TWI691887B - Optical sensing method integrating touch and fingerprint collection, touch display device and information processing device - Google Patents

Abstract

An optical sensing method integrating touch and fingerprint acquisition is used to realize an optical sensor array. The method includes: determining a sensing mode according to an application program; and when the sensing mode is a fingerprint sensing In the mode, a fingerprint sensing area is selected in the optical sensor array to execute a fingerprint sensing procedure; when the sensing mode is a touch sensing mode, one is defined in the optical sensor array A touch array, and execute a touch sensing procedure on the touch array; and when the sensing mode is a fingerprint and touch sensing mode, perform a step on a first area in the optical sensor array A fingerprint sensing program, and a touch area is defined in a second area other than the first area of the optical sensor array, and a touch sensing process is performed on the touch area.

Description

Optical sensing method integrating touch and fingerprint collection, touch display device and information processing device

The invention relates to a method of touch sensing and fingerprint sensing, in particular to a method of integrating optical touch sensing and optical fingerprint sensing.

With the popularity and vigorous development of mobile devices, touch display panels have become indispensable components. In addition, in the latest trend, fingerprint recognition has also become an indispensable function.

In addition, in a general OLED (organic light emitting diode; organic light emitting diode) display panel, a capacitive touch chip detects the capacitance value of a sensing electrode array on the panel to provide a touch control function, and One reads out the light sensing signal of another layer of photodiode sensing array on the wafer collection panel to provide fingerprint recognition function.

Please refer to FIGS. 1a-b, wherein FIG. 1a illustrates a schematic diagram of a conventional OLED display device having a capacitive touch sensing function and an optical fingerprint collection function, wherein the conventional OLED display device is on a panel 10 is provided with a capacitive touch chip 11 at the bottom to detect the capacitance value of a sensing electrode array (not shown in the figure) on the panel 10, and a readout chip 12 at the top to collect the data on the panel 10 The light sensing signal of another layer of photodiode sensing array (not shown in the figure); and FIG. 1b shows another conventional OLED display device with a capacitive touch sensing function and an optical fingerprint collection function Wherein the conventional OLED display device is provided with a capacitive touch chip 11 at the bottom of a panel 10 to detect the capacitance value of a sensing electrode array (not shown) in the panel 10, and A readout wafer 12 is provided to collect the light sensing signal of another layer of photodiode sensing array (not shown in the figure) on the panel 10.

However, the simultaneous arrangement of a layer of sensing electrode array and a layer of photodiode sensing array on the panel 10 will increase the cost. In addition, since it is necessary to bond the two chips of the capacitive touch chip 11 and the readout chip 12 to the panel 10 to connect with the layer of sensing electrode array and the layer of photodiode sensing array, the OLED display device Institutional design difficulty will also increase.

In order to solve the above problems, there is an urgent need for a novel method integrating optical touch sensing and optical fingerprint sensing.

An object of the present invention is to disclose an optical sensing method integrating touch and fingerprint collection, which can provide both a touch sensing function and a fingerprint collection function by a layer of photodiode sensing array to reduce panel movement Line complexity and simplified chip configuration issues.

Another object of the present invention is to disclose an optical sensing method integrating touch and fingerprint collection, which can provide a touch sensing by detecting a layer of photodiode sensing array with two different sensing resolutions Function and a fingerprint collection function.

Another object of the present invention is to disclose an optical sensing method integrating touch and fingerprint collection, which can define two different sensing resolutions on two regions of a layer of photodiode sensing array to A fingerprint collection function and a touch sensing function are provided in the two areas respectively.

To achieve the aforementioned objective, an optical sensing method integrating touch and fingerprint collection is proposed, which is realized by planning and driving an optical sensor array with a control circuit, and the optical sensor array has a first Resolution, the method includes:

A sensing mode is determined according to an application program to execute a fingerprint sensing process and/or a touch sensing process. The sensing mode includes a fingerprint sensing mode, a touch sensing mode, and a fingerprint and touch sensing Measurement mode; and

When the sensing mode is the fingerprint sensing mode, a fingerprint sensing area is selected in the optical sensor array to execute the fingerprint sensing procedure; when the sensing mode is the touch sensing In the mode, a touch array is defined in the optical sensor array, and the touch sensing process is performed on the touch array, wherein the touch array has a second resolution, and the second The resolution is lower than the first resolution; and when the sensing mode is the fingerprint and touch sensing mode, the fingerprint sensing procedure is performed on a first area in the optical sensor array, And a touch area is defined in a second area other than the first area of the optical sensor array, and the touch sensing procedure is performed on the touch area, wherein the touch area has a A third resolution, and the third resolution is lower than the first resolution.

In one embodiment, the touch array or the touch area is formed by drawing points from a plurality of optical sensors of the optical sensor array.

In an embodiment, each touch point of the touch array or the touch area is formed by performing a parallel operation on a plurality of optical sensors of the optical sensor array.

In one embodiment, the parallel operation is achieved by simultaneously turning on multiple rows of the optical sensor array.

In one embodiment, the parallel operation is implemented using a connecting circuit.

To achieve the foregoing objective, the present invention further proposes a touch display device having a touch display drive circuit and a touch display panel. The touch display drive circuit is used to drive the touch display panel to achieve the aforementioned integration An optical sensing method for touch and fingerprint collection, wherein the touch display panel has the optical sensor array described above, and the touch display driving circuit includes the control circuit.

In addition, the present invention also provides an information processing device having the aforementioned touch display device to provide an optical sensing function integrating touch and fingerprint collection.

In a possible embodiment, the information processing device may be a smart phone or a portable computer device.

In order to enable your reviewer to further understand the structure, features and purpose of the present invention, the drawings and the detailed description of the preferred embodiments are attached.

Please refer to FIG. 2, which illustrates a flowchart of an embodiment of an optical sensing method integrating touch and fingerprint collection according to the present invention, wherein the optical sensing method is planned and driven by a control circuit and drives an optical sensor array This is achieved, and the optical sensor array has a first resolution.

As shown in Figure 2, the method includes the following steps:

Step a: Determine a sensing mode to execute a fingerprint sensing process and/or a touch sensing process according to an application program, the sensing mode includes a fingerprint sensing mode, a touch sensing mode and a fingerprint Touch sensing mode; and

Step b: When the sensing mode is the fingerprint sensing mode, select a fingerprint sensing area in the optical sensor array to execute the fingerprint sensing process; when the sensing mode is the touch When controlling the sensing mode, a touch array is defined in the optical sensor array, and the touch sensing procedure is performed on the touch array, wherein the touch array has a second resolution, and The second resolution is lower than the first resolution; and when the sensing mode is the fingerprint and touch sensing mode, the fingerprint sensing is performed on a first area in the optical sensor array A sensing program, and a touch area is defined in a second area other than the first area of the optical sensor array, and the touch sensing process is performed on the touch area, wherein the touch The zone has a third resolution, and the third resolution is lower than the first resolution.

In addition, in an embodiment, the touch array and the touch area described in step b may be formed by drawing points from a plurality of optical sensors of the optical sensor array.

In addition, in an embodiment, each touch point of the touch array and the touch area described in step b may be formed by performing a parallel operation on a plurality of optical sensors of the optical sensor array, And the parallel operation can be realized by simultaneously turning on a plurality of rows of the optical sensor array or by a connecting circuit.

The principle of the present invention will be explained below:

Generally speaking, fingerprint sensing requires higher resolution than touch sensing. For example, the pixel size of a fingerprint image is usually about 50 microns long and 50 microns wide, and the size of a basic touch sensing element is about 4000 microns long and 4000 microns wide. In addition, the scanning frequency requirement of touch sensing is higher than that of fingerprint sensing. For example, the scanning frequency for general touch sensing is about 30 to 90 Hz, while the scanning frequency for fingerprint sensing is about 1 to 20 Hz.

Please refer to FIG. 3, which is a schematic diagram of an optical sensing device adopted in the present invention, wherein the optical sensing device includes the optical sensor array and the control circuit used in the method of FIG. 2. As shown in FIG. 3, the optical sensor device has an optical sensor array 100 and a control circuit including a gate driving circuit 110 and a readout chip 120, wherein the optical sensor array 100 has a plurality of sensors Each pixel has a switching element 101, a capacitor 102, and a light-sensing diode 103. Each capacitor 102 is used to match a light-sensing diode 103 with a brightness The generated current signal is converted into a voltage signal, and each switching element 101 is controlled by a gate signal GI, and I is any number from 1 to an integer N to output a voltage signal to the readout chip One input terminal SJ of 120, J is any number from 1 to integer M.

During operation, if all the optical sensor arrays 100 are scanned once, the required scanning time can be expressed as:

Scan time = (total number of rows*total number of columns/N _AFE )* T _AFE *2+ T _EXP , where N _AFE is the number of analog front ends (Analog Front End; AFE) channels of the readout chip 120 while acquiring signals, for example 200; T _AFE is the time it takes to read the signal from the analog front-end of the chip 120 and it takes one time. Due to the limited noise requirements, it is usually in the microsecond level, usually 50 microseconds; T _EXP is the exposure time of the photodiode sensor , Usually in the millisecond level, can be selected from 1 to 10 milliseconds, such as 5 milliseconds in the application of touch sensing; multiple 2 is because the optical acquisition requires three steps to complete: the first step is to zero the photodiode sensor The second step exposes the photodiode sensor; and the third step collects the signal generated by the photodiode sensor.

Please refer to FIG. 4a, which shows a schematic diagram of the entire optical sensor array 100 being scanned when a finger performs a touch operation on a local area 100a on the optical sensor array 100, wherein each sensing pixel is Black dots indicate that scanning has been started. Assuming that the total number of rows of the optical sensor array 100 = 2560 and the total number of columns = 1440, according to the above formula and parameters, the scan time = 1.8482s can be calculated. However, this scan time is unacceptable for touch. In this regard, the present invention proposes two solutions:

Option One:

Reduce the number of pixels to be sensed. For example, please refer to FIG. 4b, which illustrates a schematic diagram of the optical sensor array 100 being scanned by a pick point when a finger performs a touch operation on a local area 100a on the optical sensor array 100, where black dots represent There are sensing pixels that are turned on for scanning, and white dots represent sensing pixels that are not turned on for scanning. As shown in FIG. 4b, in this pick-point scanning process, since only the odd rows and odd columns of the optical sensor array 100 are collected, the amount of data can be reduced to 1/4, and the time required can be reduced accordingly. In addition, if the number of columns we select is equal to the number of channels of the readout wafer 120, the scan time is proportional to the number of rows. For example, when the number of columns = 200 and the number of rows = 32, the scanning time only needs to be 32*50us*2+5ms=8.2ms, that is to say, the corresponding scanning frequency can reach about 122Hz, which is enough for touch scanning demand.

In addition, for the conventional GOA (gate on array; gate drive circuit substrate) with the gate drive circuit fabricated on the glass substrate, since it can only start scanning from the first line when performing the drive scanning operation, it cannot To achieve the point-drawing operation for the row direction. In this case, we can divide the screen into multiple sub-screens, and divide the screen into as many sub-screens as we need to draw lines, so that each sub-screen can be controlled independently; or only the selected lines can be scanned normally and invalid for others Quick scan of lines to save time; or a combination of the two methods.

Option II:

Due to the high touch scan frequency requirements, the exposure time of the photodiode is relatively short and the signal volume is small. In this regard, we can enable the function of all gate on (all gates in the sub-screen are open) during the process of the GOA driver scanning each sub-screen. In this way, in one signal acquisition of the AFE in the readout wafer 120, not only the signal amount of one sensing pixel is collected, but also the signal amount of a row of sensing pixels in the sub-screen, that is, the signal the amount.

In addition, we can also use a connecting circuit to simultaneously open multiple switches connected to the same AFE to increase the signal amount. Please refer to FIG. 5, which is a schematic diagram of adding a connection circuit 130 to the optical sensing device of FIG. 3. As shown in FIG. 5, the number of input terminals S _J received by the front-end circuit 121 of various ratios in the readout chip 120 can be determined by the switching operation of the connection circuit 130, so as to realize the parallel operation described above.

Through the above scheme, we can be compatible with the optical touch scheme based on the optical photodiode sensor array without making too many changes, and realize the integration of optical fingerprint and optical touch. The production cost is reduced, and the difficulty of fitting with the panel is reduced.

According to the above description, the present invention further discloses a touch display device. Please refer to FIG. 6, which illustrates a block diagram of an embodiment of the touch display device of the present invention. As shown in FIG. 6, a touch display device 200 includes a touch display driving circuit 210 and a touch display panel 220, wherein the touch display driving circuit 210 is used to drive the touch display panel 220 and the touch display panel 220 There is an optical sensor array described in the method flow of FIG. 2 and the touch display driving circuit 210 includes the control circuit described in the method flow of FIG. 2 to implement the optical sensing method of integrated touch and fingerprint collection.

In addition, the present invention also discloses an information processing device, which includes the touch display device 200 shown in FIG. 6 to provide an optical sensing function integrating touch and fingerprint collection, wherein the information processing device may be a smart phone Or a portable computer device.

With the design disclosed above, the present invention has the following advantages:

1. The optical sensing method of integrated touch and fingerprint collection of the present invention can provide both a touch sensing function and a fingerprint collection function by a layer of photodiode sensing array, so as to reduce the routing complexity of the panel and Simplify the chip configuration problem.

2. The optical sensing method of integrated touch and fingerprint collection of the present invention can detect a layer of photodiode sensing array with two different sensing resolutions to provide a touch sensing function and a fingerprint collection, respectively Features.

3. The optical sensing method of integrated touch and fingerprint collection of the present invention can define two different sensing resolutions on the two regions of a layer of photodiode sensing array, so that the two regions Provide a fingerprint collection function and a touch sensing function respectively.

The case disclosed in this case is a preferred embodiment, and any part of the modification or modification that originates from the technical idea of this case and can be easily inferred by those skilled in the art, does not deviate from the patent scope of this case.

In summary, regardless of the purpose, means and effects of this case, it shows that it is very different from the conventional technology, and its first invention is practical and indeed meets the patent requirements of the invention. Society is for supreme prayer.

10: Panel

11: Capacitive touch chip

12: Read the chip

100: optical sensor array

100a: local area

101: switching element

102: capacitance

103: Light sensing diode

110: Gate drive circuit

120: read chip

121: Analog front-end circuit

130: Connect the circuit

200: Touch display device

210: Touch display drive circuit

220: touch display panel

Step a: Determine a sensing mode to execute a fingerprint sensing process and/or a touch sensing process according to an application program, the sensing mode includes a fingerprint sensing mode, a touch sensing mode and a fingerprint Touch sensing mode

Step b: When the sensing mode is the fingerprint sensing mode, select a fingerprint sensing area in the optical sensor array to execute the fingerprint sensing process; when the sensing mode is the touch When controlling the sensing mode, a touch array is defined in the optical sensor array, and the touch sensing procedure is performed on the touch array, wherein the touch array has a second resolution, and The second resolution is lower than the first resolution; and when the sensing mode is the fingerprint and touch sensing mode, the fingerprint sensing is performed on a first area in the optical sensor array A sensing program, and a touch area is defined in a second area other than the first area of the optical sensor array, and the touch sensing process is performed on the touch area, wherein the touch The zone has a third resolution, and the third resolution is lower than the first resolution

FIG. 1a is a schematic diagram of a conventional OLED display device having a capacitive touch sensing function and an optical fingerprint collection function. FIG. 1b is a schematic diagram of another conventional OLED display device having a capacitive touch sensing function and an optical fingerprint acquisition function. FIG. 2 illustrates one of the optical sensing methods of integrated touch and fingerprint acquisition of the present invention. Example flow chart. 3 is a schematic diagram of an optical sensing device adopted in the present invention. 4a shows a schematic diagram of the entire optical sensor array being scanned when a finger performs a touch operation on a partial area on the optical sensor array of FIG. 3. FIG. 4b shows a schematic diagram of the optical sensor array being scanned by a pick point when a finger performs a touch operation on a partial area on the optical sensor array of FIG. 3. FIG. 5 is a schematic diagram of adding a connection circuit to the optical sensing device of FIG. 3. 6 is a block diagram of an embodiment of the touch display device of the present invention.

Step a: Determine a sensing mode to execute a fingerprint sensing process and/or a touch sensing process according to an application program, the sensing mode includes a fingerprint sensing mode, a touch sensing mode and a fingerprint Touch sensing mode

Step b: When the sensing mode is the fingerprint sensing mode, select a fingerprint sensing area in the optical sensor array to execute the fingerprint sensing process; when the sensing mode is the touch When controlling the sensing mode, a touch array is defined in the optical sensor array, and the touch sensing procedure is performed on the touch array, wherein the touch array has a second resolution, and The second resolution is lower than the first resolution; and when the sensing mode is the fingerprint and touch sensing mode, the fingerprint sensing is performed on a first area in the optical sensor array A sensing program, and defining a touch area in a second area other than the first area of the optical sensor array, and performing the touch sensing process on the touch area, wherein the touch The zone has a third resolution, and the third resolution is lower than the first resolution

Claims (5)

An optical sensing method integrating touch and fingerprint collection is realized by planning and driving an optical sensor array with a control circuit, and the optical sensor array has a first resolution. The method includes: according to a The application program determines a sensing mode to execute a fingerprint sensing process and/or a touch sensing process. The sensing mode includes a fingerprint sensing mode, a touch sensing mode, and a fingerprint and touch sensing mode ; And when the sensing mode is the fingerprint sensing mode, select a fingerprint sensing area in the optical sensor array to execute the fingerprint sensing process; when the sensing mode is the touch In the sensing mode, a touch array is defined in the optical sensor array, and the touch sensing procedure is performed on the touch array, wherein the touch array has a second resolution, and the The second resolution is lower than the first resolution; and when the sensing mode is the fingerprint and touch sensing mode, the fingerprint sensing is performed on a first area in the optical sensor array A program, and defining a touch area in a second area other than the first area of the optical sensor array, and performing the touch sensing procedure on the touch area, wherein the touch area Has a third resolution, and the third resolution is lower than the first resolution; wherein the touch array or the touch area are drawn from a plurality of optical sensors of the optical sensor array While forming. An optical sensing method integrating touch and fingerprint acquisition is used to realize an optical sensor array. The method includes: determining a sensing mode according to an application program; and when the sensing mode is a fingerprint sensing In the mode, a fingerprint sensing area is selected in the optical sensor array to execute a fingerprint sensing procedure; when the sensing mode is a touch sensing mode, one is defined in the optical sensor array A touch array, and execute a touch sensing procedure on the touch array; and when the sensing mode is a fingerprint and touch sensing mode, perform a step on a first area in the optical sensor array A fingerprint sensing program, and a touch area is defined in a second area other than the first area of the optical sensor array, and a touch sensing process is performed on the touch area; wherein the touch Each touch point of the array or the touch area is composed of a complex number of the optical sensor array An optical sensor is formed by performing a drawing operation. A touch display device having a touch display drive circuit and a touch display panel, wherein the touch display drive circuit is used to drive the touch display panel to achieve the scope of claims 1 to 2 The optical sensing method of any one of the integrated touch and fingerprint collection, wherein the touch display panel has the optical sensor array, and the touch display driving circuit includes the control circuit. An information processing device having a touch display device as described in item 3 of the patent application scope to provide an optical sensing function integrating touch and fingerprint collection. The information processing device described in item 4 of the patent application scope is a smart phone or a portable computer device.

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