Keyboard backlight module adopting destructive structure and capable of preventing light leakage
By opening the front side through groove and the bottom side through groove on the light guide film, printing the shading ink and filling the shading glue, the light leakage and thickness problems of the keyboard backlight module are solved, achieving a thinner and more efficient luminous effect.
Patent Information
- Application Number
- CN202421280265.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-06
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2034-06-06
AI Technical Summary
Existing keyboard backlight modules are prone to light leakage during the luminescence process, and the reflective film is convex, resulting in the module being thicker and does not conform to the thinner design.
The destructive structure is used to open the front side through groove and the bottom side through groove on the light guide film, and the shading ink is printed and filled with the light shielding glue is used to prevent light leakage on the side of the light guide film, while avoiding the reflection film being convex. The module thickness increases.
It effectively prevents light leakage on the side of the light guide film, reduces the thickness of the module, makes the keyboard backlight module thinner, and improves the luminous efficiency.
Smart Images
Figure CN222530285U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of backlight modules, and more specifically, particularly relates to a keyboard backlight module which adopts a destructive structure to prevent light leakage. Background Art
[0002] The current keyboard backlight module consists of a light-shielding film, a light-guiding film, a reflective film, and a light source on the FPC circuit board from top to bottom. The light source is composed of multiple small LED lamps and is laid on the FPC circuit board. The FPC circuit is turned on to light up the LED lamp, and the light-guiding film concentrates the light emitted by the LED lamp, which is then transmitted and scattered by the light-guiding film to emit light to the key area. In addition, the light-shielding film is arranged above the light-guiding film, and a light-transmitting window is arranged at each corresponding light-transmitting keycap. The reflective film is arranged below the light-guiding film. The light transmitted inside the light-guiding film is reflected by the reflective film and emitted to the corresponding light-transmitting keycap through each light-transmitting window, so that the light-transmitting characters on the keycap can emit light.
[0003] The existing keyboard backlight module is prone to light leakage during the light emission process. As the light guide component, how to shield the light leakage of the light guide film is a problem that has been discussed in the industry. The existing solution to the light leakage problem of the light guide film is mainly to emboss the reflective film, and the shading film and the reflective film are sealed and covered, and the light guide film is sandwiched between the reflective film and the shading film to prevent light leakage from the side of the light guide film. However, since the reflective film is embossed, a certain pressure is applied to it during the keyboard pressing process, and the expansion of the embossed part causes the reflective film and the shading film to come apart at the bonding point, causing light leakage from the side of the light guide film. In addition, the embossed reflective film will make the backlight module thicker, which does not conform to the lightweight design of the keyboard and cannot meet user needs.
[0004] Therefore, in view of this, the existing structure and defects are studied and improved, and a keyboard backlight module with a destructive structure to prevent light leakage is provided, in order to achieve a more practical purpose. Summary of the invention
[0005] In order to solve the above technical problems, the utility model provides a keyboard backlight module which adopts a destructive structure to prevent light leakage, so as to solve the problems in the prior art that the side of the light guide film is easy to leak light and the keyboard backlight module is not thin enough when in use.
[0006] The purpose and effect of the keyboard backlight module of the utility model which adopts a destructive structure to prevent light leakage are achieved by the following specific technical means:
[0007] A keyboard backlight module adopting a destructive structure to prevent light leakage comprises: a light shielding film, a light guide film, a reflective film, an FPC circuit board, and an LED lamp, wherein the light shielding film is provided with a plurality of white ink light transmission areas, the reflective film is provided directly below the light shielding film, the light guide film is located between the light shielding film and the reflective film, a plurality of LED lamps are provided below the reflective film, and the LED lamps are laid on the FPC circuit board;
[0008] A front through groove is provided downwardly on the front side of the light-guiding film, and a bottom through groove is provided upwardly on the bottom side of the light-guiding film. The bottom surface of the front through groove and the top surface of the bottom through groove are in the same horizontal plane. The front through groove and the bottom through groove are offset up and down and spaced left and right to correspond to each other. The front through groove and the bottom through groove are formed at the edge of the light-guiding film in a destructive manner. Light-shielding ink is printed on the inner side walls of the front through groove and the bottom through groove, and light-shielding glue is filled in the front through groove and the bottom through groove.
[0009] Furthermore, a light-shielding ink layer is provided at the edge of the light-shielding film and the reflective film, and the positions of the light-shielding ink layer and the front side through groove and the bottom side through groove correspond to each other. The light-shielding film and the reflective film are bonded together with the light-guiding film by light-shielding glue.
[0010] Furthermore, the light-shielding film, the light-guiding film and the reflective film are provided with heat dissipation holes corresponding to each other, and the light-shielding film is also provided with a black ink layer except for the white ink light-transmitting area.
[0011] Furthermore, a white ink layer is printed on the front side of the reflective film, and a light-shielding black ink is printed on the bottom side, and a light-shielding ink layer located at the edge of the reflective film is printed on the white ink layer.
[0012] Furthermore, a plurality of lamp holes are correspondingly formed on the shading film and the reflecting film, and LED lamps located on the FPC circuit board are embedded in the lamp holes.
[0013] Furthermore, the FPC circuit board is in the shape of an elongated strip, the LED lamps at both ends of the FPC circuit board are located in the area surrounded by the light-shielding ink layer, and the bottom of the LED lamp is surrounded by an ink light-shielding layer located on the FPC circuit board.
[0014] Compared with the prior art, the utility model has the following beneficial effects.
[0015] By opening the front side through groove and the bottom side through groove on the light guide film in a destructive way, the side space of the light guide film is fully utilized, and the problem of thick backlight module caused by convex reflective film is avoided, making the keyboard backlight module thinner and lighter. At the same time, light-shielding ink is printed and light-shielding glue is filled in the front side through groove and the bottom side through groove, which effectively solves the problem that the convex reflective film easily causes the light-shielding film and the reflective film to separate and leak light during the keyboard key pressing process, and effectively prevents light leakage from the side of the light guide film. This setting meets the design of thin and light-weight backlight module, and fully utilizes the luminous efficiency of LED lamps to improve the luminous effect of keyboard backlight module. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 The utility model is a stereoscopic diagram of a keyboard backlight module which adopts a destructive structure to prevent light leakage.
[0017] Figure 2 It is a three-dimensional diagram of the light-guiding film of the utility model.
[0018] Figure 3 It is a three-dimensional cross-sectional view of the light-guiding film of the utility model.
[0019] Figure 4 yes Figure 2 A local enlarged structural diagram of the A
[0020] Figure 5 This is a front view of the light-guiding film of the utility model.
[0021] Figure 6 This is a bottom view of the light-guiding film of the utility model.
[0022] Figure 7 It is a front view of the shading film of the utility model.
[0023] Figure 8 It is a bottom view of the light-shielding film of the utility model.
[0024] Fig. 9 It is a front view of the reflective film of the utility model.
[0025] Fig.10 It is a bottom view of the reflective film of the utility model.
[0026] Fig.11 It is a structural schematic diagram of the FPC circuit board of the utility model.
[0027] In the figure, the corresponding relationship between the component names and the figure numbers is as follows:
[0028] 1. Shading film; 2. Light-guiding film; 3. Reflective film; 4. FPC circuit board; 5. LED lamp; 6. Front side through groove; 7. Bottom side through groove; 8. White ink light-transmitting area; 9. Shading glue; 10. Shading ink layer; 11. Heat dissipation hole; 12. Black ink layer; 13. White ink layer; 14. Shading black ink; 15. Lamp hole; 16. Ink shading layer. DETAILED DESCRIPTION
[0029] The following is a further detailed description of the implementation of the present utility model in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model.
[0030] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0032] Example:
[0033] As attached Figure 1 To Attachment Fig.11 As shown:
[0034] A keyboard backlight module adopting a destructive structure to prevent light leakage comprises: a shading film 1, a light guide film 2, a reflective film 3, an FPC circuit board 4, and an LED lamp 5. The shading film 1 is provided with a plurality of white ink light-transmitting areas 8, and the white ink light-transmitting areas 8 correspond to the perspective areas of the luminous characters of the keyboard key caps. The shading film 1 blocks the light emitted by the LED lamp 5, so that the light is emitted from the white ink light-transmitting areas 8, illuminating the luminous characters of the keyboard, and facilitating the user to recognize the keyboard characters at night. The reflective film 3 is arranged directly below the shading film 1, and the reflective film 3 reflects the light emitted by the LED lamp 5, so that the keyboard characters can be easily recognized by the user at night. It propagates on the light-guiding film 2, which is located between the light-shielding film 1 and the reflecting film 3. The light-guiding film 2 has light-guiding points, which can convert point light sources into surface light sources, fully utilize the light energy of the LED lamp 5, and reduce its loss. A number of LED lamps 5 are arranged below the reflecting film 3, and the LED lamps 5 are laid on the FPC circuit board 4, which is attached to the center position below the reflecting film 3. This arrangement allows the light emitted by the LED lamps 5 on the FPC circuit board 4 to be evenly distributed on the light-guiding film 2, fully utilizing the light effect, so that the keyboard backlight module emits light more evenly;
[0035] A front through groove 6 is provided downwardly on the front side of the light guide film 2, and the front through groove 6 can block light leakage from the upper half of the side of the light guide film 2. A bottom through groove 7 is provided upwardly on the bottom surface of the light guide film 2, and the bottom through groove 7 can block light leakage from the lower half of the side of the light guide film 2. The bottom surface of the front through groove 6 and the top surface of the bottom through groove 7 are in the same horizontal plane, and the light shielding surface of the front through groove 6 and the bottom through groove 7 is exactly equal to the side of the light guide film 2. The front through groove 6 and the bottom through groove 7 are offset up and down, and the left and right intervals are arranged to correspond to each other, so that The front side through groove 6 and the bottom side through groove 7 can evenly divide the side surface and the upper and lower light shielding surfaces of the light guide film 2. The front side through groove 6 and the bottom side through groove 7 are opened at the edge of the light guide film 2 in a destructive manner. Since the light guide film 2 is relatively thin, the conventional cutting method can no longer meet the groove opening accuracy. Now, a high-precision destructive method is used to realize the groove opening. Specifically, the front side through groove 6 and the bottom side through groove 7 are realized by laser burning, mold hot melting, etching, etc., and the inner walls of the front side through groove 6 and the bottom side through groove 7 are printed with The light-shielding ink is brushed to achieve light shielding on the side of the edge of the light-guiding film 2, and the front side through groove 6 and the bottom side through groove 7 are filled with light-shielding glue 9. The filling of the light-shielding glue 9 achieves light shielding on the top and bottom of the edge of the light-guiding film 2. At the same time, the light-guiding film 2 can be bonded together with the edge of the reflective film 3 and the light-shielding film 1, avoiding increasing the thickness of the backlight module by printing a layer of glue, and achieving the light-thinning of the light-guiding module. Specifically, the front side through groove 6 and the bottom side through groove 7 are opened on the light-guiding film 2 in a destructive manner, so as to fully By utilizing the side space at the edge of the light-guiding film 2, the problem of thicker backlight module caused by embossing the reflective film 3 is avoided, making the keyboard backlight module thinner and lighter. At the same time, light-shielding ink is printed and light-shielding glue 9 is filled in the front side groove 6 and the bottom side groove 7, which effectively solves the problem of light leakage at the bonding point between the light-shielding film 1 and the reflective film 3 caused by the embossing of the reflective film 3 during keyboard key pressing. Light leakage from the side of the light-guiding film 2 is effectively prevented, making the keyboard backlight module thinner and lighter, while improving the luminous effect of the keyboard backlight module.
[0036] Among them, a light-shielding ink layer 10 is arranged at the edge of the light-shielding film 1 and the reflective film 3, and the positions of the light-shielding ink layer 10 and the front side through groove 6 and the bottom side through groove 7 correspond to each other. The light-shielding ink layer 10 can effectively prevent the light transmitted by the light-guiding film 2 from diverging to the side, and prevent the light leakage from the side of the light-shielding film 1 and the reflective film 3. The light-shielding film 1 and the reflective film 3 are bonded together with the light-guiding film 2 by the light-shielding glue 9. The setting of the light-shielding glue 9 allows the light-guiding film 2 to be tightly bonded to the light-shielding film 1 and the reflective film 3 respectively at the top and bottom, saving space and eliminating the need to print another layer of glue, thereby realizing the thinness of the keyboard backlight module.
[0037] Among them, the light-shielding film 1, the light-guiding film 2 and the reflective film 3 are provided with heat dissipation holes 11 corresponding to each other. The heat dissipation holes 11 can assist the light-guiding film 2 in dissipating heat to prevent excessive temperature from affecting the overall light-guiding efficiency of the keyboard backlight film group. The light-shielding film 1 is also provided with a black ink layer 12 except for the white ink light-transmitting area 8. The black ink layer 12 can block the light on the light-guiding film 2 and allow it to be fully emitted from the white ink light-transmitting area 8, thereby making full use of light energy and improving the overall luminous effect of the keyboard backlight module.
[0038] Among them, a white ink layer 13 is printed on the front of the reflective film 3, and the white ink layer 13 can reflect the light emitted by the LED lamp 5, allowing it to be fully transmitted on the light guide film 2. The bottom surface is printed with a light-shielding black ink 14 to block the light emitted by the LED lamp 5 and avoid light scattering, making full use of the light emitted by the LED lamp 5 to improve the overall light effect. A light-shielding ink layer 10 located at the edge of the reflective film 3 is printed on the white ink layer 13. The light-shielding ink layer 10 is printed on the white ink layer 13 to avoid the light scattered by the reflective film 3 from diverging from the edge, prevent light leakage from the side of the reflective film 3, and improve the luminous efficiency of the keyboard backlight module.
[0039] Among them, a plurality of lamp holes 15 are correspondingly opened on the shading film 1 and the reflecting film 3, and the LED lamp 5 located on the FPC circuit board 4 is embedded in the lamp hole 15. The setting of the lamp hole 15 enables the reflecting film 3 to reflect the light emitted by the LED lamp 5 as much as possible. The light guide film 2 can effectively utilize the light energy emitted by the LED lamp 5, and maximize the utilization of the light emitted by the LED lamp 5. At the same time, the embedded setting saves the space thickness of the LED lamp 5, meeting the lightweight design of the keyboard backlight module.
[0040] Among them, the FPC circuit board 4 is in the shape of a long strip, and the LED lamps 5 at both ends of the FPC circuit board 4 are located in the area circled by the light-shielding ink layer 10. In order to make the light-guiding film 2 fully absorb the light energy emitted by the LED lamp 5 and avoid the LED lamp 5 being partially located on the light-shielding ink layer 10 and excessively wasting the light energy of the low beam of the LED lamp 5, an ink light-shielding layer 16 located on the FPC circuit board 4 is provided around the bottom of the LED lamp 5. The ink light-shielding layer 16 prevents light leakage from the bottom of the LED lamp 5, makes full use of the light emitted by the LED lamp 5, and further improves the overall luminous effect of the keyboard backlight module.
[0041] The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.
Claims
1. A keyboard backlight module adopting a destructive structure to prevent light leakage, characterized in that: include: A light shielding film (1), a light guiding film (2), a reflective film (3), an FPC circuit board (4), and an LED lamp (5), wherein the light shielding film (1) is provided with a plurality of white ink light-transmitting areas (8), the reflective film (3) is provided directly below the light shielding film (1), the light guiding film (2) is located between the light shielding film (1) and the reflective film (3), a plurality of LED lamps (5) are provided below the reflective film (3), and the LED lamps (5) are laid on the FPC circuit board (4); The front surface of the light-guiding film (2) is provided with a front side through groove (6) facing downward, and the bottom surface of the light-guiding film (2) is provided with a bottom side through groove (7) facing upward. The bottom surface of the front side through groove (6) and the top surface of the bottom side through groove (7) are in the same horizontal plane. The front side through groove (6) and the bottom side through groove (7) are offset up and down and spaced apart from each other left and right. The front side through groove (6) and the bottom side through groove (7) are provided at the edge of the light-guiding film (2) in a destructive manner. The inner side walls of the front side through groove (6) and the bottom side through groove (7) are printed with light-shielding ink. The front side through groove (6) and the bottom side through groove (7) are filled with light-shielding glue (9).
2. The keyboard backlight module with a destructive structure to prevent light leakage according to claim 1, characterized in that: A light-shielding ink layer (10) is provided at the edges of the light-shielding film (1) and the reflective film (3); the positions of the light-shielding ink layer (10) and the front through groove (6) and the bottom through groove (7) correspond to each other; the light-shielding film (1) and the reflective film (3) are bonded together with the light-guiding film (2) by means of light-shielding glue (9).
3. The keyboard backlight module with a destructive structure to prevent light leakage according to claim 1, characterized in that: The shading film (1), the light-guiding film (2) and the reflecting film (3) are provided with heat dissipation holes (11) corresponding to each other, and the shading film (1) is also provided with a black ink layer (12) except for the white ink light-transmitting area (8).
4. The keyboard backlight module with a destructive structure to prevent light leakage according to claim 2, characterized in that: The reflective film (3) has a white ink layer (13) printed on the front surface and a light-shielding black ink (14) printed on the bottom surface; a light-shielding ink layer (10) located at the edge of the reflective film (3) is printed on the white ink layer (13).
5. The keyboard backlight module with a destructive structure to prevent light leakage according to claim 1, characterized in that: A plurality of lamp holes (15) are correspondingly provided on the light shielding film (1) and the reflective film (3), and LED lamps (5) located on the FPC circuit board (4) are embedded in the lamp holes (15).
6. The keyboard backlight module with a destructive structure to prevent light leakage according to claim 2, characterized in that: The FPC circuit board (4) is in the shape of an elongated strip. The LED lamps (5) at both ends of the FPC circuit board (4) are located in the area encircled by the light-shielding ink layer (10). The bottom of the LED lamp (5) is surrounded by an ink light-shielding layer (16) located on the FPC circuit board (4).