Wide-color-gamut patch type LED light source
By using a combination of convex-coated low-refractive-index phosphor adhesive and high-refractive-index encapsulating adhesive in LED light sources, along with a white wall adhesive isolation design, the problems of color purity and light mixing uniformity are solved, achieving a wider color gamut and more efficient light mixing effect, making it suitable for high-quality display applications.
Patent Information
- Application Number
- CN202522184300.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-16
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2035-10-16
AI Technical Summary
Existing surface-mount LED light sources have shortcomings in terms of color purity and light mixing uniformity. In particular, the influence of phosphors in three-color or four-color broadband technology leads to low color purity and uneven light mixing. The partitioned design increases the size of the light source, which is not conducive to miniaturization.
The design combines convex-coated low-refractive-index phosphor adhesive with high-refractive-index encapsulant adhesive, utilizes the Fresnel reflection principle to reduce blue light absorption, and sets up white wall adhesive to isolate adjacent LED chips, ensuring that different colors of light do not interfere with each other. The driving circuit is simplified through chip design with matched electrical characteristics.
It improves the purity of light color and the light mixing effect, achieves a wider color gamut range, meets the needs of high-quality display, and maintains efficient light mixing and miniaturized design of light source within a limited space.
Smart Images
Figure CN223584652U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to LED light source technical field especially relates to a wide color gamut patch type LED light source. BACKGROUND
[0002] In the current patch type LED dimming field, in order to improve monochromaticity and improve color purity, thereby improving the color gamut range of mixed light, for example, the red green blue three colors are driven independently by RGB three color chips. However, the chip types of this design are different, the driving voltage is different, and the spectral half-width of the chip is relatively narrow, although the final synthesized light color gamut is relatively large, but the color rendering property will be relatively poor.
[0003] Therefore, the current more development direction is three color or four color wide spectrum technology, that is, green light and red light synthesized by blue light chip plus fluorescent powder. This way can obtain wider spectrum, thereby obtaining better color rendering property, and the chip voltage is consistent, the driving circuit can use a power supply, and the design is simpler. However, since multiple fluorescent powders are involved in a light source area, various fluorescent powders are easily affected by blue light, resulting in low color purity.
[0004] In order to reduce the influence of fluorescent powder on multiple colors, the current mainstream is patch partition design. This design sets up independent light of various colors, which can improve the color purity problem to a certain extent, but will cause different color points in mixed light, and the mixed light uniformity is poor. In addition, the partition design can also increase the overall size of the light source, which is not conducive to miniaturization application.
[0005] Therefore, it is necessary to further improve and perfect the prior art to overcome these deficiencies, and the utility model is made based on this situation. CONTENT OF UTILITY MODEL
[0006] The utility model aims at overcoming the deficiencies of prior art, and provides a wide color gamut patch type LED light source in which various colors have little influence on each other in a light source area.
[0007] The utility model is realized through the following technical schemes:
[0008] To solve the above technical problems, the utility model provides a kind of wide color gamut patch type LED light source, including the support with inner cavity, LED light source module being located in the inner cavity of support, and the encapsulation glue for encapsulating LED light source module in the inner cavity of support;The LED light source module at least includes blue light source, red light source and green light source, the blue light source includes first blue light LED chip, the red light source includes second blue light LED chip and red phosphor glue coated on it, and the green light source includes third blue light LED chip and green phosphor glue coated on it;The refractive index of the encapsulation glue is greater than the refractive index of each phosphor glue.
[0009] To further solve the technical problems to be solved by the utility model, in a kind of wide color gamut patch type LED light source provided by the utility model, the red phosphor glue and green phosphor glue are mixed by first silica gel and corresponding color phosphor, wherein the refractive index of the first silica gel is not greater than 1.45, and the mass ratio of the first silica gel and phosphor is less than 1;The encapsulation glue includes second silica gel, and the refractive index of the second silica gel is not less than 1.5.
[0010] To further solve the technical problems to be solved by the utility model, in a kind of wide color gamut patch type LED light source provided by the utility model, the blue light source includes still including first phosphor glue coated on first blue light LED chip, the first phosphor glue is mixed by first silica gel and first phosphor, and the mass ratio of the first silica gel and first phosphor is greater than 1.
[0011] To further solve the technical problems to be solved by the utility model, in a kind of wide color gamut patch type LED light source provided by the utility model, the pitch of adjacent LED chip is not less than 0.6mm.
[0012] To further solve the technical problems to be solved by the utility model, in a kind of wide color gamut patch type LED light source provided by the utility model, white wall glue for isolating each other is arranged between adjacent LED chip, and the white wall glue is convex;The height of the white wall glue is not less than 2 times the height of LED chip, and also not less than the height of corresponding phosphor glue.
[0013] To further solve the technical problems to be solved by the utility model, in a kind of wide color gamut patch type LED light source provided by the utility model, the LED light source module further includes fourth light source, and the fourth light source is white light source, and the white light source includes fourth blue light LED chip and second phosphor glue coated on it.
[0014] In order to further solve the technical problems to be solved by the utility model, in the wide color gamut patch type LED light source, the LED light source module further comprises a fourth light source, the fourth light source comprises a fifth blue light LED chip or a violet light LED chip, and the voltage difference between the fifth blue light LED chip or the violet light LED chip and the first blue light LED chip is within ±0.2V.
[0015] In order to further solve the technical problems to be solved by the utility model, in the wide color gamut patch type LED light source, the bottom of the support inner cavity is provided with a plurality of electrode pads, and each LED chip is welded on the corresponding electrode pad and is electrically connected with the same.
[0016] In order to further solve the technical problems to be solved by the utility model, in the wide color gamut patch type LED light source, the bottom of the support inner cavity is provided with a plurality of electrode pads, and each LED chip is welded on the corresponding electrode pad and is electrically connected with the same.
[0017] In order to further solve the technical problems to be solved by the utility model, in the wide color gamut patch type LED light source, the support comprises a bottom plate and a ring-shaped dam arranged on the top surface periphery of the bottom plate, the bottom surface periphery of the bottom plate is provided with a plurality of support pads for electrically connecting with an external power supply, the support pads are electrically connected with the electrode pads, and the LED light source module and the encapsulation glue are located in the support inner cavity surrounded by the dam.
[0018] Compared with the prior art, the utility model has the following advantages:
[0019] The utility model discloses the combination of the low refractive index fluorescent powder glue and the high refractive index encapsulation glue, utilizes the principle of Fresnel reflection, further reduces the proportion of blue light absorbed by the fluorescent powder, improves the light extraction efficiency, improves the light color purity, provides the powerful guarantee for realizing the wide color gamut.In addition, the utility model adopts the white wall glue isolation design.Through setting the convex white wall glue between the adjacent LED chips, effectively blocks the mutual interference between different color lights, significantly improves the purity of each monochromatic light, thereby realizes the wider color gamut range.In general, the utility model realizes the minimization of the mutual influence between various colors in the limited light source area, has the remarkable promotion in the color gamut range, light extraction efficiency and mixed light effect etc., can satisfy the demand of high quality display application. BRIEF DESCRIPTION OF DRAWINGS
[0020] The specific embodiment of the utility model will be explained in further detail below in combination with the drawings, wherein:
[0021] Figure 1 It is the structural schematic diagram of example one.
[0022] Figure 2 is Figure 1 a sectional view at A-A in FIG.
[0023] Figure 3 is a structural schematic diagram of Example Two;
[0024] Figure 4 is a structural schematic diagram of Example Three;
[0025] Figure 5 is a structural schematic diagram of Example Four;
[0026] Figure 6 is Figure 5 a sectional view at B-B in FIG. DETAILED DESCRIPTION
[0027] In order for those skilled in the art to better understand the technical scheme of the present application, the present application will be further described in detail below in conjunction with the drawings and specific embodiments.
[0028] The present application provides a wide color gamut patch type LED light source, aiming to overcome the problems of low color purity and poor mixed light uniformity in the prior art, so as to realize wider color gamut coverage and better color rendering.
[0029] Example One: Three-color wide color gamut patch type LED light source Figures 1-2 )
[0030] As shown in Figure 1 and Figure 2 , the present embodiment discloses a three-color wide color gamut patch type LED light source. The LED light source includes a bracket 1 with an inner cavity, which is used to carry and protect the internal light source module. In the inner cavity of the bracket 1, an LED light source module is arranged, which is the core component to realize wide color gamut display. The encapsulating glue 2 is used to firmly encapsulate the LED light source module in the inner cavity of the bracket 1, protecting it from environmental factors.
[0031] The LED light source module includes at least three colors of light sources: a blue light source 3, a red light source 4, and a green light source 5. The blue light source 3 is composed of a first blue light LED chip 31, which directly emits blue light. The red light source 4 uses a second blue light LED chip 41, and a convex red phosphor paste 42 is coated on the surface of the second blue light LED chip. The blue light emitted by the second blue light LED chip excites the red phosphor, causing it to emit red light. Similarly, the green light source 5 is composed of a third blue light LED chip 51 and a convex green phosphor paste 52 coated thereon. The blue light emitted by the third blue light LED chip excites the green phosphor, causing it to emit green light. Preferably, the green phosphor paste has a peak wavelength range of 500-580 nm, and the red phosphor paste has a peak wavelength range of 600-750 nm.
[0032] To facilitate dimming, ensure color consistency, and improve driving efficiency, the first blue light LED chip 31, the second blue light LED chip 41, and the third blue light LED chip 51 are preferably blue light LED chips with the same voltage or similar voltage (voltage difference within ±0.1 V). Such design can simplify the driving circuit and ensure that each color of LED chip has similar electrical characteristics when working, thereby achieving more accurate color control.
[0033] The support 1 includes a bottom plate 11 and a ring-shaped dam 12. The bottom plate 11 serves as the base of the LED light source, providing support and heat dissipation. The dam 12 is arranged around the top surface of the bottom plate 11, forming a ring-shaped structure for enclosing the LED light source module and the encapsulating glue 2, preventing them from overflowing. The bottom surface of the bottom plate 11 is provided with a plurality of support pads 83 for connecting with the external power supply circuit to provide power for the LED light source. The support pads 83 and the electrode pads 81 are electrically connected to achieve power transmission.
[0034] At the bottom of the inner cavity of the support 1, a plurality of electrode pads 81 are provided. Each LED chip, such as the first blue light LED chip 31, the second blue light LED chip 41, and the third blue light LED chip 51, is fixed on the corresponding electrode pad 81 by welding and achieves electrical connection.
[0035] The refractive index of the encapsulating glue 2 is greater than that of each phosphor paste. High-refractive-index encapsulating glue can effectively improve light extraction efficiency and reduce light loss during encapsulation. In addition, high-refractive-index encapsulating glue also helps to improve the mixing effect, making different colors of light more uniformly mixed, thereby improving the overall light color quality of the LED light source. In this embodiment, the encapsulating glue 2 preferably uses a high-refractive-index second silicone glue with a refractive index not less than 1.5. In addition, the encapsulating glue can also use silicone glue doped with a small amount of low-concentration phosphor, the main purpose of which is to improve the mixing performance and adjust the color rendering of each monochromatic light. The mass ratio of silicone glue to phosphor is required to be greater than 2.
[0036] The red fluorescent powder glue 42 and the green fluorescent powder glue 52 are both mixed by a first silica gel with a low refractive index and a corresponding color fluorescent powder, wherein the refractive index of the first silica gel is not greater than 1.45. In addition, the mass ratio of the first silica gel and the fluorescent powder is less than 1, mainly in order to achieve a viscous fluorescent powder glue. It is preferred to use a high-precision dispensing machine for dispensing, since the glue is relatively viscous, a convex morphology (such as a semi-spherical, semi-ellipsoidal, etc.) is formed.
[0037] By setting the low-refractive-index green and red fluorescent powder glue in a convex manner, combined with the design of the high-refractive-index packaging glue, when the blue light LED is lit alone, the blue light generated by the blue light LED will first be incident into the packaging glue 2, and part of the blue light will also propagate from the packaging glue 2 to the nearby fluorescent powder glue. Since the light propagating to the fluorescent powder glue (from the packaging glue 2 to the fluorescent powder glue) is incident from the high-refractive-index glue to the low-refractive-index glue at a large angle, it will be more likely to be reflected, thereby reducing the absorption of the fluorescent powder to the blue light, and improving the purity of the color of the light.
[0038] The LED chips can be arranged in parallel or inclined, as long as they are uniformly distributed and wiring is facilitated.
[0039] In order to ensure that the adjacent fluorescent powder glue does not contact, the embodiment sets the distance between the adjacent LED chips to be not less than 0.6 mm. Here, it is preferred to use a high-precision dispensing machine for dispensing, since the glue is relatively viscous, a convex morphology is formed, and therefore the distance between the chips needs to be set to be not less than 0.6 mm.
[0040] Preferably, the blue light source 3 can also be coated with a small amount of first fluorescent powder glue on the first blue light LED chip 31, the first fluorescent powder glue being mixed by a first silica gel and a first fluorescent powder, and the mass ratio of the first silica gel and the first fluorescent powder being greater than 1. In this way, better spectral continuity can be achieved in color matching. The first fluorescent powder here can adopt yellow, cyan or a combination of multiple colors.
[0041] Embodiment two: LED light source with heat dissipation function Figure 3
[0042] As shown in Figure 3 , the embodiment provides an LED light source with stronger heat dissipation capacity, which is especially suitable for the case where the chip power is large. The main difference between the embodiment and embodiment one is that, in order to better dissipate heat, the embodiment uses a separate die bonding pad 82 to fix each LED chip.
[0043] Each LED chip is soldered on the corresponding die-bonding pad 82 and is electrically connected to the corresponding electrode pad 81 through a wire. The die-bonding pad 82 is preferably a metal pad, such as a copper pad, an aluminum pad or an iron pad, which is attached to the bottom surface of the inner cavity of the support 1 and can conduct heat. Such a design can achieve effective heat conduction, rapidly transfer the heat generated by the LED chip to the support 1, and dissipate the heat through the support, thereby reducing the working temperature of the LED chip and improving the reliability and service life of the LED chip.
[0044] Embodiment three: four-color wide-gamut patch-type LED light source Figure 4
[0045] As shown in Figure 4 , the embodiment discloses a four-color wide-gamut patch-type LED light source. Unlike the three-color light sources of the previous two embodiments, the LED light source module of the embodiment further includes a fourth light source 6.
[0046] The fourth light source 6 can be various types of light sources, for example:
[0047] White light source: The fourth light source 6 can be a white LED, which includes a fourth blue LED chip and a second fluorescent powder glue coated thereon, for improving the continuity of the mixed light spectrum and making the light color more natural. The voltage of the fourth blue LED chip is the same as or close to that of the first blue LED chip 31 (the voltage difference is within ±0.1 V) to ensure that the electrical properties are matched. The second fluorescent powder glue herein is a mixture of silicone and second fluorescent powder, and the second fluorescent powder is preferably a combination of yellow, cyan, or multiple colors of fluorescent powder.
[0048] Fifth blue light LED chip: The fourth light source 6 can also be a fifth blue light LED chip of a different wavelength, which is used to supplement the blue light band, such as 460-480 nm, which can achieve the adjustment of human rhythm.
[0049] Purple light LED chip: The fourth light source 6 can also be a purple light LED chip, which has a wavelength range of 400-440 nm, and is used to supplement the purple light band to further expand the color gamut range.
[0050] If the fourth light source 6 is a fifth blue light LED chip or a purple light LED chip, in order to ensure that the electrical properties of each chip are matched and improve the overall stability of the light source, the voltage difference between the fifth blue light LED chip or the purple light LED chip and the first blue light LED chip 31 should be controlled within ±0.2 V.
[0051] Embodiment four: four-color wide-gamut patch-type LED light source with white wall glue isolation Figures 5-6
[0052] As shown in Figure 5 and Figure 6 As shown, the present embodiment further optimizes the isolation scheme between LED chips on the basis of Embodiment Three. The present embodiment sets a white wall glue 7 between adjacent LED chips for isolating the two.
[0053] The white wall glue 7 is convex in shape, which helps to improve the light extraction efficiency and effectively prevent the mixing between different color lights, thereby improving the monochromaticity and achieving a wider color coordinate range. The height of the white wall glue 7 is not less than 2 times the height of the LED chip, nor less than the height of the corresponding phosphor glue, so as to ensure sufficient light blocking effect. In addition, the white wall glue 7 and each phosphor glue are preferably dispensed by using a high-precision dispensing machine.
Claims
1. A wide color gamut patch-style LED light source, characterized by: The bracket (1) includes a bracket (1) with an inner cavity, an LED light source module arranged in the inner cavity of the bracket (1), and a packaging glue (2) for packaging the LED light source module in the inner cavity of the bracket (1); the LED light source module at least includes a blue light source (3), a red light source (4) and a green light source (5), the blue light source (3) includes a first blue light LED chip (31), the red light source (4) includes a second blue light LED chip (41) and a red fluorescent powder glue (42) coated thereon, and the green light source (5) includes a third blue light LED chip (51) and a green fluorescent powder glue (52) coated thereon; the refractive index of the packaging glue (2) is greater than the refractive index of each fluorescent powder glue.
2. A broad color gamut patch-style LED light source according to claim 1, characterized in that: The red fluorescent powder glue (42) and the green fluorescent powder glue (52) are each mixed from a first silica gel and a corresponding color fluorescent powder, wherein the refractive index of the first silica gel is not greater than 1.45, and the mass ratio of the first silica gel and the fluorescent powder is less than 1; the packaging glue (2) includes a second silica gel, and the refractive index of the second silica gel is not less than 1.
5.
3. A broad color gamut patch-style LED light source according to claim 1, characterized in that: The blue light source (3) further includes a first fluorescent powder glue coated on the first blue light LED chip (31), the first fluorescent powder glue is mixed from a first silica gel and a first fluorescent powder, and the mass ratio of the first silica gel and the first fluorescent powder is greater than 1.
4. A broad color gamut patch-style LED light source according to claim 1, characterized in that: The spacing between adjacent LED chips is not less than 0.6 mm.
5. A wide-gamut patch-style LED light source according to claim 1, characterized in that: A white wall glue (7) is arranged between adjacent LED chips for isolating the two, the white wall glue (7) is convex, and the height of the white wall glue (7) is not less than 2 times the height of the LED chip or not less than the height of the corresponding fluorescent powder glue.
6. A wide-gamut patch-style LED light source according to claim 1, characterized in that: The LED light source module further includes a fourth light source (6), the fourth light source (6) is a white light source, and the white light source includes a fourth blue light LED chip and a second fluorescent powder glue coated thereon.
7. A wide-gamut patch-style LED light source according to claim 1, characterized in that: The LED light source module further includes a fourth light source (6), the fourth light source (6) includes a fifth blue light LED chip or a purple light LED chip, and the voltage difference between the fifth blue light LED chip or the purple light LED chip and the first blue light LED chip (31) is within ±0.2V.
8. A broad color gamut patch-style LED light source according to claim 1, characterized in that: The bottom of the inner cavity of the bracket (1) is provided with a plurality of electrode pads (81), and each LED chip is welded on and electrically connected to the corresponding electrode pad (81).
9. A wide-gamut patch-style LED light source according to claim 1, characterized in that: The bottom of the inner cavity of the bracket (1) is provided with a plurality of electrode pads (81) and a plurality of die bonding pads (82) independent of the electrode pads (81), and each LED chip is welded on the corresponding die bonding pad (82) and electrically connected to the corresponding electrode pad (81).
10. A broad color gamut patch-style LED light source according to claim 8 or 9, characterized in that: The bracket (1) includes a bottom plate (11) and a ring-shaped dam (12) arranged on the top surface of the bottom plate (11), the bottom surface of the bottom plate (11) is provided with a plurality of bracket pads (83) for electrical connection with an external power supply, the bracket pads (83) are electrically connected to the electrode pads (81), and the LED light source module and the packaging glue (2) are located in the inner cavity of the bracket (1) surrounded by the dam (12).