TW201624515A - Backlight device and light emitting keyboard thereof - Google Patents

Abstract

A backlight device includes first and second light emitting diodes, first and second light blocking structures, a mask, a reflection sheet and a light-guide-plate module including first and second light guide plates. The second light guide plate is disposed under the first light guide plate. The first light emitting diode is for emitting a first light toward the light-guide-plate module. The first light emitting diode and the second light emitting diode for emitting a second light toward the light-guide-plate module are alternately arranged. The color of the first light is different from the color of the second light. The first light blocking structure extends from the mask for preventing the second light from being incident to the first light guide plate. The second light blocking structure extends from the reflection sheet for preventing the first light from being incident to the second light guide plate.

Description

Backlight device and its illuminated keyboard

The present invention relates to a backlight device and an illuminated keyboard thereof, and more particularly to a design in which a light shielding structure is disposed between a light guide plate and a light emitting diode to prevent the light of the light emitting diode from being accidentally incident into the corresponding light guide plate. Backlight device and its illuminated keyboard.

Please refer to FIG. 1, which is a partial cross-sectional view of the prior art illuminated keyboard 1. As shown in FIG. 1, the illuminated keyboard 1 includes a bottom plate 10, a film circuit board 12, a plurality of buttons 14, and a backlight device 16. Each of the buttons 14 is disposed on the bottom plate 10, and the film circuit board 12 is disposed between the bottom plate 10 and the plurality of buttons 14. When the user presses the button 14, the button 14 is pressed to trigger the film circuit board 12 to perform the use. The button functions you want to enter. The backlight unit 16 is disposed under the bottom plate 10 for providing a light source for illuminating the keyboard 1 . The backlight device 16 includes a light guide plate 18 and a light emitting unit 20 . The light guide plate 18 is disposed under the bottom plate 10 , and the light emitting unit 20 is disposed. On one side of the light guide plate 18, the light emitted by the light-emitting unit 20 can be totally reflected in the light guide plate 18, and the light is emitted from the light guide plate 18 by using a reflection point (not shown) at the bottom of the light guide plate 18, and then The direction of the bottom plate 10 is projected outside the button 14, thereby producing the effect of illuminating the illuminated keyboard 1.

In the above design, if it is desired to produce the effect of the two-color illuminating of the button, a design in which a single two-color illuminating diode is disposed on one side of the light guiding plate is generally employed. However, the above design tends to occur if the two-color illuminating diode is used. If the thickness is reduced to less than 0.4mm, the manufacturing cost is too high and the circuit design is complicated. If the configuration is changed to the red, green and blue LED module, the LED and the flexible circuit board must be generated. Significantly improved lighting with the problem of dual panel design The manufacturing cost of the backlight of the keyboard.

One of the objectives of the present invention is to provide a backlight device having a light-shielding structure disposed between a light guide plate and a light-emitting diode to prevent the light of the light-emitting diode from being incident on the light guide plate and the light-emitting plate thereof. The keyboard is used to solve the above problems.

According to an embodiment, the backlight device of the present invention uses at least one of a plurality of buttons for providing light to an illuminated keyboard. The backlight device includes a light guide plate module, at least one first light emitting diode, and at least one a second light emitting diode, a light shielding film, a reflective film, a first light shielding structure, and a second light shielding structure. The light guide plate module includes a first light guide plate and a second light guide plate. The second light guide plate is disposed under the first light guide plate. The at least one first light emitting diode is configured to emit a first light to the light guide plate module. The at least one second light emitting diode is disposed in a staggered manner with the at least one first light emitting diode, and is configured to emit a second light to the light guide plate module, the color of the first light is different from the The color of the second light. The light shielding sheet is disposed on the first light guiding plate and forms a light transmitting area at a position corresponding to the at least one of the plurality of keys, and the at least one first light emitting diode is projected through the first light guiding plate The first light or the second light emitted by the at least one second light emitting diode through the second light guide plate is incident on the at least one of the plurality of buttons through the light transmitting region. The reflective sheet is disposed under the second light guide plate. The first light shielding structure is formed by the light shielding sheet extending between the first light guide plate and the at least one second light emitting diode for limiting the incidence of the second light into the first light guide plate. The second light shielding structure is formed by the reflective sheet extending between the second light guide plate and the at least one first light emitting diode for limiting the incidence of the first light into the second light guide plate.

According to another embodiment, the illuminated keyboard of the present invention includes a backplane, a plurality of buttons, and a backlight. The plurality of buttons are disposed on the bottom plate. The backlight device is configured to provide light to at least one of the plurality of buttons, the backlight device comprising a light guide plate module, at least one a light emitting diode, at least one second light emitting diode, a light shielding film, a reflective sheet, a first light shielding structure, and a second light shielding structure. The light guide plate module is disposed under the bottom plate, and the light guide plate module comprises a first light guide plate and a second light guide plate. The second light guide plate is disposed under the first light guide plate. The at least one first light emitting diode is configured to emit a first light to the light guide plate module. The at least one second light emitting diode is disposed in a staggered manner with the at least one first light emitting diode, and is configured to emit a second light to the light guide plate module, the color of the first light is different from the The color of the second light. The light shielding sheet is disposed on the first light guiding plate and forms a light transmitting area at a position corresponding to the at least one of the plurality of keys, and the at least one first light emitting diode is projected through the first light guiding plate The first light or the second light emitted by the at least one second light emitting diode through the second light guide plate is incident on the at least one of the plurality of buttons through the light transmitting region. The reflective sheet is disposed under the second light guide plate. The first light shielding structure is formed by the light shielding sheet extending between the first light guide plate and the at least one second light emitting diode for limiting the incidence of the second light into the first light guide plate. The second light shielding structure is formed by the reflective sheet extending between the second light guide plate and the at least one first light emitting diode for limiting the incidence of the first light into the second light guide plate.

In summary, the present invention provides that the first light shielding structure is disposed between the second light guide plate and the first light emitting diode, and the second light shielding structure is disposed between the first light guide plate and the second light emitting diode. The design prevents the light of the first light-emitting diode and the second light-emitting diode from being incident on the light-guiding plate that is not corresponding to the light-emitting plate, thereby effectively solving the problem of color light interference, and generating a two-color light-emitting button effect. In this way, the present invention can effectively solve the reduced two-color mentioned in the prior art because the present invention does not need to be configured with a single two-color light-emitting diode and does not require a dual-panel design. The thickness of the LED itself will lead to high manufacturing cost and complicated circuit design. If the red, green and blue LED modules are used, the double panel design must be adopted, which greatly reduces the illumination of the keyboard. Manufacturing costs.

The advantages and spirit of the present invention can be obtained by the following embodiments and drawings. Go to further understanding.

1, 100‧‧‧ illuminated keyboard

10, 102‧‧‧ bottom plate

12, 122‧‧‧ film board

14, 104‧‧‧ button

16, 106, 106'‧‧‧ backlights

18‧‧‧Light guide

20‧‧‧Lighting unit

108‧‧‧Light guide plate module

110‧‧‧First Light Emitting Diode

112‧‧‧Second light-emitting diode

113‧‧ ‧ shading film

114‧‧‧First light guide

115‧‧‧reflector

116‧‧‧Second light guide

117‧‧‧Light transmission area

118‧‧‧First shading structure

120‧‧‧second shading structure

124‧‧‧Soft circuit board

T ₁ ‧‧‧ total thickness

T ₂ , T ₃ ‧‧‧ thickness

L ₁ ‧‧‧first light

L ₂ ‧‧‧second light

Figure 1 is a partial cross-sectional view of a prior art illuminated keyboard.

2 is a perspective view of an illuminated keyboard according to an embodiment of the present invention.

Figure 3 is a partial cross-sectional view of the illuminated keyboard of Figure 2 taken along section line A-A.

Figure 4 is a partial cross-sectional view of the illuminated keyboard of Figure 2 taken along section line B-B.

Figure 5 is a partial horizontal cross-sectional view of the backlight device of Figure 3 along section line C-C.

Figure 6 is a partial horizontal cross-sectional view of the backlight device of Figure 3 along section line D-D.

Figure 7 is a partial horizontal cross-sectional view of a backlight device according to another embodiment of the present invention.

Figure 8 is a horizontal cross-sectional view showing another portion of the backlight device of Figure 7.

Please refer to FIG. 2, FIG. 3, and FIG. 4, FIG. 2 is a perspective view of an illuminated keyboard 100 according to an embodiment of the present invention, and FIG. 3 is a cross-sectional line AA of the illuminated keyboard 100 of FIG. FIG. 4 is a partial cross-sectional view of the illuminated keyboard 100 of FIG. 2 along a section line BB. As shown in FIG. 2, FIG. 3, and FIG. 4, the illuminated keyboard 100 includes a bottom plate 102 and a plurality of The button 104 (only one of which is shown in FIGS. 3 and 4), and the backlight device 106. A plurality of buttons 104 are disposed on the bottom plate 102 for the user to perform a press input operation to perform a button function input by the user, and the backlight device 106 is configured to provide light to the plurality of buttons 104, thereby causing the backlight device 106 to The emitted light can be projected via the button 104, so that the illuminated keyboard 100 has a button illumination function.

The design of the backlight device 106 is described in detail herein. Please refer to FIG. 3, FIG. 4, FIG. 5, and FIG. 6. FIG. 5 is a partial level of the backlight device 106 along the section line CC of FIG. FIG. 6 is a partial horizontal cross-sectional view of the backlight device 106 of FIG. 3 along a section line DD. As shown in FIG. 3, FIG. 4, FIG. 5, and FIG. 6, the backlight device 106 includes a light guide plate. The module 108, the at least one first LED 201 (five in Figures 5 and 6 but not limited thereto), and at least one second LED 112 (in Figure 5 and 6 shows five, but not limited to this, the light shielding sheet 113, and the reflection sheet 115. The light guide plate module 108 is disposed under the bottom plate 102 and includes a first light guide plate 114 and a second light guide plate 116. The second light guide plate 116 is disposed under the first light guide plate 114, and the light shielding plate 113 is disposed on the first guide. plate 114 on the light in order to play the role of preventing light leakage and light transmitting regions 117 formed in a position corresponding to the button 104, such that the first light-emitting diode 110 via 114 projected by the first light L ₁ and the second first light guide plate The second light ray L ₂ projected by the light-emitting diode 112 through the second light guide plate 116 can be incident on the button 104 through the light-transmitting region 117 to generate a button light-emitting effect, and the reflective sheet 115 is disposed under the second light guide plate 116 to For reflecting the first light L ₁ and the second light L ₂ such that the first light L ₁ and the second light L ₂ can be surely emitted to the button 104 via the first light guide plate 114 and the second light guide plate 116, thereby improving the light emission. The key of the keyboard 100 is illuminated. In addition, as apparent from FIG. 3 and FIG. 4, a first light guide plate 114 and a second sum of one light guide plate 116 is less than the first thickness T ₁ based one light-emitting diode 110 and less than the second thickness T ₂ One of the thicknesses T _{3 of the} light-emitting diodes 112 (but not limited thereto, which may also be of equal thickness), thereby ensuring that the light of the first light-emitting diode 110 and the second light-emitting diode 112 can be incident to The light guide plate module 108 enhances the light use efficiency of the backlight device 106. It should be noted that the backlight device 106 can also have a different thickness of the first light guide plate 114 and the second light guide plate 116 to enhance the flexibility of the backlight device 106 in the design of the light guide plate. The first light-emitting diode 110 toward the light guide system to the first module 108 emits light L _1, and the second light-emitting diode 112 in a manner staggered lines of the first light-emitting diode 110 is provided to be used towards the The light guide plate module 108 emits a second light ray L ₂ . In this embodiment, the color of the first light ray L ₁ is different from the color of the second light ray L ₂ . For example, the first light emitting diode 110 can be a The white light emitting diodes are such that the first light ray L ₁ is white light, and the second light emitting diode 112 is a red light emitting diode such that the second light ray L ₂ is red light, but not limited thereto.

In addition, the backlight device 106 adopts a light shielding design to prevent the light emitted by the first light emitting diode 110 and the second light emitting diode 112 from being incident on the second light guide plate 116 and the first light guide plate 114, respectively. In a more detailed manner, the backlight device 106 further includes a first light-shielding structure 118 and a second light-shielding structure 120, wherein the first light-shielding structure 118 and the second light-shielding structure 120 are only slanted in the fifth and sixth figures. Show it. The first light shielding structure 118 is formed by the light shielding sheet 113 extending between the second light emitting diode 112 and the first light guiding plate 114 for limiting the second light L ₂ so that the second light L _{2 is} not incident to The first light guide plate 114, that is, the backlight device 106 can utilize the light shielding configuration of the first light shielding structure 118, so that the second light ray L ₂ emitted by the second light emitting diode 112 toward the first light guide plate 114 is The first light-shielding structure 118 is shielded (as shown in FIG. 3 ), whereby the backlight device 106 can effectively prevent the second light beam L ₂ emitted by the second light-emitting diode 112 from entering the first light guide plate 114 . . On the other hand, the second light shielding structure 120 may be formed by the reflective sheet 115 extending between the first light emitting diode 110 and the second light guiding plate 116 for limiting the first light ray L ₁ so that the first light ray L ₁ The light is not incident on the second light guide plate 116. That is, the backlight device 106 can utilize the light shielding configuration of the second light shielding structure 120 to cause the first light emitting diode 110 to emit the first light toward the second light guide plate 116. The L ₁ is blocked by the second light shielding structure 120 , whereby the backlight device 106 can effectively prevent the first light L ₁ emitted by the first light emitting diode 110 from entering the second light guide plate 116 .

In an actual application, the illuminated keyboard 100 can include a thin film circuit board 122 disposed between the bottom plate 102 and the plurality of buttons 104. When the user presses the button 104, the button 104 is pressed to trigger the thin film circuit board. 122, and further execute the button function that the user wants to input. In addition, as shown in FIG. 3 and FIG. 4 , the backlight device 106 may further include a flexible circuit board 124 , and the second LEDs 112 are disposed on the flexible circuit board in a staggered manner with the first LEDs 110 . 124, the flexible circuit board 124 is used to perform the illumination control of the first LED and the second LED 112. The related circuit design is common in the prior art, and thus will not be described herein.

Through the above configuration, for example, in the design that the first light emitting diode 110 is a white light emitting diode and the second light emitting diode 112 is a red light emitting diode, if the light emitting keyboard 100 is desired In the white light mode, only the first light emitting diode 110 needs to be turned on, whereby the first light L ₁ emitted by the first light emitting diode 110 can be guided by the light guiding of the first light guiding plate 114 (such as utilizing The bottom dot structure, etc., passes through the light-transmissive region 117 of the light-shielding sheet 113 to be directed toward the button 104 (as shown in FIG. 4), thereby producing the effect that the button 104 emits white light. In the above process, can be seen from Fig 4, arranged through a second shielding the light shielding structure 120, a first light-emitting diode emitting a first light toward the second light guide plate 110 120 116 L ₁ will be blocked second light shielding structure The backlight device 106 can effectively prevent the first light ray L ₁ emitted by the first illuminating diode 110 from entering the second light guide plate 116 to prevent white light interference.

On the other hand, if the illuminating keyboard 100 is to be in the red mode, the second illuminating diode 112 is only required to be turned on, whereby the second ray L ₂ emitted by the second illuminating diode 112 can be The light guiding design of the second light guiding plate 116 (such as using the bottom dot structure) is passed through the light transmitting area 117 of the light shielding sheet 113 to be directed to the button 104 (as shown in FIG. 3), thereby generating the effect of the red light of the button 104. . In the above process, as shown in FIG. 3, the second light ray L ₂ emitted by the second illuminating diode 112 toward the first light guide plate 114 is blocked by the first light shielding structure 118 through the light shielding arrangement of the first light shielding structure 118. By this, the backlight device 106 can effectively prevent the second light ray L ₂ emitted by the second illuminating diode 112 from entering the first light guide plate 114 to prevent red light interference.

In addition, if the light-emitting keyboard 100 is to be in the light mixing mode, the first light-emitting diode 110 and the second light-emitting diode 112 can be simultaneously turned on, and thus, the first light-emitting diode 110 is The first light ray L ₁ emitted and the second light ray L ₂ emitted by the second light-emitting diode 112 can be transparently transmitted through the light-shielding sheet 113 through the light guiding design of the first light guide plate 114 and the second light guide plate 116, respectively. The zone 117 is directed toward the button 104 to produce a light mixing effect in which the button 104 emits pink light.

It is to be noted that the arrangement of the first LEDs 110 and the second LEDs 112 is not limited to the above embodiment. For example, it may be as shown in FIG. 7 and FIG. 7 is a partial horizontal cross-sectional view of a backlight device 106' according to another embodiment of the present invention, and FIG. 8 is a horizontal cross-sectional view of another portion of the backlight device 106' of FIG. 7, wherein FIG. 7 and The position of the hatching used in Fig. 8 can refer to the position of the section line CC of Fig. 3 and the position of the section line DD of Fig. 4, respectively, and the first light shielding structure 118 and the second light shielding structure 120 are in Fig. 7 and In the figure 8, only the slash area is shown. The difference between the backlight device 106' and the backlight device 106 is only the arrangement of the first light emitting diode 110 and the second light emitting diode 112. As can be seen from the seventh and eighth figures, the first light emitting diodes adjacent to each other are adjacent to each other. The first light guide plate 114 and the second light guide plate 116 are separated between the body 110 and the second light-emitting diode 112. For other related descriptions of the backlight device 106', reference may be made to the above embodiment. No longer.

In summary, the present invention provides that the first light shielding structure is disposed between the second light guide plate and the first light emitting diode, and the second light shielding structure is disposed between the first light guide plate and the second light emitting diode. The design prevents the light of the first light-emitting diode and the second light-emitting diode from being incident on the light-guiding plate that is not corresponding to the light-emitting plate, thereby effectively solving the problem of color light interference, and generating a two-color light-emitting button The effect is that, compared to the prior art, since the present invention does not need to be configured with a single two-color light-emitting diode and does not require a double-panel design, the present invention can effectively solve the problems mentioned in the prior art. Reducing the thickness of the two-color LED itself will lead to high manufacturing cost and complicated circuit design. If the red, green and blue LED modules are used, the double panel design must be adopted, which greatly reduces the color of the illuminated keyboard. Manufacturing costs on luminescence.

The above description is only a preferred embodiment of the present invention, and the scope of the patent application according to the present invention is Equal variations and modifications are intended to be within the scope of the present invention.

100‧‧‧ illuminated keyboard

102‧‧‧floor

104‧‧‧ button

106‧‧‧Backlight

108‧‧‧Light guide plate module

110‧‧‧First Light Emitting Diode

113‧‧ ‧ shading film

114‧‧‧First light guide

115‧‧‧reflector

116‧‧‧Second light guide

117‧‧‧Light transmission area

120‧‧‧second shading structure

122‧‧‧Film board

124‧‧‧Soft circuit board

T ₁ ‧‧‧ total thickness

T ₂ ‧‧‧ thickness

L ₁ ‧‧‧first light

Claims (6)

A backlight device for providing light to at least one of a plurality of buttons of a light-emitting keyboard, the backlight device comprising: a light guide plate module comprising: a first light guide plate; and a second light guide plate disposed on the Under the first light guide plate; at least one first light emitting diode for emitting a first light to the light guide plate module; at least one second light emitting diode, and the at least one first light emitting diode The body is arranged in a staggered manner for emitting a second light to the light guide plate module, the color of the first light is different from the color of the second light; and a light shielding film is disposed on the first light guide plate Forming a light-transmitting region at a position corresponding to the at least one of the plurality of buttons, the first light or the at least one first projected by the at least one first light-emitting diode via the first light guide plate The second light emitted by the second light-emitting diode through the second light guide plate is incident on the at least one of the plurality of buttons through the light-transmitting region; a reflective sheet disposed under the second light guide plate a first light-shielding structure The light shielding sheet is formed to be disposed between the first light guide plate and the at least one second light emitting diode for restricting incidence of the second light into the first light guide plate; and a second light shielding structure, The reflective sheet is formed to be disposed between the second light guide plate and the at least one first light emitting diode for limiting the incidence of the first light into the second light guide plate. The backlight device of claim 1, wherein a sum of the first light guide plate and the second light guide plate is less than or equal to a thickness of the at least one first light emitting diode and less than or equal to the at least one One of the thickness of the two light-emitting diodes. The backlight device of claim 2, wherein a thickness of one of the first light guide plates is different from a thickness of the second light guide plate. An illuminated keyboard comprising: a bottom plate; a plurality of buttons disposed on the bottom plate; and a backlight device for providing light to at least one of the plurality of buttons, the backlight device comprising: a light guide plate mold The light guide plate module comprises: a first light guide plate; and a second light guide plate disposed under the first light guide plate; at least one first light emitting diode is used for Transmitting a first light to the light guide plate module; at least one second light emitting diode disposed in a staggered manner with the at least one first light emitting diode for transmitting a first light to the light guide plate module a second light, the color of the first light is different from the color of the second light; a light shielding film disposed on the first light guide plate and forming a position corresponding to at least one of the plurality of keys a light-transmitting region, the first light emitted by the at least one first light-emitting diode via the first light guide plate or the second light-emitting diode projected by the second light-emitting diode Light is incident through the light transmitting region to At least one of the plurality of buttons; a reflective sheet disposed under the second light guide plate; a first light blocking structure extending from the light shielding sheet to be located at the first light guide plate and the at least one second Between the light-emitting diodes for limiting the incidence of the second light into the first light guide plate; and a second light-shielding structure extending from the reflective sheet to be located on the second light guide plate and the Between the first light-emitting diodes and the first light-emitting diodes, the first light is incident on the second light guide plate. The illuminating keyboard of claim 4, wherein a sum of the first light guide plate and the second light guide plate is less than or equal to a thickness of the at least one first light emitting diode and less than or equal to the at least one One of the thickness of the two light-emitting diodes. The illuminating keyboard of claim 5, wherein a thickness of one of the first light guide plates is different from a thickness of the second light guide plate.