A micro LED keyboard backlight module

Abstract

The utility model discloses a micro LED keyboard backlight module, a plurality of groups of parallel micro LED lamp groups and electrode lead-out end for connecting power supply are provided on FPC lamp plate, each group micro LED lamp group contains 2-3 micro LED lamp beads, a plurality of groups of micro LED lamp groups are connected with electrode lead-out end electricity after parallel, and the FPC lamp plate is provided with the light transmission hole corresponding to micro LED lamp group one by one, and the aperture of light transmission hole adapts the light emitting area of micro LED lamp group. Micro LED adopts common negative design, and the heat dissipation is better, and the low -power consumption drive of micro LED, same keyboard backlight module size, under the condition of same power consumption, can design more LED quantity, makes whole backlight module light efficiency more uniform. Increase the illumination range of micro LED quantity design also will increase, can cancel the design of original light guide plate, and the product thickness will also be made thinner.

Description

Technical Field

[0001] This utility model relates to the field of keyboard technology, specifically a micro LED keyboard backlight module. Background Technology

[0002] Currently, most keyboard backlight modules use mini LED solutions, with LED beads measuring 0.8mm × 0.4mm and a maximum power consumption of 10mW per single color. Due to size and power consumption limitations, each key typically has only one LED, resulting in a small illumination range. This necessitates the use of a light guide plate for light diffusion, increasing module thickness and causing uneven brightness between the key edges and center due to light loss. Furthermore, traditional LED modules have dispersed cathodes, leading to low heat dissipation efficiency and easy light decay. The circuitry uses an independent resistor for each LED, resulting in a large number of resistors, significant power loss, and overall system failure in the series circuit, leading to high repair costs. Utility Model Content

[0003] In order to overcome the shortcomings of existing technical solutions, this utility model provides a micro LED keyboard backlight module, which can effectively solve the problems mentioned in the background technology.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A micro LED keyboard backlight module includes:

[0006] The FPC light board has several sets of parallel micro LED light groups and electrode leads for connecting to the power supply. Each set of micro LED light groups contains 2-3 micro LED beads. The sets of micro LED light groups are connected in parallel and electrically connected to the electrode leads. The FPC light board has light-transmitting holes that correspond one-to-one with the micro LED light groups. The aperture of the light-transmitting holes is adapted to the light-emitting area of ​​the micro LED light groups.

[0007] The light-shielding film is laminated to the FPC lamp panel with adhesive, and the non-transparent area of ​​the light-shielding film (10) is printed with black ink to block light.

[0008] As a further description of the above technical solution, the size of the micro LED bead is ≤0.3mm×0.3mm, and the maximum luminous power consumption of a single color of a single micro LED bead does not exceed 6mW.

[0009] As a further description of the above technical solution, the micro LED lamp group adopts a common cathode structure.

[0010] As a further description of the above technical solution, each group of micro LED lamps is equipped with a voltage divider resistor, and all micro LED lamps are connected in parallel through the voltage divider resistors and then connected to the electrode leads.

[0011] As a further description of the above technical solution, each keyboard key is provided with at least one set of the micro LED light groups in the corresponding area of ​​the FPC light board, and each set of the micro LED light groups includes at least two micro LED beads.

[0012] As a further description of the above technical solution, the light-shielding film covers the non-light-emitting area and the periphery of the micro LED lamp group, and the light-shielding film is used to block the light from adjacent micro LED lamp groups from passing through and to protect the micro LED lamp beads.

[0013] As a further description of the above technical solution, the light-emitting direction of the light-transmitting hole is perpendicular to the FPC light panel, so that the light from the micro LED light group is directly emitted to the keyboard key area through the light-transmitting hole.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] The micro LED keyboard backlight module of this utility model has at least one of the following beneficial effects during use:

[0016] Firstly, the multiple parallel LED groups (each group with 2-3 LEDs) on the FPC light board eliminate the need for a traditional light guide plate through light superposition, significantly reducing the module thickness while covering the entire keyboard area and solving the problem of uneven lighting in traditional single-LED solutions. Secondly, the micro LEDs have a maximum single-color power consumption of ≤6mW, reducing the overall power consumption of the module, extending laptop battery life, and their small size also supports high-density arrangement. Thirdly, the LED groups adopt a common cathode structure, which concentrates heat dissipation to reduce local overheating, extends the life of the LEDs, and reduces pins and wiring, reducing the risk of failure. The grouped voltage divider resistors reduce power loss and ensure that a fault only affects a single group, facilitating maintenance. Fourthly, the light-shielding film can block light crosstalk between adjacent LED groups and protect the LEDs from dust and external forces, extending their lifespan. The vertical light-transmitting holes allow light to be emitted directly, reducing light loss and further improving light efficiency, fully meeting the requirements of ultra-thin, low-power, and high-reliability keyboard backlighting. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the LED light group layout structure of a micro LED keyboard backlight module according to the present invention.

[0018] Figure 2This is a schematic diagram of the FPC light board structure of a micro LED keyboard backlight module according to this utility model;

[0019] Figure 3 This is a partial structural diagram of a micro LED keyboard backlight module according to the present invention.

[0020] Numbering on the map:

[0021] 10. Light-blocking film; 11. Adhesive; 20. Micro LED light assembly; 21. Micro LED beads; 30. FPC light board; 31. Light-transmitting hole. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] like Figure 1-3 As shown, this utility model provides a micro LED keyboard backlight module, characterized in that it includes:

[0024] The FPC light board 30 has several sets of parallel micro LED light groups 20 and electrode leads for connecting to the power supply. Each set of micro LED light groups 20 includes 2-3 micro LED beads 21. The several sets of micro LED light groups 20 are connected in parallel and electrically connected to the electrode leads. The FPC light board 30 has light-transmitting holes 31 that correspond one-to-one with the micro LED light groups 20. The aperture of the light-transmitting holes 31 is adapted to the light-emitting area of ​​the micro LED light groups 20.

[0025] The FPC light board 30 is the core supporting component: it integrates "several groups of parallel micro LED light clusters", each group containing 2-3 micro LED beads 21; after all the light clusters are connected in parallel, they are connected to an external power supply through "electrode leads", ensuring that each group of light clusters is independently powered and the voltage is stable; at the same time, the FPC light board 30 has "one-to-one corresponding light transmission holes 31" for each light cluster, the aperture of which is adapted to the light-emitting area of ​​the light cluster, allowing only the light from the light cluster to pass through. By using multiple light clusters (2-3 beads per cluster), the illumination range is expanded, eliminating the need for a light guide plate to conduct light, and directly reducing the overall thickness of the module. By increasing the density of LED beads to cover the entire keyboard area, the problem of uneven illumination in traditional mini LEDs (1 LED per key) is solved.

[0026] A light-shielding film 10 is laminated to the FPC lamp board 30 by adhesive 11. The non-transparent areas of the light-shielding film 10 are printed with black ink to block light.

[0027] The module adopts a layered structure of "light-shielding film 10-adhesive 11-FPC light board 30". The adhesive 11 is used to achieve a stable bond between the light-shielding film 10 and the FPC light board 30, ensuring a compact overall structure. The "non-light-transmitting hole 31 area" of the light-shielding film 10 is printed with black ink, and light transmission channels are reserved only at the corresponding positions of the light assembly. After power is applied, the micro LED beads emit light, and the light is directionally emitted through the light-transmitting hole 31 of the FPC light board 30, while the non-light-emitting areas are blocked by black ink to prevent disordered light diffusion.

[0028] Furthermore, the micro LED bead 21 has a size of 0.8mm × 0.4mm, and the maximum luminous power consumption of a single micro LED bead 21 in a single color does not exceed 6mW.

[0029] LEDs can be densely arranged on the FPC light board 30: The flexible substrate of the FPC light board 30 can be adapted to the mounting requirements of small-sized LEDs, and the size design is compatible with the layout of "2-3 LEDs per group", avoiding mutual squeezing between LEDs.

[0030] Each micro LED bead has a maximum power consumption of no more than 6mW per color. This low power consumption allows for an increase in the number of LEDs (e.g., two LEDs per key) without changing the total power consumption of the module, enabling stable operation without upgrading the power driver module. This directly reduces the overall power consumption of the keyboard backlight module, extending the battery life of laptops and other devices.

[0031] Micro LED chips are smaller than traditional light sources, allowing for the arrangement of more LED clusters within a limited 30mm area of ​​an FPC light board. This provides a spatial basis for "single-button multi-LED" designs, thereby expanding the illumination range. The 6mW power consumption of a single chip reduces local heat accumulation, preventing chip light decay or FPC substrate aging caused by high temperatures, and providing a synergistic effect for subsequent heat dissipation optimization of the "common cathode structure".

[0032] Furthermore, the micro LED light assembly adopts a common cathode structure.

[0033] All the LEDs in each micro LED group share a single cathode pin, while the anode pins are connected to voltage divider resistors via circuitry. After an external power supply is connected through the electrode leads, current flows from the anode into the LED and out through the common cathode, forming a complete circuit.

[0034] The common cathode structure concentrates the cathodes of the lamp assembly onto the same conductive path, which can be directly connected to the grounding layer or heat dissipation area of ​​the FPC lamp board 30. Compared to the traditional structure of "independent cathodes for each lamp chip," this reduces the resistance loss of the current loop and concentrates the heat from multiple lamp chips to the heat dissipation area of ​​the FPC, avoiding localized overheating caused by heat dispersion. This solves the problem of low heat dissipation efficiency caused by cathode dispersion in traditional multi-lamp assemblies, extending the lifespan of the lamp chips.

[0035] A shared cathode reduces the number of pins and circuit nodes, lowering the risk of faults such as poor contact and cold solder joints. Simultaneously, the centralized cathode path ensures consistent grounding potential across all groups of LEDs, preventing uneven brightness due to potential differences and guaranteeing the stability of the lamp assembly. The shared cathode structure eliminates the need for an independent cathode circuit for each LED, reducing the amount of wiring on the FPC lamp board 30, saving substrate space, and further supporting the arrangement of "high-density lamp assemblies."

[0036] To further explain, each micro LED group is equipped with a voltage divider resistor, and all micro LED groups are connected in parallel through the voltage divider resistors to the electrode leads.

[0037] Each micro LED group is connected in series with a voltage divider resistor, and all the LED groups with resistors are then connected in parallel to the electrode leads. The external power supply voltage is stepped down by the voltage divider resistors to provide a stable operating voltage (matching the rated voltage of the micro LED) to the corresponding LED group. At the same time, the resistors limit the current to prevent the LEDs from burning out due to excessive current. Reducing the number of resistors can reduce the total resistance loss of the circuit and further optimize the energy efficiency of the module.

[0038] The parallel structure allows each group of lamps to operate independently: if one group of lamps or the voltage divider resistor fails, only that group stops illuminating, without affecting the operation of other groups; and the voltage of each group is consistent, ensuring uniform brightness across all groups (avoiding the problem of a single lamp failing and causing the entire group to go out in a series circuit). The voltage divider resistor provides independent voltage / current protection for each group, preventing overcurrent damage to the lamps due to power supply voltage fluctuations; and the parallel structure ensures consistent voltage across groups, solving the problem of uneven brightness caused by "high voltage division for the front lamp and low voltage division for the rear lamp" in a series circuit.

[0039] The grouped design simplifies fault location (only the voltage divider resistors corresponding to the faulty lamp group need to be checked), eliminating the need to replace the entire circuit and reducing the cost and difficulty of later maintenance.

[0040] Furthermore, each keyboard key has at least one set of micro LED lights in the corresponding area on the FPC light panel 30, and each set of micro LED lights includes at least two micro LED beads.

[0041] The layout of the FPC light board 30 corresponds one-to-one with the physical position of the keyboard keys: at least one micro LED light group is arranged in the area below each key (corresponding to the position of the light-transmitting hole 31 on the iron plate), and each light group contains at least 2 LED beads to ensure that the light-emitting area of ​​the light group completely covers the key area.

[0042] The illumination range of a single micro LED is limited, but "at least two LEDs per group" can expand the illumination coverage of a single button area by superimposing the light between the LEDs, so that the brightness of the entire button area can be uniform without relying on a light guide plate.

[0043] By superimposing the illumination range, it directly covers the entire area of ​​the button, completely replacing the "light transmission + diffusion" function of the light guide plate. Through multi-point illumination, the brightness difference between the edge and center of the button is greatly reduced, solving the problem of blind spots in traditional solutions.

[0044] Furthermore, the light-shielding film 10 covers the non-light-emitting area and periphery of the micro LED lamp group, and the light-shielding film 10 is used to block the light from adjacent micro LED lamp groups from passing through and to protect the micro LED lamp beads.

[0045] The light-shielding film 10 is adhered to the surface of the FPC light board 30 using adhesive 11. An opening is reserved only in the "light-emitting area of ​​the micro LED group" (aligned with the FPC light-transmitting hole 31), while the remaining areas (non-light-emitting surfaces of the LEDs, FPC wiring areas, and gaps between LED groups) are completely covered by the light-shielding film 10. It prevents light penetration: the black oil layer of the light-shielding film 10 blocks more than 99% of light, preventing light from adjacent LED groups from interpenetrating (e.g., red light from one LED group mixing into the blue light group area), thus preventing color difference. The light-shielding film 10 provides a physical barrier for the LEDs, preventing dust and moisture from directly contacting the LED pins (preventing oxidation and rust), while also buffering external impacts (e.g., slight vibrations from keyboard presses), protecting the LED packaging structure, and reducing the risk of LEDs falling off due to vibration.

[0046] By precisely covering the light-shielding film 10, the problem of "color crosstalk between adjacent buttons" in the traditional solution without light-shielding film 10 is avoided (such as local yellowing / blueing of white backlight).

[0047] Furthermore, the light-emitting direction of the light-transmitting hole 31 is perpendicular to the FPC light panel 30, so that the light from the micro LED light group is directly emitted to the keyboard key area through the light-transmitting hole 31.

[0048] The light-transmitting hole 31 of the FPC light board 30 is a "vertical through hole", that is, the axis of the hole is perpendicular to the surface of the FPC light board 30; the light emission direction of the micro LED beads is consistent with the axis of the light-transmitting hole 31. After being powered on, the light passes through the light-transmitting hole 31 in a vertical direction and shines directly on the bottom of the keyboard keys (light-transmitting hole 31 of the key iron plate), without needing to be refracted or reflected by the light guide plate.

[0049] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

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