CN104102384B - Touch detection circuit - Google Patents
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- CN104102384B CN104102384B CN201410347162.2A CN201410347162A CN104102384B CN 104102384 B CN104102384 B CN 104102384B CN 201410347162 A CN201410347162 A CN 201410347162A CN 104102384 B CN104102384 B CN 104102384B
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Abstract
A touch detection circuit is provided. The touch detection circuit comprises a touch unit, a comparison unit and a touch result generation unit. The touch unit provides a detection signal according to the touched state. The comparison unit is coupled with the touch unit and provides a reference current. The comparison unit generates a touch state current according to a voltage difference between the detection signal and the first reference voltage, and compares the reference current and the touch state current to generate a comparison voltage. The touch result generating unit is coupled to the comparator and provides a touch result signal according to the comparison voltage. The touch detection circuit of the invention can obtain the current touch state of the touch panel and the position of the touch point on the touch panel by analyzing the touch result signal.
Description
Technical field
The invention relates to a kind of touch-control circuit, and in particular to a kind of touch detection circuit.
Background technology
With the development and progress of science and technology, the user interface of electronic product also by traditional button, keyboard or mouse gradually
Develop into humanized touch interface.For example, user can utilize finger or touch-control light pen in photoinduction formula
Touch control operation is carried out on contact panel.On the other hand, often current user can be sensed using light circuit for detecting in contact panel
Position of touch.For example, Fig. 1 illustrates a kind of schematic diagram of smooth circuit for detecting 100.Light circuit for detecting 100 can be applicable to light
The contact panel of induction type is detecting the touch point position of contact panel.
Light circuit for detecting 100 includes transistor Q, electric capacity C and light detecting transistor P.Scan line SCAN1 of contact panel
Can be used to the on off state of controlling transistor Q.Light is detected transistor P and can produce different electricity under the light irradiation of varying strength
Stream Id.One end of electric capacity C is coupled to transistor Q, and the other end is then coupled to power vd D.Electric capacity C is produced for stored current Id
Raw electric charge.When transistor Q is opened, the electric charge stored in electric capacity C can be sent to the data wire of contact panel via transistor Q
DATA1.As electric current Id is different, the quantity of electric charge in electric capacity C also can be different.Therefore, light circuit for detecting 100 can be according to data wire
The quantity of electric charge received by the DATA1 touch situations current to judge contact panel.
However, when the luminous intensity detected by light detecting transistor P is not enough or sensitive time falls short of, in electric capacity C
The stored quantity of electric charge crosses that I haven't seen you for ages and causes the undertension of end points VA, causes contact panel judge the position of touch point.Separately
On the one hand, it will usually light is detected gate G and the source S two ends of transistor P voltage difference (i.e. Vgs) operate under back bias voltage with
Control electric current Id, but this easily allows light detecting transistor P that the situation of deterioration occurs.
The content of the invention
The present invention provides a kind of touch detection circuit, by increasing the photoinduction speed of touch detection circuit to lift touch-control
The photoinduction susceptibility of panel.
The touch detection circuit of the present invention includes touch control unit, comparing unit and touch-control result generation unit.Touch-control list
Unit is according to touched state providing detection signal.Comparing unit couples touch control unit and provides reference current.Comparing unit is simultaneously
Touch-control state current is produced according to the voltage difference of detection signal and the first reference voltage.Comparing unit comparison reference electric current with
And touch-control state current is producing comparison voltage.Touch-control result generation unit coupling comparator is simultaneously tactile to provide according to comparison voltage
Control consequential signal.
Based on above-mentioned, the comparing unit in the touch detection circuit of the present invention is by comparing touch control unit in different touch-controls
The voltage difference of both the detection signal provided under state and the first reference voltage is producing comparison voltage.Then, touch-control result
Generation unit can provide touch-control consequential signal according to comparison voltage.Consequently, it is possible to the touch detection circuit of the present invention can be by
The position for analyzing touch-control consequential signal to learn the current touching state of contact panel and learn touch point on contact panel.
Describe the present invention below in conjunction with the drawings and specific embodiments, but it is not as a limitation of the invention.
Description of the drawings
Fig. 1 illustrates a kind of schematic diagram of smooth circuit for detecting 100.
Fig. 2～Fig. 3 A, Fig. 4～Fig. 8 illustrates the schematic diagram of the touch detection circuit of multiple embodiments of the invention respectively.
Fig. 3 B illustrate the reading waveform diagram of Fig. 3 A touch detections circuit 300.
Wherein, reference
100：Light circuit for detecting
200、300、400、500、600、700、800：Touch detection circuit
202、302、402、502、602、702、802：Touch control unit
204、304、404、504、604、704、804：Comparing unit
206、306、406、506、606、706、806：Touch-control result generation unit
A、B：Curve
C、CT、CR：Electric capacity
DATA1、DATA3：Data line
D1～D3：Diode
F：Wave period
G：Gate
Id：Electric current
IREF1：Reference current
IT1、IT2：Touch-control state current
P, P1～P7：Light detects transistor
S：Source electrode
SCAN1、SCAN3：Scan line
SD1～SD6：Detection signal
ST1、ST2：Touch-control consequential signal
VA, VA1～VA3：End points
VCOMP、VCOMP1、VCOMP2：Comparison voltage
VREF1、VC2、VC4、T1、T2：Reference voltage
VC1、VC3：Reference voltage source
VC5：Reference power source
VDD：Power supply
Q, M1～M6, MA, MB1～MB4, MC1～MC2, MD1～MD4, MF,
MN：Transistor
Specific embodiment
Technical solution of the present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings, to be further understood that
The purpose of the present invention, scheme and effect, but it is not intended as the restriction of scope of the appended claims of the present invention.
Fig. 2 illustrates the schematic diagram of the touch detection circuit 200 of one embodiment of the invention.Touch detection circuit 200 includes touching
Control unit 202, comparing unit 204 and touch-control result generation unit 206.Touch detection circuit 200 can be applicable to photoinduction formula
Contact panel in detect contact panel on touch point position.Touch control unit 202 is according to touched state providing detecting
Signal SD1.Touch control unit 202 can include optical sensor (Photo Sensor), light detecting thin film transistor (TFT) (Thin Film
Transistor, TFT) or other have the electronic building brick of light detecting function.The luminous intensity meeting experienced by touch control unit 202
With touch control unit 202 it is whether touched and different.Under different touching states, touch control unit 202 can produce difference
Detection signal SD1.Wherein, detection signal SD1 is voltage signal.
On the other hand, comparing unit 204 can be made up of TFT or other electronic circuits with comparator function.
Comparing unit 204 can couple touch control unit 202 to receive detection signal SD1, and compare detection signal SD1 and reference voltage
The voltage difference of both VREF1, produces different touch-control state currents.Then, comparing unit 204 can by touch-control state current with
Reference current is compared, then produces comparison voltage VCOMP.It should be noted that the current value of reference current can be advance
Setting comes as benchmark.
Touch-control result generation unit 206 couples comparing unit 204, and touch-control result generation unit 206 receives comparison voltage
Understand according to comparison voltage VCOMP to provide touch-control consequential signal ST1 after VCOMP.For example, when touch control unit 202 is by user
Finger touch when, the light that touch control unit 202 is received can because by user finger cover and reduce, detection signal SD1
Voltage can be less than reference voltage VREF1 voltage.Comparing unit 204 calculates the voltage and reference voltage of detection signal SD1
The voltage difference of VREF1 is producing comparison voltage VCOMP, and comparison voltage VCOMP can be passed to touch-control result generation unit
206.Touch-control result generation unit 206 then can be amplified for comparison voltage VCOMP, and provides corresponding touch-control result letter
Number ST1.Consequently, it is possible to by touch-control consequential signal ST1, touch detection circuit 200 can learn that current touch control unit 202 is to be in
Touched state.
Understand in the same manner, when touch control unit 202 is not touched, touch control unit 202 is not because being received by object masks
More light, the voltage of detection signal SD1 can be more than the voltage of reference voltage VREF1.Consequently, it is possible to touch detection circuit
200 can learn different touch-control consequential signal ST1 by comparison voltage VCOMP different from above-mentioned example, and through different
Touch-control consequential signal ST1 do not touched by the finger of user learning touch control unit 202 at present.
More it is worth mentioning, the current value of above-mentioned reference current can be arranged on the first electric current and the second electric current
Between current value.First electric current therein is the 204 corresponding touch-control state for producing of comparing unit when touch control unit 202 has touched
Electric current, and the second electric current is then the 204 corresponding touch-control state current for producing of comparing unit when touch control unit 202 is not touched.
For example, the current value of reference current can be equal to the voltage difference of reference voltage VREF1 equal to the voltage of detection signal SD1
When 0, the current value of the touch-control state current that the correspondence of comparing unit 204 is produced.
Fig. 3 A illustrate the schematic diagram of the touch detection circuit 300 of another embodiment of the present invention.Touch detection circuit 300 includes
Touch control unit 302, comparing unit 304 and touch-control result generation unit 306.Touch control unit 302 includes diode D1 and light
Detecting transistor P1.The anode coupling reference voltage source VC1 of diode D1, the negative electrode of diode D1 provide detection signal SD2.
In this embodiment, light detects transistor P1 for N-type TFT, and light detecting transistor P1 has first end (such as drain), the second end
(such as source electrode) and control end (such as gate).The first end of light detecting transistor P1 couples the negative electrode of diode D1, and light is detectd
The second end and control end for surveying transistor P1 is mutually coupled to reference voltage VC2.From another point of view, when diode D1 leads
Fixed resistance value can be provided when logical, and light detecting transistor P1 there can be the electricity of variation as the luminous intensity for detecting is different
Resistance.Therefore, touch control unit 302 can be considered a bleeder circuit, wherein, diode D1 can be for ginseng with light detecting transistor P1
The voltage difference for examining voltage source VC1 and reference voltage VC2 carries out partial pressure to produce detection signal SD2.
Comparing unit 304 includes diode D2 and transistor M1.The anode coupling reference voltage source VC3 of diode D2,
The negative electrode of diode D2 produces comparison voltage VCOMP1.Diode D2 is to produce reference current IREF1.In this embodiment,
Transistor M1 is N-type TFT, and transistor M1 has first end (such as drain), the second end (such as source electrode) and control end is (for example
Gate).The first end of transistor M1 is coupled to the negative electrode of diode D2, and the control end of transistor M1 is to receive detection signal
Second end of SD2, transistor M1 is then coupled to reference voltage VC4.Detection signal SD2 is assumed for voltage signal, transistor M1 meetings
Touch-control state current IT1 is produced according to the voltage difference of both detection signal SD2 and reference voltage VC4.
For example, the light when the finger of user touches touch control unit 302, received by light detecting transistor P1
Line can be fewer not in contact with what is come during touch control unit 302 than the finger of user.Therefore, touch control unit 302 is in different touching states
Under, the leakage current produced by light detecting transistor P1 also can be different.In other words, the detecting provided by the cathode terminal of diode D1
Signal SD2 also can be different.Therefore, for transistor M1, touch control unit 302 under different touching states, control end and the
Voltage difference (Vgs) produced by two ends two ends also can difference, and cause touch-control state current IT1 produced by transistor M1
Differ.In this embodiment, the reference current IREF1 provided by diode D2 can be considered a fixed reference current.Than
Then compare with reference current IREF1 for different touch-control state currents IT1 compared with unit 304, then produce according to comparative result
Comparison voltage VCOMP1, detailed description refer to aftermentioned.
Touch-control result generation unit 306 includes transistor MA and transistor MN.In this embodiment, transistor MA and crystalline substance
Body pipe MN is N-type TFT.Transistor MA has first end (such as drain), the second end (such as source electrode) and control end (such as lock
Pole).The first end of transistor MA receives reference power source VC5, control end coupling comparison voltage VCOMP1 of transistor MA.Transistor
MN has first end (such as drain), the second end (such as source electrode) and control end (such as gate).The first end of transistor MN
Second end of transistor MA is coupled to, the control end of transistor MN is coupled to scan line SCAN3, and second end of transistor MN produces
Touch-control consequential signal ST2 simultaneously reaches the data line DATA3 of coupling.
Fig. 3 B illustrate the reading waveform diagram of Fig. 3 A touch detections circuit 300.Wherein, the horizontal axis plots time of Fig. 3 B,
Unit can be microsecond (μ s), and the longitudinal axis then represents voltage, and unit can be millivolt (mV), and F represents wave period.Please also refer to
Fig. 3 A and Fig. 3 B, when curve A represents touch control unit 302 and does not detect light and change, the voltage change of transistor M1 drains.It is another
Aspect, curve B represent touch control unit 302 detect light change when, the voltage change of transistor M1 drains.From curve B,
When touch control unit 302 detects light to be changed, the voltage of transistor M1 drains only needs to the time of 0.01 F and just can reach ratio
Compared with voltage VCOMP1.From another point of view, touch detection circuit 300 can reduce light detecting transistor P1 sensitive time with
Increase sensing speed.
Will be detailed below comparing unit 304 and the action relationships between the two of touch-control result generation unit 306.Relatively
Comparison voltage VCOMP1 produced by unit 304 can be transferred into the gate of transistor MA.Here, transistor MA can be used as one
Individual amplifier, and comparison voltage VCOMP1 received according to reference power source VC5 and control end is being amplified.Letter after amplification
Transistor MN number is then transferred into, and after switched on as transistor MN, the signal after amplification is transferred to number through transistor MN
According to line DATA3 producing touch-control consequential signal ST2.
Fig. 4 illustrates the schematic diagram of the touch detection circuit 400 of yet another embodiment of the invention.Touch detection circuit 400 includes
Touch control unit 402, comparing unit 404 and touch-control result generation unit 406.Touch control unit 402 includes transistor MD1 and light
Detecting transistor P2.In this embodiment, transistor MD1 is N-type TFT, transistor MD1 have first end (such as drain), the
Two ends (such as source electrode) and control end (such as gate).The first end coupling reference voltage source VC1 of transistor MD1, transistor
Second end of MD1 and control end can be coupled jointly and provide detection signal SD3.Comparing unit 404 includes transistor MB1 and crystal
Pipe M2.In this embodiment, transistor MB1 and transistor M2 are N-type TFT, transistor MB1 have first end (such as drain),
Second end (such as source electrode) and control end (such as gate).The first end of transistor MB1 receives reference voltage source VC3, crystal
The control end of pipe MB1 and the second end are commonly coupled to the first end of transistor M2.From another point of view, two in Fig. 3 A
Pole pipe D1 can be considered that the transistor MD1 in Fig. 4, diode D2 can be considered transistor MB1.On the other hand, light detecting transistor P2,
The coupling relation of transistor M2, reference voltage VC2, reference voltage VC4 and touch-control result generation unit 406 refer to Fig. 3 A,
Here is not repeated.
The operational scenario of touch detection circuit 400 is will be described below, Fig. 3 is please also refer to.Transistor MD1 is brilliant with light detecting
Body pipe P2 can be directed to the voltage difference of reference voltage source VC1 and reference voltage VC2 and carry out partial pressure to produce detection signal SD3.It is another
Aspect, as control end and second end of transistor MB1 are mutually coupled, therefore the control end of transistor MB1 and the second end two ends
Voltage difference be zero.Comparing unit 404 can the control end of comparator transistor MB1 and the voltage difference (being zero) at the second end two ends and crystalline substance
The voltage difference (voltage difference of detection signal SD3 and reference voltage VC4) at the control end of body pipe M2 and the second end two ends.When detecting letter
(for example touch unit 402 to be touched by finger) when the voltage difference of both number SD3 and reference voltage VC4 is more than zero, the electricity of end points VA1
Pressure can level off to reference voltage VC4.On the other hand, when the control end of transistor M2 is less than zero with the voltage difference at the second end two ends
(for example touching unit 402 not touched by finger), the voltage of end points VA1 can level off to reference voltage source VC3.Consequently, it is possible to touch
Unit 402 is touched under different touch situations, the voltage of end points VA1 just occurs obvious difference.
Fig. 5 illustrates the schematic diagram of the touch detection circuit 500 of further embodiment of this invention.Touch detection circuit 500 includes
Touch control unit 502, comparing unit 504 and touch-control result generation unit 506.Touch control unit 502 includes transistor MD2 and light
Detecting transistor P3.Comparing unit 504 includes transistor MB2 and transistor M3.The start situation of touch-control result generation unit 506
Refer to touch-control result generation unit 306.Please also refer to Fig. 4 and Fig. 5, touch detection circuit 400 and touch detection circuit 500
Difference be that the control end of transistor M3 and the second end receive reference voltage VC4 and detection signal SD4 respectively.However, crystal
The coupling relation of pipe M2 is with transistor M3 conversely, the control end of transistor M2 receives detection signal SD3 with ginseng respectively with the second end
Examine voltage VC4.
Fig. 6 illustrates the schematic diagram of the touch detection circuit 600 of a more embodiment of the invention.Touch detection circuit 600 includes
Touch control unit 602, comparing unit 604 and touch-control result generation unit 606.Touch control unit 602 includes transistor MD3, crystal
Pipe MC1, light detecting transistor P4 and light detecting transistor P5.Comparing unit 604 includes transistor MB3 and transistor M4.Please
With reference to Fig. 4 to Fig. 6, touch control unit 602 increases in touch control unit 602 compared with touch control unit 402 and touch control unit 502
Light detecting transistor P5 and transistor MC1 is added.Light detecting transistor P5 and transistor MC1 can be directed to reference voltage source
The voltage difference of VC1 and reference voltage VC4 carries out partial pressure to produce reference voltage T1.The control end of transistor M4 receives detection signal
Second end of SD5, transistor M4 then receives reference voltage T1.
In another embodiment, transistor MD3 can be replaced with diode, and the anode of diode is coupled to reference voltage
Source VC1, the negative electrode of diode is to provide detection signal SD5.On the other hand, transistor MC1 can also be replaced with diode,
The anode of diode is coupled to reference voltage source VC1, and the negative electrode of diode is to provide reference voltage T1.In the embodiment of Fig. 6
In, when light detecting transistor P4 and light detect the intensity of illumination suffered by transistor P5 to be changed, detection signal SD5 is electric with reference
Pressure T1 also can change therewith.On the other hand, Fig. 4 to Fig. 6 is refer to, second end of transistor M2 and transistor M3 in Fig. 5 in Fig. 4
Control end be all coupled to reference voltage VC4 (can be considered a fixed voltage).However, the control end of transistor M4 (connects
Receive detection signal SD5) there can be larger amplitude as luminous intensity is different from the voltage difference at the second end (receiving reference voltage T1) two ends
The change of degree, and use the susceptibility for lifting touch detection.
Fig. 7 illustrates the schematic diagram of the touch detection circuit 700 of further embodiment of this invention.Touch detection circuit 700 includes
Touch control unit 702, comparing unit 704 and touch-control result generation unit 706.Touch control unit 702 includes transistor MD4, crystal
Pipe MC2, light detecting transistor P6 and light detecting transistor P7.Comparing unit 704 include transistor MF, transistor MB4 and
Transistor M5.In this embodiment, transistor MF, transistor MB4 and transistor M5 are N-type TFT.Transistor MF has first
End (such as drain), the second end (such as source electrode) and control end (such as gate).The first end coupling of transistor MF is with reference to electricity
Second end of potential source VC3, transistor MF produces comparison voltage VCMOP2.The of the first end coupling transistors MF of transistor MB4
Two ends, the second end and the control end of transistor MB4 are commonly coupled to the control end of transistor MF.In another embodiment, crystal
Pipe MB4 can be replaced with diode, and the anode of diode is coupled to second end of transistor MF, and the negative electrode of diode is then coupled to
The control end of transistor MF.Diode can be used to produce reference current.
Transistor M5 has first end (such as drain), the second end (such as source electrode) and control end (such as gate).It is brilliant
Second end of the first end coupling transistors MB4 of body pipe M5, the control end of transistor M5 receive detection signal SD6, transistor M5
The second end coupling reference voltage T2.Transistor MF is produced according to the voltage difference of detection signal SD6 and both reference voltage T2
Touch-control state current IT2.Please also refer to Fig. 6 and Fig. 7, it is notable that by comparing unit 704 and 604 phase of comparing unit
Than transistor MF is increased in comparing unit 704.Transistor MF can be limited and be flowed to transistor MC2 and light detecting transistor P7's
Size of current, can limit the operating current of the consumption of touch detection circuit 700.
Fig. 8 illustrates the schematic diagram of the touch detection circuit 800 of another embodiment of the present invention.Touch detection circuit 800 can be fitted
For capacitance type touch-control panel.Touch detection circuit 800 includes that touch control unit 802, comparing unit 804 and touch-control result are produced
Unit 806.Touch control unit 802 includes touch detection electric capacity CT and reference capacitance CR.The first end of touch detection electric capacity CT is received
Second end of detection signal SD7, touch detection electric capacity CT is then used for providing detection signal SD7.Reference capacitance CR is serially connected in touch-control
Detect second end of electric capacity CT and with reference between earth terminal GND.Touch-control result generation unit 806 can be Analog-digital Converter
Device.In this embodiment, touch-control result generation unit 806 can learn touching for contact surface plate by the voltage change of end points VA3
Touch situation.
In sum, touch detection circuit of the invention can utilize touch control unit according to the different touch-control state of contact panel
Different detection signals are provided.Then, after comparing unit receives detection signal, can by detection signal compared with reference voltage with
Produce comparison voltage.Finally, the signal of comparison voltage can be amplified and provide touch-control result letter by touch-control result generation unit
Number.Consequently, it is possible to the touch detection circuit of the present invention just can learn the touch-control situation of contact panel according to touch-control consequential signal.
In other words, touch detection circuit of the invention is by the produced voltage difference under different touch-control states of analysis contact panel
To judge the touching situation of current contact panel, to the susceptibility for lifting detecting.Therefore, touch detection circuit of the invention can
The light application time saved required for light detecting transistor, to increase detecting speed and sensitiveness.
Certainly, the present invention can also have other various embodiments, in the case of without departing substantially from spirit of the invention and its essence, ripe
Know those skilled in the art and work as and various corresponding changes and deformation, but these corresponding changes and change can be made according to the present invention
Shape should all belong to the protection domain of appended claims of the invention.
Claims (11)
1. a kind of touch detection circuit, it is characterised in that include：
One touch control unit, according to touched state providing a detection signal；
One comparing unit, couples the touch control unit, there is provided a reference current, the comparing unit according to the detection signal and
Producing a touch-control state current, the comparing unit compares the reference current and the touch-control shape to the voltage difference of the first reference voltage
State electric current is producing a comparison voltage；And
One touch-control result generation unit, couples the comparing unit, and a touch-control consequential signal is provided according to the comparison voltage；
Wherein, the comparing unit includes：
One diode, its anode couple a reference voltage source, and its negative electrode produces the comparison voltage, and the diode is to produce the ginseng
Examine electric current；And
One the first transistor, with first end, the second end and control end, the first end of the first transistor is coupled to two pole
The negative electrode of pipe, one of the second end of the first transistor and control end receive the detection signal, and the first transistor
The second end and control end wherein another coupling first reference voltage, the first transistor according to the detection signal and
The voltage difference of first reference voltage is producing the touch-control state current.
2. touch detection circuit as claimed in claim 1, it is characterised in that the touch control unit includes：
One diode, its anode couple a reference voltage source, and its negative electrode provides the detection signal；And
One light detects transistor, and with first end, the second end and control end, its first end couples the diode of the touch control unit
Negative electrode, the second end of light detecting transistor and control end are mutually coupled to one second reference voltage.
3. touch detection circuit as claimed in claim 2, it is characterised in that the diode of the touch control unit is a transistor,
With first end, the second end and control end, the first end of the transistor couples the reference voltage source, the second end of the transistor
And control end is coupled jointly and provides the detection signal.
4. touch detection circuit as claimed in claim 2, it is characterised in that the light detect transistor and the diode to
Voltage difference of the reference voltage source with second reference voltage is carried out partial pressure to produce the detection signal.
5. touch detection circuit as claimed in claim 1, it is characterised in that the diode is a transistor seconds, with the
One end, the second end and control end, the first end of the transistor seconds receive the reference voltage source, the control of the transistor seconds
End and the second end are coupled to the first end of the first transistor altogether.
6. touch detection circuit as claimed in claim 1, it is characterised in that the touch control unit includes：
One first diode, its anode couple a reference voltage source, and its negative electrode provides the detection signal；
One first light detects transistor, and with first end, the second end and control end, its first end couples first diode
Negative electrode, the second end of the first light detecting transistor and control end are mutually coupled to one second reference voltage；
One second diode, its anode couple the reference voltage source, and its negative electrode provides first reference voltage；And
One second light detects transistor, and with first end, the second end and control end, its first end couples second diode
Negative electrode, the second end of the second light detecting transistor and control end are mutually coupled to one the 3rd reference voltage.
7. touch detection circuit as claimed in claim 1, it is characterised in that the touch-control result generation unit includes：
One the first transistor, with first end, the second end and control end, its first end receives a reference power source, and this is first brilliant
The control end of body pipe couples the comparison voltage；And
One transistor seconds, with first end, the second end and control end, its first end is coupled to the second of the first transistor
End, the control end of the transistor seconds receive one scan signal, and the second end of the transistor seconds produces the touch-control consequential signal.
8. touch detection circuit as claimed in claim 1, it is characterised in that the touch control unit includes：
One touch detection electric capacity, with first end and the second end, the first end of the touch detection electric capacity receives a detection signal, should
Second end of touch detection electric capacity provides the detection signal；And
One reference capacitance, is serially connected in second end and of the touch detection electric capacity with reference between earth terminal.
9. touch detection circuit as claimed in claim 8, it is characterised in that the touch-control result generation unit is that simulation numeral turns
Parallel operation.
10. a kind of touch detection circuit, it is characterised in that include：
One touch control unit, according to touched state providing a detection signal；
One comparing unit, couples the touch control unit, there is provided a reference current, the comparing unit according to the detection signal and
Producing a touch-control state current, the comparing unit compares the reference current and the touch-control shape to the voltage difference of the first reference voltage
State electric current is producing a comparison voltage；And
One touch-control result generation unit, couples the comparing unit, and a touch-control consequential signal is provided according to the comparison voltage；
Wherein, the comparing unit includes：
One the first transistor, with first end, the second end and control end, its first end couples a reference voltage source, and which second
End produces the comparison voltage；
One diode, its anode couple the second end of the first transistor, and its negative electrode is coupled to the control end of the first transistor,
The diode is to produce the reference current；And
One transistor seconds, with first end, the second end and control end, the first end of the first transistor is coupled to two pole
The negative electrode of pipe, the control end of the transistor seconds receive the detection signal, and the second end of the transistor seconds couple this first
Reference voltage, the first transistor produce the touch-control state according to the voltage difference of the detection signal and first reference voltage
Electric current.
11. touch detection circuits as claimed in claim 10, it is characterised in that the diode is a third transistor, is had
First end, the second end and control end, the first end of the third transistor are coupled to the second end of the first transistor, and the 3rd
Second end of transistor and control end are commonly coupled to the first end of the transistor seconds.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW103112162A TWI505158B (en) | 2014-04-01 | 2014-04-01 | Touch control detection circuit |
| TW103112162 | 2014-04-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104102384A CN104102384A (en) | 2014-10-15 |
| CN104102384B true CN104102384B (en) | 2017-03-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410347162.2A Active CN104102384B (en) | 2014-04-01 | 2014-07-21 | Touch detection circuit |
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| Country | Link |
|---|---|
| CN (1) | CN104102384B (en) |
| TW (1) | TWI505158B (en) |
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| CN104461801B (en) * | 2014-11-28 | 2017-11-07 | 广东欧珀移动通信有限公司 | A kind of method of testing and system of touch-screen susceptibility |
| TWI734069B (en) * | 2018-01-17 | 2021-07-21 | 矽創電子股份有限公司 | Frequency detection circuit |
| CN111833781A (en) * | 2019-03-29 | 2020-10-27 | 光远科技股份有限公司 | Light emitting diode circuit and touch detection method |
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| CN102314268A (en) * | 2010-06-30 | 2012-01-11 | 盛群半导体股份有限公司 | Capacitance-type touch device |
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| TWI355631B (en) * | 2006-08-31 | 2012-01-01 | Au Optronics Corp | Liquid crystal display with a liquid crystal touch |
| KR101074795B1 (en) * | 2009-07-03 | 2011-10-19 | 삼성모바일디스플레이주식회사 | Light sensing circuit, touch panel comprising the same, and driving method of the light sensing circuit |
| TWI526899B (en) * | 2011-10-24 | 2016-03-21 | 友達光電股份有限公司 | Optical touch circuit and liquied crystal display thereof |
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| TW201215122A (en) * | 2010-02-12 | 2012-04-01 | Semiconductor Energy Lab | Semiconductor device and display device including the same |
| CN102314268A (en) * | 2010-06-30 | 2012-01-11 | 盛群半导体股份有限公司 | Capacitance-type touch device |
| CN101900904A (en) * | 2010-07-19 | 2010-12-01 | 友达光电股份有限公司 | Panel display with touch function and touch panel |
| CN102446037A (en) * | 2010-10-06 | 2012-05-09 | 剑扬股份有限公司 | Touch system and recognition method |
Also Published As
| Publication number | Publication date |
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| TW201539283A (en) | 2015-10-16 |
| TWI505158B (en) | 2015-10-21 |
| CN104102384A (en) | 2014-10-15 |
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