KR20010000463A - Device of Laser Display - Google Patents

Abstract

PURPOSE: A laser display device is provided to simplify a structure, to reduce a production cost and to improve the definition of a displayed image on a screen. CONSTITUTION: A light source generates a laser beam according to a character or an image signal. A converging device has plural reflecting faces to converge the laser beam. A horizontal reflector(121) contains a reflecting unit(121a) and a position sensor(125) and changes a horizontal reflecting angle of the laser beam by rotating the reflecting unit. A vertical reflector contains a reflecting unit(141a) and a position sensor(145) and changes a vertical reflecting angle of the laser beam by rotating the reflecting unit. A controller controls the horizontal/vertical reflectors by referring to the image signal and positional information. An image is displayed on a screen by reflecting each laser beam from red/green/blue lasers with the horizontal/vertical reflectors and projecting on the screen.

Description

Laser display device {Device of Laser Display}

The present invention relates to a laser display device, and more particularly, a laser display device for displaying an image by scanning a laser beam generated from a red, green, or red laser by rotating a horizontal reflector and a vertical reflector in a prism shape on a screen. It is about.

In the video display, as the size of the screen becomes larger as the consumer desire increases, the existing CRT (Cathode Ray Tube) or liquid crystal display (LCD) becomes more difficult to manufacture the screen and the resolution is lowered. There was a limit to the size of the screen that can be put to practical use.

In order to overcome this limitation, a large screen is realized by enlarging an image obtained from a cathode ray tube or a liquid crystal display with a lens and projecting it on a screen. In particular, in recent years, a laser display device using a laser having a good light attenuation characteristic according to a distance as a light source has been developed in order to reduce deterioration of image quality projected on a screen as an image is enlarged by a lens.

An example of such a conventional laser display device is shown in FIG. 1.

As shown, the light source consists of a white light laser that generates white light, and the main wavelengths of the white light laser beam emitted from the light source are 488 nm, 514 nm and 647 nm, respectively. On the light path of the light source, a high reflection mirror 21 for changing the main path of the laser beam generated by the light source 10, a collimating lens 22 for turning the laser beam into parallel light, and a size of the parallel beam is reduced. The optical system 20 which consists of the telescope lens system 23 and 24 is arrange | positioned. The telescope lens systems 23 and 24 have a long focal length at the front end and a short focal length at the rear end. The laser beam having a constant divergence angle becomes a parallel beam while passing through the collimating lens 22 of the optical system 20, and the magnification ratio of two lenses constituting the telescope lens while passing through the telescope lens systems 23 and 24. It has a reduced beam size.

The optical separation unit 30 separates the laser beam of white light incident from the telescopic lens system 23 and 24 of the optical system into red, green, and blue monochromatic light. The optical splitter 30 includes two dichroic mirrors 31 and 32 and one high reflection mirror 33. The microwing mirror 31 reflects blue light by 99% or more, and transmits light of the remaining wavelengths by 95% or more. Similarly, the dichroic mirror 32 reflects 99% of green light and transmits 95% or more of red light. The high reflection mirror 33 reflects the transmitted red light and enters the light modulator 40.

The thickness of the beam incident through the optical splitter 30 to the optical modulator 40 should be 200 ?? Lm, which means that the focusing lenses 35, 36, and 37 are in front of the optical modulators 40 by a predetermined distance, respectively. It is possible by installing in. The distance between the focusing lenses 35, 36, 37 and the optical modulators 40 is determined according to the beam size incident on the focusing lenses 35, 36, 37. The smaller the beam size, the smaller the distance between the focusing lenses 35, 36, 37 and the optical modulator 40 for obtaining the beam waist diameter of 200 Lm in the optical modulators 40. However, if the beam size is reduced too small, the light output per unit area is increased and the lenses or mirrors are damaged, so an appropriate beam diameter must be determined.

The light modulator is configured to provide a beam of white light provided from the light source 40 according to a color signal separated by a color separation decoder (not shown) from the image signal provided by the image signal generator to the optical system 20 and the optical separator 30. Three optical modulators (40) for modulating the beams of red, green, and blue monochromatic light separated by the optical signal of monochromatic light are provided.

The light combiner 50 collects the beams of monochromatic light modulated by the optical signal from the optical modulator 40 into one to form an image signal having a beam shape of various colors. The photosynthesis unit 50 has dichroic mirrors 51 and 52 installed for synthesizing the beams of monochromatic light into the image signal in the form of beams for projecting onto the screen 60 and the high reflection for changing the path of the separated monochromatic light. It is composed of a mirror 53.

Here, the vertical scanning portion 61 is a galvanometer, and the horizontal scanning portion 62 is a polygonal mirror. Relay lens systems 63 and 64 are provided between the galvanometer of the vertical scanning unit 61 and the polygonal mirror of the horizontal scanning unit 62.

Referring to the operation state of the conventional laser display device configured as described above are as follows.

The white light emitted from the light source 10 is reflected by the high reflection mirror 21 and becomes a laser beam in the form of parallel light in the collimating lens 22. The laser beam passes through the telescoping lens system 23 and 24, and then passes through the dichroic mirrors 31 and 32, and is separated into blue, green, and red light and incident to the optical modulator 40. That is, blue light is reflected by the dichroic mirror 31 by 99% or more and is incident to the optical modulator 40, and light of the remaining wavelength is transmitted by 95% or more. Similarly, green light is reflected by the dichroic mirror 32 by 99% or more and enters the light modulator 40, and red light is transmitted by 95% or more. The transmitted red light is reflected by the high reflection mirror 33 and is incident on the light modulator 40.

In addition, the video signals provided from the video signal generator (not shown) are separated into color signals of blue, green, and red light by a color signal separation decoder (not shown). The monochromatic light of blue, green, and red light modulated by the optical modulator 40 is combined into a single beam by the dichroic mirrors 51 and 52 and the high reflection mirror 53. Green light is reflected by the dichroic mirror 51, red light is transmitted, blue light is transmitted by the dichroic mirror 52, and red and green light is reflected.

The light synthesized by the photosynthesis unit 50 is vertically scanned by the vertical scanning unit 61 and horizontally scanned by the horizontal scanning unit 62 to display an image on the screen.

However, the conventional laser display device having the above configuration has the following problems.

That is, in order to separate the white light generated from the white light laser as a light source into red, green, and blue, the optical separation unit 30, that is, two dichroic mirrors 31 and 32 and one high reflection mirror 33 are provided. Since the optical modulator 40 for modulating each of the beams thus separated using an image signal should be provided, and the photosynthesis unit 50 for synthesizing each beam modulated in the optical modulator 40 should be provided. In addition, the structure of the product is not only very complicated, there is a problem that the manufacturing cost of the product increases accordingly.

As described above, light is separated from the white light separation unit 30 by red, green, and blue in one white light and then modulated into a single beam using the photosynthesis unit 50. In the process of separating and synthesizing, the efficiency of the beam for displaying an image is lowered, thereby degrading the image quality of the image displayed on the screen.

Accordingly, the present invention has been made to solve the above problems, the red, green, blue and yellow laser beam generated by the light source and reflected and scanned by the reflecting member is formed in a triangular prism and rotated By reflecting to the horizontal and vertical reflectors and scanning the screen to display an image, the structure of the product can be simplified, thereby reducing the manufacturing cost of the product and improving the image quality of the image displayed on the screen. It is an object of the present invention to provide a laser display device.

1 is a configuration diagram showing a conventional laser display device,

2 is a configuration diagram showing a laser display device according to the present invention;

3A and 3C are schematic views showing a light source unit of the laser display device according to the present invention;

4A and 4B are perspective views showing a reflected state of the laser beam according to the present invention;

5a and 5b is a view showing a horizontal and vertical reflector according to the present invention,

6 is a view showing the operating state of the horizontal and vertical reflector according to the present invention,

7 is a block diagram showing a laser display device according to the present invention.

Explanation of symbols on the main parts of the drawings

100; Light sources 101,102,103,104; Red, Green, Blue, Yellow Laser

105; First member 110; housing

111; Laser housing 112; spring

113; Adjusting member 121; Horizontal reflector

121a, 141a; Reflectors 122,142; motor

125,145; Position sensor 140; Vertical reflector

150; screen

Laser display device according to the present invention for achieving the above object, the light source for generating a laser beam according to the character or image signal to be displayed; Converging means having a plurality of reflective surfaces for converging the laser beam emitted from the light source portion; Rotating by the rotation drive means, and includes a reflector for reflecting the incident laser beam and a position sensor for detecting the position of the reflector, the horizontal direction of the incident laser beam by the change of the position of the reflector according to the rotation of the reflector Horizontal reflection means of the laser beam for changing the reflection angle; When rotated by the rotation drive means, and includes a reflector for reflecting the incident laser beam and a position sensor for detecting the position of the reflector, the vertical direction of the incident laser beam by the change of the position of the reflector according to the rotation of the reflector Vertical reflection means of the laser beam for changing the reflection angle; And control means for controlling the light source unit, the horizontal reflecting means, and the vertical reflecting means by referring to the image signal to be displayed and the respective position information from the position sensor included in the horizontal reflecting means and the vertical reflecting means. It is characterized by including.

The light source generates a blue, red, and green laser beam, and is preferably a blue, red, green laser installed at a predetermined angle in the housing.

The blue, red, and green lasers are hinged at both sides of the front end of the laser housing, and the bottom of the rear end is elastically supported by the elastic member, and the front end of the rear end is adjusted by adjusting the height of the rear end at the upper end of the rear end. The adjusting member for rotating is fixed rotatably.

The light source further includes a yellow laser for generating a yellow laser beam.

Preferably, the converging means has a plurality of reflective surfaces for reflecting a plurality of ray beams among the red, green, blue, and yellow laser beams, and at least one laser beam of each of the laser beams is transmitted.

Preferably, the horizontal reflecting means is a horizontal reflector having a plurality of reflecting portions, and the vertical reflecting means is a vertical reflector having a plurality of reflecting portions.

Hereinafter, with reference to the accompanying drawings will be described in more detail the configuration and operation of the laser display device according to an embodiment of the present invention.

2 is a block diagram showing a laser display device according to the invention, Figures 3a to 3c is a block diagram showing a light source of the laser display device according to the invention. 4A to 4B are views illustrating a reflecting member of the light source unit shown in FIG. 3, and FIGS. 5A and 5B are views showing horizontal reflectors of the laser display apparatus according to the present invention. 6 is a view showing the operating state of the vertical and horizontal reflector according to the present invention, Figure 7 is a block diagram showing a laser display device according to the present invention.

As shown, the laser display device according to the present invention includes a light source 100 for generating a laser beam according to a character or an image signal to be displayed, and a plurality of vanes for reflecting and converging the laser beam. A converging means 105 having a slope 105a, a horizontal reflecting means of the laser beam which is rotated by the rotation driving means, has a reflecting portion and a position sensor, and changes the horizontal reflecting angle of the incident laser beam; Control means for controlling the rotational drive means, the horizontal and vertical reflecting means, and the light source, the vertical reflecting means of the laser beam rotated by the driving means and having the reflecting portion and the position sensor to change the vertical reflecting angle of the incident laser beam. It includes a means.

The light source 100 generates red, green, and blue laser beams, and includes red, green, and blue lasers 101, 102, and 103 installed at a predetermined angle in the housing, and the red, green, and blue lasers, 101, 102, and 103, respectively. And a yellow laser 104 positioned at the center of the laser beam to generate a yellow laser beam.

In addition, the red, green, and blue lasers 101, 102 and 103 are installed in the housing 110 at intervals of a predetermined angle, that is, at intervals of 120 °, as shown in FIGS. 2A to 2B. In the center of the green, blue and blue lasers 101, 102 and 103, a first member 105, which is a converging means, is installed perpendicularly to the surface of the housing 110. The first member 105 is provided with a plurality of reflecting surfaces 105a for reflecting each laser beam generated by each of the lasers 101, 102, and 103. The yellow laser 104 is installed at the rear of the first member 105 to generate and scan a yellow laser beam from the rear of the first member 105 to the front.

Here, the yellow laser 104 has the smallest wavelength range of the color that has been pointed out as a disadvantage of the conventional imaging devices, so that when the human compares the image with the real, the yellow portion 104 becomes red, green, and blue. As it is not enough to mark, it is to supplement this yellow part.

On the other hand, the red, green, blue, and yellow lasers (101, 102, 103, 104), which are light sources, are preferably semiconductor lasers, but have a more powerful light source using a high voltage voltage and pulse of the laser, and use a bright laser, regardless of indoor or outdoor location. You can also use a gas or solid-state laser that can output.

The plurality of reflective surfaces 105a of the first member 105 are coated to complete the red, green, and blue laser beams. In addition, the first member 105 may be formed of a transparent material so as to transmit the yellow laser beam. That is, the first member 105 is formed in a triangular pyramid shape so that the red, green, and blue laser beams are reflected on the reflecting surface 105a, as shown in FIGS. 4A and 4B, and emitted in front thereof, and the yellow The laser beam is preferably formed of a transparent material so as to pass through.

In addition, the red, green, and blue lasers 101, 102, and 103 are installed in the laser housing 111 fixed to the housing 110 such that the front end thereof is rotated. That is, each of the laser (101, 102, 103) is a structure in which both sides of the front end is hinged to the inner side of the laser housing 111 is rotated around the hinge, the spring is elastically supported on the bottom of the laser housing 111 on the bottom end 112 is interposed, the upper end of the rear end portion is pressed by the adjusting member 113 that is screwed through the upper surface of the laser housing 111.

That is, the red, green, and blue lasers 101, 102 and 103 adjust the height of the adjusting member 113, as shown in Fig. 3c, to determine the front end of each laser 101, 102, 103. The front end portion is pivoted so that each laser beam reflected by the reflective surface 105a of the first member 105 forward by rotating at an angle is formed as one focal point. In addition, the focal point formed by each laser beam according to the size of the screen 150 on which each laser beam is scanned to display an image is determined according to the size of the screen 150 on which the image is displayed by each laser beam. Is determined.

Then, the horizontal reflector is rotated by the rotation driving means, the horizontal reflector 121 including a reflector 121a for reflecting the incident laser beam and a position sensor 125 for detecting the position of the reflector 121a. to be. The horizontal reflecting means is for changing the horizontal reflection angle of the incident laser beam by the position change of the reflector according to the rotation of the reflector 121a. The receiver reflector 121 has a triangular prism shape, and the reflector 121a is formed by coating only a part of the entire surface of the horizontal reflector 121.

In addition, the vertical reflector, the vertical reflector 141 is rotated by the rotation driving means, and includes a reflector 141a for reflecting the incident laser beam and a position sensor 145 for detecting the position of the reflector 141a. )to be. The vertical reflecting means is for changing the vertical reflection angle of the incident laser beam by the position change of the reflector according to the rotation of the reflector 141a. That is, the vertical reflector 141 is rotated in the vertical direction with respect to the rotation direction of the horizontal reflector 121 and has a triangular prism shape of a predetermined length, and the reflector 141a is the entire surface of the vertical reflector 141. Only part of the coating is formed. That is, the horizontal and vertical reflectors 121 and 141 are composed of three quadrangular surfaces and two triangular surfaces, and the three reflective surfaces 121a and 141a are formed to reflect the laser beam. The two surfaces serve as the rotation centers rotated by the rotation driving means. In addition, it is preferable that the edges of the three surfaces of the horizontal and vertical reflectors 121 and 141 formed in a quadrangular shape are anti-reflective coating in black to prevent diffuse reflection at the corners.

More specifically, the horizontal and vertical reflectors 121 and 141 are rotated by the rotation driving means, and the rotation driving means are the motors 122 and 142, and the motor is preferably a stamping motor.

Position sensors 125 and 145 are provided at positions corresponding to the reflectors 121a and 141a in one of two surfaces triangular in the horizontal and vertical reflectors 121 and 141, and the position sensors 125 and 145 are horizontal and vertical. When the reflectors 121 and 141 rotate, the position change of the reflector according to the rotation of the reflectors 121a and 141a is transmitted to the control means.

On the other hand, a typical TV of an imaging device sends about 30 pictures per second with 525 horizontal scan lines to display moving images on the screen. Therefore, since the reflector 121a for reflecting the laser beam is made of three planes, the horizontal reflector 121 according to the present invention displays one image only after rotating about 175 times, and thus displays 30 images per second. It should be about 5250 turns to show. Therefore, the motor 122 for rotating the horizontal reflector 121 is preferably about 5250rpm or more.

The control means receives the information of the signal separated and delayed into horizontal and vertical signals and the position information of the horizontal and vertical reflectors 121 and 141 by the sensors 125 and 145 by the reflector controller 220. It is preferable that the microcomputer 230 controls 101,102,103,104, motors 122,142, and horizontal and vertical reflectors 121,1410.

The operation of the laser display device according to the present invention having the configuration as described above will be briefly described.

When a text or video signal is input, the horizontal and vertical signal separators 200 separate the horizontal and vertical signals. The separated horizontal and vertical signals are delayed by the signal delay unit 210, and the delayed horizontal and vertical image signals are input to the reflector controller 220. That is, the signal delay unit 210 starts reflection at point a as shown in FIG. 7 in the reflection units 121a and 141a formed in the horizontal and vertical reflectors 121 and 141 having a triangular prism shape, and then reflects at point f. After the end, a gap is generated up to the point where the reflection is started by the reflectors 121a and 141a on the other side, which delays the image signal, that is, the horizontal and vertical signals.

The position sensors 125 and 145 provided in the horizontal and vertical portions 121 and 141 transmit the position information of the coated reflectors 121a and 141a to the reflector controller 220. Then, the reflector controller 220 transmits the horizontal and vertical image signals transmitted from the signal delayer 210 and the position information of the horizontal reflector 121 and the vertical reflector 141 to the microcomputer 230. The microcomputer 230 transmits the position information of the horizontal reflector 121 and the vertical reflector 141 to the laser controller 240, and the laser controller 240 transmits the position information of the horizontal reflector 121 and the vertical reflector 141. And control the laser beam generation of the light source 100 by the delayed horizontal and vertical image signals and the motors 125 and 145 driving the horizontal reflector 121 and the vertical reflector 141.

As described above, when the laser beam of the light source 100 is generated by being controlled by the laser controller 240, each laser beam is reflected by the reflecting member 105 and scanned into the rotating horizontal reflector 121.

Then, the horizontal reflector 121 is rotated by the motor 125 controlled by the microcomputer 230 received the position information, while rotating the laser beam of the light source 100 controlled by the microcomputer 230, The ray point beam is reflected to the vertical reflector 141 at a predetermined angle with respect to the reflecting portions of each surface and scanned.

Then, the vertical reflector 141 is rotated by a motor controlled by the microcomputer 230 similarly to the horizontal reflector 121, and rotates the laser beam of the light source 100 controlled by the microcomputer 230. The ray point beam is reflected at a predetermined angle with respect to the reflecting portion of the laser beam, and is scanned on the screen.

As such, the laser beam is horizontally reflected by the horizontal reflector 121 and scanned, and is vertically reflected by the vertical reflector 141 to be scanned on the screen 150 to display an image.

As described above, according to the present invention, each laser beam emitted from the red, green, and blue lasers is formed in a triangular prism shape, reflected by a rotating horizontal reflector and a vertical reflector, and scanned on the screen to scan an image of the screen. Because of the display, it is possible to prevent the laser beam emitted from the laser from being lost, thereby improving the image quality of the image displayed on the screen.

In addition, since a separate configuration such as a conventional optical separator and a photosynthesis unit is not required, the product can be simply configured, thereby lowering the unit cost of the product.

Claims (8)

A light source generating a laser beam according to a character or an image signal to be displayed; Converging means having a plurality of reflective surfaces for converging the laser beam emitted from the light source portion; Rotating by the rotation drive means, and includes a reflector for reflecting the incident laser beam and a position sensor for detecting the position of the reflector, the horizontal direction of the incident laser beam by the change of the position of the reflector according to the rotation of the reflector Horizontal reflection means of the laser beam for changing the reflection angle; When rotated by the rotation drive means, and includes a reflector for reflecting the incident laser beam and a position sensor for detecting the position of the reflector, the vertical direction of the incident laser beam by the change of the position of the reflector according to the rotation of the reflector Vertical reflection means of the laser beam for changing the reflection angle; And And control means for controlling the light source, the horizontal reflecting means, and the vertical reflecting means with reference to the image signal to be displayed and the respective position information from the position sensor included in the horizontal reflecting means and the vertical reflecting means. Laser display device characterized in that. The laser display apparatus of claim 1, wherein the light source is a blue, red, green laser that generates blue, red, and green laser beams and is installed at a predetermined angle in the housing. According to claim 2, wherein the blue, red, green laser is hinged on both sides of the front end portion of the laser housing, the bottom of the rear end is elastically supported by the elastic member, the upper end of the rear end by adjusting the height of the rear end And a control member rotatably fixed to rotate the front end portion around the hinge. The method according to claim 1 or 2, The light source further comprises a yellow laser for generating a yellow laser beam. The method of claim 1, wherein the converging means has a plurality of reflecting surfaces for reflecting a plurality of ray beams of the red, green, blue, yellow laser beam, so that at least one of the laser beam is transmitted. Laser display device characterized in that. The method of claim 1, And said horizontal reflecting means is a horizontal reflector having a plurality of reflecting portions. The method of claim 6, And the plurality of reflectors are formed by completely reflecting coating on one side of each surface of the horizontal reflector. The method of claim 1, And said vertical reflecting means is a vertical reflector having a plurality of reflecting portions.