Electric field shielding for in-cell touch type thin-film-transistor liquid crystal displays
First Claim
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1. A display, comprising:
- an upper polarizer;
a lower polarizer;
a liquid crystal layer interposed between the upper polarizer and the lower polarizer;
a touch sensor array below the liquid crystal layer;
a thin-film-transistor substrate, wherein the touch sensor array is formed on the thin-film-transistor substrate;
an electric field shielding layer above the liquid crystal layer;
an additional electric field shielding layer above the liquid crystal layer, wherein the upper polarizer is interposed between the electric field shielding layer and the additional electric field shielding layer, and wherein the electric field shielding layer and the additional electric field shielding layer are electrically coupled to a ground contact on the thin-film-transistor substrate; and
a dot of conductive paste that electrically couples the additional electric field shield layer to the ground contact on the thin-film transistor substrate.
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Abstract
Displays such as liquid crystal displays may be used in electronic devices. During operation of a display, electrostatic charges on the surface of the display may give rise to electric fields. One or more electric field shielding layers may be provided in the display to prevent the electric fields from disrupting operation of the liquid crystals material in the display. The shielding layers may be formed at a location in the stack of layers that make up the display that is above the liquid crystal material of the display. Touch sensors and thin film transistors may be located below the shielding layer.
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Citations
22 Claims
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1. A display, comprising:
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an upper polarizer; a lower polarizer; a liquid crystal layer interposed between the upper polarizer and the lower polarizer; a touch sensor array below the liquid crystal layer; a thin-film-transistor substrate, wherein the touch sensor array is formed on the thin-film-transistor substrate; an electric field shielding layer above the liquid crystal layer; an additional electric field shielding layer above the liquid crystal layer, wherein the upper polarizer is interposed between the electric field shielding layer and the additional electric field shielding layer, and wherein the electric field shielding layer and the additional electric field shielding layer are electrically coupled to a ground contact on the thin-film-transistor substrate; and a dot of conductive paste that electrically couples the additional electric field shield layer to the ground contact on the thin-film transistor substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A display, comprising:
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an upper polarizer; a lower polarizer; a liquid crystal layer interposed between the upper polarizer and the lower polarizer; a touch sensor array below the liquid crystal layer; a thin-film-transistor substrate, wherein the touch sensor array is formed on the thin-film transistor substrate; an electric field shielding layer above the liquid crystal layer, wherein the electric field shielding layer comprises a conductive polymer; and a conductive paste electrically coupled between the electric field shielding layer and a ground terminal on the thin-film-transistor substrate, wherein the conductive paste comprises a dot of metal paint located at a corner of the electric field shielding layer. - View Dependent Claims (16, 17, 18, 19)
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20. A display, comprising:
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an upper polarizer; a lower polarizer; a liquid crystal layer interposed between the upper polarizer and the lower polarizer; a touch sensor array below the liquid crystal layer; an electric field shielding layer above the liquid crystal layer, wherein the electric field shielding layer comprises a conductive polymer; and a switch that is electrically connected between the electric field shielding layer and a ground contact. - View Dependent Claims (21, 22)
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Specification