Image display device
View Patent ↗The invention is to provided an integrated, optical touch panel type image display device free from crosstalk with displayed images. The image display device according to the invention comprises a plurality of pixels having display brightness modulation means controlled with display signals, a display unit in which the plurality of pixels are arrayed, and a plurality of optical detecting means provided within the display unit wherein each of the optical detecting means comprises an optical detection diode for converting incident lights into signal electric-carriers, signal electric-carrier resetting means for resetting the signal electric-carriers, and output impedance modulating means for detecting the signal electric-carriers and modulating output impedances. The output impedance modulating means in the optical detecting elements are connected, in series between each other, to a Y output line and an X output line.
1. An image display device comprising:
pixels arranged in a shape of a matrix in a display area;
optical detecting elements arranged in a shape of a matrix in the display area;
X output lines disposed in a horizontal direction;
Y output lines disposed in a vertical direction;
high voltage power supply lines;
low voltage power supply lines;
reset lines;
a X output scanning circuit; and
a Y output scanning circuit,
wherein each of the optical detecting elements comprises an optical detection diode, a reset TFT, a X output TFT and a Y output TFT,
a path of the optical detection diode is directly connected between one of the high voltage power supply lines and one of the low voltage power supply lines through a source-drain path of the reset TFT,
a gate of the reset TFT is directly connected to one of the reset lines;
gates of the X output TFT and the Y output TFT are directly connected to one end of the optical detection diode,
each of the X output lines is directly connected between a high voltage source terminal and the X output scanning circuit through one of source-drain paths of the X output TFTs, and
each of the Y output lines is directly connected between the high voltage source terminal and the Y output scanning circuit through one of source-drain paths of the Y output TFTs.
2. An image display device according to claim 1 , further comprising a position detection circuit,
wherein the X output scanning circuit comprises X preset TFTs, a X preset line, X output line capacitors, X scan TFTs, a X signal output line, and a X scanning circuit, the Y output scanning circuit comprises Y preset TFTs, a Y preset line, Y output line capacitors, Y scan TFTs, a Y signal output line, and a Y scanning circuit,
gates of the X preset TFTs are connected to the X preset line and each source-drain path of the X preset TFTs is directly connected between one of the X output lines and a ground,
each of the X output line capacitors is directly connected between one of the X output lines and the ground,
each of the X scan TFTs is directly connected between one of the X output lines and the X signal output line,
gates of the Y preset TFTs are directly connected to the Y preset line and each source-drain path of the Y preset TFTs is directly connected between one of the Y output lines and the ground,
each of the Y output line capacitors is connected between one of the Y output lines and the ground,
each of the Y scan TFTs is directly connected between one of the Y output lines and the Y signal output line,
wherein when the reset TFTs turn off, the X scanning circuit scans the gates of the X scan TFTs, the Y scanning circuit scans the gates of the Y scan TFTs, and the position detection circuit extracts touch input address information based on outputs from the X and Y signal outputs lines after the reset TFTs turn on.
3. The image display device according to claim 2 , further comprising;
X sampling TFTs;
Y sampling TFTs;
a X sampling gate line; and
a Y sampling gate line,
wherein gates of the X sampling TFTs are directly connected to the X sampling gate line,
gates of the Y sampling TFTs are directly connected to the Y sampling gate line,
each source-drain path of the X sampling TFTs is directly connected between one of the X output lines and one of the X output line capacitors, and
each source-drain path of the Y sampling TFTs is directly connected between one of the Y output lines and one of the Y output line capacitors.
4. The image display device according to claim 2 , wherein the X output TFT and the Y output TFT are n-type TFTs.
5. The image display device according to claim 2 , wherein the X output TFT and the Y output TFT are p-type TFTs.
6. An image display device comprising:
pixels arranged in a shape of a matrix in a display area;
optical detecting elements arranged in a shape of a matrix in the display area;
X output lines disposed in a horizontal direction;
Y output lines disposed in a vertical direction;
power supply lines;
X output scanning circuit; and
Y output scanning circuit,
wherein each of the optical detecting elements comprises an optical detection diode, a X output TFT, and a Y output TFT,
one end of the optical detection diode is directly connected to one of the power supply lines and the other end of the optical detection diode is directly connected to gates of the X output TFT and the Y output TFT,
the X output lines are directly connected between a high voltage source terminal and the X output scanning circuit through one of source-drain paths of the X output TFTs, and
the Y output lines are directly connected between the high voltage source terminal and the Y output scanning circuit through one of source-drain paths of the Y output TFTs.
7. An image display device according to claim 6 , further comprising a position detection circuit,
wherein the X output scanning circuit comprises X preset TFTs, a X preset line, X output line capacitors, X scan TFTs, a X signal output line and a X scanning circuit,
the Y output scanning circuit comprises Y preset TFTs, a Y preset line, Y output line capacitors, Y scan TFTs, a Y signal output line, and a Y scanning circuit,
gates of the X preset TFTs are directly connected to a X preset line, and each source-drain path of the X preset TFTs is directly connected between one of the X output lines and a ground,
each of the X output line capacitors is directly connected between one of the X output lines and the ground,
each of the X TFTs is directly connected between one of the X output lines and the X signal output line,
gates of the Y preset TFTs are directly connected to a Y preset line, and each source-drain path of the Y preset TFTs is directly connected between one of the Y output lines and the ground;
each of the Y output line capacitors is directly connected between one of the Y output lines and the ground,
each of the Y scan TFTs is directly connected between one of the Y output lines and the Y signal output line,
wherein when the reset TFTs turn off, X scanning circuit scans the gates of the X scan TFTs, Y scanning circuit scans the gates of the Y scan TFTs, and the position detection circuit extracts touch input address information based on outputs from the X and Y signal outputs lines after the reset TFTs turn on.
8. The image display device according to claim 7 , further comprising;
X sampling TFTs;
Y Sampling TFTs;
a X sampling gate line; and
a Y sampling gate line,
wherein gates of the X sampling TFTs are directly connected to the X sampling gate line,
gates of the Y sampling TFTs are directly connected to the Y sampling gate line,
each source-drain path of the X sampling TFTs is directly connected between one of the X output lines and one of the X output line capacitors, and
each source-drain path of the Y sampling TFTs is directly connected between one of the Y output lines and one of the Y output line capacitors.
9. The image display device according to claim 6 , wherein the X output TFTs and the Y output TFTs are n-type TFTs.
10. The image display device according to claim 6 , wherein the X output TFTs and the Y output TFTs are p-type TFTs.