CN215174228U - LED lamp panel and backlight module using same - Google Patents

Abstract

The utility model provides a LED lamp plate and use its backlight unit, above-mentioned LED lamp plate, including the base plate, install the light emitting component on the base plate, its characterized in that: the light-emitting device also comprises a first light diffusion layer, a second light diffusion layer and a third light diffusion layer; the first light scattering layer covers the light-emitting surface of the light-emitting element, the second light scattering layer covers the light-emitting surface of the first light scattering layer, and the third light scattering layer covers the light-emitting surface of the second light scattering layer; the refractive index of the first light diffusion layer is n1, the refractive index of the second light diffusion layer is n2, the refractive index of the third light diffusion layer is n3, n1 is more than n2, and n3 is more than n 2. The utility model discloses a design the refracting index size relation of each diffusion layer, can enough restrain the light quantity and assemble at the top of light source, still be favorable to fully dispersing of light quantity to the light-emitting degree of consistency of LED lamp plate has been improved remarkably.

Description

LED lamp panel and backlight module using same

Technical Field

The utility model belongs to the technical field of show, especially, relate to a LED lamp plate and use its backlight unit.

Background

An LED backlight generally refers to a process or a product for forming an LED surface light source by assembling an LED point light source on a substrate, and a common LED backlight is a surface light source for converting an LED point light source into uniform light emission by a backlight module including an LED lamp panel, a reflection mechanism, and an optical film. The light-emitting uniformity is an important quality index of the backlight module technology, the light-emitting uniformity of the backlight module is improved, the full utilization of light energy is facilitated, and the light-emitting efficiency is improved. On general LED lamp plate, the LED pointolite is the matrix arrangement, has the gap between the adjacent pointolite, has LED to the luminous discontinuity of LED lamp plate, forms obvious dark space in the clearance department of pointolite usually, causes the luminous effect of bright dark inequality to appear in the LED lamp plate, so not only influences luminous display effect, has also caused the waste of the light energy.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a LED lamp plate and use its backlight unit to improve LED display device's light-emitting homogeneity.

According to the utility model discloses an aspect provides a LED lamp plate, include the base plate, install the light emitting component on the base plate, its characterized in that: the light-emitting device also comprises a first light diffusion layer, a second light diffusion layer and a third light diffusion layer; the first light scattering layer covers the light-emitting surface of the light-emitting element, the second light scattering layer covers the light-emitting surface of the first light scattering layer, and the third light scattering layer covers the light-emitting surface of the second light scattering layer; the refractive index of the first light diffusion layer is n1, the refractive index of the second light diffusion layer is n2, the refractive index of the third light diffusion layer is n3, n1 is more than n2, and n3 is more than n 2. The utility model discloses a design the refracting index size relation of each diffusion layer, can restrain the light quantity and assemble at the top of light source, promote the reasonable grading of light source, be favorable to fully dispersing of light quantity to the light-emitting degree of consistency of LED lamp plate has been improved remarkably.

Preferably, the first light scattering layer is formed by a first light scattering element, the third light scattering layer is formed by a second light scattering element, the first light scattering element covers the light emitting surface of the light emitting element, the second light scattering element covers the outside of the first light scattering element, and an air gap is formed between the first light scattering element and the second light scattering element and serves as the second light scattering layer. The first light dispersion element and the second light dispersion element may be made of a resin material. The use of an air gap as the second light-diffusing layer has the following advantages: (1) the second light scattering layer is formed without an additional processing technology, so that the thickness of the second light scattering layer is not limited by the processing technology of the device, and the device is prevented from increasing unnecessary thickness; (2) the second light scattering layer is arranged without adopting extra materials, so that the product is light and handy, and the cost can be saved; (3) the air gap is arranged between the first light scattering element and the second light scattering element, so that the requirements on the processing precision and the alignment precision of the first light scattering element and the second light scattering element can be correspondingly reduced (if the first light scattering element and the second light scattering element need to be tightly attached without leaving a gap, the requirements on the contact surface structure and the positioning and mounting matching degree of the first light scattering element and the second light scattering element are very high), the processing and assembling difficulty of the device is reduced, and the production and assembly efficiency is improved.

Preferably, the first light scattering element is optical glue, and the light emitting element is fixedly packaged on the substrate by the first light scattering element. The first light scattering element seals the whole light emitting element, and can play a role in dimming, fixing and sealing the light emitting element, protect the light emitting element from being oxidized and prolong the service life of the light emitting element.

Preferably, the first light scattering element is a concave-convex lens, and the light emergent surface of the first light scattering element is a convex surface. The texture of the light emitting surface of the concave-convex lens is uniform, so that the light can be diffused, and the light emitting uniformity can be improved.

Preferably, the first light dispersing element has a radius value greater than the height value of said first light dispersing element. By limiting the specification of the first light scattering element, the cross section profile of the first light scattering layer is a minor arc, so that the light quantity is favorably inhibited from being converged at the top of the light source, and the light emitting uniformity is improved.

Preferably, the second light dispersion element is detachably mounted on the base plate. The second light scattering element can be detached at any time, so that the repair work in the machining process is facilitated.

Preferably, the second light dispersing element comprises at least one segment-shaped concave-convex lens, and the light emitting surface of the concave-convex lens is a convex surface.

Preferably, the radius value of the concave surface of the meniscus constituting the second light dispersion element is larger than the height value of the concave surface of the meniscus. By limiting the specifications of the concave-convex lens forming the second light scattering element, the cross section profile of the second light scattering layer is a minor arc, light divergence is facilitated, and light emitting uniformity is improved.

Preferably, the second light dispersing element is a double-head lens formed by joining two concave-convex lenses, the joint of the concave-convex lenses enables the double-head lens to be of a structure with a concave middle, and the light emitting element is opposite to the joint of the concave-convex lenses. The second light scattering element is in a shape with a concave middle, so that the second light scattering element can achieve large-range light distribution, the batwing-shaped light distribution effect is realized, and the light emitting uniformity is improved.

Preferably, the light emitting element is a side-emitting light source, and in the operating state, light is emitted from a side surface of the light emitting element. The batwing-shaped light distribution effect is formed by restraining the light quantity right above the light emitting element, and the light emitting uniformity is improved.

Preferably, the light emitting element is mounted on the substrate by flip-chip mounting. The light quantity right above the light-emitting element can be restrained without arranging a special light-reflecting part on the light-emitting element, the processing steps of the light-emitting element are simplified, and the thickness of the light-emitting element is reduced.

According to the utility model discloses an aspect provides a backlight module, its characterized in that: the LED lamp panel comprises the LED lamp panel, a reflecting element and a diffusion film; a light-emitting element on the LED lamp panel and a layered structure formed by a first light-scattering layer, a second light-scattering layer and a third light-scattering layer which cover the light-emitting element are taken as a light source, and a light inlet hole matched with the light source is formed in the reflecting element; the reflecting elements are stacked on the LED lamp panel, the light sources penetrate through the light inlet holes of the reflecting elements in a one-to-one correspondence mode, and the diffusion films are stacked on the reflecting elements. The utility model provides a backlight module, the light-emitting is even, and processing is convenient, has the prospect of extensive popularization and application.

Drawings

Fig. 1 is a schematic structural view of a light-emitting element of embodiment 1;

FIG. 2 is a diagram showing the propagation path of light when the light source of embodiment 1 emits light;

fig. 3 is a schematic structural view of the LED lamp panel of embodiment 1;

FIG. 4 is a schematic view of the propagation path of a light ray when the cross-sectional profile of the first diffusion layer is simulated as a minor arc;

FIG. 5 is a schematic view showing a propagation path of light rays when the cross-sectional profile of the first light diffusion layer is simulated as a major arc;

FIG. 6 is a schematic view showing another propagation path of light rays when the cross-sectional profile of the first light diffusion layer is simulated as a major arc;

FIG. 7 is a schematic view of the propagation path of a light ray when the cross-sectional profile of the second light-diffusing layer is simulated as a minor arc;

FIG. 8 is a schematic view showing the propagation path of light rays when the cross-sectional profile of the second light-diffusing layer is simulated as a major arc;

fig. 9 is a schematic structural view of a light-emitting element of embodiment 2;

FIG. 10 is a diagram showing the transmission path of light when the light source of embodiment 2 emits light;

fig. 11 is a schematic structural view of the LED lamp panel of embodiment 2;

FIG. 12 is a diagram illustrating components included in the backlight module.

The correspondence of the various components to the numbers in the drawings is as follows: 1. the light source, 11, the light emitting element, 12, the first light diffusion layer, 121, the first light diffusion layer, 13, the second light diffusion layer, 14, the third light diffusion layer, 141, the second light diffusion element, 2, the substrate, 3, the emitting element, 31, the light inlet hole, 4, the diffusion film, 51, the first dimming region, 52, the second dimming region, 53, the third dimming region.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, back, horizontal, vertical … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly. In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

Example 1

An LED lamp panel comprises a substrate 2 and a light emitting element 11 installed on the substrate 2. A reflective layer, such as white ink, is provided on the substrate 2; a windowing bonding pad and a circuit layer are arranged. On the substrate 2, light emitting elements 11 are arranged in a matrix. At the window opening position of the substrate 2, the light emitting element 11 is electrically connected to a wiring layer formed on the substrate 2 via an electric wire, flip-chip mounted on the substrate 2, and light is emitted from the side surface of the light emitting element 11 in an energized state. The light emitting element 11 is packaged by using a silica gel material, the silica gel material is cured and molded to form a transparent hemispherical structure, the hemispherical structure is the first light scattering element 121 in this embodiment, the first light scattering element 121 formed thereby is a concave-convex lens, the inside of the first light scattering element 121 is the first light scattering layer 12, the inside of the first light scattering layer 12 is filled with light conversion particles, the light conversion particles are used for converting blue and violet light emitted by the light emitting element 11 into white light, in practical application, other diffusion particles with a rendering effect and the like can be filled in the first light scattering layer 12 according to needs, so that the light scattering effect of the first light scattering layer 12 is enhanced, and the light emitting uniformity is improved. Under the fixing and protecting effects of the first light scattering element 121, the light emitting element 11 is not easily detached and oxidized. A transparent, hollow, spherical segment-shaped concave-convex lens is molded in a mold using a resin material, the hemispherical concave-convex lens is used as the second light dispersion element 141 in the present embodiment, the second light dispersion element 141 is covered outside the first light dispersion element 121, and the second light dispersion element 141 is detachably attached to the substrate 2. The inner surface radius value of the second light dispersion element 141 is larger than the outer surface radius value of the first light dispersion element 121, so that an air gap is formed between the first light dispersion element 121 and the second light dispersion element 141, the air gap serves as the second light dispersion layer 13 of the present embodiment, and the inside of the second light dispersion element 141 is the third light dispersion layer 14 of the present embodiment. In the present embodiment, the refractive index of the first diffusion layer 12 is n1, the refractive index of the second diffusion layer 13 is n2, the refractive index of the third diffusion layer 14 is n3, n1 > n2, and n3 > n 2. The radius value of the first light dispersion element 121 is larger than the height value of the first light dispersion element 121, and the radius value of the concave surface of the second light dispersion element 141 is larger than the height value of the concave surface of the second light dispersion element 141. A layered structure composed of each light emitting element 11 and the first, second and third light scattering layers 12, 13 and 14 covering the light emitting element is used as a light source 1, and the light source 1 and the LED lamp panel on which the light source 1 is mounted are shown in fig. 1 to 3, respectively.

The influence of the refractive index and the element size value set in the embodiment on the propagation effect of the optical path is analyzed according to fig. 4-8:

(1) in order to simulate the propagation of light in the light source 1 prepared in this embodiment, it is set in fig. 4 to 6 that the refractive index (corresponding to n1) of the first dimming region 51 is greater than the refractive index (corresponding to n2) of the second dimming region 52, and the light enters the second dimming region 52 from the first dimming region 51 in the horizontal direction. Since n1 > n2, when light reaches the interface between the first dimming region 51 and the second dimming region 52, the light enters the optically thinner medium from the optically denser medium, and according to the total reflection principle of the light: light rays having an incident angle greater than arcsin (n2/n1) continue to propagate in the first light diffusion region 12 in the form of total reflection, light rays having an incident angle smaller than arcsin (n2/n1) enter the second light diffusion region 13, and the refraction angle of the light rays is greater than the incident angle, that is, the incident light rays are closer to the normal. If the cross-sectional profile of the first dimming region 51 is a minor arc, as shown in fig. 4, the light entering the second dimming region 52 travels obliquely downward, which is beneficial to inhibiting the light from converging on the top of the light source 1 and improving the uniformity of the emitted light. If the cross-sectional profile of the first dimming region 51 is a major arc: part of the light enters the second light adjusting region 52 along the horizontal direction higher than the center of the first light scattering region 51, and after refraction, the light travels obliquely upwards, as shown in fig. 5, which may cause the light to converge at the top of the light source 1, and is not favorable for uniform light emission; part of the light enters the second dimming region 52 along the horizontal spherical radius direction of the first light dispersion region 51, and the total reflection phenomenon occurs due to the incident direction perpendicular to the incident surface, as shown in fig. 6. In summary, in the present embodiment, the first light scattering element 121 is set to have a radius value larger than a height value thereof, so as to ensure that the cross-sectional profile of the first light scattering layer 12 is a minor arc, which is beneficial to improving the uniformity of the emitted light.

(2) Based on the above analysis, in the light source 1 provided in the present embodiment, the light enters the second light diffusion layer 13 along the obliquely lower direction, and in order to simulate the propagation of the light in the light source 1 prepared in the present embodiment, it is set in fig. 7 and 8 that the refractive index (corresponding to n2) of the second light modulation region 52 is smaller than the refractive index (corresponding to n3) of the third light modulation region 53, and the light enters the third light modulation region 53 from the second light modulation region 52 along the obliquely lower direction. Since n3 > n2, when light reaches the interface between the second dimming region 52 and the third dimming region 53, the light enters the optically dense medium from the optically thinner medium, and the refraction angle of the light is smaller than the incident angle, i.e. the refracted light is closer to the normal. If the cross-sectional profile of the second dimming region 52 is a minor arc, as shown in fig. 7, the light entering the third dimming region 53 travels obliquely upward, which is beneficial to light divergence and improves light uniformity. If the cross-sectional profile of the second dimming region 52 is a major arc, as shown in fig. 8, the light entering the third dimming region 53 travels obliquely downward, so that the amount of light is concentrated at the bottom of the light source 1, which is not favorable for light divergence. In summary, in the present embodiment, the second light scattering element 141 is set to have the radius value of the concave surface larger than the height value of the concave surface of the second light scattering element 141, so that the profile of the second light scattering layer 13 is ensured to be a minor arc, which is beneficial to improving the uniformity of the emitted light.

(3) As described above, the light diffusion medium of the second light diffusion layer 13 is air, the refractive index n2 of the second light diffusion layer 13 is smaller than the refractive index n3 of the third light diffusion layer 14, and when the light exits from the light exit surface of the third light diffusion layer, the light enters the air medium again, that is, the light enters the light-scattering medium again from the optically dense medium at this time, according to the total reflection principle of the light: the light with the incident angle larger than arcsin (n2/n3) still continues to propagate in the third light scattering region 14 in a total reflection mode, the light with the incident angle smaller than arcsin (n2/n3) can penetrate out of the third light scattering region 14, the refraction angle of the light is larger than the incident angle, namely the incident light is closer to the normal, and the light emergent angle of the light emitted from the third light scattering layer 14 can be concentrated at 40-50 degrees by adjusting the refractive index n3 of the third light scattering layer 14, so that reasonable light distribution is realized, and the light emergent uniformity is improved.

In the LED lamp panel of this embodiment, when the LED lamp panel is in the power-on state, the transmission route of the light emitted from the light emitting element 11 is as follows: the light is emitted from the side of the light emitting element 11, enters the first light scattering layer 12 from the concave surface of the first light scattering element 121, then passes out of the first light scattering layer 12 from the convex surface of the first light scattering element 121, enters the second light scattering layer 13, passes through the second light scattering layer 13, enters the third light scattering layer 14 from the concave surface of the second light scattering element 141, and finally passes out of the third light scattering layer 14 from the convex surface of the second light scattering element 141 to enter the external environment of the light source 1. Based on the above analysis, the propagation direction of the light inside the light source 1 is as shown by an arrow in fig. 2, and the composite light scattering layer structure with the refractive index fluctuating up and down between layers is arranged to change the propagation direction of the light many times, so that reasonable light distribution is realized, dark areas are avoided, and the light emitting uniformity is improved.

As shown in fig. 12, the backlight module is assembled by using the LED lamp panel, the reflective element 3 and the diffusion film 4 provided in this embodiment, the reflective element 3 of this embodiment is provided with a plurality of reflective cups corresponding to the light sources 1 on the LED lamp panel one to one, the bottom of each reflective cup is provided with a light incident hole 31, and the position of each light incident hole 31 also corresponds to the light sources 1 on the LED lamp panel one to one. The reflecting elements 3 are stacked on the LED lamp panel, so that the light sources 1 on the LED lamp panel correspondingly penetrate through the light inlet holes 31 one by one and extend into the reflecting cup, and then the diffusion film 4 is installed above the reflecting elements 3, so that the assembly of the backlight module is completed.

Example 2

An LED lamp panel comprises a substrate 2 and a light emitting element 11 installed on the substrate 2. A reflective layer, such as white ink, is provided on the substrate 2; a windowing bonding pad and a circuit layer are arranged. On the substrate 2, light emitting elements 11 are arranged in a matrix. At the window opening position of the substrate 2, the light emitting element 11 is electrically connected to a wiring layer formed on the substrate 2 via an electric wire, flip-chip mounted on the substrate 2, and light is emitted from the side surface of the light emitting element 11 in an energized state. The light emitting element 11 is packaged by using a silica gel material, the silica gel material is cured and molded to form a transparent hemispherical structure, the hemispherical structure is the first light scattering element 121 in this embodiment, the first light scattering element 121 formed thereby is a concave-convex lens, the inside of the first light scattering element 121 is the first light scattering layer 12, the inside of the first light scattering layer 12 is filled with light conversion particles, the light conversion particles are used for converting blue and violet light emitted by the light emitting element 11 into white light, in practical application, other diffusion particles with a rendering effect and the like can be filled in the first light scattering layer 12 according to needs, so that the light scattering effect of the first light scattering layer 12 is enhanced, and the light emitting uniformity is improved. . Under the fixing and protecting effects of the first light scattering element 121, the light emitting element 11 is not easily detached and oxidized. The second light dispersing element 141 of this embodiment is a double-headed lens, and is specifically formed by joining two hollow transparent segment-shaped concave-convex lenses with the same shape, and a recess is formed at the joint of the concave-convex lenses, as shown in fig. 8. By using the double-head lens as the second light scattering element 141, large-scale light distribution is facilitated, the light distribution effect of the batwing type is realized, and the uniformity of emergent light is improved. The second light dispersion element 141 of the present embodiment is molded in a mold using a resin material. The second light dispersion element 141 is housed outside the first light dispersion element 121, the second light dispersion element 141 is detachably mounted on the substrate 2, and the light emitting element 11 faces the recess in the middle of the second light dispersion element 141. An air gap is formed between the first light dispersion element 121 and the second light dispersion element 141, the air gap serves as the second light dispersion layer 13 of the present embodiment, and the inside of the second light dispersion element 141 is the third light dispersion layer 14 of the present embodiment. In this embodiment, with the refractive index of the first diffusion layer being n1, the refractive index of the second diffusion layer being n2, and the refractive index of the third diffusion layer being n3, n1 > n2, and n3 > n 2. The first light dispersion element 121 has a radius value larger than a height value of the first light dispersion element 121, and the second light dispersion element 141 has a radius value of a concave surface of any one of the meniscus lenses larger than a height value of the concave surface thereof. Each light emitting element 11 and the layered structure formed by the first light scattering layer 12, the second light scattering layer 13 and the third light scattering layer 14 covering the light emitting element are taken as a light source 1, and the light source 1 and the LED lamp panel on which the light source 1 is mounted are respectively shown in fig. 9 to 11.

In the powered state of the LED lamp panel of this embodiment, the transmission route and the transmission direction of the light are similar to those of embodiment 1, as shown by the arrows in fig. 10.

As shown in fig. 12, the backlight module is assembled by using the LED lamp panel, the reflective element 3 and the diffusion film 4 provided in this embodiment, the reflective element 3 of this embodiment is provided with a plurality of reflective cups corresponding to the light sources 1 on the LED lamp panel one to one, the bottom of each reflective cup is provided with a light incident hole 31, and the position of each light incident hole 31 also corresponds to the light sources 1 on the LED lamp panel one to one. The reflecting elements 3 are stacked on the LED lamp panel, so that the light sources 1 on the LED lamp panel correspondingly penetrate through the light inlet holes 31 one by one and extend into the reflecting cup, and then the diffusion film 4 is installed above the reflecting elements 3, so that the assembly of the backlight module is completed.

Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the true spirit and scope of the present invention.

Claims (11)

1. The utility model provides a LED lamp plate, includes the base plate, installs light emitting component on the base plate, its characterized in that: the light-emitting device also comprises a first light diffusion layer, a second light diffusion layer and a third light diffusion layer;

the first light scattering layer covers a light-emitting surface of the light-emitting element, the second light scattering layer covers a light-emitting surface of the first light scattering layer, and the third light scattering layer covers a light-emitting surface of the second light scattering layer;

when the refractive index of the first light diffusion layer is n1, the refractive index of the second light diffusion layer is n2, and the refractive index of the third light diffusion layer is n 3: n1 > n2, and n3 > n 2.

2. The LED lamp panel of claim 1, wherein: the first light scattering layer is formed by a first light scattering element, the third light scattering layer is formed by a second light scattering element, the first light scattering element covers the light-emitting surface of the light-emitting element, the second light scattering element covers the outside of the first light scattering element, an air gap is formed between the first light scattering element and the second light scattering element, and the air gap is used as the second light scattering layer.

3. The LED lamp panel of claim 2, wherein: the first light scattering element is optical glue, and the light emitting element is fixedly packaged on the substrate through the first light scattering element.

4. The LED lamp panel of claim 3, wherein: the first light scattering element is a concave-convex lens, and the light emergent surface of the first light scattering element is a convex surface.

5. The LED lamp panel of claim 4, wherein: the first light dispersing element has a radius value greater than a height value of the first light dispersing element.

6. The LED lamp panel of claim 2, wherein: the second light dispersion element is detachably mounted on the base plate.

7. The LED lamp panel of claim 6, wherein: the second light scattering element comprises at least one segment-shaped concave-convex lens, and the light emergent surface of the concave-convex lens is a convex surface.

8. The LED lamp panel of claim 7, wherein: the radius value of the concave surface of the meniscus lens is greater than the height value of the concave surface of the meniscus lens.

9. The LED lamp panel of claim 7, wherein: the second astigmatism component is by two double-end lens that meniscus connects to form, meniscus's junction makes double-end lens is middle sunken structure, light emitting component just right meniscus's junction.

10. The LED lamp panel of claim 1, wherein: the light emitting element is a side light emitting source, and light is emitted from the side surface of the light emitting element in a working state.

11. A backlight module is characterized in that:

the LED lamp panel comprises the LED lamp panel according to any one of claims 1-9, a reflecting element and a diffusion film;

a light emitting element on the LED lamp panel and a layered structure formed by the first light scattering layer, the second light scattering layer and the third light scattering layer which cover the LED lamp panel are taken as a light source, and a light inlet hole matched with the light source is formed in the reflecting element;

the reflecting element is stacked on the LED lamp panel, the light sources penetrate through the light inlet holes of the reflecting element in a one-to-one correspondence mode, and the diffusion films are stacked on the reflecting element.

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