JP2004157346A - Diaphragm device and projector device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily improve the performance of a projector device by making the highness of contrast compatible with the highness of illuminance. <P>SOLUTION: A light beam transmitted through a liquid crystal panel is enlarged and projected to a screen by a projection lens. The projection lens is equipped with the diaphragm device 14. The characteristic of the contrast of the liquid crystal panel is different according to an incident angle and an incident direction. Then, a nearly triangular aperture part 16 is formed on the device 14 in accordance with the shape of the characteristic of the contrast. By forming the aperture part 16 in shape to make a rate at which only the light beam having high contrast passes high, the highness of the contrast of a projected image can be made compatible with the highness of the illuminance. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a diaphragm device and a projector device of a projector device that projects light modulated by a display device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there has been known a projector device that guides light emitted from a light source to a display device such as a liquid crystal panel via an illumination optical system, and projects light modulated by the display device onto a screen via a projection optical system ( For example, see Patent Document 1). The projection optical system of such a projector device is provided with a diaphragm device having a circular opening between the lens groups. Then, a configuration has been considered in which the contrast is improved by narrowing the aperture device, that is, by reducing the diameter of the aperture.
[0003]
[Patent Document 1]
JP-A-8-43729
[Problems to be solved by the invention]
However, when the diameter of the aperture of the diaphragm device is reduced as in the above-described conventional case, the amount of light passing through the diaphragm device is inevitably reduced, and there is a problem that the illuminance of the projected image is reduced while the contrast is improved.
[0005]
SUMMARY An advantage of some aspects of the invention is to provide an aperture device and a projector device that can achieve both contrast and illuminance.
[0006]
[Means for Solving the Problems]
The aperture device according to claim 1, wherein the aperture of the aperture device of the projector device projects light modulated by a display device, and a shape of an opening of the aperture device is different from an incident direction and an incident angle of the display device. It is provided corresponding to a position where the contrast is increased according to the characteristics.
[0007]
In this configuration, the contrast of the projected image and the illuminance are both compatible, as compared with the configuration in which the shape of the opening is circular.
[0008]
The aperture device according to claim 2, wherein the aperture device of the projector device projects light modulated by a display device, wherein the shape of the opening of the aperture device is such that the contrast with respect to the incident direction and the incident angle of the display device is different. According to the characteristics, a protruding portion is provided so as to mainly include a position where the contrast is high.
[0009]
In this configuration, as compared with a configuration in which the shape of the opening is circular, the brightness is improved while suppressing a decrease in contrast, and both the high contrast and the high illuminance of the projected image are achieved.
[0010]
According to a third aspect of the invention, there is provided a projector device provided with the light source, a display device for modulating light emitted from the light source, an optical system for projecting light from the light source through the display device, and the optical system. A diaphragm device according to claim 1 or 2 is provided.
[0011]
In this configuration, compared to a configuration in which the shape of the opening of the aperture device is circular, both high contrast and high illuminance of the projected image are achieved.
[0012]
A projector device according to a fourth aspect is the projector device according to the third aspect, wherein the display device is a liquid crystal panel.
[0013]
In this configuration, the contrast and the illuminance of an image to be projected are effectively compatible with each other in a liquid crystal panel whose contrast characteristic is deviated with respect to the incident direction and the incident angle.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of an aperture device and a projector device of the present invention will be described with reference to the drawings.
[0015]
2 and 3, reference numeral 1 denotes a projector device. The projector device 1 includes a light source (not shown) and three liquid crystal panels (LCD) as display devices which are modulation units for modulating light emitted from the light source. 3 and an optical system for enlarging and projecting the light emitted from the light source onto the screen S via the liquid crystal panel 3. The optical system includes an illumination optical system including a dichroic mirror for guiding light emitted from a light source to each liquid crystal panel 3 and a projection optical system 6 for projecting a light beam emitted from the liquid crystal panel 3 onto a screen S. Have. The projection optical system 6 combines dichroic prisms 8 that combine R (red), G (green), and B (blue) light emitted from the plurality of liquid crystal panels 3, and emits light from the dichroic prism 8. And a projection lens 10 for projecting light while expanding the light.
[0016]
The projection lens 10 includes a lens barrel 11, and the first to fifth lenses L1 to L5, the diaphragm device 14, and the sixth to eleventh lenses L6 are arranged in this order from the screen S side of the lens barrel 11. To L11 are arranged.
[0017]
As shown in FIG. 1, the aperture device 14 of the projection lens 10 has a light-transmitting opening 16 formed in a light-transmitting shielding portion 15, and the opening 16 has a circular shape. Rather, they are set in accordance with the viewing angle characteristics of the liquid crystal panel 3, that is, the characteristics of the incident direction and the contrast with respect to the incident angle, and are formed in an equilateral triangle in the present embodiment.
[0018]
Next, the viewing angle characteristics of the liquid crystal panel 3 will be described. 3 to 6 show the measurement method, and FIG. 7 shows the measurement results.
[0019]
The basic measurement conditions are set such that HV _DD = 15.5V, VV _DD = 15.5V, VVC = 7.0V, and Vcom = 6.6V for the drive voltage. The measurement temperature was 25 ° C., measurement points screen central point, meter the following measurement system I and the measuring system II, the video input signal voltage is Vsig, to the signal amplitude _{V AC,} Vsig = 7.0 ± V _AC [V].
[0020]
FIG. 3 shows a measurement system I in which an image projected from a projector device 1 on a screen S arranged at a position of A = 2000 mm is measured by a measurement device 22 via a luminance meter 21. The screen S is a glass bead type having a gain of 2.8. The projection lens 10 of the projector device 1 has a focal length of 80 mm and F1.9, a light source is a metal halide lamp with a color temperature of 7500 K ± 500 at 155 W, a magnification of 24 times, and a measurement diameter of 7 mmφ. The polarizing plate is EG-1224DU (trade name, manufactured by Nitto) or SKN-18242T (trade name, manufactured by Polatechno Co., Ltd.) or equivalent.
[0021]
4 and 5 show a measurement system II, in which the liquid crystal panel 3 is driven by a driving circuit 24, and a light beam emitted from a movable light source W is transmitted through the liquid crystal panel 3, and Light is received by a light receiving lens 26 movably provided facing the light source W about the center. The light receiving lens 26 is connected to a light detecting device 28 via an optical fiber 27, and the light detecting device 28 is further connected to a measuring device 29.
[0022]
In FIG. 5, 3a is a main body of the liquid crystal panel, 3b is a frame surrounding the main body, 3c is a flexible wiring, and 3d is a mark.
[0023]
FIG. 6 is a graph showing the relationship between the light angle [degree] incident on the liquid crystal panel 3 and the relative light intensity.
[0024]
In FIG. 7, CR indicates a contrast (ratio), and this CR is the surface luminance L at the center of the screen S when the input signal amplitude (V _AC ) is 0.5 V in the measurement system I. (White) and the surface luminance L (Black) when the input signal amplitude (V _AC ) is set to 4.5 V, and is calculated by the equation of CR = L (White) / L (Black). is there.
[0025]
The liquid crystal panel 3, which is an optical shutter that controls the arrangement of liquid crystal molecules and allows the change in the arrangement to be visually recognized in combination with a polarizing plate, has different characteristics depending on the incident angle of light. Is different not only in the incident angle but also in the incident direction. That is, as a general tendency, the contrast becomes higher as the incident angle of the light incident on the liquid crystal panel is higher, that is, closer to orthogonal (θ is smaller with respect to the Z axis). For this reason, in general, light having a low incident angle and low contrast is blocked by reducing the diameter of the circular opening to improve the contrast. However, the characteristics of the liquid crystal panel 3 vary depending on the incident direction (φ with respect to the Y axis). As shown in FIG. In a portion having a triangular shape and a relatively low contrast, a line connecting portions having the same contrast has a quadrangular shape in which each side is curved.
[0026]
Therefore, in the first embodiment shown in FIG. 1, the substantially triangular opening 16 is formed by focusing on the shape of the portion having a relatively high contrast. As described above, the shape of the opening 16 of the diaphragm device 14 is set to a shape corresponding to the viewing angle characteristic, that is, the shape of the opening 16 is opened corresponding to a position where a high contrast light beam passes. By forming the light beam passing through the opening 16 into a shape in which only a high-contrast light beam passes at a high rate, it is possible to achieve both high contrast and high illuminance of the projected image. That is, when trying to pass only high-contrast light, the diameter of the aperture must be reduced, and the aperture diameter, which is the light passage area of the aperture device 14, is kept large, compared to a circular aperture whose illuminance is reduced. A large amount of high light can be transmitted, and both high contrast and high illuminance can be achieved, and the performance of the projector device can be easily improved.
[0027]
In other words, since the protruding portion C is provided along the high-contrast portion from the center portion of the conventionally used circular shape, the illuminance is improved while suppressing the decrease in the contrast, and the contrast and the illuminance are improved. And the performance of the projector device can be easily improved.
[0028]
In the first embodiment shown in FIG. 1 described above, attention is paid to the shape of a portion having a relatively high contrast, the illuminance is improved as much as possible, and the shape is simplified so that the manufacturing cost can be reduced. Although the substantially triangular opening 16 from which the protruding portion C protrudes in three directions is formed, the present invention is not limited to this configuration, and the opening 16 may have another shape.
[0029]
That is, as in the second embodiment shown in FIG. 8, attention is paid to the shape of a portion having relatively high contrast, priority is given to improvement of contrast over improvement of illuminance, and the shape is simple and the manufacturing cost is reduced. In order to achieve the reduction, it is also possible to form substantially triangular openings 31 from which the protrusions C project in three directions.
[0030]
In addition, as in the third embodiment shown in FIG. 9, a substantially trapezoidal shape in which the projections C project in four directions in order to pay attention to the shape of a portion having relatively low contrast and to improve illuminance as much as possible. Opening 33 can be formed.
[0031]
Also, as in the fourth embodiment shown in FIG. 10, attention is paid to the shape of the portion having a relatively low contrast, and in order to improve the contrast and the illuminance as much as possible, a line connecting the portions having the same contrast is substantially formed. Along with this, it is also possible to form a substantially trapezoidal opening 35 in which each side where the protrusion C projects in four directions is curved inwardly.
[0032]
Further, as in the fifth embodiment shown in FIG. 11, attention is paid to the shape of a portion having a relatively low contrast, the contrast and the illuminance are improved as much as possible, and the light amount of the projected image is averaged. It is also possible to form a substantially square opening 37 having a curved shape in which each side where the protrusion C projects in four directions is curved inward substantially along the line connecting the parts having the same contrast.
[0033]
Note that the shape of the opening 16 of the aperture device 14 can be changed according to the viewing angle characteristics of the liquid crystal panel 3 as a display device if the characteristics are different.
[0034]
Although the transmissive liquid crystal panel 3 has been described as a display device, the present invention is not limited to this configuration, and can be applied to, for example, a reflective liquid crystal panel.
[0035]
【The invention's effect】
According to the diaphragm device of the first aspect, the shape of the opening of the diaphragm device is provided corresponding to the position where the contrast is high in accordance with the characteristics of the contrast with respect to the incident direction and the incident angle of the display device. Compared with a configuration having a circular shape, both high contrast and high illuminance of the projected image can be achieved.
[0036]
According to the diaphragm device of the second aspect, the shape of the opening of the diaphragm device projects in such a manner as to mainly include a position where the contrast is high in accordance with characteristics of contrast with respect to the incident direction and the incident angle of the display device. As compared with a configuration in which the shape of the opening is circular, the brightness is improved while suppressing a decrease in contrast, and both high contrast and high illuminance of the projected image are achieved.
[0037]
According to the projector device of the third aspect, since the aperture device of the first or second aspect is provided, compared with a configuration in which the shape of the opening of the aperture device is circular, the height of the contrast and the illuminance of the projected image are higher. Can be compatible with height.
[0038]
According to the projector device of the fourth aspect, in addition to the effects of the third aspect, the contrast characteristic of the projected image and the illuminance of the image to be projected on the liquid crystal panel whose contrast characteristics are deviated with respect to the incident direction and the incident angle. Height can be effectively balanced.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a first embodiment of a diaphragm device according to the present invention.
FIG. 2 is a cross-sectional view of a part of a projector device including the stop device.
FIG. 3 is a measurement system for measuring a viewing angle characteristic of a liquid crystal panel provided in the projector device.
FIG. 4 is a measurement system for measuring viewing angle characteristics of the liquid crystal panel.
FIG. 5 is a measurement system for measuring viewing angle characteristics of the liquid crystal panel.
FIG. 6 is a graph showing the relationship between the angle of light incident on the liquid crystal panel and the relative light intensity.
FIG. 7 is a graph showing measurement results of viewing angle characteristics of the liquid crystal panel.
FIG. 8 is an explanatory view showing a second embodiment of the aperture device of the present invention.
FIG. 9 is an explanatory view showing a third embodiment of the aperture device of the present invention.
FIG. 10 is an explanatory view showing a fourth embodiment of the diaphragm device of the present invention.
FIG. 11 is an explanatory view showing a fifth embodiment of the diaphragm device of the present invention.
[Explanation of symbols]
Reference Signs List 1 Projector device 3 Display panel 14 as display device Aperture device 16, 31, 33, 35, 37 Opening C Projection

Claims (4)

An aperture device of a projector device that projects light modulated by a display device,
The aperture device of the aperture device is provided with a shape corresponding to a position where the contrast is high in accordance with characteristics of contrast with respect to an incident direction and an incident angle of the display device. An aperture device of a projector device that projects light modulated by a display device,
The aperture of the aperture device has a shape in which a projection is provided so as to mainly include a position where the contrast is high according to characteristics of contrast with respect to an incident direction and an incident angle of the display device. apparatus. A light source,
A display device that modulates light emitted from the light source,
An optical system that projects the light of the light source through the display device,
A projector device comprising: the diaphragm device according to claim 1 provided in the optical system. The projector device according to claim 3, wherein the display device is a liquid crystal panel.

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