CN202813086U - LED (light emitting diode) backlight and display device - Google Patents

Abstract

The utility model provides an LED backlight source and a display device. The LED backlight source includes an LED lamp and a lens arranged in the light-emitting direction of the LED lamp. The lens includes a light-emitting surface and a light-incoming bottom surface. A light scattering layer is provided. The display device includes the LED backlight. The utility model is provided with a light scattering layer on the light incident bottom surface of the lens, which can scatter the light reflected to the light incident bottom surface of the lens through the light exit surface of the lens, reduces the light leakage of the lens, and improves the brightness of the LED backlight source. The utility model is also provided with a reflective layer on the light incident bottom surface, the reflective surface of the reflective layer faces the light exit surface, and the light incident on the light incident bottom surface of the lens is reflected by the reflective layer to the direction of the lens light exit surface, which further improves the utilization of the light source. efficiency.

Description

A kind of LED backlight source and display device

technical field

The utility model relates to the field of display technology, in particular to an LED backlight source and a display device with the backlight source.

Background technique

Liquid crystal display (LCD, Liquid Crystal Display) has been widely used due to its light weight, power saving, and no radiation. The liquid crystal display is a non-luminescent display device, which needs a backlight source to achieve the display function. The performance of the backlight directly affects the image quality of the LCD, and it can be said to be a very important component in the LCD module. LED backlights are widely used in liquid crystal displays due to their characteristics of wide color gamut, energy saving, environmental protection, and long life.

As shown in Figure 1, it is an existing LED backlight structure, the LED backlight includes an LED lamp 200, a lens 100, a printed circuit board 300 and a pillar 400, and the lens 100 is arranged on the light emitting direction of the LED lamp 200, as shown in FIG. As shown in the figure, the lens 100 is covered on the upper part of the LED lamp 200. The lens 100 includes a light-emitting surface and a light-incoming bottom surface 102. The printed circuit board 300 is electrically connected to the LED lamp for driving the LED lamp. The connection between the printed circuit board 300 and the lens 100 is They are connected by pillars 400. The structure of the LED backlight source achieves the effect of diverging and uniform light by adding an optical lens outside the LED lamp, and improves the brightness uniformity of the backlight source. However, when the LED backlight structure uses an optical lens, because part of the light is reflected by the upper surface of the lens, the direction of the light changes to the direction of the LED light, and the phenomenon that the light is emitted from the direction of the light incident bottom surface 102 occurs, that is, the LED light appears. light leakage phenomenon. As shown in Figure 2, it is the light path diagram of the LED backlight with this structure, combined with Figure 1 and Figure 2, because part of the light is emitted from the direction of the light incident bottom surface 102 of the lens, about 20% to 30% of the light The loss greatly reduces the light source utilization rate of the LED backlight.

Utility model content

The technical problem to be solved by the utility model is that part of the light in the LED backlight is emitted from the direction of the light-incident bottom surface of the lens, causing light leakage from the lens and reducing the brightness of the LED backlight.

In order to solve the above technical problems, the utility model provides an LED backlight, which includes an LED lamp and a lens arranged in the light emitting direction of the LED lamp. The lens includes a light-emitting surface and a light-incoming bottom surface. scattering layer.

The light scattering layer is integrally formed with the lens.

The light scattering layer is a film layer of diffusing particles.

The light scattering layer is arranged on the side of the light incident bottom surface close to the LED lamp.

A reflective layer is also provided on the light-incident bottom surface, and the reflective surface of the reflective layer faces the light-exit surface.

The reflective layer is integrally formed with the lens.

A light-scattering layer and a reflective layer are sequentially provided on the side of the light-incident bottom surface close to the LED lamp.

A groove is provided on the light incident bottom surface of the lens, and at least a part of the LED lamp is located in the groove.

The LED backlight source also includes a printed circuit board for driving LED lamps, and the printed circuit board is provided with pillars for supporting the lens.

The utility model also provides a display device comprising the above-mentioned LED backlight source.

The beneficial effects of the above-mentioned technical solution of the utility model are as follows: the LED backlight is provided with a scattering layer on the light incident bottom surface of the lens, which can scatter the light reflected by the lens to the light incident bottom surface, thereby achieving the diffusion effect of light and reducing the The lens leaks light, which improves the brightness of the LED backlight. The utility model is also provided with a reflective layer on the bottom surface of the light incident, and the reflective surface of the reflective layer faces the light exit surface, so that the light incident on the light incident bottom surface of the lens is reflected from the reflective layer to the light exit surface of the lens, further improving the efficiency of the light source. usage efficiency.

Description of drawings

FIG. 1 is a schematic structural diagram of an existing LED backlight source;

Fig. 2 is the optical path diagram of existing LED backlight emitting light;

Fig. 3 is the structural representation of the first embodiment of the utility model;

Fig. 4 is a schematic structural diagram of a scattering layer according to an embodiment of the present invention;

Fig. 5 is the structural representation of the second embodiment of the utility model;

FIG. 6 is a light path diagram of the LED backlight in FIG. 5 emitting light.

Detailed ways

In order to make the technical problems, technical solutions and advantages to be solved by the utility model clearer, the following will describe in detail with reference to the drawings and specific embodiments.

It should be noted that the embodiments of the present invention all take liquid crystal display as an example for illustration, but it is not limited thereto, as long as the LED backlight provides light source for display, all devices are within the scope of protection of the present invention.

As shown in FIG. 3 , it is a structural schematic diagram of the first embodiment of the present utility model. The LED backlight includes an LED lamp 200 and a lens 100 arranged in the light emitting direction of the LED lamp. The lens 100 includes a light incident bottom surface close to the LED lamp. 102 and away from the light emitting surface 103 of the LED lamp, the light emitted by the LED lamp 200 enters the lens from the light incident bottom surface 102 and exits from the light emitting surface 103 to provide a light source for the liquid crystal display. The backlight of the embodiment of the present utility model also includes a light scattering layer 500 arranged on the light-incident bottom surface, which can scatter the light reflected by the light-exit surface 103 and directed to the light-incidence bottom surface 102, so that part of the light reflected by the light-exit surface 103 The light is re-scattered to the light exit surface 103, reducing the light transmitted from the light entrance bottom surface 102, and improving the utilization efficiency of the light source.

In a specific embodiment of the present invention, the light-scattering layer 500 can be integrally formed with the lens, so that the light-incident bottom surface of the lens has a scattering function, or it can be provided separately. When installed separately, it can be attached to the upper surface and/or lower surface of the light incident bottom surface of the lens, as shown in Figure 3, that is, it is set on the side of the light incident bottom surface 102 close to the LED light. The description is made by taking the light scattering layer disposed on the side of the light incident bottom surface 102 close to the LED lamp as an example.

The light scattering layer 500 of the present invention can have various structures, as long as it can scatter light.

Preferably, the scattering layer 500 is a film layer of diffusing particles.

As shown in FIG. 4 , which is a schematic structural diagram of a scattering layer according to an embodiment of the present invention, the diffusion particle film layer includes a substrate 501 and scattering particles 502 disposed on the substrate 501 . The LED backlight uses a plurality of scattering particles to scatter the light reflected by the light-emitting surface 103 towards the light-incident bottom surface 102 of the lens, so that part of the light is emitted toward the light-emitting surface of the lens again.

In a specific application, the scattering particles 502 are distributed on the substrate 501, and the scattering particles can be arranged on the substrate 501 by coating or extruding, and the substrate 501 is attached (the arrangement method is not limited to one of attachment, and can also be pasting, etc. ) On the side of the light-incident bottom surface of the lens close to the LED lamp, the scattering particles 502 are fixed on the light-incident bottom surface of the lens through the substrate 501 .

The scattering particles in this embodiment can be made of materials such as PC, PS, PMMA, PET (Polyethyleneterephthalate, polyethylene terephthalate).

The substrate 501 in this embodiment can be made of various substances, such as resin, plastic, and the like.

Preferably, the substrate is resin, and optical scattering particles of different sizes are fused into the resin to achieve light scattering, and the resin is attached to the light-incident bottom surface of the lens to realize the light-scattering layer and the lens entrance. Fixed connection on bare bottom.

The light scattering layer of this embodiment uses scattering particles to scatter the received light toward the light-emitting surface of the lens, reducing the emission of light from the light-receiving bottom surface of the lens, thereby improving the brightness of the light source.

As shown in FIG. 5 , it is a structural schematic diagram of the second embodiment of the present invention. The LED backlight of this embodiment includes an LED lamp 200 and a lens 100 arranged in the light emitting direction of the LED lamp 200. The lens 100 includes a light-emitting surface. 103 and the light incident bottom surface 102, the light incident bottom surface 102 is provided with a light scattering layer 500, and the light incident bottom surface is also provided with a reflective layer 600, and the reflective surface of the reflective layer 600 faces the light exit surface. The light-incident bottom surface 102 of the lens 100 is provided with a light-scattering layer 500 and a reflective layer 600 in sequence on the side facing the LED lamp. The reflective layer 600 is located on the side of the scattering layer close to the LED, and the reflective surface of the reflective layer 600 faces the light-emitting surface of the lens. 103.

The reflective layer and the lens can be integrally formed so that the light-incident bottom surface of the lens has a reflective function, or it can be provided separately. When installed separately, it can be attached to the upper surface and/or lower surface of the light-incident bottom surface of the lens. Preferably, the reflective layer is attached (the setting method is not limited to one of attachment, and can also be pasted, etc.) on the lower surface of the light-incident bottom surface of the lens, that is, the side of the light-incident bottom surface close to the LED lamp is sequentially provided with light-scattering layer and reflective layer.

It should be noted that the utility model is to reflect and/or diffuse all the light on the light-incident bottom surface of the lens to the light-exit surface. It is not limited, as long as both scattering and reflection can be realized, there is no limitation here, of course, without setting a light scattering layer, directly setting a reflective layer with high reflectivity can also achieve the purpose of the invention of the utility model.

The reflective layer 600 in this embodiment may be composed of various materials capable of reflecting light to improve light extraction efficiency. Preferably, the material is Ag or its alloy, so as to have better light reflection effect.

The reflective layer 600 can be realized by chemical or physical vapor deposition, the realization process of which is in the prior art, and will not be repeated here.

Preferably, the reflective layer has a thickness between 0-0.1 microns, so that the reflective layer is relatively thin and saves material.

In this embodiment, a light scattering layer and a reflective layer are provided on the light incident bottom surface of the lens at the same time, the reflective layer is located on the side of the scattering layer close to the LED lamp, and the reflective surface of the reflective layer faces the light emitting surface. When part of the light continues to emit toward the light-incoming bottom surface of the lens without being scattered, the reflective layer reflects this part of light toward the light-emitting surface of the lens, thereby further improving the effective utilization of light and reducing light loss.

Fig. 6 is the light path diagram of this embodiment, it can be seen from the figure that the light emitted by the LED lamp is scattered by the scattering layer when it hits the light incident bottom surface of the lens, and part of the light incident on the light incident bottom surface of the lens does not scatter, thus When it is incident on the reflective layer, the light will be reflected by the reflective layer towards the light-emitting surface of the lens, and finally all the light incident on the light-entering bottom surface of the lens will be emitted towards the light-emitting surface of the lens, reducing the problem of light leakage and improving the utilization efficiency of the light source .

The lens of the present utility model can be various suitable materials, and its material can be PC (Polycarbonate, polycarbonate), PS (polystyrene), PMMA (polymethylmethacrylate, polymethyl methacrylate). The lens 100 of this embodiment is provided with a groove 101 on the light-incident bottom surface 102 close to the LED lamp, at least a part of the LED lamp is located in the groove, the surface of the groove 101 is arc-shaped or other shapes, and the groove The opening of 101 faces the LED lamp, so that the light emitted by the LED lamp can be directed to the light-emitting surface of the lens through the groove, which reduces the light reflected by the light-incoming bottom surface 102 and improves the efficiency.

The LED lamp 200 is connected with a printed circuit board 300 (PCB, Printed Circuit Board) for driving the LED lamp. The printed circuit board 300 is connected to the lens 100 through the pillar 400 for supporting the lens 100, so as to achieve the purpose of flattening the lens surface.

The material of the PCB of the present invention can be FR4, metal (such as Al), etc. Preferably, the PCB is provided with a tape for heat dissipation or a larger pad. There can also be a Connector (connector) on the PCB, which is used to connect with the LED lamp, and the connection between the two can also be realized through an external lead.

Applying the above technical solution, a light scattering layer is provided on the light incident bottom surface of the lens, which can scatter the light reflected by the lens to the light incident bottom surface of the lens, so as to achieve the light diffusion effect, reduce the light leakage phenomenon of the lens, and improve the performance of the LED backlight. The brightness of the source. The utility model is also provided with a reflective layer on the light incident bottom surface, the reflective surface of the reflective layer is facing the light emitting surface, and the side of the light scattering layer close to the LED lamp is provided with a reflective layer facing the light emitting surface of the lens, and the reflective layer is directed to the lens. The light that enters the bottom surface without being scattered is reflected by the reflective layer toward the light-emitting surface of the lens, which further improves the utilization efficiency of the light source.

Preferably, the present invention also provides a display device, which includes the above-mentioned LED backlight. The display device may be any product or component with a display function such as a liquid crystal panel, an electronic paper, an OLED panel, a liquid crystal TV, a liquid crystal display, a digital photo frame, a mobile phone, and a tablet computer.

The foregoing is a preferred embodiment of the present utility model, and it should be pointed out that for those of ordinary skill in the art, some improvements and modifications can be made without departing from the principle of the present utility model. Retouching should also be regarded as the scope of protection of the present utility model.

Claims (10)

1. a LED-backlit source comprises LED lamp and the lens that are arranged on the LED lamp light emission direction, and described lens comprise exiting surface and light inlet bottom surface, it is characterized in that, described light inlet is provided with light scattering layer on the bottom surface.

2. LED-backlit according to claim 1 source is characterized in that described light scattering layer and lens are one-body molded.

3. LED-backlit according to claim 1 source is characterized in that described light scattering layer is the diffusion particle rete.

4. LED-backlit according to claim 2 source is characterized in that, described light scattering layer is arranged on described light inlet bottom surface near a side of LED lamp.

5. LED-backlit according to claim 1 source is characterized in that described light inlet also is provided with the reflecting layer on the bottom surface, and the reflecting surface in described reflecting layer is towards exiting surface.

6. LED-backlit according to claim 5 source is characterized in that described reflecting layer and lens are one-body molded.

7. LED-backlit according to claim 5 source is characterized in that, described light inlet bottom surface is disposed with light scattering layer and reflecting layer near a side of LED lamp.

8. any one described LED-backlit source is characterized in that according to claim 1-7, and the light inlet bottom surface of described lens is provided with groove, and at least a portion of described LED lamp is positioned at described groove.

9. any one described LED-backlit source is characterized in that according to claim 1-7, and described LED-backlit source also comprises the printed circuit board (PCB) for the driving LED lamp, is provided be used to the pillar that supports described lens on the described printed circuit board (PCB).

10. a display unit is characterized in that, comprises any one described LED-backlit source among the claim 1-9.

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