Screens and touch screens Sample Clauses

Screens and touch screens. Touch screens To help older people and those with hand tremors, active fields should be as large as possible and separated by a ‘dead area’. There should be high contrast between touch areas, text and background colour to ensure that the older adults are able to read the text presented (Xxxx, 2004). Try to achieve at least 50:1 contrast (e.g., black text to white background, measured from solid black and solid white areas); for transmission, displays prefer LCDs rather than CRTs when screen size is held constant because of the generally higher contrast ratio on backlit LCDs. Luminance meter readings taken near the screen on a white and black patch on a typical LCD monitor are 140/.8 = 175, and from a CRT monitor 71/1.5 = 47 (Xxxx et al., 2004). Colourful patterns, pictures or watermarks in the background may interfere with the readability of text. Therefore, the use of solid, light backgrounds with dark text will make the text easier to read by older adults (Xxxx et al., 2004; Echt in Xxxxxxx et al., 2003, Xxxx, 2004). Consider providing white on black text when using CRT displays for those with significant visual impairments (Xxxx et al., 2004). Screens should be positioned so that they are shaded from overhead lighting or sunlight, which will reflect glare (Xxxx, 2004). Touch screens can either be triggered by insertion or withdrawal of the fingertip. With the latter system, it would be possible for the user to pass their fingertip over the screen and get speech output describing the active area being touched at the time. Then the system is only triggered by withdrawing the fingertip from over an active area (Xxxx, 2004). It is already possible to increase the size of the characters on the screen for individuals who require this facility. This can be done by selecting this option from a menu or, preferably, by storing this information on the customer’s card. With touch screen systems, it could be arranged that holding one’s finger in the bottom right corner for at least two seconds indicates that one would like larger characters on the screen. Screens should be as large as possible so that larger text can be used. Larger screens also allow more space to position text and active areas (Xxxx, 2004). To use a touch screen from a user-propelled wheelchair, the height of the active areas should be between 800mm and 1200mm for most users. In addition, the screen should be perpendicular to the line of sight. If the terminal is also to be used comfortably by sta...
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