CN104235637B - Area source - Google Patents
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- CN104235637B CN104235637B CN201310243997.9A CN201310243997A CN104235637B CN 104235637 B CN104235637 B CN 104235637B CN 201310243997 A CN201310243997 A CN 201310243997A CN 104235637 B CN104235637 B CN 104235637B
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- light
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- guide plate
- area source
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Abstract
A kind of area source, it includes light guide plate and light supply apparatus.Light guide plate includes plate body and at least one prism portion, plate body has the light incident sides mirrored sides relative with light incident sides, bottom surface and the exiting surface relative with bottom surface, wherein light incident sides is connected with exiting surface with bottom surface respectively with mirrored sides, and the thickness of the height of the height of light incident sides, mirrored sides and plate body is substantially the same.Prism portion is configured on the bottom surface of plate body, wherein prism portion has the first plane adjacent to each other and the second plane, the angle of the first plane and bottom surface is less than the angle of the second plane with bottom surface, and the beeline of the first plane and light incident sides is less than the second plane and the beeline of light incident sides.Light supply apparatus configuration is adjacent to light incident sides.The present invention provides the area source with good light-emitting uniformity.
Description
Technical field
The present invention is about a kind of light source, and especially with regard to a kind of area source (plane light
source)。
Background technology
Owing to liquid crystal display is non-self luminescence type display, it is therefore desirable to backlight module provides institute
The light needed, can realize the function of display.Along with the lifting of environmental consciousness, in backlight module
The light-emitting component used is the most gradually from cathode fluorescent tube (cold cathode fluorescent
Lamp, CCFL) it is converted into the light-emitting diode of more environmental protection.Work as light-emitting diode
When being applied in backlight module, as a example by side incident backlight module, light emitting diode unit
Part is typically to be arranged on the printed circuit board (PCB) of a strip to form light-emitting diode light bar (LED
Light bar), and light-emitting diode light bar would generally pass through pliability circuit (flexible printed
Circuit, FPC) electrically connect with control circuit plate.
Fig. 1 is the schematic top plan view of existing area source, and Fig. 2 is along the I-I ' section in Fig. 1
Cross-sectional schematic.Refer to Fig. 1 and Fig. 2, existing area source 100 includes light guide plate 110
And light supply apparatus 120.Light guide plate 110 has what exiting surface 112 was connected with exiting surface 112
Light incident sides 114 and the bottom surface 116 relative with exiting surface 112, and exiting surface 112 includes
The surrounding zone 112a being connected with light incident sides 114 and effective lighting district 112b.Light guide plate 110
Bottom surface 116 on site 116a is distributed, the distribution density adjustable through site 116a goes out light
The light-emitting uniformity in face 112.It is other that light supply apparatus 120 is configured at light incident sides 114, and light source
Device 120 includes circuit board 122 and multiple light-emitting diode 124, and light-emitting diodes
Tube elements 124 is configured on circuit board 122 and electrically connects with circuit board 122.Light emitting diode
The light beam L that element 124 is sent enters light guide plate 110 from light incident sides 114, and in leading
In tabula rasa 110 transmit, segment beam L by bottom surface 116 site 116a scatter and from going out light
Light guide plate 110 is left in face 112.
As it is shown in figure 1, in light supply apparatus 120, wantonly two adjacent light-emitting diodes 124
Spacing (pitch) is P, and the light-emitting area of each light-emitting diode 124 is to effective lighting district
The beeline at the edge of 112b is A.In order to make the brightness uniformity in effective lighting district 112b,
Maker can determine optimized according to the beam divergence angle α of light-emitting diode 124
A/P ratio (A/P ratio).When A/P ratio is the highest, display light uniformity (uniformity) is more
Good.But, current liquid crystal display has been increasingly towards the development of narrow frame design, to meet
The design requirement of narrow frame, beeline A will certainly be required to reduce, and when A/P ratio mistake
Time low, will occur at the effective lighting district 112b of light incident sides 114 bright dark alternately
Hot spot (hot spot), the shaded side in Fig. 1 refers to the region that brightness is relatively low.This hot spot can pass through
Reduce spacing P and achieve a solution, but when spacing P reduces, maker must use plurality
The light-emitting diode 124 of amount, in turn results in cost and improves.
Therefore, how on the premise of not increasing manufacturing cost and meeting narrow frame design demand,
Solving aforesaid hot spot subject under discussion (hot spot issue), actually this skilled person desires most ardently solution at present
One of problem certainly.
Additionally, TaiWan, China patent announcement TWI262458 and U.S. Patent Bulletin number
US7364343 discloses light source and is arranged at the relatively thin side of wedge shape light transmissive material luminescent panel.China is specially
Profit publication number CN102449509A discloses side mounted light source and is arranged at the relatively thin side of wedge shaped light guide,
The thicker side of wedge shaped light guide has reflective coating.China Patent Publication No. CN102483522A
Disclose light source with U.S. Patent Bulletin US8189973 and be configured at the relatively thin end of wedge, wedge
Thicker end has reflector, and reflector bends with the radius of curvature with the center of curvature.The U.S.
The light that patent announcement US7360939 exposure front light-source (light guide plate) sends is through liquid crystal display
Device, reflects and passes liquid crystal display on the reflecting film, light guide plate have plural first groove with
Second groove.U.S. Patent Bulletin US7654722 discloses the reflecting surface of light guide plate and is configured with multiple
Number V-arrangement catoptric arrangement.TaiWan, China patent announcement TWI356204 disclose light guide plate enter light
Face is formed with two kinds of various sizes of oval light entrance structures thereofs.U.S. Patent Bulletin US6254245
Disclose marginal ray source and be arranged at the relatively thin side of light guide plate.China Patent Publication No. CN102349006A
Disclose multiple light guide section be configured at multi-section light guide and there is multiple reflector.TaiWan, China is special
Profit publication number TW201020638 discloses the light beam less parallel injection that luminescence component sends, light beam
It is incident upon the curved surface of reflecting element and at least through the incidence surface of incidence light guide plate after primary event.
Summary of the invention
The present invention provides a kind of area source with good light-emitting uniformity.
Other objects and advantages of the present invention can obtain from the technical characteristic that disclosed herein
To further understanding.
For reaching one of above-mentioned or partly or entirely purpose or other purpose, the present invention provides one
Planting area source, it includes light guide plate and light supply apparatus.Light guide plate include plate body and at least one
Prism portion, plate body have the light incident sides mirrored sides relative with light incident sides, bottom surface with
And the exiting surface relative with bottom surface, wherein light incident sides and mirrored sides respectively with bottom surface with go out light
Face connects, and the thickness essence of the height of the height of light incident sides, mirrored sides and plate body
Upper identical.Additionally, prism portion is configured on the bottom surface of plate body, wherein prism portion has each other
The first adjacent plane and the second plane, the first plane is less than the second plane with the angle of bottom surface
With the angle of bottom surface, and the beeline of the first plane and light incident sides less than the second plane and enters
The beeline of light side.Light supply apparatus configuration is adjacent to light incident sides.
In an embodiment of the present invention, above-mentioned area source also includes light absorbent, light absorbent
It is attached at the second plane.
In an embodiment of the present invention, the area of the first above-mentioned plane is more than the face of the second plane
Long-pending.
In an embodiment of the present invention, the second above-mentioned plane and mirrored sides have a distance.
In an embodiment of the present invention, the angle of the first above-mentioned plane and bottom surface is between 0 degree extremely
Between 30 degree, and the angle of the second plane and bottom surface is between 0 degree to 90 degree.
In an embodiment of the present invention, above-mentioned mirrored sides includes curved surface.
In an embodiment of the present invention, above-mentioned mirrored sides includes multiple plane.
In an embodiment of the present invention, above-mentioned mirrored sides includes matsurface.
In an embodiment of the present invention, above-mentioned light incident sides is parallel to each other with mirrored sides, and
Light incident sides is parallel to the bearing of trend of light supply apparatus.
In an embodiment of the present invention, above-mentioned light guide plate also includes reflected coat layer, and reflection plating
Layer is positioned in mirrored sides.
In an embodiment of the present invention, above-mentioned light guide plate also includes reflector plate, and reflector plate is joined
It is placed in mirrored sides.
In an embodiment of the present invention, above-mentioned area source can farther include to be configured at prism portion
The end reflecting plate of lower section.
In an embodiment of the present invention, above-mentioned area source can farther include at least one configuration
Blooming piece above exiting surface.
In an embodiment of the present invention, above-mentioned light guide plate is being parallel to the thickest end on a direction
Highly H3 is 1 ＜ H3/H 10, wherein, one with the relation of the thickness H of plate body
To the thickness direction being parallel to plate body.
Based on above-mentioned, through the first plane and the design of the second plane in prism portion, and reflection
The design of side, embodiments of the invention can increase light beam light mixing distance in light guide plate with mixed
Light effect, is effectively improved mixed light that prior art faced uneven with hot spot subject under discussion (hot spot
Issue), to obtain the area source with good light-emitting uniformity.Additionally, embodiments of the invention
The usage quantity of light-emitting diode can also be reduced, and extra without increasing on light guide plate
Mixed light district, therefore can relatively disclosure satisfy that the design requirement of narrow frame in the application of display.
For the features described above of the present invention and advantage can be become apparent, special embodiment below,
And coordinate institute's accompanying drawing to be described in detail below.
Accompanying drawing explanation
Fig. 1 is the schematic top plan view of existing area source.
Fig. 2 is the cross-sectional schematic along the I-I ' section in Fig. 1.
Fig. 3 is the cross-sectional schematic of the area source of first embodiment of the invention.
Optics behavior at the position P1 that Fig. 4 A to Fig. 4 F is respectively in Fig. 3 to position P6
Schematic diagram.
Fig. 5 is the generalized section of another kind of mirrored sides in first embodiment of the invention.
Fig. 6 is the cross-sectional schematic of the area source of second embodiment of the invention.
Fig. 7 is the cross-sectional schematic of the area source of third embodiment of the invention.
Fig. 8 is the cross-sectional schematic of the area source of fourth embodiment of the invention.
Fig. 9 A to Fig. 9 C is the design signal of the different mirrored sides of fifth embodiment of the invention
Figure.
Detailed description of the invention
For the present invention aforementioned and other technology contents, feature and effect, coordinate ginseng following
In the detailed description of the preferred embodiment examining accompanying drawing, can clearly present.In following example
The direction term being previously mentioned, such as: upper and lower, left and right, front or rear etc., is only with reference to attached
The direction of figure.Therefore, the direction term of use is used to illustrate not for limiting the present invention.
[first embodiment]
Fig. 3 is the cross-sectional schematic of the area source of first embodiment of the invention.Refer to Fig. 3,
The area source 200 of the present embodiment includes light guide plate 210 and light supply apparatus 220.Light guide plate 210
Having plate body 212 and multiple prism portion 214, wherein plate body 212 has light incident sides
Mirrored sides 212b, bottom surface 212c and and bottom surface relative with light incident sides 212a for 212a
Exiting surface 212d relative for 212c, and light incident sides 212a and mirrored sides 212b respectively with the end
Face 212c is connected with exiting surface 212d.Prism portion 214 is generally adjacent to plate body 212
Bottom surface 212c, and each prism portion 214 have the first plane 214a adjacent to each other with
And second plane 214b, the angle theta of the first plane 214a and bottom surface 212c1Flat less than second
The angle theta of face 214b and bottom surface 212c2, and the first plane 214a and light incident sides 212a
Beeline is less than the beeline of the second plane 214b with light incident sides 212a.In other words,
First plane 214a and light incident sides 212a in the beeline being parallel on the Dy of direction less than the
Two planes 214b and light incident sides 212a are in the beeline being parallel on the Dy of direction.Citing
For, in the present embodiment, direction Dx marked in Fig. 3 and direction Dy and direction
Dz can corresponding X-axis, Y-axis and Z axis to three-dimensional coordinate, so the invention is not restricted to this.
Additionally, light supply apparatus 220 is adjacent to the light incident sides 212a configuration of plate body 212.This enforcement
The area source 200 of example can apply to the backlight of display, front light-source, illuminator (as
Cabinet, cabinet display lamp) in.
It should be noted that the beeline definition of the first plane 214a and light incident sides 212a
It is any point and the minimum range of any point in light incident sides 212a in the first plane 214a, and
The beeline of the second plane 214b and light incident sides 212a is defined as the second plane 214b and takes up an official post
A little with the minimum range of any point in light incident sides 212a.
In the present embodiment, light guide plate 210 has plate body 212 and multiple prism portion 214
The mode that can pass through ejection formation (mold injection) makes, and plate body 212 and prism portion
214 can be identical material.In other words, plate body 212 and prism portion 214 thereon are one
Molding.In the present embodiment, the material of light guide plate 210 e.g. polymethyl methacrylate
(Polymethylmethacrylate, PMMA) or other can be guide-lighting transparent material.
Light supply apparatus 220 is adjacent to light incident sides 212a of plate body 212 and configures along direction Dx.
For example, the light supply apparatus 220 of the present embodiment for example, includes circuit board 222 and multiple
The light-emitting diode light bar (LED light bar) of light-emitting diode 224, wherein light-emitting diodes
Tube elements 224 is configured on circuit board 222 along direction Dx, and electrically connects with circuit board 222.
In the embodiment that other is feasible, light supply apparatus 220 is except using aforesaid light emitting diode
Outside lamp bar, it is possible to employing cathode fluorescent tube or the light supply apparatus of other kenel, but this
Invention is not limited to this.
Furthermore, in the present embodiment, the second plane 214b has with mirrored sides 212b
Having distance d, and distance d is parallel to direction Dy, in other words, distance d is bottom surface 212c
A part.Additionally, the length of distance d is less than prism portion 214 at bottom surface 212c in direction
Length on Dy.Additionally, by printing net-point on the surface of distance d (portion bottom surface 212c)
Or processing micro structure, picture homogeneous degree can be improved.
In the present embodiment, in order to strengthen the reflection effect of mirrored sides 212b of plate body 212
Rate, the mode that can pass through plated film forms reflected coat layer in mirrored sides 212b, or in reflection
Reflector plate is pasted on the 212b of side.In addition to reflected coat layer with reflector plate, the present embodiment also may be used
Mirrored sides 212b is designed as matsurface (roughened surface).The reflection of the present embodiment
Side 212b has reflected coat layer, reflector plate or matsurface can also be applied to other enforcement of this case
In example, therefore the invention is not restricted to this.
It should be noted that light incident sides 212a of plate body 212 is being parallel to direction Dz
On the thickness H of height H1, the height H2 of mirrored sides 212b and plate body 212 big
In cause identical, thereby can make light guide plate 210 integral thickness reduce and realize the effect of thin type.
Herein, the height H1 of light incident sides 212a, the height H2 of mirrored sides 212b and tabular
The thickness H of body 212 allows a certain degree of error.In other words, the bottom surface 212c of plate body 212
It is substantially parallel to exiting surface 212d.Additionally, light guide plate 210 is being parallel on the Dz of direction
The thickness H of the height H3 substantially plate body 212 of thick end is plus the height in prism portion 214
H4, and 1 ＜ H3/H 10, can increase light beam L light mixing distance in light guide plate 210 with mixed
Light effect.If H3/H ＜ 1, light guide plate 210 is similar to traditional Wedge shape light conduction board, light beam L without
Method is transferred to mirrored sides 212b, owing to not having enough light mixing distance, causes mixed light uneven,
If 10 ＜ H3/H, then the integral thickness of light guide plate 210 is blocked up, it is impossible to realize the effect of thin type.
As it is shown on figure 3, the present invention is by angle theta1It is designed as less than angle theta2.Work as angle theta1
Less than angle theta2Time, most light beam L of light guide plate 210 are entered from light incident sides 212a
Can successfully through the first plane 214a and the total reflection of exiting surface 212d and be delivered to
Mirrored sides 212b.Afterwards, light beam L can be returned reflection (reflected by mirrored sides 212b
back).Then, the light beam L ' reflected by mirrored sides 212b can be again by the first plane 214a
Reflect and leave light guide plate 210 from exiting surface 212d.Thereby, light beam L can be increased at light guide plate
Light mixing distance in 210 is to mix equably.It should be noted that by mirrored sides 212b anti-
The number of times that the light beam L ' penetrated is reflected by the first plane 214a can be not limited to 1 time, in other words,
The light beam L ' reflected by mirrored sides 212b can by first plane 214a reflection repeatedly after the most just from
Exiting surface 212d leaves light guide plate 210.
At light beam L during light incident sides 212a is delivered to mirrored sides 212b, from respectively
The light beam L that individual light-emitting diode 224 is sent is meeting mixed light equably in light guide plate 210,
Therefore, when light beam L ' leaves light guide plate 210 from exiting surface 212d, it is less susceptible to mixed light uneven
Even and hot spot subject under discussion (hot spot issue).Additionally, due to light beam L is in light guide plate 210
Light mixing distance increases and can mix equably, so when the quantity of light-emitting diode 224 subtracts
Time few, light beam L can mix equally in light guide plate 210 equably, therefore can reduce luminous two
The usage quantity of pole tube elements 224.In the present embodiment, angle theta1E.g. between 0 degree extremely
Between 30 degree, angle theta2E.g. between 0 degree to 90 degree.
It addition, at light beam L during light incident sides 212a is delivered to mirrored sides 212b,
The direction of propagation of light beam L can be gradually close to the direction of parallel exiting surface 212d, when light beam L quilt
After the reflection of mirrored sides 212b, it may be necessary to reflection repeatedly just can make angle of incidence be less than critical angle
θcAnd go out light at exiting surface 212d.Therefore, at light guide plate 210 near mirrored sides 212b
Position, emitting brightness may be relatively low.In one embodiment, angle theta1From mirrored sides 212b
Toward light incident sides 212a direction decrescence, to compensate light guide plate 210 near mirrored sides 212b
Position, the problem that emitting brightness is relatively low.The angle theta of the present embodiment1From mirrored sides 212b
The direction of past light incident sides 212a feature decrescence can also be applied to this case, and other has at least 2
In the embodiment of individual first plane 214a.
In all embodiments of this case, light incident sides 212a of plate body 212 is the most optional
Whether using special optical treatment, for example, light incident sides 212a of light guide plate 210 can
Optical microstructures (optical micro-structures), such as lenticule are optionally set
(lenticular), v-shaped structure (V-cut), there is the reflecting material etc. of scattering nature.For example,
V-shaped structure e.g. arranges the light-emitting diode 224 corresponding to light supply apparatus 220 to increase
Add the dispersion angle of light beam L, and the light beam L uniformity can be promoted, due to light-emitting diode
The usage quantity of 224 can reduce, so the reflecting material of scattering nature can easily be arranged at adjacent
Light-emitting diode 224 between interval at, and will reflection light beam L ' be reflected back light guide plate
210 again with.Therefore, can be changed by optical microstructures set in light incident sides 212a
That is apt to light incident sides 212a enters light efficiency, and then promotes the optical appearance of light guide plate 210.
Owing to the first plane 214a and light incident sides 212a of the present embodiment adjoin, therefore first
Plane 214a is 0 with the beeline of light incident sides 212a.In the embodiment that other is feasible,
First plane 214a can not be 0 (the i.e. first plane with the beeline of light incident sides 212a
214a does not adjoins with light incident sides 212a), this field tool usually intellectual can be according to reality
Border design requirement and change the beeline of the first plane 214a and light incident sides 212a.
As it is shown on figure 3, the area of first plane 214a of the present embodiment to be greater than second flat
The area of face 214b, when the area of the first plane 214a is more than the area of the second plane 214b,
Contribute to promoting the efficiency that light beam L is reflected in light guide plate 210.It should be noted that
The area tendency of two planes 214b is the smaller the better, to reduce the probability of light leak, but due to angle
θ1It is not 0, therefore the area of the second plane 214b also will not be 0.In a feasible embodiment,
We can attach light screening material or light absorbent in the second plane 214b, to improve further the
Light leakage phenomena that two planes 214b are caused or make because of the reflection in the second plane 214b
Light beam L injection light guide plate 210 causes bright line.
Optics behavior at the position P1 that Fig. 4 A to Fig. 4 F is respectively in Fig. 3 to position P6
Schematic diagram.Herein, the material of light guide plate 210 is polymethyl methacrylate (PMMA),
Its refractive index (nLGP) it is 1.49, and the refractive index (n of airair) it is 1.00.Following derivation is equal
Calculate according to aforesaid condition.
Refer to Fig. 4 A, at the P1 of position, light beam L is incident on entering of light incident sides 212a
Firing angle (angle thetalight) can be between 0 ° to 90 °, according to Snell's law (formula 1),
Refraction angle (angle theta can be deducedi) between 0 ° to 42 °.
nair×sinθlight=nLGP×sinθiFormula 1
Enter the light beam L after light guide plate 210 can transmit by orienting reflex side 212b, and
During transmission, light beam L can be totally reflected by the first plane 214a and exiting surface 212d.
Below by collocation Fig. 4 B and Fig. 4 C for the optics behavior (optical at position P2 and position P3
Behavior) it is described.
Refer to Fig. 4 B, at the P2 of position, due to exiting surface 212d be generally perpendicular to into
Light side 212a, therefore light beam L is in the angle of incidence (angle theta of exiting surface 212dj) between 48 ° extremely
(i.e. θ between 90 °j=90 ° of-θi), and according to Snell's law (formula 2), can deduce and work as
Angle thetaoutWhen being 90 °, critical angle θcIt is about 42 °.Due to angle of incidence (angle thetaj) more than facing
Angle, boundary θc, therefore the light beam L of the overwhelming majority can be reflected by exiting surface 212d and continue at leaded light
Plate 210 transmits, and then is transferred to mirrored sides 212b.
nair×sinθc=nLGP×sinθoutFormula 2
Refer to Fig. 4 C, at the P3 of position, angle theta1, angle thetaiAnd angle thetai’Three
Between relation as shown in Equation 3, angle thetai’With angle thetak(angle of incidence) relation therebetween is such as
Shown in formula 4, wherein angle thetakFor being incident on the angle of incidence of the first plane 214a, and angle theta1、
Angle thetaiWith angle thetakRelation between three is as shown in Equation 5.
θi’=θi-θ1Formula 3
θk=90 ° of-θi’Formula 4
θk=90 ° of-θi+θ1Formula 5
Knowable to formula 3 to formula 5, angle thetakBetween (48 ° of+θ1) between 90 °, due to angle
θkMore than angle of total reflection θc(θc=42 °), therefore the light beam L of the overwhelming majority can be by the first plane
214a is reflected and continues to transmit in light guide plate 210, and then is transferred to mirrored sides 212b.
Assume that light beam L is by the first plane 214a n time (n > 1) of reflection, now, angle of incidence meeting
From θkIncrease to θk’, and angle of incidence (angle thetak’) as shown in Equation 6.
θk’=90 ° of-θi+nθ1Formula 6
It is clear that after n secondary reflection, angle of incidence (angle thetak’) it is between (48 ° of+n θ1)
And between 90 °, no matter therefore through several secondary reflections, angle of incidence (angle thetak’) all can be more than complete
The critical angle θ of reflectionc(θc=42 °), therefore the light beam L of the overwhelming majority still can be by the first plane
214a is reflected and continues to transmit in light guide plate 210, and then is transferred to mirrored sides 212b.
Refer to Fig. 4 D, at the P4 of position, it is assumed that via the light of the first plane 214a reflection
Bundle L can be reflected by exiting surface 212d, and is to be incident to reflection after being reflected by exiting surface 212d
Side 212b, now, the direction of transfer of light beam L and bottom surface 212c or the folder of exiting surface 212d
Angle is θi’, and the light beam L ' reflected by mirrored sides 212b and bottom surface 212c or exiting surface 212d
Angle be θr。
When mirrored sides 212b is curved surface, angle thetarWith angle thetai’Relation such as formula 7 institute
Showing, wherein t is the height that light beam L is incident to mirrored sides 212b, and 0 < t < H, R is
The radius of curvature of mirrored sides 212b.
θr=θi’+2sin-1(t/R) formula 7
Refer to Fig. 4 E, the light beam L ' after being reflected by mirrored sides 212b can be toward the first plane
214a transmits.At the P5 of position, the light beam L ' reflected by mirrored sides 212b and bottom surface 212c
Or the angle of exiting surface 212d is θr, and by the biography of the light beam L ' after the first plane 214a reflection
The angle passing direction and bottom surface 212c or exiting surface 212d is θr’, and angle theta1, angle thetar
And angle thetar’The relation of three is as shown in Equation 8.
θr’=θr+θ1Formula 8
Assume that the light beam L ' after being reflected by mirrored sides 212b can be by the first plane 214a reflection n
Secondary (n > 1), now, angle of incidence can be from θr’Increase to θr”, and incidence angle θr”Such as formula 9 institute
Show.
θr”=θr+nθ1Formula 9
Refer to Fig. 4 F, can court by the light beam L ' after the first plane 214a reflection one or many
Transmit to exiting surface 212d, and at the P6 of position, light beam L ' is incident to exiting surface 212d's
Angle of incidence is angle thetam, and angle thetamWith angle thetar’Relation as shown in Equation 10.
θm=90 ° of-θr’Formula 10
When angle of incidence (angle thetam) less than critical angle θc(i.e. 0 ° θm＜ 42 °) time,
Light beam L ' can leave light guide plate 210 from exiting surface 212d.In other words, angle theta is worked asr’More than or
Equal to 48 ° of (i.e. 48 ° θr’＜ 90 °) time, light beam L ' can leave leaded light from exiting surface 212d
Plate 210.When light beam L ' by the order of reflection of the first plane 214a the most time, light beam L ' is from going out light
The probability that face 212d leaves light guide plate 210 is the highest.
Knowable to the optics behavior of above-mentioned position P1 to position P6, enter in light guide plate 210
Overwhelming majority light beam L can be reflected with exiting surface 212d by the first plane 214a and be transferred to reflection
Side 212b.It is clear that the light beam L entered in light guide plate 210 is in light incident sides 212a
And can mixed light fully between mirrored sides 212b.Afterwards, by mirrored sides 212b and
The light beam L ' that first plane 214a in prism portion 214 is reflected can leave via exiting surface 212d
Light guide plate 210.
Fig. 5 is the generalized section of another kind of mirrored sides in first embodiment of the invention.Please join
According to Fig. 5, mirrored sides 212b of the present embodiment is in addition to can be designed as curved surface, it is also possible to
Including two or more planes.In Figure 5, mirrored sides 212b is by two symmetrical putting down
E1, E2 are constituted in face, and one of them plane E2 is (90 ° of+θ with the angle of bottom surface 212ct),
Angle thetai’With angle thetarAs defined above state, be omitted hereinafter.Angle thetat, angle thetai’
With angle thetarThe relation of three is as shown in Equation 11.
θr=θi’+2θtFormula 11
Work as θt＞ (n × θ1During)/2, light beam L ' can leave light guide plate from exiting surface 212d
210.For example, (incident side about it is roughly equal to when the light guide plate 210 length on the Dy of direction
Face 212a is to the distance of mirrored sides 212b) it is 205 millimeters, the thickness H on the Dz of direction
When (distance of bottom surface 212c and exiting surface 212d) is 0.8 millimeter to 1.8 millimeters, light beam L '
About reflect 46 times with exiting surface 212d in the first plane 214a, so angle thetatAt least need big
In 12.9 °.
Mirrored sides 212b in the present invention is not limited to include two symmetrical planes E1, E2,
May also comprise multiple symmetrically or non-symmetrically plane.Furthermore, mirrored sides 212b can be passed through
Unsymmetrical plan adjusts the light beam L ' amount of light at exiting surface 212d.
In embodiment described later, same or analogous label represents same or analogous element,
It describes in detail and is not repeated to record.
[the second embodiment]
Fig. 6 is the cross-sectional schematic of the area source of second embodiment of the invention.Refer to Fig. 6,
The area source 300 of the present embodiment is similar with the area source 200 of first embodiment, and only the two is main
It is in place of difference: mirrored sides 312b of the present embodiment uses the design similar to Fig. 5, this
The light guide plate 210 ' of embodiment has single prism portion 314, and it is flat that prism portion 314 has first
Face 314a and the second plane 314b, and the second plane 314b and mirrored sides 312b away from
It is 0 from d.
[the 3rd embodiment]
Fig. 7 is the cross-sectional schematic of the area source of third embodiment of the invention.Refer to Fig. 7,
The area source 400 of the present embodiment is similar with the area source 300 of the second embodiment, and only the two is main
It is in place of difference: the light guide plate 210 of the present embodiment " there is single prism portion 414, prism
Portion 414 has the first plane 414a and the second plane 414b, and the second plane 414b is with anti-
Distance d penetrating side 412b is not 0.For example, the length of aforesaid distance d is less than rib
Mirror portion 414 is in bottom surface 212c length on the Dy of direction.
[the 4th embodiment]
Fig. 8 is the cross-sectional schematic of the area source of fourth embodiment of the invention.Refer to Fig. 8,
The area source 500 of the present embodiment is similar with the area source 200 of first embodiment, and only the two is main
Be in place of difference: the area source 500 of the present embodiment farther include end reflecting plate RF and
Blooming piece OP, wherein reflecting plate RF in the end is arranged in lower section (the namely rib of light guide plate 210
The lower section in mirror portion 214), and the top that blooming piece OP is configuration light guide plate 210 (namely goes out
The top of bright finish 212d), light beam L is gone out light by the exiting surface 212d of light guide plate 210.
In the present embodiment, reflecting plate RF in the end can improve light beam L effectively from light guide plate 210
Bottom light leak and reflection light beam L return light guide plate 210 and recycle, and blooming piece OP can
Light performance optimization is gone out with make area source 500 further.For example, blooming piece OP example
As for diffusion sheet (diffuser), prismatic lens (prism) or aforesaid combination.In a preferred embodiment
In, blooming piece OP includes diffusion sheet on, once diffusion sheet and one group of orthogonal prism
Sheet, and this organize orthogonal prismatic lens be arranged between diffusion sheet and lower diffusion sheet.
Additionally, in other embodiments, reflecting plate RF is configured in light guide plate 210 at the end
Top (the namely top of exiting surface 212d), and blooming piece OP configuration light guide plate 210
Lower section (the namely lower section in prism portion 214), light beam L is gone out light by the lower section of light guide plate 210,
Namely light beam L is gone out light by the prism portion 214 of light guide plate 210, has same optical effect,
Therefore the invention is not restricted to this.
It should be noted that the end reflecting plate RF of the present embodiment can select with blooming piece OP
One configuration.Additionally, the end reflecting plate RF of the present embodiment can also be applied to blooming piece OP
In this case other embodiments.
[the 5th embodiment]
Fig. 9 A to Fig. 9 C is the design signal of the different mirrored sides of fifth embodiment of the invention
Figure.Referring to Fig. 9 A to Fig. 9 C, light incident sides 212a of light guide plate 210 and reflection side
A 212b straight line path parallel to each other and along parallel direction Dx in face extends, light incident sides
212a is parallel to the bearing of trend of light supply apparatus, and this straight line path is parallel to light supply apparatus and (does not paints
Show) bearing of trend, and mirrored sides 212b can extend along straight line path (such as Fig. 9 A institute
Show), or mirrored sides 212b ', 212b " along curved path extend (as Fig. 9 B with
Shown in Fig. 9 C).Furthermore, the light guide plate 210 of Fig. 9 A is at direction Dy and direction Dx
The plane formed is a rectangle, and mirrored sides 212b parallel direction Dx, and Fig. 9 B
Mirrored sides 212b of light guide plate 210 ' then direction Dy highlight light guide plate 210, Fig. 9 C
Mirrored sides 212b " the then recessed light guide plate of direction Dy 210.
Hold above-mentioned, different mirrored sides 212b, 212b ', 212b " design, thus it is possible to vary
Light beam L distribution in light guide plate 210, contributes to meeting different design requirements.Citing and
Speech, light beam L is incident to mirrored sides 210b of Fig. 9 B from light incident sides 212a ' and be reflected back
Light incident sides 212a, the light beam L ' of reflection is practically parallel with each other, and the reflection light beam than Fig. 9 A
L ' more restrains.Light beam L is incident to mirrored sides 210b of Fig. 9 C from light incident sides 212a "
And it being reflected back light incident sides 212a, the light beam L ' of reflection more dissipates, and degree of divergence is more than figure
The reflection light beam L ' of 9A.Additionally, mirrored sides 212b of the present embodiment, 212b ', 212b "
Design can apply in other embodiments of the invention, therefore the invention is not restricted to this.
Summary, the area source of embodiments of the invention at least has that following one of them is excellent
Point: increase light beam light mixing distance in light guide plate and light mixing effect, can be effectively improved existing
The uneven face light with acquisition with hot spot subject under discussion with good light-emitting uniformity of mixed light in technology
Source.Further, it is also possible to reduce the usage quantity of light-emitting diode, and without at light guide plate
The mixed light district that upper increase is extra, therefore can relatively disclosure satisfy that setting of narrow frame in the application of display
Meter demand.
The above, only the preferred embodiments of the present invention, it is impossible to limit the present invention with this
Implement scope, the most all according to claims of the present invention and description made simple
Equivalence change and amendment, all still fall within the scope that patent of the present invention covers.Additionally the present invention appoint
Whole purposes that one embodiment or claim are not necessary to realize disclosed herein or advantage or spy
Point.Additionally, summary and denomination of invention are intended merely to assist patent document retrieval to be used, not use
Limit the interest field of the present invention.Additionally, this specification or claims are mentioned "
One ", " second " etc. only in order to the different embodiment of title or difference naming element (element) or
Scope, and be not used for limiting the upper limit in number of elements or lower limit.
Reference numerals list
100,200,300,400,500: area source
110,210,210 ', 210 ": light guide plate
112,212d: exiting surface
112a: surrounding zone
112b: effective lighting district
114,212a: light incident sides
116,212c: bottom surface
116a: site
120,220: light supply apparatus
122,222: circuit board
124,224: light-emitting diode
212: plate body
212b, 212b ', 212b ", 312b, 412b: mirrored sides
214,314,414: prism portion
214a, 314a, 414a: the first plane
214b, 314b, 414b: the second plane
A, d: distance
Dx, Dy, Dz: direction
E1, E2: plane
H: thickness
H1, H2, H3, H4: highly
L, L ': light beam
OP: blooming piece
P: spacing
P1, P2, P3, P4, P5, P6: position
RF: end reflecting plate
α: beam divergence angle
θ1、θ2、θi、θi’、θj、θk、θr、θr’、θt、θm、θlight、θout: angle
Claims (13)
1. an area source, including a light guide plate and a light supply apparatus, wherein
Described light guide plate includes a plate body and at least one prism portion,
Described plate body has a light incident sides, a reflection relative with described light incident sides
Side, a bottom surface and an exiting surface relative with described bottom surface, wherein said incident side
Face is connected with described bottom surface and described exiting surface respectively with described mirrored sides, and described in enter
The thickness of the height of light side, the height of described mirrored sides and described plate body is substantially
It is upper identical,
Described prism portion is configured on the described bottom surface of described plate body, wherein said prism
Portion has one first plane adjacent to each other and one second plane, described first plane with
The angle of described bottom surface less than the angle of described second plane and described bottom surface, described first
Plane is less than described second plane and described incident side with the beeline of described light incident sides
The beeline in face, described second plane is pasted with a light absorbent,
Described light supply apparatus is adjacent to the configuration of described light incident sides.
2. area source as claimed in claim 1, the area of wherein said first plane is more than institute
State the area of the second plane.
3. area source as claimed in claim 1, wherein said second plane and described reflection side
Mask has a distance.
4. area source as claimed in claim 1, wherein said first plane and described bottom surface
Angle is between 0 degree to 30 degree, and the angle of described second plane and described bottom surface is between 0
Spend between 90 degree.
5. area source as claimed in claim 1, wherein said mirrored sides includes a curved surface.
6. area source as claimed in claim 1, wherein said mirrored sides includes multiple plane.
7. area source as claimed in claim 1, wherein said mirrored sides includes a matsurface.
8. area source as claimed in claim 1, wherein said light incident sides and described reflection side
Face is parallel to each other, and described light incident sides is parallel to the bearing of trend of described light supply apparatus.
9. area source as claimed in claim 1, wherein said light guide plate also includes a reflection plating
Layer, and described reflected coat layer is positioned in described mirrored sides.
10. area source as claimed in claim 1, wherein said light guide plate also includes a reflection
Sheet, and described reflector plate is configured in described mirrored sides.
11. area sources as claimed in claim 1, also include an end reflecting plate, are configured at institute
State below prism portion.
12. area sources as claimed in claim 1, also include at least one blooming piece, configuration
Above described exiting surface.
13. area sources as claimed in claim 1, wherein said light guide plate is being parallel to a direction
On the relation of thickness H of height H3 and described plate body of the thickest end be 1 ＜ H3/H 10,
And one is to the thickness direction being parallel to described plate body.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310243997.9A CN104235637B (en) | 2013-06-19 | Area source | |
| US14/297,630 US9703032B2 (en) | 2013-06-19 | 2014-06-06 | Planar light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310243997.9A CN104235637B (en) | 2013-06-19 | Area source |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104235637A CN104235637A (en) | 2014-12-24 |
| CN104235637B true CN104235637B (en) | 2016-11-30 |
Family
ID=
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| KR20060042607A (en) * | 2004-11-10 | 2006-05-15 | 삼성에스디아이 주식회사 | A liquid crysal display device having a new type structure |
| WO2012037035A1 (en) * | 2010-09-13 | 2012-03-22 | Teledyne Lighting And Display Products, Inc. | Collimating waveguide apparatus and method |
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| CN1301977A (en) * | 1999-12-28 | 2001-07-04 | 富士通化成株式会社 | Lighting device |
| CN1400498A (en) * | 2001-07-27 | 2003-03-05 | 阿尔卑斯电气株式会社 | Surface lighting device and liquid crystal display device |
| CN1438526A (en) * | 2002-02-13 | 2003-08-27 | 阿尔卑斯电气株式会社 | Face light-emitting device and liguid crystal displaying apparatus |
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| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190121 Address after: Hsinchu Science Park, Taiwan, China Patentee after: Zhongqiang Photoelectric Co., Ltd. Address before: Xinzhu Science Industrial Park Patentee before: YOUNG Lighting Technology Inc |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161130 Termination date: 20200619 |