CN100350308C - Backlight with structured sufaces - Google Patents

Backlight with structured sufaces Download PDF

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Publication number
CN100350308C
CN100350308C CN 01812770 CN01812770A CN100350308C CN 100350308 C CN100350308 C CN 100350308C CN 01812770 CN01812770 CN 01812770 CN 01812770 A CN01812770 A CN 01812770A CN 100350308 C CN100350308 C CN 100350308C
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CN
China
Prior art keywords
surface
light guide
optical
light
film
Prior art date
Application number
CN 01812770
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Chinese (zh)
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CN1464955A (en
Inventor
M·E·加德纳
S·科布
W·D·克雷特曼
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3M创新有限公司
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Priority to US09/613,313 priority Critical patent/US7046905B1/en
Application filed by 3M创新有限公司 filed Critical 3M创新有限公司
Publication of CN1464955A publication Critical patent/CN1464955A/en
Application granted granted Critical
Publication of CN100350308C publication Critical patent/CN100350308C/en

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Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/0035Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/00362-D arrangement of prisms, protrusions, indentations or roughened surfaces
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/0035Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0038Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/0058Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/0061Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/007Incandescent lamp or gas discharge lamp
    • G02B6/0071Incandescent lamp or gas discharge lamp with elongated shape, e.g. tube

Abstract

一种背照灯,它包括:一光导向体(16);一光源(12),相对于光导向体(16)设置该光源,以将光线引入光导向体(16);以及一转向薄膜。 One kind of a backlight, comprising: a light guide member (16); a light source (12), the light source is disposed relative to the light guide body (16), to the light introduced into the light guide body (16); and a turning film . 光线结构(40)形成在光导向体(16)的一输出表面(18)和一背面(20)之一中。 Beam structure (40) formed in one of an output surface of the light guide body (16) (18) and a rear surface (20). 光学结构(40)被设置成从光导向体(16)引出光线。 The optical structure (40) is arranged to lead the light from the light guide body (16). 一背反射体(24)设置在背面(20)附近。 A back reflector (24) disposed in the vicinity of the rear surface (20). 形成包括一变化特性的光学结构(40),该变化特性被设置成遮盖光导向体(16)的输出中的不均匀性。 Forming an optical structure (40) comprises a change in characteristic, the characteristic variation is arranged to cover variations in output light guide (16) in the.

Description

光导 The light guide

技术领域 FIELD

本发明总地涉及一种背照灯,更具体地说,涉及一种包括在光导向体的一个或多个表面中形成有光学结构的光导向体的背照灯。 The present invention generally relates to a backlight and, more particularly, relates to a light guide member formed with the optical configuration of a backlight in the one or more surfaces of the light guide body.

背景技术 Background technique

诸如液晶显示器(LCD)装置之类的背照光显示器装置通常使用一楔形光导向体。 Such as a liquid crystal display (LCD) device or the like backlight display devices typically use a wedge-shaped light guide body. 楔形光导向体将来自大致呈线性的光源(例如冷阴极荧光灯)的光线结合到大致呈平面的输出。 Wedge-shaped light guide member light from the light source substantially linear (e.g., cold cathode fluorescent lamp) is coupled to a substantially planar output. 然后平面输出用于LCD的照明。 Then planar illumination for LCD output.

一种背照光显示器的性能测量是其均匀性。 One kind of performance measurement light backlight display is its uniformity. 用户易于从显示器的一个区域到下一个区域察觉到相对较小的显示器亮度的差异。 Users readily perceive from a region of the display to the next area to a relatively small difference in display brightness. 即使是相对较小的不均匀性也会使显示器的使用者非常烦恼。 Even relatively small non-uniformity of display will be very upset the user.

使离开光导向体的光散射的表面漫射体或整体漫射体(bulk diffuser)片材有时可用于遮盖或柔化不均匀性。 Leaving the light scattering surface of diffuser or light diffuser integral guide member (bulk diffuser) can sometimes be a sheet for covering or soften non-uniformities. 然而,这种漫射也会导致光线被引离较佳的观察轴线。 However, this diffusion also results in light being directed away from a preferred viewing axis. 最终结果可能是显示器的整体亮度沿较佳观察轴线降低,这是显示器装置的又一个性能测量。 The end result may be to reduce the overall brightness of the display along the preferred viewing axis, which is another performance measure of a display device.

出于主观立场,整体亮度的相对较小的升高或降低不象离散的不均匀性那样易于被显示器装置的用户察觉。 For subjective standpoint relatively small increase or decrease unevenness not as easily be perceived as discrete user display device of the overall brightness. 然而,即使是最小的整体亮度的降低,包括小得只能由客观测量察觉到的降低,也会使显示器装置的设计者沮丧。 However, even the smallest decreases in overall brightness including small that only by objective measurement of perceived reduction, the designer of a display device will also depressed. 这是由于显示器的亮度与显示器的功率要求紧密相关。 This is because display brightness and power requirements of the display are closely related. 如果可以在不增加所需功率的情况下增加整体亮度,则设计者实际上可将更少的功率分配给显示器装置,且仍能获得可接受的亮度级别。 If overall brightness can be increased without increasing the required power, the designer can actually allocate less power to the display apparatus, and still obtain an acceptable brightness level. 对于由电池供电的便携式装置来说,这将转变成更长的运行时间。 For battery powered portable devices, this will translate to longer running times.

发明内容 SUMMARY

根据本发明,一诸如光导向体、光学薄膜或透镜之类的光学元件形成有光学结构的预定的设计的图案。 According to the present invention, such as a light guide body, an optical film or an optical element with a lens or the like is formed in a predetermined optical structure design pattern. 可将光学结构设置成有选择地校正光学元件的输出中的不均匀性,或者可将光学结构设置成以预定和设计的方式影响显示器的性能。 The optical structure may be arranged to selectively correct unevenness in the output of the optical element or the optical structure may be arranged and designed in a predetermined way affect the performance of the display.

在本发明的第一方面中,一种具有一第一表面、一第二表面、一第一边缘和一第二边缘的光学透射薄膜形成有多个形成在第一表面中的光学结构。 In a first aspect of the present invention, having a first surface, a second surface, a first optically transmissive film edge and a second edge formed with a plurality of optical structures formed in the first surface. 将多个光学结构以预定图案设置在第一表面上,每个光学结构具有至少一种从包括波幅、周期和纵横比(aspect ratio)的组中选出的特性。 A plurality of optical structures in a predetermined pattern disposed on the first surface, each of the optical structure having at least one characteristic selected from the group consisting of amplitude, period, and an aspect ratio (aspect ratio) of. 每种特性具有一第一数值,该第一数值用于第一边缘和第二边缘之间的薄膜上的一第一预定位置,而特性具有一不同于第一数值的第二数值,该第二数值用于第一边缘和第二边缘之间的薄膜上的、一不同于薄膜上的第一预定位置的第二预定位置。 Each property has a first value, the first value for a first predetermined position on the film between the first edge and a second edge, the second value having a characteristic different from the first value, the second values ​​for the two films between the first edge and a second edge, a second predetermined position different from the first predetermined position on the film.

在本发明的另一方面中,本发明的结构是厚光学元件例如一光导向体楔块或平板的部分。 In another aspect of the present invention, the structure of the present invention is, for example, a portion of the light guide body a thick plate or wedge optical element. 通过注模法、铸造、压模法或通过将一具有该结构的薄膜粘合于厚光学元件,在厚元件上实现该结构。 By injection molding, casting, compression molding or by a film having a thickness of the structure is bonded to the optical element, the structure is realized on a thick element.

附图说明 BRIEF DESCRIPTION

本技术领域的普通技术人员通过以下结合附图对本发明的几个较佳实施例作出的详细叙述将会清楚本发明的许多优点和特征,其中相同的标号在全文中表示相同的部分,在附图中:图1是适合本发明的一个实施例的照明装置的立体图;图2是本发明的一个实施例的结合有光学结构的设计的图案的光学薄膜的立体图;图3是本发明的又一个实施例的结合有光学结构的设计的图案的光学薄膜的立体图;图4是本发明的又一个实施例的结合有光学结构的设计的图案的光学薄膜的立体图;图5是本发明的又一个实施例的结合有光学结构的设计的图案的光导向体楔块的立体图;图6是本发明的又一个实施例的结合有光学结构的同相设计的图案的光导向体楔块的立体图;图7是沿图6的线7-7截取的剖视图;图8是本发明的又一个实施例的结合有光学结构的异相设计的图案的 In the art by one of ordinary skill in the art will understand that many features and advantages of the present invention are described in detail several preferred embodiments of the present invention taken in conjunction with the accompanying drawings, wherein like reference numerals refer to like parts throughout the text, the attachment drawings: FIG. 1 is a perspective view of a lighting device according to an embodiment suitable for the present invention; FIG. 2 is a connection with an embodiment of the present invention is a perspective view of an optical film pattern design of the optical structure; FIG. 3 is another of the present invention in connection with one embodiment of a perspective view of an optical film pattern design of the optical structure; FIG. 4 is a combination of still another embodiment of the present invention is a perspective view of an optical film pattern design of the optical structure; FIG. 5 is another of the present invention in connection with one embodiment of a perspective view of a light guide patterns of the design of the optical structure of the wedge; FIG. 6 is a combination of still another embodiment of the present invention is a perspective view of a light guide member with the optical structure with design patterns wedge; 7 is a sectional view taken along line 7-7 of FIG. 6; FIG. 8 is a further embodiment of the combined structure of optical-phase design pattern embodiment of the present invention. 导向体楔块的立体图;图9是本发明的又一个实施例的结合有光学结构的设计的图案的线性透镜结构的立体图;图10是本发明的又一个实施例的结合有光学结构的设计的图案的圆形透镜结构的平面示意图;图11是图10所示的圆形透镜结构的立体示意图;图12是本发明的另一个较佳实施例的结合有光学结构的设计的图案的光学薄膜的立体图;图13是本发明的另一个较佳实施例的结合有光学结构的设计的图案的光学薄膜的立体图;图14是本发明的另一个较佳实施例的结合有光学结构的设计的图案的光学薄膜的立体图;图15是本发明的一个较佳实施例的结合有顶面中的光学结构的一第一设计的图案和底面中的光学结构的一第二设计的图案的光导向体的立体图;图16是图15所示的光导向体的侧视图;图17是本发明的一个较佳实施例的背照灯的分解立体图;图18是本 A perspective view of the guide member wedge; FIG. 9 is a combination of still another embodiment of the present invention is a perspective view of a linear lens structure pattern designed optical structure; FIG. 10 is a further combined embodiment of the optical configuration of a design embodiment of the present invention. a schematic configuration of a flat circular lens pattern; FIG. 11 is a perspective schematic view shown in FIG. 10 circular lens structure; FIG. 12 is a combination of another preferred embodiment of the present invention, the optical pattern designed optical structures a perspective view of the film; FIG. 13 is a combination of another preferred embodiment of the present invention, a perspective view of an optical film design pattern of optical structures; FIG. 14 is a combination of another preferred embodiment of the present invention are designed optical structures perspective view of an optical thin film pattern; FIG. 15 is a combination of a preferred embodiment of the present invention has a second light pattern of optical structures designed for a bottom surface of the first pattern and the design of the optical structure in the top surface a perspective view of the guide member; FIG. 16 is a side view of the light guide body shown in FIG. 15; FIG. 17 is an exploded perspective view of a backlight according to a preferred embodiment of the present invention; FIG. 18 is present 发明的一个较佳实施例的背照灯的分解立体图;图19是显示用于图17所示的背照灯的光输出分布的图形;图20是显示用于图18所示的背照灯的光输出分布的图形;图21是现有技术的背照灯的侧视图;图22是本发明的一个较佳实施例的背照灯的侧视图;图23-28是本发明的较佳实施例的背照灯的多种构造的侧视图。 An exploded perspective view of a backlight according to a preferred embodiment of the invention; FIG. 19 is a graph showing a pattern of the light output distribution of a backlight shown in FIG. 17; FIG. 20 is a backlight for the display shown in Figure 18 the output pattern of the light distribution; FIG. 21 is a side view of the backlight of the prior art; FIG. 22 is a side view of a preferred of the present invention, a backlight according to an embodiment; FIG. 23-28 are preferred according to the present invention a side view of various configurations of the backlight embodiment.

具体实施方式 Detailed ways

依据几个较佳实施例,尤其是依据适于使用在背照明系统中的光学薄膜或光导向体来叙述本发明,该背照明系统通常使用在平板显示器装置中,例如膝上型计算机显示器或桌上型平板显示器。 In terms of several preferred embodiments, particularly suitable for use in accordance with backlighting system an optical film or light guide body to describe the present invention, the backlighting system typically used in flat panel display devices, such as laptop computer displays or a desktop flat panel display. 然而,本发明并不限于该应用,本技术领域的普通技术人员将理解的是,它实际上可应用于任何光学系统,例如投射屏装置和平板电视机。 However, the present invention is not limited to this application, those skilled in the art will appreciated that it can be practically applied to any optical system, for example the projection screen devices and flat panel televisions. 还将理解的是,本发明可应用于诸如在移动电话、个人数字助理(PDA)、寻呼机之类中发现的小型LCD显示器装置。 It will also be understood that the present invention can be applied to small devices such as LCD displays found in a mobile telephone, a personal digital assistant (PDA), a pager class. 因此,本文所述的实施例不应被看作限制本发明的宽阔范围。 Thus, embodiments described herein should not be construed as limiting the broad scope of the invention.

请参见图1,一照明系统10包括一光源12;一光源发射体14;一光导向体16,该光导向体具有一输出表面18、一背面20、一输入表面21和一端面22;一靠近背面20的反射体24;一第一光线重定向元件26;一第二光线重定向元件28;以及一反射偏光镜30。 Referring to FIG 1, an illumination system 10 includes a light source 12; a light emitter 14; a light guide member 16, the guide body having a light output surface 18, a back 20, an input surface 21 and an end face 22; a close to the rear surface 20 of the reflector 24; a first light redirecting element 26; a second light redirecting element 28; and a reflective polarizer 30. 光导向体16可为楔形、其变型或一平板。 Light guide 16 may be wedge-shaped with a flat or variations. 众所周知,光导向体的用途是将来自光源12的光分布到一远大于光源12的区域,更具体地说,大致分布到由输出表面18构成的整个区域。 Is well known, the use of the light guide member from the light source is distributed to a much larger than the region 12 the light source 12, more specifically, substantially distributed throughout the region constituted by the output surface 18. 光导向体16最好还能以紧凑、薄的单元实现这些任务。 The light guide member 16 also preferably a compact, thin unit to achieve these tasks.

光源12可以是一将光线输入到光导向体16的边缘表面21的冷阴极荧光灯(Cold Cathode Fluorescent Lamp(CCFL)),而灯反射体14可以是一围绕光源12以形成灯腔的反射膜。 The light source 12 may be a the light input to the light guide member edge surface 16 of the cold cathode fluorescent lamp (Cold Cathode Fluorescent Lamp (CCFL)) 21, and the lamp reflector 14 may be a surround light source 12 to form a reflective film lamp cavity. 背反射体24位于光导向体16的后面、靠近背面20。 The light guide member 16 is located behind the back reflector 24, rear face 20. 背反射体24可以是一有效的背反射体,例如一漫反射膜或一镜面反射膜。 Back reflector 24 may be an efficient back reflector, such as a diffusely reflective film or a specular reflective film.

在图示的实施例中,边缘结合的光线从输入表面21向端面22传播,这是由全内反射(TIR)限定的。 In the illustrated embodiment, the edge binding 21 to the light propagation end surface 22, which is a total internal reflection (TIR) ​​from the input surface is defined. 通过使TIR无效可以从光导向体16引出光线。 Rays can be drawn from the light guiding body 16 by TIR invalid. 由于楔形角的原因,限定在光导向体16内的光线增加相对于顶壁和底壁的平面的入射角,使每个TIR回升。 Due to the wedge angle is defined within the light guide member 16 with respect to the angle of incidence of the light increases planar top and bottom walls of each TIR recovery. 因而,由于光线不再受到TIR的限制,其最终将折射出输出表面18,并与其形成一掠射角。 Accordingly, since the light is no longer limited by the TIR, which ultimately reflects the output surface 18, and forms a glancing angle. 将一些光线引出背面20。 The back surface 20 leads some rays. 通过背反射体24将这些光线反射回来,进入并通过光导向体16。 24 by the back reflector rays reflected back into and through the light guide member 16. 第一光线重定向元件26被设置成一转向薄膜,以使离开输出表面18的这些光线沿大致与较佳观察方向平行的方向重新定向。 A first light redirecting element 26 is arranged a turning film, so that these light rays away from the output surface 18 along a direction substantially parallel to redirect the preferred viewing direction.

仍然参见图1并简要参见图2,第一光线重定向元件26可以是一具有一第一表面32和一第二表面34的光透射光学薄膜。 Still referring to FIG. 1 Referring briefly to Figure 2, a first light redirecting element 26 may be a light transmissive optical film having a first surface 32 and a second surface 34. 在一转向薄膜应用中,第一表面32被设置成一输入表面,并且形成有棱镜44,它可以折射和反射沿较佳观察方向离开光导向体16的光线。 In a turning film applications, first surface 32 is provided to an input surface, and a prism 44 is formed, it can be refracted and reflected light in the preferred viewing direction away from the light guide body 16. 第二表面34因此是一输出表面。 The second surface 34 is thus an output surface. 棱镜可具有一大致均匀的结构,或者可具有一如同编号为No.09/415,873、提交于1999年10月8日的普通转让美国专利申请“具有可变角棱镜的光学薄膜”所述的非均匀结构,本文将援引其揭示内容作为参考。 Non prism may have a substantially uniform structure or may have "an optical film having a variable angle prism" as a No. No.09 / 415,873, filed on October 8, 1999, commonly assigned U.S. patent application of uniform structure, a reference to its disclosure herein by reference.

请返回参见图1,在照明系统10的每种结构中,可以不需要第二光线重定向元件28。 Please Referring back to FIG. 1, the structure of each of the illumination system 10 may not be required a second light redirecting element 28. 当第二光线重定向元件被包括在系统10中时,它可以是一漫射体、一透镜状分布器(lenticular spreader)或一棱镜薄膜,例如可从明尼苏达州圣保罗市的3M公司购得的3M亮度增强薄膜产品(作为BEFII或BEFIII出售)之类的亮度增强薄膜。 When the second light redirecting element is included in the system 10, it may be a diffuser, a lenticular spreader (lenticular spreader) or a prism film, for example, commercially available from Minnesota 3M Company, St. Paul, 3M brightness enhancement film product (sold as BEFII or BEFIII) brightness enhancement film or the like. 反射偏光镜30可以是一无机、聚合或胆甾醇(cholesteric)液晶偏光镜薄膜。 Reflective polarizer 30 may be an inorganic, polymeric or cholesteric (a cholesteric) liquid crystal polarizer film. 一适当的薄膜是漫反射偏光镜薄膜产品(作为DRPF出售)或镜面反射偏光镜薄膜产品(作为DBEF出售),它们都可从3M公司购得。 A suitable film is diffusely reflective polarizer film product (sold as DRPF) or specularly reflective polarizer film product (sold as DBEF), which can be available from 3M Company. 此外,至少可将第二光线重定向元件28和反射偏光镜30、并可能将第一光学重定向元件26结合成一单个光学元件。 Further, at least a second light redirecting element may be a reflective polarizer 28 and 30, and 26 may be incorporated into the first optical element redirects a single optical element. 题为“显示器照明装置和增加显示器照明装置中的亮度的方法”、编号为No.09/415,100、提交于1999年10月8日的普通转让美国专利申请叙述了几种这样结合的光学结构,本文将援引其揭示内容作为参考。 Entitled "Display lighting device and a lighting device to increase the brightness of the display method", No. No.09 / 415,100, commonly assigned filed on October 8, 1999 U.S. Patent Application describes an optical arrangement of several such binding, the cited herein by reference in its disclosure.

使用用于背照明的光导向体,例如光导向体16,在从光导向体输出的光线中通常具有不均匀性。 Using a light guide body back lighting, such as a light guide member 16, typically having a non-uniformity in light output from the light guide body. 这些不均匀性通常集中在输入表面21附近。 These inhomogeneities typically concentrated near the input surface 21. 为了遮盖通常被看作缺陷的不均匀性,通常使用一覆盖光导向体的输出表面的漫射体。 In order to cover the non-uniformity is generally regarded as a defect, usually a diffuser output surface of the light guide body is covered. 然而,一漫射体会降低显示器的整体亮度,并且不足以遮盖所有缺陷。 However, a diffuser to reduce the overall brightness of the display experience, and is not sufficient to cover all the defects.

如上所述,在照明系统10中,第一光线重定向元件26被设置成一转向薄膜,并且可具有一图2所示的结构。 As described above, in the illumination system 10, a first light redirecting element 26 is arranged a turning film, and may have a structure shown in FIG. 再次参见图2,薄膜包括一光学结构40(棱镜)的图案42,这些光学结构被设置成具有一异相可变波幅。 Referring again to FIG. 2, an optical film comprises a structure 40 (or prism) pattern 42, the optical structures are arranged to have a variable amplitude-phase. 对于转向薄膜应用来说,图案42形成在一表面上,该表面是薄膜的光线输入表面。 For turning film applications, the pattern 42 is formed on a surface which is light input surface of the film. 然而,在本文将要叙述的几个其它应用中,图案42可以形成在楔块、平板或薄膜的顶面和/或底面上。 However, in several other applications to be described herein, the pattern 42 may be formed in the wedge, the top surface of the plate or film and / or bottom surface. 对于图1所示的转向薄膜应用来说,除了形成在第一光线重定向元件26的第一表面32上的棱镜以外,第二表面34可以形成有光学结构。 The steering shown in FIG. 1 for film applications, in addition to the prisms on the first surface 26 of the element 32 is formed in the first light redirection, the second surface 34 may be formed with optical structures.

继续结合图2进行讨论,第一光学重定向元件26具有一第一边缘36和一第二边缘38。 Continue discussed in conjunction with FIG. 2, the redirection of the first optical element 26 has a first edge 36 and a second edge 38. 光学结构40在图案42中从第一边缘36朝第二边缘38延伸。 The optical structure 40 extends toward the second edge 38 from a first edge 36 in pattern 42. 每个光学结构40可具有许多特性,例如波幅、周期以及波峰和波谷46的纵横比。 Each optical structure 40 may have a number of characteristics, such as amplitude, period, and peaks and valleys of the aspect ratio of 46. 图案42还可以具有若干特性,例如光学结构40之间的间距p。 Pattern 42 may also have a number of characteristics, such as the pitch p between the optical structure 40. 图2所示的结构40具有波幅变化。 The structure shown in FIG. 240 having amplitude variation. 在第一光学重定向结构26的应用中,可将诸槽设置成使其波幅的变化与光源12(图1)垂直。 In the first application of the optical redirection structure 26, the slots may be arranged so that amplitude variation of the light source 12 (FIG. 1) vertically.

继续参见图2,显然在图案42中,光学结构40在第一边缘36处形成有数量更大的波幅变化,该波幅变化的数量朝第二边缘38减少。 Continuing to refer to FIG. 2, it is clear in the pattern 42, the optical structures 40 have a greater number of amplitude variation is formed at a first edge 36, the amplitude change amount reduced toward the second edge 38. 由于表面斜度越高,光学结构40中的数量更大的波幅变化沿槽轴线产生越大的光功率。 Since the higher the slope of the surface, the number of optical structures 40 greater amplitude varies along the groove axis to produce a larger optical power. 那么,该图案的光功率随离开第一边缘36的距离的一函数而减少。 Then, the optical power of the pattern with a function of the distance away from the first edge 36 is reduced. 这种光学结构40和图案42的设置是有目的的。 This pattern of optical structures 40 and 42 are provided with a purpose. 如同所述,光导向体16的输出中的不均匀性可以集中在输入表面21附近,而距离输入表面21越远处的不均匀性越少。 As the light guide member 16 in the output unevenness can be concentrated near the input surface 21, and the smaller the unevenness in the distance from the input surface 21 distant. 因而,光学结构40和图案42被设置成在第一边缘36附近提供更多的漫射。 Thus, the optical structure 40 and pattern 42 are arranged to provide more diffusion near first edge 36. 在应用中,第一边缘36基本上被设置在光导向体16的输入表面21附近。 In application, first edge 36 is disposed substantially in the vicinity of the light input surface 16 of the guide body 21. 图案42具有一间距p,该间距可以是均匀或可变的,而光学结构40的波幅朝第二边缘38减少为零。 Pattern 42 having a pitch p, which may be uniform or variable pitch, and amplitude 40 of the optical structure 38 reduces to zero toward the second edge. 如同下面将更详细讨论的那样,可以用任何工具形状来制造该图案。 As will be discussed in detail below, the tool shape can be manufactured by any of the pattern.

应予理解的是,使用光线跟踪和其它分析技术,可以确定用于光学结构40和图案42的特定设置,这些设置可以最好地校正光导向体16的输出中特别观察到的不均匀性。 It should be appreciated that using ray tracing and other analysis techniques, may be determined for a particular configuration 40 and an optical pattern 42, these settings can be best output nonuniformity correction light guide 16 is particularly observed in the body. 也就是说,可以设计光学结构40和图案42的一个或多个特性,以校正特定的不均匀性。 That is, a design of the optical structure 42 or more characteristics of the pattern 40 and to correct a particular non-uniformity. 如上所述,关于第一光线重定向元件26,光学结构40和图案42将光功率提供给输入表面21附近的光导向体16的输出,以便遮盖可能出现在输入表面21附近的不均匀性。 As described above, the first light redirecting element 26, the optical structure 40 and pattern 42 to the output optical power of the input light guide 21 near the surface of the body 16 so as to cover the unevenness may occur near the input surface 21. 因为通常离输入表面21更远处从光导向体16观察到强度较弱或较小的不均匀性,所以远离输入表面21处提供的光功率较少或不提供光功率。 21 farther because usually 16 or less were observed weaker intensity unevenness, so less away from the input surface of the light power provided at 21 or no optical power from the input surface from the light guide. 以该种方式,在最需要遮盖或柔化不均匀性的位置提供光功率,而在待遮盖的不均匀性较少的位置提供较少的光功率。 In this manner, the optical power provided to be less covered position unevenness less need to cover most or soften position unevenness provide optical power. 此外,通过增加光学结构和/或改变光学结构的特性,事实上可将光功率增加到光导向体输出的任何位置。 Further, by increasing the optical structure and / or structural changes of the optical characteristics of the optical power is increased in fact be any position of the light guide body output. 此外,光功率的增加无需是均匀的。 In addition, increased optical power need not be uniform. 取而代之的是,如果必要的话,可根据需要将光功率增加到光导向体输出的离散区域,以协助遮盖缺陷或造成特定的光学效果。 Instead, if necessary, according to a discrete area in need of increased optical power output from the light guide body, to assist or to cover defects caused by a specific optical effect.

一些光导向体在光导向体背面包括漫射点的图案。 Some of the light guide member guiding the rear surface of the light diffusing pattern comprises dots. 入射到该诸点之一的光线被漫射点散射,并且使该反射光的一部分离开光导向体。 One of the points of the incident light is diffused scattered point, and the part of the reflected light out of the light guide body. 尽管这种从光导向体引出光线的方法的漫射性质,但诸点的图案本身在光导向体输出中是可见的。 Although this extraction from the light guide body of the light diffusing properties of the method, but the points of the pattern itself is visible in the light guide body output. 因而,为了隐藏点图案,通常提供另外的漫射。 Accordingly, in order to hide the dot pattern, additional diffusion is typically provided.

请结合图3,一薄膜50具有一表面52,形成该表面使其包括多个设置在图案56中的光学结构54。 Please conjunction with FIG. 3, a film 50 having a surface 52, which surface is formed to include a plurality of setting an optical structure 54 of the pattern 56. 光学结构54基本上被设置成替换用于从光导向体引出光线的漫射点图案。 The optical structure 54 is arranged substantially diffusion dot pattern replacement for extracting light from the light guide body. 尽管在图3中显示为椭圆形,但并没有将光学结构54共同局限于任何特定形状,也没有将它们局限于图案56中的任何一个特定形状。 Although shown as an oval in FIG. 3, but did not co-optical structures 54 be limited to any particular shape, they are not limited to any one particular shape of the pattern 56. 因此,光学结构54可以是棱柱、直线、点、正方形、椭圆形、圆形、菱形或大致呈任何形状或各种形状的组合。 Thus, the optical structures 54 may be prisms, lines, points, square, oval, circular, diamond, or substantially any shape or combination of various shapes. 此外,可以将光学结构54的尺寸制造得非常小,并且在图案56中紧密间隔在一起,从而比漫射点图案中的诸点的尺寸和间隔小得多。 Further, the size of the optical structure 54 is made very small and closely spaced together in a pattern 56, so that the diffusion ratio of the points of the dot pattern size and spacing smaller. 例如,光学结构可具有达到用于漫射点的典型尺寸的尺寸,但最好小于人眼的敏锐度,并且可以互相间隔在大约50-100微米内。 For example, the optical structure may have a typical size for diffusion to reach point size, but preferably less than the acuity of the human eye, and may be spaced from each other in the range of about 50-100 microns. 光学结构54的极小尺寸和紧密间隔消除或减少了光导向体输出所需的漫射,这通常是隐藏漫射点的图案所必需的。 The optical structure of extremely small size of 54 and closely spaced to eliminate or reduce the light output desired diffusion guide body, which is usually hidden diffusing pattern of dots necessary.

请参见图4,光学薄膜51具有一表面53,该表面形成多个设置在图案57中的光学结构55。 Referring to Figure 4, an optical film 51 having a surface 53, which surface is formed a plurality of optical structures 55 disposed in a pattern 57. 在本发明的该实施例中,光学结构55形成圆圈或点。 In this embodiment of the invention, the optical structure 55 forming a circle or dot. 图5示出了一具有背面61的光导向体楔块59,该背面形成有设置在图案65中的光学结构63。 Figure 5 shows a wedge light guide body 59 having a rear surface 61, the back surface of the optical structure 63 is formed with a pattern 65 provided in the. 这些光学结构也被图示成圆圈或点,但应当清楚的是,光学结构事实上可以采用任何结构。 These optical structure is illustrated as a circle or the point, it should be clear that in fact the optical structure may employ any configuration.

本发明允许并为光导向体提供微级的斜度变化。 The present invention provides a micro-level, and allows the inclination variation of the light guide body. 也就是说,通过微级增加光学结构可以局部增加或减少光导向体的斜度。 That is, by increasing the micro-optical structures may be locally increased or decreased level inclination of the light guide body. 当光线射到更高的正斜度时,从光导向体引出光线的速度将比光线射到标称楔形角更快。 When light is incident on a higher positive slope, the speed of light extraction from the light guide body than the light incident faster nominal wedge angle.

尽管至此为止依据光学薄膜进行讨论,但本发明可应用于光导向体楔块本身。 Although the discussion so far based on the optical film, but the present invention is applicable to a light guide member wedge itself. 请参见图6和7,一光导向体60具有一输入表面62、一输出表面64和一背面66。 See Figure 6 and 7, a light guide body 60 has an input surface 62, an output surface 64 and a rear surface 66. 输入表面62被设置成位于光源(图中未示出)附近,以提供入射到输入表面62的光源。 Input surface 62 is arranged to be located light source (not shown) near to provide a light source is incident to the input surface 62. 作为使光导向体60内的TIR无效的结果,入射到输入表面62的光线被引出输出表面64。 As so TIR light guide body 60 in the invalid result, light rays 62 incident on the input surface of the output surface 64 is drawn. 如同上面所讨论的那样,从光导向体60输出的光线中通常具有不均匀性,尤其是在输入表面62附近。 As discussed above, the light from the light guide body 60 generally has the output of non-uniformity, particularly near the input surface 62.

图7示出了将光功率增加到光导向体60的背面66和调整延伸离开输入表面62的强度。 FIG 7 shows the light intensity of the optical power is increased to the back of the guide member 66 and adjustment 60 extending away from the input surface 62. 如图6所示,背面66形成有同相光学结构68,该光学结构被设置成增强输入表面62附近的引出,并且随其离开输入表面62而逐渐减少到零。 6, the back surface 66 are formed with the same optical structure 68, which is provided to enhance the optical extraction structures near the input surface 62, and it exits with the input surface 62 is gradually reduced to zero. 图案在整个表面上也可以是不逐渐减少的,即恒定的,它从零开始增加,任意变化或分布在离散区域中。 Over the entire surface pattern may not be gradually reduced, i.e. constant, it is increased from zero, or any change in the distribution of discrete areas. 光学结构也可以是异相的,例如图8所示的光导向体60'的背面66'中形成光学结构68'。 Forming an optical structure 68 '' of the back surface 66 'of the optical structure may be out of phase, such as a light guide body 60 shown in Fig. 应予理解的是,光学结构的图案也可以单独形成在输出表面64中,或者与形成在背面66中的图案相结合——下面将更详细地叙述本发明的这种实施例,尤其是结合图15和16。 It should be appreciated that the pattern of optical structures may be separately formed in the output surface 64, or the pattern formed on the back surface 66 in combination - described in detail below in greater this embodiment of the present invention, in particular in combination Figures 15 and 16. 返回到本讨论,提供光学结构的目的是获得使无论可能发生在何处的光导向体输出的不均匀性最小化的效果。 Back to the present discussion, an optical structure, whether the purpose of obtaining that the unevenness minimizing effect may occur where the output of the light guide body. 例如,图6和8所示的光导向体60可具有主要在输入表面62附近的不均匀性,这将建议增加在输入表面62附近具有更大光功率的光学结构。 For example, as shown in FIGS. 6 and 8, the light guide may have a main body 60 in the vicinity of the surface unevenness of an input 62, which will be proposed to increase the optical power of the optical structure having a larger near the input surface 62.

请特别结合图7,光学结构68可形成在光学薄膜70的一表面72上。 Please particular reference to FIG. 7, the optical structures 68 may be formed on a surface of the optical film of 7270. 然后,使用紫外线(UV)固化、压敏或其它适当的胶粘剂将光学薄膜70连接到光导向体60的楔形结构。 Then, an ultraviolet (UV) curing, pressure sensitive or other suitable adhesive to the optical film 70 is connected to the wedge structure of the light guide body 60. 或者,可将楔块成块模制,以在背面66中包括光学结构68。 Alternatively, the wedge may be molded into blocks, to include the optical structures 66 in the back 68.

如同从先前讨论中总的较清楚的那样,事实上光学结构的任何结构可以形成在一光学薄膜中,并且通过诸如粘合将光学薄膜连接到光导向体或其它成块光学元件。 As apparent from the more discussed previously in general, virtually any configuration of optical structures may be formed in an optical film, and the light guide is connected to the optical film or other optical elements into blocks, such as by an adhesive. 例如,事实上可将减少眩光、防浸湿、菲涅耳(Fresnel)和任何其它能形成在光学薄膜表面中的结构方便地复制在薄膜中,然后将薄膜连接到另一个光学元件。 For example, in fact, can be reduced glare, anti-wet, Fresnel (the Fresnel) and any other structure can be formed on the optical film surface easily replicated in the film, then the film is connected to another optical element.

使用微复制过程可以制造结合有设计的光学结构的薄膜。 Using a micro-replication process structure incorporating thin film optical design can be manufactured. 在该制造过程中,例如通过将图案切削进入一金属辊以制作靠模(master),并且通过挤压、铸造和固化、压凸和其它适当过程用靠模制造薄膜。 In this manufacturing process, for example by cutting the pattern into the metal roll to produce a cam (Master), and by extrusion, casting and curing, embossing and other suitable processes for producing a film with a cam. 或者,可以通过加压或注塑模制、铸造或辊轧成形来制造薄膜。 Alternatively, by pressing or injection molding, casting, or roll forming for manufacturing a thin film. 在题为“具有减少缺陷表面的光学薄膜和制造该薄膜的方法”、编号为No.09/246,970、提交于1999年2月9日的普通转让美国专利申请(代理人摘要号No.54176USA9A)中叙述了一种较佳的装置和用于微复制的方法,本文将援引其揭示内容作为参考。 Assigned U.S. Patent Application (Attorney Docket No. No.54176USA9A) In general, entitled "Optical films with reduced surface defects and a method of manufacturing the same," No. No.09 / 246,970, filed December 9, 1999 It is described a preferred apparatus and method for microreplication, to invoke its disclosure herein by reference.

作为本发明的上述特征的一个示例,并结合图9,一线性菲涅耳透镜或棱镜80具有一大致呈平面的第一表面82和一第二表面84。 As one example of the above features of the present invention, in conjunction with FIG. 9, a linear Fresnel lens or prism 80 having a substantially planar first surface 82 and a second surface 84. 第二表面84形成有透镜结构86,并且将附加的光学结构88叠加在透镜结构86上。 The second surface 84 is formed with a lens structure 86, and the additional optical structure 88 is superimposed on the lens structures 86. 光学结构88具有若干特性,例如波幅、周期和纵横比,它们从透镜80的一第一边缘90变化到透镜80的一第二边缘92。 The optical structure 88 has several characteristics, e.g. amplitude, period, and the aspect ratio of which a second edge 92 changes from a first edge 90 of the lens 80 to the lens 80. 透镜80可以成块构成,或者如图9所示,包括光学结构88的透镜结构86可以形成在一薄膜94上,然后将该薄膜粘合到成块的光学基片96。 Lens 80 may be constituted into blocks, or 9, comprising an optical structure 88 of the lens structure 86 may be formed on a film 94, the film is then bonded to the optical block 96 into the substrate. 根据应用,可以将第一表面82设置成一输入表面,而将第二表面84设置成一输出表面,反之亦然。 Depending on the application, the first surface 82 may be disposed at an input surface and a second surface disposed at an output surface 84, and vice versa.

图10和11示出了一圆形透镜81,该圆形透镜包括一第一表面83和一第二表面85。 10 and 11 illustrate a circular lens 81, the circular lens 83 comprising a first surface and a second surface 85. 形成包括透镜结构87的第二表面85,例如圆形菲涅耳透镜结构,并将附加的光学结构89叠加在透镜结构87上方。 Forming a second surface 85 comprises a lens structure 87, such as a circular Fresnel lens structure, and an additional optical structure 89 superimposed on the lens structures 87. 光学结构89具有若干特性,例如波幅、周期和纵横比,例如,它们可以从透镜81的一外圆周变化到透镜81的中心。 The optical structure 89 has several features, such as amplitude, period, and the aspect ratio, for example, they can vary from an outer circumference of the lens 81 to the center of the lens 81.

现在请参见图12,该图示出了一薄膜100,该薄膜包括一使用“V”形切削工具形成的光学结构108的波幅变化的图案102。 Referring now to Figure 12, which shows a film 100, the film comprises a change in amplitude using the optical structure "V" shape formed by the cutting tool 108 of the pattern 102. 图案102可形成在薄膜100的顶面和/或底面上。 Pattern 102 may be formed on the top and / or bottom surface of the film 100. 同样,图案102可形成在一楔块或平板中。 Similarly, the pattern 102 may be formed in a wedge or plates. 薄膜100具有一第一边缘104和一第二边缘106。 A thin film 100 having a first edge 104 and second edge 106. 设置在图案102中的光学结构108从第一边缘朝第二边缘106延伸。 The optical structure 102 is disposed in a pattern 108 extending from the first edge 106 towards the second edge. 每个光学结构108可具有许多特性,例如波幅、周期和纵横比。 Each optical structure 108 may have a number of characteristics, such as amplitude, period, and the aspect ratio. 图案102还可具有若干特性,例如限定光学结构108之间间隔的间距p。 Pattern 102 may also have several properties, such as the interval defining the pitch p between the optical structure 108. 图12所示的光学结构108具有波幅变化。 The optical configuration shown in FIG. 12 108 has amplitude variations. 在薄膜100的应用中,可将诸槽设置成使其波幅的变化与结合薄膜100的光导向体的光源垂直、平行或成一角度。 In the application of the film 100, the slots may be arranged so that the vertical amplitude variation with the light source in conjunction with a film guide member 100, parallel or at an angle.

继续参见图12,显然在图案102中,光学结构108在第一边缘104处形成更大的波幅,波幅朝第二边缘106减少。 Continuing to refer to FIG. 12, it is clear in the pattern 102, the optical structure 108 is formed larger amplitude at the first edge 104, edge 106 toward the second amplitude reduction. 由于表面斜度越高,更大的波幅沿槽轴线产生越大的光功率。 Since the higher the slope of the surface, the greater the amplitude the greater along the groove axis to generate optical power. 那么,该图案的光功率随离开第一边缘104的距离的一函数而减少。 Then, the optical power of the pattern with a function of the distance away from the first edge 104 is reduced. 这种光学结构108和图案102的设置是有目的的。 Providing such optical structures 108 and pattern 102 is purposeful.

参阅图13和14,它们分别示出了薄膜110和112。 Referring to FIGS. 13 and 14, which respectively show films 110 and 112. 每一薄膜110和112具有与薄膜100相同的特性,并且使用相同的标号来叙述它们之间的相同部分。 Each film 110 and 112 have the same characteristics as film 100, and the same reference numerals to describe the same portion therebetween. 与使用一“V”形工具形成图案相反,图13的薄膜110具有使用具有一曲线或弧形结构的工具形成的光学结构116的一图案114。 And patterned using a "V" shaped tool contrast, the thin film 110 of FIG. 13 having an optical structure having a curved or arcuate configuration of the tool is formed a pattern 114 116. 图14的薄膜112具有一使用平端工具形成的光学结构120的图案118。 FIG film 112 having an optical structure 14 using a blunt end pattern 118 formed on the tool 120. 图案114和118被设置成所述情况,以便在薄膜110和112的表面或诸表面中提供光功率。 Pattern 114 and the case 118 are arranged so as to provide optical power in the surface or the film 110 and the surface 112 of such. 应予理解的是,任何工具结构事实上可以与被选择的特定工具一起使用,以便在薄膜的表面或诸表面中获得期望数量和形式的光功率。 It should be appreciated that, in fact any tool configuration may be used with the particular tool being selected to achieve the desired amount and form of optical power in the surface or the surface of the film in all.

在图15和16所示的光导向体121中,光学结构124的一第一图案122形成在底面126中,而光学结构130的一第二图案128形成在楔块134的顶面132中。 In FIG. 15 the light guide member 16 and 121 shown, a first pattern 124 of optical structures 122 is formed in the bottom surface 126, and a second pattern 130 of optical structures 128 is formed in the top surface 134 of the wedge 132. 只是出于图示的目的,图15所示的光学结构124仅部分延伸横过底面126,而图15所示的光学结构130仅部分延伸横过顶面132。 For purposes of illustration only, the optical structure 124 shown in FIG. 15 only partially extends across the bottom surface 126, and the optical structure 130 shown in FIG. 15 only partially extends across the top surface 132. 应予理解的是,光学结构124和光学结构130将在大多数情况下分别延伸横过整个底面126和顶面132。 It should be appreciated that the optical structure 124 and the optical structure 130 extending across the entire bottom surface 126 and top surface 132 in most cases. 第一图案122可以被设置成有利于引出来自楔块134的光线,而第二图案128可以被设置成遮盖来自楔块的光线输出中的不均匀性。 The first pattern 122 may be provided to facilitate the extraction of light from the wedge 134, while the second pattern 128 may be arranged to cover the non-uniformity of light output from the wedge. 然而,应予理解的是,楔块134中实现的图案将取决于将要从楔块134获得的理想光线输出。 However, it should be appreciated that the wedge 134 is implemented will depend on the pattern over the light output from the wedge 134 will be obtained. 此外,如上所述,图案122和128可以首先形成在光学薄膜中,然后将光学薄膜连接到楔块,例如通过粘合。 As described above, patterns 122 and 128 may be formed in the first optical film, the optical film is then connected to the wedge, such as by an adhesive. 在另一构造中,通过注塑模制或铸造使表面122和128形成在楔块中。 In another construction, by injection molding or casting and the surface 122 of the wedge 128 is formed.

如同从先前讨论中清楚的那样,并且根据本发明的较佳实施例,一光导向体可形成有光学结构,例如一第一表面、一第二表面或两者中的诸“V”形槽。 As apparent from the previous discussion above, and in accordance with the preferred embodiment of the present invention, a light guide body may be formed with optical structures, such as a first surface, a second surface or both of such a "V" groove . 无论第一表面或第二表面是输入表面,都与该表面相对于光源的取向有关。 Whether first or second surface is the input surface, are oriented with respect to the surface of the relevant light source. 光学结构可被均匀或随机隔开,并且可具有多种其它特性。 The optical structure may be uniformly or randomly spaced, and may have a variety of other characteristics. 因而,本发明具有用于多种应用的光导向体和背照灯系统的应用。 Accordingly, the present invention has applications for a variety of applications of the light guide member and the backlight system. 应用的一个示例是通过使全内反射无效以引出光线的背照灯系统,其中光导向体在其背面和/或输出表面中形成有光学结构。 An example application is the backlight system by total internal reflection of light to elicit invalid, wherein the light guide body is formed with an optical structure on its rear side and / or the output surface. 另一个示例是具有一光导向体的背照灯系统,该光导向体使用点图案以引出光学,并且包括形成在其背面和输出表面的任何一个或两个中的光学结构。 Another example is a system having a backlight light guide body, the light guide member used to elicit the optical dot pattern, and in any form including one or two optical structures in its back surface and an output. 下面将更详细地叙述这些和其它示例。 These and other described below in more detail with examples.

请参见图17,该图示出了一背照灯140,该背照灯包括位于楔形光导向体144的输入边缘143附近的一光源142。 See Figure 17, which shows a backlight 140, a backlight which includes a wedge-shaped light guide member 144 near the input 143 of a light source 142 edge. 一背反射体146设置在光导向体144的背面154附近,一转向薄膜148设置在光导向体144的输出表面150附近。 A back reflector disposed on the light guide member 146 near the rear face of 154,144, a turning film 148 disposed near the light output surface 144 of the guide 150. 背面154形成有光学结构152。 Back surface 154 of the optical structure 152 is formed. 光学结构152可以是形成在背面154中的诸槽,如图16所示的那样。 The optical structure 152 may be formed on the back surface of the slots 154, as shown in Figure 16. 图17所示的诸槽是“V”形槽,并且具有约90度的棱镜角,但可以使用从60度变化到120度的棱镜角。 The slots shown in Figure 17 is "V" shaped groove, and has a prism angle of about 90 degrees, but can vary from 60 degrees to 120 degrees prism angle. 除“V”形槽以外的形状也可以用于光学结构152。 A shape other than "V" shaped grooves of the optical structure 152 may also be used. 此外,可使每个光学结构形成具有一沿其长度从标称值开始变化的高度。 Further, each optical structure is formed can have its height varied from a nominal length value along a. 该变化可具有一波长,该波长可处在约1微米至1000微米的范围内,最好小于约140微米。 This change may have a wavelength, this wavelength may be in from about 1 micron to 1000 microns, preferably less than about 140 microns. 在题为“光学薄膜”、编号为09/025,183、提交于1998年2月18日的普通转让美国专利申请(代理人摘要号No.53772USA6A)中揭示并叙述了这种结构,本文将援引其揭示内容作为参考。 Entitled "Optical Film", No. 09 / 025,183, commonly assigned, filed February 18, 1998 U.S. Patent Application (Attorney Docket No. No.53772USA6A) discloses such a configuration and described herein will invoke its disclosure by reference.

如图所示,光学结构152的取向基本上与光源142垂直。 As shown, the optical alignment structure 152 is substantially perpendicular to the light source 142. 应予理解的是,光学结构152的取向可以与光源142平行,或与光源142成0度与90度之间的一角度。 It should be appreciated that the orientation of the optical structure 152 may be a collimated light source 142 and the light source 142 or an angle between 0 degrees and 90 degrees.

转向薄膜148可以是任何适当的棱镜转向薄膜。 Turning film 148 may be any suitable prismatic turning film. 例如,可将转向薄膜148形成如同先前所述的题为“具有可变角棱镜的光学薄膜”的美国专利申请中叙述的那样。 For example, the turning film 148 is formed so as previously described, entitled "variable-angle prism having an optical film," U.S. Patent Application.

形成包括光学结构152的背面154。 Forming the back surface 154 includes an optical structure 152. 这将导致与引出自背面154的光线相比,通过输出表面150从光导向体144引出一些另外的光线。 This would result in comparison with the lead from the back light 154, light extraction from some additional light guide body 144 through the output surface 150. 一部分离开背面154的光线将遇到背反射体146,并且反射回来通过光导向体144和输出表面150。 A portion of the back surface 154 of the light leaving the reflector will encounter the back 146, and is reflected back through the light guide body 144 and the output surface 150.

现在请参见图18,该图示出了一背照灯140',该背照灯的结构与背照灯140相似,并使用相同的标号来表示相同的部分。 Referring now to Figure 18, which shows a backlight 140 ', 140 similar to the backlight and the backlight structure, and the same reference numerals denote the same parts. 带撇号的标号用于表示与图17所示的背照灯构造不同的部分。 Primed reference numerals are used to designate the configuration of the backlight 17 shown in FIG different portions. 背照灯140'包括位于楔形光导向体144'的输入边缘143附近的一光源142。 Backlight 140 'includes a wedge-shaped light guide body 144' close to a light input edge 143,142. 一背反射体146'设置在光导向体144'的背面154'附近,一转向薄膜148设置在光导向体144'的输出表面150'附近。 A back reflector 146 'is provided on the light guide body 144' of the back surface 154 'near, a turning film 148 disposed on the light guide body 144' adjacent the output surface 150 '. 输出表面150'形成有光学结构152'。 The output surface 150 'is formed with an optical structure 152'. 光学结构152'可以是形成在输出表面150'中的诸槽,如图17所示的那样。 The optical structure 152 'may be formed on the output surface 150' of the slots, as shown in Figure 17. 图18所示的诸槽是“V”形槽,并且具有约90度的棱镜角,但可以使用从60度变化到120度的棱镜角。 The slots shown in FIG. 18 is "V" shaped groove, and has a prism angle of about 90 degrees, but can vary from 60 degrees to 120 degrees prism angle. 除“V”形槽以外的其它形状也可以用于光学结构152'。 Shapes other than the "V" shaped grooves can also be used optical structure 152 '. 此外,可使每个光学结构152'形成具有一沿其长度从标称值开始变化的高度。 Further, each of the optical structures can 152 'has a height which is formed from a length of a nominal value starts to change direction. 该变化可具有一波长,该波长可处在约1微米至1000微米的范围内,但对于光导向体应用最好小于约140微米。 This change may have a wavelength, this wavelength may be in from about 1 micron to 1000 microns, but the application of the light guide body preferably less than about 140 microns. 在先前所述的题为“光学薄膜”、编号为09/025,183的美国专利申请中揭示并叙述了这种结构。 Such a structure is disclosed and described in U.S. Patent Application previously entitled "Optical Film", No. 09 / 025,183 in.

如图所示,光学结构152'的取向基本上与光源142'垂直。 As shown, 'substantially aligned with the light source 142' of the optical structure 152 vertically. 应予理解的是,光学结构152'的取向可以与光源142'平行,或与光源142成0度与90度之间的一角度。 It should be appreciated that the 'orientation of the light source 142 may be' parallel to the optical structure 152, or an angle between the light source 142 to 0 and 90 degrees with.

形成包括光学结构152'的输出表面150',这将导致与输出表面150'相比,通过背面154'从光导向体144引出另外的光线。 'Is formed of the output surface 150' includes an optical structure 152, which causes the 'comparison, the back surface 154' and the output lead-out surface 150 of the additional light from the light guide body 144. 也从输出表面150'引出一些光线。 Also from the output surface 150 'lead-out some of the light. 一部分离开背面154'的光线将遇到背反射体146',并且将反射回来通过光导向体144'和输出表面150。 Leaving a portion of the back surface 154 'will experience a back light reflector 146', and the light reflected by the guide 144 'and the output surface 150 thereof. 因此,对于背照灯140',最好将背反射体146'直接固定于背面154'。 Thus, for the backlight 140 ', preferably the back reflector 146' is directly secured to the back surface 154 '. 这可以通过将背反射体146'层叠到背面154'得以实现。 This may be a back reflector 146 'is laminated to the back surface 154' is achieved by. 在编号为09/414,124、提交于1999年10月8日、题为“具有一直接固定的反射体的光导向体及该光导向体的制造方法”的普通转让美国专利中揭示并叙述了这种用于背反射体146'的设置,本文将援引其揭示内容作为参考。 In No. 09 / 414,124, filed on October 8, 1999, entitled ordinary "having a light guide body is directly fixed reflector and a method of manufacturing the light guide member" of the transfer and described in U.S. Patent discloses this species for the back reflector 146 'is provided, the reference to its disclosure herein by reference. 或者,可以使用蒸汽沉积过程将背反射体形成在背面上。 Alternatively, a vapor deposition process, the back reflector is formed on the back surface. 在反射体直接固定于光导向体背面的实施例中,应予理解的是,反射体必须是镜面、高效且具有低吸收率的。 In an embodiment the reflector is directly fixed to the back surface of the light guide body, to be understood that the mirror reflector must be efficient and have a low absorption rate.

如上所述,增加分别形成在光导向体的背面或输出表面中的光学结构152和152'的特性变化,例如光学结构的波幅变化,以分别减少背照灯140和140'的输出中的不均匀性。 As described above, increased formation of 'characteristic change, for example, the amplitude variation of the optical structure to respectively reduce the backlight 140 and 140' or the output surface of the optical structure on the back surface of the light guide body 152 and 152 respectively output is not uniformity. 可以通过其它方法在光学结构中提供类似变化,例如向光学结构喷珠(bead blasting),然而,形成具有棱镜高度的所述变化的诸槽提供了一种可控制、可预知的减少背照灯输出中的不均匀性的较佳方法。 Similar variations may be provided in the optical structure by other means, for example, bead blasting to the optical structure (bead blasting), however, the slots are formed having a prism height of said variation provides a controllable and predictable reduced backlight preferred method of unevenness in the output.

图19示出了设置在背照灯140的输出上方的观察锥体中的光学输出,即从转向薄膜148的输出表面离开背照灯140的光线。 FIG. 19 shows an optical output is provided above the observation cone backlight output 140, i.e., away from the backlight 140 from the lamp light output surface of turning film 148. 可由图示的光线输出确定的是同轴亮度、最大亮度、累积强度、水平分布或水平半角和垂直分布或垂直半角。 Illustrated by the light output determined that the on-axis brightness, maximum luminance, the integrated intensity, distribution or horizontal and vertical distribution of the horizontal or vertical half-width half-width. 图20为背照灯140'提供了相似的分布。 20 140 'provides a similar distribution of the backlight. 显而易见的是背照灯140'的输出具有减少的水平分布和略微增加的垂直分布。 Be apparent that the backlight 140 'having a reduced output level distribution and the vertical distribution of slightly increased. 尽管背照灯140'的同轴亮度和最大亮度与背照灯140相比基本增加,但来自背照灯140和140'的总累积强度或输出光线的总量基本相同。 Although backlight 140 'coaxially with the luminance and the maximum luminance of the backlight 140 increases substantially in comparison, but from the backlight 140 and 140' are substantially the same total amount or the total integrated intensity of the output light. 从图19和20可以理解的是,光导向体140和140'中的光学结构的设置将分别对背照灯系统的输出产生影响。 From FIGS. 19 and 20 can be appreciated that an optical structure 'of a light guide 140 and 140 respectively have an impact on the output of the backlight system. 在背照灯140'中,具有形成在其顶面中的光学结构152'的光导向体144'与背照灯140相比可实现背照灯140'的光学输出的附加平行校准。 In the backlight 140 'having an optical structure formed on a top surface 152' of the light guide body 144 'and the backlight 140 may be implemented as compared to the backlight 140' additional collimated optical output. 此外,由于光学结构152'可以形成有变化的特性,如上所述,在没有另外的光学薄膜或其它装置(例如漫射体)的情况下,可使来自背照灯140'的光学输出均匀。 Further, since the optical structure 152 'may be formed with varying characteristics, as described above, in the absence of additional optical films or other means (e.g., a diffuser), the can from the backlight 140' of the optical output uniform.

还有一些与在光导向体140'的输出表面150'中提供光学结构152'(包括变化的特性)相关的附加优点。 Some 'output surface 150' of the light guide 140 providing an optical structure 152 (including a change in the characteristics) of the additional advantages associated apos. 这样的一个优点涉及输出表面150'与转向薄膜148的分界面。 One advantage relates to the output surface 150 'and the turning film 148 in the interface. 对于形成在输出表面150'中的光学结构152',转向薄膜148和输出表面150'的棱镜之间具有相对较少的接触点。 For forming the output surface 150 'of the optical structure 152', the turning film 148 and the output surface having a relatively small contact points between the prism 150 '. 这会导致通常被称为浸湿的光学缺陷减少。 This leads to a reduction of optical defects commonly referred to as wet. 如上所述,改变光学结构152'的形式还有助于遮盖背照灯的输出中的缺陷,使光线输出更加均匀。 As described above, changing the optical structure 152 'also helps to hide defects in the output of the backlight, so a more uniform light output. 因此,在输出表面150'中提供光学结构152'的另一优点可以消除整个背照灯系统中的漫射体薄膜。 Thus, 'providing an optical structure 152' at the output surface 150 of the diffuser can be eliminated A further advantage of the entire film in the backlight system. 如同可以从图20观察到的那样,由于光学结构152'提供了光平行校准,因此本发明可提供与典型的背照灯系统相比需要较少光学薄膜片材的背照灯系统。 As can be seen from FIGS. 20 to above, since the optical structure 152 'provides collimated light, thus the present invention can provide the backlight requires less film sheet optical system as compared with a typical backlight system.

图21示出了一光导向体151、一转向薄膜153、一LCD显示器154和一背反射体155。 FIG 21 shows a light guide body 151, a turning film 153, a LCD display 154 and a back reflector 155. 从光导向体151的顶面161和背面157引出光线。 From the top surface 161 and rear surface 157 of the light guide body 151 extracts light. 背反射体155和背面157之间的强菲涅耳反射156可截留相当一部分从背面157引出的光线。 157 between the back reflector and the back surface 155 of the strong Fresnel reflection light 156 may be entrapped drawn considerable portion 157 from the rear surface. 该光线最终会散失,从而导致效率低下。 The light eventually lost, resulting in poor efficiency. 为了改善这种情况,如图22所示,背反射体155'的反射面158可形成有光学结构。 To improve this situation, as shown in Figure 22, the back reflector 155 'of the reflective surface 158 may be formed with optical structures. 光学结构可以是平面、槽或其它具有形状的结构。 The optical structures may be planar, the groove having a shape or configuration other. 光学结构有助于减少来自背反射体155'的镜面反射成分,并且引导更多的光线向上通过光导向体151,从而增加其效率。 The optical component structure helps to reduce specular reflection from back reflector 155 ', and the guide more light upwardly through the light guide body 151, thereby increasing its efficiency. 一适当的、包括光学结构的背反射体是由3M公司出售的增强型漫反射体(EDR)薄膜产品。 A suitable, include a back reflector structure is an enhanced optical diffusion reflector (EDR) sold by 3M Company film product. 本技术领域的技术人员将清楚的是,图22中讲述的原理事实上可应用于任何背照灯,包括但不限于背照灯140和本文叙述的附加的较佳实施例的背照灯系统。 Those skilled in the art will appreciate that, in FIG. 22 about the fact that the principles may be applied to any backlight, including but not limited to a backlight 140, and additional preferred embodiments described herein, embodiments of backlight systems .

上面已经叙述了背照灯系统的一些修改、增强和改进。 Some modifications have been described above, the backlight system, enhancements and improvements. 在本发明的范围内还可理解其它变化。 Within the scope of the present invention may be understood that other variations. 应予理解的是,背照灯系统的特定设置将取决于其应用。 It should be appreciated that the particular set backlight system will depend on the application. 为了图示本发明的适应性,结合图23-28示出并叙述几个示例。 In order to illustrate the adaptability of the present invention, in conjunction with FIGS. 23-28 shown and described several examples.

光导向体的背面中的诸槽在图23中,背照灯160包括一光源162、一楔形光导向体164、一背反射体166、一转向薄膜168和一任选的附加光学薄膜170。 A light guide member in the slots of the back surface in FIG. 23, a backlight 160 includes a light source 162, a wedge-shaped light guide body 164, a back reflector 166, a turning film 168 and an optional additional optical films 170. 光导向体164具有一输出表面165和一背面172,该背面形成有与结合图16中的光导向体134所示的光学结构124或130相似的光学结构。 A light guide 164 having an output surface 165 and a back surface 172, 124 formed in the back surface 130 or similar optical structure of the optical structure 134 shown in FIG. 16 in connection with the light guide body. 通过注塑模制或铸造可将光学结构直接形成在光导向体164中。 The optical structure may be directly formed on the light guide body 164 by injection molding or casting. 或者,可将光学结构形成在一层叠到光导向体164的背面172的光透射薄膜中。 Alternatively, the optical structure may be formed on a light transmitting film laminated to the back surface 164 of the light guide body 172.

使用形成在光导向体164的背面172上的光学结构,通过输出表面165离开光导向体164的光线与背面172相比有所增加。 Using structures formed on the back surface 172 of the optical light guide body 164, exits the light guide through the output surface 165 thereof increased in comparison with the back surface 172 of light 164. 然而,离开背面172的光线遇到背反射体166,并且反射回来通过光导向体164。 However, the back surface 172 of the light leaving the reflector back face 166, and is reflected back through the light guide body 164. 一包括光学结构的适当反射体是一带槽的漫反射体。 A reflector comprising a suitable optical structure is a diffuse reflector fluted.

根据背照灯160的附加方面,可形成在其输出表面176中包括一漫射结构的转向薄膜168。 According to an additional aspect of the backlight 160 can be formed include a surface 176 at its output 168 a turning film diffusing structures. 可任选的光学薄膜170可以是亮度增强薄膜,例如上面提到的BEFIII光学薄膜、漫反射偏光镜薄膜产品(作为DRPF出售)或镜面反射偏光镜薄膜产品(作为DBEF出售),这些产品都可以从3M公司购得。 Optionally an optical film 170 may be a brightness enhancement film, for example, the above-mentioned optical film BEFIII diffuse reflection polarizer film product (sold as DRPF) or specularly reflective polarizer film product (sold as DBEF), these products are available from 3M company.

光导向体的输出表面中的诸槽在图24中,背照灯包括一光源182、一楔形光导向体184、一背反射体186、一转向薄膜188和一任选的光学薄膜190。 The slots guide the light output surface of the body in FIG. 24, a backlight 182 includes a light source, a wedge-shaped light guide body 184, a back reflector 186, a turning film 188 and an optional optical film 190. 光导向体184具有一输出表面192,该输出表面形成有与结合图17所示的光导向体144所示的光学结构152相似的光学结构。 A light guide body 184 having an output surface 192, 152 formed in the output surface of the optical structure similar to the optical configuration shown in 144 of the light guide member shown in FIG. 17 binding. 通过注塑模制或铸造可形成光导向体184,以将光学结构包括在输出表面192中。 By injection molding or casting a light guide body 184 may be formed to the surface of the optical structure 192 included in the output. 或者,可将光学结构形成在一层叠到光导向体184的输出表面192的光透射薄膜中。 Alternatively, the optical structure may be formed in a laminated light guide to the output surface of the light transmissive member 184 of the film 192. 这种设置可以增加制造灵活性,并且通过简化用于光导向体184的模具设计以降低制造成本。 Such an arrangement may increase manufacturing flexibility, and the mold body 184 is designed for the light guide to reduce manufacturing costs by simplifying. 取代为每个光导向体制作唯一的模具的是,通过将光导向体的一表面与形成有光学结构的光学薄膜一起层叠以使光导向体适合于本发明。 The only substitution made molds for each of the light guide body is formed by a surface of the light guide body is laminated with an optical film to the optical configuration of the light guide member suitable for the present invention.

使用形成在光导向体184的输出表面192上的光学结构,从输出表面192离开光导向体184的光线数量与从背面193离开光导向体的光线数量相比有所增加。 Use is formed on the output surface of the optical structure 192 of the light guide body 184, the light guide away from the output surface 192 of the body 184 increase the amount of light in comparison with the amount of light exiting the light guide member 193 from the rear surface. 然而,离开背面193的光线遇到背反射体186,并且反射回来通过光导向体184。 However, the back surface 193 of the light leaving the reflector back face 186, and is reflected back through the light guide body 184. 为了确保离开背面193的光线反射回来通过光导向体184的百分比较高,最好将背反射体186直接固定于背面193。 In order to ensure that light leaving the back surface 193 of the light guide member is reflected by a higher percentage of 184, the back reflector 186 is preferably fixed directly to the rear surface 193. 这可通过将一镜面或镜面薄膜层叠到背面193或通过蒸汽沉积涂覆背面193得以实现。 This may be 193 or back surface 193 is achieved by laminating the vapor deposition coated by a film to the backside of the mirror or mirror. 在直接固定于背面193时,背反射体必须是镜面和高效的。 When 193 is directly fixed to the back surface, the back reflector and the mirror must be efficient.

根据背照灯的附加方面,可形成在其输出表面196中包括一漫射结构的转向薄膜188。 According to an additional aspect of the backlight, may be formed on the output surface 196 includes a steering structure of a diffusing film 188. 可任选的光学薄膜190可以是亮度增强薄膜,例如上面提到的BEFIII光学薄膜、漫反射偏光镜薄膜产品(作为DRPF出售)或镜面反射偏光镜薄膜产品(作为DBEF出售),这些产品都可以从3M公司购得。 Optionally an optical film 190 may be a brightness enhancement film, for example, the above-mentioned optical film BEFIII diffuse reflection polarizer film product (sold as DRPF) or specularly reflective polarizer film product (sold as DBEF), these products are available from 3M company.

在图25中,背照灯220包括一光源222、一楔形光导向体224、一背反射体226和一转向薄膜228。 In Figure 25, a backlight 220 includes a light source 222, a wedge-shaped light guide body 224, 226 a back reflector 228 and a turning film. 光导向体224具有一形成有光学结构(图中未示出)的输出表面230。 A light guide body 224 is formed with an optical structure (not shown) of the output surface 230. 光学结构可具有一使用任何适当形状的切削工具形成的变化图案,例如在先前提到的题为“光学薄膜”的美国专利申请中叙述的图案。 The optical structure may have a varying pattern of any suitable shape using a cutting tool formed, for example, described in U.S. Patent Application, entitled "optical film" in the previously mentioned pattern. 通过注塑模制或铸造可以在光导向体224中直接形成光学结构,或者,可将光学结构形成在一层叠到光导向体224的输出表面230的光透射薄膜中。 Can body by injection molding or casting in the light guide 224 form the optical structures directly, or, the optical structure may be formed in a laminated body of the light guide output surface 224 of light transmittance of the film 230.

使用形成在光导向体224的输出表面230上的光学结构,通过背面232离开光导向体224的光线数量与通过输出表面230离开的光线数量相比有所增加。 Use is formed on the output surface of the optical structure 230 of the light guide body 224, exits the light guide 232 through the back surface 224 of light quantity compared to the amount of light exiting through the output surface 230 has increased. 该光线遇到背反射体226,并且反射回来通过光导向体224。 The light encounters a back reflector 226, and reflect back through the light guide body 224. 一适当的反射体可以是一带槽的漫反射体。 A suitable reflector may be a diffuse reflector fluted. 光学结构还可以遮盖不均匀性,并因而在背照灯系统中消除了漫射体的需要。 The optical structure may also cover the unevenness, and thereby eliminating the need for a diffuser in the backlight system.

同样,由于光学结构还可平行校准离开光导向体的光线(见图20),因此本发明可以提供与典型的背照灯系统相比所需光学薄膜片材较少的背照灯系统。 Also, since the optical structure may also be collimated light leaving the light guide body (see FIG. 20), thus the present invention can provide a thin backlight system, an optical sheet required less material than a typical backlight system. 在图25所示的实施例中,具有单张可任选的光学薄膜238,该薄膜可以是从3M公司购得的漫反射偏光镜薄膜产品(作为DRPF出售)或镜面反射偏光镜薄膜产品(作为DBEF出售)。 In the embodiment illustrated in FIG. 25, optionally having a single optical film 238, the film may be commercially available from 3M Company diffusely reflective polarizer film product (sold as DRPF) or specularly reflective polarizer film products ( as DBEF sale).

再循环背照灯系统在图26中,背照灯200包括一光源202、一楔形光导向体204、一背反射体206以及一张或多张附加、任选的光学薄膜210和212。 Recirculating backlight system in FIG. 26, a backlight 200 includes a light source 202, a wedge-shaped light guide body 204, a back reflector 206, and one or more additional sheets, the optional optical films 210 and 212. 光导向体204具有一背面214,该背面形成有与结合图17中的光导向体144所示的光学结构152相似的光学结构。 A light guide body 204 has a rear surface 214, 152 formed in the back surface of the optical structure similar to the optical configuration of the light guide 144 shown in FIG. 17 combination. 通过注塑模制或铸造可以在光导向体204中直接形成光学结构。 The optical structure may be formed on the light guide body 204 directly by injection molding or casting. 或者,可将光学结构形成在一层叠到光导向体204的背面214的光透射薄膜中。 Alternatively, the optical structure may be formed on a light transmitting film laminated to the back surface 214 of the light guide body 204.

形成在光导向体204的背面214上的光学结构有利于从光导向体204引出光线。 The optical structure is formed on the back surface 214 of light guide 204 to facilitate extraction of light from the light guide body 204. 因此,光学结构可以消除通常用于从光导向体引出光线的漫射点图案。 Thus, the optical structure may eliminate the dot patterns are typically used for diffusion extracts light from the light guide body. 一些光线离开背面214,该光线遇到背反射体206,并且反射回来通过光导向体204。 Some of the light leaving the back surface 214, the light encounters a back reflector 206, and reflect back through the light guide body 204. 一种适当的背反射体是3M公司出售的增强型漫反射体(EDR)薄膜产品。 A suitable back reflector material is sold by 3M Company enhanced diffusion reflector (EDR) film products.

消除用于引出来自光导向体204的光线的点图案会降低增加漫射以遮盖出现在背照灯200的输出中的点图案的需要。 Elimination of a dot pattern for extracting the light from the light guide body 204 may be reduced to cover the need to increase the diffusion appears at the output of the backlight 200 in the dot pattern. 可任选的光学薄膜210和220可以是亮度增强薄膜,例如上面提到的设置在交叉设置中的BEFIII光学薄膜;漫反射偏光镜薄膜产品(作为DRPF出售)、镜面反射偏光镜薄膜产品(作为DBEF出售)和/或其多种组合,这些产品都可以从3M公司购得。 Optional optical films 210 and 220 may be a brightness enhancement film, for example, the above-mentioned optical film is provided in the intersection BEFIII settings; diffusely reflective polarizer film product (sold as DRPF), a mirror reflective polarizer film products (as sale DBEF), and / or various combinations of these products are commercially available from 3M company.

在图27中,背照灯240包括一光源242、一楔形光导向体244、一背反射体246、一漫射体248和第一、第二可任选的附加光学薄膜250和252。 In Figure 27, a backlight 240 includes a light source 242, a wedge-shaped light guide body 244, a back reflector 246, a diffuser 248 and first and second optical films can be optional additional 250 and 252. 最好使用一具有点图案的胶粘剂将背反射体246固定于光导向体244的背面254,例如在先前提到的题为“具有一直接固定的反射体的光导向体”的美国专利申请中叙述的胶粘剂。 U.S. Patent Application adhesive is preferably used with a dot pattern, the back reflector 246 is fixed to the back surface of the light guide body 254 244, for example in the previously mentioned entitled "having a light guide body is directly fixed reflector" in He described adhesive. 因此,将胶粘剂以一点图案设置,通常是一引出点图案。 Thus, the adhesive pattern is provided with little, usually a dot pattern is drawn.

光导向体244具有一形成有光学结构(图中未示出)的输出表面255。 A light guide body 244 is formed with optical structures (not shown) of the output surface 255. 光学结构可具有一如上所述的变化图案。 The optical structure may have a varying pattern described above. 通过注塑模制或铸造可以在光导向体244中直接形成光学结构,或者,可将光学结构形成在一层叠到光导向体244的输出表面255的光透射薄膜中。 Can body by injection molding or casting in the light guide 244 is formed in the optical structures directly, or, the optical structure may be formed in a laminated light guide to the output surface of the light transmissive member 244 of the film 255.

如同所述,包括变化图案的光学结构可消除漫射体(例如漫射体248)的需要,以遮盖背照灯240的输出中的点图案和其它不均匀性。 As stated, the optical structure comprises a change pattern may eliminate the need for diffuser (diffuser e.g. 248) to cover the backlight 240 outputs dot patterns and other unevenness. 因而,漫射体248是可任选的。 Accordingly, the diffuser 248 is optional. 在使用时,可任选的光学薄膜250和252可以是亮度增强薄膜,例如上面提到的设置在交叉设置中的BEFIII光学薄膜产品、漫反射偏光镜薄膜产品(作为DRPF出售)或镜面反射偏光镜薄膜产品(作为DBEF出售),这些产品都可以从3M公司购得。 In use, the optional optical films 250 and 252 may be a brightness enhancement film, for example, the above-mentioned optical film disposed BEFIII cross product settings, diffusely reflecting polarizer film product (sold as DRPF) or a specular reflection polarized mirror film product (sold as DBEF), these products are commercially available from 3M company.

拟楔形背照灯系统现在请参见图28,背照灯260包括一光源262和一拟楔形光导向体264。 Quasi wedge backlight system Referring now to FIG 28, a backlight 260 includes a light source 262 and the wedge-shaped light guide body 264 a quasi. 拟楔形光导向体264包括一第一表面266和一第二表面268。 Quasi wedge-shaped light guide body 264 includes a first surface 266 and a second surface 268. 第一表面可形成有光学结构270,例如结合图17叙述的光学结构152。 A first surface of the optical structure 270 may be formed, for example, in conjunction with an optical structure 152 of FIG. 17 described. 第二表面可形成带刻面的槽结构272,该结构被设置成与光源262平行。 The second surface 272 may be formed with grooves faceted structure, the structure is arranged in parallel with the light source 262. 带刻面的槽结构272有利于通过增强全内反射的失效从光导向体引出光线。 Faceted slot structure 272 facilitate light extraction from the light guide body by increasing the total internal reflection failure. 尽管图中未示出,背照灯260还包括一设置在第二表面268附近的背反射体。 Although not shown, the backlight 260 also includes a back reflector disposed adjacent to the second surface 268.

带刻面的槽结构272具有可变的角特征。 Faceted slot structure 272 has a variable angle feature. 每个单独刻面具有一刻面角。 Each individual facet surface having a minute angle. 当带刻面的槽结构272包括一可变的角特征时,各个刻面角随不同刻面变化。 When groove structure Faceted 272 includes a variable angle feature, the respective facet angles vary from facet. 带刻面的槽结构272的这种设置会使出现在背照灯260的输出中的不均匀性减少。 Faceted slot structure 272 that is provided to reduce the unevenness will appear in the backlight 260 in the output.

尽管光导向体264被图示成一平板结构,但当导向体264可以是楔形的。 Although the light guide member 264 is illustrated as a flat plate structure, but the guide body 264 may be wedge-shaped. 此外,可将带刻面的槽结构272直接形成在光导向体264中,例如通过模制或铸造,或者可将带刻面的槽结构形成在一层叠到平板或楔形光导向体的光学薄膜中。 Further, the slot structure with facets 272 formed directly on the light guide body 264, for example by molding or casting, or may be slot structure with facets formed in a laminated optical film flat plate or wedge-shaped light guide body in. 带刻面的槽结构还可使密度随离开光源262的距离的一函数而变化。 Faceted slot structure also allows the density with a function of the distance away from the light source 262 changes.

根据上面的说明,本技术领域的技术人员将清楚本发明的其它修改和可替代实施例。 According to the above description, those skilled in the art of the present invention will be apparent that other modifications and alternative embodiments. 只能将该说明书解释为示意性的,并且是出于向本技术领域的技术人员讲述实施本发明的最佳方式的目的。 The description can be interpreted as illustrative, and for purposes to those skilled in the art the best mode of the present invention describes embodiment. 在不背离本发明的精神的情况下,可以充分改变结构和方法的细节,并且保留落在所附的权利要求书的范围内的所有修改的专有使用权。 Without departing from the spirit of the invention, the details of construction and sufficiently alter the method, the appended claim and reserves the exclusive right to all modifications within the scope of the book.

Claims (8)

1.一种光导,包括:一第一表面;与第一表面相对的一第二表面;一输入边缘表面,所述输入边缘表面在第一表面和第二表面之间延伸;多个形成在第一表面中的棱镜槽,所述棱镜槽各自具有一槽轴线,并且每条槽轴线基本上与其它槽轴线平行,其中,槽轴线被排列成基本上垂直于输入边缘表面;并且多个棱镜槽中的每一个棱镜槽具有一影响棱镜槽的光学性能的特性,该特性是棱镜槽的波幅、纵横比和间距中的至少一种,并且该特性随着位置的函数沿从输入边缘表面延伸的槽轴线变化。 1. A light guide, comprising: a first surface; the first surface opposite a second surface; an input edge surface extending between the first and second surfaces of the edge input surface; formed in a plurality of grooves in the first surface of the prism, the prism grooves each having a groove axis and the groove axes substantially parallel to each other with the axis of the groove, wherein the grooves are arranged in an axis substantially perpendicular to the input edge surface; and a plurality of prisms each prism groove having a groove of prism grooves impact properties of the optical properties of the prism grooves of the amplitude characteristic is at least one of aspect ratio and spacing, and the direction extending from the input characteristics as a function of the position of the edge surface change the channel axes.
2.如权利要求1所述的光导,其特征在于,相邻棱镜槽的特性变化是同相和异相之一。 2. The light guide according to claim 1, wherein the change characteristic of the prism grooves and an adjacent one is out of phase with the phase.
3.如权利要求1所述的光导,其特征在于,该特性被排列成沿槽轴线在位于越靠近输入边缘表面的位置具有越大的数值。 The light guide according to claim 1, wherein the characteristic is arranged along the axis of the slot has a greater value in the input edge is located closer to the surface location.
4.如权利要求1所述的光导,其特征在于,该特性包括沿槽轴线的长度具有离散的特性变化。 4. The light guide according to claim 1, wherein the characteristic comprises a length axis along the slot having discrete characteristic change.
5.如权利要求1所述的光导,其特征在于,该特性包括沿槽轴线的长度具有连续的特性变化。 The light guide according to claim 1, wherein the characteristic comprises a length axis along the groove has a continuous characteristic change.
6.如权利要求1所述的光导,其特征在于,该特性与棱镜槽的光学能量有关,并且光学能量沿槽轴线从位于靠近输入边缘的槽轴线上的位置到位于远离输入边缘的槽轴线上的位置,从第一数值逐渐减少到小于第一数值的第二数值。 6. The light guide according to claim 1, wherein the energy characteristics of the optical prism grooves is related to the optical power along the groove axis and away from the input axis of the groove from a position on the edge located adjacent to the input edge of the slot axis is located positions, gradually decreases from a first value to a second value smaller than the first value.
7.如权利要求1所述的光导,其特征在于,包括形成在第二表面中的多个棱镜槽。 7. The light guide according to claim 1, wherein the prism comprises a plurality of grooves formed in the second surface.
8.如权利要求1所述的光导,其特征在于,包括形成在第二表面中的漫射图案。 The light guide as claimed in claim 1, wherein the diffusion pattern comprises forming the second surface.
CN 01812770 1999-10-08 2001-07-05 Backlight with structured sufaces CN100350308C (en)

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