CN215869077U - Backlight device with double-layer light guide plate - Google Patents
Backlight device with double-layer light guide plate Download PDFInfo
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- CN215869077U CN215869077U CN202121736578.5U CN202121736578U CN215869077U CN 215869077 U CN215869077 U CN 215869077U CN 202121736578 U CN202121736578 U CN 202121736578U CN 215869077 U CN215869077 U CN 215869077U
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Abstract
The utility model discloses a backlight device with double-layer light guide plate, which is applied to a keyboard, the keyboard comprises a bottom plate and a keycap, the backlight device comprises: the light screen, double-deck light guide plate and luminescence unit, the light screen is equipped with out the light area, the edge portion of double-deck light guide plate is equipped with fretwork portion, double-deck light guide plate is equipped with the light reflex portion, the light reflex portion is corresponding with the position of key cap, can be with regions such as the directive key cap that light is more concentrated, form concentrated luminous effect, improve the utilization ratio of light, in the space of fretwork portion is located to luminescence unit's light source, double-deck light guide plate can form two way propagation routes, improve leaded light efficiency, improve the luminance and the degree of consistency in light-emitting zone.
Description
Technical Field
The present invention relates to a backlight device, and more particularly, to a backlight device having a double-layered light guide plate.
Background
A keyboard is a common input device that may be used in a variety of environments, such as in low light situations, where a lighted keyboard is used. In a conventional light-emitting keyboard, a backlight device is disposed below a bottom plate of the keyboard to provide a light source for the light-emitting keyboard.
The light shading plate is arranged below the keyboard bottom plate, the light guide plate is arranged below the light shading plate, the reflecting plate is arranged below the light guide plate, light rays of the light emitting unit can be totally reflected in the light guide plate and emitted to the keycap of the keyboard, and therefore the effect of light emitting of the keycap is achieved.
The design and manufacture of light guide plates have significant impact on the backlight industry, especially on brightness and uniformity, while the light guide plates of the prior art have low light guide efficiency and poor brightness and uniformity.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a backlight device with double-layer light guide plates, which is provided with the double-layer light guide plates, can improve light guide efficiency and brightness and uniformity, and solves the problem that the brightness and uniformity of a light emitting area are low due to low light guide efficiency of the backlight device.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a backlight device with double-layer light guide plates is applied to a keyboard, the keyboard comprises a bottom plate and keycaps, and the backlight device comprises:
the light screen is arranged below the bottom plate and provided with a light emergent area;
the double-layer light guide plate is arranged below the shading plate, a hollow part is arranged at the edge part of the double-layer light guide plate, and a light reflecting part is arranged on the double-layer light guide plate and corresponds to the position of the keycap;
and the light-emitting unit is arranged on one side of the double-layer light guide plate and comprises a light source, and the light source is arranged in the space of the hollow part.
Therefore, the double-layer light guide plate can form two paths of transmission lines, the light guide efficiency is improved, and the brightness and the uniformity of a light emitting area are improved.
The light reflection part of the light guide plate can reflect light, and the light is concentrated to regions such as keycaps to form a concentrated light emitting effect, so that the utilization rate of the light is improved.
In some embodiments, the light reflecting portion is provided with a reflection point.
Therefore, the light reflecting part is provided with a plurality of uniformly distributed reflecting points so as to reflect light more intensively.
In some embodiments, the double-layer light guide plate includes a first light guide plate and a second light guide plate, and a light reflection portion is disposed on a lower surface of the first light guide plate.
Therefore, the first light guide plate and the second light guide plate form the double-layer light guide plate structure.
In some embodiments, the backlight device further includes a reflection plate disposed under the double-layered light guide plate.
Therefore, the reflecting plate can reflect the light rays leaving the double-layer light guide plate back to the double-layer light guide plate so as to improve the utilization rate of the light rays.
In some embodiments, the light emitting unit further includes a circuit board disposed below the reflection plate, and the light source is connected above the circuit board.
In some embodiments, the edge portion of the reflection plate is bonded to the edge portion of the light shielding plate.
From this, the edge part of reflecting plate is glued with the edge part of light screen to carry on spacingly to the double-deck light guide plate between reflecting plate and the light screen, with prevent or reduce double-deck light guide plate horizontal migration, improve the equipment precision.
In some embodiments, the shading plate is further provided with a shading area, and the shading area is provided with a black printing tape or black ink.
From this, the light screen forms out light zone and shading district through setting up seal black sticky tape and black printing ink, and the shading district can shelter from light, goes out the light zone and can be with regional such as light directive key cap.
In some embodiments, the light emitting unit further includes a circuit board disposed above the double-layered light guide plate, and the light source is connected below the circuit board.
Therefore, the circuit board is arranged above the double-layer light guide plate, so that the circuit board does not protrude downwards from the reflecting plate, and the structure is more compact.
In some embodiments, the visor is provided with a through hole, which is capable of receiving the circuit board. Therefore, the through hole can accommodate the circuit board, and the structure is more compact.
The utility model has the beneficial effects that: the double-layer light guide plate can form two paths of transmission lines, improves light guide efficiency, improves brightness and uniformity of a light emitting area, can form a centralized light emitting effect, and can meet optical quality requirements more easily.
Drawings
FIG. 1 is an exploded view of a backlight device having a double-layered light guide plate according to the present invention;
FIG. 2 is a cross-sectional view of a backlight device having a double-layered light guide plate according to the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2;
FIG. 4 is a cross-sectional view of a backlight device having a double-layered light guide plate according to the present invention;
wherein: 20-a keyboard; 201-a backplane; 202-a key cap; 10-a backlight device; 1-a visor; 11-a through hole; 2-double-layer light guide plate; 21-a hollowed-out portion; 22-a light reflecting part; 2 a-a first light guide plate; 2 b-a second light guide plate; 3-a light-emitting unit; 31-a light source; 32-a circuit board; 4-reflecting plate.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1 to 4, a backlight device 10 with a double-layered light guide plate is applied to a keyboard 20, the keyboard 20 includes a bottom plate 201 and a key cap 202, the backlight device 10 includes:
the light shading plate 1 is arranged below the bottom plate 201, and the light shading plate 1 is provided with a light emergent area;
the double-layer light guide plate 2 is arranged below the shading plate 1, a hollow part 21 is arranged at the edge part of the double-layer light guide plate 2, a light reflecting part 22 is arranged on the double-layer light guide plate 2, and the light reflecting part 22 corresponds to the position of the keycap 202;
and a light emitting unit 3 disposed at one side of the double-layered light guide plate 2, wherein the light emitting unit 3 includes a light source 31, and the light source 31 is disposed in the space of the hollow portion 21.
Double-deck light guide plate 2 is transparent material, can be with the light guide light screen 1's of light source 31 light-emitting area, then the directive keyboard needs luminous region, double-deck light guide plate 2's fretwork portion 21 is used for placing light source 31, make light source 31 inlay the dress in fretwork portion 21's space, light that light source 31 sent forms two routes of transmission route through double-deck light guide plate 2's direction, through light reflex portion 22 directive light screen 1, thereby improve leaded light efficiency, and then improve luminance and degree of consistency, and under the prerequisite of the luminance of certain standard and degree of consistency, can reduce light source 31's power or data, do benefit to the saving cost.
The light reflecting part 22 of the light guide plate can reflect light rays, so that the light rays are emitted to areas such as the keycap 202 in a concentrated manner, a concentrated light emitting effect is formed, and the utilization rate of the light rays is improved.
Further, the light source 31 is an LED.
Further, the light reflecting portion 22 is provided with a reflecting point. The light reflecting portion 22 has a plurality of reflective dots uniformly distributed to reflect light more intensively.
To explain, the double-layered light guide plate 2 includes a first light guide plate 2a and a second light guide plate 2b, and a light reflection portion 22 is disposed on a lower surface of the first light guide plate 2 a. The first light guide plate 2a and the second light guide plate 2b constitute the double-layer light guide plate 2 structure.
Further, the edge portions of the first light guide plate 2a and the second light guide plate 2b are respectively provided with a corresponding hollow portion 21.
Further, the backlight device 10 further includes a reflective plate 4, and the reflective plate 4 is disposed below the double-layered light guide plate 2. The reflecting plate 4 can reflect the light leaving the double-layer light guide plate back into the double-layer light guide plate, so that the utilization rate of the light is improved.
To explain, referring to fig. 2, the light emitting unit 3 further includes a circuit board 32, the circuit board 32 is disposed below the reflection plate 4, and the light source 31 is connected above the circuit board 32.
Further, the edge of the reflective plate 4 is provided with a hollow structure, so that the light source 31 can enter the hollow part 21 of the double-layer light guide plate 2.
Further, the edge portion of the reflection plate 4 is bonded to the edge portion of the light shielding plate 1.
The edge part of the reflecting plate 4 is adhered to the edge part of the light shielding plate 1, so that the double-layer light guide plate 2 between the reflecting plate 4 and the light shielding plate 1 is limited, the horizontal movement of the double-layer light guide plate 2 is prevented or reduced, and the assembly precision is improved.
Further, the shading plate 1 is further provided with a shading area, and the shading area is provided with a black printing tape or black printing ink.
The shading plate 1 forms a light emitting area and a shading area through setting a black printing adhesive tape and black printing ink, the shading area can shade light, and the light emitting area can emit the light to areas such as the keycap 202.
To explain, referring to fig. 4, the light emitting unit 3 further includes a circuit board 32, the circuit board 32 is disposed above the double-layered light guide plate 2, and the light source 31 is connected below the circuit board 32.
The circuit board 32 is disposed above the double-layer light guide plate 2, so that the circuit board 32 does not protrude downward from the reflector 4, and the structure is more compact.
To explain this, the light shielding plate 1 is provided with a through hole 11, and the through hole 11 can accommodate the circuit board 32. The through hole 11 can accommodate the circuit board 32, and the structure becomes more compact.
The foregoing disclosure discloses only some embodiments of the utility model. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept herein, and it is intended to cover all such modifications and variations as fall within the scope of the utility model.
Claims (9)
1. A backlight device with double-layer light guide plate is characterized in that the backlight device is applied to a keyboard (20), the keyboard (20) comprises a bottom plate (201) and a keycap (202), and the backlight device (10) comprises:
the light shielding plate (1) is arranged below the bottom plate (201), and the light shielding plate (1) is provided with a light emergent area;
the double-layer light guide plate (2) is arranged below the shading plate (1), a hollow-out part (21) is arranged at the edge part of the double-layer light guide plate (2), a light reflection part (22) is arranged on the double-layer light guide plate (2), and the light reflection part (22) corresponds to the keycap (202); and
the light emitting unit (3) is arranged on one side of the double-layer light guide plate (2), the light emitting unit (3) comprises a light source (31), and the light source (31) is arranged in the space of the hollow-out portion (21).
2. The backlight device with the double-layered light guide plate according to claim 1, wherein the light reflecting portion (22) is provided with reflective dots.
3. The backlight device with the double-layered light guide plate according to claim 2, wherein the double-layered light guide plate (2) comprises a first light guide plate (2a) and a second light guide plate (2b), and the light reflection part (22) is provided on a lower surface of the first light guide plate (2 a).
4. The backlight device with the double-layered light guide plate according to claim 1, wherein the backlight device (10) further comprises a reflective plate (4), and the reflective plate (4) is disposed below the double-layered light guide plate (2).
5. The backlight device with the double-layered light guide plate according to claim 4, wherein the light emitting unit (3) further comprises a circuit board (32), the circuit board (32) is disposed below the reflection plate (4), and the light source (31) is connected above the circuit board (32).
6. The backlight device with the double-layered light guide plate according to claim 4, wherein an edge portion of the reflection plate (4) is bonded to an edge portion of the light-shielding plate (1).
7. The backlight device with double-layered light guide plate according to claim 1, wherein the light-shielding plate (1) is further provided with a light-shielding region provided with a black tape or black ink.
8. The backlight device with the double-layered light guide plate according to claim 1, wherein the light emitting unit (3) further comprises a circuit board (32), the circuit board (32) is disposed above the double-layered light guide plate (2), and the light source (31) is connected below the circuit board (32).
9. The backlight device with the double-layered light guide plate according to claim 8, wherein the light-shielding plate (1) is provided with a through hole (11), and the through hole (11) can accommodate the circuit board (32).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121736578.5U CN215869077U (en) | 2021-07-28 | 2021-07-28 | Backlight device with double-layer light guide plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121736578.5U CN215869077U (en) | 2021-07-28 | 2021-07-28 | Backlight device with double-layer light guide plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215869077U true CN215869077U (en) | 2022-02-18 |
Family
ID=80328279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121736578.5U Active CN215869077U (en) | 2021-07-28 | 2021-07-28 | Backlight device with double-layer light guide plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215869077U (en) |
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2021
- 2021-07-28 CN CN202121736578.5U patent/CN215869077U/en active Active
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