CN109992154A - Touch screen and fingerprint identification method with comprehensive screen fingerprint identification function - Google Patents
Touch screen and fingerprint identification method with comprehensive screen fingerprint identification function Download PDFInfo
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- CN109992154A CN109992154A CN201910193845.XA CN201910193845A CN109992154A CN 109992154 A CN109992154 A CN 109992154A CN 201910193845 A CN201910193845 A CN 201910193845A CN 109992154 A CN109992154 A CN 109992154A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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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
- G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
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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
- G06V40/1365—Matching; Classification
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04102—Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper
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- Theoretical Computer Science (AREA)
- General Engineering & Computer Science (AREA)
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Multimedia (AREA)
- Image Input (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
- Position Input By Displaying (AREA)
Abstract
The invention discloses a kind of touch screen and fingerprint identification method with comprehensive screen fingerprint identification function, which includes the screen cover board directly contacted with finger, the display screen below screen cover board and the flexible circuit board being electrically connected with display screen；The capacitive sensor array being integrated in display screen lamination is additionally provided in display screen, sensor as touch control detection and fingerprint detection, the capacitive sensor array includes the second induction electrode array of the first induction electrode array and setting in its vicinity, the first induction electrode array is also electrically connected with the display element in display screen lamination, for inputting display signal；The flexible circuit board includes TDDI chip, is connected respectively with the first induction electrode array and the second induction electrode array by I/O pin.Touch screen of the present invention is integrated with three kinds of display, touch-control and fingerprint recognition functions, it is not necessary that fingerprint recognition hardware module is separately provided after screen, saves mobile phone space, which also can apply to liquid crystal display.
Description
Technical field
The present invention relates to a kind of touch screen with fingerprint identification function more particularly to a kind of displays of collection, touch-control and fingerprint
Identification function is in the touch screen of one and the method for comprehensive screen fingerprint recognition.
Background technique
Fingerprint recognition unlocks the default scheme for having become most of smart phone, is most important biometric authentication side
Formula.For technical standpoint, fingerprint recognition has several solutions such as capacitance sensor, optical sensor and ultrasonic sensor at present
Scheme.And since iPhone 5S, capacitive fingerprint identifying schemes become mainstream, and the fingerprint recognition of current nearly all mobile phone is all
It is capacitance sensor scheme.Its working principle is that acquiring user's hand using the capacitance sensor being arranged at mobile phone Home key
Fingerprint road information, in addition heat-sensitive sensor auxiliary judgment, realizes fingerprint detection function.Capacitance sensor scheme is small in size, cost
Cheap and unlock rapidly, therefore becomes the preferred unlocking manner of intelligent machine.But, since starting to popularize " screen comprehensively " concept, electricity
Appearance scheme is gradually in a disadvantageous position.Because the concept shielded is that display area is allowed to maximize comprehensively, it is present that this means that needs remove
Home key and positive most hardware on smart phone, and what is disappeared therewith is usually placed in below these keys
Sensor, including capacitance sensor.Since user it is expected that fingerprint recognition can continue to be retained on comprehensive screen mobile phone, it is therefore necessary to
Fingerprint sensor is put into some other place by some way.
Although its performance of fingerprinting scheme based on capacitance sensor and cost advantage make us irresistible, but unfortunately
Be the factors such as limitation and touch accuracy of the capacitance type fingerprint identification technology because of power consumption, existing touch-control driving channel TX only has
Tens lines such as Fig. 3, density is not high, therefore cannot be used for detection fingerprint.In addition to capacitance type sensor, in addition shield lower fingerprint for two kinds
The concerned degree of sensor is gradually increased: one is ultrasonic sensors, and one is optical sensors, are all set in screen
Below.The penetrability of ultrasonic sensor, ultrasonic wave is preferable, penetrability and thickness strong correlation to object, so for preceding
The thickness for setting screen is very sensitive, screen have to it is enough thin, otherwise signal can not penetrate.It can be shown using relatively thin LED
Screen, such as ultra-thin AMOLED display screen (Active-matrix organic light-emitting diode, active matrix
Organic Light Emitting Diode or active-matrix Organic Light Emitting Diode) matched realization fingerprint recognition, and liquid crystal display (LCD)
Then due to innately thicker, it is not easy to reach quickly and accurately recognition effect.Another optical sensor needs fingerprint image to wear
Saturating screen passes to sensor, so being typically all to use relatively thin LED display such as AMOLED display screen, AMOLED display screen
Each pixel can be independently controlled, be not necessarily to constant backlight, the basis with light transmission, and liquid crystal display has backlight, back
Light part can not pass to the optical signal of screen front behind screen, therefore this optical sensor structure can not be suitable for liquid crystal
Display screen.Simultaneously because the penetrability of light is bad, it is easy to be influenced by light source and screen color, asking for identification mistake occur
Topic.Moreover, whether ultrasonic sensor or optical sensor, require to reserve the sky of setting sensor at screen rear
Between, in the case where handset structure develops towards lighter and thinner direction, there is compressed trend in this space, thus gives these
The placement of sensor brings new challenge.
Summary of the invention
Goal of the invention: in view of the above problems, the present invention propose a kind of touch screen with comprehensive screen fingerprint identification function with
And comprehensive screen fingerprint identification method based on the touch screen, this method can carry out fingerprint knowledge in any position in touching display screen
Not, LED class display screen can either be suitable for, and LCD display can be suitable for.
Technical solution: the technical scheme adopted by the invention is that a kind of touch screen with comprehensive screen fingerprint identification function,
The touch screen includes the screen cover board directly contacted with finger, the display screen below screen cover board and is electrically connected with display screen
Flexible circuit board；The capacitive sensor array being integrated in display screen lamination is additionally provided in display screen, as touch control detection and
The sensor of fingerprint detection, the capacitive sensor array include second of the first induction electrode array and setting in its vicinity
Induction electrode array, the first induction electrode array is also electrically connected with the display element in display screen lamination, aobvious for inputting
Show signal；The flexible circuit board includes the TDDI chip for handling display signal, touching signals and finger scan signal,
TDDI chip is connected with the first induction electrode array and the second induction electrode array respectively by its I/O pin.The display
High definition or full HD liquid crystal display can be used in screen.
Further, the first induction electrode array is the data line of several parallelly distribute ons, second sense
Answering electrod-array is several signal wires perpendicular with data line.The second induction electrode array is arranged in data line institute
In the top of plane, or it is arranged in the same plane of the data line.It is mutual when two kinds of electrodes are arranged in different layers
Appearance formula principle of induction forms capacitance sensor unit in the position of two kinds of electrode intersections, and one of electrode is another as driving
Kind is as induction electrode output detection signal.It is self-tolerant principle of induction, two kinds of electricity when two kinds of electrodes are arranged in identical layer
For pole capacitance variations over the ground as detection signal output, the corresponding display screen cost of such scheme is lower.
The smart phone made of the above-mentioned touch screen assembly for having and shielding fingerprint identification function comprehensively, does not need
Increase the relevant hardware of unlocked by fingerprint on Mobile telephone front panel.
The present invention also provides a kind of methods for carrying out fingerprint recognition using above-mentioned touch screen, pass through TDDI chip time-sharing multiplex
Capacitance type sensor realizes the integrated of display, touch-control and fingerprint identification function, comprising the following steps:
(1) display signal is sent to display element by TDDI chip controls the first induction electrode array, display screen is shown
Image.
(2) in the interval time that every frame image is shown, display element is turned off, the detection of TDDI chip is evenly distributed on entire
The capacitance variations of partition capacitance formula sensor on display screen, it is flat to calculate according to touch control detection signal caused by capacitance variations
The coordinate of touch point in face positions finger position；The partition capacitance formula sensor, quantity account for all capacitance type sensors
1/100 or less quantity.
(3) after navigating to the position of finger, the electricity of all capacitance type sensors near finger position is detected
Hold fingerprint detection signal caused by changing, and parsing comparison is carried out by TDDI chip, completes fingerprint recognition, shown in detection process
Show element OFF.The step is that the present frame after navigating to finger position carries out or at the interval that next frame image is shown
It is carried out in time.
The utility model has the advantages that compared with prior art, the invention has the following advantages that 1, using TDDI chip, be integrated with display,
Three kinds of functions of touch-control and fingerprint recognition do not need individual fingerprint Identification sensor hardware module after screen, save mobile phone space；
2, fingerprint identification function is integrated in screen, and fingerprint detection process not will receive the influence of backlight, it is made both to can be applied to LED
Display screen, such as AMOLED, and can be applied to LCD liquid crystal display screen, it is suitable for now all kinds of convention displays, versatility
By force；3, using the scheme identified afterwards is first positioned, multiplied sensor module saves sensor i.e. processor module, low in energy consumption, at
This is low；4, in conjunction with multi-point touch, it can be achieved that more fingerprints whiles identifies.
Detailed description of the invention
Fig. 1 is touch-control screen structure schematic diagram used in the present invention；
Fig. 2 is the time division multiplexing schematic diagram shown in the method for the invention with touch-control control；
Fig. 3 is data line (data line) the density schematic diagram controlled when touch-control of the present invention positioning；
Data line (data line) the density schematic diagram controlled when Fig. 4 is fingerprint recognition of the present invention；
Fig. 5 is the schematic illustration that mutual capacitance type capacitance sensor carries out fingerprint detection；
Fig. 6 is the structural schematic diagram of two kinds of electrodes of self-tolerant capacitance sensor.
Specific embodiment
Further description of the technical solution of the present invention with reference to the accompanying drawings and examples..
The touch screen with screen fingerprint identification function comprehensively of the present invention, structural schematic diagram is as shown in Figure 1, include
Display screen 2 below the screen cover board 1 that is directly contacted with finger, screen cover board and the flexible circuit board being connected with display screen 2
3。
Since the thickness of screen cover board 1 itself will lead to sensor collection less than enough signals, screen cover board 1 should
That does is thin as far as possible, reaches hundred micron orders, improves the sensitivity of capacitor touch-control display screen.
The capacitive sensor array being integrated in display screen lamination is equipped in display screen 2, both as the biography of touch control detection
Sensor, and the sensor as fingerprint detection.It is specifically integrated in TFT circuit layer, can be embedded in circuit layer, it can also be with
A part is embedded in TFT circuit layer, and another part is disposed there above.The capacitive sensor array includes several parallel
The data line 4 (data line) of distribution and the signal wire 5 of several perpendicular parallelly distribute ons.A kind of scheme is number
It is located in TFT circuit according to line 4 (data line), top (the display basic unit one of display basic unit is arranged in signal wire 5
As be sequentially arranged as filter glass, colour filter, TFT circuit, substrate glasses, colour cast piece and back lighting under upper), the two phase
It is mutually vertical.In this scheme, two kinds of electrode settings are mutual capacitance type principle of induction, at this time in data line 4 and signal wire in different layers
Capacitor is formed at the position of 5 intersections, data line 4 is as driving, and signal wire 5 is as induction electrode output detection signal.It is another
Scheme is, during data line 4 and signal wire 5 are located on the same floor, such as all in TFT circuit, the two is mutually perpendicular to, and is cross-woven
Together, as shown in fig. 6, being at this time self-tolerant principle of induction, the capacitance variations over the ground that data line 4 and signal wire 5 are formed are made
For detection signal output, the corresponding display screen cost of such scheme is lower.Data line 4 (data line) also with display screen lamination
In display element electrical connection, for input display signal.The compact structure of this precision makes data line 4 need repeatedly to be answered
With, the source electrode in display as display unit inputs, in touch control detection as touch-control emitter, the conduct in fingerprint detection
The electrode of capacitance sensor.Also, the structure will realize accurate finger scan, and data line 4 is needed to meet the density of 20/mm
It is required that.For the angle of resolution ratio, high definition (HD) or full HD (FHD screen) liquid crystal display can be used.This display screen
Upper to have data line 1000~2000, density is about 40/mm, can meet above-mentioned requirements.
The flexible circuit board 3 include TDDI chip, TDDI chip by its I/O pin respectively with data linear array and letter
Number array is connected.TDDI (Touch and Display Driver Integration) chip, i.e. touch-control and display driving collection
At chip, for handling display, touch-control and finger scan signal.Touch chip and display chip are integrated into list by this chip
In one chip, display noise is reduced, while keeping display screen whole thinner.TDDI chip controls data using the method for time-sharing multiplex
Line 4 carry out pixel show, touch control detection and fingerprint detection.As shown in Fig. 2, display segment (display) is used to show image, this
Data line 4 is shown for controlling screen pixels in the section time.Between two display segments (display) for some time between
Every using this section of interval time as Scanning Section (touch) is touched, data line 4 is used to carry out the touch-control of finger in this time
Then positioning and finger scan compare finger print information by TDDI chip, complete fingerprint recognition.Software corresponding to the above process
Program is responsible for execution by TDDI chip, and program is stored in the readable storage medium of chip.
In the present embodiment, the fingerprint identification method based on above-mentioned touch screen the following steps are included:
(1) data line (data line) in touching display screen is arranged in display area (active in TDDI chip controls
Area) in display element interval send for display source signal, display screen show image.Such as the display segment in Fig. 2
(display) shown in.TDDI chip controls screen pixels by data line (data line) and shows in this period.It counts at this time
According to the source electrode (source line) of line (data line) functioned as in common display screen, screen pixels are at the control
Show corresponding color.
(2) in the interval time that every frame image is shown, display element is turned off, the detection of TDDI chip is evenly distributed on entire
The capacitance variations of partition capacitance formula sensor on display screen, it is flat to calculate according to touch control detection signal caused by capacitance variations
The coordinate of touch point in face positions finger position.As shown in figure 3, the data line that TDDI chip controls when being positioned by touch-control
Density schematic diagram.Because capacitance sensor density required for positioning finger position is simultaneously little, at thousands of of display screen
In data line, every tens datas line just enough positions it using one.In mutual tolerance structure, this segment data line
(data line) drives touch control detection as touch-control emitter TX, and the position of capacitance sensor is formed on corresponding signal wire
Detection signal is exported as touch-control receiving pole RX.From in appearance structure, it is also necessary to detection and the comparable signal wire of data line quantity.
It is calculated according to a capacitance sensor unit composition sensor arrays millions of on display screen, above-mentioned partition capacitance formula sensor
Quantity account for 1/100 or less of whole capacitance type sensor quantity in screen.
(3) after navigating to the position of finger, the electricity of all capacitance type sensors near finger position is detected
Hold fingerprint detection signal caused by changing, and parsing comparison is carried out by TDDI chip, completes fingerprint recognition, shown in detection process
Show element OFF.The step is that the present frame after navigating to finger position carries out or at the interval that next frame image is shown
It is carried out in time.It carries out, then will not if it is in navigating to the interval time that the next frame image after finger position is shown
Display or finger positioning are interfered.When detection, all data lines and signal wire near finger position (laterally with
Longitudinally) the pole plate as fingerprint capacitor sensor.It detects fingerprint and needs highdensity data line, as shown in figure 4, needing to use finger
All data lines near line.Fingerprint nearby can choose using finger position as the border circular areas of center of circle diameter 1-4cm.
Finger is pressed at the surface of capacitance type touch control screen, and the Wave crest and wave trough of fingerprint can be on screen internal capacitance upper/lower electrode
Charge allocation proportion impacts, therefore the charge ratio at position corresponding to the peak and valley of fingerprint on upper/lower electrode is different, leads to
This difference is crossed to reappear to fingerprint.The principle that mutual capacitance type capacitance sensor carries out fingerprint detection is as shown in Figure 5.Data line 4
With signal wire 5 respectively as the upper and lower pole plate (upper electrode, lower electrode) of capacitance sensor unit,
Data line (data line) is when mutual capacitance type touch-control works as signal transmitting terminal (TX), and VCOM is subdivided into much in an lcd
Signal wire is then that ELVSS is subdivided into many blocks as signal wire in AMLED, and signal wire is also when mutual capacitance type touch-control works
Touch-control receiving end (RX).
The present invention is the data line (data line) for making full use of pixel source electrode (source), passes through time-sharing multiplex data
Line (data line) makes it serve as the source electrode (source) of display, touch-control emitter (TX), fingerprint respectively in different steps
The capacitor plate of detection sensor.When needing to detect fingerprint, finger touching first is carried out with uniform several hundred a capacitance sensors
Control detection positions the position of finger, then carries out fingerprint detection to whole capacitance sensors near finger position, mentions significantly
The packing density of high finger position, tens times or more of density are promoted to detect finger print data.The finger print data that will test
It is parsed by the fingerprint detection algorithm in TDDI chip, the similarity degree between fingerprint for calculating and registering, final
To the matching result of two fingerprints, full frame fingerprint recognition is realized.This scheme promotes density, opposite General Promotion density using fixed point
Power consumption also only has 1/tens.Present invention combination multi-point touch, identification while can also realizing more fingerprints.Due to its sensing
Principle is not influenced by the backlight of display screen, and LED and LCD screen can use, versatile.
The smart phone made of the above-mentioned touch screen assembly for having and shielding fingerprint identification function comprehensively, does not need
Increase the relevant hardware of unlocked by fingerprint on Mobile telephone front panel, needs less manufacture part.This means that more simplified manufacture stream
Journey and more light compact airframe structure, possess powerful competitiveness on existing mobile phone market.
Claims (9)
1. a kind of touch screen with comprehensive screen fingerprint identification function, it is characterised in that: the touch screen includes directly connecing with finger
Display screen (2) below the screen cover board (1) of touching, screen cover board (1) and the flexible circuit board being electrically connected with display screen (2)
(3)；Display screen is additionally provided with the capacitive sensor array being integrated in display screen lamination in (2), as touch control detection and fingerprint
The sensor of detection, the capacitive sensor array include the second induction of the first induction electrode array and setting in its vicinity
Electrod-array, the first induction electrode array are also electrically connected with the display element in display screen lamination, for inputting display letter
Number；The flexible circuit board (3) includes the TDDI chip for handling display signal, touching signals and finger scan signal,
TDDI chip is connected with the first induction electrode array and the second induction electrode array respectively by its I/O pin.
2. the touch screen with screen fingerprint identification function comprehensively according to claim 1, it is characterised in that: described first
Induction electrode array is the data line (4) of several parallelly distribute ons.
3. the touch screen with screen fingerprint identification function comprehensively according to claim 2, it is characterised in that: described second
Induction electrode array is several signal wires (5) perpendicular with data line (4).
4. the touch screen with screen fingerprint identification function comprehensively according to claim 1, it is characterised in that: described second
The setting of induction electrode array is in the top of plane where data line (4), or setting is in the same plane of the data line (4)
It is interior.
5. the touch screen with screen fingerprint identification function comprehensively according to claim 1, it is characterised in that: the display
Shield (2) and uses high definition or full HD liquid crystal display.
6. a kind of intelligence with screen fingerprint identification function comprehensively using the described in any item touch screen manufactures of Claims 1 to 5
It can mobile phone.
7. a kind of method for carrying out fingerprint recognition using the described in any item touch screens of claim 1-5, which is characterized in that pass through
TDDI chip time-sharing multiplex capacitance type sensor realizes the integrated of display, touch-control and fingerprint identification function, comprising the following steps:
(1) display signal, display screen (2) display figure are sent to display element by TDDI chip controls the first induction electrode array
Picture；
(2) in the interval time that every frame image is shown, display element is turned off, the detection of TDDI chip is evenly distributed on entire display
The capacitance variations of partition capacitance formula sensor on screen, touch control detection signal is according to caused by capacitance variations come in Calculation Plane
The coordinate of touch point positions finger position；
(3) after navigating to the position of finger, the capacitor for detecting all capacitance type sensors near finger position becomes
Fingerprint detection signal caused by changing, and parsing comparison is carried out by TDDI chip, fingerprint recognition is completed, shows member in detection process
Part shutdown.
8. fingerprint identification method according to claim 7, it is characterised in that: be evenly distributed on described in the step 2
The quantity of partition capacitance formula sensor on entire display screen accounts for the 1/100 or less of all capacitance type sensor quantity.
9. fingerprint identification method according to claim 7, it is characterised in that: the step 3 is to navigate to finger position
Later present frame is carried out or is carried out in the interval time that next frame image is shown.
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| CN111158054A (en) * | 2019-12-31 | 2020-05-15 | 浙江大学 | Passive object detection display system and method based on LED screen |
| CN112015296A (en) * | 2020-08-25 | 2020-12-01 | 深圳市爱协生科技有限公司 | Touch detection method of full-screen fingerprint panel |
| CN112416158A (en) * | 2019-08-21 | 2021-02-26 | 联咏科技股份有限公司 | Control circuit and method for controlling display screen by using same |
| CN114093329A (en) * | 2020-07-31 | 2022-02-25 | 京东方科技集团股份有限公司 | Display panel driving method, driving device and display device |
| CN114356128A (en) * | 2020-09-27 | 2022-04-15 | 北京小米移动软件有限公司 | Drive control system and method and electronic equipment |
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