Display panel, signal detection method and display device

Abstract

The application discloses a display panel, a signal detection method and a display device. The display panel comprises a sub-pixel, a first switch module and a detection module. The sub-pixel comprises a pixel circuit and a light-emitting module. The input end of the pixel circuit is electrically connected with a first power supply end. The light-emitting module and the first switch module are connected in series between the output end of the pixel circuit and a second power supply end. The input end of the detection module is electrically connected with the output end of the pixel circuit. One display frame of the display panel comprises a display stage and a detection stage. The detection module is used for detecting the signal of the output end of the pixel circuit in the detection stage. The first switch module is turned on in the display stage, and the first switch module is turned off in the detection stage. According to the embodiment of the application, the rolling dark line in the detection process of the detection chip can be eliminated, and the experience of the human eye when watching the screen body is improved.

Description

Technical Field

[0001] This application belongs to the field of display technology, and in particular relates to a display panel, a signal detection method, and a display device. Background Technology

[0002] Organic light-emitting diodes (OLEDs) and flat panel displays based on light-emitting diodes (LEDs) are widely used in various consumer electronics products such as mobile phones, televisions, laptops, and desktop computers due to their advantages such as high image quality, energy saving, thin body, and wide range of applications, becoming the mainstream of display devices.

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

[0004] This application provides a display panel, a signal detection method, and a display device, which solves the problem that the user's viewing experience is poor when the detection chip produces scrolling dark lines on the screen during the detection process.

[0005] In a first aspect, embodiments of this application provide a display panel, including a sub-pixel, a first switching module, and a detection module. The sub-pixel includes a pixel circuit and a light-emitting module, wherein:

[0006] The input terminal of the pixel circuit is electrically connected to the first power supply terminal, the light-emitting module and the first switch module are connected in series between the output terminal and the second power supply terminal of the pixel circuit, and the input terminal of the detection module is electrically connected to the output terminal of the pixel circuit.

[0007] A display frame of a display panel includes a display phase and a detection phase;

[0008] The detection module is used to detect the signal at the output of the pixel circuit during the detection phase;

[0009] The first switch module is turned on during the display phase and turned off during the detection phase.

[0010] In one possible implementation of the first aspect, the output terminal of the pixel circuit is electrically connected to the first terminal of the light-emitting module; the first switching module is connected between the second terminal of the light-emitting module and the second power supply terminal.

[0011] Preferably, the first switching module includes a first transistor, the gate of the first transistor serves as the control terminal of the first switching module, the first electrode of the first transistor is electrically connected to the second terminal of the light-emitting module, and the second electrode of the first transistor is electrically connected to the second power supply terminal.

[0012] Preferably, different sub-pixels are connected to the same first switch module;

[0013] Preferably, the gate of the first transistor is electrically connected to the light-emitting control signal terminal, and the light-emitting control signal terminal is configured with a global light-emitting control signal.

[0014] In one possible implementation of the first aspect, the first switching module is connected between the output terminal of the pixel circuit and the first terminal of the light-emitting module, and the second terminal of the light-emitting module is electrically connected to the second power supply terminal.

[0015] Preferably, the first switching module includes a first transistor, the gate of the first transistor serves as the control terminal of the first switching module, the first electrode of the first transistor is electrically connected to the output terminal of the pixel circuit, and the second electrode of the first transistor is electrically connected to the first terminal of the light-emitting module.

[0016] Preferably, different sub-pixels are connected to different first switch modules, and the control terminals of the first switch modules to which different sub-pixels are connected are configured with the same control signal, and each first switch module is disconnected during the detection phase.

[0017] Preferably, the control signal configured on the control terminal of the first switch module has the same timing as the tearing signal;

[0018] Preferably, the gate of the first transistor is electrically connected to the light-emitting control signal terminal, and the light-emitting control signal terminal is configured with a global light-emitting control signal.

[0019] In one possible implementation of the first aspect, within a display frame, the duration of the display phase is longer than the duration of the detection phase;

[0020] Preferably, the detection phase is the disappearance phase.

[0021] In one possible implementation of the first aspect, the detection module includes a detection chip and a second switch module;

[0022] The first end of the second switch module serves as the input end of the detection module, and the second end of the second switch module is electrically connected to the input end of the detection chip.

[0023] Preferably, the second switch module is connected to each sub-pixel in a one-to-one correspondence;

[0024] Preferably, the second ends of multiple second switch modules connected to the same column of sub-pixels are connected to the same input terminal of the detection chip.

[0025] In one possible implementation of the first aspect, the control terminals of the second switch modules connected to different row sub-pixels are configured with different control signals;

[0026] Preferably, the control terminals of multiple second switch modules connected to the same row of sub-pixels are connected to the same scan line, and the control terminals of the second switch modules connected to different rows of sub-pixels are connected to different scan lines.

[0027] In one possible implementation of the first aspect, the detection module is configured to detect only the signal at the output of the pixel circuit in the same row during a detection phase;

[0028] Preferably, the detection module is configured to detect the signal at the output of the pixel circuit line by line.

[0029] In one possible implementation of the first aspect, the second switching module includes a second transistor, the first electrode of the second transistor serving as the first terminal of the second switching module, the second electrode of the second transistor serving as the second terminal of the second switching module, and the gate of the second transistor serving as the control terminal of the second switching module.

[0030] Preferably, the pixel circuit includes a driving transistor, a third transistor, and a first capacitor;

[0031] The first terminal of the driving transistor is electrically connected to the first power supply terminal, and the second terminal of the driving transistor is electrically connected to the input terminal of the detection module.

[0032] The first terminal of the third transistor is electrically connected to the data line, the second terminal of the third transistor is electrically connected to the gate of the driving transistor, and the gate of the third transistor is electrically connected to the first scan line.

[0033] The first terminal of the first capacitor is electrically connected to the first power supply terminal, and the second terminal of the capacitor is electrically connected to the gate of the driving transistor.

[0034] Based on the same inventive concept, in a second aspect, embodiments of this application also provide a signal detection method for a display panel. The display panel includes a sub-pixel, a first switching module, and a detection module. The sub-pixel includes a pixel circuit and a light-emitting module, wherein:

[0035] The input terminal of the pixel circuit is electrically connected to the first power supply terminal, the light-emitting module and the first switch module are connected in series between the output terminal and the second power supply terminal of the pixel circuit, and the input terminal of the detection module is electrically connected to the output terminal of the pixel circuit.

[0036] A display frame of a display panel includes a display phase and a detection phase;

[0037] The method includes:

[0038] The control detection module detects the signal at the output of the pixel circuit during the detection phase;

[0039] The first switch module is turned on during the display phase and turned off during the detection phase.

[0040] Based on the same inventive concept, in a third aspect, embodiments of this application also provide a display device, the display device including the first aspect and the display panel of any embodiment of the first aspect.

[0041] The display panel, signal detection method, and display device of this application embodiment include a sub-pixel, a first switching module, and a detection module. The sub-pixel includes a pixel circuit and a light-emitting module, wherein: the input terminal of the pixel circuit is electrically connected to a first power supply terminal, the light-emitting module and the first switching module are connected in series between the output terminal of the pixel circuit and the second power supply terminal, and the input terminal of the detection module is electrically connected to the output terminal of the pixel circuit; a display frame of the display panel includes a display stage and a detection stage; the detection module is used to detect the signal at the output terminal of the pixel circuit during the detection stage; the first switching module is turned on during the display stage and turned off during the detection stage. Therefore, the first switching module can prevent multiple rows of light-emitting modules from emitting light when the detection module performs current detection. That is, when the detection module detects a certain row of pixels, it can prevent the sub-pixels of the detected row and other rows of sub-pixels from emitting light, which can eliminate the scrolling dark lines of the display panel during the detection process and improve the user experience when viewing the screen. Attached Figure Description

[0042] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram illustrating the display effect of related technologies during signal detection;

[0044] Figure 2 This is a schematic diagram of a display panel provided in an embodiment of this application;

[0045] Figure 3 This is another structural schematic diagram of the display panel provided in the embodiments of this application;

[0046] Figure 4 This is another structural schematic diagram of the display panel provided in the embodiments of this application;

[0047] Figure 5 This is another structural schematic diagram of the display panel provided in the embodiments of this application;

[0048] Figure 6 This is another structural schematic diagram of the display panel provided in the embodiments of this application;

[0049] Figure 7 This is a schematic diagram of the driving timing of a display panel provided in an embodiment of this application;

[0050] Figure 8 This is a schematic diagram showing the display effect during signal detection in an embodiment of this application. Detailed Implementation

[0051] The features and exemplary embodiments of various aspects of this application will now be described in detail. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain this application and are not configured to limit this application. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples of this application.

[0052] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0053] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0054] Various modifications and variations can be made to this application without departing from its spirit or scope, which will be apparent to those skilled in the art. Therefore, this application is intended to cover modifications and variations falling within the scope of the corresponding claims (the claimed technical solutions) and their equivalents. It should be noted that the embodiments provided in this application can be combined with each other without contradiction.

[0055] Before describing the technical solutions provided in the embodiments of this application, in order to facilitate understanding of the embodiments of this application, this application first specifically explains the problems existing in the related technologies:

[0056] During the production of OLED display panels, due to the limitations of the crystallization process, TFTs at different locations often exhibit non-uniformity in electrical parameters such as threshold voltage and mobility. This non-uniformity translates into differences in current and brightness in OLED display devices, which are perceived by the human eye, known as the Mura phenomenon.

[0057] Mura compensation methods can be divided into two main categories: internal compensation and external compensation.

[0058] Internal compensation refers to the method of compensation using sub-circuits constructed within the pixel using TFT (Thin Film Transistor). However, the compensation range of internal compensation is limited. When the threshold voltage Vth deviation exceeds a certain range (usually ΔVth≥0.5V), the consistency of the current cannot be guaranteed. Therefore, external compensation has emerged.

[0059] External compensation refers to a method of sensing the electrical or optical characteristics of pixels through external driving circuits or devices and then compensating for them; this is known as Demura compensation. External compensation can be divided into optical external compensation and electrical external compensation depending on the type of data signal extracted.

[0060] External optical compensation refers to extracting the brightness signal by taking a picture with an industrial optical camera CCD after the back panel is lit. Because optical compensation requires specialized equipment, it can only be initialized and calibrated before leaving the factory and cannot be compensated during product use.

[0061] External electrical compensation refers to extracting the electrical signals of TFT or OLED through the sensing circuit of the detection chip. Specifically, the IV characteristics of the driving transistor and the OLED device are read from the TFT inside the pixel and sent to the external sensing circuit to determine the new gamma value. The driving voltage value that needs to be compensated is calculated and fed back to the chip of the driving panel to achieve compensation. External electrical compensation can achieve real-time compensation, that is, it can continuously compensate during use throughout the product life cycle, which can effectively improve the product life.

[0062] In related technologies, screens with external electrical compensation functions, during the detection phase, when the external detection chip detects the current of a certain row of sub-pixels, the sub-pixels in the detected row do not emit light, while the sub-pixels in other rows emit light normally. Although the duration is very short, a dark line appears at different positions in each frame. For example, as... Figure 1As shown, during the display phase of the first frame image, the screen displays normally with a brightness of A. During the detection phase of the first frame image, only one row is detected. The detected row does not emit light, while other rows emit light normally, and so on. Since each detection phase detects one row, a scrolling dark line will appear on the screen during the detection process. Visually, a scrolling dark line will appear on the screen, resulting in a poor user experience when viewing the screen.

[0063] Based on this, embodiments of this application provide a display panel, a signal detection method, and a display device, which can solve the problem that the user's viewing experience is poor when the detection chip produces scrolling dark lines on the screen during the detection process.

[0064] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0065] Figure 2 This is a schematic diagram of the structure of a display panel provided in an embodiment of this application, such as... Figure 2 As shown, the display panel includes sub-pixels, a first switching module 30, and a detection module 40. The sub-pixels include pixel circuitry 10 and a light-emitting module 20, wherein:

[0066] The input terminal of the pixel circuit 10 is electrically connected to the first power supply terminal. The light-emitting module 20 and the first switch module 30 are connected in series between the output terminal and the second power supply terminal of the pixel circuit 10. The input terminal of the detection module 40 is electrically connected to the output terminal of the pixel circuit 10.

[0067] A display frame of a display panel includes a display phase and a detection phase;

[0068] Detection module 40 is used to detect the signal at the output terminal of pixel circuit 10 during the detection phase;

[0069] The first switch module 30 is turned on during the display phase and turned off during the detection phase.

[0070] The first power supply terminal can be configured with a first power signal ELVDD.

[0071] The second power supply terminal can be configured with a second power supply signal ELVSS.

[0072] A sub-pixel may include a pixel circuit 10 and a light-emitting module 20, wherein the pixel circuit 10 and the light-emitting module 20 may be connected in series. The pixel circuit 10 may generate a driving current to drive the light-emitting module 20 to emit light during the light-emitting phase.

[0073] The first switch module 30 is connected in series with the output terminal of the light-emitting module 20, the pixel circuit 10, and the second power supply terminal. Therefore, the on / off state of the first switch module 30 can control whether the light-emitting module 20 can emit light. For example, if the first switch module 30 is turned on during the display phase, it means that the light-emitting module is allowed to emit light, so the sub-pixels can emit light during the light-emitting phase of the display phase. As another example, if the first switch module 30 is turned off during the detection phase, it can prevent multiple rows of light-emitting modules 20 from emitting light. That is, when the detection module 40 detects a certain row of pixels, it can prevent the sub-pixels of the detected row and other rows of sub-pixels from emitting light, which can eliminate the scrolling dark lines of the detection chip during the detection process and improve the user experience when viewing the screen.

[0074] The detection module 40 has its input terminal electrically connected to the output terminal of the pixel circuit 10, so it can detect the current signal at the output terminal of the pixel circuit 10 during the detection phase.

[0075] A display frame, or image refresh frame, can include a display phase and a detection phase.

[0076] The display phase can include a data writing phase and a light emission phase, so subpixels can emit light during the light emission phase of the display phase.

[0077] The detection phase refers to the stage where the detection module 40 detects the current signal output by the pixel circuit 10 of a certain row of sub-pixels. After the detection module 40 detects the current signal output by the pixel circuit 10 of a certain row, it recalculates the new gamma value based on the current signal. This process continues, and with M rows of sub-pixels in the entire screen, the new gamma value of all M rows of sub-pixels can be determined through M detection phases. This new gamma value can then be used for compensation, enabling real-time compensation. In other words, compensation is continuously performed during use throughout the product's lifecycle, effectively extending the product's lifespan.

[0078] It should be noted that the main function of the detection module 40 is to determine the gamma value based on the detected current. Therefore, the detection module can be used to determine the gamma value for screen compensation before leaving the factory, and can also be used to determine a new gamma value during use. This prevents the problem of unsatisfactory compensation effect when using the original gamma value after the screen ages. It can continuously adjust the gamma value during use, effectively improving the product's lifespan. For example, during use, the user can trigger the detection module 40 to determine a new gamma value through a target control, or automatically when a preset usage time is reached. Through M detection stages, the new gamma value of the M rows of sub-pixels on the entire screen can be determined. Furthermore, during the detection process, the first switch module 30 can control all rows to not emit light, thereby eliminating the scrolling dark lines of the detection chip during the detection process and improving the user experience when viewing the screen.

[0079] Specifically, such as Figure 2 As shown, the display panel includes sub-pixels, a first switch module 30, and a detection module 40. Each sub-pixel includes a pixel circuit 10 and a light-emitting module 20. The input terminal of the pixel circuit 10 is electrically connected to a first power supply terminal. The light-emitting module 20 and the first switch module 30 are connected in series between the output terminal of the pixel circuit 10 and the second power supply terminal. The input terminal of the detection module is electrically connected to the output terminal of the pixel circuit 10. Since the first switch module 30 is connected in series with the light-emitting module 20, the output terminal of the pixel circuit 10, and the second power supply terminal, controlling the on / off state of the first switch module 30 can control whether the light-emitting module 20 emits light. Therefore, during the detection phase, turning off the first switch module 30 can prevent multiple rows of light-emitting modules from emitting light. That is, when the detection module detects a certain row of pixels, the sub-pixels of the detected row and other rows of sub-pixels can be prevented from emitting light, eliminating the scrolling dark lines observed by the detection chip during the detection process and improving the viewing experience for the human eye.

[0080] In some embodiments, see Figure 3 The output terminal of the pixel circuit 10 is electrically connected to the first terminal of the light-emitting module 20; the first switch module 30 is connected between the second terminal of the light-emitting module 20 and the second power supply terminal.

[0081] For example, the first switching module 30 includes a first transistor, the gate of the first transistor serves as the control terminal of the first switching module 30, the first electrode of the first transistor is electrically connected to the second terminal of the light-emitting module 20, and the second electrode of the first transistor is electrically connected to the second power supply terminal.

[0082] For example, different sub-pixels are connected to the same first switch module 30.

[0083] Specifically, such as Figure 3 As shown, the pixel circuit 10, the light-emitting module 20, and the first switch module 30 can be connected in series. The on / off state of the first switch module 30 determines whether the light-emitting module 20 can be electrically connected to the second power supply terminal. For example, when the first switch module 30 is on, the light-emitting module 20 is electrically connected to the second power supply terminal, that is, the light-emitting module 20 is allowed to emit light. When the first switch module 30 is off, the light-emitting module 20 loses electrical connection to the second power supply terminal, that is, the light-emitting module 20 is not allowed to emit light. Thus, the first switch module 30 can control whether the light-emitting module 20 can emit light. This can be used to control all rows of light-emitting modules 20 to not emit light during the detection phase, eliminating the scrolling dark lines of the detection chip during the detection process and improving the user experience when viewing the screen.

[0084] For a specific example, see [link to example]. Figure 3The first switching module 30 may include a first transistor. The gate of the first transistor can serve as the control terminal of the first switching module 30, receiving a control signal. The first terminal of the first transistor is electrically connected to the second terminal of the light-emitting module 20, and the second terminal of the first transistor is electrically connected to the second power supply terminal. Therefore, the first transistor can be turned on / off in response to the control signal received at its gate. When the control signal received at the gate of the first transistor is a valid signal, the first transistor is turned on, the light-emitting module 20 is electrically connected to the second power supply terminal, and the light-emitting module is allowed to emit light. Conversely, when the control signal received at the gate of the first transistor is an invalid signal, the first transistor is turned off, the light-emitting module 20 loses electrical connection to the second power supply terminal, and the light-emitting module is not allowed to emit light. Thus, the first transistor can control whether the light-emitting module can emit light. This can be used to control all rows to not emit light during the detection phase, eliminating the scrolling dark lines of the detection chip during the detection process and improving the user experience when viewing the screen.

[0085] For another specific example, please refer to [link / reference]. Figure 3Through research, the inventors discovered that when the first switch module 30 is connected between the second end of the light-emitting module 20 and the second power supply end, different sub-pixels can be connected to the same first switch module 30 for the following reasons: 1) Since the main function of the first switch module 30 is to allow the light-emitting modules of the entire screen to emit light during the light-emitting phase of the display phase, or not to allow the light-emitting modules of the entire screen to emit light during the detection phase, that is, the main function of the first switch module 30 is to disconnect the electrical connection between the light-emitting modules of the entire screen and the second power supply end during the detection phase. Therefore, the timing of the control signals configured on the control end of the first switch module 30 of the entire screen is the same. 2) Since the first switch module 30 is connected between the second end of the light-emitting module 20 and the second power supply end, the second power supply end can be configured with a global second power signal ELVSS. That is, the second power supply end can be a surface electrode, that is, the second power signal ELVSS can be output through a power supply pin. Therefore, a first switch module 30 can be connected in series near the power supply pin used to output the second power signal ELVSS. The second power signal ELVSS is transmitted to the second end of the light-emitting module 20 after passing through the first switch module 30. Therefore, the first switch module 30 can control whether ELVSS can be transmitted to the light-emitting modules of the whole screen, thereby realizing the function of allowing the light-emitting modules of the whole screen to emit light, or disallowing the light-emitting modules of the whole screen to emit light. In view of this, all sub-pixels of the screen can share a single first switch module 30, meaning different sub-pixels can be connected to the same first switch module 30. This reduces the number of first switch modules 30, as well as the number of components and wiring. Only one pin needs to be led out to control the first switch module 30, which reduces the number of pins and saves resources. It also eliminates the scrolling dark lines caused by the detection chip during the detection process, improves the viewing experience for the human eye, increases resolution, reduces costs, and saves resources.

[0086] For another specific example, please refer to [link / reference]. Figure 3 The gate of the first transistor can be electrically connected to an existing light-emitting control signal terminal, which is configured with a global light-emitting control signal. The global light-emitting control signal can control the first transistors across the entire screen to synchronously turn on or off, eliminating the need for separate control lines for each transistor and thus saving wiring resources.

[0087] In some embodiments, see Figure 4 The first switch module 30 is connected between the output terminal of the pixel circuit 10 and the first terminal of the light-emitting module 20, and the second terminal of the light-emitting module 20 is electrically connected to the second power supply terminal.

[0088] For example, the first switching module 30 includes a first transistor, the gate of the first transistor serves as the control terminal of the first switching module 30, the first electrode of the first transistor is electrically connected to the output terminal of the pixel circuit 10, and the second electrode of the first transistor is electrically connected to the first terminal of the light-emitting module 20.

[0089] For example, different sub-pixels are connected to different first switch modules 30, and the control terminals of the first switch modules 30 to which different sub-pixels are connected are configured with the same control signal, and each first switch module 30 is disconnected during the detection phase.

[0090] For example, the control signal configured on the control terminal of the first switch module 30 has the same timing as the tear signal;

[0091] For example, the gate of the first transistor is electrically connected to the light-emitting control signal terminal.

[0092] Specifically, see Figure 4 The pixel circuit 10, the first switch module 30, and the light-emitting module 20 can be connected in series. The on / off state of the first switch module 30 determines whether the light-emitting module 20 and the pixel circuit 10 can be electrically connected. For example, when the first switch module 30 is on, the light-emitting module 20 is electrically connected to the pixel circuit 10, that is, the light-emitting module 20 is allowed to emit light. When the first switch module 30 is off, the light-emitting module 20 loses its electrical connection with the pixel circuit 10, that is, the light-emitting module 20 is not allowed to emit light. Thus, the first switch module 30 can control whether the light-emitting module 20 can emit light. This can be used to control all rows of light-emitting modules 20 to not emit light during the detection phase, eliminating the scrolling dark lines of the detection chip during the detection process and improving the user experience when viewing the screen.

[0093] For a specific example, see [link to example]. Figure 4 When the first switch module 30 is connected in series between the pixel circuit 10 and the light-emitting module 20, the control terminals of the first switch module 30 connected to different sub-pixels can be configured with the same control signal. That is, the timing of the control signals of the control terminals of the first switch module 30 throughout the screen is the same. However, since the first switch module 30 is connected in series between the pixel circuit 10 and the light-emitting module 20, different sub-pixels need to be connected to different first switch modules 30. Because the same control signal can be configured for the control terminals of the first switch module 30 connected to different sub-pixels, the control signal can be output through a single pin, reducing the number of pins and saving resources.

[0094] In a specific example, different sub-pixels are connected to different first switch modules 30, and the control terminals of the first switch modules 30 connected to different sub-pixels are configured with the same control signal. All first switch modules 30 are disconnected during the detection phase. By connecting different first switch modules 30 to different sub-pixels and allowing the control terminals of these switch modules to share the same control signal, all first switch modules 30 can be disconnected uniformly during the detection phase, simplifying the control logic and reducing the complexity of the control signals, while ensuring that all sub-pixels are in a consistent disconnected state during detection.

[0095] For another specific example, please refer to [link / reference]. Figure 4 The control signal configured at the control terminal of the first switch module 30 has the same timing as the tearing signal (TE).

[0096] The TE signal is the image frame refresh signal, which triggers screen refresh and indicates the start of a new image frame. Display drivers typically wait for the TE signal to arrive before starting to refresh the image. The high-level segment of the TE signal is the non-display phase, also known as the blanking region; the low-level segment of the TE signal is the display phase, also known as the active refresh region. For example, when ready to refresh the next image frame, the chip's TE pin outputs a high-level TE signal, indicating that the current phase is non-display and the chip can receive the next frame of digital image signal; when the chip's TE pin outputs a low-level TE signal, it indicates that the display phase has begun and the digital image signal has started to be displayed on the screen.

[0097] Specifically, when the TE signal is high, the system enters the Porch blanking region. The control signal configured at the control terminal of the first switching module 30 is an invalid signal. For example, if the first switching module 30 includes a P-type transistor, the gate of the P-type transistor is configured with a high-level signal, and the entire first switching module is turned off, preventing all the light-emitting modules on the screen from emitting light. Similarly, when the TE signal is low, the system enters the effective refresh region. The control signal configured at the control terminal of the first switching module 30 is an effective signal. For example, if the first switching module 30 includes a P-type transistor, the gate of the P-type transistor is configured with a low-level signal, and the entire first switching module is turned on, without affecting the normal display of sub-pixels. Therefore, the timing of the control signal configured at the control terminal of the first switching module 30 is the same as that of the TE tear signal, allowing them to share a single signal line, reducing the number of pins and wiring, saving resources, and lowering costs.

[0098] For another specific example, please refer to [link / reference]. Figure 4The gate of the first transistor can be electrically connected to the light-emitting control signal terminal, which is configured with a global light-emitting control signal. The global light-emitting control signal can control the first transistors across the entire screen to be synchronously turned on or off, eliminating the need for a separate control line for each transistor and thus saving wiring resources.

[0099] In some embodiments, within a display frame, the duration of the display phase is longer than the duration of the detection phase;

[0100] For example, the detection phase is the blanking zone.

[0101] Specifically, within the same display frame, the duration of the display phase is longer than the duration of the detection phase. For example, in a display phase, all sub-pixels in all rows of the screen need to go through the data writing and light emission phases; while in a detection phase, only a certain row is detected. Therefore, the duration of the display phase is much longer than the duration of the detection phase, that is, the non-light emission time Tb of the Porch area << the normal light emission time Ta. Especially when the screen is displaying at a high refresh rate, this change cannot be perceived from the visual effect observed by the human eye. Therefore, compared with the traditional display detection method, the embodiments of this application have greatly improved the presentation effect.

[0102] In some embodiments, see Figure 5 The detection module 40 includes a second switch module 41 and a detection chip 42;

[0103] The first end of the second switch module 41 serves as the input end of the detection module 40, and the second end of the second switch module 41 is electrically connected to the input end of the detection chip 42.

[0104] For example, the second switch module 41 is connected to each sub-pixel in a one-to-one correspondence;

[0105] For example, the second ends of multiple second switch modules 41 connected to the same column of sub-pixels are connected to the same input terminal of the detection chip 42.

[0106] Specifically, see Figure 5 The detection module 40 may include a second switch module 41 and a detection chip 42. The first terminal of the second switch module 41 can serve as the input terminal of the detection module 40, and the second terminal of the second switch module 41 can be electrically connected to the input terminal of the detection chip 42. Thus, by controlling the on / off state of the second switch module, the current signals of different sub-pixels can be sampled to the detection chip, thereby realizing the sampling of the current signal at the output terminal of the pixel circuit.

[0107] For a specific example, see [link to example]. Figure 5The second switch module 41 can be connected one-to-one with each sub-pixel to transmit the current signal from the pixel circuit output of the sub-pixel to the input of the detection chip 42, thereby achieving current sampling. For example, when detecting the sub-pixel in the (k-1)th row, the second switch module 41 in the (k-1)th row is turned on, while the second switch modules 41 in the other rows are turned off. The second switch module 41 in the (k-1)th row transmits the sampled current to different inputs of the detection chip 42, thus enabling rapid current detection of the (k-1)th row.

[0108] For another specific example, please refer to [link / reference]. Figure 5 The second ends of multiple second switch modules 41 connected to the same column of sub-pixels are connected to the same input terminal of the detection chip 42, and the second ends of multiple second switch modules 41 connected to different columns of sub-pixels are connected to different input terminals of the detection chip 42. Therefore, the detection chip 42 can perform current detection in a single row, and the second ends of multiple second switch modules 41 connected to each column of sub-pixels only need to be connected to the same input terminal of the detection chip 42, which saves the number of pins, reduces wiring, and saves resources and costs.

[0109] In some embodiments, the control terminals of the second switch module 41 connected to different rows of sub-pixels are configured with different control signals;

[0110] For example, the control terminals of multiple second switch modules 41 connected to the same row of sub-pixels are connected to the same scan line, while the control terminals of the second switch modules 41 connected to different rows of sub-pixels are connected to different scan lines.

[0111] Specifically, since the number of input terminals of the detection chip 42 used for current sampling is the same as the number of columns of sub-pixels, the control terminals of multiple second switch modules 41 connected to sub-pixels in the same row can be connected to the same scan line. This scan line can control the second switch modules 41 in the same row to be turned on / off simultaneously, thus allowing unified control of whether to sample the current of the sub-pixels in that row through a single scan line. Furthermore, the control terminals of the second switch modules 41 connected to sub-pixels in different rows can be connected to different scan lines. This allows for configuring a valid signal only on the scan signal line connected to the control terminal of the second switch module 41 in that row when detecting the current of a certain row, making all the second switch modules in that row turn on, while simultaneously configuring an invalid signal on the scan signal line connected to the control terminal of the second switch modules 41 in other rows, making all the second switch modules 41 in other rows turn off. For example, when a valid signal is transmitted on the scan line, all the second switch modules 41 in the same row controlled by the scan line are turned on. Therefore, the detection chip 42 can quickly detect the current of each sub-pixel in that row through multiple input terminals, thus quickly completing the detection of the current in that row.

[0112] In some embodiments, the detection module 40 is configured to detect only the signal at the output of the pixel circuit 10 in the same row within a detection phase;

[0113] For example, the detection module 40 is configured to detect the signal at the output of the pixel circuit line by line.

[0114] Specifically, the detection module 40 is configured to detect only the signal at the output of the pixel circuit 10 in the same row within a detection phase. In other words, a detection phase only needs to detect the current of one row of sub-pixels. For example, when displaying each frame of image data, the sub-pixels of the entire screen will go through a data writing phase, an illumination phase, and a single-row detection phase. The single-row detection phase only needs to detect the current at the output of the driving circuit of a single row of sub-pixels. In a detection phase, only one row is detected, so the duration of the display phase is much longer than the duration of the detection phase, i.e., the non-illuminating time Tb of the Porch area << the normal illumination time Ta. Especially when the screen is displaying at a high refresh rate, this change cannot be perceived by the human eye. Therefore, compared with the traditional detection display method, the embodiments of this application have greatly improved the presentation effect.

[0115] In a specific example, the detection module 40 is configured to detect the signal at the output terminal of the pixel circuit 10 line by line. For example, when displaying the first frame of image data, the sub-pixels of the entire screen will go through the data writing and light emission stages, and then enter the detection stage to detect the current at the output terminal of the driving circuit of the first row of sub-pixels; when displaying the second frame of image data, the sub-pixels of the entire screen will again go through the data writing and light emission stages, and then enter the detection stage to detect the current at the output terminal of the driving circuit of the second row of sub-pixels, and so on. Each time a frame of image data is displayed, the sub-pixels of the entire screen will go through the data writing, light emission stages and the single-line detection stage, so that the current of the first row, second row, third row, ..., Mth row of sub-pixels can be detected, and thus the detection module can perform line-by-line detection of the signal at the output terminal of the pixel circuit 10. During line-by-line detection, since the single-line detection phase and the display phase alternate, and the duration of the display phase is much longer than that of the single-line detection phase, the change cannot be perceived by the human eye when the screen is displaying at a high refresh rate. Therefore, compared with traditional detection and display methods, the embodiments of this application have greatly improved the presentation effect. Furthermore, during the single-line detection phase, i.e. when detecting a certain line, the first switch module can control all light-emitting modules to not emit light, which can eliminate the scrolling dark lines of the detection chip during the detection process, further improving the user experience when viewing the screen.

[0116] In some embodiments, such as Figure 6As shown, the second switching module 41 includes a second transistor, the first terminal of the second transistor serves as the first terminal of the second switching module 41, the second terminal of the second transistor serves as the second terminal of the second switching module 41, and the gate of the second transistor serves as the control terminal of the second switching module 41.

[0117] Specifically, the second switching module 41 may include a second transistor. The first terminal of the second transistor can serve as the first terminal of the second switching module 41, the second terminal of the second transistor can serve as the second terminal of the second switching module 41, and the gate of the second transistor can serve as the control terminal of the second switching module 41. Thus, by controlling the on / off state of the second transistor, the current signals of different sub-pixels can be sampled to the detection chip, thereby realizing the sampling of the current signal at the output of the pixel circuit.

[0118] In a specific example, a schematic diagram of the display panel structure is shown below. Figure 6 As shown, the pixel circuit 10 has a 2T1C structure, the light-emitting module 20 includes a light-emitting element OLED, and the first switching module 30 is connected between the OLED cathode and the second power supply terminal. The first scan signal (SCAN signal) is used to control the transmission of the data signal Vdata on the data line to the gate of the driving transistor line by line, and then the driving transistor generates a driving current according to the data signal Vdata to drive the OLED to emit light; the scan signal DET is used to control the on / off of the second switching module 41, which can sample the current signal of different sub-pixels to the detection chip, thereby realizing the sampling of the current signal at the output of the pixel circuit.

[0119] In yet another specific example, see [link to example]. Figure 6 The pixel circuit 10 includes a driving transistor DT, a third transistor T3, and a first capacitor C;

[0120] The first terminal of the driving transistor DT is electrically connected to the first power supply terminal, and the second terminal of the driving transistor DT is electrically connected to the input terminal of the detection module 40.

[0121] The first terminal of the third transistor T3 is electrically connected to the data line DataLine, the second terminal of the third transistor T3 is electrically connected to the gate of the driving transistor DT, and the gate of the third transistor T3 is electrically connected to the first scan line SCAN.

[0122] The first terminal of the first capacitor C is electrically connected to the first power supply terminal, and the second terminal of the capacitor C is electrically connected to the gate of the driving transistor DT.

[0123] This application embodiment is passed through Figure 6The pixel circuit 10 shown integrates a driving transistor DT, a third transistor T3, and a first capacitor C. The third transistor T3 realizes the data transmission from the data line DataLine to the gate of the driving transistor under the control of the first scan line SCAN, while the first capacitor C is used to store and maintain the gate voltage, thereby precisely controlling the light emission of the light-emitting module 20 during the light emission stage.

[0124] Figure 6 The corresponding driver timing diagram, such as Figure 7 As shown, assuming the screen has M rows of sub-pixels, and each image refresh frame only detects the current of one row of sub-pixels, then M frames are needed to complete the detection of the entire screen data. Each image refresh frame includes a display phase and a detection phase. When the TE signal scans the first frame of image data, in the TE low-level region, the screen pixels enter the display phase, all rows' DET scan signals are configured as invalid signals, the second switch module 41 is turned off, and the detection chip 42 does not need to detect current. After entering the TE high-level region (Porch region), the first row's DET scan signal is configured as an valid signal, the second switch module 41 of the first row is turned on, the DET scan signals of the remaining rows are configured as invalid signals, the second switch modules 41 of the remaining rows are turned off, the detection IC detects the current data of the first row (Row1), the global EM signal is invalid in the Porch region, the first switch module 30 is turned off, thus preventing other rows of sub-pixels from emitting light. Similarly, in the Porch region of the second frame, the IC detects the current data of the second row (Row2). And so on, until all rows are detected. When detecting the current of a certain row of sub-pixels, the first switch module 30 can be turned off via the global signal EM, so that the sub-pixels of the detected row and other rows do not emit light. The display effect can be seen in [reference needed]. Figure 8 This eliminates the scrolling dark lines of the detection chip 42 during the detection process, improving the viewing experience for the human eye. Because the non-light-emitting time Tb of the Porch area is less than the normal light-emitting time Ta, especially when the screen is displaying at a high refresh rate, this change is imperceptible to the human eye, resulting in a significant improvement in the presentation effect.

[0125] It should be noted that those skilled in the art can also, according to actual needs, [details omitted]. Figure 6 The 2T1C pixel circuit shown can be transformed into a pixel circuit with other structures.

[0126] Based on the same inventive concept, this application also provides a signal detection method for a display panel. The display panel includes a sub-pixel, a first switching module, and a detection module. The sub-pixel includes a pixel circuit and a light-emitting module, wherein:

[0127] The input terminal of the pixel circuit is electrically connected to the first power supply terminal, the light-emitting module and the first switch module are connected in series between the output terminal and the second power supply terminal of the pixel circuit, and the input terminal of the detection module is electrically connected to the output terminal of the pixel circuit.

[0128] A display frame of a display panel includes a display phase and a detection phase;

[0129] The method includes steps S110 and S120:

[0130] S110 controls the detection module to detect the signal at the output of the pixel circuit during the detection phase;

[0131] S120, control the first switch module to be turned on during the display phase, and control the first switch module to be turned off during the detection phase.

[0132] Based on the same inventive concept, embodiments of this application also provide a display device, which includes the first aspect and a display panel of any embodiment of the first aspect.

[0133] The display device can be at least one of wearable devices, cameras, mobile phones, tablets, displays, televisions, and in-vehicle display terminals.

[0134] The display device includes the display panel provided in any of the above embodiments, and therefore the display device has all the beneficial effects of the above display panel.

[0135] It should be noted that in the above embodiments and accompanying drawings, all transistors can be either P-type or N-type transistors. For P-type transistors, the on-level is low, meaning a low level is a valid signal, and the off-level is high, meaning a high level is an invalid signal. For example, when the gate of a P-type transistor is low, its first and second terminals are connected; when the gate of a P-type transistor is high, its first and second terminals are off. For N-type transistors, the on-level is high, meaning a high level is a valid signal, and the off-level is low, meaning a low level is an invalid signal. For example, when the gate of an N-type transistor is high, its first and second terminals are connected; when the gate of an N-type transistor is low, its first and second terminals are off.

[0136] In specific implementation, the gate of each transistor is used as its control electrode. Furthermore, depending on the signal and type of the gate of each transistor, its first electrode can be used as the source and its second electrode as the drain, or its first electrode can be used as the drain and its second electrode as the source. No distinction is made here. In addition, the on-level and off-level in the embodiments of this application are general terms. The on-level refers to any level that can turn on the transistor, and the off-level refers to any level that can turn off / turn off the transistor.

[0137] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A display panel, characterized in that, It includes a sub-pixel, a first switching module, and a detection module. The sub-pixel includes a pixel circuit and a light-emitting module, wherein: The input terminal of the pixel circuit is electrically connected to the first power supply terminal, the light-emitting module and the first switch module are connected in series between the output terminal and the second power supply terminal of the pixel circuit, and the input terminal of the detection module is electrically connected to the output terminal of the pixel circuit. A display frame of the display panel includes a display phase and a detection phase. Within a display frame, the duration of the display phase is greater than the duration of the detection phase, and the detection phase is a blanking area. The detection module is used to detect the signal at the output terminal of the pixel circuit during the detection phase. The first switch module is turned on during the display phase and turned off during the detection phase; The detection module is configured to detect the signal at the output of the pixel circuit in the same row only during one detection phase; During line-by-line detection, the detection phase alternates with the display phase.

2. The display panel according to claim 1, characterized in that, The output terminal of the pixel circuit is electrically connected to the first terminal of the light-emitting module; the first switch module is connected between the second terminal of the light-emitting module and the second power supply terminal.

3. The display panel according to claim 2, characterized in that, The first switching module includes a first transistor, the gate of the first transistor serves as the control terminal of the first switching module, the first electrode of the first transistor is electrically connected to the second terminal of the light-emitting module, and the second electrode of the first transistor is electrically connected to the second power supply terminal.

4. The display panel according to claim 2, characterized in that, Different sub-pixels are connected to the same first switch module.

5. The display panel according to claim 3, characterized in that, The gate of the first transistor is electrically connected to the light emission control signal terminal, which is configured with a global light emission control signal.

6. The display panel according to claim 1, characterized in that, The first switch module is connected between the output terminal of the pixel circuit and the first terminal of the light-emitting module, and the second terminal of the light-emitting module is electrically connected to the second power supply terminal.

7. The display panel according to claim 6, characterized in that, The first switching module includes a first transistor, the gate of the first transistor serves as the control terminal of the first switching module, the first electrode of the first transistor is electrically connected to the output terminal of the pixel circuit, and the second electrode of the first transistor is electrically connected to the first terminal of the light-emitting module.

8. The display panel according to claim 6, characterized in that, Different sub-pixels are connected to different first switch modules, and the control terminals of the first switch modules to which the different sub-pixels are connected are configured with the same control signal, and each of the first switch modules is disconnected during the detection phase.

9. The display panel according to claim 6, characterized in that, The control signal configured on the control terminal of the first switch module has the same timing as the tear signal.

10. The display panel according to claim 7, characterized in that, The gate of the first transistor is electrically connected to the light emission control signal terminal, which is configured with a global light emission control signal.

11. The display panel according to claim 1, characterized in that, The detection module includes a detection chip and a second switch module; The first end of the second switch module serves as the input end of the detection module, and the second end of the second switch module is electrically connected to the input end of the detection chip.

12. The display panel according to claim 11, characterized in that, The second switch module is connected to each of the sub-pixels in a one-to-one correspondence.

13. The display panel according to claim 11, characterized in that, The second ends of multiple second switch modules connected to the sub-pixels in the same column are connected to the same input terminal of the detection chip.

14. The display panel according to claim 11, characterized in that, The control terminals of the second switch module connected to the sub-pixels in different rows are configured with different control signals.

15. The display panel according to claim 14, characterized in that, The control terminals of multiple second switch modules connected to the sub-pixels in the same row are connected to the same scan line, while the control terminals of the second switch modules connected to the sub-pixels in different rows are connected to different scan lines.

16. The display panel according to claim 11, characterized in that, The detection module is configured to detect the signal at the output of the pixel circuit line by line.

17. The display panel according to claim 11, characterized in that, The second switching module includes a second transistor, the first terminal of the second transistor serves as the first terminal of the second switching module, the second terminal of the second transistor serves as the second terminal of the second switching module, and the gate of the second transistor serves as the control terminal of the second switching module.

18. The display panel according to claim 17, characterized in that, The pixel circuit includes a driving transistor, a third transistor, and a first capacitor; The first terminal of the driving transistor is electrically connected to the first power supply terminal, and the second terminal of the driving transistor is electrically connected to the input terminal of the detection module. The first terminal of the third transistor is electrically connected to the data line, the second terminal of the third transistor is electrically connected to the gate of the driving transistor, and the gate of the third transistor is electrically connected to the first scan line. The first terminal of the first capacitor is electrically connected to the first power supply terminal, and the second terminal of the capacitor is electrically connected to the gate of the driving transistor.

19. A signal detection method for a display panel, characterized in that, The display panel includes sub-pixels, a first switching module, and a detection module. Each sub-pixel includes a pixel circuit and a light-emitting module, wherein: The input terminal of the pixel circuit is electrically connected to the first power supply terminal, the light-emitting module and the first switch module are connected in series between the output terminal and the second power supply terminal of the pixel circuit, and the input terminal of the detection module is electrically connected to the output terminal of the pixel circuit. A display frame of the display panel includes a display phase and a detection phase. Within a display frame, the duration of the display phase is greater than the duration of the detection phase, and the detection phase is a blanking area. The method includes: The detection module is controlled to detect the signal at the output of the pixel circuit during the detection phase. The first switch module is controlled to be turned on during the display phase and turned off during the detection phase. The control of the detection module to detect the signal at the output of the pixel circuit during the detection phase includes: The detection module is controlled to detect only the signal at the output terminal of the pixel circuit in the same row within one detection phase; During line-by-line detection, the detection phase is controlled to alternate with the display phase.

20. A display device, characterized in that, The display device includes a display panel as described in any one of claims 1 to 18.

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