(based on "Flip Phone")
English version: 06/29/2015, German version: 09/19/2014
By avoiding unnecessary keystrokes and wiping inputs and by using a larger keypad on the touch panel the threshold should be reduced to (at all) use passwords and to choose "more complicated" ones.
To access the lock screen, it usually is necessary, to briefly press a key (Home or Power) and then perform a wipe command on the touch panel.
Then often (depending on the device) the relatively small standard keyboard appears at the bottom of the screen for entering a password.
If you have chosen a password containing upper and lowercase letters, numbers and special characters, you have to turn (possibly several times) between the letters and numbers / special characters keyboard back and forth.
In addition, you have to very carefully tap to avoid incorrect entries due to the small keys.
This often means that users choose a very simple password or even do not use a password at all.
The hinged lid makes keystrokes and wiping inputs to get to the password entry field unnecessary. As with conventional flip phones, the display is switched on by simply opening the lid.
You will see a full-format keypad, which contains all numbers, letters and some special characters. So even "good" passwords can easily and directly be entered.
To enter an uppercase character you hold a letter key for a short time. In the same way you enter a special character. Briefly pressing the "Del" key deletes the last character entered. Long pressing deletes the complete entry.
As feedback for pressing briefly you get a brief vibration and for a long press you get a slightly longer vibration. Acknowledge signals are less suitable because they could reveal something about the length and type of the password.
At the top edge of the display (small enough so that it can be read only by the user) as an additional confirmation you get a number that tells you how many characters you have already entered and whether your most recent letter entered was a CAPITAL LETTER, a lowercase letter, a digit or a special character.