Title :
Photosensitive Inverter and Ring Oscillator With Pseudodepletion Mode Load for LCD Applications
Author :
Jin, Sung Hun ; Park, Mun-Soo ; Shur, Michael S.
Author_Institution :
CAE Group, Samsung Electron. Co., Ltd., Yongin, South Korea
Abstract :
Photosensitive inverters and ring oscillators (ROs) with pseudodepletion mode loads (PDMLs) were integrated in LCD panels using conventional mass production processes. The delay time (t pd) of five-stage ROs with PDML reduced from 204.3 ??s under dark to 16.3 ??s under backlight illumination of 20 000 lx. The oscillation frequency exhibited a power-law dependence (f osc ??IL??) on the backlight illuminance with the extracted fitting parameter ?? = 0.447 at room temperature.
Keywords :
invertors; liquid crystal displays; mass production; LCD panel; backlight illuminance; mass production process; photosensitive inverter; power-law dependence; pseudodepletion mode; ring oscillator; temperature 293 K to 298 K; time 16.3 mus; Backlight; noise margin; photosensitive inverters; pseudodepletion mode load (PDML); ring oscillators (ROs);
Journal_Title :
Electron Device Letters, IEEE
DOI :
10.1109/LED.2009.2026716
