Skhynix Inc.

Samsung Electronics Co., Ltd.

Kyoung Hwan Kwon

Sang Kwon Lee

Tae Jin Kang

Sang Hoon Lee

Sang-min Lee

Junho Park

Soo Yong Kim

Chang-Ju Lee

Jun Ho Huh

Seongmin Cheon

Young-Bae Moon

A display driver integrated circuit, System-On-Chip, and display system including the System-On-Chip are provided. A display driver integrated circuit (IC) includes: a clock generator configured to generate an internal operating clock; and a control circuit configured to provide a data signal to a pixel array based on the internal operating clock, wherein the data signal corresponds to frame data, wherein the control circuit is further configured to, in a frame data update period: receive first frame data, perform a first synchronization operation on the internal operating clock based on the first frame data, and provide a first data signal to the pixel array, and wherein the control circuit is further configured to, in a low power mode (LPM) period when an update of the frame data is not performed: transmit a sync request signal based on a result of monitoring a state of a display panel, receive a frequency signal from a System-on-Chip (SoC) in response to the sync request signal, and perform a second synchronization operation on the internal operating clock based on the frequency signal.

Display driver integrated circuit, system-on-chip, and display system including the system-on-chip

A display driver circuit includes a source driver configured to output display data to data lines, a controller configured to control the source driver, based on a synchronization signal, and a frequency adjusting circuit configured to extend a first time interval of the synchronization signal from a first length to a second length, such that time interval in which the display data is not output to the data lines is extended, when second image data are not received from an external device during a reference time interval after first image data are received from the external device, and shorten the first time interval, from the second length to a third length, when an instruction is received from the external device after the first time interval is extended to the second length.

Display driver circuit for adjusting framerate to reduce power consumption

A data input circuit includes a clock sampling unit, a final clock generation unit, and a write latch signal generation unit. The sampling unit is configured to generate a shifting signal including a pulse generated after a write latency is elapsed, and generate a sampling clock by sampling an internal clock during a burst period from substantially a time when the pulse of the shifting signal is generated. The final clock generation unit is configured to generate a level signal by latching the shifting signal in synchronization with the sampling clock and generate a final clock from the level signal in response to a burst signal. The write latch signal generation unit is configured to generate an enable signal by latching the final clock and generate a write latch signal for latching and outputting aligned data in response to the enable signal.

Data input circuit

A power-up signal generation circuit includes a fixed level transition voltage generation unit, a variable level transition voltage generation unit, a comparison unit, and a selective output unit. The fixed level transition voltage generation unit is configured to generate a fixed level transition voltage changing at a constant level of an external voltage. The variable level transition voltage generation unit is configured to generate a variable level transition voltage changing at a level of an external voltage which varies depending on temperature. The comparison unit is configured to compare the level of the fixed level transition voltage with the level of the variable level transition voltage, and generate a selection signal. The selective output unit is configured to output the fixed level transition voltage or the variable level transition voltage as a power-up signal in response to the selection signal.

Power up signal generation circuit

Growing community of inventors

Seoul, South Korea

Kyoung Hwan Kwon