JP2012237962A - Projection type video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection type video display device that can achieve further cost reduction by reducing the number of light modulation elements.SOLUTION: A projection type video display device 100 includes a color separation part 40, a polarization adjustment element 60, a liquid crystal panel 71G, a liquid crystal panel 71RB, and an incidence-side polarization plate 72RB. The polarization adjustment element 60 adjusts the polarization of light entering the polarization adjustment element 60 so as to change the amount of a first polarization component included in red component light R and the amount of a first polarization component included in blue component light B. The first polarization component is a polarization component that transmits through the incidence-side polarization plate 72RB.

Description

  The present invention relates to a projection display apparatus that modulates each color component light after separating white light emitted from a white light source into a plurality of color component lights.

  Conventionally, a color separation unit that separates white light emitted from a white light source into three color component lights (red component light R, green component light G, and blue component light B), and three lights that respectively modulate the three color component lights. A projection display apparatus having a modulation element is known.

  On the other hand, for the purpose of cost reduction, a projection display apparatus having two light modulation elements has also been proposed. Specifically, the color separation unit separates one color component light from the white light and separates the combined light of the two color component lights from the white light. On the optical path of the combined light of the two color component lights, a color switch that emits each of the two color component lights in a time division manner is provided (for example, Patent Document 1).

JP 2002-244203 A

  By the way, in general, the color switch described above is configured by a liquid crystal panel and a polarizing plate. When the light modulation element is a liquid crystal panel, a polarizing plate is provided on the light incident side of the liquid crystal panel. Thus, in the above-described technique, the polarizing plate constituting the color switch and the polarizing plate provided on the light incident side of the light modulation element overlap.

  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 further reduce the cost while reducing the number of light modulation elements. And

The projection display apparatus (projection display apparatus 100) according to the first feature includes a first color component light (for example, green component light G), a second color component light (for example, red component light R), and a first color component light. A color separation unit (color separation unit 40) that separates white light including three-color component light (for example, blue component light B) and an optical path of the combined light including the second color component light and the third color component light And a first light modulation element (liquid crystal panel 71G) that modulates the first color component light based on a polarization adjustment element (polarization adjustment element 60) provided in the first and second signal values (for example, green input signal G _in ). ) And a second signal value (for example, red input signal R _in ), and the second color component light is modulated, and based on a third signal value (for example, blue input signal B _in ), the second color component light is modulated. Second light modulation element (liquid crystal panel 71RB) for modulating three-color component light, and the second light modulation element Provided on the light incident side comprises transmitted through the first polarization component and an incident-side polarizing plate shields the second polarization component (the incident-side polarization plate 72RB). The polarization adjustment element is incident on the polarization adjustment element such that the amount of the first polarization component constituting the second color component light and the amount of the first polarization component constituting the third color component light are changed. Adjust the polarization of light.

  In the first feature, one frame is composed of two subframes. The polarization adjusting element adjusts the polarization so that the first polarization components constituting the second color component light and the third color component light are mixed in one subframe in the one frame. The polarization of light incident on the element is adjusted.

  In the first feature, one frame is composed of two subframes. The first light modulation element is configured to change the light amount of the first color component light emitted from the projection display apparatus in each of the two subframes based on the first signal value. Modulates the first color component light.

  In the first feature, one frame is composed of two subframes. The first light modulation element is configured to output the first color component light emitted from the projection display apparatus in each of the two sub-frames based on a ratio between the second signal value and the third signal value. The first color component light is modulated so that the amount of light changes.

  In the first feature, one frame is composed of two subframes. The first signal value includes an original signal value and an interpolation signal value. The first light modulation element modulates the first color component light based on the original signal value in one subframe, and the first color component light based on the interpolation signal value in the other subframe. Modulate.

  In the first feature, the projection display apparatus further includes a pre-separation polarization adjustment element provided on a light incident side of the color separation unit. The color separation unit separates the white component light according to polarization of light incident on the color separation unit. The pre-separation polarization adjusting element includes the first color component light and the third color component light so that the first color component light and the third color component light are separated into different optical paths by the color separation unit. Adjust the polarization. The pre-separation polarization adjusting element is configured such that the second color component light is separated by the color separation unit into an optical path through which the first color component light is guided and / or an optical path through which the third color component light is guided. The polarization of the second color component light is adjusted.

  In the first feature, one frame is composed of two subframes. The polarization adjustment element includes the first polarization component and the second polarization component light that constitute the second color component light in each of the two frames according to the first signal value, the second signal value, and the third signal value. The first polarization component constituting the third color component light is independently controlled.

  In the first feature, the projection display apparatus includes a light amount of the first color component light emitted from the first light modulation element and a light amount of the second color component light emitted from the second light modulation element. And a light amount control unit (control unit 220) for controlling the light amount of the third color component light emitted from the second light modulation element. The light amount control unit provides a period in which light is not emitted from the second light modulation element in switching of subframes.

  In the first feature, the light amount control unit is configured to control the first color component light emitted from the first light modulation element according to the first signal value, the second signal value, and the third signal value. Increase the amount of light.

  In the first feature, the light amount control unit includes the second color component light emitted from the second light modulation element according to the first signal value, the second signal value, and the third signal value, and / Or increase the amount of the third color component light.

  According to the present invention, it is possible to provide a projection display apparatus that can further reduce costs while reducing the number of light modulation elements.

FIG. 1 is a diagram showing a projection display apparatus 100 according to the first embodiment. FIG. 2 is a diagram for explaining the polarization adjusting element 60 according to the first embodiment. FIG. 3 is a diagram for explaining the polarization adjusting element 60 according to the first embodiment. FIG. 4 is a block diagram showing the control unit 200 according to the first embodiment. FIG. 5 is a diagram illustrating a control example 1 according to the first embodiment. FIG. 6 is a diagram illustrating a control example 2 according to the first embodiment. FIG. 7 is a diagram illustrating a control example 3 according to the first embodiment. FIG. 8 is a diagram for explaining the polarization adjusting element 60 according to the first modification. FIG. 9 is a diagram for explaining the polarization adjusting element 60 according to the second modification. FIG. 10 is a diagram illustrating a control example according to the third modification. FIG. 11 is a diagram for explaining the polarization adjusting element 60 according to the third modification. FIG. 12 is a diagram for explaining the color reproduction range according to the third modification. FIG. 13 is a diagram showing a projection display apparatus 100 according to the fourth modification. FIG. 14 is a diagram illustrating a control example according to the fourth modification. FIG. 15 is a diagram illustrating another control example according to the fourth modification. FIG. 16 is a diagram for explaining a normal control example according to the fifth modification. FIG. 17 is a diagram for explaining a normal control example according to the fifth modification. FIG. 18 is a diagram for explaining a normal control example according to the fifth modification. FIG. 19 is a diagram for explaining the high luminance control example 1 according to the fifth modification. FIG. 20 is a diagram for explaining the high luminance control example 1 according to the fifth modification. FIG. 21 is a diagram for explaining the high luminance control example 1 according to the fifth modification. FIG. 22 is a diagram for explaining the color reproduction range of the high luminance control example 1 according to the modification example 5. FIG. 23 is a diagram for explaining the high luminance control example 2 according to the fifth modification. FIG. 24 is a diagram for explaining the high luminance control example 2 according to the fifth modification. FIG. 25 is a diagram for explaining the high luminance control example 2 according to the fifth modification. FIG. 26 is a diagram for explaining the color reproduction range of the high luminance control example 2 according to the modification example 5. FIG. 27 is a diagram for explaining the correction of the γ curve according to the sixth modification. FIG. 28 is a diagram showing a projection display apparatus 100 according to the seventh modification.

  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 and the like 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]
The projection display apparatus according to the embodiment includes a color separation unit that separates white light including first color component light, second color component light, and third color component light, the second color component light, and the third color light. Based on a polarization adjustment element provided on the optical path of the combined light including the color component light, a first light modulation element that modulates the first color component light based on the first signal value, and a second signal value A second light modulation element that modulates the second color component light and modulates the third color component light based on a third signal value; and a light incident side of the second light modulation element. And an incident-side polarizing plate that transmits the first polarization component and shields the second polarization component. The polarization adjustment element is incident on the polarization adjustment element such that the amount of the first polarization component constituting the second color component light and the amount of the first polarization component constituting the third color component light are changed. Adjust the polarization of light.

  According to this feature, the polarization adjusting element adjusts the amount of the first polarization component constituting the second color component light and the third color component light. That is, for each of the second color component light and the third color component light, the amount of light transmitted through the incident side polarizing plate and guided to the second light modulation element is adjusted.

  Thereby, the number of light modulation elements can be reduced. Moreover, since the polarization adjusting element does not need to have a polarizing plate, the cost can be further reduced.

[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 diagram showing a configuration of a projection display apparatus 100 according to the first embodiment.

  As shown in FIG. 1, the projection display apparatus 100 includes a light source 10, a fly-eye lens 20, a PBS array 30, a color separation unit 40, a plurality of mirrors 50 (mirror 51 and mirror 52), polarization, and the like. Adjustment element 60. The projection display apparatus 100 includes a pair of liquid crystal panels 71 (liquid crystal panel 71G and liquid crystal panel 71RB), a pair of incident side polarizing plates 72 (incident side polarizing plates 72G and incident side polarizing plates 72RB), and a pair. Output side polarizing plate 73 (output side polarizing plate 73G, output side polarizing plate 73RB). The projection display apparatus 100 includes a combining unit 80 and a projection lens unit 90. In addition, the projection display apparatus 100 includes a necessary lens group (lens 111, lens 112, lens 113).

  The light source 10 is a UHP lamp that emits white light. That is, the white light emitted from the light source 10 includes at least red component light R, green component light G, and blue component light B. The white light includes yellow component light Ye.

  In the first embodiment, the green component light G is an example of the first color component light, the red component light R is an example of the second color component light, and the blue component light B is the third color component. It is an example of light.

  The fly-eye lens 20 is an element that homogenizes white light emitted from the light source 10. Specifically, the fly-eye lens 20 has a plurality of minute lenses, and the light emitted from each lens is applied to the liquid crystal panel 71.

  The PBS array 30 is an element (Polarized Beam Splitter) that aligns the polarization direction of white light emitted from the light source 10. For example, the PBS array 30 aligns the polarization direction of white light emitted from the light source 10 with the Y-axis direction (or Z-axis direction).

  The color separation unit 40 separates white light emitted from the light source 10. Specifically, the color separation unit 40 separates the first color component light (here, the green component light G) from the white light, the second color component light (here, the red component light R), and the third color. The combined light including component light (here, blue component light B) is separated from white light.

  The mirror 51 reflects the first color component light (here, the green component light G) toward the liquid crystal panel 71G. The mirror 52 reflects the combined light including the second color component light (here, red component light R) and the third color component light (here, blue component light B) to the liquid crystal panel 71RB side.

  The polarization adjusting element 60 is provided on the optical path of the combined light including the second color component light (here, red component light R) and the third color component light (here, blue component light B). Specifically, the polarization adjusting element 60 controls the polarization of light incident on the polarization adjusting element 60 for each wavelength band.

  Specifically, the polarization adjusting element 60 forms the amount of the first polarization component constituting the second color component light (here, the red component light R) and the third color component light (here, the blue component light B). The polarization of the light incident on the polarization adjusting element 60 is adjusted so that the amount of the first polarization component to be changed is changed. It should be noted that the first polarization component is a polarization component that passes through an incident-side polarizing plate 72 described later.

  For example, as shown in FIG. 2, the polarization adjustment element 60 controls the polarization of light incident on the polarization adjustment element 60 for each wavelength band in accordance with the voltage applied to the polarization adjustment element 60. When no voltage is applied to the polarization adjustment element 60, the polarization adjustment element 60 adjusts the second color component light (here, the red component light R) to the second polarization component, and the third color component light. (Here, the blue component light B) is adjusted to the first polarization component. Accordingly, the third color component light (here, the blue component light B) passes through the incident side polarizing plate 72 and is guided to the liquid crystal panel 71. On the other hand, when a voltage is applied to the polarization adjustment element 60, the polarization adjustment element 60 adjusts the third color component light (here, the blue component light B) to the second polarization component, and the second Color component light (here, red component light R) is adjusted to the first polarization component. Accordingly, the second color component light (here, red component light R) is transmitted through the incident side polarizing plate 72 and guided to the liquid crystal panel 71.

  For example, the wavelength at which the characteristic for adjusting the polarization is switched by turning on / off the voltage applied to the polarization adjusting element 60 extends over the wavelength band of the yellow component light Ye as shown in FIG. Thereby, when no voltage is applied to the polarization adjusting element 60, a part (short wavelength side) of the yellow component light Ye is superimposed on the blue component light B. Further, the yellow component light Ye is superimposed on the red component light R when a voltage is applied to the polarization adjusting element 60.

  3 indicates the intensity of the first polarization component emitted from the polarization adjusting element 60. Also, the horizontal axis of FIG. 3 indicates the wavelength of the color component light.

  Note that the yellow component light Ye may be superimposed on the green component light G depending on the characteristics (cutoff wavelength) of the color separation unit 40.

The liquid crystal panel 71G modulates the green component light G based on the green input signal G _in (green output signal G _out ). On the light incident side of the liquid crystal panel 71G, an incident-side polarizing plate 72G that transmits light having the first polarization component and shields light having the second polarization component is provided. On the other hand, on the light exit side of the liquid crystal panel 71G, an exit side polarizing plate 73G that transmits light having the first polarization component and shields light having the second polarization component is provided.

In the first embodiment, the liquid crystal panel 71G modulates the first color component light (here, the green component light G) based on the first signal value (here, the green input signal G _in ). It is an example of a light modulation element.

The liquid crystal panel 71RB modulates the red component light R based on the red input signal R _in (red output signal R _out ) and modulates the blue component light B based on the blue input signal B _in (blue output signal B _out ). . On the light incident side of the liquid crystal panel 71RB, an incident-side polarizing plate 72RB that transmits light having the first polarization component and shields light having the second polarization component is provided. On the other hand, on the light exit side of the liquid crystal panel 71RB, an exit-side polarizing plate 73RB that transmits light having the first polarization component and shields light having the second polarization component is provided.

  Here, the liquid crystal panel 71RB modulates the red component light R and the blue component light B in a time division manner. For example, when one frame is composed of two subframes, the liquid crystal panel 71RB modulates the red component light R in one subframe and the blue component light B in the other subframe. However, the liquid crystal panel 71RB may modulate the red component light R and the blue component light B in the same subframe.

In the first embodiment, the liquid crystal panel 71RB modulates the second color component light (here, the red component light R) based on the second signal value (here, the red input signal R _in ), This is an example of a second light modulation element that modulates third color component light (here, blue component light B) based on the third signal value (here, blue input signal B _in ).

  The combining unit 80 combines the light emitted from the liquid crystal panel 71G and the light emitted from the liquid crystal panel 71RB. For example, the combining unit 80 is a dichroic prism that reflects light emitted from the liquid crystal panel 71G and transmits light emitted from the liquid crystal panel 71RB. The combining unit 80 may be a dichroic mirror that reflects light emitted from the liquid crystal panel 71G and transmits light emitted from the liquid crystal panel 71RB.

  Alternatively, the combining unit 80 may be a PBS prism or a PBS mirror that reflects light emitted from the liquid crystal panel 71G and transmits light emitted from the liquid crystal panel 71RB. In such a case, it should be noted that the polarization of light emitted from the liquid crystal panel 71G is different from the polarization of light emitted from the liquid crystal panel 71RB.

  The projection lens unit 90 projects light (image light) emitted from the combining unit 80 onto a projection surface (not shown).

  The light source 10, the color separation unit 40, the polarization adjusting element 60, the liquid crystal panel 71, and the incident side polarizing plate 72 may constitute an illumination device. In addition to these elements, the illumination device may include an output-side polarizing plate 73, a combining unit 80, and the like.

(Configuration of control unit)
The control unit according to the first embodiment will be described below with reference to the drawings. FIG. 4 is a block diagram showing the control unit 200 according to the first embodiment. The control unit 200 is provided in the projection display apparatus 100 and controls the projection display apparatus 100.

The control unit 200 converts the video input signal into a video output signal. 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 input for each pixel constituting one frame.

  As shown in FIG. 4, the control unit 200 includes a video signal receiving unit 210 and a control unit 220.

  The video signal receiving unit 210 receives a video input signal from an external device such as a personal computer or a DVD.

  The control unit 220 is connected to the polarization adjustment element 60 and the liquid crystal panel 71 and controls the polarization adjustment element 60 and the liquid crystal panel 71.

  First, the control unit 220 controls the light guided to the liquid crystal panel 71RB by controlling the voltage applied to the polarization adjusting element 60. Specifically, the control unit 220 applies the voltage to the polarization adjusting element 60 so that the third color component light (here, the blue component light B) is guided to the liquid crystal panel 71RB. Control. Further, the control unit 220 controls the polarization adjusting element 60 so that the second color component light (here, the red component light R) is guided to the liquid crystal panel 71RB by applying no voltage to the polarization adjusting element 60. .

Second, the control unit 220 converts the video input signal into a video output signal, and controls the liquid crystal panel 71 based on the video output signal. Specifically, the control unit 220 controls the liquid crystal panel 71G based on the green output signal _Gout . On the other hand, the control unit 220 controls the liquid crystal panel 71RB based on the red output signal _{R out,} controls the liquid crystal panel 71RB based on the blue output signal _{B out.}

The control unit 220, based on the red output signal _{R out,} and the blue output signal _{B out,} controlled by time division LCD panel 71RB. For example, if one frame is constituted by two sub-frames, the control unit 220, in one sub-frame, and it controls the liquid crystal panel 71RB based on the red output signal R _out, the other sub-frame, based on the blue output signal _{B out,} it controls the liquid crystal panel 71RB.

(Control example 1)
Hereinafter, Control Example 1 according to the first embodiment will be described with reference to FIG. FIG. 5 is a diagram for explaining a control example 1 according to the first embodiment. Note that in FIG. 5, the amount of light guided to the combining unit 80 (that is, the amount of image light emitted from the projection display apparatus 100) is shown.

  As shown in the upper part of FIG. 5, in the normal mode, the light amount of the first color component light (here, the green component light G) is evenly distributed in the two subframes.

  On the other hand, as shown in the lower part of FIG. 5, in the specific mode, the light amount of the first color component light (here, the green component light G) is different in each of the two subframes.

Specifically, the control unit 220 adjusts the liquid crystal panel 71G so that the light amount of the green component light G is biased to one of the two subframes so that the total light amount in one frame does not change. To control. The total amount of light in one frame, it should be noted that determined on the basis of the green input signal G _in.

That is, the first light modulation element (here, the liquid crystal panel 71G) emits from the projection display apparatus 100 in each of the two subframes based on the first signal value (here, the green input signal G _in ). The first color component light is modulated so that the amount of the first color component light (here, the green component light G) is changed.

For example, when the green input signal G _in is “153 / 255≈60%”, 60% of the green component light G may be output in the entire frame. In such a case, the control unit 220 controls the liquid crystal panel 71G so that 100% of the green component light G is output in one subframe. In addition, the control unit 220 controls the liquid crystal panel 71G so that 20% of the green component light G is output in the other subframe.

  As described above, by reducing the luminance of one of the two subframes, an effect of improving the motion blur such as black insertion can be obtained.

(Control example 2)
Hereinafter, a control example 2 according to the first embodiment will be described with reference to FIG. FIG. 6 is a diagram for explaining a control example 2 according to the first embodiment. In FIG. 6, it should be noted that the amount of light guided to the combining unit 80 (that is, the amount of image light emitted from the projection display apparatus 100) is shown.

  As shown in the upper part of FIG. 6, in the normal mode, the light amount of the first color component light (here, the green component light G) is evenly distributed in the two subframes.

  On the other hand, as shown in the lower part of FIG. 6, in the specific mode, the light amount of the first color component light (here, the green component light G) is different in each of the two subframes.

Specifically, the control unit 220, one such that the total amount does not change in the frame, based on the ratio between the red input signal R _in a blue input signal B _in, 2 subframes light amount of green component light G The liquid crystal panel 71G is controlled so as to be distributed between the two. The total amount of light in one frame, it should be noted that determined on the basis of the green input signal G _in.

That is, the first light modulation element (here, the liquid crystal panel 71G) is based on the ratio of the second signal value (here, the red input signal R _in ) and the third signal value (here, the blue input signal B _in ). Thus, the first color component light is modulated so that the amount of the first color component light (here, the green component light G) emitted from the projection display apparatus 100 changes in each of the two subframes.

For example, the green input signal G _in is “153 / 255≈60%”, the red input signal R _in is “204 / 255≈80%”, and the blue input signal B _in is “51 / 255≈20%”. In this case, 60% of the green component light G may be output in the entire frame. In such a case, the control unit 220 outputs 96% of the green component light G in the subframe _in which the red component light R is output (that is, the subframe controlled based on the red input signal Rin). Thus, the liquid crystal panel 71G is controlled. In addition, the control unit 220 outputs the liquid crystal so that 24% of the green component light G is output in the subframe _in which the blue component light B is output (that is, the subframe controlled based on the blue input signal Bin). The panel 71G is controlled.

  Thereby, in one subframe, a color break caused by the green component light G being significantly larger than the red component light R (or blue component light B) is suppressed.

(Control example 3)
Hereinafter, Control Example 3 according to the first embodiment will be described with reference to FIG. FIG. 7 is a diagram for explaining a control example 3 according to the first embodiment. In FIG. 7, it should be noted that the amount of light guided to the combining unit 80 (that is, the amount of image light emitted from the projection display apparatus 100) is shown.

  As shown in the upper part of FIG. 7, in the normal mode, the light amount of the first color component light (here, the green component light G) is evenly distributed in the two subframes.

  On the other hand, as shown in the lower part of FIG. 7, in the specific mode, the original video is output in one subframe, and the interpolation frame is output in the other subframe. The original video is a video displayed based on an original signal input from an external device, and the interpolated video is a video displayed based on an interpolation signal generated based on the original signal. The method for generating the interpolated video is arbitrary.

  Specifically, the control unit 220 controls the liquid crystal panel 71G based on the original signal in one subframe. In addition, the control unit 220 controls the liquid crystal panel 71G based on the interpolation signal in the other subframe.

  That is, the first light modulation element (here, the liquid crystal panel 71G) modulates the first color component light (here, the green component light G) based on the original signal value in one subframe, and the other subframe. In the frame, the first color component light (here, the green component light G) is modulated based on the interpolation signal value.

  In this way, since the interpolated video is output in one of the two subframes, a motion blur improvement effect can be obtained.

(Function and effect)
In the first embodiment, the polarization adjusting element 60 adjusts the amount of the first polarization component constituting the second color component light (red component light R) and the third color component light (blue component light B). That is, for each of the second color component light and the third color component light, the amount of light transmitted through the incident side polarizing plate 72RB and guided to the liquid crystal panel 71RB is adjusted.

  As a result, the number of light modulation elements (liquid crystal panels 71) can be reduced. Further, since the polarization adjusting element 60 does not need to have a polarizing plate, the cost can be further reduced.

In the control example 1, the first light modulation element (the liquid crystal panel 71G) is output from the projection display apparatus 100 in each of the two subframes based on the first signal value (green input signal G _in ). The first color component light is modulated so that the amount of the one color component light (green component light G) changes.

  As described above, by reducing the luminance of one of the two subframes, an effect of improving the motion blur such as black insertion can be obtained.

In the control example 2, the first light modulation element (liquid crystal panel 71G) has two subframes based on the ratio of the second signal value (red input signal R _in ) and the third signal value (blue input signal B _in ). The first color component light is modulated so that the amount of the first color component light (green component light G) emitted from the projection display apparatus 100 changes.

  Thereby, in one subframe, a color break caused by the green component light G being significantly larger than the red component light R (or blue component light B) is suppressed.

  In Control Example 3, the first light modulation element (liquid crystal panel 71G) modulates the first color component light (green component light G) based on the original signal value in one subframe, and in the other subframe, The first color component light (green component light G) is modulated based on the interpolation signal value.

  In this way, since the interpolated video is output in one of the two subframes, a motion blur improvement effect can be obtained.

  In the first embodiment, since the green component light G is output in two subframes, priority is given to the luminance of the video. Further, the red component light R and the blue component light B are output in a time division manner. Since the wavelength band of the red component light R and the wavelength band of the blue component light B are separated, it is easy for the polarization adjusting element 60 to separate the red component light R and the blue component light B.

  In the first embodiment, since the wavelength at which the polarization adjustment characteristic is switched by turning on / off the voltage applied to the polarization adjusting element 60 straddles the wavelength band of the yellow component light Ye, the red component light R or the blue component light By superimposing B, the brightness of the video can be increased.

[Modification 1]
Hereinafter, Modification Example 1 of the first embodiment will be described. In the following, differences from the first embodiment will be mainly described.

  In the first embodiment, the case where the first color component light is the green component light G, the second color component light is the red component light R, and the third color component light is the blue component light B is illustrated.

  On the other hand, in the first modification, the first color component light is the red component light R, the second color component light is the green component light G, and the third color component light is the blue component light B. Of course, in the first modification, the configuration of the color separation unit 40 described above is different from that of the first embodiment.

  Here, in the first modification, the wavelength at which the characteristic for adjusting the polarization is switched by turning on / off the voltage applied to the polarization adjusting element 60 spans the wavelength band of the cyan component light Cy as shown in FIG. . As a result, a portion of the cyan component light Cy (short wavelength side) is superimposed on the blue component light B when no voltage is applied to the polarization adjusting element 60. Further, the cyan component light Cy is superimposed on the green component light G when a voltage is applied to the polarization adjusting element 60.

  The vertical axis in FIG. 8 indicates the intensity of the first polarization component emitted from the polarization adjusting element 60. Further, the horizontal axis of FIG. 8 indicates the wavelength of the color component light.

(Function and effect)
In the first modification, since the red component light R is output in two subframes, priority is given to the color of the video. Further, the green component light G and the blue component light B are output in a time division manner. Since the wavelength band of the green component light G and the wavelength band of the blue component light B are separated, it is easy for the polarization adjusting element 60 to separate the green component light G and the blue component light B.

[Modification 2]
Hereinafter, Modification Example 2 of the first embodiment will be described. In the following, differences from the first embodiment will be mainly described.

  In the first embodiment, the case where the first color component light is the green component light G, the second color component light is the red component light R, and the third color component light is the blue component light B is illustrated.

  On the other hand, in the modified example 2, the first color component light is the blue component light B, the second color component light is the red component light R, and the third color component light is the green component light G. Of course, in the first modification, the configuration of the color separation unit 40 described above is different from that of the first embodiment.

  Here, in the first modification, the wavelength at which the characteristic for adjusting the polarization is switched by turning on / off the voltage applied to the polarization adjusting element 60 straddles the wavelength band of the yellow component light Ye as shown in FIG. . Accordingly, the yellow component light Ye is superimposed on the green component light G when no voltage is applied to the polarization adjusting element 60. Further, the yellow component light Ye is superimposed on the red component light R when a voltage is applied to the polarization adjusting element 60.

  Note that the vertical axis in FIG. 9 indicates the intensity of the first polarization component emitted from the polarization adjusting element 60. Further, the horizontal axis of FIG. 9 indicates the wavelength of the color component light.

(Function and effect)
In the modification example 2, since the blue component light B is output in two subframes, priority is given to the color temperature of the video.

  In the second modification, the wavelength at which the polarization adjustment characteristic is switched by turning on / off the voltage applied to the polarization adjusting element 60 straddles the wavelength band of the yellow component light Ye. Can be superimposed to increase the brightness of the image.

[Modification 3]
Hereinafter, Modification 3 of the first embodiment will be described. In the following, differences from the first embodiment will be mainly described.

In the first embodiment, in the sub-frame is controlled based on the red input signal R _in, and outputs the red component light R, the subframe is controlled based on the blue input signal B _in the blue component Light B is output.

  On the other hand, the polarization adjusting element 60 forms the second color component light (here, the red component light R) and the third color component light (here, the blue component light B) in one frame. The polarization of light incident on the polarization adjusting element is adjusted so that one polarization component is mixed in one subframe.

  Specifically, as shown in FIG. 10, the red component light R is output in the subframe 1a of the frame # 1, and the blue component light B is output in the subframe 1b of the frame # 1. That is, frame # 1 is the same as in the first embodiment.

  On the other hand, in the subframe 2b of the frame # 2, the red component light R is output in addition to the blue component light B. In addition, in the subframe 4a of the frame # 4, in addition to the red component light R, the blue component light B is output.

  In FIG. 10, it should be noted that the amount of light guided to the liquid crystal panel 71RB (that is, the amount of light transmitted through the incident-side polarizing plate 72RB) is shown. That is, it should be noted that the amount of light shown in FIG. 10 is different from the amount of light shown in FIGS.

Here, the amount of light adjusted to the first polarization component by the polarization adjusting element 60 varies depending on the voltage applied to the polarization adjusting element 60, as shown in FIG. For example, when the voltages V ₁ is applied to the polarization adjustment element 60, as shown in sub-frame 2b of the frame # 2 described above, in one sub-frame, constituting the red component light R and the blue component light B The first polarization component is mixed.

  That is, the control unit 220 described above controls the mixing ratio of the red component light R and the blue component light B guided to the liquid crystal panel 71RB by controlling the voltage applied to the polarization adjusting element 60.

In this way, by outputting the blue component light B in addition to the red component light R in the subframe controlled based on the red input signal R _in , the color reproduction range becomes magenta as shown in FIG. Although it is reduced, the luminance of the video can be improved. Similarly, by outputting red component light R in addition to blue component light B in the subframe controlled based on the blue input signal B _in , the color reproduction range is reduced in the magenta direction as shown in FIG. However, the brightness of the video can be improved.

[Modification 4]
Hereinafter, Modification Example 4 of the first embodiment will be described with reference to the drawings. In the following, differences from the first embodiment will be mainly described.

  In the first embodiment, the case where the green component light G is separated from the white light and the combined light including the red component light R and the blue component light B is separated from the white light is illustrated.

  On the other hand, in the modified example 4, the combined light including a part of the green component light G and the blue component light B can be separated from the white light and the combined light including a part of the red component light R and the blue component light B. The light can be separated from the white light.

  In the modification example 4, the green component light G is an example of the first color component light, the blue component light B is an example of the second color component light, and the red component light R is the third color component light. It is an example.

(Configuration of projection display device)
Hereinafter, the configuration of the projection display apparatus according to Modification 4 will be described with reference to the drawings. FIG. 13 is a diagram illustrating a configuration of the projection display apparatus 100 according to the fourth modification. In FIG. 13, the same reference numerals are given to the same components as those in FIG.

  As shown in FIG. 13, the projection display apparatus 100 includes a liquid crystal panel 71GB, an incident side polarizing plate 72GB, and an output side polarizing plate 73GB instead of the liquid crystal panel 71G, the incident side polarizing plate 72G, and the output side polarizing plate 73G. Have. The projection display apparatus 100 includes a pre-separation polarization adjustment element 130, a color separation unit 140, a polarization adjustment element 160RB, and a polarization adjustment element 160GB. The color separation unit 140 is provided in place of the color separation unit 40.

  The pre-separation polarization adjusting element 130 is provided on the light incident side of the color separation unit 140. Specifically, the pre-separation polarization adjusting element 130 controls the polarization of light incident on the polarization adjusting element 60 for each wavelength band.

  The pre-separation polarization adjusting element 130 separates the first color component light (here, the green component light G) and the third color component light (here, the red component light R) into different optical paths by the color separation unit 140. As described above, the polarizations of the first color component light and the third color component light are adjusted.

  The pre-separation polarization adjusting element 130 has a second optical path through which the first color component light (here, the green component light G) is guided and / or the third color component light (here, the red component light R) is guided. The polarization of the second color component light (here, the blue component light B) is adjusted so that the color component light is separated by the color separation unit 140.

  For example, the pre-separation polarization adjustment element 130 adjusts the green component light G to the P polarization component and adjusts the red component light R to the S polarization component. Further, the pre-separation polarization adjusting element 130 adjusts the ratio of the P-polarized component and the S-polarized component constituting the blue component light B according to the voltage applied to the pre-separation polarization adjusting element 130. For example, the pre-separation polarization adjusting element 130 adjusts the S-polarized light component constituting the blue component light B when a voltage is applied to the pre-separation polarization adjusting element 130. On the other hand, the pre-separation polarization adjusting element 130 adjusts the P-polarized light component constituting the blue component light B when no voltage is applied to the pre-separation polarization adjusting element 130.

  The color separation unit 140 separates the white component light according to the polarization of the light incident on the color separation unit 140. Specifically, the color separation unit 140 is a PBS (Polarized Beam Splitter) that transmits one polarization component (for example, P polarization component) and reflects the other polarization component (for example, S polarization component).

  The polarization adjusting element 160GB controls the polarization of light incident on the polarization adjusting element 160GB for each wavelength band.

  Specifically, the polarization adjustment element 160GB constitutes the amount of the first polarization component constituting the first color component light (here, the green component light G) and the second color component light (here, the blue component light B). The polarization of the light incident on the polarization adjusting element 160GB is adjusted so that the amount of the first polarization component to be changed is changed. It should be noted that the first polarization component is a polarization component that is transmitted through the incident-side polarizing plate 72GB.

  The polarization adjustment element 160RB includes the amount of the first polarization component constituting the third color component light (here, the red component light R) and the first polarization constituting the second color component light (here, the blue component light B). The polarization of light incident on the polarization adjusting element 160RB is adjusted so that the amount of the component changes. It should be noted that the first polarization component is a polarization component that is transmitted through the incident-side polarizing plate 72RB.

The liquid crystal panel 71GB modulates the green component light G based on the green input signal G _in (green output signal G _out ), and modulates the blue component light B based on the blue input signal B _in (blue output signal B _out ). . On the light incident side of the liquid crystal panel 71GB, an incident-side polarizing plate 72GB that transmits light having the first polarization component and shields light having the second polarization component is provided. On the other hand, on the light exit side of the liquid crystal panel 71GB, an exit side polarizing plate 73GB that transmits light having the first polarization component and shields light having the second polarization component is provided.

  In the modification example 4, the ratio of the blue component light B guided to the polarization adjustment element 160GB and the blue component light B guided to the polarization adjustment element 160RB by adjusting the polarization of the blue component light B by the pre-separation polarization adjustment element 130. Can be adjusted.

  Further, by adjusting the polarization of the green component light G and the blue component light B by the polarization adjusting element 160GB, the ratio of the green component light G and the blue component light B guided to the liquid crystal panel 71GB can be adjusted. Similarly, the ratio of the red component light R and the blue component light B guided to the liquid crystal panel 71RB can be adjusted by adjusting the polarization of the red component light R and the blue component light B by the polarization adjusting element 160RB.

  Therefore, it is possible to arbitrarily adjust the light amounts of the red component light R, the green component light G, and the blue component light B guided to the liquid crystal panel 71 in one frame according to the color balance of the image.

(Control example)
Hereinafter, a control example according to the fourth modification will be described with reference to FIG. FIG. 14 is a diagram for explaining a control example according to the fourth modification. In FIG. 14, it should be noted that the amount of light guided to the liquid crystal panel 71 (that is, the amount of light transmitted through the incident-side polarizing plate 72) is shown.

  As described above, the light amounts of the red component light R, the green component light G, and the blue component light B guided to the liquid crystal panel 71 are arbitrarily adjusted by the pre-separation polarization adjustment element 130, the polarization adjustment element 160GB, and the polarization adjustment element 160RB. It is possible.

  Therefore, for example, as shown in FIG. 14, the combination of subframes from which the red component light R, the green component light G, and the blue component light B are emitted can be arbitrarily changed within one frame.

  Specifically, as in frame # 1, the number of subframes in which the green component light G is output is two, and the number of subframes in which the red component light R (or blue component light B) is output is one. It may be. Also, as in frame # 2, the number of subframes in which the red component light R is output is two, and the number of subframes in which the green component light G (or blue component light B) is output is one. Also good. Further, as in frame # 3, the number of subframes in which green component light G (or red component light R) is output is set to two, and the number of subframes in which blue component light B is output is set to zero. Good.

  In FIG. 14, for the sake of simplicity, the case where the color component light output in one subframe is one color is illustrated. However, the color component light output in one subframe is two colors. It may be.

(Other control examples)
Hereinafter, another control example according to the modification example 4 will be described with reference to FIG. FIG. 15 is a diagram for explaining another control example according to the fourth modification. Note that in FIG. 15, the amount of light guided to the liquid crystal panel 71 (that is, the amount of light transmitted through the incident-side polarizing plate 72) is shown.

  In another control example, a case where any one of the polarization adjustment element 160GB and the polarization adjustment element 160RB is provided will be described. Here, a case where only the polarization adjusting element 160RB is provided is illustrated.

  As described above, the ratio between the blue component light B guided to the optical path of the green component light G and the blue component light B guided to the optical path of the red component light R is adjusted by the pre-separation polarization adjusting element 130.

  Therefore, for example, as shown in FIG. 15, it is possible to adjust the amount of blue component light B superimposed for each subframe.

  Specifically, as in frame # 1, after guiding all of the blue component light B to the optical path of the red component light R, the subframe from which the red component light R is output and the subframe from which the blue component light B is output. The frame may be switched.

  The blue component light B may be superimposed on the green component light G after all the blue component light B is guided to the optical path of the green component light G as in the subframe 2a of the subframe # 2. Like the subframe 2b of the subframe # 2, the blue component light B is superimposed on the green component light G after the blue component light B is separated into the optical paths of the green component light G and the red component light R, and the blue component light G The component light B may be output alone.

  Like the subframe 3a of the subframe # 2, the blue component light B is superimposed on the green component light G after the blue component light B is separated into the optical paths of the green component light G and the red component light R, and the blue component light G The component light B may not be output.

[Modification 5]
Hereinafter, Modification 5 of the first embodiment will be described with reference to the drawings. In the following, differences from the first embodiment will be mainly described.

  In the first embodiment, the case where the polarization adjusting element 60 is configured by one liquid crystal panel has been illustrated. In the modification example 5, the polarization adjusting element 60 is configured by, for example, two liquid crystal panels. In other words, in the fifth modification, the polarization adjusting element 60 includes the first polarization component constituting the second color component light (red component light R) and the first polarization component constituting the third color component light (blue component light B). Control ingredients independently.

  In the following, a case where the driving frequency of the liquid crystal panel 71 is 120 Hz is illustrated. One frame is composed of two subframes. In addition, in order to avoid color mixing between subframes, the liquid crystal panel 71 causes the above-described control unit 220 to display the liquid crystal panel during a period in which video data is written to the frame buffer in accordance with the video output signal (that is, subframe switching). The liquid crystal panel 71 is controlled so that light is not emitted from 71 (particularly, the liquid crystal panel 71RB).

Note that in the period to control the liquid crystal panel 71RB based on the red output signal R _out, the blue component light B emitted from the liquid crystal panel 71RB, color mixing between sub-frames occurs. Similarly, in the period for controlling the liquid crystal panel 71RB based on the blue output signal B _out, the red component light R is emitted from the liquid crystal panel 71RB, color mixing between sub-frames occurs.

  In the fifth modification, the control unit 220 emits the light amount of the first color component light (green component light G) emitted from the first light modulation element (liquid crystal panel 71G) and the second light modulation element (liquid crystal panel 71RB). A light amount control unit that controls the amount of second color component light (red component light R) and the amount of third color component light (blue component light B) emitted from the second light modulation element (liquid crystal panel 71RB). Configure.

(Normal control example)
Hereinafter, an example of normal control will be described with reference to FIGS. First, as illustrated in FIG. 16, the control unit 220 provides a period (black display period) in which light is not emitted from the liquid crystal panel 71 </ b> G and the liquid crystal panel 71 </ b> RB in switching the subframe. In other words, the control unit 220 controls the liquid crystal panel 71G and the liquid crystal panel 71RB so that light is not emitted from the liquid crystal panel 71G and the liquid crystal panel 71RB in a period in which the video data is written to the frame buffer according to the video output signal. Alternatively, the control unit 220 may control the polarization adjusting element 60 so that the liquid crystal panel 71RB is not irradiated with light during the period in which the video data is written to the frame buffer in accordance with the video output signal.

  Here, with respect to the green component light G, color mixture between subframes does not occur, and therefore the green component light G may always be emitted to the liquid crystal panel 71G as shown in FIG. However, the amount of green component light G is too large compared to the amount of red component light R and blue component light B.

  Therefore, as shown in FIG. 18, the period during which the green component light G is emitted from the liquid crystal panel 71G is determined according to the period during which the red component light R and the blue component light B are emitted from the liquid crystal panel 71RB. As described above, in the normal control example, the light amounts of the red component light R and the blue component light B become a limiting condition, and a sufficiently high luminance cannot be achieved.

(High brightness control example 1)
Hereinafter, the high brightness control example 1 according to the modification example 5 will be described with reference to FIGS. 19 to 21.

  First, the control unit 220 calculates the chromaticity of the video to be displayed in the frame based on the video input signal. Subsequently, the control unit 220 determines whether or not the color reproduction range can be reduced on the line connecting red and blue. For example, the control unit 220 determines that the color reproduction range can be reduced on the line connecting red and blue when the representative value of the saturation of red or blue is equal to or less than the threshold in the video to be displayed in the frame. To do. As the saturation value, the maximum value or the average value of the saturation included in the video to be displayed in the frame can be used.

Control unit 220, when judging that it is possible to reduce the color reproduction range of red side on the line connecting the red and blue, as shown in FIG. 20, the liquid crystal panel 71RB based on the red output signal R _out In the period to be controlled, the polarization adjusting element 60 is controlled so that the blue component light B is emitted from the liquid crystal panel 71RB in addition to the red component light R. In other words, the control unit 220 controls the liquid crystal panel 71RB based on the red output signal R _out in the first polarization component (B ₁ (for example, 20%) shown in FIG. 20) included in the blue component light B. The polarization adjusting element 60 is controlled so as to increase.

Similarly, when the control unit 220 determines that the color reproduction range on the blue side can be reduced on the line connecting red and blue, as shown in FIG. 20, the liquid crystal is based on the blue output signal _Bout. In a period in which the panel 71RB is to be controlled, the polarization adjusting element 60 is controlled so that the red component light R is emitted from the liquid crystal panel 71RB in addition to the blue component light B. In other words, the control unit 220 controls the liquid crystal panel 71RB based on the blue output signal B _out during the first polarization component (R ₁ (eg, 20%) shown in FIG. 20) included in the red component light R. The polarization adjusting element 60 is controlled so as to increase.

Furthermore, as shown in FIG. 21, the control unit 220 adds the light amounts of red component light R and blue component light B added to FIG. 19 (R ₁ (for example, 20%) and B ₁ (shown in FIG. 21). For example, the light quantity of the green component light G emitted from the liquid crystal panel 71G (G ₁ (for example, 20% + 20% = 40%) shown in FIG. 21) is increased in accordance with 20%)). Thereby, the light quantity balance of the red component light R, the green component light G, and the blue component light B is maintained.

Here, the light amount R ₁ of the red component light R added to FIG. 19 is preferably the same as the light amount B ₁ of the blue component light B added to FIG. Further, the light amount G ₁ of the green component light G is preferably determined according to the light amount R ₁ of the red component light R and the light amount B ₁ of the blue component light B added to FIG.

  For example, the controller 220 increases the period during which the green component light G is emitted from the liquid crystal panel 71G. It should be noted that FIG. 19 is similar to FIG. 18 described above.

As described above, in the high luminance control example 1, as shown in FIG. 22, the color reproduction range is in the magenta direction by adding the light amounts of the red component light R and the blue component light B (R ₁ and B ₁ shown in FIG. 21). However, the luminance of the image can be increased by adding the light amounts of the red component light R, the green component light G, and the blue component light B (R ₁ , G ₁ , and B ₁ shown in FIG. 21). .

(High brightness control example 2)
Hereinafter, the high brightness control example 2 according to the modification example 5 will be described with reference to FIGS. 23 to 25.

  First, the control unit 220 calculates the chromaticity of the video to be displayed in the frame based on the video input signal. Subsequently, the control unit 220 determines whether or not the color reproduction range can be reduced to the green side for each color on the line connecting red and blue. For example, in the video to be displayed in the frame, the control unit 220 determines that the color reproduction range can be reduced when the representative value of the saturation of each color on the line connecting red and blue is equal to or less than a threshold value. As the saturation value, the maximum value or the average value of the saturation included in the video to be displayed in the frame can be used.

Control unit 220, when judging that it is possible to reduce the color reproduction range of red side, as shown in FIG. 24, the period for controlling the liquid crystal panel 71RB based on the red output signal R _out, the red component The polarization adjusting element 60 is controlled so that the blue component light B is emitted from the liquid crystal panel 71RB in addition to the light R. That is, the control unit 220 controls the liquid crystal panel 71RB based on the red output signal R _out in the first polarization component (B ₁ (for example, 20%) shown in FIG. 24) included in the blue component light B. The polarization adjusting element 60 is controlled so as to increase.

Similarly, the control unit 220, when judging that it is possible to reduce the color reproduction range of the blue side, as shown in FIG. 24, the period for controlling the liquid crystal panel 71RB based on the blue output signal B _out The polarization adjusting element 60 is controlled so that the red component light R is emitted from the liquid crystal panel 71RB in addition to the blue component light B. That is, the control unit 220, the period for controlling the liquid crystal panel 71RB based on the blue output signal _{B out,} first polarized light component contained in the red component light R _{(R 1} shown in FIG. 24 (e.g., 20%)) The polarization adjusting element 60 is controlled so as to increase.

In the high luminance control example 2, as shown in FIG. 24, the control unit 220 converts the light amounts of red component light R and blue component light B added to FIG. 23 (R ₁ and B ₁ shown in FIG. 24). Accordingly, the amount of green component light G emitted from the liquid crystal panel 71G (G ₂ and G ₃ shown in FIG. 24) is increased.

Specifically, the control unit 220 emits light from the liquid crystal panel 71G during a period in which the liquid crystal panel 71RB is to be controlled based on the red output signal R _out according to the color reproduction range that can be reduced to the green side on the red side. The amount of green component light G (G ₂ (for example, 20%) shown in FIG. 24) is increased. Similarly, the control unit 220, green depending on reducible color reproduction range in the green side in the blue side, the period for controlling the liquid crystal panel 71RB based on the blue output signal B _out, which is emitted from the liquid crystal panel 71G The amount of component light G (G ₃ (for example, 40%) shown in FIG. 24) is increased.

Further, as shown in FIG. 25, the control unit 220 adds the light amounts of red component light R and blue component light B added to FIG. 23 (R ₁ (for example, 20%) and B ₁ (shown in FIG. 25). For example, in accordance with 20%)), the amount of green component light G emitted from the liquid crystal panel 71G (G ₁ (for example, 20% + 20% = 40%) shown in FIG. 25) is increased. Thereby, the light quantity balance of the red component light R, the green component light G, and the blue component light B is maintained.

Here, the light amount R ₁ of the red component light R added to FIG. 23 is preferably the same as the light amount B ₁ of the blue component light B added to FIG. Further, the light amount G ₁ of the green component light G is preferably determined according to the light amount R ₁ of the red component light R and the light amount B ₁ of the blue component light B added to FIG.

As described above, in the high-luminance control example 2, by adding the light amounts of the red component light R, the green component light G, and the blue component light B (R ₁ , G ₂ , G _3, and B ₁ shown in FIG. 25), FIG. As shown in FIG. 25, the color reproduction range is reduced in the magenta direction and the green direction, but the light amounts of the red component light R, the green component light G, and the blue component light B (R ₁ , G ₁ , G ₂ , G shown in FIG. 25). _By adding ₃ and B ₁ ), it is possible to increase the brightness of the video.

[Modification 6]
Hereinafter, Modification 6 of the first embodiment will be described with reference to the drawings. In the following description, differences from Modification 5 will be mainly described.

In the fifth modification, the control unit 220 adds the light amounts (R ₁ and B ₁ ) of the red component light R and the blue component light B under the control of the polarization adjusting element 60. Further, the control unit 220 adds the light amount (G ₁ , G ₁ ′ and G ₁ ″) of the green component light G with an increase in the period during which the green component light G is emitted from the liquid crystal panel 71G.

  On the other hand, in the modified example 6, the control unit 220 adds the light amounts of the red component light R, the green component light G, and the blue component light B by correcting the γ curve, as shown in FIG. The γ curve is a curve indicating the correspondence between the video input signal and the video output signal, and is used to convert the video input signal into a video output signal.

Specifically, a case where the additional light amount (R ₁ ) of the red component light R is different from the additional light amount (B ₁ ) of the blue component light B can be considered. In such a case, the liquid crystal in the red output signal R _out period for controlling the liquid crystal panel 71RB amount of light emitted from the liquid crystal panel 71RB in period for controlling the liquid crystal panel 71RB is based on the blue output signal B _out on the basis of It differs from the amount of light emitted from the panel 71RB. Therefore, in order to eliminate such an imbalance, it is possible to balance the amount of light between subframes by correcting the γ curve.

For example, in the case where the light amount (B ₁ ) of the blue component light B is 20% and the additional light amount (R ₁ ) of the red component light R is 0%, the liquid crystal panel 71RB is controlled based on the red output signal R _out. Although the amount of light emitted from the liquid crystal panel 71RB in should do period is increased, the amount of light emitted from the liquid crystal panel 71RB in period for controlling the liquid crystal panel 71RB based on the blue output signal B _out is not increased. Accordingly, the period for controlling the liquid crystal panel 71RB based on the blue output signal B _out, the control unit 220 corrects the γ curve, balance amount between the sub-frame.

[Modification 7]
Hereinafter, Modification Example 7 of the first embodiment will be described with reference to the drawings. In the following, differences from the first embodiment will be mainly described.

  In the first embodiment, a case in which a transmissive liquid crystal panel is used as the light modulation element is illustrated. On the other hand, in the modified example 7, a reflective liquid crystal panel (for example, LCOS; Liquid Crystal on Silicon) is used as the light modulation element.

(Configuration of projection display device)
Hereinafter, the configuration of the projection display apparatus according to the modification example 7 will be described with reference to the drawings. FIG. 28 is a diagram illustrating a configuration of the projection display apparatus 100 according to the seventh modification. In FIG. 28, it should be noted that the same components as those in FIG.

  As shown in FIG. 28, the projection display apparatus 100 includes a light source 10, a fly-eye lens 20, a PBS array 30, a color switch 320, a polarization adjustment element 360, and a pair of reflective liquid crystal panels 371 ( A reflective liquid crystal panel 371G, a reflective liquid crystal panel 371RB), a separation / synthesis element 380, and a projection lens unit 90. The projection display apparatus 100 includes a necessary lens group (lens 111).

  The color switch 320 rotates the polarization of light having a specific wavelength band by 90 °. Here, the color switch 320 rotates the polarization of the red component light R and the blue component light B by 90 °, and transmits the red component light R and the blue component light B. On the other hand, the color switch 320 transmits the green component light G without rotating the polarization of the green component light G.

  Similarly to the polarization adjustment element 60, the polarization adjustment element 360 is on the optical path of the combined light including the second color component light (here, the red component light R) and the third color component light (here, the blue component light B). Is provided. Specifically, the polarization adjusting element 60 controls the polarization of light incident on the polarization adjusting element 60 for each wavelength band.

Similar to the liquid crystal panel 71G, the reflective liquid crystal panel 371G modulates the green component light G based on the green input signal G _in (green output signal G _out ). The reflective liquid crystal panel 371G is, for example, LCOS.

Similar to the liquid crystal panel 71RB, the reflective liquid crystal panel 371RB modulates the red component light R based on the red input signal R _in (red output signal R _out ) to generate the blue input signal B _in (blue output signal B _out ). Based on this, the blue component light B is modulated. The reflective liquid crystal panel 371RB is, for example, LCOS.

  The separating / combining element 380 separates the combined light including the red component light R and the blue component light B from the green component light G. The separation / combination element 380 combines the combined light including the red component light R and the blue component light B with the green component light G. The separation / synthesis element 380 is, for example, a PBS cube.

  Specifically, the separation / combination element 380 reflects the S-polarized green component light G emitted from the color switch 320 toward the reflective liquid crystal panel 371G. The separation / combination element 380 transmits the P-polarized red component light R and blue component light B emitted from the color switch 320 to the reflective liquid crystal panel 371RB side.

  The separation / combination element 380 transmits the P-polarized green component light G emitted from the reflective liquid crystal panel 371G to the projection lens unit 90 side. The separation / combination element 380 reflects the S-polarized red component light R and blue component light B emitted from the reflective liquid crystal panel 371RB to the projection lens unit 90 side.

[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.

  Although not particularly mentioned in the embodiment, the polarization adjusting element 60, the polarization adjusting element 160GB, and the polarization adjusting element 160RB may be configured by a single liquid crystal panel. Alternatively, the polarization adjustment element 60, the polarization adjustment element 160GB, and the polarization adjustment element 160RB may be configured by two liquid crystal panels. In such a case, it is possible to independently control the amount of the first polarization component constituting the two color component lights.

  Although not particularly mentioned in the embodiment, the driving frequency (for example, 60 Hz) of the liquid crystal panel 71G that modulates the color component light of a single color is the driving frequency (for example, 120 Hz) of the liquid crystal panel 71RB that modulates the color component light of a plurality of colors. May be lower.

  Although not particularly mentioned in the embodiment, the resolution of the liquid crystal panel 71G that modulates the color component light of a single color may be lower than the resolution of the liquid crystal panel 71RB that modulates the color component light of a plurality of colors. Since the liquid crystal panel 71G modulates the green component light G in two subframes, it is possible to compensate for low resolution by displaying an interpolated image as in Control Example 3, for example.

  Although not specifically mentioned in the first embodiment, the control examples 1 to 3 may be switched based on the video input signal. For example, an appropriate control example is selected from Control Examples 1 to 3 based on a motion vector specified based on the video input signal. Alternatively, an appropriate control example is selected from the control examples 1 to 3 based on the color balance of the video specified based on the video input signal.

  Although not particularly mentioned in the modification example 4, it is known that according to the MacAdam ellipse, it is difficult for humans to recognize color changes even when light on the short wavelength side is mixed. Therefore, the second color component light superimposed on the other color component light is preferably the blue component light B.

  DESCRIPTION OF SYMBOLS 10 ... Light source, 20 ... Fly eye lens, 30 ... PBS array, 40 ... Color separation part, 50 ... Mirror, 60 ... Polarization adjustment element, 71 ... Liquid crystal panel, 72 ... Incident side polarizing plate, 73 ... Outgoing side polarizing plate, DESCRIPTION OF SYMBOLS 80 ... Synthesis | combination part, 90 ... Projection lens unit, 100 ... Projection type image display apparatus, 111-113 ... Lens, 130 ... Polarization adjustment element before separation, 140 ... Color separation part, 160GB ... Polarization adjustment element, 160RB ... Polarization adjustment element , 200 ... control unit, 210 ... video signal receiving unit, 220 ... control unit, 320 ... color switch, 360 ... polarization adjusting element, 371 ... reflective liquid crystal panel, 380 ... separation / combination element

Claims (10)

A color separation unit that separates white light including first color component light, second color component light, and third color component light;
A polarization adjusting element provided on the optical path of the combined light including the second color component light and the third color component light;
A first light modulation element that modulates the first color component light based on a first signal value;
A second light modulation element that modulates the second color component light based on a second signal value and modulates the third color component light based on a third signal value;
An incident-side polarizing plate that is provided on the light incident side of the second light modulation element and transmits the first polarization component and shields the second polarization component;
The polarization adjustment element is incident on the polarization adjustment element such that the amount of the first polarization component constituting the second color component light and the amount of the first polarization component constituting the third color component light are changed. A projection-type image display apparatus, characterized by adjusting polarization of light to be emitted. One frame is composed of two subframes,
The polarization adjusting element adjusts the polarization so that the first polarization components constituting the second color component light and the third color component light are mixed in one subframe in the one frame. The projection display apparatus according to claim 1, wherein polarization of light incident on the element is adjusted. One frame is composed of two subframes,
The first light modulation element is configured to change the light amount of the first color component light emitted from the projection display apparatus in each of the two subframes based on the first signal value. The projection display apparatus according to claim 1, wherein the first color component light is modulated. One frame is composed of two subframes,
The first light modulation element is configured to output the first color component light emitted from the projection display apparatus in each of the two sub-frames based on a ratio between the second signal value and the third signal value. The projection display apparatus according to claim 1, wherein the first color component light is modulated so that the amount of light changes. One frame is composed of two subframes,
The first signal value includes an original signal value and an interpolation signal value;
The first light modulation element modulates the first color component light based on the original signal value in one subframe, and the first color component light based on the interpolation signal value in the other subframe. The projection type image display apparatus according to claim 1, wherein the projection type image display apparatus is modulated. Further comprising a pre-separation polarization adjusting element provided on the light incident side of the color separation unit,
The color separation unit separates the white component light according to polarization of light incident on the color separation unit,
The pre-separation polarization adjusting element includes the first color component light and the third color component light so that the first color component light and the third color component light are separated into different optical paths by the color separation unit. Adjust the polarization of
The pre-separation polarization adjusting element is configured such that the second color component light is separated by the color separation unit into an optical path through which the first color component light is guided and / or an optical path through which the third color component light is guided. The projection display apparatus according to claim 1, wherein polarization of the second color component light is adjusted. One frame is composed of two subframes,
The polarization adjustment element includes the first polarization component and the second polarization component light that constitute the second color component light in each of the two frames according to the first signal value, the second signal value, and the third signal value. 2. The projection display apparatus according to claim 1, wherein the first polarization component constituting the third color component light is independently controlled. The amount of the first color component light emitted from the first light modulation element, the amount of the second color component light emitted from the second light modulation element, and the first light emitted from the second light modulation element. A light amount control unit for controlling the light amount of the three-color component light;
The projection image display apparatus according to claim 1, wherein the light amount control unit provides a period in which light is not emitted from the second light modulation element in switching of subframes.   The light amount control unit increases the light amount of the first color component light emitted from the first light modulation element according to the first signal value, the second signal value, and the third signal value. 9. The projection display apparatus according to claim 8, wherein   The light amount control unit is configured to output the second color component light and / or the third color emitted from the second light modulation element according to the first signal value, the second signal value, and the third signal value. 9. The projection display apparatus according to claim 8, wherein the amount of component light is increased.

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