U.S. patent application number 15/222936 was filed with the patent office on 2016-11-17 for light guide plate with multi-directional structures.
The applicant listed for this patent is Radiant Opto-Electronics Corporation. Invention is credited to Chia-Yin CHANG, Chih-Chiang CHANG, Shan-Fu CHANG, Po-Chang HUANG, Shin-Bo LIN.
Application Number | 20160334563 15/222936 |
Document ID | / |
Family ID | 52480233 |
Filed Date | 2016-11-17 |
United States Patent
Application |
20160334563 |
Kind Code |
A1 |
CHANG; Chia-Yin ; et
al. |
November 17, 2016 |
LIGHT GUIDE PLATE WITH MULTI-DIRECTIONAL STRUCTURES
Abstract
A light guide plate with multi-directional structures includes a
main body, a plurality of first microstructures and a plurality of
second microstructures. The main body includes a light-incident
surface, a light-emitting surface and a reflecting surface. The
light-incident surface connects the light-emitting surface and the
reflecting surface. The first, microstructures are disposed on the
light-emitting surface or the reflecting surface and arranged along
a first extending direction The second microstructures are disposed
on the light-emitting surface or the reflecting surface and
arranged along a second extending direction. The second
microstructures and the first microstructures are disposed on the
same plane and intersect with each other. Each of the second
microstructures is a single stripe pattern, and has a width which
becomes gradually smaller from one end of the second microstructure
near the light-incident surface to the other end of the second
microstructure away from the light-incident surface.
Inventors: |
CHANG; Chia-Yin; (KAOHSIUNG,
TW) ; HUANG; Po-Chang; (KAOHSIUNG, TW) ;
CHANG; Chih-Chiang; (KAOHSIUNG, TW) ; CHANG;
Shan-Fu; (KAOHSIUNG, TW) ; LIN; Shin-Bo;
(KAOHSIUNG, TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Radiant Opto-Electronics Corporation |
Kaohsiung |
|
TW |
|
|
Family ID: |
52480233 |
Appl. No.: |
15/222936 |
Filed: |
July 28, 2016 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
14100028 |
Dec 9, 2013 |
9435936 |
|
|
15222936 |
|
|
|
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G02B 6/0038 20130101;
G02B 6/0036 20130101; G02B 6/0061 20130101 |
International
Class: |
F21V 8/00 20060101
F21V008/00 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 20, 2013 |
TW |
102129835 |
Claims
1. A light guide plate comprises: a main body, comprising: a
light-incident surface; and at least one main surface connected to
the light-incident surface; at least one first region; and at least
one second region, disposed adjusted to the at least one first
region, wherein the at least one first region and at least one the
second region are disposed on the same surface of the at least one
main surface; wherein a plurality of microstructures are disposed
in at least one portion of the at least one first region and the at
least one second region.
2. The light guide plate of claim 1, wherein a width of the at
least one first region becomes gradually greater from one end of
the at least one first region near the light-incident surface to
the other end of the at least one first region away from the
light-incident surface; and a width of the at least one second
region becomes gradually smaller from one end of the at least one
second region near the light-incident surface to the other end of
the at least one second region away from the light-incident
surface.
3. The light guide plate of claim 1, wherein the microstructures
located in the first region are cut by the microstructures located
in the second region.
4. The light guide plate of claim 1, wherein the microstructures
comprise a plurality of first microstructures, and the first
microstructures are disposed in the at least one first region, and
the first microstructures are arranged along a first extending
direction.
5. The light guide plate of claim 4, wherein the first
microstructures are continuously arranged side by side.
6. The light guide plate of claim 4, wherein the microstructures
comprise a plurality of second microstructures, and the second
region is set with one single second microstructure, wherein the
second microstructures are arranged along a second extending
direction, and the second extending direction and the first
extending direction intersect with each other.
7. The light guide plate of claim 6, wherein the first extending
direction is vertical to the second extending direction.
8. The light guide plate of claim 6, wherein each of the first
microstructures or each of the second microstructures is a convex
portion or a concave portion.
9. The light guide plate of claim 8, wherein when each of the
second microstructures is the convex portion, a height of the
convex portion becomes gradually smaller from one end of each of
the second microstructures near the light-incident surface to the
other end of each of the second microstructures away from the
light-incident surface, wherein when each of the second
microstructures is the concave portion, a depth of the concave
portion becomes gradually smaller from one end of each of the
second microstructures near the light-incident surface to the other
end of each of the second microstructures away from the
light-incident surface.
10. The light guide plate of claim 4, wherein a cross-sectional
profile of each of the first microstructures is in a V-shape or an
inverted V-shape, and a first angle and a second angle are
respectively included between two respective surfaces of each of
the first microstructures and the at least one main surface.
11. The light guide plate of claim 6, wherein a cross-sectional
profile of each of the second microstructures is in a V-shape, an
inverted V-shape, an arc-shape or a trapezoid-shape.
12. The light guide plate of claim 6, wherein every two adjacent
first microstructures are equidistantly arranged, and every two
adjacent second microstructures are equidistantly arranged.
13. The light guide plate of claim 6, wherein every two adjacent
first microstructures are equidistantly arranged, and every two
adjacent second microstructures are non-equidistantly arranged.
14. The light guide plate of claim 6, wherein every two adjacent
first microstructures are non-equidistantly arranged, and every two
adjacent second microstructures are equidistantly arranged.
15. The light guide plate of claim 6, wherein every two adjacent
first microstructures are non-equidistantly arranged and every two
adjacent second microstructures are non-equidistantly arranged.
16. The light guide plate of claim 4, wherein at least one portion
of the first microstructure has a hazy surface, a matte surface, a
hair-lined surface or a rough surface.
17. The light guide plate of claim 6, wherein at least one portion
of the second microstructure has a hazy surface, a matte surface, a
hair-lined surface or a rough surface.
18. The light guide plate of claim 1, wherein a contour of the at
least one first region or the at least one second region varies
from one end near the light-incident surface to the other end away
from the light-incident surface.
19. The light guide plate of claim 8, wherein the at least one
first region and the at least one second region are arranged along
a first direction, and the contour of the at least one first region
or the at least one second region varies from the end near the
light-incident surface to the end away from the light-incident
surface along a second direction which is different from the first
direction.
20. A backlight module, comprising: a light guide plate as claimed
in claim 1; and a light source disposed adjacent to the
light-incident surface of the light guide plate.
Description
RELATED APPLICATIONS
[0001] This application is a continuation application of U.S.
application Ser. No. 14/100028, filed on Dec. 09, 2013, which
claims priority to Taiwan Application Serial Number 102129835,
filed Aug. 20 2013, the entirety of which is herein incorporated by
reference.
BACKGROUND
[0002] 1. Field of Invention
[0003] The present invention relates to a light guide plate. More
particularly, the present invention relates to a light guide plate
with multi-directional structures.
[0004] 2. Description of Related Art
[0005] A light guide plate has a light-incident surface, a
light-emitting surface and a reflecting surface. Light emitted by a
light source enters the light guide plate from the light-incident
surface, and exits from the light-emitting surface. In order to mix
the light pass through the light guide plate uniformly,
microstructures (such as dotted microstructures or striped
microstructures, a.k.a. lenticular microstructures) are generally
disposed on the light-emitting surface or the reflecting surface of
the light guide plate. However, the surfaces with dotted
microstructures are rough and may scatter the light, such that the
light exiting from the light-emitting surface of the tight guide
plate has a non-uniform direction, and its light energy is not
concentrated, thus further resulting poor luminance.
[0006] Another conventional skill is to dispose striped
microstructures with different extending directions on a
light-emitting surface and a reflecting surface of a light guide
plate. Luminance generated by the light guide plate with the
striped microstructures is better than that by the light guide
plate with dotted microstructures, but the light guide plate with
the striped microstructures is likely to generate bright and dark
lines which will affect optical appearance of the light guide
plate.
[0007] Hence, there is need to develop a light guide plate to
overcome the foregoing problems.
SUMMARY
[0008] One aspect of the present invention is to provide a light
guide plate with multi-directional structures for simultaneously
controlling light-emitting angles and optical trends of the light
guide plate by alternately disposing first microstructures and
second microstructures on the same plane of the light guide plate,
thereby achieving light-mixing and more uniform light emitting
effects. Furthermore, the uniformity of the overall light-emitting
appearance of the light guide plate can be promoted by roughening
or hazing surfaces of the first microstructures and second
microstructures. In addition, the aforementioned first
microstructures and second microstructures can be manufactured by
using the existing microstructure processes or equipment without
needing to additionally purchase new process equipment, and thus no
additional cost burden is imposed to the manufacturing process.
[0009] According to the aforementioned objects, the present
invention provides a light guide plate with multi-directional
structure. The light guide plate includes a main body, a plurality
of first microstructures and a plurality of second microstructures.
The main body includes a light-incident surface, a light-emitting
surface and a reflecting surface. The reflecting surface is
opposite to the light-emitting surface. The light-incident surface
connects the light-emitting surface and the reflecting surface. The
first microstructures are disposed on the light-emitting surface or
the reflecting surface, and the first microstructures are arranged
along a first extending direction. The second microstructures are
disposed on the light-emitting surface or the reflecting surface,
and the second microstructures are arranged along a second
extending direction. The second microstructures and the first
microstructures are disposed on the same plane and intersect with
each other. Each of the second microstructures is in a single
stripe pattern and has a width which becomes gradually smaller from
one end of each of the second microstructures near the
light-incident surface to the other end of each of the second
microstructures away from the light-incident surface.
[0010] According to the aforementioned objects, the present
invention provides another light guide plate with multi-directional
structures. The light guide plate includes a main body, a plurality
of first microstructures and a plurality of second microstructures.
The main body includes at least one optical surface. The first
microstructures are disposed on the at least one optical surface,
in which the first microstructures are arranged along a first
extending direction. The second microstructures are disposed on the
at least one optical surface, in which the second microstructures
are arranged along a second extending direction, in which the
second microstructures and the first microstructures are disposed
on the same plane and intersect with each other, in which each of
the second microstructures is in a single stripe pattern, and has a
width which becomes gradually smaller from one end of each of the
second microstructures to the other end of each of the second
microstructures.
[0011] According to an embodiment of the present invention, each of
the first microstructures is intercepted by each of the second
microstructures.
[0012] According to an embodiment of the present invention, the
first extending direction is vertical to the second extending
direction.
[0013] According to an embodiment of the present invention, each of
the first microstructures or each of the second microstructures is
a convex portion or a concave portion.
[0014] According to an embodiment of the present invention, when
each of the second microstructures is the convex portion, a height
of the convex portion becomes gradually smaller from the end of
each of the second microstructures near the light-incident surface
to the other end of each of the second microstructures away from
the light-incident surface; when each of the second microstructures
is the concave portion a depth of the concave portion becomes
gradually smaller from the end of each of the second
microstructures near the light-incident surface to the other end of
each of the second microstructures away from the light-incident
surface.
[0015] According to an embodiment of the present invention, a
cross-sectional profile of each of the first microstructures is in
a V-shape or an inverted V-shape, and a first angle and a second
angle are respectively included between two respective surfaces of
each of the first microstructures and the light-emitting surface or
the reflecting surface.
[0016] According to an embodiment of the present invention, a
cross-sectional profile of each of the second microstructures is in
a V-shape, an inverted V-shape, an arc-shape or a
trapezoid-shape.
[0017] According to an embodiment of the present invention, every
two adjacent first microstructures are equidistantly arranged, and
every two adjacent second microstructures are equidistantly
arranged.
[0018] According to an embodiment of the present invention, every
two adjacent first microstructures are equidistantly arranged, and
every two adjacent second microstructures are non-equidistantly
arranged.
[0019] According to an embodiment of the present invention, every
two adjacent first microstructures are non-equidistantly arranged,
and every two adjacent second microstructures are equidistantly
arranged.
[0020] According to an embodiment of the present invention, every
two adjacent first microstructures are non-equidistantly arranged,
and every two adjacent second microstructures are non-equidistantly
arranged.
[0021] According to an embodiment of the present invention, at
least one portion of the first microstructure has a hazy surface, a
matte surface, hair-lined surface or or a rough surface.
[0022] According to an embodiment of the present invention, at
least one portion of the second microstructure has a hazy surface,
a matte surface, a hair-lined surface or a rough surface.
[0023] It is to be understood that both the foregoing general
description and the following detailed description are by examples,
and are intended to provide further explanation of the invention as
claimed.
BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The invention can be more fully understood by reading the
following detailed description of the embodiment, with reference
made to the accompanying drawings as follows:
[0025] FIG. 1 is a schematic structural diagram showing a light
guide plate with multi-directional structures in accordance with a
first embodiment of the present invention;
[0026] FIG. 2 is a schematic cross-sectional view of one type of
first microstructures in accordance with the first embodiment of
the present invention;
[0027] FIG. 3 is a schematic cross-sectional view of another type
of first microstructures in accordance with the first embodiment of
the present invention;
[0028] FIG. 4 is a schematic cross-sectional view of one type of
second microstructures in accordance with the first embodiment of
the present invention;
[0029] FIG. 5 is a schematic cross-sectional view of another type
of second microstructures in accordance with the first embodiment
of the present invention:
[0030] FIG. 6 is a schematic structural diagram showing a light
guide plate with multi-directional structures in accordance with a
second embodiment of the present invention;
[0031] FIG. 7 is a candlepower distribution curve generated from a
light guide plate respectively in accordance with a third
embodiment of the present invention, a first comparative example, a
second comparative example and a third comparative example; and
[0032] FIG. 8 is a candlepower distribution curve generated from a
light guide plate respectively in accordance with a third
embodiment of the present invention, a fourth comparative example
and a fifth comparative example.
DETAILED DESCRIPTION
[0033] Reference will now be made in detail to the present
embodiments of the invention, examples of which are illustrated in
the accompanying drawings. Wherever possible, the same reference
numbers are used in the drawings and the description to refer to
the same or like parts.
[0034] Referring to FIG. 1, FIG. 1 is a schematic structural
diagram showing a light guide plate 100 with multi-directional
structures in accordance with a first embodiment of the present
invention. The light guide plate 100 of the present embodiment may
be applied to a backlight module (not shown). The light guide plate
100 may include a main body 120, a plurality of first
microstructures 140 and a plurality of second microstructures 160.
By disposing the first microstructures 140 and the second
microstructures 160 on the main body 120, the light guide plate 100
can change and adjust light-emitting beam angles and optical trends
of the light guide plate 100.
[0035] In the light guide plate 100, the main body 120 may he a
transparent element or other equivalents. The main body 120 mainly
includes at least one optical surface, such as a light-incident
surface 122, a light-emitting surface 124 and a reflecting surface
126. The reflecting surface 126 and the light-emitting surface 124
are respectively located on the two opposite sides of the main body
120. In addition, the light-incident surface 122 connects the
light-emitting surface 124 and the reflecting surface 126. In other
words, two opposite sides of the light-incident surface 122 are
respectively connected to a side of the light-emitting surface 124
and a side of the reflecting surface 126. A light source 190 is
disposed by the light-incident surface 122, and light emitted by
the light source 190 may enter the light guide plate 100 from the
light-incident surface 122. The first microstructures 140 and the
second microstructures 160 are disposed on the same plane. In other
words, the first microstructures 140 and the second microstructures
160 are simultaneously disposed on the optical surface of the main
body 120. In the present embodiment, the first microstructures 140
and the second microstructures 160 are simultaneously disposed on
the light-emitting surface 124 or the reflecting surface 126. In
some embodiments, the first microstructures 140 and the second
microstructures 160 are simultaneously disposed on both
light-emitting surface 124 and reflecting surface 126. Moreover,
the first microstructures 140 and the second microstructures 160 on
the same plane may intersect with each other. In one embodiment,
each of the first microstructures 140 is intercepted by each of the
second microstructures 160.
[0036] As shown in FIG. 1, each of the first microstructures 140 is
arranged on the light-emitting surface 124 along a first extending
direction D1. Meanwhile, each of the second microstructures 160 is
arranged on the light-emitting surface 124 along a second extending
direction D2. Each of the second microstructures 160 is in a single
stripe pattern. Moreover, each of the second microstructures 160
has a width which becomes gradually smaller from one end of each of
the second microstructures 160 near the light-incident surface 122
to the other end of each of the second microstructures 160 away
from the light-incident surface 122. Because the first
microstructures 140 and the second microstructures 160 intersect
with each other, the second extending direction D2 is different
from the first extending direction D1. In one embodiment, the first
extending direction D1 is vertical to the second extending
direction D2 but the present invention is not limited thereto. It
is noted that the light guide plate 100 with the first
microstructures 140 and the second microstructures 160
simultaneously disposed on the light-emitting surface 124 as shown
in FIG. 1 is merely used as an example for explanation in the
present embodiment, and the present invention is not limited
thereto. The first microstructures 140 and the second
microstructures 160 may also be simultaneously disposed on the
reflecting surface 126.
[0037] Referring to FIG. 1 and FIG. 2 simultaneously, FIG. 2 is a
schematic cross-sectional view of one type of first microstructures
in accordance with the first embodiment of the present invention.
In one embodiment, each of the first microstructures 140 may be a
convex portion protruding from the light-emitting surface 124, and
a cross-sectional profile of each of the first microstructures 140
is in an inverted V-shape. Meanwhile, each of the first
microstructures 140 has two surfaces 140a and 140b connected to the
light-emitting surface 124. A first angle .alpha. and a second
angle .beta. are respectively included between the light-emitting
surface 124 and two respective surfaces 140a and 140b. In one
embodiment, the first angle .alpha. and the second angle .beta. are
designed corresponding to different beam angles of light beam
entering the light guide plate 100, thereby changing the
light-emitting beam angles of the light guide plate 100 to increase
luminous flux and luminance value of the light guide plate 100.
Meanwhile, the shape of each of the first microstructures 140 may
be different by changing the first angle .alpha. and the second
angle .beta., and a vertical height between a top, end of each of
the first microstructures 140 and the light-emitting surface 124
may be changed accordingly. In one embodiment, the reflecting
surface 126 may be disposed with V-shape structures 180 or other
microstructures with similar functions.
[0038] Referring to FIG. 2 and FIG. 3 simultaneously, FIG. 3 is a
schematic cross-sectional view of another type of first
microstructures in accordance with the first embodiment of the
present invention. In the embodiment of FIG. 2, the first
microstructures 140 are arranged contiguously, and the first
microstructures 140 are directed connected to each other. In one
embodiment of FIG. 3, the first microstructures 140 are arranged
discontiguously, and the first microstructures 140 are not
connected. It is noted that the first microstructures 140 may be
arranged on the light-emitting surface 124 or the reflecting
surface 126 in a contiguous manner, a discontiguous manner or a
partially contiguous and partially discontiguous manner. Moreover,
every two adjacent first microstructures 140 may have an equal or
unequal distance P. Therefore, the arrangement density of the first
microstructures 140 can be changed by adjusting the distance P
between every two adjacent first microstructures 140, thereby
changing luminous flux and luminance value of the light guide plate
100 and further increasing luminance uniformity of the light guide
plate 100.
[0039] Referring to FIG. 1 and FIG. 4, FIG. 4 is a schematic
cross-sectional view of one type of second microstructures in
accordance with the first embodiment of the present invention. In
the present embodiment, each of the second microstructures 160 is a
concave portion recessed into the light-emitting surface 124, and a
cross-sectional profile of each of the second microstructures 160
is in an arc-shape. Moreover, each of the second microstructures
160 is disposed on the light-emitting surface 124 along the first
extending direction D1, and intercepts each of the first
microstructures 140. In one embodiment, a depth D of the second
microstructures 160 becomes gradually smaller from the end of each
of the second microstructures 160 near the light-incident surface
122 to the other end of each of the second microstructures 160 away
from the light-incident surface 122. In one embodiment, a distance
between every two remaining first microstructures 140 after being
intercepted by the second microstructures 160 and a length of each
of the remaining first microstructures 140 can be changed by
adjusting the depth D and a width W of each of the second
microstructures 160. Therefore, the optical trends of the light
guide plate 100 can be changed by adjusting the depth D and the
width W of each of the second microstructures 160.
[0040] Referring to FIG. 5, FIG. 5 is a schematic cross-sectional
view of another type of second microstructures in accordance with
the first embodiment of the present invention. In the present
embodiment, a cross-sectional profile of each of the second
microstructures 160 is in a trapezoid-shape. In one embodiment, a
cross-sectional profile of each of the second microstructures 160
is in a V-shape. In other embodiments, a cross-sectional profile of
each of the second microstructures 160 may be formed by a R-cut
knife, a V-cut knife, a flat knife or a polycrystalline knife.
Different cross-sectional profiles of the second microstructures
160 can achieve different light-condensing effects.
[0041] It is noted that the second microstructures 160 shown in
FIG. 4 and FIG. 5 are not connected. However, in some embodiments,
the second microstructures 160 may be connected to each other and
be arranged contiguously. Moreover, every two adjacent second
microstructures 160 may have an equal or unequal distances P'.
Therefore, the arrangement density of the second microstructures
160 can be changed by adjusting the distance P' between every two
adjacent second microstructures 160, thereby increasing
light-guiding function of the light guide plate 100.
[0042] Referring to FIG. 6, FIG. 6 is a schematic structural
diagram showing a light guide plate 200 with multi-directional
structures in accordance with a second embodiment of the present
invention. The light guide plate 200 of the present embodiment
includes a main body 220, a plurality of first microstructures 240
and a plurality of second microstructures 260. The main body 220
mainly includes a light-incident surface 222, a light-emitting
surface 224 and a reflecting surface 226. A light source 290 is
disposed by the light-incident surface 222, and light emitted by
the light source 290 may enter the light guide plate 200 from the
light-incident surface 222. Each of the first microstructures 240
and each of the second microstructures 260 are convex portions
protruding from the light-emitting surface 224. The cross-sectional
profiles of the first microstructures 240 and the second
microstructures 260 are respectively in inverted V-shape and
arc-shape. Each of the first microstructures 240 is arranged on the
light-emitting surface 224 along the first extending direction D1.
Meanwhile, each of the second microstructures 260 is arranged on
the light-emitting surface 224 along the second extending direction
D2 and intercepts the first microstructures 240. Each of the second
microstructures 260 is in a single stripe pattern. Furthermore, a
width W of each of the second microstructures 260 becomes smaller
from one end of each of the second microstructures 260 near the
light-incident surface 222 to the other end of each of the second
microstructures 260 away from the light-incident surface 222. In
other embodiments, a height H of each of the second microstructures
260 becomes smaller from one end of each of the second
microstructures 260 near the light-incident surface 222 to the
other end of each of the second microstructures 260 away from the
light-incident surface 222.
[0043] Similarly, in one embodiment, a distance between every two
remaining first microstructures 240 after being intercepted by the
second microstructures 260 and a length of each of the remaining
first microstructures 240 can be changed by adjusting the height H
and the width W of each of the second microstructures 260.
Therefore, the optical trends of the light guide plate 200 can be
changed by adjusting the height H and the width W of each of the
second microstructures 260. In one embodiment, the reflecting
surface 226 may be disposed with V-shape structures 280 or other
microstructures with similar functions.
[0044] Comparisons between a third embodiment and the conventional
light guide plates are described below. Referring to FIG. 7, FIG. 7
is a candlepower distribution curve generated from a light guide
plate respectively in accordance with the third embodiment of the
present invention, a first comparative example, a second
comparative example and a third comparative example. The light
guide plate in the third embodiment has V-shape structures disposed
on the light-emitting surface, and the first microstructures and
the second microstructures disposed on the reflecting surface. A
light guide plate in the first comparative example has dotted
structures disposed on one single surface. A light guide plate in
the second comparative example has V-shape structures disposed on
the light-emitting surface, and dotted structure disposed on the
effecting surface. A light guide plate in the third comparative
example has V-shape structures with different extending directions
respectively disposed on the light-emitting surface and the
reflecting surface. As shown in FIG. 7, the bold curve 700
represents a simulation result using the light guide plate of the
third embodiment. In comparison with curves 720, 740 and 760
showing respective results in accordance with the first comparative
example, the second comparative example and the third comparative
example, the curve 700 is smoother, meaning that light field
distribution angle can be effectively controlled by disposing the
first microstructures and the second microstructures intersected
with each other. In the curves 720, 740 and 760 of the first
comparative example, the second comparative example and the third
comparative example, the un-smooth areas thereof represent noises
of light energy loss, meaning that the control effect of the light
field distribution angle is poor.
[0045] Referring to Table 1, Table 1 is a comparison table of
luminance obtained by respectively using the light guide plates of
the aforementioned the third embodiment, the first comparative
example, the second comparative example and the third comparative
example collocated with three optical films and four optical films.
As shown in Table 1, in the third comparative example, the V-shape
structures with different extending directions respectively
disposed on the light-emitting surface and the reflecting surface
of the light guide plate help to increase luminance. However, the
light guide plate of the third comparative example may cause an
adhesion problem between the light guide plate and the optical
films and an appearance problem of bright and dark lines. On the
contrary, in the third embodiment, because the light guide plate
has the first microstructures and the second microstructures
disposed on the reflecting surface not only the aforementioned
adhesion and appearance problems can be solved, a better luminance
effect can be generated.
TABLE-US-00001 TABLE 1 Comparison table of luminance obtained by
respectively using different light guide plates collocated with
three optical films and light guide plate collocated with four
optical films first second third comparative comparative
comparative third example example example embodiment three lumi-
4551(nit) 4956(nit) 5201(nit) 5354(nit) optical nance films gain
1.0 1.04-1.08 1.14 1.18 four lumi- 3831(nit) 4983(nit) 5297(nit)
5483(nit) optical nance films gain 0.84-1 1-11 1.16 1.20
[0046] Referring to FIG. 8, FIG. 8 is a candlepower distribution
curve generated from a light guide plate respectively in accordance
with a third embodiment of the present invention, a fourth
comparative example and a fifth comparative example. A Light guide
plate in the fourth comparative example has V-shape structures
disposed on the light-emitting surface, and sandblasting structures
disposed on the reflecting surface. A Light guide plate in the
fifth comparative example has vertical V-shape structures disposed
on the light-emitting surface, and micro lens disposed on the
reflecting surface. As shown in FIG. 8, the bold curve 700
represents a simulation result using the light guide plate of the
third embodiment. In comparison with curves 820 and 840 showing
respective results in accordance with the fourth comparative
example and the fifth comparative example, the curve 700 is
smoother, meaning that light field distribution angle can be
effectively controlled by disposing the first microstructures and
the second microstructures intersected with each other. In the
curves 820 and 840 of the fourth comparative example and the fifth
comparative example, the un-smooth areas thereof represent noises
of light energy loss, meaning that the control effect of the light
field distribution angle is poor.
[0047] Referring to Table 2, Table 2 is a comparison table of
luminance obtained by respectively using the light guide plates of
the aforementioned the fourth comparative example and the fifth
comparative example collocated with a turning film. As shown in
Table 2, luminance effect obtained by the light guide plate in the
third embodiment is apparently better than the light guide plate in
the fourth comparative example and the light guide plate in the
fifth comparative example.
TABLE-US-00002 TABLE 2 Comparison table of luminance obtained by
respectively using different light guide plates collocated with a
turning film fourth fifth comparative comparative third example
example embodiment luminance 5356(nit) 4329(nit) 7177(nit) gain 1.0
0.81 1.34
[0048] In other embodiments, the light guide plates 100 and 200
with the first microstructures 140 and 240 and the second
microstructures 160 and 260 can achieve the objects of adjusting
light-emitting beam angles and optical trends of the light guide
plates 100 and 200. Meanwhile, at least one portion of surfaces of
the first microstructures 140 and 240 or the second microstructures
160 and 260 may be formed as hazy surfaces, matte surfaces,
hair-lined surfaces or rough surfaces by a sandblasting or laser
treatment, so as to increase dimming effect of the first
microstructures 140 and 240 and the second microstructure 160 and
260.
[0049] According to the aforementioned embodiments of the present
invention, the present invention can simultaneously control
light-emitting angles and optical trends of the light guide plate
by alternately disposing first microstructures and second
microstructures on the same plane of the light guide plate, thereby
achieving more uniform light-mixing and light emitting effects.
Furthermore, the uniformity of the overall light-emitting
appearance of the light guide plate can be promoted by roughening
or hazing the surfaces of the first microstructures and second
microstructures. In addition, the aforementioned first
microstructures and second microstructures can be manufactured by
using the existing microstructure processes or equipment without
needing to additionally purchase new process equipment, and thus no
additional cost burden is imposed to the manufacturing process.
[0050] Although the present invention has been described in
considerable detail with reference to certain embodiments thereof,
other embodiments are possible. Therefore, the spirit and scope of
the appended claims should not be limited to the description of the
embodiments contained herein.
[0051] It will be apparent to those skilled in the art that various
modifications and variations can be made to the structure of the
present invention without departing from the scope or spirit of the
invention. In view of the foregoing, it is intended that the
present invention cover modifications and variations of this
invention provided they fall within the scope of the following
claims.
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