Sanyo Electric Co., Ltd.

Samsung Display Co., Ltd.

Samsung Electronics Co., Ltd.

Ryoichi Yokoyama

Michiru Senda

Yasushi Miyajima

Koji Hirosawa

Kiyoshi Yoneda

Tsutomu Yamada

Yusuke Tsutsui

Naoaki Komiya

Ryuji Nishikawa

Shoichiro Matsumoto

Masayuki Koga

Hiroshi Matsuda

Yasuo Segawa

Mitsugu Kobayashi

Yasuhiro Takeda

Keiichi Sano

Hisao Uehara

Masahiro Okuyama

Katsuya Anzai

Yoshinori Saito

Tsutomu Uemoto

Koji Yamano

Takeo Yoshimura

Isao Akima

Kuni Yamamura

Norio Nakatani

A liquid crystal display includes a plurality of pixels, each of which includes a thin film transistor (TFT), a gate line supplying a driving signal to a gate of the TFT of each pixel, a liquid crystal capacitor included in each pixel and connected to one terminal of the TFT in a corresponding pixel, a sub-capacitor line aligned in parallel to the gate line, a sub-capacitor included in each pixel and connected between one terminal of the TFT in a corresponding pixel and the sub-capacitor line, and a driving circuit having at least four voltages, selecting one of the voltages and supplying the selected voltage to the sub-capacitor line to drive the liquid crystal display in a state in which the liquid crystal capacitor is capacitively coupled to the sub-capacitor.

Liquid crystal display

A liquid crystal display includes a plurality of gate lines having odd-numbered gate lines and even-numbered gate lines, a plurality of source lines, a first gate driver which drives the odd-numbered gate lines, a second gate driver which drives the even-numbered gate lines and a driving controller which outputs an overdriven image signal in at least one driving period of a plurality of driving periods and outputs a normal image signal in remaining driving periods of the plurality of driving periods. The overdriven image signal is obtained by adding an overdrive voltage to the normal image signal, and the overdrive voltage is set according to a level of the normal image signal.

A liquid crystal display includes a pixel group including a first pixel having a first thin film transistor and a second pixel having a second thin film transistor. A gate line provides a driving signal to a gate of the first and second thin film transistors. A first storage capacitor line is arranged substantially parallel with the gate line and adjacent to one side of the first pixel. A second storage capacitor line is arranged substantially parallel with the gate line and adjacent to an opposite side of the first pixel. The liquid crystal display includes a first storage capacitor arranged in the first pixel and connected between the first thin film transistor and the first storage capacitor line. A second storage capacitor is arranged in the second pixel and is connected between the second thin film transistor and the second storage capacitor line.

Liquid crystal display with an increased aperture ratio

A small or middle-sized liquid crystal display employing a black insertion driving method overcomes the after-image or blurring of a moving picture by shifting the level of a voltage applied to a storage capacitor line within a predetermined period corresponding to about 20% to about 80% that lasts after image signals are applied to pixels until the next image signals are applied to the pixels by using two types of voltages that shift pixel voltages into a black display potential.

A liquid crystal display having an improved pixel aperture ratio includes vertical scan lines disposed between adjacent pixels, video signal lines disposed between adjacent pixels, and sub-capacitor lines disposed between adjacent pixels while regularly and repeatedly crossing the vertical scan lines.

Liquid crystal display with an increased aperture ration

In a liquid crystal display device includes; a plurality of pixels arranged substantially in a matrix pattern; wherein each of the plurality of pixel includes; first and second thin film transistors including current paths connected to a source line in series, a storage capacitor line, a first capacitor connected between the first and second thin film transistors and connected to the storage capacitor line, a second capacitor connected between one of the source and the drain of the second thin film transistor and a pixel electrode and connected to the storage capacitor line, and a third capacitor including the pixel electrode, a common electrode, and a liquid crystal between the pixel electrode and the common electrode, wherein an overdrive voltage Vover satisfying equation is added to a display signal voltage Vsig and a resultant voltage is applied to the source line.

Liquid crystal display device, method of driving the same, and method of manufacturing the same

A voltage boosting circuit performs variable frequency control that gradually increases frequencies of clock signals from a low frequency to a high frequency during a boosting operation period for which a low output voltage of a DC-DC converter when the power is turned on is boosted up to a predetermined voltage. Thus, the frequencies of clock signals may be set according to the boosting operation of the DC-DC converter. Consequently, the operation of the DC-DC converter may be stabilized until the stable operation period is performed after the DC-DC converter starts to operate.

Voltage boosting circuit, voltage boosting/dropping circuit and LCD

The level of a storage capacitor line is changed between two types, an H level and an L level. As a result of this change, the voltage applied to a liquid crystal is shifted so that a sufficient voltage is applied to the liquid crystal to perform a display operation. Then, at least one of two voltage levels of the storage capacitor line is used in common with the potential of at least one of plurality of voltage levels which are used in vertical driver which drives the said selection line. Furthermore, the values of the storage capacitance and parasitic capacitance for the storage capacitor line are set within a specific range.

Display device

The level of a storage capacitor line changes between two types, an H level and an L level. As a result of this change, the voltage applied to a liquid crystal is shifted so that a sufficient voltage is applied to the liquid crystal to perform a display operation. Then, by changing the voltage value of the difference between a first level and a second level, the contrast and screen brightness are adjusted. Furthermore, the capacitances generated at the locations where the two storage capacitor lines and the data line intersect are set to be substantially the same.

A plurality of gate lines () connected to a gate driver () for supplying gate signals and a plurality of drain lines () connected to a drain driver () for supplying drain signals are provided on a substrate (). Pixels () are formed in the regions surrounded by these lines. Each of the pixels () includes a TFT (), a storing circuit () connected to the source () of the TFT () for storing a digital signal, and a signal selector () for selecting a signal A or signal B in response to the signal stored in the storing circuit () and supplying the selected signal to a display electrode (). Once a digital signal corresponding to a display image is written to the storing circuit () of each pixel (), an image can be continuously displayed, even when operation of the drivers () is stopped from the next frame, by continuing the operation of the storing circuit (). Because the driver operation or the like can be suspended, overall power consumption can be reduced.

Power consumption of display apparatus during still image display mode

This invention provides a liquid crystal display device where an excellent display can be obtained by using a supplemental capacitance coupling driving method. When at least either one of voltages of a pixel electrode for a common electrode before or after a potential of a supplemental capacitance line is changed lies within a transition region R as a region of voltages which largely change a liquid crystal capacitance C, correction of an image signal is performed by adding a changing amount of the potential of the pixel electrode by using Cadded with Cafter changed. This is because that Cas one of components of Cin an amount (C/C)&#xd7;&#x394;V of the potential change of the pixel electrode caused by the potential change of the supplemental capacitance line changes.

Liquid crystal display device and controlling method thereof

A liquid crystal display ('LCD') includes a first voltage shift circuit at a front stage of an inverter circuit. The first voltage shift circuit includes a second transistor having a source serving as an input, and a gate and drain connected to each other, and is operated as a diode, and a first transistor having a source connected to a power supply, a gate connected to a ground, and a drain connected to the drain of the second transistor. An input signal shifts voltage by a threshold of the second transistor, and then is input into the inverter circuit. Further, a first condenser is inserted between an input node and the gate of the second transistor. Therefore, the LCD has a level shift circuit with a small circuit area and a rapid response speed.

Level shift circuit and display device having the same

The retaining circuit, which retains the digital image signal fed from the drain signal linein response to the signal inputted from gate signal line, is formed. The signal selection circuit, which selects one of the two signals (signal A or signal B) in response to the signal from the retaining circuitand which supplies the selected signal to the display electrode, is formed. Also, the reference voltage generation circuit, which provides the signal A and signal B, is formed within the display panel. When the display device is under the digital display mode, the reference voltage generation circuitprepares the signal fed to the display electrode. Thus, there is no need to supply the signal A or signal B from outside, resulting in the simpler configuration of the external circuits. Also, since the drive of the external circuits can be completely halted under the digital display mode, it is possible to further reduce the consumption of the electric power.

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Ogaki, Japan

Ryoichi Yokoyama