Samsung Display Co., Ltd.

Tae Kwon Jung

Byungchoon Yang

Yong-Hoon Kwon

Dae-Gwang Jang

Hak-Mo Choi

Dongmin Yeo

Min Ha Keum

Gak Seok Lee

Youn Hak Jeong

Jaehyoung Park

Kichul Shin

Haksun Chang

Donghak Pyo

Dong Hak Pyo

A plurality of gray-scale values is extracted from image signals corresponding to a dimming area to calculate a mean value of the gray-scale values, and at least one of a variance, a standard deviation, a kurtosis, a skewness, a central moment, and an image moment is calculated using the mean value. Then, a representative gray-scale value corresponding to the dimming area is determined using the calculated values, and a dimming function for the light sources included in the dimming area is determined based on the representative gray-scale value. Then, the light sources included in the dimming area are driven based on the dimming function.

Method of dimming backlight assembly

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.

Method for driving liquid crystal display device

A display apparatus includes a shutter panel and a display panel that alternately displays a left-eye image and a right-eye image in a 3D mode. The shutter panel includes dual-frequency liquid crystals in which a polarity of dielectric constant anisotropy is changed according to a frequency of the driving voltage to selectively delay a phase of the left-eye image or the right-eye image, which pass through the dual-frequency liquid crystals. The dual-frequency liquid crystals have a fast response speed to the low voltage, and thus a cross-talk phenomenon between the left-eye image and the right-eye image may be prevented.

Display apparatus

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Asan-si, South Korea

Tae Kwon Jung