CN209325692U - A kind of fluorescent lamp - Google Patents

Abstract

The utility model relates to a fluorescent lamp, which includes a lamp tube and a surface light source module arranged in the lamp tube; the surface light source module includes a substrate, a large-angle light source, a high-refractive-index transparent waveguide layer and a diffusion film layer. The substrate is provided with several large-angle light-emitting light sources, and a high-refractive-index transparent waveguide layer covering the large-angle light-emitting light source is also arranged on the substrate, and the height of the high-refractive index transparent waveguide layer is equal to or higher than the height of the large-angle light-emitting source , The upper surface of the high refractive index transparent waveguide layer is also provided with a diffusion film layer; the refractive index of the high refractive index transparent waveguide layer is greater than the refractive index of the lower surface of the diffusion film layer. The utility model has the advantages that: the utility model fluorescent lamp can increase the light emitting angle of the light source, improve the light mixing effect, avoid uneven brightness and reduce the overall thickness.

Description

a fluorescent lamp

technical field

The utility model relates to a lamp, in particular to a fluorescent lamp.

Background technique

LED is a semiconductor light-emitting device that can convert electrical energy into light. It is different from the three-based toner light-emitting principle of incandescent lamp tungsten light and fluorescent energy-saving lamps. It is radiated by the carrier inside the semiconductor to recombine light. It has a long service life, The advantages of good luminous effect, no radiation and low energy consumption. With the improvement of people's concept of environmental protection and energy saving, LEDs are widely used in lighting fixtures, such as fluorescent lamps. The traditional front-mounted LED with reflector structure, as shown in Figure 1, includes a reflective layer 11, a substrate 12, an N-GaN layer 13, and a P-GaN layer 14 that are sequentially arranged from bottom to top; LED installation, as shown in Figure 2, includes a reflective layer 21, a P-GaN layer 22, a light-emitting layer 23, an N-GaN layer 24, and a substrate 25 arranged sequentially from bottom to top; The reflective layers emit light from five sides, and the reflective layers are arranged on the side close to the substrate, that is, the bottom surface of the LED chip.

At present, in the light source structure formed by encapsulating LED chips with a mirror structure, the light output angle is only about 120°, which is limited in the use of surface light sources in the lighting industry.

For example: There are three main methods for traditional direct-surface light-emitting modules:

(1) Adopt a light source array composed of conventional LED chips, set a diffusion plate at a certain distance above the LED light source array, and use the diffusion plate to turn the point light source into a surface light source;

(2) A light source array composed of conventional LED chips is used, and a lens is installed on each LED chip, so that the light emitted by the LED lamp beads passes through the lens, and then the light is transmitted through the air layer between the lens and the diffuser plate to a certain extent. The light intensity is superimposed and then irradiated on the diffuser plate, thereby turning the point light source into a surface light source;

(3) Using a conventional LED chip light source array, the surface of the LED light source array is directly coated with silica gel and phosphor powder to form a light-guiding medium layer, so that the point light source can be transformed into a surface light source.

There are certain disadvantages or limitations in the above methods:

(1) For the first method: as shown in Figures 3 and 4, the light output angle of conventional LED light sources can reach up to about 120°, and there must be a relatively large distance between the LED light source 91 and the diffuser plate 92 to achieve a more uniform mixing. Lighting effect, the entire surface light emitting module is usually very thick, and generally can only be used in the lighting industry, such as panel lights, the application is very limited.

(2) For the second method: as shown in Figures 5 and 6, the light emitting angle after the lens 3 is superimposed on the conventional LED light source 91 can reach 135°. Although it increases the light emitting angle, and the top surface light is greatly reduced, it can A relatively uniform light mixing effect can be achieved within a relatively shorter distance, but due to the need to use secondary optical lenses, there must also be a certain distance between the diffuser plate 92 and the secondary optical lens 93, although compared with the thickness of the first method It has been reduced, but the surface-emitting module cannot achieve the ultra-thin effect.

(3) For the third method, as shown in Figure 8, a phosphor layer 94 is coated on the surface of a light source array composed of several LED chips 91, which slightly increases the lateral propagation and light mixing of white light; but from the optical theory, We can find that when the blue light is transmitted in the waveguide containing the phosphor, the intensity of the blue light as the excitation light will decrease rapidly due to the absorption and irregular scattering of the phosphor. As shown in Figure 9, taking a point light source as an example, when its light intensity is transmitted in a waveguide containing phosphor powder, the intensity is numerically inversely proportional to the cube of the distance; as shown in Figure 10, the light intensity of a line light source is When transmitting in a waveguide containing phosphor, the intensity is numerically inversely proportional to the square of the distance; as shown in Figure 11, when the light intensity of a surface light source is transmitted in a waveguide containing phosphor, the intensity is numerically inversely proportional to the distance.

Using the surface light sources of the first and second methods, due to the limitation of the light emitting angle of the LED chip, not only is it easy to form a dark area and the uniformity of light mixing is poor, but the entire direct-type surface-emitting module is also relatively thick. If you want to reduce the entire surface-emitting module The thickness can only be achieved by reducing the spacing between adjacent LED chips (see Figure 7), but the number of required LED chips increases squarely, and the cost increases significantly.

Using the surface light source in the third way, although the problem of module thickness is solved, the following problems still exist:

On the one hand, the light emission angle of the LED chip is limited, so that the light emitted by the LED chip is not conducive to the lateral transmission in the phosphor layer, and the lateral transmission effect is limited;

On the other hand, due to the serious attenuation of the white light obtained by mixing the blue light to excite the phosphor powder during the propagation of the light guide medium, the blue light that excites the phosphor powder attenuates, so the intensity of the blue light decreases, and the intensity of the lateral propagation along the waveguide direction decreases; the brightness of the chip is not uniform , The light mixing effect is poor, resulting in uneven brightness of the entire surface of the surface light source. Therefore, the arrangement of chips is relatively dense, which generally limits the arrangement of LED chips with a larger pitch.

To sum up, we need to develop a fluorescent lamp that can increase the light output angle of the light source, improve the light mixing effect, avoid uneven brightness, and reduce the overall thickness.

Contents of the invention

The technical problem to be solved by the utility model is to provide a fluorescent lamp that can increase the light emitting angle of the light source, improve the light mixing effect, avoid uneven brightness and reduce the overall thickness.

In order to solve the above technical problems, the technical solution of the present utility model is: a fluorescent lamp, the innovation point of which is that it includes a lamp tube and a surface light source module arranged in the lamp tube; the surface light source module includes a base plate, a large Angle light source, high refractive index transparent waveguide layer and diffusion film layer, the substrate is provided with a number of large angle light sources, and the substrate is also provided with a high refractive index transparent waveguide layer covering the large angle light source, and the high refractive index The height of the transparent waveguide layer is equal to or higher than the height of the light source with a large angle, and the upper surface of the high refractive index transparent waveguide layer is also provided with a diffusion film layer; the refractive index of the high refractive index transparent waveguide layer is greater than that of the lower surface of the diffusion film layer the refractive index.

Further, the lamp tube is in the shape of a strip or a ring.

Further, the substrate is a plurality of discontinuous strip substrates arranged at intervals, and the large-angle light-emitting light sources are correspondingly arranged on the strip substrates.

Further, the large-angle light-emitting light source includes an LED chip, the LED chip is a flip-chip structure, and the LED chip includes a P-GaN layer, a light-emitting layer, an N-GaN layer and a substrate arranged in sequence from bottom to top, and the The bottom surface of the LED chip is provided with a lower reflective layer, and the top and side surfaces of the LED chip are provided with a blue light re-excitation layer. The top surface of the blue light re-excitation layer is provided with an upper reflective layer. , the top surface of the upper reflection layer is a total reflection or partial reflection area.

Further, a middle reflective layer is provided on the top surface of the LED chip, and the middle reflective layer is a partial light emitting and partial reflection structure.

Further, the upper reflective layer contains granular fillers for refraction and reflection.

Further, a first dielectric transparent layer is provided on the top and side surfaces of the blue light reactivation layer, and the upper reflective layer is located on the upper surface of the first dielectric transparent layer.

Further, a second medium transparent layer is also provided between the first medium transparent layer and the reflective layer, and the refractive index of the first medium transparent layer is higher than that of the second medium transparent layer.

Further, a local scattering microstructure is added between the substrate and the high-refractive index transparent waveguide layer or between the high-refractive index transparent waveguide layer and the diffusion film layer.

The utility model has the advantages of:

(1) The fluorescent lamp of this utility model is used in the surface light source module structure of the fluorescent lamp, and the microstructure of the lower surface of the diffusion film layer has gaps, that is, the air layer accounting for most of the area of the diffusion film layer is used as a low refractive index layer. Furthermore, the white light emitted by the large-angle light source forms a waveguide in the high-refractive index transparent waveguide layer, which makes the point light source transform into a surface light source, increasing the lateral transmission of white light; at the same time, the large-angle light source used in the surface light source module, The reflective layer is directly placed on the top and bottom of the flip-chip LED chip. When the light emitted by the LED chip is continuously reflected by the upper reflective layer and the lower reflective layer, due to the existence of the blue light re-excitation layer, for the conventional blue light LED chip, it can be The reflected blue light is further excited through the blue light re-excitation layer (ie, phosphor layer), and then further mixed to obtain white light; The absorption rate in the LED chip is low, and the blue light emitted by the LED chip itself has a shorter wavelength, the highest absorption rate, and the absorption is the most serious; and in the utility model, the upper reflective layer and the blue light are creatively set above the LED chip at the same time. The re-excitation layer uses the blue light reflected by the upper reflective layer to be re-excited by the blue light re-excitation layer, and then further mixed to obtain white light, and the white light is much less absorbed than the blue light; on the basis of realizing large-angle light output, avoid light The attenuation; therefore, by using the fluorescent lamp made of the surface light source module, the light mixing effect can be effectively improved, uneven brightness can be avoided, and the overall thickness can be reduced;

(2) In this utility model, in the surface light source module, a local scattering microstructure area is added between the substrate and the high-refractive index transparent waveguide layer, or between the high-refractive index transparent waveguide layer and the diffusion film layer, avoiding the traditional The LED lamps without diffusion film or the clusters of particles on the surface of the traditional diffusion film present an uneven diffusion effect, avoiding obvious dark areas, and achieving a uniform diffusion effect of mixed light;

(3) In the present utility model, the setting of the medium transparent layer increases the light emitting angle of the LED chip, which is beneficial to guide the light to the high refractive index transparent waveguide layer, increases the light emitting angle, and further improves the light mixing effect.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

Fig. 1 is a structural schematic diagram of a traditional front-mounted LED with a reflector structure.

FIG. 2 is a schematic structural diagram of a conventional flip-chip LED with a reflector structure.

Figure 3 is a test chart of the light output angle of a traditional LED light source.

Fig. 4 is a schematic diagram of light intensity superimposition in the first way in a traditional direct-type surface-emitting module.

Figure 5 is a test diagram of the light output angle after the traditional LED light source is added with a lens.

Figure 6 is a schematic diagram of light intensity superposition using LED light sources plus lenses in a traditional direct-type surface-emitting module.

Fig. 7 is a schematic diagram of another light intensity superimposition method using closely arranged LED light sources plus lenses in a traditional direct-surface light-emitting module.

FIG. 8 is a schematic diagram of a method of adding phosphor powder to an LED light source array in a traditional direct-type surface-emitting module.

FIG. 9 is a schematic diagram of loss of light intensity of a point light source for a waveguide containing phosphor powder.

Fig. 10 is a schematic diagram of loss of light intensity of a line light source for a waveguide containing phosphor powder.

Fig. 11 is a schematic diagram of loss of light intensity of a surface light source by a waveguide containing phosphor powder.

Fig. 12 is a structural schematic diagram of the utility model fluorescent lamp.

FIG. 13 is a schematic structural diagram of the surface light source module of the first embodiment in FIG. 12 .

FIG. 14 is a schematic structural view of a large-angle light emitting light source according to the first embodiment of the present invention.

Fig. 15 is a light emitting angle test diagram of the large-angle light emitting light source of the first embodiment of the present invention.

FIG. 16 is another structural schematic diagram of the surface light source module of the first embodiment in FIG. 12 .

FIG. 17 is a schematic structural diagram of the surface light source module of the second embodiment in FIG. 12 .

FIG. 18 is a schematic structural view of a large-angle light-emitting light source according to the second embodiment of the present invention.

Fig. 19 is another structural schematic diagram of the LED chip in the present invention.

Detailed ways

The following embodiments can enable those skilled in the art to understand the utility model more comprehensively, but the utility model is not limited to the scope of the described embodiments.

Example 1

The fluorescent lamp of this embodiment, as shown in FIG. 12 , includes a long light tube 2 and a surface light source module 1 disposed inside the long light tube 2 .

In this embodiment, the specific structure of the surface light source module 1, as shown in FIG. The angle light source 12 is also provided with a high refractive index transparent waveguide layer 13 covering the large angle light source 12 on the substrate 11, and the height of the high refractive index transparent waveguide layer 13 is equal to or higher than the height of the large angle light source 12. The upper surface of the refractive index transparent waveguide layer 13 is also provided with a diffusion film layer 14 ; the refractive index of the high refractive index transparent waveguide layer 13 is greater than that of the lower surface of the diffusion film layer 14 .

This embodiment is used for the large-angle light-emitting light source 12 of the surface light source module 1. As shown in FIG. 14, it includes an LED chip 121. P-GaN layer, luminescent layer, N-GaN layer and substrate, and the lower reflective layer is set on the bottom surface of the LED chip 121, and the blue light re-excitation layer 122 is arranged on the top surface and the side of the LED chip 121, and the blue light re-excitation layer The top surface of 122 is provided with an upper reflective layer 123, the four sides of the blue light re-excitation layer 122 are all light output areas, and the top surface of the upper reflective layer 123 is a total reflection or partial reflection area.

During specific implementation, the upper reflective layer 123 contains granular fillers for refraction and reflection.

Taking a large-angle light source with a semi-transparent and semi-reflective top surface reflection structure as an example, as shown in Figure 15, this structure successfully changes the main energy angle of the main light-emitting direction of the LED light source with a normal Lambertian light structure from directly above 0° translates to plus or minus 30° all around. Secondly, it can be seen from the light intensity distribution that the luminous light intensity is evenly distributed throughout the entire luminous angle. Even in the large angle range of plus or minus 85°, the luminous light intensity is still about 64% of the peak light intensity. In an LED light source with a normal Lambertian light structure, if its light output angle is 120°, that is to say, when it is at plus or minus 60°, its light output intensity is only half of the peak value (see Figure 3). However, in this patent, the translucent and semi-reflective top surface reflection structure is used to emit light at a large angle. In the structure of the light source, the light intensity is still 64% of the peak light intensity even within the large angle range of plus or minus 85°.

As a more specific implementation of this embodiment:

In this embodiment, the shape of the lamp tube is not limited to a strip shape, and may also be a ring shape.

A local scattering microstructure is added between the substrate 11 and the high refractive index transparent waveguide layer 13 or between the high refractive index transparent waveguide layer 13 and the diffusion film layer 14 .

The diffusion particles of the local scattering microstructure can adopt a spherical structure, and its function is similar to that of a microlens. Microstructures include holograms, cylindrical lenses, microlens arrays, and stretchable diffraction gratings. can be achieved by using squeeze roll imprinting, diffusion lithography, thermal embossing, self-assembly, and isotropic

The localized scattering microstructure is realized on the surface of the diffusion film by a permanent etching method. When the light passes through these particles, it is focused and then scattered to a certain range of outgoing angles, which has the function of enhancing the brightness of the outgoing light. In addition, the difference between the diameter of the diffusing particles and the refractive index of the film-forming resin also ensures that the light will not go out directly from the diffusing film, providing a uniform light mixing effect and uniform brightness. The diffusion film with scattering microstructures involved in the present invention uses the refraction and reflection of light by surface periodic or randomly distributed microstructures to modulate the optical state of incident light. The surface light source module structure obtained by using this kind of light diffusion film with local scattering microstructure has the advantages of wide viewing angle, high transmittance, uniform light mixing, and the like.

The parameters of the surface light source module prepared by using the large-angle light source in Example 1 and the traditional direct-type backlight module are compared as follows:

6-inch mobile phone backlight application case

luminous area main energy direction Beam angle Module thickness gap Number of light source particles (pieces) Embodiment 1 (with fluorescent layer without transparent layer) 132.48mm*74.52mm +60° and -60° 170° 1mm 6mm 241 COB (Figure 6) 132.48mm*74.52mm 0° (directly above) ~120° 1mm 2mm 2416

Conclusion: It can be seen from the above table that under the premise that the area of the light-emitting area is the same and the thickness of the backlight module is the same, in this embodiment, due to the use of a large-angle four-sided light source to shift the direction of the main luminous energy from directly above to the side, At the same time, the luminous angle is as high as 170°. Under the premise of ensuring the same light mixing effect, the distance between adjacent light sources is effectively increased, and the number of light source particles is greatly reduced.

In this embodiment, the substrate 11 is a transparent flexible substrate, specifically PI board, PET board, PEV board, or the substrate 11 is a metal rigid board, specifically an aluminum board, a thin copper board, or a ceramic board. The substrate 11 adopts a flexible transparent or translucent substrate, and the circuit on the substrate 11 adopts a transparent conductive layer, such as ITO, graphene, which is flexible and bendable, so that the surface light source module can be further optimized to about 1mm, as thin as a sheet of paper .

As shown in FIG. 16 , the substrate 11 is a plurality of discontinuous strip-shaped substrates arranged at intervals, and the large-angle light-emitting light sources are correspondingly arranged on the strip-shaped substrates.

Example 2

The fluorescent lamp of this embodiment is basically the same as that of Embodiment 1. As shown in Figure 12, they all include a surface light source module 1, a frame 2, a lampshade 3 and a cable assembly 4. 3 is covered on the surface light source module 1 and detachably connected with the frame 2, and the surface light source module 1 is electrically connected with the cable assembly 4.

In this embodiment, the specific structure of the surface light source module 1, as shown in FIG. The angle light source 12 is also provided with a high refractive index transparent waveguide layer 13 covering the large angle light source 12 on the substrate 11, and the height of the high refractive index transparent waveguide layer 13 is equal to or higher than the height of the large angle light source 12. The upper surface of the refractive index transparent waveguide layer 13 is also provided with a diffusion film layer 14 ; the refractive index of the high refractive index transparent waveguide layer 13 is greater than that of the lower surface of the diffusion film layer 14 .

The difference is that this embodiment is used for the large-angle light emitting light source 12 of the surface light source module 1, as shown in FIG. The P-GaN layer, the light emitting layer, the N-GaN layer and the substrate are set, and the lower reflective layer is set on the bottom surface of the LED chip 121, and the blue light re-excitation layer 122 is arranged on the top surface and the side surface of the LED chip 121, and the blue light re-excitation The top surface of the layer 122 is provided with an upper reflective layer 123, and a layer of medium transparent layer 124 is provided on the top surface and side surfaces of the blue light re-excitation layer 122, and the upper reflective layer 123 is set on the upper surface of the medium transparent layer 124; the blue light re-excitation layer 122 The four sides of the upper reflective layer 123 are total light emitting areas, and the top surface of the upper reflective layer 123 is a total reflective or partial reflective area.

The LED chip used in the large-angle light source of Embodiment 1 and Embodiment 2, a more specific embodiment, as shown in Figure 19, the top surface of the LED chip 121 is provided with a middle reflective layer 125, and the middle reflective layer 125 is a part The light emitting part reflects the structure.

The basic principles and main features of the utility model and the advantages of the utility model have been shown and described above. Those skilled in the art should understand that the utility model is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model The new model also has various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model. The scope of protection required by the utility model is defined by the appended claims and their equivalents.

Claims (9)

1. A fluorescent lamp, characterized in that: it includes a lamp tube and a surface light source module arranged in the lamp tube; the surface light source module includes a substrate, a large-angle light source, a high refractive index transparent waveguide layer and a diffusion film layer, the substrate is provided with a number of large-angle light-emitting light sources, and a high-refractive-index transparent waveguide layer covering the large-angle light-emitting light source is also arranged on the substrate, and the height of the high-refractive index transparent waveguide layer is equal to or higher than that of the large-angle light-emitting light source The height of the high refractive index transparent waveguide layer is also provided with a diffusion film layer on the upper surface; the refractive index of the high refractive index transparent waveguide layer is greater than the refractive index of the lower surface of the diffusion film layer. 2. The fluorescent lamp according to claim 1, wherein the lamp tube is in the shape of a strip or a ring. 3 . The fluorescent lamp according to claim 1 , wherein the substrate is a plurality of discontinuous strip-shaped substrates arranged at intervals, and the large-angle light-emitting light sources are correspondingly arranged on the strip-shaped substrates. 4 . 4. The fluorescent lamp according to claim 1, characterized in that: the large-angle light-emitting light source includes an LED chip, the LED chip is a flip-chip structure, and the LED chip includes a P-GaN layer arranged in sequence from bottom to top, a light emitting layer, N-GaN layer and substrate, and a lower reflective layer is set on the bottom surface of the LED chip, a blue light re-excitation layer is provided on the top and side surfaces of the LED chip, and an upper reflective layer is provided on the top surface of the blue light re-excitation layer, the The four sides of the blue light re-excitation layer are all light output areas, and the top surface of the upper reflection layer is a total reflection or partial reflection area. 5. The fluorescent lamp according to claim 4, characterized in that: a middle reflective layer is provided on the top surface of the LED chip, and the middle reflective layer is a partial light-emitting part reflective structure. 6. The fluorescent lamp according to claim 4, characterized in that: the upper reflection layer contains granular fillers for refraction and reflection. 7. The fluorescent lamp according to claim 4, 5 or 6, characterized in that: the top and side surfaces of the blue light reactivation layer are provided with a first medium transparent layer, and the upper reflective layer is located on the first medium transparent layer of the upper surface. 8. The fluorescent lamp according to claim 7, characterized in that: a second medium transparent layer is arranged between the first medium transparent layer and the reflective layer, and the refractive index of the first medium transparent layer is higher than that of the second medium transparent layer Transparent layer refractive index. 9. The fluorescent lamp according to claim 1, characterized in that a local scattering microstructure is added between the substrate and the high-refractive index transparent waveguide layer or between the high-refractive index transparent waveguide layer and the diffusion film layer.