CN105114868A - Backlight module and light guide plate thereof - Google Patents
Backlight module and light guide plate thereof Download PDFInfo
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- CN105114868A CN105114868A CN201510551738.1A CN201510551738A CN105114868A CN 105114868 A CN105114868 A CN 105114868A CN 201510551738 A CN201510551738 A CN 201510551738A CN 105114868 A CN105114868 A CN 105114868A
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- Prior art keywords
- light
- guide plate
- hole
- light guide
- light source
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Classifications
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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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- 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
- 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
The invention relates to a backlight module and a light guide plate thereof. The backlight module comprises a light source unit, a light guide plate and an optical layer arranged on one side of the light guide plate. The light guide plate comprises a plate body provided with a light inlet face and at least one opening formed in the plate body. The plate body extends along the X-Y-axis plane, and a Z axis exists in the normal direction of the X-Y-axis plane. Light enters the light guide plate through the light inlet face and then moves forwards along the X-Y-axis plane. The opening extends into the plate body or even penetrates through the plate body along the Z-axis, and the projection of the opening on the X-Y-axis plane is a gradually-shrunk profile. The gradually-shrunk profile comprises a base area and an angular extending area. The angular extending area extends from the one end of the base area in an angular shape and is closer to the light source unit than the base area. The optical layer is provided with a through hole opposite to the base area, and at least part of the projection of the angular extending area on the optical layer is located outside the through hole. According to the backlight module and the light guide plate thereof, by means of the design of the opening which is parallel to a light outlet face and provided with the gradually-shrunk profile, the light leakage phenomenon of the opening can be relieved, and the brightness of a keyboard is more even.
Description
Technical field
The present invention relates to a kind of backlight module and light guide plate thereof, particularly relate to and be a kind ofly applicable to notebook computer keyboard and backlight module and the light guide plate thereof of opening part light leak can be reduced.
Background technology
Along with the evolution of technology and the lifting of mobile computer specification, illuminated keyboard becomes the main flow input unit of mobile computer gradually.Illuminated keyboard is made up of the button module of top and the backlight module of below usually, and backlight module size is close to button module size; Backlight module like this can stackedly extend in below whole button module, allows the luminosity of whole illuminated keyboard zones of different keep evenly.
But in order to (1) makes air can more swimmingly above backlight module flowing underneath to backlight module, backlight module is avoided to hinder mobile computer thermal source (such as: microprocessor, south north bridge chipset, display speed-up chip) heat radiation, (2) through a plurality of screws running through backlight module, whole illuminated keyboard is locked in mobile computer mechanism, or the design of (3) matching mechanism, need in backlight module to form some recessed openings; Therefore backlight module of the prior art need offer that a plurality of heat radiation runs through holes, screw runs through holes or recessed openings usually.But, as illustrated in figures ia and ib, the heat radiation holes of the backlight module 1000 of prior art or screw holes 1010 are the stacked circular hole 1001 ~ 1003 aligned, cause more light can enter in columniform holes 1010, so from the light that cylindrical holes 1010 scatters and disappears, keycap font brightness directly over holes 1010 or neighbouring will be caused far above other font, and make the button of whole keyboard have uneven luminosity.
Therefore, how effectively improving the light leakage phenomena running through holes or recessed openings, is one of the emphasis of research and development.
Summary of the invention
The invention provides a kind of backlight module and light guide plate thereof, to improve the above-mentioned light leakage phenomena running through holes or recessed openings.
The invention provides a kind of light guide plate, in order to receive the light of light source cell, this light guide plate comprises:
Plate body, extend along X-Y axial plane, the normal direction of this X-Y axial plane is Z-direction, and this plate body has incidence surface, after this light enters this light guide plate via this incidence surface, advances along this X-Y axial plane; And
At least one opening, be formed at this plate body, this opening extends in this plate body along this Z-direction, this opening has convergent section on this X-Y axial plane, this convergent section comprises basal area and dihedral extension area, this dihedral extension area from one end dihedral of this basal area extend and comparatively this basal area close to this incidence surface.
As optional technical scheme, this dihedral extension area has drift angle, and this drift angle is 30 degree to 45 degree.
As optional technical scheme, this basal area has basal area central point, the line of the mid point of this basal area central point and this incidence surface is defined as light leak path, and this dihedral extension area has drift angle center line, and the angle in this drift angle center line and this light leak path is less than 90 degree.
As optional technical scheme, this basal area is circular hole, and this basal area central point is the center of circle of this circular hole, and the line of the mid point of this center of circle and this incidence surface is defined as this light leak path.
As optional technical scheme, this dihedral extension area comprises two hypotenuses and a drift angle, and this two hypotenuse is two tangent lines of this circular hole, and this two tangent lines intersection forms this drift angle.
As optional technical scheme, this basal area is elliptical aperture, and this basal area central point is the elliptical center of this elliptical aperture, and the line of the mid point of this elliptical center and this incidence surface is defined as this light leak path; Or this basal area is level and smooth summit polygonal hole, this basal area central point is the geometric center of this level and smooth summit polygonal hole, and the line of the mid point of this geometric center and this incidence surface is defined as this light leak path.
As optional technical scheme, this light guide plate also comprises ink layer, and this ink layer is coated on this plate body along this X-Y axial plane, and this ink layer have to should the shape of this convergent section of opening with around this opening.
As optional technical scheme, this light guide plate also comprises light source hole, and this light source hole is formed at this plate body for this light source cell accommodating, and this incidence surface is the sidewall of this plate body in this light source hole.
The present invention also provides a kind of backlight module, and this backlight module comprises:
Light source cell, in order to provide light;
As the light guide plate in claim 1-8 as described in any one; And
First optical layers, is arranged at the side of this light guide plate, and this first optical layers has the first through hole and aligns this basal area, and this dihedral extension area in the projection of this first optical layers at least partially in the outside of this first through hole.
As optional technical scheme, this backlight module also comprises the second optical layers, wherein this second optical layers is arranged at the opposite side of this light guide plate relative to this first optical layers, this second optical layers has the second through hole and aligns this basal area and this first through hole, and this dihedral extension area in the projection of this second optical layers at least partially in the outside of this second through hole.
As optional technical scheme, this first optical layers is one of them of reflecting layer and screen layer, and this second optical layers is wherein another of this reflecting layer and this screen layer.
As optional technical scheme, this light guide plate also comprises the first light source hole, this first optical layers also comprises secondary light source hole and aligns this first light source hole of connection, and this light source cell comprises luminescence component, and this luminescence component stretches into this first light source hole by this secondary light source hole below this first optical layers.
As optional technical scheme, this opening runs through this plate body along this Z-direction, and this first through hole aligns with this basal area and is communicated with, and makes external fixation device to pass this first through hole and this basal area.
Compared to existing technology, backlight module of the present invention and light guide plate thereof, by be parallel to exiting surface have convergent section opening design, significantly can reduce the light that refraction enters opening, and fraction refraction enters the light of opening, screen layer and the reflecting layer that can be capped on the upper and lower both sides of dihedral extension area absorb or reflect, and then improve the light leakage phenomena of opening, make the keycap font of key board unit have more uniform brightness.
Accompanying drawing explanation
Figure 1A and Figure 1B is respectively the schematic cross-section and schematic side view that in the backlight module of prior art, light is advanced;
Fig. 2 is the schematic diagram forming illuminated keyboard after the backlight module of application one embodiment of the invention is combined with button module;
Fig. 3 A and Fig. 3 B is explosive view and the schematic partial cross-sectional view of the backlight module of one embodiment of the invention;
Fig. 3 C is the schematic cross-section of the opening of one embodiment of the invention;
Fig. 4 A to Fig. 4 C is the schematic cross-section of the opening of other embodiment of the present invention;
Fig. 5 A to Fig. 5 C is the configuration schematic diagram of the opening of different embodiments of the invention;
Fig. 6 A to Fig. 6 C is the configuration schematic diagram of the first light source hole of the light guide plate of different embodiments of the invention;
Fig. 7 A and Fig. 7 B is respectively the schematic cross-section and schematic side view that in the backlight module of one embodiment of the invention, light is advanced;
Fig. 8 A and Fig. 8 B is explosive view and the schematic partial cross-sectional view of the backlight module of another embodiment of the present invention;
Fig. 9 A and Fig. 9 B is explosive view and the schematic partial cross-sectional view of the backlight module of another embodiment of the present invention;
Figure 10 A and Figure 10 B is respectively the light guide plate of another embodiment of the present invention and the stereogram of light source cell and top view;
Figure 11 A to Figure 11 C is respectively the light guide plate of another embodiment of the present invention and the forward and backward stereogram of combination of light source cell and combines rear top view;
Figure 12 is the schematic diagram of the light guide plate of another embodiment of the present invention.
Detailed description of the invention
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Backlight module of the present invention can be applicable to such as illuminated keyboard, especially the illuminated keyboard of mobile computer is applied to, it comprises the light guide plate of horizontal gradually-reducing shape opening design, to reduce the light leakage phenomena of heat radiation holes, screw holes or recessed openings, and then make keycap font have uniform brightness performance, but not as limit.
Fig. 2 is the schematic diagram forming illuminated keyboard after the backlight module of application one embodiment of the invention is combined with button module, refer to Fig. 2, illuminated keyboard comprises backlight module 1 of the present invention and button module 2, wherein backlight module 1 to be arranged at below button module 2 and to have a plurality of heat radiation holes, screw holes or recessed openings 11, and button module 2 comprises a plurality of button 22 and can be any suitable button module with light-permeable keycap.In the present embodiment, the setting position of heat radiation holes, screw holes or recessed openings 11 and number according to the heat radiation of applied electronic installation (such as mobile computer) and configuration needs change, can not be limited with shown in embodiment.For example, heat radiation holes 11, at the thermal source place more close to mobile computer, generally can have the configuration of comparatively dense.
Fig. 3 A and Fig. 3 B is explosive view and the schematic partial cross-sectional view of the backlight module of one embodiment of the invention, as shown in Fig. 3 A and Fig. 3 B, backlight module 1 comprises light guide plate 10, light source cell 20, reflecting layer 30 and screen layer 40, and wherein light source cell 20 is in order to provide light to light guide plate 10; Reflecting layer 30 is arranged at the side (such as below) of light guide plate 10 and screen layer 40 is arranged at the opposite side (such as top) of light guide plate 10 relative to reflecting layer 30.Specifically, light source cell 20 preferably comprises a plurality of luminescence component 210 and circuit board 220, wherein luminescence component 210 can be light emitting diode (LED), especially the light emitting diode of side luminescence is preferably, 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 cell 20 that a plurality of luminescence component 210 integrates by circuit board 220, to promote packaging efficiency.
Light guide plate 10 can in order to be received from the light of light source cell 20, and wherein light guide plate 10 comprises plate body 100 and is formed at least one opening 110 of plate body 100.Plate body 100 for the plate be made up of any suitable optical material (such as optic polymer), and can extend along X-Y axial plane, and the normal direction of X-Y axial plane is Z-direction.In the present embodiment, Z-direction is the thickness direction of plate body 100, and plate body 100 in the size of X, Y direction preferably much larger than the size in Z-direction, make plate body 100 for thin plate or sheet form.Plate body 100 is rectangular panel body, the size of its size preferably corresponding button module 2.The incidence surface 101 that plate body 100 has parallel Y-Z axial plane and the exiting surface 102 extended along X-Y axial plane.The light that light source cell 20 provides is advanced along X-Y axial plane, and is penetrated from exiting surface 102 after entering light guide plate 10 via incidence surface 101.Specifically, after the light that the luminescence component 210 of light source cell 20 provides enters light guide plate 10 via incidence surface 101, advance along X-Y axial plane, and penetrate from exiting surface 102.
At least one opening 110 is formed at plate body 100, wherein in one embodiment, opening 110 extends in plate body 100 along Z axis and forms recessed openings (i.e. blind hole), or in another embodiment, as shown in Figure 3 B, opening 110 along Z axis extend through plate body 100 and formed run through holes.Fig. 3 C is the schematic cross-section of the opening of one embodiment of the invention, as shown in Figure 3 C, opening 110 has convergent section 110a on X-Y axial plane, wherein convergent section 110a comprises basal area 112 and dihedral extension area 114, dihedral extension area 114 from one end dihedral of basal area 112 extend and comparatively basal area 112 close to light source cell 20.Specifically, opening 110 can be the opening that on the X-Y axial plane of plate body 100 machining is formed or the opening formed by die casting, and opening 110 be set to convergent section 110a dihedral extension area 114 than basal area 112 closer to incidence surface 101.In other words, on the exiting surface 102 of parallel X-Y plane, opening 110 has convergent section 110a; This convergent section 110a has larger width in the basal area 112 away from incidence surface 101, then reduces gradually from one end of basal area 112, and makes the dihedral extension area 114 close to incidence surface 101 have similar leg-of-mutton section shape.In this embodiment, the basal area 112 of convergent section 110a is preferably the circular hole with positive toroidal, and dihedral extension area 114 comprises two hypotenuse 114a, 114b and drift angle 114c, wherein two hypotenuse 114a, 114b straight lines in the same way relative tilt to extend and intersection forms drift angle 114c.That is when basal area 112 is circular hole, two hypotenuse 114a, 114b are preferably two tangent lines of circle hole shape basal area 112, and two tangent line intersections and form drift angle 114c, make convergent section 110a be preferably drops section, but not as limit.
Fig. 4 A to Fig. 4 C is the schematic cross-section of the opening of other embodiment of the present invention, as shown in Fig. 4 A to Fig. 4 C, in other embodiments, according to actual demand, the basal area 112 of convergent section 110a can have the level and smooth geometry in other summit (such as ellipse, rectangle, hexagon etc.), and makes convergent section 110a be the convergent section with anon-normal circular-base district.The summit of this geometry is preferably smoothed curve, that is avoid the edge of opening of basal area 112 to occur the included angle of straight line be made up of two straightway intersections, light guide plate so can be avoided in the optically focused effect at edge of opening included angle of straight line place, cause edge line angle backlight bright especially.In addition, Fig. 3 C and the dihedral extension area 114 shown in Fig. 4 A ~ 4C preferably have two equal hypotenuse 114a, 114b of length, but not as limit.In other embodiments, according to actual demand, two hypotenuse 114a, 114b of dihedral extension area 114 also can have different length.
The angle θ of drift angle 114c is preferably 30 degree to 45 degree, to make to enter from incidence surface 101 and the light of advancing along X-direction can reflect when meeting two hypotenuse 114a, the 114b being formed drift angle 114c, the light entering opening 110 is significantly reduced, and then the light leakage phenomena that reduction light penetrates from opening 110.Should be noted at this, drift angle 114c can be the crossing wedge angle drift angle of two hypotenuse 114a, 114b or arc drift angle, but is preferably arc drift angle.When drift angle 114c is arc drift angle, two hypotenuse 114a, 114b that the scope of the angle θ of drift angle 114c is arc drift angle extend the angular range folded by intersection.In addition, the setting position of opening 110 and number according to the heat radiation of applied electronic installation and configuration needs change, can not be limited with shown in embodiment.For example, opening 110, at the thermal source place more close to mobile computer, generally can have the configuration of comparatively dense.
Fig. 5 A to Fig. 5 C is the configuration schematic diagram of the opening of different embodiments of the invention, as shown in Figure 5A, basal area 112 has basal area central point 112a, and the line of the mid point M of basal area central point 112a and incidence surface 101 is defined as light leak 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 line of the mid point M of center of circle 112a and incidence surface 101 is defined as light leak path (such as P1 ~ P3).When basal area 112 is other suitable shape (as shown in figs. 4 a-4 c), basal area central point 112a is the geometric center of basal area 112 shape, and the line of the geometric center 112a of basal area 112 shape and the mid point M of incidence surface 101 also definable go out light leak path.For example, as shown in Figure 4 A, basal area 112 is elliptical aperture, and basal area central point 112a is the elliptical center of this elliptical aperture, and the line of the mid point M of elliptical center 112a and incidence surface d defines light leak path; As shown in Fig. 4 B ~ 4C, basal area 112 is level and smooth summit polygonal hole (such as rectangular opening, hex hole), basal area central point 112a is the geometric center of level and smooth summit polygonal hole, and the line of the mid point of geometric center 112a and incidence surface 101 defines light leak path.
Dihedral extension area 114 has drift angle center line (such as CL1 ~ CL3), and wherein the angle (such as θ 1, θ 2) in drift angle center line and light leak path is preferably less than 90 degree.In other words, dihedral extension area 114 comparatively basal area 112 comparatively close to incidence surface 101, and dihedral extension area 114 can relative to the normal direction of incidence surface 101 (X-direction) tilt or parallel.For example, as shown in Figure 5A, three openings 110,110 ', 110 " corresponding incidence surface 101 arranges, its split shed 110 is just arranged the mid point M of incidence surface 101, and opening 110 ', 110 " be arranged at the both sides of opening 110 respectively.In the present embodiment, opening 110 ', 110,110 " drift angle centre line C L 1 ~ CL3 be parallel to the normal direction (X-direction) of incidence surface 101; the drift angle centre line C L 2 of its split shed 110 overlaps with light leak path P 2 (namely the drift angle of its dihedral extension area 114 refers to the mid point M of phototropic face 101; and drift angle centre line C L 2 is zero degree with the angle of light leak path P 2), drift angle centre line C L 2 being extended can the mid point M of intersection incidence surface 101.Opening 110 ', 110 " drift angle centre line C L 1, CL3 be less than 90 degree with the angle of light leak path P 1, P2 respectively.
In another embodiment, as shown in Figure 5 B, three openings 110,110 ', 110 " corresponding incidence surface 101 arranges, its split shed 110 is just arranged the mid point M of incidence surface 101, and opening 110 ', 110 " be arranged at the both sides of opening 110 respectively.In the present embodiment, the drift angle centre line C L 2 of opening 110 is parallel to the normal direction (X-direction) of incidence surface 101, and opening 110 ', 110 " drift angle centre line C L 1, CL3 tilt relative to the normal direction (X-direction) of incidence surface 101 respectively, make opening 110 ', 110,110 " drift angle centre line C L 1 ~ CL3 preferably all point to the mid point M of incidence surface 101.That is, opening 110 ', 110,110 " drift angle centre line C L 1 ~ CL3 overlap with light leak path P 1 ~ P3 respectively, being extended by drift angle centre line C L 1 ~ CL3 can the mid point M of intersection incidence surface 101.In other words, when opening 110 ', 110 " forward is set when corresponding to the mid point M position of incidence surface 101; opening 110 ', 110 " can be obliquely installed relative to the normal direction of incidence surface 101 (X-direction), make opening 110 ', 110 " the drift angle of dihedral extension area 114 preferably all towards the mid point M position of incidence surface 101.
Though the mid point M that the embodiment of Fig. 5 A and Fig. 5 B illustrates incidence surface 101 be plate body 100 along the mid point of side in Y-axis that Y-Z axial plane extends, not as limit.In other embodiments, as shown in Figure 5 C, different opening also definable has the mid point of different incidence surfaces 101, such as: (1) is for opening 110 ', the mid point M1 of incidence surface 101 can be that " the light-emitting area mid point of luminescent module 210' extends light-emitting area normal, the position of this light-emitting area normal and incidence surface 101 intersection ", (2) for opening 110, the mid point M2 of incidence surface 101 can be that " the light-emitting area mid point of luminescent module 210 extends light-emitting area normal, the position of this light-emitting area normal and incidence surface 101 intersection ", (3) for opening 110 ", the light-emitting area mid point that the mid point M3 of incidence surface 101 can be " luminescent module 210 " extends light-emitting area normal, the position of this light-emitting area normal and incidence surface 101 intersection ", plural opening 110 ', 110,110 can be made by this " with the most contiguous highlighting luminescence component 210 ', 210,210 " the mid point M1 ~ M3 of corresponding incidence surface 101 defines light leak path P 1 ~ P3 respectively, and then make each opening 110 ', 110,110 " drift angle centre line C L 1 ~ CL3 be less than 90 degree (in the present embodiment, angle is zero degree) with the angle of corresponding light leak path P 1 ~ P3 respectively.
Moreover in one embodiment, as shown in Fig. 3 A and Fig. 3 B, light guide plate 10 is formed with a plurality of first light source hole 130 near middle section position, and a plurality of luminescence components 210 of light source cell 20.These luminescence components 210 do corresponding arrangement, and can be placed in a plurality of first light source hole 130 respectively, and incidence surface 101 like this is the sidewall that plate body 100 is parallel to Y-Z axial plane in the first light source hole 130.Specifically, plural number the first light source hole 130 runs through plate body 100 along Z axis and plate body 100 is distinguished left side and right-hand part along Y direction arrangement, and above-mentioned plural opening 110 is distributed in the left and right halves of the plate body 100 of the first light source hole 130 both sides.In the present embodiment, 14 the first light source holes 130 along X-axis and Y direction with the centre of configured in array mode in light guide plate 10, wherein be configured to two row (such as left column X1, right row X2) along X-axis, and respectively arrange X1, X2 along Y-axis there are 7 light source holes 130 respectively.A plurality of luminescence component (such as 14) is arranged in the first corresponding light source hole 130 respectively, the light guide plate 10 providing light to enter both sides respectively with the incidence surface 101 in corresponding first light source hole 130.In the present embodiment, the 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 wall of rectangular opening, and the incidence surface 101 of the light source hole 130 of right row X2 is the right side wall of rectangular opening.Specifically, each first light source hole 130 preferably correspondence arranges a luminescence component 210, the left side wall of luminescence component 210 as incidence surface 101 in light source hole 130 being arranged at left column X1 is made to provide light, and the luminescence component 210 being arranged at right row X2 provides light as the right side wall of incidence surface 101 in light source hole 130, and then the light making plural luminescence component 210 provide enters the plate body 100 of first light source hole 130 left and right sides respectively, and after light enters light guide plate 10 via incidence surface 101, the X-Y axial plane along both sides is advanced.
In addition, though plural first light source hole 130 of illustrating in Fig. 3 A is configured to symmetrical left and right two arrange X1, X2, not as limit.Fig. 6 A to Fig. 6 C is the configuration schematic diagram of the first light source hole of the light guide plate of different embodiments of the invention, in other embodiments, as shown in Figure 6A, plural number the first light source hole 130 can be configured to asymmetric left and right two and arranges X1 ', X2 ', and first light source hole 130 number of two row X1 ', X2 ' may be the same or different.In other embodiments, plural first light source hole 130 ' can be configured to only row X3 (as shown in Figure 6B), and the part luminescence component in plural first light source hole 130 ' irradiates left, and part luminescence component irradiates to the right; Or even plural light source hole is integrated into only first light source hole 130 " (as shown in Figure 6 C); and the first light source hole 130 ', 130 " larger size can be had, with in the first light source hole 130 ', 130 " in wear plural luminescence component 210, and reach the effect of irradiating towards plate body 100 left and right sides.In other words, utilize the first light source hole 130 ', 130 " accommodating luminescence component 210 time, the first light source hole 130 ', 130 " relative two side (left side wall and right side wall) is respectively as the incidence surface 101 of left side and right-hand part plate body.
As shown in Fig. 3 A and Fig. 3 B, reflecting layer 30 is arranged at below light guide plate 10, in order to the light spilt from light guide plate 10 lower surface is reflected back into light guide plate 10.Specifically, the luminous energy scattered and disappeared from plate body 100 lower surface can be reflected in the reflecting layer 30 be arranged at below plate body 100, and the luminous energy that lower surface is scattered and disappeared comes back in plate body 100, continues after a while to advance along X-Y axial plane, or penetrates from exiting surface 102.Reflecting layer 30 can be on reflection diaphragm (such as tinsel) or non-reflective diaphragm that reflecting material formed and is coated with the reflecting layer that reflecting material formed.The shape in reflecting layer 30, size preferably respective panels body 100.Reflecting layer 30 has the first through hole 310 and aligns basal area 112 (such as circular hole), and the projection of dihedral extension area 114 on reflecting layer 30 is at least partially in the outside of the first through hole 310.Specifically, the heat radiation holes of the better corresponding key board unit of the first through hole 310 in reflecting layer 30 or screw holes, the opening 110 of the corresponding light guide plate 10 of the number of the first through hole 310 and position, and the shape of the first through hole 310 is preferably hole shape.In one embodiment, for the basal area 112 (i.e. circular hole) of hole shape, when light guide plate 10 and reflecting layer 30 stacked time, the center of circle that the first through hole 310 is preferably aimed in the center of circle as the circular hole of basal area 112 aligns to make basal area 112 and the first through hole 310, and the radius of basal area 112 preferably essence be more than or equal to the radius of the first through hole 310.When the basal area 112 of opening 110 is other geometry, the center of circle as geometric center preferred alignment first through hole 310 of the geometry of basal area 112 aligns to make basal area 112 and the first through hole 310.Moreover the projection of basal area 112 on reflecting layer 30 of opening 110 preferably can contain the first through hole 30, and dihedral extension area 114 exceeds the first through hole 310 at least partly, and reflecting layer 30 is made to hide the dihedral extension area 114 exceeding the first through hole 310.
In addition, reflecting layer 30 also comprises secondary light source hole 320, and wherein secondary light source hole 320 aligns and is communicated with the first corresponding light source hole 130.That is in the present embodiment, secondary light source hole 320 preferably has the number identical with the first light source hole 130, shape and configuration, and has connected relation one to one, but not as limit.In other embodiments, secondary light source hole 320 can have different numbers, size and shape from the first light source hole 130, as long as when light guide plate 10 is stacked with reflecting layer 30, the part that the first light source hole 130 and secondary light source hole 320 are communicated with can supply accommodating plural luminescence component 210.As shown in Figure 3 B, when light guide plate 10, reflecting layer 30 and light source cell 20 combine, the opening 110 of light guide plate 10 aligns with first through hole 310 in reflecting layer 30, make the luminescence component 210 of light source cell 20 can stretch into the first light source hole 130 by secondary light source hole 320 below self-reflection layer 30, and the basal area 112 of opening 110 aligns the first through hole 310, make the dihedral extension area 114 of at least cover part, reflecting layer 30.
In addition, screen layer 40 is arranged at above light guide plate 10, and has light-shielding pattern and stop light or allow light pass through with selective local.Specifically, screen layer 40 is the blooming piece of light-permeable and diaphragm has design, does not need the part of light in order to cover corresponding key board unit.For example, screen layer 40 can have the pattern of the configuration of corresponding plural button, makes the space conductively-closed between adjacent key firmly not allow light pass through, and the position tolerable light of corresponding plural button passes through to make light can penetrate from keycap.In one embodiment, shape, the size preferably respective panels body 100 of screen layer 40.Moreover screen layer 40 has the second through hole 410 and aligns the basal area 112 of the opening 110 of light guide plate 10 and first through hole 310 in reflecting layer 30, and the projection of the dihedral extension area 114 of opening 110 on screen layer 40 is at least partially in the outside of the second through hole 410.
First through hole 310 in the number of the second through hole 410 of screen layer 40, position and the better corresponding reflecting layer 30 of shape, that is the second through hole 410 is preferably the circular hole identical with the first through hole 310 radius.As shown in Figure 3 B, when screen layer 40, light guide plate 10, reflecting layer 30 and light source cell 20 are combined into backlight module 1, the center of circle of the first through hole 310 and the second through hole 410 is preferably aimed in the center of circle (or geometric center of other geometry) as the circular hole of basal area 112, and the radius of basal area 112 preferably essence be more than or equal to the radius of the first through hole 310 and the second through hole 410.Moreover, the basal area 112 of opening 110 contains the first through hole 310 and the second through hole 410 respectively in the projection of reflecting layer 30 and screen layer 40, and dihedral extension area 114 exceeds the first through hole 310 and the second through hole 410 at least partly, and screen layer 40 and reflecting layer 30 is made to be covered in top and the below of dihedral extension area 114 respectively at least partly.Stretch into the first light source hole 130 by secondary light source hole 320 below the luminescence component 210 self-reflection layer 30 of light source cell 20, and screen layer 40 is covered in above luminescence component 210.In addition, when opening 110 is holes form, and screen layer 40, light guide plate 10, reflecting layer 30 and light source cell 20 are when being combined into backlight module 1, the basal area 112 of the first through hole 310, opening 110 and the second through hole 410 align to be communicated with and form through hole, make external fixation device (such as plug, screw etc.) can pass the first through hole 310, basal area 112 and the second through hole 410 with fixing backlight module 1.
Fig. 7 A and Fig. 7 B is respectively the schematic cross-section and schematic side view that in the backlight module of one embodiment of the invention, light is advanced, as shown in figs. 7 a and 7b, by the design of the convergent section 110a of opening 110, to enter from incidence surface 101 and the light of advancing along X-direction can reflect when meeting two hypotenuse 114a, the 114b forming dihedral extension area 114, the light entering opening 110 is significantly reduced, and then the light leak that reduction light penetrates from opening 110.In addition, be holes form for opening 110, top and the below of at least part of dihedral extension area 114 is covered in by screen layer 40 and reflecting layer 30, allow light leak multiple attenuation in the space that both screen layer 40 and reflecting layer 30 are coated, the possibility that light penetrates from dihedral extension area 114 can be reduced further.
Reflecting layer 30 and screen layer 40 are for being arranged at the first optical layers and second optical layers of the relative both sides of light guide plate 10, wherein the first optical layers can be one of them of reflecting layer 30 and screen layer 40, and the second optical layers can be wherein another of reflecting layer 30 and screen layer 40.Namely, when the first optical layers is reflecting layer 30, the second optical layers is then screen layer 40, or when the first optical layers is screen layer 40, the second optical layers is reflecting layer 30.Though illustrate light guide plate 10 both sides in the above-described embodiments to arrange reflecting layer 30 and screen layer 40 respectively, but according to actual demand, backlight module reflecting layer 30 and screen layer 40 be optionally only set one of them in the side of light guide plate.
Fig. 8 A and Fig. 8 B is explosive view and the 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 above backlight module between keycap can be ignored, then backlight module can omit above-mentioned screen layer.In other words, Fig. 8 A and the backlight module shown in Fig. 8 B 1 ' only comprise above-mentioned light guide plate 10, light source cell 20 and reflecting layer 30.The metal base plate perforate of such as button module 2 only correspondence is opened in immediately below keycap, and keycap gap location all has the metal base plate shading of suitable width, so can apply this type of backlight module 1 '.
In addition, Fig. 9 A and Fig. 9 B is explosive view and the 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 limited and can ignore time, then backlight module can omit below reflecting layer.In other words, Fig. 9 A and Fig. 9 B shownschematically backlight module 1 " only comprise above-mentioned light guide plate 10, light source cell 20 and screen layer 40.When such as, below the backlight module material of mobile computer mechanism own, color and luster have a higher reflectivity, so can apply backlight module 1 ".Should be noted at this, backlight module 1 ', 1 " in each assembly CONSTRUCTED SPECIFICATION and configuration with reference to aforesaid related description, can repeat no more in this.
Moreover according to practical application, the light guide plate being applied to backlight module can have different changes.Figure 10 A and Figure 10 B is respectively the light guide plate of another embodiment of the present invention and the stereogram of light source cell and top view, in another embodiment, as shown in Figure 10 A and Figure 10 B, the plate body 100 ' of light guide plate 10 ' is the rectangle lamellar body extended along X-Y axial plane, wherein the incidence surface 101 of plate body 100 ' is preferably the side surface of plate body 100, and exiting surface 102 is the top surface adjacent with incidence surface 101.Light source cell 20 correspondence comprising plural luminescence unit 210 arranges contiguous incidence surface 101, and wherein incidence surface 101 is the plane extended along Y-Z axial plane.In other words, light guide plate 10 ', using the side surface of its plate body 100 ' as incidence surface 101, does not offer the first above-mentioned light source hole 130.
In other embodiments, the setting position that light guide plate may correspond to light source cell 20 has different designs.Figure 11 A to Figure 11 C is respectively the light guide plate of another embodiment of the present invention and the forward and backward stereogram of combination of light source cell and combines rear top view, in another embodiment, as shown in Figure 11 A to Figure 11 C, the luminescence component 210 of corresponding light source unit 20, light guide plate 10 " there is groove structure, luminescence component 210 can be arranged in corresponding groove 120.Specifically, groove 120 is plate body 100 " along Y-Z axial plane extend side surface be recessed into formed breach to X-direction, make in groove 120 along Y-Z axial plane extend sidewall 120a formed 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 comprises ink layer 140, wherein ink layer 140 is coated on plate body 100 along X-Y axial plane, and the shape with the convergent section 110a (in the present embodiment for drops section) of corresponding opening 110 is with around opening 110.Specifically, ink layer 140 coats the exiting surface 102 of plate body 100 along the outer rim of basal area 112 and dihedral extension area 114, with around the convergent section 110a of opening 110 in exiting surface 102, make to be absorbed by ink layer 140 from opening 110 or the light that penetrates near it, to reduce the phenomenon from opening 110 light leak further.
Compared to prior art, backlight module of the present invention and light guide plate thereof, by be parallel to exiting surface have convergent section opening design, significantly can reduce the light that refraction enters opening, and fraction refraction enters the light of opening, screen layer and the reflecting layer that can be capped on the upper and lower both sides of dihedral extension area absorb or reflect, and then improve the light leakage phenomena of opening, make the keycap font of key board unit have more uniform brightness.
Certainly; the present invention also can have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art can make various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection domain that all should belong to the claim appended by the present invention.
Claims (13)
1. a light guide plate, in order to receive the light of light source cell, is characterized in that, this light guide plate comprises:
Plate body, extend along X-Y axial plane, the normal direction of this X-Y axial plane is Z-direction, and this plate body has incidence surface, after this light enters this light guide plate via this incidence surface, advances along this X-Y axial plane; And
At least one opening, be formed at this plate body, this opening extends in this plate body along this Z-direction, this opening has convergent section on this X-Y axial plane, this convergent section comprises basal area and dihedral extension area, this dihedral extension area from one end dihedral of this basal area extend and comparatively this basal area close to this incidence surface.
2. light guide plate as claimed in claim 1, it is characterized in that, this dihedral extension area has drift angle, and this drift angle is 30 degree to 45 degree.
3. light guide plate as claimed in claim 2, it is characterized in that, this basal area has basal area central point, the line of the mid point of this basal area central point and this incidence surface is defined as light leak path, this dihedral extension area has drift angle center line, and the angle in this drift angle center line and this light leak path is less than 90 degree.
4. light guide plate as claimed in claim 3, it is characterized in that, this basal area is circular hole, and this basal area central point is the center of circle of this circular hole, and the line of the mid point of this center of circle and this incidence surface is defined as this light leak path.
5. light guide plate as claimed in claim 4, it is characterized in that, this dihedral extension area comprises two hypotenuses and a drift angle, and this two hypotenuse is two tangent lines of this circular hole, and this two tangent lines intersection forms this drift angle.
6. light guide plate as claimed in claim 3, it is characterized in that, this basal area is elliptical aperture, and this basal area central point is the elliptical center of this elliptical aperture, and the line of the mid point of this elliptical center and this incidence surface is defined as this light leak path; Or this basal area is level and smooth summit polygonal hole, this basal area central point is the geometric center of this level and smooth summit polygonal hole, and the line of the mid point of this geometric center and this incidence surface is defined as this light leak path.
7. light guide plate as claimed in claim 1, it is characterized in that, this light guide plate also comprises ink layer, and this ink layer is coated on this plate body along this X-Y axial plane, and this ink layer have to should the shape of this convergent section of opening with around this opening.
8. light guide plate as claimed in claim 1, it is characterized in that, this light guide plate also comprises light source hole, and this light source hole is formed at this plate body for this light source cell accommodating, and this incidence surface is the sidewall of this plate body in this light source hole.
9. a backlight module, is characterized in that, this backlight module comprises:
Light source cell, in order to provide light;
As the light guide plate in claim 1-8 as described in any one; And
First optical layers, is arranged at the side of this light guide plate, and this first optical layers has the first through hole and aligns this basal area, and this dihedral extension area in the projection of this first optical layers at least partially in the outside of this first through hole.
10. backlight module as claimed in claim 9, it is characterized in that, this backlight module also comprises the second optical layers, wherein this second optical layers is arranged at the opposite side of this light guide plate relative to this first optical layers, this second optical layers has the second through hole and aligns this basal area and this first through hole, and this dihedral extension area in the projection of this second optical layers at least partially in the outside of this second through hole.
11. backlight modules as claimed in claim 10, is characterized in that, this first optical layers is one of them of reflecting layer and screen layer, and this second optical layers is wherein another of this reflecting layer and this screen layer.
12. backlight modules as claimed in claim 9, it is characterized in that, this light guide plate also comprises the first light source hole, this first optical layers also comprises secondary light source hole and aligns this first light source hole of connection, this light source cell comprises luminescence component, and this luminescence component stretches into this first light source hole by this secondary light source hole below this first optical layers.
13. backlight modules as claimed in claim 9, it is characterized in that, this opening runs through this plate body along this Z-direction, and this first through hole aligns with this basal area and is communicated with, and makes external fixation device to pass this first through hole and this basal area.
Priority Applications (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 |
| CN201510765541.8A CN105425331B (en) | 2015-09-01 | 2015-11-11 | Backlight module and its light guide plate |
| CN201520895419.8U CN205121004U (en) | 2015-09-01 | 2015-11-11 | Backlight module and light guide plate thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510551738.1A CN105114868A (en) | 2015-09-01 | 2015-09-01 | Backlight module and light guide plate thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105114868A true CN105114868A (en) | 2015-12-02 |
Family
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Family Applications (3)
| 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 |
| CN201520895419.8U Expired - Fee Related CN205121004U (en) | 2015-09-01 | 2015-11-11 | 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 |
Family Applications After (2)
| 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 |
| CN201510765541.8A Active CN105425331B (en) | 2015-09-01 | 2015-11-11 | Backlight module and its light guide plate |
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| Country | Link |
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| CN (3) | CN105114868A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107643807A (en) * | 2016-07-20 | 2018-01-30 | 欣永丰科技股份有限公司 | Keyboard backlight device of portable computer |
Families Citing this family (3)
| 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 |
| 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 CN201520895419.8U patent/CN205121004U/en not_active Expired - Fee Related
- 2015-11-11 CN CN201510765541.8A patent/CN105425331B/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107643807A (en) * | 2016-07-20 | 2018-01-30 | 欣永丰科技股份有限公司 | Keyboard backlight device of portable computer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN205121004U (en) | 2016-03-30 |
| CN105425331A (en) | 2016-03-23 |
| CN105425331B (en) | 2018-11-09 |
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Application publication date: 20151202 |