KR20190069064A - Laser projector - Google Patents

Laser projector Download PDF

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Publication number
KR20190069064A
KR20190069064A KR1020170169432A KR20170169432A KR20190069064A KR 20190069064 A KR20190069064 A KR 20190069064A KR 1020170169432 A KR1020170169432 A KR 1020170169432A KR 20170169432 A KR20170169432 A KR 20170169432A KR 20190069064 A KR20190069064 A KR 20190069064A
Authority
KR
South Korea
Prior art keywords
light
blue light
blue
phosphor
laser projector
Prior art date
Application number
KR1020170169432A
Other languages
Korean (ko)
Inventor
강신규
복기소
Original Assignee
엘지전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to KR1020170169432A priority Critical patent/KR20190069064A/en
Publication of KR20190069064A publication Critical patent/KR20190069064A/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H04N9/3111—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources
    • H04N9/3117—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources by using a sequential colour filter producing two or more colours simultaneously, e.g. by creating scrolling colour bands
    • 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
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • 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
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2066—Reflectors in illumination beam
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3161—Modulator illumination systems using laser light sources

Abstract

According to an embodiment of the present invention, a laser projector comprises: a blue laser diode for outputting blue light; a split mirror for transmitting a part of the output blue light and reflecting the remaining blue light; a phosphor for generating red light and green light by using the part of blue light transmitted from the split mirror; an interference mirror for reflecting the red light and the green light generated by the phosphor; and a color wheel for outputting any one among the remaining blue light, the red right, and the green light.

Description

LASER PROJECTOR

The present invention relates to a laser projector, and more particularly, to a laser projector using a split mirror.

Generally, the optical system of a projector uses a lamp as a light source, projects it onto a microdisplay panel by applying a light tunnel optical system, and implements an image through a screen.

An optical system using a lamp as a light source can produce high brightness, but it has a disadvantage that the lamp needs to be replaced after a certain period of time during the use because the lamp has a long turn-on time and a short life.

To overcome these disadvantages, there is a projector that uses a light source as an LED, but it has a disadvantage that its brightness is relatively low.

Projectors using laser diodes and phosphor light sources have the advantages of lamps and LEDs at the same time because of their high brightness and long life.

Currently, most projectors that use laser diodes and phosphor light sources use reflective phosphors.

1 is a view for explaining a configuration of a laser projector according to the related art.

Referring to FIG. 1, the blue light emitted from the blue laser diode of the laser projector 1000 is passed through a blue Dichronic Filter.

The blue light passes through a plurality of collimator lenses to be converged by a phosphor wheel, and the condensed light is separated into blue light, green light and red light.

The phosphor wheel reflects the green light and the red light, and passes the blue light.

With respect to the moving direction of the blue light with respect to the phosphor wheel, the moving paths of the other colors are made different from each other.

At this time, the reason why the phosphor wheel transmits blue light is because the wavelength band of the light output from the blue laser diode overlaps with that of the blue laser diode, so that blue light returns to the blue laser diode side again if the reflection is made.

For this reason, there is a disadvantage in that a separate reflecting lens for reflecting green light and red light and a transmitting lens for transmitting blue light are required, and the number of optical parts is increased.

In addition, as the number of optical components increases, the size of the optical system also increases, and there is a structural disadvantage that a static type phosphor can not be constructed.

An object of the present invention is to provide a laser projector capable of reducing the number and size of optical components.

It is another object of the present invention to provide a laser projector applicable to both the fixed phosphor and the movable type phosphor of the present invention.

A laser projector according to an embodiment of the present invention includes a blue laser diode for outputting blue light; A split mirror transmitting a part of the blue light outputted from the blue light source and reflecting the remaining blue light; A phosphor that generates red light and green light by using a part of blue light transmitted from the split mirror; An interference mirror for reflecting red light and green light generated from the phosphor; And a color wheel for outputting any one of the remaining blue light, the red light, and the green light.

Each of the split mirror and the interference mirror may have a predetermined angle and may be disposed to intersect with each other.

The laser projector may further include a plus lens for collecting the light output from the blue laser diode, a minus lens for reducing the width of the collected blue light, and a diffusion plate for uniformly outputting the blue light transmitted from the minus lens .

The positive lens may be a convex lens, and the negative lens may be an anamorphic lens having an asymmetric curvature.

The phosphor may be a fixed phosphor.

The phosphor may be a phosphor wheel that modifies the wavelength of the blue light to generate any one of the red light, the green light, and the yellow light.

The interference mirror transmits all the blue light incident on the interference mirror and can totally reflect red light and green light.

The color wheel may sequentially output one or more of the blue light, the red light, and the green light in order to realize a color to be expressed in the microdisplay panel.

According to various embodiments of the present invention, the number and size of optical components can be reduced, and the cost of implementing a laser projector can be greatly reduced.

Also, the laser projector according to various embodiments of the present invention can be applied to a reflective phosphor wheel or a fixed phosphor, and is highly utilized.

1 is a view for explaining a configuration of a laser projector according to the related art.
2 is a diagram illustrating a configuration of a laser projector according to an embodiment of the present invention.
FIG. 3 is a view for explaining a path of light through the configuration according to the embodiment of FIG. 2. FIG.
4 is a diagram illustrating a configuration of a laser projector according to another embodiment of the present invention.
FIG. 5A is a graph showing the intensity of blue light incident on the fixed phosphor according to the embodiment of FIG. 2, and FIG. 5B is a graph showing the intensity of blue light incident on the phosphor wheel according to the example of FIG.
FIG. 6A is a graph showing an incident angle distribution of blue light incident on the fixed phosphor according to the embodiment of FIG. 2 according to the embodiment of the present invention, FIG. 6B is a graph showing the distribution of the incident angle of blue light incident on the phosphor wheel according to the example of FIG. It is a graph showing.

Hereinafter, embodiments related to the present invention will be described in detail with reference to the drawings. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

FIG. 2 is a view for explaining a configuration of a laser projector according to an embodiment of the present invention, and FIG. 3 is a view for explaining the path of light through the configuration according to the embodiment of FIG.

2, a laser projector 200 according to an exemplary embodiment of the present invention includes a blue laser diode 201, a positive lens 203, a negative lens 205, a diffusion plate 207, a blue split mirror 209 A first collimator lens 213, a second collimator lens 214, a fixed phosphor 215, a third collimator lens 217, a light tunnel 219, a color wheel 221, And a microdisplay panel 213.

The blue laser diode 201 can output blue light.

The positive lens 203 can collect the blue light output from the blue laser diode 201. The positive lens 203 may be a convex lens, but this is merely an example.

The minus lens 205 can reduce the width of blue light collected through the positive lens 203. [ As the width of the blue light decreases, the angle of incidence of the light incident on the fixed phosphor 215 to be described later is reduced, and the intensity of the light can be increased.

The negative lens 205 may be an anamorphic lens having an asymmetric curvature.

The diffusion plate 207 can uniformly output blue light whose width is reduced.

The blue split mirror 209 can transmit a part of the blue light transmitted from the diffusion plate 207 to the light tunnel 319 and the remaining blue light can be sent to the fixed phosphor 215.

3, the blue light 300 output from the blue laser diode 201 passes through the positive lens 203, the negative lens 205, and the diffusion plate 207 to the blue split mirror 209 Can be moved.

The blue split mirror 209 transmits a portion 301 of the blue light 300 transmitted from the diffusion plate 207 to the fixed phosphor 215 and the remaining blue light 303 to the light tunnel 219 .

In one embodiment, the ratio of the reflected light amount indicating the amount of light reflected by the blue split mirror 209 to the light tunnel 219 in the total light amount of the blue light may be preset.

The ratio of the amount of reflected light may be varied depending on the thickness and the composition of the coating layer constituting the blue split mirror 209.

The fixed phosphor 215 can pass through the blue split mirror 209 and modulate the wavelength of the incident blue light 301 to generate red light 305 and green light 306.

The fixed phosphor 215 can change the wavelength of some blue light 301 to generate red light 305 and green light 306. Red light 305 and green light 306 may be combined to represent yellow light.

The yellow interference mirror 211 can reflect yellow light that is a combination of the red light 305 and the green light 306 generated by the fixed phosphor 215 to the light tunnel 219. [

The yellow interference mirror 211 reflects the yellow light transmitted from the fixed phosphor 215 and directs it to the light tunnel 219.

On the other hand, the yellow interference mirror 211 can transmit blue light through 100% and reflect 100% of red light and green light.

Each of the blue split mirror 209 and the yellow interference mirror 211 may be disposed at an angle of 45 degrees. Further, the blue split mirror 209 and the yellow interference mirror 211 may be disposed to intersect with each other.

The first collimator lens 213 and the second collimator lens 214 may allow some blue light 301 to be incident on the fixed phosphor 215 in parallel.

The third collimator lens 217 may cause the remaining blue light 303 and red light 305 and green light 306 to emerge in parallel.

The color wheel 221 can output any of the blue light 303 reflected by the blue split mirror 209 and the red light 305 and green light 306 reflected from the yellow interference mirror 211.

The color wheel 221 can sequentially output light having a color to be expressed in the microdisplay panel 213. [

The microdisplay panel 223 uses one or more of the blue light 303 output from the color wheel 221 and the red light 305 and the green light 306 reflected from the yellow interference mirror 211, It is possible to output a video signal having a panel specific color.

4 is a diagram illustrating a configuration of a laser projector according to another embodiment of the present invention.

The laser projector 400 according to the embodiment of FIG. 4 may include a phosphor wheel 410 instead of the fixed phosphor 215, as compared with FIG.

The phosphor wheel 410 may be referred to as a movable phosphor.

The phosphor wheel 410 may modulate the wavelength of some blue light 301 transmitted through the blue split mirror 209 to produce red light, green light or yellow light.

That is, the phosphor wheel 410 may transform some of the blue light 301 into red light, green light or yellow light. The yellow light may be a composite of red light and green light.

The red light and the green light deformed by the phosphor wheel 410 may be reflected through the yellow interference mirror 211 and transmitted to the light tunnel 219.

FIG. 5A is a graph showing the intensity of blue light incident on the fixed phosphor according to the embodiment of FIG. 2, and FIG. 5B is a graph showing the intensity of blue light incident on the phosphor wheel according to the example of FIG.

Referring to FIG. 5A, the first distribution diagram 510 shows the distribution of the amount of incident blue light with reference to the center O1 of the fixed phosphor 215. FIG. The first graph 520 shows the distribution of the amount of blue light based on the x axis and the second graph 530 shows the distribution of the amount of blue light based on the y axis.

Referring to the first distribution diagram 510, the first x-axis graph 520 and the first y-axis graph 530 of FIG. 5A, the amount of blue light is uniformly distributed with respect to the center O1 of the fixed phosphor. That is, blue light is uniformly incident on the center O1.

Referring to FIG. 5B, the second distribution diagram 540 shows the distribution of the amount of incident blue light based on the center O2 of the phosphor wheel. The second x-axis graph 550 shows the distribution of the amount of blue light based on the x-axis, and the second y-axis graph 560 shows the distribution of the amount of blue light with respect to the y-axis.

Referring to the second distribution diagram 540, the second x-axis graph 550 and the second y-axis graph 560 of FIG. 5B, the amount of blue light is not evenly distributed with respect to the center O1 of the fixed phosphor Lt; / RTI > That is, the blue light is not uniformly incident on the center O2 but focused on a plurality of specific portions and is incident.

A uniform light should be incident on the phosphor to emit bright light. However, according to the embodiment of Fig. 1, since a general relay lens is used, blue light is not uniformly incident on the phosphor, and the phosphor may be damaged.

On the other hand, according to the embodiment of the present invention, since the blue light is uniformly diffused by using the negative lens 205 and the diffusion plate 207, the blue light outputted to the blue laser diode 201 is uniformly diffused to the phosphor Can be entered.

Accordingly, the phosphor can emit bright light without being damaged.

6A is a graph showing the brightness of light output from the fixed phosphor according to the incident angle of blue light incident on the fixed phosphor according to the embodiment of FIG. 2 according to the embodiment of the present invention, FIG. 6B is a graph FIG. 2 is a graph showing the brightness of light emitted from the phosphor wheel according to the incident angle of blue light incident on the phosphor wheel.

6A and 6B, the horizontal axis represents the incident angle of blue light, and the vertical axis represents the brightness (unit: candela) of blue light.

6A, the blue light incident angle distribution does not exceed 25 degrees at the maximum.

On the other hand, in the case of FIG. 6B, the blue light incident angle distribution can exceed 60 degrees at maximum.

The larger the angle of incidence of blue light, the more blue light can not be provided to the phosphor. Accordingly, the phosphor has a limitation in outputting bright light.

On the other hand, according to the embodiment of the present invention, the angle of incidence of blue light is limited to a maximum of 25 degrees or less, and blue light can be provided concentrating on the phosphor. Thus, the phosphor can emit bright light.

Claims (9)

  1. In a laser projector,
    A blue laser diode for outputting blue light;
    A split mirror transmitting a part of the blue light outputted from the blue light source and reflecting the remaining blue light;
    A phosphor that generates red light and green light by using a part of blue light transmitted from the split mirror;
    An interference mirror for reflecting red light and green light generated from the phosphor; And
    And a color wheel for outputting any one of the remaining blue light, red light and green light,
    Laser projector.
  2. The method according to claim 1,
    Each of the split mirror and the interference mirror has a predetermined angle,
    Laser projector.
  3. The method according to claim 1,
    A positive lens for collecting light output from the blue laser diode;
    A negative lens for reducing the width of the collected blue light; And
    And a diffusion plate for uniformly outputting the blue light transmitted from the negative lens
    Laser projector.
  4. The method of claim 3,
    The positive lens is a convex lens,
    The negative lens is an aspherical lens having an asymmetric curvature
    Laser projector.
  5. The method of claim 3,
    The diffusion plate
    Diffusing the blue light so that the blue light transmitted from the negative lens is uniformly incident on the center of the phosphor
    Laser projector.
  6. The method according to claim 1,
    The phosphor
    Fixed phosphor
    Laser projector.
  7. The method according to claim 1,
    The phosphor
    And a phosphor wheel for generating a red light, green light and yellow light by modifying the wavelength of the blue light,
    Laser projector.
  8. The method according to claim 1,
    The interference mirror
    All of the blue light incident on the interference mirror is transmitted, and all the red light and green light are reflected
    Laser projector.
  9. The method according to claim 1,
    The color wheel
    Sequentially outputting at least one of the blue light, the red light, and the green light in order to realize a color to be expressed in the micro display panel
    Laser projector.
KR1020170169432A 2017-12-11 2017-12-11 Laser projector KR20190069064A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020170169432A KR20190069064A (en) 2017-12-11 2017-12-11 Laser projector

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020170169432A KR20190069064A (en) 2017-12-11 2017-12-11 Laser projector
PCT/KR2018/015061 WO2019117515A1 (en) 2017-12-11 2018-11-30 Laser projector

Publications (1)

Publication Number Publication Date
KR20190069064A true KR20190069064A (en) 2019-06-19

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ID=66820511

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020170169432A KR20190069064A (en) 2017-12-11 2017-12-11 Laser projector

Country Status (2)

Country Link
KR (1) KR20190069064A (en)
WO (1) WO2019117515A1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012212436A1 (en) * 2012-07-16 2014-01-16 Osram Gmbh Light module for a projection device and method for generating the blue component in a light module for a projection device
KR20140073942A (en) * 2012-12-07 2014-06-17 삼성전자주식회사 Illumination system for beam projector
US9869442B2 (en) * 2014-06-26 2018-01-16 Texas Instruments Incorporated Hybrid illumination system having a blue laser diode, dichroic mirror and yellow transmissive phosphor converter for generating white light
CN106569381A (en) * 2015-10-08 2017-04-19 松下知识产权经营株式会社 Projection-type image display apparatus
KR20170133936A (en) * 2016-05-27 2017-12-06 에스케이텔레콤 주식회사 Light source device and projector comprising the same

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