WO2018214611A1 - Module de rétro-éclairage et dispositif d'affichage à cristaux liquides - Google Patents

Module de rétro-éclairage et dispositif d'affichage à cristaux liquides Download PDF

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Publication number
WO2018214611A1
WO2018214611A1 PCT/CN2018/078158 CN2018078158W WO2018214611A1 WO 2018214611 A1 WO2018214611 A1 WO 2018214611A1 CN 2018078158 W CN2018078158 W CN 2018078158W WO 2018214611 A1 WO2018214611 A1 WO 2018214611A1
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WO
WIPO (PCT)
Prior art keywords
backlight
light
backlight module
liquid crystal
reflective
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Application number
PCT/CN2018/078158
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English (en)
Chinese (zh)
Inventor
李富琳
宋志成
刘卫东
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青岛海信电器股份有限公司
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Publication of WO2018214611A1 publication Critical patent/WO2018214611A1/fr

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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
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • 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
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members

Definitions

  • the present disclosure relates to the field of liquid crystal display, and in particular, to a backlight module and a liquid crystal display device.
  • the liquid crystal display usually includes a backlight module and a liquid crystal panel which are sequentially disposed.
  • the liquid crystal panel is a passive light-emitting component, which does not emit light by itself, and requires a backlight module to provide a backlight with sufficient brightness to realize the display function of the liquid crystal display device.
  • the present disclosure provides a backlight module, the backlight module includes: a plurality of light emitting modules, each of the plurality of light emitting modules includes a backlight component and a corresponding one of the backlight components
  • Light collimation structure includes at least one backlight source.
  • the light collimating structure includes a converging turning member and a reflecting member.
  • the converging steering member includes a light transmissive component body, and a surface of the body remote from the at least one backlight source includes a reflective surface, the reflective surface is configured to direct at least a portion of the light emitted by the at least one backlight source The plane reflection of the backlight element.
  • the reflective member is disposed around the converging steering member, and the reflective member includes a curved surface for reflecting light reflected by the reflective surface.
  • the present disclosure provides a liquid crystal display device including the above-described backlight module and liquid crystal panel.
  • the liquid crystal panel includes a liquid crystal layer and a quantum dot color conversion layer, and the liquid crystal layer is disposed between the backlight module and the quantum dot color conversion layer.
  • the liquid crystal layer includes a plurality of liquid crystal cells, and the quantum dot color conversion layer includes a plurality of quantum dot units, and the plurality of quantum dot units are disposed corresponding to the plurality of liquid crystal cells.
  • FIG. 1 is a schematic structural view of a liquid crystal display
  • FIG. 2 is a schematic diagram showing a distribution of backlight light emitted by a backlight source
  • FIG. 3 is a schematic structural diagram of a backlight module according to some embodiments of the present disclosure.
  • FIG. 4 is a schematic structural diagram of a light emitting module according to some embodiments of the present disclosure.
  • FIG. 5 is a schematic diagram of a parabolic reflection principle provided by some embodiments of the present disclosure.
  • FIG. 6 is a schematic diagram of an optical path of a backlight according to some embodiments of the present disclosure.
  • FIG. 7 is a schematic structural diagram of another light emitting module according to some embodiments of the present disclosure.
  • FIG. 8 is a schematic diagram of an optical path of another backlight according to some embodiments of the present disclosure.
  • FIG. 9 is a schematic structural diagram of a liquid crystal display device according to some embodiments of the present disclosure.
  • the liquid crystal display includes a backlight module 10 and a liquid crystal panel 20.
  • the backlight module includes a plurality of LED blue backlights 11 that are evenly distributed.
  • the liquid crystal panel 20 includes a liquid crystal layer 21 and a quantum dot color conversion layer 22.
  • the liquid crystal layer 21 includes a plurality of liquid crystal cells 211 arranged in order.
  • the quantum dot color conversion layer 22 includes a plurality of quantum dot conversion groups 221 arranged in order, each quantum dot conversion group 221 being composed of a red quantum dot unit, a green quantum dot unit, and a blank quantum dot unit arranged in order.
  • Each of the quantum dot conversion units is disposed corresponding to one liquid crystal cell 211.
  • the blue backlight enters the liquid crystal layer 21, and the liquid crystals in the respective liquid crystal cells 211 in the liquid crystal layer 21 can be rearranged according to display requirements, thereby changing the luminous flux of the blue backlight through the respective liquid crystal cells 211.
  • the blue backlight passing through the liquid crystal layer 21 enters the quantum dot color conversion layer 22, and each of the quantum dot conversion groups 221 can emit three primary color backlights corresponding to the respective quantum dot conversion units.
  • the backlights of the three primary colors with different luminous fluxes can be reconciled to obtain the color of a corresponding pixel. Displaying pixels of different colors on the screen together can form an image to be displayed.
  • the emission angle of the LED backlight is usually large, and the inventors have found that the backlight passing through the liquid crystal cell easily enters into other quantum dot conversion units other than the corresponding quantum dot conversion unit.
  • a large angle blue backlight can enter the adjacent red quantum dot unit and the blank quantum dot unit through the liquid crystal cell, which is correspondingly obtained.
  • a small amount of red backlight and blue backlight cause the color purity of the green backlight corresponding to the green quantum dot unit to decrease, and the color crosstalk between the three primary color backlights affects the display effect of the liquid crystal display.
  • FIG. 2 is a schematic diagram showing the distribution of backlight light emitted by a backlight source used in the research process.
  • the exit angle of the backlight light is usually distributed in a wide range, and backlight light is emitted between ⁇ 90° centered on the center line of the backlight source.
  • FIG. 3 is a schematic structural diagram of a backlight module according to some embodiments of the present disclosure.
  • FIG. 4 is a schematic structural diagram of a light emitting module according to some embodiments of the present disclosure.
  • the backlight module of the present disclosure includes: a plurality of light emitting modules 100 , each of the plurality of light emitting modules 100 includes a backlight component 200 , and a light collimating structure corresponding to the backlight component 200 . 300.
  • the backlight element 200 includes at least one backlight source 210. In some embodiments, only one backlight source 210 is typically included within backlight element 200.
  • the backlight element 200 is for providing a backlight having sufficient brightness to realize a display function of the liquid crystal display device.
  • the same arrangement direction means that the light-emitting surfaces of the plurality of light-emitting modules 100 all face the same direction.
  • the backlight source may be an LED or a light-emitting chip.
  • the LED may refer to LEDs in the related art, and generally includes a light-emitting chip, a phosphor, and a package housing.
  • the optical collimating structure 300 is disposed in the light emitting direction of the backlight element 200 in some embodiments.
  • the backlight module is a direct-lit backlight module
  • the direct-lit backlight module includes a back plate, a diffusion plate, and an optical film.
  • the light-emitting module is disposed on the back plate, and the light-emitting surface of the light-emitting module faces the diffusion.
  • the plate, the optical film is disposed on a side of the diffuser plate away from the back plate.
  • each of the light collimating structures 300 includes a converging turning member 310 and a reflecting member 320 that are symmetrically disposed about the converging turning member 310.
  • the entire light collimating structure 300 may be a circumferentially symmetrical structure or a square structure.
  • the convergence steering member 310 includes a lens having a tapered surface disposed thereon for reflecting at least a portion of the light emitted by the backlight element 200 toward a plane in which the backlight element 200 is located, and the backlight element All of the light from the light emitted by 200 is reflected toward the plane of the backlight element 200.
  • the reflective member 320 includes at least one curved reflecting surface that receives the conical reflecting surface reflection at the top of the converging turning member 310. Light rays and reflect the light they receive away from the backplane.
  • the generatrix of the tapered face is a straight line in a cross-sectional view along an axis of symmetry passing through the apex of the tapered face, and in some embodiments, the straight line is symmetrical with the apex of the tapered face
  • the angle of the shaft is greater than 30°.
  • the generatrix of the tapered face is a curve that projects toward the axis of symmetry passing through the apex of the tapered face in a cross-sectional view along the axis of symmetry passing through the apex of the tapered face.
  • the convergence steering component 310 includes a tapered reflective surface for reflecting light emitted by the backlight element 200 toward a plane in which the backlight element 200 is located, the reflective component 320 including at least one curved reflective surface.
  • the curved reflecting surface receives the light reflected by the tapered reflecting surface and reflects the received light toward the direction away from the back plate.
  • the tapered reflecting surface may be formed after coating a reflective layer on the tapered surface of the lens.
  • the light-emitting angle of the reflective member 320 is smaller than the light-emitting angle of the backlight element 200, and the light-emitting angle of the reflective member refers to a maximum angle formed by the light reflected by the reflective member.
  • the convergence steering component 310 includes a component body 311 of a highly transmissive material.
  • a surface of the light-transmitting component body 311 is provided with a recess 312, and the backlight element 200 is located in the recess 312.
  • the surface on which the groove 312 is provided is set to converge the bottom surface of the steering member 310, and the upper and lower positional relationships of the other members are based on this.
  • the bottom surface may be a plane in which the backlight element 200 is located.
  • Another face (top face) of the component body 311 opposite the recess 312 includes a reflective surface for reflecting the backlight to the reflective component.
  • the reflective surface includes an inverted tapered surface, i.e., the other surface of the component body 311 opposite the recess 312 has a cross-section like a V-like structure 313 for reflecting the backlight.
  • the component body 311 is a regular body such as a straight quadrangular cylinder or a cylinder to facilitate the arrangement of the groove 312 and the V-like structure reflecting surface and the stabilization of the converging steering member 310.
  • the component body 311 may also be an irregular body as long as the groove 312 and the V-shaped structure reflecting surface can be respectively disposed on opposite sides of the component body 311.
  • the backlight element 200 and the bottom surface of the body 311 are disposed on the backplane of the backlight module, and in some embodiments, further include a PCB board on which the backlight component 200 is mounted, the PCB board is fixed. On the backplane of the backlight module, the PCB board and the backlight element 200 together form a light bar, and the bottom surface of the body 311 is disposed on a side of the PCB board on which the backlight element 200 is disposed.
  • the cross-sectional shape of the cavity formed by the recess 312 is not limited, and may be a vertical surface, or a bevel or an irregular curved surface; the bottom surface of the recess 312 (ie, when After the backlight element is placed in the recess, the surface of the recess opposite to the backlight element is a smooth convex surface 314, and the convex surface 314 is the plane of the bottom surface of the recess 312 from the bottom surface of the body 311. The distance is smaller than the distance between the surrounding area of the bottom surface of the groove 312 and the plane of the bottom surface of the body 311.
  • the open line segments formed by connecting any two points on the convex surface 314 are all inside the body 311.
  • the convex surface 314 has a converging effect on the backlight light emitted from the backlight element 200, and the backlight light having a larger emission angle can be concentrated near the apex of the V-shaped structure 313.
  • the reflective surface of the component body 311 is comprised of an inverted tapered surface to which a reflective coating 315 is adhered.
  • the backlight light emitted from the V-shaped structure through the convex surface 314 faces the tapered surface of the reflecting surface of the component body 311, and is reflected on the tapered surface to reach the reflecting member 320.
  • the reflective coating 315 is coated with a reflective coating, which typically consists of a binder, a heat reflective pigment, a filler, and an adjuvant.
  • the type and nature of the reflective coating are not specifically limited, and any of the existing coatings capable of efficiently reflecting sunlight may be used.
  • the centers of symmetry of the two planes are the same as the center of symmetry of the reflecting members, that is, both are centered on the center plane of the converging turning member 310 in the vertical direction.
  • the axis of symmetry of the tapered face, the axis of symmetry of the convex face, the axis of symmetry of the body, and the axis of symmetry of the converging steering member are the same axis that is perpendicular to the bottom surface.
  • the reflective component 320 further includes a paraboloid 321 for reflecting the backlight
  • the paraboloid 321 may be formed of a white reflective material, such as a PC (polycarbonate) material; or a PMMA having a reflective coating on its surface. (polymethyl methacrylate) material. Taking the vertex of the paraboloid as the origin, the paraboloid satisfies the following relationship:
  • the focus of the paraboloid 321 may coincide with the apex of a V-like structure 313 (ie, a tapered surface). As shown in FIG. 4, the position of the focus of the paraboloid 321 satisfies the following relationship:
  • u is the distance from the surface of the backlight source 210 near the convex surface 314 to the apex of the convex surface 314, v is the distance from the vertex of the convex surface 314 to the apex of the V-like structure 313, and y is the parabola 321 focus is in the vertical direction. s position.
  • FIG. 5 is a schematic diagram of a parabolic reflection principle provided by some embodiments of the present disclosure.
  • the light incident on the parallel axis is concentrated by the parabolic surface and then concentrated on the focal point of the paraboloid.
  • the reversible principle of the optical path after the light emitted by the parabolic focus is reflected on the paraboloid, the light will be emitted parallel to the axis.
  • FIG. 6 is a schematic diagram of an optical path of a backlight according to some embodiments of the present disclosure.
  • the backlight light emitted from the backlight element 200 can be concentrated near the apex of the V-shaped structure 313 after being concentrated by the convex surface 314 (as indicated by a broken circle in the figure). Since in some embodiments of the present disclosure, the focus of the paraboloid 321 coincides with the apex of the V-like structure 313, that is, the backlight light can be concentrated near the focus of the paraboloid 321 under the convergence of the convex surface 314. The backlight light near the focus is emitted to the reflective member 320 under the reflection of the V-like structure 313.
  • the backlight light emitted near the focus of the paraboloid 321 can be emitted at a small emission angle after being reflected by the reflection member 320.
  • the backlight having a smaller emission angle can completely enter the corresponding quantum dot unit, thereby solving the problem of color purity degradation of the backlight and color crosstalk between the three primary color backlights.
  • the convex surface 314 is set to be a spherical surface, and the radius of curvature of the convex surface 314 satisfies the single spherical refraction law, and the relationship is as follows:
  • u is the distance from the surface of the backlight source 210 near the convex surface 314 to the apex of the convex surface 314, n is the refractive index of the convergence steering member 310, and v is the distance from the vertex of the convex surface 314 to the apex of the V-like structure 313. r is the radius of curvature of the convex surface 314.
  • the convergence effect of the convex surface 314 on the backlight light can be improved, so that the backlight light passing through the convex surface 314 is closest to the focus of the parabolic surface 321 to obtain a higher collimation backlight light.
  • FIG. 7 is a schematic structural diagram of another light emitting module according to some embodiments of the present disclosure. It can be seen from FIG. 7 that the difference from the above-mentioned light-emitting module shown in FIG. 4 is that the V-shaped structure 313 in the light-emitting module shown in FIG. 7 has two convex surfaces symmetrically disposed, and the surface of the V-like structure 313 does not need to be adhered. A reflective coating is attached, and the open line segments formed by any two points on the convex surface are inside, that is, outside the body. The remaining structure of the light-emitting module shown in FIG. 7 is similar to the light-emitting module shown in FIG. 4, and details are not described herein again.
  • the convex surface 314 Since the convex surface 314 has a converging effect on the backlight light, the backlight light passing through the convex surface 314 is concentrated near the apex of the V-like structure 313. In this case, if the emission angle of the backlight light is the same, the convex structure in the light-emitting module shown in FIG. 7 is easier to obtain a larger incident angle than the planar structure in the light-emitting module shown in FIG. 4, so that the illumination is in the V-like type. Most of the backlight light on the structure 313 is emitted in the form of reflections, so that it is not necessary to adhere the reflective coating on the surface of the V-like structure 313 to achieve reflection of backlight light.
  • parameters such as the distance, the refractive index of the convergence steering member 310, and the radius of curvature of the convex surface 314 can be set according to the above single spherical refractive law to maximize the convergence of the convex surface 314 to the backlight.
  • FIG. 8 is a schematic diagram of an optical path of a backlight according to some embodiments of the present disclosure.
  • the backlight light emitted from the backlight element 200 can be concentrated near the apex of the V-shaped structure 313 after being concentrated by the convex surface 314 (shown by a broken circle in the figure).
  • the backlight light can be concentrated near the focus of the paraboloid 321 under the convergence of the convex surface 314.
  • the backlight light near the focus is emitted to the reflective member 320 under the reflection of the V-like structure 313.
  • the backlight light emitted near the focus of the paraboloid 321 can be emitted at a small emission angle after being reflected by the reflection member 320.
  • the backlighting light passing through the light collimating structure 300 can achieve the desired collimation requirements, thereby avoiding the pixel color purity degradation and the color crosstalk between the three primary color backlights.
  • the backlight light incident on the V-like structure 313 should be emitted as much as possible in the form of emission. Therefore, in some embodiments of the present disclosure, the V can be adjusted.
  • the slope of the tangent of the pattern 313 changes the angle of incidence of the backlight light on the V-like structure 313 such that the angle of incidence satisfies the following relationship:
  • ⁇ is the incident angle of the backlight light on the V-like structure
  • n is the refractive index of the convergence steering member.
  • FIG. 9 is a schematic structural diagram of a liquid crystal display device according to an embodiment of the present disclosure.
  • the device includes a liquid crystal panel 500 and a backlight module 400 of any of the above.
  • the liquid crystal panel 500 includes a liquid crystal layer 510 and a quantum dot color conversion layer 520 disposed between the backlight module 400 and the quantum dot color conversion layer 520.
  • the liquid crystal layer 510 includes a plurality of liquid crystal cells 511 arranged in order.
  • the quantum dot color conversion layer 520 includes a plurality of quantum dot conversion groups 521 arranged in order, and the quantum dot conversion group 521 includes quantum dot units 5211 that can convert the backlight correspondingly into three primary colors, and the quantum dot cells 5211 are disposed corresponding to the liquid crystal cells 511.
  • the present disclosure provides a backlight module and a corresponding liquid crystal display device.
  • the backlight module is provided with a light collimating structure, and the light collimating structure comprises a converging steering component and a reflecting component disposed around the converging steering component.
  • the two opposite faces of the convergence steering member are respectively disposed as a convex structure and a reflective surface.
  • the reflective component includes a paraboloid for reflecting the backlight.
  • the backlight light emitted by the backlight element can be concentrated near the focus of the paraboloid by the convergence of the convex structure, and is emitted to the reflective member under the reflection of the reflective surface.
  • the backlight light emitted near the focus of the paraboloid can be emitted at a small emission angle after being reflected by the reflecting member.
  • a backlight with a smaller emission angle can completely enter the corresponding quantum dot unit, which can solve the problem of color purity degradation of the backlight and color crosstalk between the three primary color backlights.

Abstract

L'invention concerne un module de rétroéclairage comprenant : de multiples modules électroluminescents (100), chaque module électroluminescent (100) comprenant un élément de rétroéclairage (200) et une structure de collimation de rayons lumineux (300); l'élément de rétroéclairage (200) comprend au moins une source (210); la structure de collimation de rayons lumineux (300) comprend un composant de convergence et de rotation (310) et des composants de réflexion (320); le composant de convergence et de rotation (310) comprend un corps (311), ledit corps de composant (311) comprend une surface de réflexion (313), ladite surface de réflexion (313) étant utilisée pour réfléchir au moins une partie du rayon lumineux émis par la source de rétroéclairage (210) vers le plan dans lequel se trouve l'élément de rétroéclairage (200); les composants de réflexion (320) sont disposés à la périphérie du composant de convergence et de rotation (310), chaque composant de réflexion (320) comprend une surface incurvée (321), et ladite surface incurvée (321) est utilisée pour réfléchir le rayon lumineux réfléchi par la surface de réflexion (313).
PCT/CN2018/078158 2017-05-22 2018-03-06 Module de rétro-éclairage et dispositif d'affichage à cristaux liquides WO2018214611A1 (fr)

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CN201710361475.7 2017-05-22
CN201710361475.7A CN107329318B (zh) 2017-05-22 2017-05-22 一种背光模组及液晶显示装置

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