CN112965314B

CN112965314B - Display panel and driving method thereof

Info

Publication number: CN112965314B
Application number: CN202110335228.6A
Authority: CN
Inventors: 苏子鹏
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2021-03-29
Filing date: 2021-03-29
Publication date: 2023-04-18
Anticipated expiration: 2041-03-29
Also published as: WO2022206535A1; CN112965314A

Abstract

The application discloses a display panel and a driving method thereof, and belongs to the technical field of display. The organic light emitting function layer and the second electrochromic layer are arranged at intervals of the region between at least part of the pixel defining parts, reversible color change reaction can occur under the action of an electric field on the first electrochromic layer and the second electrochromic layer, so that when the display panel is turned on, voltage is applied to the first electrode and the second electrode, the first electrochromic layer is subjected to color change adjustment, voltage is applied to the third electrode and the fourth electrode, the second electrochromic layer is subjected to color change adjustment, and the whole display panel is in a colorful state.

Description

Display panel and driving method thereof

Technical Field

The application belongs to the technical field of display, and particularly relates to a display panel and a driving method thereof.

Background

In the prior art, a display screen of an electronic device is generally in a monotonous black state when the display screen is in a screen-turning state.

Aiming at the problem that the display screen is too monotonous in display under the breath screen state, although colorful patterns can be presented in a display screen saver mode, the display screen is still in a working state when the display screen is kept, the power consumption of the display screen is certainly increased by the mode, the service life of the battery power is shortened, and further user experience is influenced.

Disclosure of Invention

The embodiment of the application aims to provide a display substrate, which can solve the problem that the existing display screen cannot display colors with low power consumption when not in use.

In order to solve the technical problem, the present application is implemented as follows:

in a first aspect, an embodiment of the present application provides a display panel, where the display panel includes a display substrate, where the display substrate includes a substrate and a pixel defining layer disposed on the substrate;

the pixel defining layer comprises a plurality of pixel defining parts arranged at intervals, and an organic light-emitting function layer and a second electrochromic layer are arranged at intervals in regions among at least part of the pixel defining parts;

each organic light-emitting functional layer is provided with a first electrode, a first electrochromic layer and a second electrode in a stacked mode; the first electrochromic layer can perform a color change reaction under the action of an electric field of the first electrode and the second electrode;

a third electrode is arranged on one side, facing the substrate, of each second electrochromic layer, and a fourth electrode is arranged on one side, far away from the first substrate, of each first electrochromic layer; the first electrochromic layer can generate a color change reaction under the action of an electric field of the third electrode and the fourth electrode.

In a second aspect, an embodiment of the present application provides a display panel driving method for driving the display panel as described above, wherein the driving method includes:

in a breath-screen state, applying a first voltage between the first electrode and the second electrode to change the first electrochromic layer from a transparent state to a first target color;

in the breath-screen state, a second voltage is applied between the third electrode and the fourth electrode to change the second electrochromic layer from a primary color to a second target color, wherein the primary color is black or gray.

In a third aspect, an embodiment of the present application provides an electronic device, which includes a processor, a memory, and a program or instructions stored on the memory and executable on the processor, and when executed by the processor, the program or instructions implement the steps of the method according to the first aspect.

In a fourth aspect, embodiments of the present application provide a readable storage medium, on which a program or instructions are stored, which when executed by a processor implement the steps of the method according to the first aspect.

In a fifth aspect, an embodiment of the present application provides a chip, where the chip includes a processor and a communication interface, where the communication interface is coupled to the processor, and the processor is configured to execute a program or instructions to implement the method according to the first aspect.

In an embodiment of the present application, a display panel includes a display substrate, the display substrate including a substrate and a pixel defining layer disposed on the substrate; the pixel defining layer comprises a plurality of pixel defining parts arranged at intervals, and an organic light-emitting function layer and a second electrochromic layer are arranged at intervals in at least partial areas among the pixel defining parts; each organic light-emitting functional layer is provided with a first electrode, a first electrochromic layer and a second electrode in a stacked mode; the first electrochromic layer can generate a color change reaction under the action of an electric field of the first electrode and the second electrode; a third electrode is arranged on one side, facing the substrate, of each second electrochromic layer, and a fourth electrode is arranged on one side, far away from the substrate, of each first electrochromic layer; the first electrochromic layer may undergo a color change reaction under the electric field of the third electrode and the fourth electrode. In the display panel, the organic light-emitting function layer and the second electrochromic layer are arranged in the region between at least part of the pixel boundary parts at intervals, and because the first electrochromic layer and the second electrochromic layer can perform reversible color change reaction under the action of an electric field, when the display panel is turned on, the first electrochromic layer is subjected to color change adjustment by applying voltage to the first electrode and the second electrode, and the second electrochromic layer is subjected to color change adjustment by applying voltage to the third electrode and the fourth electrode, so that the whole display panel is in a colorful state; in addition, because the electrochromic layer can not consume electric energy under the condition that the color is not changed, the power consumption of the colorful pattern presentation mode is far lower than that of the existing screen protection mode.

Drawings

Fig. 1 is a schematic overall structure diagram of a display panel provided in an embodiment of the present application;

FIG. 2 is an enlarged view of a portion A of FIG. 1;

FIG. 3 is a schematic sectional view taken along line B in FIG. 2;

FIG. 4 is a schematic view of a light transmission effect of a portion C of the under-screen camera of FIG. 1;

FIG. 5 is a schematic cross-sectional view taken along line D of FIG. 4;

FIG. 6 is a schematic view of a light transmission effect of the portion A in FIG. 1;

FIG. 7 is a schematic view of the color change effect of the sub-screen camera of FIG. 1 in a zone C;

fig. 8 is a schematic structural diagram of an electronic device provided in an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present disclosure.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or described herein. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

The display panel provided by the embodiment of the present application is described in detail through specific embodiments and application scenarios thereof with reference to the accompanying drawings.

Referring to fig. 1 to 3, the display panel 20 includes a display substrate 10, where the display substrate 10 includes a substrate 101 and a pixel defining layer 102 disposed on the substrate 101;

the pixel defining layer 102 includes a plurality of pixel defining portions 103 arranged at intervals, and an organic light emitting function layer 104 and a second electrochromic layer 108 are arranged at intervals in at least a part of regions between the pixel defining portions 103; a first electrode 105, a first electrochromic layer 106, and a second electrode 107 are stacked on each of the organic light emitting functional layers 104; the first electrochromic layer 106 undergoes a color change reaction under the action of an electric field between the first electrode 105 and the second electrode 107; a third electrode 109 is provided on a side of each of the second electrochromic layers 108 facing the substrate 101, and a fourth electrode 110 is provided on a side of each of the first electrochromic layers 106 facing away from the substrate 101; the first electrochromic layer 106 undergoes a color change reaction by an electric field between the third electrode 109 and the fourth electrode 110.

Since the pixel defining portions 103 are disposed over the pixel defining layers, and at least some of the pixel defining portions 103 are provided with the organic light emitting functional layer 104 and the second electrochromic layer 108 at intervals, only some of the pixel defining portions 103 may be provided with the organic light emitting functional layer 104 and the second electrochromic layer 108 at intervals, or all of the pixel defining portions 103 may be provided with the organic light emitting functional layer 104 and the second electrochromic layer 108 at intervals; the organic light emitting functional layer 104 is configured to emit light to present a corresponding color when the display panel needs to perform screen display, and the first electrochromic layer 106 is configured to perform a color changing reaction under an electric field between the first electrode 105 and the second electrode 107 to present a corresponding color in the breath-hold state, and convert into a transparent state under an electric field between the first electrode 105 and the second electrode 107 when the display panel needs to perform screen display; the second electrochromic layer 108 is used for performing a color change reaction under the action of an electric field between the third electrode 109 and the fourth electrode 110 in the breath screen state to present a corresponding target color, and when the display panel needs to perform image display, the second electrochromic layer is changed into black or gray under the action of the electric field between the third electrode 109 and the fourth electrode 110, so that the circuits such as the bottom electrode and the like are shielded, the color purity is enhanced, and the image display effect is improved.

In the display panel provided by the embodiment of the application, because the first electrochromic layer 106 and the second electrochromic layer 108 can perform a reversible color change reaction under the action of an electric field, when the display panel is turned off, the first electrochromic layer 106 is subjected to color change adjustment by applying voltages to the first electrode 105 and the second electrode 107, and the second electrochromic layer 108 is subjected to color change adjustment by applying voltages to the third electrode 109 and the fourth electrode 110, so that the entire display panel 20 can be in a colorful state by controlling the first electrochromic layer 106 and the second electrochromic layer 108 at different positions to perform different color changes; in addition, because the electrochromic layer can not consume electric energy under the condition that the color is not changed, the power consumption of the colorful pattern presentation mode is far lower than that of the existing screen protection mode.

In this embodiment, the display substrate 10 further includes a plurality of thin film transistors 112, and the plurality of thin film transistors 112 are located between the substrate 101 and the pixel defining layer 102; each organic light emitting function layer 104 is electrically connected to one of the thin film transistors 112, which is denoted as a first thin film transistor 112, through a corresponding seventh electrode 111, the first thin film transistor is used for applying a driving signal to the seventh electrode 111, and one side of each organic light emitting function layer 104, which is far away from the substrate 101, is in conduction with or in contact with the first electrode 105, and then one of the first electrode 105 and the seventh electrode 111 is used as an anode, and the other one of the first electrode 105 and the seventh electrode 111 is used as a cathode, and the switching function of the first thin film transistor is combined, so that the control of the light emission or the non-light emission of the sub-pixel unit corresponding to the corresponding organic light emitting function layer 104 can be realized. The organic light emitting function layer 104 is an OLED pixel subunit, and may specifically be a red pixel subunit, a green pixel subunit, or a blue pixel subunit.

Meanwhile, the voltage of the second electrode 107 is controlled by a control circuit, so that the effect of applying an electric field for performing a color change reaction on the first electrochromic layer 106 can be realized;

each of the second electrochromic layers 108 is electrically connected to one of the thin film transistors 112, which is referred to as a second thin film transistor, through the corresponding fourth electrode 110, and the second thin film transistor is configured to apply a driving signal to the third electrode 109; and one side of each of the second electroluminescent layers 104 away from the substrate 101 is electrically connected or in contact with the fourth electrode 110, and then one of the third electrode 109 and the fourth electrode 110 is used as an anode, and the other of the third electrode 109 and the fourth electrode 110 is used as a cathode, in combination with the switching action of the second thin film transistor, an electric field action for performing a color change reaction can be exerted on the second electrochromic layer 108.

Since each of the third electrodes 109 is electrically connected to one of the second thin film transistors, the color-changing reaction of each of the second electrochromic layers 108 can be independently controlled, and different color display requirements can be satisfied by selecting different electrochromic materials to fill the second electrochromic layers 108; specifically, three second electrochromic layers 108 capable of displaying red, green and blue colors in a variable manner are adjacently arranged to form a pixel unit, and because various colors can be combined by the three colors of red, green and blue, the required colors can be combined and displayed by controlling the color change reaction or the color change of the three second electrochromic layers 108 included in the pixel unit, and then the pattern display is performed with low power consumption after the display panel is screened, and the display of the screen pattern and the color appearance, such as a clock pattern, is displayed.

The cathode and the touch driving electrode may be made of one or more of silver Ag, copper Cu, magnesium Mg, aluminum Al, metal Mesh, metal oxide ITO, and indium tin oxide.

Specifically, the thin film transistor 112 includes a buffer layer 21, an IGZO (Indium Gallium Zinc Oxide) active layer 22, a gate insulating layer 23, a gate electrode 24, an interlayer dielectric layer 25, a source electrode (S electrode) 26 and a drain electrode (D electrode) 27 on the interlayer dielectric layer, and a planarization layer 28 covering the source electrode 26, the drain electrode (G electrode) 27, and the gate electrode 24, which are sequentially located on the substrate 101; the seventh electrode 111 is connected to the drain electrode 24 of the first thin film transistor, the third electrode 109 is connected to the drain electrode 94 of the second thin film transistor, and the fifth electrode is connected to the drain electrode 94 of the third thin film transistor.

The material of the active layer 22 may be Amorphous silicon (a-Si) of semiconductor a-Si, low Temperature Polysilicon (LTPS) of semiconductor, or Indium Gallium Zinc Oxide (IGZO) of metal oxide; the drain 27 may be made of Ti, al, mo, ag, mg, etc.; the buffer layer 21 and the planarization layer 298 may be made of resin-negative photoresist or the like; the interlayer dielectric layer 25 may be made of silicon nitride SiNx, silicon dioxide SiO2, silicon oxynitride SiNOx, or the like.

Alternatively, in one thin film transistor 112, a unit including N of the source electrode 26, the drain electrode 27, and the gate electrode 24 is included, and the drain electrode 27 of the previous unit is connected to the gate electrode 24 of the next unit, and the source electrode 26 of the first unit is connected to the anode of the control circuit, and the drain electrode 24 of the nth unit is connected to the third electrode 109. Wherein N is a positive integer, for example, 1, 2 or 9.

Alternatively, in one embodiment, the first electrode 105 is integrally disposed with the fourth electrode 110. Since the first electrode 105 and the fourth electrode 110 do not need to be connected to a control switch circuit, they can be disposed in the same layer, thereby simplifying the structure and facilitating the fabrication.

Alternatively, in an implementation manner, the display panel provided in the embodiment of the present application is applied to an electronic device having an under-screen camera, please refer to fig. 1 to 3 and fig. 4 to 5, where a portion of the regions between the pixel defining portions 103 are provided with the organic light-emitting functional layer 104 and the second electrochromic layer 108 at intervals, and the remaining regions between the pixel defining portions 103 are provided with the third electrochromic layer 113 at intervals, the under-screen camera corresponds to the region provided with the third electrochromic layer 113, the pixel defining layer region corresponding to the projection position of the under-screen camera is the region where the organic light-emitting functional layer 104 and the second electrochromic layer 108 are not provided, and only the third electrochromic layer 113 is provided; wherein, a fifth electrode 114 is disposed on a side of each of the third electrochromic layers 113 facing the substrate 101, and a sixth electrode 115 is disposed on a side of each of the third electrochromic layers 113 away from the substrate 101; the third electrochromic layer 113 undergoes a color change reaction by an electric field between the fifth electrode 114 and the sixth electrode 115.

Each of the fifth electrodes 114 is electrically connected to one thin film transistor 112, which is denoted as a third thin film transistor, and the third thin film transistor is configured to apply a driving signal to the fifth electrode 114, so as to control a voltage of the fifth electrode 114, that is, to implement an electric field effect of applying an electric field on the third electrochromic layer 113 to perform a color change reaction.

It should be particularly noted that the third electrochromic layer 113 is in a transparent state before electrochromic, or can be changed to be in a transparent state under the action of an electric field, so that when the off-screen camera needs to be used, the third thin film transistor controls the voltage applied between the fifth electrode 114 and the sixth electrode 115, so that the third electrochromic layer 113 is changed to be in a transparent state, and lighting of the off-screen camera is facilitated; meanwhile, when the display panel is turned off or needs to display, the third thin film transistor controls the voltage applied between the fifth electrode 114 and the sixth electrode 115, so that the third electrochromic layer 113 changes to a target color, and the display panel is controlled to display a desired pattern and color.

The fifth electrode 114 and the sixth electrode 115 are transparent electrodes to further reduce the light path shielding, and meet the requirement of the camera under the screen for light transmission.

In this embodiment, the light transmission effect of the projection position area of the under-screen camera is as shown in fig. 5, and the light transmission effect of the projection position area of the non-under-screen camera is as shown in fig. 6; the third electrochromic layer 113, the corresponding fifth electrode 114, the sixth electrode 115 and the third thin film transistor form an electrochromic sub-pixel unit, adjacent electrochromic sub-pixel units are separated by the pixel defining part 103, and the width of the pixel defining part 103 can be designed according to requirements. The density of the electrochromic sub-pixel unit can be twice that of the OLED pixel unit to improve the display effect, and certainly, the density of the electrochromic sub-pixel unit can be designed to be the same as that of the OLED, or three times, four times and the like according to requirements.

In this embodiment, since each of the fifth electrodes 114 is electrically connected to one of the third thin film transistors, the color-changing reaction of each of the third electrochromic layers 113 can be individually controlled, and different color display requirements can be satisfied by selecting different electrochromic materials to fill the third electrochromic layers 113; specifically, three third electrochromic layers 113 capable of displaying red, green and blue colors in a variable manner are adjacently arranged to form a pixel unit, and various colors can be combined by the three colors of red, green and blue, so that the required colors can be combined and displayed by controlling the color change reaction or no color change of the three second electrochromic layers 108 contained in the pixel unit, and further, screen pattern display is performed with low power consumption after the display panel is subjected to screen refreshing and normal display is performed, so that hole-free and full-screen display of the display panel is realized.

Optionally, in an embodiment, the remaining pixel defining units 103 include a pixel defining unit 103 located in the projection area of the off-screen camera and a pixel defining unit 103 located in the projection area of the fill-in light. In this embodiment, the projection area of the position of the light supplement lamp for supplementing light to the camera under the screen is also included in the area where the third electrochromic layer 113 is disposed, so that when the camera under the screen is used, the third electrochromic layer 113 corresponding to the projection area of the light supplement lamp is controlled to be in a transparent state, so that the light for supplementing light to take a picture for the camera under the screen passes through.

Alternatively, in an embodiment, when the off-screen camera is used in particular, the third electrochromic layer 113 at different positions may be changed to a transparent state or a black state under the action of different voltages applied between the fifth electrode 114 and the sixth electrode 115 according to the light intensity of the external environment, so as to implement an aperture design for accurately adjusting the light entering amount of the off-screen camera. For example, when light is too strong, the third electrochromic layer 113 in the peripheral region is controlled to change black to block light, and the third electrochromic layer 113 in the internal region is controlled to be in a transparent state to transmit light, so that the color change of the region provided with the third electrochromic layer 113 is realized, and thus a more appropriate light entering amount is obtained, and a photographing or image capturing effect is improved, wherein the color change effect of the region required by the light entering amount from large to small is as shown in fig. 7.

In the above embodiment, the pixel unit composed of the third electrochromic layer 113 in the area of the under-screen camera is controlled by the thin film transistor 112, and transparent or black display is performed according to different illumination intensity scene requirements, so as to form an aperture pattern, and a circular, square, irregular shape, etc. can be implemented without designing a pattern in advance.

In the embodiment of the present invention, the first electrochromic layer 106 is covered with the second electrode 107, the second electrochromic layer 108 is covered with the fourth electrode 110, the third electrochromic layer 113 is covered with the sixth electrode 115, and the second electrode 107, the fourth electrode 110, the sixth electrode 115, and the pixel defining portion 103 are sequentially stacked with the thin film encapsulation layer 116 and the polyimide thin film layer 117, thereby realizing encapsulation of each light-emitting sub-pixel unit such as the organic light-emitting functional layer 104, the first electrochromic layer 106, and the second electrochromic layer 108.

Since the first electrode 105 is an intrinsic electrode structure of the conventional display substrate 10, and since the first electrode 105 is not required to supply power to the display screen of the display panel 20 when the display panel 20 is in the information state, and the second electrode 107 is an electrode separately provided to provide an electric field effect for the color change reaction of the first electrochromic layer 106, the realization of the color change adjustment of the electrochromic layer 106 does not affect the original display function of the display panel 20.

In the embodiment, the first electrochromic layer 106, the second electrochromic layer 108, and the third electrochromic layer 113 have similar structures. The second electrochromic layer 108 is further explained as an example.

In the embodiment of the present invention, each of the first electrochromic layer 106, the second electrochromic layer 108, and the third electrochromic layer 113 includes an electrochromic material sublayer 81, an ion conductive sublayer 82, and an ion storage sublayer 83, which are sequentially stacked. The ion conducting sublayer 82 is located between the electrochromic material sublayer 81 and the ion storage sublayer 83, and the ion conducting sublayer 82 is in direct contact with both the electrochromic material sublayer 81 and the ion storage sublayer 83.

The optical properties of the material of the electrochromic material layer 81, such as reflectivity, transmittance, and absorption rate, are stable and reversible color change under the action of an external electric field, and may be an inorganic electrochromic material or an organic electrochromic material. Optionally, the material of the electrochromic material sublayer 81 may specifically be one or more of polypyrrole electrochromic materials, polythiophene electrochromic materials, polyfuran electrochromic materials, and polybenzazole electrochromic materials. Polyaniline can be formed by electrochemical processes or chemical oxidation of aniline; polyaniline may appear pale yellow or dark green/black in different oxidation states.

The ion-conducting sublayer 82 allows ions to move between the electrochromic sublayer 81 and the ion-storing sublayer 83, but prevents electrons from passing through, i.e., the ion-conducting sublayer 82 conducts ions but does not conduct electrons, and may be in a solid, liquid or colloidal state.

The ion storage sublayer 83 is operative to store ions and supply ions during the color change process, thereby balancing the total amount of charge. The ion storage sublayer 83 may also use an electrochromic material with properties opposite to those of the electrochromic material sublayer 81, and may play a role in ion complementation during the color changing process.

Alternatively, in one embodiment, the electrochromic material sublayer 81 in the second electrochromic layer 108 is electrically connected 105 to the third electrode 109, and the ion storage sublayer 83 in the second electrochromic layer 108 is electrically connected 110 to the fourth electrode. In this embodiment, the electrochromic material sublayer 81 is in contact with the third electrode 109, and the ion storage sublayer 83 is in contact with the fourth electrode 110, so that when the electrochromic layer 106 performs the color change adjustment, the color change reaction is performed on the side close to the third electrode 109.

Alternatively, in another embodiment, the ion storage sublayer 83 in the second electrochromic layer 108 is electrically connected to the third electrode 109, and the electrochromic material sublayer 81 in the second electrochromic layer 108 is electrically connected to the fourth electrode 110. In this embodiment, the electrochromic material sublayer 81 is in contact with the fourth electrode 110, and the ion storage sublayer 83 is in contact with the third electrode 109, so that when the second electrochromic layer 108 performs color change adjustment, a color change reaction is performed on the side away from the fourth electrode 110.

Alternatively, for the second electrochromic layer 108, it comprises a sub-layer 81 of the above described electrochromic material which is black or grey before electrochromic. The electrochromic material sub-layer 81 in the embodiment of the present application is black or gray before electrochromic, so that when the display panel 20 including the display substrate 10 is powered on for displaying, the second electrochromic layer 108 in black or gray is used to shield the projection area of the second electrochromic layer 108, thereby prompting the screen display effect.

Optionally, for the first electrochromic layer 106 and the third electrochromic layer 113, the included electrochromic material sub-layer 81 is in a transparent state before electrochromic, so that when the display panel 20 performs power-on display, the first electrochromic layer 106 does not block the display of the organic light-emitting functional layer 104, and when an off-screen camera needs to be used, a light stop for the off-screen camera is formed by the third electrochromic layer 113.

Optionally, as shown in fig. 3 or 4, the display panel 20 further includes a cover 118 and a touch layer 119; the cover 118, the touch layer 119, and the display substrate 10 are sequentially stacked, and the cover 118 and the touch layer 119 are bonded by an optically transparent adhesive 120. When the display panel 20 is in the display state, the second electrochromic layer 108 is in a dark color state such as black or gray, and can block light to circuits such as the thin film transistor 112 below, so that the polarizer in the existing display panel such as a micro light emitting diode display panel or a quantum dot display panel can be eliminated, the display effect of the display panel is not affected, and the whole display panel is thinner.

In the display panel 20 provided in the embodiment of the present disclosure, the touch layer 119 includes a touch driving electrode and a touch sensing electrode, the touch driving electrode is located on a side of the touch layer 119 facing the substrate 101, and the touch sensing electrode is located on a side of the touch layer 119 away from the substrate 101; when touch occurs, the distance between the touch driving electrode and the touch sensing electrode near the touch point changes, so that capacitive coupling between the touch driving electrode and the touch sensing electrode is influenced to generate a sensing signal, and the position of the touch point can be calculated.

The embodiment of the present application further provides a display panel driving method, which is applied to driving the display panel, where the method may include steps 100 to 200.

In the embodiment of the present application, the method is applied to an electronic device with an off-screen camera, where the electronic device may be a mobile electronic device such as a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a Personal Digital Assistant (PDA), or may also be a non-mobile electronic device such as a Personal Computer (PC), a Television (TV), a teller machine, or a self-service machine.

Step 100, in the breath-screen state, applying a first voltage between the first electrode and the second electrode to change the first electrochromic layer from the transparent state to a first target color.

In step 200, the first voltage is a color-changing voltage of the electrochromic material in the electrochromic layer. During normal display, in order to achieve normal light emitting display of the organic light emitting functional layer, the first electrochromic layer needs to be controlled to be in a transparent state, and in the breath screen state, the first electrode does not need to supply power to a display picture of the display panel, the first electrode can be used for providing an electric field effect for the color changing reaction of the first electrochromic layer, and a first voltage for enabling the first electrochromic layer to perform the color changing reaction is applied between the second electrode and the first electrode, so that the transparent state of the first electrochromic layer is changed into a target color state, and the whole display panel is enabled to be in a colorful state; in addition, because the first electrochromic layer can not consume electric energy under the condition that the color is not changed, the power consumption of the colorful pattern presentation mode is far lower than that of the existing screen saver mode.

Step 200, in the breath-screen state, applying a second voltage between the third electrode and the fourth electrode to change the second electrochromic layer from a primary color to a second target color, wherein the primary color is black or gray.

In step 200, the second voltage is a color-changing voltage of the electrochromic material in the second electrochromic layer. In the breath screen state, applying a second voltage which enables the second electrochromic layer to perform color change reaction between the third electrode and the fourth electrode to enable the second electrochromic layer to change from a black or gray primary color state to a target color state, so that the whole display panel is in a colorful state; in addition, because the electrochromic layer can not consume electric energy under the condition that the color is not changed, the power consumption of the colorful pattern presentation mode is far lower than that of the existing screen protection mode.

Alternatively, in an embodiment, in the case that the second electrochromic layer can be changed to a plurality of colors from the primary colors by the electric field with different intensities, the step 200 specifically includes steps 211 to 213:

step 211, determining a target color in a breath screen state;

step 212, determining a second voltage according to the corresponding relation between the target color and the voltage value;

step 213, applying the second voltage between the third electrode and the fourth electrode to change the electrochromic layer from a primary color to a second target color, wherein the primary color is black or gray.

In step 211, the second target color is a preset osd color, that is, when entering the osd state, a color preset by the user is obtained as the second target color.

In step 212, the correspondence relationship between the voltage value and the color determined in advance according to the electrochromic performance of the second electrochromic layer indicates that the second electrochromic layer is changed from the value to the target color to the required voltage value. Therefore, after the second target color is determined, the target voltage can be determined as the second voltage based on the correspondence.

In the step 113, a second voltage is applied between the third electrode and the fourth electrode, so that the second electrochromic layer located between the third electrode and the fourth electrode receives an electric field to perform a color change reaction, and changes to a second target color.

The above embodiment is applicable to a scene in which a single second electrochromic layer can change different colors through different electric field effects, and a corresponding second voltage is applied between the third electrode and the fourth electrode according to a corresponding relationship between a target color to be changed and a voltage value, that is, the second electrochromic layer can be changed to different color states.

Optionally, in an embodiment, the driving method further includes steps 300 to 400:

step 300, under the condition that a bright screen signal is received, continuously applying a third voltage for a preset time length between the first electrode and the second electrode so as to enable the first electrochromic layer to be restored to the transparent state from the first target color; the third voltage is equal to the first voltage in magnitude and opposite in direction.

In the step 300, when the bright screen signal is received, it indicates that the user needs to use the display panel, but because the first electrochromic layer is still in the first target color state, and the first target color is generally a color state, in order not to affect the normal display of the display panel, the first electrochromic layer needs to be restored to the primary color state of black or gray, so that a second voltage is continuously applied between the second electrode and the first electrode for a preset time period, and because the second voltage is equal to and opposite to the first voltage in magnitude, the electrochromic layer can be restored to the primary color state from the target color state. After the first electrochromic layer is restored to the transparent state, the first electrochromic layer does not affect the display of the display panel, so that the first electrode can be reused to supply power to all the organic light-emitting functional layers, the display panel enters a normal display state, and the problem that the display of the organic light-emitting functional layers is affected due to the fact that the electrochromic layer is changed to the colored state when the display panel normally displays is solved.

The electrochromic layer needs to continuously act on the electrochromic layer for a preset time length to complete the color change reaction under the color change voltage, so that when the first electrochromic layer is controlled to recover to the transparent state, the third voltage needs to be controlled for the first preset time length, and the first electrochromic layer can receive the electric field corresponding to the third voltage for the first preset time length to complete the color change reaction. The first preset time period is determined by the electrochromic material in the first electrochromic layer.

Step 400, in the case of receiving a bright screen signal, continuously applying a fourth voltage between the third electrode and the fourth electrode for a second preset time to restore the second electrochromic layer from the second target color to the primary color; the fourth voltage is equal to the second voltage in magnitude and opposite in direction.

In the step 400, when the bright screen signal is received, it is described that the user needs to use the display panel, but because the second electrochromic layer is still in the second target color state, and the second target color is generally in a color state, in order not to affect the normal display of the display panel, the second electrochromic layer needs to be restored to the primary color state of black or gray, so that a fourth voltage of a preset duration is continuously provided between the third electrode and the fourth electrode, because the fourth voltage is equal to the third voltage in magnitude and opposite to the third voltage in direction, the second electrochromic layer can be restored to the primary color state from the second target color state, and the problem that the display effect is affected by the second electrochromic layer changing to other colors except for black and gray when the display panel normally displays is avoided.

The electrochromic layer needs to be continuously acted under the color-changing voltage for a preset time period to complete the color-changing reaction, so that when the electrochromic layer is controlled to restore to the primary color, the fourth voltage needs to be controlled for a second preset time period, and the electrochromic layer can receive the electric field action corresponding to the fourth voltage for the second preset time period to complete the color-changing reaction. The second predetermined period of time is determined by the electrochromic material in the second electrochromic layer.

In the above embodiment, when the bright screen signal is received, the first electrochromic layer is controlled to return to the transparent state, the second electrochromic layer is controlled to return to the black or gray state, and then the organic light emitting functional layer is driven to enter the light emitting display state, so that the problem that the display effect of the display panel is affected due to the display color of the first electrochromic layer and the display of other colors except for black and gray by the second electrochromic layer when the display panel normally displays is solved.

Optionally, an embodiment of the present application further provides an electronic device, including the display panel, a processor, a memory, and a program or an instruction stored in the memory and executable on the processor, where the program or the instruction is executed by the processor to implement each process of the embodiment of the display panel driving method, and can achieve the same technical effect, and in order to avoid repetition, the details are not described here again.

It should be noted that the electronic devices in the embodiments of the present application include the mobile electronic devices and the non-mobile electronic devices described above.

Fig. 8 is a schematic diagram of a hardware structure of an electronic device implementing the embodiment of the present application.

The electronic device 800 includes, but is not limited to: a radio frequency unit 8001, a network block 8002, an audio output unit 8003, an input unit 8004, a sensor 8005, a display unit 8006, a user input unit 8007, an interface unit 8008, a memory 8009, and a processor 8010.

Those skilled in the art will appreciate that the electronic device 800 may further include a power source (e.g., a battery) for supplying power to the various components, and the power source may be logically connected to the processor 8010 via a power management system, so that the functions of managing charging, discharging, and power consumption may be implemented via the power management system. The electronic device structure shown in fig. 8 does not constitute a limitation of the electronic device, and the electronic device may include more or less components than those shown, or combine some components, or arrange different components, and thus, the description is omitted here.

The display panel 80061 included in the display unit 8006 includes the display substrate described above in this embodiment;

a processor 8010 configured to apply a first voltage between the first electrode and the second electrode in a breath-screen state to change the first electrochromic layer from a transparent state to a first target color; in the breath-screen state, a second voltage is applied between the third electrode and the fourth electrode to change the second electrochromic layer from a primary color to a second target color, wherein the primary color is black or gray.

In the electronic device provided by the embodiment of the application, in the breath screen state, the first electrochromic layer is subjected to color change adjustment by applying voltages to the first electrode and the second electrode, and the second electrochromic layer is subjected to color change adjustment by applying voltages to the third electrode and the fourth electrode, so that the whole display panel is in a colorful state; in addition, because the electrochromic layer can not consume electric energy under the condition that the color is not changed, the power consumption of the colorful pattern presentation mode is far lower than that of the existing screen protection mode.

Optionally, the processor 8010 is further configured to, in a case that a bright screen signal is received, continuously apply a third voltage between the first electrode and the second electrode for a first preset time duration, so that the first electrochromic layer is restored from the first target color to the transparent state; the third voltage is equal to the first voltage in magnitude and opposite in direction; continuously applying a fourth voltage between the third electrode and the fourth electrode for a second preset time under the condition of receiving a bright screen signal, so that the second electrochromic layer is restored to the primary color from the second target color; the fourth voltage is equal to the second voltage in magnitude and opposite in direction.

The embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or the instruction is executed by a processor, the program or the instruction implements each process of the above display panel driving method embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here.

The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and so on.

The embodiment of the present application further provides a chip, where the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to execute a program or an instruction to implement each process of the embodiment of the display panel driving method, and can achieve the same technical effect, and the details are not repeated here to avoid repetition.

It should be understood that the chips mentioned in the embodiments of the present application may also be referred to as a system-on-chip, or a system-on-chip.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present application.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The display panel is characterized by comprising a display substrate, wherein the display substrate comprises a substrate and a pixel defining layer arranged on the substrate;

each organic light-emitting functional layer is provided with a first electrode, a first electrochromic layer and a second electrode in a stacked mode; the first electrochromic layer generates a color change reaction under the action of an electric field of the first electrode and the second electrode;

a third electrode is arranged on one side, facing the substrate, of each second electrochromic layer, and a fourth electrode is arranged on one side, far away from the substrate, of each first electrochromic layer; the first electrochromic layer generates a color change reaction under the action of an electric field of the third electrode and the fourth electrode; the electrochromic material layer of the first electrochromic layer is in a transparent state before electrochromic; the electrochromic material layer of the second electrochromic layer is black or gray before electrochromic.

2. The display panel according to claim 1, wherein the second electrochromic layer comprises an electrochromic material layer, an ion conducting layer, and an ion storage layer, which are sequentially stacked.

3. The display panel according to claim 2, wherein the electrochromic material layer is electrically connected to the third electrode, and wherein the ion storage layer is electrically connected to the fourth electrode.

4. The display panel according to claim 2, wherein the ion storage layer is electrically connected to the third electrode, and wherein the electrochromic material layer is electrically connected to the fourth electrode.

5. The display panel according to claim 2, wherein the first electrode is provided integrally with the fourth electrode.

6. The display panel according to claim 2, wherein the electrochromic material layer is made of one or more of polyaniline, polypyrrole electrochromic material, polythiophene electrochromic material, polyfuran electrochromic material, and polybenzazole electrochromic material.

7. The display panel according to claim 1, wherein the display panel is applied to an electronic device having an off-screen camera, and wherein a portion of regions between the pixel defining portions are provided with an organic light emitting function layer and a second electrochromic layer at intervals, and remaining regions between the pixel defining portions are provided with a third electrochromic layer at intervals, and the off-screen camera corresponds to a region provided with the third electrochromic layer;

a fifth electrode is arranged on one side, facing the substrate, of each third electrochromic layer, and a sixth electrode is arranged on one side, far away from the substrate, of each third electrochromic layer; the third electrochromic layer generates a color change reaction under the action of the electric fields of the fifth electrode and the sixth electrode.

8. The display panel of claim 7, wherein the remaining pixel defining portions comprise a pixel defining portion located in a projection area of the under-screen camera and a pixel defining portion located in a projection area of a fill-in light.

9. The display panel according to claim 8, wherein the third electrochromic layer is changeable to a target color by a voltage applied between the fifth electrode and the sixth electrode when a screen is turned off or a display is desired;

when the under-screen camera is used, the third electrochromic layer may be changed to a transparent state by a voltage applied between the fifth electrode and the sixth electrode.

10. The display panel according to claim 7, wherein the display substrate further comprises a plurality of thin film transistors between the substrate and the pixel defining layer;

each organic light-emitting functional layer is electrically connected with the first electrode, and is electrically connected with a first thin film transistor through a corresponding seventh electrode, and the first thin film transistor is used for applying a driving signal to the seventh electrode;

each second electrochromic layer is electrically connected with a second thin film transistor through the corresponding third electrode, and the second thin film transistor is used for applying a driving signal to the third electrode;

each third electrochromic layer is electrically connected with a third thin film transistor through the corresponding fifth electrode, and the third thin film transistor is used for applying a driving signal to the fifth electrode.

11. The display panel according to claim 1, wherein the display panel further comprises a cover sheet and a touch layer;

the cover plate, the touch layer and the display substrate are sequentially stacked, and the cover plate and the touch layer are bonded through transparent insulating glue.

12. A display panel driving method for driving the display panel according to any one of claims 1 to 11, comprising:

in the breath-screen state, applying a first voltage between the first electrode and the second electrode to change the first electrochromic layer from a transparent state to a first target color;

13. The method for driving a display panel according to claim 12, further comprising:

under the condition of receiving a bright screen signal, continuously applying a third voltage for a first preset time length between the first electrode and the second electrode so as to enable the first electrochromic layer to be restored to the transparent state from the first target color; the third voltage and the first voltage are equal in magnitude and opposite in direction;

continuously applying a fourth voltage between the third electrode and the fourth electrode for a second preset time in the case of receiving a bright screen signal, so that the second electrochromic layer is restored from the second target color to the primary color; the fourth voltage is equal to the second voltage in magnitude and opposite in direction.