WO2014172991A1 - 背光装置及液晶显示装置 - Google Patents

背光装置及液晶显示装置 Download PDF

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Publication number
WO2014172991A1
WO2014172991A1 PCT/CN2013/077957 CN2013077957W WO2014172991A1 WO 2014172991 A1 WO2014172991 A1 WO 2014172991A1 CN 2013077957 W CN2013077957 W CN 2013077957W WO 2014172991 A1 WO2014172991 A1 WO 2014172991A1
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WIPO (PCT)
Prior art keywords
light
guide plate
light guide
polarized light
polarized
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Ceased
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PCT/CN2013/077957
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English (en)
French (fr)
Inventor
王尚
杜志宏
周珊珊
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BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
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Publication of WO2014172991A1 publication Critical patent/WO2014172991A1/zh
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Classifications

    • 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
    • G02F1/13362—Illuminating devices providing polarized light, e.g. by converting a polarisation component into another one
    • 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
    • G02B6/0056—Means for improving the coupling-out of light from the light guide for producing polarisation effects, e.g. by a surface with polarizing properties or by an additional polarizing 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
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

Definitions

  • the present disclosure relates to a backlight device and a liquid crystal display device. Background technique
  • the display device controls the intensity of light entering the liquid crystal display by controlling the direction in which the liquid crystal is arranged, thereby realizing the display of the image.
  • a device that provides incident light to the liquid crystal display is a backlight.
  • Backlight devices typically include a white light source. After the white light is filtered into polarized light by the polarizing plate, the liquid crystal display device can control whether the polarized light can pass through the liquid crystal display by controlling the arrangement direction of the liquid crystal.
  • the polarizing plate filters the white light into polarized light, a large portion of the light is filtered by the polarizing plate, thereby causing the light utilization efficiency of the backlight device to be low, which affects the display effect of the liquid crystal display device.
  • Embodiments of the present disclosure provide a backlight device and a liquid crystal display device, which can improve the light utilization efficiency of the backlight device and effectively improve the display effect of the liquid crystal display device.
  • an embodiment of the present disclosure provides a backlight device including a first light guide plate and a second light guide plate disposed adjacent to each other on a same plane; a light source disposed on one side of the first light guide plate and the second light guide plate a collimating optical member disposed on the side of the first light guide plate and the second light guide plate and adjacent to the light source; a polarized light splitting device disposed on the side of the first light guide plate; and disposed on the first The two lights, the parallel light is incident on the polarization beam splitting device, and the polarization beam splitting device is divided into a first polarized light and a second polarized light, and a polarization direction of the first polarized light and the second polarized light The polarization directions are perpendicular to each other.
  • the first polarized light is reflected by the polarized light splitting device and then incident on the first light guide plate, and the second polarized light is transmitted from the polarized light splitting device, and then incident on the reflective device.
  • the reflective device reflects and is incident on the second light guide plate.
  • the polarizing beam splitting device is at least one polarizing beam splitter, and the reflecting device is at least one mirror.
  • the at least one polarizing beam splitter is at an angle of 35 degrees to 55 degrees with the first light guide plate, and the at least one mirror is at an angle of 35 degrees to 55 degrees with the second light guide plate.
  • the at least one polarizing beam splitter is at an angle of 45 degrees with the first light guide plate, and the at least one mirror is at an angle of 45 degrees with the second light guide plate.
  • the at least one polarizing beam splitter is at least three polarizing beamsplitters, and the at least one mirror is at least three mirrors.
  • the at least three polarizing beamsplitters are disposed at equal intervals along the side of the first light guiding plate such that the polarizing beamsplitters are projected perpendicular to a plane perpendicular to the parallel light. Do not overlap.
  • a first light blocking sheet is disposed between the adjacent polarizing beamsplitters for separating the second polarized light transmitted from the polarizing beam splitter and not yet incident to the adjacent polarized light. Parallel light from the beam splitter.
  • the at least three mirrors are disposed at equal intervals along one side of the second light guide plate, and positions of the at least three mirrors correspond to positions of the at least three polarizing beamsplitters. So that the second polarized light transmitted from each of the polarizing beamsplitters is incident on the corresponding mirror.
  • a second light blocking sheet is disposed between the adjacent mirrors for avoiding leakage of the second polarized light transmitted from the polarizing beam splitter.
  • a third light blocking sheet is disposed between the first light guide plate and the second light guide plate.
  • embodiments of the present disclosure also provide a liquid crystal display device including a liquid crystal display panel and the above-described backlight device.
  • the liquid crystal display panel is divided into a first display portion and a second display portion, wherein a position of the first display portion corresponds to a position of a first light guide plate of the backlight device, and a position and a position of the second display portion
  • the first display portion can control the arrangement of the liquid crystal molecules in the first display portion to allow the first polarized light to pass
  • the second display portion can The arrangement of the liquid crystal molecules in the second display portion is controlled to allow the second polarized light to pass.
  • the backlight device and the liquid crystal display device provided by the embodiments of the present disclosure can divide the light emitted by the light source into the first polarized light and the second polarized light whose polarization directions are perpendicular to each other by the polarizing beam splitting device, and further A polarized light and a second polarized light are respectively introduced into the first light guide plate and the second light guide plate.
  • the first light guide plate and the second light guide plate can respectively utilize different polarization states of the light emitted by the light source, so that the light guide plate including the first light guide plate and the second light guide plate can maximize the utilization of light emitted by the light source.
  • the light utilization efficiency of the backlight device is greatly improved.
  • FIG. 1 is a schematic plan view of a backlight device according to an embodiment of the present disclosure
  • FIG. 2 is a schematic plan view of another backlight device according to an embodiment of the present disclosure
  • FIG. 3b is a schematic view showing the distribution of a polarizing beam splitter of another backlight device according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic diagram showing the distribution of a polarizing beam splitter of another backlight device according to an embodiment of the present disclosure. detailed description
  • an embodiment of the present disclosure provides a backlight device 1 including a light source 2; collimated light a member 3 for converting light emitted from the light source 2 into parallel light; a first light guide plate 4 and a second light guide plate 5, a polarization beam splitting device 6 disposed on one side of the first light guide plate 4, and a The light reflecting device 7 on one side of the two light guide plates 5.
  • the light emitted from the light source 2 passes through the collimating optics 3 to become parallel light L, and the parallel light L is incident on the polarization beam splitting device 6, and is divided into a first polarized light L1 and a second polarized light L2 by the polarizing beam splitting device 6, the first polarized light
  • the polarization direction of L1 and the polarization direction of the second polarization L2 are perpendicular to each other.
  • the first polarized light L1 is reflected by the polarization beam splitting device 6 and then incident on the first light guide plate 4.
  • the second polarized light L2 is transmitted from the polarizing beam splitting device 6, and then enters the light reflecting device 7, is reflected by the reflecting device 7, and is incident on the first light beam L1.
  • the polarizing beam splitting device 6 and the light reflecting device 7 may be located on the same side of the entire light guiding plate composed of the first light guiding plate and the second light guiding plate, that is, if the first light guiding plate and the second light guiding plate are adjacent to each other and flat When laid on the same plane, the polarization beam splitting device 6 is located on the left side of the first light guide plate, and the light reflecting device 7 is also located on the left side of the second light guide plate.
  • the position of the first light guide plate and the second light guide plate may be various. The purpose of illustrating the relative positional relationship between the first light guide plate 4 and the polarization beam splitting device 6 and the second light guide plate 5 and the light reflecting device 7 is illustrated. .
  • the backlight device 1 provided by the embodiment of the present disclosure can divide the white light emitted by the light source 2 into the first polarized light L1 and the second polarized light L2 whose polarization directions are perpendicular to each other by the polarizing beam splitting device 6, and further the first polarized light L1 and The second polarized light L2 is introduced into the first light guide plate 4 and the second light guide plate 5, respectively.
  • the first light guide plate 4 and the second light guide plate 5 can respectively use nearly 50% of the light emitted by the light source 2, that is, the entire light guide plate including the first light guide plate 4 and the second light guide plate 5 can be nearly 100.
  • % of the light is used to provide illumination for the liquid crystal display device or the like, so that the light utilization of the light source is maximized, thereby greatly improving the light utilization efficiency of the backlight device.
  • the light source 2 mainly refers to a common point light source commonly used in the field of liquid crystal display, and the emitted light is unpolarized light, such as a white light emitting diode (LED). Since the light emitted from the point light source is radial, in order to make the light emitted from the light source 2 concentrated and make full use, the collimating optics 3 provided between the light source 2 and the polarizing beam splitting device 6 can radiate the light source 2 The light is converted into parallel light L to ensure that the light has good directivity before entering the light guide plate, and the light loss is reduced.
  • LED white light emitting diode
  • the collimating optics 3 can also be omitted.
  • the collimating optics described in the embodiments of the present disclosure may be a collimating lens, or any other optical element that can convert the diverging light into parallel light, which is not limited by the disclosure.
  • the polarization beam splitting device 6 may be any device capable of dividing white light into polarized light whose polarization directions are perpendicular to each other, which is not limited in the present disclosure. For example, as shown in FIG.
  • the polarization beam splitting device 6 is at least one polarization beam splitter 61, and the main functional part of the polarization beam splitter 61 is a brightness enhancement film (DBEF) produced by 3M Company. , Dual Brightness Enhancement Film ).
  • DBEF brightness enhancement film
  • the polarizing beam splitter 61 Since the polarizing beam splitter 61 is disposed on one side of the first light guiding plate 4, and it is necessary to separate the incident parallel light L into the first polarized light L1 and the second polarized light L2 whose polarization directions are perpendicular to each other, and at the same time ensure the first The polarized light L1 can be incident on the first light guide plate 4 so that the second polarized light L2 does not enter the second light guide plate 5. Therefore, the polarizing beam splitter 61 needs to form an appropriate angle with the first light guide plate 4.
  • the polarizing beam splitter 61 and the first light guide plate 4 may form an angle of 35 degrees to 55 degrees. Preferably, the angle is 45 degrees to ensure that both the first polarized light L1 and the second polarized light L2 can Shoot in the intended direction.
  • the number of the polarization beam splitters 61 can be designed according to the processing level and the performance parameter requirements of the backlight device 1, usually ranging from several to several tens of.
  • the polarizing beam splitter 61 needs to have a size large enough to cover all of the collimated light L emitted from the collimating optics 3.
  • the space left by the polarizing beam splitter 61 is also large, so that even if the size of the polarizing beam splitter 61 is large, it can form a relatively large angle with the first light guiding plate 4. To meet the above requirements.
  • a certain space is reserved for the polarization beam splitter 61, for example, the space is defined as a tube T surrounded by a light-impermeable wall.
  • the angle between the polarizing beam splitter 61a and the first light guiding plate 4 is at most a; see FIG. 3b, when three polarized lights are disposed in the space
  • the angle between each of the polarization beam splitters 61b and the first light guide plate 4 is ⁇ .
  • the largest ⁇ is smaller than the maximum ⁇ , so the structure shown in Fig. 3b is more advantageous for transmitting and reflecting all the parallel lights L, respectively.
  • each polarizing beam splitter 61b and its angle with the first light guide plate 4 are equal, but the undisclosed embodiment is not limited thereto.
  • each The size of the polarization beam splitter 61 and the angle with the first light guide plate 4 may be different, as long as each of the polarization beam splitters 61 can cooperate to divide all the parallel light L into the first polarized light L1 and the second polarized light. L2 can be.
  • a plurality of polarization beam splitters 61 are usually disposed, for example, At least three polarization beam splitters 61 are provided so that each of the polarization beam splitters 61 and the first light guide plate 4 have an appropriate angle.
  • the at least three polarizing beamsplitters 61 may be disposed at equal intervals or at unequal intervals along one side of the first light guide plate 4 such that the polarizing beam splitters 61 are perpendicular to the plane of the parallel light L.
  • the projections do not overlap each other, and thus, each of the polarization beam splitters 61 completely transmits and reflects the parallel light L transmitted through the collimator optics 3.
  • a first light blocking sheet 81 may be disposed between the adjacent polarizing beam splitters 61, and the first light blocking sheet 81 may be a sheet-like structure formed of a material that is opaque. It is used to separate the second polarized light L2 transmitted from the polarizing beam splitter 61 and the parallel light L that has not been incident on the adjacent polarizing beam splitter 61, thereby making the composition of the second polarized light L2 more pure.
  • the polarizing beam splitter 61 divides the parallel light L into the first polarized light L1 and the second polarized light L2
  • the first polarized light L1 is reflected by the polarizing beam splitter 61, thereby being incident on the first light guiding plate 4
  • the dichroic light L2 is transmitted by the polarization beam splitter 61 to be incident on the light reflecting means 7.
  • the retroreflective device 7 may specifically be various devices capable of reflecting light, such as a mirror, a plane mirror, and the like. Since the light reflecting means 7 needs to totally reflect the second polarized light L2 transmitted through the polarizing beam splitting means 6 to the second light guiding plate 5, the reflecting means 7 and the polarized light splitting are seen from the continuity of the propagation of the second polarized light L2. The position of the device 6 should be corresponding.
  • the polarization beam splitting means 6 is at least one polarization beam splitter 61
  • the light reflecting means 7 may be at least one mirror 71.
  • the polarization beam splitting device 6 is at least three polarizing beamsplitters 61, and then the reflecting device 7 is also at least three mirrors 71.
  • These mirrors 71 may be disposed at equal intervals along one side of the second light guide plate 5, and the positions of the respective mirrors 71 correspond to the positions of the polarization beam splitters 61, respectively, so as to be transmitted from each of the polarization beam splitters 61.
  • the second polarized light L2 is incident on the corresponding mirror.
  • the mirror 71 and the second light guide plate 5 may form an angle of 35 degrees to 55 degrees. Preferably, the angle is 45 degrees, so that the second polarized light L2 can be incident on the second light guide plate at a suitable angle. 5.
  • the number of the polarization beam splitters 61 and the number of the mirrors 71 may not be equal, as long as the second polarized light L2 emitted from the polarization beam splitter 61 can be completely completed.
  • the embodiment of the present disclosure does not limit the reflection of the mirror 71 to the second light guide plate 5.
  • a second light blocking sheet (not shown) may be disposed between the adjacent mirrors 71.
  • the second polarized light L2 can be totally reflected into the second light guide plate 5, improving the light utilization efficiency.
  • the second polarized light L2 is reflected by the mirror 71, and is incident on the second light guide plate 5, and serves as a light source for a liquid crystal display device or the like together with the first polarized light L1 incident on the first light guide plate 4.
  • the first polarized light L1 and the second polarized light L2 in which the light emitted from the backlight device 1 is divided into mutually perpendicular polarization directions, can be effectively utilized, thereby greatly improving the light utilization efficiency of the backlight device 1.
  • the relative positions of the first light guide plate 4 and the second light guide plate 5 may be multiple, as long as the first light guide plate 4 and the second light guide plate 5 do not overlap each other in the light output direction, the first polarized light L1
  • the second polarized light L2 is not confused after being emitted from the first light guide plate 4 and the second light guide plate 5, respectively, and the embodiment of the present disclosure does not limit this.
  • the first light guide plate 4 and the second light guide plate 5 are located in the same plane and are in contact with each other.
  • a third light blocking sheet (not shown) may be disposed between the first light guide plate 4 and the second light guide plate 5, that is, the first light guide plate 4 and the second light guide plate 5 are laid on the same plane, and The third light blocking sheets are connected to each other to further ensure that the first polarized light L1 in the first light guiding plate 4 and the second polarized light L2 in the second light guiding plate 5 do not interfere with each other.
  • the light emitted by the light source is converted into parallel light by the collimating optics to be incident on the side of the first light guide plate;
  • the parallel light is divided into first polarized light and second polarized light by a polarization beam splitting device, wherein a polarization direction of the first polarized light and a polarization direction of the second polarized light are perpendicular to each other, the first The polarized light is reflected by the polarized light splitting means and then incident on the first light guide plate, and the second polarized light is transmitted from the polarized light splitting means, and then incident on the reflective means provided on the side of the second light guide plate;
  • the polarization beam splitting device may be any device capable of dividing the white light into polarized light whose polarization directions are perpendicular to each other, which is not limited in the disclosure.
  • the polarizing beam splitting device includes at least one polarizing beam splitter, and the main functional portion of the polarizing beam splitter is DBEF manufactured by 3M Company.
  • the parallel light may be split into first polarized light and second polarized light by at least one polarizing beam splitter.
  • Polarizing beam splitter The specific number and setting position can be adjusted according to the structural design of the backlight device. The foregoing has been described in detail, and will not be described herein.
  • the light reflecting device may specifically be various devices capable of reflecting light, such as a mirror, a plane mirror, and the like. Since the light reflecting device also needs to reflect all of the second polarized light transmitted through the polarizing beam splitting device to the second light guiding plate, the position of the reflecting device and the polarizing beam splitting device should be from the continuity of the second polarized light propagation. Corresponding.
  • the polarizing beam splitting means is at least one polarizing beam splitter, the reflecting means may be at least one mirror.
  • the second polarized light may be reflected by the at least one mirror and then incident on the second light guide plate.
  • the number of polarizing beamsplitters and the number of mirrors may not be equal, as long as the second polarized light emitted from the polarizing beam splitter can be completely reflected by the mirror to the first
  • the two light guide plates are not limited, and the embodiments of the present disclosure do not limit this.
  • an embodiment of the present disclosure further provides a liquid crystal display device, including a liquid crystal display panel, and the backlight device provided by any of the foregoing embodiments.
  • the liquid crystal display panel is divided into a first display portion and a second display portion.
  • the position of the first display portion corresponds to the position of the first light guide plate of the backlight device, and the position of the second display portion and the position of the second light guide plate of the backlight device
  • the first display portion can control the arrangement of the liquid crystal molecules in the first display portion to allow the first polarized light to pass the display
  • the second display portion can control the arrangement of the liquid crystal molecules in the second display portion to allow the second polarization
  • the light is realized by display, and the polarization directions of the first polarized light and the second polarized light are perpendicular to each other.
  • the liquid crystal display panel is divided into a first display portion and a second display portion, and the first display portion can control the arrangement of liquid crystal molecules in the first display portion.
  • the second display portion is capable of controlling an arrangement of liquid crystal molecules in the second display portion to allow the second polarized light to pass.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)

Abstract

一种背光装置（1）及液晶显示装置。该背光装置（1）包括相邻设置在同一平面上的第一导光板（4）和第二导光板（5）；设置在该第一导光板（4）和第二导光板（5）的一侧的光源（2）；设置于该第一导光板（4）和第二导光板（5）的该侧且在该光源（2）之前的准直光学件（3）；设置于所述第一导光板（4）的该侧的偏振光分光装置（6）；以及设置于所述第二导光板（5）的该侧的反光装置（7）。所述光源（2）发出的光通过所述准直光学件（3）成为平行光（L），所述平行光（L）入射至所述偏振光分光装置（6），被所述偏振光分光装置（6）分成第一偏振光（L1）和第二偏振光（L2），所述第一偏振光（L1）的偏振方向与第二偏振光（L2）的偏振方向相互垂直。所述第一偏振光（L1）被所述偏振光分光装置（6）反射后入射至所述第一导光板（4），所述第二偏振光（L2）从所述偏振光分光装置（6）透射后，入射至所述反光装置（7），被所述反光装置（7）反射后入射至所述第二导光板（5）。

Description

背光装置及液晶显示装置 技术领域
本公开涉及一种背光装置及液晶显示装置。 背景技术
在液晶显示技术中，显示装置是通过控制液晶排列方向来控制进入液晶 显示屏的光的强度， 从而实现图像的显示的。 为液晶显示屏提供入射光的装 置即为背光装置。 背光装置通常包括白光光源。 通过偏振片将该白光过滤成 偏振光以后，液晶显示装置即可通过控制液晶的排列方向来控制偏振光是否 可以通过液晶显示屏。
然而，在偏振片将白光过滤成偏振光的同时，有 4艮大一部分光都被偏振 片过滤掉了， 从而造成背光装置的光利用率偏低， 影响液晶显示装置的显示 效果。 发明内容
本公开实施例提供了一种背光装置及液晶显示装置，能够提高背光装置 的光利用率， 有效提高液晶显示装置的显示效果。
为达到上述目的， 本公开采用如下技术方案。
一方面，本公开的实施例提供一种背光装置， 包括相邻设置在同一平面 上的第一导光板和第二导光板；设置于该第一导光板和第二导光板的一侧的 光源；设置于该第一导光板和第二导光板的该侧且在该光源之前的准直光学 件； 设置于所述第一导光板的该侧的偏振光分光装置； 以及设置于所述第二 光， 所述平行光入射至所述偏振光分光装置， 被所述偏振光分光装置分成第 一偏振光和第二偏振光，所述第一偏振光的偏振方向与所述第二偏振光的偏 振方向相互垂直。， 所述第一偏振光被所述偏振光分光装置反射后入射至所 述第一导光板， 所述第二偏振光从所述偏振光分光装置透射后， 入射至所述 反光装置， 被所述反光装置反射后入射至所述第二导光板。
可选的，所述偏振光分光装置为至少一个偏振光分光镜，所述反光装置 为至少一个反光镜。 可选的， 所述至少一个偏振光分光镜与所述第一导光板成 35 度至 55 度夹角， 所述至少一个反光镜与所述第二导光板成 35度至 55度夹角。
优选的， 所述至少一个偏振光分光镜与所述第一导光板成 45度夹角， 所述至少一个反光镜与所述第二导光板成 45度夹角。
可选的，所述至少一个偏振光分光镜为至少 3个偏振光分光镜，所述至 少一个反光镜为至少 3个反光镜。
较佳的，所述至少 3个偏振光分光镜等间隔地沿所述第一导光板的该侧 错落设置，以使各所述偏振光分光镜在垂直于所述平行光的平面的投影互不 重叠。
优选的， 其中， 相邻的所述偏振光分光镜之间设置有第一隔光片， 用于 分隔从所述偏振光分光镜中透射的第二偏振光和尚未入射至相邻的偏振光 分光镜的平行光。
较佳的，所述至少 3个反光镜等间隔地沿所述第二导光板的一侧错落设 置，所述至少 3个反光镜的位置与所述至少 3个偏振光分光镜的位置相对应， 以使从每个所述偏振光分光镜透射的第二偏振光入射到对应的反光镜。
优选的， 其中， 相邻的所述反光镜之间设置有第二隔光片， 用于避免从 所述偏振光分光镜中透射的第二偏振光的泄漏。
优选的， 所述第一导光板和所述第二导光板之间设置有第三隔光片。 另一方面，本公开的实施例还提供一种液晶显示装置， 包括液晶显示面 板和上述的背光装置。 所述液晶显示面板分为第一显示部和第二显示部， 所 述第一显示部的位置与所述背光装置的第一导光板的位置相对应，所述第二 显示部的位置与所述背光装置的第二导光板的位置相对应，所述第一显示部 能够控制所述第一显示部中的液晶分子的排列以允许所述第一偏振光通过， 所述第二显示部能够控制所述第二显示部中的液晶分子的排列以允许所述 第二偏振光通过。
采用上述技术方案后，本公开实施例提供的背光装置及液晶显示装置能 够通过偏振光分光装置将光源发出的光分为偏振方向相互垂直的第一偏振 光和第二偏振光，并进一步将第一偏振光和第二偏振光分别导入第一导光板 和第二导光板。 这样， 第一导光板和第二导光板可以将光源发出的光的不同 偏振态进行分别利用，实现包括第一导光板和第二导光板的导光板整体对光 源发出的光利用的最大化， 从而大大提高了背光装置的光利用率。 附图说明
为了更清楚地说明本公开或现有技术中的技术方案，下面将对本公开提 供的技术方案或现有技术描述中所需要使用的附图作筒单地介绍，显而易见 地，下面描述中的附图仅仅是本公开的技术方案的部分具体实施方式图示说 明， 对于本领域普通技术人员来讲， 在不付出创造性劳动的前提下， 还可以 根据这些附图获得其他的附图。
图 1为本公开实施例提供的一种背光装置的结构平面示意图； 图 2为本公开实施例提供的另一种背光装置的结构平面示意图； 图 3a为本公开实施例提供的一种背光装置的偏振光分光镜的分布示意 图；
图 3b为本公开实施例提供的另一种背光装置的偏振光分光镜的分布示 意图； 和
图 4 为本公开实施例提供的另一种背光装置的偏振光分光镜的分布示 意图。 具体实施方式
下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行 清楚、 完整地描述， 显然， 所描述的实施例仅仅是本公开一部分实施例， 而 不是全部的实施例。基于本公开中的实施例， 本领域普通技术人员在没有作 出创造性劳动前提下所获得的所有其他实施例， 都属于本公开保护的范围。
除非另作定义，此处使用的技术术语或者科学术语应当为本公开所属领 域内具有一般技能的人士所理解的通常意义。本公开专利申请说明书以及权 利要求书中使用的 "第一"、 "第二" 以及类似的词语并不表示任何顺序、 数 量或者重要性， 而只是用来区分不同的组成部分。 同样， "一个" 或者 "一" 等类似词语也不表示数量限制， 而是表示存在至少一个。 "连接" 或者 "相 连"等类似的词语并非限定于物理的或者机械的连接， 而是可以包括电性的 连接， 不管是直接的还是间接的。 "上"、 "下"、 "左"、 "右" 等仅用于表示 相对位置关系， 当被描述对象的绝对位置改变后， 则该相对位置关系也相应 地改变。
如图 1所示， 本公开的实施例提供一种背光装置 1包括光源 2; 准直光 学件 3, 用于将光源 2发出的光转换成平行光射出； 第一导光板 4和第二导 光板 5, 设置在第一导光板 4的一侧的偏振光分光装置 6以及设置在第二导 光板 5的一侧的反光装置 7。
光源 2发出的光通过准直光学件 3成为平行光 L,平行光 L入射至偏振 光分光装置 6, 被偏振光分光装置 6分成第一偏振光 L1和第二偏振光 L2, 第一偏振光 L1的偏振方向与第二偏振光 L2的偏振方向相互垂直。第一偏振 光 L1被偏振光分光装置 6反射后入射至第一导光板 4,第二偏振光 L2从偏 振光分光装置 6透射后， 入射至反光装置 7, 被反光装置 7反射后入射至第 二导光板 5。
所述偏振光分光装置 6与反光装置 7可以位于由第一导光板和第二导光 板构成的导光板整体的同一侧，即如果第一导光板和第二导光板相邻设置的 平板且平铺在同一平面， 则偏振光分光装置 6位于第一导光板的左侧， 反光 装置 7也位于第二导光板的左侧。第一导光板和第二导光板的设置位置可以 有多种，此处只是为了说明第一导光板 4和偏振光分光装置 6以及第二导光 板 5和反光装置 7的相对位置关系进行举例说明。
本公开实施例提供的背光装置 1 能够通过偏振光分光装置 6将光源 2 发出的白光分为偏振方向相互垂直的第一偏振光 L1和第二偏振光 L2,并进 一步将第一偏振光 L1和第二偏振光 L2分别导入第一导光板 4和第二导光板 5。 这样， 第一导光板 4和第二导光板 5分别可以利用光源 2发出的光的将 近 50%,也就是说包括第一导光板 4和第二导光板 5的导光板整体就能够将 将近 100%的光都用于为液晶显示装置等提供照明， 使得光源的光利用最大 化， 从而大大提高了背光装置的光利用率。
可选的，在背光装置 1中， 光源 2主要是指液晶显示领域常用的普通点 光源， 其发出的光是非偏振光， 如白光发光二极管（LED )等。 由于点光源 发出的光为放射状， 为了能将光源 2发出的光集中到一起进行充分利用， 在 光源 2与偏振光分光装置 6之间设置的准直光学件 3能够将光源 2发出的放 射状的光转化成平行光 L射出，从而保证了光在进入导光板前都具有良好的 方向性， 减少了光的损耗。 当然， 在本公开的其他实施例中， 如果光源 2本 身发出的光就是平行光， 那么准直光学件 3也可以省去。 本公开实施例所述 的准直光学件可以为准直透镜，或者其他任何可以起到将发散的光线转化为 平行光的光学元件， 本公开不做限定。 具体的，偏振光分光装置 6可以是任何能够将白光分成偏振方向相互垂 直的偏振光的装置， 本公开对此不作限定。 例如， 如图 2所示， 在本公开的 一个实施例中， 偏光分光装置 6为至少一个偏振光分光镜 61 , 该偏振光分 光镜 61的主要功能部分为 3M公司生产的增亮膜（DBEF, Dual Brightness Enhancement Film )。
由于偏振光分光镜 61设置在第一导光板 4的一侧， 并且需要将入射的 平行光 L分成偏振方向相互垂直的第一偏振光 L1和第二偏振光 L2分别射 出， 且同时保证使第一偏振光 L1能够入射至第一导光板 4而使第二偏振光 L2不射入第二导光板 5, 因此， 偏振光分光镜 61需要与第一导光板 4成一 个合适的角度。 可选的， 偏振光分光镜 61与第一导光板 4可以成 35度至 55度夹角， 优选的， 该夹角为 45度， 以保证第一偏振光 L1和第二偏振光 L2都能够按照预定方向射出。
偏振光分光镜 61的个数可以根据加工工艺水平和背光装置 1的性能参 数要求而设计， 通常为几个至几十个不等。 为了使从准直光学件 3中射出的 平行光 L都能被偏振光分光镜 61分解，偏振光分光镜 61需要具有足够大的 尺寸以覆盖所有从准直光学件 3射出的平行光 L。 当背光装置 1的尺寸较大 时， 留给偏振光分光镜 61的空间也较大， 这样即使偏振光分光镜 61的尺寸 较大， 也能够与第一导光板 4成一个比较大的角度， 以满足上述角度要求。
相反， 当背光装置 1的尺寸较小时， 留给偏振光分光镜 61的空间也较 小， 这样， 当偏振光分光镜 61的尺寸较大时， 就只能与第一导光板 4成一 个较小的角度， 进而无法满足上述角度要求， 不利于将全部平行光 L分别进 行透射和反射。 这个问题可以通过增加偏振光分光镜 61的数量同时减小每 个偏振光分光镜 61的尺寸来解决。 如图 3a和 3b所示， 在背光装置 1的设 计中， 为偏振光分光镜 61预留了一定的空间， 例如该空间被限定为由不透 光壁围成的管 T。 参见图 3a, 则当在 T内设置一个偏振光分光镜 61a时， 偏 振光分光镜 61a与第一导光板 4的夹角最大为 a ; 参见图 3b, 当在该空间内 设置 3个偏振光分光镜 61b时，每个偏振光分光镜 61b与第一导光板 4的夹 角为 β。 显然， 最大的 α小于最大的 β , 因此图 3b所示的结构更有利于将 全部平行光 L分别进行透射和反射。
上述实施例中，各偏振光分光镜 61b的尺寸及其与第一导光板 4的夹角 都相等， 但不公开的实施例对此不作限定。 在本公开的其他实施例中， 各个 偏振光分光镜 61的尺寸以及与第一导光板 4的夹角也可以各不相等， 只要 各偏振光分光镜 61能够相互配合将全部平行光 L分为第一偏振光 L1和第二 偏振光 L2即可。
为了节省空间， 一般的， 背光装置 1为偏振光分光镜 61预留的空间都 较窄小， 因此， 在第一导光板 4 的一侧， 通常都设置有多个偏振光分光镜 61 , 例如至少 3个偏振光分光镜 61 , 以使每个偏振光分光镜 61与第一导光 板 4都具有合适的夹角。 可选的， 该至少 3个偏振光分光镜 61可以等间隔 或不等间隔地沿第一导光板 4的一侧错落设置， 以使各偏振光分光镜 61在 垂直于平行光 L的平面的投影互不重叠， 这样， 各偏振光分光镜 61就一起 对透过准直光学件 3的平行光 L进行了完整的透射和反射。
优选的， 结合图 1和图 4, 相邻的偏振光分光镜 61之间还可以设置有 第一隔光片 81 , 第一隔光片 81可以为不透光的材料形成的片状结构， 用于 分隔从偏振光分光镜 61中透射的第二偏振光 L2和尚未入射至相邻的偏振光 分光镜 61的平行光 L, 从而使第二偏振光 L2的成分更纯净。
具体的， 当偏振光分光镜 61将平行光 L分成第一偏振光 L1和第二偏 振光 L2后， 第一偏振光 L1被偏振光分光镜 61反射， 从而入射至第一导光 板 4, 第二偏振光 L2被偏振光分光镜 61透射， 从而入射至反光装置 7。
可选的， 反光装置 7具体可以为各种能够将光反射的装置， 如反光镜、 平面镜等。 由于反光装置 7需要将透射过偏振光分光装置 6的第二偏振光 L2全部反射至第二导光板 5, 因此， 从第二偏振光 L2传播的延续性上看， 反光装置 7和偏振光分光装置 6的位置应该是相对应的。 当偏振光分光装置 6为至少 1个偏振光分光镜 61时，反光装置 7也可以是至少 1个反光镜 71。
例如，在本公开的一个实施例中，偏振光分光装置 6为至少 3个偏振光 分光镜 61 , 那么， 反光装置 7也是至少 3个反光镜 71。 这些反光镜 71可以 等间隔地沿第二导光板 5的一侧错落设置， 且各反光镜 71的位置分别与偏 振光分光镜 61的位置相对应，以使从每个偏振光分光镜 61透射的第二偏振 光 L2入射到对应的反光镜。 相应的， 反光镜 71与第二导光板 5可以成 35 度至 55度夹角， 优选的， 该夹角为 45度， 以使第二偏振光 L2能以合适的 角度入射至第二导光板 5。
在本公开的其他实施例中，偏振光分光镜 61的个数与反光镜 71的个数 也可以不相等，只要保证从偏振光分光镜 61出射的第二偏振光 L2能够完全 被反光镜 71反射至第二导光板 5即可， 本公开实施例对此不作限定。
为了避免从偏振光分光镜 61 中透射的第二偏振光 L2泄漏， 优选的， 相邻的反光镜 71之间还可以设置有第二隔光片 （未显示）。 这样， 第二偏振 光 L2可以全部反射入第二导光板 5, 提高光利用率。
第二偏振光 L2被反光镜 71反射后即入射至第二导光板 5,与入射至第 一导光板 4的第一偏振光 L1一起作为为液晶显示装置等的光源。 这样， 背 光装置 1发出的光所分成的偏振方向相互垂直的第一偏振光 L1和第二偏振 光 L2就都能够被有效利用， 从而大大提高了背光装置 1的光利用率。
可选的， 第一导光板 4和第二导光板 5的相对位置可以为多种， 只要在 第一导光板 4和第二导光板 5的光输出方向上彼此不重叠、 第一偏振光 L1 与第二偏振光 L2分别从第一导光板 4和第二导光板 5射出后不混淆即可， 本公开的实施例对此不做限制。 但优选的， 为了合理利用背光装置 1中的空 间， 第一导光板 4和第二导光板 5位于同一平面内且彼此相接。 此外， 还可 以在第一导光板 4和第二导光板 5之间设置第三隔光片 （未显示）， 也就是 说第一导光板 4和第二导光板 5平铺在同一平面， 并通过第三隔光片相接， 以进一步保证第一导光板 4中的第一偏振光 L1和第二导光板 5中的第二偏 振光 L2不会相互干扰。
相应的， 本公开实施例所述的背光装置工作过程和工作原理描述如下：
511 , 通过准直光学件将光源发出的光转换为平行光入射至设置于第一 导光板一侧的偏振光分光装置；
512,通过偏振光分光装置将所述平行光分成第一偏振光和第二偏振光， 其中所述第一偏振光的偏振方向与所述第二偏振光的偏振方向相互垂直，所 述第一偏振光被所述偏振光分光装置反射后入射至第一导光板，所述第二偏 振光从所述偏振光分光装置透射后，入射至设置于第二导光板一侧的反光装 置； 以及
513, 通过所述反光装置将所述第二偏振光反射后入射至第二导光板。 具体的， 步骤 S12中，偏振光分光装置可以是任何能够将白光分成偏振 方向相互垂直的偏振光的装置， 本公开对此不作限定。 例如， 在本公开的一 个实施例中， 偏振光分光装置包括至少一个偏振光分光镜， 该偏振光分光镜 的主要功能部分为 3M公司生产的 DBEF。 在步骤 S12中， 可以通过至少一 个偏振光分光镜将该平行光分成第一偏振光和第二偏振光。偏振光分光镜的 具体个数和设置位置可以根据背光装置的结构设计而调整，前文已经进行了 详细的说明， 此处不再赘述。
可选的，在步骤 S 13中，反光装置具体可以为各种能够将光反射的装置， 如反光镜、 平面镜等。 由于反光装置也是需要将透射过偏振光分光装置的第 二偏振光全部反射至第二导光板， 因此， 从第二偏振光传播的延续性上看， 反光装置和偏振光分光装置的位置应该是相对应的。 当偏振光分光装置为至 少 1个偏振光分光镜时， 反光装置也可以是至少 1个反光镜。 步骤 S13中， 具体可以通过至少一个反光镜将第二偏振光反射后入射至第二导光板。
当然，在本公开的其他实施例中，偏振光分光镜的个数与反光镜的个数 也可以不相等，只要保证从偏振光分光镜出射的第二偏振光能够完全被反光 镜反射至第二导光板即可， 本公开实施例对此不作限定。
与前述的背光装置相对应， 本公开的实施例还提供一种液晶显示装置， 包括液晶显示面板， 以及前述任一实施例提供的背光装置。 液晶显示面板分 为第一显示部和第二显示部，第一显示部的位置与背光装置的第一导光板的 位置相对应， 第二显示部的位置与背光装置的第二导光板的位置相对应， 第 一显示部能够控制第一显示部中的液晶分子的排列以允许第一偏振光通过 实现显示，第二显示部能够控制第二显示部中的液晶分子的排列以允许第二 偏振光通过实现显示， 第一偏振光与第二偏振光的偏振方向相互垂直。
在本公开的实施例提供的液晶显示装置中，液晶显示面板分为第一显示 部和第二显示部两部分，所述第一显示部能够控制所述第一显示部中的液晶 分子的排列以允许所述第一偏振光通过，所述第二显示部能够控制所述第二 显示部中的液晶分子的排列以允许所述第二偏振光通过。 这样， 当通过第一 导光板和第二导光板为这两个显示部分别提供两种偏振方向相互垂直的偏 振光时，本公开实施例提供的液晶显示装置即可利用这两种偏振光进行图像 显示， 从而大大提高了液晶显示装置中背光装置的光利用率， 进而使得液晶 显示装置显示质量提高， 并且能节约能耗。
以上实施方式仅用于说明本公开， 而并非对本公开的限制，有关技术领 域的普通技术人员， 在不脱离本公开的精神和范围的情况下， 还可以做出各 种变化和变型， 因此所有等同的技术方案也属于本公开的范畴， 本公开的专 利保护范围应由权利要求限定。

Claims

权利要求书
1、 一种背光装置， 包括：
相邻设置在同一平面上的第一导光板和第二导光板；
设置于该第一导光板和第二导光板的一侧的光源；
设置于该第一导光板和第二导光板的该侧且在该光源之前的准直光学 件；
设置于所述第一导光板的该侧的偏振光分光装置； 以及
设置于所述第二导光板的该侧的反光装置， 所述偏振光分光装置， 被所述偏振光分光装置分成第一偏振光和第二偏振 光， 所述第一偏振光的偏振方向与所述第二偏振光的偏振方向相互垂直， 所述第一偏振光被所述偏振光分光装置反射后入射至所述第一导光板， 所述第二偏振光从所述偏振光分光装置透射后， 入射至所述反光装置， 被所 述反光装置反射后入射至所述第二导光板。
2、 根据权利要求 1所述的背光装置， 其特征在于， 所述偏振光分光装 置包括至少一个偏振光分光镜， 所述反光装置包括至少一个反光镜。
3、 根据权利要求 2所述的背光装置， 其特征在于， 所述至少一个偏振 光分光镜与所述第一导光板成 35度至 55度夹角，所述至少一个反光镜与所 述第二导光板成 35度至 55度夹角。
4、 根据权利要求 3所述的背光装置， 其特征在于， 所述至少一个偏振 光分光镜与所述第一导光板成 45度夹角， 所述至少一个反光镜与所述第二 导光板成 45度夹角。
5、 根据权利要求 1所述的背光装置， 其特征在于， 所述偏振光分光装 置包括至少 3个偏振光分光镜， 所述反光装置包括至少 3个反光镜。
6、 根据权利要求 5所述的背光装置， 其特征在于， 所述至少 3个偏振 光分光镜等间隔地沿所述第一导光板的该侧错落设置，以使各所述偏振光分 光镜在垂直于所述平行光的平面的投影互不重叠。
7、根据权利要求 6所述的背光装置， 其特征在于， 还包括第一隔光片， 设置于相邻的所述偏振光分光镜之间，用于分隔从所述偏振光分光镜中透射 的第二偏振光和尚未入射至相邻的偏振光分光镜的平行光。
8、 根据权利要求 6所述的背光装置， 其特征在于， 所述至少 3个反光 镜等间隔地沿所述第二导光板的一侧错落设置，所述至少 3个反光镜的位置 与所述至少 3个偏振光分光镜的位置相对应，以使从每个所述偏振光分光镜 透射的第二偏振光入射到对应的反光镜。
9、根据权利要求 8所述的背光装置， 其特征在于， 还包括第二隔光片， 设置于相邻的所述反光镜之间，用于避免从所述偏振光分光镜中透射的第二 偏振光的泄漏。
10、根据权利要求 1所述的背光装置，其特征在于，还包括第三隔光片， 设置于所述第一导光板和所述第二导光板之间。
11、 一种液晶显示装置， 包括液晶显示面板以及要求 1-10 中任一项所 述的背光装置， 其中， 所述液晶显示面板分为第一显示部和第二显示部， 所 述第一显示部的位置与所述背光装置的第一导光板的位置相对应，所述第二 显示部的位置与所述背光装置的第二导光板的位置相对应，所述第一显示部 控制所述第一显示部中的液晶分子的排列以允许所述第一偏振光通过实现 显示，所述第二显示部控制所述第二显示部中的液晶分子的排列以允许所述 第二偏振光通过实现显示。
PCT/CN2013/077957 2013-04-23 2013-06-26 背光装置及液晶显示装置 Ceased WO2014172991A1 (zh)

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