According to the AMOLED display device of the invention, currents are connected in parallel such that the difference between the currents outputted by different source drivers is reduced, hence achieving uniformed currents. The invention is exemplified by an AMOLED display device having three source drivers, but is not limited thereto. The AMOLED display device having more source drivers is still within the scope of protection of the invention.
Referring to
All the currents in the AMOLED display device 20 are transmitted via a printed circuit board (not shown in the diagram) or a glass substrate (not shown in the diagram) inside the AMOLED display device 20.
Referring to
All the currents in the AMOLED display device 30 are transmitted via a printed circuit board (not shown in the diagram) or a glass substrate (not shown in the diagram) inside the AMOLED display device 30.
Referring to
All the currents in the AMOLED display device 40 are transmitted via a printed circuit board (not shown in the diagram) or a glass substrate (not shown in the diagram) inside the AMOLED display device 40.
Unlike the conventional practice in which the source driver individually receives a reference current Iref hence resulting in deviation, the current outputted by each source driver of the AMOLED display device disclosed in the above embodiments of the invention refers to the same reference current Iref and duplicates many identical master currents Im. Consequently, the difference between currents is very small, and the uniformity in the currents of the overall AMOLED display device is improved.
In order to further improve the uniformity in the currents of the overall AMOLED display device, a calibration mechanism can be introduced to the AMOLED display device. Referring to
The master source driver 54 receives a reference current Iref and duplicates the reference current Iref to output a master current Im, and receives a first calibration current Ic1 transmitted back by the slave source driver 56 to output a master data current Idata1 for driving the first group of column pixels. The master data current Idata1 is an average current of the master current Im and the first calibration current Ic1.
The slave source driver 56, coupled to the master source driver 54, duplicates the master current Im as a first slave current Is1, and receives a second calibration current Ic2 transmitted back by the slave source driver 58 to output a first slave data current Idata1 for driving the second group of column pixels. The first slave data current Idata1 is an average current of of the first slave current Is1 and the second calibration current Ic2.
The slave source driver 58, coupled to slave source driver 56, duplicates the first slave current Is1 and a second slave current Is2 and transmits the second calibration current Ic2 to the master source driver 54 according to the second slave current. The second slave current Is2 is substantially equal to the second calibration current Ic2. The slave source driver 58 outputs a second slave data current Idata2 for driving many third column pixels. The second slave data current Idat2 is an average current of the second slave current Is2 and the second calibration current Ic2. That is, the second slave data current Idata2 is substantially equal to the second slave current Is2.
All the currents in the AMOLED display device 50 are transmitted via a printed circuit board (not shown in the diagram) or a glass substrate (not shown in the diagram) inside the AMOLED display device 50. As each source driver has a calibration current, the difference between the currents outputted by each source driver is further reduced, and the uniformity in the currents of the overall AMOLED display device is further improved.
According to the conventional practice, the source driver individually receives a reference current Iref hence causing deviation. According to the AMOLED display device disclosed in the above embodiments of the invention, the currents are connected in parallel and the same reference current is used, such that the difference between the currents outputted different source drivers is reduced, and the uniformity in the currents of the overall AMOLED display device is achieved.
While the invention has been described by way of example and in terms of a preferred embodiment, it is to be understood that the invention is not limited thereto. On the contrary, it is intended to cover various modifications and similar arrangements and procedures, and the scope of the appended claims therefore should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements and procedures.
Number | Date | Country | Kind |
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95112733 | Apr 2006 | TW | national |