CN113871239A

CN113871239A - Keyboard and electronic equipment

Info

Publication number: CN113871239A
Application number: CN202110957097.5A
Authority: CN
Inventors: 魏宝; 彭永锋; 霍国亮
Original assignee: Honor Device Co Ltd
Current assignee: Xi'an Honor Device Co ltd
Priority date: 2021-08-19
Filing date: 2021-08-19
Publication date: 2021-12-31
Anticipated expiration: 2041-08-19
Also published as: CN113871239B

Abstract

The embodiment of the application provides a keyboard and electronic equipment, and aims to solve the problem that in the related art, each light-emitting unit of the keyboard needs to be controlled independently, so that the control process of the keyboard is complex. The keyboard provided by this embodiment sets up backlight unit to include luminescence unit, light guide plate and light-permeable look change part, and wherein, the light guide plate is located the top of base plate, and the light that the luminescence unit sent is projected to the key cap via the light guide plate, and look change part is located the light propagation path of luminescence unit to the colour that is used for making the light that the luminescence unit sent presents multiple colour, and at least one in multiple colour is the colour. Therefore, the keyboard achieves the effect of mixed color backlight and is beneficial to enriching the visual effect. Moreover, the keyboard of the embodiment can enable the keyboard to emit mixed color backlight by using the color changing component, and when the keyboard is used, the color changing of the light emitting unit is not needed to be controlled, only the light emitting unit is controlled to emit light, and the control process of the keyboard is simpler.

Description

Keyboard and electronic equipment

Technical Field

The embodiment of the application relates to the technical field of terminals, in particular to a keyboard and electronic equipment.

Background

A keyboard (Key Board) is an important input device on terminal devices such as a notebook computer (Laptop) and a tablet computer (Pad) for inputting control instructions and character information. In order to enable a user to accurately input when using these terminal devices in a light-deficient situation, some existing keyboards are provided with a light-emitting unit that can emit white light to illuminate key caps of the keyboard. However, the keypad has too single a light emitting color.

In order to bring rich visual experience to users, a light-emitting unit can be arranged under each key of the keyboard, the light-emitting unit is an RGB-LED lamp, the light-emitting units under different keys can be controlled independently, and the light-emitting colors under different keys can be different.

By arranging a large number of RGB-LED lamps, although the keyboard can have rich lighting effects, each lighting unit needs to be controlled individually, which results in a complex control process of the keyboard.

Disclosure of Invention

The embodiment of the application provides a keyboard and electronic equipment, and can solve the problem that in the prior art, each light-emitting unit of the keyboard needs to be controlled independently, so that the control process of the keyboard is complex.

A first aspect of an embodiment of the present application provides a keyboard, including: the backlight module comprises a substrate, a plurality of keys and a backlight module; each key comprises a keycap which is arranged on the substrate; backlight unit includes luminescence unit, light guide plate and light-permeable look becomes the part, the light guide plate sets up the base plate orientation one side of key cap, luminescence unit sets up the below of key cap, the light that luminescence unit sent via the light guide plate throws to on the key cap, look becomes the part setting and is in on the light propagation path of the light that luminescence unit sent, look becomes the part and is used for making the colour of the light that luminescence unit sent becomes to have first preset color and the preset color of second at least, first preset color and the preset color of second are different, just at least one of first preset color and the preset color of second is the colour.

The keyboard that this application embodiment provided, through set up backlight unit to including luminescence unit, light guide plate and light-permeable look change part, wherein, the light guide plate is located the top of base plate, and the light that luminescence unit sent throws to the key cap via the light guide plate on, and look change part sets up on luminescence unit's light propagation path to the colour that is used for making luminescence unit to send presents multiple colour, and at least one in multiple colour is the colour. Therefore, the backlight color of the keyboard is diversified and colorful, the keyboard achieves the effect of mixed color backlight, and the visual effect is enriched. Moreover, compared with the prior art that the RGB-LEDs are adopted as the light-emitting units and the keyboard emits mixed color backlight by controlling the pins of each RGB-LED, the keyboard of the embodiment can emit the mixed color backlight by using the color-changing component, and when the keyboard is used, the color of the light-emitting units does not need to be controlled, only the light-emitting units need to be controlled to emit light, and the control process of the keyboard is simpler.

In one possible embodiment, the color changing member includes at least a first light transmissive sheet configured to change the color of the light emitted from the light emitting unit to the first preset color and a second light transmissive sheet configured to change the color of the light emitted from the light emitting unit to the second preset color.

In a possible embodiment, the light emitting unit is disposed on a side of the light guide plate facing the substrate, and the color changing member is disposed between the light guide plate and the substrate, or the color changing member is disposed above the light guide plate.

In one possible embodiment, the color-changing component comprises a polyethylene terephthalate (PET) film, a UV adhesive layer is arranged on one side of the PET film facing the keycap, and a coating layer is formed on the UV adhesive layer; the color change component is arranged on one side of the light guide plate facing the keycap.

In one possible embodiment, the side of the UV glue layer facing the coating layer is provided with a groove texture.

In a possible embodiment, the light emitting unit is disposed at a side surface of the light guide plate, and the light emitted by the light emitting unit is polychromatic light; the color changing component is a dispersion prism, the dispersion prism at least has an incident surface and an emergent surface, the dispersion prism is positioned between the light emitting unit and the light guide plate, and light rays emitted by the light emitting unit are emitted into the dispersion prism from the incident surface and are emitted onto the light guide plate from the emergent surface.

In one possible embodiment, the dispersion prism is a triple prism, the triple prism is disposed on the substrate, and a bottom surface of the triple prism is in contact with the substrate.

In one possible embodiment, the light emitting unit is provided in plurality, and the plurality of light emitting units are controlled individually; the substrate is provided with a plurality of mounting areas, at least one keycap is arranged in each mounting area, and light rays emitted by each light-emitting unit are projected on the keycaps arranged in the same mounting area.

In one possible embodiment, the keycap is made of a light-transmitting material; the backlight module also comprises a pattern sheet in a preset shape, and the pattern sheet is positioned on the light propagation path and corresponds to the keycap so that the light emitted by the light-emitting unit projects the pattern in the preset shape on the keycap.

In one possible embodiment, the light emitting unit is disposed on a side of the light guide plate facing the substrate, and the pattern sheet is disposed between the light guide plate and the substrate.

In a possible embodiment, the keyboard further comprises a reflective sheet disposed below the light guide plate, the reflective sheet being configured to reflect light onto the light guide plate.

In a possible implementation manner, the keyboard further includes a light shielding sheet, the light shielding sheet is located between the keycap and the light guide plate, and a light transmission hole is formed in a position of the light shielding sheet corresponding to the keycap.

A second aspect of an embodiment of the present application provides an electronic device, including: the keyboard of any one of the aspects provided in the embodiments of the present application.

The electronic equipment provided by the embodiment of the application comprises a keyboard. The keyboard comprises a substrate, a plurality of keys and a backlight module, wherein the backlight module is arranged to comprise a light-emitting unit, a light guide plate and a light-permeable color change component, the light guide plate is arranged above the substrate, light emitted by the light-emitting unit is projected onto a keycap through the light guide plate, and the color change component is arranged on a light propagation path of the light-emitting unit so as to enable the color of the light emitted by the light-emitting unit to present multiple colors, and at least one of the multiple colors is colorful. Therefore, the backlight color of the keyboard is diversified and colorful, the keyboard achieves the effect of mixed color backlight, and the visual effect is enriched. Moreover, compared with the prior art that the RGB-LEDs are adopted as the light-emitting units and the keyboard emits mixed color backlight by controlling the pins of each RGB-LED, the keyboard of the embodiment can emit the mixed color backlight by using the color-changing component, and when the keyboard is used, the color of the light-emitting units does not need to be controlled, only the light-emitting units need to be controlled to emit light, and the control process of the keyboard is simpler.

Drawings

Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of another electronic device according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of another electronic device according to an embodiment of the present application;

fig. 4 is a schematic view of an application scenario of another electronic device according to an embodiment of the present application;

FIG. 5 is an exploded view of a keyboard according to an embodiment of the present application;

fig. 6 is a schematic partial cross-sectional view of a key of a keyboard according to an embodiment of the present application;

FIG. 7 is a schematic diagram illustrating a partial cross-sectional view of a key of another keyboard according to an embodiment of the present application;

FIG. 8 is a diagram illustrating a first layout of a plurality of light emitting cells according to an embodiment of the present disclosure;

FIG. 9 is a diagram illustrating a second layout of a plurality of light emitting cells according to an embodiment of the present disclosure;

FIG. 10 is a schematic view of another color changing component provided in an embodiment of the present application;

FIG. 11 is a schematic view of a keyboard viewed from an angle according to an embodiment of the present application;

fig. 12 is a partial cross-sectional view of a key of another keyboard according to an embodiment of the present application;

FIG. 13 is an enlarged view of a portion of FIG. 12 at A;

fig. 14 is a schematic view of a light-shielding sheet according to an embodiment of the present application;

FIG. 15 is an exploded view of a key cap and a backlight module with a pattern piece according to an embodiment of the present disclosure;

FIG. 16 is an exploded view of a key cap and a backlight module with another pattern piece according to an embodiment of the disclosure;

fig. 17 is a schematic structural diagram of another pattern piece according to an embodiment of the present application.

Description of reference numerals:

100. an electronic device;

10. a display screen;

20. a host body;

30. a tablet computer;

40. a keyboard;

41. a keyboard panel; 410. a keyhole;

42. a keyboard bottom case;

43. a substrate; 430. a first mounting area; 431. a second mounting area; 432. a third mounting area;

44. pressing a key; 440. a keycap; 440a, target viewing keycap; 441. scissor feet;

45. a backlight module; 450. a light emitting unit; 451. a light guide plate; 452. a color change member; 4520. a first light transmissive sheet; 4521. a second light transmissive sheet; 4522. a third light transmitting sheet; 4523. polyethylene terephthalate PET film; 4524. a UV adhesive layer; 4525. coating a film layer; 4526. a dispersive prism; 453. a pattern sheet; 4530. a hollow-out section;

46. a reflective sheet;

47. a shading sheet; 470. and (7) a light hole.

Detailed Description

The keyboard is widely applied to terminal devices such as notebook computers and tablet computers as the most common input device. The application scenarios of the terminal devices are diversified, for example, a user can work in a bright office with a notebook computer, or the user can play games with the notebook computer at night. Most keyboards on the market have a light-emitting unit capable of emitting white light, so that a user can clearly observe keys in dim environments such as night and the like, and accurate input is facilitated. At this time, the keyboard has only a white backlight, and is not good in appearance. However, even if the light emitting unit is set as a color light source, the keyboard can only emit monochromatic backlight, and the color is single.

A keyboard is provided in the related art, and includes a substrate and a plurality of keys, at least one light emitting unit is disposed under each key, and the light emitting units under different keys can be controlled individually. Wherein, the light-emitting unit is mostly an RGB-LED lamp. Specifically, the RGB-LED lamp is formed by mixing red, green and blue light, an R chip, a G chip and a B chip are arranged in the RGB-LED lamp, the RGB-LED lamp is provided with a first pin, a second pin, a third pin and a fourth pin, the first pin is an anode common to the R chip, the G chip and the B chip, the second pin is connected with the R chip, the third pin is connected with the G chip, and the fourth pin is connected with the B chip.

Illustratively, when the second pin is switched on, the R chip works, and the RGB-LED lamp emits red light; when the third pin is connected, the G chip works, and the RGB-LED lamp emits green light; when the fourth pin is connected, the B chip works, and the RGB-LED lamp emits blue light; when the second pin and the third pin are connected, the R chip and the G chip work, and the RGB-LED lamp emits yellow light; when the second pin and the fourth pin are connected, the R chip and the B chip work, and the RGB-LED lamp emits purple light; when the third pin and the fourth pin are connected, the G chip and the B chip work, and the RGB-LED lamp emits cyan light; when the second pin, the third pin and the fourth pin are all connected, the R chip, the G chip and the B chip work, so that the RGB-LED lamp emits light of three colors of red, green and blue at the same time, the red, green and blue lights are mixed to form white light, and the RGB-LED lamp emits the white light at the moment.

It can be seen that, in the related art, when the RGB-LED lamp is used as the light emitting unit, the light emitting unit can emit light of seven colors. When the LED lamp is used, the keyboard enables the light-emitting units to emit different colors by controlling the pins of the RGB-LED lamps. For example, a part of the light emitting units emits blue light, another part of the light emitting units emits violet light, another part of the light emitting units emits yellow light, and the remaining light emitting units emit green light. Therefore, the keyboard emits mixed color light, the light emitting color of the keyboard is not monotonous any more, and rich visual experience is brought to users. However, the inventor has found that in such a way that the keyboard emits mixed-color light, the keyboard needs to control multiple pins of each RGB-LED lamp, which results in a complicated control process of the keyboard.

In view of the above problems, the inventors thought that the dispersion prism has a characteristic of refracting the white light into seven colors, and further thought that the dispersion prism is provided on the light propagation path of the light emitting unit to color the light emitted from the light emitting unit and present a plurality of colors, and further, the keyboard can emit the color mixed light without controlling the light emitting unit to change its own color. Based on this concept, the inventors also conceived to replace the dispersion prism with a light transmissive sheet in a different color and a film layer structure capable of changing color. In these modes, the keyboard does not need to emit various colors of lights by controlling the light-emitting unit, and the control of the light-emitting unit is relatively simple. Therefore, the keyboard with rich light emitting colors and simple control process is obtained.

The embodiment of the application provides an electronic device, which may be a mobile terminal, a fixed terminal or a foldable device such as a desktop computer, a notebook computer (laptop), a tablet computer (Table), an ultra-mobile personal computer (UMPC), a handheld computer, an interphone, a netbook, a POS machine, a Personal Digital Assistant (PDA), and the like.

Fig. 1 schematically shows a three-dimensional structure of an electronic device 100 according to an embodiment. In the embodiment shown in fig. 1, the electronic device 100 may be a notebook computer. Specifically, the notebook computer may include a display screen 10 and a host 20. The display screen 10 is rotatably connected with the main body 20. For example, the display screen 10 and the host 20 may be connected by a hinge; alternatively, the display screen 10 and the host 20 may be rotatably connected by a hinge structure. Or, in some examples, the display screen 10 and the host 20 may be independent devices, for example, the display screen 10 and the host 20 are detachable, when in use, the display screen 10 is placed on the host 20, and after use, the display screen 10 and the host 20 may be separated from each other.

In order to achieve the display effect of the display panel 10, the display panel 10 and the host 20 are electrically connected, for example, the display panel 10 and the host 20 may be electrically connected through a contact, the display panel 10 and the host 20 may be electrically connected through a Flexible Printed Circuit (FPC), the display panel 10 and the host 20 may be electrically connected through a wire, and the display panel 10 and the host 20 may be wirelessly connected through a wireless signal.

Fig. 2 schematically shows a three-dimensional structure of an electronic device 100 of another embodiment. In the embodiment shown in FIG. 2, electronic device 100 may be a desktop computer. Specifically, the desktop computer may include a display screen 10 and a host 20. The display screen 10 and the host 20 are independently provided. The display screen 10 is electrically connected with the host 20 through a data line, so that the display effect of the display screen 10 is realized.

Fig. 3 schematically shows a three-dimensional structure of an electronic apparatus 100 according to still another embodiment. In the embodiment shown in fig. 3, the electronic device 100 may be a tablet computer 30. Specifically, like a notebook computer and a desktop computer, the tablet computer 30 also includes the display screen 10 and the host 20, and the display screen 10 and the host 20 are not independent but integrated together.

As can be seen from fig. 2 to 3, regardless of whether the electronic device 100 is a laptop computer, a desktop computer or a tablet computer 30, the electronic device 100 may include a keyboard 40, the keyboard 40 may provide input to the electronic device 100, and the electronic device 100 performs an operation in response to the input based on the input of the keyboard 40.

When the electronic device 100 is a notebook computer, the keyboard 40 may be disposed on the host 20. The keyboard 40 is electrically connected to the control unit inside the main body 20, and the keyboard 40 serves as an input device of the notebook computer. In use, a user may press keys on the keypad 40 to input characters or operation instructions.

When the electronic device 100 is a desktop computer, the keyboard 40 and the host 20 are independently disposed. The keyboard 40 is electrically connected to the host 20 through a data line, and the keyboard 40 can be used as an input device of a desktop computer. In other embodiments, the keyboard 40 and the host 20 may be wirelessly connected by a wireless signal (e.g., a bluetooth signal).

When the electronic device 100 is a tablet computer 30, the tablet computer 30 and the keyboard 40 may be independent devices, for example, the tablet computer 30 and the keyboard 40 may be detachable, and when the electronic device is used, the tablet computer 30 is placed on the keyboard 40, and after the use is finished, the tablet computer 30 and the keyboard 40 may be separated from each other.

Illustratively, the electrical connection between the tablet computer 30 and the keyboard 40 may be through contacts. Alternatively, the tablet pc 30 and the keyboard 40 are electrically connected by a wire. Alternatively, the tablet pc 30 and the keyboard 40 may be wirelessly connected through a wireless signal (e.g., a bluetooth signal). In the embodiment of the present application, the keyboard 40 may be, for example, a wireless keyboard shown in fig. 3.

Fig. 4 schematically shows an application scenario of the electronic device 100 according to still another embodiment. Referring to fig. 4, the tablet computer 30 and the keyboard 40 may be used by being placed at a predetermined distance from each other, and the tablet computer 30 and the keyboard 40 may be wirelessly connected through a wireless signal (e.g., a bluetooth signal), so that a user may arbitrarily adjust the placing position of the keyboard 40 according to personal use habits. In the embodiment of the present application, the keyboard 40 may be, for example, a wireless keyboard shown in fig. 3 or fig. 4.

In one embodiment, the tablet computer 30 and the keyboard 40 may be interconnected via a communication network to enable wireless signal interaction. The communication network may be, but is not limited to: a close-range communication network such as a WI-FI hotspot network, a WI-FI peer-to-peer (P2P) network, a bluetooth network, a zigbee network, or a Near Field Communication (NFC) network.

The following explains the implementation of the keyboard provided in the embodiment of the present application in detail.

Fig. 5 schematically illustrates an exploded structure of the keyboard 40 of an embodiment. Referring to fig. 5, a keyboard 40 according to an embodiment of the present disclosure includes a keyboard front case 41, a keyboard bottom case 42, a substrate 43, and a plurality of keys 44 (see fig. 6 below), where the keyboard front case 41 is disposed above the keyboard bottom case 42, the keyboard front case 41 is detachably connected to the keyboard bottom case 42, and both of them jointly define a mounting cavity, the substrate 43 is mounted in the mounting cavity (not shown), the plurality of keys 44 are all telescopically disposed on the substrate 43, and the substrate 43 can provide a supporting function for the plurality of keys 44. The keyboard panel 41 is provided with a plurality of key holes 410, and each key hole 410 corresponds to one key 44. Further, each of the keys 44 includes a key cap 440 and a scissor leg 441 (see fig. 6 described below), the scissor leg 441 is disposed below the key cap 440, and the key cap 440 is connected to the substrate 43 through the scissor leg 441. The scissors foot 441 provides good support for the key cap 440, so that the key cap 440 is evenly stressed, and the key cap 440 can be pressed down with a fixed force by a user at any height position. It is understood that the maximum cross-sectional area of the key cap 440 along the center line of the key hole 410 is smaller than the opening area of the key hole 410, and a gap is formed between the key 44 and the wall of the corresponding key hole 410, so that the key cap 440 can extend and contract in the corresponding key hole 410.

In order to enable the user to recognize the function of each key 44, a character symbol is further formed on the top surface of the key cap 440 facing away from the substrate 43, and when the key cap 440 moves down to the lowest position by the downward pressing pressure, the circuit on the substrate 43 can be turned on, thereby enabling the input of character information or control commands corresponding to the character symbol of the key cap 440. Here, the top surface of the key cap 440 facing away from the substrate 43 may be printed with character symbols using ink.

The substrate 43 may be a Flexible Printed Circuit (FPC) of the film keypad 40, a printed Circuit board made of a metal material such as aluminum or copper, or a metal plate material having a film Circuit board on a surface thereof.

Fig. 6 schematically shows a partial cross-sectional structure of one of the keys 44 of the keyboard 40. With reference to fig. 5 and 6, the keyboard 40 further includes a backlight module 45, where the backlight module 45 is disposed in the installation cavity and below the key cap 440, and is used for providing backlight for the keys 44, so that in an environment with dark light, a user can clearly observe character symbols on the corresponding keys 44, the possibility of incorrect operation of the keys 44 is reduced, and the input efficiency is improved.

The backlight module 45 includes a light emitting unit 450 and a light guide plate 451, the light guide plate 451 is disposed on a side of the substrate 43 facing the key cap 440, the substrate 43 provides power to the light emitting unit 450 to enable the light emitting unit 450 to emit light, the light emitting unit 450 is configured to enable light emitted by the light emitting unit 450 to be guided to a bottom surface of the key cap 440 facing the substrate 43 through the light guide plate 451, and a light propagation path is formed between the light emitting unit 450 and the key cap 440, as shown in fig. 6. Since a gap is formed between the key cap 440 and the key hole 410, light emitted from light rays incident on the key cap 440 can be transmitted through the gap, thereby illuminating an area around the key cap 440.

The Light Emitting unit 450 may be, for example, a Light Emitting Diode (LED), a laser, or an incandescent lamp, and the Light Emitting unit 450 can only emit Light of a single color. The color of the light emitted by the light emitting unit 450 is not limited to white, and may be yellow, red, blue, or other colors. Specifically, the light emitting unit 450 may be mounted on the light guide plate 451, or the light emitting unit 450 may be mounted on the substrate 43 as long as the light emitted from the light emitting unit 450 can be projected onto the light guide plate 451. Exemplarily, in fig. 5 and 6, the light emitting unit 450 is mounted on the substrate 43 and may be specifically positioned below the light guide plate 451, thereby forming a light propagation path that is upwardly transmitted from below the light guide plate 451. In fig. 7, the light emitting unit 450 is mounted on the substrate 43, and may be specifically positioned at a side surface of the light guide plate 451, thereby forming a light propagation path that enters the light guide plate 451 from the side surface of the light guide plate 451 and propagates upward. Fig. 7 schematically shows a partial sectional structure of a certain key 44 of another keyboard 40.

The number of the light emitting units 450 is also not limited. Exemplarily, one light emitting unit 450 may be provided. At this time, the light emitting unit 450 may be a patch LED, the patch LED is disposed on a surface of the substrate 43 facing the key caps 440 and is installed in the middle of the substrate 43, and the light of the light emitting unit 450 is emitted from the middle of the light guide plate 451 to the periphery of the light guide plate 451, so that the light emitted by the light emitting unit 450 illuminates all the key caps 440 as much as possible.

With continued reference to fig. 5, 6, and 7, the light emitting unit 450 may be provided in plurality, and each light emitting unit 450 may be individually controlled. Each light emitting unit 450 may be configured to illuminate all of the key caps 440, and in this case, redundant key caps 440 may be used as spares. Alternatively, each light-emitting unit 450 may be configured to illuminate a portion of the key cap 440, with the key cap 440 illuminated by the respective light-emitting unit 450 being different. In this way, the light of each light-emitting unit 450 can be uniformly projected onto the key cap 440 to be illuminated by the light-emitting unit 450, so as to prevent the backlight of the key cap 440 close to the light-emitting unit 450 from being too bright and the backlight of the key cap 440 far from the light-emitting unit 450 from being insufficient in brightness.

Fig. 8 schematically shows a first layout of a plurality of light emitting cells 450. In the present embodiment, as shown in fig. 8, a plurality of mounting

regions

430, 431, 432 may be defined on the substrate 43, a plurality of light guiding regions (not shown) may be defined on the light guiding plate 451, the shape of each light guiding region is adapted to the shape of one mounting region, the mounting regions correspond to the light guiding regions and the light emitting units 450 one by one, and the light emitted by each light emitting unit 450 can be incident into one light guiding region of the light guiding plate 451 and projected onto the key cap 440 mounted on the same mounting region of the substrate 43 by the light guiding plate 451. Thus, each light-emitting unit 450 is used for illuminating the key cap 440 in one installation area, and each light-emitting unit 450 can be opened and closed, so that the key caps 440 in each installation area can be independently illuminated to meet the requirements of users in various scenes.

It is understood that at least one key cap 440 is provided in each mounting region to enable the light emitting unit 450 corresponding to each mounting region to function. The preferred implementation of this embodiment is: a plurality of key caps 440 are disposed within the mounting region, and each light emitting unit 450 is for illuminating the plurality of key caps 440 within the corresponding mounting region. Compared with the case that one key cap 440 is disposed in the mounting region and each light-emitting unit 450 is used for illuminating one key cap 440, in the present embodiment, there is no need to dispose one light-emitting unit 450 for each key 44, which reduces the number of light-emitting units 450, thereby facilitating to reduce the manufacturing cost of the keyboard 40 and simplifying the structure of the keyboard 40.

For example, in fig. 8, three mounting regions may be defined on the substrate 43, the three mounting regions are a first mounting region 430, a second mounting region 431, and a third mounting region 432, and the first mounting region 430, the second mounting region 431, and the third mounting region 432 are sequentially disposed along the length direction of the substrate 43. Accordingly, the light guide plate 451 is divided into three light guide regions, three light emitting units 450 are provided, and the three light emitting units 450 are all mounted on the substrate 43, and the light emitted from the three light emitting units 450 is projected into the light guide plate 451 from the lower portion of the corresponding light guide region. When the key cap is used, only the light-emitting units 450 located in the first installation area 430 can be controlled to emit light, and the other two light-emitting units 450 are in an off state, and at this time, only the key cap 440 corresponding to the first installation area 430 has backlight.

Fig. 9 schematically shows a second layout of a plurality of light emitting cells 450. Of course, in some embodiments, as shown in fig. 9, the substrate 43 may also divide the mounting area according to the row where the keys 44 are located, that is, the area of each row of keys 44 corresponding to the substrate 43 is a mounting area. Accordingly, the number of the light emitting units 450 may be identical to the number of rows of the keys 44. Wherein one row refers to one row of the substrate 43 in the length direction. For example, in fig. 9, the keys 44 are arranged in 6 rows, the light emitting units 450 are provided in 6, 6 light emitting units 450 are each provided on the substrate 43 and located at the side of the light guide plate 451, and each light emitting unit 450 corresponds to one row of keys 44. When the light emitting device is used, only the middle two light emitting units 450 can be controlled to emit light, and the other four light emitting units 450 are in an off state, and at the moment, only the two rows of key caps 440 in the middle have backlight. Of course, the plurality of light emitting units 450 may be arranged in other manners, and the embodiment is not listed here.

It is understood that the light emitting unit 450 may be regarded as a point light source regardless of whether the light emitting unit 450 is an LED, a laser, or an incandescent lamp, and the light emitted therefrom may be diffused through the light guide plate 451 to form a surface light source. That is, the light guide plate 451 functions to uniformize light. The light guide plate 451 may be made of acrylic, Polycarbonate (PC) or polymethyl methacrylate (PMMA), so that the light guide plate 451 has good optical performance, and light can be diffusely reflected in the light guide plate 451 to be uniformly projected onto the key cap 440.

With continued reference to fig. 5, 6 and 7, the backlight module 45 further includes a color changing component 452, the color changing component 452 is disposed on a light propagation path of the light emitted from the light emitting unit 450, and the color changing component 452 is used for changing the color of the light emitted from the light emitting unit 450. After the light emitted by the light emitting unit 450 passes through the color changing member 452, the color of the light can be changed to at least a first preset color and a second preset color, the first preset color is not consistent with the second preset color, and at least one of the first preset color and the second preset color is a color. Thus, the backlight color of the keyboard 40 is diversified and colorful, so that the keyboard 40 achieves the effect of mixed color backlight, and compared with the keyboard 40 emitting monochromatic backlight in the related art, the keyboard 40 in the embodiment has the advantages of more dazzling light emitting color, good visual effect and good aesthetic property, thereby being beneficial to improving the competitiveness of the keyboard 40 in the market. Moreover, compared with the related art that the RGB-LEDs are used as the light emitting units 450 and the keyboard 40 emits the mixed-color backlight by controlling the pins of each RGB-LED, the keyboard 40 of the embodiment can emit the mixed-color backlight by using the color changing component 452, and when the keyboard is used, only the light emitting units 450 need to be controlled to emit light, and the light emitting units 450 do not need to be controlled to change the color of the emitted light, so that the control process of the keyboard 40 is simpler.

It should be noted that the color changing member 452 is made of a transparent material, so that the color changing member 452 does not obstruct the transmission of the light emitted from the light emitting unit 450, so that the light emitted from the light emitting unit 450 can be smoothly projected onto the key cap 440, thereby ensuring that the key cap 440 can be illuminated.

Specifically, the structure of the color changing component 452 may include, but is not limited to, the following possible implementations:

in a first possible implementation manner, as shown in fig. 8, the color changing component 452 at least includes a first light-transmitting sheet 4520 and a second light-transmitting sheet 4521, the first light-transmitting sheet 4520 enables the color of the light emitted by the light-emitting unit 450 to be changed into a first preset color, and the second light-transmitting sheet 4521 enables the color of the light emitted by the light-emitting unit 450 to be changed into a second preset color.

As can be seen from the foregoing description, one or more light-emitting units 450 may be provided, and the color of the light emitted by the light-emitting units 450 is not limited to white, and may also be colored. In this embodiment, when the light emitting unit 450 is a white light source, the first light-transmitting sheet 4520 is configured to have a first preset color and the second light-transmitting sheet 4521 is configured to have a second preset color, regardless of whether the light emitting unit 450 is one or more, that is, the first light-transmitting sheet 4520 and the second light-transmitting sheet 4521 have different colors. For example, when the first predetermined color is red and the second predetermined color is blue, the first light-transmitting sheet 4520 is a red sheet, the white light ray can show red after passing through the first light-transmitting sheet 4520, the second light-transmitting sheet 4521 is a blue sheet, and the white light ray can show blue after passing through the second light-transmitting sheet 4521. It can be seen that the backlight module 45 in this example can make the keyboard 40 emit colorful backlight only by using the color changing component 452, and does not need to use a colorful light source as the light emitting unit 450, which is helpful to solve the problem that the control process of the keyboard 40 is too complicated because the light emitting unit 450 is set as an RGB-LED lamp.

When the light emitting unit 450 is a color light source, if there is one light emitting unit 450, the first light transmissive plate 4520 and the second light transmissive plate 4521 have different colors, so that the color of light passing through the first light transmissive plate 4520 is different from the color of light passing through the second light transmissive plate 4521, and the light passes through the first light transmissive plate 4520 and the second light transmissive plate 4521 respectively. For example, when the light emitting unit 450 is a red light source, the first predetermined color is yellow, and the second predetermined color is purple, the first light-transmitting sheet 4520 is set to be a green sheet to make red light yellow after passing through the first light-transmitting sheet 4520 is set to be a blue sheet to make red light purple after passing through the first light-transmitting sheet 4520.

When the light emitting units 450 are color light sources, if the light emitting units 450 are multiple and the light colors of the light emitting units 450 are different, the colors of the first light-transmitting sheet 4520 and the second light-transmitting sheet 4521 may be different or the same according to the specific color of the light emitting units 450, the first preset color, and the second preset color. For example, when there are two light emitting units 450, the two light emitting units 450 are a green light source and a blue light source, respectively, the first preset color is yellow, and the second preset color is purple, the first light-transmitting sheet 4520 and the second light-transmitting sheet 4521 may be red, respectively. In this example, the backlight module 45 is used to make the keyboard 40 emit backlight with a first preset color and a second preset color by mixing the color of the colored light source with the color of the color changing part 452.

It is understood that, in the first possible implementation manner, the color-changing member 452 may be installed below the light guide plate 451, or may be installed above the light guide plate 451, according to the installation position of the light emitting unit 450. Specifically, when the light emitting unit 450 is a patch LED disposed on a surface of the substrate 43 facing the key cap 440, the color changing component 452 may be disposed between the substrate 43 and the light guide plate 451, and at this time, light is changed in color by the color changing component 452 and then is transmitted through the light guide plate 451; when the light emitting unit 450 emits light into the light guide plate 451 from a side surface of the light guide plate 451, the color changing member 452 may be disposed above the light guide plate 451, and at this time, the light is transmitted through the light guide plate 451 and then changed in color through the color changing member 452.

Referring to fig. 8, an exemplary operation principle of the keyboard 40 in the present embodiment is as follows: light emitted by the light emitting unit 450 is projected onto the first light transmitting piece 4520 and the second light transmitting piece 4521, light passing through the first light transmitting piece 4520 is in a first preset color, light passing through the second light transmitting piece 4521 is in a second preset color, the light in the first preset color is projected onto a part of the keycaps 440 through the light guide plate 451, so that the part of the keycaps 440 presents backlight in the first preset color, and the light in the second preset color is projected onto the rest of the keycaps 440 through the light guide plate 451, so that the rest of the keycaps 440 presents backlight in the second preset color.

Of course, in other embodiments, the number of the light-transmissive sheets included in the color changing member 452 may be reasonably designed according to the mounting regions divided by the substrate 43, so that each mounting region corresponds to one light-transmissive sheet. Specifically, in the example shown in fig. 8, three light emitting units 450 are provided on the substrate 43, in which the first mounting region 430, the second mounting region 431, and the third mounting region 432 are divided, and in this case, the color change member 452 may include a first light-transmissive sheet 4520, a second light-transmissive sheet 4521, and a third light-transmissive sheet 4522. White light emitted by one of the three light emitting units 450 is switched into light of a first preset color through the first light transmissive sheet 4520 and is projected onto the key caps 440 in the first installation region 430, so that the key caps 440 in the first installation region 430 emit backlight of the first preset color; white light emitted by another one of the three light emitting units 450 is switched into light of a second preset color through the second light transmissive sheet 4521 and is projected onto the key caps 440 in the second installation region 431, so that the key caps 440 in the second installation region 431 are backlit by the second preset color; the white light emitted from the last of the three light emitting units 450 is switched to light of a third preset color by the third light-transmitting sheet 4522 and is projected onto the key caps 440 in the third mounting area 432, so that the key caps 440 in the third mounting area 432 are backlit by the third preset color. The third preset color is not limited, and the third preset color may be the same as or different from the first preset color, or the same as or different from the second preset color. In this way, a plurality of areas can be formed on the keyboard 40, and the backlight colors of different areas are different, so as to meet the personalized requirements of users.

It should be further noted that, in the present embodiment, the color changing component 452 may be a split structure. Or, the color changing component 452 may also be an integrated structure, that is, the plurality of light transmitting sheets, such as the first light transmitting sheet 4520 and the second light transmitting sheet 4521, may be formed as an integrated piece through an integrated molding process, so that on the premise that the cost of the color changing component 452 is not increased, the structural strength of the color changing component 452 may be effectively improved, the installation process of the color changing component 452 is simplified, and the improvement of the installation efficiency is facilitated.

The first light-transmitting piece 4520, the second light-transmitting piece 4521 and other light-transmitting pieces may be made of transparent materials, for example, the light-transmitting

pieces

4520 and 4521 may be made of acrylic, transparent polypropylene (PP), transparent polyvinyl chloride (PVC) and other transparent plastics. Alternatively, the light-transmitting sheets such as the first light-transmitting sheet 4520 and the second light-transmitting sheet 4521 may be a polyethylene terephthalate PET film, which is thin and soft, has high light transmittance, allows light to smoothly pass through the color changing member 452, and has good toughness and conformability. In addition, the color of the light-transmitting

sheets

4520, 4521 may be formed by a spray process or a plating process.

In a second possible implementation manner, referring to fig. 10, the color-changing component 452 may be a polyethylene terephthalate PET film 4523, the polyethylene terephthalate PET film 4523 has a lower surface and an upper surface which are oppositely arranged, a UV glue layer 4524 is attached to the upper surface of the polyethylene terephthalate PET film 4523, and a plating layer 4525 is formed on the UV glue layer 4524. Fig. 10 schematically shows the structure of another color changing member 452.

The coating 4525 may specifically refer to a structure in the related art, that is, the coating 4525 may include a plurality of first films (not shown) and a plurality of second films (not shown), the refractive index of the second films is higher than that of the first films, and the first films and the second films are alternately stacked. For example, the first film layer may be SiO₂The second film layer may be Ti₃O₅And (5) film layer. In this way, light is repeatedly increased and decreased as it passes through the coating layer to achieve that the coating layer 4525 observed at the same angle can simultaneously exhibit a plurality of colors. The film-coated layer 4525 may be formed on the polyethylene terephthalate PET film 4523 by optical film coating, ion film coating, magnetron sputtering film coating, or the like.

It is understood that when the light emitting unit 450 is a white light source, the coating 4525 is configured to make the white light at least exhibit two colors, namely a first predetermined color and a second predetermined color, so as to ensure that when the color changing component 452 is observed at a certain angle, the light emitted by the light emitting unit 450 passes through the coating 4525 to exhibit at least the first predetermined color and the second predetermined color. Similarly, when the light emitting unit 450 is a color light source, the coating layer 4525 may be configured to enable the white light to exhibit at least two colors, i.e., a fourth preset color and a fifth preset color, and the light color of the light emitting unit 450 may be mixed with the fourth preset color to obtain the first preset color, and the light color of the light emitting unit 450 may be mixed with the fifth preset color to obtain the second preset color.

Through with polyethylene terephthalate PET membrane 4523, UV glue film 4524 and coating layer 4525 from supreme stack setting in proper order down for the colour change part 452 forms the rete structure that has special optical effect, for example laser film or dazzle membrane, and laser film or the surface of dazzling membrane all have the bright gloss of dazzling. Another exemplary operating principle of the keyboard 40 in this embodiment is: light emitted by the light emitting unit 450 is incident into the light guide plate 451, the light is uniformly emitted from the light guide plate 451 to the polyethylene terephthalate PET film 4523 with the coating layer 4525, the light penetrating out of the coating layer 4525 presents various colors, the light of the various colors is projected on the key cap 440 and penetrates out of a gap between the key cap 440 and the key hole 410, and accordingly backlight of the keyboard 40 presents various colors, and mixed-color backlight is achieved.

With the above arrangement, the color changing member 452 has a color changing property, and at least two different colors can be observed when the color changing member 452 is observed at the same angle. Therefore, when the keys 44 of the keypad 40 are viewed from a certain angle, the user can observe the light rays of various colors transmitted from the color changing member 452. It is thus clear that in this embodiment, not only keyboard 40 can demonstrate mixed colors and be shaded, even the backlight under key cap 440 also has multiple colours, also can form mixed colors and be shaded under key cap 440 promptly for keyboard 40's light effect is abundanter, more dazzles beautiful, has promoted the outward appearance competitiveness of product greatly.

Fig. 11 schematically shows an application scenario in which the keyboard 40 is viewed from an angle. Taking the orientation shown in fig. 11 as an example, fig. 11 shows five key caps 440, wherein one key cap 440 is disposed adjacent to each of the left and right sides and the front and rear sides of one key cap 440, and for convenience of description, the key cap 440 located in the middle of the five key caps 440 is referred to as a target observation key cap 440 a. As shown in fig. 11, it is assumed that when a local region of the plating layer 4525 between the target observation key cap 440a and the key cap 440 disposed on the right side of the target observation key cap 440a is observed from a predetermined direction, the plating layer 4525 assumes blue and purple colors. An observation angle formed between the preset direction and the central line P of the target observation keycap 440a is θ, and θ is greater than 0 ° and less than 90 °. Based on this, when the user projects a line of sight in a preset direction to an area between the target observation keycap 440a and the keycap 440 arranged at the right side of the target observation keycap 440a, the user can observe the color of the coating layer 4525 appearing at the observation angle θ, that is, the user can see blue light and purple light.

Further, a side of the UV glue layer 4524 facing the plating layer 4525 may be formed with a groove texture (not shown). Wherein the groove texture can play a role of diffuse reflection. Therefore, on one hand, the light-homogenizing effect on the light of the light-emitting unit 450 is further enhanced, so that the light guided to the film-coated layer 4525 is more uniform, and on the other hand, the color of the light after diffuse reflection is more obvious along with the change of angles, so that the color-changing effect of the film-coated layer 4525 is more obvious.

It is noted that in the second possible implementation manner, the color change component 452 is installed above the light guide plate 451 and disposed close to the key cap 440, that is, the color change component 452 is disposed between the key cap 440 and the light guide plate 451. In this example, since the color changing component 452 changes color by using the coating layer 4525 to present a plurality of colors at the same angle, the coating layer 4525 is prevented from being shielded by disposing the color changing component 452 close to the key cap 440, thereby ensuring that a user can see light of different colors generated by the changed light color of the coating layer 4525 after adjusting the viewing angle.

In a third possible implementation manner, referring to fig. 12 and 13, the color changing component 452 may also be a dispersion prism 4526, and the dispersion prism 4526 can disperse the polychromatic light, so as to decompose the polychromatic light into a plurality of monochromatic lights. In this embodiment, the dispersing prism 4526 is disposed on the light propagation path between the light emitting unit 450 and the light guide plate 451, so that the light emitted from the light emitting unit 450 is dispersed before propagating through the light guide plate 451. It is advantageous to prevent the light uniformly dispersed from the light guide plate 451 from being converged again into the dispersion prism 4526, as compared with the case where the dispersion prism 4526 is disposed between the light guide plate 451 and the key cap 440. Fig. 12 schematically shows a partial sectional structure of a certain key 44 in another keyboard 40, and fig. 13 is a partial enlarged view of a portion a in fig. 12.

The dispersing prism 4526 is configured to refract the light emitted from the light emitting unit 450 onto the light guide plate 451. Specifically, the dispersing prism 4526 has at least an incident surface and an exit surface, light emitted by the light emitting unit 450 enters the dispersing prism 4526 from the incident surface to be dispersed, and monochromatic light with multiple colors is obtained, and the monochromatic light is projected onto the light guide plate 451 from the exit surface of the dispersing prism 4526 and finally guided onto the key cap 440, so that the periphery of the key cap 440 presents multiple colors, and the keyboard 40 can achieve the effect of mixed color backlight.

With this arrangement, the keyboard 40 provided by the present embodiment utilizes the dispersion characteristic of the dispersion prism 4526 to change the color of the light-emitting unit 450, and the color change principle is simple without performing complicated control on the light-emitting unit 450.

It is easily understood that the light emitted from the light emitting unit 450 is polychromatic light, so that the light emitted from the light emitting unit 450 can be dispersed by the dispersing prism 4526.

For example, the light emitting unit 450 is a white light source, white light is irradiated to the incident surface of the dispersion prism 4526, at this time, the dispersion prism 4526 refracts light of seven colors of red, orange, yellow, cyan, blue and violet, the light of the seven colors exits the dispersion prism 4526 from the exit surface, and light of at least two colors of the seven colors can be incident into the light guide plate 451. In this example, the first and second predetermined colors are each selected from seven colors, red, orange, yellow, green, cyan, blue, violet.

The position of the dispersing prism 4526, the position of the light emitting unit 450, and the light emitting angle are reasonably designed, and the purpose is to adjust the exit position and the exit direction of the light from the exit surface by adjusting the projection position and the projection direction of the light on the dispersing prism 4526, so that as much monochromatic light as possible of the seven-color light refracted by the dispersing prism 4526 can enter the light guide plate 451. Preferably, when the light emitting unit 450 is a white light source, the dispersing prism 4526 is configured to project all seven colors of light into the light guide plate 451. In this way, the backlight of the keyboard 40 can be presented in seven colors to bring about a rich visual effect for the user.

For another example, the light emitting unit 450 may be a yellow light source, and the yellow light is irradiated to the incident surface of the dispersing prism 4526, and at this time, the light of two colors of red and green is refracted from the dispersing prism 4526 out of the dispersing prism 4526 from the dispersing prism 4526, and the red light and the green light are emitted from the exit surface out of the dispersing prism 4526 and into the light guide plate 451. In this example, the first and second preset colors are red and green, respectively. Of course, in other embodiments of the present application, the light emitting unit 450 may also be a violet light and a cyan light, and the color changing principle is the same as that when the light emitting unit 450 is a yellow light source, which is not described herein again.

The dispersive prism 4526 may be a prism, a pentagonal prism, a hexagonal prism, or the like, which is not limited in this embodiment. In the example shown in fig. 12 and 13, the dispersion prism 4526 is a triangular prism having a bottom surface in addition to the incident surface and the exit surface, and the triangular prism may be placed on the substrate 43 with the bottom surface of the triangular prism attached to a side of the substrate 43 facing the key cap 440 such that the triangular prism is mounted on the substrate 43 and located at a side of the light guide plate 451. Thus, the substrate 43 can support the triangular prism, and the mounting stability of the triangular prism is improved.

It is to be understood that the dispersion prism 4526 may be provided in one or more number as long as the light emitted from the light emitting unit 450 can be incident on the dispersion prism 4526. When a plurality of light-emitting units 450 and a plurality of dispersion prisms 4526 are provided, each dispersion prism 4526 may be used to match with one light-emitting unit 450 to propagate and disperse light emitted by the light-emitting unit 450; alternatively, when a plurality of light-emitting units 450 are provided and one dispersing prism 4526 is provided, the plurality of light-emitting units 450 share the same dispersing prism 4526.

Fig. 14 schematically shows the structure of the light-shielding sheet 47. With continued reference to fig. 6, 7, 12 and 14, the keyboard 40 may further include a light shielding sheet 47, the light shielding sheet 47 is disposed above the light guide plate 451 and below the key caps 440, the light shielding sheet 47 is provided with a plurality of light holes 470, each light hole 470 corresponds to one key cap 440, so that the light emitted from the light emitting unit 450 can be projected onto the key cap 440 through the light hole 470. The light shielding sheet 47 may be made of opaque plastic or an opaque film, which is not limited in this embodiment. With such an arrangement, the light shielding sheet 47 is not transparent except for the position of the light hole 470, and the light emitted from the light emitting unit 450 can only be emitted to the key cap 440 through the light hole 470, so as to prevent the keyboard 40 from being backlit even at the position where the key cap 440 is not disposed.

It should be noted that when the color changing component 452 is composed of the

light transmitting sheets

4520, 4521, 4522 or when the color changing component 452 is a film structure, the light shielding sheet 47 may be located above the color changing component 452, so that the light passes through the light transmitting hole 470 after being changed in color by the color changing component 452; alternatively, the light-shielding sheet 47 may be disposed between the color changing member 452 and the light guide plate 451, so that only a part of light passing through the light-transmitting hole 470 can be changed in color by passing through the color changing member 452.

Further, the orthographic projection area of the key cap 440 facing the light shielding sheet 47 is larger than that of the light transmission hole 470. In other words, the cross-sectional area of the key cap 440 along the center line of the light-transmissive hole 470 is larger than the opening area of the light-transmissive hole 470 corresponding to the key cap 440, i.e., the size of the light-transmissive hole 470 is smaller than the size of the corresponding key cap 440. So set up, receive sheltering from of key cap 440, the difficult direct observation of user light trap 470, and then be favorable to solving the light that jets out from light trap 470 and directly jet into user's eye and lead to dazzling problem to reached and made the soft effect in a poor light.

On the basis of the above embodiments, as shown in fig. 6 and 12, the backlight module 45 further includes a pattern sheet 453 having a preset shape, and the pattern sheet 453 is disposed on the light propagation path and corresponds to the key cap 440, so that the light emitted from the light emitting unit 450 projects a pattern having a preset shape on the key cap 440. The pattern piece 453 is made of opaque material, and an orthographic projection area of the pattern piece 453 facing the light shielding piece 47 is smaller than an opening area of the light transmitting hole 470, so that the pattern in the preset shape can be completely projected on the key cap 440.

In the first case, as shown in fig. 6, if the light emitting unit 450 is disposed below the light guide plate 451, the pattern sheet 453 may be disposed above the light guide plate 451 or may be disposed between the substrate 43 and the light guide plate 451. Fig. 15 schematically shows an exploded structure of the backlight module 45 provided with a pattern piece 453 and the key cap 440. Referring to fig. 15, taking the example that the pattern sheet 453 is disposed between the substrate 43 and the light guide plate 451, the key cap 440 forms a pattern of a predetermined shape on the basis of the following principle: the light emitted from the light emitting unit 450 travels upward and passes through the pattern piece 453, and because the pattern piece 453 is opaque, the light is projected upward onto the light guide plate 451 from the edge of the pattern piece 453, and no light passes through the portion of the light guide plate 451 corresponding to the pattern piece 453, and the light continues to travel upward and be projected onto the key cap 440, and the portion of the key cap 440 corresponding to the light guide plate 451 not emitting light is shaded, that is, the portion of the key cap 440 corresponding to the pattern piece 453 is not irradiated by the light, so that the key cap 440 presents a pattern in accordance with the shape of the pattern piece 453.

In the second case, if the light emitting unit 450 is disposed at the side of the light guide plate 451, the pattern sheet 453 is disposed above the light guide plate 451. When the color changing member 452 is composed of the

light transmitting sheets

4520, 4521, 4522 or when the color changing member 452 is a film structure, the pattern sheet 453 may be particularly disposed between the color changing member 452 and the light guide plate 451.

As can be seen from the above two cases, the pattern sheet 453 may be disposed between the substrate 43 and the light guide plate 451 or between the color change member 452 and the light guide plate 451 according to the disposition of the light emitting unit 450. That is, the pattern sheet 453 may be disposed on one surface of the light guide plate 451 facing the key cap 440, or may be disposed on the other surface of the light guide plate 451 facing away from the key cap 440. The pattern sheet 453 may be bonded to the light guide plate 451.

The predetermined shape may be, for example, a pattern, an animal shape, a love shape, and the like, which is not limited in this embodiment. When the preset shape is a pattern, the key cap 440 is mapped to form a pattern, which is favorable for improving the aesthetic property of the keyboard 40, enriching the visual effect of the user, and greatly improving the competitiveness of the keyboard 40 in appearance.

Fig. 16 schematically shows an exploded structure of the backlight module 45 provided with another pattern piece 453 and the key cap 440, and fig. 17 schematically shows a three-dimensional structure of another pattern piece 453. Further, as shown in fig. 16 and 17, a hollow 4530 may be provided on the pattern piece 453. By such design, the light emitted by the light emitting unit 450 can pass through the hollow-out portion 4530 and be projected onto the key cap 440, and the pattern formed on the key cap 440 and having the preset shape is also hollow out, so that the pattern on the key cap 440 is more vivid, and the light projected onto the key cap 440 is increased, so that the backlight of the key cap 440 is brighter.

In addition, as shown in fig. 6, 7 and 12, the keypad 40 may further include a reflective sheet 46, the reflective sheet 46 being disposed below the light guide plate 451 and between the substrate 43 and the light guide plate 451, the reflective sheet 46 serving to transmit all light incident into the light guide plate 451 upward without being reflected downward onto the substrate 43. For example, the reflective sheet 46 may be made of a plastic material.

In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, a fixed connection, an indirect connection via an intermediary, a connection between two elements, or an interaction between two elements. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

Reference throughout this specification to apparatus or components, in embodiments or applications, means or components must be constructed and operated in a particular orientation and therefore should not be construed as limiting the present embodiments. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically stated otherwise.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the embodiments of the application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The term "plurality" herein means two or more. The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship; in the formula, the character "/" indicates that the preceding and following related objects are in a relationship of "division".

It is to be understood that the various numerical references referred to in the embodiments of the present application are merely for descriptive convenience and are not intended to limit the scope of the embodiments of the present application.

It should be understood that, in the embodiment of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiment of the present application.

Claims

1. A keyboard, comprising:

a substrate;

a plurality of keys, each of the keys comprising a keycap disposed on the substrate;

backlight unit, backlight unit includes luminescence unit, light guide plate and light-permeable look becomes the part, the light guide plate sets up the base plate is towards one side of key cap, luminescence unit sets up the below of key cap, the light that luminescence unit sent via the light guide plate throws to on the key cap, look becomes the part setting and is in on the light propagation path of the light that luminescence unit sent, look becomes the part and is used for making the colour of the light that luminescence unit sent becomes to have first preset color and second preset color at least, first preset color and second preset color are different, just at least one of first preset color and second preset color is the colour.

2. The keyboard of claim 1, wherein the color changing member comprises at least a first light transmissive sheet configured to change the color of the light emitted from the light emitting unit to the first preset color and a second light transmissive sheet configured to change the color of the light emitted from the light emitting unit to the second preset color.

3. The keyboard of claim 2, wherein the light emitting unit is disposed on a side of the light guide plate facing the substrate, and the color changing member is disposed between the light guide plate and the substrate, or the color changing member is disposed above the light guide plate.

4. The keyboard of claim 1, wherein the color changing component comprises a polyethylene terephthalate (PET) film, a UV glue layer is arranged on one side of the PET film facing the keycap, and a coating layer is formed on the UV glue layer;

the color change component is arranged on one side of the light guide plate facing the keycap.

5. The keyboard as claimed in claim 4, wherein the UV glue layer has a groove texture formed on a surface facing the coating layer.

6. The keyboard of claim 1, wherein the light emitting unit is disposed at a side surface of the light guide plate, and the light emitted from the light emitting unit is polychromatic light;

the color changing component is a dispersion prism, the dispersion prism at least has an incident surface and an emergent surface, the dispersion prism is positioned between the light emitting unit and the light guide plate, and light rays emitted by the light emitting unit are emitted into the dispersion prism from the incident surface and are emitted onto the light guide plate from the emergent surface.

7. The keyboard of claim 6, wherein the dispersive prism is a triple prism disposed on the substrate with a bottom surface of the triple prism in contact with the substrate.

8. The keyboard according to any one of claims 2 to 7, wherein a plurality of the light emitting units are provided and are individually controlled;

the substrate is provided with a plurality of mounting areas, at least one keycap is arranged in each mounting area, and light rays emitted by each light-emitting unit are projected on the keycaps arranged in the same mounting area.

9. The keyboard as claimed in any one of claims 1 to 8, wherein the keycap is made of a light transmissive material;

the backlight module also comprises a pattern sheet in a preset shape, and the pattern sheet is positioned on the light propagation path and corresponds to the keycap so that the light emitted by the light-emitting unit projects the pattern in the preset shape on the keycap.

10. The keyboard of claim 9, wherein the light emitting unit is disposed on a side of the light guide plate facing the substrate, and the pattern sheet is disposed between the light guide plate and the substrate.

11. The keyboard according to any one of claims 1 to 10, further comprising a reflective sheet disposed below the light guide plate, the reflective sheet being configured to reflect light onto the light guide plate.

12. The keyboard according to any one of claims 1 to 11, further comprising a light shielding sheet, wherein the light shielding sheet is located between the keycap and the light guide plate, and a light hole is formed in a position of the light shielding sheet corresponding to the keycap.

13. An electronic device, comprising: a keyboard as claimed in any one of claims 1 to 12.