1. An adaptive zero-current sense method for a switching regulator including a low-side switch connected to a phase node and switched to control an inductor current, the low-side switch having a body diode, the method comprising the steps of:
A. monitoring the inductor current during the low-side switch is on;
B. triggering a first signal to turn off the low-side switch if the inductor current falls down to a zero-current threshold during the low-side switch is on;
C. monitoring a turn-on time of the body diode after the low-side switch is turned off in response to the first signal;
D. determining a second signal to adjust the zero-current threshold according to the turn-on time of the body diode; and
E. adjusting the zero-current threshold if the turn-on time of the body diode is shorter than a given value.
2. The adaptive zero-current sense method of claim 1, wherein the step A comprises the step of comparing a voltage on the phase node with a reference voltage by a comparator.
3. The adaptive zero-current sense method of claim 2, further comprising the step of turning off the first signal when the voltage on the phase node rises up across the reference voltage.
4. The adaptive zero-current sense method of claim 2, wherein the step C comprises the step of determining the turn-on time of the body diode by using the first signal and the voltage on the phase node.
5. The adaptive zero-current sense method of claim 2, wherein the step E comprises the steps of providing an offset voltage to the input of the comparator which receives the voltage on the phase node or the reference voltage.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method of processing an image, the method comprising:
converting a color space based on input image signals respectively corresponding to a plurality of pixels of the image and outputting hue signals, saturation signals, and first luminance signals for the plurality of pixels of the image based on the input image signals;
calculating margin values indicating margins with respect to maximum brightnesses for the corresponding hue signals;
setting up control values for controlling the first luminance signals based on the corresponding saturation signals and the corresponding margin values;
adjusting brightnesses of the first luminance signals based on the first luminance signals and the corresponding control values and outputting second luminance signals with the adjusted brightnesses; and
converting a color space based on the hue signals, the saturation signals, and the second luminance signals and outputting output image signals having the converted color space.
2. The method of claim 1, wherein the calculating of the margin values comprises:
detecting hue components included in the image indicated by the input image signals based on the hue signals; and
calculating the margin values based on a result of the detecting of the hue components.
3. The method of claim 1, wherein the setting up of the control values comprises:
setting up the control values by selectively using the corresponding margin values for the hue signals and corresponding maximum values defined in maximum defining information for the hue signals.
4. The method of claim 3, wherein the setting up of the control values by selectively using the corresponding margin values for the hue signals comprises:
selectively using the margin values if the corresponding maximum values are greater than the corresponding margin values; and
selectively using the maximum values if the corresponding maximum values are less than the corresponding margin values.
5. The method of claim 1, wherein each of the input image signals and the output image signals comprises an R signal corresponding to a red hue, a G signal corresponding to a green hue, and a B signal corresponding to a blue hue.
6. The method of claim 1, wherein the converting of the color space based on the input image signals comprises:
converting each input image signal to the corresponding hue signal according to:
H
=
{
60
\xd7
(
G
\ue89e
\ue89e
i
–
B
\ue89e
\ue89e
i
MAX
–
MIN
)
(
When
\ue89e
\ue89e
MAX
=
R
\ue89e
\ue89e
i
)
60
\xd7
(
2
+
R
\ue89e
\ue89e
i
–
B
\ue89e
\ue89e
i
MAX
–
MIN
)
(
When
\ue89e
\ue89e
MAX
=
G
\ue89e
\ue89e
i
)
60
\xd7
(
4
+
G
\ue89e
\ue89e
i
–
R
\ue89e
\ue89e
i
MAX
–
MIN
)
(
When
\ue89e
\ue89e
MAX
=
B
\ue89e
\ue89e
i
)
0
(
When
\ue89e
\ue89e
MAX
=
0
)
;
converting each input image signal to the corresponding saturation signal according to:
S
=
{
0
\ue89e
\ue89e
(
When
\ue89e
\ue89e
MAX
=
0
)
MAX
–
MIN
MAX
;
and
converting each input image signal to the corresponding first luminance signal according to:
V=MAX,
where Gi is a green hue signal of the input image signal, Bi is a blue hue signal of the input image signal, Ri is a red hue signal of the input image signal, MAX is a maximum value of the R signal, the G signal, and the B signal, MIN is a minimum value of the R signal, the G signal, and the B signal, H is the hue signal, S is the saturation signal, and V is the first luminance signal.
7. The method of claim 1, wherein the setting up of the control values comprises determining each control value according to:
y
=
100
+
p
\xb7
(
x
100
)
2
\ue89e
\ue89e
(
0
\u2264
p
\u2264
100
)
,
where y indicates the control value, p indicates the corresponding margin value, and x indicates a value of the corresponding saturation signal.
8. The method of claim 1, wherein the setting up of the control values comprises determining each control value according to:
y=1.0+p\xb7x2(0\u2266p\u22661.0),
where y indicates the control value, p indicates the corresponding margin value, and x indicates a value of the corresponding saturation signal.
9. An image signal processing device comprising:
a first color space converting unit which converts a color space based on input image signals and which outputs hue signals, saturation signals, and first luminance signals for the plurality of pixels of an image based on the input image signals;
a margin value calculating unit which calculates margin values indicating margins with respect to maximum brightnesses for the corresponding hue signals;
a control value set up unit which sets up control values for controlling the corresponding first luminance signals based on the corresponding saturation signals and the corresponding margin values;
a brightness adjusting unit which adjusts brightnesses of the first luminance signals based on the first luminance signals and the corresponding control values, and which outputs second luminance signals with the adjusted brightnesses; and
a second color space converting unit which converts a color space based on the hue signals, the saturation signals, and the second luminance signals and which outputs output image signals having the converted color space.
10. The image signal processing device of claim 9, wherein each of the input image signals and the output image signals comprises an R signal corresponding to a red hue, a G signal corresponding to a green hue, and a B signal corresponding to a blue hue.
11. The image signal processing device of claim 9, wherein the brightness adjusting unit adjusts the brightnesses of the first luminance signals by multiplying the corresponding control values by the first luminance signals.
12. The image signal processing device of claim 9, wherein:
the control value set up unit sets up the control values based on maximum defining information including maximum values for defining maximums of control values for the corresponding hue signals; and
the control value set up unit compares the margin values and the maximum values, and sets up the control values by selectively using the corresponding margin values if the corresponding maximum values are greater than the corresponding margin values and sets up the control values by selectively using the corresponding maximum values if the corresponding maximum values are less than the corresponding margin values.
13. A computer-readable recording medium storing a computer program implemented by a computer to execute a method of processing an image, the method comprising:
converting a color space based on input image signals respectively corresponding to a plurality of pixels of the image, each of which comprises an R signal corresponding to a red hue, a G signal corresponding to a green hue, and a B signal corresponding to a blue hue, and outputting hue signals, saturation signals, and first luminance signals for the plurality of pixels of the image based on the corresponding input image signals;
calculating margin values indicating margins with respect to maximum brightnesses, for the corresponding hue signals;
setting up control values for controlling the first luminance signals based on the corresponding saturation signals and the corresponding margin values;
adjusting brightnesses of the first luminance signals based on the first luminance signals and the corresponding control values and outputting second luminance signals with the adjusted brightnesses; and
converting a color space based on the hue signals, the saturation signals, and the second luminance signals and outputting output image signals, each of which includes an R signal, a G signal, and a B signal according to the converted color space.
14. An image display device comprising:
an image signal adjusting unit which adjusts gradation of each of a plurality of pixels in respectively corresponding input image signals; and
an image display unit which displays an image based on the image signals adjusted by the image signal adjusting unit,
wherein the image signal adjusting unit comprises:
a first color space converting unit which converts a color space based on the input image signals and which outputs hue signals, saturation signals, and first luminance signals for the plurality of pixels based on the input image signals;
a margin value calculating unit which calculates margin values indicating margins with respect to maximum brightnesses for the corresponding hue signals;
a control value set up unit which sets up control values for controlling the corresponding first luminance signals based on the corresponding saturation signals and the corresponding margin values;
a brightness adjusting unit which adjusts brightnesses of the first luminance signals based on the first luminance signals and the corresponding control values, and which outputs second luminance signals with the adjusted brightnesses; and
a second color space converting unit which converts a color space based on the hue signals, the saturation signals, and the second luminance signals and which outputs output image signals having the converted color space to the image display unit.
15. The image display device of claim 14, wherein each of the input image signals and the output image signals comprises an R signal corresponding to a red hue, a G signal corresponding to a green hue, and a B signal corresponding to a blue hue.
16. The image display device of claim 14, wherein the image display unit comprises:
a display unit which displays the image indicated by the output image signals;
a row driving unit and a column driving unit which apply voltages signals to the plurality of pixels in the display unit, such that each of the pixels emits light; and
a display control unit which inputs control signals to the row driving unit or the column driving unit to apply voltages for turning the pixels on or off according to the output image signals adjusted by the image signal adjusting unit.
17. The image display device of claim 14, wherein the control value set up unit sets up the control values based on the corresponding margin values, the corresponding saturation signals, and corresponding maximum defining information.
18. The image display device of claim 14, wherein the brightness adjusting unit adjusts the brightnesses of the first luminance signals by multiplying the corresponding control values by the first luminance signal.
19. A method of processing an image, the method comprising:
converting a color space based on input image signals respectively corresponding to a plurality of pixels of the image and outputting hue signals, saturation signals, and first luminance signals based on the input image signals;
adjusting brightnesses of the first luminance signals based on the corresponding saturation signals and corresponding margin values indicating margins with respect to maximum brightnesses for the corresponding hue signals, and outputting second luminance signals with the adjusted brightnesses; and
converting a color space based on the hue signals, the saturation signals, and the second luminance signals and outputting output image signals having the converted color space.
20. A computer readable recording medium having recorded thereon a program executable by a computer for performing the method of claim 19.