KR20070036662A - Display method using diffractive optical modulator and apparatus thereof - Google Patents

Abstract

A mobile display apparatus using a scanning device and an optical modulator, the mobile display apparatus comprising: a sensing device generating a scanning device reference signal for detecting a position of the scanning device by sensing light reflected from one surface of the scanning device, and a scanning device reference received from the sensing device Display apparatus using an optical modulator including a driving signal control unit for generating a scanning device control signal and an optical modulator control signal so that the light emitted from the optical modulator can be reflected in a predetermined area of the scanning device by synchronizing the signal with the image synchronization signal Is presented. The display method and the apparatus using the optical modulator according to the present invention has the effect of synchronizing the rotation and position of the image signal and the scanning device.

Polygon mirror, light modulator, sync, mobile, display.

Description

Display method using diffractive optical modulator and Apparatus

Figure 1a is a schematic diagram showing a mobile display device using a light modulator and a polygon mirror according to the prior art.

Figure 1b is a block diagram of a mobile display device control unit according to the prior art.

2A is a perspective view of one type of diffractive light modulator module using a piezoelectric body applicable to a preferred embodiment of the present invention.

2B is a perspective view of another type of diffractive light modulator module using a piezoelectric body applicable to a preferred embodiment of the present invention.

2C is a plan view of a diffractive light modulator array applicable to a preferred embodiment of the present invention.

FIG. 2D is a schematic diagram in which an image is generated on a screen by a diffractive light modulator array applicable to a preferred embodiment of the present invention. FIG.

Figure 3 is a schematic diagram showing a mobile display device using an optical modulator and a polygon mirror according to a preferred embodiment of the present invention.

4A is a functional block diagram of a processing unit for synchronizing an image signal with a polygon mirror according to a preferred embodiment of the present invention.

4B is a block diagram of a mobile display device controller for synchronizing an image signal with a polygon mirror according to an exemplary embodiment of the present invention.

5A is a schematic diagram of generating a polygon mirror reference signal using a sensing device according to a preferred embodiment of the present invention.

Figure 5b is a configuration diagram showing the location of the detection device in accordance with a preferred embodiment of the present invention.

6A and 6B illustrate a state in which an image synchronization signal is synchronized with a polygon mirror reference signal by being delayed by a predetermined time according to a preferred embodiment of the present invention.

7 is a flowchart illustrating a display method using an optical modulator and a polygon mirror according to a preferred embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

410: mobile terminal platform

420: image input unit

430: image data processing unit

440: drive signal controller

450: diffraction type optical modulator

460: Scanning Driver

The present invention relates to a display device and a method thereof, and more particularly to a mobile display method and an apparatus using an optical modulator.

In general, optical signal processing has advantages of high speed, parallel processing capability, and large-capacity information processing, unlike conventional digital information processing, which cannot process a large amount of data and real-time processing, and design a binary phase filter using spatial light modulation theory. Research on fabrication, optical logic gates, optical amplifiers, image processing techniques, optical devices, optical modulators, etc. Dual optical modulators are used in the fields of optical memory, optical display, printer, optical interconnection, hologram, etc., and research and development of light beam scanning apparatus using them have been in progress.

Such a light beam scanning device scans a light beam in an image forming apparatus such as a laser printer, an LED printer, an electrophotographic copying machine, a word processor, and a projector to form an image image by spotting the light beam on a photosensitive medium.

Recently, with the development of projection television and the like, a light beam scanning device has been used as a means for scanning a beam on an image display.

Figure 1a is a schematic diagram showing a display device using a light modulator and a polygon mirror according to the prior art. Referring to FIG. 1A, a light source 110, a controller 120, a lens 130, a polygon mirror 140, and a screen 150 are illustrated. Here, although it is not necessary to use an optical modulator in the mobile projector, the following description will focus on the mobile projector using the optical modulator.

The light source 110 is a device that generates a laser beam to be reflected and diffracted by an optical modulator. Here, the light source 110 simultaneously generates a laser beam in a vertical direction, and the laser beam implements a 2D image by the rotating polygon mirror 140. According to another embodiment, the light source 110 may be implemented by a laser or a laser diode, and the light source 110 is turned on / off according to a driving control of the controller 120 to generate a laser beam. .

The controller 120 controls on / off of the light source 110 and driving of the polygon mirror 140.

The lens 130 focuses the laser beam generated from the light source 110 in the rotation axis direction of the polygon mirror 140.

The polygon mirror 140 is turned on / off according to the driving control of the controller 120, and rotates at a predetermined rotational speed during driving. The polygon mirror 140 is implemented as a polygon to reflect the beam incident through each surface during rotation.

The polygon mirror 140 includes a motor (not shown) capable of rotating in both directions, and reflects a beam scanned through the lens 130 in the direction of the screen 150 while rotating by the motor.

Looking at each configuration of such a display device in detail as follows. 1B is a block diagram of a mobile display device controller according to the related art. Referring to FIG. 1B, R, G, and B image signals are input from the mobile display device 160 to the mobile display device controller 170. Here, the image signal input unit 173 transfers the image signal received from the mobile display device 160 to the image correction unit 171, and the image signal is composed of R, G, and B digital data and timing signals. Thereafter, the image corrector 171 corrects the received image signal according to the deviation between elements or corrects the color characteristic. The image corrector 171 may be connected to the external memory 180 to read an initial setting value and then perform a correction process by correction logic.

The image data synchronizing signal output unit 175 rotates the image signal in the last scan direction in the vertical direction, and transmits a per-frame synchronizing signal, a pixel synchronizing signal, and a vertical line output timing signal to the panel driver 183. To pass.

The panel driver 183 converts digital image data into an analog signal for driving the panel, and drives the optical modulator panel 186 in synchronization with the vertical line output timing signal. In addition, the panel driver 183 matches the image gray level and the output voltage level with reference to the analog voltage range determined by the upper electrode voltage range adjusting unit 172.

The optical modulator panel 186 causes mechanical deformation by a relative voltage difference between the upper electrode and the lower electrode (voltage is applied by the lower electrode voltage controller 174) and modulates the diffraction amount of light incident from the light source 192. .

The scanner output control unit 176 outputs the position control signal of the scanning device 196 to the scanner driver 194 in synchronization with the vertical line output timing signal. The light source output controller 177 outputs a light source control signal to sequentially output the R, G, and B light sources in synchronization with the image synchronization signal, and transmits the light source control signal to the light source driver 190 driving the light source 192. The memory 180 stores a correction value (pixel-by-pixel, color-specific), an upper electrode voltage range, an initial setting value of the lower electrode voltage, a scanner profile, and a light source output setting value for the image corrector 171.

Here, in the mobile projector, when the optical modulator and the polygon mirror 140 are used, there is a need for synchronizing the image signal with the polygon mirror 140 to scan a predetermined beam on the screen 150. That is, in order to reflect the image on the screen 150 through the effective surface specified on one surface of the polygon mirror 140, the image synchronization signal and the rotation of the polygon mirror are controlled so that a laser beam according to the image signal is irradiated onto the effective surface. There is a need to do it.

The present invention provides a display method and apparatus using an optical modulator capable of synchronizing rotation and position of an image signal and a scanning device.

The present invention also provides a display method and apparatus using an optical modulator capable of controlling rotation of a scanning device by using an image synchronization signal and a scanning device reference signal generated by a sensing device.

Technical problems other than the present invention will be easily understood through the following description.

According to an aspect of the present invention, a mobile display device using a scanning device and an optical modulator, the sensing device for generating a scanning device reference signal for specifying the position of the scanning device by detecting the light reflected from one surface of the scanning device, A driving signal controller for generating a scanning device control signal and an optical modulator control signal to synchronize the scanning device reference signal received from the sensing device with the image synchronization signal so that the light emitted from the optical modulator can be reflected in a predetermined area of the scanning device; A display device using an optical modulator may be provided.

Here, the image synchronization signal may be delayed by a predetermined time and synchronized with the scanning device reference signal.

In addition, the display apparatus using the optical modulator according to the present invention may further include a scanning driver for controlling the rotation of the scanning device by receiving the scanning device reference signal or the scanning device control signal from a drive signal controller.

In addition, the display apparatus using the optical modulator according to the present invention may further include an optical modulator controller for receiving the optical modulator control signal from the drive signal controller to control the optical modulator.

According to another aspect of the present invention, an image input unit for receiving an image signal from a mobile terminal, an image data processing unit for converting the format of the image signal into a format of the image signal suitable for the optical modulator, wherein the image signal is an image synchronization signal and image data Including:-a sensing device for detecting the light reflected from one surface of the scanning device to generate a scanning device reference signal for specifying the location of the scanning device, the scanning device reference signal received from the sensing device is converted in the image data processor A display apparatus using an optical modulator including a driving signal controller for generating a scanning device control signal and an optical modulator control signal so that light emitted from the optical modulator may be reflected in a predetermined area of the scanning device by synchronizing with an image synchronization signal. Could The.

Here, the image synchronization signal may be delayed by a predetermined time and synchronized with the scanning device reference signal.

In addition, the display apparatus using the optical modulator according to the present invention may further include a scanning driver for controlling the rotation of the scanning device by receiving the scanning device reference signal or the scanning device control signal from a drive signal controller.

In addition, the display apparatus using the optical modulator according to the present invention may further include an optical modulator controller for receiving the optical modulator control signal from the drive signal controller to control the optical modulator.

According to another aspect of the invention, the step of receiving an image signal from the mobile terminal in the image input unit, converting the format of the image signal suitable for the optical modulator format of the image signal in the image data processing unit, of the scanning device in the sensing device Generating a scanning device reference signal for detecting a position of the scanning device by detecting the light reflected from one surface, and synchronizing the scanning device reference signal received from the sensing device by the driving signal controller with the image synchronization signal converted by the image data processor The present invention can provide a display method using an optical modulator including generating a scanning device control signal and an optical modulator control signal so that light emitted from the optical modulator can be reflected in a predetermined area of the scanning device.

Here, the image synchronization signal may be delayed by a predetermined time and synchronized with the scanning device reference signal.

The display method using the optical modulator according to the present invention may further include controlling the rotation of the scanning device by receiving the scanning device reference signal or the scanning device control signal from a driving signal controller in a scanning driver.

In addition, the display method using the optical modulator according to the present invention may further include the step of receiving the optical modulator control signal from the drive signal controller in the optical modulator controller to control the optical modulator.

Here, the scanning device may be a polygon mirror or a rotating bar.

Hereinafter, a display method using an optical modulator and a preferred embodiment of the device according to the present invention will be described in detail with reference to the accompanying drawings, in the description with reference to the accompanying drawings, the same components regardless of reference numerals are the same. Reference numerals will be omitted and duplicate description thereof will be omitted. In addition, the optical modulator applied to the present invention will be described first before describing the preferred embodiments of the present invention in detail.

Optical modulators are largely divided into a direct method of directly controlling the on / off of light and an indirect method using reflection and diffraction, and the indirect method may be divided into an electrostatic method and a piezoelectric method. Herein, the optical modulator is applicable to the present invention regardless of the manner in which the optical modulator is driven.

The electrostatically driven grating light modulator disclosed in US Pat. No. 5,311,360 includes a plurality of regularly spaced deformable reflective ribbons having reflective surface portions and suspended above the substrate.

First, an insulating layer is deposited on a silicon substrate, followed by a deposition process of a sacrificial silicon dioxide film and a silicon nitride film. The silicon nitride film is patterned with a ribbon and a portion of the silicon dioxide layer is etched so that the ribbon is held on the oxide spacer layer by the nitride frame. To modulate light with a single wavelength [lambda] 0, the modulator is designed such that the thickness of the ribbon and the thickness of the oxide spacers are [lambda] 0/4.

The lattice amplitude of this modulator, defined by the vertical distance d between the reflective surface on the ribbon and the reflective surface of the substrate, is the conduction of the ribbon (reflective surface of the ribbon serving as the first electrode) and the substrate (substrate serving as the second electrode). Film).

Figure 2a is a perspective view of one type of diffractive light modulator device using a piezoelectric element of the indirect light modulator applicable to the present invention, Figure 2b is another type of diffractive light modulator module using a piezoelectric material applicable to a preferred embodiment of the present invention Perspective view. 2A and 2B, an optical modulator including a substrate 210, an insulating layer 220, a sacrificial layer 230, a ribbon structure 240, and a piezoelectric material 250 is shown.

The substrate 210 is a commonly used semiconductor substrate, and the insulating layer 220 is deposited as an etch stop layer, and an etchant for etching a material used as a sacrificial layer, where the etchant is an etching gas or an etching solution. Solution). The reflective layers 220 (a) and 220 (b) may be formed on the insulating layer 220 to reflect incident light.

The sacrificial layer 230 supports the ribbon structure 240 at both sides so as to be spaced apart from the insulating layer 220 at regular intervals, and forms a space at the center.

As described above, the ribbon structure 240 causes diffraction and interference of incident light to optically modulate the signal. The shape of the ribbon structure 240 may be configured in the form of a plurality of ribbons according to the electrostatic method as described above, or may be provided with a plurality of open holes in the center of the ribbon according to the piezoelectric method. In addition, the piezoelectric member 250 controls the ribbon structure 240 to move up and down in accordance with the degree of contraction or expansion of up and down or left and right caused by the voltage difference between the upper and lower electrodes. Here, the reflective layers 220 (a) and 220 (b) are formed to correspond to the holes 240 (b) and 240 (d) formed in the ribbon structure 240.

For example, when the wavelength of light is λ, no voltage is applied or a predetermined voltage is applied to the upper reflective layers 240 (a) and 240 (c) and the lower reflective layer 220 (a) formed on the ribbon structure. )) Is formed, the interval between the insulating layer 220 is equal to nλ / 2 (n is a natural number). Therefore, in the case of the zero-order diffracted light (reflected light), the total path difference between the light reflected from the upper reflective layers 240 (a) and 240 (c) formed on the ribbon structure and the light reflected from the insulating layer 220 is equal to nλ, which is reinforced. By interfering, the diffracted light has maximum brightness. Here, in the case of + 1st and -1st diffraction light, the brightness of light has a minimum value due to destructive interference.

In addition, when an appropriate voltage different from the applied voltage is applied to the piezoelectric member 250, the upper reflective layers 240 (a) and 240 (c) and the lower reflective layers 220 (a) and 220 (b) formed on the ribbon structure. The gap between the insulating layers 220 on which? Is formed is equal to (2n + 1) λ / 4 (n is a natural number). Therefore, in the case of zero-order diffracted light (reflected light), the total path difference between the upper reflective layers 240 (a) and 240 (c) formed on the ribbon structure and the light reflected from the insulating layer 220 is (2n + 1) λ / 2. As shown in FIG. 8, the diffracted light has minimum luminance due to destructive interference. Here, in the case of + 1st and -1st diffraction light, the brightness of light has a maximum value due to constructive interference. As a result of this interference, the light modulator can adjust the amount of reflected or diffracted light to carry the signal on the light.

In the above, the case in which the distance between the ribbon structure 240 and the insulating layer 220 on which the lower reflective layers 220 (a) and 220 (b) are formed is nλ / 2 or (2n + 1) λ / 4 has been described. Naturally, various embodiments that can be driven at intervals that can adjust the intensity interfered by the diffraction and reflection of incident light can be applied to the present invention.

Hereinafter, the optical modulator of the type shown in FIG. 2A will be described.

Referring to FIG. 2C, the optical modulator includes a first pixel (pixel # 1), a second pixel (pixel # 2),. And m micro mirrors 100-1, 100-2,..., 100-m that are responsible for the m-th pixel (pixel #n). The optical modulator is responsible for the image information of the one-dimensional image of the vertical scanning line or the horizontal scanning line (assuming that the vertical scanning line or the horizontal scanning line is composed of m pixels), and each micromirror 100-1, 100-2. , ..., 100-m) is in charge of any one of m pixels constituting the vertical scan line or the horizontal scan line. Thus, the reflected and diffracted light in each micro mirror is then projected on the screen as a two dimensional image by the light scanning device. For example, in the case of VGA 640 * 480 resolution, 640 modulations are performed on one side of an optical scanning device (not shown) for 480 vertical pixels, thereby generating one frame of one screen per side of the optical scanning device. The optical scanning device may be a polygon mirror, a rotating bar, a galvano mirror, or the like.

Hereinafter, the principle of light modulation will be described based on the first pixel (pixel # 1), but the same may be applied to other pixels.

In the present embodiment, it is assumed that there are two holes 240 (b) -1 formed in the ribbon structure 240. Due to the two holes 240 (b)-1, three upper reflective layers 240 (a)-1 are formed on the ribbon structure 240. Two lower reflective layers are formed in the insulating layer 220 corresponding to the two holes 240 (b)-1. In addition, another lower reflective layer is formed on the insulating layer 220 corresponding to the portion of the gap between the first pixel (pixel # 1) and the second pixel (pixel # 2). Accordingly, the number of upper reflective layers 240 (a) -1 and lower reflective layers is the same for each pixel, and the luminance of modulated light using zero-order diffraction light or ± first-order diffraction light as described above with reference to FIG. 2A. It is possible to adjust.

Referring to FIG. 2D, there is shown a schematic diagram in which an image is generated on a screen by a diffractive light modulator array applicable to a preferred embodiment of the present invention.

Light reflected and diffracted by the k micromirrors 100-1, 100-2,..., 100-k arranged vertically is reflected by the optical scanning device and scanned horizontally on the screen 270. 280-1, 280-2, 280-3, 280-4, ..., 280- (k-3), 280- (k-2), 280- (k-1), 280-k) are shown. When rotated once in the optical scanning device, one image frame may be projected. Here, the scanning direction is shown in a left to right direction (arrow direction), but it is obvious that the image may be scanned in another direction (for example, the reverse direction).

3 is a schematic diagram showing a mobile display device using an optical modulator and a polygon mirror according to a preferred embodiment of the present invention. Hereinafter, the piezoelectric diffraction type optical modulator will be described. Referring to FIG. 3, a diffractive light modulator 310, a driving signal controller 320, a polygon mirror 330, and a screen 340 are shown.

The diffractive light modulator 310 is a device that reflects and diffracts a laser beam in response to an image signal. Here, the diffractive light modulator 310 simultaneously generates a laser beam in a vertical direction, and the laser beam implements a two-dimensional image by the rotating polygon mirror 330. In the diffraction type optical modulator 310 according to the present invention, the number of ribbons is determined according to projection pixels, and in general, 480 ribbons are arranged in the case of VGA 640 * 480 resolution to reflect and diffract a laser beam for a vertical pixel. Can be injected into the screen 340.

The driving signal controller 320 receives a timing value for beam scanning input from a sensing device (not shown) and controls driving of the diffraction type optical modulator 310 and the polygon mirror 330. Here, the driving signal controller 320 may synchronize the polygon mirror reference signal received from the sensing device with the image synchronizing signal so that the light emitted from the diffractive optical modulator 310 may be reflected in a predetermined area of the polygon mirror 330. It generates a polygon mirror control signal and an optical modulator control signal. Here, the polygon mirror control signal is a signal that a scanning driver (not shown) can control the polygon mirror. Such a signal may be generated separately or replaced with a polygon mirror reference signal.

Here, the lens (not shown) focuses the laser beam generated from the diffractive light modulator 310 in the rotation axis direction of the polygon mirror 330.

Here, the image synchronization signal is a signal for notifying the start of a new frame and the start of a new scan line in a frame. The new frame start is controlled by the vertical sync signal and the new scan line start by the horizontal sync signal. Since the diffraction type optical modulator 310 according to the present invention has a constant ribbon formed in the vertical direction, it needs to be synchronized in the horizontal direction.

The polygon mirror 330 is turned on / off according to the driving control of the driving signal controller 320 and rotates at a predetermined rotational speed during driving. The polygon mirror 330 is implemented as a polygon to reflect the beam incident through each surface during rotation. At this time, the beam reflected from one surface of the polygon mirror 330 forms a spot array at a predetermined interval by scanning, and is scanned on the screen 340, which spot arrays one screen of the screen 340. Create For example, in the case of VGA 640 * 480 resolution, 640 modulations are performed on one surface of the polygon mirror 330 for 480 vertical pixels, thereby generating one frame per screen of the polygon mirror 330.

The polygon mirror 330 includes a motor (not shown) capable of rotating in both directions, and reflects a beam scanned through the lens 130 in the direction of the screen 340 while rotating by the motor. Here, the polygon mirror 330 may be replaced by a rotating bar. In this case, the polygon mirror reference signal and the polygon mirror control signal may be generally referred to as a scanning device reference signal and a scanning device control signal, respectively. The following description mainly focuses on using a polygon mirror.

4A is a functional block diagram of a processing unit for synchronizing an image signal with a polygon mirror according to an exemplary embodiment of the present invention. Referring to FIG. 4A, a mobile terminal platform 410, an image input unit 420, an image data processor 430, a driving signal controller 440, a diffractive optical modulator 450, and a scanning driver 460 are illustrated. .

The mobile terminal platform 410 is a platform mounted on a mobile device such as a pocket PC, a mobile phone, or a smartphone. When an image signal is generated by a user's setting or default operation, the image signal is transmitted to the image input unit 420, and the image input unit 420 transmits the received signal to the image data processor 430. The video signal includes a video synchronization signal and video data.

The image data processor 430 converts the format of the input image signal into a format of an image signal suitable for an optical modulator.

The driving signal controller 440 synchronizes the polygon mirror reference signal received from the sensing device (not shown) with the image synchronization signal converted by the image data processor to reflect the light emitted from the optical modulator in a predetermined area of the polygon mirror. Control the polygon mirror and light modulator. The driving signal controller 440 may generate a separate polygon mirror control signal and an optical modulator control signal. Here, the sensing device detects light reflected from one surface of the polygon mirror to generate a polygon mirror reference signal for specifying the position of the polygon mirror. That is, a polygon mirror reference signal is generated which can control the rotation and the position of the polygon mirror so that light corresponding to the image data can be projected onto a predetermined effective surface on one surface of the polygon mirror.

The diffractive optical modulator 450 receives an optical modulator control signal transmitted from the driving signal controller 440 and operates according to the control signal. According to another exemplary embodiment, an optical modulator controller for receiving the optical modulator control signal from the driving signal controller 440 to control the diffractive optical modulator 450 may be further provided to control the diffractive optical modulator 450.

The scanning driver 460 receives the polygon mirror control signal from the driving signal controller 440 to control the rotation of the polygon mirror.

Details of the components included in the above-described mobile display device will be described in detail below. 4B is a block diagram of a mobile display device controller for synchronizing an image signal with a polygon mirror according to a preferred embodiment of the present invention.

Referring to FIG. 4B, the R, G, and B image signals are input from the mobile display apparatus 462 to the image signal input unit 466 included in the mobile display apparatus. Here, the image signal input unit 466 transfers the received image signal to the image correction unit 464, and the image signal is composed of R, G, and B digital data and timing signals. Thereafter, the image corrector 464 corrects the received image signal according to the deviation between elements or corrects the color characteristic.

The image data / synchronization signal output unit 480 rotates the image signal in the last scan direction in the vertical direction with respect to the image data corrected by the image correction unit 464, and performs an image synchronization signal and pixel synchronization per frame. Signal and the vertical line output timing signal to the panel driver 470.

The panel driver 470 converts the digital image data into an analog signal for driving the panel, and drives the optical modulator panel 475 in synchronization with the vertical line output timing signal. In addition, the panel driver 470 matches the image gray level and the output voltage level with reference to the analog voltage range determined by the upper electrode voltage range controller 467.

The optical modulator panel 475 causes mechanical deformation by a relative voltage difference between the upper electrode and the lower electrode (voltage is applied by the lower electrode voltage controller 468) and modulates the diffraction amount of light incident from the light source 492. .

The light source output controller 490 drives the light source 492 by outputting a light source control signal to sequentially output the R, G, and B light sources in synchronization with the image synchronization signal received from the image data / sync signal output unit 480. Transfer to the light source driver 491.

The scanner driver 493 controls the scanning device 494 to be driven at a constant speed. The light receiving element (or sensing device) 495 receives diffracted light reflected at a specific position of the scanning device 494. In this case, the diffracted light into which the diffracted light is input to the light receiving element 495 is converted into pulse data 495, and the converted pulse data is input to the image data / synchronous signal output unit 480. Therefore, the image data / synchronization signal output unit 480 may delay and output the image synchronization signal by a predetermined time as described below based on the received pulse data. Therefore, according to an embodiment of the present invention, an image signal may be output to a specific position of the scanning device 494 by using pulse data generated by the light receiving element 495.

In this case, the scanning device 494 is a device that does not have a position control function by a feedback device (for example, the scanner output control unit described above) such as an internal optical encoder, for example, a polygon mirror or a rotation tape. It can be a device in the form of a ting bar.

5A is a schematic diagram of generating a polygon mirror reference signal using a sensing apparatus according to a preferred embodiment of the present invention. Referring to FIG. 5A, a polygon mirror 330, a sensing device 510, a path a of light for generating a polygon mirror reference signal, and a path b of light corresponding to an image signal are shown.

The sensing device 510 may be provided at one side of the screen 340, and may be applied to the present invention as long as the sensing device 510 may detect a polygon mirror reference laser reflected from the polygon mirror 330. Here, the polygon mirror reference laser is a laser reflected from one surface of the polygon mirror 330 to generate a signal for monitoring the position of the polygon mirror. Here, the polygon mirror reference laser may be irradiated from the diffractive light modulator 450. In general, since the light reflected from both ends of the polygon mirror 330 may distort the image when it is irradiated to the screen, a certain effective surface (the effective surface width w) is specified on one surface of the polygon mirror 330. That is, since the distance between the polygon mirror 330 and the screen 340 is different from each other at the center and both sides of the screen 340, screen distortion occurs. Therefore, a certain range of effective surfaces may be specified on the polygon mirror 330 so that the screen distortion is limited within the allowable range.

 Accordingly, the polygon mirror reference laser may be a laser reflected outside the effective surface, and the polygon mirror reference laser may detect the polygon mirror reference laser, thereby generating a polygon mirror reference signal. In this case, in order for the image data to be projected onto the screen 340 using the effective surface, the polygon mirror reference signal and the image synchronization signal may be delayed and synchronized for a predetermined time. Here, the preset time may be a time required after the polygon mirror reference laser is reflected outside the effective surface until the laser corresponding to the image synchronization signal is first reflected on the effective surface.

Referring to FIG. 5B, the position of the sensing device 510 is specified. That is, the sensing device 510 receives the diffracted light before the image data is output to the screen 340. Therefore, since the light corresponding to the image signal is output to the screen 340 irrespective of the sensing device 510, the path is not disturbed by the sensing device 510.

This preset delay time is described in detail in FIGS. 6A and 6B. 6A is a diagram illustrating a state in which an image synchronization signal is synchronized with a polygon mirror reference signal by being delayed by a predetermined time according to an exemplary embodiment of the present invention. The image synchronization signals 620 (1) and 620 (2) are delayed and synchronized with the polygon mirror reference signals 610 (1), 610 (2) and 610 (3) by a predetermined time Δt, respectively. This delay time Δt may be relatively determined according to the size and rotation speed of one surface formed in the polygon mirror. Since the delay time Δt may be a time required to reach the effective surface from the edge of the polygon mirror, the delay time Δt may be correspondingly increased when one surface formed in the polygon mirror is large. In addition, when the rotational speed increases, the time required for reaching the effective surface from the edge of the polygon mirror becomes small, so that the delay time DELTA t decreases. That is, the delay time [Delta] t may be a difference between the time when the polygon mirror reference signal is generated outside the effective surface of one surface of the polygon mirror and the effective surface start point. The determining factor of this delay time DELTA t is roughly determined by the position where the effective surface is defined on one side of the polygon mirror, the rotational angular velocity of the polygon mirror and the rotation radius of the polygon mirror as follows.

(1)

(One)

(2)

(2)

Where? T is the delay time, r is the polygon mirror rotation radius, d is the distance between the position where the light corresponding to the polygon mirror reference signal is reflected on the polygon mirror and the starting point of the effective plane, T is the rotation period of the polygon mirror, Ω is the angular velocity of the polygon mirror. In practice, precise tuning is required through a signal tuning process depending on the difference in the turning radius.

Referring to this in connection with the image data, the image data 630 (1) and 630 (Δt) after a time elapses from the time when the polygon mirror reference signals 610 (1) and 610 (2) are output in FIG. 6B. 2)) is output. The image data 630 (1) and 630 (2) are output by the preset number of trees (640 (1) and 640 (2)).

7 is a flowchart illustrating a display method using an optical modulator and a polygon mirror according to a preferred embodiment of the present invention.

In step S710, an initial polygon mirror reference signal is set. The polygon mirror reference signal set here is a default value and is a value modified by the detected polygon mirror reference. Thereafter, the image input unit receives an image signal from the mobile terminal.

In operation S720, the image data processing unit converts the format of the image signal into a format suitable for an optical modulator, and detects light reflected from one surface of the polygon mirror by the sensing device to specify a polygon mirror position. Generate a reference signal.

In operation S730, the light emitted from the optical modulator is synchronized with the polygon mirror reference signal received from the sensing device by the driving signal controller by a predetermined time delayed by the image data processor to be preset. It generates a polygon mirror control signal and an optical modulator control signal so that they can be reflected from.

In step S740, the polygon mirror is controlled using the polygon mirror control signal, and the predetermined image is projected on the screen by controlling the light modulator using the optical modulator control signal.

The present invention is not limited to the above embodiments, and many variations are possible by those skilled in the art within the spirit of the present invention.

As described above, the display method and the apparatus using the optical modulator according to the present invention have the effect of synchronizing the rotation and position of the image signal and the polygon mirror.

In addition, the display method and the apparatus using the optical modulator according to the present invention has the effect of controlling the rotation of the polygon mirror by using the image synchronization signal and the polygon mirror reference signal generated by the sensing device.

Although the above has been described with reference to a preferred embodiment of the present invention, those of ordinary skill in the art to the present invention without departing from the spirit and scope of the present invention and equivalents thereof described in the claims below It will be understood that various modifications and changes can be made.

Claims (14)

In the mobile display device using a scanning device and an optical modulator, A sensing device for sensing light reflected from one surface of the scanning device to generate a scanning device reference signal for specifying a location of the scanning device; And Synchronizing the scanning device reference signal received from the sensing device with an image synchronizing signal to generate a scanning device control signal and an optical modulator control signal so that the light emitted from the optical modulator can be reflected in a predetermined area of the scanning device; Display device using an optical modulator including a drive signal controller. The method of claim 1, And the image synchronization signal is delayed by a predetermined time and synchronized with the scanning device reference signal. The method of claim 1, And a scanning driver configured to receive the scanning device reference signal or the scanning device control signal from the driving signal control unit to control the rotation of the scanning device. The method of claim 1, And an optical modulator controller configured to receive the optical modulator control signal from the driving signal controller to control the optical modulator. An image input unit configured to receive an image signal from a mobile terminal; An image data processor for converting a format of the image signal into a format of an image signal suitable for an optical modulator, wherein the image signal includes an image synchronization signal and image data; A sensing device for sensing light reflected from one surface of a scanning device to generate a scanning device reference signal for specifying a location of the scanning device; And Control the scanning device so that the light emitted from the optical modulator can be reflected in a preset area of the scanning device by synchronizing the scanning device reference signal received from the sensing device with the image synchronizing signal converted by the image data processor. Display device using an optical modulator comprising a drive signal control unit for generating a signal and an optical modulator control signal. The method of claim 5, And the image synchronization signal is delayed by a predetermined time and synchronized with the scanning device reference signal. The method of claim 5, And a scanning driver configured to receive the scanning device reference signal or the scanning device control signal from the driving signal control unit to control the rotation of the scanning device. The method of claim 5, And an optical modulator controller configured to receive the optical modulator control signal from the driving signal controller and control the optical modulator. Receiving an image signal from a mobile terminal at an image input unit; Converting a format of the image signal suitable for an optical modulator by the image data processor; Generating a scanning device reference signal for detecting a position of the scanning device by detecting light reflected from one surface of the scanning device in a sensing device; The driving signal control unit synchronizes the scanning device reference signal received from the sensing device with the image synchronizing signal converted by the image data processing unit so that the light emitted from the optical modulator can be reflected in a predetermined area of the scanning device. A display method using an optical modulator, comprising generating a device control signal and an optical modulator control signal. The method of claim 9, And the image synchronization signal is delayed by a predetermined time and synchronized with the scanning device reference signal. The method of claim 9, And controlling the rotation of the scanning device by receiving the scanning device reference signal or the scanning device control signal from the driving signal controller in a scanning driver. The method of claim 9, And controlling the optical modulator by receiving the optical modulator control signal from the driving signal controller in the optical modulator controller. The method according to claim 1 or 5, And the scanning device is a polygon mirror or rotating bar. The method of claim 9, And the scanning device is a polygon mirror or rotating bar.

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