Abstract: An electronic window (20) employs a rear projection screen, a rear projection engine (21), and a solar simulator (22). Rear projection engine (21) is positioned at a first location relative to the rear projection screen wherein rear projection engine (21) is operated to project an image onto the rear projection screen. Solar simulator (22) is positioned at a second location relative to the rear projection screen wherein solar simulator (22) is operated to simulate a sunbeam shining through the rear projection screen.

Abstract: A display device including a plurality of image projection devices and a display. The display device provides received content to the display and provides image signals to the plurality of image projection devices. In response to the provided image signals, the plurality of image projection devices project images on an area of a display surface that is separate from the display. A plurality of image capture devices positioned around the display device operate during a calibration and/or alignment procedure of the plurality of image projection devices to calibrate and/or align the projected images.

Abstract: The present invention relates to a method of generating an image having a desired brightness, which image is generated by means of a device provided with at least one light source, at least one electro-optical light modulation panel and at least one light-control device. The light from the light source is converted into an image having a desired brightness via at least the electro-optical light modulation panel and the light-control device. The image to be projected is analyzed in a regulator, whereafter the electro-optical light modulation panel and the light-control device are driven, while a too bright image is generated by means of the electro-optical light modulation panel, which image is converted by means of the light-control device into an image having a desired brightness and a desired contrast.

Abstract: The present invention relates to a method of generating an image having a desired brightness, which image is generated by means of a device provided with at least one light source, at least one electro-optical light modulation panel and at least one light-control device. The light from the light source is converted into an image having a desired brightness via at least the electro-optical light modulation panel and the light-control device. The image to be projected is analyzed in a regulator, whereafter the electro-optical light modulation panel and the light-control device are driven, while a too bright image is generated by means of the electro-optical light modulation panel, which image is converted by means of the light-control device into an image having a desired brightness and a desired contrast.

Abstract: The present invention relates to a method of generating an image having a desired brightness, which image is generated by means of a device provided with at least one light source, at least one electro-optical light modulation panel and at least one light-control device. The light from the light source is converted into an image having a desired brightness via at least the electro-optical light modulation panel and the light-control device. The image to be projected is analyzed in a regulator, whereafter the electro-optical light modulation panel and the light-control device are driven, while a too bright image is generated by means of the electro-optical light modulation panel, which image is converted by means of the light-control device into an image having a desired brightness and a desired contrast.

Abstract: The present invention relates to a method of generating an image having a desired brightness, which image is generated by means of a device provided with at least one light source, at least one electro-optical light modulation panel and at least one light-control device. The light from the light source is converted into an image having a desired brightness via at least the electro-optical light modulation panel and the light-control device. The image to be projected is analyzed in a regulator, whereafter the electro-optical light modulation panel and the light-control device are driven, while a too bright image is generated by means of the electro-optical light modulation panel, which image is converted by means of the light-control device into an image having a desired brightness and a desired contrast.

Abstract: The present invention relates to an image projection system (1). The system (1) comprises an illumination system (3) with a light source (5) for supplying an illumination beam. The system (1) also comprises a modulation system (11) with at least one reflecting image display panel (13, 15, 17) for modulating this light beam in conformity with image information to be projected, and a projection lens system (12) for projecting this image information. A color-separating system (19) is arranged between the modulation system (11) and the illumination system (3), and a polarizing beam splitter (9) is arranged between the color-separating system (19) and the illumination system. The reflective display panel is a liquid crystalline display panel of the diffusing type, and a &lgr;/4 plate (35, 37, 39) is arranged between the reflective portions of the pixels of the display panel and the polarizing beam splitter.

Abstract: The invention relates to an image projection system (1). The system comprises an illumination system (3) with a radiation source (5) and a modulation system comprising at least one reflective image display panel (15). The system (1) further comprises a projection lens system (18). A polarization-sensitive beam splitter (17) is arranged between the illumination system (3) and the image display panel (15). The illumination system (3) comprises an integrator system (9) having a first and a second integrator plate (11, 13). A third integrator plate (27) is arranged in the plane of the second integrator plate (13). A reflecting element (29) is arranged between the third integrator plate and its focal plane. The system comprises an optical system for imaging, at least partly, the reflected image of the second integrator plate on the third integrator plate.

Abstract: The invention relates to an image projection module (1) comprising, in this order, an illumination system (3) and an image display system (13) having at least one display panel (15) for modulating an illumination beam to be supplied by the illumination system (3) with image information. The illumination system (3) comprises an integrator system (19) having an exit surface which is located in an exit plane. First reflecting means (33; 43) are present in the exit plane of the integrator system (19) and the module (1) further comprises second, selectively reflecting means (39). An optical system (31) for at least partly imaging the exit surface via the second reflecting means on the first reflecting means is arranged between the first and the second reflecting means.

Abstract: The invention relates to an illumination system (1) comprising, in this order, a radiation source (5) and an integrator system (11). First reflecting means are present in the exit plane (25) of the integrator system (11) and second reflecting means in the form of a reflective polarizer (29) are further present in the illumination system (1). An optical system (23) for at least partly imaging the exit surface of the integrator system (11) via the second reflecting means on the first reflecting means is present between the first reflecting means and the second reflecting means. Moreover, polarization-converting means are present between the first and the second reflecting means.The invention also relates to an image projection device and to a presentation system provided with such an illumination system.

Abstract: The illumination system (21) includes two radiation sources (23, 25) and an optical system for concentrating the radiation into beams, a common polarizing system (11) for splitting the beams (b.sub.I, b.sub.II) into linearly polarized sub-beams, and at least one polarization-rotating element (35). The polarizing system includes at least one optically transparent plate (11) having a refractive index n.sub.0 and a first face and a second face. At least one of these faces is provided with an optically thin layer having a refractive index n.sub.1 which is larger than n.sub.0. The light path of the sub-beams whose directions of polarizations are not to be converted incorporates a reflector (41, 43) for reflecting the sub-beams into the same direction of propagation as that of the other sub-beams.

Abstract: A projection beam supplied by a projector is incident on a beam splitter in the form of a cholesteric filter. The cholesteric filter reflects circularly polarized radiation having a wavelength which corresponds to the pitch of the molecular helix and having a direction of rotation which corresponds to the direction of the molecular helix to a reflector. The circular direction of polarization reflected by the cholesteric filter is inverted on the reflector so that the beam is subsequently passed to the screen by the cholesteric filter.

Abstract: Picture display device (1) comprising an illumination system (3) provided with a light source (5) for generating a light beam. The device (1) also comprises a picture display panel (9) having a matrix of pixels (10) for modulating said light beam in conformity with picture information to be displayed. A first microlens array (13) having a plurality of first lenses (15) and a pitch .DELTA.w.sub.1 is present between the illumination system (3) and the picture display panel 9. A second microlens array (17) having a plurality of second lenses (19) and a pitch .DELTA.w.sub.2 is present between the first microlens array (13) and the picture display panel (9). The focal planes of the two microlens arrays coincide and .DELTA.w.sub.1 =.DELTA.w.sub.2 =.DELTA..sub.w applies to the pitches. The first lenses (15) have dimensions which are substantially equal to the dimensions of the second lenses (19).

Abstract: A picture display device is disclosed having an illumination system and a picture display panel which is provided with a matrix of n panels and has a pitch p.sub.p. The device further has a projection lens system for projecting light modulated by the picture display panel to form an image. The illumination side of the picture display panel is provided with a microlens array having m microlenses and a pitch p.sub.m. The illumination system includes N illumination elements which are arranged in an array and have pitch p.sub.1. The illumination elements generate light simultaneously. Moreover, N<<m,n and p.sub.1 >>p.sub.m, p.sub.p.

Abstract: An illumination system comprising a reflector, a cholesteric filter and a depolarizer. The cholesteric filter is arranged between a radiation source and, in a display device, a display panel, and is selected to transmit radiation having a selected state of polarization in a selected wavelength range, while reflecting otherwise polarized radiation in that wavelength range. The depolarizer is disposed between the reflector and the cholesteric filter. Radiation reflected by the cholesteric filter is re-reflected to the filter by the reflector and, having been depolarized in the depolarizer, is transmitted to the extent it has the selected state of polarization in the selected wavelength.

Abstract: A compact and efficient image projection system is described. The projection beam supplied by a projector is incident on a beam splitter in the form of a cholesteric filter. The cholesteric filter reflects circularly polarized radiation having a wavelength which corresponds to the pitch of the molecular helix and having a direction of rotation which corresponds to the direction of the molecular helix to a reflector. The circular direction of polarization reflected by the cholesteric filter is inverted on the reflector so that the beam is subsequently passed to the screen by the cholesteric filter.

Abstract: A reflecting image projection screen (1) is described, as well as an image projection system (17) in which such a projection screen (1) is used. Viewed from the front side (3) of the projection screen (1), the image projection screen comprises, in this order, a linear polarizer (9), a .lambda./4 plate (11), a reflecting polarizer (13) in the form of a cholesteric filter and a reflecting layer (15) which is also active as a depolarizing diffuser layer. By combining a cholesteric filter (13) with a depolarizing reflecting layer (15), an image projection screen is obtained which is highly reflective to the direction of polarization supplied by the image projector (19) and substantially absorbs the other direction of polarization.

Abstract: An image projection arrangement is disclosed, comprising a radiation source (1), an image display system having at least one image display panel (10) in which the polarisation direction of an incident beam is modulated with the image information, and a polarisation-sensitive beam splitter (2), arranged between the source and the image display system, for forming two mutually perpendicularly polarised sub-beams (b.sub.1, b.sub.2). By having the two sub-beams be modulated by the same image display system (10) and by thereafter combining these sub-beams again a very efficient use can be made of the available light without the necessity of a significant more complex design of the arrangement.

Abstract: An image projection apparatus is described, which comprises an illumination system (100, 101, 54, 57, 62) having a first, round lens plate (54) and a second, half-round lens plate (57). A combination of a special polarization-sensitive beam splitter (20) and a polarization rotator (31) is arranged in the path of the beam supplied by this system and converts the beam into two sub-beams having the same state of polarization which jointly illuminate a display panel (1) in a uniform manner and optimally fill the surface area of this panel and a subsequent projection lens system (C).

Abstract: The present invention relates to a method of generating an image having a desired brightness, which image is generated by means of a device provided with at least one light source, at least one electro-optical light modulation panel and at least one light-control device. The light from the light source is converted into an image having a desired brightness via at least the electro-optical light modulation panel and the light-control device. The image to be projected is analyzed in a regulator, whereafter the electro-optical light modulation panel and the light-control device are driven, while a too bright image is generated by means of the electro-optical light modulation panel, which image is converted by means of the light-control device into an image having a desired brightness and a desired contrast.