Simplified light sensing circuit, light sensing apparatus including the light sensing circuit, method of driving the light sensing apparatus, and image acquisition apparatus and optical touch screen apparatus including the light sensing apparatus
First Claim
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1. A light sensing circuit, comprising:
- an oxide semiconductor transistor including a channel layer including an oxide semiconductor material;
a gate line directly connected to a gate of the oxide semiconductor transistor and configured to provide a gate voltage;
a drive voltage line directly connected to a drain of the oxide semiconductor transistor and configured to provide a drive voltage; and
a data line directly connected to a source of the oxide semiconductor transistor and configured to provide data,wherein the oxide semiconductor transistor is configured to operate as both a light sensing device that senses light and a switch that outputs light sensing data in response to the sensed light without accumulating charges associated with the incident light in a capacitor.
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Abstract
In a simplified light sensing circuit, a light sensing apparatus including the light sensing circuit, a method of driving the light sensing apparatus, and an image acquisition apparatus and optical touch screen apparatus including the light sensing apparatus, the light sensing circuit includes an oxide semiconductor transistor including a channel layer including an oxide semiconductor material, for each pixel. The oxide semiconductor transistor is configured to operate as a light sensing device that senses light and a switch that outputs light sensing data.
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Citations
28 Claims
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1. A light sensing circuit, comprising:
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an oxide semiconductor transistor including a channel layer including an oxide semiconductor material; a gate line directly connected to a gate of the oxide semiconductor transistor and configured to provide a gate voltage; a drive voltage line directly connected to a drain of the oxide semiconductor transistor and configured to provide a drive voltage; and a data line directly connected to a source of the oxide semiconductor transistor and configured to provide data, wherein the oxide semiconductor transistor is configured to operate as both a light sensing device that senses light and a switch that outputs light sensing data in response to the sensed light without accumulating charges associated with the incident light in a capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A light sensing apparatus, comprising:
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a light sensing pixel array including a plurality of light sensing pixels in a plurality of rows and a plurality of columns; and a gate driver including a plurality of gate lines in a row direction, the gate driver being configured to provide a gate voltage and a reset signal to each of the plurality of light sensing pixels via the plurality of gate lines, wherein each of the plurality of light sensing pixels includes; an oxide semiconductor transistor configured to operate as both a light sensing device that senses light and a switch that outputs light sensing data in response to the sensed light without accumulating charges associated with the incident light, in a capacitor; one of the plurality of gate lines being directly connected to a gate of the oxide semiconductor transistor and configured to provide a gate voltage; a drive voltage line directly connected to a drain of the oxide semiconductor transistor and configured to provide a drive voltage; and a data line directly connected to a source of the oxide semiconductor transistor and configured to provide data. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method of driving a light sensing apparatus, the light sensing apparatus comprising a plurality of light sensing pixels in a plurality of rows and a plurality of columns, each of the light sensing pixels including an oxide semiconductor transistor that operates as both a light sensing device sensing light and a switch outputting light sensing data, a gate line directly connected to a gate of the oxide semiconductor transistor and configured to provide a gate voltage, a drive voltage line directly connected to a drain of the oxide semiconductor transistor and configured to provide a drive voltage, and a data line directly connected to a source of the oxide semiconductor, the method comprising:
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applying a negative first voltage to gates of the oxide semiconductor transistors of the plurality of light sensing pixels in a row from among the plurality of rows, and a negative second voltage that is lower than the negative first voltage to the gates of the oxide semiconductor transistors in other rows from among the plurality of rows; sequentially applying the negative first voltage to the gates of the oxide semiconductor transistors of the plurality of light sensing pixels in a next row from among the plurality or rows, and applying the negative second voltage to the gates of the oxide semiconductor transistors of the plurality of light sensing pixels in rows other than the next row from among the plurality of rows; and simultaneously applying a positive third voltage to the gates of the oxide semiconductor transistors of the plurality of the light sensing pixels in all the rows, after the sequential application of the negative first voltage to all rows is completed, wherein the light sensing data is outputted, in response to the sensed light, without accumulating charges associated with the incident light, in a capacitor. - View Dependent Claims (26, 27, 28)
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Specification