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Backlight unit with reduced color separation including a polarizing turning film

A technology of backlight unit and thin film, applied in the field of light guide plate, can solve problems such as not providing satisfactory solutions

Inactive Publication Date: 2008-12-24
ROHM & HAAS DENMARK FINANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] One problem with turning films with an upward prism structure is the color separation due to the wavelength dependence of the refractive index of the film material
[0010] Thus, it can be seen that while attempts have been made to provide polarized illumination by incorporating polarization functionality with other components, these attempts have not provided a satisfactory solution

Method used

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  • Backlight unit with reduced color separation including a polarizing turning film
  • Backlight unit with reduced color separation including a polarizing turning film
  • Backlight unit with reduced color separation including a polarizing turning film

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Embodiment Construction

[0027] The present description relates in particular to elements forming part of, or more directly cooperating with, the device of the invention. It is to be understood that elements not specifically shown or described may take various forms well known to those skilled in the art.

[0028] As mentioned in the background section above, there have been attempts to reduce the overall complexity of the lighting arrangement by incorporating polarization functions in other elements along the lighting path. The method of the present invention is to reduce color separation of turning films, or more generally, of light redirecting elements of displays. Unlike the conventional methods described above, the method of the present invention uses microstructures in both the geometry and compositional design of the light redirecting component, thus accomplishing light redirection and polarization in a single element.

[0029] Turning film

[0030] As known in the art and discussed in the ...

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Abstract

A backlight unit contains a light source, a light guiding plate, and a turning film having a light entry and a light exit surface comprising first prismatic structures on the exit surface, wherein (a) the first prismatic structures on the turning film are characterized by a far base angle (beta1) and a near base angle (beta2); (b) the light source comprising an array of individual sources of differing colors; (c) the light guiding plate being located to provide light from each individual light source having a different principle angle to the turning film for each color; and the light guiding plate being arranged in a manner relative to the light source and the turning film and its first prismatic structures and base angles so as to reduce the amount of color separation at the exit surface of the turning film compared to the same device using a single light source.

Description

technical field [0001] The present invention mainly relates to a backlight unit including a light guide plate and a turning film part to improve brightness, and more particularly to a light guide plate which emits light of different wavelengths at different principal angles and provides output of polarized light, and by using A light source that contains separate light sources of different colors to reduce color separation. Background technique [0002] Liquid crystal displays (LCDs) continue to improve in cost and performance, making them the display type of choice for many computers, instruments, and entertainment devices. A transmissive LCD used in a conventional portable computer display is a backlight type display having a light-providing surface placed behind the LCD for directing light outward toward the LCD. One of two basic approaches has been taken to meet the challenge of providing a suitable backlight arrangement with sufficiently uniform brightness while mainta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13357G02B6/00G02F1/1335
CPCG02B6/0028G02B6/0038G02B5/30G02B6/00G02F1/1335
Inventor X·-D·米Q·洪
Owner ROHM & HAAS DENMARK FINANCE
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