Organic light-emitting diode display device
An OLED display device includes an array of pixel units. Each pixel unit includes a pixel driving circuit and an OLED. The pixel units in each column is connected to a data line. The pixel units in each row is connected to a first scan line for selecting and activating pixel units to receive a data voltage provided by the data line. The pixel units in each row is connected to a second scan line for selecting and resetting pixel units. An emission control line connected to the pixel units in each odd-numbered row is connected to a first clock signal end. An emission control line connected to the pixel units in each even-numbered row is connected to a second clock signal end. Two emission control signals outputted by the first and second clock signal ends have the same period and have a stable phase difference between 90° and 180°.
1. An organic light-emitting diode display device comprising:
an array of pixel units, with each of the pixel units including a pixel driving circuit and an organic light-emitting diode, with the pixel units in each column of the array connected to a data line providing a data voltage to the pixel units, with the pixel units in each row of the array connected to a first scan line for selecting and activating the pixel units to receive the data voltage, with the pixel units in each row of the array connected to a second scan line for selecting and resetting the pixel units,
wherein the pixel units in each row are connected to an emission control line that sends an emission control signal to the pixel units,
wherein the emission control line connected to the pixel units in each odd-numbered row of the array is connected to a first clock signal end,
wherein the emission control line connected to the pixel units in each even-numbered row of the array is connected to a second clock signal end, and
wherein two emission control signals outputted by the first and second clock signal ends have a same period and have a stable phase difference between 90° and 180°;
wherein each pixel unit enters a reset state under control by a second scan signal provided by the second scan line, and wherein the data voltage stored in each pixel unit in the reset state is cleared.
2. The organic light-emitting diode display device according to claim 1 , wherein when the second scan signal provided by the second scan line is at a low level, each of the pixel units selected by the second scan line enters the reset state.
3. The organic light-emitting diode display device according to claim 2 , wherein when one of the pixel units is in the reset state, the emission control signal received by the one of the pixel units from the emission control line connected thereto is in an active state.
4. The organic light-emitting diode display device according to claim 3 , wherein when one of the pixel units is in the reset state, the voltage at two ends of the organic light-emitting diode of the one of the pixel units is smaller than a conductive threshold voltage of the organic light-emitting diode.
5. The organic light-emitting diode display device according to claim 1 , wherein each pixel unit enters a data voltage writing state under control by a first scan signal provided by the first scan line, and wherein each pixel unit in the data voltage writing state receives and stores the data voltage provided by the data line connected thereto.
6. The organic light-emitting diode display device according to claim 5 , wherein the pixel driving circuit of each pixel unit further includes a storage capacitor, and wherein each pixel unit stores the data voltage from the data line in the storage capacitor thereof.
7. The organic light-emitting diode display device according to claim 6 , wherein the pixel driving circuit of each pixel unit further includes a driving transistor, and wherein when each pixel unit is in a data voltage writing procedure, the data voltage containing a threshold voltage of the driving transistor is stored in the storage capacitor thereof.
8. The organic light-emitting diode display device according to claim 5 , wherein when the first scan signal provided by the first scan line is at a low level, each pixel unit selected by the first scan line enters the data voltage writing state.
9. The organic light-emitting diode display device according to claim 5 , wherein when one of the pixel units is in the data voltage writing state, the emission control signal received by the one of the pixel units from the emission control line connected thereto is in a null state.
10. The organic light-emitting diode display device according to claim 5 , wherein when each of the first and second scan signals received by the one of the pixel units is at a high level, the one of the pixel units is in an emissive state, and wherein the one of the pixel units in the emissive state receives and is controlled by the emission control signal from the emission control line connected thereto to activate the organic light-emitting diode of the one of the pixel units to emit light.
11. The organic light-emitting diode display device according to claim 10 , wherein when the emission control signal received by the one of the pixel units in the emissive state is active, the pixel driving circuit of the one of the pixel units drives the organic light-emitting diode of the one of the pixel units to emit light.
12. The organic light-emitting diode display device according to claim 11 , wherein when the pixel driving circuit of the one of the pixel units drives the organic light-emitting diode of the one of the pixel units to emit light, a luminance of the pixel driving circuit of the one of the pixel units is a function of the data voltage of the one of the pixel units.
13. The organic light-emitting diode display device according to claim 11 , wherein when the emission control signal received by the one of the pixel units in the emissive state is in the null state, the organic light-emitting diode of the one of the pixel units is in an off state.
14. The organic light-emitting diode display device according to claim 13 , wherein the emission control signal received by the one of the pixel units is a periodical signal switching between the active state and the null state.
15. The organic light-emitting diode display device according to claim 5 , wherein one and only one row of pixel units is in the data voltage writing state during any moment of operation of the organic light-emitting diode display device.
16. The organic light-emitting diode display device according to claim 1 , wherein the active state of the emission control signal is a low level, and the null state of the emission control signal is a high level.
17. The organic light-emitting diode display device according to claim 16 , wherein the emission control signal is square waves.
18. The organic light-emitting diode display device according to claim 17 , wherein the emission control signal has a duty cycle in a range of 0.5-0.9.
19. The organic light-emitting diode display device according to claim 1 , wherein one and only one row of pixel units is in the reset state during any moment of operation of the organic light-emitting diode display device.