TW202326776A - Backlight module and luminous keyboard including the same - Google Patents

Abstract

A backlight module for use with a key module. The key module includes a plurality of keys and a support plate, wherein the plurality of keys are disposed on the support plate. The backlight module includes a lower substrate, a plurality of light sources, and a shielding structure. The lower substrate is disposed under the support plate, wherein there is an outer edge gap between the outer edge of the support plate and the lower substrate. The plurality of light sources are disposed between the support plate and the lower substrate. The shielding structure is disposed outside those of the plurality of light sources disposed on the perimeter to prevent the light provided by the plurality of light sources from emitting out of the outer edge gap.

Description

Luminous keyboard and its backlight module

The invention relates to a luminous keyboard and a backlight module thereof.

Keyboards are very important input devices for electronic products (especially computers), and the development of keyboards is closely related to the convenience of users. In order to operate the keyboard smoothly in a dim environment, light-emitting keyboards have gradually become the first choice of consumers. Wherein, the luminous keyboard usually uses a backlight module to supply light.

As shown in FIG. 1 , the conventional backlight module 80 usually uses an adhesive layer 61 to fix the bottom plate 10 , the spacer 60 , and the lower substrate 20 . However, since the adhesive layer 61 is mostly made of light-transmitting material, the light from the light source 30 may pass through the adhesive layer 61 and cause light leakage on the side of the backlight module 80 .

Therefore, how to improve the side light leakage of the backlight module is one of the key points in the design of the luminous keyboard.

The object of the present invention is to provide a luminous keyboard and its backlight module to improve the side light leakage of the backlight module.

The backlight module of the present invention is suitable for a key module. The key module includes a plurality of key units and a bottom plate, and the plurality of key units are arranged on the bottom plate. The backlight module includes a lower substrate, a plurality of light sources, and a shielding structure. The lower base plate is arranged under the base plate, and there is an outer edge gap between the outer edge of the base plate and the lower base plate. A plurality of light sources are arranged between the base plate and the lower base plate. The shielding structure is arranged on the outer side of the plurality of light sources, so as to prevent the light provided by the plurality of light sources from emitting from the outer edge gap.

In one embodiment, the lower substrate is a circuit board coupled with a plurality of light sources, and the backlight module further includes a light-shielding film disposed between the bottom plate and the plurality of light sources. Wherein, the light-shielding sheet extends outward from the part of the outer edge gap, and then extends upward and downward respectively to form a shielding structure to cover the outer edge gap.

In one embodiment, the edge of the shielding structure formed by extending the light-shielding sheet outwards beyond the outer edge gap and then extending downwards is further bent inwards to be below the lower substrate.

In one embodiment, the backlight module further includes a spacer disposed between the light-shielding sheet and the lower substrate, and located among the plurality of light sources distributed between the peripheral ones and the outer edge of the bottom substrate. Wherein, the first adhesive layer is arranged between the light-shielding sheet and the spacer, and the second adhesive layer is arranged between the spacer and the lower substrate.

In one embodiment, the lower substrate is a circuit board coupled with a plurality of light sources, and the backlight module further includes a light-shielding film disposed between the bottom plate and the plurality of light sources. Wherein, the light-shielding sheet is bent in the outer edge gap to form a shielding structure.

In one embodiment, the backlight module further includes a spacer disposed between the light-shielding sheet and the lower substrate, and located between the shielding structure and the outer edge of the bottom plate. Wherein, the first adhesive layer is arranged between the light-shielding sheet and the spacer, and the second adhesive layer is arranged between the spacer and the lower substrate.

In one embodiment, the lower substrate is a light reflection plate, and the backlight module further includes a circuit board, disposed between the bottom plate and the plurality of light sources, and coupled to the plurality of light sources. The circuit board includes a plurality of circuit board holes, and the vertical projections of the plurality of circuit board holes on the base plate overlap with the plurality of base plate holes. Wherein, the lower substrate extends toward the outer edge of the bottom plate to form a shielding structure to shield the outer edge gap.

In one embodiment, the backlight module further includes a spacer disposed between the circuit board and the lower substrate, and located among the plurality of light sources distributed between the peripheral ones and the outer edge of the bottom substrate. Wherein, the first adhesive layer is arranged between the circuit board and the spacer, and the second adhesive layer is arranged between the spacer and the lower substrate.

In one embodiment, the base plate has a plurality of base plate holes, the circuit board includes a plurality of circuit board holes, and vertical projections of the plurality of light sources and the plurality of circuit board holes on the base plate overlap with the plurality of base plate holes.

In one embodiment, the backlight module further includes a plurality of light guide sheets, which are respectively arranged on one side of one of the plurality of light sources. The vertical projection of the plurality of light guide sheets on the circuit board overlaps with the holes of the plurality of circuit boards. The light provided by the plurality of light sources They respectively enter from the side surfaces of the adjacent plurality of light guide sheets and exit from the top surface.

In one embodiment, the end edge of the shielding structure covers the outer edge of the bottom plate.

In one embodiment, the end edge of the shielding structure is bent inwards and extends between the bottom board and the circuit board.

In one embodiment, the lower substrate is a circuit board coupled with a plurality of light sources, and the upper and lower ends of the shielding structure are respectively connected to the bottom board and the lower substrate.

In one embodiment, the backlight module further includes a spacer disposed between the base plate and the lower substrate, and located between the shielding structure and the outer edge of the base plate. Wherein, the first adhesive layer is arranged between the bottom plate and the spacer, and the second adhesive layer is arranged between the spacer and the lower substrate.

In one embodiment, the backlight module further includes a light-shielding sheet disposed between the base plate and the spacer, and located above the plurality of light sources. Wherein, the shielding structure passes through the light-shielding sheet so that the upper and lower ends are respectively connected to the base plate and the lower base plate.

In one embodiment, the backlight module further includes a spacer disposed between the bottom plate and the lower substrate, and located among the plurality of light sources distributed between the peripheral ones and the outer edge of the bottom plate. Wherein, the spacer extends outwards from the part of the outer edge gap, and then extends upwards and downwards respectively to form a shielding structure to cover the outer edge gap.

In one embodiment, the backlight module further includes a light-shielding sheet disposed between the base plate and the spacer, and located above the plurality of light sources. Wherein, the first adhesive layer is arranged between the light-shielding sheet and the spacer, and the second adhesive layer is arranged between the spacer and the lower substrate.

In one embodiment, a portion of the bottom plate extends downward to form a shielding structure.

In one embodiment, the bottom plate extends beyond the outer edge gap, and then extends downward to form a shielding structure to cover the outer edge gap.

In one embodiment, the backlight module further includes a spacer disposed between the bottom plate and the lower substrate, and located among the plurality of light sources distributed between the peripheral ones and the outer edge of the bottom plate.

In one embodiment, a portion of the bottom plate extends downward to form a shielding structure that is distributed among the plurality of light sources between the peripheral ones and the spacers, and is connected to the lower substrate.

In one embodiment, the backlight module further includes a light-shielding sheet disposed between the base plate and the spacer, and located above the plurality of light sources.

In one embodiment, the backlight module further includes a spacer disposed between the bottom plate and the lower substrate, and is located among the plurality of light sources and distributed between the peripheral and the outer edge of the bottom plate, wherein the shielding structure passes through and fixes the bottom plate and the spacer , and the lower substrate.

In one embodiment, the backlight module further includes a light-shielding sheet disposed between the bottom plate and the spacer, and located above the plurality of light sources, wherein the shielding structure passes through and fixes the bottom plate, the light-shielding film, the spacer, and the lower substrate.

In one embodiment, the shielding structure is a fastener with a U-shaped cross-section, and the shielding structure can be fastened to the outer edge of the bottom plate to shield the outer edge gap, and the opposite edges of the shielding structure are respectively positioned under the bottom plate and the lower substrate.

In one embodiment, the backlight module further includes a spacer disposed between the bottom plate and the lower substrate, and located among the plurality of light sources distributed between the peripheral ones and the outer edge of the bottom plate. Wherein, the first adhesive layer is arranged between the light-shielding sheet and the spacer, and the second adhesive layer is arranged between the spacer and the lower substrate.

In one embodiment, the first adhesive layer and the second adhesive layer are opaque.

In one embodiment, the backlight module further includes a light-shielding sheet disposed between the bottom plate and the plurality of light sources.

In one embodiment, the bottom plate has a plurality of holes in the bottom plate, the light-shielding sheet has a plurality of light-transmitting parts, and the vertical projections of the light sources and the light-transmitting parts on the bottom plate overlap with the holes in the bottom plate.

In one embodiment, the backlight module further includes a plurality of light guide sheets, respectively disposed on one side of one of the plurality of light sources, the bottom plate has a plurality of holes in the bottom plate, the light-shielding sheet has a plurality of light-transmitting parts, a plurality of light-guiding sheets, and a plurality of light-transmitting parts. The vertical projection on the base plate overlaps with the plurality of holes in the base plate, and the light provided by the plurality of light sources enters from the side surfaces of the adjacent plurality of light guide sheets and exits from the top surface.

In one embodiment, the shielding structure includes a plurality of spacers, and the plurality of spacers are arranged between the base plate and the lower substrate from near to far with respect to those distributed in the periphery of the plurality of light sources, and are arranged staggered up and down between the bottom plate and the lower substrate, and are located in those distributed in the periphery of the plurality of light sources and the outer edge of the bottom plate.

In one embodiment, the first adhesive layer is disposed between one of the two adjacent plural spacers and the base plate, and the second adhesive layer is disposed between the other of the two adjacent plural spacers and the lower substrate between.

In one embodiment, the shielding structure includes a spacer, a plurality of first adhesive layers, and a plurality of second adhesive layers. The spacer is arranged between the base plate and the lower base plate, and is located between the peripheral ones distributed among the plurality of light sources and the outer edge of the base plate. The plurality of first adhesive layers are disposed between the spacer and the bottom plate, and there is a gap between the plurality of first adhesive layers. The plurality of second adhesive layers are disposed between the spacer and the lower substrate, and there are gaps between the plurality of second adhesive layers.

In one embodiment, the base plate has a plurality of base plate holes, and the vertical projections of the plurality of light sources on the base plate overlap with the plurality of base plate holes.

In one embodiment, the backlight module further includes a plurality of light guide sheets, respectively disposed on one side of one of the plurality of light sources, the bottom plate has a plurality of bottom plate holes, the vertical projections of the plurality of light guide sheets on the bottom plate overlap with the plurality of bottom plate holes, The light provided by the plurality of light sources respectively enters from the side surfaces of the adjacent plurality of light guide sheets and exits from the top surface.

The luminous keyboard of the present invention includes a key module and a backlight module.

In one embodiment, the backlight module includes a light-shielding film, a lower substrate, at least one light source, a spacer, and at least two adhesive layers. The light-shielding sheet includes at least one light-transmitting portion. The lower base plate and the shading sheet are set up and down oppositely. At least one light source is disposed between the light-shielding sheet and the lower substrate. The spacer is disposed between the light-shielding sheet and the lower substrate. At least two adhesive layers are arranged coplanarly between the light-shielding sheet and the lower substrate and parallel to the light-shielding sheet and the lower substrate. There is a gap between the at least two adhesive layers. One of the at least two adhesive layers is arranged adjacent to the light source. The other is located away from the light source and adjacent to the side wall of the spacer. Wherein, part of the light provided by at least one light source passes through the light-transmitting portion of the light-shielding sheet, and another part of the light provided by at least one light source passes through the adhesive layer adjacent to the light source, the gap between at least two adhesive layers, and the light source away from the light source. Another adhesive layer attenuated to reduce the side light leakage of the backlight module.

In an embodiment, the light source is located below the light-transmitting portion.

In one embodiment, the light source is not located under the light-transmitting portion, and the backlight module further includes a light guide sheet disposed between the light-shielding sheet and the lower substrate, wherein part of the light provided by the light source enters through the side wall of the light guide sheet and passes out of the light guide sheet. The top surface of the light sheet emits light through the light-transmitting part.

In one embodiment, the at least two adhesive layers are at least two first adhesive layers disposed between the light-shielding sheet and the spacer.

In one embodiment, the at least two adhesive layers are at least two second adhesive layers disposed between the spacer and the lower substrate.

In one embodiment, the lower substrate is a circuit board coupled with at least one light source.

In one embodiment, the lower substrate reflects part of the light provided by at least one light source.

In one embodiment, there is a gap between one of the at least two adhesive layers adjacent to the at least one light source and the at least one light source.

In one embodiment, the backlight module further includes a shielding structure, a part of the shielding structure is shielded outside the adhesive layer disposed away from the at least one light source, and there is a gap between the adhesive layer disposed away from the at least one light source and the portion of the shielding structure.

In one embodiment, at least one of the light shielding sheet and the lower substrate is bent to form a shielding structure, and the shielding structure is at least partially shielded outside the sidewall of the spacer.

In one embodiment, at least two adhesive layers do not overlap with the light-transmitting portion of the light-shielding sheet.

In one embodiment, the luminous keyboard includes a key module and a backlight module. The key module includes a plurality of key units and a base plate, and the plurality of key units are arranged on the base plate. The backlight module is arranged parallel to the bottom plate.

The invention provides a luminous keyboard and its backlight module to avoid light leakage from the side of the backlight module. The luminous keyboard of the present invention can be applied to a luminous keyboard of a notebook computer, but is not limited thereto. In the embodiment shown in FIG. 2 , the backlight module 801 of the present invention is suitable for the key module 700 , the key module 700 includes a plurality of key units 170 and a base plate 100 , and the plurality of key units 170 are disposed on the base plate 100 . Furthermore, the light-emitting keyboard 900 of the present invention includes a key module 700 and a backlight module 801 of the present invention. Wherein, the base plate 100 is used as a support for the plurality of key units 170, and the key units 170 are movably connected to the key caps and the base plate by means of a scissor-type support frame to support the movement of the key caps. The bottom plate 100 may have holes corresponding to the backlight module 801 to allow light to pass through, provide heat dissipation, or allow external fixing components (such as screws and pins) to be inserted.

Specifically, in the embodiment shown in FIG. 2 , the backlight module 801 includes a lower substrate 200 , a plurality of light sources 300 , and a shielding structure 400 . The lower substrate 200 is disposed under the base plate 100 , and the plurality of light sources 300 are disposed between the base plate 100 and the lower substrate 200 . In the embodiment shown in FIG. 3A , there is an outer edge gap 101 between the outer edge 120 of the bottom plate 100 and the lower substrate 200 . Seen from different angles, the outer edge gap 101 is the gap between the peripheral side portion of the base plate 100 and the lower base plate 200 . The shielding structure 400 is arranged on the outer side of the plurality of light sources 300 distributed on the periphery (that is, the light source distributed on the periphery), that is, on the side opposite to the outer edge 120 of the adjacent bottom plate 100, so as to prevent the light provided by the plurality of light sources 300 from coming out from outside. Edge gap 101 shoots out. Wherein, the peripheral area refers to the peripheral area 301 near the outer side of the backlight module 801 in the area where the plurality of light sources 300 are disposed (see FIG. 2 ). In other words, in different embodiments, the shielding structure 400 is disposed on one side of the plurality of light sources 300 distributed on the periphery toward the outer edge gap 101 , and may be located between the light source 300 and the outer edge gap 101 , in the outer edge gap 101 , or The outer side of the backlight module 801 as a whole.

More specifically, in the embodiment shown in FIG. 3A , the lower substrate 200 is a circuit board coupled with the light source 300 . The backlight module 801 further includes a light shielding sheet 500 disposed between the base plate 100 and the light source 300 . The light-shielding sheet 500 extends outward from the portion of the outer edge gap 101 , and then extends upward and downward respectively to form a shielding structure 400 to shield the outer edge gap 101 . Viewed from different angles, the shielding structure 400 is connected to the end 501 of the shading sheet 500 that extends out of the outer edge gap 101, and extends upward from the end 501 to form an upper shielding portion 410 to shield the shading sheet 500 and the bottom plate in the outer edge gap 101. The portion between 100 extends downward from the end portion 501 to form the lower shielding portion 420 to shield the portion between the light shielding sheet 500 and the lower substrate 200 in the outer edge gap 101 . In this way, the shielding structure 400 can prevent the light emitted by the light source 300 from being emitted from the outer edge gap 101 , that is, prevent the light from leaking from the side of the backlight module 801 . Wherein, based on considerations such as increasing the shielding effect or improving the mechanical strength, the end edge of the shielding structure 400 formed by extending the light shielding sheet 500 out of the outer edge gap 101 and extending downward, that is, the end edge of the lower shielding part 420, can be further extended to Inwardly bent to the bottom of the lower substrate 200 . That is, in this embodiment, the shielding structure 400 is extended from the light shielding sheet 500 , and the corresponding upper shielding portion 410 and lower shielding portion 420 are formed by embossing and bending techniques.

In the embodiment shown in FIG. 3A , the backlight module 801 further includes a spacer 600 disposed between the light-shielding sheet 500 and the lower substrate 200 , and located among the plurality of light sources 300 distributed between the periphery and the outer edge 120 of the bottom substrate 100 . Wherein, the first adhesive layer 610 is disposed between the light-shielding sheet 500 and the spacer 600 , the second adhesive layer 620 is disposed between the spacer 600 and the lower substrate 200 , and the third adhesive layer 630 is disposed between the bottom plate 100 and the light-shielding sheet 500 between. Furthermore, the common adhesive layer is made of light-transmitting material, and the light emitted by the light source may pass through the adhesive layer. The shielding structure 400 can prevent the light emitted by the light source 300 and passing through the first adhesive layer 610, the second adhesive layer 620, and the third adhesive layer 630 from further emitting from the outer edge gap 101 to the side of the backlight module 801 ( That is to prevent light leakage from the sides of the light-emitting keyboard). Wherein, the first adhesive layer 610 , the second adhesive layer 620 , and the third adhesive layer 630 can further use opaque materials to reduce the passage of light.

In the embodiment shown in FIG. 2 and FIG. 3A , the base plate 100 has a base plate hole 110 , and the light-shielding sheet 500 includes a light-transmitting portion 510 . Wherein, the light-shielding sheet 500 can be formed by printing ink on the film, and defines the light-transmitting portion 510 . The vertical projections of the plurality of light sources 300 and the plurality of transparent parts 510 on the base plate 100 overlap with the plurality of base plate holes 110 . In other words, each bottom plate hole 110 corresponds to one of the lower transparent parts 510 and one of the light sources 300 respectively. However, in different embodiments, the light source 300 may be used in conjunction with the light guide element, and may not be disposed directly under the hole 110 and the light-transmitting portion 510 on the bottom plate, based on considerations such as increasing the light emitting area and improving the uniformity of the light emitting.

More specifically, in the embodiment shown in FIG. 3B, the backlight module 801 further includes a plurality of light guide sheets 320, which are respectively arranged on one side of one of the plurality of light sources 300 (that is, each light guide sheet 320 is arranged on one side of the plurality of light sources). 300 on one side). The vertical projection of each light guide sheet 320 and the corresponding transparent portion 510 on the base plate 100 overlaps with the corresponding base plate hole 110 . In other words, each bottom plate hole 110 corresponds to one of the lower light-transmitting portions 510 and one of the light-guiding sheets 320 . The light provided by the light source 300 enters from the side surfaces 321 of the adjacent light guide sheet 320 and exits from the top surface 322 respectively.

In different embodiments, the shielding structure 400 can be changed according to considerations of usage or manufacturing. In the embodiment shown in FIG. 3C and FIG. 3D , the lower substrate 200 is a circuit board coupled with the light source 300 , and the backlight module 802 further includes a shading film 500 disposed between the bottom plate 100 and the light source 300 . Wherein, the light-shielding sheet 500 is bent to form the shielding structure 400 in the outer edge gap 101 using, for example, embossing and bending techniques.

In the embodiment shown in FIG. 3C , the light shielding sheet 500 is bent up and down in the outer edge gap 101 to form a shielding structure 400 (or called a first shielding structure) with a V-shaped/U-shaped section. Wherein, the shielding structure 400 (ie, the first shielding structure) has an inclined surface 430 facing the light source 300 . In this way, the shielding structure 400 (ie, the first shielding structure) can prevent the light emitted by the light source 300 from being emitted from the outer edge gap 101 , that is, prevent the light from leaking from the side of the backlight module 802 . Wherein, based on considerations such as increasing the shielding effect or improving the mechanical strength, the manner in which the light-shielding sheet 500 is bent to form the shielding structure 400 (ie, the first shielding structure) may vary. On the other hand, since the shielding structure 400 (that is, the first shielding structure) in this embodiment is mainly formed between the light shielding sheet 500 and the lower substrate 200, the part of the light shielding sheet 500 extending outward beyond the outer edge gap 101 can be further upward. The shielding structure 400 ′ (or called the second shielding structure) is extended to shield the part between the light-shielding sheet 500 and the bottom plate 100 in the outer edge gap 101 , preventing light from being emitted through the gap between the light-shielding sheet 500 and the bottom plate 100 . In this embodiment, the light shielding sheet 500 is bent on both sides of the light source 300 to form the shielding structure 400 (ie, the first shielding structure). However, in different embodiments, the light shielding sheet 500 can also be bent only at one side of the light source 300 to form the shielding structure 400 (ie, the first shielding structure).

In the embodiment shown in FIG. 3C , the backlight module 802 further includes a spacer 600 disposed between the light-shielding sheet 500 and the lower substrate 200 , and between the shielding structure 400 and the outer edge 120 of the base plate 100 . Wherein, the first adhesive layer 610 is disposed between the light-shielding sheet 500 and the spacer 600 , the second adhesive layer 620 is disposed between the spacer 600 and the lower substrate 200 , and the third adhesive layer 630 is disposed between the bottom plate 100 and the light-shielding sheet 500 between. Furthermore, the common adhesive layer is made of light-transmitting material, and the light emitted by the light source may pass through the adhesive layer. The shielding structure 400 can prevent the light emitted by the light source 300 from passing through the first adhesive layer 610 and the second adhesive layer 620 from being emitted from the outer edge gap 101 to the side of the backlight module 802, and the shielding structure 400' can prevent The light emitted by the light source 300 passes through the third adhesive layer 630 and exits from the outer edge gap 101 to the side of the backlight module 802 . Wherein, the first adhesive layer 610 , the second adhesive layer 620 , and the third adhesive layer 630 can further use opaque materials to reduce the passage of light.

In the embodiment shown in FIG. 3C , the base plate 100 has a base plate hole 110 , and the light-shielding sheet 500 has a light-transmitting portion 510 . Wherein, the light-shielding sheet 500 can be formed by printing ink on the film, and defines the light-transmitting portion 510 . The vertical projections of the plurality of light sources 300 and the plurality of transparent parts 510 on the base plate 100 overlap with the plurality of base plate holes 110 . In other words, each bottom plate hole 110 corresponds to one of the lower transparent parts 510 and one of the light sources 300 respectively. However, in different embodiments, the light source 300 may be used in conjunction with the light guide element, and may not be disposed directly under the hole 110 and the light-transmitting portion 510 on the bottom plate, based on considerations such as increasing the light emitting area and improving the uniformity of the light emitting.

More specifically, in the embodiment shown in FIG. 3D , the backlight module 802 further includes a plurality of light guide sheets 320 respectively disposed on one side of one of the plurality of light sources 300 , each light guide sheet 320 and the corresponding light-transmitting The vertical projection of the portion 510 on the base plate 100 overlaps with the corresponding base plate hole 110 . In other words, each bottom plate hole 110 corresponds to one of the lower light-transmitting portions 510 and one of the light-guiding sheets 320 . The light provided by the light source 300 enters from the side surfaces 321 of the adjacent light guide sheet 320 and exits from the top surface 322 respectively.

In different embodiments shown in FIGS. 4A to 5B , the lower substrate 200 is a light reflection plate for reflecting the light emitted from the light source 300 upward. The backlight module 803 further includes a circuit board 220 disposed between the base plate 100 and the plurality of light sources 300 and coupled to the plurality of light sources 300 . Wherein, the lower substrate 200 extends toward the outer edge 120 of the bottom plate 100 to form a shielding structure 400 to shield the outer edge gap 101 .

More specifically, in the embodiment shown in FIG. 4A , the lower substrate 200 extends toward the outer edge 120 of the base plate 100 to form a shielding structure 400 with a slope to shield the outer edge gap 101 . In this way, the shielding structure 400 can prevent the light emitted by the light source 300 from being emitted from the outer edge gap 101 , that is, prevent the light from leaking from the side of the backlight module 803 . Wherein, based on considerations such as increasing the shielding effect or improving the mechanical strength, the edge of the shielding structure 400 can be further bent to form the outer edge 120 of the cladding bottom plate 100 by using, for example, a bending technique.

In the embodiment shown in FIG. 4A , the backlight module 803 further includes a spacer 600 disposed between the circuit board 220 and the lower substrate 200 , and is located among the plurality of light sources 300 and distributed between the outer edge 120 of the base plate 100 . Wherein, the first adhesive layer 610 is disposed between the circuit board 220 and the spacer 600, the second adhesive layer 620 is disposed between the spacer 600 and the lower substrate 200, and the third adhesive layer 630 is disposed between the base plate 100 and the circuit board 220. between. Furthermore, the common adhesive layer is made of light-transmitting material, and the light emitted by the light source may pass through the adhesive layer. The shielding structure 400 can prevent the light emitted from the light source 300 and passing through the first adhesive layer 610 , the second adhesive layer 620 , and the third adhesive layer 630 from further emitting out of the side of the backlight module 803 through the outer edge gap 101 . Wherein, the first adhesive layer 610 , the second adhesive layer 620 , and the third adhesive layer 630 can further use opaque materials to reduce the passage of light.

In the embodiment shown in FIG. 4A , the bottom board 100 has a bottom board hole 110 , and the circuit board 220 includes a circuit board hole 221 . The circuit board hole 221 can be formed by, for example, punching. The vertical projections of the plurality of light sources 300 and the plurality of circuit board holes 221 on the base plate 100 overlap with the plurality of base plate holes 110 . In other words, each bottom plate hole 110 corresponds to a lower circuit board hole 221 and a light source 300 respectively. However, in different embodiments, the light source 300 may be used in conjunction with the light guide element for considerations such as increasing the light emitting area and improving the uniformity of the light emitting, and may not be disposed directly under the bottom plate hole 110 and the circuit board hole 221 .

More specifically, in the embodiment shown in FIG. 4B , the backlight module 803 further includes a plurality of light guide sheets 320 respectively disposed on one side of one of the plurality of light sources 300 , and each light guide sheet 320 is on the side of the circuit board 220 The vertical projection overlaps with the corresponding circuit board hole 221 . In other words, each bottom plate hole 110 corresponds to a lower circuit board hole 221 and a light guide sheet 320 respectively. The light provided by the light source 300 enters from the side surfaces 321 of the adjacent light guide sheet 320 and exits from the top surface 322 respectively.

The manner in which the lower substrate 200 extends toward the outer edge 120 of the base plate 100 to form the shielding structure 400 may vary according to manufacturing or usage considerations. In the embodiment shown in FIGS. 5A and 5B , the end edge of the shielding structure 400 is bent inwards and extends between the base plate 100 and the circuit board 220 . More specifically, the lower substrate 200 extends outward beyond the outer edge gap 101 , and then extends upward to form a shielding structure 400 to shield the outer edge gap 101 . In this way, the shielding structure 400 can prevent the light emitted by the light source 300 from being emitted from the outer edge gap 101 , that is, prevent the light from leaking from the side of the backlight module 803 . Wherein, based on considerations such as increasing the shielding effect or improving the mechanical strength, the edge of the shielding structure 400 can be further bent inward to extend between the bottom plate 100 and the circuit board 220 by using techniques such as embossing and bending.

In different embodiments shown in FIGS. 6A to 7B , the lower substrate 200 is a circuit board coupled with a plurality of light sources 300 , and the upper edge 401 and the lower edge 402 of the shielding structure 400 are respectively connected to the bottom plate 100 and the lower substrate 200 . More specifically, in the embodiment shown in FIG. 6A , the shielding structure 400 can be an electrical or non-electrical element such as a zero-resistance resistor, which is connected to the lower substrate 200 and abuts against the bottom substrate 100 by bonding, but This is not the limit. In this way, the shielding structure 400 can prevent the light emitted by the light source 300 from being emitted from the outer edge gap 101 , that is, prevent the light from leaking from the side of the backlight module 804 .

In the embodiment shown in FIG. 6A , the backlight module 804 further includes a spacer 600 disposed between the bottom plate 100 and the lower substrate 200 , and between the shielding structure 400 and the outer edge 120 of the bottom plate 100 . Wherein, the first adhesive layer 610 is disposed between the base plate 100 and the spacer 600 , and the second adhesive layer 620 is disposed between the spacer 600 and the lower substrate 200 . Furthermore, the common adhesive layer is made of light-transmitting material, and the light emitted by the light source may pass through the adhesive layer. The shielding structure 400 can prevent the light emitted by the light source 300 from passing through the first adhesive layer 610 and the second adhesive layer 620 from being emitted to the side of the backlight module 804 from the outer edge gap 101 . Wherein, the first adhesive layer 610 and the second adhesive layer 620 may further use opaque materials to reduce the passage of light.

In the embodiment shown in FIG. 6A , the bottom plate 100 has a bottom plate hole 110 , and the vertical projection of the light source 300 on the bottom plate 100 overlaps with the bottom plate hole 110 . In other words, each bottom plate hole 110 corresponds to a light source 300 below. However, in different embodiments, the light source 300 may be used in conjunction with the light guide element, and may not be disposed directly under the hole 110 on the bottom plate, based on considerations such as increasing the light emitting area and improving the uniformity of the light emitting.

More specifically, in the embodiment shown in FIG. 6B , the backlight module 804 further includes a plurality of light guide sheets 320 respectively disposed on one side of one of the plurality of light sources 300 . The vertical projection of each light guide sheet 320 on the base plate 100 overlaps with the corresponding base plate hole 110 . In other words, each bottom plate hole 110 corresponds to a lower light guide sheet 320 respectively. The light provided by the light source 300 enters from the side surfaces 321 of the adjacent light guide sheet 320 and exits from the top surface 322 respectively.

In the embodiment shown in FIGS. 7A and 7B , the backlight module 804 further includes a light shielding sheet 500 disposed between the base plate 100 and the spacer 600 , and located above the plurality of light sources 300 . Wherein, the shielding structure 400 passes through the light-shielding sheet 500 so that the upper end edge 401 and the lower end edge 402 are respectively connected to the base plate 100 and the lower base plate 200 .

In the embodiment shown in FIG. 7A , the spacer 600 is disposed between the light shielding sheet 500 and the lower substrate 200 , and is located between the shielding structure 400 and the outer edge 120 of the bottom plate 100 . Wherein, the first adhesive layer 610 is disposed between the light-shielding sheet 500 and the spacer 600 , the second adhesive layer 620 is disposed between the spacer 600 and the lower substrate 200 , and the third adhesive layer 630 is disposed between the base plate 100 and the light-shielding sheet 500 between. Furthermore, the common adhesive layer is made of light-transmitting material, and the light emitted by the light source may pass through the adhesive layer. The shielding structure 400 can prevent the light emitted by the light source 300 from passing through the first adhesive layer 610 , the second adhesive layer 620 , and the third adhesive layer 630 from the outer edge gap 101 to the side of the backlight module 804 . Wherein, the first adhesive layer 610 , the second adhesive layer 620 , and the third adhesive layer 630 can further use opaque materials to reduce the passage of light.

In the embodiment shown in FIG. 7A , the base plate 100 has a base plate hole 110 , and the light-shielding sheet 500 has a light-transmitting portion 510 . Wherein, the light-shielding sheet 500 can be formed by printing ink on the film, and defines the light-transmitting portion 510 . The vertical projections of the plurality of light sources 300 and the plurality of transparent parts 510 on the base plate 100 overlap with the plurality of base plate holes 110 . In other words, each hole 110 on the bottom plate corresponds to a light-transmitting portion 510 and a light source 300 below. However, in different embodiments, the light source 300 may be used in conjunction with the light guide element, and may not be disposed directly under the hole 110 and the light-transmitting portion 510 on the bottom plate, based on considerations such as increasing the light emitting area and improving the uniformity of the light emitting.

More specifically, in the embodiment shown in FIG. 7B , the backlight module 804 further includes a plurality of light guide sheets 320 respectively disposed on one side of one of the plurality of light sources 300 . The vertical projections of the light guide sheet 320 and the light-transmitting portion 510 on the base plate 100 overlap with the base plate hole 110 . In other words, each hole 110 on the bottom plate corresponds to a light-transmitting portion 510 and a light-guiding sheet 320 below. The light provided by the light source 300 enters from the side surfaces 321 of the adjacent light guide sheet 320 and exits from the top surface 322 respectively.

As shown in different embodiments in FIGS. 8A and 8B , the backlight module 805 includes a spacer 600 disposed between the base plate 100 and the lower base plate 200 , and is located among the plurality of light sources 300 distributed between the peripheral ones and the outer edge 120 of the base plate 100 . Wherein, the spacer 600 extends outward from the portion of the outer edge gap 101 , and then extends upward and downward respectively to form a shielding structure 400 to cover the outer edge gap 101 . Viewed from different angles, the shielding structure 400 is connected to the end portion 601 of the spacer 600 that extends out of the outer edge gap 101, and extends upward from the end portion 601 to form an upper shielding portion 410 to shield the middle spacer 600 and the bottom plate of the outer edge gap 101. The portion between 100 extends downward from the end portion 601 to form the lower shielding portion 420 to shield the portion between the spacer 600 and the lower substrate 200 in the outer edge gap 101 . That is, in this embodiment, the shielding structure 400 is extended from the spacer 600 , and the corresponding upper shielding portion 410 and lower shielding portion 420 are formed by embossing and bending techniques. In this way, the shielding structure 400 can prevent the light emitted by the light source 300 from being emitted from the outer edge gap 101 , that is, prevent the light from leaking from the side of the backlight module 805 .

In the embodiment shown in FIG. 8A , the backlight module 805 further includes a light-shielding film 500 disposed between the bottom plate 100 and the spacer 600 and above the plurality of light sources 300 . Wherein, the first adhesive layer 610 is disposed between the light-shielding sheet 500 and the spacer 600 , the second adhesive layer 620 is disposed between the spacer 600 and the lower substrate 200 , and the third adhesive layer 630 is disposed between the base plate 100 and the light-shielding sheet 500 between. Furthermore, the common adhesive layer is made of light-transmitting material, and the light emitted by the light source may pass through the adhesive layer. The shielding structure 400 can prevent the light emitted from the light source 300 and passing through the first adhesive layer 610 , the second adhesive layer 620 , and the third adhesive layer 630 from further emitting out of the side of the backlight module 805 through the outer edge gap 101 . Wherein, the first adhesive layer 610 , the second adhesive layer 620 , and the third adhesive layer 630 can further use opaque materials to reduce the passage of light.

In the embodiment shown in FIG. 8A , the base plate 100 has a base plate hole 110 , and the light-shielding sheet 500 has a light-transmitting portion 510 . Wherein, the light-shielding sheet 500 can be formed by printing ink on the film, and defines the light-transmitting portion 510 . The vertical projections of the plurality of light sources 300 and the plurality of transparent parts 510 on the base plate 100 overlap with the plurality of base plate holes 110 . In other words, each hole 110 on the bottom plate corresponds to a light-transmitting portion 510 and a light source 300 below. However, in different embodiments, the light source 300 may be used in conjunction with the light guide element, and may not be disposed directly under the hole 110 and the light-transmitting portion 510 on the bottom plate, based on considerations such as increasing the light emitting area and improving the uniformity of the light emitting.

More specifically, in the embodiment shown in FIG. 8B , the backlight module 805 further includes a plurality of light guide sheets 320 respectively disposed on one side of one of the plurality of light sources 300 . The vertical projection of each light guide sheet 320 and the corresponding transparent portion 510 on the base plate 100 overlaps with the corresponding base plate hole 110 . In other words, each hole 110 on the bottom plate corresponds to a light-transmitting portion 510 and a light-guiding sheet 320 below. The light provided by the light source 300 enters from the side surfaces 321 of the adjacent light guide sheet 320 and exits from the top surface 322 respectively.

In different embodiments shown in FIGS. 9A to 10B , a portion of the bottom plate 100 extends downward to form a shielding structure 400 . More specifically, in the embodiment shown in FIG. 9A , the bottom plate 100 extends beyond the outer edge gap 101 , and then extends downward to form a shielding structure 400 to cover the outer edge gap 101 . In this way, the shielding structure 400 can prevent the light emitted by the light source 300 from being emitted from the outer edge gap 101 , that is, prevent the light from leaking from the side of the backlight module 806 .

In the embodiment shown in FIG. 9A , the backlight module 806 further includes a spacer 600 disposed between the base plate 100 and the lower base plate 200 , and is located among the plurality of light sources 300 distributed between the periphery and the outer edge 120 of the base plate 100 . Wherein, the first adhesive layer 610 is disposed between the light-shielding sheet 500 and the spacer 600 , the second adhesive layer 620 is disposed between the spacer 600 and the lower substrate 200 , and the third adhesive layer 630 is disposed between the base plate 100 and the light-shielding sheet 500 between. Furthermore, the common adhesive layer is made of light-transmitting material, and the light emitted by the light source may pass through the adhesive layer. The shielding structure 400 can prevent the light emitted from the light source 300 and passing through the first adhesive layer 610 , the second adhesive layer 620 , and the third adhesive layer 630 from further emitting out of the side of the backlight module 806 from the outer edge gap 101 . Wherein, the first adhesive layer 610 , the second adhesive layer 620 , and the third adhesive layer 630 can further use opaque materials to reduce the passage of light.

In the embodiment shown in FIG. 9A , the base plate 100 has a base plate hole 110 , and the light-shielding sheet 500 has a light-transmitting portion 510 . Wherein, the light-shielding sheet 500 can be formed by printing ink on the film, and defines the light-transmitting portion 510 . The vertical projections of the plurality of light sources 300 and the plurality of transparent parts 510 on the base plate 100 overlap with the plurality of base plate holes 110 . In other words, each hole 110 on the bottom plate corresponds to a light-transmitting portion 510 and a light source 300 below. However, in different embodiments, the light source 300 may be used in conjunction with the light guide element, and may not be disposed directly under the hole 110 and the light-transmitting portion 510 on the bottom plate, based on considerations such as increasing the light emitting area and improving the uniformity of the light emitting.

More specifically, in the embodiment shown in FIG. 9B , the backlight module 806 further includes a plurality of light guide sheets 320 respectively disposed on one side of one of the plurality of light sources 300 . The vertical projection of each light guide sheet 320 and the corresponding transparent portion 510 on the base plate 100 overlaps with the corresponding base plate hole 110 . In other words, each hole 110 on the bottom plate corresponds to a light-transmitting portion 510 and a light-guiding sheet 320 below. The light provided by the light source 300 enters from the side surfaces 321 of the adjacent light guide sheet 320 and exits from the top surface 322 respectively.

The manner in which a portion of the bottom plate 100 extends downward to form the shielding structure 400 may vary depending on manufacturing or usage considerations. In the embodiment shown in FIGS. 10A and 10B , part of the bottom plate 100 extends downward to form a shielding structure 400 distributed among the plurality of light sources 300 between the periphery and the spacer 600 , and connected to the lower substrate 200 . More specifically, the shielding structure 400 in this embodiment is a downwardly bent tongue formed by the bottom plate 100 by stamping, for example. In this way, the shielding structure 400 can prevent the light emitted by the light source 300 from entering the first adhesive layer 610, the second adhesive layer 620, and the third adhesive layer 630, further preventing the light from being emitted from the outer edge gap 101, that is, preventing the light from being emitted from the backlight. The side of the module 806 leaks light. Wherein, the end edge of the shielding structure 400 is connected with the lower substrate 200 in a manner of, for example, interfering with or inserting.

11A and 11B as shown in different embodiments, the backlight module 807 includes a spacer 600 disposed between the base plate 100 and the lower base plate 200, and is located among the plurality of light sources 300 distributed between the periphery and the outer edge 120 of the base plate 100 . Wherein, the shielding structure 400 such as screws, rivets, hot melt glue, etc. passes through and fixes the bottom plate 100 , the spacer 600 , and the lower substrate 200 . In other words, in this embodiment, the fixing effect can be achieved without using an adhesive layer. In this way, not only is there no adhesive layer for light to pass through, but even if the bottom plate 100, the spacer 600, and the lower substrate 200 are not completely sealed, the shielding structure 400 located between the light source 300 and the outer edge gap 101 can also shield the light from the light source 300. The emitted light is emitted from the outer edge gap 101 , which prevents the light from leaking from the side of the backlight module 807 .

In the embodiment shown in FIGS. 11A and 11B , the backlight module 807 may further include a light-shielding film 500 disposed between the bottom plate 100 and the spacer 600 and above the plurality of light sources 300 . Wherein, the shielding structure 400 passes through and fixes the bottom plate 100 , the light shielding sheet 500 , the spacer 600 , and the lower substrate 200 .

In the embodiment shown in FIG. 11A , the base plate 100 has a base plate hole 110 , and the light-shielding sheet 500 has a light-transmitting portion 510 . Wherein, the light-shielding sheet 500 can be formed by printing ink on the film, and defines the light-transmitting portion 510 . The vertical projections of the plurality of light sources 300 and the plurality of transparent parts 510 on the base plate 100 overlap with the plurality of base plate holes 110 . In other words, each hole 110 on the bottom plate corresponds to a light-transmitting portion 510 and a light source 300 below. However, in different embodiments, the light source 300 may be used in conjunction with the light guide element, and may not be disposed directly under the hole 110 and the light-transmitting portion 510 on the bottom plate, based on considerations such as increasing the light emitting area and improving the uniformity of the light emitting.

More specifically, in the embodiment shown in FIG. 11B , the backlight module 807 further includes a plurality of light guide sheets 320 respectively disposed on one side of one of the plurality of light sources 300 . The vertical projection of each light guide sheet 320 and the corresponding transparent portion 510 on the base plate 100 overlaps with the corresponding base plate hole 110 . In other words, each hole 110 on the bottom plate corresponds to a light-transmitting portion 510 and a light-guiding sheet 320 below. The light provided by the light source 300 enters from the side surfaces 321 of the adjacent light guide sheet 320 and exits from the top surface 322 respectively.

12A and 12B show different embodiments, the shielding structure 400 is a fastener with a U-shaped cross section, the shielding structure 400 can be buckled on the outer edge 120 of the bottom plate 100 to shield the outer edge gap 101, and make the shielding structure 400 The opposite edges are respectively located on the base plate 100 and under the lower base plate 200 . Viewed from different angles, the upper part 441 of the shielding structure 400 is disposed on the upper surface of the base plate 100, extends outward beyond the outer edge 120 of the base plate 100 and then extends downward to form a middle portion 442, extends downward beyond the lower base plate 200 and then inwardly The lower part 443 is formed extending on the lower surface of the lower substrate 200, wherein the upper part 441 and the lower part 443 are respectively at least partially abutted against the upper surface of the bottom plate 100 and the lower surface of the lower substrate 200 by the rigidity of the shielding structure 400 itself (that is, the upper part 441 is abutted by the rigidity of the shielding structure 400 itself). The rigidity of the shielding structure 400 itself is at least partly abutted against the upper surface of the base plate 100, and the lower part 443 is at least partially abutted against the lower surface of the lower substrate 200 by the rigidity of the shielding structure 400 itself), so that the shielding structure 400 is buckled and fixed on The outer edge 120 of the bottom plate 100 . In this way, the shielding structure 400 can prevent the light emitted by the light source 300 from being emitted from the outer edge gap 101 , that is, prevent the light from leaking from the side of the backlight module 808 .

In the embodiment shown in FIG. 12A , the backlight module 808 further includes a spacer 600 disposed between the base plate 100 and the lower base plate 200 , and located among the plurality of light sources 300 distributed between the peripheral ones and the outer edge 120 of the base plate 100 . The backlight module 808 further includes a light-shielding sheet 500 disposed between the bottom plate 100 and the spacer 600, wherein the first adhesive layer 610 is disposed between the light-shielding sheet 500 and the spacer 600, and the second adhesive layer 620 is disposed on the spacer 600 and below. Between the substrates 200 , the third adhesive layer 630 is disposed between the base plate 100 and the light-shielding sheet 500 . Furthermore, the common adhesive layer is made of light-transmitting material, and the light emitted by the light source may pass through the adhesive layer. The shielding structure 400 can prevent light emitted from the light source 300 and passing through the first adhesive layer 610 , the second adhesive layer 620 , and the third adhesive layer 630 from further emitting out of the side of the backlight module 808 through the outer edge gap 101 . Wherein, the first adhesive layer 610 , the second adhesive layer 620 , and the third adhesive layer 630 can further use opaque materials to reduce the passage of light.

In the embodiment shown in FIG. 12A , the base plate 100 has a base plate hole 110 , and the light-shielding sheet 500 has a light-transmitting portion 510 . Wherein, the light-shielding sheet 500 can be formed by printing ink on the film, and defines the light-transmitting portion 510 . The vertical projections of the plurality of light sources 300 and the plurality of transparent parts 510 on the base plate 100 overlap with the plurality of base plate holes 110 . In other words, each hole 110 on the bottom plate corresponds to a light-transmitting portion 510 and a light source 300 below. However, in different embodiments, the light source 300 may be used in conjunction with the light guide element, and may not be disposed directly under the hole 110 and the light-transmitting portion 510 on the bottom plate, based on considerations such as increasing the light emitting area and improving the uniformity of the light emitting.

More specifically, in the embodiment shown in FIG. 12B , the backlight module 808 further includes a plurality of light guide sheets 320 respectively disposed on one side of one of the plurality of light sources 300 . The vertical projection of each light guide sheet 320 and the corresponding transparent portion 510 on the base plate 100 overlaps with the corresponding base plate hole 110 . In other words, each hole 110 on the bottom plate corresponds to a light-transmitting portion 510 and a light-guiding sheet 320 below. The light provided by the light source 300 enters from the side surfaces 321 of the adjacent light guide sheet 320 and exits from the top surface 322 respectively.

13A and 13B as shown in different embodiments, the shielding structure includes a plurality of spacers 600, and the plurality of spacers 600 are arranged between the base plate 100 and the lower base plate 200 from near to far and up and down with respect to the plurality of light sources 300 distributed on the periphery. and located between the plurality of light sources 300 distributed between the peripheral ones and the outer edge 120 of the bottom plate 100 . Furthermore, the spacer 600 is connected to the base plate 100 and the lower substrate 200 through the first adhesive layer 641 and the second adhesive layer 642 respectively. Since light travels in a straight line, and the first adhesive layer 641 and the second adhesive layer 642 are not on the same straight line relative to the light source 300, the shielding structure 400 can prevent the light emitted by the light source 300 from being emitted from the outer edge gap 101, that is Avoid light leakage from the side of the backlight module 809 . Wherein, the first adhesive layer 641 and the second adhesive layer 642 can further use opaque materials to reduce the passage of light. On the other hand, in addition to the attenuation of light traveling in the medium, it may also be attenuated due to refraction and partial reflection when entering different media. Therefore, providing gaps between the plurality of spacers 600 can promote the attenuation of light.

In the embodiment shown in FIG. 13A , the base plate 100 has base plate holes 110 , and the vertical projections of the plurality of light sources 300 on the base plate 100 overlap with the plurality of base plate holes 110 . In other words, each bottom plate hole 110 corresponds to a light source 300 below. However, in different embodiments, the light source 300 may be used in conjunction with the light guide element, and may not be disposed directly under the hole 110 on the bottom plate, based on considerations such as increasing the light emitting area and improving the uniformity of the light emitting.

More specifically, in the embodiment shown in FIG. 13B , the backlight module 809 further includes a plurality of light guide sheets 320 respectively disposed on one side of one of the plurality of light sources 300 . The vertical projection of each light guide sheet 320 and the corresponding transparent portion 510 on the base plate 100 overlaps with the corresponding base plate hole 110 . In other words, each bottom plate hole 110 corresponds to a lower light guide sheet 320 respectively. The light provided by the light source 300 enters from the side surfaces 321 of the adjacent light guide sheet 320 and exits from the top surface 322 respectively.

As shown in different embodiments in FIGS. 14A and 14B , the shielding structure includes a spacer 600 , a plurality of first adhesive layers 651 and a plurality of second adhesive layers 652 . The spacer 600 is disposed between the bottom plate 100 and the lower substrate 200 , and is located among the plurality of light sources 300 and distributed between the peripheral ones and the outer edge 120 of the bottom plate 100 . The plurality of first adhesive layers 651 are disposed between the spacer 600 and the bottom plate 100 , and there is a gap between the plurality of first adhesive layers 651 . The plurality of second adhesive layers 652 are disposed between the spacer 600 and the lower substrate 200 , and there is a gap between the plurality of second adhesive layers 652 . Furthermore, in addition to the attenuation of the light traveling in the medium, it may also be attenuated due to refraction and partial reflection when entering different media. Therefore, between the plurality of first adhesive layers 651 and the plurality of second adhesive layers 652 Gaps that facilitate attenuation of light. In this way, the shielding structure 400 can prevent the light emitted by the light source 300 from being emitted from the outer edge gap 101 , that is, prevent the light from leaking from the side of the backlight module 810 . Wherein, the first adhesive layer 651 and the second adhesive layer 652 can further use opaque materials to reduce the passage of light.

In the embodiment shown in FIG. 14A , the base plate 100 has base plate holes 110 , and the vertical projections of the plurality of light sources 300 on the base plate 100 overlap with the plurality of base plate holes 110 . In other words, each bottom plate hole 110 corresponds to a light source 300 below. However, in different embodiments, the light source 300 may be used in conjunction with the light guide element, and may not be disposed directly under the hole 110 on the bottom plate, based on considerations such as increasing the light emitting area and improving the uniformity of the light emitting.

More specifically, in the embodiment shown in FIG. 14B , the backlight module 810 further includes a plurality of light guide sheets 320 respectively disposed on one side of one of the plurality of light sources 300 . The vertical projection of each light guide sheet 320 and the corresponding transparent portion 510 on the base plate 100 overlaps with the corresponding base plate hole 110 . In other words, each bottom plate hole 110 corresponds to a lower light guide sheet 320 respectively. The light provided by the light source 300 enters from the side surfaces 321 of the adjacent light guide sheet 320 and exits from the top surface 322 respectively.

The present invention has been described by the above-mentioned related embodiments, but the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, modifications and equivalent arrangements included in the spirit and scope of the patent claims are included in the scope of the present invention.

100: Bottom plate 101: Outer edge clearance 110: Bottom plate hole 120: outer edge 170: Button unit 200: lower substrate 220: circuit board 221: circuit board hole 300: light source 301: Outer area 320: light guide sheet 321: side 322: top surface 400: Shielding structure (or the first shielding structure) 400': Shelter structure (or second shade structure) 401: upper edge 402: lower edge 410: Upper shielding part 420: lower shielding part 430: bevel 441: upper part 442: Central 443: lower part 500: shading film 501: end 510: Translucent part 600: spacer 601: end 610: the first adhesive layer 620: Second adhesive layer 630: The third adhesive layer 641: The first adhesive layer 642: Second adhesive layer 651: The first adhesive layer 652: Second adhesive layer 700: button module 801:Backlight module 802:Backlight module 803:Backlight module 804:Backlight module 805:Backlight module 806:Backlight module 807:Backlight module 808:Backlight module 809:Backlight module 810:Backlight module 900: Illuminated keyboard

Fig. 1 is a schematic diagram of a conventional technology.

Fig. 2 is a schematic diagram of an embodiment of the luminous keyboard of the present invention.

3A and 3B are schematic diagrams of the first embodiment of the backlight module of the present invention.

3C and 3D are schematic views of the second embodiment of the backlight module of the present invention.

4A and 4B are schematic diagrams of a third embodiment of the backlight module of the present invention.

5A and 5B are schematic diagrams of a fourth embodiment of the backlight module of the present invention.

6A and 6B are schematic diagrams of a fifth embodiment of the backlight module of the present invention.

7A and 7B are schematic views of the sixth embodiment of the backlight module of the present invention.

8A and 8B are schematic views of the seventh embodiment of the backlight module of the present invention.

9A and 9B are schematic views of the eighth embodiment of the backlight module of the present invention.

10A and 10B are schematic diagrams of the ninth embodiment of the backlight module of the present invention.

11A and 11B are schematic views of the tenth embodiment of the backlight module of the present invention.

12A and 12B are schematic diagrams of the eleventh embodiment of the backlight module of the present invention.

13A and 13B are schematic diagrams of the twelfth embodiment of the backlight module of the present invention.

14A and 14B are schematic diagrams of the thirteenth embodiment of the backlight module of the present invention.

(none)

100: Bottom plate

101: Outer edge clearance

110: Bottom plate hole

120: outer edge

200: lower substrate

300: light source

400: Shielding Structures

410: Upper shielding part

420: lower shielding part

500: shading film

501: end

510: Translucent part

600: spacer

610: the first adhesive layer

620: Second adhesive layer

630: The third adhesive layer

801:Backlight module

Claims (12)

A backlight module, comprising: A shading sheet, including at least one light-transmitting portion; The lower substrate is set up and down opposite to the shading sheet; At least one light source is arranged between the shading sheet and the lower substrate; a spacer disposed between the light-shielding sheet and the lower substrate; and At least two adhesive layers are coplanarly arranged between the light-shielding sheet and the lower substrate, and parallel to the light-shielding sheet and the lower substrate. There is a gap between the at least two adhesive layers, and one of the at least two adhesive layers is adjacent to The light source is disposed, and the other one of the at least two adhesive layers is away from the light source and disposed adjacent to the side wall of the spacer; Wherein, part of the light provided by the at least one light source passes through the light-transmitting portion of the shading sheet, and another part of the light provided by the at least one light source passes through the adhesive layer adjacent to the light source and between the at least two adhesive layers in sequence. The gap between them and the other adhesive layer away from the light source are attenuated to reduce the lateral light leakage of the backlight module. The backlight module as claimed in claim 1, wherein the light source is located below the light-transmitting portion. The backlight module according to claim 1, wherein the light source is not located under the light-transmitting part, and the backlight module further includes a light guide sheet disposed between the light-shielding sheet and the lower substrate, wherein the light source provides Part of the light enters through the sidewall of the light guide sheet, passes through the top surface of the light guide sheet and exits through the light-transmitting portion. The backlight module according to claim 1, wherein the at least two adhesive layers are at least two first adhesive layers disposed between the light-shielding sheet and the spacer. The backlight module according to claim 1, wherein the at least two adhesive layers are at least two second adhesive layers disposed between the spacer and the lower substrate. The backlight module as claimed in claim 1, wherein the lower substrate is a circuit board coupled with the at least one light source. The backlight module as claimed in claim 1, wherein the lower substrate reflects part of the light provided by the at least one light source. The backlight module as claimed in claim 1, wherein there is a gap between one of the at least two adhesive layers adjacent to the at least one light source and the at least one light source. The backlight module according to claim 1 further includes a shielding structure, a part of the shielding structure is shielded on the outside of the adhesive layer disposed away from the at least one light source, and the adhesive layer disposed away from the at least one light source is connected to the There is a gap between the portions of the shielding structure. The backlight module as claimed in claim 1, wherein at least one of the light shielding sheet and the lower substrate is bent to form a shielding structure, and the shielding structure is at least partially shielded outside the sidewall of the spacer. The backlight module as claimed in claim 1, wherein the at least two adhesive layers do not overlap with the light-transmitting portion of the light-shielding sheet. A luminous keyboard comprising: A button module, including a plurality of button units and a bottom plate, and the plurality of button units are arranged on the bottom plate; and The backlight module as claimed in any one of Claims 1 to 11 is arranged parallel to the bottom plate.

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