TWM491852U - Backlight module and liquid-crystal display device using the same - Google Patents

Abstract

A backlight module is provided. The backlight module includes a light source, a reflect plate and a diffusion plate, wherein the diffusion plate is disposed under the light emitting direction of the light source. The base material of the diffusion plate is non-woven fabric, wherein an optical coating is disposed on the surface of the non-woven fabric. A liquid-crystal display device including the backlight module and a liquid-crystal display panel is also provided, wherein the liquid-crystal display panel is disposed on a diffusion plate. At least a brightness enhancement film is disposed between the liquid-crystal display panel and the diffusion plate. The backlight module and the liquid-crystal display device using the same has the advantage of good optical uniformity, simple making, slim size and low price. The backlight module and the liquid-crystal display device using the same are suitable for LCD TV, tablet, mobile phone screen and other related fields.

Description

Backlight module and liquid crystal display device

The present invention relates to the field of structural design of a liquid crystal display system, and more particularly to a backlight module and a liquid crystal display device.

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 screen, the liquid crystal display screen generally has to be used together with a light source. Due to the nature of the liquid crystal, this light source is generally placed on the back of the liquid crystal display screen, 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 disclosed so far, the diffusion sheets in the backlight are mostly made of 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.

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

The present invention provides a backlight module comprising a light source, a reflection sheet and a diffusion sheet, wherein the diffusion sheet is disposed above the light exit direction of the light source, the reflection sheet is disposed below the light exit direction of the light source, the substrate of the diffusion sheet is non-woven, and the surface of the non-woven fabric is disposed. There is an optical coating.

In an embodiment of the present invention, the backlight module further includes a brightness enhancement sheet disposed between the brightness enhancement sheet and the light source.

In an embodiment of the present creation, the light source includes a plurality of point light sources, and the light emitting directions of the plurality of point light sources are toward the diffusion sheet.

In an 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 on a side thereof, and the light source is disposed adjacent to the light surface.

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

In an 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 an embodiment of the present invention, the optical coating is uniformly applied to the surface of the nonwoven fabric or penetrates into the interior of the nonwoven fabric through the surface, and the optical coating is a vinyl acetate coating, an acrylic coating or an OCA optical adhesive coating.

The present invention further provides a liquid crystal display device, comprising: a backlight module and a liquid crystal display panel, wherein the backlight module comprises a light source, a reflection 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, the substrate of the diffusion sheet is a non-woven fabric, and the surface of the non-woven fabric is provided with an optical coating.

In an embodiment of the present creation, 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 backlight module and the liquid crystal display device pointed out by the present invention adopt a special performance non-woven fabric to form a diffusion sheet instead of the conventional PET-based diffusion sheet or diffusion plate, which has good light guiding uniformity, simple manufacture, light size and low price. Features, suitable for LCD TV, tablet, mobile phone screen and other related applications.

1‧‧‧Backlight module

11‧‧‧Light source

111‧‧‧ point light source

112‧‧‧Light guide plate

113‧‧‧Light source

12‧‧‧reflector

13‧‧‧Diffuser

14‧‧‧Splends

2‧‧‧LCD panel

3‧‧‧Brightening film

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

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

The technical solutions in the present creative embodiment will be described clearly and completely 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 in the present invention without creative efforts are within the scope of the present invention.

Referring to FIG. 1 to FIG. 2, the present creative embodiment includes:

A backlight module 1 comprising: a light source 11, a reflection sheet 12, and an expansion In the sheet 13, the diffusion sheet 13 is disposed above the light-emitting direction of the light source 11, the reflection sheet 12 is disposed below the light-emitting direction of the light source 11, the base material of the diffusion sheet 13 is a non-woven fabric, and the surface of the non-woven fabric is provided with an optical coating.

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. 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 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 surface at the bottom thereof, and the reflection sheet 12 is disposed below the bottom surface.

In the backlight module 1, the optical coating is uniformly coated on the surface of the non-woven fabric or penetrates into the interior of the non-woven fabric through the surface, and the optical coating is a vinyl acetate coating, an acrylic coating or an OCA optical adhesive coating.

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

In the liquid crystal television or the 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 non-woven fabric. When light passes through the inner fibers of the non-woven fabric, it will show, reflect and refract between the different fibers and between the fibers and the fibers. By shooting these optical phenomena, the reciprocating light circulation achieves the effect of uniform light of the entire non-woven diffusion sheet. Compared with the existing ordinary diffusion sheet products, the non-woven diffusion sheet 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. When the non-woven fabric is burned, it is non-toxic and tasteless, so 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. The addition of the optical coating further increases the uniform effect of the light.

In summary, the backlight module and the liquid crystal display device pointed out by the present invention 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 are applied to LCD TVs and mobile phones, flat screens and other fields have the advantages of slimmer, simpler manufacturing and more environmentally friendly products, which are suitable for promotion and application in related fields.

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 process transformation made by using the content of the present specification, or directly or indirectly applied to other related technical fields, The same is included in the scope of patent protection of this creation.

1‧‧‧Backlight module

11‧‧‧Light source

111‧‧‧ point light source

12‧‧‧reflector

13‧‧‧Diffuser

14‧‧‧Splends

2‧‧‧LCD panel

3‧‧‧Brightening film

Claims (10)

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 reflective sheet is disposed under a light exiting direction of the light source, the diffusion sheet The substrate is a non-woven fabric, and the surface of the non-woven fabric is provided with an optical coating. The backlight module of claim 1, wherein the backlight module further comprises a brightness enhancing sheet, the diffusion sheet being disposed between the brightness enhancing sheet and the light source. The backlight module of 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, and the light guide plate comprises a light incident surface on a side thereof, the light source is adjacent to the light source. Set into the glossy surface. The backlight module of claim 4, wherein the light source is a light emitting diode or a cold cathode fluorescent lamp. The backlight module of 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 of claim 1, wherein the optical coating is uniformly coated on the surface of the non-woven fabric or penetrates into the interior of the non-woven fabric through a surface, and the optical coating is a vinyl acetate coating or an acrylic coating. Layer or OCA optical adhesive coating. 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 of claim 9, wherein at least one brightness enhancing sheet is disposed between the liquid crystal display panel and the diffusion sheet.