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Collimating light guide plate, diffusing unit, and display apparatus employing the same

a technology of light guide plate and light guide plate, which is applied in the direction of lighting and heating apparatus, instruments, polarising elements, etc., can solve the problems of gray scale inversion and color shift, narrow viewing angle, and still remain, and achieve the effect of improving transmittance and resolution

Inactive Publication Date: 2009-01-29
SAMSUNG DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]Exemplary embodiments of the present invention provide a diffusing unit, and a display apparatus with improved transmittance and resolution by employing the diffusing unit.
[0008]The present invention also provides a display apparatus employing the diffusing unit, which can increase a viewing angle and reduce gray scale inversion and color shifts.
[0009]The present invention also provides a light guide plate which collimates and provides light to a liquid crystal panel, and a display apparatus with reduced phase difference caused by obliquely incident light by employing the light guide plate.

Problems solved by technology

In this case, however, a viewing angle is narrow because of a difference in an optical path between light propagating perpendicular to a screen and light obliquely propagating to the screen.
However, there still remain gray scale inversion and color shifts, especially in the oblique viewing angle.
However, there are structural limitations in collimating light using the prism sheet and resolution is sacrificed.
When used outdoors, external light is reflected by the diffusing plate and the air layer, thereby reducing visibility as well.

Method used

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  • Collimating light guide plate, diffusing unit, and display apparatus employing the same
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Embodiment Construction

[0036]The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown.

[0037]FIG. 1 is a cross-sectional view of a display apparatus according to an exemplary embodiment of the present invention. Referring to FIG. 1, the display apparatus includes a backlight unit 10, a liquid crystal layer 35 forming an image using light emitted by the backlight unit 10, a first polarizing plate 31 disposed below the liquid crystal layer 35, and a diffusing unit 50 disposed over the liquid crystal layer 35.

[0038]The diffusing unit 50 includes a second polarizing plate 52 disposed over the liquid crystal layer 35 and a diffusing layer 55 integrally provided on a surface of the second polarizing plate 52 without an air layer therebetween. The diffusing layer 55 for diffusing light may be formed by coating a binder containing beads on a surface of the second polarizing plate 52. Since the second polarizing pla...

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Abstract

A diffusing unit includes: a polarizing plate; and a diffusing layer integrally provided on a surface of the polarizing plate without an air layer therebetween. By using a display apparatus employing a collimating light guide plate and the diffusing unit, the optical performances such as resolution and viewing angle can be improved. Also, because gray scale inversion and color shifts can be reduced or eliminated using collimated light, image quality of the display apparatus can be improved.

Description

CROSS-REFERENCE TO RELATED PATENT APPLICATIONS[0001]This application claims priority from Korean Patent Application No. 10-2007-0075910, filed on Jul. 27, 2007, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]Apparatuses consistent with the present invention relate to a collimating light guide plate and a diffusing unit. A display apparatus employing the collimating light guide plate and the diffusing unit shows improved optical performances such as light transmittance, viewing angle, and resolution.[0004]2. Description of the Related Art[0005]As portable devices, such as mobile phones, personal digital assistants (PDAs), portable multimedia players (PMPs), digital multimedia broadcasting (DMB) systems, and notebook computers, have widely prevailed in recent years, there are demands for display apparatuses having low power consumption and high outdo...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G02F1/13357G02B5/02F21V8/00
CPCG02B5/0226G02B5/0242G02B5/0278G02B5/045G02B6/0028G02F1/1336G02B6/0051G02F1/133504G02F1/133528G02B6/0053G02F1/133514G02B6/0036G02B5/02G02B5/30G02F1/1335
Inventor HWANG, SEONG-MOMIN, JEE-HONGLEE, MOON-GYUCHOE, KYU-MIN
Owner SAMSUNG DISPLAY CO LTD
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