CN114563839B - Light guide element and backlight module - Google Patents
Light guide element and backlight module Download PDFInfo
- Publication number
- CN114563839B CN114563839B CN202210450931.6A CN202210450931A CN114563839B CN 114563839 B CN114563839 B CN 114563839B CN 202210450931 A CN202210450931 A CN 202210450931A CN 114563839 B CN114563839 B CN 114563839B
- Authority
- CN
- China
- Prior art keywords
- light
- light incident
- curved
- microstructure
- curved surface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
Abstract
The invention provides a light guide element which comprises a main body and a plurality of microstructures. The main body comprises a bottom surface, a light emergent surface and a light incident surface. A plurality of microstructures is recessed into the bottom surface of the body. The first surface of each microstructure comprises a first curved surface of the cambered surface and is recessed towards the light incident surface. The second surface of the microstructure comprises a second curved surface of the cambered surface and is recessed towards the direction far away from the light incident surface. The third surface and the fourth surface of the microstructure are respectively connected between the first surface and the second surface and are planes. The third surface and the fourth surface are oppositely arranged relative to the symmetry plane. The bottom surface is respectively connected with the first surface, the second surface, the third surface and the fourth surface, and the symmetrical surface passes through the first curved surface and the second curved surface. In addition, a backlight module comprising the light guide element is also provided. The light guide element and the backlight module provided by the invention can improve the phenomenon of uneven brightness at the light incident side.
Description
Technical Field
The present invention relates to an optical element and an optical module, and more particularly, to a light guide element and a backlight module.
Background
The side-in backlight module comprises a light guide element and a light emitting element. The light guide element is, for example, a light guide plate. In the side-in type backlight module, uneven brightness is often generated on the light incident side (i.e. the side close to the light emitting element) due to uneven component of the light emitting element, uneven tape adhesion, electrostatic adsorption between the reflective sheet and the light guide element, warping of the optical film, and the like. Generally, to improve the phenomenon of uneven brightness on the light incident side, a columnar microstructure is added on the light incident surface of the light guide element. However, when the columnar microstructure is added, burrs are easily generated in the light guide element during demolding, and the phenomenon of poor air exhaust is easily generated in the manufacturing process, thereby greatly reducing the production yield. The background section is only provided to aid in understanding the present disclosure, and thus the disclosure in the background section may include background art that does not constitute a part of the knowledge of one skilled in the art. The disclosure in the "background" section is not intended to represent an element or problem to be solved by one or more embodiments of the present invention, nor is it intended to be within the scope of what is disclosed or suggested by those skilled in the art before the present application.
Disclosure of Invention
The invention provides a light guide element, which can improve the phenomenon of uneven brightness on the light incident side.
The invention provides a backlight module which can improve the phenomenon of uneven brightness on the light incident side.
Other objects and advantages of the present invention can be further understood from the technical features disclosed in the present invention, wherein the light guide element of the present invention comprises a main body and a plurality of microstructures. The main body comprises a bottom surface, a light emergent surface and a light incident surface. The light-emitting surface is arranged opposite to the bottom surface. The light incident surface is connected between the light emergent surface and the bottom surface. A plurality of microstructures is recessed into the bottom surface of the body. Each microstructure comprises a first surface, a second surface, a third surface and a fourth surface. The first surface deviates from the light incident surface and comprises a first curved surface. The first curved surface is a cambered surface and is concave towards the light incident surface. The outline of the orthographic projection of the first curved surface on the bottom surface has a first curvature radius, and the first curvature radius is a fixed value. The second surface faces the light incident surface and comprises a second curved surface. The second curved surface is not connected with the first curved surface. The second curved surface is an arc surface and is concave towards the direction far away from the light incident surface. The outer contour of the orthographic projection of the second curved surface on the bottom surface has a second curvature radius, and the second curvature radius is a fixed value. The first surface of each microstructure is arranged between the light incident surface and the second surface of the microstructure. The third surface is connected between the first surface and the second surface. The third surface is planar. The fourth surface is connected between the first surface and the second surface. The fourth surface is a plane. The third surface and the fourth surface are disposed opposite to each other with respect to the symmetry plane. The symmetry plane is perpendicular to the light incident surface and the bottom surface and passes through the center of the orthographic projection profile of the microstructure on the bottom surface. The bottom surface is respectively connected with the first surface, the second surface, the third surface and the fourth surface, and the symmetrical surface passes through the first curved surface and the second curved surface.
Other objects and advantages of the present invention can be further understood from the technical features disclosed in the present invention, wherein the backlight module comprises the light guide element and at least one light emitting element, wherein the at least one light emitting element is disposed beside the light incident surface of the main body of the light guide element.
Based on the above, by the refraction of the first curved surface and the second curved surface of the microstructure and the reflection or refraction of the third surface and the fourth surface, the light beam emitted by the light emitting element can be dispersed in a direction away from the optical axis of the light emitting element. Therefore, the phenomenon of uneven brightness on the light incident side can be improved.
Drawings
Fig. 1 is a schematic top view of a backlight module according to an embodiment of the invention.
Fig. 2 is a schematic cross-sectional view of a backlight module according to an embodiment of the invention.
Fig. 3 is a schematic perspective view of a microstructure according to an embodiment of the invention.
Fig. 4 is a schematic front view of the microstructure of fig. 3.
Fig. 5 is a schematic rear view of the microstructure of fig. 3.
Fig. 6 is a schematic side view of the microstructure of fig. 3.
Fig. 7 is a schematic top view of the microstructure of fig. 3.
FIG. 8 shows the optical path of a light beam delivered to a microstructure in accordance with an embodiment of the invention.
Fig. 9 is a schematic cross-sectional view of a backlight module according to another embodiment of the invention.
Fig. 10 is a schematic perspective view of a microstructure according to another embodiment of the invention.
Fig. 11 shows the path of a light beam through a microstructure according to another embodiment of the invention.
Fig. 12 is a schematic cross-sectional view of a backlight module according to another embodiment of the invention.
Fig. 13 is a schematic perspective view of a microstructure according to another embodiment of the invention.
Fig. 14 shows the path of light through a microstructure according to a further embodiment of the invention.
Fig. 15 is a schematic cross-sectional view of a backlight module according to still another embodiment of the invention.
Fig. 16 is a schematic perspective view of a microstructure according to still another embodiment of the invention.
Fig. 17 is a schematic front view of the microstructure of fig. 16.
Fig. 18 is a schematic rear view of the microstructure of fig. 16.
Fig. 19 is a side view of the microstructure of fig. 16.
Fig. 20 is a schematic top view of the microstructure of fig. 16.
List of reference numerals
10. 10A, 10B, 10C: backlight module
110: main body
112: bottom surface
114: light emitting surface
116: light incident surface
120. 120A, 120B, 120C: microstructure
121. 121A: first surface
121c, 121cA the first curved surface
122. 122A, 122B: second surface
122 a: arc surface
122c, 122cA, 122 cB: second curved surface
122 d: third curved surface
122 e: fourth curved surface
122 f: first connection surface
122 g: second connecting surface
122 p: plane surface
123. 123A: third surface
124. 124A: the fourth surface
130: cylindrical lens
140: light emitting element
b1, b2, c1, c 2: angle of rotation
C: center of a ship
d 1: a first direction
d 2: second direction
d 3: third direction
F: plane of symmetry
L, L1, L2: light beam
LED: light emitting diode
LGP: light guide element
X: optical axis
Detailed Description
The foregoing and other technical and scientific aspects, features and utilities of the present invention will be apparent from the following detailed description of the preferred embodiments, which is to be read in connection with the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are simply directions with reference to the drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting.
Fig. 1 is a schematic top view of a backlight module according to an embodiment of the invention. Fig. 2 is a schematic cross-sectional view of a backlight module according to an embodiment of the invention. It should be noted that FIG. 2 corresponds to the cross-sectional line of FIG. 1
And fig. 1 omits a lenticular lens (lens) 130 of fig. 2. In addition, for clarity, the first direction d1, the second direction d2 and the third direction d3 are perpendicular to each other.
Referring to fig. 1 and 2, the backlight module 10 includes a light guide element LGP and a light emitting element 140. The light guide element LGP is, for example, a light guide plate, and includes a body 110 and a plurality of microstructures 120. The main body 110 includes a bottom surface 112, a light-emitting surface 114 and a light-entering surface 116. The light-emitting surface 114 is disposed opposite to the bottom surface 112, and the light-emitting surface 114 is parallel to the bottom surface 112. The light incident surface 116 is connected between the light emitting surface 114 and the bottom surface 112, and the light incident surface 116 is perpendicular to the third direction d3, for example. The plurality of microstructures 120 are, for example, light scattering structures for dispersing light beams. The light emitting element 140 is disposed beside the light incident surface 116. In short, the backlight module 10 is a side-in type backlight module.
For example, in the present embodiment, the light emitting element 140 may include a plurality of light emitting diodes LEDs, and the plurality of light emitting diodes LEDs are spaced apart from each other in the first direction d1 parallel to the light incident surface 116. However, the invention is not limited thereto, and in other embodiments, the light emitting element 140 may be other types of light sources, such as a linear light source. In addition, in the embodiment, the light guide element LGP may further optionally include a cylindrical lens 130, wherein the cylindrical lens 130 is disposed on the light emitting surface 114 of the main body 110 and extends in a direction away from the light incident surface 116 (i.e., the third direction d 3). However, the present invention is not limited thereto, and in other embodiments, the lenticular lens 130 may be omitted, or the lenticular lens 130 may be changed to other types of optical structures.
Fig. 3 is a schematic perspective view of a microstructure according to an embodiment of the invention. Fig. 4 is a schematic front view of the microstructure of fig. 3. Fig. 5 is a schematic rear view of the microstructure of fig. 3. Fig. 6 is a schematic side view of the microstructure of fig. 3. Fig. 7 is a schematic top view of the microstructure of fig. 3. It should be noted that, for convenience of illustration and description, the microstructure 120 shown in fig. 3 to 7 is drawn to be complementary to the microstructure 120 shown in fig. 2.
Referring to fig. 1, fig. 2 and fig. 3, a plurality of microstructures 120 of the light guiding element LGP are recessed into the bottom surface 112 of the main body 110, and the plurality of microstructures 120 are, for example, recessed spaces. In the present embodiment, the plurality of microstructures 120 may be disposed on one side of the bottom surface 112 close to the light incident surface 116, for example, the region of the bottom surface 112 where the microstructures 120 are disposed is connected to the light incident surface 116 and has a width in the third direction d3 of 1-3 mm, and the microstructures 120 are not disposed in other regions of the bottom surface 112. In the present embodiment, the plurality of microstructures 120 may be selectively arranged in an array. However, the invention is not limited thereto, and in other embodiments, the plurality of microstructures 120 may be arranged in other manners. For example, in another embodiment, the plurality of microstructures 120 may be randomly dispersed on the bottom surface 112 near the light incident surface 116.
Referring to fig. 2, 3, 4 and 7, the recess space formed by each microstructure 120 includes a first surface 121. The first surface 121 includes a first curved surface 121c, and the first curved surface 121c is an arc surface and is curved toward the light incident surface 116 (i.e., a central point of the first curved surface 121c is closer to the light incident surface 116). The outer contour (refer to fig. 7, for example, a curved line) of the orthographic projection of the first curved surface 121c on the bottom surface 112 has a first radius of curvature, and the first radius of curvature is a fixed value. For example, in the present embodiment, the first radius of curvature may be between 6 μm and 30 μm.
Referring to fig. 2 and 3, the first direction d1 and the second direction d2 are perpendicular to each other and parallel to the light incident surface 116. In the present embodiment, the first curved surface 121c can be selectively curved in the first direction d1 and the second direction d 2. Specifically, in the present embodiment, the first curved surface 121c may be a concave surface complementary to a portion of a spherical surface, but the present invention is not limited thereto.
Referring to fig. 2, 3, 5, 6 and 7, each microstructure 120 further includes a second surface 122. The first surface 121 is disposed between the light incident surface 116 and the second surface 122. The second surface 122 includes a second curved surface 122c, and the second curved surface 122c is not connected to the first curved surface 121 c. The second curved surface 122c is an arc surface and is curved toward a direction away from the light incident surface 116 (i.e., the third direction d 3) (i.e., the central point of the second curved surface 122c is farther from the light incident surface 116), i.e., the curved directions of the first curved surface 121c and the second curved surface 122c are opposite. The orthographic outer contour of the second curved surface 122c on the bottom surface 112 (refer to fig. 7) has a second radius of curvature. The second radius of curvature is a fixed value. For example, in the present embodiment, the second radius of curvature may be between 6 μm and 30 μm.
Referring to fig. 3, fig. 5 and fig. 7, in the present embodiment, the second curved surface 122c may be selectively curved in the first direction d1 and not curved in the second direction d 2. Specifically, in the present embodiment, the second curved surface 122c is, for example, a concave surface complementary to a part of the outer peripheral surface of the cylinder, but the present invention is not limited thereto.
Referring to fig. 2, 3 and 5, a symmetry plane F is a virtual reference plane, and the symmetry plane F is perpendicular to the light incident surface 116 and the bottom surface 112. In the present embodiment, the microstructure 120 may be mirror-symmetrical with respect to the symmetry plane F, that is, the geometric center of the microstructure 120 is located on the symmetry plane F. In the present embodiment, the second surface 122 may further include two planes 122p having different inclination directions and connected to each other. Where the two planes 122p are connected
(indicated in fig. 5) is a straight line and lies on the plane of symmetry F. The two planes 122p are connected to form a recess in a direction away from the light incident surface 116 (i.e., the third direction d 3). Specifically, the second curved surface 122c is connected between the two flat surfaces 122p and the bottom surface 112 (shown in fig. 5).
Referring to fig. 2, 3, 4 and 7, each microstructure 120 further includes a third surface 123 and a fourth surface 124. The third surface 123 is connected between the first surface 121 and the second surface 122, and the third surface 123 is a plane. The fourth surface 124 is connected between the first surface 121 and the second surface 122, and the fourth surface 124 is a plane. Referring to fig. 2, 3 and 7, the symmetry plane F is perpendicular to the light incident surface 116 and the bottom surface 112 and passes through a center C (indicated in fig. 7, for example, a geometric center of an orthogonal projection profile) of an orthogonal projection profile of the microstructure 120 on the bottom surface 112. The third surface 123 and the fourth surface 124 are disposed opposite to each other with respect to a symmetry plane F, the bottom surface 112 is respectively connected to the first surface 121, the second surface 122, the third surface 123 and the fourth surface 124, and the symmetry plane F passes through the first curved surface 121c and the second curved surface 122 c.
Specifically, in the present embodiment, the third surface 123 and the fourth surface 124 are connected and inclined (not perpendicular and not parallel) with respect to the bottom surface 112 and the light incident surface 116, wherein the inclination directions of the third surface 123 and the fourth surface 124 with respect to the bottom surface 112 are different, and the connection position of the third surface 123 and the fourth surface 124 is different
(indicated in fig. 3) is a straight line and lies on the plane of symmetry F. Referring to fig. 2 and 3, in the present embodiment, the third surface 123 and the fourth surface 124 may be connected to be recessed in a direction away from the bottom surface 112 (e.g., a direction opposite to the second direction d 2).
Referring to fig. 2, 3 and 7, in the present embodiment, a third surface connecting line is disposed at a connection position of the third surface 123 and the bottom surface 112 of the microstructure 120
Third surface connecting line
Normal to the light-incident surface 116
(shown in FIG. 7) subtend an angle b1, and
(ii) a The junction of the fourth surface 124 and the bottom surface 112 of the microstructure 120 has a fourth surface connecting line
Fourth surface connecting line
Normal to the light-incident surface 116
With an angle b2, and
in the present embodiment, the angle b1 is equal to the angle b2, which provides good spectral symmetry.
Referring to fig. 3, fig. 6 and fig. 7, in the present embodiment, the second surface 122 may further include an arc surface 122a, the arc surface 122a is connected to the third surface 123 and the fourth surface 124, at least a portion of the arc surface 122a faces the light incident surface 116, and at least another portion of the arc surface 122a faces away from the light incident surface 116, specifically, the farthest position of the microstructure 120 from the bottom surface 112 is located on the arc surface 122a (for example, the center point of the arc surface 122a, but is not limited thereto). In the present embodiment, the arc surface 122a may be connected between one plane 122p of the second surface 122 and the third surface 123 and between the other plane 122p of the second surface 122 and the fourth surface 124. In the present embodiment, the width of the arc surface 122a in the direction perpendicular to the light incident surface 116 (i.e., the third direction d 3)
(shown in FIG. 7) may be the width of the microstructures 120 in the direction perpendicular to the light incident surface 116
(indicated in fig. 3) between 0.2 and 0.4 times. Specifically, the arc surface 122a has at least a portion facing the light incident surface 116 and is an arc surface, for example, to provide more reflection angles of the light beam L, so as to improve the light dispersion effect. The arc surface 122a has at least another portion facing away from the light incident surface 116 and is an arc surface, for example, to provide more refraction angles of the light beam L and to improve the light dispersion effect.
FIG. 8 shows the optical path of a light beam delivered to a microstructure in accordance with an embodiment of the invention. Referring to fig. 8, each light emitting element 140 has an optical axis X and is configured to emit a light beam L, the optical axis X is perpendicular to the light incident surface 116, for example, a part of the light beam L1 of the light beam L (the light beam L emitted by the light emitting element 140 corresponding to each microstructure 120. the light emitting element 140 corresponding to each microstructure 120 is, for example, the light emitting element 140 whose projection range on the light incident surface 116 and the projection range of the microstructure 120 overlap or are located around each other) is transmitted to the first surface 121 of the microstructure 120, and is sequentially refracted on the first surface 121 and the second surface 122 of the microstructure 120 to be transmitted in a direction away from the optical axis X. Another part of the light beam L2 is reflected by the third surface 123 and the fourth surface 124 of the microstructure 120 (the light beam L emitted by the non-corresponding light-emitting element 140 can be refracted by the third surface 123 and the fourth surface 124) to pass in a direction away from the optical axis X, and projections of the light beams L1 and L2 emitted by the light-emitting element 140 on the bottom surface 112 are, for example, parallel. Specifically, the average included angle between the light beam L1 refracted by the microstructure 120 and the optical axis X is smaller than the average included angle between the light beam L2 reflected by the microstructure 120 and the optical axis X. Therefore, the light beam L can be dispersed by the microstructures 120, so as to improve the uneven brightness of the backlight module 10 on the light incident side (i.e. the side of the main body 110 close to the light incident surface 116).
Referring to fig. 2, fig. 3, fig. 5, fig. 7 and fig. 8, in detail, in the present embodiment, the first curved surface 121c of the first surface 121 and the second curved surface 122c of the second surface 122 function like lens surfaces, so that a part of the light beam L1 of the light beam L diverges in a direction (small angle) away from the optical axis X; the two planes 122p of the second surface 122, which are inclined with respect to the incident surface 116 and the bottom surface 112, can refract a part of the light beam L1, so that a part of the light beam L1 passes through the two planes 122p and then respectively travels towards two sides of the optical axis X (with a small angle and a deflection in the second direction d 2); the third surface 123 and the fourth surface 124, which are inclined with respect to the light incident surface 116 and the bottom surface 112, can respectively reflect another part of the light beam L2 of the light beam L, so that another part of the light beam L2 of the light beam L is transmitted towards two sides of the optical axis X (with a large angle and with a deflection in the second direction d 2). Therefore, the microstructures 120 can disperse the light beam L in the first direction d1 and the second direction d2, thereby improving the uneven brightness of the backlight module 10 on the light incident side.
It should be noted that the following embodiments follow the reference numerals and parts of the contents of the foregoing embodiments, wherein the same reference numerals are used to indicate the same or similar elements, and the description of the same technical contents is omitted. For the description of the omitted portions, reference may be made to the foregoing embodiments, which will not be repeated below.
Fig. 9 is a schematic cross-sectional view of a backlight module according to another embodiment of the invention. Fig. 10 is a schematic perspective view of a microstructure according to another embodiment of the invention. It should be noted that, for convenience of illustration and description, the microstructure 120A shown in fig. 10 is drawn to be complementary to the microstructure 120A shown in fig. 9. Fig. 11 shows the path of light through a microstructure according to another embodiment of the invention.
Referring to fig. 9 and 10, the backlight module 10A and the microstructure 120A of the present embodiment are similar to the backlight module 10 and the microstructure 120, and the difference between them is: the type of the microstructure 120A of the present embodiment is different from the type of the microstructure 120 described above.
Referring to fig. 9 and 10, in detail, in the embodiment of fig. 9 and 10, the first curved surface 121cA of the microstructure 120A is bent in the first direction d1, but the first curved surface 121cA of the microstructure 120A is not bent in the second direction d 2. For example, the first curved surface 121cA of the microstructure 120A may be a concave surface complementary to a portion of the outer circumferential surface of the cylinder.
In the embodiments of fig. 9 and 10, the second surface 122A of the microstructure 120A includes a second curved surface 122cA (each section of the second curved surface 122cA is perpendicular to the bottom surface 112, for example), but does not include the two flat surfaces 122p and the circular arc surface 122A of fig. 3. In addition, in the present embodiment, the third surface 123A and the fourth surface 124A of the microstructure 120A are not connected and perpendicular to the bottom surface 112 and the light incident surface 116.
Referring to fig. 11, similarly, in the present embodiment, the first curved surface 121cA and the second curved surface 122cA of the microstructure 120A function similarly to a lens surface, and can make a part of the light beam L1 of the light beam L diverge (at a small angle) in a direction away from the optical axis X; another portion of the light beam L2 is refracted at the first surface 121A and the third surface 123A of the microstructure 120A, and is refracted at the first surface 121A and the fourth surface 124A of the microstructure 120A, respectively, to be dispersed (at a small angle) toward two sides of the optical axis X. Specifically, the average included angle between the light beam L1 refracted by the microstructure 120A and the optical axis X is smaller than the average included angle between the light beam L2 refracted by the microstructure 120A and the optical axis X. The microstructures 120A can also effectively disperse the light beam L in the first direction d1, and reduce the light beam L exiting from the light incident side of the light guide plate LGP, thereby improving the uneven brightness of the backlight module 10A at the light incident side. Specifically, in the present embodiment, the microstructures 120A are used to refract the light beam L emitted by the corresponding light emitting element 140, and do not reflect the light beam L emitted by the corresponding light emitting element 140 (or only reflect a small portion, and the ratio of the reflected light beams is less than 10%, for example).
Fig. 12 is a schematic cross-sectional view of a backlight module according to another embodiment of the invention. Fig. 13 is a schematic perspective view of a microstructure according to another embodiment of the invention. It should be noted that, for convenience of illustration and description, the microstructure 120B shown in fig. 13 is drawn to be complementary to the microstructure 120B shown in fig. 12. Fig. 14 shows the path of light through a microstructure according to a further embodiment of the invention.
Referring to fig. 12, 13 and 14, the backlight module 10B and the microstructure 120B of the present embodiment are similar to the backlight module 10A and the microstructure 120A, and the difference therebetween is: the second surface 122B of the microstructure 120B of the present embodiment is different from the second surface 122A of the microstructure 120A.
Specifically, in the present embodiment, the second surface 122B of the microstructure 120B also includes a second curved surface 122cB, and further includes a third curved surface 122d and a fourth curved surface 122e, wherein the third curved surface 122d and the fourth curved surface 122e are respectively disposed on two sides of the second curved surface 122cB and are curved toward a direction away from the light incident surface 116 (i.e., the third direction d 3) (each tangent plane of the third curved surface 122d and the fourth curved surface 122e is perpendicular to the bottom surface 112, for example). In the present embodiment, the third curved surface 122d is, for example, a concave surface complementary to a portion of the outer circumferential surface of the cylinder, and the fourth curved surface 122e is, for example, a concave surface complementary to a portion of the outer circumferential surface of the cylinder.
The third curved surface 122d and the fourth curved surface 122e are closer to the light incident surface 116 than the second curved surface 122 cB. Specifically, in the present embodiment, the second surface 122cB further includes a first connection surface 122F and a second connection surface 122g, wherein the first connection surface 122F is connected between the second curved surface 122cB and the third curved surface 122d, the second connection surface 122g is connected between the second curved surface 122cB and the fourth curved surface 122e, and the first connection surface 122F and the second connection surface 122g are parallel to the symmetry plane F.
In the present embodiment, the curvature radius of the third curved surface 122d and the fourth curved surface 122e is larger than the curvature radius of the second curved surface 122 cB. Therefore, the area of the second surface 122B of the microstructure 120B near the optical axis X can make the light beam L more divergent than the area far from the optical axis X (as shown in fig. 14), and the effect of the microstructure 120B on dispersing the light beam L can be further optimized.
Fig. 15 is a schematic cross-sectional view of a backlight module according to still another embodiment of the invention. Fig. 16 is a schematic perspective view of a microstructure according to still another embodiment of the invention. Fig. 17 is a schematic front view of the microstructure of fig. 16. Fig. 18 is a schematic rear view of the microstructure of fig. 16. Fig. 19 is a side view of the microstructure of fig. 16. Fig. 20 is a schematic top view of the microstructure of fig. 16. It should be noted that, for convenience of illustration and description, the microstructure 120C shown in fig. 16 to 20 is drawn to be complementary to the microstructure 120C shown in fig. 15.
The backlight module 10C and the microstructure 120C of the present embodiment are similar to the backlight module 10 and the microstructure 120, and the difference between them is: in the embodiment of fig. 15 to 20, the circular arc surface 122a of the microstructure 120C may be omitted, one of the two planes 122p of the third surface 123 and the second surface 122C may be directly connected, and the other of the two planes 122p of the fourth surface 124 and the second surface 122C may be directly connected.
Referring to fig. 15 to 20, in detail, in the present embodiment, one of the two planes 122p of the third surface 123 and the second surface 122C has a first cross-connection line
First cross-over line
(shown in FIG. 17) at an angle c1 with respect to the bottom surface 112, and
(ii) a The other of the two planes 122p of the fourth surface 124 and the second surface 122C has a second intersection line
(shown in FIG. 17), a second interface line
At an angle c2 with the bottom surface 112, and
。
in addition, in the present embodiment, the second curved surface 122cC of the microstructure 120C is curved in the first direction d1 and the second direction d 2. The second curved surface 122cC of the microstructure 120C is, for example, a concave surface complementary to a part of the surface of the sphere.
In summary, the light guide element of the backlight module according to an embodiment of the invention includes a plurality of microstructures recessed into the bottom surface of the main body of the light guide element. Each microstructure comprises a first surface, a light incoming surface and a first curved surface. Each microstructure comprises a second surface, a light incident surface and a second curved surface. Each microstructure comprises a third surface, which is connected between the first surface and the second surface and is a plane. Each microstructure comprises a fourth surface which is connected between the first surface and the second surface and is a plane.
By means of the refraction effect of the first curved surface and the second curved surface of the microstructure and the reflection or refraction effect of the third surface and the fourth surface, the light beam emitted by the light-emitting element can be dispersed towards the direction far away from the optical axis of the light-emitting element. Therefore, the light mixing of the backlight module on the light incident side is more uniform, and the phenomenon of uneven brightness can be improved. Even if the light splitting microstructures are arranged on the light incident surface of the light guide element, the phenomenon of uneven brightness on the light incident side can be improved, in other words, the light splitting microstructures arranged on the light incident surface can be microstructures with excellent light splitting effect (for example, a plurality of triangular columns with vertex angles are arranged on the whole light incident surface) so as to improve the light splitting efficiency, and light mixing is carried out by the microstructures arranged on the bottom surface of the light guide element, so that the light mixing of the backlight module on the light incident side can be further more uniform, and the phenomenon of uneven brightness can be improved.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention should not be limited thereby, and all the simple equivalent changes and modifications made according to the claims and the content of the specification should be included in the scope of the present invention. It is not necessary for any embodiment or claim of the invention to achieve all of the objects or advantages or features disclosed herein. Furthermore, the abstract and the title of the specification are provided only for assisting the retrieval of patent documents and are not intended to limit the scope of the present invention. Furthermore, the terms "first," "second," and the like, as used herein or in the appended claims, are used merely to name elements (elements) or to distinguish one embodiment or range from another, and are not intended to limit the upper or lower limit on the number of elements.
Claims (14)
1. A light guide element comprises a main body and a plurality of microstructures, wherein
The main body comprises a bottom surface, a light emergent surface and a light incident surface
The light-emitting surface is arranged opposite to the bottom surface; and
the light incident surface is connected between the light emergent surface and the bottom surface; and
a plurality of the microstructures are recessed into the bottom surface of the body, wherein each of the microstructures comprises a first surface, a second surface, a third surface, and a fourth surface, wherein
The first surface comprises a first curved surface, the first curved surface is an arc surface and is bent towards the light incident surface, the outline of the orthographic projection of the first curved surface on the bottom surface is only a curve and has a first curvature radius, the first curvature radius is a fixed value, the first curvature radius is between 6um and 30um, the geometric center of each of the microstructures is positioned on a symmetrical plane, and the symmetrical plane is perpendicular to the light incident surface and the bottom surface; the first curved surface is bent in a first direction and is not bent in a second direction, the first direction is parallel to the light incident surface and the light emergent surface, and the second direction is perpendicular to the first direction and is parallel to the light incident surface;
the second surface comprises a second curved surface, wherein the second curved surface is not connected with the first curved surface, the second curved surface is an arc surface and is bent towards a direction far away from the light incident surface, the outline of the orthographic projection of the second curved surface on the bottom surface has a second curvature radius, the second curvature radius is a fixed value, and the first surface of each of the microstructures is arranged between the light incident surface and the second surface of the microstructure;
the third surface is connected between the first surface and the second surface, wherein the third surface is a plane; and
the fourth surface is connected between the first surface and the second surface, wherein the fourth surface is a plane, the third surface and the fourth surface are arranged opposite to a symmetry plane, the symmetry plane is perpendicular to the light incident surface and the bottom surface and passes through the center of an orthographic projection profile of the microstructure on the bottom surface, the bottom surface is respectively connected with the first surface, the second surface, the third surface and the fourth surface, the symmetry plane passes through the first curved surface and the second curved surface, the third surface and the fourth surface are connected and inclined relative to the bottom surface and the light incident surface, the inclination directions of the third surface and the fourth surface relative to the bottom surface are different, and the connection part of the third surface and the fourth surface is a straight line and is positioned on the symmetry plane.
2. A light directing element according to claim 1, wherein the second radius of curvature is between 6 μm and 30 μm.
3. A light guide element according to claim 1, wherein the second surface further comprises two planes with different tilt directions and connected to each other, the connection between the two planes is a straight line and located on the symmetry plane, and the second curved surface is connected between the two planes and the bottom surface.
4. A light-directing element as recited in claim 3, wherein one of the two planes of the third surface and the second surface has a first line of intersection that makes an angle c1 with the bottom surface, and
。
5. a light-directing element according to claim 4, wherein one of said two planes of said fourth surface and said second surface has a second line of intersection which makes an angle c2 with said bottom surface, and
。
6. a light guide element according to claim 1, wherein a junction between the third surface and the bottom surface of the microstructure has a third surface connecting line, and the third surface connecting line and the normal of the light incident surface form an angle b1, and
。
7. a light guide element according to claim 6, wherein a junction between the fourth surface and the bottom surface of the microstructure has a fourth surface connecting line, the fourth surface connecting line and the normal of the light incident surface form an angle b2, and
。
8. a light guide element comprises a main body and a plurality of microstructures, wherein
The main body comprises a bottom surface, a light emergent surface and a light incident surface, wherein
The light-emitting surface is arranged opposite to the bottom surface; and
the light incident surface is connected between the light emergent surface and the bottom surface; and
a plurality of the microstructures are recessed into the bottom surface of the body, wherein each of the microstructures comprises a first surface, a second surface, a third surface, and a fourth surface, wherein
The first surface comprises a first curved surface, the first curved surface is an arc surface and is bent towards the light incident surface, the outline of the orthographic projection of the first curved surface on the bottom surface is only a curve and has a first curvature radius, the first curvature radius is a fixed value, the first curvature radius is between 6um and 30um, the geometric center of each of the microstructures is positioned on a symmetrical plane, and the symmetrical plane is perpendicular to the light incident surface and the bottom surface; the first curved surface is bent in a first direction and is not bent in a second direction, the first direction is parallel to the light incident surface and the light emergent surface, and the second direction is perpendicular to the first direction and is parallel to the light incident surface;
the second surface comprises a second curved surface, a third curved surface and a fourth curved surface, wherein the second curved surface is not connected with the first curved surface, the second curved surface is a cambered surface and is bent towards the direction far away from the light incident surface, the outline of the orthographic projection of the second curved surface on the bottom surface has a second curvature radius, the second curvature radius is a fixed value, the first surface of each of the microstructures is arranged between the light incident surface and the second surface of each of the microstructures, the third curved surface and the fourth curved surface are respectively arranged on two sides of the second curved surface and are bent towards the direction far away from the light incident surface, and the third curved surface and the fourth curved surface are closer to the light incident surface than the second curved surface;
the third surface is connected between the first surface and the second surface, wherein the third surface is a plane; and
the fourth surface is connected between the first surface and the second surface, wherein the fourth surface is a plane, the third surface and the fourth surface are arranged opposite to a symmetry plane, the symmetry plane is perpendicular to the light incident plane and the bottom plane and passes through the center of an orthographic projection profile of the microstructure on the bottom plane, the bottom plane is respectively connected with the first surface, the second surface, the third surface and the fourth surface, the symmetry plane passes through the first curved surface and the second curved surface, and the third surface and the fourth surface are perpendicular to the bottom plane and the light incident plane.
9. The light guide element of claim 1, wherein the second surface further includes an arc surface, the arc surface is connected to the third surface and the fourth surface, at least one portion of the arc surface faces the light incident surface, at least another portion of the arc surface faces away from the light incident surface, and a width of the arc surface in a direction perpendicular to the light incident surface is between 0.2 times and 0.4 times a width of the microstructure in the direction perpendicular to the light incident surface.
10. A light directing element according to claim 8, wherein at least one of the third curved surface and the fourth curved surface has a radius of curvature greater than a radius of curvature of the second curved surface.
11. A light directing element according to claim 8, wherein the second surface of each of the microstructures further comprises:
the first connecting surface is connected between the second curved surface and the third curved surface, the second connecting surface is connected between the second curved surface and the fourth curved surface, and the first connecting surface and the second connecting surface are parallel to the symmetrical surface.
12. A backlight module comprises a light guide element and at least one light emitting element
The light guide element comprises a main body and a plurality of microstructures, wherein
The main body comprises a bottom surface, a light emergent surface and a light incident surface, wherein
The light-emitting surface is arranged opposite to the bottom surface; and
the light incident surface is connected between the light emergent surface and the bottom surface; and
a plurality of the microstructures recessed into the bottom surface of the body, wherein each of the microstructures comprises a first surface, a second surface, a third surface, and a fourth surface, wherein
The first surface deviates from the light incident surface and comprises a first curved surface, wherein the first curved surface is an arc surface and is recessed towards the light incident surface, the outline of the orthographic projection of the first curved surface on the bottom surface is only a curve and has a first curvature radius, the first curvature radius is a fixed value, the first curvature radius is between 6um and 30um, the geometric center of each of the microstructures is positioned on a symmetrical plane, and the symmetrical plane is perpendicular to the light incident surface and the bottom surface; the first curved surface is bent in a first direction and is not bent in a second direction, the first direction is parallel to the light incident surface and the light emergent surface, and the second direction is perpendicular to the first direction and is parallel to the light incident surface;
the second surface faces the light incident surface and comprises a second curved surface, the second curved surface is not connected with the first curved surface, the second curved surface is an arc surface and is concave towards the direction far away from the light incident surface, the outline of the orthographic projection of the second curved surface on the bottom surface has a second curvature radius, the second curvature radius is a fixed value, and the first surface of each of the microstructures is arranged between the light incident surface and the second surface of the microstructure;
the third surface connects the first surface and the second surface, wherein the third surface is a plane; and
the fourth surface is connected to the first surface and the second surface, wherein the fourth surface is a plane, the third surface and the fourth surface are arranged opposite to a symmetry plane, the symmetry plane is perpendicular to the light incident surface and the bottom surface and passes through the center of an orthographic projection profile of the microstructure on the bottom surface, the bottom surface is respectively connected with the first surface, the second surface, the third surface and the fourth surface, the symmetry plane passes through the first curved surface and the second curved surface, the third surface and the fourth surface are connected and inclined relative to the bottom surface and the light incident surface, the inclination directions of the third surface and the fourth surface relative to the bottom surface are different, and the connection position of the third surface and the fourth surface is a straight line and is positioned on the symmetry plane; and
the at least one light-emitting element is arranged beside the light incident surface.
13. The backlight module of claim 12, wherein the at least one light emitting element has at least one optical axis and is configured to emit at least one light beam; at least one part of the at least one light beam is refracted on the first surface and the second surface of the microstructure in sequence to transmit in a direction away from the at least one optical axis; at least another part of the at least one light beam is reflected at the third surface and the fourth surface of the microstructure to pass in a direction away from the at least one optical axis.
14. The backlight module of claim 12, wherein the third surface is perpendicular to the bottom surface and the light incident surface, and the at least one light emitting element has at least one optical axis and is configured to emit at least one light beam; at least a portion of the at least one light beam is refracted at the first surface and the third surface of the microstructure in sequence to disperse in a direction away from the at least one optical axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210450931.6A CN114563839B (en) | 2022-04-27 | 2022-04-27 | Light guide element and backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210450931.6A CN114563839B (en) | 2022-04-27 | 2022-04-27 | Light guide element and backlight module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114563839A CN114563839A (en) | 2022-05-31 |
| CN114563839B true CN114563839B (en) | 2022-09-13 |
Family
ID=81721595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210450931.6A Active CN114563839B (en) | 2022-04-27 | 2022-04-27 | Light guide element and backlight module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114563839B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102981207A (en) * | 2011-09-06 | 2013-03-20 | 扬升照明股份有限公司 | Light guide plate and backlight module |
| CN104748071A (en) * | 2013-12-31 | 2015-07-01 | 奇美实业股份有限公司 | Light guide plate for illumination and illumination lamp |
| TWI752721B (en) * | 2020-11-10 | 2022-01-11 | 誠屏科技股份有限公司 | Light guide plate and light source device |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6752505B2 (en) * | 1999-02-23 | 2004-06-22 | Solid State Opto Limited | Light redirecting films and film systems |
| TW200632455A (en) * | 2005-03-01 | 2006-09-16 | Wintek Corp | Light guide plate |
| JP5396498B2 (en) * | 2012-03-02 | 2014-01-22 | 株式会社エス・ケー・ジー | Light emitting device |
| TWI539211B (en) * | 2012-04-30 | 2016-06-21 | 中強光電股份有限公司 | Light guide plate and backlight module using the same |
| CN104848052A (en) * | 2014-02-13 | 2015-08-19 | 扬升照明股份有限公司 | Backlight module |
| JP6213295B2 (en) * | 2014-02-20 | 2017-10-18 | オムロン株式会社 | Reflective structure, light guide, light emitting device, and game machine |
| US9851488B2 (en) * | 2014-08-18 | 2017-12-26 | New Optics, Ltd | Light guide plate and backlight unit including the same |
| US20160047973A1 (en) * | 2014-08-18 | 2016-02-18 | New Optics, Ltd | Light guide plate, and backlight unit and display device including the same |
| US20180088270A1 (en) * | 2016-09-29 | 2018-03-29 | Amazon Technologies, Inc. | Lightguide assembly for electronic display |
| WO2018174646A1 (en) * | 2017-03-23 | 2018-09-27 | (주)아이에스엘 | Light guide plate for transparent display having fine refractive groove formed through imprinting method, transparent display device comprising same, and method for manufacturing same |
| CN213517809U (en) * | 2020-11-12 | 2021-06-22 | 台湾扬昕股份有限公司 | Light guide element and backlight module |
| CN113655558B (en) * | 2021-09-02 | 2022-08-05 | 扬昕科技(苏州)有限公司 | Light guide plate and backlight module |
-
2022
- 2022-04-27 CN CN202210450931.6A patent/CN114563839B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102981207A (en) * | 2011-09-06 | 2013-03-20 | 扬升照明股份有限公司 | Light guide plate and backlight module |
| CN104748071A (en) * | 2013-12-31 | 2015-07-01 | 奇美实业股份有限公司 | Light guide plate for illumination and illumination lamp |
| TWI752721B (en) * | 2020-11-10 | 2022-01-11 | 誠屏科技股份有限公司 | Light guide plate and light source device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114563839A (en) | 2022-05-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8388207B2 (en) | Illuminating device and display device having the same | |
| EP1662279B1 (en) | Prism sheet and backlight unit employing the same | |
| US8414162B2 (en) | Light guide and light-output device | |
| US7452093B2 (en) | Prism sheet and display device using the same | |
| JPWO2007123173A1 (en) | Diffuser and surface light source device | |
| WO2010070823A1 (en) | Planar light source device | |
| TWI761599B (en) | Grating-coupled light guide, display system, and method employing optical concentration | |
| CN107101178B (en) | Light guide assembly and lighting and/or signalling device | |
| TW201344307A (en) | Light guide plate and backlight module using the same | |
| KR20010086401A (en) | Illumination system using edge-illuminated hollow waveguide and lenticular optical structures | |
| KR20070058492A (en) | Methods of cutting or forming cavities in a substrate for use in making optical films, components or wave guides | |
| KR101690740B1 (en) | Asymmetric light diffusion lens | |
| TWI498643B (en) | Display device | |
| US20160202409A1 (en) | Double-sided optical film with lenslets and clusters of prisms | |
| EP2279374B1 (en) | Optical element for asymmetric light distribution | |
| US8220979B2 (en) | Light guide plate and backlight module | |
| US10725212B2 (en) | Lens | |
| KR100733110B1 (en) | Illumination system having edge-illuminated waveguide and separate components for extracting and directing light | |
| US8439548B2 (en) | Symmetric serrated edge light guide having circular base segments | |
| CN114563839B (en) | Light guide element and backlight module | |
| KR20050085345A (en) | Light deflector and light source device | |
| CN113655559B (en) | Light-collecting light guide plate and display device | |
| US20130003408A1 (en) | Symmetric serrated edge light guide film having circular tip and base segments | |
| JP6751452B2 (en) | Area lighting device | |
| CN218273011U (en) | Backlight module and light guide plate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |