JP2019114325A - Solid light source device and electronic device utilizing the same - Google Patents

Abstract

To provide a solid light source device capable of resolving restrictions such as thermal and wiring resistances, and excellent in uniformity of light distribution without generating a dark line in imaging of an LED.SOLUTION: A solid light source with a solid light-emitting element, comprises: a substrate one surface of which at least single or plural solid light-emitting elements are installed; and an action mechanism configured to provide, to the substrate, action in which in a predetermined region parallel with the surface of the substrate, within a predetermined time in time resolution of a human eye, motion that a position of the solid light-emitting element on the substrate moves to a different position on the surface and then returns to the original position is repeated.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a solid-state light source device using a solid-state light source such as an LED, and more particularly to a solid-state light source device suitable as a headlight of an automobile, and further as a light source for signage and light sources.

  Conventionally, as a light source of a headlight of an automobile, generally, for example, according to the following Patent Document 1, a plurality of solid light emitting elements such as LEDs are arrayed in a high density in the form of a matrix in a mutually close state Electronically controlled lamps have been known to obtain desired light distribution characteristics by obtaining desired brightness (for example, 3 rows by 8 columns) and arranging optical elements such as lenses on the front of these LEDs. There is.

Japanese Patent Publication No. 2003-503815

  According to the above-described prior art lamp, there is a limit to the size of the LED as the light source, and there is a thermal restriction and a restriction of the wiring resistance, so a gap is provided between the plurality of LEDs. There is a need. However, this gap also leads to the formation of dark lines during the imaging of the individual LEDs, and the overall light distribution obtained may have non-uniformity when the spacing between the LEDs is large.

  In addition, when achieving high resolution, the number of the LEDs increases in a two-dimensional manner, which causes an increase in the cost of the entire apparatus as well as the light source.

  The present invention uses a solid-state light source device that is free from the occurrence of dark lines during image formation of LEDs while eliminating constraints such as thermal resistance and wiring resistance, and is also excellent in uniformity of light distribution. It aims at providing an electronic device.

  In order to achieve the above object, according to the present invention, first, a solid-state light source device provided with a solid-state light-emitting element, wherein at least one or more solid-state light-emitting elements are mounted on one surface; Within a given area of a plane parallel to the surface, within a given time within the time resolution of the human eye, the position of the solid state light emitting element on the substrate is moved to a different position in the plane after being moved to the original position. There is provided a solid state light source device comprising a motion mechanism for applying a motion to repeat the motion back to the substrate with respect to the substrate. The solid-state light source device of the present invention can be widely used, for example, as a headlamp of a vehicle, an image projection device for a vehicle, a head-up display, a light source of a projector, and the like.

  According to the present invention, there is provided a solid-state light source device excellent in uniformity of light distribution while eliminating constraints such as thermal resistance and wiring resistance in the prior art, and without occurrence of dark lines during image formation of LEDs. Exerts an excellent effect of making it possible to provide an electronic device using it.

It is a figure explaining the principle of the solid-state light source device concerning one embodiment of the present invention. It is a figure explaining arrangement | positioning of the light emitting element of the solid-state light source device for headlights which concerns on one embodiment of this invention. It is a figure explaining an example of composition of a linear motion mechanism of a solid-state light source device concerning a 1 embodiment of the present invention. It is a figure explaining an example of operation | movement of the linear motion mechanism of the solid-state light source device which concerns on one embodiment of this invention. It is a figure which shows the cross-section in the case of incorporating the solid-state light source device which concerns on one embodiment of this invention as a headlamp for vehicles. It is a figure which shows the state which integrated the solid-state light source device which concerns on one embodiment of this invention as a headlamp for vehicles. It is a figure which shows the other sequence configuration of the light emitting element of the solid-state light source device based on one embodiment of this invention. It is a figure which shows the further another array configuration of the light emitting element of the solid-state light source device based on one embodiment of this invention. It is a figure which shows the further another modification of the light emitting element of the solid-state light source device which concerns on one embodiment of this invention. It is a figure which shows operation | movement of the modification of the said FIG. It is a figure which shows the other example of a structure of the linear motion mechanism of the solid-state light source device which concerns on one embodiment of this invention. It is a figure which shows the further another example of a structure of the linear motion mechanism of the solid-state light source device based on one embodiment of this invention. It is a figure which shows the example which applied the solid-state light source device which concerns on one embodiment of this invention to a head-up display apparatus (HUD). It is a figure which shows the example which applied the solid-state light source device which concerns on one embodiment of this invention to a projector.

  Hereinafter, a solid-state light source device according to an embodiment of the present invention and an electronic device using the same will be described in detail with reference to the attached drawings, but before that, according to an embodiment of the present invention The principle of the solid state light source device will be described.

<Principle of solid light source device of the present invention>
First, FIG. 1 shows the principle of a solid-state light source device according to an embodiment of the present invention, and as is apparent from this figure, for example, a light emitting element 11 having a rectangular outer shape or a plurality of outer shapes (see FIG. In this example, a case is considered in which four elements are arranged and light is emitted from these elements, and the element is moved within a predetermined area on a plane parallel to the light emission plane. That is, from the state shown in FIG. 1 (A) (at t1), as shown by the arrow in FIG. 1 (B), it moves downward (at t2) and further as shown by the arrow in FIG. , Move downward (at time t3), and then, as shown in FIG. 1 (D), return to the state shown in FIG. 1 (A) (at time t4 = t1). According to the fact that such movement is repeated for one or more light emitting elements 11 at a time resolution of about 50 ms to 100 ms or less, which is the time resolution of human eyes, in the above example, the human eye It will be perceived that 3 = 12 elements are lit at the same time.

  That is, by causing the light emitting elements 11 that are LEDs to move (oscillate) by the movement mechanism including the linear motion as described above, the number of light emitting elements 11, that is, the number of pixels is artificially increased. be able to. So, in this invention, a solid-state light source device is comprised based on said principle.

<Example of arrangement of light emitting elements>
FIG. 2 shows the light emitting element substrate 10 of the solid-state light source device according to one embodiment of the present invention, and shows an example of the arrangement of the light emitting elements 11 on the light emitting element substrate 10.

  In FIG. 2, on the rectangular light emitting element substrate 10, the light emitting elements 11 composed of a plurality of (in this example, 4 × 3 = 12) LEDs having a square outer shape are adjacent to each other, however, Are arranged in the longitudinal direction and the lateral direction (at the same pitch (d) as the size of the LED) (time at t1: see FIG. 2A). These light emitting elements 11 are moved in the lateral (right) direction (time t2: FIG. 2B) with a period of about 50 ms to 100 ms or less, which is the time resolution of human eyes, by the linear motion mechanism described below. (Refer to), vertical (down) direction (t3: refer to FIG. 2 (C)), and horizontal (left) direction (t4: refer to FIG. 2 (D)), linear motion (rocking) ) Is repeated.

  That is, according to the above-described linear movement (rocking) of the light emitting element 11 which is an LED, the number of light emitting elements, that is, the number of pixels is artificially 4 × 3 = 12 to 8 × 6 = 48. It is possible to increase it to

  Further, as is apparent from the above, 4 × 3 = 12 light emitting elements 11 may be disposed on the light emitting element substrate 10 at the same width (d) without mutually adhering. Since it is possible, it becomes possible to solve the problems such as the thermal problems and the wiring resistance which are problems in the prior art. In particular, when the solid-state light source device is used as a headlight of an automobile, which will also be described later, a light source with high light output is required, but even in such a case, light emitting elements with high light output are separated without being in contact with each other. The heat dissipation can be sufficiently ensured by arranging them in a similar manner. In addition, by moving the LEDs, it is possible to emit light even in the gaps between the LEDs that are light emitting elements, to improve the nonuniformity of the light distribution, and to configure the light source with a small number of LED pixels, thereby reducing the cost of the device. Down and circuit simplification are possible.

<Linear motion mechanism>
Subsequently, an example of a so-called linear motion mechanism 20, which is a mechanism for giving the linear motion to the light emitting element substrate 10 described above to bring about the linear motion (oscillation) to the light emitting element 11, is shown in FIGS. Shown in.

  FIG. 3 is a perspective view of the above-described light emitting element substrate 10 as viewed from the back side, and as is apparent from the figure, a square frame 21 is formed substantially at the center of the back surface of the light emitting element substrate 10. Inside the frame 21, a substantially triangular cam 22 is rotatably inserted and disposed. The cam 22 is rotationally driven by, for example, the rotation shaft 24 of the motor 23. According to the linear motion mechanism 20 having such a structure, as is apparent from FIGS. 4A to 4D, the rotational motion of the motor 23 is described above through the cam mechanism including the frame 21 and the cam 22. It is possible to convert it into square motion (square trajectory), thereby realizing the motion of the light emitting element (LED) 11 as described above (see d in the figure (= distance between elements)).

  Subsequently, FIGS. 5A and 5B show cross-sectional views in the case where the solid-state light source device 100 according to one embodiment of the present invention is incorporated as a headlamp for a vehicle. In the example of Fig. 5B, the light from the solid state light source device 100 passes through the projection lens 30, and in the example of Fig. 5B, the light from the solid state light source device 100 is temporarily reflected on a curved (for example, paraboloidal) reflector The light is projected to the front of the vehicle through 40. The solid-state light source device 100 is connected to a control device 50 for controlling a linear motion mechanism 20 which brings about linear motion (oscillation) to the light emitting element 11 together with the light emitting element 11 thereof.

  Furthermore, an example in which the above-described headlamp is applied to two headlights 201 of a car 200 is shown in FIG. In this example, every two light emitting elements 11, which are two LED pixels in the horizontal direction and four (2 × 4 = 8) LED pixels in the vertical direction, on the light emitting element substrate 10 as described above. The light emitting element substrate 10 was arranged side by side, and linear motion (oscillation) was generated by the linear motion mechanism 20 described above. As a result, from the left and right headlights 201, the number of pixels of 4 horizontal × 8 vertical = 32 is virtually obtained, and there is no dark line between adjacent pixels, as a whole. Good illumination light having uniform light distribution characteristics was obtained.

<Other examples of arrangement of light emitting elements and movement mechanism>
In the above example, in particular, as the light source of high light output used as a headlight of a car, as shown also in FIG. 2, an example is shown in which the light emitting elements 11 are arranged horizontally and vertically. The invention is not limited thereto, and the same effects as described above can be obtained by arranging the light emitting elements as described below.

  First, as already shown in FIGS. 1A to 1D, the light emitting elements 11 are discretely arranged only in the lateral direction, and these light emitting elements 11 are arranged in the vertical direction (that is, the arrangement of the light emitting elements Move in a direction perpendicular to the direction). Also by this, output light similar to the case where 4 × 3 = 12 light emitting elements are arranged in the vertical and horizontal directions can be obtained by the four light emitting elements.

  Further, in the example of the arrangement of the light emitting elements shown in FIGS. 7A to 7D, the light emitting elements 11 are disposed in close contact with each other only in the lateral direction, and these light emitting elements 11 are longitudinally It moves sequentially in the direction orthogonal to the arrangement direction of the elements). Also in this case, in this example, the same output light as in the case where 8 × 3 = 24 light emitting elements are arranged in the vertical and horizontal directions can be obtained by eight light emitting elements.

  Furthermore, in the example of the arrangement of the light emitting elements shown in FIGS. 8A to 8D, the light emitting elements 11 are arranged in a so-called staggered manner while being separated from each other vertically in the lateral direction. Are sequentially moved in the longitudinal direction (that is, the direction orthogonal to the arrangement direction of the light emitting elements). Also in this case, the same output light as in the case where 8 × 3 = 24 light emitting elements are arranged in the vertical and horizontal directions can be obtained by the eight light emitting elements as described above.

  In addition, in the example of the arrangement of the light emitting elements shown in FIG. 9, a plurality of (six in this example) light emitting elements 11 are arranged on the light emitting element substrate 10, and the light emitting element substrate 10 is shown in FIG. While moving in a direction orthogonal to the arrangement direction of the light emitting elements 11, a so-called cylindrical lens 80 is disposed in front of the light emitting surface of the light emitting elements 11. According to the solid-state light source device 100 having such an arrangement of light emitting elements, as is apparent from FIGS. 10A to 10D, along with the movement of the light emitting elements 11 in the longitudinal direction, By the function of the cylindrical lens 80, it is possible to secure the area of the LED light emitting point while reducing the vertical oscillation due to the linear motion mechanism of the LED. In other words, by arranging the cylindrical lens 80 having a curvature with respect to the moving direction of the LED, it is possible to expand and project the LED light emitting surface beyond the actual moving distance.

  Subsequently, another example of the linear motion mechanism 20, which is a mechanism for giving the linear motion to the light emitting element substrate 10 described above to bring about the linear motion (rocking) to the light emitting element 11, will be described with reference to FIGS. Shown in.

  The linear motion mechanism 20 'shown in FIG. 11 employs a laminated piezoelectric element 25 that expands and contracts by an applied voltage, instead of the cam mechanism shown in FIG. 3 and FIG. More specifically, the piezoelectric elements 25 are attached to two adjacent sides of the light emitting element substrate 10 having the light emitting elements 11 arranged on the surface thereof in a rectangular frame 27, and the remaining two sides are so-called The coil spring 26 is attached. In such a configuration, it is possible to apply the same linear motion (oscillation) as described above to the light emitting element substrate 10 by sequentially applying a voltage to the piezoelectric element 25.

  Further, in the linear motion mechanism 20 ′ ′ shown in FIG. 12, a desired linear motion (oscillation) is obtained by utilizing the electromagnetic coil 28 in place of the cam mechanism and the piezoelectric element described above. Also in the example, the same linear motion (oscillation) as described above can be given by sequentially passing a current to the electromagnetic coil 28 by the X-axis drive circuit 29 and the Y-axis drive circuit 29 'in the figure.

  Each of the linear motion mechanisms 20 ′ and 20 ′ ′ shown above has a structure that allows the light emitting element substrate 10 to be moved in the parallel and perpendicular directions with respect to the light emitting element 11 disposed on the surface thereof. However, depending on the light emitting elements 11 arranged on the surface of the light emitting element substrate 10, if movement in only one direction is sufficient, the number and arrangement of the driving elements may be changed as appropriate. It will be understood by those skilled in the art.

<Other application examples>
In the above embodiment, an example in which the solid-state light source device is mainly adopted as a light source such as a headlamp of a vehicle is described, but HUD and HUD are representative examples used as light sources of other display devices. An example mounted on a very small projector is shown below.

  FIG. 13A shows an example in which the solid-state light source device 100 which is the light source device of the above-described embodiment is applied to HUD. In this figure, in the head-up display device 300, an image displayed on the image display device 310 including a projector or LCD (Liquid Crystal Display) is displayed on the mirror 320 or another mirror 330 (for example, a free curved surface mirror or light The light is reflected by a mirror or the like having an axially asymmetric shape and projected onto the windshield 210 of the automobile 200. On the other hand, the driver D views the image projected as a virtual image forward through the transparent windshield 210 by viewing the image projected on the windshield 210.

  FIG. 13B shows an example of the internal configuration of the head-up display device 300, in particular, the video display device 310. As is apparent from this figure, the image display apparatus 310 is a projector, and the image display apparatus 310 has components such as a light source 311, an illumination optical system 312, and a display element 313, for example. According to the solid-state light source device 100 as the light source device of the present invention described above, the light source 311 has high light output, uniform light distribution, and good illumination light for projection. It is possible to occur.

  It is obvious for those skilled in the art that the light emitted from the above-described image display device 310 is further projected onto the windshield 210 of the automobile 200 via the display distance adjustment mechanism 400 and the mirror drive unit 500. I will.

  FIG. 14 shows an example in which the above-described solid-state light source device 100 of the present invention is applied to a projector. As is apparent from the figure, the projector is composed of a plurality of lens groups denoted by reference symbols G1 to G3 and one mirror denoted by reference symbol M13. In the figure, projected light is indicated by solid and broken arrows.

  Further, in the figure, the light source P0 and the image display element P1 (reflection type image display element) are disposed on the opposing surface of the prismatic optical element, where the solid-state light source device 100 of the present invention described above as the light source P0. By adopting this, it is possible to generate good illumination light having high light output and uniform light distribution.

  As described above in detail, when the solid-state light source device 100 according to an embodiment of the present invention is used as a light source for illumination of a display device, an image having high output and excellent uniformity of light distribution It is possible to realize

  In the above, the planar light source device suitable for using for the electronic device provided with the image display device which concerns on various embodiment of this invention was described. However, the present invention is not limited to the above-described embodiment, but includes various modifications. For example, the above-described embodiment describes the entire system in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to one having all the described configurations. Also, part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. . In addition, with respect to a part of the configuration of each embodiment, it is possible to add, delete, and replace other configurations.

  DESCRIPTION OF SYMBOLS 10 ... Light emitting element substrate, 11 ... Light emitting element (LED), 20 ... Linear motion mechanism, 21 ... Frame, 22 ... Cam, 23 ... Motor, 24 ... Rotation axis, 100 ... Solid-state light source device.

Claims (9)

A solid-state light source device comprising a solid-state light emitting element, comprising
A substrate on which at least one or more solid state light emitting devices are mounted on one side;
Within a predetermined region of a plane parallel to the substrate surface, the position of the solid light emitting element on the substrate is moved to a different position within the plane within a predetermined time within the time resolution of human eyes. A motion mechanism that applies motion to the substrate to repeat motion to return to the position of
A solid-state light source device provided. In the solid-state light source device according to claim 1,
The solid-state light source device is a plurality of solid-state light-emitting elements, which are arranged on the one surface of the substrate with a gap of at least one width of the solid-state light-emitting elements. In the solid-state light source device according to claim 2,
The solid light emitting devices are at least four or more, and each of the solid light emitting devices has a first direction along the one surface of the substrate and a second direction orthogonal to the first direction. And the solid light emitting devices are spaced apart from each other by one width.
The solid-state light source device, wherein the movement mechanism is configured to provide movement of the substrate in the first direction and the second direction. In the solid-state light source device according to claim 1,
The plurality of solid state light emitting devices are arranged adjacent to each other in a first direction along the one surface of the substrate,
The motion mechanism is a solid state light source device, which applies the motion in a second direction orthogonal to the first direction.   The electronic device which employ | adopted the solid-state light source device of any one of Claims 1-4 as a light emission source. In the electronic device according to claim 5,
The electronic device is a headlamp of a vehicle. In the electronic device according to claim 5,
The electronic device is an image projection device for a vehicle. In the electronic device according to claim 5,
The electronic device is a head-up display. In the electronic device according to claim 5,
The electronic device is a projector.

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