TWI665703B - Backlight apparatus used in illuminated keyboard - Google Patents

Abstract

The invention discloses a backlight device for a light-emitting keyboard. The backlight device of the present invention includes a light guide plate and a light source. The front of the light guide plate defines a plurality of rectangular light emitting areas thereon. Each light emitting area corresponds to a keycap and is located below its corresponding keycap. The light guide plate is in each light-exiting area and has a plurality of mutually parallel micro chirped structures. The plurality of micro chirp structures in each light emitting area are arranged next to one of the four sides of the light emitting area. The light source is used to emit light and enter the light guide plate. The light is directed to a part of the plurality of micro chirp structures in each light emitting area, and a part of the light is adjusted by the plurality of micro chirp structures, and then directed to the keycap corresponding to the light emitting area.

Description

   Backlight device for illuminated keyboard   

The present invention relates to a backlight apparatus for a light-emitting keyboard, and more particularly, to a backlight apparatus for a light-emitting keyboard and capable of reducing light leakage at the edge of a keycap, especially at the lower edge.

Illuminated keyboards are common input peripheral devices on the market. The illuminated keyboard includes a backlight device and a plurality of keycaps disposed on the backlight device. The backlight device includes a light guide plate and a light source. The light source is used to emit light. The light enters the light guide plate and is guided to exit from the front of the light guide plate, and then to the keycap provided above.

However, in the current backlight device for a light-emitting keyboard, there is no light adjustment design on the front side of the light guide plate corresponding to the light emitting area of the keycap. Light leakage at the edge of the keycap, especially at the lower edge, may even strike the eyes of the user, making the eyes of the user uncomfortable.

Therefore, one technical problem to be solved by the present invention is to provide a backlight device for a light-emitting keyboard, and the backlight device according to the present invention can reduce light leakage around the keycaps of the light-emitting keyboard and further reduce the halo around the keycaps.

The backlight device according to the first preferred embodiment of the present invention is used for a light-emitting keyboard. The illuminated keyboard contains a number of keycaps. A plurality of keycaps are disposed on the backlight device according to the first preferred embodiment of the present invention. The backlight device according to the first preferred embodiment of the present invention includes a light guide plate and a light source. The light guide plate has a front side, a back side, a lower side, and an upper side opposite to the lower side, and defines a lateral direction parallel to the lower side and a longitudinal direction perpendicular to the lateral direction. The front of the light guide plate defines a plurality of rectangular light emitting areas thereon. Each light emitting area corresponds to a keycap and is located below its corresponding keycap. Each light emitting region has a first side near the lower side of the light guide plate, a second side near the upper side, a third side adjacent to the first side and the second side, and a first side adjacent to the second side and the third side The side is opposite the fourth side. The light guide plate is in each light-exiting area and has a plurality of first micro chirp structures parallel to each other. The plurality of first microcapsule structures in each light emitting area are arranged next to one of its first side, its second side, its third side, and its fourth side. The light source is used to emit light. The light enters the light guide plate, and is guided by the light guide plate to exit from the front. The first part of the light directed to the plurality of first microcapsule structures in each light emitting area is adjusted by the plurality of first microcapsule structures, and then directed to the keycap corresponding to the light emitting area.

In a specific embodiment, the light guide plate of the backlight device according to the first preferred embodiment of the present invention further includes a plurality of light turning structures. A plurality of light turning structures are formed on the back of the light guide plate. The plurality of light turning structures are used to guide the light rays directed to the plurality of light turning structures to the front of the light guide plate.

Further, the backlight device according to the first preferred embodiment of the present invention further includes a reflective layer. The light-reflecting layer is disposed on the back surface of the light guide plate, and is used to reflect the light directed to the light-reflecting layer.

In a specific embodiment, the cross section of each first micro- 稜鏡 structure may be an inverted V-shaped protrusion, an inverted U-shaped protrusion, a V-shaped groove, a U-shaped groove, or other shaped protrusions or grooves .

According to a variant of the backlight device according to the first preferred embodiment of the present invention, the plurality of first microcapsule structures in each light-exiting region extend in the lateral direction and are arranged next to the first side thereof. The light guide plate is in each light-exiting area and has a plurality of second microcapsule structures extending in the transverse direction and arranged next to its second side, and a plurality of third microstructures extending in the longitudinal direction and arranged next to its third side. A puppet structure and a plurality of fourth micro-puppet structures extending in the longitudinal direction and arranged next to the fourth side thereof. The light is directed to the second part of the plurality of second microcapsule structures in each light emitting area, and the second part of the light is adjusted by the plurality of second microcapsule structures, and then directed to the keycap corresponding to the light emitting area. The light is directed to the third part of the plurality of third microcapsule structures in each light emitting area. The third part of the light is adjusted by the plurality of third microcapsule structures, and then directed to the keycap corresponding to the light emitting area. The light is directed to the fourth part of the plurality of fourth micro-capsule structures in each light-emitting area, and the fourth part of the light is adjusted by the plurality of fourth micro-capsule structures, and then directed to the keycap corresponding to the light-emitting area.

The backlight device according to the second preferred embodiment of the present invention is used for a light-emitting keyboard. The illuminated keyboard contains a number of keycaps. A plurality of keycaps are disposed on the backlight device according to the second preferred embodiment of the present invention. The backlight device according to the second preferred embodiment of the present invention includes a light guide plate, a thin sheet, and a light source. The light guide plate has a front surface and a back surface.稜鏡 The thin plate is disposed above the front of the light guide plate. The 稜鏡 sheet has an upper surface, a lower surface, a lower side, and an upper side opposite to the lower side, and defines a lateral direction parallel to the lower side and a longitudinal direction of the vertical lateral direction. The thin plate defines a plurality of rectangular light emitting areas on the upper surface. Each light emitting area corresponds to a keycap, and is located below the corresponding keycap and has a first side near the lower side, a second side near the upper side, a third side adjacent to the first side and the second side, and A fourth side adjacent to the first side and the second side and opposite to the third side. The chirped sheet is in each light emitting area and includes a plurality of first micro chirped structures parallel to each other. The plurality of first microcapsule structures in each light emitting area are arranged next to one of its first side, its second side, its third side, and its fourth side. The light source is used to emit light. Light enters the light guide plate. The light is guided by the light guide plate and exits from the front, passes through the thin plate and advances toward the plurality of keycaps. The first part of the light directed to the plurality of first microcapsule structures in each light emitting region is adjusted by the plurality of first microcapsule structures, and then directed to the keycap corresponding to the light emitting region.

The backlight device according to the third preferred embodiment of the present invention is used for a light-emitting keyboard. The illuminated keyboard contains a number of keycaps. A plurality of keycaps are disposed on the backlight device according to the third preferred embodiment of the present invention. The backlight device according to the third preferred embodiment of the present invention includes a light guide plate, a thin sheet, and a light source. The light guide plate has a front surface and a back surface.稜鏡 The thin plate is disposed above the front of the light guide plate. The 稜鏡 sheet has an upper surface, a lower surface, and a lower side, and defines a horizontal direction parallel to the lower side and a vertical direction of the vertical lateral direction. The thin plate defines a plurality of rectangular light emitting areas on the lower surface. Each light emitting area corresponds to a keycap, and is located below the corresponding keycap and has a first side near the lower side, a second side near the upper side, a third side adjacent to the first side and the second side, and A fourth side adjacent to the first side and the second side and opposite to the third side. The chirped sheet is in each light emitting area and includes a plurality of first micro chirped structures parallel to each other. The plurality of first microcapsule structures in each light emitting area are arranged next to one of its first side, its second side, its third side, and its fourth side. The light source is used to emit light. Light enters the light guide plate. The light is guided by the light guide plate and exits from the front, passes through the thin plate and advances toward the plurality of keycaps. The first part of the light directed to the plurality of first microcapsule structures in each light emitting area is adjusted by the plurality of first microcapsule structures, and then directed to the keycap corresponding to the light emitting area.

Different from the prior art, the backlight device according to the present invention is used in a light-emitting keyboard, which can reduce light leakage at the lower edge of the keycap of the light-emitting keyboard and avoid discomfort to the eyes of the user.

The advantages and spirit of the present invention can be further understood through the following detailed description of the invention and the accompanying drawings.

1‧‧‧ illuminated keyboard

10‧‧‧Keyboard Department

102‧‧‧button

104‧‧‧Keycap

1042‧‧‧light-transmitting area

105‧‧‧ Reply component

106‧‧‧Lifting mechanism

108‧‧‧Switch

1082‧‧‧ on thin film circuit

1084‧‧‧ under thin film circuit

1086‧‧‧Isolation member

12‧‧‧ floor

122‧‧‧through hole

2‧‧‧ backlight

20‧‧‧light guide

201‧‧‧ Positive

202‧‧‧Back

203‧‧‧ lower side

204‧‧‧ Upper side

205‧‧‧light steering structure

206‧‧‧side

22‧‧‧light source

24‧‧‧light-emitting area

242‧‧‧First side

244‧‧‧Second Side

246‧‧‧ Third side

248‧‧‧ Fourth side

252‧‧‧The first micro- 稜鏡 structure

254‧‧‧Second micro- 稜鏡 structure

256‧‧‧Third micro- 稜鏡 structure

258‧‧‧Fourth micro 稜鏡 structure

26‧‧‧Reflective layer

28‧‧‧ shading layer

282‧‧‧ broken hole

3‧‧‧ backlight

30‧‧‧light guide

301‧‧‧front

302‧‧‧Back

303‧‧‧ lower side

305‧‧‧light turning structure

306‧‧‧side

31‧‧‧ 稜鏡 Sheet

311‧‧‧upper surface

312‧‧‧ lower surface

313‧‧‧ lower side

314‧‧‧upper side

318‧‧‧ Hollow

32‧‧‧ light source

332‧‧‧The first micro 稜鏡 structure

334‧‧‧Second micro- 稜鏡 structure

336‧‧‧Third micro- 稜鏡 structure

338‧‧‧Fourth micro 稜鏡 structure

34‧‧‧light-emitting area

342‧‧‧first side

344‧‧‧Second side

346‧‧‧ Third side

348‧‧‧ Fourth side

349‧‧‧Reserved

35‧‧‧First reflective layer

36‧‧‧ shading layer

38‧‧‧Second reflective layer

4‧‧‧ backlight

40‧‧‧light guide

401‧‧‧front

402‧‧‧Back

403‧‧‧ lower side

405‧‧‧light turning structure

406‧‧‧side

41‧‧‧ 稜鏡 Sheet

411‧‧‧upper surface

412‧‧‧ lower surface

413‧‧‧ lower side

414‧‧‧upper side

418‧‧‧ Hollow

42‧‧‧light source

432‧‧‧The first micro 稜鏡 structure

434‧‧‧Second micro- 稜鏡 structure

436‧‧‧Third micro- 稜鏡 structure

438‧‧‧The fourth micro- 稜鏡 structure

44‧‧‧light-emitting area

442‧‧‧first side

444‧‧‧Second Side

446‧‧‧ Third side

448‧‧‧ Fourth side

449‧‧‧ Reserved

45‧‧‧first reflective layer

46‧‧‧Light-shielding layer

48‧‧‧Second reflective layer

T‧‧‧Horizontal orientation

L‧‧‧ Longitudinal direction

FIG. 1 is a development view of components of a light-emitting keyboard using a backlight device according to a first preferred embodiment of the present invention.

FIG. 2 is a cross-sectional view of the illuminated keyboard in FIG. 1 along line A-A.

3 is a partial top view of a light guide plate of a backlight device according to a first preferred embodiment of the present invention.

4, 5, 6, and 7 are partial cross-sectional views of the light guide plate in FIG. 3 along line B-B.

FIG. 8 is a partial top view of a modified light guide plate of one of the backlight devices according to the first preferred embodiment of the present invention.

FIG. 9 is a partial cross-sectional view of the light guide plate taken along the line C-C in FIG. 8.

10 is a development view of components of a light-emitting keyboard using a backlight device according to a second preferred embodiment of the present invention.

FIG. 11 is a cross-sectional view of the illuminated keyboard in FIG. 10 along line D-D.

FIG. 12 is a partial top view of a modified thin sheet of one of the backlight devices according to a second preferred embodiment of the present invention.

Fig. 13 is a partial cross-sectional view of the concrete sheet in Fig. 12 taken along line E-E.

FIG. 14 is a development view of components of a light-emitting keyboard using a modification of a backlight device according to a second preferred embodiment of the present invention.

Fig. 15 is a partial cross-sectional view of the concrete sheet in Fig. 14 taken along line F-F.

FIG. 16 is a partial cross-sectional view showing a modification of a backlight device according to a second preferred embodiment of the present invention and a light-emitting keyboard using the modification of the backlight device of the present invention.

Fig. 17 is a development view of components of a light-emitting keyboard using a backlight device according to a third preferred embodiment of the present invention.

FIG. 18 is a cross-sectional view of the illuminated keyboard in FIG. 17 along line G-G.

FIG. 19 is a partial bottom view of a modified thin sheet of one of the backlight devices according to a third preferred embodiment of the present invention. FIG.

Fig. 20 is a partial cross-sectional view of the concrete sheet in Fig. 19 taken along line H-H.

21 is a development view of components of a light-emitting keyboard using a modification of a backlight device according to a third preferred embodiment of the present invention.

Fig. 22 is a partial cross-sectional view of the concrete sheet in Fig. 21 taken along the line I-I.

FIG. 23 is a partial cross-sectional view of a modification of a backlight device according to a third preferred embodiment of the present invention and a light-emitting keyboard using the modification of the backlight device of the present invention.

See Figures 1 to 9. FIG. 1 is a schematic diagram illustrating a backlight device 2 according to a first preferred embodiment of the present invention and a light-emitting keyboard 1 using the backlight device 2 of the present invention in an element development view. FIG. 2 is a partial cross-sectional view of the illuminated keyboard 1 taken along line A-A in FIG. 1. FIG. 3 is a partial top view of the light guide plate 20 to show a light emitting area 24 near one of the lower sides 203 of the light guide plate 20. 4, 5, 6, and 7 are partial cross-sectional views of the light guide plate 20 along line B-B in FIG. 3, respectively. FIG. 8 is a partial top view of a modified light guide plate 20 of one of the backlight devices 2 according to the first preferred embodiment of the present invention to show a light emitting area 24 near one of the lower sides 203 of the light guide plate 20. FIG. 9 is a partial cross-sectional view of the light guide plate 20 along line C-C in FIG. 8.

As shown in FIG. 1, the light-emitting keyboard 1 using the backlight device 2 of the present invention includes a bottom plate 12, the backlight device 2 of the first preferred embodiment of the present invention, and a keyboard portion 10. The bottom plate 12 is disposed on the backlight device 2, and the keyboard portion 10 is disposed on the bottom plate 12, but is not limited thereto. In a modification, the backlight device 2 may be disposed on the base plate 12, and the keyboard portion 10 may be disposed on the backlight device 2.

The keyboard section 10 includes a plurality of keys 102. The light emitted from the front surface 201 of the light guide plate 20 of the backlight device 2 passes through the bottom plate 12 and is directed toward the plurality of keys 102. The base plate 12 must be transparent. The bottom plate 12 shown in FIG. 1 has a plurality of through holes 122 to facilitate increasing the light flux.

As shown in FIGS. 1 and 2, the illuminated keyboard 1 includes a plurality of keycaps 104. The plurality of keycaps 104 are disposed on the backlight device 2 according to the first preferred embodiment of the present invention. The backlight device 2 according to the first preferred embodiment of the present invention includes a light guide plate 20 and a light source 22.

In a specific embodiment, the light guide plate 20 may be made of acrylic, silicone, thermoplastic polyurethane (TPU), or other commercially available light-guiding polymer materials. The layer thickness of the light guide plate 20 may be determined as needed, and is not particularly limited. For example, when applied to thin light-emitting keys, the thickness of the light guide plate 20 ranges from about 0.125 mm to 0.25 mm. Furthermore, the thickness of the light guide plate 20 may be less than 0.125 mm.

As shown in FIGS. 1 and 2 as well, the light guide plate 20 has a front surface 201, a back surface 202, a lower side surface 203, and an upper side surface 204 opposite to the lower side surface 203, and defines a transverse direction T parallel to the lower side surface 203 and perpendicular to the transverse direction T Longitudinal direction L. The front side 201 of the light guide plate 20 defines a plurality of rectangular light emitting areas 24 thereon. Each light emitting area 24 corresponds to a keycap 104 and is located below the corresponding keycap 104. Because the light emitting area 24 is not a solid structure, it is indicated by a dashed line in FIG. 1.

As shown in FIGS. 1 and 3, each light emitting region 24 has a first side 242 near the lower side 203 of the light guide plate 20, a second side 244 near the upper side 204, and abutting the first side 242 and the second side 244. A third side 246 and a fourth side 248 adjacent to the first side 242 and the second side 244 and opposite to the third side 246. The light guide plate 20 is in each of the light-exiting regions 24 and has a plurality of first micro chirp structures 252 parallel to each other. The plurality of first microcapsule structures 252 in each light emitting region 24 are arranged next to one of the first side 242, the second side 244, the third side 246, and the fourth side 248 thereof. In the examples shown in FIG. 1 and FIG. 3, the plurality of first microcapsule structures 252 in each light-exiting region 24 are arranged adjacent to the first edge 242 thereof.

As shown in FIG. 1, the light source 22 is configured to emit light, and the light is incident into the light guide plate 20. The light is guided by the light guide plate 20 and exits from the front surface 201, and proceeds toward the plurality of keycaps 104. In a specific embodiment, the light source 22 may include a plurality of light emitting diode elements or organic light emitting diode elements, but the present invention is not limited thereto.

In a specific embodiment, as shown in the example shown in FIG. 1, the light source 22 is disposed adjacent to the side surface 206 of the light guide plate 20, and the light emitted by the light source 22 enters the light guide plate 20 from the side surface 206.

In another specific embodiment, the light guide plate 20 further has a plurality of through openings (not shown in the figure). In particular, the plurality of through openings are arranged substantially along the center line of the vertical lower side surface 203. Each opening has its own light incident surface. The light source 22 includes a plurality of light emitting elements, and each light emitting element corresponds to an opening. Each light-emitting element is placed in its corresponding opening. The light emitted by each light emitting element enters the light guide plate 20 from the light incident surface of its corresponding opening.

In another specific embodiment, the light guide plate 20 further has a plurality of openings (not shown in the figure). In particular, the openings are formed on the back surface 202 of the light guide plate 20 and are close to the lower side 203 of the light guide plate 20. Each opening has its own light incident surface. The light source 22 includes a plurality of light emitting elements, and each light emitting element corresponds to an opening. Each light-emitting element is placed in its corresponding opening. The light emitted by each light emitting element enters the light guide plate 20 from the light incident surface of its corresponding opening.

As shown in FIG. 2, the illuminated keyboard 1 using the backlight device 2 of the present invention further includes a keycap 104, a recovery element 105, a lifting mechanism 106, and a membrane switch 108. One end of the lifting mechanism 106 is movably connected to the keycap 104 and the other end is movably connected to the bottom plate 12. The keycap 104 is mounted on the lifting mechanism 106. The lifting mechanism 106 supports the keycap 104 for vertical movement relative to the switch 108. The lifting mechanism 106 shown in FIG. 2 is a scissor-type lifting mechanism, and the restoring element 105 is an elastic dome. In another preferred embodiment, the lifting mechanism 106 is a butterfly-type lifting mechanism, and the recovery element 105 is an elastic piece. In another preferred embodiment, the recovery element 105 is a magnetic element, and the structure of the key 102 of the present invention may also be a magnetic key.

The switch 108 is composed of an upper thin film circuit 1082 and a lower thin film circuit 1084, and the upper thin film circuit 1082 and the lower thin film circuit 1084 are separated by an isolation member 1086. The recovery element 105 is disposed on the upper thin film circuit 1082. As shown in FIG. 2, the recovery element 105 may be a resilient dome, but is not limited thereto. An external force is applied to the keycap 104 to move the keycap 104 toward the upper film circuit 1082. The recovery element 105 deforms with the movement of the keycap 104 to actuate the deformation of the upper thin film circuit 1082 and move toward the lower thin film circuit 1084, thereby turning on the switch 108.

As shown in FIG. 2, the first part of the light directed to the plurality of first microcapsule structures 252 in each light emitting region 24 is adjusted by the plurality of first microcapsule structures 252, and then directed to the corresponding light output. The keycap 104 of area 24. In FIG. 2, the dashed line represents the traveling route of the light originally not adjusted by the first microcapsule structure 252. The light traveling along this route is most likely to hit the eyes of the user, making the user's eyes uncomfortable. The upper thin film circuit 1082, the lower thin film circuit 1084, and the recovery element 105 may be made of a transparent or translucent material, so that light can pass directly to reach the keycap 104.

In a specific embodiment, the light guide plate 20 further includes a plurality of light turning structures 205. The plurality of light turning structures 205 are formed on the back surface 202 of the light guide plate 20 to guide the light rays directed to the plurality of light turning structures 205 to the front side 201 of the light guide plate 20. The plurality of light turning structures 205 may also be partially formed on the back surface 202 of the light guide plate 20, which guides the light to advance toward the light-transmitting area 1042 of the corresponding keycap 104, as shown in FIG. 2. The light-transmitting area 1042 of the keycap 104 corresponds to a pattern, which represents one of characters, numbers, symbols, and function keys. The plurality of light turning structures 205 can be formed by printing dot-shaped light (for example, white) ink on the back surface 202 of the light guide plate 20, or can be formed by micro-lens, or can be integrally formed with the light guide plate 20 by coating. . However, the formation of the plurality of light turning structures 205 is not limited to the above process.

Further, as shown in FIG. 2, the backlight device 2 according to the first preferred embodiment of the present invention further includes a reflective layer 26. The light-reflecting layer 26 is disposed on the back surface 202 of the light guide plate 20, and is configured to reflect the light rays directed to the light-reflecting layer 26. The reflective layer 26 may be formed of a white polyester film, but is not limited thereto.

In a specific embodiment, the cross section of each first micro- 稜鏡 structure 252 may be inverted V-shaped protrusions (as shown in FIG. 4), inverted U-shaped protrusions (as shown in FIG. 5), and V-shaped grooves. Grooves (as shown in FIG. 6), U-shaped grooves (as shown in FIG. 7), or other shapes of protrusions or grooves.

Further, as shown in FIG. 2, the backlight device 2 according to the first preferred embodiment of the present invention further includes a light shielding layer 28. The light shielding layer 28 is disposed on the front surface 201 of the light guide plate 20. The light-shielding layer 28 has a plurality of holes (or light-transmitting regions) 282. Each hole corresponds to a light emitting area 24. The light-shielding layer 28 is configured to block light from being emitted from areas other than the plurality of light-exiting areas 24.

In a specific embodiment, as shown in FIG. 8 and FIG. 9, the plurality of first micro- 稜鏡 structures 252 in each light-exiting area 24 extend along the lateral direction T and are arranged next to the first side 242 thereof. The light guide plate 20 is in each light-exiting area 24 and has a plurality of second microcapsule structures 254 extending in the lateral direction T, a plurality of third microcapsule structures 256 extending in the longitudinal direction L, and a plurality of longitudinal directions L. Extending the fourth microcapsule structure 258. The plurality of second microcapsule structures 254 in each light emitting region 24 are arranged next to the second edge 244 thereof. The plurality of third microcapsule structures 256 in each light emitting region 24 are arranged next to the third side 246 thereof. A plurality of fourth microcapsule structures 258 in each light emitting area 24 are arranged next to the fourth side 248 thereof. The light is directed to the second portion of the plurality of second micro-capsule structures 254 in each light-emitting region 24. The second portion of the light is adjusted by the plurality of second micro-capsule structures 254, and then directed to the keycap 104 corresponding to each light-emitting region 24 . The light is directed to the third portion of the plurality of third micro-capsule structures 256 in each light-emitting region 24. The light is adjusted by the plurality of third micro-capsule structures 256, and then directed to the keycap 104 corresponding to each of the light-emitting regions 24. . The light is directed to the fourth part of the plurality of fourth micro-capsule structures 258 in each light-emitting region 24. The light is adjusted by the plurality of fourth micro-capsule structures 258, and then directed to the keycap 104 corresponding to each of the light-emitting regions 24. . Thereby, the backlight device 2 according to the first preferred embodiment of the present invention can reduce light leakage at the lower edge of the keycap 104 of the illuminated keyboard 1. The first micro chirped structure 252, the second micro chirped structure 254, the third micro chirped structure 256, and the fourth micro chirped structure 258 use the principle of refraction to adjust the transmission path of light.

Similarly, the cross sections of the second micro- 稜鏡 structure 254, the third micro- 稜鏡 structure 256, and the fourth micro- 稜鏡 structure 258 can be inverted V-shaped protrusions, inverted U-shaped protrusions, V-shaped grooves, U-shaped protrusions. Or other shaped protrusions or grooves.

Please refer to FIGS. 10 to 13. FIG. 10 is a schematic diagram illustrating a backlight device 3 according to a second preferred embodiment of the present invention and a light-emitting keyboard 1 using the backlight device 3 of the present invention in a developed view of components. FIG. 11 is a partial cross-sectional view of the illuminated keyboard 1 taken along line D-D in FIG. 10. FIG. 12 is a partial top view of a modified thin sheet 31 according to one of the backlight devices 3 according to the second preferred embodiment of the present invention, so as to show a light emitting area 34 near one of the lower sides 313 of the thin sheet 31. FIG. 13 is a partial cross-sectional view of the concrete sheet 31 taken along line E-E in FIG. 12.

As shown in FIG. 10, the light-emitting keyboard 1 using the backlight device 3 of the present invention includes a bottom plate 12, a backlight device 3 and a keyboard portion 10 according to a second preferred embodiment of the present invention. The bottom plate 12 is disposed on the backlight device 3, and the keyboard portion 10 is disposed on the bottom plate 12, but is not limited thereto. In a variant, the backlight device 3 may be disposed on the bottom plate 12, and the keyboard portion 10 may be disposed on the backlight device 3.

The keyboard section 10 includes a plurality of keys 102. The light emitted from the front surface 301 of the light guide plate 30 of the backlight device 3 passes through the thin plate 31 and the bottom plate 12 and is directed toward the plurality of keys 102. Elements in FIG. 10 having the same numbers as those in FIG. 1 have the same or similar structures and functions, and details are not described herein again.

As shown in FIGS. 10 and 11, the illuminated keyboard 1 includes a plurality of keycaps 104. The plurality of keycaps 104 are disposed on the backlight device 3 according to the second preferred embodiment of the present invention. The backlight device 3 according to the second preferred embodiment of the present invention includes a light guide plate 30, a thin plate 31, and a light source 32.

As shown in FIGS. 10 and 11, the light guide plate 30 includes a front surface 301 and a rear surface 302. The thin sheet 31 is disposed above the front surface 301 of the light guide plate 30. The thin sheet 31 has an upper surface 311, a lower surface 312, a lower side surface 313, and an upper side surface 314 opposite to the lower side surface 313, and defines a transverse direction T parallel to the lower side surface 313 and a longitudinal direction L of the vertical transverse direction T. The thin sheet 31 defines a plurality of rectangular light emitting regions 34 on the upper surface 311. Each light emitting area 34 corresponds to a keycap 104 and is located below the corresponding keycap 104. Because the plurality of light emitting regions 34 are non-solid structures, they are indicated by dashed lines in FIG. 10.

As shown in FIG. 10, each light emitting region 34 has a first side 342 near the lower side 313, a second side 344 near the upper side 314, a third side 346 adjacent to the first side 342 and the second side 344, and an abutment. The first side 342 is opposite to the second side 344 and the fourth side 348 opposite to the third side 346. The ytterbium sheet 31 is in each of the light emitting regions 34 and includes a plurality of first micro-ytterbium structures 332 parallel to each other. The plurality of first microcapsule structures 332 in each light emitting region 34 are arranged next to one of its first side 342, its second side 344, its third side 346, and its fourth side 348. In the examples shown in FIG. 10 and FIG. 11, the plurality of first microcapsule structures 332 in each light emitting region 34 are arranged next to the first side 342 thereof.

As shown in FIG. 10, the light source 32 is used to emit light. The light enters the light guide plate 30. In a specific embodiment, the light source 32 may include a plurality of light emitting diode elements or organic light emitting diode elements, but the present invention is not limited thereto.

In a specific embodiment, as shown in the example shown in FIG. 10, the light source 32 is disposed adjacent to the side surface 306 of the light guide plate 30, and the light emitted by the light source 32 enters the light guide plate 30 from the side surface 306.

In another specific embodiment, the light guide plate 30 further has a plurality of through openings (not shown in the figure). In particular, the plurality of through openings are generally arranged along a center line of the vertical lower side surface 303. Each opening has its own light incident surface. The light source 32 includes a plurality of light emitting elements, and each light emitting element corresponds to an opening. Each light-emitting element is placed in its corresponding opening. The light emitted by each light emitting element enters the light guide plate 30 from the light incident surface of its corresponding opening.

In another specific embodiment, the light guide plate 30 further has a plurality of openings (not shown in the figure). In particular, the openings are formed on the back surface 302 of the light guide plate 30 and are close to the lower side surface 303 of the light guide plate 30. Each opening has its own light incident surface. The light source 32 includes a plurality of light emitting elements, and each light emitting element corresponds to an opening. Each light-emitting element is placed in its corresponding opening. The light emitted by each light emitting element enters the light guide plate 30 from the light incident surface of its corresponding opening.

In a specific embodiment, the cross section of each of the first micro- 稜鏡 structures 332 may be an inverted V-shaped protrusion, an inverted U-shaped protrusion, a V-shaped groove, a U-shaped groove, or other shapes of protrusions or grooves. groove.

As shown in FIG. 11, the light is guided by the light guide plate 30 to exit from the front surface 301, passes through the thin plate 31, and advances toward the plurality of keycaps 104. The light is directed toward the first part of the plurality of first micro-capsule structures 332 in each light-emitting region 34. The first portion of the light is adjusted by the plurality of first micro-capsule structures 332, and then directed to the keycap 104 corresponding to the light-emitting regions 34. . In FIG. 11, a dashed line represents a traveling route of light originally not adjusted by the first micro-capsule structure 332. The light traveling along this route is most likely to hit the eyes of the user, making the user's eyes uncomfortable. The first micro chirped structure 332 uses the principle of refraction to adjust the transmission path of light.

As shown in FIG. 10, a plurality of first micro-chirped structures 332 of adjacent light-exiting regions 34 are connected together. That is, the plurality of first micro- 稜鏡 structures 332 distribute most of the area of the upper surface 311 of the thin plate 31.

As shown in FIG. 11, the light guide plate 30 further includes a plurality of light turning structures 305. The plurality of light turning structures 305 are formed on the back surface 302 of the light guide plate 30 to guide the light rays directed to the plurality of light turning structures 305 to the front surface 301 of the light guide plate 30. The plurality of light turning structures 305 may also be partially formed on the back surface 302 of the light guide plate 30, which guides light to advance toward the light-transmitting area 1042 of the corresponding keycap 104, as shown in FIG. 11. The plurality of light turning structures 305 may be formed by printing dot-shaped light (for example, white) ink on the back surface 302 of the light guide plate 30, or may be formed with the light guide plate 30 integrally by using a microstructure or a coating method. However, the formation of the plurality of light turning structures 305 is not limited to the above process.

Further, as shown in FIG. 11, the backlight device 3 according to the second preferred embodiment of the present invention further includes a first light reflecting layer 35 and a light shielding layer 36. The first light reflecting layer 35 is formed on the upper surface 311 of the thin sheet 31 except for a plurality of light emitting regions 34. The first light-reflecting layer 35 is used to reflect light rays directed toward the first light-reflecting layer 35. The light-shielding layer 36 is formed on the first light-reflecting layer 35, and is used to block light from exiting through a part of the light of the first light-reflecting layer 35.

In a specific embodiment, the first reflective layer 35 may be formed of a light-colored ink layer, for example, a white ink layer. The light shielding layer 36 may be formed of a dark ink layer, for example, a black ink layer.

Further, as shown in FIG. 11, the backlight device 3 according to the second preferred embodiment of the present invention further includes a second reflective layer 38. The second light-reflecting layer 38 is disposed under the rear surface of the light guide plate 30. The second light-reflecting layer 38 is used to reflect light rays directed toward the second light-reflecting layer 38. The second reflective layer 38 may be formed of a white polyester film, but is not limited thereto.

In a specific embodiment, as shown in FIG. 12 and FIG. 13, the plurality of first micro- 稜鏡 structures 332 in each light-exiting area 34 extend along the lateral direction T and are arranged next to the first side 332 thereof. The cymbal sheet 31 is in each light-emitting area 34 and has a plurality of second micro-chirped structures 334 extending in the transverse direction T, a plurality of third micro-chirped structures 336 extending in the longitudinal direction L, and a plurality of longitudinally-oriented structures The L extended fourth microfluorene structure 338. A plurality of second microcapsule structures 334 in each light emitting region 34 are arranged next to the second side 344 thereof. The plurality of third microcapsule structures 336 in each light emitting region 34 are arranged next to the third side 346 thereof. The plurality of fourth microcapsule structures 338 in each light emitting region 34 are arranged next to the fourth side 348 thereof. The light is directed to the second portion of the plurality of second micro-capsule structures 334 in each light-emitting region 34. The second portion of the light is adjusted by the plurality of second micro-capsule structures 334, and then directed to the keycap 104 corresponding to each of the light-emitting regions 34. . The light is directed to the third portion of the plurality of third micro-capsule structures 336 in each light-emitting region 34. The light is adjusted by the plurality of third micro-capsule structures 336, and then directed to the keycap 104 corresponding to each of the light-emitting regions 34. . The light is directed to the fourth part of the plurality of fourth micro-capsule structures 338 in each light-emitting region 34. The light is adjusted by the plurality of fourth micro-capsules 338, and then directed to the keycap 104 corresponding to each light-emitting region 34. . Thereby, the backlight device 3 according to the second preferred embodiment of the present invention can reduce light leakage at the lower edge of the keycap 104 of the illuminated keyboard 1. The first micro chirped structure 332, the second micro chirped structure 334, the third micro chirped structure 336, and the fourth micro chirped structure 338 use the principle of refraction to adjust the transmission path of light.

Similarly, the cross-sections of the second micro- 稜鏡 structure 334, the third micro- 稜鏡 structure 336, and the fourth micro- 稜鏡 structure 338 can be inverted V-shaped protrusions, inverted U-shaped protrusions, V-shaped grooves, U-shaped protrusions. Or other shaped protrusions or grooves.

Please refer to FIG. 14 and FIG. 15. FIG. 14 is a schematic diagram showing a modification of one of the backlight devices 3 of the second preferred embodiment of the present invention and a light-emitting keyboard 1 using the backlight device 3 in a developed view of components. FIG. 15 is a partial cross-sectional view of the illuminated keyboard 1 taken along line F-F in FIG. 14.

As shown in FIG. 14, the plurality of first micro chirp structures 332 of the adjacent light emitting regions 34 are connected together. The plurality of first micro-condyle structures 332 are distributed over the upper surface 311 of the condyle sheet 31. The plurality of first microcapsule structures 332 may be arranged in parallel in the lateral direction T or the longitudinal direction L. In the example shown in FIG. 14, the plurality of first micro- 稜鏡 structures 332 are arranged in parallel along the lateral direction T. Elements in FIG. 14 having the same numbers as those in FIG. 10 have the same or similar structures and functions, and details are not described herein again.

The thin sheet 31 is in each light-emitting area 34 and has a hollow portion 318. There is a reserved portion between the hollow portion 318 in each light emitting area 34 and the first side 342, the second side 344, the third side 346, and the fourth side 348 of the light emitting area 34 349. The plurality of first micro chirped structures 332 in the reserved portion 349 of each light emitting region 34 are still retained.

As shown in FIG. 15, the light is guided by the light guide plate 30 and exits from the front side 301, passes through the thin plate 31, and advances toward the plurality of keycaps 104. Part of the light that is directed to the plurality of first microcapsule structures 332 in the remaining portion 349 of each light emitting region 34 is adjusted by the plurality of first microcapsule structures 332, and then directed to the corresponding light emitting regions 34. Keycap 104. In FIG. 15, a dashed line represents a traveling route of light that has not been adjusted by the plurality of first microcapsule structures 332. The light traveling along this route is likely to hit the eyes of the user, making the user's eyes uncomfortable. The plurality of first micro chirped structures 332 use the principle of refraction to adjust the transmission path of light. There is a reserved portion between the hollow portion 318 in each light emitting area 34 and the first side 342, the second side 344, the third side 346, and the fourth side 348 of the light emitting area 34 The plurality of first microcapsule structures 332 remaining in 349 can reduce light leakage around the keycap 104 and further reduce halo around the keycap 104. Elements in FIG. 15 having the same numbers as those in FIG. 11 have the same or similar structures and functions, and details are not described herein again.

See Figure 16. FIG. 16 is a partial cross-sectional view of a backlight device 3 according to a modification of the second preferred embodiment of the present invention and a light-emitting keyboard 1 employing the modification of the backlight device 3 of the present invention. The section shown in FIG. 16 has the same definition as the section line D-D in FIG. 10.

As shown in FIG. 16, the light guide plate 30 further includes a plurality of light turning structures 305. The plurality of light turning structures 305 are formed on the front surface 301 of the light guide plate 30 to scatter the light rays directed toward the plurality of light turning structures 305. The plurality of light turning structures 305 may also be partially formed on the front surface 301 of the light guide plate 30, as shown in FIG. 11. The plurality of light turning structures 305 may be formed by printing dot-shaped light (for example, white) ink on the back surface 302 of the light guide plate 30, or may be formed with the light guide plate 30 integrally by a microstructure or a coating method. However, the formation of the plurality of light turning structures 305 is not limited to the above process. The plurality of light turning structures 305 formed on the front surface 301 of the light guide plate 30 makes the overall light directed to the keycap 104 softer, but the brightness is not attenuated. Elements in FIG. 16 having the same numbers as those in FIG. 11 have the same or similar structures and functions, and details are not described herein again.

Please refer to FIGS. 17 to 20. FIG. 17 is a schematic diagram illustrating a backlight device 4 according to a third preferred embodiment of the present invention and a light-emitting keyboard 1 using the backlight device 4 of the present invention in a component development view. FIG. 18 is a partial cross-sectional view of the illuminated keyboard 1 taken along line G-G in FIG. 17. FIG. 19 is a partial bottom view of a modified thin sheet 41 according to one of the backlight devices 4 according to the third preferred embodiment of the present invention, so as to show a light emitting area 44 near one of the lower sides 413 of the thin sheet 41. FIG. 20 is a partial cross-sectional view of the condyle sheet 41 in FIG. 19 taken along the line H-H.

As shown in FIG. 17, the light-emitting keyboard 1 using the backlight device 4 of the present invention includes a bottom plate 12, a backlight device 4 and a keyboard portion 10 according to a third preferred embodiment of the present invention. The bottom plate 12 is disposed on the backlight device 4, and the keyboard portion 10 is disposed on the bottom plate 12, but is not limited thereto. In a variant, the backlight device 4 may be disposed on the bottom plate 12, and the keyboard portion 10 may be disposed on the backlight device 4.

The keyboard section 10 includes a plurality of keys 102. The light emitted from the front surface 401 of the light guide plate 40 of the backlight device 4 passes through the thin plate 41 and the bottom plate 12 and is directed toward the plurality of keys 102. Elements in FIG. 17 having the same numbers as those in FIG. 1 have the same or similar structures and functions, and details are not described herein again.

As shown in FIGS. 17 and 18, the illuminated keyboard 1 includes a plurality of keycaps 104. The plurality of keycaps 104 are disposed on the backlight device 4 according to the third preferred embodiment of the present invention. The backlight device 4 according to the third preferred embodiment of the present invention includes a light guide plate 40, a thin plate 41, and a light source 42.

17 and 18, the light guide plate 40 includes a front surface 401 and a rear surface 402. The thin sheet 41 is disposed above the front surface 401 of the light guide plate 40. The thin sheet 41 has an upper surface 411, a lower surface 412, a lower side surface 413, and an upper side surface 414 opposite to the lower side surface 413, and defines a transverse direction T parallel to the lower side surface 413 and a longitudinal direction L of the vertical transverse direction T. . The thin sheet 41 defines a plurality of rectangular light emitting regions 44 on the lower surface 412. Each light emitting area 44 corresponds to a keycap 104 and is located below the corresponding keycap 104. Since the plurality of light emitting regions 44 are non-solid structures, they are indicated by dotted lines in FIG. 17.

As shown in FIG. 17, each light emitting region 44 has a first side 442 near the lower side 413, a second side 444 near the upper side 414, a third side 446 adjacent to the first side 442 and the second side 444, and an abutment. The first side 442 is opposite the second side 444 and the fourth side 448 opposite the third side 446. The chirped sheet 41 is in each light-exiting region 44 and includes a plurality of first microchirped structures 432 parallel to each other. The plurality of first microcapsule structures 432 in each light emitting region 44 are arranged next to one of the first side 442, the second side 444, the third side 446, and the fourth side 448 thereof. In the examples shown in FIG. 17 and FIG. 18, the plurality of first micro-capsule structures 432 in each light-emitting region 34 are arranged next to the first side 442 thereof.

As shown in FIG. 17, the light source 42 is used to emit light. The light enters the light guide plate 40. In a specific embodiment, the light source 42 may include a plurality of light emitting diode elements or organic light emitting diode elements, but the present invention is not limited thereto.

In a specific embodiment, as shown in the example shown in FIG. 17, the light source 42 is disposed adjacent to the side surface 406 of the light guide plate 40, and the light emitted by the light source 42 enters the light guide plate 40 from the side surface 406.

In another specific embodiment, the light guide plate 40 further has a plurality of through openings (not shown in the figure). In particular, the plurality of through openings are generally arranged along the center line of the vertical lower side surface 403. Each opening has its own light incident surface. The light source 42 includes a plurality of light emitting elements, and each light emitting element corresponds to an opening. Each light-emitting element is placed in its corresponding opening. The light emitted by each light emitting element enters the light guide plate 40 from the light incident surface of its corresponding opening.

In another specific embodiment, the light guide plate 40 further has a plurality of openings (not shown in the figure). In particular, the openings are formed on the back surface 402 of the light guide plate 40 and are close to the lower side 403 of the light guide plate 40. Each opening has its own light incident surface. The light source 42 includes a plurality of light emitting elements, and each light emitting element corresponds to an opening. Each light-emitting element is placed in its corresponding opening. The light emitted by each light emitting element enters the light guide plate 40 from the light incident surface of its corresponding opening.

In a specific embodiment, the cross section of each first micro- 稜鏡 structure 432 may be an inverted V-shaped protrusion, an inverted U-shaped protrusion, a V-shaped groove, a U-shaped groove, or other shapes of protrusions or grooves. groove.

As shown in FIG. 18, the light is guided by the light guide plate 40 and exits from the front surface 401, passes through the thin plate 41 and advances toward the plurality of keycaps 104. The light is directed toward the first portion of the plurality of first microcapsule structures 432 in each light emitting region 44 by the plurality of first microcapsule structures 432, and then directed to the keycap 104 corresponding to each light emitting region 44 . In FIG. 18, the dashed line represents the traveling route of the light originally not adjusted by the first microstructure 432. The rays traveling along this route are most likely to hit the eyes of the user, making the user's eyes uncomfortable. The first micro chirp structure 432 adjusts the transmission path of light using the principle of total reflection.

As shown in FIG. 17, the plurality of first micro chirp structures 432 of the adjacent light emitting regions 44 are connected together. That is, the plurality of first micro- 稜鏡 structures 432 distribute most of the area of the lower surface 412 of the 稜鏡 thin plate 41.

As shown in FIG. 18, the light guide plate 40 further includes a plurality of light turning structures 405. The plurality of light turning structures 405 are formed on the back surface 402 of the light guide plate 40 and are used to guide the light rays directed to the plurality of light turning structures 405 to the front surface 401 of the light guide plate 40. The plurality of light turning structures 405 may also be partially formed on the back surface 402 of the light guide plate 40, which guides light to advance toward the light-transmitting area 1042 of the corresponding keycap 104, as shown in FIG. 18. The plurality of light turning structures 405 may be formed by printing dot-like light-colored (eg, white) ink on the back surface 402 of the light guide plate 40, or may be formed with the light guide plate 40 integrally by using a microstructure or a coating method. However, the formation of the plurality of light turning structures 405 is not limited to the above process.

Further, as shown in FIG. 18, the backlight device 4 according to the third preferred embodiment of the present invention further includes a first light reflecting layer 45 and a light shielding layer 46. The first light reflecting layer 45 is formed on the upper surface 411 of the thin sheet 41 corresponding to areas other than the plurality of light emitting areas 44. The first light-reflecting layer 45 is used to reflect light rays directed toward the first light-reflecting layer 45. The light-shielding layer 46 is formed on the first light-reflecting layer 45 to block light from passing through a part of the light-reflecting layer 45.

In a specific embodiment, the first reflective layer 45 may be formed of a light-colored ink layer, for example, a white ink layer. The light shielding layer 46 may be formed of a dark ink layer, for example, a black ink layer.

Further, as shown in FIG. 18, the backlight device 4 according to the third preferred embodiment of the present invention further includes a second reflective layer 48. The second light-reflecting layer 48 is disposed below the back surface 402 of the light guide plate 40. The second light-reflecting layer 48 is used to reflect light rays directed toward the second light-reflecting layer 48. The second light reflecting layer 48 may be formed of a thin metal plate, but is not limited thereto.

In a specific embodiment, as shown in FIG. 19 and FIG. 20, the plurality of first micro- 稜鏡 structures 432 in each light-exiting area 44 extend in the lateral direction T and are arranged next to the first side 432 thereof. The cymbal sheet 41 is in each light-exiting area 44 and has a plurality of second micro-chirped structures 434 extending in the transverse direction T, a plurality of third micro-chirped structures 436 extending in the longitudinal direction L, and a plurality of longitudinally-oriented structures. L-extended fourth microfluorene structure 438. The plurality of second microcapsule structures 434 in each light emitting area 44 are arranged next to the second side 444 thereof. The plurality of third microcapsule structures 436 in each light emitting region 44 are arranged next to the third side 446 thereof. A plurality of fourth microcapsule structures 438 in each light emitting region 44 are arranged next to the fourth side 448 thereof. The light is directed to the second part of the plurality of second micro-capsule structures 434 in each light-emitting region 44. The second portion of the light is adjusted by the plurality of second micro-capsule structures 434, and then directed to the keycap 104 corresponding to each of the light-emitting regions 44. . The light is directed toward the third portion of the plurality of third micro-capsule structures 436 in each light-emitting region 44. The light is adjusted by the plurality of third micro-capsule structures 436, and then directed to the keycap 104 corresponding to each of the light-emitting regions 44. . The light is directed to the fourth part of the plurality of fourth micro-capsule structures 438 in each light-emitting region 44. The light is adjusted by the plurality of fourth micro-capsule structures 438, and then directed to the keycap 104 corresponding to each of the light-emitting regions 44. . Thereby, the backlight device 4 according to the third preferred embodiment of the present invention can reduce light leakage at the lower edge of the keycap 104 of the illuminated keyboard 1. The first micro chirped structure 432, the second micro chirped structure 434, the third micro chirped structure 436, and the fourth micro chirped structure 438 use the principle of refraction to adjust the transmission path of light.

Similarly, the cross-sections of the second micro- 稜鏡 structure 434, the third micro- 稜鏡 structure 436, and the fourth micro- 稜鏡 structure 438 can be inverted V-shaped protrusions, inverted U-shaped protrusions, V-shaped grooves, U-shaped Or other shaped protrusions or grooves.

Please refer to FIG. 21 and FIG. 22. FIG. 21 is a schematic diagram illustrating a modification of a backlight device 4 and a light-emitting keyboard 1 using the backlight device 4 according to a third preferred embodiment of the present invention in an element development view. FIG. 22 is a partial cross-sectional view of the illuminated keyboard 1 taken along line I-I in FIG. 21.

As shown in FIG. 21, a plurality of first micro-chirped structures 432 of adjacent light-exiting regions 44 are connected together. The plurality of first micro-condyle structures 432 are distributed over the lower surface 412 of the condyle sheet 41. The plurality of first microcapsule structures 432 may be arranged in parallel in the lateral direction T or the longitudinal direction L. In the example shown in FIG. 21, the plurality of first micro- 稜鏡 structures 432 are arranged in parallel along the lateral direction T. Elements in FIG. 21 having the same numbers as those in FIG. 17 have the same or similar structures and functions, and details are not described herein again.

The thin sheet 41 is in each light-exiting area 44 and has a hollow portion 418. There is a reserved portion between the hollow portion 418 in each light emitting area 44 and the first side 442, the second side 444, the third side 446, and the fourth side 448 of the light emitting area 44 449. The plurality of first micro chirped structures 432 in the reserved portion 449 of each light emitting area 44 are still retained.

As shown in FIG. 22, the light is guided by the light guide plate 40 and exits from the front surface 401, passes through the thin plate 41, and advances toward the plurality of keycaps 104. Part of the light directed to the plurality of first microcapsule structures 432 in the remaining portion 449 of each light emitting region 44 is adjusted by the plurality of first microcapsule structures 432, and then directed to the corresponding light emitting region 44. Keycap 104. In FIG. 22, a dashed line represents a traveling route of light originally not adjusted by the plurality of first microcapsule structures 432. The light traveling along this route is most likely to hit the user's eyes, making the user's eyes uncomfortable. The plurality of first micro chirped structures 432 use the principle of refraction to adjust the transmission path of light. There is a reserved portion between the hollow portion 418 in each light emitting area 44 and the first side 442, the second side 444, the third side 446, and the fourth side 448 of the light emitting area 44 The plurality of first microcapsule structures 432 remaining in 449 can reduce light leakage around the keycap 104 and further reduce halo around the keycap 104. Elements in FIG. 22 having the same numbers as those in FIG. 18 have the same or similar structures and functions, and will not be repeated here.

See Figure 23. FIG. 23 is a partial cross-sectional view of a modification of a backlight device 4 according to a third preferred embodiment of the present invention and a light-emitting keyboard 1 employing a modification of the backlight device 4 of the present invention. The section shown in FIG. 23 has the same definition as the line G-G in FIG. 17.

As shown in FIG. 23, the light guide plate 40 further includes a plurality of light turning structures 405. The plurality of light turning structures 405 are formed on the front surface 401 of the light guide plate 40 to scatter the light rays directed toward the plurality of light turning structures 405. The plurality of light turning structures 405 may also be partially formed on the front surface 401 of the light guide plate 40 as shown in FIG. 23. The plurality of light turning structures 405 may be formed by printing dot-like light-colored (eg, white) ink on the back surface 402 of the light guide plate 40, or may be formed with the light guide plate 40 integrally by using a microstructure or a coating method. However, the formation of the plurality of light turning structures 405 is not limited to the above process. The plurality of light turning structures 405 formed on the front surface 401 of the light guide plate 40 makes the overall light directed to the keycap 104 softer, but the brightness is not attenuated. Elements in FIG. 23 having the same numbers as those in FIG. 18 have the same or similar structures and functions, and details are not described herein again.

From the above detailed description of the present invention, it can be clearly understood that the backlight device according to the present invention has a micro-structure for adjusting light on the light emitting area of the corresponding keycap on the front side of the light guide plate. The light-emitting keyboard of the backlight device according to the present invention is used It can reduce light leakage at the lower edge of the keycap, avoid discomfort to the eyes of the user, and further reduce the halo around the keycap.

With the above detailed description of the preferred embodiments, it is hoped that the features and spirit of the present invention may be more clearly described, rather than limiting the aspects of the present invention with the preferred embodiments disclosed above. On the contrary, the intention is to cover various changes and equivalent arrangements within the scope of the patent scope of the present invention. Therefore, the aspect of the patent scope of the present invention should be explained in the broadest sense according to the above description, so that it covers all possible changes and equivalent arrangements.

Claims (16)

A backlight device for a light-emitting keyboard. The light-emitting keyboard includes a plurality of keycaps. The plurality of keycaps are disposed on the backlight device. The backlight device includes a light guide plate having a front surface, a back surface, and a bottom surface. A side surface and an upper side opposite to the lower side define a lateral direction parallel to the lower side and a longitudinal direction perpendicular to the lateral direction. The front side defines a plurality of rectangular light emitting areas, each of which corresponds to the light emitting area. A keycap located below its corresponding keycap and having a first side near one of the lower sides, a second side near one of the upper sides, a third side adjacent to the first side and one of the second sides And a fourth side adjacent to the first side, the second side, and the third side opposite to the third side, the light guide plate in each light emitting area and includes a plurality of first micro chirp structures parallel to each other, each of which emits light The plurality of first microcapsule structures in the area are arranged next to one of its first side, its second side, its third side, and its fourth side; and a light source for emitting a light, the light Injection In the light guide plate, the light is guided by the light guide plate and exits from the front, and advances toward the plurality of keycaps, and the light strikes a first part of the plurality of first microcapsule structures in each light emitting area. The light is adjusted by the plurality of first microcapsule structures, and then is directed to the keycap corresponding to the light emitting area. The backlight device according to claim 1, wherein the light guide plate further includes a plurality of light turning structures formed on the back surface to guide the light rays directed toward the plurality of light turning structures to the front side. The backlight device according to claim 1, further comprising a light-reflecting layer, which is disposed under the back surface to reflect the light rays directed to the light-reflecting layer. The backlight device according to claim 1, wherein a cross section of each of the first micro- 稜鏡 structures is selected from the group consisting of an inverted V-shaped protrusion, an inverted U-shaped protrusion, a V-shaped groove, and a U-shaped protrusion. One of the groups of grooves. The backlight device according to claim 4, wherein the plurality of first microcapsule structures in each light emitting area extend along the lateral direction and are arranged next to the first side thereof, and the light guide plate is in each light emitting area and Containing a plurality of second microcapsule structures extending along the lateral direction and arranged next to its second side, a plurality of third microcapsule structures extending along the longitudinal direction and arranged next to its third side, and a plurality of edges The fourth microcapsule structure extending in the longitudinal direction and arranged next to the fourth side thereof, the light rays are directed toward one of the plurality of second microcapsule structures in each light emitting area. The second micro chirp structure is adjusted, and then directed to the keycap corresponding to a light emitting area, and the light rays are directed to one of the plurality of third micro chirp structures in each light emitting area. The third micro-capsule structure is adjusted, and then directed to the keycap corresponding to a light-emitting area, and the light rays are directed to one of the plurality of fourth micro-capsule structures in each light-emitting area. Structural adjustment of a plurality of fourth microcapsules It is directed to the keycap corresponding to a light emitting area. The backlight device according to claim 4, further comprising: a light-shielding layer, which is disposed on the front surface and has a plurality of holes, each hole corresponds to a light emitting area, and the light-shielding layer is used to block the light from The other areas outside the plurality of light emitting areas are emitted. A backlight device for a light-emitting keyboard. The light-emitting keyboard includes a plurality of keycaps, and the plurality of keycaps are disposed on the backlight device. The backlight device includes a light guide plate having a front surface and a back surface; A thin sheet is disposed above the front surface of the light guide plate. The thin sheet has an upper surface, a lower surface, a lower side, and an upper side opposite to the lower side and defines a lateral direction parallel to the lower side and Perpendicular to one longitudinal direction of the transverse direction, the thin sheet defines a plurality of rectangular light emitting areas on the upper surface or the lower surface, and each light emitting area corresponds to a keycap and is located in the corresponding keycap. The lower side has a first side near one of the lower sides, a second side near one of the upper sides, a third side adjacent to the first side and the second side, and a first side adjacent to the second side and A fourth side opposite to the third side, the chirped sheet is in each light emitting area and includes a plurality of first micro chirp structures parallel to each other, and the plurality of first micro structures in each light emitting area The mirror structure is arranged next to one of its first side, its second side, its third side, and its fourth side; and a light source for emitting a light beam, the light beam is incident into the light guide plate, and the light beam is The light guide plate guides to exit from the front surface, passes through the cymbal sheet, and advances toward the plurality of keycaps, and the light rays are directed toward a first portion of the plurality of first micro cymbals structures in each light emitting area. The light is adjusted by the plurality of first microcapsule structures, and then is directed to the keycap corresponding to the light emitting area. The backlight device according to claim 7, wherein a cross section of each of the first micro- 稜鏡 structures is selected from the group consisting of an inverted V-shaped protrusion, an inverted U-shaped protrusion, a V-shaped groove, and a U-shaped protrusion. One of the groups of grooves. The backlight device according to claim 8, wherein the plurality of first microcapsule structures in the adjacent light emitting areas are connected together. The backlight device according to claim 9, wherein the plurality of first micro- 稜鏡 structures are distributed all over the upper surface or the entire lower surface, the 稜鏡 thin plate is in each light-emitting area and has a hollow portion, each light-emitting area There is a reserved part between the hollow part and the first side, the second side, the third side, and the fourth side of the light emitting area, and the reserved part of each light emitting area The plurality of first microcapsule structures in the portion are still retained. The backlight device according to claim 8, wherein the plurality of first micro-capsule structures in each light-exiting area extend along the lateral direction and are arranged next to the first side thereof, and the light guide plate is in each light-exiting area and Containing a plurality of second microcapsule structures extending along the lateral direction and arranged next to its second side, a plurality of third microcapsule structures extending along the longitudinal direction and arranged next to its third side, and a plurality of edges The fourth microcapsule structure extending in the longitudinal direction and arranged next to the fourth side thereof, the light rays are directed toward one of the plurality of second microcapsule structures in each light emitting area. The second micro chirp structure is adjusted, and then directed to the keycap corresponding to a light emitting area, and the light rays are directed to one of the plurality of third micro chirp structures in each light emitting area. The third micro-capsule structure is adjusted, and then directed to the keycap corresponding to a light-emitting area, and the light rays are directed to one of the plurality of fourth micro-capsule structures in each light-emitting area Structural adjustment of a plurality of fourth microcapsules It is directed to the keycap corresponding to a light emitting area. The backlight device according to claim 8, wherein the light guide plate further includes a plurality of light turning structures formed on the back surface to guide the light rays directed toward the plurality of light turning structures to the front surface. The backlight device according to claim 8, further comprising: a first light-reflecting layer formed on the upper surface except for the plurality of light-emitting areas to reflect the light rays directed toward the first light-reflecting layer. And a light-shielding layer is formed on the first light-reflecting layer to block the light from passing through a part of the light of the first light-reflecting layer. The backlight device according to claim 13, further comprising: a second light-reflecting layer disposed under the back surface to reflect the light rays directed toward the second light-reflecting layer. The backlight device according to claim 13, wherein the light guide plate further includes a plurality of light turning structures formed on the back surface to guide the light rays directed toward the plurality of light turning structures to the front side. The backlight device according to claim 13, wherein the light guide plate further includes a plurality of light turning structures formed on the front surface to scatter the light rays directed toward the plurality of light turning structures.