TWI668392B - Keyboard backlight module - Google Patents

Abstract

The invention discloses a keyboard backlight module, which comprises a light shielding sheet, a light guiding plate, a metal plate and a light emitting element. The visor has a lower surface. The light guide plate has a first opening and a light emitting surface, and the light emitting surface is disposed on the lower surface of the light shielding sheet. The metal plate has a second opening and a reflecting surface. The first opening is corresponding to the second opening to form a consistent hole. The reflecting surface is disposed toward the light guide plate, and the reflecting surface is provided with a plurality of reflecting structures. The light emitting element is disposed in the through hole.

Description

Keyboard backlight module

The invention relates to a backlight module of a keyboard.

The rapid development of today's electronic technology and information industry has led to the development of various electronic devices that are light, thin, short, small and powerful. For example, computers, notebook computers, tablet computers, smart phones, etc., have become indispensable electronic devices for modern people in daily life or work. In most cases, the user uses an input device such as a mouse or a keyboard to operate the electronic device, and the keyboard is most conveniently used.

In order to clearly see the symbols on each button in a low-light environment, a technician introduces a light source technology into the keyboard to develop an illuminated keyboard with a backlight module. At present, the illuminated keyboard on the market is provided with a backlight module at the bottom of the button module, and the backlight module comprises a structure such as a light guide plate, a reflection plate and a light-emitting element. The illuminating element is disposed on the light guide plate, so that the light can be guided by the light guide plate to the bottom of the entire keyboard, and the light is projected onto the back of the keycap of each button. The light is transmitted through the key surface or the periphery of the button, so that the user can see the character symbol on the key cap.

The main function of the reflector is to reflect light back to the light guide. Generally, the material of the reflector is a white plastic plate, such as polyethylene terephthalate (PET), which has no conductive effect. Therefore, some of the illuminated keyboards may be provided with a metal plate at the bottom of the backlight module, or the reflective plate may be directly replaced by a metal plate to prevent the keyboard from being damaged by electrostatic discharge (ESD). However, the additional layer of metal plate will increase the thickness of the backlight module, which is not conducive to the thin design of the illuminated keyboard. The reflection effect of the metal plate instead of the reflection plate is poor, and the light-emitting effect of the illuminated keyboard is deteriorated and the brightness is lowered, which is necessary for improvement.

In view of the above problems, the main object of the present invention is to provide a keyboard backlight module including a metal plate having a reflective surface, and the reflective surface is provided with a plurality of reflective structures to solve the conventional keyboard backlight module to avoid electrostatic discharge. Damage, and can not achieve the problem of thinning and providing sufficient brightness at the same time.

To achieve the above objective, the present invention provides a keyboard backlight module including a light shielding sheet, a light guiding plate, a metal plate, and a light emitting element. The visor has a lower surface. The light guide plate has a first opening and a light emitting surface, and the light emitting surface is disposed on the lower surface of the light shielding sheet. The metal plate has a second opening and a reflecting surface. The first opening is corresponding to the second opening to form a consistent hole. The reflecting surface is disposed toward the light guide plate, and the reflecting surface is provided with a plurality of reflecting structures. The light emitting element is disposed in the through hole.

According to an embodiment of the invention, the reflecting surface is an aluminum layer, and the reflecting structures are disposed on the aluminum layer.

According to an embodiment of the invention, the material of the metal plate comprises aluminum, copper, or a combination thereof.

According to an embodiment of the invention, the reflective structures are respectively a strip-shaped microstructure.

According to an embodiment of the invention, the reflective structures are arranged parallel to each other on the reflective surface.

According to an embodiment of the invention, the reflective structures are parallel to one of the sidewalls of the second opening.

According to an embodiment of the invention, the metal plate includes a conductive region and a non-conductive region with respect to a surface of the reflective surface.

According to an embodiment of the invention, the metal plate is coated with a non-conductive layer with respect to the surface portion of the reflecting surface to form a non-conductive region, and the region not coated with the non-conductive layer is a conductive region.

According to an embodiment of the invention, the non-conductive layer has high thermal conductivity.

According to an embodiment of the present invention, a colloid is disposed on a periphery of a lower surface of the light shielding sheet, and the metal plate and the light shielding sheet are connected by a colloid.

According to the above, the keyboard backlight module according to the present invention comprises a light shielding sheet, a light guiding plate and a metal plate. The light guide plate is disposed on the lower surface of the light shielding sheet, and the reflecting surface of the metal plate is disposed toward the light guide plate. The reflective surface of the metal plate reflects the light to the light guide plate and is used for total reflection, so that the metal plate can be directly used as a reflector to achieve thinness. The effect of modeling. Moreover, the reflective surface is provided with a plurality of reflective structures, and the reflectivity of the reflective surface can be raised by the reflective structure to provide sufficient brightness. At the same time, the conductive properties of the metal plate can be utilized to achieve the protection effect of the electrostatic discharge.

In addition, a non-conductive layer may be coated on the bottom surface portion of the metal plate to form a non-conductive region, and a non-conductive layer may be a conductive region. In addition to the protective effect of the above-mentioned electrostatic discharge through the conductive region, the heat radiation inside the keyboard backlight module (for example, the heat radiation emitted by the circuit board) can be absorbed through the non-conductive region, and transmitted to the metal plate to achieve the heat dissipation effect. .

1‧‧‧Keyboard backlight module

10‧‧ ‧ shading film

11‧‧‧ Lower surface

12‧‧‧ upper surface

13‧‧‧Lighting Department

20‧‧‧Light guide

21‧‧‧First opening

22‧‧‧Glossy

30‧‧‧Metal plates

31‧‧‧Second opening

311, 312‧‧‧ side wall

32‧‧‧reflecting surface

321‧‧‧Reflective structure

33‧‧‧Conducting area

34‧‧‧non-conducting area

40‧‧‧Lighting elements

41‧‧‧ boards

50‧‧‧colloid

A‧‧‧ area

FIG. 1 is an exploded perspective view of a keyboard backlight module according to an embodiment of the invention.

2 is a partial cross-sectional view showing the combination of the keyboard backlight module shown in FIG. 1.

3 is a partially enlarged schematic view showing the second opening of the metal plate of the light-emitting element shown in FIG. 1.

4 is a schematic bottom view of the metal plate shown in FIG. 1.

In order to enable the reviewing committee to better understand the technical contents of the present invention, the preferred embodiments are described below.

1 is an exploded perspective view of a keyboard backlight module according to an embodiment of the present invention, and FIG. 2 is a partial cross-sectional view of the keyboard backlight module shown in FIG. 1 , which is also referred to FIG. 1 and FIG. 2 . In this embodiment, the keyboard backlight module 1 includes A light shielding sheet 10, a light guide plate 20, a metal plate 30, and a light emitting element 40. The light shielding sheet 10, the light guide plate 20, and the metal plate 30 are sequentially disposed from the top to the bottom in the perspective of FIGS. 1 and 2.

Specifically, the light shielding sheet 10 has a lower surface 11 and an upper surface 12, and the upper surface 12 faces the bottom of the button module (not shown). Moreover, the light shielding sheet 10 includes a plurality of light emitting portions 13 respectively corresponding to the respective keys of the key module (not shown). In this embodiment, the light guide plate 20 has a first opening 21 and a light emitting surface 22, and the light emitting surface 22 is disposed on the lower surface 11 of the light shielding sheet 10. The metal plate 30 has a second opening 31 and a reflecting surface 32. The metal plate 30 is located on the side of the light guide plate 20 with respect to the light exit surface 22, and the reflection surface 32 is disposed toward the light guide plate 20. Preferably, a colloid 50 is disposed on the periphery of the lower surface 11 of the light shielding sheet 10 such that the metal plate 30 and the light shielding film 10 are connected by the colloid 50, and the light guide plate 20 is located between the metal plate 30 and the light shielding film 10. Further, the reflecting surface 32 of the metal plate 30 is provided with a plurality of reflecting structures 321.

When the metal plate 30 is disposed on the side of the light guide plate 20 with respect to the light exit surface 22, the first opening 21 and the second opening 31 are correspondingly disposed to form a consistent hole, and the light emitting element 40 can be disposed in the through hole. In the present embodiment, the light-emitting element 40 is disposed on the circuit board 41. The circuit board 41 is disposed on the bottom surface of the metal plate 30. The light-emitting element 40 passes through the second opening 31 of the metal plate 30 and is received in the first opening 21. The inside of the through hole formed together with the second opening 31. The light emitted by the light-emitting element 40 can enter the light guide plate 20 from the side wall of the first opening 21 and be guided to the entirety of the light guide plate 20. unit The divided light is emitted toward the light-shielding sheet 10 through the light-emitting surface 22, and is emitted to the key cap of the button through the light-emitting portion 13 of the light-shielding sheet 10, thereby achieving the effect of the light-emitting of the button.

If the light in the light guide plate 20 is emitted downward to the metal plate 30, or the light emitted from the light-emitting element 40 is incident on the metal plate 30 from the second opening 31, the light can be reflected to the guide surface 32 by the reflective surface 32 of the metal plate 30. The light plate 20 is further utilized by the light guide plate 20. Therefore, the metal plate 30 can serve as a reflecting plate, and the reflecting effect of the reflecting surface 32 can be enhanced by the reflecting structure 321 .

In this embodiment, the material of the metal plate 30 may be aluminum, copper, or a combination thereof. Preferably, the reflective surface 32 is an aluminum layer and the reflective structure 321 is disposed on the aluminum layer. For example, the metal plate 30 may be an aluminum plate, and the surface (aluminum) of the metal plate 30 may directly serve as the reflecting surface 32. Alternatively, the metal plate 30 may be a copper plate, and a layer of aluminum may be plated on the surface of the copper plate to serve as the reflecting surface 32. In the present embodiment, a texture surface is formed on the reflective surface 32, as shown in FIG. 2, and the microstructure constituting the textured surface is the reflective structure 321 .

Preferably, the reflective structures 321 may be strip-shaped microstructures and arranged in parallel with each other on the reflective surface 32. For example, the surface of the hairline can be vapor-deposited on the reflective surface 32 by physical vapor deposition (PVD), as shown in FIG. 1, and each hairline (stripe microstructure) is The reflective structure 321 of the present embodiment. Generally, the reflectivity of a white plastic (PET) reflector at a wavelength of 450 nm is about 88%. After the surface of the hairline (reflective structure 321) was formed on the aluminum layer (reflecting surface 32), the reflectance of the metal plate 30 was also raised to 88%.

3 is a partially enlarged schematic view showing the second opening of the metal plate shown in FIG. 1, which is an enlarged schematic view of the area A shown in FIG. 1, which is shown in FIG. Preferably, the reflective structure 321 of the embodiment and one of the side walls 311 of the second opening 31 are parallel to each other, so that the reflective structure 321 can be separated from the main path of the light emitted by the light-emitting element 40 (the arrow symbol shown in FIG. 3). ) perpendicular to each other or parallel to each other. 3 is an example in which the reflective structure 321 and the side wall 311 are parallel to each other, and the reflective structure 321 and the main path of the light are perpendicular to each other. This structure allows the light to be more efficiently emitted toward the light guide plate 20 to lift the metal plate 30. Reflectivity. In other embodiments, the reflective structure 321 can also be parallel to the sidewall 312 (ie, the reflective structure 321 can be perpendicular to the sidewall 311), so that the reflective structure 321 and the main path of the light are parallel to each other, and the structure can also lift the metal plate. 30 reflectance.

Moreover, the circuit board 41 is disposed on the bottom surface of the metal plate 30, and the conductive property of the metal plate 30 can be utilized to achieve the effect of protecting against electrostatic discharge (ESD). 4 is a schematic view of the bottom surface of the metal plate shown in FIG. 1, which is shown in FIG. 4. Preferably, the metal plate 30 has a conductive region 33 and a non-conductive region 34 with respect to a surface of the reflective surface 32, that is, the bottom surface of the metal plate 30. Wherein, a part of the conductive area 33 is connected to the grounding element to achieve the effect of protecting against electrostatic discharge, thereby avoiding damage caused by the electrostatic discharge to the keyboard backlight module 1 or the illuminated keyboard as a whole.

The non-conductive region 34 of this embodiment is for achieving heat dissipation. A non-conductive layer, such as an ink, may be applied to the bottom surface portion of the metal plate 30. Specifically, depending on the configuration of the conductive region 33, the ink is printed in a manner that is not conductive. The area of region 33 is coated with a non-conductive layer to form a non-conductive region 34. The region where the non-conductive layer (ink) is not coated is the bottom surface of the metal plate 30 as the conductive region 33. Preferably, the non-conductive layer may be a black ink, which has high thermal conductivity and can be used for heat absorption to absorb heat radiation inside the keyboard backlight module 1, such as heat radiation emitted by the circuit board 41. Next, the heat radiation is conducted to the metal plate 30, and through the metal plate 30, the heat dissipation effect is assisted. Preferably, the thickness of the metal plate 30 can be between 0.02 mm (mm) and 0.1 mm for better heat dissipation.

In summary, the keyboard backlight module according to the present invention comprises a light shielding sheet, a light guiding plate and a metal plate. The light guide plate is disposed on the lower surface of the light shielding sheet, and the reflecting surface of the metal plate is disposed toward the light guide plate. The reflective surface of the metal plate reflects the light to the light guide plate and is used for total reflection, so that the metal plate can be directly used as a reflector to achieve a thinning effect. Moreover, the reflective surface is provided with a plurality of reflective structures, and the reflectivity of the reflective surface can be raised by the reflective structure to provide sufficient brightness. At the same time, the conductive properties of the metal plate can be utilized to achieve the protection effect of the electrostatic discharge.

In addition, a non-conductive layer may be coated on the bottom surface portion of the metal plate to form a non-conductive region, and a non-conductive layer may be a conductive region. In addition to the protective effect of the above-mentioned electrostatic discharge through the conductive region, the heat radiation inside the keyboard backlight module (for example, the heat radiation emitted by the circuit board) can be absorbed through the non-conductive region, and transmitted to the metal plate to achieve the heat dissipation effect. .

It should be noted that the various embodiments described above are exemplified for the convenience of the description, and the scope of the claims is intended to be limited by the scope of the claims.

Claims (9)

A keyboard backlight module includes: a light shielding sheet having a lower surface; a light guiding plate having a first opening and a light emitting surface, the light emitting surface being disposed on the lower surface of the light shielding sheet; and a metal plate having a a second opening and a reflecting surface, the first opening and the second opening are correspondingly disposed to form a consistent hole, the reflecting surface is disposed toward the light guide plate, and the reflecting surface is provided with a plurality of reflective structures, the metal plate is opposite to the reflective plate A surface of the reflective surface includes a conductive region and a non-conductive region; and a light emitting element is disposed in the through hole. The keyboard backlight module of claim 1, wherein the reflective surface is an aluminum layer, and the reflective structures are disposed on the aluminum layer. The keyboard backlight module of claim 1, wherein the material of the metal plate comprises aluminum, copper, or a combination thereof. The keyboard backlight module of claim 1, wherein the reflective structures are respectively a strip-shaped microstructure. The keyboard backlight module of claim 4, wherein the reflective structures are arranged in parallel with each other on the reflective surface. The keyboard backlight module of claim 5, wherein the reflective structures are parallel to one of the sidewalls of the second opening. The keyboard backlight module of claim 1, wherein a surface of the metal plate opposite to the reflective surface is coated with a non-conductive layer to form the non-conductive region, and the non-conductive layer is not coated. The area is the conductive area. The keyboard backlight module of claim 7, wherein the non-conductive layer has high thermal conductivity. The keyboard backlight module of claim 1, wherein a colloid is disposed on a periphery of the lower surface of the light shielding sheet, and the metal plate is connected to the light shielding sheet by the colloid.