U.S. Philips Corporation

Jacobus H Neijzen

Hugo Johan Cornelissen

Adrianus J De Vaan

Martinus V Stroomer

Johannes Johanna Van Herk

Willem L Van Der Sluijs

Anthonie H Bergman

Petrus W De Roo

The invention relates to a reflective flat-panel display device (1) comprising a display panel (3) which is suitable for modulating an illumination beam with image information. The display panel (3) comprises a diffusing liquid crystalline material (5) and a first and a second substrate (7, 9) enclosing the liquid crystalline material (5) and reflecting means which reflect light incident at an angle which is larger than a given angle of incidence .theta..sub.c. The device further includes an absorbing element (10) which absorbs light passed by the reflecting means.

Reflection type diffusing liquid crystal display with selective

Display device (1) comprising an illumination system (3) having a radiation source (17; 31, 35) for supplying a radiation beam. The display device (1) also comprises a diffusing display panel (5). This panel (5) consists of an optically active diffusing medium (7) which is switchable between a transparent, polarization-maintaining state and a diffusing, depolarizing state for the radiation beam. The medium (7) is present between a first polarizer (9) having a first state of polarization and a second polarizer (11) having a second, complementary state of polarization. At least the first polarizer (9) is a reflecting polarizer and polarization-converting means (10) are arranged at a side of the first polarizer (9) facing away from the display panel (5).

Display device having a diffusing display panel and a reflecting

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&lt;&lt;m,n and p.sub.1 &gt;&gt;p.sub.m, p.sub.p.

Picture display device

Picture display device (1) comprising an illumination system (3) and a picture display panel (7) which is provided with a matrix of pixels. The picture display panel (7) may be a transmissive or a reflective picture display panel. In the case of a transmissive picture display panel, a first microlens array (19) is arranged at the illumination side of the picture display panel (7), and a second microlens array (21) is arranged at the side of the picture display panel (7) remote from the illumination system (3). In the case of a reflective picture display panel, the picture display device (1) comprises only one microlens array (61) which is arranged between the illumination system (3) and the picture display panel (7). In both cases, the number of lenses (23, 25; 63) of a microlens array (19, 21; 61) corresponds to the number of pixels (27) of the picture display panel (7). A beam-refracting element (37, 39; 67), by means of which a beam waist is realized at the area of the picture display panel (7), corresponds to each lens (23, 25; 63) of a microlens array (19, 21; 61).

Picture display device with microlens array and beam refracting element

A food processor is provided having a motor (18), a bowl (10) and a beater (12) which are movable relative to each other by a drive by the motor (18), a switching means (48) for switching the motor (18) on and off under the control of a start signal (START) and at least a first stop signal (STOP1) respectively, torsion measuring means (28/30, 32/34) for producing a torsion signal (TS) which is a measure for the torque necessary for the drive, a signal processing unit (42) for producing at least the first stop signal (STOP1) in response to the torsion signal (TS). The signal processing unit (42) includes a first differentiator (56) and/or a second differentiator (58) for producing the first (DTS) and the second derivative (DDTS) of the torsion signal (TS) and a comparator (62) in which the first (DTS) or second (DDTS) derivative is compared with a reference value (REF1). When the reference value is exceeded, the comparator produces a stop signal (STOP1) to switch off the motor (18). The food processor stops by itself once a predetermined bending point in the torsion signal (TS) occurs, so that it becomes possible to whip cream of varying quantity, quality and composition without supervision.

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Eindhoven, Netherlands

Jacobus H Neijzen