CN1588196A - Back light module with polarized light converting function - Google Patents

Back light module with polarized light converting function Download PDF

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Publication number
CN1588196A
CN1588196A CNA2004100690126A CN200410069012A CN1588196A CN 1588196 A CN1588196 A CN 1588196A CN A2004100690126 A CNA2004100690126 A CN A2004100690126A CN 200410069012 A CN200410069012 A CN 200410069012A CN 1588196 A CN1588196 A CN 1588196A
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light
backlight module
guide plate
plate
light guide
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CNA2004100690126A
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Chinese (zh)
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CN100437270C (en
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许时嘉
黄志濠
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友达光电股份有限公司
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Abstract

The invention is a backlight module with a function of polarized light conversion, including a reflection piece, a phase delay piece, a light guide plate, a light source and a secondary wavelength grating piece, where the phase delay piece is arranged on the reflection piece, and the light guide plate is arranged on the phase delay piece and has many microstructures on the surface, the light source is arranged at one side end of the light guide plate and the light emitted from the light source goes out of the light guide plate through these microstructures, and the secondary wavelength grating piece is arranged on the light guide plate to (1) allow P light to pass through; (2) make S light reflected, in which, the S light is reflected from the reflection piece at the bottom of the backlight module and converted to the P light because of passing through the phase delay piece twice, thus able to pass through the secondary wavelength grating piece.

Description

具有偏振光转换功能的背光模块 The backlight module having a polarization conversion function

技术领域 FIELD

本发明关于一种背光模块,特别是一种具有偏振光转换功能的背光模块。 The present invention relates to a backlight module, particularly to a backlight module having a polarization conversion function.

现有技术请参照图1,图1为现有液晶显示器示意图。 Referring to prior art FIG. 1, FIG. 1 is a schematic view of conventional liquid crystal display. 液晶显示器10包括一液晶面板12以及一背光模块14,背光模块14用以提供液晶面板12所需的光源。 The liquid crystal display 10 includes a liquid crystal panel 12 and a backlight module 14, module 14 for providing a backlight light source for liquid crystal panel 12.

液晶面板12包括一上偏振片124、一彩色滤光层121、一液晶层122、一TFT层123以及一下偏振片125,TFT层123中数组排列的像素电极可调控液晶层122中液晶分子16的旋转角度。 The liquid crystal panel 12 comprises an upper polarizer 124, a color filter layer 121, 122, a TFT liquid crystal layer, a layer 123 and a lower polarizer 125, a pixel electrode of the TFT array alignment layer 123 may be regulated liquid crystal layer 122 liquid crystal molecules 16 the angle of rotation.

来自背光模块14的光线穿过下偏振片125后,产生一偏振光,并进入透明的TFT层123,当TFT层123外加一电压时,可使液晶分子16产生不同的旋转角度,而在液晶层122产生不同的穿透率。 After the polarizing plate 125 from the backlight light 14 passes through the module, generating a polarized light, and enters the transparent layer 123 of the TFT, the TFT layer 123 when a voltage is applied, the liquid crystal molecules 16 can produce different rotation angles, and the liquid crystal layer 122 have different transmittance. 不同穿透率的光线使得液晶显示器10呈现出灰阶的画面,接着光线经过彩色滤光层121之后,则可以呈现出彩色的画面。 Different light transmittance of the liquid crystal display screen 10 showing a gray scale, and then the light after the color filter layer 121, it may exhibit a color picture.

由上述液晶显示器的基本显示原理可知,液晶层122中不同旋转角度的液晶分子16使光线产生不同穿透率,进而构成灰阶画面为液晶显示器其中一项关键技术。 The basic principle of the display can be seen from the above-described liquid crystal display, the liquid crystal layer 122 different angles of rotation of the liquid crystal molecules 16 have different transmittance of the light rays, thus to constitute a liquid crystal display screen gray scale one of the key technologies. 而由于液晶分子16对光线穿透率的调控,由图1所示的液晶分子16具有双折射效果,类似一椭圆偏光仪,可使特定方向的偏振光通过。 Since the regulation 16 to light transmittance of the liquid crystal molecules, the liquid crystal molecules 16 shown in FIG. 1 having a birefringence effect, a similar ellipsometry, polarized light passes through a specific direction can. 因此,进入液晶层122的光线必须是属于同一偏振方向的偏振光。 Thus, light entering the liquid crystal layer 122 must be of the same polarization direction of polarized light. 所以在现有的液晶显示器10之中,大部份需要一片或数片偏振片(例如图1中的标号124与125),使灯管所提供的非偏极化的光线,经过偏振片之后而成为具有特定偏振方向的偏振光。 Therefore, in the conventional liquid crystal display 10, or a majority of the number of polarizing plates need (e.g., reference numerals 124 and 125 in FIG. 1), so that the light bulb is provided a non-polarization of the polarizer after becomes polarized light having a specific polarization direction. 若此些偏振片并非设置在液晶面板12之中,则需要设置在背光模块14内。 These polarizing plates if this is not provided in the liquid crystal panel 12, it is necessary in the backlight module 14 is provided.

由上述现有的液晶显示器的介绍可知,为了使得背光模块14所提供的光线有良好的均匀度与辉度,因此灯管141所提供的光线经过层层的传导后,才由背光模块14出射并提供予液晶面板(图1标号12)。 It is seen from the above described conventional liquid crystal display, the light to the backlight module 14 is provided with a good brightness uniformity, so the light bulb 141 is provided after the conductive layers, only emission from the backlight module 14 and to provide a liquid crystal panel (reference numeral 12 in FIG. 1). 在此情形下,最后真正能被液晶面板12所利用的光线,往往不到灯管141所提供光线的百分之八,因此发光效率不高为现有液晶显示器长久以来的缺点。 In this case, the light can be really utilized last liquid crystal panel 12, the lamp 141 provided often less than eight percent of the light, the light-emitting efficiency is not high since the disadvantages of the conventional liquid crystal display for a long time. 尤其,关于图2所示侧端入光背光模块14大多应用在可携式的电子产品中,如笔记型计算机的屏幕,相较于直下式背光模块而言,可使用的灯管数目较少,因此发光效率对侧端入光的背光模块14而言更形重要。 In particular, on the light incident side end of the backlight module 14 shown in FIG. 2 mostly used in portable electronic products such as notebook computer screens, compared to the direct type backlight module, the fewer number of lamps can be used Therefore opposite ends of the light emission efficiency of the backlight module 14 in terms of the more important.

在背光模块14内部的光线传导过程中,光线经过偏振片145所产生的损失是极大的一寰,因为一般光线可分为比例各占百分之五十的P光与S光,因此,当光线通过偏振片145(或图1偏振片124、125)时,S光会被吸收,而造成百分之五十的光线损失。 In the course of conducting the light inside the backlight module 14, the loss of light through the polarizing plate 145 is produced a great atlas, because light can generally be divided into the proper mix of S and P light fifty percent of the light, and therefore, when light passes through the polarizing plate 145 (FIG. 1 or the polarizing plate 124,125), S is the light absorption loss of light caused by fifty percent.

在此说明现有偏振片145(或图1偏振片124、125)通常的制造方法及作用原理:关于偏振片的制造,通常是将特殊的长链型分子埋入可伸缩的透明塑料片中,将塑料片拉长以致使该长链型分子互相平行排列。 In this description the conventional polarizing plate 145 (FIG. 1 or the polarizing plate 124 and 125) normally manufacturing method and principle: For producing a polarizer, is usually a special long-chain molecules embedded in a transparent plastic sheet retractable the elongated plastic sheets are arranged parallel to each other so that the long-chain molecules. 如此一来,偏振片会将任何偏振方向顺着分子长轴的光线(S光)吸收,而与它们垂直的光线(P光)则可通过。 Thus, the polarization direction of the polarizer will any light along the major axis of the molecules (S light) absorption, and light (P light) by which they may be perpendicular. 因此来自导光板142的光线通过偏振片145时即产生了百分之五十的损失。 Thus light from the light guide plate 142 through the polarizing plate 145 which produce a fifty percent loss.

以下介绍现有侧端入光的背光模块。 The following describes the conventional backlight module side end of the light. 请参照图2,图2为现有背光模块示意图。 Referring to FIG. 2, FIG. 2 is a schematic view of the conventional backlight module. 背光模块14包括一灯管141、一导光板142、一反射片143、一偏振片145以及多层光学薄膜147。 The backlight module 14 includes a lamp 141, a light guide plate 142, a reflective sheet 143, a multilayer optical film polarizer 145, and 147.

灯管141设于导光板142的侧端,此种将光线由导光板142侧端入射的背光模块通常称为侧端入光(edge light)背光模块。 Lamp 141 provided on the side end of the light guide plate 142, this light is incident from the side end of the light guide plate of the backlight module 142 is generally referred to as the light incident side end (edge ​​light) backlight module. 灯管141通常采用冷阴极灯管。 Lamp 141 is typically cold cathode fluorescent lamp.

导光板142靠近灯管141的侧端具有一斜面1421,且导光板142的底部具有多个沟槽状结构(slot structure)1422。 142 near the side end of the light guide plate 141 lamp having an inclined surface 1421 and the bottom guide plate 142 having a plurality of groove-like structure (slot structure) 1422. 斜面1421使得入射的光线以特定的角度射向该些沟槽状结构1422,而使光线可出射导光板142。 Inclined surface 1421 so that the light incident at a specific angle toward the plurality of groove-like structure 1422, the light guide plate 142 may exit.

如图2所示,由沟槽状结构1422的分布密度,由靠近灯管之一端向另一端逐渐增加,其目的在于使得出射导光板142上、下表面的光线分布的更均匀。 As shown in FIG, 2 is gradually increased by the distribution density of the groove-like structure close to the one end 1422 of the tube to the other end, it is an object that emitted the light guide plate 142, a lower surface and more uniform light distribution. 避免导光板142较靠近灯管141的一侧端(图中左端)的亮度特别高,而产生亮度不均的情形。 Avoiding side end of the light guide plate 142 closer to the lamp 141 (FIG left end) of the luminance is particularly high, and the luminance unevenness case.

设置于导光板142下方的反射片143用来使光线可向上反射,以使来自灯管141的光线能有效地被导至导光板142的上表面(出光面)。 The light guide plate 142 disposed below the reflective sheet 143 may be used so that the light reflected upward, so that light from the lamp 141 can be effectively guided to the light guide plate 142 of the upper surface (the surface).

综上所述,如何有效地利用偏振片所吸收的S光,使得背光模块能够将其中灯管所发出的光线能被更有效地利用,为现有技术所缺乏。 In summary, how to effectively use light S is absorbed by the polarizer, so that the backlight module can be emitted from the lamp light which can be utilized more effectively, the prior art is lacking. 除此之外,如何在开发可将上述被吸收的S光加以利用的技术时,同时考虑到其应用于背光模块产品化的加工便利性,甚至考虑到其所花费的成本,以使得新技术不只能改善现有背光模块中发光效率偏低的缺点,并能快速地应用于生产线上,并投入目前蓬勃发展的液晶显示器市场中,为当前技术开发时的另一重点。 In addition, how the above may be the development of the absorbed light S to be the use of technology, taking into account its ease of processing of the product applied to a backlight module, it takes even considering the cost of such new technology not only improve the conventional backlight module disadvantage of low light emission efficiency, and can be quickly applied to the production line and put into a liquid crystal display currently booming market, the other focus of the current technology development.

因此,对于从事液晶显示器相关领域的研发人员而言,莫不致力于解决现有技术所仍然具有的缺点,以期能够更进一步提高背光模块的发光效率与品质,并因此而使液晶显示器产品的背光源品质提升后,进而提升其整体品质,加强其市场竞争力。 Thus, for researchers in the related art liquid crystal display, all working to address the prior art still have the disadvantage that, in order to improve the light emission efficiency can be further and quality of the backlight module, and thus the LCD backlight products after the quality improvement, and thus enhance their overall quality, enhance their market competitiveness.

发明内容 SUMMARY

本发明的主要目的在于提供一种具有偏振光转换功能的背光模块。 The main object of the present invention is to provide a backlight module having a polarized light conversion function.

本发明的另一目的在于改善现有背光模块发光效率偏低的缺点。 Another object of the present invention is to improve the low light emission efficiency of a conventional backlight module disadvantages.

本发明的另一目的在于提供一种易于产品化的背光模块。 Another object of the present invention is to provide an easy product of a backlight module.

本发明所提供的背光模块,其包括一反射片、一相位延迟片、一导光板、一光源、一次波长光栅片以及多层光学薄膜。 The present invention provides a backlight module, comprising a reflector, a phase retardation plate, a light guide plate, a light source, a wavelength of the grating plate and a multilayer optical film.

相位延迟片设置于反射片上,其为一二分之一波片与一四分之一波片的组合;由四分之一波片与二分之一波片互相配合,可使得来回通过的可见光均匀地产生二分之一波长的相位差。 Phase retardation plate disposed on the reflective sheet, which is a combination of twelve and a half wave plate quarter wave plate; a quarter-wave plate and the half wave plate cooperate with each other, can be passed back and forth so that the a phase difference uniformly visible wavelength of two.

而导光板亦设置于相位延迟片上方,其表面具有多个微结构,用以增加背光模块的均匀度。 Also provided in the light guide plate above the phase retardation plate, a surface having a plurality of microstructures for increasing the uniformity of the backlight module. 光源则设置于导光板侧端,其所发出的光线由在导光板内部产生全反射,而散布于导光板中,并由导光板表面的该些微结构,而出射导光板。 The light source is disposed on the light guide plate side end, it emitted light is totally reflected by the inside of the light guide plate, light guide plate and scattered by the micro structure of the surface of the light guide plate, the light guide plate is emitted.

次波长光栅片(sub-wavelength grating plate),设置于导光板上,其具有多个周期为数十奈米(nm)平行排列的条状结构,用以:(1)允许光线中偏振方向垂直该些次波长光栅的偏振光通过,并定义该些通过的偏振光为P光。 Sub-wavelength grating plate (sub-wavelength grating plate), disposed on the light guide plate having a plurality of periods of tens of nanometers arranged parallel stripe structure (nm), for: (1) allowing light in a polarization direction perpendicular the plurality of polarized light through the sub-wavelength grating, and is defined by the plurality of P polarized light.

(2)使光线中偏振方向平行该些次波长光栅的偏振光产生反射,并定义该些反射的偏振光为S光。 (2) so that the light polarization direction is parallel to the plurality of sub-wavelength grating reflected polarized light, and define the plurality of reflected light is S-polarized.

其中,该些S光会在背光模块底部的反射片再一次产生反射;并因为由次波长光栅片射向反射片,且再次反射回到次波长光栅片的过程中,该些S光会来回通过相位延迟片二次,因而转换成为P光。 Wherein the plurality of light S is generated again reflected at the reflection sheet of the backlight module base; and because the sheet by the secondary reflection wavelength toward the lenticular sheet, and the sheet sub-wavelength grating is reflected back again in the process, the plurality of light back and forth S by the second phase retardation plate, and thus the light is converted into P. 由此,S光转换成为P光而可通过次波长光栅片。 Thus, S P light converted into light by the sub-wavelength grating plate.

由次波长光栅片、四分之一波片、二分之一波片与反射片的配合,光源所提供的非偏极化的光线可近乎全数地转变成为P光。 A sub-wavelength grating plate, a non-quarter-wave plate, with the half wave plate and the reflection sheet, a light source provided by the polarized light can be almost fully converted light P.

多层光学薄膜设置于次波长光栅片上,其用以加强背光模块所提供的P光的均匀度与辉度;多层光学薄膜包括上、下扩散片与上、下棱镜片。 Multilayer optical film disposed on the sheet sub-wavelength grating, which is to strengthen the uniformity of light P and the luminance of the backlight module is provided; multilayer optical film comprising the upper and lower diffusing sheet, the prism sheet.

本发明提供了一种具有偏振光转换功能的背光模块,并改善了现有背光模块发光效率偏低与制作困难的缺点。 The present invention provides a backlight module having a polarized light conversion function, and improves the disadvantages of the conventional backlight module low emission efficiency and production difficult. 本发明利用次波长光栅片、相位延迟片及反射片的配合,成功地利用了现有技术中被吸收掉的S光,使光源所发出的光线更有效地利用。 The present invention utilizes sub-wavelength grating film, a phase retardation plate and a reflecting sheet with the successful use of the prior art light S is absorbed, so that the light emitted by the light source more efficiently. 并且利用二分之一波片,使得在可见光的范围之中,S光可均匀地转换为P光。 And using a half wave plate, such that in the range of visible light, S is the light can be uniformly converted light P. 且本发明背光模块在开发时兼顾到在生产上的便利性,其架构可快速地应用于生产线上,有利于产业的竞争力与发展。 And the backlight module of the present invention to take into account in the development of convenience in production, its architecture can be quickly applied to the production line, in favor of competitiveness and development of the industry.

附图说明 BRIEF DESCRIPTION

图1为现有液晶显示器示意图;图2为现有背光模块示意图;图3为本发明背光模块示意图;图4显示波长-相位差关系图;图5显示本发明另一实施例;图6显示本发明另一实施例;及图7显示本发明另一实施例。 Figure 1 is a schematic view of conventional liquid crystal display device; FIG. 2 is a schematic view of the conventional backlight module; FIG. 3 is a schematic of the present invention, a backlight module; FIG. 4 shows a wavelength - phase diagram; FIG. 5 shows another embodiment of the present invention; Figure 6 shows another embodiment of the invention; and FIG. 7 shows another embodiment of the present invention.

图号对照表液晶显示器 10 液晶面板 12彩色滤光层 121 液晶层 122TFT层 123 偏振片 124、125、145背光模块 14 灯管 141导光板 142 斜面 1421沟槽状结构 1422 反射片 143多层光学薄膜147 液晶分子 16P光 P S光 S背光模块 30 反射片 32相位延迟片 33 四分之一波片34二分之一波片36 导光板 38微结构 381 光源 40次波长光栅片42 条状结构 421多层光学薄膜44 第一曲线 L1 FIG number table liquid crystal display panel 10 liquid crystal 12 liquid crystal layer, color filter layer 121 polarizer layer 123 122TFT 124,125,145 lamp 14 of the backlight module 141 slant guide plate 142 1421 1422 trench structure 143 multilayer optical film reflective sheet 147 of the liquid crystal molecules 16P PS light S light of the backlight module 32 of phase retardation plate 30 reflection sheet 33 light guide quarter-wave plate 36 34 38 microstructures half wave plate 381 the light source 40 sub-wavelength grating structure strip sheet 42 over 421 a first layer of the optical film 44 curve L1

第二曲线 L2 第三曲线 L3第四曲线 L4具体实施方式请参照图3,图3为本发明背光模块示意图。 The second line L2 third curve L3 L4 fourth curve DETAILED DESCRIPTION Referring to FIG 3, which illustrates a schematic diagram of the present invention, a backlight module. 背光模块30具有偏振光转换的功能,其包括一反射片32、一相位延迟片33、一导光板38、一光源40、一次波长光栅片42以及多层光学薄膜44。 The backlight module 30 has a polarization conversion function, which comprises a reflector 32, a phase retarder 33, a light guide plate 38, a light source 40, a wavelength of the grating plate 42 and the multilayer optical film 44.

相位延迟片33设置于反射片32上,其为一四分之一波片34与一二分之一波片36的组合。 Phase retardation plate 33 is provided on the reflective sheet 32, which is a combination of a quarter-wave plate 34 and the half wave plate 36 of twelve.

而导光板38设置于相位延迟片33上方,其表面具有多个微结构381。 And the light guide plate 38 disposed above the phase retardation plate 33, the surface 381 having a plurality of microstructures. 其中每一微结构381具有一特定的斜面。 Wherein each microstructure 381 having a particular slope.

光源40则设置于导光板38侧端,光源38所发出的光线由在导光板38内部产生全反射,而散布于导光板38中,并由导光板38表面的该些微结构381,而出射导光板38。 The light source 40 is provided at the side end guide plate 38, the light emitted by the light source 38 is totally reflected inside the light guide plate 38, and scattered light guide plate 38, the light guide plate by the micro structure of the surface of 38 138, is emitted guide light board 38.

如图3所示,微结构381分布密度,由靠近光源40的一侧端向另一侧端逐渐增加,其目的在于避免背光模块30较靠近光源40的一侧端(图中左端)的亮度特别高,而产生亮度不均的情形次波长光栅片(sub-wavelength grating plate)42,设置于导光板38上,次波长光栅片38具有多个周期为数十奈米(nm)平行排列的条状结构421,其用以:(1)允许光线中偏振方向垂直该些条状结构421的偏振光通过,并定义该些通过的偏振光为P光。 Brightness As illustrated, a density distribution of the microstructures 381, gradually increases toward the other end side by the side closer to the light source 40 side, and its object is to avoid the backlight module 30 closer to one end (left end in FIG.) Of the light source 40 particularly high, and the case where unevenness in brightness sub-wavelength grating plate (sub-wavelength grating plate) 42, disposed on the light guide plate 38, sub-wavelength grating plate 38 having a plurality of cycles to several tens of nanometers are arranged in parallel (nm), stripe structure 421, which is used: (1) allowing light in a polarization direction perpendicular the plurality of stripe structure 421 by polarized light, and is defined by the plurality of P polarized light.

(2)使光线中偏振方向平行该些条状结构421的偏振光产生反射,并定义该些反射的偏振光为S光。 (2) the polarization direction of the light rays in the plurality of parallel stripe structure 421 of the polarized light reflection, and define the plurality of reflected light is S-polarized.

其中,该些S光会在背光模块30底部的反射片32再一次产生反射;并因为由次波长光栅片42射向反射片32,且再次反射回到次波长光栅片42的过程中,该些S光会来回通过相位延迟片33,产生二分之一波长的相位延迟,因而转换成为P光。 Wherein the plurality of light S is generated again reflected at the bottom of the reflective sheet of the backlight module 3032; and as directed by the reflection sheet sub-wavelength grating plate 4232, and the process returns to sub-wavelength grating reflection sheet 42 again, the these S light back and forth through the phase retardation plate 33, generating a phase delay of one-half wavelength, and thus light converted into P. 由此,背光模块30内部的S光转换成为P光,而可通过次波长光栅片42。 Thereby, the inside of the backlight module 30 S P light converted into light by the sub-wavelength grating plate 42. 由次波长光栅片42、相位延迟片33与反射片32的配合,光源40所提供的非偏极化的光线可近乎全数地转变成为P光。 A sub-wavelength grating plate 42, with the phase retardation plate 33 and the reflection sheet 32, light source 40 provided by the non-polarized light can be almost fully converted light becomes P.

如图3所示,多层光学薄膜44设置于次波长光栅片42上,其用以加强背光模块30所提供的光线的均匀度与辉度,实施时,多层光学薄膜44可包括上、下扩散片与上、下棱镜片。 3, the multilayer optical film 44 is disposed on 42, which is used to strengthen the light provided by the backlight module 30 and the luminance uniformity sheet sub-wavelength grating, the practice, the multilayer optical film 44 may include an upper, the diffusion sheet and the upper and lower prism sheet.

相较于现有技术使用偏振片145的背光模块14(图2),本发明背光模块30(图3)采用次波长光栅片42来取代现有技术中的偏振片145。 Compared to the prior art polarizing plate 145 of the backlight module 14 (FIG. 2), the backlight module 30 of the present invention (FIG. 3) using the sub-wavelength grating 145 polarizing plate 42 instead of the prior art. 在功效上而言,次波长光栅片42与偏振片145主要的不同在于:次波长光栅片42是将S光予以反射,而偏振片145则会吸收S光。 In effect, the sub-wavelength polarizing plate 42 and grating plate 145 the main difference is that: sub-wavelength grating 42 is a sheet reflecting the light to be S, and S polarizing plate 145 will absorb light.

且本发明利用背光模块中既有的反射片32配合相位延迟片33,使得被次波长光栅片42反射的S光可在来回经过其中的四分之一波片34时,产生二分之一波长的延迟(retardation)而造成相位差,而恰好能转换成为P光,大幅地改善了现有技术中因偏振片145所造成的光线损失。 When the present invention by the reflection sheet and the backlight unit 32 with the existing phase retardation plate 33, such that the lenticular sheet 42 is reflected by the sub-wavelength light may be S therein back and forth through the quarter-wave plate 34, to produce one-half wavelength retardation (retardation) caused by the phase difference, but just to be converted into light P, greatly improved the prior art due to the loss of light 145 caused by the polarizer.

在本发明部份实施例中,次波长光栅片是采用Moxtek公司的PPL、PBS或PBF系列产品。 Embodiment, is the use of sub-wavelength grating plate Moxtek's PPL, PBS products in part or PBF embodiment of the present invention. 在本发明另一实施例中,亦考虑在制作导光板38的射出成型模具时,预先设置与该些条状结构421相对应的结构于模具上,以将该些条状结构421与导光板38一体成型地制出。 In another embodiment of the present invention, are also considered in the production of the light guide plate 38 of the injection mold, it is provided in advance with the plurality of stripe structure 421 corresponding to the mold structure, to the plurality of stripe structure 421 and the light guide plate 38 are integrally formed out of the system. 导光板38的下表面为一体成型的微结构381外,其上表面保持平整,可便利于导光板38与次波长光片42的组合,为一有利于背光模块30整体制程速度的实施方式。 An outer lower surface of the light guide plate 381 micro structure 38 is integrally formed, which remains flat upper surface, the light guide plate may be conveniently sub-wavelength embodiments in combination with the light sheet 42, to facilitate a backlight module 30 of the overall process speed of 38.

请继续参照图3,本发明背光模块30之中,相位延迟片33除了包括上述的四分之一波片34之外,另具有一片二分之一波片36。 Still referring to FIG. 3, in the backlight module 30 of the present invention, the phase retardation plate 33 includes, in addition to the above-described quarter-wave plate 34 than the other has a half-wave plate 36. 由于本发明此设置方式主要是着眼于背光模块30所提供的光线并不是单一波长,而是包含了可见光的波长范围(约400~700nm)-背光模块仅设置四分之一波片34而未设置二分之一波片36时,虽然依然可以达到产生P光,且转换部份的S光的目的,然而在不同波长(不同色)的光线上,其效果会有所不同,而造成色偏问题,使得显示品质下降。 Since this arrangement of the present invention is mainly focused on a single wavelength of light is not provided by the backlight module 30, but includes the wavelength range (about 700nm 400 ~) of visible light - a backlight module is only provided quarter-wave plate 34 without when the half wave plate 36 is provided, can be achieved while still generating light P, S and converting part of the object light, but light in different wavelengths (different colors), the effect will be different, causing color partial problems, so that the display quality decline.

请参照图4,图4显示波长-相位差关系图。 Referring to Figure 4, Figure 4 shows a wavelength - phase diagram. 关于背光模块30中,二分之一波片与四分之一波片不同的设置方式,会对各种不同波长的光线,产生不同的相位差效果。 About the backlight module 30, half wave plate and the quarter-wave plate is provided in different ways, a variety of different wavelengths of light will produce different retardation effects.

图4中第一曲线L1与第二曲线L2,代表背光模块30仅设置有一片四分之一波片(图3的标号34),而未设置有二分之一波片(图3的标号34)时,光线经过该片四分之一波片后的相位差结果。 In FIG. 4 the first curve and the second curve L1 L2, on behalf of the backlight module 30 is provided with only a quarter-wave plate (reference numeral 34 in FIG. 3), is not provided with a half wave plate (FIG. 3 reference numeral when 34), the light passes through the quarter wave plate retardation film results.

第一曲线L1代表使用polycarbonate材质的四分之一波片的实施例,而第二曲线L2代表使用polyvinyl alcohol材质的四分之一波片的实施例。 The first curve L1 represents Example quarter-wave plate using polycarbonate material, but the embodiment of the second quarter-wave plate using the representative curve L2 polyvinyl alcohol material.

第三曲线L3与第四曲线L4代表同时设置一片四分之一波片(图3标号34)与一片二分之一波片(图3标号34)时,光线来回通过该片二分之一波片,并通过该四分之一波片一次的实验结果。 The third curve L3 and the fourth representative of the curve L4 is provided while a quarter-wave plate (reference numeral 34 in FIG. 3) and when a half wave plate (reference numeral 34 in FIG. 3), the sheet of light back and forth through one-half wave plate, and the experimental results of a quarter-wave plate.

第三曲线L3代表以polycarbonate材质的二分之一波片及四分之一波片的实施例,其中二分之一波片与四分之一波片的相对轴夹角为10度。 The third representative embodiment of the curve L3 half wave plate and quarter-wave plate of polycarbonate material, wherein the relative angle between the axis of the half wave plate and the quarter-wave plate is 10 degrees.

而第四曲线L4代表以polycarbonate材质的二分之一波片及四分之一波片的实施例,其中二分之一波片与四分之一波片的相对轴夹角为17.5度。 And a fourth representative embodiment of the curve L4 half wave plate and quarter-wave plate of polycarbonate material, wherein the half wave plate and the quarter wave plate relative to the shaft angle is 17.5 degrees.

比较第一~第四曲线(L1~L4),很明显地,同时设置有二分之一波片与四分之一波片时(L3,L4),不论是接近400nm的光线(接近紫光)或是接近700nm的光线(接近红光),其相位差皆较集中于四分之一波长,因此偏振光转换的效果会较均匀。 Comparing the first to fourth curve (L1 ~ L4), it is clear, while the half-wave plate is provided with a quarter-wave plate (L3, L4), both close to the 400nm light (violet close) or close to the 700nm light (red close), which are more concentrated phase to a quarter wavelength, the polarization conversion effect will be more uniform. 且其中以相对轴夹角介于9度~11度时效果较佳。 And wherein when the angle between axis 9 relative to degrees to 11 degrees was better. 而仅设置有二分之一波片时(L1,L2),仅有在550nm附近的光线的相位差较接近四分之一波长,如图4所示,其中L1接近400nm的相位差甚至已到达八分之三波长;因此,此类实施例的偏振光转换效果会较不均匀,例如波长550nm的光线的偏振光转换效果,会优于波长400nm的光线。 Provided with only a half-wave sheet (L1, L2 of), light only in the vicinity of the phase difference is closer to a quarter wavelength 550nm, shown in Figure 4, where L1 is even closer to the phase difference 400nm reaches three-eighths wavelength; therefore, such a polarization conversion effect of the embodiment will be less uniform, for example, a polarization conversion effect of the light wavelength of 550nm, 400nm wavelength light will be better.

本发明具有偏振光转换功能背光模块的部份具体实施方式将介绍如下,请配合图3。 DETAILED DESCRIPTION Part of the present invention has a polarization conversion function backlight module will be described below, please 3 with FIG.

背光模块30中,导光板38不再设置有图2的现有背光模块14中的斜面1421,如图3所示,导光板38靠近光源40的侧端为平整,如此的设计不但使得在制造导光板38时更为容易,而且在组装导光板38与光源40时因可不需考虑光源40与斜面的配合,因此组装更为简便。 The backlight module 30, the light guide plate 38 is provided with an inclined surface 1421 is no longer in the conventional backlight module 14 of FIG. 2, FIG. 3, the light guide plate 38 near the side end of the light source 40 is flat, so that such a design not only in the manufacture easier the light guide plate 38, and when assembled with the guide plate 38 by the light source 40 can be fitted without regard to the source and the inclined surface 40, thus assembling easier.

而导光板38底部的微结构381提供了多个细微的特定斜面,取代了现有背光模块14中的导光板142的斜面1421的功能(图2),微结构381可使得导光板38内部全反射的光线顺利出射导光板38。 While the bottom guide plate 38 of a plurality of microstructures 381 provides a slight bevel particular, replaces the functionality of the conventional light guide plate 14 backlight module 142 of the inclined surface 1421 (FIG. 2), such that the microstructure of the light guide plate 381 may be a full 38 reflected light exit the light guide plate 38 smoothly.

微结构381可为V-cut结构,或是具有特定斜面的凸块(Bump)结构(图5),其形成是可由制作导光板38的射出成型模具时,预先设置与微结构381相对应的结构于模具上,以将微结构381与导光板38一体成型制出。 Microstructures 381 may be a V-cut structure having a particular slope or bump (Bump) configuration (FIG. 5), which is formed by making the light guide plate 38 of the injection mold, and is set in advance corresponding to the microstructure 381 on the mold structure to the microstructure 381 are integrally formed with the light guide plate 38 made out. 此外,以V-cut结构为例,亦可在表面仍为平整的导光板38上利用V-cut刮刀以形成V-cut结构。 In addition, V-cut structure as an example, also using the V-cut blade remains flat on the surface of the light guide plate 38 to form a V-cut structure.

值得一提的是,图3所示乃本发明背光模块示意图,其中各组件可叠放入一框架之中,各组件彼此之间并未必有图3所示的间距。 It is worth mentioning that, in FIG. 3 is the schematic diagram of the backlight module of the present invention, in which various components may be placed in a stack frame, the pitch must not shown in FIG. 3 between components to each other. 且微结构381除了设置于导光板38下表面之外,在另一实施例中可设置于导光板38上表面(图6),且在另一实施例中可在导光板38之上、下表面皆设置有微结构381(图7)。 In addition to the microstructure and 381 disposed on the lower surface of the light guide plate 38 outside, in another embodiment, it may be provided on the upper surface of the light guide plate 38 (FIG. 6), and the embodiment may be on the light guide 38, in a further embodiment of the It is provided with surface microstructures 381 (FIG. 7).

综合以上所述,本发明提供了一种具有偏振光转换功能的背光模块,并改善了现有背光模块发光效率偏低与制作困难的缺点。 Based on the above, the present invention provides a backlight module having a polarized light conversion function, and improves the disadvantages of the conventional backlight module low emission efficiency and production difficult. 本发明利用次波长光栅片、相位延迟片及反射片的配合,成功地利用了现有技术中被吸收掉的S光,使光源所发出的光线被更有效地利用。 The present invention utilizes sub-wavelength grating film, a phase retardation plate and a reflecting sheet with the successful use of the prior art light S is absorbed, so that the light emitted by the light source is more effectively utilized. 并且利用搭配二分之一波片,使得在可见光的范围之中,S光可均匀地转换为P光。 And with the use of half wave plate, such that in the range of visible light, S is the light can be uniformly converted light P. 且本发明背光模块在开发时兼顾到在生产上的便利性,其架构可快速地应用于生产线上,有利于产业的竞争力与发展。 And the backlight module of the present invention to take into account in the development of convenience in production, its architecture can be quickly applied to the production line, in favor of competitiveness and development of the industry.

Claims (10)

1.一种偏振转换功能的背光模块,其特征在于,包括:一导光板,其表面设有多个微结构;一次波长光栅片,设于该导光板的上方,其具有多条状结构;一光源,设于该导光板的一端,该光源所发出的光线含有可通过上述条状结构的P光,以及可被上述条状结构反射的S光,其中P光与S光的相位相差二分之一波长;一相位延迟片,设于该导光板的下方;以及一反射片,设于该相位延迟片的下方,其中,该光源的光线在进入该导光板之后,在该导光板内部产生全反射,并利用上述微结构射出该导光板,其中P光可直接通过该次波长光栅片,而S光则必须经过该反射片的反射,以及经过该相位延迟片至少二次,使其相位延迟二分之一波长并转换成P光以通过该次波长光栅片。 A polarization conversion function backlight module comprising: a light guide plate, its surface is provided with a plurality of microstructures; a wavelength grating plate, disposed above the light guide plate having a plurality of strip-like configuration; a light source disposed at one end of the light guide plate, the light emitted from the light source can be obtained by containing the above-described light stripe structure P, S, and light may be reflected by the stripe structure, wherein the light phase P and a difference of two light S one half wavelength; a phase retardation plate, disposed below the light guide plate; and a reflective sheet disposed below the phase retardation plate, wherein the light source enters the light guide plate after, the interior of the light guide plate total reflection, and emitting the light guide plate by using the above-described microstructure, wherein P light directly through the sub-wavelength grating plate, and S is the light must be reflected by the reflection sheet, and through the phase retardation plate at least twice, so that phase delay and one-half wavelength of light is converted into P sub-wavelength grating through the sheet.
2.如权利要求1所述的背光模块,其特征在于,该相位延迟片至少包括一四分之一波片与一二分之一波片。 2. The backlight module according to claim 1, wherein the phase retardation plate comprising at least twelve and a quarter-wave plate HWP.
3.如权利要求2所述的背光模块,其特征在于,该四分之一波片与该二分之一波片以一特定的相对轴夹角相结合。 The backlight module according to claim 2, wherein the quarter-wave plate at a specific angle relative to the shaft in combination with the half wave plate.
4.如权利要求3所述的背光模块,其特征在于,该相对轴夹角介于9度~11度。 The backlight module as claimed in claim 3, characterized in that the relative angle between the shaft 9 degrees to 11 degrees.
5.如权利要求1所述的背光模块,其特征在于,该些微结构设置于该导光板的下表面。 The backlight module according to claim 1, wherein the micro structure is disposed on the lower surface of the light guide plate.
6.如权利要求1所述的背光模块,其特征在于,该些微结构设置于该导光板的上表面。 The backlight module as claimed in claim 1, wherein the micro structure is disposed on a surface of the light guide plate.
7.如权利要求1所述的背光模块,其特征在于,该些微结构为V-cut结构。 The backlight module according to claim 1, wherein the micro structure is a V-cut structure.
8.如权利要求1所述的背光模块,其特征在于,该些微结构为凸块结构。 The backlight module according to claim 1, wherein the micro structure is a bump structure.
9.如权利要求1所述的背光模块,其特征在于,该背光模块更包括多个光学薄膜设置于次波长光栅片上。 The backlight module according to claim 1, wherein the backlight module further comprises a plurality of optical films is provided on the sheet sub-wavelength grating.
10.如权利要求9所述的背光模块,其特征在于,该些光学薄膜包括一上扩散片、一下扩散片、一上棱镜片以及一下棱镜片。 10. The backlight module according to claim 9, wherein the plurality of the optical film comprises a diffusion sheet, a lower diffusion sheet, a prism sheet, and at the prism sheet.
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