Touch sensitive display for a portable device

Abstract

A portable device is provided having a touch sensitive display (100) comprising an active matrix display element (101) and a touch sensitive element (103). The touch sensitive element (103) is disposed on the viewer distal side of the active matrix display element (101) thereby not affecting the display properties. The touch sensitive element (103) comprises a first and second conductive layer (113, 115) each having a plurality of conductors. The conductive layers (113, 115) sandwich a pressure sensitive layer (117) which modifies an electrical conductivity between two conductors of the two conductive layers (113, 115) in response to a pressure point resulting from an applied pressure. Thus, accurate position detection is achieved. The conductors may be aligned with the active matrix and the requirement for calibration may be obviated.

Description

technical field [0001] The present invention relates to portable devices and touch-sensitive displays for portable devices, in particular to touch-sensitive displays comprising active matrix display elements and touch-sensitive elements. Background technique [0002] In the last few years, a general trend in many types of consumer devices has been to reduce size and increase portability. For example, the use of cellular phones, computers, personal music systems and personal digital assistants (PDAs) has become more widespread. [0003] In the last decade, the handheld and portable consumer electronics and computing markets have become very diverse. The trend has been increasingly towards smaller devices capable of displaying increasing amounts of information, resulting in improved displays with higher resolution. [0004] In addition, the user interface has been greatly improved, and a lot of effort has been put into providing an intuitive interaction mechanism. A frequen...

AI Technical Summary

Problems solved by technology

This degrades the optical performance of touch-sensitive displays and requires materials with suitable optical properties for the realization of touch screens

[0008] In addition, conventional displays tend to include many layers, resulting in considerable thickness of the resulting touch-sensitive display

Another disadvantage of many conventional displays is that they require careful calibration in order to provide accurate position detection, and especially in relation to images displayed on touch-sensitive displays

Images