PIXEL CIRCUIT, DISPLAY PANEL AND DISPLAY DEVICE

Abstract

The present application relates to an image circuit (40), a display panel (1, 10), and a display device (100). The image circuit (40) includes a control unit (50), a light-emitting unit (60), and a driving unit (70). The control unit (50) controls a first light-emitting element (A) and / or a second light-emitting element (B) of the light-emitting unit (60) to be electrically connected to a first power source ELVSS and emit light. In the image circuit (40) of the present application, the first light-emitting element (A) and the second light-emitting element (B) are provided. The control unit (50) controls one light-emitting element of the light-emitting unit (60) to emit light and the other light-emitting element to receive a second cathode voltage to release the accumulated charge therein, thereby extending the display life of the light-emitting unit (60) and reducing the risk of burn-in.

Description

[Technical field]

[0001] REFERENCE TO RELATED APPLICATIONS This application claims priority to Chinese Patent Application No. 202211145865.8, filed on September 20, 2022, entitled "Pixel Circuit, Display Panel and Display Device," the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the field of display technology, and in particular to a pixel circuit, a display panel including the pixel circuit, and a display device including the display panel. [Background technology]

[0003] With the development of display technology, market demands for display effects and quality of display devices are increasing. In the current market, a DC driving method is widely adopted for organic light-emitting diode (OLED) displays. However, in a DC driving method, OLEDs accumulate excess carriers that are not recombined at the interface between the hole transport layer and the light emitting layer or the interface between the light emitting layer and the electron transport layer. When the number of these excess carriers that are not recombined accumulates to a certain extent, a built-in field is formed inside. However, the formed built-in field makes it difficult to inject carriers in the next cycle, which in turn reduces the recombination rate, thereby affecting the display quality and display life of OLED displays. Summary of the Invention

[0004] The present application aims to provide a pixel circuit, a display panel, and a display device. In the pixel circuit, a first light-emitting element and a second light-emitting element are provided. The control unit selectively controls the first light-emitting element and / or the second light-emitting element to emit light, and controls the first light-emitting element or the second light-emitting element to receive a second cathode voltage, thereby causing the first light-emitting element to release its internally accumulated charge when not emitting light, or causing the second light-emitting element to release its internally accumulated charge when not emitting light, thereby further extending the display life of the light-emitting unit. Thus, the risk of burn-in is reduced and the display quality is improved.

[0005] In a first aspect, the present application provides a pixel circuit. The pixel circuit includes a light-emitting unit, a driving unit, and a control unit. The light-emitting unit includes a first light-emitting element and a second light-emitting element, and the first light-emitting element and the second light-emitting element are both electrically connected to the driving unit and the control unit simultaneously. The driving unit is configured to transmit a data signal to the light-emitting unit for driving the first light-emitting element and / or the second light-emitting element to emit light. The control unit is configured to control the first light-emitting element and / or the second light-emitting element to be electrically connected to a first power source. When the light-emitting unit receives the data signal, the control unit selectively controls the first light-emitting element and / or the second light-emitting element to emit light.

[0006] In a second aspect, the present application provides a display panel including a number of the pixel circuits described above.

[0007] In a third aspect, the present application provides a display device including the display panel described above.

[0008] In summary, in the pixel circuit, display panel, and display device of the present application, a control unit is provided in the pixel circuit, and a first light-emitting element and a second light-emitting element are provided in the light-emitting unit. The control unit selectively controls the first light-emitting element and / or the second light-emitting element to emit light, thereby extending the display life of the pixel circuit. At the same time, the control unit selectively controls the second end of the first light-emitting element or the second end of the second light-emitting element to be electrically connected to a second power source and receive a second cathode voltage, thereby causing the first light-emitting element to release its internally accumulated charge when not emitting light, or causing the second light-emitting element to release its internally accumulated charge when not emitting light, thereby further extending the display life of the light-emitting unit. Thus, the risk of burn-in is reduced and the display quality is improved.

[0009] In addition, a total control unit is provided in the display panel. Some pixel circuits in the display panel are controlled in blocks, and a total control unit is provided for each display block, so that the total control unit simultaneously switches the light-emitting elements used for display for a pixel circuit in which a display abnormality has occurred, thereby further improving the efficiency of controlling the display effect. [Brief description of the drawings]

[0010] In order to more clearly describe the technical solutions of the embodiments of the present application or the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings by these drawings without creative efforts. [Figure 1] FIG. 1 is a schematic diagram showing a configuration of a display device according to an embodiment of the present application. [Diagram 2] FIG. 2 is a schematic diagram showing a configuration of a display panel in the display device shown in FIG. [Diagram 3] FIG. 3 is a schematic diagram showing a configuration of a pixel unit in the display panel shown in FIG. [Figure 4] FIG. 4 is a schematic diagram showing a circuit configuration of a pixel circuit according to an embodiment of the present application. [Diagram 5] FIG. 5 is a schematic diagram showing a specific circuit configuration of the pixel circuit shown in FIG. [Figure 6] FIG. 6 is a schematic diagram showing a circuit configuration of a control unit in the pixel circuit shown in FIG. [Figure 7] FIG. 7 is an operation timing chart of the pixel circuit shown in FIG. [Figure 8] FIG. 8 is a schematic diagram of another display panel according to an embodiment of the present application. [Figure 9] FIG. 9 is a timing chart of control signals transmitted by the general control unit in the display panel shown in FIG. [Figure 10] FIG. 10 shows addresses corresponding to each control unit in the display panel shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] In order to facilitate the understanding of the present application, the present application will now be described more completely with reference to the associated drawings. Preferred embodiments of the present application are illustrated in the drawings. However, the present application may be embodied in many different forms and is not limited to the embodiments set forth herein. These embodiments are provided in order to provide a more thorough and complete understanding of the present application.

[0012] The following description of the embodiments refers to the accompanying drawings for illustrating specific embodiments in which the present application can be implemented. In the present application, the numbers themselves attached to components such as "first" and "second" are used only to distinguish the objects being described and have no order or technical meaning. In addition, "connection" and "coupling" described in the present application include direct and indirect connection (coupling) unless otherwise specified. Directional terms such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", and "side" described in the present application are directions shown based on the accompanying drawings. Therefore, the directional terms used are used only to better and more clearly explain and understand the present application, and do not indicate or imply that the described devices or components must have a specific orientation, be configured and operate in a specific orientation. Therefore, the present application cannot be understood as being limited.

[0013] In the description of this application, the terms "attached", "connected", and "coupled" should be understood in a broad sense unless otherwise expressly specified and limited. For example, it may be a fixed connection, a detachable connection, or an integral connection. It may be a mechanical connection. It may be a direct connection, an indirect connection through an intermediate medium, or an internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific situation. Note that the terms "first", "second", and the like in the specification, claims, and drawings of this application are intended to distinguish different objects, and are not intended to describe a specific order. Furthermore, the terms "comprise", "may comprise", "include", or "may include" used in this application mean the presence of the corresponding functions, operations, elements, etc. disclosed, and do not limit one or more other additional functions, operations, elements, etc. Furthermore, the term "comprises" or "includes" means the presence of the corresponding features, numbers, steps, operations, elements, components, or combinations thereof disclosed in the specification, and is intended to cover non-exclusively, without excluding the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof. Also, unless otherwise specifically limited, it should be understood that the meaning of "at least one" described in this application means one or more, such as one, two, or three, and the meaning of "plurality" means at least two, such as two or three. The terms "step 1", "step 2", and the like in the specification, claims, and drawings of this application are used to distinguish different objects, and are not used to describe a particular order.

[0014] Referring to FIG. 1, FIG. 1 is a schematic diagram showing a configuration of a display device 100 according to an embodiment of the present application. As shown in FIG. 1, the display device 100 according to an embodiment of the present application may include at least a display panel 10, a power supply module 20, and a support frame 30. The display panel 10 is fixed to the support frame 30. The power supply module 20 is provided on the rear surface of the display panel 10, i.e., on the non-display surface of the display panel 10, i.e., on one side of the display panel 10 away from the user. The display panel 10 is for displaying images, the power supply module 20 is electrically connected to the display panel 10 and for supplying a power supply voltage to the image display of the display panel 10, and the support frame 30 is for supporting and protecting the display panel 10 and the power supply module 20.

[0015] As can be seen, the display panel 10 further includes a display surface provided on a front side of the display panel 10, i.e., a side of the display panel 10 facing a user, opposite a non-display surface. The display surface is for displaying an image facing a user using the display device 100.

[0016] Also referring to Fig. 2, Fig. 2 is a schematic diagram showing a configuration of the display panel 10 in the display device 100 shown in Fig. 1. As shown in Fig. 2, the display panel 10 has a display area 11 and a non-display area 13. The display area 11 is used for displaying images, and the non-display area 13 is disposed around and surrounding the display area 11 and is not used for displaying images. As can be understood, in some embodiments, the display panel 10 may use a liquid crystal material as a display medium, but is not limited thereto.

[0017] In the embodiment of the present application, a plurality of scan lines extending along a first direction F1 and a plurality of data lines extending along a second direction F2 are arranged in a lattice pattern inside the display panel 10. The first direction F1 and the second direction F2 are orthogonal to each other (see FIG. 5), and the plurality of scan lines, the plurality of data lines, and the scan lines and the data lines are insulated from each other. That is, the plurality of scan lines are arranged in parallel with a gap along the second direction F2 and are insulated from each other, the plurality of data lines are arranged in parallel with a gap along the first direction F1 and are insulated from each other, and the plurality of scan lines and the plurality of data lines are insulated from each other.

[0018] At the intersections of the multiple scanning lines and the multiple data lines, pixel circuits 40 (see FIG. 4) are provided correspondingly. Specifically, a pixel circuit 40 is provided between any two adjacent scanning lines and any two adjacent data lines. All pixel circuits 40 located in the same column are electrically connected to the same single data line, and all pixel circuits 40 located in the same row are electrically connected to the same single scanning line. In the embodiment of the present application, the multiple pixel circuits 40 are arranged in an array.

[0019] Also referring to FIG. 3, FIG. 3 is a schematic diagram showing a configuration of a pixel unit in the display panel 10 shown in FIG. 2. As shown in FIG. 3, the display panel 10 includes pixel units 15 for display. Each pixel unit 15 corresponds to one pixel circuit 40. The pixel unit 15 includes multiple rows and multiple columns of sub-pixels. Each row includes a first sub-pixel 152, a second sub-pixel 154, and a third sub-pixel 156 arranged in sequence. Each column includes multiple sub-pixels of the same color. The sub-pixels of each row and the sub-pixels of each column form a pixel array.

[0020] In a specific embodiment of the present application, the first subpixel 152 may be a red subpixel, the second subpixel 154 may be a green subpixel, and the third subpixel 156 may be a blue subpixel, but the first subpixel 152, the second subpixel 154, and the third subpixel 156 do not have to follow the above corresponding rule. They may be subpixels of other color combinations, and the present application is not limited thereto.

[0021] 3, in an embodiment of the present application, each sub-pixel includes a first light-emitting element A and a second light-emitting element B. Specifically, the first sub-pixel 152, the second sub-pixel 154, and the third sub-pixel 156 each include a first light-emitting element A and a second light-emitting element B. In an exemplary embodiment, the first light-emitting element A and the second light-emitting element B may each be an organic light-emitting diode (OLED), such that the display panel 10 forms a dual-lamp OLED display.

[0022] Also referring to Fig. 4, Fig. 4 is a schematic diagram showing a circuit configuration of a pixel circuit 40 according to an embodiment of the present application. As shown in Fig. 4, in the embodiment of the present application, the pixel circuit 40 includes a control unit 50, a light-emitting unit 60 and a driving unit 70. The light-emitting unit 60 includes a first light-emitting element A and a second light-emitting element B. The first light-emitting element A and the second light-emitting element B are both electrically connected to the driving unit 70 and the control unit 50 at the same time.

[0023] The driving unit 70 is configured to transmit a data signal Data to the light-emitting unit 60 for driving the first light-emitting element A and / or the second light-emitting element B to emit light. The control unit 50 is configured to control the first light-emitting element A and / or the second light-emitting element B to be electrically connected to the first power source ELVSS. When the light-emitting unit 60 receives the data signal Data, the control unit 50 selectively controls the first light-emitting element A and / or the second light-emitting element B to emit light.

[0024] In a specific embodiment of the present application, the color emitted by the light-emitting unit 60 may be the color emitted by the first sub-pixel 152, the color emitted by the second sub-pixel 154, or the color emitted by the third sub-pixel 156, and is not particularly limited in the present application.

[0025] In an embodiment of the present application, the control unit 50 is further configured to control the first light-emitting element A or the second light-emitting element B to be electrically connected to the second power supply ELVDD, thereby causing the first light-emitting element A to release the charge accumulated therein, or causing the second light-emitting element B to release the charge accumulated therein.

[0026] In a specific embodiment of the present application, the first power supply ELVSS may be a low potential pixel power supply, and the second power supply ELVDD may be a high potential pixel power supply, but the present application is not limited thereto.

[0027] Also referring to FIG. 5, FIG. 5 is a schematic diagram showing a specific circuit configuration of the pixel circuit 40 shown in FIG. 4. As shown in FIG. 5, in an embodiment of the present application, the driving unit 70 includes a data input end, a scanning input end and an output end. The data input end is electrically connected to the data line, and the driving unit 70 is configured to receive a data signal Data through the data line. The scanning input end is electrically connected to the scanning line, and the driving unit 70 receives a scanning signal Scan through the scanning line. The driving unit 70 is configured to selectively control the transmission of the power supply signal VDD from the output end to the light-emitting unit 60 according to the received data signal Data and scanning signal Scan.

[0028] In a specific embodiment of the present application, the driving unit 70 may include a first transistor 71, a second transistor 73, and a storage capacitor 75. Specifically, the first transistor 71 and the second transistor 73 each have a control end, a first end, and a second end. One end of the storage capacitor 75 is electrically connected to the second end of the first transistor 71, and the other end of the storage capacitor 75 is electrically connected to the first end of the second transistor 73. The storage capacitor 75 is configured to store image data for controlling the light-emitting unit 60 to emit light.

[0029] A control terminal of the first transistor 71 is electrically connected to the scan input terminal and configured to receive a scan signal Scan from the scan input terminal. A first terminal of the first transistor 71 is electrically connected to the data input terminal and configured to receive a data signal Data from the data input terminal. A second terminal of the first transistor 71 is electrically connected to the control terminal of the second transistor 73.

[0030] The first transistor 71 is selectively turned on or off electrically in response to the potential of the received scan signal Scan.

[0031] Specifically, when the scanning signal Scan received by the first transistor 71 is at a first potential, the first terminal of the first transistor 71 is electrically disconnected from the second terminal of the first transistor 71. When the scanning signal Scan received by the first transistor 71 is at a second potential, the first terminal of the first transistor 71 is electrically connected to the second terminal of the first transistor 71. At this time, the data signal Data is transmitted from the second terminal of the first transistor 71 to the control terminal of the second transistor 73.

[0032] In a specific embodiment of the present application, a first terminal of the second transistor 73 is configured to receive a power signal VDD, and a second terminal of the second transistor 73 is electrically connected to the output terminal of the driving unit 70. The second transistor 73 is selectively turned on or off according to a data signal Data received at the control terminal. That is, the second transistor 73 is electrically selectively turned on or off according to the potential of the received data signal Data, and thus selectively transmits the power signal VDD to the output terminal.

[0033] Specifically, when the data signal Data received by the second transistor 73 is at a first potential, the first terminal of the second transistor 73 is electrically disconnected from the second terminal of the second transistor 73. When the data signal Data received by the second transistor 73 is at a second potential, the first terminal of the second transistor 73 is electrically connected to the second terminal of the second transistor 73. At this time, the power supply signal VDD is transmitted to the output terminal. Furthermore, the power supply signal VDD is transmitted to the light-emitting unit 60 via the output terminal.

[0034] In the embodiment of the present application, the first potential may be a high potential, and the second potential may be a low potential, and the present application is not particularly limited thereto.

[0035] In the embodiment of the present application, the first transistor 71 and the second transistor 73 may be P-type metal oxide semiconductor (PMOS) transistors, and the present application is not limited thereto. The first terminal may be a drain, the second terminal may be a source, and the control terminal may be a gate.

[0036] Continuing to refer to FIG. 5, the light emitting unit 60 may include a first light emitting element A and a second light emitting element B. A first end of the first light emitting element A and a first end of the second light emitting element B are both electrically connected to an output end, and a second end of the first light emitting element A and a second end of the second light emitting element B are both electrically connected to the control unit 50. The first end of the first light emitting element A and the first end of the second light emitting element B may be an anode, and the second end of the first light emitting element A and the second end of the second light emitting element B may be a cathode.

[0037] In an embodiment of the present application, the control unit 50 is configured to receive a first signal ab and a second signal sw, and, depending on the potential of the received first signal ab and the potential of the second signal sw, control the second terminal of the first light-emitting element A and / or the second terminal of the second light-emitting element B to be electrically connected to the first power supply ELVSS, thereby controlling the first light-emitting element A and / or the second light-emitting element B to selectively emit light.

[0038] In a specific embodiment of the present application, when the first signal ab received by the control unit 50 is at the first potential and the second signal sw received by the control unit 50 is at the first potential, the second end of the first light-emitting element A is electrically connected to the first power source ELVSS and configured to receive the first cathode voltage from the first power source ELVSS. At this time, the first light-emitting element A is used for light emission.

[0039] When the first signal ab received by the control unit 50 is at the second potential and the second signal sw received by the control unit 50 is at the first potential, the second end of the second light-emitting element B is electrically connected to the first power supply ELVSS and configured to receive the first cathode voltage from the first power supply ELVSS. At this time, the second light-emitting element B is used to emit light.

[0040] When the second signal sw received by the control unit 50 is at the second potential, regardless of whether the first signal ab is at the first potential or the second potential, the second terminal of the first light-emitting element A and the second terminal of the second light-emitting element B are both electrically connected to the first power source ELVSS and are simultaneously configured to receive the first cathode voltage from the first power source ELVSS. At this time, both the first light-emitting element A and the second light-emitting element B are used for light emission.

[0041] In an embodiment of the present application, the control unit 50 can further control the second end of the first light-emitting element A or the second end of the second light-emitting element B to be electrically connected to the second power supply ELVDD and receive a second cathode voltage from the second power supply ELVDD.

[0042] When the first light-emitting element A and / or the second light-emitting element B receives the power supply signal VDD at its first end and simultaneously receives the second cathode voltage at its second end, the electric field formed outside the first light-emitting element A and / or the second light-emitting element B has the same direction as the electric field formed by the charge accumulated inside the first light-emitting element A and / or the second light-emitting element B, so that the charge accumulated inside the first light-emitting element A and / or the second light-emitting element B is consumed, thereby extending the display life of the light-emitting unit 60 and reducing the risk of burn-in.

[0043] Specifically, in the embodiment of the present application, when the first signal ab received by the control unit 50 is at the first potential and the second signal sw received by the control unit 50 is at the first potential, the second end of the second light-emitting element B is electrically connected to the second power supply ELVDD and receives the second cathode voltage from the second power supply ELVDD. At this time, the electric field formed outside the second light-emitting element B has the same direction as the electric field formed by the charge accumulated inside, so that the charge accumulated inside the second light-emitting element B is consumed. Therefore, the display life of the second light-emitting element B is extended and the risk of burn-in is reduced.

[0044] When the first signal ab received by the control unit 50 is at the second potential and the second signal sw received by the control unit 50 is at the first potential, the second end of the first light-emitting element A is electrically connected to the second power supply ELVDD and receives the second cathode voltage from the second power supply ELVDD. At this time, the electric field formed outside the first light-emitting element A has the same direction as the electric field formed by the charge accumulated inside, so that the charge accumulated inside the first light-emitting element A is consumed. This extends the display life of the first light-emitting element A and reduces the risk of burn-in.

[0045] When the second signal sw received by the control unit 50 is at the second potential, regardless of whether the first signal ab is at the first potential or the second potential, the second terminal of the first light-emitting element A and the second terminal of the second light-emitting element B are both electrically connected to the first power source ELVSS and receive the first cathode voltage from the first power source ELVSS. At this time, the first light-emitting element A and the second light-emitting element B both emit light to compensate for the light emission brightness of the light-emitting element, avoid the problems of afterimages and burn-in caused by insufficient light emission brightness, thereby extending the life of the pixel circuit 40 and improving the display effect of the display panel 10.

[0046] In a specific embodiment of the present application, it can be understood that the potential of the second cathode voltage of the second power supply ELVDD is higher than the potential of the power supply signal VDD in order to make the electric field formed outside the light-emitting element have the same direction as the built-in electric field. Also, in order to ensure that the light-emitting element can emit light normally, the potential of the first cathode voltage of the first power supply ELVSS should be lower than the potential of the power supply signal VDD. And, it can be understood that the power supply signal VDD is used to drive the light-emitting element to emit light, and its voltage value should be matched with the light-emitting brightness of the light-emitting element, and the present application does not particularly limit this.

[0047] In the embodiment of the present application, the first signal ab switches from the first potential to the second potential or from the second potential to the first potential according to a preset switching time. The preset switching time can be determined according to a specific situation. The preset switching time can be 1 frame, 10 frames, 100 frames or other values, and is not specifically limited in the present application.

[0048] In the embodiment of the present application, the switching time when the second signal sw switches from the first potential to the second potential, or from the second potential to the first potential, may be determined based on actual conditions, and is not specifically limited in the present application.

[0049] Next, different light emission paths of the pixel circuit 40 will be described.

[0050] When the first light-emitting element A emits light: When the driving unit 70 receives the scanning signal Scan at the second potential and the data signal Data at the second potential, the first transistor 71 and the second transistor 73 are turned on, and the power supply signal VDD is output from the output terminal to the light emitting unit 60. The first terminal of the first light emitting element A and the first terminal of the second light emitting element B both receive the power supply signal. When the control unit 50 receives the first signal ab at the first potential and the second signal sw at the first potential, the second terminal of the first light emitting element A is electrically connected to the first power supply ELVSS to receive the first cathode voltage, and the second terminal of the second light emitting element B is electrically connected to the second power supply ELVDD to receive the second cathode voltage. At this time, the first light emitting element A emits light, and the second light emitting element B releases the charge accumulated therein.

[0051] When the second light-emitting element B emits light: When the driving unit 70 receives the scanning signal Scan at the second potential and the data signal Data at the second potential, the first transistor 71 and the second transistor 73 are turned on, and the power signal is output from the output terminal to the light emitting unit 60. The first terminal of the first light emitting element A and the first terminal of the second light emitting element B both receive the power signal. When the control unit 50 receives the first signal ab at the second potential and the second signal sw at the first potential, the second terminal of the second light emitting element B is electrically connected to the first power source ELVSS to receive the first cathode voltage, and the second terminal of the first light emitting element A is electrically connected to the second power source ELVDD to receive the second cathode voltage. At this time, the second light emitting element B emits light, and the first light emitting element A releases the charge accumulated therein.

[0052] When the first light-emitting element A and the second light-emitting element B both emit light: When the driving unit 70 receives the scanning signal Scan at the second potential and the data signal Data at the second potential, the first transistor 71 and the second transistor 73 are turned on, and the power signal is output from the output terminal to the light emitting unit 60. The first terminal of the first light emitting element A and the first terminal of the second light emitting element B both receive the power signal. When the control unit 50 receives the second signal sw at the second potential, the second terminal of the first light emitting element A and the second terminal of the second light emitting element B are both electrically connected to the first power source ELVSS and receive the first cathode voltage. At this time, the first light emitting element A and the second light emitting element B both emit light.

[0053] Also referring to FIG. 6, FIG. 6 is a schematic diagram showing a circuit configuration of the control unit 50 in the pixel circuit 40 shown in FIG. 5. As shown in FIG. 6, in the embodiment of the present application, the control unit 50 includes a conduction selection unit 51, a conduction control unit 53, and a switch unit 55. The conduction control unit 53 is electrically connected to each of the conduction selection unit 51 and the switch unit 55, and the switch unit 55 is further electrically connected to the first light-emitting element and the second light-emitting element. The conduction selection unit 51 is configured to receive a control power supply signal VDD1 and a first signal ab, and selectively control the conduction control unit 53 to be in a first conduction state or a second conduction state according to the first signal ab. The switch unit 55 receives a second signal sw, and controls the second end of the first light-emitting element and / or the second end of the second light-emitting element to be electrically conducted to the first power supply according to the conduction state of the conduction selection unit 51 and the potential of the second signal sw. Specifically, the switch unit 55 controls so that the second terminal of the first light-emitting element A is electrically connected to the first power supply ELVSS and the second terminal of the second light-emitting element B is electrically connected to the second power supply ELVDD. Alternatively, the switch unit 55 controls so that the second terminal of the second light-emitting element B is electrically connected to the first power supply ELVSS and the second terminal of the first light-emitting element A is electrically connected to the second power supply ELVDD. Alternatively, the switch unit 55 controls so that the second terminal of the first light-emitting element A and the second terminal of the second light-emitting element B are both electrically connected to the first power supply ELVSS.

[0054] As shown in FIG. 6, in the embodiment of the present application, the conduction selection unit 51 includes a first selection transistor 511, a second selection transistor 513, a third selection transistor 515 and a fourth selection transistor 517. The control end of the first selection transistor 511 is configured to receive a first signal ab, and the control end of the second selection transistor 513 is configured to receive an inverted signal BA of the first signal ab. The first end of the first selection transistor 511 and the first end of the second selection transistor 513 are configured to receive a control power signal VDD1, and the second end of the first selection transistor 511 is electrically connected to the first end of the third selection transistor 515 and the conduction control unit 53 at the same time. The second end of the second selection transistor 513 is electrically connected to the first end of the fourth selection transistor 517 and the conduction control unit 53 respectively. The inverted signal BA of the first signal ab is non-a non-b.

[0055] A control terminal of the third selection transistor 515 is electrically connected to the second terminal of the second selection transistor 513. A control terminal of the fourth selection transistor 517 is electrically connected to the second terminal of the first selection transistor 511. The second terminal of the third selection transistor 515 and the second terminal of the fourth selection transistor 517 are both electrically connected to the first power supply ELVSS.

[0056] In the embodiment of the present application, the control end of the first selection transistor 511 is configured to receive a first signal ab. The first signal ab controls the first end of the first selection transistor 511 to be electrically connected or disconnected from the second end.

[0057] In the embodiment of the present application, the control end of the fourth selection transistor 517 is configured to receive a control power signal VDD1 from the second end of the first selection transistor 511. The control power signal VDD1 controls the first selection transistor 511 to be in an on state or an off state. In addition, the control power signal VDD1 is selectively transmitted from the second end of the first selection transistor 511 to the conduction control unit 53.

[0058] When the first signal ab is at the first potential, the first terminal of the first selection transistor 511 is electrically disconnected from the second terminal, and the control power signal VDD1 cannot be transmitted from the first terminal to the second terminal. At this time, the control terminal of the fourth selection transistor 517 does not receive the control power signal VDD1 and is in an off state. The control power signal VDD1 cannot be transmitted from the second terminal of the first selection transistor 511 to the conduction control unit 53.

[0059] When the first signal ab is at the second potential, the first terminal of the first selection transistor 511 is electrically connected to the second terminal, and the control power signal VDD1 is transmitted from the first terminal to the second terminal. At this time, the control terminal of the fourth selection transistor 517 receives the control power signal VDD1 and is in an ON state. The control power signal VDD1 is transmitted from the second terminal of the first selection transistor 511 to the conduction control unit 53.

[0060] In the embodiment of the present application, the control end of the second selection transistor 513 is configured to receive an inverted signal BA of the first signal ab. The inverted signal BA controls the first end of the second selection transistor 513 to be electrically connected or disconnected from the second end.

[0061] In the embodiment of the present application, the control end of the third selection transistor 515 is configured to receive a control power signal VDD1 from the second end of the second selection transistor 513. The control power signal VDD1 controls the third selection transistor 515 to be in an on state or an off state. In addition, the control power signal VDD1 is selectively transmitted from the second end of the second selection transistor 513 to the conduction control unit 53.

[0062] When the inverted signal BA is at the first potential, the first terminal of the second selection transistor 513 is electrically disconnected from the second terminal, and the control power signal VDD1 cannot be transmitted from the first terminal to the second terminal of the second selection transistor 513. At this time, the control terminal of the third selection transistor 515 does not receive the control power signal VDD1 and is in an off state. The control power signal VDD1 cannot be transmitted from the second terminal of the second selection transistor 513 to the conduction control unit 53.

[0063] When the inverted signal BA is at the second potential, the first terminal of the second selection transistor 513 is electrically connected to the second terminal, and the control power signal VDD1 is transmitted from the first terminal to the second terminal of the second selection transistor 513. At this time, the control terminal of the third selection transistor 515 receives the control power signal VDD1 and is turned on. The control power signal VDD1 is transmitted from the second terminal of the second selection transistor 513 to the conduction control unit 53.

[0064] In the embodiment of the present application, the conduction control unit 53 includes a first conduction transistor 531 and a second conduction transistor 533. The control end of the first conduction transistor 531 is electrically connected to the second end of the second selection transistor 513, and the control end of the second conduction transistor 533 is electrically connected to the second end of the first selection transistor 511. The first end of the first conduction transistor 531 and the first end of the second conduction transistor 533 are both electrically connected to the first power supply ELVSS. The second end of the first conduction transistor 531 and the second end of the second conduction transistor 533 are both electrically connected to the switch unit 55.

[0065] In the embodiment of the present application, the control end of the first conductive transistor 531 is configured to receive a control power supply signal VDD1 from the second end of the second selection transistor 513. The control power supply signal VDD1 controls the first conductive transistor 531 to be in an on state or an off state.

[0066] A control end of the second conduction transistor 533 is configured to receive a control power supply signal VDD1 from the second end of the first selection transistor 511. The control power supply signal VDD1 controls the second conduction transistor 533 to be in an on state or an off state.

[0067] Since the control power supply signal VDD1 is always at the first potential, when the first conductive transistor 531 or the second conductive transistor 533 receives the control power supply signal VDD1, the first conductive transistor 531 or the second conductive transistor 533 is turned on. At this time, the second terminal of the first conductive transistor 531 or the second terminal of the second conductive transistor 533 is electrically connected to the first power supply ELVSS.

[0068] Specifically, when the control end of the first conductive transistor 531 receives the control power supply signal VDD1 from the second end of the second selection transistor 513, the first conductive transistor 531 is turned on and the second conductive transistor 533 is turned off. At this time, the conductive control unit 53 is in the first conductive state.

[0069] When the control end of the second conductive transistor 533 receives the control power signal VDD1 from the second end of the first selection transistor 511, the first conductive transistor 531 is turned off and the second conductive transistor 533 is turned on. At this time, the conductive control unit 53 is in the second conductive state.

[0070] In the embodiment of the present application, the switch unit 55 includes a first emission transistor 551, a second emission transistor 552, a third emission transistor 554 and a fourth emission transistor 556. The control end of the first emission transistor 551 is electrically connected to the second end of the first conduction transistor 531, and the control end of the second emission transistor 552 is electrically connected to the second end of the second conduction transistor 533. The first end of the first emission transistor 551 and the first end of the second emission transistor 552 are both electrically connected to the second power supply ELVDD. The second end of the first emission transistor 551 is electrically connected to the second end of the second conduction transistor 533, and the second end of the second emission transistor 552 is electrically connected to the second end of the first conduction transistor 531.

[0071] A control terminal of the third emission transistor 554 is configured to receive the second signal sw. A first terminal of the third emission transistor 554 is simultaneously connected to the second terminal of the second conduction transistor 533 and the second terminal of the first emission transistor 551. A second terminal of the third emission transistor 554 is electrically connected to the second terminal of the second light-emitting element B.

[0072] A control terminal of the fourth emission transistor 556 is configured to receive the second signal Sw. A first terminal of the fourth emission transistor 556 is simultaneously electrically connected to the second terminal of the first conduction transistor 531 and the second terminal of the second emission transistor 552. A second terminal of the fourth emission transistor 556 is electrically connected to the second terminal of the first light-emitting element A.

[0073] In the embodiment of the present application, the control end of the first emission transistor 551 is configured to receive the first cathode voltage of the first power source ELVSS from the second end of the first conduction transistor 531. The first cathode voltage of the first power source ELVSS controls the first end of the first emission transistor 551 to be electrically connected to the second end.

[0074] The control end of the second emission transistor 552 is configured to receive the first cathode voltage of the first power source ELVSS from the second end of the second conduction transistor 533. The first cathode voltage of the first power source ELVSS controls the first end of the second emission transistor 552 to be electrically connected to the second end.

[0075] In this embodiment, since the first cathode voltage is always at the second potential, when the control end of the first emission transistor 551 receives the first cathode voltage, the first emission transistor 551 is turned on. At this time, the second cathode voltage of the second power source ELVDD is transmitted from the first end of the first emission transistor 551 to its second end. Or, when the control end of the second emission transistor 552 receives the first cathode voltage, the second emission transistor 552 is turned on. At this time, the second cathode voltage of the second power source ELVDD is transmitted from the first end of the second emission transistor 552 to its second end.

[0076] In the embodiment of the present application, the control end of the third emission transistor 554 receives the second signal sw. The second signal sw controls the third emission transistor 554 to be in an on state or an off state.

[0077] Specifically, when the second signal sw is at a first potential, the third emission transistor 554 is in an on state, and when the second signal sw is at a second potential, the third emission transistor 554 is in an off state.

[0078] In the embodiment of the present application, the control end of the fourth emission transistor 556 receives the second signal sw. The second signal sw controls the fourth emission transistor 556 to be in an on state or an off state.

[0079] Specifically, when the second signal sw is at a first potential, the fourth emission transistor 556 is in an on state. When the second signal sw is at a second potential, the fourth emission transistor 556 is in an off state. In response, when the third emission transistor 554 is in an on state and the conduction control unit 53 is in a first conduction state, the first light-emitting element A emits light. When the fourth emission transistor 556 is in an on state and the conduction control unit 53 is in a second conduction state, the second light-emitting element B emits light.

[0080] In the embodiment of the present application, the switch unit 55 further includes a first switch transistor 555 and a second switch transistor 553. The control end of the first switch transistor 555 and the control end of the second switch transistor 553 are configured to receive a second signal sw. The first end of the first switch transistor 555 and the first end of the second switch transistor 553 are both electrically connected to the first power supply ELVSS. The second end of the first switch transistor 555 is electrically connected to the second end of the first light-emitting element A, and the second end of the second switch transistor 553 is electrically connected to the second end of the second light-emitting element B.

[0081] In the embodiment of the present application, the second signal sw controls the first switch transistor 555 and the second switch transistor 553 to be in an on or off state.

[0082] When the second signal sw is at the second potential, the first switch transistor 555 and the second switch transistor 553 are both in an on state, and when the second terminal of the first switch transistor 555 and the second terminal of the second switch transistor 553 are both electrically connected to the first power supply ELVSS, the second terminal of the first light-emitting element A and the second terminal of the second light-emitting element B are both electrically connected to the first power supply ELVSS. At this time, the first light-emitting element A and the second light-emitting element B emit light simultaneously to compensate for the light emission luminance of the light-emitting elements, avoid the problems of afterimages and burn-in caused by insufficient light emission luminance, thereby extending the life of the pixel circuit 40 and improving the display effect of the display panel 10.

[0083] When the second signal sw is at the first potential, the first switch transistor 555 and the second switch transistor 553 are both in an off state. The signal inputs to the second terminal of the first light-emitting element A and the second terminal of the second light-emitting element B are controlled by the first emission transistor 551, the second emission transistor 552, the third emission transistor 554 and the fourth emission transistor 556.

[0084] In a specific embodiment of the present application, when the conduction control unit 53 is in the first conduction state and the second signal sw is at the first potential, the first emission transistor 551, the third emission transistor 554 and the fourth emission transistor 556 are in an on state, and the second emission transistor 552 is in an off state. The first cathode voltage of the first power supply ELVSS is transmitted to the second end of the first light-emitting element A, so that the first light-emitting element A is used for light emission, and the second cathode voltage of the second power supply ELVDD is transmitted to the second end of the second light-emitting element B.

[0085] When the conduction control unit 53 is in the second conduction state and the second signal sw is at the first potential, the second emission transistor 552, the third emission transistor 554 and the fourth emission transistor 556 are in an on state, and the first emission transistor 551 is in an off state. The first cathode voltage of the first power supply ELVSS is transmitted to the second end of the second light-emitting element B, so that the second light-emitting element B is used for light emission, and the second cathode voltage of the second power supply ELVDD is transmitted to the second end of the first light-emitting element A.

[0086] When the second signal sw is at the first potential, regardless of the conductive state of the conduction control unit 53, the first switch transistor 555 and the second switch transistor 553 are in the on state, and the first cathode voltage of the first power supply ELVSS is transmitted to the second terminal of the first light-emitting element A and the second terminal of the second light-emitting element B, respectively.

[0087] In the embodiment of the present application, the first selection transistor 511, the second selection transistor 513, the third selection transistor 515, the fourth selection transistor 517, the first conduction transistor 531, the second conduction transistor 533, the first emission transistor 551, the second emission transistor 552, the first switch transistor 555, the third emission transistor 554, the second switch transistor 553, and the fourth emission transistor 556 may be metal-oxide-semiconductor field-effect transistors (MOSFETs), but the present application is not specifically limited thereto. Among them, the third selection transistor 515, the fourth selection transistor 517, the first conduction transistor 531, the second conduction transistor 533, the third emission transistor 554, and the fourth emission transistor 556 may be N-channel MOSFETs. The first selection transistor 511, the second selection transistor 513, the first emission transistor 551, the second emission transistor 552, the first switch transistor 555, and the second switch transistor 553 may be P-channel MOSFETs, although this application is not specifically limited thereto.

[0088] In an embodiment of the present application, the first terminals of the first selection transistor 511, the second selection transistor 513, the third selection transistor 515, the fourth selection transistor 517, the first emission transistor 551, the second emission transistor 552, the third emission transistor 554, and the fourth emission transistor 556 may be drains, the second terminals may be sources, and the control terminals may be gates.

[0089] In an embodiment of the present application, the first terminals of the first conductive transistor 531, the second conductive transistor 533, the first switch transistor 555, and the second switch transistor 553 may be sources, the second terminals may be drains, and the control terminals may be gates.

[0090] Next, a process of controlling the first light-emitting element A and / or the second light-emitting element B to emit light by the control unit 50 will be described.

[0091] When the first light-emitting element A is used for light emission: When the first signal ab is at the first potential and the second signal sw is at the first potential, the first selection transistor 511 is in the off state and the second selection transistor 513 is in the on state. Therefore, the fourth selection transistor 517 is in the off state. The control power supply signal VDD1 is transmitted from the first terminal to the second terminal of the second selection transistor 513.

[0092] The control terminal of the third selection transistor 515 and the control terminal of the first conduction transistor 531 are both in an on state by receiving the control power supply signal VDD1 from the second terminal of the second selection transistor 513. Therefore, the first cathode voltage of the first power supply ELVSS is transmitted to the second terminal of the first conduction transistor 531.

[0093] Since the control terminal of the fourth emission transistor 556 is in the on state in response to the second signal sw at the first potential, the first cathode voltage is transmitted from the second terminal of the first conduction transistor 531 to the second terminal of the fourth emission transistor 556, and further to the second terminal of the first light-emitting element A. Therefore, the first light-emitting element A is used for light emission.

[0094] Furthermore, since the control end of the first emission transistor 551 is in an on state receiving the first cathode voltage from the second end of the first conduction transistor 531, the second cathode voltage of the second power supply ELVDD is transmitted from the first end to the second end of the first emission transistor 551. Since the control end of the third emission transistor 554 is in an on state receiving the second signal sw at the first potential, the second cathode voltage is transmitted to the second end of the second light-emitting element B via the third emission transistor 554. At this time, the second light-emitting element B does not emit light and releases the charge accumulated therein, thereby avoiding display afterimages and extending the display life.

[0095] When the second light-emitting element B is used for light emission: When the first signal ab is at the second potential and the second signal sw is at the first potential, the first selection transistor 511 is in an ON state and the second selection transistor 513 is in an OFF state, so that the third selection transistor 515 is in an OFF state and the control power supply signal VDD1 is transmitted from the first terminal to the second terminal of the first selection transistor 511.

[0096] The control terminal of the fourth selection transistor 517 and the control terminal of the second conduction transistor 533 are both in an on state by receiving the control power supply signal VDD1 from the second terminal of the first selection transistor 511. Therefore, the first cathode voltage of the first power supply ELVSS is transmitted to the second terminal of the second conduction transistor 533.

[0097] Since the control terminal of the third emission transistor 554 is in the on state in response to the second signal sw of the first potential, the first cathode voltage is transmitted from the second terminal of the second conduction transistor 533 to the second terminal of the third emission transistor 554, and further transmitted to the second terminal of the second light-emitting element B. At this time, the second light-emitting element B is used for light emission.

[0098] Furthermore, since the control terminal of the second emission transistor 552 is in an on state receiving the first cathode voltage from the second terminal of the second conduction transistor 533, the second cathode voltage of the second power supply ELVDD is transmitted from the first terminal to the second terminal of the second emission transistor 552. Since the control terminal of the fourth emission transistor 556 is in an on state receiving the second signal sw at the first potential, the second cathode voltage is transmitted to the second terminal of the first light-emitting element A via the fourth emission transistor 556. At this time, the first light-emitting element A does not emit light and releases the charge accumulated inside, thereby avoiding display afterimages and extending the display life.

[0099] When the first light-emitting element A and the second light-emitting element B are used to emit light simultaneously: When the second signal sw is at the second potential, the first switch transistor 555 and the second switch transistor 553 are both in an on state, and when the second terminal of the first switch transistor 555 and the second terminal of the second switch transistor 553 are both electrically connected to the first power supply ELVSS, the second terminal of the first light-emitting element A and the second terminal of the second light-emitting element B are both electrically connected to the first power supply ELVSS. At this time, the first light-emitting element A and the second light-emitting element B emit light simultaneously to compensate for the light emission luminance of the light-emitting elements, avoid the problems of afterimages and burn-in caused by insufficient light emission luminance, thereby extending the life of the pixel circuit 40 and improving the display effect of the display panel 10.

[0100] Referring to Fig. 7, Fig. 7 is an operation timing chart of the pixel circuit 40 shown in Fig. 5. As shown in Fig. 7, the curve corresponding to Scan n and the curve corresponding to Scan n+1 correspond to the timing of any two adjacent data lines among the data lines, the curve corresponding to Data corresponds to the timing of the data signal Data, the curve corresponding to ab corresponds to the timing of the first signal ab, and the curve corresponding to sw corresponds to the timing of the second signal sw. The potential of the first signal ab is switched according to a preset switching time. That is, the potential of the first signal ab is switched once every time the preset switching time elapses.

[0101] In a specific embodiment of the present application, the preset switching time may be 200 frames. It can be understood that the preset switching time can be determined based on the specific situation of the display device 100, and is not particularly limited in the present application.

[0102] In the embodiment of the present application, a control unit 50 is provided in the pixel circuit 40, and a first light-emitting element A and a second light-emitting element B are provided in the light-emitting unit 60. The control unit 50 selectively controls the first light-emitting element A and / or the second light-emitting element B to emit light, thereby extending the display life of the pixel circuit 40.

[0103] Meanwhile, the control unit 50 selectively controls the first light-emitting element A or the second light-emitting element B to be electrically connected to the second power supply ELVDD and receive the second cathode voltage, thereby causing the first light-emitting element A to release its internally accumulated charge when not emitting light, or causing the second light-emitting element B to release its internally accumulated charge when not emitting light, thereby further extending the display life of the light-emitting unit, thereby reducing the risk of burn-in and improving the display quality.

[0104] Based on the same idea, the present application further provides a display panel 10. The display panel 10 includes several pixel circuits 40.

[0105] Also referring to Fig. 8, Fig. 8 is a schematic diagram of another display panel 1 according to an embodiment of the present application. In the embodiment of the present application, the display panel 1 is distinguished from the display panel 10 in that it further includes a general control unit 18. The general control unit 18 is electrically connected to a plurality of pixel circuits 40 and configured to simultaneously control the plurality of pixel circuits 40 to switch the first light-emitting element A and / or the second light-emitting element B to emit light.

[0106] 8 illustrates one display block in the display panel 1. The display block includes nine pixel circuits 40. It can be understood that the pixel circuits 40 in the display panel 1 are controlled by blocks, and the number of pixel circuits included in each display block may be determined based on the actual situation, and the present application does not specifically limit the same.

[0107] In a specific embodiment of the present application, the total control unit 18 and the pixel circuit 40 can communicate with each other via an Inter-Integrated Circuit (IIC), a Serial Peripheral Interface (SPI), etc., and the selection of the protocol can be determined according to the actual situation, and the present application does not specifically limit the same.

[0108] It should be noted that in the embodiment of the present application, the display panel 10 includes a plurality of pixel circuits 40, each pixel circuit 40 includes one control unit 50, each control unit 50 corresponds to one address, and the total control unit 18 is configured to send a control signal to the plurality of control units 50. The control signal includes a start segment, several address segments and several command segments. The start segment includes a 0.5 ms start signal at a first potential. Each address segment is a 4 μs data signal including a block address, and each command segment is a 2 μs data signal including command information.

[0109] In other words, the control signal includes a start portion and several data portions. The start portion does not include data information. Each data portion includes 6 bytes (bits) of data, of which the first 4 bytes (bits) of data are the address of the corresponding display block, and the last 2 bytes (bits) of data are the corresponding signal command. The signal command corresponds to the second signal sw and the first signal ab.

[0110] In this embodiment, the display block controlled by the total control unit 18 receives the control signal, identifies the control unit corresponding to the address segment of the control signal, and then outputs the command segment of the control signal to control the pixel circuit 40 to switch the light-emitting element used for emitting light. As can be understood, in the pixel circuit 40 that does not correspond to the address segment of the control signal, the light-emitting element originally used for emitting light continues to emit light.

[0111] In the embodiment of the present application, the time of 1 bit is 1 μs, but the present application does not specifically limit this. The length of the signal included in the control signal can be determined according to the actual situation.

[0112] 9 and 10, Fig. 9 is a timing chart of control signals transmitted by the general control unit 18 in the display panel 1 shown in Fig. 8. Fig. 10 shows addresses corresponding to each control unit in the display panel 1 shown in Fig. 8.

[0113] As shown in FIG. 9, in the timing chart of the control signal transmitted by the total control unit 18, the start segment of the control signal is "111111" and the first address segment is 0001. The first command segment is 11, in which the first 1 of the first command segment corresponds to the first signal ab at the first potential, and the second 1 corresponds to the second signal sw at the first potential. The second address segment is 0010. The second command segment is also 11, in which the first 1 of the second command segment corresponds to the first signal ab at the first potential, and the second 1 corresponds to the second signal sw at the first potential. The third address segment is 0011. The third command segment is 01, in which the 0 of the third command segment corresponds to the first signal ab at the second potential, and the 1 corresponds to the second signal sw at the first potential.

[0114] The different control units 50 receive or do not receive the command segment depending on the address segment of the received control signal. Specifically, the general control unit 18 controls the pixel circuits 40 to switch the light emitting elements used for emitting light by sending command signals corresponding to the address segments to the control units 50 corresponding to the address segments.

[0115] As shown in FIG. 10, when the control units 50 of the nine pixel circuits 40 shown in FIG. 8 are sequentially written as control unit 1, control unit 2 to control unit 9, the addresses corresponding to the nine control units 50 are as shown in the figure.

[0116] Next, the present embodiment will be described taking as an example a case where each block includes nine pixel circuits.

[0117] In the embodiment of the present application, the general control unit 18 is electrically connected to the control units 50 of the nine pixel circuits 40. When a display abnormality occurs in two or more pixel circuits 40 in a display block, the general control unit 18 controls the two or more pixel circuits 40 in which the display abnormality occurs to switch the light-emitting elements used for emitting light in the light-emitting unit 60. As can be understood, the display abnormality refers to the occurrence of phenomena such as burn-in and afterimage.

[0118] In order to clearly explain that the total control unit 18 simultaneously controls the two pixel circuits 40 to switch the light-emitting element used for emitting light, the two pixel circuits in the display block are referred to as a first pixel circuit and a second pixel circuit.

[0119] For example, in a specific embodiment of the present application, when a display abnormality occurs in the first light-emitting element A of the first pixel circuit and a display abnormality occurs in the second light-emitting element B of the second pixel circuit, the total control unit 18 simultaneously controls the first pixel circuit and the second pixel circuit to switch to another light-emitting element to display a screen. That is, the first pixel circuit switches to the second light-emitting element B to display, and the second pixel circuit switches to the first light-emitting element A to display. It can be understood that the total control unit 18 can also simultaneously control three, four, or other numbers of pixel circuits 40 to switch the light-emitting elements used for light emission in each pixel circuit 40, and the present application is not specifically limited thereto.

[0120] Based on the same idea, the present application further provides a display device 100. The display device 100 includes the above-mentioned display panel.

[0121] In the pixel circuit 40, the display panel, and the display device 100 of the present application, the pixel circuit 40 is provided with a control unit 50, and the light-emitting unit 60 is provided with a first light-emitting element A and a second light-emitting element B. The control unit 50 selectively controls the first light-emitting element A and / or the second light-emitting element B to emit light, thereby extending the display life of the pixel circuit 40. At the same time, the control unit 50 selectively controls the second end of the first light-emitting element A or the second end of the second light-emitting element B to be electrically connected to the second power supply ELVDD and receive the second cathode voltage, thereby causing the first light-emitting element A to release its internally accumulated charge when not emitting light, or causing the second light-emitting element B to release its internally accumulated charge when not emitting light, thereby further extending the display life of the light-emitting unit 60. This reduces the risk of burn-in and improves the display quality.

[0122] The display panel is also provided with a general control unit 18. Several pixel circuits 40 in the display panel are controlled as blocks, and a general control unit 18 is provided for each display block, so that the general control unit 18 simultaneously switches the light-emitting elements used for display for a pixel circuit 40 in which an abnormal display phenomenon has occurred, thereby further improving the efficiency of controlling the display effect.

[0123] Although not all possible combinations of the technical features in the above embodiments are described above, all combinations of those technical features should be considered to be within the scope of the description of this specification, unless there is a contradiction.

[0124] The reference terms "one embodiment," "some embodiments," "exemplary embodiments," "examples," "particular examples," or "some examples" used herein mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. Exemplary references to the above terms herein do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples, as appropriate.

[0125] The above embodiments only show some embodiments of the present application, and the description of the above embodiments is specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. Without departing from the idea of ​​the present application, a person skilled in the art may make some changes and improvements, and all of these changes and improvements should belong to the protection scope of the present application. Therefore, the protection scope of the present application should be based on the attached claims.

Claims

1. A pixel circuit including a light emitting unit and a driving unit, The pixel circuit further includes a control unit, and the light emitting unit includes a first light emitting element and a second light emitting element, and the first light emitting element and the second light emitting element are both electrically connected to the driving unit and the control unit at the same time; The driving unit is configured to transmit a data signal to the light-emitting unit to drive the first light-emitting element and / or the second light-emitting element to emit light; the control unit is configured to control the first light-emitting element and / or the second light-emitting element to be electrically connected to a first power source; When the light emitting unit receives the data signal, the control unit selectively controls the first light emitting element and / or the second light emitting element to emit light.

23. A pixel circuit comprising:

2. the driving unit includes a first transistor, a second transistor and a storage capacitor; one end of the storage capacitor is electrically connected to the second end of the first transistor, and the other end of the storage capacitor is electrically connected to the first end of the second transistor; a control end of the first transistor configured to receive a scanning signal, a first end of the first transistor configured to receive the data signal, and a second end of the first transistor electrically connected to the control end of the second transistor; A first end of the second transistor is configured to receive a power signal, and a second end of the second transistor is electrically connected to the light emitting unit; The first transistor is configured to selectively transmit the data signal to the second transistor in response to a potential of the received scanning signal, and the second transistor is configured to selectively transmit the power supply signal to the light emitting unit in response to the received data signal.

2. The pixel circuit according to claim 1 .

3. When the scanning signal received by the first transistor is at a first potential, a first terminal of the first transistor is electrically disconnected from a second terminal of the first transistor, and when the scanning signal received by the first transistor is at a second potential, the first terminal of the first transistor is electrically connected to a second terminal of the first transistor, and the data signal is transmitted to the second transistor; When the data signal received by the second transistor is at a first potential, the first terminal of the second transistor is electrically disconnected from the second terminal of the second transistor, and when the data signal received by the second transistor is at a second potential, the first terminal of the second transistor is electrically connected to the second terminal of the second transistor, and the power signal is transmitted to the light emitting unit.

3. The pixel circuit according to claim 2.

4. a first end of the first light emitting element and a first end of the second light emitting element are both electrically connected to a second end of the second transistor, and a second end of the first light emitting element and a second end of the second light emitting element are both electrically connected to the control unit; the control unit is configured to receive a first signal and a second signal, and control the second terminal of the first light-emitting element and / or the second terminal of the second light-emitting element to be electrically connected to the first power supply according to a potential of the first signal and a potential of the second signal.

3. The pixel circuit according to claim 2.

5. The control unit is further configured to control the second end of the first light-emitting element or the second end of the second light-emitting element to be electrically connected to a second power source, thereby causing the first light-emitting element to release charges accumulated therein, or causing the second light-emitting element to release charges accumulated therein.

5. The pixel circuit according to claim 4.

6. When the first signal received by the control unit is at a first potential and the second signal received by the control unit is at a first potential, a second end of the first light-emitting element is electrically connected to the first power supply and configured to receive a first cathode voltage from the first power supply, the first light-emitting element is used to emit light, and a second end of the second light-emitting element is electrically connected to the second power supply and configured to receive a second cathode voltage from the second power supply; When the first signal received by the control unit is at a second potential and the second signal received by the control unit is at a first potential, a second end of the second light-emitting element is electrically connected to the first power supply and configured to receive the first cathode voltage from the first power supply, and the second light-emitting element is used to emit light, and a second end of the first light-emitting element is electrically connected to the second power supply and configured to receive the second cathode voltage from the second power supply; When the second signal received by the control unit is at a second potential, the second end of the first light-emitting element and the second end of the second light-emitting element are both electrically connected to the first power source and are configured to simultaneously receive the first cathode voltage from the first power source, and both the first light-emitting element and the second light-emitting element are used to emit light.

6. The pixel circuit according to claim 5.

7. the control unit includes a conduction selection unit, a conduction control unit and a switch unit, the conduction control unit is electrically connected to the conduction selection unit and the switch unit, respectively, the switch unit is further electrically connected to a second end of the first light-emitting element and a second end of the second light-emitting element, respectively; the conduction selection unit is configured to receive the first signal and selectively control the conduction control unit to be in a first conduction state or a second conduction state in response to the first signal; the switch unit is configured to receive the second signal and control the second end of the first light-emitting element and / or the second end of the second light-emitting element to be electrically connected to the first power supply according to the conductive state of the conductive selection unit and the potential of the second signal.

6. The pixel circuit according to claim 5.

8. the conduction selection unit includes a first selection transistor, a second selection transistor, a third selection transistor and a fourth selection transistor, a control end of the first selection transistor is configured to receive the first signal, a control end of the second selection transistor is configured to receive an inverted signal, a first end of the first selection transistor and a first end of the second selection transistor are configured to receive a control power supply signal, a second end of the first selection transistor is electrically connected to a first end of the third selection transistor and the conduction control unit simultaneously, and a second end of the second selection transistor is electrically connected to a first end of the fourth selection transistor and the conduction control unit, respectively; a control end of the third selection transistor is electrically connected to the second end of the second selection transistor, a control end of the fourth selection transistor is electrically connected to the second end of the first selection transistor, and the second end of the third selection transistor and the second end of the fourth selection transistor are both electrically connected to the first power supply.

8. The pixel circuit according to claim 7.

9. When the first signal is at a first potential, the inverted signal is at a second potential, the first selection transistor and the fourth selection transistor are both in an off state, the second selection transistor and the third selection transistor are both in an on state, and the control power signal is transmitted from a second end of the second selection transistor to the conduction control unit; when the first signal is at a second potential, the inverted signal is at a first potential, the second selection transistor and the third selection transistor are in an off state, the first selection transistor and the fourth selection transistor are both in an on state, and the control power signal is transmitted from the second end of the first selection transistor to the conduction control unit; 9. The pixel circuit according to claim 8.

10. the conduction control unit includes a first conduction transistor and a second conduction transistor, a control end of the first conduction transistor is electrically connected to a second end of the second selection transistor, a control end of the second conduction transistor is electrically connected to a second end of the first selection transistor, a first end of the first conduction transistor and a first end of the second conduction transistor are both electrically connected to the first power supply, and a second end of the first conduction transistor and a second end of the second conduction transistor are both electrically connected to the switch unit; When the first conduction transistor receives the control power signal from the second selection transistor, the first conduction transistor is turned on, the second conduction transistor is turned off, and the conduction control unit is in the first conduction state; When the second conduction transistor receives the control power signal from the first selection transistor, the first conduction transistor is turned off, the second conduction transistor is turned on, and the conduction control unit is in the second conduction state.

9. The pixel circuit according to claim 8.

11. the switch unit includes a first emission transistor, a second emission transistor, a third emission transistor and a fourth emission transistor, a control end of the first emission transistor is electrically connected to the second end of the first conduction transistor, a control end of the second emission transistor is electrically connected to the second end of the second conduction transistor, the first end of the first emission transistor and the first end of the second emission transistor are both electrically connected to the second power supply, the second end of the first emission transistor is electrically connected to the second end of the second conduction transistor, and the second end of the second emission transistor is electrically connected to the second end of the first conduction transistor; a control end of the third emission transistor is configured to receive the second signal, a first end of the third emission transistor is electrically connected to each of the second end of the second conduction transistor and the second end of the first emission transistor, and a second end of the third emission transistor is electrically connected to a second end of the second light-emitting element; a control end of the fourth emission transistor is configured to receive the second signal, a first end of the fourth emission transistor is simultaneously electrically connected to the second end of the first conduction transistor and the second end of the second emission transistor, and a second end of the fourth emission transistor is electrically connected to the second end of the first light-emitting element; 11. The pixel circuit of claim 10.

12. When the conduction control unit is in the first conduction state and the second signal is at a first potential, the first emission transistor, the third emission transistor and the fourth emission transistor are in an on state, the second emission transistor is in an off state, a first cathode voltage of the first power source is transmitted to the second end of the first light-emitting element, and the first light-emitting element is used to emit light, and a second cathode voltage of the second power source is transmitted to the second end of the second light-emitting element; When the conduction control unit is in the second conduction state and the second signal is at a first potential, the second emission transistor, the third emission transistor and the fourth emission transistor are in an on state, the first emission transistor is in an off state, the first cathode voltage of the first power source is transmitted to the second end of the second light-emitting element, and the second light-emitting element is used to emit light, and the second cathode voltage of the second power source is transmitted to the second end of the first light-emitting element.

12. The pixel circuit of claim 11.

13. the switch unit further includes a first switch transistor and a second switch transistor, a control end of the first switch transistor and a control end of the second switch transistor are configured to receive the second signal, a first end of the first switch transistor and a first end of the second switch transistor are both electrically connected to the first power supply, a second end of the first switch transistor is electrically connected to a second end of the first light-emitting element, and a second end of the second switch transistor is electrically connected to a second end of the second light-emitting element; When the second signal is at a second potential, the first switch transistor and the second switch transistor are both in an on state, and the first cathode voltage of the first power supply is transmitted to each of the second end of the first light-emitting element and the second end of the second light-emitting element.

13. The pixel circuit of claim 12.

14. A display panel, The display panel includes a pixel circuit, the pixel circuit includes a light emitting unit, a driving unit and a control unit, the light emitting unit includes a first light emitting element and a second light emitting element, the first light emitting element and the second light emitting element are both electrically connected to the driving unit and the control unit at the same time; The driving unit is configured to transmit a data signal to the light-emitting unit to drive the first light-emitting element and / or the second light-emitting element to emit light; the control unit is configured to control the first light-emitting element and / or the second light-emitting element to be electrically connected to a first power source; When the light emitting unit receives the data signal, the control unit selectively controls the first light emitting element and / or the second light emitting element to emit light. A display panel characterized by:

15. the driving unit includes a first transistor, a second transistor and a storage capacitor; one end of the storage capacitor is electrically connected to the second end of the first transistor, and the other end of the storage capacitor is electrically connected to the first end of the second transistor; a control end of the first transistor configured to receive a scanning signal, a first end of the first transistor configured to receive the data signal, and a second end of the first transistor electrically connected to the control end of the second transistor; A first end of the second transistor is configured to receive a power signal, and a second end of the second transistor is electrically connected to the light emitting unit; The first transistor is configured to selectively transmit the data signal to the second transistor in response to a potential of the received scanning signal, and the second transistor is configured to selectively transmit the power supply signal to the light emitting unit in response to the received data signal; When the scanning signal received by the first transistor is at a first potential, a first terminal of the first transistor is electrically disconnected from a second terminal of the first transistor, and when the scanning signal received by the first transistor is at a second potential, the first terminal of the first transistor is electrically connected to a second terminal of the first transistor, and the data signal is transmitted to the second transistor; When the data signal received by the second transistor is at a first potential, the first terminal of the second transistor is electrically disconnected from the second terminal of the second transistor, and when the data signal received by the second transistor is at a second potential, the first terminal of the second transistor is electrically connected to the second terminal of the second transistor, and the power signal is transmitted to the light emitting unit.

15. The display panel according to claim 14.

16. a first end of the first light emitting element and a first end of the second light emitting element are both electrically connected to a second end of the second transistor, and a second end of the first light emitting element and a second end of the second light emitting element are both electrically connected to the control unit; the control unit is configured to receive a first signal and a second signal, and control, according to a potential of the first signal and a potential of the second signal, such that a second end of the first light-emitting element and / or a second end of the second light-emitting element are electrically connected to the first power source; the control unit is further configured to control the second end of the first light-emitting element or the second end of the second light-emitting element to be electrically connected to a second power source, thereby causing the first light-emitting element to release charges accumulated therein, or causing the second light-emitting element to release charges accumulated therein; When the first signal received by the control unit is at a first potential and the second signal received by the control unit is at a first potential, a second end of the first light-emitting element is electrically connected to the first power supply and configured to receive a first cathode voltage from the first power supply, the first light-emitting element is used to emit light, and a second end of the second light-emitting element is electrically connected to the second power supply and configured to receive a second cathode voltage from the second power supply; When the first signal received by the control unit is at a second potential and the second signal received by the control unit is at a first potential, a second end of the second light-emitting element is electrically connected to the first power supply and configured to receive the first cathode voltage from the first power supply, and the second light-emitting element is used to emit light, and a second end of the first light-emitting element is electrically connected to the second power supply and configured to receive the second cathode voltage from the second power supply; When the second signal received by the control unit is at a second potential, the second end of the first light-emitting element and the second end of the second light-emitting element are both electrically connected to the first power source and are configured to simultaneously receive the first cathode voltage from the first power source, and both the first light-emitting element and the second light-emitting element are used to emit light.

16. The display panel according to claim 15.

17. The display panel further includes a general control unit, the general control unit being electrically connected to a plurality of the pixel circuits, and the general control unit being configured to simultaneously control the plurality of the pixel circuits to switch the first light-emitting element and / or the second light-emitting element to emit light.

15. The display panel according to claim 14.

18. A display device, comprising: The display device includes a display panel, the display panel includes a pixel circuit, the pixel circuit includes a light emitting unit, a driving unit and a control unit, the light emitting unit includes a first light emitting element and a second light emitting element, the first light emitting element and the second light emitting element are both electrically connected to the driving unit and the control unit at the same time; The driving unit is configured to transmit a data signal to the light-emitting unit to drive the first light-emitting element and / or the second light-emitting element to emit light; the control unit is configured to control the first light-emitting element and / or the second light-emitting element to be electrically connected to a first power source; When the light emitting unit receives the data signal, the control unit selectively controls the first light emitting element and / or the second light emitting element to emit light. A display device comprising:

19. the driving unit includes a first transistor, a second transistor and a storage capacitor; one end of the storage capacitor is electrically connected to the second end of the first transistor, and the other end of the storage capacitor is electrically connected to the first end of the second transistor; a control end of the first transistor configured to receive a scanning signal, a first end of the first transistor configured to receive the data signal, and a second end of the first transistor electrically connected to the control end of the second transistor; A first end of the second transistor is configured to receive a power signal, and a second end of the second transistor is electrically connected to the light emitting unit; The first transistor is configured to selectively transmit the data signal to the second transistor in response to a potential of the received scanning signal, and the second transistor is configured to selectively transmit the power supply signal to the light emitting unit in response to the received data signal; When the scanning signal received by the first transistor is at a first potential, a first terminal of the first transistor is electrically disconnected from a second terminal of the first transistor, and when the scanning signal received by the first transistor is at a second potential, the first terminal of the first transistor is electrically connected to a second terminal of the first transistor, and the data signal is transmitted to the second transistor; When the data signal received by the second transistor is at a first potential, the first terminal of the second transistor is electrically disconnected from the second terminal of the second transistor, and when the data signal received by the second transistor is at a second potential, the first terminal of the second transistor is electrically connected to the second terminal of the second transistor, and the power signal is transmitted to the light emitting unit.

20. The display device according to claim 18 .

20. a first end of the first light emitting element and a first end of the second light emitting element are both electrically connected to a second end of the second transistor, and a second end of the first light emitting element and a second end of the second light emitting element are both electrically connected to the control unit; the control unit is configured to receive a first signal and a second signal, and control, according to a potential of the first signal and a potential of the second signal, such that a second end of the first light-emitting element and / or a second end of the second light-emitting element are electrically connected to the first power source; the control unit is further configured to control the second end of the first light-emitting element or the second end of the second light-emitting element to be electrically connected to a second power source, thereby causing the first light-emitting element to release charges accumulated therein, or causing the second light-emitting element to release charges accumulated therein; When the first signal received by the control unit is at a first potential and the second signal received by the control unit is at a first potential, a second end of the first light-emitting element is electrically connected to the first power supply and configured to receive a first cathode voltage from the first power supply, the first light-emitting element is used to emit light, and a second end of the second light-emitting element is electrically connected to the second power supply and configured to receive a second cathode voltage from the second power supply; When the first signal received by the control unit is at a second potential and the second signal received by the control unit is at a first potential, a second end of the second light-emitting element is electrically connected to the first power supply and configured to receive the first cathode voltage from the first power supply, and the second light-emitting element is used to emit light, and a second end of the first light-emitting element is electrically connected to the second power supply and configured to receive the second cathode voltage from the second power supply; When the second signal received by the control unit is at a second potential, the second end of the first light-emitting element and the second end of the second light-emitting element are both electrically connected to the first power source and are configured to simultaneously receive the first cathode voltage from the first power source, and both the first light-emitting element and the second light-emitting element are used to emit light.

20. The display device according to claim 19 .

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