Display device and method for measuring gamma of the same
A gamma measurement method of a display device includes: storing a current value that is measured during gamma tuning of a display panel; resetting a target current of global current management (GCM) by referring to the current value; and measuring gamma of the display panel while applying the target current of the GCM.
1. A gamma measurement method of a display device, the method including:
storing a current value that is measured during gamma tuning of a display panel;
updating a target current of global current management (GCM) from an initial value of the target current based on the current value; and
measuring gamma of the display panel while applying the updated target current of the GCM.
2. The gamma measurement method of claim 1 , wherein
the current value is a value of a current according to a load ratio of a first region that is a measurement region during the gamma tuning.
3. The gamma measurement method of claim 2 , further comprising
selecting a gamma measurement condition of the display panel before the updating of the target current.
4. The gamma measurement method of claim 3 , wherein
the gamma measurement condition includes a second region that is a measurement region before the updating of the target current, and
the updating of the target current includes calculating the target current based on a load ratio relating to the current value and a load ratio of the second region.
5. The gamma measurement method of claim 4 , wherein
the target current is a value obtained by multiplying the current value by a ratio of a load ratio of the second region to a load ratio of the first region.
6. The gamma measurement method of claim 4 , wherein
the load ratio of the first region and the load ratio of the second region are different from each other.
7. The gamma measurement method of claim 4 , wherein
the display panel is divided into a plurality of blocks, and
the target current is updated in consideration of efficiency of a block of the plurality of blocks to which the first region belongs and efficiency of a block of the plurality of blocks to which the second region belongs.
8. The gamma measurement method of claim 7 , wherein
the consideration of the efficiency of the block is to assign current weights such that a block with highest efficiency among the plurality of blocks and another block of the plurality of blocks display same luminance.
9. The gamma measurement method of claim 7 , wherein
the consideration of the efficiency of the block is to set a weight of the block with the highest efficiency among the plurality of blocks to 1, and to set a weight of another block among the plurality of blocks to a value obtained by dividing the highest efficiency by the efficiency of the another block.
10. The gamma measurement method of claim 9 , wherein
when the second region belongs to the plurality of blocks, a weight is calculated in consideration of a ratio of the second region belonging to each of the plurality of blocks and an efficiency of each block.