CN114077008B - Backlight module - Google Patents
Backlight module Download PDFInfo
- Publication number
- CN114077008B CN114077008B CN202010812146.1A CN202010812146A CN114077008B CN 114077008 B CN114077008 B CN 114077008B CN 202010812146 A CN202010812146 A CN 202010812146A CN 114077008 B CN114077008 B CN 114077008B
- Authority
- CN
- China
- Prior art keywords
- light
- reflecting surface
- accommodating part
- light guide
- guide plate
- 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.)
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Links
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 5
- 239000004417 polycarbonate Substances 0.000 claims description 5
- 229920000515 polycarbonate Polymers 0.000 claims description 5
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0065—Manufacturing aspects; Material aspects
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0055—Reflecting element, sheet or layer
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention discloses a backlight module, which comprises a light guide plate and a light emitting module. The light guide plate comprises a first side, a second side, at least one accommodating part and at least one light guide structure. The accommodating part is adjacent to the first side and is provided with an incidence surface facing the second side. The light guide structure is arranged between the accommodating part and the second side and comprises a first reflecting surface and a second reflecting surface. The first reflecting surface faces the first side and is close to the accommodating part. The second reflecting surface is arranged adjacent to the first reflecting surface, faces the first side and is far away from the accommodating part. The light-emitting module comprises at least one light-emitting unit, and the light-emitting unit is accommodated in the accommodating part.
Description
Technical Field
The present invention relates to a backlight module, and more particularly to a backlight module applied to a light-emitting keyboard.
Background
The rapid development of electronic technology and information industry now makes various electronic devices move toward light, thin, short, small and functional diversity. Such as computers, notebook computers, tablet computers, smart phones, etc., have become an indispensable electronic device for the daily life or work of modern people. In most cases, users use input devices such as a mouse and a keyboard to operate electronic devices, and use of a keyboard is common.
In order to clearly see the symbol on each key in the environment with insufficient light, a technician introduces a light source technology into the keyboard, and a backlight module is arranged at the bottom of the keyboard module. Generally, a backlight module includes a light emitting module, a light guide plate, and other components. The light-emitting module is provided with a plurality of light-emitting units, and the light guide plate is correspondingly provided with a containing part. The light-emitting unit is arranged in the accommodating part, so that the light emitted by the light-emitting unit can be guided to the bottom of the whole keyboard by the light guide plate and projected to each key. Light is transmitted out of the key surface or the periphery of the key, so that a user can clearly see the character symbols on the key cap.
Because the cost of the light-emitting module is high, the light-emitting units are often arranged on one side of the light guide plate in a concentrated manner, and the light-emitting direction of the light-emitting units faces to other sides, so that the effects of saving cost and uniformly distributing light are achieved. However, such an arrangement (design) has a disadvantage in that the back surface (i.e., the opposite side to the light emitting direction) of the light emitting unit becomes a dark area, and an improvement is necessary.
Disclosure of Invention
In view of the above problems, the present invention is to provide a backlight module, which solves the problem that the back area of the light emitting unit is always a dark area when the conventional backlight module is applied to the light emitting keyboard by the novel design of the light guiding structure of the light guiding plate.
In order to achieve the above objective, the present invention provides a backlight module, which includes a light guide plate and a light emitting module. The light guide plate comprises a first side, a second side, at least one accommodating part and at least one light guide structure. The accommodating part is adjacent to the first side and is provided with an incidence surface facing the second side. The light guide structure is arranged between the accommodating part and the second side and comprises a first reflecting surface and a second reflecting surface. The first reflecting surface faces the first side and is close to the accommodating part. The second reflecting surface is arranged adjacent to the first reflecting surface, faces the first side and is far away from the accommodating part. The light-emitting module comprises at least one light-emitting unit, and the light-emitting unit is accommodated in the accommodating part. The light emitted by the light emitting unit enters the light guide plate from the incident surface and is transmitted towards the second side, and part of the light is guided to the second reflecting surface by the first reflecting surface and then guided to the first side by the second reflecting surface.
According to an embodiment of the invention, the light guiding structure comprises an opening, or a groove.
According to an embodiment of the present invention, a predetermined angle is formed between the first reflecting surface and the second reflecting surface, and the predetermined angle is greater than or equal to two times of the critical angle of total reflection.
According to an embodiment of the present invention, the first reflecting surface and the second reflecting surface are two planes connected to each other.
According to an embodiment of the present invention, the extending direction of the first reflecting surface and the extending direction of the second reflecting surface form a predetermined angle, and the predetermined angle is greater than or equal to two times of the critical angle of total reflection.
According to an embodiment of the present invention, the first reflecting surface and the second reflecting surface are two unconnected planes.
According to an embodiment of the present invention, the light guide is made of polycarbonate or polymethyl methacrylate, and the predetermined angle is greater than or equal to 84 degrees.
According to an embodiment of the invention, the predetermined angle is less than 180 degrees.
According to an embodiment of the present invention, the first reflecting surface and the second reflecting surface together form a cambered surface that is connected or disconnected.
According to an embodiment of the invention, the arc of the arc surface is less than 180 degrees.
In the above, the light guide plate of the light emitting keyboard according to the present invention includes a light guide structure. The light guide structure is provided with a first reflecting surface and a second reflecting surface which face the light emitting unit (are positioned in the accommodating part). The second reflecting surface is arranged adjacent to the first reflecting surface, the first reflecting surface is close to the accommodating part, and the second reflecting surface is far away from the accommodating part. After the light emitted by the light-emitting unit enters the light guide plate from the incident surface of the accommodating part, part of the light can be guided to the second reflecting surface by the first reflecting surface and then guided to the first side by the second reflecting surface, so that the effect of eliminating a dark area on the back side of the light-emitting unit is achieved.
Drawings
FIG. 1 is an exploded view of a backlight module applied to a light-emitting keyboard according to an embodiment of the present invention;
FIG. 2 is a schematic top view of the keyboard module and the backlight module shown in FIG. 1 after assembly;
FIG. 3A is an enlarged schematic view of one of the light guiding structures shown in FIG. 2;
FIG. 3B is a schematic diagram illustrating a path of light emitted from the light emitting unit shown in FIG. 3A;
FIG. 4A is an enlarged schematic view of another light guiding structure shown in FIG. 2;
FIG. 4B is a schematic diagram illustrating a path of light emitted from the light emitting unit shown in FIG. 4A;
fig. 5 is an enlarged schematic view of a further light guiding structure shown in fig. 2.
[ symbolic description ]
Luminous keyboard 1
Keyboard module 10
Key 11
Backlight module 2
Light guide plate 20
First side 21
Second side 22
The accommodating portion 23
Incidence plane 231
Light guiding structures 24, 24a, 24b
First reflecting surfaces 241, 241a, 241b
Second reflecting surfaces 242, 242a, 242b
Light emitting module 30
Light emitting unit 31
Predetermined angle theta
Incidence angle a i 、b i
Detailed Description
In order to make the technical content of the present invention more clear, the following description is given by way of specific preferred embodiments.
Fig. 1 is an exploded view of a backlight module applied to a light-emitting keyboard according to an embodiment of the invention, fig. 2 is a schematic top view of the keyboard module shown in fig. 1 and the backlight module after assembly, and the keyboard module of fig. 2 is shown by a dotted line. Referring to fig. 1 and 2, in the present embodiment, the light-emitting keyboard 1 includes a keyboard module 10 and a backlight module 2, and the backlight module 2 is disposed below the keyboard module 10. Specifically, the keyboard module 10 includes a plurality of keys 11, and the backlight module 2 is located on a side opposite to the keys 11 (as shown in fig. 1). The backlight module 2 of the present embodiment includes a light guide plate 20 and a light emitting module 30. The light emitting module 30 includes at least one light emitting unit 31, and the embodiment is described as the light emitting module 30 having a plurality of light emitting units 31.
In the present embodiment, the light guide plate 20 includes a first side 21 and a second side 22 opposite to each other, at least one accommodating portion 23 and at least one light guide structure 24. The first side 21 and the second side 22 may be two long sides or two short sides of the light guide plate 20, and this embodiment is exemplified by two long sides of the light guide plate 20. The first side 21 of the present embodiment is a long side near the space key of the keyboard module 10, and the second side 22 is a long side near the function key. The accommodating portion 23 is configured to accommodate the light emitting units 31, and the accommodating portion 23 in the embodiment is a through hole structure disposed on the light guide plate 20, but the invention is not limited thereto, and may also be a groove structure to accommodate the light emitting units 31 in the through holes or the grooves, so the positions and the number of the accommodating portions 23 may be configured corresponding to the light emitting units 31. The accommodating portion 23 of the present embodiment is adjacent to the first side 21, such that the light emitting unit 31 is also adjacent to the first side 21. The accommodating portion 23 has an incident surface 231, and the incident surface 231 faces the second side 22. Specifically, the incident surface 231 is a surface where light enters the light guide plate 20. When the light emitting unit 31 is mounted to the accommodating portion 23, the light emitting direction of the light emitting unit 31 may be directed toward the incident surface 231, so that the light emitted by the light emitting unit 31 may enter the light guide plate 20 from the incident surface 231 and be transmitted toward the second side 22.
The light guide plate 20 of the present embodiment includes three different light guide structures 24, 24a, 24b, and the light guide structure 24 is first described as an example. The light guiding structure 24 is disposed between the accommodating portion 23 and the second side 22. The light guide structure 24 is disposed between the accommodating portion 23 and the second side 22 with reference to the short axis direction. Fig. 3A is an enlarged schematic view of one of the light guiding structures 24 shown in fig. 2, and fig. 3B is a schematic view of a path of light emitted from the light emitting unit shown in fig. 3A, please refer to fig. 2, fig. 3A and fig. 3B. The light guiding structure 24 includes a first reflecting surface 241 and a second reflecting surface 242, and the first reflecting surface 241 and the second reflecting surface 242 are the side surfaces of the first side 21 facing the light guiding structure 24. The first reflecting surface 241 is close to the accommodating portion 23, so that the light entering the light guide plate 20 from the incident surface 231 can be transmitted to the first reflecting surface 241 (i.e. contact with the first reflecting surface 241). Preferably, a portion of the first reflecting surface 241 corresponds to the incident surface 231, that is, the first reflecting surface 241 and the area of the incident surface 231 projected to the first side 21 overlap each other, so as to ensure that a portion of the light entering the light guide plate 20 from the incident surface 231 can be transmitted to the first reflecting surface 241.
The second reflecting surface 242 is disposed adjacent to the first reflecting surface 241, and the second reflecting surface 242 is disposed at an end of the first reflecting surface 241 away from the accommodating portion 23, so as to receive the light reflected from the first reflecting surface 241. In short, the light emitted from the light emitting unit 31 may enter the light guide plate 20 from the incident surface 231, and part of the light is transmitted to the first reflecting surface 241 and guided to the second reflecting surface 242 by the first reflecting surface 241. Then, due to the first side 21 facing the second reflecting surface 242, the light can be guided to the first side 21 by the second reflecting surface 242 again, so as to eliminate the dark area on the back side of the light emitting unit 31.
In detail, the light guiding structure 24 of the present embodiment may include, for example, but not limited to, an opening, or a groove, so that the light guiding plate 20 has an optically dense medium (the light guiding plate 20 itself) and an optically sparse medium (air in the opening, or the groove). Therefore, when light is transmitted to the light guiding structure 24 (light-guiding medium) through the light guiding plate 20 (light-tight medium), refraction and total reflection occur at the interface between the two mediums (i.e. the first reflecting surface 241 and the second reflecting surface 242) due to different angles of the incident light. The material of the light guide plate 20 of the present embodiment may be, for example, but not limited to, polycarbonate (PC) or polymethyl methacrylate (poly (methyl methacrylate), PMMA). In this example, polycarbonate (PC) is taken as an example, and the refractive index thereof is 1.52. In general, the critical angle for total reflection transmitted from the polycarbonate light guide plate 20 (optically dense medium) to the light guide structure 24 (optically sparse medium) is 42 degrees. In other words, total reflection occurs when the incident angle is 42 degrees or more. Thus, the light rays have an incident angle a i The light having a degree of 42 or more is transmitted to the first reflection surface 241, and is transmitted in the direction of the second reflection surface 242 by the first total reflection. Then, the light is also incident at angle b i The light having a degree of 42 or more is transmitted to the second reflection surface 242, and is transmitted in the direction of the first side 21 by the second total reflection. In other words, the present embodiment greatly changes the light path by making the light undergo secondary total reflection.
In this embodiment, the light guiding structure 24 is an L-shaped opening, so that the first reflecting surface 241 and the second reflecting surface 242 are two planes connected to each other. The first reflecting surface 241 and the second reflecting surface 242 are disposed at a predetermined angle θ therebetween. Taking the generation of secondary total reflection as an example, a predetermined angleThe angle θ is equal to the incident angle a of the light beam on the first reflecting surface 241 i B of incidence angle with the second reflective surface 242 i Sum (θ=a) i +b i ). Due to the incident angle a i 、b i All that is required is that the total reflection critical angle (42 degrees) is equal to or greater than the total reflection critical angle, so the predetermined angle θ in this embodiment can be defined as equal to or greater than two times the total reflection critical angle. The critical angle of total reflection between the light guide plate 20 and the light guide structure 24 in this embodiment is exemplified by 42 degrees, so the predetermined angle θ is greater than 84 degrees. Preferably, the predetermined angle θ is also less than 180 degrees.
The light reflected from the first reflecting surface 241 can have an incident angle b due to the limitation of a predetermined angle θ between the first reflecting surface 241 and the second reflecting surface 242 i An angle of 42 degrees or greater is transmitted to the second reflective surface 242 to generate a second total reflection and direct the light to the first side 21 of the light guide plate 20. Since the first side 21 is located at the back side of the light emitting unit 31, the first reflection surface 241 and the second reflection surface 242 of the light guiding structure 24 can generate total reflection twice, so as to greatly change the light path direction and guide the light to the first side 21, and further eliminate the dark area located at the back side of the light emitting unit 31, as shown in fig. 3B.
Fig. 4A is an enlarged schematic view of another light guiding structure 24A shown in fig. 2, and fig. 4B is a schematic view of a path of light emitted from the light emitting unit shown in fig. 4A, please refer to fig. 2, fig. 4A and fig. 4B. In this embodiment, the light guiding structure 24a is formed by two openings (slits) arranged in an L shape, so that the first reflecting surface 241a and the second reflecting surface 242a form two unconnected planes. Similarly, there is a limitation of an included angle between the first reflecting surface 241a and the second reflecting surface 242 a. The extending direction of the first reflecting surface 241a and the second reflecting surface 242a in this embodiment forms a predetermined angle θ. Similarly, the predetermined angle θ is equal to or greater than a double total reflection critical angle, that is, the predetermined angle θ is equal to or greater than 84 degrees. Preferably, the predetermined angle θ is also less than 180 degrees.
After entering the light guide plate 20 from the incident surface 231, the light enters the light guide plate at an incident angle a i When the light is transmitted to the first reflection surface 241a at an angle of 42 degrees or more, the light is transmitted to the second reflection surface 242a after the first total reflection. A first reflecting surfaceLight reflected by 241a at an incident angle b i The angle greater than or equal to 42 degrees is transmitted to the second reflecting surface 242a to generate the second total reflection and guide the light to the first side 21 of the light guide plate 20, so as to achieve the effect of eliminating the dark area on the back side of the light emitting unit 31, as shown in fig. 4B.
Fig. 5 is an enlarged schematic view of the light guiding structure 24b shown in fig. 2, please refer to fig. 2 and 5 simultaneously. The light guiding structure 24b of the present embodiment is an arc-shaped opening, so that the first reflecting surface 241b and the second reflecting surface 242b together form a continuous arc surface. Preferably, the arc of the arc surface is less than 180 degrees. Since the circular arc shape can be considered as a myriad of planes, the effect of guiding the light to the first side 21 by generating secondary total reflection can be achieved. In other embodiments, the light guiding structure 24b may also have two arc-shaped openings, so that the first reflecting surface 241b and the second reflecting surface 242b together form a non-connected arc surface, which can also achieve the effect of generating secondary total reflection of light.
Specifically, the light enters the light guide plate 20 from the incident surface 231 and is transmitted to the first reflection surface 241b adjacent to the accommodating portion 23. If the incident angle a i At least 42 degrees, the first total reflection is generated and transmitted to the second reflection surface 242 b. Similarly, if the incident angle b i At least 42 degrees, a second total reflection is generated to guide the light to the first side 21 of the light guide plate 20, so as to eliminate the dark area on the back side of the light emitting unit 31.
In summary, the light guide plate of the light emitting keyboard according to the present invention includes a light guide structure. The light guide structure is provided with a first reflecting surface and a second reflecting surface which face the light emitting unit (are positioned in the accommodating part). The second reflecting surface is arranged adjacent to the first reflecting surface, the first reflecting surface is close to the accommodating part, and the second reflecting surface is far away from the accommodating part. After the light emitted by the light-emitting unit enters the light guide plate from the incident surface of the accommodating part, part of the light can be guided to the second reflecting surface by the first reflecting surface and then guided to the first side by the second reflecting surface, so that the effect of eliminating a dark area on the back side of the light-emitting unit is achieved.
It should be noted that the above-mentioned embodiments are presented for the purpose of illustration and that the scope of the invention claimed should be defined by the claims rather than by the above-mentioned embodiments.
Claims (6)
1. A backlight module, comprising:
a light guide plate includes:
a first side and a second side opposite to the first side;
at least one accommodating part adjacent to the first side, wherein the accommodating part is provided with an incident surface facing the second side; and
At least one light guiding structure is arranged between the accommodating part and the second side, and the light guiding structure comprises:
a first reflecting surface facing the first side and close to the accommodating part; and
The second reflecting surface is arranged adjacent to the first reflecting surface, faces the first side and is far away from the accommodating part; and
the light-emitting module comprises at least one light-emitting unit, the light-emitting unit is accommodated in the accommodating part, light rays emitted by the light-emitting unit enter the light guide plate from the incident surface and are transmitted towards the second side, and part of the light rays are guided to the second reflecting surface by the first reflecting surface and then guided to the first side by the second reflecting surface;
a preset angle is clamped between the first reflecting surface and the second reflecting surface, and the preset angle is more than or equal to two times of total reflection critical angle.
2. The backlight module according to claim 1, wherein the first reflecting surface and the second reflecting surface are two planes connected to each other.
3. A backlight module, comprising:
a light guide plate includes:
a first side and a second side opposite to the first side;
at least one accommodating part adjacent to the first side, wherein the accommodating part is provided with an incident surface facing the second side; and
At least one light guiding structure is arranged between the accommodating part and the second side, and the light guiding structure comprises:
a first reflecting surface facing the first side and close to the accommodating part; and
The second reflecting surface is arranged adjacent to the first reflecting surface, faces the first side and is far away from the accommodating part; and
the light-emitting module comprises at least one light-emitting unit, the light-emitting unit is accommodated in the accommodating part, light rays emitted by the light-emitting unit enter the light guide plate from the incident surface and are transmitted towards the second side, and part of the light rays are guided to the second reflecting surface by the first reflecting surface and then guided to the first side by the second reflecting surface;
the first reflecting surface and the second reflecting surface are arranged in the extending direction of the first reflecting surface and the second reflecting surface to form a preset angle, and the preset angle is larger than or equal to a double total reflection critical angle.
4. A backlight module according to claim 3, wherein the first reflecting surface and the second reflecting surface are two unconnected planes.
5. A backlight module according to claim 1 or 3, wherein the light guide plate is made of polycarbonate or polymethyl methacrylate, and the predetermined angle is greater than or equal to 84 degrees.
6. The backlight module according to claim 5, wherein the predetermined angle is less than 180 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010812146.1A CN114077008B (en) | 2020-08-13 | 2020-08-13 | Backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010812146.1A CN114077008B (en) | 2020-08-13 | 2020-08-13 | Backlight module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114077008A CN114077008A (en) | 2022-02-22 |
| CN114077008B true CN114077008B (en) | 2024-04-09 |
Family
ID=80280604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010812146.1A Active CN114077008B (en) | 2020-08-13 | 2020-08-13 | Backlight module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114077008B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202815259U (en) * | 2012-10-15 | 2013-03-20 | 京东方科技集团股份有限公司 | Light guide plate, backlight module and display device |
| CN104091713A (en) * | 2014-03-18 | 2014-10-08 | 苏州达方电子有限公司 | Backlight device and light-emitting keyboard |
| CN206563816U (en) * | 2017-03-06 | 2017-10-17 | 苏州茂立光电科技有限公司 | Backlight module and its light guide plate |
| TWM555059U (en) * | 2017-10-13 | 2018-02-01 | 茂林光電科技股份有限公司 | Backlight module and backlit keyboard |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9903999B2 (en) * | 2015-02-11 | 2018-02-27 | Tyco Electronics Canada Ulc | Light assembly for illuminating an emblem |
-
2020
- 2020-08-13 CN CN202010812146.1A patent/CN114077008B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202815259U (en) * | 2012-10-15 | 2013-03-20 | 京东方科技集团股份有限公司 | Light guide plate, backlight module and display device |
| CN104091713A (en) * | 2014-03-18 | 2014-10-08 | 苏州达方电子有限公司 | Backlight device and light-emitting keyboard |
| CN206563816U (en) * | 2017-03-06 | 2017-10-17 | 苏州茂立光电科技有限公司 | Backlight module and its light guide plate |
| TWM555059U (en) * | 2017-10-13 | 2018-02-01 | 茂林光電科技股份有限公司 | Backlight module and backlit keyboard |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114077008A (en) | 2022-02-22 |
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