Lg Display Co., Ltd.

Jincheol Hong

Jinsung Kim

Suhyuk Jang

Minki Kim

Sungjo Koo

Mangyu Park

A display device includes a source unit; and a sink unit connected with the source unit via an embedded display port interface for signal transmission between the source and sink units and to enable a panel self refresh (PSR) mode for reducing power, wherein, for an input still image, the source unit applies power to a frame buffer of the sink unit and transmits the still image to the sink unit, wherein the sink unit determines whether the still image can be losslessly compressed and stored in the frame buffer, outputs a first control signal if the still image can be losslessly compressed and stored in the frame buffer, and outputs a second control signal if the still image cannot be losslessly compressed and stored, and wherein the source unit activates the PSR mode for the first control signal, and deactivates the PSR mode for the second control signal.

Display device and method for controlling panel self refresh operation thereof

A liquid crystal display and driving method thereof are disclosed. The liquid crystal display according to an embodiment of the invention includes a liquid crystal panel having liquid crystal cells in a matrix array at crossings of data lines and gate lines; a timing controller for receiving a digital video data and synchronous signals, and generating a source output enable signal, a first gate start pulse, a second gate start pulse having a pulse width different from that of the first gate start pulse, a gate shift clock, a first gate output enable signal and a second gate output enable signal; a data driving circuit for providing a data voltage to the data lines in response to a first logic value of the source output enable signal, and any one black gray voltage of a charge share voltage and a precharge voltage to the data lines in response to a second logic value of the source output enable signal; and a gate driving circuit for providing a first gate pulse in synchronization with the data voltage and a second gate pulse in synchronization with the black gray voltage to the gate lines, in response to the first gate start pulse, the second gate start pulse, the gate shift clock, the first gate output enable signal and the second gate output enable signal.

Liquid crystal display and driving method thereof

A liquid crystal display including a liquid crystal display panel including a plurality of data lines, a plurality of gate lines intersecting the data lines, and liquid crystal cells respectively formed at intersections of the data lines and the gate lines, and divided into a first area, a second area and a third area, a first data integrated circuit (IC) that drives the first area, a second data IC that drives the second area, a third data IC that drives the third area, and a timing controller that analyzes an input digital video data, generates a first selection signal and a second selection signal for controlling whether charge sharing is used, and independently controls the first, second, and third data ICs using the first and second selection signals, wherein the second area is divided into a first block adjoining the first area, a third block adjoining the third area and a second block located between the first block and the third block; and the first selection signal controls whether the charge sharing is used for the first and third data ICs, and the second selection signal controls whether the charge sharing is used for the second block and controls a charging delay variation so that the charging delay variation is lessened between the second block and the first area or between the second block and the third area in the first or third block.

Growing community of inventors

Gyeonggi-do, South Korea

Jincheol Hong