Display panel and display device

Abstract

The application provides a display panel and a display device, and relates to the technical field of display, wherein the display panel comprises a controller, a substrate, a light-emitting layer and an encapsulation layer which are stacked from bottom to top; the light-emitting layer comprises a plurality of first pixel light-emitting structures and pixel definition structures located between adjacent first pixel light-emitting structures, a plurality of grooves are formed on the pixel definition structures, and the pixel definition structures are provided with the pixel light-emitting structures in the grooves; the encapsulation layer is provided with an electrostrictive component at a position corresponding to the pixel definition structure, and a lower surface of the electrostrictive component covers the grooves; the electrostrictive component is electrically connected to the controller, and the controller is used for controlling the electrostrictive component to contract towards a light-emitting direction, so as to change the gap size between the lower surface of the electrostrictive component and the groove opening. The technical scheme provided by the application can improve the flexibility of the user's use of the privacy protection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display panel and a display device. BACKGROUND

[0002] With the development of display technology, the visual angle of display panel is continuously widened. While users enjoy the wide visual angle, the leakage of personal information may also occur. For example, when a user communicates with friends and relatives through a mobile phone, the user does not want the content displayed on the mobile phone to be viewed by others, so as to avoid information leakage.

[0003] In order to strengthen the protection of personal information, an anti-peeping film is usually attached to the display panel to achieve the anti-peeping effect. However, this anti-peeping method is not flexible enough to use. SUMMARY

[0004] Therefore, the present application provides a display panel and a display device to improve the flexibility of user use.

[0005] To achieve the above purpose, in a first aspect, an embodiment of the present application provides a display panel, comprising: a controller, a substrate, a light-emitting layer and an encapsulation layer which are stacked from bottom to top;

[0006] The light-emitting layer comprises a plurality of first pixel light-emitting structures and a pixel definition structure located between adjacent first pixel light-emitting structures, a recess is formed on the pixel definition structure, and a second pixel light-emitting structure is arranged in the recess;

[0007] An electrostrictive component is arranged at a position corresponding to the pixel definition structure in the encapsulation layer, and a lower surface of the electrostrictive component covers the recess; the electrostrictive component comprises a first electrode, an electrostrictive layer and a second electrode, the controller is electrically connected with the first electrode and the second electrode respectively, the controller is used to control an electric field between the first electrode and the second electrode, and the electrostrictive layer can contract towards a light-emitting direction under the driving action of the electric field, so as to change the gap size between the lower surface of the electrostrictive component and the slot of the recess.

[0008] In a possible implementation of the first aspect, the cross-sectional area of the electrostrictive layer gradually increases along the light-emitting direction.

[0009] In a possible implementation of the first aspect, the longitudinal cross-section of the electrostrictive layer is semicircular or triangular.

[0010] In a possible implementation of the first aspect, the projection range of the recess on the substrate is within the projection range of the electrostrictive layer on the substrate.

[0011] In a possible implementation of the first aspect, the first electrode and the second electrode are embedded in the electrostrictive layer, or the electrostrictive layer is sandwiched between the first electrode and the second electrode.

[0012] In a possible implementation of the first aspect, a lower surface of the electrostrictive component is covered with a first reflective layer.

[0013] In a possible implementation of the first aspect, the first pixel light-emitting structure comprises, in a stacking direction, an anode layer, a light-emitting material layer, and a cathode layer covering the light-emitting material layer and the pixel definition structure.

[0014] In a possible implementation of the first aspect, the pixel light-emitting structure disposed in the groove is further provided with a second reflective layer.

[0015] In a possible implementation of the first aspect, an upper surface of the electrostrictive component is provided with a light-blocking layer.

[0016] In a second aspect, an embodiment of the present application provides a display device, comprising a driving circuit and the display panel as described in the first aspect or any of the possible implementations of the first aspect, wherein the driving circuit is configured to drive the display panel to display.

[0017] An embodiment of the present application provides a display panel and a display device, wherein the display panel comprises a controller, a substrate, a light-emitting layer, and an encapsulation layer, which are stacked from bottom to top; the light-emitting layer comprises a plurality of first pixel light-emitting structures and pixel definition structures located between adjacent first pixel light-emitting structures, the pixel definition structures are provided with a plurality of grooves, and the grooves are provided with pixel light-emitting structures; the encapsulation layer is provided with an electrostrictive component at a position corresponding to the pixel definition structure, and a lower surface of the electrostrictive component covers the groove; the electrostrictive component comprises a first electrode, an electrostrictive layer, and a second electrode, the controller is electrically connected to the first electrode and the second electrode respectively, the controller is configured to control an electric field between the first electrode and the second electrode, and the electrostrictive layer is capable of shrinking towards a light-emitting direction under the driving action of the electric field, so as to change a gap size between the lower surface of the electrostrictive component and a groove opening of the groove. The technical solution provided in the present application can improve the flexibility of user privacy use. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A first display panel structure diagram provided by an embodiment of the present application;

[0019] Figure 2 A second display panel structure diagram provided by an embodiment of the present application;

[0020] Figure 3 This is a schematic diagram of the structure of a third type of display panel provided in an embodiment of this application;

[0021] Figure 4 for Figure 1 The display panel shown is a schematic diagram of the shared mode;

[0022] Figure 5 for Figure 1 The diagram shown illustrates the display panel switching to privacy mode.

[0023] Figure 6 for Figure 2 The diagram shown illustrates the display panel switching to privacy mode.

[0024] Figure 7 for Figure 3 The diagram shown illustrates the display panel switching to privacy mode.

[0025] Figure 8 This is a schematic diagram of the structure of the display device provided in the embodiments of this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1-Substrate; 11-Substrate; 12-Circuit layer;

[0028] 2-Emitting layer; 21-First pixel emitting structure; 211-Anode layer; 212-Emitting material layer; 213-Cathode layer; 22-Pixel definition structure; 221-Groove; 2211-Second pixel emitting structure;

[0029] 3-Encapsulation layer; 4-Electrostrictive component; 41-First electrode; 42-Electrostrictive layer; 43-Second electrode;

[0030] 5-Light-shielding layer; 6-First reflective layer; 7-Second reflective layer;

[0031] 100 - Drive circuit; 200 - Display panel. Detailed Implementation

[0032] The embodiments of this application are described below with reference to the accompanying drawings. The terminology used in the implementation section of this application is only for explaining specific embodiments and is not intended to limit the application. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0033] Figure 1 This is a schematic diagram of the structure of a first type of display panel provided in an embodiment of this application. Figure 1As shown, the display panel can include, from bottom to top, a substrate 1, a light-emitting layer 2, and an encapsulation layer 3.

[0034] The substrate 1 includes a substrate 11 and a circuit layer 12 formed on the substrate 11. The substrate 11 can include a rigid substrate and a flexible substrate, where the rigid substrate can be made of materials such as glass, quartz, and organic polymers, etc., to reduce the manufacturing cost. The flexible substrate can be made of materials such as polyimide or polyethylene terephthalate, etc., to improve the flexibility of the display panel.

[0035] In consideration of the case where the substrate 11 is a transparent substrate, the light generated by the light-emitting layer 2 can pass through the substrate 11 and exit the display device, causing light leakage. In some embodiments, the substrate 11 can be doped with a light-blocking material such as carbon black or black organic dye, to block the light from exiting the substrate 11.

[0036] It should be noted that if the material of the substrate 11 is selected to be a conductive material, in order to improve the reliability of the light-emitting layer 2, an insulating protective layer can be formed on the upper surface of the substrate 11. In this way, not only can the occurrence of short circuit be reduced, but also the problems of lattice mismatch and thermal expansion coefficient mismatch between the subsequently formed film layers and the substrate 1 can be alleviated, thereby improving the device performance and yield of the display panel.

[0037] The circuit layer 12 can include thin film transistors and metal wires arranged in an array. The thin film transistors can be connected to the metal wires to collectively constitute the circuit layer of the display panel, for driving the light-emitting layer 2 to emit light.

[0038] The light-emitting layer 2 can be an organic light-emitting diode (OLED) light-emitting layer. The light-emitting layer 2 can include a plurality of first pixel light-emitting structures 21 and pixel definition structures 22 located between adjacent first pixel light-emitting structures 21. The first pixel light-emitting structures 21 can emit light under the driving action of the circuit layer 12, and the pixel definition structures 22 can define a plurality of sub-pixel light-emitting areas to reduce the light interference between adjacent sub-pixel light-emitting areas, thereby improving the color accuracy and detail performance of the display image.

[0039] A recess 221 can be formed on each pixel definition structure 22, and the depth of the recess 221 can be set as needed. A second pixel light-emitting structure 2211 can be arranged in the recess 221. Of course, in some embodiments, the number of recesses 221 can also be more than one. Figure 1 For example, one recess 221 is formed on each pixel definition structure 22, and the bottom of the recess 221 exposes the upper surface of the circuit layer 12.

[0040] For example, one recess 221 is formed on each pixel definition structure 22, and the bottom of the recess 221 exposes the upper surface of the circuit layer 12. Figure 1The first pixel light emitting structure 21 can include an anode layer 211, a light emitting material layer 212, and a cathode layer 213 which are stacked in a light emitting direction. The light emitting material layer 212 can include an electron injection layer, an electron transport layer, an organic material layer, a hole transport layer, and a hole injection layer. The cathode layer 213 can generate electrons under the action of current, and the electrons are transmitted to the light emitting material layer 212 through the electron injection layer and the electron transport layer. The anode layer 211 can generate holes under the action of current, and the holes are transmitted to the light emitting material layer 212 through the hole injection layer and the hole transport layer. The holes and the electrons can combine in the light emitting material layer 212 to emit light.

[0041] It should be noted that the light generated by the first pixel light emitting structure 21 can be one of red, green, or blue. The light generated by adjacent first pixel structures can be different in color. The specific color can be selected by adjusting the material of the organic material layer according to actual needs. The embodiments of the present application will not be described here.

[0042] The structure of the second pixel light emitting structure 2211 can refer to the first pixel light emitting structure 21. The difference is that the light generated by the second pixel light emitting structure 2211 can be white light. In some embodiments, it can also be other colors of light. For example, Figure 1 The light generated by the first pixel light emitting structure 21 on the left side can be red light. The light generated by the first pixel light emitting structure 21 on the right side can be green light. The light generated by the second pixel light emitting structure 2211 can be blue light, so as to form a mixed color when the privacy is prevented. The color of the light generated by the second pixel light emitting structure 2211 can be selected according to actual needs. The present application does not make special limitations here.

[0043] The first pixel light emitting structure 21 and the second pixel light emitting structure 2211 can be independent of each other through the pixel definition structure 22. In some embodiments, referring to Figure 1 The first pixel light emitting structure 21 and the second pixel light emitting structure 2211 can also be connected through the cathode material covering the pixel definition structure 22, so as to reduce the preparation difficulty.

[0044] The encapsulating layer 3 can select one or more of inorganic encapsulating materials, organic encapsulating materials, and inorganic-organic composite encapsulating materials. For example, the inorganic-organic composite encapsulating material can be selected. The inorganic-organic composite encapsulating material can have the advantages of high water and oxygen blocking property of inorganic encapsulating materials and good film forming property of organic encapsulating materials, and also has good light transmittance, thereby improving the use reliability of the display panel.

[0045] The position corresponding to the pixel definition structure 22 in the encapsulation layer 3 can be provided with the electrostrictive component 4. When the display device is in the wide-view sharing mode, the lower surface of the electrostrictive component 4 can cover the groove 221, so that on the one hand, the light of the second pixel light-emitting structure 2211 can be blocked from interfering with the adjacent sub-pixels, and on the other hand, the electrostrictive component 4 can further reduce color mixing and improve the color accuracy of the display image, thereby improving the display quality.

[0046] Referring to Figure 1 The electrostrictive component 4 can include a first electrode 41, an electrostrictive layer 42, and a second electrode 43. A controller (not shown) can be electrically connected to the first electrode 41 and the second electrode 43 through wires, and can change the electric field between the first electrode 41 and the second electrode 43 by changing the voltage applied to the first electrode 41 and the second electrode 43. The controller can be located at any position of the display panel, and the present application does not make special limitations on this. The first electrode 41 and the second electrode 43 can be embedded in the electrostrictive layer 42, thereby simplifying the structure. In some embodiments, the electrostrictive layer 42 can also be sandwiched between the first electrode 41 and the second electrode 43. The width of the first electrode 41 and the second electrode 43 is less than or equal to the width of the electrostrictive layer 42.

[0047] The electrostrictive layer 42 can contract towards the light-emitting direction under the driving action of the electric field, thereby changing the gap size between the lower surface of the electrostrictive component 4 and the notch of the groove 221.

[0048] The electrostrictive layer 42 can include an electrostrictive material. Under the action of an external electric field, the internal molecules of the electrostrictive material can be polarized, that is, the positive charges and the negative charges move in opposite directions, resulting in the contraction of the electrostrictive material in the direction of the electric field until the internal elastic force and the electric force reach a balance. It should be noted that this deformation is reversible, which means that if the direction of the electric field changes, the direction of the deformation of the electrostrictive material will also change accordingly, that is, the electrostrictive material can return to the initial shape. The material of the electrostrictive layer 42 can include one or more of dielectric elastomers, liquid crystal elastomers, ferroelectric polymers, ionic polymer-metal composites, carbon nanotubes, and electrorheological materials.

[0049] In the preparation of the encapsulation layer 3, a layer of electrostrictive material can be formed by sputtering, and then patterned by exposure, development, and other processes to form a specified shape. After the electrostrictive layer 42 is formed, an encapsulation material is coated on the electrostrictive layer 42 to form the encapsulation layer 3.

[0050] The cross-sectional area of the electrostrictive layer 42 can gradually increase along the light-emitting direction. For example, Figure 1 The longitudinal cross-section of the electrostrictive layer 42 can be semicircular.Figure 2 A second structure diagram of a display panel is provided for the embodiments of the present application, as shown in Figure 2 Compared with Figure 1 , Figure 2 the longitudinal section of the electrostrictive layer 42 in Figure 3 is triangular, and the part of the electrostrictive layer 42 extending into the groove 221 can be selected according to actual needs. Of course, in actual products, the longitudinal section shape of the electrostrictive layer 42 can also be other shapes, such as rectangular, trapezoidal, or irregular, etc., as shown in .

[0051] Figure 4 As shown in Figure 1 , the display panel is a schematic diagram of a sharing mode, as shown in Figure 4 , exemplarily, when the display device is in the wide-view sharing mode, the second pixel light-emitting structure 2211 can not emit light to reduce power consumption, or can emit light to reduce manufacturing cost. The controller can not output voltage to the first electrode 41 and the second electrode 43, and the electrostrictive component 4 maintains the initial shape, so that the lower surface of the electrostrictive component 4 can cover the notch, thereby blocking the light emitted by the second pixel light-emitting structure 2211 from exiting the groove 221, and the side view angle is visible. In some embodiments, the projection range of the groove 221 on the substrate 1 can be located within the projection range of the electrostrictive layer 42 on the substrate 1, thereby further improving the light blocking effect of the electrostrictive component 4.

[0052] Figure 5 As shown in Figure 1 , the display panel is switched to a schematic diagram of a privacy mode, as shown in Figure 5 , after the display device is switched from the wide-view sharing mode to the narrow-view privacy mode, the controller can apply a driving electric field to the electrostrictive layer 42 through the first electrode 41 and the second electrode 43, and the electrostrictive layer 42 shrinks along the light-emitting direction under the action of the driving electric field, thereby increasing the gap between the electrostrictive component 4 and the notch of the groove 221, and the light emitted by the second pixel light-emitting structure 2211 can exit the groove 221. Taking the light emitted by the second pixel light-emitting structure 2211 as white light as an example, the light exiting the groove 221 and the light emitted by the adjacent first pixel light-emitting structure 21 form a color mixture at the side view angle, thereby producing a color difference to interfere with the normal display of the picture, and further making the personnel located at the side of the display panel unable to clearly see the content displayed by the display panel, thereby realizing the privacy effect.

[0053] Similarly, Figure 6 As shown in Figure 2 , the display panel is switched to a schematic diagram of a privacy mode, Figure 7 As shown in Figure 3The display panel shown in the figure switches to the privacy mode, and the second display panel and the third display panel are in the sharing mode and the privacy mode. The description can be referred to the above related description. Here, no longer described in detail.

[0054] It can be understood that the contraction degree of the electrostrictive layer 42 (related to the electric field intensity) is different, and the angle of the privacy is also different, so as to realize the adjustable privacy range. When the display device is switched from the privacy mode to the sharing mode, the controller changes the direction of the electric field applied to the electrostrictive layer 42, so that it can cover the stretching in the direction opposite to the light emitting direction, thereby covering the groove 221. The light angle and light quantity emitted from the groove 221 are positively correlated with the size of the gap.

[0055] In a possible implementation, an optical shielding layer 5 can be arranged on the upper surface of the electrostrictive assembly 4, and the upper surface of the optical shielding layer 5 can be flush with the encapsulation layer 3, thereby reducing the preparation difficulty. The lower surface of the electrostrictive assembly 4 can be covered with a first reflective layer 6, so that the light emitted from the adjacent first pixel light emitting structure 21 into the groove 221 and / or the light generated by the second pixel light emitting structure 2211 (the dashed arrow in the figure) can be reflected in the privacy mode, and then emitted from the groove 221 through the gap, thereby improving the utilization rate of the light. The material of the first reflective layer 6 can be selected to be a flexible material, so that it can be attached to the lower surface of the electrostrictive assembly 4 at all times. Correspondingly, a second reflective layer 7 can also be arranged on the pixel light emitting structure arranged in the groove 221, so as to further improve the utilization rate of the light. The second reflective layer 7 can be prepared from a transparent material in the prior art, and the embodiments of the present application will not be described here. Figure 5

[0056] The display panel provided by the embodiments of the present application comprises a controller, a substrate, a light emitting layer and an encapsulation layer arranged from bottom to top; the light emitting layer comprises a plurality of first pixel light emitting structures and pixel definition structures located between adjacent first pixel light emitting structures, the pixel definition structures are provided with a plurality of grooves, and the pixel light emitting structures are arranged in the grooves; the encapsulation layer is provided with an electrostrictive assembly at a position corresponding to the pixel definition structure, and the lower surface of the electrostrictive assembly covers the groove; the electrostrictive assembly comprises a first electrode, an electrostrictive layer and a second electrode, the controller is electrically connected with the first electrode and the second electrode respectively, the controller is used for controlling the electric field between the first electrode and the second electrode, and the electrostrictive layer can contract towards the light emitting direction under the driving action of the electric field, thereby changing the gap size between the lower surface of the electrostrictive assembly and the groove. The technical solution provided by the present application can improve the flexibility of the user's privacy use.

[0057] Based on the same inventive concept, the embodiments of the present application also provide a display device. Figure 8 The structure schematic diagram of the display device provided by the embodiments of the present application is shown in the figure.​Figure 8 As shown, the display device can include a driving circuit 100 and the display panel 200 of any of the above embodiments, the driving circuit 100 can be electrically connected with the display panel 200, for driving the display panel 200 to display a picture.

[0058] Since the display device in the embodiment includes the display module in the above embodiments, i.e., the display device in the embodiment has all the technical features and technical effects of the above embodiments of the display module, for details, refer to the above embodiments, which will not be repeated here.

[0059] It should be understood that in the description of the present application and the appended claims, the terms "comprise", "contain", "have" and any variations thereof are intended to cover non-exclusive inclusion, and mean "including but not limited to", unless otherwise specifically emphasized.

[0060] In the description of the present application, unless otherwise specified, " / " means that the objects before and after are in an "or" relationship, for example, A / B can mean A or B; "and / or" in the present application is used to describe the relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can mean that A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural.

[0061] Also, in the description of the present application, unless otherwise specified, "multiple" means two or more than two. "At least one of the following" or similar expressions means any combination of the items, including any combination of single or multiple items.

[0062] In addition, in the description of the present application, it should be understood that the terms "vertical", "horizontal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0063] In the present application, unless otherwise specifically specified and limited, the terms "connection", "connection" and the like should be understood broadly, for example, it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited, the above-mentioned terms in the present application can be understood according to the specific meaning of the specific circumstances.

[0064] Furthermore, in the description of this application and the appended claims, the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than that illustrated or described herein; features defined as "first" or "second" may explicitly or implicitly include at least one of those features.

[0065] In the embodiments of this application, the words "exemplarily" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplarily" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of the words "exemplarily" or "for example" is intended to present the relevant concepts in a specific manner.

[0066] References to "one embodiment" or "some embodiments" in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A display panel, characterized by, The display panel comprises: a controller, a substrate, a light-emitting layer and an encapsulation layer which are stacked from bottom to top; the light-emitting layer comprises a plurality of first pixel light-emitting structures and pixel definition structures located between adjacent first pixel light-emitting structures, the pixel definition structures are provided with grooves, and the grooves are provided with second pixel light-emitting structures; the encapsulation layer is provided with an electrostrictive component corresponding to the pixel definition structure, the lower surface of the electrostrictive component covers the groove, the electrostrictive component comprises a first electrode, an electrostrictive layer and a second electrode, the controller is electrically connected with the first electrode and the second electrode respectively, the controller is used for controlling the electric field between the first electrode and the second electrode, and the electrostrictive layer can contract towards the light-emitting direction under the driving action of the electric field, so as to change the gap size between the lower surface of the electrostrictive component and the groove.

2. The display panel of claim 1, wherein, The cross-sectional area of the electrostrictive layer gradually increases along the light-emitting direction.

3. The display panel of claim 2, wherein, The longitudinal cross section of the electrostrictive layer is semicircular or triangular.

4. The display panel of claim 1, wherein, The projection range of the groove on the substrate is located in the projection range of the electrostrictive layer on the substrate.

5. The display panel of claim 1, wherein, The first electrode and the second electrode are embedded in the electrostrictive layer, or the electrostrictive layer is sandwiched between the first electrode and the second electrode.

6. The display panel of claim 1, wherein, The lower surface of the electrostrictive component is covered with a first reflective layer.

7. The display panel of claim 1, wherein, The first pixel light-emitting structure comprises an anode layer, a light-emitting material layer and a cathode layer which are stacked along the light-emitting direction.

8. The display panel of claim 7, wherein, The pixel light-emitting structure provided in the groove is further provided with a second reflective layer.

9. The display panel of claim 1, wherein, The upper surface of the electrostrictive component is provided with a light-shielding layer.

10. A display device, characterized by comprising: The display panel comprises: a driving circuit and the display panel according to any one of claims 1-9, wherein the driving circuit is used for driving the display panel to display.

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