CN112015296B - Touch detection method of full-screen fingerprint panel - Google Patents
Touch detection method of full-screen fingerprint panel Download PDFInfo
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- CN112015296B CN112015296B CN202010863643.4A CN202010863643A CN112015296B CN 112015296 B CN112015296 B CN 112015296B CN 202010863643 A CN202010863643 A CN 202010863643A CN 112015296 B CN112015296 B CN 112015296B
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- 238000001514 detection method Methods 0.000 title claims abstract description 67
- 239000002131 composite material Substances 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims description 10
- 150000001875 compounds Chemical class 0.000 claims description 8
- 230000003287 optical effect Effects 0.000 claims description 8
- 229920001621 AMOLED Polymers 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000010354 integration Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
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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
- G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
-
- 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
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic 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
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
-
- 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
- G06F2203/04104—Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Multimedia (AREA)
- Image Input (AREA)
- Position Input By Displaying (AREA)
Abstract
The invention discloses a touch detection method of a comprehensive screen fingerprint panel, which comprises a panel and a composite integrated chip fixed on the panel, wherein the composite integrated chip comprises a touch sensing circuit, a fingerprint detection circuit and a display driving circuit, the panel comprises a touch sensing unit and a fingerprint detection unit, the touch sensing unit is formed by splicing a plurality of triangular touch sensing electrodes, and the touch sensing unit and the display driving circuit work in a time-sharing way; if the touch sensing circuit senses a touch point, the composite integrated chip calculates touch coordinates and reports the touch coordinates; otherwise, starting a fingerprint detection circuit, fingerprint scanning the touch point by the fingerprint detection circuit, determining the touch point by the composite integrated chip according to the touch detection result and the fingerprint scanning result, calculating touch coordinates according to the shape of the touch sensing electrode and the touch point, and reporting. The invention greatly reduces the scale and complexity of the touch detection circuit, and reduces the design cost and the production cost.
Description
Technical Field
The invention relates to the technical field of full-screen, in particular to a touch detection method of a full-screen fingerprint panel.
Background
Currently, TDDI (Touch AND DISPLAY DRIVER Integration Touch and display driver Integration) technology is well established, which results in a chip design complexity and area that is much larger than that of a pure LCD driver chip due to the large number of sense electrodes. For example, fig. 1 is a conventional TDDI scheme, which is composed of a panel and a corresponding TDDI chip, wherein VCOM (common electrode of LCD display) of the panel is divided into small squares of m×n, and multiplexed into a sensing unit for touch detection. Assuming that the pitch size of the square electrode is P (cm), and the length and width of the screen are X (cm) and Y (cm), respectively, the number of electrodes num=m×n= (x×y)/(p×p). Typically num values can reach above 400, resulting in a very large area of touch detection circuitry. In this case, the fingerprint detection function is added to the TDDI chip, so that not only is the design difficulty very large, but also the chip area is large, and the cost and the structural design are affected.
Disclosure of Invention
The invention provides a touch detection method of a full-screen fingerprint panel, which solves the problems that in the prior art, a fingerprint detection function is added to a TDDI chip, so that the design difficulty is very high, the chip area is also very large, and the cost and the structural design are influenced.
The technical scheme of the invention is realized as follows:
The utility model provides a touch detection method of comprehensive screen fingerprint panel, comprehensive screen fingerprint panel includes panel and compound integrated chip, compound integrated chip contains touch-sensitive circuit, fingerprint detection circuit and display drive circuit, compound integrated chip is fixed on the panel, the panel contains touch-sensitive unit and fingerprint detection unit, touch-sensitive unit is formed by the concatenation of a plurality of triangle-shaped touch-sensitive electrodes, fingerprint detection unit adopts the optical detection method, compound integrated chip respectively with touch-sensitive unit and fingerprint detection unit electric connection specifically includes the following steps:
after the composite integrated chip is electrified, the touch sensing circuit and the fingerprint detection circuit work in a time-sharing way; if the touch sensing circuit senses a touch point, the composite integrated chip calculates touch coordinates and reports the touch coordinates; and if the touch sensing circuit senses two or more touch points, starting a fingerprint detection circuit, performing fingerprint scanning on the touch points by the fingerprint detection circuit, determining the touch points by the composite integrated chip according to the touch detection result and the fingerprint scanning result, calculating touch coordinates according to the shape of the touch sensing electrode and the touch points, and reporting the touch coordinates.
Preferably, the triangular touch sensing electrodes are distributed transversely or longitudinally.
Preferably, the fingerprint detection circuit is an optical fingerprint detection circuit.
Preferably, the composite integrated chip is an FTDI chip with fingerprint, touch and display integrated together.
Preferably, the touch sensing circuit and the fingerprint scanning circuit adopt time-division multiplexing analog-to-digital converters.
Preferably, the composite integrated chip is formed by combining TDDI chips and a fingerprint scanning chip.
Preferably, the panel is a TFT LCD, AMOLED, mini LED or Micro OLED.
The invention has the beneficial effects that: the scale and the complexity of the touch detection circuit are greatly reduced, so that the design cost and the production cost are reduced.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of a conventional TDDI scheme;
FIG. 2 is a schematic diagram of a full-screen fingerprint panel segmentation of a touch detection method of a full-screen fingerprint panel according to the present invention;
FIG. 3 is a flow chart of touch detection;
Fig. 4 is a schematic diagram of coordinate calculation.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the azimuth or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
With the maturity of TDDI technology, the TFT-LCD glass has now been fully turned to an embedded scheme. At the same time, individual fingerprint sensors have also become very sophisticated. In order to improve the competitiveness of products and simplify the structural design of terminals such as mobile phones, the industry is struggling to integrate three of display, touch and fingerprint into one chip. In order to solve the integration difficulty of three-in-one, realize FTDI (fingerprint touch display integration), reduce the chip area at the same time, the invention has proposed a new scheme. That is, the number of sensing electrodes for touch detection is reduced by simplifying the pattern (pattern) of the touch sensing unit, specifically, the touch sensing electrodes having a triangular pattern as shown in fig. 2.
The sensing electrode pattern shown in FIG. 2, if the electrode height is A (in cm, including pitch), the number of electrodes is 2*Y/A, and the number is greatly reduced, and can be controlled to be generally within 50. Only a single touch can be detected. If the touch point is greater than one, there is a ghost point (false point) as shown in fig. 2, so that the system cannot determine the true touch point. In order to solve the problem of ghost points in the simplified touch electrode pattern, the method combines the results of touch detection and fingerprint detection, and finally eliminates the ghost points caused by the pattern touch to obtain real touch points.
As shown in fig. 3, the invention provides a touch detection method of a full-screen fingerprint panel, the full-screen fingerprint panel comprises a panel and a composite integrated chip, the composite integrated chip comprises a touch sensing circuit, a fingerprint detection circuit and a display driving circuit, the composite integrated chip is fixed on the panel, the panel comprises a touch sensing unit and a fingerprint detection unit, the touch sensing unit is formed by splicing a plurality of triangular touch sensing electrodes, the fingerprint detection unit adopts an optical detection method, and specifically, the fingerprint detection unit consists of a photodiode and a thin film transistor on the panel, and the composite integrated chip is respectively and electrically connected with the touch sensing unit and the fingerprint detection unit, and specifically comprises the following steps:
after the composite integrated chip is electrified, the touch sensing circuit and the fingerprint detection circuit work in a time-sharing way; if the touch sensing circuit senses a touch point, the composite integrated chip calculates touch coordinates and reports the touch coordinates; and if the touch sensing circuit senses two or more touch points, starting a fingerprint detection circuit, performing fingerprint scanning on the touch points by the fingerprint detection circuit, determining the touch points by the composite integrated chip according to the touch detection result and the fingerprint scanning result, calculating touch coordinates according to the shape of the touch sensing electrode and the touch points, and reporting the touch coordinates.
As shown in fig. 4, it is assumed that the length of the triangular touch sensing electrode is D1 and the height is D2. If the touch at the touch point A only occurs at the 2*N-3 th electrode and the 2*N-2 nd electrode, the distance between the electrodes is D3, the touch variation of the sensing electrode 2*N-3 is differ1, and the touch variation of the sensing electrode 2*N-2 is differ2; the coordinates (x, y) of point a are:
If touch point A is at 2*N-4 and 2*N-3 electrodes, reference is made to the above calculations. But the Y-coordinate is calculated to compensate for the triangular electrodes. If the touch point A spans multiple electrodes, the multiple electrodes can be divided into multiple groups of two adjacent electrodes, multiple groups of coordinates are calculated according to the method, and finally the final coordinates can be obtained by taking the average value of the multiple groups of coordinates.
The triangular touch sensing electrodes are distributed on or in the panel in a transverse or longitudinal direction.
The fingerprint detection circuit is an optical fingerprint detection circuit. The invention adopts an optical fingerprint detection method, the fingerprint detection device in the glass is a photosensitive diode, and the detection circuit does not work all the time due to power consumption, but starts optical fingerprint detection by judging whether there is touch or other methods. The touch detection adopts a capacitance detection method, and the touch sensing electrode adopts a triangle pattern; the FTDI chip combines the fingerprint, touch and display drive functions.
The composite integrated chip is an FTDI chip with fingerprint, touch and display integrated together. The touch sensing circuit and the fingerprint scanning circuit adopt a time-division multiplexing analog-to-digital converter (ADC). The composite integrated chip is formed by combining TDDI chips and a fingerprint scanning chip.
The panel is a TFT LCD, an AMOLED, a mini LED or a Micro OLED. The invention can also be used for detecting TFT LCD, AMOLED, mini LED and Micro OLED.
The invention has the beneficial effects that: the scale and the complexity of the touch detection circuit are greatly reduced, so that the design cost and the production cost are reduced.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (7)
1. The utility model provides a touch detection method of comprehensive screen fingerprint panel, its characterized in that, comprehensive screen fingerprint panel includes panel and compound integrated chip, compound integrated chip contains touch-sensitive circuit, fingerprint detection circuit and display driver circuit, compound integrated chip is fixed on the panel, the panel contains touch-sensitive unit and fingerprint detection unit, touch-sensitive unit is formed by the concatenation of a plurality of triangle-shaped touch-sensitive electrodes, fingerprint detection unit adopts the optical detection method, compound integrated chip respectively with touch-sensitive unit and fingerprint detection unit electric connection specifically includes the following steps:
After the composite integrated chip is electrified, the touch sensing circuit and the fingerprint detection circuit work in a time-sharing way; if the touch sensing circuit senses a touch point, the composite integrated chip calculates touch coordinates and reports the touch coordinates; if the touch sensing circuit senses two or more touch points, starting a fingerprint detection circuit, performing fingerprint scanning on the touch points by the fingerprint detection circuit, determining the touch points by the composite integrated chip according to the touch detection result and the fingerprint scanning result, calculating touch coordinates according to the shape of the touch sensing electrode and the touch points, and reporting the touch coordinates;
Assuming that the length of the triangular touch sensing electrode is D1, the height is D2, if the touch at the touch point A only occurs at 2*N-3 and 2*N-2 electrodes, the distance between the electrodes is D3, the touch variation of the sensing electrode 2*N-3 is differ1, and the touch variation of 2*N-2 is differ; the coordinates (x, y) of point a are:
If the touch point A is at 2*N-4 and 2*N-3 electrodes, referring to the calculation mode, the calculation of the Y coordinates is compensated according to the triangular electrodes, if the touch point A spans a plurality of electrodes, the plurality of electrodes are divided into a plurality of groups of two adjacent electrodes, the plurality of groups of coordinates are calculated according to the method, and finally, the average value of the plurality of groups of coordinates is taken to obtain the final coordinates.
2. The method for touch detection of a full-screen fingerprint panel according to claim 1, wherein the triangular touch sensing electrodes are distributed laterally or longitudinally.
3. The method of claim 1, wherein the fingerprint detection circuit is an optical fingerprint detection circuit.
4. The method for detecting the touch of the full-screen fingerprint panel according to claim 1, wherein the composite integrated chip is an FTDI chip with fingerprint, touch and display integrated together.
5. The method of claim 1, wherein the touch sensing circuit and the fingerprint scanning circuit employ time-division multiplexed analog-to-digital converters.
6. The method for touch detection of a full-screen fingerprint panel according to claim 1, wherein the composite integrated chip is composed of TDDI chips and fingerprint scanning chips.
7. The method of claim 1, wherein the panel is a TFT LCD, AMOLED, mini LED, or Micro OLED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010863643.4A CN112015296B (en) | 2020-08-25 | 2020-08-25 | Touch detection method of full-screen fingerprint panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010863643.4A CN112015296B (en) | 2020-08-25 | 2020-08-25 | Touch detection method of full-screen fingerprint panel |
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| CN112015296A CN112015296A (en) | 2020-12-01 |
| CN112015296B true CN112015296B (en) | 2024-04-26 |
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| CN202010863643.4A Active CN112015296B (en) | 2020-08-25 | 2020-08-25 | Touch detection method of full-screen fingerprint panel |
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| CN115617191A (en) * | 2022-06-08 | 2023-01-17 | 荣耀终端有限公司 | Touch anomaly suppression method, electronic device and storage medium |
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| CN203773528U (en) * | 2014-03-21 | 2014-08-13 | 信利光电股份有限公司 | Liquid crystal display device and single-layer touch screen thereof |
| CN106201126A (en) * | 2015-01-13 | 2016-12-07 | 小米科技有限责任公司 | Touch screen and fingerprint recognition realize device and terminal unit |
| CN106709455A (en) * | 2016-12-23 | 2017-05-24 | 张帆 | Display screen for supporting full screen optical fingerprint sensor and manufacturing method thereof |
| CN107665068A (en) * | 2017-09-20 | 2018-02-06 | 成都睿联创想科技有限责任公司 | A kind of ultrasonic touch screen system |
| CN109992154A (en) * | 2019-03-14 | 2019-07-09 | 南京观海微电子有限公司 | Touch screen and fingerprint identification method with comprehensive screen fingerprint identification function |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109583320A (en) * | 2018-11-08 | 2019-04-05 | Oppo广东移动通信有限公司 | Fingerprint identification method and relevant apparatus |
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- 2020-08-25 CN CN202010863643.4A patent/CN112015296B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203773528U (en) * | 2014-03-21 | 2014-08-13 | 信利光电股份有限公司 | Liquid crystal display device and single-layer touch screen thereof |
| CN106201126A (en) * | 2015-01-13 | 2016-12-07 | 小米科技有限责任公司 | Touch screen and fingerprint recognition realize device and terminal unit |
| CN106709455A (en) * | 2016-12-23 | 2017-05-24 | 张帆 | Display screen for supporting full screen optical fingerprint sensor and manufacturing method thereof |
| CN107665068A (en) * | 2017-09-20 | 2018-02-06 | 成都睿联创想科技有限责任公司 | A kind of ultrasonic touch screen system |
| CN109992154A (en) * | 2019-03-14 | 2019-07-09 | 南京观海微电子有限公司 | Touch screen and fingerprint identification method with comprehensive screen fingerprint identification function |
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Address after: Area D and E, 7th floor, building 3, Tingwei Industrial Park, No.6 Liufang Road, Xin'an street, Shenzhen City, Guangdong Province 518000 Applicant after: Shenzhen Aixiesheng Technology Co.,Ltd. Address before: Area D and E, 7th floor, building 3, Tingwei Industrial Park, No.6 Liufang Road, Xin'an street, Shenzhen City, Guangdong Province 518000 Applicant before: SHENZHEN AIXIESHENG TECHNOLOGY Co.,Ltd. |
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