6.1 Occlusion
Because QAZ Keyboard is nearly placed at the center of screen, contents on the screen are occluded by the keyboard. To address this issue, we plan to test the following three design alternatives.
Reduction of keyboard size The second solution is to reduce the size of the keyboard. Since QAZ Keyboard is surrounded by space, ick or drag outward from the keyboard can also be used along with tapping. By utilizing this, outside keys can be shrunken, because using ick or drag can reduce the number of keys required. In this case, however, the optimum region may be different from the one we used in this paper, because it is necessary to rede ne the size of regions smaller by evaluating accuracy of ick or drag.
QAZ Keyboard: QWERTY …show more content…
Because when we input text, we do not look at contents except for input component. Accordingly, reducing the occlusion with the almost transparent keyboard will be feasible.
6.2 Orientation of keys
Orientation of keys may change the learning cost of the QAZ Keyboard, thus is one of our future work. Note that this paper presents QAZ Keyboard with keys oriented to users, i.e., the letter on the top of a key is placed with the same orientation in both keyboards as shown in Figure 1 and 2. However, this arrangement destroys the orientation relationships between the entire keyboard and keys of the conventional QWERTY layout. While there are some alternatives with the orientation of the keys, we believe that one such feasible alternative is to rotate the keys by 90 degrees counterclockwise so that, for example, 'Q' is displayed as '
Q
'.
7 CONCLUSION
We have presented a QAZ Keyboard, a QWERTY keyboard with one-handed thumb for a large touchscreen. To design the keyboard, we rst conducted exper- iments to investigate pointing performance on a large mobile touchscreen using one-hand thumb. The results show that vertically long areas around the center of the touchscreen will be suitable to place a keyboard in terms of accuracy