TWI479209B - Light guide plate - Google Patents

Description

Light guide

The present invention relates to a light guide plate through which light can pass and evenly disperse light.

Generally, the light guide plate is generally provided with a microstructure on the light-emitting surface of the plate to improve the uniformity and brightness of the light passing through the light-emitting surface. The types and forms of the microstructure are many, and some are provided on the light-emitting surface. The protrusions of the prisms, the corner posts, the semi-circular circles, and the like arranged neatly, and the light guide bars arranged in parallel on the light-emitting surface in a single direction. Wherein, the microstructure formed by a plurality of neatly arranged light guiding strips can change the refractive path of the light to improve the uniformity and brightness of the light passing through the light guiding plate, but the regular and straight strips of the light guiding strip are in a single direction. The light collecting effect is better. Therefore, when light passes through the light guide plate, interference fringes and moiré are easily generated, so the uniformity is poor.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a light guide plate which can improve the interference of light when passing through a microstructure to improve the uniformity of light passage.

The light guide plate of the present invention comprises a sheet body and a microstructure located on a first side of the sheet body.

The microstructure includes a plurality of light guiding strips extending along a first direction, each light guiding strip having a surface and at least one elongated protrusion extending in a second direction, having at least one spanning One of the light guiding strips protrudes from the ridge section of the surface of the light guiding strip.

The first direction and the second direction of the light guiding strip of the present invention are non-parallel, and both have an angle of intersection. The height of each of the ridge segments is substantially equal or the width of the bottom surface of each ridge segment is substantially equal.

The ridge segments of the present invention may be single, a plurality of connected, or a plurality of unconnected. Preferably, the extending direction of the elongated protrusions is perpendicular to the extending direction of the light guiding strips, wherein the width of the bottom surface of the protruding sections is preferably 1~30 μm, and the height is 0.5~1.5 μm. It is better.

Further, the cross-sectional shape of the light guiding strips of the present invention is not particularly limited, and may be a geometric shape of a triangle, a semicircle or the like. Preferably, the plate body further comprises a discontinuous structure composed of a plurality of pits or a plurality of bumps, which are disposed on the second side of the plate body, the second side body being opposite to the first side, The pits or the bumps have a diameter of 30 to 200 μm and a depth or height of 5 to 50 μm.

The beneficial effect of the present invention is that the use of the elongated protrusions that extend across and protrude from the surface of the light guiding strips can destroy the interference phenomenon caused by the light collecting effect of the light guiding strips being better in a single direction, and thus Reduces moiré and improves the uniformity of light as it passes through the light guide.

The above and other technical features, features, and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments.

Before the present invention is described in detail, it is noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to Figures 1, 2, 3a and 3b, a first preferred embodiment of the light guide plate of the present invention comprises: a plate body 1 and a microstructure 2 disposed on a first side of the plate body 1, the plate body 1 The second side has a discontinuous structure 12 having a plurality of evenly spaced and relatively concave recesses 121, the second side of the sheet body 1 being opposite the first side. In the preferred embodiment, the diameter d1 of the pits 121 is preferably 30-200 μm, and the depth h1 is preferably 5-50 μm. However, the present invention is not designed to have such recesses. Point 121 is necessary, and the discontinuous structure 12 can also be a uniformly distributed bump.

The microstructure 2 of the embodiment is located on the first side of the plate body 1. The microstructure 2 and the plate body 1 may be integrally formed, or may be separately fabricated and then stacked. Specifically, the microstructure 2 of the present invention and the sheet body 1 are integrally formed.

In this embodiment, the microstructure 2 includes: a plurality of light guiding strips 22 extending parallel to each other and extending along a first direction 21, and a plurality of elongated protrusions 24 protruding from the light guiding strips 22, the length of the strips The strip-like projections 24 are parallel to each other and extend along a second direction 23. In the preferred embodiment, the first direction 21 is perpendicular to the second direction 23. Wherein, the light guiding strips 22 have a triangular cross section and each have a surface 220 composed of two intersecting inclined surface portions 222. Preferably, the bottom edge width w1 of the light guiding strips 22 is 10~300 μm, and the protrusion height h2 of the light guiding strips 22 is preferably 3~150 μm, and the height of the protruding strips of the light guiding strips 22 is The h2/bottom edge width w1 is preferably greater than 2/10. When the protrusion height h2/bottom edge width w1 of the light guiding strip 22 is less than 2/10, the difficulty of molding the elongated strips 24 will be increased. degree.

The strip-like protrusions 24 of the present embodiment are continuous undulating shapes and span the light guiding strips 22, and each strip-like protrusion 24 is composed of a plurality of ridge sections 240, each ridge The segments 240 each have two inclined ridges 241 that respectively correspond to the slopes 222 of the light guide strips 22. Preferably, the width Width w2 of the ridge segments 240 is preferably 1 to 30 μm, and the maximum height h3 is preferably 0.5 to 1.5 μm. The bottom surface width w2 of each of the ridge segments 240 is substantially equal, and the maximum height h3 is also substantially equal.

When the light guide plate of the first preferred embodiment of the present invention is used, the light enters from the side other than the first side and the second side of the plate body 1, and then passes through the first side. When the pits 121 are evenly distributed, the angle of refraction of the light can be changed to increase the uniform diffusion effect. When the light passes through the first side of the plate body 1, the light guiding strips 22 on the first side can produce a refractive dispersion effect, and the elongated protrusions 24 vertically spanning the light guiding strips 22 It will slightly destroy the single-direction concentrating effect caused by the light guiding strip 22, thus solving the problem of moiré. Therefore, in the present embodiment, the design of the microstructures 2 of the elongated strips 24 disposed on the light guiding strips 22 can truly destroy the interference phenomenon caused by the light collecting effect of the light guiding strips 22 in a single direction. , reduce the problem of moiré.

Referring to FIG. 4, the second preferred embodiment of the light guide plate of the present invention has a configuration similar to that of the first preferred embodiment, except that the surface 220 of the light guide strips 22 of the microstructure 2 is embossed. An arcuate shape having a semicircular or semi-circular cross section, and the elongate protrusions 24 are formed by a plurality of ridge segments 240 that are discontinuous with each other, changing the cross-sectional shape of the light guiding strips 22, and Such The arrangement of the elongated protrusions 24 can also achieve the purpose of improving the uniformity of light.

Referring to FIG. 5, a third preferred embodiment of the light guide plate of the present invention has a configuration similar to that of the first embodiment, that is, the microstructure 2 includes a plurality of light guiding strips 22 disposed along the first direction 21, and a plurality of strips. The third preferred embodiment of the present invention differs from the first preferred embodiment in that the second direction 23 has a difference from the first direction 21 The angle of intersection. By changing the direction in which the elongated protrusions 24 are disposed, the purpose of improving the uniformity of light can also be achieved.

Referring to Figures 6 and 7, a fourth preferred embodiment of the light guide plate of the present invention has a configuration similar to that of the first embodiment, that is, the elongated strips 24 also have a plurality of corresponding light guide strips 22 respectively. One of the ridge segments 240, each of the ridge segments 240 also has two slanting ridges 241. The difference between this embodiment and the first embodiment is that the slanted ridges 241 each have a light guiding strip adjacent to the light guiding strips. The low point 242 of the valley bottom of 22, and a high point 243 corresponding to the ridgeline of the light guide strip 22, the low points 242 of the ridge sections 240 all fall on a low point line 244, and the ridges The high point 243 of the segment 240 falls on a high point connection 245, and the projections of the low point connection 244 and the high point connection 245 are parallel. That is, the oblique ridge portion 241 of the present embodiment has an inclined design as viewed from the side of the light guide plate.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

1‧‧‧Sheet body

12‧‧‧discontinuous structure

121‧‧‧dump

2‧‧‧Microstructure

21‧‧‧First direction

22‧‧‧Light guide strips

220‧‧‧ surface

222‧‧‧ oblique face

23‧‧‧second direction

24‧‧‧Long strips

240‧‧‧Spine section

241‧‧‧ oblique ridge

242‧‧‧ low

243‧‧‧High

244‧‧‧ low point connection

245‧‧‧High point connection

D1‧‧‧diameter

H1‧‧‧depth

H2‧‧‧Bar height

h3‧‧‧Maximum height

W1‧‧‧ bottom edge width

W2‧‧‧ bottom width

1 is a perspective view of a first preferred embodiment of a light guide plate of the present invention; FIG. 2 is a cross-sectional view taken along line A-A' of FIG. 1; FIG. 3a is a partially enlarged view of the preferred embodiment; Figure 3b is a cross-sectional view taken along line BB' of Figure 2; Figure 4 is a front cross-sectional view of a second preferred embodiment of the light guide plate of the present invention; Figure 5 is a third comparison of the light guide plate of the present invention FIG. 6 is a perspective view similar to FIG. 5, illustrating a fourth preferred embodiment of the light guide plate of the present invention; and FIG. 7 is a plan view of the fourth preferred embodiment of the present invention.

1‧‧‧Sheet body

2‧‧‧Microstructure

21‧‧‧First direction

22‧‧‧Light guide strips

220‧‧‧ surface

222‧‧‧ oblique face

23‧‧‧second direction

24‧‧‧Long strips

240‧‧‧Spine section

Claims (10)

A light guide plate comprising: a plate body; and a microstructure disposed on a first side of the plate body, comprising: a plurality of light guiding strips extending along a first direction, the light guiding strips each having a surface The surface has two intersecting bevels; and at least one elongated protrusion extending along a second direction, the elongated protrusion having at least one of the light guiding strips protruding from one of the light guiding strips a ridge section of the slope portion of the surface of the light guiding strip. The light guide plate of claim 1, wherein the elongated protrusion has a plurality of ridge segments respectively crossing each of the light guiding strips, and the ridge segments are not connected to each other. The light guide plate of claim 1, wherein the elongated protrusion has a plurality of ridge segments respectively spanning each of the light guiding strips, the ridge segments being connected to each other. The light guide plate of any one of claims 1 to 3, wherein the first direction has an angle of intersection with the second direction. The light guide plate of claim 4, wherein the first direction and the second direction are perpendicular to each other. The light guide plate of claim 1, wherein the ridge section has a bottom surface width of 1 to 30 μm and a maximum height of 0.5 to 1.5 μm. The light guide plate of claim 1, wherein the light guide strips are high Degree/bottom edge width is greater than 2/10. The light guide plate of claim 7, wherein the sheet body has a discontinuous structure on the second side, the second side of the sheet body being opposite the first side. The light guide plate of claim 8, wherein the discontinuous structure comprises a plurality of pits or a plurality of bumps, the pits or bumps having a diameter of 30 to 200 μm, the depth of the pits or the The height of the bumps is between 5 and 50 μm. The light guide plate of claim 2 or claim 3, wherein each of the ridge segments has two ridge portions, each ridge portion having a light guide strip adjacent to the light guide strip The low point of the bottom of the valley, and a high point corresponding to the ridgeline of the light guide strip, the low points of the ridge sections fall on a low point line, and the high points of the ridge sections fall on A high point is connected, and the aforementioned low point line and the high point line are parallel and spaced apart.