KR100754464B1 - Display apparatus having a laser diode array - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device having a laser diode array configured to reflect laser light by means of a rotating polygon reflector having a cross section rather than a regular polygon.

The present invention includes a main controller 200 for generating data and control signals for displaying an image on a screen 500 according to image data input from the outside; A diode array 300 having a plurality of laser diodes 310 and 311 for irradiating laser light according to data generated by the main controller 200; It is rotatably installed, the outer surface has a configuration including a polygonal rotating polygon mirror consisting of mirrors (410, 420) for reflecting each laser beam projected from the laser diode (310,311); At least one surface of the outer surface of the rotary mirror 400 is inclined at a predetermined angle with the rotation center line O of the rotary mirror 400. According to the present invention, even if the position of the screen is closer or somewhat farther than the reference distance, the aspect ratio of the characters, images, etc. drawn on the screen is kept constant, the advantage that the resolution of the image implemented on the screen is further improved have.

Laser Diodes, Arrays, Displays, Rotating Mirrors, Lasers

Description

Display apparatus having a laser diode array

1 is a block diagram of a display device having a conventional laser diode array.

FIG. 2A is a diagram illustrating a state in which laser light generated by the display device of FIG. 1 is projected onto a flat screen at a reference distance; FIG.

FIG. 2B is a view showing a state in which the laser light generated by the display device of FIG. 1 is projected onto a flat screen farther than a reference distance. FIG.

Figure 3a is a state diagram showing the characters projected on the screen at a reference distance by a conventional display device.

Figure 3b is a state diagram showing the characters projected on the screen located farther than the reference distance by a conventional display device.

4 is a block diagram of a preferred embodiment (first embodiment) of a display device having a laser diode array according to the present invention.

Figure 5a is a perspective view showing the configuration of a rotating multi-faceted mirror which is the main portion of the embodiment of the present invention.

FIG. 5B is a sectional view taken along the line AA ′ of FIG. 5A; FIG.

FIG. 5C is a sectional view taken along the line B-B 'shown in FIG. 5A; FIG.

Figure 5d is a cross-sectional view showing the installation state of the odd-numbered mirror constituting the rotating multi-face mirror of the embodiment of the present invention.

Figure 5e is a cross-sectional view showing the installation state of the even-numbered mirror constituting the rotating multi-face mirror of the embodiment of the present invention.

Figure 6a is a use state showing a state in which the laser light is projected on the flat screen positioned at the reference distance through a preferred embodiment of the display device according to the present invention.

Figure 6b is a use state showing a state in which the laser light is projected on a flat screen located farther than the reference distance through a preferred embodiment of the display device according to the present invention.

Figure 7a is a use state showing a state in which a laser beam is projected on a flat screen positioned at a reference distance to form a character through a preferred embodiment of the display device according to the present invention.

Figure 7b is a use state showing a state in which a laser beam is projected on a flat screen positioned farther than the reference distance to form a character through a preferred embodiment of the display device according to the present invention.

8 is a use state showing a state in which a laser beam is reflected by a rotating polyhedron constituting a preferred embodiment of the display device according to the present invention to represent an image on a screen.

Fig. 9A is a configuration diagram showing an arrangement of diode arrays constituting a second embodiment of the present invention.

Fig. 9B is a diagram showing the arrangement of the diode array constituting the third embodiment of the present invention.

Fig. 9C is a diagram showing the arrangement of the diode arrays constituting the fourth embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

100: computer 200: main controller

210: communication circuit 220: main controller processor

230: main memory 240: encoder

250: motor driver 260: laser diode driver

300: diode array 310, 311: laser diode

320: fixed holder 330: spring

340: laser beam projection angle adjustment screw 400: rotating mirror

410,420. Mirror 500: Screen

510. Even lines 520. Even lines

M. Motor

The present invention relates to a display device, and more particularly, includes a plurality of laser diodes (LDs) arranged in one or more rows to scan laser light and a polygon reflector reflecting the laser light. The cross-section of a rotating polygonal mirror relates to a display device having a laser diode array configured to have a shape other than a regular polygon.

In general, an LED billboard using a light emitting diode (LED) is mainly used as a conventional outdoor billboard. LED is a diode that emits excess energy as light when the injected electrons and holes recombine, and there are red light emitting diodes using GaAsP and green light emitting diodes using GaP. It is used in display, small number / letter display element, light source for optical coupling element, etc.

When these LEDs are used in billboards for outdoor advertising, quite a lot of LEDs are needed except for very small billboards. Therefore, when manufacturing a large display board, it is necessary to considerably increase the number of LEDs, and thus, there is a disadvantage in that the power consumption increases accordingly. , Numbers can be displayed, so there is a difficulty in maintenance, and accordingly a maintenance cost is also required. In addition, in the case of a large display board, as it is known that a large number of LEDs are required, the manufacturing cost of the display board is also high, which leads to the difficulty of purchasing a display board at a high price.

Accordingly, in recent years, researches on display devices using diode arrays for reducing the size of the display device and reducing power consumption by displaying an image on a screen using a diode array and a rotating reflecting plate have been conducted.

With reference to the contents of Korean Patent Application Publication No. 2001-0088019 (Application Date; March 10, 2000, Application No .: 10-2000-0011968, Name of the Invention; Laser Display Device), which is one of the related arts, A display apparatus using a conventional diode array will be briefly described.

1 is a block diagram of a display device having a conventional laser diode array.

When the image data to be projected on the screen 30 is input, the conventional display apparatus recognizes the position of the rotating mirror 24 and displays the image on the screen 30 according to the position information of the mirror 24. A controller 10 for generating data and a control signal for controlling the position of the mirror 24 according to the control signal generated by the controller 10, and a laser beam corresponding to the data generated by the controller 10. It consists of a diode array scan module 20 that generates light and projects it onto the screen 30.

At this time, the diode array scan module 20, the automatic power control unit 21 for stably oscillating the laser according to the image data output from the controller 10, and the laser under the control of the automatic power control unit 21 A diode array 22 arranged with a plurality of laser diodes for projecting light, a convex lens portion 23 arranged with a plurality of convex lenses for making a laser beam output from the diode array 22 into a parallel beam, A mirror 24 for reflecting the laser beam transmitted by the convex lens unit 23 to be scanned on the screen 30, a motor 25 for rotating the mirror 24, and a position of the mirror 24. And an encoder 26 for detecting a signal and a sensor 27 for detecting a signal for outputting the output signal of the encoder 26 to a mirror position value.

FIG. 2 is a diagram illustrating a case where laser light is projected on a flat screen at intervals of 1 degree over 90 degrees using one of the laser diodes constituting the diode array of FIG. 1, and (a) is a light source. (B) shows the case where the laser beam is projected on the flat screen located farther than the reference distance from the light source.

Referring to (a) and (b) of FIG. 2, the lateral length a 'of the laser light projected on the flat screen 52 located farther than the reference distance from the light source 40 is referred to as the light source 40. It can be seen from that that it is larger than the lateral length a of the laser light projected onto the flat screen 50 located at the reference distance.

Therefore, according to the display device having the diode array as shown in Fig. 1, when the position of the screen is slightly changed from the display device (i.e., from the mirror (light source)), the longitudinal shape of the characters, images, etc. projected on the screen is changed. While maintaining a constant size regardless of the change in position, the laser light reflected from the mirror (24 in Fig. 1) is designed to be incident perpendicularly to the screen surface, so that even if the position of the screen is changed slightly, The size does not change), and the transverse shape becomes relatively longer or shorter as the position of the screen moves away from or near the display device, resulting in characters, images, etc. that appear on the screen depending on how far away the screen is from the display device. The aspect ratio changes. In other words, as the screen moves away from the display device, the aspect ratio (lateral size / vertical size) of characters and images drawn on the surface becomes larger.

3 is a diagram illustrating characters projected onto a screen by a conventional display apparatus, wherein (a) is a character appearing on a screen located at a reference distance, and (b) is a diagram of a character appearing at a screen located farther than the reference distance. to be.

As shown in Figs. 3A and 3B, the characters projected on the screen 50 positioned at the reference distance have the reference distance while the transverse size, that is, the aspect ratio, maintains the standard ratio with respect to the longitudinal size. It can be seen that the characters projected on the screen 52 located at a farther distance have a larger transverse side, i.e., an aspect ratio, with respect to the longitudinal side, so that the characters on the screen 52 are expanded laterally and displayed. have.

As described above, in the conventional apparatus, there is a problem in that aspect ratios of characters, images, etc. projected on the screen are not kept constant, and when the image is projected on a screen located at a long distance, there is a problem that the sharpness of the image is lowered.

SUMMARY OF THE INVENTION An object of the present invention is to provide a laser diode array configured to reflect at least one surface of a plurality of outer surfaces forming a facade with a rotating polyhedron that is not parallel to a center of rotation to reflect the laser light emitted from the plurality of laser diodes to the screen. It is to provide a display device.

In order to achieve the above object, a display device having a laser diode array according to the present invention includes: a main controller for generating data and control signals for displaying an image on a screen according to image data input from an external device; A diode array provided with a plurality of laser diodes for irradiating laser light according to data generated by the main controller; It is rotatably installed, and the outer surface has the structure containing the rotating multifaceted mirror of the polygonal column shape which consists of a mirror which reflects each laser beam projected from the said laser diode; At least one of the outer surface of the rotating mirror and the rotation center line of the rotating mirror are not characterized in that they are not parallel to each other.

A plurality of laser diodes provided in the diode array is characterized in that arranged in a row or a plurality of rows.

The plurality of laser diodes are characterized in that they are arranged in an arc so that each laser beam scanned from the laser diodes converges to one virtual focal point.

The rotating mirror may be located at one virtual focal point where each laser beam scanned from the plurality of laser diodes converges, or may be located between the plurality of laser diodes and the virtual one focal point.

It is characterized in that the cross-sectional area of the top and bottom of the rotating multi-face mirror made of a square pillar shape is different from each other.

The outer surface of the rotating polygon mirror is made of an even number of mirrors, the mirrors of either one of the odd numbered mirrors or the even numbered mirrors are formed in parallel with the center of rotation of the rotating mirror, and the mirrors of the other one of the rotating mirrors It is characterized by being formed to be inclined at a predetermined angle with the center line.

According to the present invention as described above, even if the position of the screen closer or somewhat farther than the reference distance aspect ratio of the characters, images, etc. drawn on the screen is kept constant, there is an advantage that the image implemented on the screen more clear.

Hereinafter, a display device having a laser diode array according to the present invention will be described in detail with reference to the accompanying drawings.

4 is a configuration diagram of a preferred embodiment (first embodiment) of a display device having a laser diode array according to the present invention.

The display device according to the present invention includes a main controller 200 which generates data and a control signal for displaying an image on a screen according to the image data input from a computer (PC) 100 or the like, and the main controller 200. A diode array 300 arranged to project the laser light at an arbitrary projection angle with respect to the horizontal plane so that the laser light is collected onto a virtual focal point f according to the data generated by Rotating mirror 400 to reflect the emitted laser light to the screen 500, and the screen 500 is represented by the image of the laser beam reflected from the rotary mirror 400 to the surface.

Among these, the main controller 200 may include a communication circuit 210 for receiving data such as an image or advertisement data from a computer (PC) 100, and an image received through the communication circuit 210. In order to project the advertisement content onto the screen through the laser light, the main controller processor 220 for calculating the color, brightness, and change over time of the laser diode, and the main controller for storing the values calculated by the main controller processor 220. Memory 230, an encoder 240 for detecting the position and the rotation angle of the motor (M) to know the position of the rotary mirror 400, the position of the motor detected by the encoder 240 and A motor driver 250 for controlling the rotation of the motor M to project an image to a desired position on the screen 500 based on the information on the rotation angle and the data received from the main controller processor 220, and the main controller. Pro Up consists of a laser diode driver 260 which serves to supply power to each of the laser diode the laser diode to allow it to emit light constituting a diode array 300 according to data received in 220. The

On the other hand, in the diode array 300 according to the present invention, the laser diodes are arranged to project the laser light at an arbitrary projection angle with respect to the horizontal plane so that the laser light is collected on a virtual focal point f.

That is, although the laser diodes constituting the conventional diode array are configured to project the laser light in parallel to the horizontal plane so that the laser light is incident on the screen vertically, the laser diode constituting the diode array 300 according to the present invention. They are configured to have arbitrary projection angles with respect to the horizontal plane so that the projected laser light can be collected on one virtual focal point f.

As described above, in the present invention, the laser light is emitted at an arbitrary projection angle with respect to the horizontal plane so that the laser lights emitted from the diode array 300 can all be collected on one virtual focal point f. Thus, when the laser light emitted from the diode array 300 is projected onto the screen 500 after being reflected by the rotating mirror 400, the laser light emitted from the diode array 300 has an arbitrary projection angle. And projected.

Referring to FIG. 4, it is understood that each of the laser diodes constituting the diode array 300 is mounted such that the projection angle α of the laser light with respect to the horizontal plane (a) decreases slightly from the upper end portion of the diode array 300 toward the center portion. Can be.

Among the laser diodes constituting the diode array 300, the first laser diode 310 located first at the upper end and the second laser diode 311 located second at the upper end have their projection angles α1 and α2, respectively. The laser beam emitted from the first laser diode 310 and the laser light emitted from the second laser diode 311 meet at one focal point f formed in the virtual space. In this case, α1 is a larger value than α2.

On the principle as described above, although not shown, the projection angle α gradually decreases from the upper end portion of the diode array 300 to the center portion thereof, and finally becomes substantially parallel to the horizontal plane (α ≒ 0) at the center portion. The projection angle α becomes larger toward the lower end of the diode array 300 again. That is, the projection angle of the upper end of the diode array 300 and the projection angle of the lower end of the diode array 300 are configured to be symmetrical.

Therefore, the laser lights emitted from each laser diode form one focal point f in the virtual space. 4 illustrates a case in which the laser beams projected from the diode array 300 form one focal point f on the rotating mirror 400.

In this case, reference numeral 320 in the diode array 300 denotes a laser diode fixing holder for fixing each laser diode mounted on the diode array 300, and reference numeral 330 denotes a laser diode. A spring that makes it possible to arbitrarily adjust the projection angle, and "340" represents a laser beam projection angle adjustment screw for fixing the spring 330 after adjusting the projection angle of the laser diodes.

On the other hand, the rotary mirror 400 is a device for reflecting the laser light emitted from the diode array 300 to the screen 500, and rotates by the action of the motor (M) mounted on the lower end, the motor ( M) operates under the control of the motor driver 250.

Rotating mirror 400 comprises, for example, several plane mirrors (e.g., six plane mirrors for an octagonal reflector, sixteen plane mirrors for a hexagonal reflector), and fires with one of these reflectors. The laser light is reflected on the surface and then projected onto the screen 500. Since the rotating mirror 400 is in a rotating state, the laser light is projected laterally on the screen 500.

At this time, when the rotary mirror 400 is eight angles, the laser light is projected to the screen 500 over a 90-degree length from a light source (that is, the focus of the laser light projected on the rotary mirror 400). (Viewing Angle 90 Degrees) When the rotating mirror 400 is 16 angles, the laser light is projected on the screen 500 at a transverse length over 45 degrees (viewing angle 45 degrees) from the light source.

How many squares the rotatable mirror 400 is manufactured is determined in consideration of the size of the billboard (ie, the screen), characters to be drawn on the billboard, an image, and the like, and a viewing angle (a laser beam is projected from a light source). Maximum transverse angle) is determined by 720 / angle.

The rotating mirror 400 is preferably formed so that the cross section has a shape other than a regular polygon. That is, the distance between the center portion and the rotation center of one surface forming the outer surface is formed differently from the distance between the center portion and the rotation center of the other adjacent surface.

5A to 5E are shown in detail the configuration of the rotating multi-face mirror constituting the embodiment of the present invention. That is, a perspective view of a rotating polyscopy is schematically illustrated in FIG. 5A, and a cross-sectional configuration of A-A 'and B-B' portions of the rotating polyscopy illustrated in FIG. 5A is illustrated in FIGS. 5B and 5C, respectively. And Fig. 5E shows, in side cross-section, the odd-numbered mirrors and even-numbered mirrors, respectively, which constitute the rotary polyhedron shown in Fig. 5A.

As shown in these figures, the rotating multi-face mirror 400 is configured so that the cross-sectional areas of both ends are different from each other. That is, the cross-sectional size of the upper end and the lower end of the rotating multi-face mirror 400 installed to have a predetermined length up and down is different from each other. More specifically, the upper end of the rotating mirror 400 is formed to have a regular polygon (see Fig. 5b), the lower end is not formed as a regular polygon (see Fig. 5c).

The outer surface of the rotating mirror 400 is made of an even number of mirrors (410,420). That is, the rotating mirror 400 has an appearance by repeating odd-numbered mirrors 410 and even-numbered mirrors 420.

And, the upper end of the rotating mirror 400 has a regular polygonal cross section as shown in Figure 5a. Therefore, the distance R1 between each center portion P1 of the odd-numbered mirror 410 and the rotation center line O of the rotating mirror 400 is rotated with each center portion P2 of the even-numbered mirror 420. It is the same as the distance (R1) with the rotation center line O of the multi-face mirror 400.

On the other hand, the lower end of the rotary mirror 400, as shown in Figure 5b, the distance (R1) between each central portion (P1) of the odd-numbered mirror 410 and the rotation center line O of the rotary mirror (400) is Each center portion P2 of the even-numbered mirror 420 is different from the distance R2 between the rotation centerline O of the rotating mirror 400.

In more detail, an outer surface of the rotating mirror 400 is an odd-numbered mirror 410 formed at a relatively far distance from the rotation center line O, and an even number formed at a relatively close distance from the rotation center line O. It consists of a repetition of the mirror 420. Therefore, the distance R1 between the center portion P1 of the odd-numbered mirror 410 and the rotation center line O is the distance R2 between the center portion P2 of the even-numbered mirror 420 and the rotation center line O. Longer than)

As such, the cross-sectional area 400 of the rotating mirror 400 gradually decreases toward the lower side as shown in FIG. 5A, and the state of the rotating mirror mirror 400 is illustrated in detail in FIGS. 5D and 5E, respectively.

At least one of the outer surface of the rotating mirror 400 and the rotation center line O of the rotating mirror 400 is formed not parallel to each other, more specifically, the odd-numbered mirrors of the rotating mirror 400 The mirrors of either one of the 410 or the even-numbered mirrors 420 are formed in parallel with the rotation center line of the rotating polygon mirror 400, and the mirrors of the other side of the mirror with the rotation center line O of the rotating mirror mirror 400. It is formed to be inclined at an angle.

FIG. 5D illustrates a case where the odd-numbered mirrors 410 of the rotating polygon mirror 400 are formed in parallel with the rotation center line O of the rotating mirror mirror 400, and FIG. 5E illustrates the rotating mirror mirror 400. It is illustrated that even-numbered mirrors 420 are formed to be inclined by a predetermined angle δ with the rotation center line O of the rotating polygon mirror 400.

As such, a part of each mirror formed on each outer surface of the rotating mirror 400 is formed in parallel with the rotation center line O, and the other part is formed to be inclined at a predetermined portion, and the image implemented on the screen 500 overlaps. Since it is expressed as a picture, the resolution of the image increases.

Hereinafter will be described the operation of the display device having a laser diode array according to the present invention as described above.

First, as shown in FIG. 4, when image data is input from an external computer (PC) 100 or the like, the main controller 200 generates data and control signals for displaying an image on a screen. In accordance with the data generated by the controller 200, the laser diodes 310 and 311 of the diode array 300 scan the laser light.

The laser light scanned by the diode array 300 is scanned to converge to one virtual focal point f. That is, since the laser diodes 310 and 311 constituting the diode array 300 are configured to have arbitrary projection angles with respect to the horizontal plane, the projected laser light is collected on a virtual focal point f as shown.

The laser light scanned by the diode array 300 is reflected by the rotating polygon mirror 400. At this time, the rotary mirror 400 is driven by a motor (M) provided on the lower side, the rotation of the motor (M) is controlled by the motor driver 250.

The laser light reflected by the rotating mirror 400 is projected onto the screen 500 to realize an image, and this state is illustrated in FIGS. 6A and 6B, respectively. That is, FIG. 6A illustrates a case where the laser light is projected on a flat screen positioned at a reference distance from the light source, and FIG. 6B illustrates a case where the laser light is projected on a flat screen located farther than the reference distance from the light source.

In more detail, the transverse side length (a ′ in FIG. 6B) of the laser beam projected on the flat screen 500b located at a distance L2 farther from the rotation polygon mirror 400 than the reference distance L1 is a rotation mirror mirror ( It is larger than the lateral length (a in FIG. 6A) of the laser light projected onto the flat screen 500a located at the reference distance L1 from 400. In other words, it can be seen that the lateral length of the laser light projected on the screen becomes longer as the screen moves away from the light source.

At this time, the longitudinal length (b ′ of FIG. 6B) of the laser light projected on the flat screen 500b located at a distance L2 farther from the rotation polygon mirror 400 than the reference distance L1 is also the rotation mirror mirror 400. It can be seen from the larger than the longitudinal length (b in Fig. 6a) of the laser light projected on the flat screen 500a located at the reference distance (L1).

Therefore, according to the present invention, since the longitudinal length of the laser light projected on the screen also becomes longer as the screen moves away from the light source, even if the position of the screen is slightly changed from the display device, characters, images, etc. appearing on the screen have a constant aspect ratio. do.

This is because each of the laser diodes constituting the diode array emits a laser beam with the rotating multi-facet mirror 400 so as to have a different projection angle from the horizontal plane to form one focal point in the virtual space. Therefore, even if the position of the screen is slightly closer or further away from the rotation mirror mirror 400, since the laser light projected to the longitudinal side of the screen is also projected to the screen at a constant angle as the laser light projected to the transverse side of the screen, the resulting As a result, aspect ratios of characters, images, etc. appearing on the screen are kept constant even if the position of the screen is changed.

7A and 7B specifically illustrate the characters projected onto the screen by the display device according to the present invention. That is, FIG. 7A shows the characters appearing on the screen located at the reference distance, and FIG. 7B shows the states of the characters appearing on the screen located farther than the reference distance.

As shown, it can be seen that the characters projected on the screen 500a positioned at the reference distance and the characters projected on the screen 500b positioned farther than the reference distance have a constant aspect ratio.

As a result, according to the display device having the laser diode array according to the present invention, the screen 500 is configured by configuring the diode array 300 such that the laser lights emitted from the diode array form a focal point f in a virtual space. ) Even if the position is closer or somewhat farther than the reference distance, it is possible to maintain a constant aspect ratio of the characters, images, etc. drawn on the screen 500.

In addition, when installing the rotary polygon mirror 400 so that the laser light emitted from the diode array 300 to form a focus on the rotary mirror 400, the vertical of the diode array 300 as in the prior art The length of the longitudinal side of the rotary face mirror 400 is small enough to form the virtual focal point f on the surface thereof without the need to form the longitudinally rotated mirror mirror 400 in correspondence with the length. Can be reduced to

8 illustrates a state in which an image is implemented on a screen by a display device having a laser diode array according to the present invention. That is, the image implemented on the screen 500 is an image having an improved resolution compared to the case having a regular polygonal cross section because the rotating mirror 400 is composed of a cross section rather than a regular polygon.

More specifically, the outer surface of the rotating mirror 400 is composed of a plurality of mirrors (410, 420), each of these mirrors (410, 420) is made of an even number, the odd odd mirror 410 and the even number The mirrors 420 have different distances R2 and R1 from the rotation center line O. That is, the odd-numbered mirror 410 is parallel to the rotation center line O of the rotating polygon mirror 400, while the even-numbered mirror 420 is parallel to the rotation center line O of the rotating polygon mirror 400. It is formed to be inclined without.

Therefore, the laser beams reflected by the odd-numbered mirror 410 and the even-numbered mirror 420 of the rotary mirror 400 and projected on the screen 500 are different from each other in their arrival positions. For example, the laser light reflected by the odd-numbered mirror 410 implements an image on the odd line 510 on the screen 500, while the laser light reflected by the even-numbered mirror 420 is screened. An image is implemented on the even line 520 on 500. That is, the laser light reflected by the even-numbered mirror 420 implements each image between the plurality of odd-numbered lines 510 on the screen 500 implemented by the odd-numbered mirror 410.

More specifically, when the laser light reflected by the odd-numbered mirror 410 expresses data of 256 * 64 pixels in the odd-line 510 on the screen 500, the even-numbered mirror 420 Since the reflected laser light also expresses 256 * 64 pixels of data on the even line 520 on the screen 500, one image data, that is, the pixel of the odd line 510 and the even line 520, is combined. One image of 256 * 128 is implemented.

Therefore, the resolution of the image represented on the screen 500 can be improved by about twice as compared to the case of using a rotating polygonal mirror whose cross section is a regular polygon. That is, when about 64 laser diodes 310 and 311 are arranged in one diode array 300, if a rotating polygon mirror having a regular cross section is used, the screen 500 should represent an image using only 64 rows of laser light lines. In the case where the cross section is made of a rotating polygonal mirror 400 having a double outer surface instead of a regular polygon as in the present invention, the screen 500 has a result of expressing an image with 128 rows of laser light lines.

The scope of the present invention is not limited to the above-exemplified embodiments, and many other modifications based on the present invention will be possible to those skilled in the art within the above technical scope.

For example, various arrangements of the laser diodes 310 and 311 provided in the diode array 600 may be implemented. That is, as long as the laser beams scanned from the plurality of laser diodes 310 and 311 are converged to one virtual focal point f, various configurations may be possible, and the configuration of such another embodiment is illustrated in FIGS. 9A, 9B, and 9C. Are shown respectively.

First, referring to the diode array 700 of the second embodiment illustrated in FIG. 9A, as shown in FIG. 4 (first embodiment), the laser diodes 310 and 311 are arranged in a line in the fixed holder 320. Rather, a plurality of laser diodes 711 are arranged in an arc shape.

That is, the laser beams scanned by the plurality of laser diodes 711 are arranged in a bow-like shape, symmetrically bent up and down so that each laser beam converges to one virtual focal point f.

In more detail, the laser diode units 710 constituting the diode array 700 are arranged in an arc shape separated from each other, and such a laser diode unit 710 includes a rotating polyhedron 720. A laser diode 711 for emitting a laser beam and a fixed holder 712 for fixing the laser diode 711 and transmitting various electrical signals related to laser beam emission to the laser diode 711. Consists of. At this time, the fixed holder 712 is an overall bow-shaped image so that the laser beams emitted from the respective laser diodes 711 constituting the diode array 700 converge to one focal point f in the virtual space. The bottoms are arranged in a symmetrically curved form.

9B shows a diode array according to a third embodiment of the present invention, which illustrates the case where the laser diodes are arranged in two rows. That is, the plurality of laser diodes constituting the display device of the present invention may be arranged in a single row or a plurality of rows, and the case in which the plurality of laser diodes are arranged in two rows is illustrated.

As shown, the plurality of laser diode units 812 arranged in the diode array 810 in the first row and the plurality of laser diode units 822 arranged in the diode array 820 in the second row are arranged to cross each other. The laser diode units 822 arranged in the diode array 820 in the second row are arranged to be centered between the laser diode units 812 arranged in the diode array 812 in the second row. .

According to the third embodiment, there is an advantage that the resolution of the image represented on the screen can be improved by twice than using only one diode array. For example, when arranging about 64 laser diode units in one diode array, the screen should represent an image with only 64 rows of laser light lines. However, when the diode array is additionally provided as shown in FIG. 9, the screen has 128 rows of laser diodes. Since the image can be represented by the light line, the result can be doubled the resolution of the image displayed on the screen. In this case, reference numeral “830” denotes a rotating multifaceted mirror.

FIG. 9C is a diagram illustrating a diode array according to a fourth embodiment of the present invention, and illustrates a case where the rotating mirror mirror 920 is disposed in front of a position where a virtual focal point f is formed (FIG. 8). Same configuration). That is, the rotary mirror 400 is an imaginary focal point f that each laser beam scanned from the plurality of laser diodes 310 and 311 converges as illustrated in the first embodiment (Fig. 4, etc.). In addition to being installed on, the plurality of laser diodes 310 and 311 may be positioned between the virtual one focal point f or between the screen 500 and the virtual one focal point f. The case where it is located between a laser diode and a virtual focal point is illustrated.

As shown, in this embodiment, the rotating mirror mirror 920 is disposed in front of a position where a virtual focal point f is formed. In this case, in order to sufficiently perform the role of reflecting the laser light projected from the diode array 900 to the screen (not shown), the longitudinal size of the rotating mirror mirror 920 is a virtual one of the rotating mirror mirror. It would have to be larger than the longitudinal size in the other embodiment above that was positioned at the position where the focal point f is formed.

However, according to this embodiment, the distance between the rotating mirror 920 and the diode array 900 can be reduced than in the other embodiments (in other embodiments, the distance between the rotating mirror and the diode array is maintained by the focal length). ), The overall size of the display device can be efficiently reduced. Here, reference numeral 910 denotes a laser diode unit, reference numeral 911 denotes a laser diode, and reference numeral 912 denotes a fixed holder.

According to the display device with the laser diode array according to the present invention, the position of the screen is closer or somewhat closer to the reference distance by configuring the diode array such that the laser lights emitted from the diode array form a focal point on the rotating polyscopy. Even if the distance is far, the aspect ratio of the characters, images, etc. drawn on the screen can be kept constant.

In addition, since the laser beams emitted from the diode array are reflected at one focal point on the rotating polyhedron, the rotating polyhedron does not need to be vertically lengthened corresponding to the vertical length of the diode array as in the prior art, and consequently, the size of the display device. Can be reduced than before.

In addition, in the present invention, the rotating multi-faceted mirror reflecting the laser light is configured to have a cross section instead of a regular polygon. That is, the outer surface of the rotating mirror comprises an even number of mirrors, and mirrors of at least one of the odd-numbered mirrors and the even-numbered mirrors are formed to be inclined at a predetermined angle with the rotation centerline of the rotating mirror.

Therefore, since one image is formed by overlapping each laser beam reflected by the odd-numbered mirrors and the even-numbered mirrors, the resolution of the image projected on the screen is improved.

Claims (6)

A main controller for generating data and control signals for displaying an image on a screen according to the image data input from the outside; A diode array provided with a plurality of laser diodes for irradiating laser light according to data generated by the main controller; It is rotatably installed, and the outer surface has the structure containing the rotating multifaceted mirror of the polygonal column shape which consists of a mirror which reflects each laser beam projected from the said laser diode; At least one of the outer surface of the rotating mirror, and the center of rotation of the rotating mirror is a display device having a laser diode array, characterized in that not parallel to each other. The display apparatus according to claim 1, wherein the plurality of laser diodes provided in the diode array are arranged in one row or a plurality of rows. The method of claim 1 or 2, wherein the plurality of laser diodes, A display device having a laser diode array, wherein each laser beam scanned from the laser diode is arranged in an arc so as to converge to one virtual focal point. The rotating rotary mirror according to claim 1 or 2, And each laser light scanned by the plurality of laser diodes is positioned at one virtual focal point that converges or between the plurality of laser diodes and the one virtual focal point. The display apparatus according to claim 1, wherein the cross-sectional areas of the upper and lower ends of the rotating polygon mirror having the polygonal pillar shape are different from each other.  According to claim 1 or 5, wherein the outer surface of the rotating mirror is made of an even number of mirrors, The laser diode, characterized in that the mirrors on either side of the odd-numbered mirrors or the even-numbered mirrors are formed parallel to the rotation center line of the rotating polyhedron, and the mirrors of the other side are formed to be inclined at an angle with the rotation center line of the rotating polyhedron. Display device having an array.

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