Display device and driving method thereof
First Claim
1. A display device comprising:
- a display panel including a plurality of pixels arranged in a matrix of rows and columns, and switching elements each being connected to a corresponding one of the plurality of pixels;
a row driving circuit for selecting a row in the plurality of pixels by supplying a selection signal to the switching elements;
a column driving circuit for supplying a data signal to pixels connected to the switching elements selected with the selection signal; and
a black display signal generation circuit for generating a black display signal for causing the plurality of pixels to perform a black display;
a backlight; and
a backlight regulation circuit;
whereinthe data signal and the black display signal are supplied to each of the plurality of pixels during a period corresponding to one vertical scanning period;
the display device further includes a black ratio control signal generation circuit that is arranged to generate a black ratio control signal defining a ratio between a second period of retaining the black display signal and a first period of retaining the data signal; and
the backlight regulation circuit adjusts an on luminance of the backlight based on the black ratio control signal.
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Accused Products
Abstract
The display device of the invention includes a display panel including a plurality of pixels arranged in a matrix of rows and columns, and switching elements each being connected to a corresponding one of the plurality of pixels; row driving circuits to for each selecting a row in the plurality of pixels by supplying a selection signal to the switching elements; column driving circuits for each supplying a data signal to pixels connected to the switching elements selected with the selection signal; and a black display signal generation circuit for generating a black display signal for causing the plurality of pixels to perform a black display. The data signal and the black display signal are supplied to each of the plurality of pixels during a period corresponding to one vertical scanning period. The display device further includes a black ratio control signal generation circuit for generating a black ratio control signal defining a ratio between a first period of retaining the data signal and a second period of retaining the black display signal.
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Citations
20 Claims
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1. A display device comprising:
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a display panel including a plurality of pixels arranged in a matrix of rows and columns, and switching elements each being connected to a corresponding one of the plurality of pixels; a row driving circuit for selecting a row in the plurality of pixels by supplying a selection signal to the switching elements; a column driving circuit for supplying a data signal to pixels connected to the switching elements selected with the selection signal; and a black display signal generation circuit for generating a black display signal for causing the plurality of pixels to perform a black display; a backlight; and a backlight regulation circuit;
whereinthe data signal and the black display signal are supplied to each of the plurality of pixels during a period corresponding to one vertical scanning period; the display device further includes a black ratio control signal generation circuit that is arranged to generate a black ratio control signal defining a ratio between a second period of retaining the black display signal and a first period of retaining the data signal; and the backlight regulation circuit adjusts an on luminance of the backlight based on the black ratio control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19)
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14. A display device comprising:
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a display panel including a plurality of pixels arranged in a matrix of rows and columns, and switching elements each being connected to a corresponding one of the plurality of pixels; a row driving circuit for selecting a row in the plurality of pixels by supplying a selection signal to the switching elements; a column driving circuit for supplying a data signal to pixels connected to the switching elements selected with the selection signal; and a black display signal generation circuit for generating a black display signal for causing the plurality of pixels to perform a black display;
whereinthe data signal and the black display signal are supplied to each of the plurality of pixels during a period corresponding to one vertical scanning period; the display device further includes a black ratio control signal generation circuit that is arranged to generate a black ratio control signal defining a ratio between a second period of retaining the black display signal and a first period of retaining the data signal; the black ratio control signal generation circuit generates the black ratio control signal so as to define a black ratio which is greater than a predetermined reference value, and the backlight regulation circuit adjusts the luminance of the backlight to be less than a predetermined reference value; and the display device gives a higher priority to a luminance adjustment through increasing the black ratio, than to the backlight luminance adjustment.
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20. A driving method for a display device having a display panel including a plurality of pixels arranged in a matrix of rows and columns and a backlight, the method comprising the steps of:
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during a period corresponding to one vertical scanning period, supplying a data signal for each of the plurality of pixels and supplying a black display signal for each of the plurality of pixels, determining a ratio between a second period of retaining the black display signal in each of the plurality of pixels and a first period of retaining the data signal in each of the plurality of pixels; and adjusting a luminance of the backlight based on the ratio between the second period and the first period.
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Specification