Light-emitting display device, electronic apparatus, burn-in correction device, and program

1. A light-emitting display device comprising:

a display panel having a plurality of light-emitting elements disposed on a substrate in a matrix;

a deterioration amount difference calculation section for calculating a deterioration amount difference caused between a correction target pixel and a reference pixel in a first light-emitting period;

a correction amount calculation section for calculating a correction amount necessary to eliminate the calculated deterioration amount difference in a second light-emitting period for each correction target pixel in accordance with an estimated deterioration amount of the reference pixel;

a deterioration amount difference correction section for correcting a gradation value of a corresponding pixel with the calculated correction amount;

a gamma conversion section for performing a gamma conversion on the gradation value corrected by the deterioration amount difference correction section to supply the display panel with the gradation value;

an actual deterioration amount calculation section for inputting the gradation value supplied from the gamma conversion section to the display panel to calculate an actual deterioration amount corresponding to the reference pixel;

an estimation error detection section for detecting an error amount between the estimated deterioration amount and the actual deterioration amount calculated with respect to the reference pixel to update an input-output relation used by the gamma conversion section so as to eliminate the error amount; and

an estimated correction operation section for performing an estimated correction operation by alternately repeating an accumulation of an estimated deterioration amount difference between the pixels and correcting the accumulated deterioration amount difference.

2. The light-emitting display device according to claim 1 , wherein

the estimation error detection section

includes a group of conversion tables including input-output relations corresponding to the error amount, and

retrieves the conversion table corresponding to the detected error amount to update the input-output relation of the gamma conversion section.

3. The light-emitting display device according to claim 1 , wherein

the reference pixel is a pixel emitting light having an average gradation value of all the pixels forming an effective display area.

4. The light-emitting display device according to claim 1 , wherein

the reference pixel is set for every group of the light-emitting elements for emitting the light of the same color.

5. The light-emitting display device according to claim 1 , wherein

the deterioration amount corresponding to each of the gradation values is provided as a value obtained by converting an amount of drop of the luminance actually measured when the emission of the light with the gradation value continues for a predetermined period of time into a value per every unit time.

6. The light-emitting display device according to claim 1 , wherein

the correction amount calculation section

obtains the deterioration amount difference Y caused between the correction target pixel and the reference pixel in a first light-emitting period t 1 as

Y =(α1−α2)· t 1

 using a deterioration rate α 1 of the correction target pixel and the deterioration rate α 2 of the reference pixel caused in the first light-emitting period, and

obtains a deterioration rate β 1 of the correction target pixel necessary to eliminate the deterioration amount difference Y in a second light-emitting period t 2 as

β1=β2− Y/t 2

 using a deterioration rate β 2 of the reference pixel estimated in the second light-emitting period.

7. An electronic apparatus comprising:

a display panel having a plurality of light-emitting elements disposed on a substrate in a matrix;

a computer system;

a deterioration amount difference calculation section for calculating a deterioration amount difference caused between a correction target pixel and a reference pixel in a first light-emitting period;

a correction amount calculation section for calculating a correction amount necessary to eliminate the calculated deterioration amount difference in a second light-emitting period for each correction target pixel in accordance with an estimated deterioration amount of the reference pixel;

a deterioration amount difference correction section for correcting a gradation value of a corresponding pixel with the calculated correction amount;

a gamma conversion section for performing a gamma conversion on the gradation value corrected by the deterioration amount difference correction section to supply the display panel with the gradation value;

an actual deterioration amount calculation section for inputting the gradation value supplied from the gamma conversion section to the display panel to calculate an actual deterioration amount corresponding to the reference pixel;

an estimation error detection section for detecting an error amount between the estimated deterioration amount and the actual deterioration amount calculated with respect to the reference pixel to update an input-output relation used by the gamma conversion section so as to eliminate the error amount; and

an estimated correction operation section for performing an estimated correction operation by alternately repeating an accumulation of an estimated deterioration amount difference between the pixels and correcting the accumulated deterioration amount difference.

8. The electronic apparatus according to claim 7 , wherein

the electronic apparatus is a portable terminal device.

9. The electronic apparatus according to claim 7 , wherein

the electronic apparatus is a printing device implementing a printing unit.

10. The electronic apparatus according to claim 7 , wherein

the electronic apparatus is an imaging apparatus implementing an imaging device.

11. A burn-in correction device for correcting burn-in of a display panel having a plurality of light-emitting elements disposed on a substrate in a matrix, comprising:

a deterioration amount difference calculation section for calculating a deterioration amount difference caused between a correction target pixel and a reference pixel in a first light-emitting period;

a correction amount calculation section for calculating a correction amount necessary to eliminate the calculated deterioration amount difference in a second light-emitting period for each correction target pixel in accordance with an estimated deterioration amount of the reference pixel;

a deterioration amount difference correction section for correcting a gradation value of a corresponding pixel with the calculated correction amount;

a gamma conversion section for performing a gamma conversion on the gradation value corrected by the deterioration amount difference correction section to supply the display panel with the gradation value;

an actual deterioration amount calculation section for inputting the gradation value supplied from the gamma conversion section to the display panel to calculate an actual deterioration amount corresponding to the reference pixel;

an estimation error detection section for detecting an error amount between the estimated deterioration amount and the actual deterioration amount calculated with respect to the reference pixel to update an input-output relation used by the gamma conversion section so as to eliminate the error amount; and

an estimated correction operation section for performing an estimated correction operation by alternately repeating an accumulation of an estimated deterioration amount difference between the pixels and correcting the accumulated deterioration amount difference.

12. A computer program product comprising a non-transitory computer readable medium including program code thereon to perform a process for correcting burn-in of a display panel having a plurality of light-emitting elements disposed on a substrate in a matrix, the program code being executable to perform operations comprising:

calculating a deterioration amount difference caused between a correction target pixel and a reference pixel in a first light-emitting period;

calculating a correction amount necessary to eliminate the calculated deterioration amount difference in a second light-emitting period for each correction target pixel in accordance with an estimated deterioration amount of the reference pixel;

correcting a gradation value of a corresponding pixel with the calculated correction amount;

performing a gamma conversion on the gradation value corrected by the deterioration amount difference correction section to supply the display panel with the gradation value;

inputting the gradation value supplied to the display panel to calculate an actual deterioration amount corresponding to the reference pixel;

detecting an error amount between the estimated deterioration amount and the actual deterioration amount calculated with respect to the reference pixel to update an input-output relation used by the gamma conversion step so as to eliminate the error amount; and

performing an estimated correction operation by alternately repeating an accumulation of an estimated deterioration amount difference between the pixels and correcting the accumulated deterioration amount difference.