TW202341207A - Backlit module and illuminated keyswitch structure - Google Patents

Abstract

A backlit-module-embedded illuminated keyswitch structure includes a baseplate, a mask film disposed below the baseplate and having a first coating configured to substantially reflect a light, a light guide sheet disposed at one side of the mask film opposite to the baseplate and having a light source hole, a reflective layer disposed at one side of the light guide sheet opposite to the mask film and having an opening communicating with the light source hole, a top glue configured to connect the mask film and the light guide sheet and disposed around the light source hole, and a bottom glue configured to connect the light guide sheet and the reflective layer and disposed around the light source hole, wherein the first coating covers right above the light source hole, and in a stacked direction of the mask film, the light guide sheet, and the reflective layer, at least one of the top glue and the bottom glue overlaps with the first coating.

Description

Backlight module and luminous button structure

The present invention relates to a key structure. Specifically, the present invention relates to a luminous key structure and its backlight module.

At present, in order to improve the brightness of the luminous buttons, a single button is equipped with a structure with a dedicated light source under the base plate to emit upward light. However, such structures usually have the problem of uneven lighting, for example, the characters in the center of the keycap are too bright and the characters in the corners are too dark.

In addition, the keycap outline halo is also one of the functions of the backlight structure to provide keycap boundary recognition. However, the aforementioned configuration will cause the keycap outline halo to be uneven or too dark, making it difficult to identify the keycap characters and keycap boundaries on the keyboard, making it difficult to achieve consistent lighting uniformity.

Furthermore, for heat dissipation or positioning, the buttons usually have heat dissipation holes or positioning holes that penetrate the base plate and its lower diaphragm or plate. However, opening heat dissipation holes or positioning holes will also cause light leakage, so light-shielding design is also required.

One object of the present invention is to provide a backlight module and a light-emitting key structure with a designed glue layer distribution that effectively guides light laterally and then emits light, thereby improving the problem of characters in the middle of the keycap being bright and thereby improving the uniformity of light emission. .

Another object of the present invention is to provide a backlight module and luminous button structure, which uses designed glue layer distribution and optical film set to recover as much light as possible during the lateral transmission of light to avoid light leakage, thereby improving luminous brightness and Uniformity.

In one embodiment, the present invention provides a backlight module, which includes: a light shielding sheet, a light guide sheet, a reflective layer, a top glue and a bottom glue, wherein the light shielding sheet has a first coating to substantially reflect light; the light guide sheet It is arranged on one side of the light shielding sheet, and the light guide sheet has a light source hole; the reflective layer is arranged on the other side of the light guide sheet relative to the light shielding sheet, and the reflective layer has an opening connected with the light source hole; the top glue is used to connect the light shielding sheet and the light guide film and is located around the light source hole; the primer is used to connect the light guide sheet and the reflective layer and is located around the light source hole, where the first coating covers directly above the light source hole and in the stacking direction of the light shielding sheet, light guide sheet and reflective layer On the coating, at least one of the top glue and the bottom glue overlaps the first coating layer.

In one embodiment, the backlight module of the present invention is used to project light to the central hole of the base plate above the backlight module. The light-shielding sheet further has a second coating. The second coating is used to substantially block the light. The second coating It is closer to the base plate than the first coating layer, and the vertical projection of the second coating layer to the base plate is within the range of the central hole.

In one embodiment, the vertical projection of the top glue or bottom glue on the light shielding sheet is located within the range of the first coating layer.

In one embodiment, the top glue or the bottom glue is arranged around the light source hole, and the diameter of the part of the first coating layer directly above the light source hole is larger than the diameter of the top glue.

In one embodiment, there is a top clear area between the top glue and the edge of the light source hole of the light guide sheet, and there is a bottom clear area between the bottom glue and the edge of the light source hole of the light guide sheet.

In one embodiment, the bottom clearance area is larger than the top clearance area.

In one embodiment, the light guide sheet has a plurality of light emitting parts, and the plurality of light emitting parts are not disposed in the top clearance area and the bottom clearance area.

In another embodiment, the present invention provides a light-emitting key structure, which includes: a bottom plate, a light shielding sheet, a light guide sheet, a reflective layer, a top glue and a bottom glue, wherein the bottom plate has an inner rib defining a central hole; the light shielding plate is provided Under the base plate; the light guide sheet is disposed on the other side of the light shielding sheet relative to the base plate, and the light guide sheet has a light source hole; the reflective layer is disposed on the other side of the light guide sheet relative to the light shielding sheet, and the reflective layer has an opening communicating with the light source hole. ; The top glue is disposed on the top surface of the light guide sheet and is located around the light source hole; the bottom glue is disposed on the bottom surface of the light guide sheet and is located around the light source hole, where in the stacking direction of the base plate, light shielding sheet, light guide sheet and reflective layer, At least one of the top glue and bottom glue overlaps the inner rib.

In one embodiment, the light-shielding sheet has a first coating layer and a second coating layer. The first coating layer is used to substantially reflect light. The second coating layer is used to substantially block light. The second coating layer is closer to the base plate than the first coating layer. , the vertical projection of the first coating on the bottom plate overlaps with the central hole and extends to the inner rib, and the vertical projection of the second coating on the bottom plate is within the range of the central hole.

In one embodiment, the base plate further has at least one bridging rib, the at least one bridging rib defines at least one peripheral hole, and the vertical projection of the first coating layer on the base plate further overlaps the at least one bridging rib.

In one embodiment, the light guide sheet has a plurality of light emitting parts, and the plurality of light emitting parts are arranged corresponding to at least one peripheral hole.

In one embodiment, at least one of the top glue and the bottom glue overlaps the inner rib and the first coating layer in the stacking direction.

In one embodiment, the light guide sheet has a plurality of light exit parts, and the vertical projection of the plurality of light exit parts on the bottom plate does not overlap with the inner rib.

In yet another embodiment, the present invention provides a backlight module, which includes: a light-shielding sheet, a driving circuit board, a light guide sheet, a light-emitting component, a top glue and a bottom glue, wherein the light-shielding sheet has a first coating layer for substantial reflection. Light; the drive circuit board is arranged under the light shield; the light guide sheet is arranged between the light shield and the drive circuit board, and the light guide sheet has a light source hole and a plurality of light emitting parts; the light-emitting component is fixed to the drive circuit board through an adhesive layer and is located at the light source hole; the top glue is set on the top surface of the light guide sheet and is located around the light source hole; the bottom glue is set on the bottom surface of the light guide sheet and is located around the light source hole, in the stacking direction of the light shielding sheet, light guide sheet and drive circuit board , at least one of the top glue and bottom glue does not overlap with the adhesive layer.

In one embodiment, the backlight module further includes a through hole that penetrates the light shielding sheet, the light guide sheet and the drive circuit board. The light shielding sheet has a second coating layer to substantially block the light. The first coating layer is thicker than the second coating layer. The layer is closer to the light guide sheet, the first coating layer and the second coating layer are arranged around the through hole, and the first coating layer retreats inward from the through hole than the second coating layer to form an adjustment area.

The backlight module of the present invention further includes: a through hole and a reflective layer, the reflective layer is arranged between the drive circuit board and the light guide sheet; the through hole penetrates the light shielding sheet, the light guide sheet, the reflective layer and the drive circuit board. The backlight module of the present invention is further provided with at least one of a through-hole top glue and a through-hole bottom glue around the through hole, wherein the through-hole top glue is disposed above the light guide sheet; and the through-hole bottom glue is disposed under the light guide sheet.

In one embodiment, at least one of the through-hole top glue and the through-hole bottom glue overlaps the first coating layer in the stacking direction.

In one embodiment, the through-hole top glue or the through-hole bottom glue and the light guide sheet respectively have a top through-hole clear area or a bottom through-hole clear area between the edges of the through holes.

In one embodiment, the adhesive layer is light-transmissive, and a part of the reflective layer is located in the light source hole, so that the reflected light can enter the light guide plate from the wall of the light source hole through the adhesive layer and/or the reflective layer and be transmitted laterally.

In one embodiment, the backlight module further includes a fourth coating layer disposed on the driving circuit board around the through hole to substantially block light.

In one embodiment, the light exit portions of the light guide sheet are located between the light source hole and the through hole, and the light exit portions of the light guide sheet are located between the primer and the through hole primer.

In one embodiment, the backlight module of the present invention further includes a plurality of light-emitting parts and edge glues. The edge glues are arranged along the sides of the keycaps. The vertical projection of the plurality of light-emitting parts on the light-shielding sheet is located between the top glue and the side glue or at the bottom. between glue and edge glue.

Compared with the conventional technology, the backlight module and luminous button structure of the present invention can effectively guide and re-emit light laterally through the designed glue layer distribution and coating design, and recover as much light as possible during the lateral transmission of light. Avoid light leakage to improve luminous brightness and uniformity. Furthermore, the backlight module and luminous button structure of the present invention can effectively reduce light leakage from heat dissipation holes or positioning holes through designed glue layer distribution and light shielding sheet coating design.

The present invention mainly relates to the complex application of the gluing function and optical properties of an adhesive (such as a light-transmitting adhesive layer) in a complex optical path system (a luminous keyboard and luminous buttons with a backlight module). The invention is designed to match the adhesive layer and related The adjustment of the optical components can achieve the ultimate luminous efficiency of the unit light output of the backlight module for a single key or even the entire set of keys, as well as improve the uniformity of the luminescence. Therefore, it is necessary to understand the inventive ideas of each embodiment of the present invention. Please explain in detail how to optimize the design of the backlight module, luminous keys and luminous keyboard of the present invention while taking into account multiple variables and restrictions.

As electronic devices such as laptops and keyboards pursue extreme thinness, luminous buttons and backlight modules are forced to be highly integrated in a small space. In addition, light sources are miniaturized, luminous power is reduced, and optical materials change year by year. This results in the use of different light sources and slight changes in different optical components resulting in huge changes in the luminous effect. The key backlight design must consider complex technical issues and cannot solve the problem through simple design choices.

First of all, light sources with different light entrance positions, different sizes, or different numbers/directions of light-emitting surfaces have highly different heights when matched with the light guide sheet, which can easily cause the optical film to float and cause light leakage. Furthermore, if the relative positions between the light source and the optical films (shielding sheet, light guide sheet, reflective sheet and light source circuit board) are not fixed, optical coupling may also be unstable. However, simply fixing the relative positions of the light source and the optical film through an adhesive layer will fall into a technical trap that seriously affects the optical effect. For example, if the refractive index of the light-transmitting adhesive layer is closer to that of the light guide sheet than that of air, the adhesive layer will more easily destroy the total reflection of the light guide sheet, making it easier for the light guide sheet to emit light from where the adhesive layer is arranged. For example, if a dedicated light source is set up within a keycap area of 1 square centimeter and an ultra-thin key height such as 2 mm or 1.8 mm backlight module is used, and an adhesive layer is used to surround the light source and placed on the light guide sheet and then inward. The reflective light shielding sheet and reflective sheet/light panel will cause a large amount of light just emitted by the light source to directly or indirectly pass through the adhesive layer, both inside and outside the light source hole of the light guide sheet, and between the light shielding sheet and the reflective sheet/light panel. Repeatedly passing through or into the light guide causes unnecessary light loss and reduces the luminous flux transmitted sideways toward the keycap outline. This has a huge impact on low-brightness light source backlight applications, because the keycap halo and corner characters will It would be extremely bleak. If the adhesive layer is only arranged on the keycap outline and not around the light source, the thickness, hole position, and tolerance of the adhesive layer printing before and after the rolling, punching, and heating processes of each optical film layer may cause the light source to shift. , extrusion, push-off and other problems. In addition, the distance between the adhesive layer and the light source, the distance between the adhesive layer and the light source hole of the light guide sheet, the distance between the light source and the light source hole of the light guide sheet, and the relative positions of the adhesive layer and light-shielding/reflective optical elements will also cause differences in light effects.

In contrast, whether the adhesive layer is used in the heat dissipation holes or structural holes (closed holes or open holes), the setting position and the matching design of the optical elements (light absorption/reflection/total reflection/diffusion/refraction, etc.), and the location near the light source Different changes and effects occur when the glue layer is used. For example, if the light shielding sheet and reflector/light panel of the backlight module are bonded to the heat dissipation holes or structural holes, that is, if the adhesive layer is applied outside the edge of the light guide sheet, serious light leakage may occur due to the optical coupling effect of the adhesive layer. If the edges are not bonded with an adhesive layer, allowing light to escape directly from the hole wall of the light guide plate may cause serious light leakage. In other words, the position of the adhesive layer and the optical components must be optimized to reduce light leakage in the heat dissipation holes or structural holes.

Please refer to FIG. 1A , which is a stacking diagram of a light-emitting keyboard according to an embodiment of the present invention. In one embodiment, the luminous keyboard KB of the present invention includes a plurality of keys KS (such as square keys SK or multiple keys MK) and a backlight module BL, wherein each key KS includes a keycap 12, a lifting mechanism 14, and a part of a switch circuit. layer 16, reset member 18 and part of the base plate 10; for the luminous keyboard KB, the backlight module BL includes a light shielding sheet 210, a light guide sheet 220 and a driving circuit board 240, and the driving circuit board 240 may also include a reflective layer 230 and The light-emitting component 250 is disposed thereon.

Please refer to FIG. 1B and FIG. 2 . FIG. 1B is an exploded schematic diagram of the luminous button structure according to one embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of the luminous button structure according to one embodiment of the present invention. Regarding the overall structure of the single-key range, in one embodiment, the luminous key structure 1 of the present invention includes a base plate 10, a keycap 12, a lifting mechanism 14, a switch circuit layer 16, a reset component 18, a light shielding sheet 210, a light guide sheet 220, Reflective layer 230, driving circuit board 240 and light emitting element 250. The keycap 12 is disposed above the base plate 10 and has a light-transmissive portion 122 (such as one or more light-transmissive characters). The lifting mechanism 14 is connected between the base plate 10 and the keycap 12 to support the keycap 12 to move up/down relative to the base plate 10 . The switch circuit layer 16 is disposed below the keycap 12 and is preferably located on the base plate 10 . The switch circuit layer 16 has a switch 162 (shown as a circle in FIG. 1B ). The switch circuit layer 16 has a multi-layer structure, and the switch circuit is formed in one or more layers thereof. When the keycap 12 is pressed, the switch 162 of the switch circuit layer 16 will be turned on. The reset member 18 is disposed between the keycap 12 and the bottom plate 10 to provide a restoring force so that the keycap 12 can move upward relative to the bottom plate 10 after being pressed and return to the position before being pressed. In this embodiment, the reset member 18 can be implemented as a rubber dome and is disposed corresponding to the switch 162 . When the keycap 12 is pressed and moved downward to squeeze the reset member 18, the reset member 18 can trigger the switch 162, but is not limited to this. The switch 162 can be triggered by a trigger part, and the trigger part can be provided on the reset member 18, the lifting mechanism 14 or the keycap 12, etc. Depending on the actual application, the reset member 18 can be implemented as any element that can provide a restoring force to drive the keycap 12 to reset after being pressed, such as springs, magnetic components, etc., and the switch of the luminous key structure 1 is not limited to switches in the form of the switch circuit layer 16 162. Any suitable switch that can be triggered in response to pressing of the keycap 12 is suitable for the present invention, such as mechanical switches, magnetic switches, optical switches, etc. In this embodiment, the lifting mechanism 14 is implemented as a scissor-leg lifting mechanism, which has two brackets pivotally connected to each other, and the two ends of each bracket are movably connected to the base plate 10 and the keycap 12 respectively, but it is not limited to this. Depending on the actual application, the lifting mechanism 14 may be implemented as a butterfly lifting mechanism, a cantilever lifting mechanism, or the like. The key unit of the luminous key structure 1 is composed of the base plate 10 , the keycap 12 , the lifting mechanism 14 , the switch circuit layer 16 and the reset member 18 .

As shown in FIG. 2 , the light-shielding sheet 210 is disposed below the base plate 10 , and the light-shielding sheet 210 preferably has a first coating 212 and a second coating 214 . The first coating layer 212 is used to substantially reflect light (such as the light emitted by the light emitting element 250), and the second coating layer 214 is used to substantially block the light. The light guide sheet 220 is disposed on the other side (eg, the lower side) of the light shielding sheet 210 relative to the base plate 10 , and the light guide sheet 220 has a light source hole 222 corresponding to the central hole 102 of the base plate 10 . The reflective layer 230 is disposed on the other side (eg, the lower side) of the light guide sheet 220 relative to the light shielding sheet 210 , and the reflective layer 230 has an opening 232 communicating with the light source hole 222 . The light-emitting component 250 is fixed to the driving circuit board 240 through the adhesive layer 252 and is electrically connected to the light source circuit of the driving circuit board 240 . The adhesive layer 252 may be a non-conductive adhesive layer only used to fix the light-emitting element 250 to the driving circuit board 240 , and is not a solder paste or other conductive layer that fixes the light-emitting element 250 and electrically connects to the driving circuit board 240 . The driving circuit board 240 is disposed below the light guide sheet 220 so that the light emitting element 250 can extend from below the opening 232 of the reflective layer 230 and be located in the light source hole 222 of the light guide sheet 220 . In one embodiment, the light-emitting element 250 can be a micro light-emitting diode, which can have a five-side light emitting pattern, for example, it mainly emits light from the top surface (for example, 80% of the light is emitted from the top surface), and the remaining light rays are emitted from four sides. Side light, but not limited to this. The above is composed of the light shielding sheet 210, the light guide sheet 220, the reflective layer 230, the driving circuit board 240 and the light emitting element 250 to form the backlight unit (or module) of the luminous key structure 1. In addition, the adhesive layer 252 can be light-transmissive, and a part of the reflective layer 230 surrounding the light-emitting element 250 is provided in the light source hole 222 so that the reflected light can pass through the adhesive layer 252 and/or the reflective layer 230 in the light source hole 222 , and enters the light guide sheet 220 from the hole wall of the light source hole 222 and is transmitted laterally.

Please refer to FIG. 3 and FIG. 3A to FIG. 3D. FIG. 3 shows some components of the light-emitting key structure (such as the base plate 10, the light shielding sheet 210, the light guide sheet 220, and the driving circuit board 240 (including the reflective layer 230) according to an embodiment of the present invention. )), and FIGS. 3A to 3D are schematic plan views of each component of FIG. 3 . As shown in FIG. 3 and FIG. 3A , the bottom plate 10 can be stamped from a metal plate, so that the bottom plate 10 has a plurality of ribs (such as inner ribs 104 , bridging ribs 106 and peripheral ribs 108 ) connected to each other to define a plurality of holes (such as a central hole 102 and surrounding holes 102'). Specifically, the peripheral ribs 108 of the bottom plate 10 are provided at the outermost periphery of the bottom plate 10 , and the peripheral ribs 108 can be frame-shaped ribs or a plurality of ribs connected end to end to form an annular shape, so that the bottom plate 10 has a frame-shaped structure, but is not limited to this. When multiple keys are integrated into the keyboard, the bottom plates 10 of each key can be connected to each other through peripheral ribs 108 to form a single bottom plate. The inner rib 104 is disposed at or near the center of the base plate 10 to define the central hole 102 so that the inner rib 104 surrounds the central hole 102 and the central hole 102 essentially corresponds to the center or near the center of the keycap 12; the plurality of bridging ribs 106 are used to The inner rib 104 and the peripheral rib 108 are connected, and a plurality of peripheral holes 102' are defined between the inner rib 104 and the peripheral rib 108, so that the peripheral holes 102' substantially correspond to the peripheral portion or corner portion of the keycap 12. The central hole 102 and the peripheral hole 102' allow the light emitted by the light-emitting component 250 to pass through, so as to illuminate the keycap 12 and emit from the light-transmissive portion 122.

Specifically, as shown in FIG. 3 and FIG. 3B , the light-shielding sheet 210 is a light-transmissive film (such as terephthalate (PET)), and the film has a first coating 212 formed of a light-shielding material. and second coating 214. In this embodiment, the first coating 212 and the second coating 214 have different light transmittances, so that the first coating 212 can reflect most of the light, and may allow a small part of the light to pass through or absorb a small part of the light. The second coating 214 substantially blocks or absorbs most of the light, and may allow a small portion of the light to pass through or reflect a small portion of the light. For example, the first coating layer 212 can be a white ink layer, and the second coating layer 214 can be a black ink layer, and each can be formed by printing, but is not limited thereto. Furthermore, the second coating 214 is closer to the base plate 10 than the first coating 212 (that is, the first coating 212 is closer to the light guide 220 than the second coating 214), so that most of the light irradiating upward is firstly absorbed by the first coating. The layer 212 reflects, and a small portion of the light passing through the first coating 212 is absorbed by the second coating 214, thereby effectively guiding the light from the vertical upward direction to transverse transmission. In one embodiment, as shown in FIG. 2 , the first coating layer 212 and the second coating layer 214 are preferably disposed on different surfaces of the light-shielding sheet 210 . For example, the first coating layer 212 is disposed on the lower surface of the light-shielding sheet 210 (ie, close to side of the light guide sheet 220), and the second coating layer 214 is disposed on the upper surface of the light shielding sheet 210 (ie, the side close to the base plate 10), but is not limited to this. In another embodiment (not shown), the first coating 212 and the second coating 214 can be disposed on the same surface of the light-shielding sheet 210. For example, the first coating 212 is disposed on the upper surface of the light-shielding sheet 210, and the second coating 214 is disposed on the upper surface of the light-shielding sheet 210. The coating 214 is disposed on the upper surface of the light-shielding sheet 210 and/or the upper surface of the first coating 212; alternatively, the second coating 214 is disposed on the lower surface of the light-shielding sheet 210, and the first coating 212 is disposed on the light-shielding sheet. 210 and/or the lower surface of the second coating 214, whereby most of the light traveling upward is first reflected by the first coating 212, and a small part of the light passing through the first coating 212 is then reflected The second coating 214 absorbs.

It should be noted here that in the following figures (for example, FIG. 3 , FIG. 3B , FIG. 4 , FIG. 5 or FIG. 7 ), the area indicated by the left oblique hatch is the area where the first coating 212 (or 212 ′) is provided. , the area shown by the right oblique hatch is the area where the second coating 214 is provided. When an area exhibits both left oblique and right oblique hatches, it means that the first coating 212 (or 212') and the second coating in the area The layers 214 are overlapped, and the first coating layer 212 is closer to the light guide sheet 220 than the second coating layer 214 .

In one embodiment, the first coating 212 and the second coating 214 are disposed corresponding to the central hole 102, so that the vertical projection of the first coating 212 on the base plate 10 preferably overlaps the central hole 102 and extends to the inner rib 104, and The vertical projection of the second coating 214 on the base plate 10 is preferably located within the range of the central hole 102 . For example, the first coating 212 preferably has a first central coating portion 212a, and the second coating 214 preferably has a second central coating portion 214a, and the first central coating portion 212a and the second central coating portion 212a preferably have a second central coating portion 214a. The layer portions 214a preferably overlap each other and correspond to the central hole 102 of the base plate 10 . As shown in FIG. 3 and FIG. 3B, taking the circular central hole 102 as an example, the diameter of the first central coating part 212a is preferably larger than the diameter of the central hole 102, and the central hole 102 is preferably larger than the second central coating part. 214a diameter. In practical applications, the first coating layer 212 and the second coating layer 214 may have patterns corresponding to the ribs of the base plate 10 , so that when the base plate 10 and the light shielding sheet 210 are stacked up and down, the light transmittable area 218 of the light shielding sheet 210 (i.e. The shape of the portion of the light-transmissive film (not provided with the first coating layer 212 and the second coating layer 214 ) is preferably substantially the same as the peripheral hole 102 ′ of the base plate 10 . As shown in FIG. 3B , in addition to the second central coating portion 214 a located within the central hole 102 , the second coating 214 may also have a portion corresponding to the peripheral rib 108 portion of the base plate 10 . In addition to the first central coating portion 212a covering the central hole 102, the first coating 212 also has portions corresponding to (or overlapping with) the peripheral ribs 108, the bridging ribs 106 and the inner ribs 104 of the base plate 10. The shape and number of the light-transmissive areas 218 corresponding to the peripheral holes 102' are defined, but are not limited thereto. Depending on the actual application, the vertical projection of the first coating 212 (or the second coating 214) on the base plate 10 preferably overlaps with at least one bridging rib 106, but is not limited thereto. As shown in FIG. 4 , in another embodiment, the configuration of the second coating 214 of the light shielding sheet 210 ′ is similar to that of FIG. 3B , that is, the second coating 214 includes a second central coating portion 214 a located in the central hole 102 and Corresponding to the portion of the peripheral rib 108 . In the embodiment of FIG. 4 , the first coating 212 ′ includes the above-mentioned first central coating part 212 a and a part corresponding to the peripheral rib 108 , so that the light-transmitting area 218 ′ is a continuous area, which is vertical to the base plate 10 The projection covers the bridging rib 106 and the peripheral hole 102'. As shown in the figure, the portion of the first coating 212' corresponding to the peripheral ribs 108 preferably protrudes closer to the central hole 102 (ie, has a wider width) than the portion of the second coating 214 corresponding to the peripheral ribs 108, but is not limited to this; In other embodiments, the portion of the first coating 212' corresponding to the peripheral rib 108 may be the same as the portion of the second coating 214 corresponding to the peripheral rib 108 or may be set back (ie, have a narrower width) relative to the central hole 102.

As shown in FIG. 3 and FIG. 3C , the light guide sheet 220 can be a thin plate or sheet made of any suitable optical material (such as optical polymer), and the light source hole 222 extends through the thickness direction of the light guide sheet 220 (ie, the Z-axis). direction), so that the light-emitting element 250 can be located in the light source hole 222, and the first central coating portion 212a of the first coating layer 212 and the second central coating portion 214a of the second coating layer 214 are directly in the light source hole 222. above. The light guide sheet 220 also has a plurality of light exit portions 228 for destroying total reflection and allowing light to be emitted in a direction. The plurality of light-emitting parts 228 is preferably provided corresponding to the peripheral hole 102', but is not limited to this. The light emitting part 228 can be disposed at any suitable location where light is required to emit light. As shown in FIG. 3C , the top glue 262 is disposed on the top surface of the light guide sheet 220 and is located around the light source hole 222 . Specifically, the top glue 262 is used to connect the light shielding sheet 210 and the light guide sheet 220 and is located around the central hole 102 so that the light shielding sheet 210, the light guide sheet 220 and the light-emitting element 250 can be positioned by the top glue 262 to improve the optical coupling. Stability. Furthermore, the top glue 262 can be formed of an adhesive material that is light-transmissive and has a refractive index closer to that of the light guide sheet 220 than that of air, so that the light reflected from the first central coating portion 212a can enter the light guide sheet 220 at a higher ratio. Then, total reflection occurs in the light guide sheet 220 . In addition, there is a top clearance area 272 between the top glue 262 and the edge of the light source hole 222 of the light guide sheet 220 , that is, the area around the light source hole 222 where the top glue 262 is not provided.

As shown in FIG. 3 and FIG. 3D , the reflective layer 230 is disposed on the other side (for example, below) of the light guide sheet 220 relative to the light shielding sheet 210 , and is used to reflect the light leaked from the bottom surface of the light guide sheet 220 back to the light guide sheet 220 . Light sheet 220. Specifically, the reflective layer 230 can be a reflective film made of reflective material (such as a metal foil), a non-reflective film coated with reflective material, or a plastic film doped with reflective particles (such as a plastic film doped with reflective particles). PET film), but is not limited to this. In one embodiment, the reflective layer 230 can be a reflective coating, such as a white ink layer, coated on the upper surface of the driving circuit board 240, and the reflectivity of the reflective layer 230 is preferably greater than 80%, but is not limited thereto. The opening 232 of the reflective layer 230 may be a through hole penetrating the diaphragm forming the reflective layer 230, or an area on the upper surface of the driving circuit board 240 where the light-emitting element 250 is disposed and is not coated with a reflective coating. As shown in FIG. 3D , the primer 264 is disposed on the top surface of the reflective layer 230 (ie, the bottom surface of the light guide sheet 220 ) and is located around the light source hole 222 . Specifically, the primer 264 is used to connect the light guide sheet 220 and the reflective layer 230 and is located around the central hole 102, so that the light guide sheet 220, the reflective layer 230 and the light-emitting element 250 can be positioned by the primer 264, thereby improving the efficiency of optical coupling. Stability. Furthermore, the primer 264 can be formed of an adhesive material that is light-transmissive and has a refractive index closer to that of the light guide sheet 220 than that of air, so that the light reflected from the reflective layer 230 can enter the light guide sheet 220 at a higher proportion, and then in the light guide sheet 220 . Total reflection is performed in the sheet 220. Furthermore, the top glue 262 and the bottom glue 264 can be formed of the same or different adhesive materials, such as but not limited to water glue. In addition, there is a bottom clearance area 274 between the bottom glue 264 and the edge of the light source hole 222 (or opening 232) of the light guide plate 220, that is, the area around the light source hole 222 where the bottom glue 264 is not provided. As shown in FIG. 3D , when the reflective layer 230 is a reflective coating formed on the upper surface of the driving circuit board 240 , the opening 232 is an area on the driving circuit board 240 without primer 264 and reflective layer 230 , and the driving circuit board 240 It also includes main line 242 and sub-line 244. For example, two main lines 242 provide high/low potential respectively, and two sub-lines 244 extend from the two main lines 242 respectively, so that the light-emitting component 250 is electrically connected to the main line 242 through the sub-lines 244 . Furthermore, a light-absorbing layer (not shown) may be provided below the reflective layer 230 to absorb a small amount of light that penetrates the light-absorbing layer.

Referring to Figure 2 again, the layout design of the top glue 262 and the bottom glue 264 is further described. As shown in FIG. 2 , at least one of the top glue 262 and the bottom glue 264 overlaps with the first coating 212 in the stacking direction (such as the Z-axis direction) of the bottom plate 10 , the light shielding sheet 210 , the light guide sheet 220 and the reflective layer 230 . For example, only the top glue 262, only the bottom glue 264, or both the top glue 262 and the bottom glue 264 overlap with the first coating layer 212 in the stacking direction. In one embodiment, as shown in the figure, the vertical projection of the top glue 262 or the bottom glue 264 on the light-shielding sheet 210 may be located within the range of the first coating 212 . As mentioned above, the top glue 262 or the bottom glue 264 is arranged around the light source hole 222, so that there is a top clearance area 272 between the top glue 262 and the hole edge 2222 of the light source hole 222 of the light guide sheet 220, and the bottom glue 264 and the light guide sheet 220 The light source hole 222 has a bottom clearance area 274 between the hole edges 2222 . In this embodiment, the top clearance area 272 and the bottom clearance area 274 are respectively the top surface area of the light guide plate 220 without the top glue 262 and the bottom surface area without the bottom glue 264 around the light source hole 222 . From another point of view, the top clear area 272 and the bottom clear area 274 can be respectively the lower surface area of the light shielding sheet 210 without the top glue 262 and the reflective layer 230 (or the driving circuit board) around the light source hole 222 of the light guide plate 220. 240) The upper surface area of the primer 264 is not provided. In this way, the top glue 262 or the bottom glue 264 can be prevented from entering the light source hole 222 and interfering with the light emission, or from overlapping with the adhesive layer 252 that fixes the light-emitting component 250, thereby increasing unnecessary stacking height. In other words, through the arrangement of the top clearance area 272 and/or the bottom clearance area 274, at least one of the top glue 262 and the bottom glue 264 does not overlap with the adhesive layer 252 fixing the light emitting element 250 in the stacking direction (such as the Z-axis direction). Unnecessary increases in stack height can be effectively avoided. Preferably, both the top glue 262 and the bottom glue 264 do not overlap with the adhesive layer 252 in the stacking direction.

In one embodiment, the bottom clearance area 264 is preferably larger than the top clearance area 262 , that is, the distance between the bottom glue 264 and the hole source 2222 of the light source hole 222 is greater than the distance between the top glue 262 and the hole source 2222 of the light source hole 222 . In this way, the base glue 264 and the reflective layer 230 are prevented from transmitting light upward to reduce the re-emission of light from the central area (such as the central hole 102), and can increase the central recovery of light and increase the proportion of transversely transmitted light.

Furthermore, since the first central coating portion 212a of the first coating 212 overlaps the central hole 102 and extends to the inner rib 104 and overlaps the top glue 262 and/or the bottom glue 264, the top portion adjacent to the light source hole 222 is clear. Zone 272 and bottom clearance zone 274 also overlap the first central coating portion 212a or further overlap the inner rib 104. In other words, at least one (preferably both) of the top glue 262 and the bottom glue 264 overlaps with the first central coating part 212a and the inner rib 104 in the stacking direction (such as the Z-axis direction), so that the clearance area 272 and the bottom clearance Zone 274 also overlaps first central coating portion 212a. In one embodiment, the diameter of the portion of the first coating layer 212 covering directly above the light source hole 222 (ie, the first central coating portion 212a) is preferably larger than the diameter of the top glue 262. Specifically, as shown in FIG. 2A , the first central coating portion 212 a preferably substantially extends completely below the inner rib 104 , so that the first central coating portion 212 a has a larger reflection area to facilitate the central light rays. Lateral guidance, but not limited to this.

As shown in FIG. 2 , the light guide sheet 220 has a plurality of light exit portions 228 for guiding light upwards and outgoing from the light guide sheet 220 . For example, the plurality of light emitting portions 228 are disposed on the bottom surface of the light guide sheet 220, and are preferably disposed corresponding to the peripheral holes 102'. The light-emitting part 228 can be any suitable micro-optical structure, so that when light passes to the light-emitting part 228, the light will be scattered upward. Specifically, the vertical projection of the plurality of light-emitting portions 228 on the bottom plate 10 preferably does not overlap with the inner ribs 104 to form a clear area 226 of the light-emitting portions. In this embodiment, the light exit clearance area 226 preferably corresponds to the vertical projection range of the inner rib 104 and the central hole 102 on the light guide sheet 220 . From another point of view, the plurality of light emitting parts 228 is preferably not disposed in the top clearance area 272 and the bottom clearance area 274, so as to reduce the re-emission of light from the central hole 102, increase the central light recovery, and increase the proportion of lateral light transmission.

Please refer to FIG. 2 and FIG. 2A to further illustrate the lateral transmission and recovery of light in the luminous key structure of the present invention. As shown in FIGS. 2 and 2A , since the first coating layer 212 is closer to the light guide sheet 220 than the second coating layer 214 and covers directly above the light source hole 222 , the light radiating upward from the light-emitting element 250 towards the central hole 102 hits the first coating layer. When the layer 212 (ie, the first central coating portion 212a) is formed, most of the light is reflected by the first coating 212 and enters the light guide sheet 220 due to the existence of the top clearance area 272. Since the light guide sheet 220 does not have a light exit portion 228 in the light exit clear area 226 (for example, the area corresponding to the central hole 102 and the inner rib 104 ), the light entering the light guide sheet 220 is continuously reflected in the light guide sheet 220 and transmitted laterally. . Even if part of the light is reflected to the top glue 262 (or bottom glue 264) and emitted out of the light guide sheet 220, because the top glue 262 (or bottom glue 264), the first coating 212 and the reflective layer 230 are in the stacking direction, Overlap each other, so that the light can be reflected into the light guide sheet 220 again, effectively achieving the recovery and lateral transmission of light, which can not only reduce the amount of light emitted from the central hole 102 (ie, avoid the problem of the central characters of the keycap 12 popping out), but also improve the The amount of light emitted from the periphery (that is, improving the uniformity of light emission). In addition, the size of the second coating 214 (i.e., the second central coating portion 214a) provided within the central hole 102 can be adjusted according to the light emission requirements of the central hole 102 to at least partially block the light passing through the first coating 212. , to further adjust the uniformity of light emission. Furthermore, since the light exit portion 228 is disposed corresponding to the peripheral hole 102' and the first coating 212 can be further disposed corresponding to the bridging rib 106, the light irradiated from the light guide sheet 220 to the bridging rib 106 can also be reflected by the first coating 212 again. It enters the light guide sheet 220, then travels to the light exit portion 228, and is emitted toward the peripheral hole 102'. Thereby, the amount of light emitted from the peripheral holes 102' is effectively increased and the uniformity of light emission is improved.

Furthermore, as shown in FIG. 2A , a reflective layer microstructure 238 can be added to the reflective layer 230 far away from the light-emitting component 250 to guide light upward. When the reflective layer microstructure 238 is disposed overlapping the light emitting portion 228 of the light guide sheet 220, it can be used to increase the amount of light emitted. When the reflective layer microstructure 238 is disposed overlapping the non-light emitting portion of the light guide sheet 220 (for example, overlapping the bridging ribs 106 of the base plate 10 ), light recovery can be promoted.

Please refer to FIG. 5 , which is a schematic plan view of the stacking of some components of a light-emitting key structure according to another embodiment of the present invention. As shown in FIG. 5 , the luminous key structure (or backlight module) further includes at least one side of glue 268 , and the side glue 268 is preferably disposed along the side of the keycap 12 . The vertical projection of the plurality of light-emitting parts on the light-shielding sheet 210 is preferably located between the top glue 262 and the side glue 268 or between the bottom glue 264 and the side glue 268 . Specifically, the light emitting part is located between the light guide sheet 220 and the reverse side layer 230 . For example, a plurality of light emitting parts may be formed in the light emitting part 228 on the lower surface of the light guide sheet 220 or the reflective microstructure 238 formed on the upper surface of the reflective layer 230 to guide light upward. The edge glue 268 can be disposed between the light shielding sheet 210 and the driving circuit board 240 , between the light shielding sheet 210 and the light guide sheet 220 , between the driving circuit board 240 and the light guide sheet 220 , and/or between the light shielding sheet 210 and the reflective layer. Between 230 to enhance the adhesion between components. In this embodiment, the edge rubber 268 is preferably arranged parallel to the side of the keycap 12, and the edge rubber 268 is located outside the vertical projection of the keycap 12, but is not limited to this.

Please refer to FIGS. 6 and 7 . FIG. 6 is a schematic cross-sectional view of a light-emitting key structure according to another embodiment of the present invention, and FIG. 7 is a schematic plan view of stacking some components of the light-emitting key structure according to another embodiment of the present invention. As shown in FIG. 6 and FIG. 7 , the light-emitting key structure further has a through hole 103 . The through hole 103 penetrates the base plate 10 , the light shielding sheet 210 , the light guide sheet 220 , the reflective layer 230 and the driving circuit board 240 to serve as a heat dissipation hole or a positioning hole for the light-emitting key structure. Corresponding to the arrangement of the through hole 103, the luminous key structure further includes a through hole top glue 262a and a through hole bottom glue 264a. The through-hole top glue 262a is disposed on the light guide sheet 220 and is located around the through hole 103. The through hole primer 264a is disposed under the light guide sheet 220 and around the through hole 103. For example, the through hole 103 is preferably disposed adjacent to the outside of the keycap 12 or in the key gap area between adjacent keys. The first coating 212 (such as the first peripheral coating portion 212b) and the second coating 214 (such as the second peripheral coating portion 214b) are disposed around the through hole 103, and the first coating 212 is smaller than the second coating 214. The through hole 103 is set back inwardly to form an adjustment area 216 .

Specifically, the first coating 212 may include a first central coating part 212a and a first peripheral coating part 212b, and may be formed on the lower surface of the light shielding sheet 210 corresponding to the central hole 102 and the through hole 103 through the same printing process. s position. The second coating 214 may include a second central coating part 214a and a second peripheral coating part 214b, and may be formed on the upper surface of the light shielding sheet 210 at positions corresponding to the central hole 102 and the through hole 103 respectively through the same printing process. However, Not limited to this. The second peripheral coating portion 214b preferably extends to the edge of the through hole 103 . As shown in FIG. 7 , the hole edge 214b1 of the second peripheral coating part 214b is consistent with the hole edge of the through hole 103. There is a gap between the first peripheral coating part 212b and the light shielding sheet 210 at the edge of the through hole 103 to form an adjustment area 216. As shown in FIG. 7 , there is a gap between the hole edge 212b1 of the first peripheral coating part 212b and the hole edge 214b1 of the through hole 103 (or the hole edge 214b1 of the second peripheral coating part 214b), and the first peripheral coating part 212b is further retracted from the hole edge 105 of the base plate 10 relative to the through hole 103 . In other words, the first peripheral coating part 212b does not extend to the hole edge of the through hole 103, nor does it extend to the hole edge 105 of the base plate 10 (that is, it is not disposed in the adjustment area 216), so that the second peripheral coating part 214b is smaller than the second peripheral coating part 214b. A peripheral coating part 212b protrudes toward the direction of the through hole 103, that is, the pore diameter of the second peripheral coating part 214b is smaller than the pore diameter of the first peripheral coating part 212b. Thereby, the adjustment area 216 without the first peripheral coating part 212b reduces the chance of light reflecting into the through hole 103 again, and the second peripheral coating part 214b can block the light emitted upward from the adjustment area 216 to reduce the through hole. Light leakage from hole 103. Furthermore, the luminous key structure may optionally include a third coating (not shown), where the third coating is disposed in the adjustment area 216 and is used to substantially block or absorb light. Specifically, according to actual needs, a third coating with lower transmittance can be provided in the adjustment area 216 to reduce the light emitted upward through the adjustment area 216 and further reduce the light leakage of the through hole 103 . The light transmittance of the third coating layer is preferably smaller than the light transmittance of the first coating layer 212 , and the third coating layer and the second coating layer 214 can be made of the same or different light-shielding materials. For example, the third coating layer may be a black ink layer. Similarly, the reflective layer 230 can also be retracted relative to the edge of the through hole 103 , so that an adjustment area 234 is formed between the reflective layer 230 and the edge of the through hole 103 . The adjustment area 234 can be provided with a fourth coating (not shown) with lower reflectivity (or higher light absorption rate) to reduce the upward reflection of light by the adjustment area 234 and reduce the forward oblique reflection of the light side, further reducing the throughput. Light leakage from hole 103. The reflectivity of the fourth coating layer is preferably smaller than the reflectance of the reflective layer 230 , and the fourth coating layer and the second coating layer 214 may be the same or different light-shielding materials. For example, the fourth coating layer may be a black ink layer. Thereby, the adjustment area 234 where the reflective layer 230 (or the fourth coating layer is not provided) reduces the chance of reflecting light into the through hole 103 again, thereby reducing the light leakage of the through hole 103 . However, the fourth coating can also be a light-absorbing packaging material (such as the coating layer 280) on the back side (bottom side) of the driving circuit board 240, which is exposed upward and absorbs light because of the adjustment zone 234 of the reflective layer 230 that retreats; or, the adjustment zone 234 does not need to originate from the shrinkage of the reflective layer 230. The fourth coating layer is directly disposed on the reflective layer 230 to surround the through hole 103, and a light-absorbing adjustment area 234 can also be formed. In other words, whether the fourth coating layer is located on the reflective layer 230 or the driving circuit board 240, it can reduce the light leakage problem. Even, if necessary, the edges of the light-shielding sheet 210 and the driving circuit board 240 around the through-hole 103 can be adhered to each other in the through-hole 103 through through-hole glue (not shown).

At least one of the through-hole top glue 262a and the through-hole bottom glue 264a overlaps the first coating 212 (such as the first peripheral coating part 212b) in the stacking direction (such as the Z-axis direction), and the through-hole top glue 262a and the through-hole bottom glue 262a The hole bottom glue 264a and the light guide sheet 220 preferably have a top through hole clear area 276 and a bottom through hole clear area 278 respectively between the hole edges of the through hole 103. Specifically, the through-hole top glue 262a and the through-hole bottom glue 264a are disposed around the through hole 103, which can guide a specific proportion of light to be transmitted in a vertical direction, thereby reducing the amount of light leaking from the through hole 103. Furthermore, the vertical projection of the first coating 212 (ie, the first peripheral coating portion 212b) on the light guide sheet 220 preferably completely covers the through-hole top glue 262a (and the through-hole bottom glue 264a), and the through-hole top glue 262a (and the through-hole primer 264a) preferably completely fall within the vertical projection of the first coating 212 (ie, the first peripheral coating portion 212b) and the second coating 214 (ie, the second peripheral coating portion 214b). Thereby, the amount of light entering the through hole 103 through the through hole top glue 262a (and the through hole bottom glue 264a) can be effectively reduced, and the light leakage of the through hole 103 can be effectively reduced.

The top through-hole clearance area 276 and the bottom through-hole clearance area 278 are respectively the top surface area of the light guide sheet 220 without a through-hole top glue 262a and a bottom surface area without a through-hole bottom glue 264a around the through hole 103, and the top surface area is not provided with the through-hole bottom glue 264a. The via clearance area 276 and the bottom via clearance area 278 preferably correspond to each other in the stacking direction (eg, Z-axis direction). In this way, the through-hole top glue 262a or the through-hole bottom glue 264a can be prevented from entering the through hole 103 and interfering with heat dissipation or positioning, and the amount of light entering the through hole 103 through the through-hole top glue 262a (and the through-hole bottom glue 264a) can also be reduced. The light leakage of the through hole 103 is effectively reduced. In one embodiment, the top through-hole clearance area 276 and the bottom through-hole clearance area 278 may be selectively provided with a fifth coating (not shown) with lower reflectivity (or higher light absorption rate) to reduce light entering the through holes. 103 opportunity to further reduce the light leakage of the through hole 103. The fifth coating layer may be the same or different light-shielding material as the second coating layer 214 . For example, the fifth coating layer may be a black ink layer.

As shown in FIG. 6 , in this embodiment, the light-emitting key structure may further include a coating layer 280 . The cladding layer 280 is disposed under the driving circuit board 240 and extends to the projection range of the through hole 103 . The cladding layer 280 can extend in a plane to at least partially cover the bottom of the through hole 103 , and can partially extend into the through hole 103 through processing. The cladding layer 280 preferably has a high light absorption rate to absorb the light in the through hole 103 and reduce the light leakage of the through hole 103 . In one embodiment, the coating layer 280 can extend into the through hole 103 and further be joined or bonded to the second coating 214 (ie, the second peripheral coating portion 214b). In one embodiment, the hole diameter of the second peripheral coating portion 214b (for example, the length of the hole edge 214b1 in the X-axis direction) is preferably smaller than the hole diameter of the through hole 103 located on the bottom plate 10 (for example, the length of the hole edge 105 in the X-axis direction). ), is smaller than the aperture of the through hole 103 located on the light guide sheet 220 , and smaller than the aperture of the through hole 103 located on the driving circuit board 240 . Corresponding to the through hole 103, the aperture of the cladding layer 280 is preferably smaller than the aperture of the through hole 103 located in the base plate 10 (for example, the length of the hole edge 105 in the X-axis direction), smaller than the aperture of the through hole 103 located in the light guide sheet 220, smaller than the The hole 103 is located in the aperture of the driving circuit board 240 and is smaller than the aperture of the through hole 103 in the reflective layer 230 .

It should be noted here that when the light-emitting key structure of the present invention is applied to the situation where the keycap characters are located in the surrounding corners, only a small amount or even no need for the light-emitting member 250 to directly emit light upward, and the size of the central hole 102 of the base plate 10 can be reduced or Even the central hole 102 may not be provided, but is not limited to this. In another embodiment, the size of the portion of the first coating layer 212 of the light-shielding sheet 210 covering the light-emitting element 250 (ie, the first central coating portion 212a) can be increased, or the first coating layer 212 can be made of a metal layer. Increase the reflectivity, thereby increasing the amount of light transmitted laterally, and improving the brightness around the keycap (i.e., the surrounding corners).

8A to 8D are schematic plan views of the glue layer layout according to an embodiment of the present invention, in which the right oblique hatching represents the coating area of the top glue 262, and the left oblique hatching represents the coating area of the bottom glue 264. As shown in FIG. 8A , in the first embodiment, both the top glue 262 and the bottom glue 264 have a closed annular coating area surrounding the light source hole 222 . As shown in FIG. 8B , in the second embodiment, the top glue 262 has a closed annular coating area surrounding the light source hole 222 , and the bottom glue 264 has an open annular coating area partially surrounding the light source hole 222 . For example, in the sector area 263 , only the top glue 262 is provided on the top surface of the light guide sheet 220 , and the bottom glue 264 is not provided on the bottom surface of the light guide sheet 220 . As shown in FIG. 8C , in the third embodiment, the top glue 262 has a closed annular coating area surrounding the light source hole 222 , and the bottom glue 264 has an open annular coating area partially surrounding the light source hole 222 . The opening of the annular coating zone has a local coating zone. For example, in the sector-shaped area 263, only the top glue 262 is provided on the top surface of the light guide sheet 220, and no bottom glue 264 is provided on the bottom surface of the light guide sheet 220, and in the reinforcing area that at least partially overlaps the sector-shaped area 263 In 266, a primer 264 is further provided on the bottom surface of the light guide sheet 220. As shown in FIG. 8D , in the fourth embodiment, both the top glue 262 and the bottom glue 264 have a closed annular coating area surrounding the light source hole 222 , and there is a glue-free gap between the top glue 262 and the edge of the light source hole 222 . There is a top clearance area 272, and there is a bottom clearance area 274 without glue between the bottom glue 264 and the hole edge of the light source hole 222.

The present invention has been described by the above-mentioned embodiments. However, the above-mentioned embodiments are only for illustrative purposes and not for limitation. Those skilled in the art will appreciate that other modifications of the illustrated embodiments may be made to the embodiments specifically described herein without departing from the spirit of the invention. Accordingly, the scope of the present invention also encompasses such modifications and is limited only by the scope of the appended claims.

1: Illuminated button structure 10: Bottom plate 102:Central hole 102’: Peripheral hole 103:Through hole 105: Kong Yuan 104:Inner ribs 106:Bridge rib 108: Peripheral ribs 12:Keycap 122: Translucent part 14:Lifting mechanism 16: Switch circuit layer 162: switch 18:Reset piece 210, 210’: shading film 212, 212’: first coating 212a: First central coating section 212b: First peripheral coating part 212b1: hole edge 214: Second coating 214a: Second central coating section 214b: Second peripheral coating part 214b1: hole edge 216:Adjustment area 218, 218’: Translucent area 220:Light guide sheet 222:Light source hole 2222: hole edge 226: Clearance area of light output part 228: Light department 230: Reflective layer 232:Open your mouth 234:Adjustment area 238: Reflective layer microstructure 240:Driver circuit board 242: Main line 244:Subline 250:Lighting parts 252:Adhesive layer 262: Top glue 262a: Through-hole top glue 263: sector area 264: Primer 264a: Through-hole primer 266: Reinforcement area 268:Edge glue 272: Top clearance area 274: Bottom clearance area 276: Clearance area of top through hole 278: Bottom through hole clearance area 280: Cladding BL: Backlight module KB: Illuminated Keyboard KS: button SK: square key MK: multiple key

FIG. 1A is a schematic diagram of a stack of light-emitting keyboards according to an embodiment of the present invention. FIG. 1B is an exploded schematic diagram of a light-emitting key structure according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a light-emitting key structure according to an embodiment of the present invention. FIG. 2A is a schematic diagram of light transmission of a light-emitting key structure according to an embodiment of the present invention. 3 is a schematic plan view of the stacking of some components of the light-emitting key structure according to an embodiment of the present invention. 3A to 3D are schematic plan views of various components of FIG. 3 . FIG. 4 is a schematic plan view of a light-shielding sheet according to another embodiment of the present invention. 5 is a schematic plan view of the stacking of some components of a light-emitting key structure according to another embodiment of the present invention. FIG. 6 is a schematic cross-sectional view of a light-emitting key structure according to another embodiment of the present invention. 7 is a schematic plan view of the stacking of some components of a light-emitting key structure according to another embodiment of the present invention. 8A to 8D are schematic plan views of the glue layer layout according to an embodiment of the present invention.

10: Bottom plate

102:Central hole

102’: Peripheral hole

104:Inner ribs

106:Bridge rib

108: Peripheral ribs

12:Keycap

122: Translucent part

14:Lifting mechanism

16: Switch circuit layer

162: switch

18:Reset piece

210:shading film

212: First coating

214: Second coating

220:Light guide sheet

222:Light source hole

2222: hole edge

226: Clearance area of light output part

228: Light department

230: Reflective layer

232:Open your mouth

240:Driver circuit board

250:Lighting parts

252:Adhesive layer

262: Top glue

264: Primer

272: Top clearance area

274: Bottom clearance area

Claims (25)

A backlight module including: A light-shielding sheet having a first coating, the first coating being used to substantially reflect a light; A light guide sheet is provided on one side of the light shielding sheet, and the light guide sheet has a light source hole; A reflective layer is provided on the other side of the light guide sheet relative to the light shielding sheet, and the reflective layer has an opening connected to the light source hole; A top glue is used to connect the light shielding sheet and the light guide sheet and is located around the light source hole; and A primer used to connect the light guide sheet and the reflective layer and located around the light source hole, The first coating layer covers directly above the light source hole, and in the stacking direction of the light shielding sheet, the light guide sheet and the reflective layer, at least one of the top glue and the bottom glue is in contact with the first coating layer overlap. The backlight module of claim 1, wherein the backlight module is used to project light to a central hole of a bottom plate above the backlight module, wherein the light shielding sheet has a second coating, and the second coating The second coating layer is used to substantially block the light, the second coating layer is closer to the base plate than the first coating layer, and the vertical projection of the second coating layer on the base plate is within the range of the central hole. The backlight module of claim 1, wherein the vertical projection of the top glue or the bottom glue on the light shielding sheet is located within the range of the first coating layer. The backlight module of claim 3, wherein the top glue or the bottom glue is arranged around the light source hole, and the diameter of the part of the first coating covering directly above the light source hole is larger than the diameter of the top glue. The backlight module of claim 1, wherein there is a top clearance area between the top glue and the edge of the light source hole of the light guide sheet, and the bottom glue and the hole of the light source hole of the light guide sheet There is a bottom clearance area between the edges. The backlight module of claim 5, wherein the bottom clearance area is larger than the top clearance area. The backlight module of claim 5, wherein the light guide sheet has a plurality of light emitting parts, and the plurality of light emitting parts are not disposed in the top clearance area and the bottom clearance area. A luminous button structure, including: a base plate having an internal rib defining a central hole; A light-shielding sheet is arranged below the base plate; A light guide sheet is disposed on the other side of the light shielding sheet relative to the base plate, and the light guide sheet has a light source hole; A reflective layer is provided on the other side of the light guide sheet relative to the light shielding sheet, and the reflective layer has an opening connected to the light source hole; A top glue is disposed on the top surface of the light guide sheet and located around the light source hole; and A bottom glue is provided on the bottom surface of the light guide sheet and located around the light source hole, In a stacking direction of the base plate, the light shielding sheet, the light guide sheet and the reflective layer, at least one of the top glue and the bottom glue overlaps the inner rib. The luminous button structure as claimed in claim 8, wherein the light-shielding sheet has a first coating and a second coating, the first coating is used to substantially reflect a light, and the second coating is used to substantially block the light. Light, the second coating is closer to the bottom plate than the first coating, the vertical projection of the first coating on the bottom plate overlaps the central hole and extends to the inner rib, the second coating is on the bottom plate The vertical projection lies within the central hole. The luminous key structure of claim 9, wherein the base plate further has at least one bridging rib, the at least one bridging rib defines at least one peripheral hole, and the vertical projection of the first coating on the base plate is further aligned with the at least one bridging rib. A bridging rib overlap. The luminous key structure of claim 10, wherein the light guide sheet has a plurality of light emitting parts, and the plurality of light emitting parts are arranged corresponding to the at least one peripheral hole. The luminous key structure of claim 9, wherein at least one of the top glue and the bottom glue overlaps the inner rib and the first coating in the stacking direction. The luminous button structure as described in claim 8, wherein there is a top clearance area between the top glue and the edge of the light source hole of the light guide sheet, and the bottom glue and the hole edge of the light source hole of the light guide sheet There is a clear space at the bottom. The luminous button structure as claimed in claim 13, wherein the bottom clearance area is larger than the top clearance area. The luminous key structure of claim 13, wherein the light guide sheet has a plurality of light emitting parts, and the plurality of light emitting parts are not disposed in the top clearance area and the bottom clearance area. The light-emitting key structure of claim 8, wherein the light guide sheet has a plurality of light-emitting parts, and the vertical projection of the plurality of light-emitting parts on the bottom plate does not overlap with the inner rib. A backlight module including: A light-shielding sheet having a first coating layer for substantially reflecting light; A driving circuit board is provided below the light shield; A light guide sheet is disposed between the light shielding sheet and the drive circuit board. The light guide sheet has a light source hole and a plurality of light emitting parts; A light-emitting component is fixed to the drive circuit board through an adhesive layer and is located in the light source hole; A top glue is disposed on the top surface of the light guide sheet and located around the light source hole; and A bottom glue is provided on the bottom surface of the light guide sheet and located around the light source hole, In a stacking direction of the light shielding sheet, the light guide sheet and the driving circuit board, at least one of the top glue and the bottom glue does not overlap with the adhesive layer. The backlight module of claim 17 further includes a through hole that penetrates the light shielding sheet, the light guide sheet and the driving circuit board: Wherein, the light-shielding sheet has a second coating to substantially block the light, and the first coating is closer to the light guide sheet than the second coating; The first coating layer and the second coating layer are arranged around the through hole, and the first coating layer is retreated inwardly from the through hole compared to the second coating layer to form an adjustment area. The backlight module as described in claim 17 further includes: a through hole; A reflective layer is provided between the driving circuit board and the light guide sheet; Wherein, the through hole penetrates the light shielding sheet, the light guide sheet, the reflective layer and the drive circuit board, and the backlight module is further provided with at least one of a through hole top glue and a through hole bottom glue around the through hole, wherein The through-hole top glue is disposed on the light guide sheet, and the through-hole bottom glue is disposed under the light guide sheet. The backlight module of claim 19, wherein at least one of the through-hole top glue and the through-hole bottom glue overlaps the first coating layer in the stacking direction. The backlight module of claim 19, wherein the through hole top glue or the through hole bottom glue and the light guide sheet have a top through hole clear area or a bottom through hole clear area between the edges of the through hole. The backlight module of claim 19, wherein the adhesive layer is light-transmissive, and a part of the reflective layer is located in the light source hole, so that reflected light can pass through the adhesive layer and/or the reflective layer, The light passes through the hole wall of the light source hole and enters the light guide sheet laterally. The backlight module of claim 17 further includes a fourth coating layer disposed on the driving circuit board around the through hole to substantially block light. The backlight module of claim 19, wherein the light exit portions of the light guide sheet are located between the light source hole and the through hole, and the light exit portions of the light guide sheet are located between the primer and the through hole. between the base glue. The backlight module as described in claim 1 or 17, wherein the backlight module further includes a plurality of light-emitting parts and edge glue, the edge glue is provided along the side of a keycap, and the plurality of light-emitting parts are vertically projected from the light shielding sheet Located between the top glue and the edge glue or between the bottom glue and the edge glue.

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