45.6: <i>Invited Paper</i>: Photo Sensing Circuits Using Low‐Temperature Polycrystalline Silicon TFTs and Photo Diode for Smart Functional Displays

Kwon, Oh‐Kyong; Lim, Han-Sin

doi:10.1889/1.3500560

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…Image sensors are other promising applications of the visible-light sensors. LTPS devices, [25][26][27][28][29][30] amorphous-Si (a-Si) devices, [31][32][33][34][35][36] and metal-oxide semiconductor devices 37 are utilized for the image sensors. The image sensors are used for image captures, fingerprint sensors, in-cell touch panels, pen inputs, three-dimensional (3D) sensing systems, etc.…”

Section: Image Sensormentioning

confidence: 99%

Sensor applications of thin‐film devices originating in display technologies

Kimura

2019

J Soc Info Display

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Thin‐film devices are widely utilized for flat‐panel displays, and the essential advantages of the thin‐film devices are generally large‐area production, various‐material substrate, layered structure, etc. Appropriate applications are flat‐panel displays, and other applications where the abovementioned advantages are available and the disadvantages are acceptable are sensor applications. Moreover, if the sensor devices can be made by thin‐film devices that have been already utilized for flat‐panel displays, they can be made without additional cost. Therefore, thin‐film devices are again promising for sensor applications especially for interactive displays. We are investigating sensor applications of thin‐film devices. Particular in this journal paper, we review sensor applications of thin‐film devices originating in display technologies. The various sensors are visible‐light sensor, infrared‐light sensor, temperature sensor, magnetic‐field sensor, etc. Many research results from many research organizations as well as our research laboratory are introduced.

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Section: Image Sensormentioning

confidence: 99%

Sensor applications of thin‐film devices originating in display technologies

Kimura

2019

J Soc Info Display

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“…First, in the shadow mode, it is difficult to distinguish between the shadow of a touching object and the shadow of a proximate one in bright ambient light. Second, the touch sensing is impossible if the on-screen image is black in backlight reflection mode [10]- [12].…”

Section: Introductionmentioning

confidence: 99%

Optical Properties of a-SiGe:H Thin Film Transistor for Infrared Image Sensors in Touch Sensing Display

Han

Park

Jeon

et al. 2012

J. Display Technol.

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We report the effects of monochromatic illumination on the electrical performance of a-SiGe:H thin-film transistor (TFT) and the use of this device as infrared (IR) image-sensing touch displays. In order to reduce the inevitable incidence of visible light into device, the visible cutting layer was designed, which played a critical role in reducing the optical noise from visible light. When the photo response was observed in real liquid crystal display (LCD) operation environment, it showed the display contents dependence, meaning that the supply of external IR light source for the touch sensing would be effective independent of any ambient light condition. Additionally, the optical noise from the display operation was eliminated using the block operation as well as the backlight IR light-emitting diode (LED) light modulation. From these, the clear touch images were successfully obtained in the a-SiGe:H photosensor embedded LCD panel.Index Terms-Amorphous SiGe, infrared (IR) detector, photosensor, thin-film transistor (TFT).

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Reduction of Common Mode Noise and Global Multivalued Offset in Touch Screen Systems by Correlated Double Sampling

Gao

Lai

Micou

et al. 2016

J. Display Technol.

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Touch based interactivity has become an important function in displays. This paper reports on the signal processing of touch signals in which touch interactivity is processed as an image and correlated double sampling (CDS) algorithm is applied for both common-mode noise reduction and global multi-valued offset cancellation. Based on experimental results, we achieved a boost in SNR of 7.6dB. The processed signal reduces detection errors and power consumption of the system.

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45.6: Invited Paper: Photo Sensing Circuits Using Low‐Temperature Polycrystalline Silicon TFTs and Photo Diode for Smart Functional Displays

Cited by 4 publications

References 5 publications

Sensor applications of thin‐film devices originating in display technologies

Sensor applications of thin‐film devices originating in display technologies

Optical Properties of a-SiGe:H Thin Film Transistor for Infrared Image Sensors in Touch Sensing Display

Reduction of Common Mode Noise and Global Multivalued Offset in Touch Screen Systems by Correlated Double Sampling

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