Backlight module
By optimizing the distribution of light emitting parts and the microstructure design of the light guide plate in the keyboard backlight module, the problems of large number of LEDs and uneven brightness in the prior art are solved, cost reduction and brightness uniformity are achieved, and light utilization is improved.
Patent Information
- Application Number
- CN202510463650.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-14
- Publication Date
- 2025-07-25
AI Technical Summary
While maintaining brightness uniformity, the existing keyboard backlight modules have a large number of LEDs, resulting in high costs and increased heat dissipation demand. The heat dissipation holes of the light guide plate affect light conduction, resulting in uneven brightness.
The backlight module design is adopted that includes a circuit board, a light guide plate and a film. By setting multiple through holes on the light guide plate to accommodate the light emitting parts, and setting a single-key light transmitting area and a light shielding area on the film, the distribution method of the light emitting parts is optimized, so that the distance between the light emitting parts and the width of the light shielding area meets specific conditions to reduce the number of LEDs, and at the same time, the microstructure density difference of the light guide region is used to adjust the brightness uniformity.
While maintaining brightness uniformity, the number of LEDs is reduced, the cost is reduced, and higher light utilization and brightness consistency is achieved by optimizing the microstructure density.
Smart Images
Figure CN120376363A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a backlight module, and particularly to a backlight module applicable to a keyboard. Background Art
[0002] The existing backlight modules of keyboards have the following three designs. The first design is to set at least one light-emitting diode (LED) under each keycap. Since this design requires a relatively large number of LEDs, the cost is relatively high. The second design is to use an LED strip and a light guide plate. The LED strip is perpendicular to the long side of the backlight module and is located in the middle of the backlight module. The light emitted by the LED strip is conducted to the left and right sides of the backlight module through the light guide plate. Since the length of the LED strip is approximately the width of the backlight module, this design only requires about 10 to 16 LEDs, thus reducing the cost. However, since the conduction distance of the light emitted by the LED strip in the light guide plate is limited, the larger the size of the backlight module, the lower the brightness on the left and right sides of the backlight module. The third design is to arrange the LED strip along one long side of the backlight module, and the light emitted by the LED strip is conducted to the other long side of the backlight module through the light guide plate. This design can solve the problem of uneven brightness in the second design. However, since the length of the LED strip is approximately the length of the backlight module, this design requires about 20 - 30 LEDs, increasing the cost. Moreover, if the backlight module has heat dissipation requirements, more heat dissipation holes need to be provided on the light guide plate. The more heat dissipation holes there are, the more the light conduction will be hindered, and the lower the brightness on the other long side of the backlight module will be.
[0003] Therefore, how to reduce the number of LEDs while maintaining brightness uniformity is a technical problem that needs to be solved by the existing keyboard backlight modules. Summary of the Invention
[0004] To solve the foregoing technical problems, the present invention provides a backlight module, which includes a circuit board, a light guide plate, and a film. The circuit board has a first light-emitting component and a second light-emitting component. The light guide plate is disposed on the circuit board and has a first through hole and a second through hole. The first light-emitting component is received in the first through hole, and the second light-emitting component is received in the second through hole. The film is disposed on the light guide plate and has a first single-key light-transmitting area, a second single-key light-transmitting area, and a first light-shielding area. The first light-shielding area is located between the first single-key light-transmitting area and the second single-key light-transmitting area. The second single-key light-transmitting area is located between the first light-emitting component and the second light-emitting component. There is no light-emitting component between the first light-emitting component and the second light-emitting component. The first single-key light-transmitting area and the second single-key light-transmitting area have a first width in a direction parallel to one long side of the film. The first light-shielding area has a second width in this direction. The distance between the center of the first light-emitting component and the center of the second light-emitting component is greater than or equal to the sum of the first width and the second width, and less than or equal to twice the sum of the first width and the second width.
[0005] In some embodiments, the film further has a second light-shielding area. The second single-key light-transmitting area is located between the first light-shielding area and the second light-shielding area. The first light-emitting component is disposed corresponding to the first single-key light-transmitting area. The second light-emitting component is disposed corresponding to the second light-shielding area.
[0006] In some embodiments, the film further has a third single-key light-transmitting area. The second light-shielding area is located between the second single-key light-transmitting area and the third single-key light-transmitting area. The light guide plate has a first light-guiding area, a second light-guiding area, and a third light-guiding area corresponding to the first single-key light-transmitting area, the second single-key light-transmitting area, and the third single-key light-transmitting area respectively. The microstructure density of the third light-guiding area is greater than the microstructure density of the second light-guiding area. The microstructure density of the second light-guiding area is greater than the microstructure density of the first light-guiding area.
[0007] In some embodiments, the film further has a second light-shielding area. The second single-key light-transmitting area is located between the first light-shielding area and the second light-shielding area. The first light-emitting component is disposed corresponding to the first light-shielding area. The second light-emitting component is disposed corresponding to the second light-shielding area.
[0008] In some embodiments, the film further has a third single-key light-transmitting area. The second light-shielding area is located between the second single-key light-transmitting area and the third single-key light-transmitting area. The light guide plate has a first light-guiding area, a second light-guiding area, and a third light-guiding area corresponding to the first single-key light-transmitting area, the second single-key light-transmitting area, and the third single-key light-transmitting area respectively. The microstructure density of the second light-guiding area is less than the microstructure density of the first light-guiding area and the microstructure density of the third light-guiding area. The microstructure density of the first light-guiding area is substantially equal to the microstructure density of the third light-guiding area.
[0009] In some embodiments, the film further has a second light-shielding region and a third single-bond light-transmitting region. The second single-bond light-transmitting region is located between the first light-shielding region and the second light-shielding region. The second light-shielding region is located between the second single-bond light-transmitting region and the third single-bond light-transmitting region. The first light-emitting element is disposed corresponding to the first single-bond light-transmitting region. The second light-emitting element is disposed corresponding to the third single-bond light-transmitting region.
[0010] In some embodiments, the light guide plate has a first light guide region, a second light guide region, and a third light guide region corresponding to the first single-bond light-transmitting region, the second single-bond light-transmitting region, and the third single-bond light-transmitting region, respectively. The microstructure density of the second light guide region is greater than the microstructure density of the first light guide region and the microstructure density of the third light guide region. The microstructure density of the first light guide region is substantially equal to the microstructure density of the third light guide region.
[0011] In some embodiments, a reflective portion is provided on a surface of the film facing the light guide plate, and the reflective portion corresponds to the first light-emitting element.
[0012] In some embodiments, when the projection of the first light-emitting element on the film is located within the first single-bond light-transmitting region, the film further has a light-shielding portion, and the light-shielding portion is located between the reflective portion and the film and corresponds to the first light-emitting element.
[0013] In some embodiments, a long side of the first light-emitting element is perpendicular to a long side of the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 is a top view schematic diagram of the backlight module of the present invention;
[0015] Figure 2 is an exploded schematic diagram of the backlight module of the present invention;
[0016] Figure 3 is a partial enlarged view of the backlight module of the present invention;
[0017] Figure 4 is another partial enlarged view of the backlight module of the present invention;
[0018] Figure 5 is another partial enlarged view of the backlight module of the present invention;
[0019] Figure 6 is another partial enlarged view of the backlight module of the present invention;
[0020] Figure 7 is another partial enlarged view of the backlight module of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0021] The following will clearly and completely describe the embodiments of the present invention in conjunction with the accompanying drawings. The elements in the drawings are not drawn to scale and are only used to illustrate the embodiments of the present invention. The terms "first", "second", etc. mentioned below do not represent any order, quantity or importance, but are only used to distinguish different parts.
[0022] Please refer to Figure 1 and Figure 2 , the present invention provides a backlight module 1, which includes a circuit board 2, a light guide plate 3 and a film 4. The circuit board 2 has a plurality of light emitting elements 20. The circuit board 2 can be, but is not limited to, a flexible circuit board. The light emitting element 20 can be a light emitting diode. More specifically, the light emitting element 20 can be a sub-millimeter light emitting diode, but is not limited thereto. The light guide plate 3 is disposed on the circuit board 2 and has a plurality of through holes 30. Each through hole 30 is used to accommodate a light emitting element 20. The film 4 is disposed on the light guide plate 3 and has a plurality of single key light transmissive areas 40 and a light shielding area 41 surrounding the plurality of single key light transmissive areas 40. That is, the plurality of single key light transmissive areas 40 are a plurality of independent areas separated by the light shielding area 41.
[0023] Please refer to Figures 1 to 5, a plurality of light-emitting elements 20 includes a first light-emitting element 21 and a second light-emitting element 22. A plurality of through holes 30 includes a first through hole 301 and a second through hole 302. The first light-emitting element 21 is received in the first through hole 301, and the second light-emitting element 22 is received in the second through hole 302. A plurality of single-key light-transmitting regions 40 includes a first single-key light-transmitting region 401, a second single-key light-transmitting region 402, and a third single-key light-transmitting region 403. The light-shielding region 41 includes a first light-shielding region 411 and a second light-shielding region 412. The first light-shielding region 411 is located between the first single-key light-transmitting region 401 and the second single-key light-transmitting region 402. The second single-key light-transmitting region 402 is located between the first light-shielding region 411 and the second light-shielding region 412. The second light-shielding region 412 is located between the second single-key light-transmitting region 402 and the third single-key light-transmitting region 403. That is, the first single-key light-transmitting region 401, the first light-shielding region 411, the second single-key light-transmitting region 402, the second light-shielding region 412, and the third single-key light-transmitting region 403 are arranged in sequence in the direction LD. The second single-key light-transmitting region 402 is located between the first light-emitting element 21 and the second light-emitting element 22, and no other light-emitting elements are provided between the first light-emitting element 21 and the second light-emitting element 22. That is, no light-emitting element needs to be provided in the second single-key light-transmitting region 402. The first single-key light-transmitting region 401, the second single-key light-transmitting region 402, and the third single-key light-transmitting region 403 have a first width W1 in the direction LD parallel to the long side FL of the film 4. The first light-shielding region 411 and the second light-shielding region 412 have a second width W2 in the direction LD. The distance D between the center of the first light-emitting element 21 and the center of the second light-emitting element 22 is greater than or equal to the sum of the first width W1 and the second width W2, and less than or equal to twice the sum of the first width W1 and the second width W2. That is, (W1 + W2) ≤ D ≤ (W1 + W2) × 2. As long as at least one region of the backlight module 1 includes one or more of the various light-emitting element distribution modes that meet the foregoing conditions, the number of LEDs can be reduced while maintaining the brightness uniformity; and the larger the region, the more the number of LEDs is reduced.
[0024] In order to enable those skilled in the art to fully understand the present invention, Figures 3 to 5 three light-emitting element distribution modes that meet the foregoing conditions are illustrated, Figure 1 It is illustrated that most of the middle region of the backlight module 1 includes the foregoing three light-emitting element distribution modes, and more than one light-emitting element is provided in each single-key light-transmitting region in most of the peripheral regions of the backlight module 1. However, Figure 1 , Figures 3 to 5 It is not intended to limit the present invention. Those skilled in the art can design various light-emitting element distribution modes in the backlight module under the foregoing conditions, and these all fall within the scope of protection of the present invention.
[0025] The first light-emitting element distribution mode of the present invention is as Figure 3As shown. The first light-emitting element 21 is disposed corresponding to the first single-key light-transmitting area 401, and the second light-emitting element 22 is disposed corresponding to the second light-shielding area 412. The distance D between the center of the first light-emitting element 21 and the center of the second light-emitting element 22 is approximately 1.5 times the sum of the first width W1 and the second width W2. The light guide plate 3 has a first light guide area 31, a second light guide area 32, and a third light guide area 33 corresponding to the first single-key light-transmitting area 401, the second single-key light-transmitting area 402, and the third single-key light-transmitting area 403, respectively. The first light guide area 31, the second light guide area 32, and the third light guide area 33 all have microstructures. The first through hole 301 is located in the first light guide area 31. The first light-emitting element 21 is located in the first through hole 301, that is, in the first light guide area 31. In this embodiment, the first through hole 301 and the first light-emitting element 21 are located at the center of the first light guide area 31, but it is not limited thereto. The second through hole 302 is located between the second light guide area 32 and the third light guide area 33. The second light-emitting element 22 is located in the second through hole 302, that is, between the second light guide area 32 and the third light guide area 33. In this embodiment, the distance between the center of the second through hole 302 and the second light guide area 32 is equal to the distance between the center of the second through hole 302 and the third light guide area 33, and the distance between the center of the second light-emitting element 22 and the second light guide area 32 is equal to the distance between the center of the second light-emitting element 22 and the third light guide area 33, but it is not limited thereto. The first light guide area 31 is located in the middle area of the illumination range C1 of the first light-emitting element 21. The third light guide area 33 is located in the right area of the illumination range C2 of the second light-emitting element 22. The second light guide area 32 is located in the left area of the illumination range C2 of the second light-emitting element 22, and a part of the second light guide area 32 is located in the right area of the illumination range C1 of the first light-emitting element 21. That is, the overlapping part of the illumination range C1 and the illumination range C2 covers a part of the second light guide area 32. Furthermore, the brightness of the illumination range C1 gradually decreases from the center of the illumination range C1 (i.e., where the first light-emitting element 21 is located) to the outside, and the brightness of the illumination range C2 gradually decreases from the center where the second light-emitting element 22 is located to the outside. Considering the above factors comprehensively, the microstructure density of the third light guide area 33 can be designed to be greater than the microstructure density of the second light guide area 32, and the microstructure density of the second light guide area 32 can be designed to be greater than the microstructure density of the first light guide area 31, so that the brightness of the first light guide area 31, the second light guide area 32, and the third light guide area 33 is substantially consistent. In addition, considering that the brightness of the illumination range C1 gradually decreases from the center of the illumination range C1 to the outside, the microstructures in the first light guide area 31 can be designed to become denser from the center of the first light guide area 31 to the outside (not shown in the figure), so that the brightness of each part of the first light guide area 31 is substantially consistent. Furthermore, considering that the brightness of the illumination range C2 gradually decreases from the center of the illumination range C2 to the outside, the microstructures in the third light guide area 33 can be designed to become denser from the left side to the right side of the third light guide area 33 (not shown in the figure), so that the brightness of each part of the third light guide area 33 is substantially consistent.Alternatively, it is also possible to consider whether each part of the second light guide area 32 is covered by the illumination range C1 and / or C2, and its position within the illumination range C1 and / or C2, to design the microstructure density (not shown in the figure) of each part of the second light guide area 32, so that the brightness of each part of the second light guide area 32 is substantially consistent.
[0026] The second light-emitting component distribution mode of the present invention is as Figure 4As shown. The first light-emitting element 21 is disposed corresponding to the first light-shielding region 411, and the second light-emitting element 22 is disposed corresponding to the second light-shielding region 412. The distance D between the centers of the first light-emitting element 21 and the second light-emitting element 22 is approximately the sum of the first width W1 and the second width W2. The light guide plate 3 has a first light guide region 31, a second light guide region 32, and a third light guide region 33 corresponding to the first single-button light-transmitting region 401, the second single-button light-transmitting region 402, and the third single-button light-transmitting region 403, respectively. The first through hole 301 is located between the first light guide region 31 and the second light guide region 32. The first light-emitting element 21 is located within the first through hole 301, that is, between the first light guide region 31 and the second light guide region 32. In this embodiment, the distance between the center of the first through hole 301 and the first light guide region 31 is equal to the distance between the center of the first through hole 301 and the second light guide region 32, and the distance between the center of the second light-emitting element 22 and the first light guide region 31 is equal to the distance between the center of the second light-emitting element 22 and the second light guide region 32, but is not limited thereto. The second through hole 302 is located between the second light guide region 32 and the third light guide region 33. The second light-emitting element 22 is located within the second through hole 302, that is, between the second light guide region 32 and the third light guide region 33. In this embodiment, the distance between the center of the second through hole 302 and the second light guide region 32 is equal to the distance between the center of the second through hole 302 and the third light guide region 33, and the distance between the center of the second light-emitting element 22 and the second light guide region 32 is equal to the distance between the center of the second light-emitting element 22 and the third light guide region 33, but is not limited thereto. The first light guide region 31 is located in the left region of the illumination range C1 of the first light-emitting element 21. The third light guide region 33 is located in the right region of the illumination range C2 of the second light-emitting element 22. The second light guide region 32 is located in the right region of the illumination range C1 and the left region of the illumination range C2 at the same time. In order to make the brightness of the first light guide region 31, the second light guide region 32, and the third light guide region 33 substantially consistent, the microstructure density of the second light guide region 32 can be designed to be less than the microstructure density of the first light guide region 31 and the microstructure density of the third light guide region 33, and the microstructure density of the first light guide region 31 can be designed to be substantially equal to the microstructure density of the third light guide region 33. In addition, the microstructure in the first light guide region 31 can be designed to gradually become denser from the right side to the left side of the first light guide region 31 (not shown in the figure) so that the brightness of each part of the first light guide region 31 is substantially consistent. Furthermore, the microstructure in the third light guide region 33 can be designed to gradually become denser from the left side to the right side of the third light guide region 33 (not shown in the figure) so that the brightness of each part of the third light guide region 33 is substantially consistent. Also, the microstructure density of each part of the second light guide region 32 can be designed (not shown in the figure) considering the position of each part of the second light guide region 32 within the illumination ranges C1 and C2 so that the brightness of each part of the second light guide region 32 is substantially consistent.
[0027] The third distribution manner of the light-emitting elements of the present invention is as Figure 5As shown. The first light-emitting element 21 is disposed corresponding to the first single-button light-transmitting area 401, and the second light-emitting element 22 is disposed corresponding to the third single-button light-transmitting area 403. The distance D between the center of the first light-emitting element 21 and the center of the second light-emitting element 22 is approximately twice the sum of the first width W1 and the second width W2. The light guide plate 3 has a first light guide area 31, a second light guide area 32, and a third light guide area 33 corresponding to the first single-button light-transmitting area 401, the second single-button light-transmitting area 402, and the third single-button light-transmitting area 403, respectively. The first through hole 301 is located in the first light guide area 31. The first light-emitting element 21 is located in the first through hole 301, that is, located in the first light guide area 31. In this embodiment, the first through hole 301 and the first light-emitting element 21 are located at the center of the first light guide area 31, but it is not limited thereto. The second through hole 302 is located in the third light guide area 33. The second light-emitting element 22 is located in the second through hole 302, that is, located in the third light guide area 33. In this embodiment, the second through hole 302 and the second light-emitting element 22 are located at the center of the third light guide area 33, but it is not limited thereto. The first light guide area 31 is located in the middle area of the illumination range C1 of the first light-emitting element 21. The third light guide area 33 is located in the middle area of the illumination range C2 of the second light-emitting element 22. A part of the second light guide area 32 is located in the right area of the illumination range C1 of the first light-emitting element 21, and a part is located in the left area of the illumination range C2 of the second light-emitting element 22. The overlapping part of the illumination range C1 and the illumination range C2 covers a part of the second light guide area 32. In order to make the brightness of the first light guide area 31, the second light guide area 32, and the third light guide area 33 substantially consistent, the microstructure density of the second light guide area 32 can be designed to be greater than the microstructure density of the first light guide area 31 and the microstructure density of the third light guide area 33, and the microstructure density of the first light guide area 31 can be designed to be substantially equal to the microstructure density of the third light guide area 33. In addition, the microstructure in the first light guide area 31 can be designed to gradually become denser from the center of the first light guide area 31 to the outside (not shown in the figure) so that the brightness of each part of the first light guide area 31 is substantially consistent. Furthermore, the microstructure in the third light guide area 33 can be designed to gradually become denser from the center of the third light guide area 33 to the outside (not shown in the figure) so that the brightness of each part of the third light guide area 33 is substantially consistent. Also, considering the positions of the parts of the second light guide area 32 in the illumination ranges C1 and C2, the microstructure density of each part of the second light guide area 32 can be designed (not shown in the figure) so that the brightness of each part of the second light guide area 32 is substantially consistent.
[0028] In any light-emitting component distribution mode of the present invention, any part of the second single-key light-transmitting area 402 is covered by the illumination range C1 of the first light-emitting component 21 and / or the illumination range C2 of the second light-emitting component 22. Therefore, no light-emitting component needs to be provided in the second single-key light-transmitting area 402. Therefore, compared with the prior art in which at least one LED is provided corresponding to each single key, by adopting any light-emitting component distribution mode of the present invention in any area of the backlight module 1 including three single-key light-transmitting areas 40, at least one LED can be reduced to reduce costs, and the brightness uniformity of the backlight module 1 is not changed.
[0029] In Figures 3 to 5 , the illumination ranges C1 of the first light-emitting component 21 and C2 of the second light-emitting component 22 are represented by dashed circles, but the dashed circles are not the actual boundaries of the illumination ranges C1 and C2. The dashed circles are only used to generally represent the ranges that the light emitted by the first light-emitting component 21 and the second light-emitting component 22 can reach. In addition, according to the types and shapes of the first light-emitting component 21 and the second light-emitting component 22, the illumination ranges C1 and C2 can also be other shapes. Please refer to Figure 6 , in some embodiments, when the light-emitting component 20 is rectangular, the illumination range C of the light-emitting component 20 is slightly elliptical. Please refer to Figure 1 , the number of single-key light-transmitting areas 40 in a row of single-key light-transmitting areas 40 parallel to the long side FL of the film 4 is greater than the number of single-key light-transmitting areas 40 in a column of single-key light-transmitting areas 40. Therefore, compared with the long side LL of the light-emitting component 20 being parallel to the long side CL of the circuit board 2, the long side LL of the light-emitting component 20 being perpendicular to the long side CL of the circuit board 2 can make the illumination range C cover a larger area of the single-key light-transmitting areas 40 on both the left and right sides of the light-emitting component 20, thereby improving the light utilization rate of the light-emitting component 20 (please refer to Figure 2 and Figure 6 ).
[0030] Please refer to Figure 7 , in some embodiments, a reflective portion 46 is provided on the surface of the film 4 facing the light guide plate 3. The reflective portion 46 corresponds to the light-emitting component 20 and is used to reflect the light emitted upward by the light-emitting component 20 to the light guide plate 3 to increase the light utilization rate and prevent bright spots from being generated at the light-emitting component 20. In some embodiments, when the projection of the light-emitting component 20 on the film 4 is located within the single-key light-transmitting area 40, the film is further provided with a light-shielding portion 47. The light-shielding portion 47 is located between the reflective portion 46 and the film 4 and corresponds to the light-emitting component 20 to further prevent bright spots from being generated at the light-emitting component 20. The area of the reflective portion 47 can be greater than or equal to the area of the light-shielding portion 46. The light-emitting component 20 can be the first light-emitting component 21 or the second light-emitting component 22.
[0031] Several embodiments have been described in detail above so that those skilled in the art can fully understand the concept of the present invention. The foregoing embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention. That is to say, the foregoing embodiments are not intended to limit the present invention. Those of ordinary skill in the art can modify the technical solutions in the foregoing embodiments or perform equivalent replacements for one or more of the technical features, and these modifications or equivalent replacements should all be included within the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the appended patent application scope.
Claims
1. A backlight module, characterized in that, Comprising: A circuit board having a first light-emitting component and a second light-emitting component; A light guide plate disposed on the circuit board and having a first through hole and a second through hole, wherein the first light-emitting component is received in the first through hole and the second light-emitting component is received in the second through hole; and A film disposed on the light guide plate and having a first single-key light-transmitting area, a second single-key light-transmitting area, and a first light-shielding area, wherein the first light-shielding area is located between the first single-key light-transmitting area and the second single-key light-transmitting area, the second single-key light-transmitting area is located between the first light-emitting component and the second light-emitting component, and there is no light-emitting component between the first light-emitting component and the second light-emitting component; Wherein, the first single-key light-transmitting area and the second single-key light-transmitting area have a first width in a direction parallel to one long side of the film, the first light-shielding area has a second width in this direction, and the distance between the center of the first light-emitting component and the center of the second light-emitting component is greater than or equal to the sum of the first width and the second width and less than or equal to twice the sum of the first width and the second width.
2. The backlight module according to claim 1, wherein, The film further has a second light-shielding area, the second single-key light-transmitting area is located between the first light-shielding area and the second light-shielding area, the first light-emitting component is disposed corresponding to the first single-key light-transmitting area, and the second light-emitting component is disposed corresponding to the second light-shielding area.
3. The backlight module according to claim 2, characterized in that, The film further has a third single-key light-transmitting area, the second light-shielding area is located between the second single-key light-transmitting area and the third single-key light-transmitting area, the light guide plate has a first light guide area, a second light guide area, and a third light guide area corresponding to the first single-key light-transmitting area, the second single-key light-transmitting area, and the third single-key light-transmitting area respectively, the microstructure density of the third light guide area is greater than the microstructure density of the second light guide area, and the microstructure density of the second light guide area is greater than the microstructure density of the first light guide area.
4. The backlight module according to claim 1, wherein The film further has a second light-shielding area, the second single-key light-transmitting area is located between the first light-shielding area and the second light-shielding area, the first light-emitting component is disposed corresponding to the first light-shielding area, and the second light-emitting component is disposed corresponding to the second light-shielding area.
5. The backlight module according to claim 4, wherein The film further has a third single-key light-transmitting area, the second light-shielding area is located between the second single-key light-transmitting area and the third single-key light-transmitting area, the light guide plate has a first light guide area, a second light guide area, and a third light guide area corresponding to the first single-key light-transmitting area, the second single-key light-transmitting area, and the third single-key light-transmitting area respectively, the microstructure density of the second light guide area is less than the microstructure density of the first light guide area and the microstructure density of the third light guide area, and the microstructure density of the first light guide area is substantially equal to the microstructure density of the third light guide area.
6. The backlight module according to claim 1, wherein The film further has a second light-shielding area and a third single-key light-transmitting area, the second single-key light-transmitting area is located between the first light-shielding area and the second light-shielding area, the second light-shielding area is located between the second single-key light-transmitting area and the third single-key light-transmitting area, the first light-emitting component is disposed corresponding to the first single-key light-transmitting area, and the second light-emitting component is disposed corresponding to the third single-key light-transmitting area.
7. The backlight module according to claim 6, wherein The light guide plate has a first light guide area, a second light guide area, and a third light guide area corresponding to the first single-key light-transmitting area, the second single-key light-transmitting area, and the third single-key light-transmitting area respectively. The microstructure density of the second light guide area is greater than the microstructure density of the first light guide area and the microstructure density of the third light guide area, and the microstructure density of the first light guide area is substantially equal to the microstructure density of the third light guide area.
8. The keyboard backlight module according to claim 1, wherein, One surface of the film facing the light guide plate is provided with a light reflecting portion, and the light reflecting portion corresponds to the first light emitting element.
9. The keyboard backlight module according to claim 8, wherein, When the projection of the first light emitting element on the film is located within the first single-key light-transmitting area, the film is further provided with a light shielding portion, and the light shielding portion is located between the light reflecting portion and the film and corresponds to the first light emitting element.
10. The keyboard backlight module according to claim 1, characterized in that, A long side of the first light emitting element is perpendicular to a long side of the circuit board.