CN105306070A - Scanning driving method for computer keyboard - Google Patents
Scanning driving method for computer keyboard Download PDFInfo
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- CN105306070A CN105306070A CN201510705340.9A CN201510705340A CN105306070A CN 105306070 A CN105306070 A CN 105306070A CN 201510705340 A CN201510705340 A CN 201510705340A CN 105306070 A CN105306070 A CN 105306070A
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- column scan
- computer keyboard
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- scan line
- row detection
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Abstract
The invention provides a scanning driving method for a computer keyboard. The scanning driving method for computer keyboard is applied to the following computer keyboard, the computer keyboard comprises a plurality of column scanning lines, a plurality of row scanning lines and a plurality of key switch units correspondingly connected with the column scanning lines and the row scanning lines, each thin film switch unit comprises a thin film switch serially connected between the corresponding column scanning lines and the row scanning lines and a divider resistor, and the scanning driving method for computer keyboard comprises the steps that: a processor sequentially outputs column scanning signals to the plurality of column scanning lines of the computer keyboard through a column scanning port thereof to scan column by column; in a scanning process of the column scanning lines, the processor detects a voltage value of the row scanning lines through a row detection port thereof and compares the voltage value with a preset reference voltage value; and whether a key between the column scanning lines and the row scanning lines is pressed down is judged according to a comparative result.
Description
Technical field
The application relates to computer input technology, especially, relates to a kind of scanning drive method of computer keyboard.
Background technology
Computer keyboard is the computer entry device applied widely, and the button of conventional computer keyboard is matrix arrangement.Generally speaking, computer keyboard is carry out scanning by software and hardware to the switch matrix of keyboard to determine key position when button is pressed, after carrying out code conversion by processor again, be input to main frame by USB, PS2 or wave point etc., thus complete effective input.
Along with computing power constantly promotes, computer keyboard needs the requirement of the effectively multiple button of input simultaneously also to get more and more.Such as, when carrying out computer game, keyboard needs to press multiple button to realize multiple effective order simultaneously.But, because existing gamepad is realized by above-described key switch matrix, therefore when multiple button is pressed time, may produce the push button signalling in fact do not inputted be mistaken as be input situation, that is to say generation phantom key.The generation of above-mentioned phantom key will cause computer to occur misoperation, thus affect the normal use of computer.
Summary of the invention
For solving the problem, the application provides a kind of scanning drive method of computer keyboard.
The scanning drive method of described computer keyboard is applied to computer keyboard as described below, described computer keyboard comprises multiple column scan line, multiple key switch unit of multiple row detection line and connection corresponding to row detection line described horizontal scanning line, each membrane switch unit comprises and is connected on thin film switch between the row detection line of its correspondence and column scan line and divider resistance, the scanning drive method of described computer keyboard comprises: processor sequentially exports column scan signal by its column scan port respectively to multiple column scan lines of described computer keyboard and scans by column, in the scanning process of described column scan line, described processor detects the magnitude of voltage of described horizontal scanning line by its row detection port, and the magnitude of voltage of described horizontal scanning line and preset reference magnitude of voltage is compared, judge whether the button between described column scan line and described row detection line is pressed according to comparative result.
The scanning drive method of the computer keyboard adopting the application to provide, by arranging a divider resistance respectively at each key switch unit of computer keyboard, and connect one and described biasing resistor respectively in the row detection port of processor, choose suitable reference voltage value simultaneously, just can judge that current which button concrete is pressed according to the comparative result of the voltage detecting value of row detection line and reference voltage value, and exclude the phantom key that may exist, thus ensure that button accurately inputs, effectively eliminate the problem of the key mapping erroneous input that existing computer keyboard may occur, improve the performance of computer keyboard.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present application, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings, wherein:
Fig. 1 is the electrical block diagram of the first embodiment of computer keyboard that the application provides;
Fig. 2 is the optional press-key structure schematic diagram of one of the computer keyboard shown in Fig. 1;
Fig. 3 is the optional press-key structure schematic diagram of another kind of the computer keyboard shown in Fig. 1;
Fig. 4 is the drive circuit schematic diagram of the computer keyboard shown in Fig. 1;
Fig. 5 is the schematic flow sheet of the scanning drive method of the computer keyboard that the application provides;
Fig. 6 is the scanning sequence figure of the scanning drive method of the computer keyboard shown in Fig. 5;
Fig. 7 is the electrical block diagram of computer keyboard the second embodiment that the application provides;
Fig. 8 is the electrical block diagram of the third embodiment of computer keyboard that the application provides.
Embodiment
Be clearly and completely described to the technical scheme in the embodiment of the present application below, obviously, described embodiment is only a part of embodiment of the application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making other embodiments all obtained under creative work prerequisite, all belong to the scope of the application's protection.
Refer to Fig. 1, the electrical block diagram of a kind of embodiment of its computer keyboard provided for the application.The present embodiment is for the computer keyboard 100 of 112 buttons, and described 112 buttons are designated as K1 ~ K112 respectively, and it can be arranged in the matrix of 14 row * 8 row, as shown in Figure 1.Described computer keyboard 100 comprise multiple be parallel to each other column scan line C1 ~ C14, to be multiplely parallel to each other and the row detection line R1 ~ R8 substantially vertical with described column scan line C1 ~ C14 and separate the key switch unit 10 defined by described column scan line C1 ~ C14 and row detection line R1 ~ R8, each key switch unit 10 corresponds respectively to one of them button K1 ~ K112 of described computer keyboard 100.
Described key switch unit 10 comprises thin film switch 11 and divider resistance 12 respectively, see also Fig. 2, described computer keyboard 110 also comprises circuit substrate 130 and supporting bracket 120, described thin film switch 11 can comprise elastic component 111, first contact 112 and the second contact 113, described first contact 112 and described second contact 113 are formed in described computer keyboard 100 circuit substrate 130 surface, the two spaced setting; Described circuit substrate 130 can for having the thin layer of metallic conduction circuit, and it is arranged on above described supporting bracket 120, and described column scan line C1 ~ C14 and row detection line R1 ~ R8 can be formed in described circuit substrate 130 surface simultaneously.Described elastic component 111 is arranged on above described supporting bracket 120, and it comprises elastic support 115.The bottom of described elastic support 115 is fixed to described supporting bracket 120 surface by the through hole (not shown) of described circuit substrate 130, and is positioned at the top of described first contact 112 and described second contact 113.
Described elastic support 115 inside can have hollow structure, and in order to realize the pressing operation of described button K1 ~ K112, the top of described elastic support 115 can be designed to have the installation portion extending projection, for installing the keycap of described button K1 ~ K112.And, the hollow structure of described elastic support 115 inside also comprises the jut 116 extended towards described first contact 112 and described second contact 113, the surface coverage of described jut 116 has conductive layer 114, and described conductive layer 114 is positioned at the top of described first contact 112 and described second contact 113, and have certain gap with described first contact 112 and described second contact 113, and described conductive layer 114 partly covers described first contact 112 and described second contact 113 in the projection of described circuit substrate 130 simultaneously.
When the button K1 ~ K112 corresponding to described key switch unit 10 is pressed, described elastic support 115 there is elastic deformation and make the conductive layer 114 on its jut 116 surface simultaneously with described first contact 112 and described second contact 113 in electrical contact, thus make to be electrically connected between described first contact 112 and described second contact 113, now described key switch unit 10 is just in conducting state.When described button K1 ~ K112 is released, described elastic support 115 returns to reset condition, thus make the conductive layer 114 on described jut 116 surface leave described first contact 112 and described second contact 113, therefore now described first contact 112 and described second contact 113 mutually electrically isolated and make described key switch unit 10 just be in off-state.
Described divider resistance 12 is formed in the surface of described circuit substrate 130 equally, and particularly, described divider resistance 12 can adopt printed resistor or adopt discrete resistors element to realize.In the embodiment shown in Figure 2, described divider resistance 12 can also be arranged on the periphery of described elastic support 115; Alternately, in another kind of embodiment, as shown in Figure 3, the hollow structure that described divider resistance 12 can be arranged on described elastic support 115 is inner, and is adjacent to described second contact 113.
See also Fig. 1 and Fig. 4, in the present embodiment, the first contact 112 of described thin film switch 11 is connected to corresponding row detection line R1 ~ R8, and described second contact 113 is connected to corresponding column scan line C1 ~ C14 by described divider resistance 12.And, described computer keyboard 100 also comprises keyboard drive circuit 20 as shown in Figure 4, described keyboard drive circuit 20 comprises processor (CPU) 21, and described processor 21 comprises multiple column scan port corresponding with described column scan line C1 ~ C14 respectively and multiple row detection port corresponding with described row detection line R1 ~ R8 respectively.Column scan line C1 ~ C14 that the column scan port of described processor 21 is corresponding with it respectively with row detection port is connected with row detection line R1 ~ R8, and each row detection port is connected to a biasing resistor 22.
The column scan port of described processor 21 may be used for sequentially exporting column scan signal, described column scan signal can be periodic square-wave signal (i.e. low and high level signal), and the row detection port of described processor 21 can as input port, be used for detecting the change in voltage of each row detection line R1 ~ R8 when button is pressed; On the other hand, the change in voltage that described processor 21 can detect according to the scanning sequence of described column scan port and described row detection port judges the coordinate of the current button be pressed.In specific implementation, described biasing resistor 22 can be identical with the impedance of described divider resistance 12, also can be different; The present embodiment is 5.1K ohm for the resistance value of described biasing resistor 22 and is described.
Below in conjunction with the scanning drive method of the computer keyboard shown in Fig. 5, specifically introduce the operation principle of described computer keyboard 100.
When user apply external pressure press certain button Kn time, there is elastic deformation in the elastic support 115 that described external pressure oppresses the elastic component 111 of the key switch unit 10 corresponding to described button Kn, thus make the jut 116 of described elastic component 111 simultaneously with described first contact 112 and described second contact 113 in electrical contact, thus cause the conducting of described key switch unit 10.
Refer to Fig. 5, the Scan orientation method of the computer keyboard that the application provides comprises:
Step S1, sequentially exports column scan signal to column scan line and scans by column;
Particularly, the column scan port of described processor 20 exports column scan signal in order, and is scanned described column scan line C1 ~ C14 by column by described column scan signal.Refer to Fig. 6, in one embodiment, the column scan signal that described column scan port exports can be square-wave signal (i.e. low and high level signal).As shown in Figure 6, (T=t in a scan period T
1+ t
1+ ... + t
14), described processor 20 is only at t
1period exports high level signal by column scan port to column scan line C1, and at t
2~ t
14period is to column scan line C1 output low level signal; Only at t
2period exports high level signal by column scan port to column scan line C2, and at t
1and t
3~ t
14period, by that analogy, described processor 20 was only at t to column scan line C2 output low level signal
14period exports high level signal to column scan line C14, and at t
1~ t
13period is to column scan line C14 output low level signal.In other words, and in a scan period, the high level that column scan line C1 ~ C14 exported to by described processor 20 does not overlap each other, namely represent when described processor 20 exports high level by its column scan port to a certain column scan line corresponding column scan line is scanned, therefore, the duty ratio of described column scan signal is 1/14.
In a particular embodiment, the amplitude of described column scan signal and duration (i.e. high level effective time) can be configured in described processor 20 inside by program according to actual needs in advance, the present embodiment for the amplitude of described column scan signal for 5V.
Step S2, in the scanning process of described column scan line, the magnitude of voltage of detect lines scan line, and the magnitude of voltage of described horizontal scanning line and preset reference magnitude of voltage are compared;
Specifically, described processor 20 can by detecting the magnitude of voltage of described multiple horizontal scanning line R1 ~ R8 when button is pressed further by its row detection port.Further, described processor 20 magnitude of voltage that can further its row detection port be detected at described horizontal scanning line R1 ~ R8 and preset reference magnitude of voltage V
rcompare, judge whether the magnitude of voltage of described horizontal scanning line R1 ~ R8 is greater than described preset reference magnitude of voltage V
r.
Described reference voltage value V
rcan for the comparison value voltage pre-set, it is inner that it can be set in advance in described processor 20 by program.Particularly, described reference voltage value V
rcan be fixed voltage, it can be adjusted by program automatically according to the columns of the current button be pressed.
Step S3, according to comparative result, judges whether the button between described horizontal scanning line and described column scan line is pressed.
In the scanning process of a certain column scan line, if by comparing, described processor 20 finds that the magnitude of voltage of a certain horizontal scanning line is greater than described reference voltage value V
r, then described processor 20 can judge that the button between described horizontal scanning line and described column scan line is pressed; On the contrary, if the magnitude of voltage of described horizontal scanning line is less than described reference voltage value V
r, then described processor 20 can judge that the button between described horizontal scanning line and described column scan line is not pressed.
For better understanding the scanning drive method of the computer keyboard that the present embodiment provides, the principle of the scanning drive method of described computer keyboard is specifically introduced by example below in conjunction with Fig. 1, in the present embodiment, described divider resistance 12 and described biasing resistor 22 are all for the resistance of 5.1K Ω, therefore in the following description, the resistance value of described divider resistance 12 adopts R
dividing potential droprepresent, the resistance value of described biasing resistor 22 adopts R
biasedrepresent, wherein, R
dividing potential drop=R
biased=5.1K Ω, and the magnitude of voltage of the column scan voltage that described column scan port C1 ~ C14 exports adopts V
orepresent.
(I) suppose currently only have an independent button to be pressed, such as, button K1 between current column scan line C1 and row detection line R1 is pressed, key switch unit 10 conducting be then connected with described row detection line R1 with described column scan line C1 in Fig. 1, therefore, in the scan period of described column scan line C1, the column scan signal of described column scan line C1 outputs to described row detection line R1 by by the thin film switch 11 of described key switch unit 10 and divider resistance 12, due in described processor 20, the row detection port be connected with described row detection line R1 is connected with biasing resistor 22 simultaneously, therefore described processor 20 be connected to described in state row detection line R1 the magnitude of voltage V1 that detects of row detection port be the magnitude of voltage of column scan signal between described divider resistance 12 and described biasing resistor 22 after dividing potential drop of described column scan line C1, namely
V1=R
biased/ (R
dividing potential drop+ R
biased) * V
o=0.5V
o> V
r
Described reference voltage value V
rcan be preconfigured to: 0.25V
o< V
r< 0.5V
o, then described processor 20 now can go out the magnitude of voltage V1=0.5V of described row detection line R1 by multilevel iudge
obe greater than described reference voltage value V
r, therefore judge that the button K1 between described column scan line C1 and described row detection line R1 is pressed.
(II) suppose current column scan line C1, C2 and row detection line R1, R2 and between button K1, K2 and K15 be concurrently depressed, the key switch unit be connected with row detection line R1 with described column scan line C1 in Fig. 1, the key switch unit be connected with row detection line R2 with described column scan line C1 and the equal conducting of key switch unit be connected with row detection line R1 with described column scan line C2.For ease of understanding, respectively the divider resistance in the key switch unit 10 corresponding to button K1, K2 and K15 being designated as r1, r2 and r15 below, and thin film switch 11 in the key switch unit 10 corresponding to button K1, K2 and K15 is designated as s1, s2 and s15.
In the scan period of column scan line C1, the column scan signal of described column scan line C1 will output to row detection line R1 by thin film switch s1 and corresponding divider resistance r1 thereof, and output to row detection line R2 by thin film switch s1 and corresponding divider resistance r15 thereof, therefore as the analysis of situation (I), the line scanning port being connected to row detection line R1 and R2 of described processor 20 to be detecting respectively at the magnitude of voltage V1 of described row detection line R1 and the magnitude of voltage V2 of described horizontal scanning line R2:
V1=R
biased/ (r1+R
biased) * V
o=0.5V
o> V
r
V2=R
biased/ (r15+R
biased) * V
o=0.5V
o> V
r
Similar with situation (I), described processor 20 can judge that current V1 and V2 is all greater than described reference voltage value V further
r, therefore just first can judge that the button K1 between current described column scan line C1 and described row detection line R1 and the button K15 between described column scan line C1 and described row detection line R2 is all pressed.
In the scan period of column scan line C2, the column scan signal of described column scan line C2 will export to described horizontal scanning line R1, the magnitude of voltage V1 ' that the line scanning port that therefore described processor 20 is connected to described horizontal scanning line R1 will detect at described horizontal scanning line R1 by thin film switch s2 and corresponding divider resistance r2 thereof:
V1 '=R
biased/ (r2+R
biased) * V
o=0.5V
o> V
r
Analogously, described processor 20 can judge that the button K2 between described column scan line C2 and described horizontal scanning line R1 is pressed thus.
On the other hand, in the scan period of described column scan line C2, the column scan signal of described column scan line C2 also sequentially will output to described row detection line R2 by divider resistance r2 and thin film switch s2, row detection line R1, thin film switch s1 and corresponding divider resistance r1, column scan line C1, divider resistance r15 and thin film switch s15, therefore, the row detection port that described processor 20 is connected with described horizontal scanning line R2 also will detect the magnitude of voltage V2 ' of described horizontal scanning line R2:
V2 '=R
biased/ ((r2+r1+r15)+R
biased)) * V
o=0.25V
o< V
r
Due to reference voltage value V
rbe preconfigured to: 0.25V
o< V
r< 0.5V
o, therefore described processor 20 can judge that current V2 ' is less than described reference voltage value V further
r, thus can judge that the button K16 between current described column scan line C2 and row detection line R2 is not pressed, namely now described button K16 is " phantom key ".
To sum up, in situation (II), described processor 20 can judge that the current button be pressed is K1, K2 and K15 totally three buttons exactly, and gets rid of described phantom key K16, thus the situation of the button erroneous input avoiding prior art to exist.
(III) current line scan line R1, R2 is supposed and between column scan line C1, C2, button K1, K2, K15 and K16 are concurrently depressed, the key switch unit be connected with row detection line R1 with described column scan line C1 in Fig. 1, the key switch unit be connected with row detection line R2 with described column scan line C1, the key switch unit be connected with row detection line R1 with described column scan line C2 and the equal conducting of key switch unit be connected with row detection line R2 with described column scan line C2.For ease of understanding, below respectively the divider resistance in the key switch unit 10 corresponding to button K1, K2, K15 and K16 is designated as r1, r2, r15 and r16, and thin film switch 11 in the key switch unit 10 corresponding to button K1, K2 and K15 is designated as s1, s2, s15 and s16.
In the scan period of described column scan line C1, the column scan signal of described column scan line C1 outputs to horizontal scanning line R1 by thin film switch s1 and corresponding divider resistance r1 thereof on the one hand, on the other hand, described column scan signal is also sequentially by divider resistance r15 and thin film switch s15, row detection line R2, thin film switch s16 and corresponding divider resistance r16 thereof, column scan line C2, divider resistance r2 and thin film switch s2 outputs to described horizontal scanning line R1, therefore, the row detection port that described processor 20 is connected with described row detection line R1 is that described column scan signal is at described button K15 from the magnitude of voltage V1 that described row detection line R1 detects, the divider resistance r15 of K16 and K2, r16, series resistance (the R that r2 connects mutually
series connection=r15+r16+r2) the equivalent resistance R that obtain in parallel with the divider resistance r1 of described button K1
equivalencemagnitude of voltage after biasing resistor 22 dividing potential drop be connected with described row detection port again, that is:
R
equivalence=R
series connection* r1/ (R
series connection+ r1)=0.75R
dividing potential drop
V1=R
biased/ (R
equivalence+ R
biased) * V
o=0.57V
o> V
r
Described processor 20 can judge that the voltage V1 of current line detection line R1 is greater than described reference voltage value V further
r, therefore judge that the button K1 between current described column scan line C1 and row detection line R1 is pressed.
In like manner, in the scan period of column scan line C1, described processor 20 can detect that the voltage V2 of current line detection line R2 is greater than described reference voltage value V equally
r, therefore judge that the case K15 between described column scan line C1 and horizontal scanning line R2 is also pressed further.
Analogously, in the scan period of column scan line C2, the magnitude of voltage that described processor 20 also can detect trip detection line R1 and R2 is also all greater than described reference voltage value, therefore judges that the button K2 between current described column scan line C2 and described row detection line R1 and the button K16 between described column scan line C2 and described horizontal scanning line R2 is all pressed.
Thus, described processor 20 just can judge that the current button be pressed is K1, K2, K3 and K4 totally four buttons.
In sum, the scanning drive method of the computer keyboard adopting the application to provide, by arranging a divider resistance respectively at each key switch unit of computer keyboard, and connect one and described biasing resistor respectively in the row detection port of processor, choose suitable reference voltage value simultaneously, just can judge that current which button concrete is pressed according to the comparative result of the voltage detecting value of row detection line and reference voltage value, and exclude the phantom key that may exist, thus ensure that button accurately inputs, effectively eliminate the problem of the key mapping erroneous input that existing computer keyboard may occur, improve the performance of computer keyboard.
Refer to Fig. 6, the electrical block diagram of its computer keyboard the second embodiment provided for the application.Computer keyboard 200 shown in Fig. 6 and computer keyboard 100 structural similarity shown in Fig. 1, the main distinction is:
First contact 112 of the thin film switch 11 of the computer keyboard 200 provided at the present embodiment is directly connected to corresponding row detection line R1 ~ R8, and the second contact 113 of described key switch unit 10 is connected to the divider resistance 12 of its correspondence; Further, the divider resistance 12 being positioned at the key switch unit 10 corresponding to button of same row realizes serial connection mutually respectively by corresponding column scan line C1 ~ C14, that is, the divider resistance 12 being positioned at same row is serially connected among the column scan line C1 ~ C14 of its correspondence.Such as, in the embodiment shown in fig. 6, first row button K1, K15 ..., K85, K99 (i.e. K
14n+1, n=0,1,2 ..., 14) corresponding to divider resistance r1, r15 ..., r85, r99 (i.e. r
14n+1, n=0,1,2 ..., 14) and realize serial connection mutually by first row scan line C1.Meanwhile, each divider resistance r
14n+1wherein one end be connected respectively to the second contact 113 of the key switch unit 10 belonging to it.
It should be noted that in the computer keyboard 100 provided at the present embodiment, the resistance value being serially connected in the divider resistance of different lines scan line C1 ~ C14 is respectively different, and the resistance value being serially connected in the divider resistance of same column scan line is identical.For better understanding the technical scheme that the present embodiment provides, suppose that the resistance value of described biasing resistor 22 is R
biasedbe a reference resistance value R
reference, then the resistance value being serially connected in the divider resistance of different lines scan line C1 ~ C14 can configure respectively as follows:
(1) divider resistance of first column scan line C1 is serially connected in (namely: r
14n+1, n=0,1 ... 7) resistance value R
dividing potential drop 1can be configured to: R
dividing potential drop 1=R
reference;
(2) divider resistance of second column scan line C2 is serially connected in (namely: r
14n+2, n=0,1 ... 7) resistance value R
dividing potential drop 2can be configured to: R
dividing potential drop 1=2*R
reference;
By that analogy,
(14) divider resistance of the 14 column scan line C14 is serially connected in (namely: r
14n+14, n=0,1, 7) resistance value R
dividing potential drop 14can be configured to: R
dividing potential drop 1=14*R
reference.
In addition, in the present embodiment, the reference voltage value of each row detection port of described processor 20 is different, for ease of describing, below the reference voltage value of the row detection port be connected with described row detection line R1 ~ R8 is designated as V respectively
r1, V
r2, V
r3, V
r4, V
r5, V
r6, V
r7, V
r8, particularly, the reference voltage value of the row detection port that described row detection line R1 ~ R8 is connected is designated as V respectively
r1~ V
r8also can be configured to respectively:
(1)V
R1：0.48V
o＜V
R1＜0.5V；
(2)V
R2：0.30V
o＜V
R2＜0.33V
o；
(3)V
R3：0.23V
o＜V
R3＜0.25V；
(4)V
R4：0.18V
o＜V
R4＜0.2V；
(5)V
R5：0.15V
o＜V
R5＜0.16V；
(6)V
R6：0.13V
o＜V
R6＜0.14V；
(7)V
R7：0.12V
o＜V
R7＜0.125V；
(8)V
R8：0.10V
o＜V
R8＜0.11V
Refer to Fig. 7, the electrical block diagram of its third embodiment of computer keyboard provided for the application.Computer keyboard 300 shown in Fig. 7 can be understood as the computer keyboard 100 shown in Fig. 1 and the combination both the computer keyboard shown in Fig. 6 200, and it can improve accuracy and the reliability of phantom key identification.Particularly, described computer keyboard 300 is with the main distinction of the computer keyboard described in Fig. 1:
Thin film switch 11 and two divider resistances 12 are comprised at each key switch unit 10 of described computer keyboard 300, 13, i.e. the first divider resistance 12 and the second divider resistance 13, wherein, first contact 112 of described thin film switch 11 is connected to corresponding row detection line R1 ~ R8, and described second contact 113 is connected to corresponding column scan line C1 ~ C14 by described first divider resistance 12, described second divider resistance 13 is serially connected among its corresponding column scan line C1 ~ C14, in other words, described second divider resistance 13 is similar with the connected mode of the divider resistance 12 in the embodiment shown in Fig. 6.Specifically, the second divider resistance 13 being positioned at the key switch unit 10 corresponding to button of same row realizes serial connection mutually respectively by corresponding column scan line C1 ~ C14, that is, the second divider resistance 13 being positioned at same row is serially connected among the column scan line C1 ~ C14 of its correspondence.
The operation principle of the computer keyboard 200 and 300 shown in Fig. 6 and Fig. 7 see the associated description of above computer keyboard 100, can repeat no more herein.
The foregoing is only the embodiment of the application; not thereby the scope of the claims of the application is limited; every utilize present specification content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical field, be all in like manner included in the scope of patent protection of the application.
Claims (10)
1. the scanning drive method of a computer keyboard, it is characterized in that, be applied to computer keyboard as described below, described computer keyboard comprises multiple key switch unit of multiple column scan line, multiple row detection line and connection corresponding to row detection line described horizontal scanning line, each membrane switch unit comprises and is connected on thin film switch between the row detection line of its correspondence and column scan line and divider resistance, and the scanning drive method of described computer keyboard comprises:
Processor sequentially exports column scan signal by its column scan port respectively to multiple column scan lines of described computer keyboard and scans by column;
In the scanning process of described column scan line, described processor detects the magnitude of voltage of described horizontal scanning line by its row detection port, and the magnitude of voltage of described horizontal scanning line and preset reference magnitude of voltage is compared;
Judge whether the button between described column scan line and described row detection line is pressed according to comparative result.
2. the scanning drive method of computer keyboard according to claim 1, it is characterized in that, the column scan signal that described multiple column scan port exports to described multiple column scan line is low and high level signal, and the high level period non-overlapping of the column scan signal of described multiple column scan port output.
3. computer keyboard according to claim 1, is characterized in that, each row detection port of described processor is connected to biasing resistor, and described row detection port is by described biasing resistor ground connection.
4. computer keyboard according to claim 3, is characterized in that, the resistance value of described biasing resistor is identical with the resistance value of described divider resistance.
5. computer keyboard according to claim 4, is characterized in that, described reference voltage value meets the following conditions: 0.25V
o< V
r< 0.5V
o, wherein V
rfor described reference voltage value, and V
ofor the magnitude of voltage of the column scan signal that the column scan port of described processor exports.
6. computer keyboard according to claim 5, is characterized in that, whether the described button judging between described column scan line and described row detection line according to comparative result is pressed and comprises:
If the magnitude of voltage of described row detection line is greater than described reference voltage value, then described processor judges that the button between described column scan line and described row detection line is pressed;
If the magnitude of voltage of described horizontal scanning line is less than described reference voltage value, then described central processing unit judges that the button between described column scan line and described row detection line is not pressed.
7. the scanning drive method of computer keyboard according to claim 1, it is characterized in that, described thin film switch comprises elastic component, the first contact and the second contact, described first contact and described second contact are formed in circuit substrate surface, the two spaced setting, described elastic component is positioned at above described first contact and described second contact.
8. the scanning drive method of computer keyboard according to claim 7, it is characterized in that, first contact of described thin film switch is connected to the horizontal scanning line of its correspondence, and described divider resistance is connected between the second contact of described thin film switch and the column scan line of correspondence.
9. the scanning drive method of computer keyboard according to claim 7, it is characterized in that, first contact of described thin film switch is connected to the column scan line of its correspondence, and the second contact of described thin film switch is connected to described divider resistance, and the divider resistance being positioned at the key switch unit corresponding to button of same row realizes serial connection mutually respectively by corresponding column scan line.
10. the scanning drive method of computer keyboard according to claim 7, it is characterized in that, described divider resistance comprises the first divider resistance and the second divider resistance, first contact of wherein said thin film switch is connected to the column scan line of its correspondence, and described first divider resistance is connected between the second contact of described thin film switch and the column scan line of correspondence, and the second divider resistance being positioned at the key switch unit corresponding to button of same row realizes serial connection mutually respectively by corresponding column scan line.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510705340.9A CN105306070A (en) | 2015-10-26 | 2015-10-26 | Scanning driving method for computer keyboard |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510705340.9A CN105306070A (en) | 2015-10-26 | 2015-10-26 | Scanning driving method for computer keyboard |
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| CN105306070A true CN105306070A (en) | 2016-02-03 |
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| CN201510705340.9A Pending CN105306070A (en) | 2015-10-26 | 2015-10-26 | Scanning driving method for computer keyboard |
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| CN106200999A (en) * | 2016-07-07 | 2016-12-07 | 苏州达方电子有限公司 | Keyboard |
| CN106646212A (en) * | 2016-12-13 | 2017-05-10 | 珠海市杰理科技股份有限公司 | Multi-button detection device and detection method |
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| US20070247339A1 (en) * | 2006-04-04 | 2007-10-25 | Zippy Technology Corp. | Keyboard without ghost keys |
| CN101854176A (en) * | 2009-04-03 | 2010-10-06 | 旭丽电子(广州)有限公司 | Ghost key detection circuit and related method thereof |
| CN203894703U (en) * | 2014-05-12 | 2014-10-22 | 张文嵛 | Computer keyboard |
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| US20070247339A1 (en) * | 2006-04-04 | 2007-10-25 | Zippy Technology Corp. | Keyboard without ghost keys |
| CN101854176A (en) * | 2009-04-03 | 2010-10-06 | 旭丽电子(广州)有限公司 | Ghost key detection circuit and related method thereof |
| CN203894703U (en) * | 2014-05-12 | 2014-10-22 | 张文嵛 | Computer keyboard |
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| CN106200999A (en) * | 2016-07-07 | 2016-12-07 | 苏州达方电子有限公司 | Keyboard |
| CN106200999B (en) * | 2016-07-07 | 2019-02-26 | 苏州达方电子有限公司 | Keyboard |
| CN106646212A (en) * | 2016-12-13 | 2017-05-10 | 珠海市杰理科技股份有限公司 | Multi-button detection device and detection method |
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Application publication date: 20160203 |