KR101315971B1 - Apparatus for ultra-compact laser projector, laser projection system and method - Google Patents

Abstract

The present invention uses a laser drive signal and a scanner drive signal to drive an ultra-small laser device and an ultra-small 2D scanner in the form of MEMS, thereby realizing rich color and high image quality due to laser characteristics with less power consumption than LCD or CRT. It is a laser projector that can maximize the space saving by realizing the projection display in the narrow space by replacing the large monitor such as CRT or LCD. The laser projector is a video signal processor for generating green, red, and blue laser driving signals and scanner driving signals based on an input video signal, and green, red, and blue lasers in response to the respective laser driving signals. And a laser generator for generating a beam, and a scanner for projecting laser beams generated by the laser generator in response to the scanner driving signal, wherein the video signal processor is configured to output green, red, and blue colors from the input video signal, respectively. Generates a video signal, a horizontal synchronizing signal and a vertical synchronizing signal, generates the respective laser driving signal from the respective video signal, and generates the scanner driving signal using the horizontal synchronizing signal and the vertical synchronizing signal. .

Laser, scanner, projector, laser diode, DPSS, AOM

Description

APPARATUS FOR ULTRA-COMPACT LASER PROJECTOR, LASER PROJECTION SYSTEM AND METHOD}

1 is a block diagram showing the configuration of a laser projector according to an embodiment of the present invention;

2 is a flowchart illustrating a display method using a laser projector according to an embodiment of the present invention;

FIG. 3 is a diagram for describing video signal processing in the video signal interface of FIG. 1; FIG.

4 is a detailed block diagram illustrating an embodiment of the scanner driver of FIG. 1;

FIG. 5 is a diagram for describing horizontal synchronization signal processing in the scanner driver of FIG. 1; FIG.

FIG. 6 is a diagram for describing vertical synchronization signal processing in the scanner driver of FIG. 1; FIG.

7 is a view for explaining a method in which a scanner projects a laser beam on a screen;

And

8 is a view illustrating a laser projection system for installing and displaying a laser projector according to the present invention on a desk.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser projector, and in particular, by driving a micro laser device and a micro 2D scanner in the form of a micro electro-mechanical system (MEMS) using a laser drive signal and a scanner drive signal generated from a video signal. Compared to LCD (Liquid Crystal Display) or CRT (Color Ray Tube), it is possible to realize rich color and high image quality due to the laser characteristics with less power consumption. The present invention relates to an apparatus and method for a compact laser projector that can maximize space savings by realizing it.

A projector or projection system is a display device that processes a video signal received from a personal computer (PC) or an audio / video (AV) system and projects the corresponding image on a screen. The projector can be used for presentations in conference rooms or as a home theater in the home.

Most modern projectors use LCDs and CRTs. For example, in order to realize a large screen, a projector that enlarges an image appearing on an LCD or a CRT using an optical system and then projects it on a screen is used. However, such a method of simply enlarging an image does not provide a clear image quality, but also has a problem that the volume is large and the power consumption is large.

Efforts are being made to reduce the size and weight of the projector by using a laser and a DMD panel (Digital Micro-mirror Device Panel) to improve brightness and color reproduction. Such a projector is known to be able to realize a high quality color image by rapidly scanning a laser beam using a micro scanner. However, such a projector is composed of a laser light source, a power supply unit for supplying power to the laser light source, a mirror optical system for delivering a laser beam, a micro scanner, and the like, so that the configuration is very complicated and the volume is inconvenient to carry. There is still a big problem. Therefore, since such a conventional structure is no longer difficult to reduce the size of the projector, many efforts have been made to further reduce the size of the projector.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. In order to realize a projection display in a narrow space and to realize rich colors and high image quality due to laser characteristics even with a small power consumption, an ultra-small laser device and an ultra-small 2D scanner are used. It is an object of the present invention to provide an apparatus and method for driving a micro laser projector.

In addition, the present invention can realize a projection display on a roll-type screen even in space-constrained places such as a desk in order to eliminate the space devoted to using a large monitor such as a CRT or LCD, maximizing space saving An object of the present invention is to provide an apparatus and a method for realizing an ultra-small laser projector.

According to an aspect of the present invention, a laser projector includes: a video signal processor configured to generate laser driving signals and scanner driving signals of green, red, and blue, respectively, based on an input video signal; A laser generator generating green, red, and blue laser beams in response to the respective laser driving signals; And a scanner for projecting laser beams generated by the laser generator in response to the scanner driving signal, wherein the video signal processor comprises green, red, and blue video signals, horizontal sync signals, and the like from the input video signal. A vertical synchronizing signal is generated, the respective laser driving signals are generated from the respective video signals, and the scanner driving signal is generated using the horizontal synchronizing signal and the vertical synchronizing signal.

Here, the video signal processor generates the respective laser driving signals by temporally inverting the respective video signals one cycle every two horizontal scan periods, and generates a horizontal scanner driving signal having a half frequency of the horizontal synchronization signal. And synthesizing the vertical scanner driving signal synchronized with the vertical synchronizing signal to generate the scanner driving signal.

Preferably, the horizontal scanner driving signal has a sine wave shape, and the vertical scanner driving signal has a triangular wave shape.

In addition, the scanner is preferably implemented as a two-dimensional beam scanning device of the MEMS (Micro Electro-Mechanical System) type.

 The green laser driving signal is a voltage signal for driving the green laser device, and the red and blue laser driving signals are preferably current signals for driving the red and blue laser devices respectively, or the green, red and blue It is also possible to make each laser drive signal a current signal which drives each laser element of green, red, and blue.

For example, the laser generation unit may include a green laser device configured to generate a green laser beam in response to the green laser driving signal; A red laser device generating a red laser beam in response to the red laser drive signal; And a blue laser device generating a blue laser beam in response to the blue laser driving signal.

The green laser device includes a Diode-Pumped Solid State (DPSS) for generating a green laser beam and an Acousto Optic Modulator (AOM) for modulating the green laser beam generated from the DPSS according to the green laser driving signal. The red laser device may include a red laser diode that generates a red laser beam according to the red laser drive signal, and the blue laser device may include a blue laser diode that generates a blue laser beam according to the blue laser drive signal. It is done.

The green laser device may include a green laser diode that generates a green laser beam according to the green laser drive signal, and the red laser device may include a red laser diode that generates a red laser beam according to the red laser drive signal. The blue laser device may include a blue laser diode that generates a blue laser beam according to the blue laser driving signal.

The video signal processor generates green, red, and blue video signals, a horizontal sync signal, and a vertical sync signal from the input video signal, and inverts each of the video signals one cycle every two horizontal scan periods. A video signal interface to generate a video line inversion signal for each of the green, red, and blue colors; A first laser driver configured to generate the red laser driving signal by voltage-current converting the red video line inversion signal; A second laser driver configured to generate the blue laser driving signal by voltage-current converting the blue video line inversion signal; And a scanner driver configured to generate the scanner driving signal from the horizontal synchronizing signal and the vertical synchronizing signal, wherein the green video line inversion signal generated by the video signal interface is the green laser driving signal.

The video signal processor may further include a third laser driver configured to generate a voltage-current converted signal of the green video line inversion signal as the green laser driving signal.

The scanner driver may include: a first circuit configured to generate a horizontal scanner driving signal having a half frequency of the horizontal synchronization signal; A second circuit for generating a vertical scanner driving signal having the same frequency as the vertical synchronizing signal; And a third circuit for synthesizing the horizontal scanner driving signal and the vertical scanner driving signal to generate the scanner driving signal.

A laser projector according to another aspect of the present invention for achieving the above object is a laser projector for displaying by using a laser, the green, red and blue video signal, horizontal sync signal and vertical sync signal respectively from the input video signal A video signal processor for generating a laser driving signal of green, red, and blue from the respective video signals, and generating a scanner driving signal using the horizontal synchronization signal and the vertical synchronization signal; Green, red, and blue laser elements each generating green, red, and blue laser beams in response to the respective laser drive signals; And a scanner configured to form an image by projecting laser beams generated by the respective laser elements on a screen in response to the scanner driving signal, wherein the green laser element generates a green laser beam according to the green laser driving signal. DPSS and AOM, wherein each of the red and blue laser device comprises a laser diode for generating a laser beam of each of the red and blue in accordance with the laser drive signal of each of the red and blue.

According to another aspect of the present invention, a laser projection system includes: a laser projector embedded under a pinhole on an upper surface of a desk; And a roll screen stored on the floor of the desk, wherein the laser projector processes a video signal to project laser beams generated by the laser elements of each of the green, red, and blue laser beams through the pinhole onto the roll screen. The green laser device generates a green laser beam using DPSS and AOM, and each of the red and blue laser devices generates a red and blue laser beam using a laser diode. .

According to yet another aspect of the present invention, a projection display method includes: receiving an input video signal; Generating green, red, and blue respective video signals, a horizontal synchronizing signal, and a vertical synchronizing signal from the input video signal to generate respective green, red, and blue laser drive signals from the respective video signals; Generating a scanner driving signal using the signal and the vertical synchronization signal; Generating respective laser beams of green, red, and blue in response to the respective laser drive signals; And projecting the generated laser beams in response to the scanner drive signal.

A projection display method according to another aspect of the present invention for achieving the above object, a projection display method using a laser, green, red, and blue in response to the laser driving signal of each of the green, red, and blue Generating each laser beam; And projecting the generated laser beams onto a screen in response to a scanner driving signal to form an image, wherein the green laser beam is generated according to the green laser driving signal using a green laser device including DPSS and AOM. And generate the red and blue laser beams according to the red and blue laser driving signals using the red and blue laser elements each including a laser diode.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 1 to 8.

1 is a block diagram showing the configuration of a laser projector 100 according to an embodiment of the present invention. Referring to FIG. 1, the laser projector 100 includes a video signal processor 110, a laser generator 120, and a scanner 130.

The laser projector 100 is a projection display device that processes a video signal input from a video signal output device such as a personal computer (PC) or an audio / video (AV) system and projects the corresponding image on a screen. Even in a space-constrained place such as a desk, it can be implemented as a micro, for example, about 50cc to maximize space savings by eliminating space devoted to using a large monitor such as CRT or LCD. However, the present invention is not limited thereto, and the laser projector 100 may be used for presentation in a conference room or may be used as a home theater in a home.

In addition, the laser projector 100 drives the micro laser elements in the laser generator 120 by using the laser driving signals generated from the input video signal by the video signal processor 110, and inputs the data from the video signal processor 110. By using the scanner driving signal (SDS) generated from the video signal to drive the ultra-small 2D (2-dimensional) scanner 130 in the form of Micro Electro-Mechanical System (MEMS), the projection display is realized in a very small size. As a result, compared to LCD (Liquid Crystal Display) or CRT (Color Ray Tube) monitor, it is possible to realize rich color and high image quality due to the laser characteristics with less power consumption.

To this end, in FIG. 1, the video signal processor 110 includes a video signal interface 111, a first laser driver 112, and a second laser driver 113, and the laser generator 120 is a green laser. Element 121, red laser element 125, and blue laser element 126. Reference is made to the flowchart of FIG. 2 for the operation of the laser projector 100 having such a configuration.

First, the video signal processor 110 receives a video signal input from a video signal output device such as a PC or an AV system (S210). Accordingly, the video signal processor 110 generates a laser driving signal and a scanner driving signal SDS of green, red, and blue, respectively, based on the received input video signal (S220). The video signal processor 110 generates a video signal, a horizontal sync signal H, and a vertical sync signal V, respectively, for the green, red, and blue colors, from the input video signal. Each of the laser driving signals is generated from the video signal of, and the scanner driving signal (SDS) is generated using the horizontal synchronizing signal (H) and the vertical synchronizing signal (V).

In more detail, the video signal interface 111 included in the video signal processor 110 receives a video signal input from a video signal output device. The input video signal may be input in various standards such as R, G, B standard, Y, Pb, Pr standard or composite signal form, which is a color signal standard, and various correspondences, for example, VGA, SVGA Various correspondences, such as XGA, SXGA, etc., can be entered as a standard. In addition, the input video signal is preferably input as a digital signal, but is not limited thereto and may be input as an analog signal. In this case, when the input video signal is input as an analog signal, an analog-to-digital converter (ADC) may be used to convert the input video signal into a digital signal.

When the input video signal is received, first, the video signal interface 111 performs a video signal, a horizontal sync signal (H), and a vertical sync of each of the green (G), red (R), and blue (B) signals from the input video signal. Generate signal (V). At this time, the video signal interface 111 temporally inverts the respective video signals by one period every two horizontal scan periods so that the video line inversion signals G_v, R_v, and B_v of each of the green, red, and blue colors are inverted. ) The video line inversion signals G_v, R_v, and B_v are based on the generation of the laser driving signal. The horizontal synchronizing signal H and the vertical synchronizing signal V are input to the scanner driver 114, and the scanner driver 114 uses the horizontal synchronizing signal H and the vertical synchronizing signal V to scan the scanner. The driving signal SDS is generated.

3 is described to describe a method of generating video line inversion signals G_v, R_v, and B_v in the video signal interface 111 of FIG.

Referring to FIG. 3, for example, in the case of a ramp waveform that is the basis of gradation representation, the green (G), red (R), or blue (B) generated by the video signal interface 111 is generated. The video signal is equal to 310. The signal scan of LCD or CRT scans recursively from left to right for each horizontal line, but the movement direction of the scanner 130 is sinusoidal or zigzag, so the video scene In order for the call to be scanned, the video signal interface 111 inverts each video signal temporally by one period every two horizontal scan periods, such as 320, so that each of the green, red, and blue video line inversion signals G_v , R_v, B_v).

In addition, the video line inversion signals G_v, R_v, and B_v are based on generation of a laser driving signal as a voltage signal. First, according to an exemplary embodiment of the present invention, the green video line inversion signal G_v generated by the video signal interface 111 includes a green laser device including a Diode-Pumped Solid State (DPSS) and an Acousto Optic Modulator (AOM). It is used as a green laser drive signal for driving 121). In addition, the first laser driver 112 generates a red laser driving signal R_i for driving the red laser device 125 in the form of a laser diode by voltage-current converting the red video line inversion signal R_v. The second laser driver 113 performs a voltage-to-current conversion of the blue video line inversion signal B_v to drive the blue laser driving signal B_i for driving the blue laser device 126 in the form of a laser diode (LD). Create Here, AOM is a device driven by a voltage, so voltage-to-current conversion is unnecessary, but since a laser diode is a device driven by current, a first laser driver 112 and a second laser driver 113 for voltage-current conversion are required. will be. The first laser driver 112 and the second laser driver 113 may include means for adjusting an offset in order to cover the physical characteristics of the laser diode so as to expand the dynamic range. It may also include means for controlling gain to adjust the size of the output.

As another example, if the size of the green laser diode can be manufactured to be very small, for example, 10 mm or less in the future, the green laser diode may be used as the green laser element 121 instead of the DPSS and the AOM. In this case, the video signal processing unit 110 generates a signal obtained by voltage-current conversion of the green video line inversion signal G_v as a green laser driving signal for driving a green laser diode (see FIG. 1). Not shown).

 As such, the green laser driving signal is a voltage signal for driving the green laser device 121, and the red and blue laser driving signals are preferably current signals for driving the red and blue laser devices, respectively. It is also possible to set each of the laser driving signals of green, red and blue to be a current signal for driving each of the green, red and blue laser elements.

In FIG. 1, the scanner driver 114 generates the scanner driving signal SDS using the horizontal synchronization signal H and the vertical synchronization signal V generated by the video signal interface 111.

4 is a detailed block diagram of the scanner driver 114 according to an embodiment of the present invention. Referring to FIG. 4, the scanner driver 114 includes a sine wave generating circuit 115, a triangular wave generating circuit 116, and a signal synthesizing circuit 117. 4 and 5 will be described to explain a method of generating the scanner driving signal SDS by the scanner driver 114.

First, FIG. 5 is a diagram for describing a method of generating a horizontal scanner driving signal H_drive from a horizontal synchronizing signal H.

As described above, in order for the scanner 130 to move in a sinusoidal or zigzag form so that the laser beam can be scanned in both directions, the scanner driver 114 includes a predetermined circuit, for example. For example, the horizontal scanner driving signal H_drive is generated in the form of one sine wave every two periods of the horizontal synchronizing signal H generated by the video signal interface 111 using the sine wave generating circuit 115 of FIG. 4. Create To determine each inflection point of the sine wave, a pulse of each period of the horizontal synchronization signal H may be referred to. The generated horizontal scanner drive signal H_drive appears as a frequency of 21.9 KHz, which is half the frequency of the horizontal synchronization signal H, for example, when the frequency of the horizontal synchronization signal H is 43.8 KHz. In order to adjust the scanning position properly when the scanner 130 scans the screen, the phase adjusting means or the center frequency, for example, to adjust the phase of the horizontal scanner drive signal H_drive by a certain amount, for example, Frequency adjusting means, which can vary from about 21 kHz to about 1.0 kHz, may be included in the sinusoidal wave generating circuit 115. In addition, the sine wave generating circuit 115 may further include amplitude adjusting means for varying the absolute amplitude of the horizontal scanner driving signal H_drive from 1.0 to 10.0V.

FIG. 6 is a diagram for describing a method of generating a vertical scanner driving signal V_drive from a vertical synchronizing signal V. FIG.

In order to allow the scanner 130 to move in a sinusoidal or zigzag form to scan the laser beam in a vertical direction, the scanner driver 114 may include a predetermined circuit, for example, FIG. 4. The triangular wave generating circuit 116 generates a vertical scanner driving signal V_drive in one triangular form at each period of the vertical synchronizing signal V generated by the video signal interface 111. Similar to the vertical deflection signal for driving the CRT, the vertical scanner drive signal V_drive appears at a point about 1: 7 of each period, which can be designed to be variable to suit the scanning position. . The vertical scanner drive signal V_drive generated in this way is, for example, equal to the frequency 62.714 Hz of the vertical synchronization signal V. FIG. In order to properly adjust the scanning position when the scanner 130 scans the screen, the phase adjusting means or the center frequency, for example, to adjust the phase of the vertical scanner drive signal V_drive by a certain amount, for example, Frequency adjusting means, which can vary from 62.714 to about ± 5 Hz, may be included in the triangular wave generation circuit 116. The triangular wave generating circuit 116 may further include amplitude adjusting means for varying the absolute amplitude of the vertical scanner driving signal V_drive from 1.0 to 10.0V.

When the horizontal scanner drive signal H_drive and the vertical scanner drive signal V_drive are generated as described above, the scanner driver 114 synthesizes the horizontal scanner drive signal H_drive and the vertical scanner drive signal V_drive as shown in FIG. 6. For example, the frequency synthesis is performed to generate the scanner driving signal SDS synchronized with the synchronization signals H and V. FIG. Here, a predetermined circuit such as an adder or a frequency synthesizer, for example, the signal synthesis circuit 117 of FIG. 4 may be used for frequency synthesis.

On the other hand, the laser generating unit 120 generates a laser beam of each of the green, red, and blue in response to the laser driving signal of each of the green, red, and blue generated as described above (S230 of FIG. 2).

More specifically, in FIG. 1, the green laser device 121 generates a green laser beam in response to a green laser driving signal generated by the video signal processor 110, for example, G_v. In addition, the red laser device 125 generates a red laser beam in response to a red laser driving signal generated by the video signal processor 110, for example, R_i. The blue laser device 126 generates a blue laser beam in response to a blue laser driving signal generated by the video signal processor 110, for example, B_i.

In particular, the green laser device 121 modulates a Diode-Pumped Solid State (DPSS) 122 for generating a green laser beam and an AOM for modulating the green laser beam generated from the DPSS 122 according to the green laser driving signal. (Acousto Optic Modulator) 123. Here, although a laser diode may be used to generate the green laser beam, since the manufacture of a very small green laser diode is difficult with the current technology, DPSS and AOM, which can be reduced in size, are used. DPSS is a device that causes the laser beam to be oscillated by using a solid crystal capable of generating a laser beam such as artificial ruby, glass or YAG (yttrium-aluminum garnet), and AOM is a control voltage, for example, a green laser. The device modulates the green laser beam generated from the DPSS to output the laser beam of the appropriate wavelength according to the driving signal G_v.

The red laser device 125 may include a red laser diode that generates a red laser beam according to the red laser driving signal R_i generated by the video signal processor 110, and the blue laser device 126 may include a video signal processor ( And a blue laser diode that generates a blue laser beam according to the blue laser driving signal B_i generated by 110. A laser diode is a device manufactured using materials such as semiconductor silicon, GaAs, and the like to generate a laser beam by driving current.

As described above, in the future, when the size of the green laser diode can be manufactured to be extremely small, for example, 10 mm or less, a green laser diode may be used as the green laser element 121 instead of DPSS and AOM. .

When the green laser element 121, the red laser element 125, and the blue laser element 126 are all implemented with laser diodes, as described above, in order to drive the green laser element 121 with current, The video signal processor 110 may generate a third laser driver (not shown in FIG. 1) to generate a signal obtained by voltage-current conversion of the green video line inversion signal G_v as a green laser drive signal for driving a green laser diode. ) May be further included.

However, as shown in FIG. 1, when the DPSS and the AOM are used as the green laser element 121, and the laser diode is used as each of the red laser element 125 and the blue laser element 126, the third laser driver is used. It is unnecessary. That is, in this case, the green video line inversion signal G_v generated by the video signal processor 110 drives AOM directly as a green laser driving signal, and the video signal processor 110 performs red and blue video lines. The signals R_i and B_i obtained by voltage-current conversion of the inversion signals R_v and B_v drive the corresponding laser diodes as red and blue laser driving signals.

Meanwhile, in step 240 of FIG. 2, the scanner 130 generates the laser generated by the laser generator 120 in response to the scanner driving signal SDS generated by the scanner driver 114 of the video signal processor 110. The beams are collected and scanned on the screen to project an image. As described above, in order to realize the ultra-compact laser projector 100, the scanner 130 is preferably implemented as a two-dimensional beam scanning device of the MEMS (Micro Electro-Mechanical System) type.

7 is a diagram for describing a method in which the scanner 130 projects a laser beam on a screen. As illustrated in FIG. 7, the scanner 130 moves horizontally and vertically in a sinusoidal or zigzag form to scan a laser beam onto a screen. That is, the scanner 130 is vertically moved by an envelope waveform of the vertical scanner driving signal V_drive according to the scanner driving signal SDS as shown in FIG. 7 and synthesized with the vertical scanner driving signal V_drive. Horizontal movement is performed by the loaded horizontal scanner drive signal (H_drive). Accordingly, the scanner 130 collects the laser beams generated by the laser generator 120 to scan one line in the right direction and the next line in the opposite direction to form a corresponding image on the screen.

As described above, the video signal processing unit 110 performs the video signal, the horizontal sync signal H, and the vertical sync signal V, respectively, of the green (G), red (R), and blue (B) signals from the input video signal. And generate laser driving signals of green, red, and blue from the respective video signals, and use the horizontal synchronizing signal (H) and the vertical synchronizing signal (V) to generate a scanner driving signal (SDS). Create Accordingly, each of the green, red, and blue laser devices generates the green, red, and blue laser beams in response to the respective laser driving signals generated by the video signal processor 110. The scanner 130 forms an image by projecting the laser beams generated by the respective laser elements on a screen in response to the scanner driving signal SDS. Each of the green, red, and blue laser elements may be a laser diode that generates the red and blue laser beams in accordance with laser driving signals of green, red, and blue, respectively, and in particular, the green As the laser element 121, it is preferable to use DPSS and AOM for generating a green laser beam according to the green laser driving signal.

8 is a view illustrating a laser projection system for installing and displaying a laser projector according to the present invention on a desk.

Referring to FIG. 8, the laser projector 100 according to the present invention may be embedded under a glass surface in the form of a pin hole on the top of a desk. The laser beam projected by the laser projector 100 is projected onto the unfolded side of the roll screen through the pinhole projection. While the laser projector 100 is not used, the roll screen can be rolled up and stored on the floor of the desk, so that space utilization is high when compared to a conventional LCD or CRT. That is, since only a pinhole is provided on the top of the desk, the roll screen can be used as a monitor, so that the entire top of the desk can be utilized, and space utilization can be maximized without any space restrictions when using a keyboard or a mouse. In this case, in order to prevent the back person from being visible in view of information leakage, etc., a method of coating the back of the roll screen in black may be used.

The laser projector 100 according to the present invention may be installed in a narrow space at an appropriate location in a conference room or home and used as a presentation or a home theater.

Apparatus and method for a micro laser projector according to the present invention can be modified and applied in various forms within the scope of the technical idea of the present invention. For example, although the video signal processor of the above embodiments is preferably used as being one chip, it may be replaced by a combination of several elements in which components are separated as necessary. In addition, in the above embodiments, it is preferable that the red and blue laser elements use a laser diode and the green laser elements use DPSS and AOM, but if necessary, the laser diodes are all laser elements of green, red, and blue colors. It is also possible to use or use DPSS and AOM. After all, the embodiments and drawings are merely for the purpose of describing the details of the invention, and are not intended to limit the scope of the technical idea of the invention, the scope of the present invention is not limited to the claims to be described later and It should be judged to include an even range.

As described above, the apparatus, laser projection system, and method for the ultra-small laser projector according to the present invention provide a projection display on a roll-type screen even in a space-constrained place such as on a desk in an office, such as a CRT or LCD. It is effective in maximizing space saving by eliminating space devoted to using a large monitor.

In addition, in the apparatus, laser projection system and method for a micro laser projector according to the present invention, by using a laser drive signal and a scanner drive signal generated from a video signal, a micro laser device and a micro electro-mechanical system (MEMS) form By driving a 2D (2-dimensional) scanner, compared to LCD (Liquid Crystal Display) or CRT (Color Ray Tube), it is possible to realize a rich color and high image quality due to the laser characteristics with less power consumption.

Claims (17)

A video signal processor configured to generate a laser driving signal and a scanner driving signal for green, red, and blue, respectively, based on the input video signal; A laser generator generating green, red, and blue laser beams in response to the respective laser driving signals; And a scanner configured to project laser beams generated by the laser generator in response to the scanner driving signal, wherein the video signal processor comprises: Generating green, red, and blue video signals, a horizontal synchronizing signal, and a vertical synchronizing signal from the input video signal, and inverting each of the video signals one time period every two horizontal scan periods, green, red, and A video signal interface for generating a blue respective video line inversion signal; A first laser driver configured to generate the red laser driving signal by voltage-current converting the red video line inversion signal; A second laser driver configured to generate the blue laser driving signal by voltage-current converting the blue video line inversion signal; And a scanner driver generating the scanner driving signal from the horizontal synchronizing signal and the vertical synchronizing signal. delete The method of claim 1, wherein the scanner driver, And a horizontal scanner driving signal having a half frequency of the horizontal synchronizing signal by combining the vertical scanner driving signal synchronized with the vertical synchronizing signal to generate the scanner driving signal. 4. The laser projector according to claim 3, wherein the horizontal scanner driving signal is in the form of a sine wave and the vertical scanner driving signal is in the form of a triangular wave. The method of claim 1, wherein the scanner, Laser projector comprising a two-dimensional beam scanning device of the MEMS (Micro Electro-Mechanical System) form. The method of claim 1, The green laser driving signal is a voltage signal for driving the green laser device, And the laser driving signal of each of the red and blue signals is a current signal for driving each of the red and blue laser elements. The method of claim 1, And the laser driving signal of each of the green, red, and blue signals is a current signal for driving the laser elements of each of the green, red, and blue colors. The method of claim 1, wherein the laser generating unit, A green laser device generating a green laser beam in response to the green laser drive signal; A red laser device generating a red laser beam in response to the red laser drive signal; And And a blue laser device for generating a blue laser beam in response to the blue laser drive signal. 9. The method of claim 8, The green laser device includes a Diode-Pumped Solid State (DPSS) for generating a green laser beam and an AOM (Acousto Optic Modulator) for modulating the green laser beam generated from the DPSS according to the green laser driving signal, The red laser device includes a red laser diode generating a red laser beam according to the red laser driving signal, The blue laser device comprises a blue laser diode for generating a blue laser beam according to the blue laser drive signal. 9. The method of claim 8, The green laser device includes a green laser diode for generating a green laser beam according to the green laser driving signal, The red laser device includes a red laser diode generating a red laser beam according to the red laser driving signal, The blue laser device comprises a blue laser diode for generating a blue laser beam according to the blue laser drive signal. The method of claim 1, And the green video line inversion signal generated by the video signal interface is the green laser driving signal. The video signal processor of claim 1, wherein the video signal processor comprises: And a third laser driver configured to generate a signal obtained by voltage-current conversion of the green video line inversion signal as the green laser drive signal. The method of claim 1, wherein the scanner driver, A first circuit for generating a horizontal scanner drive signal having a half frequency of the horizontal sync signal; A second circuit for generating a vertical scanner driving signal having the same frequency as the vertical synchronizing signal; And And a third circuit for synthesizing the horizontal scanner driving signal and the vertical scanner driving signal to generate the scanner driving signal. delete The method of claim 1, Embedding the laser projector under a pinhole on an upper surface of a desk, and projecting the laser beams on a screen. (A) receiving an input video signal; (B) generating a scanner drive signal, a video signal of each of green, red, and blue and a laser drive signal from the input video signal; (C) generating laser beams of green, red, and blue in response to the respective laser drive signals; And (D) projecting the generated laser beams in response to the scanner drive signal, In step (B), green, red, and blue video signals, a horizontal sync signal, and a vertical sync signal are generated from the input video signal, and the respective video signals are temporally performed one time every two horizontal scan periods. Inverting to generate green, red, and blue video line inversion signals, respectively; Generating the red laser driving signal by voltage-current converting the red video line inversion signal; Voltage-current converting the blue video line inversion signal to generate the blue laser driving signal; And generating the scanner driving signal from the horizontal synchronizing signal and the vertical synchronizing signal. 17. The method of claim 16, In the step (C), the green laser diode or a green laser device including a diode-pumped solid state (DPSS) and an acousto optic modulator (AOM) is used to generate a green laser beam according to the green laser driving signal. Generating red and blue laser beams according to the red and blue laser driving signals using red and blue laser elements each including a diode; Projection display method comprising a.

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