WO2004021079A1 - 投写型表示装置 - Google Patents
投写型表示装置 Download PDFInfo
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- WO2004021079A1 WO2004021079A1 PCT/JP2003/010870 JP0310870W WO2004021079A1 WO 2004021079 A1 WO2004021079 A1 WO 2004021079A1 JP 0310870 W JP0310870 W JP 0310870W WO 2004021079 A1 WO2004021079 A1 WO 2004021079A1
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- WIPO (PCT)
- Prior art keywords
- image
- screen
- liquid crystal
- projected
- display device
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
- H04N7/0117—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level involving conversion of the spatial resolution of the incoming video signal
- H04N7/0122—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level involving conversion of the spatial resolution of the incoming video signal the input and the output signals having different aspect ratios
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/4104—Peripherals receiving signals from specially adapted client devices
- H04N21/4122—Peripherals receiving signals from specially adapted client devices additional display device, e.g. video 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
-
- 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
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
- G02F1/13347—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals working in reverse mode, i.e. clear in the off-state and scattering in the on-state
-
- 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
- H04N2005/745—Control circuits therefor
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/46—Receiver circuitry for the reception of television signals according to analogue transmission standards for receiving on more than one standard at will
Definitions
- the present invention relates to a projection display device, and more particularly to a projection display device suitable for use in a relatively narrow space such as in a house.
- the conventional projection type display apparatus as the full B down preparative formula for projecting the front force 3 ⁇ 4 et video on reflection-type disk rie down became separately from the projection display device (front projection type), the projection It is broadly divided into rear-type (rear-projection type) projectors, which project images from the rear onto a transmission-type screen integrated with a display device.
- a reflective screen is generally mounted on a living room wall or the like of a house, and the reflective screen is installed.
- the front projection display is installed at a position where images can be projected on the screen.
- the conventional rear projection display device has a large size (for example, having a depth of several tens of cm and a vertical length) because the entire optical path from the projection lens to the transmission screen is housed in the housing.
- the sides are about 1 m each).
- conventional rear projection display devices are generally installed in corners of living rooms in houses.
- the size of the wall on which such a reflective screen can be mounted is limited in a house, and the conventional front projection display device is not suitable for a house.
- the degree of freedom of the installation location inside is small.
- conventional large-sized rear projection display devices also have a low degree of freedom in installation in a house and give a feeling of oppression to the living environment when not in use.
- the present invention is suitable for use in relatively narrow spaces such as in a house, has a large degree of freedom in an installation place, and has a small feeling of oppression when not in use.
- An object of the present invention is to provide a projection display device.
- the present applicant has proposed a projection display device that projects an image on a screen, when light is scattered when a voltage is applied and the voltage is not applied.
- a liquid crystal panel that uses a polymer dispersed liquid crystal that transmits light is attached to the main unit as a screen, and the image output from this main unit is projected onto the screen from the front. Suggest what you have done.
- This projection-type display device projects images from the front onto a screen attached to the device body (that is, the device body and the screen are integrated). Device. Therefore, there is no need to attach a screen to a wall or the like in a house unlike a conventional front projection display device. Also, unlike the rear projection display device, the optical path from the projection lens to the screen does not need to be housed in the housing, so that the size can be reduced. As a result, even in a relatively small space such as a house, the degree of freedom of the installation location is increased.
- this projection display device a liquid using polymer dispersed liquid crystal is used.
- the screen is composed of crystal panels.
- This screen can be used to project an image by making the light scattered (opaque), and when the image is not projected (projection type display). When the device is not in use), it can be made inconspicuous by making it transparent (transparent). Therefore, the screen does not stand out when not in use as in the conventional front projection display device. Further, as described above, this projection display device can be smaller in size than the rear projection display device. As a result, even a relatively narrow space such as a house does not give a feeling of oppression when not in use.
- the liquid crystal panel constituting the screen uses a polymer dispersed liquid crystal which scatters light when a voltage is applied and transmits light when no voltage is applied. Therefore, when the image is not projected, the screen can be made transparent without applying a voltage, thereby reducing standby power consumption when not in use.
- adjustment means for adjusting the size of the image projected on the screen and adjustment means according to the aspect ratio of the image to be projected is preferable to further provide control means for controlling the pressure.
- an area where an image is not projected changes depending on an aspect ratio of the image to be projected. Therefore, by adjusting the size of the image projected on the screen in accordance with this aspect ratio, images having various aspect ratios can be respectively formed into predetermined shapes. You can now project on the screen at the maximum angle of view.
- the screen is formed in an elliptical shape.
- the screen becomes transparent when not in use, so that the visibility of the user on the screen is reduced. Therefore, by making the screen elliptical, the safety when not in use is enhanced (even if the user touches the screen without noticing it, the corners) To avoid injury).
- this screen is an oval layer in which the ratio of the major axis to the minor axis is in the range of approximately 1.3 to 1.7.
- the current aspect ratio video (NTSC / PAL video with an aspect ratio of 4: 3, high-vision video with an aspect ratio of 16: 9) can be obtained.
- Cinema-scope images can be projected so that the proportion of wasted areas where none of these images are projected on an elliptical screen is minimized. become.
- an electrode is provided on a liquid crystal panel constituting a screen so as to distinguish an area where an image is projected from an area where an image is not projected.
- an electrode voltage control means for controlling a voltage supplied to the electrodes.
- the present applicant attaches a liquid crystal panel using polymer dispersed liquid crystal to the main body of the device as a screen.
- the present invention proposes an apparatus having adjusting means for adjusting the size of an image projected on a screen and control means for controlling the adjusting means in accordance with an aspect ratio of the image to be projected. .
- This projection display device projects images from the front onto a screen attached to the main body of the device (that is, the front main body and the screen are integrated).
- a display device Therefore, there is no need to mount a screen on a wall or the like in a house unlike a conventional front projection display device. Also, unlike the rear projection display device, the optical path from the projection lens to the screen does not need to be housed in the housing, so that the size can be reduced. As a result, even in a relatively small space such as a house, the degree of freedom of the installation location is increased.
- a screen is constituted by a liquid crystal panel using a polymer dispersed liquid crystal.
- This screen is capable of projecting an image by making the light scattered (opaque), and also not projecting the image (of a projection display device). When not in use, it can be made inconspicuous by making it transparent (transparent). Therefore, conventional front projection The screen does not stand out when not in use, such as when the mold table is not refitted. Further, as described above, the size of the projection display device can be smaller than that of the rear projection display device. As a result, even in a relatively small space such as a house, there is no pressure when not in use.
- the area where the image is not projected varies depending on the aspect ratio of the image to be projected, but the size of the image to be projected on the screen is reduced.
- images with various aspect ratios can be projected onto a screen of a predetermined shape at the maximum angle of view.
- a discriminating means for discriminating an aspect ratio of an image to be projected by an input video signal
- control means for controlling the adjusting means according to the obtained aspect ratio are preferable to further include control means for controlling the adjusting means according to the obtained aspect ratio.
- the screen is formed in an elliptical shape.
- the screen becomes transparent when not in use, so that the visibility of the user on the screen is reduced. Therefore, by making the screen elliptical, safety when not in use is enhanced (even if the user touches the screen without noticing it, corner ) To avoid injury).
- the screen is made elliptical as in-, there will be an area where no image is projected around the rectangular area where the image is projected, and this image will not be projected.
- the area varies depending on the aspect ratio of the projected image, the aspect ratio of the projected image is determined, and the size of the image projected on the screen is determined by this aspect ratio. According to the cut ratio
- the maximum screen angle can be projected onto a screen with a shape.
- the screen with- has a ratio of the long axis to the axis of about 1.31.7. It is more preferable that the shape is an elliptical shape in the range described above. Therefore, • 9, the current video with various aspect ratios (NTSC / PAL video with a 4: 3 aspect ratio) and the high bin video with 16: 9 video ratio.
- the LCD panel that constitutes the screen separates the area where the image is projected from the area where the image is not projected.
- the area on the LCD panel where the image is projected by an electrode voltage control means that controls the voltage supplied to these electrodes when the image is projected It is preferable that light be scattered only by the light.
- a liquid crystal panel constituting a half-screen scatters light when a voltage is applied and transmits light when no voltage is applied. It is preferable that a liquid crystal using a molecular dispersion liquid crystal is used.
- FIG. 1 is a perspective view showing an external configuration of a video projector according to the present invention.
- FIG. 2 is a diagram showing a cross-sectional structure of the screen of FIG.
- FIG. 3 is a diagram showing the composition and characteristics of the liquid crystal layer of FIG.
- FIG. 4 is a view showing the arrangement and shape of individual ITO electrodes in the ITO electrode group on the glass substrate of FIG.
- FIG. 5 is a diagram showing a range in which the ITO electrodes of the ITO electrode group on the two glass substrates of FIG. 2 overlap on the screen of FIG.
- FIG. 6 is a diagram showing a basic configuration of an optical system of the apparatus main body of FIG.
- FIG. 7 is a diagram showing a portion related to the present invention in the circuit configuration of the apparatus main body in FIG.
- FIG. 8 is a diagram showing a table in the ROM of FIG.
- FIG. 9 is a diagram showing a range in which an image is projected based on the contents of the table of FIG. 8 out of the screen of FIG.
- FIG. 10 is a diagram showing a useless area of the screen of FIG. 1 where an image is not projected.
- Figure 11 shows the relationship between the values of a, b, and p in Equations (1) and (2), and the corresponding calculation results of S l and the area of the entire screen in Equation (3).
- Figure 12 is a diagram showing the relationship between the values of a, b, and p in equations (1) and (2) and the corresponding calculation results of S1 and the entire area of screen 1 in equation (3).
- FIG. 13 is a diagram showing a table in the ROM of FIG.
- FIG. 14 is a flowchart showing the zoom ratio control and screen drive processing executed by the CPU of FIG.
- FIG. 15 is a diagram showing a modification example of the table in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. BEST MODE FOR CARRYING OUT THE INVENTION the present invention will be specifically described with reference to the drawings.
- FIG. 1 shows an external configuration of a video projection device according to the present invention.
- a screen 1 and a mirror 3 for reflecting the projection light from the apparatus body 2 toward the screen 1 are attached to the apparatus main body 2.
- Screen 1 has an elliptical shape, and the ratio of the length of the major axis to the length of the minor axis of the ellipse is in the range of 1.3 to 1.7 for the reason described below. .
- This screen 1 is composed of a liquid crystal panel using polymer dispersed liquid crystal.
- FIG. 2 shows a cross-sectional structure of the screen 1.
- An ITO electrode group 13 composed of a plurality of ITO electrodes formed on a glass substrate 11 via a PET material 12 and a plurality of ITO electrodes formed on a glass substrate 14 via a PET material 15
- a liquid crystal layer 17 having a thickness of about several tens of micron is sandwiched between the ITO electrode group 16 composed of.
- a liquid crystal panel used for the screen 1 is composed of an ITO electrode group 13, a liquid crystal layer 17, an ITO electrode group 16 and a power supply, and comprises an ITO electrode group 13 and an ITO electrode group 16. Are formed so as to intersect (orthogonally) with each other.
- FIG. 3 shows the composition and characteristics of the liquid crystal layer 17.
- the liquid crystal layer 17 is a mixture of a polymer material 18 and dispersed liquid crystal molecules 19, and when no voltage is applied, the dispersed liquid crystal molecules 19 are aligned as shown in FIG. 3A. This increases the light transmittance (becomes transparent), while scattering the light (becomes opaque) when a voltage is applied, as shown in Figure 3B.
- the liquid crystal panel constituting screen 1 is a general polymer-dispersed liquid crystal (which scatters light when no voltage is applied and transmits light when a voltage is applied). Conversely, the light is scattered when a voltage is applied and transmits light when no voltage is applied. Molecularly dispersed liquid crystal is used.
- a polymer-dispersed liquid crystal that scatters light when a voltage is applied and transmits light when a voltage is not applied is, for example, Appl published on January 20, 1992. Phys. Lett. 60 (3), page 392.
- FIG. 4A and 4B show the arrangement and shape of the individual ITO electrodes in the ITO electrode group 13 on the glass substrate 11 and the ITO electrode group 16 on the glass substrate 14.
- the soil is set so as to be symmetrical with respect to the major axis of the ellipse of the screen 1.
- a pair of ITO electrodes 13 (1), 13 (2), and 13 (3) are arranged in order from the long axis 3S, and the remaining part is ITO. Electrodes 13 (4) are arranged.
- the ITO electrode group 16 is symmetrical with respect to the short axis of the ellipse of the screen 1 so that a pair of the electrodes are arranged in order from a point farthest from the short axis.
- O electrode 1 6 (4) is arranged 0
- FIG. 5 shows a range on the screen 1 where the individual ITO electrodes in the ITO electrode group 13 and the individual ITO electrodes in the ITO electrode group 16 overlap.
- the area where the TO electrode 16 (4) overlaps is a rectangle whose horizontal size and vertical size ratio is 4: 3 and whose four corners are located on the circumference of the ellipse, as shown in Fig. 5B. Electrodes 13 (3) and 13 (4) and IT
- the area where the O electrodes 16 (3) and 16 (4) overlap is a rectangle with four corners located on the circumference of the ellipse with a ratio of the horizontal size to the vertical size of 16: 9. o
- the ITO electrode 13 (4) and the ITO electrode 16 (2) The range where ⁇ 16 (4) overlaps is a rectangle whose horizontal size and vertical size ratio are 2.35: 1 and whose four corners are located on the circumference of the ellipse.
- the device body 2 in Fig. 1 is a three-panel transmissive liquid crystal projector.
- FIG. 6 shows the basic configuration of the optical system of the apparatus main body 2.
- the outgoing light from the UHP lamp (high-pressure mercury lamp) 21 is collimated by the reflector 22 and enters the dichroic mirror 23.
- the red light of the incident light to the die mirror 23 is reflected by the die mirror 23, reflected by the mirror 24, and irradiated to the liquid crystal panel 28 (R). .
- the green light of the light entering the die mirror 23 passes through the die mirror 23, is reflected by the die mirror 25, and is reflected by the liquid crystal panel 28. (G).
- the blue light of the light incident on the dichroic mirror 23 passes through the dichroic mirrors 23 and 25, respectively, and is reflected by the mirrors 26 and 27, respectively.
- the light is synthesized by the shadow prism 29, exits from the projection lens 30, and is projected on the screen 1 via the mirror 3 in FIG.
- FIG. 7 shows a configuration of a part related to the present invention in the circuit of the apparatus main body 2 (a circuit for driving the liquid crystal panels 28 (R), 28 (G), 28 (B) in FIG. Are not shown).
- the CPU 31, ROM 32, RAM 33, EPROM 34, and human output port 35 are connected to each other via a bus 36.
- the input / output port 35 has an aspect ratio discriminating circuit 37, a screen driving circuit 38, an amplifying circuit 39, and an operation panel 40 (see FIG. The operation keys and the display above are connected.
- the aspect ratio discriminating circuit 37 discriminates the aspect ratio of the video signal input from the outside to the main unit 2, and outputs a signal indicating the discrimination result to the input / output port 35 and the bus 36.
- the amplifying circuit 39 is connected to a stepping motor 41 which is a zoom mechanism of the projection lens 30 (FIG. 6).
- the CPU 31 controls each part of the projection display device by executing a program stored in the ROM 32.
- the ROM 32 also includes programs for zoom ratio control and screen drive processing as shown in Fig. 14 below.
- the ROM 32 also has a table (zoom ratio table) in which the aspect ratio of the video signal and the data of the zoom ratio of the projection lens 30 are associated with each other, and the aspect ratio and the screen of the video signal. And a table (drive voltage table) in which drive voltage data for each ITO electrode of the ITO electrode group 13 and the ITO electrode group 16 of the first electrode are associated with each other.
- a table zoom ratio table
- drive voltage table drive voltage data for each ITO electrode of the ITO electrode group 13 and the ITO electrode group 16 of the first electrode are associated with each other.
- FIG. 8 shows the contents of the zoom ratio table in ROM 32.
- FIG. 9 shows a range in which an image is projected according to the contents of the zoom ratio table in the first screen.
- the zoom ratio A (A is a constant) corresponds to the aspect ratio 4: 3 (the aspect ratio of the NTS CZ PAL system), and the aspect ratio 16: 9 (the high-vision system aspect ratio).
- Zoom ratio of 1.17 A, and an aspect ratio of 2.35: 1 (cinemas The zoom ratio of 1.31 A corresponds to the (aspect ratio).
- the zoom ratio A is the circumference of the ellipse of screen 1 that is just around the four corners of the 4: 3 aspect ratio image projected on screen 1. (I.e., the image is projected in the area where the ITO electrodes 13 (2) to 13 (4) and the single electrode 16 (4) in FIG. 5A just overlap). It is such a value.
- the aspect ratio 16 projected on the screen 1 is as follows: The four corners of the image 9 are located on the circumference of the ellipse of screen 1 (that is, the ITO electrodes 13 (3) and 13 (4) and 13 (4) in FIG. 5B and the ITO electrode 16). (3) and 16 (4) are projected, and the image is projected at the zoom ratio of 1.31 A. As shown in Figure 9C, the aspect ratio projected on screen 1 is 2 The four corners of the 3 5: 1 image are located on the circumference of the ellipse of screen 1 (that is, just the ITO electrode 13 (4) and the ITO electrode 16 (2) in FIG. 5C). To 16 (4) and the image is projected in the area where and overlap).
- the screen with the aspect ratio of 4: 3 and the image with the aspect ratio Ar are arranged so that the four corners are located on the circumference of the ellipse of screen 1 in this manner.
- the area specified by diagonal lines in Screen 10 of Screen 1 is a useless area where no video is projected.
- the area S 1 of the area where this image is not projected is expressed by the following equation (3).
- Figure 11 shows that, when this aspect ratio Ar is 16: 9 (the high-vision type aspect ratio), the values of a, b, and P satisfying the above equations (1) and (2) ,
- the corresponding area S l, and the relationship between the calculation result of the entire area of screen 1 and a / b (the length of the major axis length with respect to the minor axis length of the ellipse of screen 1) Is shown in the range of approximately 1.3 to 1.7.
- Figure 12 shows that the values of a, b, and p satisfying the above formulas (1) and (2) when the aspect ratio Ar is 2.35: 1 (the cinema scope target ratio). And the corresponding area SI and the relationship between the calculation results of the total area of screen 1 and a / b (the ratio of the length of the major axis to the length of the minor axis of the ellipse of screen 1) ) Is shown in the range of approximately 1.3 to 1.7.
- a Z b (the ratio of the length of the major axis to the length of the minor axis of the ellipse of screen 1) is approximately in the range of 1.3 to 1.7, It is possible to reduce the ratio of a useless area where no image is projected in the entire screen 1. For this reason, the ratio of the major axis length to the minor axis length of the ellipse of Screen 1 is in the range of 1.3 to 1.7 as described above.
- FIG. 13 shows the contents of the aforementioned drive voltage table in ROM 32.
- the aspect ratio of 4: 3 (the aspect ratio of the NTSCZPAL system) includes the ITO electrodes 13 (2) to 13 (4) in the ITo electrode group 13.
- This drive voltage is in the range of the screen 1, that is, the ITO electrode 13 (2)
- the drive voltage is such that only the area in which the 13 (4) and the Ito electrode 16 (4) overlap (FIG. 5A) is opaque, and the rest is clear.
- the aspect ratio 16: 9 (the aspect ratio of the high-visibility system) includes the ITO electrodes 13 (3) and 13 (4) in the ITo electrode group 13 and the ITo electrode group 16 A voltage is applied between the ITO electrodes 16 (3) and 16 (4), and the ITO electrodes in the ITo electrode group 13 13 (1) and 13 (2) and ITO electrode 1 in ITo electrode group 16
- the driving voltage of- is the range of the screen 1 where the ITO electrodes 13 (3) and 13 (4) overlap the ITO electrodes 16 (3) and 16 (4) ( Drive voltage that makes only Figure 5B) opaque and the rest transparent
- the aspect ratio 2-35: 1 (the cinemap aspect ratio) includes the ITo electrode 13 (4) and the ITO electrode in the ITO electrode group 13.
- a voltage is applied between 3 (3) and the ITO electrode 16 (1) in the ITo electrode group 16 (the ITO electrode 13 (4) and the ITO electrode 16 (1) are equipotential).
- the electrodes 13 (1) to 13 (3) and the ITO electrodes 16 (2) to 16 (4) have the same potential.
- This driving voltage is opaque only in the area of the screen 1 where the ITO electrode 13 (4) and the ITO electrodes 16 (2) to 16 (4) overlap (FIG. 5C),
- the RAM 31 temporarily stores various data generated in the process of the CPU 31 executing the program in the ROM 32.
- Figure 14 shows the zoom ratio control executed by CPU 31 • Screen drive This is a flowchart showing dynamic processing. This process starts when a signal indicating the result of the discrimination of the aspect ratio is sent from the aspect ratio discrimination circuit 37.
- the zoom ratio table in the ROM 32 Referring to, the zoom ratio corresponding to the aspect ratio determined by the aspect ratio determination circuit 37 is determined as the zoom ratio of the projection lens 30 (step S1).
- step S2 based on the data of the current position of the stepping motor 41 in the EPROM 34 and the zoom ratio determined in step S1, the projection lens 30 is set to the determined zoom ratio.
- the relative movement amount of the stepping motor 41 is calculated (step S2).
- a control signal for moving the stepping motor 41 by the relative movement amount calculated in step S2 is sent to the bus 36, the input / output port 3
- the signal is supplied to the stepping motor 41 via the amplifier circuit 39 (step S3).
- the drive voltage corresponding to the aspect ratio determined by the aspect ratio determination circuit 37 is calculated. It is determined as the driving voltage of screen 1 (step S4).
- control is performed to supply the determined drive voltage to the I ⁇ O electrode group 13 of the screen 1 (FIG. 1) and to each ITO electrode (FIG. 2 and FIG. 4) in the ITO electrode group 16.
- the signal is supplied to the screen drive circuit 38 via the bus 36 and the input / output port 35 (step S5). Then, the processing ends.
- This projection display device projects images from the screen V1 attached to the device body 2 (that is, the device body 2 and the screen y1 are integrated). Use a projection display. Power Therefore, there is no need to attach a screen to a wall or the like in a house unlike a conventional front projection display device. Also, unlike the rear projection display device, the optical path from the projection lens to the screen (the optical path from the projection lens 30 in Fig. 6 to the mirror 3 and screen 1 in Fig. 1). ) Is not stored in the housing, so the size is small. This increases the flexibility of the installation location, for example, in a house, such as putting it on a table or carrying it to another room.
- the screen 1 is constituted by a liquid crystal panel using a polymer dispersed liquid crystal.
- This screen 1 is capable of projecting an image by making the state of scattering light (opaque), and also not projecting an image (of a projection display device). When not in use, it can be made inconspicuous by making it transparent (transparent). Therefore, the screen does not stand out when not in use as in the conventional front projection display device.
- the size of the projection display device is smaller than that of the rear projection display device. Thereby, for example, even in a house, there is no sense of oppression in the living environment when not in use.
- the liquid crystal panel constituting screen 1 uses a polymer-dispersed liquid crystal that scatters light when voltage is applied and transmits light when no voltage is applied. It is. Therefore, when no image is projected, the screen 1 can be made transparent without applying a voltage, so that standby power consumption when not in use can be reduced.
- the screen 1 when not in use, the screen 1 becomes transparent, so that the visibility of the screen 1 to the user is reduced.
- the screen 1 is elliptical, The safety when not in use is high (even if the user touches screen 1 without noticing, there is no corner to prevent injury).
- an aspect ratio determination circuit 37 (FIG. 7) As a result, the aspect ratio of 4: 3 is determined, so that the zoom ratio control and screen drive processing of CPU 31 (FIG. 7) are performed.
- the image is projected in a range where the I T O electrodes 13 (2) to 13 (4) of A and the I T O electrode 16 (4) overlap).
- a driving voltage is applied to the screen 1 so that only the area where the 13 (2) to 13 (4) overlaps the ITO electrode 16 (4) becomes opaque.
- the aspect ratio determination circuit 37 Since the aspect ratio 16: 9 is determined by the zoom ratio control and the screen drive processing of the CPU 31, the figure ratio is determined.
- the image on screen 1 is positioned so that the four corners of the image with an aspect ratio of 16 9 are exactly on the circumference of the ellipse on screen 1. Is projected (that is, the ITO electrode 13 in FIG.
- the part of the screen 1 where the image is projected (the area where the ITO electrodes 13 (3) and 13 (4) overlap the ITO electrodes 16 (3) and 16 (4)) Since the image becomes opaque, this image can be viewed from the front of screen 1 and the portion of screen 1 where the image is not projected remains transparent.
- the aspect ratio discriminating circuit 37 uses this signal.
- the CPU 31's zoom ratio control and screen drive processing allow the aspect ratio 2.35 as shown in FIG. 9C.
- the image is projected on screen 1 so that the four corners of image 1 are exactly on the circumference of the ellipse of screen 1 (that is, just as in Fig. 5C).
- An image is projected in a range where the ITO electrode 13 (4) and the ITO electrodes 16 (2) to 16 (4) overlap), as well as the ITO electrode 13 (4) and the ITO electrode.
- a driving voltage is applied to the screen 1 so that only the area where 16 (2) to 16 (4) overlaps is made opaque.
- the part of the screen 1 where the image is projected (the area where the ITO electrodes 13 (4) and 16 (2) to 16 (4) overlap) becomes opaque. Therefore, this image can be seen from the front of screen 1 and the portion of screen 1 where the image is not projected remains transparent.
- the aspect ratio is 4: 3 (NTS CZ PAL system), the aspect ratio is 16: 9 (high vision system), and the aspect ratio is 2
- NTS CZ PAL system NTS CZ PAL system
- the aspect ratio 16: 9 (high vision system)
- the aspect ratio is 2
- the four corners of the image projected on screen 1 are located on the circumference of the screen 1 ellipse.
- the video is a screen 1 is projected at the maximum angle of view.
- the LCD panel that constitutes Screen 1 has an ITO electrode that distinguishes between the area where the image is projected and the area where the image is not projected.
- the ratios correspond to the three aspect ratios of 2.35: 1. However, the present invention is not limited to this, and the aspect ratios other than 4: 3, 16: 9, and 2.35: 1 are also available. (For example, an aspect ratio of 1.85 (Amary Power Vista)), these tables, ITO electrode groups 13 and 16, and processing may be made to correspond.
- the zoom ratio control / screen driving process of the CPU 31 determines the zoom ratio uniquely from the determination result of the aspect ratio determination circuit 37. Has become.
- the specified zoom ratio may be given priority.
- the outer shape of the screen 1 is not limited to this, and the present invention can be widely applied.
- a screen having a predetermined shape regardless of a rectangle or a circle
- an area where an image is not projected changes depending on an aspect ratio of the image to be projected. Therefore, by adjusting the size of the image projected on the screen in accordance with this aspect ratio, images having various aspect ratios can be respectively formed into screens having predetermined shapes. Projector with the maximum angle of view.
- the liquid crystal panel constituting screen 1 uses a polymer dispersed liquid crystal that scatters light when a voltage is applied and transmits light when no voltage is applied. It has become.
- this liquid crystal panel uses a general polymer-dispersed liquid crystal (which scatters light when no voltage is applied and transmits light when a voltage is applied). May be used.
- the part of the screen 1 where the image is not projected can be made transparent, and the image can be displayed as if it were floating in the air.
- the device main body 2 is a three-panel transmissive liquid crystal projector.
- the apparatus main body 2 may be a single-panel transmissive liquid crystal projector or a spatial light modulator other than a liquid crystal panel (for example, a DMD (digital mirror device)). It may be a projector or a CRT-based projector.
- the light from the device main body 2 is reflected by the mirror 3 and projected on the screen 1, but the light from the device main body is directly projected on the screen. It may be.
- the image projected from the apparatus body 2 and obtained as diffused light on the screen 1 is viewed from the front by the user, but the image obtained as diffused light is viewed from the front. It is also possible for the user to see the rear view.
- the effect and the image with various aspect ratios can be projected on the elliptical screen at the maximum angle of view. The effect is also obtained.
- the video can be displayed as if it were floating in the air (without making the user aware of the presence of the screen).
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03791346A EP1439411A4 (en) | 2002-08-29 | 2003-08-27 | PROJECTOR |
JP2004532734A JPWO2004021079A1 (ja) | 2002-08-29 | 2003-08-27 | 投写型表示装置 |
US10/493,850 US7336289B2 (en) | 2002-08-29 | 2003-08-27 | Projection type display apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-251642 | 2002-08-29 | ||
JP2002251642 | 2002-08-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004021079A1 true WO2004021079A1 (ja) | 2004-03-11 |
Family
ID=31972691
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/010870 WO2004021079A1 (ja) | 2002-08-29 | 2003-08-27 | 投写型表示装置 |
Country Status (4)
Country | Link |
---|---|
US (1) | US7336289B2 (ja) |
EP (1) | EP1439411A4 (ja) |
JP (1) | JPWO2004021079A1 (ja) |
WO (1) | WO2004021079A1 (ja) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2005315994A (ja) * | 2004-04-27 | 2005-11-10 | Ginga Net:Kk | 講演装置 |
JP2009531733A (ja) * | 2006-03-31 | 2009-09-03 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | 切替え可能なキャンバスを使用する環境光生成を有するディスプレイ装置 |
JP2010197486A (ja) * | 2009-02-23 | 2010-09-09 | Seiko Epson Corp | 画像表示システム、画像通信システム |
WO2011043100A1 (ja) * | 2009-10-09 | 2011-04-14 | シャープ株式会社 | 表示パネル、表示システム、携帯端末、電子機器 |
JP2011175110A (ja) * | 2010-02-24 | 2011-09-08 | Seiko Epson Corp | 画像形成装置および背面投影型表示装置 |
JP2013076955A (ja) * | 2011-09-30 | 2013-04-25 | Seiko Epson Corp | スクリーンおよび画像表示システム |
US9028074B2 (en) | 2011-09-30 | 2015-05-12 | Seiko Epson Corporation | Image display system and control apparatus |
US9091875B2 (en) | 2011-10-07 | 2015-07-28 | Seiko Epson Corporation | Screen and image display system |
JP2020086085A (ja) * | 2018-11-22 | 2020-06-04 | 凸版印刷株式会社 | 調光機能付き反射型プロジェクションスクリーン |
US10908490B2 (en) | 2012-06-08 | 2021-02-02 | Cardinal Ig Company | Reflective projection screen comprising a variable light scattering system |
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US7491661B2 (en) * | 2004-12-28 | 2009-02-17 | Asml Netherlands B.V. | Device manufacturing method, top coat material and substrate |
MX2008012427A (es) * | 2006-03-31 | 2008-10-09 | Koninkl Philips Electronics Nv | Aparato de pantalla con generacion de luz ambiental usando cubiertas conmutables. |
WO2009040698A1 (en) * | 2007-09-24 | 2009-04-02 | Koninklijke Philips Electronics N.V. | A display device comprising a background screen |
EP2320272A4 (en) * | 2008-08-27 | 2011-11-23 | Panasonic Corp | PROJECTION VIDEO DISPLAY DEVICE |
US20140132909A1 (en) * | 2012-11-13 | 2014-05-15 | 3M Innovative Properties Company | Switchable transparent display |
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- 2003-08-27 JP JP2004532734A patent/JPWO2004021079A1/ja not_active Abandoned
- 2003-08-27 US US10/493,850 patent/US7336289B2/en not_active Expired - Fee Related
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Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005315994A (ja) * | 2004-04-27 | 2005-11-10 | Ginga Net:Kk | 講演装置 |
JP2009531733A (ja) * | 2006-03-31 | 2009-09-03 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | 切替え可能なキャンバスを使用する環境光生成を有するディスプレイ装置 |
JP2010197486A (ja) * | 2009-02-23 | 2010-09-09 | Seiko Epson Corp | 画像表示システム、画像通信システム |
WO2011043100A1 (ja) * | 2009-10-09 | 2011-04-14 | シャープ株式会社 | 表示パネル、表示システム、携帯端末、電子機器 |
JP2011175110A (ja) * | 2010-02-24 | 2011-09-08 | Seiko Epson Corp | 画像形成装置および背面投影型表示装置 |
JP2013076955A (ja) * | 2011-09-30 | 2013-04-25 | Seiko Epson Corp | スクリーンおよび画像表示システム |
US9028074B2 (en) | 2011-09-30 | 2015-05-12 | Seiko Epson Corporation | Image display system and control apparatus |
US9063365B2 (en) | 2011-09-30 | 2015-06-23 | Seiko Epson Corporation | Screen and image display system |
US9091875B2 (en) | 2011-10-07 | 2015-07-28 | Seiko Epson Corporation | Screen and image display system |
US10908490B2 (en) | 2012-06-08 | 2021-02-02 | Cardinal Ig Company | Reflective projection screen comprising a variable light scattering system |
JP2020086085A (ja) * | 2018-11-22 | 2020-06-04 | 凸版印刷株式会社 | 調光機能付き反射型プロジェクションスクリーン |
JP7268337B2 (ja) | 2018-11-22 | 2023-05-08 | 凸版印刷株式会社 | 調光機能付き反射型プロジェクションスクリーン |
Also Published As
Publication number | Publication date |
---|---|
EP1439411A4 (en) | 2006-10-25 |
US7336289B2 (en) | 2008-02-26 |
JPWO2004021079A1 (ja) | 2005-12-22 |
EP1439411A1 (en) | 2004-07-21 |
US20050036084A1 (en) | 2005-02-17 |
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