CN203404718U - Lens and backlight module - Google Patents

Abstract

The utility model provides a lens. The lens has a functional part and a support part arranged at two opposite ends of the functional part and used to support the functional part. The functional part of the lens is coated with a A reflective layer for incident angle light, the reflective layer is formed on the inner surface or outer surface of the functional part. The utility model also provides a backlight module comprising the lens. The lens of the present utility model is coated with a reflective layer on it, and the reflective layer can reflect light with a predetermined incident angle, so that the reflected light can be transmitted out of the lens at a predetermined position on the lens or through the reflective layer and the reflective sheet. Multiple reflections will finally transmit the lens at the predetermined position on the lens, adjust the light intensity distribution emitted by the light source, and finally improve the light uniformity of the light source, without increasing the number of light sources in the LCD backlight module and ensuring the backlight module In the case of thin design, the backlight uniformity is improved.

Description

Lens and backlight module

technical field

The utility model relates to the field of liquid crystal display, in particular to a lens for a liquid crystal display device and a backlight module with the lens.

Background technique

Existing liquid crystal display devices are usually provided with a backlight module for supplying sufficient brightness and evenly distributed light so that the liquid crystal display device can display images normally. In the direct-type backlight module, most of the light-emitting lenses of LEDs (light-emitting diodes) belong to the primary optical design, and the radiation angle of the primary lens is generally a predetermined angle, which causes the light emitted by the LED to be concentrated and distributed in a predetermined area. It is difficult to obtain high uniformity.

At present, on the one hand, in order to improve the uniformity of light, in the traditional backlight module, the thickness of the backlight module is usually increased to achieve light mixing to ensure that the LED beam spreads evenly, making it difficult for LCD screens that currently use direct-type backlight modules. Achieve ultra-thin. On the other hand, in order to achieve ultra-thin backlight modules and improve the uniformity of LED light sources, most of the industry currently uses ordinary light-emitting angle LEDs to reduce the light mixing distance of LEDs and achieve thinner direct-type backlight modules. However, this also leads to an increase in LED density, which greatly increases the power consumption of the LED backlight module, and adversely affects the heat dissipation and driving of the LED backlight module.

Utility model content

The main purpose of the utility model is to provide a lens, aiming to adjust the light angle of the light source to improve the uniformity of the backlight without increasing the number of light sources of the backlight module and realizing the thin design of the backlight module.

In order to achieve the above object, the utility model provides a lens, the lens has a functional part and a support part arranged at two opposite ends of the functional part and used to support the functional part, the functional part of the lens is coated with There is a reflective layer for reflecting light having a predetermined incident angle, the reflective layer being formed on the inner surface or the outer surface of the functional part.

Preferably, the functional part includes a first part and a second part, and the first part and the second part are respectively arranged on a plane and form an included angle therebetween.

Preferably, the functional part is arranged in an arc and bends toward the light source.

Preferably, the functional parts are arranged on a plane.

The utility model further provides a backlight module for a liquid crystal display device, comprising a light source, a reflection sheet arranged on one side of the light source, and a lens arranged on the other side of the light source relative to the reflection sheet, the lens It has a functional part and a supporting part arranged at two opposite ends of the functional part and is used to support the functional part. The functional part of the lens is coated with a reflective layer for reflecting light with a predetermined incident angle. The reflective layer formed on the inner surface or the outer surface of the functional part.

Preferably, the functional part includes a first part and a second part, and the first part and the second part are respectively arranged on a plane and form an included angle therebetween.

Preferably, the functional part is arranged in an arc and bends toward the light source.

Preferably, the functional parts are arranged on a plane.

The lens of the present utility model is coated with a reflective layer on it, and the reflective layer can reflect light with a predetermined incident angle, so that the reflected light can be transmitted out of the lens at a predetermined position on the lens or through the reflective layer and the reflective sheet. Multiple reflections will finally transmit the lens at the predetermined position on the lens, adjust the light intensity distribution of the light source, and finally improve the uniformity of the backlight, which can ensure the thinner design of the backlight module without increasing the number of light sources in the LCD backlight module In the case of improving the backlight uniformity of the liquid crystal display device.

Description of drawings

FIG. 1 is a partial structural schematic diagram of a backlight module according to a first embodiment of the present invention;

FIG. 2 is a partial structural diagram of the backlight module according to the second embodiment of the present invention; and,

FIG. 3 is a partial structural diagram of a backlight module according to a third embodiment of the present invention.

The realization of the purpose of the utility model, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Please refer to FIG. 1 , which is a partial structural diagram of a backlight module 100 according to a first embodiment of the present invention. The backlight module 100 can be applied to a liquid crystal display device to supply sufficient brightness and evenly distributed light so that the liquid crystal display device can display images normally. The backlight module 100 includes a light source 10 , a reflection sheet 20 located on one side of the light source 10 , and a lens 30 located on the other side of the light source 10 opposite to the reflection sheet 20 . The reflective sheet 20 is used to reflect the light emitted by the light source 10 , so that all the light emitted by the light source 10 towards the reflective sheet 20 is reflected to change its propagation direction. The lens 30 is used to reflect light with a predetermined incident angle emitted by the light source 10 according to product design requirements, so as to adjust the light intensity distribution of the light source 10 and improve the backlight uniformity of the backlight module 100 . In this embodiment, the light source 10 is an LED light source.

In the present invention, the corresponding position of the lens 30 is coated with a reflective layer (not shown). In this embodiment, the reflective layer is formed by coating with a material that can reflect light, can have a predetermined pattern according to needs, and can reflect light with a predetermined incident angle according to its own pattern, thereby reducing the light emitted by the light source 10. The light with a predetermined angle directly transmits the possibility of the lens 30, thereby reducing the light intensity on the predetermined area in the backlight module 100; The area (hereinafter referred to as the blank area) directly transmits out of the lens 30 , or passes through the lens through the blank area after multiple reflections on the reflective layer and the reflective sheet 20 , thereby increasing the light intensity of the corresponding area in the backlight module 100 . Therefore, by disposing the lens 30 and coating the reflective layer on the corresponding position of the lens 30, the light intensity distribution of the light source 10 can be adjusted, and the backlight uniformity can be improved.

It should be noted that the arrangement pattern of the reflection layer is not limited to a certain form, and can be adjusted accordingly according to the needs of the backlight. It is distributed in a linear form, that is, it is composed of several linear reflective areas; or it can be distributed in a planar form, that is, it is set in the form of a complete reflective layer. At the same time, the setting position of the reflective layer can also be adjusted accordingly according to needs. For example, to reduce the light intensity of the area directly above the light source 10 in the backlight module 100, the reflective layer can be coated on the middle position of the lens 30, Thus, the light with a predetermined incident angle incident on the middle position of the lens 30 can be reflected to the blank area on the lens 30 and directly exit the lens 30 or be reflected to the reflective sheet 20, and then be reflected by the reflective sheet 20 or pass through the reflective sheet 20 and the reflective layer reflect several times and exit the lens 30 through the blank area of the lens 30; and for example, if in order to reduce the light intensity of the areas corresponding to the two ends of the lens 30 in the backlight module 100, the reflective layer can be coated on the lens 30, so that the light with a predetermined angle of incidence incident on both ends of the lens 30 can be reflected to the blank area on the lens 30 and directly exit the lens 30 or be reflected to the reflective sheet 20, and then pass through the reflective sheet 20 The reflection or several reflections of the reflection sheet 20 and the reflection layer exit the lens 30 through the blank area of the lens 30 .

In some embodiments, the above-mentioned reflective layer can be coated on any position on the lens 30 . In some other embodiments, the above-mentioned reflective layer may be coated on a predetermined position on the lens 30 . In these embodiments, the lens 30 may include a functional part 31 on which the reflective layer is coated and a support part 32 for supporting the functional part 31 . The reflective layer is formed on an inner surface or an outer surface of the functional part. Of course, the supporting portion 32 is a part of the lens 30 and can also transmit light when there is light projected thereon. In different embodiments, the size and shape of the functional parts can be set according to actual needs. Different configurations of the functional parts will result in different reflection angles of the reflection layer for light rays with the same incident angle, so that the position and angle of the light rays with the same incident angle finally transmitted out of the lens 30 will also change accordingly. Therefore, in the case of the same pattern and position of the reflective layer, the difference in the arrangement of the functional parts will directly affect the ability of the lens 30 to improve the uniformity of the backlight. The influence of different functional parts on the position of light transmitted through the lens 30 will be described in detail below through different embodiments.

Referring again to FIG. 1, in the embodiment shown in FIG. 1, the lens 30 has a functional portion 31 and a support portion 32, wherein the functional portion 31 is arranged on a curved surface, including a first part and a second part, and the first part and the second part The parts are arranged approximately on a plane with an included angle formed therebetween. The supporting part 32 is formed between the end part of the functional part 31 and the reflection sheet 20 for supporting the functional part 31 . The light L emitted by the light source 10 first projects on the reflective layer coated on the functional part 31, and is projected on the support part 32 after being reflected by the reflective layer, and then transmits out of the lens 30 through point a, where the light is transmitted and reflected There is a certain angle between the pieces 20 .

Referring to FIG. 2 , in the second embodiment, the lens 30 ′ is similar to the lens 30 shown in FIG. 1 , except that its functional portion 31 ′ is substantially arranged on a plane. The light L emitted by the light source 10 is projected on the reflective layer of the functional part 31 ′, then is reflected by the reflective layer 31 ′ and projected on the reflective sheet 20 , and is reflected on the reflective sheet 20 again to project on the support part 32 'On and transmitted out of the lens 30' via b. Compared with the embodiment shown in FIG. 1 , the position b is further away from the reflective sheet 20 , and the angle between the transmitted light and the reflective sheet 20 is larger.

Referring to FIG. 3, in the third embodiment, the lens 30'' is similar to the lens 30 shown in FIG. 1 and the lens 30'' shown in FIG. And bend toward the light source 10 . After the light L emitted by the light source 10 is projected on the reflective layer of the functional part 31 ″, it is reflected by the reflective layer 31 ″ and projected on the reflective sheet 20 , and is reflected on the reflective sheet 20 again to project on the support portion 32'' and transmits out of lens 30'' at c. Compared with the embodiments shown in FIG. 1 and FIG. 2 , the position c is further away from the reflective sheet 20 , and the angle between the position of the lens 30 and the reflective sheet 20 is larger.

It can be seen from the above three embodiments that due to the difference in the configuration of the functional parts, the position and angle of the light emitted by the light source 10 at the same angle and transmitted through the lens 30 also change accordingly. Therefore, on the basis of keeping the pattern and position of the reflective layer unchanged, the ability to adjust the light intensity distribution of the lens 30 can also be changed by changing the arrangement of the functional parts, thereby realizing the use of the lens 30 to improve the uniformity of the backlight. Certainly, the lens 30 is not limited to the above three embodiments, and in practical applications, the settings of the functional parts can be adjusted according to actual needs.

In the backlight module 100 of the present utility model, by setting the lens 30 and coating the reflective layer at the corresponding position of the lens 30, the lens 30 can reflect light with a predetermined incident angle according to the design, so that the reflected light can be on the predetermined angle of the lens. The position is transmitted out of the lens or through the multiple reflections of the reflective layer and the reflective sheet, and finally transmitted out of the lens at the predetermined position on the lens to adjust the light intensity distribution of the LED light source and finally improve the light uniformity of the LED light source without increasing The number of LED light sources in the backlight module of the LCD screen and the thin design of the backlight module are guaranteed to improve the uniformity of the backlight.

The above descriptions are only preferred embodiments of the present utility model, and are not therefore limiting the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the specification of the utility model and the contents of the accompanying drawings may be directly or indirectly used in Other relevant technical fields are all included in the patent protection scope of the present utility model in the same way.

Claims (8)

1. A lens, characterized in that, the lens has a functional portion and is arranged on two opposite ends of the functional portion and is used to support a supporting portion for supporting the functional portion, and the functional portion of the lens is coated with A reflective layer having light rays at a predetermined incident angle, the reflective layer being formed on the inner surface or the outer surface of the functional part. the 2 . The lens according to claim 1 , wherein the functional part comprises a first part and a second part, and the first part and the second part are respectively arranged on a plane and form an included angle therebetween. the 3. The lens according to claim 1, wherein the functional part is arranged in an arc and bends toward the light source. the 4. The lens according to claim 1, wherein the functional part is arranged in a plane. the 5. A backlight module for a liquid crystal display device, comprising a light source and a reflective sheet arranged on one side of the light source, characterized in that it also includes a lens arranged on the other side of the light source relative to the reflective sheet, so The lens has a functional part and a support part arranged at two opposite ends of the functional part and used to support the functional part. The functional part of the lens is coated with a reflective layer for reflecting light with a predetermined incident angle. A reflective layer is formed on an inner surface or an outer surface of the functional part. the 6. The backlight module according to claim 5, wherein the functional part comprises a first part and a second part, and the first part and the second part are respectively arranged on a plane and form an angle between them . the 7. The backlight module according to claim 5, wherein the functional part is arranged in an arc and bends toward the light source. the 8. The backlight module according to claim 5, wherein the functional part is arranged on a plane. the

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