KR20040078281A - Laser Projector and Control Method of The Same - Google Patents

Abstract

PURPOSE: A laser projector and a method for controlling the laser projector are provided to easily magnify and control a picture projected by the projector. CONSTITUTION: A laser projector(200) includes an image processor(260), a laser driver(270), and a laser generator(280). The image processor processes an input video signal into digital RGB signals. The laser driver synthesizes the RGB signals to output a laser signal. The laser generator scans the laser signal on a screen(100). The laser projector further includes the first and second galvanometers(230,250), the first and second drivers(220,240), and a controller(210). The first galvanometer controls a scanning direction of a laser beam generated by the laser generator. The second galvanometer controls a scanning direction of the laser beam scanned through the first galvanometer. The first and second drivers respectively drive the first and second galvanometers. The controller respectively determines scanning direction control angles of the first and second galvanometers, corresponding to an adjusted picture size, when a user adjusts the picture size, and controls the first and second drivers to control the scanning direction of the laser beam based on the determined scanning direction control angles.

Description

Laser Projector and Control Method of The Same

The present invention relates to a laser projector, and more particularly, to a laser projector and a method of controlling the same, which are easier to enlarge and control a screen of a projector.

Currently, due to the limitation of the screen size of the existing TV, the development of a projection display system is prominent while the development and release of a large screen, ultra-thin display is active.

In such a projection display system, development and deployment of a projector using a display element such as a cathode ray tube (CRT), a liquid crystal display (LCD), a liquid crystal on silicon (LCoS), or a digital light processing (DLP) It is rapidly increasing, which is not only universally used to display the output screen of a personal computer on a screen during presentations in schools, corporations, public offices, etc., but also for home-theater at home. It is becoming.

In addition, a projector using a laser is also being developed. Such a laser projector has been initially developed for a laser show.

As shown in FIG. 1, the laser projector 10 expresses an image by a beam. The laser projector 10 scans a laser beam on a screen 20 line by line and line by line in a similar principle to a cathode ray tube (CRT). When a screen is constructed and scanning of a certain line (that is, one screen) is completed, a scanning method is used to return to the position of the first line and form the next screen.

Referring to the laser projector according to the prior art of the scanning method, as shown in Figure 2, to process the image signal input from the outside in the digital format R (Red), G (Green), B (Blue) signal An image processor 14, a laser driver 15 for synthesizing the R, G, and B signals output from the image processor 14 and outputting the laser signal, and a laser signal output from the laser driver 15 A laser generator 16 for scanning in a form, a galvanometer 13 for adjusting the scanning direction of the laser beam output from the laser generator 16, the galvanometer 13 according to the user's screen size setting A control unit 11 for determining a rotation angle of the control unit and outputting a corresponding control signal, and a driving unit for driving the galvanometer 13 under the control of the control unit 11 so as to display a screen size set by a user. It consists of 12 pieces.

In this case, the galvanometer 13 controls the X-axis galvanometer 13a and the vertical direction for controlling the horizontal direction of the laser beam output from the laser generator 16 as shown in FIG. And a rotatable mirror (a, b) provided at the ends of the X-axis and Y-axis galvanometers (13a, 13b), respectively. By rotating, the laser beam reflected through the mirrors a and b is adjusted to realize an image having the coordinates of the horizontal axis (X axis) and the vertical axis (Y axis) of the screen 20.

Here, the X-axis and Y-axis galvanometers (13a, 13b) is a kind of motor that can precisely adjust the angle of the mirror (a, b), the larger the rotation angle of the mirror (a, b) screen The size of the screen displayed at 20 increases.

That is, the rotation angles of the X-axis and Y-axis galvanometers 13a and 13b according to the screen size are configured as a look up table and stored in an internal memory (not shown) of the controller 11.

Therefore, when the user sets the size of the screen to be displayed on the screen 20 through a predetermined external input means (not shown), the control unit 11 corresponds to the X-axis and Y-axis galvans corresponding to the screen size set by the user. The rotation angles of the notches 13a and 13b are determined.

The controller 11 controls the driver 12 according to the determined rotation angle, and the driver 12 supplies current to the galvanometer 13 corresponding to the determined rotation angle to each X axis and Y. The mirrors a and b of the axial galvanometers 13a and 13b are rotated.

That is, the X-axis and Y-axis galvanometers 13a and 13b rotate the mirrors a and b by the respective rotation angles to change the reflection path of the laser beam generated by the laser generator 16 to change the image. The image signal output from the laser driver 15 through the processor 14 is projected onto the screen 20.

For example, the mirror a of the X-axis galvanometer 13a is continuously rotated by the rotation angle to scan a row of horizontal images, and then the mirror of the Y-axis galvanometer 13b ( b) is rotated by an angle of about one pixel to scan the horizontal image of the next line. This process is repeated until the rotation angle of the Y-axis galvanometer 13b determined by the controller 11 is reached.

The screen size of the above-described laser projector is determined according to the maximum rotation angles of the X- and Y-axis galvanometers 13a and 13b mirrors a and b. However, the galvanometer 13, which rotates the mirrors a and b used in the current laser projector, has a high speed but not a large rotation angle, unlike a motor.

Therefore, in order to obtain a larger screen through the laser projector 10, there is a problem that the distance between the projector 10 and the screen 20 becomes long.

In addition, a projection lens is used as an optical zooming method. In the case of using a projection lens, the design of the lens must be changed or the number of lenses can be further increased in order to increase the size of the maximum screen in focus. Or there is a disadvantage that additional cost is required because of the redesign.

Accordingly, an object of the present invention is to provide a laser projector and a method of controlling the same, which can easily realize enlargement and control of a projector projection screen.

1 is a view showing the principle of a general laser projector

Figure 2 is a block diagram showing the configuration of a laser projector according to the prior art

3 is a view showing the configuration and operation principle of the galvanometer in the prior art

Figure 4 is a block diagram showing the configuration of a laser projector according to the present invention

5 is a view showing the configuration and operation principle of the galvanometer in the present invention

6 is a flow chart showing a control method of the laser projector according to the present invention.

Explanation of symbols for main parts of the drawings

100: screen

200: laser projector 210: control unit

220: first drive unit 230: first galvanometer

240: second driver 250: second galvanometer

230a: 1st X-axis galvanometer 230b: 1st Y-axis galvanometer

250a: 2nd X-axis galvanometer 250b: 2nd Y-axis galvanometer

260: image processing unit 270: laser driver

280: laser generating unit

In order to achieve the above object, a laser projector according to the present invention synthesizes an R, G, and B signal processed by an image processor and an image processor that processes an externally input image signal into a digital format R, G, and B signal. A laser projector including a laser driver for outputting a laser signal and a laser generator for scanning a laser signal output from the laser driver on a screen in a beam form, the laser projector adjusting the scanning direction of the laser beam output from the laser generator. A first galvanometer, a second galvanometer for adjusting the scanning direction of the laser beam scanned through the first galvanometer, first and second drivers for driving the first and second galvanometers, a user When the screen size is adjusted, the scanning direction adjustment angles of the first and second galvanometers corresponding to the adjusted screen size are respectively determined. Depending on the direction angle adjustment consists of a controller for controlling the first and the second driving unit so as to control the scanning direction of the laser beam has its features.

In addition, the laser projector according to the present invention for achieving the above object is an image processing unit for processing the image signal input from the outside in the digital format R, G, B signal, and R, G, B signal processed in the image processing unit A laser projector comprising: a laser driver for synthesizing and outputting a laser signal; and a laser generator for scanning a laser signal output from the laser driver on a screen in the form of a beam, the scanning direction of the laser beam output from the laser generator. A first galvanometer for adjusting, a second galvanometer for adjusting the scanning direction of the laser beam scanned through the first galvanometer during keystone correction, a first for driving the first and second galvanometers and A second driving unit, scanning of the second galvanometer to correct a screen displayed on the screen when a user inputs a keystone correction command; Consists of a controller for controlling the direction adjusting angle have different characteristics.

In addition, the control method of the laser projector according to the present invention for achieving the above object is an image processing unit for processing the image signal input from the outside in the digital format R, G, B signal, and R, G processed by the image processing unit And a laser driver for synthesizing the B signal and outputting the laser signal, a laser generator for scanning the laser signal output from the laser driver on a screen in a beam form, and adjusting a scanning direction of the laser beam output from the laser generator. In the control method of a laser projector having a first and a second galvanometer, when the user adjusts the screen size to determine the scanning direction adjustment angle of the first and second galvanometer corresponding to the adjusted screen size step; Driving the first and second galvanometers in association with the determined scanning direction adjustment angle; And displaying the adjusted size screen by driving the first and second galvanometers.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

Hereinafter, a laser projector and a control method thereof according to the present invention will be described with reference to the accompanying drawings.

Figure 4 is a block diagram showing the configuration of a laser projector according to the present invention, Figure 5 is a view showing the configuration and operation principle of the galvanometer in the present invention, Figure 6 shows a control method of the laser projector according to the present invention. Flow chart.

First, the laser projector according to the present invention, as shown in Figure 4, the image processing unit 260 for processing the image signal input from the outside in the digital format R, G, B signal, and the image processing unit 260 The laser driver 270 for synthesizing the R, G, and B signals and outputting the laser signal as a laser signal, and the laser generator 280 for scanning the laser signal output from the laser driver 270 to the screen 100 in a beam form. In the provided laser projector 200, the first galvanometer 230 for adjusting the scanning direction of the laser beam output from the laser generating unit 280, and scanned through the first galvanometer 230 A second galvanometer 250 for adjusting a scanning direction of a laser beam, first and second drivers 220 and 240 for driving the first and second galvanometers 230 and 250, and a user's screen size To adjust the first and second galvanometers 23 corresponding to the adjusted screen size. A control unit 210 for controlling the first and second driving units 230 and 250 to determine scanning direction adjustment angles of 0 and 250, respectively, and to adjust the scanning direction of the laser beam according to the determined scanning direction adjustment angle. It is configured to include.

In this case, the first and second galvanometers (230, 250) are the first and second X-axis galvanometers (230a, 250a) for adjusting the horizontal scanning direction of the laser beam, and the vertical of the laser beam First and second Y-axis galvanometers 230b and 250b for adjusting the scanning direction and the X-axis and Y-axis galvanometers 230a, 250a, 230b and 250b, respectively, are installed in the X and Y axes. It is composed of mirrors A, a, B, and b for reflecting the laser beam by rotating at the determined scanning direction adjustment angle by driving the axial galvanometers 230a, 250a, 230b, 250b.

In the present invention, as shown in Fig. 5, the screen size in the vertical direction is determined by the rotation angles of the mirrors B and b of the first and second Y-axis galvanometers 230b and 250b (A The screen size in the horizontal direction is determined by the rotation angles of the mirrors A and a of the first and second X-axis galvanometers 230a and 250a (B).

Referring to the operation of the laser projector according to the present invention configured as described above are as follows.

When the user adjusts (enlarges) the size of the screen displayed on the screen 100 through a predetermined input means (not shown), the controller 210 detects the size of the screen and corresponds to the adjusted screen size. The angle of rotation of the notches 230 and 250 is determined.

That is, the controller 210 rotates the mirrors A and B of the first X and Y axis galvanometers 230a and 230b and the second X and Y axis galvanometers 250a according to the screen size. , And determine the rotation angles of the mirrors (a, b) of the 250b), and the rotation angle information of the first and second galvanometers 230 and 250 according to the screen size is shown in Table 1 below according to experimental values during production. Tables are stored in the same configuration.

Screen size First galvanometer Second galvanometer X-axis mirror Y-axis mirror X-axis mirror Y-axis mirror 600 * 800 XX YY XX YY 800 * 800 XX YY XX YY ... ... ... ... ... XX * YY XX YY XX YY

The control unit 210 controls the driving of the first and second driving units 220 and 240 so that the first X and Y axis galvanometers 230a and 230b and the second X axis according to the determined rotation angle. And controlling the scanning direction of the laser beam output from the laser generator 280 by controlling the rotation of the mirrors A, B, a, and b by driving the Y-axis galvanometers 250a and 250b, respectively. Displays the image in the desired screen size.

In this case, the first and second driving units 220 and 240 may supply a current corresponding thereto so that the mirrors A, B, a, b may be rotated by the determined rotation angle under the control of the controller 210. Supply to the first and second galvanometer (230, 250).

The mirrors A and a of the first and second X-axis galvanometers 230a and 250a are continuously rotated by the corresponding rotation angle to scan a row of horizontal images, and thereafter, the first and second X-axis galvanometers 230a and 250a. The mirrors B and b of the Y-axis galvanometers 230b and 250b are rotated by an angle corresponding to about one pixel to scan the horizontal image of the next row. This process is repeated until the rotation angles of the first and second Y-axis galvanometers 230b and 250b determined by the controller 210 are reached.

According to the present invention, the adjustment range of the screen size is large by changing the scanning direction (scanning path) of the laser beam through the first galvanometer 230 using the second galvanometer 250.

The control method according to the laser projector of the present invention described above is as follows.

As shown in FIG. 6, the user adjusts the screen displayed on the screen 100 to a desired screen size through a predetermined menu of the laser projector 200 (S100).

When the user completes the screen size adjustment, the controller 210 recognizes the rotation angle of the first and second galvanometers 230 and 250 corresponding to the adjusted screen size, that is, the first and second X-axis galvans. The rotation angles of the mirrors A, B, a, and b connected to the notches 230a and 250a and the first and second Y-axis galvanometers 230b and 250b are determined (S110).

In addition, the first and second galvanometers 230 and 250 are driven in conjunction with each other according to the determined rotation angles of the mirrors A, B, a, and b to display an image at a screen size desired by the user. Display on (S120 ~ S130).

Accordingly, the present invention changes the scanning direction of the laser beam through the first galvanometer 250 through the second galvanometer 250, that is, the first through the galvanometer 250a of the second X axis. The horizontal scanning direction of the X-axis galvanometer 230a is changed to increase the adjustment range of the horizontal screen size, and similarly, the first Y-axis galvanometer 230b is perpendicular to the first Y-axis galvanometer 230b. By changing the scanning direction of the direction to increase the vertical screen size adjustment range can be further increased to the overall screen size adjustment range.

Example

Another embodiment of the laser projector according to the present invention will be described below.

The construction block diagram according to this is omitted, but the configuration is the same as FIG. 4 of the present invention.

Another embodiment of the laser projector according to the present invention includes an image processor 260 for processing an externally input image signal into R, G, and B signals in a digital format, and R, G, and the like processed by the image processor 260. A laser projector including a laser driver 270 for synthesizing a B signal and outputting the laser signal, and a laser generator 280 for scanning the laser signal output from the laser driver 270 to the screen 100 in a beam form. 200, a first galvanometer 230 for adjusting a scanning direction of the laser beam output from the laser generator 280, and a laser beam scanned through the first galvanometer 230 during keystone correction. The second galvanometer 250 for adjusting the scanning direction of the first and second first and second drivers 220 and 240 for driving the first and second galvanometers 230 and 250, and the user may input a keystone correction command. When input, the screen displayed on the screen 100 is corrected. To the second galvanic is configured to include the furnace controller 210, which controls the scanning direction adjusting angle of the meter 250. The

In the laser projector according to the present invention configured as described above, the second galvanometer 250 is used for keystone correction for correcting a distorted screen in a vertical, left and right trapezoidal shape.

In general, the keystone correction function outputs and projects a trapezoidal image having a lower side by reducing the resolution of the upper side when the screen 100 has a wide trapezoidal shape that is distorted and projected on the screen 100. This method uses the second galvanometer 250 instead of this method since the resolution of the corrected portion (upper side) is reduced.

For example, when a trapezoid-shaped screen having a wider upper side than the lower side is distorted and projected, when the user inputs a keystone correction command, the control unit 210 recognizes this and increases the scanning angle of the lower side that is narrower than the upper side to increase the scanning angle. Scanning through the range allows keystone correction to be made without loss of resolution.

That is, the laser beam generated by the laser generator 280 is scanned through the first galvanometer 230 to display an image on the screen. In this case, when the image displayed on the screen is displayed in a trapezoidal shape, the user The keystone correction command is input through a predetermined menu or input means.

The controller 210 recognizes this and performs keystone correction by changing the scanning direction of the laser beam scanned through the first galvanometer 230 through the second galvanometer 250.

Therefore, the present embodiment additionally configures a keystone correction galvanometer to perform keystone correction without deterioration in resolution during keystone correction.

The laser projector and the control method according to the present invention described above has the following effects.

First, the secondary galvanometer may be additionally configured to change the scanning direction of the laser beam scanned through the primary galvanometer, thereby further increasing the screen size control range. In addition, the projection distance from the screen can be further shortened, thereby reducing the cost by increasing the size of the screen sufficiently without using a separate projection lens or changing the lens design.

Second, when the secondary galvanometer is used exclusively for keystone correction, the reliability of the product can be improved by performing keystone correction without degrading the resolution.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (4)

An image processor for processing an externally input image signal into digital format R, G, and B signals, a laser driver for synthesizing the R, G, and B signals processed by the image processor and outputting the laser signal, and outputting the laser driver. A laser projector having a laser generator for scanning a laser signal on a screen in a beam form, A first galvanometer for adjusting a scanning direction of the laser beam output from the laser generator, A second galvanometer for adjusting a scanning direction of the laser beam scanned through the first galvanometer, First and second drivers for driving the first and second galvanometers, When the user adjusts the screen size, the scanning direction adjustment angles of the first and second galvanometers corresponding to the adjusted screen size are respectively determined, and the scanning direction of the laser beam is adjusted according to the determined scanning direction adjustment angle. And a control unit for controlling the first and second driving units. The method of claim 1, The first and second galvanometer An X-axis galvanometer for adjusting the horizontal scanning direction of the laser beam, a Y-axis galvanometer for adjusting the vertical scanning direction of the laser beam, and connected to the X-axis and Y-axis galvanometer respectively And a mirror for reflecting the laser beam by rotating at the determined scanning direction adjustment angle by driving X and Y axis galvanometers. An image processor for processing an externally input image signal into digital format R, G, and B signals, a laser driver for synthesizing the R, G, and B signals processed by the image processor and outputting the laser signal, and outputting the laser driver. In the laser projector control method comprising a laser generator for scanning the laser signal to the screen in the form of a beam, and the first and second galvanometer for adjusting the scanning direction of the laser beam output from the laser generator, Determining a scanning direction adjustment angle of the first and second galvanometers corresponding to the adjusted screen size when the user adjusts the screen size; Driving the first and second galvanometers in association with the determined scanning direction adjustment angle; And, And displaying the adjusted size screen by driving the first and second galvanometers. An image processor for processing an externally input image signal into digital format R, G, and B signals, a laser driver for synthesizing the R, G, and B signals processed by the image processor and outputting the laser signal, and outputting the laser driver. A laser projector having a laser generator for scanning a laser signal on a screen in a beam form, A first galvanometer for adjusting a scanning direction of the laser beam output from the laser generator, A second galvanometer for adjusting the scanning direction of the laser beam scanned through the first galvanometer during keystone correction; First and second drivers for driving the first and second galvanometers, And a controller for controlling the scanning direction adjustment angle of the second galvanometer so that a screen displayed on the screen is corrected when a user inputs a keystone correction command.