JPH0759036A - Projector device - Google Patents

Abstract

PURPOSE: To simplify and miniaturize the projector and to obtain a high luminance for a displayed image by making an image center of video data in matching with a display center of a video source and controlling a zoom ratio in response to the system of the video data. CONSTITUTION: A received TV signal S20 of the NTSC or PAL system is fed to a signal processing circuit, where the signal is converted into a TV signal S21 of the RGB system and it is fed to a video deflection phase control circuit 42. Furthermore, the circuit 41 generates information S22 denoting a type of the TV system and synchronizing signals based on a video signal and synchronizing signals in the signal S20 and gives the information S22 to a display control circuit 43. Furthermore, the circuit 42 replaces the synchronizing signals with proper synchronizing signals so that a center of a video image is in matching with a center of a mirror light bulb in response to a polarized phase control signal S23 based on the arithmetic result of the circuit 43 and gives a resulting TV signal S24 to an A/D converter circuit 44. The circuit 44 applies A/D conversion to the TV signal S24 based on a clock signal S25 in response to the received signal S22 and gives obtained video data S26 to a re-format circuit.

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. Field of Industrial Application Conventional Technology Problems to be Solved by the Invention Means for Solving the Problems (FIGS. 6 and 7) Action (FIGS. 6 and 7) Example (1) Overall Configuration of Projector Device (FIG. 1) (FIG. 5) (2) Projector device of the embodiment (FIGS. 6 and 7) (3) Other embodiment Effect of the invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projector device, and is suitable for application to, for example, a device for projecting a color image.

[0003]

2. Description of the Related Art Conventionally, as a projector device of this type, there is a projector device which individually displays red, green and blue components of image data on three CRTs (cathode ray tubes).
On the front surface of this projection type three-tube projector device, three CRTs in which red, green, and blue color filters and projection lenses are sequentially arranged on the image projection surface side are arranged.

The CRT is designed so that the red, green and blue components of the image data are directly projected onto the screen separately at the time of projection, whereby the projected light of the red, green and blue components projected from each CRT on the screen is projected. One image is formed by combining them, and a color image is projected as a whole.

Further, instead of the projection type three-tube type projector device, there is a reflection type three-tube type projector device in which three CRTs are arranged inside the box. In the case of this projector device, an optical path similar to that of the projection-type three-tube projector device is reflected and bent by a mirror arranged inside the box, and projection light is irradiated from the back surface to a frosted glass-like semitransparent screen.

As a result, each CR is displayed on the screen.
The projection lights of the red, green, and blue components emitted from T are combined to form one image, and a color image is projected as a whole. In the case of this reflection type three-tube type projector device, by bending the optical path to reduce the size and integrally forming the screen itself, it is possible to realize a smaller size projector device than the projection type three-tube type projector device. The usability of can be improved.

[0007]

However, in the projection type three-tube projector device or the reflection type three-tube projector device having such a configuration, a CRT is used as a light source and an image projected from the CRT is enlarged and displayed on the screen. Therefore, there is a problem in that it is inevitable that the entire device becomes large, and it is difficult to increase the brightness of the display image.

In order to solve such a problem, three liquid crystal panel plates are used as an image source in place of the CRT, each of the liquid crystal panel plates displays red, green and blue components, and one surface of the liquid crystal panel plate is displayed. There is a so-called liquid crystal projector device which irradiates light from the side and forms an image of the transmitted light on a screen through red, green and blue color filters, respectively.

In the case of this liquid crystal projector device, the entire device can be remarkably miniaturized as compared with a projector device which uses a CRT because a liquid crystal panel is used, but the liquid crystal panel plate itself has a low light transmittance and displays a display image. In terms of achieving high brightness, it has not been practically sufficient.

By the way, as a display system, a minute mirror surface element is arranged in a plane according to a pixel, and a mirror surface deflection type optical modulator utilizing the reflection of each mirror surface element (hereinafter referred to as a mirror light valve) is used. Those have been proposed (JP-A-60-179781, JP-A-3-40693, and JP-A-3-174112).

If a projector device for magnifying and projecting a color image can be formed by using this mirror light valve as an image source, the structure of the entire device can be simplified to the same scale as the liquid crystal projector device and can be downsized.
Further, it is considered that the display image can be significantly increased in brightness by improving the utilization efficiency of the light source as compared with the liquid crystal.

The present invention has been made in view of the above points, and it is an object of the present invention to propose a projector device which can be simply and miniaturized and which can enhance the brightness of a displayed image and remarkably improve its usefulness.

[0013]

In order to solve such a problem, in the present invention, a predetermined image source 2R, 2G, 2B is driven by image data S20, and an image displayed on the image source 2R-2B is displayed. In the projector device 1 for enlarging and projecting on the display surface, the image center of the video data S20 is focused on the video source 2R.
Video data processing means 4 to match the display center of 2B
1, 42, 43, and zoom lens means 11 for enlarging and projecting the images of the image sources 2R to 2B at a predetermined zoom ratio,
Even when video data S20 of various types is input,
The zoom ratio of the zoom lens means 11 is controlled so that the screen size of the image display surface is kept constant.

[0014]

By matching the image center of the image data S20 with the display center of the image source, and controlling the zoom ratio of the zoom lens means for enlarging and projecting the image of the image source according to the type of the image data. With a simple configuration and a simple operation of only adjusting the zoom ratio, various image data can be enlarged and projected on the image display surface with the same screen size while minimizing the deterioration of the image quality.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

(1) Overall Configuration of Projector Device In FIG. 1, reference numeral 1 indicates three mirror light valves 2 corresponding to respective image data of red, green and blue as a whole.
1 shows a projector device using R, 2G, 2B. 2 and 3 in which parts corresponding to those in FIG.
As shown in FIG. 3, the projection light L1 emitted from the high-intensity white light source 3 is converted into parallel light through a condenser lens 4 while unnecessary UV rays are removed by a UV filter (not shown). The dichroic mirrors 6R and 6 for separation while being bent by the reflection mirror 5 of No. 1
It is incident on G and 6B.

Separation dichroic mirrors 6R, 6G,
6B is a procession light L2 consisting of white light in red,
The green and blue lights LR, LG and LB are separated. This red,
The green and blue lights LR, LG, LB are bent obliquely upward by the second reflecting mirrors 8R, 8G, 8B through the beam shaping cylindrical lenses 7R, 7G, 7B, respectively, and reflected by the mirror light valves 2R, 2G, 2B. The surface is illuminated.

The mirror light valves 2R, 2G and 2B are
According to the pixel array of video data (for example, 768 x 576 pixels), a plurality of minute mirror surface elements each having a size of, for example, 17 [μm] square are arrayed, and thereby, a half is formed.
A reflective surface having a size similar to that of an inch CCD (solid-state image sensor) is formed. The micro mirror surface element is arranged corresponding to each memory cell of the frame memory according to the array of pixels of the video data, and the tilt state of the corresponding micro mirror surface element is changed individually according to the state of each memory cell. Has been done.

Practically, each micro mirror element tilts by + 10 ° as shown in FIG. 4 (A) when the memory cell is in the on state, that is, effective as a pixel with respect to the neutral state, and conversely, when the memory cell is in the off state, When it is invalid as a pixel, it is tilted by −10 ° as shown in FIG.
As a result, the reflected light reflected by the mirror surface with respect to the incident light is
It is switched so as to have an optical path difference of 20 ° between the effective reflected light necessary for forming an image and the invalid reflected light which is not effective.

In the case of the projector device 1, the image data for one frame of red, green, and blue is set in the frame memories corresponding to the mirror light valves 2R, 2G, and 2B, respectively, so that effective reflected light is obtained. Red,
Green and blue image lights are formed. The red, green and blue image lights are respectively associated with relay lenses 9R, 9G and 9B.
Through dichroic mirrors for synthesis 10R, 10G,
It is guided to 10B and is combined as a color image light, and this is enlarged and projected through a projection lens 11 having a zoom lens structure onto a screen (not shown) arranged outside the projector device 1 at a distance.

In the case of the projector device 1, the high-brightness white light source 3, the condenser lens 4, the first reflecting mirror 5, the separating dichroic mirrors 6R to 6B, and the cylindrical lenses 7R to 7B are passed through the second reflecting mirror 8R. ~
The optical axis of the optical system of the projection lights L1 and L2 reaching 8B, the relay lenses 9R to 9B reflected by the mirror light valves 2R to 2B, and the dichroic mirror for synthesis 10R.
˜10B, the optical axis of the effective reflected light reaching the projection lens 11 is displaced by a predetermined height, thereby preventing interference between the projection light and the effective reflected light and the invalid reflected light. It is designed to get you.

Furthermore, in the projector device 1, the beam shape of the projection light is shaped by the cylindrical lenses 7R to 7B, whereby the second reflecting mirror 8 is formed.
Even if the light is reflected obliquely upward by R to 8B, the reflecting surfaces of the mirror light valves 2R to 2B can be illuminated with a uniform illuminance.

Here, in the projector device 1, the optical device shown in FIG.
The circuit portion shown in FIG. 5 in which the same reference numerals are assigned to the corresponding portions is provided. In this projector device 1, as a video signal to be displayed, a video signal S1 input as an RGB signal from a video device or a V signal from a personal computer or the like is used.
The video signal S2 sent corresponding to GA (video graphics arrey) and the video signal S3 of VGA pattern can be selected.

These video signals S1, S2, S3 are
Each of them is input to the video select circuit 21 and selected, and the resulting video signal S4 is converted into a digital video signal S5 by the analog-digital conversion circuit 22,
It is input to the gamma correction circuit 23. The test pattern signal S6 generated by the test pattern generation circuit 24 is input to the gamma correction circuit 23 as needed. As a result, the gamma correction circuit 23 performs gamma correction on the digital video signal S5 or the test pattern signal S6 according to the set gamma correction parameter S7, and sends the resulting digital video signal S8 to the reformatting circuit 25.

The re-format circuit 25 inputs the RGB video signal S1 and the VGA video signals S2 and S.
The digital video signal S8 corresponding to 3 is, for example, mirror light valves 2R to 2B composed of 768 pixels × 576 lines.
The digital video signal S9 of red, green, and blue components obtained by performing re-formatting according to the arrangement of the mirror surface elements
R, S9B and S9G are sent to the corresponding frame memories 26R, 26G and 26B, respectively.

The frame memories 26R to 26B correspond to the mirror light valves 2R to 2B, respectively, and in accordance with the control signal S10 input from the timing control circuit 27, the frame memories 26R to 2B are sequentially frame by frame.
The contents of 6B are written in the mirror light valves 2R to 2B, whereby red, green and blue image lights are formed as effective reflected lights.

In the case of this projector device 1, the timing control circuit 27 uses the input video signals S1 to S3.
Using the system clock S12 generated by the clock generation circuit 28 in accordance with the phase control signal S11 based on the above, the frame memories 26R to 26B and the mirror light valve 2R are used.
The control signal S10 for controlling .about.2B is generated.

Further, in the projector device 1, when the power switch (not shown) is turned on, the AC power S13 is supplied to the power supply circuit 30 and the lamp drive circuit 31. Of these, the power supply circuit 30 supplies a predetermined DC power S14 to each circuit section to start the operation of the projector device 1. Further, the lamp drive circuit 31 drives the high-intensity white light source 3 to be turned on, so that the white light source 3 emits the projection light L1.

According to the configuration of the projector device 1,
Mirror light valves 2R, 2G, and 2B corresponding to red, green, and blue are used as image sources, and the mirror light valves 2R to 2B are driven by red, green, and blue video signals, respectively, and white light is emitted. By irradiating red, green, and blue projection lights that are separated into colors, and synthesizing the effective reflected lights for enlarged projection, it is possible to compare with a conventional projector using a CRT. Projector device 1 with significantly smaller size, lighter weight and simple structure
Can be realized.

Further, since the mirror light valves 2R-2B are designed to reflect the projection light,
As compared with the liquid crystal projector device, the utilization efficiency of light can be remarkably improved, and thus it is possible to realize the projector device which can be reduced in size and weight and which can increase the brightness of the displayed image.

(2) Projector device of this embodiment Here, in the projector device 1 of this embodiment, the NTSC
It is designed so that the television signal of the PAL system or the PAL system can be enlarged and projected on the screen. That is, the television signal S20 is processed by the television signal display section 40 shown in FIG. 6, and the resulting video data S26 is supplied to the ref-format circuit 25 of the circuit section of the projector device 1 described above with reference to FIG.

In practice, in the television signal display section 40, the input NTSC or PAL television signal S20 is supplied to the signal processing circuit 41 to read the R signal.
It is converted into a GB type television signal S21, and this is supplied to the image deflection phase control circuit 42. Further, the signal processing circuit 41 creates the information S22 of the synchronizing signal including the type of the television system and the horizontal and vertical frequencies from the video signal and the synchronizing signal in the television signal S20, and the information S22 is generated by the central processing element and the storage element. Display control circuit 43 formed
Supply to.

Further, the image deflection phase control circuit 42 has a deflection phase control signal S23 based on the calculation result of the display control circuit 43.
Depending on the, the center of the image is the mirror light valve 2R-2G
The sync signal is changed so that it coincides with the center of, and the television signal S24 obtained as a result is supplied to the analog-digital conversion circuit 44. Analog-digital conversion circuit 44
Is the information S of the synchronization signal input from the display control circuit 43.
The television signal S24 is converted into a digital signal on the basis of the clock signal S25 corresponding to No. 22, and the resulting video data S26 is sent to the ref-format circuit 25.

As a result, the image data S26 is once stored in the frame memories 26R, 26G and 26B and supplied to the mirror light valves 2R to 2B.
The television signal S20 of SC system or PAL system is enlarged and projected on the screen. In the television signal display section 40, the zoom ratio of the projection lens 11 is controlled by the zoom control signal S28 sent from the display control circuit 43 in accordance with the NTSC or PAL television signal S20. The system and PAL system television signals S20 can be projected on the screen with almost the same screen size.

For example, in the case of a television signal of NTSC system or PAL system, the number of scanning lines is 525,
There are 625 lines, and there is a difference of 100 lines. In the case of a projector device using a CRT, a deflection system is used to correct the screen size so that, for example, the PAL system television screen has a screen size that matches the NTSC system television signal. When the signal is displayed,
As the number of scanning lines increases, the spacing between the scanning lines becomes narrower, and in the worst case, the scanning lines partially overlap with each other, resulting in poor image quality.

On the contrary, when an NTSC television signal is displayed with a screen size adapted to the PAL television signal, the interval between the scanning lines is increased due to the increased number of scanning lines, and The screen becomes rough with black streaks in between and the image quality deteriorates. A similar problem exists in a projector device using an LCD, but the number of pixels of the LCD panel is generally determined on the basis of the NTSC system television signal, and when displaying a PAL system television signal, it is simple. If the information for 100 scanning lines is not thinned out,
There is a problem that it cannot be displayed on the CD panel.

Further, this problem is caused by VGA (video graphi
The same phenomenon occurs when displaying NTSC or PAL television signals with the mirror light valves 2R to 2B in which microscopic mirror elements having the number of pixels according to the cs arrey) standard are arranged. That is, the mirror light valves 2R to 2B
Since the number of scanning lines of the NTSC system or PAL system television signal is smaller than the number of mirror surface elements, the screen becomes rough with black stripes between the scanning lines and the image quality deteriorates.

In the case of this embodiment, regarding the television signals of the systems in which the number of scanning lines and the number of pixels of one scanning line are different, the image deflection phase control circuit 42 first deflects the image deflection phase by the center CNT of the image. Change the sync signal so that it becomes the center of. Subsequently, as a result, as shown in FIG. 7, the difference in screen size obtained on the screen is controlled by controlling the zoom ratio of the projection lens 11 according to the system of the television signal so that the NTSC can be performed without deterioration of image quality.
The television signal S20 of the PAL system or the PAL system is displayed on the screen with almost the same screen size.

According to the above configuration, the television signal S
The image center of 20 is aligned with the display center of the mirror light valves 2R-2B, and the projection lens 11
Since the zoom ratio of the TV is controlled according to the system of the television signal S20, the deterioration of the image quality can be minimized by a simple configuration and a simple operation of only adjusting the zoom ratio. It is possible to realize the projector device 1 capable of enlarging and projecting the jeonge signal on the screen with the same screen size, simple and downsizing, and increasing the brightness of the displayed image and remarkably improving the usefulness.

(3) Other Embodiments In the above-mentioned embodiments, the mirror-deflecting optical modulator is used as a mirror-deflecting optical modulator according to the arrangement of pixels of image data on the reflecting surface.
The case where the array of 768 × 576 micro-mirror elements is used has been described, but the array of micro-mirror elements is not limited to this, and various selections can be made, for example, in accordance with NTSC or PAL television signals. Further, the arrangement is not limited to the two-dimensional arrangement, and the minute mirror surface elements may be arranged one-dimensionally and the projection light may be scanned to form an image.

In the above embodiment, the specular deflection type optical modulators driven according to the red, green and blue images are irradiated with red, green and blue projection light, respectively, and their effective reflection is performed. Although the case where light is combined and enlarged is described, instead of this, a single specular deflection type optical modulator is sequentially driven in time division according to red, green and blue images,
A projector that combines red, green, and blue projection light in a time-division manner in synchronization with this, or a combination of a mirror-deflecting light modulator that projects images of two or more colors. It may be applied to a device or the like.

Further, in the above-mentioned embodiment, the case where the zoom ratio of the projection lens is automatically controlled according to the system of the inputted television signal has been described, but the present invention is not limited to this. The screen size on the screen may be made constant by manually adjusting the zoom ratio of the projection lens.

Further, in the above-mentioned embodiment, the case where the present invention is applied to the projector device using the mirror-deflecting optical modulator as the image source has been described, but the image source is not limited to the mirror-deflecting optical modulator. Even when applied to a projector device using a CRT or LCD, the same effects as those of the above-described embodiment can be realized.

[0044]

As described above, according to the present invention, the image center of the image data is made to coincide with the display center of the image source, and
By controlling the zoom ratio of the zoom lens means for enlarging and projecting the image of the image source according to the method of the image data, deterioration of the image quality can be achieved by a simple configuration and a simple operation of only adjusting the zoom ratio. A projector device that can minimize and project various video data with the same screen size on the video display surface, thus simplifying and downsizing the display video and increasing the brightness significantly it can.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing the overall configuration of a projector device using a mirror-polarized light modulator.

FIG. 2 is a schematic plan view for explaining an optical system of the projector device of FIG.

3 is a schematic rear view for explaining an optical system of the projector device of FIG. 1. FIG.

FIG. 4 is a schematic diagram for explaining the operation of the mirror surface element of the mirror surface deflection type optical modulator.

5 is a block diagram showing a circuit configuration of the projector device of FIG. 1. FIG.

FIG. 6 is a block diagram showing a television signal display section in the projector device of the embodiment.

FIG. 7 is a schematic diagram for explaining a difference in screen size due to various television signals.

[Explanation of reference symbols] 1 ... Projector device, 2 ... Mirror light valve,
3 ... High brightness white light source, 4 ... Condenser lens, 5 ...
... 1st reflection mirror, 6 ... separation dichroic mirror, 7 ... beam shaping cylindrical lens, 8 ...
Second reflection mirror, 9 ... Relay lens, 10 ... Synthesis dichroic mirror, 11 ... Projection lens, 21 ... Video select circuit, 22 ... Analog-digital conversion circuit, 23 ... Gamma correction circuit , 24 ……
Test pattern generation circuit, 25 ... Re-format circuit, 26 ... Frame memory, 27 ... Timing control circuit, 28 ... Clock generation circuit, 30 ... Power supply circuit, 31 ... Lamp drive circuit, 40 ... Television Signal display unit, 41 ... Signal processing circuit, 42 ... Image deflection phase control circuit, 43 ... Display control circuit, 44 ... Analog-digital conversion circuit, 45 ... Zoom drive circuit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Fudo, Adult 6-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation

Claims (2)

[Claims] 1. A projector device for driving a predetermined video source with video data and enlarging and projecting a video image projected on the video source onto a video display surface, wherein the image center of the video data is the display center of the video source. And a zoom lens means for enlarging and projecting the image of the image source at a predetermined zoom ratio, and even when the image data of various types is input, the zoom lens means A projector device characterized in that the zoom ratio is controlled so that the screen size of the image display surface is kept constant. 2. The image source irradiates illumination light to a specular deflection type optical modulator having a plurality of minute specular surface elements arranged in accordance with pixels of the image data, and at the same time, the specular deflection type optical modulator is provided. 2. The projector device according to claim 1, wherein the projector device is characterized in that the reflected light is modulated by the image data and is effective reflected light of the specular deflection type optical modulator according to the image data.