Viewing angle controllable touch panel device and display device

A display device comprising:

• an OLED display panel;
• a viewing angle controllable touch panel device disposed on the display panel;
• and
• a controller,
• wherein the viewing angle controllable touch panel device includes:
• a plurality of upper viewing angle control electrodes;
• a plurality of first touch panel electrodes and a plurality of second touch panel electrodes disposed on a thin-film encapsulation structure of the OLED display panel without a substrate interposed;
• and
• a plurality of electrophoretic elements disposed between the plurality of upper viewing angle control electrodes and a touch panel electrode array including the plurality of first touch panel electrodes and the plurality of second touch panel electrodes in a layering direction, each electrophoretic element including electrophoretic particles and a dispersion medium,
• wherein the controller is configured to control potentials of the plurality of upper viewing angle control electrodes,
• wherein the controller is configured to conduct the potential control in a sensing period and a non-sensing period that are repeated alternately,
• wherein the controller is configured to perform touch sensing in the sensing period by controlling potentials of the plurality of first touch panel electrodes and the plurality of second touch panel electrodes,
• wherein the controller is configured to control a viewing angle in the non-sensing period by controlling states of electrophoretic particles in the plurality of electrophoretic elements with electric fields between the plurality of upper viewing angle control electrodes and the plurality of first and second touch panel electrodes, and
• wherein the non-sensing period is longer than the sensing period.