TWM534889U - Backlight module with membrane switch function - Google Patents

Description

Backlight module with membrane switch function

The present invention provides a backlight module with a membrane switch function, in particular, the reflective layer of the reflective film is a first circuit layer provided with a lower layer of the membrane switch, and a light guide plate is disposed on the first circuit layer as a middle layer and a light shielding layer. The second circuit layer of the upper layer of the film can be combined with a line integrated with the light source to simplify the structure to reduce the overall thickness of the whole.

According to the rapid development of today's electronic technology and information industry, various electronic products are moving toward light, thin, short, small and powerful trends, such as computers, notebook computers, mobile Internet devices (MIDs), smart phones, Tablet PCs, etc., have become indispensable electronic products for modern people in daily life or work, and most of the users and electronic products use mouse, keyboard and other input devices to communicate, and the keyboard is most convenient. Input operations for text, numbers, or commands, and enhance useful functions.

Furthermore, in order to enable the human eye to clearly see the symbols on each button in a low-light environment, a manufacturer introduces a light guide plate and a light source technology into the keyboard, and develops a backlit keyboard with a backlight module to make the backlight The light generated by the module can be projected onto the back of each keycap to form a backlight effect, so that the user can clearly see the symbol on the keycap for convenient operation, and the backlight keyboard currently on the market includes a button module. And a backlight module, wherein the backlight module has a light guide plate, and is provided with a flexible circuit board and a light emitting diode on one side surface of the light guide plate. a light-emitting unit, wherein the light-emitting unit projects light to the light guide plate to uniformly illuminate the light guide plate, and the lower surface of the light guide plate is provided with a reflective sheet that can reflect the light emitted from the lower surface of the light guide plate back to the light guide plate, and the surface of the light guide plate The light-shielding sheet corresponding to the button module is arranged to pass the light emitted by the light guide plate through the light-transmitting portion of the light-shielding sheet to the button module to form a backlight.

However, the button module at the top of the backlight module includes a bottom plate, a plurality of button units, a film circuit board and at least one elastic component, wherein the button unit is disposed on the bottom plate and includes a key cap and is located between the key cap and the bottom plate a connecting mechanism for moving up and down, and the elastic element is disposed between the thin film circuit board and the plurality of button units. When the user presses on the surface of the key cap of the button unit, the key cap thereof presses the elastic member to touch the thin film circuit. On the board, the upper layer and the lower layer circuit of the membrane switch are respectively disposed on the opposite inner side surfaces of the two film layers, and the intermediate layer required to form electrical isolation is disposed between the two film layers, so that the upper film layer is pressed The through-hole of the intermediate layer and the membrane switch of the lower film layer are in contact with each other to form electrical conduction, so as to generate a trigger signal corresponding to the pressed symbol of the button unit to be output to the controller of the backlit keyboard, Input operation of text, numbers or instructions.

Since the backlit keyboard has been used for decades, the technology of the backlit keyboard has been very mature, and the internal structure of the backlit keyboard is very simplified, unless a new structure is developed and produced with the improvement of the process technology. A circuit board with ultra-fine lines, thinner and lighter materials, otherwise it is very difficult to make a huge change to the backlit keyboard structure, so when the general structure cannot be changed, it is generally in the backlight keyboard detailed structure. The change is to reduce the overall thickness of the whole, and it can better meet the design requirements of light, thin, short and small backlighting related products, and the assembly process and component manufacturing cost also need to be considered, which can meet the practical application of the backlit keyboard. However, the backlight module currently used in the backlit keyboard has a reflective sheet. A flexible circuit board with a light-emitting diode is mounted on one surface of the light guide plate, and a reflective layer and a light shielding film are respectively arranged from the bottom to the top on the light guide plate to form a layered structure. The thin film circuit board of the button module is provided with the upper layer and the lower layer circuit of the membrane switch by using the two film layers, and the intermediate layer required for electrical isolation is disposed between the two film layers, and the multi-layer structure design cannot simplify the overall structure. The total thickness is relatively increased, and it is difficult to effectively shorten the assembly process due to the large number of components during assembly. The reflective sheet also needs to be provided with a flexible circuit board to provide a plurality of through holes for the light-emitting diode to protrude into the light guide plate. The high cost of manufacturing is caused by the desire of relevant manufacturers in this industry to research and improve.

Therefore, in view of the above-mentioned problems and shortcomings, the new creators have collected the relevant materials through various evaluations and considerations, and have used the trial and modification of many years of R&D experience in this industry to design such a membrane switch function. The new backlight module was born.

The main purpose of the present invention is that the backlight module is located on the reflective layer on the upper surface of the reflective film, and the first circuit layer is provided with a lower layer of the membrane switch, and a light guide plate and a light shielding film are sequentially disposed on the upper surface of the first circuit layer, and The lower surface of the light-shielding film is provided with a second circuit layer in which the upper layer of the membrane switch is located at a symmetrical position of the first circuit layer, and the backlight module is adjacent to the light-guiding plate, and a light-emitting element that emits light toward the light incident region is disposed at the light guide plate. The structural design not only omits the conventional reflective sheet, but also directly fabricates the lower layer circuit of the original membrane switch on the reflective film, and can be combined with the circuit and the power supply line in which the light-emitting elements are electrically connected, so that no additional equipment is required. The flexible circuit board of the light-emitting diode and the number of through holes for reducing the light-reflecting sheet are simplified, so that the overall occupied volume and the total thickness are reduced and thinner, and the component reduction during assembly can shorten the assembly process and reduce the manufacturing cost. And because the reduction of the through hole can increase the space of the first circuit layer of the reflective film The layout area is such that the light-emitting elements can be set at different positions according to the selection, and the number of the light-emitting elements matched with the light guide plate can be increased to improve the light-emitting effect of the backlight module.

The secondary purpose of the present invention is that the reflective film of the backlight module uses the reflective layer to form the first circuit layer of the first electrode contact line of the lower layer of the membrane switch, and is matched with the conductive contact that electrically connects the light source to the light-emitting element. The circuit is also formed on the first circuit layer, and some of the lines can also be made with jumpers, or the lower layer of the membrane switch and the light-emitting element (light-emitting diode) line can be made in the same layer of the first circuit layer, or They are separately formed on the upper/lower layer of the reflective film, and a light guide plate is disposed between the reflective film and the light shielding film, except for light conduction and light guiding, and the predetermined pitch of the through holes is used as the first line of the lower layer of the membrane switch. The layer forms a mesoporous layer required for electrical isolation from the second circuit layer of the upper layer.

Another purpose of the present invention is that the backlight module is disposed above the light shielding film to be provided with a button assembly, and includes a bottom plate, a plurality of button units and elastic members, wherein the button unit includes a key cap and a connection between the key cap and the bottom plate a mechanism, and the elastic member is disposed between the button unit and the light shielding film. When the user presses the button unit, the key cap drives the connecting mechanism, and the pressing elastic member abuts against the second circuit layer of the light shielding film. In the through hole of the light plate, the displacement stroke required for elastic deformation can be provided through the through hole, so that the second circuit layer of the upper layer of the membrane switch contacts the first circuit layer of the lower layer of the reflective film to form electrical conduction, so as to generate corresponding to the The trigger signal of the pressed button unit character symbol is output to the controller of the backlight keyboard; when the light-emitting element of the light source projects light toward the light incident region of the light guide plate, the light can be conducted inside the light guide plate and the uniform light guide is emitted. Bright, and use the reflective layer of the reflective film to reflect the light emitted from the lower surface of the light guide plate back to the light guide plate, so that the light of the light guide plate passes upward through the light shielding film. After light region, and then is incident onto the keypad assembly having a light transmitting unit formed at the back of the key.

1‧‧‧Reflective film

11‧‧‧reflective layer

12‧‧‧First line layer

121‧‧‧First electrode contact

122‧‧‧Electrical contacts

13‧‧‧Perforation

2‧‧‧Light guide plate

21‧‧‧through hole

22‧‧‧Light incident area

221‧‧‧ hole

23‧‧‧Perforation

3‧‧‧Shade film

31‧‧‧Second circuit layer

311‧‧‧Second electrode contact

312‧‧‧Electrical contacts

32‧‧‧Perforation

4‧‧‧Light source

41‧‧‧Lighting elements

5‧‧‧Key components

51‧‧‧floor

511‧‧‧Docking Department

5111‧‧‧ buckle feet

52‧‧‧Key unit

521‧‧‧Key Cap

522‧‧‧Linked institutions

53‧‧‧Flexible components

The first figure is a perspective view of the first preferred embodiment of the creation.

The second drawing is an exploded perspective view of the first preferred embodiment of the creation.

The third figure is a front cross-sectional view of the section A-A of the first drawing of the creation.

The fourth figure is a side cross-sectional view of the section B-B of the first drawing of the creation.

The fifth figure is a partial enlarged view of the X part of the fourth drawing of the creation.

Figure 6 is a perspective exploded view of the second preferred embodiment of the present invention.

Figure 7 is a side cross-sectional view of the second preferred embodiment of the present invention.

The eighth figure is a partial enlarged view of the Y part of the seventh drawing of the creation.

In order to achieve the above objectives and effects, the technical means and its construction adopted in the present invention are described in detail in the preferred embodiment of the present invention, and the structure and function are as follows.

Please refer to the first, second, third, fourth and fifth figures, which are respectively a perspective view, an exploded view, a front view of the first AA section, and a first view of the first preferred embodiment. A side view of the cross section and a partial enlarged view of the X portion of the fourth figure. It can be clearly seen from the figure that the backlight module with the membrane switch function includes the reflective film 1, the light guide plate 2, and the light shielding film 3. And projecting light toward the light guide plate 2 to uniformly guide the light source 4, so the main components and features of the present case are as follows:

The reflective film 1 is a single-layer insulating film, and the film can be polycarbonate (PC), polyethylene terephthalate (PET), polyester film (MYLAR). , Mylar sheet) or other flexible material, and formed on the surface of the reflective film 1 (such as the surface) by white high-reflection ink or other materials by coating, printing, etc. a reflective layer 11 having a low light transmission and a high reflectivity, and a first circuit layer 12 having a line (not shown) is disposed on the surface of the reflective layer 11 by means of printing, etching, and electroplating, and then separately on the line. The method includes a plurality of first electrode contacts 121, at least one set of positive and negative conductive contacts 122, and a power contact (not shown).

The light guide plate 2 is a single-layer material with a light guiding function, and the soft plate can be made of polycarbonate (PC), polymethyl methacrylate (PMMA) or other materials with high refractive index. And is disposed on one surface of the reflective film 1 (such as the upper surface of the first circuit layer 12) by means of printing, gluing, thermocompression, etc., and the light guide plate 2 is mechanically drilled, stamped or laser processed. A plurality of through holes 21 corresponding to the first electrode contacts 121 are respectively formed, and a light incident region 22 is formed on the surface of the light guide plate 2, and at least one of the above-mentioned processing methods can be used in the light incident region 22. Corresponding to the hole 221 at the conductive contact 122.

The light shielding film 3 is a single-layer insulating material film, and the film may be polycarbonate (PC), polyethylene terephthalate (PET), polyester film (MYLAR, Mylar) or the like. Made of a flexible material, and disposed on the other side surface of the light guide plate 2 with respect to the reflective film 1 (such as the surface), and the surface of the reflective film 1 (such as the surface) is made of white high reflection or black high light absorption. The ink or other material is formed with a light shielding layer (not shown) by coating, printing, etc., but in practical application, the reflective film 1 itself may also have a semi-transparent or opaque color (such as deep). a color or light color, a film of the material or a surface of the film is further attached with a light-shielding tape (not shown), and then formed on the light-shielding film 3 or the light-shielding layer thereof. There is a light-transmissive region (not shown) corresponding to the through-hole 21, and the light-shielding film 3 is disposed on the inner surface of the light-guiding plate 2 (the surface as follows) by a process such as printing, etching, and electroplating. a second circuit layer 31 (not shown), the second circuit layer 31 is located at a symmetrical position with the first circuit layer 12, and includes a plurality of second electrode contacts 311 on the line, and the second electrode is connected The point 311 corresponds to the through hole 21 of the light guide plate 2 and the first electrode contact 121 of the first circuit layer 12, respectively.

The light source 4 is disposed adjacent to the light guide plate 2 and includes at least one side-emitting or top-emitting light-emitting element 41 that projects light toward a light-incident surface (not shown) on the side of the light guide plate 2 ( For example, a light-emitting diode, and each of the light-emitting elements 41 is electrically connected to the first circuit layer 12 of the reflective film 1 by at least one set of positive and negative conductive contacts 122 of the reflective film 1 by surface adhesion technology (SMT), and The light-emitting elements 41 respectively extend into the corresponding light incident regions 22 of the light guide plate 2 and are located in the holes 221, so that the light guide plate 2 can receive the light projected by the light-emitting elements 41 to conduct and guide light therein, and then utilize the microstructure or diffusion. Points (not shown) are designed to reduce the total reflection of the light in a pattern of different density and different sizes, so that the light can be guided to the light-emitting surface (not shown) where the light guide plate 2 is appropriate to be projected and increased. The uniformity of the overall light-emitting area and the function of enhancing the brightness of the light.

However, in the embodiment, the reflective film 1 is formed on the reflective layer 11 to form the first circuit layer 12 of the first electrode contact 121 of the lower layer of the thin film switch, and is used to electrically connect the light source 4 to the light-emitting element 41. The conductive contacts 122 are formed on the first circuit layer 12, and some of the lines can also be made with jumpers, but in practical applications, the membrane switch can also be customized according to the manufacturer's custom specifications or customized requirements. An LED (Light Emitting Diode) line for connecting the lower layer wiring and the light emitting element 41 is formed at the same layer position of the first wiring layer 12, Alternatively, the above-mentioned lines may be separately formed on the upper layer (upper surface)/lower layer (the following surface) of the reflective film 1, and the light guide plate 2 is disposed between the reflective film 1 and the light shielding film 3, except for light conduction and conduction. In addition to the light-emitting function, the predetermined spacing may be separated by the through-hole 21 as the first electrode contact 121 of the first circuit layer 12 of the lower layer of the membrane switch and the second electrode contact 311 of the upper second layer 31 is electrically isolated. The required intermediate layer, and the first circuit layer 12 can also be connected with a power contact integrated with a power line and electrically connected to an external power supply, and the simple modification and the like of the present specification and the drawings are used. The structural changes shall be included in the scope of the patent of this creation and shall be combined with Chen Ming.

The backlight module with the membrane switch function can be further applied to the button assembly 5 to form an illuminated keyboard. The button assembly 5 includes a bottom plate 51, a plurality of button units 52 and at least one elastic member 53, and the bottom plate 51 is The plurality of abutting portions 511 having the fastening legs 5111 are disposed on the surface of the bottom plate 51, and the fastening legs 5111 are sequentially passed through the reflective film. 1. The light guide plate 2 and the corresponding perforations 13, 23, 32 on the light shielding film 3, and the button unit 52 is disposed above the light shielding film 3, and includes a key cap 521 and is located between the key cap 521 and the bottom plate 51. The key cap 521 is a connecting mechanism 522 for moving up and down, and the connecting mechanism 522 can be a scissor foot or a butterfly structure, and the shaft portion (not labeled) at the periphery of the connecting mechanism 522 can be connected to the butting portion 511 of the bottom plate 51 respectively. The connecting portion of the pin 5111 and the key cap 521 is pivotally connected, and the dome-shaped elastic member 53 made of rubber material is further disposed between the button unit 52 and the light shielding film 3 for elastic support. Good when pressed on the key cap 521 The good elastic feedback can also be adjusted according to the number of the button components 5 applied to the illuminated keyboard to match the number of the backlight modules.

When the user presses the button unit 52 of the button assembly 5, the key cap 521 drives the coupling mechanism 522, and the second circuit layer 31 that presses the elastic member 53 against the light shielding film 3 extends into the light guide plate 2. In the through hole 21, the displacement stroke required for the elastic deformation of the light shielding film 3 is provided through the through hole 21, so that the second electrode contact 311 of the second circuit layer 31 of the upper layer of the membrane switch contacts the first circuit layer 12 of the lower layer of the reflective film 1. The first electrode contact 121 is electrically connected to generate a trigger signal corresponding to the pressed symbol of the depressed button unit 52 to the backlight keyboard; if the user stops pressing the button unit 52, the user The elastic member 53 is elastically reset and pushed by the key cap 521 to displace the coupling mechanism 522 upward, and the light shielding film 3 is elastically reset upwardly and exits through the through hole 21, and the second circuit layer 31 and the reflective film 1 are A circuit layer 12 is electrically separated to complete a single pressing stroke of the button; and when the light-emitting element 41 of the light source 4 emits light, light can be projected toward the light-emitting surface of the through-hole 21 of the light incident region 22, and the light is made Inside the light guide 2 Conducting and uniform light guiding and illuminating, and reflecting the light emitted from the lower surface of the light guide plate 2 through the reflective layer 11 of the reflective film 1 back to the light guide plate 2, so that the light of the light guide plate 2 passes through the light-emitting surface The light-transmitting region of the film 3 is incident on the button unit 52 having the light-transmissive property on the button assembly 5 to form a backlight, thereby achieving a good backlight keyboard illumination effect.

The reflective film 1 of the present invention is formed on the reflective layer 11 with the first circuit layer 12 of the lower layer of the membrane switch, and is formed on the line connecting the light source 4 to the light-emitting element 41, and the upper surface of the reflective film 1 is formed thereon. The light guide plate 2 and the light shielding film 3 are sequentially disposed, and the second circuit layer 31 of the upper layer of the membrane switch is disposed on the inner surface of the light shielding film 3 opposite to the light guide plate 2 (the surface is as follows), and the light guide plate 2 has light conduction. And the light guide is brightened, and the first circuit layer 12 of the membrane switch can be electrically isolated from the second circuit layer 31 by using the through hole 21 as a membrane switch. The required intermediate layer and the displacement of the light-shielding film 3 by elastic deformation when pressed, the structural design of the reflective film 1 can not only omit the reflective sheet of the conventional backlight module, but also directly under the original membrane switch It is formed on the reflective film 1 and the first circuit layer 12 is provided with a circuit and a power line integrated with the light source 4 for electrically connecting the light-emitting element 41, so that no additional flexible circuit board and its coupled light-emitting diode are required. The polar body is configured to reduce the number of through holes on the reflective sheet for the light emitting diode to protrude therein, and the backlight module can simplify the overall structure and the occupied volume when the number of layers is reduced, so that the total thickness is relatively The invention is reduced in size and thinner, and the number of components is reduced during assembly, so that the assembly process can be shortened and the manufacturing cost can be reduced. Further, the reduction of the through holes formed in the reflective film 1 can relatively increase the layout area of the first circuit layer 12. The light-emitting element 41 of the light source 4 can be disposed at different positions according to requirements or options without being limited by space, and the number of the light-emitting elements 41 matched with the light guide plate 2 can be appropriately adjusted, thereby improving A light emitting area of the light module effect of uniformity.

Please refer to the sixth, seventh, and eighth figures, which are respectively a perspective exploded view, a side cross-sectional view, and a partial enlarged view of the Y portion of the seventh embodiment of the second preferred embodiment, which can be clearly seen from the figure. The first circuit layer 12 of the reflective film 1 includes a plurality of first electrode contacts 121 and at least one set of conductive contacts 122 (as shown in FIG. 5), and is electrically connected to the conductive contacts 122. The light-emitting element 41 of the light source 4, but in practical applications, the second circuit layer 31 of the light-shielding film 3 may further include a plurality of second electrode contacts 311 and at least one set of conductive contacts 312 (as shown in the eighth figure) The light-emitting elements 41 of the light source 4 are electrically connected to the conductive contacts 122, and the light-emitting elements 41 respectively project light toward the corresponding light incident regions 22 of the light guide plate 2, and may further be matched on the second circuit layer 31. A power contact (not shown) integrated with a power line is connected to an external power supply.

As shown in the second, third, fifth, sixth, and eighth diagrams, the present invention is mainly directed to the reflective film 1 of the backlight module, which is a first circuit layer 12 on which the lower layer of the membrane switch is disposed on the reflective layer 11. A light guide plate 2 and a light shielding film 3 are disposed on the upper surface of the circuit layer 12, and a second circuit layer 31 is disposed on the lower surface of the light shielding film 3 at a symmetric position of the first circuit layer 12, and the backlight module is adjacent to each other. The light guide plate 2 is provided with a light source 41 for projecting light toward the light incident region 22, and the light guide plate 2 has the light transmission and the light guide, and serves as the first circuit layer 12 of the membrane switch. The two circuit layers 31 form a middle spacer layer required for electrical isolation. The structure of the reflective film 1 can omit the conventional reflective sheet, and the underlying circuit of the original thin film switch can be directly fabricated on the reflective film 1 and can be combined with integrated illumination. The circuit and the power supply line electrically connected to the component 41 reduce the overall thickness of the whole structure, shorten the assembly process and reduce the manufacturing cost, and the first circuit layer of the reflective film 1 can be relatively increased due to the reduction of the through hole formed by the retroreflective sheeting. 12 empty Using the layout area of the light emitting element 41 disposed at different positions selected to follow and to increase the number of settings to enhance the luminous effect of the backlight module.

The above detailed description is intended to illustrate a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and other equivalents and modifications may be made without departing from the spirit of the invention. Changes are to be included in the scope of patents covered by this creation.

In summary, the above-mentioned backlight module with the membrane switch function can achieve its efficacy and purpose when used. Therefore, this creation is a practical and excellent creation, which is in line with the application requirements of the new patent. To file an application, I hope that the trial committee will grant the case as soon as possible to protect the hard work of the new creators. If there is any doubt in the bureau, please do not hesitate to give a letter, and the new creators will try their best to cooperate with them.

1‧‧‧Reflective film

13‧‧‧Perforation

2‧‧‧Light guide plate

21‧‧‧through hole

22‧‧‧Light incident area

221‧‧‧ hole

23‧‧‧Perforation

3‧‧‧Shade film

32‧‧‧Perforation

4‧‧‧Light source

41‧‧‧Lighting elements

5‧‧‧Key components

51‧‧‧floor

511‧‧‧Docking Department

5111‧‧‧ buckle feet

52‧‧‧Key unit

521‧‧‧Key Cap

522‧‧‧Linked institutions

53‧‧‧Flexible components

Claims (16)

A backlight module with a membrane switch function includes a reflective film, a light guide plate, a light shielding film and a light source, wherein: the upper surface of the reflective film is formed with a reflective layer, and the first layer of the lower layer of the membrane switch is disposed on the reflective layer a light guiding plate is disposed on an upper surface of the first circuit layer of the reflective film, and a light incident region is formed on the light guide plate; the light shielding film is disposed on the upper surface of the light guide plate opposite to the reflective film, and is shielded from light The film is disposed on the lower surface of the light guide plate with a second circuit layer of the upper layer of the membrane switch at a symmetric position of the first circuit layer; the light source is disposed adjacent to the light guide plate and includes at least one light projecting toward the light incident region A light-emitting element that conducts and guides light inside the light guide plate. The backlight module with a membrane switch function according to claim 1, wherein the reflective film is a single layer insulating material of polycarbonate, polyethylene terephthalate or polyester film, and is reflective film. The upper surface is formed with a reflective layer using white ink. The backlight module with a membrane switch function according to the first aspect of the invention, wherein the first circuit layer of the reflective film comprises a plurality of first electrode contacts, and the light guide plate is provided with a corresponding first a plurality of through holes at the electrode contacts, wherein the second circuit layer of the light shielding film is located at a symmetrical position with the first circuit layer, and includes a plurality of corresponding to the through holes and the first electrode contacts respectively on the second circuit layer Two electrode contacts. The backlight module with a membrane switch function according to claim 1, wherein the first circuit layer of the reflective film comprises at least one set of conductive contacts and light rays on the light guide plate. The incident region is provided with at least one hole corresponding to the conductive contact, and the light-emitting element of the light source is electrically connected to the conductive contact of the first circuit layer, and extends into the corresponding light incident region of the light guide plate and is located in the hole. . The backlight module with a membrane switch function according to the first aspect of the invention, wherein the light guide plate is a single layer light guide material of polycarbonate or polymethyl methacrylate, and the light incident on the surface of the light guide plate is incident. The area is provided with at least one hole that receives the light source and emits light to conduct and guide the light inside the light guide plate. The backlight module with a membrane switch function according to claim 1, wherein the light guide plate is disposed between the reflective film and the light shielding film, and forms a electricity between the first circuit layer and the second circuit layer of the membrane switch. Separated septum. The backlight module with a membrane switch function according to the first aspect of the invention, wherein the second circuit layer of the light shielding film comprises at least one set of conductive contacts, and at least a light incident region of the light guide plate is provided at least A light-emitting element corresponding to the conductive contact is electrically connected to the conductive contact of the second circuit layer, and extends into the corresponding light incident region of the light guide plate and is located in the hole. The backlight module with a membrane switch function according to claim 1, wherein the light-emitting element of the light source is a side-emitting or top-emitting light-emitting diode. An illuminated keyboard includes a backlight module having a membrane switch function as claimed in claim 1, wherein: the light guide plate of the backlight module is located between the reflective film and the light shielding film, and serves as a first circuit layer and a membrane switch The second circuit layer forms an electrically isolated intermediate layer, and the backlight module is provided with a button component; The button assembly includes a bottom plate, a plurality of button units, and at least one elastic member, wherein the button unit is disposed above the light shielding film and includes a key cap and a connecting mechanism between the key cap and the bottom plate, and the elastic component is disposed on the button unit When the keycap of the button unit drives the connecting mechanism and presses the elastic member against the light shielding film, the second circuit layer of the upper layer of the membrane switch and the first circuit layer of the lower layer of the reflective film are electrically connected. . The illuminating keyboard of claim 9, wherein the backlight module is a single-layer insulating material of polycarbonate, polyethylene terephthalate or polyester film, and is used on the upper surface of the reflective film. The white ink is formed with a reflective layer. The illuminating keyboard of claim 9, wherein the first circuit layer of the reflective film of the backlight module includes a plurality of first electrode contacts, and the first electrode contacts are disposed on the light guide plate. a plurality of through holes, wherein the second circuit layer of the light shielding film is located at a symmetrical position with the first circuit layer, and the second circuit layer includes a plurality of second electrode connections respectively corresponding to the through holes and the first electrode contacts point. The illuminating keyboard of claim 9, wherein the first circuit layer of the reflective film of the backlight module comprises at least one set of conductive contacts, and at least one corresponding to the light incident region of the light guide plate corresponds to The light-emitting element of the light source is electrically connected to the conductive contact of the first circuit layer, and extends into the corresponding light incident region of the light guide plate and is located in the hole. The illuminating keyboard of claim 9, wherein the backlight module light guide plate is a single layer light guiding material of polycarbonate or polymethyl methacrylate, and is disposed on a light incident region on the surface of the light guide plate. At least one hole is provided for receiving light from the light source for conducting and guiding light inside the light guide plate. The illuminating keyboard of claim 9, wherein the second circuit layer of the backlight module of the backlight module comprises at least one set of conductive contacts, and at least one corresponding to the light incident region of the light guide plate corresponds to The light-emitting element of the light source is electrically connected to the conductive contact of the second circuit layer, and extends into the corresponding light incident region of the light guide plate and is located in the hole. The illuminating keyboard of the ninth aspect of the invention, wherein the illuminating element of the backlight module light source is a side illuminating or a top illuminating illuminating diode. The illuminating keyboard of claim 9, wherein the bottom plate of the button component is disposed on a lower surface of the reflective film of the backlight module, and is disposed on the surface of the bottom plate sequentially through the reflective film, the light guide plate and the light shielding The film corresponds to the plurality of abutting portions of the perforations, and each of the abutting portions is a connecting mechanism that is respectively pivotally connected to the button unit.