Pixel performance improvement by use of a field shield
AssigneeCreator Technology B.V.
InventorsHjalmar Edzer Ayco HUITEMA, Gerwin Hermanus GELINCK
Life of this patent
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Abstract
A pixel cell (100) and method for making the same for an active matrix display includes a pixel pad (110) and a thin film field effect transistor (106) which selectably couples a signal to activate/deactivate the pixel pad. A field shield (112) is formed on an insulating layer (102) and connected to the pixel pad through the insulating layer such that the field shield extends over at least a portion of the pixel pad. The field shield may extend over the thin film transistor and form a second gate (215) used to enhance the performance of the thin film transistor and the pixel cell.
Claims19
A method for forming a pixel for active matrix displays, comprising the steps of:
- forming an insulating layer on a pixel stack, the pixel stack including a thin film transistor, a pixel pad and addressing lines;
- and
- forming a conductive layer on the insulating layer to form a field shield connecting to the pixel pad by passing through the insulating layer and covering at least a portion of the thin film transistor to form a second gate of the film transistor,
- wherein the insulating layer has a different thickness between the field shield and the thin film transistor than between the field shield and other areas of the pixel.
A method for forming a pixel for active matrix displays, comprising the steps of:
- forming an insulating layer over a pixel stack, the pixel stack including a thin film transistor, a pixel pad and addressing lines;
- and
- patterning a conductive layer formed over the insulating layer to form a field shield which connects to the pixel pad, the field shield connecting to the pixel pad by passing through the insulating layer such that the field shield extends over at least a portion of an electrode of the pixel or at least a portion of the thin film transistor,
- wherein the step of patterning the conductive layer includes patterning the conductive layer such that the field shield extends over a portion of a pixel pad of an adjacent pixel to form a capacitive relationship with the pixel pad of the adjacent pixel.
Dependencies are inferred from the claim text.