70 are right.
  • the pitch of the cholesteric liquid crystal falls within the wavelength range of blue light.
  • the pitch of the left-handed cholesteric liquid crystal and the pitch of the right-handed cholesteric liquid crystal are both 380 to 480 nm.
  • One method is to add different pitches and polymerizable monomers to the cholesteric liquid crystal to make the cholesteric liquid crystals have different pitch distributions, and then irradiate with ultraviolet light. Polymerizing the polymerizable monomer to fix the cholesteric liquid crystal pitch;
  • One method is to form a spiral gradient of the polymerizable monomer in the system by adding a polymerizable monomer and an ultraviolet absorber to the cholesteric liquid crystal, and utilizing the characteristics of the ultraviolet absorber to absorb ultraviolet light to form an ultraviolet light intensity gradient in the system.
  • the polymer network near the ultraviolet light after polymerization is high in content, the chiral agent is small, the pitch of the cholesteric liquid crystal is large, the opposite side, the polymer network content is low, the chiral agent is large, and the pitch of the cholesteric liquid crystal is small. .
  • the material of the polarizing layer 40 is polyvinyl alcohol (PVA); the material of the upper protective layer 50 and the lower protective layer 30 is triacetate cellulose (TAC).
  • PVA polyvinyl alcohol
  • TAC triacetate cellulose
  • the right-handed cholesteric liquid crystal film 70 may be stacked on the left-handed cholesteric liquid crystal film 60 as shown in FIGS. 3 and 4.
  • the left-handed cholesteric liquid crystal film 60 may be stacked on the right-handed cholesteric liquid crystal film 70.
  • a layer of right-handed cholesteric liquid crystal film 70 stacked on a layer of left-handed cholesteric liquid crystal film 60 as an example, as shown in FIG. 4, since a cholesteric liquid crystal has a remarkable circular dichroism, when a blue light is incident First, the left-handed cholesteric liquid crystal film 60 reflects the left-handed light in the blue light, and the remaining right-handed light in the blue light is transmitted into the right-handed cholesteric liquid crystal stacked on the left-handed cholesteric liquid crystal film 60.
  • the liquid crystal film 70 is emitted into the human eye to achieve a good anti-blue light effect.
  • the present invention further provides a liquid crystal display comprising a color film substrate 1 and an array substrate 2 disposed opposite to each other, and a liquid crystal layer 3 disposed between the two substrates.
  • the polarizing plate 4 is attached to the side of the color filter substrate 1 remote from the liquid crystal layer 3, and the polarizing plate 5 is attached to the side of the array substrate 2 away from the liquid crystal layer 3.
  • the lower polarizing plate 5 is a common polarizing plate
  • the upper polarizing plate 4 is the anti-blue polarizing plate shown in FIG. 3 and FIG. 4 above.
  • the structure and working process of the anti-blue polarizing plate are not repeatedly described here. .
  • the liquid crystal display of the present invention is provided with a lower polarizing plate 5 as a common polarizing plate
  • the upper polarizing plate 4 is a blue-light-proof polarizing plate including a left-handed cholesteric liquid crystal film 60 and a right-handed cholesteric liquid crystal film 70 which are laminated one on another. There is no need to add an additional layer of anti-blue film, which can achieve good anti-blue light effect without reducing the screen brightness and chromatic aberration.
  • the anti-blue light polarizing plate of the present invention has a left-handed cholesteric liquid crystal film and a right-handed cholesteric liquid crystal film which are laminated on each other, and the pitch of the left-handed cholesteric liquid crystal and the pitch of the right-handed cholesteric liquid crystal. All fall within the wavelength range of blue light, so that the left-handed cholesteric liquid crystal film reflects the left-handed light in the blue light, and the right-handed cholesteric liquid crystal film reflects the right-handed light in the blue light, so that the blue light is totally reflected and cannot enter the human eye. A good anti-blue light effect is achieved.
  • the invention provides a liquid crystal display panel, wherein the lower polarizing plate is a common polarizing plate, and the upper polarizing plate comprises a left-handed layer which is laminated on each other.
  • the anti-blue polarizing plate of the cholesteric liquid crystal film and the right-handed cholesteric liquid crystal film does not need to add an additional anti-blue film, and can achieve a good anti-blue light effect without reducing the screen brightness and chromatic aberration.

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

Abstract

一种防蓝光偏光板及液晶显示面板。该防蓝光偏光板包括至少一层左旋胆甾相液晶膜（60）、及至少一层右旋胆甾相液晶膜（70）；所述左旋胆甾相液晶膜（60）与右旋胆甾相液晶膜（70）相互层叠，且所述左旋胆甾相液晶膜（60）内左旋胆甾相液晶的螺距与右旋胆甾相液晶膜（70）内右旋胆甾相液晶的螺距均落在蓝光的波长范围内，使得左旋胆甾相液晶膜（60）反射蓝光中的左旋光、右旋胆甾相液晶膜（70）反射蓝光中的右旋光，从而使蓝光全部被反射，不能进入人眼，达到了良好的防蓝光效果。一种液晶显示面板，设置其上偏光板（4）为包括了相互层叠的左旋胆甾相液晶膜（60）与右旋胆甾相液晶膜（70）的防蓝光偏光板，实现了良好的防蓝光效果。

Description

防蓝光偏光板及液晶显示面板 技术领域
本发明涉及液晶显示技术领域，尤其涉及一种防蓝光偏光板及液晶显示面板。
背景技术
随着电子科技以及显示技术的迅猛发展，液晶显示装置(Liquid Crystal Display，LCD)得到了广泛的应用，如：液晶电视、智能手机、电脑屏幕等。
现有市场上的液晶显示装置大部分为背光型液晶显示装置，其包括液晶显示面板及背光模组(Backlight module)。
液晶显示面板通常是由一彩膜基板(Color Filter，CF)、一薄膜晶体管阵列基板(Thin Film Transistor Array Substrate，TFT Array Substrate)以及一配置于两基板间的液晶层(Liquid Crystal Layer)所构成，CF基板远离液晶层的一侧贴附一偏光板，TFT基板远离液晶层的一侧也贴附一偏光板。液晶显示面板通过电场对液晶分子的取向进行控制，改变光的偏振状态，并藉由偏光片实现光路的穿透与阻挡，达到显示的目的。
背光模组通常以发光二极管(Light Emitting Diode，LED)作为背光源。LED发出的光包含对人体伤害非常大的蓝光。蓝光指的是波长为380～480nm的高能光，其波长短、能量高、能够直接射入视网膜中，长期积累造成眼睛疲劳、干涩、视力下降，同时还容易激发褐色色素，使皮肤长出黄斑、雀斑。因此，如何防蓝光成为了显示行业亟待解决的问题之一，目前的主要解决方法是在屏幕上贴附防蓝光保护贴膜，或者用户佩戴防蓝光眼镜，但这两种方法会衍生出其它的一些问题，例如屏幕亮度降低、使用不便、产生色差等问题。
胆甾相(Cholesteric Phase)液晶是向列型液晶的一种特殊形式。如图1所示，胆甾相液晶的分子201排列成多层，在每个平面层内分子201的长轴平行排列，但不同平面层之间分子201的长轴取向逐渐偏转，各平面层的指向矢逐层扭曲，胆甾相液晶的分子201沿平面层的法线方向呈周期性螺旋排列。分子201的长轴取向经历360°变化所对应的法线方向距离称作螺距P。胆甾相液晶的偏转扭曲可以是左螺旋，也可以是右螺旋，这取决于分子201构造的不同。
由于胆甾相液晶特殊的螺旋状结构，其具有布拉格反射特性，即当入射光的波长满足λ＝nP时，入射光将被反射，其中λ为反射光的波长，P为胆甾相液晶的螺距，n为液晶的平均折射率，n相对固定，因此可通过调节P来控制胆甾相液晶反射光的波长。
同时，如图2所示，胆甾相液晶200还具有明显的圆二色性，当一束光通过胆甾相液晶200时，只有遵循布拉格反射公式并且与胆甾相液晶200的螺旋方向相同的圆偏振光被反射出去，其余的光则被透射过去，也就是说一束光入射，胆甾相液晶200会反射与其旋光方向相同的光，故反射率为50％。利用胆甾相液晶对光进行选择性反射的这一特性，可以有效地将蓝光反射掉，使蓝光不能进入人眼。
发明内容
本发明的目的在于提供一种防蓝光偏光板，其利用胆甾相液晶对光进行选择性反射的这一特性有效地将蓝光反射掉，使蓝光不能进入人眼，达到良好的防蓝光效果。
本发明的另一目的在于提供一种液晶显示面板，能够在不降低屏幕亮度、不产生色差的前提下，实现良好的防蓝光效果。
为实现上述目的，本发明首先提供一种防蓝光偏光板，包括至少一层左旋胆甾相液晶膜、及至少一层右旋胆甾相液晶膜；所述左旋胆甾相液晶膜与右旋胆甾相液晶膜相互层叠，且所述左旋胆甾相液晶膜内左旋胆甾相液晶的螺距与右旋胆甾相液晶膜内右旋胆甾相液晶的螺距均落在蓝光的波长范围内。
所述左旋胆甾相液晶的螺距与右旋胆甾相液晶的螺距均为380～480nm。
可选的，所述右旋胆甾相液晶膜叠放于所述左旋胆甾相液晶膜上。
可选的，所述左旋胆甾相液晶膜叠放于所述右旋胆甾相液晶膜上。
所述防蓝光偏光板还包括一偏光层、分别设于所述偏光层上、下表面的上保护层与下保护层、设于所述下保护层下表面的感压胶层、设于所述感压胶层下表面的离型膜、以及一表面保护膜；
相互层叠的左旋胆甾相液晶膜与右旋胆甾相液晶膜设于所述表面保护膜和上保护层之间。
所述偏光层的材料为聚乙烯醇；所述上保护层与下保护层的材料为三醋酸纤维素。
本发明还提供一种液晶显示面板，包括相对设置的彩膜基板与阵列基 板、及配置于两基板间的液晶层，所述彩膜基板远离液晶层的一侧贴附上偏光板，阵列基板远离液晶层的一侧贴附下偏光板；
所述上偏光板为防蓝光偏光板；所述防蓝光偏光板包括至少一层左旋胆甾相液晶膜、及至少一层右旋胆甾相液晶膜；所述左旋胆甾相液晶膜与右旋胆甾相液晶膜相互层叠，且所述左旋胆甾相液晶膜内左旋胆甾相液晶的螺距与右旋胆甾相液晶膜内右旋胆甾相液晶的螺距均落在蓝光的波长范围内。
所述左旋胆甾相液晶的螺距与右旋胆甾相液晶的螺距均为380～480nm。
所述右旋胆甾相液晶膜叠放于所述左旋胆甾相液晶膜上或所述右旋胆甾相液晶膜叠放于所述左旋胆甾相液晶膜上。
所述防蓝光偏光板还包括一偏光层、分别设于所述偏光层上、下表面的上保护层与下保护层、设于所述下保护层下表面的感压胶层、设于所述感压胶层下表面的离型膜、以及一表面保护膜；
相互层叠的左旋胆甾相液晶膜与右旋胆甾相液晶膜设于所述表面保护膜和上保护层之间。
本发明还提供一种防蓝光偏光板，包括至少一层左旋胆甾相液晶膜、及至少一层右旋胆甾相液晶膜；所述左旋胆甾相液晶膜与右旋胆甾相液晶膜相互层叠，且所述左旋胆甾相液晶膜内左旋胆甾相液晶的螺距与右旋胆甾相液晶膜内右旋胆甾相液晶的螺距均落在蓝光的波长范围内；
其中，所述左旋胆甾相液晶的螺距与右旋胆甾相液晶的螺距均为380～480nm；
还包括一偏光层、分别设于所述偏光层上、下表面的上保护层与下保护层、设于所述下保护层下表面的感压胶层、设于所述感压胶层下表面的离型膜、以及一表面保护膜；
相互层叠的左旋胆甾相液晶膜与右旋胆甾相液晶膜设于所述表面保护膜和上保护层之间；
其中，所述偏光层的材料为聚乙烯醇；所述上保护层与下保护层的材料为三醋酸纤维素。
本发明的有益效果：本发明提供的一种防蓝光偏光板，通过设置相互层叠的左旋胆甾相液晶膜与右旋胆甾相液晶膜，且左旋胆甾相液晶的螺距与右旋胆甾相液晶的螺距均落在蓝光的波长范围内，使得左旋胆甾相液晶膜反射蓝光中的左旋光、右旋胆甾相液晶膜反射蓝光中的右旋光，从而使蓝光全部被反射，不能进入人眼，达到了良好的防蓝光效果。本发明提供 的一种液晶显示面板，设置其下偏光板为普通偏光板，其上偏光板为包括了相互层叠的左旋胆甾相液晶膜与右旋胆甾相液晶膜的防蓝光偏光板，不需要额外增加一层防蓝光膜，能够在不降低屏幕亮度、不产生色差的前提下，实现良好的防蓝光效果。
附图说明
为了能更进一步了解本发明的特征以及技术内容，请参阅以下有关本发明的详细说明与附图，然而附图仅提供参考与说明用，并非用来对本发明加以限制。
附图中，
图1为现有的胆甾相液晶的结构示意图；
图2为现有的胆甾相液晶具有圆二色性的原理示意图；
图3为本发明的防蓝光偏光板的结构框图；
图4为本发明的防蓝光偏光板中左旋胆甾相液晶膜与右旋胆甾相液晶膜的工作状态示意图；
图5为本发明的液晶显示面板的结构示意图。
具体实施方式
为更进一步阐述本发明所采取的技术手段及其效果，以下结合本发明的优选实施例及其附图进行详细描述。
请同时参阅图3与图4，本发明提供一种防蓝光偏光板，包括一偏光层40、分别设于所述偏光层40上、下表面的上保护层50与下保护层30、设于所述下保护层30下表面的感压胶层20、设于所述感压胶层20下表面的离型膜10、一表面保护膜80、以及设于所述表面保护膜80和上保护层50之间的至少一层左旋胆甾相液晶膜60与至少一层右旋胆甾相液晶膜70。所谓左旋胆甾相液晶膜是说该液晶膜内的胆甾相液晶的螺旋方向为左旋，所谓右旋胆甾相液晶膜是说该液晶膜内的胆甾相液晶的螺旋方向为右旋。
所述左旋胆甾相液晶膜60与右旋胆甾相液晶膜70相互层叠，且所述左旋胆甾相液晶膜60内左旋胆甾相液晶的螺距与右旋胆甾相液晶膜70内右旋胆甾相液晶的螺距均落在蓝光的波长范围内。
具体地，所述左旋胆甾相液晶的螺距与右旋胆甾相液晶的螺距均为380～480nm。不同螺距的实现方法有两种：一种方法是通过在胆甾相液晶中加入不同性质的手性剂和可聚合单体，使胆甾相液晶具有不同的螺距分布，再经紫外光照射，使可聚合单体发生聚合反应，固定胆甾相液晶螺距；另 一种方法是通过在胆甾相液晶中加入可聚合单体和紫外吸收剂，利用紫外吸收剂吸收紫外光的特性在体系内形成紫外光强度梯度，诱导可聚合单体在体系内形成螺旋梯度，聚合后靠近紫外光的聚合物网络含量高，手性剂少，胆甾相液晶的螺距大，相对的另一侧，聚合物网络含量低，手性剂多，胆甾相液晶的螺距小。
所述偏光层40的材料为聚乙烯醇(polyvinyl alcohol，PVA)；所述上保护层50与下保护层30的材料为三醋酸纤维素(Triacetate cellulose，TAC)。
所述右旋胆甾相液晶膜70可以如图3、图4所示的那样叠放于所述左旋胆甾相液晶膜60上。当然，所述述左旋胆甾相液晶膜60也可以叠放于所述右旋胆甾相液晶膜70上。
以一层右旋胆甾相液晶膜70叠放于一层左旋胆甾相液晶膜60为例，如图4所示，由于胆甾相液晶具有明显的圆二色性，当一束蓝光入射时，首先左旋胆甾相液晶膜60将该束蓝光中的左旋光反射，蓝光中其余的右旋光则透射进入叠放于所述左旋胆甾相液晶膜60上的右旋胆甾相液晶膜70，右旋胆甾相液晶膜70接着对蓝光中的右旋光进行反射，从而使得该束蓝光全部被反射，而无法透过层叠的左旋胆甾相液晶膜60与右旋胆甾相液晶膜70射出进入人眼，达到了良好的防蓝光效果。
请参阅图5，在上述防蓝光偏光板的基础上，本发明还提供一种液晶显示器，包括相对设置的彩膜基板1与阵列基板2、及配置于两基板间的液晶层3，所述彩膜基板1远离液晶层3的一侧贴附上偏光板4，阵列基板2远离液晶层3的一侧贴附下偏光板5。
所述下偏光板5为普通偏光板，所述上偏光板4为上述如图3、图4所示的防蓝光偏光板，此处不再对防蓝光偏光板的结构与工作过程进行重复描述。
由于本发明的液晶显示器设置其下偏光板5为普通偏光板，其上偏光板4为包括了相互层叠的左旋胆甾相液晶膜60与右旋胆甾相液晶膜70的防蓝光偏光板，不需要额外增加一层防蓝光膜，能够在不降低屏幕亮度、不产生色差的前提下，实现良好的防蓝光效果。
综上所述，本发明的防蓝光偏光板，通过设置相互层叠的左旋胆甾相液晶膜与右旋胆甾相液晶膜，且左旋胆甾相液晶的螺距与右旋胆甾相液晶的螺距均落在蓝光的波长范围内，使得左旋胆甾相液晶膜反射蓝光中的左旋光、右旋胆甾相液晶膜反射蓝光中的右旋光，从而使蓝光全部被反射，不能进入人眼，达到了良好的防蓝光效果。本发明提供的一种液晶显示面板，设置其下偏光板为普通偏光板，其上偏光板为包括了相互层叠的左旋 胆甾相液晶膜与右旋胆甾相液晶膜的防蓝光偏光板，不需要额外增加一层防蓝光膜，能够在不降低屏幕亮度、不产生色差的前提下，实现良好的防蓝光效果。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明后附的权利要求的保护范围。

Claims (13)

  1. 一种防蓝光偏光板，包括至少一层左旋胆甾相液晶膜、及至少一层右旋胆甾相液晶膜；所述左旋胆甾相液晶膜与右旋胆甾相液晶膜相互层叠，且所述左旋胆甾相液晶膜内左旋胆甾相液晶的螺距与右旋胆甾相液晶膜内右旋胆甾相液晶的螺距均落在蓝光的波长范围内。
  2. 如权利要求1所述的防蓝光偏光板，其中，所述左旋胆甾相液晶的螺距与右旋胆甾相液晶的螺距均为380～480nm。
  3. 如权利要求1所述的防蓝光偏光板，其中，所述右旋胆甾相液晶膜叠放于所述左旋胆甾相液晶膜上。
  4. 如权利要求1所述的防蓝光偏光板，其中，所述左旋胆甾相液晶膜叠放于所述右旋胆甾相液晶膜上。
  5. 如权利要求1所述防蓝光偏光板，还包括一偏光层、分别设于所述偏光层上、下表面的上保护层与下保护层、设于所述下保护层下表面的感压胶层、设于所述感压胶层下表面的离型膜、以及一表面保护膜；
    相互层叠的左旋胆甾相液晶膜与右旋胆甾相液晶膜设于所述表面保护膜和上保护层之间。
  6. 如权利要求5所述防蓝光偏光板，其中，所述偏光层的材料为聚乙烯醇；所述上保护层与下保护层的材料为三醋酸纤维素。
  7. 一种液晶显示面板，包括相对设置的彩膜基板与阵列基板、及配置于两基板间的液晶层，所述彩膜基板远离液晶层的一侧贴附上偏光板，阵列基板远离液晶层的一侧贴附下偏光板；
    所述上偏光板为防蓝光偏光板；所述防蓝光偏光板包括至少一层左旋胆甾相液晶膜、及至少一层右旋胆甾相液晶膜；所述左旋胆甾相液晶膜与右旋胆甾相液晶膜相互层叠，且所述左旋胆甾相液晶膜内左旋胆甾相液晶的螺距与右旋胆甾相液晶膜内右旋胆甾相液晶的螺距均落在蓝光的波长范围内。
  8. 如权利要求7所述的液晶显示面板，其中，所述左旋胆甾相液晶的螺距与右旋胆甾相液晶的螺距均为380～480nm。
  9. 如权利要求7所述的液晶显示面板，其中，所述右旋胆甾相液晶膜叠放于所述左旋胆甾相液晶膜上或所述右旋胆甾相液晶膜叠放于所述左旋胆甾相液晶膜上。
  10. 如权利要求9所述的液晶显示面板，其中，所述防蓝光偏光板还 包括一偏光层、分别设于所述偏光层上、下表面的上保护层与下保护层、设于所述下保护层下表面的感压胶层、设于所述感压胶层下表面的离型膜、以及一表面保护膜；
    相互层叠的左旋胆甾相液晶膜与右旋胆甾相液晶膜设于所述表面保护膜和上保护层之间。
  11. 一种防蓝光偏光板，包括至少一层左旋胆甾相液晶膜、及至少一层右旋胆甾相液晶膜；所述左旋胆甾相液晶膜与右旋胆甾相液晶膜相互层叠，且所述左旋胆甾相液晶膜内左旋胆甾相液晶的螺距与右旋胆甾相液晶膜内右旋胆甾相液晶的螺距均落在蓝光的波长范围内；
    其中，所述左旋胆甾相液晶的螺距与右旋胆甾相液晶的螺距均为380～480nm；
    还包括一偏光层、分别设于所述偏光层上、下表面的上保护层与下保护层、设于所述下保护层下表面的感压胶层、设于所述感压胶层下表面的离型膜、以及一表面保护膜；
    相互层叠的左旋胆甾相液晶膜与右旋胆甾相液晶膜设于所述表面保护膜和上保护层之间；
    其中，所述偏光层的材料为聚乙烯醇；所述上保护层与下保护层的材料为三醋酸纤维素。
  12. 如权利要求11所述的防蓝光偏光板，其中，所述右旋胆甾相液晶膜叠放于所述左旋胆甾相液晶膜上。
  13. 如权利要求11所述的防蓝光偏光板，其中，所述左旋胆甾相液晶膜叠放于所述右旋胆甾相液晶膜上。
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