JP2007058186A5

JP2007058186A5 -

Info

Publication number: JP2007058186A5
Application number: JP2006196778A
Authority: JP
Filing date: 2006-07-19
Publication date: 2009-08-27
Anticipated expiration: 2026-07-19

Claims

An analog-digital conversion circuit for converting an analog video signal into a digital video signal;
A one-frame average gradation calculation circuit connected to the analog-digital conversion circuit for calculating an average gradation level of one frame;
A subframe number control circuit connected to the one-frame average gradation calculation circuit and increasing or decreasing the number of subframes according to the average gradation level;
And a potential control circuit that changes a voltage applied between the pair of electrodes of the light-emitting element in accordance with the average gray level.

A display portion in which a plurality of pixels each having a light emitting element, a driving thin film transistor that controls supply of current to the light emitting element, and a switching thin film transistor are disposed;
A signal line driving circuit for outputting a video signal every frame period;
A scanning line driving circuit for selecting pixels for writing the video signal;
A power line for supplying the current to the light emitting element;
A one-frame average gradation calculation circuit for calculating an average gradation level of one frame;
A subframe number control circuit for increasing or decreasing the number of subframes in the one frame period according to the average gray level;
A display device comprising: a potential control circuit that changes a voltage applied between the pair of electrodes of the light emitting element in accordance with the average gradation level.

3. The display device according to claim 1, wherein the number of subframes is reduced when the average gradation level becomes lower than a predetermined value.

An analog-digital conversion circuit for converting an analog video signal into a digital video signal;
A one-frame average gradation calculation circuit connected to the analog-digital conversion circuit for calculating an average gradation level of one frame;
Superimposition time gradation method / 2 connected to the one-frame average gradation calculation circuit and changing the gradation method to the superposition time gradation method or the binary digital time gradation method according to the average gradation level / 2 A decimal digital time gray scale conversion circuit;
And a potential control circuit that changes a voltage applied between the pair of electrodes of the light-emitting element in accordance with the average gray level.

A display portion in which a plurality of pixels each having a light emitting element, a driving thin film transistor that controls supply of current to the light emitting element, and a switching thin film transistor are disposed;
A signal line driving circuit for outputting a video signal every frame period;
A scanning line driving circuit for selecting pixels for writing the video signal;
A power line for supplying the current to the light emitting element;
A one-frame average gradation calculation circuit for calculating an average gradation level of one frame;
A superposition time gray scale method / binary digital time gray scale conversion circuit that changes the gray scale method to a superposition time gray scale method or a binary digital time gray scale method according to the average gray level;
A display device comprising: a potential control circuit that changes a voltage applied between the pair of electrodes of the light emitting element in accordance with the average gradation level.

6. The method according to claim 4, wherein when the average gradation level becomes lower than a predetermined value, the superposition time gradation method is changed to the binary digital time gradation method. Display device.

7. The voltage control circuit according to claim 1, wherein the potential control circuit reduces a voltage applied between the pair of electrodes of the light emitting element when the average gradation level becomes higher than a predetermined value. A display device.

8. The voltage control circuit according to claim 1, wherein the potential control circuit increases a voltage applied between the pair of electrodes of the light emitting element when the average gradation level becomes lower than a predetermined value. A display device.

An electronic apparatus comprising the display device according to any one of claims 1 to 8 and an operation key .

Convert the analog video signal input to the display device into a digital video signal,
Calculate the average gradation level of one frame,
Depending on the average gray level, the number of subframes is increased or decreased,
A driving method of a display device, wherein a voltage applied between a pair of electrodes of a light emitting element is changed in accordance with the average gradation level.

11. The display device driving method according to claim 10, wherein the number of subframes is decreased when the average gray level is lower than a predetermined value.

11. The display device driving method according to claim 10, wherein the number of subframes is increased when the average gray level is higher than a predetermined value.

Convert the analog video signal input to the display device into a digital video signal,
Calculate the average gradation level of one frame,
According to the average gradation level, the gradation method is converted into a superposition time gradation method or a binary digital time gradation method,
A driving method of a display device, wherein a voltage applied between a pair of electrodes of a light emitting element is changed in accordance with the average gradation level.

14. The display device driving method according to claim 13, wherein when the average gray level is lower than a predetermined value, the superimposition time gray scale method is converted to the binary digital time gray scale method. .

14. The method of driving a display device according to claim 13, wherein when the average gray level is higher than a predetermined value, the binary digital time gray scale method is converted to the superposition time gray scale method. .

16. The display device driving according to claim 10, wherein a voltage applied between a pair of electrodes of the light emitting element is increased when the average gray level is lower than a predetermined value. Method.

16. The display device driving according to claim 10, wherein when the average gray level is higher than a predetermined value, a voltage applied between the pair of electrodes of the light emitting element is lowered. Method.