Display panel and display device

Abstract

The application relates to a display panel and a display device, which comprise a pixel driving module, a light-emitting pixel, a switching module and a control module. A first end of the pixel driving module is used for accessing a data signal, a second end of the pixel driving module is used for accessing a light-emitting control signal, and the pixel driving module is used for outputting a driving current corresponding to the data signal through a third end of the pixel driving module in a light-emitting stage in response to the light-emitting control signal being enabled and the data signal being received in a data writing stage. A cathode of the light-emitting pixel is used for accessing a negative power supply voltage, and the light-emitting pixel is used for emitting light in the case of receiving the driving current. The switching module is connected with the third end of the pixel driving module and an anode of the light-emitting pixel respectively. The control module is used for controlling the switching module to disconnect the connection between the anode of the light-emitting pixel and the third end of the pixel driving module in the light-emitting stage in the case that the voltage of the data signal received in the data writing stage is less than a start-up voltage. The application can improve the phenomenon of black bias bright.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to display panels and display devices. Background Technology

[0002] Current displays, such as OLED (Organic Light-Emitting Diode) screens, have become mainstream, and the characteristics of flexible screens meet the design needs of 3C products. 3C products such as smartphones, tablets, smartwatches, wearable smart products, and dashboards are increasingly featuring 3D designs. Smartphones with higher screen ratios offer a superior visual experience and a wider field of view.

[0003] However, when an OLED display is powered on and a black screen is displayed, it is prone to appearing too bright. Summary of the Invention

[0004] Therefore, it is necessary to provide a display panel and display device that can improve the phenomenon of black appearing too bright, in order to address the above-mentioned technical problems.

[0005] In a first aspect, this application provides a display panel, comprising:

[0006] A pixel driving module, wherein a first terminal of the pixel driving module is used to receive a data signal, a second terminal of the pixel driving module is used to receive a light emission control signal, and the pixel driving module is used to output a driving current corresponding to the data signal through a third terminal of the pixel driving module in response to the light emission control signal that is enabled during the light emission stage, based on the data signal received during the data writing stage.

[0007] The light-emitting pixel has a cathode that is connected to a negative power supply voltage and is used to emit light when it receives the driving current.

[0008] The switching module is connected to the third terminal of the pixel driving module and the anode of the light-emitting pixel, respectively.

[0009] A control module, connected to the switch module, is used to control the switch module to disconnect the connection between the anode of the light-emitting pixel and the third terminal of the pixel driving module during the light-emitting stage when the voltage of the data signal received during the data writing stage is less than the turn-on voltage.

[0010] In one embodiment, the switching module includes:

[0011] A first switching unit, wherein a first end of the first switching unit is connected to a third end of the pixel driving module, a second end of the first switching unit is connected to the anode of the light-emitting pixel, and a controlled end of the first switching unit is connected to the control module;

[0012] The control module controls the first switching unit to disconnect during the light-emitting stage when the voltage of the data signal received during the data writing stage is less than the turn-on voltage.

[0013] In one embodiment, the switch module further includes;

[0014] The second switching unit has a first end for receiving the light emission control signal, a second end for connecting to the anode of the light emission pixel, and a controlled end for connecting to the control module.

[0015] The control module is configured to, during the light-emitting phase, control the first switching unit to disconnect and control the second switching unit to turn on when the voltage of the data signal received during the data writing phase is less than the turn-on voltage; the voltage difference between the voltage corresponding to the effective light-emitting control signal and the negative power supply voltage is less than the turn-on voltage of the light-emitting pixel.

[0016] In one embodiment, the control module is further configured to control the switch module to connect the connection between the anode of the light-emitting pixel and the third terminal of the pixel driving module during the light-emitting stage, so that the light-emitting pixel emits light, when the voltage of the data signal received during the data writing stage is greater than or equal to the turn-on voltage.

[0017] In one embodiment, it further includes:

[0018] A light emission detection module, connected to the control module, is used to detect the light emission parameters of the light emission pixel;

[0019] The control module is also used to control the switching module to disconnect the connection between the anode of the light-emitting pixel and the third terminal of the pixel driving module during the light-emitting stage when the light-emitting parameters meet the preset conditions and the voltage of the data signal received during the data writing stage is less than the turn-on voltage.

[0020] In one embodiment, the control module is further configured to control the switch module to connect the anode of the light-emitting pixel to the third terminal of the pixel driving module when the light-emitting parameters do not meet the preset conditions.

[0021] In one embodiment, the light emission parameters include the anode potential of the light-emitting pixel; the light emission detection module includes:

[0022] A voltage detection unit is connected to the anode of the light-emitting pixel and the control module, and is used to detect the anode potential of the light-emitting pixel;

[0023] The control module is further configured to, during the light-emitting stage, control the switching module to disconnect the connection between the anode of the light-emitting pixel and the third terminal of the pixel driving module when the difference between the anode potential of the light-emitting pixel and the negative power supply voltage is greater than or equal to the turn-on voltage of the light-emitting pixel, and the voltage of the data signal received during the data writing stage is less than the turn-on voltage.

[0024] In one embodiment, the light emission parameters include the brightness of the light-emitting pixel; the light emission detection module includes:

[0025] A brightness detection unit, connected to the control module, is used to detect the brightness of the light-emitting pixels;

[0026] The control module is further configured to, during the light-emitting stage, control the switching module to disconnect the connection between the anode of the light-emitting pixel and the third terminal of the pixel driving module when the brightness of the light-emitting pixel is greater than or equal to a preset brightness and the voltage of the data signal received during the data writing stage is less than the turn-on voltage.

[0027] In one embodiment, the control module is further configured to, upon receiving an externally input control command and when the voltage of the data signal received during the data writing phase is less than the turn-on voltage, control the switching module to disconnect the connection between the anode of the light-emitting pixel and the third terminal of the pixel driving module during the light-emitting phase.

[0028] Secondly, this application also provides a display device, including the display panel as described above.

[0029] The aforementioned display panel and display device include a pixel driving module, a light-emitting pixel, a switching module, and a control module. The pixel driving module, based on the data signal received during the data writing phase, outputs a driving current corresponding to the data signal in response to an enabled light-emitting control signal during the light-emitting phase. The light-emitting pixel emits light upon receiving the driving current. If the voltage of the data signal received during the data writing phase is less than the activation voltage, the control module controls the switching module to disconnect the connection between the anode of the light-emitting pixel and the third terminal of the pixel driving module during the light-emitting phase. In this application, the voltage of the data signal received during the data writing phase being less than the activation voltage indicates that the light-emitting pixel should be in a black state, i.e., a non-light-emitting state. Therefore, controlling the switching module to disconnect the connection between the anode of the light-emitting pixel and the third terminal of the pixel driving module during the light-emitting phase prevents the light-emitting pixel from receiving driving current, thus avoiding light emission and improving the phenomenon of excessive brightness in black areas. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is one of the structural schematic diagrams of a display panel in one embodiment of this application;

[0032] Figure 2 This is one of the structural schematic diagrams of the switch module in one embodiment of this application;

[0033] Figure 3 This is a second schematic diagram of the structure of the switch module in one embodiment of this application;

[0034] Figure 4 This is a second schematic diagram of the structure of the display panel in one embodiment of this application;

[0035] Figure 5 This is a schematic diagram of the pixel driving module in one embodiment of this application;

[0036] Figure 6 This is a schematic diagram of the structure of a display device according to an embodiment of this application.

[0037] Explanation of icon numbers:

[0038] 100: Display panel; 110: Pixel driving module; 120: Light-emitting pixel; 130: Switching module; 131: First switching unit; 132: Second switching unit; 140: Control module; 150: Light emission detection module; 10: Display device. Detailed Implementation

[0039] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0041] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0042] In the accompanying drawings, the dimensions of layers and regions may be exaggerated for clarity. It is understood that when a layer or element is referred to as "on" another layer or substrate, the layer or element may be directly on said other layer or substrate, or there may be intermediate layers. Furthermore, it is understood that when a layer is referred to as "between" two layers, the layer may be the only layer between said two layers, or there may be one or more intermediate layers. Additionally, the same reference numerals always denote the same elements.

[0043] In the following embodiments, when a layer, region, or element is “connected,” it can be interpreted as the layer, region, or element being connected not only directly but also through other constituent elements placed therebetween. For example, when a layer, region, element, etc., is described as being connected or electrically connected, the layer, region, element, etc., can not only be directly connected or directly electrically connected, but can also be connected or electrically connected through another layer, region, element, etc., placed therebetween.

[0044] In the following text, although terms such as “first” and “second” may be used to describe various components, these components are not necessarily limited to the terms above. The terms above are only used to distinguish one component from another. It will also be understood that expressions used in the singular form include plural expressions, unless the singular form has a distinctly different meaning in the context.

[0045] When a phrase such as “at least one of…” follows a list of elements, it modifies the entire list of elements, not individual elements within that list. The term “and / or” as used herein includes any and all combinations of one or more of the associated listed items. As used in the application documents, the term “and / or” includes any and all combinations of one or more of the associated listed items. It should also be understood that terms such as “comprising / including” or “having” specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0046] Electronic or electrical devices and / or any other related devices or components (e.g., display devices including a display panel and a display panel driver, wherein the display panel driver further includes a drive controller, a gate driver, a gamma reference voltage generator, a data driver, and a transmit driver) according to embodiments of the concepts described herein can be implemented using any suitable hardware, firmware (e.g., application-specific integrated circuits), software, or a combination of software, firmware, and hardware. For example, various components of these devices may be formed on an integrated circuit (IC) chip or on a separate IC chip. Additionally, various components of these devices may be implemented on a flexible printed circuit film, a tape-on-a-package (TCP), a printed circuit board (PCB), or formed on a substrate. Furthermore, various components of these devices may be processes or threads running on one or more processors in one or more computing devices to execute computer program instructions and interact with other system components to perform the various functions described herein. Computer program instructions are stored in memory, which may be implemented in a computing device using standard storage devices such as random access memory (RAM). Computer program instructions may also be stored in other non-transitory computer-readable media such as CD-ROMs, flash drives, etc. Furthermore, those skilled in the art will recognize that the functions of various computing devices may be combined or integrated into a single computing device, or the functions of a particular computing device may be distributed across one or more other computing devices, without departing from the spirit and scope of the exemplary embodiments of the present application.

[0047] While exemplary embodiments of the display module and the display device including the display module have been specifically described herein, many modifications and variations will be apparent to those skilled in the art. Therefore, it will be understood that the display module and the display device including the display module, constructed according to the principles of this application, may be implemented in ways other than those specifically described herein. This application is also defined in the claims and their equivalents.

[0048] As mentioned in the background section, current displays exhibit a phenomenon where the black appears brighter when the screen is powered on, and the color of this brightening is not fixed; it can appear reddish, greenish, or bluish. The adjustable range of Vdate (data signal voltage) is divided into an upper limit VGMP and a lower limit VGSP. The lower the black-state voltage, the lower the VGMP. Due to current IC limitations, excessively high VGMPs cannot be achieved. The black-state voltage can also be understood as the activation voltage, i.e., the minimum voltage required for a light-emitting pixel to begin emitting light. If this voltage is exceeded, the light-emitting pixel (such as in OLED) will activate. The VGMP setting for the black state is affected by factors such as IC capabilities, algorithmic compensation, leakage current or electrical settings in the pixel driver module, the activation voltage of the light-emitting pixel, and the voltage difference across its terminals.

[0049] Further research by the inventors revealed that, in order to improve the color shift problem caused by the varying lifespans of different colored light-emitting pixels in a display screen, the lifespan of red light-emitting pixels is generally longer than that of green light-emitting pixels, and the lifespan of green light-emitting pixels is longer than that of blue light-emitting pixels. Correspondingly, the aperture ratio of red light-emitting pixels is the smallest among the three colors, and consequently, the capacitance of red light-emitting pixels is also the smallest among the three colors. Therefore, when the IC capability is fixed and cannot be adjusted, red light-emitting pixels tend to emit light in the black state, resulting in the black state not being black but instead appearing reddish.

[0050] It is understandable that in other displays, blacks may appear greenish or bluish rather than black. This application does not impose specific restrictions on this, and the above description is only for illustrative purposes.

[0051] In the embodiments of this application, "black state" and "black screen" both refer to the requirement that the screen be displayed as black (the luminous pixels should not emit light).

[0052] For the reasons mentioned above, this application provides a display panel and display device that can improve the phenomenon of black appearing too bright.

[0053] The display panel in this application embodiment can be applied in a display device. The display panel can be an organic light-emitting diode (OLED) display panel, or it can be other types of display panels, such as micro light-emitting diode (Micro-LED), quantum light-emitting diode (QLED) display panels, or other suitable types of display panels.

[0054] See Figure 1 , Figure 1 This illustration shows one of the structural schematic diagrams of a display panel 100 according to an embodiment of this application. The display panel 100 provided in this embodiment includes a pixel driving module 110, light-emitting pixels 120, a switching module 130, and a control module 140. A first terminal of the pixel driving module 110 is used to receive a data signal Data, and a second terminal is used to receive a light-emitting control signal EM. The pixel driving module 110 is used to output a driving current corresponding to the data signal Data in response to the enabled light-emitting control signal EM during the light-emitting phase, based on the data signal Data received during the data writing phase. The cathode of the light-emitting pixel 120 is connected to a negative power supply voltage ELVSS, and the light-emitting pixel 120 emits light when it receives the driving current. The switching module 130 is connected to both the third terminal of the pixel driving module 110 and the anode of the light-emitting pixel 120. The control module 140 is connected to the switch module 130 and is used to control the switch module 130 to disconnect the connection between the anode of the light-emitting pixel 120 and the third terminal of the pixel driving module 110 during the light-emitting stage when the voltage of the data signal Data received during the data writing stage is less than the turn-on voltage.

[0055] The pixel driving module 110 can be a 7T2C (7 Transistors and 1 Capacitor) driving module, or a driving module modified based on the 7T2C concept (such as 8T2C, 9T2C, etc.), and is not limited to this.

[0056] The data writing stage and the light emission stage refer to the working stages of the pixel driving module 110. In addition to the data writing stage and the light emission stage, a reset stage may also be included. The data access stage can also be called the compensation stage. In the reset stage, the pixel driving module 110 uses a reset voltage Vint to charge and reset the light-emitting pixel 120, eliminating residual voltage from the previous frame and ensuring that the light-emitting pixel 120 is in a consistent state at the start of a new frame period. In the data writing stage (compensation stage), the pixel driving module 110 uses a data signal Data and stores the voltage corresponding to Data in a storage capacitor to provide the voltage for driving the light-emitting pixel 120. In the light emission stage, the pixel driving circuit uses a light emission control signal EM. The voltage stored in the storage capacitor is converted into a driving current by a transistor. At this time, the pixel driving module 110 uses a positive power supply voltage ELVDD, causing the transistor drain driving current to flow to the light-emitting pixel 120, thereby illuminating the light-emitting pixel 120. It is understandable that being in a light-emitting state does not necessarily mean that the light-emitting pixel 120 is in a light-emitting state at this stage. If the voltage of the data signal Data that is connected during the data writing stage is less than the turn-on voltage, then even if the pixel driving module 110 is connected to the light-emitting control signal EM that enables the light emission during the light-emitting stage, the light-emitting pixel 120 will not emit light.

[0057] For example, the enabling light control signal EM can be a low-level signal.

[0058] The light-emitting pixel 120 can be any light-emitting element such as OLED, QLED, or Micro-LED. It can be flexibly set according to needs in practical applications. In this embodiment, no specific restrictions are made on the type of light-emitting pixel 120.

[0059] The control module 140 may be a module responsible for receiving external input signals, processing data, and controlling the pixel driving module 110 of the display panel 100 to achieve correct image display. It can be set as one or more modules as needed. When there are multiple control modules 140, the multiple control modules 140 can interact with each other to achieve the implementation purpose in this application embodiment. No specific restrictions are made in this embodiment.

[0060] In this embodiment, the voltage of the data signal Data received during the data writing stage is less than the turn-on voltage, indicating that the light-emitting pixel 120 should be in a black state, i.e., not emitting light. At this time, the control switch module 130 disconnects the connection between the anode of the light-emitting pixel 120 and the third terminal of the pixel driving module 110 during the light-emitting stage. The light-emitting pixel 120 will not receive driving current, thus preventing the light-emitting pixel 120 from emitting light and improving the phenomenon of black being too bright.

[0061] Combination Figure 2 As shown, Figure 2 The diagram shows one of the structural schematic diagrams of the switch module 130 in one embodiment of this application. In some embodiments, the switch module 130 includes a first switch unit 131, a first end of the first switch unit 131 is connected to the third end of the pixel driving module 110, a second end of the first switch unit 131 is connected to the anode of the light-emitting pixel 120, and a controlled end of the first switch unit 131 is connected to the control module 140.

[0062] In this embodiment, the first switching unit 131 controls the connection between the anode of the light-emitting pixel 120 and the third terminal of the pixel driving module 110. When the voltage of the data signal Data received during the data writing stage is less than the turn-on voltage, the connection between the anode of the light-emitting pixel 120 and the third terminal of the pixel driving module 110 is disconnected under the control of the control module 140, thereby cutting off the transmission path of the driving current input to the light-emitting pixel 120 and preventing the driving current from flowing into the light-emitting pixel 120 so that the light-emitting pixel 120 does not emit light in the dark state.

[0063] Combined with appendix Figure 3 As shown, attached Figure 3 This is a second schematic diagram of the structure of the switch module 130 in one embodiment of this application. In some embodiments, the switch module 130 may include a second switch unit 132 in addition to the first switch unit 131. The first end of the first switch unit 131 is connected to the third end of the pixel driving module 110, the second end of the first switch unit 131 is connected to the anode of the light-emitting pixel 120, and the controlled end of the first switch unit 131 is connected to the control module 140. The first end of the second switch unit 132 is used to receive the light-emitting control signal EM, the second end of the second switch unit 132 is connected to the anode of the light-emitting pixel 120, and the controlled end of the second switch unit 132 is connected to the control module 140. The control module 140 is used to control the first switch unit 131 to disconnect and the second switch unit 132 to turn on during the light-emitting stage when the voltage of the data signal Data received during the data writing stage is less than the turn-on voltage. The voltage difference between the voltage corresponding to the effective light-emitting control signal EM and the negative power supply voltage ELVSS is less than the turn-on voltage of the light-emitting pixel 120.

[0064] The first switch unit 131 and the second switch unit 132 can be any controlled switch. In this embodiment, no specific restrictions are placed on the types of the first switch unit 131 and the second switch unit 132.

[0065] Understandably, when only the first switch unit 131 is set, the control module 140 controls the first switch unit 131 to be disconnected. Although this can directly cut off the transmission path of the driving current input to the light-emitting pixel 120, the anode of the light-emitting pixel 120 is in an open circuit state with the third terminal of the light-emitting driving module. That is, the anode potential of the light-emitting pixel 120 is floating. It may also be affected by the surrounding circuit or environment, causing unnecessary current to be introduced through other paths (such as parasitic capacitance or leakage path), affecting the display quality in the black state (that is, when the voltage of the data signal Data received during the data writing stage is less than the turn-on voltage). In this embodiment, a second switching unit 132 is further provided. The control module 140 turns on the second switching unit 132 in the black state (that is, when the voltage of the data signal Data received during the data writing stage is less than the turn-on voltage), so that the effective light-emitting control signal EM is turned on to the light-emitting pixel 120. This allows for more precise control of current injection, preventing the light-emitting pixel 120 from being turned on by introducing unnecessary current through other paths. This ensures that the voltage difference between the voltage corresponding to the effective light-emitting control signal EM and the negative power supply voltage ELVSS is less than the turn-on voltage of the light-emitting pixel 120, ensuring that the light-emitting pixel 120 does not emit light and improving the stability of the display panel 100.

[0066] In one embodiment, the control module is further configured to control the switch module to connect the connection between the anode of the light-emitting pixel and the third terminal of the pixel driving module during the light-emitting stage when the voltage of the data signal received during the data writing stage is greater than or equal to the turn-on voltage, so as to make the light-emitting pixel emit light.

[0067] For example, the switching module includes a first switching unit. When the voltage of the data signal received by the control module during the data writing stage is greater than or equal to the turn-on voltage, i.e. in a non-black state, the control module controls the first switching unit to be turned on during the light-emitting stage, so that the driving current corresponding to the data signal is normally conducted to the light-emitting pixel, so that the light-emitting pixel emits light normally.

[0068] In another exemplary embodiment, the switching module includes a first switching unit and a second switching unit. When the voltage of the data signal received by the control module during the data writing phase is greater than or equal to the activation voltage (i.e., in a non-blackout state), the control module can also control the switching module to connect the anode of the light-emitting pixel to the third terminal of the pixel driving module and stop transmitting the light-emitting control signal to the anode of the light-emitting pixel. Therefore, when the voltage of the data signal received by the control module during the data writing phase is greater than or equal to the activation voltage (i.e., in a non-blackout state), the control module can also control the first switching unit to conduct and the second switching unit to disconnect, allowing the light-emitting pixel to emit light normally.

[0069] Combination Figure 4 As shown, Figure 4 The second schematic diagram shows the structure of a display panel 100 according to one embodiment of this application. In some embodiments, the display panel 100 may further include a light emission detection module 150. The light emission detection module 150 is connected to the control module 140 and is used to detect the light emission parameters of the light emission pixel 120. The control module 140 may also be used to control the switch module 130 to disconnect the connection between the anode of the light emission pixel 120 and the third terminal of the pixel driving module 110 during the light emission stage when the light emission parameters meet preset conditions and the voltage of the data signal Data received during the data writing stage is less than the turn-on voltage.

[0070] The light emission parameters can be parameters that characterize the light emission state of the light emission pixel 120, such as the anode voltage of the light emission pixel 120, the light emission brightness of the light emission pixel 120, and the grayscale value of the light emission pixel 120. For example, if the grayscale value of the light emission pixel 120 is greater than or equal to a preset grayscale value (e.g., grayscale 1), it is determined that the light emission pixel 120 is emitting light.

[0071] The light emission detection module 150 can be any circuit or module capable of detecting corresponding light emission parameters. For example, if the light emission parameters include the anode voltage of the light-emitting pixel 120, the light emission detection module 150 may include a voltage detection unit. If the light emission parameters include the light emission brightness of the light-emitting pixel 120, the light emission detection module 150 may include a brightness detection unit. To improve detection accuracy, in other embodiments, the light emission detection module 150 may also include two or more detection units for multiple detection. In practical applications, it can be flexibly configured as needed and is not limited to the above examples.

[0072] It is understood that when the switch module 130 only includes the first switch unit 131, the control module 140 can also be used to control the first switch unit 131 to disconnect the connection between the anode of the light-emitting pixel 120 and the third terminal of the pixel driving module 110 during the light-emitting stage when the light-emitting parameters meet the preset conditions and the voltage of the data signal Data received during the data writing stage is less than the turn-on voltage.

[0073] When the switching unit includes a first switching unit 131 and a second switching unit 132, the control module 140 can also be used to control the first switching unit 131 to disconnect the connection between the anode of the light-emitting pixel 120 and the third terminal of the pixel driving module 110 during the light-emitting stage, and control the second switching unit 132 to conduct, so as to conduct the effective light-emitting control signal EM to the light-emitting pixel 120. The voltage difference between the voltage corresponding to the effective light-emitting control signal EM and the negative power supply voltage ELVSS is less than the turn-on voltage of the light-emitting pixel 120. Based on controlling the light-emitting pixel 120 not to emit light, the stability of the display panel 100 is improved.

[0074] In this embodiment, whether the corresponding light-emitting pixel 120 emits light can be detected by whether the light-emitting parameters meet preset conditions. If the light-emitting parameters meet the preset conditions, it indicates that the light-emitting pixel 120 emits light. Combined with the judgment condition that the voltage of the data signal Data received during the data writing stage is less than the turn-on voltage, it can be determined that the corresponding light-emitting pixel 120 should be in a black state. If the light-emitting parameters meet the preset conditions and the voltage of the data signal Data received during the data writing stage is less than the turn-on voltage, it indicates that the light-emitting pixel 120, which should be in a black state, emits light. At this time, the control module 140 controls the switch module 130 to disconnect the connection between the anode of the light-emitting pixel 120 and the third terminal of the pixel driving module 110, thereby achieving precise control.

[0075] In some embodiments, the control module can also be used to control the switch module to conduct the connection between the anode of the light-emitting pixel and the third terminal of the pixel driving module when the light-emitting parameters do not meet the preset conditions.

[0076] Similar to the previous embodiment, when the switching module includes a first switching unit, the control module can control the first switching unit to connect the anode of the light-emitting pixel to the third terminal of the pixel driving module when the light-emitting parameters do not meet the preset conditions.

[0077] When the switching module includes a first switching unit and a second switching unit, the control module can also be used to control the switching module to connect the anode of the light-emitting pixel to the third terminal of the pixel driving module and stop the light-emitting control signal from being transmitted to the anode of the light-emitting pixel when the light-emitting parameters do not meet the preset conditions. Therefore, the control module can also control the first switching unit to be turned on and the second switching unit to be turned off when the light-emitting parameters do not meet the preset conditions.

[0078] In this embodiment, if the light emission parameters do not meet the preset conditions, it means that the corresponding light emission pixel is not emitting light. At this time, regardless of whether the voltage of the data signal received during the data writing stage is less than the turn-on voltage, the switch module can be controlled to conduct the connection between the anode of the light emission pixel and the third terminal of the pixel driving module, so as to avoid affecting the normal driving of the pixel driving module.

[0079] In some embodiments, exemplarily, the light emission parameter includes the anode potential of the light-emitting pixel. The light emission detection module may include a voltage detection unit. The voltage detection unit is connected to the anode of the light-emitting pixel and the control module, and is used to detect the anode potential of the light-emitting pixel. The control module may also be used to control the switching module to disconnect the connection between the anode of the light-emitting pixel and the third terminal of the pixel driving module during the light emission stage when the difference between the anode potential of the light-emitting pixel and the negative power supply voltage is greater than or equal to the turn-on voltage of the light-emitting pixel, and the voltage of the data signal received during the data writing stage is less than the turn-on voltage.

[0080] The voltage detection unit can be any component or circuit capable of voltage detection. This embodiment does not impose specific limitations on the voltage detection unit.

[0081] In this embodiment, the anode potential of the light-emitting pixel is detected by the voltage detection unit. If the difference between the anode potential of the light-emitting pixel and the negative power supply voltage is greater than or equal to the activation voltage of the light-emitting pixel, it indicates that the light-emitting pixel is at risk of emitting light. Further, it is determined whether the corresponding light-emitting pixel should be in a black state. If the voltage of the data signal received during the data writing stage is less than the activation voltage, it indicates that the corresponding light-emitting pixel should be in a black state. The control switch module disconnects the connection between the anode of the light-emitting pixel and the third terminal of the pixel driving module to prevent the driving current corresponding to the data signal from being conducted to the light-emitting pixel, thus controlling the light-emitting pixel not to emit light.

[0082] In other embodiments, when the light-emitting module includes a first switching unit and a second switching unit, the control module can further control the first switching unit to open and the second switching unit to open during the light-emitting stage when the difference between the anode potential of the light-emitting pixel and the negative power supply voltage is greater than or equal to the turn-on voltage of the light-emitting pixel, and the voltage of the data signal received during the data writing stage is less than the turn-on voltage. This allows the effective light-emitting control signal to be conducted to the anode of the light-emitting pixel, and the voltage difference between the voltage corresponding to the effective light-emitting control signal and the negative power supply voltage is less than the turn-on voltage of the light-emitting pixel. This improves the stability of the display panel while controlling the light-emitting pixel not to emit light.

[0083] In some embodiments, the luminance parameter includes the brightness of the luminous pixel as an example for illustration. The luminance detection module may include a brightness detection unit. The brightness detection unit is connected to the control module and is used to detect the brightness of the luminous pixel. The control module may also be used to control the switching module to disconnect the connection between the anode of the luminous pixel and the third terminal of the pixel driving module during the luminance stage when the brightness of the luminous pixel is greater than or equal to a preset brightness and the voltage of the data signal received during the data writing stage is less than the turn-on voltage.

[0084] The brightness detection unit can be any component capable of detecting the brightness of the light-emitting pixels, such as a light sensor. It is not limited to this.

[0085] For example, the preset brightness can be 0.001 nits to 0.008 nits, such as 0.001 nits, 0.002 nits, 0.003 nits, 0.004 nits, 0.005 nits, 0.006 nits, 0.007 nits, 0.008 nits, etc., as long as it can be determined whether the light-emitting pixel is turned on, and is not limited to the above examples.

[0086] In this embodiment, the brightness of the light-emitting pixel is detected by the brightness detection unit. If the brightness of the light-emitting pixel is greater than or equal to the preset brightness, it means that the light-emitting pixel has emitted light. Further, it is determined whether the corresponding light-emitting pixel should be in a black state. If the voltage of the data signal received during the data writing stage is less than the turn-on voltage, it means that the corresponding light-emitting pixel should be in a black state. The control switch module disconnects the connection between the anode of the light-emitting pixel and the third terminal of the pixel driving module to prevent the driving current corresponding to the data signal from being conducted to the light-emitting pixel, thus controlling the light-emitting pixel not to emit light.

[0087] In other embodiments, when the light-emitting module includes a first switching unit and a second switching unit, the control module can also control the first switching unit to open and the second switching unit to open during the light-emitting stage when the brightness of the light-emitting pixel is greater than or equal to a preset brightness and the voltage of the data signal received during the data writing stage is less than the turn-on voltage. This allows the effective light-emitting control signal to be conducted to the anode of the light-emitting pixel, and the voltage difference between the voltage corresponding to the effective light-emitting control signal and the negative power supply voltage is less than the turn-on voltage of the light-emitting pixel. This improves the stability of the display panel while controlling the light-emitting pixel not to emit light.

[0088] In other embodiments, the brightness detection unit may also be located outside the display panel. For example, the display panel may be configured with a through-hole (such as a FOT (Field-Sequential Color Technology) through-hole) to allow the brightness detection unit to detect the brightness of the light-emitting pixels through the through-hole. The control module is also used to connect to the brightness detection unit and, during the light-emitting phase, control the switching module to disconnect the connection between the anode of the light-emitting pixel and the third terminal of the pixel driving module when the brightness of the light-emitting pixel is greater than or equal to a preset brightness and the voltage of the data signal received during the data writing phase is less than the turn-on voltage.

[0089] Correspondingly, the display device may include a pixel detection unit and a display panel in this embodiment, wherein the pixel detection unit is connected to the control module in the display panel in this embodiment.

[0090] In some embodiments, the control module can also be used to control the switch module to disconnect the connection between the anode of the light-emitting pixel and the third terminal of the pixel driving module during the light-emitting stage when it receives an externally input control command and the voltage of the data signal received during the data writing stage is less than the turn-on voltage.

[0091] For example, when a user uses the display panel in this embodiment and perceives that the display panel is too bright, the user inputs a control command. The control module responds to the control command by determining whether the light-emitting pixel is in a black state, that is, whether the voltage of the data signal received during the data writing stage is less than the turn-on voltage. If it is less, it means that the corresponding light-emitting pixel has turned on in a black state. The control switch module disconnects the connection between the anode of the light-emitting pixel and the third terminal of the pixel driving module, so that the light-emitting pixel stops emitting light and improves the phenomenon of being too bright in a black state.

[0092] Understandably, when the switching module includes a first switching unit and a second switching unit, the control module can also, upon receiving an externally input control command and when the voltage of the data signal received during the data writing phase is less than the activation voltage, control the switching module to disconnect the connection between the anode of the light-emitting pixel and the third terminal of the pixel driving module during the light-emitting phase. Furthermore, it can connect the effective light-emitting control signal to the anode of the light-emitting pixel, ensuring that the voltage difference between the effective light-emitting control signal and the negative power supply voltage is less than the activation voltage of the light-emitting pixel, thus preventing the light-emitting pixel from emitting light. Therefore, the control module can also, upon receiving an externally input control command and when the voltage of the data signal received during the data writing phase is less than the activation voltage, control the first switching unit to disconnect and the second switching unit to connect during the light-emitting phase, thereby improving stability.

[0093] Combination Figure 5 As shown, Figure 5The diagram shows a schematic of the structure of a pixel driving module 110 in one embodiment of this application. In some embodiments, the pixel driving module 110 may include a driving transistor T1, a data writing transistor T2, a threshold compensation transistor group (including threshold compensation transistor T3-1 and threshold compensation transistor T3-2), a gate reset transistor group (including gate reset transistor T4-1 and gate reset transistor T4-2), a first light-emitting control transistor T5, a second light-emitting control transistor T6, an anode reset transistor T7, and a storage capacitor C.

[0094] The gate of the driving transistor T1 is connected to the first terminal of the storage capacitor C, the first terminal of the gate reset transistor group, and the first terminal of the threshold compensation transistor group. The first terminal of the driving transistor T1 is connected to the first terminal of the first light-emitting transistor T5 and the second terminal of the data writing transistor T2. The second terminal of the driving transistor T1 is connected to the second terminal of the threshold compensation transistor group and the first terminal of the second light-emitting control transistor T6. The driving transistor T1 is used to provide driving current.

[0095] The gate of the data writing transistor T2 is connected to the enable gate of the threshold compensation transistor group (the gates of threshold compensation transistors T3-1 and T3-2), and is used to receive the second scan signal S2. The first terminal of the data writing transistor T2 is used to receive the data signal Data. The second terminal of the data writing transistor T2 is connected to the first terminal of the first light-emitting control transistor T5 and the first terminal of the driving transistor T1, respectively. The data writing transistor T2 is used to transmit the data signal Data to the driving transistor T1.

[0096] The enable terminals of the threshold compensation transistor group (the gates of threshold compensation transistor T3-1 and T3-2) are used to receive the second scan signal S2. The first terminals of the threshold compensation transistor group are connected to the first terminal of the storage capacitor C1, the gate of the driving transistor T1, and the first terminal of the gate reset transistor group, respectively. The second terminals of the threshold compensation transistor group are connected to the second terminal of the driving transistor T1 and the first terminal of the second light-emitting control transistor T6, respectively.

[0097] The enable terminal of the gate reset transistor group (i.e., the gates of gate reset transistor T4-1 and gate reset transistor T4-2) is used to receive the first scan signal S1. The second terminal of the gate reset transistor group is connected to the first terminal of the storage capacitor C1, the gate of the driving transistor T1, and the first terminal of the threshold compensation transistor group, respectively. The second terminal of the gate reset transistor group is used to receive the first initialization signal Vref1. The gate reset transistor group is used to reset the driving transistor T1 according to the first initialization signal Vref1.

[0098] The first terminal of the first light-emitting control transistor T5 is connected to the second terminal of the data writing transistor T2 and the first terminal of the driving transistor T1, respectively. The second terminal of the first light-emitting control transistor T5 is connected to the second terminal of the storage capacitor C and is used to connect to the positive power supply voltage ELVDD. The gate of the first light-emitting control transistor T5 is used to receive the light-emitting control signal EM.

[0099] The first terminal of the second light-emitting control transistor T6 is connected to the second terminal of the driving transistor T1 and the second terminal of the threshold compensation transistor group. The second terminal of the second light-emitting control transistor T6 is connected to the switching module 130. The gate of the second light-emitting control transistor T6 is used to receive the light-emitting control signal EM.

[0100] The gate of the anode reset transistor T7 is used to receive the third scan signal S3. The first terminal of the anode reset transistor T7 is used to receive the second initialization signal Vref2, and the second terminal of the anode reset transistor T7 is connected to the anode of the light-emitting pixel 120 of the switching module 130. The anode reset transistor T7 is used to reset the anode of the light-emitting pixel 120 according to the second initialization signal Vref2. The cathode of the light-emitting pixel 120 is connected to the negative power supply voltage ELVSS.

[0101] Combination Figure 6 As shown, Figure 6 A schematic diagram of a display device according to one embodiment of this application is shown. In some embodiments, a display device is also provided. The display device in this embodiment may include the display panel in any of the above embodiments.

[0102] It is understood that the display device in the embodiments of this application can be any product or component with display function, such as OLED display device, QLED display device, electronic paper, mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, navigator, wearable device, Internet of Things device, etc., and the embodiments disclosed in this application do not limit this.

[0103] In the description of this specification, references to terms such as "some embodiments," "other embodiments," and "ideal embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0104] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0105] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A display panel, characterized in that, include: A pixel driving module, wherein a first terminal of the pixel driving module is used to receive a data signal, a second terminal of the pixel driving module is used to receive a light emission control signal, and the pixel driving module is used to output a driving current corresponding to the data signal through a third terminal of the pixel driving module in response to the light emission control signal that is enabled during the light emission stage, based on the data signal received during the data writing stage. The light-emitting pixel has a cathode that is connected to a negative power supply voltage and is used to emit light when it receives the driving current. The switching module is connected to the third terminal of the pixel driving module and the anode of the light-emitting pixel, respectively. A control module, connected to the switch module, is used to control the switch module to disconnect the connection between the anode of the light-emitting pixel and the third terminal of the pixel driving module during the light-emitting stage when the voltage of the data signal received during the data writing stage is less than the turn-on voltage.

2. The display panel according to claim 1, characterized in that, The switching module includes: A first switching unit, wherein a first end of the first switching unit is connected to a third end of the pixel driving module, a second end of the first switching unit is connected to the anode of the light-emitting pixel, and a controlled end of the first switching unit is connected to the control module; The control module controls the first switching unit to disconnect during the light-emitting stage when the voltage of the data signal received during the data writing stage is less than the turn-on voltage.

3. The display panel according to claim 2, characterized in that, The switch module also includes; The second switching unit has a first end for receiving the light emission control signal, a second end for connecting to the anode of the light emission pixel, and a controlled end for connecting to the control module. The control module is configured to, during the light-emitting phase, control the first switching unit to disconnect and control the second switching unit to turn on when the voltage of the data signal received during the data writing phase is less than the turn-on voltage; the voltage difference between the voltage corresponding to the effective light-emitting control signal and the negative power supply voltage is less than the turn-on voltage of the light-emitting pixel.

4. The display panel according to claim 1, characterized in that, The control module is also used to control the switch module to connect the connection between the anode of the light-emitting pixel and the third terminal of the pixel driving module during the light-emitting stage when the voltage of the data signal received during the data writing stage is greater than or equal to the turn-on voltage, so as to make the light-emitting pixel emit light.

5. The display panel according to claim 1, characterized in that, Also includes: A light emission detection module, connected to the control module, is used to detect the light emission parameters of the light emission pixel; The control module is also used to control the switching module to disconnect the connection between the anode of the light-emitting pixel and the third terminal of the pixel driving module during the light-emitting stage when the light-emitting parameters meet the preset conditions and the voltage of the data signal received during the data writing stage is less than the turn-on voltage.

6. The display panel according to claim 5, characterized in that, The control module is also used to control the switch module to connect the anode of the light-emitting pixel to the third terminal of the pixel driving module when the light-emitting parameters do not meet the preset conditions.

7. The display panel according to claim 5, characterized in that, The light-emitting parameters include the anode potential of the light-emitting pixel; The light emission detection module includes: A voltage detection unit is connected to the anode of the light-emitting pixel and the control module, and is used to detect the anode potential of the light-emitting pixel; The control module is further configured to, during the light-emitting stage, control the switching module to disconnect the connection between the anode of the light-emitting pixel and the third terminal of the pixel driving module when the difference between the anode potential of the light-emitting pixel and the negative power supply voltage is greater than or equal to the turn-on voltage of the light-emitting pixel, and the voltage of the data signal received during the data writing stage is less than the turn-on voltage.

8. The display panel according to claim 5, characterized in that, The light emission parameters include the brightness of the light-emitting pixels; The light emission detection module includes: A brightness detection unit, connected to the control module, is used to detect the brightness of the light-emitting pixels; The control module is further configured to, during the light-emitting stage, control the switching module to disconnect the connection between the anode of the light-emitting pixel and the third terminal of the pixel driving module when the brightness of the light-emitting pixel is greater than or equal to a preset brightness and the voltage of the data signal received during the data writing stage is less than the turn-on voltage.

9. The display panel according to claim 1, characterized in that, The control module is also used to control the switching module to disconnect the connection between the anode of the light-emitting pixel and the third terminal of the pixel driving module during the light-emitting stage when it receives an externally input control command and the voltage of the data signal received during the data writing stage is less than the turn-on voltage.

10. A display device, characterized in that, Includes the display panel as described in any one of claims 1 to 9.

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