JP2010169837A - Projector display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of degradation of life in an AC light source resulting from uneven flying direction of arc upon switching of polarity. <P>SOLUTION: A projector display device includes: an AC light source 12 which supplies light; and rotating color selection filters 3 which cyclically change a plurality of color selection filters that can select a specified color of lights from the AC light source 12. In the rotating color selection filters 3, a specified number of color selection filters are arranged next to each other in ascending order according to the time required for replacement. The AC light source 12 switches polarity coincident with the replacement of the color selection filters in the rotating color selection filter 3, except the replacement among the given number of the color selection filters. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a projection display device using a color selection filter.

  A conventional projection display device uses a light source unit that emits a certain amount of light source, and a rotary color selection filter having a plurality of color selection filters that can select a specific color from the light of the light source, to display colors in time series. The color was selected by using the afterimage phenomenon of the eye.

  For example, a color selection filter generally has R (red), G (green), B (blue), and W (white). When the R color selection filter is rotated, an R signal is used. When the G color selection filter rotates, the image is formed by the G signal. When the B color selection filter rotates, the image is formed by the B signal, and the W color selection is performed. When the filter rotates, an image is formed by the W signal, and a color image is created by synthesizing these in time series.

  However, in the configuration as described above, since the color ratio cannot be optically changed once the optical characteristics of the color selection filter are determined, the method of changing the output of the light source in synchronization with the color selection filter is generally used. It is becoming the target.

  In this method, for example, when it is desired to strengthen the red color, the power of the light source is increased only during the period when the red color selection filter is used, and the power of the light source is reduced by that amount using another color selection filter. In total, the power of the light source is intended to maintain the rating.

  When an AC light source is used, the polarity is switched at the boundary of each color selection filter to avoid flicker on the screen as much as possible (see Patent Document 1 and Patent Document 2).

JP 2008-146837 A JP 2006-227440 A

  When switching the polarity of the light source at the boundary of each color selection filter, if there is a large difference in the rotation angle of each color selection filter, it is difficult to equalize the direction of the arc flying by switching the polarity, resulting in a reduction in the number of electrodes. There was a problem of deterioration of lifetime.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to make the time of two polarities of an AC light source close to each other evenly in order to reduce the reduction of the electrode as much as possible.

  The projection display device according to the present invention includes an AC light source that supplies light, and a color selection filter unit that cyclically changes a plurality of color selection filters that can select a specific color from the light from the AC light source. The color selection filter unit arranges a predetermined number of color selection filters from the color selection filter with the smallest change time interval in an adjacent order in the circulation, and the AC light source includes the predetermined number of color selection filters. The polarity is switched in synchronism with the change of the color selection filter in the color selection filter unit, except for the change in.

  According to the first aspect of the present invention, in the projection display device, the AC light source that supplies light and the plurality of color selection filters that can select a specific color from the light from the AC light source are cyclically changed. The color selection filter unit arranges a predetermined number of color selection filters from the color selection filter having the smallest change time interval in the order adjacent to each other in the circulation, and the AC light source includes Since the time in the arc flying direction is equalized by switching the polarity in synchronization with the change of the color selection filter in the color selection filter unit, except for the change between the predetermined number of color selection filters, the AC light source This is advantageous in that the life of the light source is prolonged compared to the case where the electrode is partially reduced.

It is a block diagram of the rotation type color selection filter which shows Embodiment 1 of this invention. It is a block diagram of the rotation type color selection filter which shows Embodiment 2 of this invention. It is a block diagram of the rotation type color selection filter which shows Embodiment 3 of this invention. It is an example of the block diagram of the conventional rotation type color selection filter. It is an example of the block diagram of the conventional rotation type color selection filter. It is a principle explanatory view of a projection type display device using DMD (Digital Mirror Device), CW (Color Wheel), and DLP (Digital Light Processing). It is a drive principle diagram of an alternating current light source. It is a functional diagram of a rotation type color selection filter in a projection display device using DMD, CW, and DLP.

<A. Embodiment 1>
<A-1. Configuration>
FIG. 6 is a configuration diagram of a projector system that is a projection display device using one spatial light modulation device 100 including a plurality of movable mirror elements.

  Light emitted from the AC light source 12 is reflected / condensed by the reflector 2 and is incident on the light pipe 4 in a state where a specific color is selected by passing through the rotary color selection filter 3 as a color selection filter unit. The

  The light that has undergone rectangular conversion and uniformization by the light pipe 4 is irradiated to the spatial light modulator 100 by the relay lens 5, and by controlling the orientation of the plurality of mirror elements arranged in the spatial light modulator 100, An image is formed by switching control whether or not to enter the projection lens 6, and the image is projected on the screen by the projection lens 6.

<A-2. Operation>
The rotary color selection filter 3 as a color selection filter unit selects a specific wavelength in a time series by rotating, and creates a color by utilizing an afterimage phenomenon of an observer's eyes.

  FIG. 8 illustrates this principle. For example, generation of an image 10 (see FIG. 8A) will be described as an example. When the condensed spot of the lamp exists in the R (red) portion of the rotation type color selection filter 3, the reflection angle of the light is directed toward the projection lens 6 only in the portion of the image that is desired to be generated. Similarly, the mirror of the portion constituting the spatial light modulator 100 is turned on, and an R (red) region is formed on the screen (see FIG. 8B).

  Next, when the rotary color selection filter 3 is further rotated and the condensed spot of the lamp is present in the G (green) portion of the rotary color selection filter 3, only the green component in the image to be generated is present. Thus, the mirror of the portion constituting the spatial light modulator 100 is turned on so that the reflection angle of the light is directed toward the projection lens 6, and a G (green) region is formed on the screen (see FIG. 8C).

  Thereafter, as described above (refer to FIGS. 8D to 8G), the mirror of the spatial light modulator 100 corresponding to the color where the condensed spot of each lamp exists is turned on, and the time passes. Thus, colors are sequentially formed on the screen, and color pixels are formed using the afterimage phenomenon of the human eye.

  Moreover, the alternating current light source 12 shown in FIG. 7 has a direction in which an arc flies alternately in time, and is normally driven at several hundred Hz. FIG. 7A shows time on the horizontal axis and the polarity in the AC light source 12 on the vertical axis, and it can be seen that the arc direction changes and the polarity in the AC light source 12 changes. As the time for the arc to fly from the left to the right (see FIG. 7B) and the time for the arc to fly from the right to the left (see FIG. 7C) are equal, the reduction of the electrode 13 is reduced. The lifespan of the product will be longer. On the other hand, if there is a difference between the time when the arc flies from the left to the right and the time when the arc flies from the right to the left, it causes a reduction in the number of electrodes and degrades the life of the AC light source 12.

  In the projection display device using the rotary color selection filter 3, when combined with such an AC light source 12, the arc flying direction of the AC light source 12 is switched at the boundary between the color selection filters of the rotary color selection filter 3. Therefore, it is difficult to see unnatural brightness fluctuations on the screen. Therefore, control for switching the polarity of the AC light source is often performed in synchronization with the change of the color selection filter.

  FIG. 5 is an example. FIG. 5A shows the configuration of the color selection filter of the rotary color selection filter 3. As shown in FIG. 5B, the polarity of the AC light source 12 is changed in synchronization with the change of the color selection filter. Switching. FIG. 5B shows time on the horizontal axis and the polarity of the AC light source 12 on the vertical axis.

  By the way, in recent years, for the purpose of improving the reproducibility of complementary colors, a color selection filter for selecting a complementary color with respect to a color selected by the rotary color selection filter 3 such as cyan and yellow is increasing. The complementary color selection filter currently has a small range of rotation angles with respect to the primary color selection filter and the white selection filter which are the colors selected by the rotary color selection filter 3.

  In such a case, for example, the rotational color selection filter 3 is arranged as shown in FIG. FIG. 4A is a configuration diagram of the color selection filter of the rotary color selection filter 3. As shown in FIG. 4B, the polarity of the AC light source 12 is switched in synchronization with the change of the color selection filter. Yes. FIG. 4B shows time on the horizontal axis and the polarity of the AC light source 12 on the vertical axis. As shown in FIG. 4B, the time for the arc of the AC light source 12 to fly from the right to the left is longer than the time for the arc to fly from the left to the right. Yes. For this reason, the lifetime of the AC light source 12 is deteriorated.

  Therefore, the present invention is configured as follows in order to solve the above problems. That is, in FIG. 1 showing the case according to the first embodiment of the present invention, as shown in FIG. 1A, the rotation angle (filter angle) is the smallest (in other words, the change time interval is the smallest). The (Y) selection filter and the cyan (C) selection filter are arranged next to each other, and further, as shown in FIG. 1B, the boundary between the yellow selection filter (Y) and the cyan selection filter (C). By not switching the polarity in step, it is possible to make the time interval for switching the polarity uniform, and to minimize the decrease in the number of electrodes.

<A-3. Effect>
According to the first embodiment of the present invention, in the projection display device, the AC light source 12 that supplies light and a plurality of color selection filters that can select a specific color from the light from the AC light source 12 are cyclically arranged. A rotation type color selection filter 3 that is a color selection filter unit to be changed to, and the rotation type color selection filter 3 has a predetermined number, for example, two colors of yellow and cyan, from the color selection filter having the smallest change time interval. The selection light sources are arranged in the adjacent order in the rotation, and the AC light source 12 changes the polarity in synchronization with the change of the color selection filter in the rotary color selection filter 3 except for the change between the yellow and cyan color selection filters. By switching, the angles corresponding to the time intervals of the rotation type color selection filters 3 of red (R), green (G), yellow + cyan (Y + C), white (W), and blue (B) are almost equal. interval Lined Therefore, bipolar time arc AC source 12 is substantially equal, eliminating uneven usage of electrodes, the life of the light source can be achieved. In addition, since the time of both polarities of the arc can be equalized regardless of the periodicity of the rotary color selection filter 3, for example, the polarity is switched evenly during one cycle (one rotation) of the rotary color selection filter. There is no need to consider cases.

  According to the first embodiment of the present invention, in the projection display device, a predetermined number of the rotary color selection filter 3, for example, two color selection filters of yellow and cyan are two yellow and cyan colors. A color selection filter that can select a complementary color that can be selected by a color selection filter other than the color selection filter (for example, blue or red). In the change, the polarity of the AC light source 12 is not switched, and the time interval for switching the polarity can be equalized.

  Further, according to the first embodiment of the present invention, in the projection display device, by assigning two color selection filters as a predetermined number of color selection filters to two colors of yellow and cyan as complementary colors, When changing between the color selection filters, the polarity switching time interval can be equalized without switching the polarity.

  Further, according to the first embodiment of the present invention, the projection display device includes the rotary color selection filter 3 as the color selection filter unit, and the time interval for changing the color selection filter is defined by the filter angle. The color selection can be performed cyclically, the order of the color selection filters in the rotary color selection filter 3 is appropriately determined, and the polarity switching time interval of the AC light source 12 is controlled by controlling the polarity switching. Equalization is possible.

<B. Second Embodiment>
<B-1. Configuration>
FIG. 2A is a configuration diagram of the rotary color selection filter 3 when a magenta (M) selection filter is arranged instead of the white selection filter. The configuration of the projection display device other than the rotary color selection filter 3 is the same as that in the first embodiment, and a description thereof is omitted.

  Also in the case of the second embodiment, the yellow and magenta colors with the smallest rotation angle are arranged next to each other.

<B-2. Operation>
As shown in FIG. 2B, the yellow and magenta colors with the smallest rotation angle are arranged next to each other, and the polarity is switched at the boundary between the yellow (Y) selection filter and the magenta (M) selection filter. By not performing it, it is possible to realize the uniformity of the polarity and to minimize the loss of the electrode.

<B-3. Effect>
According to the second embodiment of the present invention, in a projection display device, two color selection filters as a predetermined number of color selection filters are assigned to two colors of yellow and magenta as complementary colors, so that the color selection is performed. When changing between filters, the polarity is not switched, and the time interval for switching the polarity can be equalized.

<C. Embodiment 3>
<C-1. Configuration>
FIG. 3A is a configuration diagram of the rotary color selection filter 3 when the magenta, yellow, and cyan selection filters having the smallest angles are arranged adjacent to each other. The configuration of the projection display device other than the rotary color selection filter 3 is the same as that in the first embodiment, and a description thereof is omitted.

<C-2. Operation>
As shown in FIG. 3B, the three complementary color selection filters are arranged adjacent to each other without any other colors, and at the two boundaries between the three complementary colors where the angle of the rotary color selection filter 3 is small. Without switching the polarity, the three complementary colors can be regarded as one color selection filter and the polarity can be switched.

  When the total rotation angle of the three complementary color selection filters is substantially equal to the angles of the other primary colors (red, blue, green) or the white selection filter, the times of both polarities are approximately equal, and the life of the light source is increased. It becomes an effective means.

<C-3. Effect>
According to the third embodiment of the present invention, in the projection display device, the complementary color for the primary colors (red, blue, green) is any one of yellow, cyan, and magenta. When changing the color selection filter at, the polarity of the alternating current light source 12 is not switched, and this makes it possible to equalize the time interval for switching the polarity.

  2 reflector, 3 rotary color selection filter (CW), 4 light pipe, 5 relay lens, 6 projection lens, 10 image, 12 AC light source, 13 electrode, 100 spatial light modulator (DMD).

Claims (6)

An AC light source that supplies light;
A plurality of color selection filters capable of selecting a specific color from the light from the AC light source, and a color selection filter unit that cyclically changes,
The color selection filter unit arranges a predetermined number of color selection filters from the color selection filter having the smallest change time interval in an adjacent order in the circulation,
The AC light source, except for the change between the predetermined number of color selection filters, switches polarity in synchronization with the change of the plurality of color selection filters in the color selection filter unit,
Projection display device. The predetermined number of color selection filters are color selection filters capable of selecting complementary colors that can be selected by a color selection filter other than the predetermined number of color selection filters.
The projection display device according to claim 1. The complementary color is one of yellow, cyan, and magenta.
The projection type display device according to claim 2. The predetermined number of color selection filters are two color selection filters;
The complementary colors are two colors of yellow, cyan and magenta.
The projection display device according to claim 2 or 3. The predetermined number of color selection filters are two color selection filters;
The complementary colors are yellow and cyan.
The projection type display apparatus in any one of Claims 2-4. The color selection filter unit is a rotary color selection filter, and the time interval of the change is defined by a filter angle.
The projection type display device according to claim 1.

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