Patent ID: 8860658

Claim:
An electrophoretic display unit comprising: an electrophoretic display panel comprising a medium, a first area and a second area, wherein the medium has embedded therein a plurality of electrophoretic display elements controlled by a first and a second pixel electrode; a sensor constructed to generate a signal dependent on a temperature of the electrophoretic display panel; a driver for driving the electrophoretic display panel; wherein the sensor includes a resistance sensor constructed to detect a resistance of the medium between a first and a second sensor electrode, and the driver is controllable according to the resistance detected by the resistance sensor, wherein a first electrode layer comprises individual electrode portions, one of said individual electrode portions is dedicated as the first sensor electrode and another of said individual electrode portions is dedicated as the first pixel electrode, and the first sensor electrode does not overlap the first pixel electrode, wherein the first pixel electrode is formed in the first area, the first sensor electrode is formed in the second area, and the second area is a border around the first area, wherein the resistance sensor is configured to detect the resistance of the medium during periodically recurring time intervals, the electrophoretic display unit configured such that outside the time intervals a control voltage is applied at the first sensor electrode and the second sensor electrode such that the border assumes a predetermined gray-value or color, wherein the sensor is part of a sensor unit, the sensor unit comprising: an oscillator circuit that includes the resistance sensor and that generates an electric signal with a frequency dependent on a resistive value of the resistance sensor.