CN1330189C - 应用锥形波导的平板显示器 - Google Patents
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Abstract
一种锥形波导显示器装置包括一个背板形式的输入波导(2),从一个投影器(6)将光线入射到该波导一端,使得该光线沿该波导回弹并从其另一端射出,该锥形波导显示器装置还包括一个锥形的输出波导(1),用于在锥形板的平末端接收来自输入波导的光线,并以更陡的角度回弹直到该角度到达临界角,此时光线从该锥形板的表面发射出去;为了消除显示器中的阴影间隙,改变该锥形波导的厚度轮廓以使所有光线在射出该锥形波导之前回弹相同的次数。
Description
技术领域
本发明涉及一种在锥形波导显示器中消除失真的方法,其中光线进入锥形背板波导的钝端。
背景技术
这种锥形波导显示器包括一个视频投影器,一个平直的背板波导,称为“输入”或“扩展”波导,用于沿宽度方向扩散来自投影器的光线,一个透明材料的锥形片用做一个泄露波导,光线从其表面的一点射出,该点是由光线入射的角度确定的。该锥形板开始处的厚度与扩展波导的厚度相同并逐渐减小为0。以接近临界角的某一角度进入锥形板的光线更陡地来回反弹,直到在沿锥形板的某一个距离处射出,该距离依赖于入射的初始角。该系统描述在该申请人较早的申请WO01/72037中。
由于这些显示器的屏幕不需要薄膜晶体管且可以用塑料制成,因此价格低且坚固耐用,但是入射的图像可能会失真。具体而言,进入锥形板的一些射线,在临界角处不能到达锥形输出波导上存在的一些点,因此图像被分割成中间具有阴影间隙的光带。这样在第n次反弹和第n+1次反弹之间没有光线射出。这个问题是需要解决的。
发明内容
根据本发明,提供了一种锥形波导光学装置,包括:背板形式的输入波导(2),入射到该波导一端的光线沿该波导反弹并从其另一端射出;锥形输出波导(1),用于在该锥形输出波导的厚端接收来自所述输入波导的光线,并通过在该锥形输出波导内的反射使光线传播一定的距离,然后当在该锥形输出波导的一个表面处的入射角超过临界角时使光线从该表面发射出去;其中该锥形输出波导的厚度轮廓使得以不同入射角进入的光线穿过上述两个波导时整体上反弹相同的次数,然后射出该锥形输出波导。
在更早的申请中,锥形波导的楔形形状是平面的,这就意味着可能存在一些间隙,在光线到达临界角之前,随着光线沿锥形板内的输入背板以及随后沿锥形背板的内反射,光线会在这些间隙内不只一次地来回反弹。已经发现与锥形波导的表面平直(flat)的轻微偏差通过确保反弹的次数总是相同的可以补偿这个效应。这是由于已经具有一个使反弹次数平衡的内在趋势:以一个小角度入射的射线在输入背板中经常会反弹较少,但是在输出背板中停留更长,反之亦然。
锥形背板的形状可应用射线跟踪计算,如果用于在一维上扩散图像的输入或扩展板在背板的平面上是一个(平直的)立方体,该计算将非常简单。该输入背板可以与锥形板是一体的,也可以与之是分开的;可以处于相同的平面上用光学装置使之或“折叠”。通常,输入和输出波导具有大约相同的设计形状,因此可对半折叠该装置的端部。
根据本发明的另一个方面,提供一种制作锥形波导光学装置的方法,其中该光学装置包括背板形式的输入波导(2),入射到该输入波导一端的光线沿该输入波导反弹并从其另一端射出,该光学装置还包括锥形输出波导(1),用于在其厚端接收来自所述输入波导的光线,并使光线传播一定的距离,然后当该锥形输出波导内的角度超过临界角时使光线从其表面上射出;
其中该方法包括:
从所述输入波导内的最大反弹次数开始,计算该输入波导内每减少一个双反弹的该锥形输出波导的厚度,并且
计算从该锥形输出波导的所述厚端开始的相应距离,以确保所述光线在该锥形输出波导内经历了一个额外的双弹跳,从而确保整个弹跳次数是一致的;
对于所述输入波导内每减少一次双反弹,重复进行这种锥形厚度以及距该锥形输出波导的所述厚端的距离的计算,直到该锥形输出波导的厚度达到下限,以及
相应形成该锥形输出波导或该锥形输出波导的摸具。
虽然该装置是按照显示器来描述的,但是其也可以反向作为摄像机(camera)操作,如申请人较早的申请PCT/GB01/5266中所述。如果光源是一个简单的点光源,则该装置就成为一个简单的光源,应用于LCD或全息照明。
为了更好地理解本发明,以下将通过例子并参考附图描述本发明的实施例。
附图说明
图1所示为用于计算锥形波导的适当厚度轮廓的一个例示算法;
图2所示为应用图1中的算法计算的锥形波导的轮廓;
图3所示为穿过锥形波导的射线的轨迹,其中图3a所示为每个射线经过574次反弹后的情况,图3b所示为每个射线经过575次反弹后的情况;
图4所示为成形的锥形板的一个实施例中厚度(t)相对于长度(z)的配置;
图5所示为如何折叠背板和锥形板,其中在背板的短边沿具有一个大型镜面校准器。
图6所示为如何应用一系列隔栅和小散射区来降低模糊和提高反差比。
图7所示为显示器装置的示意图。
具体实施方式
图7示出了本发明采用的总体布置。一个投影器6(或如果该装置反向操作时的一个摄像机,或只是一个用于产生区域照明的点光源)发射(或接收)将光线投入到矩形背板波导2的一个边沿,该光线是由像素阵列构成的图像。在该波导中光线通过交替地在主表面上反射进行传播。该背板通常具有平直的平行表面,虽然这一点不是必需的。当光线传播时,其在背板的平面上并垂直于传播的方向上横向扩散,在远端达到背板的整个宽度。这样,图像好象在宽度方向上被放大了。在那里,光线由一个柱面透镜校准以进入相等宽度的背板波导1的钝端,但是该背板波导1在远离投影器的高度方向上锥形化。这里,光线在不断增加(更陡)的角度上进行内反射,直到以Snell定律所给出的临界角射出,例如可形成一个显示器。该原理描述在WO01/72037中。
成形的锥形板是通过应用一个算法制成的,应用该算法计算锥形板的一系列厚度和这些厚度之间的距离,然后将这些数据输入到一个数字控制机器中,该数字控制机器直接加工成形该锥形波导或加工成形一个模具以制作该锥形波导。也可以应用其他的加工方法制作该锥形波导。
该算法开始于对全部内部反射确定射线角等于临界角的射线,该内部反射在背板/锥形板的边界射离背板和锥形板的表面。当该射线沿输入背板传播时,将会反弹最大可能的次数,并且将在第一次反弹时射出该锥形波导。该算法确定射线在该输入背板中少经历一个双反弹时所需的射线角变化,然后计算该射线将要从该锥形板中射出的锥形板的厚度。然后,该算法计算从该锥形板的入口(即,厚端)到该射线射出的点之间所需的距离以使该射线在该锥形波导中多经历一个双反弹,从而保持反弹的总数为常数,并且该算法将该锥形延伸配置为一个锥形厚度的新值。以上处理过程对于连续的射线角重复执行,直到锥形板的厚度减小为0。
通过计算实验射线穿过该背板的传播情况可得到射线在该输入背板中少经过一个双反弹时射线角所需的变化——该处理称为射线跟踪。在该实施例中,输入或扩展背板具有平行的表面,并且射线角θin用以下的三角公式给出:
其中b是比临界角的射线反弹次数少的反弹次数,tin是扩展背板和锥形板输入端的厚度,2L是扩展背板的长度,θc是临界角。在此假定用玻璃制作背板,但是也可以应用任何适合的材料。
利用当射线进入该锥形板时,射线相对于玻璃/空气界面的发现的射线角θin计算射线从锥形板中射出时的锥形板的厚度tc,其计算公式如下:
通过跟踪一个以角度θin穿过该锥形板的射线,可得到从该锥形板的入口到该射线射出的点之间所需的距离以使该射线在该锥形波导中多经历一个双反弹。在任何双反弹过程中,射线移动的距离可以用三角形式表示为在该点的楔形厚度t的两倍乘以该点的射线角θ的正切。与厚度相关的射线角的正切计算如下:
图2示出了该实施例中锥形板的轮廓,该轮廓是应用图1中所示的算法计算的,只是在可执行代码的第三行中有一处改变:crit被设置为等于1/1.491756(即,光线在丙烯酸中的临界角)的反正弦。四个实验射线穿过1270mm长,起点为2.5mm厚的背板以及然后具有如图2所示轮廓的锥形板时的两个轨迹如图3所示。图3示出了射线在纵轴上沿锥形板并垂直于横轴的平面传播的情况。在图3a中,射线经过574次反弹且不从锥形板中射出。在图3b中,射线具有一个额外的反弹且所有射线,无论是锥形板起点附近的射线还是锥形板终点附近的射线,都从锥形板中射出。因此,输入射线角的改变不会引起反弹次数的任何改变,这样在任何点都不会产生阴影间隙。
图1中的代码稍有粗略,因此,锥形板的形状还应该应用诸如Zemax的射线跟踪程序通过实验和校正来调整,以得到一个可以使所有射线经过相同次数的反弹之后以大约相同的射出角度射离该锥形板的轮廓。以上实验可通过跟踪一个射线,使其在楔形的厚端射出,然后逐渐减小跟踪射线的入射角度来实现。如果一个射线在射出时角度太小或反弹的次数太多,则该射线射出的位置与以前跟踪射线射出的位置之间的锥形部分应该缩小。如果一个射线在射出时角度太大或反弹的次数太少,则该射线射出的位置与以前跟踪射线射出的位置之间的锥形部分应该增长。
看起来在一定限制条件下锥形板的精确形状是不重要的,重要的是沿长度方向的锥形板的厚度。锥形板的一个表面可以为平面,或两个平面为波浪形,或其他任何形状。
图4示出了采用本发明的锥形板的厚度和长度的配置,其中锥形板的厚端厚度为15mm,锥形板的长度约为1130mm,与其相接的背板的长度为1270mm,厚度为15mm。图5示出了正视的平面图中的锥形板1以及扩展背板2,在背板2上有一个折叠3以合并背板2和成形的锥形板1的过渡,在背板/锥形板界面的任一侧有一个44mm区,其是一个平滑的曲线4,该曲线的弧度半径为8500mm。
如果需要一个较厚的锥形板,则背板和锥形板的厚度应该线性地调整。如果需要一个更长的锥形板,则背板和锥形板的长度应该线性地调整。
如果在所有投影角度上都要避免出现间隙,则重要的是当射线在背板和锥形板之间校准时,从投影器到楔形的光路长度不会被改变。因此,不适合应用菲涅耳反射镜,但是传统校准镜将使显示器的边沿出现弯曲的效果。为了使该弯曲最小,射线被平行于显示器(建议其为通常的矩形)的较长尺寸入射到位于较短侧的镜面5上,如图5所示。至少对于一个显示器来说,该波导的高宽比通常小于2。图5中未示出背板内的折叠,如果需要将视频投影器6放置在显示器的一个较长侧的中央,且将半透明屏幕设在锥形波导的上部,则建议引入背板内的折叠以使任何方向都可看到图像。
当射线的入射角到达刚刚小于临界角的角度时,射线只被部分传播,且不需要的反射射线成分将以模糊了相邻的象素的方式沿波导射出。但是,该反射成分以比开始时更陡的角度射出,避免模糊的一个方法是在距波导的一个距离处隔开该不透明的屏幕,从而当射线撞击屏幕时其两种成分是一致的。该方法的缺点是其将使整个显示器更厚,在任何情况下,本发明中改进的显示器需要比正常的显示器更厚以保持宽域(étendue)。
因此,优选为在锥形波导板7上设置一系列不透明的隔栅8,如图6所示。以便当射线首先以小于临界角的角度入射时所传输的射线成分10通过,但是这些隔栅可阻止反射的射线成分11。散射元件9如荧光体或折射表面应该放置在每个隔栅的端部,并使该散射元件很小,这样大部分环境光12将被这些隔栅吸收。元件9可以选择是放射的,如可被短波激发的荧光体,该短波可能是UV、输入光线。本发明所得到的屏幕薄且没有模糊,具有良好的反差比且不需要抗反射涂层。
Claims (10)
1、一种锥形波导光学装置,包括:背板形式的输入波导(2),入射到该波导一端的光线沿该波导反弹并从其另一端射出;锥形输出波导(1),用于在该锥形输出波导的厚端接收来自所述输入波导的光线,并通过在该锥形输出波导内的反射使光线传播一定的距离,然后当在该锥形输出波导的一个表面处的入射角超过临界角时使光线从该表面发射出去;其中该锥形输出波导的厚度轮廓使得以不同入射角进入的光线穿过上述两个波导时整体上反弹相同的次数,然后射出该锥形输出波导。
2、根据权利要求1所述的光学装置,其中输入波导(2)是平直的矩形立方体。
3、根据权利要求1或2所述的光学装置,其中所述两个波导由相同的材料制成。
4、根据权利要求1或2所述的光学装置,还包括一个在所述输入波导和锥形输出波导之间引导光线的校准元件(5),以便在该锥形输出波导的平面内分解后,光线基本平行地传输。
5、根据权利要求1或2所述的光学装置,还包括一个屏幕,该屏幕位于该锥形输出波导上,用于扩散射出的光线以增加视角。
6、根据权利要求5所述的光学装置,其中该屏幕包括以适于使所述射出的射线通过的角度倾斜的隔栅(8),该屏幕还包括这些隔栅之间的散射元件(9)。
7、根据权利要求1或2所述的光学装置,还包括一个用于入射图像到输入波导上以形成显示的视频投影器(6)。
8、根据权利要求1或2所述的光学装置,还包括一个有效的点光源,因此该装置可用做一个平面光源。
9、根据权利要求1或2所述的光学装置,其中该输入和锥形输出波导(1、2)被折叠(3),以便其中一个波导放置在另一个波导上。
10、一种制作锥形波导光学装置的方法,其中该光学装置包括:背板形式的输入波导(2),入射到该输入波导一端的光线沿该输入波导反弹并从其另一端射出;该光学装置还包括锥形输出波导(1),用于在其厚端接收来自所述输入波导的光线,并使光线传播一定的距离,然后当该锥形输出波导内的角度超过临界角时使光线从其表面上射出;
其中该方法包括:
从所述输入波导内的最大反弹次数开始,计算该输入波导内每减少一个双反弹的该锥形输出波导的厚度,并且
计算从该锥形输出波导的所述厚端开始的相应距离,以确保所述光线在该锥形输出波导内经历了一个额外的双弹跳,从而确保整个弹跳次数是一致的;
对于所述输入波导内每减少一次双反弹,重复进行这种锥形厚度以及距该锥形输出波导的所述厚端的距离的计算,直到该锥形输出波导的厚度达到下限,以及
相应形成该锥形输出波导或该锥形输出波导的模具。
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- 2002-08-01 CN CNB028152271A patent/CN1330189C/zh not_active Expired - Fee Related
- 2002-08-01 US US10/485,888 patent/US7410286B2/en not_active Expired - Fee Related
- 2002-08-01 AU AU2002317406A patent/AU2002317406A1/en not_active Abandoned
- 2002-08-01 DE DE60208049T patent/DE60208049T2/de not_active Expired - Lifetime
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- 2002-08-01 JP JP2003518193A patent/JP4291141B2/ja not_active Expired - Lifetime
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Also Published As
Publication number | Publication date |
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KR20040035697A (ko) | 2004-04-29 |
GB0118866D0 (en) | 2001-09-26 |
JP4291141B2 (ja) | 2009-07-08 |
CN1539245A (zh) | 2004-10-20 |
WO2003013151A3 (en) | 2003-12-18 |
AU2002317406A1 (en) | 2003-02-17 |
DE60208049D1 (de) | 2006-01-19 |
TWI222536B (en) | 2004-10-21 |
EP1417843B1 (en) | 2005-12-14 |
WO2003013151A2 (en) | 2003-02-13 |
KR100871521B1 (ko) | 2008-12-05 |
DE60208049T2 (de) | 2006-08-03 |
EP1417843A2 (en) | 2004-05-12 |
US20040196665A1 (en) | 2004-10-07 |
JP2004537766A (ja) | 2004-12-16 |
US7410286B2 (en) | 2008-08-12 |
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