CN113485048B

CN113485048B - Display panel, display terminal and display driving method

Info

Publication number: CN113485048B
Application number: CN202110872168.1A
Authority: CN
Inventors: 查宝
Original assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2023-10-31
Anticipated expiration: 2041-07-30
Also published as: CN113485048A

Abstract

The application relates to a display panel, a display terminal and a display driving method, wherein the display panel comprises at least one integrated module, and each integrated module comprises: a display unit including at least one first transistor; the light-operated sensing unit comprises at least one second transistor and at least one third transistor; the touch sensing unit comprises an induction electrode; the grid electrode of the first transistor and the grid electrode of the second transistor are electrically connected to the same scanning line, and the source electrode or the drain electrode of the second transistor is electrically connected to the sensing electrode. According to the application, the grid electrode of the first transistor in the display unit and the grid electrode of the second transistor in the light-control sensing unit are electrically connected to the same scanning line, and the source electrode or the drain electrode of the second transistor is electrically connected to the induction electrode in the touch sensing unit, so that crosstalk among the display unit, the light-control sensing unit and the touch sensing unit can be effectively reduced, and parasitic capacitance is reduced.

Description

Display panel, display terminal and display driving method

Technical Field

The present application relates to the field of display technologies, and in particular, to a display panel, a display terminal, and a display driving method.

Background

With the development of display technology, it is also a trend to integrate sensors into a display panel. The touch sensor and the light sensor adopted at present are attached to the outside of the display screen, so that the light efficiency of the display panel is reduced and the cost is increased. Therefore, the sensor is integrated in the display panel, so that the loss of light efficiency can be effectively improved and the rise of cost can be suppressed.

In the current liquid crystal display, touch control is mostly adopted, especially a small-sized mobile phone. Although touch integration in liquid crystal displays is of interest, simultaneous integration of touch and light control in large, medium and small sizes is still relatively small. With the development of large-size display technology and the wide application in various fields, integrating various sensors into a display panel is also a mainstream trend to be developed, especially a touch sensor and a light control sensor.

However, the light-operated sensor and the touch sensor are synchronously integrated in the display panel, parasitic capacitance exists between the electrode of the light-operated sensor and the touch electrode of the touch sensor, and mutual crosstalk of electric fields between the various sensors, the display electrode and the liquid crystal is a key element for restricting the application of the sensor integration, which is a problem to be solved urgently at present.

Disclosure of Invention

In view of this, the present application provides a display panel, a display terminal and a display driving method, which can effectively reduce crosstalk among a display unit, a photo-control sensing unit and a touch sensing unit, and reduce parasitic capacitance between the touch sensing unit and the photo-control sensing unit.

According to an aspect of the present application, there is provided a display panel including at least one integrated module, each of the integrated modules including: a display unit including at least one first transistor; the light-operated sensing unit comprises at least one second transistor and at least one third transistor; the touch sensing unit comprises an induction electrode; the grid electrode of the first transistor and the grid electrode of the second transistor are electrically connected to the same scanning line, and the source electrode or the drain electrode of the second transistor is electrically connected to the sensing electrode.

Further, the display panel is of a multilayer structure, and the multilayer structure of the display panel comprises a first substrate, a gate insulating layer, a first passivation layer, an organic flat layer, a second passivation layer, a third passivation layer, a fourth passivation layer, a liquid crystal layer and a second substrate which are sequentially stacked.

Further, a first metal layer is disposed in the gate insulating layer, and a gate of the first transistor, a gate of the second transistor, and a gate of the third transistor are disposed in the first metal layer.

Further, a semiconductor layer and a second metal layer are disposed in the first passivation layer, and a source and a drain of the first transistor, a source and a drain of the second transistor, and a source and a drain of the third transistor are disposed in the second metal layer.

Further, a first electrode layer is disposed in the fourth passivation layer, and a source or a drain of the first transistor is electrically connected to the first electrode layer through a first via hole.

Further, a third metal layer is arranged in the third passivation layer, a second electrode layer is arranged in the liquid crystal layer, and the third metal layer is electrically connected to the second electrode layer through a second via hole.

Further, the second electrode layer comprises a plurality of sub-regions, and each sub-region is provided with one sensing electrode.

Further, the display unit further includes a common electrode, and part or all of the second electrode layer is multiplexed as the common electrode of the display unit.

According to another aspect of the present application, there is provided a display terminal including a terminal body and the display panel connected to the terminal body.

According to another aspect of the present application, there is provided a display driving method for driving the display panel, the display driving method including: dividing the total working time of the display panel into a plurality of working periods, wherein each working period comprises a first working stage and a second working stage; in a first working stage, controlling the light-operated sensing unit and the display unit to work, wherein the touch sensing unit does not work; and in the second working stage, controlling the touch sensing unit to work, wherein the light-operated sensing unit and the display unit do not work.

By arranging the grid electrode of the first transistor in the display unit and the grid electrode of the second transistor in the light-control sensing unit to be electrically connected to the same scanning line and arranging the source electrode or the drain electrode of the second transistor to be electrically connected to the sensing electrode in the touch sensing unit, the display unit and the light-control sensing unit can be scanned in line synchronization according to aspects of the application, and the sensing electrode of the touch sensing unit and the electrode of the light-control sensing unit are multiplexed, so that crosstalk among the display unit, the light-control sensing unit and the touch sensing unit is effectively reduced, and parasitic capacitance between the touch sensing unit and the light-control sensing unit is reduced.

Drawings

The technical solution and other advantageous effects of the present application will be made apparent by the following detailed description of the specific embodiments of the present application with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the application.

Fig. 2 shows a schematic diagram of an equivalent circuit of a display panel according to an embodiment of the present application.

Fig. 3 is a schematic diagram of a touch sensing unit according to an embodiment of the application.

Fig. 4 shows a timing chart of display panel driving according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements or interaction relationship between the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

The following disclosure provides many different embodiments, or examples, for implementing different features of the application. In order to simplify the present disclosure, components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials. In some instances, well known methods, procedures, components, and circuits have not been described in detail so as not to obscure the present application.

The present application generally provides a display panel including a plurality of integrated modules, each of the integrated modules including: a display unit including at least one first transistor; the light-operated sensing unit comprises at least one second transistor and at least one third transistor; the touch sensing unit comprises an induction electrode; the grid electrode of the first transistor and the grid electrode of the second transistor are electrically connected to the same scanning line, and the source electrode or the drain electrode of the second transistor is electrically connected to the sensing electrode. The grid electrode of the first transistor and the grid electrode of the second transistor are electrically connected to the same scanning line, and the source electrode or the drain electrode of the second transistor in the light-control sensing unit is electrically connected to the sensing electrode in the touch sensing unit.

As shown in fig. 1, the display panel includes at least one integrated module, and each integrated module includes a display unit 11, a light-operated sensing unit 12, and a touch sensing unit 13. It should be noted that, all of the modules shown in fig. 1 may be one integrated module, and a plurality of integrated modules may be arranged in an array in the display panel. In addition, the display unit 11, the photo-control sensing unit 12, and the touch sensing unit 13 shown in fig. 1 are schematic, and specific structures of the display unit 11, the photo-control sensing unit 12, and the touch sensing unit 13 are not limited.

Further, referring to fig. 1, the display panel is a multi-layered structure including a first substrate 10, a gate insulating layer 20, a first passivation layer 30, an organic planarization layer 40, a second passivation layer 50, a third passivation layer 60, a fourth passivation layer 70, a liquid crystal layer 80, and a second substrate 90, which are sequentially stacked.

Further, the first substrate 10 may be a Glass substrate (also referred to as TFT-Glass) for supporting a thin film transistor (Thin Film Transistor, TFT). A substrate layer (not shown) may be further provided on a surface of the first substrate 10 on a side opposite to the second substrate 90.

Further, the second substrate 90 may be a Glass substrate (also referred to as CF-Glass) for supporting a Color Filter (CF). The color filter may include a red color group unit, a green color group unit, and a blue color group unit, which are respectively used for filtering light rays of different wave bands, thereby realizing color liquid crystal display. For example, in fig. 1, a red color set unit 183 may be provided on a surface of the second substrate 90 on a side opposite to the first substrate 10. In addition, a plurality of black units 182 may be disposed on a surface of the second substrate opposite to the first substrate, and the plurality of black units 182 may be arranged in an array form to form a black matrix for shielding light incident on a partial region.

Further, liquid Crystal (LC) may be filled in the Liquid Crystal layer 80, that is, liquid Crystal may be filled between the fourth passivation layer and the second substrate. In fig. 1, the display unit 11, the photo-control sensing unit 12 and the touch sensing unit 13 are located below the liquid crystal layer 80.

Further, the display panel shown in fig. 1 may be disposed in a liquid crystal Cell of a liquid crystal display, and the space sandwiched between the first substrate 10 and the second substrate 90 may be one space unit (i.e., cell). Since a major portion of the display panel is located within the Cell, the display panel adopts an In-Cell mode.

According to the embodiment of the application, the display panel is arranged In the In-Cell mode, so that the display panel can be thinner and lower In cost compared with an On-Glass mode In which a circuit is manufactured and arranged outside Glass In the related art.

Further, the liquid crystal display may be a COA (Color-filter On Array) architecture or a Non-COA (Non-COA) architecture, and the display mode of the liquid crystal display may be a vertical alignment (Vertical Alignment, VA), an In-plane Switching (IPS), a Twisted Nematic (TN), an In-plane Switching (FFS), or the like. It will be appreciated by those skilled in the art that the present application is not limited to devices and structures other than display panels.

According to the embodiment of the application, the touch sensing unit is utilized to realize short-range touch control, and the light control sensing unit is utilized to realize long-range light control, so that the display panel integrates the functions of short-range touch control and long-range light control, the defect of single-function touch control or light control of the display panel is overcome, and the composite function of the liquid crystal display is improved.

As shown in fig. 2, the equivalent circuit of the display panel includes a light control sensing unit 21 and a display unit 22. The liquid crystal is easily affected by crosstalk of the light control sensing unit and the touch sensing unit, and the reading line in the light control sensing unit is easily affected by the sensing electrode in the touch sensing unit and the electrode in the display unit. It should be noted that fig. 2 shows a part of the display panel, and other parts of the display panel, such as a touch sensing unit, may be understood in conjunction with other related descriptions in the embodiments of the present application. In addition, for the sake of more clear description, the following will be described with reference to fig. 1 and 2 at the same time.

Further, the display unit 22 in fig. 2 is equivalent to the display unit 11 in fig. 1. Specifically, the gate 101 is equivalent to the gate of the transistor T3 (i.e., the first transistor), the source 103 is equivalent to the source of the transistor T3, and the drain 104 is equivalent to the drain of the transistor T3.

Further, the transistor T3 may be provided in plurality and arranged in an array form. A pixel electrode may be further provided in the vicinity of each transistor T3, and one transistor T3 and one pixel electrode may constitute one sub-pixel unit. For one sub-pixel unit, the capacitance between the pixel electrode and the liquid crystal may be equivalent to the liquid crystal capacitance C2. The scan line 23 can control the operation state of the transistor T3, so that the transistor T3 is turned on or off. When the transistor T3 is turned on, data on the data line 27 can be loaded on the liquid crystal capacitor C2, thereby realizing liquid crystal display. Since the capacitance of the lc capacitor C2 is small, the charge level is not sufficiently maintained, and thus a storage capacitor C3 is typically added to each pixel unit to make the lc display more stable.

It should be noted that the sub-pixel units may be arranged in an array, and the scan line 23 may be provided with a plurality of scan lines, where one scan line controls the working states of all transistors in a corresponding row of sub-pixel units; the data line 27 may be provided in plurality, and the drain of the transistor in one sub-pixel unit may be connected to one data line. By writing different data on the data line into different pixel units, liquid crystal display of different gray scales can be realized.

Further, the photo-sensing unit 21 in fig. 2 is equivalent to the photo-sensing unit 12 in fig. 1. Specifically, the gate 111 is equivalent to the gate of the transistor T2 (i.e., the second transistor); source 113 is equivalent to the source of transistor T2, the source of transistor T2 being electrically connected to read line 26; drain 114 is equivalent to the drain of transistor T2. As can be seen from fig. 1, in the vertical direction of the first substrate, the upper side of the transistor T2 is blocked by the black unit 182, and the transistor T2 can be used as a switch, so that the transistor T2 is also called a switching transistor.

Further, the gate 121 is equivalent to the gate of the transistor T1 (i.e., the third transistor); the source 123 is equivalent to the source of the transistor T1, and the source of the transistor T1 is electrically connected to the drain of the transistor T2; the drain 124 is equivalent to the drain of the transistor T1, and the drain of the transistor T1 is electrically connected to the second power line 25. As can be seen from fig. 1, the transistor T1 is not blocked by any component or black unit along the direction perpendicular to the first substrate, so that light can reach the channel of the transistor T1 to generate carriers, and thus the transistor T1 is also called a photo transistor.

Further, the capacitor C1 (not shown in fig. 1) may be a storage capacitor of the photo sensor unit, for storing carriers generated by the first transistor due to illumination. When the second transistor is in an on state, carriers stored in the capacitor C1 can be delivered onto the read line 26 through the second transistor, and thus detected by a processor external to the display panel.

Further, the first power line 24 and the second power line 25 may be set to a fixed voltage for providing the necessary operating voltage for the photo-controlled sensing unit. The voltage of the first power supply line 24 and the voltage of the second power supply line 25 may be respectively preconfigured.

Furthermore, the photo-control sensing unit may be further provided with three transistors, four transistors or a thin film transistor according to actual requirements, and the number of the transistors in the photo-control sensing unit is not limited in the application.

Further, the gate of the second transistor is electrically connected to the gate of the first transistor. By sharing the gate line of the first transistor for display and the gate line of the second transistor for photo-sensing, it is possible to realize the line-synchronous scanning of the display unit and the photo-sensing unit. Specifically, the gates of the first transistor and the second transistor may be scanned alternately in a time-sharing manner, that is, in a row-time-sharing scheme.

According to the embodiment of the disclosure, the display unit and the light-operated sensing unit are subjected to line synchronous scanning and are subjected to time-sharing alternating scanning, so that signal crosstalk between the display unit and the light-operated sensing unit can be effectively reduced.

Note that all the transistors in the embodiments of the present application may be Thin Film Transistors (TFTs). It will be appreciated by those skilled in the art that there are many different types of transistors, for example, transistors may be classified into N-type and P-type according to the channel of the transistor, and where different types of transistors are used, the positions of the source and drain of the transistor may be adjusted, and the application is not limited to the type of transistor.

Further, a first metal layer is disposed in the gate insulating layer, and the gate of the first transistor, the gate of the second transistor, and the gate of the third transistor are disposed in the first metal layer, that is, the gate of the first transistor, the gate of the second transistor, and the gate of the third transistor are disposed in the same layer. For example, the gate 101 of the first transistor, the gate 111 of the second transistor, and the gate 121 of the third transistor are all disposed in the first metal layer. The grid electrode of the first transistor, the grid electrode of the second transistor and the grid electrode of the third transistor are arranged on the same layer, so that the process flow of the display panel can be simplified, and meanwhile, the influence of parasitic capacitance between the touch sensing unit and the light control sensing unit is reduced.

Further, a semiconductor layer and a second metal layer are disposed in the first passivation layer, and a source and a drain of the first transistor, a source and a drain of the second transistor, and a source and a drain of the third transistor are disposed in the second metal layer. For example, the source 113 and the drain 114 of the second transistor are disposed in the second metal layer.

Further, a semiconductor layer is disposed in the first passivation layer 30. Taking fig. 1 as an example, the channel 102 of the first transistor, the channel 112 of the second transistor, and the channel 122 of the third transistor may all be provided in the semiconductor layer.

The material used for the channel 122 of the third transistor may be a photosensitive material, such as hydrogenated amorphous silicon (α -Si: H) or mixed doping of Ge and Si-Ge. Preferably, the material used for the channel 122 can be hydrogenated amorphous silicon (alpha-Si: H), and the alpha-Si: H material has high light absorptivity, large resistance temperature coefficient, controllable forbidden band width, large-area low-temperature film formation and simple production process. It should be noted that the same materials as the third transistor may be used for the channels of other transistors, such as the first transistor and the second transistor, and the materials used for the first transistor, the second transistor, and the third transistor are not limited in the present application.

The light sensing wave band of the third transistor can be 380-780 nm or 780-1000 nm, and 780-1000 nm is an infrared light wave band. When the light is stimulated, the alpha-Si-H in the third transistor can generate carriers, the carriers are collected through the storage capacitor C1, then the second transistor is used for control, and the carriers are processed through the amplifier and detected through the integrated circuit (Integrated Circuit, IC), so that the light-operated sensing function is realized.

Further, a first electrode layer is disposed in the fourth passivation layer, and a source or a drain of the first transistor is electrically connected to the first electrode layer through a first via hole. For example, referring to fig. 1, the source 103 of the first transistor may be connected to the first electrode layer 170. The first electrode layer 170 may be provided with an electrode made of Indium Tin Oxide (ITO). The first electrode layer is very close to the liquid crystal, and a plurality of capacitors can be equivalently arranged between the first electrode layer and the liquid crystal. By arranging the first electrode layer close to the liquid crystal layer, parasitic capacitance between the touch sensing unit and the light control sensing unit in the display panel can be reduced.

Further, a third metal layer is arranged in the third passivation layer, a second electrode layer is arranged in the liquid crystal layer, and the third metal layer is electrically connected to the second electrode layer through a second via hole. For example, referring to fig. 1, a third metal layer 160 may be disposed in the third passivation layer 60, and metal traces may be disposed in the third metal layer 160. The third metal layer 160 may be electrically connected to the second electrode layer 181 through a second via. In the second electrode layer, electrodes of different shapes may be etched. 180 may be any one of the electrodes of the second electrode layer. The second electrode layer may be made of ITO.

Further, the display unit further includes a common electrode, and part or all of the second electrode layer is multiplexed as the common electrode of the display unit. Referring to fig. 1, since a third metal layer is provided, a metal trace may be provided at the third metal layer, for example, the metal trace of the third metal layer may be electrically connected to the first via. In addition, the common electrode may be disposed at the position of the symbol 180, another electrode may be disposed at the position of the 170, and the electrode at the 170 and the electrode at the 180 may be equivalent to two plates of the capacitor in the display unit.

Further, the source or drain of the second transistor may be electrically connected to the third metal layer through a via (not shown in fig. 1). Because the source electrode or the drain electrode of the second transistor needs to be connected to the processor outside the display panel so as to control the working state of the second transistor by using the processor outside the display panel, in practical application, the second transistor can be electrically connected with the processor outside the display panel through the wiring of the third metal layer, so that signal interference can be reduced, and signal transmission quality is improved.

Compared with the scheme based on mutual capacitance In the related art, the embodiment of the application can realize higher scanning frequency and noise immunity and is more suitable for an In-Cell mode by adopting the self-capacitance-based touch sensing unit.

As shown in fig. 3, the touch sensing unit may be disposed over the entire display area, and the entire display area may have a rectangular shape, a length, and b width. It will be appreciated by those skilled in the art that the various components of the display panel may be located in different layers, and that the illustration of fig. 3 may be an orthographic projection of the display panel and the portions outside the display panel (e.g., the flexible flat cable) in the same horizontal plane.

Further, the second electrode layer comprises a plurality of sub-regions, and each sub-region is provided with one sensing electrode. The sensing electrode can generate a sensing signal after a finger touches and deliver the sensing signal to an external detection processor through the sensing wire, so that the touch position is judged. In addition, the second electrode layer can also be connected to the same voltage.

For example, in fig. 3, the second electrode layer may include m×n sub-regions 31, where m is the number of rows and n is the number of columns. The area of each sub-region 31 is a×b/m×n. One sensing electrode is provided in each sub-area 31. The sensing electrodes in each sub-area 31 may be electrically connected to a detection processor outside the display panel through sensing lines 32. Wherein, the two values of a/m and b/m can be set to be less than or equal to 7mm so as to ensure the accuracy of touch detection. Because each sub-area is provided with one sensing electrode, sensing can be independently performed, and the touch detection is performed in a point scanning mode in the embodiment of the application.

Because the sensing electrodes of the touch sensing units are arranged in the shared second electrode layer, when the touch sensing units are touched by a finger, the touch positions and the finger are capacitively coupled to form two poles of a capacitor (namely, a self-capacitor), which is equivalent to series connection of one capacitor, the capacitance can be increased, the capacitance variation of each touch sensing unit is electrically connected to the third metal layer through the second via hole and is electrically connected to an external processor of the display panel through the wiring of the third metal layer, so that the position of the capacitance variation is detected, and the coordinates of the touch point are positioned. Compared with the self-capacitance sensor in the related art, the self-capacitance touch sensing unit adopting the point scanning mode can solve the problem of ghost points (namely, the detected touch point coordinates are not unique).

Further, the light control sensing unit may be disposed corresponding to the sub-pixel unit. For example, the photo-control sensing unit may be disposed directly above or directly below the sub-pixel unit. The area of the light-operated sensing unit can be between 1/16 and 1 times of the area of the corresponding sub-pixel unit, namely, the area of the light-operated sensing unit can be 1/16 of the area of the corresponding sub-pixel unit or be equal to the area of the corresponding sub-pixel unit. In addition, the sensing wires in the light-operated sensing unit can also be detected by a processor led out of the display panel through the third metal layer.

According to the embodiment of the application, the third metal layer is arranged, and the common electrode for the display unit, the light-operated sensing unit and the touch sensing unit is arranged based on the third metal layer, so that parasitic capacitance can be reduced, and crosstalk among the display unit, the light-operated sensing unit and the touch sensing unit can be reduced.

The application also provides a display terminal, which comprises a terminal main body and the display panel, wherein the display panel is connected with the terminal main body. In one example, the display terminal may be a liquid crystal display.

The present application also provides a display driving method for driving the display panel, the display driving method comprising:

step S10, dividing the total working time of the display panel into a plurality of working periods, wherein each working period comprises a first working stage and a second working stage;

step S20, in a first working stage, the light-operated sensing unit and the display unit work, and the touch sensing unit does not work;

in step S30, in the second working stage, the touch sensing unit works, and neither the light control sensing unit nor the display unit works.

Wherein one of the duty cycles may also be referred to as a frame. By adopting a frame time-sharing scheme, the display driving method can respectively realize display and touch functions by utilizing the common electrode. In addition, by setting the light-operated sensing unit and the display unit to work in the same working stage and setting the light-operated sensing unit and the display unit and the touch sensing unit to work in different time periods, the embodiment of the application can solve the mutual crosstalk among the three, and keep simultaneous working and do not affect each other.

As shown in fig. 4, the display panel is driven based on frame time division, wherein Laser n represents an nth photo-control sensing unit, gate n represents an nth row scan line, and Tx n represents an nth row sensing electrode; t1 represents the first working phase and T2 represents the second working phase.

Further, in the first working stage, the light-operated sensing unit and the display unit work, and the touch sensing unit does not work. Specifically, in the first working stage, the plurality of scanning lines Gate 1-Gate n of the display unit may scan line by line, and the plurality of light-operated sensing units Laser 1-Laser n may work sequentially. In the second working phase, tx 1-Tx n can sequentially transmit touch signals to detect whether the position is touched. For example, the touch sensing unit may remain in a suspended state in the first working stage, i.e. suspend the operation, and after the light control sensing unit and the display unit complete the scanning in the first working stage, the scanning operation is started again. Wherein the total duration of one frame is equal to T1+T2, and the corresponding working frequency is 1/(T1+T2).

By adopting a line time-sharing scheme, the grid lines for display and the grid lines of the switch transistors in the light-operated sensing units are shared and alternately scanned according to time sequences, and a frame time-sharing scheme is adopted to separate the operation of the touch sensing units from the operation of the light-operated sensing units and the operation of the display units.

In summary, in the embodiment of the application, by setting the gate electrode of the first transistor in the display unit and the gate electrode of the second transistor in the light-operated sensing unit to be electrically connected to the same scanning line and setting the source electrode or the drain electrode of the second transistor to be electrically connected to the sensing electrode in the touch sensing unit, the display unit and the light-operated sensing unit can be scanned in line synchronization, and the sensing electrode of the touch sensing unit and the electrode of the light-operated sensing unit are multiplexed, so that crosstalk among the display unit, the light-operated sensing unit and the touch sensing unit is effectively reduced, parasitic capacitance between the touch sensing unit and the light-operated sensing unit is reduced, and the display device is particularly suitable for large-size liquid crystal display.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.

The display driving device, the display screen and the short-circuit prevention method provided by the embodiment of the application are described in detail, and specific examples are applied to explain the principle and the implementation mode of the application, and the description of the above embodiments is only used for helping to understand the technical scheme and the core idea of the application; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.

Claims

1. A display panel, the display panel comprising at least one integrated module, each integrated module comprising: a display unit including at least one first transistor; the light-operated sensing unit comprises at least one second transistor and at least one third transistor; the touch sensing unit based on self capacitance comprises an induction electrode; wherein the grid electrode of the first transistor and the grid electrode of the second transistor are electrically connected to the same scanning line, and the drain electrode of the second transistor is electrically connected to the source electrode of the third transistor;

the display panel is of a multilayer structure, and the multilayer structure of the display panel comprises a third passivation layer, a fourth passivation layer and a liquid crystal layer which are sequentially stacked;

a first electrode layer is arranged in the fourth passivation layer, and a source electrode or a drain electrode of the first transistor is electrically connected to the first electrode layer through a first via hole;

the liquid crystal display device comprises a liquid crystal layer, a first electrode layer and a second electrode layer, wherein the liquid crystal layer is provided with a plurality of subareas, and each subarea is provided with an induction electrode;

a third metal layer is arranged in the third passivation layer and is electrically connected to the second electrode layer through a second via hole; the second transistor is electrically connected with a processor outside the display panel through the wiring of the third metal layer.

2. The display panel according to claim 1, wherein the multi-layered structure of the display panel includes a first substrate, a gate insulating layer, a first passivation layer, an organic planarization layer, a second passivation layer, a third passivation layer, a fourth passivation layer, a liquid crystal layer, and a second substrate, which are sequentially stacked.

3. The display panel according to claim 2, wherein a first metal layer is provided in the gate insulating layer, and wherein a gate electrode of the first transistor, a gate electrode of the second transistor, and a gate electrode of the third transistor are provided in the first metal layer.

4. The display panel according to claim 2, wherein a semiconductor layer and a second metal layer are provided in the first passivation layer, and a source and a drain of the first transistor, a source and a drain of the second transistor, and a source and a drain of the third transistor are provided in the second metal layer.

5. The display panel according to claim 2, wherein the second electrode layer comprises a plurality of sub-regions, one sensing electrode being provided in each of the sub-regions.

6. The display panel according to claim 2, wherein the display unit further comprises a common electrode, and part or all of the second electrode layer is multiplexed as the common electrode of the display unit.

7. A display terminal comprising a terminal body and the display panel according to any one of claims 1 to 6, the display panel being connected to the terminal body.

8. A display driving method for driving the display panel according to any one of claims 1 to 6, comprising:

dividing the total working time of the display panel into a plurality of working periods, wherein each working period comprises a first working stage and a second working stage;

in a first working stage, controlling a plurality of light-operated sensing units to sequentially work and a plurality of scanning lines of the display unit to scan line by line, wherein the touch sensing units do not work;

and in the second working stage, controlling the touch sensing unit to work, wherein the light-operated sensing unit and the display unit do not work.