JP2011180606A - Projection type display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection type display device in which animation characteristic is improved, also pulsation of power consumption is reduced while securing light quantity of projected image, and a power source circuit can be downsized. <P>SOLUTION: The projection type display device has a plurality of light sources 11, 12, 13 which can project color light of colors of which the light sources are different, and the projection type display device includes a light source drive means 35 which controls a lighting time with a time width of less than one frame for each of light sources 11, 12, 13 projecting different colors of light, and light quantity in the lighting time. A light modulation means comprises liquid crystal light valves 21, 22, 23, and the liquid crystal light valves are arranged at a proportion such that one each of liquid crystal light valves 21, 22, 23 is arranged with respect to each of different colors of light respectively, and the light source drive means 35 blink-drives the respective light sources 11, 12, 13 which project different colors of light. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a projection display device that improves moving image characteristics using a solid-state light source such as an LED and reduces consumption peak current.

  Conventionally, it has been known that a display of a type called a hold type in the display image switching method has a poor moving image performance as compared with an impulse type display. Here, the hold-type display is a driving method such as an LCD (Liquid Crystal Display) in which an image is displayed at the same position until the image is switched from one frame to the next. On the other hand, the impulse display is a driving method such as CRT (Cathode Ray Tube) that erases the display of the image before the image is switched.

How the moving image appears on the hold-type display will be described with reference to FIG.
Here, consider a moving image in which a white square WS moves from bottom to top as shown in FIG. The eye continuously tracks the moving image and moves the line of sight E, but the white square WS is displayed at the same position until the frame is switched. Therefore, as shown in FIG. 7B, the white square WS and the line of sight E Deviation G occurs between the two. Then, the frames are switched as shown in FIG. 7C, and the deviation G between the white square WS and the line of sight E is eliminated.

  Due to the deviation G between the white square WS and the line of sight E, the white square WS may appear blurred in the moving direction, and depending on the color display method of the display, the blurred portion may appear colored (for example, non-patent literature). 1).

  In order to overcome the above-described problems, for example, in a direct-view display device using a hold-type display, a backlight that gives display light to the liquid crystal panel from the back is turned on and off within one frame period, thereby causing blurring of an image, etc. Improvement has been achieved (for example, see Patent Document 1).

  In a projection display device using a hold-type display as a light valve, for example, a chopper having a square hole opened around a sufficiently large disk is disposed between a light source and a liquid crystal panel. Is rotated at high speed to prevent image blur by projecting light intermittently within one frame period (see, for example, Patent Document 2).

Tokumao Oma and one other, "Video performance evaluation technology for displays", Liquid Crystal, 2002, Vol. 6, No. 4, p. 359-360

JP 2002-229021 A (Page 3-4, Table 1) JP 2001-296841 A (pages 15-16, FIG. 14 and FIG. 15)

  As described above, in the conventional projection display device, the backlight is turned on and off within one frame period in order to improve moving image characteristics, or the chopper is rotated at high speed to intermittently emit light within one frame period. I was projecting. However, only by intermittently irradiating light with the same luminance, the amount of light per frame is less than that when the light is steadily lit, and the image becomes dark.

  Further, in the method of turning on / off the light, the power consumed by the on / off of the light is greatly increased and decreased and the power consumption pulsates. In order to cope with this, a power supply for supplying power has a problem that the power supply circuit becomes large and the power supply circuit becomes large in size so that the power can be supplied even at the peak of power consumption.

  Further, the method of intermittently projecting light within one frame period by rotating the chopper at high speed has a problem that the light flux that could not pass through the chopper is wasted without being collected and the light utilization efficiency is poor. .

  The present invention has been made in order to solve the above-described problems, and can improve the moving image characteristics and reduce the pulsation of power consumption while ensuring the light quantity of the projected image, thereby reducing the size of the power supply circuit. An object is to provide a mold display device.

  In order to achieve the above object, a projection display apparatus according to the present invention includes a light source, a light modulation unit that modulates light from the light source, and a projection unit that projects light that is modulated by the light modulation unit and combined with an image. The light source is a plurality of light sources capable of emitting color lights of different colors, the lighting time is controlled with a time width of less than one frame for each light source emitting different color lights, and the light is turned on It is characterized by comprising light source driving means for controlling the amount of light in time.

  That is, in the projection type display device of the present invention, the blinking pattern of a plurality of light sources capable of emitting different color lights is controlled by the light source driving means with two parameters of light quantity and lighting time for each light source emitting different color lights. Then, each color light emitted from the light source that is controlled to blink is modulated by the light modulation means to synthesize an image and projected onto a screen or the like by the projection means.

  That is, since the blinking time of the light source is controlled with a time width of less than one frame, the image switching method is close to the impulse type and the moving image characteristics can be improved. In addition, by controlling the light amount at the time of lighting, the light amount reduced by the blinking of the light source can be compensated, and the light amount of the projected image can be secured. Furthermore, by controlling the blinking pattern of the light source for each light source that emits different colored light, it is possible to reduce the pulsation of power consumption due to the blinking of the light source, and to reduce the maximum capacity of the power supply circuit and to reduce the size of the power supply circuit. it can. Further, unlike a projection display device using a conventional chopper, there is almost no light that is not used for image projection in the light emitted from the light source, so that power consumption can be reduced and the power supply circuit can be downsized.

  In the projection display device of the present invention, the plurality of light sources are controlled to blink in a still image mode in which the plurality of light sources are always turned on and in a moving image mode in which the plurality of light sources are controlled to blink in a time width of less than one frame. It is desirable to provide image mode switching means for switching between the two.

  By providing the image mode switching means, the light source is always turned on in the still image mode, and flickering of the image due to blinking of the light source can be suppressed and the pulsation of power consumption can be suppressed. Can be improved.

  In the projection display device of the present invention, the light source driving means determines the light amount emitted from the plurality of light sources as the reciprocal of the light source lighting time ratio in one frame with respect to the maximum light amount that can be emitted during normal lighting (one frame It is desirable to control the amount of light twice the time / lighting time.

  By controlling the amount of light emitted from multiple light sources to the amount of light (one frame time / lighting time) times the maximum light amount that can be emitted during constant lighting, the light amount during lighting is increased even when the lighting time is shortened. be able to. For this reason, the amount of light per frame does not change even when the lamp is lit, so that the amount of light of the projected image can be secured.

  More specifically, in the projection type display device of the present invention, the light source driving means sets the lighting times of the plurality of light sources between about 1/4 to about 3/4 of the time of each frame, and the remaining time is It is desirable to turn off a plurality of light sources.

  Since the maximum value of the lighting times of a plurality of light sources is set to a ratio of about 3/4 of each frame, it is possible to ensure the effect of suppressing the deviation between the movement of the line of sight and the movement of the image, that is, the blur of the image. Movie characteristics can be improved.

In addition, since the minimum value of the lighting times of the plurality of light sources is set to a ratio of approximately 1/4 of each frame, the light amount emitted from the light sources is approximately four times the maximum value during constant lighting.
For this reason, the heat generated instantaneously from the light source is also approximately four times that during constant lighting, and the light source can be prevented from being destroyed by the heat generated instantaneously.

  For example, when the energization time is shorter than about 1/4 times the frame time and the light quantity is larger than about 4 times the maximum value during constant lighting, the amount of generated heat increases, and the light source heats up without time to escape. There is a risk of destruction.

  More specifically, in order to realize the above-described configuration, it is desirable that the light source is a plurality of light emitting diodes (hereinafter abbreviated as LEDs) that can emit different color lights.

  Currently, high-power LEDs are provided for each color light of R, G, and B. Since the LEDs increase in luminance and light quantity almost in proportion to the supplied current, a light source suitable for the projection display device of the present invention is used. Obtainable.

  More specifically, in order to realize the above-described configuration, it is desirable that the light modulation unit is composed of a liquid crystal light valve, and is arranged at a ratio of one liquid crystal light valve for each different color light.

  By arranging one liquid crystal light valve at a ratio of each different color light, it is possible to simultaneously turn on a light source capable of emitting a plurality of different color lights, modulate by the liquid crystal light valve, and synthesize and project it can. Therefore, for example, color breaks are unlikely to occur and the moving image characteristics can be improved.

  In the projection display device of the present invention, all of the light sources that emit different colored lights can be simultaneously blinked by the light source driving means.

By blinking all the light sources emitting different color lights at the same time, all the color lights are modulated, synthesized and projected at the same time, so that the colors are separated and difficult to see on the image.
That is, color breakage hardly occurs and the moving image characteristics can be improved.

  In addition, the light source driving means can blink only the light source emitting one color light among the different color lights emitted from the plurality of light sources, and the remaining light sources can be always turned on. More preferably, the one color light may be green light.

  By blinking the light source that emits the one color light, it is possible to suppress blurring of the image in the moving image display, and it is possible to reduce the pulsation of power consumption by always lighting the light source that emits the other color light, The maximum capacity of the power supply circuit can be suppressed and the power supply circuit can be downsized.

  In human vision, since the spatial resolution of green light is the highest, the effect of suppressing blurring of images in moving image display can be maximized by using green light as the one color light.

Further, the light source driving means can blink the light sources emitting two different color lights among the different color lights emitted from the plurality of light sources, and the remaining light sources can be always lit.
More desirably, the two different color lights can be green light and red light.

  By blinking the light sources that respectively emit the two different color lights, it is possible to further suppress blurring of the image in the moving image display.

  In addition, since human vision has high spatial resolution of green light and red light, the effect of suppressing blurring of images in moving image display can be effectively improved by using green light and red light as the two different color lights. Can do.

  In the projection display apparatus of the present invention, the light source driving means can be driven to blink so that the light sources emitting different color lights sequentially blink by shifting the blink timing for each light source emitting different color lights.

  Since the light sources emitting different color lights sequentially blink, the pulsation of power consumed by the light sources is smoothed, the maximum capacity of the power supply circuit can be suppressed, and the power supply circuit can be miniaturized.

  In the projection display device of the present invention, the light source driving means can be driven to blink by changing the lighting time for each light source emitting different color light, and more preferably, the lighting time of the light source emitting green light Can be driven to blink so as to be longer than the lighting time of the light source emitting other color light.

  Since the brightness and light amount of the LED provided for each color light of R, G, and B differ depending on the color light, the color of the image that is combined and projected by changing the lighting time for each light source that emits different color light and flashing. The balance can be adjusted.

  At present, the luminous efficiency of the LED that emits the G color light is the lowest, so that the lighting time of the light source that emits the G color light is longer than the lighting time of the light source that emits the other color light. It is possible to adjust the color balance of an image to be synthesized and projected by increasing the amount of color light.

It is a schematic block diagram which shows the projection type display apparatus of the 1st Embodiment of this invention. It is a flowchart which shows the image switching of 1st Example of this invention. It is a figure which shows blinking etc. of each LED in 1st Example of this invention. It is a figure which shows blinking etc. of each LED in 2nd Example of this invention. It is a figure which shows blinking etc. of each LED in 3rd Example of this invention. It is a figure which shows blinking etc. of each LED in 4th Example of this invention. It is a conceptual diagram of how a moving image looks on a halt type display.

[First example of the first embodiment]
A first example of the first embodiment of the present invention will be described below with reference to FIGS.
FIG. 1 is a schematic configuration diagram of a projection display device 10 of the present embodiment.
1, reference numerals 11, 12, and 13 are LEDs (light sources), 15 is a condenser lens, 21, 22, and 23 are liquid crystal light valves (light modulation means), 25 is a cross dichroic prism, and 31. Is a projection lens (projection means), and 35 is a light source control section (light source drive means).

  As shown in FIG. 1, the projection display device 10 of the present embodiment is emitted from a plurality of LEDs 11, 12, 13 and LEDs 11, 12, 13 that can emit R, G, and B color lights, respectively. A condenser lens 15 that converts color light into parallel light, liquid crystal light valves 21, 22, and 23 corresponding to R, G, and B, respectively, that modulate parallel light, and a cross dichroic that combines the modulated color lights The prism 25, a projection lens 31 that projects the combined light flux on the screen S, and a light source control unit 35 that performs blinking control of the LEDs 11, 12, and 13 are schematically configured.

  The LEDs 11, 12, and 13 are arranged so as to face each surface of the cross dichroic prism 25 and emit each color light toward the cross dichroic prism 25. The condenser lens 15 is disposed between the LEDs 11, 12, 13 and the cross dichroic prism 25, and the liquid crystal light valves 21, 22, 23 are disposed between the condenser lens 15 and the cross dichroic prism 25.

  The liquid crystal light valves 21, 22, and 23 are composed of a liquid crystal panel, an incident-side polarizing plate, and an emitting-side polarizing plate, and the cross dichroic prism 25 is a dielectric that reflects red light on the inner surface of four rectangular prisms bonded together. The body multilayer film and the dielectric multilayer film that reflects blue light are formed in a cross shape.

  Further, the light source control unit 35 detects whether the image to be projected is a still image or a moving image, and instructs the light source control unit 35 to switch the driving method of the LEDs 11, 12, and 13 to the still image mode or the moving image mode. An image mode switching unit (image mode switching means) 36 is provided.

Next, the operation of the projection display device 10 having the above configuration will be described.
FIG. 2 is a flowchart showing image switching by the image mode switching unit 36 in this embodiment.
As shown in FIG. 1 and FIG. 2A, the image signal displayed on the projection display device 10 is first input to the image mode switching unit 36 (S1), and the image moves due to a difference from the previous image, for example. It is detected whether or not there is (S2), and it is determined whether the displayed image is a still image or a moving image (S3). If the determination result is a still image, a switching signal is output to the light source control unit 35 to drive the LEDs 11, 12, and 13 in the still image mode (always on) (S4). A switching signal is output so as to drive the LEDs 11, 12, and 13 in the moving image mode (flashing drive) (S5).
Alternatively, as shown in FIGS. 1 and 2B, when the user of the projection display device 10 operates a button, a switch, or the like (S10), a still image mode switching signal is output to the light source control unit 35. (S11) or a moving image mode switching signal may be output (S12).

  For example, when the determination result is a still image and a signal for switching to the still image mode is input to the light source control unit 35, the light source control unit 35 causes the LEDs 11, 12, and 13 to pass currents of rated current values and always light up. The R, G, and B color lights emitted from the LEDs 11, 12, and 13 are collimated by the condenser lens 15, modulated by the liquid crystal light valves 21, 22, and 23, respectively, and synthesized by the cross dichroic prism 25. 31 is projected onto the screen S.

FIG. 3 is a diagram showing a blinking pattern of LEDs in the moving image mode in the present embodiment.
In the graph, the horizontal axis of the graph showing the light quantity of each LED is time, and the vertical axis is the relative light quantity when the rated current during normal lighting is passed and the relative light quantity is 1, indicating the power consumption. The horizontal axis of the graph is time, and the vertical axis is the relative power consumption when the power consumption when the rated current during normal lighting is passed is 1.
If the determination result is a moving image, a switching signal to the moving image mode is input to the light source control unit 35. As shown in FIGS. 1 and 3, the light source control unit 35 causes the LEDs 11 and 13 corresponding to R and B to constantly light by flowing a current having the same rated current value as that in the still image mode. On the other hand, when the current corresponding to G is supplied to the LED 12 for only about ½ hour of the time of one frame and the current is supplied by supplying a current that is approximately twice the rated current value during normal lighting. Is driven to blink so as to emit an amount of light that is approximately twice as large as.

Further, as shown in FIG. 3, the power consumed by the LEDs 11, 12, 13 is the sum of the power consumed by the LEDs 11, 13 and the power consumed intermittently by the LEDs 12.
That is, when only the LEDs 11 and 13 are always lit, assuming that the power consumption of all the LEDs in the still image mode is 1, the power consumption of each of the LEDs 11 and 13 is approximately 1/3 times, and thus approximately 2/3. Double power consumption. When the LED 12 is lit there, the power consumption of the LED 12 alone is about twice as much as the rated current value when the LED 12 is always lit, so it is about 2/3 times the power consumption of all LEDs in the still image mode. As a whole, it is about 4/3 times. Accordingly, the pulsation of power consumption is approximately 2/3 times the power consumption of all LEDs in the still image mode.

  According to the above configuration, the LED 12 that emits the color light G is supplied with a current only for approximately ½ hour out of the time of one frame, and is supplied with a current that is approximately twice the rated current value during normal lighting. The amount of light emitted is approximately twice that when flowing. In other words, among the three color lights (R, G, B) that can be perceived by human visual cells, the most sensitive G is turned on for approximately 1/2 hour of the time of one frame, thereby suppressing blurring of the image in the video display. Movie characteristics can be improved. Further, by emitting approximately twice the amount of light when the rated current is passed from the LED 12, it is possible to prevent a decrease in the amount of light in the entire frame.

  In addition, among the LEDs 11, 12, and 13, only the LED 12 is blinked and the LEDs 11 and 13 are always lit, so that the pulsation of the power consumption of the entire LED is only the blinking amount of the LED 12, so the pulsation of the power consumption is not so large. . Therefore, the maximum capacity of the power supply circuit determined by the peak value of power consumption can be suppressed, and the power supply circuit can be reduced in size.

  Further, the amount of heat generated when the LED 12 is turned on is approximately twice that when the rated current is passed, but the lighting time is approximately ½ of one frame, and approximately ½ after that is extinguished. Therefore, the generated heat is diffused and removed from the LED 12 by heat transfer during turning off. Therefore, heat is not accumulated in the LED 12 and the lifetime is not deteriorated.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG.
The basic configuration of the projection display device of the present embodiment is the same as that of the first embodiment, but the blinking patterns of the LEDs 11, 12, and 13 are different. In this embodiment, the LEDs 11 and 12 are used with reference to FIG. , 13 will be described only, and the description of the light source and the like will be omitted.

The operation of the projection display device 10 having the above configuration will be described.
FIG. 4 is a diagram showing a blinking pattern of LEDs in the moving image mode in the present embodiment.
As shown in FIGS. 1 and 4, the light source control unit 35 supplies current to the LEDs 11, 12, and 13 corresponding to R, G, and B for only about 1/3 of the time of one frame and simultaneously, It is driven to blink so as to emit approximately three times the amount of light when the rated current is passed by supplying a current approximately three times the rated current value during constant lighting.

The power consumed by the LEDs 11, 12, and 13 is the sum of the power consumed intermittently by the LEDs 11, 12, and 13.
That is, the power consumption of each of the LEDs 11, 12, and 13 is approximately three times the rated current value, and is approximately one time the power consumption in the still image mode. Since these blink simultaneously, the power consumption during lighting is approximately three times that in the still image mode, and the power consumption during extinguishing is zero. Therefore, the pulsation of the power consumption is approximately three times the power consumption in the still image mode.

  According to the above configuration, the current is supplied to the LEDs 11, 12, and 13 simultaneously for only about 1/3 of the time of one frame, and the current is supplied by approximately three times the rated current value during normal lighting. The amount of light emitted is approximately three times that of the flow. That is, by turning on all the LEDs 11, 12, and 13 simultaneously for approximately 1/3 of the time of one frame, it is possible to effectively suppress blurring of the image in the moving image display, improve the moving image characteristics, and improve the color. Can be prevented from appearing separated. Further, by emitting approximately three times the amount of light when the rated current is passed from the LEDs 11, 12, and 13, it is possible to prevent a decrease in the amount of light in the entire frame.

  Furthermore, the amount of heat generated when the LEDs 11, 12, and 13 are turned on is approximately three times that when the rated current is passed, but the lighting time is approximately 1/3 of one frame, and approximately 2/3 after that. Since the light is turned off, the generated heat is diffused by heat transfer or the like while the light is turned off, and is removed from the LEDs 11, 12, and 13. Therefore, heat is not accumulated in the LEDs 11, 12, and 13, and the lifetime is not deteriorated.

[Third embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG.
The basic configuration of the projection display device of the present embodiment is the same as that of the first embodiment, but the blinking patterns of the LEDs 11, 12, and 13 are different. Therefore, in this embodiment, the LEDs 11 and 12 are used with reference to FIG. , 13 will be described only, and the description of the light source and the like will be omitted.

The operation of the projection display device 10 having the above configuration will be described.
FIG. 5 is a diagram showing a blinking pattern of LEDs in the moving image mode in the present embodiment.
As shown in FIGS. 1 and 5, the light source control unit 35 has only about 1/3 of the time of one frame in the LEDs 11, 12, and 13 corresponding to R, G, and B, and the LEDs 11, 12, and 13 The current is sequentially supplied so that the lighting does not overlap, and the flashing drive is performed so that the current that is three times the rated current value at the time of constant lighting is supplied and the light amount approximately three times that when the rated current is supplied is emitted.

The power consumed by the LEDs 11, 12, 13 is the sum of the power consumed intermittently by the LEDs 11, 12, 13.
That is, the power consumption of each of the LEDs 11, 12, and 13 is approximately three times the rated current value, and is approximately one time the power consumption in the still image mode. Since the LEDs 11, 12 and 13 are sequentially lit, the power consumption in the moving image mode is always about 1 times the power consumption in the still image mode, and the power consumption pulsation is zero.

  According to the above configuration, the currents are supplied in order so that the lighting of the LEDs 11, 12, 13 does not overlap with each other and only for about 1/3 of the time of one frame, and three times the rated current value during normal lighting. The amount of light emitted is approximately three times that of the rated current. That is, by sequentially lighting all the LEDs 11, 12, and 13 for approximately 1/3 of the time of one frame, it is possible to effectively suppress blurring of an image in moving image display and to further improve moving image characteristics.

  In addition, since the LEDs 11, 12, and 13 are blinked sequentially, the power consumption is leveled without pulsation when viewed from the entire power consumption of the LEDs 11, 12, and 13. Therefore, the maximum capacity of the power supply circuit determined by the peak value of power consumption can be suppressed, and the power supply circuit can be reduced in size.

[Fourth embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIG.
The basic configuration of the projection type display device of this embodiment is the same as that of the first embodiment, but the blinking patterns of the LEDs 11, 12, 13 are different. Therefore, in this embodiment, the LEDs 11, 12 are used with reference to FIG. , 13 will be described only, and the description of the light source and the like will be omitted.

The operation of the projection display device 10 having the above configuration will be described.
FIG. 6 is a diagram showing a blinking pattern of LEDs in the moving image mode in the present embodiment.
As shown in FIGS. 1 and 6, the light source control unit 35 allows a current to flow through the LEDs 11 and 13 corresponding to R and B only for approximately ¼ hour of the time of one frame, and the rating at the time of constant lighting. It is driven to blink so as to emit an amount of light that is approximately four times that when a rated current is passed by supplying a current that is approximately four times the current value.
The LED 12 corresponding to G, which has a lower luminous efficiency than the LEDs 11 and 12, passes a current only for approximately ½ hour of the time of one frame, and a current that is approximately four times the rated current value during normal lighting. It is driven to blink so as to emit approximately four times the amount of light when the rated current is supplied.
Further, as shown in FIG. 6, the lighting patterns of the respective LEDs 11, 12, 13 are sequentially turned on so that the LEDs 11, 13 do not overlap, and the LEDs 12 are turned on so as to overlap with the LEDs 11, 13. The

The power consumed by the LEDs 11, 12, 13 is the sum of the power consumed intermittently by the LEDs 11, 12, 13.
That is, the power consumption of each LED 11 and 13 is about 4/3 times the power consumption in the still image mode because a current that is about four times the rated current value flows. The power consumption of the LED 12 is about 4/3 times the power consumption in the still image mode because a current that is about four times the rated current value flows. The peak of power consumption from the lighting pattern of each LED 11, 12, 13 is when the LEDs 11, 12 are lit or when the LEDs 12, 13 are lit, and is approximately 8/3 times the power consumption in the still image mode. . The lowest power consumption is 0 times when all LEDs are turned off.

  According to the above configuration, the LED 11 corresponding to G, which has lower luminous efficiency than the LEDs 11 and 12, passes the same current through the other LEDs 11 and 13 for a longer period of time. It is possible to increase the amount of light and adjust the color balance of the combined and projected image.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the description has been made by adapting to the configuration using the LED as the light source. However, the present invention is not limited to the configuration using the LED, and is applicable to a light source capable of emitting various kinds of color light such as a laser. Is something that can be done.

DESCRIPTION OF SYMBOLS 10 Projection type display apparatus 11, 12, 13 LED (light source) 21, 22, 23 Liquid crystal light valve (light modulation means) 31 Projection lens (projection means) 35 Light source control part (light source drive means) 36 Image mode switching part (image) Mode switching means)

Claims (14)

A projection display device comprising: a light source; a light modulation unit that modulates light from the light source; and a projection unit that projects light that is modulated by the light modulation unit and combined with an image.
The light source is a plurality of light sources capable of emitting colored light of different colors;
A projection-type display apparatus comprising: a light source driving unit that controls a lighting time with a time width of less than one frame for each light source that emits different colored light, and controls a light amount in the lighting time.   Image mode switching means for switching blink control of the plurality of light sources to a still image mode in which the plurality of light sources are always turned on and a moving image mode in which the plurality of light sources are controlled to blink in a time width of less than one frame. The projection display device according to claim 1.   The light source driving means sets the light amount emitted from the plurality of light sources to a light amount that is a reciprocal of the lighting time ratio of the light source in one frame (one frame time / lighting time) with respect to the maximum light amount that can be emitted during normal lighting. 3. The projection type display device according to claim 1, wherein the projection type display device is controlled.   The light source driving means sets a lighting time of the plurality of light sources between about ¼ to about ¾ of a time of each frame, and turns off the plurality of light sources for the remaining time. 3. The projection display device according to 3.   5. The projection display device according to claim 1, wherein the light source is a plurality of light emitting diodes capable of emitting different color lights.   6. The projection type display device according to claim 1, wherein the light modulator comprises a liquid crystal light valve, and is arranged at a ratio of one liquid crystal light valve to different color lights. .   The projection type display device according to claim 1, wherein the light source driving unit causes all of the light sources emitting the different color lights to blink simultaneously.   7. The light source driving unit according to claim 1, wherein the light source driving unit blinks only the light source emitting one color light among the different color lights emitted from the plurality of light sources, and the remaining light sources are always lit. A projection type display device according to claim 1.   The projection display device according to claim 8, wherein the one color light is green light.   7. The light source driving unit according to claim 1, wherein the light source driving unit blinks light sources respectively emitting two different color lights among the different color lights emitted from the plurality of light sources, and the remaining light sources are always lit. Any one of the projection type display apparatuses.   11. The projection type display device according to claim 10, wherein the two different color lights are green light and red light.   7. The light source driving unit according to any one of claims 1 to 6, wherein the light source driving means shifts the flash timing for each light source that emits the different color light, and performs the flash drive so that the light sources that emit the different color light flash sequentially. The projection type display device described in 1.   The projection display device according to claim 1, wherein the light source driving unit is driven to blink by changing a lighting time for each light source emitting the different color light.   14. The projection display device according to claim 13, wherein the light source driving means is driven to blink so that a lighting time of a light source emitting green light is longer than a lighting time of a light source emitting other color light. .

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