56.3: Active Matrix LCD with Integrated Optical Touch Screen

Boer, Willem den; Abileah, Adi; Green, Pat; Larsson, Terrance; Robinson, S.; Nguyen, Tin

doi:10.1889/1.1832568

Cited by 38 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For optical touch, there are two primary methods for achieving illumination positions according to the distribution of photodetectors. For the Planar Array Type (PAT) [14][15][16], the optical sensing units are embedded into each pixel of the display panel. For the Line Array Type (LAT) [17], the detectors are set around the four edges of transparent micro structured film.…”

Section: Introductionmentioning

confidence: 99%

Differential Signal Amplitude Modulated Multi-beam Remote Optical Touch Based on Grating Antenna

Huang,

Lin,

et al. 2024

Preprint

View full text Add to dashboard Cite

As screen sizes are becoming larger and larger, which are beyond human’s physical limitation for direct touching interaction, remote controls are inevitable. However, as techniques applied so far, inertial gyroscopes are susceptible to position inaccuracies, and gesture recognition is limited by cameras’ focus depth and viewing angle. Grating antenna light trapping technology will be an ideal candidate providing the ghost point problem for multipoint inputs can be solved. Therefore, we propose a differential amplitude modulation scheme for grating antenna based multi beam optical touch, which can recognize different incidence points. Where, the amplitude of the incident beams was coded with different pulse width at first. Then, after been trapped by the grating antenna and been transferred into currents by the lined detector arrays, the incident points of the individual beams were recognized and differentiated. The scheme was successfully verified on an 18-inch screen, where two-point optical touch with position accuracy error under 3mm and response time less than 7ms under modulation frequency of 10kHz on both incident beams are obtained. This work paves a practical way for remote multi-point touch, which can make digital mouse in consistent to the users pointing direction obeying natural three-point one ling aiming rule instantaneously.

show abstract

Section: Introductionmentioning

confidence: 99%

Differential Signal Amplitude Modulated Multi-beam Remote Optical Touch Based on Grating Antenna

Huang,

Lin,

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…Existing touch screens use one of several technologies. [1][2][3][4][5][6][7] Conventionally, touch screens have only been capable of recognizing a single touch event even when the touch screen is touched at multiple points simultaneously. Recently, several electronic devices that can detect multi-touch events have been introduced.…”

Section: Introductionmentioning

confidence: 99%

Embedded Touch Sensing Circuit Using Mutual Capacitance for Active-Matrix Organic Light-Emitting Diode Display

Park

Seok

Park

et al. 2011

Jpn. J. Appl. Phys.

View full text Add to dashboard Cite

We propose and simulate an embedded touch sensing circuit for active-matrix organic light-emitting diode (AMOLED) displays. The circuit consists of three thin-film transistors (TFTs), one fixed capacitor, and one variable capacitor. AMOLED displays do not have a variable capacitance characteristic, so we realized a variable capacitor to detect touches in the sensing pixel by exploiting the change in the mutual capacitance between two electrodes that is caused by touch. When a dielectric substance approaches two electrodes, the electric field is shunted so that the mutual capacitance decreases. We use the existing TFT process to form the variable capacitor, so no additional process is needed. We use advanced solid-phase-crystallization TFTs because of their stability and uniformity. The proposed circuit detects multi-touch points by a scanning process.

show abstract

“…Recently, technologies for touch sensor integration on the substrates of thin-film transistors (TFTs) in liquid crystal displays have been proposed. [1][2][3][4][5][6] They have many advantages such as reduced production cost for touch screens, light weight, and good display quality over add-on-type touch screens. Three kinds of sensors for in-cell touch panels, namely, resistive, capacitive, and optical sensors are being considered.…”

Section: Introductionmentioning

confidence: 99%

“…It detects light reflected from screens or shadows made by external illumination when the screen is touched. [1][2][3] However these properties make it difficult to use such device as a touch sensor since the sensor is apt to respond to unintended light noise. Another approach for in-cell touch panels is the use of a resistive sensor, which is composed of two electrodes made on a TFT and a color filter substrate.…”

Section: Introductionmentioning

confidence: 99%

Active Matrix Touch Sensor Perceiving Liquid Crystal Capacitance with Amorphous Silicon Thin Film Transistors

Kim¹,

Kang²,

Jung³

et al. 2010

Jpn. J. Appl. Phys.

View full text Add to dashboard Cite

The possibility of atomic detection of gravitational waves on Eillth is considered. The combination of extremely high lifetimes and resulting small radiative transition probabilities with rapidly growing interaction strength for Rydberg atoms having principal quantum numbers in the region 104-105 might result in transition probabilities which are high enough to open up such a possibiiity. Transition probabilities and absorption cross sections are calculated DS a function of the relevant quantum numbers of a highly ucited electron. The orders of magnitude for the transition rate ae evaluated for a realistic source of gravitational radiation. It is shown that no specific particle property enters the expression for the absorption cmss section for gravitational waves. The only fundamental constant contained in this cross section is, apart from the fine structure constant a. the Plan& length L' = @ C / C~) ' /~.

show abstract

56.3: Active Matrix LCD with Integrated Optical Touch Screen

Cited by 38 publications

References 0 publications

Differential Signal Amplitude Modulated Multi-beam Remote Optical Touch Based on Grating Antenna

Differential Signal Amplitude Modulated Multi-beam Remote Optical Touch Based on Grating Antenna

Embedded Touch Sensing Circuit Using Mutual Capacitance for Active-Matrix Organic Light-Emitting Diode Display

Active Matrix Touch Sensor Perceiving Liquid Crystal Capacitance with Amorphous Silicon Thin Film Transistors

Contact Info

Product

Resources

About