CN102364412B - Circuit structure of capacitive touch control pen - Google Patents
Circuit structure of capacitive touch control pen Download PDFInfo
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- CN102364412B CN102364412B CN201110329302.XA CN201110329302A CN102364412B CN 102364412 B CN102364412 B CN 102364412B CN 201110329302 A CN201110329302 A CN 201110329302A CN 102364412 B CN102364412 B CN 102364412B
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- electric capacity
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Abstract
The invention relates to a circuit structure of a capacitive touch control pen. The touch control pen comprises a pen head and a pen body, wherein a conducting wire is introduced from the pen body and is connected with a touch control screen through a circuit board. When the touch control pen operates on the touch control screen, the circuit structure mainly comprises a scanning end circuit and a reference end circuit, and a negative pulse voltage is loaded on the scanning end circuit of the touch control pen. For the circuit structure provided by the invention, the touch control pen is connected with the touch control screen through the conducting wire and the circuit board and is simple and convenient to operate. No matter how big or how small the pen point of the touch control pen is, the touch control pen can operate smoothly on the touch control screen.
Description
Technical field
The present invention relates to the circuit structure of pointer, refer in particular to the circuit structure of capacitive touch pen.
Background technology
In recent years, be accompanied by high performance and the diversified development of the various electronic equipments such as mobile phone and touch navigation system, the electronic equipment that the touch screen of light transmission is installed before the displays such as liquid crystal progressively increases.The user of such electronic equipment on one side carries out visual confirmation to being positioned at the displaying contents of the display device at the touch screen back side by touch screen, utilize the modes such as finger or pointer press touch screen to operate on one side.Various functions that thus can operating electronic equipment.
According to the difference of the principle of work of touch screen and transmission medium, existing touch screen is divided into Four types, is respectively resistance-type, condenser type, infrared-type and surface acoustic wave type.Wherein capacitance type touch control screen because of sensitivity compared with high, required touching dynamics compared with little apply comparatively extensive.
Existing capacitance type touch control screen comprises a transparency conducting layer, and this transparency conducting layer is connected with a plurality of electrodes.During use, conventionally adopt the surface of finger or a pointer touch capacitance plate, between touch objects and transparency conducting layer, form a hand capacity, electric signal between each electrode of transparency conducting layer by external circuitry sensing touch point and touch screen surface, thus can judge the position of touch points on touch screen.
Due in order to obtain better electric conductivity, the nib of pointer is generally made by metal material, but nib is generally thinner, when so pointer operates on described touch screen, the capacitance variations forming between pointer and touch screen just can not be fairly obvious, during concrete operations, the result that just may occur broken string when pointer is rule on touch screen, cause thus the sensitivity of impact operation touch screen, so we need to provide for users a kind of circuit structure of simple capacitive touch pen, it can carry out various operations easily on touch screen.
Summary of the invention
The actual technical matters to be solved of the present invention is the circuit structure how a kind of brand-new capacitive touch pen is provided, and has both solved the less problem of electric capacity that pointer produces with touch screen in use, has strengthened again the sensitivity of operation touch screen.
In order to realize above-mentioned purpose of the present invention, the invention provides a kind of circuit structure of capacitive touch pen, described pointer comprises nib and a body, described body drawn a wire and is connected on touch screen by circuit board, when described pointer is worked on described touch screen, its circuit structure mainly comprises scanning end circuit and reference edge circuit, on described scanning end circuit, pointer is loaded with a negative pulse voltage, and the equal ground connection in one end of described scanning end circuit and reference edge circuit, the other end is all connected to positive pulse end.
The circuit structure of capacitive touch pen of the present invention, described pointer is connected on touch screen by circuit board by wire, comparatively easy during operation, regardless of the nib size of pointer, operation that can both be smooth on touch screen; Moreover circuit structure of the present invention is simple, strengthened the sensitivity of operation touch screen.
Accompanying drawing explanation
Fig. 1 is according to the connection diagram of pointer of the present invention and touch screen.
Fig. 2 is the circuit structure diagram during according to pointer of the present invention work.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further illustrated.
Please refer to shown in Fig. 1, capacitive touch pen 1 of the present invention comprises nib 11 and a body 12, and described body 12 drawn a wire 2 and be connected on touch screen 3 by circuit board 4, and wherein said touch screen 3 is connected by wire with circuit board 4.When described pointer 1 is worked on described touch screen 3, its circuit structure mainly comprises scanning end circuit S and reference edge circuit R.The equal ground connection in one end of wherein said scanning end circuit S and reference edge circuit R, it is V that the other end is connected to positive pulse end
lon end.Described positive pulse V
lend is composed in parallel by capacitor C 1 and C2, and capacitor C 1 connects reference edge circuit R, capacitor C 2 connection scanning end circuit S, described V
lend is for providing charging to the electric capacity in the electric capacity of scanning end circuit S and reference edge circuit R, and described positive pulse end V
lit is the inner positive pulse producing of IC.
Described reference edge circuit R one end connects two capacitor C in parallel 3 and C5 arrives ground, and it is V to positive pulse end that the other end connects capacitor C 1
lend.Described scanning end circuit S one end connect two capacitor C in parallel 4 to and the C6 negative pulse voltage V that connects
pento ground, it is V to positive pulse end that the other end connects capacitor C 2
lend.
Due in reference edge circuit R, capacitor C 5 is the inner adjustable electric capacity of IC, and in scanning end circuit S, voltage V
penit is the negative pulse of external load.In the situation that not considering capacitor C 5 and C6, according to circuit rule, the capacitance of design capacitance C1, C2, C3 and C4 can reach the electric quantity balancing of reference edge circuit R and scanning end circuit S, is formulated as follows: Q
r=Q
s.When the described touch screen 3 of pointer 1 touching, in order to continue to keep the electric quantity balancing of reference edge circuit R and scanning end circuit S, need meet formula: V
rG* C5=(V
sG-(V
pen)) * C6.
Because described pointer 1 nib is less, so the capacitor C 6 that itself and touch screen 3 produce is far smaller than adjustable condenser C5 on reference circuit end, and voltage V in described scanning end circuit S
penthe negative pulse of external load, so voltage V
sGwith V
pendifference be one on the occasion of.So guaranteeing under the condition of described capacitive touch pen 1 circuit balancing the upper voltage V of described scanning end circuit S
sGwith V
pendifference be just far longer than the voltage V on reference edge circuit R
rG.So, even if pointer 1 is less with the capacitor C 6 that touch screen 3 produces, due to external load negative pulse V
peneffect, also can guarantee the balance of voltage of scanning end circuit S and reference edge circuit R.
The circuit structure of capacitive touch pen of the present invention, not only simple, and overcome the shortcoming that causes sensitivity to be lowered because pointer electric capacity on described touch screen is less; Moreover, even if the nib of pointer is less, realize too the smooth operation of capacitive touch pen on described touch screen.
Claims (8)
1. the circuit structure of a capacitive touch pen, described pointer comprises nib and a body, described body drawn a wire and is connected on touch screen by circuit board, when described pointer is worked on described touch screen, its circuit structure mainly comprises scanning end circuit and reference edge circuit, it is characterized in that: on described scanning end circuit, pointer is loaded with a negative pulse voltage, and the equal ground connection in one end of described scanning end circuit and reference edge circuit, the other end is all connected to positive pulse end.
2. circuit structure as claimed in claim 1, is characterized in that: described reference edge circuit one end connects two electric capacity in parallel to ground, and the other end connects an electric capacity to positive pulse end.
3. circuit structure as claimed in claim 2, is characterized in that: described reference edge circuit one end connects two electric capacity in parallel, and one of them electric capacity is the inner adjustable electric capacity of IC.
4. circuit structure as claimed in claim 1, is characterized in that: described scanning end circuit one end connects two electric capacity in parallel to negative pulse voltage described in ground and another capacitances in series one to ground, and the other end connects another electric capacity to positive pulse end.
5. circuit structure as claimed in claim 4, is characterized in that: in described scanning end circuit, negative pulse voltage is the negative pulse of external load.
6. circuit structure as claimed in claim 4, is characterized in that: described another electric capacity being in series with negative pulse voltage refers to the electric capacity that described pointer produces while operating on touch screen.
7. the circuit structure as described in claim 1 or 2 or 4, is characterized in that: described positive pulse end is the inner positive pulse producing of IC.
8. circuit structure as claimed in claim 1, is characterized in that: described touch screen is connected by wire with circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110329302.XA CN102364412B (en) | 2011-10-26 | 2011-10-26 | Circuit structure of capacitive touch control pen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110329302.XA CN102364412B (en) | 2011-10-26 | 2011-10-26 | Circuit structure of capacitive touch control pen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102364412A CN102364412A (en) | 2012-02-29 |
| CN102364412B true CN102364412B (en) | 2014-03-12 |
Family
ID=45690979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110329302.XA Active CN102364412B (en) | 2011-10-26 | 2011-10-26 | Circuit structure of capacitive touch control pen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102364412B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1894737A (en) * | 2003-09-12 | 2007-01-10 | 西奎公司 | Tethered stylyus for use with a capacitance-sensitive touchpad |
| US7612767B1 (en) * | 2005-08-24 | 2009-11-03 | Griffin Technology, Inc. | Trackpad pen for use with computer touchpad |
| CN101788858A (en) * | 2009-01-22 | 2010-07-28 | 义隆电子股份有限公司 | Contact detection method of capacitive touchpad and stylus thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8253425B2 (en) * | 2007-05-08 | 2012-08-28 | Synaptics Incorporated | Production testing of a capacitive touch sensing device |
-
2011
- 2011-10-26 CN CN201110329302.XA patent/CN102364412B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1894737A (en) * | 2003-09-12 | 2007-01-10 | 西奎公司 | Tethered stylyus for use with a capacitance-sensitive touchpad |
| US7612767B1 (en) * | 2005-08-24 | 2009-11-03 | Griffin Technology, Inc. | Trackpad pen for use with computer touchpad |
| CN101788858A (en) * | 2009-01-22 | 2010-07-28 | 义隆电子股份有限公司 | Contact detection method of capacitive touchpad and stylus thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102364412A (en) | 2012-02-29 |
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