JP5150183B2 - Projection display device - Google Patents

Description

  The present invention relates to a projection display apparatus.

  A so-called three-plate projection type video display device is known in which each of three colors of light (red, blue, and green) is modulated by corresponding three light modulation elements (for example, a liquid crystal panel) (Patent Document 1). Such). In this apparatus, the light emitted from the three light modulation elements is synthesized by light synthesis means (for example, a cross dichroic cube) and projected as an image by the projection means.

  Further, in recent years, there is a four-plate projection type image display apparatus that decomposes white light into four colors of red, blue, green, and yellow and includes four light modulation elements corresponding to these colors.

JP-A-11-102014 WO2005 / 013193

  According to the projection-type image display apparatus of Patent Document 2, the color reproducibility is improved by adopting a so-called four-plate system that modulates four colors of light using four liquid crystal panels. . However, there is a problem that the cost increases by using four light modulation elements. In such a projection display apparatus, the red, blue, and green modulated light modulated by the light modulation element is synthesized by a light combining element (eg, dichroic prism), and then the yellow modulation modulated by the light modulation element is performed. Since the light is combined, it is necessary to dispose two light combining elements between the projection lens and the light modulation element, and the distance between the projection lens and the light modulation element becomes long. As a result, it is necessary to use a projection lens having a long back focus, and there is a problem that the cost of the projection lens increases.

  SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to improve color reproducibility without increasing the cost of a projection display apparatus.

The present invention includes first, second, and third light sources that emit red light, blue light, and green light, respectively.
First, second, and third light modulating means for modulating light from each of the light sources according to a video signal, light combining means for combining the light modulated by the light modulating means, a projection type video display apparatus provided with a light projecting means for projecting the light combined by the combining means, the first color light in substantially complementary relationship with any two of the one light source of the second or third light source A fourth light source that emits color light, a fifth light source that emits color light that is substantially complementary to the other one of the first, second, and third light sources, and the first, second, Light emission control means for controlling the light emission of the third, fourth , or fifth light source, and the light from the fourth light source is substantially in a complementary color relationship with the fourth light source. a light modulating means for modulating light from 2 or any two of one light source of the third light source Incident light from the fifth light source modulates light from the other one of the first, second, and third light sources that is substantially complementary to the fifth light source. The light emission control means is substantially complementary to the light of the fourth light source and the light of the fourth light source according to the luminance or saturation of the video signal. Controls the respective light emission times with the light of one of the first, second and third light sources, and substantially complements the light of the fifth light source and the light of the fifth light source. Each of the first, second, and third light sources having the above relationship is controlled with respect to the light emission time of the other of the two light sources. Control is performed.

  For example, red light and cyan light are incident on the same light modulator, and blue light and yellow light are incident on the same light modulator.

  Since this projection type image display apparatus is realized by a so-called three-plate type similar to the conventional one while increasing the number of colors of the light source light, it is possible to improve the color reproducibility without increasing the cost. Further, by controlling the light emission time of each light source according to the luminance and saturation of the video signal, it is possible to realize both improvement in color reproducibility and increase in luminance. Furthermore, since the two light sources incident on the same light modulation means are light sources having a complementary color relationship, white balance control is easy.

It said light emission control means includes a fourth light source, the first in the nearly complementary color relationship and the fourth light source emit light alternately and any two of the one light source of the second or third light source And the fifth light source and the other one of the first, second, and third light sources that are substantially complementary to the fifth light source are alternately caused to emit light. The light may enter the modulation means.

  According to the projection display apparatus of the present invention, it is possible to improve the color reproducibility without increasing the cost because it is realized by a so-called three-plate type similar to the conventional one while increasing the number of light sources. it can. Further, it is not necessary to use an expensive projection lens having a long back focus, and the same projection lens as that in the case of the three-plate type can be used. Therefore, the cost and size of the projection display apparatus can be reduced.

  Hereinafter, embodiments of the projection display apparatus of the present application will be described.

<First Embodiment>
FIG. 1 is a diagram showing a configuration of the projection display apparatus 10. The projection display apparatus 10 includes light source units 1A to 1C, liquid crystal display panels 2A to 2C as light modulation units, a dichroic prism 3 as a color synthesis unit, a projection lens 4, and a control unit 5.

  The light source unit 1A includes an LED light source 11b that emits blue light and an LED light source 11y that emits yellow light. The light source unit 1B includes LED light sources 11g and 11g 'that emit green light. The light source unit 1C includes an LED light source 11r that emits red light and an LED light source 11c that emits cyan light.

  As described above, light sources of two colors having a complementary color relationship are arranged in the light source units 1A and 1C. On the other hand, only the green light source is arranged in the light source unit 1B. In terms of improving color reproducibility, it is preferable to arrange a magenta light source that is a complementary color of green. However, since magenta is not so-called monochromatic light, there is no magenta color light source. Accordingly, only the green light source is disposed in the light source unit 1B.

  Light from the light source units 1A, 1B, and 1C is incident on the liquid crystal display panels 2A, 2B, and 2C, respectively. Although not shown, an optical integration means (for example, realized by a fly-eye lens or a rod integrator) can be disposed between each light source unit and each liquid crystal display panel. This light integrating means is provided for the purpose of making the light emitted from each LED light source have a uniform luminance distribution within the panel surface of each liquid crystal display panel.

  The liquid crystal display panels 2A to 2C modulate incident light by changing the light transmittance. The liquid crystal display panel 2A modulates blue light and yellow light from the light source unit 1A. The liquid crystal display panel 2B modulates green light from the light source unit 1B. The liquid crystal display panel 2C modulates red light and cyan light from the light source unit 1C. A signal for driving each liquid crystal display panel is generated by the control unit 5 described later.

  The dichroic prism 3 synthesizes the light modulated by each liquid crystal display panel and guides it to the projection lens 4. The dichroic prism 3 reflects the red light and the cyan light, and transmits the green light, the blue light, and the yellow light. The first wavelength selective reflection film 3A reflects the blue light and the yellow light and reflects the green light. A second wavelength selective reflection film 3B that transmits light, red light, and cyan light is provided. By this dichroic prism 3, the respective color lights from the light source unit 1 </ b> A, the light source unit 1 </ b> B, and the light source unit 1 </ b> C are combined and guided to the projection lens 4.

  The projection lens 4 enlarges and projects the light combined by the dichroic prism 3 so as to form an image on a screen (not shown). That is, each liquid crystal display panel controls the amount of each color component light projected onto the screen in accordance with the video signal.

  The control unit 5 performs light emission control of each light source of the liquid crystal display panels 2A to 2C and the light source unit 1 according to the video signal. FIG. 2 shows the configuration of the control unit 5. The control unit 5 includes a video information calculation unit 51 that calculates video information such as luminance and saturation from the RGB video signal input to the projection video display device 10, and the liquid crystal display panels 2A to 2C based on the RGB input video signal. A liquid crystal display panel control unit 52 that generates a signal for driving the light source, and a light emission control unit that performs light emission control on each of the LED light sources 11 of the light source units 1A to 1C based on the video information calculated by the video information calculation unit 51 53.

  The light emission control unit 53 performs the light emission control of the blue LED light source 11b and the yellow LED light source 11y of the light source unit 1A, and the light emission control of the green LED light sources 11g and 11g ′ of the light source unit 1B. A light emission control unit 53B and a light emission control unit 53C that performs light emission control of the red LED light source 11r and the cyan LED light source 11c of the light source unit 1C are provided. Each of the light emission control units 53 includes light emission time determination units 54A, 54B, and 54C that determine the light emission time of each LED light source based on information such as luminance and saturation obtained from the calculation by the video information calculation unit 51, and LED light sources. ON / OFF signal generators 55A, 55B, and 55C that generate ON / OFF signals for output to an LED light source driving circuit (not shown) for driving the LED.

  FIG. 3 shows an example of a time chart of control performed by the light emission control unit 53. Frame (1) shows a light emission pattern when displaying white light. Frame (2) shows a light emission pattern when displaying an image of one arbitrary frame. The blue LED light source 11b and the yellow LED light source 11y of the light source unit 1A are alternately emitted within a frame period (for example, 1/60 second) of the video signal. Similarly, the green LED light sources 11g and 11g ′ of the light source unit 1B are alternately emitted within the frame period of the video signal, and the red LED light source 11r and the cyan LED light source 11c of the light source unit 1C are frame periods of the video signal. The light is emitted alternately.

  The light emission time determination unit 54A in the light emission control unit 53A determines the light emission time of the blue LED light source 11b and the yellow LED light source 11y that are in a complementary color relationship. For example, when it is determined that the blue saturation (purity) is higher than the calculated video information, the light emission time of the LED light source 11b is set longer. On the other hand, when it is determined that the luminance of blue is high and the saturation is low, the light emission time of the LED light source 11y is set longer. The light emission time determination unit 54B of the light emission control unit 53B determines the light emission times of the green LED light source 11g and the LED light source 11g '. In addition, the light emission time determination unit 54C of the light emission control unit 53C determines the light emission times of the red LED light source 11r and the cyan LED light source 11c that are in a complementary color relationship.

(Procedure for determining the emission time of each light source: Part 1)
A procedure for determining the light emission time of each light source when displaying an image of arbitrary chromaticity will be described with reference to the chromaticity diagram of FIG. The projection display apparatus 10 actually has only five light sources other than the magenta color, but here, in order to simplify the discussion, it is assumed that a magenta color light source exists. In this chromaticity diagram, points R, G, B, C, M, and Y are red, green, blue, cyan, magenta, and yellow, respectively, with a color purity of 100%. Here, it is assumed that the average chromaticity (average chromaticity of each pixel of one frame image) of a video signal can be expressed as a point P on this chromaticity diagram. Here, if the length of the line segment PB is a and the length of the line segment PY is b, the light emission time tb of the LED light source 11b and the light emission time ty of the LED light source 11y are based on the sizes of a and b. Can be determined. For example, the ratio of the light emission time of each light source
tb / ty ｂ b / a
Can be determined.

(Procedure for determining the emission time of each light source: Part 2)
The example described using the chromaticity diagram of FIG. 8 is a simple case where the chromaticity of the video signal is on a line segment connecting the primary color and the complementary color. Hereinafter, a method for determining the light emission time of each light source when the chromaticity is not on the line segment connecting the primary color and the complementary color will be described.

  In the chromaticity diagram of FIG. 9, when the point representing white is W, the point representing blue is B, and the point representing cyan is Cy, the point Q is inside the triangle BWCy. In this case, light of chromaticity Q can be expressed using a blue LED light source 11b, a yellow LED light source 11y, a red LED light source 11r, and a cyan LED light source 11c.

  Specifically, (i) First, the light emission time ratio between the LED light source 11r and the LED light source 11c and the light emission time ratio between the LED light source 11b and the LED light source 11y are determined. (ii) Next, the light emission times of these four light sources are determined (however, the light emission time ratio is fixed to the ratios r1 and r2 determined in (i)).

  First, (i) will be described. The light emission time ratio rat1 between the LED light source 11r and the LED light source 11c is obtained as an intersection R ′ between a straight line passing through the point Q and parallel to the line segment BCy and the line segment CyW, the distance c1 between the intersection point R ′ and the point Cy, and the intersection point. And the distance r1 between the point R and the point R can be determined. On the other hand, the light emission time ratio rat2 between the LED light source 11b and the LED light source 11y is obtained as an intersection B ′ between a straight line passing through the point Q and parallel to the line segment BCy and the line segment BW, and a distance b1 between the intersection B ′ and the point B, It can be determined based on the distance y1 between the intersection and the point Y. Note that the chromaticity that can be expressed when the light emission time ratio between the LED light source 11r and the LED light source 11c is rat1 and the light emission time ratio between the LED light source 11b and the LED light source 11y is rat2, is any color on the line segment B′R ′. Degree.

  Next, (ii) will be described. Here, the light emission time of each light source is determined while the light emission time ratios rat1 and rat2 determined above are fixed. Thereby, the chromaticity on the line segment B′R ′ can be determined. For example, when the chromaticity Q is close to the chromaticity B ′, the light emission times of the LED light source 11b and the LED light source 11y may be set longer, and the light emission times of the LED light source 11r and the LED light source 11c may be set shorter. When the chromaticity Q is close to the chromaticity R ′, the light emission times of the LED light source 11b and the LED light source 11y may be set shorter, and the light emission times of the LED light source 11r and the LED light source 11c may be set longer.

  With the above procedure, the light emission time of each light source when the chromaticity obtained from the video signal is Q in the chromaticity diagram of FIG. 9 can be determined.

(Procedure for determining the emission time of each light source: Part 3)
Next, a case where an image having a chromaticity indicated by Q in the chromaticity diagram of FIG. 10 is displayed will be described.
In FIG. 10, when the point representing white is W, the point representing green is G, and the point representing yellow is Y, the point Q is inside the triangle GWY. In this case, light of chromaticity Q can be expressed using a blue LED light source 11b, a yellow LED light source 11y, and a green LED light source 11g. 9 is different from the example in FIG. 9 in that the example in FIG. 9 is expressed using light sources of four colors, whereas this example is an example expressed using light sources of three colors. . This is because the magenta color, which is the complementary color of green, is not a single color, so there is no so-called magenta color LED light source, and therefore it must be expressed in three colors excluding magenta.

  Specifically, (i) First, the light emission time ratio r3 between the LED light source 11b and the LED light source 11y is determined. (ii) Next, the light emission times of the three light sources are determined (however, the light emission time ratio is fixed to the ratio r3 determined in (i)).

  First, (i) will be described. The light emission time ratio rat3 between the LED light source 11b and the LED light source 11y is obtained by calculating an intersection Y ′ between the line segment BCy and the line segment BY passing through the point Q and the point G, the distance b2 between the intersection point Y ′ and the point B, and the intersection point. It can be determined based on the distance y2 of the point Y. Note that the chromaticity that can be expressed when the light emission time ratio rat3 between the LED light source 11b and the LED light source 11y is any chromaticity on the line segment GY ′.

  Next, (ii) will be described. Here, the light emission time of each light source is determined while the light emission time ratio rat3 determined above is fixed. As a result, the chromaticity on the line segment GY ′ can be determined. For example, when the chromaticity Q is close to the chromaticity G, the light emission time of the LED light source 11g may be set longer, and the light emission times of the LED light source 11b and LED light source 11y may be set shorter. When the chromaticity Q is close to the chromaticity Y ′, the light emission time of the LED light source 11g may be set shorter, and the light emission times of the LED light source 11b and LED light source 11y may be set longer.

  With the above procedure, the light emission time of each light source can be determined when the chromaticity obtained from the video signal is Q in the chromaticity diagram of FIG.

(Determining the light emission time of each light source: Part 4)
The above (No. 1 to No. 3) has been described with a simple example in which an image of one chromaticity (an image of one pixel) is displayed. Actually, pixels of various chromaticities exist in the video signal for one frame. Therefore, in the following (No. 4 and No. 5), a procedure for determining the light emission time of each light source when displaying an image composed of pixels of various chromaticities will be described.

  Here, there are two possible cases: light emission control based on the saturation information obtained from the video signal and light emission control based on the luminance information. First, a case where light emission control is performed based on saturation information will be described.

  (I) First, the maximum saturation values (hereinafter referred to as “video maximum saturation”) Cr, Cb, and Cg in the hues of red, blue, and green are calculated from the video signal. For example, the red video maximum saturation Cr in FIG. 4 can be calculated as follows. First, a red luminance value Lr (x, y), a green luminance value Lg (x, y), and a blue luminance value Lb (x, y) in each pixel (x, y) of an RGB signal representing an image of one frame are examined. . In each signal of red luminance value at each pixel (x, y), the red luminance value Rmax of the pixel having the maximum red luminance, the green luminance value Gmax of the pixel having the maximum green luminance, and the maximum blue luminance are obtained. The blue luminance value Bmax of the pixel with which it has is examined. Then, among these Rmax, Gmax, and Bmax, the luminance value Pmax of the pixel having the maximum luminance and the luminance value Pmin of the pixel having the minimum luminance are examined. (Pmax−Pmin) / Pmax is calculated with respect to Pmax and Pmin thus obtained. This calculation result is the maximum image saturation.

  (Ii) Then, the light emission times of the light sources of the three primary colors and the light sources having a complementary color relationship with the light sources of the three primary colors are determined according to the magnitude of the maximum image saturation calculated in (i). For example, when Rmax is the largest among Rmax, Gmax, and Bmax and the maximum image saturation is large, the color purity of red is high. Therefore, the light emission time of cyan, which is complementary color light, is shortened, and the red light source Make the flashing time longer. On the other hand, when the maximum image saturation in red is small, the color purity of red is low, so that a cyan light source that is complementary color light is emitted for a relatively long time in addition to the red light source.

(Procedure for determining the emission time of each light source: Part 5)
Next, a case where light emission control is performed based on luminance information obtained from a video signal will be described.

  (Iii) First, a theoretical maximum luminance (hereinafter, “theoretical maximum luminance” is defined in advance. The theoretical maximum luminance is determined as follows. First, red light in the projection display apparatus 10, Assuming that the ratio of green light to blue light is a ratio that takes into account the human's specific visual sensitivity characteristics (for example, 3: 6: 1), the theoretical maximum luminance in the red, green, and blue hues is The intermediate color such as cyan and yellow can be expressed by combining the three primary colors, for example, in the case of yellow, it can be expressed by combining the red light and the green light. The theoretical maximum brightness is the sum of the theoretical maximum brightness of red and the theoretical maximum brightness of green, and similarly, the theoretical maximum brightness of cyan is the sum of the theoretical maximum brightness of blue and the theoretical maximum brightness of green.

  (Iv) Next, the maximum video luminance is calculated. Here, the maximum video luminance means the maximum luminance value in each hue of the video signal. For example, the maximum luminance of red video corresponds to the luminance value of the pixel having the maximum luminance (the same as Rmax described above) in the R signal of the RGB signal representing an image of one frame. The maximum luminance of blue and green images can be obtained in the same manner.

  (V) Next, the difference between the theoretical maximum brightness defined in (iii) and the video maximum brightness calculated in (iv) is calculated.

(Vi) Then, the light emission time corresponding to the magnitude of the difference value between the maximum image luminance and the theoretical maximum luminance calculated in (v) is determined. For example, as shown in FIG. 5, when the difference value at the red wavelength is A1 and the difference value at the cyan wavelength is A2, the emission time Tr of the red LED light source 11r incident on the liquid crystal display panel 2C and the cyan LED 11c The light emission times Tc of the
Tr = 1-A1 / (A1 + A2)
Tc = 1-A2 / (A1 + A2)
It is determined as follows. Note that the above equation is normalized by the time of one frame period.

(Action / Effect)
(1) According to the projection display apparatus 10 described above, first, cyan and yellow light sources are employed in addition to the red, blue and green light sources. As a result, as shown in FIG. 6, the theoretical maximum luminance for colors other than the three primary colors such as yellow and cyan is improved, and the color reproducibility is improved. As in the prior art, when only three light sources of red, blue, and green are used, it is necessary to generate cyan, yellow, and color by combining two of the three primary colors. For example, when generating yellow light, it is necessary to synthesize red light and green light. However, if the view is changed, it can be said that yellow light is generated by subtracting blue component light from white light. That is, when a three-color light source is used, intermediate colors such as yellow are expressed by subtractive color . On the other hand, according to the projection display apparatus 10, yellow can be expressed by so-called additive color. Therefore, the brightness of the intermediate color can be improved.

  (2) The projection display apparatus 10 controls the light emission time of the light source in addition to modulation by the liquid crystal display panels 2A to 2C when displaying an image. Thereby, for example, when displaying a dark image, the light emission of the light source can be suppressed, and the power consumption can be reduced. Further, since the gradation of the image is expressed by both the liquid crystal display panel and the light emission time of the light source, the gradation can be increased.

  (3) In the projection display apparatus 10, two colors having complementary colors are alternately incident on the same liquid crystal display panel. Since white light can be generated by combining two colors having complementary colors, white balance control can be performed independently for each panel. Therefore, as compared with the case where a light source having a color that is not complementary to the three primary colors is used, calculation for white balance control of the entire projection display apparatus 10 can be easily performed. The white balance control method in the projection display apparatus 10 will be described in detail later.

  (4) In the projection display apparatus 10, the red and cyan light emission control circuits are shared, the green light source drive circuit is shared, and the blue and yellow light source drive circuits are shared. The circuit is miniaturized.

  (5) In the projection display apparatus 10, the color that emits light in the first and second half of the frame is set so that the color of the combined light is white, so that an image that does not give the user a sense of incongruity can be displayed. When the combined light of the colors emitted in the first half of the frame is not white (that is, when the synthesized color in the first half of the frame is different from the synthesized color in the second half of the frame), a color break phenomenon occurs and the image gives a sense of discomfort to the user Because it becomes.

(Modification of the first embodiment)
Note that the projection display apparatus 10 is provided with three light emission control units 53A to 53C corresponding to the light source groups incident on the three liquid crystal display panels 2A to 2C, respectively. On the other hand, you may provide six light emission control parts each corresponding to six types of LED light sources. In this case, the cost and circuit scale increase as the number of light emission control units increases, but it is not necessary to perform control to alternately emit two colored lights incident on the same liquid crystal display panel, and the two colored lights are simultaneously emitted. Since it can enter into the same liquid crystal display panel, it becomes possible to increase the brightness of the projection display apparatus.

  In the projection display apparatus 10, an LED light source is used as the light source, but other light sources such as a laser light source may be adopted instead.

  The light emission control unit 53 may cause the red, blue, and green LED light sources to emit light in the first half of the frame period, and may cause the yellow, cyan, and green LED light sources to emit light in the second half of the frame period. Then, the emission color may be set so that both the first half and the second half of the frame period are white. Thereby, it is possible to display a video that does not give the user a sense of incongruity.

(White balance control method)
With reference to the chromaticity diagram of FIG. 11, a white balance control procedure by the projection display apparatus 10 will be described. Assume that the chromaticity range of the input video signal (for example, one frame image) is Q in FIG. In this case, first, a triangle G′B′R ′ having the largest area among the triangles that include the entire range Q and that are similar to the triangle GBR is obtained. At this time, the light emission times of the red LED light source 11r and the cyan LED light source 11c are determined based on the length of the line segment RR ′ and the length of the line segment CR ′. Similarly, the light emission times of the blue LED light source 11b and the yellow LED light source 11y are determined based on the length of the line segment BB ′ and the length of the line segment MB ′. According to this procedure, (1) white balance control in video display can be performed, and (2) high luminance can be achieved by using other light sources in addition to the three primary color light sources of RGB.

<Second Embodiment>
FIG. 7 is a diagram showing a configuration of the projection display apparatus 20. The projection display apparatus 20 includes light source units 8A to 8C, liquid crystal display panels 22A to 22C as light modulation units, a dichroic prism 23 as a color synthesis unit, a projection lens 24, a control unit 25, and the like.

  The light source unit 8A includes LED light sources 81b and 82b that emit blue light. The light source unit 8B includes LED light sources 81g and 82g that emit green light. The light source unit 8C includes LED light sources 81r and 82r that emit red light.

  The blue LED light sources 81b and 82b are both LED light sources that emit blue light, but have different color purity and efficiency. The color purity is, for example, saturation. In addition, the efficiency here means the output of the LED per LED driving power (current). If the efficiency is high, the power consumption can be reduced. Of the two blue LED light sources, the light purity is high for the light source 82b and the light source 81b is excellent for the light emission efficiency. Note that the color purity and efficiency of LED light sources of other colors are also different.

  The configurations and functions of the dichroic prism 23 and the projection lens 24 are the same as those of the dichroic prism 3 and the projection lens 4 of the first embodiment, and thus description thereof is omitted here.

  The control unit 25 performs modulation control of the light transmittance of the liquid crystal display panels 22A to 22C according to the video signal, and also performs light emission control of the LED light source. Similar to the control unit 5 of the first embodiment, the control unit 25 is calculated by a video information calculation unit that analyzes an input RGB video signal, a liquid crystal display panel control unit that controls each liquid crystal display panel, and a video information calculation unit. And a light emission control unit that performs light emission control of each light source unit based on the image information.

  For example, when the video information calculation unit determines that the RGB video signal has a high blue purity, the light emission control unit lengthens the light emission time of the LED light source 82b with excellent color purity and shortens the light emission time of the LED light source 81b. (Or zero). On the contrary, when the luminance of blue is high, but it is determined that the purity is high, the light emission time of the LED light source 81b having excellent light emission efficiency is set longer.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and is intended to include meanings equivalent to the scope of claims for patent and all modifications within the scope.

<Modification>
In each of the embodiments described above, the light integration means for providing a uniform luminance distribution within the panel surface of the liquid crystal display panel is provided. Instead of this, an optical integration means for dividing and irradiating a plurality of regions may be provided.

  In the projection-type image display device 10 described above, the LED light sources 11g and 11g ′ emitting green light are arranged in the light source unit 1B. Instead of the light source 11g ', a red light source and a blue light source may be arranged, and these may be combined at a predetermined ratio to emit magenta color light. By doing so, a projection-type image display apparatus using six-color light can be realized, color reproducibility is further improved, and white balance control is further facilitated. However, in this case, considering the characteristics of the wavelength selective reflection film of the dichroic prism 3, the blue light source wavelength of the light source unit 1B is slightly different from the blue light source wavelength of the light source unit 1A. Should be slightly different from the red light source wavelength of the light source unit 1C.

1 is a diagram showing a configuration of a projection display apparatus 10. FIG. 3 is a diagram illustrating a configuration of a control unit 5. It is the figure which showed the example of a time chart of the control which the light emission control part 53 performs. It is the figure which showed the example of calculation of image | video maximum saturation. It is the figure which showed the example of calculation of image | video maximum brightness | luminance. It is the figure which compared the ideal maximum brightness | luminance of the video display apparatus by the light source of three primary colors, and the projection type video display apparatus 10 by a 6 color light source. 2 is a diagram illustrating a configuration of a projection display apparatus 20. FIG. 4 is a chromaticity diagram for explaining light emission control of the projection display apparatus 10. FIG. 4 is a chromaticity diagram for explaining light emission control of the projection display apparatus 10. FIG. 4 is a chromaticity diagram for explaining light emission control of the projection display apparatus 10. FIG. 4 is a chromaticity diagram for explaining light emission control of the projection display apparatus 10. FIG.

Explanation of symbols

1A to 1C Light source units 2A to 2C Liquid crystal display panel 3 Dichroic prism 4 Projection lens 5 Control unit 51 Video information calculation unit 52 Liquid crystal display panel control unit 53 Light emission control unit

Claims (2)

First, second, and third light sources that emit red light, blue light, and green light, respectively;
First, second, and third light modulation means for modulating light from each of the light sources according to a video signal,
Light synthesizing means for synthesizing the light modulated by each of the light modulation means;
In a projection display apparatus comprising light projection means for projecting light synthesized by the light synthesis means,
The first, the fourth light source emitting colored light is substantially complementary relationship with any two of the one light source of the second or third light sources,
A fifth light source that emits colored light that is substantially complementary to the other light source of any two of the first, second, or third light sources;
A light emission control means for controlling light emission of the first, second, third, fourth or fifth light source;
The light from the fourth light source, the fourth light source and the first in a substantially complementary colors, light for modulating light from any two of the one light source of the second or third light source Incident on the modulation means,
The light from the fifth light source is light for modulating the light from the other one of the first, second, and third light sources that is substantially complementary to the fifth light source. Incident on the modulation means,
The light emission control means has the first, second, or third relationship that is substantially complementary to the light of the fourth light source and the light of the fourth light source, depending on the luminance or saturation of the video signal. controls the respective light emission time of the one of the two one light source light of the light source, the light of the fifth light source, the first in the nearly complementary color of the light of the fifth light source, the Controlling the respective light emission times with the light of the other light source of either the second light source or the third light source ,
A projection-type image display apparatus, wherein white balance control is performed independently for each of the light modulation means. It said light emission control means includes a fourth light source, the first in the nearly complementary color relationship and the fourth light source emit light alternately and any two of the one light source of the second or third light source And the fifth light source and the other one of the first, second, and third light sources that are substantially complementary to the fifth light source are alternately caused to emit light. The projection display apparatus according to claim 1, wherein the projection type display unit is incident on a modulation unit.