In-cell touch for LED

摘要

A touch screen having touch circuitry integrated into a display pixel stackup. The touch screen can include a transistor layer, an LED layer and a first layer. The first layer can operate as an LED cathode during a display phase and as touch circuitry during a touch sensing phase. The transistor layer can be at least partially utilized for transitioning between the display phase and the touch sensing phase. The touch screen can be fabricated to reduce or eliminate damage to the LED layer.

主权项

1. A touch screen comprising:
a transistor layer including a first transistor and a second transistor connected to the first transistor; a first layer disposed over the transistor layer and configured to operate as a light-emitting diode (LED) cathode during a display phase and as touch circuitry during a touch sensing phase; an LED layer disposed between the transistor layer and the first layer, wherein the first transistor is connected to the LED layer and a power supply line; and a gate voltage line connected to a gate terminal of the second transistor, wherein during the display phase, the gate voltage line is set to a first voltage, which causes the second transistor to turn on, and during the touch sensing phase, the gate voltage line is set to a second voltage, which causes the second transistor to turn off.