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Waveguide for autostereoscopic display

A display and waveguide technology, applied in the waveguide field, can solve the problems of low efficiency and loss of barrier-type displays

Active Publication Date: 2006-12-06
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, barrier-type displays are inefficient because a significant portion of the light generated by the backlight 3 is lost

Method used

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  • Waveguide for autostereoscopic display
  • Waveguide for autostereoscopic display
  • Waveguide for autostereoscopic display

Examples

Experimental program
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Embodiment Construction

[0040] figure 2 A display 8 is shown comprising a display panel 2 and an illumination system comprising a backlight 3 such as glow stick lights and a waveguide 9 .

[0041]In this example, the display panel 2 comprises a layer of electro-optical active material, such as a liquid crystal material, sandwiched between two light-transmitting substrates (not shown). For liquid crystal layers, the operation of this layer can be based, for example, on twisted nematics (TN), supertwisted nematics (STNs), vertically aligned nematics (VANs), optically compensated birefringence ( OCB), in-plane switched nematic (IPS) or ferroelectric effect. The display panel 2 is divided into an array of pixels and is provided with an active matrix or passive matrix arrangement (not shown) for driving these pixels so that an image is displayed in a manner well known per se.

[0042] The waveguide 9 comprises an array of portions 10a to 10f of diffuse material. Examples of suitable diffusing material...

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PUM

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Abstract

A display 17 comprises a display panel 2 and a backlighting system comprising a light source 3 and waveguide 18. The waveguide 18 comprises a plurality of portions of diffusing material 1Oa to 10f. Light propagates through the waveguide 18 by means of total internal reflection, but may be scattered by a portion 10a to 10f. Scattered light leaving the waveguide 18 through its exit face 15 produces a pattern of light lines for use in illuminating a 3D autostereoscopic image displayed by the display panel 2. Intervening portions 19a to 19f may be provided, formed from a material such as a liquid crystal gel that can be switched between a light transmissive state and a diffusive state. Optical properties of the intervening portions 19a to 19f may be controlled using electric fields. Such a display 17 can be switched between a 2D image mode, in which the intervening portions 19a to 19f are diffusive and the waveguide 18 provides uniform illumination, and a 3D image mode, in which the intervening portions 19a to 19f are transmissive and the waveguide 18 provides illumination in the form of light lines. If the intervening portions 19a to 19f are controlled using passive or active matrix addressing, the waveguide 18 may provide uniform illumination 26 for a first area of the display panel 2 and light lines 27 for a second area of the display panel 2, allowing 2D and 3D images to be displayed simultaneously. The display 38 may further comprise means 40, 41, 42 for detecting the position of a viewer 6 and adjusting the image displayed and the position and / or pitch of light lines accordingly, in order to provide a 3D image that can be seen from the detected viewer position.

Description

technical field [0001] The present invention relates to waveguides for use in autostereoscopic display devices. Background technique [0002] Shutter display devices, such as liquid crystal displays (LCD), are generally known in which a backlight is modulated on a pixel-by-pixel basis by means of a matrix of liquid crystals. Such devices typically produce two-dimensional (2D) images. However, research and development of three-dimensional (3D) displays has advanced rapidly. For reasons of cost efficiency and user convenience, display systems that do not require users to wear special glasses to view 3D images have been developed. Such display systems are known as autostereoscopic displays. [0003] Autostereoscopic displays typically comprise a conventional display panel, such as an LCD, and means for providing a pair of images, one image seen by the viewer's left eye and the other image seen by the viewer's right eye. For example, 3D images can be produced using an array ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/00G02B27/22H04N13/00G02F1/13357F21V8/00G02F1/1333G02F1/1334G02F1/1335
CPCH04N13/0454H04N13/0456G02B27/2214H04N13/0409G02F2001/13345G02F1/133615G02F1/1326G02B6/0041H04N13/0418G02F1/13345H04N13/31H04N13/32H04N13/359H04N13/361G02B5/02G02B6/00G02F1/1335G02B30/27
Inventor W·L·伊泽尔曼M·J·J·亚克
Owner KONINKLIJKE PHILIPS ELECTRONICS NV