Data signal processing device and display device having the same
A data signal processing device includes a load calculator and a compensation processor. The load calculator calculates an on-pixel rate (OPR) based on image data signals and positional weight values. The positional weight values are determined based on locations of pixels in a display panel. The OPR is proportional to a frame luminance load, which corresponds to a sum of driving currents for the pixels to emit light in each of a plurality of frames. The compensation processor compensates distorted luminance caused by the frame luminance load based on the OPR.
1. A data signal processing device, comprising:
a load calculation circuit to calculate an on-pixel rate (OPR) based on image data signals and positional weight values, the positional weight values to be determined based on locations of pixels in a display panel, the OPR proportional to a frame luminance load which corresponds to a sum of driving currents for the pixels to emit light in each of a plurality of frames; and
a compensation processor to compensate a distorted luminance caused by the frame luminance load based on the OPR, wherein
the positional weight values are determined according to amounts of voltage drops of a power voltage supplied to the pixels.
2. The device as claimed in claim 1 , wherein:
the positional weight values increase as the voltage drop decreases, and
the positional weight values decrease as the voltage drop increases.
3. The device as claimed in claim 1 , wherein:
the positional weight value of a first pixel is greater than the positional weight value of a second pixel, and
the first pixel is closer to a power supply than the second pixel.
4. The device as claimed in claim 3 , wherein:
the power supply is to supply the power voltage from one side of the display panel, and
the first pixel is closer to the one side of the display panel than the second pixel.
5. The device as claimed in claim 1 , wherein the load calculation circuit is to calculate the OPR based on color weight values according to color of light to be emitted from the pixels.
6. The device as claimed in claim 5 , wherein the color weight value of a first pixel is greater than the color weight value of a second pixel that consumes less driving current than the first pixel, to emit light having a same luminance.
7. The device as claimed in claim 6 , wherein:
the first pixel is a blue light emitting pixel, and
the second pixel is a green, or red light emitting pixel.
8. The device as claimed in claim 6 , wherein:
the second pixel is a white light emitting pixel, and
the first pixel is a red, green, or blue light emitting pixel.
9. The device as claimed in claim 1 , wherein the image data signals are converted into gamma signals having target luminance corresponding to grayscale values of light to be emitted by the pixels according to a gamma setting.
10. The device as claimed in claim 9 , further comprising:
a gamma processor to generate the gamma signals based on an input data signal.
11. A data signal processing device, comprising:
a load calculation circuit to calculate an on-pixel rate (OPR) based on image data signals and positional weight values, the positional weight values to be determined based on locations of pixels in a display panel, the OPR proportional to a frame luminance load which corresponds to a sum of driving currents for the pixels to emit light in each of a plurality of frames; and
a compensation processor to compensate a distorted luminance caused by the frame luminance load based on the OPR, wherein the OPR is calculated based on the following equation:
OPR
=
∑
k
=
1
n
(
∑
l
=
1
m
(
(
RData
(
k
,
l
)
×
cr_r
+
GData
(
k
,
l
)
×
cr_g
+
BData
(
k
,
l
)
×
cr_b
)
×
loc_w
(
k
,
l
)
/
3
)
)
(
cr_r
+
cr_g
+
cr_b
)
×
avg
(
loc_w
)
×
n
×
m
,
where n is a number of columns of the display panel, m is a number of rows of the display panel, RData is an image data signal corresponding to a grayscale value of red light, GData is an image data signal corresponding to a grayscale value of green light, BData is an image data signal corresponding to a grayscale value of blue light, loc_w is the positional weight value, avg(loc_w) is an average value of the positional weight value, cr_r is the color weight value of a red light emitting pixel, cr_g is the color weight value of a green light emitting pixel, and cr_b is the color weight value of a blue light emitting pixel.
12. A display device, comprising:
a display panel including a plurality of pixels;
a display panel driver to drive the display panel; and
a timing controller to control the display panel driver, wherein the timing controller has a data signal processor which includes:
a load calculation circuit to calculate an on-pixel rate (OPR) based on image data signals and positional weight values determined based on locations of the pixels in the display panel, the OPR proportional to a frame luminance load which corresponds to a sum of driving currents for the pixels to emit light in each of a plurality of frames; and
a compensation processor to compensate a distorted luminance caused by the frame luminance load based on the OPR, wherein
the positional weight values are determined according to amounts of voltage drops of a power voltage supplied to the pixels.