WO2021072962A1

WO2021072962A1 - Light-emitting light source having dual color temperatures or multiple color temperatures

Info

Publication number: WO2021072962A1
Application number: PCT/CN2019/125964
Authority: WO
Inventors: 李秀斌
Original assignee: 广州光联电子科技有限公司
Priority date: 2019-10-15
Filing date: 2019-12-17
Publication date: 2021-04-22
Also published as: CN110676361A

Abstract

A light-emitting light source that relates to the technical field of LED illumination and that has dual color temperatures or multiple color temperatures. The light source comprises a ceramic substrate (1) and light-emitting units that are provided on the ceramic substrate (1). The light-emitting units each comprise an LED chip and a fluorescent layer that covers the LED chip, the ceramic substrate (1) is provided with several light-emitting regions, and each light-emitting region is provided with multiple light-emitting units that are arranged in an array, the light emission color temperatures of adjacent light-emitting units in any row and column in at least part of the light-emitting regions on the ceramic substrate (1) being different. The described light-emitting light source can effectively solve the problem of light spots being mixed for an LED light-emitting light source that has dual color temperatures or multiple color temperatures.

Description

Luminous light source with dual color temperature or multiple color temperature

Technical field

The present invention relates to the technical field of LED lighting, and more specifically, to a luminous light source with dual or multi-color temperature.

Background technique

LED, also called light-emitting diode, is a widely used light source in modern times. It has the characteristics of small size, low power consumption, long service life, and environmental protection. It is a solid-state semiconductor device that can convert electrical energy into visible light, and can directly convert electricity into light. The core of the LED is a semiconductor chip, one end of the chip is attached to a bracket, one end is the negative pole, and the other end is connected to the positive pole of the power supply.

Nowadays, the main ones that are widely used are single-color temperature LEDs, as well as dual-color temperature LEDs and multi-color temperature LEDs. However, the existing multi-color temperature LEDs mostly concentrate the chips of the same color temperature in the same area. In this way, when the multi-color temperature LED is lit, because the distribution areas of different color temperatures are distinct, the boundary between the areas of different color temperatures is obvious , It will produce the phenomenon of mottled light, which will adversely affect the visual effect. Therefore, it is necessary to design a light source that is suitable for the arrangement of various color temperature chips and the color temperature can be changed without causing light mottle.

technical problem

The present invention aims to overcome the above-mentioned problem of light mottle in the prior art, and provides a luminous light source with dual or multi-color temperature, which is used to solve the problem of light mottle in the LED with dual or multi-color temperature in the prior art.

The solution to the problem

Technical solutions

The technical solution adopted by the present invention is to provide a luminous light source with dual or multi-color temperature, which includes a ceramic substrate and a light-emitting unit arranged on the ceramic substrate. The light-emitting unit includes an LED chip and a fluorescent layer covering the LED chip The ceramic substrate has a plurality of light-emitting areas, and each light-emitting area has a plurality of light-emitting units arranged in an array, and the color temperature of adjacent light-emitting units in at least part of the light-emitting areas on the ceramic substrate is different.

The ceramic substrate is used to install the light-emitting unit and its connection structure between the ceramic substrate and the light-emitting unit, and to install other related auxiliary devices to form the overall shape of the ceramic substrate with a dual-color temperature or multi-color temperature light source, ensuring a dual-color temperature or multi-color temperature light-emitting structure The ceramic substrate can work normally. The light-emitting unit includes an LED chip and a fluorescent layer covering the LED chip. The LED chip is used to convert electrical energy into light energy; the fluorescent layer is used to change the color temperature of the LED chip, so that the LED chip becomes the required color temperature. The phosphor layer is a phosphor powder layer, and the phosphor layers of different colors are coated on the LED chip to enable the light-emitting unit to obtain different color temperatures. In actual operation, due to different requirements for color temperature, for example, some light-emitting areas are light-emitting units with different color temperatures, and other light-emitting areas are light-emitting units with the same color temperature, there will be at least part of the light-emitting area on the ceramic substrate Above, light-emitting units with different color temperatures need to be arranged.

When installing the light-emitting unit, according to the requirements, the light-emitting units are arranged in an array on the corresponding light-emitting area, and the adjacent light-emitting units in any row and column on the array are coated with different phosphors to make the LED chip become the required color temperature. Let adjacent light-emitting units get different color temperatures. The light-emitting units of different color temperatures are evenly arranged and interlaced with each other, so that the overall light does not cause the problem of light mottle. At the same time, the present invention is also mainly used to adjust the color temperature of a part of the light-emitting area or the entire light-emitting area to form a better visual effect.

Preferably, the light-emitting units adjacent to any row and column in all the light-emitting regions on the ceramic substrate have different light-emitting color temperatures. For light sources that require adjustable color temperature, the color temperatures of adjacent light-emitting units in any row and column of all light-emitting areas are different, and there can be a larger range and more choices. The color temperature of the light-emitting unit can also be adjusted, which is not affected by the single color temperature. The influence of the color temperature of the luminous area.

Preferably, the at least part of the light-emitting area has light-emitting units with three different color temperatures, and the light-emitting units with different color temperatures are alternately arranged between two adjacent rows or two columns, and the light-emitting units with three adjacent different color temperatures are distributed in a triangle. . In this way, the positions of the light-emitting units of different color temperatures cross each other, and the overall light will not have the problem of light mottle.

Preferably, there are four light-emitting units with different color temperatures in the at least part of the light-emitting area, and four adjacent light-emitting units with different color temperatures are distributed in a quadrilateral shape. When there are four light-emitting units with different color temperatures, the light-emitting units of every two adjacent rows or two columns are distributed in a quadrilateral shape, and the positions of the light-emitting units of the four color temperatures cross each other to make the overall light appear harmonious.

Preferably, the at least part of the light-emitting area has N light-emitting units with different color temperatures, and adjacent N light-emitting units with different color temperatures are distributed in an N-sided shape. After the color temperature of the light-emitting unit is diversified, the overall light-emitting effect of the light-emitting unit needs to be uniform. Therefore, the arrangement of the light-emitting units with multiple color temperatures must follow a certain order. When there are N types of light-emitting units with different color temperatures, adjacent N types of light-emitting units with different color temperatures are distributed in an N-sided shape, so that the overall layout of multiple light-emitting areas can be harmonious.

Preferably, the ceramic substrate is connected to the light-emitting unit through multiple lines, each line is provided with an independent pin, and the line and the line are connected in parallel. The way of multi-circuit connection is more flexible, and there are more choices when installing the light-emitting unit; each circuit is provided with independent pins, and the circuit is connected in parallel, so that each circuit can have a separate switch. When controlling the change of the overall color temperature of the light source, the change process can be more gentle, and the branches of the parallel circuit operate normally, almost without affecting each other, and operate independently.

Preferably, in the at least part of the light-emitting area, each row of light-emitting units is arranged with at least two lines. The arrangement of the lines is not limited to being arranged in rows, but can also be arranged in rows. The arrangement is flexible, and when installing, there are more choices when installing light-emitting units with different color temperatures.

Preferably, in the at least part of the light-emitting area, each line is not connected to adjacent light-emitting units. In this way, adjacent light-emitting units are installed on different circuits, which facilitates the distinction, management and control of adjacent light-emitting units.

Preferably, in the at least part of the light-emitting area, the light-emitting unit connected to each circuit has the same light-emitting color temperature. In this way, the light-emitting units with the same light-emitting color temperature are connected on the same route, which facilitates the management and control of the light-emitting units with the same color temperature.

Preferably, the present invention further includes an independent pad, the pad is connected by a gold wire to form a via, and the light-emitting unit is mounted on the pad. In this way, the gold wire connects the pads one by one, and at the same time, it is convenient to accurately install the light-emitting unit on the corresponding pad, achieving convenient, flexible, and fast effects.

Preferably, a solder resist layer is provided on the pad, and the solder resist layer is a white oil layer. White oil is used for solder mask to protect the circuit and prevent soldering.

Preferably, the ceramic substrate is a 0.2-0.8 mm thick aluminum nitride ceramic substrate. Ceramic substrate refers to a special process board in which copper foil is directly bonded to the surface of alumina or aluminum nitride ceramic substrate at high temperature. It has strong mechanical stress, stable shape, high strength, high thermal conductivity, high insulation, and bonding force. Strong, anti-corrosion and other characteristics. The thickness of the ceramic substrate is related to the thermal resistance, and the aluminum nitride ceramic substrate with a thickness of 0.2 to 0.8 mm conforms to the preferred solution of the present invention.

Preferably, the ceramic substrate is provided with a copper foil, and a connection layer is provided on the copper foil, and the connection layer is a nickel-palladium-gold layer, and the nickel-palladium-gold is connected to the gold wire and the pad. Immersion nickel palladium gold is a preferred solution in accordance with the present invention. Immersion nickel-palladium metal is mainly used to isolate the pad from the air to prevent oxidation; in addition, when the gold wire is directly connected to the pad, it is easy to fall off. Immersion nickel-palladium gold can make the gold wire better Connect the pads.

The beneficial effects of the invention

Beneficial effect

Compared with the prior art, the present invention has the beneficial effects that the light-emitting units on at least part of the light-emitting areas on the ceramic substrate are arranged in an array, and the light-emitting units of different color temperatures are arranged alternately on a unique circuit. Not only that, the color temperature changes between adjacent light-emitting areas gradually. In this way, after the light-emitting unit is turned on, there is a problem that the light generated in the entire light-emitting unit does not produce light mottle.

Brief description of the drawings

Description of the drawings

Fig. 1 is a schematic diagram of a circuit of a light-emitting area.

Figure 2 is a schematic diagram of a pad in a light-emitting area.

Figure 3 is a schematic diagram of the arrangement of light-emitting units with three color temperatures.

Fig. 4 is a schematic diagram of the arrangement of light-emitting units with four color temperatures.

The best embodiment for implementing the invention

The best mode of the present invention

Example 1:

As shown in FIG. 1, this embodiment provides a luminous light source with dual color temperature or multiple color temperature, which includes a ceramic substrate 1 and a circuit. The ceramic substrate 1 is an aluminum nitride ceramic substrate with a thickness of 0.2 to 0.8 mm, and may also be an aluminum nitride ceramic substrate with other thicknesses. In this embodiment, a 0.5 mm thick aluminum nitride ceramic substrate may be used, and the length of the aluminum nitride ceramic substrate may be 109.2±0.1 mm, and the width may be 54.5±0.1 mm. The ceramic substrate 1 is formed by splicing multiple light-emitting areas, and one light-emitting area is described here. Mark 2 in the figure is an example of the installation position of the light-emitting unit, and the light-emitting units are all installed in this area of the rectangular parallelepiped. The light-emitting units are arranged in an array, and the color temperature of each adjacent light-emitting unit is not consistent. The light emitting unit includes an LED chip and a fluorescent layer. The LED chip can be a blue chip, the fluorescent layer is a phosphor layer, and the phosphor is a yellow color or a combination of red and green. Of course, the light source is not limited to LED white light, and the phosphor is not limited to one yellow or a combination of red and green. The phosphor layers of different colors are covered on the LED chip to enable the light-emitting unit to obtain different color temperatures.

A circuit is arranged on the ceramic substrate, each circuit is connected with an independent pin, and the circuit and the circuit are connected in parallel. The labels A, B, and C in the example in Figure 1 are examples of labeling lines. A can be connected in series to form a line through a gold wire, B is connected in series to form a line, and C is connected in series to form a line. Other lines are based on this analogy. Each line is not connected to adjacent light-emitting units, and the same line is not connected to light-emitting units with different color temperatures. For example, in a two-color temperature light source, the color temperature of the light-emitting unit on the circuit can be a circuit with a lower color temperature of 2700K, and a circuit with a higher color temperature of 5000K. In a multi-color temperature light source, the color temperature of the light-emitting unit on the circuit can be a lower color temperature of 2700K for one circuit, and a higher color temperature for the other two circuits, such as 5000K and 6000K. In actual demand, there will be more color temperature combinations, including the aforementioned color temperature combinations and not limited to the aforementioned color temperature combinations. The color temperature value can be obtained according to different colors of phosphors and their combinations. The lines are arranged alternately between the lines, so that light-emitting units with different color temperatures can be arranged next to each other. Installing the same color temperature on the same line makes the light-emitting units easy to manage and control the light-emitting units. Figure 1 and Figure 2 correspond to each other.

As shown in Figure 2, the example of the mounting position of the light-emitting unit marked 2 in the figure is also an example of the pad position. When the ceramic substrate is made, there is a copper foil on the ceramic substrate, and a connecting layer is arranged on the copper foil, and the connecting layer is an immersion nickel-palladium-gold layer, and the immersion nickel-palladium-gold is connected to the gold wire and the pad. Immersion nickel palladium gold can make the gold wire and the pad better connect. Use gold wires to connect the pads on the same circuit to form a via. The connection position between the gold wire and the pad is the two small ends of the pad, as shown in the figure as an example of position 3. Each pad is provided with a solder mask, and this solder mask is a white oil layer. The thickness of the white oil is 10 to 15 μm, and the white oil cannot be peeled off or cracked. After the white oil is printed on the pad, the relatively exposed position on the pad is the two small ends of the pad

Invention embodiment

Embodiments of the present invention

Example 2:

As shown in FIG. 3, the light-emitting units with three different color temperatures are arranged in a staggered arrangement, and the light-emitting units with three different color temperatures are arranged in a triangular shape. Three light-emitting units with different color temperatures are located at the three vertices of the triangle. Number 1, number 2, and number 3 respectively represent light-emitting units with different color temperatures.

Example 3:

As shown in Fig. 4, in the arrangement of four light-emitting units with different color temperatures, four adjacent light-emitting units with different color temperatures are distributed in a quadrilateral shape, and four light-emitting units with different color temperatures are located at the four vertices of the quadrilateral. The reference number 1, the reference number 2, the reference number 3, and the reference number 4 respectively represent light-emitting units with different color temperatures.

Of course, there are other arrangements of light-emitting units with multiple color temperatures. If there are N light-emitting units with different color temperatures, adjacent light-emitting units with N different color temperatures are distributed in an N-sided shape. At the same time, the arrangement of the multi-color temperature light-emitting units is not limited to only being arranged in a multi-deformed manner. The polygonal arrangement is a preferred solution, and it can also be arranged in an irregular manner, or other types that can mix multiple color temperatures. Arrangement form.

Obviously, the above-mentioned embodiments of the present invention are merely examples to clearly illustrate the technical solutions of the present invention, and are not intended to limit the specific implementation manners of the present invention. Any modification, equivalent replacement and improvement made within the spirit and principle of the claims of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

A luminous light source with dual or multi-color temperature, comprising a ceramic substrate, a light-emitting unit arranged on the ceramic substrate, the light-emitting unit comprising an LED chip and a fluorescent layer covering the LED chip, characterized in that the ceramic substrate has a plurality of There are two light-emitting areas, and each light-emitting area has a plurality of light-emitting units arranged in an array, and the light-emitting color temperatures of adjacent light-emitting units in at least part of the light-emitting areas on the ceramic substrate are different.
The light-emitting light source with dual or multi-color temperature according to claim 1, characterized in that the light-emitting units adjacent to any row and column in all the light-emitting regions on the ceramic substrate have different light-emitting color temperatures.
The light-emitting source with dual or multi-color temperature according to claim 1, wherein the at least part of the light-emitting area has three types of light-emitting units with different color temperatures, each of which is different between two adjacent rows or two columns. The color temperature light-emitting units are arranged in a staggered arrangement, and three adjacent light-emitting units with different color temperatures are distributed in a triangle.
The light-emitting light source with dual or multi-color temperature according to claim 1, wherein the at least part of the light-emitting area has four light-emitting units with different color temperatures, and four adjacent light-emitting units with different color temperatures are quadrangular distributed.
The light-emitting light source with dual or multi-color temperature according to claim 1, characterized in that there are N light-emitting units with different color temperatures in the at least part of the light-emitting area, and N light-emitting units with different color temperatures are adjacent to each other. Hexagonal distribution.
The light-emitting light source with dual or multi-color temperature according to claim 1, wherein the ceramic substrate is connected to the light-emitting unit through multiple lines, each line is provided with an independent pin, and the line and the line are Are connected in parallel between.
The light-emitting light source with dual color temperature or multi-color temperature according to claim 6, characterized in that, in the at least part of the light-emitting area, each row of light-emitting units is arranged with at least two lines.
The luminous light source with dual or multi-color temperature according to claim 6, characterized in that, in the at least part of the luminous area, each line is not connected to adjacent luminous units.
The light-emitting light source with dual or multi-color temperature according to claim 6, wherein in the at least part of the light-emitting area, the light-emitting unit connected to each circuit has the same light-emitting color temperature.
The light-emitting light source with dual color temperature or multi-color temperature according to any one of claims 6 to 9, characterized in that it further comprises independent pads, the pads are connected by gold wires to form a path, and the light-emitting unit Mounted on the pad.
The luminescent light source with dual color temperature or multiple color temperature according to claim 10, wherein a solder resist layer is provided on the pad, and the solder resist layer is a white oil layer.
The luminescent light source with dual color temperature or multiple color temperature according to claim 10, wherein the ceramic substrate is an aluminum nitride ceramic substrate with a thickness of 0.2 to 0.8 mm.
The luminescent light source with dual color temperature or multiple color temperature according to claim 12, wherein the ceramic substrate is provided with a copper foil, and a connection layer is provided on the copper foil, and the connection layer is an immersion nickel-palladium-gold layer , Immersion nickel palladium gold is connected to the gold wire and the pad.