TWM492470U - Backlight module and light keyboard - Google Patents

Description

Backlight module and illuminated keyboard

The present invention relates to a keyboard, and more particularly to an illuminated keyboard and a backlight module therein.

The conventional illuminated keyboard is divided into two types: reflective and light absorbing. Taking the reflection type as an example, refer to the new patent case CN201364844Y, which comprises a light guide plate, a light source mounted on the light guide plate, a keyboard body mounted on the top surface of the light guide plate, and a bottom mounted on the bottom surface of the light guide plate. The first reflective sheet is mounted on the second reflective sheet on the side of the light guide plate opposite to the light source. In such a reflective type of illuminated keyboard, the second reflection sheet is mounted on the side to reduce the phenomenon of light leakage on the side surface, thereby improving the brightness.

For example, the light-emitting type is TWM435657, which includes a light guide plate, a shielding layer disposed on the top surface of the light guide plate, and a reflective sheet mounted on the bottom surface of the light guide plate, at least one of which is disposed on the guide a light-emitting element of the light panel, and a light-shielding member disposed around the periphery of the light guide plate. The shielding layer, the reflective sheet and the light shielding member define a sealed space for the light guide plate, and the light shielding plate is closed by the sealed space, thereby reducing the overall light leakage phenomenon and further improving the brightness.

In the past, the conventional illuminated keyboards mostly used the method of reducing light leakage to improve the brightness of the keyboard as a whole, but ignored the words at the corners or edges. The key has a short distance from the light source and has the disadvantage of insufficient local brightness.

Therefore, the purpose of the present invention is to provide a backlight module that leaks light from a portion of the light guide plate and enhances brightness of a specific region.

Therefore, the backlight module of the present invention comprises a light guide plate, a light-emitting unit, a light-shielding sheet, a glue layer, and a reflection sheet.

The light guide plate includes an opposite top surface and a bottom surface, and a peripheral surface connecting the top surface and the periphery of the bottom surface.

The light emitting unit is mounted on the light guide plate to provide a light source.

The light shielding sheet is disposed on the top surface of the light guide plate, and includes at least one cutting portion formed on the periphery, the cutting portion partially leaking the light guide plate.

The adhesive layer is made of a light absorbing material and surrounds the peripheral surface of the light guide plate and partially extends to the bottom surface.

The reflective sheet is connected to the bottom surface of the light guide plate by the adhesive layer.

Another object of the present invention is to provide an illuminated keyboard using the aforementioned backlight module.

Therefore, the novel illuminated keyboard comprises a backlight module as described above and a keyboard unit.

The light shielding sheet of the backlight module further includes a plurality of light transmitting regions for light to penetrate.

The keyboard unit is mounted on the light shielding sheet of the backlight module and includes a plurality of key caps. The keycaps are respectively disposed corresponding to the light transmissive area and the cut-out area, and have at least one penetration area for light to penetrate.

The effect of the novel is: by corresponding to the light shielding film When the light guide plate is weak, the cut-off area is formed, so that the light guide plate partially leaks light, thereby improving the light flux of the light of the periphery of the light guide plate, so that a specific area of the keyboard unit has a good light-emitting effect.

2‧‧‧Backlight module

21‧‧‧Light guide

211‧‧‧ top surface

212‧‧‧ bottom

213‧‧‧Week

22‧‧‧Lighting unit

221‧‧‧Lighting diode

23‧‧‧Shading film

231‧‧‧Lighting area

232‧‧‧cutout area

24‧‧‧ adhesive layer

25‧‧‧ glue layer

26‧‧‧reflector

261‧‧‧ outer periphery

3‧‧‧ keyboard unit

31‧‧‧Substrate

311‧‧‧ hollow area

32‧‧‧Key Cap

321‧‧‧ penetration zone

33‧‧‧ bracket

4‧‧‧ Shell

41‧‧‧Upper casing

42‧‧‧ Lower case

L1‧‧‧ midline

I‧‧‧Light direction

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: FIG. 1 is a perspective view showing a first embodiment of the novel illuminated keyboard. FIG. 2 is an exploded perspective view of the present invention. FIG. 3 is a partial cross-sectional view illustrating the first embodiment; FIG. 4 is a partial cross-sectional view of the cut line IV-IV of FIG. 1 illustrating a section of the light shielding sheet of the first embodiment. FIG. 5 is a bottom view showing the visor and the adhesive layer of the first embodiment, wherein the four cut-off areas of the visor are correspondingly provided with a four-key cap; 6 is a schematic view showing a second embodiment of the novel illuminated keyboard.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to FIG. 1 , FIG. 2 and FIG. 3 , the first embodiment of the novel illuminated keyboard comprises a backlight module 2 , a keyboard unit 3 , and a casing 4 .

The backlight module 2 includes a light guide plate 21 , a light emitting unit 22 , an adhesive layer 24 , a light shielding sheet 23 , a glue layer 25 , and a reflection sheet 26 .

The light guide plate 21 has an opposite top surface 211 and a bottom surface 212, and a peripheral surface 213 connecting the top surface 211 and the bottom surface 212.

The light emitting unit 22 is disposed on the light guide plate 21 for providing a light source and has at least one light emitting diode 221 (LED). In the present embodiment, the light-emitting diodes 221 are seven and are embedded in the central portion of the light guide plate 21 and are spaced apart along the vicinity of a center line L1 of the light guide plate 21.

The light shielding sheet 23 is disposed on the top surface 211 of the light guide plate 21, and has a plurality of transparent regions 231 for light to pass through, and at least one cutting portion 232 formed on the periphery. The light shielding sheet 23 can be formed by using a transparent sheet to cover the undesired light by ink printing, and then cutting off the unnecessary portion at the periphery, wherein the ink is not printed. Zone 231, and the cut-off zone 232 is where the perimeter is cut.

Referring to FIGS. 2, 4, and 5, the cut-out region 232 does not overlap the periphery of the light-shielding sheet 23 and the periphery of the light guide plate 21, so that the light guide plate 21 can partially leak light. In the present embodiment, the light shielding sheet 23 has four cut-out regions 232, which respectively cut off the four corners of the light shielding sheet 23. The reason why the corner is cut off is that the light-emitting unit 22 is embedded in the center of the light guide plate 21 in this embodiment. Therefore, the corners are farther away from the light source, resulting in lower light intensity. After the four corners of the light shielding sheet 23 are cut off, a phenomenon of partial light leakage (such as one light direction I shown in FIG. 4) can be generated in the corners of the light guide plate 21, thereby increasing the luminous flux and increasing the brightness.

It is to be noted that the configuration of the cut-off area 232 can be changed corresponding to the setting of the light-emitting unit 22, if the light-emitting unit 22 has only one light-emitting diode 221 disposed at a corner of the light guide plate 21 (ie, For spot light Source), then the truncation zone 232 will intercept the other three corners relative to the corner. If the light-emitting unit 22 has a plurality of light-emitting diodes 221 formed on one side of the light guide plate 21, the cut-off area 232 will cut off the other two corners with respect to the side of the light-emitting unit 22.

The cutting portion 232 is disposed in such a manner as to partially leak light when the light intensity of the light guide plate 21 is weak, and the light is not absorbed by the light shielding sheet 23, thereby increasing the luminous flux and increasing the brightness. Therefore, the manner in which the foregoing cut-off area 232 is configured may be arbitrarily determined, and is not limited by the disclosure of the present invention.

Referring to FIG. 2 and FIG. 5 , the adhesive layer 24 is discontinuously disposed around the periphery of the light shielding sheet 23 opposite to the light guide plate 21 , and is used for connecting the light guide plate 21 and the light shielding sheet 23 . In this embodiment, the adhesive layer 24 is made of an aqueous glue and is a light absorbing material.

Referring to FIG. 2 and FIG. 3 , the adhesive layer 25 is made of a light absorbing material and surrounds the peripheral surface 213 of the light guide plate 21 and partially extends to the bottom surface 212 . In this embodiment, the adhesive layer 25 is made of a black water-based glue.

The reflective sheet 26 is connected to the bottom surface 212 of the light guide plate 21 by the adhesive layer 25, and has an outer peripheral edge 261 extending toward the light shielding sheet 23 to cover the bottom surface 212 of the light guide plate 21 and the circumference. Face 213. In this embodiment, the adhesive layer 25 is first loaded on the outer peripheral edge 261 of the reflective sheet 26, and the reflective sheet 26 is surrounded and adhered to the light guide plate 21.

The keyboard unit 3 is mounted on the light shielding sheet 23 of the backlight module 2, and includes a substrate 31, a plurality of keycaps 32, a plurality of brackets 33, and a plurality of elastic members (not shown).

The substrate 31 is mounted on the light shielding sheet 23 and is used to carry the key caps 32, and is adjacent to the reflective sheet 26, that is, the outer peripheral edge 261 of the reflective sheet 26 extends toward the keyboard unit 3 and The adhesive layer 25 is connected to the substrate 31 of the keyboard unit 3 and covers the bottom surface 212 of the light guide plate 21 and the circumferential surface 213. The substrate 31 has a plurality of hollowed out regions 311 corresponding to the transparent regions 231 and the cut-off regions 232.

The key caps 32 are respectively disposed corresponding to the light-transmitting regions 231 by the hollow regions 311, and each of the keycaps 32 has at least one penetration region 321 through which light can pass. In this embodiment, four of the key caps 32 are respectively disposed corresponding to the cut-off area 232, and the penetration area 321 of each keycap 32 is the character to be displayed by the keycap 32 (as shown in the figure). 2 shown Enter).

The brackets 33 are respectively disposed in the key caps 32, and opposite ends of each bracket 33 are respectively pushed against the keycap 32 and the base plate 31. Each of the elastic members is disposed within each of the keycaps 32 and constantly provides a resilient biasing force to bias the keycap 32 away from the substrate 31. The structures of the brackets 33 and the elastic members are well-known and will not be described herein, and the structures thereof are not limited by the disclosure of the present invention.

Referring to FIG. 1 , FIG. 2 and FIG. 3 , the light emitted by the light-emitting unit 22 is guided by the light guide plate 21 , and the light-transmissive regions 231 of the light-shielding sheet 23 and the cut-off portions are cut off. The area 232 is ejected and diverge from the penetration regions 321 of the keycaps 32 through the hollowed out regions 311 of the substrate 31, thereby causing the keyboard unit 3 to produce an illuminating effect.

The outer casing 4 has an upper casing 41 and a lower casing 42. The upper housing 41 is provided for the key caps 32 and is matched with the lower housing 42 The backlight module 2 and the keyboard unit 3 are disposed. Although the housing 4 is illustrated in the figure as a desktop keyboard product, the present invention is not limited thereto, and the present invention can also be implemented in a casing (not shown) of a notebook computer.

Through the above description, the advantages of the new model can be summarized as follows:

1. The cut-off region 232 is formed on the light-shielding sheet 23 corresponding to the weak light of the light guide plate 21, so that the light guide plate 21 partially leaks light, and the light is not absorbed by the light-shielding sheet 23, thereby improving the light guide plate 21. The luminous flux at the weaker peripheral light makes the specific area of the keyboard unit 3 have a good luminous effect, such as the word keys such as Esc and Ctrl which are commonly used by the user.

2. The reflective sheet 26 can reflect light back to the light guide plate 21 to improve light utilization efficiency, and the colloid 25 located on the side of the light guide plate 21 can absorb linear light to avoid side leakage.

3. The adhesive layer 24 can adopt a material that absorbs light, and can absorb the refracted light at the edge of the light guide plate 21, so that the overall illumination of the keyboard unit 3 is more uniform.

Referring to FIG. 6, the second embodiment of the present illuminated keyboard is substantially the same as the first embodiment except that the cut-out area 232 of the light-shielding sheet 23 is such that the periphery of the light-shielding sheet 23 is notched.

The cut-out region 232 can be arbitrarily formed on the periphery of the light shielding sheet 23, and therefore, the cut-out region 232 can be formed under the specific key cap 32 adjacent to the periphery of the substrate 31, thereby enhancing the brightness of the key cap 32, so that the use The keycap 32 can be found more accurately. For example, the cut-off area 232 is formed under the Shift key, or the cut-off area 232 is formed under the direction keys (not shown) and the F1 key to the F12 key (not shown).

As such, the second embodiment not only performs the functions of the foregoing first embodiment, but also provides another configuration of the cutting area 232, whereby the brightness of the specific keycap 32 can be improved, and the convenience of recognition can be improved.

As described above, by forming the cut-off region 232 on the light-shielding sheet 23, the light guide plate 21 is partially leaked, and the light flux of the light guide plate 21 is increased, thereby improving the light-emitting effect of the specific region. Can achieve the purpose of this new type.

However, the above is only the embodiment of the present invention, and the scope of the present invention cannot be limited thereto, that is, the simple equivalent changes and modifications made by the scope of the patent application and the contents of the patent specification are still It is within the scope of this new patent.

2‧‧‧Backlight module

21‧‧‧Light guide

211‧‧‧ top surface

213‧‧‧Week

22‧‧‧Lighting unit

221‧‧‧Lighting diode

23‧‧‧Shading film

231‧‧‧Lighting area

232‧‧‧cutout area

25‧‧‧ glue layer

26‧‧‧reflector

261‧‧‧ outer periphery

3‧‧‧ keyboard unit

32‧‧‧Key Cap

321‧‧‧ penetration zone

4‧‧‧ Shell

41‧‧‧Upper casing

42‧‧‧ Lower case

L1‧‧‧ midline

Claims (10)

A backlight module includes: a light guide plate including an opposite top surface and a bottom surface, and a peripheral surface connecting the top surface and the periphery of the bottom surface; an illumination unit mounted on the light guide plate for providing a light source a light shielding sheet is disposed on the top surface of the light guide plate, and includes at least one cut-out area formed on the periphery, the cut-off area causes a portion of the light guide plate to leak light; a glue layer is made of a light-absorbing material and is surrounded by The peripheral surface of the light guide plate extends partially to the bottom surface; and a reflective sheet is connected to the bottom surface of the light guide plate by the adhesive layer. The backlight module of claim 1, wherein the cut-off area removes at least one corner of the light shielding sheet. The backlight module of claim 2, wherein the light emitting unit is embedded on a side of the light guide plate opposite to the cut-off area, and includes at least one light-emitting diode. The backlight module of claim 1, wherein the light shielding sheet comprises four cut-off regions, and the four corners of the light shielding sheet are respectively cut off. The backlight module of claim 4, wherein the light emitting unit is embedded in a central portion of the light guide plate and includes at least one light emitting diode. The backlight module of claim 1, wherein the adhesive layer is made of a black water-based glue. The backlight module of claim 1, further comprising an adhesive layer connecting the light guide plate and the light shielding sheet, the adhesive layer discontinuously surrounding a circumference of the light shielding sheet opposite to the light guide plate. The backlight module of claim 7, wherein the adhesive layer is made of a light absorbing material. An illuminated keyboard, comprising: the backlight module of claim 1, wherein the light shielding film further comprises a plurality of transparent areas for light to penetrate; and a keyboard unit mounted on the backlight module And a plurality of keycaps respectively disposed corresponding to the light transmitting region and the cutting region, and having at least one penetrating region for light to penetrate. The illuminating keyboard of claim 9, wherein the keyboard unit further comprises a substrate for carrying the key caps, the reflective sheet covering the bottom surface and the circumferential surface of the light guide plate, and the outer peripheral edge The keyboard unit extends and is connected to the base of the keyboard unit.