TWI731797B - 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 light to the keys of the keyboard, illuminate the keys around the 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 arranged on the bottom plate, and the keyboard circuit board for triggering signals when the keys are pressed is also arranged under the plurality of keys, and is arranged opposite to the bottom plate. Each key may at least include a key cap, a bracket connecting the key cap and the bottom plate, and an elastic member that provides the key cap restoring force. Generally, the backlight module is arranged under the keys to provide the light source and light guiding structure required to illuminate the keycaps. 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 key cap.

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 key cap upward.

The present invention provides a backlight module that can emit light in opposite directions to solve the above-mentioned problems.

The patent application scope of the present invention discloses 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 arranged on a top side of the light guide sheet along the first direction. The cover sheet defines a plurality of first light transmission areas. The plurality of first light-transmitting areas respectively correspond to a plurality of keys. The substrate sheet is arranged 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 areas of the cover sheet to the first direction Transmitting, 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 patent application scope 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 pipe. The light guide sheet has at least one first perforation. The substrate sheet is arranged on one side of the light guide sheet. The substrate sheet has at least one second perforation corresponding to the first perforation. The cover sheet is arranged on the other side of the light guide sheet opposite to the base sheet. The cover sheet has at least one third perforation corresponding to the first perforation. The light-emitting element corresponds to the first perforation, the second perforation and the third perforation. The light pipe is adjacent to the light-emitting element along a second direction. The light pipe has 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 out of the substrate sheet.

The patent application scope of the present invention also discloses a backlight module which 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, 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 arranged 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 arranged on the light source circuit board and corresponds to the first light-transmitting area of the partition. An incident light output by the light-emitting element illuminates the fan unit in the second direction through the first light-transmitting area.

With the backlight module disclosed in the present invention, the illuminating light of the backlight module in the keyboard can be guided and irradiated in multiple directions, which can be used as the illumination of adjacent components in different positions without greatly increasing the overall thickness of the device. Under, provide multi-directional light-emitting instructions or decorative functions.

Please refer to Figures 1A, 1B and Figure 2. Figure 1A is a schematic diagram of the appearance of the computing device 1 and the keyboard 10 of the first embodiment of the present invention, and Figure 1B is a schematic top view of the keyboard 10 of the first embodiment of the present invention. FIG. 2 is a schematic diagram of the keyboard 10 in FIG. 1A along the section line AA'. The computing device 1 is, for example, a notebook computer. The keyboard 10 is embedded in the housing 100 of the computing device 1. The housing 100 has an upper housing 100A and a lower housing 100B that are aligned up and down. 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 housing 100A of the computing device 1, and the bottom side of the keyboard 10 corresponds to the lower housing 100B. A backlight module 16 is arranged under the keyboard 10 and between the lower casing 100B. The computing device 1 can be provided with a fan unit 14 in the housing 100, for example, between the bottom side of the keyboard 10 and the lower housing 100B. In various embodiments of the present invention, the shared backlight module 16 in the keyboard 10 can be used to illuminate the components (such as the buttons 12 and the fan unit 14) located in different directions around the backlight module 16. The button 12 can be composed of a keycap 18, a reset member 20, a support member 22, a film circuit board 24, and a bottom plate 25. In different embodiments, the thin film circuit board 24 and the bottom plate 25 can be interchanged in stacking order.

Please refer to FIGS. 1A/1B, FIGS. 2 to 3, and 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 in opposite first and second directions D1 and D2. The backlight module 16A may be adjacent to the button 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 base 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 into 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 The upper surface of the cover sheet 28 allows the light emitting element 32 to extend into the hole (such as the opening 262 in FIG. 2) or the side of the light guide sheet 26 from above or below the light guide sheet 26. The light-emitting element 32 can be arranged on one side of the integral keyboard 10, for example, in Figure 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 row of long sides; in different embodiments In this case, a 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 arranged on one side of the light-guiding sheet 26, or arranged in the opening 262 of the light-guiding sheet 26, so that the incident light B output by the light-emitting element 32 enters the light-guiding sheet 26.

The cover sheet 28 defines one or more first light-transmitting areas 282. The cover sheet 28 of the present invention may use a coating 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 may be an opaque substrate with cut holes to define the first light-transmitting area. Transparent area 282. In this embodiment, the first covering 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 (for example, black ink) and/or a reflective ink layer (for example, white ink), which is arranged in a range outside the first light transmission area 282 of the cover sheet 28, with To reflect the incident light B; in other words, the first covering layer 281 does not place the opaque ink layer or the reflective ink layer in the first light-transmitting area 282, and the incident light B can be irradiated to the button through the first light-transmitting 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 using a coating on the upper surface and/or the lower surface of the transparent substrate; or the substrate sheet 30 can be an opaque substrate with cut holes to define the second light-transmitting area 302 . In this embodiment, the second covering 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 covering layer 301 may include a light-shielding ink layer (for example, black ink) and/or a light-reflecting ink layer (for example, white ink), and is disposed in a range outside the second light-transmitting area 302 of the substrate sheet 30, which means The second covering layer 301 does not dispose the light-shielding ink layer or the 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 way of total reflection, so that the light can be transmitted to the keys in each corner of the keyboard 10 far away from the light emitting element 32 in Figure 1B. 12. In order to allow enough light to pass through the first light-transmitting area 282, the light guide sheet 26 may have multiple groups of light reflecting structures 261 to destroy total reflection. The light reflecting structures 261 are arranged on the bottom surface of the light guide sheet 26 (the side opposite to the light emitting side). 261 can be formed by a cluster of reflective ink micro-dots, a micro-cavity pattern, or a micro-projection structure 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 plate 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 plate 26, from the first transmission of the cover sheet 28 The light area 282 passes through to illuminate the button 12; the second part of the light B2 of the incident light B can be transmitted to the second direction D2 through the light-reflecting structure 261 of the light guide sheet 26, from the second light-transmitting 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 diagram 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 the 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 passes through the second light-transmitting area 302 to pass through 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 will also be provided with light-reflecting structures 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 housing 100B to allow 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 housing 100B, or one of them, can define the backlight module 16/16A in the second direction D2 (ie One side of the fan unit 14) lighting and decorative effects. Of course, in some embodiments, the light reflecting structure 261 can also be directly arranged 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 described above, in the first embodiment, the cover sheet 28 and/or its first light-transmitting area 282 can be made of a solid transparent material, and the substrate sheet 30 and/or its second light-transmitting area 302 can also be made of a solid transparent material. Material production, but the actual application is not limited to this.

Please refer to FIG. 4, which is a schematic diagram of the backlight module 16B according to the second embodiment of the present invention. In the second embodiment, the components with the same component names or component numbers as in the first embodiment have the same structure and function, and the description will not be repeated here. The cover sheet 28 of the backlight module 16B can form a single or a plurality of first perforations to serve as the first light-transmitting area 282. In addition, the substrate sheet 30 may be formed with one or more second perforations to serve as the second light-transmitting area 302.

Please refer to FIG. 3 to FIG. 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, components with the same component names or component numbers as those of other embodiments of the present invention have the same structure and function, and the description will not be repeated here. The second covering layer 301 (that is, the light-shielding ink layer and/or the light-reflecting 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 covering layer 301 of the third embodiment can be disposed on the top side of the base 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 Figures 1A to 5, in addition to providing the first part of the incident light to pass along the first direction D1 (illuminating the button 12), it also provides the first part of the incident light at the same time. The two parts of light are transmitted along the second direction D2 (illuminating the fan unit 14). However, considering whether the amount of light is sufficient and the specific optical effect, in addition to the above-mentioned light-emitting element 32 (as the first light source), the light-emitting element of the embodiment of the present invention may also adopt an additional second light source (such as the following light-emitting element 40/ 48/58/68) Provide a second part of light, irradiating in the second direction D2. The light-emitting element 32 as the first light source and the light-emitting element 40/48/58/68 as the second light source can be realized by using multiple 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, and the light-emitting element 32 as the first light source is omitted and will not be repeated, and only the light-emitting element 40/48/58/68 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, components with the same component names or component 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 areas 361, and the base sheet 38 may have a second light-transmitting area 381. In this embodiment, as the first light source, the light-emitting element 32 that provides the first part of light to transmit/illuminate the button 12 in the first direction D1 is omitted and not shown, and the light-emitting element 40 as the second light source can be installed on the light guide plate 34. The hole 341 and the mounting hole 382 of the base sheet 38 are inside. In the fourth embodiment, the cover sheet 36 may have a plurality of protrusions 362, each protrusion 362 protrudes in the first direction D1 in an arch shape and is recessed in the second direction D2, and covers the corresponding light emitting element 40. The light guide plate 34 may have a plurality of holes 342, and the periphery of each protrusion 362 has one or more bending sections 362a bent downward to be inserted into the corresponding holes 342 to reflect the second part of the light B2 to the second light transmission area 381.

The first covering layer of the covering sheet 36 may include a reflective ink layer, which is coated on the lower surface and/or the upper surface of the plurality of protrusions 362. The light-emitting element 40 can output 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 pass through the second light-transmitting area 381 through the reflection of the reflective ink layer, and go to the second light-transmitting area 381. Transfer in direction D2. The inner surface of the protrusion 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 intensity of the light passing through the second light transmission area 381 along the second direction D2. The second light-transmitting area 381 of the fourth embodiment is made of a solid transparent material, but the actual 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, components with the same component names or component 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 16E is provided with perforations in the substrate sheet 38 to serve 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 from the area outside 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 area outside the second light-transmitting area 381 of the substrate sheet 38 back to the cover sheet 36, and then reflect by the reflective ink layer of the cover sheet 36 to pass through the second light-transmitting area. The 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 FIG. 8 and FIG. 9. FIG. 8 and FIG. 9 are schematic diagrams of the backlight module 16F in different viewing angles according to the sixth embodiment of the present invention. In the sixth embodiment, components with the same component names or component numbers as those of other embodiments of the present invention have the same structure and function, and the description will not be 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 sheet 42 may have a U-shaped cut 421 for defining the light guide fin 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 (the first light source) is irradiated in the second direction D2 through the light guide fin 422, and the first light source irradiating the button 12 in the first direction D1 is omitted and not shown.

The backlight module 16F may optionally include an abutting member 50 for resisting the light guide fin 422 so that it is inclined at a specific angle along the second direction D2, which means that the light guide fin 422 of the light guide 42 is bent to let out the light. The cross 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 fin 441, and the formation position of the cover fin 441 can correspond to the position of the light guide fin 422. The covering fin 441 can cover the light guiding fin 422 of the light guiding sheet 42. At this time, the abutting member 50 is pressed against the upper surface of the covering fin 441, and the abutting light guiding fin 422 is inclined in the second direction D2. The top abutment 50 is located between the bottom side of the button 12 (bottom plate 25) and the covering flap 441.

Please refer to FIG. 10, which is a schematic diagram of a backlight module 16G according to a seventh embodiment of the present invention. In the seventh embodiment, components with the same component names or component numbers as those of other embodiments of the present invention have the same structure and function, and the description will not be 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 sources), and one or more light pipes 60. The base sheet 54 and the cover sheet 56 may be respectively arranged on two opposite sides of the light guide sheet 52. The light guide sheet 52 may have a first perforation 521, the base sheet 54 may have a second perforation 541, and the cover sheet 56 may have a third perforation 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 can be disposed on the light source circuit board 62, and its position can correspond to the first through hole 521, the second through hole 541, and the third through hole 561. The bottom plate 25 of the button 12 may have a hole 221 corresponding to the first hole 521, the second hole 541, and the third hole 561. The light emitting element 58 provided on the light source circuit board 62 can pass through the hole 221 and enter the hole 221, A channel formed by a through hole 521, a second through hole 541, and a third through hole 561 enables the light emitting element 58 and the aforementioned channel to extend in the direction of the long axis of the light pipe 60. There may be a partition 11 between the fan unit 14 and the backlight module G. In order to extend the light pipe 60 into the fan unit 14 and project the incident light B to the fan unit 14 through the light pipe 60, the partition 11 and the fan housing 143 can be separated Holes are provided to accommodate the light pipe 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 arranged on the surface of the cover sheet 56 (near the side of the button 12), that is, the light-emitting element 58 and the light source circuit board 62 are arranged on the Between the cover sheet 56 and the bottom plate 25, in short, the light-emitting element 58 (the second light source) penetrates the first perforation 521 of the light guide sheet 52 along the second direction D2, and the other light-emitting element (the first light source) is still The button 12 is provided with light through the light guide plate 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 button 12 direction or the first direction D1 being the upper side).

The light pipe 60 is adjacent to the light emitting element 58 along the second direction D2, and may have a first end 601 and a second end 602 opposite to each other. The first end 601 can point 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 out 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 pipe 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 pipe 60 can be fixed to the fan housing 143 or the fan circuit board 144 of the fan unit 14, and the position of the light pipe 60 depends on the design requirements.

Please refer to FIG. 11. FIG. 11 is a schematic diagram of a backlight module 16H according to an eighth embodiment of the present invention. In the eighth embodiment, components with the same component names or component numbers as 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 separating 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 partition 64 may have a first light-transmitting area 641. The light source circuit board 66 and the fan unit 14 are respectively arranged on opposite sides of the partition 64. The buffer sheet 70 may be disposed between the partition 64 and the light source circuit board 66 to fill the accommodating space for the protruding light-emitting member 68; in addition, the buffer sheet 70 may have a second light-transmitting area 701 for the light-emitting member 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 partition 64 and the second light-transmitting area 701 of the buffer sheet 70. The light pipe 72 may be disposed between the light emitting member 68 and the fan unit 14. The buffer sheet 70 can also use the light guide sheet 26/34 (first light guide sheet) in the foregoing embodiment, so that the buffer sheet 70 can be used as a second light guide sheet to provide the light lateral transmission function, and use the light guide sheet of the foregoing embodiment Reflective structure 261, cover sheet 28/36/44/56, base sheet 30/38/46/54, or directly coated with reflective ink or opaque ink on the buffer sheet 70 to direct the light in the second direction D2 guide.

The position of the light pipe 72 may correspond to the first light transmission area 641 of the partition 64 and the second light transmission area 701 of the buffer sheet 70. The light pipe 72 may have a first end 721 and a second end 722 opposite to each other. The first end 721 can point to the light emitting element 68, and the second end 722 can extend into the inside of the fan unit 14. The incident light B output by the light emitting element 68 can enter the light pipe 72 through the first end 721, and then project from the second end 722 by the total internal reflection of the light pipe 72 to illuminate the fan unit 14 to provide lighting and decorative effects. The light pipe 72 can be fixed to the fan housing 143 or the fan circuit board 144 of the fan unit 14, and the position of the light pipe 72 depends on the design requirements. The first light-transmitting area 641 and the second light-transmitting area 701 may be penetrating 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, components with the same component names or component 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 provided on the light source circuit board 66. The light source circuit board 66 can be arranged on the side of the partition 64 opposite to the fan unit 14. The partition 64 may have a first light-transmitting area 641, such as a through hole or a solid light-transmitting material, which is located adjacent to the light-emitting element 68. The partition 64 may also have a bending area 642 for partially shielding the light emitting element 68. The buffer sheet 70 may be disposed between the partition 64 and the light source circuit board 66. The second light-transmitting area 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 (first light guide sheet) in the previous embodiment, so that the buffer sheet 70 can be used as a second light guide sheet to provide the light lateral transmission function, and Using the reflective structure 261, cover sheet 28/36/44/56, base sheet 30/38/46/54 of the foregoing embodiment, or directly coating the buffer sheet 70 with reflective ink or opaque ink, the light Guide in the second direction D2. The buffer sheet 70 may have light penetration or light transmission characteristics as a whole, or only the second light transmission area 701 may have light penetration or light transmission characteristics.

The light source circuit board 66 may have a reflective ink coating, which is located adjacent to the light-emitting element 68 to reflect the incident light B output by the light-emitting element 68 in the direction of 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 intensity of light projected to the fan unit 14 to provide 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, components with the same component names or component 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 element 68, and the backlight module 16J further includes a guide cut out of the buffer sheet 70 The light fin 74 and the top abutment 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 points toward the light emitting element 68, and the open end of the light guide fin 74 is bent toward the first light transmission area 641 or toward the second direction D2 due to the abutment of the abutting member 76. The incident light B output by the light emitting element 68 can be projected to the fan unit 14 through the internal total reflection of the light guide fin 74, which means that the backlight module 16J uses the bending of the light guide fin 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 recycling function, it can reflect the incident light B of the light-emitting element 68 back to the light guide fin 74 to increase the intensity of the illuminating light to improve the illuminating and decorative effects. The buffer sheet 70 of the tenth embodiment may be made of a light guide material. In this case, the light guide fin 74 may be a buffer fin formed by partially cutting the buffer sheet 70; or, if the buffer sheet 70 does not have light guide characteristics, the light guide wing The piece 74 may be an additional independent component installed. The corresponding structural relationship between the buffer sheet 70 and the light guide fin 74 is not limited to the previously disclosed implementation mode, and depends on the design requirements.

It should be supplemented that the backlight module 16G/16H/16I in Figure 11/12/13 may not include the first light source (and its light guide sheet/cover sheet/substrate sheet/reflective structure/ink, etc.) Provide lighting in the first direction D1, which is solely for the fan unit 14 lighting.

Please refer to Figures 15 and 16. Figure 15 is a schematic diagram of the bottom side appearance of the computing device 2 and the protective cover 200 in the eleventh embodiment of the present invention. Figure 16 is the keyboard 10A and the protective cover 200 in Figure 15 along B- Sectional view of the partial structure of B'connection. In the eleventh embodiment, elements with 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 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 case 200A and the lower case 200B of the protective cover 200, and the plurality of keys 12 are exposed outside the upper case 200A as shown in Fig. 1A. The backlight module 16K is arranged between the bottom of the keyboard 10A and the lower housing 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 housing 200B), or the backlight module 16K It is adjacent to the protective cover 200 (the lower housing 200B) along 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. The extension housing 200C can also be fixed to the housing of the computing device 2 itself through magnetism, without covering and accommodating the computing device 2 . The protective cover 200 can define the light-transmitting portion 201 in the lower housing 200B, for example, a single or multiple light-transmitting structure is formed by hollowing out or carving thin 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 luminous decorative pattern. The design position of the light-transmitting portion 201 or/or the second light-transmitting area 302 may not be limited to the above-disclosed implementation aspect. Both or one of them may be defined as brand logos, functional indications (such as incoming calls/letters/power) patterns, etc. Depends on actual needs.

With the backlight module disclosed in the present invention, the illuminating light of the backlight module in the keyboard can be guided and irradiated to different directions, which is used for the illumination of adjacent components in different positions, without greatly increasing the overall thickness of the device. , To achieve the decoration or indication function of double-sided backlight. The foregoing descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made in accordance with 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 sleeve 100A/200A: upper shell 100B/200B: lower shell 200C: Extension shell 101: light hole 201: Light penetration part 11: divider 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: Support 221: Hole 24: Thin film circuit board 25: bottom plate 26: light guide 261: reflective structure 262: open hole 28: cover sheet 281: The first covering layer 282: first light transmission zone 30: Substrate sheet 301: second covering layer 302: second light transmission zone 32: luminous parts 34: light guide 341: mounting hole 342: Breaking Hole 36: cover sheet 361: first light transmission zone 362: protruding part 362a: bending section 38: Substrate sheet 381: second light transmission zone 382: mounting hole 40: luminous parts 42: light guide 421: U-shaped groove 422: Light Guide Wing 422a: Light incident cross section 422b: light exit cross section 423: bottom side 44: cover sheet 441: Cover Wing 46: Substrate sheet 48: light-emitting parts 50: top piece 52: light guide 521: first piercing 54: Substrate sheet 541: second perforation 56: cover sheet 561: Third Piercing 58: luminous parts 60: light pipe 601: first end 602: second end 62: circuit board 64: divider 641: first light transmission zone 642: bending area 66: light source circuit board 68: luminous parts 70: buffer film 701: second light transmission zone 72: Light Pipe 721: first end 722: second end 74: light guide 76: top piece 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. Figure 1B is a schematic top view of the keyboard of the first embodiment of the present invention. Figure 2 is a cross-sectional view of part of the keyboard of Figure 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 the backlight module according to the 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. 8 and 9 are schematic diagrams of the backlight module of the sixth embodiment of the present invention in 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 diagram of the appearance of the substrate sheet according to the first embodiment of the present invention. Figure 15 is a schematic diagram of the bottom side appearance of the computing device and the protective cover of the eleventh embodiment of the present invention. Figure 16 is a sectional view of part of the keyboard of Figure 15.

10: keyboard

100: shell

100A: upper shell

100B: lower shell

101: light hole

12: Button

14: Fan unit

16: backlight module

18: keycap

20: reset piece

22: Support

24: Thin film circuit board

25: bottom plate

262: open hole

32: luminous parts

D1: First direction

D2: second direction

Claims (18)

A backlight module emits light toward a first direction and a second direction opposite to each other, the backlight module is adjacent to a plurality of keys along the first direction, and the backlight module includes: 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 a plurality of keys; A substrate sheet arranged 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 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 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 one first cover layer defining the first light-transmitting area, and the first cover layer includes an opaque ink layer and/or a reflective ink layer, The first covering layer does not include the opaque ink layer or the reflective ink layer in the first transparent area. The backlight module of claim 1, wherein the substrate sheet has at least one second covering layer to define the second light-transmitting area, the second covering layer includes a light-shielding ink layer and/or a light-reflecting ink layer, the The second covering layer does not include the light-shielding ink layer or the light-reflecting ink layer in the second light-transmitting area. The backlight module according to claim 1, wherein the light guide sheet has multiple groups of light-reflecting structures, and is arranged 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 casts it toward the second light transmission area. The backlight module according to claim 5, wherein the first covering layer includes a reflective ink layer, which is respectively coated on the plurality of protrusions. The backlight module according to claim 1, wherein the backlight module is adjacent to a protective cover along the second direction, the protective cover has at least one light penetrating portion, and the light penetrating portion corresponds to the substrate sheet The second light-transmitting area. The backlight module according to 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 according to claim 1, wherein the light guide sheet includes a U-shaped cut to define a light guide fin, and at least a part of a light exit section of the light guide fin is exposed to the light guide sheet A bottom side makes the second part of light partially irradiate toward the second direction. The backlight module according to claim 9, wherein an abutting member abuts the light guide fin and inclines toward the second direction by an angle, so that at least a part of the light exit section of the light guide fin is exposed to the guide The bottom side of the light sheet. The backlight module according to claim 10, wherein the cover sheet has a cover fin covering the light guide fin of the light guide sheet, and the abutting member abuts against the cover fin, and also against the guide The light fin is inclined to the second direction. A backlight module includes: A light guide sheet having at least one first perforation; A substrate sheet arranged on one side of the light guide sheet, the substrate sheet having at least one second perforation corresponding to the first perforation; A cover sheet arranged on the other side of the light guide sheet opposite to the base material sheet, the cover sheet having at least one third perforation corresponding to the first perforation; A light-emitting element corresponding to the first perforation, the second perforation and the third perforation; and A light pipe is adjacent to the light-emitting element along a second direction, and has 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 out of the substrate sheet. The backlight module according to 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 through the light guide The sheet illuminates the plurality of keys in the first direction, and the second light source penetrates the first perforation of the light guide sheet in the second direction. The backlight module according to claim 12, wherein the backlight module is arranged 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 one first light-transmitting area, and the backlight module The group contains: A light source circuit board arranged on the other side of the partition relative to the fan unit; A buffer sheet arranged between the partition and the light source circuit board; and A light-emitting element is disposed on the light source circuit board and corresponds to the first light-transmitting area of the partition, and the light-emitting element outputs an incident light through the first light-transmitting area and irradiates the fan in the second direction unit. The backlight module according to claim 15, wherein the backlight module further includes a light pipe having a first end and a second end opposite to each other, the first end points toward the light-emitting element, and the second end extends Enter the inside of the fan unit. The backlight module according to claim 15, wherein the buffer sheet has at least one raised structure to cover the light-emitting element. The backlight module according to claim 15, wherein the backlight module further comprises an abutment member and a light guide fin on the buffer sheet, one end of the light guide fin points toward the light-emitting member, and the abutment member tops The open end of the light guide fin that is bent against the bending points to the second direction.

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