CN100426503C - 具有用于产生一个成束光流的装置的仰视显示器 - Google Patents

具有用于产生一个成束光流的装置的仰视显示器 Download PDF

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CN100426503C
CN100426503C CNB03823307XA CN03823307A CN100426503C CN 100426503 C CN100426503 C CN 100426503C CN B03823307X A CNB03823307X A CN B03823307XA CN 03823307 A CN03823307 A CN 03823307A CN 100426503 C CN100426503 C CN 100426503C
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G·博纳
H·布赖尼希
B·卢德维希
R·迈尔
H·诺尔
J·E·索格
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Abstract

在一种用于产生成束光流的装置中，设有一个由发光二极管阵列构成的光源，在所述光源与一个光输出孔之间设置一个用于使发光二极管产生的光成束和散射的光学装置，该装置为了成束和散射包括一个栅格形反射体，它分别对于一个阵列点构成一个光通道，其通道壁是反射的，并且各光通道的面对光源的端部包括一个聚光透镜。

Description

具有用于产生一个成束光流的装置的仰视显示器
技术领域
本发明涉及一种仰视显示器，它具有一个用于产生一个成束光流的装置、一个光源和有一个含有光阀的图形再现装置。
背景技术
为了将信息传达给汽车司机而不必使司机的视野偏离行驶的道路或飞行的空间，已知所谓的仰视显示器，通过它将一个表示信息的图形集中于一个汽车的前玻璃上。为了在明亮的环境光线时也还可以看到图形，为此要求所述图形具有高亮度。用于其它的照明目的也需要成束的光流，例如作为读书灯或作为橱窗和展览的照射灯。
由美国专利5,836,676和5,043,716和日本公开文献7-130256分别已知在一个显示器中使用用于产生成束光流的装置。由美国专利4,935,665已知一种具有成束光射线的灯。但是这些所示装置由于其各自的成束特性和散射特性几乎不能用于仰视显示器。
发明内容
因此本发明的目的是，通过所述装置产生光流，这些装置尤其具有一个微小的结构尺寸和微小的重量，尽可能少地损失功率或者作为热量输出并因此也适用于在汽车中运行。
按照本发明这个目的通过如下所述的仰视显示器得以实现。在下文中还描述了适宜的改进方案。
根据本发明提供了一种具有一个用于产生一个成束光流的装置的仰视显示器，该仰视显示器具有：一个由发光二极管阵列构成的光源；一个用于使发光二极管产生的光成束和散射的光学装置，该用于成束和散射的光学装置设置在光源与一个光输出孔之间，并且包括一个栅格形反射体，该反射体分别对于一个阵列点构成一个光通道，该光通道的壁是反射的，并且各光通道的面对光源的端部包括一个聚光透镜；以及一个含有光阀的图形再现装置，该图形再现装置设置在用于成束和散射的光学装置的光输出孔上，其中在图形再现装置与光输出孔之间设置一个散射片。
在按照本发明的装置中已经证实有利的是，各阵列点由多个发光二极管构成，它们也可以是不同颜色的。此外本发明不局限于对每个光通道使用一个唯一的透镜。
按照本发明的装置的一种成本经济的加工由此实现，即所有光通道的聚光透镜一体地与一个设置在光源与栅格形反射体之间的平板连接。但是这个平板能够产生一个在横向上所不期望的光导，这一点可以由此避免，所述聚光透镜成组地一体地与设置在光源与栅格形反射体之间的桥接片连接。
本发明的一个有利的结构方案是，所述透镜的曲率在不同的方向上是不同的(象散的透镜)。由此尤其可以改善在长形光输出孔中的光分布。
另外一种有利的结构方案在于，在光输出孔上设置一个含有光阀的图形再现装置。这种改进方案能够实现一个紧凑的用于产生高分辨率图形的装置，它在整个图面上具有高的光密度和均匀的光密度分布。在此本装置为了成束和散射负责使由发光二极管产生的光集中到图形再现装置的平面上，而不会产生单个发光二极管的干扰投影。按照本发明的装置的一个优选的应用领域是用于汽车司机的图形的仰视显示器。
通过所述图形再现装置使按照本发明的装置还具有一些下面所述的优点。即，通过RGB光源与彩色显示器之间的协调一致能够在仰视显示器中在足够的光密度条件下实现图形的彩色图形的显示。通过反射体与透镜的共同作用在液晶显示器的表面上达到背景光照的均匀色彩分布和光密度分布。
在液晶彩色显示器中可以彩色地显示可配置的图形内容。因此图形内容可以适配于行驶状况。用于整个图形产生装置的安装空间在实际实现的示例中只需几立方厘米。通过选择发光二极管和从属的显示器的颜色可以影响要建立的色彩空间。例如代替一个RGB发光二极管光栅可以选择一个红绿发光二极管光栅并以相应的方式在液晶显示器中通过绿色滤波元件替换蓝色的滤波元件。由此得到一个具有明显更亮的光密度的有限色彩空间。
附图说明
本发明能够实现大量的实施方式。在附图中借助于多个图形示意示出其中的几个实施方式并在下面描述。附图中：
图1为一个实施例的截面图，
图2为图1中的实施例的栅格形反射体的俯视图，
图3为另一实施例的截面图，
图4为为了解释不同的细节示出的一个局部截面的放大图，
图5为另一实施例的一个局部截面的放大图，
图6为透镜屏的一部分。
具体实施方式
在按照图1和2的实施例中作为光源具有一个4×8组的光栅，每组分别具有四个发光二极管1，它们装配在一个衬底2上。桥接片3位于各组之间，其倾斜的表面作为反射体。
一个透镜屏4位于光源上，在透镜屏上连接一个栅格形反射体5。
所述桥接片3、透镜屏4以及栅格形反射体5的倾斜延伸的表面6起到一个均匀地分布光的作用。为了避免由于反射体5的桥接片7遮光，设有一个框架8，它在反射体5与液晶显示器9之间起到间隔的作用。一个散射片10位于液晶显示器9的下面，用于进一步改善液晶显示器9背景照明的均匀性。
所述框架8影响液晶显示器的倾斜位置，使得从上部入射的光不在相同的方向上反射，在该方向上光线也离开液晶显示器，以到达观察者。
图2示出按照图1的装置，但是去掉液晶显示器9和去掉散射片10。在按照图2的视图中所述发光二极管1本身可以透过透镜屏4看到。但是为了简单起见没有示出发光二极管1相应的失真。
按照图3的实施例示出一个发光装置，其中光输出孔由一个玻璃板18组成，它位于一个框架17上。这个实施例的其它部分与图1中的实施例一样地构成。
图4示出图1的一个局部截面放大图并用于解释所述液晶显示器和光源的细节。所述液晶显示器9在两个玻璃板11，12之间具有一个液晶板13以及一个滤色器14。该滤色器由一个光栅组成，该光栅具有三个不同颜色的色点，这在图4中通过不同的阴影线表示。与滤色器的光栅有关设有未示出的控制电极，它们分别与液晶板构成一个光阀。具有相互垂直的偏振面的偏振器15，16位于玻璃板11，12的外面。
在图4中同样详细示出通过图1简述的光源。
四个发光二极管1在一个子装配台(Submount)20上凸起地设置在一个由桥接片3构成的孔的中心处。所述发光二极管通过连接线21与导线25连接，它们仅仅示意通过其所占据表面的阴影线表示。在一个优选的实施例中一个发光二极管发红光，两个发绿光而第四个发蓝光。在这种布置中光混合成白色。在子装配台20与桥接片3之间的空间通过一种白色的浇铸材料22充满，其表面24作为从发光二极管1侧面发射出来的光的反射体。一种透明的浇铸材料23防止形成空腔。
在光源与透镜屏4之间的连接在图4所示的实施例中通过一个硅胶层26、一个偏振转化膜(PCF)层27和一个适当的粘接层28实现。
所述PCF层27的作用是，只允许通过发光二极管产生的光线中的那些在下偏振器15的方向上偏振的光通过，因此通过偏振作用在PCF层27中不会失去光线。其它的偏振光被PCF层反射并接着由表面24返回。其中具有相应偏振作用的分量仍然附加地穿过PCF层27到达，因此该PCF层总体上有利于提高亮度。
图5示出一个没有PCF层的实施例。此外在图5中示出的局部截面位于装置的边缘上。
图6示出一个透镜屏31，它具有八个透镜，它们通过桥接片32固定在一起。四个在图6中示出的透镜屏在按照图4和5的实施例中相邻地设置。

Claims (5)

1 一种具有一个用于产生一个成束光流的装置的仰视显示器，该仰视显示器具有：
一个由发光二极管阵列构成的光源，
一个用于使发光二极管产生的光成束和散射的光学装置，该用于成束和散射的光学装置设置在所述光源与一个光输出孔之间，并且包括一个栅格形反射体，该反射体分别对于一个阵列点构成一个光通道，该光通道的壁是反射的，并且各光通道的面对光源的端部包括一个聚光透镜，以及
一个含有光阀的图形再现装置，该图形再现装置设置在用于成束和散射的光学装置的光输出孔上，其中在图形再现装置与光输出孔之间设置一个散射片。
2 如权利要求1所述的仰视显示器，其特征在于，所有光通道的聚光透镜一体地与一个设置在光源和栅格形反射体之间的平板连接。
3 如权利要求1所述的仰视显示器，其特征在于，所述聚光透镜成组地一体地与设置在光源与栅格形反射体之间的桥接片连接。
4 如权利要求1到3中任一项所述的仰视显示器，其特征在于，所述聚光透镜的曲率在不同的方向上是不同的。
5 如权利要求1到3中任一项所述的仰视显示器，其特征在于，所述图形再现装置具有一个倾斜位置，使得入射的光在与光线离开图形再现装置以到达观察者的方向不同的方向上反射。
CNB03823307XA 2002-09-30 2003-09-01 具有用于产生一个成束光流的装置的仰视显示器 Expired - Fee Related CN100426503C (zh)

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* Cited by examiner, † Cited by third party
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CN102454906A (zh) * 2010-10-27 2012-05-16 夏普株式会社 照明装置
CN105829947A (zh) * 2013-12-18 2016-08-03 奥特司科技株式会社 平视显示器装置用液晶显示装置以及平视显示器装置

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