Display unit driving device with reduced power consumption
A driving device for driving a display unit which can reduce power consumption regardless of the type of video data is provided which, based on the type of application software which is the provider of a video data signal, performs either one of a first power saving mode in which to stop power delivery to a data driver and a second power saving mode in which the data driver stops importing of the pixel data sequence signal when the 1-H line data's respectively corresponding to neighboring ones of horizontal scan lines of the display unit coincide with each other.
1. A driving device for driving a display unit, to thereby cause the display unit to display a sequence of images corresponding to a video data signal, the displaying unit having m horizontal scan lines and n data lines, m and n each being an integer larger than 1, the driving device comprising:
a drive controller configured to generate a pixel data sequence signal that corresponds to luminance levels of pixels of the sequence of images, and that includes a series of frame data pieces, each frame data piece including m pieces of line data respectively corresponding to the m horizontal scan lines; and
a data driver configured to import the pixel data sequence signal, and to apply, to the n data lines, pixel drive voltages corresponding to the luminance levels denoted by the pixel data sequence signal,
wherein the drive controller is configured
to determine whether the video data signal is provided by a still-image provider or by a moving-image provider,
upon determining that the video data signal is provided by a still-image provider, to cause the data driver to operate in a first power saving mode in which power supply to the data driver is stopped, and
upon determining that the video data signal is provided by a moving-image provider, to cause the data driver to operate in a second power saving mode, in which the data driver stops importing the pixel data sequence signal in response to coincidence of two neighboring pieces of the line data that correspond to two neighboring ones of the m horizontal scan lines.
2. A driving device for driving a display unit according to claim 1 , wherein in the first power saving mode, after transmitting one frame worth of the pixel data sequence signal to the data driver, the drive controller stops transmitting the pixel data sequence signal to the data driver.
3. A driving device for driving a display unit according to claim 1 , further comprising a power switch that supplies a source voltage to the data driver,
wherein the drive controller causes the power switch to stop supplying the source voltage to the data driver in the first power saving mode.
4. A driving device for driving a display unit that has
a screen that is dividable into a plurality of displaying areas, and
m horizontal scan lines and n data lines, m and n each being an integer larger than 1,
to thereby display a sequence of images corresponding to a video data signal from a provider, the sequence of images being dividable into a plurality of sequences of image portions, each image portion sequence being a still-image portion sequence or a moving-image portion sequence, the provider having a displaying attribute associated thereto for displaying one of the still-image portion sequence and the moving-image portion sequence in each of the displaying areas, the driving device comprising:
a drive controller configured to generate a pixel data sequence signal that corresponds to luminance levels of pixels of the sequence of images, and that includes a series of frame data pieces, each frame data piece including m pieces of line data respectively corresponding to the m horizontal scan lines; and
a plurality of data drivers, each configured to import the pixel data sequence signal, and to apply, respectively to a different subset of the n data lines, pixel drive voltages corresponding to the luminance levels denoted by the pixel data sequence signal, wherein
the drive controller is configured
to determine the displaying attribute of the provider, and
to cause each of the data drivers to operate in
a first power saving mode in which power supply to said each data driver is stopped, or
a second power saving mode, in which said each data driver stops importing the pixel data sequence signal in response to coincidence of two neighboring pieces of the line data that correspond to two neighboring ones of the m horizontal scan lines,
respectively in accordance with whether the still-image portion sequence or the moving-image portion sequence is displayed in the displaying area corresponding to the subset of the data lines of said each data driver, as indicated by the displaying attribute.
5. A driving device for driving a display unit according to claim 4 , wherein, in the first power saving mode of each data driver, after transmitting one frame worth of the pixel data sequence signal to the data driver, the drive controller stops transmitting the pixel data sequence signal to the data driver.
6. A driving device for driving a display unit according to claim 4 , wherein the plurality of displaying areas include two areas arranged left and right to each other.
7. A driving device for driving a display unit according to claim 5 , wherein the plurality of displaying areas include two areas arranged left and right to each other.
8. A driving device for driving a display unit according to claim 4 , wherein
in the still-image portion sequence, any two neighboring image portions are substantially identical to each other, and
in the moving-image portion sequence, no neighboring image portions are substantially identical to each other.