WO2005091646A1 - Element optique transmissif tournant et systeme d'affichage en couleur l'utilisant - Google Patents

Element optique transmissif tournant et systeme d'affichage en couleur l'utilisant Download PDF

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Publication number
WO2005091646A1
WO2005091646A1 PCT/IB2005/050882 IB2005050882W WO2005091646A1 WO 2005091646 A1 WO2005091646 A1 WO 2005091646A1 IB 2005050882 W IB2005050882 W IB 2005050882W WO 2005091646 A1 WO2005091646 A1 WO 2005091646A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical element
element according
color
filters
display system
Prior art date
Application number
PCT/IB2005/050882
Other languages
English (en)
Inventor
Robertus J. Heeman
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.
Publication of WO2005091646A1 publication Critical patent/WO2005091646A1/fr

Links

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]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/007—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light
    • G02B26/008—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light in the form of devices for effecting sequential colour changes, e.g. colour wheels
    • 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
    • H04N9/3114—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 one colour at a time
    • 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
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/006—Filter holders

Definitions

  • the present invention relates to a scrolling color display system comprising a light source and a color scanner for generating a light beam with a plurality of scrolling color fields, which beam is arranged to illuminate a light modulator to produce an image generated by the light modulator.
  • the invention also relates to a rotatable transmissive element intended for use in such a system.
  • Such a scrolling color display system is disclosed in e.g. US 5,532,763, and is particular in that light from a light source is divided into a plurality of beams (typically three; red, blue and green), which are sequentially scrolled over a display device, e.g., a reflective LCD, and then projected by means of a lens.
  • the bars are scrolled, e.g., from top to bottom, and are synchronized with the display so that they complete a scrolling sequence within one picture frame.
  • An improved display system was disclosed in US 6,361,172, according to which the scanner is a rotating transmissive element in the form of a rotating drum having transmissive surface portions in the form of filters with different transmission bands.
  • the surface portions opposite each filter can either be filters of the same color, or just clear portions.
  • the drum rotates it will sequentially filter an incident light beam into the different colors.
  • multiple (more than three) primary colors has been introduced in the field of scrolling color display systems, and drums of the mentioned type have been found suitable for implementing such projection systems.
  • a problem with any optical element used as a scanner to generate a plurality of primary colors, is that the filters, especially the green filter which is a band-pass filter, are expensive. This, of course, is particularly a problem in systems with more than three primary colors, where the number of different components becomes relatively large.
  • An object of the present invention is to mitigate this problem, and provide an optical element capable of generating multiple primary colors, which is more cost efficient to manufacture.
  • a first aspect of the invention relates to a rotatable optical element for use in a scrolling color display system, the optical element being arranged to provide, when rotated, varying color filtering of incident light.
  • the element has at least one position in which incident light will pass two different color filters, in combination forming a third filter.
  • the two color filters with different properties are single sided cutoff filters, in combination forming a band pass filter.
  • the optical element can further comprise at least one drum having a plurality of pairs of oppositely located surface portions, arranged so that light incident on the drum will pass both surface portions in a pair, at least one of the surface portions in each pair being provided with a color filter.
  • Such rotating drums have been found advantageous in color scrolling display systems.
  • the two different filters can be arranged on oppositely located surface portions of a single drum, or be arranged on opposite sides of one surface portion.
  • the optical element can comprises two or more drums.
  • a lens can be arranged coaxially inside the drum(s) for focusing light passing through one surface portion of a drum onto another surface portion of the drum.
  • the optical element can comprise at least one disc having a plurality of sectors provided with color filters.
  • This type of optical element may also be advantageous in a scrolling color display system.
  • the two different color filters can be arranged on opposite sides of one such disc, or be arranged on separate discs.
  • a lens can be arranged to focus light passing through the first disc onto the second disc.
  • a second aspect of the invention relates to a color display system comprising a light source and a color scanner for generating a light beam with sequentially varying color, which beam is arranged to illuminate a light modulator, thereby generating an image, wherein the scanner is an optical element according to the first aspect of the invention.
  • the display system can be a projection system, further comprising means for projecting the image onto an image surface.
  • the projecting means can be arranged behind the image surface compared to a viewer (rear projection), or arranged in front of the image surface compared to a viewer (front projection).
  • the display system is a direct view system, i.e. the light modulator acts as a viewing screen.
  • Fig 1 is a schematic view of a color projection scanner according to an embodiment of the present invention.
  • Fig 2 is a perspective view of a first embodiment of the optical element in fig 1.
  • Fig 3 is a schematic plane view of a first alternative of the optical element in fig 2.
  • Fig 4 is a schematic plane view of a second alternative of the optical element in fig 2.
  • Fig 5 is a schematic plane view of a second embodiment of the optical element in fig 1.
  • Fig 6 is a perspective view of a third embodiment of the optical element in fig
  • Fig 7 and 8 are schematic plane views of a fourth embodiment of the optical element in fig 1.
  • the present invention can advantageously be used in a projection system of the kind illustrated in fig 1.
  • the system comprises an display driver 1, arranged to receive a data input stream 2, from e.g. a personal computer or a video cassette recorder (not shown), and to drive a light modulator 3, such as a reflective LCD.
  • a light source 4 preferably a UHP lamp followed by an integrator, is controlled by a lamp driver 5 to generate a light beam 6a.
  • the beam is imaged by a first lens 7 onto a rotatable optical element 8, which converts the light beam 6a from the lamp 4 into a colored light beam 6b shifting color as the optical element 8 rotates.
  • the optical element generates five primary colors (red, green, blue, cyan and yellow) one after the other.
  • the beam 6b is focused by a second lens 9 into a polarizing beam splitter (PBS) 10 and further onto the light modulator 3.
  • PBS polarizing beam splitter
  • the fields of the beam 6b are brought to continuously scroll across the display device, to sequentially illuminate the display device with the different primary colors.
  • An image generated by the by the light modulator 3 is reflected back into the PBS 10, which directs the reflected image to a projection lens 11, for projection onto a suitable screen (not shown).
  • the projection lens can be arranged behind the screen as seen from a viewer (rear projection) or in front of the screen (front projection).
  • the invention is not limited to use in a projection display system. On the contrary, it may advantageously be used in many display system, such as a direct view system.
  • the light modulator 3 can be a larger, transmissive LCD, arranged at a larger distance from the optical element, by itself acting as the display screen.
  • a first embodiment of the optical element 8, is shown in more detail in fig 2, and comprises a drum 12 surrounding a cylindrical lens 13, coaxial with the drum.
  • the drum has a plurality of pairs of oppositely located surface portions, typically one pair for each primary color used by the display system. With five primary colors (red, green, blue, cyan and yellow), as in this case, the drum is decagon, i.e. a polygon with ten sides.
  • Each surface portions can be formed by a transmissive substrate, and at least some surface portions are provided with color filters.
  • Figs 3 and 4 show how a beam of incident light 6a is focused by lens 7 onto a surface portion 16a; 18a of the drum 12, then is focused by the lens 13 onto the opposite surface portion 16b; 17b, and finally is refocused by the lens 9.
  • two opposite surface portions 16a, 16b are provided with different color filters 17a, 17b, in combination realizing a third color filter.
  • the drum 6 may have four pairs of opposite surface portions 14a, 14b, each pair provided with two color filters 15a, 15b of the same color (i.e. red, blue, cyan and yellow) filters respectively.
  • one of the surface portions e.g.
  • each of these four pairs may instead be clear (i.e. without filter) (see fig 4).
  • the surface portions 16a, 16b of the fifth pair are provided with two different color filters, here single sided cut-off filters (e.g. yellow and cyan), so that a third filter is formed, here a green band-pass filter. Note that the thickness of the filters in fig 3 (as well as in the following figures) for reasons of clarity has been exaggerated compared to the thickness of the substrate.
  • one surface portion 18a is provided with two different filters 19a, 19b.
  • the drum may have four pairs of opposite surface portions 14a, 14b, each pair comprising one clear section 14b (i.e. without filter), and one section 14a provided with a color filter 15a (i.e. red, blue, cyan and yellow).
  • both surface portions in each pair can also be provided with identical filters (see fig 3).
  • the fifth pair comprises one clear surface portion 18b (i.e. without filter), and one surface portion 18a provided with two different color filters 19a, 19b, e.g. one yellow and one cyan. These two filters can be arranged on opposite sides of the transmissive substrate forming the surface portion 18a.
  • the optical element 8 comprises two drums 21, 22, similar to the one in fig 3, which are arranged coaxially around a central lens 23.
  • the drums may be rotated together or separately.
  • incident light 6a will pass through four surface portions 24a, 24b, 24c, 24d, and the drums are arranged and rotated in such a way that for at least one position of the drums 21, 22, two of these four surface portions will be provided with filters 25a, 25b with different properties, e.g. a yellow and a cyan filter as mentioned above.
  • filters 25a, 25b with different properties e.g. a yellow and a cyan filter as mentioned above.
  • the optical element 8 has the form of a rotatable disc 31 , comprising a transmissive substrate 32, e.g. made of glass, provided on one side with a plurality of sector shaped filters 33, 34a. On the other side of the substrate 32 is arranged at least one additional filters 34b, so that the disc in this sector presents incident light with two different filters, 34a and 34b.
  • a fourth embodiment shown in figs 7 and 8, two discs 31a, 31b similar to the one in fig 6 are arranged coaxially, one after the other. The discs can be rotated together or separately.
  • the discs 31a, 3 lb are arranged and rotated in a way so that for at least one position of the discs, incident light will pass through two different filters 35a, 35b.
  • the discs are arranged close enough to each other to eliminate the need of any additional focusing element.
  • the discs are arranged at such a distance from each other that a focusing element, e.g. a lens 36, is required to focus light passing through the first disc onto the second.
  • Measured spectral data of currently used filters in a five color drum show that the 50% points of the filter edges of the yellow and cyan filters are approximately at the same wavelength resulting in transition widths approximately as wide as the green band pass filter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Projection Apparatus (AREA)

Abstract

L'invention porte sur un élément optique transmissif tournant utilisé dans un système d'affichage déroulant et fournissant lors de sa rotation différentes filtrage de couleur de la lumière incidente. Ledit élément optique comprend au moins une position où la lumière incidente traverse deux filtres de couleur différente qui combinés en forment un troisième. Cette substitution d'au moins un filtre de couleur par une combinaison de deux autres filtres permet de réduire le nombre des composants différents de l'élément optique. L'invention porte également sur un système d'affichage utilisant un tel élément optique.
PCT/IB2005/050882 2004-03-19 2005-03-11 Element optique transmissif tournant et systeme d'affichage en couleur l'utilisant WO2005091646A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP04101134 2004-03-19
EP04101134.7 2004-03-19

Publications (1)

Publication Number Publication Date
WO2005091646A1 true WO2005091646A1 (fr) 2005-09-29

Family

ID=34961183

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2005/050882 WO2005091646A1 (fr) 2004-03-19 2005-03-11 Element optique transmissif tournant et systeme d'affichage en couleur l'utilisant

Country Status (1)

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WO (1) WO2005091646A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007047463A1 (de) * 2007-09-28 2009-04-02 Carl Zeiss Meditec Ag Vorrichtung zum Wechseln optischer Elemente in Strahlengängen
CN102445829A (zh) * 2010-08-19 2012-05-09 株式会社理光 光源单元、照明设备及投影显示装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0248974A2 (fr) * 1986-05-15 1987-12-16 VARI-LITE, INC.(a Delaware corporation) Dispositif à disques colorés pour installation d'éclairage
JP2001105659A (ja) * 1999-10-07 2001-04-17 Fuji Photo Film Co Ltd 光学式プリンタ及びプリント方法
US6361172B1 (en) * 2000-03-20 2002-03-26 Philips Electronics North America Corporation Color projection system incorporating electro-optic light modulator and rotating light-transmissive element
US20020109821A1 (en) * 2001-02-09 2002-08-15 Reflectivity, Inc., A California Corporation Projection display with multiply filtered light
US20030035290A1 (en) * 1991-04-30 2003-02-20 Bornhorst James M. High intensity lighting projectors

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0248974A2 (fr) * 1986-05-15 1987-12-16 VARI-LITE, INC.(a Delaware corporation) Dispositif à disques colorés pour installation d'éclairage
US20030035290A1 (en) * 1991-04-30 2003-02-20 Bornhorst James M. High intensity lighting projectors
JP2001105659A (ja) * 1999-10-07 2001-04-17 Fuji Photo Film Co Ltd 光学式プリンタ及びプリント方法
US6710796B1 (en) * 1999-10-07 2004-03-23 Fuji Photo Film Co., Ltd. Optical printer with color filter and optical printing method
US6361172B1 (en) * 2000-03-20 2002-03-26 Philips Electronics North America Corporation Color projection system incorporating electro-optic light modulator and rotating light-transmissive element
US20020109821A1 (en) * 2001-02-09 2002-08-15 Reflectivity, Inc., A California Corporation Projection display with multiply filtered light

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 21 3 August 2001 (2001-08-03) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007047463A1 (de) * 2007-09-28 2009-04-02 Carl Zeiss Meditec Ag Vorrichtung zum Wechseln optischer Elemente in Strahlengängen
DE102007047463B4 (de) * 2007-09-28 2017-12-07 Carl Zeiss Meditec Ag Vorrichtung zum Wechseln optischer Elemente in Strahlengängen
CN102445829A (zh) * 2010-08-19 2012-05-09 株式会社理光 光源单元、照明设备及投影显示装置

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