Explore chapters and articles related to this topic
Vision
Published in Anne McLaughlin, Richard Pak, Designing Displays for Older Adults, 2020
LCD is the dominant type of display because of its slim size and low cost. However, because the lighting source for LCDs is behind the actual display, the image may quickly degrade unless the user is viewing from directly in front of the display. The contrast ratio also varies depending on the specific display. LCDs are available in the widest range of sizes from small mobile phone displays (sub-inch) to home theater televisions (several feet).
Test equipment and measurements
Published in Mike Tooley, Electronic Circuits, 2019
The type of display used in digital multi-range meters is either the liquid crystal display (LCD) or the light emitting diode (LED). The former type requires very little electrical power and thus is to be preferred on the grounds of low battery consumption. LCD displays are, however, somewhat difficult to read under certain light conditions and, furthermore, the display response can be rather slow. LED displays can be extremely bright but unfortunately consume considerable power and this makes them unsuitable for use in battery-powered portable instruments.
Quantum dots and their applications
Published in Alexander V. Vakhrushev, Suresh C. Ameta, Heru Susanto, A. K. Haghi, Advances in Nanotechnology and the Environmental Sciences, 2019
Rakshit Ameta, Kanchan Kumari Jat, Jayesh Bhatt, Suresh C. Ameta
Quantum dot-based light-emitting diodes (QD-LEDs) are a form of light-emitting technology. These are considered the next generation of display technology after the organic light-emitting diodes (OLEDs) display. These are different from liquid crystal displays (LCDs), OLEDs, and plasma displays being an ideal blend of more brightness, flexibility efficiency with a long lifetime, as well as low-processing cost.
The Changing Face of Public Broadcasting in India
Published in IETE Journal of Education, 2023
The CRT display has become obsolete now and has been overtaken by LCD displays. The ones put in the market, by the name of LED displays, are also LCD displays, except that the white light source in the back plane is an array of LED’s. The old LCD used a gas discharge tube for backplane illumination. The LCD display is x, y addressed type and individual pixels are defined by address lines. Color signals are steered to individual corresponding LCD elements. Thus the previous discussions, pertaining to signals created with CRT display in mind, have just lost relevance, in the context of LCD display. Address lines and color signal become important for the case of LCD / LED displays. The video interface of yesterday is deeply entrenched in the industry and a decoder is used in the LCD displays to handle analog composite video signals (CVSB). Display standards for TV have been given in Table 2.
Rising advancements in the application of PEDOT:PSS as a prosperous transparent and flexible electrode material for solution-processed organic electronics
Published in Journal of Information Display, 2020
Gunel Huseynova, Yong Hyun Kim, Jae-Hyun Lee, Jonghee Lee
OLEDs are flat self-light-emitting optoelectronic devices commonly applied for display and solid-state lighting technologies [11,33,65]. The simple structure of OLEDs consists of multilayers formed from organic materials functioning as an HTL, a light-emitting active layer, and an electron transport layer (ETL) stacked between two transparent and reflective electrodes called ‘anode’ and ‘cathode,’ respectively [33]. The main parameters defining the efficiency of OLED devices include the external quantum efficiency (EQE), turn-on voltage (VT), current density, current efficiency, power efficiency, color quality, and lifetime [33,66]. OLEDs are ultra-thin, ultra-light, flexible, and simple in design, as well as suitable for large-area electronics [11]. OLED displays are more efficient than liquid crystal displays (LCDs), and they deliver better image quality for lower power consumption. In addition, they do not require a backlight, as LCDs do [85]. OLEDs can also be a safe and excellent light source. They are both transparent and color-tuneable [86]. Although the first practical OLED appeared a little more than 30 years ago, the flexible OLEDs have been on the market for many years, and are the important components for the realization of the future flexible, wearable, foldable, and even biodegradable optoelectronic applications [85–87].
Fabrication of vertically aligned liquid crystal cell without using a conventional alignment layer
Published in Liquid Crystals, 2018
Masanobu Mizusaki, Yohei Nakanishi, Satoshi Enomoto
Liquid crystal displays (LCDs) are the most popular type of flat-panel displays and are used in television sets, notebook computers, smartphones, tablets, car navigations, digital signage and so forth because they have features such as high resolution, low power consumption and thinness. So far, the LCDs have usually used a twisted nematic (TN) mode [1,2], but the TN mode has disadvantages of narrow viewing angle and low contrast ratio. Therefore, other modes with wide viewing angle and high contrast ratio such as in-plane switching mode [3], fringe-field switching mode [4], multidomain vertical alignment (MVA) mode [5] and patterned vertical alignment (PVA) mode [6] have been developed. Among these modes, vertical alignment (VA) modes such as the MVA and PVA modes have a significantly high contrast ratio because liquid crystal (LC) molecules are vertically aligned, which induce little retardation. To achieve VA, VA layers, which are mainly made from polyimides having side chains, are usually prepared on a pair of substrate [7,8]. The preparation of the VA layers usually requires large amount of solvent, high–temperature operation for post-baking and cleaning process [9].