KR20130031636A - Image display apparatus using light projection - Google Patents

Image display apparatus using light projection Download PDF

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Publication number
KR20130031636A
KR20130031636A KR1020110095339A KR20110095339A KR20130031636A KR 20130031636 A KR20130031636 A KR 20130031636A KR 1020110095339 A KR1020110095339 A KR 1020110095339A KR 20110095339 A KR20110095339 A KR 20110095339A KR 20130031636 A KR20130031636 A KR 20130031636A
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KR
South Korea
Prior art keywords
light
light source
source unit
unit
color
Prior art date
Application number
KR1020110095339A
Other languages
Korean (ko)
Inventor
강신규
정준호
Original Assignee
엘지전자 주식회사
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Priority to KR1020110095339A priority Critical patent/KR20130031636A/en
Publication of KR20130031636A publication Critical patent/KR20130031636A/en

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
    • H04N5/7408—Direct viewing projectors, e.g. an image displayed on a video CRT or LCD display being projected on a screen
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
    • H04N5/7416—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal
    • H04N5/7425—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal the modulator being a dielectric deformable layer controlled by an electron beam, e.g. eidophor projector
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
    • H04N5/7416—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal
    • H04N5/7441—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal the modulator being an array of liquid crystal cells

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

PURPOSE: A light projection type of an image display device is provided to output a projection image by using a first light source unit and a second light source unit which outputs light with a method which is different from the first light source unit. CONSTITUTION: A second light source unit(420) outputs light with a method which is different from a first light source unit(410). A color separation unit(430) successively separates color by receiving the light from the first light source unit. A light synthesizing unit(440) synthesizes the light by projecting the light which is separated from the color separation unit. An integrator(450) amplifies the light collected in a third collection lens(445). A projection lens(470) projects an image to the outside. [Reference numerals] (410) First light source unit; (420) Second light source unit

Description

Image display apparatus using light projection

The present invention relates to a light projection type image display apparatus, and more particularly, to a light projection type image display apparatus capable of improving color purity.

The image display device is a device having a function of displaying an image that a user can watch. The user can watch the broadcast through the image display device. A video display device displays a broadcast selected by a user among broadcast signals transmitted from a broadcast station on a display. Currently, broadcasting is shifting from analog broadcasting to digital broadcasting worldwide.

Digital broadcasting refers to broadcasting for transmitting digital video and audio signals. Digital broadcasting is more resistant to external noise than analog broadcasting, so it has less data loss, is advantageous for error correction, has a higher resolution, and provides a clearer picture. In addition, unlike analog broadcasting, digital broadcasting is capable of bidirectional services.

SUMMARY OF THE INVENTION An object of the present invention is to provide a light projection type image display apparatus capable of improving color purity.

According to an embodiment of the present invention, there is provided a light projection type image display apparatus including a first light source unit, a second light source unit for outputting light in a different manner from the first light source unit, and receiving light from the first light source unit. A color separation unit for separating the color, a direction of the light from the second light source unit, a photosynthesis unit for transmitting the color separated light in the color separation unit to synthesize light, a micro display for outputting a predetermined image; And a projection lens that projects the generated projection image to the outside based on the synthesized light and the output image.

In addition, a light projection type image display apparatus according to an embodiment of the present invention for achieving the above object, the first light source unit, the second light source unit for outputting light in a different manner from the first light source unit, and the light from the first light source unit A color separation unit that receives and sequentially separates colors, a first photosynthesis unit that transmits light from the second light source unit, changes the direction of travel of the light from the third light source unit, and synthesizes the light; A second photosynthesis unit for transmitting and separating the light separated by the color separation unit, a micro display for outputting a predetermined image, and a light synthesized at the second photosynthesis unit and an output image. On the basis of the projection lens for projecting the generated projection image to the outside.

According to an embodiment of the present invention, in a light projection type image display apparatus, color purity may be increased by outputting a projection image by using a first light source unit and a second light source unit that outputs light in a different manner from the first light source unit. have.

In particular, when the first light source unit is used as the laser diode and the light emitting diode is used as the second light source unit, the light emitting diode can prevent the color purity from being lowered by the laser diode.

1 is a view showing the appearance of a light projection type image display apparatus according to an embodiment of the present invention.
FIG. 2 is an internal block diagram of the image display device of FIG. 1.
3 is an internal block diagram of the controller of FIG. 2.
4 is a structural diagram briefly illustrating an example of the image output unit of FIG. 2.
5 is a structural diagram schematically illustrating another example of the image output unit of FIG. 2.

Hereinafter, with reference to the drawings will be described the present invention in more detail.

The suffix "module" and " part "for components used in the following description are given merely for convenience of description, and do not give special significance or role in themselves. Accordingly, the terms "module" and "part" may be used interchangeably.

1 is a view showing the appearance of a light projection type image display apparatus according to an embodiment of the present invention.

The light projection type image display apparatus 100 according to an exemplary embodiment of the present invention may output a projection image by using a light source. In the drawing, although the projector is illustrated as the light projection type image display apparatus 100, various examples are possible.

On the other hand, the light projection type image display apparatus 100 according to an embodiment of the present invention may be provided in other electronic devices. For example, a light projection type image display device may be provided in a mobile terminal such as a mobile phone, a smart phone, a tablet, a notebook computer, a personal digital assistant (PDA), a portable multimedia player (PMP), a portable camera, or the like.

FIG. 2 is an internal block diagram of the image display device of FIG. 1.

Referring to FIG. 2, the light projection type image display apparatus 100 according to an exemplary embodiment of the present invention may include a broadcast receiving unit 105, an external device interface unit 130, a storage unit 140, and a user input interface unit 150. ), A sensor unit (not shown), a controller 170, an image output unit 180, and an audio output unit 185.

The broadcast receiver 105 may include a tuner 110, a demodulator 120, and a network interface 130. Of course, it is possible to design the network interface unit 130 not to include the tuner unit 110 and the demodulation unit 120 as necessary, and to provide the network interface unit 130 with the tuner unit 110 And the demodulation unit 120 are not included.

The tuner unit 110 selects an RF broadcast signal corresponding to a channel selected by a user or all pre-stored channels among RF (Radio Frequency) broadcast signals received through an antenna. Also, the selected RF broadcast signal is converted into an intermediate frequency signal, a baseband image, or a voice signal.

For example, if the selected RF broadcast signal is a digital broadcast signal, it is converted into a digital IF signal (DIF). If the selected RF broadcast signal is an analog broadcast signal, it is converted into an analog baseband image or voice signal (CVBS / SIF). That is, the tuner 110 may process a digital broadcast signal or an analog broadcast signal. The analog baseband video or audio signal CVBS / SIF output from the tuner 110 may be directly input to the controller 170.

In addition, the tuner unit 110 may receive a single broadcast RF broadcast signal according to an ATSC (Advanced Television System Committee) scheme or a multiple broadcast RF broadcast signal according to a digital video broadcasting (DVB) scheme.

Meanwhile, the tuner unit 110 sequentially selects RF broadcast signals of all broadcast channels stored through a channel memory function among RF broadcast signals received through an antenna in the present invention, and converts them to intermediate frequency signals or baseband video or audio signals. Can be converted to

On the other hand, the tuner unit 110 may be provided with a plurality of tuners in order to receive broadcast signals of a plurality of channels. Alternatively, a single tuner may be used to receive broadcast signals of multiple channels simultaneously.

The demodulator 120 receives the digital IF signal DIF converted by the tuner 110 and performs a demodulation operation.

The demodulation unit 120 may perform demodulation and channel decoding, and then output a stream signal TS. In this case, the stream signal may be a signal multiplexed with a video signal, an audio signal, or a data signal.

The stream signal output from the demodulator 120 may be input to the controller 170. After performing demultiplexing, image / audio signal processing, and the like, the controller 170 outputs an image to the image output unit 180 and outputs an audio to the audio output unit 185.

The external device interface unit 130 can transmit or receive data with the connected external device 190. [ To this end, the external device interface unit 130 may include an A / V input / output unit (not shown) or a wireless communication unit (not shown).

The external device interface unit 130 may be connected to an external device such as a DVD (Digital Versatile Disk), Blu-ray (Blu ray), a game device, a camera, a camcorder, a computer (laptop), a set top box, or the like by wire / wireless. It may also perform input / output operations with external devices.

The A / V input / output unit may receive a video and audio signal of an external device. The wireless communication unit may perform short range wireless communication with another electronic device.

The network interface unit 135 provides an interface for connecting the image display apparatus 100 to a wired / wireless network including an internet network. For example, the network interface unit 135 may receive content or data provided by the Internet or a content provider or a network operator through a network.

The storage 140 may store a program for processing and controlling each signal in the controller 170, or may store a signal-processed video, audio, or data signal.

In addition, the storage unit 140 may perform a function for temporarily storing an image, audio, or data signal input to the external device interface unit 130. In addition, the storage 140 may store information on a predetermined broadcast channel through a channel storage function such as a channel map.

Although the storage unit 140 of FIG. 2 is provided separately from the control unit 170, the scope of the present invention is not limited thereto. The storage 140 may be included in the controller 170.

The user input interface unit 150 transmits a signal input by the user to the control unit 170 or a signal from the control unit 170 to the user.

For example, the remote controller 200 transmits / receives a user input signal such as power on / off, channel selection, screen setting, or a local key (not shown) such as a power key, a channel key, a volume key, or a set value. Transmits a user input signal input from the control unit 170, or transmits a user input signal input from the sensor unit (not shown) for sensing the user's gesture to the control unit 170, or the signal from the control unit 170 It can transmit to a sensor unit (not shown).

The controller 170 may demultiplex the input stream or process the demultiplexed signals through the tuner unit 110, the demodulator 120, or the external device interface unit 130. Signals can be generated and output.

The image signal processed by the controller 170 may be input to the image output unit 180 and displayed as an image corresponding to the image signal. In addition, the image signal processed by the controller 170 may be input to the external output device through the external device interface unit 130.

The voice signal processed by the controller 170 may be sound output to the audio output unit 185. In addition, the voice signal processed by the controller 170 may be input to the external output device through the external device interface unit 130.

Although not shown in FIG. 2, the controller 170 may include a demultiplexer, an image processor, and the like. This will be described later with reference to FIG. 3.

In addition, the controller 170 may control overall operations of the image display apparatus 100. For example, the controller 170 may control the tuner 110 to control the tuner 110 to select an RF broadcast corresponding to a channel selected by a user or a pre-stored channel.

In addition, the controller 170 may control the image display apparatus 100 by a user command or an internal program input through the user input interface unit 150.

The controller 170 may control the image output unit 180 to display an image. In this case, the projection image output from the image output unit 180 may be a still image or a moving image, and may be a 2D image or a 3D image.

The controller 170 may generate and display a 3D object with respect to a predetermined 2D object in the projected image output from the image output unit 180. For example, the object may be at least one of a connected web screen (newspaper, magazine, etc.), an EPG (Electronic Program Guide), various menus, widgets, icons, still images, videos, and text.

Such a 3D object may be processed to have a depth different from that of the projection image output from the image output unit 180. Preferably, the 3D object may be processed to protrude compared to the projection image output from the image output unit 180.

On the other hand, although not shown in the figure, it may be further provided with a channel browsing processing unit for generating a thumbnail image corresponding to the channel signal or the external input signal. The channel browsing processor may receive a stream signal TS output from the demodulator 120 or a stream signal output from the external device interface 130, extract a video from the input stream signal, and generate a thumbnail image. Can be. The generated thumbnail image may be stream decoded together with the decoded image and input to the controller 170. The controller 170 may output a thumbnail list including a plurality of thumbnail images from the image output unit 180 by using the input thumbnail image.

In this case, the thumbnail list may be displayed in a simple viewing manner displayed in a partial region while a predetermined image is displayed on the image output unit 180 or in a full viewing manner displayed in most regions of the image output unit 180. Can be. The thumbnail images in the thumbnail list can be sequentially updated.

The image output unit 180 converts and drives an image signal, a data signal, an OSD signal, a control signal, or an image signal, data signal, control signal, etc. received from the external device interface unit 130. Generate a signal.

The image output unit 180 may be a 3D display.

The audio output unit 185 receives a signal processed by the controller 170 and outputs the audio signal.

The remote control apparatus 200 transmits the user input to the user input interface unit 150. To this end, the remote control apparatus 200 can use Bluetooth, RF (radio frequency) communication, infrared (IR) communication, UWB (Ultra Wideband), ZigBee, or the like. In addition, the remote control apparatus 200 may receive an image, an audio or a data signal output from the user input interface unit 150, and display or output the audio from the remote control apparatus 200.

Meanwhile, the above-described image display apparatus 100 may be a digital broadcast receiver capable of receiving fixed or mobile digital broadcasting.

Meanwhile, a block diagram of the image display device 100 shown in FIG. 2 is a block diagram for an embodiment of the present invention. Each component of the block diagram may be integrated, added, or omitted according to the specifications of the image display apparatus 100 that is actually implemented. That is, two or more constituent elements may be combined into one constituent element, or one constituent element may be constituted by two or more constituent elements, if necessary. In addition, the functions performed in each block are intended to illustrate the embodiments of the present invention, and the specific operations and apparatuses do not limit the scope of the present invention.

On the other hand, the image display device 100, unlike shown in Figure 2, does not include the tuner 110 and the demodulator 120 shown in Figure 2, the network interface unit 130 or the external device interface unit ( Through 135, image content may be received and played back.

3 is an internal block diagram of the controller of FIG. 2.

Referring to the drawings, the control unit 170 according to an embodiment of the present invention, the demultiplexer 310, the image processor 320, the processor 330, the OSD generator 340, the mixer 345 , Frame rate converter 350, and formatter 360. The audio processing unit (not shown) and the data processing unit (not shown) may be further included.

The demultiplexer 310 demultiplexes an input stream. For example, when an MPEG-2 TS is input, it may be demultiplexed and separated into video, audio, and data signals, respectively. The stream signal input to the demultiplexer 310 may be a stream signal output from the tuner 110 or the demodulator 120 or the external device interface 130.

The image processor 320 may perform image processing of the demultiplexed image signal. To this end, the image processing unit 320 may include a video decoder 225 and a scaler 235. [

The image decoder 225 decodes the demultiplexed image signal, and the scaler 235 performs scaling so that the resolution of the decoded image signal can be output from the image output unit 180.

The video decoder 225 may include a decoder of various standards.

The processor 330 may control overall operations in the image display apparatus 100 or the controller 170. For example, the processor 330 may control the tuner 110 to control tuning of an RF broadcast corresponding to a channel selected by a user or a previously stored channel.

In addition, the processor 330 may control the image display apparatus 100 by a user command or an internal program input through the user input interface unit 150.

In addition, the processor 330 may perform data transmission control with the network interface unit 135 or the external device interface unit 130.

The processor 330 may control operations of the demultiplexing unit 310, the image processing unit 320, the OSD generating unit 340, and the like in the controller 170.

The OSD generator 340 generates an OSD signal according to a user input or itself. For example, based on a user input signal, a signal for displaying various types of information on a screen of the projected image output from the image output unit 180 as a graphic or text may be generated. The generated OSD signal may include various data such as a user interface screen, various menu screens, widgets, and icons of the image display apparatus 100. In addition, the generated OSD signal may include a 2D object or a 3D object.

In addition, the OSD generator 340 may generate a pointer that is output and displayed on the image output unit 180 based on a pointing signal input from the remote controller 200. In particular, such a pointer may be generated by the pointing signal processor, and the OSD generator 240 may include such a pointing signal processor (not shown). Of course, the pointing signal processor (not shown) may be provided separately without being provided in the OSD generator 240.

The mixer 345 may mix the OSD signal generated by the OSD generator 340 and the decoded image signal processed by the image processor 320. The mixed video signal is provided to the frame rate converter 350.

A frame rate converter (FRC) 350 can convert the frame rate of an input image. On the other hand, the frame rate converter 350 can output the data as it is without additional frame rate conversion.

The formatter 360 receives a mixed signal, that is, an OSD signal and a decoded video signal, from the mixer 345 and changes the format of the signal to be suitable for the video output unit 180. For example, the R, G, B data signals may be output, and the R, G, B data signals may be output as low voltage differential signaling (LVDS) or mini-LVDS.

Meanwhile, the formatter 360 may separate the 2D video signal and the 3D video signal for displaying the 3D video. In addition, the format of the 3D video signal may be changed or the 2D video signal may be converted into a 3D video signal.

Meanwhile, the audio processing unit (not shown) in the control unit 170 can perform the audio processing of the demultiplexed audio signal. To this end, the audio processing unit (not shown) may include various decoders.

Also, the audio processor (not shown) in the controller 170 may process a base, a treble, a volume control, and the like.

The data processor (not shown) in the controller 170 may perform data processing of the demultiplexed data signal. For example, when the demultiplexed data signal is an encoded data signal, it may be decoded. The encoded data signal may be EPG (Electronic Progtam Guide) information including broadcast information such as a start time and an end time of a broadcast program broadcasted in each channel.

In FIG. 3, the signals from the OSD generator 340 and the image processor 320 are mixed in the mixer 345 and then 3D processed in the formatter 360, but the present invention is not limited thereto. May be located after the formatter. That is, the output of the image processor 320 is 3D processed by the formatter 360, and the OSD generator 340 performs 3D processing together with OSD generation, and then mixes each processed 3D signal by the mixer 345. It is also possible.

Meanwhile, a block diagram of the controller 170 shown in FIG. 3 is a block diagram for one embodiment of the present invention. Each component of the block diagram may be integrated, added, or omitted according to the specification of the controller 170 that is actually implemented.

In particular, the frame rate converter 350 and the formatter 360 are not provided in the controller 170, but may be provided separately.

4 is a structural diagram briefly illustrating an example of the image output unit of FIG. 2.

Referring to the drawings, the image output unit 180 of the light projection image display apparatus 100 may include a first light source 410, a second light source 420, a color separator 430, and a first condenser lens 435. The second condenser lens 425, the third condenser lens 445, the photosynthesis unit 440, the mirror unit 455, the micro display 460, and the projection lens 470 may be included.

According to the exemplary embodiment of the present invention, the image output unit 180 of the light projection type image display apparatus 100 uses a plurality of light source units of different types. Accordingly, the light projection type image display apparatus 100 according to the embodiment of the present invention may be referred to as a light projection type image display apparatus using a hybrid light source.

In the drawing, a blue laser diode is used as the first light source 410 and a red light emitting diode is used as the second light source 420.

When the blue light, the red light, and the green light are separated and output using a laser diode, the color purity of the red light may be degraded. Thus, in an embodiment of the present invention, in order to improve the color purity, it is suggested to use the red light as a separate light source. do. That is, the use of the red LED as the second light source unit 420 is presented.

On the other hand, the color separation unit 430 receives the light output from the first light source unit 410 to sequentially separate the color. For this purpose, a wheel (phosophor wheel) in which a plurality of color fluorescent layers is formed may be used. As the wheel rotates, the light output from the first light source unit 410 is sequentially irradiated onto each color fluorescent layer, and accordingly, colors may be sequentially separated according to the color of the color fluorescent layer.

In the drawing, the color separation unit 430 is illustrated with a green phosphor layer and a yellow phosphor layer. Accordingly, in the color separator 430, green light and yellow light may be separated and output.

On the other hand, in order to output the blue light, the color separation unit 430 may further include a color diffusion layer to emit light of the same color as the blue light. In the drawing, the color separation unit 430 includes a blue diffuser.

On the other hand, it is preferable that the area of the green phosphor layer is larger than the area of the yellow phosphor layer among the color fluorescent layers formed in the color separation unit 430. As a result, it is possible to increase the luminance of the white light outputted by the photosynthesis unit in the future.

In the drawing, the area of the green phosphor is 50%, the area of the yellow phosphor is 25%, and the area of the blue diffuser is 25% in the color separator 430. To illustrate.

On the other hand, the light of the color separated and output by the color separator 430 is collected by the first condenser lens 435 (collimator), and is transmitted to the photosynthesis unit 440 (dicroic mirror).

In addition, the light output from the second light source unit 420 is collected by the second condenser lens 425 (collimator) and transmitted to the photosynthesis unit 440 (dicroic mirror).

The photosynthesis unit 440 changes the traveling direction of the light from the second light source unit 420, transmits the color separated by the color separation unit 430, and synthesizes and outputs the light.

That is, as shown in the drawing, the photosynthesis unit 440 reflects the red light from the second light source unit 420 so that the red light is output in the direction of the third condensing lens 445, and the color separated by the separation unit 430. Blue light, green light, and yellow light are transmitted to be output in the direction of the third condenser lens 445 (collimator). That is, the photosynthesis unit 440 selectively reflects the wavelength of the specific light and transmits the wavelength of the other wavelength.

Accordingly, the photosynthesis unit 440 may output the white light obtained by combining the red light, the blue light, the green light, and the yellow light in the direction of the third condenser lens 445 (collimator).

The third condenser lens 445 may collect light synthesized by the photosynthesis unit 440, for example, white light.

The integrator 450 amplifies the light collected by the third condenser lens 445. The amplified light is provided to the mirror unit 455, and the mirror unit 455 changes the traveling direction of the light, that is, reflects it, so that the amplified light is incident on the micro display 460.

The micro display 460 may be a display that outputs an image output from the above-described control unit 170 in a small size. This micro display 460 may be a liquid crystal display (LCD) or may be a digital micromirror device (DMD). In the figure, a digital micromirror device (DMD) is illustrated, in which light is reflected at the micro display 460.

Based on the light incident on the micro display 460 and the output image, the generated projection image is transferred to the projection lens 470, and the projection lens 470 projects the projection image. Project to the outside.

On the other hand, unlike the drawing, when the liquid crystal display is used as the micro display 460, light incident on the micro display 460 may be transmitted, and the position of the projection lens may be opposite to the drawing.

Meanwhile, although the blue laser diode is illustrated as the first light source unit 410 in FIG. 4, a white laser diode may be used. At this time, unlike the drawing, the color separator 430 may include only the color fluorescent layer without the color diffusion layer. That is, instead of the blue diffusion layer, a blue fluorescent layer may be disposed.

In the light projection type image display apparatus according to an embodiment of the present invention, color purity may be increased by outputting a projection image by using a first light source unit and a second light source unit that outputs light in a different manner from the first light source unit. .

In particular, in the embodiment of the present invention, when the first light source unit is used as the laser diode and the light emitting diode is used as the second light source unit, due to the light emitting diode, it is possible to prevent color purity degradation due to the laser diode.

On the other hand, by using a laser diode as a light source can be used semi-permanently, it is possible to slim down the thickness of the light projection image display device.

5 is a structural diagram schematically illustrating another example of the image output unit of FIG. 2.

The image output unit 180 of FIG. 5 differs from the image output unit 180 of FIG. 4 in that two LED light sources are used. Accordingly, the arrangement of the color fluorescent layer of the color separator is also different.

Referring to the drawings, the image output unit 180 of the light projection image display apparatus 100 may include a first light source unit 510, a second light source unit 520, a third light source unit 522, a color separation unit 530, The first condenser lens 535, the second condenser lens 525, the third condenser lens 526, the fourth condenser lens 545, the first photosynthetic part 527, the second photosynthetic part 540, and the mirror part 555, a micro display 560, and a projection lens 570.

In the drawing, a blue laser diode is used as the first light source 510, a blue light emitting diode is used as the second light source 520, and a third light source 522 is used. Illustrates the use of a red light emitting diode.

When the blue light, the red light, and the green light are separated and output using a laser diode, the color purity of the red light may be degraded. Thus, in an embodiment of the present invention, in order to improve the color purity, it is suggested to use the red light as a separate light source. do. That is, the use of the red LED as the third light source 522 is suggested.

On the other hand, the color separation unit 530 receives the light output from the first light source unit 510 and sequentially separates the colors. For this purpose, a wheel (phosophor wheel) in which a plurality of color fluorescent layers is formed may be used. As the wheel rotates, the light output from the first light source unit 510 is sequentially irradiated to each color fluorescent layer, and accordingly, colors may be sequentially separated according to the color of the color fluorescent layer.

In the drawing, the color separation unit 530 includes a green phosphor layer and a yellow phosphor layer. Accordingly, in the color separator 530, green light and yellow light may be separated and output.

Meanwhile, the area of the green phosphor layer among the color fluorescent layers formed in the color separator 530 may be the same as the area of the yellow phosphor layer.

In the drawing, it is illustrated that the area of the green phosphor layer is 50% and the area of the yellow phosphor layer is 50% in the color separation unit 530.

On the other hand, the light of the color separated and output from the color separator 530 is collected by the first condenser lens 535 (collimator), and transmitted to the second photosynthesis unit 540 (dicroic mirror).

Meanwhile, the light output from the second light source unit 520 is collected by the second condenser lens 525 and transmitted to the first photosynthetic unit 527 (dicroic mirror).

On the other hand, the light output from the third light source unit 520 is collected by the third condenser lens 526 (collimator), and is transmitted to the first photosynthetic unit 527 (dicroic mirror).

The first photosynthetic unit 527 (dicroic mirror) changes the traveling direction of the light from the second light source unit 520, transmits the color separated by the color separation unit 530, and synthesizes and outputs the light.

That is, as shown in the drawing, the first photosynthesis unit 527 transmits blue light from the second light source unit 520 so that the blue light is output in the direction of the second photosynthesis unit 540 and from the third light source unit 522. The red light is reflected so that the red light is output toward the second photosynthesis unit 540. In other words, the first photosynthetic unit 527 selectively reflects the wavelength of the specific light and transmits the other wavelength.

The second photosynthesis unit 540 changes the traveling direction of the light synthesized by the first photosynthesis unit 527, transmits the color separated light by the color separation unit 530, and synthesizes and outputs the light. do.

That is, as shown in the drawing, the second photosynthesis unit 540 reflects the light synthesized by the first photosynthesis unit 527 and outputs the light toward the fourth condensing lens 545. The separated green light and yellow light are transmitted to be output in the direction of the fourth condenser lens 545 (collimator). That is, the second photosynthesis unit 540 selectively reflects the wavelength of the specific light, and transmits the other wavelength.

Accordingly, the second photosynthesis unit 540 may output the white light obtained by combining the red light, the blue light, the green light, and the yellow light in the direction of the fourth condenser lens 545 (collimator).

The fourth condenser lens 545 may collect light synthesized by the second photosynthesis unit 540, for example, white light.

The integrator 550 amplifies the light collected by the fourth condenser lens 545. The amplified light is provided to the mirror portion 555, and the mirror portion 555 controls the amplified light to be incident on the micro display 560 by changing the traveling direction of the light, that is, reflecting it.

The micro display 560 may be a display that outputs an image output from the above-described control unit 170 in a small size. Such a micro display 560 may be a liquid crystal display (LCD) or may be a digital micromirror device (DMD). In the figure, a digital micromirror device (DMD) is illustrated in which light is reflected at the micro display 560.

Based on the light incident on the micro display 560 and the output image, the generated projection image is transferred to the projection lens 570, and the projection lens 570 projects the projection image. Project to the outside.

Meanwhile, although the blue laser diode is illustrated as the first light source unit 410 in FIG. 5, the white laser diode may be used. At this time, the color separation unit 530, as shown in the green phosphor layer and the yellow fluorescent layer may be disposed as it is.

In the light projection type image display apparatus according to the embodiment of the present invention, color purity is obtained by outputting a projection image by using a first light source unit, a second light source unit that outputs light in a different manner from the first light source unit, and a third light source unit. Can be increased.

In particular, when using the first light source unit as the laser diode and the light emitting diode as the second light source unit and the third light source unit, as in the embodiment of the present invention, due to the light emitting diode, it is possible to prevent color purity degradation due to the laser diode. It becomes possible.

On the other hand, by using a laser diode as a light source can be used semi-permanently, it is possible to slim down the thickness of the light projection image display device.

The optical projection type image display apparatus according to the present invention is not limited to the configuration and method of the embodiments described as described above, but the embodiments are all or part of each of the embodiments is selectively selected so that various modifications can be made. It may be configured in combination.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, 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 present invention.

Claims (14)

A first light source unit;
A second light source unit configured to output light in a manner different from that of the first light source unit;
A color separation unit that receives light from the first light source unit and sequentially separates colors;
A photosynthesis unit which changes the traveling direction of the light from the second light source unit and transmits the light separated in the color separation unit to synthesize light;
A micro display for outputting a predetermined image; And
And a projection lens for projecting the generated projection image to the outside based on the synthesized light and the output image. The method of claim 1,
And the light separated from the color in the color separation unit and the light from the second light source unit are different from each other. The method of claim 1,
The color separator,
And a plurality of color fluorescent layers emitting light of a different color from the light from the first light source unit. The method of claim 3,
An optical projection type image display apparatus, wherein the areas of the first color fluorescent layer and the second color fluorescent layer are different from each other. The method of claim 3,
The color separator,
And a color diffusion layer that emits light having the same color as the light from the first light source unit. The method of claim 1,
And a condenser lens for condensing the light synthesized by the photosynthesis unit. The method of claim 1,
The light separated in the color separation unit includes blue light and green light,
And the light from the second light source unit comprises red light. The method of claim 7, wherein
The light separated by the color separating unit may further include yellow light. The method of claim 1,
The first light source unit includes a laser diode, and the second light source unit includes a light emitting diode. A first light source unit;
A second light source unit configured to output light in a manner different from that of the first light source unit;
A third light source unit configured to output light in a manner different from that of the first light source unit;
A color separation unit that receives light from the first light source unit and sequentially separates colors;
A first photosynthesis section that transmits the light from the second light source section and changes the traveling direction of the light from the third light source section to synthesize light;
A second photosynthesis unit configured to change a traveling direction of the light synthesized by the first photosynthesis unit and to transmit light separated by the color separation unit to synthesize light;
A micro display for outputting a predetermined image; And
And a projection lens configured to project the generated projection image to the outside based on the light synthesized by the second photosynthesis unit and the output image. The method of claim 10,
And the light separated from the color separation unit, the light from the second light source unit, and the light from the third light source unit are different from each other. The method of claim 10,
The color separator,
And a plurality of color fluorescent layers emitting light of a different color from the light from the first light source unit. The method of claim 10,
The light separated in color from the color separator includes green light and yellow light,
The light from the second light source unit includes blue light,
And the light from the third light source unit comprises red light. The method of claim 10,
The first light source unit includes a laser diode, the second light source unit includes a light emitting diode, and the third light source unit includes a light emitting diode. Device.
KR1020110095339A 2011-09-21 2011-09-21 Image display apparatus using light projection KR20130031636A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022054975A1 (en) * 2020-09-08 2022-03-17 엘지전자 주식회사 Optical system comprising hybrid light source, and projector device comprising same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022054975A1 (en) * 2020-09-08 2022-03-17 엘지전자 주식회사 Optical system comprising hybrid light source, and projector device comprising same

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