TWM494941U - Backlight module - Google Patents

Description

Backlight module

The present invention relates to a backlight module, and more particularly to a backlight module having a light-shielding film, a light-guiding film and a reflective film.

With the advancement of technology, various electronic devices are required to have a light-emitting function as an indication, illumination, and the like. Since the backlight module has the advantage of being thin, it has begun to be widely used and widely used.

1 is a schematic view showing a structure of a backlight module of the prior art. The backlight module 10 includes a light guide plate 11, a light source 12, a light receiving unit 13, a light shielding layer 14, and a reflection sheet 15. The light guide plate 11 has a light incident surface 111 and a light exit surface 112. The light source 12 is disposed on the light incident surface 111 of the light guide plate 11 , the light receiving unit 13 is disposed on the light emitting surface 112 of the light guide plate 11 , and the light shielding layer 14 is disposed on the light emitting surface 112 of the light guide plate 11 and the light receiving unit 13 . The reflection sheet 15 is disposed on the bottom surface 113 and the side surface 114 of the light guide plate 11, and the light guide plate 11 is disposed in the accommodation space formed by the reflection sheet 15 and the light shielding layer 14.

In the structure of the backlight module 10 of the prior art, in order to make the reflective sheet 15 smoothly engage with the light shielding layer 14, the reflective sheet 15 is convex at the edge, which not only increases the cumbersome process, but also affects the optical reflection effect. The brightness is lowered, and light leakage is severely generated. Further, at the junction of the side edge 151 of the reflective sheet and the light shielding layer 14, especially in the side edge 151 of the reflective sheet, residual stress will be formed, and the residual stress for long-term use will be the side edge 151 of the reflective sheet and the light shielding layer 14. Open, and the backlight module 10 If it is used for a long time, it will generate heat. Since the materials such as the light guide plate 11, the light shielding layer 14, and the reflection sheet 15 are different, the expansion coefficient is also different, and there is a potential risk of opening the rubber. For example, after the heat conduction and expansion of the light guide plate 11, the light shielding layer 14 may be used. The side edge 151 of the reflective sheet is stretched, and the high temperature is also likely to cause the adhesive force of the adhesive to decrease, and various factors may cause the tolerance of the backlight module to be impaired.

Moreover, since the light shielding layer 14 and the side edge 151 of the reflection sheet are separated from each other, the light of the light guide plate 11 is still leaked by the slight gap between the light shielding layer 14 and the side edge 151 of the reflection sheet, which affects light utilization efficiency and is easy to produce in manufacturing.瑕疵, once the film bonding method around the light guide plate is not correct or the manufacturing parameters are inaccurate, the long-term use is prone to local light leakage, resulting in product defects and flaws, such as partial debonding of the adhesive area, or thermal expansion and contraction of the light guide plate. The internal stress difference between the two layers of the film is too large, and a gap such as a gap is generated at the joint.

As a result of the job, the applicant has been able to overcome the above shortcomings by carefully testing and researching, and with a spirit of perseverance, to overcome the above shortcomings. Description.

The present invention proposes to create a groove on the light guiding layer, and incorporate an opaque filler in the groove to prevent light from leaking out and keep the light in the light guiding layer to increase the overall brightness and avoid the keyboard. An unnecessary light spot is generated outside, and since the filler is filled in the light guide layer groove and does not protrude from the surface of the light guide plate, the surface of the light guide plate is still flat, so that the upper light shielding layer and the lower side can be The reflective layer is indeed flat on the light guide plate, avoiding unnecessary protrusions, and increasing the adhesion and flatness of the light shielding layer and the light shielding layer to the light guiding layer.

The present invention provides a backlight module including a light guiding film including a front surface, a back surface opposite to the front surface, a plurality of edges, and a plurality of grooves, and a plurality of grooves One of the pair is equal to one of the edges, and each of the grooves is filled with an opaque filler; and a light shielding film is attached to the front surface and includes a plurality of light transmitting portions.

Preferably, each of the grooves is disposed adjacent to the corresponding edge and along the corresponding edge.

Preferably, the grooves are continuous with each other and in communication with each other.

Preferably, the strips are a plurality of segmented trenches or continuous trenches.

The present invention further provides a backlight module including a light guiding film including a front surface, a back surface opposite to the front surface, and a plurality of grooves, each of which is filled with an opaque filler; and a light shielding film It is attached to the front surface and includes a plurality of light transmitting portions.

The present invention further provides a backlight module including a light guiding film including a front surface, a back surface opposite to the front surface, and at least one groove, the groove is filled with an opaque filler; and a light shielding film It is attached to the front surface and includes a plurality of light transmitting portions.

The creation can fill the partitioning groove of the partition illumination in a one-time process step to achieve the requirement of the partition illumination. The creation can be applied to various devices that need to apply the backlight module to emit light, especially various actions including the backlight module. Devices such as notebooks, mobile phones, smart phones, tablets, tablet phones, keyboard covers, touch protection covers, keyboard back covers, touch back covers, and backlit keyboards.

10‧‧‧Backlight module

11‧‧‧Light guide

12‧‧‧Light source

13‧‧‧Light-receiving unit

14‧‧‧Lighting layer

15‧‧‧reflector

151‧‧‧reflecting sheet side edge

111‧‧‧Into the glossy surface

112‧‧‧Glossy

113‧‧‧ bottom

114‧‧‧ side

L‧‧‧Glossy

B‧‧‧Back

E‧‧‧ edge

X‧‧‧first light-emitting area

Y‧‧‧second light-emitting area

20‧‧‧Backlight module

21‧‧‧Light guide film

22‧‧‧Reflective film

23‧‧‧Shade film

24‧‧‧Light source

25‧‧‧Filling

26‧‧‧Light-receiving unit

211‧‧‧ positive

212‧‧‧ bottom

213, 214, 215, 216, 217, 218, 219‧‧‧ trenches

221‧‧‧ openings

231‧‧‧Transmission Department

232‧‧‧ inner surface

233‧‧‧ outer surface

FIG. 1 is a schematic view showing the structure of a backlight module of the prior art.

Figure 2a shows a schematic exploded view of the side view of the backlight module.

Fig. 2b is a top plan view showing the structure of the first embodiment of the light guiding film of the present invention.

FIG. 3 is a schematic view showing the structure of the backlight module of the present invention at the edge position.

FIG. 4 is a schematic view showing the structure of the backlight module of the present invention on the back side.

FIG. 5 is a schematic view showing the structure of the front backlight module of the present invention.

Fig. 6 is a top plan view showing the structure of the second embodiment of the light guiding film of the present invention.

Fig. 7 is a top plan view showing the structure of the third embodiment of the light guiding film of the present invention.

The present invention will be fully understood by the following examples, so that those skilled in the art can do so, but the implementation of the present invention may not be restricted by the following implementation cases; the pattern of the creation is The size, size and scale are not included. The size, size and scale of the original implementation of this creation are not limited by the schema of the creation.

The term "preferred" as used herein is non-exclusive and should be understood as "preferably, but not limited to", and any steps described or recited in any specification or claim can be performed in any order, and are not limited to the claim The order of the present invention should be determined only by the accompanying claims and its equal schemes, and should not be determined by the examples of the embodiments; the term "comprising" and its variations appear in the specification and claims. An open-ended term that does not have a limiting meaning and does not exclude other features or steps.

The light-shielding film described in the art is also known as a light-shielding plate, a light-shielding film, a light-shielding layer, and a light-shielding film in the art; the light-guiding film described in the art is also called a light guide plate in the technical field. The light guide sheet, the light guiding layer and the light guiding film; the reflective film described by the present invention is also referred to in the art as a reflecting plate, a reflecting sheet, a reflecting layer and a reflecting film; the light source described in the creation of the present invention is a light-emitting diode (LED); the light-shielding film described in the present invention is preferably It is selected from polyester (PET) film, polyethylene (PE) film, Mylar polyester film, Melinex polyester film, Teijin polyester film, Tetoron polyester film, Mylar light film, Mylar opaque film, light transmission. One of a film, an opaque film, and a black and white film.

Please refer to FIG. 2a and FIG. 2b of the present invention. FIG. 2a is a schematic exploded view showing the side view of the backlight module of the present invention. FIG. 2b is a schematic top view showing the structure of the first embodiment of the light guide film. The backlight module 20 includes a light guide film 21, a reflector 22, a light shielding film 23, a light source 24, and the like. The light guiding film 21 has a front surface 211 facing the light emitting surface L and a bottom surface facing the back surface B. 212, the light shielding film 23 is attached to the front surface 211 of the light guiding film 21, the reflective film 22 is attached to the bottom surface 212 of the light guiding film 21, and the reflective film 22 is provided with a plurality of openings 221, and each opening 221 is available. At least one light source 24 is embedded in the light guiding film 21, and the light source 24 is used to provide incident light to the light guiding film 21. After the incident light is diffused and mixed by the light guiding film 21, the light is supplied to the light emitting surface L, and the backlight module 20 is provided. The light-receiving unit 26 of the backlight module 20 can be assembled on the light-emitting surface L. The light-receiving unit 26 is preferably a mechanical keyboard unit or a touch keyboard panel.

The light shielding film 23 has an inner surface 232 and an outer surface 233. The inner surface 232 is a film surface close to the light guiding film 21 side, and the outer surface 233 is a film surface opposite to the inner surface 232 and away from the light guiding film 21 side. The film 23 further has a plurality of transparent portions 231. The light shielding film 23 is preferably a Mylar transparent film or a Mylar opaque film. If a Mylar transparent film is used, a white lacquer is printed on the inner surface 232 to form a white layer. The reflective layer has a black lacquer printed on the outer surface 233 to form a black light-shielding layer, and the inner surface 232 and the outer surface 233 are not printed at a position corresponding to the transparent portion 231 for light to penetrate and form a light-transmitting layer. When the Mylar opaque film is selected, the light-shielding film 23 is opened at a position corresponding to the plurality of light-transmitting portions 231, and a plurality of openings are opened in advance as the light-transmitting portions 231.

Viewed from the front surface 211, a plurality of grooves 213, 214, 215 and 216 are opened on the light guiding film 21 at a position close to and along the four edges E, and a reflective film 22 is attached under the light guiding film 21, The grooves 213, 214, 215 and 216 are filled with a filler 25 for shielding, blocking and reflecting light. The filler 25 can be divided into a liquid filling and a solid filling. The liquid filling is preferably a water gel or a liquid. Rubber, curable viscous liquid, etc., usually need to further incorporate colored pigments into the liquid filling, for example, adding white color to the water gel or liquid rubber to achieve the effect of shielding, blocking and reflecting light, solid filler Preferably, the material is opaque, for example, a strip-shaped opaque film, and the material is designed to be filled into the grooves 213, 214, 215 and 216, and the same effect of shielding, blocking and reflecting light can be achieved; When the water gel is used as the filler 25, the filler 25 can also be used as an adhesive for bonding the light shielding film 23 and the reflective film 22 to the light guiding film 21, and the light shielding film 23 above the light guiding film 21 is additionally generated. Lower reflective film 22 and light guiding film 2 1 bonding effect together.

FIG. 3 is a schematic view showing the structure of the backlight module of the present invention at the edge position. The present invention is to shield, block, and reflect the light that travels to the position of the light guiding film 21 at the end of the optical path near the edge E through the filler 25, and thus at the position of the four edges E of the light guiding film 21, It is not necessary to further extend the light-shielding film 23 and the reflective film 22 to the side surface of the light-guiding film 21 as in the prior art, and then bond them together so that the light-shielding film 23 and the reflection film 22 are directly bonded to each other, and the light-shielding film 23 is created. The reflective film 22 is attached to the front surface 211 and the back surface 212 of the light guiding film 21, respectively, such that the laminated structure composed of the light guiding film 21, the light shielding film 23 and the reflective film 22 at the edge E position. Within, there will be no residual stress, and the laminated structure after lamination is very flat, very easy to make, easy to paste, and can be used for bonding, gluing, hot melting and ultrasonic welding. Carry out the cooperation, even if it is used for a long time, it will not open. problem.

FIG. 4 is a schematic view showing the structure of the backlight module of the present invention on the back side. When the backlight module 20 is viewed from the back surface B, the reflective film 22 is attached to the bottom surface of the light guide film facing the back surface B. The reflective film 22 is provided with a plurality of openings 221, and each of the openings 221 is at least A light source 24 is embedded in a light directing film (not shown) for providing incident light to the light directing film, the incident light traveling to the edge E, being shielded, blocked and reflected by the filler 25. The light is concentrated and retained in the light guiding film as much as possible, and after being diffused and mixed by the light guiding film, light is supplied to the light emitting surface.

FIG. 5 is a schematic view showing the structure of the front backlight module of the present invention. When the backlight module 20 is viewed from the light-emitting surface L, it can be observed that the light-shielding film 23 is attached to the front surface of the light-guiding film toward the light-emitting surface L, and the plurality of light-transmitting portions 231 on the light-shielding film 23 are arranged according to a predetermined design. A particular pattern, such as a particular pattern arranged in a QWERT keyboard, as disclosed in Figure 5, the light traveling within the light directing film will be obscured, blocked, and reflected by the filler 25 when it reaches the edge E. As a result, the light is concentrated and retained in the light guiding film, and after being diffused and mixed by the light guiding film, light is supplied to the light emitting surface L, and the plurality of light transmitting portions 231 constituting the specific pattern can emit light.

It should be noted that the arrangement of the filler 25 is not limited to be disposed near and along the edge E of the light guiding film 21, and in the backlight module having the partition light emitting design, the filler 25 may be disposed on the light guiding film. Any position on 21 to split the light to achieve the effect of the partition.

Fig. 6 is a top plan view showing the structure of the second embodiment of the light guiding film of the present invention. The second embodiment includes all the features of the first embodiment. For the backlight module that requires partition illumination, a plurality of trenches 213 may be formed on the light guiding film 21 except at positions close to and along the four edges E. In addition to 214, 216, 217, 218, and 219, a trench 215 may be formed at a position where light emission division is required, and the light guiding film 21 is divided into a first light emitting region X and a second light emitting region Y, The grooves 215 each block, shield, and reflect the light in the first light-emitting region X and the second light-emitting region Y, thereby causing the first light-emitting region X and the second light-emitting region Y to form two rectangular blocks that are independently illuminated.

However, it is worth noting that the number of divided regions of the light guiding film and the shape of the divided region are not limited to two regions and rectangles, and the number of divided regions and the shape of the divided regions are not limited, and the number of divided regions is preferably at least according to actual needs. For more than two areas, the shape of the divided area is preferably a rectangular, triangular or trapezoidal shape, and the number of grooves planned on the light guiding film can be one-time in the process step. At the same time, filling each groove, or partitioning the light-emitting dividing groove, to meet the requirements of the partition illumination.

Fig. 7 is a top plan view showing the structure of the third embodiment of the light guiding film of the present invention. The third embodiment includes all the features of the first embodiment and the second embodiment. It should be noted that the plurality of grooves of the present invention may be connected to each other in a continuous manner, that is, a plurality of grooves. Between each other, it may be a continuous body. Viewed from the front surface 211, a plurality of grooves 213, 214, 215 and 216 are opened on the light guiding film 21 at a position close to and along the four edges E, and the grooves 213 are opened. 214, 215 and 216 are continuous and in communication with each other to form a single continuous groove, and the grooves 213, 214, 215 and 216 are filled with a filler 25 for shielding, blocking and reflecting light.

The above embodiments can be combined or replaced with each other arbitrarily, thereby deriving more implementations, but without departing from the scope of the creation of the present invention, further provide more creative implementations such as:

Embodiment 1 : A backlight module comprising a light guiding film comprising a front surface, a back surface opposite to the front surface, a plurality of edges, and a plurality of grooves, wherein one of the plurality of grooves corresponds to an edge thereof One of each of the grooves is filled with an opaque filler; A light shielding film attached to the front surface and including a plurality of light transmitting portions.

Embodiment 2: The backlight module of Embodiment 1, further comprising one of: a plurality of light sources for providing incident light to the light guiding film; and a reflective film attached to the back surface, It also contains a plurality of openings.

The backlight module of embodiment 2, wherein one of the reflective film and the light guiding film is provided with a plurality of openings at positions corresponding to the light sources, and each opening is provided for at least one These light sources.

Embodiment 4: The backlight module of Embodiment 1, wherein one of the strips of grooves is disposed at a position close to the corresponding edge and disposed along the corresponding edge, the grooves The tanks are continuous with each other and communicate with each other.

Embodiment 5: The backlight module of Embodiment 1, wherein the opaque filler is used for shielding, blocking or reflecting light traveling in the light guiding film, and is selected from a liquid filling and a One of the solid fillers selected from the group consisting of a water gel, a liquid rubber, and a curable viscous liquid, the solid filler being selected from one of a strip of opaque film.

The backlight module of claim 1, wherein the light shielding film is selected from the group consisting of a polyester film (PET) film, a polyethylene (PE) film, a Mylar polyester film, and a Melinex polyester film. A Teijin polyester film, a Tetoron polyester film, a Mylar light transmissive film, a Mylar opaque film, and a black and white film.

The backlight module of the first embodiment, wherein the light shielding film is a light transmissive film and comprises a plurality of light transmitting portions, an inner surface and an outer surface, wherein the inner surface is such that the light shielding film is adjacent to the light shielding film. a surface of the cladding space, the outer surface being a surface of the light shielding film relative to the inner surface The inner surface is formed with one layer selected from the group consisting of an opaque layer, a reflective layer and a light shielding layer, the outer surface being formed with an opaque layer, a reflective layer and a light shielding layer. a layer, wherein the reflective layer is formed by applying a layer of white lacquer formed by applying a layer of black lacquer, the layer formed on the inner surface and the layer formed on the outer surface are not Covering the light transmitting portions.

The backlight module of the seventh embodiment, wherein the light shielding film is an opaque film, and the light shielding film comprises a plurality of openings formed by die cutting, and is used as The light transmitting portions.

Embodiment 9: A backlight module includes a light guiding film including a front surface, a back surface opposite to the front surface, and a plurality of grooves, each of which is filled with an opaque filler; and a light shielding film It is attached to the front surface and includes a plurality of light transmitting portions.

Embodiment 10: A backlight module comprising a light guiding film comprising a front surface, a back surface opposite to the front surface, and at least one trench, the trench is filled with an opaque filler; and a light shielding film It is attached to the front surface and includes a plurality of light transmitting portions.

This creation can be widely applied to various devices that need to use a backlight module to emit light, especially various mobile devices including a backlight module, such as a notebook computer, a mobile phone, a smart phone, a tablet computer, a tablet phone, and a keyboard protection. Cover, touch protection cover, keyboard back cover, touch back cover and backlit keyboard.

The embodiments of the present invention can be arbitrarily combined or replaced with each other, thereby deriving more implementations, but the scope of the protection of the present invention is not limited by the scope of the creative protection. The record is subject to change.

L‧‧‧Glossy

E‧‧‧ edge

X‧‧‧first light-emitting area

Y‧‧‧second light-emitting area

21‧‧‧Light guide film

25‧‧‧Filling

211‧‧‧ positive

213, 214, 215, 216, 217, 218, 219‧‧‧ trenches

Claims (9)

A backlight module includes: a light guiding film comprising a front surface, a back surface opposite to the front surface, a plurality of edges, and a plurality of grooves, wherein one of the plurality of grooves corresponds to one of the edges, And each of the grooves is filled with an opaque filler; and a light shielding film is attached to the front surface and includes a plurality of transparent portions. The backlight module of claim 1, further comprising one of: a plurality of light sources for providing incident light to the light guiding film; and a reflective film attached to the back surface and including Multiple openings. The backlight module of claim 2, wherein one of the reflective film and the light guiding film is provided with a plurality of openings at positions corresponding to the light sources, and each opening is configured to provide at least one of the openings light source. The backlight module of claim 1, wherein one of the strips is disposed adjacent to the corresponding edge and along the corresponding edge, the strips are They are continuous and connected to each other. The backlight module of claim 1, wherein the opaque filler is used for shielding, blocking or reflecting light traveling in the light guiding film, and is selected from a liquid filling and a solid filling. One of the liquid fillers is selected from the group consisting of a water gel, a liquid rubber, and a curable viscous liquid, the solid filler being selected from one of a strip of opaque film. The backlight module of claim 1, wherein the light shielding film is a light transmissive film and comprises a plurality of light transmitting portions, an inner surface and an outer surface, wherein the inner surface is the light shielding film adjacent to the coating a surface of the space, the outer surface being a surface of the light shielding film opposite to the inner surface, the inner surface being formed with one layer selected from the group consisting of an opaque layer, a reflective layer and a light shielding layer, the outer surface being formed Having a layer selected from the group consisting of an opaque layer, a reflective layer, and a light-shielding layer, wherein the reflective layer is formed by applying a layer of white lacquer formed by applying a layer of black lacquer. The layer on the inner surface and the layer formed on the outer surface do not cover the light transmitting portions. The backlight module of claim 6, wherein the light shielding film is an opaque film, and the light shielding film comprises a plurality of openings formed by punching and used for the same Light transmitting portion. A backlight module includes: a light guiding film comprising a front surface, a back surface opposite to the front surface, and a plurality of grooves, each of which is filled with an opaque filler; and a light shielding film Attached to the front side and including a plurality of light transmitting portions. A backlight module includes: a light guiding film comprising a front surface, a back surface opposite to the front surface, and at least one groove, the groove is filled with an opaque filler; and a light shielding film is Attached to the front side and including a plurality of light transmitting portions.