JP2010175644A - Video display device and projection type video display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video display device and a projection type video display device capable of suppressing brightness variations of video generated due to light control. <P>SOLUTION: Each solid light source group G respectively includes a combination of two solid light sources L having different brightness distribution B. A light source controller 150 controls light quantity emitted from each light source unit 20 according to the each solid light source group G so that the light quantity emitted from the each light source unit 20 is the target light quantity L<SB>T</SB>. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an image display device including a plurality of solid state light sources and a projection image display device.

  A light amount control process is known as a process for reducing power consumption of a video display device (for example, Patent Document 1). The light quantity control process is a process for reducing the light quantity emitted from the light source based on the video signal for each of the plurality of pixels constituting the frame. In the light amount control process, the signal value of the video signal is increased in accordance with the decrease amount of the light amount emitted from the light source.

  Here, in the light amount control process, a method of preferentially turning off a solid light source that emits light having a large incident angle to the light modulation element among a plurality of solid light sources has been proposed (see Patent Document 2). According to this method, even when the solid-state light source is turned off in the light amount control process, the reduction in the contrast of the image is suppressed.

JP 2000-59629 A JP 2003-121924 A

  In general, light emitted from a solid light source has uneven brightness. If the number of solid light sources to be turned on is reduced by turning off the solid light sources in the light amount control, the influence of luminance unevenness of each solid light source on the image becomes large. That is, luminance unevenness occurs in the video.

  In particular, when only a combination of solid light sources having similar luminance unevenness is lit, noticeable luminance unevenness occurs in the image.

  Accordingly, the present invention has been made to solve the above-described problems, and provides a video display device and a projection video display device that can suppress luminance unevenness of a video caused by light amount control. Objective.

  An image display device according to a feature of the present invention is an image display device including a plurality of solid-state light sources and a light modulation element that modulates light emitted from the plurality of solid-state light sources based on a video signal. A light source control unit that controls the amount of light emitted from the solid light source, an element control unit that controls the signal value of the video signal, a light amount pre-processing unit that calculates a target light amount based on the video signal, and a plurality of solid light sources A luminance distribution acquisition unit that acquires the luminance distribution of light emitted from each of the plurality of solid light sources, and groups the plurality of solid light sources into a plurality of solid light sources based on the luminance distribution acquired for each of the plurality of solid light sources Each of the plurality of solid light source groups includes a combination of solid light sources having different luminance distributions, and the light source control unit is configured so that the amount of light emitted from the plurality of solid light sources becomes the target light amount. Multiple solid light sources And summarized in that to control the amount of light et emitted for each of a plurality of solid state light source groups.

  In the video display device according to the feature of the present invention, the light source control unit is configured to control a solid light source group to be controlled from the plurality of solid light source groups based on the degree of deterioration of the solid light sources included in each of the plurality of solid light source groups. May be selected.

  In the video display device according to the feature of the present invention, the light emitted from the plurality of solid-state light sources includes effective light applied to the light modulation element and non-effective light not applied to the light modulation element. A light amount sensor for detection may be provided, and the luminance distribution acquisition unit may acquire the luminance distribution based on the detection result of ineffective light.

  A projection display apparatus according to a feature of the present invention includes a plurality of solid-state light sources, a light modulation element that modulates light emitted from the plurality of solid-state light sources based on a video signal, and light emitted from the light modulation element. A projection optical display device that projects a light source, a light source control unit that controls the amount of light emitted from a plurality of solid-state light sources, an element control unit that controls the signal value of a video signal, and an image A light amount pre-processing unit that calculates a target light amount based on a signal, a luminance distribution acquisition unit that acquires a luminance distribution of light emitted from a plurality of solid light sources for each of the plurality of solid light sources, and a plurality of solid light sources that are acquired A grouping unit that groups a plurality of solid light sources into a plurality of solid light source groups based on the brightness distribution, each of the plurality of solid light source groups includes a combination of solid light sources having different brightness distributions, The light source control unit has a plurality of As the amount of light emitted from the body source reaches the target light quantity, and summarized in that to control the amount of light emitted from the plurality of solid state light sources for each of a plurality of solid state light source groups.

  A projection display apparatus according to a feature of the present invention includes a dichroic mirror that emits light emitted from a light modulation element to a projection optical system, and the light emitted from the dichroic mirror to the projection optical system is the projection optical system. Including a light amount sensor that detects the ineffective light, and includes a light intensity sensor that detects the ineffective light, and the luminance distribution acquisition unit determines the luminance distribution based on the detection result of the ineffective light. May be obtained.

  A projection display apparatus according to a feature of the present invention includes a light amount sensor that detects reflected light from a screen of light emitted from a projection optical system, and the luminance distribution acquisition unit determines luminance based on a detection result of the reflected light. A distribution may be obtained.

  ADVANTAGE OF THE INVENTION According to this invention, the video display apparatus and projection type video display apparatus which can suppress the brightness nonuniformity of the image | video which arises by light quantity control can be provided.

1 is a diagram showing a projection display apparatus 10 according to a first embodiment. It is a figure which shows the light source unit 20 which concerns on 1st Embodiment. It is a block diagram showing control unit 100 concerning a 1st embodiment. It is a diagram for describing an image pickup image P according to the first embodiment (LR ₁₎ and luminance distribution B (LR _1). It is an example of the group table created by the grouping unit 140 according to the first embodiment. It is an example of the registration table created by the light source control unit 150 according to the first embodiment. It is a flowchart which shows operation | movement of the projection type video display apparatus 10 concerning 1st Embodiment. It is a flowchart which shows the grouping method which concerns on the example 2 of a change. It is an example of the group table created by the grouping unit 140 according to the modification example 2. It is a figure which shows the projection type video display apparatus 11 which concerns on 2nd Embodiment. It is the top view which looked at liquid crystal panel 60R concerning a 2nd embodiment from the light-incidence side. It is a figure which shows the attachment position of the light quantity sensor 91 which concerns on embodiment.

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

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

  In the following, a projection display apparatus is exemplified as the display apparatus. However, it goes without saying that the video display device is not limited to a projection video display device. Specifically, the video display device may be another display device including a liquid crystal television.

[First Embodiment]
(Configuration of projection display device)
Hereinafter, the projection display apparatus according to the first embodiment will be described with reference to the drawings. FIG. 1 is a diagram showing a projection display apparatus 10 according to the first embodiment.

  As shown in FIG. 1, the projection display apparatus 10 includes a light source unit 20, a cylindrical lens 30, a fly-eye lens unit 40, a condenser lens group 50, a liquid crystal panel 60, a cross dichroic mirror 70, a projection. An optical system 80 and a light amount sensor 90 are included.

  The light source unit 20 is provided for each of red, green, and blue colors. That is, the light source unit 20 includes a light source unit 20R, a light source unit 20G, and a light source unit 20B.

  FIG. 2 is a diagram showing the light source unit 20. As shown in FIG. 2A, the light source unit 20R includes 12 solid light sources LR arranged in a matrix. Further, as shown in FIG. 2B, the light source unit 20G has twelve solid light sources LG arranged in a matrix. Similarly, as shown in FIG. 2C, the light source unit 20B has twelve solid-state light sources LB arranged in a matrix. The solid light sources LR, LG, and LB are LD (Laser Diode) and LED (Light Emitting Diode).

  The cylindrical lens 30 is provided for each of red, green, and blue colors. That is, the cylindrical lens 30 includes a cylindrical lens 30R, a cylindrical lens 30G, and a cylindrical lens 30B.

  The cylindrical lens 30R forms linear red component light. The cylindrical lens 30G forms linear green component light. The cylindrical lens 30B forms linear blue component light.

  The fly eye lens unit 40 is provided for each of red, green and blue colors. That is, the cylindrical lens 30 includes a fly-eye lens unit 40R, a fly-eye lens unit 40G, and a fly-eye lens unit 40B.

  The fly eye lens unit 40R includes a fly eye lens 41R and a fly eye lens 42R. The fly-eye lens 41R and the fly-eye lens 42R are each composed of a plurality of minute lenses. Each micro lens condenses the red component light emitted from the light source unit 20R so that the red component light emitted from the light source unit 20R is irradiated on the entire surface of the liquid crystal panel 60R.

  The fly eye lens unit 40G includes a fly eye lens 41G and a fly eye lens 42G. The fly-eye lens 41G and the fly-eye lens 42G are each composed of a plurality of minute lenses. Each micro lens condenses the green component light emitted from the light source unit 20G so that the green component light emitted from the light source unit 20G is irradiated on the entire surface of the liquid crystal panel 60G.

  The fly eye lens unit 40B includes a fly eye lens 41B and a fly eye lens 42B. The fly-eye lens 41B and the fly-eye lens 42B are each composed of a plurality of minute lenses. Each micro lens condenses the blue component light emitted from the light source unit 20B so that the blue component light emitted from the light source unit 20B is irradiated on the entire surface of the liquid crystal panel 60B.

  The condenser lens group 50 is provided for each of red, green, and blue colors. That is, the condenser lens group 50 includes a condenser lens group 50R, a condenser lens group 50G, and a condenser lens group 50B.

  The condenser lens group 50R includes a condenser lens 51R and a condenser lens 52R. The condenser lens 51R and the condenser lens 52R collect red component light emitted from the light source unit 20R.

  The condenser lens group 50G includes a condenser lens 51G and a condenser lens 52G. The condenser lens 51G and the condenser lens 52G collect the green component light emitted from the light source unit 20G.

  The condenser lens group 50B includes a condenser lens 51B and a condenser lens 52B. The condenser lens 51B and the condenser lens 52B collect the blue component light emitted from the light source unit 20B.

  The liquid crystal panel 60 is provided for each of red, green, and blue colors. That is, the liquid crystal panel 60 includes a liquid crystal panel 60R, a liquid crystal panel 60G, and a liquid crystal panel 60B.

  The liquid crystal panel 60R is a light modulation element that modulates the red component light emitted from the light source unit 20R based on the red output signal Rout.

  The liquid crystal panel 60G is a light modulation element that modulates the green component light emitted from the light source unit 20G based on the green output signal Gout.

  The liquid crystal panel 60B is a light modulation element that modulates the blue component light emitted from the light source unit 20B based on the blue output signal Bout.

  Note that the red output signal Rout, the green output signal Gout, and the blue output signal Bout constitute a video output signal. The video output signal is a signal for each of a plurality of pixels constituting one frame. Accordingly, the liquid crystal panel 60R, the liquid crystal panel 60G, and the liquid crystal panel 60B each modulate color component light for each of a plurality of pixels.

  The cross dichroic mirror 70 combines the color component light emitted from each liquid crystal panel 60. The cross dichroic mirror 70 emits the combined light to the projection optical system 80 side.

  The projection optical system 80 projects the combined light emitted from the cross dichroic mirror 70 onto a screen (not shown).

  The light amount sensor 90 detects the amount of light emitted from the projection optical system 80 when measuring the color unevenness of the light emitted from the light source unit 20. In the present embodiment, the light amount sensor 90 is described as an imaging device such as a camera. The light amount sensor 90 is disposed adjacent to the projection optical system 80.

  Specifically, the light amount sensor 90 acquires captured image data by capturing an image of the screen surface when the 12 solid-state light sources LR constituting the light source unit 20R are individually turned on. Similarly, the light amount sensor 90 captures an image of the screen surface when the 12 solid light sources LG constituting the light source unit 20G and the 12 solid light sources LB constituting the light source unit 20B are individually turned on. Captured image data is acquired.

(Configuration of control unit)
The control unit according to the first embodiment will be described below with reference to the drawings. FIG. 3 is a block diagram showing the control unit 100 according to the first embodiment. The control unit 100 is provided in the projection display apparatus 10 and controls the projection display apparatus 10.

  As illustrated in FIG. 3, the control unit 100 includes a video signal receiving unit 110, a light amount preprocessing unit 120, a luminance distribution acquisition unit 130, a grouping unit 140, a light source control unit 150, and an element control unit 160. Have

  The video signal receiving unit 110 receives a video input signal from an external device (not shown) such as a DVD or a TV tuner. The video input signal includes a red input signal Rin, a green input signal Gin, and a blue input signal Bin. The video input signal is a signal input for each of a plurality of pixels constituting one frame.

  The light amount preprocessing unit 120 performs preprocessing of the light amount control processing. The light quantity control process is a process for controlling the light quantity emitted from the light source unit 20 based on the signal value of the video input signal (for example, an index indicating brightness). The light quantity control process is a process for converting a video input signal into a video output signal in accordance with a control amount of the light quantity emitted from the light source unit 20. The light amount control process is uniformly performed for red, green, and blue.

Quantity preprocessing section 120 calculates a target amount of light _{L T} and the maximum light amount _{L MAX,} outputs to the light source control unit 150 and the device control section 160. As described above, the light amount control process, red, to be done for each color of green and blue, the target light quantity L _T and the maximum light amount L _MAX is be noted that the calculated red, each color of green and blue Should.

Target light amount L _T is calculated based on the image input signal, used in the light amount control process. Specifically, as a method of calculating the target light amount L _T, as described below, two types of calculation methods exist.

In the first method, the frequency of the signal value of the video input signal for each of the plurality of pixels is acquired from the signal upper limit value, and the first light amount L ₁ corresponding to the signal value at which the acquired frequency reaches a predetermined number is the target light amount L. Calculated as _T. In the second approach, to obtain a maximum signal value of the video input signal for each of the plurality of pixels, the second light quantity L ₂ is calculated as a target light amount L _T corresponding to a predetermined ratio lower signal value from the obtained maximum signal value The

The maximum light quantity L _MAX is calculated based on the video input signal and used for the light quantity control process. Specifically, the maximum light amount L _MAX is a light amount corresponding to the maximum signal value of the video input signal.

  The luminance distribution acquisition unit 130 acquires the luminance distribution (luminance unevenness) of the light emitted from each solid light source LR for each solid light source LR based on the detection result of the light quantity sensor 90. Similarly, the luminance distribution acquisition unit 130 acquires the luminance distribution of light emitted from each solid light source LG for each solid light source LG based on the detection result of the light quantity sensor 90. Further, the luminance distribution acquisition unit 130 acquires the luminance distribution of light emitted from each solid light source LB for each solid light source LB based on the detection result of the light quantity sensor 90.

FIG. 4A is an example of a captured image P (LR ₁ ) on the screen surface when the solid light source LR ₁ is turned on. As shown in FIG. 4A, the luminance distribution acquisition unit 130 divides the captured image P into M × N small areas A based on the captured image data acquired by the light quantity sensor 90 that is the imaging device. .

Next, the luminance distribution acquisition unit 130 calculates the average luminance of the x × y pixels in the central portion in each of the M × N small regions A. Thereby, as shown in FIG. 4B, the luminance distribution acquisition unit 130 obtains the luminance distribution B (LR ₁ ) = {B (LR ₁ ) ₁₁ , B (LR) for each of the M × N small regions A. _l ) ₁₂ ..., B (LR ₁ ) _NM } is acquired.

Grouping unit 140, based on the solid-state light sources LR obtained brightness distribution for each _{B (LR 1) ~B (LR} 12), 12 pieces of solid state light sources _LR 1 _{~LR 12} six solid-state light source group GR1~ Group into GR6. The grouping unit 140 performs grouping by combining two solid light sources LR having different luminance distributions B. Here, “the luminance distribution B is different” indicates that the luminance unevenness tendency of the two solid light sources LR is different. Therefore, in the light amount control, when two solid-state light sources LR having different luminance distributions B are turned off or turned on, luminance unevenness hardly occurs in the video. The fact that “the luminance distribution B is different” is indicated by the correlation value ρ of the luminance distribution B between the solid light sources LR. The correlation value ρ (k, l) between the solid light source L _k and the solid light source L ₁ is calculated according to the following equation (1). However, k ≠ l.

ここで、上記式（１）において、σｋは、下記式（２）に基づく輝度分布Ｂの標準偏差である。

Here, in the above equation (1), σk is a standard deviation of the luminance distribution B based on the following equation (2).

は、下記式（３）に基づく輝度分布Ｂの平均値である。 In the above formula (1),

Is an average value of the luminance distribution B based on the following formula (3).

  Here, −1 <ρ (k, l) <1, and the larger the correlation value ρ (k, l), the more similar the luminance distributions B of the two solid-state light sources LR, and the smaller ρ (k, l). The brightness distributions B of the two solid light sources LR are different. The grouping unit 140 combines two solid-state light sources LR having a small correlation value ρ so that luminance unevenness is offset.

  FIG. 5 is an example of a group table created by the grouping unit 140. The grouping unit 140 creates a group table shown in FIG. 5 for the solid light source LR, the solid light source LG, and the solid light source LB. Each solid light source group G includes a combination of two solid light sources L having different luminance distributions B.

The light source control unit 150 controls the amount of light emitted from the light source unit 20 for each of red, green, and blue colors. Specifically, the light source control unit 150, the amount of light emitted from the light source unit 20 is such that the target light amount L _T, controls the amount of light emitted from the light source unit 20 for each solid-state light source group G.

The light source controller 150 calculates a reduction amount of the light amount emitted from the light source unit 20R based on the target light amount _LTR calculated for red. The decrease amount is a decrease amount from the maximum light amount of the red component light emitted from the light source unit 20R.

  Here, the light source control unit 150 selects the solid light source group GR to be controlled based on the light emission efficiency of the solid light sources LR included in each solid light source group GR.

  Specifically, the light source control unit 150 preferentially reduces the amount of light emitted from the solid light source group GR with low luminous efficiency. As illustrated in FIG. 6, the light source control unit 150 stores a registration table that combines the group table created by the grouping unit 140 and the light emission efficiencies of the two solid light sources LR included in each solid light source group GR. ing. The light source control unit 150 turns off or reduces the amount of light of the two solid light sources LR included in the solid light source group GR having a low light emission efficiency among the six solid light source groups GR. FIG. 6 shows values normalized by the light emission efficiency of the solid-state light source group GR2 having the highest light emission efficiency.

Similarly, the light source control unit 150 calculates a reduction amount of the light amount emitted from the light source unit 20G based on the target light amount _LTG calculated for green. The decrease amount is a decrease amount from the maximum light amount of the green component light emitted from the light source unit 20G.

  The light source control unit 150 preferentially reduces the amount of light emitted from the solid light source group GG having poor light emission efficiency. Although not shown, the light source control unit 150 stores a registration table that combines the group table created by the grouping unit 140 and the luminous efficiencies of the two solid light sources LG included in each solid light source group GG.

The light source control unit 150 calculates a reduction amount of the light amount emitted from the light source unit 20B based on the target light amount _LTB calculated for blue. The reduction amount is a reduction amount from the maximum amount of blue component light emitted from the light source unit 20B.

  The light source control unit 150 preferentially reduces the amount of light emitted from the solid light source group GB having poor light emission efficiency. Although not shown, the light source control unit 150 stores a registration table that combines the group table created by the grouping unit 140 and the luminous efficiencies of the two solid light sources LB included in each solid light source group GB.

The light source control unit 150, with respect to the light quantity of the solid state light sources LR ₁ in the initial stage of degradation in solid state light sources LR ₁ has not occurred, based on the ratio of the amount of solid-state light source LR ₁ which is periodically measured, the solid-state light sources LR The luminous efficiency of ₁ can be acquired. Similarly, the light source control unit 150 can acquire the luminous efficiencies of the solid light sources LR _{2 to} LR ₁₂ , the solid light sources LG _{1 to} LG ₁₂ , and the solid light sources LB _{1 to} LB ₁₂ . Further, the light source control unit 150 can set the average value of the luminous efficiencies of the two solid light sources L included in each solid light source group G as the luminous efficiency of each solid light source group G.

  The element control unit 160 controls the signal value of the video signal for each of the plurality of pixels for each of red, green, and blue colors. Specifically, the element control unit 160 converts video input signals for a plurality of pixels into video output signals for a plurality of pixels. That is, the element control unit 160 converts the red input signal Rin into the red output signal Rout. Similarly, the element control unit 160 converts the green input signal Gin into the green output signal Gout, and converts the blue input signal Bin into the blue output signal Bout.

Element control unit 160, based on the red to the calculated target amount _{L TR} and maximum light _{L MAXR,} as red output signal Rout is larger than the red input signal Rin, the red input signal Rin red output signal Rout Convert to

Similarly, the element control unit 160, based on the target light _{L TG} and maximum light amount _{L MaxG} calculated for green, as green output signal Gout is greater than the green input signal Gin, green the green input signal Gin It converts into the output signal Gout.

Element control unit 160, based on the target light _{L TB} and the maximum light amount _{L MAXB} calculated for blue, as blue output signal Bout is larger than the blue input signal Bin, a blue input signal Bin blue output signal Bout Convert to

(Operation of projection display device)
Hereinafter, the operation of the projection display apparatus according to the first embodiment will be described with reference to the drawings. FIG. 7A is a flowchart showing grouping in the projection display apparatus 10 according to the first embodiment. FIG. 7B is a flowchart showing a light amount control process in the projection display apparatus 10 according to the first embodiment.

First, as shown in FIG. 7 (a), in step S10, the luminance distribution acquisition unit 130, based on the detection result of the light amount sensor 90, the solid-state light sources _LR 1 _{~LR 12,} the solid-state light source _LG 1 _{~LG 12} and solid The luminance distribution B is acquired for each of the light sources LB _{1 to} LB ₁₂ .

  In step S11, the grouping unit 140 combines two solid light sources L having a small correlation value ρ into the solid light source group G in each of the solid light sources LR, the solid light sources LG, and the solid light sources LB based on the luminance distribution B. Turn into. As a result, a group table is created.

  The grouping as described above is executed at regular intervals at the time of shipment, start-up, or use environment of the projection display apparatus 10.

  Next, a light amount control process using the above-described group table will be described.

First, as shown in FIG. 7 (b), in step S12, the light quantity preprocessing section 120 calculates a target amount of light _{L T} and the maximum light amount _{L MAX,} outputs to the light source control unit 150 and the device control section 160.

In step S <b> 13, the light source control unit 150 controls the amount of light emitted from each solid light source L for each solid light source group G. Specifically, the light source control unit 150, based on the target light quantity L _T and the maximum light amount L _MAX, reducing the amount of light emission efficiency is emitted from the bad solid-state light source group G preferentially.

  In step S <b> 14, the element control unit 160 uniformly controls the signal value of the video signal for each of the plurality of pixels for red, green, and blue.

(Function and effect)
In the first embodiment, each solid light source group G includes a combination of two solid light sources L having different luminance distributions B. Light source control unit 150, the amount of light emitted from the light source unit 20 is such that the target light amount L _T, controls the amount of light emitted from the light source unit 20 for each solid-state light source group G. For example, the light source control unit 150 is turned off for each solid light source group G. Therefore, even in a case where the number of solid light sources to be lit decreases in the light amount control, luminance unevenness can be offset between the plurality of solid light sources L included in each solid light source group G. As a result, it is possible to suppress the occurrence of luminance unevenness in the video.

  Further, the light source control unit 150 selects the solid light source group G to be controlled based on the degree of deterioration of the solid light sources L included in each solid light source group G. For example, the light source control unit 150 preferentially reduces the amount of light emitted from the solid light source group G with low luminous efficiency. Therefore, power can be used effectively, and power saving can be achieved.

[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 grouping unit 140 determines the combination of the two solid light sources L based on the correlation value ρ calculated based on the formula (1). On the other hand, in the first modification, the grouping unit 140 determines the combination of the two solid light sources L based on the variance value V of the luminance distribution B.

The dispersion value V of the solid light source L _k is calculated according to the following formula (4).

  The closer the variance value V is, the more similar the luminance distributions B of the two solid light sources L are. The farther the variance value V is, the different the luminance distributions B of the two solid light sources LR are.

  The grouping unit 140 combines two solid-state light sources LR having different dispersion values V so that luminance unevenness is offset.

[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, each solid light source group G includes a combination of two solid light sources L. On the other hand, in the second modification, each solid light source group G includes one or three or more solid light sources L.

(Grouping method)
Hereinafter, the grouping method according to the second modification will be described with reference to FIG. FIG. 8 is a flowchart showing the grouping method according to the second modification. In the following, a method for grouping solid light sources L _{1 to} L _n (n is a natural number) of the same color will be described as an example.

As shown in FIG. 8, in step S20, the luminance distribution acquisition unit 130 acquires the luminance distribution B for each of the solid light sources L _{1 to} L _n based on the detection result of the light quantity sensor 90.

In step S21, the grouping unit 140 determines whether the solid-state light source L _i of the registration target among the solid-state light source L ₁ ~L _n is not already registered in any of the solid-state light source group G. If not registered, the process proceeds to step S22. On the other hand, if it is registered, step S21 is repeated for the solid light source L _{i + 1} to be registered next.

In step S22, the grouping unit 140 adds the solid-state light source _{L i} in the solid-state light source group _{G i.}

In step S23, the grouping unit 140, a solid-state light source L that are grouped into a solid light source group G _i, to calculate the sum B _all of the luminance distribution B.

For example, if the solid-state light source group _{G i} is the solid-state light source _{L i-2,} containing a solid-state light source _{L i-1} and the solid-state light sources _{L i,} the solid-state light source _{L i-2} of the luminance distribution _{B (L i-2),} the solid-state light source L _i-1 of the luminance distribution B _{(L i-1)} and the solid-state light sources _{L i} of the luminance distribution B _{(L i)} of the sum _{B all (L i-2 +} L i-1 + L i) is the following formula (5) Calculated.

In step S24, the variance value V _all (L _i−2 + L _i−1 + L _i ) of the sum B _al (L _i−2 + L _i−1 + L _i ) _l is calculated. The variance value V _all (L _i−2 + L _i−1 + L _i ) can be calculated based on the above equation (4). The dispersion value _{V all (L i-2 +} L i-1 + L i) has similar luminance distribution B of greater the three solid-state light sources LR, variance _{V all (L i-2 +} L i-1 + L i ) Is smaller, the luminance distributions B of the three solid light sources LR are different.

In step S25, the grouping unit 140 determines whether or not the calculated variance value V _all (L _i−2 + L _i−1 + L _i ) is smaller than a predetermined threshold value V _TH , and is included in the solid light source group G _i . the number Q of the solid state light source L which determines whether more than a predetermined threshold value Q _TH. If the variance value V _all (L _i−2 + L _i−1 + L _i ) is larger than the predetermined threshold V _TH and the number Q is smaller than the predetermined threshold Q _TH , the process proceeds to step S26. On the other hand, when the variance value V _all (L _i−2 + L _i−1 + L _i ) is equal to or smaller than the predetermined threshold value V _TH or the number Q is larger than the predetermined threshold value Q _TH , the process proceeds to step S27.

In step S26, the grouping unit 140, a solid-state light source L most luminance distribution is different among the solid state light source L which is not registered in any of the solid-state light source group G to add to the solid-state light source group G _i. The solid light sources L having the most different luminance distributions can be detected using the equations (1) to (3) described in the first embodiment.

In step S27, the grouping unit 140 registers the solid light source L _i-2 , the solid light source L _i-1 and the solid light source L _i in the solid light source group G _i .

Above steps S21~S27, all solid-state light source _L 1 ~L _n is repeated until grouped. As a result, the group table shown in FIG. 9 is created. As shown in FIG. 9, according to the grouping method according to the second modification, each solid light source group G can include one or three or more solid light sources L. Each solid state light source L ₂ and the solid-state light source L ₄ are, since the luminance distribution is uniform, constitute a solid-state light source group G alone. On the other hand, the solid light source L ₁ , the solid light source L _5, and the solid light source L ₉ are combined to form a solid light source group G in order to cancel the luminance distribution B.

[Second Embodiment]
In the following, a second embodiment of the present invention will be described. In the following, differences from the first embodiment will be mainly described.

  In the first embodiment, the light amount sensor 90 is an image pickup apparatus that is disposed adjacent to the projection optical system 80. On the other hand, in the second embodiment, the light amount sensor 90 is a light amount sensor element disposed on the light incident surface side of the liquid crystal panel 60.

(Configuration of projection display device)
Hereinafter, a projection display apparatus according to the second embodiment will be described with reference to the drawings. FIG. 10 is a diagram showing a projection display apparatus 11 according to the second embodiment.

  As shown in FIG. 10, the projection display apparatus 11 includes a light amount sensor 91. The light quantity sensor 91 is provided for each color of red, green, and blue, and includes a light quantity sensor 91R, a light quantity sensor 91G, and a light quantity sensor 91B.

  The light amount sensor 91R is provided on the light incident surface side of the liquid crystal panel 60R. Similarly, the light amount sensor 91G is provided on the light incident surface side of the liquid crystal panel 60G. The light quantity sensor 91B is provided on the light incident surface side of the liquid crystal panel 60B.

  FIG. 11 is a plan view of the liquid crystal panel 60R as viewed from the light incident surface side. As shown in FIG. 11, the light quantity sensor 91R is configured by four light quantity sensor elements 91Ra. In the present embodiment, the four light quantity sensor elements 91Ra are provided at the four corners of the incident surface of the liquid crystal panel 60R.

  Here, the light emitted from the twelve solid-state light sources LR includes effective light that is applied to the liquid crystal panel 60R and ineffective light that is not applied to the liquid crystal panel 60R. The effective light passes through the liquid crystal panel 60R and enters the cross dichroic mirror 70.

  The light amount sensor element 91Ra detects the light amount of ineffective light at the four corners of the incident surface of the liquid crystal panel 60R.

(Configuration of control unit)
The luminance distribution acquisition unit 130 acquires detection results in the four regions where the light quantity sensor elements 91Ra are arranged. The luminance distribution acquisition unit 130 can calculate the luminance distributions B (LR ₁ ) to B (LR ₁₂ ) using only the detection result of the light quantity sensor element 91Ra.

However, the luminance distribution acquisition unit 130 may interpolate the light amounts in the five interpolation areas SA shown in FIG. 11 based on the detection result of the light amount sensor element 91Ra. The luminance distribution acquisition unit 130 can calculate the luminance distributions B (LR ₁ ) to B (LR ₁₂ ) using the interpolation result in the interpolation area SA in addition to the detection result of the light quantity sensor element 91Ra.

(Function and effect)
In the second embodiment, the projection display apparatus 11 includes a light amount sensor 91 that detects ineffective light that is not irradiated on the liquid crystal panel 60. Therefore, compared with the case where the light quantity sensor 90 is an imaging device, the operation at the time of detecting the light quantity is simple. Further, since the light amount sensor 91 does not block the effective light, it is possible to suppress the light amount from decreasing.

[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.

  For example, in the above-described embodiment, the light source control unit 150 has been described as reducing the light amount for each solid light source group G in the light amount control, but the present invention is not limited to this. In the light amount control, the light source control unit 150 may turn on or increase each solid light source group G when increasing the light amount once decreased. Even in this case, luminance unevenness can be offset between the plurality of solid light sources L included in each solid light source group G. As a result, it is possible to suppress the occurrence of luminance unevenness in the video.

  In the second embodiment, the projection display apparatus 11 includes the light amount sensor 91 that detects ineffective light that is not irradiated on the liquid crystal panel 60. However, the position where the light amount sensor 91 is provided is not limited thereto. It is not something that can be done. The light quantity sensor 91 may be provided between the cross dichroic mirror 70 and the projection optical system 80.

  Specifically, the light quantity sensor 91 may be provided on the light incident surface side of the projection optical system 80 as shown in FIG. Further, the light quantity sensor 91 may be provided on the light emitting surface side of the cross dichroic mirror 70 as shown in FIG. In such a case, luminance unevenness caused by the influence of the liquid crystal panel 60 can be detected together, so that the detection accuracy of the luminance distribution B can be improved.

  In the second embodiment, it has been described that the light amounts in the five interpolation areas SA can be interpolated. However, the position and number of the interpolation areas SA can be arbitrarily set.

  Moreover, in the said embodiment, although the light source control part 150 decided to preferentially control the solid light source group with bad luminous efficiency, it is not restricted to this. For example, the light source control unit 150 may preferentially control a solid light source group that has low light emission efficiency and in which uneven luminance is more easily offset.

In the above embodiment, the grouping unit 140 is set to be grouped on the basis of the respective solid-state light sources LR obtained brightness distribution for each _{B (LR 1) ~B (LR} 12), limited to It is not a thing. For example, it is also possible to actually measure the degree to which luminance unevenness is offset by each combination by turning on all combinations of all solid-state light sources LR.

  In the above embodiment, the transmissive liquid crystal panel 60 has been described as an example of the light modulation element. However, the light modulation element is not limited to this. The light modulation element may be a reflective liquid crystal panel or a DMD (Digital Micromirror Device).

DESCRIPTION OF SYMBOLS 10 ... Projection type video display apparatus, 11 ... Projection type video display apparatus, 20 ... Light source unit, 30 ... Cylindrical lens, 40 ... Fly eye lens unit, 41, 42 ... Fly eye lens, 50 ... Condenser lens group, 60 ... Liquid crystal Panel, 70 ... Cross dichroic mirror, 80 ... Projection optical system, 90, 91 ... Light quantity sensor, 100 ... Control unit, 110 ... Video signal receiving part, 120 ... Light quantity preprocessing part, 130 ... Luminance distribution acquisition part, 140 ... Group 150, light source control unit, 160 ... element control unit, G ... solid light source group, L ... solid light source

Claims (6)

A video display device comprising a plurality of solid state light sources and a light modulation element that modulates light emitted from the plurality of solid state light sources based on a video signal,
A light source controller that controls the amount of light emitted from the plurality of solid state light sources;
An element control unit for controlling a signal value of the video signal;
A light amount pre-processing unit that calculates a target light amount based on the video signal;
A luminance distribution acquisition unit for acquiring the luminance distribution of light emitted from the plurality of solid light sources for each of the plurality of solid light sources;
A grouping unit that groups the plurality of solid light sources into a plurality of solid light source groups based on the luminance distribution acquired for each of the plurality of solid light sources;
Each of the plurality of solid light source groups includes a combination of solid light sources having different luminance distributions,
The light source control unit controls the amount of light emitted from the plurality of solid light sources for each of the plurality of solid light sources so that the amount of light emitted from the plurality of solid light sources becomes the target light amount. Video display device.   The light source control unit selects a solid light source group to be controlled from the plurality of solid light source groups based on a degree of deterioration of the solid light sources included in each of the plurality of solid light source groups. The video display device according to claim 1. The light emitted from the plurality of solid-state light sources includes effective light applied to the light modulation element, and ineffective light not applied to the light modulation element,
A light amount sensor for detecting the ineffective light,
The video display device according to claim 1, wherein the luminance distribution acquisition unit acquires the luminance distribution based on a detection result of the ineffective light. Projection provided with a plurality of solid-state light sources, a light modulation element that modulates light emitted from the plurality of solid-state light sources based on video signals, and a projection optical system that projects light emitted from the light modulation elements Type image display device,
A light source controller that controls the amount of light emitted from the plurality of solid state light sources;
An element control unit for controlling a signal value of the video signal;
A light amount pre-processing unit that calculates a target light amount based on the video signal;
A luminance distribution acquisition unit for acquiring the luminance distribution of light emitted from the plurality of solid light sources for each of the plurality of solid light sources;
A grouping unit that groups the plurality of solid light sources into a plurality of solid light source groups based on the luminance distribution acquired for each of the plurality of solid light sources;
Each of the plurality of solid light source groups includes a combination of solid light sources having different luminance distributions,
The light source control unit controls the amount of light emitted from the plurality of solid light sources for each of the plurality of solid light sources so that the amount of light emitted from the plurality of solid light sources becomes the target light amount. Projection-type image display device. A dichroic mirror that emits the light emitted from the light modulation element to the projection optical system;
The light emitted from the dichroic mirror to the projection optical system includes effective light applied to the projection optical system and ineffective light not applied to the projection optical system,
A light amount sensor for detecting the ineffective light,
The projection display apparatus according to claim 4, wherein the luminance distribution acquisition unit acquires the luminance distribution based on a detection result of the ineffective light. A light amount sensor for detecting reflected light from the screen of light emitted from the projection optical system;
The projection display apparatus according to claim 4, wherein the luminance distribution acquisition unit acquires the luminance distribution based on a detection result of the reflected light.

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