EL display apparatus

1. An electroluminescent (EL) display apparatus, comprising:

a display screen including a plurality of gate signal lines which is arranged to intersect a plurality of source signal lines, and a pixel provided with an EL device corresponding to each intersection of the plurality of gate signal lines and the plurality of source signal lines;

a driving transistor provided for each pixel to supply a current to the EL device;

a first switch transistor provided for each pixel on a current path through which the current flows from a power line through the driving transistor to the EL device; and

a gate driver circuit connected to the plurality of gate signal lines,

wherein the gate driver circuit is configured to turn the first switch transistor on and off to simultaneously generate a plurality of band-shaped non-display regions and a plurality of band-shaped display regions on the display screen and to move the plurality of band-shaped non-display regions and the plurality of band-shaped display regions relative to the display screen,

the plurality of band-shaped non-display regions is spaced apart on the display screen with one of the plurality of band-shaped display regions being between a pair of the plurality of band-shaped non-display regions,

the plurality of band-shaped display regions is spaced apart on the display screen with one of the plurality of band-shaped non-display regions being between a pair of the plurality of band-shaped display regions, and

the gate driver circuit is configured to change a duty ratio by which the display screen is divided into the plurality of band-shaped non-display regions and the plurality of band-shaped display regions.

2. The EL display apparatus according to claim 1 , wherein

the gate driver circuit is configured to turn the first switch transistor on and off to generate the plurality of band-shaped non-display regions and the plurality of band-shaped display regions on the display screen for one frame period.

3. The EL display apparatus according to claim 1 , further comprising:

a source driver circuit connected to the plurality of source signal lines,

wherein the source driver circuit is configured to supply a signal voltage to a gate of the driving transistor to flow a current which is N times as large as a predetermined value to the EL device to achieve a gray scale display indicated by an image signal, and

N is greater than one.

4. The EL display apparatus according to claim 1 ,

wherein the gate driver circuit is configured to change a number of divisions by which the display screen is divided into the plurality of band-shaped non-display regions and the plurality of band-shaped display regions depending on at least one of a brightness adjustment, a type of image data, or whether a display image is a motion image or a still image.

5. The EL display apparatus according to claim 1 ,

wherein the gate driver circuit is configured to change a ratio of an area of the plurality of band-shaped non-display regions on the display screen to an area of the plurality of band-shaped display regions on the display screen depending on a brightness adjustment.

6. The EL display apparatus according to claim 1 , further comprising:

a second switch transistor provided for each pixel to supply, to the driving transistor, an image signal supplied by the plurality of source signal lines,

wherein the gate driver circuit includes a first gate driver circuit and a second gate driver circuit,

a first gate signal line is connected to a gate terminal of the first switch transistor and a second gate signal line is connected to a gate terminal of the second switch transistor, and

the first gate driver circuit supplies an on/off signal for the first switch transistor to the first gate signal line and the second gate driver circuit supplies an on/off signal for the second switch transistor to the second gate signal line.

7. The EL display apparatus according to claim 6 ,

wherein the first switch transistor and the second switch transistor are independently on/off controlled by the first gate driver circuit and the second gate driver circuit.

8. The EL display apparatus according to claim 6 ,

wherein the first gate driver circuit includes a shift register circuit, and outputs a select signal or a non-select signal for the plurality of the first gate signal lines,

the first gate driver circuit is configured to turn the first switch transistor on and off to simultaneously generate the plurality of band-shaped non-display regions and the plurality of band-shaped display regions on the display screen and to move the plurality of band-shaped non-display regions and the plurality of band-shaped display regions relative to the display screen, and

the first gate driver circuit is configured to be controlled by a start pulse fed to the shift register circuit.

9. The EL display apparatus according to claim 8 , wherein

the gate driver circuit is configured to turn the first switch transistor on and off to control the duty ratio by controlling an input pulse timing of the start pulse fed to the shift register circuit for one frame period.

10. The EL display apparatus according to claim 8 , wherein

the gate driver circuit is configured to turn the first switch transistor on and off to control a number of divisions by which the display screen is divided into the plurality of band-shaped non-display regions and the plurality of band-shaped display regions by controlling an input pulse timing of the start pulse fed to the shift register circuit for one frame period.

11. The EL display apparatus according to claim 6 ,

wherein the first gate driver circuit is configured to select a plurality of the first gate signal lines simultaneously.

12. The EL display apparatus according to claim 6 ,

wherein the first gate signal lines are divided into a plurality of blocks, a plurality of first gate signal lines in one block are connected as one control line, and the first gate driver circuit is configured to select the plurality of first gate signal lines as a block simultaneously.

13. The EL display apparatus according to claim 1 ,

wherein the gate driver circuit is configured to move the plurality of band-shaped non-display regions and the plurality of band-shaped display regions relative to the display screen.

14. The EL display apparatus according to claim 1 ,

wherein the gate driver circuit is configured to move the band-shaped non-display regions and the band-shaped display regions across a pixel row in the display screen plural times in one frame period.

15. The EL display apparatus according to claim 1 ,

wherein the gate driver circuit is configured to asymmetrically generate the plurality of band-shaped non-display regions and the plurality of band-shaped display regions on the display screen.

16. An electronic device, comprising:

the EL display apparatus according to claim 1 .

17. A method of controlling an electroluminescent (EL) display apparatus,

the EL display apparatus comprising:

a display screen including a plurality of gate signal lines which is arranged to intersect a plurality of source signal lines, and a pixel provided with an EL device corresponding to each intersection of the plurality of gate signal lines and the plurality of source signal lines;

a driving transistor provided for each pixel to supply a current to the EL device;

a first switch transistor provided for each pixel on a current path through which the current flows from a power line through the driving transistor to the EL device; and

a gate driver circuit connected to the plurality of gate signal lines,

the method comprising:

turning the first switch transistor on and off to simultaneously generate a plurality of band-shaped non-display regions and a plurality of band-shaped display regions on the display screen and to move the plurality of band-shaped non-display regions and the plurality of band-shaped display regions relative to the display screen,

wherein the plurality of band-shaped non-display regions is spaced apart on the display screen with one of the plurality of band-shaped display regions being between a pair of the plurality of band-shaped non-display regions,

the plurality of band-shaped display regions is spaced apart on the display screen with one of the plurality of band-shaped non-display regions being between a pair of the plurality of band-shaped display regions, and

the gate driver circuit is configured to change a duty ratio by which the display screen is divided into the plurality of band-shaped non-display regions and the plurality of band-shaped display regions.