WO2016110064A1 - 棱镜膜片、曲面背光源和显示装置 - Google Patents

棱镜膜片、曲面背光源和显示装置 Download PDF

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Publication number
WO2016110064A1
WO2016110064A1 PCT/CN2015/082329 CN2015082329W WO2016110064A1 WO 2016110064 A1 WO2016110064 A1 WO 2016110064A1 CN 2015082329 W CN2015082329 W CN 2015082329W WO 2016110064 A1 WO2016110064 A1 WO 2016110064A1
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WIPO (PCT)
Prior art keywords
base angle
curved
prism
light
size
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PCT/CN2015/082329
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English (en)
French (fr)
Inventor
刁凯
朴仁镐
张亮
石海军
赵洪宇
Original Assignee
京东方科技集团股份有限公司
北京京东方显示技术有限公司
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Application filed by 京东方科技集团股份有限公司, 北京京东方显示技术有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US14/907,176 priority Critical patent/US20170235029A1/en
Publication of WO2016110064A1 publication Critical patent/WO2016110064A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G02B5/045—Prism arrays
    • 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
    • G02F1/133305—Flexible substrates, e.g. plastics, organic film
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02—Combinations of only two kinds of elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/02—Refractors for light sources of prismatic shape
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0231—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having microprismatic or micropyramidal shape
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • 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
    • 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
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Definitions

  • the present invention relates to the field of display, and in particular to a prism film, a curved backlight, and a display device.
  • a prism film is often provided on the light-emitting surface of the light guide plate or the diffusion plate.
  • the angles of the respective prism units on the existing prism film are the same.
  • the prism film When the prism film is applied to a curved backlight, it will cause the emitted light to converge toward the center of the display area, as shown in FIG. 1, so that the brightness angle of the emitted light becomes smaller, affecting the visual effect.
  • the application of curved backlights is becoming more and more widespread. Therefore, there is a need for a prismatic diaphragm that can be adapted to curved backlights.
  • each prism unit having a triangular cross section having a first bottom angle and a second bottom angle, the first bottom angle and the second bottom angle being located Said cross section close to the side of the substrate,
  • first base angle and the second base angle of the triangular cross section of at least one of the plurality of triangular prism units are different in size.
  • the plurality of triangular prism units are arranged along a first direction array, the first direction is perpendicular to an axial direction of each of the triangular prisms, and the first bottom angle of a triangular cross section in each of the triangular prism units All toward the first direction, and the second base angle of the triangular cross section in each of the triangular prism units is oriented in a second direction opposite to the first direction.
  • the ratio of the size of the first base angle and the size of the second base angle in each of the triangular prism units sequentially increases or decreases along the first direction.
  • the magnitude of the first base angle in each of the triangular prism units increases sequentially along the first direction and the magnitude of the second base angle decreases sequentially in the first direction.
  • the ratio of the size of the first base angle in each of the triangular prism units on the side of the prism unit centered on the prism film toward the first direction is equal to the magnitude of the second base angle, and/or The ratio of the size of the first base angle in each of the triangular prism units on the side of the prism unit centered on the prism film toward the second direction is equal to the magnitude of the second base angle.
  • the first base angle and the second base angle of the prism unit centered on the prismatic diaphragm are equal in magnitude.
  • the size of the first base angle and the size of the second base angle of the triangular prism unit are both in the range of 10 degrees to 80 degrees.
  • the substrate is formed integrally with the prism unit or separately.
  • Embodiments of the present invention also provide a curved backlight, including:
  • the curved backlight further includes:
  • a curved light guide plate having a light incident surface and a light exiting surface, wherein the prismatic film is disposed on the light emitting surface
  • the light emitted by the light source is incident on the curved light guide plate from a light incident surface located on a side surface of the light guide plate, and each of the prism units in the prism film is arranged along a direction in which the light is incident on the curved light guide plate.
  • the ratio of the size of the first base angle and the size of the second base angle in each of the triangular prism units is determined depending on the curvature of the curved light guide plate, or the size of the first base angle in each of the triangular prism units
  • the size of the second base angle is determined depending on the curvature of the curved light guide plate.
  • the curved backlight further includes:
  • a curved diffusing plate having a light incident surface and a light emitting surface, wherein the prism film is disposed on the light emitting surface;
  • each of the triangular prism units is in a direction perpendicular to a direction in which the light is incident on the curved diffusing plate Arrange,
  • the ratio of the size of the first base angle and the size of the second base angle in each of the triangular prism units is determined depending on the curvature of the curved diffusion plate, or the size of the first bottom angle in each of the triangular prism units
  • the size of the second base angle is determined depending on the curvature of the curved light guide plate.
  • An embodiment of the present invention further provides a display device comprising the prismatic film of any of the preceding embodiments or the curved backlight of any of the preceding embodiments.
  • At least one aspect of the above-described technical solutions of the present invention can compensate for the convergence effect of the emitted light caused by the bending of the light guide plate or the diffusion plate in the curved backlight by the asymmetric prism unit design.
  • the prism film, the curved backlight, and the display device according to the embodiment of the present invention the uniformity of the brightness of the emitted light can be improved, the viewing angle can be increased, and the visual effect can be improved.
  • FIG. 1 shows a schematic view of a prismatic diaphragm disposed in a curved backlight in the prior art
  • FIG. 2 is a schematic view showing a prismatic film in a horizontally placed state according to an embodiment of the present invention
  • FIG. 3 is a schematic view showing a prism film disposed in a curved backlight according to an embodiment of the present invention
  • Figure 4a is a schematic view showing the propagation path of the optical path in the prism film of the prior art
  • Figure 4b shows a schematic view of the propagation path of the optical path in a prismatic diaphragm in accordance with an embodiment of the present invention.
  • the prismatic film 200 includes a substrate 206 and a plurality of triangular prism elements 201 arranged in an array on the substrate 206, each triangular prism unit 201 having a triangular cross section having a first bottom angle ⁇ 1 and a second bottom
  • the angle ⁇ 2 (for example, may also have a vertex), the first base angle ⁇ 1 and the second base angle ⁇ 2 are both located on the side of the cross section close to the substrate 206.
  • the first base angle ⁇ 1 and the second base angle ⁇ 2 of the triangular cross section of at least one of the plurality of triangular prism units 201 are different in magnitude.
  • the prism film 100 of the prior art shown in FIG. 1 has the same cross-sectional symmetrical design (ie, two base angles and the like) in the prism film 100, and is assembled to In the curved backlight, the prism film 100 is bound to be bent accordingly, which results in the fact that the light incident direction is not the same for each prism unit 101, and since the same cross-section of each prism unit 101 is symmetrically designed, The actual light emission direction is also different. In the case where the prism film 100 shown in Fig. 1 is curved from the both sides to the middle, the light emission direction is concentrated toward the center of the display region.
  • the triangular prism unit 201 adopts a cross-sectional asymmetrical design, that is, two bottom angles in the cross section are not equal, which is compared with the prior art.
  • the prism unit 101 can make a certain deflection of the emitted light, thereby compensating for the influence of the curved backlight on the prism film.
  • Figures 4a and 4b respectively show the propagation path of light in a prior art prismatic film 100 and in a prismatic film 200 in accordance with an embodiment of the present invention (as indicated by the arrows in the figure).
  • the prismatic film 200 according to the embodiment of the present invention which is asymmetrically designed, can deflect the outgoing light by an angle ⁇ as compared with the prismatic film 100 of the prior art.
  • the deflection of the exiting light due to the bending of the light guide plate or the diffuser plate when the prism diaphragm is applied to the curved backlight is compensated.
  • the outgoing light can be emitted in a desired direction, for example, in a direction perpendicular to the display area.
  • the incident direction of the incident light is substantially perpendicular to the prismatic film 200 when placed horizontally in FIGS. 2 and 3, this is only illustrative, and the incident direction of the incident light is not limited thereto, for example, It is at an arbitrary inclination angle with the incident surface of the prism film 200.
  • each of the triangular prism units 201 may be asymmetrically designed, that is, each of the triangular prism units 201 has a first bottom angle ⁇ 1 of a unequal size in cross section. And a second base angle ⁇ 2; however, it is also possible that a part of the triangular prism unit 201 is designed to be asymmetric, for example, one, three, five, ten, etc., the triangular prism unit 201 is designed to be asymmetric.
  • the design of the light guide plate or the diffusion plate in the curved backlight can also be various.
  • the light guide plate or the diffusion plate can be integrally curved with a uniform curvature, with a uniform curvature local. Bent, or even curved with different curvatures on various parts.
  • the plurality of triangular prism units 201 may be arranged in an array along a first direction (eg, in a direction as indicated by the arrows in FIG. 2), the first direction being perpendicular to the axial direction of each of the triangular prisms, and each of the triangular prism units 301
  • the first base angle ⁇ 1 of the triangular cross section in the middle faces the first direction
  • the second base angle ⁇ 2 of the triangular cross section in each of the triangular prism units 301 faces a second direction opposite to the first direction.
  • first direction shown in FIG. 2 is the leftward direction, this is merely illustrative and is not a limitation of the first direction.
  • first direction may also be the direction in FIG. 2 .
  • the right direction is the first direction shown in FIG. 2 .
  • the magnitudes of the first base angle ⁇ 1 and the second base angle ⁇ 2 in each of the triangular prism units 201 may be determined according to the actual curvature of the light guide plate or the diffusion plate in the curved backlight and the design direction of the incident light.
  • the ratio of the magnitude of the first base angle ⁇ 1 and the magnitude of the second base angle ⁇ 2 in each of the triangular prism units 201 may be set to sequentially increase or decrease along the first direction.
  • the first base angle ⁇ 1 in each of the triangular prism units 201 may sequentially increase along the first direction and the magnitude of the second base angle ⁇ 2 sequentially decreases in the first direction. For example, as shown in FIGS.
  • the magnitude of the first base angle ⁇ 1 in each of the triangular prism units 201 is sequentially decreased from left to right, and the magnitude of the second base angle ⁇ 2 is sequentially increased from left to right, and thus, The ratio of the magnitude of the first base angle ⁇ 1 to the magnitude of the second base angle ⁇ 2 decreases sequentially from left to right or sequentially from right to left. This can better compensate for the direction of the outgoing light depending on the degree of tilt of the prism unit 201 at different locations in the curved backlight.
  • the size of the first base angle ⁇ 1 and the size of the second base angle ⁇ 2 in each of the triangular prism units 301 on the side of the prism unit centered on the prism film toward the first direction may also be
  • the ratios are set to be equal, and/or the magnitude of the first base angle ⁇ 1 and the size of the second base angle ⁇ 2 in each of the triangular prism units 301 on the side of the prism unit centered on the prism film toward the second direction
  • the ratios are set to be equal. This can improve the workability of the prism film.
  • some of the triangular prism elements 201 on the prismatic diaphragm 200 may have a symmetrical design, i.e., the first base angle ⁇ 1 and the second base angle ⁇ 2 are equal in magnitude.
  • the first base angle ⁇ 1 and the second base angle ⁇ 2 of the prism unit 201 centered on the prism film 200 are equal in size, as shown in the figure. 2 and 3 are shown. This ensures that when the prismatic diaphragm 200 is placed in a curved backlight, the centered prism unit 201 directs the outgoing light toward the center of the display area.
  • the magnitude of the first base angle ⁇ 1 and the magnitude of the second base angle ⁇ 2 may each be in the range of 10 degrees to 80 degrees, for example, in the range of 30 degrees to 60 degrees.
  • the magnitude of the first base angle ⁇ 1 and the magnitude of the second base angle ⁇ 2 are not limited thereto, and may take any value greater than 0 degrees and less than 90 degrees according to design requirements. If the curvature of the light guide plate or the diffusion plate in the curved backlight is large, the values of the first bottom angle ⁇ 1 and the second bottom angle ⁇ 2 in some of the triangular prism units 201 may also exceed 90 degrees, but are less than 180 degrees.
  • the substrate 206 may be integrally formed with the triangular prism unit 201, or may be formed separately from the triangular prism unit 201.
  • the substrate 206 and the triangular prism unit 201 may be formed separately and then bonded. The agents are bonded together. The arrangement of the substrate 206 allows the prism unit 201 to achieve more stable support.
  • An embodiment of the present invention also provides a curved backlight comprising the prismatic film 200 of any of the above embodiments.
  • the curved backlight may be a side incident type curved backlight
  • the curved backlight may include: a curved light guide plate having a light incident surface and a light emitting surface, wherein the prism film is disposed on the light emitting a light source, the light emitted by the light source is incident on the curved light guide plate from a light incident surface located at a side of the light guide plate, and each of the prism units in the prism film is arranged along a direction in which the light is incident on the curved light guide plate.
  • the ratio of the magnitude of the first base angle ⁇ 1 and the magnitude of the second base angle ⁇ 2 in each of the triangular prism units 301 is determined depending on the curvature of the curved light guide plate.
  • the curved backlight may also be a direct-type curved backlight.
  • the curved backlight may include a curved diffusing plate having a light incident surface and a light emitting surface, and the prismatic film is disposed on the curved surface.
  • the light emitted by the light source is incident on the curved diffusing plate from a light incident surface located at a bottom surface of the curved diffusing plate, and each of the prismatic prisms diffuses along the light incident surface
  • the direction of the plates is arranged in a direction perpendicular to the direction in which the ratio of the magnitude of the first base angle ⁇ 1 in each of the triangular prism units 301 to the magnitude of the second base angle ⁇ 2 is determined depending on the curvature of the curved diffusion plate.
  • the adaptability of the prismatic film 200 to the degree of bending of the curved backlight can be improved to better homogenize the brightness of the emitted light.
  • the size of the first base angle ⁇ 1 and the size of the second base angle ⁇ 2 may themselves be determined according to the curvature of the light guide plate or the diffusion plate in the curved backlight.
  • the prism film is located on the light exit surface of the light guide plate or the diffusion plate.
  • the prismatic film 200 may also be located on the light incident surface of the light guide plate or the diffusion plate.
  • An embodiment of the present invention further provides a display device comprising the prismatic film 200 of any of the above embodiments or the curved backlight of any of the above embodiments.
  • the uniformity of the brightness of the emitted light can be improved, the viewing angle can be increased, and the visual effect can be improved.

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
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Abstract

一种棱镜膜片(200)，包括：基底(206)及在基底(206)上成阵列排布的多个三棱镜单元(201)。每个三棱镜单元(201)具有三角形的横截面，横截面具有第一底角(α1)和第二底角(α2)，第一底角(α1)和第二底角(α2)均位于横截面靠近基底(206)的一侧。多个三棱镜单元(201)中的至少一个的三角形横截面的第一底角(α1)和第二底角(α2)大小不同。还公开了一种曲面背光源及显示装置。采用这种棱镜膜片(200)、曲面背光源和显示装置，可以改善出射光的亮度的均匀性，增加视角，提高视觉效果。

Description

棱镜膜片、曲面背光源和显示装置
本申请要求于2015年1月5日递交中国专利局的、申请号为201510002363.3的中国专利申请的权益，该申请的全部公开内容以引用方式并入本文。
技术领域
本发明涉及显示领域，尤其涉及一种棱镜膜片、一种曲面背光源和一种显示装置。
背景技术
在显示装置中，为了使从背光源出射的光均匀化，往往在导光板或扩散板的出光面上设置有棱镜膜片。现有的棱镜膜片上各个棱镜单元的各个角度均相同。当该棱镜膜片应用于曲面背光源时，其会使得出射光朝向显示区域的中心汇聚，如图1所示，于是出射光的亮度视角会变小，影响视觉效果。随着曲面型显示装置的发展，曲面背光源的应用也越来越广泛，因此，需要一种能够适应于曲面背光源的棱镜膜片。
发明内容
本发明的目的是提供一种棱镜膜片，其能够提高曲面背光源的亮度视角，增强显示效果。
本发明的目的还在于提供一种包含上述棱镜膜片的曲面背光源及显示装置。
为了实现上述发明目的，本发明的技术方案通过以下方式来实现：
本发明的实施例提供了一种棱镜膜片，包括：
基底，
在基底上成阵列排布的多个三棱镜单元，每个三棱镜单元具有三角形的横截面，所述横截面具有第一底角和第二底角，第一底角和第二底角均位于所述横截面靠近基底的一侧，
其中所述多个三棱镜单元中的至少一个的三角形横截面的第一底角和第二底角大小不同。
在一实施例中，所述多个三棱镜单元沿着第一方向阵列排布，所述第一方向垂直于各个三棱镜的轴向，且各个三棱镜单元中的三角形横截面的所述第一底角均朝向所述第一方向，且各个三棱镜单元中的三角形横截面的所述第二底角均朝向与所述第一方向相反的第二方向。
在一实施例中，各个三棱镜单元中的第一底角的大小和第二底角的大小的比值沿着第一方向依次增大或减小。
在一实施例中，各个三棱镜单元中的第一底角的大小沿着第一方向依次增大且第二底角的大小沿着第一方向依次减小。
在一实施例中，在棱镜膜片上居中的三棱镜单元的朝向第一方向的一侧上的各个三棱镜单元中的第一底角的大小与第二底角的大小的比值相等，和/或在棱镜膜片上居中的三棱镜单元的朝向第二方向的一侧上的各个三棱镜单元中的第一底角的大小与第二底角的大小的比值相等。
在一实施例中，在棱镜膜片上居中的三棱镜单元的第一底角和第二底角大小相等。
在一实施例中，所述三棱镜单元的第一底角的大小和第二底角的大小均在10度至80度的范围内。
在一实施例中，所述基底与三棱镜单元一体形成或分别独立形成。
本发明的实施例还提供一种曲面背光源，包括：
如上述任一实施例所述的棱镜膜片。
在一实施例中，所述曲面背光源还包括：
曲面导光板，所述曲面导光板具有入光面和出光面，所述棱镜膜片布置于所述出光面上；
光源，所述光源发出的光从位于导光板侧面的入光面射入曲面导光板，所述棱镜膜片中的各个三棱镜单元沿着所述光射入曲面导光板的方向排布，
其中，每个三棱镜单元中的第一底角的大小和第二底角的大小的比值依赖于所述曲面导光板的曲率而确定，或者，每个三棱镜单元中的第一底角的大小和第二底角的大小依赖于所述曲面导光板的曲率而确定。
在一实施例中，所述曲面背光源还包括：
曲面扩散板，所述曲面扩散板具有入光面和出光面，所述棱镜膜片布置于所述出光面上；
光源，所述光源发出的光从位于曲面扩散板底面的入光面射入曲面扩散板，所述棱镜膜片中的各个三棱镜单元沿着与所述光射入曲面扩散板的方向垂直的方向排布，
其中，每个三棱镜单元中的第一底角的大小和第二底角的大小的比值依赖于所述曲面扩散板的曲率而确定，或者，每个三棱镜单元中的第一底角的大小和第二底角的大小依赖于所述曲面导光板的曲率而确定。
本发明的实施例还提供了一种显示装置，包括如之前任一实施例所述的棱镜膜片或如之前任一实施例所述的曲面背光源。
本发明的上述技术方案中的至少一个方面能够通过非对称式的棱镜单元设计来补偿由曲面背光源中导光板或扩散板的弯曲导致的出射光的汇聚效应。采用根据本发明的实施例的棱镜膜片、曲面背光源和显示装置，可以改善出射光的亮度的均匀性，增加视角，提高视觉效果。
附图说明
图1示出现有技术中的设置在曲面背光源中的棱镜膜片的示意图；
图2示出根据本发明的一实施例的棱镜膜片处于水平放置状态的示意图；
图3示出根据本发明的一实施例的棱镜膜片设置在曲面背光源中时的示意图；
图4a示出光路在现有技术中的棱镜膜片中的传播路径的示意图；和
图4b示出光路在根据本发明的一实施例的棱镜膜片中的传播路径的示意图。
具体实施方式
下面通过实施例，并结合附图，对本发明的技术方案作进一步具体的说明。在说明书中，相同或相似的附图标号表示相同或相似的部件。下述参照附图对本发明实施方式的说明旨在对本发明的总体发明构思进行解释，而不应当理解为对本发明的一种限制。
图2和图3示意性地示出根据本发明的一实施例的棱镜膜片200。该棱镜膜片200包括：基底206以及在基底206上成阵列排布的多个三棱镜单元201，每个三棱镜单元201具有三角形的横截面，所述横截面具有第一底角α1和第二底角α2(例如还可具有顶角)，第一底角α1和第二底角α2均位于所述横截面靠近基底206的一侧。所述多个三棱镜单元201中的至少一个三棱镜单元201的三角形的横截面的第一底角α1和第二底角α2大小不同。
反观图1中示出的现有技术中的棱镜膜片100，该棱镜膜片100中的各个棱镜单元101均采用同样的横截面对称设计(即两个底角等大)，而在组装到曲面背光源中时棱镜膜片100必然会随之弯曲，这导致了对于各个棱镜单元101而言，实际上的光入射方向并不相同，由于各个棱镜单元101的同样的横截面对称设计，所以实际的光出射方向也会不同，在图1所示的棱镜膜片100的从两边向中间弯曲的情形中，光出射方向会向显示区域的中心方向汇聚。
如前所述，在根据本发明的实施例的棱镜膜片200中，三棱镜单元201采用了横截面非对称设计，即横截面中的两个底角不等，这相比于现有技术中的棱镜单元101，可以使得出射光产生一定的偏转，从而补偿曲面背光源对于棱镜膜片的影响。
作为示例，图4a和图4b分别示出了光线在现有技术中的棱镜膜片100中和在根据本发明的实施例的棱镜膜片200中的传播路径(如图中箭头所示)。参见图4a和图4b，根据折射原理可知，采用非对称设计的根据本发明的实施例的棱镜膜片200与现有技术中的棱镜膜片100相比可以使出射光偏转角度θ，这可以补偿当棱镜膜片应用于曲面背光源中时由于导光板或扩散板的弯曲导致的出射光的偏转。通过设置合适的第一底角α1和第二底角α2，可以使出射光以期望的方向出射，例如沿垂直于显示区域的方向出射。
需要说明的是，虽然图2和图3中示出入射光的入射方向是与水平放置时的棱镜膜片200大致垂直的，但是这只是示意性的，入射光的入射方向不限于此，例如可以与棱镜膜片200的入射表面成任意的倾斜角度。
另外，在根据本发明的实施例的棱镜膜片200中，可以是每个三棱镜单元201均为非对称式设计，即每个三棱镜单元201的横截面均具有大小不等的第一底角α1和第二底角α2；然而，也可以是其中一部分三棱镜单元201设计为非对称的，例如一个、三个、五个、十个等三棱镜单元201设计为非对称的。这是因为，在实际中，曲面背光源中的导光板或扩散板的设计也可以是多种多样的，例如，导光板或扩散板可以是整体以一致的曲率弯曲的，以一致的曲率局部弯曲的，或者甚至是在各个部分上以不同的曲率弯曲的。
在一示例中，多个三棱镜单元201可以沿着第一方向(例如沿如图2中箭头所示方向)阵列排布，所述第一方向垂直于各个三棱镜的轴向，且各个三棱镜单元301中的三角形横截面的第一底角α1均朝向所述第一方向，且各个三棱镜单元301中的三角形横截面的第二底角α2均朝向与所述第一方向相反的第二方向。
需要说明的是，虽然图2中示出的第一方向是向左的方向，但是这仅仅是示意性的，并非对第一方向的限定，例如，第一方向也可以是图2中的向右的方向。
作为示例，各个三棱镜单元201中的第一底角α1和第二底角α2的大小可以根据曲面背光源中的导光板或扩散板实际的曲率以及入射光的设计方向来确定。例如，各个三棱镜单元201中的第一底角α1的大小和第二底角α2的大小的比值可以设置成沿着第一方向依次增大或减小。作为示例，各个三棱镜单元201中的第一底角α1可以沿着第一方向依次增大而第二底角α2的大小沿着第一方向依次减小。例如，如图2和图3所示，各个三棱镜单元201中的第一底角α1的大小从左至右依次减小，而第二底角α2的大小从左至右依次增大，因而，第一底角α1的大小和第二底角α2的大小的比值从左至右依次减小或从右至左依次增大。这可以更好地根据曲面背光源中的不同位置上的三棱镜单元201的倾斜程度来对出射光方向进行补偿。在另一示例中，也可以将在棱镜膜片上居中的三棱镜单元的朝向第一方向的一侧上的各个三棱镜单元301中的第一底角α1的大小与第二底角α2的大小的比值设置成相等的，和/或将在棱镜膜片上居中的三棱镜单元的朝向第二方向的一侧上的各个三棱镜单元301中的第一底角α1的大小与第二底角α2的大小的比值设置成相等的。这可以提高棱镜膜片的可加工性。
作为示例，在棱镜膜片200上的一些三棱镜单元201可以具有对称设计，即第一底角α1和第二底角α2大小相等。这是因为尽管在曲面背光源中导光板或扩散板是弯曲的，但也不一定所有的三棱镜单元201出射的光的出射方向都会被改变。例如，在棱镜膜片200上居中的三棱镜单元201的第一底角α1和第二底角α2大小相等，如图 2和3所示。这可以保证当棱镜膜片200设置于曲面背光源中时，居中的三棱镜单元201将出射光引向显示区域的中心。
作为示例，第一底角α1的大小和第二底角α2的大小均可以在10度至80度的范围内，例如30度至60度的范围内。然而，第一底角α1的大小和第二底角α2的大小不限于此，其可以根据设计要求取大于0度小于90度之间的任意数值。如果曲面背光源中的导光板或扩散板的曲率很大，某些三棱镜单元201中的第一底角α1和第二底角α2的取值也可以超过90度，但小于180度。
作为示例，在本发明的实施例的棱镜膜片200中基片206可以与三棱镜单元201一体形成，也可以与三棱镜单元201独立形成，例如基片206和三棱镜单元201可以分别形成之后用粘接剂粘合在一起。该基片206的设置，可以使三棱镜单元201获得更稳定的支撑。
本发明的实施例还提供了一种曲面背光源，该曲面背光源包括如上述任一实施例所述的棱镜膜片200。作为示例，该曲面背光源可以是侧入射式曲面背光源，该曲面背光源可以包括：曲面导光板，所述曲面导光板具有入光面和出光面，所述棱镜膜片布置于所述出光面上；光源，所述光源发出的光从位于导光板侧面的入光面射入曲面导光板，所述棱镜膜片中的各个三棱镜单元沿着所述光射入曲面导光板的方向排布。每个三棱镜单元301中的第一底角α1的大小和第二底角α2的大小的比值(即不对称程度)依赖于所述曲面导光板的曲率而确定。
在另一示例中，该曲面背光源也可以是直下式曲面背光源，该曲面背光源可以包括：曲面扩散板，所述曲面扩散板具有入光面和出光面，所述棱镜膜片布置于所述出光面上；光源，所述光源发出的光从位于曲面扩散板底面的入光面射入曲面扩散板，所述棱镜膜片中的各个三棱镜单元沿着与所述光射入曲面扩散板的方向垂直的方向排布，其中，每个三棱镜单元301中的第一底角α1的大小和第二底角α2的大小的比值依赖于所述曲面扩散板的曲率而确定。
在上述示例中，棱镜膜片200对于曲面背光源的弯曲程度的适应性可以得到提高，以更好地将出射光的亮度均匀化。作为示例，第一底角α1的大小和第二底角α2的大小本身也可以根据曲面背光源中的导光板或扩散板的曲率确定。
在上述示例中，棱镜膜片位于所述导光板或扩散板的出光面。替代地，作为示例，棱镜膜片200也可以位于所述导光板或扩散板的入光面。
本发明的实施例还提供一种显示装置，其包括如上述任一实施例所述的棱镜膜片200或如上述任一实施例所述的曲面背光源。
借助于根据本发明的实施例的棱镜膜片、背光源及显示装置，可以改善出射光的亮度的均匀性，增加视角，提高视觉效果。
虽然结合附图对本发明进行了说明，但是附图中公开的实施例旨在对本发明优选实施方式进行示例性说明，而不能理解为对本发明的一种限制。
虽然本发明总体构思的一些实施例已被显示和说明，本领域普通技术人员将理解，在不背离本总体发明构思的原则和精神的情况下，可对这些实施例做出改变，本发明的范围以权利要求和它们的等同物限定。

Claims (12)

  1. 一种棱镜膜片，包括：
    基底，
    在所述基底上成阵列排布的多个三棱镜单元，每个三棱镜单元具有三角形的横截面，所述横截面具有第一底角和第二底角，第一底角和第二底角均位于所述横截面靠近基底的一侧，
    其中所述多个三棱镜单元中的至少一个的三角形横截面的第一底角和第二底角大小不同。
  2. 根据权利要求1所述的棱镜膜片，其中，所述多个三棱镜单元沿着第一方向阵列排布，所述第一方向垂直于各个三棱镜的轴向，且各个三棱镜单元中的三角形横截面的所述第一底角均朝向所述第一方向，且各个三棱镜单元中的三角形横截面的所述第二底角均朝向与所述第一方向相反的第二方向。
  3. 根据权利要求2所述的棱镜膜片，其中，各个三棱镜单元中的第一底角的大小和第二底角的大小的比值沿着第一方向依次增大或减小。
  4. 根据权利要求2所述的棱镜膜片，其中，各个三棱镜单元中的第一底角的大小沿着第一方向依次增大且第二底角的大小沿着第一方向依次减小。
  5. 根据权利要求2所述的棱镜膜片，其中，在棱镜膜片上居中的三棱镜单元的朝向第一方向的一侧上的各个三棱镜单元中的第一底角的大小与第二底角的大小的比值相等，和/或在棱镜膜片上居中的三棱镜单元的朝向第二方向的一侧上的各个三棱镜单元中的第一底角的大小与第二底角的大小的比值相等。
  6. 根据权利要求1-5中任一项所述的棱镜膜片，其中，在棱镜膜片上居中的三棱镜单元的第一底角和第二底角大小相等。
  7. 根据权利要求1-5中任一项所述的棱镜膜片，其中，所述三棱镜单元的第一底角的大小和第二底角的大小均在10度至80度的范围内。
  8. 根据权利要求1-5中任一项所述的棱镜膜片，其中，所述基底与三棱镜单元一体形成或分别独立形成。
  9. 一种曲面背光源，包括：
    根据权利要求1-8中任一项所述的棱镜膜片。
  10. 根据权利要求9所述的曲面背光源，还包括：
    曲面导光板，所述曲面导光板具有入光面和出光面，所述棱镜膜片布置于所述出光面上；
    光源，所述光源发出的光从位于曲面导光板侧面的入光面射入曲面导光板，所述棱镜膜片中的各个三棱镜单元沿着所述光射入曲面导光板的方向排布，
    其中，每个三棱镜单元中的第一底角的大小和第二底角的大小的比值依赖于所述曲面导光板的曲率而确定，或者，每个三棱镜单元中的第一底角的大小和第二底角的大小均依赖于所述曲面导光板的曲率而确定。
  11. 根据权利要求9所述的曲面背光源，还包括：
    曲面扩散板，所述曲面扩散板具有入光面和出光面，所述棱镜膜片布置于所述出光面上；
    光源，所述光源发出的光从位于曲面扩散板底面的入光面射入曲面扩散板，所述棱镜膜片中的各个三棱镜单元沿着与所述光射入曲面扩散板的方向垂直的方向排布，
    其中，每个三棱镜单元中的第一底角的大小和第二底角的大小的比值依赖于所述曲面扩散板的曲率而确定，或者，每个三棱镜单元中的第一底角的大小和第二底角的大小均依赖于所述曲面导光板的曲率而确定。
  12. 一种显示装置，包括根据权利要求1-8中任一项所述的棱镜膜片或根据权利要求9-11中任一项所述的曲面背光源。
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CN104748015B (zh) * 2015-04-09 2017-03-15 京东方科技集团股份有限公司 曲面显示装置的背光模组、扩散板以及曲面显示装置
CN105445829B (zh) * 2016-01-08 2018-05-25 京东方光科技有限公司 棱镜膜、导光板、背光模组及显示装置
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