CN216411626U - Light guide plate and light source module - Google Patents

Abstract

The utility model provides a light guide plate which comprises a plate body, a plurality of first strip-shaped structures and a plurality of second strip-shaped structures. The plurality of first strip-shaped structures are arranged on the light emergent surface of the plate body and extend from the light incident surface close to the plate body to the extending direction far away from the light incident surface. The height of each first strip-shaped structure is gradually reduced along the extension direction. Any two adjacent first strip-shaped structures have a structure interval area between them. The structure pitch region is configured with at least one of a plurality of second strip-shaped structures. A first space region is arranged between each adjacent first strip-shaped structure and each adjacent second strip-shaped structure, and a second space region is arranged between any two adjacent second strip-shaped structures. The widths of the first distance regions and the second distance regions at one side adjacent to the light incident surface are more than 0um and less than 10 μm. The utility model also provides a light source module using the light guide plate. The light guide plate and the light source module provided by the utility model can improve the brightness and the light uniformity without influencing the quality of a display picture.

Description

Light guide plate and light source module

Technical Field

The present invention relates to a light source module, and more particularly, to a light guide plate and a light source module using the same.

Background

Generally, a liquid crystal display device includes a liquid crystal display panel and a backlight module, and when a high-directivity microstructure and a film with a good light-receiving property are matched in a conventional lateral backlight module, most light rays are easily concentrated in the center of a picture. Although the light utilization rate can be effectively improved by the mode, brightness difference is easily generated at the left side and the right side and the center, and partial dark bands are formed at the left side and the right side.

By adjusting the pitch between the microstructures, the above-mentioned situation can be reduced. However, when the distance is too large to exceed a certain range, bright and dark stripes may be generated on the picture that emits light to the display panel, thereby affecting the overall picture quality.

The background section is only provided to aid in understanding the present disclosure, and therefore the disclosure in the background section may include some prior art that does not constitute a part of the knowledge of those skilled in the art. Furthermore, the disclosure in the "background" does not represent a material or problem to be solved by one or more embodiments of the present invention, nor is it a representation that has been known or appreciated by those skilled in the art prior to the filing of the present application.

SUMMERY OF THE UTILITY MODEL

The utility model provides a light guide plate which can improve the brightness and the light uniformity.

The utility model provides a light source module which can improve the brightness and the light uniformity and does not influence the taste of a display picture.

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, an embodiment of the utility model provides a light guide plate including a plate body, a plurality of first strip-shaped structures, and a plurality of second strip-shaped structures. The plate body is provided with a light incident surface and a light emergent surface, and the light emergent surface is adjacent to the light incident surface. The plurality of first strip structures are arranged on the light-emitting surface. The first strip-shaped structures extend from the light incidence surface to the extending direction far away from the light incidence surface, and the first strip-shaped structures are arranged along the arrangement direction. The extending direction is not parallel to the arrangement direction. The height of each first strip-shaped structure in the direction perpendicular to the light-emitting surface is gradually reduced along the extending direction. Any two adjacent first strip-shaped structures have a structure interval area between them. The plurality of second strip structures are arranged on the light-emitting surface. The second strip-shaped structures extend along the extension direction, and the second strip-shaped structures are arranged along the arrangement direction. At least one of the second strip-shaped structures is configured in a structure space region between any two adjacent first strip-shaped structures. A first space region is arranged between each adjacent first strip-shaped structure and each adjacent second strip-shaped structure, and a second space region is arranged between any two adjacent second strip-shaped structures. The widths of the first distance regions and the second distance regions at one side adjacent to the light incident surface are more than 0um and less than 10 μm.

In order to achieve one or a part of or all of the above or other objects, an embodiment of the utility model provides a light source module including a light emitting device and the light guide plate. The light-emitting element is arranged opposite to the light incident surface of the plate body.

In the light guide plate of the embodiment of the utility model, by gradually reducing the heights of the plurality of first strip-shaped structures in the direction perpendicular to the light emergent surface along the extending direction, the light concentration effect can be reduced when the light is transmitted to one end of the plate body far away from the light incident surface, the light can be dispersed to the dark band areas on the left side and the right side of the plate body, and the effects of improving the brightness of the dark band areas and the light uniformity of the whole light guide plate are further achieved. Under the condition that the light-emitting elements have different light-emitting intensities corresponding to the light-in surface, the light-emitting elements can also be adjusted to be proper gradual change parameters. Under the design structure of the light guide plate, the brightness and the light uniformity of the dark zone area can be improved, and meanwhile, the brightness of the bright zone area can be maintained to be not remarkably reduced. On the other hand, at least one of the second strip-shaped structures is arranged between any two adjacent first strip-shaped structures, so that the situation that uneven bright and dark line grains are generated on a display picture due to the height difference between the first strip-shaped structures and the light-emitting surface caused by overlarge space can be reduced. And the width of the first interval area and the second interval area at one side adjacent to the light incident surface is more than 0um and less than 10 μm, compared with the prior art which only uses the light guide plate with the progressive strip-shaped structure, the light guide plate can still maintain the effect of shielding the bright points in the range. The light source module of the embodiment of the utility model also has the effects of improving the brightness and the light uniformity of the dark zone area and not influencing the taste of the display picture due to the use of the light guide plate.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1 is a schematic perspective view of a light source module according to an embodiment of the utility model.

Fig. 2 is a schematic cross-sectional view of a light source module according to an embodiment of the utility model.

List of reference numerals

1: light source module

10 light guide plate

20 light emitting element

100: plate body

110 incident light surface

120, light-emitting surface

130. 140 side surface

150 bottom surface

200 first strip structure

300 second strip structure

400 diffusion microstructure

E direction of extension

H1, H11, H2 height

L is light

R is the arrangement direction

S structural spacing region

S1 first Interval region

S2 second distance area

W1, W2, WS1, WS11, WS2, WS21 width.

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 is used for purposes of illustration and is in no way limiting.

Fig. 1 is a schematic perspective view of a light source module according to an embodiment of the utility model. Fig. 2 is a schematic cross-sectional view of a light source module according to an embodiment of the utility model. Referring to fig. 1 and fig. 2, a light source module 1 of the present embodiment includes a light guide plate 10 and a light emitting device 20. The light guide plate 10 includes a plate body 100, a plurality of first strip structures 200 and a plurality of second strip structures 300. The plate body 100 has a light incident surface 110, a light emitting surface 120, two opposite side surfaces 130, 140 and a bottom surface 150, wherein the light emitting surface 120 is adjacent to the light incident surface 110, the side surface 130 is simultaneously connected to the light incident surface 110, the light emitting surface 120 and the bottom surface 150, the side surface 140 is also simultaneously connected to the light incident surface 110, the light emitting surface 120 and the bottom surface 150, and the light emitting surface 120 is opposite to the bottom surface 150. The light emitting element 20 is disposed opposite to the light incident surface 110 of the plate body 100, and is adapted to emit light L and emit light to the light incident surface 110. The first strip-shaped structures 200 and the second strip-shaped structures 300 are disposed on the light-emitting surface 120. The first strip-shaped structures 200 extend from the light incident surface 110 to the extending direction E away from the light incident surface 110, and the first strip-shaped structures 200 are arranged along the arrangement direction R, wherein the extending direction E is not parallel to the arrangement direction R. In the present embodiment, the extending direction E is, for example, perpendicular to the light incident surface 110, and the arrangement direction R is, for example, parallel to the light incident surface 110, that is, the extending direction E is perpendicular to the arrangement direction R, but not limited thereto. The plurality of second bar structures 300 extend toward the extending direction E, and the second bar structures 300 are arranged along the arrangement direction R. The number of the first stripe structures 200 and the second stripe structures 300 in fig. 1 and fig. 2 is only illustrative, and the utility model is not limited to the number of the first stripe structures 200 and the second stripe structures 300. In the present embodiment, the height of each first bar-shaped structure 200 in the direction perpendicular to the light emitting surface 120 is gradually decreased along the extending direction E, and the height of each second bar-shaped structure 300 in the direction perpendicular to the light emitting surface 120 is not changed.

The shapes of the first strip-shaped structures 200 and the second strip-shaped structures 300 may include a semi-cylindrical shape (as shown in fig. 1) and a triangular cylindrical shape, but the utility model is not limited to the shapes of the first strip-shaped structures 200 and the second strip-shaped structures 300, as long as the effects of controlling the light emitting direction and scattering light can be achieved. In the present embodiment, the plurality of first bar-shaped structures 200 and the plurality of second bar-shaped structures 300 are, for example, semi-cylindrical, but the first bar-shaped structures 200 and the second bar-shaped structures 300 may also be respectively selected to have different shapes according to different design requirements.

In detail, in the present embodiment, any two adjacent first stripe structures 200 have a structure pitch region S therebetween. The structure space region S between any two adjacent first strip-shaped structures 200 may enable the light L to be totally reflected in the structure space region S of the board body 100 and transmitted toward the inside of the board body 100 again, and relatively speaking, the plurality of first strip-shaped structures 200 may enable the light L to exit from the light exit surface 120 of the board body 100. However, it is considered that the arrangement of the plurality of first stripe structures 200 and the inter-structure space region S may cause the light source module 1 to generate uneven brightness after emitting light to the display panel (not shown) and have poor concealing performance. Therefore, in the light guide plate 10 of the present embodiment, at least one of the plurality of second strip-like structures 300 is disposed in the structure space region S between any two adjacent first strip-like structures 200, i.e., the number of the second strip-like structures 300 is, for example, greater than or equal to the number of the structure space regions S. Under the design, a part of light can still be transmitted to the dark zone area adjacent to the side surfaces 130 and 140 by total reflection generated by the configuration of the structural distance area S, and the other part of light can be emitted from the light guide plate 10 through the second strip-shaped structure 300, so that the situation of generating uneven bright and dark line lines on the display picture due to the structural distance area S is reduced, and the concealing performance of the light guide plate 10 is improved.

Specifically, a first spacing region S1 exists between each adjacent first stripe structure 200 and each adjacent second stripe structure 300, and a second spacing region S2 exists between any two adjacent second stripe structures 300. The width WS1 of the first distance region S1 at a side adjacent to the light incident surface 110 and the width WS2 of the second distance region S2 at a side adjacent to the light incident surface 110 are, for example, greater than 0um and less than 10 μm, and in a preferred embodiment, the width WS1 and the width WS2 are, for example, greater than 5um and less than 10 μm. Within this width range, the light guide plate 10 of the present embodiment can still maintain the effect of shielding the bright spots compared to the prior art that only uses the light guide plate with the progressive stripe structure. In addition, since the first bar-shaped structures 200 and the second bar-shaped structures 300 are not connected, and any two adjacent second bar-shaped structures 300 are not connected, the light-emitting surface 120 has a good uniform light effect, and the light-collecting characteristics of the first bar-shaped structures 200 and the second bar-shaped structures 300 are maintained (the higher the height of the bar-shaped microstructures is, the better the light-collecting effect is, the higher the light utilization rate is, but the high light-collecting effect causes uneven brightness), which is helpful for improving the dark angle phenomenon of the light-emitting surface 120 and the excessive concentration phenomenon of the emergent light beams. Moreover, when the bottom surface 150 of the light guide plate 10 is provided with the dots, the spacing regions between the stripe structures can also reduce the uneven brightness. Specifically, in the light emitting surface 120 of the present embodiment, other microstructures are not disposed except for the first bar structures 200 and the second bar structures 300, so that the good optical characteristics of the present embodiment can be maintained.

In the present embodiment, the width W1 of each first stripe structure 200 in the direction parallel to the arrangement direction R decreases along the extending direction E, and the width WS1 of the first spacing region S1 on the side adjacent to the light incident surface 110 is the same as the width WS2 of the second spacing region S2 on the side adjacent to the light incident surface 110. Under the above configuration, since the width W1 of each first bar-shaped structure 200 decreases along the extending direction E, and the width W2 of each second bar-shaped structure 300 in the parallel arrangement direction R is not changed, the first spacing region S1 forms a trapezoid region on the light emitting surface 120, and the width WS1 of the trapezoid region on the side adjacent to the light incident surface 110 is smaller than the width WS11 of the trapezoid region on the side away from the light incident surface 110. In addition, since the width W2 of each of the second stripe structures 300 is not changed, the second spacing regions S2 form rectangular regions on the light emitting surface 120, that is, the width WS2 of the second spacing regions S2 on the side adjacent to the light emitting surface 110 is the same as the width WS21 on the side away from the light emitting surface 110, and the area of the rectangular regions of the second spacing regions S2 is smaller than that of the trapezoidal regions of the first spacing regions S1.

In order to achieve the effect of improving the light uniformity, the first bar-shaped structures 200 and the second bar-shaped structures 300 are substantially disposed on the entire surface of the light emitting surface 120, except for the first spacing region S1, the second spacing region S2, and the spacing between the first bar-shaped structure 200 or the second bar-shaped structure 300 and the side surfaces 130 and 140. When the second stripe structure 300 is adjacent to the side surfaces 130 and 140, there may be no space between the second stripe structure 300 and the side surfaces 130 and 140, but the utility model is not limited thereto. When the first bar structures 200 are adjacent to the side surfaces 130 and 140, since the width W1 of the first bar structures 200 decreases along the extending direction E, even if one end adjacent to the light incident surface 110 is aligned with the side surfaces 130 and 140, a distance is generated between one end away from the light incident surface 110 and the side surfaces 130 and 140.

In the embodiment, one end of each of the first strip-shaped structures 200 and the second strip-shaped structures 300 is connected to the edge of the light emitting surface 120 adjacent to one side of the light incident surface 110, and the other end of each of the first strip-shaped structures 200 and the second strip-shaped structures 300 is connected to the edge of the light emitting surface 120 away from one side of the light incident surface 110. In detail, in the present embodiment, the height of each first bar-shaped structure 200 in the direction perpendicular to the light emitting surface 120 is gradually decreased along the extending direction, and the height H2 of each second bar-shaped structure 300 in the direction perpendicular to the light emitting surface 120 is not changed. The height H1 of each first bar-shaped structure 200 at the side adjacent to the light incident surface 110 is greater than the height H2 of each second bar-shaped structure 300, whereas the height H11 of each first bar-shaped structure 200 at the side away from the light incident surface 110 is equal to or less than the height H2 of each second bar-shaped structure 300, which is exemplified by the height H11 being equal to the height H2 in fig. 1. Under the above configuration, the light L has a higher light-collecting effect in the region close to the light incident surface 110, and when the light L is transmitted to the end of the plate body 100 away from the light incident surface 110, the light L can reduce the light-collecting effect, so that the light L can be dispersed to the dark band regions (dark corner phenomenon) on the left and right sides of the plate body 100 close to the side surfaces 130 and 140, and the light emission can be further adjusted by the plurality of second strip structures 300 disposed in the structure space region S, thereby achieving the effect of improving the brightness of the dark region of the light emitting surface 120 and the light uniformity of the light guide plate 10 as a whole.

Further, the light guide plate 10 further includes a plurality of diffusion microstructures 400 disposed on the bottom surface 150, for example. In the present embodiment, the diffusion microstructures 400 can be dots or other microstructures capable of diffusing light. For example, in order to improve the light uniformity, the height of each of the first stripe structures 200 is gradually decreased along the extending direction E, however, at the same time, the light-emitting brightness of the end of the plate body 100 adjacent to the light-incident surface 110 may be greater than that of the end of the plate body 100 away from the light-incident surface 110. Therefore, the distribution density of the plurality of diffusion microstructures 400 can be designed to be gradually increased along the extending direction E, so that the brightness of the dark band regions on the left and right sides of the side surfaces 130 and 140 can be improved, and the light uniformity of the whole light guide plate 10 can also be improved. However, the distribution density of the plurality of diffusion microstructures 400 can be adjusted according to different design requirements or different optical effect requirements, and the utility model is not limited thereto.

In the present embodiment, the heights H1 and the widths W1 of the first stripe structures 200 are gradually decreased along the extending direction E. In a specific range, the height H1 of the first stripe structures 200 at the end adjacent to the light incident surface 110 is 5 μm to 20 μm, the height H11 at the end far from the light incident surface 110 is 0.5 μm to 3 μm, and the width W1 of the first stripe structures 200 at the end adjacent to the light incident surface 110 is 30 μm to 150 μm, and the width at the end far from the light incident surface 110 is 10 μm to 50 μm. In addition, the height H2 and the width W2 of the second stripe structures 300 are not changed along the extending direction E. Specifically, the height H2 of the second stripe structures 300 is 0.5 μm to 3 μm, and the width W2 is 10 μm to 50 μm.

In the present embodiment, the light emitting element 20 includes a plurality of point light sources 20, such as, but not limited to, Light Emitting Diodes (LEDs). The light emitting elements 20 can also be other kinds of light source assemblies, such as a lamp tube, and the utility model is not limited to the kind of light source. In addition, the number of the light emitting elements 20 in fig. 1 is merely illustrative, and the present invention is not particularly limited to the number of the light emitting elements 20.

In summary, in the light guide plate according to the embodiment of the utility model, by gradually decreasing the heights of the plurality of first strip-shaped structures in the direction perpendicular to the light exit surface along the extending direction, when light is transmitted to the end of the plate body far away from the light entrance surface, the light concentration effect can be reduced, so that the light can be dispersed to the dark band regions on the left and right sides of the plate body, and the effects of improving the brightness of the dark band regions and the light uniformity of the light guide plate as a whole are achieved. Under the condition that the light-emitting elements have different light-emitting intensities corresponding to the light-in surface, the light-emitting elements can also be adjusted to be proper gradual change parameters. Under the design structure of the light guide plate, the brightness and the light uniformity of the dark zone area can be improved, and meanwhile, the brightness of the bright zone area can be maintained to be not remarkably reduced. On the other hand, at least one of the second strip-shaped structures is arranged between any two adjacent first strip-shaped structures, so that the situation that uneven bright and dark line grains are generated on a display picture due to the height difference between the first strip-shaped structures and the light-emitting surface caused by overlarge space can be reduced. And the width of the first interval area and the second interval area at one side adjacent to the light incident surface is more than 0um and less than 10 μm, compared with the prior art which only uses the light guide plate with the progressive strip-shaped structure, the light guide plate can still maintain the effect of shielding the bright points in the range. The light source module of the embodiment of the utility model also has the effects of improving the brightness and the light uniformity of the dark zone area and not influencing the taste of the display picture due to the use of the light guide plate.

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. Moreover, it is not necessary for any embodiment or claim of the utility model to achieve all of the objects or advantages or features disclosed herein. Furthermore, the abstract and the title of the specification are provided to assist 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 (10)

1. The light guide plate comprises a plate body, a plurality of first strip-shaped structures and a plurality of second strip-shaped structures, wherein the first strip-shaped structures are arranged on the plate body in a parallel manner

The plate body is provided with a light incident surface and a light emergent surface, and the light emergent surface is adjacent to the light incident surface;

the plurality of first strip-shaped structures are arranged on the light emitting surface, extend from the position close to the light incident surface to the extending direction far away from the light incident surface, are arranged along the arrangement direction, are not parallel to the arrangement direction, gradually decrease in height in the direction perpendicular to the light emitting surface along the extending direction, and have a structure space region between any two adjacent first strip-shaped structures; and

the plurality of second strip-shaped structures are arranged on the light-emitting surface, the plurality of second strip-shaped structures extend in the extending direction, the plurality of second strip-shaped structures are arranged in the arrangement direction, any two adjacent first strip-shaped structures are arranged between the plurality of first strip-shaped structures in the structure interval region, at least one of the plurality of second strip-shaped structures is arranged between the plurality of first strip-shaped structures, the adjacent first strip-shaped structures and the second strip-shaped structures are arranged in the first interval region, any two adjacent second strip-shaped structures are arranged in the second interval region, the first interval region and the second interval region are adjacent to one side of the light-in surface, the width of the first interval region is larger than 0um and smaller than 10 μm.

2. The light guide plate according to claim 1, wherein the extending direction is perpendicular to the light incident surface, and the arrangement direction is parallel to the light incident surface.

3. The light guide plate according to claim 1, wherein a width of each of the first stripe structures in a direction parallel to the arrangement direction decreases along the extension direction, and widths of the first and second pitch regions on a side adjacent to the light incident surface are the same.

4. The light guide plate according to claim 1, wherein a height of the first strip-shaped structures at an end away from the light incident surface is equal to or less than a height of the second strip-shaped structures in a direction perpendicular to the light emitting surface.

5. The light guide plate according to claim 1, wherein the first and second stripe structures have a semi-cylindrical shape and a triangular cylindrical shape.

6. The light guide plate as claimed in claim 1, wherein the first pitch regions form a trapezoid region on the light exit surface, and a width of a side of the trapezoid region adjacent to the light entrance surface is smaller than a width of a side of the trapezoid region away from the light entrance surface.

7. The light guide plate according to claim 1, wherein the second pitch region forms a rectangular region on the light emitting surface.

8. The light guide plate according to claim 1, wherein the first stripe structures have a height of 5 μm to 20 μm at an end adjacent to the light incident surface, the first stripe structures have a height of 0.5 μm to 3 μm at an end away from the light incident surface, and the second stripe structures have a height of 0.5 μm to 3 μm in a direction perpendicular to the light emitting surface.

9. The light guide plate according to claim 1, wherein the width of the first stripe structures parallel to the arrangement direction is 30 μm to 150 μm at an end adjacent to the light incident surface, the width of the first stripe structures is 10 μm to 50 μm at an end away from the light incident surface, and the width of the second stripe structures is 10 μm to 50 μm parallel to the arrangement direction.

10. A light source module comprises a light guide plate and a light emitting element, wherein

The light guide plate comprises a plate body, a plurality of first strip-shaped structures and a plurality of second strip-shaped structures, wherein the plate body is provided with a light incident surface and a light emergent surface, and the light emergent surface is adjacent to the light incident surface;

the plurality of first strip-shaped structures are arranged on the light emitting surface, extend from the position close to the light incident surface to the extending direction far away from the light incident surface, are arranged along the arrangement direction, are not parallel to the arrangement direction, gradually decrease in height in the direction perpendicular to the light emitting surface along the extending direction, and have a structure space region between any two adjacent first strip-shaped structures; and

the plurality of second strip-shaped structures are arranged on the light-emitting surface, the plurality of second strip-shaped structures extend along the extending direction, the plurality of second strip-shaped structures are arranged along the arrangement direction, any two adjacent first strip-shaped structures are arranged between the plurality of first strip-shaped structures at intervals, at least one of the plurality of second strip-shaped structures is arranged between the plurality of first strip-shaped structures, any two adjacent first strip-shaped structures and each of the plurality of second strip-shaped structures have a first interval area, any two adjacent second strip-shaped structures have a second interval area, the first interval area reaches the second interval area, the width of one side, adjacent to the light-incident surface, of the second interval area is larger than 0um and smaller than 10 μm: and the light-emitting element is arranged opposite to the light incident surface of the plate body.

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