A new precharging method without side effects for liquid crystal displays with insufficient charging time

Abstract

In this paper, a new precharging method without any side effects is proposed to overcome image degradation caused by insufficient charging times. This work explains why the precharging method can compensate for short charging times. However, side effects of the precharging method in the form of horizontal line artifacts are addressed, wherein line artifactcompensating precharging (LCP) is presented to mitigate the side effects. Behavioral modeling is employed to investigate the side effects by estimating transient responses of a liquid crystal display. The LCP proves that it can dramatically reduce line artifacts caused by precharging because the brightness difference of adjacent pixels does not exceed 1.0.

67.2: A Novel Driving Method to Compensate for RC Delay of Ultra‐Large Size and High Resolution Liquid Crystal Displays

“…The pre-charging method helps the pixel to be charged sufficiently and this is achieved by increasing the pixel charging time [3]. To extend the time for charging pixels, one-line time should be increased.…”

Line‐time optimization technology for ultra‐large and high‐resolution liquid crystal displays

“…Precharging is one of the methods used to compensate for insufficient charging times . In the precharging method, each pixel is additionally charged at a previous line time, which results in an increase in the net charging time.…”

“…Precharging is one of the methods used to compensate for insufficient charging times. 11 In the precharging method, each pixel is additionally charged at a previous line time, which results in an increase in the net charging time. Therefore, the insufficient charging time resulting from the increased resolution or higher frame rate can be partially compensated by the precharging method.…”

Low power low temperature poly-Si thin-film transistor shift register with DC-type output driver

“…However, the previous DC-type approaches need more than 10 TFTs and additional dummy stages. Furthermore, the output pulses are not allowed to have the variable overlap interval within the range of one line time which is necessary to secure the pixel charging/discharging time without visible artifacts [15,16]. This paper proposes a low power LTPS TFT shift register with a DC-type output stage that reduces the capacitive load of clock signals and provides the variable overlap intervals between neighboring output pulses.…”