JP4532778B2 - Optical scanning apparatus and optical scanning method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical scanning device and an optical scanning method configured as a projection display device, an image forming device, and the like, and in particular, a resonance-type first galvanometer mirror (resonance frequency is very small) that scans a light beam in a scanning line direction. Resonating with a simple drive signal and oscillating at high speed. Once it moves, it moves continuously and the angle cannot be controlled by the drive signal.) And the light beam is scanned in a direction perpendicular to the scanning line direction. A second galvanometer mirror (which may be a resonant galvanometer mirror, but is usually an oscillating single-sided mirror whose angle can be controlled by a drive signal), and scans the light beam in two dimensions to display an image. The present invention relates to a projection display device and a projection display method to be formed. In this specification, scanning in the scanning line direction is sometimes referred to as horizontal scanning, and scanning in the direction perpendicular to the scanning line direction is sometimes referred to as vertical scanning. However, the scanning line direction may be vertical. is there.
[0002]
[Prior art]
As one of the projection display devices, a laser display that forms an image by two-dimensionally scanning a light beam is known. FIG. 7 shows the configuration. The dichroic mirror 704 (reflects the red beam and deflects its optical axis at right angles) and the dichroic mirror 705 (reflects the green beam and orthogonally reflects its optical axis) from the red laser 701, green laser 702, and blue laser 703. Dichroic mirror 706 (reflects the blue beam and deflects its optical axis at a right angle but transmits the red and green beams and travels straight). Then, the color synthesis beam is horizontally scanned by a polygon mirror 707 rotating at a constant speed in one direction and vertically scanned by a galvanometer mirror 708. The scanned light beam is imaged on the screen 507 by the f-θ lens 506. Gas lasers are used as the lasers 701, 702, and 703, and light intensity modulators 709, 710, and 711 are used for modulation based on image information of light beams from the lasers. In FIG. 7, shaded areas indicate the state of light beam scanning.
[0003]
In this example, the scanning method of the light beam is unidirectional scanning for both horizontal scanning and vertical scanning, but several proposals have been made according to the scanning device. Two methods devised for an apparatus using a galvanometer mirror instead of a polygon mirror for horizontal scanning will be described below.
[0004]
Japanese Patent No. 2724016 “Display Device” makes it possible to drive a horizontal scanning galvanometer mirror with a symmetrical triangular wave by performing reciprocating drawing with light beams in horizontal scanning, and a high-speed saw that places a load on the driving system. Driving with waves (the driving time is applied because the blanking period is very short) is avoided. Further, the apparatus of this patent makes the horizontal scanning completely horizontal by making the vertical scanning step scanning between the horizontal scanning lines.
[0005]
Japanese Patent No. 2988457, “Display Device Driving Device and Method”, performs horizontal scanning of video information in the return pass period relative to video information in the forward pass period in order to draw both the forward and backward strokes in the vertical scan. The order is reversed in line units. The horizontal scanning direction is one direction during the same vertical scanning period.
[0006]
[Problems to be solved by the invention]
By the way, in the XGA (eXtended Graphics Array) which is the main display resolution at present, the number of horizontal pixels is 1024 and the number of vertical pixels is 768. Therefore, if the frame frequency of the video is 60 Hz, the horizontal scanning time is 21.7 μs (10 ⁶ / (768 × 60) μs) for reciprocal drawing.
[0007]
Consider the application of Japanese Patent No. 2724016 to a display device of this standard. For scanning in this horizontal scanning time, it is assumed that a resonant galvanometer mirror is used. A part of the scanning time of 21.7 μs is used for the step scanning time of the vertical scanning. Even if it is 20%, it is 43.4 μs, which is a step scanning time that is difficult to realize with an existing galvanometer capable of step scanning.
[0008]
The method of Japanese Patent No. 2988457 is applicable to the display device of the above standard, but in the same period, the forward scanning of the vertical scanning and the horizontal scanning of the returning scanning are unidirectional scanning. For this reason, the return scanning period (return line period) is not used for drawing, and the non-drawing time becomes 50% or more, and the screen brightness decreases.
[0009]
An object of the present invention is to provide an optical scanning device and an optical scanning method which are configured as a projection display device which solves such problems and realizes improvement of screen luminance and reduction of luminance unevenness.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, an optical scanning device of the present invention includes a first resonant galvanometer mirror that scans a light beam in the scanning line direction, and a second that scans the light beam in a direction perpendicular to the scanning line direction. A galvanometer mirror that scans the light beam from the light source two-dimensionally to form an image on the irradiated object, and includes image information for each pixel in the scanning line and each scanning line in the screen. By the rearrangement means, the order of the image information is reversed in units of pixels in the scanning line in the forward pass period and the return pass period of the first galvanomirror, and the second galvanomirror scan reversing the order of the image information in each scanning line on the screen in the forward path period and return period, the drive signal based rather the light source to the reordered images information, from the light source to suit the scan state and timing The light beam of It is configured as being configured so as to perform the drawing by the optical beam modulated with reciprocal scanning in the first galvanometer mirror in the forward period and return period of the second galvanometer mirror on the irradiated body, one screen scanning Depending on whether the number of lines is an even number or an odd number, the driving signal of the light source synchronized with the scanning of the first galvanometer mirror between the round trip period and the return path period of the second galvanometer mirror When the number of scanning lines is odd, the generation timing is an odd multiple of a half cycle of the scanning frequency of the first galvanomirror, and when the number of scanning lines is even, the scanning frequency of the first galvanomirror is A blanking period is provided with a delay of an even multiple of a half cycle .
[0011]
Since drawing is performed on the irradiated object by the light beam in the reciprocating scanning of the first galvanometer mirror, the non-drawing time is reduced to improve the luminance of the irradiated object such as a screen, and the forward period of the second galvanometer mirror Since the drawing is performed on the irradiated object during the return pass period, the luminance unevenness on the irradiated object such as a screen can be reduced.
[0012]
The optical scanning device is typically configured as a projection display device that scans a light beam two-dimensionally to form an image on a projection target.
[0013]
Based on the above basic configuration, the following more specific modes are possible.
The number of scanning lines of one screen is an even number, and the first scanning direction of the first galvanometer mirror in the forward pass period and the return pass period of the second galvanometer mirror is reverse. This can be applied to a monitor signal of a computer having an even number of scanning lines on one screen.
[0014]
In addition, the number of scanning lines on one screen is an odd number, and the first scanning direction of the first galvanometer mirror is the same in the forward period and the return period of the second galvanometer mirror. This can be applied to a television signal in which the number of scanning lines on one screen is an odd number.
[0015]
Typically, the resonance type first galvanometer mirror is driven by a drive signal of a sine wave or pulse wave having a resonance frequency of the mirror. On the other hand, the second galvanometer mirror is driven by a symmetrical triangular wave drive signal. In such a case, since the symmetrical triangular wave that is the driving signal of the second galvanometer mirror is dull at the apex portion, horizontal scanning is repeated at substantially the same position at the end portion in the vertical direction. Therefore, by appropriately providing a blanking period using such a period, the relationship between the scanning direction of the first galvanomirror at the start of the second galvanomirror and the return period can be controlled.
[0016]
A semiconductor light emitting device such as a semiconductor laser or a light emitting diode is used as a light beam light source, and the semiconductor light emitting device is directly modulated and driven based on the rearranged image information, or a semiconductor is manufactured as the first galvanometer mirror. If a micromirror manufactured by a process is used, a projection display device or the like can be reduced in size and cost can be further reduced.
[0017]
A wireless interface circuit for inputting a video signal, a video signal decoding means for decoding a video signal compressed and encoded for transmission, and a power supply for the entire apparatus, and a signal from the video signal decoding means is provided to the rearranging means If configured to be input, a portable projection display device can be realized.
[0018]
In the present invention, the first galvanometer mirror is driven by a sine wave or pulse wave drive signal, or the second galvanometer mirror is driven by a symmetric triangular wave drive signal. The beam is scanned two-dimensionally. Preferably, at this time, the light beam from the light source is modulated on the basis of the signal from the data rearranging means, and the scanning end portion in the scanning line direction is perpendicular to the scanning end portion. It is preferable that a desired blanking period is provided at the end of scanning in the direction to perform desired drawing on the irradiated object. In the control unit, in order to establish a blanking period and establish a scanning start position by a beam modulated based on image data, a light beam from a light receiving element installed near the end of the horizontal or vertical scanning range of the light beam is used. Or use a signal.
[0019]
In this manner, the light beam from the light source is modulated in accordance with the scanning state and timing based on the rearranged image information so as to make the end portion a non-drawing region in scanning in the scanning line direction. Or to modulate the light beam from the light source in accordance with the scanning state and timing based on the rearranged image information so as to make the end portion a non-drawing region in the scanning in the direction perpendicular to the scanning line direction. Or configured.
[0020]
Furthermore, in order to solve the above-described problems, the optical scanning method of the present invention scans a light beam in a direction perpendicular to the scanning line direction and a resonant first galvanometer mirror that scans the light beam in the scanning line direction. An optical scanning method for forming an image on an irradiated object by two-dimensionally scanning a light beam from a light source using a second galvanometer mirror, comprising a pixel unit in a scanning line and a scanning line unit in a screen The order of the image information is reversed in units of pixels in the scanning line between the forward pass period and the return pass period of the first galvanomirror scanning using the means for rearranging the image information in the above, and the second galvanomirror scan forward pass the duration and inverts the order of the image information in each scanning line on the screen in the return period, the drive signal based rather the light source to the reordered image information, the light from the light source to suit the scan state and timing Modulate the beam and make a second galva There rows drawn on the irradiated body by the modulated light beam in reciprocating scan of the first galvanometer mirror in the forward period and return period Nomira, or the number of scanning lines of one screen or is odd an even number Accordingly, the generation timing of the driving signal of the light source synchronized with the scanning of the first galvanometer mirror between the round trip period and the return path period of the second galvanometer mirror is an odd number of scanning lines. In this case, the blanking period is delayed by an odd multiple of a half cycle of the scanning frequency of the first galvanometer mirror, and an even multiple of a half cycle of the scanning frequency of the first galvanometer mirror if the number of scanning lines is an even number. It is characterized by providing . Also in the optical scanning method, various more specific modes are possible according to the more specific mode of the optical scanning device.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, horizontal scanning reciprocation is performed in both the forward scanning period and the backward scanning period. For this purpose, an optical scanning device such as a projection display device is provided with a rearrangement circuit for image signal data, and rearranges data in accordance with scanning.
[0022]
A galvanometer mirror is used for scanning. As the horizontal scanning mirror, it is also possible to use a micromirror manufactured by a semiconductor manufacturing process in which a Si substrate is patterned and etched to form a mirror. An example of a micromirror is described in the publication “Applied Physics Society of Japan Micro-Optics Research Group Institutional Paper, Vol. 14, No. 3, pp. 13-17,“ Silicon Micro Optical Scanner ”. For vertical scanning, a galvanometer mirror using a small stepping motor as a drive unit can be used.
[0023]
As the light source, a semiconductor laser or a light emitting diode can be used. Any light source can be used as long as the light source can emit a highly directional light beam having a certain high light intensity in a small cross section. The beam modulated based on the image data may be created by directly modulating and driving the light source based on the image data. An unmodulated beam emitted from the light source may be generated based on the image data by an external modulator. It may be created by modulation. However, when a semiconductor laser or a light emitting diode is used, direct modulation driving is suitable for downsizing, setting a non-drawing region, and the like.
[0024]
The control unit of the entire apparatus is composed of a CPU, a RAM, and a ROM that stores a program for controlling the entire apparatus. The control unit performs various input processes and image data development, modulates the beam based on the data developed, and causes the scanning system to scan the beam two-dimensionally in synchronization with this, thereby covering the image. Irradiate the irradiated body.
[0025]
【Example】
Hereinafter, specific embodiments will be described with reference to the drawings.
[0026]
(First Example)
The first embodiment will be described in detail with reference to FIGS.
FIG. 1 is a diagram showing a method of scanning a light beam on the screen of the projection display apparatus according to the first embodiment of the present invention. The horizontal direction is horizontal scanning (scanning in the scanning line direction), and the vertical direction is vertical scanning. The vertical scanning is exaggerated for ease of viewing. Arrows indicate the scanning direction. (a) shows scanning line scanning in the forward pass period of vertical scanning, (b) shows scanning line scanning in the backward path period of vertical scanning, and (c) shows scanning line scanning in one reciprocation of vertical scanning. In the example in FIG. 1, since the number of scanning lines in one screen is an even number, the scanning at the beginning of (b) is opposite to the scanning at the beginning of (a).
[0027]
In the present invention, the horizontal scanning (scanning in the scanning line direction) is based on the premise that the light beam is reciprocally scanned using a resonant galvanometer mirror driven by a driving signal such as a sine wave. For this reason, the horizontal scanning speed at the end of the horizontal scanning is significantly slower than the horizontal scanning speed at the center of the horizontal scanning. In the present invention, preferably, the light source is not driven at the end portion of the horizontal scanning, and the end portion is set as a non-drawing region (that is, a blanking period), thereby addressing the inconvenience caused by this. This is why there is a gap d between horizontal scanning lines in FIG.
[0028]
FIG. 2 shows data rearrangement for realizing the scanning method of the projection display apparatus of this embodiment. This rearrangement is performed by a data rearrangement circuit described later. For ease of understanding, the number of data per horizontal scan is set to 5, and the number of horizontal scans per vertical scan is set to 4. Here, one round-trip period of vertical scanning is shown. The numbers in FIG. 2 indicate the horizontal scanning number (that is, the scanning number) of the video signal input to the projection display device and the data number in the horizontal scanning number. For example, 2-3 is the third data of the second scanning line. The order of the data in the horizontal scan is reversed in the return path, that is, the even-numbered horizontal scan. The order of the data in the horizontal scanning unit in the vertical scanning period is reversed with respect to the horizontal scanning data in the forward path in the horizontal scanning unit in the horizontal scanning data in the backward scanning period of the vertical scanning. Thereby, in the scanning method of FIG. 1, the video obtained by the scanning can reproduce the input video signal.
[0029]
FIG. 3 is a block diagram of a control system of the projection display apparatus according to the present embodiment. Display device control circuit 301, data rearrangement circuit 302, oscillator 303, D (digital) / A (analog) converter 304, D / A converter 305, horizontal scanning driver 306, vertical scanning driver 307, light source driver control circuit 308 And an oscillator 309 and a light source driver 310.
[0030]
A display device control circuit 301 controls the entire display device. Among them, those particularly related to the present embodiment include generation of drive waveforms for the horizontal scanning system and vertical scanning system, and timing control of the light source driver control circuit 308. As an example of the drive waveform of the scanning system, an example with XGA resolution (horizontal 1024, vertical 768) and a frame frequency of 60 Hz is shown. The vertical scanning is 30 Hz (half of the frame frequency 60 Hz) as reciprocal drawing. The driving waveform is a symmetrical triangular wave.
[0031]
On the other hand, since the minimum frequency for horizontal scanning is 23.04 kHz (768 × 60/2 Hz), the horizontal scanning is set to 24 kHz in synchronization with the vertical scanning driving waveform (a blanking period is also taken into consideration). In order to realize this frequency with a single mirror, a resonance type micro mirror (a mirror that continues to move at the resonance frequency with a drive signal having a low resonance frequency) is used. Here, the micromirror typically refers to a small mirror manufactured by a semiconductor process in which a material substrate is patterned and etched to form a mirror surface at a desired location. Therefore, a sine wave is suitable for the driving waveform. The generation of waveforms for horizontal scanning driving and vertical scanning driving is performed via a D / A converter 304 and a D / A converter 305, respectively.
[0032]
The data rearrangement circuit 302 performs data rearrangement shown in FIG. It consists of a memory controller and memory. There are the following two configurations of the memory unit. One is a configuration of a single dual-port memory that can perform writing and reading independently. In this case, data of one frame or more is stored in the dual port memory, and the data is designated in the manner as shown in FIG. Output. The other is a configuration with two FIFO (First In First Out) memories and a static memory. In this case as well, the data is stored in the static memory through one of the FIFOs. Independent of this data input, the address is specified by the memory control unit in synchronization with the scanning state, and the static memory is used. Data is output in the manner shown in FIG. 2 through the other FIFO.
[0033]
The light source driver control circuit 308 reads the rearranged video signals from the data rearrangement circuit 302 and generates a light source drive signal at the clock rate of the oscillator 309 in synchronization with the timing signal from the display device control circuit 301. In this way, the scanning method shown in FIG. 1 is performed in the order of the data shown in FIG. Characteristic in timing is that the horizontal scanning synchronization signal is delayed by an odd multiple of a half cycle of the horizontal scanning frequency between the forward scanning period and the backward scanning period of the vertical scanning. That is, such a blanking period is provided. This reverses the direction of the first scanning in the forward scanning period and the backward scanning period.
[0034]
The light source drive signal is a digital signal obtained by subjecting pixel data of a video signal to pulse width modulation. The clock generated by the oscillator 309 is a pixel clock of the video signal. This clock frequency is 60 MHz. This value is a value in consideration of a blanking period in which a part of the edge of horizontal scanning is set to a non-drawing region at a pixel clock of 47.18592 MHz (1024 × 768 × 60 Hz) at a resolution of XGA and a frame frequency of 60 Hz.
[0035]
In this embodiment, the present invention can be applied to a monitor signal of a computer having an even number of scanning lines on one screen, and screen luminance can be improved and luminance unevenness can be reduced.
[0036]
(Second embodiment)
FIG. 4 is a diagram showing a scanning method of the projection display apparatus according to the second embodiment of the present invention. In this embodiment, the number of scanning lines per screen is an odd number. Therefore, the scanning direction of the first scanning line in the forward pass period and the return pass period of the vertical scanning is the same direction.
[0037]
The rearrangement of video data and the display device control system are the same as in the first embodiment. Since the number of scanning lines in one screen is an odd number, the timing control of the light source driver control circuit 308 by the display device control circuit 301 is different from the first embodiment. The horizontal scanning synchronization signal is delayed by an integral multiple of the horizontal scanning frequency period between the forward scanning period and the backward scanning period.
[0038]
In the present embodiment, the present invention can be applied to a television signal in which the number of scanning lines on one screen is an odd number, and screen luminance can be improved and luminance unevenness can be reduced.
[0039]
(Third embodiment)
FIG. 5 is a diagram showing a light source and a mirror scanning system of a projection display apparatus according to the third embodiment of the present invention. A horizontal scanning micromirror 501 that scans the light beam in the scanning line direction, a vertical scanning mirror 503 that scans the light beam in a direction perpendicular thereto, a semiconductor laser 502 that is a light source, a collimator lens 504 that collimates the light beam from the laser 502, It comprises an anamorphic prism 505, an f-θ lens 506, and a screen 507. Driving signals from the drivers 306, 307, and 310 shown in FIG. 3 are input to the micromirror 501, the galvanometer mirror 503, and the semiconductor laser 502, respectively.
[0040]
The anamorphic prism 505 converts the beam size of the light beam. In this embodiment, the anamorphic prism 505 is used to reduce the beam size having a cross-sectional diameter of several mm emitted from the collimator lens 504 to about 1 mm. As the light emitting element, a light emitting diode can be used instead of the semiconductor laser 502. Further, as in the conventional example of FIG. 7, RGB three-color light sources and their color composition system can be added to make a color. In this embodiment, the galvanometer mirror 503, which is a vertical scanning mirror, uses a small stepping motor as its drive unit (this drives the mirror 503 so as to change the beam deflection angle in the vertical direction at a substantially constant rate). Use things.
[0041]
In this embodiment, since a micromirror, a small stepping motor, and a semiconductor laser are used, it is possible to realize a projection display device that is small and light and suitable for carrying. In the present invention, since the non-drawing period in the scanning period can be reduced, the light intensity of the light source can be effectively used and the screen luminance can be improved. Therefore, the present invention is useful in application to a semiconductor light source that cannot be said to have sufficient light output at present.
[0042]
(Fourth embodiment)
FIG. 6 is a block diagram of a projection display apparatus according to the fourth embodiment of the present invention. The wireless interface 601, the video signal decoding circuit 602, the display device control system 603 (consisting of the configuration shown in the block diagram of FIG. 3), the light source / scanning system 604 of the display device, and the battery 605.
[0043]
The wireless interface 601 includes an antenna, an RF circuit, a signal processing circuit, and a memory. Wireless methods include IMT-2000 for mobile communications, IEEE802.11 for wireless LAN, Bluetooth, Multimedia Mobile Access Communication systems (MMAC), and IrDA (Infrared Data Association) for infrared data links. A special module has been developed.
[0044]
The video signal decoding circuit 602 decodes the video signal compressed for wireless connection. As a method, MPEG (Moving Picture Experts Group) 2 or MPEG4 having a higher compression rate is used.
[0045]
In this embodiment, the video signal is input to the projection display device wirelessly. By incorporating the battery 605 into the small light source / scanning system shown in the third embodiment, a projection display device that can operate without connecting a cable can be realized. Thereby, portability can be further improved.
[0046]
【The invention's effect】
According to the present invention, in an optical scanning device such as a projection display device that forms an image by light beam scanning, the screen brightness and the like with high-resolution specifications can be improved, and horizontal scanning is reciprocated only during the forward pass period of vertical scanning. However, it is possible to realize a reduction in luminance unevenness as compared with the case where drawing is not performed in the return pass period of vertical scanning.
[Brief description of the drawings]
FIG. 1 is a diagram showing a scanning method of a first embodiment of a projection display apparatus according to the present invention.
FIG. 2 is a diagram showing data rearrangement in a data rearrangement circuit of the control circuit of the projection display apparatus of the present invention.
FIG. 3 is a block diagram of a control circuit of a projection display apparatus according to the present invention.
FIG. 4 is a diagram showing a scanning method of a second embodiment of the projection display apparatus according to the present invention.
FIG. 5 is a block diagram of a light source and a scanning system of a projection display apparatus according to a third embodiment of the present invention.
FIG. 6 is a block diagram of a projection display apparatus according to a fourth embodiment of the present invention.
FIG. 7 is a schematic diagram of a configuration of a conventional light beam scanning projection display device.
[Explanation of symbols]
301: Display device control circuit
302: Data rearrangement circuit
303, 309: Oscillator
304, 305: D / A converter
306: Horizontal scan driver
307: Vertical scan driver
308: Light source driver control circuit
310: Light source driver
501: Micromirror
502: Semiconductor laser
503: Galvano mirror
504: Collimator lens
505: Anamorphic prism
506: f-θ lens
507: Screen
601: Wireless interface circuit
602: Video signal decoding circuit
603: Display device control system
604: Display device light source / scanning system
605: Battery
701: Red laser
702: Green laser
703: Blue laser
704, 705, 706: Dichroic mirror
707: Polygon mirror
708, 709, 710: Light intensity modulator

Claims (13)

A resonance-type first galvanometer mirror that scans the light beam in the scanning line direction and a second galvanometer mirror that scans the light beam in a direction perpendicular to the scanning line direction are provided, and the light beam from the light source is scanned two-dimensionally. An optical scanning device for forming an image on an irradiated object,
Means for rearranging image information in units of pixels in a scanning line and in units of scanning lines in a screen;
The rearrangement unit reverses the order of the image information in units of pixels in the scanning line between the first galvanomirror scanning forward period and the backward path period, and the second galvanomirror scanning forward period and backward path period. reversing the order of the image information in each scanning line in the screen, the driving signal of the light source rather based on the reordered image information, combined scan state and timing so as to modulate the light beam from the light source Configured,
The second galvanometer mirror is configured to perform drawing on the irradiated object with the modulated light beam by the reciprocating scan of the first galvanometer mirror during the forward path and the return path period .
The light source synchronized with the scanning of the first galvanometer mirror between the round trip period and the return path period of the second galvanometer mirror depending on whether the number of scanning lines of one screen is an even number or an odd number When the number of scanning lines is an odd number, an odd multiple of a half period of the scanning frequency of the first galvanometer mirror, and when the number of scanning lines is an even number, the drive signal generation timing of the first galvanometer mirror is generated. A blanking period is provided with an even multiple of a half cycle of the scanning frequency . 2. The optical scanning device according to claim 1, wherein the optical scanning device is configured as a projection display device that scans a light beam in two dimensions to form an image on a projection target. 3. The optical scanning device according to claim 1, wherein the first galvanometer mirror is configured to be driven by a sine wave or pulse wave drive signal. Said second galvanometer mirror optical scanning apparatus according to any one of claims 1 to 3, characterized in that it is constructed as driven by the drive signal of the symmetrical triangular wave. A semiconductor light-emitting element as a light beam of the light source, the semiconductor light emitting element, based on the reordered images information directly according to any one of claims 1 to 4, characterized in that a modulation drive Optical scanning device. The optical scanning device according to any one of claims 1 to 5, characterized by using a micro-mirror as the first galvanometer mirror. A wireless interface circuit for inputting a video signal, a video signal decoding means for decoding a video signal compressed and encoded for transmission, and a power supply for the entire apparatus, and a signal from the video signal decoding means is provided to the rearranging means the optical scanning device according to any one of claims 1 to 6, characterized in that the input. It is configured to modulate the light beam from the light source in accordance with the scanning state and timing based on the rearranged image information in order to make the end portion a non-drawing region in the scanning line direction scanning. the optical scanning device according to any one of claims 1 to 7, characterized. Based on the rearranged image information, the light beam from the light source is modulated based on the rearranged image information so that the end portion becomes a non-drawing region in the scanning direction perpendicular to the scanning line direction. the optical scanning device according to any one of claims 1 to 8, characterized in that is. Using a resonant first galvanometer mirror that scans the light beam in the scanning line direction and a second galvanometer mirror that scans the light beam in a direction perpendicular to the scanning line direction, the light beam from the light source is two-dimensionally An optical scanning method for scanning and forming an image on an irradiated object,
Using the means for rearranging the image information in units of pixels in the scanning line and in units of scanning lines in the screen, the order of the image information in units of pixels in the scanning line in the forward pass period and the return pass period of the first galvanometer mirror inverting the second reversing the order of the image information in each scanning line on the screen in the forward path period and return period of the scanning of the galvano mirror, the driving signal of the light source rather based on the reordered image information , Modulate the light beam from the light source in accordance with the scanning state and timing,
There rows drawn on the irradiated body by the modulated light beam in reciprocating scan of the first galvanometer mirror in the forward period and return period of the second galvanometer mirror,
The light source synchronized with the scanning of the first galvanometer mirror between the round trip period and the return path period of the second galvanometer mirror depending on whether the number of scanning lines of one screen is an even number or an odd number When the number of scanning lines is an odd number, an odd multiple of a half period of the scanning frequency of the first galvanometer mirror, and when the number of scanning lines is an even number, the drive signal generation timing of the first galvanometer mirror is generated. A blanking period is provided with an even multiple of a half cycle of the scanning frequency . 11. The optical scanning method according to claim 10 , wherein the optical scanning method is a projection display method in which a light beam is scanned two-dimensionally to form an image on a projection target. The light beam from the light source is modulated in accordance with a scanning state and timing based on the rearranged image information so that an end portion is a non-drawing region in scanning in a scanning line direction. The optical scanning method according to 10 or 11 . A light beam from the light source is modulated in accordance with a scanning state and timing based on the rearranged image information so that an end portion is a non-drawing region in scanning in a direction perpendicular to a scanning line direction. the optical scanning method according to any of claims 10 to 12,.

Images