Display panel, signal detection method and display device

Abstract

The invention 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, and 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 a signal of the output end of the pixel circuit in a detection stage; the first switch module is switched on in the display stage, and the first switch module is switched off in the detection stage. According to the embodiment of the invention, the rolling dark line of the detection chip in the detection process can be eliminated, and the experience feeling of human eyes when watching the screen body is improved.

Description

Technical Field

[0001] The present 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 Art

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

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

[0004] The embodiments of the present application provide a display panel, a signal detection method and a display device, which solve the problem that rolling dark lines appear on the screen during the detection process of the detection chip, resulting in a poor user experience when viewing the screen.

[0005] In a first aspect, an embodiment of the present application provides a display panel, including a sub-pixel, a first switch module, and a detection module, wherein the sub-pixel includes a pixel circuit and a light-emitting module, wherein:

[0006] The input end of the pixel circuit is electrically connected to the 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 the second power supply end, and the input end of the detection module is electrically connected to the output end of the pixel circuit;

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

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

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

[0010] In a possible implementation of the first aspect, the output end of the pixel circuit is electrically connected to the first end of the light emitting module; the first switch module is connected between the second end of the light emitting module and the second power supply end;

[0011] Preferably, the first switch module includes a first transistor, the gate of the first transistor serves as the control terminal of the first switch 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 a light emitting control signal terminal, and the light emitting control signal terminal is configured with a global light emitting control signal.

[0014] In a possible implementation of the first aspect, the first switch module is connected between the output end of the pixel circuit and the first end of the light emitting module, and the second end of the light emitting module is electrically connected to the second power supply end;

[0015] Preferably, the first switch module includes a first transistor, a gate of the first transistor serves as a control terminal of the first switch module, a first electrode of the first transistor is electrically connected to an output terminal of the pixel circuit, and a second electrode of the first transistor is electrically connected to a 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 connected to the different sub-pixels are configured with the same control signal, and each first switch module is disconnected during the detection phase;

[0017] Preferably, the control signal configured at the control end of the first switch module has the same timing sequence as the tearing signal;

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

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

[0020] Preferably, the detection phase is a blanking zone.

[0021] In a 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 modules are connected to the sub-pixels in a one-to-one correspondence;

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

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

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

[0027] In a possible implementation of the first aspect, the detection module is configured to detect only signals at output ends of pixel circuits in the same row in a detection phase;

[0028] Preferably, the detection module is configured to detect signals at output terminals of the pixel circuits row by row.

[0029] In a possible implementation of the first aspect, the second switch module includes a second transistor, a first electrode of the second transistor serves as a first end of the second switch module, a second electrode of the second transistor serves as a second end of the second switch module, and a gate of the second transistor serves as a control end of the second switch module;

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

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

[0032] A first electrode of the third transistor is electrically connected to the data line, a second electrode of the third transistor is electrically connected to the gate of the driving transistor, and a gate of the third transistor is electrically connected to the first scanning line;

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

[0034] Based on the same inventive concept, in a second aspect, an embodiment of the present application further provides a signal detection method for a display panel, wherein the display panel includes a sub-pixel, a first switch module, and a detection module, wherein the sub-pixel includes a pixel circuit and a light-emitting module, wherein:

[0035] The input end of the pixel circuit is electrically connected to the 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 the second power supply end, and the input end of the detection module is electrically connected to the output end of the pixel circuit;

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

[0037] The method includes:

[0038] Controlling the detection module to detect the signal at the output end of the pixel circuit during the detection phase;

[0039] The first switch module is controlled to be turned on in the display phase, and the first switch module is controlled to be turned off in the detection phase.

[0040] Based on the same inventive concept, in a third aspect, an embodiment of the present application further provides a display device, the display device comprising the display panel of the first aspect and any implementation manner of the first aspect.

[0041] The display panel, signal detection method and display device of the embodiment of the present application, the display panel includes a sub-pixel, a first switch module and a detection module, the sub-pixel includes a pixel circuit and a light-emitting module, wherein: the input end of the pixel circuit is electrically connected to the 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 the second power supply end, and the input end of the detection module is electrically connected to the output end 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 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, so the first switch module can make multiple rows of light-emitting modules not emit light when the detection module performs current detection, that is, when the detection module detects a row of pixels, the sub-pixels of the detected row and the sub-pixels of other rows can be made not to emit light, which can eliminate the rolling dark lines of the display panel during the detection process, and improve the experience of human eyes when viewing the screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0043] Figure 1 It is a schematic diagram of the display effect of the relevant technology when performing signal detection;

[0044] Figure 2 is a structural schematic diagram of a display panel provided in an embodiment of the present application;

[0045] Figure 3 is another structural schematic diagram of a display panel provided in an embodiment of the present application;

[0046] Figure 4 is another structural schematic diagram of a display panel provided in an embodiment of the present application;

[0047] Figure 5 is another structural schematic diagram of a display panel provided in an embodiment of the present application;

[0048] Figure 6 is another structural schematic diagram of a display panel provided in an embodiment of the present application;

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

[0050] Figure 8 It is a schematic diagram of a display effect when performing signal detection according to an embodiment of the present application. DETAILED DESCRIPTION

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

[0052] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0053] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0054] It is obvious to those skilled in the art that various modifications and changes can be made in the present application without departing from the spirit or scope of the present application. Therefore, the present application is intended to cover modifications and changes of the present application that fall within the scope of the corresponding claims (technical solutions for protection) and their equivalents. It should be noted that the implementation methods provided in the embodiments of the present application can be combined with each other without contradiction.

[0055] Before describing the technical solutions provided by the embodiments of the present application, in order to facilitate the understanding of the embodiments of the present application, the present application first specifically describes the problems existing in the related art:

[0056] During the production of OLED display panels, due to the limitations of the crystallization process, TFTs in different positions often have non-uniformity in electrical parameters such as threshold voltage and mobility. This non-uniformity will be converted into current differences and brightness differences in OLED display devices and will be perceived by the human eye, which is the Mura phenomenon.

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

[0058] Internal compensation refers to a method of compensation using a sub-circuit constructed by TFT (Thin Film Transistor) inside the pixel. 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 current cannot be ensured, so external compensation comes into being.

[0059] External compensation refers to a method of compensating for the electrical or optical characteristics of pixels by sensing them through an external driving circuit or device, i.e., demura compensation. External compensation can be divided into optical external compensation and electrical external compensation according to the type of data signal extracted.

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

[0061] Electrical external compensation refers to extracting the electrical signal of TFT or OLED through the sensing circuit of the detection chip, that is, reading the IV characteristics of the driving tube and the IV characteristics of the OLED device through the TFT inside the pixel to the external sensing circuit, determining the new gamma value, calculating the driving voltage value that needs to be compensated and feeding it back to the chip driving the panel to achieve compensation. Electrical external compensation can achieve real-time compensation, that is, continuous compensation during the product life cycle and during use, which can effectively increase the product life.

[0062] In the related art, for a screen with electrical external compensation function, during the detection phase, when the external detection chip detects the current of a row of sub-pixels, the sub-pixels in the detected row are not luminous, while the sub-pixels in other rows are normally luminous. Although the duration is very short, a dark line will appear at different positions in each frame. For example, Figure 1As shown, in the display stage of the first frame image, the screen displays normally with a brightness of A; in the detection stage of the first frame image, only a certain row is detected, the detected row does not emit light, and other rows emit light normally, and so on. Since one row is detected in each detection stage, a display problem of rolling dark lines will occur on the screen during the detection process. In terms of visual effect, a rolling dark line will appear on the screen, resulting in a poor user experience when viewing the screen.

[0063] Based on this, the embodiments of the present application provide a display panel, a signal detection method and a display device, which can solve the problem that the user has a poor experience when viewing the screen due to rolling dark lines appearing on the screen during the detection process of the detection chip.

[0064] The various embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0065] Figure 2 is a schematic diagram of the structure of a display panel provided in an embodiment of the present application, such as Figure 2 As shown, the display panel includes a sub-pixel, a first switch module 30 and a detection module 40, and the sub-pixel includes a pixel circuit 10 and a light-emitting module 20, wherein:

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

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

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

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

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

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

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

[0073] 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. Therefore, the on / off 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 in the display stage, it means that the light-emitting module is allowed to emit light, so the sub-pixel can emit light in the light-emitting stage of the display stage. For another example, if the first switch module 30 is disconnected in the detection stage, multiple rows of light-emitting modules 20 can be made not to emit light, that is, when the detection module 40 detects a row of pixels, the sub-pixels of the detected row and the sub-pixels of other rows can be made not to emit light, which can eliminate the rolling dark lines of the detection chip during the detection process and improve the human eye's experience when viewing the screen.

[0074] The detection module 40 has an input terminal electrically connected to the output terminal of the pixel circuit 10 , so that the current signal of the output terminal of the pixel circuit 10 can be detected during the detection phase.

[0075] A display frame, that is, an image refresh frame, may include a display phase and a detection phase.

[0076] The display phase may include a data writing phase and a light emitting phase, so the sub-pixel may emit light during the light emitting phase of the display phase.

[0077] The detection phase refers to the phase in which 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 output terminal of the pixel circuit 10 of a certain row, it will recalculate the new gamma value based on the current signal. By analogy, when there are M rows of sub-pixels on the full screen, the new gamma value of the M rows of sub-pixels on the full screen can be determined through M detection phases, so that the new gamma value can be used for compensation later, and real-time compensation can be achieved, that is, compensation is continuously performed during the use process during the product life cycle, which can effectively improve the product life.

[0078] It should be noted that the main function of the detection module 40 is to determine the gamma value based on the detection current. Therefore, the detection module can be used to determine the gamma value of screen compensation before leaving the factory, and the detection module can also be used to re-determine a new gamma value during use to prevent the problem of unsatisfactory compensation effect of still using the original gamma value after the screen is aged. The gamma value can be continuously adjusted during use to effectively improve the product life. For example, during use, the user can trigger the detection module 40 to determine a new gamma value through the target control, or automatically trigger the detection module 40 when the preset usage time is reached. The new gamma value of the M rows of sub-pixels on the full screen can be determined through M detection stages, and all rows can be controlled not to emit light during the detection process through the first switch module 30, thereby eliminating the rolling dark lines of the detection chip during the detection process and improving the experience of the human eye when viewing the screen.

[0079] Specifically, Figure 2 As shown, the display panel includes a sub-pixel, a first switch module 30 and a detection module 40, wherein the sub-pixel includes a pixel circuit 10 and a light-emitting module 20, wherein the input end of the pixel circuit 10 is electrically connected to the first power supply end, the light-emitting module 20 and the first switch module 30 are connected in series between the output end of the pixel circuit 10 and the second power supply end, and the input end of the detection module is electrically connected to the output end of the pixel circuit 10. Since the first switch module 30 is connected in series with the light-emitting module 20, the output end of the pixel circuit 10 and the second power supply end, whether the light-emitting module 20 can emit light can be controlled by controlling the on / off of the first switch module 30. Therefore, in the detection stage, the first switch module 30 is disconnected, so that multiple rows of light-emitting modules are not emitted, that is, when the detection module detects a row of pixels, the sub-pixels of the detected row and the sub-pixels of other rows are not emitted, which can eliminate the rolling dark lines of the detection chip during the detection process and improve the experience of human eyes when viewing the screen.

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

[0081] Exemplarily, the first switch module 30 includes a first transistor, the gate of the first transistor serves as the control terminal of the first switch 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] Exemplarily, different sub-pixels are connected to the same first switch module 30 .

[0083] Specifically, Figure 3 As shown, the pixel circuit 10, the light emitting module 20, and the first switch module 30 can be connected in series in sequence, and the on / off 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 turned 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, and when the first switch module 30 is turned off, the light emitting module 20 loses electrical connection with the second power supply terminal, that is, the light emitting module 20 is not allowed to emit light, so that the first switch module 30 can be used to control whether the light emitting module 20 can emit light, so that in the detection stage, the light emitting modules 20 of all rows are controlled not to emit light through the first switch module 30, thereby eliminating the rolling dark lines of the detection chip during the detection process and improving the experience of the human eye when viewing the screen.

[0084] In a specific example, see Figure 3The first switch module 30 may include a first transistor, the gate of the first transistor may serve as the control terminal of the first switch module 30, receive a control signal, 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. Therefore, the first transistor may be turned on / off in response to the control signal received by the gate. When the control signal received by 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. On the contrary, when the control signal received by the gate of the first transistor is an invalid signal, the first transistor is turned off, the light emitting module 20 loses electrical connection with the second power supply terminal, and the light emitting module is not allowed to emit light. Thus, the light emitting module may be controlled to emit light through the first transistor, so that in the detection stage, all rows are controlled not to emit light through the first transistor, so as to eliminate the rolling dark lines of the detection chip during the detection process and improve the user experience when viewing the screen.

[0085] In another specific example, see Figure 3The inventors have found 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 module of the full screen to emit light during the light-emitting stage of the display stage, or not to allow the light-emitting module of the full screen to emit light during the detection stage, that is, the main function of the first switch module 30 is to disconnect the electrical connection between the light-emitting module of the full screen and the second power supply end during the detection stage, the timing of the control signal configured at the control end of the first switch module 30 of the full 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 supply signal ELVSS, that is, the second power supply end can be a surface electrode, that is, the second power supply 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 for outputting the second power supply signal ELVSS. The second power supply signal ELVSS is transmitted to the second end of the light-emitting module 20 after passing through the first switch module 30. Therefore, a first switch module 30 can be used to control whether ELVSS can be transmitted to the full-screen light-emitting module, thereby realizing the function of allowing the full-screen light-emitting module to emit light, or not allowing the full-screen light-emitting module to emit light. In view of this, all-screen sub-pixels can share a first switch module 30, that is, different sub-pixels can be connected to the same first switch module 30, which can reduce the number of first switch modules 30, reduce the number of devices and wiring, and only need one pin to lead out a control signal line to control the first switch module 30, thereby reducing the number of pins and saving resources. While eliminating the rolling dark lines of the detection chip during the detection process and improving the human eye's viewing experience when viewing the screen, it also improves the resolution, reduces costs, and saves resources.

[0086] In another specific example, see Figure 3 The gate of the first transistor can be electrically connected to the existing light-emitting control signal terminal, and the light-emitting control signal terminal is configured with a global light-emitting control signal. The global light-emitting control signal can control the first transistors of the entire screen to be synchronously turned on or off, without setting a control line for each transistor separately, thereby saving wiring resources.

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

[0088] Exemplarily, the first switch module 30 includes a first transistor, a gate of the first transistor serves as a control terminal of the first switch module 30, a first electrode of the first transistor is electrically connected to the output terminal of the pixel circuit 10, and a second electrode of the first transistor is electrically connected to the first terminal of the light emitting module 20;

[0089] Exemplarily, 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, and each first switch module 30 is disconnected during the detection phase;

[0090] Exemplarily, the control signal configured at the control end of the first switch module 30 has the same timing sequence as the tearing signal;

[0091] Exemplarily, 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 in sequence, and the on / off 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 turned 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, and when the first switch module 30 is turned off, the light emitting module 20 loses electrical connection with the pixel circuit 10, that is, the light emitting module 20 is not allowed to emit light, so that the first switch module 30 can be used to control whether the light emitting module 20 can emit light, so that in the detection stage, the light emitting modules 20 of all rows are controlled not to emit light through the first switch module 30, thereby eliminating the rolling dark lines of the detection chip during the detection process and improving the experience of the human eye when viewing the screen.

[0093] In a specific example, see 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 end 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 signal of the control end of the first switch module 30 of the full screen is the same, but the first switch module 30 is connected in series between the pixel circuit 10 and the light emitting module 20, so different sub-pixels need to be connected to different first switch modules 30. Since the control end of the first switch module 30 connected to different sub-pixels can be configured with the same control signal, the control signal can be output through one pin, which reduces the number of pins and saves 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, and each first switch module 30 is 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 signal, while ensuring that each sub-pixel is in a consistent disconnected state during detection.

[0095] In another specific example, see Figure 4 The control signal configured at the control end of the first switch module 30 has the same timing as the tearing signal (Tearing, TE).

[0096] Among them, the TE signal is the refresh signal of the image frame, which can trigger the refresh of the screen. It is a signal indicating the start of a frame of image. The display driver generally waits until the TE signal arrives before starting to refresh the image. The high-level segment of the TE signal is the non-display stage, which can also be called the blanking area (Porch); the low-level segment of the TE signal is the display stage, which can be called the effective refresh area. For example, when it is ready to refresh the next frame of the image, the TE pin of the chip will output a high-level TE signal, indicating that it is currently in the non-display stage and the chip can receive the next frame of digital image signals; when the TE pin of the chip outputs a low-level TE signal, it means that it has entered the display stage and starts to display the digital image signal on the display screen.

[0097] Specifically, when the TE signal is at a high level, the Porch blanking area is entered, and the control signal configured at the control end of the first switch module 30 is an invalid signal. For example, when the first switch module 30 includes a P-type transistor, the gate of the P-type transistor is configured with a high-level signal, and the first switch module is completely turned off, so that all the light-emitting modules of the entire screen do not emit light. Similarly, when the TE signal is at a low level, the effective refresh area is entered, and the control signal configured at the control end of the first switch module 30 is a valid signal. For example, when the first switch module 30 includes a P-type transistor, the gate of the P-type transistor is configured with a low-level signal, and the first switch module is completely turned on, which does not affect the normal display of the sub-pixel. Therefore, the control signal configured at the control end of the first switch module 30 has the same timing as the TE tearing signal, and can share a signal line, which reduces the number of pins and wiring, saves resources, and reduces costs.

[0098] In another specific example, see Figure 4The gate of the first transistor can be 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. The global light emitting control signal can control the first transistors of the entire screen to be synchronously turned on or off, without setting a control line for each transistor separately, thereby saving wiring resources.

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

[0100] Exemplarily, the detection phase is a blanking zone.

[0101] Specifically, within the same display frame, the duration of the display phase is greater than the duration of the detection phase. For example, in a display phase, sub-pixels in all rows of the full screen need to undergo data writing and light-emitting phases; and in a detection phase, only a certain row is detected. Therefore, the duration of the display phase is much greater than the duration of the detection phase, that is, the non-luminous time Tb of the Porch area << the normal luminous time Ta. In particular, when the screen is displayed at a high refresh rate, this change cannot be perceived from the visual effect observed by the human eye. Therefore, compared with the traditional detection display method, the embodiment of the present application has 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] Exemplarily, the second switch modules 41 are connected to the sub-pixels in a one-to-one correspondence;

[0105] Exemplarily, the second ends of the plurality of second switch modules 41 connected to the same column of sub-pixels are connected to the same input end 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, wherein the first end of the second switch module 41 may be used as the input end of the detection module 40, and the second end of the second switch module 41 may be electrically connected to the input end of the detection chip 42. Thus, by controlling the on / off of the second switch module, the current signals of different sub-pixels may be sampled to the detection chip, thereby realizing the current signal sampling at the output end of the pixel circuit.

[0107] In a specific example, see Figure 5The second switch module 41 can be connected to the sub-pixels one by one, and is used to transmit the current signal of the pixel circuit output end of the sub-pixel to the input end of the detection chip 42 to achieve current sampling. For example, when detecting the sub-pixels in the k-1th row, the second switch modules 41 in the k-1th row are all turned on, and the second switch modules 41 in the remaining rows are all turned off. The second switch module 41 in the k-1th row transmits the sampled current to different input ends of the detection chip 42, so that the current detection of the k-1th row can be quickly completed.

[0108] In another specific example, see Figure 5 The second ends of the multiple second switch modules 41 connected to the same column of sub-pixels are connected to the same input end of the detection chip 42, and the second ends of the multiple second switch modules 41 connected to different columns of sub-pixels are connected to different input ends of the detection chip 42. Therefore, the detection chip 42 can perform current detection in a single row, and the second ends of the multiple second switch modules 41 connected to the sub-pixels in each column only need to be connected to the same input end 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 modules 41 connected to sub-pixels in different rows are configured with different control signals;

[0110] Exemplarily, the control ends of the plurality of second switch modules 41 connected to the same row of sub-pixels are connected to the same scan line, and the control ends 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 the multiple input terminals of the detection chip 42 for current sampling is the same as the number of columns of the sub-pixels, the control terminals of the multiple second switch modules 41 connected to the sub-pixels in the same row can be connected to the same scan line, and the scan line can control the second switch modules 41 in the same row to be turned on / off at the same time, so that whether the sub-pixels in the row are current sampled can be uniformly controlled through one scan line; and the control terminals of the second switch modules 41 connected to the sub-pixels in different rows can be connected to different scan lines, so that when detecting the current of a certain row, only the scan signal line connected to the control terminal of the second switch module 41 in the row is configured with a valid signal, so that the second switch modules in the row are all turned on, and the scan signal line connected to the control terminal of the second switch modules 41 in the remaining rows is configured with an invalid signal, so that the second switch modules 41 in the remaining rows are all turned off. For example, when a valid signal is transmitted on the scan line, the second switch modules 41 in the same row controlled by the scan line are all turned on, so the detection chip 42 can quickly detect the current of each sub-pixel in the row through multiple input terminals, thereby quickly completing the detection of the current in the row.

[0112] In some embodiments, the detection module 40 is configured to detect only the signals at the output terminals of the pixel circuits 10 in the same row during a detection phase;

[0113] Exemplarily, the detection module 40 is configured to detect signals at output terminals of the pixel circuits row by row.

[0114] Specifically, the detection module 40 is configured to detect only the signal at the output end of the pixel circuit 10 of the same row in a detection stage, that is, only the current of a row of sub-pixels needs to be detected in a detection stage. For example, when displaying a frame of image data each time, the sub-pixels of the full screen will go through data writing, light-emitting stage and single-row detection stage, and the single-row detection stage only needs to detect the current at the output end of the driving circuit of a single row of sub-pixels. In a detection stage, only a certain row is detected, so the duration of the display stage is much longer than the duration of the detection stage, that is, the non-luminous time Tb of the Porch area << the normal luminous time Ta, especially when the screen is displayed at a high refresh rate, this change cannot be perceived from the visual effect observed by the human eye, so compared with the traditional detection display method, the embodiment of the present application has greatly improved the presentation effect.

[0115] In a specific example, the detection module 40 is configured to detect the signal at the output end of the pixel circuit 10 row by row. For example, when displaying the first frame of image data, the sub-pixels of the full screen will go through the data writing and light-emitting stages, and then enter the detection stage to detect the current at the output end of the driving circuit of the first row of sub-pixels; when displaying the second frame of image data, the sub-pixels of the full screen will go through the data writing and light-emitting stages again, and then enter the detection stage to detect the current at the output end of the driving circuit of the second row of sub-pixels, and so on. When displaying each frame of image data, the sub-pixels of the full screen will go through the data writing, light-emitting stages and single-row detection stages, so that the current of the sub-pixels of the first row, the second row, the third row, ..., the Mth row can be detected, so that the signal at the output end of the detection pixel circuit 10 can be detected row by row through the detection module. During line-by-line detection, since the single-line detection stage and the display stage alternate, and the duration of the display stage is much longer than that of the single-line detection stage, when the screen is displayed at a high refresh rate, the change cannot be detected from the visual effect observed by the human eye. Therefore, compared with the traditional detection and display method, the embodiment of the present application has greatly improved the presentation effect; and, in the single-line detection stage, that is, when detecting a certain row, the first switch module can control all the light-emitting modules to not emit light, which can eliminate the rolling dark lines of the detection chip during the detection process, further improving the human eye's experience when viewing the screen.

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

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

[0118] In a specific example, the structural diagram of the display panel is as follows: Figure 6 As shown, the pixel circuit 10 is a 2T1C structure, the light emitting module 20 includes a light emitting element OLED, and the first switch module 30 is connected between the cathode of the OLED and the second power supply terminal. The first scan signal (SCAN signal) is used to control the data signal Vdata on the data line Data Line to be transmitted row by row to the gate of the driving transistor, 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 switch module 41, and the current signals of different sub-pixels can be sampled to the detection chip, thereby realizing the current signal sampling at the output end of the pixel circuit.

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

[0120] A first electrode of the driving transistor DT is electrically connected to the first power supply terminal, and a second electrode of the driving transistor DT is electrically connected to the input terminal of the detection module 40;

[0121] A first electrode of the third transistor T3 is electrically connected to the data line DataLine, a second electrode of the third transistor T3 is electrically connected to the gate of the driving transistor DT, and a gate of the third transistor T3 is electrically connected to the first scan line SCAN;

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

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

[0124] Figure 6 The corresponding drive timing diagram is as follows: Figure 7 As shown, assuming that the screen has M rows of sub-pixels, each image refresh frame only detects the current of a certain row of sub-pixels, then M frames are required to complete the detection of full-screen data, and 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 area, the screen pixels enter the display phase, the DET scan signals of all rows are configured as invalid signals, the second switch module 41 is turned off, and the detection chip 42 does not need to detect the current; after entering the TE high level area (Porch area), the DET scan signal of the first row is configured as a 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, and the second switch modules 41 of the remaining rows are turned off, and the detection IC detects the current data of the first row Row1, the global EM signal is an invalid signal in the Porch area, and the first switch module 30 is turned off, so that the sub-pixels of other rows do not emit light. Similarly, in the Porch area of ​​the second frame, the IC detects the current data of the second row Row2. And so on, all rows are fully detected. When detecting the current of a certain row of sub-pixels, the first switch module 30 can be turned off by controlling the global signal EM, so that the sub-pixels of the detected row and the sub-pixels of other rows do not emit light. The display effect can be seen in FIG. Figure 8 , eliminating the rolling dark lines of the detection chip 42 during the detection process, and improving the experience of the human eye when viewing the screen, because the non-luminous time Tb of the Porch area is << the normal luminous time Ta, especially when the screen is displayed at a high refresh rate, this change cannot be detected from the visual effect observed by the human eye, and the presentation effect has been greatly improved.

[0125] It should be noted that those skilled in the art can also change Figure 6 The 2T1C pixel circuit shown is transformed into a pixel circuit of another structure.

[0126] Based on the same inventive concept, an embodiment of the present application further provides a signal detection method for a display panel, wherein the display panel includes a sub-pixel, a first switch module, and a detection module, wherein the sub-pixel includes a pixel circuit and a light-emitting module, wherein:

[0127] The input end of the pixel circuit is electrically connected to the 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 the second power supply end, and the input end of the detection module is electrically connected to the output end of the pixel circuit;

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

[0129] The method includes step S110 and step S120:

[0130] S110, controlling the detection module to detect a signal at an output end of the pixel circuit during a detection phase;

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

[0132] Based on the same inventive concept, an embodiment of the present application further provides a display device, which includes the display panel of the first aspect and any implementation manner of the first aspect.

[0133] The display device may be at least one of a wearable device, a camera, a mobile phone, a tablet computer, a display screen, a television, and a vehicle-mounted display terminal.

[0134] The display device includes the display panel provided by any one of the above embodiments, so the display device has all the beneficial effects of the above display panel.

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

[0136] In a specific implementation, the gate of each of the above-mentioned transistors serves as its control electrode, and, according to the signal of the gate of each transistor and its type, its first electrode can be used as the source and the second electrode as the drain, or its first electrode can be used as the drain and the second electrode as the source, without making any distinction here. In addition, the on-level and off-level in the embodiments of the present 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 / shut down the transistor.

[0137] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A display panel, characterized in that: It includes a sub-pixel, a first switch module and a detection module, wherein the sub-pixel includes a pixel circuit and a light-emitting module, wherein: The input end of the pixel circuit is electrically connected to the 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 the second power supply end, and the input end of the detection module is electrically connected to the output end of the pixel circuit; A display frame of the display panel includes a display phase and a detection phase; The detection module is used to detect the signal at the output end of the pixel circuit during the detection phase; The first switch module is turned on in the display phase, and the first switch module is turned off in the detection phase.

2. The display panel according to claim 1, characterized in that: The output end of the pixel circuit is electrically connected to the first end of the light emitting module; the first switch module is connected between the second end of the light emitting module and the second power supply end; Preferably, the first switch module comprises a first transistor, a gate of the first transistor serves as a control terminal of the first switch module, a first electrode of the first transistor is electrically connected to the second terminal of the light emitting module, and a second electrode of the first transistor is electrically connected to the second power supply terminal; Preferably, different sub-pixels are connected to the same first switch module; Preferably, the gate of the first transistor is electrically connected to a light emitting control signal terminal, and the light emitting control signal terminal is configured with a global light emitting control signal.

3. The display panel according to claim 1, characterized in that: The first switch module is connected between the output end of the pixel circuit and the first end of the light emitting module, and the second end of the light emitting module is electrically connected to the second power supply end; Preferably, the first switch module comprises a first transistor, a gate of the first transistor serves as a control terminal of the first switch module, a first electrode of the first transistor is electrically connected to an output terminal of the pixel circuit, and a second electrode of the first transistor is electrically connected to a first terminal of the light emitting module; Preferably, different sub-pixels are connected to different first switch modules, and control ends of the first switch modules connected to different sub-pixels are configured with the same control signal, and each of the first switch modules is disconnected during the detection phase; Preferably, the control signal configured at the control end of the first switch module has the same timing sequence as the tearing signal; Preferably, the gate of the first transistor is electrically connected to a light emitting control signal terminal, and the light emitting control signal terminal is configured with a global light emitting control signal.

4. The display panel according to claim 1, characterized in that: In one of the display frames, the duration of the display phase is longer than the duration of the detection phase; Preferably, the detection phase is a blanking zone.

5. 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; Preferably, the second switch modules are connected to the sub-pixels in a one-to-one correspondence; Preferably, the second ends of the plurality of second switch modules connected to the sub-pixels in the same column are connected to the same input end of the detection chip.

6. The display panel according to claim 5, characterized in that: The control terminals of the second switch modules connected to the sub-pixels in different rows are configured with different control signals; Preferably, control ends of the second switch modules connected to the sub-pixels in the same row are connected to the same scan line, and control ends of the second switch modules connected to the sub-pixels in different rows are connected to different scan lines.

7. The display panel according to claim 6, characterized in that: The detection module is configured to detect only the signals at the output terminals of the pixel circuits in the same row in one detection phase; Preferably, the detection module is configured to detect the signal at the output end of the pixel circuit row by row.

8. The display panel according to claim 5 or 6, characterized in that: The second switch module comprises a second transistor, the first electrode of the second transistor serves as the first end of the second switch module, the second electrode of the second transistor serves as the second end of the second switch module, and the gate of the second transistor serves as the control end of the second switch module; Preferably, the pixel circuit comprises a driving transistor, a third transistor and a first capacitor; The first electrode of the driving transistor is electrically connected to the first power supply terminal, and the second electrode of the driving transistor is electrically connected to the input terminal of the detection module; A first electrode of the third transistor is electrically connected to the data line, a second electrode of the third transistor is electrically connected to the gate of the driving transistor, and a gate of the third transistor is electrically connected to the first scan line; A first electrode of the first capacitor is electrically connected to the first power supply terminal, and a second electrode of the capacitor is electrically connected to the gate of the driving transistor.

9. A signal detection method for a display panel, characterized in that: The display panel includes a sub-pixel, a first switch module and a detection module, and the sub-pixel includes a pixel circuit and a light-emitting module, wherein: The input end of the pixel circuit is electrically connected to the 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 the second power supply end, and the input end of the detection module is electrically connected to the output end of the pixel circuit; A display frame of the display panel includes a display phase and a detection phase; The method comprises: Controlling the detection module to detect a signal at an output end of the pixel circuit during the detection phase; The first switch module is controlled to be turned on during the display phase, and the first switch module is controlled to be turned off during the detection phase.

10. A display device, characterized in that: The display device comprises the display panel according to any one of claims 1 to 8.

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