External die bonding type double color COB changing along color temperature black body curve

Abstract

The utility model relates to COB light source technical field, specifically disclose a kind of along chromaticity temperature blackbody curve change's external die bonding type bicolor COB, including substrate, positive pad, warm light chip group, cold light chip group and negative pad are arranged on the substrate, the warm light chip group and cold light chip group are electrically connected with the positive pad and negative pad respectively, the substrate is provided with light emitting area, the warm light chip group and cold light chip group are located in light emitting area, fixed crystal gap is set in the edge of light emitting area, constant current device is arranged in the fixed crystal gap, a plurality of green light chip in series with the constant current device is arranged in the light emitting area, and the constant current device and green light chip are connected with the positive pad and negative pad respectively.The light color coordinate mixed out by the utility model can be located on blackbody curve, so that the value of chromaticity temperature coordinate can be changed along chromaticity temperature blackbody curve when adjusting color temperature, meet the user's demand.

Description

Technical Field

[0001] This utility model relates to the field of COB light source technology, and in particular to an external die-bonded dual-color COB that varies along the color temperature blackbody curve. Background Technology

[0002] COB (Chip on Board) refers to chip-on-board packaging. COB light sources typically include a substrate, on which are provided light-emitting areas, cold light positive electrode pads, cold light negative electrode pads, warm light positive electrode pads, warm light negative electrode pads, and conductive lines. COB light sources are widely used due to their long lifespan, lack of pollution, and high luminous efficiency.

[0003] Current dimming LED devices require a five-channel scheme to achieve two color temperature variations and adjust the color coordinates along the blackbody curve. The five channels are a red light channel, a green light channel, a blue light channel, and two white light channels. The functions of red, green, and blue light are as follows: green light is added when the color coordinate value needs to be increased; red light is added when the color coordinate value is too high and needs to be decreased; and blue light is used to control the color temperature.

[0004] In practical applications, the demand for adjustable color temperature for the same white light luminaire is becoming increasingly common. Existing technologies achieve adjustable color temperature for the same luminaire through light mixing methods, such as mixing cool and warm white light to produce white light with adjustable color temperature. However, this warm and cool white light mixing method suffers from the drawback of the resulting color coordinates deviating significantly from the blackbody curve. This makes it difficult to ensure that the color temperature coordinates change along the blackbody curve when adjusting the color temperature, thus failing to meet user needs. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide an external die-bonded dual-color COB that varies along the color temperature blackbody curve, in view of the above-mentioned defects of the prior art. By opening a die-bonding notch in the light-emitting area and adding a constant current device in the die-bonding notch, a constant current effect is achieved. The color coordinates of the mixed light can be located on the blackbody curve, so that when adjusting the color temperature, the value of the color temperature coordinates can vary along the color temperature blackbody curve, thus meeting the user's needs.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0007] An external die-bonded dual-color COB that varies along a blackbody color temperature curve includes a substrate. The substrate has a positive electrode pad, a warm light chip group, a cold light chip group, and a negative electrode pad. The warm light chip group and the cold light chip group are electrically connected to the positive electrode pad and the negative electrode pad, respectively. A light-emitting region is provided on the substrate, and the warm light chip group and the cold light chip group are both located within the light-emitting region. A die-bonding notch is formed at the edge of the light-emitting region, and a constant current device is disposed within the die-bonding notch. A plurality of green light chips connected in series with the constant current device are disposed within the light-emitting region, and the constant current device and the green light chips are connected to the positive electrode pad and the negative electrode pad, respectively.

[0008] Preferably, the positive electrode pad includes a warm light positive electrode pad and a cold light positive electrode pad, the negative electrode pad includes a warm light negative electrode pad and a cold light negative electrode pad, the warm light chip group is connected to the warm light positive electrode pad and the warm light negative electrode pad respectively, and the cold light chip group is connected to the cold light positive electrode pad and the cold light negative electrode pad respectively.

[0009] Preferably, the constant current device is connected to the warm light positive electrode pad and the green light chip respectively, and the green light chip is connected to the warm light negative electrode pad.

[0010] Preferably, the constant current device is connected to the cold light positive electrode pad and the green light chip respectively, and the green light chip is connected to the cold light negative electrode pad.

[0011] Preferably, the constant current device is a constant current resistor or a constant current diode.

[0012] Preferably, the warm light chip group includes a plurality of warm light chips connected in series, the cold light chip group includes a plurality of cold light chips connected in series, and the green light chip is located between the warm light chips and the cold light chips.

[0013] By adopting the above technical solution, the external die-bonded dual-color COB provided by this utility model, which varies along the color temperature blackbody curve, has the following beneficial effects: The warm light chip group and the cold light chip group in the external die-bonded dual-color COB are electrically connected to the positive and negative electrode pads, respectively. A light-emitting area is provided on the substrate, and both the warm light chip group and the cold light chip group are located within the light-emitting area. A die-bonding notch is provided at the edge of the light-emitting area, and a constant current device is provided within the die-bonding notch. Several green light chips connected in series with the constant current device are provided within the light-emitting area. The constant current device and the green light chips are connected to the positive and negative electrode pads, respectively. By providing a die-bonding notch in the light-emitting area and adding a constant current device within the die-bonding notch, a constant current effect is achieved. Furthermore, by adding green light chips within the light-emitting area, the color coordinates of the mixed light can be located on the blackbody curve. Therefore, when adjusting the color temperature, the color temperature coordinates can vary along the color temperature blackbody curve, meeting user needs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0015] In the figure, 1-substrate, 2-warm light chip group, 3-cold light chip group, 4-light emission area, 5-die bonding notch, 6-constant current device, 7-green light chip, 8-warm light positive electrode pad, 9-cold light positive electrode pad, 10-warm light negative electrode pad, 11-cold light negative electrode pad. Detailed Implementation

[0016] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0017] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0018] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0019] like Figure 1As shown, the external die-bonded dual-color COB that varies along the color temperature blackbody curve includes a substrate 1. The substrate 1 has a positive electrode pad, a warm light chip group 2, a cold light chip group 3, and a negative electrode pad. The warm light chip group 2 and the cold light chip group 3 are electrically connected to the positive and negative electrode pads, respectively. A light-emitting region 4 is provided on the substrate 1, and the warm light chip group 2 and the cold light chip group 3 are located within the light-emitting region 4. A die-bonding notch 5 is formed at the edge of the light-emitting region 4, and a constant current device 6 is disposed within the die-bonding notch 5. Several green light chips 7 connected in series with the constant current device are disposed within the light-emitting region 4. The constant current device 6 and the green light chips 7 are connected to the positive and negative electrode pads, respectively. It is understood that the substrate 1 can be a general-purpose aluminum substrate, the constant current device 6 can be a general-purpose constant current resistor or constant current diode, and the green light chips 7 can be a general-purpose green light chip; the constant current device 6 is fixed to the substrate 1 by die bonding.

[0020] Specifically, the positive electrode pad includes a warm-light positive electrode pad 8 and a cold-light positive electrode pad 9, and the negative electrode pad includes a warm-light negative electrode pad 10 and a cold-light negative electrode pad 11. The warm-light chip group 2 is connected to the warm-light positive electrode pad 8 and the warm-light negative electrode pad 10, respectively, and the cold-light chip group 3 is connected to the cold-light positive electrode pad 9 and the cold-light negative electrode pad 11, respectively. It can be understood that the warm-light chip group 2 includes a plurality of warm-light chips connected in series, the cold-light chip group 3 includes a plurality of cold-light chips connected in series, and the green light chip 7 is located between the warm-light chips and the cold-light chips.

[0021] Understandably, in Embodiment 1, the constant current device 6 is connected to the warm light positive electrode pad 8, and the green light chip 7 is connected to the warm light negative electrode pad 10. The number of constant current devices 6 can be multiple, and this invention does not limit the number.

[0022] Understandably, in Embodiment 2, the constant current device 6 is connected to the cold light positive electrode pad 9, and the green light chip 7 is connected to the cold light negative electrode pad 11. The number of constant current devices 6 can be multiple, and this invention does not limit the number.

[0023] Understandably, this utility model has a reasonable design and unique structure. It achieves a constant current effect by opening a die-bonding notch 5 in the light-emitting area 4 and adding a constant current device 6 in the die-bonding notch 5. By adding a green light chip 7 in the light-emitting area 4, the color coordinates of the mixed light can be located on the color temperature blackbody curve. Thus, when adjusting the color temperature, the value of the color temperature coordinates can change along the color temperature blackbody curve, which can meet the user's needs.

[0024] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. An external die-bonded dual-color COB that varies along a blackbody color temperature curve, comprising a substrate, wherein a positive electrode pad, a warm light chip group, a cold light chip group, and a negative electrode pad are disposed on the substrate, wherein the warm light chip group and the cold light chip group are electrically connected to the positive electrode pad and the negative electrode pad, respectively, and a light-emitting area is disposed on the substrate, wherein the warm light chip group and the cold light chip group are both located within the light-emitting area, characterized in that: A die-bonding notch is provided at the edge of the light-emitting area, and a constant current device is disposed within the die-bonding notch. Several green light chips connected in series with the constant current device are disposed within the light-emitting area, and the constant current device and the green light chips are respectively connected to the positive electrode pad and the negative electrode pad.

2. The externally mounted die-bonded dual-color COB that varies along the color temperature blackbody curve according to claim 1, characterized in that: The positive electrode pad includes a warm light positive electrode pad and a cold light positive electrode pad, and the negative electrode pad includes a warm light negative electrode pad and a cold light negative electrode pad. The warm light chip group is connected to the warm light positive electrode pad and the warm light negative electrode pad respectively, and the cold light chip group is connected to the cold light positive electrode pad and the cold light negative electrode pad respectively.

3. The externally mounted die-bonded dual-color COB that varies along the color temperature blackbody curve according to claim 2, characterized in that: The constant current device is connected to the warm light positive electrode pad and the green light chip respectively, and the green light chip is connected to the warm light negative electrode pad.

4. The externally mounted die-bonded dual-color COB that varies along the color temperature blackbody curve according to claim 2, characterized in that: The constant current device is connected to the cold light positive electrode pad and the green light chip respectively, and the green light chip is connected to the cold light negative electrode pad.

5. The externally mounted die-bonded dual-color COB that varies along the color temperature blackbody curve according to claim 1, characterized in that: The constant current device is a constant current resistor or a constant current diode.

6. The external die-bonded dual-color COB that varies along the color temperature blackbody curve according to claim 1, characterized in that: The warm light chip group includes several warm light chips connected in series, the cold light chip group includes several cold light chips connected in series, and the green light chip is located between the warm light chips and the cold light chips.

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