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Backlight unit and liquid crystal display device using the same

A backlight unit and equipment technology, applied to optical elements, light guides, optics, etc., can solve the problems of backlight unit 200 such as increased thickness and weight, large color changes, and inability to mix light, so as to achieve display with excellent color reproducibility, The effect of reducing the area and uniform light intensity

Inactive Publication Date: 2006-01-04
NEC LCD TECH CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the shape becomes larger
In addition, since a plurality of light guides 203 are used in a stacked manner, there is a problem that the thickness and weight of the backlight unit 200 become large
However, this backlight unit has a problem that the light emitted from the LEDs of the light source cannot be effectively mixed on the effective light emitting area of ​​the backlight unit.
So the problem is that there is a big color change depending on the distance from the light source

Method used

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  • Backlight unit and liquid crystal display device using the same
  • Backlight unit and liquid crystal display device using the same
  • Backlight unit and liquid crystal display device using the same

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Embodiment Construction

[0035] Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

[0036] First, a first exemplary embodiment of the present invention will be described in detail with reference to the drawings. A case where a side-emitting LED is used as a light-emitting element of the side-emitting type will be described. As shown in FIG. 1A , side-emitting LEDs 1 are LEDs 1R, 1G, and 1B, each of which emits red, green, or blue monochromatic light. These LEDs are arranged in sequence and assembled on the LED array substrate 2 . Each side-emitting LED 1 has the following luminous characteristics: the angle at which the emission intensity becomes maximum is within + / - 20 degrees from the direction parallel to the LED array substrate 2 . As such side-emitting LEDs, Luxeon series side-emitting LEDs produced by Lumileds Lighting (technical literature mentioned in "Background Art") can be used.

[0037]The light guide 3 has upper and low...

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Abstract

Light emitted in side surface directions from side-emitting red, green, and blue LEDs which are arranged on an LED array substrate is introduced into a light guide from side surfaces of a groove-shaped recessed portion, and propagates in the light guide. Thus, the three colors are mixed. The light further propagates in the light guide while being reflected at both side end surfaces of the light guide by the function of a reflective sheet and the like. Thus, color mixing progresses. Further, the light is reflected upward by diffuse reflective means provided on the lower surface of the light guide, and emitted as backlight light to the outside through a diffuse sheet.

Description

technical field [0001] The invention relates to a backlight unit and a liquid crystal display device using the same. In particular, the present invention relates to a backlight unit using a light emitting diode or the like as a light source, and a liquid crystal display device using the backlight unit. Background technique [0002] In the backlight of transmissive or transflective liquid crystal display devices, cold cathode fluorescent tubes are mainly used as light sources. Since the cold cathode fluorescent tube requires a dedicated light emitting circuit and needs to apply a high voltage, it has been proposed to use a light emitting diode instead of the cold cathode fluorescent tube. [0003] As backlights using LEDs as light sources, there are known types as follows: a type in which white light is obtained using white LEDs; Blue light to obtain the type of white light. The type that uses white LEDs to obtain white light is especially suitable for use in smaller devic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1335G02B5/02G02F1/1333
CPCG02F1/133611G02B6/0068G02F1/133609G02B6/0073G02F1/133603G02B6/0021G02B6/0055G02F1/1335
Inventor 马场正武
Owner NEC LCD TECH CORP
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