CN106295540B - The method that display driving and fingerprint image acquisition is realized using single device - Google Patents
The method that display driving and fingerprint image acquisition is realized using single device Download PDFInfo
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- CN106295540B CN106295540B CN201610630087.XA CN201610630087A CN106295540B CN 106295540 B CN106295540 B CN 106295540B CN 201610630087 A CN201610630087 A CN 201610630087A CN 106295540 B CN106295540 B CN 106295540B
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- photo tft
- bigrid
- voltage
- photogate
- bigrid photo
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
-
- 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
Abstract
Display driving and fingerprint image acquisition can be realized using single device, so that the production assembling process of display screen is simplified compared with prior art in the method for display driving and fingerprint image acquisition provided by the invention.
Description
Technical field
The present invention relates to display screen fingerprint recognition fields, realize that display is driven using single device more particularly, to a kind of
Dynamic and fingerprint image acquisition method.
Background technique
With popularizing for digital product especially smart phone and tablet computer, using touch screen as human-computer interaction circle of representative
Surface technology is widely applied.At present in the unlocking manner of intelligent terminal, the combination pin of " number+letter ", screen sliding unlock
It is unlocked with pattern the most commonly used.In recent years, smart phone increases a special function --- and fingerprint recognition unlock such as rubs for 2011
Toro draws the Atrix4G of company's publication, increases new opplication to fingerprint recognition field.To in October, 2013, Apple Inc. is released
IPhone5S with fingerprint identification function, receives the favor in market, so that the application of man-machine interface interaction technique enters
One new milestone.
Common fingerprint collecting sensor has photo-electric, condenser type, RF type and heat-conducted etc. in the market.Wherein photo-electric
The principle that fingerprint collecting sensor acquires fingerprint is as follows: when finger touch display screen, backlight is penetrated liquid crystal by finger
Light to display screen surface is reflected back liquid crystal backboard, and photo-electric fingerprint collecting sensor adopts the light for being reflected back liquid crystal backboard
Collect and the image of acquisition is transported to fingerprint recognition system, fingerprint recognition system carries out fingerprint imaging identification again.Currently, to touching
What control screen use when driving and fingerprint image acquisition is all discrete device, produces assembling process complexity, higher cost, function
It consumes higher.
Summary of the invention
The present invention is to solve at least one defect of the above prior art, provides a kind of realization display driving and fingerprint image
As the method for acquisition, display driving and fingerprint image acquisition is can be realized using single device in this method, so that touch screen
Production assembling process be simplified compared with prior art.
To realize the above goal of the invention, the technical solution adopted is that:
A method of display driving and fingerprint image acquisition are realized using single device, are thin using bigrid photoelectricity
Film transistor carries out display driving and fingerprint image acquisition, the source electrode and capacitor C of bigrid photo tftLCOne end connect
It connects, capacitor CLCThe other end be referred to as common electrode, the bigrid photo tft includes that there are two operating modes, respectively
It is specific as follows respectively for display drive mode and fingerprint image acquisition mode:
(1) drive mode is shown
When touch, which starts switch, can't detect touch action, the work of bigrid photo tft drives mould in display
Formula comprising following steps:
A) write phase: making the dark grid of bigrid photo tft be set as positive voltage, if bigrid photoelectricity is thin
Film transistor Last status is in negative polarity driving condition, then applies positively biased to the drain electrode of bigrid photo tft
Pressure, and so that the photogate of bigrid photo tft, source electrode is charged to positive voltage by negative voltage, and apply to common electrode and bear
Voltage；It is brilliant to bigrid optoelectronic film if bigrid photo tft Last status is in positive polarity driving condition
The drain electrode of body pipe applies back bias voltage, and the photogate of bigrid photo tft, source electrode is made to be discharged to negative electricity by positive voltage
Pressure, and apply positive voltage to common electrode；
Show that signal is delivered to display unit, display letter by the drain electrode of bigrid photo tft, source electrode at this time
Number display unit is driven；
B) it keeps the stage: after completing write operation, applying back bias voltage to the dark grid of bigrid photo tft, and
Remain unchanged the voltage of photogate, source electrode, common electrode；
C) the modulation stage: keep stage certain time after enter the modulation stage, the modulation stage to common-battery pole tension into
Row increases or decreases, and prepares for the driving of display unit NextState, and make the dark grid of bigrid photo tft, leakage
The bias of pole remains unchanged；
(2) fingerprint image acquisition mode
When touch, which starts switch, detects touch action, touch is started switch in closure, bigrid optoelectronic film crystal
Pipe work in fingerprint image acquisition mode, this mode the following steps are included:
D) reseting stage: the dark grid of bigrid photo tft is set as negative voltage, photogate, source electrode, drain electrode
It is set as positive bias with common electrode, photogate is resetted；
E) it collection phase: completes after resetting, makes dark grid, drain electrode, photogate and the source of bigrid photo tft
Pole is set as back bias voltage, and bigrid photo tft completely closes, and common electrode is made to keep positive bias, reflects into from finger
The light come is absorbed by photogate, is excited the generation of photo-generated carrier and is stored in photogate；
F) it reads the stage: after completing collection phase, applying positively biased to the dark grid of bigrid photo tft, drain electrode
Pressure, and apply back bias voltage to common electrode, photogate, source electrode, enable the photo-generated carrier for being stored in photogate to pass through double grid
The source electrode of aurora thin film transistor exports.
As a preferred solution, described to touch the end Touch-initiated Switch started switch and bigrid
The photogate of photo tft connects, and touch, which is started switch through the end Touch-initiated Switch, controls application
To the voltage of photogate.
Compared with prior art, the beneficial effects of the present invention are:
(1) driving to display unit can be realized using single device, and fingerprint image acquisition may be implemented, give birth to
Simple at assembling process, complexity is reduced；
(2) it is additionally arranged a common electrode, bigrid photo tft is exported by the way of common electrode voltage modulation
The voltage of display signal be adjusted, allow the voltage of the display signal of input bigrid photo tft appropriate
It reduces, exports to reduce and to form display signal to the power consumption of the driving IC of bigrid photo tft, and effectively increase
Aperture opening ratio and light transmittance are added；
3) the signal-to-noise ratio height of the fingerprint image acquired, high resolution.
Detailed description of the invention
Fig. 1 is the port schematic diagram of bigrid photo tft.
Fig. 2 is the principle procedure chart of common electrode voltage modulation.
Fig. 3 be in the case where showing drive mode photogate, dark grid, source electrode, drain electrode and common electrode driver' s timing figure.
Fig. 4 be under fingerprint image acquisition mode photogate, dark grid, source electrode, drain electrode and common electrode acquisition timing diagram.
Specific embodiment
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；
Below in conjunction with drawings and examples, the present invention is further elaborated.
Embodiment 1
Bigrid photo tft is a four-terminal device, as shown in Figure 1, it is by photogate (Photo Gate-
PG), dark grid (Dark Gate-DG), source electrode (S) and drain electrode (D) composition.Bigrid photo tft can be regarded as
Two are placed in parallel back-to-back TFT, top TFT are formed by photogate and source electrode, drain electrode, by dark grid and source electrode, drain electrode group
At bottom TFT.In the present invention, the photogate of bigrid photo tft, dark grid, source electrode, drain electrode are represented sequentially as again
Bit line (Reset), selection line (Select), offset line (Bias) and data line (Data).
In method provided by the invention, there are two types of operating modes for bigrid photo tft tool, respectively show drive
Dynamic model formula and fingerprint image acquisition mode, concrete scheme are as follows:
One, drive mode is shown
When touch, which starts switch, can't detect touch action, bigrid photo tft is in display driving mould
Formula, data line (Data) switch to the end " Display ", switch of the bottom TFT as display signal, between reset line and data line
Capacitor can be used as storage capacitance improve bigrid photo tft capacity fall off situation.
Because of the direct current blocking effect of alignment film, removable ion and direct current residual effect and avoid LCD flashing phenomenon
Reason, so the display signal of " polarity reversion " must must be used when driving in the prior art to display unit to drive
It is dynamic.In the present embodiment, in order to reduce the power consumption for the driving IC to form display signal output, specially make bigrid optoelectronic film crystal
The source electrode and capacitor C of pipeLCOne end connection, capacitor CLCThe other end be referred to as common electrode, add common electrode, pass through common electrode
The mode of voltage modulation is adjusted the voltage for the display signal that bigrid photo tft exports, so that input double grid
The voltage of the display signal of aurora thin film transistor can be reduced suitably, be exported to reduce and to form display signal to double grid
The power consumption of the driving IC of aurora thin film transistor.
The principle of common electrode voltage modulation is respectively write as shown in Fig. 2, common electrode voltage modulation includes three working stages
Enter stage, holding stage and common electrode modulation stage.For example, as Fig. 2 1., 2., 3. shown in, bigrid photo tft
In write phase, bottom TFT is connected, and drain electrode input 4V voltage, source electrode exports 4V voltage, and common electrode inputs 0V voltage；And
When the holding stage, the bottom TFT of bigrid photo tft is disconnected, and drain electrode at this time keeps bias input, and source electrode keeps 4V
Voltage, common electrode input 0V voltage；And at the common electrode modulation stage, the bottom TFT of bigrid photo tft is disconnected,
Common electrode inputs 5V voltage, and source electrode be to keep and the original pressure difference of common electrode at this time, voltage will modulation to 9V.For another example,
As Fig. 2 4., 5., 6. shown in, bigrid photo tft in write phase bottom TFT be connected, drain electrode input 1V, source
Pole exports 1V voltage, and common electrode inputs 5V voltage；And at the stage of holding, the bottom TFT of bigrid photo tft
It disconnects, drain electrode at this time keeps bias input, and source electrode keeps 1V voltage, and common electrode inputs 5V voltage；And in the common electrode modulation stage
When, the bottom TFT of bigrid photo tft is disconnected, and common electrode inputs 0V voltage, and source electrode is holding and common electrode at this time
Original pressure difference, voltage will modulation extremely -4V.
Drive mode is shown within a particular process, including three phases, as shown in figure 3, respectively write phase, holding
Stage and modulation stage, the particular content in each stage are as described below:
A) write phase Twrite
It is driven when bigrid photo tft Last status is in negative polarity, then bigrid photo tft
Into TchargeState, selection line (Select) setting positive voltage make bottom TFT be in open current status, data line (Data)
Apply positive bias, reset terminal (Reset) and offset line (Bias) and positive voltage is charged to by negative voltage, common electrode (Com) applies negative
Voltage.
It is driven when bigrid photo tft Last status is in positive polarity, then bigrid photo tft
Into TdischargePositive voltage is still arranged in state, the selection line (Select) of the TFT of bottom, and data line (Data) applies negative
Bias, reset terminal (Reset) and offset line (Bias) are discharged to negative voltage by positive voltage, and common electrode (Com) applies positive voltage；
B) stage T is keptHold
When bigrid photo tft is in TchargeState or TdischargeState, write operation TwriteAfter the completion,
Into THoldIn the stage, selection line (Select) applies back bias voltage, reset terminal (Reset), offset line (Bias), common electrode at this time
(Com) voltage remains unchanged, with TwriteState consistency when completion.Storage capacitance between photogate and dark grid can slow down double grid
The drain conditions of aurora thin film transistor capacitor.
C) modulation stage TModulate
When bigrid photo tft is in TchargeState, write operation TwriteStage keeps THoldStage completes
Afterwards, into modulation TModulateIn the stage, improving common electrode (Com) voltage is that next stage driving is prepared, selection line (Select)
Back bias voltage is kept, data line (Data) and offset line (Bias) keep positive bias.
When bigrid photo tft is in TdischargeState, write operation TwriteStage keeps THoldStage is complete
Cheng Hou, into modulation TModulateIn the stage, reducing common electrode (Com) voltage is that next stage driving is prepared, selection line
(Select) back bias voltage is kept, data line (Data) and offset line (Bias) keep back bias voltage.
Two, fingerprint image acquisition mode
When touch, which starts switch, detects touch action, touch starts switch closure, bigrid photo tft
Fingerprint image acquisition mode is worked in, data line (Data) switches to the end " Imaging ", and bottom TFT is pushed up still as switch
The effect of portion TFT is that photoelectron is collected and stored.As shown in figure 4, the mode operation is divided into three phases:
D) reseting stage TReset: selection line (Select) is arranged makes bottom TFT be in powered-down stream mode in negative voltage, resets
Line (Reset) and offset line (Bias), data line (Data), common electrode (Com) apply positive bias, reset to photogate,
It prepares to collect light activated free electron.
E) collection phase TIntegration: after and then resetting operation, selection line (Select), resets data line (Data)
Line (Reset), offset line (Bias) is set as back bias voltage completely closes bigrid photo tft.Common electrode (Com)
Positive bias is kept, the light come is reflected into from finger and is absorbed through photogate by top TFT, electron hole pair, of short duration preservation are generated
In the TFT of top.
F) stage T is readRead: after completing photoelectronic collection, selection line (Select) applies positive bias, bottom TFT
Quickly opening allows electric current to flow into charge amplifier.At the same time, data line (Data) applies positive bias, and common electrode (Com) is answered
Bit line (Reset) and offset line (Bias), which apply back bias voltage, makes photo-generated carrier be transferred to bottom TFT for conducting.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention
Protection scope within.
Claims (2)
1. a kind of method for realizing display driving and fingerprint image acquisition using single device, is using bigrid optoelectronic film
Transistor carries out display driving and fingerprint image acquisition, it is characterised in that: the source electrode and capacitor of bigrid photo tft
CLCOne end connection, capacitor CLCThe other end be referred to as common electrode, the bigrid photo tft includes that there are two works
Operation mode respectively shows drive mode and fingerprint image acquisition mode, specific as follows respectively:
(1) drive mode is shown
When touch, which starts switch, can't detect touch action, the work of bigrid photo tft is showing drive mode,
Itself the following steps are included:
A) write phase: making the dark grid of bigrid photo tft be set as positive voltage, if bigrid optoelectronic film is brilliant
Body pipe Last status is in negative polarity driving condition, then applies positive bias to the drain electrode of bigrid photo tft, and
So that the photogate of bigrid photo tft, source electrode is charged to positive voltage by negative voltage, and applies negative voltage to common electrode；
If bigrid photo tft Last status is in positive polarity driving condition, to bigrid photo tft
Drain electrode applies back bias voltage, and the photogate of bigrid photo tft, source electrode is made to be discharged to negative voltage by positive voltage, and to
Common electrode applies positive voltage；
It shows that signal is delivered to display unit by the drain electrode of bigrid photo tft, source electrode at this time, shows signal pair
Display unit is driven；
B) it keeps the stage: after completing write operation, applying back bias voltage to the dark grid of bigrid photo tft, and make light
Grid, source electrode, common electrode voltage remain unchanged；
C) the modulation stage: enter the modulation stage after keeping stage certain time, the modulation stage mentions common-battery pole tension
It is high or reduce, it prepares for the driving of display unit NextState, and make the dark grid of bigrid photo tft, drain electrode
Bias remains unchanged；
(2) fingerprint image acquisition mode
When touch, which starts switch, detects touch action, bigrid photo tft works in fingerprint image acquisition mould
Formula, this mode the following steps are included:
D) reseting stage: the dark grid of bigrid photo tft is set as negative voltage, photogate, source electrode, drain electrode and altogether
Electrode is set as positive bias, resets to photogate；
E) it collection phase: completes after resetting, sets dark grid, drain electrode, photogate and the source electrode of bigrid photo tft
It is set to back bias voltage, bigrid photo tft completely closes, and common electrode is made to keep positive bias, reflects into from finger
Light is absorbed by photogate, is excited the generation of photo-generated carrier and is stored in photogate；
F) it reads the stage: after completing collection phase, applying positive bias to the dark grid of bigrid photo tft, drain electrode,
And apply back bias voltage to common electrode, photogate, source electrode, enable the photo-generated carrier for being stored in photogate to pass through double grid aurora
The source electrode of thin film transistor exports.
2. the method according to claim 1 for realizing display driving and fingerprint image acquisition using single device, feature
It is: the photogate for touching the end Touch-initiated Switch and bigrid photo tft that start switch
Connection, touch, which is started switch through the end Touch-initiated Switch, controls the voltage for being applied to photogate, thus real
Fingerprint collecting now is activated using touch-control, power consumption is effectively reduced.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018023424A1 (en) * | 2016-08-02 | 2018-02-08 | 广东顺德中山大学卡内基梅隆大学国际联合研究院 | Method for implementing display driving and fingerprint image acquisition using single device |
| CN110021254B (en) * | 2018-01-08 | 2022-03-08 | 佛山市顺德区中山大学研究院 | Method for driving double-grid photoelectric thin film transistor array by adopting single driving chip |
| CN108416252A (en) * | 2018-01-11 | 2018-08-17 | 佛山市顺德区中山大学研究院 | Optical finger print knows method for distinguishing under a kind of screen based on photoelectric sensor |
| CN108735782B (en) * | 2018-04-19 | 2021-10-19 | 佛山市顺德区中山大学研究院 | Vertical integrated structure of photoelectric sensor based on OLED |
| CN113892133B (en) * | 2019-05-31 | 2023-03-28 | 华为技术有限公司 | Pixel circuit and pixel control method |
| CN113138695B (en) * | 2021-04-20 | 2024-03-15 | 京东方科技集团股份有限公司 | Detection substrate, signal acquisition method thereof and display device |
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| CN104573648A (en) * | 2014-12-31 | 2015-04-29 | 广东顺德中山大学卡内基梅隆大学国际联合研究院 | Touch display screen drive and fingerprint image acquisition method |
| CN105137690A (en) * | 2008-12-03 | 2015-12-09 | 株式会社半导体能源研究所 | Liquid crystal display device |
| CN105184247A (en) * | 2015-08-28 | 2015-12-23 | 京东方科技集团股份有限公司 | Fingerprint identification member, identification method, display member and display device |
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| US8144115B2 (en) * | 2006-03-17 | 2012-03-27 | Konicek Jeffrey C | Flat panel display screen operable for touch position determination system and methods |
| TWI372277B (en) * | 2008-09-04 | 2012-09-11 | Au Optronics Corp | Display module |
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|---|---|---|---|---|
| CN105137690A (en) * | 2008-12-03 | 2015-12-09 | 株式会社半导体能源研究所 | Liquid crystal display device |
| CN104573648A (en) * | 2014-12-31 | 2015-04-29 | 广东顺德中山大学卡内基梅隆大学国际联合研究院 | Touch display screen drive and fingerprint image acquisition method |
| CN105184247A (en) * | 2015-08-28 | 2015-12-23 | 京东方科技集团股份有限公司 | Fingerprint identification member, identification method, display member and display device |
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