JP4739035B2 - Projector device - Google Patents

Description

  The present invention relates to a projector device, and more particularly to a projector device having a function of increasing the illuminance of an achromatic region included in a projection image.

  2. Description of the Related Art Projector apparatuses that use an image device to modulate light source light to generate an image and project the image light on a screen or the like using a projection lens have become widespread. As such a projector apparatus, there is known a DLP projector that generates an image by reflecting light with an image device using a DMD (Digital Micromirror Device) element and displays the image by projecting the generated image.

The DLP projector device includes a light source that emits white light and a disk-shaped color wheel that is divided into RGB filters around the rotation axis, and passes the light from the light source through the rotating color wheel before time-divided images. Configured to illuminate the device.
In this case, the DMD element generates an image for each color in synchronization with the rotation of the color wheel, and the image for each color is projected in a time division manner. A user who views the image projected by the DLP projector device recognizes a color image from the image of each color projected in time division.
In addition to the RGB color filters of the color wheel, a DLP projector apparatus is used in which the illuminance of the projected image is improved by adding a W (white) filter that transmits white light.

  Some conventional projector apparatuses have a so-called white boost function for increasing the illuminance of an achromatic region included in an image in order to make the image brighter or improve the contrast. FIG. 5 is a diagram for explaining an example of white boost control that enhances the illuminance of the achromatic region included in the image.

  For example, as shown in FIG. 5A, it is assumed that image data is composed of a chromatic region composed of pixels indicating colors and brightness and an achromatic region composed of pixels indicating only light and dark. The illuminance distribution of the image data in the image at this time is as shown in FIG. In FIG. 5B, the horizontal axis indicates the position in the image of each part included in the chromatic region and the achromatic region, and the vertical axis indicates the illuminance of the projected image when the image data is projected.

  The illuminance of the projected image in the achromatic region can be increased by the white boost control function of the projector device. Here, when an achromatic image is projected in a time-sharing manner, white light that has passed through the W filter is added to the image light of each pixel that is generated by the light passing through the RGB filter, thereby generating a projected image. Illuminance can be increased.

FIG. 5C is a diagram illustrating an illuminance distribution of a projection image in which the illuminance is increased by white boost control. In this way, when white boost control is performed, the illuminance of the projected image is unchanged in the chromatic region of the image data, whereas in the achromatic region of the image data, the illuminance is increased in the projected image and is projected as a whole. The image is brighter.
Techniques for increasing the illuminance of the achromatic region included in the image are disclosed in, for example, Patent Document 1, Patent Document 2, and Patent Document 3.
JP-A-10-78550 JP 2004-526992 A Japanese Patent Laid-Open No. 11-6969

  When the white boost control function is used to increase the illuminance of the achromatic region included in the image data, the illuminance of the colored region included in the image data does not change as described above, and only the illuminance of the achromatic region is improved. To do. At this time, in the projected image, the chromatic area included in the image data is visually felt as if it is darker than the achromatic area, and the image becomes dull and vivid, resulting in a decrease in color reproducibility. There is.

  On the other hand, if the light transmitted through the W filter is added to the chromatic area for the purpose of improving the illuminance of the chromatic area, the original color is lost and the color becomes dull. There arises a problem of incurring a decrease in.

  The present invention has been made in view of the above circumstances, and in a projector device that enhances the illuminance of the achromatic region by applying white boost control to the image data, the chromatic region included in the image data It is an object of the present invention to provide a projector device that can improve the video quality of a projected image by suppressing the decrease in vividness of the image and increasing the illuminance in an achromatic region.

In order to solve the above problems, a first technical means includes a light source, an image device that modulates light emitted from the light source to generate an image, and a projection optical system that projects an image generated by the image device. In the projector apparatus, the projector apparatus includes an achromatic color area detecting unit that detects an achromatic color area for each frame of image data to be projected, and a bright portion that detects a bright area of a predetermined level or more for each frame of the image data. And an illuminance enhancing means for enhancing the illuminance of the projected image. The illuminance enhancing means is an achromatic area detected by the achromatic color area detecting means and detected by the bright area detecting means. against the bright area, by enhancing the amount of light used for projection imaging, to enhance the intensity of the projected image, the projector apparatus, the average of each frame of the image data to be projected An average luminance level detecting means for detecting a degree level, and a coloring ratio detecting means for detecting a coloring ratio representing the degree of an achromatic region for each frame of image data to be projected. According to the average luminance level detected by the detection means and the color ratio detected by the color ratio detection means, the enhancement amount of the projected image is changed, and the brightness level of the image data to be projected, Holds multiple illuminance control characteristic curve data that defines the relationship with the illuminance obtained in the projected image, selects one of the multiple illuminance control characteristic curve data according to the average luminance level and / or color ratio, and selects the selected illuminance The illuminance enhancement is performed according to the control characteristic curve .

A second technical means is the first technical means, illumination enhancement means, when selecting a plurality of illumination control characteristic curve, as the average luminance level is high, and as the degree of the achromatic region is high, illumination enhancement The illuminance control characteristic curve having a large amount is selected.

A third technical means is colored in the first or second technical means, color ratio detection means, according to the detection result of the achromatic region detecting means, by the ratio of the achromatic color area and a non-achromatic region for each frame It is characterized by detecting the rate.

According to a fourth technical means, in the first or second technical means, the color ratio detecting means assigns a weight to a difference in RGB signal level for each frame, and the weight is increased as the level difference is larger. The coloration rate in the frame is determined by integrating within the frame.

A fifth technical means is the projector according to any one of the first to fourth technical means, wherein the projector device includes a color wheel including three color filters of RGB and a W filter that transmits light source light. The image device generates projection image light by the light transmitted through the color wheel filter, and the illuminance enhancement means enhances the illuminance of the projection image by enhancing the amount of light used by the light source light that has passed through the W filter. It is characterized by.

According to a sixth technical means, in the fifth technical means, the projector device is a DLP projector device including a DMD element as an image device.

  According to the present invention, in the projector device that enhances the illuminance of the achromatic region by applying white boost control to the image data, the reduction of the vividness of the chromatic region included in the image data is suppressed, and By increasing the illuminance in the achromatic region, the video quality of the projected image can be improved.

  FIG. 1 is a block diagram for explaining an embodiment of a projector according to the present invention. The projector includes a light source 1 such as a metal halide lamp that emits white light, a color wheel 2 that transmits light emitted from the light source 1, and an image device 3 that generates an image by modulating light transmitted through the color wheel 2. A projection optical system 4 for enlarging and projecting the image generated by the image device 3 to the outside.

  The color wheel 2 is formed in a disk shape and is configured to be rotatable, and a plurality of filters that transmit light of unique colors are arranged around the rotation axis. Here, it is assumed that the color wheel 2 includes four color (RGBW) filters including three RGB filters that respectively transmit RGB light and a W (white) filter that transmits white light.

  The light emitted from the light source 1 passes through each color RGBW filter of the rotating color wheel 2, and an image to be projected is generated by the image device 3. As the image device 3, the DMD element described above is used, and an image of each color of RGBW is generated in a time division manner. The DMD element generates a color image by light of each color that is time-divided by the reflected light from the macro mirror. The projection optical system 4 is an optical system including a projection lens that projects the image light generated by the image device 3 onto an arbitrary projection surface such as a screen.

The control unit 7 performs processing for controlling the operation of each unit of the entire projector apparatus. The control unit 7 includes a processor that performs calculation, a ROM that stores information such as a program necessary for the calculation, and a RAM that stores temporarily generated information. I have.
The color wheel driving unit 5 includes a motor that rotationally drives the color wheel 2, a control circuit that controls the rotation speed of the color wheel 2, and the like. The image device driving unit 6 drives the image device 3 to generate an image corresponding to the image signal to be displayed. The operations of the color wheel driving unit 5 and the image device driving unit 6 are controlled by the control unit 7.

The video receiver 9 receives image data transmitted from an external device such as a personal computer (PC) or a video playback device.
The signal level detection unit 8 detects an achromatic pixel region and a pixel region brighter than a predetermined level for each frame from the image data received by the video reception unit 9, and further calculates an average for each frame from the image data. The brightness level and the image coloring rate are detected. Each piece of detected information is input to the control unit 7, and white boost control processing is performed by the white boost control circuit 71 included in the control unit 7. A more specific configuration and operation of the signal level detector 8 will be described later.

  The white boost control function in the white boost control circuit 71 is realized by controlling the amount of white light that passes through the W filter of the color wheel 2. In this case, the white boost control performs control to add light passing through the W filter to the projection image light of the achromatic pixel of the video signal. Thereby, the illuminance of the projected image of the achromatic pixel portion to which the white boost control is added can be increased.

  The degree of illuminance enhancement of the projected image can be arbitrarily adjusted by controlling the amount of light that passes through the white (W) filter to each pixel. In this case, in a DLP projector device using a DMD element, the illuminance enhancement amount of the projected image can be controlled by controlling the driving of the micromirror of the DMD element and adjusting the reflected light amount of the light passing through the white filter. . The illuminance enhancing means of the present invention is realized by the control unit 7 including the white boost control circuit 71, the image device driving unit 6, and the color wheel driving unit 5.

FIG. 2 is a block diagram for explaining a configuration example of a signal level detection unit provided in an embodiment of the projector of the present invention.
Image data RGB of the video signal received by the video receiver 9 is input to the RGB-Yuv conversion circuit 81 of the signal level detector 8. The RGB-Yuv conversion circuit 81 converts the input RGB signal into a color space of a Yuv signal (Y: luminance signal, u: difference signal between luminance signal and red component, v: difference signal between luminance signal and blue signal). To do.

  Among the Yuv signals converted by the RGB-Yuv conversion circuit 81, the uv signal is input to the uv level detection circuit 82, and the uv level (that is, the color level of each color of RGB) is detected for each pixel in the frame. The detected uv level is output to the achromatic color detection circuit 86 and the chromatic pixel counting circuit 85. The achromatic color detection circuit 86 detects an achromatic color pixel in the frame based on the uv level for each pixel. Information on the detected achromatic pixel is input to the control unit 7 as an achromatic color detection signal. Further, the achromatic color area detecting means of the present invention is realized by the achromatic color detecting circuit 86.

  When the achromatic color detection circuit 86 determines whether the color is an achromatic color or a non-achromatic color (chromatic color), for example, when the difference between the RGB signal levels of the pixels is at a uniform level within a predetermined threshold (referred to as S1). It can be determined as an achromatic color, and it can be determined as an achromatic color at other times. Since the illuminance enhancement process by the white boost control is performed on the pixel determined to be an achromatic color, the target range of the white boost changes according to the preset threshold (S1). Become.

Among the Yuv signals converted by the RGB-Yuv conversion circuit 81, the Y signal is input to the Y level detection circuit 83 and the Y signal integration circuit 84.
The Y level detection circuit 83 detects the Y signal level for each pixel in the frame and outputs it to the bright part detection circuit 87. The bright part detection circuit 87 detects pixels in the bright part in the frame. At this time, for example, when the Y signal level is higher than a predetermined threshold (referred to as S2), it can be determined that the pixel belongs to the bright portion. The detected bright part information is output to the control unit 7 as a bright part detection signal. Since the illuminance enhancement process by the white boost control is performed on the pixel determined to be a bright part, the white boost target range changes according to the preset threshold value (S2). Become. The white boost control process according to the lightness will be described later. The bright area detection means of the present invention is realized by the bright area detection circuit 87.

  The Y signal integration circuit 84 integrates the Y signal levels of the pixels in the frame and outputs them to the video average level detection circuit 88. The video average level detection circuit 88 detects an average picture level (APL) for each frame in accordance with the output value from the Y signal integration circuit 84. The detected average luminance level information is output as a control signal 1 to the control unit 7. The control signal 1 at this time may be the average luminance level information itself for each detected frame, and the detected average luminance level for each frame is set to a predetermined threshold level (referred to as S3). In comparison, the control signal may indicate whether the frame is a bright frame or a dark frame. Further, a predetermined threshold value (S3) may be provided in multiple stages, and the control signal may indicate which of the plurality of brightness levels the average luminance level for each frame belongs to. The average luminance level detecting means of the present invention is realized by the Y signal integrating circuit 84 and the video average level detecting circuit 88.

  The chromatic pixel counting circuit 85 detects the video chromatic ratio for each frame based on the uv level output from the uv level detection circuit 82. The image coloring ratio is obtained from the ratio of the chromatic color pixels and the number of pixels of the achromatic color pixels in the frame. The determination of the chromatic color pixel and the achromatic color pixel is determined as an achromatic color when the RGB signal level of the pixel is at a uniform level equal to or lower than a predetermined threshold (S1) as described above, and a non-achromatic color otherwise. It can be determined that

  As another method for detecting the image color rate, the color rate in the frame can be obtained based on the RGB level difference. For example, a weight is given to the RGB level difference of each pixel, a weight having a large level difference (that is, a dark color) is increased, and an achromatic color pixel having the same RGB level is decreased. Thus, based on the weighting of the colors in the frame, for example, by setting the weighting in the frame, it is possible to set so that the color ratio in the frame is detected as a parameter.

  The video color ratio information detected by the video color ratio detection circuit 89 is input to the control unit 7 as the control signal 2. The control signal 2 at this time may be the video color rate information itself for each detected frame, and the video color rate for each detected frame is set to a predetermined threshold level (referred to as S4). In comparison, it may be a control signal indicating whether the frame has many chromatic colors or few frames. Further, a predetermined threshold value (S4) may be provided in multiple stages, and a control signal indicating which of the plurality of color ratios the image color ratio for each frame may belong to. The chromaticity ratio detecting means of the present invention is realized by the chromatic pixel counting circuit 85 and the video chromaticity ratio detecting circuit 89.

  The control unit 7 performs white boost control on the video signal based on the achromatic color detection signal, the bright portion detection signal, the control signal 1 and the control signal 2 output from the signal level detection unit 8, and drives the image device. Driving the unit 6 increases the illuminance of the projected image of the achromatic signal.

  FIG. 3 is a diagram illustrating an example of illuminance control characteristics of a projected image by white boost control according to an input video signal. In FIG. 3, the horizontal axis indicates the brightness of the input video signal, and the vertical axis indicates the illuminance of the projection image controlled in accordance with the input video signal level.

In the embodiment according to the present invention, pixels having a video signal level brighter than a predetermined reference level (corresponding to the threshold value S2) based on the achromatic color detection signal and the bright part detection signal output from the signal level detection unit 8 are used. In addition, the illuminance enhancement of the projected image is performed by white boost control on the achromatic color pixel (the pixel determined to be achromatic color based on the detection result of the achromatic color detection circuit 86).
In the white boost control, light that passes through the W filter of the color wheel 2 is added to light that enters the micromirror corresponding to the achromatic color pixel among the micromirrors of the DMD element. As a result, the illuminance of the projected image in the achromatic color pixel is enhanced, thereby making it possible to improve the quality of the projected image by making the screen brighter or improving the contrast.

In the present embodiment, as described above, white boost control is performed on achromatic pixels in a video signal level range brighter than the lightness reference level (S2).
The reason why white boost control is not performed for chromatic pixels is that, as described above, when the illuminance of the chromatic pixels is increased, the color becomes dull, and the saturation and hue of the chromatic area are shifted and projected. This is because the color quality of the image is deteriorated. The reason why white boost control is performed only for achromatic pixels brighter than the lightness reference level (S2) is that when the illuminance is increased for a dark pixel region, the originally dark image region becomes brighter, and the quality of the projected image is improved. This is because it may worsen.

  As a feature of the present embodiment, as shown in FIG. 3, the control signal 1 output from the video average level detection circuit 88 of the signal level detection unit 8, and the control signal 2 output from the video color ratio detection circuit 89 Based on, the illuminance control characteristic of the projected video by the white boost control circuit 71 is switched.

  For example, as shown in FIG. 3, illuminance control characteristic curves (1) to (5) by white boost control are set in advance, and data of the illuminance control characteristic curves are held in, for example, a memory included in the control unit 7. deep. In this example, the illuminance control characteristic curve (1) indicates the relationship between the input video signal level and the projected video illuminance when the white boost control is not performed. The illuminance control characteristic curve (5) shows the relationship between the input video signal level and the projected video illuminance when the white boost control function of the projector apparatus is used to the maximum. The illuminance control characteristic curves (2) to (4) are set stepwise between the illuminance control characteristic curves (1) and (5).

The controller 7 switches the illuminance control characteristic curves (1) to (5) based on the control signal 1 and the control signal 2 output from the signal level detector 8, and performs white boost control.
First, as an example of white boost control based on the average luminance level by the control signal 1, the illuminance control characteristic curve (5) is used in the brightest frame based on the control signal 1 output from the signal level detection unit 2, and is the darkest. The illuminance control characteristic curve (1) is used in the frame. Further, at the intermediate average luminance level, any one of the illuminance control characteristic curves (2) to (4) is used according to the average luminance level. The relationship between the average luminance level and the illuminance control characteristic curve to be used is determined in advance.

  In a frame having a low average luminance level (that is, dark overall), if the white boost is excessively applied, the video quality may be deteriorated. Therefore, an illuminance control characteristic curve having a relatively small illuminance enhancement amount is used. Further, in a frame with a sufficiently bright average luminance level, an image quality improvement effect by white boost can be sufficiently obtained, and therefore an illuminance control characteristic curve having a relatively large illuminance enhancement amount is used.

  As an example of white boost control based on the control signal 2, the illuminance control characteristic curve (5) is used in the frame with the highest achromatic ratio based on the control signal 2 output from the signal level detection unit 8, and the least The illuminance control characteristic curve (1) is used in a frame with a low coloration rate. Further, at the intermediate level of the video color ratio, one of the illuminance control characteristic curves (2) to (4) is used according to the video color ratio level. The relationship between the image coloring level and the illuminance control characteristic curve to be used is determined in advance.

  As described above, in a frame with a low achromatic color ratio (that is, a high chromatic color ratio), the pixel area of the chromatic color area is relatively large. Therefore, if white boost is applied too much, the chromatic color area is compared with the achromatic color area. The image appears to be darker and the image is dull and the vividness is reduced. Therefore, an illuminance characteristic curve having a smaller impulse enhancement amount by white boost is used as the chromatic color region is larger.

The white boost control according to the average luminance level according to the control signal 1 as described above and the white boost control according to the video coloring ratio according to the control signal 2 may be performed so that only one of them is executed. Alternatively, both controls may be performed simultaneously.
When both controls are performed, an illuminance control characteristic curve to be used is determined based on both control signals of the average luminance level by the control signal 1 and the video coloring ratio by the control signal 2. In this case, an illuminance characteristic curve corresponding to the level of each control signal may be determined in advance in a table or the like.

  As described above, by detecting the average luminance level and video coloring rate for each frame of the video to be displayed and selecting the optimal illuminance control characteristic curve according to the detection result, the illuminance of white boost It is possible to alleviate and reduce color dullness due to an extreme illuminance difference between the achromatic image portion and the chromatic image portion generated by the enhancement, and improve the visual color reproducibility of the projected image.

  In the above example, the illuminance control characteristic curves are five types (1) to (5), but the number of illuminance control characteristic curves to be prepared and their control characteristics are naturally limited to the above example. For example, more types of illuminance control characteristic curves can be set, and conversely, for example, only two types of illuminance control characteristic curves may be selected.

FIG. 4 is a flowchart for explaining an example of white boost control processing by the projector of the present invention.
First, the video receiver 9 receives image data for one frame to be displayed (step S1). In this case, as shown in FIG. 1, the luminance component data and the color component data may be obtained by receiving the RGB signal and converting it into a Yuv signal, and the luminance signal Y and the color difference signal (for example, uv). Signal, etc.) may be received.

  The signal level detection unit 8 uses the image data to be displayed to detect achromatic pixels for each frame (step S2), bright pixel detection (step S3), and average luminance level detection (step S4). The detection of the image coloring rate (step S5) is performed in parallel. Note that these detection processes may be sequentially performed in a specific order.

Based on the obtained average luminance level detection signal (control signal 1) and video color ratio detection signal (control signal 2), it is first determined for each frame whether there is an achromatic pixel (step S6). . If there is no achromatic pixel here, a projection image is generated without increasing the illuminance by white boost in that frame (step S12).
If there is an achromatic pixel, it is further determined whether or not the average luminance level of the frame is equal to or higher than a predetermined level (referred to as S5) (step S7).

  If the average luminance level of the frame is not equal to or higher than the predetermined level (S5), a projection image is generated in the frame without increasing the illuminance by white boost (step S12). If the average luminance level of the frame is equal to or higher than the predetermined level (S5), the illuminance enhancement amount is determined from the average luminance level detection signal (control signal 1) / video color ratio detection signal (control signal 2) (step S8). . Here, the prepared illuminance control characteristic curve as described above can be selected, and the illuminance enhancement amount of the video signal can be determined according to the illuminance characteristic control curve.

Then, the detected achromatic pixel and the bright pixel that is brighter than the predetermined level (S2) are determined (step S9), and white enhancement is performed so that the illuminance enhancement corresponding to the selected illuminance control characteristic curve is performed on the pixel. The boost control circuit 71 is operated (step S10).
Note that when white boost control is performed for the next frame continuously in the video, the processing is performed again from step S1.

  In the above embodiment, the projector device has been shown to receive image data from the outside. However, the present invention is not limited to this. The projector device receives image signals such as analog or digital television broadcasts and generates image data. It may be a form having a tuner inside. In addition, the projector device includes an input unit (not shown) through which various processing instructions are input by a user's operation, and can change setting contents and control contents in the control unit 7 in accordance with setting instructions input to the input unit. Form may be sufficient.

  In the above-described embodiment, a projector that projects an image onto an external screen or the like is shown. However, the present invention is not limited to this, and includes a transmissive screen (not shown). 4 may be a rear-projection type projector apparatus that projects an image.

It is a block diagram for describing one embodiment of a projector according to the present invention. It is a block diagram for demonstrating the structural example of the signal level detection part with which one Embodiment of the projector of this invention is provided. It is a figure which shows the example of the illumination intensity control characteristic of the projection image by the white boost control according to an input video signal. It is a flowchart for demonstrating an example of the white boost control process by the projector of this invention. It is a figure for demonstrating an example of the white boost control which reinforces the illumination intensity of the achromatic region contained in an image.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Light source, 2 ... Color wheel, 3 ... Image device, 4 ... Projection optical system, 5 ... Color wheel drive part, 6 ... Image device drive part, 7 ... Control part, 8 ... Signal level detection part, 9 ... Image reception , 71 ... White boost control circuit, 81 ... RGB-Yuv conversion circuit, 82 ... uv level detection circuit, 83 ... Y level detection circuit, 84 ... Y signal integration circuit, 85 ... colored pixel counting circuit, 86 ... achromatic color detection Reference numeral 87: Bright portion detection circuit; 88: Video average level detection circuit; 89: Video color ratio detection circuit.

Claims (6)

In a projector apparatus including a light source, an image device that generates an image by modulating light emitted from the light source, and a projection optical system that projects an image generated by the image device,
The projector includes an achromatic region detecting unit that detects an achromatic region for each frame of image data to be projected, and a bright region detecting unit that detects a bright region of a predetermined level or more for each frame of the image data. And illuminance enhancing means for enhancing the illuminance of the projected image,
The illuminance enhancing means enhances the amount of light used for generating a projection image for the achromatic area detected by the achromatic color area detecting means and the bright area detected by the bright area detecting means. By increasing the illuminance of the projected image ,
The projector device includes an average luminance level detecting means for detecting an average luminance level for each frame of image data to be projected, and a coloring for detecting a coloring rate representing a degree of an achromatic region for each frame of the image data to be projected. Having rate detection means,
The illuminance enhancement means changes the amount of enhancement of the projected image according to the average luminance level detected by the average luminance level detection means and the color ratio detected by the color ratio detection means, A plurality of illuminance control characteristic curve data defining the relationship between the brightness level of the image data to be projected and the illuminance obtained from the projection image are held, and the plurality of illuminance controls are performed according to the average luminance level and / or the color ratio. A projector apparatus comprising: selecting any one of characteristic curve data and performing illuminance enhancement according to the selected illuminance control characteristic curve . 2. The projector according to claim 1 , wherein when the plurality of illuminance control characteristic curves are selected, the illuminance enhancing unit increases the illuminance as the average luminance level is higher and the achromatic region is higher. A projector device characterized by selecting a large amount of illuminance control characteristic curve. 3. The projector according to claim 1 , wherein the chromaticity detection unit detects the chromaticity rate by a ratio of an achromatic region and an achromatic region for each frame according to a detection result of the achromatic region detection unit. A projector device characterized by that. 3. The projector according to claim 1 , wherein the color ratio detection unit assigns a weight to a difference in RGB signal level for each frame, and increases the weight as the level difference increases, and integrates the weight in the frame. A projector apparatus characterized by determining a coloration rate in a frame by doing so. The projector apparatus according to any one of claims 1 to 4, wherein the projector apparatus, RGB three colors color filters, and have a color wheel with W filter for transmitting light source light, wherein the image device The projection image light is generated by the light transmitted through the filter of the color wheel, and the illuminance enhancement means enhances the illuminance of the projection image by enhancing the amount of light used by the light source light that has passed through the W filter. A projector device. 6. The projector apparatus according to claim 5 , wherein the projector apparatus is a DLP projector apparatus including a DMD element as the image device.

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