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CN-121985656-A - Three-color COB light source added with green light full-color-gamut dimming and manufacturing method thereof

CN121985656ACN 121985656 ACN121985656 ACN 121985656ACN-121985656-A

Abstract

The invention discloses a three-color COB light source added with green light full-color-gamut dimming and a manufacturing method thereof, and relates to the technical field of COB light sources. The invention discloses a three-color COB light source added with green light full color domain dimming, which at least comprises a substrate, a crystal fixing area and a light emitting unit, wherein the substrate is provided with a front electric circuit and a back electric circuit which are electrically connected, the crystal fixing area is arranged on the front electric circuit and is arranged as a common anode, the light emitting unit is arranged on the crystal fixing area in a vertical bar shape or a full-sky star shape and comprises a positive white light emitting unit, a warm white light emitting unit and a green light emitting unit, the light emitting units of three colors independently control the light emitting intensity, and the light emitting unit is a flip chip or a ceramic lamp bead. The three-color COB light source provided by the invention realizes high color rendering of CRI >95 under full-color-range dimming, and meanwhile, the mixed light color coordinates are clung to the black body track line, so that the color is true and natural, and the contradiction between the green bias of the single color light and the red bias of the mixed light color in a double-color temperature scheme is solved.

Inventors

  • HUANG SHIWEI
  • CAO HEPING
  • WANG HAILIN
  • WANG JIANWEI

Assignees

  • 东莞领泰光电科技有限公司

Dates

Publication Date
20260505
Application Date
20260131

Claims (10)

  1. 1. A three-color COB light source added with green light full-color-gamut dimming is characterized by at least comprising: a substrate provided with a front-side electric circuit and a back-side electric circuit which are electrically connected; The die bonding area is arranged on the front-side electric wire and is arranged as a common anode; the light-emitting units are arranged on the die bonding area in a vertical bar shape or a full-sky star shape, and comprise a positive white light-emitting unit, a warm white light-emitting unit and a green light-emitting unit, the light-emitting units of three colors independently control the light-emitting intensity, and the light-emitting units are flip chips or ceramic lamp beads.
  2. 2. The trichromatic COB light source of claim 1, wherein the substrate is a flip-chip substrate, the thickness of the substrate is 1-4mm, the substrate is made of a heat conductive material with a heat conductivity coefficient of 8-15w/m ̇ k, the substrate is a flip-chip superconductive aluminum substrate or a flip-chip red copper substrate, the front-side electric circuit and the back-side electric circuit are electrically connected through a conductive through hole, the diameter of the conductive through hole is 0.1-0.3mm, the conductive through hole is filled with electroplated copper paste, heat conductive silicone grease or resin, and the length of the die bonding area is 0.5-2.0mm and the width of the die bonding area is 0.5-2.0mm.
  3. 3. The three-color COB light source with the addition of the dimming of the green light full color gamut according to claim 1, wherein the positive white light emitting unit and the warm white light emitting unit are sequentially arranged when the vertical bar is arranged, the green light emitting unit is uniformly arranged between the positive white light emitting unit and the warm white light emitting unit, the vertical bar positioned at the outermost side is the positive white light emitting unit, and the positive white light emitting unit, the warm white light emitting unit and the green light emitting unit are uniformly distributed in a staggered manner when the vertical bar is arranged in a star shape.
  4. 4. The trichromatic COB light source of claim 1 added with green full-color-gamut dimming, wherein the color temperature of the positive white light emitting unit is set to 5000-20000K, the color temperature of the warm white light emitting unit is set to 1800-3500K, and the wavelength of the green light emitting unit is 520-530nm.
  5. 5. The tri-color COB light source of claim 1 with added green full-color gamut dimming, wherein the flip chip is a flip gold tin motor pole structure with a length of 0.5-2mm and a width of 0.5-2mm, and comprises a positive white light chip, a warm white light chip, and a green light chip.
  6. 6. The tri-color COB light source of claim 1 wherein the ceramic beads comprise a white light bead, a warm white light bead, and a green light bead, the ceramic beads being obtained from the flip chip package on the bead substrate.
  7. 7. The trichromatic COB light source of claim 1, wherein the bead substrate is a ceramic substrate, the thickness of the bead substrate is 0.5-1mm, the bead substrate is provided with a front conductive pad and a back conductive pad electrically connected by a bead conductive via, and the diameter of the bead conductive via is 0.1-0.2mm.
  8. 8. A method for manufacturing a green full-gamut dimming added three-color COB light source as claimed in any one of claims 1 to 7, characterized in that the method for manufacturing a green full-gamut dimming added three-color COB light source comprises the steps of: Providing a substrate, and forming a front-side electric circuit and a back-side electric circuit which are electrically connected on the substrate; forming a die bonding area on the front side electric line, and printing solder paste on the die bonding area to form a bonding pad; fixing a light emitting unit on the bonding pad; and coating fluorescent powder glue on the light-emitting units to form a warm white light-emitting unit, a positive white light-emitting unit and a green light-emitting unit, so as to obtain the three-color COB light source added with green light full-color-gamut dimming.
  9. 9. The method of manufacturing a tri-color COB light source with green light full-color-gamut dimming of claim 8, wherein the thickness of the solder paste is 0.04-0.12mm.
  10. 10. The method for manufacturing a tri-color COB light source with the addition of the green full-color gamut dimming of claim 8, wherein the phosphor paste is obtained by mixing red phosphor, green phosphor, silica gel and a diluent.

Description

Three-color COB light source added with green light full-color-gamut dimming and manufacturing method thereof Technical Field The invention relates to the technical field of COB light sources, in particular to a three-color COB light source added with green light full color domain dimming and a manufacturing method thereof. Background An LED (LIGHT EMITTING Diode) package is a key element for obtaining a high-quality LED lighting source, and COB (Chip On Chip) packages are widely used in LED packages due to their low thermal resistance and high luminous flux density. In the current common COB light source, dimming is generally performed by adopting a method that an RGB three-primary-color light mixing scheme mixes and generates different colors by independently controlling the brightness of three single-color LEDs of red (R), green (G) and blue (B). However, due to the discontinuity of the RGB spectrum, the Color Rendering Index (CRI) of white light produced by mixing is generally low, and color reproducibility is poor, so that it is difficult to meet the requirement of high quality illumination on color authenticity. Another is a positive white light and warm white light dual color temperature mixing scheme. The color temperature adjustment in a certain range can be realized by adjusting the luminous flux ratio of the cool color adjusting white light to the warm color adjusting white light. However, this approach has an inherent disadvantage in that in order for the color coordinates of the mixed light to fall on or near the black body locus (planckian locus), i.e., the DUV value is near 0, the respective color coordinates of the positive white light and the warm white light need to be pre-adjusted to a position away from the black body locus (typically DUV is 0.003-0.008). This results in a perceived greenish color for the human eye when looking at either the white light alone or the warm white light, affecting the quality of the monochromatic light. When this is used for mixing of "greenish" monochromatic light, although the mixed light DUV can be reduced in negative value, it is difficult to control in the vicinity of zero with accuracy, and the color expression of the mixed light is still not ideal. Therefore, how to reduce the mutual influence between the lights with different color temperatures as much as possible, so as to improve the light emitting effect and the light emitting uniformity of the COB light source, reduce the control difficulty of the COB light source production, and improve the production efficiency is a technical problem to be solved by those skilled in the art. Disclosure of Invention The invention aims to provide a three-color COB light source added with green light full-color-gamut dimming and a manufacturing method thereof, which solve the following technical problems: the existing COB light source has the problems of poor light emitting effect, uneven light emitting and low production efficiency. The aim of the invention can be achieved by the following technical scheme: a tri-color COB light source with added green full color gamut dimming, comprising at least: a substrate provided with a front-side electric circuit and a back-side electric circuit which are electrically connected; The die bonding area is arranged on the front-side electric wire and is arranged as a common anode; the light-emitting units are arranged on the die bonding area in a vertical bar shape or a full-sky star shape, and comprise a positive white light-emitting unit, a warm white light-emitting unit and a green light-emitting unit, the light-emitting units of three colors independently control the light-emitting intensity, and the light-emitting units are flip chips or ceramic lamp beads. The substrate is a flip-chip substrate, the thickness of the substrate is 1-4mm, the substrate is made of a heat conduction material with a heat conduction coefficient of 8-15w/m ̇ k, the substrate is a flip-chip superconducting aluminum substrate or a flip-chip red copper substrate, the front-side electric circuit and the back-side electric circuit are electrically connected through a conductive through hole, the diameter of the conductive through hole is 0.1-0.3mm, the conductive through hole is filled with electroplated copper paste, heat conduction silicone grease or resin, and the length of the die bonding area is 0.5-2.0mm and the width of the die bonding area is 0.5-2.0mm. The white light emitting unit and the warm white light emitting unit are sequentially arranged when the vertical bars are arranged, the green light emitting unit is uniformly arranged between the white light emitting unit and the warm white light emitting unit, the vertical bars positioned at the outermost sides are the white light emitting unit, and the white light emitting unit, the warm white light emitting unit and the green light emitting unit are uniformly distributed in a staggered manner when the white light emitting unit is arranged i