JP2005208387A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector projecting a high-quality image by illumination whose luminance distribution is easily and economically uniformized even when the luminance distribution exists at a light emitting part. <P>SOLUTION: Since light distribution adjusting members 21b, 23b and 25b are provided to preliminarily uniformize illuminating light, liquid crystal light valves 31, 33 and 35 are made extremely uniform in spite of the non-uniform luminance distribution of the light emitting parts of respective LED packages 21h, 23h and 25h. Thus, the liquid crystal light valves 31, 33 and 35 are illuminated with uniform and sufficient illuminating light quantity, and the high-quality image is formed on a screen. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a projector for projecting a desired image from the front or the back, and more particularly to a projector using a semiconductor element such as an LED package as a light source.

As a projector, an array of LEDs is used as a light source, and the illumination light from the array of LEDs is made uniform by an illumination uniformizing means in which a plurality of rod lenses are arranged, and the polarization state is changed by a polarization converting means in which a polarizing beam splitter is arranged. There are those that are incident on the liquid crystal light valve (see Patent Document 1).
JP 2003-295315 A

  However, in the projector as described above, since the rod lens is provided for each LED, the luminance distribution of the illumination light tends to remain due to the luminance distribution of the light emitting portion of the LED.

  Accordingly, an object of the present invention is to provide a projector capable of projecting a high-quality image with illumination in which the luminance distribution is simply and economically uniform even when the luminance distribution is present in the light emitting unit. To do.

  In order to solve the above-described problems, a projector according to the present invention includes: (a) a light source device having a light emitting unit exhibiting a non-uniform luminance distribution; and (b) modulating illumination light from the light emitting unit to form image light. A plurality of irradiated regions with respect to incident light that is illumination light that is disposed between the light modulating device and (c) the light source device and the light modulating device and is incident on the plurality of irradiated regions provided on the incident side. And a light distribution adjusting means for mitigating the uneven luminance distribution of the light emitting part by performing a partial transition between the respective incident lights after entering the light.

  In the projector described above, the light distribution adjusting means performs partial transition between the respective incident lights with respect to the incident light to the plurality of irradiated areas, and thus relaxes the uneven luminance distribution of the light emitting unit. Efficient uniformization of the illumination light from the non-uniform light emitting unit is possible, and the light modulation device can be illuminated uniformly with a simple light source. Thereby, even when using a light source device in which a luminance distribution is formed by incorporating a plurality of LEDs or other light emitting elements, etc., uniform illumination can be achieved by offsetting the nonuniformity of the luminance distribution of the light emitting part as a light source. It can be performed, and a high-quality image can be projected by such uniform illumination.

  In a specific aspect of the present invention, in the projector described above, the light distribution adjusting unit partially divides incident light incident on one of the plurality of irradiated regions using a reflection phenomenon, and the one irradiated region. The light is emitted together with the light passing through another irradiated region adjacent to. In this case, the unevenness of the luminance distribution of the light emitting unit can be accurately canceled while the adjustment of the transition light quantity is easily performed using reflection, and a high-quality image can be projected with uniform illumination.

  In another specific aspect of the present invention, the light emitting unit has light emitting units arranged at a predetermined interval in a predetermined direction perpendicular to the optical axis, and the light source device has light and dark patterns corresponding to a plurality of irradiated regions. It is formed on the incident surface of the light distribution adjusting means. In this case, the light / dark pattern formed by the light source device having the light emitting units arranged periodically can be made uniform by the light distribution adjusting means.

  In still another specific aspect of the present invention, the light distribution adjusting means has a plurality of optical elements for branching light that are arranged corresponding to each of the plurality of irradiation regions. In this case, it is possible to perform a partial shift between the light beams incident thereon by the plurality of optical branching optical elements.

  In still another specific aspect of the present invention, each optical branching optical element is a prism member that has a semi-transmissive reflective surface and divides and combines incident light through the reflective surface. In this case, efficient uniformization of the illumination light can be achieved in a space-saving manner by utilizing the branching action and the combining action of the prism member.

  In still another specific aspect of the present invention, each prism member is a polarization beam splitter having a polarization separation surface inclined with respect to the optical axis, and has a direction perpendicular to the optical axis and perpendicular to the inclination direction of the polarization separation surface. While extending in the longitudinal direction, they are arranged and joined in the lateral direction. In this case, it is possible to achieve efficient uniformization of the illumination light using polarization separation.

  In still another specific aspect of the present invention, the light source device is a semiconductor light source device in which a plurality of semiconductor light emitting elements are packaged and integrated as a light emitting unit. In this case, it is possible to provide a compact light source device that uses a small and highly efficient semiconductor light emitting device, and thus a projector.

  In still another specific aspect of the present invention, a light uniformizing means is further provided between the light distribution adjusting means and the light modulation device. In this case, more uniform illumination light can be formed by the light uniformizing means, and a higher quality image can be projected.

  In still another specific embodiment of the present invention, the light uniformizing means is a rod integrator. In this case, the illumination light can be made uniform at low cost.

[First Embodiment]
FIG. 1 is a block diagram illustrating the overall structure of the projector according to the first embodiment of the invention. The projector 10 includes a lighting device 20, a light modulation device 30, a projection lens 40, and a control device 50. Here, the illumination device 20 includes a G light illumination device 21, a B light illumination device 23, an R light illumination device 25, and a light source driving device 27. The light modulation device 30 also supplies drive signals to the three liquid crystal light valves 31, 33, and 35 that are spatial light modulation devices, the cross dichroic prism 37 that is a light combining optical system, and the liquid crystal light valves 31, 33, and 35. And an element driving device 38 for outputting.

  In the illumination device 20, the G light illumination device 21 includes a light source device 21a, a light distribution adjusting member 21b, and a rod integrator 21c. Here, the light source device 21a includes a first light source unit 21f and a condenser lens array 21g. The former first light source unit 21f is obtained by mounting a plurality of LED packages 21h, which are semiconductor light source devices, on a surface mounting substrate 21i in a two-dimensional array. Each LED package 21h is green (G G light included in the category of) is generated. The first illumination light IG from the first light source unit 21f is collected without waste by the condenser lens array 21g, and superimposes the entire incident surface IS of the light distribution adjusting member 21b, which is a light distribution adjusting unit. The light distribution adjusting member 21b has a structure in which six polarizing beam splitters PS extending in the Y direction perpendicular to the optical axis are arranged in the X direction and joined, and λ / 2 wavelength for adjusting the polarization direction on the exit side. A plate WP is attached. The illumination light IG from the light source device 21a passes through the light distribution adjusting member 21b, the light source pattern is made uniform in advance, and enters the opposing rod integrator 21c. The rod integrator 21 c further uniformizes the luminance of the illumination light IG, and causes the illumination light IG after the uniformity to enter the liquid crystal light valve 31 for G light in the light modulation device 30.

  FIG. 2 is a diagram for explaining the arrangement relationship between the first light source unit 21f and the light distribution adjusting member 21b, and FIG. 2A is a light emitting unit of each LED package 21h provided in the first light source unit 21f. FIG. 2B is a rear view showing the incident side of the light distribution adjusting member 21b, and FIG. 2C illustrates the illumination state on the incident side of the light distribution adjusting member 21b. It is a figure to do.

  As shown in FIG. 2 (a), the light emitting portion LEP of each LED package 21h has three striped light emitting portions LEP1 to LEP3 to achieve high luminance, and these light emitting portions LEP1 to LEP1. LEP3 is a light emitting unit that exhibits a nonuniform luminance distribution as a whole. Each light emission part LEP1-LEP3 respond | corresponds to the PN junction part of LED which is a semiconductor light-emitting device also called a solid light source, receives the supply of the electric current from the outside, and light-emits by a desired wavelength (in this case, wavelength of G light) To do. As described above, the light emitting portion LEP of the LED package 21h inherently has a nonuniform luminance distribution, and uniforming such a luminance distribution, that is, a light / dark pattern, makes the liquid crystal light valve 31 uniform. This is important for lighting.

  As shown in FIG. 2B, the light distribution adjusting member 21b is composed of six columnar polarization beam splitters PS. Each polarization beam splitter PS is a light branching optical element (prism member) having the same shape and structure, and extends in the Y direction (longitudinal direction) orthogonal to the optical axis perpendicular to the paper surface. Each polarization beam splitter PS is an irradiated region in which each incident surface is divided into six, and a polarization separation surface SS inclined in a predetermined direction within a plane including the optical axis and the X direction (short direction). Built in (see FIG. 1). These six polarizing beam splitters PS are joined in a state of being arranged without gaps in the X direction, and the incident S-polarized light can pass through as it is due to the presence of the polarization separation surface SS which is a semi-transmissive reflection surface. In addition, the incident P-polarized light is allowed to pass by being shifted in the X direction by a distance ΔX corresponding to the width of the polarizing beam splitter PS.

  As shown in FIG. 2C, image light from the light emitting portion LEP of the LED package 21h is projected onto the incident surface IS of the light distribution adjusting member 21b. At this time, although the light emitting portion LEP and the incident surface IS are not accurately arranged at the conjugate position, a luminance distribution corresponding to the light emitting portion LEP is formed on the incident surface IS, and the luminance is obtained by the three strip portions BZ. Increased state. Here, the arrangement period in the X direction of the three belt-like parts BZ is P, and this period P corresponds to the period of the light emitting portions LEP1 to LEP3 in the LED package 21h multiplied by the projection magnification. Yes. Further, the interval in the X direction between the pair of band-like parts BZ is Q, which is narrower than the width of the band-like part BZ. In the drawing, the three band-like parts BZ are expressed so as to be clearly distinguished from the surroundings, but actually, an image of a gentle luminance distribution is projected, and the outline of each band-like part BZ is illustrated. Not so clear.

  FIG. 3 is a plan view of the light distribution adjusting member 21b viewed from the Y direction. As is apparent from the figure, when the illumination light incident on the light distribution adjusting member 21b is S-polarized light, the illumination light passes through the polarization beam splitter PS constituting the light distribution adjusting member 21b as it is. On the other hand, when the illumination light incident on the light distribution adjustment member 21b is P-polarized light, the illumination light is reflected twice by the polarization separation surface SS provided in the polarization beam splitter PS when passing through the light distribution adjustment member 21b. Shift in the X direction by ΔX. That is, the S-polarized illumination light exits from the array of the polarization beam splitter PS without any positional deviation, and the P-polarization illumination light is displaced in the X direction by a width ΔX corresponding to one polarization beam splitter PS and is polarized light. Inject an array of splitters PS.

  FIG. 4 is a graph for explaining the role of the light distribution adjusting member 21b. The horizontal axis indicates the position in the X direction, and the vertical axis indicates the light intensity. In the graph, the solid line indicates the luminance distribution of the illumination light on the incident surface IS of the light distribution adjusting member 21b. The dotted line indicates S-polarized light that passes through the light distribution adjusting member 21b as it is, and the alternate long and short dash line indicates P-polarized light that is shifted by ΔX in the X direction when passing through the light distribution adjusting member 21b. When random polarized light is emitted from the LED package 21h, the intensity of S-polarized light incident on the light distribution adjusting member 21b and the intensity of P-polarized light incident on the light distribution adjusting member 21b are substantially equal. A broken line indicates a luminance distribution obtained by combining the S-polarized light and the P-polarized light that have passed through the array of polarization beam splitters PS provided on the light distribution adjusting member 21b, and the light distribution adjusting member 21b after passing through the first exit surface OS1. The luminance distribution of illumination light is shown. In addition, the luminance distribution of the illumination light after passing through the second exit surface OS2 of the light distribution adjusting member 21b only passes through the λ / 2 wavelength plate WP, and there is no particular change.

  As is clear from the above graph, the luminance distribution that appeared as a solid line when entering the light distribution adjusting member 21b is shown as a broken line as a result of division / combination when the light distribution adjusting member 21b is emitted. To be relatively smooth. By making such relatively uniform illumination light incident on the rod integrator 21c, the rod integrator 21c can be uniformly made uniform, and the illumination light emitted from the rod integrator 21c can be made extremely uniform. it can. As a result, despite the simple structure, the liquid crystal light valve 31 for G light can be illuminated very uniformly by the first illumination light IG having extremely uniform brightness. Alternatively, even if the rod integrator 21c shown in the figure is shortened to reduce the size, the same degree of uniformity as in the case where the rod integrator 21c is long and the light distribution adjusting member 21b is not present can be achieved.

Here, the relationship between the luminance distribution on the incident surface IS of the light distribution adjusting member 21b and the size and arrangement of the polarization beam splitter PS will be described. The shift amount ΔX of the P-polarized light when passing through the light distribution adjusting member 21b is set so that the interval Q between the band-like portions BZ shown in FIG. When the relationship of P is satisfied, it is desirable that the distance is equal to or greater than the interval Q of the belt-like portions BZ. On the other hand, the shift amount ΔP of the P-polarized light is obtained by subtracting the interval Q from the period P of the strip portion BZ shown in FIG. The following is desirable. When this relationship is expressed by a mathematical formula,
Q ≦ ΔX ≦ PQ (1)
It becomes. That is, by adjusting the width of each polarization beam splitter PS in the X direction so as to satisfy the above relational expression, it is possible to make the illumination light uniform by the light distribution adjusting member 21b efficient. In the actual light distribution adjusting member 21b, illumination satisfying the condition of Q ≦ (1/2) P is performed, and ΔX = (1/2) P.

For reference, if illumination satisfying the condition of Q> (1/2) P is performed instead of Q ≦ (1/2) P as described above,
P-Q ≦ ΔX ≦ Q (2)
The shift amount ΔX is set under these conditions.

  The light distribution adjusting member 21b described in FIG. 2B, FIG. 3, and the like is composed of six polarizing beam splitters PS, and the contour in the XY plane is made to coincide with the size of the incident surface of the rod integrator 21c. The contours of the five polarizing beam splitters PS except for the left end can be made to coincide with the dimensions of the entrance surface of the rod integrator 21c. In this case, the P-polarized light and the S-polarized light can be incident on the rod integrator 21c with the same amount of light. Conversely, a polarizing beam splitter may be added to the right end of the rod integrator 21c so that the outlines of the seven polarizing beam splitters PS are matched with the dimensions of the incident surface of the rod integrator 21c. Also in this case, not only the P-polarized light and the S-polarized light are incident on the rod integrator 21c with the same light amount, but also the illumination light is not lost.

  Although not shown in the drawing, a polarization conversion element that converts illumination light incident on the liquid crystal light valve 31 into polarized light in a specific direction may be disposed between the rod integrator 21c and the liquid crystal light valve 31. it can.

  Returning to FIG. 1, the B light illumination device 23 includes a light source device 23a, a light distribution adjusting member 23b, and a rod integrator 23c. Here, the light source device 23a includes a second light source unit 23f and a condenser lens array 23g. The former second light source unit 23f is obtained by mounting a plurality of LED packages 23h on a surface mount substrate 23i in a two-dimensional array, and each LED package 23h has a plurality of light emitting portions built therein. B light included in the category of green (B) among the primary colors is generated. The structures of the light distribution adjusting member 23b and the rod integrator 23c are the same as those of the light distribution adjusting member 21b and the rod integrator 21c provided in the G light illumination device 21. The second illumination light IB from the second light source device 23a is collected without waste by the condenser lens array 23g, passes through the light distribution adjusting member 23b and the rod integrator 23c, and is a liquid crystal for B light in the light modulation device 30. The light enters the light valve 33. At this time, preliminary uniformization of the second illumination light IB is performed by the light distribution adjusting member 23b, and final homogenization of the second illumination light IB is performed by the rod integrator 23c, so that the light is emitted from the rod integrator 23c. The illumination light can be made extremely uniform. As a result, the B light liquid crystal light valve 33 can be illuminated very uniformly by the second illumination light IB.

  Although not shown in the drawings, a polarization conversion element that converts illumination light incident on the liquid crystal light valve 33 into polarized light in a specific direction may be disposed between the rod integrator 23c and the liquid crystal light valve 33. it can.

  The R light illumination device 25 includes a light source device 25a, a light distribution adjusting member 25b, and a rod integrator 25c. Here, the light source device 25a includes a third light source unit 25f and a condenser lens array 25g. The former third light source unit 25f is obtained by mounting a plurality of LED packages 25h in a two-dimensional arrangement on a surface mounting substrate 25i, and each LED package 25h has a plurality of light emitting portions built therein. R light included in the category of green (R) among the primary colors is generated. The structures of the light distribution adjusting member 25b and the rod integrator 25c are the same as those of the light distribution adjusting member 21b and the rod integrator 21c provided in the G light illumination device 21. The third illumination light IR from the third light source device 25a is collected without waste by the condensing lens array 25g, passes through the light distribution adjusting member 25b and the rod integrator 25c, and is a liquid crystal for R light in the light modulation device 30. The light enters the light valve 35. At this time, preliminary homogenization of the third illumination light IR is performed by the light distribution adjusting member 25b, and final homogenization of the third illumination light IR is performed by the rod integrator 25c, so that the third illumination light IR is emitted from the rod integrator 25c. The illumination light can be made extremely uniform. As a result, the R light liquid crystal light valve 35 can be illuminated very uniformly by the third illumination light IR.

  Although not shown in the drawings, a polarization conversion element that converts illumination light incident on the liquid crystal light valve 35 into polarized light in a specific direction may be disposed between the rod integrator 25c and the liquid crystal light valve 35. it can.

  The light from each color light illuminating device 21, 23, 25 incident on each liquid crystal light valve 31, 33, 35 is two-dimensionally modulated by these liquid crystal light valves 31, 33, 35, respectively. The light of each color that has passed through the liquid crystal light valves 31, 33, and 35 is combined by the cross dichroic prism 37 and emitted from one side surface thereof. The combined light image emitted from the cross dichroic prism 37 is incident on the projection lens 40 which is a projection optical system, and is projected at a suitable magnification on a screen (not shown) disposed in front thereof. That is, the projector 10 projects an image obtained by combining the images of the colors G, B, and R formed on the liquid crystal light valves 31, 33, and 35 on the screen as a moving image or a still image. Although not shown, polarizing plates are arranged at appropriate positions around the liquid crystal light valves 31, 33, 35 in order to illuminate and read the liquid crystal light valves 31, 33, 35 with polarized light. ing.

  The control device 50 outputs a control signal to the light source driving device 27, and the LED packages 21h, 23h constituting the first to third light source devices 21a, 23a, 25a provided in the respective color light illumination devices 21, 23, 25. , 25h at appropriate timing. Further, the control device 50 outputs a control signal to the element driving device 38 to form a two-dimensional polarization characteristic distribution corresponding to the brightness of the projected image on each of the liquid crystal light valves 31, 33 and 35.

  The operation of the projector 10 shown in FIG. The illumination lights of the respective colors from the GBR light illumination devices 21, 23, and 25 provided in the illumination device 20 are sufficiently uniformed by the light distribution adjusting members 21b, 23b, and 25b and the rod integrators 21c, 23c, and 25c provided therein, respectively. In this state, the light enters the corresponding liquid crystal light valves 31, 33, and 35, respectively. Each of the liquid crystal light valves 31, 33, and 35 has a two-dimensional refractive index distribution modulated by an element driving device 38 that operates according to an image signal from the outside, and two-dimensional spatial distribution of illumination light of each color. Is modulated in units of pixels. As described above, the illumination light, that is, the image light modulated by the liquid crystal light valves 31, 33, and 35 is synthesized by the cross dichroic prism 37, enters the projection lens 40, and is projected onto a screen (not shown). Here, in this embodiment, since the light distribution adjusting members 21b, 23b, and 25b are provided to preliminarily equalize the illumination light, the liquid crystal light valves 31, 33, and 35 are connected to the LED packages 21h, 23h, and 25h, respectively. Regardless of the non-uniform luminance distribution of the light emitting part, it can be made extremely uniform. Accordingly, the liquid crystal light valves 31, 33, and 35 can be illuminated with a uniform and sufficient amount of illumination light, and a high-quality image can be formed on the screen.

[Second Embodiment]
Hereinafter, a projector according to a second embodiment of the invention will be described. Since the projector according to the second embodiment is a modification of the projector according to the first embodiment, a description of common parts is omitted, and only different parts will be described.

  FIG. 5 is a diagram for explaining an arrangement relationship or the like of the first light source unit 21f (see FIG. 1) in the projector according to the second embodiment. FIG. 5 (a) shows each of the first light source units 21f provided in the first light source unit 21f. FIG. 5B is a front view showing a light emitting portion LEP ′ of the LED package 121h, FIG. 5B is a rear view showing an incident side of the light distribution adjusting member 121b, and FIG. 5C is a diagram of the light distribution adjusting member 121b. It is a figure explaining the illumination state of the incident side.

  As shown in FIG. 5A, the light emitting portion LEP ′ of the LED package 121h is different from the case of the first embodiment in that it has three striped light emitting portions LEP1 to LEP3 inclined with respect to the X direction and the Y direction. have. As shown in FIG. 5B, the light distribution adjusting member 121b is composed of six polarizing beam splitters PS extending in the Y direction perpendicular to the optical axis perpendicular to the paper surface and having a width ΔX ′ with respect to the X direction. . As shown in FIG. 5C, image light from the light emitting portion LEP 'of the LED package 121h is projected onto the incident surface IS of the light distribution adjusting member 121b. In this case, since the light emitting part LEP 'of the LED package 121h is inclined so as to rotate as a whole, the three band-like parts BZ are also inclined and projected. As a result, the period in the X direction with respect to the three strip portions BZ is P ′, and the interval in the X direction with respect to the pair of strip portions BZ is Q ′.

Here, the shift amount ΔX ′ of the P-polarized light when passing through the light distribution adjusting member 121b is set such that the interval Q ′ of the band-like portions BZ shown in FIG. When satisfying the relationship of ≦ (1/2) P ′, it is desirable that the distance is equal to or greater than the interval Q ′ of the belt-like portions BZ. On the other hand, the shift amount ΔX ′ of the P-polarized light is obtained by subtracting the interval Q from the period P of the band-like portion BZ shown in FIG. 5C in order to prevent this from becoming excessive and preventing the uniformization of the illumination light. Or less. When this relationship is expressed by a mathematical formula,
Q ′ ≦ ΔX ′ ≦ P′−Q ′ (3)
It becomes. That is, by adjusting the width ΔX ′ in the X direction of the polarization beam splitter PS so as to satisfy the above relational expression, it is possible to make the illumination light uniform by the light distribution adjusting member 21b efficient.

  Although the present invention has been described based on the above embodiments, the present invention is not limited to the above embodiments. For example, in the said embodiment, although the LED package is used as a light emitting element which comprises the 1st-3rd light source devices 21a-25a, it can replace with this and can use an organic EL light emitting element, a laser diode, etc.

  In the above embodiment, the image light from the three liquid crystal light valves 31 to 35 individually illuminated with RGB colors is synthesized by the cross dichroic prism, but the color liquid crystal light valve is illuminated by the white light source. It goes without saying that the present invention can be applied to a type of projector. Also in this case, the illumination light can be easily made uniform by disposing the above-described light distribution adjusting member between the white light source having a luminance distribution and the rod integrator or the like.

  In the above embodiment, the light distribution adjusting member 21b is formed by the six polarizing beam splitters PS. However, the number of the polarizing beam splitters PS depends on the pattern of the light emitting portions of the LED packages 21h, 23h, and 25h. Can be changed as appropriate. Furthermore, the polarization beam splitter PS may be a prism member in which the polarization separation surface SS is replaced with a half mirror.

  The light modulation device 30 is not limited to a transmission type such as a liquid crystal light valve, but may be a reflection type. The object to which the image light from the projector 10 is projected can be a front projection type screen that projects an image from the front, but can also be a rear projection type screen that projects an image from the back.

  In the above embodiment, the liquid crystal light valves 31, 33, and 35 are used as the light modulation device. However, a digital mirror device (DMD) may be used instead of the liquid crystal light valves 31, 33, and 35.

It is a figure which shows the projector which concerns on 1st Embodiment. (A)-(c) is a figure explaining the arrangement | positioning relationship in G light illuminating device. It is the top view which looked at the light distribution adjustment member provided in the light illuminating device from the Y direction. It is a graph explaining the role of a light distribution adjustment member. (A)-(c) is a figure explaining the arrangement | positioning relationship of the light illuminating device of 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Projector, 20 ... Illuminating device, 21, 23, 25 ... Each color light illuminating device, 21a-25a ... Light source device, 21b-25b ... Light distribution adjustment member, 21c-25c ... Rod integrator, 21f-25f ... Light source unit, 21g to 25f ... Condensing lens array, 21h to 25h ... LED package, 31, 33, 35 ... Liquid crystal light valve, 37 ... Cross dichroic prism, 38 ... Element driving device, 40 ... Projection lens, 50 ... Control device, IG ... 1st illumination light, IB ... 2nd illumination light, IR ... 3rd illumination light, IS ... Incident surface, LEP ... Light emission part, LEP1-LEP3 ... Light emission part, PS ... Polarizing beam splitter

Claims (9)

A light source device having a light emitting unit exhibiting a non-uniform luminance distribution;
A light modulator that modulates illumination light from the light emitting unit to form image light;
With respect to incident light that is illumination light from the light source device that is disposed between the light source device and the light modulation device and is incident on a plurality of irradiated regions provided on the incident side, to the plurality of irradiated regions And a light distribution adjusting means for mitigating the non-uniform luminance distribution of the light emitting part by performing a partial transition between the respective incident lights after the incident light.   The light distribution adjusting unit partially divides incident light incident on one of the plurality of irradiated regions using a reflection phenomenon, and passes through another irradiated region adjacent to the one irradiated region. The projector according to claim 1, wherein the projector is emitted together with the light to be emitted.   The light emitting unit includes light emitting units arranged at predetermined intervals in a predetermined direction perpendicular to the optical axis, and the light source device receives light and dark patterns corresponding to the plurality of irradiated regions as incident light distribution adjusting means. The projector according to claim 1, wherein the projector is formed on a surface.   4. The projector according to claim 1, wherein the light distribution adjusting unit includes a plurality of optical elements for branching light corresponding to each of the plurality of irradiation areas. 5. .   5. The projector according to claim 4, wherein each of the light branching optical elements is a prism member that has a semi-transmissive reflective surface and divides and combines incident light through the reflective surface.   Each prism member is a polarization beam splitter having a polarization separation surface inclined with respect to the optical axis, and extends in a short direction as a longitudinal direction extending in a direction perpendicular to the optical axis and perpendicular to the inclination direction of the polarization separation surface. 6. The projector according to claim 5, wherein the projectors are arranged and joined.   The projector according to any one of claims 1 to 6, wherein the light source device is a semiconductor light source device in which a plurality of semiconductor light emitting elements are packaged and integrated as the light emitting unit.   The projector according to any one of claims 1 to 7, further comprising a light uniformizing unit between the light distribution adjusting unit and the light modulation device.   9. The projector according to claim 8, wherein the light uniformizing means is a rod integrator.

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