Samsung Display Co., Ltd.

Min Ha Keum

Dae-Gwang Jang

Hak-Mo Choi

Tae Kwon Jung

Donghak Pyo

Dong Hak Pyo

Hyun Ho Lim

A display device includes: a display unit including a plurality of pixels to display an image; a first power supply to generate a first power voltage; a second power supply to generate a second power voltage; and a signal controller to control the first power supply to supply the first power voltage to the display unit in response to at least one control signal associated with luminance of the image, and to control the second power supply to stop supplying the second power voltage after the first power voltage starts to be supplied.

Display device and driving method thereof

A display device includes: organic light emitting diodes configured to emit light depending on grayscales constituting a target frame; a power voltage supplier configured to supply a power voltage to one electrode of each of the organic light emitting diodes; and a power voltage determiner configured to: extract target grayscales in descending order from a highest grayscale among the grayscales; and determine a voltage value of the power voltage based on each number of the target grayscales.

In a display apparatus, a display panel is divided into dimming areas and a backlight device includes light source blocks providing light to the dimming areas. Average gray-scale values and maximum gray-scale values respectively corresponding to the dimming areas are generated based on image signals provided to the dimming areas. Whether the average gray-scale values and the maximum gray-scale values are respectively within first and second reference ranges are checked. One of at least two parameters is selected according to a checked result, and representative brightness values respectively corresponding to the dimming areas are determined using the selected parameter. Duty ratios of the light source blocks are controlled based on the representative brightness values. As a result, power consumption is reduced when applying a dimming device to the display apparatus.

Method of controlling backlight device and display apparatus using the same

A method of driving a light source unit of a liquid crystal display panel according to an exemplary embodiment of the present disclosure includes the steps of calculating average and maximum values of image signals applied to the liquid crystal panel; calculating a representative value of the image signals using the average and maximum values; determining the luminance of the light source unit according to the representative value and driving the light source unit accordingly. The representative value may be calculated from L=(1&#x2212;&#x3b2;)&#xd7;L+&#x3b2;&#xd7;L, where Lis a representative value, Lis an average value, Lis the maximum value, and &#x3b2; is a value that decreases as a difference between the maximum and average image signal values increases, and has a range between 0 and 1.

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Cheonan-si, South Korea

Min Ha Keum