59.3: Integrated Optical Touch Panel in a 14.1″ AMLCD

Abileah, Adi; Boer, Willem den; Larsson, Terrance; Baker, Tom; Robinson, S.; Siegel, Roy; Fickenscher, Noah; Leback, Brent; Griffin, Terry; Green, Pat

doi:10.1889/1.1821371

Cited by 38 publications

(24 citation statements)

References 2 publications

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“…Following in touch mode, we calculate the difference between and , then retrieve probability ( ) of each -sensor at step in Gaussian model, equation (1). Following, the probability values are multiplied among -sensors to render final probability values ( ) of the input at each step of depth, equation (2); then they are normalized to be the features ( ) for training, equation (3). Finally, a trained model with maximum likelihood [9] weighting ( ) is then executed to render depth value ( ), equation (4).…”

Section: System Architecturementioning

confidence: 99%

See 1 more Smart Citation

P.133: 3D Multi‐Touch System by Using Coded Optical Barrier on Embedded Photo‐Sensors

Fang

Wang

Chang

et al. 2013

Symp Digest of Tech Papers

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Limited by construction complexity, bare finger touch systems are not ready to be used on mobile devices. Hence, we proposed a system using coded optical barrier with less hardware and software complexity; based on the construction, touch algorithm is programed to obtained 3D location (x,y,z) of input(s). Finally, our concept was implemented on a 4-inch panel. The system was able to sense up to 3 touch inputs simultaneously within 35 mm working range. Author Keywords3D touch; multi-touch; near-distance touch; in-cell photo sensor; depth sensing; bare finger. Background3D touch is a platform that user performs natural gestures to manipulate virtual 3D images. In general, 3D touch systems can be separated into two classes by their working range. The first class, which is based on machine [1] and camera constructions [2], works in far-distance environment; it is already well-applied on TV game consoles. However, their construction limitations, such as additional device and blind range issues, restrict the feasibility to be implemented on mobile devices. Therefore, the second class, 3D touch in near-distance should be established. A promising candidate is in-cell photo sensor touchscreen [3]. However, it is not ready for 3D touch yet owing to low sensitivity. To conquer the issue, extra optical designs should be constructed. They can be diversified into two types. First, light pen [4] system, where user holds patterned light pen to interact, which are considered inconvenient. Second, bare finger system, where ideally light source can be integrated with display so that user can perform nature gestures; it's hence more user-friendly. Prior Approaches and ObjectivesIn a bare finger system, ideally, user can naturally manipulate computer with bare hand. Listed below are three prior systems but still needed to be improved. The limitation and comparison is described in Figure 1. First, 3D finger touch with sequential illuminator [5] was proposed by M.C. Ma et al. It used sequential light at different tilt angles to spot the touch point. However, in the construction, slow frame rate was induced due to capturing sequence. In addition, complex lateral light source made it difficult to be realized on products. Second, a system LCD with integrated 3-dimensional input device [6] was proposed by C. Brown et al. Their key contribution is to propose a construction of directional sensor. It analyzed disparity in the sensor to obtain depth value. However, owing to the sensor design, working range was too restricted for practical use. In addition, constrained by the architecture, the aforementioned two systems were unable to support multi-touch. Third, an LCD display system with depth-sensing capability based on coded aperture imaging [7] was proposed by S. Suh et al. The system uses dynamic lens-less imaging system to enlarge working range. Nevertheless, switches between display mode and touch mode of LC would reduce frame rate and cause image flickering. Moreover, processing numbers of images accounts for huge computation.Br...

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Section: System Architecturementioning

confidence: 99%

“…Therefore, the second class, 3D touch in near-distance should be established. A promising candidate is in-cell photo sensor touchscreen [3]. However, it is not ready for 3D touch yet owing to low sensitivity.…”

mentioning

confidence: 99%

P.133: 3D Multi‐Touch System by Using Coded Optical Barrier on Embedded Photo‐Sensors

Fang

Wang

Chang

et al. 2013

Symp Digest of Tech Papers

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“…For application in real portable devices, an embedded optical sensor based approach [16][17][18] was proposed that can be integrated into the display pixels to provide light and maintain a thin form. As shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Bare Finger 3D Air-Touch System Using an Embedded Optical Sensor Array for Mobile Displays

Wang

Huang

Chang

et al. 2014

J. Display Technol.

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Generally, 3D interactive systems are used in systems with large displays and are not suitable for portable devices. To "touch" a floating 3D image displayed from a mobile device, we proposed a camera-free, 3D, interactive, virtual-touch system for bare fingers. By embedding optical sensors into the display pixels and adding angular scanning illuminators to the edge of the display, a flat panel can sense the images reflected off a bare finger. The 3-axis (x, y, z) information of the fingertip can be determined by analyzing these reflected images. The proposed 3D virtual-touch system successfully functions with a 4-inch mobile display.Index Terms-Three dimensional (3D) virtual touch, embedded optical sensors.

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“…The most popular in-cell touch-screen panel uses an optical-sensor method. [1][2][3][4][5][6] An optical sensor consisting of LTPS photodiodes detects finger shadows and light reflected from a backlight unit. This method realizes multi-touch and additional functionality as a contact image sensor and has led to new applications such as built-in scanner displays and built-in fingerprint-recognition displays.…”

Section: Introductionmentioning

confidence: 99%

Active‐matrix sensor in AMLCD detecting liquid‐crystal capacitance with LTPS‐TFT technology

et al. 2009

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Abstract— An active‐matrix capacitive sensor for use in AMLCDs as an in‐cell touch screen has been developed. Pixel sensor circuits are embedded in each pixel by using low‐temperature polycrystalline‐silicon (LTPS) TFT technology. It detects a change in the liquid‐crystal capacitance when it is touched. It is thin, light weight, highly sensitive, and detects three or more touch events simultaneously.

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59.3: Integrated Optical Touch Panel in a 14.1″ AMLCD

Cited by 38 publications

References 2 publications

P.133: 3D Multi‐Touch System by Using Coded Optical Barrier on Embedded Photo‐Sensors

P.133: 3D Multi‐Touch System by Using Coded Optical Barrier on Embedded Photo‐Sensors

Bare Finger 3D Air-Touch System Using an Embedded Optical Sensor Array for Mobile Displays

Active‐matrix sensor in AMLCD detecting liquid‐crystal capacitance with LTPS‐TFT technology

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