X-ray matrix imager based on a multiple-gate-line driving scheme and a shared-gate-line driving scheme
View Patent ↗An X-ray matrix imager is configured to operate based on a multiple-gate-line driving scheme and a shared-data-line driving scheme. The X-ray matrix imager includes a matrix with multiple pixels, multiple gate line sets, multiple data lines, multiple gate drivers, multiple row multiplexers, and multiple pull-down units. Each gate line sets includes a first gate line coupled to a first pixel and a second gate line coupled to a second pixel adjacent to the first pixel. Each data line is coupled to the multiple gate line sets for receiving charges accumulated on the pixels. Each row multiplexer is configured to selectively couple a corresponding gate driver to the first gate line or the second gate line in a corresponding gate line set. Each pull-down unit is configured to couple the first gate line to a constant voltage when the first gate line is not coupled to the corresponding gate driver.
1. A matrix imager, comprising:
a matrix having a plurality of rows of pixels configured to accumulate charges in response to light or radiation;
a plurality of gate line sets, each gate line set including:
a first gate line coupled to a first pixel among a first row of pixels of the matrix, and
a second gate line coupled to a second pixel;
a plurality of data lines, each arranged to be coupled to both the first pixel and the second pixel for receiving charges accumulated on the first pixel and the second pixel;
a first gate driver configured to provide a first select signal for turning on the first pixel and the second pixel;
a first row multiplexer configured to selectively couple the first gate driver to the first gate line or the second gate line; and
a first pull-down unit configured to couple the first gate line to a constant voltage when the first gate line is not coupled to the first gate driver.
2. The matrix imager of claim 1 , wherein:
the first pixel is coupled to a first data line among the plurality of data lines on a first side of the first data line; and
the second pixel is disposed on the first row of pixels of the matrix and coupled to the first data line on a second side of the first data line opposite to the first side of the first data line.
3. The matrix imager of claim 2 , wherein:
the first gate line is further coupled to a third pixel among the first row of pixels of the matrix; and
the second gate line is further coupled to a fourth pixel among the first row of pixels of the matrix, wherein the third pixel is coupled to a second data line among the plurality of data lines on a first side of the second data line, the fourth pixel is coupled to the second data line on a second side of the second data line opposite to the first side of the second data line, and the first data line is adjacent to the second data line.
4. The matrix imager of claim 3 , further comprising:
a read-out circuit configured to receive the charges accumulated in the first row of pixels and generate a plurality of electrical signals accordingly;
a sequence restoring circuit configured to arrange the plurality of electrical signals in a predetermined raster pattern; and
a detection controller configured to control operations of the first gate driver, the first row multiplexer, and the sequence restoring circuit.
5. The matrix imager of claim 4 , wherein:
the first gate driver, the read-out circuit, the sequence restoring circuit, the detection controller are disposed on a same side of the matrix.
6. The matrix imager of claim 2 , further comprising:
a second gate line set comprising:
a third gate line coupled to a third pixel among a second row of pixels of the matrix;
a fourth gate line coupled to a fourth pixel among the second row of pixels of the matrix;
a second row multiplexer configured to selectively couple the first gate driver to the third gate line or the fourth gate line;
a second pull-down unit configured to couple the third gate line to the constant voltage when the third gate line is not coupled to the first gate driver, wherein:
the first gate driver is further configured to provide the first select signal for turning on the third pixel and the fourth pixel;
the third pixel is coupled to the first data line on the first side of the first data line; and
the fourth pixel is coupled to the first data line on the second side of the first data line.
7. The matrix imager of claim 6 , further comprising:
a read-out circuit configured to receive the charges accumulated in the first and second rows of pixels and generate a plurality of electrical signals accordingly;
a sequence restoring circuit configured to arrange the plurality of electrical signals in a predetermined raster pattern; and
a detection controller configured to control operations of the first gate driver, the first row multiplexer, the second row multiplexer and the sequence restoring circuit.
8. The matrix imager of claim 7 , wherein:
the first gate driver, the read-out circuit, the sequence restoring circuit, the detection controller are disposed on a same side of the matrix.
9. The matrix imager of claim 6 , wherein:
the first row multiplexer and the second row multiplexer are disposed on a first side of the matrix; and
the first pull-down unit and the second pull-down unit are disposed on a second side of the matrix opposite to the first side of the matrix.
10. The matrix imager of claim 2 , further comprising:
a second gate line set comprising:
a third gate line coupled to a third pixel among a second row of pixels of the matrix;
a fourth gate line coupled to a fourth pixel among the second row of pixels of the matrix, wherein the third pixel is adjacent to the fourth pixel;
a second gate driver configured to provide a second select signal for turning on the third pixel and the fourth pixel;
a second row multiplexer configured to selectively couple the second gate driver to the third gate line or the fourth gate line; and
a second pull-down unit configured to couple the third gate line to the constant voltage when the third gate line is not coupled to the second gate driver, wherein the third pixel is coupled to the first data line on the first side of the first data line and the fourth pixel are coupled to the first data line on the second side of the first data line.
11. The matrix imager of claim 10 , wherein the first and second row multiplexers are arranged on opposite sides of the matrix.
12. The matrix imager of claim 10 , wherein:
the first row multiplexer and the first pull-down unit are disposed on opposite sides of the matrix; and
the second row multiplexer and the second pull-down unit are disposed on opposite sides of the matrix.
13. The matrix imager of claim 10 , further comprising:
a read-out circuit configured to receive the charges accumulated in the first and second rows of pixels and generate a plurality of electrical signals accordingly;
a sequence restoring circuit configured to arrange the plurality of electrical signals in a predetermined raster pattern; and
a detection controller configured to control operations of the first gate driver, the second gate driver, the first row multiplexer, the second row multiplexer and the sequence restoring circuit.
14. The matrix imager of claim 13 , wherein:
the first gate driver, the second gate driver, the read-out circuit, the sequence restoring circuit, the detection controller are disposed on a same side of the matrix.
15. The matrix imager of claim 1 , wherein the first row multiplexer and the first pull-down unit are disposed on opposite sides of the matrix.
16. The matrix imager of claim 1 , further comprising:
a second gate line set comprising:
a third gate line coupled to a third pixel among the first row of pixels of the matrix;
a fourth gate line coupled to a fourth pixel among a second row of pixels of the matrix;
a second gate driver configured to provide a second select signal for turning on the third pixel and the fourth pixel;
a second row multiplexer configured to selectively couple the second gate driver to the third gate line or the fourth gate line;
a second pull-down unit configured to couple the third gate line to the constant voltage when the third gate line is not coupled to the second gate driver, wherein:
the first pixel is coupled to the first data line on a first side of the first data line;
the second pixel is disposed on a second row of pixels of the matrix and coupled to the first data line a second side of the first data line opposite to the first side of the first data line;
the third pixel is coupled to the first data line on the second side of the first data line; and
the fourth pixel is coupled to the first data line on the second side of the first data line.
17. The matrix imager of claim 16 , wherein the first and second row multiplexers are arranged on opposite sides of the matrix.
18. The matrix imager of claim 17 , wherein:
the first row multiplexer and the first pull-down unit are disposed on opposite sides of the matrix; and
the second row multiplexer and the second pull-down unit are disposed on opposite sides of the matrix.
19. The matrix imager of claim 16 , further comprising:
a read-out circuit configured to receive the charges accumulated in the first and second rows of pixels and generate a plurality of electrical signals accordingly;
a sequence restoring circuit configured to arrange the plurality of electrical signals in a predetermined raster pattern; and
a detection controller configured to control operations of the first gate driver, the second gate driver, the first row multiplexer, the second row multiplexer and the sequence restoring circuit.
20. The matrix imager of claim 19 , wherein:
the first gate driver, the second gate driver, the read-out circuit, the sequence restoring circuit, the detection controller are disposed on a same side of the matrix.
21. The matrix imager of claim 1 , wherein:
each row of pixels in the matrix is coupled to a corresponding data line among the plurality of data lines.
22. The matrix imager of claim 21 , wherein the first row multiplexer and the first pull-down unit are disposed on opposite sides of the matrix.
23. The matrix imager of claim 1 , wherein:
the first row multiplexer comprises:
a first switch including:
a first end coupled to the first gate driver;
a second end coupled to the first gate line; and
a control end coupled to receive a first control signal; and
a second switch including:
a first end coupled to the first gate driver;
a second end coupled to the second gate line; and
a control end coupled to receive a second control signal;
the first pull-down unit comprises:
a third switch including:
a first end coupled to a constant voltage;
a second end coupled to the first gate line; and
a control end coupled to receive a third control signal having a phase opposite to a phase of the first control signal; and
a second switch including:
a first end coupled to the constant voltage;
a second end coupled to the second gate line; and
a control end coupled to receive a fourth control signal having a phase opposite to a phase of the second control signal.
24. The matrix imager of claim 23 , further comprising:
a first inverter coupled between the control end of the first switch and the control end of the third switch; and
a second inverter coupled between the control end of the second switch and the control end of the fourth switch.
25. The matrix imager of claim 23 , further comprising:
a detection controller configured to control operations of the first gate driver, the first row multiplexer and the first pull-down unit, the detection controller including:
a first driver chip configured to supply the first control signal and the second control signal; and
a second driver chip configured to supply the third control signal and the fourth control signal.
26. The matrix imager of claim 25 , further comprising:
a read-out circuit configured to receive the charges accumulated in the first row of pixels and generate a plurality of electrical signals accordingly, wherein the first driver chip and the second driver chip are disposed on opposite sides of the read-out circuit.