CN102155673A - LED (Light Emitting Diode) backlight source - Google Patents
LED (Light Emitting Diode) backlight source Download PDFInfo
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- CN102155673A CN102155673A CN2010105858928A CN201010585892A CN102155673A CN 102155673 A CN102155673 A CN 102155673A CN 2010105858928 A CN2010105858928 A CN 2010105858928A CN 201010585892 A CN201010585892 A CN 201010585892A CN 102155673 A CN102155673 A CN 102155673A
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Abstract
The invention provides an LED (Light Emitting Diode) backlight source. A chip excites at least two fluorescent substances to emit light; a produced light spectrum at least comprises a green fluorescence peak and a red fluorescence peak; and different light emitting effects can be obtained by regulating the intensities of two fluorescence peaks. Compared with the conventional LED backlight source, the LED backlight source has the advantages that: blue, green and red light spectrums are separated from one another, so that the light emitting color gamut of the LED backlight source is widened, the color purity is higher, favorable color gamut coverage and color reducing property are achieved, the color performances of bright red and dark green are further enhanced so that the red color and the green color become bright, and more vivid color than that of the conventional LED backlight source is shown.
Description
Technical field
The present invention relates to a kind of LCD backlight source, particularly a kind of LED-backlit source.
Background technology
At present, the market demand of liquid crystal indicator is the strong growth impetus, and along with the increase of liquid crystal indicator size, LCD backlight source influence to image quality in device is also more and more higher.And the LED-backlit source technology is as one of the main flow trend of high image quality technical development in the liquid crystal indicator, because its high color saturation and enough wide colour gamut, remedied the defective of liquid crystal display display color lazy weight; In addition, because the LED-backlit source does not contain Toxic matter mercury, environmental protection, and good mechanical shock stability, advantages such as luminescent lifetime length, thus win increasing concern.
Wherein, splendid colour gamut shows it is one of the most noticeable advantage of LED-backlit source, usually the LED-backlit source images shows that signal adopts the different color of mixed proportion definition of Red Green Blue, human eye is then distinguished the ratio of red, green, blue three looks by brightness, tone and the saturation degree of aware colors, and the relation of tone and saturation degree and red, green, blue is non-linear.Shown in Figure 1, be existing traditional LED-backlit source spectrogram, adopt yellow fluorescent powder to be added on the blue-ray LED, its excitation spectrum has two crests, and one at blue wave band, another is from the green glow to the red spectral band, be a kind of mixing peak, use color filter to the color filtering that this wave band is fit to each look lattice needs, it can waste most optical energy, consequence is to make the chromatogram of passing after the filtration unsatisfactory, so Color Management Technology is comparatively difficult.Simultaneously, adopt this kind LED-backlit source technology,, cause the not enough natural reality of image frame of demonstration owing to can't show more chromatic colour of BELAND, green, red three primary colors.
Therefore, need a kind of new LED backlight, it does not need color filter, can access bright-coloured indigo plant, green, red three primary colors, to strengthen scarlet and dark green color representation, makes redness and green become vivid more gorgeous brilliant.
Summary of the invention
The invention provides a kind of LED-backlit source, excite at least two kinds of fluorescent materials and luminous by chip, the spectrum that is produced comprises green fluorescence peak and red fluorescence peak at least, and can obtain different illumination effects by the intensity of regulating two fluorescence peaks.
Wherein, described at least two kinds of fluorescent materials can comprise the mixture of two kinds and two or more fluorescent material, or two-layer or two-layer above phosphor layer.
The present invention also provides a kind of LED, it is characterized in that described LED comprises: the semiconductor light emitting chip; Base is made by Heat Conduction Material, is used to carry described semiconductor light emitting chip; Positive pole and negative pole are used to import electric current; And at least two kinds of fluorescent materials.
Compare with existing LED-backlit source spectrum, because after adopting blue-light LED chip to add red, green fluorescence powder respectively, layering excites different-waveband spectrum, compare with existing LED-backlit source, do not need color filter, can access bright-coloured indigo plant, green, red three primary colors, strengthen scarlet and dark green color representation, cause redness and green to become vivid more gorgeous brilliant.
Description of drawings
For the features and advantages of the present invention are become apparent, describe in detail below in conjunction with accompanying drawing, wherein
Fig. 1 is the spectrogram in present LED-backlit source;
Fig. 2 is the spectrogram in LED-backlit source according to an embodiment of the invention;
Fig. 3 is the spectrogram of positive according to an embodiment of the invention white LEDs backlight.
Fig. 4 is the structural representation that adopts the LED in LED-backlit of the present invention source.
The specific embodiment
Below by drawings and Examples, technical scheme of the present invention is done detailed description.
As shown in Figure 4, adopt the LED in LED-backlit of the present invention source to comprise: semiconductor light emitting chip 1; Base 2 is made by Heat Conduction Material, is used to carry described semiconductor light emitting chip; Positive pole 4 and negative pole 5 are used to import electric current; And at least two kinds of fluorescent materials 3.
In the preparation in LED-backlit source, at first, the blue chip of different-waveband is placed on the heat radiation ceramic base, on chip, be coated with redness and green phosphor layer then respectively, can excite by red, green, blue three former groups of primaries behind the connection electrode and close the white light of the different-colour section that forms with different proportionings.Because different phosphor powder layers are to the influence of the every index of spectrum, when being coated with fluorescent material proportioning was suitable, the layering by blue chip excited, and encapsulation back LED-backlit source institute luminous spectrum has wherein comprised blue, green and red three fluorescence peaks as shown in Figure 2.Because the interpolation of red fluorescent material, cause the red fluorescence peak to manifest, broken the mixing wave band of traditional LED-backlit source spectrum from the green to the redness, green and red fluorescence peak are manifested respectively, strengthened scarlet and dark green performance, thereby made the LED-backlit source show color more true to nature.
Wherein, be example with positive white LEDs backlight, adopt the chip of the brilliant first EDI-1270 of 455nm～457.5nm, the fluorescent material that is coated with is made up of the green phosphor layer of Ying Temei R6733 red fluorescence bisque and G2762.Behind the some ground floor fluorescent glue, make spectrum red ratio index account for 40～50%; Behind the some second layer fluorescent glue, make green fluorescence peak and blue-fluorescence peak contour.Finished product led light source spectrum is done as shown in Figure 3 by institute, and blue, green and red trichromatic spectrum is separated from each other, and spectrum proportion difference of all kinds.
The above is one of embodiment, studies show that, adopt the chip of different-waveband size model, proportioning and component by the appropriate regulation phosphor powder layer, can regulate blueness, redness and green fluorescence peak ratio respectively, and then obtain desirable light source effect, there is very big difference as Fig. 2 and redness and green spectral proportion shown in Figure 3.Make the LED-backlit source show that simultaneously Red is not limited to said chip and fluorescent material, and relevant proportioning data.
The LED-backlit source of method for preparing excites at least two kinds of fluorescent materials and luminous by chip, and the spectrum that is produced comprises green fluorescence peak and red fluorescence peak at least, and can obtain different illumination effects by the intensity of regulating two fluorescence peaks.
Wherein, described at least two kinds of fluorescent materials can comprise the mixture of two kinds and two or more fluorescent material, or two-layer or two-layer above phosphor layer.By the adjusting to fluorescent material, in two fluorescence peaks of green that requirement is sent and redness, the scope at red fluorescence peak to 690nm, wherein arrives the red fluorescence peak best results of 660nm at 580nm especially with 600nm; The scope at green fluorescence peak to 580nm, wherein arrives the green fluorescence peak best results of 560nm at 490nm especially with 510nm.And two peak ratio can be in 1 to 20 to 20 to 1 scope, and with 1 to 2 to 2 to 1 spectrum peak ratio best results.
It should be noted last that; above embodiment is only unrestricted in order to technical scheme of the present invention to be described; although the present invention is had been described in detail with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can make amendment or be equal to replacement technical scheme of the present invention; and do not break away from the spirit and scope of technical solution of the present invention, therefore, protection scope of the present invention is as the criterion when defining with claims.
Claims (10)
1. a LED-backlit source excites at least two kinds of fluorescent materials and luminous by chip, and the spectrum that is produced comprises green fluorescence peak and red fluorescence peak at least, and can obtain different illumination effects by the intensity of regulating two fluorescence peaks.
2. LED-backlit as claimed in claim 1 source is characterized in that described at least two kinds of fluorescent materials are the mixtures that comprise two or more fluorescent material.
3. LED-backlit as claimed in claim 1 source is characterized in that described at least two kinds of fluorescent materials comprise two-layer or two-layer above phosphor layer.
4. LED-backlit as claimed in claim 1 source is characterized in that described at least two kinds of fluorescent materials are two kinds of fluorescent material.
5. LED-backlit as claimed in claim 1 source is characterized in that described at least two kinds of fluorescent materials are the mixtures that comprise two kinds of fluorescent materials, and the scope at wherein said red fluorescence peak arrives 690nm at 580nm.
6. LED-backlit as claimed in claim 1 source is characterized in that used at least two kinds of fluorescent materials are the mixtures that comprise two kinds of fluorescent material, and the scope at wherein said green fluorescence peak arrives 580nm at 490nm.
7. LED-backlit as claimed in claim 1 source, it is characterized in that used at least two kinds of fluorescent materials are mixtures of red fluorescent material and green fluorescence material, the scope at wherein said green fluorescence peak is 510nm to 560nm, and the scope of described red fluorescent material fluorescence peak is 630nm to 670nm.
8. LED-backlit as claimed in claim 1 source, the ratio that it is characterized in that described green fluorescence peak and described red fluorescence peak is in 1 to 20 to 20 to 1 scope.
9. LED-backlit as claimed in claim 8 source, the ratio that it is characterized in that described green fluorescence peak and described red fluorescence peak is in 1 to 2 to 2 to 1 scope.
10. as each described LED-backlit source among the claim 1-9, be used for display backlight or projector light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105858928A CN102155673A (en) | 2010-12-14 | 2010-12-14 | LED (Light Emitting Diode) backlight source |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105858928A CN102155673A (en) | 2010-12-14 | 2010-12-14 | LED (Light Emitting Diode) backlight source |
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| CN102155673A true CN102155673A (en) | 2011-08-17 |
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| CN2010105858928A Pending CN102155673A (en) | 2010-12-14 | 2010-12-14 | LED (Light Emitting Diode) backlight source |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1388594A (en) * | 2001-05-27 | 2003-01-01 | 华刚光电(深圳)有限公司 | Light-emitting semiconductor device containing fluorophor and its application |
| CN1691328A (en) * | 2004-04-28 | 2005-11-02 | 宏齐科技股份有限公司 | White light LED assembly and making method thereof |
| CN101252159A (en) * | 2007-02-20 | 2008-08-27 | 三星电机株式会社 | White luminous device |
| CN101405646A (en) * | 2006-03-17 | 2009-04-08 | 飞利浦拉米尔德斯照明设备有限责任公司 | White LED for backlight with phosphor plates |
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2010
- 2010-12-14 CN CN2010105858928A patent/CN102155673A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1388594A (en) * | 2001-05-27 | 2003-01-01 | 华刚光电(深圳)有限公司 | Light-emitting semiconductor device containing fluorophor and its application |
| CN1691328A (en) * | 2004-04-28 | 2005-11-02 | 宏齐科技股份有限公司 | White light LED assembly and making method thereof |
| CN101405646A (en) * | 2006-03-17 | 2009-04-08 | 飞利浦拉米尔德斯照明设备有限责任公司 | White LED for backlight with phosphor plates |
| CN101252159A (en) * | 2007-02-20 | 2008-08-27 | 三星电机株式会社 | White luminous device |
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Application publication date: 20110817 |