Pixel circuit, display module and electronic equipment

Abstract

The invention discloses a pixel circuit, a display module and electronic equipment, and relates to the technical field of electronics. The pixel circuit provided by the invention comprises a light-emitting module, a first light-emitting control circuit and a second light-emitting control circuit, wherein the light-emitting module is connected with the first light-emitting control circuit and the second light-emitting control circuit respectively; wherein the pixel circuit has a first working state and a second working state; in a first working state, the first light-emitting control circuit controls the light-emitting module to be in a light-emitting state, and the second light-emitting control circuit is in a pixel refreshing state; and in a second working state, the second light-emitting control circuit controls the light-emitting module to be in a light-emitting state, and the first light-emitting control circuit is in a pixel refreshing state.

Description

Technical Field

[0001] The present application belongs to the field of electronic technology, and specifically relates to a pixel circuit, a display module and an electronic device. Background Art

[0002] At present, light-emitting diodes such as AMOLED (Active-matrix organic light-emitting diode), Mini LED (sub-millimeter light-emitting diode), Micro LED (micrometer light-emitting diode) are widely used in display modules of smart terminals due to their advantages such as high contrast and high color gamut. The display module uses pixel circuits to drive each row of LED (Light-Emitting Diode, organic light-emitting diode) pixels to emit light to realize image display.

[0003] In the related art, when each row of LED pixels is refreshed, it is necessary to turn off the light emission of the LED pixels, refresh the pixel circuit, and then turn on the light emission of the LED pixels after refreshing the pixel circuit. For example, the pixel circuit generally includes a storage capacitor, and refreshing the pixel circuit can be initializing the previous frame of display data in the storage capacitor, writing the next frame of display data in the storage capacitor, initializing the LED pixels, and so on. These refreshing processes all require turning off the light emission of the LED pixels. Therefore, when each row of pixels refreshes data, the LED pixels need to be turned off for a period of time.

[0004] However, in the process of refreshing LED pixels, turning off the LED pixels will cause flickering on the display screen, thus affecting the display effect. Taking a screen with a refresh rate of 60Hz as an example, each row of pixels needs to be refreshed 60 times in 1 second, that is, it is turned on and off 60 times. This low-frequency flickering will cause discomfort to the human eye, and the longer the LED pixels are turned off, the more severe the flickering effect is, and the greater the impact on the human eye. Summary of the invention

[0005] The embodiments of the present application provide a pixel circuit, a display module and an electronic device to solve the technical problem in the related art that during the LED pixel refresh process, when the LED pixel light emission is turned off, the display screen will flicker, thereby affecting the display effect.

[0006] In a first aspect, an embodiment of the present application provides a pixel circuit, comprising: A light emitting module, a first light emitting control circuit and a second light emitting control circuit, wherein the light emitting module is connected to the first light emitting control circuit and the second light emitting control circuit respectively; Among them, the pixel circuit has a first working state and a second working state; in the first working state, the first light-emitting control circuit controls the light-emitting module to emit light, and the second light-emitting control circuit is in a pixel refresh state; in the second working state, the second light-emitting control circuit controls the light-emitting module to emit light, and the first light-emitting control circuit is in a pixel refresh state.

[0007] In a second aspect, an embodiment of the present application proposes a display module, including: a pixel circuit as in the first aspect.

[0008] In a third aspect, an embodiment of the present application provides an electronic device, including: a display module as in the second aspect.

[0009] In an embodiment of the present application, a pixel circuit includes a light-emitting module, a first light-emitting control circuit and a second light-emitting control circuit, wherein the light-emitting module is connected to the first light-emitting control circuit and the second light-emitting control circuit respectively; wherein the pixel circuit has a first working state and a second working state; in the first working state, the first light-emitting control circuit controls the light-emitting module to be in a light-emitting state, and the second light-emitting control circuit is in a pixel refresh state; in the second working state, the second light-emitting control circuit controls the light-emitting module to be in a light-emitting state, and the first light-emitting control circuit is in a pixel refresh state. In this way, when the first light-emitting control circuit is in a pixel refresh state, the second light-emitting control circuit can control the light-emitting module to emit light, and when the second light-emitting control circuit is in a pixel refresh state, the first light-emitting control circuit can control the light-emitting module to emit light, and the light-emitting module is alternately controlled to emit light by the first light-emitting control circuit and the second light-emitting control circuit. Compared with the related art, in the process of refreshing the pixel circuit, it is possible to avoid turning off the light-emitting module when the light-emitting control circuit is refreshing, thereby reducing the time for the pixel circuit to turn off the light-emitting, effectively alleviating the stroboscopic phenomenon, and improving the display effect of the pixel circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 is a schematic diagram of a pixel circuit provided in the related art; Figure 2 yes Figure 1 A schematic diagram of the working timing of the pixel circuit shown; Figure 3 is a schematic diagram of a display module provided in the related art; Figure 4 is a schematic diagram of a pixel circuit provided in an embodiment of the present application; Figure 5 is a schematic diagram of another pixel circuit provided in an embodiment of the present application; Figure 6 is a schematic diagram of another pixel circuit provided in an embodiment of the present application; Figure 7 is a schematic diagram of another pixel circuit provided in an embodiment of the present application; Figure 8 is a schematic diagram of another pixel circuit provided in an embodiment of the present application; Figure 9-1 is a schematic diagram of another pixel circuit provided in an embodiment of the present application; Figure 9-2 yes Figure 9-1 A schematic diagram of the working timing of the pixel circuit shown; Figure 10-1 is a schematic diagram of another pixel circuit provided in an embodiment of the present application; Figure 10-2 yes Figure 10-1 A schematic diagram of the working timing of the pixel circuit shown; Fig.11 is a schematic diagram of a display module provided in an embodiment of the present application; Fig.12 is a schematic diagram of another display module provided in an embodiment of the present application; Fig.13 It is a schematic diagram of an electronic device provided in an embodiment of the present application.

[0011] Description of reference numerals: 100-pixel circuit; 110-light-emitting module; D-light-emitting diode; Clu-parasitic capacitor; D1-first light-emitting diode; Clu1-first parasitic capacitor; D2-second light-emitting diode; Clu2-second parasitic capacitor; 120-first light-emitting control circuit; 121-first driving module; Cst1-first storage capacitor; 1211-first switch module; T1-first driving transistor; T2-fifth switch tube; T3-first threshold voltage compensation tube; T4-first capacitor reset tube; T5-first switch tube; T6-second switch tube; T7-voltage reset tube; T7'-first voltage reset tube; 130-second light-emitting control circuit; 131-second driving module; Cst2-second storage capacitor; 1311-second switch module; T8-second driving transistor; T9-sixth switch tube; T10-second threshold voltage compensation tube voltage compensation tube; T11-second capacitor reset tube; T12-third switch tube; T13-fourth switch tube; T14-second voltage reset tube; ELVDD-positive voltage terminal; ELVSS-negative voltage terminal; V1-first voltage terminal; V2-second voltage terminal; Vint1-third voltage terminal; Vint2-fourth voltage terminal; Scan2-first scan signal terminal; Scan4-second scan signal terminal; Scan1-third scan signal terminal; Scan3-fourth scan signal terminal; Pscan-fifth scan signal terminal; Pscan1-sixth scan signal terminal; Pscan2-seventh scan signal terminal; Data-display data signal terminal; 200-display module; 210-display driver chip; 220-power management chip; 230-scan drive circuit; 240-light-emitting drive circuit; 300-electronic device. DETAILED DESCRIPTION

[0012] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0013] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0014] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0015] At present, in the display modules of terminal devices such as mobile phones and tablets, the relevant technologies generally adopt Figure 1 The 7T1C circuit shown is used as a driving circuit for a single LED pixel. Figure 1 As shown, the pixel circuit may include a single LED light-emitting pixel located in the nth row, and a driving circuit for the LED light-emitting pixel. Figure 1 , the light-emitting diode D is an LED pixel, Clu is the parasitic capacitance of the light-emitting diode D, and the driving circuit includes 7 thin film transistors (TFT) and 1 storage capacitor (Capacitor). Among them, Cst is the storage capacitor, T1 is the driving transistor, T2 is the switch tube of the Data signal, T3 is the switch tube for the threshold voltage compensation of T1, T4 is the switch tube for initializing the Cst storage capacitor, T5 is the switch tube for the positive voltage ELVDD, T6 is the switch tube for the negative voltage ELVSS, T7 is the switch tube for resetting the anode voltage of the light-emitting diode D, T3 and T4 are NMOS (N-channel metal oxide semiconductor field effect transistor), T1, T2, T5, T6, and T7 are PMOS (P-channel metal oxide semiconductor field effect transistor), point A is the source node of T1, and point B is the gate node of T1.

[0016] Among them, reference Figure 1 , Nscan[n-1] is the n-1th row scan signal, used to control the gate of T4 tube, Nscan[n] is the nth row scan signal, used to control the gate of T3 tube, Pscan[n] is the nth row scan signal, used to control the gate of T2 tube / T7 tube, Data is the display data signal, Vint1 is the Cst capacitor initialization voltage, Vint2 is the anode initialization voltage of light-emitting diode D (that is, Clu capacitor initialization voltage), ELVDD is the positive electrode voltage of light-emitting diode D, ELVSS is the negative electrode voltage of light-emitting diode D, EM is the light-emitting control signal, used to control the gate of T5 tube / T6 tube.

[0017] Figure 1 The working timing of the pixel circuit shown can be referred to Figure 2 .like Figure 2 As shown, Figure 1 The workflow of the pixel circuit shown in one frame is divided into the following five time periods: During the t1 period, the light-emitting control signal EM[n] of the nth row is at a low level, turning on the T5 and T6 tubes, and driving the LED pixels (i.e., light-emitting diodes D) to emit light. At the end of the t1 period, the light-emitting control signal EM[n] of the nth row changes from a low level to a high level, turning off the T5 and T6 tubes, and turning off the LED pixels to facilitate the subsequent pixel circuits to perform a series of actions during the period when the EM[n] signal is pulled high, and write the next frame of display data signals into the storage capacitor Cst.

[0018] During the t2 time period, the row scan signal Nscan[n-1] of the n-1th row is at a high level, turning on the T4 tube, and the initialization voltage Vint1 adjusts the voltage at point B to the negative voltage value of Vint1, that is, initializing the storage capacitor Cst, thereby preventing the residual storage voltage in the storage capacitor Cst from affecting the display of the next frame of data.

[0019] During the t3 period, the row scan signal Pscan[n] of the nth row is at a low level, turning on the T2 tube; the row scan signal Nscan[n] of the nth row is at a high level, turning on the T3 tube; the row scan signal Nscan[n-1] of the n-1th row is at a low level, turning off the T4 tube. Turning on the T2 tube allows the display data of the current row to be written, that is, setting the voltage at point A to V Data Voltage. At this time, the voltage at point B is initially negative in the previous time period, and the T1 tube remains turned on. The turning on of the T3 tube shorts the gate and source of the T1 tube. Since the driver tube T1 works in the saturation region, there is a threshold voltage V between the source and drain of the T1 tube. TH , so the potential at point B will be charged to V Data -V TH After that, the storage capacitor Cst is in a charging state, and the voltage stored in the storage capacitor Cst is V Data -V TH , which is the threshold voltage V of the subsequent compensation T1 tube TH Be prepared.

[0020] During the t4 time period, the row scan signal Pscan[n] of the nth row is at a low level, turning on the T7 tube, and the anode potential of the LED pixel will be initialized to the Vint2 voltage, that is, the parasitic capacitor Clu will be reset (initialized) to prevent the residual storage voltage in the parasitic capacitor Clu from affecting the display of the next frame of data.

[0021] In the t5 period, the light-emitting control signal EM[n] of the nth row is pulled low, turning on the T5 and T6 tubes. At this time, the storage voltage of the storage capacitor Cst is V Data -V TH , the storage capacitor Cst enters the discharge state, keeping the T1 tube turned on. At this time, the current flowing through the driver tube T1 is I= (1 / 2) K [ELVDD-(VData ‐|V TH |)‐|V TH |] 2 =(1 / 2) K (ELVDD-VData) 2 , K is a constant (the constant K can be determined based on the parameters such as the oxide layer capacitance, channel width, channel length and electron mobility of the driver tube T1), eliminating the threshold voltage V TH Under the influence of, current I flows through the LED pixel (ie, light-emitting diode D), making it in a light-emitting state.

[0022] Figure 3 It is a related technology based on Figure 1 The display module composed of the pixel circuit shown in FIG. Figure 3 As shown, DDIC (Display Driver IC) controls the output of Data, Vint1 and Vint2 signals. In addition, DDIC also controls Scan Driver (scanning driver circuit) to output Scan signal (display scanning signal), and DDIC also controls EMDriver (luminescence driver circuit) to output EM signal (luminescence control signal), wherein Scan signal includes Figure 1 The Pscan and Nscan signals shown; PMIC (Power Management IC) controls the output of ELVDD and ELVSS. When the Scan signal is valid, the Data display signal of the current row is written into the pixel circuit Pixel, and then EM is turned on, and ELVDD and ELVSS power the LED light-emitting pixel to make it emit light.

[0023] The applicant noted that in the related art, when each row of LED pixels is refreshed, it is necessary to turn off the LED pixels, initialize the previous frame of data in the storage capacitor (corresponding to the t2 time period), write the next frame of data in the storage capacitor (corresponding to the t3 time period), and initialize the LED pixels (corresponding to the t4 time period), and then turn on the EM signal to make the LED pixels emit light. Therefore, each row of pixels needs to be closed for at least t2+t3+t4 to refresh the data, that is, the time for the EM signal to be pulled high and turned off is t2+t3+t4. Taking a 60Hz screen as an example, each row of pixels needs to be refreshed 60 times in 1 second, that is, it is repeatedly turned on and off 60 times. This low-frequency stroboscopic effect will cause discomfort to the human eye, and the longer the closure time, the more serious the stroboscopic effect, and the greater the impact on the human eye.

[0024] Based on this, the pixel circuit provided in the embodiment of the present application can avoid turning off the LED pixel light emission when one driving circuit is refreshing the pixel by setting a symmetrical driving circuit, thereby reducing the off time of the LED pixel and reducing or completely eliminating the display flicker problem. Figure 9-1 As shown, by adding a corresponding number of TFT pixel circuits with a symmetrical structure, when displaying image data of two adjacent frames, two symmetrical light-emitting control circuits are used to alternately control the light-emitting of LED pixels, and there is no need to turn off the light-emitting of LED pixels when one of the light-emitting control circuits is refreshed, thereby reducing the off time of LED pixels and effectively alleviating the stroboscopic problem. Furthermore, as Figure 10-1 As shown, the embodiment of the present application can also add a symmetrical LED pixel and a corresponding light-emitting control circuit, so that the image data of two adjacent frames are alternately illuminated by two LEDs, directly eliminating the off time of the LED pixel and completely eliminating the flicker problem.

[0025] The pixel circuit, display module and electronic device provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0026] like Figure 4 As shown, the embodiment of the present application provides a pixel circuit 100, which may include: A light emitting module 110, a first light emitting control circuit 120 and a second light emitting control circuit 130, wherein the light emitting module 110 is connected to the first light emitting control circuit 120 and the second light emitting control circuit 130 respectively; Among them, the pixel circuit 100 has a first working state and a second working state; in the first working state, the first light-emitting control circuit 120 controls the light-emitting module 110 to emit light, and the second light-emitting control circuit 130 is in a pixel refresh state; in the second working state, the second light-emitting control circuit 130 controls the light-emitting module 110 to emit light, and the first light-emitting control circuit 120 is in a pixel refresh state.

[0027] In the embodiment of the present application, the light emitting module 110 may include at least one light emitting diode, for example, one light emitting diode, or two light emitting diodes, etc. The present application does not limit the number of light emitting diodes in the light emitting module.

[0028] The light-emitting diode in the light-emitting module may be an OLED (Organic Light-Emitting Diode) or other types of light-emitting diodes. The present application does not limit the type of the light-emitting diode in the light-emitting module.

[0029] The light emitting diodes in the light emitting module may be millimeter-level light emitting diodes, or micrometer-level light emitting diodes, etc. The present application does not limit the size of the light emitting diodes in the light emitting module.

[0030] In the embodiment of the present application, the first light emitting control circuit 120 and the second light emitting control circuit 130 may be two symmetrical control circuits, which may be used to control the light emitting module 110 to enter a light emitting state in turn.

[0031] In the embodiment of the present application, the first light-emitting control circuit 120 may include a storage capacitor and multiple TFTs, and the second light-emitting control circuit 130 may include a storage capacitor and multiple TFTs. The present application does not specifically limit the number of TFTs in the first light-emitting control circuit 120 / the second light-emitting control circuit 130. Each TFT in the first light-emitting control circuit 120 and the second light-emitting control circuit 130 may be an NMOS or a PMOS, and the present application does not limit the specific type of the TFT.

[0032] It should be pointed out that in the related art, the LED pixel needs to be turned off during the process of refreshing the pixel circuit, resulting in a stroboscopic problem. In the embodiment of the present application, when the first light-emitting control circuit 120 is in the pixel refresh state, the second light-emitting control circuit 130 can control the light-emitting module 110 to emit light, and when the second light-emitting control circuit 130 is in the pixel refresh state, the first light-emitting control circuit 120 can control the light-emitting module 110 to emit light. In this way, when displaying image data of two adjacent frames, the light-emitting module 110 can be alternately controlled by the first light-emitting control circuit 120 and the second light-emitting control circuit 130. Compared with the related art, during the process of refreshing the pixel circuit, it is possible to avoid turning off the light-emitting module when the light-emitting control circuit is refreshed, thereby reducing the time for the light-emitting module in the pixel circuit to turn off the light, effectively alleviating the stroboscopic phenomenon, and improving the display effect of the pixel circuit.

[0033] According to the pixel circuit provided by the embodiment of the present application, it includes a light-emitting module, a first light-emitting control circuit and a second light-emitting control circuit, and the light-emitting module is connected to the first light-emitting control circuit and the second light-emitting control circuit respectively; wherein the pixel circuit has a first working state and a second working state; in the first working state, the first light-emitting control circuit controls the light-emitting module to be in a light-emitting state, and the second light-emitting control circuit is in a pixel refresh state; in the second working state, the second light-emitting control circuit controls the light-emitting module to be in a light-emitting state, and the first light-emitting control circuit is in a pixel refresh state. In this way, when the first light-emitting control circuit is in the pixel refresh state, the second light-emitting control circuit can control the light-emitting module to emit light, and when the second light-emitting control circuit is in the pixel refresh state, the first light-emitting control circuit can control the light-emitting module to emit light, and the light-emitting module is alternately controlled to emit light by the first light-emitting control circuit and the second light-emitting control circuit. Compared with the related art, in the process of refreshing the pixel circuit, it can be avoided to turn off the light-emitting module when the light-emitting control circuit is refreshed, thereby reducing the time for the pixel circuit to turn off the light-emitting, effectively alleviating the stroboscopic phenomenon, and improving the display effect of the pixel circuit.

[0034] The pixel circuit provided in the embodiment of the present application is described below by way of example in combination with the specific structure of the first light emitting control circuit / the second light emitting control circuit.

[0035] In a specific embodiment, in order to use the first light emitting control circuit 120 and the second light emitting control circuit 130 to alternately control the light emitting module 110 to emit light, as shown in FIG. Figure 5 As shown, in the pixel circuit 110 provided in the embodiment of the present application, one end of the first light-emitting control circuit 120 is connected to the first voltage terminal V1, and the other end of the first light-emitting control circuit 120 is connected to the first end of the light-emitting module 110; one end of the second light-emitting control circuit 130 is connected to the first voltage terminal V1, and the other end of the second light-emitting control circuit 130 is connected to the first end of the light-emitting module 110, and the second end of the light-emitting module 110 is connected to the second voltage terminal V2; The first light emitting control circuit 120 includes a first driving module 121, one end of the first driving module 121 is connected to the first voltage terminal V1, and the other end of the first driving module 121 is coupled to the first end of the light emitting module 110; The second light emitting control circuit 130 includes a second driving module 131 . One end of the second driving module 131 is connected to the first voltage end V1 , and the other end of the second driving module 131 is coupled to the first end of the light emitting module 110 .

[0036] The first voltage terminal V1 may be a positive voltage terminal, and the second voltage terminal V2 may be a negative voltage terminal. Of course, the first voltage terminal V1 may be a negative voltage terminal, and the second voltage terminal V2 may be a positive voltage terminal, and this application does not impose any specific limitation on this.

[0037] The first driving module 121 or the second driving module 131 can drive the light-emitting module 110 to enter the light-emitting state. For example, when the first light-emitting control circuit 120 is in the pixel refresh state, the second driving module 131 can drive the light-emitting module 110 to emit light, which can avoid turning off the light-emitting module when the first light-emitting control circuit is refreshed; similarly, when the second light-emitting control circuit 130 is in the pixel refresh state, the first driving module 121 can drive the light-emitting module 110 to emit light, which can avoid turning off the light-emitting module when the second light-emitting control circuit is refreshed.

[0038] In this way, when displaying image data of two adjacent frames, the light-emitting module 110 is alternately controlled to emit light through the first driving module 121 and the second driving module 131, which can avoid turning off the light-emitting module when the light-emitting control circuit is refreshed, thereby reducing the time for the light-emitting module in the pixel circuit to turn off the light, effectively alleviating the stroboscopic phenomenon, and improving the display effect of the pixel circuit.

[0039] For example, refer to Figure 6 , the first driving module 121 may include a first switch module 1211, a first driving transistor T1 and a first storage capacitor Cst1; the first end of the first storage capacitor Cst1 is connected to the first voltage end V1, the second end of the first storage capacitor Cst1 is connected to the first end of the first driving transistor T1, the second end of the first driving transistor T1 is coupled to the light emitting module 110, the third end of the first driving transistor T1 is coupled to the first voltage end V1, and the first switch module 1211 is connected to the second end or the third end of the first driving transistor T1; The second driving module may include a second switch module 1311, a second driving transistor T8 and a second storage capacitor Cst2; the first end of the second storage capacitor Cst2 is connected to the first voltage end V1, the second end of the second storage capacitor Cst2 is connected to the first end of the second driving transistor T8, the second end of the second driving transistor T8 is coupled to the light emitting module 110, the third end of the second driving transistor T8 is coupled to the first voltage end V1, and the second switch module 1311 is connected to the second end or the third end of the second driving transistor T8.

[0040] The first switch module 1211 may be disposed between the first voltage terminal V1 and the light emitting module 110, and the light emitting module 110 is connected to the first voltage terminal V1 via the first switch module 1211 and the first driving transistor T1. Similarly, the second switch module 1311 may be disposed between the first voltage terminal V1 and the light emitting module 110, and the light emitting module 110 is connected to the first voltage terminal V1 via the second switch module 1311 and the second driving transistor T8.

[0041] The first switch module 1211 / the second switch module 1311 is used to control the opening and closing of the light emitting module 110. The first switch module 1211 may include at least one switch tube, and the second switch module 1311 may include at least one switch tube. The present application does not specifically limit the number of switch tubes of the first switch module 1211 / the second switch module 1311.

[0042] For example, Figure 6 As shown, the first switch module may include a first switch tube T5 and a second switch tube T6; the second end of the first driving transistor T1 is connected to the light emitting module 110 via the second switch tube T6, and the third end of the first driving transistor T1 is connected to the first voltage end V1 via the first switch tube T5.

[0043] The second switch module may include a third switch tube T12 and a fourth switch tube T13; the second end of the second driving transistor T8 is connected to the light emitting module 110 via the fourth switch tube T13, and the third end of the second driving transistor T8 is connected to the first voltage end V1 via the third switch tube T12.

[0044] Among them, the first switch tube T5, the second switch tube T6, the third switch tube T12 and the fourth switch tube T13 can be NMOS or PMOS, and the present application does not limit the specific type of the switch tube.

[0045] The first switch tube T5 and the second switch tube T6 can be controlled by the same light-emitting control signal EM_A, and the third switch tube T12 and the fourth switch tube T13 can be controlled by the same light-emitting control signal EM_B.

[0046] The light-emitting control signal EM_A and the light-emitting control signal EM_B may be the same signal or different signals, and this application does not impose any specific limitation on this.

[0047] In the first working state, the first switch module 1211 is turned on, the first storage capacitor Cst1 is in a discharging state, and the first driving transistor T1 is turned on, so that the light-emitting module is in a light-emitting state; In the second working state, the second switch module 1311 is turned on, the second storage capacitor Cst2 is in a discharging state, and the second driving transistor T8 is turned on, so that the light emitting module is in a light emitting state.

[0048] Among them, in the first working state, when the second light-emitting control circuit 130 is in the pixel refresh state, the first driving module 121 can drive the light-emitting module 110 to emit light. Specifically, the first storage capacitor Cst1 enters the discharge state, and the first driving transistor T1 is kept turned on. At the same time, the first switch module 1211 can be turned on by the light-emitting control signal (EM_A signal), so that the first driving transistor T1 drives the light-emitting module 110 to emit light. In this way, it is possible to avoid turning off the light-emitting module when the second light-emitting control circuit is refreshed, thereby reducing the time for the light-emitting module in the pixel circuit to turn off the light, and effectively alleviating the stroboscopic phenomenon.

[0049] Similarly, in the second working state, when the first light-emitting control circuit 120 is in the pixel refresh state, the second driving module 131 can drive the light-emitting module 110 to emit light. Specifically, the second storage capacitor Cst2 enters the discharge state, keeps the second driving transistor T8 turned on, and at the same time, the second switch module 1311 can be turned on by the light-emitting control signal (EM_B signal), so that the second driving transistor T8 drives the light-emitting module 110 to emit light. In this way, it is possible to avoid turning off the light-emitting module when the first light-emitting control circuit is refreshed, thereby reducing the time for the light-emitting module in the pixel circuit to turn off the light, and effectively alleviating the stroboscopic phenomenon.

[0050] In practical applications, before the storage capacitor (eg, Cst1 / Cst2 ) enters a discharge state to drive the light-emitting module 110 to emit light, the pixel circuit provided in the embodiment of the present application may first charge the storage capacitor (ie, write display data into the storage capacitor).

[0051] For example, in a specific embodiment, Figure 7 As shown, the first light-emitting control circuit 120 may further include a fifth switch tube T2, the fifth switch tube T2 having a first end, a second end and a third end, the first end of the fifth switch tube T2 is connected to the first scan signal end Scan2, the second end of the fifth switch tube T2 is connected to the display data signal end Data, and the third end of the fifth switch tube T2 is coupled to the second end of the first storage capacitor Cst1; similarly, the second light-emitting control circuit 130 may further include a sixth switch tube T9, the sixth switch tube T9 having a first end, a second end and a third end, the first end of the sixth switch tube T9 is connected to the second scan signal end Scan4, the second end of the sixth switch tube T9 is connected to the display data signal end Data, and the third end of the sixth switch tube T9 is coupled to the second end of the second storage capacitor Cst2.

[0052] The fifth switch tube T2 / the sixth switch tube T9 may be NMOS or PMOS, and the present application does not limit the specific type of the switch tube.

[0053] When the second light-emitting control circuit 130 controls the light-emitting module 110 to display the image data of the nth frame, the embodiment of the present application can pre-write the image data of the n+1th frame output by the display data signal terminal Data into the first storage capacitor Cst1 by turning on the fifth switch tube T2.

[0054] In this way, when the image data of the n+1 frame is written into the first storage capacitor Cst1, the light-emitting module 110 still emits light under the control of the second light-emitting control circuit 130 to display the image data of the nth frame, which can avoid turning off the light-emitting module when the next frame data is written into the first storage capacitor Cst1, thereby reducing the time for the light-emitting module in the pixel circuit to turn off the light, and effectively alleviating the flicker phenomenon.

[0055] Similarly, when the first light-emitting control circuit 120 controls the light-emitting module 110 to display the image data of the n+1th frame, the embodiment of the present application can pre-write the image data of the n+2th frame output by the display data signal terminal Data into the second storage capacitor Cst2 by turning on the sixth switch tube T9.

[0056] In this way, when the image data of the n+2 frame is written into the second storage capacitor Cst2, the light-emitting module 110 still emits light under the control of the first light-emitting control circuit 130 to display the image data of the n+1 frame, which can avoid turning off the light-emitting module when the next frame data is written into the second storage capacitor Cst2, thereby reducing the time for the light-emitting module in the pixel circuit to turn off the light, and effectively alleviating the flicker phenomenon.

[0057] In practical applications, in order to compensate the threshold voltage of the driving transistor (T1 / T8), such as Figure 7 As shown, the first light-emitting control circuit 120 may also include a first threshold voltage compensation tube T3; the first end of the first threshold voltage compensation tube T3 is connected to the first scan signal end Scan2, the second end of the first threshold voltage compensation tube T3 is connected to the second end of the first storage capacitor Cst1, and the third end of the first threshold voltage compensation tube T3 is connected to the second end of the first driving transistor T1; the third end of the fifth switch tube T2 is connected to the third end of the first driving transistor T1; similarly, the second light-emitting control circuit 130 may also include a second threshold voltage compensation tube T10; the first end of the second threshold voltage compensation tube T10 is connected to the second scan signal end Scan4, the second end of the second threshold voltage compensation tube T10 is connected to the second end of the second storage capacitor Cst2, and the third end of the second threshold voltage compensation tube T10 is connected to the second end of the second driving transistor T8; the third end of the sixth switch tube T9 is connected to the third end of the second driving transistor T8.

[0058] The first threshold voltage compensation transistor T3 / the second threshold voltage compensation transistor T10 may be NMOS or PMOS, and the present application does not limit the specific type of T3 / T10.

[0059] Among them, in the first working state, when the second light emitting control circuit is in the pixel refresh state, the sixth switch tube T9 and the second threshold voltage compensation tube T10 are turned on, and the second storage capacitor Cst2 is in the charging state. In addition, the conduction of the T10 tube shorts the first end and the second end of the T8 tube. Since the T8 tube works in the saturation region, there is a threshold voltage V between the second end and the third end of the T8 tube. TH（T8） At this time, the second storage capacitor Cst2 is charged until V Data -V TH（T8） After the power is turned off, the voltage stored in the second storage capacitor Cst2 is V Data -V TH（T8） , which is the threshold voltage V of the subsequent compensation T8 tube TH（T8） Be prepared.

[0060] Among them, in the second working state, when the first light emitting control circuit is in the pixel refresh state, the fifth switch tube (T2) and the first threshold voltage compensation tube (T3) are turned on, and the first storage capacitor (Cst1) is in the charging state. In addition, the conduction of the T3 tube shorts the first end and the second end of the T1 tube. Since the T1 tube works in the saturation region, there is a threshold voltage V between the second end and the third end of the T1 tube. TH（T1） At this time, the first storage capacitor Cst1 is charged until V Data -V TH（T1） After being turned off, the voltage stored in the first storage capacitor Cst1 is V Data -V TH（T1） , which is the threshold voltage V of the subsequent compensation T1 tube TH（T1） Be prepared.

[0061] In this way, when the image data of the n+1 frame is written into the first storage capacitor Cst1, the light-emitting module 110 still emits light under the control of the second light-emitting control circuit 130 to display the image data of the nth frame, which can avoid turning off the light-emitting module when the next frame data is written into the first storage capacitor Cst1; and, when the image data of the n+2 frame is written into the second storage capacitor Cst2, the light-emitting module 110 still emits light under the control of the first light-emitting control circuit 130 to display the image data of the n+1 frame, which can avoid turning off the light-emitting module when the next frame data is written into the second storage capacitor Cst2, thereby reducing the time for the light-emitting module in the pixel circuit to turn off the light emission and effectively alleviating the flicker phenomenon.

[0062] In actual applications, before the storage capacitor (e.g., Cst1 / Cst2) enters the charging state, in order to prevent the residual storage voltage in the storage capacitor from affecting the display of the next frame of data, the pixel circuit provided in the embodiment of the present application can also initialize (i.e., reset) the storage capacitor (e.g., Cst1 / Cst2) first.

[0063] In a specific embodiment, in order to initialize the storage capacitor, refer to Figure 8 The first light-emitting control circuit 120 may further include a first capacitor reset tube T4, a first end of the first capacitor reset tube T4 is connected to the third scan signal terminal Scan1, a second end of the first capacitor reset tube T4 is connected to the third voltage terminal Vint1, and a third end of the first capacitor reset tube T4 is connected to the second end of the first storage capacitor Cst1; similarly, the second light-emitting control circuit 130 may further include a second capacitor reset tube T11, a first end of the second capacitor reset tube T11 is connected to the fourth scan signal terminal Scan3, a second end of the second capacitor reset tube T11 is connected to the third voltage terminal Vint1, and a third end of the second capacitor reset tube T11 is connected to the second end of the second storage capacitor Cst2.

[0064] The first capacitor reset tube T4 and the second capacitor reset tube T11 may be NMOS or PMOS, and the present application does not limit the specific type of the switch tube.

[0065] In the first working state, when the second light emitting control circuit is in the pixel refresh state, the second capacitor reset tube T11 is turned on, and the second storage capacitor Cst2 is in the reset state. For example, the fourth scanning signal terminal Scan3 outputs a high level, turns on the second capacitor reset tube T11, and the third voltage terminal Vint1 resets the voltage of the second storage capacitor Cst2 and initializes it to the voltage of Vint1.

[0066] In the second working state, when the first light emitting control circuit is in the pixel refresh state, the first capacitor reset tube T4 is turned on, and the first storage capacitor Cst1 is in the reset state. For example, the third scanning signal terminal Scan1 outputs a high level, turns on the first capacitor reset tube T4, and the third voltage terminal Vint1 resets the voltage of the first storage capacitor Cst1 and initializes it to the voltage of Vint1.

[0067] In this way, when the first storage capacitor Cst1 is reset (initialized), the light-emitting module 110 still emits light under the control of the second light-emitting control circuit 130 to display the image data of the nth frame, which can avoid turning off the light-emitting module when the first storage capacitor Cst1 is reset; and when the second storage capacitor Cst2 is reset (initialized), the light-emitting module 110 still emits light under the control of the first light-emitting control circuit 130 to display the image data of the n+1th frame, which can avoid turning off the light-emitting module when the second storage capacitor Cst2 is reset, thereby reducing the time for the light-emitting module in the pixel circuit to turn off the light and effectively alleviating the flicker phenomenon.

[0068] In practical applications, reference Figure 9-1 or Figure 10-1 The first light-emitting control circuit may include a first storage capacitor Cst1 and tubes T1 to T6, and the second light-emitting control circuit may include a second storage capacitor Cst2 and tubes T8 to T13. The first light-emitting control circuit and the second light-emitting control circuit have a symmetrical circuit structure. The light-emitting module 110 may include one light-emitting diode or at least two symmetrical light-emitting diodes. The following is an example.

[0069] For the case where the light emitting module includes a light emitting diode, refer to Figure 9-1 In the pixel circuit provided in the embodiment of the present application, the light-emitting module may include a light-emitting diode D, one end of the light-emitting diode D is connected to the second voltage terminal V2, and the other end of the light-emitting diode D is respectively connected to the first light-emitting control circuit and the second light-emitting control circuit.

[0070] The first light-emitting control circuit may include a first storage capacitor Cst1 and tubes T1 to T6; the second light-emitting control circuit may include a second storage capacitor Cst2 and tubes T8 to T13, and the first light-emitting control circuit and the second light-emitting control circuit have a symmetrical circuit structure. The first light-emitting control circuit and the second light-emitting control circuit may respectively control the light-emitting diode D to emit light to realize image display of two adjacent frames.

[0071] In this way, by increasing the corresponding number of TFT pixel circuits with a symmetrical structure, the LED pixels can be separately controlled by different light-emitting control circuits when displaying image data of two adjacent frames. There is no need to turn off the light-emitting of the LED pixels when one of the light-emitting control circuits is refreshed, thereby reducing the off time of the LED pixels and effectively alleviating the flicker problem.

[0072] Among them, reference Figure 9-1The light emitting module further includes a parasitic capacitor Clu connected in parallel with the light emitting diode D; the pixel circuit further includes a voltage reset tube T7, a first end of the voltage reset tube T7 is connected to the fifth scanning signal end Pscan, a second end of the voltage reset tube T7 is connected to the fourth voltage end Vint2, and a third end of the voltage reset tube T7 is connected to the parasitic capacitor Clu; The pixel circuit also has a third working state; in the third working state, the voltage reset tube T7 is turned on, and the parasitic capacitor Clu is in a reset state.

[0073] For example, the fifth scanning signal terminal Pscan outputs a low level, turns on the voltage reset tube T7, and the fourth voltage terminal Vint2 resets the voltage of the parasitic capacitor Clu and initializes it to the voltage of Vint2.

[0074] The voltage reset tube T7 may be an NMOS or a PMOS, and the present application does not limit the specific type of the T7 tube.

[0075] In this way, there is no need to turn off the light emitting diode D in the first working state and the second working state of the pixel circuit (i.e., the time period when the first light emitting control circuit and the second light emitting control circuit are refreshed). The light emitting diode D is turned off only in the third working state of the pixel circuit when the parasitic capacitor Clu is reset (initialized), which greatly reduces the turn-off time of the light emitting diode D and effectively alleviates the flicker problem.

[0076] Figure 9-2 for Figure 9-1 The working timing diagram of the pixel circuit shown in FIG. Figure 9-2 As shown, the workflow of the pixel circuit displaying image data of two adjacent frames may include: In the t1 period of the nth frame, EM_A is at a high level and EM_B is at a low level. At this time, the light-emitting diode D is driven by the T8 tube and is continuously lit. The left T1~T7 tubes are ready to write the next frame of data while EM_A is pulled high; In the t2 period of the nth frame, the scanning signal Scan1 is at a high level, the T4 tube is turned on, and the initialization voltage Vint1 initializes the first storage capacitor Cst1. At this time, the light-emitting diode D is still driven by the T8 tube in the lighting state; In the t3 period of the nth frame, the scanning signal Scan2 is pulled high, the scanning signal Scan1 is pulled low, the T2 and T3 tubes are turned on, and the T4 tube is turned off. The gate of the T1 tube is biased by the Cst1 voltage and remains turned on. The T2 tube is turned on to write the n+1th image data into Cst1. The T3 tube is turned on to short-circuit the gate and source of the T1 tube. The T1 tube works in the saturation region, and there is a threshold voltage V between the source and drain of the T1 tube. TH（T1） , the gate of T1 tube is always charged to V Data -VTH（T1） After the shutdown, the Cst storage voltage is V Data -V TH（T1） , for subsequent compensation V TH（T1） Make preparations, at this time, the light-emitting diode D is still driven by the T8 tube to light up this frame of image; In the t4 period of the nth frame, EM_B pulls up the level to turn off the light-emitting diode D, the Pscan scanning signal turns on the T7 tube, the anode potential of the light-emitting diode D will be initialized to the Vint2 voltage, and the parasitic capacitance Clu of the light-emitting diode D will be initialized; In the t5 period of the nth frame, EM_A pulls the level down, EM_B maintains the high level, T5 and T6 are turned on, and the voltage of the first storage capacitor Cst1 is V Data -V TH（T1） , keep T1 on. At this time, the current flowing through the driver tube T1 is I= (1 / 2)K [ELVDD-(V Data ‐|V TH（T1） |)‐|V TH（T1） |] 2 =(1 / 2) K (ELVDD-V Data ) 2 , K is a constant, eliminating the threshold voltage V of T1 tube TH（T1） Affected by the current, the light emitting diode D is passed to emit light, and the image data emitted at this time is the data of the n+1th frame.

[0077] In the t1 period of the n+1th frame, EM_A is at a low level and EM_B is at a high level. At this time, the light-emitting diode D is driven by the T1 tube to continuously light up. The right side T7~T13 tubes are ready to write the n+2th frame data during the period when EM_B is pulled high; In the t2 period of the n+1th frame, the Scan3 scanning signal is at a high level, the T11 tube is turned on, and the second storage capacitor Cst2 is initialized. At this time, the light-emitting diode D is driven by the T1 tube and is still lighting the n+1th frame; In the t3 period of the n+1th frame, the Scan4 scanning signal is high, turning on the T9 and T10 tubes, and the Scan3 scanning signal is low, turning off the T11 tube. The gate of the T8 tube is biased by the Cst2 voltage and remains open. The T10 tube is turned on to write the n+2th image data into Cst2. The opening of the T10 tube shorts the gate and source of the T8 tube. The T8 tube works in the saturation region, and there is also a threshold voltage V TH（T8） , the gate of T8 will be charged to V Data -V TH（T8） After the shutdown, the storage voltage of Cst2 is V Data -V TH（T8） , for subsequent compensation V TH（T8）To prepare, the light-emitting diode D is driven by the T1 tube and is still lighting up the n+1 frame image; In the t4 period of the n+1th frame, EM_A and EM_B are both high level, the light emitting diode D is turned off, the Pscan scanning signal turns on the T7 tube, the anode potential of the light emitting diode D is initialized, and the parasitic capacitance of the light emitting diode D is initialized; In the t5 period of the n+1th frame, EM_B is pulled low, EM_A maintains a high level, T12 and T13 are turned on, and the voltage of the second storage capacitor Cst2 is V Data -V TH（T8） , keep T8 on. At this time, the current flowing through the driver tube T8 is I= (1 / 2)K [ELVDD-(V Data ‐|V TH（T8） |)‐|V TH（T8） |] 2 =(1 / 2) K (ELVDD-V Data ) 2 , K is a constant, eliminating the threshold voltage V of the T8 tube TH（T8） Affected by the current I, the current I flows through the light-emitting diode D to make it emit light. At this time, the image data emitted is the data of the n+2th frame.

[0078] In this way, through Figure 9-2 As shown in the working sequence, when the current frame image is lit, the Scan scanning circuit will write the image data of the next frame in the symmetrical storage capacitor in advance, and the EM circuit only needs to be pulled high during the time period (t4 time period) when the light-emitting diode is reset. Figure 1 In the 7T1C pixel circuit shown, the light-emitting diode is turned off for at least t2+t3+t4 when displaying each frame of image, resulting in a flicker problem. However, in the solution of the embodiment of the present application, the light-emitting diode is turned off for t4 when displaying each frame of image, which shortens the length of time the light-emitting diode is turned off and optimizes the flicker problem.

[0079] In addition, in order to further shorten or even eliminate the length of time the LED is turned off, the pixel circuit may also be provided with at least two symmetrical LEDs to avoid the situation where the LED needs to be turned off due to LED reset when there is only one LED.

[0080] For the case where the light emitting module includes at least two light emitting diodes, refer to Figure 10-1In the pixel circuit provided in the embodiment of the present application, the light-emitting module may include a first light-emitting diode D1 and a second light-emitting diode D2, one end of the first light-emitting diode D1 is connected to the second voltage terminal V2, the other end of the first light-emitting diode D1 is connected to the first light-emitting control circuit, one end of the second light-emitting diode D2 is connected to the second voltage terminal V2, and the other end of the second light-emitting diode D2 is connected to the second light-emitting control circuit.

[0081] The first light-emitting control circuit may include a first storage capacitor Cst1 and tubes T1 to T6; the second light-emitting control circuit may include a second storage capacitor Cst2 and tubes T8 to T13, and the first light-emitting control circuit and the second light-emitting control circuit have a symmetrical circuit structure. The first light-emitting control circuit and the second light-emitting control circuit may respectively control the light-emitting diode D to emit light to realize image display of two adjacent frames.

[0082] Among them, in the first working state, the first light-emitting control circuit controls the first light-emitting diode D1 to be in a light-emitting state, and the second light-emitting control circuit is in a pixel refresh state; in the second working state, the second light-emitting control circuit controls the second light-emitting diode D2 to be in a light-emitting state, and the first light-emitting control circuit is in a pixel refresh state.

[0083] In this way, by increasing the number of light-emitting diodes with a symmetrical structure and the corresponding number of TFT pixel circuits with a symmetrical structure, the light-emitting module can use different light-emitting control circuits to separately control different light-emitting diodes when displaying image data of two adjacent frames. There is no need to turn off the light-emitting module when one of the light-emitting control circuits is refreshed, thereby reducing the shutdown time of the light-emitting module and effectively alleviating the flicker problem.

[0084] Furthermore, the light emitting module further includes a first parasitic capacitor Clu1 connected in parallel with the first light emitting diode D1, and a second parasitic capacitor Clu2 connected in parallel with the second light emitting diode D2; The first light emitting control circuit further includes a first voltage reset tube T7', a first end of the first voltage reset tube T7' is connected to the sixth scanning signal end Pscan1, a second end of the first voltage reset tube T7' is connected to the fourth voltage end Vint2, and a third end of the first voltage reset tube T7' is connected to the first parasitic capacitor Clu1; The second light-emitting control circuit also includes a second voltage reset tube T14, a first end of the second voltage reset tube T14 is connected to the seventh scan signal terminal Pscan2, a second end of the second voltage reset tube T14 is connected to the fourth voltage terminal Vint2, and a third end of the second voltage reset tube T14 is connected to the second parasitic capacitor Clu2.

[0085] Wherein, in the first working state, when the second light emitting control circuit is in a pixel refresh state, the second voltage reset tube T14 is turned on, and the second parasitic capacitor Clu2 is in a reset state; Among them, in the second working state, when the first light emitting control circuit is in the pixel refresh state, the first voltage reset tube T7 is turned on, and the first parasitic capacitor Clu1 is in the reset state.

[0086] In this way, when the first parasitic capacitor Clu1 of the first light-emitting diode D1 is reset (initialized), the second light-emitting diode D2 can still emit light under the control of the second light-emitting control circuit to display the image data of the nth frame, which can avoid turning off the light-emitting module when the first parasitic capacitor Clu1 is reset; and, when the second parasitic capacitor Clu2 of the second light-emitting diode D2 is reset (initialized), the first light-emitting diode D1 can still emit light under the control of the first light-emitting control circuit to display the image data of the n+1th frame, which can avoid turning off the light-emitting module when the second parasitic capacitor Clu2 is reset, thereby eliminating the time for the light-emitting module in the pixel circuit to turn off the light, and eliminating the flicker phenomenon.

[0087] Among them, reference Figure 10-1 , when the first light-emitting control circuit includes a first switch tube T5 and a second switch tube T6, and the second light-emitting control circuit includes a third switch tube T12 and a fourth switch tube T13, the control end of the first switch tube T5, the control end of the second switch tube T6, the control end of the third switch tube T12, and the control end of the fourth switch tube T13 are connected to the same control source through the same wire; The first switch tube T5 and the second switch tube T6 are PMOS, and the third switch tube T12 and the fourth switch tube T13 are NMOS.

[0088] It should be noted that, in the scenario where the first light-emitting control circuit controls the first light-emitting diode D1 and the second light-emitting control circuit controls the second light-emitting diode D2, the working states of the first switch tube T5 and the second switch tube T6 are opposite to the working states of the third switch tube T12 and the fourth switch tube T13.

[0089] When the first switch tube T5 and the second switch tube T6 are PMOS and the third switch tube T12 and the fourth switch tube T13 are NMOS, the types of the first switch tube T5 and the second switch tube T6 are complementary to those of the third switch tube T12 and the fourth switch tube T13.

[0090] Alternatively, in other embodiments, the first switch tube T5 and the second switch tube T6 are NMOS, and the third switch tube T12 and the fourth switch tube T13 are PMOS, so that the types of the first switch tube T5 and the second switch tube T6 are complementary to the third switch tube T12 and the fourth switch tube T13.

[0091] In this case, the same signal EM can be used to control the first switch tube T5, the second switch tube T6, the third switch tube T12 and the fourth switch tube T13, thereby reducing the number of control signal lines and simplifying circuit connection relationships.

[0092] Of course, in other embodiments, the first switch tube T5, the second switch tube T6, the third switch tube T12 and the fourth switch tube T13 can also be set to PMOS, and two control signals EM_A and EM_B are used to control them respectively, EM_A controls the first switch tube T5 and the second switch tube T6, EM_B controls the third switch tube T12 and the fourth switch tube T13, and so on. The present application does not limit the specific types of the first switch tube T5, the second switch tube T6, the third switch tube T12 and the fourth switch tube T13.

[0093] For example, Figure 10-2 for Figure 10-1 The working timing diagram of the pixel circuit shown in FIG. Figure 10-2 As shown, the workflow of the pixel circuit displaying image data of two adjacent frames may include: During the t1 period of the nth frame, EM is at a high level. At this time, the T12 and T13 tubes are turned on, and the second light-emitting diode D2 is driven by the T8 tube and continuously lights up. The left T1~T7 tubes are ready to write the next frame of data during the period when EM is pulled high. In the t2 period of the nth frame, the scanning signal Scan1 is at a high level, the T4 tube is turned on, and the initialization voltage Vint1 initializes the first storage capacitor Cst1. At this time, the second light-emitting diode D2 is still driven by the T8 tube to light up the nth frame; In the t3 period of the nth frame, the scanning signal Scan2 is pulled high, the scanning signal Scan1 is pulled low, the T2 and T3 tubes are turned on, and the T4 tube is turned off. The gate of the T1 tube is biased by the Cst1 voltage and remains turned on. The T2 tube is turned on to write the n+1th image data into Cst1. The T3 tube is turned on to short-circuit the gate and source of the T1 tube. The T1 tube works in the saturation region, and there is a threshold voltage V between the source and drain of the T1 tube. TH（T1） , the gate of T1 tube is always charged to V Data -V TH（T1） After the shutdown, the Cst storage voltage is V Data -V TH（T1） , for subsequent compensation V TH（T1） To prepare, the second light emitting diode D2 is still driven by the T8 tube to light up this frame of image; In the t4 time period of the nth frame, the Pscan1 scanning signal turns on the T7 tube, the anode potential of the first light-emitting diode D1 is initialized to the Vint2 voltage, and the first parasitic capacitor Clu1 of the first light-emitting diode D1 is initialized. At this time, the second light-emitting diode D2 is still driven by the T8 tube to light up the nth frame; In the t5 period of the nth frame, EM pulls the level low, T5 and T6 are turned on, T12 and T13 are turned off, the second light emitting diode D2 is turned off, and the voltage of the first storage capacitor Cst1 is V Data -V TH（T1） , keep T1 on. At this time, the current flowing through the driver tube T1 is I= (1 / 2) K [ELVDD-(V Data ‐|V TH（T1） |)‐|V TH（T1） |] 2 =(1 / 2) K (ELVDD-V Data ) 2 , K is a constant, eliminating the threshold voltage V of T1 tube TH（T1） Affected by the current, the current flows through the first light emitting diode D1 to make it emit light. At this time, the image data emitted is the data of the n+1th frame.

[0094] During the t1 period of the n+1th frame, EM is at a low level. At this time, the first light-emitting diode D1 is driven by the T1 tube to continuously light up. The right T7~T13 tubes prepare to write the n+2th frame data during the period when EM is pulled low. In the t2 period of the n+1th frame, the Scan3 scanning signal is at a high level, the T11 tube is turned on, and the second storage capacitor Cst2 is initialized. At this time, the first light-emitting diode D1 is driven by the T1 tube and is still lighting the n+1th frame; In the t3 period of the n+1th frame, the Scan4 scanning signal is high, turning on the T9 and T10 tubes, and the Scan3 scanning signal is low, turning off the T11 tube. The gate of the T8 tube is biased by the Cst2 voltage and remains open. The T10 tube is turned on to write the n+2th image data into Cst2. The opening of the T10 tube shorts the gate and source of the T8 tube. The T8 tube works in the saturation region, and there is also a threshold voltage V TH（T8） , the gate of T8 is always charged to V Data -V TH（T8） After the shutdown, the storage voltage of Cst2 is V Data -V TH（T8） , for subsequent compensation V TH（T8） To prepare, the first light emitting diode D1 is driven by the T1 tube and is still lighting up the n+1 frame image; In the t4 time period of the n+1th frame, the Pscan2 scanning signal turns on the T14 tube, the anode potential of the second light-emitting diode D2 is initialized, and the second parasitic capacitor Clu2 of the second light-emitting diode D2 is initialized. At this time, the first light-emitting diode D1 is still driven by the T1 tube to light up the n+1th frame; In the t5 period of the n+1th frame, EM maintains a high level, T12 and T13 are turned on, T5 and T6 are turned off, the first light-emitting diode D1 stops emitting light, and the voltage of the second storage capacitor Cst2 is V Data -V TH（T8） , keep T8 on. At this time, the current flowing through the driver tube T8 is I= (1 / 2) K [ELVDD-(V Data ‐|V TH（T8） |)‐|V TH（T8） |] 2 =(1 / 2) K (ELVDD-V Data ) 2 , K is a constant, eliminating the threshold voltage V of the T8 tube TH（T8） Affected by the current I, the second light emitting diode D2 flows to make it emit light. At this time, the image data emitted is the data of the n+2th frame.

[0095] In this way, through Figure 10-2 In the working sequence shown, when one LED lights up the current frame, the symmetrical circuit will initialize the other LED in advance and write the image data of the next frame in advance. Since the light emission of the two LEDs is controlled by the complementary MOS tube, the same signal can control the two LEDs to emit light alternately in two adjacent frames. In other words, in the related art Figure 1 In the 7T1C pixel circuit shown, the light-emitting diode is turned off for at least t2+t3+t4 time when displaying each frame of image, resulting in a flicker problem; however, in the solution of the embodiment of the present application, the light-emitting module does not need to be turned off during the entire process of displaying each frame of image, and the light-emitting module is in a constantly bright state, eliminating the flicker problem.

[0096] In this way, the pixel circuit provided in the embodiment of the present application shortens or even eliminates the off time of the light-emitting module, thereby reducing or completely avoiding the flicker problem of the screen and achieving the effect of eye protection.

[0097] In addition, based on the same concept as the pixel circuit provided in any of the above embodiments, the embodiment of the present application also provides a display module.

[0098] For example, Fig.11 As shown, the display module 200 may include the pixel circuit 100 provided by any of the above embodiments, and may achieve the same functions.

[0099] In a specific embodiment, the pixel circuit 100 is Figure 9-1 As an example, the pixel circuit shown in FIG. Fig.12 As shown, the display module 200 provided in the embodiment of the present application may include: Figure 9-1 The pixel circuit 100 shown. The display module 200 may also include: a display driver chip 210, a power management chip 220, a scan driver circuit 230 and a light emitting driver circuit 240; The display driver chip 210 is connected to the scan driver circuit 230 and the light emitting driver circuit 240 respectively; The pixel circuit 100 is connected to the display driving chip 210 , the power management chip 220 , the scanning driving circuit 230 and the light emitting driving circuit 240 respectively.

[0100] The display driver chip 210 controls the output of the display data signal (Data signal), the Vint1 voltage signal, and the Vint2 voltage signal.

[0101] In addition, the display driver chip 210 further controls the scan driver circuit 230 to output a display scan signal, and the display driver chip 210 further controls the light emitting driver circuit 240 to output a light emitting control signal.

[0102] The display scan signal includes a Scan1 signal, a Scan2 signal, a Scan3 signal, a Scan4 signal, and a Pscan signal, and the light emitting control signal includes an EM_A signal and an EM_B signal.

[0103] The power management chip 220 controls the output of the first voltage V1 and the second voltage V2 , wherein the first voltage V1 may be a positive voltage and the second voltage V2 may be a negative voltage.

[0104] When the display scan signal is valid, the display data signal (Data) of the current row is written into the pixel circuit 100 , and then the light-emitting driving circuit 240 is turned on, and the power management chip 220 supplies power to the light-emitting diode D to make it emit light.

[0105] It should be pointed out that the display module can include the pixel circuit provided by any of the above embodiments and can achieve the same function. Furthermore, by shortening or even eliminating the off time of the light-emitting module, the flicker problem of the display module is reduced or completely avoided, thereby achieving the effect of eye protection.

[0106] In addition, based on the same concept as the display module provided in any of the above embodiments, an embodiment of the present application also provides an electronic device.

[0107] For example, Fig.13 As shown, the electronic device 300 may include the display module 200 provided by any of the above embodiments, and may achieve the same functions, which will not be described again here to avoid repetition.

[0108] In the embodiments of the present application, the electronic device may be a terminal or other devices other than a terminal. For example, the electronic device may be a mobile phone, a tablet computer, a laptop computer, a PDA, an in-vehicle electronic device, a mobile Internet device (MID), an augmented reality (AR) / virtual reality (VR) device, a robot, a wearable device, an ultra-mobile personal computer (UMPC), a netbook or a personal digital assistant (PDA), etc. It may also be a server, a network attached storage (NAS), a personal computer (PC), etc., which is not specifically limited in the embodiments of the present application.

[0109] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0110] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A pixel circuit, characterized in that: include: A light emitting module, a first light emitting control circuit and a second light emitting control circuit, wherein the light emitting module is connected to the first light emitting control circuit and the second light emitting control circuit respectively; Among them, the pixel circuit has a first working state and a second working state; in the first working state, the first light-emitting control circuit controls the light-emitting module to be in a light-emitting state, and the second light-emitting control circuit is in a pixel refresh state; in the second working state, the second light-emitting control circuit controls the light-emitting module to be in a light-emitting state, and the first light-emitting control circuit is in a pixel refresh state.

2. The pixel circuit according to claim 1, characterized in that: One end of the first light-emitting control circuit is connected to the first voltage end, and the other end of the first light-emitting control circuit is connected to the first end of the light-emitting module; one end of the second light-emitting control circuit is connected to the first voltage end, and the other end of the second light-emitting control circuit is connected to the first end of the light-emitting module, and the second end of the light-emitting module is connected to the second voltage end; The first light emitting control circuit comprises a first driving module, one end of the first driving module is connected to the first voltage end, and the other end of the first driving module is coupled to the first end of the light emitting module; The second light emitting control circuit includes a second driving module, one end of the second driving module is connected to the first voltage end, and the other end of the first driving module is coupled to the first end of the light emitting module.

3. The pixel circuit according to claim 2, characterized in that: The first driving module includes a first switch module, a first driving transistor and a first storage capacitor; the first end of the first storage capacitor is connected to the first voltage end, the second end of the first storage capacitor is connected to the first end of the first driving transistor, the second end of the first driving transistor is coupled to the light emitting module, the third end of the first driving transistor is coupled to the first voltage end, and the first switch module is connected to the second end or the third end of the first driving transistor; The second driving module includes a second switch module, a second driving transistor and a second storage capacitor; the first end of the second storage capacitor is connected to the first voltage end, the second end of the second storage capacitor is connected to the first end of the second driving transistor, the second end of the second driving transistor is coupled to the light emitting module, the third end of the second driving transistor is coupled to the first voltage end, and the second switch module is connected to the second end or the third end of the second driving transistor.

4. The pixel circuit according to claim 3, characterized in that: The first switch module includes a first switch tube and a second switch tube; the second end of the first driving transistor is connected to the light emitting module via the second switch tube, and the third end of the first driving transistor is connected to the first voltage end via the first switch tube.

5. The pixel circuit according to claim 4, characterized in that: The second switch module includes a third switch tube and a fourth switch tube; the second end of the second driving transistor is connected to the light emitting module via the fourth switch tube, and the third end of the second driving transistor is connected to the first voltage end via the third switch tube.

6. The pixel circuit according to claim 3, characterized in that: In the first working state, the first switch module is turned on, the first storage capacitor is in a discharging state, and the first driving transistor is turned on, so that the light-emitting module is in a light-emitting state; In the second working state, the second switch module is turned on, the second storage capacitor is in a discharging state, and the second driving transistor is turned on, so that the light-emitting module is in a light-emitting state.

7. The pixel circuit according to claim 3, characterized in that: The first light emitting control circuit further includes a fifth switch tube, the fifth switch tube having a first end, a second end and a third end, the first end of the fifth switch tube being connected to the first scanning signal end, the second end of the fifth switch tube being connected to the display data signal end, and the third end of the fifth switch tube being coupled to the second end of the first storage capacitor; The second light-emitting control circuit also includes a sixth switch tube, which has a first end, a second end and a third end. The first end of the sixth switch tube is connected to the second scan signal end, the second end of the sixth switch tube is connected to the display data signal end, and the third end of the sixth switch tube is coupled to the second end of the second storage capacitor.

8. The pixel circuit according to claim 7, characterized in that: The first light-emitting control circuit further includes a first threshold voltage compensation tube; a first end of the first threshold voltage compensation tube is connected to the first scanning signal end, a second end of the first threshold voltage compensation tube is connected to the second end of the first storage capacitor, and a third end of the first threshold voltage compensation tube is connected to the second end of the first driving transistor; a third end of the fifth switch tube is connected to the third end of the first driving transistor; The second light-emitting control circuit also includes a second threshold voltage compensation tube; the first end of the second threshold voltage compensation tube is connected to the second scanning signal end, the second end of the second threshold voltage compensation tube is connected to the second end of the second storage capacitor, and the third end of the second threshold voltage compensation tube is connected to the second end of the second driving transistor; the third end of the sixth switch tube is connected to the third end of the second driving transistor.

9. The pixel circuit according to claim 8, characterized in that: In the first working state, when the second light emitting control circuit is in a pixel refresh state, the sixth switch tube and the second threshold voltage compensation tube are turned on, and the second storage capacitor is in a charging state; In the second working state, when the first light emitting control circuit is in a pixel refresh state, the fifth switch tube and the first threshold voltage compensation tube are turned on, and the first storage capacitor is in a charging state.

10. The pixel circuit according to claim 3, characterized in that: The first light emitting control circuit further includes a first capacitor reset tube, wherein a first end of the first capacitor reset tube is connected to the third scanning signal end, a second end of the first capacitor reset tube is connected to the third voltage end, and a third end of the first capacitor reset tube is connected to the second end of the first storage capacitor; The second light-emitting control circuit also includes a second capacitor reset tube, a first end of the second capacitor reset tube is connected to the fourth scanning signal end, a second end of the second capacitor reset tube is connected to the third voltage end, and a third end of the second capacitor reset tube is connected to the second end of the second storage capacitor.

11. The pixel circuit according to claim 10, characterized in that: In the first working state, when the second light emitting control circuit is in a pixel refresh state, the second capacitor reset tube is turned on, and the second storage capacitor is in a reset state; In the second working state, when the first light emitting control circuit is in a pixel refresh state, the first capacitor reset tube is turned on, and the first storage capacitor is in a reset state.

12. The pixel circuit according to any one of claims 1 to 11, characterized in that: The light emitting module comprises a light emitting diode, one end of the light emitting diode is connected to the second voltage end, and the other end of the light emitting diode is respectively connected to the first light emitting control circuit and the second light emitting control circuit.

13. The pixel circuit according to claim 12, characterized in that: The light emitting module further comprises a parasitic capacitor connected in parallel with the light emitting diode; The pixel circuit further includes a voltage reset tube, wherein a first end of the voltage reset tube is connected to the fifth scanning signal end, a second end of the voltage reset tube is connected to the fourth voltage end, and a third end of the voltage reset tube is connected to the parasitic capacitor; The pixel circuit also has a third working state; in the third working state, the voltage reset tube is turned on and the parasitic capacitor is in a reset state.

14. The pixel circuit according to any one of claims 1 to 11, characterized in that: The light emitting module comprises a first light emitting diode and a second light emitting diode, one end of the first light emitting diode is connected to the second voltage end, the other end of the first light emitting diode is connected to the first light emitting control circuit, one end of the second light emitting diode is connected to the second voltage end, and the other end of the second light emitting diode is connected to the second light emitting control circuit; Among them, in the first working state, the first light-emitting control circuit controls the first light-emitting diode to be in a light-emitting state, and the second light-emitting control circuit is in a pixel refresh state; in the second working state, the second light-emitting control circuit controls the second light-emitting diode to be in a light-emitting state, and the first light-emitting control circuit is in a pixel refresh state.

15. The pixel circuit according to claim 14, characterized in that: The light emitting module further includes a first parasitic capacitor connected in parallel with the first light emitting diode, and a second parasitic capacitor connected in parallel with the second light emitting diode; The first light emitting control circuit further includes a first voltage reset tube, wherein a first end of the first voltage reset tube is connected to the sixth scanning signal end, a second end of the first voltage reset tube is connected to the fourth voltage end, and a third end of the first voltage reset tube is connected to the first parasitic capacitor; The second light-emitting control circuit also includes a second voltage reset tube, a first end of the second voltage reset tube is connected to the seventh scanning signal end, a second end of the second voltage reset tube is connected to the fourth voltage end, and a third end of the second voltage reset tube is connected to the second parasitic capacitor.

16. The pixel circuit according to claim 15, characterized in that: In the first working state, when the second light emitting control circuit is in a pixel refresh state, the second voltage reset tube is turned on, and the second parasitic capacitor is in a reset state; Among them, in the second working state, when the first light emitting control circuit is in a pixel refresh state, the first voltage reset tube is turned on, and the first parasitic capacitor is in a reset state.

17. The pixel circuit according to claim 14, characterized in that: In the case where the first light-emitting control circuit includes a first switch tube and a second switch tube, and the second light-emitting control circuit includes a third switch tube and a fourth switch tube, a control end of the first switch tube, a control end of the second switch tube, a control end of the third switch tube, and a control end of the fourth switch tube are connected to the same control source through the same wire; Wherein, the first switch tube and the second switch tube are P-channel metal oxide semiconductor field effect transistors PMOS, and the third switch tube and the fourth switch tube are N-channel metal oxide semiconductor field effect transistors NMOS.

18. A display module, characterized in that: Comprising a pixel circuit as described in any one of claims 1-17.

19. The display module according to claim 18, characterized in that: The display module also includes a display driver chip, a power management chip, a scan driver circuit and a light-emitting driver circuit; the display driver chip is respectively connected to the scan driver circuit and the light-emitting driver circuit; the pixel circuit is respectively connected to the display driver chip, the power management chip, the scan driver circuit and the light-emitting driver circuit.

20. An electronic device, characterized in that: Comprising a display module as described in any one of claims 18-19.

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