Pixel circuit, display panel, display module and electronic equipment

Abstract

The utility model provides a pixel circuit, a display panel, a display module and electronic equipment, the pixel circuit comprises a voltage stabilizing module, a light emitting module, a pixel capacitor and a first switch tube, the input end of the voltage stabilizing module and the first electrode of the first switch tube are connected with a power supply chip, and the output end of the voltage stabilizing module is connected with the first end of the pixel capacitor; a second end of the pixel capacitor is connected with a control electrode of the first switch tube; a second electrode of the first switch tube is connected with the light-emitting module; the voltage stabilizing module outputs a first voltage to the first end of the pixel capacitor based on a power supply voltage, and the voltage magnitude of the first voltage is stabilized in a target voltage interval; the first switching tube outputs a target current to the light emitting module based on a second voltage provided by the second end of the pixel capacitor and a power supply voltage, so that the light emitting brightness of the light emitting module is the target brightness; wherein the second voltage is obtained after the pixel capacitor is charged based on the first voltage. It can be guaranteed that the light-emitting brightness of the light-emitting module is accurate, water ripples are effectively reduced, and the display effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power electronics, in particular to a pixel circuit, a display panel, a display module and an electronic device. BACKGROUND

[0002] An organic light emitting diode (OLED) has the characteristics of high brightness, low power consumption, fast response, good flexibility and high luminous efficiency. When applied in a display device, the OLED can realize high-brightness, high-resolution and high-smoothness image display, and meet the new demands of consumers for display technology.

[0003] Generally, a display device provides a power voltage required for driving an OLED to emit light to a display panel through a power chip. However, the power chip is usually arranged on a mainboard far away from the display panel, so that the transmission path of the power voltage is long, the power voltage can be disturbed, and then the luminous brightness of the OLED is affected, which causes the display screen to appear water ripples and reduces the display effect. UTILITY MODEL CONTENT

[0004] The present application provides a pixel circuit, a display panel, a display module and an electronic device, which can ensure the luminous brightness of the light-emitting module, effectively reduce the generation of water ripples, and improve the display effect.

[0005] In a first aspect, the present application provides a pixel circuit, comprising a voltage stabilizing module, a light-emitting module, a pixel capacitor and a first switch tube, an input end of the voltage stabilizing module and a first electrode of the first switch tube being used for connecting a power supply chip, an output end of the voltage stabilizing module being connected to a first end of the pixel capacitor, a second end of the pixel capacitor being connected to a control electrode of the first switch tube, and a second electrode of the first switch tube being connected to the light-emitting module; the voltage stabilizing module is used for outputting a first voltage to the first end of the pixel capacitor based on a power supply voltage provided by the power supply chip, and a voltage value of the first voltage is stabilized in a target voltage interval; the first switch tube is used for outputting a target current to the light-emitting module based on a second voltage provided by the second end of the pixel capacitor and the power supply voltage, so that a light-emitting brightness of the light-emitting module is a target brightness; and the second voltage is obtained by the pixel capacitor after charging based on the first voltage. In the present application, the pixel circuit provides the first voltage to the first end of the pixel capacitor through the voltage stabilizing module, keeps the voltage value of the first end of the pixel capacitor stable in the target voltage interval, and makes the pixel capacitor charge based on the first voltage to establish the second voltage at the second end of the pixel capacitor. Since the first voltage is stabilized in the target voltage interval, the second voltage at the second end of the pixel capacitor after charging can not be deviated. Further, the pixel circuit connects the second end of the pixel capacitor to the control electrode of the first switch tube, so that the first switch tube outputs the target current based on the second voltage provided by the second end of the pixel capacitor and the power supply voltage provided by the power supply chip. Since the second voltage provided by the second end of the pixel capacitor after charging has no deviation, the target current output by the first switch tube based on the second voltage and the power supply voltage has no error, and the light-emitting module can be driven to emit light at the target brightness, so that the light-emitting brightness of the light-emitting module is accurate, the generation of water ripples of the display panel is effectively reduced, and the display effect is improved.

[0006] In a possible implementation, the pixel circuit further comprises a switch module connected to the second end of the pixel capacitor; the switch module is used for outputting a data voltage to the second end of the pixel capacitor in a charging phase of the pixel capacitor, so that the pixel capacitor charges based on the data voltage and the first voltage, and the data voltage is obtained based on the target brightness; and the switch module is further used for triggering the first switch tube to output the target current to the light-emitting module based on the second voltage provided by the second end of the pixel capacitor after charging and the power supply voltage in a discharging phase of the pixel capacitor. In the present application, the pixel circuit can make the pixel capacitor charge based on the stable first voltage and the data voltage through the switch module, and provide the second voltage at the second end of the pixel capacitor after charging to the first switch tube through the switch module, so as to drive the light-emitting module to emit light at the target brightness, which has a simple principle and strong applicability.

[0007] In a possible implementation, the switch module includes a second switch tube, a third switch tube, a fourth switch tube and a fifth switch tube, the first electrode of the second switch tube is connected to the first electrode of the first switch tube, the third switch tube is connected between the input end of the voltage stabilizing module and the first electrode of the first switch tube, the fourth switch tube is connected between the light-emitting module and the second electrode of the first switch tube, and the fifth switch tube is connected between the second end of the pixel capacitor and the second electrode of the first switch. In this application, the switch module can be composed of the second switch tube, the third switch tube, the fourth switch tube and the fifth switch tube, which has a simple structure, is easy to implement, and has low production cost.

[0008] In a possible implementation, when the first switch tube, the second switch tube and the fifth switch tube are turned on, the second electrode of the second switch tube is used to receive a data voltage to output the data voltage to the second end of the pixel capacitor; when the second switch tube and the fifth switch tube are turned off and the third switch tube and the fourth switch tube are turned on, the first switch tube outputs a target current to the light-emitting module based on the second voltage and the power supply voltage. In this application, the pixel circuit can provide the data voltage to the second end of the pixel capacitor by controlling the on or off of the switch tubes, so that the pixel capacitor is charged based on the stable first voltage and the data voltage, and the first switch tube outputs the target current to the light-emitting module by controlling the on or off of the switch tubes, which has a simple control mode and high reliability.

[0009] In a possible implementation, the pixel circuit further includes a sixth switch tube, a seventh switch tube and an eighth switch tube, the second electrode of the first switch tube is connected to the first electrode of the sixth switch tube and the first electrode of the seventh switch tube, the first electrode of the eighth switch tube is connected to the anode of the light-emitting module, and the cathode of the light-emitting module is grounded. In this application, when the pixel circuit is applied to a display panel, the pixel circuit can reduce the color deviation phenomenon of a displayed image by using the sixth switch tube, the seventh switch tube and the eighth switch tube.

[0010] In a possible implementation, when the fifth switch tube and the sixth switch tube are turned on, the second electrode of the sixth switch tube is used to receive a third voltage to reset the voltage of the second end of the pixel capacitor; when the seventh switch tube is turned on, the second electrode of the seventh switch tube is used to receive a fourth voltage to reset the voltage of the fourth switch tube; and when the eighth switch tube is turned on, the second electrode of the eighth switch tube is used to receive a fifth voltage to reset the voltage of the anode of the light-emitting module. In this application, when the pixel circuit is applied to a display panel, the pixel circuit can reset the voltages of the pixel capacitor, the fourth switch tube and the light-emitting module by controlling the on or off of the sixth switch tube, the seventh switch tube and the eighth switch tube, so as to reduce the color deviation phenomenon of a displayed image.

[0011] In a second aspect, the present application further provides a display panel, the display panel comprising a voltage stabilizing module and a plurality of light emitting circuits, an input end of the voltage stabilizing module being configured to be connected to a power supply chip, each light emitting circuit comprising a pixel capacitor, a light emitting module and a first switch tube, a first end of the pixel capacitor being connected to an output end of the voltage stabilizing module, a second end of the pixel capacitor being connected to a control electrode of the first switch tube, a first electrode of the first switch tube being configured to be connected to the power supply chip, and a second electrode of the first switch tube being connected to the light emitting module; the voltage stabilizing module being configured to output a first voltage to the first end of each pixel capacitor based on a power supply voltage provided by the power supply chip, the first voltage being stable in a target voltage range; and the first switch tube in each light emitting circuit being configured to output a target current to the light emitting module based on a second voltage provided by the second end of the pixel capacitor and the power supply voltage, so that the light emitting brightness of the light emitting module is a target brightness, the second voltage being obtained by the pixel capacitor after being charged based on the first voltage.

[0012] In a possible implementation, the display panel further comprises a first power supply interface and a second power supply interface, the first power supply interface and the second power supply interface being configured to be connected to the power supply chip, the first power supply interface being further configured to be connected to the first electrode of the first switch tube in each light emitting circuit, and the second power supply interface being further configured to be connected to the input end of the voltage stabilizing module.

[0013] In a third aspect, the present application further provides a display module, the display module comprising a display panel and a voltage stabilizing module, the display panel comprising a first power supply interface, a second power supply interface and a plurality of light emitting circuits, each light emitting circuit comprising a pixel capacitor, a light emitting module and a first switch tube; the first power supply interface and an input end of the voltage stabilizing module being configured to be connected to a power supply chip, the first power supply interface being further configured to be connected to a first electrode of each first switch tube, the second power supply interface being connected to an output end of the voltage stabilizing module and a first end of each pixel capacitor, a second end of the pixel capacitor being connected to a control electrode of the first switch tube, and a second electrode of the first switch tube being connected to the light emitting module; the voltage stabilizing module being configured to output a first voltage to the first end of each pixel capacitor based on a power supply voltage provided by the power supply chip, the first voltage being stable in a target voltage range; and the first switch tube in each light emitting circuit being configured to output a target current to the light emitting module based on a second voltage provided by the second end of the pixel capacitor and the power supply voltage, so that the light emitting brightness of the light emitting module is a target brightness, the second voltage being obtained by the pixel capacitor after being charged based on the first voltage.

[0014] In a possible implementation, the display module further comprises a driving chip, the driving chip being configured to provide a data voltage to the display panel, and the voltage stabilizing module is arranged on the driving chip.

[0015] In a fourth aspect, the present application further provides an electronic device, the electronic device comprising a power supply chip and the display panel of the first aspect, or the electronic device comprising a power supply chip and the display module of the second aspect, the power supply chip being configured to provide a power supply voltage to the display module or the display panel.

[0016] The beneficial effects of the solutions provided by the above aspects can refer to the description of the first aspect, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A frame diagram of an electronic device provided by an embodiment of the present application;

[0018] Figure 2 Another frame diagram of an electronic device provided by an embodiment of the present application;

[0019] Figure 3 Still another frame diagram of an electronic device provided by an embodiment of the present application;

[0020] Figure 4 Still another frame diagram of an electronic device provided by an embodiment of the present application;

[0021] Figure 5 A structure diagram of a display panel provided by an embodiment of the present application;

[0022] Figure 6 A structure diagram of a pixel circuit provided by an embodiment of the present application;

[0023] Figure 7 A circuit structure diagram of a voltage stabilizing module provided by an embodiment of the present application;

[0024] Figure 8 Another structure diagram of a pixel circuit provided by an embodiment of the present application;

[0025] Figure 9 A control signal diagram provided by an embodiment of the present application;

[0026] Figure 10 Still another structure diagram of a pixel circuit provided by an embodiment of the present application;

[0027] Figure 11 Another control signal diagram provided by an embodiment of the present application;

[0028] Figure 12 Still another frame diagram of an electronic device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0029] The terms used in the embodiment part of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application.

[0030] The electronic device provided by the embodiments of the present application can include, but is not limited to, a television, a display, a mobile phone, a tablet computer, a notebook computer, a desktop computer, an all-in-one computer, an ultra-mobile personal computer (UMPC), a handheld computer, a touch television, a walkie-talkie, a netbook, a POS machine, a personal digital assistant (PDA), a wearable device (such as a watch, a bracelet, a smart watch, a smart bracelet, etc.), a virtual reality (VR) device and a mixed reality (MR) device (such as a VR glasses, an AR glasses, an AR helmet, a VR helmet, an MR helmet, etc.), a vehicle-mounted device, and the like.

[0031] The display module is used to realize the display of images, texts, and videos, and provide an interactive interface for a user, and can be an OLED display module, i.e., a display module using OLED as an organic light-emitting device. OLED has the characteristics of high brightness, low power consumption, fast response, good flexibility, and high luminous efficiency, and when applied to a display module, can realize high-brightness, high-resolution, and high-fluency image display, and meet the new demands of consumers for display technology. In other application scenarios, the display module can also be a micro organic light-emitting diode (MLOE) display module, an active-matrix organic light-emitting diode (AMOLED) display module, a light-emitting diode (LED) display module, a mini organic light-emitting diode (Mini LED) display module, a micro organic light-emitting diode (Micro LED) display module, a quantum dot light-emitting diode (QLED) display module, or a liquid crystal display (LCD) module, and the like, and the embodiments of the present application do not limit the same. For ease of description, the following content takes the display module as an OLED display module as an example for description.

[0032] In some possible embodiments, the electronic device can be a non-foldable electronic device. For example, the electronic device can be a straight bar phone, such as a straight bar horizontal screen phone or a straight bar vertical screen phone. The phone can include a middle frame with a flat shape, and a display module is arranged on the middle frame. The middle frame can support and assemble the display module. In this case, the display module can also have a flat structure, and neither the display module nor the middle frame can be folded.

[0033] Alternatively, the electronic device can also be a foldable electronic device. For example, the electronic device can be a foldable phone, such as a foldable horizontal screen phone or a foldable vertical screen phone. For example, the phone can include at least two middle frames that can rotate relative to each other to achieve folding or unfolding. A display module is arranged on the at least two middle frames. The display module can be a flexible screen that has flexibility and can be freely bent, wound, and folded, so that the display module can be folded or unfolded along with the folding or unfolding of the middle frames.

[0034] It can be understood that when the electronic device is a foldable phone, the foldable phone can be a foldable phone with the display module folded outward. Alternatively, the foldable phone can be a foldable phone with the display module folded inward. Alternatively, the foldable phone can be a foldable phone with part of the display module folded inward and part of the display module folded outward.

[0035] In some possible embodiments, the display module in the electronic device can include a display panel and a cover plate. The display panel is used to realize the display function of the display module. The cover plate can be a light-transmitting plate structure, such as a transparent glass plate. The cover plate is arranged on one side of the display panel and can protect the display panel. The size of the cover plate can be greater than or equal to the size of the display panel.

[0036] The display module can further include a polarizing sheet. The polarizing sheet can be arranged between the cover plate and the display panel. The polarizing sheet can selectively filter out light in certain directions and allow light in specific directions to pass through. The polarizing sheet can adjust the propagation direction of light, adjust the display brightness, contrast, and the like, and also reduce reflection and glare to improve visual clarity.

[0037] In some possible implementation manners, the electronic device provided by the embodiment of the present application can further include a mainboard, a power supply chip, a driving chip, and the like. The mainboard can receive signals from a computer or other input devices, and decode and process the signals, convert the signals into control signals required for controlling the display panel, and then transmit the control signals and data signals required for display to the driving chip. The driving chip can transmit the obtained data voltage to the display panel after gamma curve adjustment on the control signals and the data signals, so as to provide correct color and brightness information for each pixel circuit of the display panel. The power supply chip, as another key component of the electronic device, is mainly used for power conversion and power supply management. For example, the power supply chip can provide stable power supply voltage and common voltage for the display panel by converting direct current output by a power adapter into direct current required by the display panel. Specifically, the power supply voltage and the common voltage transmitted by the power supply chip can be transmitted to the display panel through wires in the electronic device. Meanwhile, the power supply chip can detect the power supply state, thereby ensuring power management and protection of the electronic device. Further, the display panel can include a plurality of pixel circuits, and each pixel circuit can display correct color and brightness based on the power supply voltage provided by the power supply chip and the data voltage provided by the driving chip.

[0038] Since the mainboard is usually arranged at a position far from the display panel, the transmission path of the power supply voltage is relatively long, and thus the power supply voltage received by the display panel can have a relatively obvious transmission voltage drop. Meanwhile, the power supply voltage can be interfered, thereby affecting the luminous brightness of the pixel circuit and causing the display panel to have water ripples, and reducing the display effect. Therefore, the electronic device provided by the embodiment of the present application is additionally provided with a voltage stabilizing module, which can stabilize the power supply voltage output by the power supply chip and then provide the power supply voltage to the display panel, so as to ensure that each pixel circuit of the display panel can receive the power supply voltage stabilized in a target voltage interval, that is, the power supply voltage with relatively small interference and transmission voltage drop, thereby reducing the water ripples of the display panel and improving the display effect.

[0039] For example, refer to Figure 1 , Figure 1 a frame diagram of the electronic device 100 provided by the embodiment of the present application. Figure 1The electronic device 100 shown includes a mainboard 102, a power supply chip 103, and a display module 101, which specifically includes a driving chip 1012, a voltage stabilizing module 1013, and a display panel 1011. The display panel 1011 can include a display area 1011a and a peripheral area 1011b, and the display area 1011a can be used to display images and the like. The peripheral area 1011b can surround the outside of the display area 1011a. For example, the display area 1011a can have a rectangular shape, and the peripheral area 1011b can have a square ring shape and surround the outside of the display area 1011a. The peripheral area 1011b can be a non-display area 1011a, i.e., the peripheral area 1011b can not be used to display images and the like. In some application scenarios, when the electronic device 100 is a foldable electronic device 100, the display panel 1011 can also have a folding area 1011c, and the folding area 1011c of the display panel 1011 and the folding area 1011c of the display module 101 in the electronic device 100 can substantially coincide in the thickness direction of the display module 101, and the extension direction of the folding area 1011c is consistent with the axis direction of the rotation shaft of the electronic device 100.

[0040] Figure 1 The power supply chip 103 shown can be disposed on the mainboard 102, and the driving chip 1012 and the voltage stabilizing module 1013 can be mounted on a circuit board, which can be a chip on film (COF) board used for screen display driving, i.e., a flexible circuit board. Alternatively, the driving chip 1012 described above can also be integrated on the mainboard 102. Figure 1 The voltage stabilizing module 1013 shown is separately externally mounted on a circuit board in the peripheral area 1011b of the display panel 1011.

[0041] It can be understood that, Figure 1 The electronic device 100 shown can provide the power supply voltage VDD output by the power supply chip 103 to the display panel 1011 after voltage stabilization by the voltage stabilizing module 1013. Specifically, the display panel 1011 directly obtains the power supply voltage VDD provided by the power supply chip 103 through a first power supply interface i1, and obtains a first voltage output by the voltage stabilizing module 1013 through a second power supply interface i2, which is the power supply voltage VDD after voltage stabilization. Therefore, each pixel circuit of the display panel 1011 can receive the power supply voltage VDD after voltage stabilization (i.e., the first voltage) through the second power supply interface i2. Further, the display panel 1011 also obtains a data voltage output by the driving chip 1012 through a third power supply interface i3. Each pixel circuit of the display panel 1011 can display the correct brightness and color according to the power supply voltage VDD input from the first power supply interface i1, the first voltage input from the second power supply interface i2, and the data voltage input from the third power supply interface i3, thereby reducing the water ripples of the display panel 1011 and improving the display effect.

[0042] In some possible implementation manners, the display module includes a bending part, which can be connected to the display panel and the circuit board respectively, and the bending part can be bent to the back of the display panel, so that the circuit board carrying the driving chip and the voltage stabilizing module is bent to the back of the display panel, thereby not occupying the front area space of the display panel. The display module is further connected to the main board through the flexible circuit board, and the main board can be arranged on the back of the display panel.

[0043] In some possible implementation manners, the electronic device provided by the embodiment of the present application can further include a battery, a charging management module, a communication module, a camera module (for example, a front camera and a rear camera), a microphone, a loudspeaker, a flash, and the like. Each of the devices can be fixed in the accommodation space of the electronic device, and the embodiment of the present application does not exemplify each of the devices here.

[0044] In some possible implementation manners, the newly added voltage stabilizing module in the display module can be arranged in the display module alone or integrated in the driving chip. In this case, the structure of the electronic device can refer to the electronic device 200 shown in FIG. 2. Figure 2 Figure 2 FIG. 3 is another schematic structural diagram of an electronic device provided by an embodiment of the present application. Figure 2 The electronic device 200 shown in FIG. 2 includes a main board 202, a power supply chip 203, and a display module 201. The display module 201 specifically includes a driving chip 2012, a voltage stabilizing module 2013, and a display panel 2011. The power supply chip 203 is arranged on the main board 202, and the voltage stabilizing module 2013 is arranged on the driving chip 2012. The driving chip 2012 can be carried on a circuit board (for example, the above-mentioned thin film chip on board).

[0045] It can be understood that, Figure 2 The power supply chip 203 shown in FIG. 2 can output a power supply voltage VDD to the first power supply interface i1 of the display panel 2011 and the driving chip 2012. The driving chip 2012 transmits the power supply voltage VDD to the voltage stabilizing module 2013 through a wire, and provides a first voltage output after voltage stabilization to the second power supply interface i2 of the display panel 2011. Therefore, each pixel circuit of the display panel 2011 can receive the power supply voltage VDD (that is, the first voltage) after voltage stabilization through the second power supply interface i2. The display panel 2011 further obtains a data voltage output by the driving chip 2012 based on a data signal through the third power supply interface i3. Each pixel circuit of the display panel 2011 can display correct brightness and color according to the power supply voltage VDD input from the first power supply interface i1, the first voltage input from the second power supply interface i2, and the data voltage input from the third power supply interface i3, thereby reducing water ripples of the display panel and improving the display effect.

[0046] ​It should be noted that Figure 2 The implementation of the display panel 2011, the mainboard 202, the power supply chip 203, or the driving chip 2012 in the electronic device 200 shown can be referred to Figure 1 The specific implementation of the electronic device 100 shown will not be repeated here.

[0047] In some possible implementations, the newly added voltage stabilizing module in the display module can also be integrated in the display panel. At this time, the structure of the electronic device can also be referred to Figure 3 Figure 3 Another schematic diagram of the electronic device provided by the embodiments of the present application is shown. Figure 3 The electronic device 300 shown includes a mainboard 302, a power supply chip 303, and a display module 301. The display module 301 specifically includes a driving chip 3012, a voltage stabilizing module 3013, and a display panel 3011. The power supply chip 303 is arranged on the mainboard 302, the voltage stabilizing module 3013 is arranged on the display panel 3011, and the driving chip 3012 can be carried on a circuit board (for example, the above-mentioned thin film chip on film board).

[0048] It can be understood that Figure 3 The power supply chip 303 shown can output a power supply voltage VDD to a first power supply interface i1 and a second power supply interface i2 of the display panel 3011. The first power supply interface i1 transmits the power supply voltage VDD to each pixel circuit through a wire, and the second power supply interface i2 transmits the power supply voltage VDD to the voltage stabilizing module 3013 through a wire and provides a first voltage output after voltage stabilization to each pixel circuit of the display panel 3011. Therefore, each pixel circuit of the display panel 3011 receives the power supply voltage VDD (i.e., the first voltage) after voltage stabilization. The display panel 3011 also obtains a data voltage output by the driving chip 3012 based on a data signal through a third power supply interface i3. Each pixel circuit of the display panel 3011 can display correct brightness and color according to the power supply voltage VDD input from the first power supply interface i1, the first voltage input from the second power supply interface i2, and the data voltage input from the third power supply interface i3, thereby reducing the water ripples of the display panel 3011 and improving the display effect.

[0049] It should be noted that Figure 3 The implementation of the display panel 3011, the mainboard 302, the power supply chip 303, or the driving chip 3012 in the electronic device 300 shown can be referred to Figure 1 The specific implementation of the electronic device 100 shown will not be repeated here.

[0050] In some possible implementations, when the voltage stabilizing module is integrated in the display panel, the structure of the electronic device can also be referred to​Figure 4 As shown, Figure 4 This is yet another schematic diagram of the electronic device provided in an embodiment of this application. Figure 3 The electronic device 300 shown is different, Figure 4 In the illustrated electronic device 400, the display panel 4011 obtains the power supply voltage VDD provided by the power chip 403 only through the first power interface i1, thus reducing the... Figure 3 The second power interface i2 is shown. At this time, after the display panel 4011 obtains the power voltage VDD provided by the power chip 403 through the first power interface i1, it can supply the power voltage VDD to the voltage regulator module 4013 and each pixel circuit respectively through wires. The voltage regulator module 4013 provides the first voltage, after voltage regulation, to each pixel circuit of the display panel 4011, so that each pixel circuit can receive the first voltage after voltage regulation, thereby reducing the water ripples appearing on the display panel 4011 and improving the display effect.

[0051] It should be noted that, Figure 4 For details on the implementation of components such as the display panel 4011, motherboard 402, power chip 403, or driver chip 4012 in the electronic device 400 shown, please refer to [reference needed]. Figure 1 The specific implementation of the electronic device 100 shown will not be described in detail here.

[0052] For some feasible implementations, please refer to Figure 5 , Figure 5 This is a schematic diagram of the structure of a display panel provided in an embodiment of this application. In some application scenarios, Figure 5 The display panel shown can be understood as Figures 1 to 4 The display panel in the electronic device shown.

[0053] like Figure 5 As shown, the display panel 500 includes a substrate 510 and a plurality of light-emitting circuit groups. The substrate 510 serves as a support structure for the display panel 500. The substrate 510 includes a first surface and a second surface facing away from each other. The plurality of light-emitting circuit groups can be disposed on the first surface. Specifically, the plurality of light-emitting circuit groups can be disposed on the first surface along a second direction (…). Figure 5 The pixels are arranged sequentially in the y-direction shown. For example, the multiple light-emitting circuit groups include a first light-emitting circuit group 12, a second light-emitting circuit group 13, ..., an nth light-emitting circuit group 1n, and the n pixel groups are arranged sequentially in the second direction.

[0054] In some feasible embodiments, the first surface side of the substrate 510 can be as described above. Figure 5 The area is divided into a display area 510a and a peripheral area 510b. At this time, multiple light-emitting circuit groups can be arranged in the display area 510a on the first surface of the substrate.

[0055] Each light emitting circuit group can include a plurality of light emitting circuits 11, which can generate primary color light as light emitting units of the display panel 500. For example, the plurality of light emitting circuits 11 can generate red, green and blue three primary color lights respectively, i.e., form a three primary color light model (RGB model), so as to realize color display. The plurality of light emitting circuits 11 in each light emitting circuit group can be arranged in a row along a first direction (e.g., the x direction shown in FIG. 1) in sequence, and the distribution positions of the plurality of light emitting circuits 11 in any two light emitting circuit groups can correspond to each other in a second direction, so that the plurality of light emitting circuits 11 can form an array arranged in a vertical and horizontal manner along the second direction and the first direction. The first direction can be perpendicular to the second direction, for example, the first direction can be consistent with the width direction of the display panel 500 (e.g., the x direction in FIG. 1), and the second direction can be consistent with the length direction of the display panel 500 (e.g., the y direction in FIG. 1). In other application scenarios, the first direction can be consistent with the length direction of the display panel 500, and the second direction can be consistent with the width direction of the display panel 500, which can be adjusted according to actual design requirements of the display panel 500. Figure 5 Figure 5 Figure 5

[0056] It should be noted that in order to realize light emitting display, each light emitting circuit 11 includes a driving circuit and a light emitting module. The plurality of light emitting modules of the plurality of light emitting circuits 11 can include a plurality of red light emitting modules, a plurality of green light emitting modules and a plurality of blue light emitting modules, which can emit red light, green light and blue light respectively. The driving circuit in each light emitting circuit 11 is electrically connected with the light emitting module to drive the light emitting module to emit light or be extinguished, so as to realize image display of the display panel 500. The driving circuit can include one or more thin film transistors (TFTs), and the driving TFT is turned on and turned off to realize driving control of the light emitting module to emit light or be extinguished. For example, the light emitting module can be an OLED.

[0057] In some possible implementation manners, in order to facilitate understanding of the driving control principle of each light emitting circuit and the role of the voltage stabilizing module, the following content is combined with Figures 6 to 11 to introduce a pixel circuit composed of one light emitting circuit and a voltage stabilizing module in detail. Please refer to Figure 6 , Figure 6 a structure schematic diagram of the pixel circuit provided by the embodiments of the present application. In the pixel circuit, Figure 6 the pixel capacitor C1, the first switch tube T1 and the light emitting module D1 shown in the pixel circuit can be understood as the light emitting circuit 11 and the voltage stabilizing module 10 described above. Figure 5 ​​​The light-emitting circuit 11 shown, the pixel capacitor C1 and the first switch tube T1 are used for driving control light-emitting module D1 to emit light or extinguish, which can be understood as the driving circuit in the light-emitting circuit 11.

[0058] Figure 6 The first electrode of the first switch tube T1 can be electrically connected with the power supply chip 620 to receive the power supply voltage VDD output by the power supply chip 620. The first electrode of the first switch tube T1 can not be directly connected with the power supply chip 620, that is, other electronic devices can also be arranged between the first electrode of the first switch tube T1 and the power supply chip 620. The second electrode of the first switch tube T1 can be electrically connected with the anode of the light-emitting module D1 to output current to the light-emitting module D1. The second electrode of the first switch tube T1 can not be directly connected with the light-emitting module D1, that is, other electronic devices can also be arranged between the second electrode of the first switch tube T1 and the light-emitting module D1. The cathode of the light-emitting module D1 is connected with the common terminal of the pixel circuit 610. When the first switch tube T1 is turned on, the first switch tube T1 can output current based on the power supply voltage VDD output by the power supply chip 620, the current flows from the first electrode to the second electrode of the first switch tube T1, and flows to the light-emitting module D1. Among them, the luminance of the light-emitting module D1 is proportional to the size of the current flowing through the light-emitting module D1, that is, the greater the current output by the first switch tube T1, the greater the luminance of the light-emitting module D1.

[0059] It should be noted that the size of the current output by the first switch tube T1 is proportional to the size of the conduction degree of the first switch tube T1. That is, the greater the conduction degree of the first switch tube T1, that is, the smaller the equivalent impedance of the first switch tube T1, the greater the current output by the first switch tube T1 based on the power supply voltage VDD. At the same time, in the linear region of the first switch tube T1, the conduction degree of the first switch tube T1 is proportional to the size of the voltage of the control electrode of the first switch tube T1. That is, in the linear region of the first switch tube T1, the greater the voltage of the control electrode of the first switch tube T1, the greater the conduction degree of the first switch tube T1, and the smaller the equivalent impedance. As can be seen, the pixel circuit 610 can provide different voltages to the control electrode of the first switch tube T1 to adjust the conduction degree of the first switch tube T1, and adjust the size of the current output by the first switch tube T1, and then adjust the luminance of the light-emitting module D1. In the embodiment of the present application, the pixel circuit 610 can provide a second voltage to the control electrode of the first switch tube T1 through the pixel capacitor C1 to adjust the conduction degree of the first switch tube T1.

[0060] As Figure 6As shown, the control electrode of the first switch transistor T1 is connected with the second end of the pixel capacitor C1, and the pixel circuit 610 can charge the pixel capacitor C1 in the charging phase of the pixel capacitor C1 to establish the second voltage at the second end of the pixel capacitor C1. After the pixel capacitor C1 is charged, the pixel circuit 610 can provide the second voltage at the second end of the pixel capacitor C1 to the control electrode of the first switch transistor T1 in the discharging phase of the pixel capacitor C1, and the voltage of the second voltage is proportional to the conduction degree of the first switch transistor T1, and the conduction degree of the first switch transistor T1 is related to the target brightness of the light emitting module D1. The charging phase of the pixel capacitor C1 can be understood as the phase in which the light emitting module D1 does not emit light, and the discharging phase of the pixel capacitor C1 can be understood as the phase in which the light emitting module D1 emits light. The first switch transistor T1 can output the target current based on the second voltage and the power supply voltage, so that the light emitting module D1 emits light with the target brightness. When the pixel circuit 610 charges the pixel capacitor C1 with different data voltages to adjust the voltage of the second voltage provided by the second end of the pixel capacitor C1, the light emitting module D1 can emit light with different brightness. The voltage of the data voltage can represent the size of the target brightness of the light emitting module D1. When the target brightness of the light emitting module D1 is larger, the data voltage provided by the pixel circuit 610 to the pixel capacitor C1 is larger, and the second voltage at the second end of the pixel capacitor C1 after charging is larger, so that the conduction degree of the first switch transistor T1 is larger. When the target brightness of the light emitting module D1 is smaller, the data voltage provided by the pixel circuit 610 to the pixel capacitor C1 is smaller, and the second voltage at the second end of the pixel capacitor C1 after charging is smaller, so that the conduction degree of the first switch transistor T1 is larger.

[0061] In some possible embodiments, in the charging phase of the pixel capacitor C1, the first end of the pixel circuit 610 directly obtains the power supply voltage VDD provided by the power supply chip 620, and the second end obtains the data voltage provided by the pixel circuit 610, and the pixel capacitor C1 can be charged under the action of the power supply voltage VDD and the data voltage. In the discharging phase of the pixel capacitor C1, the pixel capacitor C1 provides the second voltage to the first switch transistor T1 to make the light emitting module D1 emit light. It can be known from the above that, since the power supply chip 620 is usually arranged on the mainboard far away from the display panel, the transmission path of the power supply voltage VDD is relatively long, and the power supply voltage VDD can be interfered. Therefore, the power supply voltage VDD directly received by the first end of the pixel capacitor C1 has relatively obvious transmission voltage drop and interference. When the pixel capacitor C1 is charged based on the power supply voltage VDD and the data voltage, the second voltage at the second end of the pixel capacitor C1 after charging will also have deviation due to the deviation of the power supply voltage VDD, and then the luminance of the light emitting module D1 will be affected, so that the display panel has water ripples and the display effect is reduced.

[0062] Therefore, the pixel circuit 610 can regulate the power supply voltage VDD output by the power chip 620 through the voltage regulator module 612 before supplying it to the first terminal of the pixel capacitor C1, so as to ensure that the first terminal of the pixel capacitor C1 can receive the power supply voltage VDD with less interference and transmission voltage drop.

[0063] For example, such as Figure 6 As shown, the first terminal of pixel capacitor C1 is connected to the output terminal of voltage regulator module 612, and the input terminal of voltage regulator module 612 is connected to power chip 620. Voltage regulator module 612 obtains the power supply voltage VDD output by power chip 620 through its input terminal, and after regulating the power supply voltage VDD, provides a first voltage stable within the target voltage range to the first terminal of pixel capacitor C1. The target voltage range can be understood as the voltage range that the voltage at the first terminal of pixel capacitor C1 needs to satisfy when pixel circuit 610 drives light-emitting module D1 to emit light at the target brightness. In other words, if the voltage at the first terminal of pixel capacitor C1 exceeds the target voltage range, the second voltage at the second terminal of pixel capacitor C1 after charging will have a significant deviation. This causes the first switching transistor T1 to output current based on this second voltage and the power supply voltage VDD to drive light-emitting module D1 to emit light, resulting in a difference in the brightness of light-emitting module D1, causing water ripples to appear on the display panel. Pixel circuit 610 can obtain this target voltage range based on the power supply voltage VDD output by power chip 620, which does not generate interference or transmission voltage drop. For example, assuming the first power supply voltage is greater than the aforementioned power supply voltage VDD without interference and transmission voltage drop, and the second power supply voltage is less than the aforementioned power supply voltage VDD without interference and transmission voltage drop, after the voltage regulator module 612 provides the first power supply voltage or the second power supply voltage to the first terminal of the pixel capacitor C1, if the pixel circuit 610 drives the light-emitting module D1, and the light-emitting module D1 can emit light at the target brightness, and the water ripples on the display panel are significantly reduced, then the pixel circuit 610 can use the values ​​of the first power supply voltage and the second power supply voltage as the aforementioned target voltage range. Conversely, if the brightness of the light-emitting module D1 is inaccurate, or if water ripples exist on the display panel, the magnitudes of the first power supply voltage and the second power supply voltage can be further adjusted.

[0064] In summary, the first terminal of pixel capacitor C1 receives the first voltage output from the voltage regulator module 612, which keeps the voltage at the first terminal stable within the target voltage range. Simultaneously, the second terminal of pixel capacitor C1 is connected to the control electrode of the first switch transistor T1. During the charging phase of pixel capacitor C1, the pixel circuit 610 can transmit a data voltage to the second terminal of pixel capacitor C1, allowing pixel capacitor C1 to charge based on the first voltage at the first terminal and the data voltage at the second terminal. The stability of the first voltage at the first terminal of pixel capacitor C1 within the target voltage range ensures that the second voltage at the second terminal of pixel capacitor C1 remains consistent after charging. Furthermore, the first switch transistor T1 outputs a target current based on this second voltage and the power supply voltage VDD, driving the light-emitting module D1 to emit light at the target brightness. This ensures accurate brightness of the light-emitting module D1, effectively reduces water ripples, and improves the display effect.

[0065] It should be noted that when Figure 6 When the pixel circuit 610 shown is applied in an electronic device, the voltage regulator module 612 can be integrated together with the pixel capacitor C1, the first switching transistor T1, and the light-emitting module D1 on the display panel of the electronic device. Alternatively, the voltage regulator module 612 can be separately externally mounted in the display module. Alternatively, the voltage regulator module 612 can also be integrated on the driver chip; see the above for details. Figures 1 to 5 The voltage regulator module 612 shown in this embodiment will not be described in detail here.

[0066] In some feasible implementations, to facilitate understanding of the implementation principle of the voltage regulator module, the following content combines... Figure 7 To illustrate, Figure 7 This is a schematic diagram of a circuit structure for a voltage regulator module provided in an embodiment of this application. Figure 7 As shown, the voltage regulator module 70 may include a switching unit Q1, an operational amplifier AMP, a voltage source RV, a first resistor R1, and a second resistor R2. The switching unit Q1 is connected in series between the input and output terminals of the voltage regulator module 70. The control electrode of the switching unit Q1 is connected to the output terminal of the operational amplifier AMP. The first resistor R1 and the second resistor R2 are connected in series between the output terminal of the voltage regulator module 70 and ground. The positive input terminal of the operational amplifier AMP is connected to the junction of the first resistor R1 and the second resistor R2, and the negative input terminal of the operational amplifier AMP is connected to the positive terminal of the voltage source RV. The negative terminal of the voltage source RV is connected to ground.

[0067] It should be noted that when the power supply voltage received by the input end of the voltage stabilizing module 70 varies due to interference or transmission voltage drop, the voltage of the output end of the voltage stabilizing module 70 also varies, and the current flowing through the first resistor R1 and the second resistor R2 also varies. At this time, the operational amplifier AMP can compare the voltage of the feedback voltage from the positive input end with the voltage of the reference voltage from the negative input end. At the same time, since the switching unit Q1 is in the linear region, the operational amplifier AMP can make the switching unit be in different conduction degrees by adjusting the voltage of the output end, and then can adjust the voltage of the output end of the voltage stabilizing module 70 in real time based on the difference between the feedback voltage and the reference voltage until the real-time difference between the feedback voltage and the reference voltage is zero, so as to keep the voltage of the output end of the voltage stabilizing module 70 stable.

[0068] It can be understood that the voltage stabilizing module 70 can also realize voltage stabilization (voltage stabilization) through other types of feedback loop control, Figure 7 The voltage stabilizing module 70 shown is only an example and does not constitute a limitation on the embodiments of the present application.

[0069] In some possible embodiments, the specific structure of the pixel circuit in the embodiments of the present application can refer to Figure 8 shown, Figure 8 Another structure diagram of the pixel circuit provided by the embodiments of the present application is shown. Figure 8 The pixel circuit 810 shown includes a voltage stabilizing module 812, a pixel capacitor C1, a first switching tube T1, a second switching tube T2, a third switching tube T3, a fourth switching tube T4, a fifth switching tube T5, and a light-emitting module D1. The first electrode of the second switching tube T2 is connected to the first electrode of the first switching tube T1, the third switching tube T3 is connected between the input end of the voltage stabilizing module 812 and the first electrode of the first switching tube T1, the fourth switching tube T4 is connected between the light-emitting module D1 and the second electrode of the first switching tube T1, and the fifth switching tube T5 is connected between the second end of the pixel capacitor C1 and the second electrode of the first switching tube. Among them, Figure 8 The specific implementation of the voltage stabilizing module 812, the first switching tube T1, and the light-emitting module D1 shown can refer to the specific implementation of the above Figure 6 embodiments, which will not be repeated here.

[0070] In some possible embodiments, Figure 8The first switch tube T1, the second switch tube T2, the third switch tube T3 and the fourth switch tube T4 shown are P-channel metal oxide semiconductor (PMOS), and the fifth switch tube T5 is N-channel metal oxide semiconductor (NMOS).

[0071] It can be understood that the first switch tube T1, the second switch tube T2, the third switch tube T3 and the fourth switch tube T4 are PMOS tubes, and the first switch tube T1, the second switch tube T2, the third switch tube T3 and the fourth switch tube T4 are turned on when the control electrode is low, and are turned off when the control electrode is high. The fifth switch tube T5 is NMOS, and the fifth switch tube T5 is turned off when the control electrode is low, and is turned on when the control electrode is high.

[0072] At this time, the pixel circuit 810 sends the control signal to the control electrode of each switch tube (the second switch tube T2, the third switch tube T3, the fourth switch tube T4 and the fifth switch tube T5) through Figure 9 The control signal shown is sent to the control electrode of each switch tube (the second switch tube T2, the third switch tube T3, the fourth switch tube T4 and the fifth switch tube T5) to control the conduction or turn-off of each switch tube, to control the charging or discharging of the pixel capacitor C1, and further drive the light-emitting module D1 to emit light or extinguish. Figure 9 A control signal diagram provided by the embodiment of the application.

[0073] Specifically, please refer to Figure 8 and Figure 9 , Figure 8 and Figure 9 The em signal shown is the control signal of the third switch tube T3 and the fourth switch tube T4, Figure 8 and Figure 9 The sp signal shown is the control signal of the second switch tube T2, Figure 8 The data signal shown is the above-mentioned data voltage, that is, the voltage of the data signal is used to represent the size of the target brightness of the light-emitting module D1, Figure 8 and Figure 9 The sn signal shown is the control signal of the fifth switch tube T5.

[0074] As Figure 9As shown, at the time of a, the control signals of the third switch tube T3 and the fourth switch tube T4, i.e. the em signal, are switched from low level to high level, and the third switch tube T3 and the fourth switch tube T4 are switched from the on state to the off state. At the same time, the control signal of the fifth switch tube T5, i.e. the sn signal, is low level, and the fifth switch tube T5 is in the off state. The control signal of the second switch tube T2, i.e. the sp signal, is high level, and the second switch tube T2 is also in the off state. At this time, the first electrode of the first switch tube T1 is disconnected from the power supply chip 820, the second switch tube T2 and the light emitting module D1, and thus the first electrode of the first switch tube T1 cannot receive the data signal or the power supply voltage VDD, nor can it output current to the light emitting module D1.

[0075] At the time of b, the control signal of the fifth switch tube T5, i.e. the sn signal, is switched from low level to high level, and the fifth switch tube T5 is switched from the off state to the on state. At this time, the fifth switch tube T5 connects the second end of the pixel capacitor C1 to the second electrode of the first switch tube T1, and the voltage of the second electrode of the first switch tube T1 rises due to the first voltage provided by the voltage stabilizing module 812 obtained by the first end of the pixel capacitor C1.

[0076] At the time of c, the sp signal is switched from high level to low level, and the second switch tube T2 is switched from the off state to the on state. At this time, the second switch tube T2 connects the second electrode of the second switch tube T2 to the first electrode of the first switch tube T1, and the second electrode of the second switch tube T2 can transmit the received data signal to the first electrode of the first switch tube T1, so that the voltage of the first electrode of the first switch tube T1 rises. Further, since the voltages of the first electrode and the second electrode of the first switch tube T1 both rise, a conduction voltage difference can be formed between the control electrode and the second electrode of the first switch tube T1, so that the first switch tube T1 can be switched to the on state. At this time, the first switch tube T1, the second switch tube T2 and the fifth switch tube T5 are all on, so that the data signal can be transmitted to the second end of the pixel capacitor C1, and the pixel capacitor C1 can be charged based on the first voltage provided by the voltage stabilizing module 812 and the data signal, i.e. the data voltage. As can be seen, the arrival of time c means the arrival of the charging phase of the pixel capacitor C1.

[0077] At the time of d, the sp signal is switched from low level to high level, and the second switch tube T2 is switched from the on state to the off state, and the pixel capacitor C1 no longer charges the data signal, i.e. the charging of the pixel capacitor C1 is completed. As can be seen, the arrival of time d means the end of the charging phase of the pixel capacitor C1.

[0078] At the e moment, the sn signal is switched from high level to low level, the fifth switch tube T5 is switched from the on state to the off state, and the second end of the pixel capacitor C1 is disconnected from the second electrode of the first switch tube T1. At this time, the second end of the pixel capacitor C1 can provide the second voltage to the control electrode of the first switch tube T1, so that the first switch tube T1 is turned on. The em signal is still high level, and the third switch tube T3 and the fourth switch tube T4 are in the off state, so the first switch tube T1 does not output the target current.

[0079] At the f moment, the em signal is switched from high level to low level, the third switch tube T3 and the fourth switch tube T4 are switched from the off state to the on state, the first electrode of the first switch tube T1 receives the power supply voltage VDD, and the second electrode of the first switch tube T1 is connected with the light emitting module D1. The first switch tube T1 can output the target current to the light emitting module D1 based on the power supply voltage VDD and the second voltage provided by the second end of the pixel capacitor C1, so as to drive the light emitting module D1 to emit light at the target brightness. It can be seen that the arrival of the f moment means the start of the discharge phase of the pixel capacitor C1.

[0080] It can be understood that, Figure 8 The circuit structure of the pixel circuit 810 shown can be implemented by Figure 9 The control signal shown can be implemented, and in other application scenarios, the circuit structure of the pixel circuit 810 can be flexibly deformed, and the specific implementation of the control signal can also be adjusted according to the deformation of the pixel circuit 810. The above is only an example and does not constitute a limitation on the embodiments of the present application.

[0081] In some possible implementations, when displaying a dynamic picture, in order to reduce the dynamic blur phenomenon, the display panel can increase the refresh rate of the image. Or, when displaying a static picture, in order to reduce the power consumption of the device, the image refresh rate can be reduced. In the process of dynamically switching the image refresh rate, the display image will appear color deviation phenomenon, thereby affecting the display effect. In order to improve the problem of color deviation when the display terminal dynamically switches the image refresh rate, the pixel circuit provided by the embodiments of the present application can adopt the circuit structure shown in Figure 10 Figure 10 Another structure diagram of the pixel circuit provided by the embodiments of the present application.

[0082] Figure 10 ​The pixel circuit 1010 shown includes a voltage stabilizing module 1012, a pixel capacitor C1, a first switch tube T1, a second switch tube T2, a third switch tube T3, a fourth switch tube T4, a fifth switch tube T5, a sixth switch tube T6, a seventh switch tube T7, an eighth switch tube T8, and a light-emitting module D1. The first electrode of the second switch tube T2 is connected to the first electrode of the first switch tube T1, the third switch tube T3 is connected between the input end of the voltage stabilizing module 1012 and the first electrode of the first switch tube T1, the fourth switch tube T4 is connected between the light-emitting module D1 and the second electrode of the first switch tube T1, and the fifth switch tube T5 is connected between the second end of the pixel capacitor C1 and the second electrode of the first switch. In addition, the second electrode of the first switch tube T1 is also connected to the first electrode of the sixth switch tube T6 and the first electrode of the seventh switch tube T7, the first electrode of the eighth switch tube T8 is connected to the anode of the light-emitting module D1, and the cathode of the light-emitting module D1 is grounded. Figure 10 The specific implementation of the voltage stabilizing module 1012, the first switch tube T1, and the light-emitting module D1 shown can refer to the specific implementation of the voltage stabilizing module 1012, the first switch tube T1, and the light-emitting module D1 in the above Figure 6 and Figure 8 The specific implementation of the voltage stabilizing module 1012, the first switch tube T1, and the light-emitting module D1 shown can refer to the specific implementation of the voltage stabilizing module 1012, the first switch tube T1, and the light-emitting module D1 in the above

[0083] In some possible implementations, Figure 10 The first switch tube T1, the second switch tube T2, the third switch tube T3, the fourth switch tube T4, the sixth switch tube T6, the seventh switch tube T7, and the eighth switch tube T8 shown are PMOS tubes, and the first switch tube T1, the second switch tube T2, the third switch tube T3, and the fourth switch tube T4 are turned on when the control electrodes thereof are at a low level and are turned off when the control electrodes thereof are at a high level. The fifth switch tube T5 is an NMOS tube, and the fifth switch tube T5 is turned off when the control electrode thereof is at a low level and is turned on when the control electrode thereof is at a high level.

[0084] At this time, the pixel circuit 1010 sends control signals to the control electrodes of the above-mentioned switch tubes (the second switch tube T2, the third switch tube T3, the fourth switch tube T4, the fifth switch tube T5, the sixth switch tube T6, the seventh switch tube T7, and the eighth switch tube T8) through the Figure 11 control signals shown to control the switch tubes to be turned on or turned off, so as to control the pixel capacitor C1 to be charged or discharged, and further drive the light-emitting module D1 to emit light or be extinguished. Figure 11 Another control signal diagram provided by the embodiment of the present application is shown.

[0085] Specifically, please refer to the em signals shown in Figure 10 and Figure 11 , Figure 10 and Figure 11 The em signals shown are the control signals of the third switch tube T3 and the fourth switch tube T4, Figure 10 andFigure 11 The sp1 signal is a control signal of the second switch T2, Figure 10 The data signal is the above-mentioned data voltage, that is, the voltage of the data signal is used to represent the target brightness of the light-emitting module D1, Figure 10 And Figure 11 The sp2 signal is a control signal of the seventh switch T7 and the eighth switch T8, Figure 10 And Figure 11 The sn1 signal is a control signal of the sixth switch T6, Figure 10 And Figure 11 The sn2 signal is a control signal of the fifth switch T5,

[0086] As Figure 11 As shown, at time a, the control signals of the third switch T3 and the fourth switch T4, that is, the em signal, are switched from low to high, and the third switch T3 and the fourth switch T4 are switched from the on state to the off state. At the same time, the sn2 signal is low, the fifth switch T5 is in the off state, the sp1 signal is high, and the second switch T2 is also in the off state. At this time, the first electrode of the first switch T1 is disconnected from the power chip 1020, the second switch T2 and the light-emitting module D1, so that the first electrode of the first switch T1 cannot receive the data signal or the power voltage VDD, and also cannot output current to the light-emitting module D1. In addition, the sn1 signal and the sp2 signal are high, and the sixth switch T6, the seventh switch T7 and the eighth switch T8 are all in the off state.

[0087] At time b, the control signal of the fifth switch T5, that is, the sn2 signal, is switched from low to high, and the fifth switch T5 is switched from the off state to the on state. At this time, the fifth switch T5 connects the second end of the pixel capacitor C1 to the second electrode of the first switch T1, and the first end of the pixel capacitor C1 obtains the first voltage provided by the voltage stabilizing module 1012, so that the voltage of the second electrode of the first switch T1 rises.

[0088] At time c, the sn1 signal is switched from low to high, and the sixth switch T6 is switched from the off state to the on state, and the sixth switch T6 is connected to the second end of the pixel capacitor C1 through the on fifth switch T5. At the same time, the second electrode of the sixth switch T6 receives the third voltage v3, and after the sixth switch T6 is turned on, the second end of the pixel capacitor C1 and the second electrode of the sixth switch T6 form a voltage loop, which can discharge the residual charge of the second voltage of the pixel capacitor C1, and further reset the voltage of the second end of the pixel capacitor C1. Further, after completing the voltage reset, the sn1 signal can be switched to high to control the sixth switch T6 to be off.

[0089] At the arrival of the d moment, the sp1 signal is switched from high level to low level, and the second switch tube T2 is switched from the off state to the on state. At this time, the second electrode of the second switch tube T2 is connected to the first electrode of the first switch tube T1, and the second electrode of the second switch tube T2 can transmit the received data signal to the first electrode of the first switch tube T1, so that the voltage of the first electrode of the first switch tube T1 rises. Further, since the voltages of the first electrode and the second electrode of the first switch tube T1 rise, a conduction voltage difference can be formed between the control electrode and the second electrode of the first switch tube T1, so that the first switch tube T1 can be switched to the on state. At this time, the first switch tube T1, the second switch tube T2 and the fifth switch tube T5 are all on, so that the data signal can be transmitted to the second end of the pixel capacitor C1, so that the pixel capacitor C1 can be charged based on the first voltage provided by the voltage stabilizing module 1012 and the data signal, that is, the data voltage. As can be seen, the arrival of the d moment means the arrival of the charging phase of the pixel capacitor C1.

[0090] At the arrival of the e moment, the sp1 signal is switched from low level to high level, the second switch tube T2 is switched from the on state to the off state, and the pixel capacitor C1 no longer obtains the data signal for charging, that is, the pixel capacitor C1 charging is completed. As can be seen, the arrival of the e moment means the end of the charging phase of the pixel capacitor C1.

[0091] At the arrival of the f moment, the sn2 signal is switched from high level to low level, and the fifth switch tube T5 is switched from the on state to the off state, and the second end of the pixel capacitor C1 is disconnected from the second electrode of the first switch tube T1. At this time, the second end of the pixel capacitor C1 can provide the second voltage to the control electrode of the first switch tube T1, so that the first switch tube T1 is on. The em signal is still high level, the third switch tube T3 and the fourth switch tube T4 are in the off state, so the first switch tube T1 does not output the target current.

[0092] At the coming of the g moment, the sp2 signal is switched from high level to low level, and the seventh switch tube T7 and the eighth switch tube T8 are switched from the off state to the on state. At the same time, the second electrode of the seventh switch tube T7 receives the fourth voltage v4, and after the seventh switch tube T7 is turned on, the first electrode of the fourth switch tube T4 connected with the first switch tube T1 forms a voltage loop with the second electrode of the seventh switch tube T7, so as to release the residual charge on the first electrode of the fourth switch tube T4, and then realize the voltage reset of the first electrode of the fourth switch tube T4. At the same time, the second electrode of the eighth switch tube T8 receives the fifth voltage v5, and after the eighth switch tube T8 is turned on, the anode of the light emitting module D1 forms a voltage loop with the second electrode of the eighth switch tube T8, so as to release the residual charge on the anode of the light emitting module D1, and then realize the voltage reset of the anode of the light emitting module D1. Further, after the voltage reset is completed, the sp2 signal can be switched to high level to control the seventh switch tube T7 and the eighth switch tube T8 to be off.

[0093] At the coming of the h moment, the em signal is switched from high level to low level, the third switch tube T3 and the fourth switch tube T4 are switched from the off state to the on state, the first electrode of the first switch tube T1 receives the power supply voltage VDD, and the second electrode of the first switch tube T1 is connected with the light emitting module D1 in conduction. Then, the first switch tube T1 can output a target current to the light emitting module D1 based on the power supply voltage VDD and the second voltage provided by the second end of the pixel capacitor C1, so as to drive the light emitting module D1 to emit light at a target brightness. It can be seen that the coming of the h moment means that the discharge phase of the pixel capacitor C1 starts.

[0094] It can be understood that, Figure 10 The circuit structure of the pixel circuit 1010 shown in the figure can be realized by Figure 11 The control signals shown in the figure are realized, and in other application scenarios, the circuit structure of the pixel circuit 1010 can be flexibly deformed, and the specific realization of the control signal can also be adjusted according to the deformation of the pixel circuit 1010. The above is only an example and does not constitute a limitation on the embodiments of the present application.

[0095] In some possible implementations, when the pixel circuit provided by the embodiments of the present application is applied in an electronic device, the voltage stabilizing module in the pixel circuit can be integrated on the display panel of the electronic device together with the pixel capacitor C1, the first switch tube T1 and the light emitting module D1. Alternatively, the voltage stabilizing module can be separately externally hung in the display module. Alternatively, the voltage stabilizing module can also be integrated on a driving chip. For details, please refer to the voltage stabilizing module shown in the above Figures 1 to 5 The embodiments of the present application will not be described here. For the sake of understanding, the embodiments of the present application will be illustrated by taking Figure 12 as an example, Figure 12 Another framework schematic diagram of an electronic device provided by the embodiments of the present application is shown in the figure.

[0096] like Figure 12 As shown, the display panel 1210 includes multiple light-emitting circuits, and each light-emitting circuit includes a pixel capacitor C1, a light-emitting module D1, and a first switching transistor T1. A voltage regulator module 1240 is mounted on the driver chip 1230, and a power supply chip 1250 is mounted on the main board 1220. The power supply chip 1250 can be connected to each light-emitting circuit via the first power interface i1 of the display panel 1210 to provide a power supply voltage VDD to each light-emitting circuit. The driver chip 1230 also provides a data voltage to each light-emitting circuit via the third power interface i3 of the display panel 1210. The voltage regulator module 1240 can be connected to the first terminal of the pixel capacitor C1 in each light-emitting circuit via the second power interface i2 of the display panel 1210, providing a stable first voltage within the target voltage range to the first terminal of each pixel capacitor C1. This ensures that the light-emitting module D1 of each light-emitting circuit emits light at the correct target brightness, reducing the generation of water ripples on the display panel 1210, improving the display effect, and enhancing applicability. It is understandable that... Figure 12 For a detailed implementation of the electronic device 1200 shown above, please refer to the above. Figures 1 to 11 The specific implementation details are not elaborated here.

Claims

1. A pixel circuit, characterized by comprising: The pixel circuit comprises a voltage stabilizing module, a light-emitting module, a pixel capacitor and a first switch tube, an input end of the voltage stabilizing module and a first electrode of the first switch tube are used for connecting a power supply chip, an output end of the voltage stabilizing module is connected to a first end of the pixel capacitor, a second end of the pixel capacitor is connected to a control electrode of the first switch tube, and a second electrode of the first switch tube is connected to the light-emitting module; The voltage stabilizing module is configured to output a first voltage to the first end of the pixel capacitor based on a power supply voltage provided by the power supply chip, and a voltage value of the first voltage is stabilized in a target voltage range; The first switch tube is configured to output a target current to the light-emitting module based on a second voltage provided by the second end of the pixel capacitor and the power supply voltage, so that a light-emitting brightness of the light-emitting module is a target brightness; and the second voltage is obtained by the pixel capacitor after charging based on the first voltage.

2. The pixel circuit of claim 1, wherein, The pixel circuit further comprises a switching module connected to the second end of the pixel capacitor. The switching module is configured to output a data voltage to the second end of the pixel capacitor in a charging phase of the pixel capacitor, so that the pixel capacitor charges based on the data voltage and the first voltage, and the data voltage is obtained based on the target brightness. The switching module is further configured to trigger the first switch tube to output the target current to the light-emitting module based on the second voltage provided by the second end of the pixel capacitor after charging and the power supply voltage in a discharging phase of the pixel capacitor.

3. The pixel circuit of claim 2, wherein, The switching module comprises a second switch tube, a third switch tube, a fourth switch tube and a fifth switch tube, a first electrode of the second switch tube is connected to the first electrode of the first switch tube, the third switch tube is connected between the input end of the voltage stabilizing module and the first electrode of the first switch tube, the fourth switch tube is connected between the light-emitting module and the second electrode of the first switch tube, and the fifth switch tube is connected between the second end of the pixel capacitor and the second electrode of the first switch.

4. The pixel circuit of claim 3, wherein when the first switch tube, the second switch tube and the fifth switch tube are turned on, a second electrode of the second switch tube is configured to receive the data voltage to output the data voltage to the second end of the pixel capacitor; when the second switch tube and the fifth switch tube are turned off and the third switch tube and the fourth switch tube are turned on, the first switch tube outputs the target current to the light-emitting module based on the second voltage and the power supply voltage.

5. The pixel circuit according to claim 3 or 4, characterized in that, The pixel circuit further comprises a sixth switch tube, a seventh switch tube and an eighth switch tube, the second electrode of the first switch tube is connected to a first electrode of the sixth switch tube and a first electrode of the seventh switch tube, a first electrode of the eighth switch tube is connected to an anode of the light-emitting module, and a cathode of the light-emitting module is grounded.

6. The pixel circuit of claim 5, wherein When the fifth switch tube and the sixth switch tube are turned on, the second electrode of the sixth switch tube is used to receive a third voltage to perform voltage reset on the second end of the pixel capacitor; When the seventh switch tube is turned on, the second electrode of the seventh switch tube is used to receive a fourth voltage to perform voltage reset on the fourth switch tube; When the eighth switch tube is turned on, the second electrode of the eighth switch tube is used to receive a fifth voltage to perform voltage reset on the anode of the light-emitting module.

7. A display panel, characterized by, The display panel comprises a voltage stabilizing module and a plurality of light-emitting circuits, an input end of the voltage stabilizing module is used to connect a power supply chip, each light-emitting circuit comprises a pixel capacitor, a light-emitting module and a first switch tube, a first end of the pixel capacitor is connected to an output end of the voltage stabilizing module, a second end of the pixel capacitor is connected to a control electrode of the first switch tube, a first electrode of the first switch tube is used to connect the power supply chip, and a second electrode of the first switch tube is connected to the light-emitting module; The voltage stabilizing module is used to output a first voltage to the first end of each pixel capacitor based on a power supply voltage provided by the power supply chip, and the voltage of the first voltage is stable in a target voltage range. In each light-emitting circuit, the first switch tube is used to output a target current to the light-emitting module based on a second voltage provided by the second end of the pixel capacitor and the power supply voltage, so that the light-emitting brightness of the light-emitting module is a target brightness, and the second voltage is obtained by the pixel capacitor after charging the first voltage.

8. The display panel of claim 7, wherein, The display panel further comprises a first power supply interface and a second power supply interface, the first power supply interface and the second power supply interface are used to connect the power supply chip, the first power supply interface is further connected to the first electrode of the first switch tube in each light-emitting circuit, and the second power supply interface is further connected to the input end of the voltage stabilizing module.

9. A display module, characterized by The display module comprises a display panel and a voltage stabilizing module, the display panel comprises a first power supply interface, a second power supply interface and a plurality of light-emitting circuits, each light-emitting circuit comprises a pixel capacitor, a light-emitting module and a first switch tube, the first power supply interface and an input end of the voltage stabilizing module are used to connect a power supply chip, the first power supply interface is further connected to a first electrode of each first switch tube, the second power supply interface is connected to an output end of the voltage stabilizing module and a first end of each pixel capacitor, a second end of the pixel capacitor is connected to a control electrode of the first switch tube, and a second electrode of the first switch tube is connected to the light-emitting module; The voltage stabilizing module is used to output a first voltage to the first end of each pixel capacitor based on a power supply voltage provided by the power supply chip, and the voltage of the first voltage is stable in a target voltage range. In each light-emitting circuit, the first switch tube is used to output a target current to the light-emitting module based on a second voltage provided by the second end of the pixel capacitor and the power supply voltage, so that the light-emitting brightness of the light-emitting module is a target brightness, and the second voltage is obtained by the pixel capacitor after charging the first voltage.

10. The display module of claim 9, wherein, The display module further comprises a driving chip configured to provide a data voltage to the display panel, and the voltage stabilizing module is arranged on the driving chip.

11. An electronic device, comprising: The electronic device comprises a power supply chip and the display panel of claim 7 or 8, or the electronic device comprises a power supply chip and the display module of claim 9 or 10, and the power supply chip is configured to provide a power supply voltage to the display module or the display panel.

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