Backlight module and electronic equipment

Abstract

The utility model discloses a backlight module and electronic equipment, and the backlight module comprises a light guide assembly which comprises a first light guide area and a second light guide area which are sequentially arranged in a first direction; the first light guide area is provided with a first thickness part with the same thickness as the second light guide area and a second thickness part located on the first thickness part; a light-emitting element including a first light-emitting portion and a second light-emitting portion; in the first direction, the first thickness part is opposite to the first light-emitting part so as to introduce light emitted by the first light-emitting part, and the second thickness part is opposite to the second light-emitting part so as to introduce light emitted by the second light-emitting part; the light guide assembly can guide at least part of light emitted by the second light emitting part into the first thickness part based on the second thickness part; the surface of the side, close to the second thickness part, of the second light guide area is provided with a plurality of target positions arranged at intervals, light emitted by the light-emitting element can be guided out at the target positions, and backlight is provided for a target device above the target positions.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electronic devices, and in particular to a backlight module and an electronic device. BACKGROUND

[0002] External devices of electronic devices play a crucial role in modern technological life. They not only expand the functions of electronic devices, but also improve user experience and work efficiency. With the continuous development of technology, the types and functions of external devices are constantly enriched and innovated, bringing users a more convenient and efficient use experience. Among them, input devices are a kind of external device commonly used by electronic devices.

[0003] At present, input devices can realize the functions of key lighting and increasing appearance diversity by integrating backlight modules. In the existing backlight module, the utilization rate of the light rays emitted by the light emitting element by the light guide assembly is low, resulting in poor backlight effect of the input device. Utility model content

[0004] In view of the above problems, the present application provides a backlight module and an electronic device to improve the utilization rate of light rays emitted by the light emitting element. The specific scheme is as follows:

[0005] The first aspect of the present application provides a backlight module, comprising:

[0006] A light guide assembly, the light guide assembly comprises a first light guide region and a second light guide region arranged in sequence along a first direction, the first direction being parallel to the plane where the backlight module is located; the first light guide region has a first thickness part with the same thickness as the second light guide region and a second thickness part located on the first thickness part;

[0007] A light emitting element, in the thickness direction of the light guide assembly, the light emitting element comprises a first light emitting part and a second light emitting part;

[0008] Wherein, in the first direction, the first thickness part is opposite to the first light emitting part to guide the light rays emitted by the first light emitting part, and the second thickness part is opposite to the second light emitting part to guide the light rays emitted by the second light emitting part; the light guide assembly can guide at least part of the light rays emitted by the second light emitting part into the first thickness part based on the second thickness part; the side surface of the second light guide region close to the second thickness part has a plurality of target positions arranged at intervals, which can guide the light rays emitted by the light emitting element out of the target positions, for providing backlight for the target device above the target positions.

[0009] Optionally, in the above backlight module, the light emitting element is embedded in the first light guide region from the side of the first thickness part away from the second thickness part, and the first light emitting part is located in the first thickness part, and the second light emitting part is located in the second thickness part.

[0010] Optionally, in the backlight module, in the first direction, the second thickness portion comprises a first side wall adjacent to the second light guide region, and the light emitting element is located on a side of the first side wall away from the second light guide region.

[0011] In the direction in which the first thickness portion points to the second thickness portion, at least two different distance values are included between the first side wall and the light emitting element.

[0012] Optionally, in the backlight module, further comprising a reflective film, the reflective film comprising a first reflective region; the first reflective region covering the first light guide region and a side surface of the second light guide region away from the second thickness portion.

[0013] Optionally, in the backlight module, the reflective film further comprises a second reflective region, the second reflective region covering at least a side surface of the second thickness portion away from the first thickness portion.

[0014] Optionally, in the backlight module, the reflective film further comprises a third reflective region connected between the first reflective region and the second reflective region, the second reflective region being folded to the side surface of the second thickness portion away from the first thickness portion based on the curved third reflective region to cover the surface; in the first direction, the third reflective region is arranged opposite to the side wall of the first light guide region away from the second light guide region.

[0015] Optionally, in the backlight module, the third reflective region is an arc surface curved towards the side wall.

[0016] Optionally, in the backlight module, the second reflective region further covers a side surface of the second light guide region towards the second thickness portion, and the second reflective region has a light transmission hole exposing a target position.

[0017] Optionally, in the backlight module, the first thickness portion and the second light guide region are different parts of a first light guide film;

[0018] The second thickness portion is a second light guide film stacked on the first light guide film, and exposes a part of the first light guide film corresponding to the second light guide region.

[0019] Optionally, in the backlight module, further comprising a light shielding film, the light shielding film covering a surface of the second thickness portion away from the first thickness portion, and covering a side surface of the second light guide region towards the second thickness portion;

[0020] The light shielding film has a light transmission window exposing a target position.

[0021] Optionally, in the backlight module, there are a plurality of light emitting elements, and the light emitting elements are respectively embedded in different positions of the first light guide region through different accommodating cavities.

[0022] The light emitting elements are fixed on the same circuit board.

[0023] Optionally, in the backlight module, the target position has a plurality of dot structures for changing the transmission direction of the light in the second light guide region, so that the light can be emitted from the target position.

[0024] The second aspect of the application provides an electronic device, comprising:

[0025] A plurality of target devices for input keys;

[0026] The backlight module comprises a light guide assembly, the light guide assembly comprising a first light guide region and a second light guide region arranged in sequence along a first direction, the first direction being parallel to the plane on which the backlight module is located; the first light guide region has a first thickness part with the same thickness as the second light guide region and a second thickness part located on the first thickness part; a light emitting element, in the thickness direction of the light guide assembly, the light emitting element comprising a first light emitting part and a second light emitting part;

[0027] Wherein, in the first direction, the first thickness part is opposite to the first light emitting part to guide the light emitted by the first light emitting part, and the second thickness part is opposite to the second light emitting part to guide the light emitted by the second light emitting part; the light guide assembly can guide at least part of the light emitted by the second light emitting part into the first thickness part based on the second thickness part; the side surface of the second light guide region close to the second thickness part has a plurality of target positions arranged at intervals, which can guide the light emitted by the light emitting element out of the target position, for providing backlight for the target device above the target position. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments or the related art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only embodiments of the application, and those skilled in the art can obtain other drawings according to the provided drawings without creating any creative labor.

[0029] The structures, proportions, sizes, etc. shown in the drawings of the specification are only used to cooperate with the content disclosed in the specification, to be understood and read by those skilled in the art, and do not define the limiting conditions for the implementation of the application, so they do not have technical significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effect and purpose that can be achieved by the application, shall still fall within the scope of the technical content disclosed by the application.

[0030] Figure 1 It is a structural schematic diagram of an input device with a backlight module;

[0031] Figure 2A structural diagram of a backlight module for an input device;

[0032] Figure 3 A structural diagram of a backlight module for an input device;

[0033] Figure 4 A structural diagram of a backlight module for an input device;

[0034] Figure 5 A structural diagram of a backlight module for an input device;

[0035] Figure 6 A structural diagram of a backlight module for an input device;

[0036] Figure 7 A structural diagram of a backlight module for an input device;

[0037] Figure 8 A structural diagram of a backlight module for an input device;

[0038] Figure 9 A structural diagram of a backlight module for an input device;

[0039] Figure 10 A structural diagram of a backlight module for an input device;

[0040] Figure 11 A structural diagram of a backlight module for an input device;

[0041] Figure 12 A structural diagram of a backlight module for an input device;

[0042] Figure 13 A structural diagram of a backlight module for an input device;

[0043] Figure 14 A structural diagram of a backlight module for an input device; Figure 13 A top view of the backlight module shown in FIG. 10 after peeling off the back reflector film and the circuit board;

[0044] Figure 15 A top view of the backlight module shown in FIG. 10 after peeling off the back reflector film and the circuit board; Figure 13 A top view of the backlight module shown in FIG. 10 after peeling off the back reflector film and the circuit board;

[0045] Figure 16 A structural diagram of a backlight module for an input device;

[0046] Figure 17 A front view of an input device;

[0047] Figure 18 FIG. 1 is a structural schematic diagram of an electronic device according to an embodiment of the present application.

[0048] Reference signs:

[0049] 11-backlight module; 12-support plate; 13-circuit layer; 14-elastic support; 15-scissors support frame; 16-keycap; 17-light guide assembly; 171-first light guide area; 172-second light guide area; 18-target position; 19-light emitting element; 191-first light emitting part; 192-second light emitting part; 20-circuit board; 21-dot structure; 221-first thickness part; 222-second thickness part; 23-first side wall; 24-reflective film; 241-first reflective area; 242-second reflective area; 243-third reflective area; 25-translucent hole; 261-first light guide film; 262-second light guide film; 27-shading film; 271-translucent window; 28-housing cavity; 29-input device; 291-target device; 30-display device. DETAILED DESCRIPTION

[0050] The embodiments in the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Those skilled in the art can know that the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems with the development of technology and the appearance of new scenarios.

[0051] Reference Figure 1 , Figure 1 FIG. 1 is a structural schematic diagram of an input device with a backlight module, the input device comprising: a backlight module 11, a support plate 12 and a circuit layer 13 which are sequentially stacked. The surface of the circuit layer 13 is fixed with a plurality of target devices.

[0052] In order to reduce the thickness of the input device, the circuit layer 13 can be a flexible PET printed circuit film. The circuit layer 13 can also be a PCB or a FPC, and the embodiments of the present application do not limit this.

[0053] The input device can be a keyboard, and the target device can be a key of the keyboard. The target device comprises: an elastic support 14 fixed on the surface of the circuit layer 13; and a keycap 16 fixed on the top of the elastic support 14. Further, the target device further comprises a scissors support frame 15, the lower end of the scissors support frame 15 is fixed on the support plate 12, and the upper end is fixed with the keycap 16.

[0054] In order to realize the thin design of the input device, reducing the thickness of the backlight module 11 is one of the design schemes for reducing the thickness of the input device. With the development of backlight technology, a light guide film with a relatively thin thickness can be used in the backlight module 11 to replace a traditional light guide plate with a relatively large thickness, so that the main thickness of the backlight module 11 can be greatly reduced, and the thickness of the input device can be reduced, and the thin design of the input device can be realized. The structure of the backlight module 11 can be as shown in Figure 2 .

[0055] Referring to Figure 2 , Figure 2 , a structure diagram of a backlight module for an input device is shown, and the backlight module includes:

[0056] a light guide assembly 17 and a reflective film 24 stacked;

[0057] a light emitting element 19, the bottom of the light emitting element 19 is fixedly connected to a circuit board 20, and the circuit board 20 is fixed to the surface of the reflective film 24 away from the light guide assembly 17; the top of the light emitting element 19 penetrates the reflective film 24 and the light guide assembly 17 in sequence;

[0058] a light shielding film 27, the light shielding film 27 is located on the side of the light guide assembly 17 away from the reflective film 24, and covers the light emitting element 19.

[0059] In the backlight module 11, except for the light emitting element 19, the thickness of each layer structure can be designed to be thin, so that the thickness of other regions except the light emitting element 19 is much smaller than the height of the light emitting element 19.

[0060] Taking a 0.4mm LED as the light emitting element 19, the thickness of the reflective film 24, the light guide assembly 17 and the light shielding film 27 stacked in sequence can be reduced to 0.2mm or less. As shown in Figure 2 , this will cause the top of the light emitting element 19 to penetrate the reflective film 24 and the light guide assembly 17 in sequence, and part of the light emitting element 19 will protrude outside the light guide assembly 17. The light emitted by the part of the light emitting element 19 protruding outside the light guide assembly 17 (as shown by the dotted arrow in Figure 2 ) cannot be utilized by the light guide assembly 17, and the light guide assembly 17 can only utilize the light emitted by the part of the light emitting element 19 embedded in the light guide assembly 17 (as shown by the arrow in Figure 2 ). When the thin film thickness in the backlight module 11 is further reduced, the light emitting element 19 will have a greater height protruding outside the light guide assembly 17.

[0061] As can be seen from the above description, since the light emitting element 19 has a large proportion of the part protruding out of the light guide assembly 17, the light emitted by this part of the light emitting element 19 cannot be utilized by the light guide assembly 17 to form the backlight, resulting in a large part of the light flux loss, and further resulting in the weakening of the backlight brightness of the backlight module 11, which will make the key backlight brightness of the input device weaker.

[0062] To solve the above problems, the embodiment of the present application provides a backlight module, and the light guide assembly of the backlight module includes a first light guide region and a second light guide region with different thicknesses. The first light guide region with a larger thickness can be provided with a first thickness part opposite to the first light emitting part of the light emitting element and a second thickness part opposite to the second light emitting part of the light emitting element. The light guide assembly can obtain the light emitted by the second light emitting part through the second thickness part, so that the light guide assembly can obtain the light emitted by the second light emitting part of the light emitting element beyond the second light guide region. The second thickness part can also guide the light emitted by the second light emitting part into the first thickness part, so that more light emitted by the light emitting element enters the second light guide region, so as to provide a backlight with greater brightness for the target device in the second light guide region, which can improve the utilization rate of the light emitted by the light emitting element by the backlight module, and also can improve the backlight brightness of the target device in the input device.

[0063] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0064] Reference Figure 3 , Figure 3 A structure schematic diagram of a backlight module provided by the embodiment of the present application is shown, and the backlight module includes a light guide assembly 17 and a light emitting element 19.

[0065] The light guide assembly 17 includes a first light guide region 171 and a second light guide region arranged in sequence along a first direction X, and the first direction X is parallel to the plane where the backlight module is located; the first light guide region 171 has a first thickness part 221 with the same thickness as the second light guide region 172 and a second thickness part 222 located on the first thickness part 221; optionally, as described below, the light guide assembly 17 can be a two-layer light guide film, or a single-layer light guide film with different thicknesses in the first light guide region 171 and the second light guide region 172; the material of the light guide film can be PMMA (polymethyl methacrylate) or PET (polyethylene terephthalate) and the like.

[0066] In the thickness direction of the light guide assembly 17 (defined as a second direction Y), the light emitting element 19 includes a first light emitting part 191 and a second light emitting part 192; the light emitting element 19 can be an LED, or a Micro-LED, or a Mini-LED and the like.

[0067] In the first direction X, the first thickness part 221 is opposite to the first light emitting part 191 to guide the light emitted by the first light emitting part 191, and the second thickness part 222 is opposite to the second light emitting part 192 to guide the light emitted by the second light emitting part 192. The light guide assembly 17 can guide at least part of the light emitted by the second light emitting part 192 to the first thickness part 221 based on the second thickness part 222. The second light guide area 172 has a plurality of target positions 18 arranged at intervals on the side surface S1 close to the second thickness part 222, and can guide the light emitted by the light emitting element 19 to the target positions to provide backlight for the target device above the target positions. For ease of illustration, Figure 3 Only one target position 18 is shown in the figure.

[0068] The thickness of the first thickness part 221 is h1, the thickness of the second thickness part 222 is h2, the thickness of the first light guide area 171 is h1+h2, the thickness of the second light guide area 172 is the same as the thickness of the first thickness part 221, and the thickness of the second light guide area 172 is h1. It can be seen that the backlight module includes the first light guide area 171 and the second light guide area 172 with different thicknesses, and the thickness of the first light guide area 171 is greater than the thickness of the second light guide area 172.

[0069] In the embodiment of the present application, the first light guide area 171 with a larger thickness has the first thickness part 221 opposite to the first light emitting part 191 and the second thickness part 222 opposite to the second light emitting part 192. In the first direction X, since the second thickness part 222 is opposite to the second light emitting part 192, the light emitted by the second light emitting part 192 can be incident on the opposite second thickness part 222, and the light guide assembly 17 can obtain the light emitted by the second light emitting part 192 through the second thickness part 222, so that the light guide assembly 17 can obtain the light emitted by the light emitting element 19 beyond the second light emitting part 192 of the second light guide area 172. The second thickness part 222 can also guide the light emitted by the second light emitting part 192 to the first thickness part 221, and then the light can be guided to the second light guide area 172 through the first light guide area 171, so that more light emitted by the light emitting element 19 enters the second light guide area 172 to provide backlight with greater brightness for the target position 18 in the second light guide area 172, which can improve the utilization rate of the light emitted by the light emitting element 19 in the backlight module and also improve the backlight brightness of the target device in the input device.

[0070] In one embodiment of the embodiment of the present application, as Figure 3As shown, the light emitting element 19 is embedded in the first light guide region 171 from the side of the first thickness portion 221 away from the second thickness portion 222, and the first light emitting part 191 is located in the first thickness portion 221 and the second light emitting part 192 is located in the second thickness portion 222. In this way, the light emitting element 19 is embedded in the light guide assembly 17, and the light emitted by the first light emitting part 191 can be directly guided into the first thickness portion 221 and the light emitted by the second light emitting part 192 can be directly guided into the second light emitting part 192, so that the utilization rate of the light emitted by the light emitting element 19 by the light guide assembly 17 can be improved.

[0071] Optionally, as shown in FIG. 2B, the top of the light emitting element 19 can be flush with the upper surface of the second thickness portion 222, and in this case, the second light emitting part 192 is completely embedded in the second thickness portion 222, so that the incidence rate of the light emitted by the second light emitting part 192 into the second thickness portion 222 can be improved. Figure 3

[0072] In other ways, the top of the light emitting element 19 can be arranged to protrude from the upper surface of the second thickness portion 222 by a predetermined height, in which case, part of the second light emitting part 192 is embedded in the second thickness portion 222 and part of the second light emitting part 192 protrudes above the second thickness portion 222; or, the top of the light emitting element 19 can be arranged to be lower than the upper surface of the second thickness portion 222, in which case, the second light emitting part 192 is completely embedded in the second thickness portion 222.

[0073] Optionally, as shown in FIG. 2B, the top of the light emitting element 19 can be flush with the upper surface of the second thickness portion 222, and in this case, the second light emitting part 192 is completely embedded in the second thickness portion 222, so that the incidence rate of the light emitted by the second light emitting part 192 into the second thickness portion 222 can be improved. Figure 3

[0074] In other ways, the bottom of the light emitting element 19 can be arranged to be below the lower surface of the first thickness portion 221, in which case, part of the first light emitting part 191 is embedded in the first thickness portion 221 and part of the first light emitting part 191 protrudes below the first thickness portion 221.

[0075] Figure 3 The light emitting element 19 is embedded in the first light guide region 171, and the light emitted by the light emitting element 19 can be directly incident from the inside of the first light guide region 171, so that the proportion of the light emitted by the light emitting element 19 that is incident into the light guide assembly 17 can be improved, and the installation and alignment of the light emitting element 19 and the light guide assembly 17 can be facilitated.

[0076] Reference is made to FIG. 1A, Figure 4 , Figure 4 FIG. 2B shows another backlight module structure provided by the embodiments of the present application, which is based on the above-described embodiments, Figure 4 ​​In the embodiment shown in FIG. 1, the light emitting element 19 is disposed on the side of the first light guide region 171 facing away from the second light guide region 172. This is a side-in backlight module, and the light emitted by the light emitting element 19 enters from the side of the first light guide region 171 facing away from the second light guide region 172.

[0077] In the embodiment of the present application, inside the second thickness portion 222, the second thickness portion 222 can guide the light into the first thickness portion 221 based on the characteristics of refraction and / or reflection of the light by the second thickness portion 222 itself, so that the light can be conducted from the first thickness portion 221 to the second light guide region 172 to form a backlight.

[0078] Reference Figure 5 , Figure 5 FIG. 1 shows a structure of a backlight module according to an embodiment of the present application. The backlight module comprises a light guide assembly 17 and a light emitting element 19. The light guide assembly 17 comprises a first thickness portion 221 and a second thickness portion 222. The first thickness portion 221 comprises a first light guide region 171 and a second light guide region 172. The second thickness portion 222 is disposed on the side of the first light guide region 171 facing away from the second light guide region 172. Figure 5 In the embodiment shown in FIG. 1, the light emitting element 19 is disposed on the side of the first light guide region 171 facing away from the second light guide region 172. This is a side-in backlight module, and the light emitted by the light emitting element 19 enters from the side of the first light guide region 171 facing away from the second light guide region 172. Figure 5 In the embodiment shown in FIG. 1, the light emitting element 19 is disposed on the side of the first light guide region 171 facing away from the second light guide region 172. This is a side-in backlight module, and the light emitted by the light emitting element 19 enters from the side of the first light guide region 171 facing away from the second light guide region 172.

[0079] In Figure 5 In the embodiment shown in FIG. 1, the light emitting element 19 is disposed on the side of the first light guide region 171 facing away from the second light guide region 172. This is a side-in backlight module, and the light emitted by the light emitting element 19 enters from the side of the first light guide region 171 facing away from the second light guide region 172.

[0080] As described above, the light emitting element 19 can be embedded in the first light guide region 171, or located outside the light guide assembly 17 on the side of the first light guide region 171 facing away from the second light guide region 172. In both cases, the light emitting element 19 is located on the side of the first side wall 23 facing away from the second light guide region 172, and the first side wall 23 and the light emitting element 19 can be disposed to have at least two different distance values.

[0081] In an embodiment, the first side wall 23 and the light emitting element 19 can be disposed to have at least two different distance values. Figure 5As shown, the first sidewall 23 is set as an inclined sidewall. The distance between the first sidewall 23 and the light-emitting element 19 gradually decreases in the direction from the first thickness portion 221 to the second thickness portion 222. When light transmitted within the second thickness portion 222 enters the first sidewall 23, it can at least increase the incident angle of some light emitted from the light-emitting element 19 at the first sidewall 23. This allows some light to undergo total internal reflection at the first sidewall 23 before entering the first thickness portion 221, and then through the first thickness portion 221 into the second light-guiding area. The transmission path of this part is as follows: Figure 5 As indicated by the arrow in the broken line.

[0082] In this embodiment, if the distance between the first sidewall 23 and the light-emitting element 19 in the direction from the first thickness portion 221 to the second thickness portion 222 includes at least two different distance values, the first sidewall 23 is not limited to using... Figure 5 The inclined planar structure shown can also be a convex curved surface, or a surface structure including multiple sawtooth structures, etc.

[0083] refer to Figure 6 , Figure 6 This is a schematic diagram of another backlight module provided in the embodiments of this application, based on any of the above-described embodiments. Figure 6 The backlight module in the illustrated configuration further includes a reflective film 24, which includes a first reflective region 241. The first reflective region 241 covers the surface of the first light guiding region 171 and the second light guiding region 172 that is away from the second thickness portion 222.

[0084] exist Figure 6 In the illustrated configuration, a reflective film 24 is provided on at least the lower surface of the light guide assembly 17. The reflective film 24 allows light incident on the lower surface of the light guide assembly 17 to be reflected back into the interior of the light guide assembly 17, thereby preventing light from being transmitted through the lower surface of the light guide assembly 17 and improving the utilization rate of the light emitted by the light-emitting element 19.

[0085] refer to Figure 7 , Figure 7 This is a schematic diagram of another backlight module provided in the embodiments of this application. Figure 6 Based on the implementation method shown, Figure 7 In the manner shown, the reflective film 24 further includes a second reflective region 242, which at least covers the side surface of the second thickness portion 222 that is away from the first thickness portion 221.

[0086] exist Figure 7In the illustrated configuration, the second reflective region 242 covers the upper surface of the light-emitting element 19 and the second thickness portion 222, which can reflect the light emitted upward from the light-emitting element 19 and the second thickness portion 222 back into the interior of the light-emitting element 19 and the second thickness portion 222, so that this portion of light can enter the light guide assembly 17 first, thereby improving the utilization rate of the light emitted by the light-emitting element 19 by the light guide assembly 17.

[0087] Optionally, the reflective film 24 may include a metal film, such as aluminum foil or a film with a silver coating.

[0088] refer to Figure 8 , Figure 8 This is a schematic diagram of another backlight module provided in the embodiments of this application. Figure 7 Based on the implementation method shown, Figure 8 In the illustrated configuration, the reflective film 24 further includes a third reflective region 243 connected between the first reflective region 241 and the second reflective region 242. The second reflective region 242 is folded over the third reflective region 243 onto the side surface of the second thickness portion 222 that is away from the first thickness portion 221 (the upper surface of the second thickness portion 222) to cover the surface. In the first direction X, the third reflective region 243 is disposed opposite to the side wall of the first light guiding region 171 that is away from the second light guiding region 172 (the left side wall of the first light guiding region 171).

[0089] exist Figure 8 In the illustrated method, a large-sized integrated reflective film 24 can be used to simultaneously cover the upper surface of the second thickness portion 222, the lower surface of the first light-guiding region 171, and the lower surface of the second light-guiding region 172. This can prevent light from being transmitted from these surfaces to the outside of the light-guiding assembly 17, thereby improving the utilization rate of the light emitted by the light-emitting element 19.

[0090] in addition, Figure 8 In the manner shown, not only can the second reflective region 242 be flipped above the surface of the second thickness portion 222 through the third reflective region 243, but the light transmitted from the sidewall of the first light guide region 171 can also be reflected back to the first light guide region 171 through the third reflective region 243, thereby improving the utilization rate of the light emitted by the light-emitting element 19 by the light guide assembly 17.

[0091] Furthermore, the second reflective region 242 also covers the first sidewall 23 of the second thickness portion 222 facing the second light guiding region 172, which can prevent light from being transmitted out of the first sidewall 23, so that the light incident on the first sidewall 23 is reflected again into the light guiding assembly 17, thereby improving the utilization rate of the light emitted by the light-emitting element 19.

[0092] exist Figure 8In the shown mode, the light escaping from the side wall of the first light guide area 171 can be reflected back into the light guide assembly 17 by a bendable reflecting film 24 covering at least the lower surface of the light guide assembly 17 and the upper surface of the second thickness part 222, and by the third reflecting area 243, so that the light escaping from the side wall of the first light guide area 171 can be prevented from escaping from the light guide assembly 17 to a large extent. At the same time, based on the high reflecting performance of the reflecting film 24, most of the light escaping from the surface of the light guide assembly 17 can be reflected back into the light guide assembly 17, so that the escaping and loss of light can be minimized.

[0093] In one embodiment, as shown in Figure 8 the third reflecting area 243 is an arc surface curved towards the side wall of the first light guide area 171 away from the second light guide area 172. The third reflecting area 243 with the curved arc surface structure has the converging reflecting capability, so that the reflectivity of the third reflecting area 243 to light can be improved, and the utilization rate of the light guide assembly 17 to the light emitted by the light emitting element 19 can be improved.

[0094] If the third reflecting area 243 is the curved arc surface, the curvature center of the high curved surface can be located in the first thickness part 221, so that the light reflected by the third reflecting area 243 can directly enter the first thickness part 221, and more light can be conducted from the first thickness part 221 to the second light guide area 172, so that the utilization rate of the light guide assembly 17 to light can be improved compared with the scheme in which the light enters the first thickness part 221 from the second thickness part 222.

[0095] Referring to Figure 9 , Figure 9 Fig. 6 is a structural schematic diagram of another backlight module provided by the embodiment of the present application, which is based on the embodiment shown in Figure 7 or Figure 8 Fig. 5, Figure 9 In the shown mode, the second reflecting area 242 also covers one side surface of the second light guide area 172 facing the second thickness part 222, and the second reflecting area 242 has a light-transmitting hole 25 exposing the target position, so that the upper surface of the second light guide area 172 can emit light from the light-transmitting hole 25 to provide backlight for the target device.

[0096] Referring to Figure 10 , Figure 10A structural schematic diagram of a light guide assembly provided by an embodiment of the present application is shown in FIG. 6. In the above-mentioned embodiments, the first thickness portion 221 and the second light guide area 172 are different parts of the first light guide film 261; and the second thickness portion 222 is the second light guide film 262 which is stacked on the first light guide film 261 and exposes the part of the first light guide film 261 corresponding to the second light guide area 172. In this way, the first light guide film 261 and the second light guide film 262 are stacked to form the light guide assembly 17 having the first light guide area 171 and the second light guide area 172, and the first light guide area 171 has a large thickness, so that the utilization rate of the light emitted by the light emitting element 19 by the light guide assembly 17 can be improved, and the brightness of the backlight emitted by the backlight module at the target position can be improved.

[0097] In Figure 10 the way shown in FIG. 6, the second light guide film 262 is stacked on the part of the first light guide film 261 corresponding to the first light guide area 171 to increase the thickness of the light guide assembly 17 in the first light guide area 171, so that the light guide assembly 17 can utilize the light emitted by the second light emitting part 192 of the light emitting element 19 which is higher than the first light guide film 261, so as to improve the proportion of the light emitted by the light emitting element 19 entering the light guide assembly 17, improve the utilization rate of the light emitted by the light emitting element 19 by the light guide assembly 17, and improve the brightness of the backlight emitted by the backlight module when the light emitting intensity of the light emitting element 19 is constant.

[0098] In Figure 10 the way shown in FIG. 6, the main area of the backlight module is the first light guide film 261 in the second light guide area 172, and the main area of the backlight module is a single-layer light guide film, so that the light guide assembly has a relatively small thickness in the second light guide area 172. Meanwhile, taking the light emitting element 19 as an example, the height of the LED is generally greater than the thickness of the single-layer light guide film, and the thickness of the stack of the first light guide film 261 and the second light guide film 262 can be equal to or approximately equal to the height of the LED, so that the thickness of the backlight module in the first light guide area 171 does not increase much compared with the conventional backlight module, and the thickness of the input device using the backlight module is less affected. In this way, if the reflective film 24 includes the second reflective area 242, the thickness of the backlight module is only increased by the thickness of the second reflective area 242.

[0099] Referring to Figure 11 , Figure 11 Another structural schematic diagram of a light guide assembly provided by an embodiment of the present application is shown in FIG. 7. Unlike the way shown in FIG. 6, in the way shown in FIG. 7, Figure 10 the first light guide film 261 is not stacked on the second light guide film 262, but the second light guide film 262 is stacked on the first light guide film 261. Figure 11The light guide assembly 17 shown is a single-layer light guide film structure. In this way, the part of the upper surface of the light guide film corresponding to the second light guide area 172 can be thinned, so that the light guide assembly 17 having the first light guide area 171 and the second light guide area 172 can be formed by a single layer of light guide film, and the first light guide area 171 has a larger thickness, so that the utilization rate of the light emitted by the light emitting element 19 by the light guide assembly 17 can be improved, and the brightness of the backlight emitted by the backlight module at the target position can also be improved.

[0100] Reference Figure 12 , Figure 12 Another structure diagram of a backlight module is provided in an embodiment of the present application, based on any of the above embodiments, Figure 12 The backlight module shown further includes a light shielding film 27 covering the surface of the second thickness part 222 facing away from the first thickness part 221, and covering the side surface of the second light guide area 172 facing the second thickness part 222; wherein the light shielding film 27 has a light transmission window 271 exposing the target position, so that the upper surface of the second light guide area 172 can emit light at the light transmission window 271 to provide backlight for the target device.

[0101] By providing the light shielding film 27, the other areas on the upper surface of the backlight module except the target position can be shielded, and light leakage in the other areas can be prevented. Optionally, the light shielding film 27 can include a transparent film and a black ink layer coated on the transparent film.

[0102] As Figure 12 shown, when the backlight module is provided with the light shielding film 27, on the upper surface of the light guide assembly 17, the second reflection area 242 can cover the upper surface of the second thickness part 222, and expose the upper surface of the second light guide area 172, the light shielding film 27 covers the upper surface of the second reflection area 242 and the upper surface of the second light guide area 172, so that the use area of the reflection film 24 can be reduced, and the preparation cost of the backlight module can be reduced.

[0103] In other ways, when the backlight module is provided with the light shielding film 27, the second reflection area 242 can also cover the upper surface of the second light guide area 172, and at this time, the light transmission hole 25 in the second reflection area 242 is vertically opposite to the light transmission window 271 in the light shielding film 27.

[0104] In an embodiment of the present application, in the first light guide area 171, the side walls of the first thickness part 221 and the second thickness part 222 facing away from the second light guide area 172 can be vertically opposite, and both are located on the same vertical surface.

[0105] Reference Figures 13-15 , Figure 13 Another structure diagram of a backlight module is provided in an embodiment of the present application,Figure 14 for Figure 13 The diagram shows a top view of the backlight module after the reflective film and circuit board have been removed. Figure 15 for Figure 13 The diagram shows a top view of the backlight module with the reflective film and circuit board fixed in place. Figures 2-13 All are cross-sectional views of the backlight module along the thickness direction.

[0106] Based on the above implementation methods, Figure 13 and Figure 14 In the illustrated configuration, the backlight module has multiple light-emitting elements 19, which are embedded in different positions of the first light-guiding region 171 through different receiving cavities 28; all light-emitting elements 19 are fixed on the same circuit board 20.

[0107] Multiple light-emitting elements 19 can be fixedly connected simultaneously via the same circuit board 20, and the light-emitting state of multiple light-emitting elements 19 can be controlled simultaneously via the same circuit board 20. The circuit board 20 is located on the side of the light guide assembly 17 opposite to the second thickness portion 222.

[0108] Optionally, the circuit board 20 can be an FPC. The circuit board 20 can also be a PCB or a thin-film printed circuit. The embodiments of this application do not limit the implementation of the circuit board 20.

[0109] exist Figures 13-15 In the illustrated configuration, the width of the second thickness portion 222 in the first direction X is smaller than the width of the first thickness portion 221 in the first direction X. The sidewall of the second thickness portion 222 facing away from the second light-guiding region 172 is recessed relative to the sidewall of the first thickness portion 221 facing away from the second light-guiding region 172. When the light guide assembly 17 is fabricated using two stacked light guide films, the recessed distance of the sidewall of the second thickness portion 222 relative to the sidewall of the first thickness portion 221 facilitates the bonding and fixing of the two light guide films in the first light-guiding region 171. In other configurations, as described above, the sidewalls of the first thickness portion 221 and the second thickness portion 222 facing away from the second light-guiding region 172 in the first light-guiding region 171 can also be arranged perpendicularly opposite each other, and both are located on the same vertical surface.

[0110] Optionally, in Figures 13-15 In the method shown, the following can be used: Figure 10 The light guide assembly 17 shown has a second light guide film 262 that can cover the upper surface of the first thickness portion 221 in the area corresponding to the circuit board 20. The width of the second light guide film 262 in the first direction X can be equal to or slightly greater than the width of the circuit board 20.

[0111] In this embodiment, the width of the first light guide region 171 in the first direction X is less than or equal to 25mm. Thus, the backlight module has only a first light guide region 171 with a width not exceeding 25mm in the first direction X, and most of the region is a thinner second light guide region 172. The thinner second light guide region 172 is the main body of the backlight module and can be used to provide backlight for multiple target devices of the input device, thereby reducing the thickness of the input device.

[0112] In one implementation, such as Figure 13 As shown, if the backlight module includes a reflective film 24, the circuit board 20 can be positioned on the surface of the first reflective region 241 facing away from the conductive side of the light guide assembly 17. In this case, the bottom of the light-emitting element 19 is located below the bottom of the light guide assembly 17, meaning the height of the first light-emitting portion 191 is greater than the thickness of the first thickness portion 221. In the first direction X, a portion of the first light-emitting portion 191 is directly opposite the first thickness portion, while other portions of the first light-emitting portion 191 are located below the first thickness portion 221. If the light-emitting element 19 is embedded within the first light guide region 171, then the light-emitting element 19 passes through the first reflective region 241 and is embedded within the first thickness portion 221, with a portion of the first light-emitting portion 191 embedded within the first thickness portion 221, and other portions exposed below the first thickness portion 221.

[0113] If the light-emitting element 19 is embedded in the first light-guiding area 171, the bottom of the light-emitting element 19 can be flush with the bottom of the first thickness portion 221. In this case, the circuit board 20 can be directly fixed on the bottom surface of the first thickness portion 221. The circuit board 20 is located between the first reflection area 241 and the first thickness portion 221, and the first reflection area 241 covers the bottom of the circuit board 20.

[0114] refer to Figure 16 , Figure 16 This is a schematic diagram of a light guide component provided in an embodiment of this application. Based on any of the above embodiments, the light guide component 17 has a plurality of dot structures 21 at the target position 18. The dot structures 21 are used to change the transmission direction of light in the second light guide region 172 so that the light can be emitted from the target position 18 so as to provide backlight for the target device above the target position 18.

[0115] Optionally, the dot structure 21 can be a raised structure located on the surface of the target position 18. The raised structure can be any one of a circular raised structure, a conical raised structure, an elliptical raised structure, or a cylindrical raised structure. Alternatively, the dot structure 21 can be a groove located within the surface of the target position 18. The groove can be any one of a circular groove, a conical groove, an elliptical groove, or a cylindrical groove. Within the same target position 18, the graphic structures of each dot structure 21 can be the same or different.

[0116] On the basis of the backlight module provided in the above-mentioned embodiments, the input device provided in another embodiment of the present application can be as shown in Figure 17 .

[0117] Reference is made to the front view of the input device provided in the present application, in combination with the front view of the backlight module provided in the above-mentioned embodiments and shown in the drawings, the input device 29 comprises: Figure 17 Figure 17 Figure 17 The backlight module provided in any of the above-mentioned embodiments comprises: a light guide assembly 17, the light guide assembly 17 comprises a first light guide region 171 and a second light guide region 172 arranged in sequence along a first direction X, the first direction X being parallel to the plane on which the backlight module is located; the first light guide region 171 has a first thickness portion 221 with the same thickness as the second light guide region 172 and a second thickness portion 222 located on the first thickness portion 221; a light emitting element 19, in the thickness direction of the light guide assembly, the light emitting element 19 comprises a first light emitting part 191 and a second light emitting part 192;

[0118] The target device 291 is used as an input key;

[0119] The backlight module provided in any of the above-mentioned embodiments comprises: a light guide assembly 17, the light guide assembly 17 comprises a first light guide region 171 and a second light guide region 172 arranged in sequence along a first direction X, the first direction X being parallel to the plane on which the backlight module is located; the first light guide region 171 has a first thickness portion 221 with the same thickness as the second light guide region 172 and a second thickness portion 222 located on the first thickness portion 221; a light emitting element 19, in the thickness direction of the light guide assembly, the light emitting element 19 comprises a first light emitting part 191 and a second light emitting part 192;

[0120] Wherein, in the first direction X, the first thickness portion 221 is opposite to the first light emitting part 191 to guide the light emitted by the first light emitting part 191, and the second thickness portion 222 is opposite to the second light emitting part 192 to guide the light emitted by the second light emitting part 192; the light guide assembly 17 can guide at least part of the light emitted by the second light emitting part 192 into the first thickness portion 221 based on the second thickness portion 222; the side surface of the second light guide region 172 close to the second thickness portion 222 has a plurality of target positions arranged at intervals, and the light emitted by the light emitting element 19 can be guided out at the target positions to provide backlight for the target device 291 above the target positions.

[0121] The cross-sectional view of the input device 29 at an input key position comprises but is not limited to that shown in Figure 1 The input device 29 has a bottom shell away from the input key, and the backlight module and other structural members between the backlight module and the input key are located in the bottom shell.

[0122] The first direction X can be parallel to one side edge of the input device, and the first light guide region 171 with a larger thickness is located below the side frame region of the input device 29 and does not overlap with the input key, so that the first light guide region 171 with a larger thickness can be arranged in the space below the side frame region, without affecting the layout space of other structural members in the input device 29.

[0123] ​​The input device provided by the embodiments of the present application can be an external keyboard of an electronic device, or a fixedly connected keyboard of a notebook computer.

[0124] The input device adopts the backlight module provided by the above embodiments, the backlight module has a relatively thin thickness in the second light guide area 172, so that the main body part of the backlight module has a relatively thin thickness, the thickness of the input device can be reduced, the light and thin design of the input device 29 is facilitated, the utilization rate of the light emitted by the light emitting element 19 can be improved, and the brightness of the backlight of the input key is improved.

[0125] On the basis of the backlight module and the input device provided by the above embodiments, the electronic device provided by another embodiment of the present application is shown in Figure 18 .

[0126] Reference Figure 18 , Figure 18 The electronic device provided by the embodiments of the present application is shown in FIG. 8, which includes the input device 29 provided by the above embodiments.

[0127] Optionally, the electronic device further includes a display device 30, which can be wirelessly connected with the input device as shown in Figure 18 . In other modes, the display device 30 can also be rotationally connected with the input device 29 through a shaft assembly, or be wiredly connected through a data line.

[0128] In the embodiments of the present application, the electronic device can be a notebook computer, a tablet computer or a desktop computer which can be externally connected with the input device 29.

[0129] The electronic device adopts the input device provided by the above embodiments, so that the light and thin design of the input device 29 can be achieved, the utilization rate of the light emitted by the light emitting element 19 can be improved, and the brightness of the backlight of the input key is improved.

[0130] In the specification of the present application, each embodiment is described in a progressive, parallel or progressive and parallel manner, and each embodiment mainly describes the difference from other embodiments. The same or similar parts of each embodiment can be referred to each other. The embodiments provided by the embodiments of the present application can be combined with each other without contradiction.

[0131] It is to be understood that the drawings and description are illustrative of exemplary embodiments and not restrictive. Like reference numerals in different drawings denote like elements. Additionally, for purposes of explanation and ease of understanding, the drawings can exaggerate the thickness of some layers, films, panels, regions, etc. It is to be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. In addition, "on" can mean that the element is positioned on or below another element, but not necessarily directly on the other element.

[0132] The terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, refer to the orientation or position of the apparatus or element as shown in the drawings, and are used only to facilitate the description of the application and to more simply identify one element from another, but do not connote or imply necessary or essential orientation or positioning of the apparatus or element, and therefore cannot be construed as limiting the application. When one component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components can also be present.

[0133] It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. It is also possible in the present application that steps can be executed in different sequence, where this is explicitly or implicitly suggested by the description or the context of the steps. Further, terms like first, second, third, and the like can be used to describe various elements, but do not imply a limitation on the number of elements or order of elements, and are used to distinguish one element from another. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising", or "includes" and / or "including" when used in this specification, specify the presence of stated features, regions, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components, and / or groups thereof.

[0134] The above description of disclosed embodiments provides enough information to enable those skilled in the art to make and use the application. Various modifications will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Accordingly, the application is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A backlight module, characterized in that, include: A light guide assembly includes a first light guide region and a second light guide region arranged sequentially along a first direction, the first direction being parallel to the plane where the backlight module is located; the first light guide region has a first thickness portion with the same thickness as the second light guide region and a second thickness portion located on the first thickness portion. The light-emitting element, in the thickness direction of the light guide assembly, includes a first light-emitting portion and a second light-emitting portion; In the first direction, the first thickness portion is opposite to the first light-emitting portion to guide the light emitted by the first light-emitting portion, and the second thickness portion is opposite to the second light-emitting portion to guide the light emitted by the second light-emitting portion; the light guide assembly can guide at least a portion of the light emitted by the second light-emitting portion into the first thickness portion based on the second thickness portion; the second light guide region has a plurality of spaced target positions on one side surface near the second thickness portion, which can guide the light emitted by the light-emitting element at the target positions to provide backlight for a target device above the target positions.

2. The backlight module according to claim 1, characterized in that, The light-emitting element is embedded in the first light-guiding area from the side of the first thickness portion away from the second thickness portion, and the first light-emitting part is located in the first thickness portion, and the second light-emitting part is located in the second thickness portion.

3. The backlight module according to claim 1, characterized in that, In the first direction, the second thickness portion includes a first sidewall adjacent to the second light-guiding region, and the light-emitting element is located on the side of the first sidewall opposite to the second light-guiding region; In the direction from the first thickness portion to the second thickness portion, there are at least two different distance values ​​between the first sidewall and the light-emitting element.

4. The backlight module according to claim 1, characterized in that, Also includes: A reflective film, the reflective film including a first reflective region; the first reflective region covers the first light guiding region and the side surface of the second light guiding region opposite to the second thickness portion.

5. The backlight module according to claim 4, characterized in that, The reflective film further includes a second reflective region, which at least covers the side surface of the second thickness portion that faces away from the first thickness portion.

6. The backlight module according to claim 5, characterized in that, The reflective film further includes a third reflective region connected between the first reflective region and the second reflective region, wherein the second reflective region is folded onto the side surface of the second thickness portion away from the first thickness portion based on the curved third reflective region to cover the surface; in the first direction, the third reflective region is disposed opposite to the side wall of the first light guiding region away from the second light guiding region.

7. The backlight module according to claim 6, characterized in that, The third reflective region is an arc surface that curves toward the sidewall.

8. The backlight module according to claim 5, characterized in that, The second reflective area also covers one side surface of the second light-guiding area facing the second thickness portion, and the second reflective area has a light-transmitting hole that exposes the target location.

9. The backlight module according to claim 1, characterized in that, The first thickness portion and the second light-guiding region are different parts of the first light-guiding film; The second thickness portion is a second light guide film stacked on the first light guide film, and exposes the portion of the first light guide film corresponding to the second light guide area.

10. The backlight module according to claim 1, characterized in that, The backlight module includes at least one of the following methods: The backlight module further includes a light-shielding film, which covers the surface of the second thickness portion away from the first thickness portion and covers the side surface of the second light-guiding area facing the second thickness portion; wherein, the light-shielding film has a light-transmitting window that exposes the target position; The backlight module has multiple light-emitting elements, which are embedded in different positions of the first light-guiding area through different receiving cavities; all light-emitting elements are fixed on the same circuit board. The target location has multiple dot structures to change the transmission direction of light in the second light-guiding region, so that the light can be emitted from the target location.

11. An electronic device, characterized in that, Multiple target devices are used as input buttons; A backlight module includes: a light guide assembly, the light guide assembly including a first light guide region and a second light guide region arranged sequentially along a first direction, the first direction being parallel to the plane where the backlight module is located; the first light guide region having a first thickness portion having the same thickness as the second light guide region and a second thickness portion located on the first thickness portion; and a light-emitting element, in the thickness direction of the light guide assembly, the light-emitting element including a first light-emitting part and a second light-emitting part. In the first direction, the first thickness portion is opposite to the first light-emitting portion to guide the light emitted by the first light-emitting portion, and the second thickness portion is opposite to the second light-emitting portion to guide the light emitted by the second light-emitting portion; the light guide assembly can guide at least a portion of the light emitted by the second light-emitting portion into the first thickness portion based on the second thickness portion; the second light guide region has a plurality of spaced target positions on one side surface near the second thickness portion, which can guide the light emitted by the light-emitting element at the target positions to provide backlight for the target device above the target positions.

Images