Abstract: Provided is a liquid crystal display panel having gate drivers. The LCD panel includes a gate line shift circuit setting a gate line scanning order such that the gate lines are sequentially scanned in units of n gate lines with k-1 gate lines between each pair of adjacent gate lines in each unit according to an interleaving method in response to a gate line-on signal received from a timing control unit outside the LCD panel, wherein the LCD panel reproduces source data output from a source driver outside the LCD panel in the gate line scanning order set by the gate line shift circuit. The LCD panel inverts the polarity of a common voltage for every unit of n gate lines, instead of every gate line, thereby reducing power consumption. In addition, since every kth gate line is scanned according to the interleaving method, deterioration of image quality such as a flickering phenomenon can be prevented, which is an advantage of a line inversion driving method.

Abstract: Provided is a display device capable of detecting battery removal and a method of removing a latent image from a panel. The display device includes a panel, and a driver unit displaying an image on the panel, wherein the driver unit comprises: a controller, generating a control signal and color data in response to a first power supply voltage; a voltage generator, generating control voltages in response to the control signal and a second power supply voltage; a voltage level controller, receiving the control voltages, outputting the control voltages in a first operation mode, and outputting the control voltages as first-level voltages in a second operation mode; and a source driver and a gate driver, controlling source lines and gate lines of the panel, respectively, in response to the color data, the control signal, and the control voltages.

Abstract: A power supply voltage-independent and temperature-independent RC oscillator using a controllable Schmitt trigger comprises a transition voltage generator circuit, a Schmitt trigger circuit, an RC delay circuit, and a quantizer. The transition voltage generator circuit generates a high transition voltage and a low transition voltage. The high and low transition voltages are proportional to a power supply voltage. The Schmitt trigger circuit generates an output voltage having a first level when an input voltage becomes greater than the high transition voltage and having a second level when the input voltage becomes less than the low transition voltage. The RC delay circuit comprises a resistor and a capacitor and generates the input voltage in response to the output voltage. The quantizer quantizes the input voltage to output a square-wave oscillation signal. Accordingly, an oscillation signal having a stable oscillation frequency unaffected by the external conditions can be obtained.

Abstract: A power supply voltage-independent and temperature-independent RC oscillator using a controllable Schmitt trigger comprises a transition voltage generator circuit, a Schmitt trigger circuit, an RC delay circuit, and a quantizer. The transition voltage generator circuit generates a high transition voltage and a low transition voltage. The high and low transition voltages are proportional to a power supply voltage. The Schmitt trigger circuit generates an output voltage having a first level when an input voltage becomes greater than the high transition voltage and having a second level when the input voltage becomes less than the low transition voltage. The RC delay circuit comprises a resistor and a capacitor and generates the input voltage in response to the output voltage. The quantizer quantizes the input voltage to output a square-wave oscillation signal. Accordingly, an oscillation signal having a stable oscillation frequency unaffected by the external conditions can be obtained.

Abstract: Provided are a circuit and method for driving a liquid crystal display device using low power. The circuit includes a display data latch, a gamma decoder, and a driver cell circuit. The display data latch latches display data from a memory. The gamma decoder receives a plurality of gray scale voltages, and selects and outputs one of the plurality of gray scale voltages in response to the display data. The driver cell circuit receives an output voltage of the gamma decoder and generates an output voltage applied to the liquid crystal display device. The driver cell circuit controls a slew rate in response to comparison result of current data and previous data of the display data. The driver cell circuit includes a previous data latch, a bias control voltage generator, and a driver amplifier. The previous data latch receives a portion or the whole of the display data and outputs the portion or the whole of the display data as the previous data.

Abstract: A data transmission circuit in which leakage current is not generated during transmission of data and a method of transmitting data using the same. The data transmission circuit, which has input and output terminals and transmits data input to the input terminal to the output terminal, comprises a control circuit generating a control signal; and a transmission circuit pulling up the level of the output terminal to the level of a power source voltage or transmitting the data to the output terminal, in response to the control signal. The transmission circuit pulls up the level of the output terminal to the level of the power source voltage in response to the control signal having a logic high level, irrespective of whether the data is being input to the input terminal or the input terminal is open. Also, the transmission circuit transmits the data to the output terminal in response to the control signal having a logic low level.