Samsung Display Co., Ltd.

Dae-Gwang Jang

Seok Ha Hong

Gi Geun Kim

Sang Mi Kim

Hyun Sik Hwang

Ung Gyu Min

Byung Sun Kim

Kyoung Won Lee

Ji Myoung Seo

Hyeon-Yong Jang

Hyuk-Hwan Kim

Hak-Mo Choi

Hyung-ku Kang

Joon-Chul Goh

Bong Hyun You

Yu-Han Bae

Weon-Jun Choe

Young-Soo Hwang

Tae Kwon Jung

Min Ha Keum

Seok-Ha Hong

Kyoung-Phil Kim

Bong-Hyun You

Eun Ho Lee

Byung-Sun Kim

Jong Hee Kim

Kyoung Ho Lim

Cheol Woo Park

Ji-Myoung Seo

Woo Mi Bae

Yun-Jae Park

Sang-Mi Kim

Donghak Pyo

Ho Cheol Kang

Hyun-Sik Hwang

Dong-Hak Pyo

Ha Neul Kim

Sang-Su Han

Dong Hak Pyo

Min-Ha Keum

Seung Seok Nam

Tae-Kwon Jung

An electrostatic discharge protection circuit including: a first electrostatic discharge diode including a cathode to receive a first voltage, and an anode connected to a sensing line; a first switching element to determine the first voltage as a precharging voltage applied to a source terminal of the driving transistor when a sensing operation is performed, and to determine the first voltage as a maximum voltage used in a display panel when the sensing operation is not performed; a second electrostatic discharge diode including a cathode connected to the sensing line, and an anode configured to receive a second voltage; and a second switching element configured to determine the second voltage as the precharging voltage when the sensing operation is performed, and to determine the second voltage as a minimum voltage used in the display panel when the sensing operation is not performed.

Electrostatic discharge protection circuit and organic light emitting display device including the same

An organic light emitting diode display device includes: a display area including a plurality of pixels; a compensation circuit configured to receive a current flowing through the plurality of pixels through a plurality of receiving lines connected to the plurality of pixels, and to generate a compensation value to compensate for deterioration of a driving transistor in each of the plurality of pixels based on the received current; a photo-sensor configured to measure external light to generate a light sensing signal; and a signal controller configured to cause the compensation circuit to generate the compensation value when no external light is incident on the photo-sensor such that the light sensing signal is received at a first voltage level and to perform external compensation to generate an image data signal by applying the compensation value to an image signal received from an external device.

Organic light emitting diode display device and driving method thereof

A controller controls the driving frequency and voltages for a display device. If image data corresponds to a moving picture, the controller drives a data driver and a gate driver at a moving picture frequency. If image data corresponds to a still image, drives the data driver and the gate driver at a still image frequency lower frequency than the moving picture frequency. When the still image is to be displayed, the signal controller also controls leakage current of a thin film transistor of a pixel based on a representative value of the image data, such that positive leakage current applied for a positive data voltage is equal to negative leakage current applied for a negative data voltage.

Display device and driving method thereof

A display device includes a display unit, a common voltage measuring unit, and a signal controller. The display unit include a plurality of pixels, each including a liquid crystal capacitor including a terminal coupled to a common electrode to receive a common voltage and a pixel electrode to receive a gray scale voltage. The common voltage measuring unit measures a change in the common voltage resulting from a coupling between the common electrode and the pixel electrode when a test image including a specific pattern is output to the display unit. The signal controller detects a level of a residual DC voltage of a liquid crystal layer between the common electrode and pixel electrode based on a measured value of the common voltage.

A driving method of a display device includes: determining each of a plurality of pixel rows of the display device as one of a motion picture display pixel row and a still image display pixel row by comparing image data of each of the pixel rows in a current frame and in a previous frame; and driving the motion picture display pixel row with a motion picture frequency and driving the still image display pixel row with a still image display frequency, which is lower than or equal to the motion picture frequency, where a plurality of still image display pixel rows are driven with at least two still image display frequencies.

Display driving method and integrated driving apparatus thereof

A controller for a liquid crystal display includes a data driver and a gate driver. The data driver applies data voltages having different polarities to a first pixel and a second pixel. The gate driver applies different gate-on voltages to a first gate line coupled to the first pixel and a second gate line coupled to the second pixel. The gate-on voltages have at least one of a different width or a different level when at least one of a still image or a moving picture is to be displayed. The different gate-on voltages translate into different pixel charging speeds, which may translate into improvements in the luminance and/or other properties of the display.

Liquid crystal display with enhanced display quality at low frequency and driving method thereof

A display device configured to consume less power is disclosed. In one aspect, the display device includes a display panel comprising a pixel connected to a gate line and a data line, a data driver connected to the data line to apply a data voltage, and a gate driver connected to the gate line to sequentially apply a gate-on voltage. The display device additionally includes a signal controller configured to determine image data as corresponding to one of a motion picture, a still image, and a text screen. Furthermore, the signal controller is configured to drive the display panel, the data driver, and the gate driver at one of a motion picture frequency for displaying the motion picture, a still image frequency lower than the motion picture frequency for displaying the still image, and an ultra-low frequency of about 10 Hz or less for displaying the text screen.

A method of driving a display panel includes detecting a position of a viewer to output a viewer position detection signal, determining whether the position of the viewer is in a first area or in a second area based on the viewer position detection signal to output a viewer position signal, and driving a unit pixel of the display panel using a plurality of gamma values according to the viewer position signal. The first area is less than a reference distance, and the second area is not less than the reference distance. Thus, side visibility of a display apparatus may be improved.

Method of driving a display panel, display panel driving apparatus for performing the method and display apparatus having the display panel driving apparatus

A light source device includes a light source module having a light-emitting block, an image analysis part, a duty ratio calculation part, a duty ratio determination part and a signal generation part. The image analysis part extracts representative luminance data of the light-emitting block based on pixel data. The duty ratio calculation part calculates duty ratio data of the light-emitting block based on the representative luminance data. The duty ratio determination part generates determined duty ratio data of the light-emitting block based on the duty ratio data from a first period, and the signal generation part generates a driving signal having a duty ratio corresponding to the determined duty ratio data to drive the light-emitting block.

Method for adjusting pixel data based on the duty ratio history of the backlight in order to compensate for the temperature of the backlight

A display device includes a display panel, a data driver, a gate driver, and a signal controller. The display panel includes a pixel connected to the gate and data lines, and the pixel includes a liquid crystal capacitor. The signal controller obtains compensation data and normal data based on input data for a still image. The signal controller apples the compensation data and normal data to the pixel during different periods of a frame. The compensation data has a value that reduces a difference of operation characteristics of liquid crystal molecules in the liquid crystal capacitor when a data voltage for the display panel changes between different polarities.

Display device to apply compensation data and driving method thereof

A display panel driving apparatus includes a first switching element and a second switching element. The first switching element applies first pixel data to a first pixel connected with a first data line of a display panel during a first sub frame period. The first switching element is connected with a data channel of a data driving part. The second switching element applies second pixel data having a level higher than a level of the first pixel data to a second pixel connected with a second data line of the display panel during a second sub frame period. The second switching element is connected with the data channel. Thus, display quality of a display apparatus may be enhanced.

Method of driving a display panel using switching elements between data channels and data lines and display panel driving apparatus for performing the method

A display device includes a display panel including a gate line, a data line, and a pixel connected to the gate line and the data line, a data driver connected to the data line, a gate driver connected to the gate line, and a signal controller controlling the data driver and the gate driver, wherein a circuits powering power source voltage that is normally used for driving the data driver is selectively not applied during a new-image blanking time when the signal controller is not supplying image data to the data driver.

The described technology relates to a liquid crystal display and a driving method thereof. The liquid crystal display includes a plurality of pixels arranged in a matrix form. The pixels include a liquid crystal capacitor including a pixel electrode and a common electrode as two terminals. A plurality of data lines transfer data to the plurality of pixels. The pixels include a first pixel and a second pixel, which are adjacent to each other. First and second common signals are applied to the common electrode of the first and second pixels, respectively. The second common signal is inverted to the first common signal. The first and second common signals swing between a first voltage and a second voltage. The polarity of the data voltage transferred by a data line with respect to the first common signal or the second common signal is constant during one frame.

Liquid crystal display and driving method thereof

A display device includes: a display panel which displays an image; a light source unit which provides light to the display panel; and a light source controller which transmits a control signal to the light source unit, wherein the light source unit includes a light source including a plurality of light emission blocks, the light source controller includes a first reference determining unit which determines first references based on an input image signal, a reference difference calculator which calculates at least one reference difference for neighboring light emission blocks by using first references, a parameter generator which generates at least one parameter by using the at least one reference difference, and a second reference determining unit which determines a second reference for a corresponding light emission block by using the first references and the at least one parameter.

Growing community of inventors

Incheon, South Korea

Dae-Gwang Jang