TWM497292U - Light leakage prevention backlight module - Google Patents

Description

Anti-light leakage backlight module

The present invention relates to a backlight module, and more particularly to a backlight module for a keyboard.

Nowadays, computers have become widely used as an indispensable tool. Through the input devices around the computer, a large amount of electronic information can be quickly circulated through the Internet. Among them, the keyboard is one of the common input devices. On the other hand, when the user uses the keyboard when the surrounding environment is dim, the characters or symbols on the keys cannot be clearly recognized due to insufficient external light, which makes the input difficult. In order to improve the above situation, there are currently a variety of illuminated keyboards on the market.

At present, most of the illuminated keyboards use the backlight module as a light source to achieve the function of emitting light. The backlight module includes a light guide plate and a light-emitting element. The light-emitting element is disposed on one side of the light guide plate, and the light emitted by the light-emitting element is diverged through the guide of the light guide plate.

However, the backlight module often needs to design one or more holes to provide a positioning post or other structure, which causes the light emitted by the light-emitting element to leak and diverge from the hole, thereby causing light leakage. The occurrence of this light leakage phenomenon will affect the comfort when using the keyboard, causing inconvenience and trouble in use.

In view of this, in order to achieve the above objectives, the creator has devoted himself to researching and cooperating with the application of theory, and finally proposed a reasonable design and effective improvement of the above-mentioned shortcomings. Lost in the creation.

One of the purposes of this creation is to provide a backlight-proof backlight module that avoids light leakage at the broken holes and affects the comfort of using the keyboard.

In order to achieve the above purpose, the present invention is a light-proof backlight module comprising a substrate, a light shielding sheet, a light guiding plate, a light-emitting element, a reflective sheet and an adhesive. The light shielding sheet has opposite first and second surfaces, and the light shielding sheet is provided with a first hole penetrating through the first surface and the second surface, and the light shielding sheet is bonded to the substrate by the first surface. The light guide plate is coupled to the second surface, and the light guide plate is provided with a second hole having a larger aperture than the first hole, corresponding to the first hole, wherein the light shielding piece is on one side of the first hole compared to the light guide plate. An extension portion is formed on one side of the second hole, and the light shielding sheet is provided with a first light shielding portion on the extension portion. The light emitting element is disposed on a light incident surface of the light guide plate. The reflective sheet is coupled to one side of the light guide plate, and the reflective sheet is provided with a third broken hole having a smaller aperture than the second broken hole corresponding to the second broken hole, and the reflective sheet is opposite to the light guide plate at one side of the third broken hole. There is a glued section on one side of the two broken holes. The adhesive is disposed between the extending portion and the bonding portion, and the bonding portion is connected to the extending portion and seals the light guide plate on one side of the second broken hole to block the light of the light emitting element from being emitted from the second broken hole.

Compared with the prior art, the light guide plate of the backlight module of the present invention has a distance from the light shielding plate at a position of the hole, so that the light shield has an extension with respect to the light guide plate. On the other hand, the reflective sheet also has a bonding section with respect to the light guide plate. Therefore, the adhesive is disposed between the extended section and the adhesive section, and the side of the light guide plate is sealed. According to this, when the light of the light emitting element is conducted through the light guide plate When the light is not emitted from the side where the light guide plate is retracted, light leakage does not occur at the broken hole, and the comfort when using the keyboard is maintained.

1‧‧‧Backlight module

2‧‧‧ keyboard

3‧‧‧Circuit board

4‧‧‧ buttons

5‧‧‧Breaking

6‧‧‧Positioning column

10‧‧‧Substrate

20‧‧ ‧ shading film

200‧‧‧ first hole

201‧‧‧ first surface

202‧‧‧ second surface

21‧‧‧Extension

22‧‧‧First Shade

221‧‧‧Black ink zone

222‧‧‧White ink zone

30‧‧‧Light guide

31‧‧‧Reflection points

300‧‧‧Second hole

40‧‧‧Lighting elements

50‧‧‧reflector

500‧‧‧ third hole

51‧‧‧bonding section

60‧‧‧Viscos

70‧‧‧Adhesive layer

80‧‧‧Second shade

1 is a cross-sectional view of the backlight module of the present invention; FIG. 2 is a partial enlarged view of the portion A of FIG. 1; FIG. 3 is another schematic diagram of the backlight module of the present invention; A further embodiment of the backlight module for preventing leakage of light is shown in FIG. 5; FIG. 5 is a schematic diagram of another embodiment of the backlight module for preventing leakage of light; FIG. 6 is a broken hole position of the backlight module for preventing leakage of light. schematic diagram.

The detailed description and technical content of the present invention are described below with reference to the drawings, but the drawings are only for reference and explanation, and are not intended to limit the creation.

Please refer to FIG. 1 and FIG. 2 , which are respectively a sectional view and a partially enlarged schematic view of the backlight module for preventing light leakage. The backlight module 1 of the present invention comprises a substrate 10, a light shielding film 20, a light guiding plate 30, a light emitting element 40, a reflection sheet 50 and an adhesive 60. The light shielding sheet 20, the light guide plate 30, and the reflection sheet 50 are sequentially disposed on one side of the substrate 10. In this embodiment, the backlight module 1 is further An adhesive layer 70 is disposed, and the adhesive layer 70 is disposed between the substrate 10 and the light shielding sheet 20.

Furthermore, the present invention also provides a keyboard 2 having a backlight module that prevents light leakage. The keyboard 2 includes the backlight module 1 of the present invention, a circuit board 3, and a plurality of buttons 4. The circuit board 3 is disposed on the substrate 10, and the keys 4 are coupled to the circuit board 3. In addition, the backlight module 1 includes at least one hole 5, which can be used to set the positioning post 6 or other structures and the like.

The substrate 10 may be made of a material such as metal such as aluminum. The substrate 10 serves as a support plate for arranging the buttons 4. The light shielding sheet 20 is preferably provided as a plastic film. The light shielding sheet 20 has a first surface 201 and a second surface 202 opposite to each other. The light shielding sheet 20 is provided with a first hole 200 penetrating the first surface 201 and the second surface 202. The light shielding sheet 20 is bonded to the substrate 10 by the first surface 201.

The light guide plate 30 is coupled to the second surface 202 of the light shielding sheet 20. The light guide plate 30 is provided with a second hole 300 having a larger diameter than the first hole 200 in the first hole 200, wherein the light shielding plate 20 is on one side of the first hole 200. An extension 21 is formed on one side of the second hole 300 in the light guide plate 30. The light shielding sheet 20 is provided with a first light shielding portion 22 on the extending portion 21.

The light emitting element 40 is preferably an LED element. The light-emitting element 40 is disposed on a light-incident surface of the light guide plate 30. The light-incident surface may be a side surface of the light guide plate 30, or a through-hole may be formed in the light guide plate 30 and the light-emitting element 40 may be in the through-hole. The side wall of the through hole is the light incident surface. Light emitted from the light-emitting element 40 is conducted through the light guide plate 30.

The reflection sheet 50 is coupled to one side of the light guide plate 30. The reflection sheet 50 is provided with a third hole 500 having a smaller aperture than the second hole 300 in the second hole 300 of the light guide plate 30. The reflective sheet 50 has a bonding portion 51 on one side of the third hole 500 opposite to the light guide plate 30 on one side of the second hole 300.

The bonding section 51 is connected to the extension 21 . The bonding section 51 is connected to the extension 21 and seals the light guide plate 30 on one side of the second hole 300, thereby blocking the light of the backlight module 1 from being emitted from the second hole 300. In the present embodiment, an adhesive 60 is disposed between the extending portion 21 and the bonding portion 51. The extending portion 21 and the bonding portion 51 are adhered to each other by the adhesive 60. The adhesive 60, preferably, is a light absorbing latex.

In more detail, the adhesive layer 70 is disposed between the substrate 10 and the first surface 201 of the light shielding sheet 20. The adhesive segment 51 is bonded to the second surface 202 of the light shielding sheet 20 through the adhesive layer 70. Preferably, the bonding section 51 is a structure that is bent toward the light shielding sheet 20. In actual implementation, the bonding section 51 can be bent by thermoforming.

In addition, the first light shielding portion 22 covers and extends from the side edge of the first hole 200. The setting range of the first light shielding portion 22 may be set to cover all of the extending portion 21, or the setting range of the first light shielding portion 22 may be slightly smaller/slightly larger than the length of the extending portion 21, and the first light shielding portion 22 may be visible. Adjust the actual usage status (such as whether buttons are set nearby). Preferably, the first light shielding portion 22 is a black ink region 221 formed by printing, and the first light shielding portion 22 is disposed to block light leaking from above the second hole 300 of the light guide plate 30.

Please refer to Figure 3 and Figure 4 for the back of the creation. A schematic diagram of two other implementations of the optical module. As shown in FIG. 3, the difference from FIG. 2 is that the first light shielding portion 22 further includes a white ink region 222. The white ink region 222 is overlapped under the black ink region 221, and the area of the white ink region 222 is less than or equal to the area of the black ink region 221. The present invention increases the shading effect of the first light blocking portion 22 by the manner in which the white ink region 222 is superposed on the black ink region 221.

4 is different from FIG. 2 in that the backlight module 1 further includes a second light blocking portion 80 having the same structure as the first light blocking portion 22 . In this embodiment, the second light shielding portion 80 is disposed on a side of the bonding portion 51 facing the light guide plate 30. By the provision of the second light blocking portion 80, light leaking from below the second hole 300 of the light guide plate 30 can be blocked, and the effect of preventing light leakage can be enhanced.

Please refer to FIG. 5 again, which is a schematic diagram of still another implementation of the backlight module for preventing light leakage. The difference from FIG. 1 is that the light guide plate 30 is further provided with a plurality of reflection points 31. The arrangement of the reflection points 31 can increase the reflection efficiency of the light guide plate 30. Accordingly, the backlight module 1 of the present invention has the effect of preventing light leakage, and further increases the light-emitting effect of the backlight module 1.

Please refer to FIG. 6 as a schematic diagram of the broken hole position of the backlight module for preventing light leakage. The backlight module 1 for preventing light leakage is provided corresponding to the position of the hole 5. As can be seen from FIG. 6, the positions of the holes 5 are substantially at the boundary of the three buttons 4 in the keyboard 2, which is not limited by the actual implementation.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the scope of the patents of the present invention. Other equivalent variations of the patent spirit using the present invention are all within the scope of the patent.

1‧‧‧Backlight module

2‧‧‧ keyboard

3‧‧‧Circuit board

4‧‧‧ buttons

5‧‧‧Breaking

6‧‧‧Positioning column

10‧‧‧Substrate

20‧‧ ‧ shading film

21‧‧‧Extension

221‧‧‧Black ink zone

30‧‧‧Light guide

40‧‧‧Lighting elements

50‧‧‧reflector

51‧‧‧bonding section

60‧‧‧Viscos

70‧‧‧Adhesive layer

Claims (11)

A light-proof backlight module includes: a substrate; a light shielding sheet having a first surface and a second surface, wherein the light shielding sheet is provided with a first through the first surface and the second surface a louver, the visor is bonded to the substrate by the first surface; a light guide plate is coupled to the second surface, and the light guide plate is provided with a hole larger than the first hole for the first hole a second hole, wherein the light shielding sheet has an extension portion on one side of the first hole and a side of the second hole in the light guide plate, and the light shielding sheet is in the extension portion a light shielding element is disposed on a light incident surface of the light guide plate; and a reflective sheet is coupled to one side of the light guide plate, and the reflective sheet is provided with an aperture corresponding to the second hole a third hole that is smaller than the second hole, the reflection sheet has a bonding portion on one side of the third hole and one side of the second hole in the light guide plate. The bonding section connects the extension and seals the light guide plate on one side of the second hole to block the illuminating element Light emitted from the second hole to break. The anti-light leakage backlight module of claim 1, wherein the extension portion and the bonding portion are adhered to each other by an adhesive. The anti-light leakage backlight module of claim 1, further comprising an adhesive layer disposed on the substrate and the first surface of the light shielding sheet between. The anti-light leakage backlight module of claim 1, wherein the first light shielding portion covers all of the extensions. The anti-light leakage backlight module of claim 1, wherein the first light shielding portion is a black ink region printed. The anti-light leakage backlight module of claim 5, wherein the first light shielding portion further comprises a white ink region, the white ink region is overlapped under the black ink region, and the white ink region has an area equal to or less than The area of the black ink zone. The anti-light leakage backlight module of claim 1, further comprising a second light shielding portion disposed on a side of the bonding portion toward the light guide plate. The anti-light leakage backlight module of claim 1, wherein the light guide plate is provided with a plurality of reflection points. The anti-light leakage backlight module of claim 2, wherein the adhesive is a light absorbing latex. The anti-light leakage backlight module of claim 1, wherein the bonding section is bent and formed by hot pressing. A keyboard having a backlight module for leak prevention according to any one of claims 1 to 10, comprising a circuit board and a plurality of buttons, the circuit board being disposed on the substrate, the buttons being respectively coupled to the circuit board .