WO2013143161A1 - 背光模组及液晶显示器 - Google Patents

背光模组及液晶显示器 Download PDF

Info

Publication number
WO2013143161A1
WO2013143161A1 PCT/CN2012/073628 CN2012073628W WO2013143161A1 WO 2013143161 A1 WO2013143161 A1 WO 2013143161A1 CN 2012073628 W CN2012073628 W CN 2012073628W WO 2013143161 A1 WO2013143161 A1 WO 2013143161A1
Authority
WO
WIPO (PCT)
Prior art keywords
light source
reflective surface
optical film
reflective
light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2012/073628
Other languages
English (en)
French (fr)
Inventor
方扩军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TCL China Star Optoelectronics Technology Co Ltd
Original Assignee
Shenzhen China Star Optoelectronics Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US13/519,321 priority Critical patent/US8654278B2/en
Publication of WO2013143161A1 publication Critical patent/WO2013143161A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

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
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors

Definitions

  • the present invention relates to the field of liquid crystal display technologies, and in particular, to a backlight module and a liquid crystal display.
  • FIG. 1 is a schematic structural view of an edge-lit backlight module.
  • the light source 11 is disposed on both sides of the light guide plate 12, and the light emitted from the light source 11 enters the light guide plate 12 and is uniformly emitted to the optical film 13.
  • the above technique for deriving the light of the light source 11 by the light guide plate 12 has the following problems:
  • the light guide plate 12 has the characteristics of thermal expansion and contraction, the light source 11 and the light incident surface 121 of the light guide plate 12 cannot be seamlessly connected, which limits the improvement of the coupling efficiency.
  • the light source 11 has a certain size and the opening angle of the light source 11 is large, such as a light emitting diode (Light)
  • the opening angle of the Emitting Diode (LED) can reach 90 degrees, but the thickness of the light guide plate 12 is fixed, and it is easy to cause light leakage of the light having a large angle in the light source 11.
  • the material of the light guide plate 12 can absorb part of the light.
  • the dot structures will absorb part of the light, resulting in a decrease in light utilization efficiency.
  • the light absorbing rate of the material of the light guide plate 12 is inconsistent with each wavelength band, a chromatic aberration occurs on the light exit surface 122 of the light guide plate 12 as the distance of light propagation in the light guide plate 12 increases.
  • the structure of the liquid crystal panel needs to be simplified, but the presence of the light guide plate 12 restricts the liquid crystal panel from being light and thin.
  • the light guide plate 12 increases the complexity of the design of the backlight module. For example, due to the phenomenon of warpage that may occur in the light guide plate 12, the design accuracy of other components in the liquid crystal panel needs to be re-adjusted.
  • the material cost of the light guide plate 12 is high, the production cost of the liquid crystal panel is increased.
  • the coupling efficiency between the light guide plate 12 and the light source 11 is low in the prior art; the absorption of light by the light guide plate 12 reduces the light utilization rate, resulting in chromatic aberration; and the light guide plate 12 restricts The trend of thinning and thinning of the liquid crystal panel increases design complexity and cost.
  • An object of the present invention is to provide a backlight module to solve the problem of reducing the light utilization efficiency of the light guide plate due to absorption of light by the light guide plate in the prior art, and the light guide plate increases the design complexity and cost of the backlight module, and the light guide plate and the light source.
  • Another object of the present invention is to provide a liquid crystal display to solve the problem of reducing the light utilization efficiency of the light guide plate due to absorption of light by the light guide plate in the prior art, and the light guide plate increases the design complexity and cost of the backlight module, and the light guide plate and the light source.
  • the invention constructs a backlight module comprising an optical film and a light source located on at least one side of the optical film, wherein:
  • the backlight module further includes a reflective cover and a reflective surface, the reflective surface and the optical film are symmetrically disposed with respect to the light source, and are located on the same side of the light source;
  • the reflector is located between the reflective surface and the optical film, and includes a first reflective layer for reflecting light emitted from the light source to the reflective surface, and for outputting from the light source The light is reflected to the second reflective layer of the optical film;
  • the first reflective layer has a first arc shape, and the first curved shape corresponds to a predetermined trajectory of the reflective surface, such that the first reflective layer The reflected light enters the reflective surface;
  • the reflective surface is a predetermined trajectory, and the predetermined trajectory is a non-uniform rational B-spline curve corresponding to the first reflective layer and the light source, and the light entering the reflective surface is under the preset trajectory After the reflective surface is reflected, it enters the optical film.
  • the second reflective layer has a second arc shape, and the second arc corresponds to the optical film such that light reflected by the second reflective layer enters the optical film sheet.
  • the light source includes a first light source and a second light source disposed between the optical film and the reflective surface and symmetrically disposed with respect to the optical film, the reflective surface including a first reflecting surface and a second reflecting surface that are symmetrical to each other, the first reflecting surface corresponding to the first light source, and the second reflecting surface corresponding to the second light source;
  • the first reflective surface extends along the predetermined trajectory in a direction away from the first light source; the second reflective surface extends along the predetermined trajectory in a direction away from the second light source; A junction of the reflective surface and the second reflective surface forms a projection that exits the optical film.
  • the light source includes a first light source on a side of the optical film
  • the reflecting surface extends in the predetermined trajectory in a direction away from the first light source.
  • Another object of the present invention is to provide a backlight module to solve the problem of reducing the light utilization efficiency of the light guide plate due to absorption of light by the light guide plate in the prior art, and the light guide plate increases the design complexity and cost of the backlight module, and the light guide plate and the light guide plate.
  • the present invention constructs a backlight module including an optical film, and a light source located on at least one side of the optical film;
  • the backlight module further includes a reflective cover and a reflective surface, the reflective surface and the optical film are symmetrically disposed with respect to the light source, and are located on the same side of the light source;
  • the reflector is located between the reflective surface and the optical film, and includes a first reflective layer for reflecting light emitted from the light source to the reflective surface, and for outputting from the light source Light reflected to the second reflective layer of the optical film;
  • the reflective surface has a predetermined trajectory corresponding to the first reflective layer and the light source. Under the predetermined trajectory, the light entering the reflective surface is reflected by the reflective surface and enters the optical film.
  • the first reflective layer has a first curved shape, and the first curved shape corresponds to a predetermined trajectory of the reflective surface, so that light reflected by the first reflective layer enters the Reflective surface;
  • the second reflective layer has a second arc shape, and the second arc corresponds to the optical film such that light reflected by the second reflective layer enters the optical film.
  • the light source includes a first light source and a second light source disposed between the optical film and the reflective surface and symmetrically disposed with respect to the optical film, the reflective surface including a first reflecting surface and a second reflecting surface that are symmetrical to each other, the first reflecting surface corresponding to the first light source, and the second reflecting surface corresponding to the second light source;
  • the first reflective surface extends along the predetermined trajectory in a direction away from the first light source; the second reflective surface extends along the predetermined trajectory in a direction away from the second light source; A junction of the reflective surface and the second reflective surface forms a projection that exits the optical film.
  • the light source includes a first light source on a side of the optical film
  • the reflecting surface extends in the predetermined trajectory in a direction away from the first light source.
  • the preset trajectory is a non-uniform rational B-spline curve.
  • Another object of the present invention is to provide a liquid crystal display to solve the problem of reducing the light utilization efficiency of the light guide plate due to absorption of light by the light guide plate in the prior art, and the light guide plate increases the design complexity and cost of the backlight module, and the light guide plate and the light source.
  • the present invention constructs a liquid crystal display, the liquid crystal display includes a backlight module, the backlight module includes an optical film, and a light source located on at least one side of the optical film;
  • the backlight module further includes a reflective cover and a reflective surface, the reflective surface and the optical film are symmetrically disposed with respect to the light source, and are located on the same side of the light source;
  • the reflector is located between the reflective surface and the optical film, and includes a first reflective layer for reflecting light emitted from the light source to the reflective surface, and for outputting from the light source Light reflected to the second reflective layer of the optical film;
  • the reflective surface has a predetermined trajectory corresponding to the first reflective layer and the light source. Under the predetermined trajectory, the light entering the reflective surface is reflected by the reflective surface and enters the optical film.
  • the first reflective layer has a first arc shape, and the first curved shape corresponds to a predetermined trajectory of the reflective surface, such that light reflected by the first reflective layer enters the reflection surface;
  • the second reflective layer has a second arc shape, and the second arc corresponds to the optical film such that light reflected by the second reflective layer enters the optical film.
  • the light source includes a first light source and a second light source disposed between the optical film and the reflecting surface and symmetrically disposed with respect to the optical film, the reflecting surface including each other a symmetric first reflective surface and a second reflective surface, the first reflective surface corresponding to the first light source, and the second reflective surface corresponding to the second light source;
  • the first reflective surface extends along the predetermined trajectory in a direction away from the first light source; the second reflective surface extends along the predetermined trajectory in a direction away from the second light source; A junction of the reflective surface and the second reflective surface forms a projection that exits the optical film.
  • the light source includes a first light source on a side of the optical film
  • the reflecting surface extends in the predetermined trajectory in a direction away from the first light source.
  • the predetermined trajectory is a non-uniform rational B-spline curve.
  • the present invention provides a reflecting surface corresponding to the optical film in the backlight module, and a reflecting cover is disposed at the light source, and the light emitted from the light source not only directly enters the reflecting surface and the optical film, but also Part of the reflection through the reflector enters the reflective surface and the optical film, and the reflective surface has a predetermined trajectory, so that all the light entering the reflective surface enters the optical film, which not only ensures better coupling efficiency, but also ensures The screen display effect, and because the light guide plate is not needed, the space and cost of the backlight module are saved, and the design of the backlight module is simplified.
  • FIG. 1 is a schematic structural view of a backlight module in the prior art
  • FIG. 2 is a schematic structural view of a first preferred embodiment of a backlight module according to the present invention
  • Figure 3 is a schematic view showing the paraboloid formation of the reflector of Figure 2;
  • Figure 4 is a schematic view showing the paraboloid of the reflector of Figure 2;
  • Figure 5 is a schematic view showing the direction of light emitted from the first light source in Figure 2;
  • FIG. 6 is a schematic structural view of a second preferred embodiment of a backlight module according to the present invention.
  • FIG. 7 is a schematic view showing the height of the reflective surface in FIG. 6 being equal to the height of the backlight chamber.
  • FIG. 2 is a schematic structural view of a first preferred embodiment of a backlight module according to the present invention.
  • the backlight module includes an optical film 21 , a first light source 22 , a second light source 23 , a reflective surface 24 , and a reflective cover 25 .
  • the reflective surface 24 includes a first reflective surface 241 and a second reflective surface 242. Taking the reflection cover 25 corresponding to the first light source 22 as an example, the reflection cover 25 includes a first reflective layer 251 and a second reflective layer 252.
  • the first light source 22 and the second light source 23 are located between the optical film 21 and the reflective surface 24 and are symmetrically disposed with respect to the optical film 21.
  • the reflecting surface 24 and the optical film 21 are symmetrically disposed with respect to the first light source 22 and the second light source 23, and are located between the first light source 22 and the second light source 23.
  • the reflective surface 24 includes a first reflective surface 241 and a second reflective surface 242 that are symmetric with each other, and the first reflective surface 241 corresponds to the first light source 22, The second reflecting surface 242 corresponds to the second light source 23 .
  • the first light source 22 is disposed between the first reflective layer 251 and the second reflective layer 252, and one end of the first reflective layer 251 is connected to the The first light source 22 has the other end connected to the optical film 21; one end of the second reflective layer 252 is connected to the first light source 22, and the other end is connected to the reflective surface 24.
  • the first reflective layer 251 of the reflective cover 25 corresponds to the first reflective surface 241 of the reflective surface 24 for reflecting light emitted from the first light source 22 to the first reflective surface 241;
  • the second reflective layer 252 of the reflector 25 corresponds to the optical film 21 for reflecting light emitted from the first light source 22 to the optical film 21.
  • the reflective surface 24 is in a predetermined trajectory, and the first reflective surface 241 is taken as an example. Under the preset trajectory, the light entering the first reflective surface 24 passes through the first reflective surface. After the reflection of 241, it completely enters the optical film 21.
  • the preset trajectory is preferably a non-uniform rational B-spline curve. Of course, other trajectories may be used, as long as all the light entering the reflecting surface 24 is reflected into the optical film 21, which is not one by one. List.
  • the first reflective layer 251 has a first curved shape, and the first curved shape corresponds to a predetermined trajectory of the first reflective surface 241, so that the light reflected by the first reflective layer 251 completely enters the first a reflective surface 24;
  • the second reflective layer 252 has a second arc shape, and the second curved shape corresponds to the optical film 21 such that light reflected by the second reflective layer 252 enters the optical film 21 .
  • the first reflective layer 251 having a first arc shape and the second reflective layer 252 having a second arc shape form a compound parabolic collimator (Compound) Parabola Collimator, CPC).
  • the light pattern is readjusted, and the angle of the reflected light is generally less than 30°, that is, the reflector 25 (composite parabolic collimator)
  • the axis of symmetry is the normal, and the angle between the reflected light and the normal is all distributed within ⁇ 30°.
  • FIG. 3 is a schematic view for explaining the paraboloidal formation of the reflector 25 of the present invention
  • FIG. 4 is a paraboloidal view of the reflector 25 of the present invention.
  • the symmetry axes are all in a paraboloid of a horizontal plane, and the respective axes of symmetry are offset from the horizontal plane by an angle, and the paraboloids are combined to form a compound paraboloid.
  • the paraboloid AOA' rotates the ⁇ angle counterclockwise
  • the paraboloid BOB' rotates the ⁇ ' angle counterclockwise
  • the curved surfaces BOA', AOB' combine to form a compound paraboloid.
  • the first reflective surface 241 extends in a non-uniform rational B-spline curve in a direction A1 away from the first light source 22;
  • the direction A2 of the second light source 23 extends in a non-uniform rational B-spline curve.
  • the intersection of the first reflective surface 241 and the second reflective surface 242 forms a protrusion 243 that faces the optical film.
  • the slope of the slope of the reflecting surface 24 in the direction A1 is: negative ⁇ zero ⁇ positive ⁇ zero ⁇ negative ⁇ zero ⁇ positive.
  • the depth of the reflector 25 is L
  • the reflector 25 is rotated clockwise by an angle ⁇ with respect to the horizontal plane
  • the aperture width U of the reflector 25 is in the middle of the reflective surface 24.
  • the height h', the edge height h of the reflecting surface 24, of course, the intermediate height h' may be greater than the edge height h, and the height H of the backlight cavity (and the space formed by the reflecting surface 24 and the optical film 21) .
  • the opening angle ⁇ of the light emitted from the first light source 22 is controlled to be less than 30°, and if the light emitting surface width of the first light source 22 is U′ and the opening angle is ⁇ ′, the reflection is
  • the above parameters of the cover 25 approximately satisfy the following relationship:
  • the rotation angle of the reflector cover 24 can be 0 ⁇ ⁇ ⁇ 30 °, and the embodiment takes 5 ⁇ ⁇ ⁇ 15 °; 0.2 ⁇ U/L ⁇ 0.8.
  • the working principle of the first preferred embodiment of the backlight module shown in FIG. 2 to FIG. 4 is as follows:
  • FIG. 5 is a schematic diagram showing the direction of the light emitted by the first light source 22 in the first preferred embodiment shown in FIG. 2.
  • the light 22 emitted from the first light source is divided into three parts, and a part directly enters the reflective surface 24 and the optical film 21, and is reflected by the reflective surface 24 or a series of processes such as reflection of the optical film 21 are emitted from the backlight module; another portion is reflected by the first reflective layer 251 of the reflective cover 25 and enters the first reflective surface 241, and a portion thereof is The second reflective layer 252 of the reflector 25 is reflected and enters the optical film 21.
  • the first reflective layer 251 has a first curved shape, and the first curved shape corresponds to the preset trajectory, so that the first reflective surface 241 has a predetermined trajectory (such as a non-uniform rational B-spline curve). All of the light reflected by the first reflective layer 251 enters the first reflective surface 241, and after being reflected by the first reflective surface 241, all enter the optical film 21.
  • the second reflective layer 252 of the reflector 25 has a second arc shape, the second arc corresponds to the optical film 21, so that all the light reflected by the second reflective layer 252 enters the optical Diaphragm 21.
  • the reflector 25 of the present invention can cause all the light that is not directly incident on the reflecting surface 24 and the optical film 21 to be reflected into the reflecting surface 24 and the optical film 21, which is greatly improved.
  • Light utilization Moreover, the light emitted from the first light source 22 can be reflected into the optical film 21 by the cooperation of the reflective cover 25 and the reflective surface 24, eliminating the prior art to introduce light through the light guide plate.
  • the process of the optical film 21 not only saves materials, but also avoids the technical problem that the light utilization efficiency is reduced due to the light absorption of the light guide plate, which simplifies the design of the backlight module and reduces the cost.
  • FIG. 6 is a schematic structural view of a second preferred embodiment of a backlight module of the present invention.
  • the second embodiment shown in FIG. 6 includes an optical film 21, a first light source 22, a reflecting surface 34, and a reflection cover 25.
  • the second preferred embodiment shown in FIG. 6 is different from the first preferred embodiment shown in FIG. 2 in that the second preferred embodiment is a single-sided illumination mode (including only the first light source 22), and The first preferred embodiment is a two-sided illumination mode (including a first source 22 and a second source 23).
  • the reflective surface 34 extends along a predetermined trajectory in a direction A3 away from the first light source 22, for example, the preset trajectory is a non-uniform rational B-spline curve extension, and of course other curves may be used as long as the reflection is entered.
  • the light from the face 34 is further reflected into the optical film 21, which is not enumerated here.
  • the invention provides a reflecting surface corresponding to the optical film in the backlight module, and a reflecting cover is arranged at the light source, and the light emitted from the light source not only directly enters the reflecting surface and the optical film, but also the other part is reflected by the reflecting cover. Entering the reflecting surface and the optical film, and the reflecting surface is in a predetermined trajectory, so that all the light entering the reflecting surface enters the optical film, which not only ensures better coupling efficiency, but also ensures the screen display effect, and
  • the use of a light guide plate eliminates the space and cost of the backlight module, and simplifies the design of the backlight module.

Landscapes

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

Description

背光模组及液晶显示器 技术领域
本发明涉及液晶显示技术领域，特别是涉及一种背光模组及液晶显示器。
 背景技术
随着液晶技术的不断发展，对液晶面板内各部件的要求越来越高。
请参阅图1，图1为侧光式背光模组的结构示意图。其中，光源11设置在导光板12的两侧，从所述光源11出射的光线进入所述导光板12后均匀出射至光学膜片13。
上述由所述导光板12将所述光源11的光线导出的技术存在以下问题：
第一、由于所述导光板12具有热胀冷缩的特性，所述光源11与所述导光板12的入光面121不能做到无缝连接，限制了耦光效率的提升。而且由于所述光源11具备一定的尺寸，且所述光源11的张角较大，譬如发光二极管（Light Emitting Diode，LED）的张角可达到90度，但是所述导光板12的厚度固定，极易造成所述光源11中角度较大的光线的漏光。
第二、所述导光板12的材料能够吸收部分光线。譬如若所述导光板12为网点结构，则这些网点结构将吸收部分光线，造成光线利用率的降低。而且由于所述导光板12的材料对各波段的光线吸收率不一致，因此随着光线在所述导光板12内传播距离的增加，在所述导光板12的出光面122会有产生色差现象。
第三、随着液晶面板轻薄化、简约化的趋势，需要对液晶面板的结构进行简化，但是所述导光板12的存在制约了液晶面板轻薄化。而且，所述导光板12增加了背光模组结构设计复杂度，譬如由于考虑到所述导光板12可能发生的翘曲等现象，液晶面板内其它部件的设计精准度都需要重新进行调整。而且，由于所述导光板12的材料成本居高不下，增加了液晶面板的生产成本。
综上，现有技术中所述导光板12与所述光源11之间的耦合效率低下；所述导光板12对光线的吸收降低了光线利用率，导致色差现象；且所述导光板12制约了液晶面板轻薄化趋势，增加了设计复杂度及成本。
 技术问题
本发明的一个目的在于提供一种背光模组，以解决现有技术中由于导光板吸收光线导致光线利用率降低，且导光板增加了背光模组的设计复杂度及成本，以及导光板与光源之间的耦合效率低下的技术问题。
本发明的又一个目的在于提供一种液晶显示器，以解决现有技术中由于导光板吸收光线导致光线利用率降低，且导光板增加了背光模组的设计复杂度及成本，以及导光板与光源之间的耦合效率低下的技术问题。
 技术解决方案
本发明构造了一种背光模组，包括光学膜片，以及位于所述光学膜片至少一侧的光源，其中：
所述背光模组还包括反射罩以及反射面，所述反射面与所述光学膜片相对所述光源对称设置，并位于所述光源的同一侧；
所述反射罩位于所述反射面和所述光学膜片之间，包括用于将从所述光源出射的光线反射至所述反射面的第一反射层，以及用于将从所述光源出射的光线反射至所述光学膜片的第二反射层；所述第一反射层呈第一弧形，该第一弧形对应所述反射面的预设轨迹，使得经所述第一反射层反射的光线进入所述反射面；
所述反射面呈一预设轨迹，所述预设轨迹为非均匀有理B样条曲线，对应所述第一反射层和所述光源，在该预设轨迹下，进入反射面的光线经所述反射面反射后进入所述光学膜片。
在本发明的背光模组中，所述第二反射层呈第二弧形，所述第二弧形对应所述光学膜片，使得经所述第二反射层反射的光线进入所述光学膜片。
在本发明的背光模组中，所述光源包括位于所述光学膜片和所述反射面之间，并相对所述光学膜片对称设置的第一光源和第二光源，所述反射面包括相互对称的第一反射面和第二反射面，所述第一反射面对应所述第一光源，所述第二反射面对应所述第二光源；
所述第一反射面沿远离所述第一光源的方向以所述预设轨迹延伸；所述第二反射面沿远离所述第二光源的方向以所述预设轨迹延伸；所述第一反射面和所述第二反射面交汇处形成一朝出所述光学膜片的凸起。
在本发明的背光模组中，所述光源包括位于所述光学膜片一侧的第一光源；
所述反射面沿远离所述第一光源的方向以所述预设轨迹延伸。
本发明的另一个目的在于提供一种背光模组，以解决现有技术中由于导光板吸收光线导致光线利用率降低，且导光板增加了背光模组的设计复杂度及成本，以及导光板与光源之间的耦合效率低下的技术问题。
为解决上述问题，本发明构造了一种背光模组，包括光学膜片，以及位于所述光学膜片至少一侧的光源；
所述背光模组还包括反射罩以及反射面，所述反射面与所述光学膜片相对所述光源对称设置，并位于所述光源的同一侧；
所述反射罩位于所述反射面和所述光学膜片之间，包括用于将从所述光源出射的光线反射至所述反射面的第一反射层，以及用于将从所述光源出射的光线反射至所述光学膜片的第二反射层；
所述反射面呈一预设轨迹，对应所述第一反射层和所述光源，在该预设轨迹下，进入反射面的光线经所述反射面反射后进入所述光学膜片。
在本发明的背光模组中，所述第一反射层呈第一弧形，该第一弧形对应所述反射面的预设轨迹，使得经所述第一反射层反射的光线进入所述反射面；
所述第二反射层呈第二弧形，所述第二弧形对应所述光学膜片，使得经所述第二反射层反射的光线进入所述光学膜片。
在本发明的背光模组中，所述光源包括位于所述光学膜片和所述反射面之间，并相对所述光学膜片对称设置的第一光源和第二光源，所述反射面包括相互对称的第一反射面和第二反射面，所述第一反射面对应所述第一光源，所述第二反射面对应所述第二光源；
所述第一反射面沿远离所述第一光源的方向以所述预设轨迹延伸；所述第二反射面沿远离所述第二光源的方向以所述预设轨迹延伸；所述第一反射面和所述第二反射面交汇处形成一朝出所述光学膜片的凸起。
在本发明的背光模组中，所述光源包括位于所述光学膜片一侧的第一光源；
所述反射面沿远离所述第一光源的方向以所述预设轨迹延伸。
在本发明的背光模组中，所述预设轨迹为非均匀有理B样条曲线。
本发明的又一个目的在于提供一种液晶显示器，以解决现有技术中由于导光板吸收光线导致光线利用率降低，且导光板增加了背光模组的设计复杂度及成本，以及导光板与光源之间的耦合效率低下的技术问题。
为解决上述问题，本发明构造了一种液晶显示器，所述液晶显示器包括一背光模组，所述背光模组包括光学膜片，以及位于所述光学膜片至少一侧的光源；
所述背光模组还包括反射罩以及反射面，所述反射面与所述光学膜片相对所述光源对称设置，并位于所述光源的同一侧；
所述反射罩位于所述反射面和所述光学膜片之间，包括用于将从所述光源出射的光线反射至所述反射面的第一反射层，以及用于将从所述光源出射的光线反射至所述光学膜片的第二反射层；
所述反射面呈一预设轨迹，对应所述第一反射层和所述光源，在该预设轨迹下，进入反射面的光线经所述反射面反射后进入所述光学膜片。
在本发明的液晶显示器中，所述第一反射层呈第一弧形，该第一弧形对应所述反射面的预设轨迹，使得经所述第一反射层反射的光线进入所述反射面；
所述第二反射层呈第二弧形，所述第二弧形对应所述光学膜片，使得经所述第二反射层反射的光线进入所述光学膜片。
在本发明的液晶显示器中，所述光源包括位于所述光学膜片和所述反射面之间，并相对所述光学膜片对称设置的第一光源和第二光源，所述反射面包括相互对称的第一反射面和第二反射面，所述第一反射面对应所述第一光源，所述第二反射面对应所述第二光源；
所述第一反射面沿远离所述第一光源的方向以所述预设轨迹延伸；所述第二反射面沿远离所述第二光源的方向以所述预设轨迹延伸；所述第一反射面和所述第二反射面交汇处形成一朝出所述光学膜片的凸起。
在本发明的液晶显示器中，所述光源包括位于所述光学膜片一侧的第一光源；
所述反射面沿远离所述第一光源的方向以所述预设轨迹延伸。
在本发明的液晶显示器中，所述预设轨迹为非均匀有理B样条曲线。
 有益效果
本发明相对于现有技术，通过在背光模组中设置一对应光学膜片的反射面，并在光源处设置一反射罩，从光源出射的光线除了直接进入反射面和光学膜片外，其余部分经过反射罩的反射进入反射面和光学膜片，且所述反射面呈预设轨迹，可以使得进入反射面的光线全部进入光学膜片，不仅保证了较好的耦光效率，进而保证了画面显示效果，而且由于无需使用导光板，节省了背光模组的空间以及成本，简化了背光模组的设计。
 附图说明
图1为现有技术中背光模组的结构示意图；
图2为本发明中背光模组的第一较佳实施例结构示意图；
图3为图2中反射罩的抛物面形成示意图；
图4为图2中反射罩的抛物面示意图；
图5为图2中从第一光源出射光线的走向示意图；
图6为本发明中背光模组的第二较佳实施例结构示意图；
图7为图6中反射面中间高度与背光腔高度相等时的示意图。
 本发明的最佳实施方式
以下各实施例的说明是参考附加的图式，用以例示本发明可用以实施的特定实施例。
请参阅图2，图2为本发明中背光模组的第一较佳实施例结构示意图。
所述背光模组包括光学膜片21、第一光源22、第二光源23、反射面24以及反射罩25。其中，所述反射面24包括第一反射面241和第二反射面242。以对应所述第一光源22的反射罩25为例，所述反射罩25包括第一反射层251和第二反射层252。
所述第一光源22和第二光源23位于所述光学膜片21和所述反射面24之间，并相对所述光学膜片21对称设置。所述反射面24与所述光学膜片21相对所述第一光源22和第二光源23对称设置，并位于所述第一光源22和所述第二光源23之间。
在图2所示的第一较佳实施例中，所述反射面24包括相互对称的第一反射面241和第二反射面242，所述第一反射面241对应所述第一光源22，所述第二反射面242对应所述第二光源23。
继续以所述反射罩25为例进行说明，所述第一光源22设置于所述第一反射层251和所述第二反射层252之间，所述第一反射层251的一端连接所述第一光源22，另一端连接所述光学膜片21；所述第二反射层252的一端连接所述第一光源22，另一端连接所述反射面24。
其中，所述反射罩25的第一反射层251对应所述反射面24的第一反射面241，用于将从所述第一光源22出射的光线反射至所述第一反射面241；所述反射罩25的第二反射层252对应所述光学膜片21，用于将从所述第一光源22出射的光线反射至所述光学膜片21。
在具体实施过程中，所述反射面24呈预设轨迹，以所述第一反射面241为例，在预设轨迹下，进入所述第一反射面24的光线经所述第一反射面241反射后完全进入所述光学膜片21。所述预设轨迹优选为非均匀有理B样条曲线，当然也可以是其它的轨迹，只要使得进入所述反射面24的光线全部反射进入所述光学膜片21即可，此处不一一列举。
所述第一反射层251呈第一弧形，所述第一弧形对应所述第一反射面241的预设轨迹，使得经所述第一反射层251反射的光线完全进入所述第一反射面24；所述第二反射层252呈第二弧形，所述第二弧形对应所述光学膜片21，使得经所述第二反射层252反射的光线进入所述光学膜片21。在本实施例中，呈第一弧形的所述第一反射层251和呈第二弧形的所述第二反射层252构成一复合抛物面准直器（Compound Parabola Collimator，CPC）。从所述第一光源22出射的光线经过所述反射罩25反射后，光型得到重新调整，反射后的光线的张角一般小于30°，即以所述反射罩25（复合抛物面准直器）的对称轴为法线，反射后的光线与法线的夹角全都分布在±30°的范围内。
请参阅图3和图4，图3为用于解释本发明中所述反射罩25的抛物面形成示意图，图4为本发明中所述反射罩25的抛物面示意图。
其中，对称轴均处于水平面的抛物面中，各自的对称轴相对水平面偏离一个角度，这些抛物面组合在一起可以形成复合抛物面。譬如在图3中，抛物面AOA'逆时针旋转θ角，抛物面BOB'逆时针旋转θ'角，则曲面BOA'，AOB'组合形成复合抛物面。
在具体实施过程中，选取合适的抛物面表达式，旋转合适的角度，使得抛物面AOA'的焦点接近抛物面BOB'，抛物面BOB'的焦点接近抛物面AOA'，进而使得曲面BOA'构成图4所示的所述反射罩25的复合抛物面。而且，本实施例中，将所述第一光源22和所述第二光源23的发光面贴近抛物面AOA'和抛物面BOB'的焦点所在平面，达到所述反射罩25（复合抛物面准直器）对所述第一光源22和所述第二光源23准直的效果。
在图2所示的第一实施例中，所述第一反射面241沿远离所述第一光源22的方向A1以非均匀有理B样条曲线延伸；所述第二反射面242沿远离所述第二光源23的方向A2以非均匀有理B样条曲线延伸。所述第一反射面241和所述第二反射面242交汇处形成一朝出所述光学膜片的凸起243。
在图2所示的实施例中，所述反射面24的沿方向A1的斜率变化趋势为：负数→零→正数→零→负数→零→正数。
请一并参阅图2和图4，所述反射罩25的深度为L，所述反射罩25相对水平面顺时针旋转角度δ，所述反射罩25的孔径宽度U，所述反射面24的中间高度h'，所述反射面24的边缘高度h，当然中间高度h'可大于边缘高度h，所述背光腔（及所述反射面24和所述光学膜片21组成的空间）的高度H。在具体实施过程中，控制从所述第一光源22出射的光线的张角γ小于30°，若所述第一光源22的发光面宽度为U'，张角为γ'，则所述反射罩25的上述各参数近似满足以下关系：
sinγ×U＝sinγ'×U'×cosδ；
对所述第一光源22来说，sinγ×U＝U'×cosδ；
由此所述反射罩24的旋转角度可取0≤δ≤30°，本实施例取5≤δ≤15°；而 0.2＜U/L＜0.8。
图2至图4所示的背光模组的第一较佳实施例的工作原理为：
请一并参阅图5，图5为图2所示的第一较佳实施例中所述第一光源22出射光线的走向示意图。所述背光模组在发光过程中，从所述第一光源出射的光线22分为三部分，一部分直接进入所述反射面24和所述光学膜片21，并经所述反射面24反射或者光学膜片21的反射等一系列过程后从所述背光模组射出；另一部分经所述反射罩25的第一反射层251反射后进入所述第一反射面241，还有一部分经所述反射罩25的第二反射层252反射后进入所述光学膜片21。
由于所述第一反射面241呈预设轨迹（譬如非均匀有理B样条曲线），所述第一反射层251呈第一弧形，且第一弧形对应所述预设轨迹，使得经所述第一反射层251反射的光线全部进入所述第一反射面241，经所述第一反射面241反射后全部进入所述光学膜片21。
而且，由于所述反射罩25的第二反射层252呈第二弧形，该第二弧形对应所述光学膜片21，使得经所述第二反射层252反射的光线全部进入所述光学膜片21。
显然，本发明中的反射罩25可以使得未直接射向所述反射面24和所述光学膜片21的光线全部反射入所述反射面24和所述光学膜片21，极大的提高了光线利用率。而且，通过所述反射罩25和所述反射面24的配合，可以将从所述第一光源22出射的光线反射进入所述光学膜片21，省去现有技术中通过导光板将光线导入所述光学膜片21的过程，不仅节省材料，还避免了由于导光板吸收光线导致光线利用率降低的技术问题，简化了背光模组的设计度，降低了成本。
图6为本发明中背光模组的第二较佳实施例的结构示意图。
图6所示的第二实施例包括光学膜片21、第一光源22、反射面34以及反射罩25。图6所示的第二较佳实施例与图2所示的第一较佳实施例不同之处在于，该第二较佳实施例为单侧发光模式（仅包括第一光源22），而第一较佳实施例为双侧发光模式（包括第一光源22和第二光源23）。
其中，所述反射面34沿远离所述第一光源22的方向A3预设轨迹延伸，譬如预设轨迹为非均匀有理B样条曲线延伸，当然也可以是其它曲线，只要使得进入所述反射面34的光线进一步反射进入所述光学膜片21即可，此处不一一列举。
图7为图6中当所述反射面34的中间高度h'（请一并参阅图2）与所述背光腔（及所述反射面34和所述光学膜片21组成的空间）的高度H相等时的示意图。
图6及图7所示的第二较佳实施例的工作原理请参阅针对图2和图5所示的第一较佳实施例的工作原理，此处不再赘述。
本发明通过在背光模组中设置一对应光学膜片的反射面，并在光源处设置一反射罩，从光源出射的光线除了直接进入反射面和光学膜片外，其余部分经过反射罩的反射进入反射面和光学膜片，且所述反射面呈预设轨迹，可以使得进入反射面的光线全部进入光学膜片，不仅保证了较好的耦光效率，进而保证了画面显示效果，而且由于无需使用导光板，节省了背光模组的空间以及成本，简化了背光模组的设计。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。
 本发明的实施方式
工业实用性
序列表自由内容

Claims (14)

  1. 一种背光模组，包括光学膜片，以及位于所述光学膜片至少一侧的光源，其中：
    所述背光模组还包括反射罩以及反射面，所述反射面与所述光学膜片相对所述光源对称设置，并位于所述光源的同一侧；
    所述反射罩位于所述反射面和所述光学膜片之间，包括用于将从所述光源出射的光线反射至所述反射面的第一反射层，以及用于将从所述光源出射的光线反射至所述光学膜片的第二反射层；所述第一反射层呈第一弧形，该第一弧形对应所述反射面的预设轨迹，使得经所述第一反射层反射的光线进入所述反射面；
    所述反射面呈一预设轨迹，所述预设轨迹为非均匀有理B样条曲线，对应所述第一反射层和所述光源，在该预设轨迹下，进入反射面的光线经所述反射面反射后进入所述光学膜片。
  2. 根据权利要求1所述的背光模组，其中，所述第二反射层呈第二弧形，所述第二弧形对应所述光学膜片，使得经所述第二反射层反射的光线进入所述光学膜片。
  3. 根据权利要求1所述的背光模组，其中，所述光源包括位于所述光学膜片和所述反射面之间，并相对所述光学膜片对称设置的第一光源和第二光源，所述反射面包括相互对称的第一反射面和第二反射面，所述第一反射面对应所述第一光源，所述第二反射面对应所述第二光源；
    所述第一反射面沿远离所述第一光源的方向以所述预设轨迹延伸；所述第二反射面沿远离所述第二光源的方向以所述预设轨迹延伸；所述第一反射面和所述第二反射面交汇处形成一朝出所述光学膜片的凸起。
  4. 根据权利要求1所述的背光模组，其中，所述光源包括位于所述光学膜片一侧的第一光源；
    所述反射面沿远离所述第一光源的方向以所述预设轨迹延伸。
  5. 一种背光模组，包括光学膜片，以及位于所述光学膜片至少一侧的光源，其中：
    所述背光模组还包括反射罩以及反射面，所述反射面与所述光学膜片相对所述光源对称设置，并位于所述光源的同一侧；
    所述反射罩位于所述反射面和所述光学膜片之间，包括用于将从所述光源出射的光线反射至所述反射面的第一反射层，以及用于将从所述光源出射的光线反射至所述光学膜片的第二反射层；
    所述反射面呈一预设轨迹，对应所述第一反射层和所述光源，在该预设轨迹下，进入反射面的光线经所述反射面反射后进入所述光学膜片。
  6. 根据权利要求5所述的背光模组，其中，所述第一反射层呈第一弧形，该第一弧形对应所述反射面的预设轨迹，使得经所述第一反射层反射的光线进入所述反射面；
    所述第二反射层呈第二弧形，所述第二弧形对应所述光学膜片，使得经所述第二反射层反射的光线进入所述光学膜片。
  7. 根据权利要求5所述的背光模组，其中，所述光源包括位于所述光学膜片和所述反射面之间，并相对所述光学膜片对称设置的第一光源和第二光源，所述反射面包括相互对称的第一反射面和第二反射面，所述第一反射面对应所述第一光源，所述第二反射面对应所述第二光源；
    所述第一反射面沿远离所述第一光源的方向以所述预设轨迹延伸；所述第二反射面沿远离所述第二光源的方向以所述预设轨迹延伸；所述第一反射面和所述第二反射面交汇处形成一朝出所述光学膜片的凸起。
  8. 根据权利要求5所述的背光模组，其中，所述光源包括位于所述光学膜片一侧的第一光源；
    所述反射面沿远离所述第一光源的方向以所述预设轨迹延伸。
  9. 根据权利要求5所述的背光模组，其中，所述预设轨迹为非均匀有理B样条曲线。
  10. 一种液晶显示器，其中，包括一背光模组，所述背光模组包括光学膜片，以及位于所述光学膜片至少一侧的光源；
    所述背光模组还包括反射罩以及反射面，所述反射面与所述光学膜片相对所述光源对称设置，并位于所述光源的同一侧；
    所述反射罩位于所述反射面和所述光学膜片之间，包括用于将从所述光源出射的光线反射至所述反射面的第一反射层，以及用于将从所述光源出射的光线反射至所述光学膜片的第二反射层；
    所述反射面呈一预设轨迹，对应所述第一反射层和所述光源，在该预设轨迹下，进入反射面的光线经所述反射面反射后进入所述光学膜片。
  11. 根据权利要求10所述的液晶显示器，其中，所述第一反射层呈第一弧形，该第一弧形对应所述反射面的预设轨迹，使得经所述第一反射层反射的光线进入所述反射面；
    所述第二反射层呈第二弧形，所述第二弧形对应所述光学膜片，使得经所述第二反射层反射的光线进入所述光学膜片。
  12. 根据权利要求10所述的液晶显示器，其中，所述光源包括位于所述光学膜片和所述反射面之间，并相对所述光学膜片对称设置的第一光源和第二光源，所述反射面包括相互对称的第一反射面和第二反射面，所述第一反射面对应所述第一光源，所述第二反射面对应所述第二光源；
    所述第一反射面沿远离所述第一光源的方向以所述预设轨迹延伸；所述第二反射面沿远离所述第二光源的方向以所述预设轨迹延伸；所述第一反射面和所述第二反射面交汇处形成一朝出所述光学膜片的凸起。
  13. 根据权利要求10所述的液晶显示器，其中，所述光源包括位于所述光学膜片一侧的第一光源；
    所述反射面沿远离所述第一光源的方向以所述预设轨迹延伸。
  14. 根据权利要求10所述的液晶显示器，其中，所述预设轨迹为非均匀有理B样条曲线。
PCT/CN2012/073628 2012-03-29 2012-04-09 背光模组及液晶显示器 Ceased WO2013143161A1 (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US13/519,321 US8654278B2 (en) 2012-03-29 2012-04-09 Backlight module and liquid crystal display

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201210088225.8 2012-03-29
CN201210088225.8A CN102620208B (zh) 2012-03-29 2012-03-29 背光模组及液晶显示器

Publications (1)

Publication Number Publication Date
WO2013143161A1 true WO2013143161A1 (zh) 2013-10-03

Family

ID=46560312

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2012/073628 Ceased WO2013143161A1 (zh) 2012-03-29 2012-04-09 背光模组及液晶显示器

Country Status (2)

Country Link
CN (1) CN102620208B (zh)
WO (1) WO2013143161A1 (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102901008A (zh) * 2012-09-11 2013-01-30 彩虹集团公司 一种无导光板侧边式led平面光源装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1658048A (zh) * 2005-04-08 2005-08-24 友达光电股份有限公司 背光模块
CN101004507A (zh) * 2006-01-21 2007-07-25 鸿富锦精密工业（深圳）有限公司 背光模组
CN101038598A (zh) * 2006-03-17 2007-09-19 清华大学 自由曲面反射器设计系统及方法
CN101236329A (zh) * 2007-02-01 2008-08-06 株式会社Ips先驱高新技术 液晶显示装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000011724A (ja) * 1998-06-26 2000-01-14 Toshiba Lighting & Technology Corp バックライト、これを用いた液晶表示装置および照明装置
CN101004515A (zh) * 2006-01-21 2007-07-25 鸿富锦精密工业（深圳）有限公司 直下式背光模组
CN101051118A (zh) * 2007-05-10 2007-10-10 浙江大学 基于cpc阵列和折反射自由曲面的背光板的设计方法及用途
CN101858566B (zh) * 2010-04-21 2012-02-08 刘姝 用于背光源组件中的光源反射器及其背光源组件

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1658048A (zh) * 2005-04-08 2005-08-24 友达光电股份有限公司 背光模块
CN101004507A (zh) * 2006-01-21 2007-07-25 鸿富锦精密工业（深圳）有限公司 背光模组
CN101038598A (zh) * 2006-03-17 2007-09-19 清华大学 自由曲面反射器设计系统及方法
CN101236329A (zh) * 2007-02-01 2008-08-06 株式会社Ips先驱高新技术 液晶显示装置

Also Published As

Publication number Publication date
CN102620208A (zh) 2012-08-01
CN102620208B (zh) 2015-12-09

Similar Documents

Publication Publication Date Title
WO2013143162A1 (zh) 背光模组及液晶显示器
WO2013033941A1 (zh) 背光模组及液晶显示器
WO2012071752A1 (zh) 背光模块及其导光板
WO2017202168A1 (zh) 显示面板及其制作方法、以及显示装置
WO2013143094A1 (zh) 背光模组及液晶显示器
WO2014047987A1 (zh) 一种液晶面板及其制作方法
US20200401024A1 (en) Active optical rotator and optical system for LCD projector
WO2013143095A1 (zh) 一种背光模组及采用该背光模组的液晶显示装置
JP5183284B2 (ja) 導光板及びその製造方法
WO2013155726A1 (zh) 背光模组及液晶显示器
WO2013143161A1 (zh) 背光模组及液晶显示器
CN109633969A (zh) 显示装置及其显示面板模组
WO2013071532A1 (zh) 平板显示装置、立体显示装置以及等离子显示装置
US20200089043A1 (en) Electro-optical device and electronic apparatus
WO2013143164A1 (zh) 背光模组及液晶显示器
WO2016127456A1 (zh) 阵列基板及液晶显示面板
WO2013149406A1 (zh) 背光模组及液晶显示器
WO2013149407A1 (zh) 背光模组及液晶显示器
WO2014115985A1 (ko) 유리 절단 장치
WO2023137779A1 (zh) 背光模组和液晶显示装置
CN112180666A (zh) 一种lcd投影机光学系统和投影方法
WO2013134933A1 (zh) 背光模组及液晶显示器
WO2018227862A1 (zh) 复合膜片、背光模组及显示装置
WO2016169072A1 (zh) 背光模组及液晶显示装置
WO2021042265A1 (zh) 导光基板及其制备方法、对向基板、液晶显示装置

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 13519321

Country of ref document: US

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12872579

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12872579

Country of ref document: EP

Kind code of ref document: A1