Pixel circuit, display screen and display device

Abstract

Embodiments of the present application provide a pixel circuit, a display screen and a display device, which are applied to the technical field of display, the pixel circuit comprises a plurality of sub-pixels and a driving circuit of each sub-pixel; the driving circuit of each sub-pixel comprises N sub-driving circuits; N is a positive integer; wherein: each sub-driving circuit of each first sub-pixel in each sub-pixel comprises a plurality of first sub-driving circuits; the first sub-driving circuit is a sub-driving circuit for providing a current to the sub-pixel; each sub-driving circuit of each second sub-pixel in each sub-pixel comprises a first sub-driving circuit and a second sub-driving circuit; the second sub-pixel is a sub-pixel other than the first sub-pixel in each sub-pixel, and the second sub-driving circuit is a virtual sub-driving circuit which does not provide a current to the sub-pixel. Through the scheme, the difficulty of Gamma adjustment of the display screen can be reduced without increasing the design difficulty of each layer of the display screen.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a pixel circuit, a display screen, and a display device. Background Technology

[0002] To meet the high current requirements of each sub-pixel in a large-size, low-PPI display, the driving circuit of a single sub-pixel often needs to include multiple sub-driving circuits. In related technologies, to reduce the design complexity of each layer of the display and to avoid damage to the display effect caused by uneven driving circuit structures in each sub-pixel, the driving circuit of each sub-pixel in a large-size, low-PPI display often includes the same number of sub-driving circuits; for example, each sub-pixel's driving circuit contains 9 sub-driving circuits.

[0003] However, for displays, different types of sub-pixels have different requirements for anode circuits, for example... Figure 2 In the example, the anode area of ​​the blue sub-pixel is larger than that of the red or green sub-pixels. Therefore, the anode circuit of the blue sub-pixel is required to be larger, while the anode circuit of the red or green sub-pixels is required to be smaller. If the driving circuit of each sub-pixel contains the same number of sub-driving circuits, this will result in a large difference in the brightness range displayed by different types of sub-pixels, which increases the difficulty of adjusting the gamma of the display.

[0004] Therefore, how to reduce the difficulty of adjusting the Gamma of the display screen without increasing the design complexity of each layer is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] The purpose of this invention is to provide a pixel circuit, a display screen, and a display device, so as to reduce the difficulty of adjusting the gamma of the display screen without increasing the design complexity of each layer of the display screen. The specific technical solution is as follows:

[0006] In a first aspect, embodiments of the present invention provide a pixel circuit, the pixel circuit comprising a plurality of sub-pixels and a driving circuit for each sub-pixel; each driving circuit for a sub-pixel comprises N sub-driving circuits; N is a positive integer; wherein:

[0007] Each sub-pixel of the sub-pixels includes a plurality of first sub-driving circuits; the first sub-driving circuit is a sub-driving circuit for providing current to the sub-pixel.

[0008] Each sub-driving circuit of each second sub-pixel in each sub-pixel includes a first sub-driving circuit and a second sub-driving circuit; the second sub-pixel is a sub-pixel other than the first sub-pixel in each sub-pixel, and the second sub-driving circuit is a virtual sub-driving circuit that does not provide current to the sub-pixel.

[0009] Optionally, each sub-driving circuit includes a power input terminal, an anode input terminal of the sub-pixel, and an intermediate device disposed between the power input terminal and the anode input terminal;

[0010] Each first sub-driving circuit includes an intermediate device called a first switching device, the input terminal of which is connected to the power input terminal, and the output terminal of which is connected to the anode input terminal.

[0011] Each second sub-drive circuit includes an intermediate device that is not connected to at least one of the power input terminal and the anode input terminal, and / or, each second sub-drive circuit includes an intermediate device that is a second switching device whose internal current transmission path is interrupted.

[0012] Optionally, the first switching device is a transistor comprising a first electrode, a second electrode, a polycrystalline material layer, a first connecting line connecting the first electrode and the polycrystalline material layer, and a second connecting line connecting the second electrode and the polycrystalline material layer.

[0013] Optionally, the second switching device is a transistor lacking at least one of the following components: a first electrode, a second electrode, a polycrystalline material layer, a first connection line connecting the first electrode and the polycrystalline material layer, and a second connection line connecting the second electrode and the polycrystalline material layer.

[0014] Optionally, the number of first sub-driving circuits in each sub-driving circuit of each second sub-pixel is proportional to the magnitude of the current required by the second sub-pixel.

[0015] Optionally, for each second sub-pixel, each sub-driving circuit of the second sub-pixel includes M first sub-driving circuits and L second sub-driving circuits; wherein, M+L=N, and M is greater than or equal to the ratio of the current required by the second sub-pixel to the current provided by the first sub-driving circuit.

[0016] Optionally, for any two second sub-pixels whose required current values ​​are similar, the number of first sub-driving circuits and second sub-driving circuits in each sub-driving circuit of the two second sub-pixels are the same.

[0017] Optionally, the similarity condition is that the relative deviation of the required current magnitude is greater than or equal to 0% and less than or equal to 25%.

[0018] Optionally, N is greater than or equal to the ratio of the current required by the first sub-pixel to the current provided by the first sub-driving circuit.

[0019] Optionally, N is the smallest positive integer greater than or equal to the ratio of the current required by the first sub-pixel to the current provided by the first sub-driving circuit.

[0020] In a second aspect, embodiments of the present invention provide a display screen, the display screen including the pixel circuit described in the first aspect.

[0021] Thirdly, embodiments of the present invention provide a display device, the display device including the display screen described in the second aspect.

[0022] Beneficial effects of the embodiments of the present invention:

[0023] This invention provides a pixel circuit, a display screen, and a display device. The pixel circuit includes multiple sub-pixels and driving circuits for each sub-pixel. Each driving circuit for a sub-pixel includes N sub-driving circuits, where N is a positive integer. Each first sub-pixel in each sub-pixel includes multiple first sub-driving circuits. Each first sub-driving circuit provides current to the sub-pixel. Each second sub-pixel in each sub-pixel includes both first and second sub-driving circuits. The second sub-pixel is any sub-pixel other than the first sub-pixel, and its second sub-driving circuit is a virtual sub-driving circuit that does not provide current to the sub-pixel. Because each sub-pixel's driving circuit in the pixel circuit includes the same number of N sub-driving circuits, the driving circuit structure of each sub-pixel is consistent, thereby reducing the design complexity of each layer of the display screen. Furthermore, because the second sub-pixel with lower current requirements includes virtual sub-driving circuits that do not provide current to the sub-pixel, the current of the second sub-pixel with lower current requirements is lower, which can improve the difference in brightness range displayed by different types of sub-pixels, thereby reducing the difficulty of adjusting the gamma of the display screen. It is evident that the technical solution of this invention can reduce the difficulty of adjusting the Gamma of the display screen without increasing the design complexity of each layer.

[0024] Of course, implementing any product or method of the present invention does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained based on these drawings.

[0026] Figure 1 This is a schematic diagram of a typical large-size display screen spliced ​​indoors;

[0027] Figure 2 A schematic diagram of an anode region provided in an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of a first pixel circuit provided in an embodiment of the present invention;

[0029] Figure 4 A schematic diagram of a driving circuit structure for a first sub-pixel provided in an embodiment of the present invention;

[0030] Figure 5 A schematic diagram of a driving circuit structure for a second sub-pixel provided in an embodiment of the present invention;

[0031] Figure 6 This is a connection diagram of a first sub-driving circuit provided in an embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the structure of a first switching device provided in an embodiment of the present invention;

[0033] Figure 8 This is a schematic diagram of a 7T1C circuit provided in an embodiment of the present invention;

[0034] Figure 9 This is a schematic diagram of a stacked structure of a first switching device provided in an embodiment of the present invention;

[0035] Figure 10 This is a connection diagram of the first type of second sub-driving circuit provided in an embodiment of the present invention;

[0036] Figure 11 A schematic diagram of a stacked structure of a second switching device in which the path between the current input node of the sub-pixel anode is cut off, provided for an embodiment of the present invention;

[0037] Figure 12 This is a connection diagram of the second type of second sub-driving circuit provided in an embodiment of the present invention;

[0038] Figure 13 This is a schematic diagram of the structure of a second switching device provided in an embodiment of the present invention;

[0039] Figure 14 This is a schematic diagram of a stacked structure of a second switching device lacking a second connection line, provided by an embodiment of the present invention.

[0040] Figure 15 This is a schematic diagram of the structure of a second pixel circuit provided in an embodiment of the present invention. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art based on the present invention are within the scope of protection of the present invention.

[0042] With the development of industries such as indoor and outdoor advertising, education, online conferencing, gaming, and VR (Virtual Reality), the demand for large-size displays is becoming increasingly strong. For example, Figure 1 The image shows a typical large-size display screen used for indoor splicing. Because the human eye is less sensitive to the PPI (Pixels Per Inch) of large-size displays, only a lower pixel density is needed to achieve the desired display effect. Therefore, most large-size displays on the market are low-PPI displays.

[0043] However, for large-size, low-PPI displays, due to their large size and low pixel density, large-area anodized designs are often used to ensure brightness and contrast. For example, such as... Figure 2 As shown in the figure, this embodiment of the invention provides an anode schematic diagram of a large-size, low-PPI display screen. In the diagram, block R represents the anode region of the red sub-pixel, block G represents the anode region of the green sub-pixel, and block B represents the anode region of the blue sub-pixel. Figure 2 As can be seen, the anodes of each sub-pixel area in large-size, low-PPI displays reach the millimeter level. Due to the large anode area, and the larger the anode area, the greater the current required to ensure the brightness and contrast of the sub-pixels.

[0044] To meet the high current requirements of each sub-pixel in large-size, low-PPI displays, the driving circuit of a single sub-pixel often needs to include multiple sub-driving circuits. In related technologies, to reduce the design complexity of each layer of the display and to avoid damage to the display effect caused by uneven driving circuit structures in each sub-pixel, the driving circuit of each sub-pixel in a large-size, low-PPI display often includes the same number of sub-driving circuits; for example, each sub-pixel's driving circuit contains 9 sub-driving circuits.

[0045] However, for displays, different types of sub-pixels have different requirements for anode circuits, for example... Figure 2In the example, the anode area of ​​the blue sub-pixel is larger than that of the red or green sub-pixels. Therefore, the anode circuit of the blue sub-pixel is required to be larger, while the anode circuit of the red or green sub-pixels is required to be smaller. If the driving circuit of each sub-pixel contains the same number of sub-driving circuits, this will result in a large difference in the brightness range displayed by different types of sub-pixels, which increases the difficulty of adjusting the gamma of the display.

[0046] Therefore, how to reduce the difficulty of adjusting the Gamma of the display screen without increasing the design complexity of each layer is a technical problem that urgently needs to be solved.

[0047] To solve the above technical problems, such as Figure 3 As shown, an embodiment of the present invention provides a pixel circuit 300, which includes a plurality of sub-pixels 301 and a driving circuit 302 for each sub-pixel. Each driving circuit 302 for each sub-pixel includes N sub-driving circuits; N is a positive integer.

[0048] Since each sub-pixel's driving circuit 302 contains N sub-driving circuits, it means that the structure of the driving circuits of each sub-pixel in the pixel circuit is the same, which can reduce the design difficulty of each layer of the display screen, such as reducing the design difficulty of the Poly (polycrystalline material) layer and the Gate (gate) layer in the display screen.

[0049] In one implementation, the pixel circuit may include multiple sub-pixels, including red (R) sub-pixels, green (G) sub-pixels, and blue (B) sub-pixels.

[0050] Furthermore, in this embodiment of the invention, the sub-pixels included in the pixel circuit are divided into first sub-pixels and second sub-pixels according to the required current. Under the same grayscale, the first sub-pixel is the sub-pixel requiring the largest current, and the second sub-pixel is the sub-pixel excluding the first sub-pixel. Taking multiple sub-pixels as red, green, and blue sub-pixels as an example, typically, since the luminous efficiency of blue sub-pixels is lower than that of red and green sub-pixels, it means that blue sub-pixels require a higher current for the same luminous intensity. Therefore, blue sub-pixels typically require a larger current. For example, Table 1 shows the current required by each sub-pixel in a large-size, low-PPI display screen:

[0051] Table 1

[0052] subpixel Red subpixel Green subpixel Blue subpixel Required current (mA) 195 150 300

[0053] As can be seen, the blue sub-pixel usually requires the most current. Therefore, in this example, the blue sub-pixel is the first sub-pixel, and the red and green sub-pixels are the second sub-pixels.

[0054] In this embodiment of the invention, since the number of sub-driving circuits included in the driving circuit of each sub-pixel is the same, but the current required by each sub-pixel is different, in order to improve the difference in brightness range displayed by different types of sub-pixels and thus reduce the difficulty of adjusting the gamma of the display screen, in this embodiment of the invention, the sub-driving circuits included in the driving circuits of the first sub-pixel and the second sub-pixel are different, specifically:

[0055] For each first sub-pixel, each sub-driving circuit of each first sub-pixel 301 includes multiple first sub-driving circuits; wherein, the first sub-driving circuit is a sub-driving circuit used to provide current to the sub-pixel. For example... Figure 4 As shown in the figure, an embodiment of the present invention provides a schematic diagram of a driving circuit structure for a first sub-pixel. The driving circuit for the first sub-pixel includes N first sub-driving circuits, namely, first sub-driving circuit 1 to first sub-driving circuit N. Each of the N first sub-driving circuits provides current to the first sub-pixel, so that the current input to the first sub-pixel is the sum of the currents provided by first sub-driving circuit 1 to first sub-driving circuit N.

[0056] For each second sub-pixel, each sub-driving circuit of each second sub-pixel in each sub-pixel 301 includes a first sub-driving circuit and a second sub-driving circuit; wherein, the second sub-driving circuit is a virtual sub-driving circuit that does not provide current to the sub-pixel. For example... Figure 5 As shown in the diagram, this embodiment of the invention provides a schematic diagram of a driving circuit structure for a second sub-pixel. The driving circuit for the second sub-pixel includes both a first sub-driving circuit and a second sub-driving circuit. Optionally, the driving circuit for the second sub-pixel includes M first sub-driving circuits and L second sub-driving circuits. The M first sub-driving circuits are designated as first sub-driving circuit 1 to first sub-driving circuit M, and the L second sub-driving circuits are designated as second sub-driving circuit 1 to second sub-driving circuit L, where M + L = N. Since the second sub-driving circuits are virtual sub-driving circuits that do not provide current to the sub-pixel, this means that only the first sub-driving circuits provide current to the second sub-pixel. In other words, only the M first sub-driving circuits provide current to the second sub-pixel, and the current input to the second sub-pixel is the sum of the currents provided by the first sub-driving circuits 1 to M.

[0057] Since the current input to the second sub-pixel is only provided by a portion of the N sub-driving circuits (the first sub-driving circuit), the current input to the second sub-pixel is smaller than that of the first sub-pixel. Therefore, in the pixel circuit provided in this embodiment of the invention, the current input to the first sub-pixel, which requires the largest current, is greater than that to the second sub-pixel, which requires the smallest current. This can improve the difference in brightness range displayed by different types of sub-pixels, thereby reducing the difficulty of adjusting the Gamma of the display screen.

[0058] Optionally, in one embodiment, the number of first sub-driving circuits in each sub-driving circuit of each second sub-pixel is proportional to the magnitude of the current required by the second sub-pixel. This means that for each second sub-pixel with a smaller current requirement, the number of first and second sub-driving circuits is different. Specifically, the second sub-pixel with a larger current requirement has more first sub-driving circuits and fewer second sub-driving circuits in its driving circuit. For example, in Table 1, both red and green sub-pixels are second sub-pixels, but the current required by the red sub-pixel (195mA) is greater than that required by the green sub-pixel (150mA). Therefore, the number of first sub-driving circuits in the driving circuit of the red sub-pixel is greater than that in the driving circuit of the green sub-pixel, and the number of second sub-driving circuits in the driving circuit of the red sub-pixel is less than that in the driving circuit of the green sub-pixel.

[0059] Since the number of first sub-driving circuits in each sub-driving circuit of the second sub-pixel is proportional to the current required by the second sub-pixel, the sub-pixel with a larger current requirement can also input a larger current. This can further improve the difference in brightness range displayed by different types of sub-pixels, and further reduce the difficulty of adjusting the Gamma of the display screen.

[0060] Specifically, for each second sub-pixel, each sub-driving circuit of the second sub-pixel includes M first sub-driving circuits and L second sub-driving circuits; wherein, M+L=N, and M is greater than or equal to the ratio of the current required by the second sub-pixel to the current provided by the first sub-driving circuit.

[0061] The current provided by the first sub-driving circuit can be the maximum current it can provide, and its specific value is determined according to the structure of the first sub-driving circuit. Given a fixed structure, the current it can provide is also fixed. Therefore, to ensure the second sub-pixel can display normally, the current input to the second sub-pixel needs to meet its normal display requirements; that is, the input current needs to be greater than or equal to the required current. Since the current provided by each sub-driving circuit is fixed, when M is greater than or equal to the ratio of the current required by the second sub-pixel to the current provided by the first sub-driving circuit, it can be ensured that the input current meets the requirements for normal display. Furthermore, if M is the smallest positive integer greater than or equal to the ratio of the current required by the second sub-pixel to the current provided by the first sub-driving circuit, it can ensure that the number N of the second sub-driving circuits is maximized while meeting the normal display requirements of the second sub-pixel. This maximizes the improvement of the brightness range differences displayed by different types of sub-pixels, thereby reducing the difficulty of adjusting the Gamma of the display screen.

[0062] Optionally, in one embodiment, when the required current of two second sub-pixels is not significantly different, to further reduce the design complexity of each layer of the display screen, the number of first sub-driving circuits in the driving circuits of the two second sub-pixels can be designed to be the same. In this case, for any two second sub-pixels whose required current magnitudes satisfy the similarity condition, the number of first and second sub-driving circuits in each sub-driving circuit of the two second sub-pixels is the same. Optionally, the above-mentioned similarity condition is that the relative deviation of the required current magnitudes is greater than or equal to 0% and less than or equal to 25%. That is, when the relative deviation of the required current magnitudes of two second sub-pixels is greater than or equal to 0% and less than or equal to 25%, the number of first and second sub-driving circuits in each sub-driving circuit of the two second sub-pixels is the same. The relative deviation is the percentage of the absolute deviation to the average value. If the required current magnitudes of the two second sub-pixels are A and B respectively, then the relative deviation between the two second sub-pixels is:

[0063] Optionally, in one embodiment, to ensure that the current input to the first sub-pixel with the largest required current can meet the normal display requirements of the first sub-pixel, it is necessary to ensure that the current input to the first sub-pixel is greater than or equal to the required current. Since the current provided by each sub-driving circuit is fixed, when N is greater than or equal to the ratio of the current required by the first sub-pixel to the current provided by the first sub-driving circuit, it can be ensured that the current input to the first sub-pixel can meet the normal display requirements of the first sub-pixel. Furthermore, to simplify the structure, the aforementioned N can be greater than or equal to the smallest positive integer of the ratio of the current required by the first sub-pixel to the current provided by the first sub-driving circuit, thereby ensuring that the normal display requirements of the first sub-pixel are met while maximizing the optimization of the driving circuit structure.

[0064] In one embodiment, each sub-driving circuit includes a power input terminal, an anode input terminal of the sub-pixel, and an intermediate device disposed between the power input terminal and the anode input terminal. The power input terminal is the endpoint for inputting power, and the anode input terminal is the current input endpoint for the anode of the sub-pixel.

[0065] In order for the first sub-driving circuit to provide current to the sub-pixel, such as Figure 6 As shown in the diagram, this embodiment of the invention provides a connection schematic of a first sub-driving circuit. Each first sub-driving circuit includes a first switching device as an intermediate component. The input terminal of the first switching device is connected to the power input terminal, and the output terminal of the first switching device is connected to the anode input terminal. Because the input terminal of the first switching device is connected to the power input terminal, and the output terminal of the first switching device is connected to the anode input terminal, the first switching device, when turned on, can transmit the current generated after the power input voltage is applied to the sub-pixel.

[0066] In one implementation, such as Figure 7 As shown in the diagram, this embodiment of the invention provides a structural schematic of a first switching device. The first switching device is a transistor comprising a first electrode, a second electrode, a polycrystalline material layer, a first connecting line connecting the first electrode and the polycrystalline material layer, and a second connecting line connecting the second electrode and the polycrystalline material layer. Optionally, each sub-driving circuit is a 7T1C (a circuit with 7 thin-film transistors and 1 capacitor), such as... Figure 8 As shown in the diagram, this embodiment of the invention provides a structural schematic of a 7T1C circuit, comprising seven thin-film transistors T1-T7 and one capacitor Cst. In this case, the transistors in the first sub-driving circuit can be... Figure 8The T6 thin-film transistor shown has a power input terminal of VDD and an anode input terminal that is the current input node for the sub-pixel anode. When the transistor is turned on, current flows in from the first terminal, passes through the first connection line to the polycrystalline material layer, then passes through the second connection line, and outputs from the second terminal. Optionally, the transistor is a thin-film transistor, in which case the first terminal can be the source, the second terminal can be the drain, and it may also include a control terminal, i.e., the gate in the thin-film transistor. Figure 9 As shown in the figure, this embodiment of the invention provides a schematic diagram of the stacked structure of a first switching device. In the figure, the two SD1s are the first electrode and the second electrode, respectively. The layer containing Poly (polycrystalline material) is a polycrystalline material layer. SD1 is connected to the Poly layer through a first connection line (SD1→CNT hole of Poly) and a second connection line (Poly→CNT hole of SD1) that crosses ILD (interlayer dielectric isolation layer), GI2 (second insulating layer), and GI1 (first insulating layer), forming a current transmission path. Among them, the CNT hole is a conductive via connecting different layers. In the figure, PS is a spacer, PDL is a pixel definition layer, Anode is an anode, PLN1-PLN2 are insulating layers, PVX is a protective layer, Barrier2+Buffer represents the second barrier layer and buffer layer, Barrier1 is the first barrier layer, PI1 and PI2 are polyimide layers, and GLS is a glass substrate.

[0067] Optionally, in order to make the second sub-driving circuit a virtual sub-driving circuit that does not provide current to the sub-pixel, in one implementation, such as Figure 10 As shown in the figure, an embodiment of the present invention provides a connection diagram of a second sub-driving circuit. Each second sub-driving circuit includes an intermediate device that is not connected to at least one of the power input terminal and the anode input terminal. As a result, the current generated after the power input terminal receives the voltage cannot be transmitted to the sub-pixel, so that the second sub-driving circuit cannot provide current to the sub-pixel.

[0068] For example, in the case where each sub-drive circuit is a 7T1C circuit, the fact that the intermediate devices are not connected to the power input terminal means... Figure 8 The path between the source and the power input terminal VDD of the T6 thin-film transistor is cut off, and the intermediate device is not connected to the anode input terminal, which means... Figure 8 The path between the drain of the T6 thin-film transistor and the anode current input node of the sub-pixel is cut off.

[0069] The following example illustrates this in detail: the path between the drain of a thin-film transistor and the anode current input node of a sub-pixel is cut off. Figure 11As shown in the figure, an embodiment of the present invention provides a stacked structure of a second switching device in which the path between the drain of a thin-film transistor and the current input node of the anode of a sub-pixel is cut off. In the figure, the connection line (CNT hole of SD1→SD2) between SD1 (second electrode) and SD2 (current input node of anode) on the right side is missing, which causes the current output from SD1 on the right side to be unable to be transmitted to the anode of the sub-pixel, resulting in the current transmission path being cut off, so that the second sub-driving circuit cannot provide current to the sub-pixel.

[0070] Optional, such as Figure 12 As shown in the diagram, this embodiment of the invention also provides a connection diagram of a second sub-driving circuit, wherein each second sub-driving circuit includes an intermediate device that is a second switching device whose internal current transmission path is interrupted. Because the internal current transmission path of the second switching device is interrupted, the current input from the power input terminal cannot be output to the anode input terminal of the sub-pixel, thus preventing the second sub-driving circuit from providing current to the sub-pixel. It should be noted that the above two methods can be used simultaneously, i.e., the intermediate device is a second switching device whose internal current transmission path is interrupted, and at least one of the terminals of the second switching device is not connected to the power input terminal or the anode input terminal.

[0071] In one implementation, the second switching device is a transistor lacking at least one of the following components: a first electrode, a second electrode, a polycrystalline material layer, a first connection line connecting the first electrode and the polycrystalline material layer, and a second connection line connecting the second electrode and the polycrystalline material layer. For example, the following description uses the lack of a second connection line between the second electrode and the polycrystalline material layer as an example. Figure 13 As shown in the schematic diagram, this embodiment of the invention provides a structural diagram of a second switching device. In this transistor, the second electrode and the second connection line between the second electrode and the polycrystalline material layer are missing. This causes current to flow in from the first electrode, and after reaching the polycrystalline material layer via the first connection line, it cannot flow out of the polycrystalline material layer, resulting in the current being unable to be transmitted to the sub-pixel. Figure 14 As shown in the figure, this embodiment of the invention provides a stacked structure diagram of a second switching device lacking a second connection line. In the figure, the second connection line connecting SD1 and Poly across ILD, GI2 and GI1 on the right is missing, which causes the current transmission path to be cut off, making it impossible for the second sub-driving circuit to provide current to the sub-pixel.

[0072] In one embodiment, such as Figure 15As shown in the diagram, this embodiment of the invention provides a schematic diagram of a pixel circuit. The pixel circuit includes three types of sub-pixels: red sub-pixels, green sub-pixels, and blue sub-pixels. Each sub-pixel's driving circuit includes nine sub-driving circuits. The driving circuit for the blue sub-pixel includes nine first sub-driving circuits, the driving circuit for the red sub-pixel includes six first sub-driving circuits and three second sub-driving circuits, and the driving circuit for the green sub-pixel includes five first sub-driving circuits and four second sub-driving circuits. In the diagram, Vinit is the reset signal line, Reset(i) is the reset control line, Gate(i) is the gate signal line, EM(i) is the light emission control line, ELVDD is the power supply line, and Data is the data line.

[0073] In another embodiment of the present invention, a display screen is also provided, which includes the pixel circuit provided in the embodiments of the present invention.

[0074] In another embodiment of the present invention, a display device is also provided, which includes the display screen provided in the embodiments of the present invention.

[0075] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0076] The various embodiments in this specification are described in a related manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the embodiments for the display screen and display device are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A pixel circuit, characterized in that, The pixel circuit includes multiple sub-pixels and driving circuits for each sub-pixel; each sub-pixel driving circuit contains N sub-driving circuits; N is a positive integer; where: Each sub-pixel of the sub-pixels includes a plurality of first sub-driving circuits; the first sub-driving circuit is a sub-driving circuit for providing current to the sub-pixel. Each sub-driving circuit of each second sub-pixel in each sub-pixel includes a first sub-driving circuit and a second sub-driving circuit; the second sub-pixel is a sub-pixel other than the first sub-pixel in each sub-pixel, and the second sub-driving circuit is a virtual sub-driving circuit that does not provide current to the sub-pixel.

2. The pixel circuit according to claim 1, characterized in that, Each sub-driving circuit includes a power input terminal, an anode input terminal of the sub-pixel, and an intermediate device disposed between the power input terminal and the anode input terminal; Each first sub-driving circuit includes an intermediate device called a first switching device, the input terminal of which is connected to the power input terminal, and the output terminal of which is connected to the anode input terminal. Each second sub-drive circuit includes an intermediate device that is not connected to at least one of the power input terminal and the anode input terminal, and / or, each second sub-drive circuit includes an intermediate device that is a second switching device whose internal current transmission path is interrupted.

3. The pixel circuit according to claim 2, characterized in that, The first switching device is a transistor comprising a first electrode, a second electrode, a polycrystalline material layer, a first connection line connecting the first electrode and the polycrystalline material layer, and a second connection line connecting the second electrode and the polycrystalline material layer.

4. The pixel circuit according to claim 2, characterized in that, The second switching device is a transistor lacking at least one of the following components: a first electrode, a second electrode, a polycrystalline material layer, a first connection line connecting the first electrode and the polycrystalline material layer, and a second connection line connecting the second electrode and the polycrystalline material layer.

5. The pixel circuit according to any one of claims 1-4, characterized in that, The number of first sub-driving circuits in each sub-driving circuit of the second sub-pixel is proportional to the amount of current required by the second sub-pixel.

6. The pixel circuit according to claim 5, characterized in that, For each second sub-pixel, each sub-driving circuit of the second sub-pixel includes M first sub-driving circuits and L second sub-driving circuits; wherein, M+L=N, and M is greater than or equal to the ratio of the current required by the second sub-pixel to the current provided by the first sub-driving circuit.

7. The pixel circuit according to any one of claims 1-4, characterized in that, For any two second sub-pixels whose required current values ​​are similar, the number of first and second sub-driving circuits in each of the two second sub-pixels is the same.

8. The pixel circuit according to claim 7, characterized in that, The similarity condition is that the relative deviation of the required current magnitude is greater than or equal to 0% and less than or equal to 25%.

9. The pixel circuit according to any one of claims 1-4, characterized in that, N is greater than or equal to the ratio of the current required by the first sub-pixel to the current provided by the first sub-driving circuit.

10. The pixel circuit according to claim 9, characterized in that, N is the smallest positive integer greater than or equal to the ratio of the current required by the first sub-pixel to the current provided by the first sub-driving circuit.

11. A display screen, characterized in that, The display screen includes the pixel circuitry according to any one of claims 1-10.

12. A display device, characterized in that, The display device includes the display screen as described in claim 11.

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