CN107704145B - Display panel, control method thereof and display device - Google Patents
Display panel, control method thereof and display device Download PDFInfo
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- CN107704145B CN107704145B CN201710905462.1A CN201710905462A CN107704145B CN 107704145 B CN107704145 B CN 107704145B CN 201710905462 A CN201710905462 A CN 201710905462A CN 107704145 B CN107704145 B CN 107704145B
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 37
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- 238000001514 detection method Methods 0.000 description 19
- 238000010586 diagram Methods 0.000 description 17
- 239000000758 substrate Substances 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 8
- 230000005284 excitation Effects 0.000 description 8
- 239000002184 metal Substances 0.000 description 7
- 239000004973 liquid crystal related substance Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
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Abstract
The invention discloses a display panel, a control method thereof and a display device. The display panel has a first region and a second region, and includes: a plurality of first touch electrodes disposed in the first region; a plurality of second touch electrodes disposed in the second area; the integrated circuit is electrically connected with the first touch electrode and the second touch electrode; a plurality of switching conversion circuits comprising: the first switch branch circuit is connected with the first touch electrode, the second switch branch circuit is connected with the common connecting end, wherein the first end is connected with the second touch electrode, and the second end is connected with the common connecting end; in the first time period, the first switch branch is connected, the second switch branch is disconnected, and in the second time period, the first switch branch is disconnected, and the second switch branch is connected. According to the invention, fingerprint identification can be realized on the display panel on the premise of not increasing chip pins in the integrated circuit.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel, a control method thereof and a display device.
Background
In recent years, with the gradual development of touch technologies, display panels of devices such as smart phones, smart tablets, smart wearable devices and the like generally have a touch function, and the touch panels can be classified into resistive type, capacitive type, optical type and acoustic wave type according to different sensing technologies, wherein the capacitive type touch panel determines a touch point by detecting a reference capacitance change caused by a sensing capacitance generated between an electrode and a human body. When the human body does not touch the touch panel, the state of each electrode is taken as a reference value. When a human body contacts the touch panel, a parasitic capacitance is generated between the human body and the touch panel, which causes a change in the total capacitance of the touch panel, and thus a change in the current or voltage in the touch panel. And detecting the voltage or current variation of the electrodes at different positions of the touch panel so as to calculate the contact position.
In the prior art, the touch display panel may adopt a self-capacitance touch technology or a mutual capacitance touch technology. In the self-capacitance touch technology, touch electrodes are arranged in an array and are respectively connected with an integrated circuit, an excitation signal sent by the integrated circuit is received, a detection signal is fed back to the integrated circuit, and each touch electrode is connected with one pin of a chip in the integrated circuit. In the mutual capacitance touch technology, the touch electrodes include transverse touch electrodes and longitudinal touch electrodes which are distributed in an orthogonal manner and are connected with the integrated circuit, wherein the transverse touch electrodes receive an excitation signal sent by the integrated circuit, the longitudinal touch electrodes feed back a detection signal to the integrated circuit, and each transverse touch electrode and each longitudinal touch electrode are also connected with one pin of a chip in the integrated circuit.
Generally, a display device including a touch display panel detects a touch operation of a user, such as a sliding operation and a clicking operation, according to the touch display panel to realize a corresponding control, and when a fingerprint touch is realized in the display device, a fingerprint touch module is usually required to be externally hung on the display panel, and the display panel includes an electrode used for fingerprint identification and a circuit used for fingerprint identification, so that fingerprint identification cannot be realized on the touch display panel. Fig. 1 is a schematic diagram of a touch display panel according to the prior art, and as shown in fig. 1, the touch display panel includes an array substrate 10 'and an integrated circuit 20' bound on the array substrate 10', where the array substrate 10' includes a substrate, and a thin film transistor, a pixel electrode and a common electrode disposed on the substrate, and the thin film transistor is used as a switch of a pixel to control an electric field between the pixel electrode and the common electrode, thereby controlling a deflection of liquid crystal molecules in the touch display panel. The touch display panel adopts a self-contained acelll structure, that is, in the display area AA, the common electrode is divided into a rectangular square array, and each rectangular square is reused as a touch electrode 11 'at the touch stage and is connected to the pin 21' of the integrated circuit 20 'through a touch trace 12'.
Although the touch electrode 11 'and the integrated circuit 20' have been provided for the touch display panel, a fingerprint touch module still needs to be added to implement fingerprint touch at present, and the inventor researches and discovers that the main reason why the existing touch electrode 11 'and the integrated circuit 20' cannot be reused to implement the fingerprint touch function is that: the contradiction between the fingerprint touch accuracy requirement of the touch electrode 11' and the limitation of the number of pins of the integrated circuit 20', that is, if the touch electrode 11' meeting the fingerprint touch accuracy requirement is arranged, the area of the touch electrode 11' in the display area AA is reduced, the number is inevitably increased, and correspondingly, the number of pins of the integrated circuit 20' is also increased; if appropriate pins of the integrated circuit 20' are set to meet the power consumption requirement of the integrated circuit 20' and the area requirement of the occupied frame, the number of the touch electrodes 11' in the display area AA is limited, the area is correspondingly limited, and the fingerprint touch accuracy requirement cannot be met.
Therefore, it is an urgent need in the art to provide a display panel, a control method thereof, and a display device, which can implement fingerprint identification on a touch display panel without increasing the number of integrated circuit pins.
Disclosure of Invention
In view of this, the present invention provides a display panel, a control method thereof and a display device, which solve the technical problem that fingerprint identification cannot be implemented on a touch display panel in the prior art.
In order to solve the above technical problem, the present invention provides a display panel.
The display panel has a first region and a second region, and includes: the plurality of first touch electrodes are arranged in the first area, wherein the first area is a display area of the display panel; a plurality of second touch electrodes disposed in the second region; an integrated circuit electrically connected to the first touch electrode and the second touch electrode; a plurality of switching conversion circuits, the switching conversion circuits comprising: the common connecting end is connected with the integrated circuit and a first switch branch circuit, wherein the first end of the first switch branch circuit is connected with the first touch electrode, the second end of the first switch branch circuit is connected with the common connecting end, and the first end of the second switch branch circuit is connected with the second touch electrode; in a first time period, the first switch branch is turned on, the second switch branch is turned off, and in a second time period, the first switch branch is turned off, and the second switch branch is turned on.
In order to solve the above technical problem, the present invention further provides a control method of a display panel.
The display panel has a first region and a second region, and includes: a plurality of first detection electrode touch electrodes disposed in the first region; a plurality of second detection electrode touch electrodes disposed in the second area; an integrated circuit electrically connected to the first detection electrode touch electrode and the second detection electrode touch electrode, the control method comprising: in a first time period, the integrated circuit and the first detection electrode touch electrode carry out signal transmission; and in a second time period, the integrated circuit and the second detection electrode touch electrode carry out signal transmission.
In order to solve the above technical problem, the present invention further provides a display device.
The display device comprises any one of the display panels provided by the invention.
Compared with the prior art, the display panel, the control method thereof and the display device of the invention have the following beneficial effects:
the display panel of the invention is provided with a first area and a second area, and touch electrodes which are mutually independent are arranged in different areas, so that the touch electrodes in different areas can be respectively provided with corresponding sizes and numbers without mutual influence according to the touch precision requirements of different areas, and the touch electrodes in different areas can multiplex the integrated circuit by a switch conversion circuit in a time-sharing way, thereby realizing the touch function in different areas in different time periods, namely, each area is not required to be provided with a respective touch module, and the touch electrodes in different areas can multiplex pins of the integrated circuit, thereby avoiding the problems of power consumption and occupied area of the integrated circuit caused by the increase of the pins, namely, for the display panel of the invention, if the fingerprint recognition is required to be realized, only the touch electrodes meeting the fingerprint recognition precision are arranged in the second area, and the switch conversion circuit and the touch electrode in the first area are used for multiplexing the integrated circuit, and pins of the integrated circuit are not required to be added.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic diagram of a touch display panel according to the prior art;
fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a display panel according to an embodiment of the invention;
FIG. 4 is a timing diagram illustrating a control of a display panel according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a single switch converting circuit of a display panel according to an embodiment of the present invention;
fig. 6 is a control timing diagram of a switch converting circuit of a display panel according to an embodiment of the present invention;
fig. 7 is a cross-sectional view of a display panel according to an embodiment of the present invention;
fig. 8 is a cross-sectional view of another display panel according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a plurality of switch converting circuits of a display panel according to an embodiment of the present invention;
fig. 10 is a flowchart illustrating a control method of a display panel according to an embodiment of the invention;
fig. 11 is a control timing chart of a control method of a display panel according to an embodiment of the invention;
FIG. 12 is a timing chart illustrating another control method for a display panel according to an embodiment of the present invention;
fig. 13 is a control timing diagram of another control method for a display panel according to an embodiment of the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
The present invention provides a display panel, a control method thereof and a display device, which can realize integration of a fingerprint touch function in the display panel without changing the size of a touch electrode in the existing touch display panel and increasing the number of integrated circuit pins.
Fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present invention, and fig. 3 is a schematic circuit connection diagram of a display panel according to an embodiment of the present invention. Referring to fig. 2, the display panel has a first area 10 and a second area 20, where the first area 10 and the second area 20 are two areas that do not overlap with each other on the display panel, and the first area 10 may be located on one side of the second area 20, or the first area 10 surrounds the second area 20, or other relative positions may also be adopted, which is not limited in the present invention.
The first area 10 is a display area AA of the display panel, and the second area 20 may be a non-display area, or may be another display area independent from the first area 10, for example, the first area 10 is a main screen portion of the display panel, and the second area 20 is an auxiliary screen portion of the display panel.
As shown in fig. 2 and 3, the display panel includes a plurality of first touch electrodes 11 disposed in the first area 10 and a plurality of second touch electrodes 21 disposed in the second area 20. The first touch electrode 11 can be a block electrode as shown in the figure, and the touch function is realized by a self-contained touch technology, and further, in an embodiment of the liquid crystal display panel, the first touch electrode 11 is reused as a common electrode in a display stage to form an electric field for deflecting liquid crystal molecules with the pixel electrode. Or, the first touch electrode may also be a strip electrode including a driving electrode and a receiving electrode, which are orthogonally arranged, and the touch function is realized by a mutual capacitance touch technology, specifically, the driving electrode and the receiving electrode may be prepared on the same layer, or on two layers. Accordingly, the second touch electrode 21 may be a block electrode or a stripe electrode similar to the first touch electrode 11.
In an embodiment, the second touch electrode 21 is configured as a block electrode with fingerprint touch function, and further, in an embodiment of the liquid crystal display panel, the second touch electrode 21 is also reused as a common electrode in the display stage.
With continued reference to fig. 2 and 3, the display panel further includes an integrated circuit 30 and a plurality of switch-over circuits 40. The integrated circuit 30 is electrically connected to the first touch electrode 11 and the second touch electrode 21, each switch conversion circuit 40 includes a common connection end 43 connected to the integrated circuit 30, the common connection end 43 is connected to one pin I/O of the integrated circuit 30, and the switch conversion circuit 40 further includes a first switch branch 41 and a second switch branch 42.
Specifically, in an embodiment, when the number of the first touch electrodes 11 is the same as that of the second touch electrodes 21, the number of the switch converting circuits 40 is the same as that of the first touch electrodes 11, and the number of the first touch electrodes 11 is the same as that of the second touch electrodes 21, the integrated circuit 30 is connected to one first touch electrode 11 and one second touch electrode 21 through one switch converting circuit 40, and different switch converting circuits 40 are connected to different first touch electrodes 11 and one second touch electrode 21, that is, the first ends of the first switch branches 41 of all the switch converting circuits are connected to the first touch electrode 11, the second ends of the first switch branches 41 are connected to the common connection end 43, the first ends of the second switch branches 42 are connected to the second touch electrodes 21, and the second ends of the second switch branches 42 are connected to the common connection end 43.
When the number of the first touch electrodes 11 is different from that of the second touch electrodes 21, in an embodiment, the number of the switch converting circuits 40 is the same as the number of more electrodes in the first touch electrodes 11 and the second touch electrodes 21, for a portion of the switch converting circuits 40, the integrated circuit 30 is connected to one of the first touch electrodes 11 and one of the second touch electrodes 21 via one of the switch converting circuits 40, for another portion of the switch converting circuits 40, the integrated circuit 30 is connected to one of the first touch electrodes 11 or one of the second touch electrodes 21 via one of the switch converting circuits 40, wherein, for a case where the integrated circuit 30 is connected to only one of the first touch electrodes 11 via one of the switch converting circuits 40, the first end of the first switch branch 41 is connected to the first touch electrode 11, the second end of the first switch branch 41 is connected to the common connection terminal 43, and the first end of the second switch branch 42 is suspended or connected to a fixed voltage, a second end of second switching leg 42 is connected to common connection 43; for the case that the integrated circuit 30 is connected to only one second touch electrode 21 via one switch conversion circuit 40, the first end of the first switch branch 41 is suspended or connected to a fixed voltage, the second end of the first switch branch 41 is connected to the common connection end 43, the first end of the second switch branch 42 is connected to the second touch electrode 21, and the second end of the second switch branch 42 is connected to the common connection end 43.
In this way, all the first touch electrodes 11 in the same area are connected to the integrated circuit 30 through the switch conversion circuit 40, or the second touch electrodes 21 in the same area are also connected to the integrated circuit 30 through the switch conversion circuit 40, so that the load difference between each touch electrode in the same area and the integrated circuit is reduced, and the touch control precision is improved. In an embodiment, when the first touch electrodes in the display area are reused as the common electrodes in the display stage, it is ensured that all the first touch electrodes 11 are connected to the integrated circuit 30 through the switch converting circuit 40, so that the display effect can be improved.
When the number of the first touch electrodes 11 is different from that of the second touch electrodes 21, in another embodiment, the number of the switch converting circuits 40 is the same as the number of the smaller electrodes of the first touch electrodes 11 and the second touch electrodes 21, for the same number of the first touch electrodes 11 and the second touch electrodes 21, the same number of the first touch electrodes 11 and the second touch electrodes 21 are connected to the integrated circuit 30 through the switch converting circuits 40, and for the redundant number of the first touch electrodes 11 or the second touch electrodes 21, the same number of the first touch electrodes 11 or the second touch electrodes 21 are directly connected to the integrated circuit 30.
In this way, fewer switch conversion circuits 40 are used, and the occupied area of components in the switch conversion circuits 40 on the display panel is reduced.
In an embodiment, fig. 4 is a control timing diagram of a display panel according to an embodiment of the present invention, as shown in fig. 4, in a touch phase, a control logic of the display panel has two different time periods, where in a first time period T1, the first switch branch 41 is controlled to be in an on state, the second switch branch 42 is controlled to be in an off state, and the integrated circuit 30 is controlled to be in an on state via the first switch branch 41 and the first touch electrode 11, so as to be capable of sending an excitation signal to the first touch electrode 11 and also capable of receiving a detection signal generated by the first touch electrode 11, so as to detect a touch operation of a user in the first area 10; in the second time period T2, the first switching branch 41 is controlled to be in the off state, the second switching branch 42 is controlled to be in the on state, and the integrated circuit 30 is connected to the second touch electrode 21 via the second switching branch 42, so as to be capable of sending an excitation signal to the second touch electrode 21 and also capable of receiving a detection signal generated by the second touch electrode 21, thereby realizing detection of a touch operation of a user in the second area 20.
By adopting the display panel provided by the invention, the area is additionally arranged outside the display area, and the touch electrodes which are mutually independent between the areas are arranged in the display area and the newly added area, so that the touch electrodes in different areas can be respectively set with corresponding sizes and numbers according to the touch precision requirements of different areas, and are not influenced mutually, for example, the touch electrodes with high touch precision are arranged in the newly added area to realize a fingerprint touch function, and are not influenced mutually with the touch electrodes in the display area. On the basis, the touch electrodes in different areas multiplex the integrated circuit in a time-sharing manner through the switch conversion circuit, so that the touch function in the unused area is realized in different time periods, namely, the touch module is not required to be arranged for each area, and the touch electrodes in the different areas can multiplex pins of the integrated circuit, so that the problems of power consumption and occupied area of the integrated circuit caused by the increase of the pins are solved.
Further, in an embodiment, the display panel includes a main screen and an auxiliary screen, the main screen and the auxiliary screen are respectively provided with touch electrodes, the main screen is used as a main display area, the touch electrode with a larger area is provided to implement a general touch function, the auxiliary screen is used as an auxiliary display area, the touch electrode with a smaller area and a higher precision is provided to implement a fingerprint touch function, that is, the second touch electrode is a fingerprint touch electrode. Specifically, with continued reference to fig. 2, the first area 10 is a display area of a main screen of the display panel, the second area 20 is a display area of an auxiliary screen of the display panel, in the first area 10, the first touch electrodes 11 are block electrodes, and the plurality of first touch electrodes 11 form an electrode array of N rows and M columns in the first area 10, in the second area 20, the second touch electrodes 21 are also block electrodes, and the plurality of second touch electrodes 21 form an electrode array of P rows and Q columns in the second area 20, wherein N, M, P and Q may be the same or different. The main screen realizes common touch functions of the display panel, such as sliding, dragging and other operations, through the first touch electrode 11, and in a display stage of the main screen, the first touch electrode 11 is multiplexed as a common electrode at the same time; the auxiliary screen realizes the fingerprint touch function of the display panel through the second touch electrode 21, for example, operations such as unlocking the main screen, and the like, and in the display stage of the auxiliary screen, the second touch electrode 21 is also reused as a common electrode. Optionally, N is equal to P, M is equal to Q, and the number of the first touch electrodes 11, the second touch electrodes 21, and the number of the switching circuits are all the same.
With continued reference to fig. 2 and 3, the main panel has a first non-display area BA, the integrated circuit 30 is disposed in the first non-display area BA, the first touch electrode 11 and the integrated circuit are connected via a first touch lead L1, the second touch electrode 21 and the integrated circuit are connected via a second touch lead L2 (only a portion of the second touch lead L2 is shown in the figure), wherein the first touch lead L1 extends along a first direction a, specifically, the pin I/O of the integrated circuit 30 is connected to the common connection terminal of the switching circuit, the first end of the first switching branch 41 is connected to the first touch electrode 11 via the first touch lead L1, the first end of the second switching branch 42 is connected to the second touch electrode 21 via the second touch lead L2, in the first direction, the first area 10, the first non-display area BA and the second area 20 are sequentially disposed, the first touch lead L1 extends from the first non-display area BA to the first area 10, the second touch lead L2 extends from the first non-display area BA to the second area 20, so that the first touch lead L1 and the second touch lead L2 have shorter trace lengths as a whole.
Further, in an embodiment, the first switching branch and the second switching branch are implemented by a switching tube, such as a thin film transistor, specifically, a plurality of switching tubes may be included in the first switching branch and the second switching branch, and the switching tubes cooperate with each other to implement the control logic of the first switching branch and the second switching branch, or the first switching branch and the second switching branch include one switching tube respectively. Specifically, fig. 5 is a schematic diagram of a single switch conversion circuit of a display panel according to an embodiment of the present invention, fig. 6 is a control timing diagram of the switch conversion circuit of the display panel according to the embodiment of the present invention, as shown in fig. 5, the first switch branch includes a first switch Tr1, wherein a first end S of the first switch Tr1 is connected to the first touch electrode 11, a second end D of the first switch Tr1 is connected to a common connection end, the common connection end is connected to a pin I/O of the integrated circuit, and a control end G of the first switch Tr1 receives a signal G1, wherein a timing of the signal G1 is as shown in fig. 6; the second switch branch includes a second switch tube Tr2, wherein the first end S of the second switch tube Tr2 is connected to the second touch electrode 21, the second end D of the second switch tube Tr2 is connected to the common connection end, and the control end G of the second switch tube Tr2 receives a signal G2, wherein the timing sequence of the signal G2 is as shown in fig. 6.
With appropriate reference to fig. 5 and 6, in one embodiment, for both the first switching tube Tr1 and the second switching tube Tr2 to be N-type thin film transistors, during the first time period T1, the control terminal G of the first switch tube Tr1 receives a high signal (i.e., a first signal), the control terminal G of the second switch tube Tr2 receives a low signal (i.e., a third signal), thus, a conduction path is formed between the first terminal S and the second terminal D of the first switching tube Tr1, and the first terminal S and the second terminal D of the second switching tube Tr2 are turned off, and at this time, the excitation signal generated by the integrated circuit can reach the first touch electrode 11 through the pin I/O and the first switch tube Tr1, and the detection signal of the first touch electrode 11 can also reach the integrated circuit through the first switch tube Tr1 and the pin I/O, so as to realize the detection of the touch operation of the first area of the display panel.
During the second time period T2, the control terminal G of the second switch tube Tr2 receives a high level signal (i.e., a fourth signal), and the control terminal G of the first switch tube Tr1 receives a low level signal (i.e., a second signal), so that a conducting channel is formed between the first terminal S and the second terminal D of the second switch tube Tr2, and the first terminal S and the second terminal D of the first switch tube Tr1 are turned off, at this time, the excitation signal generated by the integrated circuit can reach the second touch electrode 21 through the pin I/O and the second switch tube Tr2, and the detection signal of the second touch electrode 21 can also reach the integrated circuit through the second switch tube Tr2 and the pin I/O, thereby detecting the touch operation in the second area of the display panel.
By adopting the display panel provided by the embodiment, the time-sharing multiplexing of the touch electrodes in different areas on the integrated circuit is realized through the simple switch conversion circuit, the logic time sequence of the switch conversion circuit can be realized through only two control signals of each switch conversion circuit, and each switch conversion circuit comprises fewer electronic components, so that the complexity of the control time sequence and the complexity of the film structure of the display panel, which are caused by the increase of the switch conversion circuits, are reduced.
Further, in an embodiment, with reference to fig. 2 continuously, the integrated circuit 30 is disposed in a non-display area of the display panel, and at the same time, an orthographic projection of a first switch tube and a second switch tube in the switch conversion circuit on a first plane at least partially overlaps with an orthographic projection of the integrated circuit on the first plane, where the first plane is a plane parallel to a panel surface of the display panel, that is, in a thickness direction of the display panel, the first switch tube and the second switch tube are disposed at least partially overlapping with the integrated circuit, and preferably, both the first switch tube and the second switch tube are disposed fully overlapping with the integrated circuit, that is, the first switch tube and the second switch tube share the non-display area with the integrated circuit, without increasing the area of the non-display area additionally, which is beneficial for the display panel to form a narrow bezel and increase an effective display area.
In a specific embodiment, fig. 7 is a cross-sectional view of a display panel according to an embodiment of the present invention, and fig. 7 is a partial cross-section taken along a line B-B in fig. 2. the display panel includes an array substrate, as shown in fig. 7, the array substrate includes a glass substrate GS, a buffer layer BU, a gate insulating layer GI, a first metal layer provided with a gate G, an interlayer insulating layer ILD, a second metal layer provided with a source S and a drain D, a planarization layer PLN, and a third metal layer provided with a pad P of an integrated circuit 30. The first switch tube Tr1 and the second switch tube Tr2 in the switch conversion circuit are prepared in the same layer, the source S of the first switch tube Tr1 is connected to the first touch electrode through a touch signal line, the source S of the second switch tube Tr2 is connected to the second touch electrode through a touch signal line, the drain D of the first switch tube Tr1 and the drain D of the second switch tube Tr2 are connected to form a common connection terminal of the switch conversion circuit and are connected with a pad P of the integrated circuit, and the pad P of the integrated circuit 30 is welded with one pin of the integrated circuit.
In another specific embodiment, fig. 8 is a cross-sectional view of another display panel according to an embodiment of the present invention, and fig. 8 is a partial cross-section taken along a line B-B in fig. 2, where the display panel includes an array substrate, as shown in fig. 8, the array substrate including a glass substrate GS, a buffer layer BU, a light shielding layer LS, an active layer ASL, a gate insulating layer GI, a first metal layer providing a gate G of the second switching tube Tr2, a second metal layer providing a gate G of the first switching tube Tr1, an interlayer insulating layer ILD, a second metal layer providing a source S and a drain D of the first switching tube Tr1 and the second switching tube Tr2, a planarization layer PLN, and a third metal layer providing a pad P of an integrated circuit. The first switch tube Tr1 and the second switch tube Tr2 in the switch conversion circuit are prepared in a laminated mode, the first switch tube Tr1 adopts a top gate structure, the second switch tube Tr2 adopts a bottom gate structure, the source S of the first switch tube Tr1 is connected to a first touch electrode through a touch signal line, the source S of the second switch tube Tr2 is connected to a second touch electrode through a touch signal line, the drain D of the first switch tube Tr1 is connected with the drain D of the second switch tube Tr2 to form a common connection end of the switch conversion circuit and is connected with a pad P of the integrated circuit, and the pad P of the integrated circuit is welded with one pin of the integrated circuit.
With the display panel provided by the embodiment, the first switch tube Tr1 and the second switch tube Tr2 are stacked, so that the occupied area of the switch conversion circuit on the display panel is reduced, and the formation of a narrow frame of the display panel is facilitated.
Further, in an embodiment, the display panel includes a plurality of switch converting circuits, fig. 9 is a schematic diagram of the plurality of switch converting circuits of the display panel according to an embodiment of the present invention, and as shown in fig. 9, the display panel includes a plurality of switch converting circuits, the control terminals G of all the first switch tubes Tr1 in the plurality of switch converting circuits are connected to the first pin I/O of the integrated circuit 30, and the control terminals G of all the second switch tubes Tr2 in the plurality of switch converting circuits are connected to the second pin I/O' of the integrated circuit 30. The integrated circuit 30 transmits a signal G1 to the control terminals G of all the first switch tubes Tr1 through the first pin I/O ″, the first switch tubes Tr1 are in a turned-on state for a first time period, and the first switch tubes Tr1 communicate with the integrated circuit 30 through the pin I/O of the integrated circuit 30 for the first time period. The integrated circuit 30 transmits a signal G2 to the control terminals G of all the second switching tubes Tr2 through the second pin I/O', the second switching tubes Tr2 are in a conducting state for a second time period, and the second switching tubes communicate with the integrated circuit through different pins I/O of the integrated circuit for the second time period, wherein the first switching tube Tr1 and the second switching tube Tr2 belonging to the same respective switching conversion circuit communicate with the integrated circuit 30 through the same pin I/O of the integrated circuit 30.
By adopting the embodiment, the control ends of the first switch tubes in all the switch conversion circuits are driven and controlled by the same pin of the integrated circuit, and the control ends of the second switch tubes in all the switch conversion circuits are driven and controlled by the same pin of the integrated circuit, so that the control pins of the integrated circuit can be reduced.
The display panel provided by the embodiment of the invention also provides a display device, the display device comprises any one of the display panels, and the display device has the technical effects of any one of the display panels, and the description is omitted here.
The present invention further provides a control method of a display panel, referring to fig. 2, the display panel includes a plurality of first touch electrodes 11 disposed in a first area 10, a plurality of second touch electrodes 21 disposed in a second area 20, and an integrated circuit 30 electrically connected to the first touch electrodes 11 and the second touch electrodes 21, wherein the detailed description of the first area 10, the first touch electrodes 11, the second area 20, the second touch electrodes 21, and the integrated circuit 30 is as above, and is not repeated herein. Fig. 10 is a flowchart of a control method of a display panel according to an embodiment of the present invention, and as shown in fig. 10, the control method of the display panel according to the embodiment includes the following steps:
step 101: in a first time period, the integrated circuit and the first touch electrode transmit signals.
Step 102: and in a second time period, the integrated circuit and the second touch electrode carry out signal transmission.
Specifically, in an embodiment, the first touch electrode 11 is multiplexed as a common electrode in the display phase, and fig. 11 is a control timing diagram of a control method of a display panel according to an embodiment of the present invention, as shown in fig. 11, in the display phase T0, the first touch electrode 11 is multiplexed as a common electrode to receive a common voltage signal sent by an integrated circuit, and no signal is transmitted between the second touch electrode 21 and the integrated circuit. In a first time period T1 of the touch stage, the integrated circuit performs signal transmission with the first touch electrode 11, sends an excitation signal to the first touch electrode 11, and receives a detection signal of the first touch electrode 11, so as to implement touch detection on the position of the first touch electrode 11; in the second time period T2 of the touch stage, the integrated circuit performs signal transmission with the second touch electrode 21, sends an excitation signal to the second touch electrode 21, and receives a detection signal of the second touch electrode 21, so as to implement touch detection of the position of the second touch electrode 21.
By adopting the control method of the display panel provided by the invention, the display panel with different touch electrodes arranged in different areas can be controlled, the integrated circuit is subjected to time division multiplexing, and signal transmission is carried out with the touch electrodes in different areas in different time periods, so that the touch function in the unused area is realized, namely, no respective touch module is required to be arranged for each area, and the touch electrodes in different areas can multiplex pins of the integrated circuit, thereby avoiding the problems of power consumption and occupied area of the integrated circuit caused by the increase of the pins.
Further, in an embodiment, the integrated circuit firstly performs signal transmission with all the first touch electrodes in the first area, and then performs signal transmission with all the second touch electrodes in the second area, and a third time period may be set to include a plurality of first time periods, and in the third time period, the integrated circuit performs signal transmission with each of the first touch electrodes; specifically, as shown in fig. 12, a control timing chart of another control method of the display panel according to the embodiment of the present invention is shown in fig. 12, in the display period T0, the first touch electrode 11 is multiplexed as a common electrode to receive a common voltage signal sent by the integrated circuit, and no signal is transmitted between the second touch electrode 21 and the integrated circuit. In the touch phase, a touch cycle is divided into two parts, i.e., a third time period T3 and a fourth time period T4, the third time period T3 is divided into a plurality of first time periods T1, the integrated circuit performs signal transmission with one first touch electrode 11 in each first time period T1, the fourth time period T4 is divided into a plurality of second time periods T2, and the integrated circuit performs signal transmission with one second touch electrode 21 in each second time period T2.
By adopting the control method of the display panel provided by the embodiment, the control time sequence is simple.
Further, in another embodiment, the integrated circuit performs alternate signal transmission on the first touch electrodes in the first area and the second touch electrodes in the second area, specifically, a fifth time period may be set to include a first time period and a second time period, and in each fifth time period, the integrated circuit performs signal transmission with one first touch electrode in the first time period and then performs signal transmission with one second touch electrode in the second time period, and after a plurality of fifth time periods, the integrated circuit completes signal transmission between each first touch electrode and each second touch electrode, as shown in fig. 13, the control timing diagram of another control method of the display panel according to the embodiment of the present invention is shown in fig. 13, in the display period T0, the first touch electrode 11 is reused as a common electrode to receive a common voltage signal sent by the integrated circuit, no signal is transmitted between the second touch electrode 21 and the integrated circuit. In the touch phase, a touch period is divided into a plurality of fifth time periods T5, each of the fifth time periods T5 is divided into a first time period T1 and a second time period T2, and a signal is transmitted to one of the first touch electrodes 11 in each of the first time periods T1 and is transmitted to one of the second touch electrodes 21 in each of the second time periods T2.
By adopting the control method of the display panel provided by the embodiment, the touch detection in the first area and the second area is more real-time, and when the touch operation is simultaneously performed in the first area and the second area, the response to the touch operation is faster.
According to the embodiment, the anisotropic display panel and the display device provided by the invention have the following beneficial effects:
the touch electrodes which are mutually independent in the areas are arranged in the different areas of the display panel, so that the touch electrodes in the different areas can be respectively provided with corresponding sizes and numbers according to the touch precision requirements of the different areas, the touch electrodes in the different areas are not mutually influenced, the touch electrodes in the different areas can multiplex the integrated circuit through the switch conversion circuit in a time-sharing manner, and the touch function in the unused areas can be realized in different time periods, namely, the touch module is not required to be arranged for each area, and the touch electrodes in the different areas can multiplex pins of the integrated circuit, so that the problems of power consumption and occupied area of the integrated circuit caused by the increase of the pins are solved.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (16)
1. A display panel having a first region and a second region, the display panel comprising:
the plurality of first touch electrodes are arranged in the first area, wherein the first area is a display area of the display panel;
a plurality of second touch electrodes disposed in the second region;
an integrated circuit electrically connected to the first touch electrode and the second touch electrode;
a plurality of switching conversion circuits, the switching conversion circuits comprising:
a common connection terminal connected to the integrated circuit,
a first switch branch, wherein a first end of the first switch branch is connected to the first touch electrode, a second end of the first switch branch is connected to the common connection terminal,
a second switch branch, wherein a first end of the second switch branch is connected to the second touch electrode, and a second end of the second switch branch is connected to the common connection end;
the first switch branch comprises a first switch tube, and the second switch branch comprises a second switch tube;
the first switch tube and the second switch tube are both thin film transistors;
in a first time period, the first switch branch is turned on, the second switch branch is turned off, and in a second time period, the first switch branch is turned off, and the second switch branch is turned on.
2. The display panel according to claim 1,
a first end of the first switch tube is connected with the first touch electrode, a second end of the first switch tube is connected with the common connection end, a control end of the first switch tube receives a first signal in the first time period, and the control end of the first switch tube receives a second signal in the second time period, wherein the first signal is a signal for turning on the first switch tube, and the second signal is a signal for turning off the first switch tube;
the first end of the second switch tube is connected with the second touch electrode, the second end of the second switch tube is connected with the common connection end, the control end of the second switch tube receives a third signal in the first time period, and the control end of the second switch tube receives a fourth signal in the second time period, wherein the third signal is a signal for enabling the second switch tube to be turned off, and the fourth signal is a signal for enabling the second switch tube to be turned on.
3. The display panel according to claim 2,
the integrated circuit is arranged in a non-display area of the display panel;
the orthographic projection of the first switch tube and/or the second switch tube on a first plane is at least partially overlapped with the orthographic projection of the integrated circuit on the first plane, wherein the first plane is parallel to the plate surface of the display panel.
4. The display panel according to claim 2,
the control ends of all the first switch tubes in the switch conversion circuits are connected to a first pin of the integrated circuit;
the control ends of all the second switch tubes in the plurality of switch conversion circuits are connected to the second pin of the integrated circuit.
5. The display panel according to claim 2,
the first switch tube and the second switch tube are both N-type thin film transistors;
the first signal and the fourth signal are both high-level signals, and the second signal and the third signal are both low-level signals.
6. The display panel according to claim 1,
the first area is a display area of a main screen of the display panel;
the second area is a display area of an auxiliary screen of the display panel.
7. The display panel according to claim 6,
the main screen is provided with a first non-display area, and the integrated circuit is arranged in the first non-display area;
the first touch electrode is connected with the integrated circuit through a first touch lead, wherein the first touch lead extends along a first direction;
in the first direction, the first region, the first non-display region, and the second region are sequentially disposed.
8. The display panel according to claim 1,
the first touch control electrodes, the second touch control electrodes and the switch conversion circuits are the same in number, the first touch control electrodes connected with different switch conversion circuits are different, and the second touch control electrodes connected with different switch conversion circuits are also different.
9. The display panel according to claim 8,
the first touch electrodes form an electrode array with N rows and M columns in the first area;
the second touch electrodes form an electrode array with P rows and Q columns in the second area.
10. The display panel according to claim 9, wherein N ═ P and M ═ Q.
11. The display panel according to claim 9,
in a display stage of the display panel, the first touch electrode is reused as a common electrode in the first area.
12. The display panel according to claim 1,
the second touch electrode is a fingerprint touch electrode.
13. A display device characterized by comprising the display panel according to any one of claims 1 to 12.
14. The control method of a display panel according to claims 1 to 12, wherein the display panel has a first area and a second area,
the display panel includes:
a plurality of first touch electrodes disposed in the first region;
a plurality of second touch electrodes disposed in the second area;
an integrated circuit electrically connected to the first touch electrode and the second touch electrode, the control method comprising:
in a first time period, the integrated circuit and the first touch electrode carry out signal transmission;
and in a second time period, the integrated circuit and the second touch electrode carry out signal transmission.
15. The control method of a display panel according to claim 14,
the integrated circuit is connected with the first touch control electrodes in a first time period, and the integrated circuit is connected with the first touch control electrodes in a second time period;
the fourth time period includes a plurality of the second time periods, and the integrated circuit performs signal transmission with each of the second touch electrodes in the fourth time period.
16. The control method of a display panel according to claim 14,
a fifth time period including the first time period and the second time period, wherein the integrated circuit performs signal transmission with the first touch electrode and the second touch electrode in the fifth time period;
after a plurality of fifth time periods, the integrated circuit completes signal transmission between each first touch electrode and each second touch electrode.
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| CN108958537B (en) * | 2018-06-26 | 2021-02-19 | 联想(北京)有限公司 | Electronic equipment and manufacturing method thereof |
| CN111651084B (en) * | 2020-05-29 | 2024-02-06 | 维沃移动通信有限公司 | Touch display screen, electronic equipment and touch and fingerprint acquisition method |
| CN113190201B (en) * | 2021-05-17 | 2023-07-25 | 业成科技（成都）有限公司 | Spliced electronic device and driving method |
| CN114265524B (en) * | 2021-12-17 | 2023-08-22 | 武汉华星光电半导体显示技术有限公司 | Display panel |
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