TWI752721B - Light guide plate and light source device - Google Patents

Abstract

A light guide plate and a light source device including the light guide plate are provided. The light guide plate is suitable for guiding a plurality of light beams. The light guide plate has a light incident surface and a first surface. The first surface is connected to the light incident surface. The light guide plate has a first region and a second region on the first surface. Compared with the second region, the first region is closer to the light incident surface. In the first region, a plurality of first microstructures are provided. Each of the first microstructures has a first curvature and is a crescent-shaped microstructure with a first ridge, and the first curvature is a curvature of the first ridge. In the second region, a plurality of second microstructures are provided. Each of the second microstructure has a second curvature, and the maximum value of the plurality of first curvatures is greater than the maximum value of the plurality of second curvatures.

Description

Light guide plate and light source device

The present invention relates to an optical element and an optical device, and in particular, to a light guide plate and a light source device.

Current light source devices can be mainly classified into edge light source devices and direct light source devices. The edge light source device uses the light guide plate to guide the light emitted by the light source disposed on the light incident side of the light guide plate to the light emitting surface of the light guide plate, thereby forming a surface light source. Generally speaking, an optical microstructure for displaying a specific pattern can be formed on the surface of the light guide plate to form a lighting device with a patterned lighting effect.

However, since the light sources used in the light source device are multiple point light sources (eg, LEDs), the optical microstructures are linear rod-shaped microstructures, and the linear rod-shaped microstructures only reflect incident light in the vertical direction, therefore, from the light source The light will also have high directivity after being reflected by the optical microstructure. Therefore, the distance between the point light sources will easily lead to a hot-spot phenomenon, thereby affecting the image quality of the lighting pattern.

However, when performing local dimming of the lighting device, that is, by controlling the on/off of different point light sources, the brightness difference of different sections on the surface of the light guide plate is controlled. Also, since the linear rod-shaped microstructures only reflect incident light in the vertical direction, when the surface of the light guide plate is provided with more linear rod-shaped microstructures, the brightness of different partitions on the surface of the light guide plate will appear different. The difference is more obvious. Therefore, the linear rod-shaped microstructure helps to improve the local dimming (Local Dimming) capability of the lighting device. Therefore, how to take into account the local dimming capability of the lighting device and the image quality of the lighting pattern is a problem that the relevant technicians need to consider and solve.

The "prior art" paragraph is only used to help understand the present disclosure, so the content disclosed in the "prior art" paragraph may contain some that do not constitute the prior art known to those with ordinary skill in the art. The content disclosed in the "prior art" paragraph does not represent the content or the problem to be solved by one or more embodiments of the present invention, and has been known or recognized by those with ordinary knowledge in the technical field before the application of the present invention.

The invention provides a light guide plate, which can be used to improve the local dimming capability of the light source device and reduce the hot spot phenomenon.

The invention provides a light source device, which has good local dimming capability and can clearly switch and display different optical patterns.

Other objects and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

In order to achieve one or part or all of the above purposes or other purposes, an embodiment of the present invention provides a light guide plate. The light guide plate is suitable for guiding a plurality of light beams. The beams are respectively provided by a plurality of light emitting elements, and the plurality of light emitting elements are arranged along the first direction. The light guide plate has a light incident surface and a first surface, the first surface is connected with the light incident surface, and the light guide plate has a first area and a second area on the first surface, and the first area is closer to the light incident than the second area noodle. In the first area, a plurality of first microstructures are provided, and the tangential direction of each first microstructure facing the central portion of the light incident surface is parallel to the first direction. Each of the first microstructures has a first curvature, and the first microstructures are crescent-shaped microstructures with a first ridge line, and the first curvature is the curvature of the first ridge line. In the second region, a plurality of second microstructures are provided, wherein each second microstructure has a second curvature, and the maximum value of the plurality of first curvatures is greater than the maximum value of the plurality of second curvatures.

In order to achieve one or part or all of the above objectives or other objectives, an embodiment of the present invention provides a light source device. The light source device includes a light source and the aforementioned light guide plate. The light source includes a plurality of light-emitting elements, the plurality of light-emitting elements are adapted to provide a plurality of light beams, and the plurality of light-emitting elements are arranged along the first direction. The light beam exhibits a predetermined pattern after leaving the light guide plate through the first microstructure and the second microstructure.

In an embodiment of the present invention, the light beam has an optical axis direction, and an extension line extending from a midpoint between adjacent light emitting elements along a direction parallel to the optical axis direction divides the responsibility of each light emitting element lighting area.

In an embodiment of the present invention, each of the above-mentioned first microstructures has a first optical surface and a third optical surface, the first optical surface faces the light incident surface, the third optical surface faces away from the light incident surface, and each first microstructure The first optical surface and the third optical surface of the structure are connected to each other to form a first ridge line.

In an embodiment of the present invention, a plurality of the above-mentioned plurality of first microstructures The first curvature gradually decreases from the side close to the light incident surface to the side away from the light incident surface.

In an embodiment of the present invention, each of the above-mentioned second microstructures is a crescent-shaped microstructure, and has a second optical surface and a fourth optical surface, the second optical surface faces the light incident surface, and the fourth optical surface faces away from the light incident surface. The light incident surface, the second optical surface and the fourth optical surface of each second microstructure are connected to each other to form a second ridge line, the second curvature is the curvature of the second ridge line, and a plurality of second The curvature gradually decreases from the side close to the light incident surface to the side far from the light incident surface.

In an embodiment of the present invention, the above-mentioned first curvature is a fixed value.

In an embodiment of the present invention, each of the above-mentioned second microstructures is a rod-shaped microstructure, the second curvature is zero, and a plurality of second microstructures are further arranged in the first sub-illumination area.

In an embodiment of the present invention, the above-mentioned light guide plate is further provided with a plurality of first microstructures in the second sub-illumination area, and the number ratio of the second microstructures in the second sub-illumination area is larger than that of the second sub-illumination area The number ratio of the first microstructures in the illuminated area.

In an embodiment of the present invention, the above-mentioned first microstructures are only disposed in the first sub-illumination area.

In an embodiment of the present invention, the above-mentioned first microstructure and second microstructure are recessed into the first surface.

In an embodiment of the present invention, the above-mentioned light source device further includes a plurality of condensing lenses, which are respectively disposed corresponding to the plurality of light-emitting elements.

In order to achieve one or part or all of the above-mentioned purposes or other purposes, the present invention An embodiment of the invention provides a light guide plate, which is suitable for guiding a plurality of light beams. The light guide plate has a light incident surface and a first surface, the first surface is connected with the light incident surface, and the light guide plate has a first area and a second area on the first surface, and the first area is closer to the light incident than the second area noodle. In the first region, a plurality of first microstructures are provided. Each of the first microstructures has a first curvature, and the first microstructures are crescent-shaped microstructures with a first ridge line, and the first curvature is the curvature of the first ridge line. In the second region, a plurality of second microstructures are provided, wherein each second microstructure has a second curvature, and the maximum value of the plurality of first curvatures is greater than the maximum value of the plurality of second curvatures. The light guide plate also has a first side, the first side is opposite to the light incident surface, the first surface is connected to the light incident surface and the first side, and the light guide plate has a center line on the first surface, and a space between the light incident surface and the center line is provided. The distance is equal to the distance between the first side and the center line. The first surface of the light guide plate forms a first area between the light incident surface and the center line, and the first surface of the light guide plate forms between the first side and the center line. In the second region, each of the second microstructures is a rod-shaped microstructure, the second curvature is zero, a plurality of second microstructures are also arranged in the first region, and the second microstructures in the first region are The quantity ratio is smaller than the quantity ratio of the first microstructures in the first area, a plurality of first microstructures are also arranged in the second area, and the quantity ratio of the second microstructures in the second area is larger than that in the second area The number ratio of the first microstructure.

In order to achieve one or part or all of the above objectives or other objectives, an embodiment of the present invention provides a light guide plate, which is suitable for guiding a plurality of light beams. The light guide plate has a light incident surface and a first surface, the first surface is connected with the light incident surface, and the light guide plate has a first area and a second area on the first surface, and the first area is compared with the second area The domain is closer to the incident surface. In the first region, a plurality of first microstructures are provided. Each of the first microstructures has a first curvature, and the first microstructures are crescent-shaped microstructures with a first ridge line, and the first curvature is the curvature of the first ridge line. In the second region, a plurality of second microstructures are provided, wherein each second microstructure has a second curvature, and the maximum value of the plurality of first curvatures is greater than the maximum value of the plurality of second curvatures. A plurality of light beams enter the light guide plate from the light incident surface and extend along the light emitting angle to form a plurality of illumination areas on the first surface respectively, and each illumination area includes a first sub-illumination area and a second sub-illumination area, and the first sub-illumination area is an area where each lighting area does not overlap with other lighting areas, the second sub-illumination area is an area where adjacent lighting areas overlap each other, the first sub-illumination area is the first area, and the second sub-illumination area is the second area.

In order to achieve one or part or all of the above objectives or other objectives, an embodiment of the present invention provides a light source device. The light source device includes a light source and the aforementioned light guide plate. The light source includes a plurality of light beams suitable for providing a plurality of light beams, and the light beams present a preset pattern after leaving the light guide plate through the first microstructure and the second microstructure.

Based on the above, the embodiments of the present invention have at least one of the following advantages or effects. In the embodiment of the present invention, since the first microstructure close to the light incident side is a crescent-shaped microstructure, it can reflect light in a wide angle range, so the hot spot phenomenon can be effectively eliminated. On the other hand, in this embodiment, the second microstructure away from the light incident side is a crescent-shaped microstructure with a small curvature or a rod-shaped microstructure with a curvature equal to zero, so that the incident light that can be reflected is limited to only For incident light from near the vertical direction. In this way, the second microstructures located on the responsible lighting area of each light-emitting element will not reflect the light beam from the adjacent responsible lighting area, but help to enhance the light The local dimming capability of the source device. In this way, through the configuration of the first microstructure and the second microstructure, the light guide plate and the light source device can realize the capability of local dimming and maintain the image quality of the lighting pattern.

In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, the following embodiments are given and described in detail with the accompanying drawings as follows.

100, 300, 500: light guide plate

110, 310: The first microstructure

120, 320: Second Microstructure

200, 200A, 200B, 400, 600: light source device

210: The first light source

220: Second light source

CL: condenser lens

D1: first direction

D2: Second direction

D3: third direction

E: extension cord

IL: Lighting area

IL1: The first sub-illumination area

IL2: Second sub lighting area

LE: light-emitting element

M: midline

O: Optical axis direction

OS1: The first optical surface

OS2: Second Optical Surface

OS3: Third Optical Surface

OS4: Fourth Optical Surface

R110, R510: The first area

R120, R520: The second area

RIL: Responsible Lighting Area

S1: first surface

SI1: The first light incident surface

SI2: The second light incident surface

SR1: First Ridgeline

SR2: Second Ridgeline

SS1: first side

FIG. 1 is a schematic structural diagram of a light source device according to an embodiment of the present invention.

FIG. 2A is a partial structural schematic diagram of the light source device of FIG. 1 .

FIG. 2B is a schematic structural diagram of a microstructure of FIG. 2A .

FIG. 2C is a schematic diagram of luminance simulation of the light source device of FIG. 2A .

FIG. 2D is a schematic diagram of luminance simulation of a light source device according to a comparative example of the present invention.

3 to 6 are partial structural schematic diagrams of light source devices according to other different embodiments of the present invention.

The foregoing and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or rear, etc., are only for referring to the directions of the attached drawings. Accordingly, the directional terms used are illustrative and not limiting of the present invention.

FIG. 1 is a schematic structural diagram of a light source device according to an embodiment of the present invention. Referring to FIG. 1 , the light source device 200 of this embodiment includes a light guide plate 100 , a first light source 210 and a second light source 220 . For example, in this embodiment, the first light source 210 and the second light source 220 can be light bars including a plurality of light emitting elements LE, and are suitable for providing a plurality of light beams, wherein the light emitting elements LE are, for example, light emitting diodes ( light emitting diode, LED) components or other types of light-emitting components. For example, in this embodiment, the light guide plate 100 is suitable for guiding light beams, and the light guide plate 100 includes a plurality of microstructures (not shown) for displaying the first pattern and a plurality of microstructures for displaying the second pattern Microstructure (not shown). In addition, in this embodiment, the microstructure for displaying the first pattern extends along the first direction D1, the microstructure for displaying the second pattern extends along the second direction D2, and the normal direction of the light guide plate 100 is defined For the third direction D3. In this way, when the light source device 200 switches the first light source 210 to the on state and switches the second light source 220 to the off state, the light source device 200 is suitable for displaying the first pattern, and when the light source device 200 switches the second light source 220 to the on state and switches When the first light source 210 is turned off, the light source device 200 is suitable for displaying the second pattern.

In more detail, as shown in FIG. 1 , the light guide plate 100 has a first light incident surface SI1, a second light incident surface SI2 and a first surface S1, wherein the first light incident surface SI1 is adjacent to the second light incident surface SI2, And the first surface S1 is connected to the first light incident surface SI1 and the second light incident surface SI2. The plurality of microstructures for displaying the first pattern and the plurality of microstructures for displaying the second pattern are located on the first surface S1. For example, in this embodiment, the first surface S1 is, for example, the lower surface of the light guide plate 100 , that is, as shown in FIG. 2A , in this embodiment, a plurality of microstructures for displaying the first pattern with multiple to display The microstructures of the second pattern are all located on the lower surface of the light guide plate 100 , but the invention is not limited thereto. In other embodiments, the first surface S1 can also be the upper surface of the light guide plate 100 , that is, a plurality of microstructures for displaying the first pattern and a plurality of microstructures for displaying the second pattern can also be located on the light guide plate 100 on the upper surface.

2A to 2B, when the light source device 200 displays the first pattern, the structure of the light guide plate 100 for achieving its local dimming capability will be further explained. In addition, it is also worth noting that although the microstructures used to display the first pattern and the microstructures used to display the second pattern are disposed on the first surface S1 of the light guide plate 100 in different extending directions, they are used to display the first pattern. For the microstructure of one pattern and the microstructure used to display the second pattern, the limitation range in optical design can be regarded as the same. Therefore, in order to avoid the lengthy description, the following is only for the light source device 200 when the first pattern is displayed. The manner in which the microstructures of the first pattern are displayed will be described. However, those skilled in the art can refer to the arrangement method so that the microstructures used for displaying the second pattern can achieve similar effects in a manner with similar arrangement, which will not be repeated hereafter.

FIG. 2A is a partial structural schematic diagram of the light source device of FIG. 1 . Further, FIG. 2A shows the light guide plate 100 (presented from a viewing angle where the first surface S1 can be seen) and the first light source 210 as a light source. FIG. 2B is a schematic structural diagram of a microstructure of FIG. 2A . As shown in FIG. 2A , the light beams emitted by the plurality of light-emitting elements LE of the first light source 210 have an optical axis direction O, and the light beams emitted from the midpoint between the adjacent light-emitting elements LE along a direction parallel to the optical axis direction O The extended extension line E defines the responsible lighting area RIL of each light-emitting element LE. The light guide plate 100 has a first area on the first surface S1 The region R110 and the second region R120, the first region R110 is closer to the first light incident surface SI1 than the second region R120. More specifically, in this embodiment, the light guide plate 100 further has a first side surface SS1, the first side surface SS1 is opposite to the first light incident surface SI1, and the first surface S1 connects the first light incident surface SI1 and the first side surface SS1. , and the light guide plate 100 has a center line M on the first surface S1, the distance between the first light incident surface SI1 and the center line M is equal to the distance between the first side SS1 and the center line M, and the first light guide plate 100 has a center line M. A surface S1 forms a first region R110 between the first light incident surface SI1 and the center line M, and the first surface S1 of the light guide plate 100 forms a second region R120 between the first side surface SS1 and the center line M.

Specifically, in this embodiment, the light guide plate 100 is provided with a plurality of first microstructures 110 in the first region R110 , and each of the first microstructures 110 has a first curvature. In the second region R120, a plurality of second microstructures 120 are provided, wherein each of the second microstructures 120 has a second curvature. In detail, the first microstructure 110 is a crescent-shaped microstructure having a first ridge line SR1, and the first curvature is the curvature of the first ridge line SR1. For example, the first ridge line SR1 is a circular arc line. Each of the first microstructures 110 has a first optical surface OS1 and a third optical surface OS3, the first optical surface OS1 faces the first light incident surface SI1, the third optical surface OS3 faces away from the first light incident surface SI1, and each first optical surface OS1 faces the first light incident surface SI1. The first optical surface OS1 and the third optical surface OS3 of the structure 110 are connected to each other to form a first ridge line SR1. The plurality of first curvatures of the plurality of first microstructures 110 gradually decrease from the side close to the first light incident surface SI1 to the side away from the first light incident surface SI1 .

On the other hand, the second microstructure 120 is also a crescent-shaped microstructure and has a second ridge line SR2, and the second curvature is the curvature of the second ridge line SR2. The second ridge line SR2 is arc line. Each second microstructure 120 has a second optical surface OS2 and a fourth optical surface OS4, the second optical surface OS2 faces the first light incident surface SI1, the fourth optical surface OS4 faces away from the first light incident surface SI1, and each second optical surface OS2 faces the first light incident surface SI1. The second optical surface OS2 and the fourth optical surface OS4 of the structure 120 are connected to each other to form a second ridge SR2, and the plurality of second curvatures of the plurality of second microstructures 120 are from the side close to the first light incident surface SI1 to the side away from the first light incident surface SI1. The light incident surface SI1 side gradually decreases.

Also, in this embodiment, the maximum value of the plurality of first curvatures is greater than the maximum value of the plurality of second curvatures. Here, the magnitude of the curvature is the inverse of the radius of curvature passing through a certain point of the ridge line. In other words, when the curvature of the first ridge line SR1 or the second ridge line SR2 is smaller, as it approaches zero, the first ridge line SR1 or the second ridge line SR2 is closer to a straight line. Conversely, when the curvature of the first ridge line SR1 or the second ridge line SR2 is larger, the edge of the ridge line SR1 or the second ridge line SR2 is closer to an arc shape, and can be used to reflect light in a larger angle range. The first microstructure 110 and the second microstructure 120 are, for example, recessed into the first surface S1 of the light guide plate 100 , but the invention is not limited thereto. On the other hand, after the light beam exits the light guide plate 100 through the first microstructure 110 and the second microstructure 120, a predetermined pattern (eg, a first pattern) is displayed. In detail, the first microstructures 110 and the second microstructures 120 are arranged to form microstructures for displaying a first pattern, and are suitable for the light beams passing through the first microstructures 110 and the second microstructures 120 to appear In the first pattern, the light showing the first pattern is emitted from the first optical surface OS1 of the first microstructure 110 and the second optical surface OS2 of the second microstructure 120 .

Thus, in this embodiment, since the first microstructure 110 near the light incident side is a crescent-shaped microstructure with a larger curvature, and the closer to the light incident side, the greater the curvature, Therefore, it can reflect light in a wide range of angles, so it can effectively eliminate the hot spot phenomenon. On the other hand, in this embodiment, the second microstructure 120 away from the light incident side is a crescent-shaped microstructure with a smaller curvature, and the further away from the light incident side, the smaller the curvature and the better the optical behavior. Approaching the rod-like microstructure, the incident light that it can reflect will be limited to incident light from near the vertical direction. In this way, the second microstructures 120 located on the responsible lighting area RIL of each light emitting element LE will not reflect the light beams from the adjacent responsible lighting area RIL, which helps to improve the local dimming capability of the light source device 200 . Moreover, since the light beam emitted by the light-emitting element LE corresponding to the adjacent responsible lighting area RIL will not diverge outside its responsible lighting area RIL when it is close to the light incident side, even if the first microstructure close to the light incident side 110 is a crescent-shaped microstructure with a relatively large curvature, which does not affect the local dimming capability of the light source device 200 .

In this way, through the configuration of the first microstructure 110 and the second microstructure 120 , the light source device 200 can realize the local dimming capability and maintain the image quality of the lighting pattern. More specifically, FIG. 2C is a schematic diagram of luminance simulation of the light source device 200 of FIG. 2A . As shown in FIG. 2C , when the light-emitting element LE of the light source device 200 is lit, the crescent-shaped microstructure with a small curvature away from the light incident side on the light guide plate will reduce the probability of reflecting the light beam from the adjacent responsible lighting area RIL. The area of the light guide plate away from the light incident side can reduce the overlapping area of the light beams provided by the adjacent light emitting elements LE, thus helping to improve the effect of local dimming. On the contrary, FIG. 2D is a schematic diagram of luminance simulation of a light source device of a comparative example. The light source device of this comparative example is only provided with a crescent-shaped microstructure with a fixed curvature, which is used to reflect the light beam provided by the light-emitting element LE, and is The curvature of the microstructure used in this comparative example is the curvature of the microstructure closest to the light incident side of the light guide plate in the light source device 200 of FIG. 2A , that is, the largest one of the first curvatures of the first microstructures 110 . As shown in FIG. 2D , when the light-emitting element LE of the light source device in FIG. 2D is turned on, since the crescent-shaped microstructure with a fixed curvature can reflect light in a wide angle range, the light guide plate is far away from the light-incident side. The local dimming effect is less pronounced compared to the case of Figure 2C.

In addition, it is worth noting that in the foregoing embodiments, although the first microstructure 110 and the second microstructure 120 are both shown as crescent-shaped microstructures as examples, the present invention is not limited to this, and in other In an embodiment, the second microstructures 120 can also be rod-shaped microstructures. Further explanation will be given below in conjunction with FIG. 3 and FIG. 4 .

FIG. 3 is a partial structural schematic diagram of another light source device of the present invention. Referring to FIG. 3 , the light guide plate 300 and the light source device 400 of this embodiment are similar to the light guide plate 100 and the light source device 200 of FIG. 2A , and the differences between them are as follows. In this embodiment, the first microstructure 310 is a crescent-shaped microstructure, the second microstructure 320 is a rod-shaped microstructure, and the first curvature and the second curvature are fixed values. In other words, in this embodiment, the first curvature is greater than zero, and the second curvature is equal to zero. In addition, a plurality of second microstructures 320 may also be provided in the first region R110, a plurality of first microstructures 310 may also be provided in the second region R120, and the second microstructures in the first region R110 The number ratio of the structures 320 is smaller than the number ratio of the first microstructures 310 in the first region R110, and the number ratio of the second microstructures 320 in the second region R120 is greater than that of the first microstructures 310 in the second region R120. quantity ratio.

In this way, in this embodiment, since the first region R110 close to the light incident side The number ratio of the first microstructures 310 in R110 is greater than the number ratio of the second microstructures 320 . Therefore, most of the microstructures in the first region R110 can reflect light in a wide range of angles, so the hot spot phenomenon can also be effectively eliminated. On the other hand, in this embodiment, the number ratio of the second microstructures 320 in the second region R120 away from the light incident side is greater than the number ratio of the first microstructures 310 , therefore, most of the incident light entering the second region R120 It will still be reflected by the second microstructure 320, and the second microstructure 320 only reflects the incident light from the vicinity of the vertical direction. In this way, the microstructures located on the responsible lighting area RIL of each light emitting element LE do not reflect the light beams from the adjacent responsible lighting area RIL, but help to improve the local dimming capability of the light source device 200 . In this way, through the configuration of the first microstructures 310 and the second microstructures 320 , the light guide plate 300 and the light source device 400 can realize the local dimming capability and maintain the image quality of the lighting pattern, and achieve the same performance as the aforementioned light guide plate 100 and the light source device. The similar effects and advantages of 200 will not be repeated here.

FIG. 4 is a partial structural schematic diagram of another light source device of the present invention. Referring to FIG. 4 , the light guide plate 500 and the light source device 600 of this embodiment are similar to the light guide plate 300 and the light source device 400 of FIG. 3 , and the differences between them are as follows. In this embodiment, the division manner of the first region R510 and the second region R520 of the light source device 600 is different from the division manner of the first region R110 and the second region R120 of the light source device 400 in FIG. 3 . In this embodiment, a plurality of light beams enter the light guide plate 100 from the first light incident surface SI1 and then extend along the emission angle to form a plurality of illumination areas IL on the first surface S1, and each illumination area IL includes a first sub-illumination The area IL1 and the second sub-illumination area IL2, and the first sub-illumination area IL1 is the lighting area IL that is not connected to other lighting areas IL. The overlapping area, the second sub-illumination area IL2 is an area where adjacent illumination areas IL overlap each other, the first sub-illumination area IL1 is the first area R510, and the second sub-illumination area IL2 is the second area R520. The first region R510 is closer to the first light incident surface SI1 than the second region R520. In addition, the extension line E passes through the end point on the side closest to the first light incident surface SI1 in the second sub-illumination area IL2. A plurality of second microstructures 320 are also disposed in the first sub-illumination area IL1 , but the number ratio of the second microstructures 320 is lower as it is closer to the light incident side.

In this way, since the first microstructure 310 is provided in the first region R510, the hot spot phenomenon can also be effectively eliminated. On the other hand, in this embodiment, the second region R520 is only provided with the second microstructures 320, so the incident light from different light-emitting elements LE is only reflected by the second microstructures 320, and the second microstructures 320 Structure 320 also reflects only incident light from near the vertical. In this way, the microstructures located on the responsible lighting region RIL of each light emitting element LE do not reflect the light beams from the adjacent responsible lighting regions RIL, but help to improve the local dimming capability of the light source device 600 . In this way, through the configuration of the first microstructures 310 in the first region R510 and the second microstructures 320 in the second region R520, the light guide plate 500 and the light source device 600 can realize the local dimming capability and maintain the lighting image quality of the pattern, and achieves similar effects and advantages as the aforementioned light guide plate 300 and the light source device 400 , which will not be repeated here.

In addition, as shown in FIG. 4 , in this embodiment, the second sub-illumination area IL2 is only provided with the second microstructures 320 , that is, the first microstructures 310 are only provided in the first sub-illumination area IL1 , but The present invention is not limited to this. In another embodiment not shown In the second sub-illumination area IL2, a plurality of first microstructures 310 may also be provided, and the number ratio of the second microstructures 320 in the second sub-illumination area IL2 is greater than that of the first microstructures 320 in the second sub-illumination area IL2. A number ratio of microstructures 310 . For example, the number of the second microstructures 320 accounts for 70%-100% of the total number of microstructures in the second sub-illumination area IL2, and the number of the first microstructures 310 accounts for the total number of microstructures in the second sub-illumination area IL2 0%~30%.

In this way, as long as the number of the first microstructures 110 in the second sub-illumination area IL2 falls within the above-mentioned ratio range, the possibility of the first microstructures 110 reflecting the light beam from the adjacent responsible illumination area RIL can be reduced. In this way, the configuration of the first microstructure 110 and the second microstructure 120 can also enable the light guide plate 500 and the light source device 600 to achieve local dimming capability and maintain the image quality of the lighting pattern, and achieve the aforementioned effects and advantages. This will not be repeated here.

FIG. 5 and FIG. 6 are partial structural schematic diagrams of two other light source devices according to the present invention, respectively. Referring to FIGS. 5 and 6 , the light source devices 200A and 200B of this embodiment are similar to the light source device 200 of FIG. 2A , and the differences are as follows. In the embodiments of FIGS. 5 and 6 , the light source devices 200A and 200B further include a plurality of condenser lenses CL, which are respectively disposed corresponding to the light emitting elements LE and located between the light emitting elements LE and the first region R110 . More specifically, the condensing lens CL can be an independent element, which is provided separately from the light guide plate 100 (as shown in FIG. 6 ), or the condensing lens CL and the light guide plate 100 can be an integrated optical element (as shown in FIG. 6 ). 5). In this way, through the arrangement of the condenser lens CL, the light-emitting angle of the light beam provided by the light-emitting element LE can be converged, and the local dimming capability of the light source devices 200A and 200B can be further improved. With the configuration of the first microstructure 110 and the second microstructure 120 , the light source devices 200A and 200B can also achieve local dimming capability and maintain the image quality of the lighting pattern, and achieve similar effects and advantages as the aforementioned light source device 200 . I won't go into details.

To sum up, the embodiments of the present invention have at least one of the following advantages or effects. In the embodiment of the present invention, since the first microstructure close to the light incident side is a crescent-shaped microstructure, it can reflect light in a wide angle range, so the hot spot phenomenon can be effectively eliminated. On the other hand, in this embodiment, the second microstructure away from the light incident side is a crescent-shaped microstructure with a small curvature or a rod-shaped microstructure with a curvature equal to zero, so that the incident light that can be reflected is limited to only For incident light from near the vertical direction. In this way, the second microstructures located on the responsible lighting area of each light-emitting element will not reflect the light beams from the adjacent responsible lighting area, which helps to improve the local dimming capability of the light source device. In this way, through the configuration of the first microstructure and the second microstructure, the light guide plate and the light source device can realize the local dimming capability and maintain the image quality of the lighting pattern.

Only the above are only preferred embodiments of the present invention, and should not limit the scope of the present invention, that is, any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the contents of the description of the invention, All still fall within the scope of the patent of the present invention. In addition, it is not necessary for any embodiment of the present invention or the claimed scope of the present invention to achieve all of the objects or advantages or features disclosed in the present invention. In addition, the abstract section and headings are only used to aid the search of patent documents and are not intended to limit the scope of the present invention. In addition, terms such as "first" and "second" mentioned in this specification or the scope of the patent application are only used to name the elements or to distinguish different embodiments or scopes. It is not intended to limit the upper or lower limit of the number of components.

100: light guide plate

110: First Microstructure

120: Second Microstructure

200: Light source device

210: The first light source

D1: first direction

D2: Second direction

E: extension cord

LE: light-emitting element

M: midline

O: Optical axis direction

OS1: The first optical surface

OS2: Second Optical Surface

OS3: Third Optical Surface

OS4: Fourth Optical Surface

R110: The first area

R120: Second area

RIL: Responsible Lighting Area

S1: first surface

SI1: The first light incident surface

SS1: first side

Claims (24)

A light guide plate is suitable for guiding a plurality of light beams, the plurality of light beams are respectively provided by a plurality of light emitting elements, and the plurality of light emitting elements are arranged along a first direction, wherein: the light guide plate has a light incident surface and a first a surface, the first surface is connected to the light incident surface, and the light guide plate has a first area and a second area on the first surface, the first area is compared with the second area closer to the light incident surface; in the first area, a plurality of first microstructures are arranged, each of the first microstructures faces the tangential direction of the central portion of the light incident surface and the first direction parallel, wherein each of the first microstructures has a first curvature, and the first microstructures are crescent-shaped microstructures with a first ridge line, and the first curvature is the curvature of the first ridge line; And in the second region, a plurality of second microstructures are provided, wherein each of the second microstructures has a second curvature, and the maximum value of the plurality of first curvatures is greater than the plurality of second curvatures the maximum value of . The light guide plate according to claim 1, wherein each of the first microstructures has a first optical surface and a third optical surface, the first optical surface faces the light incident surface, and the third optical surface Facing away from the light incident surface, the first optical surface and the third optical surface of each of the first microstructures are connected to each other to form the first ridge line. The light guide plate according to claim 1, wherein the plurality of first curvatures of the plurality of first microstructures gradually decrease from a side close to the light incident surface to a side away from the light incident surface. The light guide plate according to claim 3, wherein each of the second microstructures is a crescent-shaped microstructure and has a second optical surface and a fourth optical surface, and the second optical surface faces the inlet. light surface, the fourth optical surface faces away from the light incident surface, the second optical surface and the fourth optical surface of each of the second microstructures are connected to each other to form a second ridge line, the second optical surface The curvature is the curvature of the second ridge line, and the plurality of second curvatures of the plurality of second microstructures gradually decrease from the side close to the light incident surface to the side away from the light incident surface. The light guide plate according to claim 1, wherein the first curvature is a fixed value. The light guide plate of claim 1, wherein the first microstructure and the second microstructure are recessed into the first surface. A light guide plate, suitable for guiding a plurality of light beams, wherein: the light guide plate has a light incident surface and a first surface, the first surface is connected with the light incident surface, and the light guide plate is in the first The surface has a first area and a second area, the first area is closer to the light incident surface than the second area; in the first area, a plurality of first microstructures are arranged, wherein Each of the first microstructures has a first curvature, the first curvature is a fixed value, and the first microstructure is a crescent-shaped microstructure with a first ridge line, and the first curvature is the first curvature. the curvature of a ridge; and In the second region, a plurality of second microstructures are provided, wherein each of the second microstructures has a second curvature, and the maximum value of the plurality of first curvatures is greater than the maximum value of the plurality of second curvatures maximum value; the light guide plate further has a first side surface, the first side surface is opposite to the light incident surface, the first surface connects the light incident surface and the first side surface, and the light guide plate is in the The first surface has a center line, and the distance between the light incident surface and the center line is equal to the distance between the first side surface and the center line. The surface forms the first area between the light incident surface and the center line, and the first surface of the light guide plate forms the second area between the first side surface and the center line , and wherein each of the second microstructures is a rod-shaped microstructure, the second curvature is zero, and a plurality of the second microstructures are also arranged in the first area, and in the first area The number ratio of the second microstructures in the first region is smaller than the number ratio of the first microstructures in the first region, and a plurality of the first microstructures are also arranged in the second region, and in the The number ratio of the second microstructures in the second region is greater than the number ratio of the first microstructures in the second region. A light guide plate, suitable for guiding a plurality of light beams, wherein: the light guide plate has a light incident surface and a first surface, the first surface is connected with the light incident surface, and the light guide plate is in the first The surface has a first area and a second area, the first area is closer to the light incident surface than the second area; in the first area, a plurality of first microstructures are arranged, wherein Each of the first microstructures has a first curvature, the first curvature is a fixed value, and the first microstructure is a crescent-shaped microstructure with a first ridge line, and the first curvature is the first curvature. one the curvature of the ridge line; and in the second region, a plurality of second microstructures are provided, wherein each of the second microstructures has a second curvature, and the maximum value of the plurality of first curvatures is greater than the The maximum value of a plurality of second curvatures; the plurality of light beams enter the light guide plate from the light incident surface and extend along the light emitting angle to form a plurality of illumination areas on the first surface respectively, and each of the illumination The area includes a first sub-illumination area and a second sub-illumination area, the first sub-illumination area is an area where each of the illumination areas does not overlap with other illumination areas, and the second sub-illumination area is adjacent to all the illumination areas. The illumination areas overlap each other, and the first sub-illumination area is the first area, and the second sub-illumination area is the second area. The light guide plate according to claim 8, wherein each of the second microstructures is a rod-shaped microstructure, the second curvature is zero, and a plurality of all the second microstructures are further arranged in the first sub-illumination area. the second microstructure. The light guide plate according to claim 8, wherein a plurality of the first microstructures are further arranged in the second sub-illumination area, and the second sub-illumination area in the second sub-illumination area is further provided with a plurality of the first microstructures The number ratio of microstructures is greater than the number ratio of the first microstructures in the second sub-illumination area. The light guide plate according to claim 8, wherein the first microstructures are arranged only in the first sub-illumination area. A light source device comprising: a light source including a plurality of light emitting elements adapted to provide a plurality of light beams, the plurality of light emitting elements being arranged along a first direction; and A light guide plate, suitable for guiding the light beam, wherein: the light guide plate has a light incident surface and a first surface, the first surface is connected with the light incident surface, and the light guide plate is on the first surface There are a first area and a second area, the first area is closer to the light incident surface than the second area; in the first area, there are a plurality of first microstructures, each of which is The tangential direction of the first microstructure facing the central portion of the light incident surface is parallel to the first direction, wherein each of the first microstructures has a first curvature, and the first microstructures are crescent-shaped microstructures. a structure having a first ridge line, the first curvature being the curvature of the first ridge line; and in the second region, a plurality of second microstructures are disposed, wherein each of the second microstructures has a second curvature, and the maximum value of the plurality of first curvatures is greater than the maximum value of the plurality of second curvatures, and the light beam exits the first microstructure and the second microstructure A preset pattern is displayed behind the light guide plate. The light source device according to claim 12, wherein the light beam has an optical axis direction extending from a midpoint between adjacent light emitting elements in a direction parallel to the optical axis direction The extension line divides the responsible lighting area of each of the light-emitting elements. The light source device of claim 12, wherein each of the first microstructures has a first optical surface and a third optical surface, the first optical surface faces the light incident surface, and the third optical surface face away from the light incident surface, each of the first The first optical surface and the third optical surface of the microstructure are connected to each other to form the first ridge line. The light source device of claim 12, wherein the plurality of first curvatures of the plurality of first microstructures gradually decrease from a side close to the light incident surface to a side away from the light incident surface. The light source device of claim 15, wherein each of the second microstructures is a crescent-shaped microstructure and has a second optical surface and a fourth optical surface, and the second optical surface faces the inlet. light surface, the fourth optical surface faces away from the light incident surface, the second optical surface and the fourth optical surface of each of the second microstructures are connected to each other to form a second ridge line, the second optical surface The curvature is the curvature of the second ridge line, and the plurality of second curvatures of the plurality of second microstructures gradually decrease from the side close to the light incident surface to the side away from the light incident surface. The light source device of claim 12, wherein the first curvature is a fixed value. The light source device of claim 12, wherein the first microstructure and the second microstructure are recessed into the first surface. The light source device according to claim 12, further comprising a plurality of condensing lenses provided respectively corresponding to the plurality of light emitting elements. A light source device, comprising: a light source, suitable for providing a plurality of light beams; and a light guide plate, suitable for guiding the light beams, wherein: the light guide plate has a light incident surface and a first surface, the first surface and the light incident surfaces are connected, and the light guide plate has a first area and a second area on the first surface, the first area is closer to the light incident surface than the second area; In the first area, a plurality of first microstructures are arranged, wherein each of the first microstructures has a first curvature, the first curvature is a fixed value, and the first microstructures are crescent-shaped microstructures. a structure having a first ridge line, the first curvature being the curvature of the first ridge line; and in the second region, a plurality of second microstructures are disposed, wherein each of the second microstructures has a second curvature, and the maximum value of the plurality of first curvatures is greater than the maximum value of the plurality of second curvatures, and the light beam exits the first microstructure and the second microstructure The light guide plate presents a preset pattern after the light guide plate, the light guide plate further has a first side surface, the first side surface is opposite to the light incident surface, and the first surface connects the light incident surface and the first side surface, And the light guide plate has a center line on the first surface, the distance between the light incident surface and the center line is equal to the distance between the first side surface and the center line, the guide The first surface of the light guide plate forms the first area between the light incident surface and the center line, and the first surface of the light guide plate is between the first side surface and the center line forming the second region, wherein each of the second microstructures is a rod-shaped microstructure, the second curvature is zero, and a plurality of the second microstructures are also arranged in the first region, and The number ratio of the second microstructures in the first region is smaller than the number ratio of the first microstructures in the first region, and a plurality of the first microstructures are also arranged in the second region. a microstructure, and the second microstructure in the second region The number ratio is greater than the number ratio of the first microstructures in the second region. A light source device, comprising: a light source, suitable for providing a plurality of light beams; and a light guide plate, suitable for guiding the light beams, wherein: the light guide plate has a light incident surface and a first surface, the first surface and the The light incident surfaces are connected, and the light guide plate has a first area and a second area on the first surface, the first area is closer to the light incident surface than the second area; In the first region, a plurality of first microstructures are arranged, wherein each of the first microstructures has a first curvature, the first curvature is a fixed value, and the first microstructures are crescent-shaped microstructures, having a first ridge line, the first curvature being the curvature of the first ridge line; and in the second region, a plurality of second microstructures are provided, wherein each of the second microstructures has a second curvature, and the maximum value of the plurality of first curvatures is greater than the maximum value of the plurality of second curvatures, and the light beam leaves the light guide plate through the first microstructure and the second microstructure After a preset pattern is displayed, the plurality of light beams enter the light guide plate from the light incident surface and then extend along the light emitting angle to form a plurality of illumination areas on the first surface respectively, and each of the illumination areas includes A first sub-illumination area and a second sub-illumination area, the first sub-illumination area is an area where each of the illumination areas does not overlap with other illumination areas, and the second sub-illumination area is the adjacent illumination area The regions overlap each other, and the first sub-illumination region is the first region, and the second sub-illumination region is the second region. The light source device according to claim 21, wherein each of the second microstructures is a rod-shaped microstructure, the second curvature is zero, and a plurality of all the second microstructures are further arranged in the first sub-illumination area. the second microstructure. The light source device according to claim 21, wherein a plurality of the first microstructures are further provided in the second sub-illumination area, and the second sub-illumination area in the second sub-illumination area The number ratio of microstructures is greater than the number ratio of the first microstructures in the second sub-illumination area. The light source device according to claim 21, wherein the first microstructures are arranged only in the first sub-illumination area.

Images