Touch display controller and touch display system including the same

A touch display controller comprising:

• a select circuit having a first selectable input terminal for touch sensors, a second selectable input terminal for display pixels, and an output terminal;
• an analog front-end circuit coupled to the output terminal of the select circuit to receive a raw analog signal, and having a shared processing path for analog signals from both the touch sensors and the display pixels;
• an analog-to-digital converter coupled to the shared processing path of the analog front-end circuit and configured to output a digital signal based on a processed analog signal;
• and
• a processor configured to determine a driving current flowing to a light-emitting element of at least one display pixel based on the digital signal,
• wherein the processor adjusts a magnitude of a reference voltage, input to at least one of the pixels, with reference to the driving current and a previously stored look-up table.

A touch display system comprising:

• a cover window including a front surface receiving a touch input;
• a touch sensor panel disposed below the cover window and including touch sensors in which a touch sensing signal is generated in response to the touch input;
• a display panel disposed below the cover window and including pixels;
• a wiring area including touch routing connections connected to the touch sensors and pixel routing connections connected to the pixels, the touch routing connections and the pixel routing connections being disposed on a single layer;
• an intermediate insulating layer disposed between the touch sensor panel and the display panel;
• vias penetrating through the intermediate insulating layer and connecting the touch sensor and the touch routing connections to each other;
• and
• a touch display controller connected to the touch sensor panel and the display panel through the wiring area and configured to determine the touch input and to display an image on the display panel,
• wherein the touch display controller includes an analog front-end circuit to process a signal output by the touch sensors and the pixels, and the analog front-end circuit is selectably connected to the touch routing connections or the pixel routing connections.

A touch display panel comprising:

• a select circuit configured to alternately select touch sensors and display pixels included in the touch display panel;
• an analog front-end circuit alternately connected to the touch sensors or the pixels by the select circuit, and configured to generate an analog signal using an output signal from the touch sensors or the pixels;
• and
• a control circuit configured to set a signal amplification gain of the analog front-end circuit to a first value when the touch sensors are connected to the analog front-end circuit, and to set the signal amplification gain of the analog front-end circuit to a second value, different from the first value, when the pixels are connected to the analog front-end circuit.