JP4186662B2 - Illumination device and projection device - Google Patents

Illumination device and projection device Download PDF

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Publication number
JP4186662B2
JP4186662B2 JP2003076242A JP2003076242A JP4186662B2 JP 4186662 B2 JP4186662 B2 JP 4186662B2 JP 2003076242 A JP2003076242 A JP 2003076242A JP 2003076242 A JP2003076242 A JP 2003076242A JP 4186662 B2 JP4186662 B2 JP 4186662B2
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Prior art keywords
light
illumination
light emitting
liquid crystal
plurality
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JP2003076242A
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Japanese (ja)
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JP2004286858A (en
Inventor
秀也 ▲関▼
秀文 坂田
進 有賀
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セイコーエプソン株式会社
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lighting device for illuminating a liquid crystal element and other spatial light modulation devices, and a projection device that projects an image using the spatial light modulation device and the lighting device.
[0002]
[Prior art]
As a backlight for a liquid crystal display screen, an illuminating device including a light source composed of a plurality of light emitting elements such as an LED array and a light guide plate composed of a transparent acrylic resin or the like has been proposed (see Patent Document 1). In this illuminating device, the emission energy of the light source is adjusted while maintaining the uniformity of the planar light source by controlling the number of lighting such that the LEDs arranged in a matrix are turned off every other row, for example.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-260134
[Problems to be solved by the invention]
However, the lighting device described above does not consider the characteristics of the illumination target, but is dimmed by turning off the light so as not to impair the uniformity. May deteriorate. For example, when trying to illuminate a liquid crystal element or other light valve using the illumination device as described above, it is not possible to prevent the leakage of light conspicuous particularly in the dark part of the projected image, that is, the light-shielding part of the light valve, due to the viewing angle characteristics of the light valve. That is, the phenomenon of so-called “black floating” is likely to occur, and sufficient contrast cannot be obtained.
[0004]
Then, an object of this invention is to provide the illuminating device which can perform exact light control according to the characteristic of the illumination object.
[0005]
It is another object of the present invention to provide a projection apparatus that can accurately reduce light and can project a high-contrast image by incorporating such an illumination apparatus.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, a first illumination device according to the present invention includes a light source having a plurality of light emitting units, an illumination optical system that makes illumination light from the plurality of light emitting units incident on a target, and an illumination that is emitted from the light sources. When adjusting the amount of light, a light amount control means is provided for unevenly increasing or decreasing light intensity of the plurality of light emitting units in accordance with the irradiation response characteristics of the target depending on the incident angle of the illumination light.
[0007]
In the first illuminating device, the light amount control means causes the plurality of light emitting units to be non-uniform in correspondence with the irradiation response characteristic of the target depending on the incident angle of the illumination light when adjusting the light amount of the illumination light emitted from the light source. Therefore, in the type of illumination whose intensity is changed, illumination that makes use of the object according to the characteristics of the object becomes possible. Here, the “target” includes a spatial light modulator represented by a liquid crystal element. In addition, “brightening” typically includes changing from a light-off state to a lighting state, and “dimming” typically includes changing from a lighting state to a light-off state.
[0008]
In a specific aspect of the first illumination device, the angle region in which the light amount control unit deteriorates the irradiation response characteristics of the target among the plurality of light emitting units when the light amount of the total illumination light emitted from the light source is increased or decreased. Priority is given to dimming of the light emitting unit corresponding to the above, or to increasing light of the light emitting unit corresponding to the angle region where the irradiation response characteristic of the target is not degraded. In this case, for example, the illumination response characteristic of the target is not deteriorated even by dimming of the light emitting unit, and therefore, good illumination with good compatibility with the target can be achieved.
[0009]
In the specific aspect of the first lighting device, the light amount control means reduces or reduces the light intensity of the peripheral light emitting portion among the plurality of light emitting portions when the light amount of the total illumination light emitted from the light source is increased or decreased. Priority is given to the brightening of the light emitting part. In this case, the dimming of the peripheral light emitting part and the brightening of the central light emitting part are not alternatives, and the central light emitting part is preferentially brightened and the peripheral light emitting part is This includes the case where it is dimmed with priority. In such an aspect, even if the irradiation response characteristic of the target is likely to deteriorate due to the influence of the illumination light from the peripheral light emitting unit, or even if such deterioration is conspicuous, such deterioration of the irradiation response characteristic. Can be inconspicuous. Also, by dimming from the periphery, the spatial light modulator can be illuminated without waste by a light beam that is relatively parallel to the optical axis from the light emitting part on the center side, thus reducing power consumption during dimming Can do.
[0010]
In another specific aspect of the first illumination device, the illumination optical system is an optical system that superimposes illumination light from a plurality of light emitting units and enters the object, and the light amount control unit includes illumination light for the object. Priority is given to brightening of the light emitting part with a small incident angle or dimming of the light emitting part with a large incident angle of illumination light to the object. In this aspect, even if the irradiation response characteristic of the target is likely to deteriorate due to the influence of the illumination light from the light emitting unit having a large incident angle on the target, or even when such deterioration is conspicuous, such an irradiation response The deterioration of characteristics can be made inconspicuous.
[0011]
The second illumination device according to the present invention adjusts the amount of illumination light emitted from the light source having a plurality of light emitting units, an illumination optical system that makes illumination light from the plurality of light emitting units incident on the target, and the light source. And a light amount control unit that prioritizes the dimming of the peripheral light emitting unit or the brightening of the central light emitting unit among the plurality of light emitting units. In this case, the dimming of the peripheral light emitting part and the brightening of the central light emitting part are not alternatives, and the central light emitting part is preferentially brightened and the peripheral light emitting part is This includes the case where it is dimmed with priority.
[0012]
In the second illuminating device, the light amount control means gives priority to dimming of the peripheral light emitting unit or increasing light of the central light emitting unit among the plurality of light emitting units, so when the amount of light emitted from the light source is small, The spatial light modulator can be illuminated with a light beam relatively parallel to the optical axis from the light emitting part on the center side. That is, since the spatial light modulator can be illuminated with a high illumination light rate when the light emission amount of the light source is small, power consumption can be suppressed particularly during dimming. In addition, even when the irradiation response characteristics of the target are likely to deteriorate due to the influence of the illumination light from the peripheral light emitting section, or even when such deterioration is conspicuous, the deterioration of such irradiation response characteristics is particularly reduced. It can be made inconspicuous at the time of light. In other words, it is possible to achieve good illumination that matches the target and makes use of the target.
[0013]
Moreover, in the specific aspect of the said 1st and 2nd illuminating device, several light emission parts are several chip area | regions arrange | positioned two-dimensionally in the single solid light emission unit. In this case, a solid light emitting unit of a type incorporating a plurality of chips enables good illumination that matches the target and makes use of the target.
[0014]
In another specific aspect of the first and second lighting devices, the plurality of light emitting units are a plurality of solid state light emitting units arranged two-dimensionally. In this case, the plurality of solid-state light emitting units enables good illumination that matches the target and makes use of the target.
[0015]
Moreover, the 1st projection apparatus which concerns on this invention is the projection optical system which projects the image light from the above-mentioned illuminating device, the spatial light modulator illuminated with the illumination light from this illuminating device, and a spatial light modulator. With.
[0016]
In the first projection device, since the spatial light modulation device is illuminated using the above-described illumination device, the illumination intensity can be changed in conformity with the irradiation characteristics of the spatial light modulation device, and the projected image has a luminance. Regardless of, it can be made good.
[0017]
Further, a second projection device according to the present invention includes a plurality of image forming units for each color each having the above-described illumination device and a spatial light modulation device illuminated by illumination light from the illumination device, and a plurality of images. A light combining member that combines and emits image light from the forming unit, and a projection optical system that projects the image light combined through the light combining member.
[0018]
In the second projection device, since each of the spatial light modulation devices is illuminated using the above-described illumination device, the illumination intensity can be changed in accordance with the irradiation characteristics of each spatial light modulation device and projected. A color image or the like can be made favorable regardless of the luminance of the image.
[0019]
In the specific modes of the first and second projection apparatuses, the light amount control means nonuniformly increases or decreases the light emitting units in accordance with the luminance range written in the spatial light modulator. In this case, the luminance of the illumination light can be adjusted appropriately according to the luminance information of the image to be projected.
[0020]
Further, in another specific aspect of the first and second projection apparatuses, when the light amount control means detects the operation of the light amount adjustment switch, the plurality of light emitting units are non-uniformly provided. Fades out. In this case, the amount of illumination light can be adjusted to reflect the user's intention to operate the projection device, the modulation efficiency by the spatial light modulation device is increased, or the use of illumination light used in the optical system of the projection device Efficiency can be increased. That is, if the light amount adjustment switch is, for example, an energy saving mode switch for suppressing power consumption, the contrast of the projected image can be improved even when the light is reduced for energy saving. In addition, if the light is dimmed from the periphery at this time, the spatial light modulator can be efficiently illuminated by the light beam relatively parallel to the optical axis from the light source on the center side, and the image can be efficiently projected onto the screen. As a result, power consumption can be suppressed even when the image brightness during energy saving is the same.
DETAILED DESCRIPTION OF THE INVENTION
[First Embodiment]
FIG. 1 is a block diagram conceptually illustrating the structure of the projection apparatus according to the first embodiment. The projection device, that is, the projector 10 includes an illumination device 20, a light modulation device 30, a projection lens 40, and a control device 50. Here, the illumination device 20 includes an R light illumination device 21, a G light illumination device 23, a B light illumination device 25, and a light source driving device 27. The light modulation device 30 outputs drive signals to the three liquid crystal light valves 31, 33, and 35 that are spatial light modulation devices, the cross dichroic prism 37 that is a light combining member, and the liquid crystal light valves 31, 33, and 35. And an element driving device 38. The R light illumination device 21 and the liquid crystal light valve 31 are collectively called an image forming unit. Similarly, the units of the G light illumination device 23 and the liquid crystal light valve 33 and the units of the B light illumination device 25 and the liquid crystal light valve 35 are also referred to as image forming units.
[0021]
FIG. 2 is a diagram illustrating the structure of the R light illumination device 21 in the illumination device 20. The R light illumination device 21 includes a light source 21a that generates R light included in the red (R) category of the three primary colors, a convex lens 21c that collects illumination light emitted from the light source 21a in the front direction, And a concave reflecting mirror 21d that condenses the illumination light emitted from the light source 21a to the side. Among these, the convex lens 21c and the concave reflecting mirror 21d constitute an illumination optical system. The light source 21a constitutes a solid light emitting unit.
[0022]
Here, the light source 21a is an LED package also called a solid light source, and as shown in the front structural view of FIG. 3, a plurality of light emitting units, that is, chip regions, are arranged in nine matrix diode chips PC11 and PC12. , PC13, PC21, PC22, PC23, PC31, PC32, and PC33. These diode chips PC11 to PC33 are individually driven by the light source driving device 27 of FIG. 1, and any diode chip can be individually turned on or off.
[0023]
Returning to FIG. 2, among the diode chips PC21, PC22, and PC23 constituting the light source 21a, the light beam L22 emitted while diverging in the front direction from the central diode chip PC22 on the optical axis is a lens portion of the light source 21a. The light is converted into a substantially parallel light beam by the LP and the convex lens 21c, and enters the liquid crystal light valve 31 for R light substantially perpendicularly. Note that the light beam L22 ′ emitted from the diode chip PC22 while diverging in the lateral direction is also converted into a substantially parallel light beam by the concave reflecting mirror 21d and is incident on the liquid crystal light valve 31 almost vertically. As a result, the liquid crystal light valve 31 is illuminated uniformly and efficiently by the diode chip PC22. Similarly, the light beam L12 emitted from the diode chip PC12 on the peripheral side deviated upward from the optical axis is also converted into a substantially parallel light beam by the lens portion LP and the convex lens 21c, or converted into a substantially parallel light beam by the concave reflecting mirror 21d. And enters the liquid crystal light valve 31. As a result, the liquid crystal light valve 31 is uniformly and efficiently illuminated also by the diode chip PC12. However, the incident angle of the light beam L12 incident on the liquid crystal light valve 31 from the diode chip PC12 is not perpendicular to the incident surface of the liquid crystal light valve 31, but is a fixed angle (for example, several degrees to several tens degrees) inclined upward. It is a certain angle range with the center. Further, the light beam L32 emitted from the peripheral diode chip PC32 which is off from the optical axis is also converted into a substantially parallel light beam by the lens portion LP and the convex lens 21c, or is converted into a substantially parallel light beam by the concave reflecting mirror 21d. Is incident on the liquid crystal light valve 31. As a result, the liquid crystal light valve 31 is uniformly and efficiently illuminated by the diode chip PC32. However, the incident angle of the light beam L32 incident on the liquid crystal light valve 31 from the diode chip PC32 is not perpendicular to the incident surface of the liquid crystal light valve 31, but is a certain angle inclined downward (for example, several degrees to several tens degrees). It has become.
[0024]
In the above, only the structure of the R light illuminating device 21 in the illuminating device 20 of FIG. 1 has been described, but the specifications of the dimensions and the like of the G light illuminating device 23 and the B light illuminating device 25 are also slightly changed according to the emission wavelength. It has the same structure as the R light illuminating device 21.
[0025]
In other words, the G light liquid crystal light valve 33 is uniformly and efficiently illuminated by the G light from the G light illuminating device 23, but the LED package which is a light source provided in the G light illuminating device 23 is a matrix array diode. Since the chip is built in, the incident angle of the light beam incident on the liquid crystal light valve 33 from the peripheral diode chip is not perpendicular to the incident surface of the liquid crystal light valve 33 but is a constant angle inclined in the corresponding direction. (For example, several degrees to several tens degrees). Further, the B light liquid crystal light valve 35 is uniformly and efficiently illuminated by the B light from the B light illuminating device 25. The LED package which is a light source provided in the B light illuminating device 25 is also a matrix array diode. Since the chip is built in, the incident angle of the light beam incident on the liquid crystal light valve 35 from the peripheral diode chip is not perpendicular to the incident surface of the liquid crystal light valve 35, but is a constant angle inclined in the corresponding direction. (For example, several degrees to several tens degrees).
[0026]
Light from each of the illuminating devices 21, 23, 25 incident on the liquid crystal light valves 31, 33, 35 is two-dimensionally modulated by the liquid crystal light valves 31, 33, 35, respectively. The light of each color that has passed through the liquid crystal light valves 31, 33, and 35 is combined by a cross dichroic prism 37 that is a light combining member and is emitted from one side surface. The combined light image emitted from the cross dichroic prism 37 enters the projection lens 40 that is a projection optical system and is projected at a suitable magnification on a screen (not shown) provided outside the projector 10. That is, an image obtained by combining the images of the respective colors R, G, and B formed on the respective liquid crystal light valves 31, 33, and 35 that operate according to the drive signal from the element driving device 38 by the projector 10 is a moving image or a still image. As projected on the screen. Although not shown in the figure, a pair of polarized light beams are provided at appropriate positions around the liquid crystal light valves 31, 33, 35 in order to illuminate and read the liquid crystal light valves 31, 33, 35 with polarized light. A board is placed.
[0027]
The control device 50 is composed of a microcomputer or the like, and outputs control signals to the light source driving device 27 and the element driving device 38 to operate the light illumination devices 21, 23, 25 and liquid crystal light valves 31, 33, 35 of the respective colors. Is controlled indirectly. More specifically, the control device 50 determines the intensity of illumination light emitted from the illumination devices 21, 23, 25 according to an image signal input from the outside, which is strong, medium, or weak 3 via the light source driving device 27. Adjust in stages. Further, the control device 50 synchronizes with the lighting state of the lighting devices 21, 23, 25 of each color in accordance with the image signal from the outside, while operating the liquid crystal light valves 31, 33, 35, that is, two-dimensional. The light modulation state is controlled to correspond to the input image signal.
[0028]
At this time, the control device 50 also checks the state of the light amount adjustment switch 51. The light amount adjustment switch 51 is for operating the projector 10 by switching between the normal mode and the energy saving mode. When it is determined that the light amount adjustment switch 51 is set to the normal mode, the control device 50 adjusts the intensity of the illumination light emitted from the illumination devices 21, 23, and 25 for each color in three levels of strong, medium, and weak. On the other hand, when the control device 50 determines that the light amount adjustment switch 51 is set to the energy saving mode 51, the control device 50 adjusts the intensity of the illumination light emitted from the illumination devices 21, 23, and 25 of each color in two levels, medium and weak. When the projector 10 is operated in the energy saving mode, the projector 10 can be operated in a more environmentally friendly and economical state.
[0029]
Here, when adjusting the intensity of the illumination light emitted from the illumination devices 21, 23, 25, it becomes a problem which one of the diode chips PC11 to PC33 has priority to be turned on or off. At this time, if the light is dimmed by gradually turning off from the peripheral side instead of turning off the diode chips PC11 to PC33, the use efficiency of the illumination light in the entire optical system of the projection device and the spatial light modulation device This is advantageous in terms of modulation efficiency. That is, if the light is reduced from the periphery, after the light is reduced, the liquid crystal light valves 31, 33, and 35 are illuminated without waste by a light beam relatively parallel to the optical axis from the light emitting portion on the center side, that is, the diode chip PC22. An image can be efficiently projected onto a screen. When the light emitting part is the diode chip PC11 to PC33, a light beam having a certain spread around the axis of each chip is emitted, so that it is emitted from the peripheral part of the light source 21a (for example, the diode chip PC11). The illumination light may be partially blocked by the subsequent light modulation device 30, the projection lens 40, etc., and may not be used efficiently. When the use of illumination light from the peripheral light emitting unit is wasteful as described above, the loss of light quantity at the time of dimming can be reduced by giving priority to the light reduction of the peripheral light emitting unit, that is, the diode chip PC11. This means that, particularly in the energy saving mode, even if the brightness of the projected image is the same, the power consumption can be suppressed by the turn-off sequence. Conversely, the projected image can be brightened even if the power consumption is the same. means. Further, if the intensity of the illumination light is reduced from the periphery, the liquid crystal light valves 31, 33, and 35 are caused by the light flux that is relatively parallel to the optical axis from the light emitting portion remaining on the center side, that is, the diode chip PC22. It will be illuminated. The modulation efficiency of the liquid crystal light valves 31, 33, and 35 is generally best at normal incidence parallel to the optical axis, and deteriorates as the incident angle increases. Such a decrease in image quality can be easily prevented.
[0030]
FIG. 4 is a graph illustrating the viewing angle characteristics of the liquid crystal light valves 31, 33, and 35 in FIG. In the graph, the surrounding angle value indicates the orientation on the main surface of the liquid crystal light valve, that is, the incident surface of the illumination light, and the increasing angle value from the center toward the periphery indicates the illumination light to the main surface of the liquid crystal light valve. Indicates the incident angle. This liquid crystal light valve is a type of display device that operates in the TN mode, that is, the TN mode. When illumination light from a direction perpendicular to the main surface of the liquid crystal light valve (incident angle 0 °) is incident, efficient modulation is performed. When the pixel is in a black display state, the illumination light is transmitted. Is almost completely blocked. On the other hand, when illumination light with a relatively large incident angle is incident on the main surface of such a liquid crystal light valve, the modulation efficiency decreases, and in particular, about 0 °, 90 °, 180 °, along the four sides of the liquid crystal light valve. Even when the illumination light from the 270 ° azimuth is excluded and the pixel is in a black display state, a relatively large leakage of the illumination light occurs and a phenomenon occurs in which black floats.
[0031]
From this, it can be seen that it is desirable to use vertically incident illumination light when illuminating a TN mode liquid crystal light valve. Furthermore, when increasing the illumination intensity of the TN mode liquid crystal light valve, it is desirable to give priority to increasing the amount of vertically incident illumination light. On the other hand, when reducing the illumination intensity of the TN mode liquid crystal light valve, it can be seen that priority is given to reducing the amount of obliquely incident illumination light. From this point of view, in the present embodiment, for example, in the dimming by the R light source 21a shown in FIG. 3, the center side diode chip PC22 is preferentially turned on, and the peripheral side diode chips PC11, PC12 are turned on. , PC13, PC21, PC23, PC31, PC32, and PC33 are preferentially erased. Moreover, since the viewing angle characteristics of illumination light from directions of directions of about 0 °, 90 °, 180 °, and 270 ° are relatively good, directions from directions of directions of about 0 °, 90 °, 180 °, and 270 ° are used. Priority is given to increasing the amount of illumination light, and priority is given to decreasing the amount of illumination light from directions of about 45 °, 135 °, 225 °, and 315 °.
[0032]
FIG. 5 is a diagram for explaining the blinking order of the diode chips PC11 to PC33 constituting the light source 21a. 5A shows a case where the light source 21a emits light with the maximum intensity, FIG. 5B shows a case where the light source 21a emits light with an intermediate intensity, and FIG. 5C shows the light source 21a. Is shown when light is emitted at the minimum intensity. In the case of FIG. 5A, all the diode chips PC11 to PC33 are turned on. In the case of FIG. 5B, five diode chips PC12, PC21, PC22, PC23, and PC32 are lit in a cross shape. Further, in the case of FIG. 5C, only the central diode chip PC22 is lit.
[0033]
More specifically, when increasing the intensity of illumination light emitted from the light source 21a, the state shown in FIG. 5C is changed to the state shown in FIG. 5B, and then the state shown in FIG. The state (a) is assumed. That is, the diode chip PC22 is turned on first, the diode chips PC12, PC21, PC23, and PC32 on the side are turned on, and finally the diagonal diode chips PC11, PC13, PC31, and PC33 are turned on. . Conversely, when reducing the intensity of the illumination light emitted from the light source 21a, the state shown in FIG. 5A is changed to the state shown in FIG. 5B, and then the state shown in FIG. 5B is changed to the state shown in FIG. And That is, all the diode chips PC11 to PC33 are turned on in advance, then the diagonal diode chips PC11, PC13, PC31, and PC33 are turned off, and finally the side-side diode chips PC12, PC21, PC23, and PC32 are turned on. It will be consumed.
[0034]
Although the above has described the light amount adjustment for the R light, the light amount adjustment is similarly performed for the G light and the B light. That is, on the basis of the three-stage lighting state shown in FIGS. 5A to 5C, when the G light or B light is increased, it is turned on from the center side, and when it is reduced, the peripheral side is turned on. It fades out from.
[0035]
FIG. 6 is a flowchart for mainly explaining the operation of the control device 50 of FIG. First, the control device 50 reads the luminance information of the image from the captured image signal (step S1). Next, the state of the light quantity adjustment switch 51, which is an energy saving switch, is checked (step S2). When the energy saving mode 51 is not selected by the light amount adjustment switch 51, the illumination is performed in the normal mode. In this case, the control device 50 determines whether the input image has high, medium, or low luminance from the read luminance information (step S3). When the input image signal indicates a high-luminance image, the control device 50 sets the illumination light emitted from the illumination devices 21, 23, and 25 of each color to the maximum “strong” state (step S4). Specifically, the light sources of the respective colors are turned on in the state shown in FIG. 5A, and all the diode chips PC11 to PC33 are turned on. When the input image signal indicates a medium luminance image, the control device 50 sets the illumination light emitted from the illumination devices 21, 23, and 25 of each color to an intermediate “medium” state (step S5). Specifically, each color light source is turned on in the state shown in FIG. 5B, and the diode chips PC12, PC21, PC22, PC23, and PC32 on the center side are turned on. When the input image signal indicates a low-luminance image, the control device 50 sets the illumination light emitted from the illumination devices 21, 23, and 25 of each color to the lowest “weak” state (step S6). Specifically, the light sources of the respective colors are turned on in the state shown in FIG. 5C, and only the central diode chip PC22 is turned on. Thereafter, the control device 50 determines whether or not the next image signal, that is, the next frame signal has been read (step S10). If the next image signal is not captured, it means the end of the image display, and the process is terminated. However, if the next image signal is captured, the process returns to step S1 and the processes up to step S10 are repeated for each color. Maintain or increase or decrease the lighting status of.
[0036]
In the above normal mode operation, the control device 50 adjusts the light modulation states of the liquid crystal light valves 31, 33, and 35 via the element driving device 38. That is, the light modulation state is adjusted so that the amount of light passing through each pixel portion of each liquid crystal light valve 31, 33, 35 matches the luminance distribution of the input image. At this time, the light modulation state of each of the liquid crystal light valves 31, 33, 35 is changed depending on whether the input image has high, medium, or low luminance. For example, in the case of an image with medium to low luminance, the illumination light is dimmed, so that the range of the amount of light modulation by each of the liquid crystal light valves 31, 33, 35 is widened so as to compensate for the dimming amount.
[0037]
When it is determined in step S2 that the energy saving mode is selected, illumination in the energy saving mode is performed. In this case, the control device 50 determines whether the input image has high or low luminance from the read luminance information (step S7). When the input image signal indicates a high luminance image (high luminance), the control device 50 sets the illumination light emitted from the illumination devices 21, 23, and 25 of each color to an intermediate “medium” state (step S8). Specifically, the light source of each color is turned on in the state shown in FIG. When the input image signal indicates a low-luminance image (low luminance), the control device 50 sets the illumination light emitted from the illumination devices 21, 23, and 25 of each color to the lowest “weak” state (step S9). Specifically, the light source of each color is turned on in the state shown in FIG. Thereafter, the process returns to step S1 through step S10.
[0038]
Also in the above energy saving mode operation, the control device 50 adjusts the light modulation states of the liquid crystal light valves 31, 33, and 35 via the element driving device 38. That is, the light modulation state is adjusted so that the amount of light passing through each pixel portion of each liquid crystal light valve 31, 33, 35 matches the luminance distribution of the input image. At this time, the light modulation state of each of the liquid crystal light valves 31, 33, 35 is changed depending on whether the input image has high or low luminance. Specifically, in the case of a low-luminance image, the illumination light is dimmed, so that the range of light modulation amounts by the liquid crystal light valves 31, 33, 35 is widened so as to compensate for the dimming amount.
[0039]
Here, in order to determine the luminance level of the image from the image signal, for example, the following may be performed. The control device 50 integrates the luminance values of each pixel represented by the image signal, and obtains an average value of the luminance values for each frame. At the same time, the control device 50 writes the input image signal in a frame memory (not shown). Here, the frame memory is a buffer that stores an image signal for one frame.
[0040]
The control device 50 determines whether the average value calculated for each frame is in a low luminance range, a medium luminance range, or a high luminance range, so that the image of the frame is a low luminance image or a medium luminance. Determine whether the image is a high brightness image. After this determination, the control device 50 reads out an image signal corresponding to the frame from the frame memory and supplies it to the spatial light modulator (liquid crystal light valves 31, 33, 35). At the same time, the illuminators 21, 23, 25 are controlled so that the spatial light modulators (liquid crystal light valves 31, 33, 35) are illuminated with the light intensity corresponding to the average luminance of the frame. Note that the luminance value may be calculated by, for example, (R + G + B) / 3 when the input video signal is represented by an R signal, a G signal, and a B signal. Here, R, G, and B indicate values represented by the R signal, the G signal, and the B signal, respectively.
[0041]
In the above description, each RGB color is illuminated at the same intensity level, but the intensity level of the illumination light can be changed for each RGB color. In this case, for example, in a specific image, the liquid crystal light valve 31 for R light is illuminated at a “high” level, and the liquid crystal light valves 33 and 35 for G and B light are illuminated at a “medium” level. It will be. Thereby, the image which emphasized the specific color can be projected.
[0042]
As is clear from the above description, in the projector 10 of the present embodiment, the control device 50 that is a light amount control unit emits illumination light from each of the illumination devices 21, 23, 25 according to the luminance of the image to be projected. Adjust the amount of light. At this time, the diode chips PC11 to PC33, which are the light emitting portions, are turned on or off non-uniformly corresponding to the irradiation response characteristics of the liquid crystal light valves 31, 33, 35 depending on the incident angle of the illumination light, that is, the viewing angle characteristics. . Thereby, illumination that makes use of the characteristics of the liquid crystal light valves 31, 33, 35 according to the characteristics of the liquid crystal light valves 31, 33, 35 becomes possible.
[0043]
[Second Embodiment]
Hereinafter, the projector according to the second embodiment will be described. This projector is a partial modification of the projector according to the first embodiment, and the overall apparatus configuration is the same as that shown in FIG.
[0044]
FIG. 7 is a graph illustrating the viewing angle characteristics of the liquid crystal light valve incorporated in the projector according to the second embodiment. The liquid crystal light valve is a type of display device that operates in a vertical alignment mode, that is, a vertical alignment mode. When illumination light from a direction perpendicular to the main surface (incidence angle 0 °) is incident on such a liquid crystal light valve, efficient modulation is performed as in the first embodiment shown in FIG. When the pixel is in a black display state, the transmission of illumination light is almost completely blocked. On the other hand, when illumination light having a relatively large incident angle is incident on the main surface of such a liquid crystal light valve, the modulation efficiency decreases, and in particular, the diagonal directions of the liquid crystal light valve are about 45 °, 135 °, 225 °, Even when the illumination light from the 315 ° azimuth is removed and the pixel is in a black display state, a relatively large leakage of the illumination light occurs, resulting in a phenomenon that black floats.
[0045]
From this, it can be seen that when increasing the illumination intensity of the liquid crystal light valve in the vertical alignment mode, it is desirable to give priority to increasing the amount of illumination light with normal incidence. On the other hand, when reducing the illumination intensity of the liquid crystal light valve in the vertical alignment mode, it can be seen that priority is given to reducing the amount of obliquely incident illumination light.
[0046]
FIG. 8 is a diagram illustrating the blinking order of each diode chip provided in the light source in the second embodiment. FIG. 8A shows a case where the light source 21a emits light at the maximum intensity, FIG. 8B shows a case where the light source 21a emits light at an intermediate intensity, and FIG. 8C shows the light source 21a. Is shown when light is emitted at the minimum intensity. Here, in the case of FIG. 8A, all the diode chips PC11 to PC33 are turned on. Further, in the case of FIG. 8B, five diode chips PC11, PC13, PC22, PC31, and PC33 are lit in an X shape. Further, in the case of FIG. 8C, only the central diode chip PC22 is turned on.
[0047]
When the intensity of the illumination light emitted from the light source 21a is increased, the state shown in FIG. 8C is changed from the state shown in FIG. 8C to the state shown in FIG. 8B. Conversely, when the intensity of the illumination light emitted from the light source 21a is reduced, the state shown in FIG. 8A is changed to the state shown in FIG. 8C from the state shown in FIG. 8B. In the energy saving mode, the intensity of the illumination light is switched between the two states shown in FIGS. 8B and 8C.
[0048]
The above is the description of the light amount adjustment for the illumination light of the color R, but the light amount adjustment is similarly performed for the illumination light of the color G and the color B.
[0049]
[Third Embodiment]
The projector according to the third embodiment is also a partial modification of the projector according to the first embodiment, and the overall apparatus configuration is the same as that shown in FIG.
[0050]
FIG. 9 is a front view illustrating the structure of the light source of the illumination device incorporated in the projector according to the third embodiment. The light source 221a in this case includes diode chips PC11 to PC44 arranged in a matrix of 16 as a plurality of light emitting units. These diode chips PC11 to PC44 are individually driven by the light source driving device 27 shown in FIG.
[0051]
FIG. 10 is a diagram illustrating the blinking order of each diode chip provided in the light source in the third embodiment. 10A shows a case where the light source 221a emits light with the maximum intensity, FIG. 10B shows a case where the light source 221a emits light with an intermediate intensity, and FIG. 10C shows the light source 221a. Is shown when light is emitted at the minimum intensity. Here, in the case of FIG. 10A, all the diode chips PC11 to PC44 are turned on. In the case of FIG. 10B, twelve diode chips PC12, PC13, PC21 to PC24, PC31 to PC34, PC42, and PC43 are lit in a cross shape. Further, in the case of FIG. 10C, the central diode chips PC22, PC23, PC32, and PC33 are turned on.
[0052]
When increasing the intensity of the illumination light emitted from the light source 221a, the state shown in FIG. 10C is changed from the state shown in FIG. 10C to the state shown in FIG. Conversely, when reducing the intensity of illumination light emitted from the light source 221a, the state shown in FIG. 10A is changed to the state shown in FIG. 10C from the state shown in FIG. 10B. In the energy saving mode, the intensity of the illumination light is switched between the two states shown in FIGS. 10B and 10C.
[0053]
The above is the description of the light amount adjustment for the illumination light of the color R, but the light amount adjustment is similarly performed for the illumination light of the color G and the color B.
[0054]
[Fourth Embodiment]
The projector according to the fourth embodiment is a partial modification of the projector according to the first and second embodiments, and the overall apparatus configuration is the same as that shown in FIG.
[0055]
FIG. 11 is a diagram illustrating the structure of an R light illuminating device 321 in which the R light illuminating device 21 of FIG. 1 is changed. The R light illuminating device 321 collects the light source 21a that generates R light, the convex lens 21c that condenses the illumination light emitted from the light source 21a in the front direction, and the illumination light emitted from the light source 21a to the side. A concave reflecting mirror 21d that shines, and a rod integrator 321f that superimposes and illuminates the illumination light collected by the convex lens 21c and the concave reflecting mirror 21d by wavefront division.
[0056]
Here, since the light source 21a, the convex lens 21c, and the concave reflecting mirror 21d are the same as those in the first embodiment, description thereof is omitted. In the R light illuminating device 321, the incident end surface EF1 of the rod integrator 321f is arranged at the condensing position by the convex lens 21c and the concave reflecting mirror 21d, not the incident surface of the liquid crystal light valve 31. As a result, the incident end face EF1 is uniformly and efficiently illuminated by the diode chips PC21, PC22, and PC23. The illumination light that has entered the rod integrator 321f from the incident end face EF1 goes straight through the rod integrator 321f, or is reflected from the side face one or more times and exits from the exit end face EF2. The illumination light emitted from the emission end face EF2 is mixed and further uniformed by the rod integrator 321f, and more uniformly illuminates the liquid crystal light valve 31 disposed facing the emission end face EF2. At this time, since the incident angle distribution of the illumination light incident on the liquid crystal light valve 31 is maintained even after passing through the rod integrator 321f, FIG. 5 (a) to FIG. 5 (c) and FIG. 8 (a) to FIG. The luminance of the light source 21a is switched in the blinking order shown in c).
[0057]
The above is the explanation of the illumination light of the color R, but illumination and light amount adjustment are also performed for the illumination light of the color G and the color B by the same optical system.
[0058]
[Fifth Embodiment]
The projector according to the fifth embodiment is a partial modification of the projector according to the first to fourth embodiments, and the overall apparatus configuration is the same as that shown in FIG.
[0059]
FIG. 12 is a diagram illustrating the structure of an R light illuminating device 421 in which the R light illuminating device 21 of FIG. 1 is changed. The R light illumination device 421 includes an LED package 421a that is a plurality of light emitting units that generate R light, a convex lens 421c that is arranged to face each LED package 421a and collimates illumination light emitted in the front direction, and each And a superimposing lens 421h that superimposes the illumination light collimated by the convex lens 21c by condensing the illumination light.
[0060]
Here, the focal length of the combining optical system constituted by the convex lens 21c and the lens portion LP of the LED package 421a is f1, and the focal length of the superimposing lens 421h is f2. The liquid crystal light valve 31 is disposed at the position of the rear focus of the superimposing lens 421h. As a result, the illumination light L emitted from each LED package 421a enters the liquid crystal light valve 31 in a superimposed manner, so that the liquid crystal light valve 31 is illuminated uniformly.
[0061]
FIG. 13 is a diagram illustrating the arrangement of the LED packages 421a. Each LED package 421a is arranged in a matrix of nine elements, and constitutes a light source for R light as a whole. Each LED package 421a consists only of a single diode chip PC. These LED packages 421a are individually driven by the light source driving device 27 of FIG. 1, and any LED package 421a can be individually turned on or off.
[0062]
FIG. 14 is a diagram illustrating the blinking order of the LED packages 421a in the light source according to the fifth embodiment. FIG. 14A shows a case where the LED package 421a emits light with the maximum intensity, FIG. 14B shows a case where the LED package 421a emits light with an intermediate intensity, and FIG. The case where the LED package 421a emits light with the minimum intensity is shown. The extinguished LED package 421a is indicated by a dotted line. Here, in the case of FIG. 14A, all LED packages 421a are turned on. Moreover, in the case of FIG.14 (b), the five LED packages 421a are lit by X shape. Further, in the case of FIG. 14C, only the central LED package 421a is turned on. In the projector having the configuration of the first embodiment, when the LED package 421a emits light with an intermediate intensity, the five LED packages 421 may be lit in a + shape.
[0063]
When the intensity of illumination light emitted from the light source shown in FIG. 13 is increased, the state shown in FIG. 14C is changed from the state shown in FIG. 14C to the state shown in FIG. Conversely, when reducing the intensity of the illumination light emitted from the light source, the state of FIG. 14A is changed to the state of FIG. 14C through the state of FIG. 14B. In the energy saving mode, the intensity of the illumination light is switched between the two states shown in FIGS. 14 (b) and 14 (c).
[0064]
The above is the explanation of the illumination light of the color R, but illumination and light amount adjustment are also performed for the illumination light of the color G and the color B by the same optical system.
[0065]
[Sixth Embodiment]
The projector according to the sixth embodiment is obtained by partially changing the operation of the projector according to the first to fifth embodiments, and the overall apparatus configuration is the same as that shown in FIG.
[0066]
In the projector according to the sixth embodiment, when the energy saving mode is set by the light amount adjustment switch 51, the intensity of the illumination light emitted from the illumination devices 21, 23, 25 for each light is set to a specific state regardless of the luminance of the image signal. To lower. In other words, in the energy saving mode of the present embodiment, regardless of the brightness of the image, the user, that is, the viewer, forcibly turns off the peripheral light-emitting part, leaving the central light-emitting part, that is, the diode chip PC22, etc. Darken the image. Specifically, in the present embodiment, the step of determining the luminance of the image signal (step S7) in the flowchart shown in FIG. 6 is omitted, and the process immediately proceeds to step S8 or step S9 to perform predetermined dimming. In this case, the range of the amount of light modulation by the liquid crystal light valves 31, 33, and 35 is set to a normal range according to the image signal.
[0067]
Although the present invention has been described based on the above embodiments, the present invention is not limited to the above embodiments. For example, in the projector 10 according to the first embodiment, the light modulation device 30 is configured by the transmissive liquid crystal light valves 31, 33, and 35, but may be configured by a reflective liquid crystal element. Further, the liquid crystal light valve can be a light writing type liquid crystal light valve.
[0068]
Moreover, in the said embodiment, although the light source is comprised using LED, it replaced with LED and other solid light sources, such as EL light emitting element and LD, can also be used. Furthermore, an illumination device or a projector including the same light source as that in the above embodiment can also be realized by using a plurality of other types of discrete light emitting sources as the light emitting unit.
[Brief description of the drawings]
FIG. 1 is a diagram showing a structure of a projector according to a first embodiment.
FIG. 2 is a diagram illustrating the structure of a light illumination device in the device of FIG.
FIG. 3 is a front structural view of the LED package in FIG. 2;
FIG. 4 is a graph illustrating viewing angle characteristics of a liquid crystal light valve.
FIGS. 5A to 5C are diagrams illustrating a blinking order of light emitting units.
FIG. 6 is a diagram for explaining the operation of the projector according to the first embodiment.
FIG. 7 is a graph for explaining viewing angle characteristics of another liquid crystal light valve.
FIGS. 8A to 8C are diagrams illustrating light control according to the second embodiment.
FIG. 9 is a diagram illustrating a light source according to a third embodiment.
FIGS. 10A to 10C are diagrams illustrating a blinking order.
FIG. 11 is a diagram illustrating a lighting device according to a fourth embodiment.
FIG. 12 is a diagram illustrating a lighting device according to a fifth embodiment.
13 is an array diagram of the LED package in FIG. 12. FIG.
FIGS. 14A to 14C are diagrams illustrating the blinking order.
[Explanation of symbols]
10 Projector
20 Lighting device
21 R light illumination device
21a Light source
23 G light illumination device
25 B lighting device
27 Light source driving device
30 Light modulator
31, 33, 35 Liquid crystal light valve
37 Cross Dichroic Prism
38 element drive
40 projection lens
50 Control device
51 Light control switch
321f Rod integrator
421h Superimposing lens

Claims (10)

  1. A light source having a plurality of light emitting portions;
    An illumination optical system for causing illumination light from the plurality of light emitting units to enter the liquid crystal light valve ;
    When adjusting the amount of illumination light emitted from the light source, the plurality of light emitting portions are non-uniformly brightened or dimmed according to the irradiation response characteristics of the liquid crystal light valve depending on the incident angle of the illumination light. Light quantity control means ,
    The light amount control means includes a light emitting unit corresponding to an angle region that deteriorates an irradiation response characteristic of the liquid crystal light valve among the plurality of light emitting units when increasing or decreasing the light amount of all illumination light emitted from the light source. A lighting device characterized in that priority is given to dimming or brightening of a light emitting unit corresponding to an angular region in which the irradiation response characteristics of the liquid crystal light valve are not degraded .
  2.   The light amount control means prioritizes dimming of a peripheral light emitting unit or increasing light of a central light emitting unit among the plurality of light emitting units when increasing or decreasing the light amount of all illumination light emitted from the light source. The lighting device according to claim 1.
  3. The illumination optical system is an optical system that superimposes illumination light from the plurality of light emitting units and enters the liquid crystal light valve , and the light amount control unit has a small incident angle of the illumination light to the liquid crystal light valve . 2. The lighting device according to claim 1, wherein priority is given to light increase of the light emitting part or light reduction of the light emitting part having a large incident angle of illumination light to the liquid crystal light valve .
  4. A light source having a plurality of light emitting portions;
    An illumination optical system for causing illumination light from the plurality of light emitting units to enter the liquid crystal light valve ;
    When adjusting the amount of illumination light emitted from the light source, comprising a light amount control means for giving priority to dimming of the light emitting portion on the peripheral side among the plurality of light emitting portions, or light increase of the light emitting portion on the center side ,
    The light amount control means, when increasing or decreasing the light amount of the total illumination light emitted from the light source, the light emitting unit corresponding to the angle region that deteriorates the irradiation response characteristic of the liquid crystal light valve among the peripheral light emitting units The lighting device is characterized in that priority is given to dimming of light, or to increasing light of a light emitting unit corresponding to an angle region in which the irradiation response characteristic of the liquid crystal light valve is not deteriorated .
  5. Wherein the plurality of light emitting units, the lighting apparatus according to any one claim of claims 1 to 4, characterized in that a plurality of chip regions arranged two-dimensionally in a single solid light-emitting unit.
  6. The lighting device according to any one of claims 1 to 4 , wherein the plurality of light emitting units are a plurality of solid state light emitting units arranged two-dimensionally.
  7. The lighting device according to any one of claims 1 to 6 ,
    A spatial light modulator illuminated by illumination light from the illumination device;
    A projection apparatus comprising: a projection optical system that projects image light from the spatial light modulator.
  8. A plurality of image forming units for each color each having the illumination device according to any one of claims 1 to 6 and a spatial light modulation device illuminated by illumination light from the illumination device,
    A light combining member that combines and emits image light from the plurality of image forming units;
    A projection apparatus comprising: a projection optical system that projects image light combined through the light combining member.
  9. The light amount control means, in accordance with the luminance range written in the spatial light modulator, claim 7 and claim 8 wherein the plurality of light emitting portions, wherein the nonuniformly brightening or dimming The projection device according to one item.
  10. Further comprising a light amount adjusting switch, the light quantity control means, when detecting the operation of the light amount adjustment switch, the plurality of light emitting portions of claim 7 and claim 8, characterized in that non-uniform dimming The projection apparatus as described in any one of Claims.
JP2003076242A 2003-03-19 2003-03-19 Illumination device and projection device Expired - Fee Related JP4186662B2 (en)

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JP2006301325A (en) * 2005-04-21 2006-11-02 Victor Co Of Japan Ltd Image display apparatus
KR100724971B1 (en) * 2005-07-22 2007-06-04 삼성전자주식회사 Laser projector for controlling light source by itself
JP2007147870A (en) * 2005-11-25 2007-06-14 Sharp Corp Display device
US8096661B2 (en) 2006-06-29 2012-01-17 Sanyo Electric Co., Ltd. Projector having a cross-shaped light beam
JP5002228B2 (en) 2006-10-03 2012-08-15 キヤノン株式会社 Image display device
JP2009042352A (en) 2007-08-07 2009-02-26 Seiko Epson Corp Control system, projector, program, and information storage medium
JP4596194B2 (en) * 2010-01-18 2010-12-08 セイコーエプソン株式会社 Projector and control method
US8801194B2 (en) 2010-03-09 2014-08-12 Panasonic Corporation Projector with illumination control based on fixation degree
JP5984501B2 (en) * 2012-05-15 2016-09-06 三菱電機株式会社 Projection display
JP6037751B2 (en) * 2012-09-28 2016-12-07 三菱電機株式会社 Projection display

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