CN112987411A

CN112987411A - Side-in backlight module and electronic equipment

Info

Publication number: CN112987411A
Application number: CN201911281352.8A
Authority: CN
Inventors: 张小齐; 彭益; 程述武; 曾晓虎
Original assignee: Shenzhen Longli Technology Co Ltd
Current assignee: Shenzhen Longli Technology Co Ltd
Priority date: 2019-12-13
Filing date: 2019-12-13
Publication date: 2021-06-18

Abstract

The invention discloses a side-in type backlight module and electronic equipment thereof. The side-in type backlight module comprises an LED light source and an optical film set. The optical film group comprises a light guide plate arranged on one side of the LED light source, a prism sheet arranged above the light guide plate and a reflecting sheet arranged below the light guide plate; the optical film group is provided with an optical diffusion unit, and the density of the optical diffusion unit at the near LED light source end is higher than that of the optical diffusion unit at the far LED light source end. The invention provides a display device which is ultrathin and has high dynamic contrast.

Description

Side-in backlight module and electronic equipment

Technical Field

The invention relates to the technical field of communication, in particular to a side-in type backlight module and electronic equipment.

Background

The edge-type backlight module is widely and commercially applied to liquid crystal displays. In recent years, in order to improve the contrast of a liquid crystal display panel and to improve the problem of dynamic liquid crystal smear, a High-dynamic contrast (HDR) technology has emerged. The HDR technology can increase the luminance range, improve the contrast of the brightest and darkest pictures, not only obtain a wider color range, but also bring a darker or whiter color effect, so that a user can see more picture details, and the display effect is greatly improved. The HDR technique is to divide a backlight into a plurality of regions in a certain direction, each region is called a Block (Block), each region is rectangular, and a liquid crystal display is also divided into a plurality of regions corresponding to the backlight. Each section of the backlight coincides with a projection of a section of the liquid crystal display vertically above the backlight. Light from each section of the backlight is emitted to the liquid crystal display to provide light for image display, and the brightness of each section of the backlight is independently adjusted to achieve the desired contrast of the displayed image. Generally, the higher the contrast value of HDR, the better the display effect. To obtain higher HDR contrast values, the more partitions of the backlight the better.

As shown in fig. 1, the conventional edge-lit backlight mainly includes a reflective sheet 1, a light guide plate 2, a diffusion sheet 3, two orthogonal prism sheets (i.e., an upper prism layer 4 and a lower prism layer 5), and an LED light source 6. After light emitted by the LED lamp strips enters the light guide plate from one side end face of the light guide plate, the light is totally reflected back and forth between the upper surface and the lower surface of the light guide plate and two side faces of the light guide plate and advances towards the other side end face of the light guide plate, when the light strikes scattering dots on the lower bottom face, the reflected light is scattered towards all directions and the total reflection condition is destroyed, so that part of the scattered light has a chance to transmit out of the light guide plate from the upper. The reflector plate is used for reflecting light rays emitted from the back side to the front side to increase light intensity; the diffusion sheet diffuses the output light to ensure the uniformity of the emitted light; the two prism sheets which are orthogonal up and down collect diffused light, improve the intensity of the emitted light and ensure the brightness requirement of the liquid crystal display.

With the ultra-thin development of liquid crystal display electronic products and the realization of higher HDR contrast value, higher requirements are also put forward on the thickness of the backlight module of the liquid crystal display. In each optical film of the backlight module, the diffusion sheet is a main film which determines the thickness of the backlight module, and on one hand, the phenomena of film arching and wrinkling can occur when the thickness of the diffusion sheet is too thin, so that the display effect is influenced; on the other hand, if the diffusion film is not provided, the LED is a point light source, and problems such as halation, glare, and eye may occur at the base of the lamp, and thus uniform display cannot be performed.

Disclosure of Invention

The invention mainly solves the technical problem of providing a lateral backlight module and an electronic device thereof, and aims to solve the problem of how to provide an ultrathin display device with high dynamic contrast in the prior art.

In order to solve the above technical problems, one technical solution of the present invention is to provide a side-in type backlight module including an LED light source and an optical film set. The optical film group comprises a light guide plate arranged on one side of the LED light source, a prism sheet arranged above the light guide plate and a reflecting sheet arranged below the light guide plate; the optical film group is provided with an optical diffusion unit, and the density of the optical diffusion unit at the end close to the LED light source is higher than that of the optical diffusion unit at the end far away from the LED light source.

According to the backlight module, a diffusion sheet is not required to be arranged, the optical diffusion unit replaces the backlight module to achieve the light emitting uniformity of the backlight module, so that the ultra-thin backlight module and the display equipment are achieved, and meanwhile, the display picture with the high HDR contrast value of the terminal equipment is obtained. The density of the optical diffusion unit at the end close to the LED light source is higher than that at the end far away from the LED light source, so that the brightness and the uniformity of the visible light source of the backlight module are kept. In addition, the production, assembly process and structure of the whole backlight module are simpler, and the structural stability is high.

In a preferred embodiment, the optical diffusion unit is disposed on a light emitting surface of the light guide plate.

In another preferred embodiment, the optical diffusion unit is disposed on the prism sheet, and specifically, is disposed on the light incident surface or the light emergent surface of the prism sheet.

In still another preferred embodiment, the optical diffusion unit is disposed on a reflection surface of the reflection sheet.

The optical diffusion unit comprises visible light diffusion particles, and the visible light diffusion particles comprise at least one particle of SiO2, TiO2, Au, Ag, Al, Cu, Zn, Pt, Co, Ni, Cu2O, CuO, CdO, ZnO and glass fiber.

In a preferred embodiment, the optical diffuser unit is formed by injection molding dots.

In a preferred embodiment, the optical diffusion unit is formed by coating.

The LED light source comprises at least one of a mini LED, a Micro LED, an OLED or a conventional LED chip.

According to the embodiment of the invention, the lateral type backlight module, the LCD panel and the glass cover plate are integrated into an electronic device which can be applied to an LCD display.

Drawings

The invention and its advantages will be better understood by studying the following detailed description of specific embodiments, given by way of non-limiting example, and illustrated in the accompanying drawings, in which:

FIG. 1 is a schematic diagram of a side-in type backlight module of a prior art LCD display.

Fig. 2 is an exploded view of a side-in backlight module according to embodiment 1 of the present invention.

Fig. 3 is an exploded view of a side-in backlight module according to embodiment 2 of the present invention.

Detailed Description

Referring to the drawings, wherein like reference numbers refer to like elements throughout, the principles of the present invention are illustrated in an appropriate environment. The following description is based on illustrated embodiments of the invention and should not be taken as limiting the invention with regard to other embodiments that are not detailed herein.

The word "embodiment" is used herein to mean serving as an example, instance, or illustration. In addition, the articles "a" and "an" as used in this specification and the appended claims may generally be construed to mean "one or more" unless specified otherwise or clear from context to be directed to a singular form.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Further, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise direct contact of the first and second features through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

Example 1

First, a side-in type backlight module according to embodiment 1 of the present invention will be described with reference to fig. 2. A side-in backlight module comprises an LED light source 10 and an optical film group 11. The optical film set 11 includes a light guide plate 13 disposed on one side of the LED light source, a prism sheet 14 disposed above the light guide plate 13, and a reflective sheet 12 disposed below the light guide plate 13; wherein, an optical diffusion unit 20 is disposed on the optical film group 11, and the density of the optical diffusion unit 20 at the end near the LED light source 10 is higher than that at the end far from the LED light source 10. The optical diffusion unit 20 is disposed on the light emitting surface of the reflective sheet 12.

In the side-in backlight module of this embodiment, a diffusion sheet is not required to be arranged, and the optical diffusion unit 20 replaces the backlight module to achieve the light-emitting uniformity of the backlight module, thereby achieving the ultra-thin backlight module and the display device, and obtaining the display picture with the high HDR contrast value of the terminal device. The density of the optical diffusion unit 20 near the LED light source 10 is higher than that of the optical diffusion unit 20 far from the light source end of the LED light source 10, so as to maintain the brightness and uniformity of the visible light source of the backlight module. In addition, the production, assembly process and structure of the whole backlight module are simpler, and the structural stability is high.

The optical diffusion unit 20 includes visible light diffusing particles including SiO2 particles and glass fiber particles.

In a preferred embodiment, the optical diffusion unit 20 is formed by coating.

The LED light source 10 comprises a mini LED.

Example 2

Fig. 3 is an exploded view of a side-entry backlight module according to embodiment 2 of the present invention. Only the differences between embodiment 2 and embodiment 1 will be described below, and the descriptions of the similarities will be omitted.

The optical diffusion unit 20 is further disposed on a light emitting surface of the light guide plate 13.

Example 3

Only the differences between embodiment 3 and embodiment 2 will be described below, and the descriptions of the similarities are omitted here.

The optical diffusion unit 20 is further disposed on the light incident surface of the prism sheet 14. The prism sheet optical diffusion unit 20 can prevent the prism sheet from being adsorbed to the light guide plate, and reduce the generation of newton's rings of visible light and infrared light.

Here, the optical diffusion unit 20 may be alternatively or additionally disposed on the light emitting surface of the prism sheet 14 or the light incident surface of the light guide plate 13.

While the invention has been described above with reference to certain embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the various embodiments of the present disclosure may be used in any combination, provided that there is no structural conflict, and the combination is not exhaustively described in this specification for brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. an edge-type backlight module, is characterized in that, comprises:

LED light source;

an optical film set, comprising a light guide plate arranged on one side of the LED light source, a prism sheet arranged above the light guide plate, and a reflection sheet arranged below the light guide plate;

Wherein, the optical film set is provided with an optical diffusion unit, and the density of the optical diffusion unit at the end near the LED light source is higher than that at the end far from the LED light source.

2 . The edge-type backlight module according to claim 1 , wherein the optical diffusion unit is disposed on the light emitting surface of the light guide plate. 3 .

3 . The edge-type backlight module of claim 1 , wherein the optical diffusion unit is disposed on the prism sheet. 4 .

4 . The edge-type backlight module of claim 1 , wherein the optical diffusion unit is disposed on the reflective surface of the reflective sheet. 5 .

5 . The edge-type backlight module according to claim 1 , wherein the optical diffusion unit comprises visible light diffusion particles, and the visible light diffusion particles include SiO 2 , TiO 2 , Au, Ag, Al, Cu, Zn, At least one particle of Pt, Co, Ni, Cu2O, CuO, CdO, ZnO, and glass fiber.

6 . The edge-type backlight module of claim 1 , wherein the optical diffusion unit is formed by injection molding mesh points. 7 .

7 . The edge-type backlight module of claim 1 , wherein the optical diffusion unit is formed by coating. 8 .

8 . The edge-lit backlight module according to claim 1 , wherein the LED light source comprises at least one of mini LED, Micro LED, OLED or conventional LED chips. 9 .

9. An electronic device, comprising: an LCD panel, a glass cover, and the edge-type backlight module according to any one of claims 1-8.