公开(公告)号：US20200348819A1

公开(公告)日：2020-11-05

申请号：US16930923

申请日：2020-07-16

Applicant: ROHM CO., LTD.

Inventor： Hirotoshi USUI ,  Naoki TADA

IPC: G06F3/041 ,  G06F3/045

Abstract: A control circuit controls a two-wire resistive touch panel. The two-wire resistive touch panel includes a first region and a second region which are adjacent to each other in a coordinate axis direction (X direction), and the first region has resistance per unit length lower than resistance per unit length of the second region. A measurement unit measures an electric signal having a correlation with impedance between two wires which are lead out from the resistive touch panel. A processing unit (i) determines that the first region is touched when the electric signal or the impedance obtained from the electric signal is included in a predetermined first range, (ii) determines that the second region is touched when the electric signal or the impedance obtained from the electric signal is included in a predetermined second range, and generates a touched coordinate.

公开(公告)号：US20170293397A1

公开(公告)日：2017-10-12

申请号：US15480679

申请日：2017-04-06

Applicant: ROHM CO., LTD.

Inventor： Hirotoshi USUI ,  Naoki TADA ,  Hiroshi YAMASHITA

IPC: G06F3/041

CPC classification number: G06F3/0418 ,  G02F1/13338 ,  G06F3/045 ,  G06F2203/04104

Abstract: A control circuit of a touch panel is disclosed. The touch panel includes first and second terminals drawn from a first resistive film; and third and fourth terminals drawn from a second resistive film. The control circuit includes a coordinate detection circuit configured to generate an impedance detection signal for an impedance of the touch panel and a voltage detection signal for at least one of voltages of the first to fourth terminals, which are used for generating a coordinate touched by a user. The control circuit further includes a memory configured to store initial data corresponding to an initial state impedance of at least one predetermined path of the touch panel. A calibration circuit of the control circuit acquires an operation state impedance of the path and calibrate the coordinate detection circuit based on detection data corresponding to the operation state impedance and the initial state impedance.

公开(公告)号：US20140375611A1

公开(公告)日：2014-12-25

申请号：US14479586

申请日：2014-09-08

Applicant: ROHM CO., LTD.

Inventor： Naoki TADA ,  Shinichi ABE ,  Koichi SAITO ,  Kazunori HISA

IPC: G06F3/045 ,  G06F3/041

CPC classification number: G06F3/045 ,  G06F3/0416 ,  G06F2203/04104

Abstract: A first resistive film is arranged such that one edge thereof is connected to a first terminal, and an edge that is opposite to the aforementioned edge is connected to a second terminal. A second resistive film is arranged with a gap between it and the first resistive film such that one edge thereof is connected to a third terminal. A voltage generating unit applies a predetermined first bias voltage and a predetermined second bias voltage to the first terminal and the second terminal, respectively. A voltage detection unit detects a panel voltage that occurs at the third terminal. A current detection unit detects a panel current that flows through a path including the first terminal, the first resistive film, and the second terminal. A computation unit determines the coordinates touched by the user, based upon the values of the panel voltage and the panel current.

Abstract translation: 第一电阻膜被布置成使得其一个边缘连接到第一端子，并且与上述边缘相对的边缘连接到第二端子。 第二电阻膜在其与第一电阻膜之间布置有间隙，使得其一个边缘连接到第三端子。 电压产生单元分别向第一端子和第二端子施加预定的第一偏置电压和预定的第二偏置电压。 电压检测单元检测在第三端子处发生的面板电压。 电流检测单元检测流过包括第一端子，第一电阻膜和第二端子的路径的面板电流。 计算单元基于面板电压和面板电流的值来确定用户触摸的坐标。

公开(公告)号：US20240176752A1

公开(公告)日：2024-05-30

申请号：US18510919

申请日：2023-11-16

Applicant: ROHM CO., LTD.

Inventor： Naoki TADA ,  Masanori ONODERA

IPC: G06F13/16 ,  G06F12/06

CPC classification number: G06F13/1689 ,  G06F12/0653 ,  G06F13/1631

Abstract: The present disclosure provides a signal processor (signal processing device). The signal processor includes: a first terminal, into which one of a clock signal and a data signal is input; a second terminal, into which another one of the clock signal and the data signal is input; a storage unit, in which an address map is set to define an address permitting data writing and an address prohibiting data writing; a designation unit, configured to designate the address map set in the storage unit; and a processing unit, configured to write a data based on the data signal to the storage unit according to the address map designated by the designation unit. The designation unit may designate a first address map and a second address map different from the first address map.