公开(公告)号：US20170147086A1

公开(公告)日：2017-05-25

申请号：US15361025

申请日：2016-11-24

Applicant: Darfon Electronics Corp.

Inventor： Chien-Hsin Lee ,  Wei-Chan Sung

IPC: G06F3/023

CPC classification number: G06F3/0233 ,  G06F3/023 ,  H03M11/20

Abstract: A keyboard device includes M driving circuits DC(1)˜DC(M), N transition circuits TC(1)˜TC(N), a control module, M column signal lines C(1)˜C(M), N row signal lines R(1)˜R(N) and M*N key units KU(1,1)˜KU(M,N). The control module performs a scanning process to sequentially scan the M column signal lines C(1)˜C(M) in M scan cycles scan(1)˜scan(M). If the key unit KU(k,x) connected with the k-th column signal line C(k) and the x-th row signal line R(x) is depressed, a scan voltage is transmitted from the k-th column signal line C(k) to the x-th row signal line R(x) through a switch sw(k,x) of the key unit KU(k,x). The transition circuit TC(x) connected with the x-th row signal line R(x) is turned on according to the scan voltage. Consequently, an output voltage Rout(x) from the transition circuit TC(x) has a first voltage level.

公开(公告)号：US11315746B2

公开(公告)日：2022-04-26

申请号：US17097105

申请日：2020-11-13

Applicant: Darfon Electronics Corp.

Inventor： Chien-Hsin Lee

IPC: H01H13/83 ,  H01H13/02 ,  H03K17/94 ,  H03K17/969 ,  H03K17/795 ,  H03K3/42

Abstract: A method for adjusting an optical switch keyboard and an optical switch keyboard using the adjusting method are provided. The optical switch keyboard has a number of key units. The method includes the following steps. A scan signal is applied to one of a number of scan lines by a control unit at a first scan time point. A light is emitted by a light source according to the scan signal. A light emitted by the light source is detected by a detecting element to generate a detecting electric signal. The detecting electric signal is read by the control unit to obtain a first read signal voltage. When the first read signal voltage is outside the voltage range of the pressed state of the key unit, the period of the scan signal is increased by a first predetermined amount by the control unit to obtain an adjusted scan signal.

公开(公告)号：US09921664B2

公开(公告)日：2018-03-20

申请号：US15361025

申请日：2016-11-24

Applicant: Darfon Electronics Corp.

Inventor： Chien-Hsin Lee ,  Wei-Chan Sung

IPC: G06F3/02 ,  G09G5/00 ,  G06F3/023

CPC classification number: G06F3/0233 ,  G06F3/023 ,  H03M11/20

Abstract: A keyboard device includes M driving circuits DC(1)˜DC(M), N transition circuits TC(1)˜TC(N), a control module, M column signal lines C(1)˜C(M), N row signal lines R(1)˜R(N) and M*N key units KU(1,1)˜KU(M,N). The control module performs a scanning process to sequentially scan the M column signal lines C(1)˜C(M) in M scan cycles scan(1)˜scan(M). If the key unit KU(k,x) connected with the k-th column signal line C(k) and the x-th row signal line R(x) is depressed, a scan voltage is transmitted from the k-th column signal line C(k) to the x-th row signal line R(x) through a switch sw(k,x) of the key unit KU(k,x). The transition circuit TC(x) connected with the x-th row signal line R(x) is turned on according to the scan voltage. Consequently, an output voltage Rout(x) from the transition circuit TC(x) has a first voltage level.

公开(公告)号：US20180120951A1

公开(公告)日：2018-05-03

申请号：US15859824

申请日：2018-01-02

Applicant: Darfon Electronics Corp.

Inventor： Chien-Hsin Lee ,  Wei-Chan Sung

IPC: G06F3/023

CPC classification number: G06F3/0233 ,  G06F3/023 ,  H03M11/20

Abstract: A keyboard device includes M driving circuits DC(1)˜DC(M), N transition circuits TC(1)˜TC(N), a control module, M column signal lines C(1)˜C(M), N row signal lines R(1)˜R(N) and M*N key units KU(1,1)˜KU(M,N). The control module performs a scanning process to sequentially scan the M column signal lines C(1)˜C(M) in M scan cycles scan(1)˜scan(M). If the key unit KU(k,x) connected with the k-th column signal line C(k) and the x-th row signal line R(x) is depressed, a scan voltage is transmitted from the k-th column signal line C(k) to the x-th row signal line R(x) through a switch sw(k,x) of the key unit KU(k,x). The transition circuit TC(x) connected with the x-th row signal line R(x) is turned on according to the scan voltage. Consequently, an output voltage Rout(x) from the transition circuit TC(x) has a first voltage level.

公开(公告)号：US10073539B2

公开(公告)日：2018-09-11

申请号：US15859824

申请日：2018-01-02

Applicant: Darfon Electronics Corp.

Inventor： Chien-Hsin Lee ,  Wei-Chan Sung

IPC: G06F3/02 ,  G09G5/00 ,  G06F3/023 ,  H03M11/20

CPC classification number: G06F3/0233 ,  G06F3/023 ,  H03M11/20

Abstract: A keyboard device includes M driving circuits DC(1)˜DC(M), N transition circuits TC(1)˜TC(N), a control module, M column signal lines C(1)˜C(M), N row signal lines R(1)˜R(N) and M*N key units KU(1,1)˜KU(M,N). The control module performs a scanning process to sequentially scan the M column signal lines C(1)˜C(M) in M scan cycles scan(1)˜scan(M). If the key unit KU(k,x) connected with the k-th column signal line C(k) and the x-th row signal line R(x) is depressed, a scan voltage is transmitted from the k-th column signal line C(k) to the x-th row signal line R(x) through a switch sw(k,x) of the key unit KU(k,x). The transition circuit TC(x) connected with the x-th row signal line R(x) is turned on according to the scan voltage. Consequently, an output voltage Rout(x) from the transition circuit TC(x) has a first voltage level.