TWM539144U - Backlight device and luminescent keyboard - Google Patents

Description

Backlight device and illuminated keyboard

The present invention relates to a backlight device, and more particularly to a backlight device related to an illuminated keyboard.

The keyboard is an input device for controlling the operation of the computer. In order to use the keyboard in a dim environment, a keyboard is developed.

Generally, the illumination source of the illuminated keyboard is a backlight module, which is disposed under the button, and the light of the backlight module is guided to the key cap to make the button emit light. The structure of the backlight module mainly includes a light shielding layer, a light guide plate and a reflective layer from top to bottom. The light of a light source is transmitted through the light guide plate to conduct total reflection therein. When the light is transmitted to a specific processing (for example, a dot structure) of the light guide plate, the total reflection condition is destroyed and the square is broken. Scattering, the upward light can be projected onto the button to cause it to illuminate, and the downward light is reflected back into the light guide plate via the auxiliary of the reflective layer, so that the light of the light source can be fully utilized.

However, a certain proportion of the light reflected back to the light guide plate is stray light reflected and scattered through the reflective layer or the structural layer below the light guide plate, and is returned through the side slit of the key cap after returning, causing light leakage on the side of the key cap, so that the key cap The contrast between the upper character and the symbol is reduced, which in turn affects the character and symbol recognition on the keycap. In view of this, the conventional backlight module has an improvement.

Therefore, the present invention provides a backlight device and an illuminated keyboard to prevent the downward diffused light from being reflected and scattered back to the light guide plate, thereby improving the light leakage at the side of the keycap to increase the brightness contrast of characters and symbols on the key cap.

The present invention provides a backlight device for an illuminated keyboard in order to solve the problems of the prior art. The invention comprises: a light guide plate, wherein a top surface is a light emitting surface; a light emitting unit is disposed corresponding to one light incident surface of the light guide plate to provide light to the light guide plate; and a light absorbing layer is disposed on the light guide plate Lower, facing the bottom surface of the light guide plate, and absorbing light emitted from the bottom surface of the light guide plate.

In an embodiment of the present invention, a backlight device for an illuminated keyboard is provided. The light guide plate is formed with a through portion penetrating up and down. The light incident surface is formed on one side wall of the through portion, and the light emitting unit is disposed on the light emitting unit. In the penetration.

In an embodiment of the present invention, a backlight device for an illuminated keyboard is further provided, further comprising a light shielding layer disposed to cover a top surface of the light guide plate, and forming a light shielding region on a predetermined partial portion of a top surface of the light guide plate And a light-transmissive region is formed in a portion other than the partial portion, so that light emitted from the light-emitting surface of the light guide plate is transmitted through the light-transmitting region.

In an embodiment of the present invention, a backlight device for an illuminated keyboard is further provided, further comprising a plurality of separate reflecting portions, and wherein a surface of the light guiding plate is provided with a dot structure, and the plurality of reflecting portions are disposed on the light absorbing layer The surface and the bottom surface of the light guide plate face the plurality of light-transmissive regions, and are disposed corresponding to the dot structure for reflecting light emitted from the bottom surface of the light guide plate.

In an embodiment of the present invention, a backlight device for an illuminated keyboard is further provided, further comprising a reflecting portion, and wherein a surface of the light guiding plate is provided with a dot structure, the reflecting portion is disposed on a lower surface of the light absorbing layer and facing the through surface In the light region, the light absorbing layer has a penetrating portion penetrating up and down corresponding to the plurality of light transmitting regions and the dot structure, and the reflecting portion reflects the light emitted from the bottom surface of the light guide plate through the penetrating portion.

In an embodiment of the present invention, a backlight device for an illuminated keyboard is provided, and the dot structure is disposed on a light emitting surface of the light guide plate or a bottom surface of the light guide plate.

In an embodiment of the present invention, a backlight device for an illuminated keyboard is provided. The dot structure is disposed on a light emitting surface of the light guide plate and a bottom surface of the light guide plate.

In an embodiment of the present invention, a backlight device for an illuminated keyboard is provided. The light absorbing layer extends beyond a bottom surface of the light guide plate and covers a side surface of the light guide plate for absorbing light emitted from a side surface of the light guide plate.

In an embodiment of the present invention, a backlight device for an illuminated keyboard is provided. The light absorbing layer includes an adhesive layer, and the adhesive layer is adhered to a bottom surface of the light guide plate.

In an embodiment of the present invention, a backlight device for an illuminated keyboard is provided. The light absorbing layer includes an adhesive layer adhered to a bottom surface and a side surface of the light guide plate for adhering to a bottom surface of a keyboard substrate.

In an embodiment of the present invention, a backlight device for an illuminated keyboard is provided. The light absorbing layer includes an adhesive layer adhered to a bottom surface, a side surface and a peripheral surface of the upper surface of the light guide plate for a bottom surface of a keyboard substrate. Paste.

In an embodiment of the present invention, a backlight device for an illuminated keyboard is provided, and the adhesive layer is a plurality of adhesive portions.

In an embodiment of the present invention, a backlight device for an illuminated keyboard is provided, the adhesive layer being located on the entire surface of the light absorbing layer facing the light guide plate.

Another technical means for solving the problems of the prior art is to provide an illuminated keyboard comprising: the backlight device as described above; and a button device disposed above the backlight device and having at least one key cap The keycap has a light transmitting portion, wherein the light transmitting portion is configured to transmit light emitted from the light guide plate of the backlight device through the light transmitting portion of the keycap.

Through the technical means adopted by the present invention, the absorbing layer can absorb the light that is emitted from the light guide plate, avoiding the stray light reflected and scattered through the reflective layer or the structural layer under the light guide plate, and returning through the side slit of the keycap after returning. , causing light leakage on the side of the keycap. In turn, the brightness contrast and recognition of the characters and symbols of the illuminated keyboard are increased.

In addition, the reflecting portion disposed at a specific position near the absorbing layer can reflect the light at a specific position back to the light guide plate, and the light is further transmitted to the upper button device to make the button emit light, thereby truly achieving the effect of the light source being properly utilized.

Preferably, the reflecting portion is adjusted to be disposed above or below the absorbing layer according to the arrangement relationship of the respective components of the backlight module.

Embodiments of the present creation will be described below based on Figs. 1 to 3 . This description is not intended to limit the implementation of the present invention, but is one of the embodiments of the present invention.

As shown in FIG. 1 , an illuminated keyboard 100 according to a first embodiment of the present invention includes a backlight device 1 and a button device 2 disposed above the backlight device 1 .

In detail, the backlight device 1 includes a light guide plate 11 , a light emitting unit 12 , a light absorbing layer 13 , a light shielding layer 14 , and a reflection portion 15 .

In this embodiment, the light guide plate 11 has a top surface 111, a bottom surface 112, and a through portion penetrating vertically. The top surface 111 is a light exiting surface, and the through portion has two left and right opposite side walls 1131, 1131', and the two side walls 1131, 1131' are a light incident surface. The bottom surface 112 of the light guide plate 11 is provided with a dot structure 115. In other embodiments, the dot structure 115 can be disposed on the top surface 111 of the light guide plate 11 or on the top surface 111 and the bottom surface 112.

The light emitting unit 12 is disposed in the through portion and corresponds to the two side walls 1131 and 1131' of the through portion to provide the light guide plate 11 with the light 121. The light-emitting diode 12 can be a light-emitting diode, and the light 121 emitted from the light-emitting surface enters the light guide plate 11 from the light-incident surface, and is continuously reflected in the light guide plate 11 and is destroyed when the total reflection condition is destroyed. The light exiting surface leaves the light guide plate 11.

The light absorbing layer 13 is disposed below the light guide plate 11 and faces the bottom surface of the light guide plate 11 . In the embodiment, the light absorbing layer is a black sheet to absorb the light 121 emitted from the bottom surface 112 of the light guide plate 11.

The light shielding layer 14 is disposed to cover the top surface 111 of the light guide plate 11, and a light shielding region 141 is formed at a predetermined partial portion of the top surface 111 of the light guide plate 11, and a light transmitting region is formed in a portion other than the partial portion. 142, the light ray 121 emitted from the light-emitting surface of the light guide plate 11 is permeable through the light-transmitting region 142.

A plurality of the separated reflecting portions 15 are disposed between the upper surface of the light absorbing layer 13 and the bottom surface 112 of the light guiding plate 11 to face the light transmitting region 142, and are disposed corresponding to the dot structure 115 for reflecting from the The light ray 121 emitted from the bottom surface 112 of the light guide plate 11. Specifically, the reflection portion 15 is formed by, for example, applying white paint to the light absorbing layer 13 and sticking a white sheet. The reflecting portion 15 has a plurality of reflecting dots, and the reflecting dots are disposed at a position opposite to the dot structure of the bottom surface 112 of the light guide plate 11 to efficiently reflect the light 121 emitted from the bottom surface 112 of the light guide plate 11. A plurality of the reflection portions 15 are disposed directly below the halftone dot structure 115, and the size and shape are approximately equal to the area of the halftone dot structure 115. Preferably, the plurality of the reflective portions 15 are approximately smaller in size and shape than the dot structure 115. .

The adhesive layer 132 of the light absorbing layer 13 is located on the surface of the light absorbing layer 13 facing the light guide plate 11 to adhere the light absorbing layer 13 to the bottom surface of the light guide plate 11.

The button device 2 has at least one keycap 21, a substrate 22 and a connecting member 23 disposed between the keycap 21 and the substrate 22 to connect the keycap 21 to the substrate 22. The keycap 21 has a light transmitting portion 211 formed corresponding to the light transmitting region 142 of the light shielding layer 14. In addition, the substrate 22 is also formed with a light transmitting portion 221 corresponding to the light transmitting region 142 of the light shielding layer 14.

The position of the light-transmitting region 142 of the light-shielding layer 14 , the light-transmitting portion 221 of the substrate 22 and the light-transmitting portion 211 of the key cap 21 are correspondingly disposed on a vertical surface, so that the backlight is provided. The light ray 121 emitted from the light guide plate 11 of the device 1 can be transparently transmitted through the light transmitting region 142, the light transmitting portion 221 of the substrate 22, and the light transmitting portion of the key cap 21.

Optionally, an illuminated keyboard 100a according to a second embodiment shown in FIG. 2 is substantially the same as the structure of the illuminated keyboard 100, except that the light guide plate 11 may not have the through portion formed thereon. An illuminating unit 12a is disposed on a side of the light guide plate 11 and opposite to the side wall 114 of the light guide plate 11. The side wall 114 is a light incident surface. The light ray 121a emitted by the light emitting unit 12a enters the side wall 114. In the light guide plate 11. The adhesive layer 132 is a plurality of separate adhesive portions on a surface of the light absorbing layer 13 facing the light guide plate 11.

Optionally, an illuminated keyboard 100b according to a third embodiment shown in FIG. 3 is substantially the same as the structure of the illuminated keyboard 100a, and a light emitting unit 12b is also disposed on the side of the light guide plate 11. The reflection portion 15b is disposed on the lower surface of the light absorption layer 13 and faces the light transmission region 142, and the light absorption layer 13 has a through portion 131 penetrating up and down corresponding to the light transmission region 142 and the dot structure. The reflection portion 15b reflects the light emitted from the bottom surface 112 of the light guide plate 11 via the penetration portion 131. A plurality of the through portions 131 are disposed directly below the halftone dot structure 115, and the size and shape are approximately equal to the area of the halftone dot structure 115. Preferably, the plurality of through portions 131 are approximately smaller in size and shape than the dot dot structure 115. . In addition, the light absorbing layer 13 extends beyond the bottom surface 112 of the light guide plate 11 to cover the side surface of the light guide plate 11 to absorb light leakage from the side surface of the light guide plate 11. The adhesive layer 132 is disposed on the entire surface of the light absorbing layer 13 facing the light guide plate 11 , and is adhered to the bottom surface 112 of the light guide plate 11 , the side surface and the periphery of the top surface 111 , and adhered to the bottom surface of the substrate 22 of the button device 2 .

The above description and description are only illustrative of the preferred embodiments of the present invention, and those having ordinary skill in the art may make other modifications in accordance with the scope of the patent application as defined below and the above description, but such modifications are still It is the creative spirit of this creation and is within the scope of this creation.

100, 100a, 100b‧‧‧ illuminated keyboard

1‧‧‧Backlight

11‧‧‧Light guide

111‧‧‧ top surface

112‧‧‧ bottom

1131, 1131', 114‧‧‧ side walls

115‧‧‧Network structure

12, 12a, 12b‧‧‧Lighting unit

121, 121a‧‧‧ rays

13‧‧‧Light absorbing layer

131‧‧‧through department

132‧‧‧Adhesive layer

14‧‧‧Lighting layer

141‧‧‧ shading area

142‧‧‧Lighting area

15, 15b‧‧‧Reflection Department

2‧‧‧Key device

21‧‧‧Key Cap

211, 221‧‧ ‧Lighting Department

22‧‧‧Substrate

23‧‧‧Connecting members

Fig. 1 is a schematic cross-sectional view showing an illuminated keyboard provided with a backlight according to a first embodiment of the present invention. Fig. 2 is a schematic cross-sectional view showing an illuminated keyboard provided with a backlight according to a second embodiment of the present invention. Fig. 3 is a cross-sectional view showing a light-emitting keyboard provided with a backlight according to a third embodiment of the present invention.

100‧‧‧ illuminated keyboard

1‧‧‧Backlight

11‧‧‧Light guide

111‧‧‧ top surface

112‧‧‧ bottom

1131, 1131'‧‧‧ side wall

115‧‧‧Network structure

12‧‧‧Lighting unit

121‧‧‧Light

13‧‧‧Light absorbing layer

132‧‧‧Adhesive layer

14‧‧‧Lighting layer

141‧‧‧ shading area

142‧‧‧Lighting area

15‧‧‧Reflection Department

2‧‧‧Key device

21‧‧‧Key Cap

22‧‧‧Substrate

211, 221‧‧ ‧Lighting Department

23‧‧‧Connecting members

Claims (14)

A backlight device for an illuminated keyboard, comprising: a light guide plate having a top surface as a light exiting surface; a light emitting unit disposed corresponding to a light incident surface of the light guide plate to provide light to the light guide plate; and a light absorbing layer The light guide plate is disposed under the light guide plate and faces the bottom surface of the light guide plate, and absorbs light emitted from the bottom surface of the light guide plate. The backlight device of claim 1, wherein the light guide plate is formed with a through portion penetrating vertically, the light incident surface is formed on one side wall of the through portion, and the light emitting unit is disposed in the through portion. The backlight device of claim 1, further comprising a light shielding layer disposed to cover a top surface of the light guide plate, and forming a light shielding region at a predetermined partial portion of a top surface of the light guide plate, and outside the partial portion The portion forms a plurality of light-transmissive regions, such that light emitted from the light-emitting surface of the light guide plate is transmitted through the light-transmitting region. The backlight device of claim 3, further comprising a plurality of separate reflecting portions, and wherein the surface of the light guiding plate is provided with a dot structure disposed between the upper surface of the light absorbing layer and the bottom surface of the light guiding plate And facing the plurality of light-transmissive regions, and corresponding to the dot structure for reflecting light emitted from the bottom surface of the light guide plate. The backlight device of claim 3, further comprising a reflecting portion, and wherein a surface of the light guiding plate is provided with a dot structure, the reflecting portion is disposed on a lower surface of the light absorbing layer and facing the light transmitting region, the light absorbing layer has Corresponding to the light-transmitting region and the dot structure, one of the penetrating portions penetrates vertically, and the reflecting portion reflects the light emitted from the bottom surface of the light guide plate through the penetrating portion. The backlight device of claim 4 or 5, wherein the dot structure is disposed on a light emitting surface of the light guide plate or a bottom surface of the light guide plate. The backlight device of claim 4 or 5, wherein the dot structure is disposed on a light emitting surface of the light guide plate and a bottom surface of the light guide plate. The backlight device of claim 1, wherein the light absorbing layer extends beyond a bottom surface of the light guide plate and covers a side surface of the light guide plate for absorbing light emitted from a side surface of the light guide plate. The backlight device of claim 1, wherein the light absorbing layer comprises an adhesive layer, and the adhesive layer is adhered to the bottom surface of the light guide plate. The backlight device of claim 8, wherein the light absorbing layer comprises an adhesive layer, and the adhesive layer is adhered to the bottom surface and the side surface of the light guide plate for adhering to the bottom surface of a keyboard substrate. The backlight device of claim 8, wherein the light absorbing layer comprises an adhesive layer adhered to the bottom surface, the side surface and the upper surface of the light guide plate for adhering to the bottom surface of a keyboard substrate. The backlight device of claim 9, 10 or 11, wherein the adhesive layer is a plurality of adhesive portions. The backlight device of claim 9, 10 or 11, wherein the adhesive layer is located on the entire surface of the light absorbing layer facing the light guide plate. An illuminated keyboard, comprising: the backlight device according to any one of claims 1 to 13; and a button device disposed above the backlight device and having at least one key cap, the keycap having a light transmission unit, The light transmitting portion is configured to transmit light emitted from the light guide plate of the backlight device through the light transmitting portion of the key cap.