Display panel and display device

Abstract

The present invention provides a display panel and a display device, in which the charging efficiencies of a first light-emitting element and a second light-emitting element are set to be different, thereby being able to compensate for fluctuations in the light output of a subsequently lit light-emitting element through the light output of the light-emitting element that is preferentially lit and stabilized among the first light-emitting element and the second light-emitting element. This improves the problem of unstable brightness of the first type of light-emitting element due to the large change in the luminous efficiency with the driving current, improves the light output stability of the first color light, avoids the color deviation problem that occurs when the display device switches screens, and ensures a high display effect of the display device.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and more particularly, to a display panel and a display device. Background Art

[0002] With the continuous improvement of display technology, people's requirements for display devices are also constantly increasing. Among various display technologies, self-luminous display devices have been widely used in various electronic devices including computers, mobile phones and other electronic products due to their advantages such as self-luminescence, light weight, low power consumption, high contrast, high color gamut, and flexible display. The self-luminous elements in existing self-luminous display devices are generally organic light emitting diodes (OLED), quantum dot light emitting diodes (QLED), micro light emitting diodes (Micro LED), etc. In actual display, the pixel circuit generally outputs a driving current to drive the light emitting element to emit light, so that the display device can achieve the purpose of displaying the picture. However, the display effect of existing display devices needs to be improved. Summary of the Invention

[0003] In view of this, the present invention provides a display panel and a display device, which effectively solve the existing technical problems. The charging efficiency of the first light-emitting element and the second light-emitting element is set to be different, so that the light output of the light-emitting element that is preferentially lit and stabilized among the first light-emitting element and the second light-emitting element can be used to compensate for the fluctuation of the light output of the light-emitting element that is subsequently lit, thereby avoiding the color deviation problem when the screen is switched, and ensuring the high display effect of the display device.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A display panel comprises: a plurality of light emitting elements, the light emitting elements comprising a first type of light emitting elements generating a first color light, and a second type of light emitting elements generating a second color light;

[0006] Under the same conditions, the luminous efficiency of the first type of light emitting element varies more with the driving current than that of the second type of light emitting element;

[0007] The first type of light emitting elements includes a first light emitting element and a second light emitting element, and the first light emitting element and the second light emitting element have different charging efficiencies.

[0008] Correspondingly, the present invention further provides a display device, which includes the above-mentioned display panel.

[0009] Compared with the existing technology, the technical solution provided by the present invention has at least the following advantages:

[0010] The present invention provides a display panel and a display device, wherein the display panel includes: a plurality of light-emitting elements, wherein the light-emitting elements include a first type of light-emitting element that generates a first color of light, and a second type of light-emitting element that generates a second color of light; under the same conditions, the rate of change of the luminous efficiency of the first type of light-emitting element with a change in driving current is greater than that of the second type of light-emitting element; the first type of light-emitting element includes a first light-emitting element and a second light-emitting element, and the first light-emitting element and the second light-emitting element have different charging efficiencies.

[0011] From the above content, it can be seen that the technical solution provided by the present invention sets the charging efficiency of the first light-emitting element and the second light-emitting element to be different, and then the light output of the light-emitting element that is preferentially lit and stabilized among the first light-emitting element and the second light-emitting element can be used to compensate for the fluctuation of the light output of the light-emitting element that is subsequently lit. This improves the problem of unstable brightness of the first type of light-emitting element due to the large change in the luminous efficiency with the driving current, improves the light output stability of the first color light, avoids the color deviation problem that occurs when the display device switches the screen, and ensures that the display effect of the display device is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0013] Figure 1 A schematic structural diagram of a display panel provided by an embodiment of the present invention;

[0014] Figure 2 A schematic diagram showing the relationship between luminous efficiency and current density of a light-emitting element provided in an embodiment of the present invention;

[0015] Figure 3 A schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0016] Figure 4 A schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0017] Figure 5 A schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0018] Figure 6A schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0019] Figure 7 A schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0020] Figure 8 A schematic structural diagram of a pixel circuit provided by an embodiment of the present invention;

[0021] Figure 9 A timing diagram provided by an embodiment of the present invention;

[0022] Figure 10 A schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0023] Figure 11 A schematic structural diagram of an active region provided by an embodiment of the present invention;

[0024] Figure 12 A schematic structural diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] As described in the background, in actual displays, pixel circuits typically output a driving current to drive light-emitting elements, enabling the display device to display images. However, the luminous efficiency of existing light-emitting elements of different colors varies with changes in the driving current. This results in greater fluctuations in light output from light-emitting elements with greater variations in driving current. This can easily disrupt white balance and cause color casts when switching between images, resulting in poor display quality in existing display devices.

[0027] Based on this, an embodiment of the present invention provides a display panel and a display device, which effectively solve the existing technical problems. The charging efficiency of the first light-emitting element and the second light-emitting element is set to be different, so that the light output of the light-emitting element that is preferentially lit and stabilized among the first light-emitting element and the second light-emitting element can be used to compensate for the fluctuation of the light output of the light-emitting element that is subsequently lit, thereby avoiding the color deviation problem when the screen is switched, and ensuring the high display effect of the display device.

[0028] To achieve the above purpose, the technical solution provided by the embodiment of the present invention is as follows, specifically combined with Figures 1 to 12The technical solution provided by the embodiment of the present invention is described in detail.

[0029] refer to Figure 1 As shown, it is a schematic structural diagram of a display panel provided by an embodiment of the present invention, wherein the display panel provided by the embodiment of the present invention includes a display area AA and a frame area NA, wherein the display area AA includes: a plurality of light-emitting elements, wherein the light-emitting elements include a first type of light-emitting element 11 that generates a first color of light, and a second type of light-emitting element 12 that generates a second color of light. Under the same conditions, the rate of change of the luminous efficiency of the first type of light-emitting element 11 with the change of the driving current is greater than the rate of change of the luminous efficiency of the second type of light-emitting element 12 with the change of the driving current, wherein the first type of light-emitting element 11 and the second type of light-emitting element 12 light up in response to the driving current connected to each; the first type of light-emitting element 11 includes a first light-emitting element 111 and a second light-emitting element 112, and the charging efficiency of the first light-emitting element 111 and the second light-emitting element 112 are different.

[0030] It is understandable that the light-emitting element provided by the present invention can be made of OLED (Organic Light-Emitting Diode, organic light-emitting semiconductor) material. The luminous efficiency of OLED material changes greatly with the current density at low grayscale. In particular, under low current density conditions, the luminous efficiency of red light-emitting elements, green light-emitting elements and blue light-emitting elements changes inconsistently with the current under the same current density change conditions. For specific reference Figure 2 As shown in the figure, a schematic diagram of the corresponding relationship between the luminous efficiency and current density of a light-emitting element provided by an embodiment of the present invention is shown, where the horizontal axis represents the current density and the vertical axis represents the luminous efficiency. When the current density is lower than 0.02 (this value is merely an illustrative value and is not specifically limited in the present invention), the change in the luminous efficiency G of the green light-emitting element is greater than the change in the luminous efficiency R of the red light-emitting element and the luminous efficiency B of the blue light-emitting element. Therefore, under the same current density change condition, since the luminous efficiency of the red light-emitting element, the green light-emitting element, and the blue light-emitting element changes inconsistently with the current, the white balance is easily disrupted during the screen switching process of the display device, causing color cast of the screen.

[0031] Therefore, the technical solution provided by the embodiment of the present invention sets the charging efficiency of the first light-emitting element and the second light-emitting element to be different, and then the light output of the light-emitting element that is preferentially lit and stabilized among the first light-emitting element and the second light-emitting element can be used to compensate for the fluctuation of the light output of the light-emitting element that is subsequently lit. This improves the problem of unstable brightness of the first type of light-emitting element due to the large change in the luminous efficiency with the driving current, improves the light output stability of the first color light, avoids the color deviation problem that occurs when the display device switches the screen, and ensures the high display effect of the display device.

[0032] In one embodiment of the present invention, the first type of light emitting element provided by the present invention may be a green light emitting element, and the second type of light emitting element may include a red light emitting element and / or a blue light emitting element.

[0033] refer to Figure 3 , which is a schematic structural diagram of another display panel provided in an embodiment of the present invention, wherein the display panel provided in an embodiment of the present invention includes scan lines (not shown) extending along a first direction X, and data lines (not shown) extending along a second direction Y; in the first direction X and / or the second direction Y, at least one second light-emitting element 112 is included between two adjacent first light-emitting elements 111.

[0034] It can be understood that the present invention optimizes the layout of the positions of the first light-emitting element and the second light-emitting element, not only so that at least one second light-emitting element is arranged around the first light-emitting element, but also so that the first light-emitting element and the second light-emitting element are evenly distributed in the entire display area, thereby effectively compensating for the fluctuation of the light output of the subsequently lit light-emitting elements through the light output of the light-emitting elements that are preferentially lit and stabilized among the first light-emitting element and the second light-emitting element, thereby improving the problem of unstable brightness of the first type of light-emitting element due to the large change in the luminous efficiency with the driving current, and improving the light output stability of the first color light, thereby improving the display effect of the entire screen of the display device.

[0035] In one embodiment of the present invention, the light emitting element provided by the present invention may be a light emitting diode, which is composed of an anode, a light emitting layer and a cathode. Figure 4 FIG. 1 is a schematic structural diagram of another display panel provided by an embodiment of the present invention, wherein the display panel includes:

[0036] Substrate 100.

[0037] The transistor array layer located on the substrate 100 includes transistors, capacitors, and other components that make up the pixel circuit. The transistor array layer comprises a semiconductor layer located on the substrate 100, the semiconductor layer including an active area 210; a gate insulating layer 220 located on the side of the semiconductor layer facing away from the substrate 100; a gate metal layer located on the side of the gate insulating layer 220 facing away from the substrate 100, the gate metal layer including a gate electrode 230; an interlayer insulating layer 240 located on the side of the gate metal layer facing away from the substrate 100; and a source / drain metal layer located on the side of the interlayer insulating layer 240 facing away from the substrate 100. The source / drain metal layer includes a source electrode 251 and a drain electrode 252, which are in contact with the active area 210 through vias. The active area 210, gate electrode 230, source electrode 251, drain electrode 252, and the insulating structure between the layers together constitute a transistor.

[0038] The planarization layer 300 is located on a side of the transistor array layer facing away from the substrate 100 .

[0039] The anode layer is located on a side of the planarization layer 300 facing away from the substrate 100 , and includes a plurality of anodes 400 .

[0040] The pixel definition layer 500 is located on the side of the anode layer facing away from the substrate 100 . The pixel definition layer 500 includes a plurality of pixel openings extending therethrough. The pixel openings are arranged corresponding to the anode 400 .

[0041] The light emitting layer 600 is located in the pixel opening.

[0042] and a cathode 700 located on the side of the light-emitting layer 600 facing away from the substrate 100 , wherein the anode 400 , the light-emitting layer 600 and the cathode 700 constitute a light-emitting element.

[0043] It should be noted that, in the transistor array layer provided in an embodiment of the present invention, the gate is located on the side of the active area facing away from the substrate, so that the transistor is a top-gate transistor; in other embodiments of the present invention, the gate provided by the present invention can also be located on the side of the active area facing the substrate, so that the transistor is a bottom-gate transistor, and the present invention does not impose any specific restrictions on this.

[0044] In order to ensure that the charging efficiency of the first light emitting element and the second light emitting element are different, the embodiment of the present invention can improve the size parameters of the light emitting element itself. Figure 5 As shown, it is a structural schematic diagram of another display panel provided by an embodiment of the present invention, wherein the light-emitting element provided by the embodiment of the present invention includes an anode 400, a light-emitting layer 600 and a cathode 700 stacked in sequence; the area of the anode 400 of the first light-emitting element 111 is different from the area of the anode 400 of the second light-emitting element 112.

[0045] It is understandable that in the embodiment of the present invention, the anode areas of the first and second light-emitting elements are set to be different. Under the same charging conditions, the light-emitting element with a smaller anode area is easier to charge and illuminate than the light-emitting element with a larger anode area, thereby improving the charging efficiency of the light-emitting element with a smaller anode area. Furthermore, by preferentially illuminating and stabilizing the light output of the light-emitting element with a smaller anode area, the fluctuation of the light output of the light-emitting element with a larger anode area that is subsequently illuminated is compensated, thereby improving the problem of unstable brightness of the first type of light-emitting element due to the large change in the luminous efficiency with the change in the driving current, and improving the light output stability of the first color light, thereby improving the display effect of the entire screen of the display device.

[0046] In one embodiment of the present invention, the present invention can set the light emitting element with low charging efficiency among the first light emitting element and the second light emitting element to have a charging efficiency substantially consistent with that of the second type light emitting element. Figure 6As shown in FIG. 1 , a structural schematic diagram of another display panel provided in an embodiment of the present invention is provided, wherein the area of the anode 400 of the first light-emitting element 111 provided in an embodiment of the present invention is smaller than the area of the anode 400 of the second light-emitting element 112; and the ratio of the area of the anode 400 of the second light-emitting element 112 to the area of the anode 400 of the second type light-emitting element 12 is in the range of 0.95-1.05.

[0047] As can be understood, in the embodiments of the present invention, the anode area of the first light-emitting element is set to be smaller than the anode area of the second light-emitting element. This allows the first light-emitting element to be illuminated first to compensate for the light emission fluctuations of the second light-emitting element that is subsequently illuminated, thereby improving the light emission stability of the first color light and thereby enhancing the display effect of the entire screen of the display device. Furthermore, the anode area of the second light-emitting element is set to a ratio of 0.95-1.05 to the anode area of the second type light-emitting element, so that the charging efficiency of the second light-emitting element is substantially consistent with the charging efficiency of the second type light-emitting element, ensuring that the overall light emission time of the first type light-emitting element and the second type light-emitting element is substantially consistent, thereby ensuring a high display effect of the display device.

[0048] Alternatively, in order to further improve the display effect of the display device and avoid the problem that the light output of the first type light emitting element still fluctuates greatly when the light output of the second type light emitting element is stable, the embodiment of the present invention can set the anode area of all the first type light emitting elements to be smaller than the anode area of the second type light emitting element. Figure 7 As shown, the area of the anode 400 of the first light-emitting element 111 and the area of the anode 400 of the second light-emitting element 112 provided in the embodiment of the present invention are both smaller than the area of the anode 400 of the second-type light-emitting element 12. Not only can the light emission fluctuation of the second light-emitting element 112 be compensated by the first light-emitting element 111, but the overall light emission stability of the first-type light-emitting element 11 can also be improved, further avoiding the color cast problem and ensuring high display effect of the entire screen of the display device.

[0049] In order to ensure that the charging efficiency of the first light emitting element and the second light emitting element are different, the embodiment of the present invention can also improve the pixel circuit that provides the driving current for the light emitting element, and the present invention does not impose any specific restrictions on this. Figure 8, which is a schematic structural diagram of a pixel circuit provided by an embodiment of the present invention, wherein the pixel circuit includes: a driving transistor T1, a reset transistor T2, a data writing transistor T3, a connecting transistor T4, a first light emission control transistor T5, a second light emission control transistor T6, an electrode reset transistor T7, and a storage capacitor C. The gate of the driving transistor T1 is electrically connected to the second end of the reset transistor T2, the second end of the connecting transistor T4, and the second end of the storage capacitor C; the first end of the driving transistor T1 is electrically connected to the second end of the first light emission control transistor T5 and the second end of the data writing transistor T3; and the second end of the driving transistor T1 is electrically connected to the first end of the connecting transistor T4 and the first end of the second light emission control transistor T6.

[0050] A first terminal of the reset transistor T2 is connected to a first reset voltage Vref1, and a gate of the reset transistor T2 is connected to a first scan control signal S1; a first terminal of the data write transistor T3 is connected to a data voltage Vdata, and a gate of the data write transistor T3 is connected to a second scan control signal S2, where the data voltage Vdata can be provided by a data signal line; a gate of the connection transistor T4 is connected to a third scan control signal S3, where the second scan control signal S2 and the third scan control signal S3 can be the same control signal; a first terminal of the first light-emitting control transistor T5 and a first terminal of the storage capacitor C are both connected to a first power supply voltage PVDD, the gate of the first light-emitting control transistor T5 is connected to a light-emitting control signal EM, a second terminal of the second light-emitting control transistor T6 is electrically connected to the anode of the light-emitting element D, and the gate of the second light-emitting control transistor T6 is connected to the light-emitting control signal EM; a first terminal of the electrode reset transistor T7 is connected to a second reset voltage Vref2, a second terminal of the electrode reset transistor T7 is electrically connected to the anode of the light-emitting element D, and a gate of the electrode reset transistor T7 is connected to a fourth scan control signal S4, where the first scan control signal S1 and the fourth scan control signal S4 can be the same control signal; and a cathode of the light-emitting element D is connected to a second power supply voltage PVEE. The first reset voltage Vref1 and the second reset voltage Vref2 may be the same reset voltage.

[0051] In one embodiment of the present invention, all transistors in the first pixel circuit provided by the present invention may be P-type transistors or N-type transistors, and the present invention does not impose any specific limitation on this. Figure 8 As shown, the embodiment of the present invention is described as an example in which all transistors are P-type transistors, and the working process of each transistor in the reset phase M1, data writing phase M2 and light emitting phase M3 of the pixel circuit can be specifically referred to. Figure 9 The timing diagram is shown.

[0052] In the reset phase M1, the first scan control signal S1 and the fourth scan control signal S4 are enabled to a low level to control the reset transistor T2 and the electrode reset transistor T2 to turn on respectively, and transmit the respective reset voltages to the gate of the driving transistor T1 and the anode of the light-emitting element D for reset.

[0053] In the data writing phase M2, the second scanning control signal S2 and the third scanning control signal S3 are enabled to a low level to control the data writing transistor T3 and the connecting transistor T4 to be turned on respectively, and the data voltage Vdata is transmitted to the gate of the driving transistor T1 through the data writing transistor T3, the driving transistor T1 and the connecting transistor T4.

[0054] In the light-emitting stage M3, the light-emitting control signal EM is enabled to a low level to control the first light-emitting control transistor T5 and the second light-emitting control transistor T6 to be turned on, and the driving current generated by the driving transistor T1 is transmitted to the light-emitting element D, and the light-emitting element D lights up in response to the driving current.

[0055] It should be noted that the present invention is not limited to the above Figure 8 The pixel circuit structure shown in the figure may also be a pixel circuit with other components and connections in other embodiments of the present invention, and the present invention does not impose any specific limitation on this.

[0056] In one embodiment of the present invention, in order to set the charging efficiency of the first light-emitting element and the second light-emitting element to be different, the channel widths of the driving transistors of the pixel circuits connected to the respective light-emitting elements can be set to the same, while the channel lengths of the driving transistors of the pixel circuits connected to the respective light-emitting elements can be set to different. That is, the display panel provided by the embodiment of the present invention includes a plurality of pixel circuits, each of which is electrically connected to the light-emitting element; the pixel circuit includes a driving transistor for providing a driving current to the light-emitting element; wherein the pixel circuit electrically connected to the first light-emitting element is a first pixel circuit, and the pixel circuit electrically connected to the second light-emitting element is a second pixel circuit, and the channel length of the driving transistor of the first pixel circuit is different from the channel length of the driving transistor of the second pixel circuit.

[0057] It can be understood that the embodiment of the present invention can make the resistance of the driving transistors of the two pixel circuits different by setting the channel length of the driving transistor of the first pixel circuit to be different from the channel length of the driving transistor of the second pixel circuit. The driving transistor with smaller resistance can generate a larger driving current, and thus can charge the light-emitting element faster and light it up, thereby compensating for the fluctuation of the light output of the subsequently lit light-emitting element, improving the problem of unstable brightness of the first type of light-emitting element due to the large change rate of the luminous efficiency with the driving current, and improving the light output stability of the first color light, thereby improving the display effect of the entire screen of the display device.

[0058] Optionally, the channel length of the driving transistor of the first pixel circuit provided by the present invention is smaller than the channel length of the driving transistor of the second pixel circuit; and the ratio of the channel length of the driving transistor of the second pixel circuit to the channel length of the driving transistor of the pixel circuit electrically connected to the second type of light-emitting element is in the range of 0.95-1.05.

[0059] It can be understood that the embodiment of the present invention sets the channel length of the driving transistor of the first pixel circuit to be smaller than the channel length of the driving transistor of the second pixel circuit, so that the charging efficiency of the first light-emitting element connected to the first pixel circuit is greater than the charging efficiency of the second light-emitting element connected to the second pixel circuit. As a result, the first light-emitting element can be preferentially lit to compensate for the light emission fluctuations of the second light-emitting element that is subsequently lit, thereby improving the light emission stability of the first color light, thereby improving the display effect of the entire screen of the display device. In addition, the channel length of the driving transistor of the second pixel circuit is set to a ratio range of 0.95-1.05 to the channel length of the driving transistor of the pixel circuit electrically connected to the second type of light-emitting element, so that the charging efficiency of the second light-emitting element is basically consistent with the charging efficiency of the second type of light-emitting element, ensuring that the overall light emission time of the first type of light-emitting element and the second type of light-emitting element is basically consistent, ensuring a high display effect of the display device.

[0060] It should be noted that in order to improve the display effect of the display device and avoid the problem that the light output of the first type of light emitting element still fluctuates greatly when the light output of the second type of light emitting element is stable, the embodiment of the present invention can set the channel length of the driving transistor of the pixel circuit connected to the first type of light emitting element to be smaller than the channel length of the driving transistor of the pixel circuit electrically connected to the second type of light emitting element. The present invention does not impose specific restrictions on this.

[0061] In one embodiment of the present invention, the present invention can also improve the storage capacitor, and set the capacitance of the first pixel circuit and the second pixel circuit to different capacities. That is, the display panel provided by the embodiment of the present invention includes a plurality of pixel circuits, and the pixel circuits are electrically connected to the light-emitting elements; the pixel circuits include a driving transistor for providing a driving current to the light-emitting elements, and a storage capacitor electrically connected to the gate of the driving transistor; wherein the pixel circuit electrically connected to the first light-emitting element is a first pixel circuit, and the pixel circuit electrically connected to the second light-emitting element is a second pixel circuit, and the capacitance of the storage capacitor of the first pixel circuit is different from the capacitance of the storage capacitor of the second pixel circuit.

[0062] It can be understood that the embodiment of the present invention can increase the charging and discharging speed of the storage capacitor with small capacity by setting the capacitance of the storage capacitor of the first pixel circuit to be smaller than the capacitance of the storage capacitor of the second pixel circuit, thereby improving the charging efficiency of the light-emitting element, thereby compensating for the fluctuation of the light output of the subsequently lit light-emitting element, improving the problem of unstable brightness of the first type of light-emitting element due to the large change in the luminous efficiency with the driving current, and improving the light output stability of the first color light, thereby improving the display effect of the entire screen of the display device.

[0063] In one embodiment of the present invention, the present invention can achieve the purpose of setting different capacities of the storage capacitor of the first pixel circuit and the storage capacitor of the second pixel circuit by improving the relative area of the capacitor plates. Figure 10 FIG. 1 is a structural diagram of another display panel provided by an embodiment of the present invention, wherein Figure 4 Based on the panel shown, the transistor array layer of the display panel further includes a capacitor metal layer 260 located between the interlayer insulating layer 240 and the source-drain metal layer, and a capacitor insulating layer 270 located between the capacitor metal layer 260 and the source-drain metal layer. The capacitor metal layer 260 includes a plate constituting a storage capacitor; and the other plate of the storage capacitor can be made of a gate metal layer. The relative area of the plates in the storage capacitor C1 of the first pixel circuit is different from the relative area of the plates in the storage capacitor C2 of the second pixel circuit, resulting in different capacities of the storage capacitor C1 of the first pixel circuit and the storage capacitor C2 of the second pixel circuit.

[0064] It should be noted that the embodiments of the present invention utilize a capacitor metal layer and a gate metal layer to form the two plates of the storage capacitor. This is not a specific limitation of the present invention, and other metal layers may be used in other embodiments. Furthermore, in other embodiments of the present invention, different capacities of different storage capacitors can be achieved by modifying the relative spacing between the two plates of the capacitor. This requires specific design based on the actual application.

[0065] In one embodiment of the present invention, the capacity of the storage capacitor of the first pixel circuit provided by the present invention is smaller than the capacity of the storage capacitor of the second pixel circuit; and the ratio of the capacity of the storage capacitor of the second pixel circuit to the capacity of the storage capacitor of the pixel circuit electrically connected to the second type light-emitting element is in the range of 0.95-1.05.

[0066] It can be understood that the embodiment of the present invention sets the capacity of the storage capacitor of the first pixel circuit to be smaller than the capacity of the storage capacitor of the second pixel circuit, so that the charging efficiency of the first light-emitting element connected to the first pixel circuit is greater than the charging efficiency of the second light-emitting element connected to the second pixel circuit. As a result, the first light-emitting element can be preferentially lit to compensate for the light emission fluctuations of the second light-emitting element that is subsequently lit, thereby improving the light emission stability of the first color light, thereby improving the display effect of the entire screen of the display device. In addition, the capacity of the storage capacitor of the second pixel circuit is set to a ratio range of 0.95-1.05 to the capacity of the storage capacitor of the pixel circuit electrically connected to the second type of light-emitting element, so that the charging efficiency of the second light-emitting element is basically consistent with the charging efficiency of the second type of light-emitting element, ensuring that the overall light emission time of the first type of light-emitting element and the second type of light-emitting element is basically consistent, ensuring a high display effect of the display device.

[0067] It should be noted that in order to improve the display effect of the display device and avoid the problem that the light output of the first type of light emitting element still fluctuates greatly when the light output of the second type of light emitting element is stable, the embodiment of the present invention can set the capacity of the storage capacitor of the pixel circuit connected to the first type of light emitting element to be smaller than the capacity of the storage capacitor of the pixel circuit electrically connected to the second type of light emitting element. The present invention does not impose specific restrictions on this.

[0068] In one embodiment of the present invention, the present invention can also improve the channel lengths of the data input transistor and the connecting transistor in the pixel circuit to achieve the purpose of different charging efficiencies for the first light-emitting element and the second light-emitting element. That is, the display panel provided by the embodiment of the present invention includes a plurality of pixel circuits, and the pixel circuits are electrically connected to the light-emitting elements; the pixel circuits include a driving transistor for providing a driving current to the light-emitting elements, and a data input transistor and a connecting transistor electrically connected to the driving transistor, the data input transistor being configured to transmit a data voltage to a first end of the driving transistor, and the connecting transistor being configured to control the connection between the gate of the driving transistor and the second end of the driving transistor; wherein the pixel circuit electrically connected to the first light-emitting element is a first pixel circuit, and the pixel circuit electrically connected to the second light-emitting element is a second pixel circuit, the channel length of the data input transistor of the first pixel circuit is different from the channel length of the data input transistor of the second pixel circuit; and / or the channel length of the connecting transistor of the first pixel circuit is different from the channel length of the connecting transistor of the second pixel circuit.

[0069] It can be understood that the embodiment of the present invention sets the channel length of the data input transistor and the connecting transistor of the first pixel circuit to be different from the channel length of the data input transistor and the connecting transistor of the second pixel circuit, which is equivalent to changing the resistance of the path between the data voltage transmitted to the gate of the driving transistor, so that the size of the data voltage transmitted to the gate of the driving transistor in the first pixel circuit and the second pixel circuit is different, thereby being able to change the size of the driving current generated by the driving transistor, thereby achieving the purpose of improving the charging efficiency of the first light-emitting element and the second light-emitting element, and improving the display effect of the entire screen of the display device.

[0070] Optionally, the channel length of the data input transistor of the first pixel circuit provided by the present invention is smaller than the channel length of the data input transistor of the second pixel circuit; and the ratio of the channel length of the data input transistor of the second pixel circuit to the channel length of the data input transistor of the pixel circuit electrically connected to the second type light-emitting element is in the range of 0.95-1.05; and / or the channel length of the connection transistor of the first pixel circuit is smaller than the channel length of the connection transistor of the second pixel circuit; and the channel length of the connection transistor of the second pixel circuit to the channel length of the connection transistor of the pixel circuit electrically connected to the second type light-emitting element is in the range of 0.95-1.05.

[0071] It can be understood that in the embodiment of the present invention, by setting the channel length of the data input transistor and the connecting transistor of the first pixel circuit to be smaller than the channel length of the data input transistor and the connecting transistor of the second pixel circuit, the charging efficiency of the first light-emitting element connected to the first pixel circuit is greater than the charging efficiency of the second light-emitting element connected to the second pixel circuit. As a result, the light output of the first light-emitting element compensates for the light output fluctuation of the second light-emitting element, thereby improving the light output stability of the first color light, thereby improving the display effect of the entire screen of the display device. In addition, the channel length of the data input transistor and the connecting transistor of the second pixel circuit are respectively set to a ratio of the channel length of the data input transistor and the connecting transistor of the pixel circuit electrically connected to the second type of light-emitting element in the range of 0.95-1.05, so that the charging efficiency of the second light-emitting element is substantially consistent with the charging efficiency of the second type of light-emitting element, ensuring that the overall light output time of the first type of light-emitting element and the second type of light-emitting element is substantially consistent, and ensuring a high display effect of the display device.

[0072] It should be noted that in order to improve the display effect of the display device and avoid the problem that the light output of the first type light emitting element still fluctuates greatly when the light output of the second type light emitting element is stable, the embodiment of the present invention can set the channel length of the data input transistor of the pixel circuit connected to the first type light emitting element to be smaller than the channel length of the data input transistor of the pixel circuit electrically connected to the second type light emitting element; and / or, set the channel length of the connection transistor of the pixel circuit connected to the first type light emitting element to be smaller than the channel length of the connection transistor of the pixel circuit electrically connected to the second type light emitting element. The present invention does not impose any specific restrictions on this.

[0073] In one embodiment of the present invention, the present invention can also improve the electrode reset transistor to achieve the purpose of different charging efficiencies for the first light-emitting element and the second light-emitting element. That is, the display panel provided in the embodiment of the present invention includes a plurality of pixel circuits, and the pixel circuits are electrically connected to the light-emitting elements; the pixel circuits include a driving transistor for providing a driving current to the light-emitting elements, and an electrode reset transistor electrically connected to a first end of the light-emitting element, the first end of the light-emitting element being used to receive the driving current; wherein the pixel circuit electrically connected to the first light-emitting element is a first pixel circuit, and the pixel circuit electrically connected to the second light-emitting element is a second pixel circuit, and the channel width of the electrode reset transistor of the first pixel circuit is different from the channel width of the electrode reset transistor of the second pixel circuit.

[0074] It can be understood that the channel width of the electrode reset transistor of the first pixel circuit provided in the embodiment of the present invention is set to be different from the channel width of the electrode reset transistor of the second pixel circuit, which is equivalent to changing the off-state voltage of the electrode reset transistor. The off-state voltage of the electrode reset transistor with a small channel width becomes smaller, thereby reducing its leakage current, so that the leakage current at the first end of the light-emitting element is reduced during the lighting process, and then the charging efficiency of the light-emitting element can be correspondingly improved, thereby achieving the purpose of improving the difference in charging efficiency between the first light-emitting element and the second light-emitting element, and improving the display effect of the entire screen of the display device.

[0075] refer to Figure 11 FIG2 is a schematic diagram of an active region structure according to an embodiment of the present invention, wherein the channel length according to the embodiment of the present invention is the extension dimension L of the active region M of the transistor between the source S1 and the drain D1 of the transistor, and the channel width is the distance W between the two sides of the active region M extending along the channel length of the transistor. It can be understood that by changing the channel length of the transistor, the resistance of the transistor can be changed; and by changing the trench width of the transistor, the off-state voltage of the transistor can be changed.

[0076] Optionally, the channel width of the electrode reset transistor of the first pixel circuit provided in an embodiment of the present invention is smaller than the channel width of the electrode reset transistor of the second pixel circuit; and the ratio of the channel width of the electrode reset transistor of the second pixel circuit to the channel width of the electrode reset transistor of the pixel circuit electrically connected to the second type of light-emitting element is in the range of 0.95-1.05.

[0077] It can be understood that in the embodiment of the present invention, by setting the channel width of the electrode reset transistor of the first pixel circuit to be smaller than the channel width of the electrode reset transistor of the second pixel circuit, the charging efficiency of the first light-emitting element connected to the first pixel circuit is greater than the charging efficiency of the second light-emitting element connected to the second pixel circuit. As a result, the light emission of the first light-emitting element compensates for the light emission fluctuation of the second light-emitting element, thereby improving the light emission stability of the first color light and improving the display effect of the entire screen of the display device. In addition, the channel width of the electrode reset transistor of the second pixel circuit is set to a ratio range of 0.95-1.05 to the channel width of the electrode reset transistor of the pixel circuit electrically connected to the second type light-emitting element, so that the charging efficiency of the second light-emitting element is substantially consistent with the charging efficiency of the second type light-emitting element, ensuring that the overall light emission time of the first type light-emitting element and the second type light-emitting element is substantially consistent, and ensuring a high display effect of the display device.

[0078] It should be noted that in order to improve the display effect of the display device and avoid the problem that the light output of the first type of light emitting element still fluctuates greatly when the light output of the second type of light emitting element is stable, the embodiment of the present invention can set the channel width of the electrode reset transistor of the pixel circuit connected to the first type of light emitting element to be smaller than the channel width of the electrode reset transistor of the pixel circuit electrically connected to the second type of light emitting element. The present invention does not impose specific restrictions on this.

[0079] Correspondingly, an embodiment of the present invention further provides a display device, which includes the display panel provided by any one of the above embodiments.

[0080] refer to Figure 12 , which is a schematic structural diagram of a display device provided by an embodiment of the present invention, wherein the display device 1000 provided by an embodiment of the present invention may be a mobile terminal device.

[0081] Optionally, the display device provided by the present invention may also be an electronic display device such as a computer, a wearable display device, etc., and the present invention does not impose any specific limitation on this.

[0082] An embodiment of the present invention provides a display panel and a display device, wherein the display panel includes: a plurality of light-emitting elements, wherein the light-emitting elements include a first type of light-emitting element that generates a first color of light, and a second type of light-emitting element that generates a second color of light; under the same conditions, the rate of change of the luminous efficiency of the first type of light-emitting element with a change in driving current is greater than that of the second type of light-emitting element; the first type of light-emitting element includes a first light-emitting element and a second light-emitting element, and the first light-emitting element and the second light-emitting element have different charging efficiencies.

[0083] From the above content, it can be seen that the technical solution provided by the embodiment of the present invention sets the charging efficiency of the first light-emitting element and the second light-emitting element to be different, and then the light output of the light-emitting element that is preferentially lit and stabilized among the first light-emitting element and the second light-emitting element can be used to compensate for the fluctuation of the light output of the light-emitting element that is subsequently lit. This improves the problem of unstable brightness of the first type of light-emitting element due to the large change in the luminous efficiency with the driving current, improves the light output stability of the first color light, avoids the color deviation problem that occurs when the display device switches the screen, and ensures that the display effect of the display device is high.

[0084] In the description of the present invention, it should be understood that the orientations or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0085] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0086] In the present invention, unless otherwise specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication between them; direct connections or indirect connections through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0087] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0088] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0089] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A display panel, characterized in that: include: a plurality of light-emitting elements, the light-emitting elements including a first type of light-emitting elements that generate light of a first color, and a second type of light-emitting elements that generate light of a second color; Under the same conditions, the luminous efficiency of the first type of light emitting element varies more with the driving current than that of the second type of light emitting element; The first type of light-emitting element includes a first light-emitting element and a second light-emitting element, and the charging efficiency of the first light-emitting element and the second light-emitting element is different, wherein at least one second light-emitting element is arranged around the first light-emitting element, and the first light-emitting element and the second light-emitting element are distributed in the entire display area of the display panel.

2. The display panel according to claim 1, wherein: The display panel includes scan lines extending along a first direction and data lines extending along a second direction; In the first direction and / or the second direction, at least one second light-emitting element is included between two adjacent first light-emitting elements.

3. The display panel according to claim 1, wherein: The light emitting element comprises an anode, a light emitting layer and a cathode stacked in sequence; The area of the anode of the first light-emitting element is different from the area of the anode of the second light-emitting element.

4. The display panel according to claim 3, wherein: The area of the anode of the first light-emitting element is smaller than the area of the anode of the second light-emitting element; Furthermore, a ratio of an area of the anode of the second light-emitting element to an area of the anode of the second-type light-emitting element is in a range of 0.95-1.

05.

5. The display panel according to claim 3, wherein: The area of the anode of the first light-emitting element and the area of the anode of the second light-emitting element are both smaller than the area of the anode of the second-type light-emitting element.

6. The display panel according to claim 1, wherein: The display panel includes a plurality of pixel circuits, and the pixel circuits are electrically connected to the light emitting elements; The pixel circuit includes a driving transistor for providing a driving current to the light emitting element; Among them, the pixel circuit electrically connected to the first light-emitting element is a first pixel circuit, the pixel circuit electrically connected to the second light-emitting element is a second pixel circuit, and the channel length of the driving transistor of the first pixel circuit is different from the channel length of the driving transistor of the second pixel circuit.

7. The display panel according to claim 6, wherein: A channel length of the driving transistor of the first pixel circuit is smaller than a channel length of the driving transistor of the second pixel circuit; Furthermore, a ratio of a channel length of a driving transistor of the second pixel circuit to a channel length of a driving transistor of a pixel circuit electrically connected to the second type light-emitting element is in a range of 0.95-1.

05.

8. The display panel according to claim 1, wherein: The display panel includes a plurality of pixel circuits, and the pixel circuits are electrically connected to the light emitting elements; The pixel circuit includes a driving transistor for providing a driving current to the light emitting element, and a storage capacitor electrically connected to a gate of the driving transistor; Among them, the pixel circuit electrically connected to the first light-emitting element is a first pixel circuit, the pixel circuit electrically connected to the second light-emitting element is a second pixel circuit, and the capacity of the storage capacitor of the first pixel circuit is different from the capacity of the storage capacitor of the second pixel circuit.

9. The display panel according to claim 8, wherein: The capacity of the storage capacitor of the first pixel circuit is smaller than the capacity of the storage capacitor of the second pixel circuit; Furthermore, a ratio of the capacity of the storage capacitor of the second pixel circuit to the capacity of the storage capacitor of the pixel circuit electrically connected to the second type light-emitting element is in a range of 0.95-1.

05.

10. The display panel according to claim 1, wherein The display panel includes a plurality of pixel circuits, and the pixel circuits are electrically connected to the light emitting elements; The pixel circuit includes a driving transistor for providing a driving current for the light-emitting element, and a data input transistor M2 and a connecting transistor M4 electrically connected to the driving transistor, wherein the data input transistor is used to transmit a data voltage to a first terminal of the driving transistor, and the connecting transistor is used to control the connection between the gate of the driving transistor and the second terminal of the driving transistor; Among them, the pixel circuit electrically connected to the first light-emitting element is a first pixel circuit, the pixel circuit electrically connected to the second light-emitting element is a second pixel circuit, the channel length of the data input transistor of the first pixel circuit is different from the channel length of the data input transistor of the second pixel circuit; and / or the channel length of the connection transistor of the first pixel circuit is different from the channel length of the connection transistor of the second pixel circuit.

11. The display panel according to claim 10, wherein: The channel length of the data input transistor of the first pixel circuit is smaller than the channel length of the data input transistor of the second pixel circuit; and the ratio of the channel length of the data input transistor of the second pixel circuit to the channel length of the data input transistor of the pixel circuit electrically connected to the second type light-emitting element is in a range of 0.95-1.05; And / or, the channel length of the connecting transistor of the first pixel circuit is smaller than the channel length of the connecting transistor of the second pixel circuit; and the ratio of the channel length of the connecting transistor of the second pixel circuit to the channel length of the connecting transistor of the pixel circuit electrically connected to the second type light-emitting element is in the range of 0.95-1.

05.

12. The display panel according to claim 1, wherein The display panel includes a plurality of pixel circuits, and the pixel circuits are electrically connected to the light emitting elements; The pixel circuit includes a driving transistor for providing a driving current to the light-emitting element, and an electrode reset transistor electrically connected to a first terminal of the light-emitting element, the first terminal of the light-emitting element being used to receive the driving current; Among them, the pixel circuit electrically connected to the first light-emitting element is a first pixel circuit, the pixel circuit electrically connected to the second light-emitting element is a second pixel circuit, and the channel width of the electrode reset transistor of the first pixel circuit is different from the channel width of the electrode reset transistor of the second pixel circuit.

13. The display panel according to claim 12, wherein: A channel width of the electrode reset transistor of the first pixel circuit is smaller than a channel width of the electrode reset transistor of the second pixel circuit; Furthermore, a ratio of a channel width of the electrode reset transistor of the second pixel circuit to a channel width of the electrode reset transistor of the pixel circuit electrically connected to the second type light emitting element is in a range of 0.95-1.

05.

14. A display device, characterized in that: The display device comprises the display panel according to any one of claims 1 to 13.

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