11.7 A load-aware pre-emphasis column driver with 27% settling-time reduction in ±18% panel-load RC delay variation for 240Hz UHD flat-panel displays

14‐2: Data‐Line Driver with Gray‐Level‐Dependent Far‐End Auxiliary Driving for Large AMOLED Display Panel

“…The driving method proposed by Bang et al with pre-emphasis and data line parasitic load compensation [4] is shown in Fig. 3a.…”

“…The increase of the display resolution and the frame frequency have significantly reduced the time period for the data line driver to drive the data line to a target voltage. [1][2][3][4][5] proposed pre-emphasis driving method to reduce the settling time of data line. [3] further proposed gray-level dependent pre-emphasis method by adjusting the duration of emphasis period depending on the gray-level change between the current and previous display data.…”

“…This design requires extra hardware cost to generate the programming pre-emphasis pulse for every driving channel. [4][5] found that the settling time of data line is not linearly proportional to the parasitic load of the data line. Actually, the settling time is longer even if the parasitic load is smaller.…”

“…Actually, the settling time is longer even if the parasitic load is smaller. [4] proposed a load-aware preemphasis driving method to compensate the load variation by adjusting the pre-emphasis voltage (or the over-drive voltage). This method requires high voltage designs for each driving channel to detect the variation of parasitic load of each data line.…”

“…The pre-emphasis driving could significantly reduce the settling time, while the both-side (or both-end) driving is even better than the pre-emphasis driving. All the pre-emphasis designs in [1][2][3][4][5] need capacitors or large value resistors to construct a potential divider to feedback a ratio of buffer output voltage to temporarily boost up (or pre-emphasis) the buffer output voltage for each channel. The layout area of these capacitors and high voltage resistors is typically large.…”