CN101737721A

CN101737721A - Surface light source

Info

Publication number: CN101737721A
Application number: CN200810232251A
Authority: CN
Inventors: 高戈
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-11-13
Filing date: 2008-11-13
Publication date: 2010-06-16

Abstract

The invention relates to a surface light source, particularly to a surface light source which is provided with a shell coated or manufactured with fluorescent powder and excites the fluorescent powder to illuminate by using a light emitting diode (LED). The surface light source is characterized in that a shell made from transparent media is coated (or manufactured) with the fluorescent powder, and the fluorescent powder coated on the shell can illuminate by being excited with light emitted by one or a plurality of LED chips (which can be installed on the side of the shell as well). The shape of the shell, the illuminating color of the fluorescent powder, figures thereof, and the like can be manufactured as required.

Description

Area source

Under technical field: the present invention relates to a kind of novel area source, particularly a kind of that have a shell and apply or made fluorescent material thereon and with the luminous area source of LED excitated fluorescent powder.

Background technology: LED is the abbreviation of English light emitting diode (light emitting diode), it is an electroluminescent semiconductor chip, the wafer that the core is made up of p type semiconductor and n type semiconductor, between p type semiconductor and n type semiconductor, a transition zone is arranged, be called p-n junction.In the p-n junction of some semi-conducting material, the minority carrier of injection and majority carrier compound tense can discharge the form of unnecessary energy with light, thereby electric energy directly is converted to luminous energy.The P-n knot adds backward voltage, and minority carrier is difficult to inject, so not luminous.This diode that utilizes the making of injection electroluminescence principle is generally called LED light emitting diode.When it is in the forward duty (two ends add forward voltage), when electric current flowed to negative electrode from the LED anode, semiconductor wafer just sent the light from ultraviolet to infrared different colours, the power of light and current related.

Existing led light source is one or more led chips to be encapsulated combine.Some led chips can only send the monochromatic light of certain color, if the light of other color will be arranged, will be at the chip surface coating fluorescent powder etc., and on the chip of blue light-emitting, apply yellow fluorescent powder and obtain as white light.Its shortcoming is: because each unit LEDs chip is the square of 0.3-0.5mm, and light all sends at P-n joint place, therefore, the light that each led chip sends is spot light basically, promptly use a plurality of led light sources to be assembled into area source, also always see fragmentarily, the area source on the practical significance can not be provided, and color is abundant inadequately, lacks some sights and ornamental.

Summary of the invention: task of the present invention provides a kind of LED of utilization technology and realizes the luminous area source of face.

The present invention finishes as follows: medium that a pair of natural daylight is transparent such as glass etc. are made the shell (plane, sphere shape, compound curved surface shape etc.) of required form, the fluorescent material of a surface applied therein (or make) different colours (white, three primary colours), difformity, different structure (with fluorescent powder coated or be made into point-like, strip, other figure) (rather than resemble existing with fluorescent powder coated on the led chip surface).Suitable position or side are installed the led chip of or several blue outside lines other light such as (or) blue lights near shell.The ultraviolet ray of sending when led chip other light such as (or) blue lights is when being radiated on the shell, fluorescent material on the shell will be excited luminous, just can obtain to have the area source of different profiles, color, pattern, brightness, will carry out corresponding ultraviolet ray simultaneously and reveal protection etc.

The invention has the beneficial effects as follows: it can utilize this luminescence technology of LED to obtain area source continuous rather than fragmentarily, satisfy area source demand to difformity, pattern, color, brightness, and because of LED the strongest luminous direction becomes very little angle with the light-emitting phosphor face, this just can make thinner that area source does.This area source can be used as LCD (liquid crystal) backlight, study illuminating lamp, ornament lamp etc.The existing LCD backlight of making of LED has two kinds of straight-down negative and photometry formulas.According to correlation theory, in the straight-down negative mode, led chip spacing and light source thickness are inversely proportional to, thickness will approach spacing will be little, will use more LED to obtain uniform surface light source, cost is bigger, obtains among the LCD widely applying so present LED-backlit source is difficult in.In Exposure Metering, because its cost than CCFL mode backlight height, therefore also is difficult to use.The present invention utilizes LED luminous efficiency height exactly, and in conjunction with specific structure, produces the area source that needs.

Description of drawings:

Accompanying drawing is a schematic diagram of the present invention.1. shell, 2. fluorescent material.3.LED chip, 4. reflector (or reflective membrane).

The present invention is further described below in conjunction with accompanying drawing and implementation column.

Area source of the present invention is like this work: the ultraviolet ray that led chip 3 is launched other light such as (or) blue lights direct projection or through reflecting plate 4 reflections impinge upon on the fluorescent material 2 (or when led chip is installed in the side of shell, by direct projection or reflection in the transparent medium shell light is radiated on the fluorescent material), fluorescent material 2 is excited luminous, part light transmission shell and outwards send visible light, also some returns inner surface of outer cover through baffle reflection, and it is outwards luminous to see through shell then.When the enough height of luminous efficiency of chip LED 3 or quantity is abundant or light-emitting phosphor efficient when enough high, just can obtain needed area source.Shell 1 is the shell that glass or other transparent material are made, can be the plane, sphere, compound curved surface, and several are spliced.As required, led chip 3 can be several led chips, and in the enclosure diverse location or side are installed).

Claims

1. novel area source is characterized in that a kind of that have a shell and apply or made fluorescent material and with the luminous area source of LED excitated fluorescent powder thereon.(rather than resemble existing with fluorescent powder coated at the lip-deep led light source of led chip).

2. by the area source of claim 1 regulation, the formed area of the direct luminescent fluorescent powder of optical excitation fluorescent material that it is characterized in that being sent by led chip is greater than 99mm ²

3. by the area source of claim 1 regulation, it is characterized in that can be as required, and shell can be made into different shape (plane, sphere shape, compound curved surface shape etc.); The light-emitting phosphor color of coated (or make), shape, structure (will fluorescent powder coated or be made into point-like, strip, other figure) also can need making by asking.