WO2019119710A1

WO2019119710A1 - Lens structure for led television backlight source

Info

Publication number: WO2019119710A1
Application number: PCT/CN2018/085666
Authority: WO
Inventors: 寇开泰
Original assignee: 深圳市利科达光电有限公司
Priority date: 2017-12-19
Filing date: 2018-05-04
Publication date: 2019-06-27

Abstract

Disclosed is a lens structure for an LED television backlight source, comprising a lens body covering an LED chip. The surface of the lens body is provided with a recess and multiple annular slots; the recess is located in the center of the lens body; the multiple annular slots all surround the recess; and the diameters of the multiple annular slots are gradually increased in sequence from inside to outside. According to the present invention, the scattering effect of a lens is greatly improved under the action of Fresnel optical patterns formed by the recess and the multiple annular slots, and it is not necessary for the lens to be made thick under the combined action of the Fresnel optical patterns and the lens body, so that the lens can be better applied to an ultrathin LED television. Furthermore, in addition to the provision of the recess and the annular slots on the surface of the lens, no other complex structure needs to be additionally provided on the lens, so that the lens structure is simpler, easy to implement, and low in costs.

Description

Lens structure for LED television backlight

Technical field

The present invention relates to optical lenses, and more particularly to a lens structure for an LED television backlight.

Background technique

With the improvement of living standards, people's expectations for consumer electronics products are getting higher and higher. As the main entertainment equipment of the family, the advantages of LED-backlit TV are uniform illumination, brighter colors and higher definition. The relevant departments are the main sellers in the market. LED-backlit TV has been investigated. The global consumption of LED TV will be close to 80 million units per year. In the next five to six years, the color TV market will be transformed from the current LCD to LED and OLED TV, especially LED-backlit TV. It is not just a new product for the TV industry, but also a signal for industrial upgrading. At present, LED backlight TVs exist in the market in three categories: 1. LED backlighting by the starry sky light source. The disadvantages are: the light source is large, the color of the light source needs four colors of red, yellow, blue and white, and the product cost is high, and it is gradually eliminated; The large-angle back lens used in LED backlight TV has the disadvantage that the distance from the light source to the LED LCD TV screen needs to be >25mm--35mm, which cannot be ultra-thin and has poor aesthetics. 3. The main advantage of OLED is illumination. Uniform, good color, beautiful and ultra-thin, the screen thickness is generally 16mm, the shortcoming is: OLED TV price is too high, resulting in OLED TV is difficult to popularize.

Summary of the invention

The technical problem to be solved by the present invention is to provide a lens structure for an LED television backlight that is simple in structure, low in cost, uniform in light scattering, and contributes to ultra-thinness of an LED television in view of the deficiencies of the prior art.

In order to solve the above technical problems, the present invention adopts the following technical solutions.

A lens structure for an LED television backlight, comprising a lens body covering the LED chip, the surface of the lens body being provided with a recessed portion and a plurality of annular annular slots, the recessed portion being located at a center of the lens body The plurality of annular annular slots are all surrounded by the recesses, and the diameters of the plurality of annular annular slots are sequentially increased from the inside to the outside.

Preferably, the upper and lower surfaces of the lens body are provided with a recessed portion and a plurality of annular annular slots.

Preferably, the opening of the recess is circular, and the annular slot is disposed at the same center as the opening of the recess.

Preferably, the inner wall of the recess is tapered.

Preferably, the upper and lower surfaces of the lens body are each square.

Preferably, the two opposite outer sidewalls of the lens body are respectively provided with a notch which is located at the middle of the outer side wall of the lens body.

Preferably, the recess is an arcuate recess.

Preferably, the surface of the lens body is printed with an optical coating, which is a light reflecting layer or a light diffusing layer.

Preferably, the optical coating comprises a plurality of circular coatings, the circular coating being located within the recess.

Preferably, the optical coating comprises a plurality of annular coatings, the annular coating being disposed centrally with the annular slot.

The lens structure for LED TV backlight disclosed in the present invention covers the light emitting side of the LED chip. Since the center of the lens body is provided with a recessed portion, the outer side of the recessed portion is provided with a plurality of annular annular slots, and the depressed portion Fresnel optical lines are formed by the annular grooves of the plurality of turns, and the light emitted by the LED chips is uniformly scattered outward through the Fresnel optical lines. Under the action of these Fresnel optical lines, the scattering effect of the lens is greatly improved. At the same time, under the combination of the Fresnel optical texture and the lens body, the lens does not need to be made into a thicker size, so it can be better applied to the ultra-thin LED TV. In addition, the above lens does not need to add other complicated structures, only It is necessary to provide a recessed portion and an annular slot on the surface of the lens, so that the structure is simpler, not only easy to implement, but also low in cost.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view showing a lens structure in a first embodiment of the present invention.

Figure 2 is a cross-sectional view showing the structure of a lens in the first embodiment of the present invention.

Fig. 3 is a view showing the surface structure of a lens structure in the first embodiment of the present invention.

Figure 4 is a view showing the surface structure of a lens structure in a second embodiment of the present invention.

Figure 5 is a view showing the surface structure of a lens structure in a third embodiment of the present invention.

Fig. 6 is a schematic view showing a splicing manner of a plurality of lens structures.

Fig. 7 is a schematic view showing another splicing manner of a plurality of lens structures.

Detailed ways

The invention will now be described in greater detail with reference to the drawings and embodiments.

Example 1

The embodiment of the present invention provides a lens structure for an LED television backlight. As shown in FIG. 1 to FIG. 3, the lens body includes a lens body 1 covering the LED chip. The surface of the lens body 1 is provided with a recess 2 and The plurality of annular slots 3 are located at the center of the lens body 1, and the plurality of annular annular slots 3 are all surrounded by the recesses 2, and the diameters of the plurality of annular annular slots 3 are sequentially increased from the inside to the outside.

The above lens structure covers the light emitting side of the LED chip. Since the concave portion 2 is disposed at the center of the lens body 1, the outer side of the concave portion 2 is provided with a plurality of annular annular grooves 3, the concave portion 2 and a plurality of annular rings. The slot 3 forms Fresnel optical lines, and the light emitted by the LED chips is uniformly scattered outward through the Fresnel optical lines. Under the action of these Fresnel optical lines, the scattering effect of the lens is greatly improved, and at the same time in Fresnel The combination of the optical path and the lens body makes the lens unnecessary to be made into a thicker size, so it can be suitably applied to an ultra-thin LED TV. In addition, the lens does not need to add other complicated structures, and only needs to be on the surface of the lens. The recess 2 and the annular slot 3 are provided, so that the structure is simpler, not only easy to implement, but also low in cost.

In this embodiment, in order to improve the light scattering effect of the lens structure, the upper and lower surfaces of the lens body 1 are provided with a recessed portion 2 and a plurality of annular annular slots 3. In addition, this embodiment also makes the front and back surfaces of the lens have the same structure, and is not limited by the mounting direction.

In this embodiment, the lens body 1 has a thickness of 3 mm.

In this embodiment, the opening of the recessed portion 2 is circular, and the annular slot 3 and the opening of the recessed portion 2 are disposed at the same center. Further, in order to fully exert the refractive and scattering effects of the depressed portion 2, the inner wall of the depressed portion 2 is tapered.

In order to facilitate the assembly with a plurality of lenses, the upper and lower surfaces of the lens body 1 are each square. Further, the two opposite outer sidewalls of the lens body 1 are respectively provided with a notch 4 located at the middle of the outer side wall of the lens body 1. The recess 4 described above facilitates the pick-and-place lens during production and assembly, wherein the recess 4 is an arcuate recess.

Example 2

Referring to FIG. 4, the difference between this embodiment and Embodiment 1 is that the surface of the lens body 1 is printed with an optical coating, and the optical coating is a light reflecting layer or a light diffusing layer. Further, the optical coating comprises a plurality of circular coatings 5, the circular coatings 5 being located within the recesses 2.

Example 3

Referring to Figure 5, the present embodiment differs from Embodiment 2 in that the optical coating comprises a plurality of annular coatings 6, which are disposed centrally with the annular slot 3.

The lens structure for LED television backlight disclosed by the invention ensures the uniformity of light and the diffusion effect of the lens under the joint action of Fresnel optical lines and optical coating, so that the lens structure not only improves optical performance And can be applied to the ultra-thin TV in a thinner size. As shown in FIG. 6 and FIG. 7, the lens structure of the present invention can be horizontally and longitudinally spliced, and is easy to lay along the plane in the backlight module of the LED TV, thereby being more Flexibility, suitable for popularization and application in ultra-thin LED TVs, and has a good application prospect.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. All modifications, equivalents, and improvements made within the technical scope of the present invention are intended to be included within the scope of the present invention.

Claims

A lens structure for an LED television backlight, comprising: a lens body (1) covering the LED chip, the surface of the lens body (1) is provided with a recessed portion (2) and a plurality of annular rings a groove (3), the recessed portion (2) is located at the center of the lens body (1), and the plurality of annular annular slots (3) are both surrounded by the recessed portion (2), and the diameter of the plurality of annular annular slots (3) It is incremented from the inside to the outside.
The lens structure for an LED television backlight according to claim 1, wherein the upper and lower surfaces of the lens body (1) are each provided with a recessed portion (2) and a plurality of annular annular slots (3).
The lens structure for an LED television backlight according to claim 1, wherein the opening of the recess (2) is circular, the annular slot (3) and the recess (2) The opening is set with the center of the circle.
A lens structure for an LED television backlight according to claim 1, wherein the inner wall of the recess (2) is tapered.
The lens structure for an LED television backlight according to claim 1, wherein the upper and lower surfaces of the lens body (1) are each square.
The lens structure for an LED television backlight according to claim 5, wherein two opposite outer sidewalls of the lens body (1) are respectively provided with a notch (4), the notch (4) ) located at the middle of the outer side wall of the lens body (1).
A lens structure for an LED television backlight according to claim 6, wherein said recess (4) is an arcuate recess.
The lens structure for an LED television backlight according to claim 1, wherein the surface of the lens body (1) is printed with an optical coating, and the optical coating is a light reflecting layer or a light diffusing layer.
A lens structure for an LED television backlight according to claim 8, wherein said optical coating comprises a plurality of circular coatings (5), said circular coating (5) being located Inside the recess (2).
A lens structure for an LED television backlight according to claim 8, wherein said optical coating comprises a plurality of annular coatings (6), said annular coating (6) and said annular narrow The groove (3) is set with the center of the circle.