WO2015014103A2

WO2015014103A2 - Backlight module and liquid crystal display device

Info

Publication number: WO2015014103A2
Application number: PCT/CN2014/000877
Authority: WO
Inventors: 任杰
Original assignee: 苏州艾尔迪电子有限公司
Priority date: 2013-07-29
Filing date: 2014-09-28
Publication date: 2015-02-05
Also published as: CN203365862U; WO2015014103A3

Abstract

The present utility model discloses a backlight module and a liquid crystal display device. The backlight module comprises a light source, a reflector plate, and a diffusion plate. The diffusion plate is provided above the light source in the direction of the light emission of the light source. The reflection plate is provided below the light source in the direction of the light emission of the light source. The material of the substrate of the diffusion plate is non-woven fabric comprising within fibrous diffusion structures. The liquid crystal display device comprises a backlight module and a liquid crystal display. The liquid crystal display is provided above the diffusion plate. At least one brightening plate is provided between the liquid crystal display and the diffusion plate. By utilizing the method, the backlight module and the liquid crystal display of the present utility model have the advantages of uniform light guiding, simple manufacturing, light weight and thinness, and low cost, and are suited for application in fields related to liquid crystal televisions, tablets, and mobile phone screens.

Description

Backlight module and liquid crystal display device

Technical field

The utility model relates to the field of structural design of a liquid crystal display system, in particular to a backlight module and a liquid crystal display device.

Background technique

With the development of the liquid crystal display industry, liquid crystal displays and liquid crystal display modules have been widely used in products such as televisions and mobile phones. However, since the liquid crystal itself does not emit light, in order to allow the user to see the gorgeous and colorful picture displayed on the liquid crystal display, the liquid crystal display generally must be used together with a light source. Due to the characteristics of the liquid crystal, this light source is generally placed on the back of the liquid crystal display, which is called backlight in the industry. The main function of the liquid crystal display backlight is to provide a uniform, stable planar light source with a certain brightness. The core light source of the internal light source is usually a light-emitting diode, and the uneven light source emitted by the LED is converted by the light guide plate and the diffusion sheet. It is a uniform surface light source.

In the patent documents that have been disclosed so far, the diffusion sheets in the backlight are mostly coated with optical grade transparent polyester film (PET) coated glass beads, or after special coating treatment on the optical grade PET surface. . However, whether it is PET coated glass beads or PET surface coating, it is based on PET, the process is complicated, the cost is high, and the overall thickness of the liquid crystal display is not further controlled.

Utility model content

The technical problem mainly solved by the utility model is to provide a backlight module and a liquid crystal display device, which adopts a non-woven fabric diffusion sheet to replace the traditional PET diffusion sheet or the diffusion plate, and has the overall thickness reduction, uniform light guiding, simple process and high cost performance.

In order to solve the above technical problem, a technical solution adopted by the present invention is to provide a backlight module, comprising: a light source, a reflection sheet and a diffusion sheet, wherein the diffusion sheet is disposed above a light exiting direction of the light source, and the reflection The sheet is disposed below the light exit direction of the light source, and the substrate of the diffusion sheet is non-woven The cloth has a fibrous diffusion structure inside.

In a preferred embodiment of the present invention, the backlight module further includes a brightness enhancing sheet, and the diffusion sheet is disposed between the brightness enhancing sheet and the light source.

In a preferred embodiment of the present invention, the light source includes a plurality of point light sources, and the plurality of point light sources have a light emitting direction toward the diffusion sheet.

In a preferred embodiment of the present invention, the light source includes a light guide plate and a light source, and the light guide plate includes a light incident surface at a side thereof, and the light source is disposed adjacent to the light incident surface.

In a preferred embodiment of the present invention, the light source is a light emitting diode or a cold cathode fluorescent lamp.

In a preferred embodiment of the present invention, the light guide plate includes a bottom surface at a bottom thereof, and the reflection sheet is disposed below the bottom surface.

In a preferred embodiment of the present invention, the substrate is a polypropylene fiber and a polyester fiber.

In order to solve the above technical problem, another technical solution adopted by the present invention is to provide a liquid crystal display device, including: a backlight module and a liquid crystal display panel, the backlight module includes a light source, a reflective sheet, and a diffusion sheet, The diffusion sheet is disposed above the light-emitting direction of the light source, the reflection sheet is disposed below the light-emitting direction of the light source, and the substrate of the diffusion sheet is a nonwoven fabric, and the inside thereof includes a fibrous diffusion structure.

In a preferred embodiment of the present invention, the liquid crystal display panel is disposed above the diffusion sheet.

In a preferred embodiment of the present invention, at least one brightness enhancing sheet is disposed between the liquid crystal display panel and the diffusion sheet.

The utility model has the beneficial effects that the backlight module and the liquid crystal display device pointed out by the utility model adopts a non-woven fabric with specific properties to form a diffusion sheet instead of the conventional PET-based diffusion sheet or diffusion plate, and has light guiding. Good uniformity, simple production, light size and low price, suitable for LCD TV, tablet, mobile phone screen and other related fields.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some implementations of the present invention. For example, other drawings can be obtained according to these drawings without any creative work for those skilled in the art, wherein:

1 is a schematic structural view of the present invention applied to a liquid crystal television display device;

2 is a schematic structural view of the screen display device applied to the mobile phone according to the present invention;

The components of the drawings are marked as follows: 1. backlight module, 2, liquid crystal display panel, 3. brightness enhancement film, 11, light source, 12, reflection sheet, 13, diffusion sheet, 14, brightness enhancement sheet, 111, point light source, 112, light guide plate, 113, light source.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described below. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Referring to FIG. 1 to FIG. 2, an embodiment of the present invention includes:

A backlight module 1 includes a light source 11, a reflection sheet 12, and a diffusion sheet 13, the diffusion sheet 13 is disposed above the light exiting direction of the light source 11, and the reflection sheet 12 is disposed at a light exiting direction of the light source 11. Below, the base material of the diffusion sheet 13 is a nonwoven fabric, and the inside thereof includes a fibrous diffusion structure.

Further, the backlight module further includes a brightness enhancing sheet 14 disposed between the brightness enhancing sheet 14 and the light source 11.

In the liquid crystal television display device, the light source 11 includes a plurality of point light sources 111, and the light emitting directions of the plurality of point light sources 111 face the diffusion sheet 13.

In the mobile phone screen display device, the light source 11 includes a light guide plate 112 and a light source 113, and the light guide plate 112 includes a light incident surface on a side thereof, and the light source 113 is disposed adjacent to the light incident surface.

In the mobile phone screen display device, the light source 113 is a light emitting diode or a cold cathode fluorescent lamp.

Further, in the mobile phone screen display device, the light guide plate 112 includes a bottom portion at the bottom thereof The reflection sheet 12 is disposed below the bottom surface.

In the backlight module 1 of the present invention, the substrate of the diffusion sheet 13 is a non-woven fabric made of polypropylene fiber and polyester fiber.

A liquid crystal display device includes a backlight module 1 and a liquid crystal display panel 2.

In the liquid crystal television or mobile phone screen display device, the liquid crystal display panel 2 is disposed above the diffusion sheet 13.

In order to increase the display brightness of the liquid crystal display panel 2, at least one brightness enhancing sheet 3 is disposed between the liquid crystal display panel 2 and the diffusion sheet 13.

The working principle of the non-woven diffuser is mainly achieved by the fibers interspersed inside the nonwoven fabric. When the light passes through the inner fiber of the non-woven fabric, the optical phenomenon of reflection, refraction and scattering between the different fibers and the fiber and the fiber occurs, and the reciprocating light circulates to achieve uniform light of the entire non-woven fabric diffusion sheet. effect. Compared with the existing ordinary diffuser products, the non-woven diffuser has the advantages of simpler structure, more convenient operation and lighter overall structure. At the same time, because non-woven fabric is a new generation of environmentally friendly materials, compared with the existing diffuser products (mainly raw material comparison), it has the characteristics of water repellent, breathable, flexible, non-combustible, non-toxic, non-irritating and easy to decompose. . The non-woven fabric is non-toxic and odorless when burned, so that it does not pollute the environment, which is beneficial to the overall requirements of the liquid crystal display and the liquid crystal display module to meet the requirements of environmental protection.

In summary, the backlight module and the liquid crystal display device pointed out by the utility model have the characteristics of good light guiding effect and high cost performance compared with the backlight module and the liquid crystal display device made by the conventional diffusion sheet, and It is suitable for the promotion and application of related fields in the fields of LCD TVs, mobile phones, flat screens, etc., which are lighter and thinner, simpler to manufacture, and more environmentally friendly.

The above description is only an embodiment of the present invention, and thus does not limit the scope of the patent of the present invention. Any equivalent structure or equivalent flow transformation made by using the contents of the specification of the present invention, or directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of the present invention.

Claims

a backlight module, comprising: a light source, a reflection sheet and a diffusion sheet, wherein the diffusion sheet is disposed above a light exiting direction of the light source, the reflective sheet is disposed under a light exiting direction of the light source, and the diffusion The substrate of the sheet is a nonwoven fabric, and the inside thereof includes a fibrous diffusion structure.
The backlight module of claim 1 , wherein the backlight module further comprises a brightness enhancement sheet, the diffusion sheet being disposed between the brightness enhancement sheet and the light source.
The backlight module according to claim 1, wherein the light source comprises a plurality of point light sources, and the plurality of point light sources have a light emitting direction toward the diffusion sheet.
The backlight module of claim 1 , wherein the light source comprises a light guide plate and a light source, the light guide plate comprises a light incident surface at a side thereof, and the light source is adjacent to the light incident surface Settings.
The backlight module according to claim 4, wherein the light source is a light emitting diode or a cold cathode fluorescent lamp.
The backlight module according to claim 4, wherein the light guide plate comprises a bottom surface at a bottom thereof, and the reflection sheet is disposed below the bottom surface.
The backlight module according to claim 1, wherein the substrate is a polypropylene fiber and a polyester fiber.
A liquid crystal display device comprising the backlight module of any one of claims 1-7.
The liquid crystal display device according to claim 8, wherein the liquid crystal display device comprises a liquid crystal display panel, and the liquid crystal display panel is disposed above the diffusion sheet.
The liquid crystal display device according to claim 9, wherein at least one brightness enhancing sheet is disposed between the liquid crystal display panel and the diffusion sheet.