CN105425331B - Backlight module and its light guide plate - Google Patents
Backlight module and its light guide plate Download PDFInfo
- Publication number
- CN105425331B CN105425331B CN201510765541.8A CN201510765541A CN105425331B CN 105425331 B CN105425331 B CN 105425331B CN 201510765541 A CN201510765541 A CN 201510765541A CN 105425331 B CN105425331 B CN 105425331B
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- Prior art keywords
- light
- hole
- backlight module
- guide plate
- light source
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Classifications
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- 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
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S8/00—Lighting devices intended for fixed installation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
For the present invention about a kind of backlight module and its light guide plate, backlight module includes light source unit, light guide plate and the optical layer for being set to light guide plate side, and light guide plate includes at least one opening for having the plate ontology of incidence surface and being formed in plate ontology.Plate ontology extends along X-Y axial planes, and the normal direction of X-Y axial planes is Z axis.After light enters light guide plate via incidence surface, advance along X-Y axial planes.Opening is extended in along Z axis in plate ontology or even through plate ontology, and tapered section is projected as on X-Y axial planes.Tapered section includes basal area and angular extension area, and angular extension area is from the angular extension in one end of basal area and compared with basal area close to light source unit.Optical layer has through-hole to positive basal area, and angular extension area in optical layer projection at least partially on the outside of through-hole.The present invention is designed by opening of the light-emitting surface with tapered section is parallel to, and can improve the light leakage phenomena of opening so that the brightness of keyboard is evenly.
Description
Technical field
The present invention relates to a kind of backlight module and its light guide plate, more particularly to it is a kind of be suitable for notebook computer keyboard and
The backlight module and its light guide plate of opening light leakage can be reduced.
Background technology
With the evolution of technology and the promotion of notebook computer specification, illuminated keyboard has been increasingly becoming notebook computer
Mainstream input unit.Illuminated keyboard is usually made of the backlight module of the button module of top and lower section, and backlight module
It is closely sized to button module size；Such backlight module, which can be laminated, to be extended in below entire button module, allows entire illuminated keyboard
The light emission luminance of different zones keeps uniform.
But more swimmingly from above backlight module flowing underneath to backlight module, avoid backlight mould in order to which (1) enables air to
Group obstruction notebook computer heat source (such as：Microprocessor, southern north bridge chipset, display accelerate chip) heat dissipation, (2) penetrate
Through a plurality of screws of backlight module, entire illuminated keyboard is locked in notebook computer mechanism, or (3) coordinate machine
Structure designs, and several recessed openings are needed to form in backlight module；Therefore backlight module in the prior art need to usually open up plural number
A heat dissipation runs through holes or recessed openings through holes, screw.However, as illustrated in figures 1A and ib, the backlight mould of the prior art
The heat dissipation holes or screw holes 1010 of group 1000 are to be laminated to positive circular hole 1001~1003, cause more light that can enter
In cylindrical holes 1010, so from the lost light of cylindrical holes 1010, it will cause right over holes 1010 or attached
Close keycap font brightness is far above other fonts, and the button of entire keyboard is made to have non-uniform light emission luminance.
Therefore, it how to be effectively improved the light leakage phenomena through holes or recessed openings, for one of the emphasis of research and development.
Invention content
A kind of backlight module of present invention offer and its light guide plate, it is above-mentioned existing through holes or the light leakage of recessed openings to improve
As.
The present invention provides a kind of light guide plate, and to receive the light of light source unit, which includes：
Plate ontology extends along X-Y axial planes, and the normal direction of the X-Y axial planes is Z-direction, which has
Incidence surface after the light enters the light guide plate via the incidence surface, is advanced along the X-Y axial planes；And
At least one opening, is formed in the plate ontology, which extends in along the Z-direction in the plate ontology, the opening
It includes basal area and angular extension area to have tapered section, the tapered section on the X-Y axial planes, which certainly should
The angular extension in one end of basal area and compared with the basal area close to the incidence surface.
As optional technical solution, it is 30 degree to 45 degree which, which has apex angle, the apex angle,.
As optional technical solution, which has basal area central point, the basal area central point and the incidence surface
The wire definition at midpoint be light leakage path, which has apex angle center line, the apex angle center line and the light leakage road
The angle of diameter is less than 90 degree.
As optional technical solution, which is circular hole, which is the center of circle of the circular hole, the center of circle
Wire definition with the midpoint of the incidence surface is the light leakage path.
As optional technical solution, which includes two bevel edges and an apex angle, which is the circular hole
Two tangent lines, two tangent line intersect to form the apex angle.
As optional technical solution, which is elliptical aperture, which is in the ellipse of the elliptical aperture
The wire definition at the heart, the elliptical center and the midpoint of the incidence surface is the light leakage path；Alternatively, the basal area is that smooth vertex is more
Side shape hole, the basal area central point are the geometric center of the smooth vertex polygonal hole, in the geometric center and the incidence surface
The wire definition of point is the light leakage path.
As optional technical solution, which also includes ink layer, which is coated on along the X-Y axial planes
On the plate ontology, and the ink layer has the shape of the tapered section of the corresponding opening to surround the opening.
As optional technical solution, which also includes light source hole, which is formed in the plate ontology for holding
Set the light source unit, and the incidence surface is the plate ontology in the side wall in the light source hole.
The present invention also provides a kind of backlight module, which includes：
Light source unit, to provide light；
Light guide plate as described above；And
First optical layer is set to the side of the light guide plate, which has first through hole to the just basal area,
And the angular extension area in first optical layer projection at least partially in the first through hole outside.
As optional technical solution, which also includes the second optical layer, wherein second optical layer relative to
First optical layer is set to the other side of the light guide plate, second optical layer have the second through-hole to the just basal area and this
One through-hole, and the angular extension area in second optical layer projection at least partially in second through-hole outside.
As optional technical solution, which is one of reflecting layer and shielded layer, and second light
It is the wherein another of the reflecting layer and the shielded layer to learn layer.
As optional technical solution, which also includes first light source hole, which also includes the second light
Source aperture includes luminescence component to being just connected to the first light source hole, the light source unit, and the luminescence component is from below first optical layer
The first light source hole is stretched by the second light source hole.
As optional technical solution, which runs through the plate ontology, the first through hole and the substrate along the Z-direction
Area is to being just connected to so that external fixation device may pass through the first through hole and the basal area.
Compared with prior art, backlight module and its light guide plate of the invention have tapered section by light-emitting surface is parallel to
Opening design, the light for being refracted into opening can be greatly decreased, and fraction is refracted into the light of opening, can be capped on
The shielded layer of both sides and reflecting layer absorb or reflect angular extension area up and down, and then improve the light leakage phenomena of opening so that keyboard
The keycap font of device has more uniform brightness.
Description of the drawings
Figure 1A and Figure 1B be respectively the prior art backlight module in light advance schematic cross-section and schematic side view；
Fig. 2 is the signal that illuminated keyboard is constituted after being combined with button module using the backlight module of one embodiment of the invention
Figure；
Fig. 3 A and Fig. 3 B are the explosive view and schematic partial cross-sectional view of the backlight module of one embodiment of the invention；
Fig. 3 C are the schematic cross-section of the opening of one embodiment of the invention；
Fig. 4 A to Fig. 4 C are the schematic cross-section of the opening of other embodiments of the present invention；
Fig. 5 A to Fig. 5 C are the configuration schematic diagram of the opening of different embodiments of the invention；
Fig. 6 A to Fig. 6 C are the configuration schematic diagram in the first light source hole of the light guide plate of different embodiments of the invention；
Fig. 7 A and Fig. 7 B be respectively one embodiment of the invention backlight module in light advance schematic cross-section and side
Depending on schematic diagram；
Fig. 8 A and Fig. 8 B are the explosive view and schematic partial cross-sectional view of the backlight module of another embodiment of the present invention；
Fig. 9 A and Fig. 9 B are the explosive view and schematic partial cross-sectional view of the backlight module of another embodiment of the present invention；
Figure 10 A and Figure 10 B are respectively the light guide plate of another embodiment of the present invention and the stereogram of light source unit and vertical view；
Figure 11 A to Figure 11 C are respectively the forward and backward stereogram of combination of the light guide plate and light source unit of another embodiment of the present invention
And vertical view after combination；
Figure 12 is the schematic diagram of the light guide plate of another embodiment of the present invention.
Specific implementation mode
Below in conjunction with the drawings and specific embodiments, the present invention will be described in detail, but not as a limitation of the invention.
The backlight module of the present invention can be applied to such as illuminated keyboard, be particularly applied to the light key of notebook computer
Disk, it is existing with the light leakage for reducing heat dissipation holes, screw holes or recessed openings it includes the light guide plate of horizontal tapered shaped opening design
As so that keycap font is showed with uniform brightness, but not limited to this.
Fig. 2 is the signal that illuminated keyboard is constituted after being combined with button module using the backlight module of one embodiment of the invention
Figure, referring to Fig. 2, illuminated keyboard, which includes the backlight module 1 of the present invention and button module 2, wherein backlight module 1, is set to button
2 lower section of module simultaneously has a plurality of heat dissipation holes, screw holes or recessed openings 11, and button module 2 includes a plurality of buttons
22 and can be any suitable button module with light-permeable keycap.In the present embodiment, radiate holes, screw holes or recessed
The installation position and number for falling into opening 11 can be according to the heat dissipations and configuration for the electronic device (such as notebook computer) applied
Changes in demand, not to be limited shown in embodiment.For example, holes 11 is radiated at the heat source closer to notebook computer,
It may generally be of the configuration of comparatively dense.
Fig. 3 A and Fig. 3 B are the explosive view and schematic partial cross-sectional view of the backlight module of one embodiment of the invention, such as Fig. 3 A
And shown in Fig. 3 B, backlight module 1 includes light guide plate 10, light source unit 20, reflecting layer 30 and shielded layer 40, wherein light source unit 20
To provide light to light guide plate 10；Reflecting layer 30 be set to the side (such as lower section) of light guide plate 10 and shielded layer 40 relative to
Reflecting layer 30 is set to the other side (such as top) of light guide plate 10.Specifically, light source unit 20 includes preferably plural number hair
A luminescence component 210 and circuit board 220, wherein luminescence component 210 can be light emitting diode (LED), and especially preferably side is sent out
The light emitting diode of light, to provide light to light guide plate 10, and circuit board 220 is preferably flexible circuit board, but not as
Limit.In other words, the light source unit 20 that a plurality of luminescence components 210 are integrated by circuit board 220, to promote assembling effect
Rate.
Light guide plate 10 can be used to the light received from light source unit 20, and wherein light guide plate 10 includes plate ontology 100 and formed
In at least one opening 110 of plate ontology 100.Plate ontology 100 can be by any suitable optical material (such as optic polymer)
Manufactured plate, and extend along X-Y axial planes, and the normal direction of X-Y axial planes is Z-direction.In the present embodiment, Z
Axis direction is the thickness direction of plate ontology 100, and plate ontology 100 is preferably much larger than in Z-direction in the size of X, Y direction
Size so that plate ontology 100 be thin plate or sheet form.Plate ontology 100 is rectangular panel body, preferably sized corresponds to button
The size of module 2.The light-emitting surface that plate ontology 100 has the incidence surface 101 of parallel Y-Z axial planes and extends along X-Y axial planes
102.It after the light that light source unit 20 provides enters light guide plate 10 via incidence surface 101, advances along X-Y axial planes, and goes out certainly
Smooth surface 102 projects.Specifically, the light that the luminescence component 210 of light source unit 20 provides enters light guide plate via incidence surface 101
It after 10, advances along X-Y axial planes, and is projected from light-emitting surface 102.
At least one opening 110 is formed in plate ontology 100, wherein in one embodiment, opening 110 extends in plate along Z axis
Recessed openings (i.e. blind hole) are formed in ontology 100, or in another embodiment, as shown in Figure 3B, opening 110 is prolonged along Z axis
It stretches and is formed through plate ontology 100 and run through holes.Fig. 3 C are the schematic cross-section of the opening of one embodiment of the invention, such as Fig. 3 C institutes
Show, opening 110 has tapered section 110a on X-Y axial planes, wherein tapered section 110a includes basal area 112 and angular prolongs
Stretch area 114, angular extension area 114 is from the angular extension in one end of basal area 112 and compared with basal area 112 close to light source unit 20.Tool
For body, opening 110 can be in the opening for being machined formation on the X-Y axial planes of plate ontology 100 or by molding forming institute
The opening of formation, and be open and 110 be set as the angular extension area 114 of tapered section 110a than basal area 112 closer to entering light
Face 101.In other words, on the light-emitting surface 102 of parallel X-Y plane, opening 110 has tapered section 110a；The tapered section
110a has larger width in the basal area 112 far from incidence surface 101, is then gradually reduced from one end of basal area 112, and makes
There is the section shape of similar triangle close to the angular extension area 114 of incidence surface 101.In this embodiment, tapered section
The basal area 112 of 110a be preferably with positive round shape circular hole, and angular extension area 114 include two bevel edge 114a, 114b and
Apex angle 114c, wherein two bevel edge 114a, 114b straight lines relative tilt in the same direction extends and intersection forms apex angle 114c.Also that is, substrate
When area 112 is circular hole, two bevel edge 114a, 114b are preferably two tangent lines of circle hole shape basal area 112, and two tangent lines are intersected and formed
Apex angle 114c so that tapered section 110a is preferably drops section, and but not limited to this.
Fig. 4 A to Fig. 4 C are the schematic cross-section of the opening of other embodiments of the present invention, as shown in Fig. 4 A to Fig. 4 C, at it
In its embodiment, according to actual demand, the basal area 112 of tapered section 110a can be with the smooth geometry in other vertex
(such as ellipse, rectangle, hexagon etc.), and so that tapered section 110a is the tapered section with non-circular basal area.
The vertex of the geometry is preferably smoothed curve, that is, the open edge of basal area 112 is avoided to occur by two straightways
The constituted included angle of straight line of intersection, spotlight effect that so can be to avoid light guide plate at open edge included angle of straight line lead to side
Backlight is especially bright at edge included angle of straight line.In addition, angular extension area 114 shown in Fig. 3 C and Fig. 4 A~4C preferably has length phase
Deng two bevel edge 114a, 114b, but not limited to this.In other embodiments, foundation actual demand, angular extension area 114
Two bevel edge 114a, 114b can also have different length.
The angle, θ of apex angle 114c is preferably 30 degree to 45 degree, so as to enter derived from incidence surface 101 and advance along X-direction
Light can be reflected when meeting two bevel edge 114a, the 114b for constituting apex angle 114c so that the light for entering opening 110 is big
Width is reduced, and then reduces the light leakage phenomena that light is projected from opening 110.Herein it may be noted that apex angle 114c can be two bevel edge 114a,
The wedge angle apex angle or arc apex angle of 114b intersections, but preferably arc apex angle.When apex angle 114c is arc apex angle, apex angle 114c
Two bevel edge 114a, 114b of ranging from arc apex angle of angle, θ extend the folded angular range of intersection.In addition, opening 110
Installation position and number can be according to the electronic device applied heat dissipation and configuration needs variation, not to be limited shown in embodiment.
For example, opening 110 may generally be of the configuration of comparatively dense at the heat source closer to notebook computer.
Fig. 5 A to Fig. 5 C are the configuration schematic diagram of the opening of different embodiments of the invention, and as shown in Figure 5A, basal area 112 has
There is basal area central point 112a, and the wire definition of the basal area central point 112a and midpoint M of incidence surface 101 is light leakage path
(such as P1~P3).For example, when basal area 112 is circular hole, basal area central point 112a is the center of circle of circular hole, and the center of circle
The wire definition of the 112a and midpoint M of incidence surface 101 is light leakage path (such as P1~P3).When basal area 112 is other suitable
Shape when (as shown in figs. 4 a-4 c), basal area central point 112a is the geometric center of 112 shape of basal area, and basal area
The line of the geometric center 112a of the 112 shapes and midpoint M of incidence surface 101 also can define out light leakage path.For example, as schemed
Shown in 4A, basal area 112 be elliptical aperture, basal area central point 112a be the elliptical aperture elliptical center, elliptical center 112a with
The wire definition of the midpoint M of incidence surface 101 goes out light leakage path；As shown in Fig. 4 B~4C, basal area 112 is smooth vertex polygon
Hole (such as rectangular opening, hex hole), basal area central point 112a are the geometric center of smooth vertex polygonal hole, geometric center
112a and the wire definition at the midpoint of incidence surface 101 go out light leakage path.
Angular extension area 114 has apex angle center line (such as CL1~CL3), wherein apex angle center line and light leakage path
Angle (such as θ 1, θ 2) is preferably less than 90 degree.In other words, angular extension area 114 is closer to incidence surface 101 compared with basal area 112,
And angular extension area 114 can tilt or parallel relative to the normal direction (X-direction) of incidence surface 101.For example, such as Fig. 5 A
Shown, the corresponding incidence surface 101 of three openings 110,110 ', 110 " is arranged, and the midpoint M of 110 face incidence surface 101 of split shed is set
It sets, and opening 110 ', 110 " is respectively arranged at the both sides of opening 110.In this present embodiment, the top of opening 110 ', 110,110 "
Angle center line CL1~CL3 is parallel to the normal direction (X-direction) of incidence surface 101, the apex angle center line CL2 of split shed 110
Overlapped with light leakage path P 2 (i.e. its angular extension area 114 apex angle be directed toward smooth surface 101 midpoint M, and apex angle center line CL2 with
The angle of light leakage path P 2 is zero degree), apex angle center line CL2 is extended to the midpoint M that can intersect incidence surface 101.Opening
110 ', 110 " apex angle center line CL1, CL3 is less than 90 degree with the angle of light leakage path P 1, P2 respectively.
In another embodiment, as shown in Figure 5 B, the corresponding incidence surface 101 of three openings 110,110 ', 110 " is arranged, wherein
Be open 110 face incidence surfaces 101 midpoint M setting, and be open 110 ', 110 " be respectively arranged at opening 110 both sides.Yu Benshi
It applying in example, the 110 apex angle center line CL2 of being open is parallel to the normal direction (X-direction) of incidence surface 101, and be open 110 ',
The normal direction (X-direction) that 110 " apex angle center line CL1, CL3 is respectively relative to incidence surface 101 tilts so that opening
110 ', 110,110 " apex angle center line CL1~CL3 is preferably directed to the midpoint M of incidence surface 101.Also that is, opening 110 ',
110,110 " apex angle center line CL1~CL3 is overlapped with 1~P3 of light leakage path P respectively, and apex angle center line CL1~CL3 is subject to
The midpoint M of incidence surface 101 can be intersected by extending.In other words, correspond in incidence surface 101 when 110 ', 110 " setting of opening is positive
When the point positions M, opening 110 ', 110 " can be obliquely installed relative to the normal direction (X-direction) of incidence surface 101 so that opening
The apex angle of 110 ', 110 " angular extension area 114 is preferably towards the midpoint positions M of incidence surface 101.
Though the midpoint M that the embodiment of Fig. 5 A and Fig. 5 B are painted incidence surface 101 is what plate ontology 100 extended along Y-Z axial planes
Side is in the midpoint in Y-axis, and but not limited to this.In other embodiments, as shown in Figure 5 C, different openings also can define and have
The midpoint of different incidence surfaces 101, such as：(1) it is directed to opening 110 ', the midpoint M1 of incidence surface 101 can be " luminescent module
Light-emitting surface normal is extended at the light-emitting surface midpoint of 210', the position which intersects with incidence surface 101 ", (2) are directed to and open
The midpoint M2 of mouth 110, incidence surface 101 can be that " light-emitting surface normal is extended at the light-emitting surface midpoint of luminescent module 210, this shines
The position that face normal is intersected with incidence surface 101 ", (3) for opening 110 ", the midpoint M3 of incidence surface 101 can be " luminescent module
Light-emitting surface normal is extended at 210 " light-emitting surface midpoint, the position which intersects with incidence surface 101 "；Can thereby it make
Obtain plural opening 110 ', 110,110 " and closest highlighting luminescence component 210 ', 210,210 " corresponding incidence surfaces 101
Midpoint M1~M3 define light leakage 1~P3 of path P respectively so that be respectively open 110 ', 110,110 " apex angle center line
CL1~CL3 is less than 90 degree (in the present embodiment, angle is zero degree) with the angle of 1~P3 of corresponding light leakage path P respectively.
Furthermore in one embodiment, as shown in Fig. 3 A and Fig. 3 B, light guide plate 10 has been formed about a plurality of in middle section position
First light source hole 130, and a plurality of luminescence components 210 of light source unit 20.These luminescence components 210 make corresponding arrangement, and
It can be respectively contained in a plurality of first light source holes 130, such incidence surface 101 is plate ontology 100 in flat in first light source hole 130
Row is in the side wall of Y-Z axial planes.Specifically, plural first light source hole 130 is arranged along Z axis through plate ontology 100 and along Y direction
It arranges and plate ontology 100 is distinguished into left side and right side, and above-mentioned plural number opening 110 is distributed in 130 both sides of first light source hole
Plate ontology 100 two half portion of left and right in.In the present embodiment, 14 first light source holes 130 along X-axis and Y direction with array
Mode is configured at the centre of light guide plate 10, wherein being configured to two row (such as left column X1, right row X2) along X-axis, and is respectively arranged along Y-axis
X1, X2 are respectively provided with 7 light source holes 130.A plurality of luminescence components (such as 14) are arranged in corresponding first light source hole respectively
In 130, to provide the light guide plate 10 that light enters both sides respectively from the incidence surface 101 in corresponding first light source hole 130.In this reality
It applies in example, first light source hole 130 is rectangular opening, and wherein the incidence surface 101 of the light source hole 130 of left column X1 is the left side of rectangular opening
Wall, and the right side wall that the incidence surface 101 of the light source hole 130 of right row X2 is rectangular opening.Specifically, each first light source hole 130 compared with
Be correspondingly arranged a luminescence component 210 goodly so that be set to the luminescence component 210 of left column X1 towards be used as in light source hole 130 into
The left side wall of smooth surface 101 provides light, and is set to the luminescence component 210 of right row X2 towards being used as incidence surface 101 in light source hole 130
Right side wall light is provided so that the light that plural luminescence component 210 provides respectively enters first light source hole 130 or so two
The plate ontology 100 of side, and light via incidence surface 101 enter light guide plate 10 after, along both sides X-Y axial planes advance.
In addition, though plural first light source hole 130 of illustrating in Fig. 3 A is configured to symmetrically two row X1, X2 of left and right, not with this
It is limited.Fig. 6 A to Fig. 6 C are the configuration schematic diagram in the first light source hole of the light guide plate of different embodiments of the invention, in other implementations
Example in, as shown in Figure 6A, plural first light source hole 130 can be configured to asymmetric left and right two arrange X1 ', X2 ', and two row X1 ',
130 number of first light source hole of X2 ' may be the same or different.In other embodiments, plural first light source hole 130 ' can be configured to
Only one arranges X3 (as shown in Figure 6B), and the part luminescence component in plural first light source hole 130 ' irradiates to the left, part luminescence component
It irradiates to the right；Or plural light source hole is even integrated into only one first light source hole 130 " (as shown in Figure 6 C), and first light source
Hole 130 ', 130 " can have larger size, to wear more than two luminescence components in first light source hole 130 ', 130 "
210, and achieve the effect that towards 100 left and right sides irradiation of plate ontology.In other words, the accommodating hair in first light source hole 130 ', 130 " is utilized
When optical assembly 210, the opposite two side in first light source hole 130 ', 130 " (left side wall and right side wall) is respectively as left side and the right side
The incidence surface 101 of half portion plate ontology.
As shown in Fig. 3 A and Fig. 3 B, reflecting layer 30 is set to 10 lower section of light guide plate, will be leaked from 10 lower surface of light guide plate
The light reflection gone out returns to light guide plate 10.Specifically, being set to the reflecting layer 30 of 100 lower section of plate ontology can reflect from plate ontology
The lost luminous energy in 100 lower surfaces, the luminous energy for keeping lower surface lost come back in plate ontology 100, continue later with flat along X-Y axis
Face is advanced, or is projected from light-emitting surface 102.Reflecting layer 30 can be reflecting material formed reflection diaphragm (such as metal foil) or
Non-reflecting coating on piece coating reflecting material is formed by reflecting layer.The shape in reflecting layer 30, preferably sized respective panels ontology
100.Reflecting layer 30 has first through hole 310 to positive basal area 112 (such as circular hole), and angular extension area 114 is in reflecting layer 30
On projection at least partially in first through hole 310 outside.Specifically, the 310 preferable corresponding keys of first through hole in reflecting layer 30
The heat dissipation holes or screw holes of disk device, the number of first through hole 310 and position correspond to the opening 110 of light guide plate 10, and
The shape of one through-hole 310 is preferably hole shape.In one embodiment, by taking the basal area of hole shape 112 (i.e. circular hole) as an example,
When light guide plate 10 and reflecting layer 30 are stacked, the center of circle of the circular hole as basal area 112 is preferably directed at the circle of first through hole 310
The heart is so that basal area 112 and first through hole 310 are to just, and the radius of basal area 112 is preferably substantially greater than or logical equal to first
The radius in hole 310.When 110 basal area 112 of being open is other geometries, geometry as basal area 112
The center of circle of geometric center preferred alignment first through hole 310 so that basal area 112 and first through hole 310 to just.Furthermore opening 110
Projection of the basal area 112 on reflecting layer 30 can preferably cover first through hole 310, and at least portion of angular extension area 114
Divide and exceed first through hole 310, and reflecting layer 30 is made to cover the angular extension area 114 beyond first through hole 310.
In addition, reflecting layer 30 includes also second light source hole 320, wherein second light source hole 320 is to being just connected to corresponding first
Light source hole 130.Also that is, in the present embodiment, second light source hole 320 preferably have number identical with first light source hole 130,
Shape and configuration, and there is one-to-one connected relation, but not limited to this.In other embodiments, second light source hole 320
Can have different numbers, size and shape, as long as light guide plate 10 is stacked with reflecting layer 30, first from first light source hole 130
The part that light source hole 130 and second light source hole 320 are connected to is for accommodating plural luminescence component 210.As shown in Figure 3B, when leading
When tabula rasa 10, reflecting layer 30 and light source unit 20 combine, the opening 110 of light guide plate 10 and the first through hole 310 in reflecting layer 30 are right
Just so that the luminescence component 210 of light source unit 20 can the lower section of self-reflection layer 30 first light source hole is stretched by second light source hole 320
130, and the basal area 112 of opening 110 is to positive first through hole 310 so that the angular extension area of at least covering part of reflecting layer 30
114。
In addition, shielded layer 40 is set to the top of light guide plate 10, and with light-shielding pattern with selective local stop light or
Light is allowed to pass through.Specifically, shielded layer 40 is to have design on the optical diaphragm of light-permeable and diaphragm, to cover pair
Key board unit is answered not need the part of light.For example, shielded layer 40 can have the pattern of the configuration of corresponding plural button, make
Gap between adjacent key shielded the position for light not being allowed to pass through, and corresponding to plural button may be allowed light by with
Make light that can be projected from keycap.In one embodiment, the shape of shielded layer 40, preferably sized respective panels ontology 100.Furthermore
Shielded layer 40 has the second through-hole 410 to the basal area 112 of the opening 110 of positive light guide plate 10 and the first through hole in reflecting layer 30
310, and projection of the angular extension area 114 of opening 110 on shielded layer 40 is at least partially in the outside of the second through-hole 410.
Number, position and the shape of second through-hole 410 of shielded layer 40 preferably correspond to the first through hole 310 in reflecting layer 30,
That is, second through-hole 410 be preferably circular hole identical with 310 radius of first through hole.As shown in Figure 3B, when shielded layer 40, light guide plate
10, when reflecting layer 30 and light source unit 20 are combined into backlight module 1, the center of circle of the circular hole as basal area 112 (or other geometry
The geometric center of shape) it is preferably directed at the center of circle of first through hole 310 and the second through-hole 410, and the radius of basal area 112 is preferable
Ground is substantially greater than or equal to first through hole 310 and the radius of the second through-hole 410.Furthermore be open 110 basal area 112 in reflection
First through hole 310 and the second through-hole 410 are covered in the projection of layer 30 and shielded layer 40 respectively, and angular extension area 114 is at least partly
Beyond first through hole 310 and the second through-hole 410, and shielded layer 40 and reflecting layer 30 is made at least partly to be covered in angular prolong respectively
Stretch area 114 over and under.It is stretched by second light source hole 320 210 self-reflection layer of luminescence component, 30 lower section of light source unit 20
Enter first light source hole 130, and shielded layer 40 is covered in 210 top of luminescence component.In addition, when opening 110 is holes form, and shield
When covering layer 40, light guide plate 10, reflecting layer 30 and light source unit 20 and being combined into backlight module 1, first through hole 310, be open 110 base
Bottom area 112 and the second through-hole 410 to form through hole to being just connected to so that external fixation device (such as plug, screw etc.) can be worn
First through hole 310, basal area 112 and the second through-hole 410 are crossed to fix backlight module 1.
Fig. 7 A and Fig. 7 B be respectively one embodiment of the invention backlight module in light advance schematic cross-section and side
Depending on schematic diagram, as shown in figs. 7 a and 7b, by the design of the tapered section 110a of opening 110, from the entrance of incidence surface 101 and edge
The light that X-direction is advanced can be reflected when meeting two bevel edge 114a, the 114b for constituting angular extension area 114 so that into
The light for entering opening 110 is greatly decreased, and then reduces the light leakage that light is projected from opening 110.In addition, being holes with opening 110
For form, at least partly angular extension area 114 is covered in over and under by shielded layer 40 and reflecting layer 30, allows light leakage
The multiple attenuation in the space of both shielded layer 40 and reflecting layer 30 cladding, can be further reduced light from angular extension area
114 possibilities projected.
Reflecting layer 30 and shielded layer 40 are the first optical layer and the second optical layer for being set to 10 opposite sides of light guide plate,
In the first optical layer can be one of reflecting layer 30 and shielded layer 40, and the second optical layer can be reflecting layer 30 and shielded layer
40 it is wherein another.I.e. when the first optical layer is reflecting layer 30, the second optical layer is then shielded layer 40, or when the first light
When layer is shielded layer 40, the second optical layer is reflecting layer 30.Though illustrating 10 both sides of light guide plate difference in the above-described embodiments
Reflecting layer 30 and shielded layer 40 are set, however according to actual demand, reflecting layer 30 and screen is optionally only arranged in backlight module
One of layer 40 is covered in the side of light guide plate.
Fig. 8 A and Fig. 8 B are the explosive view and schematic partial cross-sectional view of the backlight module of another embodiment of the present invention, in another
Embodiment, as shown in Fig. 8 A and Fig. 8 B, when the light leak condition between the keycap of backlight module top is negligible, then backlight module can save
Slightly above-mentioned shielded layer.In other words, backlight module 1 ' shown in Fig. 8 A and Fig. 8 B only includes above-mentioned light guide plate 10, light source unit
20 and reflecting layer 30.Such as the metal base plate trepanning of button module 2 is only corresponded to and is opened in immediately below keycap, and keycap gap location is equal
There is the metal base plate shading of suitable width, can so apply such backlight module 1 '.
In addition, Fig. 9 A and Fig. 9 B are the explosive view and schematic partial cross-sectional view of the backlight module of another embodiment of the present invention,
As shown in Fig. 9 A and Fig. 9 B, if backlight module underneath luminous energy is limited and negligible, backlight module can omit lower section
Reflecting layer.In other words, the backlight module 1 " shown in Fig. 9 A and Fig. 9 B only includes above-mentioned light guide plate 10, light source unit 20 and shielding
Layer 40.Such as it can so be answered when notebook computer mechanism material itself, color and luster have higher reflectivity below backlight module
With backlight module 1 ".Herein it may be noted that in backlight module 1 ', 1 " CONSTRUCTED SPECIFICATION of each component and configuration can refer to correlation above-mentioned
Illustrate, is repeated no more in this.
Furthermore according to practical application, the light guide plate for being applied to backlight module can have different variations.Figure 10 A and Figure 10 B
The respectively light guide plate of another embodiment of the present invention and the stereogram of light source unit and vertical view are such as schemed in another embodiment
Shown in 10A and Figure 10 B, the plate ontology 100 ' of light guide plate 10 ' is the rectangular sheet extended along X-Y axial planes, wherein plate ontology
100 ' incidence surface 101 is preferably the side surface of plate ontology 100, and light-emitting surface 102 is the top surface abutted with incidence surface 101.
Including the light source unit 20 of plural luminescence unit 210 is correspondingly arranged neighbouring incidence surface 101, wherein incidence surface 101 is flat along Y-Z axis
The plane that face extends.In other words, light guide plate 10 ' does not open up above-mentioned using the side surface of its plate ontology 100 ' as incidence surface 101
First light source hole 130.
In other embodiments, light guide plate can corresponding light source unit 20 installation position have different designs.Figure 11 A extremely scheme
Vertical view after 11C is respectively the light guide plate and the forward and backward stereogram of the combination of light source unit of another embodiment of the present invention and combines,
In another embodiment, as shown in figures 11A to 11c, the luminescence component 210 of corresponding light source unit 20, light guide plate 10 " has groove
Structure so that luminescence component 210 may be disposed in corresponding groove 120.Specifically, groove 120 be plate ontology 100 " along Y-Z
The side surface that axial plane extends is formed by notch to X-direction is recessed so that along the side that Y-Z axial planes extend in groove 120
Wall 120a forms incidence surface 101.
Figure 12 is the schematic diagram of the light guide plate of another embodiment of the present invention.As shown in figure 12, light guide plate 10 also includes ink
Layer 140, wherein ink layer 140 is coated on along X-Y axial planes on plate ontology 100, and the tapered section with corresponding opening 110
The shape of 110a (being drops section in the present embodiment) is to surround opening 110.Specifically, ink layer 140 is along basal area
112 and the outer rim of angular extension area 114 be coated on the light-emitting surface 102 of plate ontology 100, to surround opening 110 in light-emitting surface 102
Tapered section 110a so that can be absorbed from opening 110 or its light nearby projected by ink layer 140, to further decrease certainly
Be open 110 light leakage the phenomenon that.
Compared with the prior art, backlight module and its light guide plate of the invention have tapered cut open by light-emitting surface is parallel to
The opening in face designs, and the light for being refracted into opening can be greatly decreased, and fraction is refracted into the light of opening, can be capped
The shielded layer of both sides and reflecting layer absorb or reflect above and below angular extension area, and then improve the light leakage phenomena of opening so that key
The keycap font of disk device has more uniform brightness.
Certainly, the present invention can also have other various embodiments, without deviating from the spirit and substance of the present invention, ripe
Various corresponding change and deformations, but these corresponding change and deformations can be made according to the present invention by knowing those skilled in the art
The protection domain of appended claims of the invention should all be belonged to.
Claims (10)
1. a kind of backlight module, which is characterized in that the backlight module includes：
Light source unit, to provide light；
Light guide plate, to receive the light, which includes：
Plate ontology extends along X-Y axial planes, and the normal direction of the X-Y axial planes is Z-direction, which has into light
Face after the light enters the light guide plate via the incidence surface, is advanced along the X-Y axial planes；And
At least one opening, is formed in the plate ontology, which extends in along the Z-direction in the plate ontology, and the opening is at this
It includes basal area and angular extension area to have tapered section, the tapered section on X-Y axial planes, and the angular extension area is from the substrate
The angular extension in the one end in area and compared with the basal area close to the light source unit；And
First optical layer is set to the side of the light guide plate, first optical layer have through-hole, the angular extension area in this first
The projection of optical layer makes the first optics layer segment be covered in above the angular extension area at least partially in the outside of the through-hole；
Wherein, the part light enters across the tapered section in the opening, which advances from the angular extension area
Decayed by first optical layer during to the basal area, using reduces the intensity that the light projects upwards from the basal area,
And the through-hole with the basal area to being just connected to, to allow radiating airflow or external fixation device to pass through the through-hole and the basal area.
2. backlight module as described in claim 1, which is characterized in that it is 30 degree that the angular extension area, which has apex angle, the apex angle,
To 45 degree.
3. backlight module as claimed in claim 2, which is characterized in that the basal area has basal area central point, the basal area
Central point and the wire definition at the midpoint of the incidence surface are light leakage path, which has apex angle center line, the apex angle
Center line and the angle in the light leakage path are less than 90 degree.
4. backlight module as claimed in claim 3, which is characterized in that the basal area is circular hole, which is should
The wire definition at the center of circle of circular hole, the center of circle and the midpoint of the incidence surface is the light leakage path.
5. backlight module as claimed in claim 4, which is characterized in that the angular extension area includes two bevel edges and an apex angle, is somebody's turn to do
Two bevel edges are two tangent lines of the circular hole, which intersects to form the apex angle.
6. backlight module as claimed in claim 3, which is characterized in that the basal area is elliptical aperture, which is
The wire definition at the elliptical center of the elliptical aperture, the elliptical center and the midpoint of the incidence surface is the light leakage path；Alternatively, the base
Bottom area is smooth vertex polygonal hole, which is the geometric center of the smooth vertex polygonal hole, in the geometry
The heart and the wire definition at the midpoint of the incidence surface are the light leakage path.
7. backlight module as described in claim 1, which is characterized in that the light guide plate also include ink layer, the ink layer along
The X-Y axial planes are coated on the plate ontology, and the ink layer has the shape of the tapered section of the corresponding opening to surround
The opening.
8. backlight module as described in claim 1, which is characterized in that the backlight module also includes the second optical layer, wherein should
Second optical layer is set to the other side of the light guide plate relative to first optical layer, which has another through-hole pair
The just basal area and the through-hole, and the angular extension area in second optical layer projection at least partially in the outer of another through-hole
Side.
9. backlight module as claimed in claim 8, which is characterized in that first optical layer is shielded layer, and second optics
Layer is reflecting layer.
10. backlight module as claimed in claim 9, which is characterized in that the light guide plate also includes first light source hole, the reflecting layer
Also include that second light source hole includes luminescence component to being just connected to the first light source hole, the light source unit, the luminescence component is anti-from this
It penetrates below layer and the first light source hole is stretched by the second light source hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510765541.8A CN105425331B (en) | 2015-09-01 | 2015-11-11 | Backlight module and its light guide plate |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510551738.1A CN105114868A (en) | 2015-09-01 | 2015-09-01 | Backlight module and light guide plate thereof |
| CN2015105517381 | 2015-09-01 | ||
| CN201510765541.8A CN105425331B (en) | 2015-09-01 | 2015-11-11 | Backlight module and its light guide plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105425331A CN105425331A (en) | 2016-03-23 |
| CN105425331B true CN105425331B (en) | 2018-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510551738.1A Pending CN105114868A (en) | 2015-09-01 | 2015-09-01 | Backlight module and light guide plate thereof |
| CN201510765541.8A Active CN105425331B (en) | 2015-09-01 | 2015-11-11 | Backlight module and its light guide plate |
| CN201520895419.8U Expired - Fee Related CN205121004U (en) | 2015-09-01 | 2015-11-11 | Backlight module and light guide plate thereof |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510551738.1A Pending CN105114868A (en) | 2015-09-01 | 2015-09-01 | Backlight module and light guide plate thereof |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520895419.8U Expired - Fee Related CN205121004U (en) | 2015-09-01 | 2015-11-11 | Backlight module and light guide plate thereof |
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| Country | Link |
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| CN (3) | CN105114868A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105114868A (en) * | 2015-09-01 | 2015-12-02 | 苏州达方电子有限公司 | Backlight module and light guide plate thereof |
| TWM531646U (en) * | 2016-07-20 | 2016-11-01 | Xinyongfong Technology Corp | Keyboard backlit device of portable computer |
| CN110242937B (en) * | 2018-03-09 | 2022-04-15 | 松下知识产权经营株式会社 | Light guide assembly and lighting device using same |
| CN114078644A (en) * | 2020-08-18 | 2022-02-22 | 淮安达方电子有限公司 | Luminous key structure |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2745289Y (en) * | 2004-11-04 | 2005-12-07 | 深圳富泰宏精密工业有限公司 | Light guide panel for handset keys |
| CN101109833A (en) * | 2006-07-18 | 2008-01-23 | 林泰言 | Light guiding plate |
| TWM325684U (en) * | 2006-10-27 | 2008-01-11 | Lite On Technology Corp | Light-guide plate for pushbutton |
| CN201166312Y (en) * | 2008-01-21 | 2008-12-17 | 达方电子股份有限公司 | Backlight device and input device using the same |
| CN201417429Y (en) * | 2009-03-30 | 2010-03-03 | 苏州达方电子有限公司 | Illumination keyboard |
| CN103293590B (en) * | 2013-05-22 | 2015-11-18 | 苏州达方电子有限公司 | Light guide plate |
| CN203910618U (en) * | 2014-04-04 | 2014-10-29 | 群光电能科技股份有限公司 | Light leakproof microstructure applied to broken hole of keyboard backlight module |
| CN203839257U (en) * | 2014-04-09 | 2014-09-17 | 群光电能科技股份有限公司 | Flexible circuit board applied to keyboard backlight module |
| CN203983105U (en) * | 2014-06-16 | 2014-12-03 | 群光电能科技股份有限公司 | The anti-side leakage structure of keyboard back light module |
| CN105114868A (en) * | 2015-09-01 | 2015-12-02 | 苏州达方电子有限公司 | Backlight module and light guide plate thereof |
-
2015
- 2015-09-01 CN CN201510551738.1A patent/CN105114868A/en active Pending
- 2015-11-11 CN CN201510765541.8A patent/CN105425331B/en active Active
- 2015-11-11 CN CN201520895419.8U patent/CN205121004U/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN105114868A (en) | 2015-12-02 |
| CN105425331A (en) | 2016-03-23 |
| CN205121004U (en) | 2016-03-30 |
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