CN109064956A - For detecting the circuit for detecting of sensing line capacitance and sensing line capacitance method for detecting and OLED display - Google Patents

For detecting the circuit for detecting of sensing line capacitance and sensing line capacitance method for detecting and OLED display Download PDF

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Publication number
CN109064956A
CN109064956A CN201810779715.XA CN201810779715A CN109064956A CN 109064956 A CN109064956 A CN 109064956A CN 201810779715 A CN201810779715 A CN 201810779715A CN 109064956 A CN109064956 A CN 109064956A
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China
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detecting
switch
voltage
capacitance
control
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CN201810779715.XA
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Chinese (zh)
Inventor
邝继木
解红军
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深圳市华星光电半导体显示技术有限公司
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Priority to CN201810779715.XA priority Critical patent/CN109064956A/en
Publication of CN109064956A publication Critical patent/CN109064956A/en

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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/006Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]

Abstract

The present invention provides a kind of circuit for detecting and sensing line capacitance method for detecting and OLED display for detecting sensing line capacitance.Circuit for detecting for detecting sensing line capacitance of the invention includes the detecting module being electrically connected with sense wire, and detecting module includes first switch, second switch, third switch, operational amplifier, storage capacitance and processing unit.When work, by the conducting and disconnection that control first switch, second switch, third switch, first making the parasitic capacitance both ends pressure difference between sense wire and ground terminal is the first reference voltage, then making the variation of parasitic capacitance both ends pressure difference is the second reference voltage, processing unit calculates the capacitance of the parasitic capacitance between the sense wire and ground terminal according to the voltage and preset parasitic capacitance value calculation formula of operational amplifier output terminal, easy to operate, detecting result is accurate.

Description

For detect sensing line capacitance circuit for detecting and sensing line capacitance method for detecting with OLED display

Technical field

The present invention relates to field of display technology more particularly to it is a kind of for detect sensing line capacitance circuit for detecting and sensing Line capacitance method for detecting and OLED display.

Background technique

Organic Light Emitting Diode (Organic Light Emitting Display, OLED) display device has spontaneous Light, driving voltage are low, luminous efficiency is high, the response time is short, clarity and contrast are high, nearly 180 ° of visual angles, use temperature ranges It many advantages, such as wide, achievable Flexible Displays and large area total colouring, is known as being the display for most having development potentiality by industry Device.

OLED is current driving apparatus, when there is electric current to flow through Organic Light Emitting Diode, organic light-emitting diode, and Light emission luminance is determined by the electric current for flowing through Organic Light Emitting Diode itself.Most of existing integrated circuit (Integrated Circuit, IC) voltage signal is all only transmitted, therefore the pixel-driving circuit of OLED needs to complete that voltage signal is changed into electric current The task of signal.

In the prior art, each pixel of OLED display includes an OLED device and for driving the OLED device The luminous pixel-driving circuit of part.The driving thin film transistor (TFT) connecting with OLED device is provided in the pixel-driving circuit (TFT), it shines for voltage signal to be converted to current signal driving OLED device.OLED display in use can There is the problem of driving thin film transistor (TFT) threshold voltage shift and OLED device generation aging, and then influences display quality, because This, which is generally required, removes compensation driving thin film transistor (TFT) threshold voltage shift and OLED device aging using compensation technique.Compensation technique A plurality of sense wire (sense line) would generally be used to obtain the voltage of key node in each pixel-driving circuit.Every sensing All there is parasitic capacitance between line and ground terminal, and the parasitic capacitance between each sense wire and ground terminal is not of uniform size, And then it leads to the problem of and a plurality of sense wire is charged into Time Inconsistency used in identical voltage.Therefore, how sense wire is detected Capacitor between ground terminal is a current technical problem urgently to be solved.

Summary of the invention

The purpose of the present invention is to provide a kind of for detecting the circuit for detecting of sensing line capacitance, can be simply and accurately Detect the parasitic capacitance between sense wire and ground terminal.

Another object of the present invention is to provide a kind of sensing line capacitance method for detecting, can simply and accurately detect sense Parasitic capacitance between survey line and ground terminal.

Another object of the present invention is to provide a kind of OLED display, can simply and accurately detect sense wire with Parasitic capacitance between ground terminal.

To achieve the above object, present invention firstly provides a kind of for detecting the circuit for detecting of sensing line capacitance, the sense Parasitic capacitance is formed between survey line and ground terminal, the circuit for detecting for detecting sensing line capacitance includes and sense wire electrical property The detecting module of connection;

The detecting module includes first switch, second switch, third switch, operational amplifier, storage capacitance and processing Unit;The control terminal of the first switch accesses first switch signal, and first end is electrically connected first node and is electrically connected institute Sense wire is stated, second end is electrically connected the output end of operational amplifier;The control terminal access second switch letter of the second switch Number, first end is electrically connected the non-inverting input terminal of operational amplifier, and second end accesses the first reference voltage;The third switch Control terminal accesses third switching signal, and first end is electrically connected the non-inverting input terminal of operational amplifier, the second ginseng of second end access Examine voltage;The first end of the storage capacitance is electrically connected first node, and second end is electrically connected the output end of operational amplifier; The inverting input terminal of the operational amplifier is electrically connected first node;The processing unit is electrically connected the defeated of operational amplifier Outlet calculates the capacitor of the parasitic capacitance between the sense wire and ground terminal for the voltage according to operational amplifier output terminal Value.

The working condition for detecting the circuit for detecting of sensing line capacitance includes: first stage and second stage;

In the first stage, the first switch signal control first switch conducting, the second switch signal control second Switch conduction, the third switching signal control third switch disconnect, and the voltage of first node is made to charge to the first reference voltage;

In second stage, the first switch signal control first switch is disconnected, the second switch signal control second Switch disconnects, and the third switching signal controls third switch conduction, changes the voltage of first node by the first reference voltage To the second reference voltage, then the processing unit is according to the voltage and preset parasitic capacitance value meter of operational amplifier output terminal Calculate the capacitance that formula calculates the parasitic capacitance between the sense wire and ground terminal.

Second reference voltage is less than the first reference voltage.

The preset parasitic capacitance calculation formula are as follows:

Cp=(V2-Vout) × Ct/ (V1-V2);

Wherein, the capacitance of parasitic capacitance of the Cp between sense wire and ground terminal, Ct are the capacitance of storage capacitance, V1 For the first reference voltage, V2 is the second reference voltage, and Vout is the voltage of the operational amplifier output terminal in second stage.

In the first stage, the first switch signal is high potential;The second switch signal is high potential;The third Switching signal is low potential;

In second stage, the first switch signal is low potential;The second switch signal is low potential;The third Switching signal is high potential.

The processing unit is analog-digital converter.

The detecting module is set on a sensor chip.

The present invention also provides a kind of sensing line capacitance method for detecting, applied to above-mentioned for detecting detecing for sensing line capacitance Slowdown monitoring circuit includes the following steps:

Step S1, into the first stage;

The first switch signal control first switch conducting, the second switch signal control second switch conducting, institute It states third switching signal control third switch to disconnect, the voltage of first node is made to charge to the first reference voltage;

Step S2, into second stage;

The first switch signal control first switch disconnects, and the second switch signal control second switch disconnects, institute Third switching signal control third switch conduction is stated, the voltage of first node is made to be changed to second with reference to electricity by the first reference voltage Pressure, then the processing unit calculates institute according to the voltage of operational amplifier output terminal and preset parasitic capacitance value calculation formula State the capacitance of the parasitic capacitance between sense wire and ground terminal.

The present invention also provides a kind of OLED displays, including above-mentioned for detecting the circuit for detecting of sensing line capacitance.

Beneficial effects of the present invention: the circuit for detecting sense wire and and sense wire for being used to detect sensing line capacitance of the invention The detecting module of electric connection, detecting module include first switch, second switch, third switch, operational amplifier, storage capacitance And processing unit.When work, by controlling the conducting and disconnection of first switch, second switch, third switch, first make sense wire Parasitic capacitance both ends pressure difference between ground terminal is the first reference voltage, and then making the variation of parasitic capacitance both ends pressure difference is the Two reference voltages, processing unit calculate institute according to the voltage of operational amplifier output terminal and preset parasitic capacitance value calculation formula The capacitance of the parasitic capacitance between sense wire and ground terminal is stated, easy to operate, detecting result is accurate.Sense wire electricity of the invention The parasitic capacitance between sense wire and ground terminal can simply and effectively be detected by holding method for detecting.OLED display of the invention The parasitic capacitance between sense wire and ground terminal can simply and effectively be detected.

Detailed description of the invention

For further understanding of the features and technical contents of the present invention, it please refers to below in connection with of the invention detailed Illustrate and attached drawing, however, the drawings only provide reference and explanation, is not intended to limit the present invention.

In attached drawing,

Fig. 1 is the circuit diagram of the circuit for detecting for detecting sensing line capacitance of the invention;

Fig. 2 is the timing diagram of the circuit for detecting for detecting sensing line capacitance of the invention;

Fig. 3 is the flow chart of sensing line capacitance method for detecting of the invention;

Fig. 4 is the structural schematic diagram of OLED display of the invention.

Specific embodiment

Further to illustrate technological means and its effect adopted by the present invention, below in conjunction with preferred implementation of the invention Example and its attached drawing are described in detail.

Referring to Fig. 1, the present invention provide it is a kind of for detect sensing line capacitance circuit for detecting, the sense wire 10 with connect Parasitic capacitance Cp is formed between ground terminal, the circuit for detecting for detecting sensing line capacitance includes being electrically connected with sense wire 10 Detecting module 20.

The detecting module 20 includes first switch K1, second switch K2, third switch K3, operational amplifier 21, storage Capacitor Ct and processing unit 22.The control terminal of the first switch K1 accesses first switch signal SW1, and first end is electrically connected the One node a is simultaneously electrically connected the sense wire 10, and second end is electrically connected the output end of operational amplifier 21.The second switch The control terminal of K2 accesses second switch signal SW2, and first end is electrically connected the non-inverting input terminal of operational amplifier 21, the second termination Enter the first reference voltage V1.The control terminal of the third switch K3 accesses third switching signal SW3, and first end is electrically connected operation The non-inverting input terminal of amplifier 21, second end access the second reference voltage V2.The first end of the storage capacitance Ct is electrically connected First node a, second end are electrically connected the output end of operational amplifier 21.The inverting input terminal of the operational amplifier 21 is electrical Connect first node a.The processing unit 22 is electrically connected the output end of operational amplifier 21, for according to operational amplifier 21 The voltage of output end calculates the capacitance of the parasitic capacitance Cp between the sense wire 10 and ground terminal.

Specifically, the processing unit 22 is analog-digital converter ADC.

Specifically, the detecting module 20 is set on a sensor chip 30.

Specifically, referring to Fig. 2, and combining Fig. 1, the working condition of the circuit for detecting for being used to detect sensing line capacitance It include: first stage t1 and second stage t2.

T1 in the first stage, the first switch signal SW1 are high potential, and control first switch K1 is connected, described second Switching signal SW2 is high potential, and control second switch K2 conducting, the third switching signal SW3 is low potential, and control third is opened It closes K3 to disconnect, at this point, the output end of the operational amplifier 21 and inverting input terminal are shorted, operational amplifier 21 is made to be equivalent to one Follower, the voltage of output end and the voltage of non-inverting input terminal are identical, make the inverting input terminal namely of operational amplifier 21 The voltage of one node a charges to the first reference voltage V1, so that the parasitic capacitance formed between sense wire 10 and ground terminal The both ends Cp pressure difference is also the first reference voltage V1.

It is low potential in second stage t2, the first switch signal SW1, control first switch K1 is disconnected, and described second Switching signal SW2 is low potential, and control second switch K2 is disconnected, and the third switching signal SW3 is high potential, and control third is opened K3 conducting is closed, at this point, the voltage of first node a can be changed to the second reference voltage V2 by the first reference voltage V1, correspondingly, sense The both ends the parasitic capacitance Cp pressure difference formed between survey line 10 and ground terminal is also changed to second with reference to electricity by the first reference voltage V1 Press V2, after voltage stabilization, voltage and preset parasitic capacitance of the processing unit 22 according to 21 output end of operational amplifier Value calculation formula calculates the capacitance of the parasitic capacitance Cp between the sense wire 10 and ground terminal.In preferred implementation of the invention In example, the second reference voltage V2 is less than the first reference voltage V1, the preset parasitic capacitance calculation formula are as follows:

Cp=(V2-Vout) × Ct/ (V1-V2);

Wherein, the capacitance of parasitic capacitance Cp of the Cp between sense wire 10 and ground terminal, Ct are the electricity of storage capacitance Ct Capacitance, it is that operational amplifier 21 exports in second stage that V1, which is the second reference voltage V1, Vout for the first reference voltage V1, V2, The voltage at end.Circuit for detecting for detecting sensing line capacitance of the invention can simply and effectively detect sense wire 10 and ground connection Parasitic capacitance Cp between end compensates parasitic capacitance Cp when charging to sense wire 10 convenient for subsequent.

Referring to Fig. 3, and combine Fig. 1 and Fig. 2, based on the same inventive concept, the present invention also provides a kind of sensing line capacitances Method for detecting, applied to above-mentioned for detecting the circuit for detecting of sensing line capacitance, herein no longer to for detecting sensing line capacitance Circuit for detecting do repeated description.The sensing line capacitance method for detecting includes the following steps:

Step S1, into first stage t1.

The first switch signal SW1 control first switch K1 conducting, the second switch signal SW2 control second switch K2 conducting, the third switching signal SW3 control third switch K3 are disconnected, and the voltage of first node a is made to charge to the first reference Voltage V1.

Specifically, in the step S1, the first switch signal SW1 is high potential, control first switch K1 conducting.Institute Stating second switch signal SW2 is high potential, control second switch K2 conducting.The third switching signal SW3 is low potential, control Third switch K3 is disconnected.At this point, the output end of the operational amplifier 21 and inverting input terminal are shorted, make 21 phase of operational amplifier When in a follower, the voltage of output end and the voltage of non-inverting input terminal are identical, the inverting input terminal of operational amplifier 21 That is the voltage of first node a charges to the first reference voltage V1, so that the parasitism formed between sense wire 10 and ground terminal The both ends capacitor Cp pressure difference is also the first reference voltage V1.

Step S2, into second stage t2.

The first switch signal SW1 control first switch K1 is disconnected, and the second switch signal SW2 controls second switch K2 is disconnected, and the third switching signal SW3 control third switch K3 conducting makes the voltage of first node a by the first reference voltage V1 is changed to the second reference voltage V2, and then the processing unit 22 is according to the voltage of 21 output end of operational amplifier and preset Parasitic capacitance value calculation formula calculates the capacitance of the parasitic capacitance Cp between the sense wire 10 and ground terminal.

Specifically, in the step S2, the first switch signal SW1 is low potential, and control first switch K1 is disconnected.Institute Stating second switch signal SW2 is low potential, and control second switch K2 is disconnected.The third switching signal SW3 is high potential, control Third switch K3 conducting.At this point, the voltage of first node a can be changed to the second reference voltage V2, phase by the first reference voltage V1 It answers, the both ends the parasitic capacitance Cp pressure difference formed between sense wire 10 and ground terminal is also changed to second by the first reference voltage V1 Reference voltage V2, after voltage stabilization, the processing unit 22 is according to the voltage of 21 output end of operational amplifier and preset posts Raw capacitance calculation formula calculates the capacitance of the parasitic capacitance Cp between the sense wire 10 and ground terminal.Of the invention excellent It selects in embodiment, the second reference voltage V2 is less than the first reference voltage V1, the preset parasitic capacitance calculation formula are as follows:

Cp=(V2-Vout) × Ct/ (V1-V2);

Wherein, the capacitance of parasitic capacitance Cp of the Cp between sense wire 10 and ground terminal, Ct are the electricity of storage capacitance Ct Capacitance, it is that operational amplifier 21 exports in second stage that V1, which is the second reference voltage V1, Vout for the first reference voltage V1, V2, The voltage at end.Sensing line capacitance method for detecting of the invention can simply and effectively detect posting between sense wire 10 and ground terminal Raw capacitor Cp, convenient for being compensated in the subsequent charging to sense wire 10 to parasitic capacitance Cp.

Referring to Fig. 4, and combine Fig. 1 and Fig. 2, the present invention also provides a kind of OLED display, including above-mentioned for detecing Survey the circuit for detecting of sensing line capacitance.

Specifically, referring to Fig. 4, the OLED display includes substrate 40, on substrate 40 and is parallel to each other A plurality of sense wire 10 and respectively multiple circuit for detecting for being used to detect sensing line capacitance corresponding with a plurality of sense wire 10.Into one Step ground, the OLED display further includes multiple sensor chips 30, and each sensor chip 30 is at least right with a sense wire 10 It answers, the circuit for detecting for detecting sensing line capacitance corresponding with a sense wire 10 is arranged in the corresponding sensing core of sense wire 10 On piece 30.

It should be noted that OLED display of the invention includes above-mentioned for detecting the circuit of sensing line capacitance, The parasitic capacitance Cp between sense wire 10 and ground terminal can be detected, simply and effectively convenient for when charging to sense wire 10 Carry out corresponding voltage compensation.It is further noted that OLED display of the invention further includes being arranged on substrate 40 Multiple pixels (not shown), switching thin-film transistor is equipped in each pixel, between sense wire 10 and ground terminal During the entire process of parasitic capacitance Cp is detected, need to keep the switching thin-film transistor of each pixel of OLED display to close It closes, so that reconnaissance phase is shown without picture, pixel current is avoided to have an impact parasitic capacitance detecting result.

In conclusion the circuit for detecting for detecting sensing line capacitance of the invention includes detecing with what sense wire was electrically connected Module is surveyed, detecting module includes first switch, second switch, third switch, operational amplifier, storage capacitance and processing unit. When work, by controlling the conducting and disconnection of first switch, second switch, third switch, first make sense wire and ground terminal it Between parasitic capacitance both ends pressure difference be the first reference voltage, then make parasitic capacitance both ends pressure difference variation for second with reference to electricity Pressure, processing unit calculate the sense wire according to the voltage of operational amplifier output terminal and preset parasitic capacitance value calculation formula The capacitance of parasitic capacitance between ground terminal, easy to operate, detecting result is accurate.Sensing line capacitance detecting side of the invention Method can simply and effectively detect the parasitic capacitance between sense wire and ground terminal.OLED display of the invention can be simple Effectively detect the parasitic capacitance between sense wire and ground terminal.

The above for those of ordinary skill in the art can according to the technique and scheme of the present invention and technology Other various corresponding changes and modifications are made in design, and all these change and modification all should belong to the claims in the present invention Protection scope.

Claims (9)

1. it is a kind of for detecting the circuit for detecting of sensing line capacitance, parasitic capacitance is formed between the sense wire (10) and ground terminal (Cp);It is characterised in that it includes the detecting module (20) being electrically connected with sense wire (10);
The detecting module (20) includes first switch (K1), second switch (K2), third switch (K3), operational amplifier (21), storage capacitance (Ct) and processing unit (22);The control terminal of the first switch (K1) accesses first switch signal (SW1), first end is electrically connected first node (a) and is electrically connected the sense wire (10), and second end is electrically connected operation and puts The output end of big device (21);The control terminal of the second switch (K2) accesses second switch signal (SW2), and first end is electrically connected The non-inverting input terminal of operational amplifier (21), second end access the first reference voltage (V1);The control of the third switch (K3) It terminates into third switching signal (SW3), first end is electrically connected the non-inverting input terminal of operational amplifier (21), second end access the Two reference voltages (V2);The first end of the storage capacitance (Ct) is electrically connected first node (a), and second end is electrically connected operation The output end of amplifier (21);The inverting input terminal of the operational amplifier (21) is electrically connected first node (a);The processing Unit (22) is electrically connected the output end of operational amplifier (21), for being calculated according to the voltage of operational amplifier (21) output end The capacitance of parasitic capacitance (Cp) between the sense wire (10) and ground terminal.
2. as described in claim 1 for detecting the circuit for detecting of sensing line capacitance, which is characterized in that described for detecting sense The working condition of the circuit for detecting of survey line capacitor includes: first stage (t1) and second stage (t2);
(t1) in the first stage, first switch signal (SW1) control first switch (K1) conducting, the second switch signal (SW2) control second switch (K2) conducting, third switching signal (SW3) the control third switch (K3) disconnect, and make first segment The voltage of point (a) charges to the first reference voltage (V1);
At second stage (t2), first switch signal (SW1) control first switch (K1) is disconnected, the second switch signal (SW2) control second switch (K2) disconnects, and third switching signal (SW3) control third switch (K3) conducting makes first segment The voltage of point (a) is changed to the second reference voltage (V2) by the first reference voltage (V1), then processing unit (22) basis The voltage of operational amplifier (21) output end and preset parasitic capacitance value calculation formula calculate the sense wire (10) and ground connection The capacitance of parasitic capacitance (Cp) between end.
3. as claimed in claim 2 for detecting the circuit for detecting of sensing line capacitance, which is characterized in that described second with reference to electricity Press (V2) less than the first reference voltage (V1).
4. as claimed in claim 3 for detecting the circuit for detecting of sensing line capacitance, which is characterized in that the preset parasitism Capacitor calculation formula are as follows:
Cp=(V2-Vout) × Ct/ (V1-V2);
Wherein, the capacitance of parasitic capacitance (Cp) of the Cp between sense wire (10) and ground terminal, Ct are storage capacitance (Ct) Capacitance, V1 are the first reference voltage (V1), and V2 is the second reference voltage (V1), and Vout is the operational amplifier in second stage (21) voltage of output end.
5. as claimed in claim 2 for detecting the circuit for detecting of sensing line capacitance, which is characterized in that in the first stage (t1), the first switch signal (SW1) is high potential;The second switch signal (SW2) is high potential;The third switch Signal (SW3) is low potential;
At second stage (t2), the first switch signal (SW1) is low potential;The second switch signal (SW2) is low electricity Position;The third switching signal (SW3) is high potential.
6. as described in claim 1 for detecting the circuit for detecting of sensing line capacitance, which is characterized in that the processing unit (22) it is analog-digital converter (ADC).
7. as described in claim 1 for detecting the circuit for detecting of sensing line capacitance, which is characterized in that the detecting module (20) it is set on a sensor chip (30).
8. a kind of sensing line capacitance method for detecting, which is characterized in that described in any item for detecing applied to such as claim 1-7 Survey the circuit for detecting of sensing line capacitance, which comprises the steps of:
Step S1, into first stage (t1);
First switch signal (SW1) control first switch (K1) conducting, second switch signal (SW2) control second are opened (K2) conducting is closed, third switching signal (SW3) the control third switch (K3) disconnects, and the voltage of first node (a) is made to charge To the first reference voltage (V1);
Step S2, into second stage (t2);
First switch signal (SW1) control first switch (K1) disconnects, and second switch signal (SW2) control second is opened It closes (K2) to disconnect, the third switching signal (SW3) control third switch (K3) conducting, makes the voltage of first node (a) by the One reference voltage (V1) is changed to the second reference voltage (V2), and then the processing unit (22) is defeated according to operational amplifier (21) The voltage of outlet and preset parasitic capacitance value calculation formula calculate the parasitic capacitance between the sense wire (10) and ground terminal (Cp) capacitance.
9. a kind of OLED display, which is characterized in that described in any item for detecting sense wire including such as claim 1-7 The circuit for detecting of capacitor.
CN201810779715.XA 2018-07-16 2018-07-16 For detecting the circuit for detecting of sensing line capacitance and sensing line capacitance method for detecting and OLED display CN109064956A (en)

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PCT/CN2018/124830 WO2020015335A1 (en) 2018-07-16 2018-12-28 Detection circuit and detection method for detecting capacitance of sense line, and oled display apparatus

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