A touch screen controller is configured for use in an electronic system. The electronic system comprises: the touch screen controller, a host processing system physically distinct from the touch screen controller, a display screen, and a proximity sensor element. The touch screen controller comprises proximity sensor control circuitry, a rendering module, and display refresh circuitry. The proximity sensor control circuitry is configured to operate the proximity sensor element to sense input objects in a sensing region of the electronic system. The rendering module is configured to render three-dimensional object representations for display on the display screen. The display refresh circuitry is configured to update the display screen with an image received from and processed by the host processing system and with the three-dimensional object representation rendered by the rendering module.