CN106484197B - Contact panel and its driving method, drive device - Google Patents
Contact panel and its driving method, drive device Download PDFInfo
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- CN106484197B CN106484197B CN201610922137.1A CN201610922137A CN106484197B CN 106484197 B CN106484197 B CN 106484197B CN 201610922137 A CN201610922137 A CN 201610922137A CN 106484197 B CN106484197 B CN 106484197B
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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
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
- G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
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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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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
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Abstract
The invention discloses a kind of contact panel and its driving method, drive device, belong to touch-control field.The contact panel includes photosensitive material layer, the lead electrode layer on the surface for the first side for being arranged on photosensitive material layer, a plurality of first touch control electrode extended in a first direction, and a plurality of second touch control electrode extended in a second direction；Wherein, contact panel has a touch area, and a plurality of first touch control electrode and a plurality of second touch control electrode are arranged in a crossed manner in touch area；Part of first touch control electrode between two adjacent second touch control electrodes contacts with the surface of the second side of photosensitive material layer；First touch control electrode, photosensitive material layer and lead electrode layer form photodiode in the region that the first touch control electrode and photosensitive material layer contact with each other.The present invention be multiplexed with based on the first touch control electrode photodiode electrode design, it is possible to achieve photosensitive contact panel it is lightening, meet its use demand under more application scenarios.
Description
Technical Field
The present invention relates to the field of touch technologies, and in particular, to a touch panel, a driving method thereof, and a driving apparatus thereof.
Background
Currently, touch panels have become one of the most popular human interface devices. For example, the conventional capacitive touch panel determines the position where a finger or a conductor touches the panel by detecting the variation of capacitance at the position where two scanning lines cross by using a plurality of scan lines in the row direction and a plurality of scan lines in the column direction which are configured in a staggered manner, and determines the movement amount and the movement speed of the finger or the conductor by using the variation of the position where the finger touches the panel.
With the increasing diversification of the use demands, some manufacturers want to integrate the surface light sensing function into the touch panel. In this regard, the most common way of integrating functions is to stack the photosensor array substrate above or below the original touch panel, so as to realize surface sensitization by the photosensor array without affecting the touch function. However, compared with the conventional touch panel, the thickness occupied by at least one entire photosensor array substrate needs to be increased, and it is difficult to satisfy the requirements of light weight and thinness of the touch panel and its application products.
Disclosure of Invention
The invention provides a touch panel, a driving method thereof and a driving device thereof, aiming at the defects in the prior art, and the touch panel with a light and thin surface light sensing function can be realized.
In a first aspect, the present invention provides a touch panel, including a photosensitive material layer, a lead electrode layer disposed on a surface of a first side of the photosensitive material layer, a plurality of first touch electrodes extending in a first direction, and a plurality of second touch electrodes extending in a second direction; wherein,
the touch panel is provided with a touch area, and the first touch electrodes and the second touch electrodes are arranged in the touch area in a crossed mode;
the part of the first touch electrode between two adjacent second touch electrodes is in contact with the surface of the second side of the photosensitive material layer;
the first touch electrode, the photosensitive material layer and the lead electrode layer form a photosensitive diode in a region where the first touch electrode and the photosensitive material layer are in mutual contact.
In one possible implementation, the touch panel has a touch surface; the photosensitive material layer is positioned on one side of the first touch electrode, which is far away from the touch surface; the lead electrode layer is located on one side of the photosensitive material layer far away from the touch surface.
In another possible implementation manner, the photosensitive material layer includes a plurality of photosensitive material blocks separated from each other, and a surface of a second side of each of the photosensitive material blocks and one of the first touch electrodes are in contact with each other between two adjacent second touch electrodes.
In another possible implementation manner, the lead electrode layer includes a plurality of lead electrodes separated from each other, and each of the lead electrodes is in contact with a surface of the first side of the photosensitive material block located between two adjacent second touch electrodes.
In another possible implementation manner, each of the first touch electrodes is connected to a touch driving signal input end outside the touch area; the second touch control electrodes are respectively connected with a touch control sensing signal output end outside the touch control area; the plurality of lead electrodes are respectively connected with a light sensing signal output end outside the touch area.
In another possible implementation, the photosensitive material layer is arranged on the whole surface; the lead electrode layer is arranged on the whole surface; the first touch control electrodes are respectively connected with a touch control sensing signal output end outside the touch control area; the second touch control electrodes are respectively connected with a touch control driving signal input end outside the touch control area; the lead electrode is connected with a light sensing signal output end outside the touch area.
In another possible implementation manner, a portion of the first touch electrode in a straight strip shape between two adjacent second touch electrodes extends toward a direction opposite to the second direction and/or the second direction, so that a surface of the second side of the photosensitive material layer and the extended portion are in contact with each other.
In a second aspect, the present invention further provides a driving method of any one of the above touch panels, including:
applying a touch driving signal to the plurality of first touch electrodes during a first time period of one driving cycle to receive a touch sensing signal at the plurality of second touch electrodes, or applying a touch driving signal to the plurality of second touch electrodes during a first time period of one driving cycle to receive a touch sensing signal at the plurality of first touch electrodes;
applying a photosensitive driving signal to the first touch electrodes in a second time period of one driving cycle to receive the light sensing signal at the lead electrode layer, or applying a photosensitive driving signal to the lead electrode layer in a second time period of one driving cycle to receive the light sensing signal at the first touch electrodes;
wherein the first and second time periods are staggered from each other within the driving period.
In one possible implementation, the photodiode is specifically an infrared photodiode; the driving method further includes:
fingerprint identification is carried out according to the touch sensing signal;
when the fingerprint of the human body is identified, judging whether the infrared characteristics of the finger of the organism are detected or not according to the light sensing signal;
when the infrared characteristic of the finger of the living organism is not detected, an alarm signal is generated that the source of the identified fingerprint is not a living organism.
In a third aspect, the present invention further provides a driving apparatus for a touch panel, including:
a first signal applying unit for applying a touch driving signal to the plurality of first touch electrodes within a first time period of one driving cycle to receive a touch sensing signal at the plurality of second touch electrodes, or applying a touch driving signal to the plurality of second touch electrodes within a first time period of one driving cycle to receive a touch sensing signal at the plurality of first touch electrodes;
a second signal applying unit, configured to apply a photosensitive driving signal to the plurality of first touch electrodes in a second time period of one driving cycle to receive the light sensing signal at the lead electrode layer, or apply a photosensitive driving signal to the lead electrode layer in the second time period of one driving cycle to receive the light sensing signal at the plurality of first touch electrodes;
wherein the first and second time periods are staggered from each other within the driving period.
According to the technical scheme, based on the design that the first touch electrode is reused as one electrode of the photosensitive diode, the provided touch panel can save the setting space and the manufacturing process of one electrode of the photosensitive diode, and compared with the touch panel before the integration of the surface photosensitive function, the thickness of the photosensitive material layer and the thickness of the lead electrode layer can be increased or even reduced, so that the light and thin of the photosensitive touch panel can be realized, and the use requirements of the touch panel under more application scenes are met.
Based on the design that a first time period for applying a touch driving signal and receiving a touch sensing signal and a second time period for applying a photosensitive driving signal and receiving a light sensing signal are staggered in a driving period, the provided driving method and driving device of the touch panel can be matched with any one of the touch panels to multiplex a first touch electrode into one electrode of a photosensitive diode on the premise of simultaneously realizing the touch sensing function and the light sensing function of the touch panel, so that the light and thin of the photosensitive touch panel are realized, and the use requirements of the touch panel in more application scenes are met.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view illustrating a disposing manner of touch electrodes in a touch panel according to an embodiment of the invention;
fig. 2 is a schematic view illustrating a disposing manner of a photosensitive material layer in a touch panel according to an embodiment of the invention;
fig. 3 is a schematic view illustrating a disposing manner of a lead electrode layer in a touch panel according to an embodiment of the invention;
3 FIG. 34 3 is 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 along 3 line 3 A 3- 3 A 3' 3 of 3 the 3 touch 3 panel 3 shown 3 in 3 FIG. 33 3 according 3 to 3 an 3 embodiment 3 of 3 the 3 present 3 invention 3; 3
Fig. 5 is a flowchart illustrating a method for manufacturing a touch panel according to an embodiment of the invention;
fig. 6 is a flowchart illustrating a driving method of a touch panel according to an embodiment of the invention;
fig. 7 is a schematic diagram illustrating an internal connection relationship of a touch panel according to an embodiment of the present invention;
fig. 8 is a schematic view illustrating an internal connection relationship of a touch panel according to another embodiment of the present invention;
3 FIG. 3 9 3 is 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 along 3 line 3 A 3- 3 A 3' 3 of 3 the 3 touch 3 panel 3 shown 3 in 3 FIG. 33 3 according 3 to 3 another 3 embodiment 3 of 3 the 3 present 3 invention 3; 3
Fig. 10 is a flowchart illustrating a method for manufacturing a touch panel according to another embodiment of the invention;
fig. 11 is a schematic cross-sectional view illustrating a touch panel according to another embodiment of the present invention;
fig. 12 is a schematic view illustrating a disposing manner of touch electrodes in a touch panel according to another embodiment of the invention;
fig. 13 is a partial flowchart illustrating a driving method of a touch panel according to another embodiment of the invention;
fig. 14 is a block diagram of a driving apparatus of a touch panel according to an embodiment of the present invention;
fig. 15 is a block diagram of a portion of a driving apparatus of a touch panel according to another embodiment of the invention.
Reference numerals:
10-substrate, 11-first touch electrode, 12-second touch electrode, 13-photosensitive material layer, 14-lead electrode layer, 15-first insulating layer, 16-second insulating layer, 17-third insulating layer, a 1-touch region, R1-first direction, R2-second direction, P1-touch driving signal INPUT terminal, P2-touch sensing signal OUTPUT terminal, P3-light sensing signal OUTPUT terminal, U1-shift register unit, INPUT-INPUT terminal, OUTPUT-OUTPUT terminal, RESET-RESET terminal, CLK 1-first clock signal terminal, CLK 2-second clock signal terminal, CLK-first clock signal, CLKB-second clock signal, STV-start signal.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic top view of a touch electrode layout in a touch panel according to an embodiment of the invention. As shown in fig. 1, the touch panel according to the embodiment of the invention includes a plurality of first touch electrodes 11 (only 8 touch electrodes are taken as an example in fig. 1) extending along a first direction R1 and a plurality of second touch electrodes 12 (only 9 touch electrodes are taken as an example in fig. 1) extending along a second direction R2, and the plurality of first touch electrodes 11 and the plurality of second touch electrodes 12 are arranged in a crossing manner within a touch area a1 of the touch panel (only an orthogonal crossing arrangement manner is taken as an example in the figure, and in other implementation manners, crossing arrangements at any other included angles may also be used). In order to make the illustration clear, the structures of the touch panel except for the first touch electrode 11 and the second touch electrode 12 are not shown in fig. 1. It is understood that, at an interval of the insulating laminated structure with an appropriate thickness, the first touch electrodes 11 and the second touch electrodes 12 may be matched with other external conditions to implement mutual capacitive touch sensing.
In addition to the first touch electrode 11 and the second touch electrode 12, the touch panel according to the embodiment of the invention further includes a photosensitive material layer 13 and a lead electrode layer 14. As shown in fig. 2, a portion of the first touch electrode 11 between two adjacent second touch electrodes 12 is in contact with a surface of the second side of the photosensitive material layer 13; as shown in fig. 3, on the basis of the structure shown in fig. 2, the lead electrode layer 14 is provided on the surface of the first side of the photosensitive material layer 13. In fig. 2 and 3, the side facing outward from the plane of the drawing is a first side of the photosensitive material layer 13, and the side facing inward from the plane of the drawing is a second side of the photosensitive material layer. Thus, the first touch electrode 11, the photosensitive material layer 13 and the lead electrode layer 14 form a photodiode in a region where the first touch electrode 11 and the photosensitive material layer 13 are in contact with each other. As an example, in fig. 2 and 3, the photosensitive material layer 13 is formed of an 8 × 8 square block-shaped photosensitive material block, the lead electrode layer 14 is formed of 8 lead electrodes extending in the second direction R2, one lead electrode of one lead electrode layer 14 is disposed on the surface of the first side of all the photosensitive material blocks between every two adjacent second touch electrodes 12, and the surface of the second side of each photosensitive material block is in contact with the portion of one first touch electrode 11 between the adjacent two second touch electrodes 12. For clarity of illustration, fig. 2 does not show the structures of the touch panel except for the first touch electrode 11, the second touch electrode 12 and the photosensitive material layer 13, and fig. 3 does not show the structures of the touch panel except for the first touch electrode 11, the second touch electrode 12, the photosensitive material layer 13 and the lead electrode layer 14.
It is understood that the formation of the photodiode means that the lead electrode layer 14 and the first touch electrode 11 contacting the photosensitive material layer 13 from the first side and the second side respectively become one of an anode electrode and a cathode electrode of the photodiode, and the photosensitive material layer 13 sandwiched between the anode electrode and the cathode electrode has characteristics required for forming the photodiode, such as forward conduction and reverse cutoff of current between the two electrodes, and change of current-voltage characteristics between the two electrodes under a specific illumination condition (for example, when the photosensitive material layer 13 is formed by using a semiconductor material, the doping condition of the semiconductor material between the anode electrode and the cathode electrode must be consistent with the structure of a PN junction required for forming the photodiode).
It should be noted that, in the embodiment of the present invention, the first touch electrode, the second touch electrode, and the lead electrode layer are mainly formed by materials with good electrical conductivity, such as a metal simple substance, an alloy, a metal compound, a metal mesh (MetalMesh), a Conductive Polymer (Conductive Polymer), and the like, and those skilled in the art can select the materials according to actual application requirements. For example, in order to make the touch panel have high light transmittance, at least one of the first touch electrode, the second touch electrode, and the lead electrode layer may be formed using indium tin oxide semiconductor (ITO), Metal Mesh (Metal Mesh), Silver nanowire (Silver nanowire), or Conductive Polymer (Conductive Polymer).
It should be noted that the photodiode described in the embodiments of the present invention mainly refers to a device capable of sensing the intensity of light of a given wavelength band irradiated onto an internal photosensitive material under the action of electrical signals applied to two electrodes, and the specific type can be selected by those skilled in the art according to the actual application requirements.
It can be seen that the first touch electrode in the embodiment of the present invention is used as an electrode of a photodiode on the basis of realizing a touch sensing function, so that if the touch panel in the embodiment of the present invention can simultaneously realize a touch sensing function and a surface light sensing function, compared with the combination of the existing touch panel and the optical sensor array substrate, the touch panel in the embodiment of the present invention omits a setting space and a manufacturing process of an electrode of a photodiode, and compared with the existing touch panel, the touch panel generally only needs to increase the thicknesses of a photosensitive material layer and a lead electrode layer (which are much smaller than the thickness of the optical sensor array substrate), so that the light and thin photosensitive touch panel can be realized, and the use requirements of the touch panel in more application scenarios can be met.
3 as 3 a 3 more 3 specific 3 example 3, 3 fig. 34 3 is 3 a 3 cross 3- 3 sectional 3 view 3 of 3 a 3- 3 a 3' 3 of 3 the 3 touch 3 panel 3 shown 3 in 3 fig. 33 3 according 3 to 3 an 3 embodiment 3 of 3 the 3 invention 3. 3 Referring to fig. 3 and 4, the touch panel according to the embodiment of the invention includes a substrate 10, a lead electrode layer 14, a photosensitive material layer 13, a first insulating layer 15, a plurality of first touch electrodes 11, a second insulating layer 16, a plurality of second touch electrodes 12, and a third insulating layer 17. Thus, the touch surface (front surface of the touch panel) of the touch panel is provided by the upper surface of the second insulating layer 17 shown in fig. 4; the substrate 10, not shown in fig. 3, is located in front of the lead electrode layer 14, and the third insulating layer 17, not shown in fig. 3, is located behind the plurality of second touch electrodes 12. Specifically, referring to fig. 5, the touch substrate according to the embodiment of the present invention can be manufactured by the following processes:
step 101: a pattern including a lead electrode layer is formed on a substrate.
Wherein the lead electrode layer includes a plurality of lead electrodes (for example, as shown in fig. 4) separated from each other. In one possible implementation, the pattern including the lead electrode layer may be formed by a patterning process of a primary conductor material (mainly referring to a process of etching a desired pattern using a patterned photoresist as a mask, the same applies below).
Step 102: and forming a pattern including a photosensitive material layer on the lead electrode layer, and forming a first insulating layer in a region except the pattern including the photosensitive material layer.
Wherein the photosensitive material layer comprises a plurality of photosensitive material blocks (such as shown in fig. 2) separated from each other, and the upper surface of the first insulating layer is flush with or approximately flush with the upper surface of the photosensitive material layer. In a possible implementation manner, step 102 specifically includes: forming a first intrinsic semiconductor layer covering the substrate and the lead electrode layer; performing ion implantation on the first intrinsic semiconductor layer by using the patterned photoresist as a mask to form a first doped region of the photosensitive material layer; forming a second intrinsic semiconductor layer covering the first intrinsic semiconductor layer; stripping the photoresist layer as a mask; performing ion implantation on the second intrinsic semiconductor layer by using the patterned photoresist as a mask to form a second doped region of the photosensitive material layer; the photoresist layer as a mask is stripped. Thus, the non-conductive intrinsic semiconductor forms the first insulating layer, and the upper surface of the first insulating layer can be flush with the upper surface of the photosensitive material layer. In another possible implementation manner, step 102 specifically includes: forming a photoresist layer covering the substrate and the lead electrode layer; removing the photoresist in the setting area of the photosensitive material layer through a process including development and exposure to form a groove with the bottom exposing the lead electrode layer; the layer of photosensitive material is formed (e.g., by filling, printing, or the patterning process described above) within the recess such that the upper surface of the layer of photosensitive material is approximately even with the upper surface of the layer of photoresist. Thereby, the formed photoresist layer forms the first insulating layer.
Step 103: a pattern including a plurality of first touch electrodes (for example, as shown in fig. 1) is formed on the first insulating layer and the photosensitive material layer.
The pattern comprising the plurality of first touch electrodes covers the upper surface of the photosensitive material layer. In one possible implementation manner, the pattern including the plurality of first touch electrodes may be formed by a patterning process of a primary conductor material.
Step 104: and forming a second insulating layer covering the plurality of first touch electrodes and the first insulating layer.
In one possible implementation, the second insulating layer may be formed by a deposition or coating process of a primary insulating material (e.g., photoresist, silicon oxide, silicon nitride, etc.).
Step 105: and forming a pattern comprising a plurality of second touch electrodes on the second insulating layer.
The second touch electrodes and the first touch electrodes are arranged in a cross manner in the touch area, and the lead electrode and the photosensitive material block are located between two adjacent second touch electrodes (for example, as shown in fig. 3). In one possible implementation manner, the pattern including the plurality of first touch electrodes may be formed by a patterning process of a primary conductor material.
Step 106: and forming a third insulating layer covering the second insulating layer and the plurality of second touch electrodes.
In one possible implementation, the third insulating layer may be formed by a deposition or coating process of a primary insulating material (e.g., photoresist, silicon oxide, silicon nitride, etc.).
It can be understood that the thickness of the second insulating layer 16 and the thickness of the first touch electrode 11 in the process parameters determine the distance between the first touch electrode 11 and the second touch electrode 12. When a finger touches the touch surface provided by the third insulating layer 17, mutual capacitance touch sensing can be achieved by matching with an appropriate circuit structure connected by the first touch electrode 11 and the second touch electrode 12. In addition, an appropriate circuit structure connected between the first touch electrode 11 and the lead electrode can obtain the illumination intensity of the light of the corresponding waveband received by the photodiode by detecting the magnitude of the current flowing through the photodiode or the magnitude of the voltage on one electrode thereof, thereby realizing the surface sensitization of the touch panel.
It can be seen that, in the embodiment of the present invention, the first touch electrode multiplexed as one electrode of the photodiode may need to load a certain electrical signal when implementing both touch sensing and light sensing, and obviously, the first touch electrode cannot load two different electrical signals at the same time, so if the first touch electrode needs to load two different electrical signals at any time when implementing both the touch sensing function and the surface light sensing function, such a technical solution cannot be implemented. Therefore, the touch panel provided by the embodiment of the invention is suitable for a scene in which the touch sensing time period and the light sensing time period are not overlapped.
As an example of a touch sensing function and a surface sensing function that can be simultaneously realized, fig. 6 is a flowchart illustrating a driving method of the touch panel corresponding to the touch panel illustrated in fig. 4. Referring to fig. 6, the driving method includes:
step 201: applying a touch driving signal to the plurality of first touch electrodes for a first period of time of one driving cycle to receive a touch sensing signal at the plurality of second touch electrodes.
Step 202: applying a photosensitive driving signal to the first touch electrodes in a second time period of one driving cycle to receive a light sensing signal at the lead electrode layer;
wherein the first and second time periods are staggered from each other within the driving period. In one possible implementation, the total length of one driving cycle is 200ms (millisecond), the first 150ms portion of each driving cycle is the first time period, and the last 50ms portion of each driving cycle is the second time period.
Therefore, the driving method according to the embodiment of the present invention separates the time period for touch sensing from the time period for light sensing in the driving period, thereby effectively avoiding a situation where the first touch electrode is simultaneously loaded with two different electrical signals, i.e., confirming that any of the above-mentioned technical solutions of the touch panel in which the first touch electrode is multiplexed as one electrode of the photodiode has an implementation manner. Based on the application of the touch driving signal and the reception of the touch sensing signal in the first time period in each driving cycle, the touch sensing function of the touch panel can be realized by matching the settings of the first touch electrode and the second touch electrode; based on the application of the photosensitive driving signal and the reception of the light sensing signal in the first time period in the driving cycle, the light sensing function of the touch panel can be realized by matching with the arrangement of the photosensitive diode.
It can be seen that, based on the design that the first time period for applying the touch driving signal and receiving the touch sensing signal and the second time period for applying the photosensitive driving signal and receiving the light sensing signal are staggered with each other in the driving cycle, the driving method and the driving device of the touch panel according to the embodiments of the present invention can be used in conjunction with the structure of the touch panel shown in fig. 4 to multiplex the first touch electrode as one electrode of the photodiode while simultaneously achieving the touch sensing function and the light sensing function of the touch panel, thereby achieving the lightness and thinness of the photosensitive touch panel and meeting the use requirements of the touch panel in more application scenarios.
In particular, as shown in fig. 7, in a possible implementation of the touch panel shown in fig. 4, the application and reception of the signals can be implemented by the following structures inside the touch panel: the plurality of first touch electrodes 11 are respectively connected to a touch driving signal input terminal P1 outside the touch area a1 (for example, 8 first touch electrodes 11 in fig. 7 are respectively connected to one of 8 touch driving signal input terminals P1); the plurality of second touch electrodes 12 are respectively connected to a touch sensing signal output terminal P2 outside the touch area a1 (for example, in fig. 7, 9 second touch electrodes 12 are respectively connected to one of 9 touch sensing signal output terminals P2); the plurality of lead electrodes are respectively connected to a light sensing signal output terminal P3 outside the touch area a1 (for example, 8 lead electrodes in fig. 7 are respectively connected to one of 8 light sensing signal output terminals P3). Thus, in step 201, the touch driving signal is applied to the first touch electrodes 11 by inputting the touch driving signal to the touch driving signal input terminals P1 outside the touch area a 1; specifically, the touch sensing function is realized by collecting electrical signals output at a plurality of touch sensing signal output terminals P2 outside the touch area a1 to receive touch sensing signals. In the step 202, the photosensitive driving signal is applied to the first touch electrodes 11 by inputting the photosensitive driving signal to the touch driving signal input terminals P1 outside the touch area a1 (i.e. the touch driving signal input terminals P1 are multiplexed as photosensitive driving signal input terminals); specifically, the light sensing signal is received by collecting the electrical signals output by the plurality of light sensing signal output terminals P3 outside the touch area a 1. As an example, all the lead electrodes in the touch area are uniformly set to a first level at the beginning of a second time period, and the plurality of first touch electrodes 11 sequentially receive the second level in the second time period, so that during the period that any one of the first touch electrodes 11 receives the second level, the photodiode with the one of the first touch electrodes 11 as one electrode operates in an off state under the bias of the first level and the second level at both ends, but the photodiode receiving the light irradiation of the specific waveband generates a current to make the lead electrode connected with the photodiode start to rise or fall from the first level. Therefore, when the strip of first touch electrodes 11 no longer receives the second level, the voltages of all the lead electrodes at this time can be collected as the light sensing signals of all the photodiodes corresponding to the strip of first touch electrodes 11. It will be appreciated that the magnitude of the voltage on the lead electrodes deviating from the first level is representative of the intensity of light irradiated by the light of the characteristic wavelength band received by the corresponding photodiode. Therefore, when the second time period is over, the illumination intensity of the light of the specific wave band at the position of each photosensitive material block in the touch area can be obtained from the received light sensing signal, and accordingly, the surface sensitization of the touch panel is achieved.
It should be noted that, in the driving method of the touch panel, the step 201 may be performed by a step 203: applying a touch driving signal to the plurality of second touch electrodes during a first time period of a driving cycle to receive a touch sensing signal replacement at the plurality of first touch electrodes, so as to implement a touch sensing function of the touch panel in another manner (at this time, the plurality of first touch electrodes are respectively connected to a touch driving signal input end outside the touch area, and the plurality of second touch electrodes are respectively connected to a touch sensing signal output end outside the touch area); the above step 202 may be performed by a "step 204: and applying a photosensitive driving signal to the lead electrode layer in a second time period of one driving cycle to receive the light sensing signal' replacement at the first touch electrodes, so as to realize the surface photosensitive function of the touch panel in another way (at this time, the touch driving signal input end or the touch sensing signal output end connected with the first touch electrodes is multiplexed as a light sensing signal output end, and the lead electrodes are respectively connected with one photosensitive driving signal input end outside the touch area). It should be noted that the first touch electrode is prone to generate large voltage fluctuation during receiving the touch sensing signal, which may adversely affect the characteristics of the photosensitive material layer contacted by the first touch electrode, and therefore, it is still preferable to use the second touch electrode to receive the touch sensing signal. Moreover, since the sensing driving signal and the touch driving signal may have the same or similar waveforms in some implementations, the design of applying the sensing driving signal and the touch driving signal to the first touch electrode at different time periods is beneficial to simplifying the generation process of the sensing driving signal and the touch driving signal.
It is understood that, in any possible implementation manner of the provided touch panel, the number of the first touch electrodes, the number of the second touch electrodes, and the number of the lead electrodes may be set according to a required spatial resolution of touch sensing and a required spatial resolution of light sensing, and may reach an order of hundreds or thousands in practical applications. However, it can be seen that, in the implementation shown in fig. 7, each of the first touch electrodes 11 has to be connected to one touch driving signal input terminal P1 through one connection line, that is, the number of the connection lines and the touch driving signal input terminals used in practical applications may reach hundreds or thousands, which causes a great limitation to the reduction of the wiring space on the touch panel and the reduction of the number of ports of the connected chips.
In view of this problem, another possible implementation of the touch panel and the driving method thereof is provided. As shown in fig. 8, the touch panel provided includes, on the basis of the structures shown in fig. 3 and 4, a multi-stage shift register unit U1 (only 8 units are taken as an example in fig. 8) outside the touch area in addition to the touch driving signal input terminal P1 arranged outside the touch area; the OUTPUT terminal OUTPUT of each stage of the shift register unit U1 is connected to one of the touch driving signal input terminals P1 outside the touch area. In one specific example, each stage of the shift register unit U1 has an INPUT terminal INPUT, an OUTPUT terminal OUTPUT, a RESET terminal RESET, a first clock signal terminal CLK1, and a second clock signal terminal CLK 2; the INPUT terminal INPUT of any stage of the shift register unit U1 except the first stage is connected to the OUTPUT terminal OUTPUT of the shift register unit U1 of the previous stage, and the RESET terminal RESET of any stage of the shift register unit U1 except the last stage is connected to the OUTPUT terminal OUTPUT of the shift register unit U1 of the next stage. Under the driving of the pair of the first clock signal CLK and the second clock signal CLKB, which are respectively connected to the first clock signal terminal CLK1 and the second clock signal terminal CLK2 and are opposite-phase signals, each stage of the shift register unit U1 may start outputting the second level at the OUTPUT terminal OUTPUT after a half clock cycle after the INPUT terminal INPUT is changed to the second level, and may stop outputting the second level at the OUTPUT terminal OUTPUT after a half clock cycle after the RESET terminal RESET is changed to the second level. Therefore, the touch driving signals can be provided to the plurality of first touch electrodes 11 in the first time period only by providing the start signal STV at the INPUT terminal INPUT of the first stage shift register unit U1, the signal at the RESET terminal RESET of the last stage shift register unit U1, and the first clock signal CLK and the second clock signal CLKB, and the second level can be provided to the plurality of first touch electrodes 11 in sequence in the second time period. Compared with the implementation mode shown in fig. 7, the number of the used connecting lines and the number of the touch driving signal input ends can be greatly reduced on the basis of keeping the original functions, which is beneficial to reducing the wiring space on the touch panel and the number of the ports of the connected chips.
It can be understood that, in any possible implementation manner of the touch panel provided by the present invention, based on the design that the touch panel includes multiple stages of shift register units located outside the touch region, and the output terminal of each stage of shift register unit is connected to one touch driving signal input terminal outside the touch region, the number of used connecting lines and touch driving signal input terminals can be greatly reduced on the basis of maintaining the original functions, which is beneficial to reducing the wiring space on the touch panel and the number of ports of the connected chips. Of course, in practical application, a person skilled in the art can select whether to adopt such a design according to practical requirements.
In addition, based on the structure of the touch substrate shown in fig. 3, there are other possible implementations in addition to the implementation corresponding to fig. 4. As shown in fig. 9, the touch panel of the embodiment of the invention includes a substrate 10, a plurality of second touch electrodes 12, a first insulating layer 15, a plurality of first touch electrodes 11, a photosensitive material layer 13, a second insulating layer 16, a lead electrode layer 14, and a third insulating layer 17. Thus, the touch surface (front surface of the touch panel) of the touch panel is provided by the upper surface of the second insulating layer 17 shown in fig. 9; the substrate 10 not shown in fig. 3 is located behind the plurality of second touch electrodes 12, and the third insulating layer 17 not shown in fig. 3 is located in front of the lead electrode layer 14. Specifically, referring to fig. 10, the touch substrate according to the embodiment of the present invention can be manufactured by the following processes:
step 301: a pattern including a plurality of second touch electrodes (for example, as shown in fig. 1) is formed on the substrate.
In one possible implementation manner, the pattern including the plurality of first touch electrodes may be formed by a patterning process of a primary conductor material.
Step 302: and forming a first insulating layer covering the upper surface of the substrate and the patterns of the plurality of second touch control electrodes.
In one possible implementation, the third insulating layer may be formed by a deposition or coating process of a primary insulating material (e.g., photoresist, silicon oxide, silicon nitride, etc.).
Step 303: and forming a pattern comprising a plurality of first touch electrodes on the first insulating layer.
The first touch electrodes and the second touch electrodes are arranged in a touch area of the touch panel in a crossed manner. In one possible implementation manner, the pattern including the plurality of first touch electrodes may be formed by a patterning process of a primary conductor material.
Step 304: and forming a pattern comprising a photosensitive material layer on the plurality of first touch electrodes, and forming a second insulating layer in an area except the pattern comprising the photosensitive material layer.
Wherein the photosensitive material layer includes a plurality of photosensitive material blocks separated from each other, and each of the photosensitive material blocks is located between two adjacent second touch electrodes (for example, as shown in fig. 2); the upper surface of the second insulating layer is flush or approximately flush with the upper surface of the photosensitive material layer. In a possible implementation manner, step 102 specifically includes: forming a first intrinsic semiconductor layer covering the plurality of first touch electrodes and the first insulating layer; performing ion implantation on the first intrinsic semiconductor layer by using the patterned photoresist as a mask to form a first doped region of the photosensitive material layer; forming a second intrinsic semiconductor layer covering the first intrinsic semiconductor layer; stripping the photoresist layer as a mask; performing ion implantation on the second intrinsic semiconductor layer by using the patterned photoresist as a mask to form a second doped region of the photosensitive material layer; the photoresist layer as a mask is stripped. Thus, the second insulating layer is formed of a non-conductive intrinsic semiconductor, and the upper surface of the second insulating layer can be made flush with the upper surface of the photosensitive material layer. In another possible implementation manner, step 102 specifically includes: forming a photoresist layer covering the plurality of first touch electrodes and the first insulating layer; removing the photoresist in the setting area of the photosensitive material layer through the processes of developing and exposing to form a groove with the bottom exposing the first touch electrode; the layer of photosensitive material is formed (e.g., by filling, printing, or the patterning process described above) within the recess such that the upper surface of the layer of photosensitive material is approximately even with the upper surface of the layer of photoresist. The formed photoresist layer thus forms the second insulating layer.
Step 305: forming a pattern including a lead electrode layer on the second insulating layer; wherein the lead electrode layer includes a plurality of lead electrodes separated from each other.
The lead electrodes are located between two adjacent second touch electrodes (as shown in fig. 4). In one possible implementation, the pattern including the lead electrode layer may be formed by a patterning process of a primary conductor material.
Step 306: and forming a third insulating layer covering the second insulating layer and the lead electrode layer.
In one possible implementation, the third insulating layer may be formed by a deposition or coating process of a primary insulating material (e.g., photoresist, silicon oxide, silicon nitride, etc.).
It can be understood that the thickness of the first insulating layer 15 and the thickness of the second touch electrode 12 in the process parameters determine the distance between the first touch electrode 11 and the second touch electrode 12. When a finger touches the touch surface provided by the third insulating layer 17, mutual capacitance touch sensing can be achieved by matching with an appropriate circuit structure connected by the first touch electrode 11 and the second touch electrode 12. In addition, an appropriate circuit structure connected between the first touch electrode 11 and the lead electrode can obtain the illumination intensity of the light of the corresponding waveband received by the photodiode by detecting the magnitude of the current flowing through the photodiode or the magnitude of the voltage on one electrode thereof, thereby realizing the surface sensitization of the touch panel.
However, as can be seen from comparing the cross-sectional structures of fig. 4 and fig. 9, since the photosensitive material layer 13 and the lead electrode layer 14 in fig. 4 are both located on the sides of the first touch electrode 11 and the second touch electrode 12 away from the touch surface, the influence of electromagnetic interference from the photosensitive material layer 13 and the lead electrode layer 14 during the implementation of touch sensing is relatively small. In any possible implementation manner of the touch panel provided by the invention, based on the design that the photosensitive material layer is located on the side of the first touch electrode away from the touch surface and the lead electrode layer is located on the side of the photosensitive material layer away from the touch surface, electromagnetic interference caused by capacitive touch between two touch electrodes by the lead electrode layer mainly formed by a conductor can be reduced, and the reliability of a product is improved. Of course, in practical application, a person skilled in the art can select whether to adopt such a design according to practical requirements.
On the other hand, there are other possible implementations of the specific structure of the photosensitive material layer besides the implementation shown in fig. 2, and there are other implementations of the specific structure of the lead electrode layer besides the implementation shown in fig. 3. As shown in fig. 11, the position of the cross section shown in fig. 11 with respect to the touch panel corresponds to the position of the cross section shown in fig. 4 with respect to the touch panel. Unlike the structure shown in fig. 4, in this example, the photosensitive material layer 13 and the lead electrode layer 14 are disposed on the whole surface (i.e., as a whole-surface and everywhere continuous layer structure occupying a certain thickness range of the touch panel), so that the first insulating layer 15 is omitted. Compared with the structure shown in fig. 4, the touch panel shown in fig. 11 simplifies the above steps 101 and 102 into forming a whole lead electrode layer and forming a whole photosensitive material layer (for example, depositing an N-type doped semiconductor layer and a P-type doped semiconductor layer in sequence), so that the touch panel can have a simpler manufacturing process; and the lead electrode layer arranged on the whole surface can shield electromagnetic interference on two sides, so that the reliability of the product is improved. However, compared with the touch substrate shown in fig. 11, the touch substrate shown in fig. 4 is likely to have higher light transmittance than both the photosensitive material layer 13 and the lead electrode layer 14, and thus can achieve higher light transmittance; moreover, since the lead electrode layer as a continuous structure of the whole surface can only apply or collect one kind of electric signal at any time, the limitation on the application of the photosensitive driving signal and the reception of the light sensing signal is relatively small in the touch substrate shown in fig. 4 compared with the touch substrate shown in fig. 11, and light sensing with higher spatial resolution can be realized. For example, when the photosensitive driving signal in the second time period is applied to the lead electrode layer (the lead electrode layer is connected to one photosensitive driving signal input end outside the touch area, and the touch driving signal input end or the touch sensing signal output end connected to the first touch electrode is multiplexed as the light sensing signal output end), each first touch electrode can receive the current generated by all the contacted photosensitive material layers under illumination, so that the light intensity distribution in the second direction can be obtained. When the photosensitive driving signal in the second time period is applied to the plurality of first touch electrode lines (the lead electrode layer is connected to one light sensing signal output end outside the touch area, and the touch driving signal input end or the touch sensing signal output end connected to the first touch electrode is multiplexed as the photosensitive driving signal input end), the sum of the light intensities received by all the photodiodes corresponding to each touch electrode can be obtained in a time-sharing manner, so that the light intensity distribution in the second direction can be obtained. In comparison, in the former method, the plurality of first touch electrodes can be used to simultaneously collect the electrical signals of all the photodiodes, so that the second time period and the driving period can be shortened more advantageously than in the latter method.
It can be understood that, in any possible implementation manner of the touch panel provided by the present invention, based on the design that the photosensitive material layer includes a plurality of photosensitive material blocks separated from each other, and the surface of the second side of each photosensitive material block and one first touch electrode are in contact with each other between two adjacent second touch electrodes, the light transmittance can be increased, and the mutual interference of the photodiodes at different positions can also be reduced. Of course, in practical application, a person skilled in the art can select whether to adopt such a design according to practical requirements.
It can be understood that, in any possible implementation manner of the touch panel provided by the present invention, based on the design that the lead electrode layer includes a plurality of lead electrodes separated from each other, and each lead electrode is in contact with the surface of the first side of the photosensitive material block located between two adjacent second touch electrodes, electromagnetic interference caused by capacitive touch between the two touch electrodes by the lead electrode layer mainly formed by a conductor can be reduced, and reliability of a product is improved. Of course, in practical application, a person skilled in the art can select whether to adopt such a design according to practical requirements.
In addition, fig. 12 is a schematic view illustrating an arrangement manner of touch electrodes in a touch panel according to another embodiment of the invention. As can be seen from comparing fig. 1 and 12, the portion of the straight-bar-shaped first touch electrode 11 shown in fig. 12 between two adjacent second touch electrodes 12 extends toward the second direction R2 and the opposite direction of the second direction R2, so as to form the first touch electrode 11 shown in fig. 1; as can be seen from fig. 2, the surface of the second side of the photosensitive material layer 13 and the expanded portion of the first touch electrode 11 between two adjacent second touch electrodes 12 are in contact with each other. It can be understood that the shape of the first touch electrode 11 shown in fig. 1 is more favorable for increasing the mutual capacitance between the first touch electrode and the second touch capacitor, and is also favorable for increasing the spatial range of the light sensed by each photodiode, compared with the shape of the first touch electrode 11 shown in fig. 12, so that better touch sensing and surface sensitization can be achieved. Of course, for the same purpose, the direction of the expansion may be the second direction R2 alone or the direction opposite to the second direction R2, besides the second direction R2 and the direction opposite to the second direction R2.
It can be understood that, in any possible implementation manner of the touch panel provided by the present invention, based on the design that the portion of the straight-bar-shaped first touch electrode between two adjacent second touch electrodes extends toward the opposite direction of the second direction and/or the second direction, so that the surface of the second side of the photosensitive material layer and the extended portion are in contact with each other, the mutual capacitance between the first touch electrode and the second touch capacitor can be increased, and the spatial range of light sensed by each photodiode can be increased, thereby achieving better touch sensing and surface light sensing. Of course, in practical application, a person skilled in the art can select whether to adopt such a design according to practical requirements.
Based on the same inventive concept, the invention also provides a manufacturing method of any one of the touch panels, which comprises the following steps:
a structure including a photosensitive material layer, a lead electrode layer, a plurality of first touch electrodes, and a plurality of second touch electrodes is formed on a substrate.
Specifically, the manufacturing process shown in fig. 5 and the manufacturing process shown in fig. 10 may be a specific implementation manner of this step, and the manufacturing process of the touch panel with other structures may be obtained by referring to the manufacturing processes described herein, which is not described herein again.
Based on the design that the first touch electrode is reused as one electrode of the photosensitive diode, the provided manufacturing method of the touch panel can save the setting space and the manufacturing process of one electrode of the photosensitive diode, and compared with the touch panel before the integration of the surface photosensitive function, the thickness of the photosensitive material layer and the lead electrode layer can be increased or even reduced, so that the light and thin photosensitive touch panel can be realized, and the use requirements of the touch panel under more application scenes are met.
Further, as a specific application example of integrating the surface sensing function into the touch panel, on the basis of any one of the above-described driving methods of the touch panel, the following steps are further included as shown in fig. 13:
step 401: and performing fingerprint identification according to the touch sensing signal.
Step 402: when the fingerprint of the human body is identified, whether the infrared characteristics of the finger of the organism are detected or not is judged according to the light sensing signal.
Step 403: when the infrared characteristic of the finger of the living organism is not detected, an alarm signal is generated that the source of the identified fingerprint is not a living organism.
The photosensitive diode is specifically an infrared photosensitive diode.
Specifically, when infrared light is irradiated from the back surface of the touch panel to the finger performing the touch action, the intensity of the infrared light reflected by the surface of the finger fluctuates up and down along with the heartbeat pulse. Therefore, the infrared characteristics of the finger of the organism can be set when the fluctuation range of the sensed infrared light exceeds a certain limit in a period of time, so that the situation that the source of the identified fingerprint is not the organism can be effectively detected when fingerprint identification is carried out, and the safety of the fingerprint identification is enhanced. Of course, according to the characteristics of infrared light reflection on the surface of a human finger, infrared characteristics of fingers of other types of living bodies may also be set, and the embodiment of the present invention is not limited thereto.
In correspondence to any one of the above-described driving methods of a touch panel, the present invention also provides a driving apparatus of any one of the above-described touch panels, referring to fig. 14, the driving apparatus including:
a first signal applying unit 31 for applying a touch driving signal to the plurality of first touch electrodes within a first time period of one driving cycle to receive the touch sensing signal at the plurality of second touch electrodes, or the first signal applying unit 31 for applying a touch driving signal to the plurality of second touch electrodes within a first time period of one driving cycle to receive the touch sensing signal at the plurality of first touch electrodes;
a second signal applying unit 32, configured to apply a photosensitive driving signal to the plurality of first touch electrodes in a second time period of one driving cycle to receive the light sensing signal at the lead electrode layer, or the second signal applying unit 31 is configured to apply a photosensitive driving signal to the lead electrode layer in the second time period of one driving cycle to receive the light sensing signal at the plurality of first touch electrodes;
wherein the first and second time periods are staggered from each other within the driving period.
Specifically, the specific optional operation modes of the first signal applying unit 31 and the second signal applying unit 32 have been given in the description of the driving method, and are not described herein again. It is understood that the application and reception of the signal indicate the connection relationship between the corresponding unit and the corresponding structure in the touch panel, and also indicate the circuit function implemented by the corresponding unit. In some possible implementations, the above-mentioned driving means may be implemented by, for example, a digital circuit or a microcomputer including a processor.
It can be seen that, based on the design that the first time period for applying the touch driving signal and receiving the touch sensing signal and the second time period for applying the photosensitive driving signal and receiving the light sensing signal are staggered with each other in the driving period, the driving method of the touch panel provided can be matched with any one of the touch panels to multiplex the first touch electrode as one electrode of the photodiode on the premise of simultaneously realizing the touch sensing function and the light sensing function of the touch panel, so that the light and thin of the photosensitive touch panel are realized, and the use requirements of the touch panel in more application scenes are met.
Corresponding to the flow of the driving method shown in fig. 13, in a possible implementation manner of the driving apparatus, the photodiode is specifically an infrared photodiode; the drive device further includes the following structure as shown in fig. 15:
an identifying unit 33 for performing fingerprint identification according to the touch sensing signal;
a determining unit 34, configured to determine whether an infrared feature of a finger of an organism is detected according to the light sensing signal when the fingerprint of the human body is identified by the identifying unit 33;
and a generating unit 35 configured to generate an alarm signal that the identified fingerprint is not derived from the living body when the judging unit 34 judges that the infrared feature of the finger of the living body is not detected.
It will be appreciated that the drive means of embodiments of the invention may be implemented by, for example, digital circuitry or a microcomputer containing a processor.
Specifically, when infrared light is irradiated from the back surface of the touch panel to the finger performing the touch action, the intensity of the infrared light reflected by the surface of the finger fluctuates up and down along with the heartbeat pulse. Therefore, the infrared characteristics of the finger of the organism can be set when the fluctuation range of the sensed infrared light exceeds a certain limit in a period of time, so that the situation that the source of the identified fingerprint is not the organism can be effectively detected when fingerprint identification is carried out, and the safety of the fingerprint identification is enhanced. Of course, according to the characteristics of infrared light reflection on the surface of a human finger, infrared characteristics of fingers of other types of living bodies may also be set, and the embodiment of the present invention is not limited thereto.
Based on the same inventive concept, an embodiment of the present invention further provides a display device including any one of the touch panels described above, where the display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. In a possible implementation manner, the display device includes a backlight source of infrared light to cooperate with the driving method or the driving device to achieve effective detection of the situation that the source of the identified fingerprint is not an organism.
Based on the design that the first touch electrode is reused as one electrode of the photosensitive diode, the provided display device can save the setting space and the manufacturing process of one electrode of the photosensitive diode, and compared with the original display device, the thickness of the photosensitive material layer and the lead electrode layer can be increased only or even reduced, so that the light and thin display device with the surface photosensitive function can be realized, and the display device can have richer and more colorful functional experience on the basis of the conventional display device.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A touch panel is characterized by comprising a photosensitive material layer, a lead electrode layer arranged on the surface of a first side of the photosensitive material layer, a plurality of first touch electrodes extending along a first direction, and a plurality of second touch electrodes extending along a second direction; wherein,
the touch panel is provided with a touch area, and the first touch electrodes and the second touch electrodes are arranged in the touch area in a crossed mode;
the part of the first touch electrode between two adjacent second touch electrodes is in contact with the surface of the second side of the photosensitive material layer;
the first touch electrode, the photosensitive material layer and the lead electrode layer form a photosensitive diode in a region where the first touch electrode and the photosensitive material layer are in mutual contact, and an anode electrode and a cathode electrode of the photosensitive diode are respectively one of the first touch electrode in contact with the photosensitive material layer and the lead electrode layer in contact with the photosensitive material layer.
2. The touch panel of claim 1, wherein the touch panel has a touch surface; the photosensitive material layer is positioned on one side of the first touch electrode, which is far away from the touch surface; the lead electrode layer is located on one side of the photosensitive material layer far away from the touch surface.
3. The touch panel according to claim 1 or 2, wherein the photosensitive material layer includes a plurality of photosensitive material blocks separated from each other, and a surface of a second side of each of the photosensitive material blocks and one of the first touch electrodes are in contact with each other between two adjacent second touch electrodes.
4. The touch panel according to claim 3, wherein the lead electrode layer includes a plurality of lead electrodes separated from each other, each of the lead electrodes being in contact with a surface of the first side of the block of photosensitive material located between two adjacent second touch electrodes.
5. The touch panel of claim 4, wherein the first touch electrodes are each connected to a touch driving signal input terminal outside the touch area; the second touch control electrodes are respectively connected with a touch control sensing signal output end outside the touch control area; the plurality of lead electrodes are respectively connected with a light sensing signal output end outside the touch area.
6. The touch panel according to claim 1 or 2, wherein the photosensitive material layer is provided over the entire surface; the lead electrode layer is arranged on the whole surface; the first touch control electrodes are respectively connected with a touch control sensing signal output end outside the touch control area; the second touch control electrodes are respectively connected with a touch control driving signal input end outside the touch control area; the lead electrode is connected with a light sensing signal output end outside the touch area.
7. The touch panel according to claim 1 or 2, wherein a portion of the first touch electrode in a straight strip shape between two adjacent second touch electrodes extends toward a direction opposite to the second direction and/or the second direction, so that a surface of the second side of the photosensitive material layer and the extended portion are in contact with each other.
8. The method for driving the touch panel according to any one of claims 1 to 7, comprising:
applying a touch driving signal to the plurality of first touch electrodes during a first time period of one driving cycle to receive a touch sensing signal at the plurality of second touch electrodes, or applying a touch driving signal to the plurality of second touch electrodes during a first time period of one driving cycle to receive a touch sensing signal at the plurality of first touch electrodes;
applying a photosensitive driving signal to the first touch electrodes in a second time period of one driving cycle to receive the light sensing signal at the lead electrode layer, or applying a photosensitive driving signal to the lead electrode layer in a second time period of one driving cycle to receive the light sensing signal at the first touch electrodes;
wherein the first and second time periods are staggered from each other within the driving period.
9. The driving method according to claim 8, wherein the photodiode is in particular an infrared photodiode; the driving method further includes:
fingerprint identification is carried out according to the touch sensing signal;
when the fingerprint of the human body is identified, judging whether the infrared characteristics of the finger of the organism are detected or not according to the light sensing signal;
when the infrared characteristic of the finger of the living organism is not detected, an alarm signal is generated that the source of the identified fingerprint is not a living organism.
10. The driving apparatus of the touch panel according to any one of claims 1 to 7, comprising:
a first signal applying unit for applying a touch driving signal to the plurality of first touch electrodes within a first time period of one driving cycle to receive a touch sensing signal at the plurality of second touch electrodes, or applying a touch driving signal to the plurality of second touch electrodes within a first time period of one driving cycle to receive a touch sensing signal at the plurality of first touch electrodes;
a second signal applying unit, configured to apply a photosensitive driving signal to the plurality of first touch electrodes in a second time period of one driving cycle to receive the light sensing signal at the lead electrode layer, or apply a photosensitive driving signal to the lead electrode layer in the second time period of one driving cycle to receive the light sensing signal at the plurality of first touch electrodes;
wherein the first and second time periods are staggered from each other within the driving period.
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| CN107346196B (en) * | 2017-06-08 | 2020-04-07 | 深圳信炜科技有限公司 | Capacitive sensing device and electronic equipment |
| CN108304096B (en) | 2018-03-15 | 2020-12-01 | 京东方科技集团股份有限公司 | Touch control assembly and preparation method thereof, touch control display device and method for preventing wet and mistaken touch |
| CN111103959B (en) * | 2019-12-20 | 2021-05-18 | 展讯通信（上海）有限公司 | Register resetting system and chip |
| CN113296625A (en) * | 2020-02-24 | 2021-08-24 | 高尔科技股份有限公司 | Double-sided photo-thermal reaction selection lock and manufacturing method thereof |
| CN111766974A (en) | 2020-06-12 | 2020-10-13 | 惠州市华星光电技术有限公司 | Touch panel and touch display device |
| CN112947787B (en) * | 2021-02-23 | 2024-09-06 | 北京京东方显示技术有限公司 | Touch panel, display device, display system and touch method |
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| CN103345338A (en) * | 2013-06-17 | 2013-10-09 | 合肥京东方光电科技有限公司 | Light touch screen and manufacturing method thereof |
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| CN102043538A (en) * | 2009-10-17 | 2011-05-04 | 比亚迪股份有限公司 | Light-induced touch screen and detection system thereof |
| CN201600673U (en) * | 2010-01-27 | 2010-10-06 | 比亚迪股份有限公司 | Photoinductive capacitive touch screen |
| CN103345338A (en) * | 2013-06-17 | 2013-10-09 | 合肥京东方光电科技有限公司 | Light touch screen and manufacturing method thereof |
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