Integrated amorphous silicon photoconductive type image sensor

Shen, Deyan; Ogura, H.

doi:10.1109/secon.1992.202370

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…Amorphous-silicon possesses well known photosensitive properties. 4,5 a-Si:H is an excellent material from the viewpoint of high photosensitivity in the visible-light region, short response time, thermal stability, low process temperature, and high production yield. We considered three candidates for an integrated panel sensor, namely, TFT, photodiode, and photoconductive sensors.…”

Section: Sensor Selectionmentioning

confidence: 99%

LED-backlight feedback control system with integrated amorphous-silicon color sensor on an LCD panel

Lee¹,

Moon²,

Berkeley³

et al. 2006

J. Soc. Inf. Display

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Abstract— Thin‐film‐transistor liquid‐crystal displays (TFT‐LCDs) have the largest market share of all digital flat‐panel displays. An LCD backlighting system employing a three‐color red‐green‐blue light‐emitting diode (RGB‐LED) array is very attractive, considering its wide color gamut, tunable white point, high dimming ratio, long lifetime, and environmental compatibility. But the high‐intensity LED has problems with thermal stability and degradation of brightness over time. Color and white luminance levels are not stable over a wide range of temperature due to inherent long‐term aging characteristics. In order to minimize color point and brightness differences over time, optical feedback control is the key technology for any LED‐backlight system. In this paper, the feasibility of an optical color‐sensing feedback system for an LED backlight by integrating the amorphous‐silicon (a‐Si) color sensor onto the LCD panel will be presented. To minimize the photoconductivity degradation of a‐Si, a new laser exposure treatment has been applied. The integrated color‐sensor optical‐feedback‐controlled LED‐backlight system minimized the color variation to less than 0.008 Δu'v' (CIE1976) compared to 0.025 for an open‐loop system over the temperature range of 42–76°C.

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Section: Sensor Selectionmentioning

confidence: 99%