In-cell touch for LED
First Claim
Patent Images
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.
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Abstract
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.
33 Citations
17 Claims
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1. A touch screen comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for operating a touch screen comprising:
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operating, during a display phase, a first layer as a cathode of a light-emitting diode (LED) layer by setting a voltage of a gate voltage line to a first voltage, the gate voltage line connected to a gate terminal of a second transistor that is connected to a first transistor, the first transistor connected to the LED layer and a power supply line, and the first voltage causing the second transistor to turn on; and operating, during a touch sensing phase, the first layer as touch circuitry by setting the voltage of the gate voltage line to a second voltage, the second voltage causing the second transistor to turn off. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification