WO2004064408A1 - Procede et dispositif pour scanner une image dans un systeme de projection - Google Patents

Procede et dispositif pour scanner une image dans un systeme de projection Download PDF

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Publication number
WO2004064408A1
WO2004064408A1 PCT/IB2003/006288 IB0306288W WO2004064408A1 WO 2004064408 A1 WO2004064408 A1 WO 2004064408A1 IB 0306288 W IB0306288 W IB 0306288W WO 2004064408 A1 WO2004064408 A1 WO 2004064408A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
projection
display device
image display
scanning
Prior art date
Application number
PCT/IB2003/006288
Other languages
English (en)
Inventor
Adrianus J. S. M. De Vaan
Ronald M. A. M. Breukers
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Priority to AU2003288663A priority Critical patent/AU2003288663A1/en
Publication of WO2004064408A1 publication Critical patent/WO2004064408A1/fr

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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]
    • H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
    • 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
    • H04N9/3167—Modulator illumination systems for polarizing the light beam

Definitions

  • the present invention relates to the field of projection-type image display devices, and particularly to a projection-type image display device allowing scanning of an image as well as a scanning method.
  • projection type image display devices are increasing, because such display devices have become very popular for presentations at meetings, conferences, home entertainment, etc.
  • One reason for this is the increasing affordability.
  • display devices have a higher quality of the image and a more compact construction.
  • the requirement for a higher resolution and a better contrast in the displayed image is, however, getting more stringent.
  • the current projection type image display devices have gaps in between the pixels, i.e. they do not have a 100% fill-factor. These gaps are needed for the electronics supplying each pixel and can be seen as a black frame around each pixel when taking a closer look at the displayed image. Manufacturing displays with a better fill-factor is very difficult and expensive.
  • US 5.032.924 suggests a projection type video image display device comprising means for scanning the image at a non-linear rate and means for modulating the basic illumination and intensity of pixels as a function of scanning speed.
  • a light source is coupled to provide a beam through a shutter assembly, which in turn is coupled to a horizontal scanning mirror and, thence, to a vertical scanning mirror, the output scan of which is directed to impinge upon a screen.
  • the horizontal scanning mirror is arranged to scan bi-directionally, left and right, with a scan characteristic which is preferably sinusoidal.
  • the vertical scanning mirror scans at a relatively slow rate of speed.
  • This object is achieved by providing an optical sub-system in the imaging parts to scan the pixels of the display over the image plane such that each pixel illuminates a multitude of positions within a unit cell having a predetermined area size.
  • Another object of the invention is to provide an improved method of scanning an image in a projection type image display.
  • This object is achieved by a method of providing an optical sub-system in the imaging parts to scan the pixels of the display over the image plane such that each pixel illuminates a multitude of positions within a unit cell having a predetermined area size.
  • Fig. 1 discloses a schematic view of a projection type image display device according to a general embodiment of the invention
  • Fig. 2 discloses a pixel layout of a display panel
  • Fig. 3 discloses a pixel layout of a display panel showing a circular unit cell
  • Fig. 4 discloses the pixel layout according to Figure 3 showing a plurality of circular unit cells
  • Fig. 5 discloses a schematic view of a projection type image display device according to a first embodiment of the invention
  • Fig. 6 discloses a schematic view of a driving unit according to a preferred embodiment of the present invention.
  • Fig. 7 discloses a schematic view of a projection type image display device according to a second embodiment of the invention
  • Fig. 8 discloses a schematic view of a projection type image display device according to a third embodiment of the present invention
  • Fig. 9 discloses an achromatic circular polarizing beam splitter according to the third embodiment of the invention according to Figure 8;
  • Fig. 10 discloses a schematic view of a projection type image display device according to a fourth embodiment of the present invention.
  • Fig. 11 discloses color filtering means comprising dichroic filters for filtering white light into red light, green light and blue light;
  • Fig. 12 discloses a schematic view of a projection type image display device showing an angular color splitting system comprising dichroic mirrors for splitting white light into red light, green light and blue light;
  • Fig. 13 discloses how pixels are moved over a rectangular unit cell
  • Fig. 14 discloses a driving unit according to another embodiment of the present invention.
  • Fig. 1 is a conceptual diagram showing a basic constitution of a projection type image display device according to a general embodiment of the present invention.
  • the projection type image display device mainly comprises a light source 1, such as e.g. a halogen lamp, a metal halide lamp, an ultrahigh pressure mercury-vapor lamp, or a similar lamp, from which a white light luminous flux is emitted.
  • the projection type image display device comprises a display panel 2 comprising light valves for optically modulating the luminous flux and thus producing an image comprising pixels.
  • the display panel may be of either a transmissive or a reflective type, such as a Liquid Crystal Display (LCD) or a Liquid crystal on Silicon display (LCoS).
  • the projection type image display device comprises scanning means which, in a preferred embodiment, is a scanning mirror 4 for scanning the pixels of the display 2.
  • a projection lens 3 is provided for magnifying and projecting the scanned modulated luminous flux on a projection screen (not shown).
  • Fig. 2 shows the pixel layout of such a display panel.
  • each individual pixel 5 is divided into three sub- pixels 5R, 5G, 5B, red, green and blue (RGB). That is to say, for each full color pixel 5, three distinct pixels 5R, 5G, 5B are employed.
  • These sub-pixels 5R, 5G, 5B are created by applying the color filters which only allow certain wavelengths of the light to pass through them while absorbing the rest.
  • the scanning mirror 4 is arranged to scan the individual color pixels 5R, 5G, 5B within a unit cell 6, shown in Fig. 3, having a predetermined shape and area size. In such a way, each color pixel 5R, 5G, 5B illuminates time-sequential multiple positions on the projected image.
  • the displayed image has full modulation depth at each pixel position in the projected image, provided that the display is scanned properly.
  • the reflective LCoS panels allows a faster switching time than the transmissive LCD panels and such higher refresh rates of the system to reduce visible display artifacts. In the preferred embodiment, shown in Figs.
  • each color pixel 5R, 5G, 5B is moved circularly across the image plane.
  • the mirror 4 is rotated at a constant speed.
  • TN Twisted Nematic
  • Ferro-Electric LCD effect If the used display is an LCD, the used effect may be a very thin Twisted Nematic (TN) layer or a Ferro-Electric LCD effect.
  • Fig. 5 illustrates a first embodiment of the present invention, where the scanning mirror 4 is a circular-shaped mirror that rotates on a shaft 7 driven by a driving unit 8, such as an electric motor.
  • the shaft 7 is almost but not quite perpendicular to the scanning mirror 4 in order to move each color pixel 5R, 5G, 5B across the image plane, as can be seen in Fig. 6.
  • the display panel 2 is of a transmissive type, such as an LCD panel.
  • a white light luminous flux emitted from the light source 1 passes through the absorption type color filter (not shown) and the display panel 2 comprising light valves, modulating the white light luminous flux into the three principal colors, red, green and blue, represented as pixels 5R, 5G, 5B.
  • the modulated color light from each pixel is reflected on the scanning mirror 4, which is rotated by the driving unit 8 and the shaft 7, and projected on a projection screen (not shown) through a projection lens 3 which is a projection-optical means.
  • Example 2 If the scan frequency is taken to be 50 Hz, the pixel may be refreshed at fixed time intervals, such that after 20 mS its first position is repeated. E.g.
  • the scan frequency is taken to be 25 Hz and the pixel may be refreshed at fixed time intervals, such that after 40 mS its first position is repeated.
  • the size of the scanned unit cells may be taken to be such that the scanned pixel does not intersect with any of the original pixel positions, which means that a maximum of locations is addressed with a minimum of pixels in the display panel. This requires different scan frequencies than in the examples above. However, the increment in resolution becomes the number of pixel addressings during one scan cycle. Also, the size of the scanned unit cells is optimized for maximum resolution and best fit with respect to a homogeneous screen illumination. Furthermore, the intensity of the pixel may be corrected during the scan to improve homogeneity of the image.
  • Fig. 7 illustrates a second embodiment of the present invention, where the scanning mirror 4 is the circular-shaped mirror that rotates on the shaft 7 driven by the driving unit 8.
  • the display panel 2 is of a reflective type, such as an LCoS panel.
  • a polarizing beam splitter (PBS) 9 is arranged to transmit incident light in a first polarization state and to reflect incident light in a second polarization state. The process until an image, such as a video image or data graphics, is magnified and projected on the projection screen in the second embodiment, shown in Fig. 7, is described below.
  • a white light luminous flux emitted from the light source 1 reaches the polarizing beam splitter (PBS) 9 arranged to transmit incident light in a first polarization state and to reflect incident light in a second polarization state.
  • the reflected light in the second polarization state is deviated towards the display panel 2, passes through the absorption type color filter (not shown) and is reflected on the display panel 2 comprising reflective light valves, whereby the white light luminous flux is modulated into the three principal colors, red, green and blue, represented as pixels 5R, 5G, 5B.
  • the modulated color light now in the first polarization state from each pixel is reflected, via the PBS 9 transmitting the modulated color light, on the scanning mirror 4, which is rotated by the driving unit 8 and the shaft 7, and projected on the projection screen (not shown) through the projection lens 3, which is a projection-optical means.
  • Fig. 8 illustrates a third embodiment of the present invention, where the scanning means is an achromatic PBS 10 instead of a normal scanning mirror.
  • the achromatic PBS rotates on the shaft 7 driven by the driving unit 8 in the same manner as the scanning mirror of the first and the second embodiment of the present invention.
  • the display panel 2 is of the reflective type, such as an LCoS panel.
  • the achromatic PBS 10 scans each pixel in the image plane and simultaneously acts as a PBS in front of the reflective display panel 2 to illuminate the display panel 2 and to analyze the reflected modulated light from the reflective display panel 2.
  • An extra quarter-wave film 11 is positioned in between the scanning achromatic PBS 10 and the reflective type display panel 2, because the reflective display panel 2 requires linearly polarized light.
  • an additional clean-up polarizer 12 blocking any light having an undesired polarization direction, is required between the achromatic PBS 10 and the projection lens 3.
  • the clean-up polarizer 12 is, for example, made of a stack of a quarter- wave film and a polarizer film of the linear absorption type.
  • the achromatic PBS 10 may be obtained by laminating a wired grid type of PBS plate 13 in between two achromatic quarter-wave plates 14a, 14b, shown in Fig. 9, such that the wired grid plate 13 operates for circularly polarized light.
  • a wired grid plate 13 can be obtained from Moxtek Corporation USA.
  • the projection image display device according to the third embodiment of the invention minimizes the back focal length of the projection lens 3 and thus decreases the cost of the projection lens 3, as the optical path of the light is folded. The process until an image, such as a video image or data graphics, is magnified and projected on the projection screen in the third embodiment, shown in Fig. 8, is described below.
  • a white light luminous flux emitted from the light source 1 passes through the achromatic PBS 10, through the extra quarter- wave film 11 in order to get linearly polarized light and through the absorption-type color filter (not shown) and is reflected on the display panel 2 comprising light valves of the reflective type.
  • the white light luminous flux is modulated into the three principal colors, red, green and blue, represented as pixels 5R, 5G, 5B.
  • the modulated color light from each pixel is reflected on the achromatic PBS
  • Fig. 10 illustrates a fourth embodiment of the present invention, where the scanning mirror 4 is the circular-shaped mirror that rotates on the shaft 7 driven by the driving unit 8.
  • the display panel 2 is of a reflective type, such as an LCoS panel and the PBS 9 is arranged to transmit incident light in a first polarization state and to reflect incident light in a second polarization state.
  • the projection image display device of the fourth embodiment further comprises a photon recycler 15 and a light focusing lens 16.
  • the photon recycler 15 is arranged to recycle the light that is bounced back from the reflective display panel 2 to the illumination system, showing dark pixels on the screen, and thus increasing the brightness in the white area of the projected image.
  • This embodiment of the invention is excellent for extreme miniaturized LCoS panels, where the active pixel area has become of the same order as the gaps in between the pixels. For this reason, this embodiment is perfect with required solutions for visible pixel gaps and/or reduced efficiency due to geometrical aperture at extreme miniaturization.
  • a white light luminous flux emitted from the light source 1 passes through the photon recycler 15 and the lens 16 and reaches the polarizing beam splitter 9 arranged to transmit incident light in a first polarization state and to reflect incident light in a second polarization state.
  • the reflected light in the second polarization state is deviated towards the display panel 2, passes through the absorption type color filter (not shown) and is reflected on the display panel 2 comprising reflective light valves, whereby the white light luminous flux is modulated into the three principal colors, red, green and blue, represented as pixels 5R, 5G, 5B.
  • the modulated color light now in the first polarization state from each pixel is reflected, via the PBS 9 transmitting the modulated color light, on the scanning mirror 4, which is rotated by the driving unit 8 and the shaft 7, and projected on the projection screen (not shown) through the projection lens 3, which is a projection-optical means.
  • one method of generating colors is by applying a mosaic color filter which allows certain wavelengths to pass through them while absorbing the rest and thus creating the desired colors.
  • the display panel is of the reflective type such as an LCoS panel, internal dichroic mirror-based color filter patterns are used. Such a color filter is shown in Fig. 11.
  • the white light luminous flux passes through a top glass plate 17 in a first polarization state and hits the dichroic filter pattern 18.
  • the R-field is arranged to allow red light to pass through while reflecting green and blue light
  • the G-field is arranged to allow green light to pass through while reflecting red and blue light
  • the B-field is arranged to allow blue light to pass through while reflecting red and green light.
  • the filtered color lights of red light, green light and blue light pass through a liquid crystal layer 21 and reflect on reflective pixel electrodes 19 and are thus modulated to a second polarization state.
  • the reflective pixel electrodes 19 are arranged on a semiconductor body 20 containing an active matrix drive.
  • the photon recycler 15 consists, for instance, of a rectangular glass pipe having a mirror on the entrance surface (lamp side). The light from the light source 1 enters the glass pipe 15 via a hole in the mirror on its entrance surface. Most of the light that bounced back from the display panel 2 into the photon recycler will hit the mirror on its entrance surface (lamp side) and as such will be bounced back via this mirror on the entrance surface to the display 2.
  • Fig. 12 illustrates still another embodiment for generating colors, in which an angular color splitting system is used.
  • the angular color splitting system comprises a set of three mirrors 22, two of which are dichroic mirrors, the first dichroic mirror reflecting red light and allowing green and blue light to pass, the second dichroic mirror reflecting green light and allowing blue light to pass and the third mirror reflecting the blue light.
  • the display panel 2 comprising transmissive light valves, is provided with microlenses arranged to focus the light in the corresponding pixels.
  • Fig. 13 illustrates how the pixel 5 is moved over the unit cell 23 according to another embodiment of the present invention, where the unit cell 23 is rectangular.
  • the scanning mirror 24 is moved around its center position 25 using transducers, one of which is horizontal 26 and one of which is vertical 27, at two edges on the mirror, which is shown in Fig. 14.
  • the transducers 26, 27 may be based on electro-magnetic coils (loudspeaker) or may use piezo-electric elements.
  • the transducers 26, 27 are more or less arranged to make the scanning mirror 24 vibrate, such that each pixel 5 is moved over the rectangular unit cell 23.
  • the person skilled in the art will realize that the pixels do not necessarily need to move over a circular or rectangular unit cell. Other geometries for unit cells are also possible, such as a quadratic unit cell.
  • a method of scanning an image of a projection image display device will be described hereinafter, wherein the display device comprises a light source for emitting a white light luminous flux in one direction, modulating means comprising light valves for modulating lights contained in luminous fluxes and thus producing an image comprising pixels, and projection-optical means for projecting said image on a screen, according to any one of the above described embodiments, and the method comprises the step of: providing scanning means for scanning said image such that each modulated pixel illuminates a multitude of positions within a unit cell having a predetermined area size.
  • the method further comprises the step of providing color filtering means for filtering the white light from said light source into three color lights of red light, green light and blue light, such that each pixel of the image represents either one of the colors red, green or blue.
  • the method comprises the step of providing moving means for rotating or vibrating said scanning means around its center causing each modulated pixel to illuminate a multitude of positions within the circular or rectangular unit cell.
  • the method further comprises the step of providing a polarizing beam splitter arranged to transmit incident light in a first polarization state and to reflect incident light in a second polarization state.
  • the method comprises the steps of providing color splitting means for splitting the white light from said light source into three color lights of red light, green light and blue light, such that each pixel of the image represents either one of the colors red, green or blue, which color splitting means comprise three dichroic mirrors having characteristics for selectively passing and selectively reflecting red light, green light or blue light.
  • the method comprises the steps of providing modulating means comprising transmissive or reflective light valves.
  • the method comprises the steps of providing scanning means comprising a scanning mirror or an achromatic circularly polarizing beam splitter arranged to act as a polarizing beam splitter in front of reflective light valve-based modulating means and thus arranged to illuminate the modulating means as well as to analyze the reflective light from the modulating means.
  • the achromatic circularly polarizing beam splitter comprises a Moxtek type of polarizing beam splitter which is sandwiched between two achromatic quarter-wave plates.
  • the method further comprises the steps of providing photon recycling means for recycling light which is bounced back from the modulating means to the illumination path.
  • a projection image display device and a method of scanning an image of a projection image display device has been described, where the resolution of the display panel is taken to be much lower than before because each pixel is imaged at multiple screen positions.
  • the approach according to the present invention is advantageous in comparison with the previously discussed prior-art approach, which requires two scanning mirrors, one of which operates with high speed scanning.
  • the modulating means according to the prior art need to modulate with pixel speed instead of frame speed.
  • the present invention eliminates these restrictions of such a prior-art approach by providing scanning means which scan the image in such a way that each pixel illuminates time- sequential multiple positions on the projected image.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Projection Apparatus (AREA)
  • Liquid Crystal (AREA)

Abstract

L'invention concerne le domaine des appareils de visualisation d'images par projection permettant de scanner une image, ainsi qu'un procédé de balayage d'images. Le dispositif selon l'invention comprend une source lumineuse (1) qui émet un flux de lumière blanche dans une direction. Des dispositifs de modulation (2) comportent des modulateurs de lumière qui modulent la lumière de flux lumineux et produisent ainsi une image contenant des pixels. Des dispositifs optiques de projection (3) servent à projeter l'image sur un écran. Le dispositif d'affichage d'images est en outre doté de dispositifs de balayage (4) conçus pour scanner une image de telle sorte que chaque pixel modulé éclaire une multitude de positions dans une cellule unité de taille de zone déterminée.
PCT/IB2003/006288 2003-01-16 2003-12-10 Procede et dispositif pour scanner une image dans un systeme de projection WO2004064408A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003288663A AU2003288663A1 (en) 2003-01-16 2003-12-10 Device and method of scanning an image in a projection system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP03100071 2003-01-16
EP03100071.4 2003-01-16

Publications (1)

Publication Number Publication Date
WO2004064408A1 true WO2004064408A1 (fr) 2004-07-29

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ID=32695649

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Application Number Title Priority Date Filing Date
PCT/IB2003/006288 WO2004064408A1 (fr) 2003-01-16 2003-12-10 Procede et dispositif pour scanner une image dans un systeme de projection

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AU (1) AU2003288663A1 (fr)
WO (1) WO2004064408A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0392256A2 (fr) * 1989-04-10 1990-10-17 NILFORD LABORATORIES, INC., doing business as AMTEL VIDEO Balayage d'un système d'affichage d'image
US5300942A (en) * 1987-12-31 1994-04-05 Projectavision Incorporated High efficiency light valve projection system with decreased perception of spaces between pixels and/or hines
US5402184A (en) * 1993-03-02 1995-03-28 North American Philips Corporation Projection system having image oscillation
US6088102A (en) * 1997-10-31 2000-07-11 Silicon Light Machines Display apparatus including grating light-valve array and interferometric optical system
US20010024326A1 (en) * 2000-03-16 2001-09-27 Olympus Optical Co., Ltd. Image display device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5300942A (en) * 1987-12-31 1994-04-05 Projectavision Incorporated High efficiency light valve projection system with decreased perception of spaces between pixels and/or hines
EP0392256A2 (fr) * 1989-04-10 1990-10-17 NILFORD LABORATORIES, INC., doing business as AMTEL VIDEO Balayage d'un système d'affichage d'image
US5402184A (en) * 1993-03-02 1995-03-28 North American Philips Corporation Projection system having image oscillation
US6088102A (en) * 1997-10-31 2000-07-11 Silicon Light Machines Display apparatus including grating light-valve array and interferometric optical system
US20010024326A1 (en) * 2000-03-16 2001-09-27 Olympus Optical Co., Ltd. Image display device

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Publication number Publication date
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