JP5205143B2 - Projection display device - Google Patents

Description

  The present invention relates to a projection display apparatus that uses fourth color component light in addition to red component light, green component light, and blue component light.

  2. Description of the Related Art Conventionally, a three-plate projection image display apparatus generally includes a red liquid crystal panel that modulates red component light, a green liquid crystal panel that modulates green component light, and a blue liquid crystal panel that modulates blue component light. Are known.

  In addition to a red component light, a green component light, and a blue component light, there is also a projection display apparatus that uses a fourth color component light (for example, a yellow component light) for the purpose of improving luminance and reducing power consumption. It has been proposed (for example, Patent Document 1).

Specifically, in a projection display apparatus, the brightness of an image projected on a screen is improved by using yellow component light in addition to red component light, green component light, and blue component light. ing.
JP 2002-287247 A (Claim 1, Claim 4, FIG. 1, etc.)

  However, in the above-described projection display apparatus, simply adding yellow component light lowers the color temperature of the white point. That is, the optimum white balance is lost.

  SUMMARY An advantage of some aspects of the invention is that it provides a projection display apparatus that can maintain an optimal white balance.

The projection display apparatus according to the first feature includes a red modulation element (liquid crystal panel 30R) that modulates red component light in response to a red input signal, and a green modulation element (modulation that modulates green component light in response to a green input signal). A liquid crystal panel 30G) and a blue modulation element (liquid crystal panel 30B) that modulates the blue component light in response to the blue input signal, and the fourth one of the red component light, the green component light, and the blue component light. Superimposes color component light. The projection display apparatus includes a control unit (control unit 130) that controls a luminance priority mode that prioritizes the luminance of the video and a color balance priority mode that prioritizes the color balance of the video. In the luminance priority mode, the control unit performs non-adjacent color component light and adjacent color component light when the saturation of the image calculated based on the red input signal, the green input signal, and the blue input signal is lower than a predetermined saturation. Do not decrease the amount of light at least. When the saturation of the image is higher than the predetermined saturation, the control unit performs at least one of the light amount correction processing of the non-adjacent color component light and the light amount correction processing of the adjacent color component light as the fourth color component. This is based on the amount of light superposition. The non-adjacent color component light is color component light having a hue that is not adjacent to the hue of the fourth color component light among the red component light, the green component light, and the blue component light. The adjacent color component light is color component light having a hue adjacent to the hue of the fourth color component light among the red component light, the green component light, and the blue component light .

  According to such a feature, the control unit controls the luminance priority mode and the color balance priority mode. Therefore, even when the fourth color component light is used, the optimal white balance is maintained when the color balance should be maintained. Can be maintained.

  In the above-described feature, the control unit superimposes the saturation of the image and the fourth color component light calculated based on the red input signal, the green input signal, and the blue input signal in the color balance priority mode. Based on the amount, at least one of the light amount correction processing of the non-adjacent color component light and the light amount correction processing of the adjacent color component light is performed. The non-adjacent color component light is color component light having a hue that is not adjacent to the hue of the fourth color component light among the red component light, the green component light, and the blue component light. The adjacent color component light is color component light having a hue adjacent to the hue of the fourth color component light among the red component light, the green component light, and the blue component light.

  In the above-described feature, the control unit corrects a non-adjacent color signal corresponding to the non-adjacent color component light among the red input signal, the green input signal, and the blue input signal, thereby correcting the non-adjacent color. A signal correction unit (mode control unit 135) that performs light amount correction processing of component light is included.

  In the above-described feature, the control unit corrects an adjacent color signal corresponding to the adjacent color component light among the red input signal, the green input signal, and the blue input signal, thereby correcting the adjacent color component light. A signal correction unit (mode control unit 135) that performs light amount correction processing is included.

  In the above-described feature, the control unit performs a light amount correction process for the non-adjacent color component light by correcting the light amount of the non-adjacent color component light before the modulation of the non-adjacent color component light. (Mode control unit 135a).

  In the above-described feature, the control unit corrects the light amount of the adjacent color component light before modulating the adjacent color component light, thereby performing a light amount correction unit (mode control) for correcting the light amount of the adjacent color component light. Part 135a).

  In the above-described feature, white balance is optimized based on a case where the amount of superimposition of the fourth color component light is maximum. The light amount correction process for the non-adjacent color component light is a process for reducing the light amount of the non-adjacent color component light as the amount of superimposition of the fourth color component light decreases.

  In the above-described feature, white balance is optimized based on a case where the amount of superimposition of the fourth color component light is minimum. The light amount correction processing for the non-adjacent color component light is processing for increasing the light amount of the non-adjacent color component light as the amount of superimposition of the fourth color component light decreases.

  ADVANTAGE OF THE INVENTION According to this invention, the projection type video display apparatus which makes it possible to maintain an optimal white balance can be provided.

  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.

[First Embodiment]
(Outline of projection display device)
Hereinafter, an outline of the projection display apparatus according to the first embodiment will be described with reference to the drawings. FIG. 1 is a diagram showing an outline of a projection display apparatus 100 according to the first embodiment. As will be described later, the projection display apparatus 100 uses yellow component light as the fourth color component light in addition to the red component light, the green component light, and the blue component light.

  In FIG. 1, it should be noted that a fly-eye lens that homogenizes the light emitted from the light source 10, a PBS (Polarized Beam Splitter) that aligns the polarization direction of the light emitted from the light source 10, and the like are omitted.

  As shown in FIG. 1, the projection display apparatus 100 includes a light source 10, a plurality of liquid crystal panels 30 (a liquid crystal panel 30R, a liquid crystal panel 30G, a liquid crystal panel 30B, and a liquid crystal panel 30Ye), a cross dichroic cube 60, and a projection. A lens unit 110.

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

  As described above, the yellow component light is the fourth color component light. Yellow component light is superimposed on either red component light or green component light, or both red component light and green component light.

  In the first embodiment, the yellow component light is superimposed on the green component light and enters the liquid crystal panel 30G. Blue component light is non-adjacent color component light having a hue that is not adjacent to the hue of yellow component light. Red component light and green component light are adjacent color component lights having a hue adjacent to the hue of yellow component light.

As will be described later, the liquid crystal panel 30R modulates red component light in accordance with a red input signal (specifically, a red output signal R _out calculated from the red input signal R _in ). A pair of polarizing plates 31R and 32R are provided on the light incident side and the light emitting side of the liquid crystal panel 30R.

Similarly, the liquid crystal panel 30G modulates the green component light according to the green input signal (specifically, the green output signal G _out calculated from the green input signal G _in ), and the liquid crystal panel 30B receives the blue input. The blue component light is modulated in accordance with the signal (specifically, the blue output signal B _out calculated from the blue input signal B _in ). A pair of polarizing plates 31G and 32G and a pair of polarizing plates 31B and 32B are provided on the light incident side and the light emitting side of the liquid crystal panel 30G and the liquid crystal panel 30B.

On the other hand, the liquid crystal panel 30Ye modulates the yellow component light according to the yellow control signal (specifically, the yellow output signal Ye _out ) calculated based on the red input signal, the green input signal, and the blue input signal. To do. A polarizing plate (not shown) may be provided on at least one of the light incident side and the light emitting side of the liquid crystal panel 30Ye. ,
The light emitted from the liquid crystal panel 30Ye enters the liquid crystal panel 30G. That is, the liquid crystal panel 30G is provided on the optical path of the light emitted from the liquid crystal panel 30Ye until the light emitted from the liquid crystal panel 30Ye enters the cross dichroic cube 60.

It should be noted that the control of the modulation amount of the liquid crystal panel 30Ye is control of the amount of yellow component light transmitted through the liquid crystal panel 30Ye. That is, the control of the modulation amount of the liquid crystal panel 30Ye is the control of the superposition amount of the yellow component light superimposed on the red component light. The yellow output signal Ye _out is a signal indicating the modulation amount of the liquid crystal panel 30Ye.

  Here, the resolution of the liquid crystal panel 30Ye is different from the resolution of the liquid crystal panel 30R, the liquid crystal panel 30G, and the liquid crystal panel 30B. Specifically, in order to display a high-definition image on a screen (not shown), the liquid crystal panel 30R, the liquid crystal panel 30G, and the liquid crystal panel 30B have high resolution. On the other hand, the light emitted from the liquid crystal panel 30Ye is mainly used as illumination light. Therefore, it is preferable that the resolution of the liquid crystal panel 30Ye is lower than the resolution of the liquid crystal panel 30R, the liquid crystal panel 30G, and the liquid crystal panel 30B so that the light utilization efficiency is not reduced by the electrodes provided in the liquid crystal panel. Moreover, since it is sufficient that the amount of yellow component light can be adjusted for each target region, it is sufficient that the resolution of the liquid crystal panel 30Ye is low.

  Note that the low resolution is a concept including that the liquid crystal panel 30Ye does not have the resolution. Therefore, the liquid crystal panel 30Ye does not have to be configured so that the modulation amount can be controlled for each of the plurality of regions, and may have a configuration in which only the modulation amount on the entire surface is controlled.

  The resolution of the liquid crystal panel 30Ye may be the same as the resolution of the liquid crystal panel 30R, the liquid crystal panel 30G, and the liquid crystal panel 30B.

  The cross dichroic cube 60 is a color combining unit that combines light emitted from the liquid crystal panel 30R, the liquid crystal panel 30G, and the liquid crystal panel 30B. That is, the cross dichroic cube 60 combines the red component light and yellow component light emitted from the liquid crystal panel 30R, the green component light emitted from the liquid crystal panel 30G, and the blue component light emitted from the liquid crystal panel 30B. The cross dichroic cube 60 emits combined light (image light) including red component light, green component light, blue component light, and yellow component light to the projection lens unit 110 side.

  The projection lens unit 110 projects the combined light (image light) combined by the cross dichroic cube 60 onto a screen (not shown).

  Returning to FIG. 1, the projection display apparatus 100 has a plurality of mirror groups (mirrors 21 to 25). The mirror 21 is a dichroic mirror that transmits light including blue component light, green component light, and yellow component light, and reflects red component light. The mirror 22 is a mirror that reflects red component light toward the liquid crystal panel 30R. The mirror 23 is a dichroic mirror that reflects other light including green component light and yellow component light to the liquid crystal panel 30G side and transmits blue component light. The mirror 24 and the mirror 25 are mirrors that reflect blue component light toward the liquid crystal panel 30B.

  Here, the mirror 21 and the mirror 23 constitute a color separation unit that separates light emitted from the light source 10 into red component light, green component light, and blue component light. As described above, the yellow component light is superimposed on the green component light.

  The projection display apparatus 100 includes a phase difference plate 50 that rotates the polarization direction of yellow component light by 90 °. Specifically, the phase difference plate 50 rotates the polarization direction of the yellow component light, which has the same polarization direction as that of the green component light, to emit the yellow component light toward the liquid crystal panel 30G.

  Whether or not the phase difference plate 50 is provided is arbitrary. As described below, it should be noted that the voltage applied to the liquid crystal panel 30Ye is controlled by the type of the liquid crystal panel 30Ye and the presence or absence of the phase difference plate 50.

  Specifically, when the polarization direction of yellow component light emitted from the liquid crystal panel 30Ye is different from the polarization direction of green component light incident on the liquid crystal panel 30G, a polarizing plate provided on the incident side of the liquid crystal panel 30G As a result, yellow component light is shielded.

  Therefore, whether or not to apply a voltage to the liquid crystal panel 30Ye is controlled by the relationship between the voltage application state and the polarization rotation. In the following, the first type liquid crystal panel that rotates the polarization direction with no voltage applied, and does not rotate with the voltage applied, and the polarization direction with no voltage applied. The second type liquid crystal panel that rotates the polarization direction in a state where a voltage is applied without applying voltage will be described as an example.

(1) Case where the liquid crystal panel 30Ye is the first type (1-1) Case where the phase difference plate 50 is not provided When the yellow component light is turned off, no voltage is applied to the liquid crystal panel 30Ye. Accordingly, since the liquid crystal panel 30Ye rotates the polarization direction of the yellow component light, the polarization direction of the yellow component light is different from the polarization direction of the green component light. That is, the yellow component light is shielded by the polarizing plate provided on the incident side of the liquid crystal panel 30G.

  In order to turn on the yellow component light, a voltage is applied to the liquid crystal panel 30Ye. Accordingly, since the liquid crystal panel 30Ye does not rotate the polarization direction of the yellow component light, the polarization direction of the yellow component light becomes the same as the polarization direction of the green component light.

(1-2) Case in which the retardation plate 50 is provided When the yellow component light is turned off, a voltage is applied to the liquid crystal panel 30Ye. Accordingly, after the phase difference plate 50 rotates the polarization direction of the yellow component light, the liquid crystal panel 30Ye does not rotate the polarization direction of the yellow component light, so the polarization direction of the yellow component light is different from the polarization direction of the green component light. It will be. That is, the yellow component light is shielded by the polarizing plate provided on the incident side of the liquid crystal panel 30G.

  When the yellow component light is turned on, no voltage is applied to the liquid crystal panel 30Ye. Thus, after the phase difference plate 50 rotates the polarization direction of the yellow component light, the liquid crystal panel 30Ye further rotates the polarization direction of the yellow component light. Be the same.

(2) Case where the liquid crystal panel 30Ye is the second type (2-1) Case where the phase difference plate 50 is not provided When the yellow component light is turned off, a voltage is applied to the liquid crystal panel 30Ye. Accordingly, since the liquid crystal panel 30Ye rotates the polarization direction of the yellow component light, the polarization direction of the yellow component light is different from the polarization direction of the green component light. That is, the yellow component light is shielded by the polarizing plate provided on the incident side of the liquid crystal panel 30G.

  When the yellow component light is turned on, no voltage is applied to the liquid crystal panel 30Ye. Accordingly, since the liquid crystal panel 30Ye does not rotate the polarization direction of the yellow component light, the polarization direction of the yellow component light becomes the same as the polarization direction of the green component light.

(2-2) Case in which the phase difference plate 50 is provided When the yellow component light is turned off, no voltage is applied to the liquid crystal panel 30Ye. Accordingly, after the phase difference plate 50 rotates the polarization direction of the yellow component light, the liquid crystal panel 30Ye does not rotate the polarization direction of the yellow component light, so the polarization direction of the yellow component light is different from the polarization direction of the green component light. It will be. That is, the yellow component light is shielded by the polarizing plate provided on the incident side of the liquid crystal panel 30G.

In order to turn on the yellow component light, a voltage is applied to the liquid crystal panel 30Ye. Thus, after the phase difference plate 50 rotates the polarization direction of the yellow component light, the liquid crystal panel 30Ye further rotates the polarization direction of the yellow component light, so that the polarization direction of the yellow component light becomes the polarization direction of the green component light. Be the same.

  Here, Table 1 summarizes the relationship between the voltage application state and the polarization rotation described above.

(Chromaticity diagram)
Hereinafter, the chromaticity diagram according to the first embodiment will be described with reference to the drawings. FIG. 2 is a diagram illustrating a chromaticity diagram according to the first embodiment.

  As shown in FIG. 2, the hue and saturation of each color are represented by a chromaticity coordinate axis X and a chromaticity coordinate axis Y. In FIG. 2, a range surrounded by a solid line is a color reproduction range in a case where the superimposed amount of yellow component light is minimum (hereinafter, the minimum case). A range surrounded by a dotted line is a color reproduction range in a case where the superimposed amount of yellow component light is maximum (hereinafter, the maximum case). WP is a white point (point with the highest color temperature) optimized in the minimum case and the maximum case.

  In the first embodiment, red (R), green (G), blue (B), and yellow (Ye) are considered. Therefore, red (R) and green (G) have a hue adjacent to yellow (Ye). Blue (B) has a hue that is not adjacent to yellow (Ye). As a broad interpretation, it is considered that the complementary color of red (R) is cyan (Cy), the complementary color of green (G) is magenta (Mg), and the complementary color of blue (B) is yellow (Ye).

  As shown in FIG. 3, the color reproduction range of the maximum case is narrower than the color reproduction range of the minimum case. That is, the color reproduction range is reduced as the amount of yellow component light superimposed increases. In the first embodiment, since the yellow component light is superimposed on the green component light, the color reproduction range is reduced mainly in the green (G) hue.

(Function of projection display device)
Hereinafter, functions of the projection display apparatus according to the first embodiment will be described with reference to the drawings. FIG. 3 is a block diagram showing functions of the projection display apparatus 100 (control unit 130) according to the first embodiment.

  As illustrated in FIG. 3, the control unit 130 includes an input signal reception unit 131, a Ye replacement component calculation unit 132, a parameter identification unit 133, a Ye component adjustment unit 134, and a mode control unit 135.

The input signal receiving unit 131 acquires a red input signal R _in , a green input signal G _in, and a blue input signal B _in . The input signal receiving unit 131 inputs the red input signal R _in , the green input signal G _in, and the blue input signal B _in to the parameter specifying unit 133. The input signal receiving unit 131 inputs the red input signal R _in and the green input signal G _in to the Ye replacement component calculating unit 132.

  The Ye replacement component calculation unit 132 calculates a Ye replacement signal W corresponding to a component (Ye replacement component) that can replace red component light and green component light with yellow component light.

Here, the red component light and the green component light can be replaced by yellow component light having the same amount of light as the red component light and the green component light. Therefore, the red input signal R _in and the green input signal G _in can be replaced by the Ye replacement signal W having the same signal strength as the red input signal R _in and the green input signal G _in .

Therefore, the Ye replacement component calculation unit 132 calculates the Ye replacement signal W according to the following (Equation 1) based on the red input signal R _in and the green input signal G _in .

[Equation 1]
W = min (R _in , G _in ) (Expression 1)
Note that min (R _in , G _in ) is an input signal having a low signal strength among the red input signal R _in and the green input signal G _in .

The Ye replacement component calculation unit 132 inputs the red input signal R _in , the green input signal G _in, and the Ye replacement signal W to the Ye component adjustment unit 134.

The parameter specifying unit 133 calculates the saturation and luminance of the video reproduced by the red input signal R _in , the green input signal G _in and the blue input signal B _in . Here, as a method for calculating the saturation of the video, the parameter specifying unit 133 may calculate an average value of the saturation of pixels constituting the entire image (frame), and among the pixels constituting the image (frame). The average value of the saturation of pixels having a specific hue may be calculated. Similarly, as a method for calculating the luminance of the video, the parameter specifying unit 133 may calculate the average value of the luminance of the pixels constituting the entire image (frame), and specify among the pixels constituting the image (frame). The average value of the luminance of the pixels having the hue of may be calculated.

Subsequently, the parameter specifying unit 133 specifies parameters (luminance parameter β ₁ , color reproduction parameter α, luminance parameter β ₂ ) with reference to FIG. 4A to FIG. 4C, and specifies the specified parameters. Input to the Ye component adjustment unit 134.

Specifically, as shown in FIG. 4A, the color reproduction parameter α is constant until the saturation of the video (for example, yellow (Ye) hue) reaches Th ₁ . Meanwhile, the color reproduction parameter alpha, the saturation of the image exceeds Th _1, are determined so as to increase with increasing saturation of the image. That is, when the distance between the saturation of the image and the white point is a certain distance or more, the color reproduction parameter α is determined so that the amount of yellow component light increases as the saturation of the image increases away from the white point. .

As shown in FIG. 4B, the luminance parameter β ₁ is decreased as the saturation of the image increases until the saturation of the image (for example, the hue of blue (B)) reaches Th _2. It is stipulated in. On the other hand, the luminance parameter β ₁ is constant when the saturation of the video exceeds Th ₂ . That is, the luminance parameter β ₁ is determined so that the amount of yellow component light decreases as the image saturation increases from the white point within a certain distance between the image saturation and the white point. .

As shown in FIG. 4 (c), the luminance parameter beta ₂ is increased to the luminance of the image becomes Th _3, the luminance of the image is defined so as to decrease after exceeding the Th _3. That is, the luminance parameter β ₂ is determined so that the amount of yellow component light decreases with the peak when the luminance of the video is Th ₃ . As a result, “black floating” when the luminance of the video is low and “whiteout” when the luminance of the video is high are suppressed.

Here, although not particularly shown in FIGS. 4A to 4C, the color reproduction parameter α, the luminance parameter β ₁ and the luminance parameter β ₂ are red (R), green (G), blue ( It may be determined for each hue corresponding to B) and yellow (Ye). Further, the color reproduction parameter α, the luminance parameter β ₁ and the luminance parameter β ₂ may be different values for each hue.

The Ye component adjustment unit 134 specifies the amount of superposition of yellow component light. Specifically, the Ye component adjustment unit 134 controls the amount of yellow component light superimposed based on at least one parameter of the color reproduction parameter α, the luminance parameter β ₁ and the luminance parameter β ₂ and the Ye replacement signal W. The adjustment signal Ye ′ is calculated.

In the first embodiment, the Ye component adjustment unit 134 uses the color reproduction parameter α and the luminance parameter β ₁ in calculating the yellow adjustment signal Ye ′. Specifically, the Ye component adjustment unit 134 calculates the yellow adjustment signal Ye ′ based on (Equation 2) below.

[Equation 2]
Ye ′ = W × (α + β ₁ ) (Formula 4)
The mode control unit 135 controls a luminance priority mode that prioritizes video luminance and a color balance priority mode that prioritizes video color balance. Note that the mode switching may be performed by the user or may be performed depending on the type of the video input signal. For example, in the PC application, the luminance priority mode is applied. On the other hand, for home theater use, the color balance priority mode is applied.

  Specifically, the mode control unit 135 does not reduce at least the light amounts of the non-adjacent color component light and the adjacent color component light when the saturation of the video is lower than a predetermined saturation in the luminance priority mode. Note that the mode control unit 135 may increase the light amounts of the non-adjacent color component light and the adjacent color component light even when the saturation of the video is lower than the predetermined saturation.

Here, the mode control unit 135 does not correct the red input signal R _in , the green input signal G _in , the blue input signal B _in and the yellow adjustment signal Ye ′, and outputs the red output signal R _out and the green output signal G. These signals are output to each liquid crystal panel 30 as _out , blue output signal B _out and yellow output signal Ye _out .

  In the luminance priority mode, the mode control unit 135 performs at least one of a light amount correction process for non-adjacent color component light and a light amount correction process for adjacent color component light when the saturation of the image is higher than a predetermined saturation. Is performed based on the amount of superimposition of the fourth color component light.

Here, the mode control unit 135, based on the yellow adjustment signal Ye ', performs the correction process of the blue input signal B _in. Alternatively, the mode control unit 135 performs a correction process for the red input signal R _in or the green input signal G _in based on the yellow adjustment signal Ye ′. The mode control unit 135 outputs the corrected signal to the liquid crystal panel 30 as the red output signal R _out , the green output signal G _out and the blue output signal B _out for the signal subjected to the correction process. The mode control unit 135 outputs the yellow adjustment signal Ye ′ as the yellow output signal Ye _out to the liquid crystal panel 30Ye.

  In the color balance priority mode, the mode control unit 135 selects at least one of the light amount correction processing for the non-adjacent color component light and the light amount correction processing for the adjacent color component light based on the superimposed amount of the fourth color component light. Process.

Here, the mode control unit 135, based on the yellow adjustment signal Ye ', performs the correction process of the blue input signal B _in. Alternatively, the mode control unit 135 performs a correction process for the red input signal R _in or the green input signal G _in based on the yellow adjustment signal Ye ′. The mode control unit 135 outputs the corrected signal to the liquid crystal panel 30 as the red output signal R _out , the green output signal G _out and the blue output signal B _out for the signal subjected to the correction process. The mode control unit 135 outputs the yellow adjustment signal Ye ′ as the yellow output signal Ye _out to the liquid crystal panel 30Ye.

(Correction process)
Hereinafter, the correction processing according to the first embodiment will be described with reference to the drawings. 5 to 10 are diagrams for describing correction processing according to the first embodiment.

  Here, four correction processes are illustrated as the correction processes. The first correction process is a process applied in the case where the white balance is optimized in the maximum case, and the yellow component light is replaced by the red component light and the green component light having a relationship of R: G of 1: 1. It is. The second correction process is a case where white balance is optimized in the maximum case, and yellow component light is replaced by red component light and green component light having a relationship of R: G of 1: X (> 1). The process to be applied.

  The third correction process is a process applied when the white balance is optimized in the minimum case, and the yellow component light is replaced by the red component light and the green component light having a relationship of R: G of 1: 1. It is. The fourth correction process is a case where white balance is optimized in the minimum case, and yellow component light is replaced by red component light and green component light having a relationship of R: G 1: X (> 1). The process to be applied.

  In the following, the superposition amount of yellow component light is indexed in the range of “0” to “1”. That is, the superposition amount “0” indicates that the superposition amount of yellow component light is minimum. The superposition amount “1” indicates that the superposition amount of yellow component light is the maximum. Similarly, the correction amounts of red component light, green component light, and blue component light are also indexed.

(First correction process)
In the first correction process, the mode control unit 135 performs the correction process for the blue input signal B _in using the lookup table shown in FIG. As shown in FIG. 5, the mode control unit 135 reduces the amount of blue component light as the amount of yellow component light superimposed decreases.

  Specifically, when the amount of yellow component light superimposed is the maximum (ie, “1”), the white balance is optimized, and thus the amount of decrease in blue component light is “0”. On the other hand, the amount of decrease in blue component light increases as the amount of superposition of yellow component light decreases.

For example, when the superposition amount of the yellow component light is “0.4”, the mode control unit 135 multiplies the blue input signal B _in by “1−0.12” to thereby obtain the blue input signal B _in. Correct.

(Second correction process)
In the second correction process, in the yellow component light, the ratio of the green component light is higher than the ratio of the red component light. Therefore, the green component light is reduced more than the red component light as the amount of yellow component light superimposed is reduced. Based on this, two correction processes can be considered as the second correction process.

First, the second correction process (1) will be described. In the second correction process (1), the mode control unit 135 performs the correction process of the blue input signal B _{in and} the correction process of the green input signal G _in using the lookup table shown in FIG. As shown in FIG. 6, the mode control unit 135 reduces the amount of blue component light as the amount of yellow component light superimposed decreases. Further, the mode control unit 135 increases the amount of green component light as the amount of yellow component light superimposed decreases.

  Specifically, when the amount of yellow component light superimposed is maximum (that is, “1”), the white balance is optimized, so the amount of blue component light decrease is “0”, and the green component light is green. The increase amount of the component light is also “0”. On the other hand, as the amount of yellow component light superimposed decreases, the amount of decrease in blue component light increases and the amount of increase in green component light also increases.

For example, when the superposition amount of the yellow component light is “0.4”, the mode control unit 135 multiplies the blue input signal B _in by “1−0.12” to thereby obtain the blue input signal B _in. Correct. Further, the mode control unit 135 corrects the green input signal G _in by multiplying the green input signal G _in by “1 + 0.06”.

  In the second correction process (1), the amount of green component light increases as the blue component light decreases. Therefore, the difference between the luminance value of the output signal and the luminance value of the input signal can be reduced. That is, the luminance change can be reduced.

Second, the second correction process (2) will be described. In the second correction process (2), the mode control unit 135 performs a correction process for the blue input signal B _{in and} a correction process for the red input signal R _in using the lookup table shown in FIG. As shown in FIG. 7, the mode control unit 135 reduces the amount of blue component light as the amount of superposition of yellow component light decreases. Further, the mode control unit 135 reduces the amount of red component light as the amount of superposition of yellow component light decreases.

  Specifically, when the amount of yellow component light superimposed is maximum (that is, “1”), the white balance is optimized, and thus the amount of decrease in blue component light is “0”. The decrease amount of the component light is also “0”. On the other hand, as the amount of yellow component light superimposed decreases, the amount of decrease in blue component light increases and the amount of decrease in red component light also increases.

For example, when the superposition amount of the yellow component light is “0.4”, the mode control unit 135 multiplies the blue input signal B _in by “1−0.12” to thereby obtain the blue input signal B _in. Correct. Further, the mode control unit 135 corrects the red input signal R _in by multiplying the red input signal R _in by “1−0.06”.

(Third correction process)
In the third correction process, the mode control unit 135 performs a correction process for the blue input signal B _in using the lookup table shown in FIG. As shown in FIG. 8, the mode control unit 135 increases the amount of blue component light as the amount of yellow component light superimposed increases.

  Specifically, when the amount of yellow component light superimposed is minimum (that is, “0”), the white balance is optimized, and thus the amount of increase in blue component light is “0”. On the other hand, the increase amount of blue component light increases with the increase of the superposition amount of yellow component light.

For example, when the superposition amount of the yellow component light is “0.4”, the mode control unit 135 corrects the blue input signal B _in by multiplying the blue input signal B _in by “1 + 0.08”. To do.

(Fourth correction process)
In the fourth correction process, in the yellow component light, the ratio of the green component light is higher than the ratio of the red component light. Therefore, as the amount of yellow component light superimposed increases, the green component light increases more than the red component light. Based on this, two correction processes can be considered as the fourth correction process.

First, the fourth correction process (1) will be described. In the fourth correction process (1), the mode control unit 135 performs a correction process for the blue input signal B _{in and} a correction process for the green input signal G _in using the lookup table shown in FIG. As shown in FIG. 9, the mode control unit 135 increases the amount of blue component light as the amount of yellow component light superimposed increases. Further, the mode control unit 135 decreases the amount of green component light as the amount of yellow component light superimposed increases.

  Specifically, when the amount of yellow component light superimposed is minimum (that is, “0”), the white balance is optimized, so the increase amount of blue component light is “0” and green The decrease amount of the component light is also “0”. On the other hand, as the amount of yellow component light superimposed increases, the amount of increase in blue component light increases and the amount of decrease in green component light also increases.

For example, when the superposition amount of the yellow component light is “0.4”, the mode control unit 135 corrects the blue input signal B _in by multiplying the blue input signal B _in by “1 + 0.08”. To do. In addition, the mode control unit 135, by multiplying the "1-0.04" in the green input signal _{G in,} to correct the green input signal _{G in.}

  In the fourth correction process (1), the amount of green component light decreases as the amount of blue component light increases. Therefore, the difference between the luminance value of the output signal and the luminance value of the input signal can be reduced. That is, the luminance change can be reduced.

Secondly, the fourth correction process (2) will be described. In the fourth correction process (2), the mode control unit 135 performs the correction process of the blue input signal B _{in and} the correction process of the red input signal R _in using the lookup table shown in FIG. As shown in FIG. 10, the mode control unit 135 increases the amount of blue component light as the amount of yellow component light superimposed increases. Further, the mode control unit 135 increases the amount of red component light as the amount of yellow component light superimposed increases.

  Specifically, when the amount of yellow component light superimposed is minimum (that is, “0”), the white balance is optimized, so the increase amount of blue component light is “0”, and red The increase amount of the component light is also “0”. On the other hand, as the amount of superposition of yellow component light increases, the amount of increase in blue component light increases and the amount of increase in red component light also increases.

For example, when the superposition amount of the yellow component light is “0.4”, the mode control unit 135 corrects the blue input signal B _in by multiplying the blue input signal B _in by “1 + 0.08”. To do. The mode controller 135 corrects the red input signal R _in by multiplying the red input signal R _in by “1 + 0.04”.

  In the fourth correction process (2), the amount of red component light increases as the amount of blue component light increases. Therefore, it is possible to maintain an optimal white point while improving the luminance.

(Function and effect)
In the first embodiment, since the control unit 130 controls the luminance priority mode and the color balance priority mode, even when the fourth color component light is used, an optimal white is used when the color balance should be maintained. Balance can be maintained.

  Specifically, the mode control unit 135 does not reduce at least the light amounts of the red component light, the green component light, and the blue component light when the saturation of the video is lower than the predetermined saturation in the luminance priority mode. Therefore, in the luminance priority mode, the maximum luminance can be compensated for the low saturation video.

  In the luminance priority mode, the mode control unit 135 performs a light amount correction process for red component light, green component light, or blue component light based on the superimposed amount of yellow component light when the saturation of the image is higher than a predetermined saturation. I do. That is, in the luminance priority mode, it is possible to suppress a decrease in color balance for a high saturation video. In particular, it is possible to reduce a sense of incongruity associated with a shift of a color with high saturation that is visually noticeable by humans.

  In the color balance priority mode, the mode control unit 135 performs light amount correction processing of red component light, green component light, or blue component light based on the superposition amount of yellow component light. That is, in the color balance priority mode, it is possible to suppress a decrease in color balance even for a low-saturation image. Therefore, an optimal white point can be maintained in the color balance priority mode.

[Second Embodiment]
The second embodiment will be described below with reference to the drawings. In the following, differences between the first embodiment and the second embodiment will be mainly described.

Specifically, in the first embodiment, light amount correction processing of red component light, green component light, and blue component light is performed by correction processing of the red input signal R _in , the green input signal G _in, and the blue input signal B _in. .

  On the other hand, in the second embodiment, the light amount correction processing of the red component light, the green component light, and the blue component light is performed before the modulation of each color component light. That is, before each color component light reaches the liquid crystal panel 30, the light amount correction processing of the red component light, the green component light, and the blue component light is performed.

(Outline of projection display device)
Hereinafter, an outline of the projection display apparatus according to the second embodiment will be described with reference to the drawings. FIG. 11 is a diagram showing an outline of a projection display apparatus 100 according to the second embodiment. In FIG. 11, the same reference numerals are given to the same components as those in FIG.

  As shown in FIG. 11, the projection display apparatus 100 includes an auxiliary light source 120 in addition to the configuration shown in FIG. Further, the projection display apparatus 100 includes a mirror 22 a and a mirror 25 a instead of the mirror 22 and the mirror 25.

  The auxiliary light source 120 includes an auxiliary light source 120R, an auxiliary light source 120G, and an auxiliary light source 120B. The auxiliary light source 120R is a solid light source (for example, LED or LD) that emits red component light. The auxiliary light source 120G is a solid light source (for example, LED or LD) that emits green component light. The auxiliary light source 120B is a solid light source (for example, LED or LD) that emits blue component light.

  The mirror 22a is a polarizing mirror that reflects one polarized light and transmits another polarized light. Specifically, the mirror 22a reflects the red component light (one polarized light) emitted from the light source 10, and transmits the red component light (the other polarized light) emitted from the auxiliary light source 120R. It should be noted that the red component light emitted from the auxiliary light source 120R has a different polarization from the red component light emitted from the light source 10.

  The mirror 25a is a polarizing mirror that reflects one polarized light and transmits the other polarized light. Specifically, the mirror 25a reflects the blue component light (one polarized light) emitted from the light source 10, and transmits the blue component light (the other polarized light) emitted from the auxiliary light source 120B. It should be noted that the blue component light emitted from the auxiliary light source 120B has a different polarization from the blue component light emitted from the light source 10.

(Function of projection display device)
Hereinafter, functions of the projection display apparatus according to the second embodiment will be described with reference to the drawings. FIG. 12 is a block diagram illustrating functions of the projection display apparatus 100 (control unit 130) according to the second embodiment. In FIG. 12, the same components as those in FIG.

  As illustrated in FIG. 12, the control unit 130 includes a mode control unit 135 a instead of the mode control unit 135.

  The mode control unit 135a has substantially the same function as the mode control unit 135, and controls the luminance priority mode and the color balance priority mode.

  Specifically, the mode control unit 135a does not decrease the light amounts of at least the non-adjacent color component light and the adjacent color component light when the saturation of the video is lower than the predetermined saturation in the luminance priority mode. However, the mode control unit 135a may increase the light amounts of the non-adjacent color component light and the adjacent color component light even when the saturation of the video is lower than the predetermined saturation.

  In the luminance priority mode, the mode control unit 135a performs at least one of light amount correction processing for non-adjacent color component light and light amount correction processing for adjacent color component light when the saturation of the image is higher than a predetermined saturation. Is performed based on the amount of superimposition of the fourth color component light.

  Here, the mode control unit 135a corrects the light emission amount of the auxiliary light source 120B based on the yellow adjustment signal Ye '. Alternatively, the mode control unit 135a performs a process for correcting the light emission amount of the auxiliary light source 120R or the auxiliary light source 120G based on the yellow adjustment signal Ye '.

  In the color balance priority mode, the mode control unit 135a performs at least one of the light amount correction processing of the non-adjacent color component light and the light amount correction processing of the adjacent color component light based on the amount of superimposition of the fourth color component light. Process.

  Here, the mode control unit 135a corrects the light emission amount of the auxiliary light source 120B based on the yellow adjustment signal Ye '. Alternatively, the mode control unit 135a performs a process for correcting the light emission amount of the auxiliary light source 120R or the auxiliary light source 120G based on the yellow adjustment signal Ye '.

(Correction process)
Hereinafter, correction processing according to the second embodiment will be described with reference to the drawings. 13 to 18 are diagrams for describing correction processing according to the second embodiment.

  Here, as in the first embodiment, four correction processes are exemplified as the correction process. The first correction process is a process applied in the case where the white balance is optimized in the maximum case, and the yellow component light is replaced by the red component light and the green component light having a relationship of R: G of 1: 1. It is. The second correction process is a case where white balance is optimized in the maximum case, and yellow component light is replaced by red component light and green component light having a relationship of R: G of 1: X (> 1). The process to be applied.

  The third correction process is a process applied when the white balance is optimized in the minimum case, and the yellow component light is replaced by the red component light and the green component light having a relationship of R: G of 1: 1. It is. The fourth correction process is a case where white balance is optimized in the minimum case, and yellow component light is replaced by red component light and green component light having a relationship of R: G 1: X (> 1). The process to be applied.

  In the following, the superposition amount of yellow component light is indexed in the range of “0” to “1”. That is, the superposition amount “0” indicates that the superposition amount of yellow component light is minimum. The superposition amount “1” indicates that the superposition amount of yellow component light is the maximum.

(First correction process)
In the first correction process, the mode control unit 135a performs a process of correcting the light emission amount of the auxiliary light source 120B using the lookup table shown in FIG. As shown in FIG. 13, the mode control unit 135a decreases the amount of blue component light as the amount of superposition of yellow component light decreases.

  Specifically, when the amount of yellow component light superimposed is the maximum (ie, “1”), the white balance is optimized, and thus the amount of decrease in blue component light is “0”. That is, the light emission amount of the auxiliary light source 120B is “P”. On the other hand, the amount of decrease in blue component light increases as the amount of superposition of yellow component light decreases. That is, the amount of light emitted from the auxiliary light source 120B decreases as the amount of superposition of yellow component light decreases.

  For example, when the amount of yellow component light superimposed is “0.4”, the mode control unit 135a emits light from the auxiliary light source 120B so as to reduce the amount of blue component light corresponding to “0.12”. Decrease the amount. That is, the mode control unit 135a controls the light emission amount of the auxiliary light source 120B to “P−α3”.

  It should be noted that the auxiliary light source 120G and the auxiliary light source 120R are not necessary in the first correction process. The projection display apparatus 100 may not include the auxiliary light source 120G and the auxiliary light source 120R.

(Second correction process)
In the second correction process, in the yellow component light, the ratio of the green component light is higher than the ratio of the red component light. Therefore, the green component light is reduced more than the red component light as the amount of yellow component light superimposed is reduced. Based on this, two correction processes can be considered as the second correction process.

  First, the second correction process (1) will be described. In the second correction process (1), the mode control unit 135a performs a process of correcting the light emission amounts of the auxiliary light source 120B and the auxiliary light source 120G using the lookup table shown in FIG. As shown in FIG. 14, the mode control unit 135a decreases the amount of blue component light as the amount of superposition of yellow component light decreases. Further, the mode control unit 135a increases the amount of green component light as the amount of yellow component light superimposed decreases.

  Specifically, when the amount of yellow component light superimposed is maximum (that is, “1”), the white balance is optimized, so the amount of blue component light decrease is “0”, and the green component light is green. The increase amount of the component light is also “0”. That is, the light emission amount of the auxiliary light source 120B is “P”, and the light emission amount of the auxiliary light source 120G is “Q”. On the other hand, as the amount of yellow component light superimposed decreases, the amount of decrease in blue component light increases and the amount of increase in green component light also increases. That is, as the amount of yellow component light superimposed decreases, the amount of light emitted from the auxiliary light source 120B decreases and the amount of light emitted from the auxiliary light source 120G increases.

  For example, when the amount of yellow component light superimposed is “0.4”, the mode control unit 135a emits light from the auxiliary light source 120B so as to reduce the amount of blue component light corresponding to “0.12”. Decrease the amount. That is, the mode control unit 135a controls the light emission amount of the auxiliary light source 120B to “P−α3”. Further, the mode control unit 135a increases the light emission amount of the auxiliary light source 120G so as to increase the light amount of the green component light corresponding to “0.06”. That is, the mode control unit 135a controls the light emission amount of the auxiliary light source 120G to “Q + β3”.

  In the second correction process (1), the amount of green component light increases as the amount of blue component light decreases. Therefore, the difference between the luminance value of the output signal and the luminance value of the input signal can be reduced. That is, the luminance change can be reduced.

  It should be noted that the auxiliary light source 120R is not necessary in the second correction process (1). The projection display apparatus 100 may not have the auxiliary light source 120R.

  Second, the second correction process (2) will be described. In the second correction process (2), the mode control unit 135a performs a process of correcting the light emission amounts of the auxiliary light source 120B and the auxiliary light source 120R using the lookup table shown in FIG. As shown in FIG. 15, the mode control unit 135a reduces the amount of blue component light as the amount of superposition of yellow component light decreases. In addition, the mode control unit 135a reduces the amount of red component light as the amount of superposition of yellow component light decreases.

  Specifically, when the amount of yellow component light superimposed is maximum (that is, “1”), the white balance is optimized, and thus the amount of decrease in blue component light is “0”. The decrease amount of the component light is also “0”. That is, the light emission amount of the auxiliary light source 120B is “P”, and the light emission amount of the auxiliary light source 120R is “R”. On the other hand, as the amount of yellow component light superimposed decreases, the amount of decrease in blue component light increases and the amount of decrease in red component light also increases. That is, as the amount of yellow component light superimposed decreases, the amount of light emitted from the auxiliary light source 120B decreases and the amount of light emitted from the auxiliary light source 120R decreases.

  For example, the mode control unit 135a sets “0.12” when the yellow component light overlap amount is “0.4” when the yellow component light overlap amount is “0.4”. The amount of light emitted from the auxiliary light source 120B is reduced so as to reduce the amount of the corresponding blue component light. That is, the mode control unit 135a controls the light emission amount of the auxiliary light source 120B to “P−α3”. Further, the mode control unit 135a reduces the light emission amount of the auxiliary light source 120R so as to reduce the light amount of the red component light corresponding to “0.06”. That is, the mode control unit 135a controls the light emission amount of the auxiliary light source 120R to “R−γ3”.

  It should be noted that the auxiliary light source 120G is not necessary in the second correction process (2). The projection display apparatus 100 may not have the auxiliary light source 120G.

(Third correction process)
In the third correction process, the mode control unit 135a performs a process of correcting the light emission amount of the auxiliary light source 120B using the lookup table shown in FIG. As shown in FIG. 16, the mode control unit 135a increases the amount of blue component light as the amount of yellow component light superimposed increases.

  Specifically, when the amount of yellow component light superimposed is minimum (that is, “0”), the white balance is optimized, and thus the amount of increase in blue component light is “0”. That is, the light emission amount of the auxiliary light source 120B is “P”. On the other hand, the increase amount of blue component light increases with the increase of the superposition amount of yellow component light. That is, the amount of light emitted from the auxiliary light source 120B increases as the amount of yellow component light superimposed increases.

  For example, when the amount of yellow component light superimposed is “0.4”, the mode control unit 135a emits light from the auxiliary light source 120B so as to increase the amount of blue component light corresponding to “0.08”. Decrease the amount. That is, the mode control unit 135a controls the light emission amount of the auxiliary light source 120B to “P + α2”.

  It should be noted that the auxiliary light source 120G and the auxiliary light source 120R are not necessary in the third correction process. The projection display apparatus 100 may not include the auxiliary light source 120G and the auxiliary light source 120R.

(Fourth correction process)
In the fourth correction process, in the yellow component light, the ratio of the green component light is higher than the ratio of the red component light. Therefore, as the amount of yellow component light superimposed increases, the green component light increases more than the red component light. Based on this, two correction processes can be considered as the second correction process.

  First, the fourth correction process (1) will be described. In the fourth correction process (1), the mode control unit 135a performs a process of correcting the light emission amounts of the auxiliary light source 120B and the auxiliary light source 120G using the lookup table shown in FIG. As shown in FIG. 17, the mode control unit 135a increases the amount of blue component light as the amount of yellow component light superimposed increases. Further, the mode control unit 135a decreases the amount of green component light as the amount of yellow component light superimposed increases.

  Specifically, when the amount of yellow component light superimposed is minimum (that is, “0”), the white balance is optimized, so the increase amount of blue component light is “0” and green The decrease amount of the component light is also “0”. That is, the light emission amount of the auxiliary light source 120B is “P”, and the light emission amount of the auxiliary light source 120G is “Q”. On the other hand, as the amount of yellow component light superimposed increases, the amount of increase in blue component light increases and the amount of decrease in green component light also increases. That is, as the amount of yellow component light superimposed increases, the amount of light emitted from the auxiliary light source 120B increases and the amount of light emitted from the auxiliary light source 120G decreases.

  For example, when the amount of yellow component light superimposed is “0.4”, the mode control unit 135a emits light from the auxiliary light source 120B so as to increase the amount of blue component light corresponding to “0.08”. Increase the amount. That is, the mode control unit 135a controls the light emission amount of the auxiliary light source 120B to “P + α2”. In addition, the mode control unit 135a reduces the light emission amount of the auxiliary light source 120G so as to reduce the light amount of the green component light corresponding to “0.04”. That is, the mode control unit 135a controls the light emission amount of the auxiliary light source 120G to “Q−β2”.

  In the fourth correction process (1), the amount of green component light decreases as the amount of blue component light increases. Therefore, the difference between the luminance value of the output signal and the luminance value of the input signal can be reduced. That is, the luminance change can be reduced.

  It should be noted that the auxiliary light source 120R is not necessary in the fourth correction process (1). The projection display apparatus 100 may not have the auxiliary light source 120R.

  Secondly, the fourth correction process (2) will be described. In the fourth correction process (2), the mode control unit 135a performs a process of correcting the light emission amounts of the auxiliary light source 120B and the auxiliary light source 120R using the lookup table shown in FIG. As shown in FIG. 18, the mode control unit 135a increases the amount of blue component light as the amount of yellow component light superimposed increases. Further, the mode control unit 135a increases the amount of red component light as the amount of yellow component light superimposed increases.

  Specifically, when the amount of yellow component light superimposed is minimum (that is, “0”), the white balance is optimized, so the increase amount of blue component light is “0”, and red The increase amount of the component light is also “0”. That is, the light emission amount of the auxiliary light source 120B is “P”, and the light emission amount of the auxiliary light source 120R is “R”. On the other hand, as the amount of superposition of yellow component light increases, the amount of increase in blue component light increases and the amount of increase in red component light also increases. That is, as the amount of yellow component light superimposed decreases, the amount of light emitted from the auxiliary light source 120B increases and the amount of light emitted from the auxiliary light source 120R increases.

  For example, the mode control unit 135a sets “0.08” when the superposition amount of yellow component light is “0.4” and when the superposition amount of yellow component light is “0.4”. The light emission amount of the auxiliary light source 120B is increased so as to increase the amount of the corresponding blue component light. That is, the mode control unit 135a controls the light emission amount of the auxiliary light source 120B to “P + α2”. Further, the mode control unit 135a increases the light emission amount of the auxiliary light source 120R so as to increase the light amount of the red component light corresponding to “0.04”. That is, the mode control unit 135a controls the light emission amount of the auxiliary light source 120R to “R + γ2”.

  In the fourth correction process (2), the amount of red component light increases as the amount of blue component light increases. Therefore, it is possible to maintain an optimal white point while improving the luminance.

  It should be noted that the auxiliary light source 120G is not necessary in the fourth correction process (2). The projection display apparatus 100 may not have the auxiliary light source 120G.

(Function and effect)
In the second embodiment, the same effect as in the first embodiment can be obtained by controlling the light emission amount of the auxiliary light source 120.

[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, the first embodiment and the second embodiment may be combined. Specifically, correction by signal control and correction by auxiliary light source control may be combined.

  In the above-described embodiment, only the lookup tables illustrated in FIGS. 5 to 10 and FIGS. 13 to 18 are illustrated. Instead of the look-up table, a curve or a calculation formula that defines correction amounts of red component light, green component light, and blue component light may be used based on the superimposed amount of the fourth color component light.

  In the embodiment described above, the amount of superimposition of the fourth color component light is calculated based on the Ye replacement component that substitutes for the red component light and the green component light, but the embodiment is not limited to this. The amount of superimposition of the fourth color component light may be a default value determined for each mode.

  In the embodiment described above, the shift of the white point accompanying the change in the amount of superimposition of the fourth color component light is compensated mainly by the increase or decrease of the light amount of the blue component light. However, the embodiment is not limited to this. The shift of the white point accompanying the change in the amount of superimposition of the fourth color component light may be compensated mainly by an increase or decrease in the light amounts of the red component light and the green component light.

  In the second embodiment, the light emission amount of the auxiliary light source 120 is controlled in order to correct the light amounts of the red component light, the green component light, and the blue component light, but the embodiment is not limited to this. The correction of the light amounts of the red component light, the green component light, and the blue component light may be performed by controlling a diaphragm unit provided on the optical path of each color component light. The stop portion is provided on the optical path of each color component light after each color component light is separated.

  In the embodiment described above, the fourth color component light is yellow component light, but the embodiment is not limited to this. The fourth color component light may be cyan component light or magenta component light.

In the embodiment described above, the yellow output signal Ye _out is generated using the color reproduction parameter α and the luminance parameter β ₁ , but the present embodiment is not limited to this. Specifically, the yellow output signal Ye _out may be generated using only the color reproduction parameter α or may be generated using only the luminance parameter β ₁ . The yellow output signal Ye _out may be generated using only the luminance parameter β ₂ . The yellow output signal Ye _out may be generated using the luminance parameter β ₁ and the luminance parameter β ₂ . The yellow output signal Ye _out may be generated by appropriately combining the color reproduction parameter α, the luminance parameter β ₁ and the luminance parameter β ₂ .

  In the embodiment described above, the superposition amount of the yellow component light is controlled by the modulation amount of the liquid crystal panel 30Ye, but is not limited to this. Specifically, the amount of yellow component light superimposed may be controlled by an iris mechanism provided on the optical path of yellow component light.

  In the above-described embodiment, the liquid crystal panel is taken as an example of the light modulation element, but the present invention is not limited to this. Specifically, the light modulation element may be LCOS (Liquid Crystal on Silicon), DMD (Digital Micromirror Device), or the like.

1 is a diagram showing an outline of a projection display apparatus 100 according to a first embodiment. It is a figure which shows the chromaticity degree which concerns on 1st Embodiment. It is a block diagram which shows the structure of the control part 130 which concerns on 1st Embodiment. FIG. 6 is a diagram showing a color reproduction parameter α, a luminance parameter β ₁ and a luminance parameter β _{2 according} to the first embodiment. It is a figure explaining the correction process which concerns on 1st Embodiment. It is a figure explaining the correction process which concerns on 1st Embodiment. It is a figure explaining the correction process which concerns on 1st Embodiment. It is a figure explaining the correction process which concerns on 1st Embodiment. It is a figure explaining the correction process which concerns on 1st Embodiment. It is a figure explaining the correction process which concerns on 1st Embodiment. It is a figure which shows the outline of the projection type video display apparatus 100 concerning 2nd Embodiment. It is a block diagram which shows the structure of the control part 130 which concerns on 2nd Embodiment. It is a figure explaining the correction process which concerns on 2nd Embodiment. It is a figure explaining the correction process which concerns on 2nd Embodiment. It is a figure explaining the correction process which concerns on 2nd Embodiment. It is a figure explaining the correction process which concerns on 2nd Embodiment. It is a figure explaining the correction process which concerns on 2nd Embodiment. It is a figure explaining the correction process which concerns on 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Light source, 21-25 ... Mirror, 30 ... Liquid crystal panel, 31-32 ... Polarizing plate, 50 ... Phase difference plate, 60 ... Dichroic cube, 100 ... Projection Type image display device, 110 ... projection lens, 120 ... auxiliary light source, 130 ... control unit, 131 ... input signal receiving unit, 132 ... Ye substitution component calculation unit, 133 ... parameter Specific unit, 134... Ye component adjustment unit, 135... Mode control unit

Claims (8)

A red modulation element that modulates red component light according to a red input signal, a green modulation element that modulates green component light according to a green input signal, and a blue modulation element that modulates blue component light according to a blue input signal A projection-type image display device that superimposes a fourth color component light on any of the red component light, the green component light, and the blue component light,
A control unit that controls a luminance priority mode that prioritizes video brightness and a color balance priority mode that prioritizes color balance of the video ,
In the luminance priority mode, the control unit is configured to output non-adjacent color component light when the saturation of the image calculated based on the red input signal, the green input signal, and the blue input signal is lower than a predetermined saturation. And when the saturation of the video is higher than the predetermined saturation without reducing at least the light amount of the adjacent color component light, the light amount correction processing of the non-adjacent color component light and the light amount correction processing of the adjacent color component light. And performing at least one of the processes based on the amount of superimposition of the fourth color component light,
The non-adjacent color component light is color component light having a hue that is not adjacent to the hue of the fourth color component light among the red component light, the green component light, and the blue component light.
Projection said adjacent color component light, the red component light, among the green component light and the blue component light, characterized by color component light der Rukoto having hues adjacent to the hue of the fourth color component light Type image display device. In the color balance priority mode, the control unit is further based on the saturation of the image calculated based on the red input signal, the green input signal, and the blue input signal and the amount of superimposition of the fourth color component light. Then, at least one of the light amount correction processing of the non-adjacent color component light and the light amount correction processing of the adjacent color component light is performed,
The non-adjacent color component light is color component light having a hue that is not adjacent to the hue of the fourth color component light among the red component light, the green component light, and the blue component light.
The adjacent color component light is color component light having a hue adjacent to a hue of the fourth color component light among the red component light, the green component light, and the blue component light. 2. A projection display apparatus according to 1. The control unit corrects a light amount of the non-adjacent color component light by correcting a non-adjacent color signal corresponding to the non-adjacent color component light among the red input signal, the green input signal, and the blue input signal. The projection display apparatus according to claim 2 , further comprising a signal correction unit that performs processing. The controller performs a light amount correction process of the adjacent color component light by correcting an adjacent color signal corresponding to the adjacent color component light among the red input signal, the green input signal, and the blue input signal. The projection display apparatus according to claim 2 , further comprising a signal correction unit. The control unit includes a light amount correction unit that performs light amount correction processing of the non-adjacent color component light by correcting the light amount of the non-adjacent color component light before the modulation of the non-adjacent color component light. The projection display apparatus according to claim 2 . The control unit includes a light amount correction unit that performs a light amount correction process of the adjacent color component light by correcting the light amount of the adjacent color component light before the modulation of the adjacent color component light. Item 3. A projection display apparatus according to Item 2 . White balance is optimized based on the case where the amount of superimposition of the fourth color component light is maximum, and the light amount correction processing of the non-adjacent color component light reduces the amount of superimposition of the fourth color component light. The projection type image display apparatus according to claim 2 , wherein the projection type image display apparatus is a process of reducing a light amount of the non-adjacent color component light. The white balance is optimized based on the case where the amount of superimposition of the fourth color component light is minimum,
The light intensity correction processing nonadjacent color component light according to claim 2, characterized in that with a decrease in the superposition amount of the fourth color component light is the process of increasing the amount of the non-adjacent color component light Projection image display device.

Images