Software keyboard system using trace of stylus on a touch screen and method for recognizing key code using the same
US6292179A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 6, 1999 |
| Grant date | Sep 18, 2001 |
| Priority date | — |
| Expiry date | May 6, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/04886
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A software keyboard system using the trace of a stylus and a method of recognizing key codes in accordance with the keyboard system are provided. The software keyboard system includes a screen for displaying a keyboard image or other information, a touch panel formed of a transparent material covered on the screen, for generating a coordinate value in accordance with a position pressed by a stylus, an analog-to-digital (A/D) converter for converting an analog coordinate value generated by the touch panel to a digital coordinate value, a memory for storing names of keys forming a keyboard image displayed on the screen and direction range information of a plurality of key codes assigned to each of keys, and a controller for displaying the keyboard image formed by the key names on the screen, receiving a digital value for the trace of the stylus output from the analog-to-digital (A/D) converter to retrieve a position of the stylus and a direction of the trace, reading a key code from the memory according to the stylus position and the trace direction, and outputting the key code. Thus, one key includes numerous codes, to thereby reduce the number of keys, so that the size of the keybo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.