TWM629934U - Backlight Module - Google Patents

Abstract

A backlight module is suitable for being installed under a keyboard assembly, and includes a circuit board, several light-emitting parts, and a thin film layer. The light-emitting elements are arranged on the circuit board. The thin film layer is located between the keyboard assembly and the circuit board, and includes a main layer body disposed above the circuit board, and a plurality of light guide portions formed on the main layer body and covering the light-emitting elements respectively. The light guide portion is used for diffusing the light generated by the corresponding light-emitting element outward in a direction away from the light-emitting element. The light-emitting parts are respectively covered by the light-guiding parts, and the light generated by the light-emitting parts is diffused outward in a direction away from the light-emitting parts, so as to reduce the brightness directly above each light-emitting part and increase the overall light-emitting area, achieve uniform brightness.

Description

Backlight Module

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

With the advancement and development of science and technology, various electronic devices have a variety of innovative research and development. Taking a keyboard as an example, in order to allow users to use it even in a low-light environment, a light-emitting keyboard with a backlight module has been developed in recent years. The light-emitting keyboard with a backlight module includes a circuit board, a plurality of backlight modules arranged on the circuit board, and a plurality of keycaps arranged on the circuit board corresponding to the backlight modules. The characters on the top surface of the keycaps can transmit light to allow the light emitted by the backlight module to penetrate, so that the user can recognize the characters on the keycaps and operate smoothly even in a low-light environment.

However, a general backlight module usually has a plurality of light-emitting diodes which are correspondingly disposed directly under the keycaps. The characters on the top surface of the keycap are partially bright and the rest are dim. This situation will make the characters difficult to read, causing a poor user experience and affecting product sales.

Therefore, the purpose of the present invention is to provide a backlight module capable of uniform brightness.

Therefore, the novel backlight module is suitable for being installed under a keyboard assembly, and includes a circuit board, a plurality of light-emitting elements, and a thin film layer. The light-emitting elements are arranged on the circuit board. The thin film layer is located between the keyboard assembly and the circuit board, and includes a main layer body disposed above the circuit board, and a plurality of light guide portions formed on the main layer body and covering the light-emitting elements respectively. The light guide portion is used for diffusing the light generated by the corresponding light-emitting element outward in a direction away from the light-emitting element.

The effect of the present invention lies in that the light-guiding parts cover the light-emitting elements respectively, and the light generated by the light-emitting elements is diffused outward in a direction away from the light-emitting element, so as to reduce the brightness directly above each light-emitting element, and Increase the overall light-emitting area to achieve uniform brightness.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are designated by the same reference numerals.

Referring to FIG. 1 to FIG. 3 , a first embodiment of the novel backlight module 1 is suitable for being installed under a keyboard assembly 10 . The keyboard assembly 10 has several keycaps 11 (only one is shown in FIG. 2 ). The backlight module 1 includes a circuit board 2 , a plurality of light-emitting elements 3 , and a thin film layer 4 .

The light-emitting elements 3 are arranged on the circuit board 2 at intervals, and each four light-emitting elements 3 are correspondingly disposed under one of the keycaps 11 in a group. In this embodiment, the light-emitting elements 3 are light-emitting diodes (LEDs). The advantage of such a design is that it is easy to control with signals and can generate white light, monochromatic light, or mixed light of other colors ( e.g. using RGB color mode).

The film layer 4 is located between the keyboard assembly 10 and the circuit board 2 , and includes a main layer body 41 disposed on the upper surface of the circuit board 2 , and a plurality of layers formed on the main layer body 41 and covering the lights respectively. The light guide portion 42 of the component 3 is provided. The light guide portions 42 are convexly disposed on the main layer body 41 in a convex spherical shape, and cooperate with the circuit board 2 to define an accommodating space 43 for accommodating the corresponding light-emitting element 3 .

When each light-emitting element 3 emits light, it travels along a path similar to that shown by the arrow in FIG. 3 . Specifically, the light generated by each light-emitting element 3 is reflected multiple times by the light-guiding portion 42 and the circuit board 2 in the accommodating space 43 , and then refracted and penetrated through the side of the light-guiding portion 42 . The light is diffused outward in the direction away from the light-emitting element 3 . Therefore, the light emitted by the light-emitting elements 3 will bounce back and forth in the accommodating space 43 repeatedly and be evenly distributed until it is transmitted through the light-guiding portion 42 , which can reduce the amount of light directly above each light-emitting element 3 . Brightness, and increase the overall light-emitting area to achieve uniform brightness.

In this embodiment, the film layer 4 is a transparent film. In one variation of this embodiment, the film layer 4 is made of a white film, and each light guide portion 42 is provided with four perforations (not shown) arranged at the periphery to facilitate light penetration go out. In another variation of this embodiment, the film layer 4 is a transparent film, and white ink (not shown) is printed on the top of the upper surface of each light guide portion 42 to facilitate the reflection of light.

4 and 5, a second embodiment of the novel backlight module 1 is similar to the first embodiment, and the main difference is:

The light guide portions 42 are not convex spherical. Each light guide portion 42 has a bump 44 protruding from the top surface of the main layer body 41 and located above the corresponding light-emitting element 3 , and a light extending downward from the top surface of the bump 44 toward the corresponding light-emitting element 3 . The adjustment surface 45 and an accommodating space 43 for accommodating the corresponding light-emitting element 3 are defined by the cooperation of the main layer body 41 and the circuit board 2 . The light adjusting surface 45 of each light guide portion 42 surrounds a conical groove.

When each light-emitting element 3 emits light, it travels along a path similar to that shown by the arrow in FIG. 5 , the light is refracted by the accommodating space 43 and enters the bump 44 , and is reflected by the light adjusting surface 45 and refracted into the accommodating space 43 . , then reflected by the circuit board 2 , and finally refracted and penetrated through the main layer body 41 , so that the light radiates outward in the direction away from the light-emitting element 3 , so as to reduce the brightness directly above each light-emitting element 3 and increase the The overall light-emitting area achieves uniform brightness.

6 and 7, a third embodiment of the novel backlight module 1 is similar to the second embodiment, and the main differences are:

The light adjusting surface 45 of each light guide portion 42 does not surround the conical groove, but surrounds the arc groove.

When each light-emitting element 3 emits light, it travels along a path similar to that shown by the arrow in FIG. 7 , the light is refracted from the accommodating space 43 into the bump 44 , and then refracted through the light-adjusting surface 45 to move away from the light-emitting element 3 . The direction of the light radiates outward to reduce the brightness directly above each light-emitting element 3 and increase the overall light-emitting area to achieve uniform brightness.

8 and 9, a fourth embodiment of the novel backlight module 1 is similar to the first embodiment, and the main difference is:

The backlight module 1 further includes a light guide plate 5 disposed between the circuit board 2 and the thin film layer 4 , and a white ink layer 6 coated on the lower surface of the thin film layer 4 . The light guide plate 5 has a plurality of through holes 51 corresponding to the light emitting elements 3 and the light guide portions 42 respectively. The light-emitting elements 3 are respectively located in the through holes 51 . Each light guide portion 42 of the thin film layer 4 has a light adjusting surface 45 extending downward from the bottom surface of the main layer body 41 toward the corresponding light emitting element 3 and located in the corresponding through hole 51 . The light adjusting surface 45 has a conical shape around it. The light adjusting surface 45 of each light guide portion 42 cooperates with the corresponding through hole 51 and the circuit board 2 to define an accommodating space 43 .

When each light-emitting element 3 emits light, it travels along a path similar to that shown by the arrow in FIG. 9 . The light is reflected in the accommodating space 43 by the white ink layer 6 coated on the light-adjusting surface 45 , and then transmitted by the circuit. The plate 2 is reflected, and finally refracted and penetrated through the main layer body 41, so that the light radiates outward in the direction away from the light-emitting element 3, so as to reduce the brightness directly above each light-emitting element 3 and increase the overall light-emitting area, achieve uniform brightness.

To sum up, the backlight module 1 of the present invention is provided with the thin film layer 4 and passes through the structure of the light guide portions 42, so that the light generated by the light emitting elements 3 radiates outward in a direction away from itself, In order to reduce the brightness directly above each light-emitting element 3, and increase the overall light-emitting area to achieve uniform brightness, the purpose of the present invention can indeed be achieved.

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 10: Keyboard Components 11: Keycaps 2: circuit board 3: Lighting parts 4: film layer 41: Main layer body 42: Light guide part 43: accommodating space 44: bump 45: Light adjustment surface 5: Light guide plate 51: Perforation 6: White ink layer

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 a first embodiment of the backlight module of the present invention; 2 is a combined cross-sectional view of the first embodiment and a keyboard assembly; Fig. 3 is a partial enlarged cross-sectional view of the first embodiment; 4 is a perspective exploded view of a second embodiment of the novel backlight module; Fig. 5 is a partial enlarged cross-sectional view of the second embodiment; 6 is a perspective exploded view of a third embodiment of the novel backlight module; Fig. 7 is a partial enlarged cross-sectional view of the third embodiment; 8 is a perspective exploded view of a fourth embodiment of the novel backlight module; and FIG. 9 is an enlarged partial cross-sectional view of the fourth embodiment.

1: Backlight module

2: circuit board

3: Lighting parts

4: film layer

41: Main layer body

42: Light guide part

43: accommodating space

Claims (8)

A backlight module suitable for being installed under a keyboard assembly, the backlight module comprising: a circuit board; a plurality of light-emitting elements disposed on the circuit board; and A thin film layer is located between the keyboard assembly and the circuit board, and includes a main layer body disposed above the circuit board, and a plurality of light guide portions formed on the main layer body and covering the light-emitting elements respectively, The light guide portion is used for diffusing the light generated by the corresponding light-emitting element outward in a direction away from the light-emitting element. The backlight module as claimed in claim 1, wherein the light guide portions are convexly disposed on the main layer body in a convex spherical shape and cooperate with the circuit board to define an accommodating space for accommodating the corresponding light-emitting element. The backlight module of claim 1, wherein each light guide portion has a bump protruding from the top surface of the main layer body and located above the corresponding light-emitting element, and a bump from the top surface of the bump toward the corresponding The light-adjusting surface of the light-emitting element extends downward, and an accommodating space for accommodating the corresponding light-emitting element is defined by the cooperation of the main layer body and the circuit board. The backlight module of claim 3, wherein the light adjusting surface of each light guide portion surrounds the conical groove. The backlight module of claim 3, wherein the light adjusting surface of each light guide portion surrounds a circular arc-shaped groove. The backlight module of claim 1, further comprising a light guide plate disposed between the circuit board and the thin film layer, the light guide plate having a plurality of perforations corresponding to the light-emitting elements and the light-guiding parts, respectively, The light-emitting elements are respectively located in the through holes, and each light-guiding portion of the film layer has a light-adjusting surface extending downward from the bottom surface of the main layer body toward the corresponding light-emitting element and located in the corresponding through-holes. The backlight module of claim 6, further comprising a white ink layer coated on a surface of the thin film layer adjacent to the light guide plate. The backlight module of claim 6, wherein the light adjustment surface of each light guide portion is conical in shape.

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