Display backlight system

A technology of optocoupler and light guide plate, which is applied in the field of backlight, and can solve the problems of bulky display devices, damage to the efficiency and overall brightness of light emitting devices, etc.

Inactive Publication Date: 2014-08-27
KONINKLJIJKE PHILIPS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such a diffuser impairs the efficiency and overall brightness of the light-emitting device and results in a bulky display device

Method used

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Embodiment Construction

[0030] As used herein, "optical anisotropy" means that the optical properties of a medium show a dependence on the direction of propagation of light in the medium and are capable of changing the polarization state of said light inside the medium. In contrast, an "optically isotropic" medium refers to a medium in which light shows no dependence on the direction of propagation, and in which the polarization state of light propagating within the system cannot be changed.

[0031] As used herein, "uniaxial orientation" refers to an entity having axes oriented generally tending in the same direction.

[0032] As used herein, two objects "in optical contact" means that the path of light can extend from one object to the other, optionally via another medium having a refractive index similar to each of said objects . "Direct optical contact" is intended to mean that the path of the light extends from the first object to the second object without having to pass through an intermediate...

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Abstract

A lighting device is provided, comprising: a light-emitting arrangement comprising a solid state light source capable of emitting light of a first wavelength range, and having a light outcoupling surface; and a polarizing color converting layer (104) arranged to receive light that is outcoupled from said light outcoupling surface, and comprising i) a color converting elements (105) capable of converting light of said first wavelength range into light of a second wavelength range, and ii) at least one region of an optically anisotropic material (108), and at least one region of an optically isotropic material (109), wherein said polarizing color converting layer is capable of preferentially scattering one linear polarization direction of light received from the light-emitting arrangement. The lighting device of the invention provides improved polarization efficiency. The lighting device may be used as a backlight in a display device such as an LCD device.

Description

technical field [0001] The present invention relates to backlights for display devices, in particular for LCD displays. Background technique [0002] Today, various types of flat panel displays are used in a variety of applications, from mobile phone displays to large-screen televisions. While some types of flat-panel displays, such as so-called plasma displays, consist of arrays of light-emitting pixels, most flat-panel displays have arrays of pixels that are capable of switching between states but do not emit light independently. Such flat panel displays include the ubiquitous LCD displays. In order for such flat panel displays to be able to display images for the user, the pixel array must be illuminated by a so-called backlight in the case of transmissive pixel arrays, or by ambient light or a so-called front light in the case of reflective pixel arrays. [0003] Traditional backlights consist of a planar light guide into which light from a light source is coupled. On...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13357G02F1/1335G02B5/30
CPCB82Y20/00G02F1/133533G02B6/0023G02F1/133621F21V9/08G02B5/3008Y10S977/95G02F2001/133614G02F1/13362F21V9/14G02F1/133614
Inventor R·A·M·希克麦特T·范博默
Owner KONINKLJIJKE PHILIPS NV
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