Input-output integrated type display device
First Claim
1. An input-output integrated type display device comprising:
- a liquid crystal display panel having pixel electrodes arranged in a matrix form, switching elements that are arranged in a matrix form and connected to the pixel electrodes, a plurality of scanning lines commonly connected to a control terminal of each of the switching elements arranged in the direction of row, a first insulating substrate on which a plurality of reference wiring lines commonly connected to the pixel electrodes arranged in the direction of row via the switching elements are formed, a second insulating substrate on which a plurality of stripe-shaped signal wiring lines commonly opposite to the pixel electrodes arranged in the direction of column are formed, and a liquid crystal layer held between the first insulating substrate and the second insulating substrate;
a display control means for turning on the switching elements in rows with a scanning signal inputted to the plurality of scanning lines in a display period so as to connect the pixel electrodes to the reference wiring lines and inputting a voltage to the plurality of signal wiring lines according to display data so as to apply a display voltage corresponding to the display data across the pixel electrodes connected to the reference wiring lines and the signal wiring lines;
a position information control means for simultaneously inputting the position information signal that represents a position on the liquid crystal display panel to the plurality of signal wiring lines in a non-display period;
a position information signal detection means for detecting the position information signal inputted to the signal wiring line located in the vicinity of its tip portion; and
a position detection means for detecting a tip position of the position information signal detection means on the liquid crystal display panel on the basis of the position information signal detected by the position information signal detection means.
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Accused Products
Abstract
Input position is accurately detected. In an x-detection period of a non-display period, a source drive circuit simultaneously applies to all signal wiring lines a pulse of a peak value proportional to a distance from a gate drive circuit. A coordinate detection circuit obtains an x-coordinate on the basis of a voltage induced at a pen corresponding to the peak value (x-coordinate) of the applied pulse. In a y-detection period, a pulse generation circuit applies one pulse to a common line. The pen detects a potential variation in amplitude proportional to a distance (y-coordinate) from the source drive circuit, generated approximately simultaneously on all the signal wiring lines via a capacitance. The coordinate detection circuit obtains the y-coordinate similarly to the case of x-coordinate detection.
36 Citations
24 Claims
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1. An input-output integrated type display device comprising:
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a liquid crystal display panel having pixel electrodes arranged in a matrix form, switching elements that are arranged in a matrix form and connected to the pixel electrodes, a plurality of scanning lines commonly connected to a control terminal of each of the switching elements arranged in the direction of row, a first insulating substrate on which a plurality of reference wiring lines commonly connected to the pixel electrodes arranged in the direction of row via the switching elements are formed, a second insulating substrate on which a plurality of stripe-shaped signal wiring lines commonly opposite to the pixel electrodes arranged in the direction of column are formed, and a liquid crystal layer held between the first insulating substrate and the second insulating substrate; a display control means for turning on the switching elements in rows with a scanning signal inputted to the plurality of scanning lines in a display period so as to connect the pixel electrodes to the reference wiring lines and inputting a voltage to the plurality of signal wiring lines according to display data so as to apply a display voltage corresponding to the display data across the pixel electrodes connected to the reference wiring lines and the signal wiring lines; a position information control means for simultaneously inputting the position information signal that represents a position on the liquid crystal display panel to the plurality of signal wiring lines in a non-display period; a position information signal detection means for detecting the position information signal inputted to the signal wiring line located in the vicinity of its tip portion; and a position detection means for detecting a tip position of the position information signal detection means on the liquid crystal display panel on the basis of the position information signal detected by the position information signal detection means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An input-output integrated type display device comprising:
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a liquid crystal display panel having pixel electrodes arranged in a matrix form, switching elements that are arranged in a matrix form and connected to the pixel electrodes, a plurality of scanning lines commonly connected to a control terminal of each of the switching elements arranged in the direction of row, a first insulating substrate on which a plurality of reference wiring lines commonly connected to the pixel electrodes arranged in the direction of row via the switching elements are formed, a second insulating substrate on which a plurality of stripe-shaped signal wiring lines commonly opposite to the pixel electrodes arranged in the direction of column are formed, and a liquid crystal layer held between the first insulating substrate and the second insulating substrate; a display control means for turning on the switching elements in rows with a scanning signal inputted to the plurality of scanning lines in a display period so as to connect the pixel electrodes to the reference wiring lines and inputting a voltage to the plurality of signal wiring lines according to display data so as to apply a display voltage corresponding to the display data across the pixel electrodes connected to the reference wiring lines and the signal wiring lines; a position information control means for simultaneously inputting the position information signal that represents a position on the liquid crystal display panel to the plurality of signal wiring lines in a non-display period; a position information signal detection means for detecting the position information signal inputted to the signal wiring line located in the vicinity of its tip portion; a position detection means for detecting a tip position of the position information signal detection means on the liquid crystal display panel on the basis of the position information signal detected by the position information signal detection means; wherein the position information signal is comprised of a first position information signal that represents a position in the direction of row and a second position information signal that represents a position in the direction of column on the liquid crystal display panel, and wherein the first position information signal is a digital signal that represents the position in the direction of row by a combination of a voltage level that exceeds a reference voltage level and a voltage level that does not exceed the reference voltage level. - View Dependent Claims (22, 23)
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24. An input-output integrated type liquid crystal display device comprising:
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a thin film transistor (TFT) substrate including an array of TFTs, wherein the TFTs are electrically connected to scanning lines, reference lines, and pixel electrodes of the liquid crystal display; an opposite substrate including a plurality of signal lines that are perpendicular to the scanning lines, a liquid crystal layer provided between the TFT substrate and the opposite substrate, and wherein pixels are provided where the pixel electrodes of the TFT substrate cross the signal lines of the opposite substrate; a source drive circuit for applying source signals to the signal lines during a display period, and wherein the signal lines overlap a common line on the opposite substrate so as to form respective capacitances therebetween; a pulse generation circuit for applying pulses to the common line during a position detection period; and wherein potential variations on the common line during the detection period are transferred partially to the signal lines across said respective capacitances so as to cause spike-like potentials on the signal lines that are used in detecting a position of a stylus on the liquid crystal display device.
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Specification