KR20030086132A - A display apparatus - Google Patents

Abstract

PURPOSE: A display device is provided to display images without regard to place by controlling a projection angle of the light irradiated on a screen through interlocking a portable display. CONSTITUTION: A display device includes a color density controller(200), the first to the third light sources(410-430), the first and the second beam irradiators(510,520), a refractive grating(700), and a refraction angle controller(600). The color density controller(200) extracts the intensity of RGB colors of each pixel from source image data and outputs electric signals thereof. The first to the third light sources(410-430) generate the brightness-changed light according to the output of the color density controller(200). The first and the second beam irradiators(510,520) irradiate the RGB beams of the first to the third light sources(410-430) to the refractive grating(700). The refractive grating(700) is used for refracting and projecting the light of the first and the second beam irradiators(510,520) to the screen. The refractive index control portion(600) controls a refractive index of the light by applying an electrical signal to a liquid crystal of the refractive grating(700).

Description

Display device {A DISPLAY APPARATUS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly, to a display device for realizing an image using a laser beam and carrying the same.

In general, various display apparatuses are used to display an image.

For example, there may be a monitor, projector, or the like.

Such display apparatuses receive a source image (for example, an image stored in a computer disk, an image received using wired or wireless communication, an image captured by a camera, etc.) from the outside, and display the image on the screen.

However, such image display devices are subject to limitations of place and portability.

For example, a monitor is difficult to carry because its volume is large, and when displaying images to a large number of people, a large image cannot be displayed because the size of the displayed image is limited to the size of the monitor.

And. In the case of a projector, a large screen can be displayed, but the price is very expensive and the use place is restricted.

In addition, other display devices other than this also have problems of portability and location limitation.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and adjusts the angle at which light (particularly a laser beam) is irradiated to a screen to implement an image, and also to carry it, thereby interlocking with a portable image display device, thereby making it a place. It is an object of the present invention to provide a display device capable of displaying an image without receiving.

1 is a block diagram showing a display device using a laser of the present invention.

Figure 2 shows the structure of a beam refraction grating applied in the present invention.

3 and 4 illustrate examples of a state in which a refractive angle is changed by adjusting a voltage applied to the electrode of FIG. 2.

5 shows an example for two-dimensional refracting a beam using two refractive gratings.

6 illustrates a state in which an image is realized by reflecting a laser beam by a beam refraction grating;

7 illustrates a state in which an image is realized by transmitting a laser beam by a beam refraction grating;

8 shows the structure of a refractive grating for explaining a state of transmitting a laser beam;

9 is a view showing another embodiment of the beam irradiator;

10 is a view showing a state of use of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: interface unit 200: color intensity control unit

300: amplification unit 400: laser source

500: beam irradiation unit 600: refractive angle control unit

700: refraction grating 800: lens

900: screen

Display device according to the present invention for achieving the above object,

A color intensity controller which extracts the RGB color intensity of each pixel from the source image data and outputs an electrical signal accordingly;

A laser source sequentially generating an RGB laser beam whose brightness is changed according to the output of the color intensity controller;

A beam irradiator which irradiates an RGB laser beam sequentially generated from the laser source to an arbitrary position of a refractive grating;

A refractive grating for refracting the laser beam from the beam irradiator at various angles and projecting the light on the screen according to an electrical signal applied by the liquid crystal;

And a refraction angle controller configured to determine the positional information of each pixel from the source image data and to control the refraction angle of the laser beam by applying an electrical signal to the liquid crystal of the refraction grating.

The display device by the liquid crystal of the present invention configured as described above will be described in detail with reference to the drawings.

1 is a block diagram of a display apparatus using a laser of the present invention, and the interface unit 100 provides source image data applied from the outside to the color intensity controller 200 and the refraction angle controller 600.

The source image data may be various external input source image data such as an image provided from an image output terminal of a desktop or notebook computer, an image displayed on a PDA terminal, and the like.

The color intensity controller 200 extracts the RGB color intensity of each pixel from the source image data, and generates an electrical signal value corresponding to the RGB color intensity.

That is, the signal of the RGB color frame is separated from the source image data, and then an electric signal value of a magnitude corresponding to the intensity of each color is generated in accordance with a video refreshing signal set at 30 Hz per frame. do.

As a result, the color intensity control unit 200 sequentially generates and outputs an electrical signal value corresponding to the RGB color intensity of each pixel on a screen of one frame. For example, the color intensity controller 200 corresponds to the color intensity of R of one pixel. A signal value is generated first, and then an electrical signal value for the color intensity of G is generated, and a signal value for the color intensity of B is then generated.

The RGB color intensity values of one pixel output from the color intensity controller 200 are applied by the respective amplifiers 310, 320, and 330 to be amplified into signal values of a size that can be driven by the laser sources 410, 420, and 430.

In this case, the color intensity controller 200 applies a signal value of R to the first amplifier 310, applies a signal value of G to the second amplifier 320, and applies a signal value of B to the third amplifier 330. To be applied.

The color intensity signal value of R amplified by the first amplifier 310 is applied to the first laser source 410 to generate a laser beam of R whose brightness is adjusted.

The laser beam of R generated from the first laser source 410 is irradiated to any position of the refraction grating 700 through the beam irradiator 510, 520.

In this case, the beam irradiator 510, 520 uses a dichronic filter having a 45 degree reflection angle, and the laser beam of R generated from the rear surface of the beam irradiator 510, 520 passes through the refraction grating 700. Is investigated.

The color intensity signal value of G amplified by the second amplifier 320 is applied to the second laser source 420 to generate a laser beam of G whose brightness is controlled.

The laser beam of G generated from the second laser source 420 is reflected at a 45 degree angle by the first beam irradiator 510, and passes through the second beam irradiator 520 to irradiate the refractive grating 700. do.

At this time, the irradiated position is the same as the irradiated laser beam of R.

The color intensity signal value of B amplified by the third amplifier 330 is applied to the third laser source 430 to generate a laser beam of B whose brightness is adjusted.

The laser beam of G generated from the third laser source 430 is reflected at a 45 degree angle by the second beam irradiator 520 and is immediately irradiated onto the refraction grating 700.

At this time, the irradiated position is the same as the irradiated laser beam of R and G.

As a result, the laser beam corresponding to the RGB of one pixel is sequentially irradiated at the same position of the refraction grating.

The refraction grating reflects the RGB laser beam incident at an arbitrary position through the beam irradiators 510 and 520 at the same angle and irradiates it onto the screen 900 to synthesize each laser beam of RGB by the afterimage effect. The color of one pixel is realized.

The light source for forming such a screen may use not only a laser beam using a laser diode, but also an optical unit including an LED and a condensing lens, and various light sources.

FIG. 2 illustrates a structure of a beam refraction grating using a nematic liquid crystal, and the liquid crystal in various states such as not only the liquid crystal in the nematic state but the liquid crystal in the ferroelectric state may be used.

The structure of the beam refraction grating is provided with a reflector 710 in the form of a plate on the bottom layer, a plurality of electrodes 720 in the form of a grid on the upper layer, the transparent reverse electrode layer 740 with a space thereon. A counter-electrode is provided, and a liquid crystal 730 is provided between the reflector 710 and the reverse electrode layer 740.

The reflector 710 is in the form of a plate made of silicon, and such a refractive grating can be miniaturized and mass produced by a thin film manufacturing technology.

Such a refraction grating is also called a spatial light modulator (SLM) and is mainly used for communication optical switches.

The incident beam B incident from the laser sources 410, 420, 430 is transmitted through the reverse electrode layer 740, and is reflected at different angles of refraction according to the arrangement state of the liquid crystal 730, and the reflected beam B ') Is irradiated to the screen 900.

In this case, adjustment of the arrangement state of the liquid crystal 730 may be performed by controlling an index profile by adjusting a voltage applied to the electrode 720.

The electrodes 720 are uniformly arranged in a grid form in the X and Y-axis directions to achieve two-dimensional reflection.

That is, in order to irradiate an image on the screen, since the laser beams in the X-axis and Y-axis directions must be reflected, the electrode 720 should have a two-dimensional grid arrangement.

An example of controlling the index profile will be described with reference to FIGS. 3 and 4.

3 is a diagram illustrating a case in which an index profile is controlled to have a large reflection angle. In order to adjust the width of a phase ramp, the voltage pulses are sequentially reduced within a relatively narrow phase ramp section so that the corresponding electrode ( By applying 720, the liquid crystal is arranged to have a large reflection angle.

In this case, the first voltage pulse is applied to the first electrode, that is, the leftmost electrode, and the next voltage pulse is applied to the second electrode, so that each voltage pulse is sequentially applied to the corresponding electrode, respectively. will be.

FIG. 4 is a diagram illustrating a case in which an index profile is controlled to have a small reflection angle. In order to adjust the width of a phase ramp, voltage pulses are sequentially reduced within a relatively wide phase ramp section, so that the corresponding electrode ( By applying 720, the liquid crystal is arranged to have a small reflection angle.

When the index profile is controlled for the X and Y axes, two-dimensional laser beam projection is possible.

On the other hand, as opposed to the case where the grid of the X-axis and the Y-axis is formed on one refractive grating, the reflection of the laser beam on the X-axis and the Y-axis can be realized by using two two-dimensional refraction gratings.

This is illustrated in FIG. 5.

In this case, the reflector of the refraction grating of A is fabricated in a transmissive manner using a transparent substrate (for example, glass or sapphire) coated with ITO (Indium Tin Oxide) instead of silicon.

If the grid of the refraction grating A is arranged in the horizontal direction and the grid of the refraction grating B is arranged in the vertical direction beneath it, the refraction of the refraction grating A is in the X axis direction when the incident beam B is incident in the X axis direction It is caused to transmit downward, the refracted incident beam (B) is a two-dimensional reflection in the Y-axis direction in the refraction grating B.

The two-dimensionally reflected reflection beam B 'is once again refracted in the X-axis direction in the refraction grating A.

Therefore, the incident beam B incident in the X-axis direction is reflected at a distance in the Y-axis direction by 'D'.

Accordingly, the display of the image is possible by controlling the reflection angles of the X and Y axes.

On the other hand, the refraction angle control unit 600 generates a pulse voltage for controlling the index profile as shown in FIGS. 3 and 4 to provide to the refractive grating 700.

The refraction angle controller 600 should generate an index profile for each direction when the directions of the grids of the refraction grating 700 are perpendicular to each other.

To this end, the refraction angle controller 600 determines position information of each pixel from the source image provided from the interface unit 100, and adjusts the reflection angles of the X and Y axes of the refraction grating 700 according to the position information of the pixel. The control allows laser beams incident from the laser sources 410, 420, 430 to the refractive grating 700 to be irradiated to the corresponding positions of the screen 900.

The determination of the position of each pixel can be determined by the refreshing signal of the above-mentioned image, which is already known and will not be described in detail.

Meanwhile, the size of the image irradiated onto the screen 900 may be adjusted according to the control of the refractive angle controller 600.

That is, the refraction angle control unit 600 may control the size of the image by controlling the angle in which the laser beam is refracted and reflected only within a certain angle range in controlling the index profile.

In addition, the lens 800 may be provided on the front surface of the refraction grating 700 to further widen the angle of refraction of the reflected beam.

In general, since the refraction angle of the laser beam incident and reflected by the refraction grating 700 is not so large, the lens 800 may be provided with a lens 800 to widen the irradiation range of the laser beam when a large image is to be realized.

FIG. 6 is a view illustrating a state in which an image S is implemented by reflecting a laser beam generated from the laser source 400 by the beam refraction grating 700. In the X and Y axis directions by the refraction grating 700, FIG. The color image is implemented by the RGB laser beam refracted and reflected.

FIG. 7 illustrates a state in which an image is implemented while the laser beam generated by the laser source 400 passes through the refraction grating 700.

As shown in FIG. 8, the refraction grating 700 is refracted while transmitting the laser beam B incident from the laser source 400 so that the refracted beam B 'is irradiated onto the screen 900 as an image. will be.

In this case, the refractive grating 700 does not have a separate reflector.

The refractive grating 700 is the same as that shown in FIG. 2, but is manufactured in a transmissive type using a transparent substrate coated with indium tin oxide (ITO) as described in an embodiment of the present invention instead of a reflector made of silicon. .

Therefore, the incident laser beam B is directly irradiated to the pattern of the screen 900 with the laser beam B 'having a refracted angle while transmitting.

The index profile for the arrangement of the liquid crystal 730 'and the voltage pulse of the refraction angle controller 600 applied to the electrode 720' have already been described in detail in the present invention and will not be described again.

9 illustrates another embodiment of the beam irradiator 510 and 520 of FIG. 1. As illustrated in FIG. 8, the beam irradiator 510 and 520 is implemented by a refraction grating of a laser beam projection type.

That is, the angles of the laser sources 410, 420, 430 are fixed so that the laser beams B1, B2, B3 are irradiated at any one position of the diffraction grating, and then each laser beam B1, B2, B3 is respectively used as its refraction grating. The laser beam B 'emitted by controlling the index profile when being incident and changing its transmitted transmission angle is always irradiated at any position of the refractive grating 700 in a single direction.

For this reason, as shown in FIG. 1, the beam irradiator may be implemented by one refraction grating without using a plurality of beam irradiators 500 formed of the reflector.

On the other hand, in the above described the state of implementing a color image using an RGB laser beam, it will be possible to implement a mono image using a laser beam having a single color.

When implementing such a mono image,

A color intensity controller which extracts color intensity of each pixel from the source image data and outputs an electrical signal accordingly;

A laser source generating a laser beam whose brightness is changed according to an output of the color intensity controller;

A refraction grating for refracting the laser beam at various angles and projecting the light on a screen according to an electrical signal applied to the liquid crystal;

And a refraction angle controller configured to determine the positional information of each pixel from the source image data and to control the refraction angle of the laser beam by applying an electrical signal to the liquid crystal of the refraction grating.

In this case, it is much simpler to implement a color image.

That is, only one laser source is needed, and the beam irradiation part is not necessarily needed.

The laser beam having only one color generated from the laser source only needs to be irradiated at any one position of the refractive grating.

In addition, by controlling the color intensity, it is possible to realize tones of various levels but mono, and thus an image having a similar gray level may be realized.

Other technical matters are the same as described above.

FIG. 10 is a view illustrating a state in which a display apparatus using a laser of the present invention is applied to a portable imaging device, and in FIG.

That is, it shows the state of implementing a color or mono screen by irradiating a laser beam to the screen 900 using the display device of the present invention the image displayed on the screen of the PDA 10 carried by the user.

Of course, not only PDA, but also can be applied to various portable video devices such as laptops or fixed video devices, as well as internal or external can be implemented.

As described above, the present invention has the following effects.

First, a low cost display device is realized using a light source, especially a laser.

Second, since the component to be configured is simple and small, it is possible to implement a compact display device, which is easy to carry.

Third, low-cost display devices can be realized because of using relatively inexpensive components.

Fourth, power consumption is minimized because it can be driven under low current conditions.

Claims (9)

A color intensity controller which extracts the RGB color intensity of each pixel from the source image data and outputs an electrical signal accordingly; A light source sequentially generating light whose brightness is changed according to an output of the color intensity controller; A beam irradiator which irradiates RGB light sequentially generated from the light source to an arbitrary position of the refraction grating; A refraction grating for refracting light from the beam irradiator at various angles and projecting the light from the beam irradiator at various angles according to an electrical signal applied to the liquid crystal; And a refraction angle controller configured to determine the positional information of each pixel from the source image data and to control an angle of refraction of light by applying an electrical signal to the liquid crystal of the refraction grating. The display apparatus of claim 1, wherein the beam irradiator is one of a dichronic filter or a refraction grating. The system of claim 1 wherein the refractive grating is Either a transparent plate-like transmissive layer or a reflector for insulation is provided on the bottom layer, and a plurality of electrodes are provided on the upper layer in a grid form, and a transparent counter-electrode is provided with a space thereon. In addition, the display device, characterized in that the liquid crystal is provided between the transmission layer or the reflector and the reverse electrode layer. The display apparatus of claim 1, wherein the refraction grating includes a liquid crystal grid in a vertical direction and a horizontal direction. The display apparatus of claim 1, wherein the display device comprises a lens on a front surface of the refractive grating. A color intensity controller which extracts color intensity of each pixel from the source image data and outputs an electrical signal accordingly; A light source generating light having a changed brightness according to an output of the color intensity controller; A refractive grating for refracting the light at various angles and projecting the light onto a screen according to an electrical signal applied to the liquid crystal; And a refraction angle controller configured to determine the position information of each pixel from the source image data and to control an angle of refraction of light by applying an electrical signal to the liquid crystal of the refraction grating. 7. The refractive grating of claim 6 wherein Either a transparent plate-like transmissive layer or a reflector for insulation is provided on the bottom layer, and a plurality of electrodes are provided on the upper layer in a grid form, and a transparent counter-electrode is provided with a space thereon. In addition, the display device, characterized in that the liquid crystal is provided between the transmission layer or the reflector and the reverse electrode layer. The display apparatus of claim 6, wherein the refraction grating includes a liquid crystal grid in a vertical direction and a horizontal direction. The display apparatus according to claim 6, wherein the display device comprises a lens on the front surface of the refractive grating.