TW202212935A - Backlight module - Google Patents

Abstract

A backlight module emits light toward a first direction and a second direction opposite to each other. The backlight module includes a light guiding component, a covering component, a base component and a light emitting component. The covering component is disposed on a top of the light guiding component in the first direction. The covering component defines first light penetrating regions respectively corresponding to keyswitches. The base component is disposed on a bottom of the light guiding component in the second direction. The base component defines a second light penetrating region. The light emitting component emits a beam into the light guiding component. A first part beam is transmitted into the light guiding component and passes through the first light penetrating regions toward the first direction, and a second part beam is transmitted into the light guiding component and passes through the second light penetrating region toward the second direction.

Description

Backlight Module

The present invention provides a backlight module, especially a backlight module that can emit light in multiple directions.

The light-emitting keyboard is equipped with a backlight module under the keyboard module. The light-emitting parts of the backlight module use the design of the light guide plate to guide the light to the keys of the keyboard, and illuminate the surrounding keys or the keycaps of the keys, so that they have decoration and instructions. Effect.

Generally speaking, the keyboard module has a plurality of keys disposed on the bottom plate, and a keyboard circuit board for triggering a signal when the keys are pressed is also disposed under the plural keys, and is disposed opposite to the bottom plate. Each key may at least include a keycap, a bracket connecting the keycap and the bottom plate, and an elastic member for providing a restoring force for the keycap. Usually, the backlight module is arranged under the key, and provides the light source and light guiding structure required for illuminating the keycap. The backlight module can be arranged under the bottom plate, and the bottom plate has light-transmitting holes for light to pass through; however, if necessary, the backlight module can also be arranged between the bottom plate and the keycap.

Regardless of the relative position of the backlight module and the bottom plate, the backlight module must guide the light to the corresponding area of each key, and illuminate each keycap upward.

The present invention provides a backlight module capable of emitting light in opposite directions to solve the above problems.

The scope of the patent application of the present invention is to disclose a backlight module that emits light in opposite first and second directions. The backlight module is adjacent to a plurality of keys along the first direction. The backlight module includes a light guide sheet, a cover sheet, a substrate sheet and a light-emitting element. The cover sheet is disposed on a top side of the light guide sheet along the first direction. The cover sheet defines a plurality of first light-transmitting regions. The plurality of first light-transmitting areas respectively correspond to the plurality of keys. The substrate sheet is disposed on a bottom side of the light guide sheet along the second direction. The substrate sheet defines at least one second light-transmitting area. The light-emitting element outputs an incident light into the light guide sheet, and after entering the light guide sheet, a first part of the incident light passes through the light guide sheet from the plurality of first light-transmitting regions of the cover sheet to the first direction During transmission, a second part of the incident light is transmitted from the second light-transmitting area of the substrate sheet to the second direction through the light guide sheet.

The scope of the patent application of the present invention further discloses a backlight module, which includes a light guide sheet, a substrate sheet, a cover sheet, a light-emitting element and a light guide. The light guide sheet has at least one first through hole. The base material sheet is arranged on one side of the light guide sheet. The substrate sheet has at least one second through hole corresponding to the first through hole. The cover sheet is disposed on the other side of the light guide sheet relative to the base sheet. The cover sheet has at least one third through hole corresponding to the first through hole. The light-emitting element corresponds to the first through hole, the second through hole and the third through hole. The light pipe is adjacent to the light-emitting element along a second direction. The light pipe has an opposite first end and a second end. The first end points to the light-emitting element, and the second end extends out of the substrate sheet.

The claimed scope of the present invention further discloses a backlight module, which is adjacent to a fan unit along a second direction. The backlight module and the fan unit are respectively disposed on opposite sides of a partition, and the partition has at least one first light-transmitting area. The backlight module includes a light source circuit board, a buffer sheet and a light-emitting element. The light source circuit board is disposed on the other side of the partition relative to the fan unit. The buffer sheet is arranged between the partition and the light source circuit board. The light-emitting element is disposed on the light source circuit board and corresponds to the first light-transmitting area of the partition element. An incident light output by the light-emitting element is irradiated to the fan unit in the second direction through the first light-transmitting area.

With the backlight module disclosed in the present invention, the illumination light of the backlight module in the keyboard can be guided and irradiated in multiple directions, which can be used for the illumination of adjacent components at different positions, without greatly increasing the overall thickness of the device. Below, provide multi-directional luminous indication or decorative function.

Please refer to FIGS. 1A, 1B and 2. FIG. 1A is a schematic diagram of the appearance of the computing device 1 and the keyboard 10 according to the first embodiment of the present invention, and FIG. 1B is a schematic top view of the keyboard 10 according to the first embodiment of the present invention. FIG. 2 is a schematic diagram of the keyboard 10 of FIG. 1A along the section line AA'. The computing device 1 is, for example, a notebook computer. The keyboard 10 is embedded in a casing 100 of the computing device 1 . The casing 100 has an upper casing 100A and a lower casing 100B that are vertically aligned. The keyboard 10 has a plurality of keys 12 . The keys 12 are arranged in a rectangular array, and each key 12 is partially exposed outside the upper casing 100A of the computing device 1 , and the bottom side of the keyboard 10 corresponds to the lower casing 100B. A backlight module 16 is disposed between the lower part of the keyboard 10 and the lower casing 100B. The computing device 1 can set the fan unit 14 in the casing 100 , for example, between the bottom side of the keyboard 10 and the lower casing 100B. In each embodiment of the present invention, the backlight module 16 shared by the keyboard 10 can be used to provide illumination for components located in different directions around the backlight module 16 (eg, the keys 12 and the fan unit 14 ). The key 12 can be composed of a key cap 18 , a reset member 20 , a support member 22 , a thin film circuit board 24 and a bottom plate 25 . In different embodiments, the stacking order of the thin film circuit board 24 and the backplane 25 may be interchanged.

Please refer to FIGS. 1A/1B and FIGS. 2 to 3. FIG. 3 is a schematic diagram of the backlight module 16A according to the first embodiment of the present invention. The backlight module 16A can emit light toward the opposite first direction D1 and second direction D2. The backlight module 16A may be adjacent to the key 12 along the first direction D1. The backlight module 16A may include a light guide sheet 26 , a cover sheet 28 , a substrate sheet 30 and one or more light emitting elements 32 . The cover sheet 28 may be disposed on the top side of the light guide sheet 26 along the first direction D1, and the substrate sheet 30 may be disposed on the bottom side of the light guide sheet 26 along the second direction D2. The light-emitting element 32 can be arranged beside the light guide sheet 26, or penetrate through the hole of the light guide plate 26; usually the light-emitting element 32 is located on the light source circuit board (not shown), and the light source circuit board is attached to the lower surface of the substrate sheet 30 or Cover the upper surface of the sheet 28 so that the light-emitting element 32 extends from above or below the light guide sheet 26 into the hole (such as the opening 262 in FIG. 2 ) or the side of the light guide sheet 26 . The light-emitting element 32 can be arranged on one side of the overall keyboard 10, for example, in FIG. 1B, a plurality of light-emitting elements 32 are arranged along the long side of the keyboard 10, and are close to the plurality of keys 12 on the outermost long side; in different embodiments Among them, the plurality of light-emitting elements 32 can also be arranged approximately parallel to the short side of the keyboard 10 and arranged in the central section of the keyboard 10 . Each light emitting element 32 is disposed on one side of the light guide sheet 26 or in the opening 262 of the light guide sheet 26 , so that the incident light B output by the light emitting element 32 enters the light guide sheet 26 .

The cover sheet 28 defines one or more first light-transmitting regions 282 . The cover sheet 28 of the present invention can be coated on the upper surface and/or the lower surface of the transparent substrate to define the first light-transmitting area 282; or the cover sheet 28 can be an opaque substrate, and the first light-transmitting area 282 can be defined by cutting holes. Light-transmitting area 282 . In this embodiment, the first cover layer 281 can be used to define a plurality of first light-transmitting regions 282 on the inner surface or the outer surface of the transparent substrate. For example, the first cover layer 281 may include an opaque ink layer (eg, black ink) and/or a reflective ink layer (eg, white ink), which is disposed outside the first light-transmitting area 282 of the cover sheet 28, to reflect the incident light B; in other words, the first cover layer 281 will not set the opaque ink layer or the reflective ink layer in the first light transmission area 282 , and the incident light B can be irradiated to the keys through the first light transmission area 282 12.

The substrate sheet 30 defines one or more second light-transmitting regions 302 . The substrate sheet 30 of the present invention can be defined by coating on the upper surface and/or the lower surface of the transparent substrate; or the substrate sheet 30 can be an opaque substrate, and the second light-transmitting area 302 is defined by cutting holes . In this embodiment, the second cover layer 301 can be used to define a plurality of second light-transmitting regions 302 on the inner surface or the outer surface of the transparent substrate. For example, the second cover layer 301 may include a light-shielding ink layer (eg, black ink) and/or a reflective ink layer (eg, white ink), which are disposed outside the second light-transmitting area 302 of the substrate sheet 30 , which means that The second cover layer 301 does not provide a light-shielding ink layer or a light-reflecting ink layer in the second light-transmitting area 302 ; and the position of the second light-transmitting area 302 may correspond to the fan unit 14 .

The light in the light guide sheet 26 is mostly transmitted along the plane of the light guide sheet 26 and inside the light guide sheet 26 in a total reflection manner, so that the light can be transmitted to the keys at each corner of the keyboard 10 far from the light-emitting element 32 in FIG. 1B . 12. In order to allow enough light to pass through the first light-transmitting area 282, the light guide sheet 26 may have a plurality of groups of reflective structures 261 to destroy total reflection. 261 can be formed of reflective ink micro-dot clusters, micro-dimple patterns or micro-projection structures arranged on the surface of the light guide sheet 26 . After the incident light B of the light-emitting element 32 enters the light guide sheet 26 , the first part of the light B1 of the incident light B can be transmitted to the first direction D1 through the light-reflecting structure 261 of the light guide sheet 26 , and is transmitted from the first transparent portion of the cover sheet 28 . The light area 282 penetrates out, thereby illuminating the key 12; the second part of the light B2 of the incident light B can be transmitted to the second direction D2 through the reflective structure 261 of the light guide sheet 26, from the second light transmission area 302 of the substrate sheet 30 pass out, thereby illuminating the fan unit 14 .

As shown in FIGS. 2 and 3, the backlight module 16A can be adjacent to the fan unit 14 along the second direction D2, so the position of the second light-transmitting area 302 can correspond to the fan unit 14 to form a decorative pattern. Please refer to FIG. 3 and FIG. 14. FIG. 14 is a schematic view of the appearance of the substrate sheet 30 according to the first embodiment of the present invention. The first embodiment illustrates that the substrate sheet 30 can be provided with a second light-transmitting area 302 , so that the second part of the light B2 of the incident light B of the light-emitting element 32 is transmitted through the second light-transmitting area 302 to the substrate sheet 30 to illuminate the fan unit 14 . . The position, shape and size of the second light-transmitting area 302 can correspond to the position, shape and size of the fan unit 14 , and the light guide sheet 26 is also provided with the light-reflecting structure 261 according to the shape and size distribution of the second light-transmitting area 302 . At the same time, a light-transmitting hole 101 may also be provided on the lower casing 100B to allow the light passing through the fan unit 14 to pass through. In other words, the shape and size layout of the second light-transmitting area 302 of the substrate sheet 30 and the light-transmitting hole 101 of the lower case 100B, or one of them, can define the backlight module 16/16A in the second direction D2 (ie, lighting and decorative effects on one side of the fan unit 14). Of course, in some embodiments, the reflective structure 261 may also be directly disposed on the top side of the light guide sheet 26 to directly guide the second part of the light B2 to the second direction D2.

As mentioned above, in the first embodiment, the cover sheet 28 and/or the first light-transmitting area 282 thereof can be made of a solid transparent material, and the substrate sheet 30 and/or the second light-transmitting area 302 thereof are also made of solid transparent material. material production, but the practical application is not limited to this.

Please refer to FIG. 4 , which is a schematic diagram of a backlight module 16B according to a second embodiment of the present invention. In the second embodiment, the elements with the same element names or element numbers as in the first embodiment have the same structures and functions, and the description is not repeated here. The cover sheet 28 of the backlight module 16B may form a single or a plurality of first through holes as the first light-transmitting regions 282 . In addition, one or more second through holes may be formed on the substrate sheet 30 to serve as the second light-transmitting regions 302 .

Please refer to FIGS. 3 to 5. FIG. 5 is a schematic diagram of a backlight module 16C according to a third embodiment of the present invention. In the third embodiment, the elements with the same element names or element numbers in other embodiments of the present invention have the same structure and function, and the description is not repeated here. The second cover layer 301 (ie the light-shielding ink layer and/or the reflective ink layer) of the first embodiment and the second embodiment is disposed on the bottom side of the substrate sheet 30 away from the light guide sheet 26 . The second cover layer 301 of the third embodiment can be disposed on the top side of the base material sheet 30 adjacent to the light guide sheet 26 , for example, between the light guide sheet 26 and the base sheet 30 .

In the first to third embodiments, that is, the light-emitting element 32 in FIGS. 1A to 5 , in addition to providing the first part of the incident light that is transmitted along the first direction D1 (irradiating the key 12 ), it also provides the first part of the incident light. Two parts of the light are transmitted along the second direction D2 (irradiating the fan unit 14 ). However, considering the sufficiency of light quantity and specific optical effects, the light-emitting element in the embodiment of the present invention can also use an additional second light source (for example, the following light-emitting element 40/ 48/58/68) provides the second part of the light, irradiating in the second direction D2. The light emitting element 32 serving as the first light source and the light emitting elements 40/48/58/68 serving as the second light source can be implemented by a plurality of different light emitting diodes on the same light source circuit board or on different light source circuit boards. In the following embodiments, the light emitting element includes a first light source and a second light source, wherein the light emitting element 32 serving as the first light source is omitted, and only the light emitting element 40/48/58/68 serving as the second light source will be described.

Please refer to FIG. 1A , FIG. 2 and FIG. 6 . FIG. 6 is a schematic diagram of a backlight module 16D according to a fourth embodiment of the present invention. In the fourth embodiment, the elements having the same element names or element numbers as other embodiments of the present invention have the same structure and function, and the description is not repeated here. The light guide sheet 34 of the backlight module 16D is disposed between the cover sheet 36 and the base sheet 38 . The cover sheet 36 may have a plurality of first light-transmitting regions 361 , and the substrate sheet 38 may have second light-transmitting regions 381 . In this embodiment, the light emitting element 32 serving as the first light source and providing the first part of the light to transmit/irradiate the key 12 along the first direction D1 is omitted and not shown, and the light emitting element 40 serving as the second light source can be installed on the light guide sheet 34 The hole 341 and the mounting hole 382 of the substrate sheet 38 are inside. In the fourth embodiment, the cover sheet 36 may have a plurality of protruding parts 362 , each protruding part 362 protruding in the first direction D1 in an arch shape and recessed in the second direction D2 , and covering the corresponding light-emitting element 40 . The light guide sheet 34 may have a plurality of holes 342 , and the periphery of each protruding portion 362 has one or more bending segments 362 a bent downwardly inserted into the corresponding holes 342 to reflect the second part of the light B2 and project it to the second light transmission area 381.

The first cover layer of the cover sheet 36 may include a reflective ink layer coated on the lower surface and/or the upper surface of the plurality of protrusions 362 . The light-emitting element 40 can output the incident light B along the first direction D1, the incident light B can be projected to the cover sheet 36 through the light guide sheet 34, and then passed through the second light-transmitting area 381 through the reflection of the reflective ink layer to the second light-transmitting area 381. Send in direction D2. The inner surface of the protruding portion 362 can reflect the incident light B projected toward the left and right sides of the light emitting element 40 in the second direction D2, so as to increase the light intensity passing through the second light-transmitting area 381 along the second direction D2. The second light-transmitting region 381 in the fourth embodiment is made of a solid transparent material, but the practical application is not limited to this.

Please refer to FIG. 7 , which is a schematic diagram of a backlight module 16E according to a fifth embodiment of the present invention. In the fifth embodiment, the elements with the same element names or element numbers in other embodiments of the present invention have the same structure and function, and the description is not repeated here. The backlight module 16E is provided with perforations in the substrate sheet 38 as the second light-transmitting area 381 .

Furthermore, in the fourth embodiment and the fifth embodiment, a light-shielding ink layer and/or a light-reflecting ink layer may be further provided on the substrate sheet 38 . The light-shielding ink layer can be used to prevent the incident light B from penetrating out of the range other than the second light-transmitting area 381 of the substrate sheet 38 . The reflective ink layer can be used to reflect the incident light B projected to the range outside the second light-transmitting area 381 of the substrate sheet 38 back to the cover sheet 36, and then reflected by the reflective ink layer of the cover sheet 36 to pass through the second transparent area. light area 381, thereby increasing the intensity of light passing through the second light transmission area 381 along the second direction D2.

Please refer to FIGS. 8 and 9, which are schematic diagrams of the backlight module 16F at different viewing angles according to the sixth embodiment of the present invention. In the sixth embodiment, the elements with the same element names or element numbers in other embodiments of the present invention have the same structure and function, and the description is not repeated here. The light guide sheet 42 of the backlight module 16F may be disposed between the cover sheet 44 and the base sheet 46 . The light guide 42 may have a U-shaped cutout 421 for defining the light guide fins 422 . The light incident section 422 a of the light guide fin 422 can be aligned with the light emitting element 48 , and the light exit section 422 b of the light guide fin 422 can be partially exposed to the bottom side 423 of the light guide 42 . The second part of the light B2 of the incident light B output by the light-emitting element 48 (first light source) will be irradiated in the second direction D2 through the light guide fins 422 , and the first light source irradiating the key 12 in the first direction D1 is omitted and not shown.

The backlight module 16F can optionally include a pressing member 50 for pressing against the light guide fins 422 so as to incline the light guide fins 422 at a specific angle along the second direction D2, which means bending the light guide fins 422 of the light guide sheet 42 to let out light The section 422b may be partially exposed to the bottom side 423 of the light guide sheet 42 . Furthermore, the cover sheet 44 can be selectively cut to form the cover sheet 441 , and the formation position of the cover sheet 441 can correspond to the position of the light guide sheet 422 . The cover fin 441 can cover the light guide fin 422 of the light guide 42. At this time, the abutting member 50 abuts the upper surface of the cover fin 441, and the abutting light guide fin 422 is inclined to the second direction D2. The abutting member 50 is located between the bottom side of the key 12 (the bottom plate 25 ) and the cover flap 441 .

Please refer to FIG. 10. FIG. 10 is a schematic diagram of a backlight module 16G according to a seventh embodiment of the present invention. In the seventh embodiment, the elements with the same element names or element numbers in other embodiments of the present invention have the same structure and function, and the description is not repeated here. The backlight module 16G may include a light guide sheet 52 , a substrate sheet 54 , a cover sheet 56 , a first light source (not shown), one or more light emitting elements 58 (second light source), and one or more light pipes 60 . The substrate sheet 54 and the cover sheet 56 may be disposed on two opposite sides of the light guide sheet 52, respectively. The light guide sheet 52 may have a first through hole 521 , the substrate sheet 54 may have a second through hole 541 , and the cover sheet 56 may have a third through hole 561 . The positions of the first through hole 521 , the second through hole 541 and the third through hole 561 may correspond to each other. The light emitting element 58 may be disposed on the light source circuit board 62 , and its position may correspond to the first through hole 521 , the second through hole 541 and the third through hole 561 . The bottom plate 25 of the key 12 may have holes 221 corresponding to the first through holes 521, the second through holes 541 and the third through holes 561. The light-emitting element 58 disposed on the light source circuit board 62 can pass through the holes 221 and enter the holes 221, 561 and 561. A channel formed by the through hole 521 , the second through hole 541 and the third through hole 561 enables the extending direction of the light-emitting element 58 and the aforementioned channel to be aligned with the long axis direction of the light pipe 60 . There may be a partition 11 between the fan unit 14 and the backlight module G. In order to make the light guide 60 extend into the fan unit 14 and project the incident light B to the fan unit 14 through the light guide 60, the partition 11 and the fan housing 143 can be separated from each other. Holes are provided to accommodate the light guide 60 correspondingly. If necessary, the light-emitting element 58 and the light source circuit board 62 may not be fixed on the bottom plate 25, but are directly disposed on the surface of the cover sheet 56 (the side adjacent to the key 12), that is, the light-emitting element 58 and the light source circuit board 62 are disposed on the surface of the cover sheet 56 (the side adjacent to the button 12). Between the cover sheet 56 and the bottom plate 25, in short, the light-emitting element 58 (the second light source) penetrates into the first through hole 521 of the light guide sheet 52 along the second direction D2, while the other light-emitting element (the first light source) remains. The key 12 is illuminated with light through the light guide sheet 52 toward the first direction D1. In this embodiment, the first light source (not shown) and the second light source (light emitting element 58) can be located on the lower surface of the light source circuit board 62 at the same time (with the direction of the key 12 or the first direction D1 as the upper direction).

The light pipe 60 is adjacent to the light emitting element 58 along the second direction D2 and may have opposite first ends 601 and second ends 602 . The first end 601 can be directed to the light-emitting element 58 , and the second end 602 can extend out of the substrate sheet 54 of the backlight module 16G and extend into the fan unit 14 . Therefore, the incident light B output from the light-emitting element 58 enters the light pipe 60 from the first end 601 , and is projected from the second end 602 by the total internal reflection of the light pipe 60 . In the seventh embodiment, the second end 602 of the light guide 60 can extend between the fan blade 141 of the fan unit 14 and the motor 142 to provide lighting and decorative effects. The light guide 60 can be fixed on the fan casing 143 of the fan unit 14 or the fan circuit board 144, and the installation position thereof depends on the design requirements.

Please refer to FIG. 11, which is a schematic diagram of a backlight module 16H according to an eighth embodiment of the present invention. In the eighth embodiment, the elements with the same element names or element numbers in the other embodiments of the present invention have the same structure and function, and the description is not repeated here. The backlight module 16H is adjacent to the fan unit 14 with a partition 64 therebetween to separate the two. The backlight module 16H may include a light source circuit board 66 , a first light source (not shown), a light emitting element 68 (a second light source), a buffer sheet 70 (if necessary), and a light pipe 72 . The spacer 64 may have a first light-transmitting area 641 . The light source circuit board 66 and the fan unit 14 are respectively disposed on opposite sides of the partition member 64 . The buffer sheet 70 may be disposed between the partition member 64 and the light source circuit board 66 to provide a high accommodation space for the protruding light-emitting element 68 ; in addition, the buffer sheet 70 may have a second light-transmitting area 701 for the light-emitting element 68 to penetrate. The light-emitting element 68 may be disposed on the light source circuit board 66 , and its position corresponds to the first light-transmitting area 641 of the spacer 64 and the second light-transmitting area 701 of the buffer sheet 70 . The light pipe 72 may be disposed between the lighting member 68 and the fan unit 14 . The buffer sheet 70 can also use the light guide sheet 26/34 (the first light guide sheet) in the previous embodiment, so that the buffer sheet 70 can be used as the second light guide sheet to provide the function of lateral transmission of light, and use the light guide sheet of the previous embodiment. The reflective structure 261, the cover sheet 28/36/44/56, the substrate sheet 30/38/46/54, or directly coated on the buffer sheet 70 with reflective ink or opaque ink, etc., direct the light toward the second direction D2 guide.

The position of the light pipe 72 may correspond to the first light-transmitting area 641 of the spacer 64 and the second light-transmitting area 701 of the buffer sheet 70 . The light pipe 72 may have opposing first ends 721 and second ends 722 . The first end 721 may point toward the light-emitting element 68 , and the second end 722 may extend into the interior of the fan unit 14 . The incident light B output from the light-emitting element 68 enters the light guide 72 through the first end 721 , and is projected from the second end 722 by the total internal reflection of the light guide 72 to illuminate the fan unit 14 to provide lighting and decorative effects. The light guide 72 can be fixed on the fan housing 143 of the fan unit 14 or the fan circuit board 144, and the installation position thereof depends on design requirements. The first light-transmitting area 641 and the second light-transmitting area 701 may be through holes for the light-emitting element 68 and the light pipe 72 to penetrate.

Please refer to FIG. 12, which is a schematic diagram of a backlight module 16I according to a ninth embodiment of the present invention. In the ninth embodiment, the elements having the same element names or element numbers as other embodiments of the present invention have the same structure and function, and the description will not be repeated here. The backlight module 16I may include a light source circuit board 66 , a light-emitting element 68 and a buffer sheet 70 . The light-emitting element 68 may be disposed on the light source circuit board 66 . The light source circuit board 66 may be disposed on the side of the partition member 64 opposite to the fan unit 14 . The spacer 64 may have a first light-transmitting region 641 , such as a through hole or a solid light-transmitting material, located adjacent to the light-emitting element 68 . The spacer 64 may also have a bend region 642 for partially shielding the light emitting element 68 . The buffer sheet 70 may be disposed between the spacer 64 and the light source circuit board 66 . The second light-transmitting region 701 of the buffer sheet 70 may be a raised structure for covering the light-emitting element 68 . As in the previous embodiment, the buffer sheet 70 can also use the light guide sheet 26/34 (the first light guide sheet) in the previous embodiment, so that the buffer sheet 70 can be used as the second light guide sheet to provide the function of lateral transmission of light, and Using the reflective structure 261, the cover sheet 28/36/44/56, the substrate sheet 30/38/46/54 of the previous embodiment, or directly coating the buffer sheet 70 with reflective ink or opaque ink, etc. Guided in the second direction D2. The entire buffer sheet 70 may have light penetration or light transmission properties, or only the second light transmission area 701 may have light penetration or light transmission properties.

The light source circuit board 66 may have a reflective ink coating located adjacent to the light-emitting element 68 for reflecting the incident light B output by the light-emitting element 68 to project toward the first light-transmitting area 641 or the second direction D2. The incident light B of the light-emitting element 68 can pass through the second light-transmitting area 701 and be projected to the fan unit 14 through the first light-transmitting area 641 . The reflection of the reflective ink coating 72 can increase the light intensity projected to the fan unit 14, providing lighting and decorative effects.

Please refer to FIG. 13, which is a schematic diagram of a backlight module 16J according to a tenth embodiment of the present invention. In the tenth embodiment, the elements having the same element names or element numbers as other embodiments of the present invention have the same structure and function, and the description is not repeated here. The difference between the tenth embodiment and the ninth embodiment is mainly that the bending area 642 of the partition 64 of the backlight module 16J is used to completely shield the light-emitting member 68 , and the backlight module 16J further includes guides cut out from the buffer sheet 70 . The light blade 74 and the abutting member 76 . The open end of the light guide fin 74 corresponds to the second light transmission area 701 of the buffer sheet 70 . One end of the light guide fin 74 is directed towards the light-emitting member 68 , and the open end of the light guide fin 74 is bent to point to the first light-transmitting area 641 or to the second direction D2 due to the abutment of the abutting member 76 . The incident light B output from the light-emitting element 68 can be projected to the fan unit 14 through the internal total reflection of the light guide fins 74 , which means that the backlight module 16J uses the bending of the light guide fins 74 to change the light transmission direction of the incident light B.

In addition, the backlight module 16J may further include a reflective material 78 disposed on the light-emitting element 68 . If the reflective material 78 provides a light recovery function, it can reflect the incident light B of the light-emitting element 68 back to the light-guiding fins 74 to increase the intensity of the illuminating light to improve the lighting and decorative effects. The buffer sheet 70 of the tenth embodiment can be made of light-guiding material, and the light-guiding fins 74 can be buffer fins formed by partially cutting the buffer sheet 70; Sheet 74 may be an additionally mounted separate element. The corresponding structural relationship between the buffer sheet 70 and the light guide fins 74 is not limited to the previously disclosed embodiment, but depends on design requirements.

It should be added that the backlight modules 16G/16H/16I in Figures 11/12/13 may not include the first light source (and its light guide sheet/cover sheet/substrate sheet/reflective structure/ink, etc.) The lighting in the first direction D1 is provided for the lighting of the fan unit 14 alone.

Please refer to FIGS. 15 and 16. FIG. 15 is a schematic view of the bottom side of the computing device 2 and the protective cover 200 according to the eleventh embodiment of the present invention, and FIG. 16 is the keyboard 10A and the protective cover 200 of FIG. Sectional view of part of the structure connected to B'. In the eleventh embodiment, the elements with the same element names or element numbers in other embodiments of the present invention have the same structure and function, and the description is not repeated here. The multi-directional light-emitting backlight module 16K of the present invention can be applied to tablet computers and protective cover keyboards. In FIG. 15 , the keyboard 10A is embedded between the upper casing 200A and the lower casing 200B of the protective cover 200 , and the plurality of keys 12 are exposed outside the upper casing 200A as shown in FIG. 1A . The backlight module 16K is arranged between the lower part of the keyboard 10A and the lower casing 200B, that is, the backlight module 16K is arranged between the plurality of keys 12 (or the keyboard 10A) and the protective cover 200 (the lower casing 200B), or the backlight module 16K It is adjacent to the protective cover 200 (the lower case 200B) in the second direction D2. The computing device 2 (such as a tablet computer) is accommodated on the side of the extension housing 200C of the protective cover 200 , and the extension housing 200C can also be fixed to the outer shell of the computing device 2 itself only through magnetism, without covering and accommodating the computing device 2 . The protective cover 200 can define the light-transmitting portion 201 on the lower casing 200B, for example, a single or multiple light-transmitting structure is formed by hollowing out or thinning, as the light-transmitting portion 201 in the second direction D2, and the light-transmitting portion 201 The position corresponds to the second light-transmitting area 302 of the substrate sheet 30 to form a light-emitting decorative pattern. The design position of the light-transmitting portion 201 ie/or the second light-transmitting region 302 may not be limited to the above-described embodiment, and either or one of the two or one may be defined as a brand logo, a function indication (such as an incoming call/mail/power) pattern, etc. According to actual needs.

With the backlight module disclosed in the present invention, the illumination light of the backlight module in the keyboard can be guided and irradiated to different directions, and used for the illumination of adjacent components at different positions, without greatly increasing the overall thickness of the device. , to achieve the decoration or indication function of double-sided backlight. The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.

1, 2: computing device 10, 10A: keyboard 100: Shell 200: protective case 100A/200A: Upper case 100B/200B: Lower case 200C: Extended Housing 101: light-transmitting hole 201: Light penetration part 11: Dividers 110: Separation hole 12: Button 14: Fan unit 141: Fan blade 142: Motor 143: Fan Housing 144: Fan circuit board 16/16A/16B/16C/16D/16E/16F16G/16H/16I/16J/16K: Backlight Module 18: keycap 20: reset piece 22: Supports 221: Hole 24: Thin film circuit board 25: Bottom plate 26: Light guide sheet 261: Reflective Structure 262: Opening 28: Cover Sheet 281: First Overlay 282: The first light transmission area 30: substrate sheet 301: Second overlay 302: The second light transmission area 32: Lighting pieces 34: light guide sheet 341: Mounting holes 342: Hole 36: Cover Sheet 361: The first light transmission area 362: Protrusion 362a: Bend segment 38: substrate sheet 381: The second light transmission area 382: Mounting holes 40: Lighting pieces 42: light guide sheet 421: U-grooving 422: Light guide fins 422a: Light entrance section 422b: Light exit section 423: Bottom Side 44: Cover Sheet 441: Covering flaps 46: substrate sheet 48: Lighting Pieces 50: Abutment pieces 52: light guide sheet 521: First Piercing 54: substrate sheet 541: Second Perforation 56: Cover Sheet 561: Third Piercing 58: Lighting Pieces 60: Light pipe 601: First End 602: Second End 62: circuit board 64: Dividers 641: The first light transmission area 642: Bending Zone 66: Light source circuit board 68: Lighting Pieces 70: Buffer 701: Second light transmission area 72: Light Pipe 721: First End 722: Second End 74: Light guide sheet 76: Abutment pieces 78: Reflective material B: Incident light B1: The first part of the light B2: The second part of the light D1: first direction D2: Second direction

FIG. 1A is a schematic diagram of the appearance of the computing device and the keyboard according to the first embodiment of the present invention. FIG. 1B is a schematic top view of the keyboard according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of a partial structure of the keyboard of FIG. 1A . FIG. 3 is a schematic diagram of the backlight module according to the first embodiment of the present invention. FIG. 4 is a schematic diagram of a backlight module according to a second embodiment of the present invention. FIG. 5 is a schematic diagram of a backlight module according to a third embodiment of the present invention. FIG. 6 is a schematic diagram of a backlight module according to a fourth embodiment of the present invention. FIG. 7 is a schematic diagram of a backlight module according to a fifth embodiment of the present invention. FIG. 8 and FIG. 9 are schematic diagrams of the backlight module of the sixth embodiment of the present invention at different viewing angles. FIG. 10 is a schematic diagram of a backlight module according to a seventh embodiment of the present invention. FIG. 11 is a schematic diagram of a backlight module according to an eighth embodiment of the present invention. FIG. 12 is a schematic diagram of a backlight module according to a ninth embodiment of the present invention. FIG. 13 is a schematic diagram of a backlight module according to a tenth embodiment of the present invention. FIG. 14 is a schematic view of the appearance of the substrate sheet according to the first embodiment of the present invention. FIG. 15 is a schematic view of the bottom side appearance of the computing device and the protective cover according to the eleventh embodiment of the present invention. FIG. 16 is a partial cross-sectional view of the keyboard of FIG. 15 .

10: Keyboard

100: Shell

100A: Upper shell

100B: Lower shell

101: light-transmitting hole

12: Button

14: Fan unit

16: Backlight module

18: keycap

20: reset piece

22: Supports

24: Thin film circuit board

25: Bottom plate

262: Opening

32: Lighting pieces

D1: first direction

D2: Second direction

Claims (18)

A backlight module, which emits light toward an opposite first direction and a second direction, the backlight module is adjacent to a plurality of keys along the first direction, and the backlight module comprises: a light guide; a cover sheet, arranged on a top side of the light guide sheet along the first direction, the cover sheet defines a plurality of first light-transmitting areas, and the plurality of first light-transmitting areas respectively correspond to the plurality of keys; a substrate sheet disposed on a bottom side of the light guide sheet along the second direction, the substrate sheet defining at least a second light-transmitting area; and a light-emitting element, which outputs an incident light and enters the light guide sheet. After entering the light guide sheet, a first part of the incident light passes through the light guide sheet from the plurality of first light-transmitting regions of the cover sheet to the first light-transmitting area. direction transmission, a second part of the incident light is transmitted from the second light-transmitting area of the substrate sheet to the second direction through the light guide sheet. The backlight module of claim 1, wherein the cover sheet has at least a first cover layer to define the first light-transmitting area, and the first cover layer includes a light-tight ink layer and/or a reflective ink layer, The first cover layer does not include the opaque ink layer or the reflective ink layer in the first transparent region. The backlight module of claim 1, wherein the substrate sheet has at least a second cover layer to define the second light-transmitting area, the second cover layer includes a light-shielding ink layer and/or a reflective ink layer, the The second cover layer does not include the light-shielding ink layer or the reflective ink layer in the second light-transmitting area. The backlight module of claim 1, wherein the light guide sheet has a plurality of groups of light-reflecting structures disposed on a bottom surface or a top surface of the light guide sheet to reflect the first part of the light or the second part of the light toward the Irradiate in the first direction or the second direction. The backlight module of claim 1, wherein the light guide sheet has a hole, the cover sheet has a protrusion, and the protrusion has a bent section inserted into the hole, so that one of the protrusions is inserted into the hole. The surface reflects the second part of the light and projects toward the second light-transmitting area. The backlight module of claim 5, wherein the first cover layer comprises a reflective ink layer, which is respectively coated on the plurality of protruding portions. The backlight module of claim 1, wherein the backlight module is adjacent to a protective cover along the second direction, and the protective cover has at least one light penetrating portion, and the light penetrating portion corresponds to the substrate sheet the second transparent area. The backlight module of claim 1, wherein the backlight module is adjacent to a fan unit along the second direction, and the second light-transmitting area corresponds to the fan unit. The backlight module of claim 1, wherein the light guide sheet comprises a U-shaped cutout to define a light guide fin, and at least a portion of a light exit section of the light guide fin is exposed to the light guide sheet a bottom side, so that the second part of the light is partially irradiated in the second direction. The backlight module of claim 9, wherein an abutting member abuts against the light guide fin and is inclined at an angle toward the second direction, so that at least a part of the light exit section of the light guide fin is exposed to the light guide. the bottom side of the light sheet. The backlight module of claim 10, wherein the cover sheet has a cover sheet, the light guide sheet covered on the light guide sheet, the abutting member abuts against the cover sheet, and also pushes against the guide sheet The light fins are inclined toward the second direction. A backlight module, comprising: a light guide sheet with at least one first through hole; a substrate sheet disposed on one side of the light guide sheet, the substrate sheet has at least one second through hole corresponding to the first through hole; a cover sheet, disposed on the other side of the light guide sheet relative to the base material sheet, the cover sheet has at least one third perforation corresponding to the first perforation; a light-emitting element corresponding to the first through hole, the second through hole and the third through hole; and A light pipe, adjacent to the light-emitting element along a second direction, has a first end and a second end opposite to the light-emitting element, the first end points to the light-emitting element, and the second end protrudes from the substrate sheet. The backlight module of claim 12, wherein the backlight module is adjacent to a plurality of keys along a first direction, the light-emitting element includes a first light source and a second light source, and the first light source transmits the light guide The sheet illuminates the plurality of keys toward the first direction, and the second light source penetrates the first through hole of the light guide sheet along the second direction. The backlight module of claim 12, wherein the backlight module is disposed adjacent to a fan unit along the second direction, and the second end of the light pipe is located in the fan unit. A backlight module is adjacent to a fan unit along a second direction, the backlight module and the fan unit are respectively arranged on opposite sides of a partition, the partition has at least a first light-transmitting area, the backlight module is The group contains: a light source circuit board disposed on the other side of the partition relative to the fan unit; a buffer sheet disposed between the partition and the light source circuit board; and a light-emitting element disposed on the light source circuit board and corresponding to the first light-transmitting area of the partition, an incident light output from the light-emitting element passes through the first light-transmitting area and irradiates the fan toward the second direction unit. The backlight module of claim 15, wherein the backlight module further comprises a light pipe having a first end and a second end opposite to each other, the first end points to the light-emitting element, and the second end extends into the fan unit. The backlight module of claim 15, wherein the buffer sheet has at least one raised structure to cover the light-emitting element. The backlight module as claimed in claim 15, wherein the backlight module further comprises an abutting member and a light guide fin on the buffer sheet, one end of the light guide fin points to the light-emitting member, and the abutting member tops The open end of the anti-bending light guide fin points to the second direction.

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