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Polarizing turning film using total internal reflection

A technology of internal reflection and orientation, applied in the field of turning film, can solve the problems of insufficient flexibility, low cost, and insufficient solution

Inactive Publication Date: 2009-03-25
SKC HI TECH & MARKETING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Thus, it can be seen that while attempts have been made to provide polarized lighting by combining the polarization function with other components, these attempts have not been flexible enough, cheap enough, and solutions are not effective enough

Method used

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  • Polarizing turning film using total internal reflection
  • Polarizing turning film using total internal reflection
  • Polarizing turning film using total internal reflection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] See the contour curves of Figures 8A-8D for an angle of incidence θ in= 63°. In these figures, the abscissa (x-axis) shows the distal base angle; the ordinate (y-axis) shows the refractive index n. Figures 8A to 8D are arranged in the order described for Figure 3A. FIG. 8A shows the response curve at the first interface, that is, when light is incident from the light guide plate 10 onto the flat surface 22 . FIG. 8B shows the response curve for light incident on the far surface 26 at the second interface, turning film 20 . Figure 8C shows the exit angle response, θ out . Figure 8D is a composite contour plot showing the superposition of the combination of conditions shown in Figures 8A, 8B and 8C. The composite contour of Figure 8D shows the "working space" available for turning film 20 design to provide optimal polarization separation.

[0089] Figure 8A is an isocurve with regions 1 and 2, which respectively show that the distal base angle β1 and the refractive ...

Embodiment 2

[0096] Figures 9A-9D show a sequence similar to Figures 8A-8D, using the same light redirecting structures and materials as Figures 8A-8D, but with a principal angle of incidence θ in =70°. By comparing with Figure 8A, it is found that for the range of 1.5in -θ b Region 1 where |in -θ b |in -θ b |out |in -θ b |4 -θ b |out |in -θ b |4 -θ b |out |in -θ b |4 -θ b |<10°.

Embodiment 3

[0098] Figures 10A-10D The sequence shown is similar to that of Figures 9A-9D, using the same structure and materials, but with the principal angle of incidence θ in =75°. exist Figure 10A In the range of 1.5in -θ b |in -θ b | Figure 10A Region 3 in satisfies |θ in -θ b | Figure 10B Other features in and 10C are similar to those in FIG. 9B and FIG. 9C in Embodiment 2. exist Figure 10D , region 3 satisfies |θ out |in -θ b |4 -θ b |out |in -θ b |4 -θ b |<10°.

[0099] As an advantage of the present invention, polarization turning film 20 can be formed as a light redirecting article that can be adapted to receive light at more than one main angle or a range of main angles. Referring again to FIG. 3A, the principal axis of the first range is used to determine the relative tilt of the distal surface 26 when the turning film 20 is set in the first position. On the other hand, the turning film 20 can also be used in one orientation, in which case the turning film 20 ...

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PUM

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Abstract

A light redirecting article redirects light toward a target angle. The light redirecting article has an input surface for accepting incident illumination over a range of incident angles and an output surface with a plurality of light redirecting structures, each light redirecting structure having an internal reflection surface oriented at a first angle with respect to the plane of the input surface and an exit surface for emitting an output light at an emitted light angle, wherein the exit surface is oriented at a second angle relative the plane of the input surface. For incident illumination at a principal angle greater than 60 degrees from normal, light is reflected from the internal reflection surface and emitted from the exit surface at an emitted light angle that is within 5 degrees of the target angle.

Description

field of invention [0001] The present invention relates generally to display lighting articles for enhancing brightness from a surface, and more particularly to a turning film for redirecting light from a light guide plate and providing polarized light output. Background of the invention [0002] Liquid crystal displays (LCDs) continue to improve in cost and performance, making them the display type of choice for many computer, instrumentation, and entertainment applications. A transmissive LCD, as used in conventional laptop computer displays, is a backlit display with a surface disposed behind the LCD that directs light outward toward the LCD. The problem of providing a suitable backlight device with sufficiently uniform brightness, while still maintaining compactness and low cost, has been solved in one of two basic ways. In the first approach, a light-providing surface is used to provide highly scattered light with substantially constant brightness over a wide range of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/00
CPCG02B6/0056G02B6/0053G02B5/30G02B6/00G02F1/1335
Inventor X-D·米
Owner SKC HI TECH & MARKETING CO LTD