Samsung Display Co., Ltd.

Suhyeong Park

Hoyong Jung

Cheolwoo Park

Kyoungwon Lee

Jimyoung Seo

Bonghyun You

Heesoon Jeong

Taehyeong An

Soowan Yoon

Sangik Lee

Nam-Gon Choi

Young-soo Yoon

Soo-wan Yoon

Hyundae Lee

Sangmi Kim

Unggyu Min

A gate driver includes a plurality of stages. A present stage among the plurality of stages is configured to receive a clock signal, a scan signal of a previous stage among the plurality of stages that is before the present stage, a first initialization voltage and a second initialization voltage different from the first initialization voltage and to generate a scan signal of the present stage and a initialization signal of the present stage based on the clock signal, the scan signal of the previous stage, the first initialization voltage and the second initialization voltage. The initialization signal of the present stage is varied between the first initialization voltage and the second initialization voltage according to time.

Gate driver, display apparatus having the same and method of driving display panel using the same

A display apparatus includes a display panel and a power supply. The display panel displays an image at a first driving frequency in a normal mode and displays an image at a second driving frequency in a low power mode. The second driving frequency is lower than the first driving frequency. The power supply outputs a first initialization voltage at a first level to the display panel during an active period of the low power mode. The power supply outputs a second initialization voltage at a second level to the display panel during at least a portion of a blank period of the low power mode. The second level is higher than the first level.

Organic light emitting display apparatus

A display apparatus includes: a timing control block which outputs image data based on external image data and control signals, and generates data and gate-side control signals based on the external control signal; a source drive block which converts the image data into a data voltage based on the data control signal; a low frequency detection block which detects a low power drive period based on the external control signal and generates a power control signal, a state of which is determined based on a result of the detection; an integrated chip which receives first and second drive voltages and includes a first switch block that turns off a circuit of the source drive block based on the power control signal during the low power drive period; a gate drive circuit which generates a gate signal based on a gate control signal from the integrated chip; and a display panel.

Display apparatus

A display device includes a buffer connected to a data line of a display panel, a bias-mode verification unit which generates a bias-mode signal based on an nimage data signal and an mimage data signal ('m' is a natural number smaller than 'n') corresponding to the data line, a data selecting unit which selects one of a plurality of bias enable signals having different duty ratios from one another based on the bias-mode signal, a control signal generating unit which generates a switching control signal based on the bias enable signal selected by the data selecting unit, and a bias control unit which applies, to the buffer, at least one of a plurality of bias control signals having different levels from one another in an output period defined by the switching control signal.

Display device and method for driving the same

A data driver includes buffers, bias circuits, and a bias signal generator. The buffers respectively output data voltages corresponding to pixel image data. The bias circuits generate bias currents independent of each other and apply the bias currents to respective ones of the buffers. The bias signal generator generates a plurality of bias signals. Each of the bias circuits include a selector and a bias current generator. The selector selects one bias signal among the bias signals based on corresponding pixel image data and outputs the selected bias signal as a final bias signal. The bias current generator generates a corresponding bias current among the bias currents based on the final bias signal.

Data driver and method of driving the same

A display apparatus includes a latch circuit configured to generate a second data value from a first data value, wherein the bit count of the second data value is greater than the bit count of the first data value, a digital-analog converter configured to convert the second data value into gray scale voltages, an output buffer unit configured to amplify the current level of the gray scale voltages to generate data voltages, a data switch circuit configured to invert the polarity of the data voltages every frame, and a display panel including a plurality of pixels driven with the data voltages supplied from the data switch circuit in response to sequential application of gate signals.

Display apparatus having a data driver for reducing driving data

A display apparatus includes a display panel and a driving circuit. The display panel includes pixels. Each of the pixels is connected to one of gate lines and one of data lines. The driving circuit drives the gate lines and the data lines to display an image on the display panel. The driving circuit alternately provides a first polarity data driving signal and a second polarity data driving signal to each of the plurality of data lines. During an asymmetrical mode, the first polarity data driving signal is provided to first data lines of the data lines during a first frame period before a blank period begins, and the second polarity data driving signal is provided to the first data lines during a second frame period after the blank period ends. The second frame period excludes the blank period.

Liquid crystal display apparatus

Display apparatus and method of driving the same

A display apparatus includes a display panel configured to display an image, a data driver including a voltage generator configured to convert an image data applied thereto to a data voltage and a buffer configured to apply the data voltage to the display panel, a timing controller including a mode controller configured to generate a mode selection signal on the basis of an image frame rate of the image data. The data driver is configured to be operated in a power cut-off mode or a stand-by mode in response to the mode selection signal. The driving voltage switch is configured to cut off the analog driving voltage applied to at least one of the buffer and the voltage generator during the power cut-off mode and the bias controller is configured to reduce a bias current in the stand-by mode.

Display apparatus having a data driver operated in a power cut-off mode or a stand-by mode

A display device is provided. The display device includes a display panel, a gate driver, and a data driver. The display panel includes a plurality of pixels connected to a plurality of gate lines for receiving gate signals, a plurality of data lines for receiving data voltages, and a storage line for receiving a storage voltage. The gate driver is configured to generate the gate signals. The data driver is configured to operate individually in first and second frequency periods to generate the data voltages. The data voltages include a positive data voltage and a negative data voltage, and polarities of the data voltages are inverted every two data lines during the first frequency period and inverted every data line during the second frequency period.

Display device

A data driver includes buffers respectively outputting data voltages corresponding to pixel image data, bias units corresponding to the buffers in a one-to-one correspondence and driving the buffers, respectively, and a global setting part applying control level values to the bias units. Each of the bias units includes a bias signal generating unit that selects one control level value among the control level values based on a corresponding pixel image data among the pixel image data and generates a bias signal having a control level corresponding to the selected control level value and a current generating unit that generates a corresponding bias current in response to the bias signal and applies the corresponding bias current to a corresponding buffer among the buffers.

Data driver and driving method with control of bias current based on pixel image data

A display apparatus includes: a plurality of pixels coupled to gate lines and to data lines configured to cross the gate lines, a gate driver configured to apply gate signals to the gate lines, a first data driver configured to apply first data voltages to first signal lines, a first DEMUX part configured to selectively couple the first signal lines to the data lines, a second data driver configured to apply second data voltages to second signal lines positioned to correspond to the first signal lines, and a second DEMUX part positioned to face the first DEMUX part such that the pixels are positioned between the first and second DEMUX parts, the second DEMUX part configured to couple the second signal lines to the data lines, which are not coupled to the first signal lines. Each of the first data voltages has a polarity opposite to a polarity of a corresponding second data voltage of the second data voltages.

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Gyeongju-si, South Korea

Suhyeong Park