JP2010256558A - Projection type video display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection type video display, thoroughly preventing dew condensation in each of a plurality of solid light sources. <P>SOLUTION: This projection type video display 100 includes the plurality of solid light sources 111, a DMD 500 for modulating light emitted from the plurality of solid light sources, and a projection unit 150 for projecting the light emitted from the DMD 500 on a projection surface. The projection type video display 100 includes one cooling unit 130 for cooling the plurality of solid light sources 111, a light source control part 640 for controlling the quantity of light emitted from each of the plurality of solid light sources 111, and a calculating part 620 for calculating the dew condensation conditions of the plurality of solid light sources at least based on the ambient temperature of each of the plurality of solid light sources. The light source control part 640 controls the quantity of light emitted from each of the plurality of solid light sources 111 based on the dew condensation conditions calculated by the calculating part 620. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a projection-type image comprising a plurality of solid-state light sources, a light modulation element that modulates light emitted from the plurality of solid-state light sources, and a projection unit that projects light emitted from the light modulation elements onto a projection plane. The present invention relates to a display device.

  2. Description of the Related Art Conventionally, there has been known a projection display apparatus having a solid light source, a light modulation element that modulates light emitted from the solid light source, and a projection unit that projects light emitted from the light modulation element onto a projection surface. Yes.

  Here, when dew condensation occurs on the solid light source (particularly, the light exit surface), the image projected on the projection surface deteriorates. In addition, the solid light source deteriorates.

  On the other hand, a technique for detecting condensation of a solid light source has been proposed (for example, Patent Document 1). Specifically, prior to the start of using the light emitted from the solid light source, the amount of light emitted from the solid light source is monitored over a predetermined period. Here, when the light amounts in the predetermined period are substantially equal, it is determined that no condensation of the solid light source occurs. On the other hand, when the amount of light in the predetermined period changes (decreases), it is determined that condensation of the solid light source occurs.

JP 2003-273445 A

  By the way, since the solid light source generates heat as light is emitted from the solid light source, it is preferable that a cooling device for cooling the solid light source is provided in the projection display apparatus. In addition, the projection display apparatus has a plurality of solid light sources in order to secure a necessary light amount, and it is assumed that the plurality of solid light sources are cooled by one cooling device.

  In such a case, when light emitted from a plurality of solid light sources is used, if the amount of light emitted from the solid light sources is changed, at least one of the plurality of solid light sources is condensed. It is conceivable that the condition is satisfied. In particular, when light emitted from a plurality of solid light sources is used, it is conceivable that at least one solid light source satisfies the dew condensation condition when the amount of light emitted from the solid light sources is reduced.

  In the above-described technique, the condensation of the solid light sources is detected based on the change in the amount of light emitted from the solid light sources, and therefore the respective condensations of the plurality of solid light sources cannot be sufficiently avoided.

  Accordingly, the present invention has been made to solve the above-described problem, and an object thereof is to provide a projection display apparatus that can sufficiently avoid the condensation of each of a plurality of solid-state light sources. .

  A projection display apparatus according to a first feature includes a plurality of solid light sources (red solid light source 111R, green solid light source 111G, blue solid light source 111B) and light modulation that modulates light emitted from the plurality of solid light sources. An element (DMD500R, DMD500G, DMD500B) and a projection unit (projection unit 150) for projecting light emitted from the light modulation element onto a projection surface are provided. The projection display apparatus includes one cooling device (cooling unit 130) that cools the plurality of solid light sources, and a light source control unit (light source control unit 640) that controls the amount of light emitted from each of the plurality of solid light sources. And a calculation unit (calculation unit 620) that calculates condensation conditions of the plurality of solid light sources based on at least ambient temperatures of the plurality of solid light sources. The light source control unit controls the amount of light emitted from each of the plurality of solid state light sources based on the dew condensation condition calculated by the calculation unit.

  In the first feature, the projection display apparatus further includes a cooling device control unit (cooling unit control unit 650) that controls the cooling power of the one cooling device. The cooling device control unit controls the cooling power of the one cooling device based on the dew condensation condition calculated by the calculation unit.

  In the first feature, the projection display apparatus includes an element control unit (element control unit 630) that controls the light modulation element based on a video input signal, and the plurality of solids based on the video input signal. A backlight pre-processing unit (backlight pre-processing unit 660) that calculates a target light amount of light emitted from the light source is further provided. The backlight preprocessing unit sets a minimum value of the amount of light emitted from each of the plurality of solid state light sources based on the dew condensation condition calculated by the calculation unit. The light source control unit controls the amount of light emitted from the plurality of solid light sources to the target amount of light so that the amount of light emitted from each of the plurality of solid light sources does not fall below the minimum value.

  1st characteristic WHEREIN: The said calculation part calculates each dew condensation condition of these solid light sources based on each position of these solid light sources.

  ADVANTAGE OF THE INVENTION According to this invention, the projection type video display apparatus which makes it possible to fully avoid each condensation of a some solid light source can be provided.

1 is a perspective view showing a projection display apparatus 100 according to a first embodiment. It is the figure which looked at the projection type video display apparatus 100 concerning a 1st embodiment from the side. It is the figure which looked at the projection type video display apparatus 100 concerning a 1st embodiment from the upper part. It is a figure which shows the light source unit 110 which concerns on 1st Embodiment. FIG. 3 is a diagram illustrating a color separation / synthesis unit 140 and a projection unit 150 according to the first embodiment. It is a figure which shows the control unit 600 which concerns on 1st Embodiment. It is a figure which shows the saturated water vapor quantity which concerns on 1st Embodiment. It is a figure which shows the backlight control process which concerns on 1st Embodiment. It is a figure which shows the backlight control process which concerns on 1st Embodiment. It is a figure which shows the backlight control process which concerns on 1st Embodiment. It is a figure which shows arrangement | positioning of the solid light source 111 which concerns on the example 1 of a change. It is a figure which shows the control unit 600 which concerns on the example 1 of a change. It is a figure which shows control of the emitted light quantity which concerns on the example 1 of a change. It is a figure which shows control of the emitted light quantity which concerns on the example 1 of a change. It is a figure which shows control of the emitted light quantity which concerns on the example 1 of a change. It is a figure which shows control of the emitted light quantity which concerns on the example 1 of a change.

  Hereinafter, a projection display apparatus according to an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

  However, it should be noted that the drawings are schematic and ratios of dimensions are different from actual ones. Therefore, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

[Outline of Embodiment]
A projection display apparatus according to an embodiment includes a plurality of solid-state light sources, a light modulation element that modulates light emitted from the plurality of solid-state light sources, and a projection that projects light emitted from the light modulation element onto a projection surface. A unit. The projection display apparatus is based on one cooling device that cools a plurality of solid light sources, a light source control unit that controls the amount of light emitted from each of the plurality of solid light sources, and at least the ambient temperature of the plurality of solid light sources. A calculation unit that calculates the dew condensation conditions of the plurality of solid state light sources. The light source control unit controls the amount of light emitted from each of the plurality of solid light sources based on the dew condensation condition calculated by the calculation unit.

  In the embodiment, the light source control unit controls the amount of light emitted from each of the plurality of solid light sources based on the dew condensation condition calculated based on the ambient temperature of at least the plurality of solid light sources. Therefore, the condensation of each of the plurality of solid state light sources can be sufficiently avoided.

[First Embodiment]
(Configuration of projection display device)
Hereinafter, the configuration of the projection display apparatus according to the first embodiment will be described with reference to the drawings. FIG. 1 is a perspective view showing a projection display apparatus 100 according to the first embodiment. FIG. 2 is a side view of the projection display apparatus 100 according to the first embodiment.

  As shown in FIGS. 1 and 2, the projection display apparatus 100 has a housing 200 and projects an image on a projection plane 300. The projection display apparatus 100 is arranged along a first arrangement surface (wall surface 420 shown in FIG. 2) and a second arrangement surface (floor surface 410 shown in FIG. 2) substantially perpendicular to the first arrangement surface.

  Here, in the first embodiment, a case in which the projection display apparatus 100 projects image light onto a projection plane 300 provided on a wall surface is illustrated (wall surface projection). The arrangement of the casing 200 in such a case is referred to as a wall surface projection arrangement. In the first embodiment, the first arrangement surface substantially parallel to the projection surface 300 is the wall surface 420.

  In the first embodiment, a horizontal direction parallel to the projection plane 300 is referred to as a “width direction”. The normal direction of the projection plane 300 is referred to as “depth direction”. A direction orthogonal to both the width direction and the depth direction is referred to as a “height direction”.

  The housing 200 has a substantially rectangular parallelepiped shape. The size of the housing 200 in the depth direction and the size of the housing 200 in the height direction are smaller than the size of the housing 200 in the width direction. The size of the casing 200 in the depth direction is substantially equal to the projection distance from the reflection mirror (concave mirror 152 shown in FIG. 2) to the projection plane 300. In the width direction, the size of the casing 200 is substantially equal to the size of the projection plane 300. In the height direction, the size of the housing 200 is determined according to the position where the projection plane 300 is provided.

  Specifically, the housing 200 includes a projection surface side wall 210, a front surface side wall 220, a bottom plate 230, a top plate 240, a first side surface side wall 250, and a second side surface side wall 260. .

  The projection surface side wall 210 is a plate-like member that faces a first arrangement surface (in the first embodiment, a wall surface 420) substantially parallel to the projection surface 300. The front side wall 220 is a plate-like member provided on the opposite side of the projection plane side wall 210. The bottom plate 230 is a plate-like member that faces a second arrangement surface (in the first embodiment, the floor surface 410) other than the first arrangement surface that is substantially parallel to the projection plane 300. The top plate 240 is a plate-like member provided on the opposite side of the bottom plate 230. The first side wall 250 and the second side wall 260 are plate-like members that form both ends of the housing 200 in the width direction.

  The housing 200 accommodates the light source unit 110, the power supply unit 120, the cooling unit 130, the color separation / combination unit 140, and the projection unit 150. The projection surface side sidewall 210 has a projection surface side recess 160A and a projection surface side recess 160B. The front side wall 220 has a front side convex portion 170. The top plate 240 has a top plate recess 180. The first side wall 250 has a cable terminal 190.

  The light source unit 110 is a unit composed of a plurality of solid light sources (solid light sources 111 shown in FIG. 4). Each solid light source is a light source such as an LD (Laser Diode). In the first embodiment, the light source unit 110 includes a red solid light source (red solid light source 111R shown in FIG. 4) that emits red component light R and a green solid light source (green solid shown in FIG. 4) that emits green component light G. Light source 111G) and a blue solid light source that emits blue component light B (blue solid light source 111B shown in FIG. 4). Details of the light source unit 110 will be described later (see FIG. 4).

  The power supply unit 120 is a unit that supplies power to the projection display apparatus 100. For example, the power supply unit 120 supplies power to the light source unit 110 and the cooling unit 130.

  The cooling unit 130 is a unit that cools a plurality of solid state light sources provided in the light source unit 110. Specifically, the cooling unit 130 cools each solid light source by cooling a cooling jacket (cooling jacket 131 shown in FIG. 4) on which each solid light source is placed.

  The cooling unit 130 is configured to cool the power supply unit 120 and the light modulation element (DMD 500 described later) in addition to the solid light sources.

  The color separation / combination unit 140 combines the red component light R emitted from the red solid light source, the green component light G emitted from the green solid light source, and the blue component light B emitted from the blue solid light source. The color separation / combination unit 140 separates the combined light including the red component light R, the green component light G, and the blue component light B, and modulates the red component light R, the green component light G, and the blue component light B. Further, the color separation / combination unit 140 recombines the red component light R, the green component light G, and the blue component light B, and emits image light to the projection unit 150. Details of the color separation / synthesis unit 140 will be described later (see FIG. 5).

  The projection unit 150 projects the light (image light) emitted from the color separation / synthesis unit 140 onto the projection plane 300. Specifically, the projection unit 150 projects the light emitted from the color separation / synthesis unit 140 onto the projection plane 300 (projection lens group 151 shown in FIG. 5) and the projection lens group. A reflecting mirror (concave mirror 152 shown in FIG. 5) that reflects light toward the projection surface 300; Details of the projection unit 150 will be described later.

  The projection surface side recess 160 </ b> A and the projection surface side recess 160 </ b> B are provided on the projection surface side wall 210 and have a shape that is recessed inside the housing 200. The projection surface side recess 160 </ b> A and the projection surface side recess 160 </ b> B extend to the end of the housing 200. The projection surface side recess 160 </ b> A and the projection surface side recess 160 </ b> B are provided with vent holes that communicate with the inside of the housing 200.

  In the first embodiment, the projection surface side recess 160 </ b> A and the projection surface side recess 160 </ b> B extend along the width direction of the housing 200. For example, the projection surface side recess 160 </ b> A is provided with an air inlet for allowing air outside the housing 200 to enter the housing 200 as a vent. The projection surface side recess 160 </ b> B is provided with an exhaust port for venting air inside the housing 200 to the outside of the housing 200 as a vent.

  The front-side convex portion 170 is provided on the front-side side wall 220 and has a shape protruding to the outside of the housing 200. The front side convex portion 170 is provided at the approximate center of the front side wall 220 in the width direction of the housing 200. A reflection mirror (concave mirror 152 shown in FIG. 5) provided in the projection unit 150 is accommodated in a space formed by the front-side convex portion 170 inside the housing 200.

  The top plate recess 180 is provided in the top plate 240 and has a shape that is recessed inside the housing 200. The top plate recess 180 has an inclined surface 181 that goes down toward the projection plane 300 side. The inclined surface 181 has a transmission region that transmits (projects) the light emitted from the projection unit 150 to the projection surface 300 side.

  The cable terminal 190 is provided on the first side wall 250 and is a terminal such as a power terminal or a video terminal. The cable terminal 190 may be provided on the second side wall 260.

(Arrangement of units in the width direction of the housing)
Below, arrangement | positioning of each unit in the width direction which concerns on 1st Embodiment is demonstrated, referring drawings. FIG. 3 is a view of the projection display apparatus 100 according to the first embodiment as viewed from above.

  As shown in FIG. 3, the projection unit 150 is disposed in the approximate center of the casing 200 in the horizontal direction (width direction of the casing 200) parallel to the projection plane 300.

  The light source unit 110 and the cooling unit 130 are arranged side by side with the projection unit 150 in the width direction of the housing 200. Specifically, the light source unit 110 is arranged side by side on the one side (second side wall 260 side) of the projection unit 150 in the width direction of the casing 200. The cooling unit 130 is arranged side by side on the other side (first side wall 250 side) of the projection unit 150 in the width direction of the casing 200.

  The power supply unit 120 is arranged side by side with the projection unit 150 in the width direction of the housing 200. Specifically, the power supply unit 120 is arranged side by side on the light source unit 110 side with respect to the projection unit 150 in the width direction of the casing 200. The power supply unit 120 is preferably disposed between the projection unit 150 and the light source unit 110.

(Configuration of light source unit)
Hereinafter, the configuration of the light source unit according to the first embodiment will be described with reference to the drawings. FIG. 4 is a diagram illustrating the light source unit 110 according to the first embodiment.

  As shown in FIG. 4, the light source unit 110 includes a plurality of red solid light sources 111R, a plurality of green solid light sources 111G, and a plurality of blue solid light sources 111B.

  As described above, the red solid light source 111R is a red solid light source such as an LD that emits the red component light R. The red solid light source 111R has a head 112R, and an optical fiber 113R is connected to the head 112R.

  The optical fibers 113R connected to the head 112R of each red solid light source 111R are bundled by the bundle portion 114R. That is, the light emitted from each red solid light source 111R is transmitted by each optical fiber 113R and collected in the bundle portion 114R.

  The red solid light source 111R is placed on the cooling jacket 131R. For example, the red solid light source 111R is fixed to the cooling jacket 131R by screwing or the like. The red solid light source 111R is cooled by the cooling jacket 131R.

  As described above, the green solid light source 111G is a green solid light source such as an LD that emits the green component light G. The green solid light source 111G has a head 112G, and an optical fiber 113G is connected to the head 112G.

  The optical fibers 113G connected to the head 112G of each green solid light source 111G are bundled by a bundle unit 114G. That is, the light emitted from each green solid light source 111G is transmitted by each optical fiber 113G and collected in the bundle portion 114G.

  The green solid light source 111G is placed on the cooling jacket 131G. For example, the green solid light source 111G is fixed to the cooling jacket 131G by screwing or the like. The green solid light source 111G is cooled by the cooling jacket 131G.

  As described above, the blue solid light source 111B is a blue solid light source such as an LD that emits the blue component light B. The blue solid light source 111B has a head 112B, and an optical fiber 113B is connected to the head 112B.

  The optical fibers 113B connected to the heads 112B of the blue solid light sources 111B are bundled by the bundle unit 114B. That is, the light emitted from each blue solid light source 111B is transmitted by each optical fiber 113B and collected in the bundle portion 114B.

  The blue solid light source 111B is placed on the cooling jacket 131B. For example, the blue solid light source 111B is fixed to the cooling jacket 131B by screwing or the like. The blue solid light source 111B is cooled by the cooling jacket 131B.

(Configuration of color separation / synthesis unit and projection unit)
The configurations of the color separation / synthesis unit and the projection unit according to the first embodiment will be described below with reference to the drawings. FIG. 5 is a diagram illustrating the color separation / synthesis unit 140 and the projection unit 150 according to the first embodiment. The first embodiment exemplifies a projection display apparatus 100 that supports a DLP (Digital Light Processing) method (registered trademark).

  As illustrated in FIG. 5, the color separation / synthesis unit 140 includes a first unit 141 and a second unit 142.

  The first unit 141 combines the red component light R, the green component light G, and the blue component light B, and outputs the combined light including the red component light R, the green component light G, and the blue component light B to the second unit 142. To do.

  Specifically, the first unit 141 includes a plurality of rod integrators (rod integrator 10R, rod integrator 10G and rod integrator 10B), a lens group (lens 21R, lens 21G, lens 21B, lens 22, lens 23), And a mirror group (mirror 31, mirror 32, mirror 33, mirror 34, and mirror 35).

  The rod integrator 10R has a light incident surface, a light emitting surface, and a light reflecting side surface provided from the outer periphery of the light incident surface to the outer periphery of the light emitting surface. The rod integrator 10R makes the red component light R emitted from the optical fiber 113R bundled by the bundle portion 114R uniform. In other words, the rod integrator 10R makes the red component light R uniform by reflecting the red component light R on the light reflection side surface.

  The rod integrator 10G has a light incident surface, a light emitting surface, and a light reflecting side surface provided from the outer periphery of the light incident surface to the outer periphery of the light emitting surface. The rod integrator 10G uniformizes the green component light G emitted from the optical fiber 113G bundled by the bundle unit 114G. That is, the rod integrator 10G makes the green component light G uniform by reflecting the green component light G on the light reflection side surface.

  The rod integrator 10B has a light incident surface, a light emitting surface, and a light reflecting side surface provided from the outer periphery of the light incident surface to the outer periphery of the light emitting surface. The rod integrator 10B makes the blue component light B emitted from the optical fiber 113B bundled by the bundle part 114B uniform. That is, the rod integrator 10B makes the blue component light B uniform by reflecting the blue component light B on the light reflection side surface.

  Note that the rod integrator 10R, the rod integrator 10G, and the rod integrator 10B may be hollow rods whose light-reflecting side surfaces are configured by mirror surfaces. Further, the rod integrator 10R, the rod integrator 10G, and the rod integrator 10B may be solid rods made of glass or the like.

  Here, the rod integrator 10 </ b> R, the rod integrator 10 </ b> G, and the rod integrator 10 </ b> B have a columnar shape extending along a horizontal direction (width direction of the housing 200) substantially parallel to the projection plane 300. That is, the rod integrator 10 </ b> R is arranged so that the longitudinal direction of the rod integrator 10 </ b> R is along the substantially width direction of the housing 200. Similarly, the rod integrator 10G and the rod integrator 10B are arranged such that the longitudinal direction of the rod integrator 10G and the rod integrator 10B is along the substantially width direction of the housing 200.

  The lens 21R is a lens that collimates the red component light R so that the red component light R is irradiated onto the DMD 500R. The lens 21G is a lens that collimates the green component light G so that the green component light G is irradiated onto the DMD 500G. The lens 21B is a lens that collimates the blue component light B so that the blue component light B is applied to the DMD 500B.

  The lens 22 is a lens for substantially imaging the red component light R and the green component light G on the DMD 500R and DMD 500G while suppressing the expansion of the red component light R and the green component light G. The lens 23 is a lens for substantially imaging the blue component light B on the DMD 500B while suppressing the expansion of the blue component light B.

  The mirror 31 reflects the red component light R emitted from the rod integrator 10R. The mirror 32 is a dichroic mirror that reflects the green component light G emitted from the rod integrator 10G and transmits the red component light R. The mirror 33 is a dichroic mirror that transmits the blue component light B emitted from the rod integrator 10B and reflects the red component light R and the green component light G.

  The mirror 34 reflects the red component light R, the green component light G, and the blue component light B. The mirror 35 reflects the red component light R, the green component light G, and the blue component light B to the second unit 142 side. In FIG. 5, each component is shown in a plan view for the sake of simplicity. However, the mirror 35 obliquely reflects the red component light R, the green component light G, and the blue component light B in the height direction. Reflect on.

  The second unit 142 separates the combined light including the red component light R, the green component light G, and the blue component light B, and modulates the red component light R, the green component light G, and the blue component light B. Subsequently, the second unit 142 recombines the red component light R, the green component light G, and the blue component light B, and emits image light to the projection unit 150 side.

  Specifically, the second unit 142 includes a lens 40, a prism 50, a prism 60, a prism 70, a prism 80, a prism 90, and a plurality of DMDs; Digital Micromirror Device (DMD500R, DMD500G, and DMD500B). Have

  The lens 40 is a lens that collimates the light emitted from the first unit 141 so that each color component light is irradiated to each DMD.

  The prism 50 is made of a translucent member and has a surface 51 and a surface 52. An air gap is provided between the prism 50 (surface 51) and the prism 60 (surface 61), and the angle (incident angle) at which the light emitted from the first unit 141 enters the surface 51 is the total reflection angle. Therefore, the light emitted from the first unit 141 is reflected by the surface 51. On the other hand, an air gap is provided between the prism 50 (surface 52) and the prism 70 (surface 71), but the angle at which the light emitted from the first unit 141 enters the surface 52 (incident angle) is all. Since it is smaller than the reflection angle, the light reflected by the surface 51 passes through the surface 52.

  The prism 60 is made of a translucent member and has a surface 61.

  The prism 70 is made of a translucent member and has a surface 71 and a surface 72. An air gap is provided between the prism 50 (surface 52) and the prism 70 (surface 71), and the blue component light B reflected by the surface 72 and the blue component light B emitted from the DMD 500B are formed on the surface 71. Since the incident angle (incident angle) is larger than the total reflection angle, the blue component light B reflected by the surface 72 and the blue component light B emitted from the DMD 500B are reflected by the surface 71.

  The surface 72 is a dichroic mirror surface that transmits the red component light R and the green component light G and reflects the blue component light B. Accordingly, among the light reflected by the surface 51, the red component light R and the green component light G are transmitted through the surface 72, and the blue component light B is reflected by the surface 72. The blue component light B reflected by the surface 71 is reflected by the surface 72.

  The prism 80 is made of a translucent member and has a surface 81 and a surface 82. An air gap is provided between the prism 70 (surface 72) and the prism 80 (surface 81). The red component light R transmitted through the surface 81 and reflected by the surface 82 and the red component emitted from the DMD 500R. Since the angle (incident angle) at which the light R again enters the surface 81 is larger than the total reflection angle, the red component light R transmitted through the surface 81 and reflected by the surface 82 and the red component light R emitted from the DMD 500R are Reflected by the surface 81. On the other hand, since the angle (incident angle) at which the red component light R emitted from the DMD 500R and reflected by the surface 81 and then reflected by the surface 82 is incident on the surface 81 again is smaller than the total reflection angle, it is emitted from the DMD 500R. Then, the red component light R reflected by the surface 82 after being reflected by the surface 81 passes through the surface 81.

  The surface 82 is a dichroic mirror surface that transmits the green component light G and reflects the red component light R. Accordingly, among the light transmitted through the surface 81, the green component light G is transmitted through the surface 82, and the red component light R is reflected by the surface 82. The red component light R reflected by the surface 81 is reflected by the surface 82. The green component light G emitted from the DMD 500G passes through the surface 82.

  Here, the prism 70 separates the combined light including the red component light R and the green component light G and the blue component light B by the surface 72. The prism 80 separates the red component light R and the green component light G by the surface 82. That is, the prism 70 and the prism 80 function as a color separation element that separates each color component light.

  In the first embodiment, the cutoff wavelength of the surface 72 of the prism 70 is provided between a wavelength band corresponding to green and a wavelength band corresponding to blue. The cut-off wavelength of the surface 82 of the prism 80 is provided between a wavelength band corresponding to red and a wavelength band corresponding to green.

  On the other hand, the prism 70 combines the combined light including the red component light R and the green component light G and the blue component light B with the surface 72. The prism 80 combines the red component light R and the green component light G with the surface 82. That is, the prism 70 and the prism 80 function as a color composition element that synthesizes each color component light.

  The prism 90 is made of a translucent member and has a surface 91. The surface 91 is configured to transmit the green component light G. The green component light G incident on the DMD 500G and the green component light G emitted from the DMD 500G pass through the surface 91.

  DMD500R, DMD500G, and DMD500B are configured by a plurality of micromirrors, and the plurality of micromirrors are movable. Each minute mirror basically corresponds to one pixel. The DMD 500R switches whether to reflect the red component light R toward the projection unit 150 by changing the angle of each micromirror. Similarly, the DMD 500G and the DMD 500B switch whether to reflect the green component light G and the blue component light B toward the projection unit 150 by changing the angle of each micromirror.

  The projection unit 150 includes a projection lens group 151 and a concave mirror 152.

  The projection lens group 151 emits light (image light) emitted from the color separation / combination unit 140 to the concave mirror 152 side.

  The concave mirror 152 reflects light (image light) emitted from the projection lens group 151. The concave mirror 152 condenses the image light and then widens the image light. For example, the concave mirror 152 is an aspherical mirror having a concave surface on the projection lens group 151 side.

  The image light collected by the concave mirror 152 passes through a transmission region provided on the inclined surface 181 of the top plate recess 180 provided on the top plate 240. The transmission region provided on the inclined surface 181 is preferably provided in the vicinity of the position where the image light is collected by the concave mirror 152.

  As described above, the concave mirror 152 is accommodated in the space formed by the front side convex portion 170. For example, the concave mirror 152 is preferably fixed inside the front side convex portion 170. In addition, the shape of the inner surface of the front side convex portion 170 is preferably a shape along the concave mirror 152.

(Configuration of control unit)
The control unit according to the first embodiment will be described below with reference to the drawings. FIG. 6 is a block diagram showing the control unit 600 according to the first embodiment. The control unit 600 is provided in the projection display apparatus 100 and controls the projection display apparatus 100.

Here, the control unit 600 converts the video input signal into a video output signal and outputs the video output signal. The video input signal is a signal for each frame and includes a red input signal R _in , a green input signal G _in and a blue input signal B _in . The video output signal is a signal for each frame, and includes a red output signal _Rout , a green output signal _Gout, and a blue output signal _Bout .

  As shown in FIG. 6, the control unit 600 includes a video signal reception unit 610, a calculation unit 620, an element control unit 630, a light source control unit 640, and a cooling unit control unit 650.

  The video signal receiving unit 610 receives a video input signal from an external device (not shown) such as a DVD or a TV tuner.

  The calculation unit 620 calculates the condensation conditions of the plurality of solid light sources 111 based on at least the ambient temperature of the plurality of solid light sources 111. The condensation condition is a condition where condensation occurs. Specifically, the dew condensation condition is a condition indicating the temperature of the solid light source 111 (dew point temperature). When the temperature of the solid light source 111 satisfies the dew condensation condition, the surface of the solid light source 111 (for example, the light emission of the head 112). Condensation occurs on the surface.

  Here, in the first embodiment, the calculation unit 620 is connected to the temperature sensor 710 and the humidity sensor 720. The temperature sensor 710 detects the ambient temperature of the plurality of solid light sources 111, and the calculation unit 620 acquires the ambient temperature of the plurality of solid light sources 111 from the temperature sensor 710. The humidity sensor 720 detects the ambient humidity of the plurality of solid light sources 111, and the calculation unit 620 acquires the ambient humidity of the plurality of solid light sources 111 from the humidity sensor 720.

First, the calculation unit 620 specifies a saturated water vapor amount based on the ambient temperature and ambient humidity detected by the temperature sensor 710 and the humidity sensor 720. As shown in FIG. 7, it goes without saying that the saturated water vapor amount can be specified based on the ambient temperature and ambient humidity. In FIG. 7, the ambient humidity is represented by the amount of water vapor (gm ³ ).

  Second, the calculation unit 620 calculates the dew condensation conditions of the plurality of solid light sources 111 based on the specified saturated water vapor amount. As described above, the dew condensation condition is a condition in which dew condensation occurs, and is a condition indicating the temperature of the solid light source 111 (dew point temperature).

  For example, when the temperature of the solid light source 111 is lower than the ambient temperature of the solid light source 111 and the temperature of the solid light source 111 is lower than the dew point temperature, dew condensation occurs on the surface of the solid light source 111 (for example, the light emitting surface of the head 112). Arise.

  In the first embodiment, it should be noted that the calculation unit 620 calculates one dew condensation condition common to the plurality of solid light sources 111.

  The element control unit 630 controls the DMD 500 based on the video input signal. Specifically, the element control unit 630 controls the DMD 500 based on the video output signal obtained by converting the video input signal.

  The light source control unit 640 controls the amount of light emitted from each of the plurality of solid state light sources 111 provided in the light source unit 110. Specifically, the light source control unit 640 controls the amount of light emitted from each of the plurality of solid light sources 111 so that the dew condensation condition calculated by the calculation unit 620 is not satisfied. That is, the light source controller 640 controls the amount of light emitted from each of the plurality of solid light sources 111 so that the temperature of each solid light source 111 does not fall below the dew point temperature.

  The cooling unit controller 650 controls the cooling power of the cooling unit 130. Specifically, the light source control unit 640 controls the cooling power of the cooling unit 130 so that the dew condensation condition calculated by the calculation unit 620 is not satisfied. That is, the light source control unit 640 controls the cooling power of the cooling unit 130 so that the temperature of each solid light source 111 does not fall below the dew point temperature.

  Here, both the amount of light emitted from each of the plurality of solid light sources 111 and the cooling power of the cooling unit 130 may be controlled so that the temperature of each solid light source 111 does not fall below the dew point temperature. Further, only the amount of light emitted from each of the plurality of solid light sources 111 may be controlled so that the temperature of each solid light source 111 does not fall below the dew point temperature. For example, in the case where the cooling unit 130 is not provided, control is performed such that the temperature of each solid light source 111 does not fall below the dew point temperature only by controlling the amount of light emitted from each of the plurality of solid light sources 111.

(Function and effect)
In the first embodiment, the light source control unit 640 controls the amount of light emitted from each of the plurality of solid light sources 111 based on at least the dew condensation condition calculated based on the ambient temperature of the plurality of solid light sources 111. Therefore, the condensation of each of the plurality of solid light sources 111 can be sufficiently avoided.

  Similarly, in the first embodiment, the cooling unit control unit 650 controls the cooling power of the cooling unit 130 based on the dew condensation condition calculated based on at least the ambient temperature of the plurality of solid light sources 111. Therefore, the condensation of each of the plurality of solid light sources 111 can be sufficiently avoided.

  In the first embodiment, the calculation unit 620 specifies the saturated water vapor amount based on the ambient temperature and the ambient humidity detected by the temperature sensor 710 and the humidity sensor 720, and the condensation condition (dew point temperature) based on the saturated water vapor amount. Is calculated. Therefore, sufficient accuracy can be obtained in the calculation of the dew condensation condition (dew point temperature).

[Modification 1]
Hereinafter, Modification Example 1 of the first embodiment will be described with reference to the drawings. In the following, differences from the first embodiment will be described.

  Specifically, in the first modification, the projection display apparatus 100 performs a backlight control process for controlling the light amount emitted from the plurality of solid light sources 111 to the target light amount. Here, the projection display apparatus 100 sets a minimum value of the amount of light emitted from each of the plurality of solid-state light sources 111 based on the dew condensation condition.

(Backlight control processing)
Hereinafter, an example of the backlight control process will be described with reference to FIGS. The backlight control process is a process for controlling the amount of light emitted from the light source unit 110 based on the signal value of the video input signal (for example, an index indicating brightness). The backlight control process is a process for converting a video input signal into a video output signal in accordance with a control amount of the amount of light emitted from the light source unit 110. Here, it should be noted that the backlight control process is performed for each color of red, green, and blue.

The video input signal includes a red input signal R _in , a green input signal G _in, and a blue input signal B _in . The video output signal includes a red output signal _Rout , a green output signal _Gout, and a blue output signal _Bout . The video input signal and the video output signal are signals for a plurality of pixels constituting one frame.

  In the modification example 1, since the backlight control process is performed for each color, the luminance of each color is used as an index indicating brightness.

In the following description, the luminance is acquired from the multiplication result of the light amount emitted from the light source unit 110 and the video output signal. The maximum luminance value L _MAX is the maximum luminance value of each color in one frame. The luminance upper limit value L _LIM is an upper limit value (here, “1.0”) that the luminance can take. The signal upper limit value is an upper limit value (for example, “255”) that can be taken by the video input signal and the video output signal. Here, when the video input signal is converted into the video output signal, the video input signal and the video output signal basically have a one-to-one relationship.

  First, a state before the backlight control process is performed and a state in which the amount of light emitted from the light source unit 110 is maximum will be described. As shown in the upper part of FIG. 8, a luminance histogram is generated. Since the amount of light emitted from the light source unit 110 is the maximum, the brightness of the histogram shown in the upper part of FIG. 8 is calculated based on the video input signal.

Here, the case where the luminance maximum value L _MAX calculated based on the video input signal is 0.9 times the luminance upper limit value L _LIM is exemplified.

  At this stage, the light amount emitted from the light source unit 110 is the maximum, and the video input signal and the video output signal have a one-to-one relationship. Therefore, the luminance at the signal upper limit value of the video output signal is “1.0. ".

  Second, the state in which the amount of light emitted from the light source unit 110 is reduced in the backlight control process will be described. Here, the amount of light emitted from the light source unit 110 is multiplied by 0.9. Since the amount of light emitted from the light source unit 110 is multiplied by 0.9, the luminance histogram shown in the upper part of FIG. 9 is compressed to the lower luminance side than the luminance histogram shown in the upper part of FIG.

  At this stage, since the amount of light emitted from the light source unit 110 is multiplied by 0.9 and the video input signal and the video output signal have a one-to-one relationship, the luminance at the signal upper limit value of the video output signal is “0”. .9 ".

  Third, in the backlight control process, a state after the video input signal is converted into the video output signal so as to expand the video output signal compared to the video input signal will be described. Here, the video output signal is obtained by multiplying the video input signal by “1.0 / 0.9”. Since the video output signal is expanded as compared with the video input signal, the luminance histogram shown in the upper part of FIG. 10 is extended to the higher luminance side than the luminance histogram shown in the upper part of FIG. That is, since the decrease in the amount of light emitted from the light source unit 110 is compensated by the expansion of the video output signal, the luminance histogram shown in the upper part of FIG. 10 is the same as the luminance histogram shown in the upper part of FIG.

  At this stage, the amount of light emitted from the light source unit 110 is multiplied by 0.9, and the video output signal is expanded as compared with the video input signal. Therefore, the luminance at the signal upper limit value of the video output signal is “1.0”. It is.

  As described above, in the backlight control process, the shortage of light amount due to the decrease in the light amount emitted from the light source unit 110 is compensated by the signal processing. Therefore, the final luminance is maintained.

(Solid light source arrangement example)
Below, the example of arrangement | positioning of the solid light source which concerns on the modification 1 is demonstrated, referring drawings. FIG. 11 is a diagram illustrating cooling of the solid-state light source 111 according to the first modification.

  As shown in FIG. 11, the cooling unit 130 has a refrigerant channel 132 and cools the refrigerant circulating in the refrigerant channel 132. The refrigerant channel 132 is connected to a cooling jacket 131 on which the solid light source 111 is placed, and the cooling jacket 131 is cooled by the refrigerant circulating in the refrigerant channel 132. The solid light source 111 is cooled by the cooling jacket 131.

  Here, in the first modification, the solid light source 111-1, the solid light source 111-2, and the solid light source 111-3 are provided in the order closer to the cooling unit 130 in the direction in which the refrigerant circulates through the refrigerant flow path 132. It illustrates about.

  The solid light sources 111-1 to 111-3 are, for example, a plurality of red solid light sources 111R. Similarly, the solid light sources 111-1 to 111-3 may be a plurality of green solid light sources 111G or a blue solid light source 111B.

(Configuration of control unit)
Hereinafter, a control unit according to Modification 1 will be described with reference to the drawings. FIG. 12 is a block diagram showing a control unit 600 according to the first modification. In FIG. 12, the same components as those shown in FIG.

  As shown in FIG. 12, the control unit 600 includes a backlight pre-processing unit 660 in addition to the configuration shown in FIG.

  The backlight preprocessing unit 660 performs preprocessing of the backlight control processing. As described above, it should be noted that the backlight control process is performed for each of red, green, and blue colors.

Backlight preprocessing unit 660, based on the image input signal, calculates a target amount of light L _T and the target gain G _T. Target light amount L _T is used to control the amount of light emitted from the light source unit 110. Target gain G _T is used to control which converts the video input signal to the video output signal.

In the first modification, the target light quantity L _T may be considered as the ratio between the representative value and the luminance upper limit of brightness for each calculated color based on the image input signal. The target gain G _T, like the target light amount L _T, may be considered as the ratio between the representative value and the luminance upper limit of brightness for each color calculated for each color based on the image input signal. As the representative value of luminance, the maximum luminance value in the frame or the average luminance value in the frame is used.

As described above, the backlight control process, red, to be done for each of the green and blue colors, target light amount L _T and the target gain G _T is noted that the calculated red, each color of green and blue Should.

  Here, the backlight pre-processing unit 660 sets a minimum value MIN of the amount of light emitted from each of the plurality of solid-state light sources 111. Specifically, the backlight preprocessing unit 660 sets the minimum value MIN so that the dew condensation condition is not satisfied based on the dew condensation condition calculated by the calculation unit 620 described above. That is, the backlight preprocessing unit 660 sets the minimum value MIN so that the temperature of each solid light source 111 does not fall below the dew point temperature.

  In addition, as shown in 1st Embodiment, one dew condensation condition common to the some solid light source 111 is calculated. Therefore, in the first modification, one minimum value MIN common to the plurality of solid light sources 111 is set based on the dew condensation condition.

Light source control unit 640 described above, to the extent that the amount of light emitted from the solid light sources 111 is not less than the minimum value MIN, and controls the amount of light (total amount) emitted from the solid light sources 111 to the target light quantity L _T.

(Control of emitted light quantity)
In the following, taking the arrangement of the solid-state light source 111 shown in FIG. 11 as an example, (1) control of the emitted light amount in a general backlight control process, (2) the emitted light amount in the backlight control process according to the modified example 1 Control will be described in order. Here, the target light quantity L _T is illustrated a case is "2/3" of the maximum light amount.

  FIG. 12 is a diagram showing (1) control of the amount of emitted light in a general backlight control process. FIG. 13 is a diagram illustrating control of the amount of emitted light in the backlight control processing according to the first modification.

  (1) In a general backlight control process, for example, among the solid light sources 111-1 to 111-3, the amount of light emitted from the solid light source 111 having the lowest light emission efficiency is preferentially reduced. Accordingly, as shown in FIG. 12, if the light emission efficiency of the solid light source 111-1 is the worst, the light amount emitted from the light source unit 110 is reduced by setting the light amount emitted from the solid light source 111-1 to "0". Controlled to “2/3”. Therefore, the amount of light emitted from the solid light source 111-1 may be less than the minimum value MIN. That is, condensation may occur in the solid light source 111-1.

  On the other hand, in the backlight control processing according to (2) modification example 1, the minimum value MIN of each solid light source 111 is set, so that the amount of light emitted from each solid light source 111 does not fall below the minimum value MIN. Controlled. Accordingly, as shown in FIG. 13, for example, the light amount emitted from the light source unit 110 is controlled to “2/3” by reducing the light amount emitted from the solid light source 111-1 and the solid light source 111-2. The

(Function and effect)
In the first modification, the backlight preprocessing unit 660 sets the minimum value MIN of the amount of light emitted from the plurality of solid state light sources 111 based on the dew condensation condition. The light source control unit 640, to the extent that the amount of light emitted from the solid light sources 111 is not less than the minimum value MIN, and controls the amount of light (total amount) emitted from the solid light sources 111 to the target light quantity L _T. Therefore, in the backlight control process, even if the amount of light emitted from each solid light source 111 is reduced, it is possible to suppress the occurrence of condensation in any of the plurality of solid light sources 111.

[Modification 2]
Hereinafter, Modification Example 2 of the first embodiment will be described with reference to the drawings. Hereinafter, differences from the first embodiment and the first modification will be described.

  In the first modification, the dew condensation condition is one condition common to the plurality of solid light sources 111, and the minimum value MIN is one value common to the plurality of solid light sources 111. On the other hand, in the modified example 2, the dew condensation condition is calculated based on the respective positions of the plurality of solid light sources 111. The minimum value MIN is set based on the position of each of the plurality of solid state light sources 111.

(Control of emitted light quantity)
In the following, taking the arrangement of the solid light source 111 shown in FIG. 11 as an example, (1) control of the amount of emitted light in the backlight control process according to Modification Example 1, and (2) emission in the backlight control process according to Modification Example 2. The control of the light amount will be described in order. Here, the target light quantity L _T is illustrated a case is "2/3" of the maximum light amount.

  FIG. 14 is a diagram showing control of the amount of emitted light in the backlight control processing according to (1) Modification 1. FIG. 15 is a diagram illustrating control of the amount of emitted light in the backlight control process according to the second modification.

  (1) In the first modification, one dew condensation condition common to the plurality of solid state light sources 111 is calculated. Therefore, in the backlight control process according to the first modification, one minimum value MIN common to the plurality of solid light sources 111 is set.

  In the backlight control processing according to the first modification, for example, the light amount emitted from the light source unit 110 (so that the light amount emitted from each of the solid light sources 111-1 to 111-3 does not fall below the minimum value MIN ( Total light intensity) is controlled.

  On the other hand, in (2) Modification 2, a plurality of dew condensation conditions are calculated for each of the plurality of solid light sources 111 based on the respective positions of the plurality of solid light sources 111. Therefore, in the backlight control process according to the first modification, a plurality of minimum values MIN are set for each of the plurality of solid light sources 111 based on a plurality of condensation conditions.

Specifically, the minimum value MIN _{1 of} the solid light source 111-1, the minimum value MIN ₂ of the solid light source 111-2, and the minimum value MIN ₃ of the solid light source 111-3 are set. Here, in the case shown in FIG. 11, the solid light source 111-1, the solid light source 111-2, and the solid light source 111-3 are provided in the order closer to the cooling unit 130 in the direction in which the refrigerant circulates through the refrigerant flow path 132. ing. Since the refrigerant circulating in the refrigerant flow path 132 absorbs the heat of each solid light source 111, the solid light source 111-1 is most easily cooled and the solid light source 111-3 is most difficult to be cooled. Accordingly, each minimum value MIN has a relationship of minimum value MIN ₁ > minimum value MIN ₂ > minimum value MIN ₃ .

The amount of light emitted from the solid-state light source 111-1 so as not to fall below the minimum value MIN _1, the amount of light emitted from the light source unit 110 (total amount) is controlled. Similarly, as the amount of light emitted from the solid-state light source 111-2 does not fall below a minimum value MIN _2, and, as the amount of light emitted from the solid-state light source 111-3 does not fall below a minimum value MIN _3, the light source unit 110 The amount of light emitted from (total light amount) is controlled.

(Function and effect)
In the second modification, the minimum value MIN is set for each of the plurality of solid light sources 111 based on the respective positions of the plurality of solid light sources 111. Therefore, an appropriate minimum value MIN can be set for each of the plurality of solid light sources 111, and the occurrence of condensation in each solid light source 111 can be further suppressed.

[Other Embodiments]
Although the present invention has been described with reference to the above-described embodiments, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  In the embodiment described above, the temperature sensor 710 and the humidity sensor 720 are provided. However, the embodiment is not limited to this. For example, the humidity sensor 720 may not be provided. In such a case, a specified value may be used instead of the environmental humidity detected by the humidity sensor 720. The specified value is determined in consideration of, for example, normal humidity (65 ± 20%) determined by Japanese Industrial Standards. For example, the worst condition (85%) is used as the specified value.

  In the embodiment described above, the red solid light source 111R, the green solid light source 111G, and the blue solid light source 111B are provided. However, the embodiment is not limited to this. For example, a solid light source that emits white component light may be provided.

  DESCRIPTION OF SYMBOLS 10 ... Rod integrator, 21-23 ... Lens, 31-35 ... Mirror, 40 ... Lens, 50 ... Prism, 60 ... Prism, 70 ... Prism, 80 ... Prism, 90 ... Prism, 100 ... Projection type image display apparatus, 110 DESCRIPTION OF SYMBOLS ... Light source unit, 111 ... Solid light source, 112 ... Head, 113 ... Optical fiber, 114 ... Bundle part, 120 ... Power supply unit, 130 ... Cooling unit, 131 ... Cooling jacket, 140 ... Color separation / synthesis unit, 141 ... First unit, 142 ... second unit, 150 ... projection unit, 151 ... projection lens group, 152 ... concave mirror, 160 ... projection side recess, 170 ... front side projection, 180 ... top plate recess, 181 ... inclined surface, 190 ... Cable terminal, 200 ... casing, 210 ... projection side wall, 220 ... front side wall, 230 ... bottom plate, 2 DESCRIPTION OF SYMBOLS 0 ... Top plate, 250 ... 1st side surface side wall, 260 ... 2nd side surface side wall, 300 ... Projection surface, 410 ... Floor surface, 420 ... Wall surface, 500 ... DMD, 600 ... Control unit, 610 ... Image signal reception part 620 ... Calculation unit, 630 ... Element control unit, 640 ... Light source control unit, 650 ... Cooling unit control unit, 660 ... Backlight pre-processing unit, 710 ... Temperature sensor, 720 ... Humidity sensor

Claims (4)

A projection display apparatus comprising: a plurality of solid light sources; a light modulation element that modulates light emitted from the plurality of solid light sources; and a projection unit that projects light emitted from the light modulation elements onto a projection surface Because
One cooling device for cooling the plurality of solid state light sources;
A light source controller that controls the amount of light emitted from each of the plurality of solid-state light sources;
A calculation unit that calculates condensation conditions of the plurality of solid light sources based on at least ambient temperatures of the plurality of solid light sources;
The light source control unit controls the amount of light emitted from each of the plurality of solid state light sources based on the dew condensation condition calculated by the calculation unit. A cooling device controller that controls the cooling power of the one cooling device;
The projection image display apparatus according to claim 1, wherein the cooling device control unit controls a cooling power of the one cooling device based on the dew condensation condition calculated by the calculation unit. An element control unit for controlling the light modulation element based on a video input signal;
A backlight pre-processing unit that calculates a target light amount of light emitted from the plurality of solid-state light sources based on the video input signal;
The backlight pre-processing unit sets a minimum value of the amount of light emitted from each of the plurality of solid-state light sources based on the dew condensation condition calculated by the calculation unit,
The light source control unit controls the amount of light emitted from the plurality of solid light sources to the target amount of light so that the amount of light emitted from each of the plurality of solid light sources does not fall below the minimum value. The projection display apparatus according to claim 1.   The projection display apparatus according to claim 1, wherein the calculation unit calculates a dew condensation condition of each of the plurality of solid light sources based on a position of each of the plurality of solid light sources.

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