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 PDFInfo
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- 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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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control 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
- G09G3/22—Control 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
- G09G3/30—Control 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
- G09G3/32—Control 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]
- G09G3/3208—Control 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
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.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810779715.XA CN109064956A (en) | 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 |
| 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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810779715.XA CN109064956A (en) | 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 |
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| Publication Number | Publication Date |
|---|---|
| CN109064956A true CN109064956A (en) | 2018-12-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810779715.XA Pending CN109064956A (en) | 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 |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109064956A (en) |
| WO (1) | WO2020015335A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110459179A (en) * | 2019-08-30 | 2019-11-15 | 云谷（固安）科技有限公司 | A kind of display device |
| WO2020015335A1 (en) * | 2018-07-16 | 2020-01-23 | 深圳市华星光电半导体显示技术有限公司 | Detection circuit and detection method for detecting capacitance of sense line, and oled display apparatus |
| CN116543704A (en) * | 2023-07-07 | 2023-08-04 | 惠科股份有限公司 | Compensation circuit, compensation method and display panel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2020015335A1 (en) * | 2018-07-16 | 2020-01-23 | 深圳市华星光电半导体显示技术有限公司 | Detection circuit and detection method for detecting capacitance of sense line, and oled display apparatus |
| CN110459179A (en) * | 2019-08-30 | 2019-11-15 | 云谷（固安）科技有限公司 | A kind of display device |
| CN116543704A (en) * | 2023-07-07 | 2023-08-04 | 惠科股份有限公司 | Compensation circuit, compensation method and display panel |
| CN116543704B (en) * | 2023-07-07 | 2023-09-01 | 惠科股份有限公司 | Compensation circuit, compensation method and display panel |
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| WO2020015335A1 (en) | 2020-01-23 |
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