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Illumination arrangement

A technology of lighting structure and display, applied in the direction of light guide, static indicator, instrument, etc. of lighting system, can solve the problems of reducing system efficiency, lack of efficiency of polarized light lighting structure, increasing the complexity of lighting system, etc., to achieve the effect of effective polarization

Inactive Publication Date: 2005-08-24
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, the problem generally existing in the field of the present invention is that today's lighting structures for providing polarized light lack efficiency
Needless to say, this increases the complexity of the lighting system or, if no calibration is applied, seriously reduces the efficiency of the system

Method used

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Embodiment Construction

[0035] For the purpose of introducing terminology relating to the geometry of the field of the invention, and expressing limitations associated with prior art structures according to the aforementioned US 5,845,035, Figure 1a and Figure 1b represents the entry index of refraction as n i The light L of the optically isotropic substrate 101. On top of the isotropic substrate 101 is an anisotropic top layer 102 having a refractive index of n along each anisotropic direction o and n e .

[0036] A disadvantage with regard to the prior art as disclosed in US 5,845,035 is that polarization separation occurs only under limited conditions and for a limited angle of incidence θ: not n o should be with n i match, it is n e should be with n i Matched so that polarization separation occurs at the interface 103 between the isotropic substrate 101 and the top layer 102 . which is:

[0037] 1.n o e , n o =n i

[0038] Coupling Input Anisotropic Layer

[0039] sin(θ)>sin(θ c )...

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Abstract

An arrangement for providing polarized light to, e.g. a LCD, is disclosed. The arrangement comprises a substrate (201) and a top layer (202). The substrate (201) is preferably optically anisotropic and the top layer (202) is either isotropic or anisotropic. The respective indices of refraction are chosen such that polarization separation occurs at the interface (214) between the substrate (201) and the top layer (202). Furthermore, the indices of refraction are chosen such that there are no restrictions on the angle of incidence (thetai) of the incoming light (L), and hence obviating the need for collimation of the incoming light (L). The top layer (202) comprises light outcoupling structures, internally or externally.

Description

technical field [0001] The present invention relates to an illumination structure for providing polarized light to a flat panel display and a display comprising such an illumination structure. Background technique [0002] Today, liquid crystal-type flat panel displays (ie, LCDs) are widely used in various products and application fields with different characteristics. Many applications include small portable battery powered units such as portable telephones and computers. An obvious important feature of this application is that energy consumption is a decisive factor for consumers to consider when choosing between products from different manufacturers. [0003] The requirement for a backside illuminated LCD is that it must be illuminated with linearly polarized light in order to function properly. In order to obtain polarized light, means for polarizing "ordinary" unpolarized light must be used. This usually requires placing a so-called polarizer in the path of the unpol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/13357F21V8/00G02B27/28
CPCG02B6/0056G02F1/13362G02F1/1335
Inventor H·J·B·亚格特H·J·科尔内利森D·J·布雷尔C·巴斯蒂安森
Owner KONINK PHILIPS ELECTRONICS NV