Display panel, preparation method thereof and display device

Abstract

The invention provides a display panel, a preparation method thereof and a display device. The display panel comprises a substrate and a plurality of sub-pixels. The substrate comprises a bonding pad end and a bonding pad far end which are oppositely arranged. The plurality of sub-pixels are positioned on one side of the substrate; wherein in the direction from the bonding pad end to the far end of the bonding pad, the light emitting efficiency of the sub-pixels is in an increasing trend. In the direction from the bonding pad end to the far end of the bonding pad, the light emitting efficiency of the sub-pixels is in an increasing trend, the problem of light emitting efficiency difference caused by the fact that current is gradually reduced from the bonding pad end to the far end of the bonding pad is compensated, and therefore the display uniformity is improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel, a method for preparing a display panel, and a display device. Background Art

[0002] Currently, the folding screens on the market require two screens, the main screen and the secondary screen, which requires two driver chips to control, resulting in an increase in cost. In order to solve this problem, some people have proposed the design of an extended screen, that is, the two screens are combined into one screen, controlled by the same driver chip, and a switching circuit is designed in the middle of the screen.

[0003] However, this design easily causes a large voltage drop on the extended screen, resulting in uneven brightness of the extended screen. Summary of the invention

[0004] Embodiments of the present application provide a display panel, a method for manufacturing a display panel, and a display device to solve the problem of uneven brightness of an extended screen.

[0005] In a first aspect, a display panel is provided, comprising a substrate and a plurality of sub-pixels, wherein the substrate comprises a pad end and a pad distal end that are relatively arranged; the plurality of sub-pixels are located on one side of the substrate; wherein in a direction from the pad end to the pad distal end, the light output efficiency of the sub-pixels tends to increase.

[0006] In combination with the first aspect, in certain implementations of the first aspect, the sub-pixel includes a pixel circuit, the pixel circuit includes a storage capacitor; and in a direction from the pad end to the pad far end, the capacitance value of the storage capacitor tends to decrease.

[0007] In combination with the first aspect, in certain implementations of the first aspect, the storage capacitor includes a first electrode plate and a second electrode plate that are arranged opposite to each other, and the first electrode plate is located between the substrate and the second electrode plate; in the direction from the pad end to the far end of the pad, the facing area between the first electrode plate and the second electrode plate tends to decrease.

[0008] In combination with the first aspect, in certain implementations of the first aspect, a microlens structure layer is further included, which is stacked on the side of the sub-pixel facing away from the substrate; the microlens structure layer includes multiple microlenses, and the microlenses and sub-pixels correspond one to one; in the direction from the pad end to the far end of the pad, the amount of light output by the microlens on the sub-pixel tends to increase.

[0009] In combination with the first aspect, in some implementations of the first aspect, the microlens structure layer further includes a substrate, the substrate includes a plurality of first openings, and the microlenses are located in the first openings; the display panel further includes an insulating layer stacked on one side of the substrate, the insulating layer includes a plurality of second openings, and the sub-pixels are located in the second openings; in a direction from the pad end to the pad distal end, an outward expansion distance of the first opening relative to the second opening tends to increase;

[0010] In combination with the first aspect, in some implementations of the first aspect, the insulating layer includes a pixel definition layer.

[0011] In combination with the first aspect, in some implementations of the first aspect, the device further includes a data signal line and a driver chip, wherein the data signal line extends in a direction from the pad end to the far end of the pad, and the driver chip is located at the pad end and connected to the data signal line;

[0012] In combination with the first aspect, in certain implementations of the first aspect, the display panel also includes a switching circuit located between the pad end and the pad far end; the switching circuit includes a switching switch, the switching switch is coupled to the data signal line, and the switching switch is used to connect or disconnect the data signal line to control the data signal in the data signal line to display the data signal in full screen or partial screen.

[0013] In the second aspect, another display panel is provided, comprising: a substrate, comprising a pad end and a pad far end arranged opposite to each other; and a plurality of sub-pixels, located on one side of the substrate; the sub-pixels include a pixel circuit, and the pixel circuit includes a storage capacitor; in the direction from the pad end to the pad far end, the capacitance value of the storage capacitor tends to decrease.

[0014] In combination with the second aspect, in certain implementations of the second aspect, the storage capacitor includes a first electrode plate and a second electrode plate that are arranged opposite to each other, and the first electrode plate is located between the substrate and the second electrode plate; in the direction from the pad end to the far end of the pad, the facing area between the first electrode plate and the second electrode plate tends to decrease.

[0015] In a third aspect, a method for preparing a display panel is provided, comprising:

[0016] preparing a plurality of sub-pixels on a substrate;

[0017] The substrate includes a pad end and a pad distal end that are arranged opposite to each other, and in a direction from the pad end to the pad distal end, the light extraction efficiency of the sub-pixel shows an increasing trend.

[0018] In a fourth aspect, a display device is provided, comprising any one of the display panels described above.

[0019] The present application provides a display panel, a method for preparing a display panel, and a display device. The display panel includes a substrate and a plurality of sub-pixels, the substrate including a pad end and a pad distal end that are relatively arranged; a plurality of sub-pixels are located on one side of the substrate; wherein, in the direction from the pad end to the pad distal end, the light extraction efficiency of the sub-pixel tends to increase. By setting the light extraction efficiency of the sub-pixel to tend to increase in the direction from the pad end to the pad distal end, the problem of light extraction efficiency difference caused by the gradual decrease of current from the pad end to the pad distal end is compensated, thereby improving display uniformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0021] Figure 1a FIG. 1 is a top view of a display panel in an embodiment of the present application.

[0022] Figure 1b For along Figure 1a Schematic diagram of the cross-sectional structure along the C-C' direction.

[0023] Figure 2 FIG. 1 is a top view of a display panel in an embodiment of the present application.

[0024] Figure 3 Schematic diagram of the variation trend of the light extraction efficiency of a sub-pixel as the external expansion distance increases in one embodiment of the present application.

[0025] Figure 4 FIG. 1 is a top view of a display panel in an embodiment of the present application.

[0026] Figure 5 FIG. 4 is a top view of a display panel in another embodiment of the present application.

[0027] Figure 6 FIG. 4 is a schematic diagram of a circuit structure of a pixel circuit in another embodiment of the present application.

[0028] Figure 7 FIG. 4 is a schematic diagram of a cross-sectional structure of a display panel in another embodiment of the present application.

[0029] Figure 8 FIG. 4 is a process flow chart of a method for preparing a display panel in an embodiment of the present application.

[0030] Fig. 9 FIG. 4 is a process flow chart of a method for preparing a display panel in another embodiment of the present application.

[0031] Fig.10 FIG. 4 is a process flow chart of a method for preparing a display panel in another embodiment of the present application. DETAILED DESCRIPTION

[0032] As described in the background technology, the voltage drop of the prior art extended screen is large, so that the brightness of the extended screen is uneven. In view of this, the present application provides a display panel, a method for preparing a display panel, and a display device. By setting the light extraction efficiency of the sub-pixel to increase in the direction from the pad end to the pad distal end, the problem of light extraction efficiency difference caused by the gradual decrease of current from the pad end to the pad distal end is compensated, thereby improving display uniformity.

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating examples of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians of the art without making creative work are within the scope of protection of the present application. The features and exemplary embodiments of various aspects of the present application will be described in detail below.

[0034] Figure 1a is a top view of a display panel in an embodiment of the present application, Figure 1b For along Figure 1a Schematic diagram of the cross-sectional structure along the C-C' direction. Figure 1b As shown, the display panel includes a substrate 10 and a plurality of sub-pixels 200, and the plurality of sub-pixels 200 are located on one side of the substrate 10. Figure 1a As shown, the substrate 10 includes a pad end B and a pad distal end A that are arranged opposite to each other. In the direction from the pad end B to the pad distal end A, the light extraction efficiency of the sub-pixel 200 is arranged to increase.

[0035] The light extraction efficiency of a sub-pixel refers to the efficiency of a single sub-pixel in converting electrical energy into light energy, and reflects the ability of a sub-pixel to generate light under a given electrical energy. In the present application, the light extraction efficiency of the sub-pixel 200 increases in the direction from the pad end B to the pad distal end A, so as to compensate for the light extraction efficiency difference caused by the gradual decrease of the current from the pad end B to the pad distal end A, thereby improving the display uniformity.

[0036] Specifically, since metal wiring and the like have resistance, a voltage drop will be generated when current passes through. Therefore, when a given driving voltage is constant, the voltage that the sub-pixel 200 at the far end A of the pad can actually receive is lower than that of the sub-pixel 200 at the far end B of the pad, so that the current from the pad end B to the far end A of the pad will gradually decrease, and then the light output efficiency of the sub-pixel 200 from the pad end B to the far end A of the pad will continue to decrease, affecting the display uniformity. In this embodiment, when the external driving voltage is constant, the light output efficiency of the sub-pixel 200 in the direction from the pad end B to the far end A of the pad tends to increase, which can compensate for the problem of reduced light output efficiency from the pad end B to the far end A of the pad due to the voltage drop, thereby improving the display uniformity.

[0037] In one embodiment, Figure 1bAs shown, the display panel further includes a microlens structure layer 30, which is stacked on the side of the sub-pixel 200 away from the substrate 10. The microlens structure layer 30 includes a plurality of microlenses 300, each of which corresponds to a sub-pixel 200. Figure 1b As shown, the microlens 300 can converge the light emitted by the sub-pixel 200, for example, converging the outgoing light with a large viewing angle (i.e., the light with a larger angle between the outgoing direction and the normal of the display panel) to the small viewing angle light closer to the normal viewing direction (i.e., the light with a smaller angle between the outgoing direction and the normal of the display panel).

[0038] In one embodiment, the microlens structure layer 30 further includes a substrate 31, the substrate 31 includes a plurality of first openings 310, and the microlenses 300 are located in the first openings 310. The display panel further includes an insulating layer 40, which is stacked on one side of the substrate 10, and the insulating layer 40 includes a plurality of second openings 410, and the sub-pixels 200 are located in the second openings 410. In the direction from the pad end B to the pad distal end A, the outward expansion distance of the first opening 310 relative to the second opening 410 tends to increase, as shown in FIG. Figure 1b As shown, d1≥d2≥d3≥d4≥d5.

[0039] Depend on Figure 1b It can be seen that the larger the outer expansion distance of the first opening 310 relative to the second opening 410, the more light emitted from the sub-pixel 200 will pass through the second opening 410 and be converged by the microlens 300. Therefore, in the present embodiment, in the direction from the pad end B to the pad distal end A, the convergence amount of the light emitted by the microlens 300 on the sub-pixel 200 tends to increase. In the direction from the pad end B to the pad distal end A that enters the human eye, the light extraction efficiency of the sub-pixel 200 tends to increase, compensating for the problem of light extraction efficiency differences caused by the gradual decrease of current from the pad end to the pad distal end, thereby improving display uniformity.

[0040] In one embodiment, in the direction from the pad end B to the pad distal end A, the outward expansion distance of the first opening 310 relative to the second opening 410 tends to increase in a step-like manner, such as Figure 2 As shown, Figure 2 is a top view of a display panel in an embodiment of the present application. Specifically, the outward expansion distance does not increase gradually, but increases every other row or multiple rows, such as Figure 2 As shown, d1 = d2 ≥ d3 = d4 ≥ d5. In other embodiments, in the direction from the pad end B to the pad distal end A, a similar increasing trend of d1 = d2 = d3 ≥ d4 = d5 may also be achieved.

[0041] In one embodiment, the convergence amount of the light output from the sub-pixel 200 by the microlens 300 can also be adjusted by adjusting parameters such as the boundary inclination angle of the microlens 300, so that in the direction from the pad end B to the pad far end A, the convergence amount of the light output from the sub-pixel 200 by the microlens 300 tends to increase.

[0042] In one embodiment, the insulating layer 40 includes a pixel definition layer. The pixel definition layer is used to ensure that each sub-pixel 200 can emit light independently without interfering or crosstalking with adjacent sub-pixels 200, thereby improving the display effect.

[0043] In one embodiment, the material for preparing the microlens structure may be optical glue. The substrate 31 may be an optical glue with a low refractive index. The microlens may be a silicon nitride layer with a high refractive index, or may be an organic material layer with a high refractive index.

[0044] It should be noted that, under the condition that other parameters are constant, the light extraction efficiency of the sub-pixel does not increase continuously as the outer expansion distance of the first opening 310 relative to the second opening 410 increases. Figure 3 FIG. 1 is a schematic diagram showing the variation trend of the light extraction efficiency of a sub-pixel as the outer expansion distance increases in one embodiment of the present application. Figure 3 As shown, the light extraction efficiency of the sub-pixel increases first and then decreases with the increase of the external expansion distance. When the external expansion distance is L0, the light extraction efficiency of the sub-pixel reaches the maximum value. Generally, the value range of L0 is 1.7μm-2.5μm.

[0045] In one embodiment, the data signal line 50 and the driving chip 60 are also included. Figure 4 As shown, Figure 4 FIG. 1 is a top view of a display panel in an embodiment of the present application. Figure 4 As shown, the data signal line 50 extends from the pad end B to the pad distal end A, and the driving chip 60 is located at the pad end B and connected to the data signal line 50 .

[0046] In one embodiment, the display panel is an extended screen structure, and the display panel further includes a switching circuit 70, which is located between the pad end B and the pad distal end A. The switching circuit 70 includes a switching switch 710, which is coupled to the data signal line 50, and the switching switch 710 is used to connect or disconnect the data signal line 50 to control the full-screen display or partial-screen display of the data signal in the data signal line 50. The switching circuit 70 realizes circuit switching by controlling the on and off of the switching switch 710. In the extended screen structure, the switching circuit 70 is used to cut the input signals from different screens into the same output terminal to realize the switching of the screen.

[0047] Figure 5 FIG. 1 is a top view of a display panel in another embodiment of the present application. Figure 5 As shown, the display panel is a common single-screen structure. Similarly, in the direction from the pad end B to the pad distal end A, the outward expansion distance of the first opening 310 relative to the second opening 410 also tends to increase. Figure 5 As shown, d1≥d2≥d3.

[0048] and Figure 1b Similarly, in this embodiment, in the direction from the pad end B to the pad distal end A, the convergence amount of the light output by the microlens 300 for the sub-pixel 200 tends to increase. In the direction from the pad end B to the pad distal end A that enters the human eye, the light output efficiency of the sub-pixel 200 tends to increase, compensating for the difference in light output efficiency caused by the gradual decrease of current from the pad end to the pad distal end, thereby improving display uniformity.

[0049] However, the voltage drop from the pad end B to the pad far end A in the single-screen structure is smaller than that in the extended screen structure. Therefore, the difference between the outward expansion distances between different rows can be smaller than that in the extended screen structure.

[0050] In one embodiment, each sub-pixel includes a pixel circuit such as Figure 6 As shown, Figure 6 FIG. 1 is a schematic diagram of a circuit structure of a pixel circuit in another embodiment of the present application. Figure 6 As shown, the pixel circuit of the display panel includes a storage capacitor Cst, and in the direction from the pad end B to the pad distal end A, the capacitance value of the storage capacitor Cst tends to decrease.

[0051] Specifically, the pixel circuit is a 7T1C circuit, such as Figure 6 As shown, the pixel driving circuit specifically includes a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, a fifth transistor T5, a sixth transistor T6, a seventh transistor T7 and a storage capacitor Cst.

[0052] In this pixel circuit, the fifth transistor T5, the first transistor T1 and the sixth transistor T6 form a light emitting path. Figure 6 It can be seen that the first electrode of the storage capacitor Cst is connected to ELVDD, and the second electrode is connected to the gate of the first transistor. When the capacitance value of the storage capacitor Cst decreases, the current passing through the light-emitting device OLED will increase. Therefore, in the direction from the pad end B to the pad distal end A, the capacitance value of the storage capacitor Cst is set to decrease, which can compensate for the problem of current reduction caused by the reduction in the cross-voltage between the positive power signal line ELVDD and the negative power signal line ELVSS due to the voltage drop, so that the difference in sub-pixel light output efficiency from the pad end B to the pad distal end A is weakened, thereby improving display uniformity.

[0053] Figure 7FIG. 2 is a schematic diagram of a cross-sectional structure of a display panel in another embodiment of the present application. Figure 7 As shown, the storage capacitor Cst includes a first electrode plate 81 and a second electrode plate 82 arranged opposite to each other, and the first electrode plate 81 is located between the substrate 10 and the second electrode plate 82. In the direction from the pad end to the pad distal end, the facing area between the first electrode plate 81 and the second electrode plate 82 tends to decrease.

[0054] Specifically, there is a direct relationship between the capacitance value and the area facing the capacitor plates, that is, C = εS / 4πkd, where ε is a constant, S is the area facing the capacitor plates, d is the distance between the capacitor plates, and k is the electrostatic force constant. It can be seen from the above formula that the capacitance value is proportional to the area facing the first plate 81 and the second plate 82, that is, if the area facing the plates is increased, the capacitance value will increase; conversely, if the area facing the plates is reduced, the capacitance value will decrease.

[0055] Therefore, in this embodiment, the area facing each other between the first electrode plate and the second electrode plate decreases in the direction from the pad end to the pad distal end. Accordingly, the capacitance value of the storage capacitor Cst also decreases in the direction from the pad end to the pad distal end. Figure 6 Analysis shows that the capacitance value of the storage capacitor Cst shows a decreasing trend, which can compensate for the problem of current reduction caused by the reduction in the cross-voltage between the positive power signal line ELVDD and the negative power signal line ELVSS due to the voltage drop, so that the difference in sub-pixel light output efficiency from the pad end B to the pad far end A is weakened, thereby improving display uniformity.

[0056] In one embodiment, the display panel further includes a plurality of sub-pixels 200 , and the plurality of sub-pixels 200 are located on a side of the storage capacitor Cst away from the substrate 10 .

[0057] In one embodiment, the display panel is an extended screen structure, and the display panel further includes a switching circuit 70 located between the pad end B and the pad distal end A. The switching circuit 70 includes a switching switch 710 , and the switching switch 710 is coupled to the data signal line 50 .

[0058] In one embodiment, the display panel may also be a single-screen structure.

[0059] The present application also provides another display panel. Figure 6 The display panel includes: a substrate 10 and a plurality of sub-pixels 200. The substrate 10 includes a pad end B and a pad distal end A that are arranged opposite to each other. The plurality of sub-pixels 200 are located on one side of the substrate 10. The sub-pixel 200 includes a pixel circuit, and the pixel circuit includes a storage capacitor Cst. In the direction from the pad end B to the pad distal end A, the capacitance value of the storage capacitor Cst tends to decrease.

[0060] In one embodiment, see Figure 7 The storage capacitor Cst includes a first electrode plate 81 and a second electrode plate 82 that are arranged opposite to each other, and the first electrode plate 81 is located between the substrate 10 and the second electrode plate 82. In the direction from the pad end B to the pad distal end A, the facing area between the first electrode plate 81 and the second electrode plate 82 tends to decrease.

[0061] For relevant technical details of the display panel provided in this embodiment, please refer to Figure 6 and Figure 7 The embodiments shown will not be described in detail here.

[0062] The present application also provides a method for preparing a display panel, such as Figure 8 shown. Figure 8 1 is a process flow chart of a method for preparing a display panel in an embodiment of the present application. The following takes the display panel in an embodiment of the present application as an example to describe in detail the method for preparing a display panel proposed in the present application.

[0063] S810: preparing a plurality of sub-pixels on a substrate; wherein the substrate comprises a pad end and a pad distal end that are arranged opposite to each other, and in a direction from the pad end to the pad distal end, the light extraction efficiency of the sub-pixels tends to increase.

[0064] In the present embodiment, during the preparation of the sub-pixel, when the external driving voltage is constant, the light output efficiency of the sub-pixel tends to increase in the direction from the pad end to the far end of the pad, which can compensate for the problem of reduced light output efficiency from the pad end to the far end of the pad caused by the voltage drop, thereby improving display uniformity.

[0065] Fig. 9 FIG. 1 is a process flow chart of a method for preparing a display panel in another embodiment of the present application. In this embodiment, preparing a plurality of sub-pixels on a substrate includes:

[0066] S910: Prepare a pixel circuit layer on a substrate, the pixel circuit layer including a plurality of pixel circuits; wherein the pixel circuit includes a storage capacitor, and a first mask plate is used in the process of preparing the storage capacitor, the first mask plate including a first end and a second end arranged opposite to each other, and in a direction from the first end to the second end, an opening area of ​​the first mask plate tends to decrease.

[0067] Specifically, in the process of preparing the storage capacitor, it is necessary to set the area of ​​the storage capacitor electrode plate with the help of a mask plate, and the opening area of ​​the mask plate determines the area size of the storage capacitor electrode plate. In this embodiment, the first end of the first mask plate corresponds to the pad end of the display panel, and the second section of the mask plate corresponds to the pad distal end of the display panel. In the direction from the first end to the second end, the opening area of ​​the first mask plate tends to decrease, and accordingly, in the direction from the pad end to the pad distal end, the capacitance value of the storage capacitor tends to decrease. Such a setting can compensate for the problem of current reduction caused by the reduction in cross-voltage between the positive power signal line ELVDD and the negative power signal line ELVSS due to the voltage drop, so that the difference in sub-pixel light output efficiency from the pad end B to the pad distal end A is weakened, thereby improving display uniformity.

[0068] S920: preparing a plurality of light-emitting devices on a side of the pixel circuit layer away from the substrate, and connecting the light-emitting devices and the pixel circuits one by one.

[0069] Fig.10 FIG. 1 is a process flow chart of a method for preparing a display panel in another embodiment of the present application. In this embodiment, preparing a plurality of sub-pixels on a substrate includes:

[0070] S1010: preparing a pixel circuit layer on a substrate, wherein the pixel circuit layer includes a plurality of pixel circuits.

[0071] S1020: preparing a plurality of light-emitting devices on a side of the pixel circuit layer away from the substrate, and connecting the light-emitting devices and the pixel circuits one by one.

[0072] S1030: preparing a microlens structure layer on the side of the sub-pixel away from the substrate, the microlens structure layer comprising a plurality of microlenses, and the microlenses and the sub-pixels correspond one to one; wherein a second mask plate is used in the process of preparing the microlens layer, the second mask plate comprising a third end and a fourth end arranged opposite to each other, and in a direction from the third end to the fourth end, the opening area of ​​the second mask plate tends to increase.

[0073] Specifically, in the process of preparing the microlens structure layer, it is necessary to set the area of ​​the microlens structure with the help of a mask plate, and the size of the mask plate opening determines the size of the microlens in the direction parallel to the substrate. In this embodiment, the third end of the second mask plate corresponds to the pad end of the display panel, and the fourth section of the second mask plate corresponds to the pad distal end of the display panel. In the direction from the third end to the fourth end, the opening area of ​​the second mask plate tends to increase, and accordingly, in the direction from the pad end to the pad distal end, the size of the microlens in the direction parallel to the substrate tends to increase. In the direction from the pad end B to the pad distal end A that enters the human eye, the light output efficiency of the sub-pixel 200 tends to increase, compensating for the problem of light output efficiency differences caused by the gradual decrease of current from the pad end to the pad distal end, thereby improving display uniformity.

[0074] In one embodiment, the microlens structure further includes a substrate layer, which is located on the side of the microlens close to the substrate. The material for preparing the microlens structure may be an optical adhesive. The substrate 31 may be an optical adhesive with a low refractive index. The microlens may be a silicon nitride layer with a high refractive index, or may be an organic material layer with a high refractive index.

[0075] The present application also provides a display device, including the display panel of any of the above embodiments. The display device can be any product or component with a display function, such as a mobile phone, a bracelet, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame or a navigator. The display device can be an extended screen structure or a single screen structure, and is mainly suitable for an extended screen structure where the voltage drop has a greater impact on the display effect.

[0076] It should be noted that in the accompanying drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. It is also understood that when an element or layer is referred to as being "on" another element or layer, it may be directly on the other element, or there may be an intermediate layer. In addition, it is understood that when an element or layer is referred to as being "under" another element or layer, it may be directly under the other element, or there may be more than one intermediate layer or element. In addition, it is also understood that when a layer or element is referred to as being "between" two layers or two elements, it may be the only layer between the two layers or two elements, or there may also be more than one intermediate layer or element. Similar reference numerals throughout the text indicate similar elements.

[0077] In addition, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0078] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A display panel, characterized in that: include: A substrate, comprising a pad end and a pad distal end arranged opposite to each other; and A plurality of sub-pixels are located on one side of the substrate; Wherein, in the direction from the pad end to the pad distal end, the light extraction efficiency of the sub-pixel shows an increasing trend.

2. The display panel according to claim 1, characterized in that: The sub-pixel includes a pixel circuit, and the pixel circuit includes a storage capacitor; in a direction from the pad end to the pad distal end, the capacitance value of the storage capacitor tends to decrease.

3. The display panel according to claim 2, characterized in that: The storage capacitor includes a first electrode plate and a second electrode plate arranged opposite to each other, wherein the first electrode plate is located between the substrate and the second electrode plate; in a direction from the pad end to the pad distal end, a facing area between the first electrode plate and the second electrode plate tends to decrease.

4. The display panel according to claim 1, characterized in that: It also includes a microlens structure layer, which is stacked on the side of the sub-pixel away from the substrate; the microlens structure layer includes a plurality of microlenses, and the microlenses correspond to the sub-pixels one by one; in the direction from the pad end to the pad far end, the microlens converges the light output of the sub-pixel in an increasing trend.

5. The display panel according to claim 4, characterized in that: The microlens structure layer further includes a substrate, the substrate includes a plurality of first openings, and the microlenses are located in the first openings; the display panel further includes an insulating layer stacked on one side of the substrate, the insulating layer includes a plurality of second openings, and the sub-pixels are located in the second openings; In the direction from the pad end to the pad distal end, the outward expansion distance of the first opening relative to the second opening tends to increase; Preferably, the insulating layer includes a pixel definition layer.

6. The display panel according to claim 1, characterized in that: It also includes a data signal line and a driving chip, wherein the data signal line extends in a direction from the pad end to the far end of the pad, and the driving chip is located at the pad end and is electrically connected to the data signal line; Preferably, the display panel also includes a switching circuit located between the pad end and the pad far end; the switching circuit includes a switching switch, the switching switch is coupled to the data signal line, and the switching switch is used to connect or disconnect the data signal line to control the data signal in the data signal line to display the data signal in full screen or partial screen.

7. A display panel, characterized in that: include: A substrate, comprising a pad end and a pad distal end arranged opposite to each other; and A plurality of sub-pixels are located on one side of the substrate; the sub-pixels include pixel circuits, and the pixel circuits include storage capacitors; in a direction from the pad end to the pad distal end, the capacitance value of the storage capacitor tends to decrease.

8. The display panel according to claim 7, characterized in that: The storage capacitor includes a first electrode plate and a second electrode plate arranged opposite to each other, wherein the first electrode plate is located between the substrate and the second electrode plate; in a direction from the pad end to the pad distal end, a facing area between the first electrode plate and the second electrode plate tends to decrease.

9. A method for preparing a display panel, characterized in that: include: preparing a plurality of sub-pixels on a substrate; Wherein, the substrate comprises a pad end and a pad distal end which are arranged opposite to each other, and in a direction from the pad end to the pad distal end, the light extraction efficiency of the sub-pixel shows an increasing trend.

10. A display device, characterized in that: A display panel comprising any one of claims 1-8.

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