Compensation method of display device and display device having compensation value storage unit

1. A compensation method, comprising:

dividing a display panel into a foveated area and a non-foveated area;

performing high-density compensation for the foveated area; and

performing low-density compensation for the non-foveated area,

wherein performing the high-density compensation comprises:

detecting deterioration for all of a plurality of pixels in the foveated area;

generating first compensation values for the plurality of pixels in the foveated area; and

performing compensation for the plurality of pixels in the foveated area using the first compensation values; and

wherein performing the low-density compensation comprises:

detecting deterioration for a subset of pixels among a plurality of pixels in the non-foveated area, the subset including less than all of the plurality of pixels in the non-foveated area;

generating second compensation values for the subset of pixels in the non-foveated area; and

performing compensation for all of the plurality of pixels in the non-foveated area using the second compensation values.

2. The compensation method of claim 1 ,

wherein performing the compensation for all of the plurality of pixels in the non-foveated area comprises dividing all of the plurality of pixels into a plurality of sub-groups, each sub-group including at least one pixel of the subset of pixels.

3. The compensation method of claim 2 ,

wherein for a sub-group of the plurality of sub-groups, performing compensation for the at least one pixel of the subset of pixels in the sub-group; and

performing the same compensation for pixels in the sub-group excluding the at least one pixel.

4. The compensation method of claim 2 ,

wherein for a sub-group of the plurality of sub-groups, generating second compensation values required for a plurality of pixels in the sub-group;

calculating an average value of the second compensation values for the plurality of pixels in the sub-group; and

performing compensation for the plurality of pixels in the sub-group based on the average value.

5. The compensation method of claim 2 ,

wherein for a sub-group of the plurality of sub-groups, generating second compensation values required for a plurality of pixels in the sub-group;

calculating a median value of the second compensation values for the plurality of pixels in the sub-group; and

performing compensation for the plurality of pixels in the sub-group based on the median value.

6. The compensation method of claim 2 ,

wherein a number of pixels excluding the subset of pixels in the plurality of sub-groups increases toward outside of the display panel.

7. The compensation method of claim 1 ,

wherein the foveated area is a central area of the display panel of a virtual reality display device.

8. A display device, comprising:

a timing controller;

a data driving unit for receiving a driving signal from the timing controller;

a gate driving unit for receiving the driving signal from the timing controller;

a display panel having a plurality of pixels, for displaying video based on signals received from the data driving unit and the gate driving unit, and divided into a foveated area and a non-foveated area;

a power supply unit for supplying power to the data driving unit, the gate driving unit, and the display panel; and

a storage unit for storing a compensation value for compensating the plurality of pixels,

wherein the display device:

detects deterioration for all of a plurality of pixels in the foveated area and generates first compensation values for the plurality of pixels in the foveated area, and

detects deterioration for a subset of pixels among a plurality of pixels in the non-foveated area, the subset including less than all of the plurality of pixels in the non-foveated area and generates second compensation values for the subset of pixels in the non-foveated area, wherein the storage unit stores the first compensation values and the second compensation values, and

wherein the timing controller:

performs compensation for all of the plurality of pixels in the foveated area using the first compensation values, and

performs compensation for all of the plurality of pixels in the non-foveated area using the second compensation values.

9. The display device of claim 8 ,

wherein all of the plurality of pixels in the non-foveated area are divided into a plurality of sub-groups,

wherein the storage unit stores a second compensation value for one pixel of a plurality of pixels in a sub-group of the plurality of sub-groups, and

wherein the timing controller performs the compensation for the plurality of pixels in the sub-group based on the second compensation value for the one pixel.

10. The display device of claim 8 ,

wherein all of the plurality of pixels in the non-foveated area are divided into a plurality of sub-groups,

wherein the storage unit stores an average value or a median value of second compensation values of a plurality of pixels in a sub-group of the plurality of sub-groups, and

wherein the timing controller performs the compensation for the plurality of pixels in the sub-group based on the average value or the median value of the second compensation values.

11. The display device of claim 8 , wherein the storage unit comprises:

a high-density header portion for storing information indicative of high-density;

a high-density body portion for storing the first compensation values of the plurality of pixels in the foveated area;

a low-density header portion for storing information indicative of low-density; and

a low-density body portion for storing the second compensation values of the subset of pixels in the non-foveated area.

12. The display device of claim 11 ,

wherein a lateral number of memory cells in the high-density body portion is the same as a lateral number of the plurality of pixels in the foveated area, and

wherein a longitudinal number of memory cells in the high-density body portion is the same as a longitudinal number of the plurality of pixels in the foveated area.

13. The display device of claim 12 ,

wherein a lateral number of memory cells in the low-density body portion is the same as the lateral number of memory cells in the high-density body portion, and

wherein a longitudinal number of memory cells in the low-density body portion is the same as the longitudinal number of memory cells in the high-density body portion.