Sang-Bong Park

Design and Implementation of Low Power Touch Screen Controller for Mobile Devices

In is paper, we design and implement the low power, high speed touch screen controller that calculates and outputs the coordinate of touch point on the touch screen of mobile devices. The system clock is 10HMz, the number of input channels is 21, standby current is , dynamic range of input is 140pF~400pF and the response time is 0.1ms/frame. It contains the power management unit for low power, automatic impedance calibration unit in order to adapt to humidity, temperature and evaluation board, adjacent key and pattern interference suppression unit, serial interface unit of I2C and SPI. The function and performance is verified by using FPGA and CMOS standard process. The implemented touch screen is designed for using in the double layer ITO(Indium Thin Oxide) module with diamond pattern and single layer ITO module for cost-effective which are applied to mobile phone or smart remote controller.

Circuit Design and Implementation for Noise Enhancement of Optical Mouse

In this paper, we describe the contents of noise characteristic enhancement using digital filtering to the motion vector in the pattern noise of optical mouse. The designed circuit is implemented to enhance the smoothing and trembling with filtering and averaging of x, y motion vector before PS2 or USB output. The function is verified by using FPGA and the performance is measured by the fabricated chip using 0.35μm standard CMOS process. The system clock is 6MHz and the motion vector has the range of +6 to -6 per 1/1700sec. It is tested using the Cartesian robot to measure the noise characteristic enhancement.

Implementation and design of fuse controller using single wire serial communication

In this paper, we propose a fuse controller which is used for storing the optimal value or the correction value for the surrounding product of the IoT applications and it is implemented serial communication circuit using a single pin. Because of the proposed single pin protocol is simpler in the hardware than the conventional and SPI using two or more pins, it is suitable for the area of small amount of data transmission. The function of the one pin protocol is verified by logic simulation and the FPGA test board and it is fabricated using CMOS 0.35um technology. It is expected to use the IoT product that require the low power consumption and simple hardware.

Implementation and Design of Control Circuit for Touch Screen with Faster Response Time

In this paper, we describe algorithm and digital circuit implementation of touch screen controller that has the faster response time. We enhance the response time by adaptive search method instead of linear search method of step level in the pulse width decision. The faster response time might bring effects of feeling better in the touch keyboard. The performance of the proposed algorithm and function is verified by using logic simulation and FPGA test board. It is expected to use in the mobile touch screen.

The Design of Efficient User Environment on the FTIR Multi Touch

Abstract In this paper, we develop the new gestures of screen control with fingers on the FTIR multi touch table. It also describes recognition of mobile devices on the table using infrared camera. The FTIR multi touch table was incovenient to the existiog Bluetooth connection, because it is not provided with an HID(Human Input Device) interface. The proposed data transmission method using mobile device is to relieve the inconvenience of the data transfer and proceed more effectively. The new gestures and data transmission method is verified by FTIR multi touch table that is implemented for testing. Key Words : FTIR, Multi Touch Table, Bluetooth, Gesture, Mobile devices * 정회원, 세명대학교 정보통신학부 ** 준회원, ㈜다우엑실리콘접수일자 2012년 3월 2일, 수정완료 2012년 4월 3일게재확정일자 2012년 4월 13일Received: 2 March 2012 / Revised: 3 April 2012 /Accepted: 13 April 2012 ** Corresponding Author: psbcom@semyung.ac.krDept. Information&Coummunication, Semyung University, Korea Ⅰ. 서 론 최근 사회에서 우리는 주변의 많은 터치스크린을 사용하는 매체들에 둘러 싸여있다. 현재 많이 사용하고 있는 스마트폰부터 의료 과학 장비, MP3, 모니터, 텔레비전, 디지털카메라 등은 우리 일상생활에서 많은 양을 차지하고 있다. 터치스크린은 지금도 많은 개발과정을 거치고 있는데 대표적으로 터치스크린을 이용한 테이블이 있다. 멀티터치 테이블은 가정용, 회의용, 전시용 등 여러 가지 방면에서 개발되어지고 있으며 계속적으로 새로운 방식의 제품이 개발되는 중이다. 이 중에서 테이블 방식 제작에 가장 적합하다고 손꼽히고 있는 방식이 FTIR (Frustrated Touch Internal Reflection) 방식의 터치스크린이다. FTIR 방식은 스크린의 상, 하 및 좌, 우 4방면에서 IR LED를 비추게 되고 이 적외선은 상단과 하단의 반사체를 통해 스크린 안에 머물게 된다. 본 논문은 FTIR 멀티터치 테이블에서 손동작 분석과 설계 구조를 고려하여, 멀티 터치 플랫폼에 응용할 수 있