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Visual Displays
Published in Julie A. Jacko, The Human–Computer Interaction Handbook, 2012
Christopher M. Schlick, Carsten Winkelholz, Martina Ziefle, Alexander Mertens
Examples of transmission include transparency film used with an overhead projector and slides used with a projector. Different parts of the transparency or slide transmit light of different wavelengths (i.e., color) with different intensity. Transmission is used as a basic principle in many electronic information displays, such as the popular thin film transistor (TFT) LCDs. It is also often combined with other physical principles. For instance, a simple front projection display (see Section 8.4.1) consists of a light source, a TFT LCD that forms the image by transmitting the rays of light through a matrix of liquid crystals picture elements, and finally a projection surface that reflects the light into the eye of the observer.
Optical Instruments for Viewing Applications
Published in Abdul Al-Azzawi, Light and Optics, 2018
The overhead projector is another common type of viewing device, as shown in Figure 14.24. The overhead projector is a display system used to display images to an audience. It typically consists of a large box containing a very bright lamp and a fan to cool it, on top of which is a large Fresnel lens that collimates the light. Above the box, typically on a long arm, is a magnifyer convex lens and a mirror that redirects the light forward onto the screen. Figure 14.25 shows an image formation by an overhead projector.
Optical Instruments for Viewing Applications
Published in Abdul Al-Azzawi, Photonics, 2017
The overhead projector is another common type of viewing device, as shown in Figure 14.24. The overhead projector is a display system used to display images to an audience. It typically consists of a large box containing a very bright lamp and a fan to cool it, on top of which is a large Fresnel lens that collimates the light. Above the box, typically on a long arm, is a magnifyer convex lens and a mirror that redirects the light forward onto the screen. Figure 14.25 shows an image formation by an overhead projector.
Photo-responsive azo-functionalised flexible polymer substrate for liquid crystal alignment
Published in Liquid Crystals, 2020
B. Sivaranjini, K. Mohana, S. Esakkimuthu, V. Ganesh, S. Umadevi
4-Phenylazophenol, 11-bromo-1-undecene, dimethylchlorosilane (HSiMe2Cl), hexachloroplatinicacid (H2PtCl6) and the inorganic compounds, namely, potassium carbonate (K2CO3), potassium iodide (KI), sulphuric acid (H2SO4) and hydrogen peroxide (H2O2) were purchased from TCI chemicals and used without further purification. The solvents used for the synthesis namely, dry butanone, dichloromethane (CH2Cl2) and toluene were of analytical grade. As-received solvents were dried over molecular sieves (4Å, 1–2 mm from Alfa Aesar) and the resulting anhydrous solvents were used to carry out the reactions. The flexible substrate, namely, overhead projector (OHP) film was purchased from a local shop (A4 size, 100 µm). Our characterisation of this film (described later) indicated that cellulose acetate is the main component of the film. The sheet was cut into small pieces of required size and used for surface treatment and subsequent surface modification.
Using VR to teach safety in design: what and how do engineering students learn?
Published in European Journal of Engineering Education, 2023
Melissa Marinelli, Sally A. Male, Andrew Valentine, Andrew Guzzomi, Tom van der Veen, Ghulam Mubashar Hassan
Each workshop was held in a large studio with capacity for 20 students. Students worked in groups of three to eight members. In each studio, three hardware set-ups were provided for shared use, comprising HTC ViveTM headset and controllers and computer with a high-performance graphical processing unit (NvidiaTM GTX 1070). The VR headset image was mirrored onto a flat screen via either a computer monitor or the overhead projector. Each group sat at a shared table adjacent to a 3 × 3 m taped off floor space for the VR operator.