×

TFT display, OLED interface and method for detecting the spatial position of extremities in a spatial region located in front of the display

  • US 9,766,733 B2
  • Filed: 04/18/2011
  • Issued: 09/19/2017
  • Est. Priority Date: 04/16/2010
  • Status: Active Grant
First Claim
Patent Images

1. A liquid crystal (LC) display, comprising:

  • a first substrate layer,a first electrode structure, which comprises a plurality of pixel electrodes and is applied to the first substrate layer,a liquid crystal filling, anda single second electrode structure that is designed as a whole area electrode layer and functions as a single counter electrode for the plurality of pixel electrodes,wherein the LC display is provided with a sensor device comprising a plurality of sensor electrodes arranged in rows and columns for detecting in a touch mode a touch of a finger of a user and in a non-touch mode for detecting the finger or a hand of the user in a region located in front of the LC display thereby causing changes in an electric field, wherein each row and each column comprises a plurality of electrically connected sensor elements and wherein the sensor device is configured to operate in one of the touch mode and the non-touch mode,wherein when the sensor device operates in the non-touch mode, the second electrode structure functions as the electric field providing electrode for the sensor device receiving an alternating voltage to generate said electric field and wherein at least one row of connected sensor elements and one column of connected sensor elements are selected to each operate as a receiving electrode, wherein signals from the at least one row of connected sensor elements and one column of connected sensor elements operating as a receiving electrodes are used to determine a three-dimensional position above said sensor device,wherein the alternating voltage fed to the second electrode structure is approximately a square wave signal having a plurality of subsequent rising and falling edges and wherein signals received from the plurality of sensor electrodes are sampled, wherein sampling of the signals received from each sensor electrode is performed with two sampling points per rising and two sampling points per falling edge wherein a first sampling is performed immediately before occurrence of a rising edge or a falling edge and an immediately subsequent second sampling is performed immediately after occurrence of a rising edge or a falling edge and wherein each sampling is performed with a sampling time short enough that the signals received can be assumed to be quasi constant.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×