CN105336836A - Light color-variable LED structure - Google Patents

Abstract

The invention discloses an LED structure with adjustable light color, which is composed of a blue LED chip and a yellow phosphor film, wherein a plurality of blue LED chips are arranged and fixed on a COB substrate to form an LED array, and the yellow fluorescent film is pasted on the LED chip. The yellow phosphor film has a periodic structure, and the yellow phosphor films corresponding to different blue LED chips have different thicknesses. Blue LED chips are alternately divided into two groups, A and B. The fluorescent powder on the fluorescent film corresponding to group A is thinner or has a lower density, and the fluorescent powder on the fluorescent film corresponding to group B is thicker or higher in density. The color temperature of the light in group B is higher, and the color temperature corresponding to the light in group B is lower. A and B are driven independently, and when the luminous intensity ratios of A and B groups are different, the overall light color of the LED changes, and the LED light color can be adjusted by controlling the driving ratio of the A and B two groups of chips.

Description

A light color variable LED structure

technical field

The invention relates to an LED packaging structure, in particular to an LED structure with variable light color.

Background technique

With the increasingly urgent demand for energy saving and emission reduction, the continuous development of LED technology and the continuous improvement of light efficiency, LED lighting has been more and more widely used, and the trend of replacing traditional incandescent lamps and fluorescent lamps is becoming more and more obvious. People's requirements for LED lamps are getting higher and higher, from simple replacement of traditional lamps to on-demand lighting, scene lighting, and secondary energy saving, which puts forward requirements for LED lamps with variable light color. There are many ways to realize variable light color LED.

Existing methods such as mixed lighting of cold and warm two-color LEDs in proportion, RGB three-color LED lighting, mixed lighting of white light and narrow-spectrum LEDs, etc. But basically, multiple LED lamp beads are required to be configured in one LED lamp. It does not match the needs of COB packaging and high-power LEDs.

Contents of the invention

The purpose of the present invention is to provide an LED structure with adjustable light color, which can match the COB packaging and high power requirements, and realize high-power LED chips with precisely adjustable light color.

Technical scheme of the present invention is:

A light-color-variable LED structure consisting of blue LED chips and yellow phosphor film, in which multiple blue LED chips are arranged and fixed on the COB substrate to form an LED array, which can be alternately divided into multiple groups, and the yellow phosphor film is pasted on the LED chip,

It is characterized in that the yellow fluorescent films on the multiple groups of blue LED chips are different.

Further, the yellow phosphor film has a periodic geometric structure, and the thickness of the yellow phosphor film is different at positions corresponding to different groups of blue LED chips.

Further, the yellow phosphor film has a periodic phosphor density distribution, and the density of the yellow phosphor film is different at positions corresponding to different groups of blue LED chips.

Further, the multiple sets of blue LED chips include 2 or 3 sets.

Further, the multiple groups of blue LED chips have their own independent driving signals, and the multiple driving signals can be adjusted individually.

The beneficial effects of the present invention are:

1. The present invention realizes the adjustable light color of the same high-power LED lamp bead through the periodic structure of the fluorescent film, and simplifies the structure and driving requirements of the LED lamp.

2. The present invention can improve the reliability and easy maintenance of the lamp by reducing the components of the LED lamp.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and embodiment:

Fig. 1 is a kind of structural representation of the present invention;

In the figure: 1, substrate; 201, group A blue LED chip; 202, group B blue LED chip; 3, yellow phosphor film.

Fig. 2 is another kind of structural representation of the present invention;

In the figure: 1, substrate; 201, group A blue LED chip; 202, group B blue LED chip; 3, yellow phosphor film.

detailed description

The present invention will be further described below in conjunction with accompanying drawing.

The working principle of the present invention is:

In the present invention, the blue LED chip array is arranged on the COB substrate, and the chips are alternately divided into two groups, A and B. The fluorescent powder on the fluorescent film corresponding to group A is thinner or has a lower density, and the fluorescent powder on the fluorescent film corresponding to group B is thinner. If it is thicker or denser, the color temperature corresponding to the light emitted by group A is higher, and the color temperature corresponding to the light emitted by group B is lower. A and B are independently driven, and when the luminous intensity ratios of A and B groups are different, the overall light color of the LED will change. Controlling the driving ratio of the A and B groups of chips can realize the adjustable LED light color.

As shown in Figure 1, the light-color-variable LED structure of the present invention is composed of a COB substrate (1), blue LED chips (201, 202) and a yellow phosphor film (3), in which a plurality of blue LED chips (201 , 202) arranged and fixed on the COB substrate (1) to form an array of LED chips, which can be alternately divided into two groups. The yellow phosphor film (3) is pasted on the LED chip array, and the yellow phosphor film has a periodic geometric structure. , wherein the yellow phosphor film has a thicker thickness at the positions corresponding to one group of blue LED chips (201), and a thinner thickness at the positions corresponding to the other group of blue LED chips (202). Because the ratio of the yellow light phosphor corresponding to the two groups of LEDs is different, the color temperature of the white light output by the two groups of chips is different, forming a cool color light and a warm color light group. Two groups of blue LED arrays have their own independent driving signals, and the two driving signals can be adjusted separately. When the driving strength of the two groups of LEDs of A and B is changed, different driving effects can be formed, and different light output ratios of the two color temperatures can be obtained, thereby obtaining LEDs with adjustable light color.

As shown in Figure 2, the COB color-tunable LED of the present invention is composed of a substrate (1), blue LED chips (201, 202) and a yellow phosphor film (3), wherein a plurality of blue LED chips (201, 202) 202) arranged and fixed on the COB substrate (1) to form an LED array, which can be alternately divided into two groups. The yellow phosphor film (3) is pasted on the LED chip array. The yellow phosphor film has a periodic concentration distribution. The yellow phosphor film has a higher concentration at the positions corresponding to one group of blue LED chips (201), and a lower concentration at the positions corresponding to the other group of blue LED chips (202). Because the two groups of LEDs correspond to different concentrations of yellow light phosphors, the color temperature of the white light output by the two groups of chips is different, forming a cool color light group and a warm color light group. Two groups of blue LED arrays have their own independent driving signals, and the two driving signals can be adjusted separately. When the driving strength of the two groups of LEDs of A and B is changed, different driving effects can be formed, and different light output ratios of the two color temperatures can be obtained, thereby obtaining LEDs with adjustable light color.

Claims (5)

1. a light color variable LED structure, is made up of blue-light LED chip and yellow fluorescent powder film, and wherein many blue-light LED chip arrangements are fixed on COB substrate and form LED array, and alternately can be divided into many groups, and yellow fluorescence film is covered on LED chip,

Its feature in: the yellow fluorescence film on described many group blue-light LED chips is different.

2. light color variable LED structure as claimed in claim 1, is characterized in that: described yellow fluorescent powder film has periodically geometry, and the thickness of yellow fluorescent powder film wherein on the position that difference group blue-light LED chip is corresponding is different.

3. light color variable LED structure as claimed in claim 1, is characterized in that: described yellow fluorescent powder film has periodically phosphor's density distribution, and the density of yellow fluorescent powder film wherein on the position that difference group blue-light LED chip is corresponding is different.

4. the light color variable LED structure as described in one of claim 1-3, is characterized in that: described many group blue-light LED chips comprise 2 groups or 3 groups.

5. the light color variable LED structure as described in one of claim 1-3, is characterized in that: organize blue-light LED chip described more, and have separately independently drive singal, multi-channel drive signal can each self-regulation.