Design and Simulation of the Pixel Circuit for a 6-in Full HD LTPS TFT LCD Based on the New Digital Driving Method

New Driving Structure to Increase Pixel Charging Ratio for UHD TFT-LCDs With High Frame Rate

“…Many studies have developed various methods to reduce the number of source and gate driver ICs, achieve low power consumption, and improve pixel charging to satisfy the requirements of high-resolution displays; these involve enhancing the performance of pixel driving schemes [19], [20], new driving structures [21]- [25], and TFT devices [26], [27]. Tai et al proposed a new pixel circuit for TFT-LCDs that was based on a digital pulse width modulation (PWM) method [21]; it has no operational amplifiers (OP AMPs) and resistor-string digital-to-analog converters (R-DACs), reducing the power consumption of the source driver ICs.…”

“…Many studies have developed various methods to reduce the number of source and gate driver ICs, achieve low power consumption, and improve pixel charging to satisfy the requirements of high-resolution displays; these involve enhancing the performance of pixel driving schemes [19], [20], new driving structures [21]- [25], and TFT devices [26], [27]. Tai et al proposed a new pixel circuit for TFT-LCDs that was based on a digital pulse width modulation (PWM) method [21]; it has no operational amplifiers (OP AMPs) and resistor-string digital-to-analog converters (R-DACs), reducing the power consumption of the source driver ICs. However, the inserted resistor in the pixel circuit is difficult to be patterned in a sophisticated manner with TFT backplane technologies, and the RC time constant is affected by the non-uniformity of resistance, threshold voltage (V TH ) variations, and the dynamic capacitance of liquid crystal, making control of the pixel voltage difficult.…”