Memory circuit for display panel driving and driving method thereof
View Patent ↗Provided is a circuit driving method which can minimize a problem generated by a peak current in a display memory device. Data to be transferred to a display panel is read out from a memory cell array storing binary information. The read-out data are stored in source data buffers and a plurality of source data buffers are divided into several groups and then enabled. An enable signal for each group is derived from a single enable signal and has a different delay time. In the source data buffers delayed by each group and enabled, consumption of current is distributed so that a peak current flowing in the overall source data buffer is lowered. Thus, reliability in the operation of a circuit is improved and the operation speed increases.
1. A memory device for driving a display panel comprising:
arrays of memory cells storing binary information;
pairs of bit line-bit bar line connected to the memory cells;
first transfer gates connected to one end of the bit line-bit bar line pairs and switched by first signals to write the binary information into the memory cells;
second transfer gates connected to the other end of bit line-bit bar line pairs and switched to read out the binary information stored in the memory cells; and
data buffers to receive the read-out binary information of the memory cells from the second transfer gates, by the switching operation of the second transfer gates and to store the read-out binary information,
wherein the second transfer gates are switched by second signals which are derived from a single enable signal and divided into several groups, each group of the second signals having a different time delay,
wherein the second signals of each group switch the second transfer gates of a corresponding group to allow the binary information to be transferred from the memory cells to the data buffers through the switched second transfer gates of the corresponding group.
2. The memory device of claim 1 , wherein the different time delay is performed by a circuit including a logic circuit having an inversing function.
3. The memory device of claim 1 , wherein the different time delay is performed by a capacitor, a resistor, or a combination of the capacitor and the resistor.
4. The memory device of claim 1 , wherein the first transfer gates are switched by the column address as being grouped by unit of 2 n , wherein n is a positive integer including 0.
5. The memory device of claim 1 , wherein the time delay is a signal generated by a plurality of delay portions which are connected in series.
6. A memory device for driving a display panel comprising:
a memory cell array storing binary information;
pairs of bit line-bit bar line connected to the memory cells;
first transfer gates connected to one end of the bit line-bit bar line pairs and switched by first signals to write the binary information into the memory cells;
second transfer gates connected to the other end of bit line-bit bar line pairs and switched to read out the binary information stored in the memory cells; and
data buffers to receive the read-out binary information of the memory cells from the second transfer gates, by the switching operation of the second transfer gates and to store the read-out binary information,
wherein the data buffers are enabled by second signals which are derived from a single enable signal and divided into several groups, each group of the second signals having a different time delay,
wherein the second signals of each group enable the data buffers of a corresponding group to allow the binary information to be transferred from the memory cells to the enabled data buffers of the corresponding group.
7. The memory device of claim 6 , wherein the different time delay is performed by a circuit including a logic circuit having an inversing function.
8. The memory device of claim 6 , wherein the different time delay is performed by a capacitor, a resistor, or a combination of the capacitor and the resistor.
9. The memory device of claim 6 , wherein the first transfer gates are switched by the column address as being grouped by unit of 2 n , wherein n is a positive integer including 0.
10. The memory device of claim 6 , wherein the time delay is a signal generated by a plurality of delay portions which are connected in series.
11. A memory device for driving a display panel comprising:
a memory cell array storing binary information;
pairs of bit line-bit bar line connected to the memory cells;
first transfer gates connected to one end of the bit line-bit bar line pairs and switched by first signals to write the binary information into the memory cells;
second transfer gates connected to the other end of bit line-bit bar line pairs and switched to read out the binary information stored in the memory cells; and
data buffers to receive the read-out binary information of the memory cells from the second transfer gates, by the switching operation of the second transfer gates and to store the read-out binary information,
wherein the data buffers are enabled and the second transfer gates are switched by second signals which are derived from a single enable signal and divided into several groups, each group of the second signals having a different time delay,
wherein the second signals of each group switch the second transfer gates of a corresponding group and enable the data buffers of a corresponding group to allow the binary information to be transferred from the memory cells through the switched second transfer gates of the corresponding group to the enabled data buffers of the corresponding group.
12. The memory device of claim 11 , wherein the different time delay is performed by a circuit including a logic circuit having an inversing function.
13. The memory device of claim 11 , wherein the different time delay is performed by a capacitor, a resistor, or a combination of the capacitor and the resistor.
14. The memory device of claim 11 , wherein the first transfer gates are switched by the column address as being grouped by unit of 2 n , wherein n is a positive integer including 0.
15. The memory device of claim 11 , wherein the time delay is a signal generated by a plurality of delay portions which are connected in series.
16. A method of driving a memory device for driving a display panel, wherein data is written on a memory cell array through first transfer gates which are connected to one end of bit lines and partially selected and switched by first signals, the method comprising:
performing a switching operation of second transfer gates connected to the other end of the bit lines to read the written data on the memory cell array; and
transferring the written data from the second transfer gates to data buffers by the switching operation of the second transfer gates connected to the other end of the bit lines, and
wherein the second transfer gates are switched by second signals which are divided into groups, each group of the second signals having a different time delay,
wherein the second signals of each group switch the second transfer gates of a corresponding group to allow the data to be transferred from the memory cell array to the data buffers through the switched second transfer gates of the corresponding group.
17. The method of claim 16 , wherein the different time delay is performed by a circuit including a logic circuit having an inversing function.
18. The method of claim 16 , wherein the different time delay is performed by a capacitor, a resistor, or a combination of the capacitor and the resistor.
19. The method of claim 16 , wherein the first transfer gates are switched by the column address as being grouped by unit of 2 n , wherein n is a positive integer including 0.
20. The method of claim 16 , wherein the time delay is a signal generated by a plurality of delay portions which are connected in series.
21. A method of driving a memory device for driving a display panel, wherein data is written on a memory cell array through first transfer gates which are connected to one end of bit lines and partially selected and switched by first signals, the method comprising:
performing a switching operation of second transfer gates connected to the other end of the bit lines to read the written data on the memory cell array; and
transferring the written data to data buffers from the second transfer gates, by performing the switching operation of the second transfer gates connected to the other end of the bit lines, and
wherein the data buffers are enabled by second signals which are divided into groups, each group of the second signals having a different time delay,
wherein the second signals of each group enable the data buffers of a corresponding group to allow the data to be transferred from the memory cell array to the enabled data buffers of the corresponding group.
22. The method of claim 21 , wherein the different time delay is performed by a circuit including a logic circuit having an inversing function.
23. The method of claim 21 , wherein the different time delay is performed by a capacitor, a resistor, or a combination of the capacitor and the resistor.
24. The method of claim 21 , wherein the first transfer gates are switched by the column address as being grouped by unit of 2 n , wherein n is a positive integer including 0.
25. The method of claim 21 , wherein the time delay is a signal generated by a plurality of delay portions which are connected in series.
26. A method of driving a memory device for driving a display panel, wherein data is written on a memory cell array through first transfer gates which are connected to one end of bit lines and partially selected and switched by first signals, the method comprising:
performing a switching operation of second transfer gates connected to the other end of the bit lines to read the written data on the memory cell array; and
transferring the written data to data buffers by performing the switching operation of the second transfer gates connected to the other end of the bit lines, and
wherein the second transfer gates and the data buffers are simultaneously switched and enabled, respectively, by second signals which are divided into groups, each group of the second signals having a different time delay,
wherein the second signals of each group switch the second transfer gates of a corresponding group and enable the data buffers of a corresponding group to allow the data to be transferred from the memory cell array through the switched second transfer gates of the corresponding group to the enabled data buffers of the corresponding group.
27. The method of claim 26 , wherein the different time delay is performed by a circuit including a logic circuit having an inversing function.
28. The method of claim 26 , wherein the different time delay is performed by a capacitor, a resistor, or a combination of the capacitor and the resistor.
29. The method of claim 26 , wherein the first transfer gates are switched by the column address as being grouped by unit of 2 n , wherein n is a positive integer including 0.
30. The method of claim 26 , wherein the time delay is a signal generated by a plurality of delay portions which are connected in series.