TW202032060A - Keyboard backlight module - Google Patents

Abstract

The present invention discloses a keyboard backlight module, which includes a light-shielding film, a light guiding plate, a metallic plate and a light emitting member. The light-shielding film has a lower surface. The light guiding plate has a first opening and a light-emitting surface, the light-emitting surface is disposed on the lower surface of the light-shielding film. The metallic plate has a second opening and a reflecting surface. The first opening is disposed corresponding to second opening, so that to from a through hole. The reflecting surface is disposed toward the light guiding plate, and the reflecting surface has a plurality of reflective structures. The light emitting member is disposed in the through hole.

Description

Keyboard backlight module

The invention relates to a backlight module of a keyboard.

Nowadays, the rapid development of electronic technology and information industry has led to the trend of light, thin, short, small and powerful electronic devices. 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 occasions, users use input devices such as a mouse and a keyboard to operate the electronic device, and the keyboard is the most convenient to use.

In order to still be able to clearly see the symbols on each key in a low-light environment, some technicians introduced light source technology into the keyboard and developed a light-emitting keyboard with a backlight module. Currently, the luminous keyboard on the market is provided with a backlight module at the bottom of the key module. The backlight module includes a light guide plate, a reflective plate, and light-emitting elements. The light-emitting element is arranged on the light guide plate, so that the light can be guided to the bottom of the entire keyboard by the light guide plate, and the light is projected to the back of the keycap of each key. The light shines through the key surface or periphery of the key, so that the user can see the character symbols on the key cap clearly.

The main function of the reflector is to reflect light back to the light guide plate. Generally, the material of the reflector is a white plastic plate, such as polyethylene terephthalate (PET), which has no conductive effect. Therefore, some light-emitting keyboards add a metal plate to the bottom of the backlight module, or directly replace the reflective plate with a metal plate to prevent the keyboard from being damaged by electrostatic discharge (ESD). However, an 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 directly replacing the reflective plate with a metal plate is poor, and the luminous effect of the luminous keyboard is worsened and the brightness is lowered, and there is a need for improvement.

In view of the above-mentioned problems, the main purpose of the present invention is to provide a keyboard backlight module, which includes a metal plate with a reflective surface, and the reflective surface is provided with a plurality of reflective structures, so as to solve the problem of preventing electrostatic discharge from the conventional keyboard backlight module. Damage, and unable to achieve thinning and provide sufficient brightness at the same time.

To achieve the above objective, the present invention provides a keyboard backlight module, which includes a light-shielding sheet, a light guide plate, a metal plate, and a light-emitting element. The shading sheet has a lower surface. The light guide plate has a first opening and a light exit surface, and the light exit surface is arranged on the lower surface of the light shielding sheet. The metal plate has a second opening and a reflective surface. The first opening and the second opening are correspondingly arranged to form a through hole. The reflective surface is arranged toward the light guide plate, and the reflective surface is provided with a plurality of reflective structures. The light emitting element is arranged in the through hole.

According to an embodiment of the present invention, the reflective surface is an aluminum layer, and the reflective structures are arranged on the aluminum layer.

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

According to an embodiment of the present invention, the reflective structures are strip-shaped microstructures.

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

According to an embodiment of the present invention, the reflective structures and one of the side walls of the second opening are parallel to each other.

According to an embodiment of the present invention, a surface of the metal plate opposite to the reflective surface includes a conductive area and a non-conductive area.

According to an embodiment of the present invention, the surface of the metal plate opposite to the reflective surface is coated with a non-conductive layer to form a non-conductive area, and the area where the non-conductive layer is not coated is a conductive area.

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

According to an embodiment of the present invention, a glue is arranged on the periphery of the lower surface of the shading sheet, and the metal plate and the shading sheet are connected by the glue.

As mentioned above, the keyboard backlight module according to the present invention includes a light shield, a light guide plate and a metal plate. The light guide plate is arranged on the lower surface of the light shielding sheet, and the reflective surface of the metal plate is arranged toward the light guide plate. The reflective surface of the metal plate can reflect light to the light guide plate, and then is used for total reflection, so that the metal plate can be directly used as a reflective plate, which can achieve the effect of thinning. In addition, the reflective surface is provided with a plurality of reflective structures, and the reflectivity of the reflective surface can be improved by the reflective structure to provide sufficient brightness. At the same time, the conductive properties of the metal plate can be used to achieve the protective effect of electrostatic discharge.

In addition, a non-conductive layer can be coated on the bottom surface of the metal plate to form a non-conductive area, and the non-coated non-conductive layer is a conductive area. In addition to the aforementioned electrostatic discharge protection effect can be achieved through the conductive area, the thermal radiation inside the keyboard backlight module (such as the thermal radiation emitted by the circuit board) can be absorbed through the non-conductive area and conducted to the metal plate to achieve the effect of heat dissipation .

In order to allow your reviewer to better understand the technical content of the present invention, preferred specific embodiments are described as follows.

1 is an exploded schematic diagram of a keyboard backlight module according to an embodiment of the present invention. FIG. 2 is a partial cross-sectional schematic diagram of the keyboard backlight module shown in FIG. 1 after being assembled. Please refer to FIGS. 1 and 2 at the same time. 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. From the perspective of FIGS. 1 and 2, the light shielding sheet 10, the light guide plate 20, and the metal plate 30 are sequentially arranged from top to bottom.

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 key module (not shown). In addition, the light-shielding sheet 10 includes a plurality of light emitting parts 13, which can respectively correspond to the keys of the key module (not shown in the figure). In this embodiment, the light guide plate 20 has a first opening 21 and a light exit surface 22, and the light exit 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 reflective surface 32. The metal plate 30 is located on a side of the light guide plate 20 opposite to the light exit surface 22, so that the reflective surface 32 is disposed toward the light guide plate 20. Preferably, a glue 50 can be arranged on the periphery of the lower surface 11 of the light shielding sheet 10 so that the metal plate 30 and the light shielding sheet 10 are connected by the glue 50, and the light guide plate 20 is located between the metal plate 30 and the light shielding sheet 10. In addition, the reflective surface 32 of the metal plate 30 is provided with a plurality of reflective structures 321.

When the metal plate 30 is disposed on the side of the light guide plate 20 opposite to the light exit surface 22, the first opening 21 and the second opening 31 are correspondingly disposed to form a through hole, and the light emitting element 40 can be disposed in the through hole. In this embodiment, the light emitting element 40 is arranged on the circuit board 41, the circuit board 41 is arranged on the bottom surface of the metal plate 30, and the light emitting element 40 passes through the second opening 31 of the metal plate 30 and is accommodated in the first opening 21. In 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 entire light guide plate 20. Part of the light is emitted in the direction of the light-shielding sheet 10 through the light-emitting surface 22, and is emitted to the keycap of the key through the light-emitting portion 13 of the light-shielding sheet 10, thereby achieving the effect of light emission of the key.

If the light in the light guide plate 20 is emitted downward to the metal plate 30, or the light emitted by the light-emitting element 40 enters the metal plate 30 from the second opening 31, the light can be reflected to the metal plate 30 by the reflective surface 32 of the metal plate 30 The light plate 20 is then used by the light guide plate 20. Therefore, the metal plate 30 can be used as a reflective plate, and the reflective structure 321 can improve the reflective effect of the reflective surface 32.

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 can directly serve as the reflective surface 32. Alternatively, the metal plate 30 can be a copper plate, and a layer of aluminum can be plated on the surface of the copper plate to serve as the reflective surface 32. In this embodiment, a texture surface is formed on the reflective surface 32, as shown in FIG. 2, and the microstructure constituting the texture surface is the reflective structure 321.

Preferably, the reflective structures 321 may be strip-shaped microstructures, and are arranged on the reflective surface 32 in parallel to each other. For example, a physical vapor deposition (PVD) method may be used to vaporize the surface of the hairline pattern on the reflective surface 32, as shown in FIG. 1, and each hairline pattern (stripe microstructure) is This is the reflective structure 321 of this embodiment. Generally, the reflectivity of the white plastic (PET) reflector at the 450 nm band is about 88%. After testing, after the hairline pattern (reflective structure 321) is formed on the aluminum layer (reflective surface 32), the reflectance of the metal plate 30 can also be increased to 88%.

3 is a partially enlarged schematic diagram of the light emitting element shown in FIG. 1 being accommodated in the second opening of the metal plate, that is, an enlarged schematic diagram of the area A shown in FIG. 1, please refer to FIG. 3. Preferably, the reflective structure 321 of this 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 communicate with the main path of light emitted by the light-emitting element 40 (as shown in the arrow symbol in FIG. 3). ) Are mutually perpendicular or parallel to each other. FIG. 3 is an example of the reflection structure 321 and the side wall 311 being parallel to each other, so that the reflection structure 321 and the main path of the light are perpendicular to each other. This structure allows the light to be more effectively emitted in the direction of the light guide plate 20 to improve the metal plate 30 Reflectivity. In other embodiments, the reflective structure 321 and the sidewall 312 can be parallel to each other (that is, the reflective structure 321 can be perpendicular to the sidewall 311), so that the reflective structure 321 and the main path of light are parallel to each other. This structure can also enhance the metal plate 30's reflectivity.

In addition, the circuit board 41 is disposed on the bottom surface of the metal plate 30, and the conductive properties of the metal plate 30 can be further utilized to achieve the effect of preventing electrostatic discharge (ESD). FIG. 4 is a schematic diagram of the bottom surface of the metal plate shown in FIG. 1, please refer to FIG. 4. Preferably, a surface of the metal plate 30 opposite to the reflective surface 32, that is, the bottom surface of the metal plate 30, has a conductive area 33 and a non-conductive area 34. Among them, part of the conductive area 33 is connected to the grounding element to achieve the effect of preventing electrostatic discharge, thereby avoiding damage to the keyboard backlight module 1 or the entire light-emitting keyboard caused by the electrostatic discharge.

The non-conductive area 34 of this embodiment is used to achieve the effect of heat dissipation. A non-conductive layer may be coated on the bottom surface of the metal plate 30, such as ink. Specifically, according to the configuration of the conductive area 33, a non-conductive layer may be applied to the position of the non-conductive area 33 by ink printing to form the non-conductive area 34. The area where the non-conductive layer (ink) is not coated is the bottom surface of the metal plate 30 as the conductive area 33. Preferably, the non-conductive layer may be black ink, which has high thermal conductivity and can be used to absorb heat to absorb the thermal radiation inside the keyboard backlight module 1, such as the thermal radiation emitted by the circuit board 41. Then, the heat radiation is conducted to the metal plate 30, and the metal plate 30 assists in achieving the effect of heat dissipation. Preferably, the thickness of the metal plate 30 can be between 0.02 millimeters (mm) and 0.1 millimeters to achieve a better heat dissipation effect.

In summary, according to the keyboard backlight module of the present invention, it includes a light-shielding film, a light guide plate and a metal plate. The light guide plate is arranged on the lower surface of the light shielding sheet, and the reflective surface of the metal plate is arranged toward the light guide plate. The reflective surface of the metal plate can reflect light to the light guide plate, and then is used for total reflection, so that the metal plate can be directly used as a reflective plate, which can achieve the effect of thinning. In addition, the reflective surface is provided with a plurality of reflective structures, and the reflectivity of the reflective surface can be improved by the reflective structure to provide sufficient brightness. At the same time, the conductive properties of the metal plate can be used to achieve the protective effect of electrostatic discharge.

In addition, a non-conductive layer can be coated on the bottom surface of the metal plate to form a non-conductive area, and the non-coated non-conductive layer is a conductive area. In addition to the aforementioned electrostatic discharge protection effect can be achieved through the conductive area, the thermal radiation inside the keyboard backlight module (such as the thermal radiation emitted by the circuit board) can be absorbed through the non-conductive area and conducted to the metal plate to achieve the effect of heat dissipation .

It should be noted that many of the foregoing embodiments are given as examples for the convenience of description, and the scope of rights claimed in the present invention should be subject to the scope of the patent application, rather than limited to the foregoing embodiments.

1: Keyboard backlight module 10: Shading sheet 11: lower surface 12: upper surface 13: Light emitting department 20: Light guide plate 21: The first opening 22: Glossy surface 30: metal plate 31: second opening 311, 312: side wall 32: reflective surface 321: reflective structure 33: Conductive area 34: Non-conductive area 40: light-emitting element 41: circuit board 50: colloid A: area

FIG. 1 is an exploded schematic diagram of a keyboard backlight module according to an embodiment of the present invention. FIG. 2 is a schematic partial cross-sectional view of the keyboard backlight module shown in FIG. 1 after being assembled. 3 is a partially enlarged schematic view of the light emitting element shown in FIG. 1 being accommodated in a second opening of a metal plate. Fig. 4 is a schematic bottom view of the metal plate shown in Fig. 1.

1: Keyboard backlight module

10: Shading sheet

11: lower surface

12: upper surface

13: Light emitting department

20: Light guide plate

21: The first opening

22: Glossy surface

30: metal plate

31: second opening

32: reflective surface

321: reflective structure

40: light-emitting element

41: circuit board

50: colloid

A: area

Claims (10)

A keyboard backlight module includes: A shading sheet with a lower surface; A light guide plate having a first opening and a light-emitting surface, the light-emitting surface is disposed on the lower surface of the shading sheet; A metal plate having a second opening and a reflecting surface, the first opening and the second opening are correspondingly arranged to form a through hole, the reflecting surface is arranged toward the light guide plate, and the reflecting surface is provided with a plurality of reflecting structures ;as well as A light emitting element is arranged in the through hole. According to the keyboard backlight module described in the scope of patent application 1, the reflective surface is an aluminum layer, and the reflective structures are arranged on the aluminum layer. According to the keyboard backlight module described in item 1 of the scope of patent application, the material of the metal plate includes aluminum, copper, or a combination thereof. For the keyboard backlight module described in item 1 of the scope of patent application, the reflective structures are strip-shaped microstructures. According to the keyboard backlight module described in item 4 of the scope of patent application, the reflective structures are arranged parallel to each other on the reflective surface. According to the keyboard backlight module described in claim 5, the reflective structures and one of the side walls of the second opening are parallel to each other. According to the keyboard backlight module described in claim 1, wherein a surface of the metal plate opposite to the reflective surface includes a conductive area and a non-conductive area. The keyboard backlight module according to item 7 of the scope of patent application, wherein a non-conductive layer is coated on the surface portion of the metal plate opposite to the reflective surface to form the non-conductive area, and the non-conductive layer is not coated The area is the conductive area. According to the keyboard backlight module described in item 8 of the scope of patent application, the non-conductive layer has high thermal conductivity. The keyboard backlight module according to the first item of the scope of patent application, wherein a glue is arranged on the periphery of the lower surface of the shading sheet, and the metal plate and the shading sheet are connected by the glue.

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