CN113972084A - Backlight module and luminous keyboard - Google Patents
Backlight module and luminous keyboard Download PDFInfo
- Publication number
- CN113972084A CN113972084A CN202010724806.0A CN202010724806A CN113972084A CN 113972084 A CN113972084 A CN 113972084A CN 202010724806 A CN202010724806 A CN 202010724806A CN 113972084 A CN113972084 A CN 113972084A
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- Prior art keywords
- light
- backlight module
- layer
- ink coating
- light source
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
- H01H13/83—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by legends, e.g. Braille, liquid crystal displays, light emitting or optical elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2219/00—Legends
- H01H2219/054—Optical elements
- H01H2219/06—Reflector
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2219/00—Legends
- H01H2219/054—Optical elements
- H01H2219/062—Light conductor
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- Push-Button Switches (AREA)
Abstract
The invention discloses a backlight module which is used for providing light for illuminating a plurality of keys of a luminous keyboard. The backlight module comprises a substrate layer, a plurality of light sources, a light guide layer, a protective layer and a plurality of dimming layers. The plurality of light sources are arranged on the substrate layer. The plurality of light sources respectively correspond to the plurality of keys. The light guide layer is provided with a plurality of openings and is arranged on the substrate layer, and the plurality of openings are respectively aligned with the plurality of light sources. The protective layer is arranged between the substrate layer and the light guide layer. The protective layer has a plurality of raised areas. One of the plurality of raised areas is embedded into the corresponding opening hole to cover the corresponding light source. One of the dimming layers is arranged in the corresponding bump area and is used for adjusting the illumination range of the corresponding light source. The backlight module of the invention can make the brightness of the central area and the peripheral area of the luminous key uniform without additionally increasing the structural thickness.
Description
Technical Field
The present invention relates to a backlight module and a light-emitting keyboard, and more particularly, to a backlight module and a light-emitting keyboard thereof capable of providing a better light-emitting uniformity.
Background
In a conventional light emitting keyboard, a light emitting diode is disposed under a key, and a protective layer and a light guide layer are disposed between the key and the light emitting diode. The protective layer is made of light-transmitting material, and light emitted by the light-emitting diode penetrates through the protective layer and is projected to the key. Generally, the led is placed directly under the key, and the illumination light of the led will make the central area of the key have the maximum brightness, and the peripheral area of the key is much dimmer. In order to solve the defect, the traditional light-emitting keyboard is provided with a light guide layer below the peripheral area of the key, and the light guide layer can guide part of light rays to project to the peripheral area of the key; however, the solution still cannot effectively overcome the problem of uneven brightness of the keys in the central area and the peripheral area, so how to design a backlight module and a light-emitting keyboard which can make the brightness of the central area and the peripheral area of the light-emitting keys even without additionally increasing the structural thickness is one of the development targets of the related mechanism design industry.
Disclosure of Invention
In view of the problems in the prior art, the present invention provides a backlight module and a light-emitting keyboard to solve the above problems.
Therefore, an object of the present invention is to provide a backlight module for providing light to illuminate a plurality of keys, the backlight module comprising:
the substrate layer is provided with a plurality of lines;
the plurality of light sources are arranged on the substrate layer, respectively correspond to the plurality of keys and are electrically connected with the plurality of circuits;
the light guide layer is provided with a plurality of openings and is arranged on the substrate layer, and the plurality of openings are respectively aligned with the plurality of light sources;
the protective layer is arranged between the substrate layer and the light guide layer and is provided with a plurality of raised areas, one of the raised areas is embedded into the corresponding opening hole so as to cover the corresponding light source, the raised areas are provided with a first surface and a second surface which are opposite, and the second surface faces the corresponding light source; and
each light modulation layer is arranged on at least one of the first surface and the second surface of the corresponding bump area and used for adjusting the illumination range of the corresponding light source projected to the corresponding key.
As an optional technical solution, one of the dimming layers comprises a reflective ink coating layer disposed on the first surface or the second surface.
As an optional technical solution, one of the dimming layers further includes a light-shielding ink coating disposed right above the corresponding light source, and an area of the light-shielding ink coating is smaller than an area of the light-reflecting ink coating.
As an optional technical solution, one of the plurality of dimming layers includes a light-shielding ink coating layer disposed on the first surface or the second surface.
As an optional technical solution, one of the dimming layers further includes a reflective ink coating disposed right above the corresponding light source, and an area of the reflective ink coating is smaller than an area of the light-shielding ink coating.
As an optional technical solution, at least one of the plurality of light modulation layers includes a light guide microstructure disposed on the first surface corresponding to the raised region.
As an optional technical solution, at least one of the plurality of light modulation layers includes a light guide microstructure disposed on the first surface corresponding to the raised region.
As an optional technical solution, a projection of one of the plurality of light modulation layers on the substrate layer is a symmetrical shape.
The invention also provides a light-emitting keyboard, which comprises:
a plurality of keys; and
the backlight module is provided.
As an optional technical solution, the light-emitting keyboard further comprises a light shielding sheet, and the light shielding sheet is disposed between the plurality of keys and the backlight module.
The backlight module and the light-emitting keyboard are characterized in that the light adjusting layer is arranged on the single surface or two opposite surfaces of the protective layer corresponding to the raised area of the light source, and the light quantity entering the light guiding layer is improved by utilizing the light reflecting characteristic of the light adjusting layer, so that the illumination light can be uniformly projected to the center and two sides of the key. The light adjusting layer can be a single-layer light reflecting ink coating or a light shading ink coating, and can also be a double-layer coating consisting of the light reflecting ink coating and the light shading ink coating. The pattern of the light modulation layer can be round, square or any shape, and the design range of the scheme can be met as long as the light modulation layer is positioned between the light source and the key and aligned with the central area of the light source.
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Drawings
Fig. 1 is an appearance schematic diagram of a light-emitting keyboard according to an embodiment of the invention.
Fig. 2 is a sectional view of a key according to an embodiment of the present invention.
Fig. 3 is a sectional view of a key assembly according to another embodiment of the present invention.
Fig. 4 to 6 are sectional views of the key structure according to other embodiments of the present invention.
Fig. 7 and 8 are sectional views of the structure of the key according to other embodiments of the present invention.
Fig. 9 to 11 are sectional views of the structure of the key according to other embodiments of the present invention.
Fig. 12 is a schematic view of an optical path inside a key according to another embodiment of the present invention.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
Referring to fig. 1 and fig. 2, fig. 1 is an appearance schematic diagram of a light-emitting keyboard 10 according to an embodiment of the present invention, and fig. 2 is a structural cross-sectional view of a key 12 according to an embodiment of the present invention. The light-emitting keyboard 10 may include a plurality of keys 12 and a backlight module 14. The plurality of keys 12 are respectively disposed at corresponding positions of the backlight module 14, and the backlight module 14 provides light to illuminate the plurality of keys 12. The backlight module 14 may include a substrate layer 16, a light source 18, a light guide layer 20, a protection layer 22, and a dimming layer 24. Light guiding layer 20 may have a plurality of openings 26 and protective layer 22 may have a plurality of elevated regions 28. The backlight module 14 in fig. 2 only illustrates a part of the structure corresponding to a single key 12, and the number of the light sources 18, the dimming layer 24, the openings 26 and the raised areas 28 in actual operation corresponds to the number of keys 12, and is not limited to the embodiment shown in fig. 2.
The substrate layer 16 may be provided with a plurality of lines 30. When a plurality of light sources 18 are disposed on the substrate layer 16, each light source 18 is located below a corresponding key 12 and electrically connected to the wires 30. The light guide layer 20 may be located above the substrate layer 16, and the plurality of openings 26 respectively correspond to the plurality of light sources 18, so that the illumination light of each light source 18 can be projected to each key 12 through the corresponding opening 26. The light-emitting keyboard 10 may further include a bottom plate or a light shielding sheet (not shown) disposed between the keys 12 and the backlight module 14, depending on the design requirements. The protective layer 22 is disposed between the base layer 16 and the light guide layer 20. Each raised area 28 of the protective layer 22 may cover a corresponding light source 18 and be embedded in a corresponding aperture 26. The raised area 28 has opposing first and second sides 281, 282. The first side 281 faces the keys 12 and the second side 282 faces the light source 18.
The backlight module 14 is disposed below each key 12 with a set of light modulation layers 24, such as the first side 281 and/or the second side 282 of the raised area 28, for adjusting the illumination range of the illumination light of each light source 18 projected to the corresponding key 12. It should be noted that the center region of the light-adjusting layer 24 should preferably be aligned with the center region of the light source 18, so that the two opposite sides of the key 12 have uniform brightness. Each set of dimming layers 24 can be a single layer coating or a multi-layer coating, depending on design requirements. In this embodiment, the light modulating layer 24 is a light reflecting ink coating 24A, such as white or light colored ink, disposed on the first side 281 of the elevated regions 28. Referring to fig. 3, fig. 3 is a cross-sectional view of a key 12 according to another embodiment of the present invention. In this embodiment, the dimming layer 24 is also a reflective ink coating 24A, but is disposed on the second side 282 of the raised area 28. In practice, the projection of the dimming layer 24 on the substrate layer 16 may be circular, square or any shape, preferably a symmetrical shape.
Referring to fig. 4 to 6, fig. 4 to 6 are respectively structural cross-sectional views of a key 12 according to other embodiments of the present invention. In other embodiments, the light modulating layer 24 may include a light reflecting ink coating 24A and a light blocking ink coating 24B. The light-shielding ink coat 24B is a black or dark ink, and is disposed directly above the light source 18, and the area of the light-shielding ink coat 24B is smaller than that of the light-reflecting ink coat 24A. In the embodiment shown in fig. 4, the light reflecting ink coating 24A is disposed on a first side 281 of the raised areas 28 and the light blocking ink coating 24B is disposed on a second side 282. In the embodiment shown in fig. 5, both the light reflecting ink coating 24A and the light blocking ink coating 24B are disposed on a first side 281 of the raised areas 28. In the embodiment shown in fig. 6, both the reflective ink coating 24A and the light blocking ink coating 24B are disposed on the second side 282 of the raised area 28.
In addition, the dimming layer 24 may be a single light-blocking ink coating 24B. Referring to fig. 7 and 8, fig. 7 and 8 are cross-sectional structural views of a key 12 according to another embodiment of the present invention. As in the embodiment shown in fig. 7, the light blocking ink coating 24B is disposed on a first side 281 of the raised area 28, and the second side 282 is free of other coatings. In the embodiment shown in fig. 8, the light blocking ink coating 24B is disposed on the second side 282 of the raised area 28, while the first side 281 is free of other coatings. In the embodiment shown in fig. 7 and 8, the light blocking ink coating 24B may be a small area coating, such as the light blocking ink coating 24B of the embodiment shown in fig. 3-5; however, the light blocking ink coating 24B may also be a large area coating, such as the light reflecting ink coating 24A of the embodiment shown in fig. 3-5. Fig. 7 and 8 illustrate the light-shielding ink coating 24B as a large-area coating, but the practical application is not limited thereto.
Referring to fig. 9 to 11, fig. 9 to 11 are respectively structural cross-sectional views of a key 12 according to other embodiments of the present invention. In other embodiments, the light modulating layer 24 may comprise a light reflecting ink coating 24A and a light blocking ink coating 24B, but the area of the light reflecting ink coating 24A is smaller than the area of the light blocking ink coating 24B. In the embodiment shown in FIG. 9, both the reflective ink coating 24A and the opaque ink coating 24B are disposed on the second side 282 of the raised area 28, with the reflective ink coating 24A closer to the light source 18. In the embodiment shown in fig. 10, both the reflective ink coating 24A and the light blocking ink coating 24B are disposed on a first side 281 of the raised area 28, and the reflective ink coating 24A covers the light blocking ink coating 24B so that it is directly accessible to the protective layer 22. In the embodiment shown in fig. 11, the light reflecting ink coating 24A and the light blocking ink coating 24B are disposed on the second side 282 and the first side 281 of the raised areas 28, respectively.
Referring to fig. 2 and 12, fig. 12 is a schematic diagram of an optical path inside a key 12 according to another embodiment of the present invention. The dimming layer 24 of the present embodiment is not limited to a single-layer or multi-layer coating, and the dimming layer 24 is disposed on the first face 281 of the embossed region 28 as an example; the light modulation layer 24 disposed on the second side 282 should have the same or similar light path, and thus, the description thereof will not be repeated. The light source 18 emits illumination upward, and a portion of the illumination passes by the light adjusting layer 24 through the keys 12 that can be projected directly above, or is projected upward by the turning of the light guiding layer 20. Another part of the illumination light projected to the dimming layer 24 is reflected to both sides. The illumination light rays enter the light guide layer 20 after turning to the two sides of the light adjusting layer 24, and are projected upwards through the guide of the light guide layer 20; therefore, the center and both sides of each key 12 can have uniform light emitting brightness due to the function of the backlight module 14.
In order to further improve the light emitting uniformity of the key 12, as shown in fig. 12, the light adjusting layer 24 may further have a light guiding microstructure 24C, which is preferably disposed on the first surface 281 of the raised area 28. The shape, number, density, volume and position of the light guide microstructures 24C are not limited to the embodiment shown in fig. 12, and any light guide structure capable of reflecting the illumination light uniformly upward belongs to the design scope of the present disclosure.
In summary, the backlight module and the light emitting keyboard thereof of the present invention have the light modulation layer disposed on a single surface or two opposite surfaces of the protection layer corresponding to the protruding area of the light source, and the light quantity entering the light guide layer is increased by using the light reflection property of the light modulation layer, so that the illumination light can be uniformly projected to the center and two sides of the key. The light adjusting layer can be a single-layer light reflecting ink coating or a light shading ink coating, and can also be a double-layer coating consisting of the light reflecting ink coating and the light shading ink coating. The pattern of the light modulation layer can be round, square or any shape, and the design range of the scheme can be met as long as the light modulation layer is positioned between the light source and the key and aligned with the central area of the light source.
The present invention is capable of other embodiments, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention.
Claims (10)
1. A backlight module for providing light to illuminate a plurality of keys, the backlight module comprising:
the substrate layer is provided with a plurality of lines;
the plurality of light sources are arranged on the substrate layer, respectively correspond to the plurality of keys and are electrically connected with the plurality of circuits;
the light guide layer is provided with a plurality of openings and is arranged on the substrate layer, and the plurality of openings are respectively aligned with the plurality of light sources;
the protective layer is arranged between the substrate layer and the light guide layer and is provided with a plurality of raised areas, one of the raised areas is embedded into the corresponding opening hole so as to cover the corresponding light source, the raised areas are provided with a first surface and a second surface which are opposite, and the second surface faces the corresponding light source; and
each light modulation layer is arranged on at least one of the first surface and the second surface of the corresponding bump area and used for adjusting the illumination range of the corresponding light source projected to the corresponding key.
2. The backlight module of claim 1, wherein one of the dimming layers comprises a reflective ink coating disposed on the first side or the second side.
3. The backlight module of claim 2, wherein one of the dimming layers further comprises a light-blocking ink coating disposed directly above the corresponding light source, the light-blocking ink coating having an area smaller than that of the light-reflecting ink coating.
4. The backlight module of claim 1, wherein one of the dimming layers comprises a light-blocking ink coating disposed on the first side or the second side.
5. The backlight module of claim 4, wherein one of the dimming layers further comprises a reflective ink coating disposed directly above the corresponding light source, the reflective ink coating having an area smaller than an area of the light-blocking ink coating.
6. The backlight module of claim 1, wherein at least one of the light modulation layers comprises a light guide microstructure disposed on the first surface of the corresponding ridge region.
7. The backlight module of claim 1, wherein a central region of one of the dimming layers is aligned with a central region of the corresponding light source.
8. The backlight module of claim 1, wherein a projection of one of the dimming layers on the substrate layer is a symmetrical shape.
9. A light-emitting keyboard, comprising:
a plurality of keys; and
the backlight module of any one of claims 1 to 8.
10. The light-emitting keyboard of claim 1, further comprising a light-shielding sheet disposed between the plurality of keys and the backlight module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010724806.0A CN113972084A (en) | 2020-07-24 | 2020-07-24 | Backlight module and luminous keyboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010724806.0A CN113972084A (en) | 2020-07-24 | 2020-07-24 | Backlight module and luminous keyboard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113972084A true CN113972084A (en) | 2022-01-25 |
Family
ID=79585894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010724806.0A Pending CN113972084A (en) | 2020-07-24 | 2020-07-24 | Backlight module and luminous keyboard |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113972084A (en) |
-
2020
- 2020-07-24 CN CN202010724806.0A patent/CN113972084A/en active Pending
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