JP3369288B2 - Projection display device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type display device such as a liquid crystal projector which converts a video signal into projection light and projects it on a screen.

[0002]

2. Description of the Related Art FIG. 11 shows an example of a liquid crystal projector which is a conventional projection type display device. Reference numeral 1 is a white light source such as a halogen lamp, 2 is a dichroic mirror that functions as a spectral filter and a mirror, 3 is a total reflection mirror, 4 is a liquid crystal light shielding plate, 5 is a cross dichroic prism mirror arranged by crossing dichroic mirrors, and 6 is projection. It is a lens.

Next, the operation will be described. White light is generated from the white light source 1, only specific wavelengths are reflected by the dichroic mirror 2, and other wavelengths are transmitted to perform spectral analysis. R by using two of these dichroic mirrors
Disperse into (red), G (green), and B (blue) colors. The total reflection mirror 3 reflects them, and the liquid crystal light-shielding plate 4 makes them R,
The intensity of G and B lights is controlled to form an image, the lights are combined by the cross dichroic prism mirror 5, and enlarged by the projection lens 6 and projected on the screen.

[0004]

In the conventional projection display apparatus, when the white light source has a variation in light output sensitivity or a change over time, the color temperature changes and the chromaticity of the projected image changes. This change in chromaticity could not be adjusted. Also, since there is only one white light source, when the white light source fails and disappears, the light output information is completely lost. Further, if there is only one white light source, the brightness of the image on the screen is affected by the projection distance, the projection angle, the brightness of the surroundings, etc., and it is not possible to obtain sufficient brightness of the image.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to adjust chromaticity, obtain a sufficient brightness of an image, and obtain light output information even when a light source fails. The aim is to obtain a projection display device that is not lost.

As prior arts relating to these, the followings have been proposed. In Japanese Unexamined Patent Publication No. 62-254589, a large amount of light is obtained by synthesizing and projecting light that has passed through R, G, and B filters and a liquid crystal panel from three halogen lamps. In Japanese Patent Laid-Open No. 4-147120, almost the same as the above, the lights transmitted through the liquid crystal panel from the three R, G, and B light sources are combined and projected. The effect is a large amount of light, which facilitates assembly, installation and adjustment.

In Japanese Patent Laid-Open No. 11492/1992, a plurality of light sources are used to improve brightness and even if one light source is cut off, another light source is used for backup. In Japanese Patent Laid-Open No. 60-125891, a liquid crystal panel for displaying an image has a narrow voltage range (dynamic range) capable of producing a halftone. Therefore, when the image input signal is large, the light amount of the lamp is increased, and when the image input signal is small, the lamp is increased. Control to reduce the amount of light.

In Japanese Laid-Open Patent Publication No. 4-319930, when a sensor for detecting the temperature of a light source detects an excessive rise in the temperature of the light source, the light output of the light source is reduced, and the decrease in brightness due to the reduction of the light output of the light source is compensated. In the video signal processing circuit
The drive of GB is increased, and the drive of blue is increased to raise the color temperature of white in order to give an apparent brightness, thereby compensating for the decrease in brightness. In Japanese Patent Laid-Open No. 4-293035, two light sources of a metal halide lamp are provided, and a temperature sensor that detects the temperature of the light source turns on a lamp that can be turned on (a lamp with a low temperature), so that re-lighting after continuous lighting is facilitated. To do. Further, if both can be turned on, a counter that counts the lighting time determines which of the light sources is turned on.

[0009]

According to claim 1 of the present invention,
In the projection type display device, the light from the light source having the three color components of R, G, B is split into three colors, and the split light is projected through the liquid crystal type light shielding plate through the lens. Is used as a plurality of light sources, at least one of the light sources is a light source whose color temperature can be adjusted, and an optical combiner for combining lights from these light sources is provided.

According to a second aspect of the present invention, in the first aspect, a filter for reducing light of a predetermined band color is provided.

According to a third aspect of the present invention, in the second aspect, the filter is a plurality of filters that reduce light having different band colors, and one of the plurality of filters is selected to obtain a predetermined band color. A filter selection mechanism for reducing light is provided.

According to a fourth aspect of the present invention, in the second aspect, the filter is a liquid crystal light-shielding plate whose light transmittance is variable by a control signal.

According to a fifth aspect of the present invention, in the second aspect, the filter is a liquid crystal plate whose color is changed by a control signal.

According to a sixth aspect of the present invention, in any one of the third to fifth aspects, a color temperature sensor for detecting the color temperature of at least one of the light transmitted through the filter and the light from the photosynthesizer, The adjusting means adjusts the color temperature of the light passing through the filter according to the output of the color temperature sensor.

A seventh aspect of the present invention is the color temperature sensor according to any one of the third to fifth aspects, which detects a color temperature of at least one of the light transmitted through the filter and the light from the photosynthesizer. According to the output of the color temperature sensor, the filter is provided with an adjusting means for adjusting the color temperature and adjusting the light quantity of the light source on the side where the filter is mounted.

According to claim 8 of the present invention, in any one of claims 3 to 5, an optical sensor for detecting the amount of light entering the photosynthesizer from the light source, and the amount of light of the light source according to the output of the optical sensor. And a drive circuit for adjusting.

A ninth aspect of the present invention corresponds to the optical sensor according to any one of the third to fifth aspects, which detects the amount of light entering each photosynthesizer from each light source, and the output of the optical sensor. A drive circuit that adjusts the light amount of the light source, a color temperature sensor that detects the color temperature of the light from the photosynthesizer, and an adjusting unit that adjusts the color temperature of the filter according to the output of this color temperature sensor. is there.

According to a tenth aspect of the present invention, in any one of the third to fifth aspects, an optical sensor for detecting the amount of light from the photosynthesizer and the amount of light of each light source are adjusted according to the output of the optical sensor. A drive circuit, a color temperature sensor that detects the color temperature of light from the photosynthesizer, and an adjusting unit that adjusts the color temperature of the filter according to the output of the color temperature sensor are provided.

The eleventh aspect of the present invention is the R, G, B 3
In a projection type display device that splits light from a light source having a color component into three colors and projects the split light through a liquid crystal type light-shielding plate through a lens, the light sources are a plurality of light sources. , A light combiner for combining the light from these light sources, a color temperature sensor for detecting the color temperature of at least one of the light from the light source and the light from the light combiner, and depending on the output of the color temperature sensor And a drive circuit for adjusting the light amount of the light source.

[0020]

According to the first aspect of the present invention, the color temperature of at least one of the plurality of light sources is adjusted, the light from these light sources is combined by the photosynthesizer, and then the light is split into three colors.
The separated light is projected through the liquid crystal type light shielding plate and the lens.

According to the second aspect of the present invention, the color temperature is adjusted by the filter for reducing the light of the predetermined band color.

According to the third aspect of the present invention, the filter selecting mechanism selects one of the plurality of filters for reducing the light of different band colors, and reduces the light of a predetermined band color.

According to a fourth aspect of the present invention, a filter of a liquid crystal light shielding plate whose light transmittance is variable by a control signal is used to adjust the color temperature by changing the light transmittance.

According to a fifth aspect of the present invention, a filter of a liquid crystal plate whose color is changed by a control signal is used to adjust the color temperature by changing the color.

According to a sixth aspect of the present invention, a color temperature sensor detects the color temperature of at least one of the light transmitted through the filter and the light from the photosynthesizer, and the adjusting means detects the color temperature of the light. To adjust the color temperature of the light passing through the filter.

According to a seventh aspect of the present invention, the color temperature sensor detects the color temperature of at least one of the light transmitted through the filter and the light from the photosynthesizer, and the adjusting means determines the color temperature according to the output of the color temperature sensor. The color temperature is adjusted by the filter and the light quantity of the light source on the side where the filter is mounted is adjusted.

According to an eighth aspect of the present invention, the light sensor detects the amount of light entering the photosynthesizer, the drive circuit adjusts the light amount of the light source according to the output of the light sensor, and the filter controls the color temperature. Adjust.

According to a ninth aspect of the present invention, an optical sensor detects the amount of light entering each photosynthesizer from each light source, and a drive circuit adjusts the amount of light of the corresponding light source according to the output of the optical sensor. The color temperature sensor detects the color temperature of the light from the photosynthesizer, and the adjusting means adjusts the color temperature of the filter according to the output of the color temperature sensor.

A tenth aspect of the present invention is an optical sensor,
The amount of light from the photosynthesizer is detected, the drive circuit adjusts the amount of light from each light source according to the output of this photosensor, the color temperature sensor detects the color temperature of the light from the photosynthesizer, and the adjustment means, The color temperature of the filter is adjusted according to the output of the color temperature sensor.

According to the eleventh aspect of the present invention, the color temperature of at least one of the light from the plurality of light sources and the light from the photosynthesizer is detected, and the light amount of the light source is adjusted according to this detection signal. After the light from the light source is combined by the light combiner, this light is divided into three colors, and the separated lights are projected through the liquid crystal type light shielding plate and the lens.

[0031]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 2 to 6 are the same as the conventional configuration of FIG. 1-1 and 1-2 are white light sources,
It is a light source having light components of three colors of RGB. 7 is an optical combiner using a prism mirror for combining the white light source 1 of FIG.
Reference numeral 8 denotes a filter for reducing a predetermined band color of the white light source 1. This filter is detachable and can be easily replaced with a filter having a different band color. Also, for this filter, for example, a red component removal filter that attenuates the red component characteristic is used because the blue component decreases with the aging of the lamp. 9-1, 9-2 are color temperature sensors for detecting the color temperature of the white light source 1, 10-1, 10
-2 is a drive circuit for driving the white light source 1, 11-1,
11-2 is a color temperature indicator, which is a color temperature sensor 9-1, 9
The detected value from -2 is displayed.

Next, the operation will be described. The drive circuits 10-1 and 10-2 in FIG. 1 drive the white light sources 1-1 and 1-2 to emit light. The light from the white light sources 1-1 and 1-2 is detected by the color temperature sensors 9-1 and 9-2, and the color temperatures are displayed on the display devices 11-1 and 11-2. It is combined in 7 and is incident on the dichroic mirror 2. After that, the image is enlarged and projected on the screen as in the conventional operation.

As described above, several kinds of filters for reducing different band colors are prepared, and the color temperature of the white light source 1-1 is adjusted by selecting a filter having a desired band color from the filters, and The chromaticity of the projected image can be adjusted. The color temperature adjustment is performed by adjusting the color temperature sensors 9-1 and 9-2 and the color temperature indicators 11-1 and 11-.
2 can be adjusted while monitoring the color temperature. Further, even if one of the white light sources is cut off, one of the white light sources can back up. Further, if one light source is used, sufficient brightness cannot be obtained, and the brightness of the image on the screen may not be sufficient, but if two light sources are used, sufficient brightness can be obtained.

The color temperature is different even with only the white light source. For example, the color temperature can be adjusted by combining a light source with a large amount of red component and a light source with a large amount of blue component. In this case, the brightness (light amount) of the light source is changed by adjusting the power supply voltage supplied to the light source, and the color temperature can be changed accordingly. Therefore, the color temperature can be adjusted by appropriately combining the white light sources (any light source other than the white light source including the R, G, and B components) and adjusting the supply voltage (or current) to the light sources. . Furthermore, if a filter is inserted into at least one light source of the white light source and the color temperature is adjusted with this filter, finer adjustment and a wider adjustment range can be performed. Therefore,
A combination of a white light source and a filter can be regarded as one light source whose color temperature can be adjusted. Further, even if there are two light sources having the same characteristics (for example, a metal halide lamp), two light sources having different color temperatures can be obtained by inserting a filter in at least one of them.

In FIG. 1, the filter 8 is replaced with the white light source 1-
Although the filter is used for No. 1, a filter may also be used for the white light source 1-2 and adjustment may be made for both.

Example 2. The filter 8 has several types of filters for reducing different band colors prepared in advance, and a filter having a desired band color is selected from the filters. However, the filter 8 is, for example, a peripheral part of a rotating disk. A plurality of filters for sequentially reducing different band colors may be arranged on a concentric circle, and a filter selection mechanism for rotating this rotary disk with a motor or the like may be provided to sequentially change the band colors.

Further, the filter 8 for changing the color temperature may be a filter using a liquid crystal panel other than the filter described above. For example, a color filter whose color changes with a control signal, and if the color is red, the density of red changes,
It is also possible to use a control signal in which the color is sequentially changed from red to purple.

In addition, a liquid crystal panel that changes the light transmittance by a control signal to change the color temperature may be used.

Since the color temperature can be easily changed by the filter as described above, the adjustment is easy and a wide adjustment range can be obtained. Further, as described in the first embodiment, the light source itself has its own color temperature, and the color temperature can be changed by combining these light sources and changing the brightness by the power supply to the light source. Therefore, better adjustment is possible in combination with the color temperature adjustment by the filter.

Example 3. This embodiment is shown in FIG. In the figure, a color temperature sensor 9 and a color temperature indicator 11 measure the color temperature of the light on the output side of the photosynthesizer 7. In Example 1, the color temperature was measured for each of the white light sources 1-1 and 1-2, but in this Example, the color temperature of the light on the output side of the photo-combiner 7 can be monitored, so that the color of the projected image This can be approximated to the case of directly monitoring the degree. However, the color temperature of each white light source cannot be monitored as in the first embodiment.

Example 4. This embodiment is not shown,
This is a combination of the first embodiment and the second embodiment. That is, the color temperature sensors 9-1 and 9-2 and the color temperature indicators 11-1 and 11-2 shown in FIG. 1 and the color temperature sensor 9 and the color temperature indicator 11 shown in FIG. Since the color temperature can be adjusted while monitoring the color temperature of each light source and the color temperature of the combined light, the color temperature can be adjusted more easily.

Example 5. This example is shown in Figure 3a. In FIG. 3a, 14 is an adjustment circuit for adjusting the color temperature, which receives the signal from the color temperature sensor 9-1 and changes the color temperature of the filter 8 for adjustment.

As described in the second embodiment, the filter 8 is a filter in which a plurality of filters for sequentially reducing different band colors are arranged on the concentric circles on the periphery of the rotating disk, and the rotating disk is rotated by a motor or the like. A selection mechanism is provided so that the band colors can be changed sequentially. The adjustment circuit 14 sets a predetermined color temperature in advance, compares the set value with the detection value of the color temperature sensor 9-1, and drives the filter selection mechanism according to the comparison result to drive the predetermined color. The filter 8 is automatically selected to reach the temperature.

Therefore, the chromaticity of the image can be always kept constant, and the chromaticity of a predetermined image can be obtained only by changing the set value. Further, a filter for changing the color temperature may be provided on the white light source 1-2 side as well, and the detection signal of the color temperature sensor 9-2 may be input to the adjustment circuit 14 for adjustment.

Further, when the filter 8 is a color filter whose color is changed by a control signal in the liquid crystal panel described in the second embodiment, the adjusting circuit 14 outputs this control signal to output the color temperature. May be adjusted.

Also, when the liquid crystal panel uses a filter that changes the light transmittance by the control signal to change the color temperature, the adjusting circuit 14 outputs the control signal to adjust the color temperature. Good.

Example 6. This example is shown in Figure 3b. In the case of FIG. 3a of the fifth embodiment, the detection signal from the color temperature sensor 9 is input to the adjusting circuit 14.
In this embodiment, since the adjustment is made based on the color temperature of the light on the output side of the light combiner 7, it is possible to make an adjustment with little deviation from the chromaticity of the projected image.

Example 7. This embodiment is shown in FIG. Figure 3
In b, only the white light source 1-1 side is adjusted,
Provide a filter equivalent to the filter 8 on the white light source 1-2 side,
The light from both light sources is adjusted respectively. This adjustment is performed, for example, by using a value of 1/2 of the deviation between the color temperature set value and the color temperature detection signal for each of the filters 8-1,
8-2 may be adjusted. Further, this deviation may be adjusted by dividing it by a predetermined ratio.

Example 8. In addition, in Example 7, the white light source 1
The brightness (light amount) of -1, 1-2 may be detected, and the deviation may be divided and adjusted by the ratio of the brightness. This example is shown in Figure 5a. The brightness of the white light sources 1-1 and 1-2 is detected by the optical sensors 12-1 and 12-2. This detection signal is input to the adjustment circuit 14, and the deviation is adjusted by the ratio of the two detection signals. In this way, the color temperature can be adjusted according to the decrease in the brightness of each white light source. On the contrary, the deviation may be divided according to the inverse ratio of the brightness of each white light source. In this case, the color temperature of the white light source having a large decrease in brightness also greatly decreases, so that the color temperature of the light source side having a large decrease in brightness can be adjusted.

Although the brightness of the white light source is directly detected in FIG. 5A, the filters 8-1, 8-
The brightness of the light transmitted through the light sensor 12-1, 12-2
It may be detected by.

Example 9. This example is shown in FIG. 6a. The adjustment circuit 14 not only changes the band color of the filter 8 according to the detection signal of the color temperature sensor 9-1, but also adjusts the output of the drive circuit 10-1 to adjust the brightness of the white light source 1-1. Since the color temperature also changes depending on the brightness adjustment,
It can be adjusted by the filter 8 and both.

The color temperature by the brightness adjustment of the white light source 1-1 and the color temperature adjustment by the filter 8 may be adjusted at a constant ratio. In addition, the brightness of the white light source 1-1 may be adjusted within a predetermined range, and the filter 8 may be adjusted for further adjustment. Since the brightness and the color temperature of the white light source 1-1 decrease with the lapse of time, the decrease can be corrected.

On the contrary to the above, the color temperature of the filter 8 may be adjusted within a predetermined range, and the brightness may be adjusted further by adjusting the brightness of the white light source 1-1. This is because when the adjustment range of the filter 8 is exceeded, the brightness of the white light source 1-1 is considerably lowered, and therefore the brightness is adjusted by the brightness adjustment.

Example 10. This example is shown in FIG. 6b.
In Example 9, as shown in FIG. 6a, only the color temperature adjustment on the white light source 1-1 side was performed, but in this Example, the white light source 1-2 was used.
The color temperature on the side is also adjusted. The color temperature of the output light from the photosynthesizer 7 can be adjusted to a predetermined color temperature by adjusting each light source. However, the cost of the projection display device is higher than that of the ninth embodiment.

Example 11. This example is shown in Figure 7a.
The color temperature of the output light of the light combiner 7 is detected by the color temperature sensor 9, and the color temperature is adjusted by the color temperature filter 8 according to the detection signal and the color temperature is adjusted by adjusting the brightness of the white light source 1-1. It is something to do. In this case, as in the ninth embodiment, the color temperature by the brightness adjustment of the white light source 1-1 and the color temperature adjustment by the filter 8 may be adjusted at a constant ratio. In addition, the brightness of the white light source 1-1 may be adjusted within a predetermined range, and the filter 8 may be adjusted for further adjustment. Since the brightness and the color temperature of the white light source 1-1 decrease with the lapse of time, the decrease can be corrected.

Contrary to the above (similar to the ninth embodiment), the color temperature of the filter 8 is adjusted within a predetermined range.
It may be adjusted by adjusting the brightness of the white light source 1-1 for more than that. This is because when the adjustment range of the filter 8 is exceeded, the brightness of the white light source 1-1 is considerably lowered, and therefore the brightness is adjusted by the brightness adjustment.

Example 12 In this embodiment, as shown in FIG. 7b, the white light sources 1-1 and 1-2 are provided with filters 8-1 and 8-2, respectively, to adjust the color temperature. In the eleventh embodiment, only the white light source 1-1 side is adjusted, but in this embodiment, both white light sources 1-1, 1- are based on the deviation between the detection signal of the color temperature sensor 9 and the preset color temperature setting value. Since the color temperature of 2 is adjusted, a better adjustment can be made.

This adjustment is performed, for example, at the white light source 1-1 side (color temperature adjustment by the filter 8-1 and the drive circuit 10) at a value of 1/2 of the deviation between the color temperature set value and the color temperature detection signal. -1 for adjusting the color temperature by adjusting the brightness of the white light source 1-1) and the white light source 1-2 side (for adjusting the color temperature in the filter 8-2 and the drive circuit 10-2).
The color temperature adjustment by the brightness adjustment 2) may be adjusted. Further, this deviation may be adjusted by dividing it by a predetermined ratio.

In this case, as in the ninth embodiment, the white light source 1
The color temperature by the brightness adjustment of -1 (white light source 1-2) and the color temperature adjustment by the filter 8-1 (filter 8-2) may be adjusted at a constant ratio. In addition, the brightness of the white light source 1-1 (white light source 1-2) may be adjusted within a predetermined range, and the filter 8 (filter 8-2) may be adjusted after that. Since the brightness and the color temperature of the white light source 1-1 (white light source 1-2) decrease over time, the decrease can be corrected.

Contrary to the above (though similar to the ninth embodiment)
Within a predetermined range, the filter 8-1 (filter 8-2)
The color temperature may be adjusted by adjusting the color temperature, and the brightness may be adjusted by adjusting the brightness of the white light source 1-1 (white light source 1-2). This is because when the adjustment range of the filter 8-1 (filter 8-2) is exceeded, the brightness of the white light source 1-1 (white light source 1-2) is considerably lowered, and therefore the brightness adjustment is made up for. is there.

Example 13. This example is shown in Figure 8a.
In the figure, the detection signals of the optical sensors 12-1 and 12-2 are fed back to the drive circuits 10-1 and 10-2, respectively, and adjusted so that the brightness (light amount) of the white light sources 1-1 and 1-2 is constant. . The color temperature sensor 9 is a photosynthesizer 7.
The color temperature of the output light is detected and displayed on the color temperature indicator 11. Further, the detection signals of the optical sensors 12-1 and 12-2 are displayed by the light amount indicators 13-1 and 13-2.

In this way, the amount of light of each of the white light sources 1-1 and 1-2 is adjusted to a constant value, and while monitoring the color temperature indicator 11, a filter for reducing a desired band color with the filter 8 is used. Adjust the color temperature. Therefore, each white light source 1-
It is possible to reduce the brightness by using 1 and 1-2 for each light source and independently adjust the color temperature by the filter 8.

The optical sensor 12-1 is a white light source 1-
Although the light amount of 1 is detected, the light sensor 12-1 may be arranged between the filter 8 and the light combiner 7 to detect the amount of light transmitted through the filter 8 and adjust the light amount. . In this case, the light amount after adjustment can be made constant by the filter 8.

Further, since the color temperature can be changed by adjusting the color temperature of the filter itself and changing the light amounts of the plurality of white light sources by the drive circuit, light sources of various color temperatures can be realized.

Example 14 This example is shown in FIG. 8b.
In this embodiment, the color temperature adjustment by the filter of the above-mentioned Embodiment 13 is automated. That is, the detection signal of the color temperature sensor 9 is input to the adjustment circuit 14, and the color temperature is adjusted by the filter 8 according to the detection signal. The filter 8 may be provided on the white light source 1-2 side for adjustment. The effect of this embodiment is similar to that of the thirteenth embodiment.

Example 15 This embodiment is a modification of the thirteenth and fourteenth embodiments and is shown in FIG. The color temperature is adjusted with a filter based on the color temperature detection signal of the color temperature sensor 9,
The light amount of the output light from the photosynthesizer 7 after the adjustment is measured by the optical sensor 1.
2 and the detection signal is detected by the drive circuits 10-2, 1
It is fed back to 0-2 to adjust the light quantity on the output side of the photosynthesizer to be constant. In this way, the amount of light projected onto the screen is constant, and the color temperature can be adjusted to a desired value. The effect of this embodiment is similar to that of the thirteenth embodiment.

Example 16. This example is shown in Figure 10a. In the above embodiment, the color temperature was adjusted by using the filter on one side, but in FIG. 10a, the color temperature is adjusted by adjusting the light amount of the light source without using the filter. The detection signal of the color temperature sensor 9 is input to the adjustment circuit 14, and the brightness (light amount) of the white light source 1-1 is adjusted based on this input to change and adjust the color temperature. This adjustment cannot be drastically adjusted because the life of the lamp is affected if the brightness of the light source is raised too much, but it is possible to adjust within a certain range.

The output of the color temperature sensor 9-1 may be used instead of the output of the color temperature sensor 9. The white light sources 10-1 and 10-2 may be adjusted by the outputs of the color temperature sensors 9-1 and 9-2, respectively.

Example 17 This embodiment is shown in Figure 10b and is a modification of Figure 10a. The output of the color temperature sensor 9 is input to the adjustment circuit 14, and both the white light sources 1-1 and 1-2 are adjusted according to the input value. This adjustment may be adjusted by dividing the input value by 1/2. Moreover, you may distribute at a predetermined ratio. The brightness of the light source may be detected and distributed according to the brightness, or the lighting time of the light source may be monitored and distributed according to the lighting time.

Example 18. In the above embodiment, two white light sources are used.
Although one is used, two or more may be used, that is, it can be applied to a plurality of light sources. Further, although the white light source is used in the above-mentioned embodiment, any light source having R, B, G components may be used instead of the white light source.

[0071]

As described above, according to the first aspect of the present invention, at least one of the plurality of light sources having the three color components of R, G, and B is a light source whose color temperature can be adjusted. Therefore, it is possible to obtain a projection type display device in which chromaticity can be adjusted, sufficient image brightness can be obtained, and light output information is not lost even when a light source fails.

According to the second aspect of the present invention, since the color temperature is adjusted by providing the filter for reducing the light of the predetermined band color, it is possible to easily adjust the color temperature.

According to the third aspect of the present invention, the filter is a plurality of filters for respectively reducing the light of different band colors, and one of the plurality of filters is selected to reduce the light of the predetermined band color. Since the filter selection mechanism is provided, the color temperature can be easily adjusted.

According to the fourth aspect of the present invention, the filter is a liquid crystal light shielding plate whose light transmittance is variable by a control signal, and the color temperature is adjusted by changing the light transmittance of the liquid crystal plate. Therefore, there is an effect that the color temperature can be easily adjusted.

According to the fifth aspect of the present invention, since the filter is a liquid crystal plate whose color is changed by a control signal and the color temperature is adjusted by changing the color, the effect that the color temperature can be easily adjusted is obtained. There is.

According to the sixth aspect of the present invention, since the color temperature of the light passing through the filter is adjusted according to the output of the color temperature sensor, there is an effect that the color temperature can be easily adjusted.

According to the seventh aspect of the present invention, since the color temperature of the light passing through the filter is adjusted according to the output of the color temperature sensor, the color temperature of the filter according to the output of the color temperature sensor is adjusted. And the light amount of the light source on the side where the filter is mounted are adjusted, so that there is an effect that the color temperature can be adjusted by both the filter and the light source.

According to the eighth aspect of the present invention, the light amount of each light source incident on the photosynthesizer is detected by the optical sensor, the light amount of the corresponding light source is adjusted according to the detected output, and the color temperature is adjusted by the filter. Is adjusted, the color temperature can be adjusted while adjusting the light amount of the light source.

According to the ninth aspect of the present invention, the light amount of each light source incident on the photosynthesizer is detected by the light sensor, and the light amount of the corresponding light source is adjusted according to the detected output. Since the color temperature of the light from the photosynthesizer is detected and the color temperature of the filter is adjusted according to the detected output, there is an effect that the color temperature can be adjusted while adjusting the light amount of the light source.

According to the tenth aspect of the present invention, the light quantity from the light combiner is detected by the light sensor, the light quantity of each light source is adjusted according to the detected output, and the light quantity from the light combiner is adjusted by the color temperature sensor. Since the color temperature is detected and the color temperature of the filter is adjusted according to the detected output, there is an effect that the color temperature can be adjusted while adjusting the light amount of the light source.

According to claim 11 of the present invention, R, G,
A plurality of light sources having three color components of B are used, the color temperature of at least one of the light from the plurality of light sources and the light from the photosynthesizer is detected, and the light amount of the light source is adjusted according to the detection signal. Thus, there is an effect that a chromaticity can be adjusted, sufficient image brightness can be obtained, and a projection type display device in which light output information is not lost even when a light source fails.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a projection type display device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a projection type display device according to a third embodiment of the present invention.

FIG. 3 is a configuration diagram of a main part of a projection type display device according to embodiments 5 and 6 of the present invention.

FIG. 4 is a configuration diagram of a main part of a projection type display device according to a seventh embodiment of the present invention.

FIG. 5 is a configuration diagram of a main part of a projection type display device according to an eighth embodiment of the present invention.

FIG. 6 is a configuration diagram of a main part of a projection type display device according to embodiments 9 and 10 of the present invention.

FIG. 7 is a configuration diagram of a main part of a projection display device according to examples 11 and 12 of the present invention.

FIG. 8 is a configuration diagram of a main part of a projection type display device according to embodiments 13 and 14 of the present invention.

FIG. 9 is a configuration diagram of a main part of a projection type display device according to a fifteenth embodiment of the present invention.

FIG. 10 is a configuration diagram of a main part of a projection type display device according to embodiments 17 and 18 of the present invention.

FIG. 11 is a configuration diagram of a conventional projection display device.

[Explanation of symbols] 1,1-1,1-2 White light source 2 dichroic mirror 3 total reflection mirror 4 LCD light shield 5 Cross dichroic prism mirror 6 Projection lens 7 Photosynthesizer 8, 8-1, 8-2 filter 9,9-1,9-2 Color temperature sensor 10-1, 10-2 drive circuit 11, 11-1, 11-2 Color temperature indicator 12, 12-1, 12-2 Optical sensor 13-1, 13-2 Light intensity display 14, 14-1, 14-2 Adjusting circuit (adjusting means)

Continuation of front page (56) Reference JP-A-5-232428 (JP, A) JP-A-4-11492 (JP, A) JP-A-5-341200 (JP, A) JP-A-1-119193 (JP , A) JP 60-125891 (JP, A) JP 4-255839 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04N 9/31 G02B 5/20

Claims (11)

(57) [Claims] 1. A projection display in which light from a light source having R, G, and B color components is split into three colors, and the split light is projected through a liquid crystal type light-shielding plate through a lens. In the apparatus, the light source is a plurality of light sources, at least one of the light sources is a light source of which color temperature can be adjusted, and a light combiner for combining light from these light sources is provided,
A projection display device, characterized in that light from the photosynthesizer is split. 2. The projection type display device according to claim 1, wherein a filter for reducing light of a predetermined band color is provided to adjust color temperature. 3. The filter according to claim 2, wherein each of the filters is a plurality of filters that reduce light of different band colors,
A projection display device comprising a filter selection mechanism for selecting one of the plurality of filters to reduce light of a predetermined band color. 4. The filter according to claim 2, wherein the filter is a liquid crystal light-shielding plate whose light transmittance is variable by a control signal, and the color temperature is adjusted by changing the light transmittance of the liquid crystal plate. Characteristic projection display device. 5. The projection type display device according to claim 2, wherein the filter is a liquid crystal plate whose color is changed by a control signal, and the color is adjusted by changing the color. 6. The method according to any one of claims 3 to 5,
A color temperature sensor for detecting the color temperature of at least one of the light transmitted through the filter and the light from the photosynthesizer, and adjusting means for adjusting the color temperature of the light transmitted through the filter according to the output of the color temperature sensor. And a projection type display device. 7. The method according to any one of claims 3 to 5,
A color temperature sensor that detects the color temperature of at least one of the light that has passed through the filter and the light from the photosynthesizer, and the adjustment of the color temperature with the filter according to the output of this color temperature sensor and the mounting of the filter And a means for adjusting the light quantity of the light source on the side. 8. The method according to any one of claims 3 to 5,
An optical sensor that detects the amount of light entering the photosynthesizer from the light source and a drive circuit that adjusts the amount of light of the light source according to the output of the optical sensor are provided, and the amount of light of the light source is adjusted and the color temperature is adjusted. A projection display device characterized by the above. 9. The method according to any one of claims 3 to 5,
An optical sensor that detects the amount of light entering each photosynthesizer from each light source, a drive circuit that adjusts the amount of light from the corresponding light source according to the output of this photosensor, and a color temperature that detects the color temperature of the light from the photosynthesizer. A sensor and an adjusting unit that adjusts the color temperature of the filter according to the output of the color temperature sensor are provided, and the light amount of each of the light sources is adjusted, and the color temperature is adjusted based on the output of the color temperature sensor. A projection type display device characterized in that 10. The optical sensor according to claim 3, wherein the light sensor detects the light amount from the light combiner, the drive circuit that adjusts the light amount of each light source according to the output of the light sensor, and the light combiner. A color temperature sensor for detecting the color temperature of the light from the light source, and an adjusting means for adjusting the color temperature of the filter according to the output of the color temperature sensor, and adjusting the light amount of each of the light sources, and the color temperature sensor. A projection type display device characterized in that the color temperature is adjusted based on the output of. 11. A projection display in which light from a light source having three color components of R, G, and B is split into three colors, and the split light is projected through a lens through a liquid crystal light-shielding plate. In the device, the light source is a plurality of light sources, and a light combiner for combining the light from these light sources, and a color for detecting the color temperature of at least one of the light from the light source and the light from the light combiner A projection type display device comprising a temperature sensor and a drive circuit for adjusting the light amount of the light source according to the output of the color temperature sensor, so as to disperse the light from the photosynthesizer.