TWM621328U - Backlight module - Google Patents

Abstract

A backlight module includes a light guide plate, a shading unit, a reflection unit, a circuit board, and several light-emitting parts. The light guide plate includes an opposite upper surface and a lower surface. The light-shielding unit includes a first sublayer coated and printed on the upper surface, and a second sublayer coated and printed on the first sublayer. The reflective unit includes a ring-shaped shielding layer coated and printed on the lower surface, and a reflective layer coated and printed under the shielding layer. The reflective layer, the shielding layer and the lower surface define a A reflective space. The light-emitting elements are disposed on the circuit board and pass through the reflective layer and extend into the reflective space. By using the method of coating and printing the light-shielding unit and the light-reflecting unit on the light guide plate, the overall thickness of the backlight module can be reduced, so as to achieve the purpose of lightening and thinning.

Description

Backlight Module

The new model relates to a backlight module, in particular to a backlight module for keyboards.

The existing backlight module includes a light guide plate, a plurality of light shielding sheets arranged on the upper surface of the light guide plate, a plurality of light reflectors arranged on the lower surface of the light guide plate, and a light emitting diode arranged on one side of the light guide plate. The shading sheets and the reflective sheets are usually stacked on the upper surface and the lower surface of the light guide plate with sheet-like materials to form a multi-layer board, so the existing backlight module has a certain thickness. However, under the trend of modern products pursuing light, thin and small designs, the existing backlight module is bulky and has a high manufacturing cost.

Therefore, the purpose of the present invention is to provide a backlight module with a thinner structure and lower manufacturing cost.

Therefore, the novel backlight module is suitable for being installed under a keyboard assembly, and the backlight module includes a light guide plate, a shading unit, a reflection unit, a circuit board, and several light-emitting elements. The light guide plate is located below the keyboard assembly and includes an upper surface and a lower surface opposite. The light-shielding unit includes a first sublayer that is coated and printed on the upper surface and can reflect light downward, and a first sublayer that is coated and printed on a side of the first sublayer opposite to the upper surface and can prevent light from penetrating. second sublayer. The reflective unit includes a ring-shaped shielding layer coated and printed on the lower surface and is annular and can prevent light leakage, and a coating and printed on a side of the shielding layer opposite to the lower surface and shielding the shielding layer and A reflective layer capable of reflecting light, the reflective layer, the annular shielding layer and the lower surface define a reflective space. The circuit board is arranged under the reflective layer. The light-emitting elements are disposed on the circuit board, pass through the reflective layer, and extend into the reflective space, and are used to generate light, so that the light is projected into the light guide plate and the reflective space.

The utility model has the following functions: by coating and printing the shading unit and the reflecting unit on the upper surface and the lower surface of the light guide plate respectively, the overall thickness of the backlight module can be greatly reduced to achieve the purpose of lightness and thinning.

Referring to FIGS. 1 , 2 and 3 , an embodiment of the novel backlight module 1 is suitable for being installed under a keyboard assembly 2 , and the backlight module 1 includes a light guide plate 3 , a shading unit 4 , a water The glue unit 5 , a reflection unit 6 , a circuit board 7 , and several light-emitting elements 8 .

The light guide plate 3 is located below the keyboard assembly 2 and includes an upper surface 31 and a lower surface 32 opposite to each other. In this embodiment, the light guide plate 3 is made of a light-transmitting material, such as light-transmitting polycarbonate (PC).

The light-shielding unit 4 includes a first sub-layer 41 which is coated and printed on the upper surface 31 with white ink and can reflect light downward, and a first sub-layer 41 which is coated and printed on the first sub-layer 41 with opaque black ink. The second sub-layer 42 on one side of the upper surface 31 can prevent light penetration. The first sub-layer 41 has a plurality of first light emitting regions 411 connected up and down, and the second sub-layer 42 has a plurality of second light emitting regions 421 which are respectively connected to the first light emitting regions 411 . The first light emitting areas 411 are areas that are not coated and printed with white ink, the second light emitting areas 421 are areas that are uncoated and printed with black ink, and the first light emitting areas 411 and the second light emitting areas 411 The area 421 is used for light to pass through and project upward to the keyboard assembly 2 .

The water glue unit 5 is coated on the second sub-layer 42 for combining the second sub-layer 42 with the keyboard assembly 2 .

The reflecting unit 6 includes an annular shielding layer 61 which is coated and printed on the lower surface 32 with opaque black ink and is annular to prevent light leakage, and a shielding layer 61 coated and printed on the shielding layer 61 with white ink. The reflective layer 62 is on one side of the lower surface 32 and shields the shielding layer 61 and can reflect light upward. The reflective layer 62 , the shielding layer 61 and the lower surface 32 define a reflective space 63 . The reflective layer 62 has a plurality of penetrating regions 621 respectively for the light-emitting elements 8 to pass through, so that the light-emitting elements 8 can project light into the light guide plate 3 and the reflection space 63 . The penetrating areas 621 are areas that are not coated and printed with white ink.

The circuit board 7 is disposed under the reflective layer 62 .

Referring to FIG. 1 , FIG. 2 and FIG. 4 , the light-emitting elements 8 are disposed on the circuit board 7 and respectively pass through the penetration regions 621 to extend into the reflection space 63 . In this embodiment, the light-emitting elements 8 are edge-lit LEDs.

The light-emitting elements 8 are electrically connected through the circuit board 7 to generate light, so that the light is projected laterally into the light guide plate 3 and the reflection space 63 . The first sub-layer 41 and the reflective layer 62 can reflect the light up and down, and then guide the light through the light guide plate 3, and the second sub-layer 42 and the annular shielding layer 61 can prevent the light from penetrating, so that the light can be transmitted. It is evenly distributed in the reflection space 63 and can be projected upward to the keyboard assembly 2 through the first light emitting areas 411 and the second light emitting areas 421 . It is worth mentioning that part of the light is not reflected by the first sub-layer 41 and penetrates the first sub-layer 41 , the second sub-layer 42 can block the light from penetrating, and the shielding layer 61 can prevent the light from being reflected leaks from the side in the path.

To sum up, in the backlight module 1 of the present invention, the first sublayer 41 of white ink and the first sublayer 41 of black ink are successively coated and printed on the upper surface 31 of the light guide plate 3 by coating and printing. Two sub-layers 42 are used to replace the existing light shielding sheets, and the ring-shaped shielding layer 61 and the reflective layer 62 of white ink are successively coated and printed with black ink on the lower surface 32 to replace the existing ones. As for the reflective sheet, compared with the existing backlight module, the overall thickness of the backlight module 1 of the present new type is greatly reduced to meet the requirements of light and thin, and can reduce the manufacturing cost, so it can indeed achieve the purpose of the new type.

However, the above are only examples of the present invention, which should not limit the scope of implementation of the present invention. Any simple equivalent changes and modifications made according to the scope of the patent application for this new model and the contents of the patent specification are still within the scope of the present invention. within the scope of this patent.

1: Backlight module 2: Keyboard components 3: light guide plate 31: Upper surface 32: Lower surface 4: Shading unit 41: The first sublayer 411: The first light-emitting area 42: Second sublayer 421: The second light-emitting area 5: Water glue unit 6: Reflective unit 61: Ring shield 62: Reflective layer 621: Penetration Zone 63: Reflection Space 7: circuit board 8: Lighting parts

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, wherein: 1 is an exploded perspective view of an embodiment of the novel backlight module; 2 is a schematic cross-sectional view of the embodiment and a keyboard assembly; 3 is a fragmentary perspective view of a circuit board of this embodiment; and FIG. 4 is an incomplete perspective combined view of the circuit board and a reflective layer of the embodiment.

1: Backlight module

2: Keyboard components

3: light guide plate

31: Upper surface

32: Lower surface

4: Shading unit

41: The first sublayer

42: Second sublayer

6: Reflective unit

61: Ring shield

62: Reflective layer

621: Penetration Zone

63: Reflection Space

7: circuit board

8: Lighting parts

Claims (5)

A backlight module suitable for being installed under a keyboard assembly, the backlight module comprising: a light guide plate, which is located below the keyboard assembly and includes an opposite upper surface and a lower surface; a light-shielding unit, comprising a first sub-layer coated and printed on the upper surface and capable of reflecting light downward, and a coating and printed on a side of the first sub-layer opposite to the upper surface and capable of preventing light from penetrating the second sublayer of ; a reflective unit, comprising a ring-shaped shielding layer coated and printed on the lower surface and can prevent light leakage, and a shielding layer coated and printed on a side of the shielding layer opposite to the lower surface and shielding the shielding layer a reflective layer capable of reflecting light, the reflective layer, the annular shielding layer and the lower surface define a reflective space; a circuit board disposed under the reflective layer; and A plurality of light-emitting elements are arranged on the circuit board, pass through the reflective layer and extend into the reflective space, and are used to generate light, so that the light is projected into the light guide plate and the reflective space. The backlight module of claim 1, wherein the first sublayer is coated and printed on the upper surface of the light guide plate with white ink, and the second sublayer is coated and printed on the first sublayer with black ink On the top, the shielding layer is coated and printed on the lower surface of the light guide plate with black ink and has a ring shape, and the reflective layer is coated and printed on a side of the shielding layer opposite to the lower surface with white ink. The backlight module according to claim 2, further comprising a water glue unit coated on the second sublayer to combine the second sublayer with the keyboard assembly. The backlight module of claim 3, wherein the reflective layer has a plurality of penetrating regions respectively for the light-emitting elements to pass through, so that the light-emitting elements can project light into the light guide plate and the reflection space . The backlight module of claim 4, wherein the first sub-layer has a plurality of first light-emitting areas connected up and down, and the second sub-layer has a plurality of second light-emitting areas that are respectively connected to the first light-emitting areas. The first light emitting areas and the second light emitting areas are used for light to pass through and project upward to the keyboard assembly.

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