In-cell touch for LED
First Claim
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1. A touch screen comprising:
- a substrate;
a patterned cathode layer including a plurality of cathode layer segments, including a first cathode layer segment, a second cathode layer segment, and a third cathode layer segment;
a first encapsulation layer having an overlaying portion overlaying one or more of the plurality of cathode layer segments and a portion disposed between adjacent cathode layer segments, the first encapsulation layer including a first via at a location of the first cathode layer segment and a second via at a location of the second cathode layer segment, wherein;
the third cathode layer segment is between the first cathode layer segment and the second cathode layer segment in the patterned cathode layer, andthe third cathode layer segment is electrically isolated from the first cathode layer segment and the second cathode layer segment; and
a conductive connection having an overlaying portion overlaying the first encapsulation layer, a first connection portion connected to the first cathode layer segment, and a second connection portion connected to the second cathode layer segment, wherein;
the patterned cathode layer is between the substrate and the overlaying portion of the first encapsulation layer.
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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.
326 Citations
14 Claims
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1. A touch screen comprising:
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a substrate; a patterned cathode layer including a plurality of cathode layer segments, including a first cathode layer segment, a second cathode layer segment, and a third cathode layer segment; a first encapsulation layer having an overlaying portion overlaying one or more of the plurality of cathode layer segments and a portion disposed between adjacent cathode layer segments, the first encapsulation layer including a first via at a location of the first cathode layer segment and a second via at a location of the second cathode layer segment, wherein; the third cathode layer segment is between the first cathode layer segment and the second cathode layer segment in the patterned cathode layer, and the third cathode layer segment is electrically isolated from the first cathode layer segment and the second cathode layer segment; and a conductive connection having an overlaying portion overlaying the first encapsulation layer, a first connection portion connected to the first cathode layer segment, and a second connection portion connected to the second cathode layer segment, wherein; the patterned cathode layer is between the substrate and the overlaying portion of the first encapsulation layer. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for operating a touch screen, the method comprising:
sensing a self-capacitance or a mutual capacitance at a respective cathode layer segment, the respective cathode layer segment included in a plurality of cathode layer segments of a patterned cathode layer of the touch screen, including a first cathode layer segment, a second cathode layer segment, and a third cathode layer segment, wherein the touch screen further comprises; a substrate; a first encapsulation layer having an overlaying portion overlaying one or more of the plurality of cathode layer segments and a portion disposed between adjacent cathode layer segments, the first encapsulation layer including a first via at a location of the first cathode layer segment and a second via at a location of the second cathode layer segment, wherein; the third cathode layer segment is between the first cathode layer segment and the second cathode layer segment on the patterned cathode layer, and the third cathode layer segment is electrically isolated from the first cathode layer segment and the second cathode layer segment; and a conductive connection having an overlaying portion overlaying the first encapsulation layer, a first connection portion connected to the first cathode layer segment, and a second connection portion connected to the second cathode layer segment, wherein; the patterned cathode layer is between the substrate and the overlaying portion of the first encapsulation layer. - View Dependent Claims (9, 10, 11, 12, 13, 14)
Specification