White light emitting device

a light-emitting device and white light technology, applied in the direction of discharge tube luminescnet screens, discharge tube/lamp details, electric discharge lamps, etc., can solve the problems of mediocre color reproducibility, high power consumption and low efficiency, and achieve superior color reproducibility and high efficiency.

Inactive Publication Date: 2007-07-12
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]The present invention has been made to solve the foregoing problems of the prior art and therefore an object of certain embodiments of the present invention is to provide a high-quality white light emitting device having high efficiency and superior color reproducibility.

Problems solved by technology

Such a white LED apparatus has advantages like relatively high efficiency and low costs but also drawbacks like mediocre color reproducibility.
Therefore, such a white light emitting device does not well express the green and red regions, thus having a mediocre color rendering index and color reproducibility.
Such white LED apparatuses have relatively good color reproducibility but with high power consumption and low efficiency.
Moreover, these white LED apparatuses are not cost-effective with complex circuit configurations.
Such a white light emitting device has superior color reproducibility with low costs, but is not yet commonly used and has low efficiency.

Method used

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Embodiment Construction

[0030]Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The invention may however be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the shapes and dimensions may be exaggerated for clarity, and the same reference numerals are used throughout to designate the same or like parts.

[0031]FIG. 3 is a schematic sectional view illustrating a white light emitting device according to an embodiment of the present invention. Referring to FIG. 3, the white light emitting device 100 includes a blue / green LED 101 and a red LED 102 mounted in a cup-shaped reflecting recess 110 of a package and yellow phosphor 103. The blue / green LED 101 is a single chip emitting both blue wavelen...

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Abstract

A white light emitting device includes a structure for emitting white light having at least four wavelengths by using two or less LEDs, where the LEDs include a blue/green LED emitting blue and green wavelengths of light. The device also includes means for emitting red wavelength of light.

Description

CLAIM OF PRIORITY[0001]This application claims the benefit of Korean Patent Application No. 2005-130652 filed on Dec. 27, 2005, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a white light emitting device, and more particularly, to a white light emitting device using up to two LEDs to achieve superior color reproducibility and high efficiency.[0004]2. Description of the Related Art[0005]In general, a white LED apparatus is preferred over a conventional small-sized lamp or a fluorescent lamp as a backlight of a Liquid Crystal Display (LCD). The white LED apparatus can be manufactured by forming a ceramic phosphor layer on a light exiting surface of a blue LED.[0006]The most representative type of conventional white LED apparatus is realized by combining a GaN-based blue LED with YAG-based yellow phosphor. The blue light emitted from...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01J1/62H01L33/32H01L33/50H01L33/56H01L33/62
CPCH01L33/50H01L25/0753H01L2924/0002
Inventor CHOI, PUN JAEKOIKE, MASAYOSHISONG, SANG YEOB
Owner SAMSUNG ELECTRONICS CO LTD
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