Double-color COB package

Abstract

A double-color COB package comprises a substrate and an LED chip, a cofferdam is arranged on the substrate, a functional area is formed in the cofferdam, the LED chip is arranged in the functional area, the LED chip comprises a first blue light chip and a second blue light chip, the cofferdam is filled with light blocking white glue, the light blocking white glue covers the side faces of the first blue light chip and the second blue light chip, and the first blue light chip and the second blue light chip are arranged in the cofferdam. The light-emitting surface of the top surface of the first blue light chip is covered with warm white fluorescent glue, and the light-emitting surface of the top surface of the second blue light chip is covered with cold white fluorescent glue. According to the principle of the utility model, the bottom surface of the COB and the four side surfaces of the chip are filled with the light-blocking white glue, so that the four side surfaces of the chip are blocked from emitting light, only the top surface of the chip is left to emit light, and the reflectivity of the bottom surface of the COB is increased at the same time; lED chips are uniformly divided into two groups, warm white fluorescent glue is dispensed on the top surface of one group of chips, and cold white fluorescent glue is dispensed on the top surface of the other group of chips, so that monochromatic light debugging is not influenced by the other group of monochromatic light, debugging is simpler, and operation is easier.

Description

Technical Field

[0001] The utility model relates to the technical field of LEDs, in particular to a double-color COB package. Background Art

[0002] Two-color COB light sources are usually packaged using two types of fluorescent glue. For example, a two-color COB packaging method with Chinese patent publication number CN112490341B includes the following steps: (1) solidifying the crystal on the substrate, and the LED chip on the substrate is divided into a first LED chip and a second LED chip; (2) making a cofferdam on the substrate to enclose the LED chip; (3) fixing a water-soluble sheet on the top light-emitting surface of the second LED chip; (4) filling the first fluorescent colloid within the cofferdam range, the first fluorescent colloid completely covers the first LED chip, and the top surface of the first fluorescent colloid is flush with the top surface of the water-soluble sheet; (5) washing the water-soluble sheet with water, and forming a groove on the top of the second LED chip after the water-soluble sheet is dissolved; (6) filling the second fluorescent colloid in the groove, and the top surface of the second fluorescent colloid is flush with the top surface of the first fluorescent colloid. The packaging process of this kind of two-color COB is complicated. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a double-color COB package with simple packaging process and simple debugging.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a two-color COB package, including a substrate and an LED chip, a cofferdam is provided on the substrate, a functional area is formed in the cofferdam, the LED chip is arranged in the functional area, the LED chip includes a first blue light chip and a second blue light chip, the cofferdam is filled with light-blocking white glue, the light-blocking white glue covers the sides of the first blue light chip and the second blue light chip, the top light-emitting surface of the first blue light chip is covered with warm white fluorescent glue, and the top light-emitting surface of the second blue light chip is covered with cold white fluorescent glue. Principle of the utility model: fill the bottom surface of COB and the four sides of the chip by filling the light-blocking white glue, block the light emission of the four sides of the chip, leave only the top surface of the chip to emit light, and increase the reflectivity of the bottom surface of COB at the same time; divide the LED chips evenly into two groups, one group of chips has warm white fluorescent glue on the top surface, and the other group of chips has cold white fluorescent glue on the top surface. This packaging method makes the debugging of monochromatic light not affected by another monochromatic light, and the debugging is simpler and easier to operate.

[0005] As an improvement, several rows of LED groups are arranged in the functional area, each LED group includes several first blue light chips and second blue light chips arranged symmetrically; the first blue light chips and second blue light chips of adjacent LED groups are staggered.

[0006] As an improvement, the warm white fluorescent glue and the cold white fluorescent glue are formed by a dispensing process, and the tops of the warm white fluorescent glue and the cold white fluorescent glue are arc-shaped.

[0007] Compared with the prior art, the utility model has the following beneficial effects:

[0008] By filling the COB bottom surface and the four sides of the chip with light-blocking white glue, the light from the four sides of the chip is blocked, leaving only the top surface of the chip to emit light, while increasing the reflectivity of the COB bottom surface; the LED chips are evenly divided into two groups, one group of chips has warm white fluorescent glue on the top surface, and the other group of chips has cold white fluorescent glue on the top surface. This packaging method ensures that the debugging of monochromatic light will not be affected by another monochromatic light, making debugging simpler and easier to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a top view of the utility model.

[0010] Figure 2 It is a cross-sectional view of the utility model. Implementation

[0011] The utility model will be further described below in conjunction with the accompanying drawings.

[0012] like Figure 1 , 2 As shown, a two-color COB package includes a substrate and an LED chip. A cofferdam 7 is provided on the substrate 3, and a functional area 4 is formed in the cofferdam 7. The LED chip is arranged in the functional area 4. The LED chip includes a first blue light chip 1 and a second blue light chip 2, and the number of the first blue light chip 1 and the second blue light chip 2 is the same; a plurality of rows of LED groups are arranged in the functional area 4, and each LED group includes a plurality of first blue light chips 1 and second blue light chips 2 that are symmetrically arranged on the left and right. The first blue light chips 1 and the second blue light chips 2 of adjacent groups of LED groups are staggered, and the LED chips of this layout have more uniform light mixing. The cofferdam 7 is filled with light-blocking white glue 8, and the top surface of the light-blocking white glue 8 is flush with the top surface of the blue light chip. The light-blocking white glue 8 covers the four sides of the first blue light chip 1 and the second blue light chip 2, and only the top light-emitting surface of the first blue light chip 1 and the second blue light chip 2 is exposed. The top light-emitting surface of the first blue light chip 1 is covered with warm white fluorescent glue 5, and the first blue light chip 1 excites the warm white fluorescent glue 5 to emit warm white light. The top light-emitting surface of the second blue light chip 2 is covered with cold white fluorescent glue 6, and the second blue light chip 2 excites the cold white fluorescent glue 6 to emit cold white light. The warm white fluorescent glue 5 and the cold white fluorescent glue 6 are formed by a dispensing process, and the tops of the warm white fluorescent glue 5 and the cold white fluorescent glue 6 are arc-shaped. A transparent glue layer 9 is provided inside the cofferdam 5 and on the top surface of the light-blocking white glue, and the transparent glue layer 9 covers the light-blocking white glue, the warm white fluorescent glue and the cold white fluorescent glue.

[0013] The principle of the utility model is as follows: the bottom surface of the COB and the four sides of the chip are filled with light-blocking white glue 8, the light from the four sides of the chip is blocked, only the top surface of the chip is left to emit light, and the reflectivity of the bottom surface of the COB is increased; the LED chips are evenly divided into two groups, the top surface of one group of chips is dotted with warm white fluorescent glue 5, and the top surface of the other group of chips is dotted with cold white fluorescent glue 6. This packaging method ensures that the debugging of monochromatic light will not be affected by another monochromatic light, and the debugging is simpler and easier to operate.

Claims

1. A two-color COB package, comprising a substrate and an LED chip, wherein a cofferdam is provided on the substrate, a functional area is formed in the cofferdam, and the LED chip is arranged in the functional area, characterized in that: The LED chip includes a first blue light chip and a second blue light chip. The cofferdam is filled with light-blocking white glue, and the light-blocking white glue covers the sides of the first blue light chip and the second blue light chip. The top light-emitting surface of the first blue light chip is covered with warm white fluorescent glue, and the top light-emitting surface of the second blue light chip is covered with cold white fluorescent glue.

2. A two-color COB package according to claim 1, characterized in that: A plurality of rows of LED groups are arranged in the functional area, each LED group includes a plurality of first blue light chips and second blue light chips that are symmetrically arranged on the left and right; the first blue light chips and the second blue light chips of adjacent LED groups are staggered.

3. A two-color COB package according to claim 1, characterized in that: The warm white fluorescent glue and the cold white fluorescent glue are formed by a dispensing process, and the tops of the warm white fluorescent glue and the cold white fluorescent glue are arc-shaped.

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