KR100587390B1 - Micro-display apparatus havang means of collecting for laser - Google Patents

Abstract

The present invention relates to a very small laser display device having a plurality of laser diode elements for irradiating laser light and a focusing means having a scanning means for reflecting the laser light to form an image on the screen.

The micro laser display device having the focusing means according to the present invention comprises: a light emitting element array (100) having a plurality of laser diode elements (104) arranged in a row to irradiate laser light; A parallel lens (110) for guiding each of the laser beams irradiated from the plurality of laser diode elements (104) to go straight in parallel in one direction; Focusing means (120) for guiding each laser light traveling in one direction by the parallel lens (110) to pass on one virtual focal point (f); It has a configuration including a scanning means 130 for reflecting the laser light passing through the focusing means 120. The light emitting device array 100 is formed of an ultra-small laser diode (LD wafer) or chip having a rod shape. According to the present invention, since the color laser display device can be manufactured in a very small size, there is an advantage that can be embedded in a small portable device such as a mobile phone or watch.

Display, laser, diode, element

Description

Micro-display apparatus havang means of collecting for laser

1 is a block diagram of a conventional laser display device.

2 is a block diagram showing a schematic configuration of a preferred embodiment of a micro laser display device having a focusing means according to the present invention;

3 is a plan view showing the configuration of a light emitting element array which is a main component of a micro laser display device having a focusing means according to the present invention;

Fig. 4A is a block diagram showing the configuration of the first embodiment of the ultra-small laser display apparatus having the focusing means according to the present invention.

Fig. 4B is a block diagram showing the construction of the second embodiment of the ultra-small laser display apparatus having the focusing means according to the present invention.

Fig. 5A is a block diagram showing the arrangement of the third embodiment of the ultra-small laser display apparatus having the focusing means according to the present invention.

Fig. 5B is a block diagram showing the configuration of the fourth embodiment of the ultra-small laser display apparatus having the focusing means according to the present invention.

Fig. 6A is a block diagram showing the configuration of the fifth embodiment of the ultra-small laser display apparatus having the focusing means according to the present invention.

Fig. 6B is a block diagram showing the configuration of the sixth embodiment of the ultra-small laser display apparatus having the focusing means according to the present invention.

Fig. 7A is a block diagram showing the main structure of a seventh embodiment of an ultra-small laser display apparatus having a focusing means according to the present invention;

Fig. 7B is a block diagram showing the main components of the eighth embodiment of the ultra-small laser display apparatus having the focusing means according to the present invention.

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

100. Light emitting element array 102. Laser wafer

104. Laser diode element 110. Parallel lens

120. Focusing means 122. Convex lens

124. Concave mirror 126. Mirror assembly

128. Flat mirror 130. Scan means

132. Galvano Mirror 132 '. Mirror motor

132 ". Motor shaft 134. Rotating face mirror

134 '. Rotary Motor 134 ". Spindle

140. Screen 150. Computer

200. Main control unit 210. Communication circuit

220. Main control processor 230. Main memory

240. Encoder 250. Motor driver

260. Laser Diode Driver 300. f-Theta Lens

The present invention relates to a display apparatus, and more particularly, a micro laser display apparatus having a plurality of laser diode elements for irradiating a laser light and a focusing means having a scanning means for reflecting the laser light to form an image on a screen. It is about.

1 shows an example of a conventional laser display device.

As shown in the drawing, the laser display device includes first to third lasers (11) (21) (31) for generating and irradiating light having blue (B), green (G), and red (R) wavelengths, respectively. The optical integrated optical system 40 and the optical scanning unit 50 which integrate the light irradiated from each of the first to third lasers 11, 21 and 31 are configured.

The optical integrated optical system 40 includes a total reflection mirror 41 reflecting light of a red (R) wavelength emitted from the third laser 31, and first and second dichroic mirrors 43 and 45. do. The first dichroic mirror 43 transmits light reflected by the total reflection mirror 41 and transmits light of green (G) wavelength emitted from the second laser 21.

Thus, the light of the reflected green (G) wavelength and the transmitted red (R) wavelength of light are integrated. The second dichroic mirror 45 reflects light incident from the first dichroic mirror 43 and transmits light having a wavelength of blue (B) incident from the first laser 11, thereby causing red (R), Light with green (G) and blue (B) colors will travel in the same path.

Further, on the traveling path of the light irradiated from each of the first to third lasers (11, 21, 31), each of the first to third focusing lenses (13), (23), (33), and the first to third Each of the optical modulators 15, 25, 35 is disposed.

The optical scanning unit 50 includes a rotary polygon mirror 51 for linearly scanning incident light and a galvano mirror 55 for scanning the linearly scanned light again to form a scanning beam. . Therefore, the optical scanning unit 50 can implement an image by scanning the light integrated by the optical integration optical system 40 onto the screen 60.

However, the above conventional configuration has the following problems.

That is, since each of the lasers 11, 21, 31 constituting the conventional laser display device is large in size, it is difficult to implement a very small display device mounted on a mobile phone or a portable watch. For example, since the width D1 between one end of the first laser 11 and the third laser 31 becomes about 450 mm, it is difficult to miniaturize.

It is an object of the present invention to provide a micro laser display device having a focusing means in which a plurality of laser diode elements are provided in one or more rows.

Another object of the present invention is to provide an ultra-small laser display apparatus having a focusing means capable of maintaining a constant aspect ratio of an image projected on a screen, no matter what distance the screen is located from the light source.

In order to achieve the above object, the ultra-small laser display device having the focusing means according to the present invention is provided with a plurality of laser diode elements for generating a laser beam in a row, the light emission to irradiate the laser light in accordance with the input image signal An element array; A parallel lens provided at one side of the light emitting element array and configured to guide the respective laser beams irradiated from the plurality of laser diode elements in parallel to each other in one direction; A focusing means provided at one side of the parallel lens and guiding each laser light traveling in one direction by the parallel lens to pass through one virtual focal image; And a scanning means for reflecting the laser beam passing through the focusing means.

A plurality of laser diode devices provided in the light emitting device array is characterized by scanning the laser light integrated with blue (B), green (G), red (R) color.

The light emitting device array is characterized in that the ultra-small laser diode substrate (LD wafer) or chip (chip) having a rod shape.

The focusing means may be a convex lens or a concave mirror that allows the laser light traveling straight by the parallel lens to converge to one virtual focal point.

The focusing means has a configuration including a plurality of planar mirrors corresponding to the respective laser beams going straight by the parallel lens, wherein the plurality of planar mirrors are installed so that each of the laser beams converges to one virtual focal point. It is characterized by.

The scanning means is characterized in that the rotating multi-face mirror or galvano mirror reflecting the laser light scanned from the light emitting element array.

One side of the scanning means is characterized in that the f-theta lens (f-θ Lens) is further provided so that the left and right moving speed of the laser beam scanned on the flat screen reflected by the scanning means is constant.

The rotating mirror has a rotating polygonal pillar shape, and a scan mirror is formed on an outer surface thereof to reflect the laser light.

According to the present invention, since the color laser display device can be manufactured in a very small size, there is an advantage that can be embedded in a small portable device such as a mobile phone or watch.

EMBODIMENT OF THE INVENTION Hereinafter, with reference to an accompanying drawing, the micro laser display apparatus which has the focusing means by this invention is demonstrated.

First, referring to FIG. 2, a schematic main configuration of a micro laser display device having a focusing means according to the present invention will be described.

As shown, the ultra-small laser display device having a focusing means includes a light emitting element array 100 for irradiating a laser light according to an image signal input from the outside, and a respective laser beam irradiated from the light emitting element array 100. Parallel lenses 110 for guiding parallel to each other in parallel in one direction, focusing means 120 for guiding each laser light to pass through one virtual focal image, scanning means 130 for reflecting laser light, and the like. It consists of. And the laser light reflected by the scanning means 130 is projected on the screen 140 so that the user can easily recognize the image from the outside.

In addition, as shown in the present invention, the main controller 200 is provided for generating data and control signals for displaying an image on a screen according to the image data input from the computer 150 or the like.

The main controller 200 is a communication circuit 210 for receiving data such as an image or advertisement data from the computer 150, and the image or advertisement content received through the communication circuit 210 through a laser beam A main controller processor 220 for calculating color, brightness, and change over time of the laser diode to project onto the screen, a main memory 230 for storing the values calculated by the main controller processor 220, and Encoder 240 for detecting the position and rotation angle of the mirror motor 132 'or the rotary motor 134' to know the position of the rotary face mirror 134 or the galvano mirror 132, and the Based on the information on the position and rotation angle of the mirror motor 132 'or the rotation motor 134' detected by the encoder 240 and the data received from the main controller processor 220, a desired position on the screen 140 is obtained. To project the image Each laser constituting the light emitting device array 100 according to the motor driver 250 for controlling the rotation of the mirror motor 132 ′ or the rotating motor 134 ′ and the data transmitted from the main controller processor 220. It consists of a laser diode driver 260 or the like which serves to supply power to the laser diode elements 104 described below so that the diode elements 104 emit light sufficiently.

The configuration of the light emitting device array 100 is shown in detail in FIG.

As shown in the drawing, the light emitting device array 100 is a light source for generating light, and is made of a small laser diode wafer (LD wafer) or chip having a rod shape.

More specifically, the light emitting device array 100 is used by cutting a laser wafer (Laser wafer, 102) of a predetermined size as shown in FIG. That is, a plurality of laser diode elements 104 is used by cutting a row of laser diode elements 104 in a bar shape in the laser wafer 102 formed in a honeycomb form.

In the light emitting device array 100, color laser light is scanned. That is, conventional lasers (not shown) for generating and irradiating light of blue (B), green (G), and red (R) wavelengths are provided as in the related art. The laser beam having the same color as the image input through the light emitting device array 100 is scanned.

4A shows the configuration of the first embodiment of the ultra-small laser display apparatus having the focusing means according to the present invention.

As shown therein, the light emitting device array 100 is formed of a small laser diode wafer (LD wafer) as described above, and one side of the light emitting device array 100 (the right side in FIG. 4A). The parallel lens 110 is provided with each.

The parallel lens 110 is to guide each laser light irradiated from the plurality of laser diode elements 104 provided in the light emitting element array 100 to go straight in parallel to each other in one direction (the right in Figure 4a), The number corresponding to the plurality of laser diode elements 104 is provided.

The parallel lens 110 is also referred to as a collimated micro lens (Collimate micro lens), and is widely used in a device for scanning laser light, detailed description thereof will be omitted here.

A convex lens 122 is provided at one side (right side) of the parallel lens 110. The convex lens 122 guides each laser light traveling in one direction by the parallel lens 110 to pass through one virtual focal image, which is an example of the converging means 120.

More specifically, as shown in Fig. 2, all the light scanned from the laser diode elements 104 of the light emitting device array 100 which are arranged side by side in a vertical line converge to the virtual focal point f. Since the function of the convex lens 122 is generally known, a detailed description thereof will be omitted.

One side (right side) of the convex lens 122 is provided with a galvano mirror 132 that reflects the laser beam passing through the convex lens 122. The galvano mirror 132 constitutes an embodiment of the scanning means 130, and is made of a flat mirror of a predetermined size and is rotatably installed within a predetermined range.

A mirror motor 132 ′ is provided below the galvano mirror 132. The mirror motor 132 ′ causes the galvano mirror 132 to repeatedly flow within a predetermined range, and the power generated by the mirror motor 132 ′ is driven by the motor shaft 132 ″. Delivered to mirror 132.

Therefore, the laser light reflected by the galvano mirror 132 is to project an image of a predetermined size on the screen 140.

FIG. 4B shows the configuration of the second embodiment of the ultra-small laser display apparatus having the focusing means according to the present invention, which will be described below instead of the galvano mirror 132 used in the first embodiment shown in FIG. 4A. Rotating multifaceted mirror 134 is used.

That is, as in the first embodiment, the light emitting device array 100 emitting the color laser light is provided up and down, and on the right side of the light emitting device array 100, a plurality of parallel lenses for guiding the laser light. 110 are provided respectively. In addition, a convex lens 122 for changing the advancing direction of the laser light is provided at the right side of the parallel lens 110 so that a plurality of laser light converges to one virtual focal point f.

The laser beam passing through the convex lens 122 is reflected by the rotating polygon mirror 134 to project an image onto the screen 140. The rotating mirror 134 has a polygonal column shape having a predetermined size having a regular polygon in cross section, and a scan mirror is formed on an outer surface thereof to reflect the laser light. The rotating mirror 134 is also an embodiment of the scanning means 130 as the galvano mirror 132.

The rotating mirror 134 is installed to rotate in one direction. Accordingly, as shown in the lower side of the rotary mirror 134, a rotary motor 134 'is provided to generate rotational power, and the power generated by the rotary motor 134' is controlled by the rotation shaft 134 ". It is transmitted to the rotating mirror 134.

In more detail, the rotating mirror 134 is composed of several flat mirrors (for example, eight flat mirrors for an octagonal rotating mirror, and sixteen flat mirrors for a hexagonal rotating mirror) The laser light emitted to the surface of the rotating mirror mirror 134 is projected onto the screen 140 after being reflected from the surface of the rotating mirror mirror 134. Long projection to the side.

In this case, when the cross-section of the rotating mirror mirror 134 is octagonal, the laser beam is projected on the screen 140 at a horizontal length over 90 degrees from a light source (that is, the focus of the laser beam projected on the rotating mirror mirror 134). (Viewing angle 90 degrees), when the cross-section of the rotating mirror 134 is 16 degrees, the laser light is projected on the screen 140 at a transverse length over 45 degrees (viewing angle 45 degrees) from the light source.

The rotation polygon mirror 134 is determined by considering the size of the billboard, that is, the size of the billboard (ie, the screen), the characters to be drawn on the billboard, the image, and the like. Lateral angle) is determined by 720 / angle.

5A and 5B show the configuration of the third and fourth embodiments of the present invention, respectively, and are used as the focusing means 120 in the first and second embodiments shown in FIGS. 4A and 4B. The concave mirror 124 is used instead of the convex lens 122.

Therefore, in FIG. 5A, the laser light passing through the parallel lens 110 is reflected by the concave mirror 124 to pass through a virtual focal point f, and the laser light reflected by the concave mirror 124 is Reflected by the galvano mirror 132 again to form an image on the screen 140.

In addition, in FIG. 5B, similar to FIG. 5A, the laser light passing through the parallel lens 110 is reflected by the concave mirror 124 to pass through a virtual focal point f, and is reflected by the concave mirror 124. The laser light is reflected again by the rotating mirror 134 as described above to cause an image to appear on the screen 140.

6A and 6B schematically show the configuration of the fifth and sixth embodiments of the present invention, and a plurality of planar mirrors 128 are used in the fifth and sixth embodiments. That is, the mirror assembly 126 having a plurality of planar mirrors 128 is used as an example of the focusing means 120.

As shown, the mirror assembly 126 has a structure in which a plurality of planar mirrors 128 are inclined at a predetermined angle on one surface. That is, a very small flat mirror 128 corresponding to the size of the laser diode device 104 is installed to be inclined on one surface to reflect the laser light scanned by the laser diode device 104.

Preferably, the plurality of planar mirrors 128 are formed to have different inclination angles. That is, each laser light reflected by the planar mirror 128 is installed to be inclined in one direction so as to converge at one virtual focal point f, and the inclination angles thereof are different from each other.

That is, as shown in FIG. 6A or 6B, a galvano mirror 132 or a rotating mirror 134 that scans and reflects the laser light reflected from the mirror assembly 126 is provided at a lower side than the mirror assembly 126. In this case, each of the planar mirrors 128 is formed to have a smaller inclination angle toward the lower side.

More specifically, when the scanning means 130 is located below the mirror assembly 126 constituting the focusing means 120, as shown in FIG. The inclination angle 'α1' is formed to have a smaller size than the inclination angle 'α2' of the lower plane mirror 128 "formed on the lower side. The laser light reflected by the light beam converges to a virtual focal point f formed on one side of the focusing means 120.

Hereinafter, the operation of the micro laser display device having the focusing means having the above configuration will be described.

First, an image is input to the main controller 200 through a computer 150 or the like. That is, an image or advertisement material such as a computer 150 is transmitted to the main controller processor 220 through a communication circuit 210, and the main controller processor 220 transmits the received image or advertisement content through a laser beam. In order to project on the screen, the color, brightness and change over time of the laser diode device 104 are calculated.

The value calculated by the main controller processor 220 is stored in the main memory 230 and transferred to the laser diode driver 260. The laser diode driver 260 supplies power to the laser diode devices 104 such that the respective laser diode devices 104 constituting the light emitting device array 100 emit light sufficiently according to the received data.

When power is applied to the laser diode device 104, the laser diode device 104 scans laser light. That is, light of blue (B), green (G), and red (R) wavelengths generated from each laser (not shown) is integrated to scan laser light of a color corresponding to an input signal.

The laser light scanned by the laser diode element 104 travels in a straight line by the parallel lens 110, and the laser light traveling through the parallel lens 110 in parallel runs through the focusing means. The direction of travel is changed by 120. That is, the direction of travel is changed by the mirror assembly 126 made up of the convex lens 122, the concave mirror 124, or the plurality of planar mirrors 128 as described above. Converge to focus f.

The laser light converged to the virtual focal point f is reflected by the scanning means 130 to implement an image on the screen 140. That is, the laser light is reflected by the galvano mirror 132 or the rotating mirror 134 as described above to form an image on the screen 140.

The galvanometer mirror 132 or the rotating mirror 134 is operated by the mirror motor 132 'or the rotating motor 134' provided at the lower side thereof, and the mirror motor 132 'or the rotating motor ( 134 ′ is controlled by the motor driver 250.

That is, the encoder 240 senses the position and rotation angle of the mirror motor 132 ′ or the rotating motor 134 ′ and transmits the same to the main controller processor 220. The rotation of the mirror motor 132 ′ or the rotating motor 134 ′ is controlled to project an image to a desired position on the screen 140 based on the data transmitted from the controller processor 220.

On the other hand, since the scanning means 130 such as the galvano mirror 132 or the rotating mirror 134 is in a rotating state, the reflected laser light is projected on the screen 140 laterally. The lateral length of the laser light projected onto the screen 140 becomes longer as the screen 140 moves away from the scanning means 130. In addition, since the light emitting device array 100 is formed long in the vertical direction, the longer the vertical length of the image projected on the screen 140 is, the farther the screen 140 is from the scanning means 130.

As described above, the lateral length and the longitudinal length of the laser light projected on the screen 140 become longer as the screen 140 moves away from the scanning means 130, so that the screen 140 appears on the screen even if the position of the screen is changed somewhat from the display device. Text, images, etc. have a constant aspect ratio.

This is because each laser light whose direction of travel is changed by the focusing means 120 has different projection angles so as to form one focal point in the virtual space, and the scanning means 130 rotates. Therefore, even if the position of the screen 140 approaches or moves away from the scanning means 130, the laser light projected to the longitudinal side of the screen 140 also has a constant angle, such as the laser light projected to the transverse side of the screen 140. Since it is projected onto the screen 140, the aspect ratios of characters, images, etc. appearing on the screen 140 as a result remain constant even if the position of the screen 140 changes.

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, as shown in FIG. 7A (Seventh Embodiment) and FIG. 7B (Eighth Embodiment), the scanning means 130 such as the galvano mirror 132 or the rotating face mirror 134 and the It may be possible to further install a separate f-theta lens 300 between the screen 140. The f-theta lens (f-θ Lens) 300 allows the laser light reflected by the scanning means 130 to be scanned at a constant speed from side to side on the flat screen 140.

In more detail, since the screen 140 has a flat surface, each laser light scanned from the laser diode device 104 and reflected by the scanning means 130 has a constant angular velocity, but the screen 140 The speed of the laser beam scanned from side to side is increased at the left and right side ends in the center. Therefore, the left and right side ends of the image are enlarged to the left and right, and the brightness of the image is reduced.

The f-theta lens (f-θ Lens) 300 is to prevent such a problem, such that the left and right movement speed of the laser beam scanned at the left and right side ends of the screen 140 and the speed of moving the center portion to the left and right are constant. Will be corrected. Since the f-theta lens 300 is a lens that is used in recent years, a detailed description thereof will be omitted.

According to the ultra-small laser display device having the focusing means according to the present invention, the light emitting element array is made of a micro laser wafer (LD wafer) or chip having a rod shape. Therefore, it is possible to manufacture a very small laser display device. As a result, there is an advantage in that a compact laser display device having the focusing means according to the present invention can be incorporated into a small device such as a mobile phone or a watch.

In addition, the present invention allows each laser beam scanned from a plurality of laser diode elements formed in a long line to converge to one virtual focus by the focusing means, while reflecting the laser beam by the scanning means to form an image on the screen Configured. Therefore, there is an advantage that the aspect ratio of the image projected on the screen is kept constant regardless of the distance between the screen and the apparatus according to the present invention.

In addition, in one embodiment of the present invention, an f-theta lens may be provided between the scanning means and the screen. Therefore, since the left and right moving speeds of the laser beams scanned at the left and right side ends and the center of the screen are constant, the quality of the image implemented on the screen is improved. That is, a phenomenon in which the left or right of the image implemented on the left and right side ends of the screen is long or the brightness is lowered is prevented.

Claims (8)

A light emitting element array including a plurality of laser diode elements generating laser light in a row and irradiating laser light according to an input image signal; A parallel lens provided at one side of the light emitting element array and configured to guide the respective laser beams irradiated from the plurality of laser diode elements in parallel to each other in one direction; A focusing means provided at one side of the parallel lens and guiding each laser light traveling in one direction by the parallel lens to pass through one virtual focal image; A scanning means for reflecting the laser light passing through the focusing means; The focusing means, And a convex lens or a concave mirror for converging the laser light traveling straight by the parallel lens to one virtual focal point. According to claim 1, wherein the plurality of laser diode elements provided in the light emitting element array has a focusing means characterized in that for scanning the laser light incorporating blue (B), green (G), red (R) color Micro laser display device. The ultra-small laser display apparatus according to claim 2, wherein the light emitting device array is made of an ultra-small laser wafer (LD wafer) or a chip having a rod shape. A light emitting element array including a plurality of laser diode elements generating laser light in a row and irradiating laser light according to an input image signal; A parallel lens provided at one side of the light emitting element array and configured to guide the respective laser beams irradiated from the plurality of laser diode elements in parallel to each other in one direction; A focusing means provided at one side of the parallel lens and guiding each laser light traveling in one direction by the parallel lens to pass through one virtual focal image; A scanning means for reflecting the laser light passing through the focusing means; The focusing means, And a mirror assembly in which a plurality of planar mirrors corresponding to each laser beam going straight by the parallel lens are inclined on one surface thereof. The method of claim 4, wherein the plurality of planar mirrors, It is installed to have a different inclination angle, so that each of the laser light is focused to a virtual focal point microminiature laser display device. The method of claim 3 or 5, wherein the scanning means, The micro laser display device having a focusing means, characterized in that the rotating multi-face mirror or galvano mirror reflecting the laser light scanned by the light emitting element array. The focusing means according to claim 6, further comprising an f-theta lens on one side of the scanning means to make the left and right moving speeds of the laser light scanned on the flat screen reflected by the scanning means constant. Micro laser display device having a. The method of claim 7, wherein the rotating mirror The micro laser display device having a focusing means having a rotating polygonal column shape, the outer surface of the scanning mirror is formed to reflect the laser light.

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