KR20040078248A - Laser Display - Google Patents

Abstract

PURPOSE: A laser display apparatus is provided to improve the optical efficiency by synthesizing effectively laser beams and transmitting the synthesized laser beams. CONSTITUTION: A red, a blue, and a green laser(411,412,413) are used for outputting a red, a blue, and a green laser beam. An optical fiber(42) is used for synthesizing the laser beams and transmitting an optical signal. A color separator(43) is used for separating colors from the optical signal while being rotated. An illumination optical system(44) is used for focusing the separated laser beams of the color separator(43). A display panel(45) is used for controlling an output of the illumination optical system according an electric signal and displaying an image. A projection system(46) is used for magnifying and projecting the image. An image signal controller(48) is used for receiving an image signal and driving the display panel. A screen(47) is used for displaying the magnified image.

Description

Laser display device {Laser Display}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser display device, and in particular, fuses optical fibers that transmit each light, synthesizes R, G, and B light into white light, and then transfers the color to the display device to facilitate color placement and efficiency. It relates to a laser display device characterized in that the improved.

Conventionally, a lamp is used as a light source of a projection display device, but a laser display device using a laser as a light source instead of a lamp has been developed.

The use of a laser as a light source has the advantage that the color of an image is clear, close to pure color, and has a wide range of color reproduction, and a high contrast ratio can be obtained to obtain a clear image.

Hereinafter, a conventional laser display device will be described with reference to the accompanying drawings.

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

As shown in FIG. 1, the conventional laser display device uses the laser 11 as a light source and focuses the laser light on the AOM (Acousto-Optic Modulator) 13 by the optical system 12.

The AOM 13 adjusts the amount of light transmitted by an electrical signal associated with the image signal, and the laser light controlled by the AOM 13 proceeds to a polygon mirror 14.

The polygon mirror 14 rotates to implement a horizontal image of the screen.

The light reflected from the polygon mirror 14 proceeds to a galvanometer 15.

The galvanometer 15 implements a vertical image of the screen while repeating a predetermined angle up and down. The rotation and angle combination of the polygon mirror 14 and the galvanometer 15 scan the laser light on the screen 16 to display the screen.

2 is a configuration diagram showing a projection display device using a conventional laser as a light source.

As shown in FIG. 2, the conventional projection display device using a laser as a light source uses the laser 21 as a light source instead of a lamp and irradiates the display panel 23 with the laser light by the illumination optical system 22.

The display panel 23 displays an image by adjusting the amount of light by an electrical signal, and displays the image on the screen 25 by the projection optical system 24 to display the image on a large screen.

Meanwhile, red laser, green laser, and blue laser are used as laser light sources to implement color images.

In order to transmit the laser light of each color to the display panel, the light must be synthesized.

Hereinafter, a method of synthesizing and transmitting light in the above-described conventional laser display device will be described.

Figure 3a is a schematic diagram showing a method of transmitting the conventional laser light by the filter, Figure 3b is a schematic diagram showing a method of transmitting the conventional laser light by the optical fiber.

First, the method of transmitting the laser light by the filter is as follows.

As shown in FIG. 3A, the red laser 311 and the green laser 312 are synthesized by the first filter 321.

The synthesized light is combined with the blue laser 313 by the second filter 322 and proceeds to the display panel 33.

That is, the light is synthesized and transmitted by the filters 321 and 322 that transmit or reflect specific wavelengths.

As such, the method of synthesizing light by the filter has a spatial constraint in arranging the light source because the filter should be disposed in the 45 ° direction with respect to the laser light source of each color, and the light should be synthesized after being incident perpendicularly to each other. However, there is a problem that the system constituting the laser display device becomes larger.

In addition, when the laser and the filter must be aligned, and the filter is disposed at an angle greater than or less than 45 ° with respect to the laser light source, there is a problem in that the transmittance is different for each light to have non-uniform light distribution.

On the other hand, when the laser light is transmitted through the filter, as shown in FIG. 3B, the display panel through the optical fiber 34 through which light of each color emitted from the red, green, and blue lasers 311, 312, and 313 are transmitted, respectively. Forwarded to (33).

Such a configuration can reduce the size of the system with less constraints on the placement of the laser.

By the way, the optical fibers 34 connected to the lasers 311, 312, and 313 of each color have a problem in that they must be gathered together at the emission unit and the emission surface must be exactly matched to one plane.

The conventional laser display device as described above has the following problems.

In other words, the laser light emitted for each color of red, blue, and green should be fused and output to the display panel. However, when the light is fused through the filter, the angle between the laser light source and the filter cannot be easily adjusted. When fusing through an optical fiber, there is a problem in that it is difficult to exactly match the exit plane to one plane.

The present invention has been made in order to solve the above problems by fusing the optical fibers for delivering each light to combine the R, G, B light into white light, and then transfer the color separation to the display device to facilitate the placement of the optical fiber. It is an object of the present invention to provide a laser display device which is characterized in that the efficiency is improved.

1 is a configuration diagram showing a conventional laser display device

2 is a configuration diagram showing a projection display device using a conventional laser as a light source;

3A is a schematic diagram illustrating a method of delivering conventional laser light by a filter;

Figure 3b is a schematic diagram showing a method of transmitting the conventional laser light by the optical fiber

4 is a configuration diagram illustrating a laser display device according to a first exemplary embodiment of the present invention.

5 is a detailed block diagram showing the optical fiber of FIG.

6 is a block diagram showing in detail the color separation apparatus and signal transmission thereof of FIG.

FIG. 7 is a timing diagram illustrating a change in an input / output signal of the color separation apparatus of FIG. 6.

8 is a configuration diagram illustrating a laser display device according to a second exemplary embodiment of the present invention.

9 is a timing diagram illustrating a change in an input / output signal of the color separation apparatus of FIG. 8.

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

42: optical fiber 43: rotating color separation device

44: illumination optical system 45: display panel

46: projection optical system 47: screen

48: video signal controller 411, 412, 413: red, green, blue laser

511, 512, 513: red, green, blue laser light

52: optical fiber incidence portion 53: optical fiber core

54 Fiber Optic Cladding 55 Fiber Optic Fusion Part

56: optical fiber exit unit 64: sensor

711, 712, 713: red, green, blue laser

72: optical fiber 73: illumination optical system

74: display panel 75: projection optical system

76: screen 77: video signal controller

The laser display device of the present invention for achieving the above object is a red, blue, green laser that outputs red, blue, green laser light, an optical fiber that combines the respective laser light to transmit an optical signal, and the light A rotating color separation device for color separating signals, an illumination optical system for focusing the color separated laser light, a display panel for displaying an image by adjusting an amount of light incident through the illumination optical system by an electric signal, and the image The projector includes a projection optical system for magnifying and projecting, an image signal controller for receiving an image signal input from an external device, and driving a display panel, and a screen for projecting an image enlarged through the projection optical system.

In the optical fiber, each laser light is preferably synthesized as white light and transmitted.

The optical fiber is branched to the incident portion receives light from each laser, in the middle of the light is fused between the cores of the optical fiber to form a single optical fiber, it is preferable to output the light synthesized in the exit portion.

The light incident on the optical fiber is totally reflected by the difference in refractive index between the core and the cladding, so that the light travels along the optical fiber core.

The image signal controller may receive an image signal from the outside and match the colors of the display panel and the rotating color separator.

The rotating color separation apparatus may output the color signals by sequentially separating the optical signals while rotating.

The rotating color separation apparatus may further include a sensor for detecting whether the output color separation signal is synchronized with the image signal applied from the image signal controller to the display panel.

In addition, the laser display device of the present invention for achieving the same object is a red, blue, green laser that outputs red, blue, green laser light, an optical fiber that combines the respective laser light to transmit an optical signal, and the synthesis An illumination optical system for focusing the laser light, a display panel for displaying an image by adjusting an amount of light incident through the illumination optical system by an electrical signal, a projection optical system for expanding and projecting the image, and an image signal input from the outside. In another aspect, the present invention includes an image signal controller configured to receive an input and drive a display panel, and a screen to project an enlarged image through the projection optical system.

Preferably, the image signal controller receives the red, green, and blue laser lights and sequentially turns them on and off to adjust the light irradiated to the display panel.

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

4 is a configuration diagram illustrating a laser display device according to a first exemplary embodiment of the present invention.

As shown in FIG. 4, the laser display device according to the first exemplary embodiment of the present invention synthesizes red, blue, and green lasers 411, 412, and 413 that output red, blue, and green laser lights, and synthesizes the laser lights. An optical fiber 42 for transmitting an optical signal, a rotating color separation device 43 for color separation of the optical signal, an illumination optical system 44 for focusing the color separated laser light, and the illumination optical system 44 The display panel 45 for displaying an image by adjusting the amount of light incident through the electric signal, the projection optical system 46 for magnifying and projecting the image, and the image signal for driving the display panel by receiving an image signal input from the outside. And a control unit 48 and a screen 47 for projecting the enlarged image through the projection optical system.

The operating principle of the laser display device according to the first embodiment of the present invention is as follows.

The red, green, and blue lasers 411, 412, and 413 generate and proceed with laser light of the corresponding colors, respectively.

Each laser light is focused on an incident portion (see 52 in FIG. 5) of the optical fiber 42 and proceeds.

FIG. 5 is a detailed diagram illustrating the optical fiber of FIG. 4.

As shown in FIG. 5, the red, green, and blue laser lights 511, 512, and 513 are respectively incident on the optical fibers branched from the optical fiber incidence part 52.

Light incident on the optical fiber is totally reflected by the refractive index difference between the optical fiber core 53 and the optical fiber cladding 54 to travel along the optical fiber core 53.

In the optical fiber fusion unit 55, the core portion of each optical fiber is fused to form one optical fiber core.

The laser light that has progressed through each optical fiber in the optical fiber fusion unit 55 is mixed with each other in one optical fiber core 53 to become white light and is emitted from the optical fiber output unit 56.

In this way, by combining the plurality of optical fibers into one in the middle, by configuring the output unit with one optical fiber core, it is possible to solve the problem of collecting the optical fibers and the difficulty of vertically matching the optical fibers to the output side.

The laser light synthesized through the optical fiber 42 passes through the rotating color separation device 43.

The rotating color separation device 43 sequentially separates incident light into red, green, and blue light and advances the light to the display panel 45.

6 is a block diagram illustrating in detail the color separation apparatus of FIG. 4 and signal transmission thereof, and FIG. 7 is a timing diagram illustrating a change in an input / output signal of the color separation apparatus of FIG. 6.

As shown in FIG. 6, in order to realize a color image using one display panel, one color is sequentially displayed by dividing each color into a time when each color of red, green, and blue is displayed during a time forming one screen.

That is, a color screen is displayed by expressing each color of R, G, and B for 1/180 second for 60 Hz of one screen.

On the other hand, the rotating color separation device 43 separates and transmits the light of the corresponding color at the instant of displaying the corresponding color signal of the display panel 45.

The rotary color separation device 43 is divided into portions transmitting red, green, and blue, respectively. Therefore, while the rotary color separation device 43 rotates, light of red, green, and blue regions is sequentially irradiated and transmitted. That is, the color of the light transmitted sequentially is separated.

Accordingly, the display panel 45 operates to realize a color image with one display panel.

That is, after receiving the image signal, the image signal controller 48 separates each color signal, and sequentially rotates the colors to match the color separated by the color separation device 43 and the color signal of the display panel 45. The sensor 64 is disposed in the separation device to detect the color of the light transmitted from the rotating color separation device 43, and the image signal controller 48 transmits the corresponding color signal to the display panel 45.

As a result, the color separated by the rotating color separation device 43 and the color signal displayed on the display panel are synchronized to realize an accurate color image.

As shown in FIG. 4, the laser light transmitted through the color separation device 43 is illuminated on the display panel 45 by the illumination optical system 44.

The display panel 45 displays an image corresponding to the image signal by the image signal controller 48.

As described above, the color image is implemented by one display panel 45 and the same color signal as the color of the rotating color separation apparatus 43 is displayed to display the image.

The image implemented in the display panel 45 is magnified and projected by the projection optical system 46 to form an image on the screen 47.

An observer may view an image from the front or the back of the screen 47.

FIG. 8 is a configuration diagram illustrating a laser display device according to a second exemplary embodiment of the present invention, and FIG. 9 is a signal time configuration diagram illustrating input and output signals of the color separation apparatus of FIG. 8.

As shown in FIG. 8, the laser display device according to the second exemplary embodiment of the present invention synthesizes red, blue, and green lasers 711, 712, and 713 for outputting red, blue, and green laser lights, and synthesizes the respective laser lights. A display panel displaying an image by controlling an optical signal 72 for transmitting an optical signal, an illumination optical system 73 for focusing the synthesized laser light, and an amount of light incident through the illumination optical system 73 by an electrical signal. (74), a projection optical system (75) for magnifying and projecting the image, an image signal controller (77) for receiving an image signal input from the outside, and driving the display panel (74), and the projection optical system (75). It comprises a screen 76 for projecting the enlarged image through.

The laser display device according to the second embodiment of the present invention is implemented by receiving a signal before color fusion from each laser light source directly from the image signal controller without the rotation color separation device. Same as the first embodiment.

Here, the display device according to the second embodiment is synthesized through the optical fiber 72, the laser light of each color is fused and illuminated on the display panel 74 by the illumination optical system 73, the displayed image is a projection optical system ( 75 is magnified and projected onto the screen 76 to be implemented.

Meanwhile, the image signal controller 77 sequentially turns on / off the red, green, and blue lasers 711, 712, and 713 to sequentially adjust the light irradiated to the display panel 74.

As a result, a color image is realized by synchronizing the color of the light illuminated on the display panel 74 with the color signal.

8 is a time diagram for a color separation signal.

As illustrated in FIG. 8, the image signal controller 77 sequentially turns on / off the red, green, and blue lasers 711, 712, and 713 at R / G and B image signals at a rate of 1/60 second from the outside. on / off, i.e., the red, green, and blue signals are turned on / off at a speed of 1/180 sec. to sequentially adjust the light irradiated to the display panel 74 to obtain a normal signal. It outputs to the display panel 74, and projects it on the screen 76 through the projection optical system 75.

The laser display device of the present invention as described above has the following effects.

First, it effectively synthesizes and delivers laser light to improve the light efficiency to realize a bright and clear screen.

Second, the light distribution of each laser light is equalized to realize an image with uniform brightness on the screen.

Third, the system size can be reduced by simplifying the arrangement of the laser and the configuration of the optical system.

Claims (9)

Red, blue, and green lasers that output red, blue, and green laser light; An optical fiber for synthesizing the respective laser lights and transmitting an optical signal; A rotary color separation device for color separation of the optical signal; An illumination optical system for focusing the color-separated laser light; A display panel configured to display an image by adjusting an amount of light incident through the illumination optical system by an electrical signal; A projection optical system configured to enlarge and project the image; An image signal controller configured to receive an image signal input from the outside and drive the display panel; And a screen for projecting an image enlarged through the projection optical system. The method of claim 1, And laser light is synthesized by white light in the optical fiber and transmitted. The method of claim 2, The optical fiber is a laser display device, characterized in that the incidence is branched to receive light from each laser, the cores of the optical fibers are fused with each other in the middle of the progress of the light to form a single optical fiber, and output the light synthesized in the exit. The method of claim 3, wherein And the light incident on the optical fiber is totally reflected by the difference in refractive index between the core and the cladding to travel along the optical fiber core. The method of claim 1, And the image signal controller receives an image signal from the outside and matches the colors of the display panel and the rotating color separator. The method of claim 1, And the rotating color separation device sequentially separates and outputs the optical signal while rotating. The method of claim 1, The rotating color separation apparatus further includes a sensor for detecting whether the output color separation signal is synchronized with the image signal applied from the image signal controller to the display panel. Red, blue, and green lasers that output red, blue, and green laser light; An optical fiber for synthesizing the respective laser lights and transmitting an optical signal; An illumination optical system focusing the synthesized laser light; A display panel configured to display an image by adjusting an amount of light incident through the illumination optical system by an electrical signal; A projection optical system configured to enlarge and project the image; An image signal controller configured to receive an image signal input from the outside and drive the display panel; And a screen for projecting an image enlarged through the projection optical system. The method of claim 8, And the image signal controller receives the red, green, and blue laser lights, respectively, and sequentially turns them on and off to adjust the light irradiated onto the display panel.