EDNE June 2012 - (Page 37)

design for lower-cost, thinner stacks (Figure 1). A high SNR also enables detection of touches from a finger in a thin glove. In general, the technology can sense touch from gloves as thick as 1.5 mm, such as leather, wool, or cotton gloves. An elegant-looking touchscreen design imparts a cool factor that is nearly as important to consumers as the touchscreen’s performance, and industrial design decrees that, for smartphones, thinner is always better. Cypress’ SLIM (single-layerindependent-multitouch) technology makes for a thinner screen because the sensor is one layer rather than two. For conventional two-layer stackups, manufacturers build the sensors on two layers: the X lines and the Y lines in separate layers with an insulator between them. This XY grid is expensive because of the cost of ITO, which is effectively a transparent metal and costs about $1 per diagonal inch of screen. Cypress has created a proprietary pattern that allows the routing of both the X and the Y sensors on the same surface in one layer with no jumpers or vias (Figure 2). John Carey, director of marketing for TrueTouch controllers at Cypress, claims that SLIM makes for the thinnest and lowest-cost touchscreen sensor and works for screens as large as 4.5 in. diagonally. The company does not reveal what the pattern is; customers work with Cypress’ licensed-partner touchscreen suppliers. Your question: Can the ¸RTO also perform logic analysis? Our answer: Yes! Test embedded designs quickly and accurately with the MSO option. A new hardware option turns the ¸RTO into an MSO. It provides 16 additional digital channels with an input frequency of up to 400 MHz. The advantages at a glance: across the entire 200 Msample memory depth types for pinpointing faults vehicle, it cannot be at the same level. do touchscreens work reliably with gloved fingers? The use of touchscreens with gloves can introduce issues regarding actuation and positive response. Traditional touchscreens cannot sense control [with a user with] a glove on [because the touchscreen] needs contact with skin. There are specialized gloves that the consumer could wear, but expecting consumers to purchase and wear these gloves is unrealistic. [Some new] touchscreens use an electronic field above the surface, which, when the field is broken, the areas … would actuate the intended control. This [action] can be done [by a user] with gloves. However, the additional issue of gloved-hand use is that the glove increases the size of the finger and could introduce unintended use if the control layout on the touchscreen is too small. a eas of the vehicle. The flexibility and personalization opportunities are appealing to automotive consumers, given the time spent in vehicles and consumers’ desire to make this time useful, comfortable, connected, and entertaining. There are always challenges to the placement of screens, both dedicated and touch, in a vehicle. Issues with interaction, sight lines, reach zones, and glare will determine when a touchscreen versus a dedicated screen is the better alternative. The likely outcome is that we will see a hybrid of screen types, along with traditional buttons and knobs for functions [in which] familiarity enhances use and minimizes distraction. Also, the integration of improved voice recognition as part of the entire control set will surely influence how and where screens will be used. For more information, visit: www.scope-of-the-art.com/ad/faq-mso rEfErENCEs A Conner, Margery, “Single-layer touchscreens gain new controller, ITO sensor,” EDN, April 5, 2012, pg 18, http://bit.ly/IjQHTk. B O’Donnell, Jayne, “Some Ford owners to get touch-screen software fix soon,” USA Today, Feb 8, 2012, http:// usat.ly/GG7Ze6. where do you see touchscreens going in the automotive market? will they become a must-have or a niceto-have feature over the next five years? Alternatively, will some hybrid of touchscreens and dedicated screens emerge? There are compelling reasons to use touchscreens in multiple ar- a www.edn-europe.com June 2012 | EDN EUROPE 37 http://www.scope-of-the-art.com/ad/faq-mso http://www.bit.ly/IjQHTk http://www.usat.ly/GG7Ze6 http://www.usat.ly/GG7Ze6 http://www.edn-europe.com

Table of Contents for the Digital Edition of EDNE June 2012

Agilent Technologies
International Rectifier
RS Components
International Rectifier
Analog Devices
Test & Measurement
Silicon Labs
Test-driven development for embedded C: why debug?
Baker’s best
Cover story
Rohde & Schwarz
Rohde & Schwarz
Rohde & Schwarz
Rohde & Schwarz
Rohde & Schwarz
Pico-projector design uses color LEDs
Digital isolation in smart energy metering applications
Mechatronics in design
Design Idea
Product Roundup
Tales from the cube

EDNE June 2012