Flexible display device with gate-in-panel circuit
Provided are a display panel including a scan driver and a method of operating the same. The display panel includes a shift register including a plurality of stages that shifts and outputs a clock signal. A display area in the display panel is divided into a plurality of driving areas. The stages of the shift register corresponding to each driving area form a stage group. In each stage group, the stages included in the stage group sequentially output a scan signal by using an independent start signal.
1. A display device comprising:
a display panel including a display area divided into a plurality of driving areas;
a level shifter configured to output a plurality of start signals; and
a shift register including a plurality of stage groups, each of the stage groups corresponding to one of the driving areas, wherein each of the stage group includes at least one stage configured to receive a start signal from at least one external start signal line,
wherein first two stages of each of the stage groups are configured to receive the start signal from at least one external start signal line dedicated for the respective stage group, and
wherein, in each of the stage groups, each of the stages excluding first two stages of the respective stage group include a transistor configured to clear noise on a Q-node of the stage by discharging the Q-node of the stage to a low potential voltage upon receiving an initial signal.
2. The display device according to claim 1 , wherein a first stage of each of the stage groups is configured to receive at least two start signals applied via at least two start signal lines dedicated for the respective stage group.
3. The display device according to claim 1 , wherein the initial signal is applied via said at least two start signal lines.
4. The display device according to claim 3 , wherein the initial signal is not applied to the first two stages in each of the stage groups.
5. The display device according to claim 1 , wherein the first two stages in each of the stage groups are dummy stages which do not output a scan signal.
6. The display device according to claim 5 , wherein the first two stages of each of the stage groups are configured to receive the start signal from one external start signal line dedicated for the respective stage group.
7. The display device according to claim 6 , wherein, in each of the stage groups, the dummy stages of the stage group have a different circuit configuration from the remainder of the stages in the same stage group.
8. The display device according to claim 6 , wherein, in each of the stage groups, stages excluding the dummy stages are configured to have the same circuit structure as each other.
9. The display device according to claim 6 , wherein, in each of the stage groups, each of the stages excluding the dummy stages of the respective stage group include a transistor configured to clear noise on a Q-node of the stage by discharging the Q-node of the stage to a low potential voltage upon receiving an initial signal.
10. A method of operating a display device, comprising:
driving a set of stages of a first stage group corresponding to a first driving area of a display panel by supplying a start signal via an external start signal line connected to a first stage of the first stage group;
supplying a reset signal to a lowermost stage of the first stage group; and
driving a set of stages of a second stage group corresponding to a second driving area of the display panel by supplying a start signal via an external start signal line independently connected to a first stage of the second stage group,
wherein first two stages of each of the stage groups are configured to receive the start signal from at least one external start signal line dedicated for the respective stage group, and
wherein, in each of the stage groups, each of the stages excluding first two stages of the respective stage group include a transistor configured to clear noise on a Q-node of the stage by discharging the Q-node of the stage to a low potential voltage upon receiving an initial signal.
11. The method of claim 10 , further comprising performing a touch scan operation prior to driving the set of stages of the second stage group corresponding to the second driving area of the display panel.