Memory in pixel, data storage method in pixel and pixel array
View Patent ↗A memory in pixel, a data storage method, and a pixel array. The memory in pixel includes a data input unit, configured to read data voltage on a data line onto a first data latching terminal and a second data latching terminal; a first data latching circuit, configured to hold a level of the first data latching terminal; a second data latching circuit, configured to hold a level of the second data latching terminal; a drive control circuit, configured to enable a level of a drive node to be opposite to that of the first data latching terminal; and a drive circuit, configured to output a third power source voltage of a third power source voltage terminal to a output terminal and output a fourth power source voltage of a fourth power source voltage terminal to the output terminal.
1. A memory in pixel, comprising:
a data input circuit, connected to a data line (DATA), a first control signal terminal (S 1 ), a first data latching terminal (IN 1 ) and a second data latching terminal (IN 2 ), and configured to read data voltage (Vdata) on the data line onto the first data latching terminal (IN 1 ) and the second data latching terminal (IN 2 ) when a first control signal of the first control signal terminal is at its effective level;
a first data latching circuit, connected to the first data latching terminal (IN 1 ) and configured to hold a level of the first data latching terminal (IN 1 );
a second data latching circuit, connected to the second data latching terminal (IN 2 ) and configured to hold a level of the second data latching terminal (IN 2 );
a drive control circuit, connected to the first data latching terminal (IN 1 ) and a drive node (M) and configured to enable a level of the drive node (M) to be opposite to that of the first data latching terminal (IN 1 ); and
a drive circuit, connected to the drive node (M), the second data latching terminal (IN 2 ) and an output terminal (OUT), and configured to output a third power source voltage of a third power source voltage terminal to the output terminal (OUT) when the drive node (M) is at its effective level and output a fourth power source voltage of a fourth power source voltage terminal to the output terminal (OUT) when the second data latching terminal (IN 2 ) is at its effective level.
2. The memory in pixel according to claim 1 , wherein,
the first data latching circuit is further connected to the drive node (M) and a second control signal terminal (S 2 ), and configured to enable the level of the first data latching terminal (IN 1 ) to be opposite to that of the drive node (M) when the second control signal terminal (S 2 ) is at its effective level; and
the second data latching circuit is further connected to the output terminal (OUT) and the second control signal terminal (S 2 ), and further configured to enable the level of the second data latching terminal (IN 2 ) to be opposite to that of the output terminal (OUT) when the second control signal terminal (S 2 ) is at its effective level.
3. The memory in pixel according to claim 2 , wherein, the first data latching circuit includes:
a first holding transistor (T 10 ), having a gate electrode connected to the second control signal terminal (S 2 ), a first electrode connected to the first data latching terminal (IN 1 ) and a second electrode connected to a first node (N);
a first control transistor (T 8 ) of the first node, having a gate electrode and a first electrode connected to a first power source voltage terminal, and a second electrode connected to the first node (N); and
a second control transistor (T 9 ) of the first node, having a gate electrode connected to the drive node (M), a first electrode connected to the first node (N), and a second electrode connected to a second power source voltage terminal.
4. The memory in pixel according to claim 3 , wherein, the second data latching circuit includes:
a second holding transistor (T 5 ), having a gate electrode connected to the second control signal terminal (S 2 ), a first electrode connected to the second data latching terminal (IN 2 ) and a second electrode connected to a second node (Q);
a first control transistor (T 3 ) of the second node, having a gate electrode and a first electrode connected to the third power source voltage terminal, and a second electrode connected to the second node (Q); and
a second control transistor (T 4 ) of the second node, having a gate electrode connected to the output terminal (OUT), a first electrode connected to the second node (Q), and a second electrode connected to the fourth power source voltage terminal.
5. The memory in pixel according to claim 3 , wherein, the second data latching circuit is further connected to the first node (N), and the second data latching circuit includes:
a second holding transistor (T 5 ), having a gate electrode connected to the second control signal terminal (S 2 ), a first electrode connected to the second data latching terminal (IN 2 ) and a second electrode connected to the second node (Q);
a first control transistor (T 3 ) of the second node, having a gate electrode connected to the first node (N), a first electrode connected to the third power source voltage terminal, and a second electrode connected to the second node (Q); and
a second control transistor (T 4 ) of the second node, having a gate electrode connected to the output terminal (OUT), a first electrode connected to the second node (Q), and a second electrode connected to the fourth power source voltage terminal.
6. The memory in pixel according to claim 4 , wherein, the data input circuit includes:
a first input transistor (T 11 ), having a gate electrode connected to the first control signal terminal (S 1 ), a first electrode connected to the data line (DATA) and a second electrode connected to the first data latching terminal (IN 1 ); and
a second input transistor (T 12 ), having a gate electrode connected to the first control signal terminal (S 1 ), a first electrode connected to the data line (DATA) and a second electrode connected to the second data latching terminal (IN 2 ).
7. The memory in pixel according to claim 5 , wherein, the data input circuit includes:
a first input transistor (T 11 ), having a gate electrode connected to the first control signal terminal (S 1 ), a first electrode connected to the data line (DATA) and a second electrode connected to the first data latching terminal (IN 1 ); and
a second input transistor (T 12 ), having a gate electrode connected to the first control signal terminal (S 1 ), a first electrode connected to the data line (DATA) and a second electrode connected to the second data latching terminal (IN 2 ).
8. The memory in pixel according to claim 6 , wherein, the drive control circuit includes:
a first drive control transistor (T 6 ), having a gate electrode and a first electrode connected to the first power source voltage terminal, and a second electrode connected to the drive node (M); and
a second drive control transistor (T 7 ), having a gate electrode connected to the first data latching terminal (IN 1 ), a first electrode connected to the drive node (M), and a second electrode connected to the second power source voltage terminal.
9. The memory in pixel according to claim 7 , wherein, the drive control circuit includes:
a first drive control transistor (T 6 ), having a gate electrode and a first electrode connected to the first power source voltage terminal, and a second electrode connected to the drive node (M); and
a second drive control transistor (T 7 ), having a gate electrode connected to the first data latching terminal (IN 1 ), a first electrode connected to the drive node (M), and a second electrode connected to the second power source voltage terminal.
10. The memory in pixel according to claim 8 , wherein, the drive circuit includes:
a first drive transistor (T 1 ), having a gate electrode connected to the drive node (M), a first electrode connected to the third power source voltage terminal, and a second electrode connected to the output terminal (OUT); and
a second drive transistor (T 2 ), having a gate electrode connected to the second data latching terminal (IN 2 ), a first electrode connected to the output terminal (OUT), and a second electrode connected to the fourth power source voltage terminal.
11. The memory in pixel according to claim 9 , wherein, the drive circuit includes:
a first drive transistor (T 1 ), having a gate electrode connected to the drive node (M), a first electrode connected to the third power source voltage terminal, and a second electrode connected to the output terminal (OUT); and
a second drive transistor (T 2 ), having a gate electrode connected to the second data latching terminal (IN 2 ), a first electrode connected to the output terminal (OUT), and a second electrode connected to the fourth power source voltage terminal.
12. The memory in pixel according to claim 10 , wherein, each transistor is an NMOS transistor, an effective level of the drive node (M) is a high level, the first power source voltage terminal is a first high power source voltage terminal (VDD), the second power source voltage terminal is a first low power source voltage terminal (VSS), the third power source voltage terminal is a second high power source voltage terminal (VDH) and the fourth power source voltage terminal is a second low power source voltage terminal (VDL).
13. The memory in pixel according to claim 11 , wherein, each transistor is an NMOS transistor, an effective level of the drive node (M) is a high level, the first power source voltage terminal is a first high power source voltage terminal (VDD), the second power source voltage terminal is a first low power source voltage terminal (VSS), the third power source voltage terminal is a second high power source voltage terminal (VDH) and the fourth power source voltage terminal is a second low power source voltage terminal (VDL).
14. The memory in pixel according to claim 10 , wherein, each transistor is a PMOS transistor, an effective level of the drive node (M) is a low level, the first power source voltage terminal is a first low power source voltage terminal (VSS), the second power source voltage terminal is a first high power source voltage terminal (VDD), the third power source voltage terminal is a second low power source voltage terminal (VDL) and the fourth power source voltage terminal is a second high power source voltage terminal (VDH).
15. The memory in pixel according to claim 11 , wherein, each transistor is a PMOS transistor, an effective level of the drive node (M) is a low level, the first power source voltage terminal is a first low power source voltage terminal (VSS), the second power source voltage terminal is a first high power source voltage terminal (VDD), the third power source voltage terminal is a second low power source voltage terminal (VDL) and the fourth power source voltage terminal is a second high power source voltage terminal (VDH).
16. A data storage method in a pixel, wherein the pixel includes the memory in pixel according to claim 1 and a liquid crystal display unit, and the data storage method comprises:
in a first time period, a first control signal of the first control signal terminal (S 1 ) is at its effective level, a second control signal of the second control signal terminal (S 2 ) is at its ineffective level, the data input circuit reads the data voltage (Vdata) on the data line (DATA) onto the first data latching terminal (IN 1 ) and the second data latching terminal (IN 2 ), the level of the drive node (M) is opposite to that of the first data latching terminal (IN 1 ), and the level of the output terminal (OUT) of the drive circuit is opposite to that of the data voltage; and
in a second time period, a second control signal of the second control signal terminal (S 2 ) is at its effective level, a first control signal of the first control signal terminal (S 1 ) is at its ineffective level, the data input circuit isolates the data line (DATA) from the first data latching terminal (IN 1 ) and the second data latching terminal (IN 2 ), the first data latching circuit holds a level of the first data latching terminal (IN 1 ), and the second data latching circuit holds a level of the second data latching terminal (IN 2 ), such that the level of the output terminal (OUT) of the drive circuit is held to be unchanged.
17. A pixel array, wherein each pixel includes a memory in pixel according to claim 1 and a liquid crystal display unit.