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Driver for vf displays
Increased area for Icds
Projection colour tv
Liquid crystal displayproduction will benefit from Hamlin's purchase of 2000 m 2 of factory space in the USA. The move will be of particular value to their increasing large area custombuilt display production. These displays are intended for applications such as petrol pumps, weighbridges, pipeline meters, agricultural equipment and in marine electronics.
A projection tv system has been introduced by Mullard. Known as Empress III, it is a low-cost approach to large-screen colour tv. It offers matched components for an optimized f/0.7 super Schmidt system displayed in reflective mode.
Ham/in Electronics Europe Ltd, Diss, Norfolk IP22 3A Y, UK
Driver for vf displays A vacuum fluorescent display driver has been introduced, designed for use with National's family of microcontrollers. Designated the COP 470, the device drives a multiplexed four digit, eight segment vf display directly and without additional logic. Two of the units can be stacked to drive an eight digit multiplexed display, or a sixteen segment display. By using more drivers, both the digits and the segments can be simultaneously expanded. Besides offering display size flexibility, the unit can also vary display brightness, under software control.
National Semiconductor (UK) Limited, 301 Harpur Centre, Home Lane, Bedford, UK
• . . and Ic displays A range of display drivers designed to receive input signals from the output port of a microcomputer has been announced by OKI Electric Industries and will be available through their UK Representatives, CRP Electronics Ltd. The devices in the range are designed to drive 4 digit vacuum fluorescent displays and 5 digit Icd and vfd panels.
CRP Electronics Ltd, 13 Haze/bury Crescent, Luton LU1 1DF, UK
226
Flexibility is a key feature of the design. In principle the system can be used with flat or curved viewing screens of various sizes, two-piece or one-piece folded system, front or rear projection and floor or ceiling mounting. The range of associated components includes a 75 mm diameter red, green and blue 500 line crt, primary spherical mirror, aspheric corrector lens, deflection coil and integral housing.
Mullard Ltd, Mullard House, Torrington Place, London WCI E 7HD, UK
Improve your image One application of Gems, an image processing system developed by the Computer Aided Design Centre, will be in the field of ophthalmology. The Institute of Ophthalmology plans to use the system to investigate tunnel vision. In retinitis pigmentosa, as the condition is more formally known, the loss of vision appears to be caused by a decrease in the amount of visual pigment in the rod cells of the eye. Measurement of pigment levels in the living eye is therefore clearly of fundamental" importance to research into this disease. Use of the Gems image processor means that the pigment level can be studied with relatively little light entering the eye. Previously, the high light levels needed bleached the pigment causing it to disappear from view. The use of a photomultiplier technique eliminates these difficulties
and means that the eye can be viewed continuously while measurements and compensations are being made. Gems incorporates recursive filtering and averaging which clean up blurred or noisy images at up to tv line rate. The basic memory module will hold a picture of 512 lines of 1 024 points each, and is extendible. Each point comprises eight bits with one additional bit for an overlay allowing pictures to be annotated. Thus a total memory of 1024 x 1024 x (32 + 4)is possible by using eight basic modules, and the system's large cabinet allows installation of these additional units. The processor is intended for use in research and inspection applications and for enhancing images such as satellite pictures. A number of units have been sold: to the Institute of Ophthalmology mentioned above, the Royal Aircraft Establishment, the Post Office Research Centre, and Universities.
Computer Aided Design Centre, Madingley Road, Cambridge CB3 OHB, UK
Two in one A seven-segment led display with a grey-coloured surface is available from Siemens as a twin-colour display. It is initially available only in a 10 mm character height version. Each illuminated segment of this display is equipped with two anti-parallel semiconductor chips. Changing the emission colour from red to green and vice versa follows via simple changing of the polarity of the operating voltage/ current: the chip which lies in the forward direction is illuminated. The ability of the display to present information is greatly enhanced by the introduction of 'reversible' colours. Digitally displayed values can be presented in two colours. Changing from green to red can serve as a warning
DISPLAYS. APRIL 1981
Projection colour tv
Liquid crystal displayproduction will benefit from Hamlin's purchase of 2000 m 2 of factory space in the USA. The move will be of particular value to their increasing large area custombuilt display production. These displays are intended for applications such as petrol pumps, weighbridges, pipeline meters, agricultural equipment and in marine electronics.
A projection tv system has been introduced by Mullard. Known as Empress III, it is a low-cost approach to large-screen colour tv. It offers matched components for an optimized f/0.7 super Schmidt system displayed in reflective mode.
Ham/in Electronics Europe Ltd, Diss, Norfolk IP22 3A Y, UK
Driver for vf displays A vacuum fluorescent display driver has been introduced, designed for use with National's family of microcontrollers. Designated the COP 470, the device drives a multiplexed four digit, eight segment vf display directly and without additional logic. Two of the units can be stacked to drive an eight digit multiplexed display, or a sixteen segment display. By using more drivers, both the digits and the segments can be simultaneously expanded. Besides offering display size flexibility, the unit can also vary display brightness, under software control.
National Semiconductor (UK) Limited, 301 Harpur Centre, Home Lane, Bedford, UK
• . . and Ic displays A range of display drivers designed to receive input signals from the output port of a microcomputer has been announced by OKI Electric Industries and will be available through their UK Representatives, CRP Electronics Ltd. The devices in the range are designed to drive 4 digit vacuum fluorescent displays and 5 digit Icd and vfd panels.
CRP Electronics Ltd, 13 Haze/bury Crescent, Luton LU1 1DF, UK
226
Flexibility is a key feature of the design. In principle the system can be used with flat or curved viewing screens of various sizes, two-piece or one-piece folded system, front or rear projection and floor or ceiling mounting. The range of associated components includes a 75 mm diameter red, green and blue 500 line crt, primary spherical mirror, aspheric corrector lens, deflection coil and integral housing.
Mullard Ltd, Mullard House, Torrington Place, London WCI E 7HD, UK
Improve your image One application of Gems, an image processing system developed by the Computer Aided Design Centre, will be in the field of ophthalmology. The Institute of Ophthalmology plans to use the system to investigate tunnel vision. In retinitis pigmentosa, as the condition is more formally known, the loss of vision appears to be caused by a decrease in the amount of visual pigment in the rod cells of the eye. Measurement of pigment levels in the living eye is therefore clearly of fundamental" importance to research into this disease. Use of the Gems image processor means that the pigment level can be studied with relatively little light entering the eye. Previously, the high light levels needed bleached the pigment causing it to disappear from view. The use of a photomultiplier technique eliminates these difficulties
and means that the eye can be viewed continuously while measurements and compensations are being made. Gems incorporates recursive filtering and averaging which clean up blurred or noisy images at up to tv line rate. The basic memory module will hold a picture of 512 lines of 1 024 points each, and is extendible. Each point comprises eight bits with one additional bit for an overlay allowing pictures to be annotated. Thus a total memory of 1024 x 1024 x (32 + 4)is possible by using eight basic modules, and the system's large cabinet allows installation of these additional units. The processor is intended for use in research and inspection applications and for enhancing images such as satellite pictures. A number of units have been sold: to the Institute of Ophthalmology mentioned above, the Royal Aircraft Establishment, the Post Office Research Centre, and Universities.
Computer Aided Design Centre, Madingley Road, Cambridge CB3 OHB, UK
Two in one A seven-segment led display with a grey-coloured surface is available from Siemens as a twin-colour display. It is initially available only in a 10 mm character height version. Each illuminated segment of this display is equipped with two anti-parallel semiconductor chips. Changing the emission colour from red to green and vice versa follows via simple changing of the polarity of the operating voltage/ current: the chip which lies in the forward direction is illuminated. The ability of the display to present information is greatly enhanced by the introduction of 'reversible' colours. Digitally displayed values can be presented in two colours. Changing from green to red can serve as a warning
DISPLAYS. APRIL 1981