Backlit keyboard and its backlight module

Abstract

This invention discloses a backlight module suitable for button modules. The button module includes multiple button units and a base plate, with the button units disposed on the base plate. The backlight module includes a lower substrate, multiple light sources, and a shielding structure. The lower substrate is disposed below the base plate, and there is an outer edge gap between the outer edge of the base plate and the lower substrate. The multiple light sources are disposed between the base plate and the lower substrate. The shielding structure is disposed on the outer side of the multiple light sources to prevent light from the multiple light sources from escaping through the outer edge gap. This invention improves the side light leakage phenomenon of the backlight module by setting the shielding structure, which is located on the outer side of the multiple light sources, to prevent light from the multiple light sources from escaping through the outer edge gap between the outer edge of the base plate and the lower substrate.

Description

Technical Field

[0001] This invention relates to an illuminated keyboard and its backlight module, and more particularly to a backlight module and illuminated keyboard that improves side light leakage. Background Technology

[0002] Keyboards are a crucial input device for electronic products (especially computers), and their development is closely related to user convenience. To enable smooth operation in dimly lit environments, backlit keyboards have gradually become the preferred choice for consumers. These backlit keyboards typically use backlight modules to provide illumination.

[0003] like Figure 1 As shown, conventional backlight modules 80 typically use an adhesive layer 61 to fix the base plate 10, spacer 60, and lower substrate 20. However, since the adhesive layer 61 is mostly made of a light-transmitting material, the light emitted by the light source 30 may pass through the adhesive layer 61, resulting in light leakage on the side of the backlight module 80.

[0004] Therefore, improving the side light leakage phenomenon of the backlight module is one of the key design considerations for backlit keyboards. Summary of the Invention

[0005] The purpose of this invention is to provide a backlit keyboard and its backlight module to improve the side light leakage phenomenon of the backlight module.

[0006] To achieve the above objectives, the present invention proposes a backlight module suitable for a button module. The button module includes multiple button units and a base plate. The multiple button units are disposed on the base plate. The backlight module includes a lower substrate, multiple light sources, and a shielding structure. The lower substrate is disposed below the base plate, and an outer edge gap exists between the outer edge of the base plate and the lower substrate. The multiple light sources are disposed between the base plate and the lower substrate. The shielding structure is disposed on the outer side of the peripheral light sources to prevent light provided by the multiple light sources from escaping through the outer edge gap.

[0007] As an optional technical solution, the lower substrate is a circuit board coupled to the plurality of light sources, and the backlight module further includes a light shield. The light shield is disposed between the base plate and the plurality of light sources, wherein a portion of the light shield extends outward beyond the outer edge gap and then extends upward and downward respectively to form the shielding structure to shield the outer edge gap.

[0008] As an optional technical solution, the edge of the shielding structure formed by the light-shielding sheet extending outward from the outer edge gap and then extending downward further is bent inward to the bottom of the lower substrate.

[0009] As an optional technical solution, the backlight module further includes a spacer, a first adhesive layer and a second adhesive layer. The spacer is disposed between the light shield and the lower substrate, and the spacer is located between the peripheral light sources and the outer edge of the base plate. The first adhesive layer is disposed between the light shield and the spacer, and the second adhesive layer is disposed between the spacer and the lower substrate.

[0010] As an optional technical solution, the lower substrate is a circuit board coupled to the plurality of light sources, and the backlight module further includes a light shield, which is disposed between the base plate and the plurality of light sources. The light shield is bent in the outer edge gap to form the shielding structure.

[0011] As an optional technical solution, the backlight module further includes a spacer, a first adhesive layer and a second adhesive layer. The spacer is disposed between the light shield and the lower substrate, and the spacer is located between the outer edge of the shielding structure and the base plate. The first adhesive layer is disposed between the light shield and the spacer, and the second adhesive layer is disposed between the spacer and the lower substrate.

[0012] As an optional technical solution, the lower substrate is a light reflector, and the backlight module further includes a circuit board. The circuit board is disposed between the base plate and the plurality of light sources, and the circuit board is coupled to the plurality of light sources. The lower substrate extends toward the outer edge of the base plate to form the shielding structure to shield the outer edge gap.

[0013] As an optional technical solution, the backlight module further includes a spacer, a first adhesive layer and a second adhesive layer. The spacer is disposed between the circuit board and the lower substrate, and the spacer is located between the outermost of the plurality of light sources and the outer edge of the base plate. The first adhesive layer is disposed between the circuit board and the spacer, and the second adhesive layer is disposed between the spacer and the lower substrate.

[0014] As an optional technical solution, the base plate has multiple base plate holes, the circuit board includes multiple circuit board holes, and the multiple light sources and the multiple circuit board holes overlap with the multiple base plate holes in the vertical projection of the base plate.

[0015] As an optional technical solution, the backlight module further includes multiple light guide sheets, each light guide sheet being disposed on one side of one of the multiple light sources. The base plate has multiple base plate holes, and the circuit board includes multiple circuit board holes. The vertical projection of the multiple light guide sheets on the circuit board overlaps with the multiple circuit board holes. The light provided by the multiple light sources enters from the side of the adjacent multiple light guide sheets and exits from the top surface.

[0016] As an optional technical solution, the end edge of the shielding structure covers the outer edge of the base plate.

[0017] As an optional technical solution, the end edge of the shielding structure is bent inward and extends between the base plate and the circuit board.

[0018] As an optional technical solution, the lower substrate is a circuit board coupled to the plurality of light sources, and the upper and lower end edges of the shielding structure are respectively connected to the base plate and the lower substrate.

[0019] As an optional technical solution, the backlight module further includes a spacer, a first adhesive layer and a second adhesive layer. The spacer is disposed between the base plate and the lower substrate, and the spacer is located between the shielding structure and the outer edge of the base plate. The first adhesive layer is disposed between the base plate and the spacer, and the second adhesive layer is disposed between the spacer and the lower substrate.

[0020] As an optional technical solution, the backlight module further includes a light shield, which is disposed between the base plate and the spacer and is located above the plurality of light sources. The shielding structure passes through the light shield so that its upper and lower end edges are connected to the base plate and the lower substrate, respectively.

[0021] As an optional technical solution, the backlight module further includes a spacer, which is disposed between the base plate and the lower substrate. The spacer is located between the peripheral light sources and the outer edge of the base plate. Some of the spacers extend outward beyond the outer edge gap and then extend upward and downward to form the shielding structure to shield the outer edge gap.

[0022] As an optional technical solution, the backlight module further includes a light-shielding sheet, a first adhesive layer and a second adhesive layer. The light-shielding sheet is disposed between the base plate and the spacer, and the light-shielding sheet is located above the plurality of light sources. The first adhesive layer is disposed between the light-shielding sheet and the spacer, and the second adhesive layer is disposed between the spacer and the lower substrate.

[0023] As an optional technical solution, part of the base plate extends downward to form the shielding structure.

[0024] As an optional technical solution, part of the base plate extends out of the outer edge gap and then extends downward to form the shielding structure to shield the outer edge gap.

[0025] As an optional technical solution, the backlight module further includes a spacer, which is disposed between the base plate and the lower substrate, and the spacer is located between the peripheral light sources and the outer edge of the base plate.

[0026] As an optional technical solution, part of the base plate extends downward to form the shielding structure distributed among the multiple light sources between the outermost ones and the spacers, and the shielding structure is connected to the lower substrate.

[0027] As an optional technical solution, the backlight module further includes a light-shielding sheet disposed between the base plate and the spacer, and the light-shielding sheet is located above the plurality of light sources.

[0028] As an optional technical solution, the backlight module further includes a spacer disposed between the base plate and the lower substrate, and the spacer is located between the peripheral light sources and the outer edge of the base plate among the plurality of light sources, wherein the shielding structure passes through and fixes the base plate, the spacer and the lower substrate.

[0029] As an optional technical solution, the backlight module further includes a light shield, which is disposed between the base plate and the spacer and is located above the plurality of light sources. The shielding structure passes through and fixes the base plate, the light shield, the spacer and the lower substrate.

[0030] As an optional technical solution, the shielding structure is a fastener with a U-shaped cross section. The shielding structure is fastened to the outer edge of the base plate to shield the outer edge gap, and the opposite end edges of the shielding structure are respectively located on the base plate and under the lower substrate.

[0031] As an optional technical solution, the backlight module further includes a spacer, a first adhesive layer and a second adhesive layer. The spacer is disposed between the base plate and the lower substrate, and the spacer is located between the peripheral light sources and the outer edge of the base plate. The first adhesive layer is disposed between the light shield and the spacer, and the second adhesive layer is disposed between the spacer and the lower substrate.

[0032] As an optional technical solution, the first adhesive layer and the second adhesive layer are opaque adhesive layers.

[0033] As an optional technical solution, the backlight module further includes a light-shielding sheet disposed between the base plate and the plurality of light sources.

[0034] As an optional technical solution, the base plate has multiple base plate holes, the light shield has multiple light-transmitting parts, and the multiple light sources and the multiple light-transmitting parts have their vertical projections on the base plate overlapping with the multiple base plate holes.

[0035] As an optional technical solution, the backlight module further includes multiple light guide sheets, each light guide sheet being disposed on one side of one of the multiple light sources. The base plate has multiple base plate holes, and the light shield has multiple light-transmitting parts. The vertical projection of the multiple light guide sheets and the multiple light-transmitting parts on the base plate overlaps with the multiple base plate holes. The light provided by the multiple light sources enters from the side of the adjacent multiple light guide sheets and exits from the top surface.

[0036] As an optional technical solution, the shielding structure includes multiple spacers, which are arranged in a staggered manner between the base plate and the lower substrate, relative to the peripheral light sources. The multiple spacers are located between the peripheral light sources and the outer edge of the base plate.

[0037] As an optional technical solution, the backlight module also includes a first adhesive layer and a second adhesive layer. The first adhesive layer is disposed between one of the two adjacent plurality of spacers and the base plate, and the second adhesive layer is disposed between the other of the two adjacent plurality of spacers and the lower substrate.

[0038] As an optional technical solution, the shielding structure includes: a spacer, a plurality of first adhesive layers, and a plurality of second adhesive layers. The spacer is disposed between the base plate and the lower substrate, and the spacer is located between the peripheral portion of 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 base plate, and there are gaps 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.

[0039] As an optional technical solution, the base plate has multiple base plate holes, and the vertical projection of the multiple light sources on the base plate overlaps with the multiple base plate holes.

[0040] As an optional technical solution, the backlight module further includes multiple light guide sheets, each light guide sheet being disposed on one side of one of the multiple light sources. The base plate has multiple base plate holes, and the vertical projection of the multiple light guide sheets on the base plate overlaps with the multiple base plate holes. The light provided by the multiple light sources enters from the side of the adjacent multiple light guide sheets and exits from the top surface.

[0041] Furthermore, the present invention also proposes an illuminated keyboard, which includes a key module and the aforementioned backlight module. The key module includes multiple key units and a base plate, wherein the multiple key units are disposed on the base plate.

[0042] The backlight module of the present invention provides a shielding structure located on the outer side of the multiple light sources distributed among the peripheral ones, so as to prevent the light provided by the multiple light sources from escaping from the outer edge gap between the outer edge of the base plate and the lower substrate, thereby improving the side light leakage phenomenon of the backlight module.

[0043] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of a familiar technology.

[0045] Figure 2This is a schematic diagram of an embodiment of the illuminated keyboard of the present invention.

[0046] Figure 3A and Figure 3B This is a schematic diagram of the first embodiment of the backlight module of the present invention.

[0047] Figure 3C and Figure 3D This is a schematic diagram of a second embodiment of the backlight module of the present invention.

[0048] Figure 4A and Figure 4B This is a schematic diagram of the third embodiment of the backlight module of the present invention.

[0049] Figure 5A and Figure 5B This is a schematic diagram of the fourth embodiment of the backlight module of the present invention.

[0050] Figure 6A and Figure 6B This is a schematic diagram of the fifth embodiment of the backlight module of the present invention.

[0051] Figure 7A and Figure 7B This is a schematic diagram of the sixth embodiment of the backlight module of the present invention.

[0052] Figure 8A and Figure 8B This is a schematic diagram of the seventh embodiment of the backlight module of the present invention.

[0053] Figure 9A and Figure 9B This is a schematic diagram of the eighth embodiment of the backlight module of the present invention.

[0054] Figure 10A and Figure 10B This is a schematic diagram of the ninth embodiment of the backlight module of the present invention.

[0055] Figure 11A and Figure 11B This is a schematic diagram of the tenth embodiment of the backlight module of the present invention.

[0056] Figure 12A and Figure 12B This is a schematic diagram of the eleventh embodiment of the backlight module of the present invention.

[0057] Figure 13A and Figure 13B This is a schematic diagram of the twelfth embodiment of the backlight module of the present invention.

[0058] Figure 14A and Figure 14B This is a schematic diagram of the thirteenth embodiment of the backlight module of the present invention. Detailed Implementation

[0059] To provide a further understanding of the purpose, structure, features, and functions of the present invention, detailed descriptions are provided below with reference to specific embodiments.

[0060] This invention provides an illuminated keyboard and its backlight module to prevent light leakage from the sides of the backlight module. The illuminated keyboard of this invention can be applied to illuminated keyboards for notebook computers, but is not limited thereto. Figure 2 In the illustrated embodiment, the backlight module 801 of the present invention is applicable to the key module 700, which includes a plurality of key units 170 and a base plate 100, with the plurality of key units 170 disposed on the base plate 100. Further, the illuminated keyboard 900 of the present invention includes the key module 700 and the backlight module 801. The base plate 100 serves as a support for the plurality of key units 170, which are movably connected to the keycaps and the base plate via scissor-type support brackets to support keycap movement. The base plate 100 may have openings corresponding to the backlight module 801 to allow light to pass through, provide heat dissipation, or allow external fasteners (e.g., screws, pins) to be inserted.

[0061] Specifically, such as Figure 2 In the illustrated embodiment, 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 below the base plate 100, and the plurality of light sources 300 are disposed between the base plate 100 and the lower substrate 200. Figure 3A In the illustrated embodiment, an outer edge gap 101 exists between the outer edge 120 of the base plate 100 and the lower substrate 200. Viewed from different angles, the outer edge gap 101 is the void between a portion of the periphery of the base plate 100 and the lower substrate 200. A shielding structure 400 is disposed outside the peripheral portion of the plurality of light sources 300 (i.e., the peripherally distributed light sources), that is, on one side relative to the outer edge 120 of the adjacent base plate 100, to prevent light provided by the plurality of light sources 300 from escaping through the outer edge gap 101. Here, the peripheral portion refers to the peripheral region 301 of the region where the plurality of light sources 300 are disposed, located near the outer side of the backlight module 801 as a whole (see [link to relevant documentation]). Figure 2 In other words, in different embodiments, the shielding structure 400 is disposed among the plurality of light sources 300 distributed on the side of the periphery facing the outer edge gap 101. The shielding structure 400 may be located between the light source 300 and the outer edge gap 101, in the outer edge gap 101, or on the outside of the backlight module 801 as a whole.

[0062] More specifically, in cases such as Figure 3AIn the illustrated embodiment, the lower substrate 200 is a circuit board coupled to the light source 300. The backlight module 801 further includes a light-shielding sheet 500, which is disposed between the base plate 100 and the light source 300. The light-shielding sheet 500 extends outward beyond the outer edge gap 101, and then extends upward and downward 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 light-shielding sheet 500 extending outward beyond the outer edge gap 101, extends upward from the end 501 to form an upper shielding portion 410 to shield the portion between the light-shielding sheet 500 and the base plate 100 in the outer edge gap 101, and extends downward from the end 501 to form a lower shielding portion 420 to shield the portion between the light-shielding sheet 500 and the lower substrate 201 in the outer edge gap 101. Therefore, the shielding structure 400 prevents light emitted by the light source 300 from escaping through the outer edge gap 101, that is, avoids light leakage from the side of the backlight module 801. Specifically, based on considerations such as increasing the shielding effect or improving mechanical strength, the end edge of the shielding structure 400, which is formed by the light-shielding sheet 500 extending outward beyond the outer edge gap 101 and then downward, can be further bent inward to below the lower substrate 200. In other words, in this embodiment, the shielding structure 400 is formed by extending the light-shielding sheet 500, and the corresponding upper shielding portion 410 and lower shielding portion 420 are formed using embossing and bending techniques.

[0063] like Figure 3A In the illustrated embodiment, the backlight module 801 further includes a spacer 600, a first adhesive layer 610, a second adhesive layer 620, and a third adhesive layer 630. The spacer 600 is disposed between the light-shielding sheet 500 and the lower substrate 200, and is located among the plurality of light sources 300, distributed between the outermost ones and the outer edge 120 of the base plate 100. Specifically, 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. Furthermore, the adhesive layers are typically made of a light-transmitting material, allowing light emitted from the light source to pass through them. The shielding structure 400 prevents 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 escaping through the outer edge gap 101 to the side of the backlight module 801 (i.e., preventing light leakage from the side of the self-illuminating keyboard). The first adhesive layer 610, the second adhesive layer 620, and the third adhesive layer 630 can be made of opaque material to further reduce light transmission.

[0064] exist Figure 2 and Figure 3AIn the illustrated embodiment, the base plate 100 has base plate holes 110, and the light-shielding sheet 500 includes a light-transmitting portion 510. The light-shielding sheet 500 can be formed by printing ink on a film, defining the light-transmitting portion 510. The vertical projections of the plurality of light sources 300 and the plurality of light-transmitting portions 510 onto the base plate 100 overlap with the plurality of base plate holes 110. In other words, each base plate hole 110 corresponds to one light-transmitting portion 510 and one light source 300 below it. However, in different embodiments, based on considerations such as increasing the light-emitting area and improving light emission uniformity, the light source 300 can be used in conjunction with a light guide element and may not be positioned directly below the base plate holes 110 and the light-transmitting portions 510.

[0065] More specifically, such as Figure 3B In the illustrated embodiment, the backlight module 801 further includes a plurality of light guide sheets 320, each disposed on one side of one of the plurality of light sources 300 (i.e., each light guide sheet 320 is disposed on one side of one of the plurality of light sources 300). The vertical projection of each light guide sheet 320 and its corresponding light-transmitting portion 510 onto the base plate 100 overlaps with the corresponding base plate hole 110. In other words, each base plate hole 110 corresponds to a light-transmitting portion 510 and a light guide sheet 320 below it. The light provided by the light source 300 enters from the side surface 321 of the adjacent light guide sheet 320 and exits from the top surface 322.

[0066] In different embodiments, the shielding structure 400 may be varied depending on considerations such as use or manufacturing. For example... Figure 3C and Figure 3D In the embodiment shown, the lower substrate 200 is a circuit board coupled to the light source 300, and the backlight module 802 further includes a light-shielding sheet 500 disposed between the base plate 100 and the light source 300. The light-shielding sheet 500 is bent in the outer edge gap 101 using techniques such as embossing and bending to form a shielding structure 400.

[0067] like Figure 3CIn the illustrated embodiment, the light-shielding sheet 500 is bent sequentially up and down within the outer edge gap 101 to form a shielding structure 400 (or first shielding structure 400) with a V-shaped / U-shaped cross-section. The shielding structure 400 (i.e., the first shielding structure) has an inclined surface 430 facing the light source 300. This prevents light emitted from the light source 300 from escaping through the outer edge gap 101, thus preventing light leakage from the sides of the backlight module 802. The manner in which the light-shielding sheet 500 is bent to form the shielding structure 400 (i.e., the first shielding structure) can vary, for example, to increase the shielding effect or improve mechanical strength. On the other hand, since the shielding structure 400 (i.e., the first shielding structure) in this embodiment is mainly formed between the light-shielding sheet 500 and the lower substrate 200, the portion of the light-shielding sheet 500 extending outward beyond the outer edge gap 101 can further extend upward to form a shielding structure 400' (or a second shielding structure 400') to shield the portion between the light-shielding sheet 500 and the base plate 100 in the outer edge gap 101, preventing light from passing through the gap between the light-shielding sheet 500 and the base 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 (i.e., the first shielding structure). However, in different embodiments, the light-shielding sheet 500 may also be bent only on one side of the light source 300 to form the shielding structure 400 (i.e., the first shielding structure).

[0068] like Figure 3C In the illustrated embodiment, the backlight module 802 further includes a spacer 600, a first adhesive layer 610, a second adhesive layer 620, and a third adhesive layer 630. 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 base plate 100. Specifically, 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 100, and the third adhesive layer 630 is disposed between the base plate 100 and the light-shielding sheet 500. Furthermore, the adhesive layers are typically made of a light-transmitting material, allowing light emitted from the light source to pass through them. The shielding structure 400 prevents light emitted from the light source 300 from passing through the first adhesive layer 610 and the second adhesive layer 620 and exiting through the outer edge gap 101 to the outside of the backlight module 802. The shielding structure 400' prevents light emitted from the light source 300 from passing through the third adhesive layer 630 and exiting through the outer edge gap 101 to the outside of the backlight module 802. The first adhesive layer 610, the second adhesive layer 620, and the third adhesive layer 630 can be further made of opaque material to reduce light transmission.

[0069] like Figure 3CIn the illustrated embodiment, the base plate 100 has base plate holes 110, and the light-shielding sheet 500 has light-transmitting portions 510. The light-shielding sheet 500 can be formed by printing ink on a film, defining the light-transmitting portions 510. The vertical projections of the plurality of light sources 300 and the plurality of light-transmitting portions 510 onto the base plate 100 overlap with the plurality of base plate holes 110. In other words, each base plate hole 110 corresponds to one light-transmitting portion 510 and one light source 300 below it. However, in different embodiments, based on considerations such as increasing the light-emitting area and improving light emission uniformity, the light source 300 can be used in conjunction with a light guide element and may not be positioned directly below the base plate holes 110 and the light-transmitting portions 510.

[0070] More specifically, such as Figure 3D In the illustrated embodiment, the backlight module 802 further includes a plurality of light guide sheets 320. Each light guide sheet 320 is disposed on one side of one of the plurality of light sources 300. The vertical projection of each light guide sheet 320 and its corresponding light-transmitting portion 510 onto the base plate 100 overlaps with the corresponding base plate hole 110. In other words, each base plate hole 110 corresponds to a light-transmitting portion 510 and a light guide sheet 320 below it. The light provided by the light source 300 enters from the side surface 321 of the adjacent light guide sheet 320 and exits from the top surface 322.

[0071] like Figures 4A to 5B In the different embodiments shown, the lower substrate 200 is a light reflector, which reflects the light emitted from the light source 300 upwards. The backlight module 803 further includes a circuit board 220, which is disposed between the base plate 100 and the plurality of light sources 300, and is coupled to the plurality of light sources 300. The lower substrate 200 extends toward the outer edge 120 of the base plate 100 to form a shielding structure 400 to shield the outer edge gap 101.

[0072] More specifically, such as Figure 4A In the illustrated embodiment, the lower substrate 200 extends toward the outer edge 120 of the base plate 100 to form a beveled shielding structure 400 to shield the outer edge gap 101. Here, the shielding structure 400 prevents light emitted from the light source 300 from escaping through the outer edge gap 101, i.e., avoids light leakage from the side of the backlight module 803. Furthermore, based on considerations such as increasing the shielding effect or improving mechanical strength, the end edge of the shielding structure 400 can be further bent using, for example, a bending technique to form a shape that covers the outer edge 120 of the base plate 100.

[0073] like Figure 4AIn the illustrated embodiment, the backlight module 803 further includes a spacer 600, a first adhesive layer 610, a second adhesive layer 620, and a third adhesive layer 630. The spacer 600 is disposed between the circuit board 220 and the lower substrate 200, and is located among the plurality of light sources 300, distributed between the outermost ones and the outer edge 120 of the base plate 100. Specifically, 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. Furthermore, the adhesive layers are typically made of a light-transmitting material, allowing light emitted from the light source to pass through them. The shielding structure 400 prevents 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 escaping through the outer edge gap 101 to the side of the backlight module 803. The first adhesive layer 610, the second adhesive layer 620, and the third adhesive layer 630 may be made of opaque material to further reduce light transmission.

[0074] like Figure 4A In the illustrated embodiment, the base plate 100 has base plate holes 110, and the circuit board 220 includes circuit board holes 221. The circuit board holes 221 can be formed, for example, by a perforation method. The vertical projections of the plurality of light sources 300 and the plurality of circuit board holes 221 onto the base plate 100 overlap with the plurality of base plate holes 110. In other words, each base plate hole 110 corresponds to one circuit board hole 221 and one light source 300 below it. However, in different embodiments, based on considerations such as increasing the light-emitting area and improving light emission uniformity, the light source 300 can be used in conjunction with a light guide element and may not be positioned directly below the base plate holes 110 and the circuit board holes 221.

[0075] More specifically, such as Figure 4B In the illustrated embodiment, the backlight module 803 further includes a plurality of light guide sheets 320, each light guide sheet 320 being disposed on one side of one of the plurality of light sources 300. The vertical projection of each light guide sheet 320 onto the circuit board 220 overlaps with a corresponding circuit board hole 221. In other words, each bottom plate hole 110 corresponds to one circuit board hole 221 and one light guide sheet 320 below it. The light provided by the light source 300 enters from the side surface 321 of the adjacent light guide sheet 320 and exits from the top surface 322.

[0076] 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 can vary depending on manufacturing or usage considerations. For example... Figure 5A and 5BIn the illustrated embodiment, the end edge of the shielding structure 400 is bent inward and extends between the base plate 100 and the circuit board 220. More specifically, the lower substrate 200 extends outward to form an outer edge gap 101, and then extends upward to form the shielding structure 400 to shield the outer edge gap 101. In this way, the shielding structure 400 can prevent light emitted by the light source 300 from escaping through the outer edge gap 101, that is, prevent light leakage from the side of the backlight module 803. Furthermore, based on considerations such as increasing the shielding effect or improving mechanical strength, the end edge of the shielding structure 400 can be further bent inward and extends between the base plate 100 and the circuit board 220 using techniques such as embossing and bending.

[0077] like Figures 6A to 7B In the different embodiments shown, the lower substrate 200 is a circuit board coupled to a plurality of light sources 300, and the upper edge 401 and lower edge 402 of the shielding structure 400 are respectively connected to the base plate 100 and the lower substrate 200. More specifically, as Figure 6A In the illustrated embodiment, the shielding structure 400 can be an electrically or non-electrically conductive component, such as a zero-resistance resistor, which is connected to the lower substrate 200 and abuts against the base plate 100 by means of a bonding process, but is not limited thereto. In this way, the shielding structure 400 can prevent the light emitted by the light source 300 from being emitted through the outer edge gap 101, that is, prevent light leakage from the side of the backlight module 804.

[0078] like Figure 6A In the illustrated embodiment, the backlight module 804 further includes a spacer 600, a first adhesive layer 610, and a second adhesive layer 620. The spacer 600 is disposed between the base plate 100 and the lower substrate 200, and is located between the shielding structure 400 and the outer edge 120 of the base plate 100. 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, adhesive layers are typically made of translucent material, and light emitted from the light source may pass through them. The shielding structure 400 prevents light emitted from the light source 300 from passing through the first adhesive layer 610 and the second adhesive layer 620 and exiting through the outer edge gap 101 to the side of the backlight module 804. The first adhesive layer 610 and the second adhesive layer 620 may further be made of opaque material to reduce light transmission.

[0079] like Figure 6A In the illustrated embodiment, the base plate 100 has base plate holes 110, and the vertical projection of the light source 300 onto the base plate 100 overlaps with the base plate holes 110. In other words, each base plate hole 110 corresponds to one light source 300 below it. However, in different embodiments, based on considerations such as increasing the light-emitting area and improving light emission uniformity, the light source 300 may be used in conjunction with a light guide element and may not be positioned directly below the base plate holes 110.

[0080] More specifically, such as Figure 6B In the illustrated embodiment, the backlight module 804 further includes a plurality of light guide sheets 320, each light guide sheet 320 being disposed on one side of one of the plurality of light sources 300. The vertical projection of each light guide sheet 320 onto the base plate 100 overlaps with a corresponding base plate hole 110. In other words, each base plate hole 110 corresponds to one of the light guide sheets 320 below it. The light provided by the light source 300 enters from the side surface 321 of the adjacent light guide sheet 320 and exits from the top surface 322.

[0081] like Figure 7A and 7B In the embodiment shown, the backlight module 804 further includes a light-shielding sheet 500 disposed between the base plate 100 and the spacer 600, and the light-shielding sheet 500 is located above the plurality of light sources 300. The shielding structure 400 passes through the light-shielding sheet 500 to connect the upper edge 401 and the lower edge 402 to the base plate 100 and the lower substrate 200, respectively.

[0082] like Figure 7A In the illustrated embodiment, the spacer 600 is disposed between the light-shielding sheet 500 and the lower substrate 200, and the spacer 600 is located between the outer edge 120 of the shielding structure 400 and the base plate 100. Specifically, a first adhesive layer 610 is disposed between the light-shielding sheet 500 and the spacer 600, a second adhesive layer 620 is disposed between the spacer 600 and the lower substrate 200, and a third adhesive layer 630 is disposed between the base plate 100 and the light-shielding sheet 500. Furthermore, adhesive layers are typically made of a light-transmitting material, allowing light emitted from the light source to pass through them. The shielding structure 400 prevents light emitted from the light source 300 from passing through the first adhesive layer 610, the second adhesive layer 620, and the third adhesive layer 630 and exiting through the outer edge gap 101 to the side of the backlight module 804. The first adhesive layer 610, the second adhesive layer 620, and the third adhesive layer 630 may be made of opaque materials to reduce the transmission of light.

[0083] like Figure 7A In the illustrated embodiment, the base plate 100 has base plate holes 110, and the light-shielding sheet 500 has light-transmitting portions 510. The light-shielding sheet 500 can be formed by printing ink on a film, defining the light-transmitting portions 510. The vertical projections of the plurality of light sources 300 and the plurality of light-transmitting portions 510 onto the base plate 100 overlap with the plurality of base plate holes 110. In other words, each base plate hole 110 corresponds to one light-transmitting portion 510 and one light source 300 below it. However, in different embodiments, based on considerations such as increasing the light-emitting area and improving light emission uniformity, the light source 300 can be used in conjunction with a light guide element and may not be positioned directly below the base plate holes 110 and the light-transmitting portions 510.

[0084] More specifically, such as Figure 7B In the illustrated embodiment, the backlight module 804 further includes a plurality of light guide sheets 320, each light guide sheet 320 being disposed on one side of one of the plurality of light sources 300. The vertical projection of each light guide sheet 320 and its corresponding light-transmitting portion 510 onto the base plate 100 overlaps with the corresponding base plate hole 110. In other words, each base plate hole 110 corresponds to a light-transmitting portion 510 and a light guide sheet 320 below it. The light provided by the light source 300 enters from the side surface 321 of the adjacent light guide sheet 320 and exits from the top surface 322.

[0085] like Figure 8A and 8B In the different embodiments shown, the backlight module 805 includes a spacer 600 disposed between the base plate 100 and the lower substrate 200, and the spacer 600 is located between the outermost of the plurality of light sources 300 and the outer edge 120 of the base plate 100. The spacer 600 extends outward beyond the outer edge gap 101, and then extends upward and downward 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 601 of the spacer 600 extending outward beyond the outer edge gap 101, extending upward from the end 601 to form an upper shielding portion 410 to shield the portion between the spacer 600 and the base plate 100 in the outer edge gap 101, and extending downward from the end 601 to form a lower shielding portion 420 to shield the portion between the spacer 600 and the lower substrate 201 in the outer edge gap 101. That is, in this embodiment, the shielding structure 400 is formed by extending 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 through the outer edge gap 101, that is, prevent light leakage from the side of the backlight module 805.

[0086] like Figure 8AIn the illustrated embodiment, the backlight module 805 further includes a light-shielding sheet 500, a first adhesive layer 610, a second adhesive layer 620, and a third adhesive layer 630. The light-shielding sheet 500 is disposed between the base plate 100 and the spacer 600, and is located above the plurality of light sources 300. Specifically, 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. Furthermore, adhesive layers are typically made of a light-transmitting material, and light emitted from the light source may pass through the adhesive layer. The shielding structure 400 prevents 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 exiting through the outer edge gap 101 to the side of the backlight module 805. The first adhesive layer 610, the second adhesive layer 620, and the third adhesive layer 630 may be made of opaque materials to reduce the transmission of light.

[0087] like Figure 8A In the illustrated embodiment, the base plate 100 has base plate holes 110, and the light-shielding sheet 500 has light-transmitting portions 510. The light-shielding sheet 500 can be formed by printing ink on a film, defining the light-transmitting portions 510. The vertical projections of the plurality of light sources 300 and the plurality of light-transmitting portions 510 onto the base plate 100 overlap with the plurality of base plate holes 110. In other words, each base plate hole 110 corresponds to one light-transmitting portion 510 and one light source 300 below it. However, in different embodiments, based on considerations such as increasing the light-emitting area and improving light emission uniformity, the light source 300 can be used in conjunction with a light guide element and may not be positioned directly below the base plate holes 110 and the light-transmitting portions 510.

[0088] More specifically, such as Figure 8B In the illustrated embodiment, the backlight module 805 further includes a plurality of light guide sheets 320, each light guide sheet 320 being disposed on one side of one of the plurality of light sources 300. The vertical projection of each light guide sheet 320 and its corresponding light-transmitting portion 510 onto the base plate 100 overlaps with the corresponding base plate hole 110. In other words, each base plate hole 110 corresponds to a light-transmitting portion 510 and a light guide sheet 320 below it. The light provided by the light source 300 enters from the side surface 321 of the adjacent light guide sheet 320 and exits from the top surface 322.

[0089] like Figures 9A to 10B In the different embodiments shown, a portion of the base plate 100 extends downward to form a shielding structure 400. More specifically, as... Figure 9AIn the embodiment shown, the base plate 100 extends out of the outer edge gap 101 and then extends downward 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 light leakage from the side of the backlight module 806.

[0090] like Figure 9A In the illustrated embodiment, the backlight module 806 further includes a spacer 600, a first adhesive layer 610, a second adhesive layer 620, and a third adhesive layer 630. The spacer 600 is disposed between the base plate 100 and the lower substrate 200, and is located among the plurality of light sources 300, distributed between the outermost ones and the outer edge 120 of the base plate 100. Specifically, 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. Furthermore, the adhesive layers are typically made of a light-transmitting material, allowing light emitted from the light source to pass through them. The shielding structure 400 prevents 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 escaping through the outer edge gap 101 to the side of the backlight module 806. The first adhesive layer 610, the second adhesive layer 620, and the third adhesive layer 630 may be made of opaque material to further reduce light transmission.

[0091] like Figure 9A In the illustrated embodiment, the base plate 100 has base plate holes 110, and the light-shielding sheet 500 has light-transmitting portions 510. The light-shielding sheet 500 can be formed by printing ink on a film, defining the light-transmitting portions 510. The vertical projections of the plurality of light sources 300 and the plurality of light-transmitting portions 510 onto the base plate 100 overlap with the plurality of base plate holes 110. In other words, each base plate hole 110 corresponds to one light-transmitting portion 510 and one light source 300 below it. However, in different embodiments, based on considerations such as increasing the light-emitting area and improving light emission uniformity, the light source 300 can be used in conjunction with a light guide element and may not be positioned directly below the base plate holes 110 and the light-transmitting portions 510.

[0092] More specifically, such as Figure 9B In the illustrated embodiment, the backlight module 806 further includes a plurality of light guide sheets 320, each light guide sheet 320 being disposed on one side of one of the plurality of light sources 300. The vertical projection of each light guide sheet 320 and its corresponding light-transmitting portion 510 onto the base plate 100 overlaps with the corresponding base plate hole 110. In other words, each base plate hole 110 corresponds to a light-transmitting portion 510 and a light guide sheet 320 below it. The light provided by the light source 300 enters from the side surface 321 of the adjacent light guide sheet 320 and exits from the top surface 322.

[0093] The manner in which the base plate 100 extends downward to form the shielding structure 400 can vary depending on manufacturing or usage considerations. For example... Figure 10A and 10B In the illustrated embodiment, a portion of the base plate 100 extends downward to form a shielding structure 400 distributed among the peripheral light sources 300 and spacers 600, and the shielding structure 400 is connected to the lower substrate 200. More specifically, in this embodiment, the shielding structure 400 is a downwardly bent tongue formed by the base plate 100 using, for example, stamping. In this way, the shielding structure 400 prevents light emitted from the light sources 300 from entering the first adhesive layer 610, the second adhesive layer 620, and the third adhesive layer 630, and further prevents light from escaping from the outer edge gap 101, i.e., avoids light leakage from the sides of the backlight module 806. The end edges of the shielding structure 400 are connected to the lower substrate 200 by, for example, abutting or inserting.

[0094] like Figure 11A and 11B In the different embodiments shown, the backlight module 807 includes a spacer 600 disposed between the base plate 100 and the lower substrate 200, and the spacer 600 is located between the outermost of the plurality of light sources 300 and the outer edge 120 of the base plate 100. A shielding structure 400, such as a screw, rivet, or hot melt adhesive, passes through and fixes the base plate 100, the spacer 600, and the lower substrate 200. In other words, in this embodiment, a fixing effect is achieved without the need for an adhesive layer. Therefore, not only is there no adhesive layer for light to pass through, but even if the base 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 still block the light emitted by the light source 300 from escaping through the outer edge gap 101, thus preventing light leakage from the sides of the backlight module 807.

[0095] like Figure 11A and 11B In the embodiment shown, the backlight module 807 may further include a light-shielding sheet 500 disposed between the base plate 100 and the spacer 600, and the light-shielding sheet 500 is located above the plurality of light sources 300. The shielding structure 400 passes through and fixes the base plate 100, the light-shielding sheet 500, the spacer 600 and the lower substrate 200.

[0096] like Figure 11AIn the illustrated embodiment, the base plate 100 has base plate holes 110, and the light-shielding sheet 500 has light-transmitting portions 510. The light-shielding sheet 500 can be formed by printing ink on a film, defining the light-transmitting portions 510. The vertical projections of the plurality of light sources 300 and the plurality of light-transmitting portions 510 onto the base plate 100 overlap with the plurality of base plate holes 110. In other words, each base plate hole 110 corresponds to one light-transmitting portion 510 and one light source 300 below it. However, in different embodiments, based on considerations such as increasing the light-emitting area and improving light emission uniformity, the light source 300 can be used in conjunction with a light guide element and may not be positioned directly below the base plate holes 110 and the light-transmitting portions 510.

[0097] More specifically, such as Figure 11B In the illustrated embodiment, the backlight module 807 further includes a plurality of light guide sheets 320, each light guide sheet 320 being disposed on one side of one of the plurality of light sources 300. The vertical projection of each light guide sheet 320 and its corresponding light-transmitting portion 510 onto the base plate 100 overlaps with the corresponding base plate hole 110. In other words, each base plate hole 110 corresponds to a light-transmitting portion 510 and a light guide sheet 320 below it. The light provided by the light source 300 enters from the side surface 321 of the adjacent light guide sheet 320 and exits from the top surface 322.

[0098] like Figure 12A and 12B In the different embodiments shown, the shielding structure 400 is a fastener with a U-shaped cross section. The shielding structure 400 can be fastened to the outer edge 120 of the base plate 100 to shield the outer edge gap 101, and the opposite end edges of the shielding structure 400 are respectively located on the base plate 100 and under the lower substrate 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 the middle part 442, extends downward beyond the lower substrate 200 and then extends inward to the lower surface of the lower substrate 200 to form the lower part 443. The upper part 441 and the lower part 443 are respectively at least partially abutted against the upper surface of the base 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 at least partially abutted against the upper surface of the base plate 100 by the rigidity of the shielding structure 400 itself, 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), thereby fastening and fixing the shielding structure 400 to the outer edge 120 of the base plate 100. In this way, the shielding structure 400 can prevent the light emitted by the light source 300 from being emitted through the outer edge gap 101, that is, to prevent light from leaking from the side of the backlight module 808.

[0099] like Figure 12AIn the illustrated embodiment, the backlight module 808 further includes a spacer 600, a first adhesive layer 610, a second adhesive layer 620, and a third adhesive layer 630. The spacer 600 is disposed between the base plate 100 and the lower substrate 200, and is located between the outermost of the plurality of light sources 300 and the outer edge 120 of the base plate 100. The backlight module 808 further includes a light-shielding sheet 500 disposed between the base plate 100 and the spacer 600. 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. Furthermore, the adhesive layer is typically made of a light-transmitting material, allowing light emitted from the light source to pass through it. The shielding structure 400 prevents 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 escaping through the outer edge gap 101 to the side of the backlight module 808. The first adhesive layer 610, the second adhesive layer 620, and the third adhesive layer 630 may be made of opaque material to further reduce light transmission.

[0100] like Figure 12A In the illustrated embodiment, the base plate 100 has base plate holes 110, and the light-shielding sheet 500 has light-transmitting portions 510. The light-shielding sheet 500 can be formed by printing ink on a film, defining the light-transmitting portions 510. The vertical projections of the plurality of light sources 300 and the plurality of light-transmitting portions 510 onto the base plate 100 overlap with the plurality of base plate holes 110. In other words, each base plate hole 110 corresponds to one light-transmitting portion 510 and one light source 300 below it. However, in different embodiments, based on considerations such as increasing the light-emitting area and improving light emission uniformity, the light source 300 can be used in conjunction with a light guide element and may not be positioned directly below the base plate holes 110 and the light-transmitting portions 510.

[0101] More specifically, such as Figure 12B In the illustrated embodiment, the backlight module 808 further includes a plurality of light guide sheets 320, each light guide sheet 320 being disposed on one side of one of the plurality of light sources 300. The vertical projection of each light guide sheet 320 and its corresponding light-transmitting portion 510 onto the base plate 100 overlaps with the corresponding base plate hole 110. In other words, each base plate hole 110 corresponds to a light-transmitting portion 510 and a light guide sheet 320 below it. The light provided by the light source 300 enters from the side surface 321 of the adjacent light guide sheet 320 and exits from the top surface 322.

[0102] like Figure 13A and 13BIn the different embodiments shown, the shielding structure includes multiple spacers 600. These spacers 600 are arranged in a staggered manner, from near to far, between the base plate 100 and the lower substrate 200, relative to the peripheral portions of the multiple light sources 300. The spacers 600 are located between the peripheral portions of the multiple light sources 300 and the outer edge 120 of the base plate 100. Furthermore, the multiple spacers 600 are connected to the base plate 100 and the lower substrate 200 respectively via a first adhesive layer 641 and a second adhesive layer 642. Since light travels in a straight line, and the multiple spacers 600 (as well as the first adhesive layer 641 and the second adhesive layer 642, etc.) are not on the same straight line relative to the light sources 300, the shielding structure 400 can prevent light emitted by the light sources 300 from escaping through the outer edge gap 101, that is, prevent light leakage from the sides of the backlight module 809. The first adhesive layer 641 and the second adhesive layer 642 can be made of opaque material to further reduce light transmission. On the other hand, light not only attenuates as it travels through a medium, but it may also attenuate when it enters different media due to refraction and partial reflection. Therefore, setting gaps between multiple spacers 600 can promote the attenuation of light.

[0103] like Figure 13A In the illustrated embodiment, the base plate 100 has base plate holes 110, and the vertical projection of the plurality of light sources 300 onto the base plate 100 overlaps with the plurality of base plate holes 110. In other words, each base plate hole 110 corresponds to one light source 300 below it. However, in different embodiments, based on considerations such as increasing the light-emitting area and improving the uniformity of light emission, the light source 300 may be used in conjunction with a light guide element and may not be positioned directly below the base plate holes 110.

[0104] More specifically, such as Figure 13B In the illustrated embodiment, the backlight module 809 further includes a plurality of light guide sheets 320, each light guide sheet 320 being disposed on one side of one of the plurality of light sources 300. The vertical projection of the light guide sheet 320 and the corresponding light-transmitting portion 510 on the base plate 100 overlaps with the corresponding base plate hole 110. In other words, each base plate hole 110 corresponds to one of the light guide sheets 320 below it. The light provided by the light source 300 enters from the side surface 321 of the adjacent light guide sheet 320 and exits from the top surface 322.

[0105] like Figure 14A and 14BIn the different embodiments shown, 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 base plate 100 and the lower substrate 200, and is located between the outermost of the plurality of light sources 300 and the outer edge 120 of the base plate 100. The plurality of first adhesive layers 651 are disposed between the spacer 600 and the base plate 100, and gaps are present 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 gaps are present between the plurality of second adhesive layers 652. Furthermore, light not only attenuates as it travels through a medium, but may also attenuate due to refraction and partial reflection when entering different media. Therefore, providing gaps between the plurality of first adhesive layers 651 and the plurality of second adhesive layers 652 can promote light attenuation. Therefore, the shielding structure 400 can prevent the light emitted by the light source 300 from being emitted through the outer edge gap 101, that is, prevent light leakage from the side of the backlight module 810. The first adhesive layer 651 and the second adhesive layer 652 can be made of opaque material to reduce the transmission of light.

[0106] like Figure 14A In the illustrated embodiment, the base plate 100 has base plate holes 110, and the vertical projection of the plurality of light sources 300 onto the base plate 100 overlaps with the plurality of base plate holes 110. In other words, each base plate hole 110 corresponds to one light source 300 below it. However, in different embodiments, based on considerations such as increasing the light-emitting area and improving the uniformity of light emission, the light source 300 may be used in conjunction with a light guide element and may not be positioned directly below the base plate holes 110.

[0107] More specifically, such as Figure 14B In the illustrated embodiment, the backlight module 810 further includes a plurality of light guide sheets 320, each light guide sheet 320 being disposed on one side of one of the plurality of light sources 300. The vertical projection of each light guide sheet 320 and its corresponding light-transmitting portion 510 onto the base plate 100 overlaps with the corresponding base plate hole 110. In other words, each base plate hole 110 corresponds to one of the light guide sheets 320 below it. The light provided by the light source 300 enters from the side surface 321 of the adjacent light guide sheet 320 and exits from the top surface 322.

[0108] The backlight module of the present invention provides a shielding structure located on the outer side of the multiple light sources distributed among the peripheral ones, so as to prevent the light provided by the multiple light sources from escaping from the outer edge gap between the outer edge of the base plate and the lower substrate, thereby improving the side light leakage phenomenon of the backlight module.

[0109] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A backlight module applicable to a key module, the key module including a plurality of key units and a bottom plate, the plurality of key units being disposed on the bottom plate, characterized in that The backlight module includes: A lower substrate disposed below the bottom plate, with an outer edge gap between the outer edge of the bottom plate and the lower substrate; A plurality of light sources disposed between the bottom plate and the lower substrate; And A shielding structure disposed outside the peripherally distributed light sources among the plurality of light sources to prevent the light provided by the plurality of light sources from emitting out through the outer edge gap; Wherein, the shielding structure includes a plurality of spacers, and the plurality of spacers are arranged between the bottom plate and the lower substrate in a vertically staggered manner from near to far relative to the peripherally distributed light sources among the plurality of light sources, and the plurality of spacers are located between the peripherally distributed light sources among the plurality of light sources and the outer edge of the bottom plate; The backlight module further includes a first adhesive layer and a second adhesive layer. The first adhesive layer is disposed between one of two adjacent spacers and the bottom plate, and the second adhesive layer is disposed between the other of the two adjacent spacers and the lower substrate; The bottom plate has a plurality of bottom plate holes, and the vertical projection of the plurality of light sources on the bottom plate overlaps with the plurality of bottom plate holes; The backlight module further includes a plurality of light guide plates. Each light guide plate is disposed on one side of one of the plurality of light sources. The bottom plate has a plurality of bottom plate holes, and the vertical projection of the plurality of light guide plates on the bottom plate overlaps with the plurality of bottom plate holes. The light provided by the plurality of light sources enters from the side surfaces of the adjacent plurality of light guide plates and exits from the top surfaces.

2. A backlight module applicable to a key module, the key module including a plurality of key units and a bottom plate, the plurality of key units being disposed on the bottom plate, characterized in that The backlight module includes: A lower substrate disposed below the bottom plate, with an outer edge gap between the outer edge of the bottom plate and the lower substrate; A plurality of light sources disposed between the bottom plate and the lower substrate; And A shielding structure disposed outside the peripherally distributed light sources among the plurality of light sources to prevent the light provided by the plurality of light sources from emitting out through the outer edge gap; Wherein, the shielding structure includes: A spacer disposed between the bottom plate and the lower substrate, and the spacer is located between the peripherally distributed light sources among the plurality of light sources and the outer edge of the bottom plate; A plurality of first adhesive layers disposed between the spacer and the bottom plate, and there are gaps between the plurality of first adhesive layers; and A plurality of second adhesive layers disposed between the spacer and the lower substrate, and there are gaps between the plurality of second adhesive layers; The bottom plate has a plurality of bottom plate holes, and the vertical projection of the plurality of light sources on the bottom plate overlaps with the plurality of bottom plate holes; The backlight module further includes a plurality of light guide plates. Each light guide plate is disposed on one side of one of the plurality of light sources. The bottom plate has a plurality of bottom plate holes, and the vertical projection of the plurality of light guide plates on the bottom plate overlaps with the plurality of bottom plate holes. The light provided by the plurality of light sources enters from the side surfaces of the adjacent plurality of light guide plates and exits from the top surfaces.

3. A luminous keyboard, characterized in that Including: A key module including a plurality of key units and a bottom plate, and the plurality of key units are disposed on the bottom plate; and The backlight module according to any one of claims 1-2.

Images