Backlight key core module and notebook keyboard module

Abstract

The application relates to the technical field of integrating light source elements on a printed circuit board, and proposes a backlight key core module and a notebook keyboard module. The backlight key core module comprises a key unit and a backlight unit. The key unit comprises a supporting part and a light-transmitting part, and a key cap is fixed above the light-transmitting part through the supporting part. The backlight unit comprises a lateral light-emitting diode, a light guide plate and a base. The light guide plate is attached to the base and is arranged in parallel with the light emitted by the light-emitting diode. A protrusion is arranged on the light guide plate and corresponds to a through hole of the light-transmitting part, so as to guide the light to illuminate the key. The key core modules are arranged according to predetermined key positions to form the notebook keyboard module. Each backlight unit can be integrally connected or arranged with a gap and a sealing strip. The light-transmitting part can display translucent characters or symbols. By virtue of the modular structure, the ultrathin notebook keyboard can be uniformly backlit and designed to be light and thin. Each backlight key core module is an independent light-emitting key area and is driven by a driving circuit, so that each backlight key core module can realize the partition backlight effect.

Description

Technical Field

[0001] This application relates to the technical field of integrating light source elements on printed circuit boards, and more particularly to a backlit key core module and a keyboard module for laptops. Background Technology

[0002] With the increasing demand for thinner, lighter, and higher-quality user experiences in laptops, especially ultrabooks, backlit keyboards have become standard. Current laptop backlit keyboards typically use a top-down lighting method, with the LED light source of the backlight module usually located below the keyboard base, guiding the light to the keys through a light-transmitting film or light guide plate. However, this traditional structure has several problems:

[0003] On the one hand, to achieve uniform backlighting, the backlight module typically includes a three-layer structure of a light-shielding film, a light guide plate, and a reflective film, which, combined with direct-lit LEDs, forms a relatively thick stack, resulting in an increase in the overall keyboard thickness and hindering the design of ultra-thin laptops. On the other hand, the backlight structure of existing keyboard modules is usually a single piece or a fixed connection, lacking modular design, making it difficult to achieve independent light adjustment of key units and convenient maintenance or replacement. In addition, relying on the synergistic effect of the reflective film and the light guide plate to guide the light direction, if the reflective film and the light guide plate are not designed properly, it can easily cause uneven brightness or light leakage.

[0004] Therefore, current technologies cannot simultaneously achieve the thinness, modularity, and manufacturability required for ultra-thin laptops while ensuring uniform backlighting and key brightness. Consequently, a new backlit key core module and keyboard module are needed to solve these technical problems. Summary of the Invention

[0005] This application addresses the needs of ultra-thin laptops for slimness, uniform backlighting, and modular keyboard design, providing a backlit key core module and a keyboard module for the laptop. By optimizing the light guide plate structure and backlight layout, this application achieves the goals of reduced keyboard thickness, uniform light distribution, and modular key design.

[0006] This application provides a backlit key module, which includes at least one key unit and a backlight unit. The key unit includes a keycap, a support portion, and a light-transmitting portion. The keycap is fixed above the light-transmitting portion by the support portion, ensuring stable support for the key and forming a light outlet. The keycap is made of a biodegradable material. The backlight unit includes at least one side-emitting diode (LED), a light guide plate, and a base. The side-emitting LED is disposed on the sidewall of the base, and the light guide plate is disposed on the propagation path of the light emitted from the side-emitting LED, parallel to the light propagation direction. By forming bumps on the light guide plate, with the bumps corresponding to the through holes of the light-transmitting portion, the light emitted from the side-emitting LED is efficiently guided to the light-transmitting portion, achieving uniform and controllable key brightness. The side-emitting LED includes a light-emitting chip with at least one wavelength. Each backlit key module is an independent illuminated key area, driven separately by a driving circuit, enabling each backlit key module to achieve a zoned backlight effect.

[0007] Furthermore, the thickness of the light guide plate is no more than 0.4 mm, which facilitates the thinning of the overall keyboard module and is suitable for the design requirements of ultra-thin laptops. The bumps are hemispherical with a diameter controlled between 0.2 and 1 mm, which helps improve the light divergence angle and reduce uneven brightness and light leakage. At the same time, a light shield can be set above the light guide plate. The light shield has a hollow area with corresponding through holes, which can further limit the direction of light diffusion and improve the uniformity of backlight and visual comfort. In addition, side-emitting diodes are set on one side of the light guide plate, with their light-emitting surfaces facing the side surface of the light guide plate, so that light can enter from the side surface of the light guide plate in a forward direction, controlling the direction of light travel within the light guide plate and improving light utilization.

[0008] On the other hand, this application provides a keyboard module for a laptop, which consists of multiple sets of backlit key core modules arranged according to a predetermined key layout, each of which is the aforementioned backlit key core module. The light-transmitting portion can be equipped with semi-transparent characters or symbols to achieve visualization and aesthetic effects of the key content. The backlight units of each backlit key core module can adopt an integrated connection structure or have gaps, with sealing strips installed within the gaps to facilitate zoned backlight display, modular maintenance, and dust and liquid protection.

[0009] In summary, this application provides a backlight key module that meets the requirements of ultra-thin laptops while also taking into account uniform backlighting, modular design, and maintainability, as well as a keyboard module solution for laptops, which significantly improves the problems of large thickness, uneven brightness, and inconvenient maintenance in the prior art. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] in:

[0012] Figure 1 This is a cross-sectional view of the backlight key module provided in this embodiment of the technical solution;

[0013] Figure 2 yes Figure 1 A schematic diagram of the light-emitting principle of a side-mounted LED, light guide plate, and bumps;

[0014] Figure 3 This is a cross-sectional view of the keyboard module provided in this embodiment of the technical solution;

[0015] Figure 4 A top view of the identification characters on the keycaps is provided in a preferred embodiment;

[0016] Figure 5 This is a three-dimensional schematic diagram of the keyboard module provided in this embodiment of the technical solution;

[0017] Figure 6 A preferred embodiment provides a cross-sectional view of a keyboard module.

[0018] Explanation of main component symbols

[0019] Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] Please see Figure 1 The backlight key module 100 provided in this embodiment of the technical solution mainly includes at least one key unit 110 and a backlight unit 120.

[0022] The key unit 110 includes a keycap 113, a support portion 111, and a light-transmitting portion 112. The keycap 113 of the key unit 110 is fixed above the light-transmitting portion 112 by the support portion 111. In this embodiment, the keycap 113 can be made of a biodegradable material to enhance environmental friendliness and reduce the environmental burden caused by discarded keycaps 113. Specifically, the biodegradable material can be one or a combination of the following: (1) Bio-based polylactic acid (PLA): refined from renewable resources (such as corn starch, sugarcane, etc.) and has good mechanical strength. (2) Polyhydroxyalkanoate (PHA): has good thermal stability and flexibility. (3) Starch-based biodegradable plastic: by introducing natural starch particles into the polymer, the biodegradability of the material is improved. (4) Biodegradable composite material: a certain proportion of degradation additives or natural fibers are mixed into traditional thermoplastic resins (such as ABS, PC) so that they can degrade in the natural environment or under specific composting conditions after their service life. During the manufacturing process, the aforementioned biodegradable materials can be injection molded into the keycaps 113. While biodegradable materials (such as PLA and PHA) possess a certain degree of transparency or translucency, their light transmittance is generally lower than that of traditional optical resins such as polycarbonate (PC) and polymethyl methacrylate (PMMA). In other words, when the keycaps 113 are made of biodegradable materials, light transmission may result in reduced brightness, weakened color saturation, or uneven light transmission. Because biodegradable materials often contain natural fibers or starch particles, these non-uniformly distributed particles can cause scattering effects during light propagation, resulting in localized bright spots or diffused areas in the backlight display. Although this affects the overall uniformity of light emission, its diffused properties can be used to achieve a softer lighting effect in certain scenarios. Furthermore, since biodegradable materials naturally have lower light transmittance, they can better block light. In summary, while the keycaps 113 made of biodegradable materials are not as superior as traditional chemically synthesized materials in terms of light transmittance and moldability, they have significant advantages in terms of environmental protection and sustainability. Through reasonable structural optimization and process improvement, backlighting requirements can still be met while materials can be recycled and reused, enhancing the product's environmental friendliness and sustainability. Specifically, to make the overall design thinner, the support part 111 adopts a scissor-leg structure. Specifically, the scissor-leg structure includes a pair of cross-arranged support arms. One end of each support arm is fixed to the bottom of the keycap 113, and the other end is hinged to the light-transmitting part 112 or other elastic reset mechanism. When the user presses the keycap 113, the support arms of the scissor-leg structure can slide and tilt at the intersection point, thereby evenly transmitting the pressing force to the lower key switch while ensuring the stable horizontal movement of the keycap 113, preventing wobbling or tilting.The scissor-switch mechanism significantly reduces the overall height of the keys, allowing the backlit key module 100 to adapt to the thinness requirements of ultra-thin laptops. Its foldable support reduces reliance on traditional support pillars or ring-shaped support structures, freeing up more space for the backlight unit 120. Furthermore, the light-transmitting portion 112 has a through-hole 114, which is correspondingly located below the keycap 113 to form a light channel. The light-transmitting portion 112 is made of an opaque material, such as black or dark-colored engineering plastics (e.g., ABS, PBT, PA) or metal (e.g., aluminum alloy, stainless steel), to effectively block light transmission from non-through-hole areas, thus limiting light to only exiting from the through-hole 114 to the bottom of the keycap 113, preventing light leakage. Optionally, the size, shape, and position of the through-hole 114 can be optimized according to the design of the characters or symbols on the keycap 113. For example, the through-hole 114 can be circular, square, or other shapes, and its diameter or width can be between 0.5 mm and 1.5 mm to balance brightness and character clarity. After assembly, the light-transmitting part 112 can effectively block light except for the through-hole 114, allowing the backlight source to be concentrated in the area of ​​the through-hole 114, thereby improving the contrast and clarity of the backlight display.

[0023] The backlight unit 120 includes at least one side-emitting diode 121, a light guide plate 122, and a base 123. The side-emitting diode 121 is disposed on the side wall of the base 123. The light guide plate 122 is attached to the base 123 using an adhesive 130, and the light guide plate 122 is parallel to the light emitted from the side-emitting diode 121, that is, the light guide plate 122 is disposed on the light propagation path and parallel to the light propagation direction. Preferably, the adhesive 130 not only provides a fixed bonding effect between the light guide plate 122 and the base 123, ensuring the stability of the light guide plate 122 during assembly and use, but also allows the addition of reflective materials, such as reflective powder, metal particles, or high-refractive-index particles, to enhance the light reflection effect at the bottom of the light guide plate 122. Specifically, for example... Figure 2As shown, the side-emitting diode 121 can be disposed on one side of the light guide plate 122, such that the light-emitting surface of the side-emitting diode 121 can face the side surface 122a of the light guide plate 122, allowing the light emitted by the side-emitting diode 121 to propagate along the interior of the light guide plate 122. Specifically, the side surface 122a is substantially perpendicular to the base 123, meaning that the light emitted by the side-emitting diode 121 can enter the light guide plate 122 in a straight line along the side surface 122a, thereby allowing the light guide plate 122 to fully receive the light and minimizing the loss of incident light propagating between different interfaces. In one variation, the side surface 122a can have a small tilt angle of 1° to 10° to optimize the light coupling effect. That is, the angle between the side surface 122a and the base 123 can be controlled between 80° and 100°, so that the incident light can still be effectively coupled into the light guide plate 122 at different angles, thereby avoiding light energy loss due to total internal reflection. Specifically, the side-emitting diode 121 includes at least one wavelength light-emitting chip. In one embodiment, the side-emitting diode 121 can use a single-wavelength light-emitting chip and package multiple light-emitting chips of different wavelengths. The light-emitting chip can be any one of a blue light chip, a green light chip, or a red light chip. By using a single-wavelength chip, the circuit driving design can be simplified, while ensuring high luminous efficiency and low power consumption. In one variation, the side-emitting diode 121 can use multi-wavelength light-emitting chips integrated, that is, the light-emitting chip simultaneously includes chips of three different wavelengths: red (R), green (G), and blue (B), and integrated within the same package. Alternatively, in another variation, the side-emitting diode 121 can integrate at least one warm white light chip and at least one cool white light chip, and the emission ratio of different chips can be controlled by a driving circuit to achieve a variable color temperature effect. In other words, the side-emitting diode 121 is a variable color temperature light-emitting diode. Through the selection and configuration of different light-emitting chips, the side-emitting diode 121 can flexibly select a monochromatic light source or a multi-color adjustable light source according to actual needs, which not only improves optical coupling efficiency but also enriches the application scenarios of backlit keyboards. Optionally, the thickness of the light guide plate 122 can be no more than 0.4 mm to meet the requirements of ultra-thin laptops for keyboard thinness. In this embodiment, the light guide plate 122 is made of transparent or semi-transparent polycarbonate (PC), acrylic (PMMA), or other materials with a thickness of about 0.2~0.4 mm. The above thickness design can ensure the effective propagation and uniform distribution of light inside the light guide plate 122 while maintaining the ultra-thin structure of the overall backlit keyboard module 100. In addition, the light guide plate 122 has at least one bump 124, which corresponds to the through hole 114 of the light-transmitting part 112, and is used to guide the light emitted by the side-emitting diode 121 to the light-transmitting part 112.Specifically, the bump 124 can be hemispherical, with a diameter between 0.2 and 1 mm. The material of the bump 124 can also be the same as that of the light guide plate 122, such as transparent or translucent polycarbonate (PC) or acrylic (PMMA), and it is formed on the surface of the light guide plate 122 by screen printing or UV inkjet printing to maintain optical continuity and reduce light loss. Furthermore, the bump 124 formed in this manner not only accurately corresponds to the position of the through-hole 114, but also effectively reduces light scattering and leakage, enhancing brightness and uniformity. In this embodiment, the side-emitting diode 121 can be a monochrome RGB multi-color LED, and the emitting surface of the side-emitting diode 121 is in close contact with the side surface 122a of the light guide plate 122 to maximize the reduction of the distance between the emitting surface of the side-emitting diode 121 and the side surface 122a, ensuring efficient light coupling and reducing the stack thickness of the backlight unit 120.

[0024] In this embodiment, each backlit key module 100 is designed as an independent illuminated key area and is driven separately by a driving circuit, enabling each backlit key module 100 to achieve a zoned backlighting effect. Specifically, the so-called "independent illuminated key area" means that each backlit key module 100 can correspond to different key areas, such as: numeric keypad area, letter key area, function key area, etc., and each backlit key module 100 has an independent electrical interface, which can be individually controlled by the driving circuit. In addition to corresponding to different keys, it can also achieve independent illumination. Each backlit key module 100 can be connected to the driving circuit via terminals, and the driving circuit can individually control the brightness, color, and lighting sequence of each backlit key module 100. For example, in an RGB chip configuration, the red, green, and blue chips are all controlled by independent driving channels, thereby achieving multi-color mixing and dynamic lighting effects. Furthermore, by dividing multiple backlit key modules 100 into several key areas (such as numeric keypad areas, letter key areas, and function key areas), and managing and controlling them with the driving circuit, different key areas can display differentiated lighting effects in different scenarios. For example, in office mode, all key areas maintain a soft white light; in game mode, only the letter key area displays a high-brightness dynamic RGB lighting effect, while other areas remain low-brightness or off to highlight key operations. Additionally, when the side-emitting diode 121 is a variable color temperature diode, the driving circuit can adjust the color temperature of the side-emitting diode 121 according to the usage scenario. For example, in night mode, the side-emitting diode 121 can output a low color temperature warm light to reduce the stimulation of blue light components on the user's eyes and improve comfort during long-term use; in office mode, it outputs a neutral color temperature white light to ensure the clarity and readability of keyboard characters; in game mode, it can output a high-brightness cool light, and even combine with an RGB chip to achieve a stronger visual impact and immersive experience. In summary, RGB chips are more suitable for applications with strong demands for color display and lighting effects, focusing more on display quality. Dual-color-temperature chips, on the other hand, are more suitable for applications requiring visual comfort (such as office work, nighttime use, and eye protection), prioritizing user comfort. In one variation, the driving circuit can also be combined with a storage unit to allow users to personalize individual backlight key modules 100, such as specifying a target key with a particular color or setting a gradient mode. Through this design, each backlight key module 100 not only exists independently in physical structure but also achieves a high degree of independence in electrical and optical control, effectively supporting zoned backlighting effects and enhancing the keyboard's user experience and visual appeal.Understandably, night mode, office mode, and game mode can be input via a host computer. For example, users can input the mode on the laptop's interface using a mouse, and the laptop will transmit the input mode to the laptop's keyboard module. Alternatively, a separate key core module can be set up on the laptop's keyboard module to obtain any of the night mode, office mode, or game mode input by the user.

[0025] Furthermore, the backlight unit 120 may also include a light-shielding sheet 125 disposed above the light guide plate 122, the light-shielding sheet 125 having a hollow area 126 corresponding to the through hole 114. In this embodiment, the material of the light-shielding sheet 125 may be opaque polyimide (PI), polycarbonate (PC), or photoresist material, to effectively block light from the light guide plate 122 that has not been guided by the bump 124, preventing light from scattering to areas where light is not needed, thereby improving the uniformity of button brightness and reducing light leakage. The hollow area 126 actually acts as an optical window, used to limit light to only pass through a designated location. Specifically, when the light emitted from the side-emitting diode 121 first enters the light guide plate 122, it is refracted or scattered by the bump 124. When the light reaches the light-shielding sheet 125, only the light aligned with the hollow area 126 can pass through this area; the remaining light will be blocked by the light-shielding sheet 125, thereby limiting the path of the light. Secondly, the cutout area 126 and the through hole 114 are precisely aligned in position. When light passes through the cutout area 126, it can also accurately enter the through hole 114 to further penetrate to the bottom of the keycap 113. Optionally, the light-shielding sheet 125 is tightly attached to the upper surface of the light guide plate 122 and fixed by mechanical pressing, bonding, or hot pressing. The position of the cutout area 126 corresponds to the protrusion 124, ensuring that the light emitted by the side-emitting diode 121 is only conducted from the protrusion 124 through the through hole 114 to the bottom of the keycap 113, forming a high-contrast backlight display effect. Furthermore, the thickness of the light-shielding sheet 125 can be adjusted according to the backlight brightness requirements, for example, controlled within the range of 0.05~0.2 mm, to ensure the light-shielding effect without significantly increasing the overall thickness of the keyboard, thereby meeting the design requirements of ultra-thin laptops for lightness and thinness. By setting the light shield 125, the uniformity of light emission of the key can be improved, and it can also form a synergistic optical structure with the light guide plate 122, the bump 124 and the side-emitting diode 121 to realize an ultra-thin, modular backlight key module 100.

[0026] Please see Figure 3This embodiment of the technical solution provides a keyboard module 10 for a laptop, mainly comprising multiple sets of backlit key modules 100 arranged according to a predetermined key layout. In this embodiment, the keyboard module 10 may be a standard QWERTY (also known as a KOLIT keyboard or full keyboard) layout or other key arrangements suitable for ultra-thin laptops. Optionally, such as Figure 4 As shown, each keycap 113 can have an identification character 113a or symbol formed on it, allowing users to more clearly identify the corresponding function or letter, such as the English letter O. The backlight unit 120 of each backlit key module 100 can be integrally connected with the backlight unit 120 of adjacent backlit key modules 100, meaning the backlight unit 120 can form a continuous light guide layer to reduce optical gaps 140 and improve overall backlight uniformity. Furthermore, as... Figure 5 As shown, corresponding side-emitting diodes 121 can be provided on both sides of the base 123, so that the side-emitting diodes 121 can be located on opposite side surfaces 122a of the light guide plate 122, thereby enhancing the overall brightness and uniformity of the keyboard module 10.

[0027] Please see again Figure 6For key positions requiring physical isolation, a gap 140 can be provided between the backlight unit 120 of each backlight key module 100 and the backlight unit 120 of the adjacent backlight key module 100 to form an optical isolation area. To further prevent light leakage and scattering, a sealing strip 150 is provided in the gap 140. The sealing strip 150 can be made of a flexible, compressible elastic material, such as silicone, thermoplastic elastomer (TPE), or rubber, and is fixed between the edge of the light guide plate 122 and the base 123 by molding, injection molding, or bonding, so that it can fit tightly against the edge surface of the backlight key module 100 during assembly, thereby effectively blocking light from leaking from the side of the backlight key module 100 and ensuring the independent light-emitting effect of each backlight key module 100. In addition, during the assembly of the keyboard module 10, the sealing strip 150 can withstand a certain amount of mechanical compression, providing a buffer protection for each backlight key module 100 and preventing damage to the backlight unit 120. The sealing strip 150 installed within the gap 140 not only prevents light leakage but also provides dust and liquid protection. Specifically, the sealing strip 150 can be made of a material with good elasticity and chemical corrosion resistance, ensuring the keyboard remains sealed during long-term use and preventing deformation or damage due to pressure or temperature changes. The sealing strip 150 fits tightly against the edge of the light guide plate 122 and the base 123, forming a continuous sealing surface, thereby preventing dust, small particles, or liquids (such as water or beverages) from seeping into the keyboard and avoiding contamination or damage to the backlight unit 120. Through this design, each backlight key module 100 not only achieves optical isolation, ensuring independent and uniform light emission, but also effectively prevents dust and liquid in the laptop usage environment, improving the overall reliability and lifespan of the keyboard.

[0028] Specifically, since each backlit key module 100 is designed as an independent illuminated key area and driven separately by a driving circuit, each backlit key module 100 can achieve a zoned backlighting effect. Therefore, the keyboard module 10 of this application can configure different key areas with corresponding backlit key modules 100. For example, the key areas can be divided into: numeric keypad areas, letter key areas, function key areas, etc., so that each key area corresponds to a different backlit key module 100. Furthermore, the arrangement of the backlit key modules 100 can be fine-tuned according to the thickness of the laptop and the size of the keyboard, so that the entire keyboard module 10 can meet the requirements of thinness and lightness while still ensuring uniform backlight brightness and independent adjustment function of each backlit key module 100. In addition, the modular design of the backlit key module 100 of this application facilitates production assembly and subsequent maintenance. Users do not need to disassemble the entire keyboard when using or replacing it; they only need to replace or repair specific key areas. Through the above design, the keyboard module 10 of this application can meet the requirements of ultra-thin laptops, such as thinness, regional and uniform backlighting, and modular production.

[0029] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A backlight key core module, characterized in that, The backlight key module includes: At least one key unit, the key unit including a keycap, a support portion and a light-transmitting portion, the keycap being fixed above the light-transmitting portion by the support portion, and the keycap being made of a biodegradable material; and A backlight unit includes at least one side-emitting diode (LED), a light guide plate, and a base. The side-emitting diode is disposed on the side wall of the base. The light guide plate is attached to the base and positioned on the propagation path of the light emitted from the side-emitting diode, parallel to the direction of light propagation. The side-emitting diode includes a light-emitting chip of at least one wavelength. The side-emitting diode is disposed on one side of the light guide plate, and the light-emitting surface of the side-emitting diode faces the side surface of the light guide plate. The side surface is substantially perpendicular to the base, so that the light emitted from the side-emitting diode enters the light guide plate straight along the side surface. The light guide plate is attached to the base using an adhesive, and reflective material is added to the adhesive to enhance the light reflection effect at the bottom of the light guide plate. The light guide plate has at least one protrusion, which corresponds to the through hole of the light-transmitting part and is used to guide the light emitted by the side-emitting diode to the light-transmitting part. The protrusion is formed on the surface of the light guide plate. The backlight unit also includes a light shield disposed above the light guide plate, which has a hollow area corresponding to the through hole. Each backlight key module is an independent illuminated button area, driven by a separate driving circuit, enabling each backlight key module to achieve a zoned backlight effect. A gap exists between the backlight units of each backlight key module and the backlight units of adjacent backlight key modules. A sealing strip is installed within this gap to surround the backlight unit of each backlight key module. The sealing strip is made of elastic material and is fixed between the edge of the light guide plate and the base, allowing it to fit tightly against the edge surface of the backlight key module during assembly. This effectively blocks light leakage from the sides of the backlight key module, ensuring the independent illumination effect of each backlight key module.

2. The backlight key module as described in claim 1, characterized in that, The thickness of the light guide plate is no more than 0.4 mm.

3. The backlight key module as described in claim 2, characterized in that, The protrusion is hemispherical and its diameter is between 0.2 and 1 mm.

4. A keyboard module for a laptop, characterized in that, The keyboard module of the laptop includes multiple backlit key core modules arranged according to a predetermined key layout. Each backlit key core module is the backlit key core module as described in claim 1. Each backlit key core module is an independent light-emitting key area and is driven by a driving circuit to achieve a zoned backlight effect.

5. The keyboard module of the laptop as described in claim 4, characterized in that, The keycaps have semi-transparent identification characters or symbols.

Images