JP2002072355A - Projection type image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To excellently display a moving picture by a projection type image display device by making the black matrix inconspicuous on a projected image without lowering the display performance. SOLUTION: A projection lens 701 has its internal element lens 101 which is movable within a specific range vertically at right angles to the optical axis OA. An actuator part 10 vibrates the element lens 101 to specific amplitude width with field cycles according to the vertical synchronizing signal separated from an input video signal Sv so as to cause the element 101 to have a vertical optical-axis shifted perpendicularly to the optical axis OA. Consequently, part of each pixel pattern 202 and part of a BM pattern 201 are overlapped with the field cycle in the projected image Ps on the screen, and a human views the image as if the longitudinal width 202C of each pixel pattern 202 were expanded. Consequently, the BM pattern 201 becomes inconspicuous.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a dot matrix type light valve such as a liquid crystal panel, and spatially modulates the light emitted from a light source based on an input signal and projects it on a screen in an enlarged manner. And a projection type image display device for displaying an image represented by the input signal.

[0002]

2. Description of the Related Art In recent years, small televisions and laptop OAs have been developed.
Devices using a liquid crystal panel, which is one of dot matrix type light valves, as a display device, such as devices, have been actively commercialized. Among them, a projection-type image display device such as a liquid crystal projector has attracted attention as a large-screen display device.

In a projection type image display apparatus using a liquid crystal panel for a dot matrix type light valve, an active matrix type liquid crystal panel using a thin film transistor (TFT) is currently widely used. In this TFT active matrix type liquid crystal panel, in the liquid crystal layer other than the display electrode of each pixel,
The transmittance cannot be controlled. In addition, when light is applied to the channel portion of the TFT, the leakage current when the TFT is off increases due to the photoexcitation current, and the voltage holding ratio when the TFT is off becomes insufficient. In particular, in a normally white mode liquid crystal panel, portions other than the display electrodes are in a light transmitting state, so that the contrast is reduced unless the light is sufficiently shielded.
Therefore, conventionally, in order to obtain a sufficient contrast, a countermeasure that a black matrix is formed on the counter electrode substrate of the TFT to shield light from sneaking into the TFT and light leakage from other than the display electrode. It has been done.

On the other hand, a liquid crystal projector is a conventional CRT.
The projector has advantages that it can be made smaller and lighter, is not affected by geomagnetism, and can ensure convergence accuracy uniformly over the entire display. But,
Since the size of the projection optical system is being reduced in order to reduce the size and weight of the liquid crystal projector, there is a problem that the black matrix is conspicuous. In other words, the number of pixels of the liquid crystal panel is increasing in order to increase the definition of the display, but on the other hand, since the projection optical system is being reduced in size, a small and high-definition liquid crystal panel is required. As a result, a large pixel aperture ratio cannot be obtained. This means that the width of the black matrix between the pixel openings is increased, whereby the black matrix between the pixel openings is conspicuous when the image is enlarged and projected on the screen, and the roughness during reproduction of a moving image is increased. . Therefore, there is an urgent need to develop a liquid crystal panel having a high aperture ratio and a technique for making a black matrix difficult to see.

FIG. 8 is a conceptual diagram showing the configuration and principle of a projection lens 801 as a projection optical system in a conventional liquid crystal projector. In this liquid crystal projector, a light beam from a light source (not shown) is spatially modulated by a liquid crystal panel on which a display image P is formed, enters a projection lens 801, passes through the projection lens 801, and passes through a screen. Is projected to The projected light forms a projection image Ps on the screen. That is, a display image P is formed on the liquid crystal panel based on a predetermined video signal input to the liquid crystal projector, and this display image P is enlarged and projected on the screen by the projection lens 801 so that the projection image Ps is formed on the screen. Is displayed.

FIG. 9A is an enlarged view partially showing details of the projection image Ps on the screen. As shown in this figure, in this projected image Ps, a rectangular pattern (hereinafter referred to as “pixel pattern”) 902 corresponding to the pixel opening of the liquid crystal panel is in the left-right direction (the horizontal scanning direction of the video signal; ) And in the vertical direction (the vertical scanning direction of the video signal; hereinafter also referred to as the “vertical direction”). The pixels are regularly arranged two-dimensionally. (Hereinafter, the portion corresponding to the black matrix in the projection image Ps is referred to as a “BM pattern”).

FIG. 9B shows the luminance on the straight line AB in the projected image Ps shown in FIG. 9A, the vertical axis represents the position on the straight line AB, and the horizontal axis is the projected image. It represents the luminance of Ps (luminance on the screen). As can be seen from this figure, the luminance of the portion corresponding to the vertical width 901V of the BM pattern 901 and the luminance of the portion corresponding to the vertical width 902V of the pixel pattern 902 are significantly different. There is a step. Similarly, a luminance step occurs in the horizontal direction.

As described above, in a projection type image display device using a dot matrix type light valve such as a liquid crystal panel, a luminance step corresponding to the BM pattern occurs in a projected image. Further, as described above, in order to reduce the size and weight of the projection type image display device itself, the liquid crystal panel has been reduced in size from 1.3 inches to 0.9 inches and further to 0.7 inches. In addition, since the display image is in the direction of higher definition, the aperture ratio indicating the ratio of the aperture through which light is transmitted to the black matrix is further reduced. Therefore, when the display image on the liquid crystal panel is enlarged and displayed as a projection image on the screen by the projection lens, the pixel structure itself of the liquid crystal panel in the projection image can be clearly seen like a mosaic, and particularly when a moving image is projected. Gives a bad impression of looking at the image through the screen.

On the other hand, as a simple method of making the pixel structure inconspicuous in a projected image, it is conceivable to project the image by defocusing the focus of the projection lens so that the black matrix becomes inconspicuous. However, in this method, the projected image itself also has a blurred impression. further,
Normally, the projection lens has an MT on and off the optical axis.
Since the defocus characteristics of F (Modulation Transfer Function) are different, it is difficult to make the black matrix inconspicuous uniformly over the entire screen. For example, there may be a case where the black matrix is hardly seen in the periphery and the vicinity on the axis is clearly seen in some cases. Alternatively, the black matrix near the on-axis is difficult to see, but off-axis, the image itself may be too blurry to see.

As another method for making the pixel structure inconspicuous in a projected image, there is a method in which a diffraction grating is provided between the projection lens and the liquid crystal panel, and a black matrix is blurred by diffracted light. However, in this method, the sense of focus is lowered, and as a result, the sharpness of the image is lowered, and the image tends to be blurred, so that the impression of the displayed image is deteriorated.

Further, JP-A-4-113308 and JP-A-5-28904 disclose that a black matrix is hardly seen by using a rotation control liquid crystal panel and a birefringent optical element to increase the number of pixels in a pseudo manner. A method of obtaining a high-resolution projected image is disclosed. The methods disclosed in these publications employ a configuration in which a rotation control liquid crystal panel and a birefringent optical element are arranged in a series of order between a liquid crystal panel and a projection lens. This method is useful for a projection type image display device that displays a single liquid crystal panel. However, a projection-type image display device having three times the pixel density of a single liquid crystal panel display using a configuration in which three liquid crystal panels of red, blue, and green are used and color separation and color synthesis are performed optically is performed. When a dichroic prism is used as the synthesizing means, there arises a problem of selectively transmitting polarized light and selectively reflecting polarized light. Specifically, blue and red polarized light that should be reflected on the reflecting surface of the dichroic prism is transmitted through the reflecting surface depending on the vibration direction.
As a result, the transmitted polarized light does not enter the projection lens. In addition, when a dichroic mirror is used, a problem arises due to a difference in wavelength dependency between S-polarized light and P-polarized light having polarization planes orthogonal to each other. Specifically, since the wavelength characteristics of reflection and transmission of the dichroic mirror differ depending on the vibration direction of the polarized light, a color change occurs. Accordingly, it is difficult to use the above method in a configuration in which the specific optical elements are arranged in a series for each color.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problem, and it is possible to satisfactorily form a moving image by making a black matrix inconspicuous in a projected image without deteriorating display performance. It is an object of the present invention to provide a projection type image display device capable of displaying.

[0013]

According to a first aspect of the present invention, light emitted from a light source is spatially modulated on the basis of an input signal and enlarged and projected on a screen.
A projection-type image display device that displays an image represented by the input signal, the image display device including a plurality of pixel openings arranged two-dimensionally in a vertical direction and a horizontal direction, and a light flux of light emitted from the light source. The screen comprises a modulating means comprising a dot matrix type light valve which spatially modulates according to the input signal, and a lens group arranged on a predetermined optical axis, and the light whose light flux is modulated by the modulating means is transmitted to the screen. A projection optical system for magnifying and projecting the above, and at least one lens included in the lens group constituting the projection optical system so as to cause an optical axis shift in a direction perpendicular to the optical axis. And vibrating means for vibrating.

According to the first aspect, at least one lens included in the projection optical system vibrates so as to cause an optical axis shift in a direction perpendicular to the optical axis, so that a light valve is provided in a projected image on a screen. As a result, a pixel pattern representing a pixel opening of a liquid crystal panel or the like and a BM pattern representing a black matrix are superimposed, and to the human eye, the pixel pattern appears to be spread in a pseudo manner. As a result, BM
Since the pattern becomes inconspicuous, it is possible to eliminate a situation in which the input signal represents a moving image and gives a bad impression as if the user were viewing the image through a screen.

In a second aspect based on the first aspect, the vibrating means is adjacent to the pixel pattern representing the pixel opening in the vibration direction in a projected image displayed on the screen by the projection optical system. The at least one lens is vibrated so that the projection image vibrates at an amplitude equal to or less than half the interval between the pixel patterns.

According to the second aspect of the present invention, the amplitude of the vibration of the pixel pattern in the projected image is equal to or less than 1/2 of the interval between the adjacent pixel patterns in the vibration direction, so that the adjacent pixel patterns are prevented from overlapping due to the vibration. be able to. For this reason, the BM pattern (black matrix) can be made inconspicuous while suppressing the deterioration of the display performance due to the vibration of the pixel pattern.

In a third aspect based on the first aspect, the vibration means causes the at least one lens to shift the optical axis in one or both of a vertical direction and a horizontal direction perpendicular to the optical axis. Vibrating the at least one lens so as to wake it up.

According to the third aspect, when at least one lens included in the projection optical system vibrates in the vertical direction perpendicular to the optical axis, the pixel pattern in the projected image on the screen is pseudo in the vertical direction. When the lens vibrates in the left-right direction perpendicular to the optical axis, it appears that the pixel pattern in the projected image on the screen is pseudo-spread in the left-right direction. As a result, the BM pattern (black matrix) becomes inconspicuous in the projected image. Further, when the lens vibrates in both the left and right directions and the vertical direction perpendicular to the optical axis, the pixel pattern in the projected image on the screen appears to spread in both the left and right directions and the vertical direction. In addition, the black matrix can be made less noticeable in the projected image.

In a fourth aspect based on the first aspect, the vibrating means causes the at least one lens to shift the optical axis in an oblique direction perpendicular to the optical axis. Is vibrated.

According to the fourth aspect, at least one lens included in the projection optical system oscillates in an oblique direction perpendicular to the optical axis, so that the human eye can see the pixel pattern in the projected image on the screen. It looks like it spreads in an oblique direction. That is, it appears that both the vertical width and the horizontal width of the pixel pattern are pseudo-expanded.
The pattern becomes less noticeable.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the apparatus further comprises ON / OFF switching means for setting whether to operate or stop the vibration means.

According to the fifth aspect, the ON / OFF switching means selects whether to vibrate or stop the lens included in the projection lens according to whether the image represented by the input signal is a moving image or a still image. be able to. Therefore, when an input signal is received from a personal computer or the like and a still image composed of character information often used for presentation is displayed as a projection image, the BM pattern is sharpened in the projection image by stopping the vibration means. It is possible to make characters and the like clearly visible. On the other hand, when an input signal representing a moving image is received and the moving image is displayed as a projection image, the BM pattern is made inconspicuous in the projection image by operating the vibration means, and the image is viewed through the screen door. It is possible to eliminate such a bad impression.

In a sixth aspect based on any one of the first to fourth aspects, the input signal is a video signal of an interlaced scanning system in which each frame includes an even field and an odd field, and the vibration means Is characterized in that the at least one lens is vibrated at the same cycle as a field cycle of the input signal based on a synchronization signal of the input signal.

According to the sixth aspect, since at least one lens included in the projection optical system vibrates at the field period of the input signal, the projected image also vibrates at the field period, that is, at a speed that cannot be recognized by the naked eye. In the projected image, the pixel pattern appears to spread in a pseudo manner. As a result, the BM pattern becomes inconspicuous in the projected image.

In a seventh aspect based on the first aspect, the input signal is a video signal of an interlaced scanning system in which each frame is composed of an even field and an odd field, and the oscillating means comprises Based on the synchronization signal of the input signal, switching of the field is performed at the same cycle as the field cycle of the input signal so as to cause the lens to shift the optical axis corresponding to の of the vertical pitch of the pixel opening. The at least one lens is vibrated synchronously.

According to the seventh aspect, at least one lens included in the projection optical system causes the input signal to shift so as to cause an optical axis shift corresponding to の of the vertical pitch of the pixel opening in the light valve. Vibrates at the same cycle as the field cycle of the field and in synchronization with the switching of the field. As a result, the projected image of the odd field and the projected image of the even field are displayed on the screen with a shift of 1/2 of the vertical pitch of the pixel pattern in each frame.
As a result, to the human eye, the projected image is visually recognized as a high-definition image in which the number of pixels in the vertical direction (vertical direction) is increased in a pseudo manner. Therefore, when the input signal is a signal representing a high-definition image, an inexpensive liquid crystal panel (for example, a pixel having a number of pixels equivalent to an NTSC signal) can be used as a light valve without processing such as reducing the amount of information included in the input signal. A high-definition image can be displayed on a projection type image display device using a liquid crystal panel). In the projected image,
Since the pixel pattern and the BM pattern are superimposed in the field cycle, the BM pattern becomes inconspicuous.

According to an eighth aspect of the present invention, in any one of the first to seventh aspects, a color separation optical system for separating light from the light source into light of three colors of red, blue and green; A color synthesizing optical system for synthesizing light, wherein the modulating means includes a dot matrix type light valve that modulates the luminous flux of the three colors of light obtained by the color separation optical system according to the video signal, The color synthesizing unit generates the synthesized light by synthesizing the three colors of light whose light fluxes are modulated by the modulation unit, and the projection optical system enlarges and projects the synthesized light on the screen. And

According to the eighth aspect, when the input signal represents a color image, the color image can be displayed on the screen as a projected image.
The pattern can be made inconspicuous.

According to a ninth invention, in any one of the first to seventh inventions, the dot matrix type light valve in the modulation means is a liquid crystal panel.

According to a tenth aspect, there is provided a projection type image display apparatus for displaying an image represented by an input signal by spatially modulating light emitted from a light source based on the input signal and projecting the light on a screen in an enlarged manner. A dot matrix type light having a plurality of pixel openings arranged two-dimensionally in a vertical direction and a horizontal direction, and spatially modulating a luminous flux of light emitted from the light source according to the input signal; A modulating means comprising a valve, a projection optical system for enlarging and projecting the light modulated by the modulating means on the screen,
Vibrating means for vibrating the light valve at a predetermined amplitude in a direction parallel to a plane on which the pixel openings are arranged.

According to the tenth aspect, the light valve vibrates in a direction parallel to the plane on which the pixel openings are arranged, so that the pixel pattern representing the pixel openings and the black matrix are projected on the screen. The BM pattern is superimposed on the BM pattern, and the pixel pattern appears to human eyes as if it were pseudo widened, and the BM pattern becomes inconspicuous.
For this reason, when an input signal represents a moving image, it is possible to eliminate a situation in which a bad impression that an image is viewed through a screen is given.

According to an eleventh aspect, in the tenth aspect,
The vibration means may vibrate the light valve with an amplitude equal to or less than の of an interval between the pixel openings adjacent to each other in a vibration direction.

According to the eleventh aspect, the amplitude of the vibration of the pixel pattern in the projected image is 以下 or less of the interval between the adjacent pixel patterns in the vibration direction, so that the adjacent pixel patterns are prevented from overlapping due to the vibration. be able to.

[0034]

Embodiments of the present invention will be described below with reference to the accompanying drawings. <First Embodiment> FIG. 1 is a block diagram showing a configuration of a liquid crystal projector which is a projection type image display device according to a first embodiment of the present invention. This projection type image display device
This is a system using a cross prism, which is currently the mainstream in liquid crystal projectors. The optical system in this projection type image display device includes a projection lens 701 and a light source 702.
, A reflector 703, a first illumination lens array 704a, a second illumination lens array 704b, first to fourth total reflection mirrors 705a to 705d, a blue transmission dichroic mirror 706B, and a green reflection dichroic. A mirror 706G, a first relay lens 707a,
The second relay lens 707b, the first to third condenser lenses 708G, 708B, 708R, the blue liquid crystal panel 709B, the green liquid crystal panel 709G, the red liquid crystal panel 709R, and the color combining prism 710 Have. This projection type image display apparatus further includes a projection lens 7
01, and an actuator unit 10 for vibrating the constituent lens 101, which is a single lens, and receives an input video signal Sv from the outside and generates a red video signal Sr, a green video signal Sg, and a blue video signal Sb. A video circuit 20 for generating and separating and outputting the vertical synchronization signal Vsync from the input video signal Sv. In the following, it is assumed that the input video signal Sb is a video signal of an interlaced scanning system in which each frame includes an even field and an odd field (the same applies to other embodiments).

In the above-mentioned projection type image display apparatus, the light source 702 forms an arc by the discharge between the electrodes included in the light source 702 to generate and output a randomly polarized light. The reflector 703 has a rotation symmetry axis, and reflects the output light Lw from the light source 702 in one direction on the rotation symmetry axis. The output light Lw from the light source 702 is reflected directly or by the reflector 703 to form a first illumination lens array 704a.
Incident on. The first illumination lens array 704a converts the light source image into a rectangle based on the output light Lw. The rectangularly converted light source image passes through a first total reflection mirror 705a, and then is passed through various optical members to be described later for red, blue, and so on by a second illumination lens array 704b through various optical members described below.
Each of the green liquid crystal panels 709R, 709G, and 709B is illuminated.

Light Lw from the second illumination lens array 704b is incident on a blue transmission dichroic mirror 706B, and only the blue light Lb of the incident light is transmitted through the blue transmission dichroic mirror 706B, and the other light is reflected. I do.
Blue light L transmitted through blue transmission dichroic mirror 706B
b is reflected by the second total reflection mirror 705b, passes through the first condenser lens 708B, and is supplied to the blue liquid crystal panel 70b.
9B. The light reflected by the blue transmission dichroic mirror 706B, that is, light composed of green light and red light, is incident on the green reflection dichroic mirror 706G, and of the incident light, only the green light Lg is the green reflection dichroic mirror 706G.
The red light Lr, which is reflected by the light and transmitted through the green reflecting dichroic mirror 706G, is the other light. The green light Lg reflected by the green reflecting dichroic mirror 706G passes through the second condenser lens 708G to the green liquid crystal panel 70.
It reaches 9G. On the other hand, a green reflecting dichroic mirror 706
The red light Lr transmitted through G is transmitted to the first relay lens 707
a, a liquid crystal panel for red 709R via a third total reflection mirror 705c, a second relay lens 707b, a fourth total reflection mirror 705d, and a third condenser lens 708R.
Leads to. Thus, the output light Lw from the light source is decomposed into red light Lr, green light Lg, and blue light Lb by the color separation optical system configured using the blue transmission dichroic mirror 706B and the green reflection dichroic mirror 706G, These lights are transmitted to the liquid crystal panel 709R for red and the liquid crystal panel 7 for green.
09G and the blue liquid crystal panel 709B, respectively.

The red liquid crystal panel 709R, the green liquid crystal panel 709G, and the blue liquid crystal panel 709B include the video circuit 20.
Red image signal Sr and green image signal S generated by
g and the blue video signal Sb are input. The red liquid crystal panel 709R spatially changes the amount of transmitted light according to the red video signal Sr, and thereby, among the images represented by the input video signal Sv, an image corresponding to a red image (hereinafter referred to as a “red liquid crystal display image”). "). The green liquid crystal panel 709G spatially changes the amount of transmitted light in accordance with the green video signal Sg, so that the image represented by the input video signal Sv corresponds to the green image (hereinafter, the “green liquid crystal display image”). "). LCD panel for blue 709
B spatially changes the amount of transmitted light in accordance with the blue video signal Sb, thereby displaying an image corresponding to a blue image (hereinafter, referred to as a “blue liquid crystal panel display image”) among the images represented by the input video signal Sv. Form. Therefore, when the red light Lr passes through the red liquid crystal panel 709R, its light flux is spatially modulated according to the display image of the red liquid crystal panel, and the green light Lg passes through the green liquid crystal panel 709G. The light flux is spatially modulated according to the display image for the green liquid crystal panel, and the blue light Lb passes through the liquid crystal panel for blue 709B, so that the light flux is spatially modulated according to the display image for the blue liquid crystal panel. Modulated.

Thus, each of the liquid crystal panels 709R, 7
Lights Lrm, Lgm, and Lbm modulated by 09G and 709B are:
The light enters the color combining prism 710. Color synthesis prism 71
0 is obtained by bonding four prisms each having a triangular prism so that the blue reflecting dichroic mirror surface 710b and the red reflecting dichroic mirror surface 710r are arranged orthogonally.
Generally, it is called a “cross prism”. The blue light Lbm and the red light Lrm incident on the color combining prism 710 are reflected and incident on the projection lens 701. Green light Lgm
Are transmitted through the blue reflecting dichroic mirror surface 710b and the red reflecting dichroic mirror surface 710r, and
01 is incident. Thus, each liquid crystal panel 709
Lights Lrm, Lgm, and Lbm of each color representing each liquid crystal display image (liquid crystal panel display image for red, liquid crystal panel display image for green, and liquid crystal panel display image for blue) by R, 709G, and 709B are:
After being combined with each other by the color combining prism 710, they are enlarged and projected on a screen (not shown) by the projection lens 701.

FIG. 2 is a conceptual diagram showing the configuration and principle of the projection lens 701 in the projection type image display device according to this embodiment. The projection lens 701 includes a lens group arranged on a preset optical axis OA. The configuration of the lens group is the same as that of the projection lens 801 (FIG. 8) in the conventional projection type image display device. Are identical. However, the projection lens 701 according to the present embodiment has a structure in which a predetermined constituent lens 101 constituting the lens group can move within a predetermined range in a vertical direction perpendicular to the optical axis OA. Is different from the projection lens 801 of FIG. The actuator section 10 is a linear actuator that vibrates the constituent lens 101 based on the vertical synchronization signal Vsync from the video circuit 20. This vibration operation causes the constituent lens 101 to shift the optical axis in the vertical direction perpendicular to the optical axis OA. Wake up.

In FIG. 2, reference symbol P denotes each liquid crystal display image (liquid crystal panel display image for red, liquid crystal panel display image for green,
(A liquid crystal panel display image for blue). Reference numeral Ps represents a projection image obtained by enlarging and projecting the liquid crystal panel display image P on the screen by the projection lens 701.

FIG. 3A is an enlarged view partially showing the details of the projection image Ps on the screen. When the constituent lens 101 of the projection lens 701 is not misaligned with respect to the optical axis OA, as shown by a solid line in FIG. 3A, each liquid crystal panel 709R, 709G, 70
Pixel Pattern 202 Corresponding to Pixel Opening in 9B
Are regularly and two-dimensionally arranged in the horizontal direction (the horizontal scanning direction of the image represented by the input video signal Sv) and the vertical direction (the vertical scanning direction of the image represented by the input video signal Sv). Further, the pattern 201 corresponding to the area between the pixel patterns 202 arranged as described above is
It is a BM pattern corresponding to a black matrix in R, 709G, and 709B.

As described above, in the present embodiment, the actuator unit 10 is perpendicular to the optical axis OA so that the constituent lens 101 is displaced in the vertical direction (vertical scanning direction) perpendicular to the optical axis OA. The constituent lens 101 is vibrated in the vertical direction. At this time, the actuator unit 10
0 based on the vertical synchronization signal Vsync from 0.
The constituent lens 101 is vibrated at the same cycle as the field cycle of (1). Accordingly, the optical path from the projection lens 701 to the screen vibrates in the vertical direction perpendicular to the optical axis OA at the field cycle, and the projection image Ps also vibrates at the field cycle.
As a result, as shown by the dotted line in FIG. 3A, in the projected image Ps, a part of each pixel pattern 202 and a part of the BM pattern 201 are superimposed in the vertical direction at a field cycle, and are not recognized by human eyes. , The pixel opening appears to be widened. That is, the brightness on the straight line AB in the projection image Ps (the brightness obtained by adding the brightness for each of the two fields) is as shown in FIG. 3B. Specifically, the luminance K2 of the portion of the BM pattern 201 that is superimposed on the pixel pattern 202 is one of the luminance K1 of the portion of the pixel pattern 202 that is not superimposed on the BM pattern 201.
/ 2. For this reason, the luminance step when the constituent lens 101 is vibrated is about の of the luminance step when the constituent lens 101 is not vibrated. Therefore, the vertical width of each pixel pattern 202 is 2 due to the vibration of the constituent lens 101.
02V appears to spread in a simulated manner,
The vertical width 201V of the BM pattern 201 appears to be reduced in a pseudo manner. As a result, the BM pattern 201 becomes difficult to see.

In the above embodiment, the vibration width of the constituent lens 101 is adjusted according to the width of the BM pattern which is a black matrix on the screen surface.
Needless to say, the lens is designed such that the performance of the projection lens 701 itself does not extremely deteriorate due to the vibration of the constituent lens 101. Here, the adjacent pixel pattern 20 in the projection image Ps on the screen
In order to avoid the overlap between the pixel patterns 202 due to the vibration, the projection image Ps vibrates with an amplitude of 以下 or less (in this embodiment, 以下 or less of the vertical width 201V of the BM pattern) in the vibration direction. Thus, it is preferable to set the vibration width of the constituent lens 101. In the above embodiment, the vibration cycle of the constituent lens 101 is the same as the field cycle of the input video signal Sv. However, the vibration cycle may be shorter than the field cycle, or may be changed depending on the vibration of the constituent lens 101. The period may be longer than the field period as long as the period causes the projected image Ps to vibrate at such a speed that it cannot be recognized by the naked eye.

As described above, according to the present embodiment, by vibrating the constituent lens 101 in the vertical direction, the BM pattern (black matrix) becomes inconspicuous because the pixel pattern appears to spread in the vertical direction. In the case where the signal Sv represents a moving image, it is possible to almost eliminate a situation in which a bad impression as if viewing the image through a screen door is given.

In the above embodiment, the constituent lens 101 is vibrated in the up-down direction. Alternatively, the constituent lens 101 may be vibrated in the left-right direction (horizontal scanning direction). That is, the projection lens 701 is configured so that the constituent lens 101 can move within a predetermined range in the left-right direction perpendicular to the optical axis OA, and causes the constituent lens 101 to shift the optical axis in the left-right direction perpendicular to the optical axis OA. Thus, the actuator unit 10 may be configured to vibrate the constituent lens 101. In this case, the width 202 of each pixel pattern 202
H appears to have spread in a pseudo manner, and accordingly, BM
The width 201H of the pattern appears to be reduced in a pseudo manner. As a result, the BM pattern becomes difficult to see. Therefore, even with such a configuration, the same effect as in the above embodiment can be obtained. Also in this configuration, the vibration width of the constituent lens 101 is adjusted according to the width of the BM pattern which is a black matrix on the screen surface, and the performance of the projection lens 701 itself is reduced by the vibration of the constituent lens 101. It goes without saying that the lens is designed so as not to be extremely deteriorated. Here, in order to avoid adjacent pixel patterns 202 from being overlapped by vibration in the projected image Ps on the screen,
1/2 of the interval between pixel patterns 202 adjacent in the vibration direction
The following (in this case, の of the BM pattern width 201H)
It is preferable to set the oscillation width of the constituent lens 101 so that the projection image Ps oscillates with the following amplitude.

<Second Embodiment> Next, a liquid crystal projector as a projection type image display device according to a second embodiment of the present invention will be described.

The overall configuration of the projection type image display apparatus according to this embodiment is basically the same as that of the first embodiment, and is as shown in FIG. Further, the configuration of the projection lens in the present embodiment (hereinafter, denoted by reference numeral 701b to distinguish it from the projection lens 701 in the first embodiment) is basically the same as that in the first embodiment. This is the same as the projection lens 701 (see FIG. 2). Therefore, among the components in the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. Also, the overall operation of this embodiment is basically the same as that of the first embodiment.
A detailed description is omitted, and the following description focuses on the differences.

Also in the projection lens 701b of this embodiment, the constituent lens 101 is configured to be movable within a predetermined range in a direction perpendicular to the optical axis OA. However, in the present embodiment, the constituent lens 101 is configured to be movable in an oblique direction perpendicular to the optical axis OA, and in this regard, the first embodiment in which the constituent lens 101 is configured to be movable in the vertical direction. It is different from the form. Correspondingly, the actuator section in the present embodiment (hereinafter, this is indicated by reference numeral 10b to distinguish it from the actuator section 10 in the first embodiment) is provided by a vertical synchronizing signal from the video circuit 20. Based on Vsync, the constituent lens 101 is vibrated in an oblique direction perpendicular to the optical axis OA. Here, the “oblique direction” means a direction between the vertical direction (vertical scanning direction) and the horizontal direction (horizontal scanning direction), that is, a direction oblique to the pixel arrangement direction in the liquid crystal panel. Direction or a direction forming 45 degrees with respect to the left-right direction.

FIG. 4A is an enlarged view partially showing details of a projection image Ps (see FIG. 2) enlarged and projected on a screen by the projection lens 701b in the present embodiment. FIG. 4A shows a state in which the constituent lens 101 of the projection lens 701b is not misaligned with respect to the optical axis OA.
As shown by the solid line in FIG.
The pixel patterns 302 corresponding to the pixel openings in 09G and 709B correspond to the horizontal direction (the horizontal scanning direction of the image represented by the input video signal Sv) and the vertical direction (the input video signal Sv).
Are arranged regularly and two-dimensionally in the direction of vertical scanning of the image represented by. The pattern 301 corresponding to the area between the pixel patterns 302 arranged as described above is a BM pattern corresponding to a black matrix in the liquid crystal panels 709R, 709G, and 709B.

In the present embodiment, the component lens 101 is caused to shift the optical axis in an oblique direction perpendicular to the optical axis OA.
The actuator unit 10b vibrates the constituent lens 101 in an oblique direction perpendicular to the optical axis OA. At this time, based on the vertical synchronization signal Vsync, the actuator unit 10b operates the constituent lens 1 at the same cycle as the field cycle of the input video signal Sv.
01 is vibrated. As a result, the optical path from the projection lens 701b to the screen vibrates in the oblique direction perpendicular to the optical axis OA at the field cycle, and the projection image Ps also vibrates at the field cycle. As a result, as shown by a dotted line in FIG. 4A, in the projected image Ps, a part of each pixel pattern 302 and a part of the BM pattern 301 are superimposed in a diagonal direction at a field cycle, and are not recognized by human eyes. , The pixel opening appears to expand in an oblique direction. For example, the brightness on the straight line AB in the projection image Ps (the brightness obtained by adding the brightness for each of the two fields) is as shown in FIG. Specifically, the luminance K2 of the portion of the BM pattern 301 that overlaps with the pixel pattern 302 is の of the luminance K1 of the portion of the pixel pattern 302 that does not overlap with the BM pattern 301. For this reason, when the component lens 101 is vibrated, the luminance step is changed by the component lens 10.
This is approximately の of the luminance step when 1 is not vibrated. Therefore, due to the vibration of the constituent lens 101, the vertical width 302V of each pixel pattern 302 appears to be pseudo-expanded, and the horizontal width 302H of each pixel pattern 302 appears to be pseudo-expanded. Along with this, the vertical width 301V of the BM pattern 301 looks pseudo narrowed, and the horizontal width 301H of the BM pattern 301 looks pseudo narrow. As a result, the BM pattern 301 becomes difficult to see.

In the above embodiment, the vibration width of the constituent lens 101 is adjusted according to the width of the BM pattern which is a black matrix on the screen surface.
Needless to say, the lens is designed so that the performance of the projection lens 701b itself does not extremely deteriorate due to the vibration of the constituent lens 101. Here, the pixel pattern 3 adjacent to the projected image Ps on the screen
In order to avoid overlapping of the BM patterns 02 due to the vibration, the amplitude is set to で of the interval between the pixel patterns 302 adjacent in the vibration direction (in the present embodiment, 以下 or less of the interval between the BM patterns 302 adjacent in the oblique direction). It is preferable to set the vibration width of the constituent lens 101 so that the projection image Ps vibrates. In the above embodiment, the vibration cycle of the constituent lens 101 is the same as the field cycle of the input video signal Sv. However, the vibration cycle may be shorter than the field cycle, or may be changed depending on the vibration of the constituent lens 101. The period may be longer than the field period as long as the period causes the projected image Ps to vibrate at such a speed that it cannot be recognized by the naked eye.

As described above, according to this embodiment, by vibrating the constituent lens 101 in the oblique direction, the pixel pattern 302 appears to spread in the oblique direction and the BM pattern (black matrix) becomes inconspicuous.
In the case where the input video signal Sv represents a moving image, it is possible to substantially eliminate a situation in which a bad impression as if viewing the image through a screen door is given.

<Third Embodiment> Next, a liquid crystal projector which is a projection type image display device according to a third embodiment of the present invention will be described.

The overall configuration of the projection type image display apparatus according to this embodiment is basically the same as that of the first embodiment, and is as shown in FIG. Further, the configuration of the projection lens in the present embodiment (hereinafter, referred to as reference numeral 701c to distinguish it from the projection lens 701 in the first embodiment) is basically the same as that in the first embodiment. This is the same as the projection lens 701 (see FIG. 2). Therefore, among the components in the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. Also, the overall operation of this embodiment is basically the same as that of the first embodiment.
A detailed description is omitted, and the following description focuses on the differences.

In the configuration in which the constituent lens 101 is vibrated only in one direction perpendicular to the optical axis OA as in the first and second embodiments, as shown in FIG. 3 and FIG. A portion where the pixel pattern and the BM pattern are not overlapped occurs in a direction perpendicular to the direction in which the lens 101 vibrates. In order to solve this problem, the projection lens 701c according to the present embodiment is configured such that the constituent lens 101 has the optical axis OA.
It is configured to be movable within a predetermined range in two directions, a vertical direction and a horizontal direction, which are perpendicular to. The actuator unit according to the present embodiment (hereinafter referred to by reference numeral 10 to distinguish it from the actuator unit 10 according to the first embodiment)
c) is a first vibrating means composed of a linear actuator that vibrates the constituent lens 101 in a vertical direction perpendicular to the optical axis OA, and vibrates the constituent lens 101 in a horizontal direction perpendicular to the optical axis OA. And two vibration means including a second vibration means comprising a linear actuator.

FIG. 5A is an enlarged view partially showing details of a projection image Ps (see FIG. 2) enlarged and projected on a screen by the projection lens 701c in the present embodiment. FIG. 5A shows a state in which the constituent lens 101 of the projection lens 701c is not misaligned with respect to the optical axis OA.
As shown by the solid line in FIG.
The pixel patterns 402 corresponding to the pixel openings in 09G and 709B correspond to the horizontal direction (the horizontal scanning direction of the image represented by the input video signal Sv) and the vertical direction (the input video signal Sv).
Are arranged regularly and two-dimensionally in the direction of vertical scanning of the image represented by. Further, the pattern 401 corresponding to the region between the pixel patterns 402 arranged as described above is the BM pattern corresponding to the black matrix in the liquid crystal panels 709R, 709G, and 709B.

In the present embodiment, the actuator 10c
Of the two vibration means included in the first vibration means,
The constituent lens 101 is vibrated so as to cause the constituent lens 101 to shift the optical axis in the vertical direction perpendicular to the optical axis OA, and the second vibration means causes the constituent lens 101 to move the optical axis in the left-right direction perpendicular to the optical axis OA. Constituent lens 10 so as to cause displacement
1 is vibrated. At this time, the first and second vibration means vibrate the constituent lens 101 at the same cycle as the field cycle of the input video signal Sv based on the vertical synchronization signal Vsync. Accordingly, the optical path from the projection lens 701c to the screen vibrates two-dimensionally in a plane perpendicular to the optical axis OA. In the present embodiment, by setting the timing of the oscillating operation between the first oscillating means and the second oscillating means in a predetermined relationship, the projection lens passes through each liquid crystal panel on which the liquid crystal panel display image P is displayed. The light passing through 701c moves downward in the vertical direction at a half field cycle, then moves rightward in the horizontal direction at a half field cycle, and then moves upward in the vertical direction at a half field cycle. Move,
By a series of operations returning to the original position in the next half field cycle, the optical path from the projection lens 701c to the screen moves in the above-described series of directions perpendicular to the optical axis OA, and correspondingly, the projected image Ps Move in the series of directions. As a result, as shown by a dotted line in FIG. 5A, in the projected image Ps, a part of each pixel pattern 402 and a part of the BM pattern 401 are superposed in both the vertical direction and the horizontal direction at the field period, To the human eye, the pixel opening appears to have spread in both the vertical and horizontal directions. For example, the luminance on the straight line AB in the projected image Ps (the luminance obtained by adding the luminance of each of the two fields) is as shown in FIG. Specifically, the luminance K2 of the portion of the BM pattern 401 that is superimposed on the pixel pattern 402 is one of the luminance K1 of the portion of the pixel pattern 402 that is not superimposed on the BM pattern 401.
/ 2. For this reason, the luminance step when the constituent lens 101 is vibrated is about の of the luminance step when the constituent lens 101 is not vibrated. Therefore, due to the vibration of the constituent lens 101 in the present embodiment, the vertical width 402V of each pixel pattern 402 appears to be pseudo-expanded, and the horizontal width 402H of each pixel pattern 402 also appears to be pseudo-expanded. Along with this, the vertical width 401V of the BM pattern 401 looks pseudo narrowed, and the horizontal width 401H of the BM pattern 401 looks pseudo narrow. As a result, the BM pattern 401 becomes difficult to see. In this manner, the problem that the pixel pattern and the BM pattern do not overlap in the direction perpendicular to the direction in which the constituent lens 101 vibrates in the first embodiment can be solved, and the BM pattern 401 becomes more visible. Can be difficult.

In the above embodiment, the vibration width of the component lens 101 is adjusted according to the width of the BM pattern which is a black matrix on the screen surface, and the projection lens is vibrated by the vibration of the component lens 101. It goes without saying that the lens is designed so that the performance of the 701c itself does not extremely deteriorate. here,
In order to prevent the adjacent pixel patterns 402 from overlapping due to vibration in the projected image Ps on the screen, the interval between the adjacent pixel patterns 402 in the vibration direction is 以下 or less (in the present embodiment, the amplitude of the vertical vibration is BM The vibration width of the constituent lens 101 is set such that the projection image Ps vibrates at an amplitude of 以下 or less of the pattern vertical width 401V and the amplitude of the vibration in the horizontal direction is 以下 or less of the BM pattern horizontal width 401H). Is preferred. In the above embodiment, the oscillation cycle of the constituent lens 101 is the same as the field cycle of the input video signal Sv, but the oscillation cycle may be shorter than the field cycle. The period may be longer than the field period as long as the period causes the projection image Ps to vibrate at a speed that cannot be recognized by the naked eye due to vibration.

As described above, according to the present embodiment, by vibrating the constituent lens 101 in both the vertical and horizontal directions, the pixel pattern and the BM pattern are perpendicular to the direction in which the constituent lens 101 vibrates. The problem that a non-overlapping portion occurs is solved, and each pixel pattern 40
2 appears to spread both up and down and left and right. As a result, the BM pattern (black matrix) becomes inconspicuous, so that when the input video signal Sv represents a moving image, it is possible to eliminate a situation in which a bad impression as if viewing the image through a screen door is given.

<Fourth Embodiment> Next, a liquid crystal projector which is a projection type image display device according to a fourth embodiment of the present invention will be described.

As described above, when the input video signal Sv represents a moving image, if the BM pattern is conspicuous in the projected image Ps, it gives a bad impression that the image is viewed through the screen. However, when the input video signal Sv represents a still image composed of character information often used for presentation like a video signal from a personal computer (personal computer) or the like, the BM pattern can be seen in the projected image Ps. But characters and the like are clearly visible. Therefore, in the present embodiment, as shown in FIG. 6, the switch unit 3 that turns on / off the operation of the actuator unit 10 that is a vibration unit that vibrates the constituent lens 101 forming the projection lens 701.
0, so that the BM pattern can be made difficult to see only when a moving image is displayed as the projection image Ps. The other components in the present embodiment are the same as those in the first embodiment, and thus the same reference numerals are given and the detailed description is omitted.

In the present embodiment, the switch unit 30
A vertical synchronization signal Vsync is inserted between the actuator unit 10 and the video circuit 20 and is supplied to the actuator unit 10.
Control the supply of That is, when the switch unit 30 is turned on, the vertical synchronization signal Vsync separated from the input video signal Sv is supplied to the actuator unit 10. When the switch unit 30 is turned off, the vertical synchronization signal Vsync is supplied to the actuator unit 10. Are grounded, and the supply of the vertical synchronization signal Vsync to the actuator unit 10 is stopped. Therefore, when the switch unit 30 is on, the actuator unit 10 vibrates the constituent lens 101 of the projection lens 701 based on the vertical synchronization signal Vsync,
This makes it difficult to see the BM pattern in the projected image Ps. On the other hand, when the switch section 30 is off, the actuator section 10 does not supply the vertical synchronization signal Vsync, so that the constituent lens 101 does not vibrate, and the constituent lens 101 is stopped on the optical axis OA. As a result, the BM pattern looks clear in the projection image Ps.

As described above, according to the present embodiment, since the switch section 30 is provided between the video circuit 20 and the actuator section 10, the image represented by the input video signal Sv, that is, the image projected on the screen is a moving image. It is possible to select whether to vibrate or stop the constituent lens 101 depending on whether it is a still image or a still image. Therefore, for example, when receiving the input video signal Sv from a personal computer or the like and projecting a still image composed of character information often used for presentation, the user turns off the switch unit 30 to project the projected image. In Ps, the BM pattern can be sharpened so that characters and the like can be clearly seen. On the other hand, when a signal from a television receiver, a video tape recorder, or the like, a computer graphic signal, or the like is received as an input video signal Sv and a moving image represented by these signals is to be projected, the switching unit 3
By turning on 0, it becomes possible to make the BM pattern less visible in the projected image Ps.

In the above-described embodiment, the switch is inserted between the actuator and the video circuit in the first embodiment. However, in the second or third embodiment, the actuator and the video are not connected. A configuration in which a switch section is inserted between the circuit and the circuit may be adopted. In these cases, the same effect can be obtained.

<Fifth Embodiment> Next, a liquid crystal projector which is a projection type image display device according to a fifth embodiment of the present invention will be described.

HDTV (High Definition Television:
High-definition images represented by interlaced scanning video signals (hereinafter referred to as "HD signals") of high-definition televisions)
As shown in FIG. 10, when an image is displayed by a liquid crystal projector using a liquid crystal panel of 480 pixels vertically, an image (pixel) of an odd field (FIG. 10A) and an image of an even field are placed on the same pixel in the liquid crystal panel. An image (pixel) (FIG. 10B) is displayed, and a projection image obtained by adding the images in the two fields is displayed on the screen (FIG. 10C). In this case, when the HD signal represents a black-and-white image, if the luminance is switched in any of the scanning lines in the black-and-white image, the projected image Ps
At the scanning line portions before and after the switching, it looks gray and blurred, and also when the HD signal represents a color image, the scanning line portion before and after the color switching in the projected image Ps The color appears to be blurred because it appears to be a mixed color. Therefore, when the amount of information of the input video signal as the signal source is larger than the number of display pixels of the liquid crystal panel in terms of the number of pixels, processing such as reducing the amount of information must be performed.

On the other hand, in the present embodiment, by utilizing the configuration of the first embodiment and the like, a high-definition image represented by an HD signal can be normally processed without processing the HD signal which is an input video signal. It can be displayed on a liquid crystal panel with the number of pixels.

The overall configuration of the projection type image display device according to this embodiment is basically the same as that of the first embodiment, and is as shown in FIG. The configuration of the projection lens in the present embodiment (hereinafter, denoted by reference numeral 701d to distinguish it from the projection lens 701 in the first embodiment) is basically the same as that in the first embodiment. This is the same as the projection lens 701 (see FIG. 2). Therefore, among the components in the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. In addition, the overall operation of the present embodiment is almost the same as that of the first embodiment, and thus detailed description is omitted, and the following description will focus on differences. Also, in the following, each of the liquid crystal panels 709R, 70
9G and 709B have 480 pixels in the vertical direction (vertical direction), that is, the vertical scanning direction, and the input video signal Sv is an interlaced scanning HD signal.

FIG. 7A is an enlarged view partially showing details of a projection image Ps (see FIG. 2) enlarged and projected on a screen by the projection lens 701d in the present embodiment. FIG. 7A shows a state in which the constituent lens 101 of the projection lens 701d is not misaligned with respect to the optical axis OA.
As shown by the solid line in FIG.
Pixel patterns 602 corresponding to the pixel openings in 09G and 709B correspond to the horizontal direction (the direction of horizontal scanning of the image represented by the input video signal Sv) and the vertical direction (the input video signal Sv
Are arranged regularly and two-dimensionally in the direction of vertical scanning of the image represented by. Pixel pattern 6 arranged in this way
A pattern 601 corresponding to a region between 02 is a BM pattern corresponding to a black matrix in the liquid crystal panels 709R, 709G, and 709B.

In the present embodiment, the constituent lens 101 is shifted vertically in the vertical direction perpendicular to the optical axis OA.
The actuator unit 10d vibrates the constituent lens 101 based on the vertical synchronization signal Vsync. At this time, the actuator unit 10d sets the pixel pitch in the vertical direction of the pixel opening in the liquid crystal panel (this corresponds to the pixel pattern pitch 603 in the projected image Ps shown in FIG. 7A).
The component lens 101 is vibrated so as to cause the component lens 101 to cause an axis shift corresponding to の of the above, and the field is switched at the same period as the field period of the input video signal Sv based on the vertical synchronization signal Vsync. The constituent lens 101 is vibrated in synchronism with. Thereby, the projected image P
In FIG. 7, for example, during the period of the odd field,
A pixel pattern 602 indicated by a solid line in FIG.
The pixel pattern shown by the dotted line in FIG. That is, the projection image Ps oscillates at the field period, and the projection image Ps of the odd field (FIG. 7B) and the projection image Ps of the even field (FIG. 7).
(C)) means the vertical pitch 603 of the pixel pattern.
, Ie, reference numeral 6 in FIG.
It is displayed on the screen shifted by the pitch indicated by 04. As a result, the projected image Ps is visually recognized by the human eye as a high-definition image in which the number of pixels in the vertical direction (vertical direction) is increased in a pseudo manner (FIG. 7D). Also, the projected image Ps
In the above, the pixel pattern 602 and the BM pattern 601 are superimposed in the field cycle, so that the black BM pattern (matrix) is not noticeable.

As described above, according to the present embodiment, half of the pixel pitch in the vertical direction of the pixel opening in the liquid crystal panel.
The component lens 101 vibrates in the field cycle so as to cause the component lens 101 to have an axis shift corresponding to the following. Thus, the projection image Ps vibrates in the field cycle with a vibration width of の of the pixel pattern pitch (the amplitude is 1/4 of the pixel pattern pitch). As a result, a high-definition image can be displayed on a liquid crystal panel having a normal number of pixels, that is, an inexpensive liquid crystal panel, without performing processing such as reducing the amount of information included in the input video signal Sv. Further, similarly to the first embodiment, since the BM pattern (black matrix) becomes inconspicuous, when the input video signal Sv represents a moving image, it gives almost a bad impression as if the user were looking through the screen. Can be resolved.

In the present embodiment, the amount of optical axis shift is set to an amount corresponding to の of the pixel pitch.
The shift amount of the optical axis may be determined so that the display of the even field is superimposed on the M pattern. Ideally, the projection lens 70 is shifted such that the optical axis is shifted by the vertical opening width of the pixel.
It is preferable to vibrate at least one lens in 1d.
However, it goes without saying that the lens is designed so that the performance of the projection lens itself does not extremely deteriorate due to the vibration of the constituent lens 101.

<Modification> In each of the above embodiments, the projection image Ps is vibrated by vibrating the constituent lens 101 included in the projection lens in a direction perpendicular to the optical axis OA. The liquid crystal panel may be caused to vibrate at a predetermined amplitude in a direction parallel to the plane on which the pixel openings are arranged. In particular, in a projection type image display apparatus using a single liquid crystal panel as a light valve, such a configuration is also realistic. In this case, an actuator unit that vibrates the liquid crystal panel in the above-described direction is provided instead of the actuator unit 10 that vibrates the constituent lens 101. At that time, in order to avoid overlapping of adjacent pixel patterns in the projected image Ps on the screen due to vibration, the distance between adjacent pixel patterns in the vibration direction (B in the vibration direction)
It is preferable to set the oscillation width of the liquid crystal panel so that the projection image Ps oscillates at an amplitude equal to or less than の of the width of the M pattern.

In each of the embodiments described above, one component lens 101 included in the projection lens is vibrated in a direction perpendicular to the optical axis OA. The projection image Ps may be vibrated by vibrating in the direction perpendicular to the axis OA. Also in this case, the same effect can be obtained by appropriately setting the vibration period and the vibration width in the same manner as described above.

[Brief description of the drawings]

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

FIG. 2 is a conceptual diagram showing the configuration and principle of a projection lens in the projection type image display device according to the first embodiment.

FIG. 3 is a diagram for explaining the operation principle in the first embodiment.

FIG. 4 is a diagram for explaining an operation principle according to the second embodiment of the present invention.

FIG. 5 is a diagram for explaining an operation principle according to a third embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a main part including a switch unit for turning on / off a vibration unit according to a fourth embodiment of the present invention.

FIG. 7 is a diagram for explaining an operation principle according to a fifth embodiment of the present invention.

FIG. 8 is a conceptual diagram showing the configuration and principle of a projection lens in a liquid crystal projector that is a conventional projection type image display device.

9A is a detailed view of a projected image projected on a screen by the conventional liquid crystal projector, and FIG. 9B is a view showing luminance on a straight line AB in the projected image.

FIG. 10 is a diagram showing an example of a display on a liquid crystal panel of a high-definition image having a large amount of information from a signal source.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Actuator part 20 ... Video circuit 30 ... Switch part 101 ... Constituent lens 201,301,401,601 ... BM pattern 202,302,402,602 ... Pixel pattern 201V, 301V, 401V, 601V ... BM pattern vertical width 201H, 301H, 401H, 601H ... BM pattern width 202V, 302V, 402V, 602V ... pixel pattern length 202H, 302H, 402H, 602H ... pixel pattern width 603 ... pixel pattern pitch 701 ... projection lens 702 ... light source 703 ... reflector 704a, 704b: Lens array for illumination 705a to 705d: Total reflection mirror 706B: Blue transmission dichroic mirror 706G: Green reflection dichroic mirror 709B: Liquid crystal panel for blue 709G: Green Crystal panel 709R Red liquid crystal panel 710 Color synthesis prism Lw Light from light source Lb, Lbm Blue light Lg, Lgm Green light Lr, Lrm Red light P Liquid crystal panel display image Ps (on screen) Image Sv: input video signal Sb: blue video signal Sg: green video signal Sr: red video signal Vsync: vertical synchronization signal

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/74 H04N 5/74 KA 9/30 9/30 9/31 9/31 CF term (reference 2H088 EA14 HA06 HA08 HA13 HA21 HA24 HA28 MA01 MA20 5C058 AA06 BA25 BA35 BB23 EA12 EA26 5C060 BA04 BA09 BC05 HC01 HC24 HC25 JA23 JB06 5G435 AA01 BB17 CC12 DD02 DD05 EE30 GG02 GG04 GG08 LL08 LL08LL08

Claims (11)

[Claims] 1. A projection-type image display device for displaying an image represented by an input signal by spatially modulating light emitted from a light source based on the input signal and projecting the modulated light on a screen. A modulation device comprising a dot matrix light valve having a plurality of pixel openings arranged two-dimensionally in a horizontal direction and a horizontal direction, and spatially modulating a light flux of light emitted from the light source according to the input signal. Means, a lens group arranged on a predetermined optical axis, and a projection optical system for enlarging and projecting a light beam modulated by the modulation means on the screen; and a lens group constituting the projection optical system. Vibrating means for vibrating the at least one lens at a predetermined amplitude so as to cause the at least one lens included in the at least one lens to shift the optical axis in a direction perpendicular to the optical axis. A projection type image display device characterized by the following. 2. The method according to claim 1, wherein the vibrating means is 以下 or less of an interval between pixel patterns adjacent to each other in a vibration direction among pixel patterns representing the pixel openings in a projection image displayed on the screen by the projection optical system. The projection type image display device according to claim 1, wherein the at least one lens is vibrated so that the projection image vibrates at an amplitude of (a). 3. The vibrating means causes the at least one lens to shift an optical axis in one or both of a vertical direction and a horizontal direction perpendicular to the optical axis.
The projection-type image display device according to claim 1, wherein the at least one lens is vibrated. 4. The apparatus according to claim 1, wherein the vibration unit vibrates the at least one lens so as to cause the at least one lens to shift an optical axis in an oblique direction perpendicular to the optical axis. Item 2. A projection type image display device according to item 1. 5. The projection type image display according to claim 1, further comprising an ON / OFF switching unit for setting whether to operate or stop the vibration unit. apparatus. 6. The input signal is a video signal of an interlaced scanning system in which each frame includes an even field and an odd field. The vibrating means is configured to generate a field of the input signal based on a synchronization signal of the input signal. The projection type image display device according to any one of claims 1 to 4, wherein the at least one lens is vibrated at the same cycle as a cycle. 7. The input signal is a video signal of an interlaced scanning system in which each frame includes an even field and an odd field, and the vibrating means includes a vertical pitch of the pixel opening in the at least one lens. The at least one lens vibrates in synchronization with the switching of the field at the same cycle as the field cycle of the input signal based on the synchronization signal of the input signal so as to cause an optical axis shift corresponding to １ ／ of the lens. The projection type image display device according to claim 1, wherein 8. The light from the light source is divided into red, blue and green light.
A color separation optical system that separates the three colors of light; and a color synthesis optical system that synthesizes the three colors of light. The modulation unit converts the light beams of the three colors of light obtained by the color separation optical system into A dot matrix light valve that modulates the light in accordance with a video signal, wherein the color synthesizing unit generates the synthesized light by synthesizing the three colors of light whose luminous flux has been modulated by the modulating unit; The projection type image display device according to any one of claims 1 to 7, wherein the combined light projects the combined light onto the screen in an enlarged manner. 9. The projection type image display device according to claim 1, wherein said dot matrix type light valve in said modulating means is a liquid crystal panel. 10. A projection-type image display apparatus for displaying an image represented by an input signal by spatially modulating light emitted from a light source based on an input signal and projecting the modulated light on a screen. A modulation device comprising a dot matrix light valve having a plurality of pixel openings arranged two-dimensionally in a horizontal direction and a horizontal direction, and spatially modulating a light flux of light emitted from the light source according to the input signal. Means, a projection optical system for enlarging and projecting the light beam modulated by the modulation means on the screen, and vibrating the light valve at a predetermined amplitude in a direction parallel to a plane on which the pixel openings are arranged. And a vibrating means. 11. The projection-type image according to claim 10, wherein the vibration unit vibrates the light valve with an amplitude equal to or less than の of a distance between the pixel openings adjacent to each other in a vibration direction. Display device.