CN111584283A - Keyboard backlight module - Google Patents
Keyboard backlight module Download PDFInfo
- Publication number
- CN111584283A CN111584283A CN201910168970.5A CN201910168970A CN111584283A CN 111584283 A CN111584283 A CN 111584283A CN 201910168970 A CN201910168970 A CN 201910168970A CN 111584283 A CN111584283 A CN 111584283A
- Authority
- CN
- China
- Prior art keywords
- light
- metal plate
- backlight module
- reflective
- opening
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910052751 metal Inorganic materials 0.000 claims abstract description 69
- 239000002184 metal Substances 0.000 claims abstract description 69
- 229910052782 aluminium Inorganic materials 0.000 claims description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 239000003292 glue Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 18
- 238000002310 reflectometry Methods 0.000 abstract description 7
- 230000005855 radiation Effects 0.000 description 7
- 230000017525 heat dissipation Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000005240 physical vapour deposition Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000000565 sealant Substances 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
Images
Classifications
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2219/00—Legends
- H01H2219/054—Optical elements
- H01H2219/06—Reflector
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2219/00—Legends
- H01H2219/054—Optical elements
- H01H2219/062—Light conductor
Abstract
The invention discloses a keyboard backlight module, which comprises a shading sheet, a light guide plate, a metal plate and a light-emitting element. The light shielding sheet is provided with a lower surface. The light guide plate is provided with a first opening and a light-emitting surface, and the light-emitting surface is arranged on the lower surface of the shading sheet. The metal plate has a second opening and a reflective surface. The first opening and the second opening are correspondingly arranged to form a through hole. The reflection surface is arranged facing the light guide plate and provided with a plurality of reflection structures. The light-emitting element is arranged in the through hole. The metal plate can be directly used as a reflecting plate, and the effect of thinning can be achieved. The reflecting surface has a plurality of reflecting structures, and the reflectivity of the reflecting surface can be improved by the reflecting structures so as to provide enough brightness. Meanwhile, the conductive characteristic of the metal plate can be utilized to achieve the protection effect of electrostatic discharge.
Description
Technical Field
The invention relates to a backlight module of a keyboard.
Background
The rapid development of electronic technology and information industry has led to the development of various electronic devices with light, thin, short, small and powerful functions. Such as computers, notebook computers, tablet computers, smart phones, etc., have become indispensable electronic devices for modern people in daily life or work. In most cases, users operate electronic devices by using input devices such as a mouse and a keyboard, and the keyboard is most convenient.
In order to clearly see the symbol on each key in an environment with insufficient light, technicians introduce light source technology into the keyboard to develop a light-emitting keyboard with a backlight module. The light emitting keyboard in the market at present is that the bottom of the key module is provided with a backlight module, and the backlight module comprises a light guide plate, a reflecting plate, a light emitting element and other structures. The light-emitting element is arranged on the light guide plate, so that light can be guided to the bottom of the whole keyboard through the light guide plate and can be projected to the back of the keycap of each key. The light can be transmitted out from the key surface or the periphery of the key, so that the user can clearly see the character symbols on the keycap.
The main function of the reflector is to reflect light back to the light guide plate. The material of the reflective plate is generally a white plastic plate, such as polyethylene terephthalate (PET), which has no conductive effect. Therefore, a metal plate is added to the bottom of the backlight module of a part of the light-emitting keyboard, or the metal plate is directly used for replacing the reflecting plate, so as to prevent the keyboard from being damaged due to electrostatic discharge (ESD). However, the additional arrangement of a metal plate increases the thickness of the backlight module, which is not favorable for the thin design of the light-emitting keyboard. The metal plate is directly used to replace the reflecting plate, so that the reflecting effect is poor, the luminous effect of the luminous keyboard is poor, the brightness is low, and the improvement is necessary.
Disclosure of Invention
In view of the foregoing, it is a primary objective of the present invention to provide a keyboard backlight module, which includes a metal plate having a reflective surface, and the reflective surface has a plurality of reflective structures, so as to solve the problem that the conventional keyboard backlight module cannot be thinned and provide sufficient brightness at the same time in order to avoid the damage of electrostatic discharge.
To achieve the above object, the present invention provides a keyboard backlight module, which includes a light shielding sheet, a light guide plate, a metal plate and a light emitting device. The light shielding sheet is provided with a lower surface. The light guide plate is provided with a first opening and a light-emitting surface, and the light-emitting surface is arranged on the lower surface of the shading sheet. The metal plate has a second opening and a reflective surface. The first opening and the second opening are correspondingly arranged to form a through hole. The reflection surface is arranged facing the light guide plate and provided with a plurality of reflection structures. The light-emitting element is arranged in the through hole.
According to an embodiment of the present invention, the reflective surface is an aluminum layer, and the reflective structures are disposed on the aluminum layer.
According to an embodiment of the present invention, the material of the metal plate includes aluminum, copper, or a combination thereof.
According to an embodiment of the present invention, the reflective structures are respectively a strip-shaped microstructure.
According to an embodiment of the present invention, the reflective structures are arranged in parallel on the reflective surface.
According to an embodiment of the present invention, the reflective structures are parallel to one sidewall of the second opening.
According to an embodiment of the present invention, a surface of the metal plate opposite to the reflective surface includes a conductive region and a non-conductive region.
According to an embodiment of the present invention, a surface portion of the metal plate opposite to the reflective surface is coated with a non-conductive layer to form a non-conductive region, and the region not coated with the non-conductive layer is a conductive region.
According to an embodiment of the invention, the non-conductive layer has a high thermal conductivity.
According to an embodiment of the present invention, a sealant is disposed around the lower surface of the light-shielding sheet, and the metal plate and the light-shielding sheet are connected by the sealant.
In summary, the keyboard backlight module according to the present invention includes a light shielding sheet, a light guide plate and a metal plate. The light guide plate is arranged on the lower surface of the shading sheet, and the reflecting surface of the metal plate faces the light guide plate. The reflecting surface of the metal plate can reflect the light to the light guide plate and then be utilized by total reflection, so that the metal plate can be directly used as a reflecting plate, and the effect of thinning can be achieved. Moreover, the reflecting surface is provided with a plurality of reflecting structures, and the reflectivity of the reflecting surface can be improved by the reflecting structures so as to provide enough brightness. Meanwhile, the conductive characteristic of the metal plate can be utilized to achieve the protection effect of electrostatic discharge.
In addition, the bottom surface of the metal plate can be coated with a non-conductive layer to form a non-conductive area, and the non-conductive area is a conductive area. In addition to the aforementioned electrostatic discharge protection effect achieved by the conductive region, the heat radiation (e.g., the heat radiation emitted by the circuit board) inside the keyboard backlight module can be absorbed by the non-conductive region and conducted to the metal plate, so as to achieve the heat dissipation effect.
Drawings
Fig. 1 is an exploded view of a keyboard backlight module according to an embodiment of the invention.
Fig. 2 is a partial sectional view of the keyboard backlight module shown in fig. 1 after being assembled.
Fig. 3 is a partially enlarged view of the light emitting device shown in fig. 1 accommodated in the second opening of the metal plate.
Fig. 4 is a schematic bottom view of the metal plate shown in fig. 1.
Wherein the reference numerals are:
keyboard backlight module 1 shading sheet 10
The light emitting surface 22 of the first opening 21
Second opening 31 of metal plate 30
Non-conductive region 34 light emitting element 40
Region A
Detailed Description
In order to make the technical content of the present invention more comprehensible, preferred embodiments are described below.
Fig. 1 is an exploded view of a keyboard backlight module according to an embodiment of the invention, and fig. 2 is a partial sectional view of the keyboard backlight module shown in fig. 1 after being assembled, please refer to fig. 1 and fig. 2 at the same time. In the present embodiment, the keyboard backlight module 1 includes a light shielding sheet 10, a light guide plate 20, a metal plate 30 and a light emitting device 40. In the view of fig. 1 and 2, the light shielding sheet 10, the light guide plate 20, and the metal plate 30 are sequentially disposed from top to bottom.
Specifically, the light shielding sheet 10 has a lower surface 11 and an upper surface 12, and the upper surface 12 faces the bottom of the key module (not shown). The light shielding sheet 10 includes a plurality of light emitting parts 13, which respectively correspond to the keys (not shown) of the key module. In the embodiment, the light guide plate 20 has a first opening 21 and a light emitting surface 22, and the light emitting surface 22 is disposed on the lower surface 11 of the light shielding sheet 10. The metal plate 30 has a second opening 31 and a reflective surface 32. The metal plate 30 is located on a side of the light guide plate 20 opposite to the light exit surface 22, and the reflection surface 32 is disposed facing the light guide plate 20. Preferably, a glue 50 may be disposed on the periphery of the lower surface 11 of the light shielding sheet 10, such that the metal plate 30 and the light shielding sheet 10 are connected by the glue 50, and the light guide plate 20 is located between the metal plate 30 and the light shielding sheet 10. The reflective surface 32 of the metal plate 30 is provided with a plurality of reflective structures 321.
When the metal plate 30 is disposed on a side of the light guide plate 20 opposite to the light exit surface 22, the first opening 21 and the second opening 31 are disposed correspondingly to form a through hole, and the light emitting element 40 can be disposed in the through hole. In the embodiment, the light emitting element 40 is disposed on the circuit board 41, the circuit board 41 is disposed on the bottom surface of the metal plate 30, and the light emitting element 40 passes through the second opening 31 of the metal plate 30 and is accommodated in the through hole formed by the first opening 21 and the second opening 31. The light emitted from the light emitting device 40 enters the light guide plate 20 from the sidewall of the first opening 21 and is guided to the whole light guide plate 20. Part of the light is emitted toward the light shielding sheet 10 through the light-emitting surface 22, and is emitted to the key cap of the key through the light-emitting part 13 of the light shielding sheet 10, thereby achieving the effect of light emission of the key.
If the light in the light guide plate 20 is emitted downward to the metal plate 30, or the light emitted from the light emitting device 40 is emitted into the metal plate 30 through the second opening 31, the light can be reflected to the light guide plate 20 by the reflective surface 32 of the metal plate 30 and then utilized by the light guide plate 20. Therefore, the metal plate 30 can be used as a reflective plate, and the reflective structure 321 can further improve the reflective effect of the reflective surface 32.
In the present embodiment, the material of the metal plate 30 may be aluminum, copper, or a combination thereof. Preferably, the reflective surface 32 is an aluminum layer, and the reflective structure 321 is disposed on the aluminum layer. For example, the metal plate 30 may be an aluminum plate, and the surface (aluminum) of the metal plate 30 may be directly used as the reflective surface 32. Alternatively, the metal plate 30 may be a copper plate, and a layer of aluminum may be plated on the surface of the copper plate to serve as the reflection surface 32. In the present embodiment, a textured surface (texture surface) is formed on the reflection surface 32, as shown in fig. 2, and the microstructure constituting the textured surface is the reflection structure 321.
Preferably, the reflective structures 321 can be stripe microstructures and are arranged in parallel on the reflective surface 32. For example, the reflection surface 32 may be formed by Physical Vapor Deposition (PVD) to form a hairline surface, as shown in fig. 1, and each hairline (stripe-shaped microstructure) is the reflection structure 321 of this embodiment. The reflectivity of a general white Plastic (PET) reflector plate can reach about 88% under a 450nm wave band. After the aluminum layer (the reflective surface 32) forms the surface of the hairline (the reflective structure 321), the reflectivity of the metal plate 30 can be increased to 88%.
Fig. 3 is an enlarged view of a portion of the light emitting device shown in fig. 1 accommodated in the second opening of the metal plate, that is, an enlarged view of the area a shown in fig. 1, please refer to fig. 3. Preferably, the reflective structure 321 of the present embodiment is parallel to one sidewall 311 of the second opening 31, so that the reflective structure 321 and a main path (as indicated by an arrow mark in fig. 3) of the light emitted from the light emitting device 40 can be perpendicular to each other or parallel to each other. In fig. 3, the reflecting structure 321 and the sidewall 311 are parallel to each other, so that the reflecting structure 321 is perpendicular to the main path of the light, and the light can be more effectively emitted toward the light guide plate 20 by the structure, so as to improve the reflectivity of the metal plate 30. In other embodiments, the reflective structure 321 may be parallel to the sidewall 312 (i.e., the reflective structure 321 may be perpendicular to the sidewall 311), so that the reflective structure 321 is parallel to the main path of the light, which may also improve the reflectivity of the metal plate 30.
The circuit board 41 is disposed on the bottom surface of the metal plate 30, and further utilizes the conductive property of the metal plate 30 to achieve the effect of protecting against electrostatic discharge (ESD). Fig. 4 is a schematic bottom view of the metal plate shown in fig. 1, please refer to fig. 4. Preferably, a surface of the metal plate 30 opposite to the reflective surface 32, i.e. a bottom surface of the metal plate 30, has a conductive region 33 and a non-conductive region 34. The conductive region 33 is connected to the ground element to protect against electrostatic discharge, thereby preventing the keyboard backlight module 1 or the entire light-emitting keyboard from being damaged by electrostatic discharge.
The non-conductive region 34 of the present embodiment is used for heat dissipation. A non-conductive layer, such as ink, may be applied to the bottom portion of the metal plate 30. Specifically, a non-conductive layer may be coated on the non-conductive region 33 by ink printing according to the configuration of the conductive region 33 to form the non-conductive region 34. The area not coated with the non-conductive layer (ink) is the bottom surface of the metal plate 30 to serve as the conductive area 33. Preferably, the non-conductive layer may be black ink, which has high thermal conductivity and can be used for absorbing heat to absorb heat radiation inside the keyboard backlight module 1, such as heat radiation emitted from the circuit board 41. The heat radiation is then conducted to the metal plate 30 and assisted by the metal plate 30 to achieve the heat dissipation effect. Preferably, the thickness of the metal plate 30 can be 0.02 mm to 0.1 mm, so as to achieve a better heat dissipation effect.
In summary, the keyboard backlight module according to the present invention includes a light shielding sheet, a light guide plate and a metal plate. The light guide plate is arranged on the lower surface of the shading sheet, and the reflecting surface of the metal plate faces the light guide plate. The reflecting surface of the metal plate can reflect the light to the light guide plate and then be utilized by total reflection, so that the metal plate can be directly used as a reflecting plate, and the effect of thinning can be achieved. Moreover, the reflecting surface is provided with a plurality of reflecting structures, and the reflectivity of the reflecting surface can be improved by the reflecting structures so as to provide enough brightness. Meanwhile, the conductive characteristic of the metal plate can be utilized to achieve the protection effect of electrostatic discharge.
In addition, the bottom surface of the metal plate can be coated with a non-conductive layer to form a non-conductive area, and the non-conductive area is a conductive area. In addition to the aforementioned electrostatic discharge protection effect achieved by the conductive region, the heat radiation (e.g., the heat radiation emitted by the circuit board) inside the keyboard backlight module can be absorbed by the non-conductive region and conducted to the metal plate, so as to achieve the heat dissipation effect.
Claims (10)
1. A keyboard backlight module, comprising:
a light shielding sheet having a lower surface;
a light guide plate having a first opening and a light emergent surface disposed on the lower surface of the light shielding sheet;
a metal plate having a second opening and a reflective surface, wherein the first opening and the second opening are correspondingly arranged to form a through hole, the reflective surface is arranged towards the light guide plate, and the reflective surface is provided with a plurality of reflective structures; and
a light emitting element disposed in the through hole.
2. The keyboard backlight module of claim 1, wherein the reflective surface is an aluminum layer, and the reflective structures are disposed on the aluminum layer.
3. The backlight module of claim 1, wherein the metal plate comprises aluminum, copper, or a combination thereof.
4. The keyboard backlight module of claim 1, wherein the reflective structures are respectively a stripe-shaped microstructure.
5. The keyboard backlight module of claim 4, wherein the reflective structures are arranged parallel to each other on the reflective surface.
6. The keyboard backlight module of claim 5, wherein the reflective structures are parallel to one of the sidewalls of the second opening.
7. The keyboard backlight module of claim 1, wherein a surface of the metal plate opposite to the reflective surface comprises a conductive region and a non-conductive region.
8. The keyboard backlight module of claim 7, wherein a non-conductive layer is coated on the surface portion of the metal plate opposite to the reflective surface to form the non-conductive region, and the region not coated with the non-conductive layer is the conductive region.
9. The keyboard backlight module of claim 8, wherein the non-conductive layer has a high thermal conductivity.
10. The keyboard backlight module of claim 1, wherein a glue is disposed around the lower surface of the light-shielding sheet, and the metal plate is connected to the light-shielding sheet via the glue.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW108105163A TWI668392B (en) | 2019-02-15 | 2019-02-15 | Keyboard backlight module |
| TW108105163 | 2019-02-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111584283A true CN111584283A (en) | 2020-08-25 |
| CN111584283B CN111584283B (en) | 2022-09-30 |
Family
ID=68316535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910168970.5A Active CN111584283B (en) | 2019-02-15 | 2019-03-06 | Keyboard backlight module |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111584283B (en) |
| TW (1) | TWI668392B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI688978B (en) | 2019-09-20 | 2020-03-21 | 群光電能科技股份有限公司 | Illuminating keyboard |
| TWI742907B (en) * | 2020-11-03 | 2021-10-11 | 達方電子股份有限公司 | Backlight apparatus used in illuminated keyboard |
| US11852861B2 (en) | 2021-01-29 | 2023-12-26 | Darfon Electronics Corp. | Luminous keyboard and optical module thereof |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101126859A (en) * | 2006-08-17 | 2008-02-20 | 胜华科技股份有限公司 | Backlight module and light guiding board employed by same |
| CN101221265A (en) * | 2007-01-12 | 2008-07-16 | 财团法人工业技术研究院 | Light guiding plate |
| CN201146131Y (en) * | 2008-01-22 | 2008-11-05 | 闳晖实业股份有限公司 | Thin type key-press module with reflection structure |
| CN101975360A (en) * | 2010-10-12 | 2011-02-16 | 苏州茂立光电科技有限公司 | Backlight module and liquid crystal display device |
| CN201780913U (en) * | 2010-03-31 | 2011-03-30 | 苏州达方电子有限公司 | Luminous keyboard |
| CN202076170U (en) * | 2011-05-15 | 2011-12-14 | 苏州达方电子有限公司 | Light-emitting keyboard |
| TW201326977A (en) * | 2011-12-20 | 2013-07-01 | Global Lighting Technologies | Lighting emitting apparatus and manufacturing method thereof |
| CN103354188A (en) * | 2013-06-04 | 2013-10-16 | 苏州达方电子有限公司 | Illuminant keyboard and light guide plate module thereof and manufacture method of light guide plate module |
| CN104091713A (en) * | 2014-03-18 | 2014-10-08 | 苏州达方电子有限公司 | Backlight device and light-emitting keyboard |
| CN204408808U (en) * | 2015-01-14 | 2015-06-17 | 陈锦裕 | Portable type communication device dividing plate |
| CN107402475A (en) * | 2016-05-20 | 2017-11-28 | 恒颢科技股份有限公司 | Direct type backlight module |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5427639B2 (en) * | 2010-02-17 | 2014-02-26 | 日本メクトロン株式会社 | Switch module |
| TWI501278B (en) * | 2014-03-06 | 2015-09-21 | Darfon Electronics Corp | Backlight apparatus and illuminated keyboard including such backlight apparatus |
-
2019
- 2019-02-15 TW TW108105163A patent/TWI668392B/en active
- 2019-03-06 CN CN201910168970.5A patent/CN111584283B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101126859A (en) * | 2006-08-17 | 2008-02-20 | 胜华科技股份有限公司 | Backlight module and light guiding board employed by same |
| CN101221265A (en) * | 2007-01-12 | 2008-07-16 | 财团法人工业技术研究院 | Light guiding plate |
| CN201146131Y (en) * | 2008-01-22 | 2008-11-05 | 闳晖实业股份有限公司 | Thin type key-press module with reflection structure |
| CN201780913U (en) * | 2010-03-31 | 2011-03-30 | 苏州达方电子有限公司 | Luminous keyboard |
| CN101975360A (en) * | 2010-10-12 | 2011-02-16 | 苏州茂立光电科技有限公司 | Backlight module and liquid crystal display device |
| CN202076170U (en) * | 2011-05-15 | 2011-12-14 | 苏州达方电子有限公司 | Light-emitting keyboard |
| TW201326977A (en) * | 2011-12-20 | 2013-07-01 | Global Lighting Technologies | Lighting emitting apparatus and manufacturing method thereof |
| CN103354188A (en) * | 2013-06-04 | 2013-10-16 | 苏州达方电子有限公司 | Illuminant keyboard and light guide plate module thereof and manufacture method of light guide plate module |
| CN104091713A (en) * | 2014-03-18 | 2014-10-08 | 苏州达方电子有限公司 | Backlight device and light-emitting keyboard |
| CN204408808U (en) * | 2015-01-14 | 2015-06-17 | 陈锦裕 | Portable type communication device dividing plate |
| CN107402475A (en) * | 2016-05-20 | 2017-11-28 | 恒颢科技股份有限公司 | Direct type backlight module |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI668392B (en) | 2019-08-11 |
| CN111584283B (en) | 2022-09-30 |
| TW202032060A (en) | 2020-09-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7651231B2 (en) | Lighting module for use in a keypad device | |
| US9442238B2 (en) | Backlight module | |
| CN111584283B (en) | Keyboard backlight module | |
| US8888305B2 (en) | Illuminated keyboard | |
| US8714850B2 (en) | Backlight module and lighting keyboard | |
| US9040856B2 (en) | Luminous keyboard device | |
| US11764008B2 (en) | Circuit structure, backlight module and light-emitting key device using the same | |
| TWI677000B (en) | Backlight module | |
| US9018554B2 (en) | Luminescent keyswitch module and keyboard thereof | |
| US8586887B2 (en) | Membrane circuit board and luminous keyboard using same | |
| JP2010092738A (en) | Light guide sheet, wiring module, and electronic equipment | |
| TW201712379A (en) | Backlight module | |
| US11287898B2 (en) | Backlight module and illuminated keyboard | |
| US10915615B2 (en) | Sensing device and terminal device | |
| US20210149102A1 (en) | Light emitting keyboard | |
| JP2010015794A (en) | Light guide sheet switch unit | |
| TW201501159A (en) | Luminous keyboard device | |
| US20160097896A1 (en) | Light emitting structure around a keyboard backlight module | |
| US10593492B1 (en) | Illuminating keyboard and light emitting module thereof | |
| CN212810153U (en) | Luminous key structure | |
| JP2010034008A (en) | Light guide sheet switch unit | |
| US20210119077A1 (en) | Reflective display | |
| TWM548882U (en) | Keyboard | |
| CN209747387U (en) | Light guide structure of backlight device | |
| US11703629B1 (en) | Light guide structure, manufacturing method and backlight module with light guide structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |