CN114089464B - Light guide plate with gradual change microstructure and light source module thereof - Google Patents
Light guide plate with gradual change microstructure and light source module thereof Download PDFInfo
- Publication number
- CN114089464B CN114089464B CN202210064774.5A CN202210064774A CN114089464B CN 114089464 B CN114089464 B CN 114089464B CN 202210064774 A CN202210064774 A CN 202210064774A CN 114089464 B CN114089464 B CN 114089464B
- Authority
- CN
- China
- Prior art keywords
- microstructures
- light
- guide plate
- light guide
- light source
- 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
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
Abstract
The invention provides a light guide plate with a gradually-changed microstructure, which comprises a light emergent surface, a bottom surface, a light incident surface and a plurality of first microstructures. The light incident surface is connected with the light emergent surface and the bottom surface. The plurality of first microstructures are arranged on the light-emitting surface and extend along the first direction and are arranged along the second direction. The outer side included angle between the first microstructures and the light emitting surface is increased along with the distance from the center of the light guide plate, and the inner side included angle between the first microstructures and the light emitting surface is a fixed value. The first microstructures respectively have a width along the second direction, and the widths decrease with distance from the center of the light guide plate. Each first microstructure has a height relative to the light-emitting surface, and the heights are fixed values. The invention also provides a light source module. The light guide plate with the gradual change microstructure and the light source module can improve the integral uniformity of pictures and improve the influence of dark bands on the display quality of the light source module.
Description
Technical Field
The present invention relates to an optical device and a surface light source, and more particularly, to a light guide plate with a graded microstructure and a light source module.
Background
A typical lcd mainly comprises a backlight module and a liquid crystal panel. Since the liquid crystal panel does not emit light, a backlight module is required to provide a light source for display.
Generally, the backlight module can be divided into a direct type backlight module and a side-incident type backlight module. Taking the side-incident backlight module as an example, a light beam provided by a light source disposed on the light incident surface of the light guide plate is transmitted inside the light guide plate, and an optical microstructure (such as an etching pattern or a screen printing pattern) at the bottom of the light guide plate destroys the total reflection of the light beam, so that the light beam is guided to the light emergent surface of the light guide plate to emit light, thereby forming a surface light source. However, in the side-light-entering type backlight module, there is a difference between the side luminance and the center luminance in the two side regions, so that the bright-dark contrast is generated between the two sides and the center of the backlight module to form a dark band, which affects the display quality.
The background section is only provided to aid in understanding the present disclosure, and thus the disclosure in the background section may include some prior art that does not constitute a part of the knowledge of one skilled in the art. The disclosure in the "background" section does not represent a representation of the disclosure or the problems that may be solved by one or more embodiments of the present invention, but is known or appreciated by those skilled in the art prior to the filing of the present application.
Disclosure of Invention
The invention provides a light guide plate with a gradually-changed microstructure and a light source module, which can improve the integral uniformity of a picture and improve the influence of a dark band on the display quality of the light source module.
Other objects and advantages of the present invention will be further understood from the technical features disclosed in the present invention.
In order to achieve one or a part of or all of the above or other objects, the present invention provides a light guide plate with a gradually changing microstructure, including a light emitting surface, a bottom surface, a light incident surface and a plurality of first microstructures. The bottom surface is back to back with the light-emitting surface. The light incident surface is connected with the light emergent surface and the bottom surface. The plurality of first microstructures are arranged on the light-emitting surface. Each of the plurality of first microstructures extends along a first direction, and the plurality of first microstructures are arranged along a second direction. The first direction is perpendicular to the light incident surface and the second direction. Each of the first microstructures has an inner side included angle and an outer side included angle with the light emitting surface. Wherein the inner included angle of each of the plurality of first microstructures is closer to the center of the light guide plate than the outer included angle. The angles of the outer included angles of the first microstructures are increased along with the distance from the center of the light guide plate, and the angles of the inner included angles of the first microstructures are fixed values. Each of the first microstructures has a width along the second direction, the widths of the first microstructures decrease with distance from the center of the light guide plate, each of the first microstructures has a height relative to the light emitting surface, and the heights of the first microstructures are fixed values.
In order to achieve one or a part of or all of the above or other objects, the present invention provides a light source module, which includes a light guide plate having a graded microstructure and a light source. The light guide plate comprises a light emitting surface, a bottom surface, a light incident surface and a plurality of first microstructures. The bottom surface is opposite to the light-emitting surface. The light incident surface is connected with the light emergent surface and the bottom surface. The plurality of first microstructures are arranged on the light-emitting surface. Each of the plurality of first microstructures extends along a first direction, and the plurality of first microstructures are arranged along a second direction. The first direction is perpendicular to the light incident surface and the second direction. Each of the first microstructures has an inner side included angle and an outer side included angle with the light emitting surface. Wherein the inner included angle of each of the plurality of first microstructures is closer to the center of the light guide plate than the outer included angle. The angles of the outer included angles of the first microstructures are increased along with the distance from the center of the light guide plate, and the angles of the inner included angles of the first microstructures are fixed values. Each of the first microstructures has a width along the second direction, the widths of the first microstructures decrease with distance from the center of the light guide plate, each of the first microstructures has a height relative to the light emitting surface, and the heights of the first microstructures are fixed values. The light source is used for providing a light beam. The light source is arranged beside the light incident surface of the light guide plate, so that light beams can enter the light guide plate from the light incident surface.
Based on the above, the embodiments of the invention have at least one of the following advantages or efficacies. In the light source module or the light guide plate, the structural design of the first microstructures can increase the brightness of the light source module at two sides, so that the integral uniformity of a picture is improved. In addition, the embodiment of the invention can maintain the average brightness of the central area of the picture while increasing the brightness of the light source module at two sides. Therefore, the average brightness of the whole picture area can be increased, and the efficiency of the light source module is improved.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1A is a schematic top view of a light source module according to an embodiment of the invention.
Fig. 1B is a cross-sectional view of the light source module of the embodiment of fig. 1A.
Fig. 1C is a schematic cross-sectional view of a light guide plate of the light source module in the embodiment of fig. 1A.
Fig. 2 is a schematic optical path diagram of a light guide plate according to an embodiment of the invention.
Fig. 3A to 3C are schematic views of a first microstructure according to different embodiments of the present invention.
Fig. 4 to 6 are schematic cross-sectional views of light guide plates of light source modules according to different embodiments of the invention.
List of reference numerals
10: light source module
100. 100a, 100b, 100 c: light guide plate
100M: center of a ship
110: light emitting surface
120: bottom surface
130: light incident surface
140、
、
、
、
、
140a, 140b, 140c, 140d, 140 e: first microstructure
140S: first microstructure surface
140 SA: inner side surface
140 SB: outer side surface
140SB 1: first surface
140SB 2: second surface
150: second microstructure
200: light source
210: light-emitting element
300: reflector plate
400: optical film
C1: first curved surface
C2: second curved surface
CA: central zone
D1: a first direction
D2: second direction
H: height
I: light beam
PA: edge zone
W、 
、
、
: width of
X: inner side
Y: outside side
α、
、
、
、
、
: inner side included angle
β、
、
、
、
、
、
: the outer angle.
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 a preferred embodiment when read in conjunction 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 used is intended to be illustrative and is not intended to be limiting.
Fig. 1A is a schematic top view of a light source module according to an embodiment of the invention. Fig. 1B is a cross-sectional view of the light source module of the embodiment of fig. 1A. Fig. 1C is a schematic cross-sectional view of a light guide plate of the light source module in the embodiment of fig. 1A. Please refer to fig. 1A and fig. 1B. FIG. 1B is a schematic view of the light source module 10 of FIG. 1A
A schematic cross-section of a line. The light source module 10 includes a light guide plate 100 having a graded microstructure and a light source 200. The light guide plate 100 includes a light emitting surface 110, a bottom surface 120, a light incident surface 130, and a plurality of first microstructures 140. The bottom surface 120 faces away from the light emitting surface 110. The light incident surface 130 connects the light emitting surface 110 and the bottom surface 120. The light guide plate 100 is made of a light-permeable material such as polymethyl methacrylate (PMMA) or Polycarbonate (PC).
The light source 200 is used to provide a light beam I. In the present embodiment, the light source 200 is disposed beside the light incident surface 130 of the light guide plate 100, so that the light beam I can enter the light guide plate 100 from the light incident surface 130. In the present embodiment, the light source 200 may include a plurality of light emitting elements 210, and the light emitting elements 210 are arranged beside the light incident surface 130 along the second direction D2. The light emitting device 210 is, for example, but not limited to, a light emitting diode. In another embodiment, the light emitting elements 210 can be replaced by lamps. In order to clearly illustrate the structural features of the light source module, fig. 1A only illustrates the light guide plate 100 and the light source 200 of the light source module 10, and other elements are omitted.
The plurality of first microstructures 140 are disposed on the light emitting surface 110. Each of the plurality of first microstructures 140 extends along the first direction D1, and the plurality of first microstructures 140 are arranged along the second direction D2. The first direction D1 is parallel to the normal direction of the light incident surface 130, in other words, the first direction D1 is perpendicular to the light incident surface 130. The second direction D2 is perpendicular to the first direction D1. That is to say, the first microstructures 140 are disposed in a plurality of stripe structures on the light emitting surface 110 of the light guide plate 100, and the first microstructures 140 extend from the light incident surface 130 to a side surface (not labeled) opposite to the light incident surface 130, and are arranged on the light emitting surface 110 from one side edge of the light incident surface 130 to the other side edge of the light incident surface 130. In other embodiments, the light guide plate 100 further includes two opposite side surfaces (not shown), which are respectively connected to the light emitting surface 110, the bottom surface 120, the light incident surface 130, and the opposite side surfaces. The first microstructures 140 are arranged on the light emitting surface 110 from a side edge where the light emitting surface 110 is connected to one of the two side surfaces to a side edge where the light emitting surface 110 is connected to the other of the two side surfaces. In the present embodiment, the plurality of first microstructures 140 is integrally formed with the light guide plate 100.
Please refer to fig. 1A to fig. 1C. FIG. 1C is a schematic view of the light guide plate 100 shown in FIG. 1A
A schematic cross-section of a line. As shown in fig. 1C, the plurality of first microstructures 140 are disposed on the light emitting surface 110 of the light guide plate 100. In the present embodiment, the plurality of first microstructures 140 includes a first microstructure
The first microstructure
A first microstructure
…, and a first microstructure
A first microstructure
…, etc. The present invention is not limited to the number of the first microstructures 140, and those skilled in the art can adjust the number of the first microstructures 140 disposed on the light guide plate 100 according to the design requirement of the actual product and referring to the teaching of the present embodiment. The light guide plate 100 includes a center 100M. The center 100M of the light guide plate may be located at the center of the light guide plate 100 in the second direction D2, or near the center of the light guide plate 100 in the second direction D2. Light beams from the light source may enter the light guide plate 100 along the first direction D1. In some embodiments, the plurality of first microstructures 140 may be symmetrical to the center 100M of the light guide plate 100.
As shown in fig. 1C, each of the plurality of first microstructures 140 has a triangular prism shape, for example. Each of the first microstructures 140 has an inner angle α and an outer angle β with the light emitting surface 110; in each of the first microstructures 140, the inner angle α is closer to the middle of the light guide plate 100 than the outer angle βCore 100M. As shown in fig. 1C, a first microstructure
With inner angle
And outside included angle
(ii) a First microstructure
With inner angle
And outside included angle
(ii) a And so on. In detail, each of the plurality of first microstructures 140 has a first microstructure surface 140S, and each of the plurality of first microstructures 140S has an inner side (not labeled) and an outer side (not labeled) opposite to each other. First microstructure
The inner side surface and the outer side surface of the first microstructure surface 140S may respectively intersect with the light emitting surface 110 of the light guide plate 100 at an inner side X and an outer side Y, wherein the inner side X is closer to the center 100M of the light guide plate 100 than the outer side Y. First microstructure
The included angle between the tangent plane of the first microstructure surface 140S at the inner side X and the light emitting surface 110 is an inner side included angle
(ii) a First microstructure
The included angle between the tangent plane of the first microstructure surface 140S at the outer side Y and the light-emitting surface 110 is an outer side clampCorner
(ii) a And so on. In the present embodiment, the plurality of first microstructures 140 further includes a first microstructure located at the center 100M of the light guide plate 100
Wherein the first microstructure is located at the center 100M of the light guide plate 100
The inner side surface and the outer side surface of the first microstructure surface 140S may respectively form an included angle with the light emitting surface 110 of the light guide plate 100 at the same angle
That is to say the first microstructure
Is an isosceles triangle. In other embodiments, the first microstructures are located at the center 100M of the light guide plate 100 and located at two adjacent first microstructures
, 
Adjacent to (3).
In the present embodiment, the included angle β between the outer sides of the first microstructures 140 increases with distance from the center 100M of the light guide plate. In other words, the first microstructure farther from the center 100M
Outside included angle of
Is larger than the first microstructure
Outside included angle of
Angle of (2), first microstructure further from the center 100M
Outside included angle of
Is larger than the first microstructure
Outside included angle of
The first microstructure further from the center 100M
Outside included angle of
Is larger than the first microstructure
Outside included angle of
Angle of (2), first microstructure further from the center 100M
Outside included angle of
Is larger than the first microstructure
Outside included angle of
In the same way, and so on. That is, as the distance between the first microstructures 140 and the center 100M of the light guide plate increases, the angle of the bottom angle of the first microstructures 140 away from the center side increases. On the other hand, the angle of the inside included angle α of the plurality of first microstructures 140 is a fixed value. In other words, the first microstructure
Inner side included angle of
A first microstructure
Inner side included angle of
.., and a first microstructure
Inner side included angle of
A first microstructure
Inner side included angle of
.., etc., all at the same angle. By the structural design of the plurality of first microstructures 140, the angle and brightness of the light beam I emitted through the inner side of each first microstructure 140 can be maintained, and the angle of the light beam I emitted through the outer side of each first microstructure 140 can be changed, so that the light-emitting opening angles at different positions on the light source module 10 can be controlled, the luminance of the light source module 10 at two sides (for example, two opposite sides in the second direction D2) can be increased, the problem of dark bands at two sides of the light source module 10 can be solved, and the overall uniformity of the picture can be improved. In addition, the embodiment of the invention increases the brightness of the light source module 10 on both sidesWhile maintaining the average luminance of the central region of the frame (e.g., the middle portion of the two opposite sides in the second direction D2). Therefore, the average luminance of the whole screen area can be increased, and the efficiency of the light source module 10 can be improved.
In another embodiment, the light guide plate 110 further includes blank regions (not shown) located at two ends of the light emitting surface in the second direction D2. The light-emitting surface 110 may have a blank region near the side edge connected to the two side surfaces, that is, the blank region does not have the first microstructures 140. Since the first microstructures 140 can increase the luminance of the light source module at two sides (e.g., two opposite sides in the second direction D2), when the light source module 10 further includes a plastic frame or a back plate surrounding the light guide plate 100, the plastic frame and the back plate reflect the light emitted from the light emitting surface 110 and the first microstructures 140 at the side edge portion connected to the two side surfaces toward the two sides of the light guide plate 100, so that the light source module 10 generates edge bright lines at the two side portions of the light guide plate 100, thereby affecting the visual perception. Therefore, the brightness of the light guide plate 100 near the plastic frame or the back plate can be reduced through the white space on the light emitting surface 110 near the side edge connected to the two side surfaces, and the edge bright lines are avoided.
Please continue to refer to fig. 1C. In the present embodiment, each of the plurality of first microstructures 140 has a width W along the second direction D2, and the width W of the plurality of first microstructures 140 decreases with distance from the center 100M of the light guide plate 100. In the present embodiment, the first microstructure farther from the center 100M
Width of (2)
Smaller than the first microstructure
Width of (2)
First micro-junction farther from center 100MStructure of the organization
Width of (2)
Smaller than the first microstructure
Width of (2)
,., and so on. This feature of the first microstructure 140 can help to improve the brightness of the light source module at both sides.
In addition, in some embodiments of the invention, each of the plurality of first microstructures 140 has a height H relative to the light emitting surface 110, and the height H of the plurality of first microstructures 140 is a fixed value. In other words, the heights H of the plurality of first microstructures 140 are substantially the same. In some embodiments, a plurality of first microstructures 140 (first microstructures)
A first microstructure
A first microstructure
…, and a first microstructure
A first microstructure
…, etc.) falls within the range of 0 millimeters to 0.2 millimeters.
In some embodiments of the present invention, the included angle α (e.g., included angle α) of the first microstructures 140 is smaller than the included angle α of the first microstructures
Inner side included angle
.., and inner angle
Inner side included angle
.., etc.) and an angle beta (e.g., an angle beta)
Outer side included angle
Outer side included angle
.., and outside angle
Outer side included angle
.., etc.) falls within the range of 0 to 80 degrees. In some embodiments, the angle difference between the included angles β of the outer sides of any two adjacent first microstructures 140 in the plurality of first microstructures 140 is in the range of 0 to 10 degrees. For example, adjacent first microstructures
And a first microstructure
Outside included angle
Angle with the outside
The angle difference of (a) falls within the range of 0 to 10 degrees. In some embodiments, the angle difference between the outer angles β of the adjacent first microstructures 140 is constant, and the angles of the outer angles β of the plurality of first microstructures 140 form an equal-difference sequence, wherein the first microstructures have different angles
Outside included angle of
According to the conditional formula:
where n is an integer and x can fall within the range of 0 to 10 degrees. However, in other embodiments, the angle difference between the outer angles β of the adjacent first microstructures 140 may not be constant, and the invention is not limited thereto.
As shown in fig. 1C, in the present embodiment, the plurality of first microstructures 140 are continuously disposed on the light emitting surface 110, that is, the interval between the plurality of first microstructures 140 in the second direction D2 is substantially 0. The length of each of the plurality of first microstructures 140 in the first direction D1 may fall within a range of 0 mm to 500 mm. In addition, the first microstructures 140 may be spaced apart from the light incident surface 130 in the first direction D1.
In the embodiment, each of the plurality of first microstructures 140 has a vertex angle (not labeled) far away from the light emitting surface 110, and the angle of the vertex angles decreases with the distance from the center 100M of the light guide plate 100. This feature of the first microstructure 140 can help to improve the brightness of the light source module 10 at both sides.
Please refer to fig. 1B. The light guide plate 100 may further include a plurality of second microstructures 150 disposed on the bottom surface 120. In the present embodiment, each of the second microstructures 150 is a concave structure. The second microstructure 150 may disrupt the total reflection of the light beam I. Therefore, the light beam I can exit from the light exit surface 110 and leave the light guide plate 100. That is, in the light source module 10 of the present embodiment, the second microstructures 150 can make the bottom surface 120 provide a diffusion effect to the light beam, so that the light beam I provided by the light source module 10 has better uniformity.
In addition, the light source module 10 may further include a reflective sheet 300. The reflective sheet 300 is disposed on the bottom surface 120 of the light guide plate 100. When the light beam I penetrates from the bottom surface 120 or the second microstructures 150 to leave the light guide plate 100, the reflective sheet 300 can reflect the light beam I back into the light guide plate 100, thereby increasing the light utilization efficiency of the light source module 10.
In addition, the light source module 10 may further include an optical film 400. The optical film 400 is disposed above the light emitting surface 110 of the light guide plate 100. The optical film 400 includes, for example, a prism sheet, a reverse prism sheet, a diffusion sheet, or a combination thereof, and different optical films can be selected according to different design requirements, which is not limited in the present invention. In the embodiment, the light beam emitted from the light emitting surface 110 passes through the optical film 400 and then exits from the light source module 10.
Fig. 2 is a schematic view of an optical path of a light guide plate according to an embodiment of the invention. The light guide plate 100 of fig. 2 may be similar to the light guide plate 100 of fig. 1A to 1C, but specific values, such as the number and size of the first microstructures 140, may be different.
Please refer to fig. 2. The light guide plate 100 may be divided into a central region CA and an edge region PA in the second direction D2, for example. The first microstructures 140 in the edge regions PA may have a larger included angle β than the central region CA. Therefore, when the light beam is emitted from the light emitting surface 110 of the light guide plate 100 through the first microstructure 140, the light emitting field angle of the edge area PA can be larger than that of the central area CA, so that the luminance of the edge area PA is improved, and the overall uniformity of the picture is improved.
In addition, because the first microstructures 140 in the central area CA and the edge area PA have fixed inner-side included angles α, the brightness of the light emitted from the central area CA can be maintained, and the gradual change effect of the outer-side included angle β can be prevented from being offset. Therefore, in the embodiment of the invention, while the light-emitting luminance of the light guide plate 100 in the edge area PA is improved, the light-emitting luminance of the central area CA can be maintained, so that the average luminance of the whole image can be improved. In the present embodiment, the inner angle α of the first microstructures 140 is a fixed value. Compared with the present embodiment, in the comparative example where the inner side included angles α of the plurality of first microstructures 140 are different, the light emitted from the first microstructures 140 in the central area CA may be non-uniform, and the light emitted from the portion of the first microstructures 140 close to the inner side included angle α may interfere with the light emitted from the portion of the first microstructures 140 close to the outer side included angle β, so that the luminance of the central area CA may be reduced, or the effect of improving the luminance of the light emitted from the edge area PA by the gradual change design that the outer side included angle β is reduced may be achieved.
Fig. 3A to 3C are schematic views of first microstructures of a light guide plate according to different embodiments of the invention. Please refer to fig. 3A to fig. 3C. The first microstructures 140 of the embodiment of fig. 3A are similar to the first microstructures 140 of the light guide plate 100 of fig. 1C. In the present embodiment, the plurality of first microstructures 140 are triangular prism-shaped structures. As shown in fig. 3A, the first microstructure 140 may have an inner angle α and an outer angle β.
The first microstructures 140a of the embodiment of fig. 3B are similar to the first microstructures 140 of fig. 3A, and the difference is that in the embodiment, the first microstructures 140a are free-form surface columnar structures. The free-form surface columnar structure can be a spherical columnar structure with a cross section outline of a conical curve, an aspheric columnar structure, or any free-form surface columnar structure with a cross section outline of a non-conical curve. As shown in fig. 3B, the first microstructure 140a may have an inner angle α and an outer angle β.
The first microstructures 140b of the embodiment of fig. 3C are similar to the first microstructures 140 of fig. 3A, but in this embodiment, the first microstructures 140b are pillar-shaped structures with flat tops. The first microstructure 140b may be similar to the first microstructure 140 or the columnar structure of the first microstructure 140a, but has a flat surface PS substantially parallel to the light emitting surface 110 of the light guide plate at the top portion of the columnar structure. As shown in fig. 3C, the first microstructure 140b may have an inner angle α and an outer angle β.
Fig. 4 is a schematic cross-sectional view of a light guide plate of a light source module according to another embodiment of the invention. Please refer to fig. 4. The light guide plate 100a of the embodiment of fig. 4 is similar to the light guide plate 100 of fig. 1C, and the differences are as follows. The light guide plate 100a includes a plurality of first microstructures 140c, and the plurality of first microstructures 140c are disposed on the light emitting surface 110. The first microstructures 140C of the present embodiment are similar to the first microstructures 140C shown in fig. 1C, and the difference is that each of the first microstructures 140C has an inner side surface 140SA and an outer side surface 140SB opposite to each other, an inner included angle α is formed between the inner side surface 140SA and the light emitting surface 110, an outer included angle β is formed between the outer side surface 140SB and the light emitting surface 110, and the outer side surface 140SB includes two first surfaces 140SB1 arranged in parallel and a second surface 140SB2 arranged between the two first surfaces 140SB1 and perpendicularly connecting the two first surfaces 140SB 1. It is known that when the light beam incident from a lower large angle enters the outer side surface 140SB, the light beam is refracted and then guided to exit in the forward direction of the light exit surface 110 of the light guide plate 100, and the light beam cannot exit in the side direction to overcome the side dark band problem. In the embodiment, for the light (for example, the light beam I1 in fig. 4) incident on the outer side surface 140SB of the first microstructure 140c at a relatively large angle from the lower side of the plurality of first microstructures 140c, the second surface 140SB2 can deflect part of the light from the lower side to the side direction for emitting, so that the problem that the light incident from the lower side at a large angle cannot be effectively guided to the two sides of the light guide plate 100 for emitting and still has dark side bands can be overcome, but the invention is not limited thereto.
Fig. 5 is a schematic cross-sectional view illustrating a light guide plate of a light source module according to another embodiment of the invention. Please refer to fig. 5. The light guide plate 100b of the embodiment of fig. 5 is similar to the light guide plate 100 of fig. 1C, and the differences are as follows. The light guide plate 100b includes a plurality of first microstructures 140 d. The plurality of first microstructures 140d are disposed on the light emitting surface 110. The first microstructures 140d of the present embodiment are similar to the first microstructures 140 shown in fig. 1C, and the difference is that each of the first microstructures 140d has an inner side surface 140SA and an outer side surface 140SB opposite to each other, an inner side included angle α is formed between the inner side surface 140SA and the light emitting surface 110, an outer side included angle β is formed between the outer side surface 140SB and the light emitting surface 110, the inner side surface 140SA is a first curved surface C1, and the curvatures of the first curved surfaces C1 of the first microstructures 140d are all the same. In the embodiment, the inner side surface 140SA with a curved surface configuration is adopted to increase the forward emitting effect of the light, but the invention is not limited thereto.
Fig. 6 is a schematic cross-sectional view of a light guide plate of a light source module according to still another embodiment of the invention. Please refer to fig. 6. The light guide plate 100C of the embodiment of fig. 6 is similar to the light guide plate 100 of fig. 1C, and the differences are as follows. The light guide plate 100c includes a plurality of first microstructures 140 e. The first microstructures 140e are disposed on the light emitting surface 110. The first microstructures 140e of the present embodiment are similar to the first microstructures 140 shown in fig. 1C, and the difference is that each of the first microstructures 140e has an inner side surface 140SA and an outer side surface 140SB opposite to each other, an inner side included angle α is formed between the inner side surface 140SA and the light emitting surface 110, an outer side included angle β is formed between the outer side surface 140SB and the light emitting surface 110, the inner side surface 140SA is a first curved surface C1, and the curvatures of the first curved surfaces C1 of the first microstructures 140e are all the same. And the outer side 140SB is the second curved surface C2, the curvature of the second curved surface C2 of the first microstructure 140e increases with distance from the center 100M of the light guide plate 100C. In the embodiment, for the light rays from the lower portions of the plurality of first microstructures 140e that are incident on the outer side 140SB of the first microstructures 140e at relatively large angles, the outer side 140SB of the first microstructures 140e can effectively guide the light rays to exit laterally, so as to improve the problem of side dark bands.
In summary, the light source module or the light guide plate of the invention can increase the brightness of the light source module at both sides by the structural design of the inner included angles and the outer included angles of the plurality of first microstructures, thereby improving the problem of dark bands at both sides of the light source module and improving the overall uniformity of the picture. In addition, the embodiment of the invention can maintain the average brightness of the central area of the picture while increasing the brightness of the light source module at two sides. Therefore, the average brightness of the whole picture area can be increased, and the efficiency of the light source module 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 in the description or the claims are used only for naming elements (elements) or distinguishing different embodiments or ranges, and are not used for limiting the upper limit or the lower limit on the number of elements.
Claims (22)
1. The light guide plate with the gradually-changed microstructures is characterized by comprising a light emitting surface, a bottom surface, a light incident surface and a plurality of first microstructures, wherein the first microstructures are arranged on the light emitting surface, the bottom surface, the light incident surface and the first microstructures
The bottom surface is opposite to the light-emitting surface;
the light incident surface is connected with the light emergent surface and the bottom surface; and
the plurality of first microstructures are arranged on the light emitting surface, each of the plurality of first microstructures extends along a first direction, and the plurality of first microstructures are arranged along a second direction, wherein the first direction is perpendicular to the light incident surface and the second direction, the second direction is parallel to the light incident surface, the plurality of first microstructures are arranged from one side of the light incident surface to the other side of the light incident surface, and the interval between the plurality of first microstructures in the second direction is 0,
wherein each of the plurality of first microstructures has an inner side included angle and an outer side included angle with the light emitting surface, the inner side included angle of each of the plurality of first microstructures is closer to the center of the light guide plate than the outer side included angle, the angles of the plurality of outer side included angles of the plurality of first microstructures are increased along with the distance from the center of the light guide plate, the angles of the plurality of inner side included angles of the plurality of first microstructures are fixed values, each of the plurality of first microstructures has an inner side surface and an outer side surface which are opposite, the inner side included angle is clamped between the inner side surface and the light emitting surface, the outer side angle is clamped between the outer side surface and the light emitting surface, the outer side surface comprises two first surfaces which are arranged in parallel and a second surface which is arranged between the two first surfaces and is vertically connected with the two first surfaces,
each of the plurality of first microstructures has a width along the second direction, the widths of the plurality of first microstructures decrease away from the center of the light guide plate,
each of the first microstructures has a height relative to the light emitting surface, and the heights of the first microstructures are fixed values.
2. The light guide plate with graded microstructures according to claim 1, wherein the inner side surface is a first curved surface, and curvatures of the first curved surfaces of the first microstructures are the same.
3. The light guide plate with graded microstructures according to claim 2, wherein the outer side surface is a second curved surface, and a curvature of the second curved surfaces of the first microstructures increases with distance from the center of the light guide plate.
4. The light guide plate with graded microstructures according to claim 1, further comprising blank areas at two ends of the light emitting surface in the second direction, wherein the blank areas do not have the first microstructures.
5. The light guide plate with graded microstructures according to claim 1, wherein each of the plurality of first microstructures has a vertex angle away from the light emitting surface, and angles of the vertex angles of the plurality of first microstructures decrease away from the center of the light guide plate.
6. The light guide plate with graded microstructures according to claim 1, wherein the angle of the inside angle and the outside angle of each of the plurality of first microstructures falls within a range of 0 to 80 degrees.
7. The light guide plate with graded microstructures of claim 1, wherein the height of each of the plurality of first microstructures falls within a range of 0 mm to 0.2 mm.
8. The light guide plate with graded microstructures according to claim 1, wherein an angle difference between the outer angles of any two adjacent first microstructures in the plurality of first microstructures is greater than 0 degree and less than 10 degrees.
9. The light guide plate with graded microstructures according to claim 1, wherein the plurality of first microstructures are triangular columnar structures, free-form surface columnar structures, or columnar structures with flat tops.
10. The light guide plate with graded microstructures of claim 1, further comprising a plurality of second microstructures disposed on the bottom surface.
11. The light guide plate with graded microstructures according to claim 1, wherein the plurality of first microstructures are integrally formed with the light guide plate with graded microstructures.
12. A light source module is characterized in that the light source module comprises a light guide plate with a gradual-change microstructure and a light source, wherein
The light guide plate with the gradual change microstructures comprises a light emitting surface, a bottom surface, a light incident surface and a plurality of first microstructures, wherein
The bottom surface is opposite to the light-emitting surface;
the light incident surface is connected with the light emergent surface and the bottom surface; and
the plurality of first microstructures are arranged on the light emitting surface, each of the plurality of first microstructures extends along a first direction, and the plurality of first microstructures are arranged along a second direction, wherein the first direction is perpendicular to the light incident surface and the second direction, the second direction is parallel to the light incident surface, the plurality of first microstructures are arranged from one side of the light incident surface to the other side of the light incident surface, and the interval between the plurality of first microstructures in the second direction is 0,
wherein each of the plurality of first microstructures has an inner side included angle and an outer side included angle with the light emitting surface, the inner side included angle of each of the plurality of first microstructures is closer to the center of the light guide plate than the outer side included angle, the angles of the plurality of outer side included angles of the plurality of first microstructures are increased along with the distance from the center of the light guide plate, the angles of the plurality of inner side included angles of the plurality of first microstructures are fixed values, each of the plurality of first microstructures has an inner side surface and an outer side surface which are opposite, the inner side included angle is clamped between the inner side surface and the light emitting surface, the outer side angle is clamped between the outer side surface and the light emitting surface, the outer side surface comprises two first surfaces which are arranged in parallel and a second surface which is arranged between the two first surfaces and is vertically connected with the two first surfaces,
each of the plurality of first microstructures has a width along the second direction, the widths of the plurality of first microstructures decrease away from the center of the light guide plate,
each of the first microstructures has a height relative to the light emitting surface, and the heights of the first microstructures are fixed values; and
the light source is used for providing light beams, and the light source is arranged beside the light incident surface of the light guide plate, so that the light beams can enter the light guide plate from the light incident surface.
13. The light source module of claim 12, wherein the inner surface is a first curved surface, and the curvatures of the first curved surfaces of the first microstructures are all the same.
14. The light source module of claim 13, wherein the outer side surface is a second curved surface, and a curvature of the second curved surfaces of the first microstructures increases away from the center of the light guide plate.
15. The light source module of claim 12, further comprising a blank area at both ends of the light emitting surface in the second direction, wherein the blank area does not have the plurality of first microstructures.
16. The light source module of claim 12, wherein each of the plurality of first microstructures has a vertex angle away from the light exit surface, and wherein the vertex angles of the plurality of first microstructures decrease away from the center of the light guide plate.
17. The light source module of claim 12, wherein the included angles of the inner side and the outer side of each of the first microstructures are in a range of 0 to 80 degrees.
18. The light source module of claim 12, wherein the height of each of the plurality of first microstructures falls within a range of 0 millimeters to 0.2 millimeters.
19. The light source module of claim 12, wherein the angular difference between the outside included angles of any two adjacent first microstructures in the plurality of first microstructures is greater than 0 degree and less than 10 degrees.
20. The light source module of claim 12, wherein the plurality of first microstructures are triangular pillar structures, free-form pillar structures, or pillar structures with flat tops.
21. The light source module of claim 12, further comprising a plurality of second microstructures disposed on the bottom surface.
22. The light source module of claim 12, wherein the plurality of first microstructures are integrally formed with the light guide plate having graded microstructures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210064774.5A CN114089464B (en) | 2022-01-20 | 2022-01-20 | Light guide plate with gradual change microstructure and light source module thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210064774.5A CN114089464B (en) | 2022-01-20 | 2022-01-20 | Light guide plate with gradual change microstructure and light source module thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114089464A CN114089464A (en) | 2022-02-25 |
| CN114089464B true CN114089464B (en) | 2022-09-06 |
Family
ID=80308975
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210064774.5A Active CN114089464B (en) | 2022-01-20 | 2022-01-20 | Light guide plate with gradual change microstructure and light source module thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114089464B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117631124A (en) * | 2022-08-16 | 2024-03-01 | 台州观宇科技有限公司 | Display and light guide structure thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102955196A (en) * | 2012-11-02 | 2013-03-06 | 京东方科技集团股份有限公司 | Light guide plate, backlight module and display device |
| CN214503947U (en) * | 2021-04-07 | 2021-10-26 | 扬昕科技(苏州)有限公司 | Light guide plate and light source module |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100351655C (en) * | 2003-07-26 | 2007-11-28 | 鸿富锦精密工业（深圳）有限公司 | Backlight module and light conducting plate |
| CN201078650Y (en) * | 2007-08-03 | 2008-06-25 | 科桥电子股份有限公司 | Light conducting plate |
| CN209746175U (en) * | 2019-09-11 | 2019-12-06 | 江西联创致光科技有限公司 | Light guide plate with gradual change formula light-emitting microstructure |
-
2022
- 2022-01-20 CN CN202210064774.5A patent/CN114089464B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102955196A (en) * | 2012-11-02 | 2013-03-06 | 京东方科技集团股份有限公司 | Light guide plate, backlight module and display device |
| CN214503947U (en) * | 2021-04-07 | 2021-10-26 | 扬昕科技(苏州)有限公司 | Light guide plate and light source module |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114089464A (en) | 2022-02-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7357557B2 (en) | Light guide plate | |
| US7990490B2 (en) | Optical sheet and display device having the same | |
| KR101448047B1 (en) | Light control element, surface light source device and liquid crystal display | |
| EP2264487B1 (en) | Surface light source device and illumination unit | |
| US8920017B2 (en) | Surface light source device | |
| US9217821B2 (en) | Light guide plate, surface light source device, and display device | |
| US7995160B2 (en) | Prism sheet and liquid crystal display having the same | |
| US8678635B2 (en) | Surface light source device, liquid crystal display device and optical member | |
| KR20040048803A (en) | Planar light source unit and display device | |
| US20060203494A1 (en) | Light control member, surface light source device and display | |
| US6786613B2 (en) | Spread illuminating apparatus | |
| KR19980069863A (en) | Light guide, manufacturing method of light guide, and surface light source | |
| CN114089464B (en) | Light guide plate with gradual change microstructure and light source module thereof | |
| EP2881655B1 (en) | Luminous flux control member, light emitting device, and display device | |
| KR101875026B1 (en) | Light distribution lens | |
| KR101939550B1 (en) | Light distribution lens | |
| JP4815930B2 (en) | Light transmissive film, backlight device, and liquid crystal display device | |
| KR20200000330A (en) | Spread illuminating apparatus | |
| CN113655558B (en) | Light guide plate and backlight module | |
| JP4984512B2 (en) | Surface light emitting device and liquid crystal display device | |
| JP2006202559A (en) | Surface light source apparatus | |
| JP5293177B2 (en) | Optical sheet, surface light source device and display device | |
| KR20130133569A (en) | Back light unit and liquid crystal display comprising the same | |
| CN107728249B (en) | Display device | |
| WO2019187462A1 (en) | Plane-shaped lighting device |
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 |