CN106843587B - Touch control method - Google Patents
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- CN106843587B CN106843587B CN201710058727.9A CN201710058727A CN106843587B CN 106843587 B CN106843587 B CN 106843587B CN 201710058727 A CN201710058727 A CN 201710058727A CN 106843587 B CN106843587 B CN 106843587B
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- 230000003287 optical effect Effects 0.000 abstract description 21
- 238000010586 diagram Methods 0.000 description 9
- 230000003247 decreasing effect Effects 0.000 description 1
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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
- 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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Abstract
A touch method is suitable for a light sensing device. The optical sensing device has a sensing region with N gate lines and M sensing lines. The touch method comprises the steps of sensing and capturing image characteristics of a touch object in a first local sensing area of a sensing area. After sensing and capturing the image characteristics of the touch object, judging whether the touch object is positioned on the sensing area. And when the touch object is judged to be positioned on the sensing area, calculating the coordinate information of the first characteristic position of the touch object. And updating the position of the first local sensing block according to the coordinate information so as to generate a second local sensing block of the sensing area. And sensing and capturing image features in the second local sensing area.
Description
Technical Field
The present invention relates to a touch method, and more particularly, to a touch method for a light sensing device.
Background
Because the specification requirement of a fingerprint sensor (FPR) at a Fingerprint Acquisition Profile (FAP) number is greater, compared with a conventional architecture, the fingerprint sensor in the TFT optical technology has the advantage of being light and thin, and can be used for designing high-end security information products no matter in combination with the attachment of backlight or front light materials. Not only can be used for identifying personal identity, but also can be suitable for the use of Touch pad (Touch pad) in size. However, to perfectly integrate multiple functions into TFT optical technology, problems due to characteristics still need to be overcome.
The optical sensor is characterized by a small bright current and a small sensitivity to light, so the backend system needs a long time to sense. The large size of the fingerprint sensor cannot operate at a high frame rate (frame rate), so the optical fingerprint sensor must sacrifice resolution to increase sensing speed. The current practice usually employs down-scaling for the gate lines and the sensing lines, which has the disadvantages of less touch pressure information for the touch object, easily causing inaccuracy of calculating the center of gravity, and poor linearity of sliding touch. Another disadvantage is that the touch information is too similar to the non-touch information, and therefore additional pressure sensing devices are required to determine whether there is a touch.
Disclosure of Invention
The present invention provides a touch method, which can select a local block in a sensing region of a photo sensing device and dynamically adjust the local block to improve the sensing speed of touch and maintain the sensing quality with high resolution.
According to an embodiment of the present invention, the touch method is suitable for an optical sensing device having a sensing region including N gate lines and M sensing lines, where N and M are positive integers. The touch method is contained in a first local sensing area block of the sensing area, and senses and captures the image characteristics of a touch object. After sensing and capturing the image characteristics of the touch object, judging whether the touch object is positioned on the sensing area. And when the touch object is judged to be positioned on the sensing area, calculating the coordinate information of the first characteristic position of the touch object. And updating the position of the first local sensing block according to the coordinate information so as to generate a second local sensing block of the sensing area. And in the second local sensing area, sensing and capturing image characteristics.
The touch method disclosed by the invention achieves dynamic adjustment of the selected local block by selecting the local block in the sensing area on the light sensing device and by the time sequence control of the grid line and the sensing line, thereby improving the sensing speed of touch and maintaining the sensing quality of high resolution.
The foregoing description of the disclosure and the following detailed description are presented to illustrate and explain the principles and spirit of the invention and to provide further explanation of the invention as claimed.
Drawings
Fig. 1 is a schematic diagram of a photo sensing device according to an embodiment of the invention.
Fig. 2 is a flowchart illustrating a touch method according to an embodiment of the invention.
Fig. 3 is a flowchart illustrating a method of touch control according to another embodiment of the invention.
Fig. 4 is a timing control diagram according to an embodiment of the invention.
Fig. 5 is a schematic diagram of a photo sensing device according to another embodiment of the invention.
Fig. 6a is a schematic diagram of a photo sensing device according to another embodiment of the invention.
FIG. 6b is a timing control diagram according to another embodiment of the present invention.
Fig. 7 is a schematic diagram of a photo sensing device according to another embodiment of the invention.
Description of reference numerals:
10: light sensing device
12: gate driving unit
14: sensing unit
16: multiplexer
18: time sequence controller
20: analog-to-digital converter
And SA: sensing region
PA _ 1: a first local sensing block
PA _ 2: second local sensing block
PA _ 3: third local sensing block
PA _ 4: the fourth local sensing block
P _ int: first initial feature position
P1: first characteristic position
P2: second position
P3: third position
(x, y), (xi, yi): coordinate information
FR 1: first picture frame
FR 2: second picture frame
CLK: clock signal
GT: drive signal
Ctrl: control signal
Data _ out: digital data signal
f1, f 2: frequency of
T1-T4: sensing period
D1-D512: data line
DA 1-DA 512: digital data
k. m, n is the number of the gate line
p, m sense line numbering
Detailed Description
The detailed features and advantages of the present invention are described in detail in the following embodiments, which are sufficient for anyone skilled in the art to understand the technical contents of the present invention and to implement the present invention, and the related objects and advantages of the present invention can be easily understood by anyone skilled in the art according to the disclosure of the present specification, the claims and the attached drawings. The following examples further illustrate aspects of the invention in detail, but are not intended to limit the scope of the invention in any way.
Referring to fig. 1 and fig. 2 together, fig. 1 is a schematic view illustrating a photo sensing device according to an embodiment of the invention. Fig. 2 is a flowchart illustrating a method of a touch method according to an embodiment of the invention, where the touch method of fig. 2 is applied to the photo sensing device of fig. 1. As shown in fig. 1, the photo sensing device 10 has a sensing region SA, and the sensing region SA includes N gate lines and M sensing lines. In step S202, in the first local sensing block PA _1 of the sensing area SA of the optical sensing device 10, the image feature of the touch object OBJ is sensed and captured. In one embodiment, the touch object OBJ is a finger of the user, and the image feature is a fingerprint of the finger. When a user touches the sensing area SA with a finger, the optical sensing device 10 senses and reads a fingerprint of the finger in a partial area of the sensing area SA (e.g. the first partial sensing area PA _1 in fig. 1). In other embodiments, the touch object OBJ is another part of the user or another object, and the invention is not limited to the above embodiments. In step S204, after sensing and capturing the image feature of the touch object OBJ, it is determined whether the touch object OBJ is located on the sensing area SA. That is, in one example, after the finger touches the sensing area SA of the photo sensing device 10, the finger of the user may immediately leave the sensing area SA to end the touch operation, or may stay in the sensing area SA for further touch operation.
In the next step S206, when the touch object OBJ is determined to be located on the sensing area SA, the coordinate information of the first characteristic position P1 of the touch object OBJ is calculated. As shown in fig. 1, the light sensing device 10 may calculate coordinate information (x, y) of a first characteristic position P1 of the touch object OBJ. In one embodiment, the first characteristic position P1 is the same as the position of the touch object OBJ at the initial touch, i.e. the touch object OBJ does not move after the initial touch. In another embodiment, the first characteristic position P1 is different from the initial touch position of the touch object OBJ, that is, the touch position of the touch object OBJ has changed. In the next step S208, the position of the first local sensing block PA _1 is updated according to the coordinate information of the first characteristic position P1, so as to generate a second local sensing block PA _2 of the sensing region. That is, in the embodiment of fig. 2, the touch position of the touch object OBJ is initially located within the first local sensing area PA _1 of the sensing area SA, and then the touch position of the touch object OBJ is changed to the first characteristic position P1 having the coordinate information (x, y). At this time, according to the coordinate information (x, y), the position of the first local sensing block PA _1 is updated to the second local sensing block PA _2, and the second local sensing block PA _2 covers the coordinate information (x, y). After the second local sensing block PA _2 is generated, in step S210, image features are sensed and captured in the second local sensing block PA _ 2.
Referring to fig. 3, fig. 3 is a flowchart illustrating a method of a touch method according to another embodiment of the invention. Compared to fig. 2, the touch method of fig. 3 further includes determining whether the sensing area SA is touched by the touch object OBJ in step S200A. In an embodiment, the optical sensing device 10 performs an overall scan on the sensing area SA to determine whether there is a touch object OBJ in a state with a low frame update frequency. In step S200B, when the optical sensing device 10 determines that the sensing area SA is touched by the touch object OBJ, the first initial characteristic position P _ int of the touch object OBJ in the sensing area SA is further detected. In step S200C, a first local sensing block PA _1 is determined in the sensing region according to the first initial feature position P _ int. That is to say, as shown in fig. 1, when the touch object OBJ touches the sensing area SA, the optical sensing device 10 can detect a position (a first initial characteristic position P _ int) touched by the touch object OBJ, and at this time, the optical sensing device 10 further selects a local block in the sensing area SA as a first local sensing block PA _1 according to the first initial characteristic position P _ int, where the first local sensing block PA _1 covers the first initial characteristic position P _ int. In step S204 of the embodiment of fig. 3, when it is determined that the touch object OBJ is not located on the sensing area SA, the step returns to the step of determining whether the sensing area is touched by the touch object OBJ. In the embodiment of fig. 3, if the touch object OBJ is not detected in the second local sensing block PA _2, the step of determining whether the sensing area is touched by the touch object OBJ in fig. 3 is performed again. Specifically, when the touch position of the touch object OBJ is changed to the first characteristic position P1, the touched position of the touch object OBJ is located in the second local sensing area PA _2, and the optical sensing device 10 is located in the second local sensing area PA _2 for sensing and capturing the image characteristic of the touch object OBJ. If the touch object OBJ changes to the first characteristic position P1 and the touch object OBJ immediately leaves the second local sensing area PA _2, the optical sensing device 10 returns to the state of scanning the sensing area SA to determine whether the touch object OBJ touches the sensing area SA again.
As shown in fig. 3, in an embodiment, the step of calculating the coordinate information (x, y) of the first characteristic position P1 of the touch object OBJ in fig. 2 includes steps S206A and S206B. In step S206A, coordinate variation information of the first initial feature position P _ int is calculated. In step S206B, coordinate information (x, y) of the first characteristic position P1 of the touch object OBJ is calculated according to the coordinate variation information and the first initial characteristic position P _ int. In a practical example, as shown in fig. 1, the touch object OBJ is touched by the coordinate information (xi, yi) of the first initial characteristic position P _ int, that is, the photo sensing device 10 detects the coordinate information (xi, yi) initially touched by the touch object OBJ on the sensing area SA. At this time, when the touch object OBJ starts moving from the position of the coordinate information (xi, yi) to another position, the amount of change in the movement is assumed to be (dx, dy). The photo sensing device 10 calculates the coordinate information (x, y) of the first characteristic position P1 of the touch object OBJ according to the coordinate variation information (i.e. the variation (dx, dy) of the movement) and the coordinate information (xi, yi) of the first initial characteristic position P _ int. In this embodiment, the coordinate information (x, y) of the first feature position P1 is substantially (xi + dx, yi + dy). The movement variation (dx, dy) of the touch object OBJ is only used as an exemplary illustration in the foregoing embodiments, and the invention is not limited thereto.
In an embodiment, the step of sensing and capturing the image feature of the touch object OBJ in the first local sensing block PA _1 in fig. 2 includes enabling the kth to (k + N) th gate lines, where k and (k + N) are positive integers less than or equal to N. Specifically, referring to fig. 1 and fig. 4 together, fig. 4 is a timing control diagram according to an embodiment of the invention. As shown in fig. 1 and 4, when the photo sensing device 10 detects the first initial characteristic position P _ int of the touch object OBJ, in the first frame FR1, the driving signal GT of the gate driving unit 12 is set to a high level in a period of time, so as to enable the kth to (k + n) th gate lines on the sensing area SA, while the gate lines other than the kth to (k + n) th gate lines are in an disabled state (the driving signal GT is in a low level state), and the enabled kth to (k + n) th gate lines on the sensing area SA are within the range of the first local sensing block PA _ 1.
In this embodiment, when the touch object OBJ moves from the first initial feature position P _ int to the first feature position P1, as shown in fig. 1 and 4, in the second screen frame FR2, the optical sensing device 10 updates the first local sensing block PA _1 to the second local sensing block PA _2 according to the coordinate information (x, y) of the first feature position P1, which may be represented as (xi + dx, yi + dy), so as to enable the gate lines from (k + m) th to (k + m + n). In other words, in the embodiment of fig. 1, when the touch object OBJ moves from the first initial characteristic position P _ int to the first characteristic position P1, the photo sensing device 10 can further calculate the gate lines to be enabled to be the (k + m) th to (k + m + n) th gate lines according to the variation dy of the movement of the touch object OBJ along the vertical axis. In the touch method of the present invention, as shown in fig. 4, when the driving signal GT of the gate driving unit 12 is set to a high level, the frequency of the clock signal CLK in the specific interval is converted from the originally higher frequency f1 to a lower frequency f2, so that it is not necessary to use an Analog-to-digital converter (ADC). At this time, in the specific interval, the light sensing device 10 senses and captures the image feature of the touch object OBJ through the enabled gate line at the lower frequency f 2. Since the light sensing device 10 performs sensing in the local sensing block at the lower frequency f2 and maintains the higher frequency f1 in the other non-local sensing blocks, the overall sensing speed is still not decreased, and the high sensing speed can be maintained besides the high resolution of the captured image features.
In another embodiment, the step of sensing and capturing the image feature of the touch object OBJ in the first local sensing block PA _1 in fig. 2 includes reading the p-th to (p + M) -th sensing lines, where p and (p + M) are positive integers less than or equal to M. Specifically, referring to fig. 5, fig. 5 is a schematic view illustrating a photo sensing device according to another embodiment of the invention. As shown in fig. 5, the photo sensing device has N sensing lines, wherein the sensing unit 14 is connected to the sensing region SA. When the photo sensing device 10 detects the first initial feature position P _ int of the touch object OBJ, the sensing unit 14 reads the pth to (P + m) th sensing lines on the sensing area SA, and other sensing lines except the pth to (P + m) th sensing lines are not read, and the range of the pth to (P + m) th sensing lines is the range of the first local sensing area PA _ 1. The optical sensing device 10 senses and captures image features of the touch object OBJ by reading the pth to (p + m) th sensing lines on the sensing area SA. Compared with the embodiment in which the local sensing blocks are selected in the horizontal direction, the embodiment in which the local sensing blocks are selected in the vertical direction has the same timing control manner and principle as the embodiment, and thus, the detailed description thereof is omitted. In the two embodiments, the optical sensing device 10 is only enabled with the horizontal gate lines or the vertical sensing lines, however, in one embodiment, when the touch object OBJ touches the sensing area SA, the optical sensing device 10 is enabled with the N gate lines and M sensing lines, at this time, compared to the two embodiments, the local sensing area selected on the sensing area SA by the optical sensing device 10 is smaller, so that the overall power consumption of the optical sensing device 10 during sensing can be reduced.
Referring to fig. 6a and 6b together, fig. 6a is a schematic diagram of a photo sensing device according to another embodiment of the invention. FIG. 6b is a timing control diagram according to another embodiment of the present invention. As shown in fig. 6a and 6b, the photo sensing device 10 has data lines D1-D512. When the touch object OBJ has not touched the sensing area SA, the multiplexer 16 selects and reads all the Data lines D1-D512 in the sensing time period T1 according to the control signal Ctrl sent by the timing controller 18, and the analog-to-digital converter 20 converts the read analog Data signals into digital Data signals Data _ out including the digital Data DA 1-DA 100. When the touch object OBJ touches the second position P2 of the sensing area SA in the sensing period T2, the multiplexer 16 selects only the Data lines D1-D100 of the reading portion to capture the image features of the touch object OBJ according to the control signal Ctrl sent by the timing controller 18, and the range of the Data lines D1-D100 is the local sensing block, and the analog-to-digital converter 20 converts the read analog Data signal into the digital Data signal Data _ out including the digital Data DA 1-DA 100. In the next sensing period T3, when the touch object OBJ moves from the second position P2 to the third position P3, the multiplexer 16 selects the read data lines D51-D150 to capture the image feature of the touch object OBJ. That is, in this embodiment, when the touch position of the touch object OBJ is changed, the range size of the local sensing area remains unchanged, and moves upward by a distance of fifty data lines with the touch object OBJ. The analog-to-digital converter 20 is further caused to convert the read analog Data signals into digital Data signals Data _ out, which include the digital Data DA51 to DA 150.
In an embodiment, the step of determining whether the sensing region is touched by the touch object OBJ in fig. 3 includes enabling a part of N gate lines or a part of M sensing lines on the sensing region in one of the sensing periods to sense and capture the image feature of the touch object OBJ, and the first local sensing block includes the enabled part of N gate lines or the part of M sensing lines. Specifically, referring to fig. 7, fig. 7 is a schematic view illustrating a photo sensing device according to another embodiment of the invention. As shown in fig. 7, the sensing area SA of the photo sensing device 10 is divided into a first local sensing block PA _1, a second local sensing block PA _2, a third local sensing block PA _3 and a fourth local sensing block PA _4, wherein the photo sensing device 10 respectively senses the local sensing blocks PA _1 to PA _4 in a plurality of sensing periods T1 to T4. That is, in this embodiment, the light sensing apparatus 10 enables a part of N gate lines or a part of M sensing lines in a specific local sensing region block for sensing in a specific time period.
For example, in the sensing period T1, the gate driving unit 12 enables a part of N gate lines included in the first local sensing block PA _1 for sensing, and in the sensing period T2, the gate driving unit 12 enables a part of N gate lines included in the second local sensing block PA _2 for sensing. In the same principle, the gate driving unit 12 enables a part of the N gate lines in the third and fourth local sensing blocks PA _3 and PA _4 respectively in the sensing periods T3 and T4. Therefore, for an example, it is assumed that when the touch object OBJ (a finger of a user) touches the first local sensing block PA _1 for touch in the sensing time period T1, the light sensing apparatus 10 can sense and acquire the image feature of the touch object OBJ through the enabled part N gate lines (e.g. the R-th to (R + N) -th gate lines shown in fig. 7) covered by the first local sensing block. In another embodiment, when the touch object OBJ (the finger of the user) touches the first local sensing block PA _1 in the sensing time period T1, the optical sensing device 10 reads a portion M of sensing lines included in the first local sensing block PA _1 through the sensing unit 14 to sense and capture the image feature of the touch object OBJ. In other sensing periods T2-T4, the operation and principle of the photo sensing device 10 are the same as those of the previous embodiments, and are not described herein again.
In summary, the touch method disclosed in the present invention dynamically adjusts the selected local block by selecting the local block in the sensing region of the light sensing device and enabling a part of the gate lines or the sensing lines through timing control, thereby improving the sensing speed of touch and maintaining the sensing quality with high resolution.
Although the present invention has been described with reference to the above embodiments, it is not intended to limit the invention. All changes and modifications that come within the spirit and scope of the invention are desired to be protected by the following claims. Reference is made to the appended claims for the full scope of the invention.
Claims (10)
1. A touch method is suitable for a light sensing device, the light sensing device is provided with a sensing area, the sensing area comprises N grid lines and M sensing lines, N and M are positive integers, the touch method comprises the following steps:
sensing and capturing an image characteristic of a touch object in a first local sensing area of the sensing area;
after sensing and capturing the image characteristic of the touch object, judging whether the touch object is positioned on the sensing area;
when the touch object is judged to be positioned on the sensing area, calculating coordinate information of a first characteristic position of the touch object;
updating the position of the first local sensing block according to the coordinate information to generate a second local sensing block of the sensing area; and
and sensing and capturing the image feature in the second local sensing area block.
2. The touch method of claim 1, further comprising:
judging whether the sensing area is touched by the touch object;
when the sensing area is touched by the touch object, detecting a first initial characteristic position of the touch object in the sensing area; and
and determining the first local sensing block in the sensing region according to the first initial characteristic position.
3. The touch method of claim 2, wherein when the touch object is not detected in the second local sensing area, the step of determining whether the sensing area is touched by the touch object is performed.
4. The touch method of claim 2, wherein the step of calculating the coordinate information of the first feature position of the touch object comprises:
calculating coordinate change information of the first initial characteristic position; and
and calculating the coordinate information of the first characteristic position of the touch object according to the coordinate change information and the first initial characteristic position.
5. The touch method of claim 2, wherein the step of determining whether the sensing region is touched by the touch object comprises enabling a portion of N gate lines or a portion of M sensing lines on the sensing region to sense and capture the image feature of the touch object during one of a plurality of sensing periods, wherein the first local sensing block comprises the enabled portion of the N gate lines or the enabled portion of the M sensing lines.
6. The touch method of claim 2, wherein the first local sensing area covers the first initial feature position of the touch object.
7. The touch method of claim 2, wherein when the touch object is determined not to be located on the sensing area, the step of determining whether the sensing area is touched by the touch object is performed.
8. The touch method of claim 1, wherein the touch object is a finger of a user, and the image feature is a fingerprint of the finger of the user.
9. The touch method of claim 1, wherein the step of sensing and capturing the image feature of the touch object in the first local sensing block comprises enabling k-th to (k + N) -th gate lines, wherein k and (k + N) are positive integers less than or equal to N.
10. The touch method of claim 1, wherein the step of sensing and capturing the image feature of the touch object in the first local sensing area comprises reading the p-th to (p + M) -th sensing lines, wherein p and (p + M) are positive integers less than or equal to M.
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| TW105137977A TWI595396B (en) | 2016-11-18 | 2016-11-18 | Touching method |
| TW105137977 | 2016-11-18 |
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| CN106843587B true CN106843587B (en) | 2020-02-18 |
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| TWI678634B (en) | 2017-11-28 | 2019-12-01 | 宏碁股份有限公司 | Fingerprint authentication method and electronic device |
| TWI691887B (en) * | 2019-01-16 | 2020-04-21 | 大陸商北京集創北方科技股份有限公司 | Optical sensing method integrating touch and fingerprint collection, touch display device and information processing device |
| TWI758801B (en) * | 2020-07-31 | 2022-03-21 | 敦泰電子股份有限公司 | Fingerprint identification method for in-display fingerprint display device and fingerprint identification and display driver integrated circuit and mobile device using the same |
| TWI735349B (en) * | 2020-10-13 | 2021-08-01 | 友達光電股份有限公司 | Light detecting device and detecting method thereof |
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| TWI595396B (en) | 2017-08-11 |
| CN106843587A (en) | 2017-06-13 |
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