Pixel sensing device and panel driving device for sensing characteristics of pixels
AssigneeLx Semicon Co., Ltd.
InventorJung Min Choi
Life of this patent
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Abstract
An embodiment relates to a pixel sensing technique. By supplying a precharge voltage to a sensing line using an amplifier used in pixel sensing, it is possible to minimize differences between precharge voltages of sensing lines and solve a crosstalk problem between the sensing lines, while not increasing a size of a pixel sensing device.
Claims16
A pixel sensing device for sensing a pixel, disposed in a panel, through a sensing line, the pixel sensing device comprising:
- an amplifier configured to output a precharge voltage to the sensing line during a first time and to receive a sensing signal, formed in the pixel, through the sensing line and to output the received sensing signal as a sensing voltage during a second time;
- a first switch configured to selectively connect a first input terminal of the amplifier and the sensing line;
- and
- a second switch configured to selectively connect a second input terminal of the amplifier and the sensing line,
- wherein a plurality of sensing lines are connected to different positions of a line, through which the precharge voltage is supplied, and at least two sensing lines are simultaneously supplied with the precharge voltage through the line.
A pixel sensing device for sensing a pixel, disposed in a panel, through a sensing line, the pixel sensing device comprising:
- an amplifier configured to output a precharge voltage to the sensing line during a first time and to receive a sensing signal, formed in the pixel, through the sensing line and to output the received sensing signal as a sensing voltage during a second time;
- a first switch configured to connect a first input terminal and an output terminal of the amplifier;
- a second switch configured to connect a second input terminal and the output terminal of the amplifier;
- and
- a third switch configured to connect a line, through which the precharge voltage is supplied, and the first input terminal of the amplifier,
- wherein the sensing line is connected to the second input terminal of the amplifier.
A panel driving device for driving a panel in which a plurality of pixels are disposed and a plurality of data lines and a plurality of sensing lines connected to the pixels are disposed, the panel driving device comprising:
- a data driving circuit configured to convert image data into a data voltage and to supply the data voltage to a data line;
- and
- a pixel sensing circuit configured to generate sensing data corresponding to a sensing signal formed in a pixel,
- wherein the image data is compensated according to the sensing data,
- wherein the pixel sensing circuit comprises an amplifier which, during a first time, outputs a precharge voltage to the sensing line connected to the pixel and, during a second time, receives the sensing signal, formed in the pixel, through the sensing line and outputs the sensing signal to an analog-to-digital converter;
- and
- a connection change circuit which, during the first time, transfers the precharge voltage to the first input terminal and connects the sensing line to the second input terminal and, during the second time, releases the connection to the precharge voltage and connects the sensing line to the first input terminal instead of the second input terminal.
Dependencies are inferred from the claim text.