JP2013114232A - Projection type video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection type video display device capable of achieving a high luminance of a video.SOLUTION: A projection type video display device 100 includes an adjustment unit 230 and a light source control unit 250. The adjustment unit 230 adjusts the number of subframes constituting one frame. The light source control unit 250 controls a light source unit 10(a light source unit 10R or a light source unit 10B) so that the red component light R or the blue component light B is emitted from a liquid crystal panel 71RB in a data writing period provided between consecutive two subframes when subframes allocated to red component light R or blue component light B out of the subframes constituting one frame are two or more.

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).

  In addition, a technique for adjusting the number of frames per unit time and the number of subframes constituting one frame according to the amount of motion between frames (adjustment of the number of subframes) has been proposed (for example, Patent Document 2). .

JP 2002-244203 A JP 2010-197785 A

  Here, in the projection display apparatus, it is desired to increase the brightness of the image. The above-described adjustment of the number of subframes only increases the number of subframes constituting one frame in order to improve gradation. Therefore, the above-described adjustment of the number of subframes does not contribute to an increase in video brightness.

  Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a projection display apparatus that can increase the brightness of an image.

  The projection display apparatus (projection display apparatus 100) according to the first feature is based on a light source (light source unit 10) that emits first color component light and second color component light, and a first signal value. A first light modulation element (for example, a liquid crystal panel 71RB) that modulates the first color component light and modulates the second color component light based on a second signal value. The projection display apparatus includes a light source control unit (light source control unit 250) that controls the amount of light emitted from the light source, and an adjustment unit (adjustment unit 230) that adjusts the number of subframes constituting one frame. Prepare. The subframe includes a data writing period in which video data is written according to the first signal value or the second signal value, and a light emission period in which light is emitted from the first light modulation element. The light source control unit, in the data writing period, when there is one subframe allocated to the first color component light or the second color component light among the subframes constituting the one frame. The light source is controlled so that the first color component light or the second color component light is not emitted from the first light modulation element. The light source control unit, when there are two or more subframes allocated to the first color component light or the second color component light among the subframes constituting the one frame, In the data writing period provided between the frames, the light source is controlled so that the first color component light or the second color component light is emitted from the first light modulation element.

  In the first feature, the adjustment unit increases the number of subframes constituting the one frame as the degree of occurrence of color break is smaller.

  In the first feature, the projection display apparatus includes an element control unit (element control unit 240) that controls the first light modulation element based on the first signal value and the second signal value. The element control unit corrects the first signal value and the second signal value according to a change in the number of subframes constituting the one frame.

  1st characteristic WHEREIN: The said adjustment part is a said 1st color component light and the said 2nd color among the sub-frames which comprise the said 1 sub-frame based on the said 1st signal value and the said 2nd signal value. The number of subframes allocated to the component light is adjusted.

  In the first feature, in the case where the projection display apparatus displays a stereoscopic image, the adjustment unit includes subframes constituting the one subframe according to the number of observers of the stereoscopic video. Assign different subframes to the viewer of the stereoscopic image.

  In the first feature, when a new observer is added to an existing observer, the adjustment unit adds a number of subframes smaller than the number of subframes assigned to the existing observer. Assign to the right observer.

  ADVANTAGE OF THE INVENTION According to this invention, the projection type video display apparatus which can achieve high brightness | luminance of a video can be provided.

FIG. 1 is a diagram showing a projection display apparatus 100 according to the first embodiment. FIG. 2 is a block diagram showing the control unit 200 according to the first embodiment. FIG. 3 is a diagram for explaining a color break according to the first embodiment. FIG. 4 is a diagram for explaining a color break according to the first embodiment. FIG. 5 is a diagram for explaining the adjustment of the number of subframes according to the first embodiment. FIG. 6 is a diagram for explaining the adjustment of the number of subframes according to the first embodiment. FIG. 7 is a diagram for explaining signal correction according to the first modification. FIG. 8 is a diagram for explaining signal correction according to the first modification. FIG. 9 is a diagram for explaining the histogram according to the second modification. FIG. 10 is a diagram for explaining the histogram according to the second modification. FIG. 11 is a diagram for explaining the adjustment of the number of subframes according to the second modification. FIG. 12 is a diagram for explaining the adjustment of the number of subframes according to the third modification. FIG. 13 is a diagram for explaining the adjustment of the number of subframes according to the third modification. FIG. 14 is a diagram for explaining the adjustment of the number of subframes according to the third 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 modulates the first color component light based on the light source that emits the first color component light and the second color component light, and the first signal value, and the second signal. And a first light modulation element (for example, a liquid crystal panel 71RB) that modulates the second color component light based on the value. The projection display apparatus includes a light source control unit that controls the amount of light emitted from the light source, and an adjustment unit that adjusts the number of subframes constituting one frame. The subframe includes a data writing period in which video data is written according to the first signal value or the second signal value, and a light emission period in which light is emitted from the first light modulation element. The light source control unit, in the data writing period, when there is one subframe allocated to the first color component light or the second color component light among the subframes constituting the one frame. The light source is controlled so that the first color component light or the second color component light is not emitted from the first light modulation element. The light source control unit, when there are two or more subframes allocated to the first color component light or the second color component light among the subframes constituting the one frame, In the data writing period provided between the frames, the light source is controlled so that the first color component light or the second color component light is emitted from the first light modulation element.

  In the embodiment, the adjustment unit adjusts the number of subframes constituting one frame.

  The light source control unit has one subframe allocated to the first color component light or the second color component light among the subframes constituting one frame as a result of adjusting the number of subframes. In this case, the light source is controlled so that the first color component light or the second color component light is not emitted from the first light modulation element in the data writing period.

  When the number of sub-frames is adjusted, the light source control unit has two or more sub-frames assigned to the first color component light or the second color component light among the sub-frames constituting one frame. The light source is controlled so that the first color component light or the second color component light is emitted from the first light modulation element in a data writing period provided between two consecutive subframes. Therefore, it is possible to appropriately increase the brightness of the video.

[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 plurality of light source units 10, a dichroic cube 20, a rod integrator 30, a color separation unit 40, and a plurality of mirrors 50 (mirror 51 and mirror 52). Have 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 plurality of light source units 10 are a light source unit 10R, a light source unit 10G, and a light source unit 10B. Each light source unit 10 is a unit composed of a plurality of solid state light sources. The solid light source is, for example, an LD (Laser Diode) or an LED (Light Emitting Diode). The light source unit 10R includes a plurality of solid light sources that emit red component light R. The light source unit 10G includes a plurality of solid light sources that emit green component light G. The light source unit 10 </ b> B includes a plurality of solid light sources that emit blue component light B.

  The dichroic cube 20 constitutes a color combining unit that combines light emitted from the light source unit 10R, the light source unit 10G, and the light source unit 10B. The combined light (image light) emitted from the dichroic cube 20 is guided to the rod integrator 30.

  The rod integrator 30 is a solid rod made of a transparent member such as glass. The rod integrator 30 makes the light emitted from the dichroic cube 20 uniform. The rod integrator 30 may be a hollow rod whose inner wall is constituted by a mirror surface.

  The color separation unit 40 separates white light emitted from the rod integrator 30. Specifically, the color separation unit 40 separates the third color component light (here, the green component light G) from the white light, the first color component light (here, the red component light R), and the second color. The combined light including component light (here, blue component light B) is separated from white light.

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

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 has a third color component light (here, green component light G) based on a third signal value (here, green input signal G _in / green output signal G _out ). ) Is an example of a second light modulation element that modulates.

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.

Note that, in the first embodiment, the liquid crystal panel 71RB has the first color component light (here, the red component light R) based on the first signal value (here, the red input signal R _in / the red output signal R _out ). ) And the second light component light (here, blue component light B here) based on the second signal value (here, blue input signal B _in / blue output signal B _out ) It is an example of a modulation element.

  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).

(Configuration of control unit)
The control unit according to the first embodiment will be described below with reference to the drawings. FIG. 2 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. Each pixel includes a red subpixel, a green subpixel, and a blue subpixel.

  Note that the lower limit value of the video output signal and the video output signal is, for example, “0”, and the upper limit value of the video output signal and the video output signal is, for example, “255”.

  As shown in FIG. 2, the control unit 200 includes a video signal reception unit 210, a determination unit 220, an adjustment unit 230, an element control unit 240, and a light source control unit 250.

  The video signal receiving unit 210 receives a video input signal from an external device (not shown) such as a personal computer, a DVD, or a TV tuner.

The determination unit 220 determines the degree of occurrence of a color break in one frame. Specifically, the determination unit 220 creates histograms of the red input signal R _in , the green input signal G _in, and the blue input signal B _in , and determines the degree of occurrence of a color break based on the difference between these histograms. To do.

  For example, the determination unit 220 determines the degree of occurrence of color break according to the following procedure.

First, the determination unit 220 identifies representative values of the red input signal R _in , the green input signal G _in, and the blue input signal B _in . The representative value is a maximum value, a minimum value, or an average value. Alternatively, the representative value may be the maximum value of the signal values of the remaining subpixels after removing a predetermined number of subpixels in descending order of the signal value.

Second, the determination unit 220 identifies a difference between representative values of the red input signal R _in , the green input signal G _in, and the blue input signal B _in . Specifically, the determination unit 220 determines the difference between the representative value of the red input signal R _{in and} the representative value of the green input signal G _in , and the difference between the representative value of the red input signal R _{in and} the representative value of the blue input signal B _in. , and, to identify the difference between the representative value of the representative value and the blue input signal B _in the green input signal G _in.

Third, when any one of the representative values of the red input signal R _in , the green input signal G _in and the blue input signal B _in exceeds the threshold value, the determination unit 220 decreases as the total value of these differences decreases. It is determined that the degree of occurrence of color break is large. Alternatively, when any one of the representative values of the red input signal R _in , the green input signal G _in, and the blue input signal B _in exceeds the threshold value, the determination unit 220 has the smallest difference among these differences. It is determined that the degree of occurrence of color break is higher.

  In the first embodiment, the determination unit 220 determines the degree of occurrence of a color break for each of a plurality of areas constituting one frame. Further, the determination unit 220 determines whether or not the degree of occurrence of the color break exceeds a threshold value.

  For example, in the first embodiment, the determination unit 220 determines that a color break occurs in a region where a white image (image W) exists, such as the region 1 and the region 4 illustrated in FIG. On the other hand, the determination unit 220 determines that a color break does not occur in a region where a single color image (image R and image B) exists like the region 1 and the region 4 illustrated in FIG.

  The adjustment unit 230 adjusts the number of subframes constituting one frame. The adjustment unit 230 increases the number of subframes constituting one frame as the degree of occurrence of the color break is smaller.

Here, the length of one frame is the same for the liquid crystal panel 71G and the liquid crystal panel 71RB. The sub-frame includes a data writing period in which video data is written according to the red input signal R _in , the green input signal G _in and the blue input signal B _in , and a light emission period in which light is emitted from the liquid crystal panel 71G or the liquid crystal panel 71RB. including.

  During the data writing period, in principle, the light source unit 10 is controlled so that light is not emitted from the liquid crystal panel 71G or the liquid crystal panel 71RB in order to prevent interframe interference. However, as described below, the light source unit 10 may be controlled so that light is emitted from the liquid crystal panel 71G or the liquid crystal panel 71RB even in the data writing period.

The element control unit 240 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 element control unit 240 controls the liquid crystal panel 71G based on the green output signal _Gout . Element control unit 240, based on the red output signal _{R out,} and the blue output signal _{B out,} controls the liquid crystal panel 71RB.

  The light source control unit 250 controls the light source unit 10. Specifically, the light source control unit 250 controls the period in which light is emitted from each liquid crystal panel 71RB based on the number of subframes constituting one frame. Specifically, the light source control unit 250 controls a period in which light is emitted from each light source unit 10 (light source unit 10R, light source unit 10G, and light source unit 10B).

  In the first embodiment, when the light source control unit 250 has one sub-frame allocated to the red component light R or the blue component light B among the sub-frames constituting one frame, the light source control unit 250 performs red in the data writing period. The light source unit 10 (the light source unit 10R or the light source unit 10B) is controlled so that the component light R or the blue component light B is not emitted from the liquid crystal panel 71RB.

  The light source controller 250 is provided between two consecutive subframes when there are two or more subframes allocated to the red component light R or the blue component light B among the subframes constituting one frame. In the data writing period, the light source unit 10 (light source unit 10R or light source unit 10B) is controlled so that the red component light R or the blue component light B is emitted from the liquid crystal panel 71RB.

  In the data writing period provided between two consecutive subframes, when the light source control unit 250 has two or more subframes allocated to the green component light G among the subframes constituting one frame, The light source unit 10 (light source unit 10G) is controlled so that the green component light G is emitted from the liquid crystal panel 71G.

(Control example of light emission period)
Hereinafter, a control example of the light emission period according to the first embodiment will be described. FIG. 5 is a diagram illustrating a case where it is determined that a color break occurs. FIG. 6 is a diagram illustrating a case where it is determined that a color break does not occur.

As shown in FIGS. 5 and 6, the length of one frame is the same for the liquid crystal panel 71G and the liquid crystal panel 71RB. The sub-frame includes a data writing period in which video data is written according to the red input signal R _in , the green input signal G _in and the blue input signal B _in , and a light emission period in which light is emitted from the liquid crystal panel 71G or the liquid crystal panel 71RB. including.

  As shown in FIG. 5, in a case where it is determined that a color break occurs, the number of subframes constituting one frame is adjusted to two. In other words, in one frame, there is one subframe to which the red component light R is assigned, and in one frame, there is one subframe to which the blue component light B is assigned.

  Therefore, the light source unit 10 (light source unit 10R or light source unit 10B) is controlled so that the red component light R or the blue component light B is not emitted from the liquid crystal panel 71RB during the data writing period.

  However, in one frame, there are two subframes to which the green component light G is allocated. Therefore, the light source unit 10 (light source unit 10G) controls the green component light G to be emitted from the liquid crystal panel 71G in the data writing period (data writing period of subframe 2) provided between two consecutive subframes. Is done.

  As shown in FIG. 6, in a case where it is determined that no color break occurs, the number of subframes constituting one frame is adjusted to four. In other words, in one frame, there are two subframes to which the red component light R is assigned, and in one frame, there are two subframes to which the blue component light B is assigned.

  Therefore, in the data writing period (data writing period of subframe 2 or subframe 4) provided between two consecutive subframes, the light source is arranged so that the red component light R or the blue component light B is emitted from the liquid crystal panel 71RB. The unit 10 (light source unit 10R or light source unit 10B) is controlled.

  Further, in one frame, there are four subframes to which the green component light G is allocated. Accordingly, the light source unit 10 (light source unit 10G) is configured so that the green component light G is emitted from the liquid crystal panel 71G in the data writing period (data writing period of the subframes 2 to 4) provided between two consecutive subframes. Is controlled.

(Function and effect)
In the first embodiment, the adjustment unit 230 adjusts the number of subframes constituting one frame.

  As a result of adjusting the number of subframes, the light source control unit 250 has two or more subframes allocated to the red component light R or the blue component light B among the subframes constituting one frame. The light source unit 10 (light source unit 10R or light source unit 10B) is controlled so that red component light R or blue component light B is emitted from the liquid crystal panel 71RB in a data writing period provided between two consecutive subframes.

  As a result of adjusting the number of subframes, the light source control unit 250 performs data processing when one subframe is allocated to the red component light R or the blue component light B among the subframes constituting one frame. The light source unit 10 (light source unit 10R or light source unit 10B) is controlled so that the red component light R or the blue component light B is not emitted from the liquid crystal panel 71RB during the writing period.

  Therefore, it is possible to appropriately increase the brightness of the video.

  In the first embodiment, the adjustment unit 230 adjusts the number of subframes constituting one frame based on the degree of occurrence of a color break. Therefore, the color break that occurs when light is emitted from the liquid crystal panel 71 and the luminance is improved during the data writing period is reduced.

[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 modification, the element control unit 240 corrects the red output signal R _out , the green output signal G _out , and the blue output signal B _out according to a change in the number of subframes constituting one frame.

  According to the first embodiment, the brightness of the video changes as the number of subframes constituting one frame is adjusted. Here, the final luminance is determined based on the amount of light emitted from the light source unit 10 and the modulation amount of the liquid crystal panel 71 (the signal value of the video output signal).

  As shown in FIG. 7, when the signal value of the video output signal is constant, the amount of change in the final luminance increases between frames as the number of subframes constituting one frame is adjusted. End up.

On the other hand, in the first modification, as shown in FIG. 8, the amount of change in the final luminance between frames is reduced by correcting the red output signal R _out , the green output signal G _out , and the blue output signal B _out. .

That is, the element control unit 240 adjusts the red output signal R _out , the green output signal G _out , and the blue output signal B so that the final luminance changes smoothly according to the change in the number of subframes constituting one frame. Correct _out .

[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 Modification 2, the adjustment unit 230, the red input signal R _in, and a blue input signal B _in, among sub-frames constituting one subframe, the subframe assigned to the red component light R and the blue component light B Adjust the number.

Specifically, first, the adjustment unit 230 generates a histogram of the red input signal R _in in one frame, as shown in FIG. Similarly, as shown in FIG. 10, the adjustment unit 230 generates a histogram of the blue input signal B _in in one frame.

Secondly, the adjustment unit 230 specifies the representative value of the red input signal R _{in and} the representative value of the blue input signal B _in . The representative value is a maximum value, a minimum value, or an average value. Alternatively, the representative value may be the maximum value of the signal values of the remaining subpixels after removing a predetermined number of subpixels in descending order of the signal value.

9 and 10, the adjustment unit 230 illustrates a case where the representative value of the red input signal R _in is larger than the representative value of the blue input signal B _in .

Third, the adjustment unit 230, based on a comparison result between a representative value of the representative value, and a blue input signal B _in the red input signal R _in, of the sub-frames constituting one subframe, the red component light R And the number of subframes allocated to the blue component light B is adjusted.

When the representative value of the red input signal R _in is larger than the representative value of the blue input signal B _{in by} a predetermined threshold or more, the adjusting unit 230 has a larger number of sub frames than the number of sub frames allocated to the blue component light B. The number of subframes is assigned to the red component light R. On the other hand, when the representative value of the blue input signal B _in is larger than the representative value of the red input signal R _{in by} a predetermined threshold or more, the adjustment unit 230 sets the number of sub frames to be assigned to the red component light R. A larger number of subframes is assigned to the blue component light B.

For example, _in the case where the representative value of the red input signal R _in is larger than the representative value of the blue input signal B _in as shown in FIGS. 9 and 10, the adjustment unit 230 causes the red component light R to go as shown in FIG. Are assigned three subframes, and blue component light B is assigned one subframe.

[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 third modification, a case where the projection display apparatus 100 displays a stereoscopic image is illustrated. A stereoscopic image is composed of a plurality of viewpoint images (for example, a left-eye viewpoint image and a right-eye viewpoint image). In the third modification, a case where a plurality of observers observe different stereoscopic images is illustrated.

  In such a case, the adjustment unit 230 assigns different subframes among the subframes constituting one subframe to the stereoscopic video viewer according to the number of stereoscopic video viewers.

  Specifically, as illustrated in FIGS. 12 to 14, a case where the right-eye viewpoint image (R1) and the left-eye viewpoint image (L1) are each configured by four subframes is illustrated.

  As shown in FIG. 12, when there is one observer, all of subframes 1 to 4 are assigned to one observer. In the third modification, as in the first embodiment, when there are two or more subframes allocated to each color component light, each color component light is used in a data writing period provided between two consecutive subframes. It should be noted that the light source unit 10 is controlled so that is emitted from the liquid crystal panel 71.

  In such a case, when a new observer is added to the existing observer, the adjustment unit 230 has a number smaller than the number of subframes assigned to the existing observer as shown in FIG. Are assigned to new observers. That is, the adjustment unit 230 assigns subframes 1 to 3 to the existing observer, and assigns subframe 4 to the new observer.

  However, as illustrated in FIG. 14, the adjustment unit 230 may assign subframes evenly to existing observers and new observers. That is, the adjustment unit 230 assigns subframes 1 to 2 to the existing observer, and assigns subframes 3 to 4 to the new observer.

[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 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.

  In the embodiment, the case where the third color component light is the green component light G is illustrated. However, the third color component light may be red component light R or blue component light B.

  In the embodiment, a solid light source is exemplified as the light source. However, the light source may be a white light source.

  In the embodiment, a liquid crystal panel 71G and a liquid crystal panel 71RB are provided as light modulation elements. However, one light modulation element (first light modulation element) may be provided as the light modulation element. In such a case, one light modulation element (first light modulation element) modulates the red component light R, the green component light G, and the blue component light B.

  DESCRIPTION OF SYMBOLS 10 ... Light source, 20 ... Cross dichroic mirror, 30 ... Rod integrator, 40 ... Color separation part, 50 ... Mirror, 71 ... Liquid crystal panel, 72 ... Incident side polarizing plate, 73 ... Outgoing side polarizing plate, 80 ... Composition part, 90 DESCRIPTION OF SYMBOLS ... Projection lens unit, 100 ... Projection type image display apparatus, 111-113 ... Lens, 200 ... Control unit, 210 ... Image signal reception part, 220 ... Determination part, 230 ... Adjustment part, 240 ... Element control part, 250 ... Light source Control unit

Claims (6)

The light source that emits the first color component light and the second color component light, and the first color component light based on the first signal value, and the second color component light based on the second signal value. A projection-type image display device comprising: a first light modulation element that modulates
A light source controller that controls the amount of light emitted from the light source;
An adjustment unit that adjusts the number of subframes constituting one frame,
The sub-frame includes a data writing period in which video data is written according to the first signal value or the second signal value, and a light emission period in which light is emitted from the first light modulation element,
The light source control unit, in the data writing period, when there is one subframe allocated to the first color component light or the second color component light among the subframes constituting the one frame. Controlling the light source so that the first color component light or the second color component light is not emitted from the first light modulation element;
The light source control unit, when there are two or more subframes allocated to the first color component light or the second color component light among the subframes constituting the one frame, A projection-type image, wherein the light source is controlled so that the first color component light or the second color component light is emitted from the first light modulation element in the data writing period provided between frames. Display device.   2. The projection display apparatus according to claim 1, wherein the adjustment unit increases the number of subframes constituting the one frame as the degree of occurrence of a color break is smaller. An element control unit that controls the first light modulation element based on the first signal value and the second signal value;
2. The projection type according to claim 1, wherein the element control unit corrects the first signal value and the second signal value in accordance with a change in the number of subframes constituting the one frame. Video display device.   The adjustment unit is configured to assign sub-frames assigned to the first color component light and the second color component light among sub-frames constituting the one sub-frame based on the first signal value and the second signal value. The projection display apparatus according to claim 1, wherein the number of frames is adjusted. In the case where the projection display apparatus displays a stereoscopic image,
The adjustment unit may assign different subframes among the subframes constituting the one subframe to the viewers of the stereoscopic video according to the number of viewers of the stereoscopic video. 2. A projection display apparatus according to 1. When a new observer is added to an existing observer,
6. The projection display apparatus according to claim 5, wherein the adjustment unit assigns a number of subframes smaller than the number of subframes assigned to the existing observer to the new observer.

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