P-174L: Late-News Poster: The System-LCD with Monolithic Ambient-Light Sensor System

Maeda, Kengo; Nagai, Takeharu; Sakai, Toshiko; Kuwabara, Nobuhiro; Nishi, Shuji; Satoh, Masakazu; Matsuo, Takami; Kamiya, Shohgo; Katoh, Hiromi; Ohue, Makoto; Kubota, Yasushi; Komiya, H.; Muramatsu, Tetsuroh; Katayama, M.; Zebedee, Patrick; Desumvila, Salvador; Brown, Chris; Walton, Harry; Brownlow, Michael

doi:10.1889/1.2036445

Cited by 24 publications

(19 citation statements)

References 5 publications

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“…Because an LCD panel does not illuminate for itself, the transmissive LCD uses a backlight unit (BLU), which consumes relatively large power in the mobile LCD. To reduce BLU power consumption, and to improve image visibility, there have been many efforts to control BLU brightness, based on ambient-light conditions [1,2,3]. Some of the ambient-light sensor (ALS) systems have been implemented by external chips [1].…”

Section: Introductionmentioning

confidence: 99%

“…However, a monolithic system on a glass substrate is more efficient in reducing the production cost and complexity of a display module. Low-temperature poly-silicon (LTPS) thin film transistors (TFTs) can be used for a monolithic system, which integrates a photo detector, readout circuit and analog-to-digital converter (ADC) on the same glass substrate [2,3].…”

Section: Introductionmentioning

confidence: 99%

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An ambient-light sensor system with startup correction for LTPS-TFT LCD

Nam

Woo

2014

IEICE Electron. Express

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An ambient-light sensor system using low-temperature poly-silicon thin film transistors was studied, to reduce the power consumption of mobile applications. The proposed system with startup correction can correct the panel-to-panel variation of the ambient-light sensors, without additional equipment. The digital output of the readout circuit has 8 levels per decade for the input luminance ranges from 100 to 10000 lux, and the readout rate is 40 Hz. The proposed method provides maximum differential nonuniformity below 0.3 LSB.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An ambient-light sensor system with startup correction for LTPS-TFT LCD

Nam

Woo

2014

IEICE Electron. Express

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“…An adaptive brightness control according to ambient light level has been used in LCD backlights for good visibility and power consumption reduction purpose [1,2]. Generally, PWM circuits have been used in LCD backlight drivers for controlling the brightness of the display panel.…”

Section: Introductionmentioning

confidence: 99%

A switched-capacitor PWM generator for LCD backlight brightness control

Yang

Lee

Kim

et al. 2011

IEICE Electron. Express

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Abstract:In this paper, a pulse width modulation (PWM) generator based on a switched capacitor for LCD backlight brightness control is described. The proposed scheme uses a simple RC network along with a clocked-comparator which samples the output of the ambient light sensor, and generates a PWM signal corresponding to the light level. Furthermore, by using a switched-capacitor resistor with variable clock frequency, the RC time constant is programmable and less sensitive to process variations with respect to passive resistors. In addition, it is shown that the linearity of the proposed PWM generator can be enhanced by replacing the RC network resistor with a constant current source. The operation of the PWM generator is verified through circuit level simulations, and the prototype circuit is fabricated using CMOS 0.18 um technology.

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“…The low-temperature polycrystalline-silicon (poly-Si) thin-film transistor (LTPS-TFT) process has been widely used in active liquid crystal displays (AMLCDs) and other photodevices [19], such as ambient light sensors [20,21], image scanners [22][23][24][25] and artificial retina [26,27]. This is because the LTPS-TFT device can be fabricated repetitively on a large-region substrate at lower costs than that on silicon-wafers.…”

Section: Introductionmentioning

confidence: 99%

Electron Beam Recorder for Patterned Media Mastering

Kitahara

Uno

Suzuki

et al. 2010

Jpn. J. Appl. Phys.

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This study proposes an array for a bio-handling system consisting of microcoils on top of photodetectors fabricated by low-temperature polycrystalline-silicon thin-film transistor (LTPS-TFT) technology on a glass substrate. Using magnetic beads as the medium, the proposed system can simultaneously monitor and manipulate micrometer-sized bio-samples. In a manipulation system based on magnetic force, photo-detecting is a reliable method, immune to the interference caused by electromagnetic fields. Under 480 lux ambient white light, the sensor can detect a microbead as small as 23 μm in diameter with detectable output difference. It provides a new, easier way for handling samples on a small chip.

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P-174L: Late-News Poster: The System-LCD with Monolithic Ambient-Light Sensor System

Cited by 24 publications

References 5 publications

An ambient-light sensor system with startup correction for LTPS-TFT LCD

An ambient-light sensor system with startup correction for LTPS-TFT LCD

A switched-capacitor PWM generator for LCD backlight brightness control

Electron Beam Recorder for Patterned Media Mastering

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