Display panel and display device

Abstract

The invention discloses a display panel and a display device. The display panel comprises a substrate, a pixel circuit and a shielding metal layer, the pixel circuits are arranged on one side of the substrate, the plurality of pixel circuits comprise a first pixel circuit and a second pixel circuit, the first pixel circuit comprises a first transistor, and the second pixel circuit comprises a second transistor; the shielding metal layer is located between the substrate and the pixel circuit, the shielding metal layer comprises a first shielding part and a second shielding part which are arranged at an interval, and the orthographic projection of the first shielding part on the substrate and the orthographic projection of the first transistor on the substrate are at least partially overlapped; the orthographic projection of the second shielding part on the substrate is at least partially overlapped with the orthographic projection of the second transistor on the substrate; wherein the first shielding part is configured to access a first fixed potential, the second shielding part is configured to access a second fixed potential, and the first fixed potential is different from the second fixed potential. The use performance of the display panel can be improved.

Description

Technical Field

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

[0002] Organic Light Emitting Diode (OLED) and flat panel display devices based on technologies such as Light Emitting Diode (LED) have been widely used in various consumer electronic products such as mobile phones, televisions, laptops, desktop computers, etc. due to their advantages such as high image quality, power saving, thin body and wide application range, becoming the mainstream in display devices.

[0003] However, the performance of current OLED display products needs to be improved. Summary of the invention

[0004] The embodiments of the present application provide a display panel and a display device, aiming to improve the performance of OLED display products.

[0005] In a first aspect, an embodiment of the present application provides a display panel, which includes a substrate, a pixel circuit and a shielding metal layer; the pixel circuit is arranged on one side of the substrate, and the plurality of pixel circuits include a first pixel circuit and a second pixel circuit, the first pixel circuit includes a first transistor, and the second pixel circuit includes a second transistor; the shielding metal layer is located between the substrate and the pixel circuit, and the shielding metal layer includes a first shielding portion and a second shielding portion that are spaced apart, the orthographic projection of the first shielding portion on the substrate at least partially overlaps with the orthographic projection of the first transistor on the substrate, and the orthographic projection of the second shielding portion on the substrate at least partially overlaps with the orthographic projection of the second transistor on the substrate; wherein the first shielding portion is configured to be connected to a first fixed potential, and the second shielding portion is configured to be connected to a second fixed potential, and the first fixed potential is different from the second fixed potential.

[0006] According to an implementation of the first aspect of the present application, the first fixed potential is greater than the second fixed potential, and the threshold voltage of the first transistor is lower than the threshold voltage of the second transistor.

[0007] According to any of the aforementioned embodiments of the first aspect of the present application, the display panel also includes a light-emitting pixel layer, which is arranged on the side of the pixel circuit away from the substrate, and the light-emitting pixel layer includes a first light-emitting device and a second light-emitting device, the first transistor is electrically connected to the first light-emitting device, and the second transistor is electrically connected to the second light-emitting device.

[0008] According to any of the aforementioned embodiments of the first aspect of the present application, the first light-emitting device includes a blue light-emitting device, and the second light-emitting device includes a red light-emitting device and / or a green light-emitting device.

[0009] According to any of the aforementioned embodiments of the first aspect of the present application, the orthographic projection of the channel region of the first transistor on the substrate is located within the orthographic projection of the first shielding portion on the substrate.

[0010] According to any of the aforementioned embodiments of the first aspect of the present application, the display panel further includes a first potential signal line and a second potential signal line, the first potential signal line is electrically connected to the first shielding portion, and the second potential signal line is electrically connected to the second shielding portion.

[0011] According to any of the aforementioned implementations of the first aspect of the present application, the first potential signal line is a high-level switching voltage signal line, and the second potential signal line is a high-level power supply voltage signal line.

[0012] According to any of the aforementioned embodiments of the first aspect of the present application, there are multiple first shielding parts and first transistors, each first shielding part is arranged corresponding to each first transistor, and the multiple first shielding parts are electrically connected to each other; and / or, there are multiple second shielding parts and second transistors, each second shielding part is arranged corresponding to each second transistor, and the multiple second shielding parts are electrically connected to each other.

[0013] According to any of the aforementioned embodiments of the first aspect of the present application, the display panel also includes a bridging metal layer, which is located on the side of the shielding metal layer away from the substrate, and the bridging metal layer includes a bridge connection portion, and the bridge connection portion vias connect multiple first shielding portions.

[0014] According to any of the aforementioned embodiments of the first aspect of the present application, the plurality of second shielding portions are electrically connected to each other within the same film layer.

[0015] According to any of the aforementioned embodiments of the first aspect of the present application, the first potential signal line is arranged in the same layer as the jumper metal layer.

[0016] According to any of the aforementioned embodiments of the first aspect of the present application, the first transistor is a driving transistor of the first pixel circuit, and the second transistor is a driving transistor of the second pixel circuit.

[0017] According to any of the aforementioned embodiments of the first aspect of the present application, the orthographic projection of the first transistor on the substrate is located within the orthographic projection of the first shielding portion on the substrate, and the orthographic projection of the second transistor on the substrate is located within the orthographic projection of the second shielding portion on the substrate.

[0018] An embodiment of a second aspect of the present application provides a display device, which includes a display panel according to any of the above embodiments.

[0019] According to the display panel of the embodiment of the present application, the display panel includes a substrate, a pixel circuit and a shielding metal layer. The shielding part overlapping with the positive projection of the transistor on the substrate can change the characteristics of the corresponding transistor, that is, the first shielding part can change the characteristics of the first transistor, and the second shielding part can change the characteristics of the second transistor. Since the access potentials of the first shielding part and the second shielding part are different, when the display panel is turned on, the potentials of the first shielding part and the second shielding part are different, and the effects on the first transistor and the second transistor are also different, so that the threshold voltage Vth of the first transistor can be positively biased or negatively biased relative to the threshold voltage of the second transistor, and then the currents of different luminous pixels can be different while maintaining the same voltage cross-voltage for different luminous pixels, so as to achieve differentiated settings, so as to be well matched with luminous pixels with different current requirements. Compared with the related art, the embodiment of the present application can use a smaller power supply cross-voltage to achieve the required luminous pixel current, so that the power supply cross-voltage of the display panel is smaller under the same display brightness, thereby effectively reducing the power consumption of the screen body and improving the endurance and performance of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present application will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings, in which the same or similar reference numerals represent the same or similar features and the accompanying drawings are not drawn to scale.

[0021] Figure 1 is a structural schematic diagram of a display panel provided in an embodiment of the present application;

[0022] Figure 2 is a schematic diagram of a partial cross-sectional structure of a display panel provided in an embodiment of the present application;

[0023] Figure 3 This is one of the schematic diagrams of the layout structure of a display panel provided in an embodiment of the present application;

[0024] Figure 4 This is the second schematic diagram of the layout structure of a display panel provided in an embodiment of the present application.

[0025] Description of reference numerals:

[0026] AA, display area; NA, non-display area;

[0027] 1. substrate; 11. first potential signal line; 12. second potential signal line; 13. jumper metal layer;

[0028] 2. pixel circuit; 21. first pixel circuit; 211. first transistor; 22. second pixel circuit; 221. second transistor;

[0029] 3. Shielding metal layer; 31. First shielding part; 32. Second shielding part;

[0030] 4. Light-emitting pixel layer; 41. First light-emitting device; 42. Second light-emitting device. DETAILED DESCRIPTION

[0031] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present application and are not configured to limit the present application. For those skilled in the art, 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 the examples of the present application.

[0032] It should be noted that, 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 existence of other identical elements in the process, method, article or device including the elements.

[0033] It should be understood that when describing the structure of a component, when a layer or a region is referred to as being "on" or "over" another layer or another region, it may mean that it is directly on the other layer or another region, or that other layers or regions are included between it and the other layer or another region. Moreover, if the component is turned over, the layer or a region will be "below" or "beneath" another layer or another region.

[0034] In some display devices, battery life is a core indicator, such as mobile phones, and reducing the power consumption of the display screen is an important direction of attention. The pixel circuits of the luminous pixels of the display screen are uniformly designed in the relevant technology, but the current required by different color pixels to achieve the same brightness is not consistent. Under the same power supply voltage, in order to achieve a better display effect, the actual power supply voltage needs to meet the voltage requirement of the luminous pixel with the highest demand. Such a design will increase the power consumption of other luminous pixels, becoming a bottleneck restricting the reduction of power consumption, and reducing the battery life and performance of the display device.

[0035] In order to solve the above problems, embodiments of the present application provide a display panel and a display device. Embodiments of the display panel and the display device will be described below in conjunction with the accompanying drawings.

[0036] An embodiment of the present application provides a display panel, which may be an organic light emitting diode (OLED) display panel.

[0037] See also Figure 1 and Figure 2 , Figure 1 A schematic diagram of the structure of a display panel provided in an embodiment of the present application is shown; Figure 2 A partial cross-sectional structural schematic diagram of a display panel provided in an embodiment of the present application is shown.

[0038] like Figure 1 and Figure 2 As shown, an embodiment of the first aspect of the present application provides a display panel, which includes a substrate 1, a pixel circuit 2 and a shielding metal layer 3; the pixel circuit 2 is arranged on one side of the substrate 1, and the plurality of pixel circuits 2 include a first pixel circuit 21 and a second pixel circuit 22, the first pixel circuit 21 includes a first transistor 211, and the second pixel circuit 22 includes a second transistor 221; the shielding metal layer 3 is located between the substrate 1 and the pixel circuit 2, and the shielding metal layer 3 includes a first shielding portion 31 and a second shielding portion 32 that are spaced apart, the orthographic projection of the first shielding portion 31 on the substrate 1 at least partially overlaps with the orthographic projection of the first transistor 211 on the substrate 1, and the orthographic projection of the second shielding portion 32 on the substrate 1 at least partially overlaps with the orthographic projection of the second transistor 221 on the substrate 1; wherein the first shielding portion 31 is configured to be connected to a first fixed potential, and the second shielding portion 32 is configured to be connected to a second fixed potential, and the first fixed potential is different from the second fixed potential.

[0039] The substrate 1 may be a flexible substrate or a rigid substrate. The substrate 1 may support various components of the display panel. A buffer layer may be provided on one side of the substrate 1. The buffer layer may be used to protect a functional layer of a thin film transistor (TFT) from impurities such as alkali ions leaking from the substrate 1 or a lower layer. The buffer layer may be made of silicon oxide (SiOx), silicon nitride (SiNx) or a multilayer thereof. The shielding metal layer 3 may be provided on the side of the buffer layer facing away from the substrate 1.

[0040] The shielding metal layer 3 may be a back side metal film (BSM) for shielding and reducing electromagnetic wave interference. Meanwhile, the shielding metal layer 3 may also improve the characteristics of the thin film transistor.

[0041] The display panel includes a display area AA and a non-display area NA, the pixel circuit 2 and the shielding metal layer 3 are located in the display area AA, and the shielding metal layer 3 can receive a predetermined voltage during the time period when the display panel is turned on. The predetermined voltage can be 2.5 volts (V) or higher. The shielding metal layer 3 can be connected to a potential signal line located in the non-display area NA. In the embodiment of the present application, the voltage of the potential signal line connected to the first shielding portion 31 and the second shielding portion 32 is different, that is, the BSM potential difference setting under the transistor corresponding to different light-emitting pixels.

[0042] In addition, the shielding metal layer 3 may also receive a ground voltage (eg, 0 V) ​​during a period when the display panel is turned off.

[0043] According to the display panel of the embodiment of the present application, the display panel includes a substrate 1, a pixel circuit 2 and a shielding metal layer 3, and the shielding part overlapping with the positive projection of the transistor on the substrate 1 can change the characteristics of the corresponding transistor, that is, the first shielding part 31 can change the characteristics of the first transistor 211, and the second shielding part 32 can change the characteristics of the second transistor 221. Since the access potentials of the first shielding part 31 and the second shielding part 32 are different, when the display panel is turned on, the potentials of the first shielding part 31 and the second shielding part 32 are different, and the effects on the first transistor 211 and the second transistor 221 are also different, so that the threshold voltage Vth of the first transistor 211 can be positively biased or negatively biased relative to the threshold voltage of the second transistor 221, and then the currents of different luminous pixels can be different while maintaining the same voltage cross-voltage for different luminous pixels, so as to achieve differentiated settings, so as to be well matched with luminous pixels with different current requirements. Compared with the related art, the embodiment of the present application can use a smaller power supply cross-voltage to achieve the required luminous pixel current, so that the power supply cross-voltage of the display panel is smaller under the same display brightness, thereby effectively reducing the power consumption of the screen body and improving the battery life and performance of the display device.

[0044] The power supply voltage can be understood as the voltage difference between ELVDD and ELVSS of the display panel.

[0045] In some optional embodiments, the orthographic projection of the channel region of the first transistor 211 on the substrate 1 is located within the orthographic projection of the first shielding portion 31 on the substrate 1. The electric field effect formed by the first shielding portion 31 will affect the channel region of the first transistor 211 and the gate located on the side of the channel region of the first transistor 211 away from the first shielding portion, thereby changing the electrical properties of the first transistor 211. The orthographic projection of the channel region of the first transistor 211 on the substrate 1 is located within the orthographic projection of the first shielding portion 31 on the substrate 1. This arrangement can make the first shielding portion 31 have better effects on shielding, protecting and changing the electrical properties of the channel region of the first transistor 211.

[0046] In the same principle, the orthographic projection of the channel region of the second transistor 221 on the substrate 1 may also be located within the orthographic projection of the second shielding portion 32 on the substrate 1 , which will not be elaborated here.

[0047] Optionally, the first transistor 211 is a driving transistor of the first pixel circuit 21, and the second transistor 221 is a driving transistor of the second pixel circuit 22. Since the shielding metal layer 3 and the positive projection of the driving transistor on the substrate 1 at least partially overlap, the electric field effect formed by the shielding metal layer 3 will affect the channel region of the driving transistor, and the gate located on the side of the channel region away from the shielding metal layer 3, thereby changing the electrical properties of the driving transistor. Since the first shielding portion 31 under the first transistor 211 and the second shielding portion 32 under the second transistor 221 have different potentials, the threshold voltages Vth of the two will be different. The corresponding relationship is that if the potential of the first shielding portion 31 is more positive than the potential of the second shielding portion 32, the threshold voltage of the first transistor 211 will be more negative than the threshold voltage of the second transistor 221. Keeping the same power supply voltage across, the current of the luminous pixel connected to the first transistor 211 can be effectively increased.

[0048] Optionally, the first fixed potential is greater than the second fixed potential, and the threshold voltage of the first transistor 211 is lower than the threshold voltage of the second transistor 221 .

[0049] In the related art, the BSM shielding potential under the driving TFT of different light-emitting pixels is kept consistent. The driving TFT of the light-emitting pixels has the same electrical properties and the same threshold voltage Vth.

[0050] In these embodiments, starting from the potential differentiation design direction of the shielding metal layer 3, the threshold voltages of the driving transistors corresponding to different light-emitting pixels are regulated, so that the threshold voltages of the driving transistors corresponding to the light-emitting pixels requiring large currents can be relatively negatively biased, so that at the same display brightness, the power supply voltage across the display panel can be designed to be smaller, thereby effectively reducing the power consumption of the screen and improving the battery life and performance of the display device.

[0051] In some optional embodiments, the orthographic projection of the first transistor 211 on the substrate 1 is located within the orthographic projection of the first shielding portion 31 on the substrate 1, and the orthographic projection of the second transistor 221 on the substrate 1 is located within the orthographic projection of the second shielding portion 32 on the substrate 1. In the direction perpendicular to the substrate 1, the entire area of ​​the first transistor 211 is covered by the first shielding portion 31. The orthographic projection of the second transistor 221 on the substrate 1 is covered by the second shielding portion 32. This arrangement helps to protect the transistor from external interference or damage and improve the stability and reliability of the circuit.

[0052] Reference Figure 2In some optional embodiments, the display panel further includes a light-emitting pixel layer 4, which is disposed on a side of the pixel circuit 2 away from the substrate 1, and the light-emitting pixel layer 4 includes a first light-emitting device 41 and a second light-emitting device 42, a first transistor 211 is electrically connected to the first light-emitting device 41, and a second transistor 221 is electrically connected to the second light-emitting device 42. Optionally, the first light-emitting device 41 and the second light-emitting device 42 have different luminous colors, and the required currents for normal luminous brightness of different luminous colors are different. These embodiments can achieve differentiated settings for the pixel currents of the first light-emitting device 41 and the second light-emitting device 42, so as to be well adapted to light-emitting devices with different current requirements, so as to reduce the power consumption and performance of the display panel.

[0053] Exemplarily, each light-emitting device may include a first electrode, a light-emitting unit, and a second electrode stacked in sequence in a direction away from the substrate 1, wherein one of the first electrode and the second electrode may be used as an anode, and the other may be used as a cathode to drive the light-emitting unit to emit light. In the embodiment of the present application, the first electrode is used as the anode of the display panel, and the second electrode is used as the cathode of the display panel. The driving transistor includes an active layer, a source and a drain, and a gate. The first electrode may be electrically connected to one of the source and drain of the driving transistor. ELVDD may be electrically connected to the other of the source and drain to power the light-emitting device through ELVDD.

[0054] The light-emitting unit may include one or more of a hole injection layer (HIL), a hole transport layer (HTL), an electron blocking layer, an emitting layer (EML), a hole blocking layer, an electron injection layer (EIL) and an electron transport layer (ETL).

[0055] In the related art, when a white image is normally displayed, the driving current demand of the blue light-emitting device is the largest. Compared with the red light-emitting device or the green light-emitting device, the blue light-emitting device also requires the largest power supply voltage, which becomes the bottleneck of reducing the power supply voltage. In order to match the normal light emission of the blue light-emitting device, a larger power supply voltage is required, resulting in a large power consumption of the screen.

[0056] Optionally, the first light emitting device 41 includes a blue light emitting device, and the second light emitting device 42 includes a red light emitting device and / or a green light emitting device.

[0057] In these embodiments, the threshold voltage of the driving transistor of the blue light-emitting device is more negatively biased than the threshold voltage of the driving transistor of the red light-emitting device and / or the green light-emitting device, thereby effectively increasing the current of the blue light-emitting device, so that under the same display brightness, the power supply voltage can be designed to be smaller, thereby effectively reducing the power consumption of the display panel.

[0058] Figure 3 One of the schematic diagrams of the layout structure of a display panel provided in an embodiment of the present application is shown.

[0059] Reference Figure 3 In some optional embodiments, the display panel further includes a first potential signal line 11 and a second potential signal line 12, the first potential signal line 11 is electrically connected to the first shielding portion 31, and the second potential signal line 12 is electrically connected to the second shielding portion 32. The first potential signal line 11 and the second potential signal line 12 may be located in the non-display area NA of the display panel. The first potential signal line 11 provides a first fixed potential for the first shielding portion 31, and the second potential signal line 12 provides a second fixed potential for the second shielding portion 32. The potentials of the first potential signal line 11 and the second potential signal are different.

[0060] Optionally, the first potential signal line 11 is a high-level switching voltage signal line PVGH, and the second potential signal line 12 is a high-level power supply voltage signal line ELVDD.

[0061] The potential of PVGH is higher than the potential of ELVDD.

[0062] PVGH (Pixel Voltage High) and ELVDD (Emission Line Voltage for Data Driver) are two common signals in a display panel and have different potentials, which facilitates providing differentiated potentials for the shielding metal layer 3 .

[0063] PVGH refers to a high voltage power line in the pixel circuit 2. It is mainly used to provide the high level voltage required by the TFT or other components inside the pixel circuit 2. This voltage can control the light-emitting pixel to be turned on or off correctly. In short, PVGH is a key voltage source for controlling the pixel state.

[0064] ELVDD refers to the emission line voltage provided to the data driver, which is mainly used to power the light-emitting device. When the organic light-emitting material receives current, it will emit light, and ELVDD is one of the key voltages used to adjust the magnitude of these currents. By accurately controlling the ELVDD voltage level, the brightness of the OLED can be finely adjusted to achieve the ideal display effect.

[0065] Figure 4A second schematic diagram of the layout structure of a display panel provided in an embodiment of the present application is shown.

[0066] Combined with reference Figure 3 and Figure 4 In some optional embodiments, there are multiple first shielding parts 31 and first transistors 211, each first shielding part 31 is arranged corresponding to each first transistor 211, and multiple first shielding parts 31 are electrically connected to each other. Such an arrangement can make the potentials of multiple / all first shielding parts 31 in the display area AA consistent without difference, thereby making the threshold voltages of the first transistors 211 corresponding to the first shielding parts 31 consistent, and the currents of the same type of light-emitting pixels consistent, thereby reducing the uneven display of the light-emitting brightness of the same type of light-emitting pixels at different positions. Exemplarily, one first shielding part 31 can correspond to one blue light-emitting device.

[0067] Optionally, there are multiple second shielding parts 32 and second transistors 221, each second shielding part 32 is arranged corresponding to each second transistor 221, and multiple second shielding parts 32 are electrically connected to each other. This arrangement can make the potentials of multiple / all second shielding parts 32 in the display area AA consistent without difference, thereby making the threshold voltages of the second transistors 221 corresponding to the second shielding parts 32 consistent, and the currents of the same type of light-emitting pixels consistent, thereby reducing the uneven display of the light-emitting brightness of the same type of light-emitting pixels at different positions. Exemplarily, one second shielding part 32 can correspond to a red light-emitting device or a green light-emitting device.

[0068] One of the multiple first shielding parts 31 and the multiple second shielding parts 32 can be connected to each other in the same film layer to make the potential consistent, and it is convenient to connect the potential signal line from the periphery of the display area AA. Due to the interference of the shielding parts set in the same layer, the other one needs to be connected to other metal layers through vias to achieve mutual electrical connection and maintain the same potential. In the R / G / B light-emitting display panel, the number of blue light-emitting devices is usually less than the sum of the number of red light-emitting devices and green light-emitting devices. Therefore, the first shielding part 31 corresponding to the blue light-emitting device can be selected to be connected to other metal layers, which has less impact on the layout of the film layer.

[0069] Optionally, the display panel further includes a bridging metal layer 13, the bridging metal layer 13 is located on the side of the shielding metal layer 3 away from the substrate 1, and the bridging metal layer 13 includes a bridge connection portion, and the bridge connection portion vias connect multiple first shielding portions 31. Optionally, the bridging metal layer 13 can be arranged at the same layer as the source and drain of the driving transistor.

[0070] In these embodiments, the plurality of first shielding portions 31 are connected to the cross-metal layer 13 via the bridge connection portion to maintain a consistent potential, and the plurality of first shielding portions 31 are distributed at intervals in the same film layer.

[0071] Exemplarily, the first shielding portion 31 may be electrically connected to the PVGH at the periphery of the display area AA, or the bridging metal layer 13 may be electrically connected to the PVGH at the periphery of the display area AA.

[0072] Optionally, the plurality of second shielding parts 32 are electrically connected to each other in the same film layer. The plurality of second shielding parts 32 are electrically connected to each other in the same film layer to maintain the same potential, and the plurality of second shielding parts 32 can be arranged in a single-layer metal mesh.

[0073] Exemplarily, the second shielding portion 32 may be electrically connected to ELVDD at the periphery of the display area AA.

[0074] Optionally, the first potential signal line 11 is arranged in the same layer as the jumper metal layer 13. This arrangement facilitates the electrical connection between the first potential signal line 11 and the jumper metal layer 13, simplifies circuit design, reduces connection lines and connection points between circuit elements, reduces connection complexity between circuit elements, and improves circuit stability and reliability.

[0075] The embodiment of the present application controls the idea of ​​differential electrical design of the driving transistor of the blue light-emitting device by differentially designing the BSM potential under the driving transistor of the blue light-emitting device. The BSM potential corresponding to the blue light-emitting device is more positively biased than that of the red light-emitting device and / or the green light-emitting device (exemplary: the blue light-emitting device is connected to the PVGH potential, and the red light-emitting device and / or the green light-emitting device is connected to the ELVDD potential), thereby changing the electrical properties of the driving transistor of the blue light-emitting device, so that the threshold voltage of the driving transistor of the blue light-emitting device is more negatively biased than the threshold voltage of the driving transistor of the red light-emitting device and / or the green light-emitting device. Maintaining the same power supply voltage, the current of the blue light-emitting device can be effectively increased. The embodiment of the present application can use a smaller power supply voltage to achieve the required current of the blue light-emitting device, thereby effectively reducing the power consumption of the screen.

[0076] The embodiment of the second aspect of the present application further provides a display device, comprising the display panel of any of the above embodiments. Since the display device provided by the embodiment of the second aspect of the present application comprises the display panel of any of the above embodiments, the display device provided by the embodiment of the second aspect of the present application has the beneficial effects of the display panel of any of the above embodiments, which will not be described in detail here.

[0077] The display device in the embodiments of the present application includes but is not limited to mobile phones, personal digital assistants (PDAs), tablet computers, e-books, televisions, access control systems, smart landline phones, consoles, and other devices with display functions.

[0078] According to the embodiments described above, these embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can make good use of the present application and the modifications based on the present application. The present application is limited only by the claims and their full scope and equivalents.

Claims

1. A display panel, characterized in that: include: substrate; A pixel circuit is arranged on one side of the substrate, wherein the plurality of pixel circuits include a first pixel circuit and a second pixel circuit, wherein the first pixel circuit includes a first transistor, and the second pixel circuit includes a second transistor; a shielding metal layer, located between the substrate and the pixel circuit, the shielding metal layer comprising a first shielding portion and a second shielding portion arranged at intervals, an orthographic projection of the first shielding portion on the substrate at least partially overlapping with an orthographic projection of the first transistor on the substrate, and an orthographic projection of the second shielding portion on the substrate at least partially overlapping with an orthographic projection of the second transistor on the substrate; The first shielding portion is configured to be connected to a first fixed potential, and the second shielding portion is configured to be connected to a second fixed potential, and the first fixed potential is different from the second fixed potential.

2. The display panel according to claim 1, characterized in that: The first fixed potential is greater than the second fixed potential, and a threshold voltage of the first transistor is lower than a threshold voltage of the second transistor; Preferably, the display panel further includes: a light-emitting pixel layer, arranged on a side of the pixel circuit away from the substrate, the light-emitting pixel layer comprising a first light-emitting device and a second light-emitting device, the first transistor being electrically connected to the first light-emitting device, and the second transistor being electrically connected to the second light-emitting device; Preferably, the first light-emitting device includes a blue light-emitting device, and the second light-emitting device includes a red light-emitting device and / or a green light-emitting device.

3. The display panel according to claim 1, characterized in that: An orthographic projection of a channel region of the first transistor on the substrate is located within an orthographic projection of the first shielding portion on the substrate.

4. The display panel according to claim 1, characterized in that: The display panel further includes a first potential signal line and a second potential signal line, the first potential signal line is electrically connected to the first shielding portion, and the second potential signal line is electrically connected to the second shielding portion; Preferably, the first potential signal line is a high-level switching voltage signal line, and the second potential signal line is a high-level power supply voltage signal line.

5. The display panel according to claim 4, characterized in that: There are a plurality of first shielding parts and a plurality of first transistors, each first shielding part is arranged corresponding to each first transistor, and the plurality of first shielding parts are electrically connected to each other; And / or, there are multiple second shielding parts and multiple second transistors, each second shielding part is arranged corresponding to each second transistor, and the multiple second shielding parts are electrically connected to each other.

6. The display panel according to claim 5, characterized in that: The display panel further includes a bridging metal layer, the bridging metal layer is located on a side of the shielding metal layer away from the substrate, the bridging metal layer includes a bridging connection portion, and the bridging connection portion is connected to a plurality of the first shielding portions via holes; Preferably, a plurality of the second shielding parts are electrically connected to each other in the same film layer.

7. The display panel according to claim 6, characterized in that: The first potential signal line is arranged in the same layer as the jumper metal layer.

8. The display panel according to any one of claims 1 to 7, characterized in that: The first transistor is a driving transistor of the first pixel circuit, and the second transistor is a driving transistor of the second pixel circuit.

9. The display panel according to any one of claims 1 to 7, characterized in that: The orthographic projection of the first transistor on the substrate is located within the orthographic projection of the first shielding portion on the substrate, and the orthographic projection of the second transistor on the substrate is located within the orthographic projection of the second shielding portion on the substrate.

10. A display device, characterized in that: A display panel comprising any one of claims 1 to 9.

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