LED keyboard backlight module

Abstract

The invention relates to the technical field of keyboard backlight modules, solves the technical problems that a traditional keyboard backlight module is large in LED lamp demand number, high in raw material cost, large in power consumption, complex in design and insufficient in light emitting brightness, and particularly relates to an LED keyboard backlight module which comprises an LED keyboard backlight module body composed of a backlight module body and a key position module body. The backlight module comprises a plurality of lamp position distribution areas arranged on the FPC lamp panel in proportion, light-emitting modules for providing backlight for the key position module are arranged on the lamp position distribution areas, and an LGP light guide piece with the upper surface flush with the upper surfaces of the light-emitting modules is bonded to the FPC lamp panel. According to the keyboard backlight module, the number of LEDs of a traditional keyboard backlight module is reduced to 10-90 from original 90-300, the cost of the LEDs is greatly reduced, the production efficiency is greatly improved accordingly, the effects of reducing power consumption, reducing the number of the LEDs and improving the overall brightness are achieved, and the design difficulty of the whole module is simplified.

Description

Technical Field

[0001] The invention relates to the technical field of keyboard backlight modules, and in particular to an LED keyboard backlight module. Background Art

[0002] The main feature of the notebook backlight keyboard module is that the characters on the keyboard keys glow, so that the characters on the keys can be clearly seen even without turning on the lights at night, allowing users to work anytime and anywhere at night, and the keyboard glows softly and feels comfortable. The conventional keyboard backlight module circuit design usually installs a positive LED light under each key. This conventional design solution on the market requires a very large number of LED lights to be installed, and the power consumption of the laptop battery is extremely high, resulting in high keyboard module costs, and the computer standby time is greatly shortened when working on the road. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides an LED keyboard backlight module, which solves the technical problems of traditional keyboard backlight modules, such as large number of LED lamps required, high raw material costs, high power consumption, complex design and insufficient luminous brightness.

[0004] To solve the above technical problems, the present invention provides the following technical solutions: an LED keyboard backlight module, comprising an LED keyboard backlight module composed of a backlight module and a key position module, the backlight module comprising a plurality of light position distribution areas arranged in proportion on an FPC light board, a light emitting module providing backlight for the key position module is arranged on the light position distribution area, an LGP light guide sheet whose upper surface is flush with the upper surface of the light emitting module is bonded to the FPC light board, a light guide grid point located directly below the center of the key position module is arranged on the LGP light guide sheet, and a light shading reflective layer is coated on the LGP light guide sheet so that the light emitted by the light emitting module is focused and refracted on the light guide grid point.

[0005] Furthermore, the setting ratio of the lamp position distribution area is the number of lamp positions: the number of key caps is equal to 1:2-4.

[0006] Furthermore, the light-shielding reflective layer is formed by printing the whitening ink at least 1 to 10 times.

[0007] Furthermore, the light-emitting module includes an FPC window area and an FPC soldering pad arranged on the FPC lamp board, and the FPC soldering pad is located in the FPC window area, and a refractive layer is printed on the FPC window area to refract the optical fiber in all directions, an LED soldering pad is welded on the FPC soldering pad, and an LED lamp group is welded on the LED soldering pad, and the upper surface of the LED lamp group is covered with a reflective layer to enable it to emit light in all directions.

[0008] Furthermore, the refractive layer is white ink printed in the FPC window area.

[0009] Furthermore, the reflective layer is a layer of 1 to 50 micrometers of white reflective material covering the top light-emitting surface of the LED lamp group.

[0010] Furthermore, the LGP light guide sheet includes an upper area contour close to the upper edge of the FPC light board, and the upper area contour is provided with an indented area for refracting light overflowing from the edge near the top row of keycaps of the keyboard.

[0011] Furthermore, the key module comprises an eagle hook iron plate fixed on the backlight module, the eagle hook iron plate is equipped with a key control soft board MEM, the key control soft board MEM is installed with scissor feet, and the scissor feet are detachably connected with keycaps.

[0012] Furthermore, the light guide points are distributed in a 1:1 morphology of the holes on the eagle hook iron plate.

[0013] By means of the above technical solution, the present invention provides an LED keyboard backlight module, which has at least the following beneficial effects:

[0014] 1. The present invention achieves the effect of reducing power consumption, reducing the number of LEDs and improving the overall brightness by systematically adjusting the LED packaging method, the lamp position and circuit layout of the FPC lamp board and the surface treatment of the lamp board, as well as the light guide point distribution of the LGP and the reflectivity of the shading reflective film and the extraction rate of the LED brightness, and simplifies the design difficulty of the entire module.

[0015] 2. The present invention reduces the number of LEDs in the traditional keyboard backlight module from 90 to 300 to 10 to 90, which greatly reduces the LED cost and greatly improves the production efficiency. The light source adopts CSP LED lamp. Due to the reduction in the number of LEDs used, its power consumption and heat generation are lower, which is more conducive to computer heat dissipation, thereby improving the brightness of a single lamp and the comprehensive effective utilization rate of the brightness, and improving the battery life of the computer.

[0016] 3. The present invention not only enhances the side luminous intensity of the LED lamp group itself and optimizes the FPC lamp board, but also optimizes the distribution of light guide points on the LGP light guide sheet, thereby increasing the brightness of the keycaps, so as to achieve the effect that one LED lamp group 136 illuminates 2 to 4 keycaps. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1It is a structural explosion diagram of the keyboard backlight module in the present invention;

[0019] Figure 2 This is a comparison diagram before and after the optimization of the number of light-emitting modules on the FPC light board in the present invention;

[0020] Figure 3 It is a structural schematic diagram of the FPC lamp board in the present invention;

[0021] Figure 4 It is a structural schematic diagram of a conventional light-emitting module of the present invention;

[0022] Figure 5 It is a structural schematic diagram of the light-emitting module in the present invention;

[0023] Figure 6 It is a structural schematic diagram of the LED lamp group in the present invention;

[0024] Figure 7 This is a comparison diagram of the LED light group before and after optimization in the present invention;

[0025] Figure 8 is a schematic diagram of a light guide point of the present invention;

[0026] Fig. 9 Schematic diagram of the outer contour of the LGP light guide sheet in the present invention;

[0027] Fig.10 Schematic diagram of the LGP light guide sheet before and after optimization in the present invention;

[0028] Fig.11 It is a schematic diagram of the power consumption test in the present invention.

[0029] In the figure:

[0030] 1. Backlight module; 11. FPC light board; 12. Light distribution area;

[0031] 13. Light-emitting module; 131. FPC window area; 132. Refraction layer; 133. FPC solder pad; 134. LED solder pad; 135. LED lamp group; 136. Reflective layer;

[0032] 14. LGP light guide; 141. upper area outline; 142. indented area;

[0033] 15. Light-guiding mesh points; 16. Light-shielding reflective layer;

[0034] 2. Key position module; 21. Eagle hook iron plate; 22. Key control soft board MEM; 23. Scissor foot; 24. Key cap. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0036] In the traditional keyboard backlight module, the structure from the bottom to the surface of the key is: FPC backlight board (including 1:1 keycap number of light positions, pads and windows without white ink coating combined with conventional five-sided LED lights) → LGP light guide in the conventional keyboard industry → anti-reflection film → keyboard stainless steel iron plate → key control soft board MEM → scissor feet → keycap. However, the traditional keyboard backlight module has a very large demand for the number of LED lights installed, and the power consumption of the laptop battery is extremely high, resulting in high cost of keyboard modules, and the computer standby time is greatly shortened during travel office.

[0037] In order to solve the shortcomings of keyboard backlight module, such as large number of LED lamps required, high raw material cost, high power consumption, complex design and insufficient brightness, please refer to Figure 1-Figure 10 This embodiment proposes an LED keyboard backlight module, which achieves the effect of reducing power consumption, reducing the number of LEDs and improving the overall brightness by systematically adjusting the LED packaging method, the light position and circuit layout of the FPC light board and the surface treatment of the light board, as well as the distribution of the light guide points of the LGP and the reflectivity of the light-shielding reflective film and the extraction rate of the LED brightness, and simplifies the design difficulty of the entire module. Among them, the LED keyboard backlight module is composed of a backlight module 1 and a key position module 2, and the key position module 2 includes an eagle hook iron plate 21 fixed on the backlight module 1, and the eagle hook iron plate 21 is equipped with a key control soft board MEM22, and the key control soft board MEM22 is installed with a scissor foot 23, and the scissor foot 23 is detachably connected with a key cap 24.

[0038] like Figure 1 As shown, the backlight module 1 includes a plurality of light position distribution areas 12 arranged on the FPC light board 11 in proportion, and the arrangement ratio of the light position distribution area 12 is the number of light positions: the number of key caps is equal to 1:2-4, and a light emitting module 13 is arranged on the light position distribution area 12 to provide backlight for the key position module 2, as shown in FIG. Figure 2 and Figure 3 As shown, compared with the current keyboard backlight module (before optimization), the light distribution area 12 proposed in this embodiment can be greatly reduced, reducing the original number of LED lights from 90 to 300 PCS to within 10 to 90 PCS (after optimization). The conventional module is that each keycap corresponds to an LED. After the improvement, every 2 keycaps or 3 to 4 keycaps share 1 LED. By lighting up the LED all around (360° left and right, up and down), the LED is placed in the middle of 2 to 4 keycaps to reduce the number of LEDs used.

[0039] like Figure 4 As shown, the conventional FPC light board has a yellow or black area where the window is exposed to expose the substrate, so as to achieve the effect of light absorption. In the present invention, Figure 5 As shown, by printing white ink on the area of ​​the FPC light board where the window is opened to expose the substrate, the light refraction around the LED is improved. The actual verification effect shows that the overall brightness of the LED can be effectively increased from the original 100% to about 150%. The light-emitting module 13 includes an FPC window area 131 and an FPC soldering pad 133 arranged on the FPC light board 11, and the FPC soldering pad 133 is located in the FPC window area 131. A refraction layer 132 is printed on the FPC window area 131 to refract the optical fiber to the surroundings. The refraction layer 132 is white ink printed in the FPC window area 131, which has a better reflective effect. An LED soldering pad 134 is welded on the FPC soldering pad 133, and an LED lamp group 135 is welded on the LED soldering pad 134. The LED lamp group 135 uses a CSP LED lamp.

[0040] Since in the traditional structure, one keycap corresponds to one LED, the LED is designed to emit light from five sides, such as Figure 7 As shown in the conventional five-sided LED in the figure. However, in the present invention, 2 to 4 keycaps share one LED, so four-sided light emission is adopted and effective refraction of light is used to ensure the brightness of the keycaps on both sides. In order to reduce the loss of light on the upper part of the conventional LED lamp, the LED is subjected to secondary mold processing so that the top light-emitting surface of the LED is covered with a layer of 1 to 50 microns of white reflective material. Figure 6 As shown, the present invention covers the upper surface of the LED lamp group 135 with a reflective layer 136 that emits light in all directions. The reflective layer 136 is a layer of 1 to 50 microns of white reflective material covering the top light-emitting surface of the LED lamp group 135. By changing the conventional five-sided light emission (ordinary positive light emission) to a four-sided light emission through the reflective layer 136, the side light emission intensity of LEDs with the same brightness can be effectively increased by 20 to 80%.

[0041] Considering that multiple keycaps share one LED, the distribution of the light guide points 15 on the LGP light guide sheet 14 is optimized while enhancing the side luminous intensity of the LED light group 135 and optimizing the FPC light board 11. Figure 8As shown, in order to achieve the effect that one LED light group 135 finally illuminates 2 to 4 keycaps. Specifically, an LGP light guide sheet 14 whose upper surface is flush with the upper surface of the light-emitting module 13 is bonded to the FPC light board 11, and a light guide grid 15 located directly below the center of the key module 2 is arranged on the LGP light guide sheet 14. The light guide grid 15 is distributed in a 1:1 morphology according to the holes on the eagle hook iron plate 21. The function of the light guide grid 15 is to focus and refract the light of the LED light group 135 to form a light spot on the light guide grid 15, thereby increasing the brightness of the keycap. It is a point arrangement program designed by optical software. The program is imported into a high-precision laser machine laser on a mirror material, and is printed on the material of the optical film through a hot pressing process to form a luminous LGP, which guides the LED light intensity to the surrounding distance and effectively refracts to the LGP surface, greatly improving the brightness of the entire backlight module 1.

[0042] The LGP light guide plate 14 is coated with a shading reflective layer 16 that focuses and refracts the light emitted by the light emitting module 13 onto the light guide dots 15. The shading reflective layer 16 is formed by printing at least 1 to 10 times with whitening ink. The whiteness of the white ink of the light shading reflective layer 16 is increased by whitening the white ink itself or by printing multiple times from 1 to 10 times, thereby further improving the utilization rate of light. The backlight module 1 after the lamp is reduced can maintain the comprehensive backlight effect of the conventional module with 50% to 80% of the power consumption and 10 to 90 LEDs.

[0043] like Fig. 9 and Fig.10 As shown, in order to improve the luminous brightness of the top row of small keycaps of ESC, F1 to F12, and to meet the overall keyboard backlight uniformity requirements, the contour of the top area of ​​the LGP light guide 14 is optimized, and the brightness overflowing from the edge of the light guide is fully utilized to be refracted to the keycaps. Specifically, the LGP light guide 14 includes an upper area contour 141 close to the upper edge of the FPC light board 11, and the upper area contour 141 is provided with an indented area 142 near the top row of keycaps of the keyboard to refract the brightness overflowing from the edge.

[0044] The present invention performs brightness tests on the keyboard backlight module before and after optimization, and the test results are shown in Table 1.

[0045] Table 1 Brightness test results

[0046]

[0047]

[0048] From the brightness test results in Table 1, it can be seen that the keyboard backlight module proposed by the present invention has a significantly higher average brightness than the traditional backlight module, with excellent minimum and maximum brightness, as the number of LEDs is reduced from 90 to 300 to 10 to 90.

[0049] At the same time, this embodiment also performs power consumption test on the keyboard backlight module before and after optimization, such as Fig.11 As shown in the current power consumption test, the total current was 110mA before optimization and 70mA after optimization. Compared with before optimization, the power consumption was significantly reduced, thereby reducing the heat of the computer and improving the battery life of the computer.

[0050] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the above embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments.

[0051] The above implementation methods have been described in detail. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. An LED keyboard backlight module, comprising a backlight module (1) and a key module (2), characterized in that: The backlight module (1) comprises a plurality of light position distribution areas (12) arranged in proportion on an FPC light board (11); a light emitting module (13) for providing backlight for a key module (2) is arranged on the light position distribution area (12); an LGP light guide sheet (14) whose upper surface is flush with the upper surface of the light emitting module (13) is bonded to the FPC light board (11); a light guide grid point (15) located directly below the center of the key module (2) is arranged on the LGP light guide sheet (14); and a light shielding reflective layer (16) is coated on the LGP light guide sheet (14) for focusing and refracting light emitted by the light emitting module (13) onto the light guide grid point (15).

2. The LED keyboard backlight module according to claim 1, characterized in that: The setting ratio of the light position distribution area (12) is the number of light positions: the number of key caps, which is equal to 1:2-4.

3. The LED keyboard backlight module according to claim 1, characterized in that: The light-shielding reflective layer (16) is formed by printing the whitening ink at least 1 to 10 times.

4. The LED keyboard backlight module according to claim 1, characterized in that: The light-emitting module (13) comprises an FPC window area (131) and an FPC soldering pad (133) arranged on an FPC lamp board (11), wherein the FPC soldering pad (133) is located in the FPC window area (131), a refraction layer (132) is printed on the FPC window area (131) for causing the optical fiber to refract in all directions, an LED soldering pad (134) is welded on the FPC soldering pad (133), and an LED lamp group (135) is welded on the LED soldering pad (134), and the upper surface of the LED lamp group (135) is covered with a reflective layer (136) for causing the LED lamp group (135) to emit light in all directions.

5. The LED keyboard backlight module according to claim 4, characterized in that: The refractive layer (132) is white ink printed in the FPC window area (131).

6. The LED keyboard backlight module according to claim 4, characterized in that: The reflective layer (136) is a layer of white reflective material with a thickness of 1 to 50 micrometers covering the top light-emitting surface of the LED lamp group (135).

7. The LED keyboard backlight module according to claim 1, characterized in that: The LGP light guide sheet (14) comprises an upper area contour (141) close to the upper edge of the FPC light board (11); the upper area contour (141) is provided with an indented area (142) close to the top row of keycaps of the keyboard for refracting light overflowing from the edge.

8. The LED keyboard backlight module according to claim 1, characterized in that: The key position module (2) comprises an eagle hook iron plate (21) fixedly mounted on the backlight module (1), a key control soft board MEM (22) being mounted on the eagle hook iron plate (21), a scissor foot (23) being mounted on the key control soft board MEM (22), and a key cap (24) being detachably connected to the scissor foot (23).

9. The LED keyboard backlight module according to claim 8, characterized in that: The light-guiding network points (15) are distributed in a 1:1 morphology according to the holes on the eagle-hook iron plate (21).

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