KR20130110552A - Laser display apparatus and method thereof - Google Patents

Abstract

The present specification provides a laser display device capable of efficiently reducing speckle patterns or flicker phenomena caused by interference of light in a laser display device by adjusting a driving timing of a polarization conversion element to a blank time. Provide a method.
To this end, a laser display device according to an embodiment includes a light combining unit for synthesizing a plurality of linearly polarized light having different color lights incident from a laser light source; A polarization converting unit sequentially generating different polarizations having different phases based on the synthesized linear polarization; An image display unit which displays an image based on the different polarizations; A light detector for detecting information on sequential occurrence points of the different polarizations; And a controller configured to control the polarization converting unit so that sequential occurrences of the different polarizations are located within a blank time interval for the image based on the information on the occurrence points.

Description

LASER DISPLAY APPARATUS AND METHOD THEREOF

The present invention relates to a laser display device and a method thereof.

In general, a laser display device displays an image on a screen based on color light incident from a laser light source.

Provided are a laser display device and a method thereof, by adjusting a driving timing of a polarization conversion element to be blank time, thereby efficiently reducing a speckle pattern or flicker caused by light interference in a laser display device. Its purpose is to.

According to an aspect of the present invention, a laser display device includes: a light combiner configured to synthesize a plurality of linearly polarized light having different color lights incident from a laser light source; A polarization converting unit sequentially generating different polarizations having different phases based on the synthesized linear polarization; An image display unit which displays an image based on the different polarizations; A light detector for detecting information on sequential occurrence points of the different polarizations; And a controller configured to control the polarization converting unit so that sequential occurrences of the different polarizations are located within a blank time interval for the image based on the information on the occurrence points.

As an example related to the present specification, a blank time interval for the image is a time interval in which any one frame of an even frame and an odd frame corresponding to the image is changed to another frame. Can be.

As an example related to the present specification, the light detector generates a polarization generation signal including information on the generation time point, and the controller is configured to sequentially generate the different polarization points based on the polarization generation signal. The polarization converter may be controlled to be positioned within a blank time section for the image.

As an example related to the present specification, the controller may be configured to sequentially position different polarization points based on the polarization generation signal and the image synchronization signal for the image within a blank time interval for the image. It may be to control the polarization converting unit.

As an example associated with the present specification, the image synchronization signal may be at least one of a vertical synchronizing signal (Vsync, vertical synchronizing signal), a video blank signal (Vblank), and a display enable signal (VDE).

As an example related to the present specification, the controller may generate a polarization control signal based on the polarization generation signal and the image synchronization signal, and sequentially generate time points of the different polarizations based on the polarization control signal. The polarization converter may be controlled to be positioned within a blank time interval with respect to.

As an example related to the present specification, the different polarizations may be different linear polarizations having different phases.

As an example related to the present specification, the different linearly polarized light may be a first linearly polarized light and a second linearly polarized light having a phase difference of 180 degrees from each other.

As an example related to the present specification, the polarization converting unit may include a liquid crystal LC that sequentially generates the first linearly polarized light and the second linearly polarized light based on the synthesized linearly polarized light.

As an example related to the present specification, the light detector may include: a linear polarizer configured to pass linear polarization of any one of the first linearly polarized light and the second linearly polarized light; And a photo detector (PD) for generating a polarization generating signal including information on the generation point based on the linear polarization, wherein the controller is configured to perform the polarization generating signal and the image. Generating a polarization control signal based on an image synchronization signal, and controlling the polarization conversion unit such that sequential occurrences of the different polarizations are located within a blank time interval for the image based on the polarization control signal; Can be.

As an example related to the present specification, the apparatus may further include a transflective mirror which transmits the first linearly polarized light and the second linearly polarized light to the light detector by adjusting a movement path of the first linearly polarized light and the second linearly polarized light. It may be.

As an example related to the present specification, the first linearly polarized light may be linearly polarized light corresponding to an even frame, and the second linearly polarized light may be linearly polarized light corresponding to an odd frame. .

As an example related to the present specification, the different polarizations may be different circular polarizations having different phases.

As an example related to the present specification, the different circularly polarized light may be right circularly polarized light and left circularly polarized light.

As an example related to the present specification, the polarization converting unit sequentially generates first linearly polarized light and second linearly polarized light having different phases, converts the first linearly polarized light into the right circularly polarized light, and the second linearly polarized light. It may be to convert the polarized light into the left circle polarized light.

As an example related to the present specification, the first linearly polarized light and the second linearly polarized light may have phase differences of 180 degrees with each other.

As an example related to the present specification, the polarization converter may include: a liquid crystal (LC) which sequentially generates the first linearly polarized light and the second linearly polarized light based on the linearly polarized light; And a wavelength plate converting the first linearly polarized light into the right circularly polarized light and converting the second linearly polarized light into the left circularly polarized light.

As an example related to the present specification, the wavelength plate may be a quarter wave plate.

As an example related to the present specification, the angle formed by the fast axis direction of the quarter wave plate may be 45 degrees.

As an example related to the present specification, the polarization converting unit converts the synthesized linear polarized light into circularly polarized light and sequentially converts the first circularly polarized light and the second circularly polarized light having different phases based on the converted circularly polarized light. May occur.

As an example related to the present specification, the polarization converting unit may include: a wavelength plate configured to convert the synthesized linearly polarized light into circularly polarized light; The liquid crystal LC may sequentially generate right circularly polarized light and left circularly polarized light having a phase difference of 180 degrees based on the circularly polarized light.

As an example related to the present specification, the light detector may include: a detection wavelength plate converting the right circularly polarized light into a third linearly polarized light and converting the left circularly polarized light into a fourth linearly polarized light; A linear polarizer configured to pass linear polarization of any one of the third linearly polarized light and the fourth linearly polarized light; And a photo detector (PD) for generating a polarization generating signal including information on the generation point based on the linear polarization, wherein the controller is configured to perform the polarization generating signal and the image. Generating a polarization control signal based on an image synchronization signal, and controlling the polarization conversion unit such that sequential occurrences of the different polarizations are located within a blank time interval for the image based on the polarization control signal; Can be.

As an example related to the present specification, the photodetection wavelength plate may be a quarter wave plate.

As an example related to the present specification, the right circular polarization and the left circular polarization may further include a transflective mirror which transmits the right circular polarization and the left circular polarization by transmitting the left circular polarization.

As an example related to the present specification, the optical synthesizing unit may include a video processor generating color information corresponding to a video signal; A laser driver for generating control signals for generating color lights based on the color information generated by the video processor; A plurality of color light generators generating a plurality of color lights according to the control signals; And a plurality of collimators for generating a plurality of linear polarizations corresponding to the plurality of color lights.

As an example related to the present specification, the image display unit may include: a mirror reflecting different polarizations incident from the polarization converting unit; An image generator generating a scan image based on different polarizations reflected by the mirror; And a screen displaying the scanned image.

As an example related to the present specification, the control unit obtains an image synchronization signal for the image from the video processor, and adjusts a generation point of the color lights based on the image synchronization signal and information on the occurrence time. The laser driver and the image generator may be controlled to sequentially generate different polarization points within a blank time section of the image.

As an example related to the present specification, the controller may adjust the generation time of the color lights and the generation time of the scan image.

As an example associated with the present specification, the image synchronization signal may be at least one of a vertical synchronizing signal (Vsync, vertical synchronizing signal), a video blank signal (Vblank), and a display enable signal (VDE).

A laser display method according to the present disclosure for achieving the above object comprises the steps of: synthesizing a plurality of linearly polarized light having different color lights incident from a laser light source; Sequentially generating different polarizations having different phases based on the synthesized linear polarization; Displaying an image based on the different polarizations; Detecting information on sequential occurrence points of the different polarizations; And generating the different polarizations so that the sequential generation points of the different polarizations are located within a blank time interval for the image based on the information on the generation points.

According to one embodiment disclosed herein, a laser display device and a method thereof are provided.

In particular, according to the present disclosure, by adjusting the driving timing of the polarization conversion element to match the blank time, it is possible to efficiently reduce the speckle pattern or flicker phenomenon caused by the interference phenomenon of light in the laser display device. There is an advantage.

1 is a configuration diagram illustrating a configuration of a laser display device according to an exemplary embodiment disclosed herein.
2 is an exemplary view illustrating an operation of a polarization converting unit according to an embodiment disclosed in the present specification.
3 is an exemplary view showing circular polarization according to an embodiment disclosed in the present specification.
4 is a flowchart illustrating a laser display method according to an exemplary embodiment disclosed herein.
5 is a configuration diagram illustrating a configuration of a laser display device according to another exemplary embodiment disclosed herein.
6 is a flowchart illustrating a laser display method according to another exemplary embodiment disclosed herein.
7 is a configuration diagram illustrating a configuration of a laser display device according to another exemplary embodiment disclosed herein.
8 is a flowchart illustrating a laser display method according to another exemplary embodiment disclosed herein.
9 is a block diagram illustrating a configuration of a laser display device having a driving timing control function according to embodiments disclosed herein.
10 is a flowchart illustrating a laser display method according to embodiments disclosed herein.
11 is an exemplary view illustrating a laser display device according to a first embodiment disclosed herein.
12 is an exemplary view illustrating an operation of a laser display device according to a first embodiment disclosed herein.
13 is an exemplary view illustrating a laser display device according to a second embodiment disclosed herein.
14 is an exemplary view illustrating a laser display device according to a third embodiment disclosed herein.
15 is an exemplary view illustrating a laser display device according to a fourth embodiment disclosed herein.

The technology disclosed herein may be applied to a laser display device (or laser display device) and a display method. However, the technology disclosed herein is not limited thereto, and may be used in all display devices, devices, and display methods to which the technical spirit of the technology may be applied.

It is noted that the technical terms used herein are used only to describe specific embodiments and are not intended to limit the scope of the technology disclosed herein. Also, the technical terms used herein should be interpreted as being generally understood by those skilled in the art to which the presently disclosed subject matter belongs, unless the context clearly dictates otherwise in this specification, Should not be construed in a broader sense, or interpreted in an oversimplified sense. In addition, when a technical term used in this specification is an erroneous technical term that does not accurately express the concept of the technology disclosed in this specification, it should be understood that technical terms which can be understood by a person skilled in the art are replaced. Also, the general terms used in the present specification should be interpreted in accordance with the predefined or prior context, and should not be construed as being excessively reduced in meaning.

Also, the singular forms "as used herein include plural referents unless the context clearly dictates otherwise. In this specification, the terms "comprising ", or" comprising "and the like should not be construed as necessarily including the various elements or steps described in the specification, Or may be further comprised of additional components or steps.

Further, the suffix "module" and "part" for the components used in the present specification are given or mixed in consideration of ease of description, and do not have their own meaning or role.

Furthermore, terms including ordinals such as first, second, etc. used in this specification can be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted.

Further, in the description of the technology disclosed in this specification, a detailed description of related arts will be omitted if it is determined that the gist of the technology disclosed in this specification may be obscured. It is to be noted that the attached drawings are only for the purpose of easily understanding the concept of the technology disclosed in the present specification, and should not be construed as limiting the spirit of the technology by the attached drawings.

Speckle  Patterns and Flicker  General description of laser displays and methods that can reduce the phenomenon

Hereinafter, embodiments of the present invention may reduce speckle patterns and flicker phenomena by generating different circularly polarized light having different phases (for example, right polarized light and left circularly polarized light having different phases). A laser display device and a method thereof will be described with reference to FIGS. 1 to 8.

1 is a configuration diagram illustrating a configuration of a laser display device according to an exemplary embodiment disclosed herein.

As shown in FIG. 1, a laser display device according to an embodiment synthesizes a plurality of linearly polarized light having different color lights (for example, tricolor light: Red / Green / Blue) incident from a laser light source. A light combining unit 100; From the synthesized linearly polarized light, first linearly polarized light (for example, P wave) and second linearly polarized light (for example, S wave) having different phases (with phase difference) are sequentially (sequentially spaced apart). And a polarization converting unit 200 for converting the first linearly polarized light and the second linearly polarized light into different circularly polarized light (eg, right circularly polarized light and left circularly polarized light); The image display unit 300 displays an image based on the different circularly polarized light.

The light synthesizing unit 100 includes: a video processor 101 generating color information (for example, RGB (Red, Green, Blue) information) corresponding to a video signal (image); A laser driver for generating a control signal for generating color light (for example, red light, green light, blue light) based on the color information generated by the video processor 101. (Laser Driver) 102; A plurality of color light generators (for example, red light) for generating a plurality of color lights (for example, red light, green light, and blue light) according to the control signal. A generator, a green light generator, a blue light generator) (103, 104, 105); It may further comprise a plurality of collimators 106, 107, 108 generating a plurality of linear polarizations corresponding to the plurality of color lights. The light combiner 100 synthesizes the plurality of linear polarizations and outputs the synthesized light to the polarization converting unit 200. Here, the video processor 101, the laser driver 102, the plurality of color light generators 103, 104, 105, and the collimators 106, 107, 108 are already known in a laser display device such as a laser projector. Since it is a technology, a detailed description thereof will be omitted.

The image display unit 300 includes: a mirror 301 which reflects the different circularly polarized light incident from the polarization converting unit 200; An image generator (eg, a 2D scanner or a 3D image generator) 302 for generating an image based on different circular polarizations reflected by the mirror 301; It may be configured as a screen 303 for displaying the image.

The first linearly polarized light and the second linearly polarized light may have a phase difference of π (180 degrees) from each other.

The polarization converting unit 200 converts the first linearly polarized light into right circularly polarized light and converts the second linearly polarized light into left circularly polarized light. The polarization converting unit 200 may convert the first linearly polarized light into left circularly polarized light and convert the second linearly polarized light into right circularly polarized light.

The polarization converting unit 200 includes a liquid crystal (LC) 201 sequentially generating first linearly polarized light and second linearly polarized light having a phase difference of π from the linearly polarized light; A wavelength plate 202 may be included to convert the first linearly polarized light into right circularly polarized light and the second linearly polarized light into left circularly polarized light.

The LC 201 generates two different linearly polarized light having a phase difference of 180 degrees while repeatedly performing turn-on / turn-off operations.

The wave plate 202 may be a quarter wave plate (QWP), and the angle formed by the fast axis direction of the quarter wave plate may be 45 degrees. The fast axis refers to a polarization direction with a small refractive index.

Hereinafter, the operation of the laser display device according to the exemplary embodiment disclosed herein will be described.

First, the laser light output through the light synthesizing unit 100 has a linear polarization component by the plurality of collimators 106, 107, and 108, and is driven at a (frame rate) / 2. The polarization converting unit (eg, the LC included in the polarization changing unit) 200 may be provided to the even frame and the odd frame from the linear polarization component output through the light combining unit 100. Each produces two kinds of linear polarizations that are independent of each other. For example, the LC 201 generates a first linearly polarized light and a second linearly polarized light having a phase difference of π from each other, and outputs the generated first linearly polarized light and the second linearly polarized light to the wavelength plate 202. do. Here, one image frame includes one even frame and one odd frame.

The two linearly polarized light having a phase difference of π (180 degrees) from each other are displayed on the screen 303 at a frame rate / 2 speed, and generate two different speckle patterns. These speckle patterns are averaged during the integration time of the cell and the speckle pattern felt in the human eye

. In this case, two P waves (eg, first linearly polarized light) and S waves (eg, second linearly polarized light) having a phase difference of π from each other in an Even frame and an odd frame When linear polarization is used, the amount of light (light) applied to the human eye is scattered (scattered) in the screen 303 due to the directionality of the linear polarization so that a difference occurs according to the human viewing angle. Accordingly, the difference in brightness of each frame by the screen 303 may be felt by the viewer as flicker, which may cause an uncomfortable viewing condition. Therefore, in order to alleviate the difference in the amount of reflection scattering due to the linearly polarized light, a right circular polarization and a left circular polarization having phase differences of π, respectively corresponding to the Even frame and the odd frame, are generated. It is possible to reduce the flicker phenomenon in the screen 303 by greatly reducing the brightness difference of the polarization generated according to the viewing angle while maintaining the clock reduction effect.

The speckle refers to a phenomenon in which interference of light occurs as the laser light source proceeds so that locally bright spots appear on the screen 303 in a constant pattern.

2 is an exemplary view illustrating an operation of a polarization converting unit according to an embodiment disclosed in the present specification.

As shown in FIG. 2, the LC 201 converts linearly polarized light incident from the light combiner 100 into two linearly polarized light (first linearly polarized light and second linearly polarized light) having a phase difference of π. modulate and output the converted two linearly polarized light to the wavelength plate 202. The wavelength plate 202 is configured to offset the first linear polarization and the second linear polarization incident from the LC 201 by positioning the angle formed by the fast axis of the wavelength plate (QWP) 202 at 45 degrees. Two different circularly polarized light (e.g., right polarized light (2-1) and left circularly polarized light (2-2), and the converted two circularly polarized light (right polarized light and left circular polarized light having a phase difference of π of each other). Is sequentially output to the image display unit 300 with a parallax.

3 is an exemplary view showing circular polarization according to an embodiment disclosed in the present specification.

As shown in FIG. 3, two independent speckle patterns are generated during the integration time of the observer by right polarized light and left circular polarized light having a phase difference of 180 degrees, which are sequentially incident on the screen 303 at a time difference. By creating Speckle pattern1, Speckle pattern2)

At the same time as the speckle pattern is reduced, the flicker phenomenon in the screen 303 is also reduced.

Hereinafter, a laser display method according to an exemplary embodiment disclosed herein will be described with reference to FIGS. 1 and 4.

4 is a flowchart illustrating a laser display method according to an exemplary embodiment disclosed herein.

First, the light synthesizing unit 100 has different color lights (for example, three-color light: red / green / blue) incident from a laser light source (for example, a plurality of color light generating units 103, 104, and 105). A plurality of linearly polarized light having a) are synthesized, and the synthesized light is output to the polarization converting unit 200 (S11).

The polarization converting unit 200 sequentially performs the first linearly polarized light (for example, P wave) and the second linearly polarized light (for example, S wave) having different phases from the synthesized linearly polarized light (sequence difference). And sequentially) (S12). For example, the polarization converter 200 sequentially generates the first linearly polarized light and the second linearly polarized light having a phase difference of 180 degrees from the synthesized linearly polarized light sequentially. Here, the first linearly polarized light may be linearly polarized light corresponding to the even frame, and the second frame may be linearly polarized light corresponding to the odd frame.

The polarization converting unit 200 converts the sequentially generated first linear polarization and the second linear polarization into different circular polarizations, and sequentially outputs the converted circular polarizations to the image display unit 300 ( S13). For example, the polarization converting unit 200 converts the sequentially generated first linearly polarized light into right circularly polarized light, converts the second linearly polarized light into left circularly polarized light, and sequentially converts the converted right circularly and left circularly polarized light. Output to the image display unit 300. The polarization converting unit 200 converts the sequentially generated first linearly polarized light into left circularly polarized light, converts the second linearly polarized light into right circularly polarized light, and sequentially converts the converted left circle and right circularly polarized light into the image display unit ( 300).

The image display unit 300 generates an image based on the different circularly polarized light outputs sequentially, and displays the generated image (S14). For example, the image display unit 300 converts the sequentially output right circular polarization and left circular polarization into an image through the mirror 301 and the image generator 302, and converts the converted image to the screen 303. Display.

Accordingly, the laser display device and the method according to the exemplary embodiment disclosed herein may generate speckle patterns by generating different circularly polarized light having different phases (for example, right circularly polarized light and left circularly polarized light having different phases). And flicker phenomenon can be reduced together.

Hereinafter, a configuration of a laser display device according to another exemplary embodiment disclosed herein will be described with reference to FIG. 5.

5 is a configuration diagram illustrating a configuration of a laser display device according to another exemplary embodiment disclosed herein.

As shown in FIG. 5, a laser display device according to another exemplary embodiment disclosed herein includes a plurality of different color lights (eg, tri-color light: Red / Green / Blue) incident from a laser light source. A light combiner 100 for synthesizing linearly polarized light; From the synthesized linearly polarized light, first linearly polarized light (for example, P wave) and second linearly polarized light (for example, S wave) having different phases (with phase difference) are sequentially (sequentially spaced apart). Polarization conversion units 401 and 402 generated; The image display unit 300 generates and displays an image based on the first linear polarization and the second linear polarized light having different phases, wherein the polarization converters 401 and 402 correspond to the image. The first linearly polarized light and the second linearly polarized light are converted into different circularly polarized light (eg, right circularly polarized light and left circularly polarized light), and the converted circularly polarized light is output to the screen 303. For example, the polarization converters 401 and 402 may include a liquid crystal (LC) 401 which sequentially generates first linearly polarized light and second linearly polarized light having a phase difference of 180 degrees from the synthesized light; The first linearly polarized light and the second linearly polarized light corresponding to an image output through the image generator 302 may be configured as wavelength plates 402 which sequentially convert left circularly polarized light and right circularly polarized light, respectively.

The light synthesizing unit 100 includes: a video processor 101 generating color information (for example, RGB (Red, Green, Blue) information) corresponding to a video signal (image); A laser driver for generating a control signal for generating color light (for example, red light, green light, blue light) based on the color information generated by the video processor 101. (Laser Driver) 102; A plurality of color light generators (for example, red light) for generating a plurality of color lights (for example, red light, green light, and blue light) according to the control signal. A generator, a green light generator, a blue light generator) (103, 104, 105); It may further comprise a plurality of collimators 106, 107, 108 generating a plurality of linear polarizations corresponding to the plurality of color lights. The light combining unit 100 synthesizes the plurality of linear polarizations, and outputs the synthesized light to the LC 401 of the polarization converting unit.

The image display unit 300 includes: a mirror 301 which reflects first linearly polarized light and second linearly polarized light having the different phases sequentially input from the LC 401; An image generator (eg, a 2D scanner or a 3D image generator) 302 for generating an image based on the first linear polarization and the second linear polarization reflected by the mirror 301; It may be configured as a screen 303 for displaying the image. Here, the wavelength plate 402 of the polarization converting unit sequentially converts the first linearly polarized light and the second linearly polarized light corresponding to the image output through the image generator 302 into left circle polarization and right circle polarization, respectively. To the screen 303.

The first linearly polarized light and the second linearly polarized light may have a phase difference of π (180 degrees) from each other.

The wavelength plate 402 converts the first linearly polarized light into right circularly polarized light and converts the second linearly polarized light into left circularly polarized light. The wavelength plate 402 may convert the first linearly polarized light into left circularly polarized light and convert the second linearly polarized light into right circularly polarized light.

The wave plate 202 may be a quarter wave plate (QWP), and the angle formed by the fast axis direction of the quarter wave plate may be 45 degrees. The fast axis refers to a polarization direction with a small refractive index.

Hereinafter, a laser display method according to another exemplary embodiment disclosed herein will be described with reference to FIGS. 5 and 6.

6 is a flowchart illustrating a laser display method according to another exemplary embodiment disclosed herein.

First, the light synthesizing unit 100 has different color lights (for example, three-color light: red / green / blue) incident from a laser light source (for example, a plurality of color light generating units 103, 104, and 105). A plurality of linearly polarized light having a) are synthesized, and the synthesized light is output to the liquid crystal (LC) 401 (S21).

The liquid crystal (LC) 401 sequentially (parallelizes) a first linearly polarized light (eg, P wave) and a second linearly polarized light (eg, S wave) having different phases from the synthesized linearly polarized light. Sequentially)) (S22). For example, the liquid crystal (LC) 401 sequentially generates the first linearly polarized light and the second linearly polarized light having a phase difference of 180 degrees from the synthesized linearly polarized light sequentially. Here, the first linearly polarized light may be linearly polarized light corresponding to the even frame, and the second frame may be linearly polarized light corresponding to the odd frame.

The liquid crystal (LC) 401 sequentially outputs the first linearly polarized light and the second linearly polarized light having a phase difference of 180 degrees to the image display part 300.

The image display unit 300 generates an image based on the first linearly polarized light and the second linearly polarized light sequentially output, and outputs the generated image (S23). For example, the image display unit 300 converts the first linearly polarized light and the second linearly polarized light sequentially into an image through the mirror 301 and the image generator 302, and converts the converted image into the image. Output to the wave plate 402.

The wavelength plate 402 corresponds to the image, and sequentially converts the first linearly polarized light and the second linearly polarized light into different circularly polarized light, and outputs the converted circularly polarized light to the screen 303. (S24) For example, the wavelength plate 402 converts the first linearly polarized light corresponding to the images sequentially output from the image generator 302 into right circularly polarized light, and the first linearly polarized light from the image generator 302. The second linearly polarized light corresponding to the image output at a time difference from the polarized light is converted into left circularly polarized light, and the converted right circularly polarized light and the left circularly polarized light are sequentially output to the screen 303. The wavelength plate 402 may convert the first linearly polarized light into left circularly polarized light and convert the second linearly polarized light into right circularly polarized light.

Therefore, the laser display device and the method according to another embodiment disclosed herein are specified by generating different circularly polarized light having different phases (for example, right circularly polarized light and left circularly polarized light having different phases). It is possible to reduce the cleat pattern and the flicker phenomenon together.

Hereinafter, a configuration of a laser display device according to another exemplary embodiment disclosed herein will be described with reference to FIG. 7.

7 is a configuration diagram illustrating a configuration of a laser display device according to another exemplary embodiment disclosed herein.

As shown in FIG. 7, a laser display device according to another exemplary embodiment disclosed herein includes a plurality of different color lights (eg, tricolor light: Red / Green / Blue) incident from a laser light source. A light combiner 100 for synthesizing linearly polarized light; Converts the synthesized linearly polarized light into circularly polarized light (for example, left circularly or rightly polarized light), and based on the converted circularly polarized light, first circularly polarized light (for example, having a phase difference) A polarization converting unit 500 for generating left circularly polarized light and second circularly polarized light (eg, right circularly polarized light) in sequence (sequentially with parallax); The image display unit 300 displays an image based on the different circularly polarized light.

The polarization converter 500 includes: a wavelength plate 501 for converting the synthesized linearly polarized light into circularly polarized light; The liquid crystal (LC) 502 may sequentially generate left circularly polarized light and right circularly polarized light having a phase difference of 180 degrees from the circularly polarized light.

The light synthesizing unit 100 includes: a video processor 101 generating color information (for example, RGB (Red, Green, Blue) information) corresponding to a video signal (image); A laser driver for generating a control signal for generating color light (for example, red light, green light, blue light) based on the color information generated by the video processor 101. (Laser Driver) 102; A plurality of color light generators (for example, red light) for generating a plurality of color lights (for example, red light, green light, and blue light) according to the control signal. A generator, a green light generator, a blue light generator) (103, 104, 105); It may further comprise a plurality of collimators 106, 107, 108 generating a plurality of linear polarizations corresponding to the plurality of color lights. The light synthesizing unit 100 synthesizes the plurality of linear polarizations and outputs the synthesized linear polarizations to the polarization converting unit 500.

The image display unit 300 includes: a mirror 301 which reflects the different circular polarizations which are sequentially incident from the polarization converting unit 500; An image generator (eg, a 2D scanner or a 3D image generator) 302 for generating an image based on different circular polarizations reflected by the mirror 301; It may be configured as a screen 303 for displaying the image.

The first circularly polarized light and the second circularly polarized light may have a phase difference of π (180 degrees) from each other.

The polarization converter 500 sequentially performs left circle polarization generated by the wavelength plate 501 into right circle polarization and left circle polarization having a phase of 180 degrees from each other by a turn-on / turn-off operation of the liquid crystal (LC) 502. Convert to For example, when the synthesized linear polarized light by the wavelength plate 501 is converted into right polarized light, the liquid crystal (LC) 502 converts the right polarized light to left circular polarized light in a turn-off state, and turns The unidirectional polarized light is output as it is in -ON state. On the other hand, when the synthesized linearly polarized light by the wavelength plate 501 is converted into left circularly polarized light, the liquid crystal (LC) 502 converts the left circularly polarized light into right circularly polarized light in a turn-off state, and turns on The left circle polarized light is output as it is. Accordingly, right-circular polarization and left-circular polarization having phases of 180 degrees are sequentially output by the turn-on / turn-off operation of the liquid crystal (LC) 502.

Hereinafter, a laser display method according to another exemplary embodiment disclosed herein will be described with reference to FIGS. 7 and 8.

8 is a flowchart illustrating a laser display method according to another exemplary embodiment disclosed herein.

First, the light synthesizing unit 100 has different color lights (for example, three-color light: red / green / blue) incident from a laser light source (for example, a plurality of color light generating units 103, 104, and 105). A plurality of linearly polarized light having a) is synthesized and the synthesized linearly polarized light is output to the polarization converting unit 500 (S31).

The polarization converting unit 500 converts the synthesized linear polarization into circular polarization (S32). For example, the wavelength plate 501 converts the synthesized linear polarization into left circular polarization or right circular polarization.

The polarization converter 500 sequentially generates the first circularly polarized light and the second circularly polarized light by converting the phase of the circularly polarized light, and sequentially generates the first circularly polarized light and the second circularly polarized light. (S33-S34). For example, the liquid crystal (LC) 502 sequentially converts left circle polarization generated by the wavelength plate 501 into right circle polarization and left circle polarization with a parallax, and sequentially converts the right circle polarization and the left circle polarization into the image. Output to display unit 300. On the other hand, the liquid crystal (LC) 502 sequentially converts the right circularly polarized light generated by the wavelength plate 501 into left and right circularly polarized light at a time difference, and sequentially converts the left and right circularly polarized light and the right circularly polarized light into the image display unit ( 300).

The image display unit 300 generates an image based on different circularly polarized light outputs sequentially, and displays the generated image (S35). For example, the image display unit 300 converts the sequentially output right circular polarization and left circular polarization into an image through the mirror 301 and the image generator 302, and converts the converted image to the screen 303. Display.

Therefore, the laser display device and the method according to another embodiment disclosed herein are specified by generating different circularly polarized light having different phases (for example, right circularly polarized light and left circularly polarized light having different phases). It is possible to reduce the cleat pattern and the flicker phenomenon together.

As described above, the laser display device or the method according to the exemplary embodiment disclosed herein generates different circularly polarized light having different phases (for example, right circularly polarized light and left circularly polarized light having different phases). As a result, speckle patterns and flicker may be reduced together.

The In embodiments  Description of the laser display device having a driving timing control function

Laser display device having a driving timing control function according to the embodiments disclosed in the present specification, a light combining unit for synthesizing a plurality of linearly polarized light having different color light incident from a laser light source, based on the synthesized linear polarized light A polarization converting unit for sequentially generating different polarizations having different phases, an image display unit displaying an image based on the different polarizations, a light detection unit detecting information about the sequential occurrence points of the different polarizations, and The control unit may control the polarization converting unit so that the sequential occurrence points of the different polarizations are located within a blank time section for the image based on the information on the occurrence points.

9 is a block diagram illustrating a configuration of a laser display device having a driving timing control function according to embodiments disclosed herein.

Referring to FIG. 9, the laser display device 10 having the driving timing control function according to the embodiments of the present disclosure may include a light combiner 100, a polarization converter 200, an image display 300, The control unit N100 and the light detector N200 may be included.

In addition, the laser display device 10 may further include various components for reducing the speckle pattern and the flicker phenomenon by controlling the driving timing of the components included in the laser display device 10.

Since the components shown in FIG. 9 are not essential, the laser display device 10 having more or fewer components may be implemented.

Hereinafter, the components will be described in order.

First, the light combining unit 100 may play a role of synthesizing a plurality of linearly polarized light having different color lights incident from a laser light source.

To this end, the light synthesizing unit 100 generates color information (eg, RGB (Red, Green, Blue) information) corresponding to a video signal (or an image) and based on the generated color information. A plurality of color lights (eg, red light, green light, blue light) may be generated, and a plurality of linear polarizations corresponding to the plurality of color lights may be generated.

In addition, the light combining unit 100 may synthesize the plurality of linear polarizations and output the synthesized light to the polarization converting unit 200.

The polarization converting unit 200 may sequentially generate different polarizations having different phases based on the synthesized linear polarization. In addition, the polarization converter 200 may output (or transmit or transmit) the different polarizations to the image display unit 300.

According to an embodiment, the different polarizations may be different linear polarizations having different phases. For example, the different linearly polarized light may be a first linearly polarized light and a second linearly polarized light having a phase difference of 180 degrees from each other. In this case, the polarization converter 200 may sequentially generate the first linearly polarized light and the second linearly polarized light based on the synthesized linearly polarized light. The first linearly polarized light may be linearly polarized light corresponding to an even frame, and the second linearly polarized light may be linearly polarized light corresponding to an odd frame.

According to another embodiment, the different polarizations may be different circular polarizations having different phases. For example, the different circularly polarized light may be right circularly polarized light and left circularly polarized light. In this case, the polarization converter 200 sequentially generates the first linearly polarized light and the second linearly polarized light having different phases, converts the first linearly polarized light into the right circularly polarized light, and the second linearly polarized light. It may be to convert to the left circle polarized light. For example, the first linearly polarized light and the second linearly polarized light may have a phase difference of 180 degrees from each other.

According to another embodiment, the polarization converting unit 200 converts the synthesized linear polarized light into circular polarized light and based on the converted circular polarized light, the first circularly polarized light and the second circularly polarized light having different phases from each other. The polarization may be sequentially generated. For example, the first circularly polarized light may be right circularly polarized light, and the second circularly polarized light may be left circularly polarized light. In this case, the polarization converting unit 200 may convert the synthesized linearly polarized light into circularly polarized light and sequentially generate right circularly polarized light and left circularly polarized light having a phase difference of 180 degrees from each other based on the circularly polarized light. have.

The image display unit 300 may serve to display an image based on the different polarizations.

According to an embodiment, the different polarizations may be different linear polarizations having different phases. For example, the different linearly polarized light may be a first linearly polarized light and a second linearly polarized light having a phase difference of 180 degrees from each other.

In this case, the image display unit 300 reflects the first linearly polarized light and the second linearly polarized light having the different phases which are sequentially incident from the polarization converter 200, and the reflected first linearly polarized light and An image may be generated based on the second linearly polarized light. In addition, the image display unit 300 may output (or display) the image on a screen.

According to another embodiment, the different polarizations may be different circular polarizations having different phases. For example, the different circularly polarized light may be right circularly polarized light and left circularly polarized light.

In this case, the image display unit 300 may convert the sequentially output right circular polarization and left circular polarization into an image, and display the converted image on the screen.

According to another embodiment, the polarization converting unit 200 converts the synthesized linear polarized light into circular polarized light and based on the converted circular polarized light, the first circularly polarized light and the second circularly polarized light having different phases from each other. The polarization may be sequentially generated.

In this case, the image display unit 300 may convert the first circularly polarized light and the second circularly polarized light sequentially output to the image, and display the converted image on the screen.

The light detector N200 may serve to detect information about sequential occurrence points of the different polarizations.

The sequential occurrence of the different polarizations may mean an intersection point of the different polarizations.

According to an embodiment, the different polarizations may be different linear polarizations having different phases. For example, the different linearly polarized light may be a first linearly polarized light and a second linearly polarized light having a phase difference of 180 degrees from each other. Here, the first linearly polarized light may be linearly polarized light corresponding to an even frame, and the second linearly polarized light may be linearly polarized light corresponding to an odd frame.

In this case, the light detector N200 may detect a time point at which one of the first linearly polarized light and the second linearly polarized light is changed (or crossed) from one to the other as a sequential occurrence of the different polarizations. .

According to another embodiment, the different polarizations may be different circular polarizations having different phases. For example, the different circularly polarized light may be right circularly polarized light and left circularly polarized light.

In this case, the light detector N200 may detect a time point at which one of the right polarized light and the left circle polarized light is changed (or crossed) from one to the other as a sequential occurrence of the different polarized light.

According to another embodiment, the polarization converting unit 200 converts the synthesized linear polarized light into circular polarized light and based on the converted circular polarized light, the first circularly polarized light and the second circularly polarized light having different phases from each other. The polarization may be sequentially generated.

In this case, the light detector N200 may detect a time point at which one of the first circularly polarized light and the second circularly polarized light is changed (or crossed) from one to the other as a sequential occurrence of the different polarized light. .

The controller N200 may basically serve to control the components of the laser display device 10 (or drive timing control of the components) in order to adjust the timing of occurrence of different polarizations.

That is, the controller N200 controls the polarization converting unit 200 so that the sequential generation points of the different polarizations are located within a blank time interval for the image based on the information on the occurrence point. Can play a role.

According to an embodiment, the blank time interval for the image may be a time interval in which any one frame of the even frame and the odd frame corresponding to the image is changed to another frame. .

In addition, according to an embodiment, the light detector N200 may generate a polarization generation signal including information on the occurrence time. In this case, the controller N100 may control the polarization converting unit 200 so that the sequential generation points of the different polarizations are located within a blank time interval for the image based on the polarization generating signal. Can be.

According to an embodiment of the present disclosure, the controller N200 may include a blank time interval of the image based on the sequential generation time point of the different polarizations based on the polarization generation signal and the image synchronization signal for the image. It may be to control the polarization conversion unit to be located within.

In this case, the image synchronization signal may be at least one of a vertical synchronizing signal (Vsync, vertical synchronizing signal), a video blank signal (Vblank), and a display enable signal (VDE).

In addition, according to an embodiment, the controller N200 generates a polarization control signal based on the polarization generation signal and the image synchronization signal, and sequentially generates the different polarization points based on the polarization control signal. The polarization converter 200 may be controlled to be positioned in a blank time section of the image.

In addition, according to an embodiment, the light synthesizing unit 100 may include a video processor generating color information corresponding to a video signal, and control signals for generating color lights based on color information generated by the video processor. The laser driver may include a plurality of color light generators that generate a plurality of color lights according to the control signals, and a plurality of collimators that generate a plurality of linear polarizations corresponding to the plurality of color lights.

In addition, the image display unit 300 may include a mirror reflecting the different circular polarizations incident from the polarization converting unit, an image generating unit generating the scan image based on the different circular polarizations reflected by the mirrors, and the It may include a screen for displaying the scanned image.

In this case, the controller N200 obtains an image synchronization signal for the image from the video processor, and generates the color light and the scan image based on the image synchronization signal and information on the occurrence time. The laser driver and the image generator may be controlled such that the sequential occurrence points of the different polarizations are positioned within a blank time interval for the image by adjusting the occurrence time of.

The In embodiments  Laser Marking Method

According to embodiments of the present disclosure, a laser display method includes: synthesizing a plurality of linearly polarized light having different color lights incident from a laser light source, and differently polarized light having different phases based on the synthesized linearly polarized light. Generating sequentially, displaying an image based on the different polarizations, detecting information on sequential occurrence points of the different polarizations, and generating the different polarizations based on the information on the occurrence time points. And generating the different polarizations such that the sequential occurrence points of are located within a blank time interval for the image.

10 is a flowchart illustrating a laser display method according to embodiments disclosed herein.

Referring to FIG. 10, the laser display method according to the exemplary embodiments disclosed herein may include the following steps.

First, a plurality of linearly polarized light having different color lights incident from a laser light source may be synthesized (S110).

Next, different polarizations having different phases may be sequentially generated based on the synthesized linear polarization (S120).

Next, an image may be displayed based on the different polarizations (S130).

Next, information about the sequential occurrence of the different polarizations may be detected (S140).

Next, the different polarizations may be generated such that the sequential occurrences of the different polarizations are located within a blank time interval for the image based on the information on the occurrence time (S150).

1st Example

The first embodiment disclosed herein may be implemented as a part or a combination of the configurations or steps included in the above-described embodiments, or may be implemented as a combination of the embodiments. Hereinafter, a clear description of the first embodiment disclosed in this specification The overlapping part can be omitted.

The laser display device according to the first embodiment disclosed in the present specification includes a light combining unit for synthesizing a plurality of linearly polarized light having different color lights incident from a laser light source, and having different phases based on the synthesized linearly polarized light. A polarization converting unit that sequentially generates different polarizations, an image display unit displaying an image based on the different polarizations, a light detecting unit that detects information on sequential occurrence points of the different polarizations, and information on the occurrence time points The control unit may include a controller configured to control the polarization converting unit so that the sequential occurrence points of the different polarizations are located within a blank time interval for the image.

According to a first embodiment, the blank time interval for the image may be a time interval in which any one frame of the Even frame and the odd frame corresponding to the image is changed to another frame. have.

In addition, according to the first embodiment, the light detector generates a polarization generation signal including information on the generation time point, and the control unit, the sequential generation time point of the different polarizations based on the polarization generation signal The polarization converter may be controlled to be positioned within a blank time section for the image.

Further, according to the first embodiment, the control unit, based on the polarization generating signal and the image synchronization signal for the image, the sequential occurrence of the different polarization is located within a blank time interval for the image It may be to control the polarization conversion unit to.

In addition, according to the first embodiment, the image synchronization signal may be at least one of a vertical synchronization signal (Vsync, vertical synchronizing signal), a video blank signal (Vblank), and a display enable signal (VDE). .

In addition, according to the first embodiment, the controller generates a polarization control signal based on the polarization generation signal and the image synchronization signal, and the sequential generation time points of the different polarizations are based on the polarization control signal. The polarization converter may be controlled to be positioned within a blank time section of an image.

In addition, according to the first embodiment, the different polarizations may be different linear polarizations having different phases. For example, the different linearly polarized light may be a first linearly polarized light and a second linearly polarized light having a phase difference of 180 degrees from each other.

In addition, according to the first embodiment, the laser display device transfers the first linearly polarized light and the second linearly polarized light to the photodetector by adjusting a movement path of the first linearly polarized light and the second linearly polarized light. It may further include a transmission mirror.

11 is an exemplary view illustrating a laser display device according to a first embodiment disclosed herein.

Referring to FIG. 11, the laser display device 10 may include a light combiner 100, a polarization converting unit 200, an image display unit 300, a controller N100, and a light detector N200.

The light synthesizing unit 100 includes: a video processor 101 generating color information (for example, RGB (Red, Green, Blue) information) corresponding to a video signal (image); A laser driver for generating a control signal for generating color light (for example, red light, green light, blue light) based on the color information generated by the video processor 101. (Laser Driver) 102; A plurality of color light generators (for example, red light) for generating a plurality of color lights (for example, red light, green light, and blue light) according to the control signal. A generator, a green light generator, a blue light generator) (103, 104, 105); It may further comprise a plurality of collimators 106, 107, 108 generating a plurality of linear polarizations corresponding to the plurality of color lights. The light combiner 100 synthesizes the plurality of linear polarizations and outputs the synthesized light to the polarization converting unit 200. Here, the video processor 101, the laser driver 102, the plurality of color light generators 103, 104, 105, and the collimators 106, 107, 108 are already known in a laser display device such as a laser projector. Since it is a technology, a detailed description thereof will be omitted.

The polarization converter 200 may include liquid crystals LC and E110 that sequentially generate the first linearly polarized light and the second linearly polarized light based on the synthesized linearly polarized light.

The laser light output through the light synthesizing unit 100 has a linear polarization component by the plurality of collimators 106, 107, and 108, and the liquid crystal driving at a frame rate / 2. The LC and E110 generate two types of linearly polarized light independent from each other corresponding to the even frame and the odd frame, respectively, from the linear polarization component output through the light combiner 100. For example, the LC E110 may generate first linearly polarized light and second linearly polarized light having a phase difference of π with each other. Here, one image frame may include one even frame and one odd frame. The first linear polarized light may be linear polarized light corresponding to an even frame, and the second linear polarized light may be linear polarized light corresponding to an odd frame.

The image display unit 300 includes: a mirror 301 reflecting first linearly polarized light and second linearly polarized light having the different phases sequentially input from the LC E110; An image generator (eg, a 2D scanner or a 3D image generator) 302 for generating an image based on the first linearly polarized light and the second linearly polarized light reflected by the mirror 301; It may be configured as a screen 303 for displaying the image.

The light detector N200 may be configured based on a linear polarizer N211 through which any one of the first linearly polarized light and the second linearly polarized light is passed, and the linearly polarized light N211. It may include a photo detector (PD, N212) for generating a polarization generating signal containing information.

In addition, the light detector N200 transmits the first linearly polarized light and the second linearly polarized light to the light detector N200 by adjusting the movement paths of the first linearly polarized light and the second linearly polarized light. It may further include (N220).

The control unit N100 generates a polarization control signal based on the polarization generation signal and the image synchronization signal for the image, and based on the polarization control signal, the sequential generation time point of the different polarizations is blank for the image. The polarization converter 200 may be controlled to be positioned within a blank time interval. Here, the polarization control signal may serve to control the driving timing of the polarization converting unit 200, and the sequential generation time of the first linear polarization and the second linear polarization is adjusted through the driving timing control. Can be. That is, the polarization control signal may serve to control the polarization conversion unit 200 such that the generation point is located within a blank time section for the image. Here, the blank time section for the image may be a time section in which any one frame of the even frame and the odd frame corresponding to the image is changed to another frame.

12 is an exemplary view illustrating an operation of a laser display device according to a first embodiment disclosed herein.

12 (a) shows the operation of the general polarization converter.

Referring to FIG. 12A, the general polarization converter may include a liquid crystal LC that sequentially generates the first linearly polarized light and the second linearly polarized light based on the synthesized linearly polarized light.

The light combiner synthesizing a plurality of linearly polarized light having different color light incident from the laser light source may transmit the LC driving signal S110 for the LC to the general polarization converting unit.

In detail, a video processor for generating color information corresponding to the video signal by the light synthesizing unit, a laser driver generating control signals for generating color lights based on the color information generated by the video processor, and the control signals. And the plurality of color light generators for generating a plurality of color lights and a plurality of collimators for generating a plurality of linear polarizations corresponding to the plurality of color lights, the LC driving signal S110 is generated by the video processor. Can be generated.

The LC driving signal S110 may control (or adjust) a sequential generation time for the first linearly polarized light and the second linearly polarized light by driving the LC.

In this case, the LC response signal S120 for the LC controlled by the LC driving signal S110 may be confirmed.

The LC response signal S120 transitions after a predetermined delay time from a signal transition point (rising or falling edge) of the LC driving signal S110. Accordingly, the signal transition time point of the LC response signal S120 may mean a sequential generation time point (or crossing time point) for the first linear polarization and the second linear polarization.

12 (b) shows the operation of the polarization converting unit according to the first embodiment disclosed herein.

Referring to FIG. 12B, the controller N100 may receive (or acquire) an image synchronization signal for an image from the video processor 101. For example, the image synchronization signal may be at least one of a vertical sync signal (Vsync, vertical synchronizing signal, S210), a video blank signal (Vblank, S220), and a display enable signal (VDE, Display Enable signal, not shown). have.

The controller N100 may generate a polarization control signal based on the polarization generation signal and the image synchronization signal. For example, as illustrated in FIG. 12B, the controller N100 may generate a polarization control signal (eg, an LC driving signal S310) based on the vertical synchronization signal S210. In this case, the LC driving signal S310 may be generated by delaying the vertical synchronization signal S210 by a predetermined delay time.

The polarization converter 200 may sequentially generate the first linearly polarized light and the second linearly polarized light from the synthesized linearly polarized light based on the LC driving signal S310. Specifically, sequential generation of the first linearly polarized light and the second linearly polarized light may be performed by the LC E110.

The linear polarizer N211 of the light detector N200 may pass the linearly polarized light of any one of the first linearly polarized light and the second linearly polarized light.

In addition, the photodetectors PD and N212 of the photodetector N200 may generate a polarization generation signal including information on the occurrence time based on the linear polarization.

For example, the linear polarizer N211 may pass the first linearly polarized light among the first linearly polarized light and the second linearly polarized light. In this case, the photo detectors PD and N212 may detect the first linearly polarized light that has passed through the linear polarizer N211. Since the second linearly polarized light does not pass through the linear polarizer N212, the output of the photodetector N212 responds only to the first linearly polarized light, and the photodetector N212 detects the first linearly polarized light. Based on the polarization generating signal (for example, LC response signal, S320) including the information on the generation time can be generated.

Referring to the waveform of the LC response signal S320 shown in FIG. 12B, when the first linear polarization is detected, the waveform corresponds to a high level (or high state) of the waveform, and the first linear polarization is If not detected, it may correspond to a low level (or low state) of the waveform.

The control unit N100 is located within a blank time interval for the image based on the vertical synchronization signal S210 and the LC response signal S320 or the polarization generating signal. The polarization converter 200 may be controlled.

Specifically, the control unit N100 delays the LC driving signal S310 by a specific delay time based on the falling edge of the vertical synchronization signal S210 (which may be a rising edge according to another embodiment). The delay time of the LC driving signal S310 may be adjusted such that the LC response signal S320 is positioned in a low section of the video blank signals Vblank and S220. Therefore, when the LC response signal S320 is located in the low section of the video blank signals Vblank and S220 (in another embodiment, the LC response signal S320 may be a high section), the sequential of the different polarizations The occurrence point may be located within a blank time interval for the image.

Second Example

The second embodiment disclosed herein may be implemented as a part or a combination of the configurations or steps included in the above-described embodiments, or may be implemented as a combination of the embodiments. Hereinafter, a clear description of the second embodiment disclosed in this specification The overlapping part can be omitted.

The laser display device according to the second embodiment of the present disclosure includes an optical combiner for synthesizing a plurality of linearly polarized light having different color lights incident from a laser light source, and having different phases based on the synthesized linearly polarized light. A polarization converting unit that sequentially generates different polarizations, an image display unit displaying an image based on the different polarizations, a light detecting unit that detects information on sequential occurrence points of the different polarizations, and information on the occurrence time points The control unit may include a controller configured to control the polarization converting unit so that the sequential occurrence points of the different polarizations are located within a blank time interval for the image.

According to the second embodiment, the different polarizations may be different circular polarizations having different phases.

In addition, according to the second embodiment, the different circularly polarized light may be right circularly polarized light and left circularly polarized light. Here, the first linearly polarized light and the second linearly polarized light may have phase differences of 180 degrees with each other.

In addition, according to the second embodiment, the polarization converting unit sequentially generates the first linearly polarized light and the second linearly polarized light having different phases, converts the first linearly polarized light into the right circularly polarized light, and the second The linearly polarized light may be converted into the left circularly polarized light.

13 is an exemplary view illustrating a laser display device according to a second embodiment disclosed herein.

Referring to FIG. 13, the laser display device 10 according to the second exemplary embodiment of the present disclosure may include a light combiner 100, a polarization converter 200, an image display unit 300, a controller N100, and a light detector. It may include (N200).

Since the light combining unit 100 and the image display unit 300 play a role according to the first embodiment described above, a detailed description thereof will be omitted.

The polarization converter 200 converts the liquid crystals LC and E110 and the first linearly polarized light into the right circularly polarized light sequentially generating the first linearly polarized light and the second linearly polarized light based on the linearly polarized light. A wavelength plate E120 for converting the second linearly polarized light into the left circularly polarized light may be included. Here, the photodetection wavelength plate may be a quarter wave plate.

The LC E110 generates two different linearly polarized light having a phase difference of 180 degrees while repeatedly performing turn-on / turn-off operations.

The wavelength plate E120 may be a quarter wave plate (QWP), and an angle formed by a fast axis direction of the quarter wave plate may be 45 degrees. The fast axis refers to a polarization direction with a small refractive index.

For example, the LC E110 modulates linearly polarized light incident from the light combiner 100 into two linearly polarized light having a phase difference of π. The converted two linearly polarized light may be output to the wavelength plate E120.

The wavelength plate E120 receives the first linear polarization and the second linear polarization incident from the LC E110 by positioning the angle formed by the fast axis of the wavelength plate QWP E120 to 45 degrees. The image display unit sequentially converts two different circularly polarized light (for example, right circularly polarized light and left circularly polarized light) and sequentially displaces the converted two circularly polarized light (right polarized light and left circular polarized light having a phase difference of π). And output to 300.

The photodetector N200 converts the right circularly polarized light into a third linearly polarized light, and converts the left circularly polarized light into a fourth linearly polarized light, among the detection wavelength plate N213, the third linearly polarized light, and the fourth linearly polarized light. A linear polarizer (N211) through which one linearly polarized light passes and a photo detector (PD, N212) that generates a polarization generating signal including information on the point of occurrence based on the linearly polarized light. It may include.

In addition, the light detector N200 may further include a transflective mirror N220 which transmits the right circle polarized light and the left circle polarized light to the light detector N200 by adjusting the movement paths of the right circle polarized light and the left circle polarized light. have.

For example, the right circularly polarized light and the left circularly polarized light, which are circularly polarized light incident to the light detector N200 through the transflective mirror N220, may be formed through the third linearly polarized light and the first polarized light through the detection wavelength plate N213. Four linearly polarized light is converted, and the linear polarizer N211 may pass the third linearly polarized light among the third linearly and fourth linearly polarized light.

The photo detector N212 detects the third linearly polarized light and generates a polarization generating signal (eg, an LC response signal) including information on the occurrence time based on the detected third linearly polarized light. Can be.

In this case, as in the first embodiment, the control unit N100 generates a polarization control signal based on the polarization generating signal and the image synchronization signal for the image, and based on the polarization control signal, The polarization converter 200 may be controlled such that a sequential occurrence point is located within a blank time section for the image.

Third Example

The third embodiment disclosed herein may be implemented as a part or a combination of the configurations or steps included in the above-described embodiments, or may be implemented as a combination of the embodiments, and a description of the third embodiment disclosed herein The overlapping part can be omitted.

A laser display device according to a third embodiment of the present disclosure includes a light combining unit for synthesizing a plurality of linearly polarized light having different color lights incident from a laser light source, and having different phases based on the synthesized linearly polarized light. A polarization converting unit that sequentially generates different polarizations, an image display unit displaying an image based on the different polarizations, a light detecting unit that detects information on sequential occurrence points of the different polarizations, and information on the occurrence time points The control unit may include a controller configured to control the polarization converting unit so that the sequential occurrence points of the different polarizations are located within a blank time interval for the image.

According to the third embodiment, the polarization converting unit converts the synthesized linearly polarized light into circularly polarized light, and sequentially generates first circularly polarized light and second circularly polarized light having different phases based on the converted circularly polarized light. It may be.

14 is an exemplary view illustrating a laser display device according to a third embodiment disclosed herein.

Referring to FIG. 14, the laser display device 10 according to the third exemplary embodiment of the present disclosure may include a light combiner 100, a polarization converter 200, an image display unit 300, a controller N100, and a light detector. It may include (N200).

Since the light combining unit 100 and the image display unit 300 play a role according to the first and second embodiments described above, a detailed description thereof will be omitted.

The polarization converting unit 200 is a liquid crystal that sequentially generates right circular polarization and left circular polarization having a phase difference of 180 degrees from each other based on the wavelength plate E130 for converting the synthesized linearly polarized light into circularly polarized light. LC, E140).

The polarization converting unit 200 sequentially rotates circularly polarized light generated by the wavelength plate E130 into right circularly polarized light and left circularly polarized light having phases of 180 degrees from each other by the turn-on / turn-off operation of the liquid crystal LC LC140. Can be converted to For example, when the synthesized linear polarized light by the wavelength plate E130 is converted into right polarized light, the liquid crystal LC E140 converts the right polarized light to left circular polarized light in a turn-off state, and turns The unidirectional polarized light is output as it is in -ON state. On the other hand, when the synthesized linearly polarized light by the wavelength plate E130 is converted to left circularly polarized light, the liquid crystal LC E140 converts the left circularly polarized light to right circularly polarized light in a turn-off state, and turns on The left circle polarized light is output as it is. Therefore, right-circular polarization and left-circular polarization having phases of 180 degrees are sequentially output by the turn-on / turn-off operation of the liquid crystals LC 140.

The photodetector N200 converts the right circularly polarized light into a third linearly polarized light, and converts the left circularly polarized light into a fourth linearly polarized light, among the detection wavelength plate N213, the third linearly polarized light, and the fourth linearly polarized light. A linear polarizer (N211) through which one linearly polarized light passes and a photo detector (PD, N212) that generates a polarization generating signal including information on the point of occurrence based on the linearly polarized light. It may include.

In addition, the light detector N200 may further include a transflective mirror N220 which transmits the right circle polarized light and the left circle polarized light to the light detector N200 by adjusting the movement paths of the right circle polarized light and the left circle polarized light. have.

For example, the right circularly polarized light and the left circularly polarized light, which are circularly polarized light incident to the light detector N200 through the transflective mirror N220, may be formed through the third linearly polarized light and the first polarized light through the detection wavelength plate N213. Four linearly polarized light is converted, and the linear polarizer N211 may pass the third linearly polarized light among the third linearly and fourth linearly polarized light.

The photo detector N212 detects the third linearly polarized light and generates a polarization generating signal (eg, an LC response signal) including information on the occurrence time based on the detected third linearly polarized light. Can be.

In this case, as in the first embodiment, the control unit N100 generates a polarization control signal based on the polarization generating signal and the image synchronization signal for the image, and based on the polarization control signal, The polarization converter 200 may be controlled such that a sequential occurrence point is located within a blank time section for the image.

Fourth Example

The fourth embodiment disclosed herein may be implemented as a part or a combination of the configurations or steps included in the above-described embodiments, or may be implemented as a combination of the embodiments. Hereinafter, a clear representation of the fourth embodiment disclosed herein The overlapping part can be omitted.

The laser display device according to the fourth embodiment of the present disclosure includes an optical combiner for synthesizing a plurality of linearly polarized light having different color lights incident from a laser light source, and having different phases based on the synthesized linearly polarized light. A polarization converting unit that sequentially generates different polarizations, an image display unit displaying an image based on the different polarizations, a light detecting unit that detects information on sequential occurrence points of the different polarizations, and information on the occurrence time points The control unit may include a controller configured to control the polarization converting unit so that the sequential occurrence points of the different polarizations are located within a blank time interval for the image.

According to the fourth embodiment, the light synthesizing unit comprises: a video processor generating color information corresponding to a video signal, a laser driver generating control signals for generating color lights based on the color information generated by the video processor; It may include a plurality of color light generating unit for generating a plurality of color light according to the control signals and a plurality of collimators for generating a plurality of linear polarizations corresponding to the plurality of color light.

In addition, according to the fourth embodiment, the image display unit may include a mirror that reflects the different polarizations incident from the polarization converter, and an image generator that generates the scan image based on different polarizations reflected by the mirrors. And a screen displaying the scanned image.

In addition, according to the fourth embodiment, the controller is configured to obtain an image synchronization signal for the image from the video processor, and to generate the color light based on the image synchronization signal and the information on the occurrence time, and The laser driver and the image generator may be controlled to adjust the generation point of the scan image so that the sequential generation points of the different polarizations are located within a blank time interval for the image.

15 is an exemplary view illustrating a laser display device according to a fourth embodiment disclosed herein.

Referring to FIG. 15, the laser display device 10 according to the fourth exemplary embodiment of the present disclosure includes a light combiner 100, a polarization converter 200, an image display unit 300, a controller N100, and a light detector. It may include (N200).

The light synthesizing unit 100 includes: a video processor 101 generating color information (for example, RGB (Red, Green, Blue) information) corresponding to a video signal (image); A laser driver for generating a control signal for generating color light (for example, red light, green light, blue light) based on the color information generated by the video processor 101. (Laser Driver) 102; A plurality of color light generators (for example, red light) for generating a plurality of color lights (for example, red light, green light, and blue light) according to the control signal. A generator, a green light generator, a blue light generator) (103, 104, 105); It may further comprise a plurality of collimators 106, 107, 108 generating a plurality of linear polarizations corresponding to the plurality of color lights. The light combining unit 100 may synthesize the plurality of linear polarizations and output the synthesized light to the polarization converting unit 200.

The polarization converter 200 converts the liquid crystals LC and E110 and the first linearly polarized light into the right circularly polarized light sequentially generating the first linearly polarized light and the second linearly polarized light based on the linearly polarized light. A wavelength plate E120 for converting the second linearly polarized light into the left circularly polarized light may be included. Here, the photodetection wavelength plate may be a quarter wave plate.

The LC E110 generates two different linearly polarized light having a phase difference of 180 degrees while repeatedly performing turn-on / turn-off operations.

The wavelength plate E120 may be a quarter wave plate (QWP), and an angle formed by a fast axis direction of the quarter wave plate may be 45 degrees. The fast axis refers to a polarization direction with a small refractive index.

For example, the LC E110 modulates linearly polarized light incident from the light combiner 100 into two linearly polarized light having a phase difference of π. The converted two linearly polarized light may be output to the wavelength plate E120.

The wavelength plate E120 receives the first linear polarization and the second linear polarization incident from the LC E110 by positioning the angle formed by the fast axis of the wavelength plate QWP E120 to 45 degrees. The image display unit sequentially converts two different circularly polarized light (for example, right circularly polarized light and left circularly polarized light) and sequentially displaces the converted two circularly polarized light (right polarized light and left circular polarized light having a phase difference of π). And output to 300.

The image display unit 300 may include a mirror 301 reflecting the different polarizations (for example, right circular polarization and left circular polarization) incident from the polarization converting unit, and different polarizations reflected by the mirror 301. The image generating unit 302 for generating a scan image and a screen 303 for displaying the scan image may be included.

The control unit N100 obtains an image synchronization signal for the image from the video processor 101, and adjusts the occurrence time of the color lights based on the image synchronization signal and the information on the occurrence time. The laser driver 102 and the image generator 302 may be controlled so that the sequential generation of polarization is located within a blank time interval for the image.

In addition, the controller N100 may adjust the generation time of the scan image together with the generation time of the color lights. This may be so that the screen display time point of the image is more accurately located within a blank time interval for the image.

The image synchronization signal may be at least one of a vertical synchronizing signal (Vsync), a video blank signal (Vblank), and a display enable signal (VDE).

As described above, according to the above-described embodiments, the driving timing of the polarization conversion element (or the polarization conversion unit) is adjusted to be blank time, so that a speckle pattern or flicker caused by interference of light in the laser display device is shown. It is possible to provide a laser display device and a method thereof capable of efficiently reducing the phenomenon.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

100: light combining unit 200: polarization converting unit
300: video display unit N100: control unit
N200: light detector

Claims (30)

A light combiner for synthesizing a plurality of linearly polarized light having different color lights incident from a laser light source;
A polarization converting unit sequentially generating different polarizations having different phases based on the synthesized linear polarization;
An image display unit which displays an image based on the different polarizations;
A light detector for detecting information on sequential occurrence points of the different polarizations; And
And a controller configured to control the polarization converting unit so that sequential occurrences of different polarizations are located within a blank time interval for the image based on the information on the occurrence points. The method of claim 1, wherein the blank time interval for the image,
And a time period in which any one of an even frame and an odd frame corresponding to the image is changed to another frame. The method of claim 1, wherein the light detector,
Generating a polarization generating signal including information on the time of occurrence;
The control unit,
And controlling the polarization converting unit so that the sequential generation points of the different polarizations are located within a blank time interval for the image based on the polarization generating signal. The apparatus of claim 3,
And controlling the polarization converting unit so that the sequential generation points of the different polarizations are located within a blank time interval for the image based on the polarization generation signal and the image synchronization signal for the image. The method of claim 4, wherein the video synchronization signal,
And at least one of a vertical synchronizing signal (Vsync), a video blank signal (Vblank), and a display enable signal (VDE). 5. The apparatus of claim 4,
Generating a polarization control signal based on the polarization generation signal and the image synchronization signal;
And controlling the polarization converter to sequentially generate different polarization points based on the polarization control signal within a blank time section of the image. The method of claim 1, wherein the different polarized light,
Laser display device of different linearly polarized light having a different phase. The method of claim 7, wherein the different linearly polarized light,
And a first linearly polarized light and a second linearly polarized light having a phase difference of 180 degrees from each other. The method of claim 8, wherein the polarization conversion unit,
And a liquid crystal (LC) for sequentially generating the first linearly polarized light and the second linearly polarized light based on the synthesized linearly polarized light. The method of claim 9, wherein the light detector,
A linear polarizer configured to pass linear polarization of any one of the first linearly polarized light and the second linearly polarized light; And
A photo detector (PD) for generating a polarization generating signal including information on the occurrence time based on the linear polarization,
The control unit,
Generating a polarization control signal based on the polarization generation signal and an image synchronization signal for the image;
And controlling the polarization converter to sequentially generate different polarization points based on the polarization control signal within a blank time section of the image. 12. The method of claim 10, further comprising: a transflective mirror for transmitting the first linearly polarized light and the second linearly polarized light to the light detector by adjusting the moving paths of the first linearly polarized light and the second linearly polarized light. Laser display. The method of claim 8, wherein the first linearly polarized light,
Linear polarization corresponding to the Even frame,
The second linearly polarized light,
And a linearly polarized light corresponding to an odd frame. The method of claim 1, wherein the different polarized light,
Laser display device of different circularly polarized light having a different phase. The method of claim 13, wherein the different circularly polarized light,
A laser display device of right polarization and left circular polarization. The method of claim 14, wherein the polarization conversion unit,
Sequentially generating the first linear polarization and the second linear polarization having different phases,
And converting the first linearly polarized light into the right circularly polarized light and converting the second linearly polarized light into the left circularly polarized light. The method of claim 15, wherein the first linear polarization and the second linear polarization,
Laser display device having a phase difference of 180 degrees from each other. The method of claim 15, wherein the polarization converter,
A liquid crystal (LC) for sequentially generating the first linearly polarized light and the second linearly polarized light based on the linearly polarized light; And
And a wavelength plate converting the first linearly polarized light into the right circularly polarized light and converting the second linearly polarized light into the left circularly polarized light. The method of claim 17, wherein the wavelength plate,
The laser display device being a quarter wave plate. 19. The laser display device of claim 18, wherein an angle formed by a fast axis of the quarter wave plate is 45 degrees. The method of claim 1, wherein the polarization conversion unit,
And converting the synthesized linearly polarized light into circularly polarized light and sequentially generating first and second circularly polarized light having different phases based on the converted circularly polarized light. The method of claim 20, wherein the polarization converter,
A wavelength plate for converting the synthesized linearly polarized light into circularly polarized light;
And a liquid crystal (LC) sequentially generating right circularly polarized light and left circularly polarized light having a phase difference of 180 degrees from each other based on the circularly polarized light. The light detecting unit of claim 17 or 21,
A detection wavelength plate converting the right circularly polarized light into a third linearly polarized light and converting the left circularly polarized light into a fourth linearly polarized light;
A linear polarizer configured to pass linear polarization of any one of the third linearly polarized light and the fourth linearly polarized light; And
A photo detector (PD) for generating a polarization generating signal including information on the occurrence time based on the linear polarization,
The control unit,
Generating a polarization control signal based on the polarization generation signal and an image synchronization signal for the image;
And controlling the polarization converter to sequentially generate different polarization points based on the polarization control signal within a blank time section of the image. The method of claim 22, wherein the photodetection wavelength plate,
The laser display device being a quarter wave plate. The method of claim 22,
And a transflective mirror which transmits the right polarized light and the left circular polarized light to the light detector by adjusting the movement paths of the right polarized light and the left circular polarized light. The method of claim 1, wherein the light combining unit,
A video processor generating color information corresponding to the video signal;
A laser driver for generating control signals for generating color lights based on the color information generated by the video processor;
A plurality of color light generators generating a plurality of color lights according to the control signals; And
And a plurality of collimators for generating a plurality of linear polarizations corresponding to the plurality of color lights. The display apparatus of claim 25, wherein the video display unit is
A mirror reflecting the different polarized light incident from the polarization converting part;
An image generator generating a scan image based on different polarizations reflected by the mirror; And
And a screen displaying the scanned image. 27. The apparatus of claim 26,
Obtaining an image synchronization signal for the image from the video processor,
The laser driver and the laser driver to adjust the generation time of the color lights based on the image synchronization signal and the information on the generation time so that the sequential generation points of the different polarizations are located within a blank time interval for the image; And a laser display device for controlling the image generator. The method of claim 27, wherein the control unit,
And a time point at which the color lights are generated and a time point at which the scan image is generated. The method of claim 27, wherein the video synchronization signal,
And at least one of a vertical synchronizing signal (Vsync), a video blank signal (Vblank), and a display enable signal (VDE). Synthesizing a plurality of linearly polarized light having different color lights incident from the laser light source;
Sequentially generating different polarizations having different phases based on the synthesized linear polarization;
Displaying an image based on the different polarizations;
Detecting information on sequential occurrence points of the different polarizations; And
Generating the different polarizations such that the sequential occurrence points of the different polarizations are located within a blank time interval for the image based on the information on the occurrence points. .

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