TWM593569U - Light guide plate and backlight module - Google Patents

Abstract

A light guide plate includes a light guide body, a light incident micro structure and a plurality of convex-strip microstructures. The light guide body has a light incident surface and a light emitting surface connected to the light incident surface. The light incident micro structure is disposed on the light incident surface. The convex-strip microstructures are disposed on the light emitting surface. Each of the convex-strip microstructures is extended along an extended direction from a point close to the light incident surface to another point far away the light incident surface. Each of the convex-strip microstructures has a vertical height opposite to the light emitting surface, and the vertical height is gradually increased along the extended direction before being gradually decreased along the extended direction. A backlight module is further disclosed.

Description

Light guide plate and backlight module

This creation is about a light guide technology, especially a light guide plate and backlight module.

The conventional backlight module includes a light guide plate and a plurality of light emitting diodes. The light guide plate has a light incident surface and a light exit surface adjacent to the light incident surface. The light emitting diode is disposed beside the light incident surface of the light guide plate, and the light emitting diode After the light emitted by the body enters the light guide plate from the light entrance surface, the light guide plate guides the light to the light exit surface of the light guide plate and exits. The light-emitting diodes are arranged next to the light incident surface in sequence according to a certain separation distance (P), and the area of the light guide plate corresponding to the active area (or display area) of the display and the edge of the light guide plate With a distance (A), when the A/P value is too small (for example, a narrow-frame display), the light emitted by each light-emitting diode will cause the light exit surface of the light guide plate to be close to the light entrance surface to form bright and dark alternating bright areas and dark areas Zone, that is, the phenomenon of hot spot. The conventional method is to provide a bump structure (R-cut) with arc-shaped sides on the light incident surface to improve the uneven brightness, but such a design will reduce the brightness of the backlight module.

Another conventional light guide plate is provided with a semi-cylindrical structure extending from the light incident surface away from the light incident surface on the light exit surface to increase the brightness and shielding of the backlight module, but close to the light incident surface The uneven light and dark phenomenon of the area still exists, and the area far away from the light incident surface is obviously darker, resulting in uneven light and dark on the light emitting surface of the backlight module. If the above lenticular structure and R-cut structure are used at the same time, interference lines will be generated on the light exit surface, so the above lenticular structure and R-cut structure cannot be used together.

This "prior art" paragraph is only used to help understand the content of the creation. Therefore, the content disclosed in the "prior art" may include some conventional technologies that are not known to those with ordinary knowledge in the technical field to which they belong. In addition, the content disclosed in the "prior art" does not mean the content or the problem to be solved by one or more embodiments of this creation, nor does it mean that the person who has ordinary knowledge in the technical field before the creation application Know or know.

This creation provides a light guide plate and a backlight module, which can be provided with a microstructure on the light exit surface and the light entrance surface at the same time to provide a uniform backlight source and avoid cross interference lines.

The other purposes and advantages of this creation can be further understood from the technical features disclosed in this creation.

In order to achieve one, some or all of the above-mentioned purposes or other purposes, the light guide plate provided by this creation includes a light guide body, a light-incident microstructure, and a plurality of convex strip microstructures. The light guide body has a light incident surface and a light exit surface connected to the light incident surface. The light incident microstructure is disposed on the light incident surface. A plurality of convex stripe microstructures are provided on the light exit surface, and each convex stripe microstructure extends from an extension direction close to the light incident surface toward a distance away from the light entrance surface, and each convex stripe microstructure has an incremental amount along the extension direction relative to the light exit surface Then decrease the vertical height.

In order to achieve one, part, all or all of the above or other purposes, the backlight module provided by the present creation includes the above-mentioned light guide plate and a light-emitting component disposed beside the light incident surface and opposite to the light incident microstructure.

In an embodiment of the present invention, the light exit surface includes a first area and a second area. The first area is disposed between the second area and the light incident surface. The convex microstructures are disposed in the second area. The first area exposes a portion of the light exit surface of the light guide plate, which is a plane.

In an embodiment of the present invention, the length of the light guide plate in the extending direction is L1, and the length of the first zone in the extending direction is L2, and L2≦L1/4.

In an embodiment of the present creation, L2>1mm.

In an embodiment of the present creation, the cross section of each convex strip microstructure in the vertical extension direction is triangular, trapezoidal, semicircular, or semielliptical.

In an embodiment of the present creation, each convex stripe microstructure further includes ridge lines. The vertical height is distributed along the ridgeline, where the ridgeline includes the highest ridgeline point with the largest vertical height relative to the light exit surface, and the lowest ridgeline point near the light entrance surface and with the smallest vertical height relative to the light exit surface, where the highest ridgeline point It has a connection with the lowest ridge point, and the angle between the connection and the light exit surface is greater than 0 degrees and less than or equal to 0.5 degrees.

In an embodiment of the present creation, the minimum vertical height is greater than or equal to 0 um and less than or equal to 10 μm, and the maximum vertical height is greater than 0 um and less than or equal to 50 um.

In an embodiment of the present invention, each convex stripe microstructure has a first side edge and a second side edge on the light exit surface. The distance between the first side edge and the second side edge increases first and then decreases along the extending direction.

In an embodiment of the present creation, the light incident microstructure includes a plurality of semi-circular cylinders.

In an embodiment of the present creation, the light incident microstructure includes an injection-molded or hot-pressed structure.

The light guide plate of the embodiment of the present invention is provided with a plurality of convex stripe microstructures on the light exit surface, and each convex stripe microstructure has an increasing and decreasing height relative to the light exit surface. Cross interference lines generated near the light incident surface, and increase the brightness away from the light incident surface to increase the overall light emitting uniformity of the backlight module.

In order to make the above and other purposes, features and advantages of this creation more obvious and understandable, the following is a detailed description of the preferred embodiments and the accompanying drawings.

10: Backlight module

100: light guide plate

110: Light guide body

111: light side

112: light side

113: Underside

116: District 1

117: District 2

120: incident light microstructure

130: convex strip microstructure

131: Edge

133: first side margin

134: second side margin

W: distance

200: light emitting component

210: substrate

211: Setting surface

220: light emitting element

F1: Extension direction

H1: Maximum vertical height

H2: minimum vertical height

L: light

L1, L2: length

P1: the highest ridge point

P2: lowest ridge point

FIG. 1A is a schematic top view of a backlight module according to an embodiment of the present invention.

FIG. 1B is a schematic cross-sectional view taken along line A-A of FIG. 1A.

FIG. 1C is a schematic cross-sectional view taken along line B-B of FIG. 1A.

FIG. 1D is a schematic perspective view of the light guide plate in FIG. 1A.

The foregoing and other technical contents, features and effects of this creation will be clearly presented in the following detailed description with reference to one of the preferred embodiments of the drawings. The direction words mentioned in the following embodiments, for example: up, down, left, right, front or back, etc., are only for the directions referring to the attached drawings. Therefore, the terminology used is to illustrate and not to limit this creation.

1A is a schematic top view of a backlight module according to an embodiment of the present invention, FIG. 1B is a schematic cross-sectional view taken along line AA of FIG. 1A, FIG. 1C is a schematic cross-sectional view taken along line BB of FIG. 1A, and FIG. 1D is a schematic view of FIG. 1A. A three-dimensional schematic diagram of the light guide plate. 1A and 1B, the backlight module 10 of this embodiment includes a light guide plate 100 and a light-emitting assembly 200. The light guide plate 100 includes a light guide body 110, a light incident microstructure 120, and a plurality of convex strip microstructures 130. The light guide body 110 has a light incident surface 111 and a light exit surface 112 connected to the light incident surface 111. The light incident microstructure 120 is disposed on the light incident surface 111. A plurality of convex stripe microstructures 130 are disposed on the light exit surface 112, and each convex stripe microstructure 130 extends from an extension direction F1 close to the light incident surface 111 toward the light exit surface 111, and each convex stripe microstructure 130 is opposite to the light exit surface 112 has a vertical height that increases first and then decreases along the extension direction F1. The light emitting element 200 is disposed beside the light incident surface 111 and opposite to the light incident microstructure 120. The light emitting element 200 may include a substrate 210 and a device disposed on the substrate 210 Each of the plurality of light-emitting elements 220 on the placement surface 211 can emit light L toward the light-incident surface 111. In addition, the backlight module 10 may further include a light-injecting straight strip glue (not shown) for pasting the light emitting element 200 to the light guide body 110.

1D, in this embodiment, the light exit surface 112 of the light guide plate 100 includes a first region 116 and a second region 117. The first region 116 is disposed between the second region 117 and the light incident surface 111. The convex microstructure 130 is disposed in the second region 117. A portion of the light exit surface 112 of the light guide plate 100 exposed by the first region 116 is a flat surface. That is, the light exit surface 112 is not provided with any microstructure in the first area 116 close to the light entrance surface 111. In this way, no convex microstructure 130 is provided on the light emitting surface 112 in a local area close to the light incident surface 111, so as to reduce the possibility that the light L emitted from the light emitting device 200 may generate a cross-interference pattern in the first region 116. In this embodiment, the length of the light guide plate 100 in the extending direction F1 is L1, and the length of the first region 116 in the extending direction F1 is L2, and L2≦L1/4. Further, in this embodiment, the first area 116 is a rectangular area with a length L2 and the same width as the light exit surface 112. The ratio of the length L1 to the length L2 in this creation is to consider the configuration of the light-emitting assembly 200 and the display area of the display panel (not shown) corresponding to the backlight module 10 as a whole. For the common size of the light guide plate 100, The length L2 of the first region 116 in the extending direction F1 is generally greater than 1 mm, or greater than 3 mm.

Referring to FIG. 1C, in this embodiment, the cross-section of each convex microstructure 130 in the vertical extension direction F1 is semicircular, but it is not limited to this. In other embodiments not shown, each convex stripe microstructure 130 may also have a triangular, trapezoidal or semi-elliptical cross-section.

Please refer to FIGS. 1A and 1B. In this embodiment, each convex microstructure 130 further includes an ridge line 131. The ridge line 131 may be a line connecting the height-controlling points of the convex microstructure 130 on the cross section of the vertical extension direction F1. In this embodiment, the vertical projection of the ridge line 131 on the light exit surface 112 is a straight line parallel to the extending direction F1, but it is not limited to this. The vertical height of the convex microstructure 130 with respect to the light emitting surface 112 is distributed along the ridge line 131, wherein the ridge line 131 includes the highest ridge point P1 having the maximum vertical height H1 relative to the light emitting surface 112, and the light emitting surface 111 near the light emitting surface 112 and relatively emitting light Face 112 has the smallest vertical height The lowest ridge point P2 of the degree H2, wherein the highest ridge point P1 and the lowest ridge point P2 have a connection, and the angle θ between the connection and the light exit surface is greater than 0 degrees and less than or equal to 0.5 degrees. For a common size of the light guide plate 100, the minimum vertical height H2 is greater than or equal to 0um and less than or equal to 10um, and the maximum vertical height H1 is greater than 0um and less than or equal to 50um. In this embodiment, the ridgeline 131 has another minimum vertical height at the ridgeline point farthest from the light incident surface 111 (that is, the position of the convex microstructure 130 whose vertical height first increases and then decreases away from the light incident surface 111) The height can be adjusted according to the brightness on the light exit surface away from the light entrance surface area, and is not particularly limited.

In this embodiment, the ridge line 131 of each convex microstructure 130 is a straight line with increasing slope and a straight line with decreasing slope. Therefore, in the cross-sectional view of FIG. 1B, the connection between the highest ridge point P1 and the lowest ridge point P2 The line overlaps a part of the line segment of the ridge line 131, but it is not limited to this. When the ridge line 131 is, for example, arc-shaped or polyline-shaped, it first increases and then decreases, the connection between the highest ridge line point P1 and the lowest ridge line point P2 does not necessarily overlap with the ridge line 131. In addition, although the highest ridge point P1 in this embodiment is a tip, it is not limited to this. In other embodiments not shown, the top of each convex microstructure 130 may also be platform-shaped, that is, convex The strip microstructure 130 has a vertical height that increases first and then fixes a height and then decreases along the extending direction F1 relative to the light exit surface 112.

Please refer to FIG. 1A. In this embodiment, each convex microstructure 130 has a first side edge 133 and a second side edge 134 on the light exit surface. The distance W between the first side edge 133 and the second side edge 134 in the direction perpendicular to the extension direction F1 is first increased and then decreased along the extension direction F1, so as to further improve the light emitting uniformity of the light emitting surface 112, but it is not limited to this. In other embodiments not shown, the distance W between the first side edge 133 and the second side edge 134 may also be a fixed value. In particular, the closest distance between the first side edge 133 of each convex strip microstructure 130 and the second side edge of the adjacent convex strip microstructure 130 may be greater than zero or equal to zero, meaning that each convex strip microstructure 130 It can be completely separated from the adjacent convex microstructure 130 (for example, it is in the form of a discontinuous groove as shown in FIG. 1A), or it can be partially connected (e.g. If it is connected to the adjacent convex microstructure 130 at the maximum distance W, it is in the form of a continuous groove, not shown in the figure).

In this embodiment, the light-incident microstructure 120 may include a plurality of semi-circular cylinders, but it is not limited thereto. In other embodiments, the light-incident microstructure 120 may be a concave point structure, a dot, or an atomized surface Wait for different structures. In addition, the light guide plate 100 of this embodiment can be manufactured by integral injection molding in the manufacturing process, so the light incident microstructure 120 can be an injection molded structure. However, the light guide plate 100 of this embodiment can also be manufactured by an injection molding process with hot pressing technology. For example, the light guide plate 100 except for the light microstructure 120 can be formed by injection molding first, and then by hot pressing The light incident microstructure 120 is formed on the light incident surface 111 by technology. In this way, even if the thickness of the light guide plate 100 is very thin, for example, less than 0.5 mm, the light incident microstructure 120 may be provided on the light incident surface 111, thereby reducing the arrangement density of the light emitting elements 220 of the light emitting assembly 200.

In this embodiment, the light guide body 110 may further have a bottom surface 113. The bottom surface 113 may be a diffusion surface, which is suitable for destroying the total reflection of the light in the light guide plate 100, so that the light emitting angle of the light is changed, and the proportion of light emitted from the light emitting surface 112 in each area of the light guide plate 100 is increased, thereby increasing the light emitting surface 112 Brightness and uniformity. Specifically, the bottom surface 113 may have multiple diffusion points, and these diffusion points may be formed by printing, injection molding, or laser etching the bottom surface 113. The shape of these diffusion points may be, for example, hemispherical bumps, spherical crown bumps, rectangular parallelepiped bumps, hemispherical recesses, spherical crown bumps, or rectangular parallelepiped recesses.

In the present embodiment, the material of the light guide plate 100 may be a transparent material such as acrylic acid resin, polycarbonate or polyvinyl resin, but it is not limited thereto. The shape of the light guide plate 100 can be a circular flat plate or a flat plate of other geometric shapes in addition to the illustrated rectangular flat plate.

The light guide plate 110 of this embodiment is provided with an area without microstructures and a plurality of convex stripe microstructures 130 with increasing vertical height on the side of the light exit surface 112 close to the light entrance surface 111 to match the light incident microstructure 120 Under the design, cross interference lines can be avoided near the light incident surface, and a plurality of microstructures 130 with a decreasing vertical height are provided on the light emitting surface 112 away from the light incident surface 111 to increase the brightness away from the light incident surface to increase The uniformity of light output of the backlight module 10 as a whole.

However, the above are only the preferred embodiments of this creation, which should not be used to limit the scope of the implementation of this creation, that is, the simple equivalent changes and modifications made by Dafan in accordance with the scope of patent applications and new descriptions of this creation, All still fall within the scope of this creative patent. In addition, any embodiment or scope of patent application of this creation does not need to achieve all the purposes or advantages or features disclosed by the cost creation. In addition, the abstract part and title are only used to assist the search of patent documents, not to limit the scope of the rights of this creation. In addition, the terms "first" and "second" mentioned in this specification or the scope of patent application are only used to name the element or distinguish different embodiments or ranges, not to limit the number of elements. Upper or lower limit.

10: Backlight module

100: light guide plate

110: Light guide body

111: light side

112: light side

120: incident light microstructure

130: convex strip microstructure

131: Edge

133: first side margin

134: second side margin

W: distance

200: light emitting component

210: substrate

211: Setting surface

220: light emitting element

F1: Extension direction

L: light

Claims (12)

A light guide plate, including: A light guide body having a light incident surface and a light exit surface connected to the light incident surface; A light incident microstructure disposed on the light incident surface; and A plurality of convex stripe microstructures are disposed on the light exit surface, wherein each of the convex stripe microstructures extends from an approaching direction toward the light incident surface away from the light incident surface, and each of the convex stripe microstructures is opposite The light-emitting mask has a vertical height, wherein the vertical height first increases and then decreases along the extending direction. The light guide plate according to claim 1, wherein the light exit surface includes a first area and a second area, the first area is disposed between the second area and the light entrance surface, and the convex strip microstructures are provided In the second area, the first area exposes a portion of the light exit surface of the light guide plate, and the portion of the light exit surface is a plane. The light guide plate of claim 2, wherein the length of the light guide plate in the extension direction is L1, the length of the first region in the extension direction is L2, and L2 ≦ L1/4. The light guide plate according to claim 2, wherein the length of the first region in the extending direction is L2, and L2> 1 mm. The light guide plate according to claim 1, wherein the cross section of each of the convex strip microstructures perpendicular to the extending direction is triangular, trapezoidal, semicircular, or semielliptical. The light guide plate of claim 1, wherein each of the convex strip microstructures further includes an ridge line, and the vertical height is distributed along the ridge line, wherein the ridge line includes a maximum vertical height relative to the light exit mask A highest ridge line point, and a lowest ridge line point close to the light incident surface and having a minimum vertical height relative to the light exit mask, wherein the highest ridge line point and the lowest ridge line point have a connection, and the connection The angle between the line and the light exit surface is greater than 0 degrees and less than or equal to 0.5 degrees. The light guide plate according to claim 6, wherein the minimum vertical height is greater than or equal to 0 um and less than or equal to 10 um, and the maximum vertical height is greater than 0 μm and less than or equal to 50 um. The light guide plate of claim 1, wherein each of the convex strip microstructures has: A first side edge on the light exit surface; and A second side edge is located on the light exit surface, and the distance between the first side edge and the second side edge increases first and then decreases along the extending direction. The light guide plate according to claim 1, wherein the light incident microstructure includes a plurality of semi-circular cylinders. The light guide plate according to claim 1, wherein the light incident microstructure includes a structure formed by injection molding or hot press molding. A backlight module includes: A light guide plate, including: A light guide body having a light incident surface and a light exit surface connected to the light incident surface; A light incident microstructure is disposed on the light incident surface; and A plurality of convex stripe microstructures, wherein each of the convex stripe microstructures extends from an approaching direction toward the light incident surface away from the light incident plane, and each of the convex stripe microstructures is perpendicular to the light exiting mask Height, where the vertical height increases first and then decreases along the direction of extension; and A light-emitting component is disposed beside the light incident surface and opposite to the light incident microstructure. The backlight module according to claim 11, wherein the light-emitting assembly includes a plurality of light-emitting elements, and each of the light-emitting elements is used to emit light toward the light-entering microstructure.

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