TW201937221A - Light source device and display device using same - Google Patents

Abstract

The purpose of the present invention is to provide a thin light source device capable of efficiently spreading and evening out the emission light from a light source. For this purpose, in one preferable aspect according to the present invention a light source device comprises: a light source; a split block for emitting the light from the light source in a first direction and a second direction different from the first direction, the split block made of a base material that is transparent to light with particles mixed therein; a compositing emission block whereon the light emitted in the first direction is incident; and a lightguide block whereon the light emitted in the second direction is incident and which guides light in a different direction than the first direction. The light guided by the lightguide block in a direction different from the first direction enters the compositing emission block.

Description

Light source device and display device using same

The present invention relates to a light source device and a display device using the same.

A technique for an LED (Light Emitting Diode) planar light source device is disclosed in Japanese Laid-Open Patent Publication No. 2006-294343 (Patent Document 1). The light is dimmed from a plurality of LED light sources mixed in the light guide plate to reduce the size. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2006-294343

[The problem that the invention wants to solve]

The backlight for an image display device for a display must mix light from RGB (Red Green Blue) LEDs to diffuse the light into a panel size and homogenize it. In recent years, the development of image devices for wearable devices represented by head-mounted displays has been continuously developed. Since the wearable device is worn on the body, a power-saving and compact image display device is sought. Therefore, as a backlight thereof, a highly efficient and thin light source device is required.

In Patent Document 1, as a backlight for a liquid crystal display device, RGB LED light is incident from an end surface of a thin light guide body containing particles, and is mixed to diffuse light. However, since the light is incident from the end surface of the light guide body, the center portion of the light guide body becomes darker than the end portion, and it is difficult to make the light uniform throughout the light guide body. Further, since the particles are dispersed throughout the light guide, it is not possible to efficiently mix and homogenize the light.

An object of the present invention is to provide a thin light source device and a display device using the same that efficiently diffuse and homogenize emitted light from a light source. [Technical means to solve the problem]

A preferred embodiment of the present invention is a light source device comprising: a light source; and a partitioning block that emits light from the light source in a first direction and a second direction different from the first direction, and is opposite to The light-transparent base material is mixed with the particles; the synthetic emission block is configured to be incident on the light emitted in the first direction; and the light guiding block is incident on the light emitted in the second direction, and the light is guided to the first The direction of the direction is different; and the light guided by the light guiding block in a direction different from the first direction is incident on the synthetic exit block.

A further preferred aspect of the present invention is a display device comprising a light source device, an image generating device for generating an image, and an optical system for projecting an image using light from the light source device. The light source device includes a light source and a block optical element, and the block optical element includes a block-shaped transparent body and a block-shaped particle body in which a transparent base material is mixed with particles that scatter light, and the transparent body is The particle bodies are combined to homogenize the light.

The problems, configurations, and effects other than the above are clarified by the following description of the embodiments. [Effects of the Invention]

A thin-type light source device that efficiently diffuses light and diffuses light from a light source over a wide area and a display device using the same can be provided at low cost.

In the following, the embodiments for carrying out the invention are described based on the illustrated embodiments, but the invention is not limited thereto. In the drawings, the same reference numerals will be given to those having the same functions, and overlapping descriptions may be omitted.

When a plurality of elements having the same function or having the same function have a plurality of cases, the same symbols are sometimes marked with different subscripts. However, when it is not necessary to distinguish a plurality of elements, the subscript may be omitted for explanation.

The expressions "1st", "2nd", "3rd", etc. in the present specification and the like are labeled for identifying the constituent elements, and are not necessarily limited to the number, order, or contents thereof. Further, the serial number for identifying the constituent elements is used for each context, and the serial number used in one context does not necessarily represent the same configuration in other contexts. Further, the function of identifying the component identified by a certain number and the component identified by another serial number is not hindered.

In order to facilitate understanding of the invention, the position, size, shape, range, and the like of each configuration shown in the drawings and the like may not represent actual positions, sizes, shapes, ranges, and the like. Therefore, the present invention is not necessarily limited to the position, size, shape, range, and the like disclosed in the drawings and the like.

In the present specification, the constituent elements expressed in the singular form are included in the plural form as long as they are not explicitly indicated in the special context.

The outline of one of the embodiments to be described below will be described. The light source device according to the present embodiment includes a light source and a block optical element. The block optical element is a block-shaped transparent body and a particle body in which a transparent body is mixed with particles that scatter light. A transparent system directs light into a light guiding block, the particle system splits the light dividing block, and a synthetic emitting block that combines light and emits light. Further, the light source device is realized by dividing the light emitted from the light source into the divided blocks, guiding the light in the light guiding block, and synthesizing the combined emitting blocks. In the present specification, the term "transparent" refers to the transmission of light required to maintain its use or purpose, and is not limited to 100% transparency. [Example 1]

Embodiment 1 of the present invention will be described below using Fig. 1. Fig. 1(A) is a perspective view of the light source device 1 in the present embodiment, and Fig. 1(B) is a perspective view showing the internal structure of the light source device 1 separately. As shown in FIG. 1(B), the light source device includes a plurality of wavelength light sources 2, a reflector 3, a light guiding block 4 inside the reflector 3, a dividing block 5, and a synthetic outgoing block 6. For the sake of convenience, the direction of the optical axis of the light of the plurality of wavelength light sources 2 is set to the z direction, and the direction perpendicular to the plane of the light is set to the x direction (in the longitudinal direction of the light source device 1 in FIG. 1), The vertical coordinate system is defined in advance by setting the other direction to the y direction (the short side direction of the light source device 1 in Fig. 1). When the optical axis is in the case where the intensity of the emitted light is present, the direction of the highest intensity is set to the optical axis direction, but it is generally considered to be perpendicular to the direction of the end face of the LED chip that becomes the light source.

The dividing block 5 is disposed on the front surface of the reflector opening 8 and is provided in such a manner that light of the plurality of wavelength light sources 2 is incident on the dividing block 5. The light guiding block 4 is disposed on the left and right sides (x direction) of the sheet of the divided block 5 in two. The synthetic exit block 6 is disposed so as to cover the exit surface 37 of the light source device 1. The size of the exit surface 37 is about 4 mm on the short side and about 10 mm on the long side. Further, the thickness of the light source device 1 is assumed to be about 2 mm. The light guiding block 4, the divided block 5, and the combined outgoing block 6 are sized by the size of the contrast reflector 3, and can be disposed in the reflector 3 without a gap. At this time, an air layer of a specific thickness is optically interposed between the blocks. Further, each block can be fixed by using an adhesive or a screw or the like.

The light guiding block 4 is a rectangular parallelepiped transparent body formed of a first resin having high transparency, and has a function of sealing light into the light entering the light guiding block 4 by total reflection inside the first resin. And the light is transmitted to the facing surface where the light of the light guiding block 4 is incident.

The divided block 5 is obtained by mixing particles 7 for scattering light into a rectangular parallelepiped transparent body formed by using a first resin having high transparency as a base material. The particle 7 is also a second resin having high transparency, and its diameter is assumed to be 2 μm. The first resin and the second resin can impart a scattering function by refraction by making the refractive indices different. By the scattering function, the direction of travel of the light can be changed, and the light is split in the block 5. Furthermore, the light guiding block 4 is substantially free of the particles 7, but the light guiding block 4 may also contain the particles 7 at a lower density than the divided blocks 5 as needed.

Similarly to the divided block 5, the synthetic emission block 6 is obtained by mixing particles 7 for scattering light into a square column formed of a first resin having high transparency. The synthetic exit block 6 has a function of homogenizing and mixing light by a scattering function.

The reflector 3 covers a region other than the region where the light from which the light of the plurality of wavelength light sources 2 is incident and the region where the light exiting the composite block 6 is emitted, and the light is efficiently guided to the synthetic exit block 6.

A rectangular-array-shaped transparent body formed of a highly transparent resin and a particle 7 in which light is scattered are mixed in the transparent body are collectively referred to as a block optical component. After the second embodiment, the block optical elements such as the light guiding block, the divided block, and the synthetic outgoing block can be produced in the same manner as in the first embodiment. Further, in the above, the light guiding block, the divided block, and the synthetic emitting block are made of the first resin as a matrix, and if necessary, the particles of the second resin are mixed, but different types may be used for each block. The resin acts as a matrix and is mixed with different kinds of particles. However, if the type of material is limited, it is advantageous in terms of manufacturing cost. Further, in the above embodiment, a plurality of blocks are combined, but the same effect can be obtained even if the particles are integrally molded and partially mixed.

2 is a cross-sectional view of the light source device of FIG. 1. The path of the light emitted from the complex-wavelength light source 2 to the exit surface 37 of the light source device 1 will be described with reference to FIG. In addition, although FIG. 2 is a cross-sectional view, in order to show the path of light, there is a portion where no hatching is applied.

Light emitted from the complex wavelength light source 2 is incident from the reflector opening 8 to the divided block 5. The light incident on the divided block 5 is divided into three parts, that is, the light 9a incident on the synthetic outgoing block 6 and the light guiding block 4 incident on the left and right (x direction) of the paper disposed on the divided block 5 The light of 10. The light 10 incident on the light guiding block 4 is guided to the light guiding block exit surface 11 and is emitted from the light guiding block exit surface 11. The emitted light is reflected by the reflector taper 12 and is incident on the resultant exit block 6 as shown by the light 9b.

The divided light in the divided block 5 advances along the above path, is incident on the synthetic outgoing block 6, and is synthesized in the synthetic outgoing block 6 and is emitted from the exit surface 37 of the light source device 1.

FIG. 3 shows the luminance distribution obtained in the light source device 1. A broken line 13 indicates the luminance distribution of the light 9b incident from the divided block 5 through the light guiding block 4 to the synthetic outgoing block 6, and a broken line 14 indicates the brightness of the light 9a directly incident from the divided block 5 to the synthetic outgoing block 6. Distributor. The three luminance distributions indicated by the dashed line 13 and the broken line 14 are combined in the synthetic exit block 6 to obtain a uniform luminance distribution as the solid line 15.

As described above, the light guiding block 4 has a function of encapsulating light by total reflection inside the resin and transmitting the light to the surface facing the incident. In order to allow light incident at any angle to be enclosed by total reflection and to conduct light, the refractive index of the first resin is preferably 1.41 or more. Further, when the refractive index is increased, the transparency of the transparent body is lowered, so that the refractive index is preferably set to 1.60 or less. The material of the light guiding block 4 is not limited to a resin, as long as the transparency is high, such as a transparent body of glass.

As described above, the divided block 5 has a function of splitting light by scattering the light by the particles 7 in the resin for the incident light, and dividing the incident light into light emitted from the exit surface facing the incident surface, and Light in a direction other than the light emitted from the exit surface perpendicular to the incident surface.

When the particle density of the partitioning block 5 is small, the encapsulation achieved by total reflection inside the resin acts more strongly than the division achieved by particle scattering, so that the light incident on the partitioning block 5 is self-injected. The amount of light that comes out of the face is getting bigger. When the particle density of the partitioning block 5 is large, the division by the particle scattering is more strongly performed by the encapsulation achieved by the total reflection inside the resin, so that it is emitted from the plane perpendicular to the incident surface. The amount of light becomes larger.

Therefore, if the particle density of the divided block 5 is reduced, the luminance indicated by the broken line 13 in FIG. 3 becomes low, and the luminance indicated by the broken line 14 becomes high. On the contrary, if the particle density of the divided block 5 is increased, the luminance indicated by the broken line 13 in FIG. 3 becomes high, and the luminance indicated by the broken line 14 becomes low. By adjusting the particle density of the partitioning block 5, the luminance distribution emitted from the light source device 1 can be set to a desired distribution.

FIG. 4 shows another example of the luminance distribution obtained in the light source device 1. For example, in a projector, in general, the uniformity of distribution is sufficient if the ratio of the maximum value to the minimum value of the luminance distribution is 0.5. In this case, the particle density of the divided block 5 is reduced, the brightness indicated by the broken line 13 in FIG. 3 is lowered, and the brightness indicated by the broken line 14 is increased, whereby the desired uniformity can be maintained as shown in FIG. Increase the brightness on one side.

FIG. 5 shows still another example of the luminance distribution obtained in the light source device 1. Further, if the center luminance is required, by further reducing the particle density of the divided block 5, a distribution having a high center luminance can be formed as shown in FIG.

FIG. 6 is still another example of the luminance distribution obtained in the light source device 1. By increasing the particle density of the divided block 5, the brightness indicated by the broken line 13 can be increased, the brightness indicated by the broken line 14 can be lowered, and the brightness distribution can be divided as shown in FIG. By changing the particle density in this manner, the light of the complex wavelength source 2 can be converted into a specific distribution. For example, in the configuration of Fig. 6, an indicator for emitting light in a plurality of parts or the like can be used.

As described above, the luminance distributions of FIGS. 3 to 6 can be controlled by changing the particle density of the partitioning block 5. As another method, it can be controlled by changing the thickness D of the divided block 5. The thickness D of the divided block 5 is increased, and the optical path length from the light of the complex wavelength source 2 to the synthetic exit block 6 is lengthened, whereby the amount of scattering is increased to increase the amount of light divided. Further, as another method, it can be controlled by changing the refractive index of the particles of the divided block 5. By increasing the difference in refractive index between the first resin as the matrix and the second resin as the particles, the amount of scattering can be increased to increase the amount of light divided. Furthermore, these methods can also be combined.

As described above, the synthetic exit block 6 has a function of synthesizing the luminance distribution and emitting it from the light source device. If the particle density is small, the synthesis function by particle scattering becomes small. For example, the dotted line 13 and the broken line 14 of the luminance distribution in Fig. 3 become dark. The dark area can be eliminated by moderately adjusting the particle density. In order to eliminate the darkness, it is also effective to increase the height T of the synthetic exit block 6.

As described above, the reflector 3 has a function of transmitting light emitted from the light guiding block 4 to the synthetic exiting block. Further, there is also a function of reflecting the light traveling in the direction opposite to the exit surface 37 of the light source device 1 by the scattering of the synthetic emission block 6 and returning it to the synthetic emission block 6. The reflector 3 is preferably a white resin having a high reflectance. For example, if MS-2002 manufactured by Dow Corning Toray Co., Ltd. is used, a high reflectance of about 97% can be achieved. Of course, even if the reflector is not white resin, as long as the reflectance is high, it can be a metal such as a specular reflection of the mirror.

The diameter of the particles 7 is larger than the wavelength of the light emitted from the complex wavelength light source 2, and is preferably set to 10 times or less. The reason for this is that if the principle of Mie scattering is set to be the same as the wavelength of light, backscattering increases and the loss of light becomes large. Moreover, when it is 10 times or more, since light does not scatter, the function of diffusing light becomes small.

Figure 7 is a plan view of a complex wavelength source 2. As shown in FIG. 7, the complex wavelength light source 2 emits a red-wavelength light source 16 of a red, green, and blue wavelength band, a green wafer 17, and a blue crystal chip 18 in a single-frame multi-wavelength light source. The complex-wavelength light source 2 includes a plurality of light sources that emit light of at least two or more different wavelength bands. As shown in FIG. 1 and FIG. 2, the surface of the synthetic projection block 6 that is in contact with the division block 5 is a rectangle, and the longitudinal direction of the rectangle (substantially equal to the longitudinal direction of the light source device 1) and a plurality of light sources are connected. The center line is roughly orthogonal.

As described above, the light of the red, green, and blue bands emitted from the complex-wavelength light source 2 is incident on the divided block 5. Therefore, the width W and the height H of the divided block 5 are set to be larger than the width WL and the height HL of the maximum outer shape of the red wafer 16, the green wafer 17, and the blue wafer 18 mounted on the complex wavelength light source 2. Further, in design, it is preferable to make the centers of the red wafer 16, the green wafer 17, and the blue wafer 18 coincide with the center of the divided block 5 (in the figure, the horizontal line 19 and the vertical line 20 intersect).

In order to homogenize the light without uneven color, it is preferable that the ratio of light guided to the red wafer 16, the green wafer 17, and the blue wafer 18 of the light guiding block 4 is equal. Therefore, the red wafer 16, the green wafer 17, and the blue wafer 18 of the complex wavelength light source 2 are preferably arranged in a line in the direction of the vertical line 20.

The complex wavelength light source 2 is located at a different position in the wafers of the respective colors as shown in FIG. In general, if the axes of light of a plurality of wavelengths are different, it is difficult to uniformly mix the lights. The divided block 5 also has a function of diffusing and uniformly mixing light of a plurality of wavelengths emitted from the complex wavelength light source 2 by particle scattering.

As described above, the block optical element is a square column formed of a first resin having high transparency, and the particles 7 of the second resin are filled therein. For example, HITALOID (trademark) 9501 manufactured by Hitachi Chemical Co., Ltd. is used as the first resin. It is an urethane-based photocurable resin having a refractive index of 1.51 at a wavelength of 550 nm. Further, the particles 7 of the second resin are TECHPOLYMER (trademark) SSX-302ABE manufactured by Sekisui Chemicals Co., Ltd. It is a particle formed by bridging a polystyrene resin. When the wavelength is 550 nm, the refractive index is 1.59, the shape is spherical, and the average diameter is 2 μm. The overall 95% of the particles are within 0.5 μm of the average diameter. Single dispersed particles.

Also, the block optical element can be manufactured as follows. First, in the photohardenable resin, the particles are blended in a desired ratio in a volume ratio as a whole, and stirred by a stir bar for about 10 minutes. After stirring, it is naturally left for 4 hours or more, thereby sufficiently defoaming. A space of a desired size is formed by surrounding the bottom surface and the side surface with a metal plate, and a resin is poured therein to cover the glass plate from above. At this time, air is not allowed to enter the inside. Thereafter, a UV (Ultraviolet) lamp is irradiated through the glass to sufficiently cure the resin to form the resin sheet 21. Thereafter, the resin sheet 21 is taken out and cut into a desired size by a cutter.

Fig. 8 shows a resin plate 21 and a horizontal cutting line 22, a vertical cutting line 23, and an oblique cutting line 24 which are cut by a cutter. By cutting the resin sheet 21 vertically and horizontally like the horizontal cutting line 22 and the vertical cutting line 23, it is possible to easily manufacture a plurality of square-corner block optical elements from one resin sheet. Further, if the cutting is performed by the cutter as in the oblique cutting line 24 in addition to the horizontal cutting line 22 and the vertical cutting line 23 of the cutter, the block optical element of the plurality of triangular columns can be easily manufactured. In the method of cutting a flat plate by a cutter, since a plurality of block optical elements can be manufactured at one time, it is advantageous in terms of cost. Since the block optical element needs to be irradiated with a UV lamp, it can also be manufactured using a transparent mold.

Fig. 9 is a view showing a configuration in which a polarizing film 25 is attached to the exit surface 37 of the light source device 1 shown in Fig. 1 . Since a display such as a transmissive liquid crystal or a reflective liquid crystal (LCOS) utilizes a polarizing characteristic, if the polarizing film 25 is applied to the exit surface 37 as shown in FIG. 9, the emitted light can be converted into a polarizing characteristic suitable for the display. . Next, an image device using the light source device shown in Fig. 1 will be described.

FIG. 10 is a schematic diagram showing the image device 26. The video device 26 is attached to the light source device 1 to which the polarizing film 25 shown in FIG. 9 is attached, and the display 27 is attached thereto. The display 27 assumes a transmissive liquid crystal and generates an image by using polarized light as described above. Further, a configuration is adopted in which the polarizing film 28 is attached to the display 27 to transmit the image light, but the non-image light is not transmitted. The polarizing film 28 is preferably an absorbing type polarizing film. By using the absorbing type polarizing film, multiple reflection between the polarizing films 25 and 28 is prevented, whereby the effect of preventing the contrast from being lowered can be obtained. Next, the head-mounted display will be described.

Figure 11 is a schematic view of a head mounted display. The head mounted display itself has various known configurations, but basically includes an image device that produces an image, and an optical system that transmits and projects the generated image to the eye (retina) of the user. In FIG. 11, the head mounted display 29 is provided with a video device 26, a projection optical system 30, and a projector 31 on the left and right sides of the paper. The head mounted display 29 is of a double eye type and is configured to be bilaterally symmetrical on the paper surface so that the image can be projected to the left and right eyes of the user 32. The head mounted display 29 transmits the image generated in the image device 26 to the eye using the projection optical system 30 and the projector 31.

The projection optical system 30 is constituted by an optical system such as a lens, and the projector 31 projects a video using a thin plate for transmitting a diffracted image. In recent years, the development of projectors using diffraction image transmission has been continuously developed, and a head-mounted display having a high perspective has been realized. The imaging device 26 implements a miniaturizer for use in a wearable use such as a head mounted display.

Figure 12 is a system diagram of a head mounted display 29. The head mounted display 29 includes a control circuit 33, a power source 34, a video device 26, a projection optical system 30, a projector 31, an image processing circuit 35, and an operation processing unit 36.

The control circuit 33 has the function of controlling the head mounted display 29. The image processing circuit 35 has a function of changing the image by driving the display 27 in the image device 26 with respect to the image signal. The operation processing unit 36 has a function of transmitting operation information from the head mounted display 29 of the user 32 to the control circuit 33. For example, it is realized by voice recognition, gesture recognition, or an electrostatic touch panel. When the user 32 operates the head mounted display 29, the operation processing section 36 transmits the operation information to the control circuit 33.

The control circuit 33 causes the plurality of wavelength light sources 2 provided in the image device 26 to emit light via the power source 34 based on the operation information. The control circuit 33 drives the display (microdisplay) 27 via the image processing circuit 35 to generate the desired image from the light emitted from the complex wavelength source 2. The generated image is transmitted from the projection optical system 30 and the projector 31 to the eyes of the user.

As described above, the light source device 1 is optimal as a light source for a small image device 26 such as a small and lightweight head mounted display 29. [Embodiment 2]

Next, a second embodiment of the present invention will be described with reference to Figs. 13 to 15 . Here, a modification of the light source device 1 of Fig. 1 will be described.

Fig. 13(A) is a perspective view of the light source device 38 of the second embodiment, and Fig. 13(B) is a perspective view showing the internal structure of the light source device 38 separately. As shown in FIG. 13(B), the light source device 38 includes a plurality of wavelength light sources 2, a reflector 39, and light guiding blocks 40, 41 inside the reflector 39, divided blocks 42, 43 and a combined outgoing block 44.

As shown in FIG. 13, the light source device 38 is further disposed on the side of the light guiding block 40 with the divided block 43 and the light guiding block 41, which is different from the light source device 1 of FIG. The configuration or material of the light guiding block and the divided block can be the same as in the first embodiment.

Figure 14 is a cross-sectional view showing the light source device 38 in the second embodiment. The path of the light emitted from the complex-wavelength light source 2 to the light exiting from the exit surface 45 of the light source device 38 will be described using a cross-sectional view of the light source device 38 and FIG.

The light emitted from the complex-wavelength light source 2 is incident from the reflector opening 46 to the divided block 42 and is divided into three portions, that is, the light 50a incident on the combined emission block 44, and incident on the divided block 42. The light 47 of the light guiding block 40 on the left and right (x direction).

The light 47 incident on the light guiding block 40 is guided to the divided block 43. The light incident on the division block 43 is divided into light 50b incident to the synthesis exit block 44 and light incident on the light guide block 41.

The light incident on the light guiding block 41 is guided to the light guiding block exit surface 48, and is emitted from the light guiding block exit surface 48. The emitted light is reflected by the reflector tapered portion 49 and incident on the light 50c of the synthetic exit block 44.

The divided light at the divided blocks 42, 43 proceeds along the above path, and is incident on the synthetic outgoing block 44 (lights 50a, 50b, 50c), respectively, and synthesized at the synthetic outgoing block 44, and from the exit surface 45 of the light source device 38. Exit.

Fig. 15 shows the luminance distribution obtained in the light source device 38. The dotted line 51 indicates the luminance distribution of the light 50a incident to the synthetic exit block 44, the broken line 52 indicates the luminance distribution of the light 50b incident to the synthetic outgoing block 44, and the broken line 53 indicates the luminance of the light 50c incident to the synthetic outgoing block 44. distributed. The five luminance distributions indicated by the broken lines 51, 52, and 53 are combined in the synthetic emission block 44 to obtain a uniform luminance distribution indicated by the solid line 54.

The particle density of the divided blocks 42, 43 can be adjusted in the same manner as in Embodiment 1 to obtain a desired luminance distribution. As in the second embodiment, by using a plurality of divided blocks and light guiding blocks, light can be efficiently transmitted to a wider exit area and made uniform. [Example 3]

The third embodiment of the present invention will be described with reference to Figs. 16 and 17 . Fig. 16(A) is a perspective view of the light source device 55 in the third embodiment, and Fig. 16(B) is a perspective view showing the internal structure of the light source device 55 in an individual manner. As shown in FIG. 16(B), the light source device 55 includes a plurality of wavelength light sources 2, a reflector 56, a light guiding block 59 inside the reflector 56, a dividing block 60, and a synthetic outgoing block 61.

The shape of the reflector 56, the light guiding block 59, and the dividing block 60 of the light source device 55 is different from that of the light source device 1 of FIG. With this shape, the direction in which light enters from the opening 57 is different from the direction in which light is emitted from the exit surface 58.

The opening 57 of the reflector 56 is disposed on a surface perpendicular to the exit surface 58 of the light source device 55, and the light from the complex wavelength source 2 is incident from a surface perpendicular to the exit surface 58 of the light source device 55. In this configuration, the direction from which the light from the complex wavelength source 2 is incident on the opening 57 is orthogonal to the direction in which the light exits from the exit surface 58.

The light guiding block 59 and the dividing block 60 are different from the light guiding block 4 and the divided block 5 of the light source device 1, and are triangular prisms. The block optics of the triangular prism can be reflected by the inner surface of the block optical element to change the direction of travel of the light incident on the block optical element. When the optical axis of the plurality of wavelength light sources 2 and the exit surface 58 are perpendicular to each other as in the light source device 55, light can be efficiently transmitted to the exit surface 58 by using the block optical element of the triangular prism.

Fig. 17 is a cross-sectional view showing the light source device 55 cut at the face 62. The light incident from the complex wavelength source 2 can be transmitted to the exit surface 58 of the light source device 55 by the inner surface reflection of the slanted surface 63 of the block optical element. Further, the divided block 60 separates the light in the vertical direction (x direction) of the paper and sends it to the light guiding block 59. Even if the positional relationship between the light source and the exit surface is limited, it is possible to efficiently transfer and homogenize the light by using the block optical element of the triangular prism as in the third embodiment. In the present embodiment, the optical axis of the complex wavelength source 2 is perpendicular to the exit surface 58, but can also be formed at an angle other than perpendicular. [Example 4]

Embodiment 4 of the present invention will be described with reference to Figs. 18 and 19 . 18(A) is a perspective view of the light source device 126 in the fourth embodiment, and FIG. 18(B) is a perspective view showing the internal structure of the light source device 126 separately. As shown in FIG. 18(B), the light source device 126 includes a plurality of wavelength light sources 2, a reflector 128, a light guiding block 129 inside the reflector 128, a dividing block 130, and a synthetic outgoing block 131.

The shape of the reflector 128, the light guiding block 129, and the dividing block 130 of the light source device 126 is different from that of the light source device 1 of FIG. The direction in which light is incident from the opening 132 is different from the direction in which light is emitted from the exit surface 133. The light guiding block 129 and the dividing block 130 are different from the light guiding block 4 and the divided block 5 of the light source device 1, and have a triangular prism shape.

Fig. 19 is a cross-sectional view showing the light source device 126 cut at a surface 127. By arranging the synthetic exit block 131 and the slope 134 of the block optical element, the direction of light emission can be changed to be perpendicular to the slope 134. Further, the divided block 130 separates the light in the vertical direction (x direction) of the paper and sends it to the light guiding block 129. By using the inclined surface of the triangular optical element block optical element, even if the arrangement relationship between the display such as a transmissive liquid crystal or a reflective liquid crystal (LCOS) and the light source device is limited, a light source capable of efficiently transmitting light to the display device can be realized. Device. [Example 5]

Embodiment 5 of the present invention will be described using FIG. Here, a modification of the light source device 1 of Fig. 1 will be described. Fig. 20(A) is a perspective view of the light source device 64 in the fifth embodiment, and Fig. 20(B) is a perspective view showing the internal structure of the light source device 64 in an individual manner. As shown in FIG. 20(B), the light source device 64 includes a monochromatic light source 125, a reflector 65, and light guiding blocks 66, 67, a dividing block 68, and a synthetic exiting block 69 inside the reflector 65.

The light guiding block 66 is disposed on the left and right (x direction) of the dividing block 68, and the light guiding block 67 is disposed above and below the dividing block (y direction), and the complex wavelength light source 2 is the monochromatic light source 125. It is different from the light source device 1 of Fig. 1 .

The path of the light emitted from the monochromatic light source 125 to the exit surface 70 of the light source device 64 will be described. Light emitted from the monochromatic light source 125 is incident from the reflector opening 71 to the partition block 68. The light incident on the divided block 68 is divided into five parts, that is, light incident on the combined emission block 69 and light incident on the light guide blocks 66 and 67 disposed on the upper and lower sides of the divided block. The light incident on the light guiding blocks 66, 67 is respectively guided to the facing surface with respect to the incident and exits. The emitted light is reflected by the reflector taper 72 and is incident on the resultant exit block 69. The light split by the divided block 68 is incident on the synthetic outgoing block 69 as described above, and is synthesized and emitted from the exit surface 70 of the light source device 64.

Unlike the first embodiment, the light source is only the monochromatic light source 125, and color unevenness does not occur, so that light can be guided upward and downward. In the same manner as in the first embodiment, by adjusting the particle density of the divided block 68, the amount of light divided can be adjusted, and the brightness distribution of the light emitted from the light source device 64 can be made uniform by synthesizing each of the synthesized output blocks. As in the fifth embodiment, by arranging the light guiding block in the direction in which the light is to be diffused, the light can be diffused in a desired direction and homogenized. [Embodiment 6]

Embodiment 6 of the present invention will be described with reference to Figs. 21 to 23 . Here, a modification of the light source device 1 of Fig. 1 will be described. 21(A) is a perspective view of the light source device 73 in the sixth embodiment, and FIG. 21(B) is a perspective view showing the internal structure of the light source device 73 in an individual manner. As shown in FIG. 21(B), the light source device 73 includes a plurality of wavelength light sources 2, a reflector 74, and a light guiding block 75 inside the reflector 74, a dividing block 76, and a synthetic outgoing block 77.

The position of the complex wavelength light source 2 and the configuration of the block optical element are different from those of the light source device 1. In this configuration, the direction in which the complex-wavelength light source 2 is incident on the opening 78 is orthogonal to the direction in which the exit from the exit surface 79 is emitted. As shown in FIG. 21(B), the division block 76 is disposed immediately after the reflector opening 78, and the light of the plurality of wavelength light sources 2 is incident on the division block 76. Further, the light guiding block 75 is disposed in contact with the divided block 76 as shown in FIG. 21(B). The synthetic exit block 77 is disposed to cover the exit surface 79 of the light source device 73.

22 is a cross-sectional view of the light source device 73. The path of the light emitted from the complex-wavelength light source 2 to the exit surface 79 of the light source device 73 will be described with reference to FIG.

Light emitted from the complex wavelength source 2 is incident from the reflector opening 78 to the segment block 76. The light incident on the division block 76 is divided into two parts, that is, the light 80a incident on the combined emission block 77 and the light 81 incident on the light guiding block 75 disposed beside the division block 76. The light 81 incident on the light guiding block 75 is guided to the light guiding block exit surface 82, and is emitted from the light guiding block exit surface 82. The emitted light is reflected by the reflector tapered portion 83, and is incident on the synthetic exit block 77 as the light 80b.

The divided light passing through the dividing block 76 advances along the above path, and is incident on the combined outgoing block 77 (lights 80a, 80b), synthesized in the combined outgoing block 77, and emitted from the exit surface 79 of the light source device 73.

FIG. 23 shows the luminance distribution obtained by the light source device 73. The dotted line 84 indicates the luminance distribution of the light (80a) directly incident from the divided block 76 to the resultant outgoing block 77, and the broken line 85 indicates the light incident from the divided block 76 through the light guiding block 75 to the resultant outgoing block 77 ( 80b) brightness distribution. The two luminance distributions indicated by the dashed line 84 and the dashed line 85 are combined in the synthetic exit block 77 to obtain a uniform luminance distribution as the solid line 86.

In the same manner as in the first embodiment, by adjusting the particle density of the divided block 76, the amount of divided light (80a, 80b) can be adjusted, and by combining each of the synthesized outgoing blocks, a desired luminance distribution can be obtained. Even if there is a limit to the positional relationship between the light source and the exit surface, the light can be made uniform by arranging the block optical element as in Embodiment 6. [Embodiment 7]

The configuration of the light source device 87 of the seventh embodiment of the present invention will be described with reference to Figs. Fig. 24 is a perspective view of the light source device 87. Fig. 25 is a perspective view showing the internal structure of the light source device 87 separately.

As shown in FIG. 25, the light source device 87 includes a casing 88, a green light source 89, a red light source 90, a blue light source 91, a light guiding block 96 disposed inside the casing 88, and a synthetic exit block 97. Each of the light sources 89 to 90 is disposed in contact with the light guiding block 96, and light emitted from the light sources 89 to 90 is incident on the light guiding block 96 through the openings 93 to 95. The synthetic exit block 97 is disposed so as to cover the exit surface 92 of the light source device 87.

The light guiding block 96 is provided with color separation films 98 and 99. The dichroic film 98 has a function of transmitting green light and reflecting red light, and the dichroic film 99 has a function of transmitting green light and red light and reflecting blue light.

26 is a cross-sectional view of the light source device 87. The path of the light emitted from each of the light sources 89 to 90 to the exit surface 92 of the light source device 87 will be described with reference to Fig. 26 . The green light 100 emitted from the green light source 89 and the red light 101 emitted from the red light source 90 are combined by the dichroic film 98 inside the light guiding block 96 to synthesize the optical axis. Further, the red light and the green light 102 which are advanced by the dichroic film 98 and the blue light 103 which is emitted from the blue light source 91 are combined by the dichroic film 99 inside the light guiding block 96 to synthesize the optical axis. The red, green, and blue combined light 104 is incident on the synthetic exit block 97 and mixed, and is emitted from the exit surface 92 as uniform light.

In general, it is difficult to make the axes of red, green, and blue light completely coincident due to assembly errors. The synthetic emission block 97 is provided to solve the problem that the luminance of the angular component cannot be uniform due to manufacturing errors, and the luminance of the angular component of the light emitted from the exit surface 92 of the light source device 87 is uniformly mixed.

A method of manufacturing the light guiding block 96 having the dichroic films 98 and 99 will be described with reference to Fig. 27 . As shown in FIG. 27(A), the light guiding block 96 includes four triangular shaped light guiding blocks 105 to 108, and a color separation film 98 is applied to the inclined surface 109 of the light guiding block 105 to the light guiding block 107. The color separation film 99 is applied to the slope 110. If the light guiding blocks 105 to 108 are pasted with an adhesive, the light guiding block 96 can be realized. As the transparent adhesive, it is preferred to use the above-mentioned photocurable resin so as not to cause boundary reflection due to mismatch of refractive index. Of course, the blocks may not be pasted first, and after being incorporated into the casing 88, the light-effect resin is poured, thereby illuminating the UV lamp to adhere.

Further, as shown in Fig. 27(B), instead of the light guiding blocks 106, 107, a light guiding block 135 having a parallelogram shape may be used. Further, it is also possible to produce a glass plate or the like which is subjected to color separation vapor deposition on the color separation inclined surface 109 and the inclined surface 110. When the light source device 87 is used as the illumination for the image display device, the transmissive liquid crystal device is disposed on the emission surface 92. When the size of the exit surface 92 is small, a lens may be disposed after the exit surface 92 to expand the emission distribution to illuminate the transmissive liquid crystal device. [Embodiment 8]

The video display device according to the eighth embodiment of the present invention will be described with reference to Figs. 28 is a perspective view of the image display device 111, and FIG. 29 is a perspective view obtained by separately disassembling the image display device 111. As shown in FIG. 28, the video display device 111 includes a light source device 112 and a transmissive liquid crystal panel 113.

As shown in FIG. 29, the light source device 112 includes a plurality of wavelength light sources 114, a combined emission block 116, and a casing 115, and a polarizing film 119 is disposed on the exit surface 118. The size of the incident surface 120 on which the light from the complex wavelength source 114 is incident through the opening 117 is different from the size of the exit surface 121, and the size of the exit surface 121 is set to be the same as the display surface 290 of the image display device 111. degree. When the distance 122 from the incident surface to the exit surface of the light source device 112 is large, even if only the synthetic emission block is used, the light can be efficiently made uniform by reducing the particle density.

Fig. 30 is another example. As shown in FIG. 30, the composite exit block 116 can also be divided into a light guide block 123 and a composite exit block 124. By reflecting inside the light guiding block 123 and then scattering the particles of the synthetic emitting block 124, the light can be efficiently made uniform. Of course, as in the first embodiment, the divided blocks may be disposed immediately after the complex-wavelength light source 114, and the light-guiding blocks may be disposed on the left and right sides of the composite light-emitting block.

By arranging the transmissive liquid crystal panel 113 in the light source device 112, it is possible to provide a low-cost and compact image display device without requiring an optical system generally required for illuminating the liquid crystal panel. The synthetic exit block can also be manufactured by molding, and in the case of mass production, if it is a molded article, the cost can be suppressed.

1‧‧‧Light source device

2‧‧‧Multiple wavelength source

3‧‧‧ reflector

4‧‧‧Lighting block

5‧‧‧Divided blocks

6‧‧‧Synthetic exit block

7‧‧‧ particles

8‧‧‧ openings

9a‧‧‧Light

9b‧‧‧Light

10‧‧‧Light

11‧‧‧Light-emitting block exit surface

12‧‧‧Reflector cone

13‧‧‧ dotted line

14‧‧‧ dotted line

15‧‧‧solid line

16‧‧‧Red Chip

17‧‧‧Green Chip

18‧‧‧Blue Chip

19‧‧‧ horizontal line

20‧‧‧ vertical line

21‧‧‧Resin sheet

22‧‧‧ horizontal cutting line

23‧‧‧Vertical cutting line

24‧‧‧ oblique cutting line

25‧‧‧ polarizing film

26‧‧‧Video device

27‧‧‧ display

28‧‧‧ polarizing film

29‧‧‧ head mounted display

30‧‧‧Projection optical system

31‧‧‧Projector

32‧‧‧Users

33‧‧‧Control circuit

34‧‧‧Power supply

35‧‧‧Image Processing Circuit

36‧‧‧Operation and Processing Department

37‧‧‧Outlet

38‧‧‧Light source device

39‧‧‧ reflector

40‧‧‧Light Guide Block

41‧‧‧Light Guide Block

42‧‧‧Divided blocks

43‧‧‧Divided blocks

44‧‧‧Synthetic exit block

45‧‧‧Outlet

46‧‧‧ reflector opening

47‧‧‧Light

48‧‧‧Light-emitting block exit surface

49‧‧‧Reflector cone

50a‧‧‧Light

50b‧‧‧Light

50c‧‧‧Light

51‧‧‧dotted line

52‧‧‧ dotted line

53‧‧‧ dotted line

54‧‧‧solid line

55‧‧‧Light source device

56‧‧‧ reflector

57‧‧‧ openings

58‧‧‧Outlet

59‧‧‧Lighting block

60‧‧‧Divided blocks

61‧‧‧Synthetic exit block

62‧‧‧ Face

63‧‧‧ Block optical element bevel

64‧‧‧Light source device

65‧‧‧ reflector

66‧‧‧Light guide block

67‧‧‧Light guide block

68‧‧‧Divided blocks

69‧‧‧Synthetic exit block

70‧‧‧Outlet

71‧‧‧ reflector opening

72‧‧‧ reflector cone

73‧‧‧Light source device

74‧‧‧ reflector

75‧‧‧Light guide block

76‧‧‧Divided blocks

77‧‧‧Synthetic exit block

78‧‧‧Reflector opening

79‧‧‧Outlet

80a‧‧‧Light

80b‧‧‧Light

81‧‧‧Light

82‧‧‧Light-emitting block exit surface

83‧‧‧ reflector cone

84‧‧‧ dotted line

85‧‧‧ dotted line

86‧‧‧solid line

87‧‧‧Light source device

88‧‧‧shell

89‧‧‧Green light source

90‧‧‧Red light source

91‧‧‧Blue light source

92‧‧‧Outlet

93～95‧‧‧ openings

96‧‧‧Light guide block

97‧‧‧Synthetic exit block

98‧‧‧Dimerized film

99‧‧ ‧ dichroic film

100‧‧‧Green light

101‧‧‧Red light

102‧‧‧Green light

103‧‧‧Blue

104‧‧‧Red, green and blue light

105～108‧‧‧Light guiding block

109‧‧‧Bevel

110‧‧‧Bevel

111‧‧‧Image display device

112‧‧‧Light source device

113‧‧‧Transmissive LCD panel

114‧‧‧Multiple wavelength source

115‧‧‧Shell

116‧‧‧Synthetic exit block

117‧‧‧ openings

118‧‧‧Outlet

119‧‧‧ polarizing film

120‧‧‧Incoming surface

121‧‧‧Outlet

122‧‧‧ distance

123‧‧‧Light Guide Block

124‧‧‧Synthetic exit block

125‧‧‧monochromatic light source

126‧‧‧Light source device

127‧‧‧ face

128‧‧‧ reflector

129‧‧‧Lighting block

130‧‧‧Divided blocks

131‧‧‧Synthetic exit block

132‧‧‧ openings

133‧‧‧Outlet

134‧‧‧Bevel

135‧‧‧Lighting block

290‧‧‧ display surface

D‧‧‧thickness

H‧‧‧ Height

HL‧‧‧ height

T‧‧‧ Height

W‧‧‧Width

WL‧‧‧Width

X‧‧‧ directions

Y‧‧‧ direction

Z‧‧‧direction

1(A) and 1(B) are schematic perspective views of a light source device 1 in the first embodiment. Fig. 2 is a cross-sectional view showing the light source device 1 in the first embodiment. Fig. 3 is a graph showing the luminance distribution of the exit surface 37 in the first embodiment. Fig. 4 is a graph showing the luminance distribution of the exit surface 37 in the first embodiment. Fig. 5 is a graph showing the luminance distribution of the exit surface 37 in the first embodiment. Fig. 6 is a graph showing the luminance distribution of the exit surface 37 in the first embodiment. Fig. 7 is a schematic plan view showing a plurality of wavelength light sources 2 in the first embodiment. Fig. 8 is a perspective view showing a method of manufacturing a block optical element of a triangular prism in the first embodiment. Fig. 9 is a perspective view showing the polarizing film 25 in the first embodiment. Fig. 10 is a schematic perspective view of the image device 26 in the first embodiment. Figure 11 is a schematic plan view of the head mounted display 29 of the first embodiment. Figure 12 is a block diagram showing the system of the head mounted display 29 in the first embodiment. 13(A) and (B) are schematic perspective views of the light source device 38 in the second embodiment. Figure 14 is a cross-sectional view showing the light source device 38 in the second embodiment. Fig. 15 is a graph showing the luminance distribution of the exit surface 45 in the second embodiment. 16(A) and 16(B) are schematic views of a light source device 55 in the third embodiment. Figure 17 is a cross-sectional view showing a light source device 55 in Embodiment 3. 18(A) and (B) are schematic views of a light source device 126 in the fourth embodiment. Figure 19 is a cross-sectional view showing a light source device 126 in Embodiment 4. 20(A) and (B) are schematic views of a light source device 64 in the fifth embodiment. 21(A) and 21(B) are schematic views of a light source device 73 in the sixth embodiment. Figure 22 is a cross-sectional view showing the light source device 73 in the sixth embodiment. Fig. 23 is a view showing the luminance distribution of the exit surface 79 in the sixth embodiment. Fig. 24 is a schematic view showing a light source device 87 in the seventh embodiment. Fig. 25 is a schematic view showing a light source device 87 in the seventh embodiment. Figure 26 is a cross-sectional view showing a light source device 87 in the seventh embodiment. 27(A) and 27(B) are views showing a method of manufacturing the light guiding block 96 in the seventh embodiment. Figure 28 is a schematic view showing an image display device 111 in the eighth embodiment. Figure 29 is a schematic view showing an image display device 111 in the eighth embodiment. Figure 30 is a schematic view showing a block optical element in Embodiment 8.

Claims (15)

A light source device comprising: a light source; and a divided block that emits light from the light source in a first direction and a second direction different from the first direction, and mixes particles with respect to the light transparent base material And a synthetic emission block for incident light emitted in the first direction; a light guiding block for incident light emitted in the second direction and guiding the light to a direction different from the first direction; And directing, by the light guiding block, light that is directed in a direction different from the first direction to the synthetic emission block; The light source device according to claim 1, wherein the synthetic emission block is a rectangular parallelepiped or a plate shape, and a portion where the light emitted in the first direction is incident and a portion guided by the light guiding block are different from the first direction. The portion where the direction light is incident is a different portion of the same surface of the synthetic emission block. The light source device according to claim 1, wherein the divided block includes a first incident surface on which light from the light source is incident, a first exit surface in which incident light is emitted in the first direction, and the incident light is directed to the second a second emission surface that is emitted in a direction; the synthetic emission block includes a second incident surface on which light emitted from the first emission surface is incident, and a third emission surface on which incident light is emitted; the light guiding block is provided a third incident surface from which the light emitted from the second exit surface is incident and a fourth output surface from which the incident light is emitted; and the light source device includes a reflector that reflects the light emitted from the fourth exit surface And incident on the second incident surface. The light source device according to claim 3, wherein the light emitted from the fourth exit surface is incident on the reflector via the second divided block and the second light guiding block. The light source device according to claim 3, wherein the divided block is configured such that the first incident surface is parallel to the first exit surface, and the first incident surface is perpendicular to the second exit surface. The light source device according to claim 3, wherein the divided block is configured such that the first incident surface is perpendicular to the first exit surface, and the first incident surface is perpendicular to the second exit surface. The light source device according to claim 3, wherein the divided block is configured such that the first incident surface is at an acute angle to the first exit surface, and the first incident surface is perpendicular to the second exit surface. The light source device according to claim 3, wherein the divided block includes a fifth exit surface, and the fifth exit surface emits incident light in a third direction that is different from the first direction and perpendicular to the second direction; Further, the light source device further includes a third light guiding block, wherein the third light guiding block includes a fourth incident surface on which light emitted from the fifth emission surface is incident, and a sixth emission surface on which incident light is emitted; The light source device includes a reflector that reflects light emitted from the sixth exit surface and enters the second incident surface. The light source device according to claim 3, wherein the divided block is configured such that the first incident surface is perpendicular to the first exit surface, and the first incident surface is parallel to the second exit surface. A display device comprising: a light source device, an image device for generating an image, and an optical system for projecting the image by light from the light source device; wherein the light source device includes a light source and a block optical element; The bulk optical element includes a block-shaped transparent body and a block-shaped particle body in which a transparent base material is mixed with particles that scatter light, and the light is made uniform by combining the transparent body and the particle body. The display device of claim 10, wherein the block optical element comprises a light guiding block that guides light as the transparent body, a divided block that is a divided light of the particle body, and a composite that combines light and emits light. An exiting block; dividing the light emitted from the light source into the divided block, guiding light in the light guiding block, and synthesizing and emitting the synthesized outgoing block. The display device according to claim 11, wherein the light source device includes a reflector having a function of reflecting light; and the light emitted from the light source is incident on the divided block, and is divided into light of at least two directions, and the division is 2 One of the light in one direction is incident on the synthetic emission block, and the other is reflected by the reflector through the light guiding block, and is incident on the synthetic emission block. The display device of claim 11, wherein the synthetic emission block and the surface of the divided block are different from a surface on which light emitted from the light source is incident, the synthetic emission block and the light guiding region And the block is disposed in contact with a surface different from a surface of the partition block and the synthetic exit block, wherein the synthesized exit block and the light guiding block and the divided block and the synthetic outgoing block are It is equipped with the connection. The display device of claim 11, wherein the light source comprises a plurality of light sources that emit light of at least two different bands, and the surface of the synthetic output block that is adjacent to the divided block is a rectangle, and the long side of the rectangle The direction is substantially orthogonal to the line connecting the centers of the plurality of light sources. The display device of claim 11, wherein the divided block and the light guiding block are quadrangular prisms or triangular columns.