JP2022188752A - Light source device - Google Patents

Abstract

To provide a light source device including a light source and a light guide plate.SOLUTION: A light source provides multiple luminous fluxes. A light guide plate guides the multiple luminous fluxes and includes multiple microstructures. The light guide plate has a light incidence surface and a first surface. The light incidence surface is connected to the first surface. The light source is installed in one side of the light incidence surface. Multiple microstructures are installed on the first surface. Respective microstructures of the multiple microstructures have a light reception surface directed toward the light source. The respective microstructures of the multiple microstructures satisfy a condition of θ'=arctan((▵x-sin(arctan(x/▵y))*a)/▵y). A light source device can generate a relatively accurate pattern.SELECTED DRAWING: Figure 1

Description

The present invention relates to an optical device, and more particularly to a light source device.

The current luminous light panel products still use acrylic materials, and use injection or pressing methods to form microstructures on the back of the acrylic plate. Then, using a light source placed on one side of the acrylic plate, light is transmitted into the acrylic plate, is totally reflected when it hits the microstructure, and emerges from the front (viewing surface). Using the principle of this light guide plate, microstructures are arranged in a pattern so that the light panel becomes transparent when not lit and creates a floating screen when lit. By further devising based on the light receiving angle of the microstructure and the direction and distance facing the light source, it is possible to realize special effects such as a sense of perspective, glitter, and moving images.

To achieve a dynamic effect with a light panel, the light receiving surface of the microstructures is aligned face-on with the light source, and different light sources are associated with each set of microstructures to produce different patterns. However, it has been found that microstructures that are not in direct view of the viewer in use can still reflect light from non-compliant light sources back to the viewer by design, causing the viewer to see erroneous or distorted patterns.

The present invention provides a light source device that allows viewers to see relatively accurate patterns.

One embodiment of the present invention provides a light source device including a light source and a light guide plate. A light source provides a plurality of luminous fluxes. The light guide plate guides multiple light beams and includes multiple microstructures. The light guide plate has a light entrance surface and a first surface. A light input surface is connected to the first surface. A light source is installed on one side of the light incident surface. A plurality of microstructures are disposed on the first surface. Each microstructure has a light receiving surface facing the light source. Each microstructure satisfies the condition θ′=arctan((Δx−sin(arctan(x/Δy))*a)/Δy), and θ′ is the extension of the normal vector of the light receiving surface and the first Δx is the distance along the second direction between the light-receiving surface and the projected point on the incident surface of the light source, and Δy is the distance along the first direction between the light-receiving surface and the projected point , where x is the distance between the light-receiving surface and the viewer along the second direction, a is the correction coefficient, the first direction is the direction perpendicular to the light-receiving surface, and the second direction is the first surface. A direction that is parallel and perpendicular to the first direction.

As described above, in one embodiment of the present invention, when the microstructure of the light source device satisfies the condition θ′=arctan((Δx-sin(arctan(x/Δy))*a)/Δy), the light source device can generate relatively accurate patterns.

3 is a schematic three-dimensional view of a light source device according to one embodiment of the present invention; FIG. FIG. 3 is a schematic view of a light source device having a microstructure on the first surface thereof according to an embodiment of the present invention; FIG. 2B is a front view of FIG. 2A; FIG. 2B is a schematic cross-sectional view of the microstructure of FIG. 2B along vertical line L';

FIG. 1 is a three-dimensional schematic diagram of a light source device according to one embodiment of the present invention. Referring to FIG. 1 , a light source device 10 according to an embodiment of the present invention includes light source modules 210 and 220 and a light guide plate 100 . The light source modules 210 and 220 are installed on one side of the light incident surfaces SI1 and SI2 of the light guide plate 100, respectively. Two light source modules 210, 220 are shown in FIG. However, the present invention is not limited to this, and the number of light source modules of the light source device 10 is determined according to design needs.

Specifically, in the present embodiment, the light source modules 210 and 220 include a light bar with multiple light sources LE, the light sources LE providing multiple luminous fluxes, and the light sources LE include, for example, light emitting diode (LED) elements or other types of light emitting diodes. may be a light emitting element.

FIG. 2A is a schematic view of a light source device according to an embodiment of the present invention, in which microstructures are installed on the first surface, and the second surface S2 is not shown in FIG. 2A. FIG. 2B is a front view of FIG. 2A. FIG. 2C is a schematic cross-sectional view of the microstructure of FIG. 2B along vertical line L'. 1, 2A-2C, in this embodiment, the light guide plate 100 guides the light flux, and the light guide plate 100 has a plurality of microstructures 102 displaying patterns. The light guide plate 100 has light incident surfaces SI1 and SI2, a first surface S1 and a second surface S2. The light incident surfaces SI1, SI2 are connected to the first surface S1 and the second surface S2. A plurality of microstructures 102 are located on the first surface S1. Also, the luminous flux B emitted by the light source LE is reflected by the microstructure 102 and is emitted from the second surface S2 of the light guide plate 100, which is received by the viewer EY.

In this implementation, each different light source LE corresponds to a set of microstructures. Taking the light source LE1 and its corresponding single microstructure 102 of FIGS. 2A and 2B as an example, the microstructure 102 has a light receiving surface 102S directed toward the light source LE1. Although the light receiving surface 102S of the microstructure 102 faces the light source LE1, it is preferable to design the light receiving surface 102S to face the virtual light source LE1' from the front. Specifically, each microstructure 102 satisfies the condition θ′=arctan((Δx-sin(arctan(x/Δy))*a)/Δy), where θ′ is the normal vector of the light receiving surface 102S. Δx is the included angle between the extension line L′ and the first direction D1, Δx is the distance along the second direction D2 between the light receiving surface 102S and the light source LE1 projected on the light incident surface SI2, and Δy is the distance along the second direction D2. 102S and the projection point P1 are the distance along the first direction D1, x is the distance between the light receiving surface 102S and the viewer EY along the second direction D2, a is the correction coefficient, and the first direction D1 is It is a direction perpendicular to the light incident surface SI2, and the second direction D2 is a direction parallel to the first surface S1 and perpendicular to the first direction D1.

In addition, although FIG. 2B shows the difference between the included angles θ and θ′, the included angle θ is the normal vector is an included angle between the extension line L of and the first direction D1.

In this implementation, the correction factor a is a function of multiple variables. The multiple variables include the shape of the microstructure 102, the distance between the light guide plate 100 and the viewer EY along the third direction D3, and the refractive index of the light guide plate 100, where the third direction D3 is the first direction D1 and the second direction Perpendicular to D2, the shape of the microstructure 102 includes all factors that can affect the exit angle after the microstructure 102 reflects the light flux, including, for example, the acceptance angle α in FIG. 2C.

In this embodiment, the light source device 10 further satisfies the condition s=−sin(arctan(x/Δy))*a, where Δx′=Δx+s, where Δx′ is between the light receiving surface 102S and the light incident surface SI2. The virtual position P1' is the distance along the second direction D2, and the virtual position P1' is the intersection of the extension line L' of the normal vector of the light receiving surface 102S and the extended surface of the light incident surface SI2, s is the distance between the projection point P1 and the virtual position P1' along the second direction D2.

In this implementation, the microstructures 102 may be prismatic structures. Moreover, as shown in FIG. 2C, there is a light receiving angle α between the light receiving surface 102S of the microstructure 102 and the first surface S1, and the light receiving angle α is greater than 0 and less than 90 degrees.

前記の表１ないし表４は本発明の実施例に基づく光源装置１０中の微構造１０２が導光板１００の第１表面Ｓ１上に設置される各位置の夾角θ’の好ましい設計値を示している。表１ないし表４の各関連パラメータは以下の通りである。導光板１００の屈折率は１．４９であり、微構造１０２の受光角αは５２度であり、導光板１００と観賞者ＥＹが第３方向Ｄ３に沿った距離は５００ミリメートルであり、補正係数ａは４６．６７であり、光源ＬＥ１と観賞者ＥＹが第２方向Ｄ２に沿った距離は７０ミリメートルであり、及び、第２方向において観賞者ＥＹが光源ＬＥ１の第２方向Ｄ２の正方向の位置にある。表１ないし表４において、横軸は微構造１０２と観賞者ＥＹが第２方向Ｄ２に沿った距離であり（即ち、図２Ａの距離ｘ）、横軸の単位はミリメートル（ｍｉｌｌｉｍｅｔｅｒ）であり、かつ、マイナス値は微構造１０２が観賞者ＥＹの第２方向Ｄ２の反対側に位置することを意味する。縦軸はΔｙであり、かつ、マイナス値は微構造１０２が入光面ＳＩ２よりも第１方向Ｄ１寄りの位置にあることを意味する。

Tables 1 to 4 above show preferred design values of the included angle θ' at each position where the microstructure 102 in the light source device 10 according to the embodiment of the present invention is placed on the first surface S1 of the light guide plate 100. there is Each relevant parameter in Tables 1 to 4 is as follows. The refractive index of the light guide plate 100 is 1.49, the light receiving angle α of the microstructure 102 is 52 degrees, the distance between the light guide plate 100 and the viewer EY along the third direction D3 is 500 mm, and the correction coefficient a is 46.67, the distance between the light source LE1 and the viewer EY along the second direction D2 is 70 millimeters, and in the second direction the viewer EY is in the positive direction of the second direction D2 of the light source LE1. in position. In Tables 1 to 4, the horizontal axis is the distance between the microstructure 102 and the viewer EY along the second direction D2 (i.e., the distance x in FIG. 2A), the unit of the horizontal axis is millimeters, Also, a negative value means that the microstructure 102 is located on the opposite side of the viewer EY in the second direction D2. The vertical axis is Δy, and a negative value means that the microstructure 102 is positioned closer to the first direction D1 than the light incident surface SI2.

In summary, in one embodiment of the present invention, a plurality of microstructures are placed on the first surface of the light guide plate of the light source device. If the microstructure satisfies the condition θ′=arctan((Δx−sin(arctan(x/Δy))*a)/Δy), the emission viewing angles of the microstructures at different positions are corrected, so that the light source device emits The viewing effective range of the pattern is expanded. Also, if different light sources are turned on in different time sequences, the interference problem between the patterns provided by these different light sources can be addressed, further improving the dynamic effect of the light source device. In addition, different light sources can be designed to provide different colored luminous fluxes to achieve the full color effect of the light source device.

10 Light source device 100 Light guide plate 102 Microstructure 102S Light receiving surface 210, 220 Light source module B Luminous flux D1 First direction D2 Second direction D3 Third direction EY Viewers L, L' Extension line LE1 Light source LE1' Virtual light source P1 Projection point P1 ' virtual position s, Δx, Δx', Δy distance S1 first surface S2 second surfaces SI1, SI2 light incident surface x distance α light receiving angle θ, θ' included angle

Claims (5)

A light source device,
the light source device includes a light source and a light guide plate;
the light source provides a plurality of luminous fluxes;
the light guide plate guides the plurality of light beams and has a plurality of microstructures;
the light guide plate has a light incident surface and a first surface, the light incident surface is connected to the first surface;
The light source is installed on one side of the light incident surface,
said plurality of microstructures disposed on said first surface, each microstructure in said plurality of microstructures having a light receiving surface directed toward said light source;
Each microstructure in the plurality of microstructures satisfies the following conditions,
θ′=arctan((Δx−sin(arctan(x/Δy))*a)/Δy),
θ′ is the included angle between the extension of the normal vector of the light receiving surface and the first direction, and Δx is the distance along the second direction between the light receiving surface and the projection point of the light source on the light incident surface. where Δy is the distance between the light receiving surface and the projection point along the first direction, x is the distance between the light receiving surface and the viewer along the second direction, and a is a correction coefficient. wherein the first direction is a direction perpendicular to the light incident surface, and the second direction is a direction parallel to the first surface and perpendicular to the first direction. . 2. The light source device of claim 1, wherein said plurality of microstructures are prismatic microstructures. having an acceptance angle between the light-receiving surface and the first surface;
2. The light source device according to claim 1, wherein said light receiving angle is greater than 0 degrees and less than 90 degrees. The correction factor a is a function of multiple variables,
the plurality of variables include shapes of the plurality of microstructures, a distance between the light guide plate and the viewer along a third direction, and a refractive index of the light guide plate;
The light source device of claim 1, wherein the third direction is perpendicular to the first direction and the second direction. The light source device further
satisfies the condition of s = -sin (arctan (x / Δy)) * a,
Δx′=Δx+s, where Δx′ is the distance along the second direction between the virtual positions of the light receiving surface and the light incident surface, and s is the distance between the projected point on the light incident surface and the The virtual position is the distance along the second direction, and the virtual position is the intersection of the extension line of the normal vector of the light receiving surface and the extended surface of the light incident surface, The light source device according to claim 1.

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