Sensing circuit and display device having the same
First Claim
1. A sensing circuit for sensing an externally provided pressure on a panel including a first substrate, a second substrate corresponding to the first substrate to have an opposite electrode, and an insulating layer interposed between the first and second substrates, the sensing circuit comprising:
- a sensing capacitor including a sensing electrode on the first substrate, the insulating layer and the opposite electrode, the sensing electrode being connected to a first node;
a first switching element comprising;
a first source electrode receiving a first voltage;
a first gate electrode receiving a first switching signal; and
a first drain electrode electrically connected to the first node;
a second switching element outputting a second current, the second switching element comprising;
a second source electrode receiving a second voltage;
a second gate electrode receiving a second switching signal; and
a second drain electrode electrically connected to a second node; and
a third switching element outputting a third current, the third switching element comprising;
a third source electrode receiving a third voltage;
a third gate electrode electrically connected to the sensing electrode at the first node; and
a third drain electrode electrically connected to the second switching element at the second node,wherein a capacitance of the sensing capacitor is increased by the externally provided pressure, and a voltage level of the first node is decreased by the increased capacitance of the sensing capacitor, andwherein an amount of the third current is decreased by the decreased voltage level of the first node.
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Accused Products
Abstract
A sensing circuit is provided that senses an externally provided pressure on a panel, and includes a sensing capacitor, a first switching element, a second switching element and a third switching element; where the sensing capacitor includes a sensing electrode on the first substrate, the insulating layer and the opposite electrode; the sensing capacitor varies a capacitance based on the externally provided pressure; the first switching element is electrically connected to the sensing electrode to charge the sensing capacitor based on a first switching signal; the second switching element outputs a current based on a second switching signal and a first voltage; the third switching element is electrically connected to the sensing electrode to control the current based on the variation of the capacitance of the sensing capacitor to generate a sensing signal; and where a thickness is decreased, and an image display quality is improved.
44 Citations
14 Claims
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1. A sensing circuit for sensing an externally provided pressure on a panel including a first substrate, a second substrate corresponding to the first substrate to have an opposite electrode, and an insulating layer interposed between the first and second substrates, the sensing circuit comprising:
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a sensing capacitor including a sensing electrode on the first substrate, the insulating layer and the opposite electrode, the sensing electrode being connected to a first node; a first switching element comprising; a first source electrode receiving a first voltage; a first gate electrode receiving a first switching signal; and a first drain electrode electrically connected to the first node; a second switching element outputting a second current, the second switching element comprising; a second source electrode receiving a second voltage; a second gate electrode receiving a second switching signal; and a second drain electrode electrically connected to a second node; and a third switching element outputting a third current, the third switching element comprising; a third source electrode receiving a third voltage; a third gate electrode electrically connected to the sensing electrode at the first node; and a third drain electrode electrically connected to the second switching element at the second node, wherein a capacitance of the sensing capacitor is increased by the externally provided pressure, and a voltage level of the first node is decreased by the increased capacitance of the sensing capacitor, and wherein an amount of the third current is decreased by the decreased voltage level of the first node. - View Dependent Claims (2, 3, 4, 5)
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6. A display device comprising:
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a display panel including; an array substrate; an opposite substrate corresponding to the array substrate to have a common electrode receiving a common voltage; and a liquid crystal layer interposed between the array substrate and the opposite substrate, the liquid crystal layer varying a thickness based on an externally provided pressure on the display panel; a sensing array in the display panel to generate a sensing signal based on the variation of the thickness of the liquid crystal layer, the sensing array including; a sensing capacitor including a sensing electrode on the array substrate, the liquid crystal layer and the common electrode, the sensing electrode being connected to a first node; a first switching element comprising; a first source electrode receiving a first voltage; a first gate electrode receiving a first switching signal; and a first drain electrode electrically connected to the first node; a second switching element outputting a second current, the second switching element comprising; a second source electrode receiving a second voltage; a second gate electrode receiving a second switching signal; and a second drain electrode electrically connected to a second node; and a third switching element outputting a third current, the third switching element comprising; a third source electrode receiving a third voltage; a third gate electrode electrically connected to the sensing electrode at the first node; and a third drain electrode electrically connected to the second switching element at the second node; and a controlling part on the array substrate to generate location data based on a sensing signal corresponding to a difference between the second current and the third current, wherein a capacitance of the sensing capacitor is increased by the externally provided pressure, and a voltage level of the first node is decreased by the increased capacitance of the sensing capacitor, and wherein an amount of the third current is decreased by the decreased voltage level of the first node. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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Specification